Cell Search Method for D2D Interference Mitigation in Wireless Systems
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Solution Overview
Problem
Device-to-Device (D2D) operations in wireless communication systems can cause interference with cellular communication, particularly when using the same or different frequencies, as D2D signal transmission may disrupt cellular communication between base stations and terminals, necessitating a method to minimize this interference.
Innovation Solution
A cell searching method where a user equipment (UE) determines the presence of a downlink frequency associated with a preconfigured resource for D2D operations and searches for a cell at that frequency, allowing the UE to perform D2D operations based on D2D configuration information provided by the cell, thereby minimizing interference by aligning with cellular communication frequencies and schedules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal performs D2D signal transmission in a specific frequency band, then direct communication between devices is enabled, but interference to cellular communication occurs
Solution Approach 1:
The terminal performs cell searching and determines cell presence in the downlink frequency band before initiating D2D signal transmission. This preliminary action ensures that D2D operations are only performed when no cellular communication is actively using the frequency, thereby preventing interference while enabling D2D communication capability
Solution Approach 2:
The downlink frequency band determination acts as an intermediary check between the D2D transmission request and the actual transmission. By introducing this intermediate verification step, the system ensures that D2D operations do not conflict with cellular communication, resolving the interference issue while maintaining D2D functionality
2Adaptability or versatility
If the terminal uses preconfigured resources for D2D operation outside cell coverage, then D2D operation can be performed without base station scheduling, but frequency conflict with cellular communication may occur
Solution Approach 1:
The terminal provides feedback by determining whether a cell is present in the downlink frequency band associated with the preconfigured D2D resources. Based on this feedback, the terminal decides whether to proceed with D2D transmission, thereby adapting D2D operation flexibility while preventing frequency interference with cellular communication
Solution Approach 2:
The system changes the operational parameter by conditionally enabling or disabling D2D transmission based on cell presence detection. When a cell is detected in the associated downlink frequency, D2D transmission is prevented; when no cell is present, D2D transmission is allowed, thus resolving the frequency conflict while maintaining operational versatility
Data Source
AI summary
Provided is a cell searching method performed by a terminal in a wireless communication system, and a terminal using same. In the method, determined is whether or not a downlink frequency exists, the downlink frequency being associated with a frequency having preconfigured resources for a D2D operation, and, if the downlink frequency exists, a search is performed for a cell in the downlink frequency.