D2D Signal Transmission Using SFN Distance Thresholds
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving device-to-device (D2D) signals, particularly in terms of coverage and resource utilization, due to interference between Single Frequency Network (SFN) User Equipments (UEs) and the need for effective resource management in D2D communication.
Innovation Solution
The method involves using an SFN scheme for transmitting D2D signals, where the decision to perform SFN is based on the distance from the source device, optimizing coverage and reducing interference by determining whether to use the SFN scheme based on priority and resource availability, including signaling information such as priority, resource configuration, and hop count to manage signal transmission efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If SFN scheme is used for D2D signal transmission, then coverage is improved and radio resource efficiency is enhanced, but interference between SFN UEs occurs
Solution Approach 1:
The patent applies local quality by allowing SFN transmission only within a specific distance range from the source UE. Relay UEs determine whether to participate in SFN based on their distance to the source, creating different transmission behaviors in different spatial locations. This resolves the contradiction by enabling SFN benefits (improved coverage) only where interference risks are minimal.
Solution Approach 2:
The patent changes the parameter of transmission distance threshold to control SFN participation. By adjusting the distance parameter, the system dynamically determines which UEs should participate in SFN transmission, thereby optimizing the balance between coverage enhancement and interference avoidance based on spatial conditions.
2Productivity
If SFN scheme is used for D2D signal transmission, then radio resource efficiency is improved, but resource management complexity increases
Solution Approach 1:
The patent implements self-service by enabling relay UEs to autonomously determine their participation in SFN transmission based on pre-configured distance thresholds and their own measured distances to source UEs. This self decision-making process eliminates the need for complex centralized resource management, allowing efficient radio resource utilization without increasing system management complexity.
3Object-generated harmful factors
If distance-based SFN determination is implemented, then interference between SFN UEs is reduced, but measurement and decision complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring distance thresholds and SFN parameters before D2D communication begins. Relay UEs simply compare their measured distance against these pre-set thresholds to make SFN participation decisions, avoiding complex real-time calculations and reducing measurement decision complexity while maintaining effective interference control.
Data Source
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AI summary
A method, according to one embodiment of the present invention, for transmitting device-to-device (D2D) signals by a first terminal supporting D2D communications comprises the steps of: transmitting, to a second terminal, scheduling assignment (SA) information for scheduling D2D data; and transmitting the D2D data to the second terminal according to the SA information, wherein the D2D data are repeatedly transmitted by the first terminal, and the first terminal may request the second terminal to perform, together with the first terminal, repeated transmissions of the D2D data in a single frequency network (SFN) manner on the same time-frequency resource.