D2D Terminal Discovery via SINR-Based Response Delay
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Solution Overview
Problem
In disaster situations where communication infrastructure is partially or fully unavailable, terminals in affected areas face challenges in searching for neighbor base stations, leading to resource conflicts and inefficient resource utilization due to indiscriminate signal transmissions in device-to-device (D2D) communication systems.
Innovation Solution
A method for terminal discovery in wireless communication systems that involves transmitting a discovery signal and receiving a response signal based on a response delay time determined by the signal-to-interference noise ratio (SINR), minimizing resource conflicts by selecting terminals for subsequent discovery processes based on their response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If terminals transmit discovery signals indiscriminately in disaster situations, then terminal discovery capability is improved, but resource conflict between D2D terminals and cellular resources increases
Solution Approach 1:
The patent changes the parameter of response delay time based on reception SINR values. Terminals with better signal quality (higher SINR) are assigned shorter response delay times, while terminals with poorer signal quality are assigned longer delay times. This dynamic parameter adjustment resolves the contradiction by enabling effective terminal discovery through structured response timing while minimizing resource conflicts through SINR-based differentiation.
Solution Approach 2:
The patent introduces dynamic response delay time adjustment based on real-time SINR measurements. Instead of using fixed delay times, the system dynamically adapts the response delay according to the received signal quality, allowing the discovery process to respond to changing channel conditions and reducing resource conflicts adaptively.
2Productivity
If terminals transmit discovery signals frequently to ensure discovery, then discovery efficiency is improved, but resource utilization of cellular resources deteriorates
Solution Approach 1:
The patent applies partial action by having only certain terminals (those with good SINR) respond with short delay times, while other terminals respond with longer delay times or wait for subsequent discovery opportunities. This partial response strategy maintains discovery efficiency for critical terminals while reducing overall resource consumption compared to all terminals responding simultaneously.
Solution Approach 2:
The patent implements periodic discovery signals with structured response timing. Terminals transmit discovery signals at regular intervals, and response signals are transmitted periodically based on SINR-determined delay times. This periodic structure ensures continuous discovery capability while allowing cellular resources to be reused in an organized manner, improving resource utilization.
3Speed
If response delay time is shortened for faster discovery, then discovery speed is improved, but signal quality requirements increase leading to more conflicts
Solution Approach 1:
The patent applies local quality by assigning different response delay times to different terminals based on their individual SINR conditions. Terminals with high signal quality (good SINR) are permitted to respond with short delay times for fast discovery, while terminals with low signal quality are assigned longer delay times to ensure reliable detection. This localized quality adjustment resolves the contradiction between speed and reliability.
Solution Approach 2:
The patent uses SINR feedback to dynamically determine response delay times. Terminals measure the SINR of received discovery signals and use this feedback information to adjust their response timing. This feedback mechanism ensures that discovery speed is optimized for high-quality signals while maintaining reliability for lower-quality signals through appropriate delay adjustments.
Data Source
AI summary
Disclosed are a terminal discovery method in a wireless communication system supporting device-to-device (D2D) communication, and a device therefor. The method for discovering a terminal in a wireless communication system supporting device-to-device (D2D) communication, includes transmitting, by a terminal, a discovery signal, and receiving, by the terminal, a response signal as a response with respect to the discovery signal from a different terminal, wherein the response signal is transmitted by the different terminal when a response delay time determined on the basis of a reception signal-to-interference noise ratio (SINR) terminates.