D2D Discovery Signal Power Control for Interference Management
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Solution Overview
Problem
In wireless mobile communication systems, device-to-device (D2D) communication causes in-band emission power noise that interferes with cellular transmission, degrading system performance, especially when D2D and cellular communications coexist.
Innovation Solution
A method and apparatus that configure power offsets for D2D discovery signals to minimize interference by determining optimal transmit power based on the position of transmission resources and configuration information, using techniques like time-division multiplexing and power offset adjustments to manage in-band emission power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D UEs transmit data using randomly selected transmit power, then D2D communication efficiency is improved, but in-band emission power causes noise to other UEs and degrades system performance
Solution Approach 1:
The patent applies parameter changes by adjusting the transmit power level of D2D UEs based on their distance to the base station. Instead of using random transmit power, the system modifies the power parameter dynamically: UEs closer to the base station use lower transmit power while those farther away use higher power, thereby reducing in-band emission noise while maintaining communication efficiency
Solution Approach 2:
The system implements feedback mechanisms where the base station receives information about D2D UE locations and adjusts transmit power assignments accordingly. The base station provides feedback to D2D UEs about appropriate power levels, creating a closed-loop control system that optimizes both communication efficiency and noise reduction
2Productivity
If D2D communication and cellular communication share the same radio resources, then radio resource utilization is improved, but interference between D2D and cellular transmissions increases
Solution Approach 1:
The patent applies local quality by differentiating resource allocation and power control strategies for different spatial locations. D2D UEs in different geographic locations relative to the base station are assigned different transmit power levels and resource configurations, allowing efficient resource utilization while minimizing localized interference with cellular transmissions
Solution Approach 2:
The system segments the D2D communication resources based on UE location and interference conditions. By dividing the resource space into different power levels and time-frequency slots for different UEs, the system achieves better resource utilization while reducing interference through structured segmentation
Data Source
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AI summary
Provided is a method of signal transmission and reception for a user equipment (UE) in a mobile communication system. The method may include: receiving configuration information for discovery signals from a base station (ENB); determining a transmission resource for a discovery signal on the basis of the received configuration information; and sending a discovery signal utilizing a transmit power determined based on the position of the transmission resource and the configuration information. Accordingly, it is possible to reduce interference effects caused by UEs transmitting a signal and improve communication performance in a mobile communication system.