7.2.4 Functional requirements of MSC
23.0183GPPBasic call handlingRelease 17Technical realizationTS
7.2.4.1 Process Prepage_MSC
7.2.4.2 Procedure Prepaging_Page_MS_MSC
The test "MS connection exists" takes the "Yes" exit if there is a radio connection established between the MS and the network.
The test "MS busy" takes the "Yes" exit if the MS is engaged on a circuit-switched call.
The signal input "MS connection established" indicates that the MS has responded to paging, or sent a CM service request for anything other than a circuit-switched call, or completed the location registration procedure.
7.2.4.3 Prepaging_Search_For_MS_MSC
The test "MS connection exists" takes the "Yes" exit if there is a radio connection established between the MS and the network.
The test "MS busy" takes the "Yes" exit if the MS is engaged on a circuit-switched call.
The signal input "MS connection established" indicates that the MS has responded to paging, or sent a CM service request for anything other than a circuit-switched call, or completed the location registration procedure.
7.2.4.4 Process OSI_MSC
If the MS is engaged on a circuit-switched call, the state is busy, otherwise assumed idle.
7.2.4.5 Process RCL_MSC
This process runs when the MSC receives a Page MS message or a Search for MS message with a Page type indicating Active Info Retrieval.
7.2.4.6 Procedure Active_Info_Retrieval_Page_MSC
The test "MS connection exists" takes the "Yes" exit if there is a radio connection established between the MS and the network.
The test "GSM Access" takes the "Yes" exit if the MS is using a GSM radio access to communicate with the network.
The test "Report on change of service area?" takes the "Yes" exit if the MSC has performed the Location Reporting Control procedure (see 3GPP TS 25.413 [27]) with the Request Type IE set to "Change of service area".
If the test "Report on change of service area?" takes the "No" exit the MSC shall perform a Location Reporting Control procedure with the Request Type IE set to "Direct".
7.2.4.7 Procedure Active_Info_Retrieval_Search_MSC
The test "MS connection exists" takes the "Yes" exit if there is a radio connection established between the MS and the network.
The test "GSM Access" takes the "Yes" exit if the MS is using a GSM radio access to communicate with the network.
The test "Report on change of service area?" takes the "Yes" exit if the MSC has performed the Location Reporting Control procedure (see 3GPP TS 25.413 [26]) with the Request Type IE set to "Change of service area".
If the test "Report on change of service area?" takes the "No" exit the MSC shall perform a Location Reporting Control procedure with the Request Type IE set to "Direct".
7.2.4.8 Procedure Retrieve_IMEI_If_Required
If the IMEI is retrieved using an existing connection between the MS and the network (as opposed to a connection which has been set up for active information retrieval), the Release transaction signal is relayed to the MSC process which is supervising the existing connection.
Figure 60: Process Prepage_MSC
Figure 61: Procedure Prepaging_Page_MS_MSC
Figure 62: Procedure Prepaging_Search_For_MS_MSC
Figure 63: Process OSI_MSC
Figure 64: Process AIR_MSC
Figure 65: Procedure Active_Info_Retrieval_Page_MSC
Figure 66: Procedure Active_Info_Retrieval_Search_MSC
Figure 66bis: Procedure Retrieve_IMEI_If_Required