Bitmap-Based LBT Failure Indication for Sidelink Resource Allocation
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Solution Overview
Problem
In sidelink unlicensed (SL-U) networks, consistent listen-before-talk (LBT) failures are not effectively reported per resource block (RB) set, leading to degraded system performance due to the lack of appropriate scheduling and resource allocation.
Innovation Solution
A UE transmits a consistent LBT failure indication using a bitmap, where each bit corresponds to an RB set, allowing for the indication of LBT failures, enabling improved scheduling and resource allocation to avoid RB sets with consistent LBT failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If LBT failures are not reported per RB set, then the signaling overhead is reduced, but system performance degrades due to lack of appropriate scheduling and resource allocation
Solution Approach 1:
The patent segments the LBT failure reporting by introducing a bitmap structure where each bit corresponds to a specific RB set. This allows per-RB-set LBT failure indication, enabling the network to identify and avoid specific failed resource blocks while maintaining scheduling efficiency on successful RB sets.
2Measurement precision
If per RB set LBT failure indication is implemented, then scheduling accuracy is improved, but signaling complexity increases
Solution Approach 1:
The patent changes the reporting parameter from a general LBT failure indicator to a bitmap-based per-RB-set indicator. This parameter transformation enables precise identification of failed RB sets while using an efficient binary encoding scheme that minimizes signaling overhead compared to alternative detailed reporting methods.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a consistent listen-before-talk (LBT) failure indication that includes a bitmap, wherein a bit in the bitmap corresponds to a resource block (RB) set, and the bit indicates whether the RB set is associated with consistent LBT failure. The UE may perform a sidelink communication based at least in part on scheduling, wherein the scheduling is based at least in part on the consistent LBT failure indication. Numerous other aspects are described.