Dynamic MAC CE Format Selection for Beam Failure Recovery
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Solution Overview
Problem
Current wireless communication systems face challenges in determining the appropriate format for Media Access Control (MAC) Control Elements (CE) used in Beam Failure Recovery (BFR) mechanisms, particularly in scenarios with multiple Transmitter and Receiver Points (TRPs), where existing methods do not efficiently manage beam failure detection and recovery across multiple TRPs.
Innovation Solution
A method is introduced where a node receives signaling indicating a resource set with RS resource groups and subgroups, assessing radio link quality and incrementing counters for BFR detection. Based on these counters, it determines whether to trigger BFR and selects a MAC CE format from a candidate set that maximizes BFR information transmission within the resources granted by an uplink grant, prioritizing RS resource subgroups with worse link quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple MAC CE formats are used to indicate beam failure information for different numbers of RS resource subgroups, then the completeness of BFR information transmission is improved, but the device complexity and format selection difficulty increase
Solution Approach 1:
The patent implements dynamic MAC CE format selection based on the actual number of RS resource subgroups experiencing beam failure. The system adapts the MAC CE format (first format for 1-2 subgroups, second format for 3-4 subgroups) according to the detected failure condition, rather than using a fixed format. This dynamic adaptation resolves the contradiction by optimizing information completeness while managing complexity through context-dependent format selection.
Solution Approach 2:
The patent changes the structure parameters of MAC CE formats based on the number of beam failure instances. When 1-2 RS resource subgroups fail, a compact first format is used; when 3-4 subgroups fail, an expanded second format is used. This parameter-based format selection ensures appropriate information representation for different failure scenarios while avoiding unnecessary complexity in each individual case.
2Device complexity
If a fixed MAC CE format is used for BFR, then the device complexity is reduced, but the ability to efficiently transmit BFR information for varying numbers of failed RS resource subgroups deteriorates
Solution Approach 1:
The system transitions from static to dynamic MAC CE format selection. The format is determined dynamically based on the number of RS resource subgroups with beam failure, allowing the system to optimize transmission efficiency for each specific scenario while maintaining manageable complexity through clear format selection criteria.
Solution Approach 2:
The patent segments the BFR information transmission into two distinct format categories based on the number of failed subgroups. This segmentation allows each format to be optimized for its specific use case (first format for 1-2 subgroups, second format for 3-4 subgroups), improving overall transmission efficiency while keeping each segment's complexity manageable.
3Reliability
If beam failure detection is performed for multiple TRPs independently, then the reliability of beam failure recovery is improved, but the complexity of BFR mechanism management increases
Solution Approach 1:
The patent segments the beam failure detection and recovery process by TRP, with each TRP independently monitoring its own beam conditions through separate RS resource groups and subgroups. This segmentation improves reliability by ensuring that failures in one TRP do not necessarily indicate failures in others, while the standardized MAC CE reporting mechanism keeps the overall management complexity manageable.
Solution Approach 2:
The patent implements a universal MAC CE reporting mechanism that handles beam failure information from multiple TRPs through a unified format structure. The same MAC CE format and transmission procedure serve multiple TRPs, providing multi-functionality that improves reliability through independent TRP monitoring while avoiding the complexity of entirely separate recovery mechanisms for each TRP.
Data Source
AI summary
Present application provides a method and a device in a communication node for wireless communications. A communication node receives a first signaling, the first signaling indicates a first RS resource set which comprises at least one RS resource group, and each RS resource group comprises at least one RS resource subgroup; determines whether to trigger a BFR based on whether a first-type counter reaches a first-type value; receives a second signaling which indicates a first uplink grant; determines a format of a target MAC CE based on a number of RS resource subgroup(s) indicated by each of at least one candidate format in a first candidate format set, and an RS resource subgroup indicated by any candidate format belongs to the first RS resource set; transmits the target MAC CE according to the first uplink grant; each candidate format is a format of a MAC CE indicating BFR.