NR V2X HARQ Feedback Resource Pool Configuration
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing V2X communication, particularly in managing HARQ feedback operations for sidelink communication in Next-Generation Radio (NR) networks, which is crucial for vehicle-to-everything (V2X) scenarios that require low latency and high reliability.
Innovation Solution
The method involves transmitting and receiving physical sidelink shared channels (PSSCH) and hybrid automatic repeat request (HARQ) feedback through a resource pool with specific configurations, where the resource pool includes multiple sub-channels and slots, allowing for efficient sidelink communication by optimizing the allocation and utilization of PSFCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is enabled for all PSSCH transmissions in NR V2X, then reliability is improved, but device complexity and resource management difficulty increase
Solution Approach 1:
The patent segments the PSFCH resources into multiple sets, where each set corresponds to a specific subset of PSSCH transmissions. This segmentation allows the transmitting UE to identify which PSFCH resource set to monitor based on the SCI information, thereby reducing the complexity of managing and processing HARQ feedback across all possible transmissions simultaneously.
Solution Approach 2:
The patent introduces SCI (Sidelink Control Information) as an intermediary mechanism that carries information about the PSFCH resource set associated with a PSSCH transmission. This intermediary allows the receiving UE to understand which PSFCH resources are relevant for feedback, simplifying the resource management complexity while maintaining reliable HARQ feedback.
2Reliability
If multiple PSFCH resources are allocated for HARQ feedback, then feedback reliability is improved, but loss of time for resource allocation and processing increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple PSFCH resource sets and their corresponding PSSCH transmission subsets before actual communication occurs. This allows UEs to quickly identify and process the correct PSFCH resources without time-consuming on-the-fly allocation decisions, reducing processing time while maintaining comprehensive feedback coverage.
Solution Approach 2:
The patent introduces dynamic flexibility in PSFCH resource allocation by allowing the network to configure different resource set mappings based on actual transmission conditions. This dynamic approach enables efficient time management by adapting resource allocation to real-time needs rather than using fixed, potentially inefficient static configurations.
3Adaptability or versatility
If resource pool includes multiple sub-channels and slots for PSFCH, then adaptability for different V2X scenarios is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by designing a resource pool structure that can serve multiple V2X scenarios (unicast, groupcast, broadcast) through a unified PSFCH resource set configuration mechanism. The same basic resource allocation framework adapts to different scenarios by configuring different subsets and mappings, eliminating the need for separate complex configurations for each scenario type.
Solution Approach 2:
The patent utilizes parameter changes to adapt the resource pool configuration to different V2X scenarios. By modifying parameters such as the number of PSFCH resource sets, the mapping between PSSCH and PSFCH resources, and the timing relationships, the system can adapt to various communication scenarios without increasing fundamental device complexity.
Data Source
AI summary
According to an embodiment of the present disclosure, a method for performing sidelink communication by a first device is provided. The method comprises the steps of: transmitting at least one PSSCH to at least one reception device by using at least one sub channel and at least one slot in a resource pool; and receiving at least one HARQ feedback for the at least one PSSCH through at least one PSFCH resource from among M PSFCH resources in the resource pool, wherein the resource pool comprises K PSSCH-associated slots and L sub channels, which are associated with the PSFCH resources, M is greater than or equal to K*L, and K, L, and M may be positive integers.