Radio Link Failure Detection in Multi-Carrier LTE Systems
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Solution Overview
Problem
The LTE Advanced wireless communication system lacks clear specifications for radio link failure detection in multiple component carriers or cells, leading to improper timer initiation and potential abnormal connection malfunctions.
Innovation Solution
A method for handling radio link failure detection in wireless communication systems that involves performing radio problem detection across multiple targets of interest and starting timers accordingly, including separate timers for individual and collective radio link failures, to reduce signaling quantity, maintain connection efficiency, and enhance flexibility in radio link failure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single timer is used for radio link failure detection in LTE system, then the system structure remains simple, but the system cannot properly handle multiple component carriers or cells in LTE-Advanced
Solution Approach 1:
The patent divides the timer management into multiple independent timers, each associated with a specific component carrier or cell. This segmentation allows each timer to independently track radio link status for its designated target, enabling proper handling of multiple component carriers while maintaining clear, manageable timer structures.
Solution Approach 2:
The patent creates a universal timer management mechanism that can handle both single-carrier and multi-carrier scenarios. The same timer management logic and procedures apply whether the UE is connected to one component carrier or multiple component carriers, providing flexibility and adaptability without requiring separate specialized mechanisms.
2Measurement precision
If separate timers are initiated for each component carrier, then radio link failure detection accuracy improves, but signaling quantity increases
Solution Approach 1:
The patent combines multiple timer management operations into unified procedures. When radio link failure is detected on any component carrier, the UE initiates a single uplink transmission containing failure information for all affected carriers, rather than sending separate signals for each carrier. This merging reduces overall signaling quantity while maintaining precise detection through individual timers.
Solution Approach 2:
The patent uses a template-based approach where the UE constructs failure information messages using standardized formats and procedures. Instead of creating entirely new signaling mechanisms for each scenario, the UE copies and adapts existing timer management and failure reporting templates, reducing signaling overhead through reuse of established patterns.
3Reliability
If timer initiation is not clearly specified for multiple component carriers, then system specification remains simple, but connection reliability deteriorates due to improper timer initiation
Solution Approach 1:
The patent establishes clear preliminary rules for timer initiation before radio link failure scenarios occur. The specification defines in advance which timers to start, when to start them, and under what conditions, eliminating ambiguity. This preliminary specification ensures reliable connection handling by providing deterministic timer management behavior in multi-carrier scenarios.
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors radio link status on each component carrier and provides feedback information to the network. Based on this feedback, the network can adjust timer parameters and provide guidance on proper timer initiation, creating a closed-loop system that improves connection reliability through adaptive timer management.
Data Source
AI summary
A method of handling radio link failure detection for a communication device of a wireless communication system includes performing radio problem detection for a plurality of targets of interest, and managing at least a timer for detecting radio link failure of the plurality of targets of interest.