V2X Feedback Resource Selection for Flexible UE Response
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Solution Overview
Problem
Existing technologies lack a systematic approach for flexible feedback in V2X transmission, particularly in 5G networks, to meet varying service requirements of unicast and groupcast communications between user equipment (UEs) that may or may not be within network coverage.
Innovation Solution
A method and device for flexible feedback in V2X transmission, where UEs dynamically indicate and receive feedback requirements, selecting appropriate time-frequency resources based on predefined parameters or network assistance, ensuring compliance with service requirements such as HARQ feedback type, delay, reliability, and frequency alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback is introduced in V2X unicast or groupcast transmission, then the reliability of data transmission is improved, but the system complexity and resource overhead increase
Solution Approach 1:
The feedback mechanism is segmented into different types (ACK/NACK for unicast, NACK-only for groupcast) and different feedback resources (dedicated PUCCH resources, shared PUCCH resources, or PSFCH resources). This segmentation allows the system to apply appropriate feedback complexity based on the specific service requirement, achieving reliability improvement without unnecessary complexity overhead.
Solution Approach 2:
The feedback mechanism is made dynamic through configurable feedback requirements that can be indicated by the transmitting UE. The feedback type, resource selection, and transmission parameters can be dynamically adjusted based on service requirements, allowing the system to adapt between simple and complex feedback modes as needed.
2Adaptability or versatility
If feedback requirements are dynamically indicated to meet varying service requirements, then the adaptability is improved, but the signaling overhead and processing complexity increase
Solution Approach 1:
The feedback system uses parameter changes to achieve adaptability. The transmitting UE indicates feedback requirements through parameters such as feedback type (ACK/NACK, NACK-only), feedback resource selection, and timing parameters. These parameter changes allow dynamic adaptation to different service requirements without requiring complex protocol changes or additional system architecture.
3Adaptability or versatility
If UEs select feedback resources autonomously outside network coverage, then the system's operational capability in coverage-free scenarios is improved, but the resource coordination efficiency deteriorates
Solution Approach 1:
The system applies preliminary action by pre-configuring resource pools and feedback resource selections before V2X communication occurs. UEs can autonomously select feedback resources from pre-defined pools based on indicated requirements, enabling operation without network coverage while maintaining reasonable resource coordination through advance preparation and standardized selection rules.
Data Source
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AI summary
A method and a device for flexible feedback in V2X transmission, and a user equipment are provided. The method implemented in a receiving UE (user equipment) includes the following. A feedback requirement indicated by a transmitting UE is received during V2X transmission. A feedback resource is determined according to the feedback requirement. Feedback information is sent to the transmitting UE on the feedback resource according to the feedback requirement. The method implemented in a transmitting UE includes the following. A feedback requirement is indicated to a receiving UE during V2X transmission. Feedback information sent by the receiving UE on a feedback resource according to the feedback requirement is received, where the feedback resource is determined by the receiving UE according to the feedback requirement. According to this application, it is possible to implement flexible feedback while a service requirement of the transmitting UE is met.