Inactivity Timer Adjustment for VoIMS Call Setup
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Solution Overview
Problem
In LTE mobile communication systems, voice data is often lost during call setup, leading to degraded quality of service due to disconnection between calling and called UEs before the called party starts speaking, resulting in voice media drop.
Innovation Solution
Implementing an inactivity timer with a larger initial value for UEs using VoIMS services to maintain connection from the moment a call is initiated until the called party answers, preventing premature disconnection and ensuring continuous data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an inactivity timer is used to manage UE connections, then connection management efficiency is improved, but voice data loss occurs during call setup due to premature disconnection
Solution Approach 1:
The patent dynamically adjusts the inactivity timer value based on service type. For VoIMS services, a first (larger) inactivity timer value is configured, while for other services a second (smaller) timer value is used. This dynamic adjustment allows the system to maintain connection during call setup for voice services while efficiently managing connections for other services, thus resolving the contradiction between connection management efficiency and voice data transmission reliability.
Solution Approach 2:
The patent changes the timer parameter based on the service being performed. When a UE performs a VoIMS service, the inactivity timer is set to a larger value to prevent premature disconnection during call setup. This parameter change ensures that the connection remains active throughout the call establishment process, preventing voice media drop while still allowing efficient connection management for non-voice services.
2Reliability
If the inactivity timer value is increased to prevent disconnection, then voice call quality is improved, but network resource occupation increases
Solution Approach 1:
The patent applies different inactivity timer values to different services locally. Instead of using a uniformly large timer value for all services, the system configures a first (larger) timer value specifically for VoIMS services and a second (smaller) timer value for other services. This localized quality adjustment ensures that network resources are occupied for the necessary duration only when voice services are active, preventing unnecessary resource occupation while maintaining voice call quality.
Solution Approach 2:
The patent changes the inactivity timer parameter based on service type to optimize resource usage. By setting a larger timer value only when VoIMS services are detected and using a smaller value for other services, the system maintains voice call quality while minimizing overall network resource occupation. This conditional parameter change ensures resources are allocated appropriately based on actual service requirements.
Data Source
AI summary
A method and apparatus is provided that improves the quality of voice calls in a mobile communication network. The method of performing transmission/reception of signals in an evolved Node B (eNB) of a mobile communication system includes: receiving a first message including service request information from user equipment (UE); transmitting a second message including the service request information to an Mobility Management Entity (MME); receiving a third message including context information for the UE from the MME; and determining an inactivity timer value for the UE based on the context information. The method and apparatus can maintain, when a voice call is created, connection with calling UE from when the called UE answers the call until the call is set up, thereby preventing part of a caller's voice data from being lost.