PSSCH Resource Timing for HARQ Feedback in Unlicensed Sidelink
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Solution Overview
Problem
In wireless communication systems, there is a lack of a solution for determining the appropriate physical sidelink shared channel (PSSCH) resources in an unlicensed frequency band that ensure a minimum time gap for HARQ feedback, particularly in scenarios where multiple PSFCH occasions are mapped to a PSSCH, which is crucial for reliable TB transmission.
Innovation Solution
A method and apparatus for determining a PSSCH resource by identifying a target PSFCH occasion from multiple mapped PSFCH occasions and ensuring a minimum time gap between any two selected PSSCH resources, using unlicensed frequency band resources to support HARQ feedback, where M is an integer greater than 1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PSFCH occasions are mapped to a PSSCH, then the HARQ feedback capability is improved, but the resource selection complexity increases
Solution Approach 1:
The PSSCH resource selection process is segmented into distinct steps: first determining the target PSFCH occasion from multiple mapped occasions, then calculating the minimum time gap based on that target occasion. This segmentation transforms a complex multi-parameter selection problem into a structured two-step process, reducing resource selection complexity while maintaining HARQ feedback reliability.
2Reliability
If a minimum time gap is enforced between PSSCH resources, then the HARQ feedback reliability is improved, but the resource utilization efficiency decreases
Solution Approach 1:
The minimum time gap is not fixed but dynamically determined based on the target PSFCH occasion. By changing the parameter calculation method from a static value to a dynamic value derived from the target PSFCH occasion, the system ensures adequate time for HARQ feedback processing while optimizing resource utilization efficiency through adaptive gap adjustment.
3Adaptability or versatility
If the target PSFCH occasion is determined from multiple mapped occasions, then the HARQ feedback flexibility is improved, but the determination complexity increases
Solution Approach 1:
The target PSFCH occasion is determined in advance before the actual PSSCH resource selection. This preliminary determination simplifies subsequent resource selection by providing a fixed reference point for calculating the minimum time gap, thereby reducing overall determination complexity while maintaining HARQ feedback flexibility.
Data Source
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AI summary
Embodiments of the present disclosure provide a method and apparatus for determining a physical sidelink shared channel (PSSCH) resource, a communication device, and a storage medium. The method comprises: determining a target physical shared feedback channel (PSFCH) occasion among M PSFCH occasions mapped by a PSSCH where a transport block (TB) is located; and on the basis of the target PSFCH occasion, determining a minimum time interval for any two PSSCH resources selected for the TB, wherein a time interval between any two PSSCH resources selected for one TB is not less than the minimum time interval, the PSSCH resources are unlicensed frequency band resources and are used for transmission and retransmission of the TB, a first PSSCH of any two PSSCHs supports HARQ feedback, and M is an integer greater than 1. In this way, when TB transmission is carried out on the basis of the unlicensed frequency band PSSCH resource, it can be ensured that the minimum time interval is met between any two PSSCH resources selected for the TB, thereby ensuring that the TB supports retransmission based on the HARQ feedback.