Sidelink PSFCH Resource Mapping for Flexible HARQ Feedback
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Solution Overview
Problem
Existing methods for determining feedback resources in sidelink shared channels for HARQ-enabled unicast and groupcast transmissions in wireless communication systems are inefficient, leading to poor utilization of resources and potential waste due to varying user equipment capabilities and requirements.
Innovation Solution
A scheme for determining sidelink feedback resources on a per sub-channel basis, using a combination of time-frequency orthogonal and code division multiplexing, allowing flexible configuration based on user equipment capabilities and application requirements, and employing a scheme that prioritizes time-frequency orthogonal resources over CDM resources to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If feedback resources are determined using existing methods for sidelink shared channels, then HARQ-enabled unicast and groupcast transmissions can be supported, but resource utilization is inefficient and waste occurs due to varying user equipment capabilities and requirements
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting feedback resource allocation based on varying user equipment capabilities and application requirements. The system modifies resource allocation parameters such as feedback resource indicators (FRI) and time-frequency resources according to channel conditions, UE capabilities, and traffic patterns, thereby improving adaptability while optimizing resource utilization efficiency and reducing waste
2Device complexity
If time gap between PSSCH and PSFCH is pre-configured without dynamic signaling, then configuration complexity is reduced, but resource utilization flexibility is limited
Solution Approach 1:
The patent implements dynamics by enabling flexible and dynamic feedback resource allocation through signaling mechanisms. The time gap between PSSCH and PSFCH can be dynamically adjusted based on current system conditions, UE capabilities, and application requirements, allowing the system to adapt to varying demands while maintaining manageable configuration complexity through structured signaling approaches
3Duration of action of stationary object
If CDM is used for PSFCH resource periodicity with N>1, then feedback resource periodicity is increased, but resource utilization efficiency decreases due to potential resource waste
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting CDM parameters and feedback resource periodicity based on actual system conditions. The system can modify the periodicity parameter N and CDM configuration according to traffic patterns and UE capabilities, thereby maintaining appropriate feedback periodicity while optimizing resource utilization efficiency and minimizing waste through adaptive parameter adjustment
Data Source
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AI summary
There is provided a method of determining PSSCH feedback resources performed at a UE, wherein the PSSCH feedback (PSFCH) resource has a periodicity N defined as a number of slots.The method comprises counting a number of sub-channels, C, of PSSCH in the period N, wherein each sub-channel, c, is associated with a PSFCH resource; counting a number of PSFCH resources, R, in the period N; indexing the sub-channels, c, based on time; and after indexing the sub-channels, c, based on time, indexing the sub-channels, c, based on frequency.