NR V2X Sidelink Resource Pool Mapping for HARQ Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing wireless communication systems face challenges in managing resource pools efficiently for sidelink (SL) communication in NR V2X, particularly in handling physical sidelink control and shared channels, as well as hybrid automatic repeat request (HARQ) feedbacks, which affect the reliability and latency of vehicle-to-everything (V2X) communications.
Innovation Solution
A method and device are proposed to manage resource pools by transmitting physical sidelink control and shared channels, determining PSFCH resources for HARQ feedbacks, and receiving feedbacks based on configured resource pools, enhancing the efficiency of SL communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource pools are managed using existing methods in NR V2X, then basic sidelink communication can be established, but resource utilization efficiency is insufficient and HARQ feedback reliability is degraded
Solution Approach 1:
The resource pool is segmented into multiple PSFCH resource groups, where each group corresponds to specific PSSCH resources. This segmentation allows for more granular resource management and improves HARQ feedback reliability by dedicating specific feedback resources to specific data transmissions, while also enabling more efficient overall resource utilization through structured organization.
Solution Approach 2:
PSFCH resources are pre-configured and determined before actual HARQ feedback transmission occurs. The network pre-allocates and signals PSFCH resource information to UEs based on PSSCH resource configurations, allowing UEs to immediately use the predetermined resources for feedback transmission without additional signaling delay, thereby improving both reliability and efficiency.
2Reliability
If PSFCH resources are dynamically allocated for each HARQ feedback, then feedback reliability improves, but signaling overhead and latency increase
Solution Approach 1:
PSFCH resources are pre-determined and pre-configured based on PSSCH resource allocations before actual data transmission occurs. The network provides PSFCH resource information through RRC signaling or group common PDCCH in advance, so that when HARQ feedback needs to be transmitted, UEs can immediately use the pre-assigned resources without waiting for dynamic allocation, thus reducing latency while ensuring reliable feedback delivery.
3Reliability
If multiple PSFCH resources are configured for HARQ feedbacks, then feedback reliability improves, but device complexity and resource management difficulty increase
Solution Approach 1:
Multiple PSFCH resources are organized into structured groups, where each group corresponds to specific PSSCH resource allocations. This segmentation provides a clear mapping relationship between data resources and feedback resources, making it easier for devices to manage and select appropriate PSFCH resources based on their PSSCH transmissions, thereby reducing management complexity while maintaining multiple resource options for improved reliability.
Solution Approach 2:
The network pre-configures and signals the relationships between PSSCH resources and corresponding PSFCH resource groups to UEs in advance. This preliminary configuration establishes clear mapping rules that simplify device-side resource selection and management, reducing the complexity of handling multiple PSFCH resources while ensuring that appropriate feedback resources are always available for reliable HARQ operations.
Data Source
AI summary
A method for a first device to perform sidelink communication includes transmitting PSCCH(s) to at least one device; transmitting data to the at least one device through PSSCH(s) related to the PSCCH(s); determining PSFCH resources for receiving sidelink HARQ feedbacks related to the data based on an index of a slot related to the PSSCH(s) and an index of a subchannel; and receiving HARQ feedback(s) related to the data from the at least one device based on at least one PSFCH resource among the PSFCH resources, wherein the PSCCH(s) and the PSSCH(s) are transmitted to the at least one device based on first resource pool(s) for transmission, the PSFCH resources are determined within second resource pool(s) for reception, and connection information between the first resource pool(s) and the second resource pool(s) may be set in the first device.