diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gsm/gsm48_rest_octets.c | 949 | ||||
| -rw-r--r-- | src/gsm/libosmogsm.map | 8 |
2 files changed, 957 insertions, 0 deletions
diff --git a/src/gsm/gsm48_rest_octets.c b/src/gsm/gsm48_rest_octets.c new file mode 100644 index 00000000..619dc6d1 --- /dev/null +++ b/src/gsm/gsm48_rest_octets.c @@ -0,0 +1,949 @@ +/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface, + * rest octet handling according to + * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ + +/* (C) 2009 by Harald Welte <laforge@gnumonks.org> + * + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + */ + +#include <string.h> +#include <stdlib.h> +#include <errno.h> +#include <stdbool.h> + +#include <osmocom/core/bitvec.h> +#include <osmocom/gsm/bitvec_gsm.h> +#include <osmocom/gsm/sysinfo.h> +#include <osmocom/gsm/gsm48_arfcn_range_encode.h> +#include <osmocom/gsm/gsm48_rest_octets.h> + +/* generate SI1 rest octets */ +int osmo_gsm48_rest_octets_si1(uint8_t *data, uint8_t *nch_pos, int is1800_net) +{ + struct bitvec bv; + + memset(&bv, 0, sizeof(bv)); + bv.data = data; + bv.data_len = 1; + + if (nch_pos) { + bitvec_set_bit(&bv, H); + bitvec_set_uint(&bv, *nch_pos, 5); + } else + bitvec_set_bit(&bv, L); + + if (is1800_net) + bitvec_set_bit(&bv, L); + else + bitvec_set_bit(&bv, H); + + bitvec_spare_padding(&bv, 6); + return bv.data_len; +} + +/* Append Repeated E-UTRAN Neighbour Cell to bitvec: see 3GPP TS 44.018 Table 10.5.2.33b.1 */ +static inline bool append_eutran_neib_cell(struct bitvec *bv, const struct osmo_earfcn_si2q *e, size_t *e_offset, + uint8_t budget) +{ + unsigned i, skip = 0; + int16_t rem = budget - 6; /* account for mandatory stop bit and THRESH_E-UTRAN_high */ + uint8_t earfcn_budget; + + if (budget <= 6) + return false; + + OSMO_ASSERT(budget <= SI2Q_MAX_LEN); + + /* first we have to properly adjust budget requirements */ + if (e->prio_valid) /* E-UTRAN_PRIORITY: 3GPP TS 45.008*/ + rem -= 4; + else + rem--; + + if (e->thresh_lo_valid) /* THRESH_E-UTRAN_low: */ + rem -= 6; + else + rem--; + + if (e->qrxlm_valid) /* E-UTRAN_QRXLEVMIN: */ + rem -= 6; + else + rem--; + + if (rem < 0) + return false; + + /* now we can proceed with actually adding EARFCNs within adjusted budget limit */ + for (i = 0; i < e->length; i++) { + if (e->arfcn[i] != OSMO_EARFCN_INVALID) { + if (skip < *e_offset) { + skip++; /* ignore EARFCNs added on previous calls */ + } else { + earfcn_budget = 17; /* compute budget per-EARFCN */ + if (OSMO_EARFCN_MEAS_INVALID == e->meas_bw[i]) + earfcn_budget++; + else + earfcn_budget += 4; + + if (rem - earfcn_budget < 0) + break; + else { + (*e_offset)++; + rem -= earfcn_budget; + + if (rem < 0) + return false; + + bitvec_set_bit(bv, 1); /* EARFCN: */ + bitvec_set_uint(bv, e->arfcn[i], 16); + + if (OSMO_EARFCN_MEAS_INVALID == e->meas_bw[i]) + bitvec_set_bit(bv, 0); + else { /* Measurement Bandwidth: 9.1.54 */ + bitvec_set_bit(bv, 1); + bitvec_set_uint(bv, e->meas_bw[i], 3); + } + } + } + } + } + + /* stop bit - end of EARFCN + Measurement Bandwidth sequence */ + bitvec_set_bit(bv, 0); + + /* Note: we don't support different EARFCN arrays each with different priority, threshold etc. */ + + if (e->prio_valid) { + /* E-UTRAN_PRIORITY: 3GPP TS 45.008*/ + bitvec_set_bit(bv, 1); + bitvec_set_uint(bv, e->prio, 3); + } else + bitvec_set_bit(bv, 0); + + /* THRESH_E-UTRAN_high */ + bitvec_set_uint(bv, e->thresh_hi, 5); + + if (e->thresh_lo_valid) { + /* THRESH_E-UTRAN_low: */ + bitvec_set_bit(bv, 1); + bitvec_set_uint(bv, e->thresh_lo, 5); + } else + bitvec_set_bit(bv, 0); + + if (e->qrxlm_valid) { + /* E-UTRAN_QRXLEVMIN: */ + bitvec_set_bit(bv, 1); + bitvec_set_uint(bv, e->qrxlm, 5); + } else + bitvec_set_bit(bv, 0); + + return true; +} + +static inline void append_earfcn(struct bitvec *bv, const struct osmo_earfcn_si2q *e, size_t *e_offset, uint8_t budget) +{ + bool appended; + unsigned int old = bv->cur_bit; /* save current position to make rollback possible */ + int rem = budget - 25; + if (rem <= 0) + return; + + OSMO_ASSERT(budget <= SI2Q_MAX_LEN); + + /* Additions in Rel-5: */ + bitvec_set_bit(bv, H); + /* No 3G Additional Measurement Param. Descr. */ + bitvec_set_bit(bv, 0); + /* No 3G ADDITIONAL MEASUREMENT Param. Descr. 2 */ + bitvec_set_bit(bv, 0); + /* Additions in Rel-6: */ + bitvec_set_bit(bv, H); + /* 3G_CCN_ACTIVE */ + bitvec_set_bit(bv, 0); + /* Additions in Rel-7: */ + bitvec_set_bit(bv, H); + /* No 700_REPORTING_OFFSET */ + bitvec_set_bit(bv, 0); + /* No 810_REPORTING_OFFSET */ + bitvec_set_bit(bv, 0); + /* Additions in Rel-8: */ + bitvec_set_bit(bv, H); + + /* Priority and E-UTRAN Parameters Description */ + bitvec_set_bit(bv, 1); + + /* No Serving Cell Priority Parameters Descr. */ + bitvec_set_bit(bv, 0); + /* No 3G Priority Parameters Description */ + bitvec_set_bit(bv, 0); + /* E-UTRAN Parameters Description */ + bitvec_set_bit(bv, 1); + + /* E-UTRAN_CCN_ACTIVE */ + bitvec_set_bit(bv, 0); + /* E-UTRAN_Start: 9.1.54 */ + bitvec_set_bit(bv, 1); + /* E-UTRAN_Stop: 9.1.54 */ + bitvec_set_bit(bv, 1); + + /* No E-UTRAN Measurement Parameters Descr. */ + bitvec_set_bit(bv, 0); + /* No GPRS E-UTRAN Measurement Param. Descr. */ + bitvec_set_bit(bv, 0); + + /* Note: each of next 3 "repeated" structures might be repeated any + (0, 1, 2...) times - we only support 1 and 0 */ + + /* Repeated E-UTRAN Neighbour Cells */ + bitvec_set_bit(bv, 1); + + appended = append_eutran_neib_cell(bv, e, e_offset, rem); + if (!appended) { /* appending is impossible within current budget: rollback */ + bv->cur_bit = old; + return; + } + + /* stop bit - end of Repeated E-UTRAN Neighbour Cells sequence: */ + bitvec_set_bit(bv, 0); + + /* Note: following 2 repeated structs are not supported ATM */ + /* stop bit - end of Repeated E-UTRAN Not Allowed Cells sequence: */ + bitvec_set_bit(bv, 0); + /* stop bit - end of Repeated E-UTRAN PCID to TA mapping sequence: */ + bitvec_set_bit(bv, 0); + + /* Priority and E-UTRAN Parameters Description ends here */ + /* No 3G CSG Description */ + bitvec_set_bit(bv, 0); + /* No E-UTRAN CSG Description */ + bitvec_set_bit(bv, 0); + /* No Additions in Rel-9: */ + bitvec_set_bit(bv, L); +} + +static int range_encode(enum osmo_gsm48_range r, int *arfcns, int arfcns_used, int *w, + int f0, uint8_t *chan_list) +{ + /* + * Manipulate the ARFCN list according to the rules in J4 depending + * on the selected range. + */ + int rc, f0_included; + + osmo_gsm48_range_enc_filter_arfcns(arfcns, arfcns_used, f0, &f0_included); + + rc = osmo_gsm48_range_enc_arfcns(r, arfcns, arfcns_used, w, 0); + if (rc < 0) + return rc; + + /* Select the range and the amount of bits needed */ + switch (r) { + case OSMO_GSM48_ARFCN_RANGE_128: + return osmo_gsm48_range_enc_range128(chan_list, f0, w); + case OSMO_GSM48_ARFCN_RANGE_256: + return osmo_gsm48_range_enc_range256(chan_list, f0, w); + case OSMO_GSM48_ARFCN_RANGE_512: + return osmo_gsm48_range_enc_range512(chan_list, f0, w); + case OSMO_GSM48_ARFCN_RANGE_1024: + return osmo_gsm48_range_enc_range1024(chan_list, f0, f0_included, w); + default: + return -ERANGE; + }; + + return f0_included; +} + +static inline int f0_helper(int *sc, size_t length, uint8_t *chan_list) +{ + int w[OSMO_GSM48_RANGE_ENC_MAX_ARFCNS] = { 0 }; + + return range_encode(OSMO_GSM48_ARFCN_RANGE_1024, sc, length, w, 0, chan_list); +} + +/* Return p(n) for given NR_OF_TDD_CELLS - see Table 9.1.54.1a, 3GPP TS 44.018 */ +static unsigned range1024_p(unsigned n) +{ + switch (n) { + case 0: return 0; + case 1: return 10; + case 2: return 19; + case 3: return 28; + case 4: return 36; + case 5: return 44; + case 6: return 52; + case 7: return 60; + case 8: return 67; + case 9: return 74; + case 10: return 81; + case 11: return 88; + case 12: return 95; + case 13: return 102; + case 14: return 109; + case 15: return 116; + case 16: return 122; + default: return 0; + } +} + +/* Estimate how many bits it'll take to append single FDD UARFCN */ +static inline int append_utran_fdd_length(uint16_t u, const int *sc, size_t sc_len, size_t length) +{ + uint8_t chan_list[16] = { 0 }; + int tmp[sc_len], f0; + + memcpy(tmp, sc, sizeof(tmp)); + + f0 = f0_helper(tmp, length, chan_list); + if (f0 < 0) + return f0; + + return 21 + range1024_p(length); +} + +/* Append single FDD UARFCN */ +static inline int append_utran_fdd(struct bitvec *bv, uint16_t u, int *sc, size_t length) +{ + uint8_t chan_list[16] = { 0 }; + int f0 = f0_helper(sc, length, chan_list); + + if (f0 < 0) + return f0; + + /* Repeated UTRAN FDD Neighbour Cells */ + bitvec_set_bit(bv, 1); + + /* FDD-ARFCN */ + bitvec_set_bit(bv, 0); + bitvec_set_uint(bv, u, 14); + + /* FDD_Indic0: parameter value '0000000000' is a member of the set? */ + bitvec_set_bit(bv, f0); + /* NR_OF_FDD_CELLS */ + bitvec_set_uint(bv, length, 5); + + f0 = bv->cur_bit; + bitvec_add_range1024(bv, (struct gsm48_range_1024 *)chan_list); + bv->cur_bit = f0 + range1024_p(length); + + return 21 + range1024_p(length); +} + +static inline int try_adding_uarfcn(struct bitvec *bv, uint16_t *scramble_list, + size_t uarfcn_length, size_t *u_offset, + uint16_t uarfcn, uint8_t num_sc, uint8_t start_pos, uint8_t budget) +{ + int i, k, rc, a[uarfcn_length]; + + if (budget < 23) + return -ENOMEM; + + /* copy corresponding Scrambling Codes: range encoder make in-place modifications */ + for (i = start_pos, k = 0; i < num_sc; a[k++] = scramble_list[i++]); + + /* estimate bit length requirements */ + rc = append_utran_fdd_length(uarfcn, a, uarfcn_length, k); + if (rc < 0) + return rc; /* range encoder failure */ + + if (budget - rc <= 0) + return -ENOMEM; /* we have ran out of budget in current SI2q */ + + /* compute next offset */ + *u_offset += k; + + return budget - append_utran_fdd(bv, uarfcn, a, k); +} + +/* Append multiple FDD UARFCNs */ +static inline void append_uarfcns(struct bitvec *bv, const uint16_t *uarfcn_list, size_t *u_offset, + size_t uarfcn_length, uint16_t *scramble_list, uint8_t budget) +{ + int i, rem = budget - 7, st = *u_offset; /* account for constant bits right away */ + uint16_t cu = uarfcn_list[*u_offset]; /* caller ensures that length is positive */ + + OSMO_ASSERT(budget <= SI2Q_MAX_LEN); + + if (budget <= 7) + return; + + /* 3G Neighbour Cell Description */ + bitvec_set_bit(bv, 1); + /* No Index_Start_3G */ + bitvec_set_bit(bv, 0); + /* No Absolute_Index_Start_EMR */ + bitvec_set_bit(bv, 0); + + /* UTRAN FDD Description */ + bitvec_set_bit(bv, 1); + /* No Bandwidth_FDD */ + bitvec_set_bit(bv, 0); + + for (i = *u_offset; i <= uarfcn_length; i++) + if (uarfcn_list[i] != cu) { /* we've reached new UARFCN */ + rem = try_adding_uarfcn(bv, scramble_list, uarfcn_length, u_offset, cu, i, st, rem); + if (rem < 0) + break; + + if (i < uarfcn_length) { + cu = uarfcn_list[i]; + st = i; + } else + break; + } + + /* stop bit - end of Repeated UTRAN FDD Neighbour Cells */ + bitvec_set_bit(bv, 0); + + /* UTRAN TDD Description */ + bitvec_set_bit(bv, 0); +} + +static size_t si2q_earfcn_count(const struct osmo_earfcn_si2q *e) +{ + unsigned i, ret = 0; + + if (!e) + return 0; + + for (i = 0; i < e->length; i++) + if (e->arfcn[i] != OSMO_EARFCN_INVALID) + ret++; + + return ret; +} + +/* generate SI2quater rest octets: 3GPP TS 44.018 ยง 10.5.2.33b */ +int osmo_gsm48_rest_octets_si2quater(uint8_t *data, uint8_t si2q_index, uint8_t si2q_count, const uint16_t *uarfcn_list, + size_t *u_offset, size_t uarfcn_length, uint16_t *scramble_list, + struct osmo_earfcn_si2q *si2quater_neigh_list, size_t *e_offset) +{ + int rc; + struct bitvec bv; + + if (si2q_count < si2q_index) + return -EINVAL; + + bv.data = data; + bv.data_len = 20; + bitvec_zero(&bv); + + /* BA_IND: Set to '0' as that's what we use for SI2xxx type, + * whereas '1' is used for SI5xxx type messages. The point here + * is to be able to correlate whether a given MS measurement + * report was using the neighbor cells advertised in SI2 or in + * SI5, as those two could very well be different */ + bitvec_set_bit(&bv, 0); + /* 3G_BA_IND */ + bitvec_set_bit(&bv, 1); + /* MP_CHANGE_MARK */ + bitvec_set_bit(&bv, 0); + + /* SI2quater_INDEX */ + bitvec_set_uint(&bv, si2q_index, 4); + /* SI2quater_COUNT */ + bitvec_set_uint(&bv, si2q_count, 4); + + /* No Measurement_Parameters Description */ + bitvec_set_bit(&bv, 0); + /* No GPRS_Real Time Difference Description */ + bitvec_set_bit(&bv, 0); + /* No GPRS_BSIC Description */ + bitvec_set_bit(&bv, 0); + /* No GPRS_REPORT PRIORITY Description */ + bitvec_set_bit(&bv, 0); + /* No GPRS_MEASUREMENT_Parameters Description */ + bitvec_set_bit(&bv, 0); + /* No NC Measurement Parameters */ + bitvec_set_bit(&bv, 0); + /* No extension (length) */ + bitvec_set_bit(&bv, 0); + + rc = SI2Q_MAX_LEN - (bv.cur_bit + 3); + if (rc > 0 && uarfcn_length - *u_offset > 0) + append_uarfcns(&bv, uarfcn_list, u_offset, uarfcn_length, scramble_list, rc); + else /* No 3G Neighbour Cell Description */ + bitvec_set_bit(&bv, 0); + + /* No 3G Measurement Parameters Description */ + bitvec_set_bit(&bv, 0); + /* No GPRS_3G_MEASUREMENT Parameters Descr. */ + bitvec_set_bit(&bv, 0); + + rc = SI2Q_MAX_LEN - bv.cur_bit; + if (rc > 0 && si2q_earfcn_count(si2quater_neigh_list) - *e_offset > 0) + append_earfcn(&bv, si2quater_neigh_list, e_offset, rc); + else /* No Additions in Rel-5: */ + bitvec_set_bit(&bv, L); + + bitvec_spare_padding(&bv, (bv.data_len * 8) - 1); + return bv.data_len; +} + +/* Append selection parameters to bitvec */ +static void append_selection_params(struct bitvec *bv, + const struct osmo_gsm48_si_selection_params *sp) +{ + if (sp->present) { + bitvec_set_bit(bv, H); + bitvec_set_bit(bv, sp->cbq); + bitvec_set_uint(bv, sp->cell_resel_off, 6); + bitvec_set_uint(bv, sp->temp_offs, 3); + bitvec_set_uint(bv, sp->penalty_time, 5); + } else + bitvec_set_bit(bv, L); +} + +/* Append power offset to bitvec */ +static void append_power_offset(struct bitvec *bv, + const struct osmo_gsm48_si_power_offset *po) +{ + if (po->present) { + bitvec_set_bit(bv, H); + bitvec_set_uint(bv, po->power_offset, 2); + } else + bitvec_set_bit(bv, L); +} + +/* Append GPRS indicator to bitvec */ +static void append_gprs_ind(struct bitvec *bv, + const struct osmo_gsm48_si3_gprs_ind *gi) +{ + if (gi->present) { + bitvec_set_bit(bv, H); + bitvec_set_uint(bv, gi->ra_colour, 3); + /* 0 == SI13 in BCCH Norm, 1 == SI13 sent on BCCH Ext */ + bitvec_set_bit(bv, gi->si13_position); + } else + bitvec_set_bit(bv, L); +} + +/* Generate SI2ter Rest Octests 3GPP TS 44.018 Table 10.5.2.33a.1 */ +int osmo_gsm48_rest_octets_si2ter(uint8_t *data) +{ + struct bitvec bv; + + memset(&bv, 0, sizeof(bv)); + bv.data = data; + bv.data_len = 4; + + /* No SI2ter_MP_CHANGE_MARK */ + bitvec_set_bit(&bv, L); + + bitvec_spare_padding(&bv, (bv.data_len * 8) - 1); + + return bv.data_len; +} + +/* Generate SI2bis Rest Octests 3GPP TS 44.018 Table 10.5.2.33.1 */ +int osmo_gsm48_rest_octets_si2bis(uint8_t *data) +{ + struct bitvec bv; + + memset(&bv, 0, sizeof(bv)); + bv.data = data; + bv.data_len = 1; + + bitvec_spare_padding(&bv, (bv.data_len * 8) - 1); + + return bv.data_len; +} + +/* Generate SI3 Rest Octests (Chapter 10.5.2.34 / Table 10.4.72) */ +int osmo_gsm48_rest_octets_si3(uint8_t *data, const struct osmo_gsm48_si_ro_info *si3) +{ + struct bitvec bv; + + memset(&bv, 0, sizeof(bv)); + bv.data = data; + bv.data_len = 4; + + /* Optional Selection Parameters */ + append_selection_params(&bv, &si3->selection_params); + + /* Optional Power Offset */ + append_power_offset(&bv, &si3->power_offset); + + /* Do we have a SI2ter on the BCCH? */ + if (si3->si2ter_indicator) + bitvec_set_bit(&bv, H); + else + bitvec_set_bit(&bv, L); + + /* Early Classmark Sending Control */ + if (si3->early_cm_ctrl) + bitvec_set_bit(&bv, H); + else + bitvec_set_bit(&bv, L); + + /* Do we have a SI Type 9 on the BCCH? */ + if (si3->scheduling.present) { + bitvec_set_bit(&bv, H); + bitvec_set_uint(&bv, si3->scheduling.where, 3); + } else + bitvec_set_bit(&bv, L); + + /* GPRS Indicator */ + append_gprs_ind(&bv, &si3->gprs_ind); + + /* 3G Early Classmark Sending Restriction. If H, then controlled by + * early_cm_ctrl above */ + if (si3->early_cm_restrict_3g) + bitvec_set_bit(&bv, L); + else + bitvec_set_bit(&bv, H); + + if (si3->si2quater_indicator) { + bitvec_set_bit(&bv, H); /* indicator struct present */ + bitvec_set_uint(&bv, 0, 1); /* message is sent on BCCH Norm */ + } + + bitvec_spare_padding(&bv, (bv.data_len*8)-1); + return bv.data_len; +} + +static int append_lsa_params(struct bitvec *bv, + const struct osmo_gsm48_lsa_params *lsa_params) +{ + /* FIXME */ + return -1; +} + +/* Generate SI4 Rest Octets (Chapter 10.5.2.35) */ +int osmo_gsm48_rest_octets_si4(uint8_t *data, const struct osmo_gsm48_si_ro_info *si4, int len) +{ + struct bitvec bv; + + memset(&bv, 0, sizeof(bv)); + bv.data = data; + bv.data_len = len; + + /* SI4 Rest Octets O */ + append_selection_params(&bv, &si4->selection_params); + append_power_offset(&bv, &si4->power_offset); + append_gprs_ind(&bv, &si4->gprs_ind); + + if (0 /* FIXME */) { + /* H and SI4 Rest Octets S */ + bitvec_set_bit(&bv, H); + + /* LSA Parameters */ + if (si4->lsa_params.present) { + bitvec_set_bit(&bv, H); + append_lsa_params(&bv, &si4->lsa_params); + } else + bitvec_set_bit(&bv, L); + + /* Cell Identity */ + if (1) { + bitvec_set_bit(&bv, H); + bitvec_set_uint(&bv, si4->cell_id, 16); + } else + bitvec_set_bit(&bv, L); + + /* LSA ID Information */ + if (0) { + bitvec_set_bit(&bv, H); + /* FIXME */ + } else + bitvec_set_bit(&bv, L); + } else { + /* L and break indicator */ + bitvec_set_bit(&bv, L); + bitvec_set_bit(&bv, si4->break_ind ? H : L); + } + + return bv.data_len; +} + + +/* GSM 04.18 ETSI TS 101 503 V8.27.0 (2006-05) + +<SI6 rest octets> ::= +{L | H <PCH and NCH info>} +{L | H <VBS/VGCS options : bit(2)>} +{ < DTM_support : bit == L > I < DTM_support : bit == H > +< RAC : bit (8) > +< MAX_LAPDm : bit (3) > } +< Band indicator > +{ L | H < GPRS_MS_TXPWR_MAX_CCH : bit (5) > } +<implicit spare >; +*/ +int osmo_gsm48_rest_octets_si6(uint8_t *data, bool is1800_net) +{ + struct bitvec bv; + + memset(&bv, 0, sizeof(bv)); + bv.data = data; + bv.data_len = 1; + + /* no PCH/NCH info */ + bitvec_set_bit(&bv, L); + /* no VBS/VGCS options */ + bitvec_set_bit(&bv, L); + /* no DTM_support */ + bitvec_set_bit(&bv, L); + /* band indicator */ + if (is1800_net) + bitvec_set_bit(&bv, L); + else + bitvec_set_bit(&bv, H); + /* no GPRS_MS_TXPWR_MAX_CCH */ + bitvec_set_bit(&bv, L); + + bitvec_spare_padding(&bv, (bv.data_len * 8) - 1); + return bv.data_len; +} + +/* GPRS Mobile Allocation as per TS 04.60 Chapter 12.10a: + < GPRS Mobile Allocation IE > ::= + < HSN : bit (6) > + { 0 | 1 < RFL number list : < RFL number list struct > > } + { 0 < MA_LENGTH : bit (6) > + < MA_BITMAP: bit (val(MA_LENGTH) + 1) > + | 1 { 0 | 1 <ARFCN index list : < ARFCN index list struct > > } } ; + + < RFL number list struct > :: = + < RFL_NUMBER : bit (4) > + { 0 | 1 < RFL number list struct > } ; + < ARFCN index list struct > ::= + < ARFCN_INDEX : bit(6) > + { 0 | 1 < ARFCN index list struct > } ; + */ +static int append_gprs_mobile_alloc(struct bitvec *bv) +{ + /* Hopping Sequence Number */ + bitvec_set_uint(bv, 0, 6); + + if (0) { + /* We want to use a RFL number list */ + bitvec_set_bit(bv, 1); + /* FIXME: RFL number list */ + } else + bitvec_set_bit(bv, 0); + + if (0) { + /* We want to use a MA_BITMAP */ + bitvec_set_bit(bv, 0); + /* FIXME: MA_LENGTH, MA_BITMAP, ... */ + } else { + bitvec_set_bit(bv, 1); + if (0) { + /* We want to provide an ARFCN index list */ + bitvec_set_bit(bv, 1); + /* FIXME */ + } else + bitvec_set_bit(bv, 0); + } + return 0; +} + +static int encode_t3192(unsigned int t3192) +{ + /* See also 3GPP TS 44.060 + Table 12.24.2: GPRS Cell Options information element details */ + if (t3192 == 0) + return 3; + else if (t3192 <= 80) + return 4; + else if (t3192 <= 120) + return 5; + else if (t3192 <= 160) + return 6; + else if (t3192 <= 200) + return 7; + else if (t3192 <= 500) + return 0; + else if (t3192 <= 1000) + return 1; + else if (t3192 <= 1500) + return 2; + else + return -EINVAL; +} + +static int encode_drx_timer(unsigned int drx) +{ + if (drx == 0) + return 0; + else if (drx == 1) + return 1; + else if (drx == 2) + return 2; + else if (drx <= 4) + return 3; + else if (drx <= 8) + return 4; + else if (drx <= 16) + return 5; + else if (drx <= 32) + return 6; + else if (drx <= 64) + return 7; + else + return -EINVAL; +} + +/* GPRS Cell Options as per TS 04.60 Chapter 12.24 + < GPRS Cell Options IE > ::= + < NMO : bit(2) > + < T3168 : bit(3) > + < T3192 : bit(3) > + < DRX_TIMER_MAX: bit(3) > + < ACCESS_BURST_TYPE: bit > + < CONTROL_ACK_TYPE : bit > + < BS_CV_MAX: bit(4) > + { 0 | 1 < PAN_DEC : bit(3) > + < PAN_INC : bit(3) > + < PAN_MAX : bit(3) > + { 0 | 1 < Extension Length : bit(6) > + < bit (val(Extension Length) + 1 + & { < Extension Information > ! { bit ** = <no string> } } ; + < Extension Information > ::= + { 0 | 1 < EGPRS_PACKET_CHANNEL_REQUEST : bit > + < BEP_PERIOD : bit(4) > } + < PFC_FEATURE_MODE : bit > + < DTM_SUPPORT : bit > + <BSS_PAGING_COORDINATION: bit > + <spare bit > ** ; + */ +static int append_gprs_cell_opt(struct bitvec *bv, + const struct osmo_gprs_cell_options *gco) +{ + int t3192, drx_timer_max; + + t3192 = encode_t3192(gco->t3192); + if (t3192 < 0) + return t3192; + + drx_timer_max = encode_drx_timer(gco->drx_timer_max); + if (drx_timer_max < 0) + return drx_timer_max; + + bitvec_set_uint(bv, gco->nmo, 2); + + /* See also 3GPP TS 44.060 + Table 12.24.2: GPRS Cell Options information element details */ + bitvec_set_uint(bv, gco->t3168 / 500 - 1, 3); + + bitvec_set_uint(bv, t3192, 3); + bitvec_set_uint(bv, drx_timer_max, 3); + /* ACCESS_BURST_TYPE: Hard-code 8bit */ + bitvec_set_bit(bv, 0); + /* CONTROL_ACK_TYPE: */ + bitvec_set_bit(bv, gco->ctrl_ack_type_use_block); + bitvec_set_uint(bv, gco->bs_cv_max, 4); + + if (0) { + /* hard-code no PAN_{DEC,INC,MAX} */ + bitvec_set_bit(bv, 0); + } else { + /* copied from ip.access BSC protocol trace */ + bitvec_set_bit(bv, 1); + bitvec_set_uint(bv, 1, 3); /* DEC */ + bitvec_set_uint(bv, 1, 3); /* INC */ + bitvec_set_uint(bv, 15, 3); /* MAX */ + } + + if (!gco->ext_info_present) { + /* no extension information */ + bitvec_set_bit(bv, 0); + } else { + /* extension information */ + bitvec_set_bit(bv, 1); + if (!gco->ext_info.egprs_supported) { + /* 6bit length of extension */ + bitvec_set_uint(bv, (1 + 3)-1, 6); + /* EGPRS supported in the cell */ + bitvec_set_bit(bv, 0); + } else { + /* 6bit length of extension */ + bitvec_set_uint(bv, (1 + 5 + 3)-1, 6); + /* EGPRS supported in the cell */ + bitvec_set_bit(bv, 1); + + /* 1bit EGPRS PACKET CHANNEL REQUEST */ + if (gco->supports_egprs_11bit_rach == 0) { + bitvec_set_bit(bv, + gco->ext_info.use_egprs_p_ch_req); + } else { + bitvec_set_bit(bv, 0); + } + + /* 4bit BEP PERIOD */ + bitvec_set_uint(bv, gco->ext_info.bep_period, 4); + } + bitvec_set_bit(bv, gco->ext_info.pfc_supported); + bitvec_set_bit(bv, gco->ext_info.dtm_supported); + bitvec_set_bit(bv, gco->ext_info.bss_paging_coordination); + } + + return 0; +} + +static void append_gprs_pwr_ctrl_pars(struct bitvec *bv, + const struct osmo_gprs_power_ctrl_pars *pcp) +{ + bitvec_set_uint(bv, pcp->alpha, 4); + bitvec_set_uint(bv, pcp->t_avg_w, 5); + bitvec_set_uint(bv, pcp->t_avg_t, 5); + bitvec_set_uint(bv, pcp->pc_meas_chan, 1); + bitvec_set_uint(bv, pcp->n_avg_i, 4); +} + +/* Generate SI13 Rest Octests (04.08 Chapter 10.5.2.37b) */ +int osmo_gsm48_rest_octets_si13(uint8_t *data, const struct osmo_gsm48_si13_info *si13) +{ + struct bitvec bv; + + memset(&bv, 0, sizeof(bv)); + bv.data = data; + bv.data_len = 20; + + if (0) { + /* No rest octets */ + bitvec_set_bit(&bv, L); + } else { + bitvec_set_bit(&bv, H); + bitvec_set_uint(&bv, si13->bcch_change_mark, 3); + bitvec_set_uint(&bv, si13->si_change_field, 4); + if (1) { + bitvec_set_bit(&bv, 0); + } else { + bitvec_set_bit(&bv, 1); + bitvec_set_uint(&bv, si13->bcch_change_mark, 2); + append_gprs_mobile_alloc(&bv); + } + /* PBCCH not present in cell: + it shall never be indicated according to 3GPP TS 44.018 Table 10.5.2.37b.1 */ + bitvec_set_bit(&bv, 0); + bitvec_set_uint(&bv, si13->rac, 8); + bitvec_set_bit(&bv, si13->spgc_ccch_sup); + bitvec_set_uint(&bv, si13->prio_acc_thr, 3); + bitvec_set_uint(&bv, si13->net_ctrl_ord, 2); + append_gprs_cell_opt(&bv, &si13->cell_opts); + append_gprs_pwr_ctrl_pars(&bv, &si13->pwr_ctrl_pars); + + /* 3GPP TS 44.018 Release 6 / 10.5.2.37b */ + bitvec_set_bit(&bv, H); /* added Release 99 */ + /* claim our SGSN is compatible with Release 99, as EDGE and EGPRS + * was only added in this Release */ + bitvec_set_bit(&bv, 1); + } + bitvec_spare_padding(&bv, (bv.data_len*8)-1); + return bv.data_len; +} diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map index 922ac01f..a9037870 100644 --- a/src/gsm/libosmogsm.map +++ b/src/gsm/libosmogsm.map @@ -273,6 +273,14 @@ gsm414_msgt_names; gsm48_push_l3hdr; gsm48_att_tlvdef; gsm48_cc_msg_name; +gsm48_rest_octets_si1; +gsm48_rest_octets_si2quater; +gsm48_rest_octets_si2ter; +gsm48_rest_octets_si2bis; +gsm48_rest_octets_si6; +gsm48_rest_octets_si3; +gsm48_rest_octets_si4; +gsm48_rest_octets_si13; gsm48_rr_msg_name; gsm48_cc_state_name; gsm48_construct_ra; |