MAC CE Structure for Multi-TRP Beam Failure Recovery Reporting
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently performing beam failure recovery reporting in multi-beam and multi-TRP scenarios, leading to increased latency and signaling overhead.
Innovation Solution
A method for beam failure recovery reporting by user equipment (UE) involving the generation and transmission of a Medium Access Control (MAC) control element (CE) with specific fields (SP, Ci, TCi, TRP, AC, and Candidate RS ID) to report both cell and TRP beam failure information, optimizing the format for multi-TRP configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate beam failure detection is performed for each TRP in multi-TRP scenarios, then beam failure recovery accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent combines beam failure detection for multiple TRPs into a unified MAC CE reporting mechanism. Instead of separate reporting procedures for each TRP, the invention merges them into a single MAC CE structure that can simultaneously report beam failure status, candidate beam information, and TRP identification for multiple TRPs, thereby reducing signaling overhead while maintaining detection accuracy.
Solution Approach 2:
The MAC CE format designed in the patent serves multiple functions simultaneously: it identifies which TRP experienced beam failure, reports the failure status, provides candidate beam information, and indicates whether the candidate beam is shared or dedicated. This multi-functional design reduces the need for separate signaling messages for each aspect of beam failure recovery.
2Measurement precision
If detailed beam failure information is reported for each TRP, then recovery accuracy is improved, but latency increases
Solution Approach 1:
The patent merges multiple pieces of beam failure information (TRP ID, failure status, candidate beam ID, beam sharing status) into a single MAC CE message. This consolidation allows the UE to report all necessary information in one transmission rather than multiple sequential reports, reducing the total time required for beam failure recovery while maintaining comprehensive information for accurate recovery.
3Device complexity
If a unified beam is used for multi-BWP/CC transmission, then device complexity is reduced, but beam failure detection capability deteriorates
Solution Approach 1:
The patent introduces a reference BWP/CC as an intermediary for beam failure detection. The reference BWP/CC serves as a representative for the entire multi-BWP/CC group, allowing the network to configure beam failure detection parameters once for the reference entity rather than for each BWP/CC individually. This reduces configuration complexity while maintaining the ability to detect beam failures across all BWPs/CCs in the group.
Data Source
AI summary
Provided in the present invention are a method performed by user equipment and user equipment. The method includes: generating a Medium Access Control control element (MAC CE) for reporting beam failure information; and transmitting the generated MAC CE to a base station, wherein a format of the MAC CE for reporting both the beam failure information of a cell and the beam failure information of a transmit/receive point (TRP) is designed, and SP, Ci, TCi, TRP, AC, Candidate RSID, and R fields are present in the format of the MAC CE.