Reverse SRVCC Pre-Allocated Transport Address for Voice Handover
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Solution Overview
Problem
The existing SRVCC (Single Radio Voice Call Continuity) technologies experience a long voice break during handovers from UTRAN/GERAN to E-UTRAN/HSPA, exceeding the desired performance requirement of 300 ms, which is not satisfactory for seamless voice call continuity.
Innovation Solution
A method and device for performing an rSRVCC (reverse SRVCC) procedure by pre-allocating a transport address for voice media and sending specific messages to network entities to minimize interruption time, including steps for allocating a transport address, setting up a PS voice bearer, and reconfiguring media paths during handover from GERAN/UTRAN to E-UTRAN/HSPA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing SRVCC handover procedure is used, then voice call continuity is provided, but voice break duration exceeds 300 ms
Solution Approach 1:
The patent applies preliminary action by pre-allocating transport addresses for the UE in the target E-UTRAN network before handover occurs. The source GERAN/UTRAN network receives handover preparation messages from the target E-UTRAN that include pre-allocated transport addresses, allowing the media path to be reconfigured in advance. This enables the voice media to be switched to the correct transport address immediately upon handover, reducing voice break duration to below 300 ms while maintaining call continuity.
2Loss of time
If pre-resource allocation is implemented, then voice break is reduced below 300 ms, but signaling complexity increases
Solution Approach 1:
The patent merges the resource allocation process into the existing handover preparation signaling between networks. The target E-UTRAN performs both handover preparation and resource allocation simultaneously, sending a single Handover Preparation Message that contains pre-allocated transport addresses. This consolidation avoids creating separate signaling procedures, thereby reducing overall signaling complexity while achieving pre-resource allocation that reduces voice break duration below 300 ms.
Data Source
AI summary
Method for performing an rSRVCC procedure from UTRAN/GERAN to E-UTRAN/HSPA, comprising steps of: —receiving, a first network entity, a first message from a UE before an rSRVCC handover procedure from URTAN/GERAN to F-E-UTRAN/HSPA involving the UE, the first message containing a pre-allocated transport address to be used for voice after the rSRVCC handover, —sending a second message, during the rSRVCC handover procedure of a voice call, to a second network entity, the second message comprising information related to the transport address of the UE to give an instruction to send the voice media of the call to that transport address.