SRVCC Bearer Reservation for Radio Resource Optimization
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Solution Overview
Problem
Current SRVCC/vSRVCC procedures face challenges in efficiently managing radio resources when a user equipment has multiple simultaneous IMS sessions, particularly in differentiating between voice-only and video sessions for optimal bearer reservation, leading to inefficient use of radio resources and potential waste of resources.
Innovation Solution
A method and apparatus that involve querying the last active session to determine whether it is voice-only or video, and accordingly reserving a TS11 bearer for voice sessions or a BS30 bearer for video sessions, using Session Initiation Protocol (SIP) signaling messages, to optimize bearer reservation and handover procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single bearer type is reserved for all IMS sessions, then the procedure is simple, but radio resources are wasted when voice-only sessions use multimedia bearers
Solution Approach 1:
The system performs preliminary querying of the IMS session type (voice-only or video) before reserving bearers during handover. This allows the appropriate bearer type to be selected in advance, preventing resource waste while maintaining procedural efficiency.
Solution Approach 2:
The bearer reservation parameter is dynamically changed based on the session type. For voice-only sessions, TS11 bearers are reserved; for video sessions, BS30 bearers are reserved. This parameter adaptation optimizes radio resource usage according to actual session requirements.
2Loss of energy
If the last active session is queried to determine session type, then bearer reservation is optimized, but additional signaling messages are required
Solution Approach 1:
The session type query is performed as a preliminary action during the handover preparation phase, allowing optimized bearer reservation to occur subsequently. This preliminary differentiation enables resource-efficient handover execution.
Solution Approach 2:
SIP signaling messages serve as intermediaries to query and determine the session type. These standardized protocol messages enable efficient information exchange between network entities without requiring complex custom signaling.
3Reliability
If TS11 bearer is reserved for all sessions, then voice calls work reliably, but video sessions cannot utilize appropriate multimedia bearers
Solution Approach 1:
Different bearer types are allocated based on local session characteristics. Voice-only sessions receive TS11 bearers for reliable voice transmission, while video sessions receive BS30 bearers for multimedia capabilities. This localized optimization matches resource allocation to specific session requirements.
Solution Approach 2:
The bearer allocation system dynamically adapts to different session types rather than using a static allocation scheme. The system can switch between TS11 and BS30 bearer reservations based on real-time session characteristics, providing both reliability and adaptability.
Data Source
AI summary
In the area of mobile telecommunications, the performance of single radio voice call continuity (SRVCC) can be enhanced so as to provide video single radio voice call continuity (vSRVCC). Particularly, SRVCC/vSRVCC procedures can be configured for more efficient use of radio resources. A method includes receiving a query to determine in a multi-session scenario whether a last active session is a voice only session or a video session. A method also includes sending a response to the query indicating whether the last active session is the voice only session or the video session.