Link Failure Recovery Using Primary Cell Uplink Resources
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Solution Overview
Problem
Current link failure recovery methods in communications systems require high resource overheads as they need to configure one uplink resource set for each cell, leading to inefficient use of resources due to the one-to-one correspondence between PRACH resources and downlink reference signals.
Innovation Solution
The proposed method reduces resource overheads by allowing the terminal device to send link failure recovery requests using uplink resources associated with a primary cell, which can assist secondary cells in recovering links, thereby eliminating the need for individual uplink resources for each downlink reference signal in the candidate reference signal resource set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one uplink resource set is configured for each cell with one-to-one correspondence between PRACH resources and downlink reference signals, then link failure recovery can be supported for each cell, but resource overheads become relatively high
Solution Approach 1:
The patent applies universality by enabling the primary cell's uplink resource to serve multiple secondary cells for link failure recovery. Instead of dedicating separate uplink resources to each secondary cell, the primary cell's uplink resource is configured to assist multiple secondary cells, thereby reducing the total number of uplink resources needed while maintaining recovery capability across all cells.
Solution Approach 2:
The patent merges the uplink resource functions by combining multiple secondary cells' link failure recovery needs into a single primary cell's uplink resource. This consolidation approach allows multiple cells to share the same uplink resource for recovery purposes, directly reducing resource overheads while preserving individual cell recovery functionality.
2Measurement precision
If individual uplink resources are configured for each downlink reference signal in the candidate reference signal resource set, then precise link failure recovery can be achieved, but resource allocation efficiency decreases
Solution Approach 1:
The patent makes the primary cell's uplink resource universal by allowing it to serve multiple secondary cells simultaneously. This multi-functional approach maintains the precision needed for link failure recovery while significantly improving resource allocation efficiency by eliminating redundant resource configurations.
Solution Approach 2:
The patent extracts the essential link failure recovery function from individual cell-specific uplink resources and consolidates it into the primary cell's uplink resource. This extraction allows the system to maintain recovery precision while removing unnecessary resource duplication, thereby improving overall efficiency.
Data Source
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AI summary
Embodiments of this application provide a link failure recovery method and a related device. In the link failure recovery method, a terminal device may send first indication information on a first uplink resource based on information about a spatial relation parameter, to indicate that a link failure occurs in a ith cell in N second cells. Correspondingly, a network device may receive the first indication information on the first uplink resource based on the information about the spatial relation parameter, and send link failure recovery response information based on the first indication information, to recover a failed link. The information about the spatial relation parameter is information about a spatial relation parameter used to send a channel and/or a signal of a first cell, and the first uplink resource is an uplink resource of the first cell. Therefore, the network device does not need to configure a plurality of uplink resources that are associated with a plurality of reference signal resources of a second cell and that are used to indicate that a link failure occurs in the second cell, thereby reducing resource overheads.