D2D Power Control for Cellular Interference Management
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Solution Overview
Problem
Existing device-to-device (D2D) communication systems face challenges in ensuring quality of service (QoS) due to interference issues, leading to degraded performance and data transmission efficiency when coexisting with cellular communication, as the cellular user equipment must balance transmission power to manage interference effectively.
Innovation Solution
A power control method that involves receiving channel information from a base station, estimating uplink channels, and selecting transmission power based on channel gain values to ensure maximum transmission efficiency while minimizing interference, using techniques like single user decoding (SUD) and successive interference cancellation (SIC) to optimize data transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cellular user equipment increases transmission power to improve data transmission efficiency, then the transmission efficiency is improved, but the interference intensity on D2D receiving user equipment increases degrading its performance
Solution Approach 1:
The patent dynamically adjusts the transmission power parameter of cellular user equipment based on channel conditions and QoS requirements. By changing the power parameter adaptively rather than using fixed power levels, the system achieves both improved transmission efficiency and controlled interference to D2D communications.
Solution Approach 2:
The patent implements a feedback mechanism where the base station monitors channel state information, interference levels, and QoS metrics, then provides power control commands to cellular user equipment. This closed-loop feedback system enables real-time optimization of transmission power to balance efficiency and interference management.
2Object-affected harmful factors
If the cellular user equipment lowers transmission power to reduce interference on D2D receiving user equipment, then the interference is reduced improving D2D performance, but the data transmission efficiency of cellular user equipment decreases
Solution Approach 1:
The patent dynamically adjusts the transmission power parameter of cellular user equipment based on channel conditions and QoS requirements. By changing the power parameter adaptively rather than using fixed power levels, the system achieves both improved transmission efficiency and controlled interference to D2D communications.
Solution Approach 2:
The patent transitions from static power control to dynamic power adjustment. The transmission power is continuously adapted based on real-time channel state information, interference measurements, and QoS requirements, allowing the system to respond to changing conditions and optimize both cellular efficiency and D2D performance.
3Device complexity
If the D2D receiving user equipment uses single user decoding scheme to simplify reception, then the device complexity is reduced, but the performance is degraded due to increased interference sensitivity
Solution Approach 1:
The patent introduces the base station as an intermediary that provides channel state information and coordination between cellular and D2D users. This intermediary enables the simple SUD scheme at the D2D receiver to achieve better performance by having external assistance for interference management rather than requiring complex local processing.
Data Source
AI summary
Disclosed is a method of controlling, by a device, power for guaranteeing the quality of service of a device to device (D2D) direct communication. In detail, the method comprises the steps of: receiving, from a base station, information containing at least one of channel information and information of a receiving side device in a D2D communication; estimating an uplink channel with the base station on the basis of the received information; and selecting a transmission power by comparing the channel gain value of the uplink channel with a threshold value for determining the maximum transmission power, and transmitting data to the base station using the selected transmission power, wherein the channel information comprises at least one of channel information of the D2D communication, uplink channel information between the device and the base station, and interference channel information between the device and the receiving side device in the D2D communication.