Sidelink Feedback Resource Determination for D2D Reliability
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Solution Overview
Problem
In device-to-device (D2D) communication, the lack of a feedback mechanism leads to unreliable data transmission, as the receive end does not send feedback information to the transmit end, making it difficult for the transmit end to determine if the data was successfully sent, thereby degrading the reliability of D2D communication.
Innovation Solution
A feedback method is introduced where the first user equipment determines a feedback resource based on the physical resource occupied by the data sent by the second user equipment and/or identification information of the second user equipment, and sends feedback information on this resource to the second user equipment, allowing the second user equipment to determine if the data was successfully received, enabling retransmission if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a feedback mechanism is introduced to improve reliability, then the transmit end can determine successful data receipt, but the device complexity increases due to additional feedback resources and signaling
Solution Approach 1:
The patent implements a feedback mechanism where the first user equipment sends feedback information to the second user equipment on determined feedback resources. This feedback indicates whether data was successfully received, allowing the transmit end to determine reception status and perform retransmissions if necessary, thereby improving communication reliability
Solution Approach 2:
The first user equipment autonomously determines feedback resources based on physical resource information and identification information from the data sent by the second user equipment, without requiring centralized resource allocation. This self-service approach reduces signaling overhead and system complexity while establishing reliable feedback channels
2Reliability
If feedback resources are allocated for each data transmission, then reliable acknowledgment is achieved, but the loss of time increases due to resource allocation overhead
Solution Approach 1:
The patent enables the first user equipment to directly determine feedback resources using pre-configured rules based on the physical resource information and identification information of the received data. This preliminary establishment of feedback resource mapping eliminates the need for real-time resource allocation signaling, reducing time loss while ensuring reliable feedback transmission
Data Source
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AI summary
Embodiments of this application provide a feedback method and user equipment. The method includes: determining, by first user equipment, a feedback resource based on a physical resource occupied by data sent by second user equipment and/or identification information of the second user equipment, where the feedback resource is a resource determined by the first user equipment after receiving the data sent by the second user equipment; and sending, by the first user equipment, feedback information to the second user equipment on the feedback resource, where the feedback information is used to feed back a result of receiving the data by the first user equipment. This application can improve reliability of sidelink communication.