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-rw-r--r--src/libbsc/rest_octets.c860
1 files changed, 860 insertions, 0 deletions
diff --git a/src/libbsc/rest_octets.c b/src/libbsc/rest_octets.c
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+++ b/src/libbsc/rest_octets.c
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+/* 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 <openbsc/debug.h>
+#include <openbsc/gsm_data.h>
+#include <osmocom/core/bitvec.h>
+#include <osmocom/gsm/bitvec_gsm.h>
+#include <openbsc/rest_octets.h>
+#include <openbsc/arfcn_range_encode.h>
+#include <openbsc/system_information.h>
+
+/* generate SI1 rest octets */
+int 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 void append_eutran_neib_cell(struct bitvec *bv, struct gsm_bts *bts, uint8_t budget)
+{
+ const struct osmo_earfcn_si2q *e = &bts->si_common.si2quater_neigh_list;
+ unsigned i, skip = 0;
+ size_t offset = bts->e_offset;
+ uint8_t rem = budget - 6, earfcn_budget; /* account for mandatory stop bit and THRESH_E-UTRAN_high */
+
+ if (budget <= 6)
+ return;
+
+ 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--;
+
+ /* 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 < 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 {
+ bts->e_offset++;
+ rem -= earfcn_budget;
+ 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);
+}
+
+static inline void append_earfcn(struct bitvec *bv, struct gsm_bts *bts, uint8_t budget)
+{
+ 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);
+
+ /* N. B: 25 bits are set in append_earfcn() - keep it in sync with budget adjustment below: */
+ append_eutran_neib_cell(bv, bts, rem);
+
+ /* 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 inline int f0_helper(int *sc, size_t length, uint8_t *chan_list)
+{
+ int w[RANGE_ENC_MAX_ARFCNS] = { 0 };
+
+ return range_encode(ARFCN_RANGE_1024, sc, length, w, 0, chan_list);
+}
+
+/* Estimate how many bits it'll take to append single FDD UARFCN */
+static inline int append_utran_fdd_length(uint16_t u, 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);
+}
+
+/* Append multiple FDD UARFCNs */
+static inline int append_uarfcns(struct bitvec *bv, struct gsm_bts *bts, uint8_t budget)
+{
+ const uint16_t *u = bts->si_common.data.uarfcn_list, *sc = bts->si_common.data.scramble_list;
+ int i, j, k, rc, st = 0, a[bts->si_common.uarfcn_length];
+ uint16_t cu = u[bts->u_offset]; /* caller ensures that length is positive */
+ uint8_t rem = budget - 7, offset_diff; /* account for constant bits right away */
+
+ OSMO_ASSERT(budget <= SI2Q_MAX_LEN);
+
+ if (budget <= 7)
+ return -ENOMEM;
+
+ /* 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 = bts->u_offset; i < bts->si_common.uarfcn_length; i++) {
+ offset_diff = 0;
+ for (j = st, k = 0; j < i; j++) {
+ a[k++] = sc[j]; /* copy corresponding SCs */
+ offset_diff++; /* compute proper offset step */
+ }
+ if (u[i] != cu) { /* we've reached new UARFCN */
+ rc = append_utran_fdd_length(cu, a, bts->si_common.uarfcn_length, k);
+ if (rc < 0) { /* estimate bit length requirements */
+ return rc;
+ }
+
+ if (rem - rc <= 0)
+ break; /* we have ran out of budget in current SI2q */
+ else {
+ rem -= append_utran_fdd(bv, cu, a, k);
+ bts->u_offset += offset_diff;
+ }
+ cu = u[i];
+ st = i; /* update start position */
+ }
+ }
+
+ if (rem > 22) { /* add last UARFCN not covered by previous cycle if it could possibly fit into budget */
+ offset_diff = 0;
+ for (i = st, k = 0; i < bts->si_common.uarfcn_length; i++) {
+ a[k++] = sc[i];
+ offset_diff++;
+ }
+ rc = append_utran_fdd_length(cu, a, bts->si_common.uarfcn_length, k);
+ if (rc < 0) {
+ return rc;
+ }
+
+ if (rem - rc >= 0) {
+ rem -= append_utran_fdd(bv, cu, a, k);
+ bts->u_offset += offset_diff;
+ }
+ }
+
+ /* stop bit - end of Repeated UTRAN FDD Neighbour Cells */
+ bitvec_set_bit(bv, 0);
+
+ /* UTRAN TDD Description */
+ bitvec_set_bit(bv, 0);
+
+ return 0;
+}
+
+/* generate SI2quater rest octets: 3GPP TS 44.018 ยง 10.5.2.33b */
+int rest_octets_si2quater(uint8_t *data, struct gsm_bts *bts)
+{
+ int rc;
+ struct bitvec bv;
+
+ if (bts->si2q_count < bts->si2q_index)
+ return -EINVAL;
+
+ bv.data = data;
+ bv.data_len = 20;
+ bitvec_zero(&bv);
+
+ /* BA_IND */
+ bitvec_set_bit(&bv, 1);
+ /* 3G_BA_IND */
+ bitvec_set_bit(&bv, 1);
+ /* MP_CHANGE_MARK */
+ bitvec_set_bit(&bv, 0);
+
+ /* SI2quater_INDEX */
+ bitvec_set_uint(&bv, bts->si2q_index, 4);
+ /* SI2quater_COUNT */
+ bitvec_set_uint(&bv, bts->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 && bts->si_common.uarfcn_length - bts->u_offset > 0) {
+ rc = append_uarfcns(&bv, bts, rc);
+ if (rc < 0) {
+ LOGP(DRR, LOGL_ERROR, "SI2quater [%u/%u]: failed to append %zu UARFCNs due to range encoding "
+ "failure: %s\n",
+ bts->si2q_index, bts->si2q_count, bts->si_common.uarfcn_length, strerror(-rc));
+ return 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(&bts->si_common.si2quater_neigh_list) - bts->e_offset > 0)
+ append_earfcn(&bv, bts, 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 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 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 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 SI3 Rest Octests (Chapter 10.5.2.34 / Table 10.4.72) */
+int rest_octets_si3(uint8_t *data, const struct 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 controlled by
+ * early_cm_ctrl above */
+ 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 gsm48_lsa_params *lsa_params)
+{
+ /* FIXME */
+ return -1;
+}
+
+/* Generate SI4 Rest Octets (Chapter 10.5.2.35) */
+int rest_octets_si4(uint8_t *data, const struct 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 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 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 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 rest_octets_si13(uint8_t *data, const struct 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);
+ }
+ if (!si13->pbcch_present) {
+ /* PBCCH not present in cell */
+ bitvec_set_bit(&bv, 0);
+ bitvec_set_uint(&bv, si13->no_pbcch.rac, 8);
+ bitvec_set_bit(&bv, si13->no_pbcch.spgc_ccch_sup);
+ bitvec_set_uint(&bv, si13->no_pbcch.prio_acc_thr, 3);
+ bitvec_set_uint(&bv, si13->no_pbcch.net_ctrl_ord, 2);
+ append_gprs_cell_opt(&bv, &si13->cell_opts);
+ append_gprs_pwr_ctrl_pars(&bv, &si13->pwr_ctrl_pars);
+ } else {
+ /* PBCCH present in cell */
+ bitvec_set_bit(&bv, 1);
+ bitvec_set_uint(&bv, si13->pbcch.psi1_rep_per, 4);
+ /* PBCCH Descripiton */
+ bitvec_set_uint(&bv, si13->pbcch.pb, 4);
+ bitvec_set_uint(&bv, si13->pbcch.tsc, 3);
+ bitvec_set_uint(&bv, si13->pbcch.tn, 3);
+ switch (si13->pbcch.carrier_type) {
+ case PBCCH_BCCH:
+ bitvec_set_bit(&bv, 0);
+ bitvec_set_bit(&bv, 0);
+ break;
+ case PBCCH_ARFCN:
+ bitvec_set_bit(&bv, 0);
+ bitvec_set_bit(&bv, 1);
+ bitvec_set_uint(&bv, si13->pbcch.arfcn, 10);
+ break;
+ case PBCCH_MAIO:
+ bitvec_set_bit(&bv, 1);
+ bitvec_set_uint(&bv, si13->pbcch.maio, 6);
+ break;
+ }
+ }
+ /* 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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 22:23:23 +0000