| |
| GSM 04.08 7.1.7 / 9.1.7 RR CHANNEL RELESE |
| |
| RSL 08.58 3.4 / ? RLL Link Release Request |
| |
| RSL 08.58 4.6 / 8.4.5 DEACTivate SACCH |
| * Deactivate SACCH according to Channel Release Proc 04.08 |
| * to be sent after RR CHANNEL RELEASE is sent to MS |
| |
| RSL 08.58 4.7 / 8.4.14 RF CHANnel RELease |
| * tells the BTS to release a radio channel |
| * "when an activated radio channel is no longer needed" |
| * BTS responds with RF CHANnel RELease ACKnowledge |
| |
| |
| GSM 04.08 3.4.13: RR connection release procedure |
| |
| * network sends RR CHANNEL RELEASE to MS on the DCCH |
| * start T3109 |
| * deactivate SACCH |
| * MS disconnects main signalling link (by sending DISC) |
| * all other data links are disconnected by local end link release |
| * network receives DISC (BTS sends RLL REL IND to BSC) |
| * stop T3109 |
| * start T3111 |
| * when T3111 times out, the network can reuse the channls |
| * if T3109 times out, the network deactivates the channels |
| and can reuse them |
| * this probably means simply RF CHANnel RELease |
| |
| |
| == Implementation in OpenBSC == |
| |
| THIS IS OUTDATED and will be updated... |
| |
| chan_alloc.c:lchan_auto_release() |
| * checks if use count still > 0 (abort) |
| * calls gsm48_send_rr_release() |
| * which calls rsl_deact_sacch() |
| * calls rsl_release_request() |
| * which sends RLL Link Release request |
| |
| RX of RELease INDication: |
| * call rsl_rf_chan_release() (send RF_CHAN_REL) |
| |
| RX of RELease CONFimem: |
| * call rsl_rf_chan_release() (send RF_CHAN_REL) |
| |
| * RX of RF_CHAN_REL_ACK |
| * call lchan_free() |
| * subscr_put() |
| * delete release_timer |
| |
| |
| === Integration with SMS === |
| |
| * RX of CP_ERROR or unimplemented MT |
| * trigger trans_free() which will lchan_auto_release() |
| |
| * CP TC1* expired while waiting for CP-ACK |
| * trigger trans_free() which will lchan_auto_release() |
| |
| * RX of RP_ERROR |
| * trigger trans_free() which will lchan_auto_release() |
| |
| * TX of CP-ACK in MT DELIVER |
| * trigger trans_free() which will lchan_auto_release() |
| |
| * RX of CP-ACK in MO SUBMIT |
| * trigger trans_free() which will lchan_auto_release() |
| |
| * RX of RP-ACK in MT DELIVER (and no more messages) |
| * trigger rsl_release_request() for SAPI3 |
| |
| * RX of RP-SMMA in MT DELIVER (and no more messages) |
| * trigger rsl_release_request() for SAPI3 |