D2D Link Failure Declaration and Relay Selection
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Solution Overview
Problem
Current wireless communication systems face challenges in managing Device-to-Device (D2D) link failures, which can lead to network overload and unstable communication due to the increasing data traffic, as they lack effective methods for monitoring and declaring link failures in D2D communication.
Innovation Solution
A method for performing D2D communication that involves D2D link monitoring (DLM) and declaring link failure (DLF), where a first device transmits a DLF declaration to a third device when predetermined conditions are met, such as consecutive negative acknowledgements or low demodulation performance, and the third device determines a relay device to maintain communication between the first and second devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication is implemented to reduce base station load, then network overload is reduced, but link failure management becomes complex and unreliable
Solution Approach 1:
The patent implements a feedback mechanism where the receiving device monitors D2D link quality and sends feedback information to the transmitting device. When link quality deteriorates below a threshold, the receiving device triggers a link failure declaration and notifies the base station, enabling dynamic adaptation and reliable link management in D2D communication.
2Productivity
If direct D2D link is established between user equipments, then communication efficiency is improved, but link failure detection and management becomes difficult
Solution Approach 1:
The receiving device actively monitors D2D link quality by measuring reference signals from the transmitting device and provides feedback information. When link quality falls below a threshold or acknowledgments are not received within a predetermined time, the receiving device declares link failure and notifies the base station, enabling effective link failure detection in direct D2D communication.
Solution Approach 2:
The base station acts as an intermediary that receives link failure notifications from user equipments and coordinates relay device selection. When link failure is detected, the base station identifies and assigns a relay device to restore communication, mediating the failure recovery process between directly communicating user equipments.
3Reliability
If relay device is introduced to maintain communication continuity, then communication stability is improved, but device complexity increases
Solution Approach 1:
The base station serves as a central coordinator that manages relay device selection and assignment. When link failure occurs, the base station identifies suitable relay devices from available user equipments and assigns one to restore communication, centralizing the complexity management while maintaining communication continuity.
Solution Approach 2:
Any user equipment in the network can potentially serve as a relay device for other user equipments experiencing link failures. This universal relay capability allows the system to dynamically select from multiple potential relay candidates without requiring dedicated relay infrastructure, reducing overall system complexity.
Data Source
AI summary
According to one embodiment of the present invention, a method for performing device-to-device (D2D) communication is a method for performing, by a first device, D2D communication in a wireless communication system, including the steps of: performing D2D link monitoring (DLM); when the DLM result meets a predetermined condition, transmitting a D2D link failure (DLF) declaration to a third device; and performing communication with a second device in a fourth device determined by the third device.