Sidelink HARQ Feedback Allocation for Multi-Receiver Groupcast
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Solution Overview
Problem
Existing V2X communication systems face challenges in efficiently managing groupcast transmission and Hybrid Automatic Repeat Request (HARQ) feedback for multiple receiving apparatuses, particularly in scenarios like vehicle platooning and advanced driving, where reliable and low-latency communication is crucial.
Innovation Solution
A method and apparatus for groupcast communication that involves transmitting physical sidelink control and shared channels to multiple receiving apparatuses, with HARQ feedback received based on configured physical sidelink feedback channel resource block sets, allowing for different cyclic shift values, enabling effective HARQ feedback for groupcast transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If groupcast transmission is performed to multiple receiving apparatuses, then communication coverage and data delivery are improved, but HARQ feedback management complexity increases
Solution Approach 1:
The patent segments the HARQ feedback resources by dividing the feedback channel into multiple resource blocks (PRBs), where each PRB can carry feedback for a specific subset of receiving apparatuses. This segmentation allows the transmitter to manage feedback from multiple receivers in an organized manner, reducing the complexity of tracking and processing individual feedback signals.
Solution Approach 2:
The patent introduces a feedback resource allocation mechanism that acts as an intermediary between the transmitter and multiple receivers. By allocating specific PSFCH PRB sets to different receiving apparatuses, the system creates a structured intermediate layer that simplifies the feedback management process and enables scalable groupcast communication.
2Reliability
If multiple PSFCH PRB sets are configured for HARQ feedback, then feedback reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies local quality by assigning different PSFCH PRB sets to different receiving apparatuses based on their specific requirements and positions. Each receiver gets dedicated feedback resources tailored to their needs, which improves reliability while the systematic allocation pattern keeps the complexity manageable through predictability and standardization.
3Reliability
If HARQ feedback is received from multiple receiving apparatuses, then communication reliability is improved, but processing time and latency increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring the PSFCH PRB set allocations before the actual feedback transmission. The resource allocation is established in advance through system configuration, which allows the transmitter to efficiently process incoming feedback without performing complex real-time allocation decisions, thereby reducing processing latency while maintaining reliability.
Data Source
AI summary
According to one embodiment of the disclosure, provided is a method by which a first device performs groupcast communication. The method comprises the steps of transmitting a PSCCH and a PSSCH to N receiving devices, and receiving at least one HARQ feedback for the PSSCH on the basis of M PSFCH PRB sets, wherein at least one PSFCH PRB set based on CS values differing from each other is set on the M PSFCH PRB sets on the basis that N is larger than M, and N and M are positive integers.