163 lines
5.2 KiB
C
163 lines
5.2 KiB
C
/* Paging helper and manager.... */
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/* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef PAGING_H
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#define PAGING_H
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#include <stdlib.h>
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#include <string.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/timer.h>
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#include <osmocom/bsc/gsm_data.h>
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#include <osmocom/bsc/bsc_subscriber.h>
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#include <osmocom/bsc/bsc_msc_data.h>
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struct bsc_msc_data;
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#define LOG_PAGING(PARAMS, SUBSYS, LEVEL, fmt, args...) \
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LOGP(SUBSYS, LEVEL, "(msc=%d) Paging%s: %s: " fmt, \
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(PARAMS)->msc ? (PARAMS)->msc->nr : -1, \
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(PARAMS)->reason == BSC_PAGING_FOR_LCS ? " for LCS" : "", \
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bsc_subscr_name((PARAMS)->bsub), \
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##args)
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#define LOG_PAGING_BTS(PARAMS, BTS, SUBSYS, LEVEL, fmt, args...) \
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LOG_PAGING(PARAMS, SUBSYS, LEVEL, "(bts=%u) " fmt, (BTS) ? (BTS)->nr : 255, ##args)
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#define BSUB_USE_PAGING_START "paging-start"
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#define BSUB_USE_PAGING_REQUEST "paging-req"
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/* Bitmask of reasons for Paging. Each individual Paging via bsc_paging_start() typically has only one of these reasons
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* set, but when a subscriber responds, we need to aggregate all pending Paging reasons (by bitwise-OR). */
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enum bsc_paging_reason {
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BSC_PAGING_NONE = 0,
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BSC_PAGING_FROM_CN = 0x1,
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BSC_PAGING_FOR_LCS = 0x2,
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};
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/* OS#5552, OS#5553: Maximum allowed scheduling transmit delay in paging
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* requests to be queued, in seconds. If calculated delay for requests to be
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* queued goes over this threshold, they are discarded instead of inserted to
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* the queue. This avoids keeping queueing requests which will be scheduled for
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* transmission too late.
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*/
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#define PAGING_THRESHOLD_X3113_DEFAULT_SEC 60
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#define MAX_PAGING_BLOCKS_CCCH 9
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#define MAX_BS_PA_MFRMS 9
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struct bsc_paging_params {
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enum bsc_paging_reason reason;
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struct bsc_msc_data *msc;
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struct bsc_subscr *bsub;
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uint32_t tmsi;
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struct osmo_mobile_identity imsi;
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uint8_t chan_needed;
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struct gsm0808_cell_id_list2 cil;
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};
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/**
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* A pending paging request
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*/
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struct gsm_paging_request {
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/* list_head for list of all paging requests */
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struct llist_head entry;
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/* the subscriber which we're paging. This struct is included using
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* bsub_entry field in list bsub->active_paging_requests */
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struct bsc_subscr *bsub;
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struct llist_head bsub_entry;
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/* back-pointer to the BTS on which we are paging */
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struct gsm_bts *bts;
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/* what kind of channel type do we ask the MS to establish */
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int chan_type;
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/* paging group of the subscriber: */
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uint8_t pgroup;
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/* Timer 3113: how long do we try to page? */
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struct osmo_timer_list T3113;
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/* How often did we ask the BTS to page? */
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int attempts;
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/* Timestamp of last time the subscriber was paged */
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struct timespec last_attempt_ts;
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/* MSC that has issued this paging */
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struct bsc_msc_data *msc;
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enum bsc_paging_reason reason;
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};
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/*
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* This keeps track of the paging status of one BTS. It
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* includes a number of pending requests, a back pointer
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* to the gsm_bts, a timer and some more state.
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*/
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struct gsm_bts_paging_state {
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/* pending requests (initial paging request, no retransmits) */
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struct llist_head initial_req_list;
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/* Number of requests in initial_req_list */
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unsigned int initial_req_list_len;
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/* pending requests (already transmitted at least once) */
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struct llist_head retrans_req_list;
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/* Number of requests in pending_requests_len */
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unsigned int retrans_req_list_len;
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/* Number of requests in initial_req_list, indexed by pgroup. */
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unsigned int initial_req_pgroup_counts[MAX_PAGING_BLOCKS_CCCH * MAX_BS_PA_MFRMS];
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struct gsm_bts *bts;
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struct osmo_timer_list work_timer;
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struct osmo_timer_list credit_timer;
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/* Last time paging worker was triggered */
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struct timespec last_sched_ts;
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/* free chans needed */
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int free_chans_need;
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/* load */
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uint16_t available_slots;
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};
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void paging_global_init(void);
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void paging_init(struct gsm_bts *bts);
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void paging_destructor(struct gsm_bts *bts);
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/* schedule paging request */
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int paging_request_bts(const struct bsc_paging_params *params, struct gsm_bts *bts);
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void paging_request_stop(struct bsc_msc_data **msc_p, enum bsc_paging_reason *reasons_p,
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struct gsm_bts *bts, struct bsc_subscr *bsub);
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void paging_request_cancel(struct bsc_subscr *bsub, enum bsc_paging_reason reasons);
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/* pending paging requests */
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unsigned int paging_pending_requests_nr(const struct gsm_bts *bts);
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void paging_flush_bts(struct gsm_bts *bts, struct bsc_msc_data *msc);
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void paging_flush_network(struct gsm_network *net, struct bsc_msc_data *msc);
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uint16_t paging_estimate_available_slots(const struct gsm_bts *bts, unsigned int time_span_s);
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int bsc_paging_start(struct bsc_paging_params *params);
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#endif
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