pespin has submitted this change. ( https://gerrit.osmocom.org/c/osmo-bsc/+/27965 )

Change subject: paging: Increase T3113 based on paging group load in BSC queue ......................................................................

paging: Increase T3113 based on paging group load in BSC queue

Related: OS#5536 Change-Id: I904c008222ddc3d92843d87fb3182c30b484c8a2 --- M include/osmocom/bsc/paging.h M src/osmo-bsc/paging.c 2 files changed, 37 insertions(+), 5 deletions(-)

Approvals: Jenkins Builder: Verified fixeria: Looks good to me, but someone else must approve laforge: Looks good to me, approved

diff --git a/include/osmocom/bsc/paging.h b/include/osmocom/bsc/paging.h index 8d5c9ac..9b63225 100644 --- a/include/osmocom/bsc/paging.h +++ b/include/osmocom/bsc/paging.h @@ -76,6 +76,8 @@ struct gsm_bts *bts; /* what kind of channel type do we ask the MS to establish */ int chan_type; + /* paging group of the subscriber: */ + uint8_t pgroup;

/* Timer 3113: how long do we try to page? */ struct osmo_timer_list T3113; diff --git a/src/osmo-bsc/paging.c b/src/osmo-bsc/paging.c index 993e5df..f2bcf96 100644 --- a/src/osmo-bsc/paging.c +++ b/src/osmo-bsc/paging.c @@ -330,7 +330,9 @@ }

#define GSM51_MFRAME_DURATION_us (51 * GSM_TDMA_FN_DURATION_uS) /* 235365 us */ -static unsigned int calculate_timer_3113(struct gsm_paging_request *req) +static unsigned int paging_estimate_delay_us(struct gsm_bts *bts, unsigned int num_reqs); + +static unsigned int calculate_timer_3113(struct gsm_paging_request *req, unsigned int reqs_before) { unsigned int to_us, to; struct gsm_bts *bts = req->bts; @@ -345,8 +347,6 @@ if (!bts->T3113_dynamic) return d->val;

- /* TODO: take into account load of paging group for req->bsub */ - /* MFRMS defines repeat interval of paging messages for MSs that belong * to same paging group across multiple 51 frame multiframes. * MAXTRANS defines maximum number of RACH retransmissions, spread over @@ -358,6 +358,9 @@ to_us = GSM51_MFRAME_DURATION_us * bs_pa_mfrms + GSM_TDMA_FN_DURATION_uS * rach_tx_integer * rach_max_trans;

+ /* Now add some extra time based on how many requests need to be transmitted before this one: */ + to_us += paging_estimate_delay_us(bts, reqs_before); + /* ceiling in seconds + extra time */ to = (to_us + 999999) / 1000000 + d->val; LOG_PAGING_BTS(req, bts, DPAG, LOGL_DEBUG, "Paging request: T3113 expires in %u seconds\n", to); @@ -375,6 +378,9 @@ struct gsm_bts_paging_state *bts_entry = &bts->paging; struct gsm_paging_request *req, *last_initial_req = NULL; unsigned int t3113_timeout_s; + unsigned int reqs_before_same_pgroup = 0; + uint8_t pgroup = gsm0502_calc_paging_group(&bts->si_common.chan_desc, + str_to_imsi(params->bsub->imsi));

rate_ctr_inc(rate_ctr_group_get_ctr(bts->bts_ctrs, BTS_CTR_PAGING_ATTEMPTED));

@@ -392,8 +398,15 @@ rate_ctr_inc(rate_ctr_group_get_ctr(bts->bts_ctrs, BTS_CTR_PAGING_ALREADY)); return -EEXIST; } - if (req->attempts == 0) + if (req->attempts == 0) { last_initial_req = req; + if (req->pgroup == pgroup) + reqs_before_same_pgroup++; + } else if (last_initial_req == NULL) { + /* If no req with attempts=0 was found, we'll append to end of list, so keep counting. */ + if (req->pgroup == pgroup) + reqs_before_same_pgroup++; + } }

LOG_PAGING_BTS(params, bts, DPAG, LOGL_DEBUG, "Start paging\n"); @@ -405,6 +418,7 @@ bsc_subscr_get(req->bsub, BSUB_USE_PAGING_REQUEST); req->bts = bts; req->chan_type = params->chan_needed; + req->pgroup = pgroup; req->msc = params->msc; osmo_timer_setup(&req->T3113, paging_T3113_expired, req);

@@ -414,7 +428,7 @@ else/* Add in the middle of the list after last_initial_req */ __llist_add(&req->entry, &last_initial_req->entry, last_initial_req->entry.next);

- t3113_timeout_s = calculate_timer_3113(req); + t3113_timeout_s = calculate_timer_3113(req, reqs_before_same_pgroup); osmo_timer_schedule(&req->T3113, t3113_timeout_s, 0); paging_schedule_if_needed(bts_entry);

@@ -598,3 +612,19 @@ available_slots, time_span_s); return available_slots; } + +/*! Conservative estimate of time needed by BTS to schedule a number of paging + * requests (num_reqs), based on current load at the BSC queue (doesn't take into + * account BTs own buffer) */ +static unsigned int paging_estimate_delay_us(struct gsm_bts *bts, unsigned int num_reqs) +{ + unsigned int n_pag_blocks = gsm0502_get_n_pag_blocks(&bts->si_common.chan_desc); + unsigned int n_mframes = (num_reqs + (n_pag_blocks - 1)) / n_pag_blocks; + unsigned int time_us = n_mframes * GSM51_MFRAME_DURATION_us; + /* the multiframes are not consecutive for a paging group, let's add the spacing between: */ + if (n_mframes > 1) { + unsigned int bs_pa_mfrms = (bts->si_common.chan_desc.bs_pa_mfrms + 2); + time_us += (n_mframes - 1) * bs_pa_mfrms * GSM51_MFRAME_DURATION_us; + } + return time_us; +}

1 is the latest approved patch-set. No files were changed between the latest approved patch-set and the submitted one.