9.4 Processes used during Active Call

03.873GPPStage 2TSUser-to-User Signalling (UUS)

There are different processes running for UUS3 during active call in serving and remote network. However, this differentiation does not implicitly mean that call originator’s network is serving network. The differentiation is based on which party initiates the UUS3 service. Thus, serving network process shall be used on initiator’s side and remote network process on the opposite end.

9.4.1 Process and procedures in serving MSC

Figure 9.4.1.1 Process Serving_MSC_Handle_UUS_In_Active_Call

This process is used to check UUS3 activation during active call, handle UUS3 flow control and interaction with ECT supplementary service. The process starts during the call setup and checks the content of the Connect message in order to start the UUS3 flow control correctly. If the UUS3 is not activated the process stays in the Idle state and waits UUS3 activation request from the MS.

Figure 9.4.1.2 Procedure UUS_MSC_Check_UUS3_Activation

This procedure is used to handle the dialogue towards the serving VLR when provisioning check is done.

Figure 9.4.1.1: Process Serving_MSC_Handle_UUS_In_Active_Call (sheet 1)

Figure 9.4.1.1: Process Serving_MSC_Handle_UUS_In_Active_Call (sheet 2)

Figure 9.4.1.1: Process Serving_MSC_Handle_UUS_In_Active_Call (sheet 3)

Figure 9.4.1.1: Process Serving_MSC_Handle_UUS_In_Active_Call (sheet 4)

Figure 9.4.1.2: Procedure UUS_MSC_Check_UUS3_Activation

9.4.2 Process and procedures in serving VLR

Figure 9.4.2.1 Process Serving_VLR_Handle_UUS_In_Active_Call

This process is running in the serving VLR. If the UUS3 activation request comes during the active call, this process is used to check whether the service is provisioned to the subscriber.

Figure 9.4.2.1: Process Serving_VLR_Handle_UUS_In_Active_Call

9.4.3 Process and procedures in remote MSC

Figure 9.4.3.1 Process Remote_MSC_Handle_UUS_In_Active_Call

This process is running in the remote MSC. It is used for checking whether UUS3 UUI’s can be passed on and control the flow control for UUS3. The process starts during the call setup and checks the content of the Connect message in order to start the UUS3 flow control correctly. If the UUS3 is not activated the process stays in the Idle state and waits UUS3 activation request from the NW.

Figure 9.4.3.1: Process Remote_MSC_Handle_UUS_In_Active_Call (sheet 1)

Figure 9.4.3.1: Process Remote_MSC_Handle_UUS_In_Active_Call (sheet 2)

Figure 9.4.3.1: Process Remote_MSC_Handle_UUS_In_Active_Call (sheet 3)

Figure 9.4.3.1: Process Remote_MSC_Handle_UUS_In_Active_Call (sheet 4)