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osmo-sgsn
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Use 04.08 IMM ASS REJECT in case we run out of channels 

If the user has a non-zero 'timer t3122' in the config file, we will
send an IMM ASS REJECT in case we run out of resources.
This commit is contained in:
Harald Welte 2010-12-23 14:39:29 +01:00
parent d0d2b0b605
commit 2862dcac58
3 changed files with 45 additions and 1 deletions
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1
openbsc/include/openbsc/gsm_data.h
View File

@ -710,6 +710,7 @@ struct gsm_network {
int T3115;
int T3117;
int T3119;
int T3122;
int T3141;
/* Radio Resource Location Protocol (TS 04.31) */

43
openbsc/src/abis_rsl.c
View File

@ -1152,6 +1152,45 @@ static void t3111_expired(void *data)
#define GSM48_LEN2PLEN(a) (((a) << 2) | 1)
/* Format an IMM ASS REJ according to 04.08 Chapter 9.1.20 */
static int rsl_send_imm_ass_rej(struct gsm_bts *bts,
unsigned int num_req_refs,
struct gsm48_req_ref *rqd_refs,
uint8_t wait_ind)
{
uint8_t buf[GSM_MACBLOCK_LEN];
struct gsm48_imm_ass_rej *iar = (struct gsm48_imm_ass_rej *)buf;
/* create IMMEDIATE ASSIGN REJECT 04.08 message */
memset(iar, 0, sizeof(*iar));
iar->proto_discr = GSM48_PDISC_RR;
iar->msg_type = GSM48_MT_RR_IMM_ASS;
iar->page_mode = GSM48_PM_SAME;
memcpy(&iar->req_ref1, &rqd_refs[0], sizeof(iar->req_ref1));
iar->wait_ind1 = wait_ind;
if (num_req_refs >= 2)
memcpy(&iar->req_ref2, &rqd_refs[1], sizeof(iar->req_ref2));
else
memcpy(&iar->req_ref2, &rqd_refs[0], sizeof(iar->req_ref2));
iar->wait_ind2 = wait_ind;
if (num_req_refs >= 3)
memcpy(&iar->req_ref3, &rqd_refs[2], sizeof(iar->req_ref3));
else
memcpy(&iar->req_ref3, &rqd_refs[0], sizeof(iar->req_ref3));
iar->wait_ind3 = wait_ind;
if (num_req_refs >= 4)
memcpy(&iar->req_ref4, &rqd_refs[3], sizeof(iar->req_ref4));
else
memcpy(&iar->req_ref4, &rqd_refs[0], sizeof(iar->req_ref4));
iar->wait_ind4 = wait_ind;
return rsl_imm_assign_cmd(bts, sizeof(iar), (uint8_t *) iar);
}
/* MS has requested a channel on the RACH */
static int rsl_rx_chan_rqd(struct msgb *msg)
{
@ -1197,7 +1236,9 @@ static int rsl_rx_chan_rqd(struct msgb *msg)
LOGP(DRSL, LOGL_NOTICE, "BTS %d CHAN RQD: no resources for %s 0x%x\n",
msg->lchan->ts->trx->bts->nr, gsm_lchant_name(lctype), rqd_ref->ra);
counter_inc(bts->network->stats.chreq.no_channel);
/* FIXME: send some kind of reject ?!? */
/* FIXME gather multiple CHAN RQD and reject up to 4 at the same time */
if (bts->network->T3122)
rsl_send_imm_ass_rej(bts, 1, rqd_ref, bts->network->T3122 & 0xff);
return -ENOMEM;
}

2
openbsc/src/bsc_vty.c
View File

@ -547,6 +547,7 @@ static int config_write_net(struct vty *vty)
vty_out(vty, " timer t3115 %u%s", gsmnet->T3115, VTY_NEWLINE);
vty_out(vty, " timer t3117 %u%s", gsmnet->T3117, VTY_NEWLINE);
vty_out(vty, " timer t3119 %u%s", gsmnet->T3119, VTY_NEWLINE);
vty_out(vty, " timer t3122 %u%s", gsmnet->T3122, VTY_NEWLINE);
vty_out(vty, " timer t3141 %u%s", gsmnet->T3141, VTY_NEWLINE);
vty_out(vty, " dtx-used %u%s", gsmnet->dtx_enabled, VTY_NEWLINE);
@ -1323,6 +1324,7 @@ DECLARE_TIMER(3113, "Set the time to try paging a subscriber.")
DECLARE_TIMER(3115, "Currently not used.")
DECLARE_TIMER(3117, "Currently not used.")
DECLARE_TIMER(3119, "Currently not used.")
DECLARE_TIMER(3122, "Waiting time (seconds) after IMM ASS REJECT")
DECLARE_TIMER(3141, "Currently not used.")
DEFUN(cfg_net_dtx,