Beam Failure Recovery SR Prioritization for Overlapping Requests
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Solution Overview
Problem
In wireless communication systems like 5G NR, beam failure events can lead to inefficient recovery mechanisms, particularly for secondary cells, resulting in increased latency and signaling overhead due to overlapping and prioritization issues with scheduling request resources.
Innovation Solution
A method and apparatus for prioritizing beam failure recovery (BFR) scheduling request (SR) resources by configuring separate SR indices for BFR and Buffer Status Report (BSR) procedures, ensuring that BFR SR resources are prioritized over other SR resources when they overlap in the time domain, thereby ensuring timely beam recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate SR indices are configured for BFR and BSR procedures, then BFR SR resource prioritization is achieved, but device complexity increases
Solution Approach 1:
The patent segments the SR resource configuration into separate indices: firstSR-Index for BFR procedures and secondSR-Index for BSR procedures. This segmentation allows the UE to distinguish and prioritize BFR SR resources over BSR SR resources when they overlap in time, thereby improving beam failure recovery reliability while managing device complexity through structured resource differentiation.
2Loss of time
If BFR SR resources are prioritized over BSR SR resources, then beam failure recovery latency is reduced, but scheduling complexity increases
Solution Approach 1:
The patent establishes preliminary prioritization rules where BFR SR resources are pre-configured with higher priority than BSR SR resources. When a collision between BFR and BSR SR opportunities is detected, the UE automatically transmits on the BFR resource without complex real-time scheduling decisions. This preliminary action approach reduces beam failure recovery latency while minimizing scheduling complexity through predetermined priority rules.
3Ease of operation
If overlapping SR resources are handled with prioritization rules, then resource conflict resolution is improved, but signaling overhead increases
Solution Approach 1:
The patent resolves SR resource conflicts by changing the priority parameter associated with different SR indices. The network configures firstSR-Index with higher priority than secondSR-Index, and the UE applies this parameter differentiation to automatically resolve overlaps. This parameter-based approach simplifies resource conflict resolution while minimizing signaling overhead compared to dynamic grant-based solutions.
Data Source
AI summary
A method for Scheduling Request (SR) resource prioritization for Beam Failure Recovery (BFR) includes a User Equipment (UE) receiving a first SR configuration from a Base Station (BS), receiving a second SR configuration from the BS, triggering a first SR procedure for a BFR procedure based on the first SR configuration, triggering a second SR procedure for a Buffer Status Report (BSR) procedure based on the second SR configuration, in a case that the first SR procedure and the second SR procedure are triggered and not cancelled and the first SR resource overlaps the second SR resource in the time domain, prioritizing the first SR resource over the second SR resource, and transmitting an SR on the first SR resource after prioritizing the first SR resource over the second SR resource.