Sidelink HARQ Feedback Resource Allocation in NR V2X
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Solution Overview
Problem
The existing LTE V2X system faces challenges in designing a HARQ feedback report mechanism that meets the requirements of 5G NR V2X, particularly in supporting Groupcast and Unicast functions, and requires a solution to efficiently manage sidelink feedback channel operations.
Innovation Solution
A method is introduced where a first node receives information to determine a target time-frequency resource set, transmits a signal using a different frequency-domain resource pool, and receives a second signal with a specific timing relation, ensuring that the HARQ-ACK report to the base station meets minimum delay requirements and accounts for the processing capability of User Equipment (UE), while allowing independent configuration of uplink and sidelink BWP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a HARQ feedback report mechanism is designed for NR V2X to support Groupcast and Unicast functions, then the system functionality and reliability are improved, but the device complexity and processing burden on UE increase
Solution Approach 1:
The patent segments the feedback reporting process by introducing separate PSFCH resources for different feedback types (ACK/NACK for sidelink, HARQ-ACK for uplink). This segmentation allows the UE to handle different feedback scenarios independently, reducing overall processing complexity while maintaining reliability.
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station configures and manages the feedback resources through RRC signaling and DCI formats. This intermediary approach offloads the complexity from the UE to the network side, which handles resource allocation and coordination, thereby reducing UE processing burden while ensuring reliable feedback reporting.
2Adaptability or versatility
If independent configuration of uplink and sidelink BWP is implemented, then the adaptability and versatility of the system are improved, but the device complexity and configuration management burden increase
Solution Approach 1:
The patent implements a universal configuration framework where a single RRC configuration structure (RRCConfig) handles both uplink and sidelink BWP parameters. This multi-functional configuration approach allows the same configuration mechanism to serve multiple purposes (uplink and sidelink), providing flexibility while avoiding the need for separate complex configuration systems.
Solution Approach 2:
The patent introduces dynamic BWP switching capabilities where the base station can flexibly allocate and switch between different BWPs for uplink and sidelink based on traffic requirements. This dynamic approach allows the system to adapt to varying conditions while the network manages the complexity of switching decisions, reducing UE burden.
3Productivity
If the timing relation between first signal transmission and second signal reception is strictly enforced to meet minimum delay requirements, then the productivity and response time are improved, but the device complexity in timing management increases
Solution Approach 1:
The patent defines specific timing parameters (K1, K2, K3) that represent fixed time offsets between different signals. By parameterizing the timing relations in this way, the system achieves predictable and efficient timing management where the UE simply needs to apply these predefined offsets, reducing the complexity of real-time timing calculations while maintaining fast response.
4Reliability
If PSFCH resources are allocated from a resource pool different from the first frequency-domain resource pool, then the system reliability and resource management flexibility are improved, but the device complexity in resource coordination increases
Solution Approach 1:
The patent extracts the feedback resource allocation from the original frequency-domain resource pool and places it in a separate PSFCH resource pool. This extraction ensures that feedback resources are independently managed and do not conflict with data transmission resources, improving reliability. The network side manages this separation through configuration parameters, keeping UE complexity manageable.
Data Source
AI summary
The present disclosure provides a method and device in a node for wireless communications. A node receives first information, the first information is used to determine a target time-frequency resource set, an earliest multicarrier symbol comprised in the target time-frequency resource set in time domain is a first multicarrier symbol, frequency-domain resources comprised in the target time-frequency resource set belong to a first frequency-domain resource pool; transmits a first signal, frequency-domain resources occupied by the first signal belong to a second frequency-domain resource pool, a frequency-domain relation between the first frequency-domain resource pool and the second frequency-domain resource pool is used to determine a reference delay; receives a second signal, a length of a time interval between a start time of a second multicarrier symbol and an end time for receiving the second signal is equal to the reference delay. The application ensures the correct reception of the feedback.