D2D Relay Selection Using Candidate Status Feedback
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Solution Overview
Problem
Current D2D communication systems face challenges in identifying suitable UE within network coverage to act as relay UEs for transmitting data from UE outside network coverage to a base station.
Innovation Solution
A method where the source UE sends a first message to multiple candidate UEs within network coverage, receiving status information from each, and determines the most suitable UE based on criteria such as memory usage, power supply, processing capability, or link status to relay data to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source UE sends a relay request to multiple candidate UEs and waits for responses, then the reliability of relay selection is improved, but the signaling overhead and time delay increase
Solution Approach 1:
The patent applies preliminary action by having candidate UEs pre-monitor for relay requests and have their relay capability information (memory usage, power supply status, processing capability, link status) pre-prepared and ready for immediate response. When a relay request is received, the candidate UE can quickly determine and respond with its suitability status without needing to gather this information in real-time, thus reducing the overall relay discovery time while maintaining reliable multi-UE evaluation
Solution Approach 2:
The patent implements feedback by having candidate UEs send response messages back to the source UE indicating their relay suitability status. This feedback mechanism allows the source UE to make an informed selection based on actual status information from multiple candidates, improving reliability. The feedback includes specific parameters like memory usage, power supply status, and link quality, enabling the source UE to select the most appropriate relay UE
2Reliability
If the source UE sends a relay request to multiple candidate UEs and waits for responses, then the reliability of relay selection is improved, but the signaling overhead increases
Solution Approach 1:
The patent extracts only the essential relay suitability information from candidate UEs and includes it in compact response messages. Instead of exchanging extensive signaling sequences, the response messages contain specific extracted parameters (memory usage, power supply status, processing capability, link status) that directly indicate relay suitability. This extraction approach reduces signaling overhead while maintaining the ability to make reliable relay selection decisions
Solution Approach 2:
The patent applies partial action by having candidate UEs send response messages only when they are suitable for relay service, rather than all candidate UEs responding regardless of suitability. The source UE sends relay requests to multiple candidates, but only those meeting certain criteria send responses, reducing overall signaling overhead while still maintaining reliable selection through multi-UE evaluation
3Reliability
If the source UE selects relay UE based on comprehensive status information, then the reliability of data transmission is improved, but the complexity of the selection process increases
Solution Approach 1:
The patent applies local quality by having different candidate UEs exhibit different status characteristics (memory usage, power supply, processing capability, link status) that are specific to their local conditions. The source UE evaluates these local quality parameters from each candidate and selects the relay UE whose local status best matches the requirements for reliable data transmission. This allows reliable selection without requiring a complex centralized control mechanism
Solution Approach 2:
The patent uses parameter changes by monitoring and comparing key status parameters (memory usage, power supply status, processing capability, link status) of candidate UEs. The source UE selects the relay UE based on these parameters, which dynamically change based on the current state of each candidate. This parameter-based selection approach provides a systematic yet relatively simple method to achieve reliable relay selection without complex decision logic
Data Source
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AI summary
Embodiments of the present invention provide a D2D data transmission method and system, and a device, so as to resolve at least a prior-art problem about how to find UE in network coverage that can be used as relay UE, to transmit information from UE out of network coverage to a base station. The method includes: sending, by source UE, a first message to n candidate UEs, where the first message is used to indicate that the source UE needs to transmit data to a base station, the source UE is UE out of a network coverage area of the base station, and the n candidate UEs are UEs in the network coverage area of the base station; receiving, by the source UE, n second messages from the n candidate UEs, where each of the n candidate UEs sends one second message to the source UE, and the second message includes a user identity of each candidate UE and/or status information of each candidate UE; determining, by the source UE, relay UE from the n candidate UEs according to the user identity of each candidate UE and/or the status information of each candidate UE; and transmitting the data to the base station by using the relay UE. The present invention is applicable to the field of wireless communications.