PSFCH Resource Pool Selection for Sidelink HARQ Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively managing sidelink hybrid automatic repeat request (HARQ) feedback and resource pool selection, particularly in scenarios where user equipment (UE) autonomous resource selection is configured, leading to inefficiencies in confirming activation or deactivation of configured grants.
Innovation Solution
A method for selecting a resource pool with physical sidelink feedback channel (PSFCH) resources based on the availability of sidelink data and enabling HARQ feedback for logical channels, allowing for proper configuration of resource pools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE autonomous resource selection is configured, then resource allocation flexibility is improved, but resource pool selection for HARQ feedback becomes ambiguous and inefficient
Solution Approach 1:
The patent changes the selection parameter from general resource pool selection to specific PSFCH resource pool selection based on HARQ feedback requirements. The UE determines the resource pool by checking the availability of PSFCH resources in candidate pools, transforming the selection criterion from generic to specific and resolving the ambiguity in autonomous resource selection scenarios.
2Productivity
If multiple configured grants are configured, then transmission capacity is improved, but confirmation of activation or deactivation becomes complex and error-prone
Solution Approach 1:
The patent introduces explicit feedback mechanisms through HARQ-ACK transmissions on PSFCH resources. When multiple configured grants are active, the UE transmits HARQ-ACK feedback for each grant separately, providing clear confirmation of activation or deactivation status. This feedback loop eliminates the complexity and errors associated with managing multiple grants without explicit confirmation.
Data Source
AI summary
A method and apparatus for sidelink hybrid automatic repeat request (HARQ) feedback and resource pool selection is provided. When user equipment (UE) autonomous resource selection is configured, a wireless device selects a resource pool configured with physical sidelink feedback channel (PSFCH) resources, among one or more resource pools allowed for a logical channel, based on i) sidelink data being available in the logical channel, ii) any resource pool being not selected for the logical channel, and iii) hybrid automatic repeat request (HARQ) feedback being enabled for the logical channel.