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osmo-bts
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bts: Calculate length of agch queue 

We should calculate allowed length of agch queue,
because bts should send imm assign message
before immediate assignment procedure will be aborted by MS.
Imm assign message can be queued no longer than T3126,
so agch queue length should be equal (T3126 / 51 ) * bs_ag_blks_res.
This commit is contained in:
Ivan Kluchnikov 2014-02-11 02:36:58 +04:00
parent 1e0fca4969
commit 2c1c652915
2 changed files with 39 additions and 1 deletions
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1
include/osmo-bts/gsm_data.h
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@ -50,6 +50,7 @@ struct gsm_bts_role_bts {
uint8_t max_ta;
struct llist_head agch_queue;
int agch_queue_count;
uint8_t agch_queue_len;
struct paging_state *paging_state;
char *bsc_oml_host;
unsigned int rtp_jitter_buf_ms;

39
src/common/bts.c
View File

@ -49,6 +49,15 @@ struct gsm_network bts_gsmnet = {
.num_bts = 0,
};
/* Table 3.1 TS 04.08: Values of parameter S */
static const uint8_t tx_integer[] = {
3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16, 20, 25, 32, 50,
};
static const uint8_t s_values[][2] = {
{ 55, 41 }, { 76, 52 }, { 109, 58 }, { 163, 86 }, { 217, 115 },
};
void *tall_bts_ctx;
int bts_init(struct gsm_bts *bts)
@ -215,9 +224,37 @@ int lchan_init_lapdm(struct gsm_lchan *lchan)
int bts_agch_enqueue(struct gsm_bts *bts, struct msgb *msg)
{
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
struct gsm48_system_information_type_3 *si3;
uint8_t T, S, agch_num, i;
uint8_t T_group = 0;
uint8_t ccch_comb = 0;
if (btsb->agch_queue_count >= 30)
/* calculate length of agch queue
agch_queue_len = ( min( T3126 ) / 51 ) * bs_ag_blks_res
min(T3126) = T + 2*S defined in 04.08 11.1.1
S and T are defined in 04.08 3.3.1.1.2 */
si3 = GSM_BTS_SI(bts, SYSINFO_TYPE_3);
T = si3->rach_control.tx_integer;
for (i = 0; i < 15; i++) {
if (tx_integer[i] == T) {
T_group = i % 5;
break;
}
}
if (si3->control_channel_desc.ccch_conf == 1) {
ccch_comb = 1;
}
S = s_values[T_group][ccch_comb];
agch_num = si3->control_channel_desc.bs_ag_blks_res;
btsb->agch_queue_len = ((T + 2 * S) / 51) * agch_num;
if (btsb->agch_queue_count >= btsb->agch_queue_len) {
LOGP(DRSL, LOGL_NOTICE, "AGCH enqueue count = %d >= %d (drop message)\n",
btsb->agch_queue_count, btsb->agch_queue_len);
return -ENOMEM;
}
msgb_enqueue(&btsb->agch_queue, msg);
btsb->agch_queue_count++;