Radio Link Failure Handling via Configurable Timer Values
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE, radio link failures during RRC connected mode can lead to delayed recovery, compromising user service quality due to the lack of effective handling mechanisms.
Innovation Solution
A method and apparatus for handling radio link failures by setting up radio bearers between user equipment and a base station, selecting a timer value for a radio link failure timer, attempting RRC connection re-establishment, and transitioning to RRC idle state when the timer expires, with options for selecting timer values based on priority, logical channel priority, or bit rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE attempts RRC connection re-establishment after detecting radio link failure, then the recovery time is extended, but the service quality deteriorates due to delayed recovery
Solution Approach 1:
The patent applies dynamics by making the timer value configurable and adjustable based on radio bearer priority. Different radio bearers (e.g., dedicated bearer vs. default bearer) can have different timer values assigned, allowing the system to dynamically adapt the recovery timing strategy to the specific service requirements and priority levels of different data flows
Solution Approach 2:
The patent changes the parameter of timer value from a fixed value to a configurable parameter that can be selectively applied based on radio bearer identification and priority. The network can configure multiple timer values corresponding to different radio bearers, and the UE selects the appropriate timer value based on the identified radio bearer, thereby optimizing the balance between recovery reliability and time loss
2Device complexity
If a single timer value is used for all radio bearers, then the system complexity is reduced, but the service quality for different priority bearers cannot be differentiated
Solution Approach 1:
The patent applies local quality by assigning different timer values to different radio bearers based on their specific priority and service requirements. Instead of using a uniform timer value across all bearers, the system configures and applies timer values locally to each radio bearer according to its importance, ensuring that high-priority services receive appropriate attention while maintaining manageable system complexity
Solution Approach 2:
The patent segments the timer management function by creating separate timer value configurations for different radio bearers. Each radio bearer can have its own configured timer value, allowing independent optimization of recovery timing for different services while maintaining a unified overall framework that prevents excessive complexity
Data Source
AI summary
A method and apparatus of handling a radio link failure in a wireless communication system is provided. Upon detecting a radio link failure in a Radio Resource Control (RRC) connected state, a user equipment starts a radio link failure timer of which timer value is selected among at least one timer value for at least one RB. The user equipment attempts a RRC connection re-establishment while the radio link failure timer is running, and transitions to a RRC idle state when the radio link failure timer is expired.