Physical Sidelink Feedback Channel Resource Allocation in Multicast Groups
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Solution Overview
Problem
Existing solutions for allocating physical sidelink feedback channel resources in a multicast group do not provide detailed allocation methods, leading to inefficiencies and potential errors in resource allocation.
Innovation Solution
A method for determining physical sidelink feedback channel resources involves a first terminal device sending multicast information to second terminal devices and determining the resources based on the total number of terminal devices in the multicast group and the resource group of physical sidelink feedback channel resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PSFCH resources are allocated to each UE in a multicast group without detailed allocation rules, then resource allocation flexibility is improved, but resource allocation reliability deteriorates due to lack of systematic allocation
Solution Approach 1:
The patent applies parameter changes by utilizing UE-specific parameters (such as UE ID or C-RNTI) and resource group parameters (such as PRB index and sequence index) to dynamically determine the mapping relationship between UEs and PSFCH resources. This ensures that each UE can independently and reliably determine its allocated resources based on predefined rules, resolving the contradiction between flexibility and reliability.
2Productivity
If PSFCH resources are allocated to support multicast feedback, then feedback capability is improved, but false detection probability increases due to resource conflicts or insufficient resource differentiation
Solution Approach 1:
The patent applies local quality by allocating specific PSFCH resources (distinct PRBs and sequences) to different UEs within the multicast group based on their individual parameters. This ensures that each UE's feedback transmission has unique local characteristics, preventing resource conflicts and reducing false detection probability while maintaining high feedback capability.
3Measurement precision
If detailed PSFCH resource allocation rules are implemented, then resource allocation precision is improved, but system complexity increases due to additional determination steps
Solution Approach 1:
The patent applies self-service by enabling each UE to autonomously determine its own PSFCH resource allocation based on predefined rules and its own parameters (such as UE ID). The transmitting UE similarly determines resource mappings independently. This self-determining mechanism achieves precise resource allocation without requiring complex centralized control or additional signaling, thus reducing system complexity while maintaining high allocation precision.
Data Source
AI summary
A method for determining a physical sidelink feedback channel resource and an apparatus are provided. The method includes: a first terminal device sends multicast information to at least two second terminal devices. The first terminal device determines, based on a total quantity of terminal devices in a multicast group and a resource group of physical sidelink feedback channel resources, a physical sidelink feedback channel resource corresponding to each second terminal device. The first terminal device receives, based on the physical sidelink feedback channel resource corresponding to each second terminal device, feedback information sent by each of the at least two second terminal devices. According to the foregoing method, physical sidelink feedback channel resources can be allocated to the terminal devices in the multicast group.