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paging: Document 'ccch_load_ind_period * 2' value 

Change-Id: Ie88bb0f9859bcf4b3b4a07ccf3b1791cb50163f1
This commit is contained in:
Pau Espin 2022-04-29 17:10:57 +02:00
parent 4821c9f4df
commit ad1f436512
1 changed files with 13 additions and 5 deletions
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18
src/osmo-bsc/paging.c
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@ -73,6 +73,11 @@ static const struct timespec retrans_period = {
.tv_nsec = 500 * 1000 * 1000, .tv_nsec = 500 * 1000 * 1000,
}; };
/* If no CCCH Lod Ind is received before this time period, the BTS is considered
* to have stopped sending CCCH Load Indication, probaby due to being under Load
* Threshold: */
#define bts_no_ccch_load_ind_timeout_sec(bts) ((bts)->ccch_load_ind_period * 2)
/* /*
* Kill one paging request update the internal list... * Kill one paging request update the internal list...
*/ */
@ -132,13 +137,14 @@ static void paging_give_credit(void *data)
{ {
struct gsm_bts_paging_state *paging_bts_st = data; struct gsm_bts_paging_state *paging_bts_st = data;
struct gsm_bts *bts = paging_bts_st->bts; struct gsm_bts *bts = paging_bts_st->bts;
uint16_t estimated_slots = paging_estimate_available_slots(bts, bts->ccch_load_ind_period * 2); unsigned int load_ind_timeout = bts_no_ccch_load_ind_timeout_sec(bts);
uint16_t estimated_slots = paging_estimate_available_slots(bts, load_ind_timeout);
LOG_BTS(bts, DPAG, LOGL_INFO, LOG_BTS(bts, DPAG, LOGL_INFO,
"Timeout waiting for CCCH Load Indication, assuming BTS is below Load Threshold (available_slots %u -> %u)\n", "Timeout waiting for CCCH Load Indication, assuming BTS is below Load Threshold (available_slots %u -> %u)\n",
paging_bts_st->available_slots, estimated_slots); paging_bts_st->available_slots, estimated_slots);
paging_bts_st->available_slots = estimated_slots; paging_bts_st->available_slots = estimated_slots;
paging_schedule_if_needed(paging_bts_st); paging_schedule_if_needed(paging_bts_st);
osmo_timer_schedule(&bts->paging.credit_timer, bts->ccch_load_ind_period * 2, 0); osmo_timer_schedule(&bts->paging.credit_timer, load_ind_timeout, 0);
} }
/*! count the number of free channels for given RSL channel type required /*! count the number of free channels for given RSL channel type required
@ -294,11 +300,12 @@ void paging_init(struct gsm_bts *bts)
{ {
bts->paging.bts = bts; bts->paging.bts = bts;
bts->paging.free_chans_need = -1; bts->paging.free_chans_need = -1;
bts->paging.available_slots = paging_estimate_available_slots(bts, bts->ccch_load_ind_period * 2); unsigned int load_ind_timeout = bts_no_ccch_load_ind_timeout_sec(bts);
bts->paging.available_slots = paging_estimate_available_slots(bts, load_ind_timeout);
INIT_LLIST_HEAD(&bts->paging.pending_requests); INIT_LLIST_HEAD(&bts->paging.pending_requests);
osmo_timer_setup(&bts->paging.work_timer, paging_worker, &bts->paging); osmo_timer_setup(&bts->paging.work_timer, paging_worker, &bts->paging);
osmo_timer_setup(&bts->paging.credit_timer, paging_give_credit, &bts->paging); osmo_timer_setup(&bts->paging.credit_timer, paging_give_credit, &bts->paging);
osmo_timer_schedule(&bts->paging.credit_timer, bts->ccch_load_ind_period * 2, 0); osmo_timer_schedule(&bts->paging.credit_timer, load_ind_timeout, 0);
} }
/* Called upon the bts struct being freed */ /* Called upon the bts struct being freed */
@ -583,7 +590,8 @@ void paging_update_buffer_space(struct gsm_bts *bts, uint16_t free_slots)
bts->paging.available_slots = free_slots; bts->paging.available_slots = free_slots;
paging_schedule_if_needed(&bts->paging); paging_schedule_if_needed(&bts->paging);
/* Re-arm credit_timer */ /* Re-arm credit_timer */
osmo_timer_schedule(&bts->paging.credit_timer, bts->ccch_load_ind_period * 2, 0); osmo_timer_schedule(&bts->paging.credit_timer,
bts_no_ccch_load_ind_timeout_sec(bts), 0);
} }
/*! Count the number of pending paging requests on given BTS */ /*! Count the number of pending paging requests on given BTS */