Sidelink HARQ Feedback Signaling for Smarter NR-V2X Scheduling
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Solution Overview
Problem
In a 5G New Radio (NR) vehicle-to-everything (V2X) communication system, when a network device fails to receive Hybrid Automatic Repeat Request (HARQ) feedback from a terminal device, it may either waste system resources by scheduling a retransmission that is not needed or fail to provide necessary resources, affecting data transmission performance.
Innovation Solution
The terminal device generates and sends acknowledgement information to the network device when it does not perform transmission on a sidelink, and the network device adjusts its resource scheduling accordingly to avoid resource waste and ensure data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device schedules a retransmission resource when HARQ feedback is not received, then the transmission reliability is improved, but system resource waste occurs
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device sends HARQ feedback information to the network device to indicate sidelink transmission status. When feedback is successfully received, the network device accurately determines transmission status and avoids unnecessary retransmissions. The feedback loop includes scenarios where the terminal sends feedback on uplink resources or sidelink resources, resolving the contradiction by enabling informed resource allocation decisions based on actual transmission outcomes
Solution Approach 2:
The patent applies preliminary action by having the terminal device send HARQ feedback information before the network device makes resource allocation decisions. The feedback is transmitted in advance on configured uplink resources or sidelink resources, allowing the network device to proactively adjust resource scheduling based on the received feedback, thus preventing both resource waste and transmission failures
2Loss of energy
If the network device does not schedule a retransmission resource when HARQ feedback is not received, then system resource waste is avoided, but transmission performance is affected
Solution Approach 1:
The feedback mechanism ensures the network device receives accurate transmission status information from the terminal device. When feedback is successfully received indicating successful sidelink transmission, the network device correctly refrains from scheduling retransmissions, avoiding resource waste while maintaining transmission performance through accurate status determination
Solution Approach 2:
The patent replaces the mechanical assumption-based resource allocation (where the network device must assume transmission failure when feedback is lost) with an information-based system. By substituting the feedback information transmission mechanism, the network device can make accurate resource allocation decisions without unnecessarily scheduling retransmissions, thus avoiding resource waste while maintaining reliability
3Reliability
If the terminal device sends HARQ feedback on uplink resources, then the feedback transmission reliability is improved, but uplink resource overhead increases
Solution Approach 1:
The patent makes uplink resources multi-functional by using them for both data transmission and HARQ feedback transmission. The same uplink resources that carry user data also carry HARQ feedback information, eliminating the need for dedicated feedback resources. This resolves the contradiction by achieving reliable feedback transmission without increasing overall uplink resource overhead, as the resources serve dual purposes
4Quantity of substance
If the terminal device sends HARQ feedback on sidelink resources, then the uplink resource overhead is reduced, but the feedback transmission reliability may be affected
Solution Approach 1:
The patent applies local quality by adapting the feedback transmission method to local conditions. When sidelink resources are used for feedback, the system optimizes for scenarios where uplink resources are constrained. The terminal device transmits feedback on sidelink resources with appropriate power control and resource selection, achieving acceptable feedback reliability while reducing uplink resource overhead in specific local contexts
Data Source
Figure 1A
Figure 1B~1C
Figure 2~3
AI summary
This application provides a communication processing method and a communication device, to avoid a waste of system resources and ensure data transmission performance of a sidelink. A first terminal device generates first acknowledgement information when the first terminal device does not perform transmission on a sidelink by using a first resource, where the sidelink is a wireless direct communication link between the first terminal device and a second terminal device; and then, the first terminal device sends the first acknowledgement information to the network device.