add some document about the channel release procedure
also note how we are not doing what the spec says :)
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GSM 04.08 7.1.7 / 9.1.7 RR CHANNEL RELESE
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RSL 08.58 3.4 / ? RLL Link Release Request
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RSL 08.58 4.6 / 8.4.5 DEACTivate SACCH
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* Deactivate SACCH according to Channel Release Proc 04.08
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* to be sent after RR CHANNEL RELEASE is sent to MS
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RSL 08.58 4.7 / 8.4.14 RF CHANnel RELease
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* tells the BTS to release a radio channel
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* "when an activated radio channel is no longer needed"
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* BTS responds with RF CHANnel RELease ACKnowledge
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GSM 04.08 3.4.13: RR connection release procedure
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* network sends RR CHANNEL RELEASE to MS on the DCCH
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* start T3109
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* deactivate SACCH
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* MS disconnects main signalling link (by sending DISC)
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* all other data links are disconnected by local end link release
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* network receives DISC (BTS sends RLL REL IND to BSC)
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* stop T3109
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* start T3111
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* when T3111 times out, the network can reuse the channls
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* if T3109 times out, the network deactivates the channels
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and can reuse them
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* this probably means simply RF CHANnel RELease
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== Implementation in OpenBSC ==
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chan_alloc.c:lchan_auto_release()
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* checks if use count still > 0 (abort)
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* calls gsm48_send_rr_release()
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* which calls rsl_deact_sacch()
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* calls rsl_release_request()
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* which sends RLL Link Release request
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RX of RELease INDication:
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* call rsl_rf_chan_release() (send RF_CHAN_REL)
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RX of RELease CONFimem:
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* call rsl_rf_chan_release() (send RF_CHAN_REL)
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* RX of RF_CHAN_REL_ACK
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* call lchan_free()
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* subscr_put()
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* delete release_timer
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=== Integration with SMS ===
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* RX of CP_ERROR or unimplemented MT
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* trigger trans_free() which will lchan_auto_release()
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* CP TC1* expired while waiting for CP-ACK
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* trigger trans_free() which will lchan_auto_release()
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* RX of RP_ERROR
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* trigger trans_free() which will lchan_auto_release()
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* TX of CP-ACK in MT DELIVER
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* trigger trans_free() which will lchan_auto_release()
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* RX of CP-ACK in MO SUBMIT
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* trigger trans_free() which will lchan_auto_release()
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* RX of RP-ACK in MT DELIVER (and no more messages)
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* trigger rsl_release_request() for SAPI3
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* RX of RP-SMMA in MT DELIVER (and no more messages)
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* trigger rsl_release_request() for SAPI3
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