Max | 51754b6 | 2019-03-13 17:14:13 +0100 | [diff] [blame] | 1 | /* coding_scheme.c |
| 2 | * |
| 3 | * Copyright (C) 2019 by sysmocom s.f.m.c. GmbH |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; either version 2 |
| 8 | * of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | #include <stdint.h> |
| 21 | #include <stdbool.h> |
| 22 | |
| 23 | #include <osmocom/core/utils.h> |
| 24 | |
| 25 | #include "coding_scheme.h" |
| 26 | |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 27 | const struct value_string mcs_names[] = { |
| 28 | { UNKNOWN, "UNKNOWN" }, |
| 29 | { CS1, "CS-1" }, |
| 30 | { CS2, "CS-2" }, |
| 31 | { CS3, "CS-3" }, |
| 32 | { CS4, "CS-4" }, |
| 33 | { MCS1, "MCS-1" }, |
| 34 | { MCS2, "MCS-2" }, |
| 35 | { MCS3, "MCS-3" }, |
| 36 | { MCS4, "MCS-4" }, |
| 37 | { MCS5, "MCS-5" }, |
| 38 | { MCS6, "MCS-6" }, |
| 39 | { MCS7, "MCS-7" }, |
| 40 | { MCS8, "MCS-8" }, |
| 41 | { MCS9, "MCS-9" }, |
| 42 | { 0, NULL } |
| 43 | }; |
| 44 | |
| 45 | const char *mcs_name(enum CodingScheme val) { |
| 46 | return get_value_string(mcs_names, val); |
| 47 | } |
| 48 | |
Max | 8a8e0fb | 2019-03-25 16:32:50 +0100 | [diff] [blame] | 49 | bool mcs_is_gprs(enum CodingScheme cs) |
| 50 | { |
| 51 | return CS1 <= cs && cs <= CS4; |
| 52 | } |
| 53 | |
| 54 | bool mcs_is_edge(enum CodingScheme cs) |
| 55 | { |
| 56 | return MCS1 <= cs && cs <= MCS9; |
| 57 | } |
| 58 | |
| 59 | bool mcs_is_edge_gmsk(enum CodingScheme cs) |
| 60 | { |
| 61 | if (mcs_is_edge(cs)) |
| 62 | return cs <= MCS4; |
| 63 | |
| 64 | return false; |
| 65 | } |
| 66 | |
Max | 898dddb | 2019-03-12 15:50:57 +0100 | [diff] [blame] | 67 | /* Return 3GPP TS 44.060 ยง12.10d (EDGE) or Table 11.2.28.2 (GPRS) Channel Coding Command value */ |
| 68 | uint8_t mcs_chan_code(enum CodingScheme cs) |
| 69 | { |
| 70 | if (mcs_is_gprs(cs)) |
| 71 | return cs - CS1; |
| 72 | |
| 73 | if (mcs_is_edge(cs)) |
| 74 | return cs - MCS1; |
| 75 | |
| 76 | /* Defaults to (M)CS1 */ |
| 77 | return 0; |
| 78 | } |
| 79 | |
Max | 51754b6 | 2019-03-13 17:14:13 +0100 | [diff] [blame] | 80 | static struct { |
| 81 | struct { |
| 82 | uint8_t data_header_bits; |
| 83 | } uplink, downlink; |
| 84 | uint8_t data_block_header_bits; |
| 85 | uint8_t num_blocks; |
| 86 | const char *name; |
| 87 | } hdr_type_info[NUM_HEADER_TYPES] = { |
| 88 | { { 0 }, { 0 }, 0, 0, "INVALID" }, |
| 89 | { { 1 * 8 + 0 }, { 1 * 8 + 0 }, 0, 0, "CONTROL" }, |
| 90 | { { 3 * 8 + 0 }, { 3 * 8 + 0 }, 0, 1, "GPRS_DATA" }, |
| 91 | { { 5 * 8 + 6 }, { 5 * 8 + 0 }, 2, 2, "EGPRS_DATA_TYPE1" }, |
| 92 | { { 4 * 8 + 5 }, { 3 * 8 + 4 }, 2, 1, "EGPRS_DATA_TYPE2" }, |
| 93 | { { 3 * 8 + 7 }, { 3 * 8 + 7 }, 2, 1, "EGPRS_DATA_TYPE3" }, |
| 94 | }; |
| 95 | |
| 96 | uint8_t num_data_blocks(enum HeaderType ht) |
| 97 | { |
| 98 | OSMO_ASSERT(ht < NUM_HEADER_TYPES); |
| 99 | return hdr_type_info[ht].num_blocks; |
| 100 | } |
| 101 | |
| 102 | uint8_t num_data_header_bits_UL(enum HeaderType ht) |
| 103 | { |
| 104 | OSMO_ASSERT(ht < NUM_HEADER_TYPES); |
| 105 | return hdr_type_info[ht].uplink.data_header_bits; |
| 106 | } |
| 107 | |
| 108 | uint8_t num_data_header_bits_DL(enum HeaderType ht) |
| 109 | { |
| 110 | OSMO_ASSERT(ht < NUM_HEADER_TYPES); |
| 111 | return hdr_type_info[ht].downlink.data_header_bits; |
| 112 | } |
| 113 | |
| 114 | uint8_t num_data_block_header_bits(enum HeaderType ht) |
| 115 | { |
| 116 | OSMO_ASSERT(ht < NUM_HEADER_TYPES); |
| 117 | return hdr_type_info[ht].data_block_header_bits; |
| 118 | } |
Max | a4de02d | 2019-03-13 16:35:09 +0100 | [diff] [blame] | 119 | |
| 120 | const struct value_string mode_names[] = { |
| 121 | { GPRS, "GPRS" }, |
| 122 | { EGPRS_GMSK, "EGPRS_GMSK-only"}, |
| 123 | { EGPRS, "EGPRS"}, |
| 124 | { 0, NULL } |
| 125 | }; |
| 126 | |
| 127 | const char *mode_name(enum mcs_kind val) { |
| 128 | return get_value_string(mode_names, val); |
| 129 | } |
Max | 902e3e5 | 2019-03-25 16:38:53 +0100 | [diff] [blame] | 130 | |
| 131 | /* FIXME: take into account padding and special cases of commanded MCS (MCS-6-9 and MCS-5-7) */ |
| 132 | enum CodingScheme get_retx_mcs(enum CodingScheme initial_mcs, enum CodingScheme commanded_mcs, bool resegment_bit) |
| 133 | { |
| 134 | OSMO_ASSERT(mcs_is_edge(initial_mcs)); |
| 135 | OSMO_ASSERT(mcs_is_edge(commanded_mcs)); |
| 136 | OSMO_ASSERT(NUM_SCHEMES - MCS1 == 9); |
| 137 | |
| 138 | if (resegment_bit) { /* 3GPP TS 44.060 Table 8.1.1.1, reflected over antidiagonal */ |
| 139 | enum CodingScheme egprs_reseg[NUM_SCHEMES - MCS1][NUM_SCHEMES - MCS1] = { |
| 140 | { MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1 }, |
| 141 | { MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2 }, |
| 142 | { MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3 }, |
| 143 | { MCS1, MCS1, MCS1, MCS4, MCS4, MCS4, MCS4, MCS4, MCS4 }, |
| 144 | { MCS2, MCS2, MCS2, MCS2, MCS5, MCS5, MCS7, MCS7, MCS7 }, |
| 145 | { MCS3, MCS3, MCS3, MCS3, MCS3, MCS6, MCS6, MCS6, MCS9 }, |
| 146 | { MCS2, MCS2, MCS2, MCS2, MCS5, MCS5, MCS7, MCS7, MCS7 }, |
| 147 | { MCS3, MCS3, MCS3, MCS3, MCS3, MCS6, MCS6, MCS8, MCS8 }, |
| 148 | { MCS3, MCS3, MCS3, MCS3, MCS3, MCS6, MCS6, MCS6, MCS9 }, |
| 149 | }; |
| 150 | return egprs_reseg[mcs_chan_code(initial_mcs)][mcs_chan_code(commanded_mcs)]; |
| 151 | } else { /* 3GPP TS 44.060 Table 8.1.1.2, reflected over antidiagonal */ |
| 152 | enum CodingScheme egprs_no_reseg[NUM_SCHEMES - MCS1][NUM_SCHEMES - MCS1] = { |
| 153 | { MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1 }, |
| 154 | { MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2 }, |
| 155 | { MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3 }, |
| 156 | { MCS4, MCS4, MCS4, MCS4, MCS4, MCS4, MCS4, MCS4, MCS4 }, |
| 157 | { MCS5, MCS5, MCS5, MCS5, MCS5, MCS5, MCS7, MCS7, MCS7 }, |
| 158 | { MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS9 }, |
| 159 | { MCS5, MCS5, MCS5, MCS5, MCS5, MCS5, MCS7, MCS7, MCS7 }, |
| 160 | { MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS8, MCS8 }, |
| 161 | { MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS9 }, |
| 162 | }; |
| 163 | return egprs_no_reseg[mcs_chan_code(initial_mcs)][mcs_chan_code(commanded_mcs)]; |
| 164 | } |
| 165 | } |