Voice Call RLF Timing for Faster Handover Recovery
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Solution Overview
Problem
Wireless communication networks face issues with voice call drops and poor quality due to poor radio conditions and high interference, as UEs often fail to receive handover commands, leading to extended delays and increased power consumption.
Innovation Solution
Implementing event-triggered timers at the UE to declare Radio Link Failure (RLF) when certain radio conditions are met, allowing for quicker RRC reestablishment to a neighbor cell with better conditions, rather than waiting for RTP timeouts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for RTP timeout to declare radio link failure, then the network can maintain connection stability, but the voice call quality deteriorates and power consumption increases due to extended delays in marginal radio conditions
Solution Approach 1:
The UE performs preliminary actions by initiating timers (T310, T311) when radio conditions deteriorate below thresholds, allowing proactive detection and response to link failures before RTP timeout occurs. This enables the UE to declare RLF earlier and initiate RRC reestablishment procedures in advance, reducing delays while maintaining connection stability through controlled timeout mechanisms.
2Device complexity
If the UE uses standard RTP timeout for declaring radio link failure, then the system maintains simplicity in timeout management, but voice call performance deteriorates in marginal radio conditions due to extended delays
Solution Approach 1:
The timeout management is segmented into multiple independent timers with specific functions: T310 timer for detecting downlink failures, T311 timer for RLF declaration, and T301 timer for RRC reestablishment. This segmentation allows each timer to be optimized for its specific purpose, enabling faster voice call recovery in marginal conditions while maintaining manageable system complexity through standardized timer mechanisms.
3Reliability
If the UE declares radio link failure earlier in marginal radio conditions, then voice call quality improves, but the risk of false RLF declarations increases
Solution Approach 1:
The system uses feedback mechanisms where the UE continuously monitors downlink signal quality (RSRP, SINR) and compares it against configured thresholds. When thresholds are breached, timers T310 and T311 are initiated with configurable durations that provide feedback-based validation. This ensures RLF is only declared after sustained poor conditions, reducing false declarations while improving voice call quality through timely detection of genuine failures.
Data Source
AI summary
The present disclosure generally relates to improving the performance of voice calls in scenarios with poor radio conditions or high interference. During an active voice call, a user equipment (UE) may start a first timer after determining, from one or more measurements of a first cell, that at least one radio channel condition of the first cell is below a threshold. The UE may initiate a second timer after transmitting a measurement report that indicates the one or more measurements of the first cell. If the first timer or the second timer expires, the UE may declare radio link failure (RLF) and initiate a connection reestablishment procedure.