Beam Failure Recovery PUCCH Resource Determination
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Solution Overview
Problem
In wireless communication systems, particularly in next-generation mobile communication systems, there is a challenge in performing TRP-specific beam failure recovery, where ambiguity arises in determining the appropriate PUCCH resource for beam failure recovery due to differing beam failure conditions across cells, leading to potential failures in transmitting important control information.
Innovation Solution
A method for performing beam failure recovery in wireless communication systems involves receiving configuration information, detecting beam failure based on downlink reference signals, and transmitting a request message using a specific PUCCH resource determined by preconfigured criteria, such as association with a DL RS set, control resource set pool index, or bandwidth part, to ensure accurate TRP-specific recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TRP-specific beam failure recovery is implemented with multiple PUCCH resources, then beam failure recovery reliability is improved, but device complexity increases due to multiple PUCCH resource configurations
Solution Approach 1:
The patent segments the beam failure recovery process by associating different PUCCH resources with different TRPs (Transmission Reception Points). Each TRP has its own dedicated PUCCH resource, allowing the UE to selectively report beam failure status for specific TRPs rather than treating all TRPs uniformly. This segmentation enables precise tracking of beam failure conditions per TRP while maintaining organized resource management.
Solution Approach 2:
The patent applies local quality by configuring PUCCH resources with specific local characteristics associated with each TRP. Each PUCCH resource is locally optimized for its corresponding TRP's beam failure recovery needs, allowing differentiated handling of beam failure scenarios across different TRPs based on their specific conditions and requirements.
2Measurement precision
If beam failure detection is performed per cell with multiple DL RS sets, then measurement precision is improved, but ambiguity in PUCCH resource determination increases
Solution Approach 1:
The patent introduces an intermediary association relationship between DL RS sets and PUCCH resources. This intermediary mapping resolves the ambiguity by providing a clear correspondence rule: when beam failure is detected on a DL RS set, the UE determines which PUCCH resource to use based on the pre-established association between that DL RS set and specific PUCCH resources. This intermediary layer eliminates confusion in resource selection.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the association between DL RS sets and PUCCH resources before beam failure detection occurs. This advance configuration ensures that when beam failure is detected, the UE can immediately determine the appropriate PUCCH resource without ambiguity, as the mapping relationship has already been established in advance.
3Difficulty of detecting and measuring
If all CORESETs in a TRP are in beam failure, then beam failure detection sensitivity is improved, but control information transmission reliability deteriorates
Solution Approach 1:
The patent segments the control information transmission across multiple TRPs, each with independent beam failure detection and recovery mechanisms. When all CORESETs in one TRP experience beam failure, the segmentation ensures that control information can still be transmitted through other TRPs that are not affected, maintaining overall transmission reliability while enabling sensitive detection of failures in specific TRPs.
Data Source
AI summary
A method for performing a beam failure recovery procedure in a wireless communication system according to an embodiment of the present disclosure, the method performed by a user equipment (UE) includes receiving configuration information related to the BFR, receiving a downlink reference signal (DL RS) based on the configuration information, detecting a beam failure based on measurement for the DL RS, and transmitting a request message for the BFR. The request message for the BFR is transmitted based on a PUCCH resource related to a scheduling request (SR). 1) The PUCCH resource related to the SR is one of a plurality of PUCCH resources configured for the beam failure recovery, and 2) the beam failure is based on being related to one or more cells: the PUCCH resource related to the SR is a specific PUCCH resource determined based on a preconfigured criterion among the plurality of PUCCH resources.