User Equipment SRVCC Registration for 5G Circuit-Switched Handover
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Solution Overview
Problem
Current technologies lack a solution for continuing voice or video calls when a 5G network switches over to a circuit-switched network during handover, despite supporting capabilities being exchanged between user equipment and network apparatuses.
Innovation Solution
A User Equipment (UE) includes a controller to generate and transmit registration request messages with specific identification information indicating support for Single Radio Voice Call Continuity (SRVCC) from Next Generation Radio Access Network (NG-RAN) to Universal Terrestrial Radio Access Network (UTRAN), enabling seamless call continuation across different radio access networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capability information exchange is implemented between UE and network apparatuses, then support for voice/video call continuation is improved, but no actual solution exists for handover from 5G to circuit-switched network
Solution Approach 1:
The patent applies preliminary action by having the UE include SRVCC support indication in the registration request message before actual handover occurs. This allows the network to pre-configure and prepare for potential handover scenarios, ensuring call continuation capability is established in advance rather than attempting to resolve handover issues during the actual transition.
2Adaptability or versatility
If SRVCC support indication is included in registration request message, then handover capability is improved, but message structure complexity increases
Solution Approach 1:
The patent merges the SRVCC support indication with the existing registration request message structure. Rather than creating a separate signaling message or complex configuration structure, the capability indication is integrated into the standard registration flow, reducing overall system complexity while maintaining handover support functionality.
Data Source
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AI summary
A User Equipment (UE) includes a controller configured to include first identification information in a registration request message in changing at least Mobile Station Classmark 2 and/or a codec to be supported in a case that the UE supports Single Radio Voice Call Continuity (SRVCC) from a Next Generation Radio Access Network (NG-RAN) to a Universal Terrestrial Radio Access Network (UTRAN), and a transmission and/or reception unit configured to transmit the registration request message including the first identification information to a core network, wherein the first identification information is capability information indicating support of the SRVCC from a Universal Terrestrial Radio Access Network (UTRAN) or a High Speed Packet Access (HSPA) or an Evolved UTRAN (E-UTRAN) or the NG-RAN to a 2G radio access network or the UTRAN. A control method to be performed by a user equipment, an access network apparatus, a core network apparatus, an IMS apparatus is provided to continue a voice call or video call even in a case that a network used by the user equipment is switched between different mobile communication systems including 5th Generation (5G) which is a next-generation mobile communication system.