Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1 | /* encoding.cpp |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
| 4 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 5 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version 2 |
| 10 | * of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 20 | */ |
| 21 | |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 22 | #include <encoding.h> |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 23 | #include <gprs_rlcmac.h> |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 24 | #include <bts.h> |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 25 | #include <tbf.h> |
Pau Espin Pedrol | 9d1cdb1 | 2019-09-25 17:47:02 +0200 | [diff] [blame] | 26 | #include <tbf_ul.h> |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 27 | #include <tbf_dl.h> |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 28 | #include <gprs_debug.h> |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 29 | #include <egprs_rlc_compression.h> |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 30 | |
Tom Tsou | df69809 | 2016-07-11 17:05:19 -0700 | [diff] [blame] | 31 | extern "C" { |
| 32 | #include <osmocom/gprs/protocol/gsm_04_60.h> |
Max | d572054 | 2016-07-14 15:41:17 +0200 | [diff] [blame] | 33 | #include <osmocom/gsm/protocol/gsm_04_08.h> |
Neels Hofmeyr | 59fc0bd | 2020-08-21 16:21:23 +0200 | [diff] [blame] | 34 | #include <osmocom/gsm/gsm48.h> |
Max | 0c55bf1 | 2019-02-19 18:08:27 +0100 | [diff] [blame] | 35 | } |
Max | d572054 | 2016-07-14 15:41:17 +0200 | [diff] [blame] | 36 | |
| 37 | #include <stdbool.h> |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 38 | #include <errno.h> |
| 39 | #include <string.h> |
| 40 | |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 41 | #define CHECK(rc) { if (rc < 0) return rc; } |
| 42 | #define SET_X(bv, x) { if (bitvec_set_bit(bv, x) < 0) return -EOWNERDEAD; } |
| 43 | #define SET_0(bv) SET_X(bv, ZERO) |
| 44 | #define SET_1(bv) SET_X(bv, ONE) |
| 45 | #define SET_L(bv) SET_X(bv, L) |
| 46 | #define SET_H(bv) SET_X(bv, H) |
| 47 | |
| 48 | /* 3GPP TS 44.018 § 10.5.2.16: |
| 49 | { 0 | 1 < ALPHA : bit (4) > } |
| 50 | < GAMMA : bit (5) > |
| 51 | */ |
| 52 | static int write_alpha_gamma(bitvec *dest, uint8_t alpha, uint8_t gamma) |
| 53 | { |
| 54 | int rc; |
| 55 | |
| 56 | if (alpha) { |
| 57 | SET_1(dest); |
| 58 | rc = bitvec_set_u64(dest, alpha, 4, false); |
| 59 | CHECK(rc); |
| 60 | } else |
| 61 | SET_0(dest); |
| 62 | |
| 63 | rc = bitvec_set_u64(dest, gamma, 5, false); |
| 64 | CHECK(rc); |
| 65 | |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | /* TBF_STARTING_TIME -- same as 3GPP TS 44.018 §10.5.2.38 Starting Time without tag: */ |
| 70 | static int write_tbf_start_time(bitvec *dest, uint32_t fn) |
| 71 | { |
| 72 | int rc; |
| 73 | |
| 74 | /* Set values according to 3GPP TS 44.018 Table 10.5.2.38.1 */ |
| 75 | |
| 76 | /* T1' */ |
| 77 | rc = bitvec_set_u64(dest, (fn / (26 * 51)) % 32, 5, false); |
| 78 | CHECK(rc); |
| 79 | |
| 80 | /* T3 */ |
| 81 | rc = bitvec_set_u64(dest, fn % 51, 6, false); |
| 82 | CHECK(rc); |
| 83 | |
| 84 | /* T2 */ |
| 85 | rc = bitvec_set_u64(dest, fn % 26, 5, false); |
| 86 | CHECK(rc); |
| 87 | |
| 88 | return rc; |
| 89 | } |
| 90 | |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 91 | /* 3GPP TS 44.018 §10.5.2.16: |
| 92 | < TFI_ASSIGNMENT : bit (5) > |
| 93 | < POLLING : bit > |
| 94 | 0 -- The value '1' was allocated in an earlier version of the protocol and shall not be used. |
| 95 | < USF: bit (3) > |
| 96 | < USF_GRANULARITY : bit > |
| 97 | { 0 | 1 < P0 : bit (4) > < PR_MODE : bit (1) > } |
| 98 | */ |
| 99 | static int write_tfi_usf(bitvec *dest, const gprs_rlcmac_ul_tbf *tbf, uint8_t usf) |
| 100 | { |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 101 | int rc = bitvec_set_u64(dest, tbf->tfi(), 5, false); /* TFI_ASSIGNMENT */ |
| 102 | CHECK(rc); |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 103 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 104 | SET_0(dest); /* POLLING -- no action is required from MS */ |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 105 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 106 | SET_0(dest); |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 107 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 108 | rc = bitvec_set_u64(dest, usf, 3, false); /* USF */ |
| 109 | CHECK(rc); |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 110 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 111 | SET_0(dest); /* USF_GRANULARITY -- the mobile station shall transmit one RLC/MAC block */ |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 112 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 113 | SET_0(dest); /* No P0 nor PR_MODE */ |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 114 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 115 | return 0; |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 116 | } |
| 117 | |
Max | ae48381 | 2016-07-28 12:03:08 +0200 | [diff] [blame] | 118 | /* { 0 | 1 < TIMING_ADVANCE_INDEX : bit (4) > } */ |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 119 | static int write_ta_index(bitvec *dest, int8_t tai) |
| 120 | { |
| 121 | int rc; |
| 122 | |
Max | 02fbfc1 | 2019-03-13 15:55:54 +0100 | [diff] [blame] | 123 | if (tai < 0) { /* No TIMING_ADVANCE_INDEX: */ |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 124 | SET_0(dest); |
Max | 02fbfc1 | 2019-03-13 15:55:54 +0100 | [diff] [blame] | 125 | } else { /* TIMING_ADVANCE_INDEX: */ |
| 126 | SET_1(dest); |
| 127 | rc = bitvec_set_u64(dest, tai, 4, false); |
| 128 | CHECK(rc); |
| 129 | } |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
Max | ae48381 | 2016-07-28 12:03:08 +0200 | [diff] [blame] | 134 | static inline bool write_tai(bitvec *dest, unsigned& wp, int8_t tai) |
| 135 | { |
| 136 | if (tai < 0) { /* No TIMING_ADVANCE_INDEX: */ |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 137 | bitvec_write_field(dest, &wp, 0, 1); |
Max | ae48381 | 2016-07-28 12:03:08 +0200 | [diff] [blame] | 138 | return false; |
| 139 | } |
| 140 | /* TIMING_ADVANCE_INDEX: */ |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 141 | bitvec_write_field(dest, &wp, 1, 1); |
| 142 | bitvec_write_field(dest, &wp, tai, 4); |
Max | ae48381 | 2016-07-28 12:03:08 +0200 | [diff] [blame] | 143 | return true; |
| 144 | } |
| 145 | |
| 146 | /* { 0 | 1 < TIMING_ADVANCE_VALUE : bit (6) > } */ |
Pau Espin Pedrol | 732373d | 2020-07-07 17:20:59 +0200 | [diff] [blame] | 147 | static inline void write_ta(bitvec *dest, unsigned& wp, uint8_t ta) |
Max | ae48381 | 2016-07-28 12:03:08 +0200 | [diff] [blame] | 148 | { |
Vadim Yanitskiy | 7a1fdfd | 2020-08-20 17:26:31 +0700 | [diff] [blame] | 149 | if (ta > 63) /* No TIMING_ADVANCE_VALUE: */ |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 150 | bitvec_write_field(dest, &wp, 0, 1); |
Max | ae48381 | 2016-07-28 12:03:08 +0200 | [diff] [blame] | 151 | else { /* TIMING_ADVANCE_VALUE: */ |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 152 | bitvec_write_field(dest, &wp, 1, 1); |
| 153 | bitvec_write_field(dest, &wp, ta, 6); |
Max | ae48381 | 2016-07-28 12:03:08 +0200 | [diff] [blame] | 154 | } |
| 155 | } |
| 156 | |
Max | a4f570f | 2017-12-15 11:21:57 +0100 | [diff] [blame] | 157 | /* 3GPP TS 44.060 Table 12.5.2.1 */ |
| 158 | static inline uint16_t enc_ws(uint16_t ws) |
| 159 | { |
| 160 | return (ws - 64) / 32; |
| 161 | } |
| 162 | |
| 163 | static inline void write_ws(bitvec *dest, unsigned int *write_index, uint16_t ws) |
| 164 | { |
| 165 | dest->cur_bit = *write_index; |
| 166 | |
Vadim Yanitskiy | 9a530a2 | 2020-02-09 03:59:52 +0700 | [diff] [blame] | 167 | int rc = bitvec_set_u64(dest, enc_ws(ws), 5, false); |
| 168 | OSMO_ASSERT(rc == 0); |
Max | a4f570f | 2017-12-15 11:21:57 +0100 | [diff] [blame] | 169 | |
| 170 | *write_index += 5; |
| 171 | } |
| 172 | |
Max | ae48381 | 2016-07-28 12:03:08 +0200 | [diff] [blame] | 173 | /* 3GPP TS 44.060 § 12.12: |
| 174 | { 0 | 1 < TIMING_ADVANCE_VALUE : bit (6) > } |
| 175 | { 0 | 1 < TIMING_ADVANCE_INDEX : bit (4) > |
| 176 | < TIMING_ADVANCE_TIMESLOT_NUMBER : bit (3) > } |
| 177 | */ |
| 178 | static inline void write_ta_ie(bitvec *dest, unsigned& wp, |
Pau Espin Pedrol | 732373d | 2020-07-07 17:20:59 +0200 | [diff] [blame] | 179 | uint8_t ta, int8_t tai, uint8_t ts) |
Max | ae48381 | 2016-07-28 12:03:08 +0200 | [diff] [blame] | 180 | { |
| 181 | write_ta(dest, wp, ta); |
| 182 | if (write_tai(dest, wp, tai)) /* TIMING_ADVANCE_TIMESLOT_NUMBER: */ |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 183 | bitvec_write_field(dest, &wp, ts, 3); |
Max | ae48381 | 2016-07-28 12:03:08 +0200 | [diff] [blame] | 184 | } |
| 185 | |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 186 | static int write_ia_rest_downlink(const gprs_rlcmac_dl_tbf *tbf, bitvec * dest, bool polling, bool ta_valid, |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 187 | uint32_t fn, uint8_t alpha, uint8_t gamma, int8_t ta_idx) |
Jacob Erlbeck | 18831c3 | 2016-02-01 15:23:35 +0100 | [diff] [blame] | 188 | { |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 189 | int rc = 0; |
| 190 | |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 191 | SET_H(dest); SET_H(dest); |
| 192 | SET_0(dest); SET_1(dest); /* 00 Packet Downlink Assignment */ |
| 193 | |
| 194 | rc = bitvec_set_u64(dest, tbf->tlli(), 32, false); /* TLLI */ |
| 195 | CHECK(rc); |
| 196 | |
| 197 | SET_1(dest); |
| 198 | rc = bitvec_set_u64(dest, tbf->tfi(), 5, false); /* TFI_ASSIGNMENT */ |
| 199 | CHECK(rc); |
| 200 | |
| 201 | /* RLC acknowledged mode */ |
Vadim Yanitskiy | 3f2022e | 2020-05-23 19:23:56 +0700 | [diff] [blame] | 202 | rc = bitvec_set_bit(dest, (bit_value) RLC_MODE_ACKNOWLEDGED); |
| 203 | CHECK(rc); |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 204 | |
| 205 | rc = write_alpha_gamma(dest, alpha, gamma); |
| 206 | CHECK(rc); |
| 207 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 208 | rc = bitvec_set_bit(dest, (bit_value) polling); /* POLLING */ |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 209 | CHECK(rc); |
| 210 | |
| 211 | /* N. B: NOT related to TAI! */ |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 212 | rc = bitvec_set_bit(dest, (bit_value) ta_valid); /* TA_VALID */ |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 213 | CHECK(rc); |
| 214 | |
| 215 | rc = write_ta_index(dest, ta_idx); |
| 216 | CHECK(rc); |
| 217 | |
Jacob Erlbeck | 18831c3 | 2016-02-01 15:23:35 +0100 | [diff] [blame] | 218 | if (polling) { |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 219 | SET_1(dest); |
| 220 | rc = write_tbf_start_time(dest, fn); |
| 221 | CHECK(rc); |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 222 | } else |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 223 | SET_0(dest); |
| 224 | |
| 225 | SET_0(dest); /* No P0 nor PR_MODE */ |
| 226 | |
Jacob Erlbeck | be80c36 | 2016-02-01 16:39:52 +0100 | [diff] [blame] | 227 | if (tbf->is_egprs_enabled()) { |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 228 | SET_H(dest); |
| 229 | rc = bitvec_set_u64(dest, enc_ws(tbf->window_size()), 5, false); /* EGPRS Window Size */ |
| 230 | CHECK(rc); |
| 231 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 232 | /* The mobile station shall not report measurements: (see 3GPP TS 44.060 Table 11.2.7.1) */ |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 233 | SET_0(dest); SET_0(dest); /* LINK_QUALITY_MEASUREMENT_MODE */ |
| 234 | SET_1(dest); /* No BEP_PERIOD2 */ |
| 235 | } else |
| 236 | SET_L(dest); /* No Additions for Rel-6 */ |
Jacob Erlbeck | 2647a33 | 2016-02-01 16:13:38 +0100 | [diff] [blame] | 237 | |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 238 | return rc; |
Jacob Erlbeck | 18831c3 | 2016-02-01 15:23:35 +0100 | [diff] [blame] | 239 | } |
| 240 | |
Max | 3eb4736 | 2019-02-19 18:41:22 +0100 | [diff] [blame] | 241 | /* 3GPP TS 44.018 Table 10.5.2.16.1 < Packet Uplink Assignment > -- Single Block Allocation */ |
| 242 | static int write_ia_rest_uplink_sba(bitvec *dest, uint32_t fn, uint8_t alpha, uint8_t gamma) |
Jacob Erlbeck | 18831c3 | 2016-02-01 15:23:35 +0100 | [diff] [blame] | 243 | { |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 244 | int rc = 0; |
Jacob Erlbeck | be80c36 | 2016-02-01 16:39:52 +0100 | [diff] [blame] | 245 | |
Max | 3eb4736 | 2019-02-19 18:41:22 +0100 | [diff] [blame] | 246 | SET_0(dest); /* Single Block Allocation */ |
| 247 | rc = write_alpha_gamma(dest, alpha, gamma); |
| 248 | CHECK(rc); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 249 | |
Max | 3eb4736 | 2019-02-19 18:41:22 +0100 | [diff] [blame] | 250 | /* A 'Timing Advance index' shall not be allocated at a Single Block allocation. |
| 251 | A 'TBF Starting Time' shall be allocated at a Single Block allocation. */ |
| 252 | SET_0(dest); |
| 253 | SET_1(dest); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 254 | |
Max | 3eb4736 | 2019-02-19 18:41:22 +0100 | [diff] [blame] | 255 | rc = write_tbf_start_time(dest, fn); |
| 256 | CHECK(rc); |
| 257 | |
| 258 | /* No P0 nor PR_MODE */ |
| 259 | SET_L(dest); |
| 260 | |
| 261 | /* No Additions for R99 */ |
| 262 | SET_L(dest); |
| 263 | |
| 264 | /* No Additions for Rel-6 */ |
| 265 | SET_L(dest); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 266 | |
| 267 | return rc; |
Jacob Erlbeck | 18831c3 | 2016-02-01 15:23:35 +0100 | [diff] [blame] | 268 | } |
| 269 | |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 270 | static int write_ia_rest_uplink_mba(const gprs_rlcmac_ul_tbf *tbf, bitvec *dest, uint8_t usf, |
Max | e742cc0 | 2019-03-12 18:42:09 +0100 | [diff] [blame] | 271 | uint8_t alpha, uint8_t gamma, int8_t ta_idx) |
Jacob Erlbeck | be80c36 | 2016-02-01 16:39:52 +0100 | [diff] [blame] | 272 | { |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 273 | int rc = 0; |
bhargava | 465f5bb | 2016-09-02 16:50:43 +0530 | [diff] [blame] | 274 | |
Max | 0367ddd | 2019-03-12 18:31:54 +0100 | [diff] [blame] | 275 | SET_1(dest); /* Multi Block Allocation */ |
bhargava | 465f5bb | 2016-09-02 16:50:43 +0530 | [diff] [blame] | 276 | |
Max | 0367ddd | 2019-03-12 18:31:54 +0100 | [diff] [blame] | 277 | rc = write_tfi_usf(dest, tbf, usf); |
| 278 | CHECK(rc); |
bhargava | 465f5bb | 2016-09-02 16:50:43 +0530 | [diff] [blame] | 279 | |
Max | 0367ddd | 2019-03-12 18:31:54 +0100 | [diff] [blame] | 280 | /* 3GPP TS 44.060 Table 11.2.28.2 Channel Coding Indicator */ |
| 281 | rc = bitvec_set_u64(dest, mcs_chan_code(tbf->current_cs()), 2, false); /* CHANNEL_CODING_COMMAND */ |
| 282 | CHECK(rc); |
| 283 | |
| 284 | /* TLLI_BLOCK_CHANNEL_CODING */ |
| 285 | SET_1(dest); /* use coding scheme as specified by the corresponding CHANNEL CODING COMMAND */ |
| 286 | |
| 287 | rc = write_alpha_gamma(dest, alpha, gamma); |
| 288 | CHECK(rc); |
| 289 | |
Max | e742cc0 | 2019-03-12 18:42:09 +0100 | [diff] [blame] | 290 | rc = write_ta_index(dest, ta_idx); |
| 291 | CHECK(rc); |
Max | 0367ddd | 2019-03-12 18:31:54 +0100 | [diff] [blame] | 292 | |
| 293 | /* No TBF_STARTING_TIME */ |
| 294 | SET_0(dest); |
bhargava | 465f5bb | 2016-09-02 16:50:43 +0530 | [diff] [blame] | 295 | |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 296 | return rc; |
| 297 | } |
bhargava | 465f5bb | 2016-09-02 16:50:43 +0530 | [diff] [blame] | 298 | |
Max | bd5647e | 2019-02-19 18:10:12 +0100 | [diff] [blame] | 299 | static int write_ia_rest_egprs_uplink_mba(bitvec * dest, uint32_t fn, uint8_t alpha, uint8_t gamma) |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 300 | { |
| 301 | int rc = 0; |
bhargava | 465f5bb | 2016-09-02 16:50:43 +0530 | [diff] [blame] | 302 | |
Max | bd5647e | 2019-02-19 18:10:12 +0100 | [diff] [blame] | 303 | SET_0(dest); /* Multi Block Allocation */ |
bhargava | 465f5bb | 2016-09-02 16:50:43 +0530 | [diff] [blame] | 304 | |
Max | bd5647e | 2019-02-19 18:10:12 +0100 | [diff] [blame] | 305 | rc = write_alpha_gamma(dest, alpha, gamma); |
| 306 | CHECK(rc); |
bhargava | 465f5bb | 2016-09-02 16:50:43 +0530 | [diff] [blame] | 307 | |
Max | bd5647e | 2019-02-19 18:10:12 +0100 | [diff] [blame] | 308 | rc = write_tbf_start_time(dest, fn); |
| 309 | CHECK(rc); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 310 | |
Max | bd5647e | 2019-02-19 18:10:12 +0100 | [diff] [blame] | 311 | SET_0(dest); /* NUMBER OF RADIO BLOCKS ALLOCATED: */ |
| 312 | SET_0(dest); /* 1 radio block reserved for uplink transmission */ |
| 313 | SET_0(dest); /* No P0 */ |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 314 | |
| 315 | return rc; |
| 316 | } |
| 317 | |
| 318 | static int write_ia_rest_egprs_uplink_sba(const gprs_rlcmac_ul_tbf *tbf, bitvec * dest, uint8_t usf, |
Max | e742cc0 | 2019-03-12 18:42:09 +0100 | [diff] [blame] | 319 | uint8_t alpha, uint8_t gamma, int8_t ta_idx) |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 320 | { |
| 321 | int rc = 0; |
| 322 | |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 323 | SET_1(dest); /* Single Block Allocation */ |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 324 | |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 325 | rc = write_tfi_usf(dest, tbf, usf); |
| 326 | CHECK(rc); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 327 | |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 328 | /* 3GPP TS 44.060 §12.10d EGPRS Modulation and coding Scheme description: */ |
Max | 6e96dd4 | 2019-03-06 18:17:32 +0100 | [diff] [blame] | 329 | rc = bitvec_set_u64(dest, mcs_chan_code(tbf->current_cs()), 4, false); /* EGPRS CHANNEL_CODING_COMMAND */ |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 330 | CHECK(rc); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 331 | |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 332 | /* TLLI_BLOCK_CHANNEL_CODING */ |
| 333 | rc = bitvec_set_bit(dest, (bit_value)tbf->tlli()); |
Vadim Yanitskiy | 4c593c8 | 2020-05-24 02:01:28 +0700 | [diff] [blame] | 334 | CHECK(rc); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 335 | |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 336 | /* No BEP_PERIOD2 */ |
| 337 | SET_0(dest); |
| 338 | |
| 339 | /* Retransmitted RLC data blocks shall not be re-segmented: (see 3GPP TS 44.060 §12.10e) */ |
| 340 | SET_0(dest); /* RESEGMENT */ |
| 341 | |
| 342 | rc = bitvec_set_u64(dest, enc_ws(tbf->window_size()), 5, false); /* EGPRS Window Size */ |
| 343 | CHECK(rc); |
| 344 | |
| 345 | rc = write_alpha_gamma(dest, alpha, gamma); |
| 346 | CHECK(rc); |
| 347 | |
Max | e742cc0 | 2019-03-12 18:42:09 +0100 | [diff] [blame] | 348 | rc = write_ta_index(dest, ta_idx); |
| 349 | CHECK(rc); |
Max | 2a47c73 | 2019-02-19 18:25:13 +0100 | [diff] [blame] | 350 | |
| 351 | /* No TBF_STARTING_TIME */ |
| 352 | SET_0(dest); |
| 353 | |
| 354 | /* No Additions for Rel-7 */ |
| 355 | SET_0(dest); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 356 | |
| 357 | return rc; |
Jacob Erlbeck | be80c36 | 2016-02-01 16:39:52 +0100 | [diff] [blame] | 358 | } |
| 359 | |
Jacob Erlbeck | 18831c3 | 2016-02-01 15:23:35 +0100 | [diff] [blame] | 360 | /* |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 361 | * Immediate assignment reject, sent on the CCCH/AGCH |
| 362 | * see GSM 44.018, 9.1.20 + 10.5.2.30 |
| 363 | */ |
Pau Espin Pedrol | 25ebf3c | 2021-04-26 13:36:16 +0200 | [diff] [blame] | 364 | int Encoding::write_immediate_assignment_reject(bitvec *dest, uint16_t ra, |
| 365 | uint32_t ref_fn, enum ph_burst_type burst_type, uint8_t t3142) |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 366 | { |
| 367 | unsigned wp = 0; |
| 368 | int plen; |
| 369 | int i; |
| 370 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 371 | bitvec_write_field(dest, &wp, 0x0, 4); // Skip Indicator |
| 372 | bitvec_write_field(dest, &wp, 0x6, 4); // Protocol Discriminator |
| 373 | bitvec_write_field(dest, &wp, 0x3A, 8); // Immediate Assign Message Type |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 374 | |
| 375 | // feature indicator |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 376 | bitvec_write_field(dest, &wp, 0x0, 1); // spare |
| 377 | bitvec_write_field(dest, &wp, 0x0, 1); // spare |
| 378 | bitvec_write_field(dest, &wp, 0x0, 1); // no cs |
| 379 | bitvec_write_field(dest, &wp, 0x1, 1); // implicit detach for PS |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 380 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 381 | bitvec_write_field(dest, &wp, 0x0, 4); // Page Mode |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 382 | /* |
| 383 | * 9.1.20.2 of 44.018 version 11.7.0 Release 11 |
| 384 | * Filling of the message |
| 385 | * If necessary the request reference information element and the |
| 386 | * wait indication information element should be duplicated to |
| 387 | * fill the message. |
| 388 | * TODO: group rejection for multiple MS |
| 389 | */ |
| 390 | for (i = 0; i < 4; i++) { |
| 391 | //10.5.2.30 Request Reference |
| 392 | if (((burst_type == GSM_L1_BURST_TYPE_ACCESS_1) || |
| 393 | (burst_type == GSM_L1_BURST_TYPE_ACCESS_2))) { |
| 394 | //9.1.20.2a of 44.018 version 11.7.0 Release 11 |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 395 | bitvec_write_field(dest, &wp, 0x7f, 8); /* RACH value */ |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 396 | } else { |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 397 | bitvec_write_field(dest, &wp, ra, 8); /* RACH value */ |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 398 | } |
| 399 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 400 | bitvec_write_field(dest, &wp, |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 401 | (ref_fn / (26 * 51)) % 32, 5); // T1' |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 402 | bitvec_write_field(dest, &wp, ref_fn % 51, 6); // T3 |
| 403 | bitvec_write_field(dest, &wp, ref_fn % 26, 5); // T2 |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 404 | |
Pau Espin Pedrol | 25ebf3c | 2021-04-26 13:36:16 +0200 | [diff] [blame] | 405 | /* 10.5.2.43 Wait Indication */ |
| 406 | bitvec_write_field(dest, &wp, t3142, 8); |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 407 | } |
| 408 | |
| 409 | plen = wp / 8; |
| 410 | |
| 411 | if ((wp % 8)) { |
| 412 | LOGP(DRLCMACUL, LOGL_ERROR, "Length of IMM.ASS.Rej without" |
| 413 | "rest octets is not multiple of 8 bits, PLEASE FIX!\n"); |
| 414 | return -1; |
| 415 | } |
| 416 | |
| 417 | // Extended RA |
| 418 | else if (((burst_type == GSM_L1_BURST_TYPE_ACCESS_1) || |
| 419 | (burst_type == GSM_L1_BURST_TYPE_ACCESS_2))) { |
| 420 | //9.1.20.2a of 44.018 version 11.7.0 Release 11 |
| 421 | uint8_t extended_ra = 0; |
| 422 | |
| 423 | extended_ra = (ra & 0x1F); |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 424 | bitvec_write_field(dest, &wp, 0x1, 1); |
| 425 | bitvec_write_field(dest, &wp, extended_ra, 5); /* Extended RA */ |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 426 | } else { |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 427 | bitvec_write_field(dest, &wp, 0x0, 1); |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 428 | } |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 429 | bitvec_write_field(dest, &wp, 0x0, 1); |
| 430 | bitvec_write_field(dest, &wp, 0x0, 1); |
| 431 | bitvec_write_field(dest, &wp, 0x0, 1); |
aravind sirsikar | c0c3afd | 2016-11-09 16:27:00 +0530 | [diff] [blame] | 432 | |
| 433 | return plen; |
| 434 | } |
| 435 | |
| 436 | /* |
Jacob Erlbeck | 18831c3 | 2016-02-01 15:23:35 +0100 | [diff] [blame] | 437 | * Immediate assignment, sent on the CCCH/AGCH |
| 438 | * see GSM 04.08, 9.1.18 and GSM 44.018, 9.1.18 + 10.5.2.16 |
| 439 | */ |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 440 | int Encoding::write_immediate_assignment( |
Vadim Yanitskiy | 1156776 | 2020-07-18 23:34:17 +0700 | [diff] [blame] | 441 | const struct gprs_rlcmac_pdch *pdch, |
Jacob Erlbeck | 2647a33 | 2016-02-01 16:13:38 +0100 | [diff] [blame] | 442 | struct gprs_rlcmac_tbf *tbf, |
Max | fc8afc2 | 2019-02-18 18:52:38 +0100 | [diff] [blame] | 443 | bitvec * dest, bool downlink, uint16_t ra, |
Vadim Yanitskiy | 1156776 | 2020-07-18 23:34:17 +0700 | [diff] [blame] | 444 | uint32_t ref_fn, uint8_t ta, |
Max | fc8afc2 | 2019-02-18 18:52:38 +0100 | [diff] [blame] | 445 | uint8_t usf, bool polling, uint32_t fn, uint8_t alpha, |
| 446 | uint8_t gamma, int8_t ta_idx, enum ph_burst_type burst_type) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 447 | { |
| 448 | unsigned wp = 0; |
Jacob Erlbeck | 2647a33 | 2016-02-01 16:13:38 +0100 | [diff] [blame] | 449 | int plen; |
| 450 | int rc; |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 451 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 452 | bitvec_write_field(dest, &wp,0x0,4); // Skip Indicator |
| 453 | bitvec_write_field(dest, &wp,0x6,4); // Protocol Discriminator |
| 454 | bitvec_write_field(dest, &wp,0x3F,8); // Immediate Assignment Message Type |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 455 | |
| 456 | // 10.5.2.25b Dedicated mode or TBF |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 457 | bitvec_write_field(dest, &wp,0x0,1); // spare |
| 458 | bitvec_write_field(dest, &wp,0x0,1); // TMA : Two-message assignment: No meaning |
| 459 | bitvec_write_field(dest, &wp,downlink,1); // Downlink : Downlink assignment to mobile in packet idle mode |
| 460 | bitvec_write_field(dest, &wp,0x1,1); // T/D : TBF or dedicated mode: this message assigns a Temporary Block Flow (TBF). |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 461 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 462 | bitvec_write_field(dest, &wp,0x0,4); // Page Mode |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 463 | |
| 464 | // GSM 04.08 10.5.2.25a Packet Channel Description |
Vadim Yanitskiy | 1156776 | 2020-07-18 23:34:17 +0700 | [diff] [blame] | 465 | bitvec_write_field(dest, &wp, 0x01, 5); // Channel type |
| 466 | bitvec_write_field(dest, &wp, pdch->ts_no, 3); // TN |
| 467 | bitvec_write_field(dest, &wp, pdch->tsc, 3); // TSC |
| 468 | |
Vadim Yanitskiy | 542e388 | 2020-07-19 00:47:20 +0700 | [diff] [blame] | 469 | /* RF channel configuraion: hopping or non-hopping */ |
| 470 | if (pdch->fh.enabled) { |
| 471 | bitvec_write_field(dest, &wp, 0x01, 1); /* direct encoding */ |
| 472 | bitvec_write_field(dest, &wp, pdch->fh.maio, 6); |
| 473 | bitvec_write_field(dest, &wp, pdch->fh.hsn, 6); |
| 474 | } else { |
| 475 | bitvec_write_field(dest, &wp, 0x00, 3); |
| 476 | bitvec_write_field(dest, &wp, pdch->trx->arfcn, 10); |
| 477 | } |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 478 | |
| 479 | //10.5.2.30 Request Reference |
bhargava | 465f5bb | 2016-09-02 16:50:43 +0530 | [diff] [blame] | 480 | if (((burst_type == GSM_L1_BURST_TYPE_ACCESS_1) || |
| 481 | (burst_type == GSM_L1_BURST_TYPE_ACCESS_2))) { |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 482 | bitvec_write_field(dest, &wp, 0x7f, 8); /* RACH value */ |
bhargava | 465f5bb | 2016-09-02 16:50:43 +0530 | [diff] [blame] | 483 | } else { |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 484 | bitvec_write_field(dest, &wp, ra, 8); /* RACH value */ |
bhargava | 465f5bb | 2016-09-02 16:50:43 +0530 | [diff] [blame] | 485 | } |
| 486 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 487 | bitvec_write_field(dest, &wp,(ref_fn / (26 * 51)) % 32,5); // T1' |
| 488 | bitvec_write_field(dest, &wp,ref_fn % 51,6); // T3 |
| 489 | bitvec_write_field(dest, &wp,ref_fn % 26,5); // T2 |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 490 | |
| 491 | // 10.5.2.40 Timing Advance |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 492 | bitvec_write_field(dest, &wp,0x0,2); // spare |
| 493 | bitvec_write_field(dest, &wp,ta,6); // Timing Advance value |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 494 | |
Vadim Yanitskiy | 542e388 | 2020-07-19 00:47:20 +0700 | [diff] [blame] | 495 | /* 10.5.2.21 Mobile Allocation */ |
| 496 | if (pdch->fh.enabled) { |
| 497 | bitvec_write_field(dest, &wp, pdch->fh.ma_oct_len, 8); |
| 498 | for (int i = 0; i < pdch->fh.ma_oct_len; i++) |
| 499 | bitvec_write_field(dest, &wp, pdch->fh.ma[i], 8); |
| 500 | } else { |
| 501 | // No mobile allocation in non-hopping systems. |
| 502 | // A zero-length LV. Just write L=0. |
| 503 | bitvec_write_field(dest, &wp, 0x00, 8); |
| 504 | } |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 505 | |
Vadim Yanitskiy | 8f628ab | 2020-07-18 20:47:47 +0700 | [diff] [blame] | 506 | OSMO_ASSERT(wp % 8 == 0); |
Max | 0a8fae8 | 2017-03-08 18:53:30 +0100 | [diff] [blame] | 507 | |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 508 | plen = wp / 8; |
| 509 | |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 510 | /* 3GPP TS 44.018 §10.5.2.16 IA Rest Octets */ |
Max | 3fa235f | 2019-03-13 19:08:02 +0100 | [diff] [blame] | 511 | dest->cur_bit = wp; |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 512 | if (downlink) { |
Vadim Yanitskiy | 9d5a115 | 2020-07-18 20:54:22 +0700 | [diff] [blame] | 513 | OSMO_ASSERT(as_dl_tbf(tbf) != NULL); |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 514 | |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 515 | rc = write_ia_rest_downlink(as_dl_tbf(tbf), dest, polling, gsm48_ta_is_valid(ta), fn, alpha, gamma, |
Max | 23c0e01 | 2019-02-19 17:49:27 +0100 | [diff] [blame] | 516 | ta_idx); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 517 | } else if (((burst_type == GSM_L1_BURST_TYPE_ACCESS_1) || (burst_type == GSM_L1_BURST_TYPE_ACCESS_2))) { |
Max | 3fa235f | 2019-03-13 19:08:02 +0100 | [diff] [blame] | 518 | SET_L(dest); SET_H(dest); // "LH" |
| 519 | SET_0(dest); SET_0(dest); // "00" < EGPRS Packet Uplink Assignment > |
| 520 | rc = bitvec_set_u64(dest, ra & 0x1F, 5, false); // < Extended RA > |
| 521 | CHECK(rc); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 522 | |
Max | 3fa235f | 2019-03-13 19:08:02 +0100 | [diff] [blame] | 523 | SET_0(dest); // No < Access Technologies Request struct > |
| 524 | |
| 525 | if (as_ul_tbf(tbf) != NULL) |
Max | e742cc0 | 2019-03-12 18:42:09 +0100 | [diff] [blame] | 526 | rc = write_ia_rest_egprs_uplink_sba(as_ul_tbf(tbf), dest, usf, alpha, gamma, ta_idx); |
Max | 3fa235f | 2019-03-13 19:08:02 +0100 | [diff] [blame] | 527 | else |
Max | bd5647e | 2019-02-19 18:10:12 +0100 | [diff] [blame] | 528 | rc = write_ia_rest_egprs_uplink_mba(dest, fn, alpha, gamma); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 529 | } else { |
| 530 | OSMO_ASSERT(!tbf || !tbf->is_egprs_enabled()); |
| 531 | |
Max | 3fa235f | 2019-03-13 19:08:02 +0100 | [diff] [blame] | 532 | SET_H(dest); SET_H(dest); // "HH" |
| 533 | SET_0(dest); SET_0(dest); // "00" < Packet Uplink Assignment > |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 534 | |
Max | 3fa235f | 2019-03-13 19:08:02 +0100 | [diff] [blame] | 535 | if (as_ul_tbf(tbf) != NULL) |
Max | e742cc0 | 2019-03-12 18:42:09 +0100 | [diff] [blame] | 536 | rc = write_ia_rest_uplink_mba(as_ul_tbf(tbf), dest, usf, alpha, gamma, ta_idx); |
Max | 3fa235f | 2019-03-13 19:08:02 +0100 | [diff] [blame] | 537 | else |
Max | 3eb4736 | 2019-02-19 18:41:22 +0100 | [diff] [blame] | 538 | rc = write_ia_rest_uplink_sba(dest, fn, alpha, gamma); |
Max | 0160a29 | 2019-02-19 15:37:03 +0100 | [diff] [blame] | 539 | } |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 540 | |
Jacob Erlbeck | 2647a33 | 2016-02-01 16:13:38 +0100 | [diff] [blame] | 541 | if (rc < 0) { |
| 542 | LOGP(DRLCMAC, LOGL_ERROR, |
Thorsten Alteholz | 8bb7904 | 2018-10-06 10:42:58 +0200 | [diff] [blame] | 543 | "Failed to create IMMEDIATE ASSIGNMENT (%s) for %s\n", |
Jacob Erlbeck | 2647a33 | 2016-02-01 16:13:38 +0100 | [diff] [blame] | 544 | downlink ? "downlink" : "uplink", |
| 545 | tbf ? tbf->name() : "single block allocation"); |
| 546 | return rc; |
| 547 | } |
| 548 | |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 549 | return plen; |
| 550 | } |
| 551 | |
Vadim Yanitskiy | 542e388 | 2020-07-19 00:47:20 +0700 | [diff] [blame] | 552 | /* Prepare to be encoded Frequency Parameters IE (see Table 12.8.1) */ |
| 553 | static void gen_freq_params(Frequency_Parameters_t *freq_params, |
| 554 | const struct gprs_rlcmac_tbf *tbf) |
| 555 | { |
| 556 | const struct gprs_rlcmac_pdch *pdch; |
| 557 | Direct_encoding_1_t fh_params; |
| 558 | |
| 559 | /* Check one PDCH, if it's hopping then all other should too */ |
| 560 | pdch = tbf->pdch[tbf->first_ts]; |
| 561 | OSMO_ASSERT(pdch != NULL); |
| 562 | |
| 563 | /* Training Sequence Code */ |
| 564 | freq_params->TSC = pdch->tsc; |
| 565 | |
| 566 | /* If frequency hopping is not in use, encode a single ARFCN */ |
Vadim Yanitskiy | 2597cf1 | 2020-09-10 18:20:32 +0700 | [diff] [blame] | 567 | if (!pdch->fh.enabled) { |
Vadim Yanitskiy | 542e388 | 2020-07-19 00:47:20 +0700 | [diff] [blame] | 568 | freq_params->UnionType = 0x00; |
| 569 | freq_params->u.ARFCN = tbf->trx->arfcn; |
| 570 | return; |
| 571 | } |
| 572 | |
| 573 | /* Direct encoding 1 (see Table 12.8.1) */ |
| 574 | freq_params->UnionType = 0x2; |
| 575 | |
| 576 | /* HSN / MAIO */ |
| 577 | fh_params.MAIO = pdch->fh.maio; |
| 578 | fh_params.GPRS_Mobile_Allocation.HSN = pdch->fh.hsn; |
| 579 | fh_params.GPRS_Mobile_Allocation.ElementsOf_RFL_NUMBER = 0; |
| 580 | |
| 581 | /* Mobile Allocation bitmap */ |
| 582 | fh_params.GPRS_Mobile_Allocation.UnionType = 0; /* MA bitmap */ |
| 583 | fh_params.GPRS_Mobile_Allocation.u.MA.MA_LENGTH = pdch->fh.ma_oct_len; /* in bytes */ |
| 584 | fh_params.GPRS_Mobile_Allocation.u.MA.MA_BitLength = pdch->fh.ma_bit_len; /* in bits */ |
| 585 | memcpy(fh_params.GPRS_Mobile_Allocation.u.MA.MA_BITMAP, pdch->fh.ma, pdch->fh.ma_oct_len); |
| 586 | |
| 587 | freq_params->u.Direct_encoding_1 = fh_params; |
| 588 | } |
| 589 | |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 590 | /* Generate Packet Uplink Assignment as per 3GPP TS 44.060, section 11.2.29. |
| 591 | * NOTE: 'block' is expected to be zero-initialized by the caller. */ |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 592 | void Encoding::write_packet_uplink_assignment( |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 593 | RlcMacDownlink_t * block, uint8_t old_tfi, |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 594 | uint8_t old_downlink, uint32_t tlli, uint8_t use_tlli, |
Vadim Yanitskiy | c0ddaa9 | 2020-08-20 16:49:34 +0700 | [diff] [blame] | 595 | const struct gprs_rlcmac_ul_tbf *tbf, uint8_t poll, uint8_t rrbp, uint8_t alpha, |
Vadim Yanitskiy | a76cdac | 2020-08-22 00:12:30 +0700 | [diff] [blame] | 596 | uint8_t gamma, int8_t ta_idx, bool use_egprs) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 597 | { |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 598 | Packet_Uplink_Assignment_t *pua; |
| 599 | Packet_Timing_Advance_t *pta; |
| 600 | Frequency_Parameters_t *fp; |
| 601 | Dynamic_Allocation_t *da; |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 602 | |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 603 | /* RLC/MAC control block without the optional RLC/MAC control header */ |
| 604 | block->PAYLOAD_TYPE = 0x01; // Payload Type |
| 605 | block->RRBP = rrbp; // RRBP (e.g. N+13) |
| 606 | block->SP = poll; // RRBP field is valid |
| 607 | block->USF = 0x00; // Uplink state flag |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 608 | |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 609 | /* See 3GPP TS 44.060, section 11.2.29 */ |
| 610 | pua = &block->u.Packet_Uplink_Assignment; |
| 611 | pua->MESSAGE_TYPE = 0x0a; // Packet Uplink Assignment |
| 612 | pua->PAGE_MODE = 0x00; // Normal Paging |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 613 | |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 614 | /* TLLI or Global (UL/DL) TFI */ |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 615 | if (use_tlli) { |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 616 | pua->ID.UnionType = 0x01; |
| 617 | pua->ID.u.TLLI = tlli; |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 618 | } else { |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 619 | pua->ID.UnionType = 0x00; |
| 620 | pua->ID.u.Global_TFI.UnionType = old_downlink; |
| 621 | pua->ID.u.Global_TFI.u.UPLINK_TFI = old_tfi; |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 622 | } |
| 623 | |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 624 | /* GPRS/EGPRS specific parameters */ |
| 625 | pua->UnionType = use_egprs ? 0x01 : 0x00; |
Jacob Erlbeck | 76d767c | 2015-09-28 18:54:32 +0200 | [diff] [blame] | 626 | if (!use_egprs) { |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 627 | PUA_GPRS_t *gprs = &pua->u.PUA_GPRS_Struct; |
| 628 | |
Pau Espin Pedrol | 7963edb | 2021-01-25 14:39:12 +0100 | [diff] [blame] | 629 | /* Use the commanded CS/MCS value during the content resolution */ |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 630 | gprs->CHANNEL_CODING_COMMAND = mcs_chan_code(tbf->current_cs()); |
| 631 | gprs->TLLI_BLOCK_CHANNEL_CODING = 0x01; // ^^^ |
| 632 | |
| 633 | /* Dynamic allocation */ |
| 634 | gprs->UnionType = 0x01; |
| 635 | /* Frequency Parameters IE is present */ |
| 636 | gprs->Exist_Frequency_Parameters = 0x01; |
| 637 | |
| 638 | /* Common parameters to be set below */ |
| 639 | pta = &gprs->Packet_Timing_Advance; |
| 640 | fp = &gprs->Frequency_Parameters; |
| 641 | da = &gprs->u.Dynamic_Allocation; |
| 642 | } else { |
| 643 | PUA_EGPRS_00_t *egprs = &pua->u.PUA_EGPRS_Struct.u.PUA_EGPRS_00; |
| 644 | pua->u.PUA_EGPRS_Struct.UnionType = 0x00; // 'Normal' EGPRS, not EGPRS2 |
| 645 | |
Pau Espin Pedrol | 7963edb | 2021-01-25 14:39:12 +0100 | [diff] [blame] | 646 | /* Use the commanded CS/MCS value during the content resolution */ |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 647 | egprs->EGPRS_CHANNEL_CODING_COMMAND = mcs_chan_code(tbf->current_cs()); |
| 648 | egprs->TLLI_BLOCK_CHANNEL_CODING = 0x01; // ^^^ |
| 649 | egprs->RESEGMENT = 0x01; // Enable segmentation |
| 650 | egprs->EGPRS_WindowSize = tbf->window_size(); |
| 651 | |
| 652 | /* Dynamic allocation */ |
| 653 | egprs->UnionType = 0x01; |
| 654 | /* Frequency Parameters IE is present */ |
| 655 | egprs->Exist_Frequency_Parameters = 0x01; |
| 656 | |
| 657 | /* Common parameters to be set below */ |
| 658 | pta = &egprs->Packet_Timing_Advance; |
| 659 | fp = &egprs->Frequency_Parameters; |
| 660 | da = &egprs->u.Dynamic_Allocation; |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 661 | } |
| 662 | |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 663 | /* Packet Timing Advance (if known) */ |
Pau Espin Pedrol | 6bab522 | 2021-05-11 13:01:53 +0200 | [diff] [blame] | 664 | if (gsm48_ta_is_valid(tbf->ta())) { /* { 0 | 1 < TIMING_ADVANCE_VALUE : bit (6) > } */ |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 665 | pta->Exist_TIMING_ADVANCE_VALUE = 0x01; // Present |
| 666 | pta->TIMING_ADVANCE_VALUE = tbf->ta(); |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 667 | } |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 668 | |
| 669 | /* Continuous Timing Advance Control */ |
| 670 | if (ta_idx >= 0 && ta_idx < 16) { |
| 671 | pta->Exist_IndexAndtimeSlot = 0x01; // Present |
| 672 | pta->TIMING_ADVANCE_TIMESLOT_NUMBER = 0; // FIXME! |
| 673 | pta->TIMING_ADVANCE_INDEX = ta_idx; |
| 674 | } |
| 675 | |
| 676 | /* Frequency Parameters IE */ |
Vadim Yanitskiy | 542e388 | 2020-07-19 00:47:20 +0700 | [diff] [blame] | 677 | gen_freq_params(fp, tbf); |
Vadim Yanitskiy | db56a35 | 2020-08-22 02:05:28 +0700 | [diff] [blame] | 678 | |
| 679 | /* Dynamic allocation parameters */ |
| 680 | da->USF_GRANULARITY = 0x00; |
| 681 | |
| 682 | /* Assign an Uplink TFI */ |
| 683 | da->Exist_UPLINK_TFI_ASSIGNMENT = 0x01; |
| 684 | da->UPLINK_TFI_ASSIGNMENT = tbf->tfi(); |
| 685 | |
| 686 | /* Timeslot Allocation with or without Power Control */ |
| 687 | da->UnionType = (alpha || gamma) ? 0x01 : 0x00; |
| 688 | if (da->UnionType == 0x01) |
| 689 | da->u.Timeslot_Allocation_Power_Ctrl_Param.ALPHA = alpha; |
| 690 | |
| 691 | for (unsigned int tn = 0; tn < 8; tn++) { |
| 692 | if (tbf->pdch[tn] == NULL) |
| 693 | continue; |
| 694 | |
| 695 | if (da->UnionType == 0x01) { |
| 696 | Timeslot_Allocation_Power_Ctrl_Param_t *params = \ |
| 697 | &da->u.Timeslot_Allocation_Power_Ctrl_Param; |
| 698 | params->Slot[tn].Exist = 0x01; // Enable this timeslot |
| 699 | params->Slot[tn].USF_TN = tbf->m_usf[tn]; // USF_TN(i) |
| 700 | params->Slot[tn].GAMMA_TN = gamma; |
| 701 | } else { |
| 702 | Timeslot_Allocation_t *slot = &da->u.Timeslot_Allocation[tn]; |
| 703 | slot->Exist = 0x01; // Enable this timeslot |
| 704 | slot->USF_TN = tbf->m_usf[tn]; // USF_TN(i) |
| 705 | } |
| 706 | } |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 707 | } |
| 708 | |
| 709 | |
Vadim Yanitskiy | 962d717 | 2020-09-08 02:46:05 +0700 | [diff] [blame] | 710 | /* Generate Packet Downlink Assignment as per 3GPP TS 44.060, section 11.2.7. |
| 711 | * NOTE: 'block' is expected to be zero-initialized by the caller. */ |
Jacob Erlbeck | 166c9fc | 2016-01-07 16:04:29 +0100 | [diff] [blame] | 712 | void Encoding::write_packet_downlink_assignment(RlcMacDownlink_t * block, |
Jacob Erlbeck | 6b356a5 | 2016-01-29 16:39:21 +0100 | [diff] [blame] | 713 | bool old_tfi_is_valid, uint8_t old_tfi, uint8_t old_downlink, |
Vadim Yanitskiy | c0ddaa9 | 2020-08-20 16:49:34 +0700 | [diff] [blame] | 714 | const struct gprs_rlcmac_dl_tbf *tbf, uint8_t poll, uint8_t rrbp, |
Jacob Erlbeck | 6b356a5 | 2016-01-29 16:39:21 +0100 | [diff] [blame] | 715 | uint8_t alpha, uint8_t gamma, int8_t ta_idx, |
Jacob Erlbeck | f2694b7 | 2016-01-26 21:46:26 +0100 | [diff] [blame] | 716 | uint8_t ta_ts, bool use_egprs) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 717 | { |
Jacob Erlbeck | 166c9fc | 2016-01-07 16:04:29 +0100 | [diff] [blame] | 718 | PDA_AdditionsR99_t *pda_r99; |
| 719 | |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 720 | uint8_t tn; |
| 721 | |
| 722 | block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header |
Jacob Erlbeck | f2694b7 | 2016-01-26 21:46:26 +0100 | [diff] [blame] | 723 | block->RRBP = rrbp; // 0: N+13 |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 724 | block->SP = poll; // RRBP field is valid |
| 725 | block->USF = 0x0; // Uplink state flag |
| 726 | |
| 727 | block->u.Packet_Downlink_Assignment.MESSAGE_TYPE = 0x2; // Packet Downlink Assignment |
| 728 | block->u.Packet_Downlink_Assignment.PAGE_MODE = 0x0; // Normal Paging |
| 729 | |
| 730 | block->u.Packet_Downlink_Assignment.Exist_PERSISTENCE_LEVEL = 0x0; // PERSISTENCE_LEVEL: off |
| 731 | |
Jacob Erlbeck | 6b356a5 | 2016-01-29 16:39:21 +0100 | [diff] [blame] | 732 | if (old_tfi_is_valid) { |
| 733 | block->u.Packet_Downlink_Assignment.ID.UnionType = 0x0; // TFI = on |
| 734 | block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.UnionType = old_downlink; // 0=UPLINK TFI, 1=DL TFI |
| 735 | block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.u.UPLINK_TFI = old_tfi; // TFI |
| 736 | } else { |
| 737 | block->u.Packet_Downlink_Assignment.ID.UnionType = 0x1; // TLLI |
| 738 | block->u.Packet_Downlink_Assignment.ID.u.TLLI = tbf->tlli(); |
| 739 | } |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 740 | |
| 741 | block->u.Packet_Downlink_Assignment.MAC_MODE = 0x0; // Dynamic Allocation |
Vadim Yanitskiy | 3f2022e | 2020-05-23 19:23:56 +0700 | [diff] [blame] | 742 | block->u.Packet_Downlink_Assignment.RLC_MODE = RLC_MODE_ACKNOWLEDGED; |
Daniel Willmann | 73191a4 | 2014-05-30 17:58:00 +0200 | [diff] [blame] | 743 | block->u.Packet_Downlink_Assignment.CONTROL_ACK = tbf->was_releasing; // NW establishes no new DL TBF for the MS with running timer T3192 |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 744 | block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION = 0; // timeslot(s) |
| 745 | for (tn = 0; tn < 8; tn++) { |
| 746 | if (tbf->pdch[tn]) |
| 747 | block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION |= 0x80 >> tn; // timeslot(s) |
| 748 | } |
| 749 | |
Vadim Yanitskiy | 7a1fdfd | 2020-08-20 17:26:31 +0700 | [diff] [blame] | 750 | if (tbf->ta() > 63) { /* { 0 | 1 < TIMING_ADVANCE_VALUE : bit (6) > } */ |
| 751 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_TIMING_ADVANCE_VALUE = 0x0; // TIMING_ADVANCE_VALUE = off |
| 752 | } else { |
| 753 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_TIMING_ADVANCE_VALUE = 0x1; // TIMING_ADVANCE_VALUE = on |
| 754 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_VALUE = tbf->ta(); // TIMING_ADVANCE_VALUE |
| 755 | } |
| 756 | |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 757 | if (ta_idx < 0) { |
| 758 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x0; // TIMING_ADVANCE_INDEX = off |
| 759 | } else { |
| 760 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x1; // TIMING_ADVANCE_INDEX = on |
| 761 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_INDEX = ta_idx; // TIMING_ADVANCE_INDEX |
| 762 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_TIMESLOT_NUMBER = ta_ts; // TIMING_ADVANCE_TS |
| 763 | } |
| 764 | |
| 765 | block->u.Packet_Downlink_Assignment.Exist_P0_and_BTS_PWR_CTRL_MODE = 0x0; // POWER CONTROL = off |
| 766 | |
| 767 | block->u.Packet_Downlink_Assignment.Exist_Frequency_Parameters = 0x1; // Frequency Parameters = on |
Vadim Yanitskiy | 542e388 | 2020-07-19 00:47:20 +0700 | [diff] [blame] | 768 | gen_freq_params(&block->u.Packet_Downlink_Assignment.Frequency_Parameters, tbf); |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 769 | |
| 770 | block->u.Packet_Downlink_Assignment.Exist_DOWNLINK_TFI_ASSIGNMENT = 0x1; // DOWNLINK TFI ASSIGNMENT = on |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 771 | block->u.Packet_Downlink_Assignment.DOWNLINK_TFI_ASSIGNMENT = tbf->tfi(); // TFI |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 772 | |
| 773 | block->u.Packet_Downlink_Assignment.Exist_Power_Control_Parameters = 0x1; // Power Control Parameters = on |
| 774 | block->u.Packet_Downlink_Assignment.Power_Control_Parameters.ALPHA = alpha; // ALPHA |
| 775 | |
| 776 | for (tn = 0; tn < 8; tn++) |
| 777 | { |
| 778 | if (tbf->pdch[tn]) |
| 779 | { |
| 780 | block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x1; // Slot[i] = on |
| 781 | block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].GAMMA_TN = gamma; // GAMMA_TN |
| 782 | } |
| 783 | else |
| 784 | { |
| 785 | block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x0; // Slot[i] = off |
| 786 | } |
| 787 | } |
| 788 | |
| 789 | block->u.Packet_Downlink_Assignment.Exist_TBF_Starting_Time = 0x0; // TBF Starting TIME = off |
| 790 | block->u.Packet_Downlink_Assignment.Exist_Measurement_Mapping = 0x0; // Measurement_Mapping = off |
Jacob Erlbeck | 166c9fc | 2016-01-07 16:04:29 +0100 | [diff] [blame] | 791 | if (!use_egprs) { |
| 792 | block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off |
| 793 | return; |
| 794 | } |
Jacob Erlbeck | 36df774 | 2016-01-19 15:53:30 +0100 | [diff] [blame] | 795 | |
Jacob Erlbeck | 166c9fc | 2016-01-07 16:04:29 +0100 | [diff] [blame] | 796 | block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x1; // AdditionsR99 = on |
| 797 | pda_r99 = &block->u.Packet_Downlink_Assignment.AdditionsR99; |
| 798 | pda_r99->Exist_EGPRS_Params = 1; |
Max | a4f570f | 2017-12-15 11:21:57 +0100 | [diff] [blame] | 799 | pda_r99->EGPRS_WindowSize = enc_ws(tbf->window_size()); /* see TS 44.060, table 12.5.2.1 */ |
Jacob Erlbeck | 166c9fc | 2016-01-07 16:04:29 +0100 | [diff] [blame] | 800 | pda_r99->LINK_QUALITY_MEASUREMENT_MODE = 0x0; /* no meas, see TS 44.060, table 11.2.7.2 */ |
| 801 | pda_r99->Exist_BEP_PERIOD2 = 0; /* No extra EGPRS BEP PERIOD */ |
| 802 | pda_r99->Exist_Packet_Extended_Timing_Advance = 0; |
| 803 | pda_r99->Exist_COMPACT_ReducedMA = 0; |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 804 | } |
| 805 | |
Stefan Sperling | 513c9bc | 2018-05-02 14:53:16 +0200 | [diff] [blame] | 806 | /* Generate paging request. See 44.018, sections 10 and 9.1.22 */ |
Neels Hofmeyr | 59fc0bd | 2020-08-21 16:21:23 +0200 | [diff] [blame] | 807 | int Encoding::write_paging_request(bitvec * dest, const struct osmo_mobile_identity *mi) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 808 | { |
Neels Hofmeyr | 59fc0bd | 2020-08-21 16:21:23 +0200 | [diff] [blame] | 809 | uint8_t mi_buf[GSM48_MID_MAX_SIZE]; |
| 810 | int mi_len; |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 811 | unsigned wp = 0; |
| 812 | int plen; |
| 813 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 814 | bitvec_write_field(dest, &wp,0x0,4); // Skip Indicator |
| 815 | bitvec_write_field(dest, &wp,0x6,4); // Protocol Discriminator |
Stefan Sperling | 513c9bc | 2018-05-02 14:53:16 +0200 | [diff] [blame] | 816 | bitvec_write_field(dest, &wp,0x21,8); // Paging Request Message Type 1 |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 817 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 818 | bitvec_write_field(dest, &wp,0x0,4); // Page Mode |
| 819 | bitvec_write_field(dest, &wp,0x0,4); // Channel Needed |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 820 | |
Neels Hofmeyr | 59fc0bd | 2020-08-21 16:21:23 +0200 | [diff] [blame] | 821 | mi_len = osmo_mobile_identity_encode_buf(mi_buf, sizeof(mi_buf), mi, true); |
| 822 | if (mi_len <= 0) |
| 823 | return mi_len; |
Pau Espin Pedrol | 5530f12 | 2019-12-10 19:26:27 +0100 | [diff] [blame] | 824 | bitvec_write_field(dest, &wp, mi_len, 8); // Mobile Identity length |
Neels Hofmeyr | 59fc0bd | 2020-08-21 16:21:23 +0200 | [diff] [blame] | 825 | bitvec_set_bytes(dest, mi_buf, mi_len); // Mobile Identity |
Pau Espin Pedrol | 5530f12 | 2019-12-10 19:26:27 +0100 | [diff] [blame] | 826 | wp += mi_len * 8; |
Max | 0a8fae8 | 2017-03-08 18:53:30 +0100 | [diff] [blame] | 827 | |
Vadim Yanitskiy | 8f628ab | 2020-07-18 20:47:47 +0700 | [diff] [blame] | 828 | OSMO_ASSERT(wp % 8 == 0); |
Max | 0a8fae8 | 2017-03-08 18:53:30 +0100 | [diff] [blame] | 829 | |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 830 | plen = wp / 8; |
Stefan Sperling | 513c9bc | 2018-05-02 14:53:16 +0200 | [diff] [blame] | 831 | bitvec_write_field(dest, &wp,0x0,1); // "L" Notification List Number; NLN(PCH) = off |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 832 | bitvec_write_field(dest, &wp,0x0,1); // "L" Priority1 = off |
| 833 | bitvec_write_field(dest, &wp,0x1,1); // "L" Priority2 = off |
| 834 | bitvec_write_field(dest, &wp,0x0,1); // "L" Group Call information = off |
| 835 | bitvec_write_field(dest, &wp,0x0,1); // "H" Packet Page Indication 1 = packet paging procedure |
| 836 | bitvec_write_field(dest, &wp,0x1,1); // "H" Packet Page Indication 2 = packet paging procedure |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 837 | |
| 838 | return plen; |
| 839 | } |
| 840 | |
Daniel Willmann | 5241c1a | 2013-12-11 14:35:29 +0100 | [diff] [blame] | 841 | /** |
| 842 | * The index of the array show_rbb is the bit position inside the rbb |
| 843 | * (show_rbb[63] relates to BSN ssn-1) |
| 844 | */ |
| 845 | void Encoding::encode_rbb(const char *show_rbb, uint8_t *rbb) |
| 846 | { |
| 847 | uint8_t rbb_byte = 0; |
| 848 | |
| 849 | // RECEIVE_BLOCK_BITMAP |
| 850 | for (int i = 0; i < 64; i++) { |
Pau Espin Pedrol | 05be903 | 2021-02-01 13:06:45 +0100 | [diff] [blame] | 851 | /* Set bit at the appropriate position (see 3GPP TS 44.060 9.1.8.1) */ |
Daniel Willmann | 5241c1a | 2013-12-11 14:35:29 +0100 | [diff] [blame] | 852 | if (show_rbb[i] == 'R') |
| 853 | rbb_byte |= 1<< (7-(i%8)); |
| 854 | |
Pau Espin Pedrol | 16705a4 | 2020-10-27 10:24:57 +0100 | [diff] [blame] | 855 | if ((i%8) == 7) { |
Daniel Willmann | 5241c1a | 2013-12-11 14:35:29 +0100 | [diff] [blame] | 856 | rbb[i/8] = rbb_byte; |
| 857 | rbb_byte = 0; |
| 858 | } |
| 859 | } |
| 860 | } |
| 861 | |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 862 | static void write_packet_ack_nack_desc_gprs( |
Alexander Couzens | 3a499f3 | 2019-06-16 15:25:30 +0200 | [diff] [blame] | 863 | bitvec * dest, unsigned& wp, |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 864 | gprs_rlc_ul_window *window, bool is_final) |
| 865 | { |
| 866 | char rbb[65]; |
| 867 | |
| 868 | window->update_rbb(rbb); |
| 869 | |
| 870 | rbb[64] = 0; |
| 871 | LOGP(DRLCMACUL, LOGL_DEBUG, "- V(N): \"%s\" R=Received " |
| 872 | "I=Invalid\n", rbb); |
| 873 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 874 | bitvec_write_field(dest, &wp, is_final, 1); // FINAL_ACK_INDICATION |
| 875 | bitvec_write_field(dest, &wp, window->ssn(), 7); // STARTING_SEQUENCE_NUMBER |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 876 | |
| 877 | for (int i = 0; i < 64; i++) { |
Pau Espin Pedrol | 05be903 | 2021-02-01 13:06:45 +0100 | [diff] [blame] | 878 | /* Set bit at the appropriate position (see 3GPP TS 44.060 9.1.8.1) */ |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 879 | bool is_ack = (rbb[i] == 'R'); |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 880 | bitvec_write_field(dest, &wp, is_ack, 1); |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 881 | } |
| 882 | } |
| 883 | |
| 884 | static void write_packet_uplink_ack_gprs( |
Alexander Couzens | 3a499f3 | 2019-06-16 15:25:30 +0200 | [diff] [blame] | 885 | bitvec * dest, unsigned& wp, |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 886 | struct gprs_rlcmac_ul_tbf *tbf, bool is_final) |
| 887 | { |
Pau Espin Pedrol | b3f2397 | 2020-10-23 21:00:23 +0200 | [diff] [blame] | 888 | gprs_rlc_ul_window *window = static_cast<gprs_rlc_ul_window *>(tbf->window()); |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 889 | |
Max | 6e96dd4 | 2019-03-06 18:17:32 +0100 | [diff] [blame] | 890 | bitvec_write_field(dest, &wp, mcs_chan_code(tbf->current_cs()), 2); // CHANNEL_CODING_COMMAND |
Pau Espin Pedrol | b3f2397 | 2020-10-23 21:00:23 +0200 | [diff] [blame] | 891 | write_packet_ack_nack_desc_gprs(dest, wp, window, is_final); |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 892 | |
Pau Espin Pedrol | eb13c79 | 2021-05-11 12:52:41 +0200 | [diff] [blame] | 893 | if (tbf->is_tlli_valid()) { |
| 894 | bitvec_write_field(dest, &wp, 1, 1); // 1: have CONTENTION_RESOLUTION_TLLI |
| 895 | bitvec_write_field(dest, &wp, tbf->tlli(), 32); // CONTENTION_RESOLUTION_TLLI |
| 896 | } else { |
| 897 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have CONTENTION_RESOLUTION_TLLI |
| 898 | } |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 899 | |
Pau Espin Pedrol | c432e06 | 2021-05-11 13:17:31 +0200 | [diff] [blame] | 900 | if (gsm48_ta_is_valid(tbf->ta())) { |
| 901 | bitvec_write_field(dest, &wp, 1, 1); // 1: have Packet Timing Advance IE (TS 44.060 12.12) |
| 902 | bitvec_write_field(dest, &wp, 1, 1); // 1: have TIMING_ADVANCE_VALUE |
| 903 | bitvec_write_field(dest, &wp, tbf->ta(), 6); // TIMING_ADVANCE_VALUE |
| 904 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have TIMING_ADVANCE_INDEX |
| 905 | } else { |
| 906 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have Packet Timing Advance |
| 907 | } |
| 908 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 909 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have Power Control Parameters |
| 910 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have Extension Bits |
| 911 | bitvec_write_field(dest, &wp, 0, 1); // fixed 0 |
| 912 | bitvec_write_field(dest, &wp, 1, 1); // 1: have Additions R99 |
| 913 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have Packet Extended Timing Advance |
| 914 | bitvec_write_field(dest, &wp, 1, 1); // TBF_EST (enabled) |
| 915 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have REL 5 |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 916 | }; |
| 917 | |
Alexander Couzens | 210ccf4 | 2019-06-16 17:05:40 +0200 | [diff] [blame] | 918 | /* Encode the Ack/Nack for EGPRS. 44.060 |
| 919 | * The PCU encodes to receive block bitmap to the following rules: |
| 920 | * - always encode the lenght field |
| 921 | * - use compressed receive block bitmap if it's smaller than uncompressed |
| 922 | * receive block bitmap |
| 923 | * - use the remaining bits for an uncompressed receive block bitmap if needed |
| 924 | * |
| 925 | * Note: The spec also defines an Ack/Nack without length field, but the PCU's |
| 926 | * doesn't support this in UL. It would require a lot more code complexity |
| 927 | * and only saves 7 bit in lossy sitations. |
| 928 | */ |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 929 | static void write_packet_ack_nack_desc_egprs( |
Alexander Couzens | 3a499f3 | 2019-06-16 15:25:30 +0200 | [diff] [blame] | 930 | bitvec * dest, unsigned& wp, |
Alexander Couzens | 243a204 | 2019-06-16 21:53:03 +0200 | [diff] [blame] | 931 | gprs_rlc_ul_window *window, bool is_final, unsigned rest_bits) |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 932 | { |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 933 | unsigned int urbb_len = 0; |
| 934 | uint8_t crbb_len = 0; |
| 935 | uint8_t len; |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 936 | bool bow = true; |
| 937 | bool eow = true; |
Alexander Couzens | e4e70d0 | 2019-06-16 16:20:10 +0200 | [diff] [blame] | 938 | uint16_t ssn = window->mod_sns(window->v_q() + 1); |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 939 | unsigned int num_blocks = window->mod_sns(window->v_r() - window->v_q()); |
Alexander Couzens | e4e70d0 | 2019-06-16 16:20:10 +0200 | [diff] [blame] | 940 | uint16_t esn_crbb = window->mod_sns(ssn - 1); |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 941 | static uint8_t rbb[RLC_EGPRS_MAX_WS] = {'\0'}; |
| 942 | uint8_t iter = 0; |
Pravin Kumarvel | 06bdb35 | 2016-10-24 12:21:21 +0530 | [diff] [blame] | 943 | int is_compressed = 0; |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 944 | bool try_compression = false; |
Alexander Couzens | e4e70d0 | 2019-06-16 16:20:10 +0200 | [diff] [blame] | 945 | uint16_t ucmp_bmplen; |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 946 | uint8_t crbb_bitmap[23] = {'\0'}; |
| 947 | bitvec ucmp_vec; |
| 948 | bitvec crbb_vec; |
| 949 | uint8_t uclen_crbb = 0; |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 950 | uint8_t crbb_start_clr_code; |
Pravin Kumarvel | 06bdb35 | 2016-10-24 12:21:21 +0530 | [diff] [blame] | 951 | uint8_t i; |
Alexander Couzens | b7439f2 | 2019-06-16 15:16:30 +0200 | [diff] [blame] | 952 | |
| 953 | /* static size of 16 bits |
Alexander Couzens | 210ccf4 | 2019-06-16 17:05:40 +0200 | [diff] [blame] | 954 | ..1. .... = ACKNACK: (Union) |
| 955 | 0 0000 000 Length |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 956 | Desc |
Pau Espin Pedrol | 585cfb2 | 2019-12-10 17:09:51 +0100 | [diff] [blame] | 957 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 958 | ...0 .... = FINAL_ACK_INDICATION: False |
Pau Espin Pedrol | 585cfb2 | 2019-12-10 17:09:51 +0100 | [diff] [blame] | 959 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 960 | .... 1... = BEGINNING_OF_WINDOW: 1 |
Pau Espin Pedrol | 585cfb2 | 2019-12-10 17:09:51 +0100 | [diff] [blame] | 961 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 962 | .... .1.. = END_OF_WINDOW: 1 |
Pau Espin Pedrol | 585cfb2 | 2019-12-10 17:09:51 +0100 | [diff] [blame] | 963 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 964 | .... ..10 0101 0001 1... .... = STARTING_SEQUENCE_NUMBER: 1187 |
Pau Espin Pedrol | 585cfb2 | 2019-12-10 17:09:51 +0100 | [diff] [blame] | 965 | |
Alexander Couzens | 210ccf4 | 2019-06-16 17:05:40 +0200 | [diff] [blame] | 966 | .0.. .... = CRBB Exist: 0 |
| 967 | minimal size is 24 rest_bits */ |
| 968 | rest_bits -= 24; |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 969 | |
| 970 | if (num_blocks > 0) |
| 971 | /* V(Q) is NACK and omitted -> SSN = V(Q) + 1 */ |
| 972 | num_blocks -= 1; |
| 973 | |
| 974 | if (num_blocks > window->ws()) |
| 975 | num_blocks = window->ws(); |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 976 | /* Try Compression as number of blocks does not fit */ |
| 977 | if (num_blocks > rest_bits) { |
| 978 | try_compression = true; |
| 979 | } |
| 980 | if (try_compression == true) { |
| 981 | ucmp_bmplen = window->update_egprs_rbb(rbb); |
| 982 | ucmp_vec.data = rbb; |
| 983 | ucmp_vec.cur_bit = ucmp_bmplen; |
| 984 | ucmp_vec.data_len = 127; |
| 985 | crbb_vec.data = crbb_bitmap; |
| 986 | crbb_vec.cur_bit = 0; |
| 987 | crbb_vec.data_len = 127; |
| 988 | LOGP(DRLCMACUL, LOGL_DEBUG, |
| 989 | "rest_bits=%d uncompressed len %d and uncompressed bitmap = %s\n", |
| 990 | rest_bits, ucmp_bmplen, |
| 991 | osmo_hexdump(ucmp_vec.data, (ucmp_bmplen+7)/8)); |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 992 | |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 993 | is_compressed = egprs_compress::compress_rbb(&ucmp_vec, /* Uncompressed bitmap*/ |
| 994 | &crbb_vec, /*Compressed bitmap vector */ |
| 995 | &uclen_crbb, |
| 996 | (rest_bits - 16));/* CRBBlength:7 colourcode:1 dissector length:8*/ |
| 997 | LOGP(DRLCMACUL, LOGL_DEBUG, |
| 998 | "the ucmp len=%d uclen_crbb=%d num_blocks=%d crbb length %d, " |
| 999 | "and the CRBB bitmap = %s\n", |
| 1000 | ucmp_bmplen, uclen_crbb, num_blocks, crbb_vec.cur_bit, |
| 1001 | osmo_hexdump(crbb_bitmap, (crbb_vec.cur_bit+7)/8)); |
| 1002 | crbb_len = crbb_vec.cur_bit; |
| 1003 | } |
| 1004 | |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 1005 | |
Alexander Couzens | 210ccf4 | 2019-06-16 17:05:40 +0200 | [diff] [blame] | 1006 | if (is_compressed) { |
| 1007 | /* 8 = 7 (CRBBlength) + 1 (CRBB starting color code) */ |
| 1008 | rest_bits -= 8; |
Pravin Kumarvel | 06bdb35 | 2016-10-24 12:21:21 +0530 | [diff] [blame] | 1009 | } else { |
Alexander Couzens | 210ccf4 | 2019-06-16 17:05:40 +0200 | [diff] [blame] | 1010 | uclen_crbb = 0; |
| 1011 | crbb_len = 0; |
| 1012 | } |
| 1013 | |
| 1014 | if (num_blocks > uclen_crbb + rest_bits) { |
| 1015 | eow = false; |
| 1016 | urbb_len = rest_bits - crbb_len; |
| 1017 | } else |
| 1018 | urbb_len = num_blocks - uclen_crbb; |
| 1019 | |
| 1020 | if (is_compressed) |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 1021 | len = urbb_len + crbb_len + 23; |
Alexander Couzens | 210ccf4 | 2019-06-16 17:05:40 +0200 | [diff] [blame] | 1022 | else |
| 1023 | len = urbb_len + 15; |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1024 | |
Alexander Couzens | 210ccf4 | 2019-06-16 17:05:40 +0200 | [diff] [blame] | 1025 | |
| 1026 | /* EGPRS Ack/Nack Description IE |
| 1027 | * do not support Ack/Nack without length */ |
| 1028 | bitvec_write_field(dest, &wp, 1, 1); // 1: have length |
| 1029 | bitvec_write_field(dest, &wp, len, 8); // length |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1030 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1031 | bitvec_write_field(dest, &wp, is_final, 1); // FINAL_ACK_INDICATION |
| 1032 | bitvec_write_field(dest, &wp, bow, 1); // BEGINNING_OF_WINDOW |
| 1033 | bitvec_write_field(dest, &wp, eow, 1); // END_OF_WINDOW |
| 1034 | bitvec_write_field(dest, &wp, ssn, 11); // STARTING_SEQUENCE_NUMBER |
Pravin Kumarvel | 06bdb35 | 2016-10-24 12:21:21 +0530 | [diff] [blame] | 1035 | if (is_compressed) { |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1036 | bitvec_write_field(dest, &wp, 1, 1); // CRBB_Exist |
| 1037 | bitvec_write_field(dest, &wp, crbb_len, 7); // CRBB_LENGTH |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 1038 | crbb_start_clr_code = (0x80 & ucmp_vec.data[0])>>7; |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1039 | bitvec_write_field(dest, &wp, crbb_start_clr_code, 1); // CRBB_clr_code |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 1040 | LOGP(DRLCMACUL, LOGL_DEBUG, |
| 1041 | "EGPRS CRBB, crbb_len = %d, crbb_start_clr_code = %d\n", |
| 1042 | crbb_len, crbb_start_clr_code); |
| 1043 | while (crbb_len != 0) { |
| 1044 | if (crbb_len > 8) { |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1045 | bitvec_write_field(dest, &wp, crbb_bitmap[iter], 8); |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 1046 | crbb_len = crbb_len - 8; |
| 1047 | iter++; |
| 1048 | } else { |
Alexander Couzens | 3f64077 | 2019-05-31 17:19:53 +0200 | [diff] [blame] | 1049 | bitvec_write_field(dest, &wp, crbb_bitmap[iter] >> (8 - crbb_len), crbb_len); |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 1050 | crbb_len = 0; |
| 1051 | } |
| 1052 | } |
| 1053 | esn_crbb = window->mod_sns(esn_crbb + uclen_crbb); |
| 1054 | } else { |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1055 | bitvec_write_field(dest, &wp, 0, 1); // CRBB_Exist |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 1056 | } |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1057 | LOGP(DRLCMACUL, LOGL_DEBUG, |
Alexander Couzens | e4e70d0 | 2019-06-16 16:20:10 +0200 | [diff] [blame] | 1058 | "EGPRS URBB, urbb len = %d, SSN = %u, ESN_CRBB = %u, " |
Alexander Couzens | 210ccf4 | 2019-06-16 17:05:40 +0200 | [diff] [blame] | 1059 | "desc len = %d, " |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1060 | "SNS = %d, WS = %d, V(Q) = %d, V(R) = %d%s%s\n", |
Alexander Couzens | 210ccf4 | 2019-06-16 17:05:40 +0200 | [diff] [blame] | 1061 | urbb_len, ssn, esn_crbb, len, |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1062 | window->sns(), window->ws(), window->v_q(), window->v_r(), |
| 1063 | bow ? ", BOW" : "", eow ? ", EOW" : ""); |
Pravin Kumarvel | 06bdb35 | 2016-10-24 12:21:21 +0530 | [diff] [blame] | 1064 | |
| 1065 | for (i = urbb_len; i > 0; i--) { |
Pau Espin Pedrol | 05be903 | 2021-02-01 13:06:45 +0100 | [diff] [blame] | 1066 | /* Set bit at the appropriate position (see 3GPP TS 44.060 12.3.1) */ |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1067 | bool is_ack = window->m_v_n.is_received(esn_crbb + i); |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1068 | bitvec_write_field(dest, &wp, is_ack, 1); |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1069 | } |
| 1070 | } |
| 1071 | |
| 1072 | static void write_packet_uplink_ack_egprs( |
Alexander Couzens | 3a499f3 | 2019-06-16 15:25:30 +0200 | [diff] [blame] | 1073 | bitvec * dest, unsigned& wp, |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1074 | struct gprs_rlcmac_ul_tbf *tbf, bool is_final) |
| 1075 | { |
Pau Espin Pedrol | b3f2397 | 2020-10-23 21:00:23 +0200 | [diff] [blame] | 1076 | gprs_rlc_ul_window *window = static_cast<gprs_rlc_ul_window *>(tbf->window()); |
| 1077 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1078 | bitvec_write_field(dest, &wp, 0, 2); // fixed 00 |
Aravind Sirsikar | 99ab0a8 | 2016-06-15 17:46:41 +0530 | [diff] [blame] | 1079 | /* CHANNEL_CODING_COMMAND */ |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1080 | bitvec_write_field(dest, &wp, |
Max | 6e96dd4 | 2019-03-06 18:17:32 +0100 | [diff] [blame] | 1081 | mcs_chan_code(tbf->current_cs()), 4); |
Aravind Sirsikar | 505a86d | 2016-07-26 18:26:21 +0530 | [diff] [blame] | 1082 | /* 0: no RESEGMENT, 1: Segmentation*/ |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1083 | bitvec_write_field(dest, &wp, 1, 1); |
| 1084 | bitvec_write_field(dest, &wp, 1, 1); // PRE_EMPTIVE_TRANSMISSION, TODO: This resembles GPRS, change it? |
| 1085 | bitvec_write_field(dest, &wp, 0, 1); // 0: no PRR_RETRANSMISSION_REQUEST, TODO: clarify |
| 1086 | bitvec_write_field(dest, &wp, 0, 1); // 0: no ARAC_RETRANSMISSION_REQUEST, TODO: clarify |
Pau Espin Pedrol | eb13c79 | 2021-05-11 12:52:41 +0200 | [diff] [blame] | 1087 | |
| 1088 | if (tbf->is_tlli_valid()) { |
| 1089 | bitvec_write_field(dest, &wp, 1, 1); // 1: have CONTENTION_RESOLUTION_TLLI |
| 1090 | bitvec_write_field(dest, &wp, tbf->tlli(), 32); // CONTENTION_RESOLUTION_TLLI |
| 1091 | } else { |
| 1092 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have CONTENTION_RESOLUTION_TLLI |
| 1093 | } |
| 1094 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1095 | bitvec_write_field(dest, &wp, 1, 1); // TBF_EST (enabled) |
Pau Espin Pedrol | c432e06 | 2021-05-11 13:17:31 +0200 | [diff] [blame] | 1096 | |
| 1097 | if (gsm48_ta_is_valid(tbf->ta())) { |
| 1098 | bitvec_write_field(dest, &wp, 1, 1); // 1: have Packet Timing Advance IE (TS 44.060 12.12) |
| 1099 | bitvec_write_field(dest, &wp, 1, 1); // 1: have TIMING_ADVANCE_VALUE |
| 1100 | bitvec_write_field(dest, &wp, tbf->ta(), 6); // TIMING_ADVANCE_VALUE |
| 1101 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have TIMING_ADVANCE_INDEX |
| 1102 | } else { |
| 1103 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have Packet Timing Advance |
| 1104 | } |
| 1105 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1106 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have Packet Extended Timing Advance |
| 1107 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have Power Control Parameters |
| 1108 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have Extension Bits |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1109 | |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 1110 | /* -2 for last bit 0 mandatory and REL5 not supported */ |
| 1111 | unsigned bits_ack_nack = dest->data_len * 8 - wp - 2; |
Pau Espin Pedrol | b3f2397 | 2020-10-23 21:00:23 +0200 | [diff] [blame] | 1112 | write_packet_ack_nack_desc_egprs(dest, wp, window, is_final, bits_ack_nack); |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1113 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1114 | bitvec_write_field(dest, &wp, 0, 1); // fixed 0 |
| 1115 | bitvec_write_field(dest, &wp, 0, 1); // 0: don't have REL 5 |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1116 | }; |
| 1117 | |
| 1118 | void Encoding::write_packet_uplink_ack( |
Alexander Couzens | 3a499f3 | 2019-06-16 15:25:30 +0200 | [diff] [blame] | 1119 | bitvec * dest, struct gprs_rlcmac_ul_tbf *tbf, bool is_final, |
Jacob Erlbeck | f2694b7 | 2016-01-26 21:46:26 +0100 | [diff] [blame] | 1120 | uint8_t rrbp) |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1121 | { |
| 1122 | unsigned wp = 0; |
| 1123 | |
| 1124 | LOGP(DRLCMACUL, LOGL_DEBUG, "Encoding Ack/Nack for %s " |
| 1125 | "(final=%d)\n", tbf_name(tbf), is_final); |
| 1126 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1127 | bitvec_write_field(dest, &wp, 0x1, 2); // Payload Type |
| 1128 | bitvec_write_field(dest, &wp, rrbp, 2); // Uplink block with TDMA framenumber |
| 1129 | bitvec_write_field(dest, &wp, is_final, 1); // Suppl/Polling Bit |
| 1130 | bitvec_write_field(dest, &wp, 0x0, 3); // Uplink state flag |
| 1131 | bitvec_write_field(dest, &wp, 0x9, 6); // MESSAGE TYPE Uplink Ack/Nack |
| 1132 | bitvec_write_field(dest, &wp, 0x0, 2); // Page Mode |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1133 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1134 | bitvec_write_field(dest, &wp, 0x0, 2); // fixed 00 |
| 1135 | bitvec_write_field(dest, &wp, tbf->tfi(), 5); // Uplink TFI |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1136 | |
| 1137 | if (tbf->is_egprs_enabled()) { |
| 1138 | /* PU_AckNack_EGPRS = on */ |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1139 | bitvec_write_field(dest, &wp, 1, 1); // 1: EGPRS |
Alexander Couzens | 3a499f3 | 2019-06-16 15:25:30 +0200 | [diff] [blame] | 1140 | write_packet_uplink_ack_egprs(dest, wp, tbf, is_final); |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1141 | } else { |
| 1142 | /* PU_AckNack_GPRS = on */ |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1143 | bitvec_write_field(dest, &wp, 0, 1); // 0: GPRS |
Alexander Couzens | 3a499f3 | 2019-06-16 15:25:30 +0200 | [diff] [blame] | 1144 | write_packet_uplink_ack_gprs(dest, wp, tbf, is_final); |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 1145 | } |
| 1146 | |
| 1147 | LOGP(DRLCMACUL, LOGL_DEBUG, |
| 1148 | "Uplink Ack/Nack bit count %d, max %d, message = %s\n", |
| 1149 | wp, dest->data_len * 8, |
| 1150 | osmo_hexdump(dest->data, dest->data_len)); |
| 1151 | } |
| 1152 | |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 1153 | unsigned Encoding::write_packet_paging_request(bitvec * dest) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1154 | { |
| 1155 | unsigned wp = 0; |
| 1156 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 1157 | bitvec_write_field(dest, &wp, 0x1, 2); // Payload Type |
| 1158 | bitvec_write_field(dest, &wp, 0x0, 3); // No polling |
| 1159 | bitvec_write_field(dest, &wp, 0x0, 3); // Uplink state flag |
| 1160 | bitvec_write_field(dest, &wp, 0x22, 6); // MESSAGE TYPE |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1161 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 1162 | bitvec_write_field(dest, &wp, 0x0, 2); // Page Mode |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1163 | |
Alexander Couzens | b3b0c49 | 2019-10-04 03:40:26 +0200 | [diff] [blame] | 1164 | bitvec_write_field(dest, &wp, 0x0, 1); // No PERSISTENCE_LEVEL |
| 1165 | bitvec_write_field(dest, &wp, 0x0, 1); // No NLN |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1166 | |
| 1167 | return wp; |
| 1168 | } |
| 1169 | |
JF Dionne | 1beed38 | 2016-07-26 15:16:08 -0400 | [diff] [blame] | 1170 | /* 3GPP TS 44.060 § 11.2.10: |
| 1171 | < Repeated Page info struct > ::= |
| 1172 | { 0 -- Page request for TBF establishment |
| 1173 | { 0 < PTMSI : bit (32) > |
| 1174 | | 1 < Length of Mobile Identity contents : bit (4) > |
| 1175 | < Mobile Identity : octet (val (Length of Mobile Identity contents)) > } |
| 1176 | | 1 -- Page request for RR conn. establishment |
| 1177 | { 0 < TMSI : bit (32) > |
| 1178 | | 1 < Length of Mobile Identity contents : bit (4) > |
| 1179 | < Mobile Identity : octet (val (Length of Mobile Identity contents)) > } |
| 1180 | < CHANNEL_NEEDED : bit (2) > |
| 1181 | { 0 | 1 < eMLPP_PRIORITY : bit (3) > } |
| 1182 | } |
| 1183 | */ |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 1184 | unsigned Encoding::write_repeated_page_info(bitvec * dest, unsigned& wp, uint8_t len, |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1185 | uint8_t *identity, uint8_t chan_needed) |
| 1186 | { |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1187 | bitvec_write_field(dest, &wp,0x1,1); // Repeated Page info exists |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1188 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1189 | bitvec_write_field(dest, &wp,0x1,1); // RR connection paging |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1190 | |
| 1191 | if ((identity[0] & 0x07) == 4) { |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1192 | bitvec_write_field(dest, &wp,0x0,1); // TMSI |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1193 | identity++; |
| 1194 | len--; |
| 1195 | } else { |
JF Dionne | 1beed38 | 2016-07-26 15:16:08 -0400 | [diff] [blame] | 1196 | bitvec_write_field(dest, &wp,0x1,1); // MI |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1197 | bitvec_write_field(dest, &wp,len,4); // MI len |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1198 | } |
| 1199 | while (len) { |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1200 | bitvec_write_field(dest, &wp,*identity++,8); // MI data |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1201 | len--; |
| 1202 | } |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1203 | bitvec_write_field(dest, &wp,chan_needed,2); // CHANNEL_NEEDED |
| 1204 | bitvec_write_field(dest, &wp,0x0,1); // No eMLPP_PRIORITY |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 1205 | |
| 1206 | return wp; |
| 1207 | } |
| 1208 | |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 1209 | int Encoding::rlc_write_dl_data_header(const struct gprs_rlc_data_info *rlc, |
| 1210 | uint8_t *data) |
| 1211 | { |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1212 | struct gprs_rlc_dl_header_egprs_1 *egprs1; |
| 1213 | struct gprs_rlc_dl_header_egprs_2 *egprs2; |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 1214 | struct gprs_rlc_dl_header_egprs_3 *egprs3; |
| 1215 | struct rlc_dl_header *gprs; |
| 1216 | unsigned int e_fbi_header; |
Pau Espin Pedrol | 2ae8337 | 2020-05-18 11:35:35 +0200 | [diff] [blame] | 1217 | enum CodingScheme cs = rlc->cs; |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1218 | unsigned int offs; |
| 1219 | unsigned int bsn_delta; |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 1220 | |
Pau Espin Pedrol | 2ae8337 | 2020-05-18 11:35:35 +0200 | [diff] [blame] | 1221 | switch(mcs_header_type(cs)) { |
Max | 51754b6 | 2019-03-13 17:14:13 +0100 | [diff] [blame] | 1222 | case HEADER_GPRS_DATA: |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 1223 | gprs = static_cast<struct rlc_dl_header *> |
| 1224 | ((void *)data); |
| 1225 | |
| 1226 | gprs->usf = rlc->usf; |
| 1227 | gprs->s_p = rlc->es_p != 0 ? 1 : 0; |
| 1228 | gprs->rrbp = rlc->rrbp; |
| 1229 | gprs->pt = 0; |
| 1230 | gprs->tfi = rlc->tfi; |
| 1231 | gprs->pr = rlc->pr; |
| 1232 | |
| 1233 | gprs->fbi = rlc->block_info[0].cv == 0; |
| 1234 | gprs->e = rlc->block_info[0].e; |
| 1235 | gprs->bsn = rlc->block_info[0].bsn; |
| 1236 | break; |
| 1237 | |
Max | 51754b6 | 2019-03-13 17:14:13 +0100 | [diff] [blame] | 1238 | case HEADER_EGPRS_DATA_TYPE_1: |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1239 | egprs1 = static_cast<struct gprs_rlc_dl_header_egprs_1 *> |
| 1240 | ((void *)data); |
| 1241 | |
| 1242 | egprs1->usf = rlc->usf; |
| 1243 | egprs1->es_p = rlc->es_p; |
| 1244 | egprs1->rrbp = rlc->rrbp; |
Tom Tsou | df69809 | 2016-07-11 17:05:19 -0700 | [diff] [blame] | 1245 | egprs1->tfi_hi = rlc->tfi >> 0; /* 1 bit LSB */ |
| 1246 | egprs1->tfi_lo = rlc->tfi >> 1; /* 4 bits */ |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1247 | egprs1->pr = rlc->pr; |
| 1248 | egprs1->cps = rlc->cps; |
| 1249 | |
Tom Tsou | df69809 | 2016-07-11 17:05:19 -0700 | [diff] [blame] | 1250 | egprs1->bsn1_hi = rlc->block_info[0].bsn >> 0; /* 2 bits LSB */ |
| 1251 | egprs1->bsn1_mid = rlc->block_info[0].bsn >> 2; /* 8 bits */ |
| 1252 | egprs1->bsn1_lo = rlc->block_info[0].bsn >> 10; /* 1 bit */ |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1253 | |
| 1254 | bsn_delta = (rlc->block_info[1].bsn - rlc->block_info[0].bsn) & |
| 1255 | (RLC_EGPRS_SNS - 1); |
| 1256 | |
Tom Tsou | df69809 | 2016-07-11 17:05:19 -0700 | [diff] [blame] | 1257 | egprs1->bsn2_hi = bsn_delta >> 0; /* 7 bits LSB */ |
| 1258 | egprs1->bsn2_lo = bsn_delta >> 7; /* 3 bits */ |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1259 | |
| 1260 | /* first FBI/E header */ |
| 1261 | e_fbi_header = rlc->block_info[0].e ? 0x01 : 0; |
| 1262 | e_fbi_header |= rlc->block_info[0].cv == 0 ? 0x02 : 0; /* FBI */ |
Jacob Erlbeck | 0f5c695 | 2016-02-03 18:35:27 +0100 | [diff] [blame] | 1263 | offs = rlc->data_offs_bits[0] / 8; |
| 1264 | OSMO_ASSERT(rlc->data_offs_bits[0] % 8 == 2); |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1265 | e_fbi_header <<= 0; |
Jacob Erlbeck | 0f5c695 | 2016-02-03 18:35:27 +0100 | [diff] [blame] | 1266 | data[offs] = (data[offs] & 0b11111100) | e_fbi_header; |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1267 | |
| 1268 | /* second FBI/E header */ |
| 1269 | e_fbi_header = rlc->block_info[1].e ? 0x01 : 0; |
| 1270 | e_fbi_header |= rlc->block_info[1].cv == 0 ? 0x02 : 0; /* FBI */ |
| 1271 | offs = rlc->data_offs_bits[1] / 8; |
| 1272 | OSMO_ASSERT(rlc->data_offs_bits[1] % 8 == 4); |
| 1273 | e_fbi_header <<= 2; |
| 1274 | data[offs] = (data[offs] & 0b11110011) | e_fbi_header; |
| 1275 | break; |
| 1276 | |
Max | 51754b6 | 2019-03-13 17:14:13 +0100 | [diff] [blame] | 1277 | case HEADER_EGPRS_DATA_TYPE_2: |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1278 | egprs2 = static_cast<struct gprs_rlc_dl_header_egprs_2 *> |
| 1279 | ((void *)data); |
| 1280 | |
| 1281 | egprs2->usf = rlc->usf; |
| 1282 | egprs2->es_p = rlc->es_p; |
| 1283 | egprs2->rrbp = rlc->rrbp; |
Tom Tsou | df69809 | 2016-07-11 17:05:19 -0700 | [diff] [blame] | 1284 | egprs2->tfi_hi = rlc->tfi >> 0; /* 1 bit LSB */ |
| 1285 | egprs2->tfi_lo = rlc->tfi >> 1; /* 4 bits */ |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1286 | egprs2->pr = rlc->pr; |
| 1287 | egprs2->cps = rlc->cps; |
| 1288 | |
Tom Tsou | df69809 | 2016-07-11 17:05:19 -0700 | [diff] [blame] | 1289 | egprs2->bsn1_hi = rlc->block_info[0].bsn >> 0; /* 2 bits LSB */ |
| 1290 | egprs2->bsn1_mid = rlc->block_info[0].bsn >> 2; /* 8 bits */ |
| 1291 | egprs2->bsn1_lo = rlc->block_info[0].bsn >> 10; /* 1 bit */ |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1292 | |
| 1293 | e_fbi_header = rlc->block_info[0].e ? 0x01 : 0; |
| 1294 | e_fbi_header |= rlc->block_info[0].cv == 0 ? 0x02 : 0; /* FBI */ |
Jacob Erlbeck | 0f5c695 | 2016-02-03 18:35:27 +0100 | [diff] [blame] | 1295 | offs = rlc->data_offs_bits[0] / 8; |
| 1296 | OSMO_ASSERT(rlc->data_offs_bits[0] % 8 == 6); |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1297 | e_fbi_header <<= 4; |
Jacob Erlbeck | 0f5c695 | 2016-02-03 18:35:27 +0100 | [diff] [blame] | 1298 | data[offs] = (data[offs] & 0b11001111) | e_fbi_header; |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 1299 | break; |
| 1300 | |
Max | 51754b6 | 2019-03-13 17:14:13 +0100 | [diff] [blame] | 1301 | case HEADER_EGPRS_DATA_TYPE_3: |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 1302 | egprs3 = static_cast<struct gprs_rlc_dl_header_egprs_3 *> |
| 1303 | ((void *)data); |
| 1304 | |
| 1305 | egprs3->usf = rlc->usf; |
| 1306 | egprs3->es_p = rlc->es_p; |
| 1307 | egprs3->rrbp = rlc->rrbp; |
Tom Tsou | df69809 | 2016-07-11 17:05:19 -0700 | [diff] [blame] | 1308 | egprs3->tfi_hi = rlc->tfi >> 0; /* 1 bit LSB */ |
| 1309 | egprs3->tfi_lo = rlc->tfi >> 1; /* 4 bits */ |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 1310 | egprs3->pr = rlc->pr; |
| 1311 | egprs3->cps = rlc->cps; |
| 1312 | |
Tom Tsou | df69809 | 2016-07-11 17:05:19 -0700 | [diff] [blame] | 1313 | egprs3->bsn1_hi = rlc->block_info[0].bsn >> 0; /* 2 bits LSB */ |
| 1314 | egprs3->bsn1_mid = rlc->block_info[0].bsn >> 2; /* 8 bits */ |
| 1315 | egprs3->bsn1_lo = rlc->block_info[0].bsn >> 10; /* 1 bit */ |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 1316 | |
| 1317 | egprs3->spb = rlc->block_info[0].spb; |
| 1318 | |
| 1319 | e_fbi_header = rlc->block_info[0].e ? 0x01 : 0; |
| 1320 | e_fbi_header |= rlc->block_info[0].cv == 0 ? 0x02 : 0; /* FBI */ |
Jacob Erlbeck | 0f5c695 | 2016-02-03 18:35:27 +0100 | [diff] [blame] | 1321 | offs = rlc->data_offs_bits[0] / 8; |
| 1322 | OSMO_ASSERT(rlc->data_offs_bits[0] % 8 == 1); |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 1323 | e_fbi_header <<= 7; |
Jacob Erlbeck | 0f5c695 | 2016-02-03 18:35:27 +0100 | [diff] [blame] | 1324 | data[offs-1] = (data[offs-1] & 0b01111111) | (e_fbi_header >> 0); |
| 1325 | data[offs] = (data[offs] & 0b11111110) | (e_fbi_header >> 8); |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 1326 | break; |
| 1327 | |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 1328 | default: |
| 1329 | LOGP(DRLCMACDL, LOGL_ERROR, |
| 1330 | "Encoding of uplink %s data blocks not yet supported.\n", |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 1331 | mcs_name(cs)); |
Jacob Erlbeck | f0e4039 | 2016-01-08 10:07:53 +0100 | [diff] [blame] | 1332 | return -ENOTSUP; |
| 1333 | }; |
| 1334 | |
| 1335 | return 0; |
| 1336 | } |
| 1337 | |
| 1338 | /** |
| 1339 | * \brief Copy LSB bitstream RLC data block from byte aligned buffer. |
| 1340 | * |
| 1341 | * Note that the bitstream is encoded in LSB first order, so the two octets |
| 1342 | * 654321xx xxxxxx87 contain the octet 87654321 starting at bit position 3 |
| 1343 | * (LSB has bit position 1). This is a different order than the one used by |
| 1344 | * CSN.1. |
| 1345 | * |
| 1346 | * \param data_block_idx The block index, 0..1 for header type 1, 0 otherwise |
| 1347 | * \param src A pointer to the start of the RLC block (incl. the header) |
| 1348 | * \param buffer A data area of a least the size of the RLC block |
| 1349 | * \returns the number of bytes copied |
| 1350 | */ |
| 1351 | unsigned int Encoding::rlc_copy_from_aligned_buffer( |
| 1352 | const struct gprs_rlc_data_info *rlc, |
| 1353 | unsigned int data_block_idx, |
| 1354 | uint8_t *dst, const uint8_t *buffer) |
| 1355 | { |
| 1356 | unsigned int hdr_bytes; |
| 1357 | unsigned int extra_bits; |
| 1358 | unsigned int i; |
| 1359 | |
| 1360 | uint8_t c, last_c; |
| 1361 | const uint8_t *src; |
| 1362 | const struct gprs_rlc_data_block_info *rdbi; |
| 1363 | |
| 1364 | OSMO_ASSERT(data_block_idx < rlc->num_data_blocks); |
| 1365 | rdbi = &rlc->block_info[data_block_idx]; |
| 1366 | |
| 1367 | hdr_bytes = rlc->data_offs_bits[data_block_idx] / 8; |
| 1368 | extra_bits = (rlc->data_offs_bits[data_block_idx] % 8); |
| 1369 | |
| 1370 | if (extra_bits == 0) { |
| 1371 | /* It is aligned already */ |
| 1372 | memmove(dst + hdr_bytes, buffer, rdbi->data_len); |
| 1373 | return rdbi->data_len; |
| 1374 | } |
| 1375 | |
| 1376 | src = buffer; |
| 1377 | dst = dst + hdr_bytes; |
| 1378 | last_c = *dst << (8 - extra_bits); |
| 1379 | |
| 1380 | for (i = 0; i < rdbi->data_len; i++) { |
| 1381 | c = src[i]; |
| 1382 | *(dst++) = (last_c >> (8 - extra_bits)) | (c << extra_bits); |
| 1383 | last_c = c; |
| 1384 | } |
| 1385 | |
| 1386 | /* overwrite the lower extra_bits */ |
| 1387 | *dst = (*dst & (0xff << extra_bits)) | (last_c >> (8 - extra_bits)); |
| 1388 | |
| 1389 | return rdbi->data_len; |
| 1390 | } |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1391 | |
Alexander Couzens | cb846ec | 2016-05-30 19:10:48 +0200 | [diff] [blame] | 1392 | /*! |
| 1393 | * \brief (GPRS) put llc pdu into an rlc/mac block. fragment the llc pdu if needed |
| 1394 | * \param rdbi rlc/mac block info |
| 1395 | * \param llc llc pdu |
| 1396 | * \param offset given offset within the rlc/mac block |
| 1397 | * \param num_chunks count the chunks (llc pdu data) within rlc/mac |
| 1398 | * \param data_block buffer holds rlc/mac data |
| 1399 | * \param is_final if this is the last rlc/mac within a TBF |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1400 | * \param count_payload if not NULL save the written size of payload in bytes into it |
Alexander Couzens | cb846ec | 2016-05-30 19:10:48 +0200 | [diff] [blame] | 1401 | * \return the state of the rlc/mac like if there is more space for another chunk |
| 1402 | */ |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1403 | static Encoding::AppendResult rlc_data_to_dl_append_gprs( |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1404 | struct gprs_rlc_data_block_info *rdbi, |
| 1405 | gprs_llc *llc, int *offset, int *num_chunks, |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1406 | uint8_t *data_block, bool is_final, int *count_payload) |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1407 | { |
| 1408 | int chunk; |
| 1409 | int space; |
| 1410 | struct rlc_li_field *li; |
| 1411 | uint8_t *delimiter, *data, *e_pointer; |
| 1412 | |
| 1413 | data = data_block + *offset; |
| 1414 | delimiter = data_block + *num_chunks; |
| 1415 | e_pointer = (*num_chunks ? delimiter - 1 : NULL); |
| 1416 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1417 | chunk = llc_chunk_size(llc); |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1418 | space = rdbi->data_len - *offset; |
| 1419 | |
| 1420 | /* if chunk will exceed block limit */ |
| 1421 | if (chunk > space) { |
| 1422 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1423 | "larger than space (%d) left in block: copy " |
| 1424 | "only remaining space, and we are done\n", |
| 1425 | chunk, space); |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1426 | if (e_pointer) { |
| 1427 | /* LLC frame not finished, so there is no extension octet */ |
| 1428 | *e_pointer |= 0x02; /* set previous M bit = 1 */ |
| 1429 | } |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1430 | /* fill only space */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1431 | llc_consume_data(llc, data, space); |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1432 | if (count_payload) |
| 1433 | *count_payload = space; |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1434 | /* return data block as message */ |
| 1435 | *offset = rdbi->data_len; |
| 1436 | (*num_chunks)++; |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1437 | return Encoding::AR_NEED_MORE_BLOCKS; |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1438 | } |
| 1439 | /* if FINAL chunk would fit precisely in space left */ |
| 1440 | if (chunk == space && is_final) |
| 1441 | { |
| 1442 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1443 | "would exactly fit into space (%d): because " |
| 1444 | "this is a final block, we don't add length " |
| 1445 | "header, and we are done\n", chunk, space); |
| 1446 | /* block is filled, so there is no extension */ |
| 1447 | if (e_pointer) |
| 1448 | *e_pointer |= 0x01; |
| 1449 | /* fill space */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1450 | llc_consume_data(llc, data, space); |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1451 | if (count_payload) |
| 1452 | *count_payload = space; |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1453 | *offset = rdbi->data_len; |
| 1454 | (*num_chunks)++; |
| 1455 | rdbi->cv = 0; |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1456 | return Encoding::AR_COMPLETED_BLOCK_FILLED; |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1457 | } |
| 1458 | /* if chunk would fit exactly in space left */ |
| 1459 | if (chunk == space) { |
| 1460 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1461 | "would exactly fit into space (%d): add length " |
| 1462 | "header with LI=0, to make frame extend to " |
| 1463 | "next block, and we are done\n", chunk, space); |
| 1464 | /* make space for delimiter */ |
| 1465 | if (delimiter != data) |
| 1466 | memmove(delimiter + 1, delimiter, |
| 1467 | data - delimiter); |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1468 | if (e_pointer) { |
| 1469 | *e_pointer &= 0xfe; /* set previous E bit = 0 */ |
| 1470 | *e_pointer |= 0x02; /* set previous M bit = 1 */ |
| 1471 | } |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1472 | data++; |
| 1473 | (*offset)++; |
| 1474 | space--; |
| 1475 | /* add LI with 0 length */ |
| 1476 | li = (struct rlc_li_field *)delimiter; |
| 1477 | li->e = 1; /* not more extension */ |
| 1478 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 1479 | li->li = 0; /* chunk fills the complete space */ |
| 1480 | rdbi->e = 0; /* 0: extensions present */ |
| 1481 | // no need to set e_pointer nor increase delimiter |
| 1482 | /* fill only space, which is 1 octet less than chunk */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1483 | llc_consume_data(llc, data, space); |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1484 | if (count_payload) |
| 1485 | *count_payload = space; |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1486 | /* return data block as message */ |
| 1487 | *offset = rdbi->data_len; |
| 1488 | (*num_chunks)++; |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1489 | return Encoding::AR_NEED_MORE_BLOCKS; |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1490 | } |
| 1491 | |
| 1492 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 1493 | "than remaining space (%d): add length header to " |
Pau Espin Pedrol | 49efd9b | 2020-11-13 13:46:27 +0100 | [diff] [blame] | 1494 | "delimit LLC frame\n", chunk, space); |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1495 | /* the LLC frame chunk ends in this block */ |
| 1496 | /* make space for delimiter */ |
| 1497 | if (delimiter != data) |
| 1498 | memmove(delimiter + 1, delimiter, data - delimiter); |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1499 | if (e_pointer) { |
| 1500 | *e_pointer &= 0xfe; /* set previous E bit = 0 */ |
| 1501 | *e_pointer |= 0x02; /* set previous M bit = 1 */ |
| 1502 | } |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1503 | data++; |
| 1504 | (*offset)++; |
| 1505 | space--; |
| 1506 | /* add LI to delimit frame */ |
| 1507 | li = (struct rlc_li_field *)delimiter; |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1508 | li->e = 1; /* not more extension, maybe set later */ |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1509 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 1510 | li->li = chunk; /* length of chunk */ |
| 1511 | rdbi->e = 0; /* 0: extensions present */ |
| 1512 | (*num_chunks)++; |
| 1513 | /* copy (rest of) LLC frame to space and reset later */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1514 | llc_consume_data(llc, data, chunk); |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1515 | if (count_payload) |
| 1516 | *count_payload = chunk; |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1517 | data += chunk; |
| 1518 | space -= chunk; |
| 1519 | (*offset) += chunk; |
| 1520 | /* if we have more data and we have space left */ |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1521 | if (space > 0 && !is_final) |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1522 | return Encoding::AR_COMPLETED_SPACE_LEFT; |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1523 | |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1524 | /* if we don't have more LLC frames */ |
| 1525 | if (is_final) { |
| 1526 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
| 1527 | "done.\n"); |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1528 | rdbi->cv = 0; |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1529 | return Encoding::AR_COMPLETED_BLOCK_FILLED; |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1530 | } |
| 1531 | /* we have no space left */ |
| 1532 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
| 1533 | "done.\n"); |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1534 | return Encoding::AR_COMPLETED_BLOCK_FILLED; |
| 1535 | } |
| 1536 | |
Alexander Couzens | cb846ec | 2016-05-30 19:10:48 +0200 | [diff] [blame] | 1537 | /*! |
| 1538 | * \brief (EGPRS) put llc pdu into an rlc/mac block. fragment the llc pdu if needed |
| 1539 | * \param rdbi rlc/mac block info |
| 1540 | * \param llc llc pdu |
| 1541 | * \param offset given offset within the rlc/mac block |
| 1542 | * \param num_chunks count the chunks (llc pdu data) within rlc/mac |
| 1543 | * \param data_block buffer holds rlc/mac data |
| 1544 | * \param is_final if this is the last rlc/mac within a TBF |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1545 | * \param count_payload if not NULL save the written size of payload in bytes into it |
Alexander Couzens | cb846ec | 2016-05-30 19:10:48 +0200 | [diff] [blame] | 1546 | * \return the state of the rlc/mac like if there is more space for another chunk |
| 1547 | */ |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1548 | static Encoding::AppendResult rlc_data_to_dl_append_egprs( |
| 1549 | struct gprs_rlc_data_block_info *rdbi, |
| 1550 | gprs_llc *llc, int *offset, int *num_chunks, |
| 1551 | uint8_t *data_block, |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1552 | bool is_final, int *count_payload) |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1553 | { |
| 1554 | int chunk; |
| 1555 | int space; |
| 1556 | struct rlc_li_field_egprs *li; |
| 1557 | struct rlc_li_field_egprs *prev_li; |
| 1558 | uint8_t *delimiter, *data; |
| 1559 | |
| 1560 | data = data_block + *offset; |
| 1561 | delimiter = data_block + *num_chunks; |
| 1562 | prev_li = (struct rlc_li_field_egprs *) |
| 1563 | (*num_chunks ? delimiter - 1 : NULL); |
| 1564 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1565 | chunk = llc_chunk_size(llc); |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1566 | space = rdbi->data_len - *offset; |
| 1567 | |
| 1568 | /* if chunk will exceed block limit */ |
| 1569 | if (chunk > space) { |
| 1570 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1571 | "larger than space (%d) left in block: copy " |
| 1572 | "only remaining space, and we are done\n", |
| 1573 | chunk, space); |
| 1574 | /* fill only space */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1575 | llc_consume_data(llc, data, space); |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1576 | if (count_payload) |
| 1577 | *count_payload = space; |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1578 | /* return data block as message */ |
| 1579 | *offset = rdbi->data_len; |
| 1580 | (*num_chunks)++; |
| 1581 | return Encoding::AR_NEED_MORE_BLOCKS; |
| 1582 | } |
| 1583 | /* if FINAL chunk would fit precisely in space left */ |
| 1584 | if (chunk == space && is_final) |
| 1585 | { |
| 1586 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1587 | "would exactly fit into space (%d): because " |
| 1588 | "this is a final block, we don't add length " |
| 1589 | "header, and we are done\n", chunk, space); |
| 1590 | /* fill space */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1591 | llc_consume_data(llc, data, space); |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1592 | if (count_payload) |
| 1593 | *count_payload = space; |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1594 | *offset = rdbi->data_len; |
| 1595 | (*num_chunks)++; |
| 1596 | rdbi->cv = 0; |
| 1597 | return Encoding::AR_COMPLETED_BLOCK_FILLED; |
| 1598 | } |
| 1599 | /* if chunk would fit exactly in space left */ |
| 1600 | if (chunk == space) { |
| 1601 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1602 | "would exactly fit into space (%d): just copy " |
| 1603 | "it, and we are done. The next block will have " |
| 1604 | "to start with an empty chunk\n", |
| 1605 | chunk, space); |
| 1606 | /* fill space */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1607 | llc_consume_data(llc, data, space); |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1608 | if (count_payload) |
| 1609 | *count_payload = space; |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1610 | *offset = rdbi->data_len; |
| 1611 | (*num_chunks)++; |
| 1612 | return Encoding::AR_NEED_MORE_BLOCKS; |
| 1613 | } |
| 1614 | |
| 1615 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 1616 | "than remaining space (%d): add length header to " |
| 1617 | "to delimit LLC frame\n", chunk, space); |
| 1618 | /* the LLC frame chunk ends in this block */ |
| 1619 | /* make space for delimiter */ |
| 1620 | |
| 1621 | if (delimiter != data) |
| 1622 | memmove(delimiter + 1, delimiter, data - delimiter); |
| 1623 | |
| 1624 | data += 1; |
| 1625 | (*offset) += 1; |
| 1626 | space -= 1; |
| 1627 | /* add LI to delimit frame */ |
| 1628 | li = (struct rlc_li_field_egprs *)delimiter; |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1629 | li->e = 1; /* not more extension, maybe set later */ |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1630 | li->li = chunk; /* length of chunk */ |
| 1631 | /* tell previous extension header about the new one */ |
| 1632 | if (prev_li) |
| 1633 | prev_li->e = 0; |
| 1634 | rdbi->e = 0; /* 0: extensions present */ |
| 1635 | delimiter++; |
| 1636 | prev_li = li; |
| 1637 | (*num_chunks)++; |
| 1638 | /* copy (rest of) LLC frame to space and reset later */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1639 | llc_consume_data(llc, data, chunk); |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1640 | if (count_payload) |
| 1641 | *count_payload = chunk; |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1642 | data += chunk; |
| 1643 | space -= chunk; |
| 1644 | (*offset) += chunk; |
| 1645 | /* if we have more data and we have space left */ |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1646 | if (!is_final) { |
| 1647 | if (space > 0) { |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1648 | return Encoding::AR_COMPLETED_SPACE_LEFT; |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1649 | } else { |
| 1650 | /* we have no space left */ |
| 1651 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
| 1652 | "done.\n"); |
| 1653 | return Encoding::AR_COMPLETED_BLOCK_FILLED; |
| 1654 | } |
| 1655 | } else { |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1656 | /* we don't have more LLC frames */ |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1657 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we are done.\n"); |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1658 | rdbi->cv = 0; |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1659 | if (space > 0) |
| 1660 | Encoding::rlc_data_to_dl_append_egprs_li_padding(rdbi, |
| 1661 | offset, |
| 1662 | num_chunks, |
| 1663 | data_block); |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1664 | return Encoding::AR_COMPLETED_BLOCK_FILLED; |
| 1665 | } |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1666 | } |
| 1667 | |
Alexander Couzens | cb846ec | 2016-05-30 19:10:48 +0200 | [diff] [blame] | 1668 | /*! |
| 1669 | * \brief Encoding::rlc_data_to_dl_append |
| 1670 | * \param rdbi rlc/mac block info |
| 1671 | * \param cs the coding scheme to use |
| 1672 | * \param llc llc pdu |
| 1673 | * \param offset given offset within the rlc/mac block |
| 1674 | * \param num_chunks count the chunks (llc pdu data) within rlc/mac |
| 1675 | * \param data_block buffer holds rlc/mac data |
| 1676 | * \param is_final if this is the last rlc/mac within a TBF |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1677 | * \param count_payload if not NULL save the written size of payload in bytes into it |
Alexander Couzens | cb846ec | 2016-05-30 19:10:48 +0200 | [diff] [blame] | 1678 | * \return the state of the rlc/mac like if there is more space for another chunk |
| 1679 | */ |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1680 | Encoding::AppendResult Encoding::rlc_data_to_dl_append( |
Pau Espin Pedrol | 2ae8337 | 2020-05-18 11:35:35 +0200 | [diff] [blame] | 1681 | struct gprs_rlc_data_block_info *rdbi, enum CodingScheme cs, |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1682 | gprs_llc *llc, int *offset, int *num_chunks, |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1683 | uint8_t *data_block, bool is_final, int *count_payload) |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1684 | { |
Max | 8a8e0fb | 2019-03-25 16:32:50 +0100 | [diff] [blame] | 1685 | if (mcs_is_gprs(cs)) |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1686 | return rlc_data_to_dl_append_gprs(rdbi, |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1687 | llc, offset, num_chunks, data_block, is_final, |
| 1688 | count_payload); |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1689 | |
Max | 8a8e0fb | 2019-03-25 16:32:50 +0100 | [diff] [blame] | 1690 | if (mcs_is_edge(cs)) |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1691 | return rlc_data_to_dl_append_egprs(rdbi, |
Alexander Couzens | 6f0dc96 | 2016-05-30 19:30:21 +0200 | [diff] [blame] | 1692 | llc, offset, num_chunks, data_block, is_final, |
| 1693 | count_payload); |
Jacob Erlbeck | a88d065 | 2016-01-13 11:28:10 +0100 | [diff] [blame] | 1694 | |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1695 | LOGP(DRLCMACDL, LOGL_ERROR, "%s data block encoding not implemented\n", |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 1696 | mcs_name(cs)); |
Pau Espin Pedrol | f1159c5 | 2020-11-04 17:53:07 +0100 | [diff] [blame] | 1697 | OSMO_ASSERT(mcs_is_valid(cs)); |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 1698 | |
| 1699 | return AR_NEED_MORE_BLOCKS; |
Jacob Erlbeck | 14bb094 | 2016-01-12 11:58:13 +0100 | [diff] [blame] | 1700 | } |
aravind sirsikar | ed3413e | 2016-11-11 17:15:10 +0530 | [diff] [blame] | 1701 | |
Pau Espin Pedrol | 7d0f9a0 | 2020-11-27 14:51:27 +0100 | [diff] [blame] | 1702 | void Encoding::rlc_data_to_dl_append_egprs_li_padding( |
| 1703 | const struct gprs_rlc_data_block_info *rdbi, |
| 1704 | int *offset, int *num_chunks, uint8_t *data_block) |
| 1705 | { |
| 1706 | struct rlc_li_field_egprs *li; |
| 1707 | struct rlc_li_field_egprs *prev_li; |
| 1708 | uint8_t *delimiter, *data; |
| 1709 | |
| 1710 | LOGP(DRLCMACDL, LOGL_DEBUG, "Adding LI=127 to signal padding\n"); |
| 1711 | |
| 1712 | data = data_block + *offset; |
| 1713 | delimiter = data_block + *num_chunks; |
| 1714 | prev_li = (struct rlc_li_field_egprs *)(*num_chunks ? delimiter - 1 : NULL); |
| 1715 | |
| 1716 | /* we don't have more LLC frames */ |
| 1717 | /* We will have to add another chunk with filling octets */ |
| 1718 | |
| 1719 | if (delimiter != data) |
| 1720 | memmove(delimiter + 1, delimiter, data - delimiter); |
| 1721 | |
| 1722 | /* set filling bytes extension */ |
| 1723 | li = (struct rlc_li_field_egprs *)delimiter; |
| 1724 | li->e = 1; |
| 1725 | li->li = 127; |
| 1726 | |
| 1727 | /* tell previous extension header about the new one */ |
| 1728 | if (prev_li) |
| 1729 | prev_li->e = 0; |
| 1730 | |
| 1731 | (*num_chunks)++; |
| 1732 | *offset = rdbi->data_len; |
| 1733 | } |
| 1734 | |
aravind sirsikar | ed3413e | 2016-11-11 17:15:10 +0530 | [diff] [blame] | 1735 | /* |
| 1736 | * Refer 44.060 version 7.27.0 Release 7 |
| 1737 | * section 7.1.3.2.1 On receipt of a PACKET RESOURCE REQUEST message |
| 1738 | * 8.1.2.5 Establishment of uplink TBF |
| 1739 | */ |
| 1740 | void Encoding::write_packet_access_reject( |
Pau Espin Pedrol | 2ab840a | 2021-04-26 17:49:05 +0200 | [diff] [blame] | 1741 | bitvec * dest, uint32_t tlli, unsigned long t3172_ms) |
aravind sirsikar | ed3413e | 2016-11-11 17:15:10 +0530 | [diff] [blame] | 1742 | { |
| 1743 | unsigned wp = 0; |
| 1744 | |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1745 | bitvec_write_field(dest, &wp, 0x1, 2); // Payload Type |
| 1746 | bitvec_write_field(dest, &wp, 0x0, 2); // Uplink block with TDMA FN |
| 1747 | bitvec_write_field(dest, &wp, 0, 1); // No Polling Bit |
| 1748 | bitvec_write_field(dest, &wp, 0x0, 3); // Uplink state flag |
| 1749 | bitvec_write_field(dest, &wp, |
aravind sirsikar | ed3413e | 2016-11-11 17:15:10 +0530 | [diff] [blame] | 1750 | MT_PACKET_ACCESS_REJECT, 6); // MESSAGE TYPE |
Alexander Couzens | ccde5c9 | 2017-02-04 03:10:08 +0100 | [diff] [blame] | 1751 | bitvec_write_field(dest, &wp, 0, 2); // fixed 00 |
| 1752 | bitvec_write_field(dest, &wp, 0x0, 1); // TLLI / G-RNTI : bit (32) |
| 1753 | bitvec_write_field(dest, &wp, tlli, 32); // CONTENTION_RESOLUTION_TLLI |
| 1754 | bitvec_write_field(dest, &wp, 1, 1); // WAIT_INDICATION size in seconds |
Pau Espin Pedrol | 2ab840a | 2021-04-26 17:49:05 +0200 | [diff] [blame] | 1755 | |
| 1756 | /* WAIT_INDICATION, WAIT_INDICATION_SIZE */ |
| 1757 | if (t3172_ms / 20 <= 255) { /* In units of 20 milliseconds */ |
| 1758 | bitvec_write_field(dest, &wp, t3172_ms/20, 8); |
| 1759 | bitvec_write_field(dest, &wp, 1, 1); |
| 1760 | } else { /* value too big to fit in ms, do it in seconds */ |
| 1761 | bitvec_write_field(dest, &wp, t3172_ms/1000, 8); |
| 1762 | bitvec_write_field(dest, &wp, 0, 1); |
| 1763 | } |
aravind sirsikar | ed3413e | 2016-11-11 17:15:10 +0530 | [diff] [blame] | 1764 | } |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1765 | |
| 1766 | void write_packet_neighbour_cell_data(RlcMacDownlink_t *block, |
| 1767 | bool tfi_is_dl, uint8_t tfi, uint8_t container_id, |
| 1768 | uint8_t container_idx, PNCDContainer_t *container) |
| 1769 | { |
| 1770 | |
| 1771 | block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header |
| 1772 | block->RRBP = 0; // 0: N+13 |
Pau Espin Pedrol | 4668dc6 | 2021-02-01 16:26:29 +0100 | [diff] [blame] | 1773 | block->SP = 0; // RRBP field is not valid |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1774 | block->USF = 0x0; // Uplink state flag |
| 1775 | |
| 1776 | block->u.Packet_Neighbour_Cell_Data.MESSAGE_TYPE = MT_PACKET_NEIGHBOUR_CELL_DATA; |
| 1777 | block->u.Packet_Neighbour_Cell_Data.PAGE_MODE = 0x0; // Normal Paging |
| 1778 | |
| 1779 | block->u.Packet_Neighbour_Cell_Data.Global_TFI.UnionType = tfi_is_dl; // 0=UPLINK TFI, 1=DL TFI |
| 1780 | if (tfi_is_dl) { |
| 1781 | block->u.Packet_Neighbour_Cell_Data.Global_TFI.u.DOWNLINK_TFI = tfi; |
| 1782 | } else { |
| 1783 | block->u.Packet_Neighbour_Cell_Data.Global_TFI.u.UPLINK_TFI = tfi; |
| 1784 | } |
| 1785 | block->u.Packet_Neighbour_Cell_Data.CONTAINER_ID = container_id; |
| 1786 | block->u.Packet_Neighbour_Cell_Data.spare = 0; |
| 1787 | block->u.Packet_Neighbour_Cell_Data.CONTAINER_INDEX = container_idx; |
| 1788 | block->u.Packet_Neighbour_Cell_Data.Container = *container; |
| 1789 | } |
| 1790 | |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 1791 | void write_packet_cell_change_continue(RlcMacDownlink_t *block, uint8_t poll, uint8_t rrbp, |
| 1792 | bool tfi_is_dl, uint8_t tfi, bool exist_id, |
| 1793 | uint16_t arfcn, uint8_t bsic, uint8_t container_id) |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1794 | { |
| 1795 | |
| 1796 | block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 1797 | block->RRBP = rrbp; // RRBP (e.g. N+13) |
| 1798 | block->SP = poll; // RRBP field is valid? |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1799 | block->USF = 0x0; // Uplink state flag |
| 1800 | |
| 1801 | block->u.Packet_Cell_Change_Continue.MESSAGE_TYPE = MT_PACKET_CELL_CHANGE_CONTINUE; |
| 1802 | block->u.Packet_Cell_Change_Continue.PAGE_MODE = 0x0; // Normal Paging |
| 1803 | |
| 1804 | block->u.Packet_Cell_Change_Continue.Global_TFI.UnionType = tfi_is_dl; // 0=UPLINK TFI, 1=DL TFI |
| 1805 | if (tfi_is_dl) { |
| 1806 | block->u.Packet_Cell_Change_Continue.Global_TFI.u.DOWNLINK_TFI = tfi; |
| 1807 | } else { |
| 1808 | block->u.Packet_Cell_Change_Continue.Global_TFI.u.UPLINK_TFI = tfi; |
| 1809 | } |
| 1810 | |
| 1811 | block->u.Packet_Cell_Change_Continue.Exist_ID = exist_id; |
| 1812 | if (exist_id) { |
| 1813 | block->u.Packet_Cell_Change_Continue.ARFCN = arfcn; |
| 1814 | block->u.Packet_Cell_Change_Continue.BSIC = bsic; |
| 1815 | } |
| 1816 | block->u.Packet_Cell_Change_Continue.CONTAINER_ID = container_id; |
| 1817 | } |