MS BTS BSC MSC -------------------------------------------------------------------------- | | | | | CHANNEL_REQUEST | | | |-------------------->| | | | | | | | | CHANNEL_REQUIRED | | | |-------------------->| | | | | | | | CHANNEL_ACTIVATION | | | |<--------------------| | | | | | | | CHANNEL_ACTIV_ACK | | | |-------------------->| | | | | | | | IMM_ASSIGNMENT_CMD | | | |<--------------------| | | | | | | IMMED_ASSIGNMENT | | | |<--------------------| | | | | | | | LOCATION_UPD_REQ | | | |-------------------->| | | | | | | | | ESTABLISHMENT_IND | | | |-------------------->| | | | | | | | | COMPLETE_L3_INFO | | | |-------------------->| | | | | | LOCATION_UPDATING_ACCEPT | |<----------------------------------------------------------------| | | | | | | | CLEAR_COMMAND | | | |<--------------------| | | | | | CHANNEL_RELEASE | | |<------------------------------------------| | | | | | | | DEACTIVATE_SACCH | | | |<--------------------| | | | | | | | RELEASE_INDICATION | | | |-------------------->| | | | | | | | RF_CHANNEL_RELEASE | | | |<--------------------| | | | | | | | RF_CHAN_RELEASE_ACK | | | |-------------------->| | | | | | | | | CLEAR_COMPLETE | | | |-------------------->| | | | |
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MS BTS BSC MSC -------------------------------------------------------------------------- | | | | | CHANNEL_REQUEST | | | |-------------------->| | | | | | | | | CHANNEL_REQUIRED | | | |-------------------->| | | | | | | | CHANNEL_ACTIVATION | | | |<--------------------| | | | | | | | CHANNEL_ACTIV_ACK | | | |-------------------->| | | | | | | | IMM_ASSIGNMENT_CMD | | | |<--------------------| | | | | | | IMMED_ASSIGNMENT | | | |<--------------------| | | | | | | | CM_SERVICE_REQ | | | |-------------------->| | | | | | | | | ESTABLISHMENT_IND | | | |-------------------->| | | | | | | | | COMPLETE_L3_INFO | | | |-------------------->| | | | | | CM_SERVICE_ACCEPT | |<----------------------------------------------------------------| | | | | | SETUP | |---------------------------------------------------------------->| | | | | | CALL_PROCEEDING | |<----------------------------------------------------------------| | | | | | | | ASSIGNMENT_REQUEST | | | |<--------------------| | | | | | | PHYS_CONTEXT_REQUEST| | | |<--------------------| | | | | | | | PHYS_CONTEXT_CONFIRM| | | |-------------------->| | | | | | | | CHANNEL_ACTIVATION | | | |<--------------------| | | | | | | | CHANNEL_ACTIV_ACK | | | |-------------------->| | | | | | | ASSIGNMENT_COMMAND | | |<------------------------------------------| | | | | | | SABME(L2) | | | |-------------------->| | | | | | | | | ESTABLISHMENT_IND | | | |-------------------->| | | | | | | ASSIGNMENT_COMPLETE | | |------------------------------------------>| | | | | | | | | ASSIGNMENT_COMPLETE | | | |-------------------->| | | | | | | RF_CHANNEL_RELEASE | | | |<--------------------| | | | | | | | RF_CHAN_RELEASE_ACK | | | |-------------------->| | | | | | | ALERT | |<----------------------------------------------------------------| | | | | | CONNECT | |<----------------------------------------------------------------| | | | | | CONNECT_ACKNOWLEDGE | |---------------------------------------------------------------->| | | | |
MS BTS BSC MSC -------------------------------------------------------------------------- | | | | | | | PAGING | | | |<--------------------| | | | | | | PAGING_COMMAND | | | |<--------------------| | | | | | | PAGING_REQUEST | | | |<--------------------| | | | | | | | CHANNEL_REQUEST | | | |-------------------->| | | | | | | | | CHANNEL_REQUIRED | | | |-------------------->| | | | | | | | CHANNEL_ACTIVATION | | | |<--------------------| | | | | | | | CHANNEL_ACTIV_ACK | | | |-------------------->| | | | | | | | IMM_ASSIGNMENT_CMD | | | |<--------------------| | | | | | | IMMED_ASSIGNMENT | | | |<--------------------| | | | | | | | PAGING_RESPONSE | | | |-------------------->| | | | | | | | | ESTABLISHMENT_IND | | | |-------------------->| | | | | | | | | COMPLETE_L3_INFO | | | |-------------------->| | | | | | SETUP | |<----------------------------------------------------------------| | | | | | CALL_CONFIRMED | |---------------------------------------------------------------->| | | | | | | | ASSIGNMENT_REQUEST | | | |<--------------------| | | | | | | PHYS_CONTEXT_REQUEST| | | |<--------------------| | | | | | | | PHYS_CONTEXT_CONFIRM| | | |-------------------->| | | | | | | | CHANNEL_ACTIVATION | | | |<--------------------| | | | | | | | CHANNEL_ACTIV_ACK | | | |-------------------->| | | | | | | ASSIGNMENT_COMMAND | | |<------------------------------------------| | | | | | | SABME(L2) | | | |-------------------->| | | | | | | | | ESTABLISHMENT_IND | | | |-------------------->| | | | | | | ASSIGNMENT_COMPLETE | | |------------------------------------------>| | | | | | | | | ASSIGNMENT_COMPLETE | | | |-------------------->| | | | | | | RF_CHANNEL_RELEASE | | | |<--------------------| | | | | | | | RF_CHAN_RELEASE_ACK | | | |-------------------->| | | | | | | ALERT | |---------------------------------------------------------------->| | | | | | CONNECT | |---------------------------------------------------------------->| | | | | | CONNECT_ACKNOWLEDGE | |<----------------------------------------------------------------| | | | |
MS BTS BSC MSC -------------------------------------------------------------------------- | | | | | | | | | <<<< NORMAL CALL SETUP >>>> | | | | | | | | | | DISCONNECT | |---------------------------------------------------------------->| | | | | | RELEASE | |<----------------------------------------------------------------| | | | | | RELEASE_COMPLETE | |---------------------------------------------------------------->| | | | | | | | CLEAR_COMMAND | | | |<--------------------| | | | | | CHANNEL_RELEASE | | |<------------------------------------------| | | | | | | | DEACTIVATE_SACCH | | | |<--------------------| | | | | | | | RELEASE_INDICATION | | | |-------------------->| | | | | | | | RF_CHANNEL_RELEASE | | | |<--------------------| | | | | | | | RF_CHAN_RELEASE_ACK | | | |-------------------->| | | | | | | | | CLEAR_COMPLETE | | | |-------------------->| | | | |
MS BTS BSC MSC -------------------------------------------------------------------------- | | | | | | | | | <<<< NORMAL CALL SETUP >>>> | | | | | | | | | | DISCONNECT | |<----------------------------------------------------------------| | | | | | RELEASE | |---------------------------------------------------------------->| | | | | | RELEASE_COMPLETE | |<----------------------------------------------------------------| | | | | | | | CLEAR_COMMAND | | | |<--------------------| | | | | | CHANNEL_RELEASE | | |<------------------------------------------| | | | | | | | DEACTIVATE_SACCH | | | |<--------------------| | | | | | | | RELEASE_INDICATION | | | |-------------------->| | | | | | | | RF_CHANNEL_RELEASE | | | |<--------------------| | | | | | | | RF_CHAN_RELEASE_ACK | | | |-------------------->| | | | | | | | | CLEAR_COMPLETE | | | |-------------------->| | | | |
MS BTS1 BTS2 BSC ------------------------------------------------------------------------- | | | | | | | | | <<<< NORMAL CALL SETUP VIA BTS1 >>>> | | | | | | | | | | | | CHANNEL_ACTIVATION | | | |<--------------------| | | | | | | | CHANNEL_ACTIV_ACK | | | |-------------------->| | | | | | HANDOVER_COMMAND | |<----------------------------------------------------------------| | | | | | HANDOVER_ACCESS | | |------------------------------------------>| | | | | | | | | HANDOVER_DETECTION | | | |-------------------->| | | | | | PHYSICAL_INFORMATION | | |<------------------------------------------| | | | | | | SABME(L2) | | |------------------------------------------>| | | | | | | | | ESTABLISHMENT_IND | | | |-------------------->| | | | | | HANDOVER_COMPLETE | | |---------------------------------------------------------------->| | | | | | | RF_CHANNEL_RELEASE | | |<------------------------------------------| | | | | | | RF_CHAN_RELEASE_ACK | | |------------------------------------------>| | | | |