User Equipment Session Transfer for Simultaneous Voice and Video
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Solution Overview
Problem
Existing communication technologies do not provide a method for transferring sessions of a user equipment when it is involved in both a voice session and a video session simultaneously, resulting in incomplete session transfer.
Innovation Solution
A session transfer method that determines an active session among the video and voice sessions, sends a circuit switched domain call setup request to the network, acquires a transmission bearer, and uses it to transmit the media stream, allowing for the transfer of both sessions to the circuit switched domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE initiates transfer of only one type of session (voice or video) to the CS domain, then the transfer process is simple, but the other session cannot be transferred
Solution Approach 1:
The patent merges the transfer processes of voice sessions and video sessions into a unified procedure. The UE determines an active session among multiple sessions (voice or video), initiates a single CS domain call setup request that carries session transfer numbers for all sessions, and transfers all sessions together through one coordinated process rather than separate transfer operations.
Solution Approach 2:
The call setup request message is designed to be universal, capable of carrying session transfer numbers for both voice sessions and video sessions simultaneously. The same message structure and transfer mechanism handles multiple session types, making the transfer process multi-functional rather than requiring separate specialized procedures for each session type.
2Adaptability or versatility
If the UE transfers multiple sessions simultaneously to the CS domain, then complete session transfer is achieved, but the transfer process becomes complex
Solution Approach 1:
The patent segments the session transfer process into distinct phases: first, the UE determines the active session among multiple sessions; second, the UE constructs a call setup request with session transfer numbers for all sessions; third, the network executes the transfer. This segmentation allows complex multi-session transfer to be managed through structured, sequential steps rather than a monolithic complex operation.
Solution Approach 2:
The call setup request message acts as an intermediary that carries session transfer numbers for multiple sessions. Instead of requiring separate control messages for each session transfer, this single intermediary message consolidates the transfer information for all sessions (voice and video), simplifying the operation while enabling complete transfer.
Data Source
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AI summary
In the field of communications, a session transfer method and a User Equipment (UE) are provided, so as to solve the problem that when a UE is involved in a voice session and a video session at the same time, session transfer cannot be performed. The technical solution according to the present invention includes: determining a session in an active state among a video session and a voice session; and initiating transfer of the session in the active state, so that a network side transfers the session in the active state to a Circuit Switched (CS) domain, and transfers a session in an inactive state among the video session and the voice session. The session transfer method and the UE may be applied in a radio communication network.