User Equipment Call Management During SRVCC Handover
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Solution Overview
Problem
During Single Radio Voice Call Continuity (SRVCC) and Reverse Single Radio Voice Call Continuity (rSRVCC) handover procedures in wireless communications systems, the uncertainty of a voice call's access domain poses challenges in managing requests to disconnect or place calls on hold, as the handover procedure's success or failure determines the access domain change.
Innovation Solution
A method and apparatus for user equipment (UE) that includes a user interface and a determination module to assess whether an SRVCC or rSRVCC handover procedure is in progress, allowing appropriate actions to be taken when receiving requests to disconnect or place calls on hold, such as deferring actions until the handover is complete or handling requests locally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE processes call disconnect or hold requests during SRVCC/rSRVCC handover procedures, then user control and responsiveness are improved, but call continuity and reliability deteriorate due to uncertain access domain
Solution Approach 1:
The UE determines whether an SRVCC or rSRVCC handover procedure is currently being performed before processing call disconnect or hold requests. This preliminary check allows the system to identify the uncertain access domain state and adjust request handling accordingly, preventing reliability issues while maintaining user control when safe
Solution Approach 2:
The system dynamically adjusts its handling of call requests based on the current handover state. When a handover procedure is detected, the UE modifies its behavior (e.g., deferring requests, changing access domain, or rejecting requests) to adapt to the uncertain state, thereby maintaining call continuity while still responding to user needs when appropriate
2Reliability
If the UE defers call requests during handover procedures, then call continuity is improved, but user responsiveness and operational efficiency deteriorate
Solution Approach 1:
The UE continuously monitors the handover procedure state and uses this feedback to determine appropriate actions for call requests. This feedback mechanism allows the system to defer requests only when necessary (during active handover) and process them normally when the handover is complete or not ongoing, minimizing unnecessary delays while protecting call continuity
Solution Approach 2:
The system automatically determines whether to defer or process call requests based on its own internal state (handover procedure status) without requiring external control. This self-service approach enables the UE to make real-time decisions about request handling, reducing delays while maintaining reliability through automated state-aware processing
3Productivity
If the UE handles call requests locally during handover, then operational efficiency is improved, but access domain uncertainty causes errors and reliability deteriorates
Solution Approach 1:
Before handling call requests locally, the UE performs a preliminary determination of the handover procedure state. This preliminary action identifies whether local handling is safe or if deferral is necessary, preventing errors caused by access domain uncertainty while maintaining efficient local processing when conditions permit
Data Source
AI summary
A method for managing a call during a handover procedure in a communications system is disclosed. The method is used in a user equipment (UE). The method includes: receiving a request for disconnecting a voice call from an end user; determining whether a Single Radio Voice Call Continuity (SRVCC) or Reverse Single Radio Voice Call Continuity (rSRVCC) handover procedure is being performed; and performing an action for the voice call when the request for disconnecting the voice call is received during the SRVCC or rSRVCC handover procedure.