D2D Discovery Signal Interference Control via Base Station Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In mobile communication systems, D2D communication interferes with cellular communication, leading to a deterioration of communication quality due to the lack of network intervention in D2D data paths, causing interference issues.
Innovation Solution
A communication control method where a base station transmits radio resource information to user terminals, allowing them to manage and adjust transmission power based on received signal intensity, thereby reducing interference by controlling the transmission power of discovery-use signals and D2D communication signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If D2D communication is performed in a licensed band, then direct communication between user terminals is enabled without network intervention, but interference with cellular communication occurs and communication quality deteriorates
Solution Approach 1:
The base station receives feedback information from user terminals regarding received signal intensity of D2D signals. Based on this feedback, the base station dynamically adjusts transmission power control parameters and provides them back to the user terminals, creating a closed-loop feedback mechanism that suppresses interference while maintaining D2D communication functionality
Solution Approach 2:
The system dynamically changes transmission power parameters based on feedback from user terminals. The base station adjusts transmission power control parameters (such as maximum transmission power or power offset) according to the received signal intensity feedback, thereby adapting the D2D transmission parameters to minimize interference with cellular communication
2Reliability
If transmission power of D2D signals is increased, then communication reliability between user terminals improves, but interference with cellular communication increases
Solution Approach 1:
The transmission power control parameters are made dynamic rather than static. The base station continuously receives feedback about received signal intensity and adjusts the transmission power control parameters in real-time, allowing the system to optimize the balance between D2D communication reliability and interference generation under varying channel conditions
Solution Approach 2:
A feedback mechanism is established where user terminals report received signal intensity to the base station. This feedback enables the base station to determine appropriate transmission power control parameters that ensure sufficient D2D communication reliability while preventing excessive interference to cellular users
Data Source
AI summary
A communication control method is used in a mobile communication system that supports cellular communication in which a data path passes through a core network, and D2D communication that is direct device-to-device communication in which a data path does not pass through the core network. The communication control method comprises: a transmission step of transmitting, by a first user terminal that camps on a cell of a first base station, a discovery-use signal related to the discovery of a proximal terminal be capable of a communication partner of the D2D communication; and a notification step of notifying, by a communication device, the first base station of interference information related to the received discovery-use signal in response to the communication device receiving the discovery-use signal.