D2D Synchronization Signal Transmission Mode Selection
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing increasing mobile traffic, particularly in transmitting device-to-device (D2D) synchronization signals, which is crucial for next-generation mobile communication standards like LTE-A and WiMAX, to improve network capacity and coverage.
Innovation Solution
A method for transmitting D2D synchronization signals by user equipment (UE) in a wireless communication system, where the UE receives a signal from an evolved Node B (eNB) indicating either a first transmission mode based on eNB initiation or a second mode when the reference signal received power (RSRP) is below a threshold, allowing flexible and efficient D2DSS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D2D synchronization signal transmission is performed in all coverage areas, then synchronization coverage is improved, but network interference increases
Solution Approach 1:
The patent applies local quality by differentiating D2DSS transmission behavior based on geographic location and coverage conditions. In-coverage UEs follow network-configured transmission rules, while out-of-coverage UEs autonomously initiate transmission. This localized adaptation ensures synchronization availability in each area without causing unnecessary interference in well-covered regions.
Solution Approach 2:
The patent implements dynamic transmission control where UEs adapt their D2DSS transmission behavior based on real-time coverage conditions and RSRP measurements. The network dynamically configures transmission parameters for in-coverage UEs, and out-of-coverage UEs dynamically decide to transmit when detecting insufficient signal quality, optimizing the balance between coverage and interference.
2Reliability
If multiple UEs transmit D2D synchronization signals simultaneously, then synchronization availability is improved, but resource collision increases
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure D2DSS transmission resources and parameters for in-coverage UEs before transmission occurs. This advance configuration prevents resource collisions by ensuring that multiple UEs use coordinated, non-conflicting resources. Out-of-coverage UEs also perform preliminary detection of coverage status before autonomously initiating transmission.
Solution Approach 2:
The network acts as an intermediary that coordinates D2DSS transmission resources among multiple UEs. By configuring transmission parameters, resource allocations, and timing for in-coverage UEs, the network mediates potential resource collisions before they occur, ensuring synchronized availability without conflict.
3Productivity
If D2D synchronization signal transmission is controlled by RSRP threshold, then transmission efficiency is improved, but synchronization delay increases
Solution Approach 1:
The patent segments UE behavior into two distinct modes based on coverage status: network-controlled mode for in-coverage UEs and autonomous mode for out-of-coverage UEs. This segmentation allows optimized transmission control for each group, with network-configured UEs experiencing minimal delay and autonomous UEs using RSRP-based triggering only when necessary, overall improving efficiency without excessive delay.
Data Source
AI summary
Disclosed is a method for transmitting a synchronization signal of device-to-device (D2D) communication. The method for transmitting a D2D synchronization signal of the present application may comprise a step for transmitting a D2D synchronization signal according to one of transmission modes predetermined on the basis of an instruction of a base station. In addition, a transmission mode for D2D transmission may comprise a transmission mode on the basis of a signaling from the base station and a transmission mode on the basis of a reference signal reception power.