Sidelink Feedback Mechanism for NR-V2X Reliability
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Solution Overview
Problem
In NR-V2X vehicle communication, there is a need for a feedback mechanism to improve the reliability of sidelink data transmission, particularly for unicast and groupcast services, as existing LTE-V2X systems lack reliable feedback mechanisms for sidelink transmissions.
Innovation Solution
A transmission apparatus and method that enables user equipment (UE) to receive or generate sidelink feedback information and transmit it to a network device, providing a feedback mechanism for sidelink transmission, which includes receiving and transmitting feedback information between UEs and the network device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback mechanism is introduced for sidelink transmission, then reliability of data transmission is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the target UE sends feedback information (ACK/NACK) to the source UE about the successful reception of sidelink data. The source UE uses this feedback to determine whether retransmission is needed, thereby improving transmission reliability through closed-loop control.
Solution Approach 2:
The patent introduces the network device as an intermediary that schedules and coordinates the feedback mechanism. The network device allocates resources for feedback transmission and manages the overall sidelink communication process, reducing the complexity burden on individual UEs.
2Reliability
If feedback information transmission is added to sidelink protocol, then transmission reliability is enhanced, but loss of time increases
Solution Approach 1:
The patent employs hybrid automatic repeat request (HARQ) where the source UE prepares and sends data packets with redundancy information in advance. The target UE can immediately decode upon receiving feedback, reducing the time loss associated with retransmission preparation.
Solution Approach 2:
The feedback mechanism operates in periodic time slots where feedback information is transmitted at predetermined intervals. This periodic structure allows both UEs to efficiently manage their transmission schedules and minimizes idle waiting time.
Data Source
AI summary
A transmission apparatus and method of feedback information. A user equipment receives or generates sidelink feedback information and transmit the sidelink feedback information to a network device, thereby providing a feedback mechanism of sidelink transmission, and improving reliability of data transmission of a sidelink.