433 lines
11 KiB
C
433 lines
11 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 <openbsc/gsm_data.h>
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#include <osmocore/bitvec.h>
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#include <openbsc/rest_octets.h>
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/* generate SI1 rest octets */
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int rest_octets_si1(u_int8_t *data, u_int8_t *nch_pos)
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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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bitvec_spare_padding(&bv, 7);
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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 SI3 Rest Octests (Chapter 10.5.2.34 / Table 10.4.72) */
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int rest_octets_si3(u_int8_t *data, const struct gsm48_si_ro_info *si3)
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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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/* Optional Selection Parameters */
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append_selection_params(&bv, &si3->selection_params);
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/* Optional Power Offset */
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append_power_offset(&bv, &si3->power_offset);
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/* Do we have a SI2ter on the BCCH? */
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if (si3->si2ter_indicator)
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bitvec_set_bit(&bv, H);
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else
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bitvec_set_bit(&bv, L);
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/* Early Classmark Sending Control */
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if (si3->early_cm_ctrl)
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bitvec_set_bit(&bv, H);
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else
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bitvec_set_bit(&bv, L);
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/* Do we have a SI Type 9 on the BCCH? */
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if (si3->scheduling.present) {
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bitvec_set_bit(&bv, H);
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bitvec_set_uint(&bv, si3->scheduling.where, 3);
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} else
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bitvec_set_bit(&bv, L);
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/* GPRS Indicator */
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append_gprs_ind(&bv, &si3->gprs_ind);
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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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static int append_lsa_params(struct bitvec *bv,
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const struct gsm48_lsa_params *lsa_params)
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{
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/* FIXME */
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return -1;
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}
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/* Generate SI4 Rest Octets (Chapter 10.5.2.35) */
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int rest_octets_si4(u_int8_t *data, const struct gsm48_si_ro_info *si4)
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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 = 10; /* FIXME: up to ? */
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/* SI4 Rest Octets O */
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append_selection_params(&bv, &si4->selection_params);
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append_power_offset(&bv, &si4->power_offset);
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append_gprs_ind(&bv, &si4->gprs_ind);
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if (0 /* FIXME */) {
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/* H and SI4 Rest Octets S */
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bitvec_set_bit(&bv, H);
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/* LSA Parameters */
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if (si4->lsa_params.present) {
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bitvec_set_bit(&bv, H);
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append_lsa_params(&bv, &si4->lsa_params);
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} else
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bitvec_set_bit(&bv, L);
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/* Cell Identity */
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if (1) {
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bitvec_set_bit(&bv, H);
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bitvec_set_uint(&bv, si4->cell_id, 16);
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} else
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bitvec_set_bit(&bv, L);
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/* LSA ID Information */
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if (0) {
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bitvec_set_bit(&bv, H);
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/* FIXME */
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} else
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bitvec_set_bit(&bv, L);
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} else {
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/* L and break indicator */
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bitvec_set_bit(&bv, L);
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bitvec_set_bit(&bv, si4->break_ind ? H : L);
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}
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return bv.data_len;
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}
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/* GPRS Mobile Allocation as per TS 04.60 Chapter 12.10a:
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< GPRS Mobile Allocation IE > ::=
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< HSN : bit (6) >
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{ 0 | 1 < RFL number list : < RFL number list struct > > }
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{ 0 < MA_LENGTH : bit (6) >
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< MA_BITMAP: bit (val(MA_LENGTH) + 1) >
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| 1 { 0 | 1 <ARFCN index list : < ARFCN index list struct > > } } ;
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< RFL number list struct > :: =
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< RFL_NUMBER : bit (4) >
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{ 0 | 1 < RFL number list struct > } ;
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< ARFCN index list struct > ::=
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< ARFCN_INDEX : bit(6) >
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{ 0 | 1 < ARFCN index list struct > } ;
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*/
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static int append_gprs_mobile_alloc(struct bitvec *bv)
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{
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/* Hopping Sequence Number */
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bitvec_set_uint(bv, 0, 6);
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if (0) {
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/* We want to use a RFL number list */
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bitvec_set_bit(bv, 1);
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/* FIXME: RFL number list */
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} else
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bitvec_set_bit(bv, 0);
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if (0) {
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/* We want to use a MA_BITMAP */
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bitvec_set_bit(bv, 0);
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/* FIXME: MA_LENGTH, MA_BITMAP, ... */
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} else {
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bitvec_set_bit(bv, 1);
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if (0) {
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/* We want to provide an ARFCN index list */
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bitvec_set_bit(bv, 1);
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/* FIXME */
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} else
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bitvec_set_bit(bv, 0);
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}
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return 0;
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}
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static int encode_t3192(unsigned int t3192)
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{
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if (t3192 == 0)
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return 3;
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else if (t3192 <= 80)
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return 4;
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else if (t3192 <= 120)
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return 5;
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else if (t3192 <= 160)
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return 6;
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else if (t3192 <= 200)
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return 7;
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else if (t3192 <= 500)
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return 0;
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else if (t3192 <= 1000)
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return 1;
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else if (t3192 <= 1500)
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return 2;
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else
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return -EINVAL;
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}
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static int encode_drx_timer(unsigned int drx)
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{
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if (drx == 0)
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return 0;
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else if (drx == 1)
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return 1;
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else if (drx == 2)
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return 2;
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else if (drx <= 4)
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return 3;
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else if (drx <= 8)
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return 4;
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else if (drx <= 16)
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return 5;
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else if (drx <= 32)
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return 6;
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else if (drx <= 64)
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return 7;
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else
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return -EINVAL;
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}
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/* GPRS Cell Options as per TS 04.60 Chapter 12.24
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< GPRS Cell Options IE > ::=
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< NMO : bit(2) >
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< T3168 : bit(3) >
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< T3192 : bit(3) >
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< DRX_TIMER_MAX: bit(3) >
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< ACCESS_BURST_TYPE: bit >
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< CONTROL_ACK_TYPE : bit >
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< BS_CV_MAX: bit(4) >
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{ 0 | 1 < PAN_DEC : bit(3) >
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< PAN_INC : bit(3) >
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< PAN_MAX : bit(3) >
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{ 0 | 1 < Extension Length : bit(6) >
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< bit (val(Extension Length) + 1
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& { < Extension Information > ! { bit ** = <no string> } } ;
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< Extension Information > ::=
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{ 0 | 1 < EGPRS_PACKET_CHANNEL_REQUEST : bit >
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< BEP_PERIOD : bit(4) > }
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< PFC_FEATURE_MODE : bit >
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< DTM_SUPPORT : bit >
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<BSS_PAGING_COORDINATION: bit >
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<spare bit > ** ;
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*/
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static int append_gprs_cell_opt(struct bitvec *bv,
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const struct gprs_cell_options *gco)
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{
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int t3192, drx_timer_max;
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t3192 = encode_t3192(gco->t3192);
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if (t3192 < 0)
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return t3192;
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drx_timer_max = encode_drx_timer(gco->drx_timer_max);
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if (drx_timer_max < 0)
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return drx_timer_max;
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bitvec_set_uint(bv, gco->nmo, 2);
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bitvec_set_uint(bv, gco->t3168 / 500, 3);
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bitvec_set_uint(bv, t3192, 3);
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bitvec_set_uint(bv, drx_timer_max, 3);
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/* ACCESS_BURST_TYPE: Hard-code 8bit */
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bitvec_set_bit(bv, 0);
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/* CONTROL_ACK_TYPE: Hard-code to RLC/MAC control block */
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bitvec_set_bit(bv, 1);
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bitvec_set_uint(bv, gco->bs_cv_max, 4);
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if (0) {
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/* hard-code no PAN_{DEC,INC,MAX} */
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bitvec_set_bit(bv, 0);
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} else {
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/* copied from ip.access BSC protocol trace */
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bitvec_set_bit(bv, 1);
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bitvec_set_uint(bv, 1, 3); /* DEC */
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bitvec_set_uint(bv, 1, 3); /* INC */
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bitvec_set_uint(bv, 15, 3); /* MAX */
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}
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if (!gco->ext_info_present) {
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/* no extension information */
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bitvec_set_bit(bv, 0);
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} else {
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/* extension information */
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bitvec_set_bit(bv, 1);
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if (!gco->ext_info.egprs_supported) {
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/* 6bit length of extension */
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bitvec_set_uint(bv, (1 + 3)-1, 6);
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/* EGPRS supported in the cell */
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bitvec_set_bit(bv, 0);
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} else {
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/* 6bit length of extension */
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bitvec_set_uint(bv, (1 + 5 + 3)-1, 6);
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/* EGPRS supported in the cell */
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bitvec_set_bit(bv, 1);
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/* 1bit EGPRS PACKET CHANNEL REQUEST */
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bitvec_set_bit(bv, gco->ext_info.use_egprs_p_ch_req);
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/* 4bit BEP PERIOD */
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bitvec_set_uint(bv, gco->ext_info.bep_period, 4);
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}
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bitvec_set_bit(bv, gco->ext_info.pfc_supported);
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bitvec_set_bit(bv, gco->ext_info.dtm_supported);
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bitvec_set_bit(bv, gco->ext_info.bss_paging_coordination);
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}
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return 0;
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}
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static void append_gprs_pwr_ctrl_pars(struct bitvec *bv,
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const struct gprs_power_ctrl_pars *pcp)
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{
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bitvec_set_uint(bv, pcp->alpha, 4);
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bitvec_set_uint(bv, pcp->t_avg_w, 5);
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bitvec_set_uint(bv, pcp->t_avg_t, 5);
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bitvec_set_uint(bv, pcp->pc_meas_chan, 1);
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bitvec_set_uint(bv, pcp->n_avg_i, 4);
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}
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/* Generate SI13 Rest Octests (04.08 Chapter 10.5.2.37b) */
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int rest_octets_si13(u_int8_t *data, const struct gsm48_si13_info *si13)
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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 = 20;
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if (0) {
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/* No rest octets */
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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_set_uint(&bv, si13->bcch_change_mark, 3);
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bitvec_set_uint(&bv, si13->si_change_field, 4);
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if (1) {
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bitvec_set_bit(&bv, 0);
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} else {
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bitvec_set_bit(&bv, 1);
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bitvec_set_uint(&bv, si13->bcch_change_mark, 2);
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append_gprs_mobile_alloc(&bv);
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}
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if (!si13->pbcch_present) {
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/* PBCCH not present in cell */
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bitvec_set_bit(&bv, 0);
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bitvec_set_uint(&bv, si13->no_pbcch.rac, 8);
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bitvec_set_bit(&bv, si13->no_pbcch.spgc_ccch_sup);
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bitvec_set_uint(&bv, si13->no_pbcch.prio_acc_thr, 3);
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bitvec_set_uint(&bv, si13->no_pbcch.net_ctrl_ord, 2);
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append_gprs_cell_opt(&bv, &si13->cell_opts);
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append_gprs_pwr_ctrl_pars(&bv, &si13->pwr_ctrl_pars);
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} else {
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/* PBCCH present in cell */
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bitvec_set_bit(&bv, 1);
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bitvec_set_uint(&bv, si13->pbcch.psi1_rep_per, 4);
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/* PBCCH Descripiton */
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bitvec_set_uint(&bv, si13->pbcch.pb, 4);
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bitvec_set_uint(&bv, si13->pbcch.tsc, 3);
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bitvec_set_uint(&bv, si13->pbcch.tn, 3);
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switch (si13->pbcch.carrier_type) {
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case PBCCH_BCCH:
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bitvec_set_bit(&bv, 0);
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bitvec_set_bit(&bv, 0);
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break;
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case PBCCH_ARFCN:
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bitvec_set_bit(&bv, 0);
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bitvec_set_bit(&bv, 1);
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bitvec_set_uint(&bv, si13->pbcch.arfcn, 10);
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break;
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case PBCCH_MAIO:
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bitvec_set_bit(&bv, 1);
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bitvec_set_uint(&bv, si13->pbcch.maio, 6);
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break;
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}
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}
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/* 3GPP TS 44.018 Release 6 / 10.5.2.37b */
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bitvec_set_bit(&bv, H); /* added Release 99 */
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/* claim our SGSN is compatible with Release 99, as EDGE and EGPRS
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* was only added in this Release */
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bitvec_set_bit(&bv, 1);
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}
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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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