Groupcast Feedback Resource Allocation in 5G V2X
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Solution Overview
Problem
In the context of 5G V2X communication, there is a lack of an exact solution for determining the feedback resource for Receiver UEs (Rx UEs) when using groupcast mode, especially in scenarios where HARQ feedback is applied and group members use independent feedback resources.
Innovation Solution
The method involves the Transmitter UE (Tx UE) indicating the positions of available feedback resources through sidelink control information, which allows the Rx UE to determine its allocated feedback resource based on its intra-group identifier and a preset mapping relationship.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent feedback resources are allocated for each Rx UE in groupcast mode, then feedback reliability is improved, but resource allocation complexity increases and resource waste occurs when group member count is unknown
Solution Approach 1:
The feedback resource pool is segmented into multiple individual feedback resources that can be selectively allocated to different Rx UEs based on their intra-group identifiers. This segmentation allows the system to provide dedicated feedback resources (improving reliability) while only allocating resources to actual group members (reducing complexity and waste).
Solution Approach 2:
The patent changes the parameter of feedback resource allocation from a static fixed assignment to a dynamic identifier-based mapping. By using intra-group identifiers as a parameter to determine feedback resource selection, the system adapts resource allocation to the actual group composition, resolving the contradiction between providing dedicated resources and managing complexity when group size varies.
2Productivity
If feedback resources are dispersed across the entire pool, then load balance is achieved, but resource determination complexity increases
Solution Approach 1:
The patent introduces a mathematical mapping relationship between intra-group identifiers and feedback resource indices. This parameter-based mapping formula automatically disperses feedback resources across the pool based on identifier distribution, achieving load balance while keeping the determination process systematic and manageable through a clear mathematical relationship rather than complex ad-hoc allocation.
Solution Approach 2:
Each Rx UE autonomously determines its own feedback resource by applying the mapping relationship to its intra-group identifier without requiring centralized allocation or complex coordination. This self-service mechanism achieves load balance across the resource pool while simplifying the overall system complexity, as each UE independently computes its resource assignment.
Data Source
AI summary
A method and apparatus for determining a groupcast feedback resource, a storage medium and a User Equipment (UE) are provided. The method is applied at a first Receiver (Rx) UE and includes: receiving sidelink control information and transmission data from a Transmitter (Tx) UE, wherein the Tx UE transmits the sidelink control information and the transmission data using a groupcast mode; determining a position of a first available feedback resource based on a position of the transmission data scheduled by the sidelink control information and a second preset mapping relationship; and determining the feedback resource for the first Rx UE based on an intra-group identifier of the first Rx UE and the position of the first available feedback resource.