D2D Relay Signaling for V2X Network Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling relay requests and performing relaying operations based on relay request information and discovery signals in device-to-device (D2D) communication, particularly in vehicle-to-everything (V2X) scenarios, where direct UE-to-UE communication is desired without intervention from an evolved Node B (eNB).
Innovation Solution
A method for performing D2D relay communication that involves receiving relay request information, transmitting a response signal upon discovering a destination UE, and sending a relay signal once the destination UE is identified, utilizing discovery signals and signal quality metrics like RSRP and RSRQ to determine successful discovery and optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If D2D communication is implemented to reduce network overhead, then network overhead is reduced and data transmission rates increase, but relay request handling complexity increases
Solution Approach 1:
The patent applies preliminary action by implementing discovery signals that allow UEs to pre-discover and register with destination UEs before relay communication is needed. This pre-discovery mechanism stores destination UE information in advance, so when relay requests occur, the handling complexity is reduced because the destination UE is already known and registered in the system.
2Productivity
If direct UE-to-UE communication is established without eNB intervention, then data transmission rates increase and network capacity improves, but reliability of relay communication decreases
Solution Approach 1:
The patent implements feedback mechanisms where UEs transmit discovery signals and relay requests that provide continuous information about communication status, destination UE availability, and channel conditions. This feedback loop allows UEs to adapt their transmission parameters and select appropriate relays, maintaining reliability while enabling direct communication without constant eNB intervention.
Solution Approach 2:
The patent uses discovery signals as an intermediary mechanism that facilitates relay communication between UEs. These signals act as mediators that carry destination UE information and enable UEs to establish communication paths autonomously, balancing the need for direct high-rate transmission with the requirement for reliable relay selection without continuous eNB control.
3Adaptability or versatility
If relay request information is transmitted to handle relaying operations, then relay communication is enabled, but signal transmission overhead increases
Solution Approach 1:
The patent merges relay request information with existing discovery signal transmissions. Instead of sending separate relay request messages, the destination UE information is embedded within discovery signals that UEs already transmit for other purposes. This combining approach enables relay communication functionality while utilizing existing signal structures, thereby reducing additional overhead.
Data Source
AI summary
Disclosed according to various embodiments of the present invention are a method and a device for preforming device-to-device (D2D) relay communication. Disclosed are a method and a device for performing device-to-device (D2D) relay communication, the method comprising the steps of: receiving, from second UE, a signal including relay request information; transmitting a response signal to the second UE if destination UE corresponding to destination UE ID included in the relay request information has been found; and transmitting a relay signal to the destination UE.