Sidelink Feedback Resource Allocation Under OCB and PSD Limits
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Solution Overview
Problem
Existing New Radio Release-16/Release-17 (NR Rel-16/Rel-17) SL PSFCH formats fail to meet Occupied Channel Bandwidth (OCB) requirements during sidelink feedback channel transmission on unlicensed spectrum, leading to limitations in transmission power and performance.
Innovation Solution
A method for determining feedback resources that ensures sidelink devices meet OCB requirements by allocating dedicated and shared PRBs, with specific rules for grouping and puncturing shared PRBs to maintain transmission power within PSD limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional NR Rel-16/Rel-17 SL PSFCH format is used for feedback transmission, then the transmission format is simple and standardized, but the Occupied Channel Bandwidth (OCB) requirements cannot be met
Solution Approach 1:
The feedback channel resources are segmented into dedicated PRBs and shared PRBs. Dedicated PRBs are allocated specifically for PSFCH transmission to ensure OCB requirements are met, while shared PRBs are used for other purposes. This segmentation allows the system to satisfy regulatory bandwidth requirements without overly complicating the overall resource allocation structure.
Solution Approach 2:
Different quality levels are applied to different frequency resources. Dedicated PRBs are assigned with guaranteed quality for feedback transmission to ensure OCB compliance, while shared PRBs have flexible quality characteristics. This local differentiation enables the system to meet minimum bandwidth requirements in specific frequency regions without uniformly increasing complexity across all resources.
2Reliability
If more PRBs are allocated for PSFCH transmission to meet OCB requirements, then the occupied channel bandwidth increases, but the transmission power must be reduced to stay within PSD limits
Solution Approach 1:
PRBs are segmented into dedicated and shared categories, allowing the system to concentrate power on dedicated PRBs for PSFCH transmission while using shared PRBs for other purposes. This segmentation enables meeting OCB requirements through bandwidth aggregation rather than uniformly increasing power across all PRBs, thus staying within PSD limits.
Solution Approach 2:
The solution transitions from a single-dimension approach (increasing power on fewer PRBs) to a multi-dimensional approach (using both frequency dimension with multiple PRBs and power dimension with controlled allocation). By spreading feedback transmission across multiple dedicated PRBs in the frequency domain while controlling power per PRB, the system meets OCB requirements without exceeding PSD constraints.
3Reliability
If shared PRBs are used for PSFCH transmission to increase bandwidth, then the occupied channel bandwidth increases, but resource interference with other channels increases
Solution Approach 1:
The solution segments PRBs into dedicated and shared sets, where dedicated PRBs are exclusively allocated for PSFCH transmission. This segmentation eliminates resource interference by ensuring that feedback transmission occurs on dedicated resources without competing with other channels, while shared PRBs remain available for other purposes without being contested by PSFCH.
Solution Approach 2:
Dedicated PRBs are extracted from the shared resource pool and allocated specifically for PSFCH transmission. This extraction removes the source of potential interference by separating feedback channel resources from general shared resources, ensuring that PSFCH transmission does not interfere with other channels while still achieving the required occupied bandwidth.
Data Source
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AI summary
Provided are a feedback resource determination method, a communication node, and a storage medium. The feedback resource determination method includes the following: In each resource block set included in a data resource pool, a first feedback resource set corresponding to each subband is determined, where the first feedback resource set includes at least one feedback resource, the at least one feedback resource includes K dedicated PRBs, and K is a positive integer; based on subband information and resource block set information of received data, a second feedback resource set is determined, where the second feedback resource set includes at least one first feedback resource set; and a feedback resource is determined in the second feedback resource set, and physical sidelink feedback information is transmitted through N shared PRBs and the feedback resource, where N is a positive integer.