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Content for  TR 22.952  Word version:  18.0.1

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D UTRAN to GERAN Redirection  $ Change history 

 

D  UTRAN to GERAN Redirection  p. 51

The following Use Cases apply to circuit-switched voice priority call that is redirected from UTRAN to GERAN:

D.1  MO UTRAN to MT UTRAN call  p. 51

A Service User originates a Priority Service call on UTRAN by dialling *SC + DN. The call completes (MT) to a UTRAN user served by the same 3G_MSC. Sufficient UTRAN resources are available for MO and MT. No handover/reversion occurs.

D.2  MO UTRAN to MT (UTRAN to GERAN reversion) call  p. 51

A Service User originates a Priority Service call on UTRAN by dialling *SC + DN. Sufficient UTRAN resources are available for MO. Call completion is attempted to a UTRAN user served by the same 3G_MSC; however, UTRAN resource congestion occurs at MT, and the call reverts (handover with cause value "Directed Retry") to GERAN. For MT, the destination user has a dual-mode (UTRAN, GERAN) UE with subscription to both UTRAN and GERAN.

D.3  MO UTRAN to Trunk call  p. 51

A Service User originates a Priority Service call on UTRAN by dialling *SC + DN. Sufficient UTRAN resources are available for MO. The call is routed on a trunk for a destination not served by the 3G_MSC. No handover/reversion occurs.

D.4  MO (UTRAN to GERAN reversion) to MT UTRAN call  p. 51

A Service User originates a Priority Service call on UTRAN by dialling *SC + DN. UTRAN resource congestion occurs for MO, and the call reverts (handover with cause value "Directed Retry") to GERAN. Sufficient UTRAN resources are available for MT, and the call completes to a UTRAN user served by the same 3G_MSC.

D.5  MO (UTRAN to GERAN reversion) to MT (UTRAN to GERAN reversion) call  p. 51

A Service User originates a Priority Service call on UTRAN by dialling *SC + DN. UTRAN resource congestion occurs for MO and the call reverts (handover with cause value "Directed Retry") to GERAN. Call completion is attempted to a UTRAN user served by the same 3G_MSC; however, UTRAN resource congestion occurs for MT, and the call reverts (handover with cause value "Directed Retry") to GERAN. For MT, the destination user has a dual-mode (UTRAN, GERAN) UE with subscription to both UTRAN and GERAN.
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D.6  MO (UTRAN to GERAN reversion) to Trunk call  p. 51

A Service User originates a Priority Service call on UTRAN by dialling *SC + DN. UTRAN resource congestion occurs for MO, and the call reverts (handover with cause value "Directed Retry") to GERAN. The call is routed on a trunk for a destination not served by the 3G_MSC.

D.7  Incoming NS/EP (trunk) to MT UTRAN call  p. 52

The 3G MSC receives an incoming NS/EP call on a trunk with ISUP signalling. Sufficient UTRAN resources are available for MT, and the call completes to a UTRAN user served by the same 3G_MSC.

D.8  Incoming NS/EP (trunk) to MT (UTRAN to GERAN reversion) call  p. 52

The 3G_MSC receives an incoming NS/EP call on a trunk with ISUP signalling. Call completion is attempted to a UTRAN user served by the same 3G_MSC; however, UTRAN resource congestion occurs for MT, and the call reverts (handover with cause value "Directed Retry") to GERAN. For MT, the destination user has a dual-mode (UTRAN, GERAN) UE with subscription to both UTRAN and GERAN.

D.9  MO UTRAN to MT (UTRAN to GERAN reversion) call, exception UE single mode  p. 52

A Service User originates a Priority Service call on UTRAN by dialling *SC + DN. Sufficient UTRAN resources are available for MO. Call completion is attempted to a UTRAN user served by the same 3G_MSC; however, UTRAN resource congestion occurs for MT, and the call reverts (handover with cause value "Directed Retry") to GERAN. For MT, the destination user has a single-mode (UTRAN) UE, hence the handover fails.

D.10  MO UTRAN to MT (UTRAN to GERAN reversion) call, exception only UTRAN Subscription  p. 52

A Service User originates a Priority Service call on UTRAN by dialling *SC + DN. Sufficient UTRAN resources are available for MO. Call completion is attempted to a UTRAN user served by the same 3G_MSC; however, UTRAN resource congestion occurs for MT, and the call reverts (handover with cause value "Directed Retry") to GERAN. For MT, the destination user has a dual-mode (UTRAN, GERAN) UE with subscription only to UTRAN, hence the handover fails.

$  Change history  p. 53

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