diff options
26 files changed, 1111 insertions, 1314 deletions
diff --git a/src/osmo-bts-trx/Makefile.am b/src/osmo-bts-trx/Makefile.am index 94a050ce..d5021c92 100644 --- a/src/osmo-bts-trx/Makefile.am +++ b/src/osmo-bts-trx/Makefile.am @@ -2,10 +2,10 @@ INCLUDES = $(all_includes) -I$(top_srcdir)/include -I$(OPENBSC_INCDIR) AM_CFLAGS = -Wall -fno-strict-aliasing $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(LIBOSMOTRAU_CFLAGS) $(LIBOSMOABIS_CFLAGS) LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOVTY_LIBS) $(LIBOSMOTRAU_LIBS) $(LIBOSMOABIS_LIBS) -lortp -EXTRA_DIST = trx_if.h l1_if.h scheduler.h xcch.h rach.h sch.h pxxch.h tch_fr.h +EXTRA_DIST = trx_if.h l1_if.h scheduler.h gsm0503_parity.h gsm0503_conv.h gsm0503_interleaving.h gsm0503_mapping.h gsm0503_coding.h gsm0503_tables.h bin_PROGRAMS = osmobts-trx -osmobts_trx_SOURCES = main.c trx_if.c l1_if.c scheduler.c trx_vty.c xcch.c rach.c sch.c pxxch.c tch_fr.c +osmobts_trx_SOURCES = main.c trx_if.c l1_if.c scheduler.c trx_vty.c gsm0503_parity.c gsm0503_conv.c gsm0503_interleaving.c gsm0503_mapping.c gsm0503_coding.c gsm0503_tables.c osmobts_trx_LDADD = $(top_builddir)/src/common/libbts.a $(LDADD) diff --git a/src/osmo-bts-trx/gsm0503_coding.c b/src/osmo-bts-trx/gsm0503_coding.c new file mode 100644 index 00000000..2d3f7705 --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_coding.c @@ -0,0 +1,571 @@ + +#include <stdio.h> +#include <stdint.h> +#include <string.h> +#include <stdlib.h> + +#include <osmocom/core/bits.h> +#include <osmocom/core/conv.h> +#include <osmocom/core/crcgen.h> + +#include "gsm0503_conv.h" +#include "gsm0503_parity.h" +#include "gsm0503_mapping.h" +#include "gsm0503_interleaving.h" +#include "gsm0503_tables.h" +#include "gsm0503_coding.h" + +static int _xcch_decode_cB(uint8_t *l2_data, sbit_t *cB) +{ + ubit_t conv[224]; + int rv; + + osmo_conv_decode(&gsm0503_conv_xcch, cB, conv); + + rv = osmo_crc64gen_check_bits(&gsm0503_fire_crc40, conv, 184, conv+184); + if (rv) + return -1; + + osmo_ubit2pbit_ext(l2_data, 0, conv, 0, 184, 1); + + return 0; +} + +static int _xcch_encode_cB(ubit_t *cB, uint8_t *l2_data) +{ + ubit_t conv[224]; + + osmo_pbit2ubit_ext(conv, 0, l2_data, 0, 184, 1); + + osmo_crc64gen_set_bits(&gsm0503_fire_crc40, conv, 184, conv+184); + + osmo_conv_encode(&gsm0503_conv_xcch, conv, cB); + + return 0; +} + + +/* + * GSM xCCH block transcoding + */ + +int xcch_decode(uint8_t *l2_data, sbit_t *bursts) +{ + sbit_t iB[456], cB[456]; + int i; + + for (i=0; i<4; i++) + gsm0503_xcch_burst_unmap(&iB[i * 114], &bursts[i * 116], NULL, + NULL); + + gsm0503_xcch_deinterleave(cB, iB); + + return _xcch_decode_cB(l2_data, cB); +} + +int xcch_encode(ubit_t *bursts, uint8_t *l2_data) +{ + ubit_t iB[456], cB[456], hl = 1, hn = 1; + int i; + + _xcch_encode_cB(cB, l2_data); + + gsm0503_xcch_interleave(cB, iB); + + for (i=0; i<4; i++) + gsm0503_xcch_burst_map(&iB[i * 114], &bursts[i * 116], &hl, + &hn); + + return 0; +} + + +/* + * GSM PDTCH block transcoding + */ + +int pdtch_decode(uint8_t *l2_data, sbit_t *bursts, uint8_t *usf_p) +{ + sbit_t iB[456], cB[676], hl_hn[8]; + ubit_t conv[456]; + int i, j, k, rv, best = 0, cs = 0, usf = 0; /* make GCC happy */ + + for (i=0; i<4; i++) + gsm0503_xcch_burst_unmap(&iB[i * 114], &bursts[i * 116], + hl_hn + i*2, hl_hn + i*2 + 1); + + for (i=0; i<4; i++) { + for (j=0, k=0; j<8; j++) + k += abs(((int)gsm0503_pdtch_hl_hn_sbit[i][j]) - + ((int)hl_hn[j])); + if (i == 0 || k < best) { + best = k; + cs = i+1; + } + } + + gsm0503_xcch_deinterleave(cB, iB); + + switch (cs) { + case 1: + osmo_conv_decode(&gsm0503_conv_xcch, cB, conv); + + rv = osmo_crc64gen_check_bits(&gsm0503_fire_crc40, conv, 184, + conv+184); + if (rv) + return -1; + + osmo_ubit2pbit_ext(l2_data, 0, conv, 0, 184, 1); + + return 23; + case 2: + for (i=587, j=455; i>=0; i--) + if (!gsm0503_puncture_cs2[i]) + cB[i] = cB[j--]; + else + cB[i] = 0; + + osmo_conv_decode(&gsm0503_conv_cs2, cB, conv); + + for (i=0; i<8; i++) { + for (j=0, k=0; j<6; j++) + k += abs(((int)gsm0503_usf2six[i][j]) - + ((int)conv[j])); + if (i == 0 || k < best) { + best = k; + usf = i; + } + } + + conv[3] = usf & 1; + conv[4] = (usf >> 1) & 1; + conv[5] = (usf >> 2) & 1; + if (usf_p) + *usf_p = usf; + + rv = osmo_crc16gen_check_bits(&gsm0503_cs234_crc16, conv+3, 271, + conv+3+271); + if (rv) + return -1; + + osmo_ubit2pbit_ext(l2_data, 0, conv, 3, 271, 1); + + return 34; + case 3: + for (i=675, j=455; i>=0; i--) + if (!gsm0503_puncture_cs3[i]) + cB[i] = cB[j--]; + else + cB[i] = 0; + + osmo_conv_decode(&gsm0503_conv_cs3, cB, conv); + + for (i=0; i<8; i++) { + for (j=0, k=0; j<6; j++) + k += abs(((int)gsm0503_usf2six[i][j]) - + ((int)conv[j])); + if (i == 0 || k < best) { + best = k; + usf = i; + } + } + + conv[3] = usf & 1; + conv[4] = (usf >> 1) & 1; + conv[5] = (usf >> 2) & 1; + if (usf_p) + *usf_p = usf; + + rv = osmo_crc16gen_check_bits(&gsm0503_cs234_crc16, conv+3, 315, + conv+3+315); + if (rv) + return -1; + + osmo_ubit2pbit_ext(l2_data, 0, conv, 3, 315, 1); + + return 40; + case 4: + for (i=12; i<456;i++) + conv[i] = (cB[i] < 0) ? 1:0; + + for (i=0; i<8; i++) { + for (j=0, k=0; j<12; j++) + k += abs(((int)gsm0503_usf2twelve_sbit[i][j]) - + ((int)cB[j])); + if (i == 0 || k < best) { + best = k; + usf = i; + } + } + + conv[9] = usf & 1; + conv[10] = (usf >> 1) & 1; + conv[11] = (usf >> 2) & 1; + if (usf_p) + *usf_p = usf; + + rv = osmo_crc16gen_check_bits(&gsm0503_cs234_crc16, conv+9, 431, + conv+9+431); + if (rv) + return -1; + + osmo_ubit2pbit_ext(l2_data, 0, conv, 9, 431, 1); + + return 54; + } + + return -1; +} + +int pdtch_encode(ubit_t *bursts, uint8_t *l2_data, uint8_t l2_len) +{ + ubit_t iB[456], cB[676]; + const ubit_t *hl_hn; + ubit_t conv[334]; + int i, j, usf; + + switch (l2_len) { + case 23: + osmo_pbit2ubit_ext(conv, 0, l2_data, 0, 184, 1); + + osmo_crc64gen_set_bits(&gsm0503_fire_crc40, conv, 184, + conv+184); + + osmo_conv_encode(&gsm0503_conv_xcch, conv, cB); + + hl_hn = gsm0503_pdtch_hl_hn_ubit[0]; + + break; + case 34: + osmo_pbit2ubit_ext(conv, 3, l2_data, 0, 271, 1); + usf = l2_data[0] & 0x7; + + osmo_crc16gen_set_bits(&gsm0503_cs234_crc16, conv+3, 271, + conv+3+271); + + memcpy(conv, gsm0503_usf2six[usf], 6); + + osmo_conv_encode(&gsm0503_conv_cs2, conv, cB); + + for (i=0, j=0; i<588; i++) + if (!gsm0503_puncture_cs2[i]) + cB[j++] = cB[i]; + + hl_hn = gsm0503_pdtch_hl_hn_ubit[1]; + + break; + case 40: + osmo_pbit2ubit_ext(conv, 3, l2_data, 0, 315, 1); + usf = l2_data[0] & 0x7; + + osmo_crc16gen_set_bits(&gsm0503_cs234_crc16, conv+3, 315, + conv+3+315); + + memcpy(conv, gsm0503_usf2six[usf], 6); + + osmo_conv_encode(&gsm0503_conv_cs3, conv, cB); + + for (i=0, j=0; i<676; i++) + if (!gsm0503_puncture_cs3[i]) + cB[j++] = cB[i]; + + hl_hn = gsm0503_pdtch_hl_hn_ubit[2]; + + break; + case 54: + osmo_pbit2ubit_ext(cB, 9, l2_data, 0, 431, 1); + usf = l2_data[0] & 0x7; + + osmo_crc16gen_set_bits(&gsm0503_cs234_crc16, cB+9, 431, + cB+9+431); + + memcpy(cB, gsm0503_usf2twelve_ubit[usf], 12); + + hl_hn = gsm0503_pdtch_hl_hn_ubit[3]; + + break; + default: + return -1; + } + + gsm0503_xcch_interleave(cB, iB); + + for (i=0; i<4; i++) + gsm0503_xcch_burst_map(&iB[i * 114], &bursts[i * 116], + hl_hn + i*2, hl_hn + i*2 + 1); + + return 0; +} + + +/* + * GSM TCH/F FR transcoding + */ + +static void tch_fr_reassemble(uint8_t *tch_data, ubit_t *b_bits) +{ + int i, j, k, l, o; + + tch_data[0] = 0xd << 4; + memset(tch_data + 1, 0, 32); + /* reassemble d-bits */ + i = 0; /* counts bits */ + j = 4; /* counts output bits */ + k = gsm0503_gsm_fr_map[0]-1; /* current number bit in element */ + l = 0; /* counts element bits */ + o = 0; /* offset input bits */ + while (i < 260) { + tch_data[j>>3] |= (b_bits[k+o] << (7-(j&7))); + if (--k < 0) { + o += gsm0503_gsm_fr_map[l]; + k = gsm0503_gsm_fr_map[++l]-1; + } + i++; + j++; + } + + /* rearrange according to Table 2 of TS 05.03 */ +} + +static void tch_fr_disassemble(ubit_t *b_bits, uint8_t *tch_data) +{ + int i, j, k, l, o; + + i = 0; /* counts bits */ + j = 4; /* counts input bits */ + k = gsm0503_gsm_fr_map[0]-1; /* current number bit in element */ + l = 0; /* counts element bits */ + o = 0; /* offset output bits */ + while (i < 260) { + b_bits[k+o] = (tch_data[j>>3] >> (7-(j&7))) & 1; + if (--k < 0) { + o += gsm0503_gsm_fr_map[l]; + k = gsm0503_gsm_fr_map[++l]-1; + } + i++; + j++; + } + +} + +static void tch_fr_d_to_b(ubit_t *b_bits, ubit_t *d_bits) +{ + int i; + + for (i = 0; i < 260; i++) + b_bits[gsm0503_d_to_b_index[i]] = d_bits[i]; +} + +static void tch_fr_b_to_d(ubit_t *d_bits, ubit_t *b_bits) +{ + int i; + + for (i = 0; i < 260; i++) + d_bits[i] = b_bits[gsm0503_d_to_b_index[i]]; +} + +static void tch_fr_unreorder(ubit_t *d, ubit_t *p, ubit_t *u) +{ + int i; + + for (i=0; i<91; i++) { + d[i<<1] = u[i]; + d[(i<<1)+1] = u[184-i]; + } + for (i=0; i<3; i++) + p[i] = u[91+i]; +} + +static void tch_fr_reorder(ubit_t *u, ubit_t *d, ubit_t *p) +{ + int i; + + for (i=0; i<91; i++) { + u[i] = d[i<<1]; + u[184-i] = d[(i<<1)+1]; + } + for (i=0; i<3; i++) + u[91+i] = p[i]; +} + +int tch_fr_decode(uint8_t *tch_data, sbit_t *bursts, int net_order) +{ + sbit_t iB[912], cB[456], h; + ubit_t conv[185], b[260], d[260], p[3]; + int i, rv, len, steal = 0; + + for (i=0; i<8; i++) { + gsm0503_tch_fr_burst_unmap(&iB[i * 114], &bursts[i * 116], &h, + i>>2); + steal -= h; + } + + gsm0503_tch_fr_deinterleave(cB, iB); + + if (steal <= 0) { + osmo_conv_decode(&gsm0503_conv_tch_fr, cB, conv); + + tch_fr_unreorder(d, p, conv); + + for (i=0; i<78; i++) + d[i+182] = (cB[i+378] < 0) ? 1:0; + + rv = osmo_crc8gen_check_bits(&gsm0503_tch_fr_crc3, d, 50, p); + if (rv) + return -1; + + if (net_order) { + tch_fr_d_to_b(b, d); + + tch_fr_reassemble(tch_data, b); + } else + tch_fr_d_to_b(tch_data, d); + + len = 33; + } else { + rv = _xcch_decode_cB(tch_data, cB); + if (rv) + return -1; + + len = 23; + } + + return len; +} + +int tch_fr_encode(ubit_t *bursts, uint8_t *tch_data, int len, int net_order) +{ + ubit_t iB[912], cB[456], h; + ubit_t conv[185], b[260], d[260], p[3]; + int i; + + switch (len) { + case 33: /* TCH FR */ + if (net_order) { + tch_fr_disassemble(b, tch_data); + + tch_fr_b_to_d(d, b); + } else + tch_fr_b_to_d(d, tch_data); + + osmo_crc8gen_set_bits(&gsm0503_tch_fr_crc3, d, 50, p); + + tch_fr_reorder(conv, d, p); + + memcpy(cB+378, d+182, 78); + + osmo_conv_encode(&gsm0503_conv_tch_fr, conv, cB); + + h = 0; + + break; + case 23: /* FACCH */ + _xcch_encode_cB(cB, tch_data); + + h = 1; + + break; + default: + return -1; + } + + gsm0503_tch_fr_interleave(cB, iB); + + for (i=0; i<8; i++) + gsm0503_tch_fr_burst_map(&iB[i * 114], &bursts[i * 116], &h, + i>>2); + + return 0; +} + + +/* + * GSM RACH transcoding + */ + +/* + * GSM RACH apply BSIC to parity + * + * p(j) = p(j) xor b(j) j = 0, ..., 5 + * b(0) = MSB of PLMN colour code + * b(5) = LSB of BS colour code + */ + +static int rach_apply_bsic(ubit_t *d, uint8_t bsic) +{ + int i; + + /* Apply it */ + for (i=0; i<6; i++) + d[8+i] ^= ((bsic >> (5-i)) & 1); + + return 0; +} + +int rach_decode(uint8_t *ra, sbit_t *burst, uint8_t bsic) +{ + ubit_t conv[14]; + int rv; + + osmo_conv_decode(&gsm0503_conv_rach, burst, conv); + + rach_apply_bsic(conv, bsic); + + rv = osmo_crc8gen_check_bits(&gsm0503_rach_crc6, conv, 8, conv+8); + if (rv) + return -1; + + osmo_ubit2pbit_ext(ra, 0, conv, 0, 8, 1); + + return 0; +} + +int rach_encode(ubit_t *burst, uint8_t *ra, uint8_t bsic) +{ + ubit_t conv[14]; + + osmo_pbit2ubit_ext(conv, 0, ra, 0, 8, 1); + + osmo_crc8gen_set_bits(&gsm0503_rach_crc6, conv, 8, conv+8); + + rach_apply_bsic(conv, bsic); + + osmo_conv_encode(&gsm0503_conv_rach, conv, burst); + + return 0; +} + + +/* + * GSM SCH transcoding + */ + +int sch_decode(uint8_t *sb_info, sbit_t *burst) +{ + ubit_t conv[35]; + int rv; + + osmo_conv_decode(&gsm0503_conv_sch, burst, conv); + + rv = osmo_crc16gen_check_bits(&gsm0503_sch_crc10, conv, 25, conv+25); + if (rv) + return -1; + + osmo_ubit2pbit_ext(sb_info, 0, conv, 0, 25, 1); + + return 0; +} + +int sch_encode(ubit_t *burst, uint8_t *sb_info) +{ + ubit_t conv[35]; + + osmo_pbit2ubit_ext(conv, 0, sb_info, 0, 25, 1); + + osmo_crc16gen_set_bits(&gsm0503_sch_crc10, conv, 25, conv+25); + + osmo_conv_encode(&gsm0503_conv_sch, conv, burst); + + return 0; +} + diff --git a/src/osmo-bts-trx/gsm0503_coding.h b/src/osmo-bts-trx/gsm0503_coding.h new file mode 100644 index 00000000..240b2c07 --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_coding.h @@ -0,0 +1,15 @@ +#ifndef _0503_CODING_H +#define _0503_CODING_H + +int xcch_decode(uint8_t *l2_data, sbit_t *bursts); +int xcch_encode(ubit_t *bursts, uint8_t *l2_data); +int pdtch_decode(uint8_t *l2_data, sbit_t *bursts, uint8_t *usf_p); +int pdtch_encode(ubit_t *bursts, uint8_t *l2_data, uint8_t l2_len); +int tch_fr_decode(uint8_t *tch_data, sbit_t *bursts, int net_order); +int tch_fr_encode(ubit_t *bursts, uint8_t *tch_data, int len, int net_order); +int rach_decode(uint8_t *ra, sbit_t *burst, uint8_t bsic); +int rach_encode(ubit_t *burst, uint8_t *ra, uint8_t bsic); +int sch_decode(uint8_t *sb_info, sbit_t *burst); +int sch_encode(ubit_t *burst, uint8_t *sb_info); + +#endif /* _0503_CODING_H */ diff --git a/src/osmo-bts-trx/gsm0503_conv.c b/src/osmo-bts-trx/gsm0503_conv.c new file mode 100644 index 00000000..79667715 --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_conv.c @@ -0,0 +1,83 @@ + +#include <stdint.h> + +#include <osmocom/core/conv.h> + +#include "gsm0503_conv.h" + +/* + * GSM convolutional coding + * + * G_0 = 1 + x^3 + x^4 + * G_1 = 1 + x + x^3 + x^4 + */ + +static const uint8_t conv_xcch_next_output[][2] = { + { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, + { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, + { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, + { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, +}; + +static const uint8_t conv_xcch_next_state[][2] = { + { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, + { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, + { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, + { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, +}; + + +const struct osmo_conv_code gsm0503_conv_xcch = { + .N = 2, + .K = 5, + .len = 224, + .next_output = conv_xcch_next_output, + .next_state = conv_xcch_next_state, +}; + + +const struct osmo_conv_code gsm0503_conv_cs2 = { + .N = 2, + .K = 5, + .len = 290, + .next_output = conv_xcch_next_output, + .next_state = conv_xcch_next_state, +}; + + +const struct osmo_conv_code gsm0503_conv_cs3 = { + .N = 2, + .K = 5, + .len = 334, + .next_output = conv_xcch_next_output, + .next_state = conv_xcch_next_state, +}; + + +const struct osmo_conv_code gsm0503_conv_rach = { + .N = 2, + .K = 5, + .len = 14, + .next_output = conv_xcch_next_output, + .next_state = conv_xcch_next_state, +}; + + +const struct osmo_conv_code gsm0503_conv_sch = { + .N = 2, + .K = 5, + .len = 35, + .next_output = conv_xcch_next_output, + .next_state = conv_xcch_next_state, +}; + + +const struct osmo_conv_code gsm0503_conv_tch_fr = { + .N = 2, + .K = 5, + .len = 185, + .next_output = conv_xcch_next_output, + .next_state = conv_xcch_next_state, +}; + + diff --git a/src/osmo-bts-trx/gsm0503_conv.h b/src/osmo-bts-trx/gsm0503_conv.h new file mode 100644 index 00000000..a73d24ba --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_conv.h @@ -0,0 +1,11 @@ +#ifndef _0503_CONV_H +#define _0503_CONV_H + +extern const struct osmo_conv_code gsm0503_conv_xcch; +extern const struct osmo_conv_code gsm0503_conv_cs2; +extern const struct osmo_conv_code gsm0503_conv_cs3; +extern const struct osmo_conv_code gsm0503_conv_rach; +extern const struct osmo_conv_code gsm0503_conv_sch; +extern const struct osmo_conv_code gsm0503_conv_tch_fr; + +#endif /* _0503_CONV_H */ diff --git a/src/osmo-bts-trx/gsm0503_interleaving.c b/src/osmo-bts-trx/gsm0503_interleaving.c new file mode 100644 index 00000000..f8a63625 --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_interleaving.c @@ -0,0 +1,97 @@ + +#include <stdint.h> + +#include <osmocom/core/bits.h> + +#include "gsm0503_interleaving.h" + +/* + * GSM xCCH interleaving and burst mapping + * + * Interleaving: + * + * Given 456 coded input bits, form 4 blocks of 114 bits: + * + * i(B, j) = c(n, k) k = 0, ..., 455 + * n = 0, ..., N, N + 1, ... + * B = B_0 + 4n + (k mod 4) + * j = 2(49k mod 57) + ((k mod 8) div 4) + * + * Mapping on Burst: + * + * e(B, j) = i(B, j) + * e(B, 59 + j) = i(B, 57 + j) j = 0, ..., 56 + * e(B, 57) = h_l(B) + * e(B, 58) = h_n(B) + * + * Where hl(B) and hn(B) are bits in burst B indicating flags. + */ + +void gsm0503_xcch_deinterleave(sbit_t *cB, sbit_t *iB) +{ + int j, k, B; + + for (k=0; k<456; k++) { + B = k & 3; + j = 2 * ((49 * k) % 57) + ((k & 7) >> 2); + cB[k] = iB[B * 114 + j]; + } +} + +void gsm0503_xcch_interleave(ubit_t *cB, ubit_t *iB) +{ + int j, k, B; + + for (k=0; k<456; k++) { + B = k & 3; + j = 2 * ((49 * k) % 57) + ((k & 7) >> 2); + iB[B * 114 + j] = cB[k]; + } +} + +/* + * GSM TCH FR/EFR interleaving and burst mapping + * + * Interleaving: + * + * Given 456 coded input bits, form 8 blocks of 114 bits, + * where event bits of the first 4 block and off bits of the last 4 block + * are used: + * + * i(B, j) = c(n, k) k = 0, ..., 455 + * n = 0, ..., N, N + 1, ... + * B = B_0 + 4n + (k mod 8) + * j = 2(49k mod 57) + ((k mod 8) div 4) + * + * Mapping on Burst: + * + * e(B, j) = i(B, j) + * e(B, 59 + j) = i(B, 57 + j) j = 0, ..., 56 + * e(B, 57) = h_l(B) + * e(B, 58) = h_n(B) + * + * Where hl(B) and hn(B) are bits in burst B indicating flags. + */ + +void gsm0503_tch_fr_deinterleave(sbit_t *cB, sbit_t *iB) +{ + int j, k, B; + + for (k=0; k<456; k++) { + B = k & 7; + j = 2 * ((49 * k) % 57) + ((k & 7) >> 2); + cB[k] = iB[B * 114 + j]; + } +} + +void gsm0503_tch_fr_interleave(ubit_t *cB, ubit_t *iB) +{ + int j, k, B; + + for (k=0; k<456; k++) { + B = k & 7; + j = 2 * ((49 * k) % 57) + ((k & 7) >> 2); + iB[B * 114 + j] = cB[k]; + } +} + diff --git a/src/osmo-bts-trx/gsm0503_interleaving.h b/src/osmo-bts-trx/gsm0503_interleaving.h new file mode 100644 index 00000000..d4c2fdbb --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_interleaving.h @@ -0,0 +1,9 @@ +#ifndef _0503_INTERLEAVING_H +#define _0503_INTERLEAVING_H + +void gsm0503_xcch_deinterleave(sbit_t *cB, sbit_t *iB); +void gsm0503_xcch_interleave(ubit_t *cB, ubit_t *iB); +void gsm0503_tch_fr_deinterleave(sbit_t *cB, sbit_t *iB); +void gsm0503_tch_fr_interleave(ubit_t *cB, ubit_t *iB); + +#endif /* _0503_INTERLEAVING_H */ diff --git a/src/osmo-bts-trx/gsm0503_mapping.c b/src/osmo-bts-trx/gsm0503_mapping.c new file mode 100644 index 00000000..e5ee9206 --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_mapping.c @@ -0,0 +1,65 @@ + +#include <stdint.h> +#include <string.h> + +#include <osmocom/core/bits.h> + +#include "gsm0503_mapping.h" + +void gsm0503_xcch_burst_unmap(sbit_t *iB, sbit_t *eB, sbit_t *hl, sbit_t *hn) +{ + memcpy(iB, eB, 57); + memcpy(iB+57, eB+59, 57); + + if (hl) + *hl = eB[57]; + + if (hn) + *hn = eB[58]; +} + +void gsm0503_xcch_burst_map(ubit_t *iB, ubit_t *eB, const ubit_t *hl, + const ubit_t *hn) +{ + memcpy(eB, iB, 57); + memcpy(eB+59, iB+57, 57); + + if (hl) + eB[57] = *hl; + if (hn) + eB[58] = *hn; +} + +void gsm0503_tch_fr_burst_unmap(sbit_t *iB, sbit_t *eB, sbit_t *h, int odd) +{ + int i; + + /* brainfuck: only copy even or odd bits */ + for (i=odd; i<57; i+=2) + iB[i] = eB[i]; + for (i=58-odd; i<114; i+=2) + iB[i] = eB[i+2]; + + if (h && !odd) + *h = eB[58]; + + if (h && odd) + *h = eB[57]; +} + +void gsm0503_tch_fr_burst_map(ubit_t *iB, ubit_t *eB, const ubit_t *h, int odd) +{ + int i; + + /* brainfuck: only copy even or odd bits */ + for (i=odd; i<57; i+=2) + eB[i] = iB[i]; + for (i=58-odd; i<114; i+=2) + eB[i+2] = iB[i]; + + if (h && !odd) + eB[58] = *h; + if (h && odd) + eB[57] = *h; +} + diff --git a/src/osmo-bts-trx/gsm0503_mapping.h b/src/osmo-bts-trx/gsm0503_mapping.h new file mode 100644 index 00000000..6123266e --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_mapping.h @@ -0,0 +1,10 @@ +#ifndef _0503_MAPPING_H +#define _0503_MAPPING_H + +void gsm0503_xcch_burst_unmap(sbit_t *iB, sbit_t *eB, sbit_t *hl, sbit_t *hn); +void gsm0503_xcch_burst_map(ubit_t *iB, ubit_t *eB, const ubit_t *hl, + const ubit_t *hn); +void gsm0503_tch_fr_burst_unmap(sbit_t *iB, sbit_t *eB, sbit_t *h, int odd); +void gsm0503_tch_fr_burst_map(ubit_t *iB, ubit_t *eB, const ubit_t *h, int odd); + +#endif /* _0503_INTERLEAVING_H */ diff --git a/src/osmo-bts-trx/gsm0503_parity.c b/src/osmo-bts-trx/gsm0503_parity.c new file mode 100644 index 00000000..1ecadcc7 --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_parity.c @@ -0,0 +1,77 @@ + +#include <stdint.h> + +#include <osmocom/core/crcgen.h> + +#include "gsm0503_parity.h" + +/* + * GSM (SACCH) parity (FIRE code) + * + * g(x) = (x^23 + 1)(x^17 + x^3 + 1) + * = x^40 + x^26 + x^23 + x^17 + x^3 + a1 + */ + +const struct osmo_crc64gen_code gsm0503_fire_crc40 = { + .bits = 40, + .poly = 0x0004820009ULL, + .init = 0x0000000000ULL, + .remainder = 0xffffffffffULL, +}; + + +/* + * GSM PDTCH CS-2, CS-3, CS-4 parity + * + * g(x) = x^16 + x^12 + x^5 + 1 + */ + +const struct osmo_crc16gen_code gsm0503_cs234_crc16 = { + .bits = 16, + .poly = 0x1021, + .init = 0x0000, + .remainder = 0xffff, +}; + + +/* + * GSM RACH parity + * + * g(x) = x^6 + x^5 + x^3 + x^2 + x^1 + 1 + */ + +const struct osmo_crc8gen_code gsm0503_rach_crc6 = { + .bits = 6, + .poly = 0x2f, + .init = 0x00, + .remainder = 0x3f, +}; + + +/* + * GSM SCH parity + * + * g(x) = x^10 + x^8 + x^6 + x^5 + x^4 + x^2 + 1 + */ + +const struct osmo_crc16gen_code gsm0503_sch_crc10 = { + .bits = 10, + .poly = 0x175, + .init = 0x000, + .remainder = 0x3ff, +}; + + +/* + * GSM TCH FR/EFR parity + * + * g(x) = x^3 + x + 1 + */ + +const struct osmo_crc8gen_code gsm0503_tch_fr_crc3 = { + .bits = 3, + .poly = 0x3, + .init = 0x0, + .remainder = 0x7, +}; + diff --git a/src/osmo-bts-trx/gsm0503_parity.h b/src/osmo-bts-trx/gsm0503_parity.h new file mode 100644 index 00000000..50d14bfc --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_parity.h @@ -0,0 +1,10 @@ +#ifndef _0503_PARITY_H +#define _0503_PARITY_H + +const struct osmo_crc64gen_code gsm0503_fire_crc40; +const struct osmo_crc16gen_code gsm0503_cs234_crc16; +const struct osmo_crc8gen_code gsm0503_rach_crc6; +const struct osmo_crc16gen_code gsm0503_sch_crc10; +const struct osmo_crc8gen_code gsm0503_tch_fr_crc3; + +#endif /* _0503_PARITY_H */ diff --git a/src/osmo-bts-trx/gsm0503_tables.c b/src/osmo-bts-trx/gsm0503_tables.c new file mode 100644 index 00000000..c4a3dff2 --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_tables.c @@ -0,0 +1,139 @@ + +#include <stdint.h> + +#include <osmocom/core/bits.h> + +#include "gsm0503_tables.h" + +const ubit_t gsm0503_pdtch_hl_hn_ubit[4][8] = { + { 1,1, 1,1, 1,1, 1,1 }, + { 1,1, 0,0, 1,0, 0,0 }, + { 0,0, 1,0, 0,0, 0,1 }, + { 0,0, 0,1, 0,1, 1,0 }, +}; + +const sbit_t gsm0503_pdtch_hl_hn_sbit[4][8] = { + { -127,-127, -127,-127, -127,-127, -127,-127 }, + { -127,-127, 127, 127, -127, 127, 127, 127 }, + { 127, 127, -127, 127, 127, 127, 127,-127 }, + { 127, 127, 127,-127, 127,-127, -127, 127 }, +}; + +const ubit_t gsm0503_usf2six[8][6] = { + { 0,0,0, 0,0,0 }, + { 1,0,0, 1,0,1 }, + { 0,1,0, 1,1,0 }, + { 1,1,0, 0,1,1 }, + { 0,0,1, 0,1,1 }, + { 1,0,1, 1,1,0 }, + { 0,1,1, 1,0,1 }, + { 1,1,1, 0,0,0 }, +}; + +const ubit_t gsm0503_usf2twelve_ubit[8][12] = { + { 0,0,0, 0,0,0, 0,0,0, 0,0,0 }, + { 1,1,0, 1,0,0, 0,0,1, 0,1,1 }, + { 0,0,1, 1,0,1, 1,1,0, 1,1,0 }, + { 1,1,1, 0,0,1, 1,1,1, 1,0,1 }, + { 0,0,0, 0,1,1, 0,1,1, 1,0,1 }, + { 1,1,0, 1,1,1, 0,1,0, 1,1,0 }, + { 0,0,1, 1,1,0, 1,0,1, 0,1,1 }, + { 1,1,1, 0,1,0, 1,0,0, 0,0,0 }, +}; + +const sbit_t gsm0503_usf2twelve_sbit[8][12] = { + { 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127 }, + { -127,-127, 127, -127, 127, 127, 127, 127,-127, 127,-127,-127 }, + { 127, 127,-127, -127, 127,-127, -127,-127, 127, -127,-127, 127 }, + { -127,-127,-127, 127, 127,-127, -127,-127,-127, -127, 127,-127 }, + { 127, 127, 127, 127,-127,-127, 127,-127,-127, -127, 127,-127 }, + { -127,-127, 127, -127,-127,-127, 127,-127, 127, -127,-127, 127 }, + { 127, 127,-127, -127,-127, 127, -127, 127,-127, 127,-127,-127 }, + { -127,-127,-127, 127,-127, 127, -127, 127, 127, 127, 127, 127 }, +}; + +const uint8_t gsm0503_puncture_cs2[588] = { + 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, + 0,0,0,1, 0,0,0,1, 0,0,0,1 +}; + +const uint8_t gsm0503_puncture_cs3[676] = { + 0,0,0,0,0,0, 0,0,0,0,0,0, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, + 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,0 +}; + +/* this corresponds to the bit-lengths of the individual codec + * parameters as indicated in Table 1.1 of TS 06.10 */ +const uint8_t gsm0503_gsm_fr_map[76] = { + 6, 6, 5, 5, 4, 4, 3, 3, + 7, 2, 2, 6, 3, 3, 3, 3, + 3, 3, 3, 3, 3, 3, 3, 3, + 3, 7, 2, 2, 6, 3, 3, 3, + 3, 3, 3, 3, 3, 3, 3, 3, + 3, 3, 7, 2, 2, 6, 3, 3, + 3, 3, 3, 3, 3, 3, 3, 3, + 3, 3, 3, 7, 2, 2, 6, 3, + 3, 3, 3, 3, 3, 3, 3, 3, + 3, 3, 3, 3 +}; + + +/* b(0..259) from d(0..259) according to (corrected) Table 2 of T 05.03 */ +const uint16_t gsm0503_d_to_b_index[260] = { + 5, 52,108,164,220, 4, 11, 16, 3, 10, 15, 21, 42, 98,154,210, + 51,107,163,219, 9, 25, 29, 41, 97,153,209, 40, 96,152,208, 39, + 95,151,207, 38, 94,150,206, 50,106,162,218, 2, 20, 32, 37, 93, + 149,205, 24, 28, 44,100,156,212, 36, 92,148,204, 46,102,158,214, + 1, 8, 14, 35, 19, 23, 31, 43, 99,155,211, 49,105,161,217, 55, + 58, 61, 64, 67, 70, 73, 76, 79, 82, 85, 88, 91,111,114,117,120, + 123,126,129,132,135,138,141,144,147,167,170,173,176,179,182,185, + 188,191,194,197,200,203,223,226,229,232,235,238,241,244,247,250, + 253,256,259, 45,101,157,213, 48,104,160,216, 54, 57, 60, 63, 66, + 69, 72, 75, 78, 81, 84, 87, 90,110,113,116,119,122,125,128,131, + 134,137,140,143,146,166,169,172,175,178,181,184,187,190,193,196, + 199,202,222,225,228,231,234,237,240,243,246,249,252,255,258, 0, + 7, 13, 27, 30, 34, 33, 12, 18, 17, 22, 47,103,159,215, 53, 56, + 59, 62, 65, 68, 71, 74, 77, 80, 83, 86, 89,109,112,115,118,121, + 124,127,130,133,136,139,142,145,165,168,171,174,177,180,183,186, + 189,192,195,198,201,221,224,227,230,233,236,239,242,245,248,251, + 254,257, 6, 26, +}; + diff --git a/src/osmo-bts-trx/gsm0503_tables.h b/src/osmo-bts-trx/gsm0503_tables.h new file mode 100644 index 00000000..abeff2d7 --- /dev/null +++ b/src/osmo-bts-trx/gsm0503_tables.h @@ -0,0 +1,14 @@ +#ifndef _0503_TABLES_H +#define _0503_TABLES_H + +extern const ubit_t gsm0503_pdtch_hl_hn_ubit[4][8]; +extern const sbit_t gsm0503_pdtch_hl_hn_sbit[4][8]; +extern const ubit_t gsm0503_usf2six[8][6]; +extern const ubit_t gsm0503_usf2twelve_ubit[8][12]; +extern const sbit_t gsm0503_usf2twelve_sbit[8][12]; +extern const uint8_t gsm0503_puncture_cs2[588]; +extern const uint8_t gsm0503_puncture_cs3[676]; +extern const uint8_t gsm0503_gsm_fr_map[76]; +extern const uint16_t gsm0503_d_to_b_index[260]; + +#endif /* _0503_TABLES_H */ diff --git a/src/osmo-bts-trx/pxxch.c b/src/osmo-bts-trx/pxxch.c deleted file mode 100644 index 07d011a9..00000000 --- a/src/osmo-bts-trx/pxxch.c +++ /dev/null @@ -1,493 +0,0 @@ -/* - * pxxch.c - * - * Copyright (c) 2013 Andreas Eversberg <jolly@eversberg.eu> - */ - -#include <stdio.h> -#include <stdint.h> -#include <stdlib.h> -#include <string.h> - -#include <osmocom/core/bits.h> -#include <osmocom/core/conv.h> -#include <osmocom/core/crcgen.h> - -#include "pxxch.h" - - -/* - * GSM PDTCH parity (FIRE code) - * - * g(x) = (x^23 + 1)(x^17 + x^3 + 1) - * = x^40 + x^26 + x^23 + x^17 + x^3 + 1 - */ - -const struct osmo_crc64gen_code pxxch_crc40 = { - .bits = 40, - .poly = 0x0004820009ULL, - .init = 0x0000000000ULL, - .remainder = 0xffffffffffULL, -}; - - -/* - * GSM PDTCH CS-2, CS-3, CS-4 parity - * - * g(x) = x^16 + x^12 + x^5 + 1 - */ - -const struct osmo_crc16gen_code pdtch_crc16 = { - .bits = 16, - .poly = 0x1021, - .init = 0x0000, - .remainder = 0xffff, -}; - - -/* - * GSM PDTCH convolutional coding - * - * G_0 = 1 + x^3 + x^4 - * G_1 = 1 + x + x^3 + x^4 - */ - -static const uint8_t conv_cs1_next_output[][2] = { - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, -}; - -static const uint8_t conv_cs1_next_state[][2] = { - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, -}; - -static const struct osmo_conv_code conv_cs1 = { - .N = 2, - .K = 5, - .len = 224, - .next_output = conv_cs1_next_output, - .next_state = conv_cs1_next_state, -}; - -static const uint8_t conv_cs2_next_output[][2] = { - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, -}; - -static const uint8_t conv_cs2_next_state[][2] = { - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, -}; - -static const struct osmo_conv_code conv_cs2 = { - .N = 2, - .K = 5, - .len = 290, - .next_output = conv_cs2_next_output, - .next_state = conv_cs2_next_state, -}; - -static const uint8_t conv_cs3_next_output[][2] = { - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, -}; - -static const uint8_t conv_cs3_next_state[][2] = { - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, -}; - -static const struct osmo_conv_code conv_cs3 = { - .N = 2, - .K = 5, - .len = 334, - .next_output = conv_cs3_next_output, - .next_state = conv_cs3_next_state, -}; - - -/* - * GSM PxxCH interleaving and burst mapping - * - * Interleaving: - * - * Given 456 coded input bits, form 4 blocks of 114 bits: - * - * i(B, j) = c(n, k) k = 0, ..., 455 - * n = 0, ..., N, N + 1, ... - * B = B_0 + 4n + (k mod 4) - * j = 2(49k mod 57) + ((k mod 8) div 4) - * - * Mapping on Burst: - * - * e(B, j) = i(B, j) - * e(B, 59 + j) = i(B, 57 + j) j = 0, ..., 56 - * e(B, 57) = h_l(B) - * e(B, 58) = h_n(B) - * - * Where hl(B) and hn(B) are bits in burst B indicating flags. - */ - -static void -pxxch_deinterleave(sbit_t *cB, sbit_t *iB) -{ - int j, k, B; - - for (k=0; k<456; k++) { - B = k & 3; - j = 2 * ((49 * k) % 57) + ((k & 7) >> 2); - cB[k] = iB[B * 114 + j]; - } -} - -static void -pxxch_interleave(ubit_t *cB, ubit_t *iB) -{ - int j, k, B; - - for (k=0; k<456; k++) { - B = k & 3; - j = 2 * ((49 * k) % 57) + ((k & 7) >> 2); - iB[B * 114 + j] = cB[k]; - } -} - -static void -pxxch_burst_unmap(sbit_t *iB, sbit_t *eB, sbit_t *hl, sbit_t *hn) -{ - memcpy(iB, eB, 57); - memcpy(iB+57, eB+59, 57); - - if (hl) - *hl = eB[57]; - - if (hn) - *hn = eB[58]; -} - -static void -pxxch_burst_map(ubit_t *iB, ubit_t *eB, ubit_t *hl, ubit_t *hn) -{ - memcpy(eB, iB, 57); - memcpy(eB+59, iB+57, 57); - - if (hl) - eB[57] = *hl; - if (hn) - eB[58] = *hn; -} - -static ubit_t pdtch_hl_hn_ubit[4][8] = { - { 1,1, 1,1, 1,1, 1,1 }, - { 1,1, 0,0, 1,0, 0,0 }, - { 0,0, 1,0, 0,0, 0,1 }, - { 0,0, 0,1, 0,1, 1,0 }, -}; - -static sbit_t pdtch_hl_hn_sbit[4][8] = { - { -127,-127, -127,-127, -127,-127, -127,-127 }, - { -127,-127, 127, 127, -127, 127, 127, 127 }, - { 127, 127, -127, 127, 127, 127, 127,-127 }, - { 127, 127, 127,-127, 127,-127, -127, 127 }, -}; - -static ubit_t usf2six[8][6] = { - { 0,0,0, 0,0,0 }, - { 1,0,0, 1,0,1 }, - { 0,1,0, 1,1,0 }, - { 1,1,0, 0,1,1 }, - { 0,0,1, 0,1,1 }, - { 1,0,1, 1,1,0 }, - { 0,1,1, 1,0,1 }, - { 1,1,1, 0,0,0 }, -}; - -static ubit_t usf2twelve_ubit[8][12] = { - { 0,0,0, 0,0,0, 0,0,0, 0,0,0 }, - { 1,1,0, 1,0,0, 0,0,1, 0,1,1 }, - { 0,0,1, 1,0,1, 1,1,0, 1,1,0 }, - { 1,1,1, 0,0,1, 1,1,1, 1,0,1 }, - { 0,0,0, 0,1,1, 0,1,1, 1,0,1 }, - { 1,1,0, 1,1,1, 0,1,0, 1,1,0 }, - { 0,0,1, 1,1,0, 1,0,1, 0,1,1 }, - { 1,1,1, 0,1,0, 1,0,0, 0,0,0 }, -}; - -static sbit_t usf2twelve_sbit[8][12] = { - { 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127 }, - { -127,-127, 127, -127, 127, 127, 127, 127,-127, 127,-127,-127 }, - { 127, 127,-127, -127, 127,-127, -127,-127, 127, -127,-127, 127 }, - { -127,-127,-127, 127, 127,-127, -127,-127,-127, -127, 127,-127 }, - { 127, 127, 127, 127,-127,-127, 127,-127,-127, -127, 127,-127 }, - { -127,-127, 127, -127,-127,-127, 127,-127, 127, -127,-127, 127 }, - { 127, 127,-127, -127,-127, 127, -127, 127,-127, 127,-127,-127 }, - { -127,-127,-127, 127,-127, 127, -127, 127, 127, 127, 127, 127 }, -}; - -static uint8_t puncture_cs2[588] = { - 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, - 0,0,0,1, 0,0,0,1, 0,0,0,1 -}; - -static uint8_t puncture_cs3[676] = { - 0,0,0,0,0,0, 0,0,0,0,0,0, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, - 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,0 -}; - -int -pdtch_decode(uint8_t *l2_data, sbit_t *bursts, uint8_t *usf_p) -{ - sbit_t iB[456], cB[676], hl_hn[8]; - ubit_t conv[456]; - int i, j, k, rv, best = 0, cs = 0, usf = 0; /* make GCC happy */ - - for (i=0; i<4; i++) - pxxch_burst_unmap(&iB[i * 114], &bursts[i * 116], hl_hn + i*2, - hl_hn + i*2 + 1); - - for (i=0; i<4; i++) { - for (j=0, k=0; j<8; j++) - k += abs(((int)pdtch_hl_hn_sbit[i][j]) - ((int)hl_hn[j])); - if (i == 0 || k < best) { - best = k; - cs = i+1; - } - } - - pxxch_deinterleave(cB, iB); - - switch (cs) { - case 1: - osmo_conv_decode(&conv_cs1, cB, conv); - - rv = osmo_crc64gen_check_bits(&pxxch_crc40, conv, 184, - conv+184); - if (rv) - return -1; - - osmo_ubit2pbit_ext(l2_data, 0, conv, 0, 184, 1); - - return 23; - case 2: - for (i=587, j=455; i>=0; i--) - if (!puncture_cs2[i]) - cB[i] = cB[j--]; - else - cB[i] = 0; - - osmo_conv_decode(&conv_cs2, cB, conv); - - for (i=0; i<8; i++) { - for (j=0, k=0; j<6; j++) - k += abs(((int)usf2six[i][j]) - ((int)conv[j])); - if (i == 0 || k < best) { - best = k; - usf = i; - } - } - - conv[3] = usf & 1; - conv[4] = (usf >> 1) & 1; - conv[5] = (usf >> 2) & 1; - if (usf_p) - *usf_p = usf; - - rv = osmo_crc16gen_check_bits(&pdtch_crc16, conv+3, 271, - conv+3+271); - if (rv) - return -1; - - osmo_ubit2pbit_ext(l2_data, 0, conv, 3, 271, 1); - - return 34; - case 3: - for (i=675, j=455; i>=0; i--) - if (!puncture_cs3[i]) - cB[i] = cB[j--]; - else - cB[i] = 0; - - osmo_conv_decode(&conv_cs3, cB, conv); - - for (i=0; i<8; i++) { - for (j=0, k=0; j<6; j++) - k += abs(((int)usf2six[i][j]) - ((int)conv[j])); - if (i == 0 || k < best) { - best = k; - usf = i; - } - } - - conv[3] = usf & 1; - conv[4] = (usf >> 1) & 1; - conv[5] = (usf >> 2) & 1; - if (usf_p) - *usf_p = usf; - - rv = osmo_crc16gen_check_bits(&pdtch_crc16, conv+3, 315, - conv+3+315); - if (rv) - return -1; - - osmo_ubit2pbit_ext(l2_data, 0, conv, 3, 315, 1); - - return 40; - case 4: - for (i=12; i<456;i++) - conv[i] = (cB[i] < 0) ? 1:0; - - for (i=0; i<8; i++) { - for (j=0, k=0; j<12; j++) - k += abs(((int)usf2twelve_sbit[i][j]) - - ((int)cB[j])); - if (i == 0 || k < best) { - best = k; - usf = i; - } - } - - conv[9] = usf & 1; - conv[10] = (usf >> 1) & 1; - conv[11] = (usf >> 2) & 1; - if (usf_p) - *usf_p = usf; - - rv = osmo_crc16gen_check_bits(&pdtch_crc16, conv+9, 431, - conv+9+431); - if (rv) - return -1; - - osmo_ubit2pbit_ext(l2_data, 0, conv, 9, 431, 1); - - return 54; - } - - return -1; -} - -int -pdtch_encode(ubit_t *bursts, uint8_t *l2_data, uint8_t l2_len) -{ - ubit_t iB[456], cB[676], *hl_hn; - ubit_t conv[334]; - int i, j, usf; - - switch (l2_len) { - case 23: - osmo_pbit2ubit_ext(conv, 0, l2_data, 0, 184, 1); - - osmo_crc64gen_set_bits(&pxxch_crc40, conv, 184, conv+184); - - osmo_conv_encode(&conv_cs1, conv, cB); - - hl_hn = pdtch_hl_hn_ubit[0]; - - break; - case 34: - osmo_pbit2ubit_ext(conv, 3, l2_data, 0, 271, 1); - usf = l2_data[0] & 0x7; - - osmo_crc16gen_set_bits(&pdtch_crc16, conv+3, 271, conv+3+271); - - memcpy(conv, usf2six[usf], 6); - - osmo_conv_encode(&conv_cs2, conv, cB); - - for (i=0, j=0; i<588; i++) - if (!puncture_cs2[i]) - cB[j++] = cB[i]; - - hl_hn = pdtch_hl_hn_ubit[1]; - - break; - case 40: - osmo_pbit2ubit_ext(conv, 3, l2_data, 0, 315, 1); - usf = l2_data[0] & 0x7; - - osmo_crc16gen_set_bits(&pdtch_crc16, conv+3, 315, conv+3+315); - - memcpy(conv, usf2six[usf], 6); - - osmo_conv_encode(&conv_cs3, conv, cB); - - for (i=0, j=0; i<676; i++) - if (!puncture_cs3[i]) - cB[j++] = cB[i]; - - hl_hn = pdtch_hl_hn_ubit[2]; - - break; - case 54: - osmo_pbit2ubit_ext(cB, 9, l2_data, 0, 431, 1); - usf = l2_data[0] & 0x7; - - osmo_crc16gen_set_bits(&pdtch_crc16, cB+9, 431, cB+9+431); - - memcpy(cB, usf2twelve_ubit[usf], 12); - - hl_hn = pdtch_hl_hn_ubit[3]; - - break; - default: - return -1; - } - - pxxch_interleave(cB, iB); - - for (i=0; i<4; i++) - pxxch_burst_map(&iB[i * 114], &bursts[i * 116], hl_hn + i*2, - hl_hn + i*2 + 1); - - return 0; -} diff --git a/src/osmo-bts-trx/pxxch.h b/src/osmo-bts-trx/pxxch.h deleted file mode 100644 index 990bd36d..00000000 --- a/src/osmo-bts-trx/pxxch.h +++ /dev/null @@ -1,7 +0,0 @@ -#ifndef _PXXCH_H -#define _PXXCH_H - -int pdtch_decode(uint8_t *l2_data, sbit_t *bursts, uint8_t *usf_p); -int pdtch_encode(ubit_t *bursts, uint8_t *l2_data, uint8_t l2_len); - -#endif /* _PXXCH_H */ diff --git a/src/osmo-bts-trx/rach.c b/src/osmo-bts-trx/rach.c deleted file mode 100644 index 670a4d1d..00000000 --- a/src/osmo-bts-trx/rach.c +++ /dev/null @@ -1,118 +0,0 @@ -/* - * conv_rach.c - * - * Convolutional code tables for RACH channels - * - * Copyright (C) 2011 Sylvain Munaut <tnt@246tNt.com> - */ - - -#include <stdio.h> -#include <stdint.h> -#include <string.h> - -#include <osmocom/core/bits.h> -#include <osmocom/core/conv.h> -#include <osmocom/core/crcgen.h> - -#include "rach.h" - - -/* - * GSM RACH parity - * - * g(x) = x^6 + x^5 + x^3 + x^2 + x^1 + 1 - */ - -static const struct osmo_crc8gen_code rach_crc6 = { - .bits = 6, - .poly = 0x2f, - .init = 0x00, - .remainder = 0x3f, -}; - - -/* - * GSM RACH convolutional coding - * - * G_0 = 1 + x^3 + x^4 - * G_1 = 1 + x + x^3 + x^4 - */ - -static const uint8_t conv_rach_next_output[][2] = { - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, -}; - -static const uint8_t conv_rach_next_state[][2] = { - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, -}; - -const struct osmo_conv_code conv_rach = { - .N = 2, - .K = 5, - .len = 14, - .next_output = conv_rach_next_output, - .next_state = conv_rach_next_state, -}; - - -/* - * GSM RACH apply BSIC to parity - * - * p(j) = p(j) xor b(j) j = 0, ..., 5 - * b(0) = MSB of PLMN colour code - * b(5) = LSB of BS colour code - */ - -static int -rach_apply_bsic(ubit_t *d, uint8_t bsic) -{ - int i; - - /* Apply it */ - for (i=0; i<6; i++) - d[8+i] ^= ((bsic >> (5-i)) & 1); - - return 0; -} - -int -rach_decode(uint8_t *ra, sbit_t *burst, uint8_t bsic) -{ - ubit_t conv[14]; - int rv; - - osmo_conv_decode(&conv_rach, burst, conv); - - rach_apply_bsic(conv, bsic); - - rv = osmo_crc8gen_check_bits(&rach_crc6, conv, 8, conv+8); - if (rv) - return -1; - - osmo_ubit2pbit_ext(ra, 0, conv, 0, 8, 1); - - return 0; -} - -int -rach_encode(ubit_t *burst, uint8_t *ra, uint8_t bsic) -{ - ubit_t conv[14]; - - osmo_pbit2ubit_ext(conv, 0, ra, 0, 8, 1); - - osmo_crc8gen_set_bits(&rach_crc6, conv, 8, conv+8); - - rach_apply_bsic(conv, bsic); - - osmo_conv_encode(&conv_rach, conv, burst); - - return 0; -} diff --git a/src/osmo-bts-trx/rach.h b/src/osmo-bts-trx/rach.h deleted file mode 100644 index 15555593..00000000 --- a/src/osmo-bts-trx/rach.h +++ /dev/null @@ -1,7 +0,0 @@ -#ifndef _RACH_H -#define _RACH_H - -int rach_decode(uint8_t *ra, sbit_t *burst, uint8_t bsic); -int rach_encode(ubit_t *burst, uint8_t *ra, uint8_t bsic); - -#endif /* _RACH_H */ diff --git a/src/osmo-bts-trx/sch.c b/src/osmo-bts-trx/sch.c deleted file mode 100644 index e0d6e8db..00000000 --- a/src/osmo-bts-trx/sch.c +++ /dev/null @@ -1,89 +0,0 @@ -/* - */ - - -#include <stdio.h> -#include <stdint.h> -#include <string.h> - -#include <osmocom/core/bits.h> -#include <osmocom/core/conv.h> -#include <osmocom/core/crcgen.h> - -#include "sch.h" - - -/* - * GSM SCH parity - * - * g(x) = x^10 + x^8 + x^6 + x^5 + x^4 + x^2 + 1 - */ - -const struct osmo_crc16gen_code sch_crc10 = { - .bits = 10, - .poly = 0x175, - .init = 0x000, - .remainder = 0x3ff, -}; - - -/* - * GSM SCH convolutional coding - * - * G_0 = 1 + x^3 + x^4 - * G_1 = 1 + x + x^3 + x^4 - */ - -static const uint8_t conv_rach_next_output[][2] = { - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, -}; - -static const uint8_t conv_rach_next_state[][2] = { - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, -}; - -static const struct osmo_conv_code conv_sch = { - .N = 2, - .K = 5, - .len = 35, - .next_output = conv_rach_next_output, - .next_state = conv_rach_next_state, -}; - - -int -sch_decode(uint8_t *sb_info, sbit_t *burst) -{ - ubit_t conv[35]; - int rv; - - osmo_conv_decode(&conv_sch, burst, conv); - - rv = osmo_crc16gen_check_bits(&sch_crc10, conv, 25, conv+25); - if (rv) - return -1; - - osmo_ubit2pbit_ext(sb_info, 0, conv, 0, 25, 1); - - return 0; -} - -int -sch_encode(ubit_t *burst, uint8_t *sb_info) -{ - ubit_t conv[35]; - - osmo_pbit2ubit_ext(conv, 0, sb_info, 0, 25, 1); - - osmo_crc16gen_set_bits(&sch_crc10, conv, 25, conv+25); - - osmo_conv_encode(&conv_sch, conv, burst); - - return 0; -} diff --git a/src/osmo-bts-trx/sch.h b/src/osmo-bts-trx/sch.h deleted file mode 100644 index 8e60191b..00000000 --- a/src/osmo-bts-trx/sch.h +++ /dev/null @@ -1,7 +0,0 @@ -#ifndef _SCH_H -#define _SCH_H - -int sch_decode(uint8_t *sb_info, sbit_t *burst); -int sch_encode(ubit_t *burst, uint8_t *sb_info); - -#endif /* _SCH_H */ diff --git a/src/osmo-bts-trx/scheduler.c b/src/osmo-bts-trx/scheduler.c index afe4aba3..6f5dddb0 100644 --- a/src/osmo-bts-trx/scheduler.c +++ b/src/osmo-bts-trx/scheduler.c @@ -35,11 +35,7 @@ #include "l1_if.h" #include "scheduler.h" -#include "xcch.h" -#include "tch_fr.h" -#include "rach.h" -#include "sch.h" -#include "pxxch.h" +#include "gsm0503_coding.h" #include "trx_if.h" /* Enable this to multiply TOA of RACH by 10. diff --git a/src/osmo-bts-trx/tch_fr.c b/src/osmo-bts-trx/tch_fr.c deleted file mode 100644 index 23130e94..00000000 --- a/src/osmo-bts-trx/tch_fr.c +++ /dev/null @@ -1,365 +0,0 @@ -/* - * tch_fr.c - * - * Copyright (c) 2013 Andreas Eversberg <jolly@eversberg.eu> - */ - -#include <stdio.h> -#include <stdint.h> -#include <string.h> - -#include <osmocom/core/bits.h> -#include <osmocom/core/conv.h> -#include <osmocom/core/crcgen.h> - -#include "xcch.h" -#include "tch_fr.h" - - -/* - * GSM TCH FR/EFR parity - * - * g(x) = x^3 + x + 1 - */ - -const struct osmo_crc8gen_code tch_fr_crc3 = { - .bits = 3, - .poly = 0x3, - .init = 0x0, - .remainder = 0x7, -}; - - -/* - * GSM TCH FR/EFR convolutional coding - * - * G_0 = 1 + x^3 + x^4 - * G_1 = 1 + x + x^3 + x^4 - */ - -static const uint8_t conv_tch_fr_next_output[][2] = { - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, -}; - -static const uint8_t conv_tch_fr_next_state[][2] = { - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, -}; - -static const struct osmo_conv_code conv_tch_fr = { - .N = 2, - .K = 5, - .len = 185, - .next_output = conv_tch_fr_next_output, - .next_state = conv_tch_fr_next_state, -}; - - -/* - * GSM TCH FR/EFR interleaving and burst mapping - * - * Interleaving: - * - * Given 456 coded input bits, form 8 blocks of 114 bits, - * where event bits of the first 4 block and off bits of the last 4 block - * are used: - * - * i(B, j) = c(n, k) k = 0, ..., 455 - * n = 0, ..., N, N + 1, ... - * B = B_0 + 4n + (k mod 8) - * j = 2(49k mod 57) + ((k mod 8) div 4) - * - * Mapping on Burst: - * - * e(B, j) = i(B, j) - * e(B, 59 + j) = i(B, 57 + j) j = 0, ..., 56 - * e(B, 57) = h_l(B) - * e(B, 58) = h_n(B) - * - * Where hl(B) and hn(B) are bits in burst B indicating flags. - */ - -static void -tch_fr_deinterleave(sbit_t *cB, sbit_t *iB) -{ - int j, k, B; - - for (k=0; k<456; k++) { - B = k & 7; - j = 2 * ((49 * k) % 57) + ((k & 7) >> 2); - cB[k] = iB[B * 114 + j]; - } -} - -static void -tch_fr_interleave(ubit_t *cB, ubit_t *iB) -{ - int j, k, B; - - for (k=0; k<456; k++) { - B = k & 7; - j = 2 * ((49 * k) % 57) + ((k & 7) >> 2); - iB[B * 114 + j] = cB[k]; - } -} - -static void -tch_fr_burst_unmap(sbit_t *iB, sbit_t *eB, sbit_t *h, int odd) -{ - int i; - - /* brainfuck: only copy even or odd bits */ - for (i=odd; i<57; i+=2) - iB[i] = eB[i]; - for (i=58-odd; i<114; i+=2) - iB[i] = eB[i+2]; - - if (h && !odd) - *h = eB[58]; - - if (h && odd) - *h = eB[57]; -} - -static void -tch_fr_burst_map(ubit_t *iB, ubit_t *eB, ubit_t *h, int odd) -{ - int i; - - /* brainfuck: only copy even or odd bits */ - for (i=odd; i<57; i+=2) - eB[i] = iB[i]; - for (i=58-odd; i<114; i+=2) - eB[i+2] = iB[i]; - - if (h && !odd) - eB[58] = *h; - if (h && odd) - eB[57] = *h; -} - -/* this corresponds to the bit-lengths of the individual codec - * parameters as indicated in Table 1.1 of TS 06.10 */ -static const uint8_t gsm_fr_map[] = { - 6, 6, 5, 5, 4, 4, 3, 3, - 7, 2, 2, 6, 3, 3, 3, 3, - 3, 3, 3, 3, 3, 3, 3, 3, - 3, 7, 2, 2, 6, 3, 3, 3, - 3, 3, 3, 3, 3, 3, 3, 3, - 3, 3, 7, 2, 2, 6, 3, 3, - 3, 3, 3, 3, 3, 3, 3, 3, - 3, 3, 3, 7, 2, 2, 6, 3, - 3, 3, 3, 3, 3, 3, 3, 3, - 3, 3, 3, 3 -}; - -static void -tch_fr_reassemble(uint8_t *tch_data, ubit_t *b_bits) -{ - int i, j, k, l, o; - - tch_data[0] = 0xd << 4; - memset(tch_data + 1, 0, 32); - /* reassemble d-bits */ - i = 0; /* counts bits */ - j = 4; /* counts output bits */ - k = gsm_fr_map[0]-1; /* current number bit in element */ - l = 0; /* counts element bits */ - o = 0; /* offset input bits */ - while (i < 260) { - tch_data[j>>3] |= (b_bits[k+o] << (7-(j&7))); - if (--k < 0) { - o += gsm_fr_map[l]; - k = gsm_fr_map[++l]-1; - } - i++; - j++; - } - - /* rearrange according to Table 2 of TS 05.03 */ -} - -static void -tch_fr_disassemble(ubit_t *b_bits, uint8_t *tch_data) -{ - int i, j, k, l, o; - - i = 0; /* counts bits */ - j = 4; /* counts input bits */ - k = gsm_fr_map[0]-1; /* current number bit in element */ - l = 0; /* counts element bits */ - o = 0; /* offset output bits */ - while (i < 260) { - b_bits[k+o] = (tch_data[j>>3] >> (7-(j&7))) & 1; - if (--k < 0) { - o += gsm_fr_map[l]; - k = gsm_fr_map[++l]-1; - } - i++; - j++; - } - -} - - -/* b(0..259) from d(0..259) according to (corrected) Table 2 of T 05.03 */ -static uint16_t d_to_b_index[260] = { - 5, 52,108,164,220, 4, 11, 16, 3, 10, 15, 21, 42, 98,154,210, - 51,107,163,219, 9, 25, 29, 41, 97,153,209, 40, 96,152,208, 39, - 95,151,207, 38, 94,150,206, 50,106,162,218, 2, 20, 32, 37, 93, - 149,205, 24, 28, 44,100,156,212, 36, 92,148,204, 46,102,158,214, - 1, 8, 14, 35, 19, 23, 31, 43, 99,155,211, 49,105,161,217, 55, - 58, 61, 64, 67, 70, 73, 76, 79, 82, 85, 88, 91,111,114,117,120, - 123,126,129,132,135,138,141,144,147,167,170,173,176,179,182,185, - 188,191,194,197,200,203,223,226,229,232,235,238,241,244,247,250, - 253,256,259, 45,101,157,213, 48,104,160,216, 54, 57, 60, 63, 66, - 69, 72, 75, 78, 81, 84, 87, 90,110,113,116,119,122,125,128,131, - 134,137,140,143,146,166,169,172,175,178,181,184,187,190,193,196, - 199,202,222,225,228,231,234,237,240,243,246,249,252,255,258, 0, - 7, 13, 27, 30, 34, 33, 12, 18, 17, 22, 47,103,159,215, 53, 56, - 59, 62, 65, 68, 71, 74, 77, 80, 83, 86, 89,109,112,115,118,121, - 124,127,130,133,136,139,142,145,165,168,171,174,177,180,183,186, - 189,192,195,198,201,221,224,227,230,233,236,239,242,245,248,251, - 254,257, 6, 26, -}; - - -static void -tch_fr_d_to_b(ubit_t *b_bits, ubit_t *d_bits) -{ - int i; - - for (i = 0; i < 260; i++) - b_bits[d_to_b_index[i]] = d_bits[i]; -} - -static void -tch_fr_b_to_d(ubit_t *d_bits, ubit_t *b_bits) -{ - int i; - - for (i = 0; i < 260; i++) - d_bits[i] = b_bits[d_to_b_index[i]]; -} - -static void -tch_fr_unreorder(ubit_t *d, ubit_t *p, ubit_t *u) -{ - int i; - - for (i=0; i<91; i++) { - d[i<<1] = u[i]; - d[(i<<1)+1] = u[184-i]; - } - for (i=0; i<3; i++) - p[i] = u[91+i]; -} - -static void -tch_fr_reorder(ubit_t *u, ubit_t *d, ubit_t *p) -{ - int i; - - for (i=0; i<91; i++) { - u[i] = d[i<<1]; - u[184-i] = d[(i<<1)+1]; - } - for (i=0; i<3; i++) - u[91+i] = p[i]; -} - -int -tch_fr_decode(uint8_t *tch_data, sbit_t *bursts, int network_order) -{ - sbit_t iB[912], cB[456], h; - ubit_t conv[185], b[260], d[260], p[3]; - int i, rv, len, steal = 0; - - for (i=0; i<8; i++) { - tch_fr_burst_unmap(&iB[i * 114], &bursts[i * 116], &h, i>>2); - if (h < 0) - steal++; - } - - tch_fr_deinterleave(cB, iB); - - if (steal < 4) { - osmo_conv_decode(&conv_tch_fr, cB, conv); - - tch_fr_unreorder(d, p, conv); - - for (i=0; i<78; i++) - d[i+182] = (cB[i+378] < 0) ? 1:0; - - rv = osmo_crc8gen_check_bits(&tch_fr_crc3, d, 50, p); - if (rv) - return -1; - - if (network_order) { - tch_fr_d_to_b(b, d); - - tch_fr_reassemble(tch_data, b); - } else - tch_fr_d_to_b(tch_data, d); - - len = 33; - } else { - rv = xcch_decode_cB(tch_data, cB); - if (rv) - return -1; - - len = 23; - } - - return len; -} - -int -tch_fr_encode(ubit_t *bursts, uint8_t *tch_data, int len, int network_order) -{ - ubit_t iB[912], cB[456], h; - ubit_t conv[185], b[260], d[260], p[3]; - int i; - - switch (len) { - case 33: /* TCH FR */ - if (network_order) { - tch_fr_disassemble(b, tch_data); - - tch_fr_b_to_d(d, b); - } else - tch_fr_b_to_d(d, tch_data); - - osmo_crc8gen_set_bits(&tch_fr_crc3, d, 50, p); - - tch_fr_reorder(conv, d, p); - - memcpy(cB+378, d+182, 78); - - osmo_conv_encode(&conv_tch_fr, conv, cB); - - h = 0; - - break; - case 23: /* FACCH */ - xcch_encode_cB(cB, tch_data); - - h = 1; - - break; - default: - return -1; - } - - tch_fr_interleave(cB, iB); - - for (i=0; i<8; i++) - tch_fr_burst_map(&iB[i * 114], &bursts[i * 116], &h, i>>2); - - return 0; -} diff --git a/src/osmo-bts-trx/tch_fr.h b/src/osmo-bts-trx/tch_fr.h deleted file mode 100644 index 01414572..00000000 --- a/src/osmo-bts-trx/tch_fr.h +++ /dev/null @@ -1,8 +0,0 @@ -#ifndef _TCH_FR_H -#define _TCH_FR_H - -int tch_fr_decode(uint8_t *tch_data, sbit_t *bursts, int network_order); -int tch_fr_encode(ubit_t *bursts, uint8_t *tch_data, int len, - int network_order); - -#endif /* _TCH_FR_H */ diff --git a/src/osmo-bts-trx/xcch.c b/src/osmo-bts-trx/xcch.c deleted file mode 100644 index 024bf071..00000000 --- a/src/osmo-bts-trx/xcch.c +++ /dev/null @@ -1,193 +0,0 @@ -/* - * xcch.c - * - * Copyright (c) 2011 Sylvain Munaut <tnt@246tNt.com> - */ - -#include <stdio.h> -#include <stdint.h> -#include <string.h> - -#include <osmocom/core/bits.h> -#include <osmocom/core/conv.h> -#include <osmocom/core/crcgen.h> - -#include "xcch.h" - - -/* - * GSM xCCH parity (FIRE code) - * - * g(x) = (x^23 + 1)(x^17 + x^3 + 1) - * = x^40 + x^26 + x^23 + x^17 + x^3 + 1 - */ - -const struct osmo_crc64gen_code xcch_crc40 = { - .bits = 40, - .poly = 0x0004820009ULL, - .init = 0x0000000000ULL, - .remainder = 0xffffffffffULL, -}; - - -/* - * GSM xCCH convolutional coding - * - * G_0 = 1 + x^3 + x^4 - * G_1 = 1 + x + x^3 + x^4 - */ - -static const uint8_t conv_xcch_next_output[][2] = { - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 }, - { 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 }, -}; - -static const uint8_t conv_xcch_next_state[][2] = { - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, - { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 }, - { 8, 9 }, { 10, 11 }, { 12, 13 }, { 14, 15 }, -}; - -static const struct osmo_conv_code conv_xcch = { - .N = 2, - .K = 5, - .len = 224, - .next_output = conv_xcch_next_output, - .next_state = conv_xcch_next_state, -}; - - -/* - * GSM xCCH interleaving and burst mapping - * - * Interleaving: - * - * Given 456 coded input bits, form 4 blocks of 114 bits: - * - * i(B, j) = c(n, k) k = 0, ..., 455 - * n = 0, ..., N, N + 1, ... - * B = B_0 + 4n + (k mod 4) - * j = 2(49k mod 57) + ((k mod 8) div 4) - * - * Mapping on Burst: - * - * e(B, j) = i(B, j) - * e(B, 59 + j) = i(B, 57 + j) j = 0, ..., 56 - * e(B, 57) = h_l(B) - * e(B, 58) = h_n(B) - * - * Where hl(B) and hn(B) are bits in burst B indicating flags. - */ - -static void -xcch_deinterleave(sbit_t *cB, sbit_t *iB) -{ - int j, k, B; - - for (k=0; k<456; k++) { - B = k & 3; - j = 2 * ((49 * k) % 57) + ((k & 7) >> 2); - cB[k] = iB[B * 114 + j]; - } -} - -static void -xcch_interleave(ubit_t *cB, ubit_t *iB) -{ - int j, k, B; - - for (k=0; k<456; k++) { - B = k & 3; - j = 2 * ((49 * k) % 57) + ((k & 7) >> 2); - iB[B * 114 + j] = cB[k]; - } -} - -static void -xcch_burst_unmap(sbit_t *iB, sbit_t *eB, sbit_t *hl, sbit_t *hn) -{ - memcpy(iB, eB, 57); - memcpy(iB+57, eB+59, 57); - - if (hl) - *hl = eB[57]; - - if (hn) - *hn = eB[58]; -} - -static void -xcch_burst_map(ubit_t *iB, ubit_t *eB, ubit_t *hl, ubit_t *hn) -{ - memcpy(eB, iB, 57); - memcpy(eB+59, iB+57, 57); - - if (hl) - eB[57] = *hl; - if (hn) - eB[58] = *hn; -} - -int -xcch_decode_cB(uint8_t *l2_data, sbit_t *cB) -{ - ubit_t conv[224]; - int rv; - - osmo_conv_decode(&conv_xcch, cB, conv); - - rv = osmo_crc64gen_check_bits(&xcch_crc40, conv, 184, conv+184); - if (rv) - return -1; - - osmo_ubit2pbit_ext(l2_data, 0, conv, 0, 184, 1); - - return 0; -} - -int -xcch_decode(uint8_t *l2_data, sbit_t *bursts) -{ - sbit_t iB[456], cB[456]; - int i; - - for (i=0; i<4; i++) - xcch_burst_unmap(&iB[i * 114], &bursts[i * 116], NULL, NULL); - - xcch_deinterleave(cB, iB); - - return xcch_decode_cB(l2_data, cB); -} - -int -xcch_encode_cB(ubit_t *cB, uint8_t *l2_data) -{ - ubit_t conv[224]; - - osmo_pbit2ubit_ext(conv, 0, l2_data, 0, 184, 1); - - osmo_crc64gen_set_bits(&xcch_crc40, conv, 184, conv+184); - - osmo_conv_encode(&conv_xcch, conv, cB); - - return 0; -} - -int -xcch_encode(ubit_t *bursts, uint8_t *l2_data) -{ - ubit_t iB[456], cB[456], hl = 1, hn = 1; - int i; - - xcch_encode_cB(cB, l2_data); - - xcch_interleave(cB, iB); - - for (i=0; i<4; i++) - xcch_burst_map(&iB[i * 114], &bursts[i * 116], &hl, &hn); - - return 0; -} diff --git a/src/osmo-bts-trx/xcch.h b/src/osmo-bts-trx/xcch.h deleted file mode 100644 index 8e7d3929..00000000 --- a/src/osmo-bts-trx/xcch.h +++ /dev/null @@ -1,10 +0,0 @@ -#ifndef _XCCH_H -#define _XCCH_H - -int xcch_decode_cB(uint8_t *l2_data, sbit_t *cB); -int xcch_decode(uint8_t *l2_data, sbit_t *bursts); -int xcch_encode_cB(ubit_t *cB, uint8_t *l2_data); -int xcch_encode(ubit_t *bursts, uint8_t *l2_data); - -#endif /* _XCCH_H */ - diff --git a/tests/bursts/Makefile.am b/tests/bursts/Makefile.am index 09275188..c3c04067 100644 --- a/tests/bursts/Makefile.am +++ b/tests/bursts/Makefile.am @@ -5,9 +5,10 @@ noinst_PROGRAMS = bursts_test EXTRA_DIST = bursts_test.ok bursts_test_SOURCES = bursts_test.c \ - $(top_builddir)/src/osmo-bts-trx/xcch.c \ - $(top_builddir)/src/osmo-bts-trx/rach.c \ - $(top_builddir)/src/osmo-bts-trx/sch.c \ - $(top_builddir)/src/osmo-bts-trx/tch_fr.c \ - $(top_builddir)/src/osmo-bts-trx/pxxch.c + $(top_builddir)/src/osmo-bts-trx/gsm0503_coding.c \ + $(top_builddir)/src/osmo-bts-trx/gsm0503_conv.c \ + $(top_builddir)/src/osmo-bts-trx/gsm0503_interleaving.c \ + $(top_builddir)/src/osmo-bts-trx/gsm0503_mapping.c \ + $(top_builddir)/src/osmo-bts-trx/gsm0503_tables.c \ + $(top_builddir)/src/osmo-bts-trx/gsm0503_parity.c bursts_test_LDADD = $(LDADD) diff --git a/tests/bursts/bursts_test.c b/tests/bursts/bursts_test.c index ad1f6859..e04899cc 100644 --- a/tests/bursts/bursts_test.c +++ b/tests/bursts/bursts_test.c @@ -26,11 +26,7 @@ #include <osmocom/core/bits.h> #include <osmocom/core/utils.h> -#include "../../src/osmo-bts-trx/xcch.h" -#include "../../src/osmo-bts-trx/rach.h" -#include "../../src/osmo-bts-trx/sch.h" -#include "../../src/osmo-bts-trx/tch_fr.h" -#include "../../src/osmo-bts-trx/pxxch.h" +#include "../../src/osmo-bts-trx/gsm0503_coding.h" #define ASSERT_TRUE(rc) \ |