Beam Recovery Signaling for Faster Multi-TRP Link Restoration
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Solution Overview
Problem
In a New Radio (NR) communication system, beam failure occurs when user equipment moves or the antenna direction rotates, leading to challenges in beam recovery and link maintenance, particularly with the introduction of multi-TRP PDCCH, which affects the success rate and delay of link recovery.
Innovation Solution
A link recovery method where user equipment determines a target reference signal resource subset from a candidate beam reference signal set and indicates its identification to the network side device, allowing the network side device to determine new beams for link recovery, enhancing the success rate and reducing delay in multi-TRP scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple beams are used to send the same signaling in multi-TRP scenarios, then coverage and path loss resistance are improved, but beam failure occurs when UE moves or antenna direction rotates
Solution Approach 1:
The network side device pre-configures multiple candidate beam reference signal resource subsets before beam failure occurs. When beam failure is detected, the UE can immediately select from these pre-prepared candidate beams without needing to perform extensive new beam searching, thus resolving the contradiction between maintaining reliable links and adapting to movement.
Solution Approach 2:
The system changes the beam parameters by switching from a single configured beam to multiple candidate beams when failure is detected. The UE selects a new beam from the candidate set based on current channel conditions and movement state, allowing the system to adapt to changes in UE position or antenna orientation while maintaining link reliability.
2Reliability
If beam failure recovery request is sent to network side device, then link recovery is performed, but recovery delay increases
Solution Approach 1:
The network side device pre-configures multiple candidate beam reference signal resource subsets and provides them to the UE before beam failure occurs. This preliminary preparation allows the UE to quickly select and indicate a candidate beam upon failure detection, significantly reducing the time required for beam failure recovery while maintaining reliable link restoration capability.
3Device complexity
If single beam is configured for UE, then device complexity is reduced, but link recovery success rate decreases when beam failure occurs
Solution Approach 1:
The candidate beam reference signal resources are segmented into multiple resource subsets, each representing different beam directions or characteristics. The network configures multiple such subsets, and the UE can select from them based on current conditions. This segmentation provides diverse recovery options without requiring the UE to manage all individual beam parameters, thus improving recovery success rate while controlling complexity.
Data Source
AI summary
A link recovery method includes obtaining a configuration signaling sent by a network side device; determining a target reference signal resource subset from the candidate beam reference signal set; and indicating identification information of the target reference signal resource subset to the network side device. The configuration signaling includes a candidate beam reference signal set. The candidate beam reference signal set includes at least one reference signal resource subset. The reference signal resource subset includes at least one reference signal resource.