EPSFB Voice Call Signaling for Timely Voice Bearer Establishment
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Solution Overview
Problem
In the EPSFB scenario, the establishment of a voice bearer is delayed due to network fallback from 5G to 4G, leading to issues like no sound or call drop after the call is connected, affecting user experience.
Innovation Solution
The proposed method involves resource reservation negotiation before the call establishment, ensuring synchronized voice bearer states between terminal devices through specific signaling interactions, including 200 OK and QCI=1, to maintain consistent voice communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device falls back from 5G to 4G network, then the call can be connected, but the voice bearer establishment time is delayed causing no sound or call drop
Solution Approach 1:
The patent applies preliminary action by performing resource reservation negotiation before the actual call establishment. The terminal device sends a resource reservation request during the call setup phase, and the network allocates voice bearer resources in advance. This ensures that when the terminal falls back from 5G to 4G, the voice bearer is already established or can be quickly established, avoiding no sound or call drop issues.
2Loss of time
If resource reservation negotiation is performed before call establishment, then voice bearer establishment is timely, but signaling interaction complexity increases
Solution Approach 1:
The patent merges the resource reservation negotiation process with the existing call establishment signaling流程. The resource reservation request is integrated into the INVITE signaling, and the resource reservation response is included in the 200 OK response. This combining approach avoids creating a separate signaling exchange, thus reducing overall signaling complexity while achieving timely voice bearer establishment.
Data Source
AI summary
A method and an apparatus for improving voice call quality in an EPSFB (Evolved Packet System Fallback) scenario are provided, which are applied to the communication field. This method provides an optimization solution for refreshing a resource reservation state to resolve a problem of dual-terminal no sound, call drop, or call drop after no sound during a call between a caller terminal and a called terminal due to signaling disorder in the EPSFB scenario, effectively improving a success rate for refreshing a call state in the current scenario and ensuring a normal voice for a terminal in an abnormal scenario.