PSFCH Allocation for Unicast and Multicast HARQ Feedback
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Solution Overview
Problem
Conventional resource allocation methods for hybrid automatic repeat request (HARQ) feedback in vehicle-to-everything (V2X) scenarios result in low resource utilization due to inefficient allocation of physical sidelink feedback channels (PSFCH) for unicast and multicast communications.
Innovation Solution
A method to determine PSFCH resources based on a first parameter related to the cast type and HARQ feedback manner, allocating different sizes for unicast and multicast to improve resource utilization, and ensuring integer allocation of resource blocks for PSFCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a unified feedback resource allocation method is used for both unicast and multicast communications, then the system complexity is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent segments the feedback resource allocation by creating separate determination methods for unicast and multicast communications. For unicast, the PSFCH resource is determined based on the terminal's identity and the physical sidelink shared channel (PSSCH) resource. For multicast, a separate determination method is used based on group identity and PSSCH resource. This segmentation allows each communication type to have optimized resource allocation, improving overall resource utilization while maintaining manageable system complexity through standardized procedures for each segment.
2Productivity
If separate feedback resource allocation methods are used for unicast and multicast communications, then resource utilization efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements universality by creating a multi-functional feedback resource determination mechanism. The same PSFCH resource determination framework is applied to both unicast and multicast communications, with the specific resource indices derived differently based on communication type. This universal framework reduces system complexity by reusing the same overall structure and procedures, while still allowing optimized resource allocation for each communication type through parameter differentiation.
3Manufacturing precision
If feedback resources are allocated based on terminal identity and PSSCH resource, then resource allocation precision is improved, but resource waste increases due to insufficient adaptation to different cast types
Solution Approach 1:
The patent applies local quality by adapting the feedback resource allocation strategy to the specific characteristics of each communication type. For unicast, resources are allocated based on individual terminal identity, providing precise one-to-one mapping. For multicast, resources are allocated based on group identity, providing efficient one-to-many mapping. This localized optimization ensures that each communication type receives appropriately sized feedback resources, eliminating waste from over-allocation while maintaining precision where needed.
Data Source
AI summary
A feedback resource determining method and apparatus is applied to systems such as an internet of vehicles, V2X, and V2V. The method includes obtaining a first parameter, where the first parameter is related to a cast type and a hybrid automatic repeat request HARQ feedback manner, the cast type includes unicast and multicast, and the HARQ feedback manner corresponds to the cast type; and determining a physical sidelink feedback channel PSFCH based on the first parameter. According to the feedback resource determining method and apparatus provided, PSFCHs of different sizes are allocated for different cast types and HARQ feedback manners. This improves resource utilization.