Multi-Carrier Radio Link Failure Detection and Recovery
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Solution Overview
Problem
Conventional radio link failure detection and recovery procedures are inefficient for terminals supporting multiple aggregated carriers, as they were designed for single carrier scenarios, leading to unnecessary resource allocation and power waste in mobile communication systems.
Innovation Solution
A method and apparatus for configuring a radio link in a terminal using a primary and secondary cell, where radio link failures are detected and reported, and the secondary cell is deactivated if not recovered within a timer, allowing for efficient power management and reduced delay in re-establishing connections by prioritizing measurement on secondary carriers when primary carrier failures are likely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional radio link failure detection and recovery procedures are used for single carrier terminals, then the procedures are simple and well-defined, but they cannot be applied to multi-carrier terminals without modification
Solution Approach 1:
The patent segments the failure detection and recovery procedure into separate handling for primary cell and secondary cell. When a secondary cell fails, the terminal deactivates only that secondary cell and reports the failure, rather than executing a full recovery procedure. This segmentation allows the system to handle multi-carrier scenarios efficiently while maintaining simplicity.
Solution Approach 2:
The patent introduces dynamic behavior where the terminal adapts its response based on cell type (primary vs. secondary). For secondary cells, the terminal dynamically deactivates the failed cell and reports measurements to the network, allowing the system to flexibly handle different failure scenarios without requiring complex predefined procedures for each case.
2Reliability
If the terminal performs full measurement and cell reselection procedures upon detecting radio link failure on any carrier, then connection recovery is achieved, but power consumption increases and re-establishment delay increases
Solution Approach 1:
The patent segments the recovery action based on the failed cell type. For secondary cell failures, only the failed secondary cell is deactivated and measurements are reported, avoiding full reselection procedures. This selective approach maintains connection reliability while significantly reducing power consumption compared to executing complete measurement and reselection procedures for every failure.
Solution Approach 2:
The patent applies partial action by performing only the necessary minimum steps (deactivation and measurement reporting) for secondary cell failures, rather than executing the complete recovery procedure. This partial approach is sufficient to maintain reliability while avoiding excessive power consumption associated with full measurement and cell reselection.
3Loss of energy
If the terminal deactivates secondary cell upon radio link failure detection, then power waste is reduced, but the number of active carriers decreases
Solution Approach 1:
The patent segments the carrier aggregation configuration by deactivating only the failed secondary cell while keeping other carriers (primary cell and other secondary cells) active. This selective deactivation reduces power waste from the failed cell while maintaining data transmission capacity through remaining active carriers, resolving the contradiction between energy loss and productivity.
4Reliability
If the terminal reports measurement results of secondary cell and neighboring cells to base station, then the base station can make informed decisions, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by reporting only the necessary measurement results (secondary cell and neighboring cell measurements) to the base station, rather than reporting all possible measurements. This provides the base station with sufficient information for informed decisions while minimizing signaling overhead to the essential minimum required for effective network control.
Data Source
AI summary
A method and apparatus for configuring a radio link of a terminal communicating via aggregated carriers including a primary cell and a secondary cell are provided. The method includes detecting a Radio Link Failure (RLF) for the secondary cell, deactivating the secondary cell, and reporting at least one of a measurement result of the secondary cell and a measurement result of neighboring cell of the secondary cell to a base station. The apparatus includes a transceiver for communicating with a base station, and a controller configured to detect a RLF for the secondary cell, to deactivate the secondary cell, and to report at least one of a measurement result of the secondary cell and a measurement result of neighboring cell of the secondary cell to the base station.