D2D Terminal Coordination Using HARQ Resource Feedback
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Solution Overview
Problem
There is a lack of defined methods for sharing information between terminals to enhance communication efficiency in device-to-device (D2D) communication, particularly in enhancing the NR Sidelink's Enhanced Ultra Reliable Low Latency Communication (eURLLC).
Innovation Solution
A terminal is equipped to transmit and receive information related to resource selection via a Hybrid Automatic Repeat Request (HARQ) feedback channel, including sensing results, re-evaluation indications, or sidelink grants, to coordinate resource selection with another terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If terminals perform autonomous resource selection in D2D communication, then communication independence and speed are improved, but resource collisions and communication reliability deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where terminals exchange resource selection information, sensing results, and HARQ feedback through control channels. This allows terminals to adjust their resource selection based on received feedback, resolving the contradiction by maintaining fast autonomous selection while improving reliability through coordinated feedback-based adjustments
Solution Approach 2:
The patent introduces control information and sensing mechanisms as intermediaries that mediate between autonomous terminals. These intermediaries carry resource selection information and coordination data, enabling terminals to maintain independence while achieving coordinated resource selection that reduces collisions and improves reliability
2Reliability
If terminals exchange resource selection information through dedicated channels, then communication coordination and reliability are improved, but channel complexity and overhead increase
Solution Approach 1:
The patent merges resource selection information transmission with existing control channels, specifically combining it with HARQ feedback channel resources. This consolidation allows resource coordination information to be transmitted without requiring separate dedicated channels, thereby improving coordination reliability while avoiding additional channel complexity
Solution Approach 2:
The patent makes existing control channels multi-functional by enabling them to carry both traditional control information and resource selection coordination information. This universal usage of channels improves coordination capability without increasing the number of channels or system complexity
3Productivity
If terminals use HARQ feedback channel for information exchange, then resource utilization efficiency is improved, but information accuracy and coordination precision may deteriorate
Solution Approach 1:
The patent segments information into different priority levels and transmits critical coordination information with higher reliability requirements through more robust channels, while less critical information uses the HARQ feedback channel. This segmentation allows efficient use of HARQ resources while maintaining accuracy for important coordination data
Data Source
AI summary
A disclosed terminal includes a transmitter configured to transmit information relating to resource selection to another terminal via a resource relating to a HARQ (Hybrid automatic repeat request) feedback channel; and a receiver configured to receive data from the another terminal via a resource determined based on the information relating to the resource selection, wherein the information relating to the resource selection includes at least one of a sensing result, information indicating a resource determined based on sensing, an indication of re-evaluation or re-selection, or a sidelink grant.