Sidelink Feedback Resource Pooling for Reliable NR-V2X Transmission
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Solution Overview
Problem
The existing NR-V2X system's physical sidelink feedback channel (PSFCH) format is inadequate for supporting higher throughput, lower latency, and flexible resource allocation required by advanced V2X systems, particularly in unlicensed spectra, due to its limited capacity and format constraints.
Innovation Solution
Introduce a method for configuring multiple types of sidelink feedback channels, including a first-type PSFCH with interlaced resource blocks and a second-type PSFCH with sequence-based transmission, allowing flexible resource allocation and enhanced capacity on unlicensed spectra, along with multiple transmission opportunities to improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback resources are dynamically allocated for each sidelink transmission, then the reliability of feedback transmission is improved, but the signaling overhead and resource waste increase
Solution Approach 1:
The feedback resource pool is segmented into multiple candidate resources, and the terminal selects appropriate resources based on transmission conditions. This segmentation allows the system to provide reliable feedback transmission when needed while avoiding allocation of resources when not required, thus resolving the contradiction between reliability and resource overhead.
Solution Approach 2:
The feedback resource allocation is made dynamic through selection from multiple candidate resources based on transmission conditions such as channel state and traffic requirements. This dynamic approach ensures reliability when conditions demand it while reducing overhead when conditions permit, balancing the two opposing requirements.
2Speed
If feedback resources are pre-configured for all possible scenarios, then the responsiveness to feedback requirements is improved, but the resource waste increases
Solution Approach 1:
Multiple candidate feedback resources are pre-configured in advance, enabling rapid selection and transmission when feedback is needed. However, not all resources are actively used simultaneously - instead, the terminal selects from the pre-configured candidates based on actual transmission needs, thus maintaining responsiveness while avoiding resource waste.
Solution Approach 2:
The system changes the parameter of resource selection based on transmission conditions, switching between different candidate resources dynamically. This allows the system to maintain readiness for fast feedback transmission while adapting resource usage to actual needs, preventing waste of pre-configured resources.
3Adaptability or versatility
If multiple feedback resources are configured for selection, then the adaptability to different transmission conditions is improved, but the device complexity increases
Solution Approach 1:
Different candidate feedback resources are configured with different local qualities or characteristics suitable for different transmission conditions. The terminal selects resources based on local conditions such as channel state, providing adaptability without requiring complex global optimization algorithms, thus managing device complexity effectively.
Data Source
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AI summary
The disclosure relates to a method for configuring a sidelink (SL) feedback resource, a terminal device, and a network device. The method includes the following. A first terminal device obtains resource pool configuration information, where the resource pool configuration information includes resource pool indication information of a transmission resource of a SL data channel and resource pool indication information of a transmission resource of a SL feedback channel. The SL data channel is for transmitting first SL data, and the SL feedback channel includes a first-type SL feedback channel and a second-type SL feedback channel. With implementations of the disclosure, probability of successful transmission of the SL feedback information can be improved.