D2D Discovery Signal Segmentation for Out-of-Coverage Relay
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Solution Overview
Problem
In Device-to-Device (D2D) communication systems, devices outside cellular base station coverage face challenges in discovering counterparts and establishing connections without relying on cellular base stations, particularly in scenarios where direct communication is necessary for efficient data transmission and emergency event notification.
Innovation Solution
A method and apparatus for efficient discovery in D2D communication systems, involving the generation and transmission of discovery signals with specific indicators, allowing devices to discover relay UEs or group members outside cellular base station coverage, and transmitting event information using direct device-to-device communication or local transmission schemes when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices use conventional D2D discovery procedures requiring base station access, then device information can be acquired through centralized server, but devices outside base station coverage cannot establish communication
Solution Approach 1:
The patent introduces a relay device as an intermediary between devices outside base station coverage and the network. The relay device receives discovery information from the base station and forwards it to remote devices, enabling indirect access to centralized device information while maintaining D2D communication capability outside coverage areas.
Solution Approach 2:
The patent segments the discovery information into two parts: essential information transmitted through the relay device for basic D2D establishment, and detailed information available only through base station access. This segmentation allows partial functionality outside coverage while maintaining overall system reliability.
2Loss of information
If devices transmit complete device information in discovery signals, then comprehensive information is available for discovery, but signal size and transmission overhead increase
Solution Approach 1:
The patent divides device information into essential discovery information (transmitted in discovery signals) and detailed information (transmitted separately upon request). This segmentation reduces the data volume in discovery signals while ensuring complete information is eventually available for devices that need it.
Solution Approach 2:
The patent extracts only the most critical device information elements needed for initial D2D discovery and transmission them in discovery signals. Additional detailed information is extracted and transmitted separately when required, optimizing the balance between information completeness and signal efficiency.
3Loss of information
If devices request additional information after initial discovery, then complete device information can be obtained, but communication delay increases
Solution Approach 1:
The patent performs preliminary transmission of essential device information in the discovery signal itself, allowing devices to make immediate discovery decisions without waiting for additional information requests and responses. This preliminary action reduces the time loss while still providing complete information when needed.
Data Source
AI summary
The present disclosure relates to a 5G or pre-5G communication system to be provided in order to support a higher data transmission rate following 4G communication systems such as LTE. Disclosed are a method and device for improving device searching in a D2D communication system supporting direct communication between devices. The method comprises the steps of: generating a search signal including search information; selecting a transmission resource to transmit the search signal; transmitting the search signal through the selected transmission resource; and when a request signal requesting additional information on the search from a counterpart device that has received the search signal is received, transmitting a confirmation signal including the requested additional information to the counterpart device. The present disclosure relates to a communication technique and system which combine a 5G communication system, for supporting a higher data transmission rate following 4G systems, with IoT technology.