879 lines
22 KiB
C
879 lines
22 KiB
C
/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface,
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* rest octet handling according to
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* 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
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/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <osmocom/bsc/debug.h>
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#include <osmocom/bsc/gsm_data.h>
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#include <osmocom/core/bitvec.h>
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#include <osmocom/gsm/bitvec_gsm.h>
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#include <osmocom/bsc/rest_octets.h>
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#include <osmocom/bsc/arfcn_range_encode.h>
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#include <osmocom/bsc/system_information.h>
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/* generate SI1 rest octets */
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int rest_octets_si1(uint8_t *data, uint8_t *nch_pos, int is1800_net)
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{
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struct bitvec bv;
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memset(&bv, 0, sizeof(bv));
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bv.data = data;
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bv.data_len = 1;
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if (nch_pos) {
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bitvec_set_bit(&bv, H);
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bitvec_set_uint(&bv, *nch_pos, 5);
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} else
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bitvec_set_bit(&bv, L);
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if (is1800_net)
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bitvec_set_bit(&bv, L);
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else
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bitvec_set_bit(&bv, H);
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bitvec_spare_padding(&bv, 6);
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return bv.data_len;
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}
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/* Append Repeated E-UTRAN Neighbour Cell to bitvec: see 3GPP TS 44.018 Table 10.5.2.33b.1 */
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static inline bool append_eutran_neib_cell(struct bitvec *bv, struct gsm_bts *bts, uint8_t budget)
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{
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const struct osmo_earfcn_si2q *e = &bts->si_common.si2quater_neigh_list;
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unsigned i, skip = 0;
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size_t offset = bts->e_offset;
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int16_t rem = budget - 6; /* account for mandatory stop bit and THRESH_E-UTRAN_high */
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uint8_t earfcn_budget;
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if (budget <= 6)
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return false;
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OSMO_ASSERT(budget <= SI2Q_MAX_LEN);
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/* first we have to properly adjust budget requirements */
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if (e->prio_valid) /* E-UTRAN_PRIORITY: 3GPP TS 45.008*/
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rem -= 4;
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else
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rem--;
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if (e->thresh_lo_valid) /* THRESH_E-UTRAN_low: */
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rem -= 6;
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else
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rem--;
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if (e->qrxlm_valid) /* E-UTRAN_QRXLEVMIN: */
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rem -= 6;
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else
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rem--;
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if (rem < 0)
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return false;
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/* now we can proceed with actually adding EARFCNs within adjusted budget limit */
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for (i = 0; i < e->length; i++) {
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if (e->arfcn[i] != OSMO_EARFCN_INVALID) {
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if (skip < offset) {
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skip++; /* ignore EARFCNs added on previous calls */
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} else {
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earfcn_budget = 17; /* compute budget per-EARFCN */
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if (OSMO_EARFCN_MEAS_INVALID == e->meas_bw[i])
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earfcn_budget++;
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else
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earfcn_budget += 4;
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if (rem - earfcn_budget < 0)
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break;
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else {
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bts->e_offset++;
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rem -= earfcn_budget;
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if (rem < 0)
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return false;
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bitvec_set_bit(bv, 1); /* EARFCN: */
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bitvec_set_uint(bv, e->arfcn[i], 16);
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if (OSMO_EARFCN_MEAS_INVALID == e->meas_bw[i])
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bitvec_set_bit(bv, 0);
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else { /* Measurement Bandwidth: 9.1.54 */
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bitvec_set_bit(bv, 1);
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bitvec_set_uint(bv, e->meas_bw[i], 3);
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}
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}
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}
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}
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}
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/* stop bit - end of EARFCN + Measurement Bandwidth sequence */
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bitvec_set_bit(bv, 0);
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/* Note: we don't support different EARFCN arrays each with different priority, threshold etc. */
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if (e->prio_valid) {
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/* E-UTRAN_PRIORITY: 3GPP TS 45.008*/
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bitvec_set_bit(bv, 1);
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bitvec_set_uint(bv, e->prio, 3);
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} else
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bitvec_set_bit(bv, 0);
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/* THRESH_E-UTRAN_high */
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bitvec_set_uint(bv, e->thresh_hi, 5);
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if (e->thresh_lo_valid) {
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/* THRESH_E-UTRAN_low: */
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bitvec_set_bit(bv, 1);
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bitvec_set_uint(bv, e->thresh_lo, 5);
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} else
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bitvec_set_bit(bv, 0);
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if (e->qrxlm_valid) {
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/* E-UTRAN_QRXLEVMIN: */
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bitvec_set_bit(bv, 1);
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bitvec_set_uint(bv, e->qrxlm, 5);
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} else
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bitvec_set_bit(bv, 0);
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return true;
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}
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static inline void append_earfcn(struct bitvec *bv, struct gsm_bts *bts, uint8_t budget)
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{
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bool appended;
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unsigned int old = bv->cur_bit; /* save current position to make rollback possible */
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int rem = budget - 25;
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if (rem <= 0)
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return;
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OSMO_ASSERT(budget <= SI2Q_MAX_LEN);
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/* Additions in Rel-5: */
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bitvec_set_bit(bv, H);
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/* No 3G Additional Measurement Param. Descr. */
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bitvec_set_bit(bv, 0);
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/* No 3G ADDITIONAL MEASUREMENT Param. Descr. 2 */
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bitvec_set_bit(bv, 0);
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/* Additions in Rel-6: */
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bitvec_set_bit(bv, H);
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/* 3G_CCN_ACTIVE */
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bitvec_set_bit(bv, 0);
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/* Additions in Rel-7: */
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bitvec_set_bit(bv, H);
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/* No 700_REPORTING_OFFSET */
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bitvec_set_bit(bv, 0);
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/* No 810_REPORTING_OFFSET */
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bitvec_set_bit(bv, 0);
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/* Additions in Rel-8: */
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bitvec_set_bit(bv, H);
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/* Priority and E-UTRAN Parameters Description */
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bitvec_set_bit(bv, 1);
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/* No Serving Cell Priority Parameters Descr. */
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bitvec_set_bit(bv, 0);
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/* No 3G Priority Parameters Description */
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bitvec_set_bit(bv, 0);
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/* E-UTRAN Parameters Description */
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bitvec_set_bit(bv, 1);
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/* E-UTRAN_CCN_ACTIVE */
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bitvec_set_bit(bv, 0);
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/* E-UTRAN_Start: 9.1.54 */
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bitvec_set_bit(bv, 1);
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/* E-UTRAN_Stop: 9.1.54 */
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bitvec_set_bit(bv, 1);
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/* No E-UTRAN Measurement Parameters Descr. */
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bitvec_set_bit(bv, 0);
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/* No GPRS E-UTRAN Measurement Param. Descr. */
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bitvec_set_bit(bv, 0);
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/* Note: each of next 3 "repeated" structures might be repeated any
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(0, 1, 2...) times - we only support 1 and 0 */
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/* Repeated E-UTRAN Neighbour Cells */
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bitvec_set_bit(bv, 1);
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appended = append_eutran_neib_cell(bv, bts, rem);
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if (!appended) { /* appending is impossible within current budget: rollback */
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bv->cur_bit = old;
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return;
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}
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/* stop bit - end of Repeated E-UTRAN Neighbour Cells sequence: */
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bitvec_set_bit(bv, 0);
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/* Note: following 2 repeated structs are not supported ATM */
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/* stop bit - end of Repeated E-UTRAN Not Allowed Cells sequence: */
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bitvec_set_bit(bv, 0);
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/* stop bit - end of Repeated E-UTRAN PCID to TA mapping sequence: */
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bitvec_set_bit(bv, 0);
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/* Priority and E-UTRAN Parameters Description ends here */
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/* No 3G CSG Description */
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bitvec_set_bit(bv, 0);
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/* No E-UTRAN CSG Description */
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bitvec_set_bit(bv, 0);
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/* No Additions in Rel-9: */
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bitvec_set_bit(bv, L);
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}
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static inline int f0_helper(int *sc, size_t length, uint8_t *chan_list)
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{
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int w[RANGE_ENC_MAX_ARFCNS] = { 0 };
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return range_encode(ARFCN_RANGE_1024, sc, length, w, 0, chan_list);
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}
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/* Estimate how many bits it'll take to append single FDD UARFCN */
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static inline int append_utran_fdd_length(uint16_t u, const int *sc, size_t sc_len, size_t length)
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{
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uint8_t chan_list[16] = { 0 };
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int tmp[sc_len], f0;
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memcpy(tmp, sc, sizeof(tmp));
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f0 = f0_helper(tmp, length, chan_list);
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if (f0 < 0)
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return f0;
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return 21 + range1024_p(length);
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}
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/* Append single FDD UARFCN */
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static inline int append_utran_fdd(struct bitvec *bv, uint16_t u, int *sc, size_t length)
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{
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uint8_t chan_list[16] = { 0 };
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int f0 = f0_helper(sc, length, chan_list);
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if (f0 < 0)
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return f0;
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/* Repeated UTRAN FDD Neighbour Cells */
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bitvec_set_bit(bv, 1);
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/* FDD-ARFCN */
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bitvec_set_bit(bv, 0);
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bitvec_set_uint(bv, u, 14);
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/* FDD_Indic0: parameter value '0000000000' is a member of the set? */
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bitvec_set_bit(bv, f0);
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/* NR_OF_FDD_CELLS */
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bitvec_set_uint(bv, length, 5);
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f0 = bv->cur_bit;
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bitvec_add_range1024(bv, (struct gsm48_range_1024 *)chan_list);
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bv->cur_bit = f0 + range1024_p(length);
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return 21 + range1024_p(length);
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}
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static inline int try_adding_uarfcn(struct bitvec *bv, struct gsm_bts *bts, uint16_t uarfcn,
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uint8_t num_sc, uint8_t start_pos, uint8_t budget)
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{
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int i, k, rc, a[bts->si_common.uarfcn_length];
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if (budget < 23)
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return -ENOMEM;
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/* copy corresponding Scrambling Codes: range encoder make in-place modifications */
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for (i = start_pos, k = 0; i < num_sc; a[k++] = bts->si_common.data.scramble_list[i++]);
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/* estimate bit length requirements */
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rc = append_utran_fdd_length(uarfcn, a, bts->si_common.uarfcn_length, k);
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if (rc < 0)
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return rc; /* range encoder failure */
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if (budget - rc <= 0)
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return -ENOMEM; /* we have ran out of budget in current SI2q */
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/* compute next offset */
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bts->u_offset += k;
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return budget - append_utran_fdd(bv, uarfcn, a, k);
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}
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/* Append multiple FDD UARFCNs */
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static inline void append_uarfcns(struct bitvec *bv, struct gsm_bts *bts, uint8_t budget)
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{
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const uint16_t *u = bts->si_common.data.uarfcn_list;
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int i, rem = budget - 7, st = bts->u_offset; /* account for constant bits right away */
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uint16_t cu = u[bts->u_offset]; /* caller ensures that length is positive */
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OSMO_ASSERT(budget <= SI2Q_MAX_LEN);
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if (budget <= 7)
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return;
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/* 3G Neighbour Cell Description */
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bitvec_set_bit(bv, 1);
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/* No Index_Start_3G */
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bitvec_set_bit(bv, 0);
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/* No Absolute_Index_Start_EMR */
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bitvec_set_bit(bv, 0);
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/* UTRAN FDD Description */
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bitvec_set_bit(bv, 1);
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/* No Bandwidth_FDD */
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bitvec_set_bit(bv, 0);
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for (i = bts->u_offset; i <= bts->si_common.uarfcn_length; i++)
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if (u[i] != cu) { /* we've reached new UARFCN */
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rem = try_adding_uarfcn(bv, bts, cu, i, st, rem);
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if (rem < 0)
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break;
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if (i < bts->si_common.uarfcn_length) {
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cu = u[i];
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st = i;
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} else
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break;
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}
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/* stop bit - end of Repeated UTRAN FDD Neighbour Cells */
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bitvec_set_bit(bv, 0);
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/* UTRAN TDD Description */
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bitvec_set_bit(bv, 0);
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}
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/* generate SI2quater rest octets: 3GPP TS 44.018 § 10.5.2.33b */
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int rest_octets_si2quater(uint8_t *data, struct gsm_bts *bts)
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{
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int rc;
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struct bitvec bv;
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if (bts->si2q_count < bts->si2q_index)
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return -EINVAL;
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bv.data = data;
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bv.data_len = 20;
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bitvec_zero(&bv);
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/* BA_IND: Set to '0' as that's what we use for SI2xxx type,
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* whereas '1' is used for SI5xxx type messages. The point here
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* is to be able to correlate whether a given MS measurement
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* report was using the neighbor cells advertised in SI2 or in
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* SI5, as those two could very well be different */
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bitvec_set_bit(&bv, 0);
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/* 3G_BA_IND */
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bitvec_set_bit(&bv, 1);
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/* MP_CHANGE_MARK */
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bitvec_set_bit(&bv, 0);
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/* SI2quater_INDEX */
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bitvec_set_uint(&bv, bts->si2q_index, 4);
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/* SI2quater_COUNT */
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bitvec_set_uint(&bv, bts->si2q_count, 4);
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/* No Measurement_Parameters Description */
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bitvec_set_bit(&bv, 0);
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/* No GPRS_Real Time Difference Description */
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bitvec_set_bit(&bv, 0);
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/* No GPRS_BSIC Description */
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bitvec_set_bit(&bv, 0);
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/* No GPRS_REPORT PRIORITY Description */
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bitvec_set_bit(&bv, 0);
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/* No GPRS_MEASUREMENT_Parameters Description */
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bitvec_set_bit(&bv, 0);
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/* No NC Measurement Parameters */
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bitvec_set_bit(&bv, 0);
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/* No extension (length) */
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bitvec_set_bit(&bv, 0);
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rc = SI2Q_MAX_LEN - (bv.cur_bit + 3);
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if (rc > 0 && bts->si_common.uarfcn_length - bts->u_offset > 0)
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append_uarfcns(&bv, bts, rc);
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else /* No 3G Neighbour Cell Description */
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bitvec_set_bit(&bv, 0);
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/* No 3G Measurement Parameters Description */
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bitvec_set_bit(&bv, 0);
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/* No GPRS_3G_MEASUREMENT Parameters Descr. */
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bitvec_set_bit(&bv, 0);
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rc = SI2Q_MAX_LEN - bv.cur_bit;
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if (rc > 0 && si2q_earfcn_count(&bts->si_common.si2quater_neigh_list) - bts->e_offset > 0)
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append_earfcn(&bv, bts, rc);
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else /* No Additions in Rel-5: */
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bitvec_set_bit(&bv, L);
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bitvec_spare_padding(&bv, (bv.data_len * 8) - 1);
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return bv.data_len;
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}
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/* Append selection parameters to bitvec */
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static void append_selection_params(struct bitvec *bv,
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const struct gsm48_si_selection_params *sp)
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{
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if (sp->present) {
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bitvec_set_bit(bv, H);
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bitvec_set_bit(bv, sp->cbq);
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bitvec_set_uint(bv, sp->cell_resel_off, 6);
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bitvec_set_uint(bv, sp->temp_offs, 3);
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bitvec_set_uint(bv, sp->penalty_time, 5);
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} else
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bitvec_set_bit(bv, L);
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}
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/* Append power offset to bitvec */
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static void append_power_offset(struct bitvec *bv,
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const struct gsm48_si_power_offset *po)
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{
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if (po->present) {
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bitvec_set_bit(bv, H);
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bitvec_set_uint(bv, po->power_offset, 2);
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} else
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bitvec_set_bit(bv, L);
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}
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/* Append GPRS indicator to bitvec */
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static void append_gprs_ind(struct bitvec *bv,
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const struct gsm48_si3_gprs_ind *gi)
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{
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if (gi->present) {
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bitvec_set_bit(bv, H);
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bitvec_set_uint(bv, gi->ra_colour, 3);
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/* 0 == SI13 in BCCH Norm, 1 == SI13 sent on BCCH Ext */
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bitvec_set_bit(bv, gi->si13_position);
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} else
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bitvec_set_bit(bv, L);
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}
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/* Generate SI2ter Rest Octests 3GPP TS 44.018 Table 10.5.2.33a.1 */
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int rest_octets_si2ter(uint8_t *data)
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{
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struct bitvec bv;
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memset(&bv, 0, sizeof(bv));
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bv.data = data;
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bv.data_len = 4;
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/* No SI2ter_MP_CHANGE_MARK */
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bitvec_set_bit(&bv, L);
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bitvec_spare_padding(&bv, (bv.data_len * 8) - 1);
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return bv.data_len;
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}
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|
|
/* Generate SI2bis Rest Octests 3GPP TS 44.018 Table 10.5.2.33.1 */
|
|
int 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 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. 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 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);
|
|
}
|
|
/* 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;
|
|
}
|