Wireless Transmission Power Control via Interference Price Coordination
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Solution Overview
Problem
In wireless networks with multiple transmitter/receiver pairs using the same frequency, interference is a significant issue that existing technologies have not adequately addressed, particularly in cellular and multi-hop sensor networks, making it difficult to simultaneously manage interference control elements like user scheduling, beamforming, and transmission power control.
Innovation Solution
A method for controlling transmission power in a multi-cell environment by generating a transmit beamforming vector to minimize power for a target base station, coordinating with neighboring base stations through information sharing, and allocating power based on interference price information to achieve preset Signal to Interference plus Noise Ratios (SINRs) and improve Quality of Service (QoS).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission power is increased to improve signal quality, then SINR is improved, but interference to neighboring cells increases
Solution Approach 1:
The patent implements feedback mechanisms where base stations exchange interference price information and channel state information with neighboring base stations. This feedback loop enables dynamic adjustment of transmission power and beamforming vectors based on actual interference conditions, allowing the system to optimize SINR while controlling interference through iterative information exchange and coordinated power control.
Solution Approach 2:
The patent changes key parameters including transmission power levels, beamforming vectors, and interference prices dynamically. By adjusting these parameters based on channel state information and interference conditions, the system optimizes the trade-off between achieving target SINR and minimizing interference to neighboring cells, rather than using fixed power levels.
2Object-generated harmful factors
If cooperative control with neighboring base stations is implemented to reduce interference, then interference is reduced, but system complexity increases
Solution Approach 1:
The patent segments the interference control problem into manageable components: individual base stations optimize their own beamforming vectors and power levels based on local channel state information, while exchanging summarized interference price information with neighbors. This segmentation allows distributed optimization without requiring centralized coordination of all system parameters, reducing overall system complexity.
Solution Approach 2:
The patent introduces interference price information as an intermediary mechanism that mediates between neighboring base stations. Instead of directly coordinating all transmission parameters, base stations use interference prices as a simplified signal to indicate interference conditions, enabling cooperative interference control through information exchange without requiring complex joint optimization of all system parameters.
3Use of energy by moving object
If beamforming vectors are optimized to minimize transmission power, then power efficiency is improved, but achieving target SINR becomes more difficult
Solution Approach 1:
The patent makes the beamforming vector optimization dynamic by iteratively updating beamforming vectors based on current channel state information and interference conditions. Rather than using fixed beamforming vectors, the system adapts beamforming directions and power levels in response to changing conditions, enabling the achievement of target SINR while minimizing required transmission power through dynamic optimization.
Data Source
AI summary
A method and apparatus for controlling transmission power in a wireless network area is provided. A target base station may control transmission power in cooperation with a neighboring base station and, thus, a satisfaction with a Quality of Service (QoS) of target terminals may be improved. Additionally, the target base station may determine whether to control the transmission power in cooperation with the neighboring base station, based on a possible improvement in satisfaction with the QoS of the target terminals.