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port rest octets encoding code from osmo-bsc

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As part of fixing issue OS#3075, we want to migrate support
for encoding system information from osmo-bsc to libosmocore.

This change ports osmo-bsc code for encoding SI rest octets.

The conversion was a bit tricky in some places because some
functions receive a 'struct gsm_bts' parameter in osmo-bsc.
In this libosmocore version, such functions expect parameters
which correspond to the individual fields of 'struct gsm_bts'
which are used by these functions.

Several structs from osmo-bsc's system_information.h are now
also declared in libosmocore headers, with an added osmo_ prefix
to avoid collisions with existing definitions in osmo-bsc.

Some helpers were ported from osmo-bsc's system_information.c
to libosmocore's gsm48_rest_octets.c. Contrary to osmo-bsc's
implementation they are now only visible within this file.

Unfortunately, this code ported from osmo-bsc lacks unit tests.

Change-Id: I47888965ab11bba1186c21987f1365c9270abeab
Related: OS#3075
changes/89/10189/8
Stefan Sperling 5 years ago committed by Harald Welte
parent fdf8b7b1be
commit bd6e7a9f2d
5 changed files with 1084 additions and 0 deletions
Show Stats Download Patch File Download Diff File

1
include/Makefile.am
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@ -93,6 +93,7 @@ nobase_include_HEADERS = \
osmocom/gsm/gsm48.h \
osmocom/gsm/gsm48_arfcn_range_encode.h \
osmocom/gsm/gsm48_ie.h \
osmocom/gsm/gsm48_rest_octets.h \
osmocom/gsm/gsm_utils.h \
osmocom/gsm/gsup.h \
osmocom/gsm/gsup_sms.h \

39
include/osmocom/gprs/protocol/gsm_04_60.h
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@ -312,3 +312,42 @@ struct gprs_rlc_dl_header_egprs_3 {
#endif
} __attribute__ ((packed));
#endif
/* TS 03.60 Chapter 6.3.3.1: Network Mode of Operation */
enum osmo_gprs_nmo {
GPRS_NMO_I = 0, /* CS pagin on GPRS paging or traffic channel */
GPRS_NMO_II = 1, /* all paging on CCCH */
GPRS_NMO_III = 2, /* no paging coordination */
};
/* TS 04.60 12.24 */
struct osmo_gprs_cell_options {
enum osmo_gprs_nmo nmo;
/* T3168: wait for packet uplink assignment message */
uint32_t t3168; /* in milliseconds */
/* T3192: wait for release of the TBF after reception of the final block */
uint32_t t3192; /* in milliseconds */
uint32_t drx_timer_max;/* in seconds */
uint32_t bs_cv_max;
uint8_t supports_egprs_11bit_rach;
bool ctrl_ack_type_use_block; /* use PACKET CONTROL ACKNOWLEDGMENT */
uint8_t ext_info_present;
struct {
uint8_t egprs_supported;
uint8_t use_egprs_p_ch_req;
uint8_t bep_period;
uint8_t pfc_supported;
uint8_t dtm_supported;
uint8_t bss_paging_coordination;
} ext_info;
};
/* TS 04.60 Table 12.9.2 */
struct osmo_gprs_power_ctrl_pars {
uint8_t alpha;
uint8_t t_avg_w;
uint8_t t_avg_t;
uint8_t pc_meas_chan;
uint8_t n_avg_i;
};

87
include/osmocom/gsm/gsm48_rest_octets.h
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@ -0,0 +1,87 @@
#pragma once
#include <stdbool.h>
#include <osmocom/gsm/sysinfo.h>
#include <osmocom/gprs/protocol/gsm_04_60.h>
/* 16 is the max. number of SI2quater messages according to 3GPP TS 44.018 Table 10.5.2.33b.1:
4-bit index is used (2#1111 = 10#15) */
#define SI2Q_MAX_NUM 16
/* length in bits (for single SI2quater message) */
#define SI2Q_MAX_LEN 160
#define SI2Q_MIN_LEN 18
/* generate SI1 rest octets */
int osmo_gsm48_rest_octets_si1(uint8_t *data, uint8_t *nch_pos, int is1800_net);
int osmo_gsm48_rest_octets_si2quater(uint8_t *data, uint8_t si2q_index, uint8_t si2q_count, const uint16_t *uarfcn_list,
size_t *u_offset, size_t uarfcn_length, uint16_t *scramble_list,
struct osmo_earfcn_si2q *si2quater_neigh_list, size_t *e_offset);
int osmo_gsm48_rest_octets_si2ter(uint8_t *data);
int osmo_gsm48_rest_octets_si2bis(uint8_t *data);
int osmo_gsm48_rest_octets_si6(uint8_t *data, bool is1800_net);
struct osmo_gsm48_si_selection_params {
uint16_t penalty_time:5,
temp_offs:3,
cell_resel_off:6,
cbq:1,
present:1;
};
struct osmo_gsm48_si_power_offset {
uint8_t power_offset:2,
present:1;
};
struct osmo_gsm48_si3_gprs_ind {
uint8_t si13_position:1,
ra_colour:3,
present:1;
};
struct osmo_gsm48_lsa_params {
uint32_t prio_thr:3,
lsa_offset:3,
mcc:12,
mnc:12;
unsigned int present;
};
struct osmo_gsm48_si_ro_info {
struct osmo_gsm48_si_selection_params selection_params;
struct osmo_gsm48_si_power_offset power_offset;
bool si2ter_indicator;
bool early_cm_ctrl;
struct {
uint8_t where:3,
present:1;
} scheduling;
struct osmo_gsm48_si3_gprs_ind gprs_ind;
/* SI 3 specific */
bool early_cm_restrict_3g;
bool si2quater_indicator;
/* SI 4 specific */
struct osmo_gsm48_lsa_params lsa_params;
uint16_t cell_id;
uint8_t break_ind; /* do we have SI7 + SI8 ? */
};
/* Generate SI3 Rest Octests (Chapter 10.5.2.34 / Table 10.4.72) */
int osmo_gsm48_rest_octets_si3(uint8_t *data, const struct osmo_gsm48_si_ro_info *si3);
/* Generate SI4 Rest Octets (Chapter 10.5.2.35) */
int osmo_gsm48_rest_octets_si4(uint8_t *data, const struct osmo_gsm48_si_ro_info *si4, int len);
struct osmo_gsm48_si13_info {
struct osmo_gprs_cell_options cell_opts;
struct osmo_gprs_power_ctrl_pars pwr_ctrl_pars;
uint8_t bcch_change_mark;
uint8_t si_change_field;
uint8_t rac;
uint8_t spgc_ccch_sup;
uint8_t net_ctrl_ord;
uint8_t prio_acc_thr;
};
/* Generate SI13 Rest Octests (Chapter 10.5.2.37b) */
int osmo_gsm48_rest_octets_si13(uint8_t *data, const struct osmo_gsm48_si13_info *si13);

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

8
src/gsm/libosmogsm.map
Unescape View File

@ -273,6 +273,14 @@ gsm414_msgt_names;
gsm48_push_l3hdr;
gsm48_att_tlvdef;
gsm48_cc_msg_name;
gsm48_rest_octets_si1;
gsm48_rest_octets_si2quater;
gsm48_rest_octets_si2ter;
gsm48_rest_octets_si2bis;
gsm48_rest_octets_si6;
gsm48_rest_octets_si3;
gsm48_rest_octets_si4;
gsm48_rest_octets_si13;
gsm48_rr_msg_name;
gsm48_cc_state_name;
gsm48_construct_ra;

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