channel_release: First attempt to update the doc to new code.
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@ -31,46 +31,65 @@ GSM 04.08 3.4.13: RR connection release procedure
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== Implementation in OpenBSC ==
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THIS IS OUTDATED and will be updated...
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There are two possible reasons a gsm_subscriber_connection
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will be released. One is a network failure, the other is
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the completion of an operation/transaction.
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=== Failure ===
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The BSC API will call the gsm_04_08.c:gsm0408_clear_request callback
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and the MSC part will release all transactions, operations and such
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and the channels will be released as error case.
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=== Success ===
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Every time an 'operation' or 'transaction' is finished msc_release_connection
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will be called and it will determine if the gsm_subscriber_connection can
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be released.
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In case it can be released bsc_api.c:gsm0808_clear will be called
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which will release all lchan's associated with the connection. For the
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primary channel a SACH Deactivate will be send with the release
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reason NORMAL RELEASE.
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bsc_api.c:gsm0808_clear
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* Release a channel used for handover
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* Release the primary lchan with normal release, SACH deactivate
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chan_alloc.c:lchan_release(chan, sach_deactivate, reason)
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* Start release procedure. It is working in steps with callbacks
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coming from the abis_rsl.c code.
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* Release all SAPI's > 0, wait for them to be released
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* Send SACH Deactivate on SAPI=0
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* Finally Release the channel
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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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* Calls internal rsl_handle_release which might release the RF.
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* Informs chan_alloc.c about the release with
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rsl_lchan_rll_release.
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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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* Calls internal rsl_handle_release which might release the RF.
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* Informs chan_alloc.c about the release with
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rsl_lchan_rll_release.
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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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* trigger trans_free() which will msc_release_connection()
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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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* trigger trans_free() which will msc_release_connection()
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* RX of RP_ERROR
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* trigger trans_free() which will lchan_auto_release()
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* trigger trans_free() which will msc_release_connection()
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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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* trigger trans_free() which will msc_release_connection()
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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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* trigger trans_free() which will msc_release_connection()
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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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