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> |
| 26 | #include <gprs_debug.h> |
| 27 | |
| 28 | // GSM 04.08 9.1.18 Immediate assignment |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 29 | int Encoding::write_immediate_assignment( |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 30 | struct gprs_rlcmac_bts *bts, |
| 31 | bitvec * dest, uint8_t downlink, uint8_t ra, |
| 32 | uint32_t ref_fn, uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc, |
| 33 | uint8_t tfi, uint8_t usf, uint32_t tlli, |
| 34 | uint8_t polling, uint32_t fn, uint8_t single_block, uint8_t alpha, |
| 35 | uint8_t gamma, int8_t ta_idx) |
| 36 | { |
| 37 | unsigned wp = 0; |
| 38 | uint8_t plen; |
| 39 | |
| 40 | bitvec_write_field(dest, wp,0x0,4); // Skip Indicator |
| 41 | bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator |
| 42 | bitvec_write_field(dest, wp,0x3F,8); // Immediate Assignment Message Type |
| 43 | |
| 44 | // 10.5.2.25b Dedicated mode or TBF |
| 45 | bitvec_write_field(dest, wp,0x0,1); // spare |
| 46 | bitvec_write_field(dest, wp,0x0,1); // TMA : Two-message assignment: No meaning |
| 47 | bitvec_write_field(dest, wp,downlink,1); // Downlink : Downlink assignment to mobile in packet idle mode |
| 48 | bitvec_write_field(dest, wp,0x1,1); // T/D : TBF or dedicated mode: this message assigns a Temporary Block Flow (TBF). |
| 49 | |
| 50 | bitvec_write_field(dest, wp,0x0,4); // Page Mode |
| 51 | |
| 52 | // GSM 04.08 10.5.2.25a Packet Channel Description |
| 53 | bitvec_write_field(dest, wp,0x1,5); // Channel type |
| 54 | bitvec_write_field(dest, wp,ts,3); // TN |
| 55 | bitvec_write_field(dest, wp,tsc,3); // TSC |
| 56 | bitvec_write_field(dest, wp,0x0,3); // non-hopping RF channel configuraion |
| 57 | bitvec_write_field(dest, wp,arfcn,10); // ARFCN |
| 58 | |
| 59 | //10.5.2.30 Request Reference |
| 60 | bitvec_write_field(dest, wp,ra,8); // RA |
| 61 | bitvec_write_field(dest, wp,(ref_fn / (26 * 51)) % 32,5); // T1' |
| 62 | bitvec_write_field(dest, wp,ref_fn % 51,6); // T3 |
| 63 | bitvec_write_field(dest, wp,ref_fn % 26,5); // T2 |
| 64 | |
| 65 | // 10.5.2.40 Timing Advance |
| 66 | bitvec_write_field(dest, wp,0x0,2); // spare |
| 67 | bitvec_write_field(dest, wp,ta,6); // Timing Advance value |
| 68 | |
| 69 | // No mobile allocation in non-hopping systems. |
| 70 | // A zero-length LV. Just write L=0. |
| 71 | bitvec_write_field(dest, wp,0,8); |
| 72 | |
| 73 | if ((wp % 8)) { |
| 74 | LOGP(DRLCMACUL, LOGL_ERROR, "Length of IMM.ASS without rest " |
| 75 | "octets is not multiple of 8 bits, PLEASE FIX!\n"); |
| 76 | exit (0); |
| 77 | } |
| 78 | plen = wp / 8; |
| 79 | |
| 80 | if (downlink) |
| 81 | { |
| 82 | // GSM 04.08 10.5.2.16 IA Rest Octets |
| 83 | bitvec_write_field(dest, wp, 3, 2); // "HH" |
| 84 | bitvec_write_field(dest, wp, 1, 2); // "01" Packet Downlink Assignment |
| 85 | bitvec_write_field(dest, wp,tlli,32); // TLLI |
| 86 | bitvec_write_field(dest, wp,0x1,1); // switch TFI : on |
| 87 | bitvec_write_field(dest, wp,tfi,5); // TFI |
| 88 | bitvec_write_field(dest, wp,0x0,1); // RLC acknowledged mode |
| 89 | if (alpha) { |
| 90 | bitvec_write_field(dest, wp,0x1,1); // ALPHA = present |
| 91 | bitvec_write_field(dest, wp,alpha,4); // ALPHA |
| 92 | } else { |
| 93 | bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present |
| 94 | } |
| 95 | bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| 96 | bitvec_write_field(dest, wp,polling,1); // Polling Bit |
| 97 | bitvec_write_field(dest, wp,!polling,1); // TA_VALID ??? |
| 98 | if (ta_idx < 0) { |
| 99 | bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| 100 | } else { |
| 101 | bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| 102 | bitvec_write_field(dest, wp,ta_idx,4); // TIMING_ADVANCE_INDEX |
| 103 | } |
| 104 | if (polling) { |
| 105 | bitvec_write_field(dest, wp,0x1,1); // TBF Starting TIME present |
| 106 | bitvec_write_field(dest, wp,(fn / (26 * 51)) % 32,5); // T1' |
| 107 | bitvec_write_field(dest, wp,fn % 51,6); // T3 |
| 108 | bitvec_write_field(dest, wp,fn % 26,5); // T2 |
| 109 | } else { |
| 110 | bitvec_write_field(dest, wp,0x0,1); // TBF Starting TIME present |
| 111 | } |
| 112 | bitvec_write_field(dest, wp,0x0,1); // P0 not present |
| 113 | // bitvec_write_field(dest, wp,0x1,1); // P0 not present |
| 114 | // bitvec_write_field(dest, wp,0xb,4); |
| 115 | } |
| 116 | else |
| 117 | { |
| 118 | // GMS 04.08 10.5.2.37b 10.5.2.16 |
| 119 | bitvec_write_field(dest, wp, 3, 2); // "HH" |
| 120 | bitvec_write_field(dest, wp, 0, 2); // "0" Packet Uplink Assignment |
| 121 | if (single_block) { |
| 122 | bitvec_write_field(dest, wp, 0, 1); // Block Allocation : Single Block Allocation |
| 123 | if (alpha) { |
| 124 | bitvec_write_field(dest, wp,0x1,1); // ALPHA = present |
| 125 | bitvec_write_field(dest, wp,alpha,4); // ALPHA = present |
| 126 | } else |
| 127 | bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present |
| 128 | bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| 129 | if (ta_idx < 0) { |
| 130 | bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| 131 | } else { |
| 132 | bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| 133 | bitvec_write_field(dest, wp,ta_idx,4); // TIMING_ADVANCE_INDEX |
| 134 | } |
| 135 | bitvec_write_field(dest, wp, 1, 1); // TBF_STARTING_TIME_FLAG |
| 136 | bitvec_write_field(dest, wp,(fn / (26 * 51)) % 32,5); // T1' |
| 137 | bitvec_write_field(dest, wp,fn % 51,6); // T3 |
| 138 | bitvec_write_field(dest, wp,fn % 26,5); // T2 |
| 139 | } else { |
| 140 | bitvec_write_field(dest, wp, 1, 1); // Block Allocation : Not Single Block Allocation |
| 141 | bitvec_write_field(dest, wp, tfi, 5); // TFI_ASSIGNMENT Temporary Flow Identity |
| 142 | bitvec_write_field(dest, wp, 0, 1); // POLLING |
| 143 | bitvec_write_field(dest, wp, 0, 1); // ALLOCATION_TYPE: dynamic |
| 144 | bitvec_write_field(dest, wp, usf, 3); // USF |
| 145 | bitvec_write_field(dest, wp, 0, 1); // USF_GRANULARITY |
| 146 | bitvec_write_field(dest, wp, 0, 1); // "0" power control: Not Present |
| 147 | bitvec_write_field(dest, wp, bts->initial_cs_ul-1, 2); // CHANNEL_CODING_COMMAND |
| 148 | bitvec_write_field(dest, wp, 1, 1); // TLLI_BLOCK_CHANNEL_CODING |
| 149 | if (alpha) { |
| 150 | bitvec_write_field(dest, wp,0x1,1); // ALPHA = present |
| 151 | bitvec_write_field(dest, wp,alpha,4); // ALPHA |
| 152 | } else |
| 153 | bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present |
| 154 | bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| 155 | /* note: there is no choise for TAI and no starting time */ |
| 156 | bitvec_write_field(dest, wp, 0, 1); // switch TIMING_ADVANCE_INDEX = off |
| 157 | bitvec_write_field(dest, wp, 0, 1); // TBF_STARTING_TIME_FLAG |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | return plen; |
| 162 | } |
| 163 | |
| 164 | /* generate uplink assignment */ |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 165 | void Encoding::write_packet_uplink_assignment( |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 166 | struct gprs_rlcmac_bts *bts, |
| 167 | bitvec * dest, uint8_t old_tfi, |
| 168 | uint8_t old_downlink, uint32_t tlli, uint8_t use_tlli, |
Daniel Willmann | f55e58f | 2014-08-07 15:02:16 +0200 | [diff] [blame] | 169 | struct gprs_rlcmac_ul_tbf *tbf, uint8_t poll, uint8_t alpha, |
Jacob Erlbeck | 76d767c | 2015-09-28 18:54:32 +0200 | [diff] [blame] | 170 | uint8_t gamma, int8_t ta_idx, int8_t use_egprs) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 171 | { |
| 172 | // TODO We should use our implementation of encode RLC/MAC Control messages. |
| 173 | unsigned wp = 0; |
| 174 | uint8_t ts; |
| 175 | |
| 176 | bitvec_write_field(dest, wp,0x1,2); // Payload Type |
| 177 | bitvec_write_field(dest, wp,0x0,2); // Uplink block with TDMA framenumber (N+13) |
| 178 | bitvec_write_field(dest, wp,poll,1); // Suppl/Polling Bit |
| 179 | bitvec_write_field(dest, wp,0x0,3); // Uplink state flag |
| 180 | bitvec_write_field(dest, wp,0xa,6); // MESSAGE TYPE |
| 181 | |
| 182 | bitvec_write_field(dest, wp,0x0,2); // Page Mode |
| 183 | |
| 184 | bitvec_write_field(dest, wp,0x0,1); // switch PERSIST_LEVEL: off |
| 185 | if (use_tlli) { |
| 186 | bitvec_write_field(dest, wp,0x2,2); // switch TLLI : on |
| 187 | bitvec_write_field(dest, wp,tlli,32); // TLLI |
| 188 | } else { |
| 189 | bitvec_write_field(dest, wp,0x0,1); // switch TFI : on |
| 190 | bitvec_write_field(dest, wp,old_downlink,1); // 0=UPLINK TFI, 1=DL TFI |
| 191 | bitvec_write_field(dest, wp,old_tfi,5); // TFI |
| 192 | } |
| 193 | |
Jacob Erlbeck | 76d767c | 2015-09-28 18:54:32 +0200 | [diff] [blame] | 194 | if (!use_egprs) { |
| 195 | bitvec_write_field(dest, wp,0x0,1); // Message escape |
Jacob Erlbeck | cb72890 | 2016-01-05 15:33:03 +0100 | [diff] [blame] | 196 | bitvec_write_field(dest, wp,tbf->current_cs().to_num()-1, 2); // CHANNEL_CODING_COMMAND |
Jacob Erlbeck | 76d767c | 2015-09-28 18:54:32 +0200 | [diff] [blame] | 197 | bitvec_write_field(dest, wp,0x1,1); // TLLI_BLOCK_CHANNEL_CODING |
| 198 | bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_VALUE = on |
| 199 | bitvec_write_field(dest, wp,tbf->ta(),6); // TIMING_ADVANCE_VALUE |
| 200 | if (ta_idx < 0) { |
| 201 | bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| 202 | } else { |
| 203 | bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| 204 | bitvec_write_field(dest, wp,ta_idx,4); // TIMING_ADVANCE_INDEX |
| 205 | } |
| 206 | |
| 207 | } else { /* EPGRS */ |
| 208 | bitvec_write_field(dest, wp,0x1,1); // Message escape |
| 209 | bitvec_write_field(dest, wp,0x0,2); // EGPRS message contents |
| 210 | bitvec_write_field(dest, wp,0x0,1); // No CONTENTION_RESOLUTION_TLLI |
| 211 | bitvec_write_field(dest, wp,0x0,1); // No COMPACT reduced MA |
Jacob Erlbeck | cb72890 | 2016-01-05 15:33:03 +0100 | [diff] [blame] | 212 | bitvec_write_field(dest, wp,tbf->current_cs().to_num()-1, 4); // EGPRS Modulation and Coding IE |
Jacob Erlbeck | 76d767c | 2015-09-28 18:54:32 +0200 | [diff] [blame] | 213 | bitvec_write_field(dest, wp,0x0,1); // No RESEGMENT |
| 214 | bitvec_write_field(dest, wp,0x0,5); // EGPRS Window Size = 64 |
| 215 | bitvec_write_field(dest, wp,0x0,1); // No Access Technologies Request |
| 216 | bitvec_write_field(dest, wp,0x0,1); // No ARAC RETRANSMISSION REQUEST |
| 217 | bitvec_write_field(dest, wp,0x1,1); // TLLI_BLOCK_CHANNEL_CODING |
| 218 | bitvec_write_field(dest, wp,0x0,1); // No BEP_PERIOD2 |
| 219 | |
| 220 | bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_VALUE = on |
| 221 | bitvec_write_field(dest, wp,tbf->ta(),6); // TIMING_ADVANCE_VALUE |
| 222 | if (ta_idx < 0) { |
| 223 | bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| 224 | } else { |
| 225 | bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| 226 | bitvec_write_field(dest, wp,ta_idx,4); // TIMING_ADVANCE_INDEX |
| 227 | } |
| 228 | |
| 229 | bitvec_write_field(dest, wp,0x0,1); // No Packet Extended Timing Advance |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | #if 1 |
| 233 | bitvec_write_field(dest, wp,0x1,1); // Frequency Parameters information elements = present |
Holger Hans Peter Freyther | 8f399de | 2013-12-25 20:22:35 +0100 | [diff] [blame] | 234 | bitvec_write_field(dest, wp,tbf->tsc(),3); // Training Sequence Code (TSC) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 235 | bitvec_write_field(dest, wp,0x0,2); // ARFCN = present |
Holger Hans Peter Freyther | fc498c9 | 2013-10-27 13:38:54 +0100 | [diff] [blame] | 236 | bitvec_write_field(dest, wp,tbf->trx->arfcn,10); // ARFCN |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 237 | #else |
| 238 | bitvec_write_field(dest, wp,0x0,1); // Frequency Parameters = off |
| 239 | #endif |
| 240 | |
| 241 | bitvec_write_field(dest, wp,0x1,2); // Dynamic Allocation |
Jacob Erlbeck | edfd7e3 | 2015-11-17 16:30:58 +0100 | [diff] [blame] | 242 | |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 243 | bitvec_write_field(dest, wp,0x0,1); // Extended Dynamic Allocation = off |
| 244 | bitvec_write_field(dest, wp,0x0,1); // P0 = off |
Jacob Erlbeck | edfd7e3 | 2015-11-17 16:30:58 +0100 | [diff] [blame] | 245 | |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 246 | bitvec_write_field(dest, wp,0x0,1); // USF_GRANULARITY |
| 247 | bitvec_write_field(dest, wp,0x1,1); // switch TFI : on |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 248 | bitvec_write_field(dest, wp,tbf->tfi(),5);// TFI |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 249 | |
| 250 | bitvec_write_field(dest, wp,0x0,1); // |
| 251 | bitvec_write_field(dest, wp,0x0,1); // TBF Starting Time = off |
| 252 | if (alpha || gamma) { |
| 253 | bitvec_write_field(dest, wp,0x1,1); // Timeslot Allocation with Power Control |
| 254 | bitvec_write_field(dest, wp,alpha,4); // ALPHA |
| 255 | } else |
| 256 | bitvec_write_field(dest, wp,0x0,1); // Timeslot Allocation |
Jacob Erlbeck | edfd7e3 | 2015-11-17 16:30:58 +0100 | [diff] [blame] | 257 | |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 258 | for (ts = 0; ts < 8; ts++) { |
| 259 | if (tbf->pdch[ts]) { |
| 260 | bitvec_write_field(dest, wp,0x1,1); // USF_TN(i): on |
Daniel Willmann | 7e994e3 | 2014-08-07 15:49:21 +0200 | [diff] [blame] | 261 | bitvec_write_field(dest, wp,tbf->m_usf[ts],3); // USF_TN(i) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 262 | if (alpha || gamma) |
| 263 | bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| 264 | } else |
| 265 | bitvec_write_field(dest, wp,0x0,1); // USF_TN(i): off |
| 266 | } |
Jacob Erlbeck | edfd7e3 | 2015-11-17 16:30:58 +0100 | [diff] [blame] | 267 | // bitvec_write_field(dest, wp,0x0,1); // Measurement Mapping struct not present |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 268 | } |
| 269 | |
| 270 | |
| 271 | /* generate downlink assignment */ |
Jacob Erlbeck | 166c9fc | 2016-01-07 16:04:29 +0100 | [diff] [blame^] | 272 | void Encoding::write_packet_downlink_assignment(RlcMacDownlink_t * block, |
| 273 | uint8_t old_tfi, uint8_t old_downlink, struct gprs_rlcmac_tbf *tbf, |
| 274 | uint8_t poll, uint8_t alpha, uint8_t gamma, int8_t ta_idx, uint8_t ta_ts, |
| 275 | bool use_egprs) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 276 | { |
| 277 | // Packet downlink assignment TS 44.060 11.2.7 |
| 278 | |
Jacob Erlbeck | 166c9fc | 2016-01-07 16:04:29 +0100 | [diff] [blame^] | 279 | PDA_AdditionsR99_t *pda_r99; |
| 280 | |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 281 | uint8_t tn; |
| 282 | |
| 283 | block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header |
| 284 | block->RRBP = 0x0; // N+13 |
| 285 | block->SP = poll; // RRBP field is valid |
| 286 | block->USF = 0x0; // Uplink state flag |
| 287 | |
| 288 | block->u.Packet_Downlink_Assignment.MESSAGE_TYPE = 0x2; // Packet Downlink Assignment |
| 289 | block->u.Packet_Downlink_Assignment.PAGE_MODE = 0x0; // Normal Paging |
| 290 | |
| 291 | block->u.Packet_Downlink_Assignment.Exist_PERSISTENCE_LEVEL = 0x0; // PERSISTENCE_LEVEL: off |
| 292 | |
| 293 | block->u.Packet_Downlink_Assignment.ID.UnionType = 0x0; // TFI = on |
| 294 | block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.UnionType = old_downlink; // 0=UPLINK TFI, 1=DL TFI |
| 295 | block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.u.UPLINK_TFI = old_tfi; // TFI |
| 296 | |
| 297 | block->u.Packet_Downlink_Assignment.MAC_MODE = 0x0; // Dynamic Allocation |
| 298 | block->u.Packet_Downlink_Assignment.RLC_MODE = 0x0; // RLC acknowledged mode |
Daniel Willmann | 73191a4 | 2014-05-30 17:58:00 +0200 | [diff] [blame] | 299 | 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] | 300 | block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION = 0; // timeslot(s) |
| 301 | for (tn = 0; tn < 8; tn++) { |
| 302 | if (tbf->pdch[tn]) |
| 303 | block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION |= 0x80 >> tn; // timeslot(s) |
| 304 | } |
| 305 | |
| 306 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_TIMING_ADVANCE_VALUE = 0x1; // TIMING_ADVANCE_VALUE = on |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 307 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_VALUE = tbf->ta(); // TIMING_ADVANCE_VALUE |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 308 | if (ta_idx < 0) { |
| 309 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x0; // TIMING_ADVANCE_INDEX = off |
| 310 | } else { |
| 311 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x1; // TIMING_ADVANCE_INDEX = on |
| 312 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_INDEX = ta_idx; // TIMING_ADVANCE_INDEX |
| 313 | block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_TIMESLOT_NUMBER = ta_ts; // TIMING_ADVANCE_TS |
| 314 | } |
| 315 | |
| 316 | block->u.Packet_Downlink_Assignment.Exist_P0_and_BTS_PWR_CTRL_MODE = 0x0; // POWER CONTROL = off |
| 317 | |
| 318 | block->u.Packet_Downlink_Assignment.Exist_Frequency_Parameters = 0x1; // Frequency Parameters = on |
Holger Hans Peter Freyther | 8f399de | 2013-12-25 20:22:35 +0100 | [diff] [blame] | 319 | block->u.Packet_Downlink_Assignment.Frequency_Parameters.TSC = tbf->tsc(); // Training Sequence Code (TSC) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 320 | block->u.Packet_Downlink_Assignment.Frequency_Parameters.UnionType = 0x0; // ARFCN = on |
Holger Hans Peter Freyther | fc498c9 | 2013-10-27 13:38:54 +0100 | [diff] [blame] | 321 | block->u.Packet_Downlink_Assignment.Frequency_Parameters.u.ARFCN = tbf->trx->arfcn; // ARFCN |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 322 | |
| 323 | 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] | 324 | 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] | 325 | |
| 326 | block->u.Packet_Downlink_Assignment.Exist_Power_Control_Parameters = 0x1; // Power Control Parameters = on |
| 327 | block->u.Packet_Downlink_Assignment.Power_Control_Parameters.ALPHA = alpha; // ALPHA |
| 328 | |
| 329 | for (tn = 0; tn < 8; tn++) |
| 330 | { |
| 331 | if (tbf->pdch[tn]) |
| 332 | { |
| 333 | block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x1; // Slot[i] = on |
| 334 | block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].GAMMA_TN = gamma; // GAMMA_TN |
| 335 | } |
| 336 | else |
| 337 | { |
| 338 | block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x0; // Slot[i] = off |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | block->u.Packet_Downlink_Assignment.Exist_TBF_Starting_Time = 0x0; // TBF Starting TIME = off |
| 343 | block->u.Packet_Downlink_Assignment.Exist_Measurement_Mapping = 0x0; // Measurement_Mapping = off |
Jacob Erlbeck | 166c9fc | 2016-01-07 16:04:29 +0100 | [diff] [blame^] | 344 | if (!use_egprs) { |
| 345 | block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off |
| 346 | return; |
| 347 | } |
| 348 | block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x1; // AdditionsR99 = on |
| 349 | pda_r99 = &block->u.Packet_Downlink_Assignment.AdditionsR99; |
| 350 | pda_r99->Exist_EGPRS_Params = 1; |
| 351 | pda_r99->EGPRS_WindowSize = 0; /* 64, see TS 44.060, table 12.5.2.1 */ |
| 352 | pda_r99->LINK_QUALITY_MEASUREMENT_MODE = 0x0; /* no meas, see TS 44.060, table 11.2.7.2 */ |
| 353 | pda_r99->Exist_BEP_PERIOD2 = 0; /* No extra EGPRS BEP PERIOD */ |
| 354 | pda_r99->Exist_Packet_Extended_Timing_Advance = 0; |
| 355 | pda_r99->Exist_COMPACT_ReducedMA = 0; |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | /* generate paging request */ |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 359 | int Encoding::write_paging_request(bitvec * dest, uint8_t *ptmsi, uint16_t ptmsi_len) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 360 | { |
| 361 | unsigned wp = 0; |
| 362 | int plen; |
| 363 | |
| 364 | bitvec_write_field(dest, wp,0x0,4); // Skip Indicator |
| 365 | bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator |
| 366 | bitvec_write_field(dest, wp,0x21,8); // Paging Request Message Type |
| 367 | |
| 368 | bitvec_write_field(dest, wp,0x0,4); // Page Mode |
| 369 | bitvec_write_field(dest, wp,0x0,4); // Channel Needed |
| 370 | |
| 371 | // Mobile Identity |
| 372 | bitvec_write_field(dest, wp,ptmsi_len+1,8); // Mobile Identity length |
| 373 | bitvec_write_field(dest, wp,0xf,4); // unused |
| 374 | bitvec_write_field(dest, wp,0x4,4); // PTMSI type |
| 375 | for (int i = 0; i < ptmsi_len; i++) |
| 376 | { |
| 377 | bitvec_write_field(dest, wp,ptmsi[i],8); // PTMSI |
| 378 | } |
| 379 | if ((wp % 8)) { |
| 380 | LOGP(DRLCMACUL, LOGL_ERROR, "Length of PAG.REQ without rest " |
| 381 | "octets is not multiple of 8 bits, PLEASE FIX!\n"); |
| 382 | exit (0); |
| 383 | } |
| 384 | plen = wp / 8; |
| 385 | bitvec_write_field(dest, wp,0x0,1); // "L" NLN(PCH) = off |
| 386 | bitvec_write_field(dest, wp,0x0,1); // "L" Priority1 = off |
| 387 | bitvec_write_field(dest, wp,0x1,1); // "L" Priority2 = off |
| 388 | bitvec_write_field(dest, wp,0x0,1); // "L" Group Call information = off |
| 389 | bitvec_write_field(dest, wp,0x0,1); // "H" Packet Page Indication 1 = packet paging procedure |
| 390 | bitvec_write_field(dest, wp,0x1,1); // "H" Packet Page Indication 2 = packet paging procedure |
| 391 | |
| 392 | return plen; |
| 393 | } |
| 394 | |
Daniel Willmann | 5241c1a | 2013-12-11 14:35:29 +0100 | [diff] [blame] | 395 | /** |
| 396 | * The index of the array show_rbb is the bit position inside the rbb |
| 397 | * (show_rbb[63] relates to BSN ssn-1) |
| 398 | */ |
| 399 | void Encoding::encode_rbb(const char *show_rbb, uint8_t *rbb) |
| 400 | { |
| 401 | uint8_t rbb_byte = 0; |
| 402 | |
| 403 | // RECEIVE_BLOCK_BITMAP |
| 404 | for (int i = 0; i < 64; i++) { |
| 405 | /* Set bit at the appropriate position (see 3GPP TS 04.60 9.1.8.1) */ |
| 406 | if (show_rbb[i] == 'R') |
| 407 | rbb_byte |= 1<< (7-(i%8)); |
| 408 | |
| 409 | if((i%8) == 7) { |
| 410 | rbb[i/8] = rbb_byte; |
| 411 | rbb_byte = 0; |
| 412 | } |
| 413 | } |
| 414 | } |
| 415 | |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 416 | static void write_packet_ack_nack_desc_gprs( |
| 417 | struct gprs_rlcmac_bts *bts, bitvec * dest, unsigned& wp, |
| 418 | gprs_rlc_ul_window *window, bool is_final) |
| 419 | { |
| 420 | char rbb[65]; |
| 421 | |
| 422 | window->update_rbb(rbb); |
| 423 | |
| 424 | rbb[64] = 0; |
| 425 | LOGP(DRLCMACUL, LOGL_DEBUG, "- V(N): \"%s\" R=Received " |
| 426 | "I=Invalid\n", rbb); |
| 427 | |
| 428 | bitvec_write_field(dest, wp, is_final, 1); // FINAL_ACK_INDICATION |
| 429 | bitvec_write_field(dest, wp, window->ssn(), 7); // STARTING_SEQUENCE_NUMBER |
| 430 | |
| 431 | for (int i = 0; i < 64; i++) { |
| 432 | /* Set bit at the appropriate position (see 3GPP TS 04.60 9.1.8.1) */ |
| 433 | bool is_ack = (rbb[i] == 'R'); |
| 434 | bitvec_write_field(dest, wp, is_ack, 1); |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | static void write_packet_uplink_ack_gprs( |
| 439 | struct gprs_rlcmac_bts *bts, bitvec * dest, unsigned& wp, |
| 440 | struct gprs_rlcmac_ul_tbf *tbf, bool is_final) |
| 441 | { |
| 442 | |
Jacob Erlbeck | cb72890 | 2016-01-05 15:33:03 +0100 | [diff] [blame] | 443 | bitvec_write_field(dest, wp, tbf->current_cs().to_num() - 1, 2); // CHANNEL_CODING_COMMAND |
Jacob Erlbeck | 37005a1 | 2015-12-22 14:58:34 +0100 | [diff] [blame] | 444 | write_packet_ack_nack_desc_gprs(bts, dest, wp, &tbf->m_window, is_final); |
| 445 | |
| 446 | bitvec_write_field(dest, wp, 1, 1); // 1: have CONTENTION_RESOLUTION_TLLI |
| 447 | bitvec_write_field(dest, wp, tbf->tlli(), 32); // CONTENTION_RESOLUTION_TLLI |
| 448 | |
| 449 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have Packet Timing Advance |
| 450 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have Power Control Parameters |
| 451 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have Extension Bits |
| 452 | bitvec_write_field(dest, wp, 0, 1); // fixed 0 |
| 453 | bitvec_write_field(dest, wp, 1, 1); // 1: have Additions R99 |
| 454 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have Packet Extended Timing Advance |
| 455 | bitvec_write_field(dest, wp, 1, 1); // TBF_EST (enabled) |
| 456 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have REL 5 |
| 457 | }; |
| 458 | |
| 459 | static void write_packet_ack_nack_desc_egprs( |
| 460 | struct gprs_rlcmac_bts *bts, bitvec * dest, unsigned& wp, |
| 461 | gprs_rlc_ul_window *window, bool is_final) |
| 462 | { |
| 463 | int urbb_len = 0; |
| 464 | int crbb_len = 0; |
| 465 | int len; |
| 466 | bool bow = true; |
| 467 | bool eow = true; |
| 468 | int ssn = window->mod_sns(window->v_q() + 1); |
| 469 | int num_blocks = window->mod_sns(window->v_r() - window->v_q()); |
| 470 | int esn_crbb = window->mod_sns(ssn - 1); |
| 471 | int rest_bits = dest->data_len * 8 - wp; |
| 472 | |
| 473 | if (num_blocks > 0) |
| 474 | /* V(Q) is NACK and omitted -> SSN = V(Q) + 1 */ |
| 475 | num_blocks -= 1; |
| 476 | |
| 477 | if (num_blocks > window->ws()) |
| 478 | num_blocks = window->ws(); |
| 479 | |
| 480 | if (num_blocks > rest_bits) { |
| 481 | eow = false; |
| 482 | urbb_len = rest_bits; |
| 483 | /* TODO: use compression, start encoding bits and stop when the |
| 484 | * space is exhausted. Use the first combination that encodes |
| 485 | * all bits. If there is none, use the combination that encodes |
| 486 | * the largest number of bits (e.g. by setting num_blocks to the |
| 487 | * max and repeating the construction). |
| 488 | */ |
| 489 | } else if (num_blocks > rest_bits - 9) { |
| 490 | /* union bit and length field take 9 bits */ |
| 491 | eow = false; |
| 492 | urbb_len = rest_bits - 9; |
| 493 | /* TODO: use compression (see above) */ |
| 494 | } |
| 495 | |
| 496 | if (urbb_len + crbb_len == rest_bits) |
| 497 | len = -1; |
| 498 | else if (crbb_len == 0) |
| 499 | len = urbb_len + 15; |
| 500 | else |
| 501 | len = urbb_len + crbb_len + 23; |
| 502 | |
| 503 | /* EGPRS Ack/Nack Description IE */ |
| 504 | if (len < 0) { |
| 505 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have length |
| 506 | } else { |
| 507 | bitvec_write_field(dest, wp, 1, 1); // 1: have length |
| 508 | bitvec_write_field(dest, wp, len, 8); // length |
| 509 | } |
| 510 | |
| 511 | bitvec_write_field(dest, wp, is_final, 1); // FINAL_ACK_INDICATION |
| 512 | bitvec_write_field(dest, wp, bow, 1); // BEGINNING_OF_WINDOW |
| 513 | bitvec_write_field(dest, wp, eow, 1); // END_OF_WINDOW |
| 514 | bitvec_write_field(dest, wp, ssn, 11); // STARTING_SEQUENCE_NUMBER |
| 515 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have CRBB |
| 516 | |
| 517 | /* TODO: Add CRBB support */ |
| 518 | |
| 519 | LOGP(DRLCMACUL, LOGL_DEBUG, |
| 520 | " - EGPRS URBB, len = %d, SSN = %d, ESN_CRBB = %d, " |
| 521 | "SNS = %d, WS = %d, V(Q) = %d, V(R) = %d%s%s\n", |
| 522 | urbb_len, ssn, esn_crbb, |
| 523 | window->sns(), window->ws(), window->v_q(), window->v_r(), |
| 524 | bow ? ", BOW" : "", eow ? ", EOW" : ""); |
| 525 | for (int i = urbb_len; i > 0; i--) { |
| 526 | /* Set bit at the appropriate position (see 3GPP TS 04.60 12.3.1) */ |
| 527 | bool is_ack = window->m_v_n.is_received(esn_crbb + i); |
| 528 | bitvec_write_field(dest, wp, is_ack, 1); |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | static void write_packet_uplink_ack_egprs( |
| 533 | struct gprs_rlcmac_bts *bts, bitvec * dest, unsigned& wp, |
| 534 | struct gprs_rlcmac_ul_tbf *tbf, bool is_final) |
| 535 | { |
| 536 | bitvec_write_field(dest, wp, 0, 2); // fixed 00 |
| 537 | bitvec_write_field(dest, wp, 2, 4); // CHANNEL_CODING_COMMAND: MCS-3 |
| 538 | // bitvec_write_field(dest, wp, tbf->current_cs() - 1, 4); // CHANNEL_CODING_COMMAND |
| 539 | bitvec_write_field(dest, wp, 0, 1); // 0: no RESEGMENT (nyi) |
| 540 | bitvec_write_field(dest, wp, 1, 1); // PRE_EMPTIVE_TRANSMISSION, TODO: This resembles GPRS, change it? |
| 541 | bitvec_write_field(dest, wp, 0, 1); // 0: no PRR_RETRANSMISSION_REQUEST, TODO: clarify |
| 542 | bitvec_write_field(dest, wp, 0, 1); // 0: no ARAC_RETRANSMISSION_REQUEST, TODO: clarify |
| 543 | bitvec_write_field(dest, wp, 1, 1); // 1: have CONTENTION_RESOLUTION_TLLI |
| 544 | bitvec_write_field(dest, wp, tbf->tlli(), 32); // CONTENTION_RESOLUTION_TLLI |
| 545 | bitvec_write_field(dest, wp, 1, 1); // TBF_EST (enabled) |
| 546 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have Packet Timing Advance |
| 547 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have Packet Extended Timing Advance |
| 548 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have Power Control Parameters |
| 549 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have Extension Bits |
| 550 | |
| 551 | write_packet_ack_nack_desc_egprs(bts, dest, wp, &tbf->m_window, is_final); |
| 552 | |
| 553 | bitvec_write_field(dest, wp, 0, 1); // fixed 0 |
| 554 | bitvec_write_field(dest, wp, 0, 1); // 0: don't have REL 5 |
| 555 | }; |
| 556 | |
| 557 | void Encoding::write_packet_uplink_ack( |
| 558 | struct gprs_rlcmac_bts *bts, bitvec * dest, |
| 559 | struct gprs_rlcmac_ul_tbf *tbf, bool is_final) |
| 560 | { |
| 561 | unsigned wp = 0; |
| 562 | |
| 563 | LOGP(DRLCMACUL, LOGL_DEBUG, "Encoding Ack/Nack for %s " |
| 564 | "(final=%d)\n", tbf_name(tbf), is_final); |
| 565 | |
| 566 | bitvec_write_field(dest, wp, 0x1, 2); // Payload Type |
| 567 | bitvec_write_field(dest, wp, 0x0, 2); // Uplink block with TDMA framenumber (N+13) |
| 568 | bitvec_write_field(dest, wp, is_final, 1); // Suppl/Polling Bit |
| 569 | bitvec_write_field(dest, wp, 0x0, 3); // Uplink state flag |
| 570 | bitvec_write_field(dest, wp, 0x9, 6); // MESSAGE TYPE Uplink Ack/Nack |
| 571 | bitvec_write_field(dest, wp, 0x0, 2); // Page Mode |
| 572 | |
| 573 | bitvec_write_field(dest, wp, 0x0, 2); // fixed 00 |
| 574 | bitvec_write_field(dest, wp, tbf->tfi(), 5); // Uplink TFI |
| 575 | |
| 576 | if (tbf->is_egprs_enabled()) { |
| 577 | /* PU_AckNack_EGPRS = on */ |
| 578 | bitvec_write_field(dest, wp, 1, 1); // 1: EGPRS |
| 579 | write_packet_uplink_ack_egprs(bts, dest, wp, tbf, is_final); |
| 580 | } else { |
| 581 | /* PU_AckNack_GPRS = on */ |
| 582 | bitvec_write_field(dest, wp, 0, 1); // 0: GPRS |
| 583 | write_packet_uplink_ack_gprs(bts, dest, wp, tbf, is_final); |
| 584 | } |
| 585 | |
| 586 | LOGP(DRLCMACUL, LOGL_DEBUG, |
| 587 | "Uplink Ack/Nack bit count %d, max %d, message = %s\n", |
| 588 | wp, dest->data_len * 8, |
| 589 | osmo_hexdump(dest->data, dest->data_len)); |
| 590 | } |
| 591 | |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 592 | unsigned Encoding::write_packet_paging_request(bitvec * dest) |
Holger Hans Peter Freyther | 6ca0a90 | 2013-10-19 18:50:22 +0200 | [diff] [blame] | 593 | { |
| 594 | unsigned wp = 0; |
| 595 | |
| 596 | bitvec_write_field(dest, wp,0x1,2); // Payload Type |
| 597 | bitvec_write_field(dest, wp,0x0,3); // No polling |
| 598 | bitvec_write_field(dest, wp,0x0,3); // Uplink state flag |
| 599 | bitvec_write_field(dest, wp,0x22,6); // MESSAGE TYPE |
| 600 | |
| 601 | bitvec_write_field(dest, wp,0x0,2); // Page Mode |
| 602 | |
| 603 | bitvec_write_field(dest, wp,0x0,1); // No PERSISTENCE_LEVEL |
| 604 | bitvec_write_field(dest, wp,0x0,1); // No NLN |
| 605 | |
| 606 | return wp; |
| 607 | } |
| 608 | |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 609 | 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] | 610 | uint8_t *identity, uint8_t chan_needed) |
| 611 | { |
| 612 | bitvec_write_field(dest, wp,0x1,1); // Repeated Page info exists |
| 613 | |
| 614 | bitvec_write_field(dest, wp,0x1,1); // RR connection paging |
| 615 | |
| 616 | if ((identity[0] & 0x07) == 4) { |
| 617 | bitvec_write_field(dest, wp,0x0,1); // TMSI |
| 618 | identity++; |
| 619 | len--; |
| 620 | } else { |
| 621 | bitvec_write_field(dest, wp,0x0,1); // MI |
| 622 | bitvec_write_field(dest, wp,len,4); // MI len |
| 623 | } |
| 624 | while (len) { |
| 625 | bitvec_write_field(dest, wp,*identity++,8); // MI data |
| 626 | len--; |
| 627 | } |
| 628 | bitvec_write_field(dest, wp,chan_needed,2); // CHANNEL_NEEDED |
| 629 | bitvec_write_field(dest, wp,0x0,1); // No eMLPP_PRIORITY |
| 630 | |
| 631 | return wp; |
| 632 | } |
| 633 | |