CC-messages GSM 04.08/9.3 --------- ALERT MS <-> MSC - indicates that the called user alerting has been initiated CALL_CONFIRMED MS -> MSC - confirms an incoming call request CALL_PROCEEDING MS <- MSC - indicates that the requested call establishment information has been received CONNECT MS <-> MSC - indicates call acceptance by the called user CONNECT_ACKNOWLEDGE MS <-> MSC - indicates that the mobile station or network acknowledges the call DISCONNECT MS <-> MSC - indicates that the end-to-end connection is cleared RELEASE MS <-> MSC - indicates that the mobile station or network intends to release the transaction identifier RELEASE_COMPLETE MS <-> MSC - indicates that the mobile station or network has released the transaction identifier SETUP MS <-> MSC - initiates call establishment MM-messages GSM 04.08/9.2 ---------- AUTHENTICATION_REQUEST MS <- MSC - initiates authentication of the mobile station identity AUTHENTHICATION_RESPONSE MS -> MSC - delivers a calculated response to the network CM_SERVICE_REQ MS -> MSC - requests a service for the connection management sublayer entities LOCATION_UPDATING_ACCEPT MS <- MSC - indicates that location updating in the network has been completed LOCATION_UPD_REQ MS -> MSC - requests update of mobile's location file TMSI_REALLOCATION_COMPLETE MS -> MSC - indicates that reallocation or deletion of a TMSI has taken place RR-messages GSM 04.08/9.1 ---------- ASSIGNMENT_COMMAND MS <- BSC - commands mobile station to change the channel configuration ASSIGNMENT_COMPLETE MS -> BSC - indicates that the mobile station has established the main signalling link CHANNEL_RELEASE MS <- BSC - initiates deactivation of the dedicated channel used CHANNEL_REQUEST MS -> BTS - requests access to network HANDOVER_ACCESS MS -> BTS - accesses network in handover HANDOVER_COMMAND MS <- BSC - commands mobile station to change the channel configuration in handover HANDOVER_COMPLETE MS -> BSC - indicates that the mobile station has established the main signalling link IMMED_ASSIGNMENT MS <- BTS - commands mobile station to the first dedicated channel PAGING_REQUEST_1 MS <- BTS - tells up to two mobiles to access network PAGING_RESPONSE MS -> BSC - response to the paging request message PHYSICAL_INFORMATION MS <- BTS - tells mobile station to stop the sending of access bursts SYSTEM_INFORMATION_TYPE_1 MS <- BTS - tells all idle mobile stations information of network parameters SYSTEM_INFORMATION_TYPE_2 MS <- BTS - tells all idle mobile stations information of network parameters SYSTEM_INFORMATION_TYPE_3 MS <- BTS - tells all idle mobile stations information of network parameters SYSTEM_INFORMATION_TYPE_4 MS <- BTS - tells all idle mobile stations information of network parameters SYSTEM_INFORMATION_TYPE_5 MS <- BTS - tells an active mobile station information of network parameters SYSTEM_INFORMATION_TYPE_6 MS <- BTS - tells an active mobile station information of network parameters BSSAP-messages GSM 08.08/3.2 ------------- ASSIGNMENT_COMPLETE BSC -> MSC - indicates that the requested assignment has been completed correctly ASSIGNMENT_REQUEST BSC <- MSC - requests the BSS to assign radio resource CLEAR_COMMAND BSC <- MSC - instructs the BSS to release the associated dedicated resource CLEAR_COMPLETE BSC -> MSC - inform the MSC that the associated resource has been successfully cleared COMPLETE_L3_INFO BSC -> MSC * - contains the initial layer 3 message of a connection PAGING BSC <- MSC - requests the BSS to page a mobile station * = carries the initial L3-message: LOCATION_UPD_REQ, CM_SERVICE_REQ tai PAGING_RESPONSE BTSM-messages GSM 08.58/8 ------------ CHANNEL_ACTIVATION BTS <- BSC - activates a radio channel CHANNEL_ACTIV_ACK BTS -> BSC - acknowledges the requested channel activation CHANNEL_REQUIRED BTS -> BSC ** - indicates the reception of a CHANNEL_REQUEST message DEACTIVATE_SACCH BTS <- BSC - deactivate the SACCH of an active channel ESTABLISHMENT_IND BTS -> BSC ** - indicates the establishment of a radio link layer connection HANDOVER_DETECTION - indicates the reception of a HANDOVER_ACCESS message IMM_ASSIGNMENT_CMD BTS <- BSC ** - request the transmission of an immediate assignment message PAGING_COMMAND BTS <- BSC ** - request the paging of an MS PHYS_CONTEXT_CONFIRM BTS -> BSC - responds to a PHYS_CONTEXT_REQUEST message PHYS_CONTEXT_REQUEST BTS <- BSC - requests the "physical context" of an active channel RELEASE_INDICATION BTS -> BSC - indicates the release of a radio link layer connection RF_CHANNEL_RELEASE BTS <- BSC - informs that a radio channel is no longer needed RF_CHAN_RELEASE_ACK BTS -> BSC - acknowledges a RF_CHANNEL_RELEASE message DATA_REQUEST BTS <- BSC ** - requests the sending of a L3 message DATA_INDICATION BTS -> BSC ** - requests the sending of a L3 message SACCH_FILLING ** - indicates the new information to be broadcast on SACCH BCCH_INFORMATION - indicates the new information to be broadcast on BCCH ** = may carry upper layer's message others ---- SABM(L2) - opens a layer 2 connection