TX UE BSR Cancellation During Beam Failure Recovery
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a need to efficiently process buffer status reporting (BSR) when beam failure recovery (BFR) is triggered, as existing methods do not effectively manage BSR in scenarios involving sidelink communication and beam failure.
Innovation Solution
A method and apparatus for a transmitting user equipment (TX UE) in a wireless communication system, where the TX UE transmits a request for a sidelink resource to a base station on a first beam and triggers initial BSR. Upon triggering beam failure recovery (BFR) related to the first beam, the TX UE cancels the initial BSR and triggers subsequent BSRs for sidelink data on a newly selected beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the TX UE triggers initial BSR before beam failure recovery, then the buffer status is reported timely, but the BSR may be transmitted on a failed beam causing communication failure
Solution Approach 1:
The patent applies preliminary action by selecting a new beam before transmitting the BSR. The UE performs beam failure detection, triggers BFR, selects a new beam, and only then transmits the BSR on the newly selected beam. This ensures the BSR is transmitted on a reliable beam while maintaining timely reporting through efficient beam selection procedures.
Solution Approach 2:
The patent implements dynamics by making the BSR transmission beam dynamic rather than static. The beam selection is adapted based on beam failure detection results, allowing the system to switch from a failed beam to a newly selected successful beam, thereby maintaining reliability while preserving timely transmission.
2Reliability
If the TX UE defers BSR during beam failure recovery, then transmission reliability is improved, but communication efficiency and resource allocation are degraded
Solution Approach 1:
The patent uses preliminary action by completing beam selection and preparation before BSR transmission. The UE proactively selects a new beam during the BFR process, so when the BSR needs to be transmitted, the reliable beam is already ready, eliminating the need for deferral and maintaining communication efficiency.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring the BSR transmission process continues without unnecessary interruption. Instead of deferring BSR transmission entirely during BFR, the system continuously progresses through beam selection and prepares for immediate BSR transmission on the new beam, maintaining productivity while ensuring reliability.
3Device complexity
If the TX UE transmits BSR on the original beam, then the transmission process is simple, but the beam may have failed causing loss of information
Solution Approach 1:
The patent applies preliminary action by performing beam failure detection and new beam selection before BSR transmission. This advance preparation ensures the selected beam is reliable, preventing information loss while adding only necessary beam management steps to the transmission process.
Solution Approach 2:
The patent introduces beam selection as an intermediary step between the original beam and BSR transmission. This intermediary process filters out failed beams and selects reliable ones, ensuring information delivery success while adding controlled complexity only where necessary for reliability.
4Productivity
If the TX UE cancels initial BSR upon triggering BFR, then resource allocation is optimized, but additional processing steps are required
Solution Approach 1:
The patent uses preliminary action by canceling the initial BSR trigger upon detecting beam failure, preventing wasted resource allocation for transmissions that would fail. The UE proactively manages the BSR trigger state during BFR, optimizing resources while the added complexity is confined to the control logic for trigger management.
Solution Approach 2:
The patent applies discarding and recovering by canceling (discarding) the initial BSR trigger when beam failure is detected, preventing resource waste. The BSR functionality is then recovered and re-triggered after successful beam selection, ensuring efficient resource use while managing processing complexity through structured trigger control.
Data Source
AI summary
An embodiment relates to a method for operating a transmitting user equipment (TX UE) in a wireless communication system, the method including: a step in which the TX UE requests a base station for a sidelink resource through a first beam; and a step in which the TX UE triggers first buffer status reporting (BSR), wherein the TX UE cancels the first BSR on the basis of a beam failure recovery (BFR) trigger pertaining to the first beam.