Link Failure Recovery via Pre-configured Reference Signal Resource Sets
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Solution Overview
Problem
Existing link failure recovery methods in communication systems face challenges in increasing recovery probability, reducing recovery delay, and improving reliability when terminal devices cannot determine new links or find available beams.
Innovation Solution
A method and apparatus that involve determining the state of link failures in cells, sending request messages to indicate cell information, and receiving response messages to identify reference signal resource sets for recovering link failures, allowing the network device to reconfigure resources and notify the terminal device of new reference signals for link recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device sends a beam failure recovery request message to notify the network device of link failure, then the network device can be notified of the link failure and new link information can be reported, but if the terminal device cannot determine a new link or find an available beam, link failure recovery fails and communication efficiency is reduced
Solution Approach 1:
The network device pre-configures multiple reference signal resource sets for different scenarios before link failure occurs. When link failure happens, the terminal device can immediately use the pre-configured appropriate resource set without needing to search or determine new resources, enabling faster and more reliable recovery even when no new link is available.
Solution Approach 2:
The patent changes the parameter of reference signal resource configuration by introducing multiple resource sets with different characteristics (e.g., different QCL assumptions, different beam directions). This allows the system to adapt to different failure scenarios by selecting appropriate resource sets, improving both recovery reliability and efficiency.
2Reliability
If the terminal device searches for available beams to establish new link connection, then link recovery can be achieved, but the search process increases recovery delay
Solution Approach 1:
The network device pre-configures multiple reference signal resource sets containing multiple reference signals with different spatial parameters before link failure occurs. When link failure happens, the terminal device can immediately use the pre-configured appropriate resource set without needing to search or determine new resources, enabling faster and more reliable recovery even when no new link is available.
Solution Approach 2:
The patent ensures continuous availability of reference signal resources by maintaining multiple pre-configured resource sets. This eliminates interruptions caused by resource search or determination during failure recovery, reducing recovery delay while maintaining high recovery probability through continuous access to appropriate resources.
Data Source
AI summary
This application provides a link failure recovery method and apparatus. When a link failure occurs and link recovery is performed, if a terminal device determines that no new link is identified, according to the method, the terminal device may report, to a network device, an identifier of a cell in which the link failure occurs and information indicating whether a new link is identified for each cell. The network device may reconfigure a new resource set based on the information, and notify the terminal device of the new resource set by using downlink control information DCI. In other words, a reference signal in another resource set is triggered by using the DCI, and the reference signal in the resource set is reported for link recovery.