Sidelink HARQ Feedback Mechanism for Wireless Reliability
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Solution Overview
Problem
The existing HARQ technology in sidelink communication systems, primarily used for vehicle networks, faces reliability challenges due to increased service types and user equipment density, leading to inefficiencies in data transmission and high delays.
Innovation Solution
The proposed solution involves user equipment with processing circuitry configured to transmit messages and receive feedback information through sidelinks, utilizing ACK and NACK signals to optimize feedback transmission, reduce collisions, and improve system performance by allowing multiple transmissions and auxiliary equipment assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitter performs active repeated transmission to ensure reliability, then the reliability of the service is improved, but the delay increases and the number of repeated transmissions increases
Solution Approach 1:
The patent implements a feedback mechanism where the receiving end sends ACK/NACK information to the transmitting end to indicate whether the message was successfully received. This allows the transmitting end to perform targeted retransmissions only when necessary, rather than using active repeated transmission, thereby reducing delay while maintaining reliability
Solution Approach 2:
The system dynamically adjusts the transmission strategy based on feedback information. When ACK is received, no retransmission is needed; when NACK is received, retransmission is triggered. This dynamic adaptation optimizes the balance between reliability and delay
2Reliability
If the transmitter performs active repeated transmission, then the reliability is improved, but the number of repeated transmissions increases leading to resource waste
Solution Approach 1:
The feedback mechanism enables the system to avoid unnecessary retransmissions. By receiving ACK information, the transmitting end can determine that the message was successfully received and can stop further transmissions, thereby improving transmission efficiency while maintaining reliability
Solution Approach 2:
The receiving end actively participates in the communication process by providing feedback information, enabling the transmitting end to make informed decisions about retransmission, thereby optimizing resource utilization
3Reliability
If feedback information is transmitted frequently to ensure reliability, then the reliability is improved, but feedback collisions increase
Solution Approach 1:
The patent extracts only the essential feedback information (ACK or NACK) that is necessary to indicate receiving status, removing redundant feedback transmissions. This reduces feedback collisions while maintaining the ability to ensure service reliability
4Reliability
If the receiving end transmits detailed receiving status information, then the reliability is improved, but the complexity of feedback information increases
Solution Approach 1:
The patent extracts only the critical receiving status information (ACK for successful reception, NACK for unsuccessful reception) from the detailed receiving status, simplifying the feedback information while maintaining the reliability needed for service
Data Source
AI summary
The present disclosure relates to user devices, wireless communication methods, and a computer readable storage medium. A user device serving as a transmitting end according to the present disclosure comprises a processing circuit and is configured to: send a message to a receiving end device by means of a sidelink; and receive feedback information indicating the message receiving state of the receiving end device, the feedback information comprising only one of ACK and NACK. The user devices, wireless communication methods, and computer readable storage medium according to the present disclosure can be used to rationally design HARQ technology for a sidelink, so as to satisfy the requirements of reliability of sidelink communication for different services.