Base Station Transmit Power Adjustment for Inter-Cell Interference
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Solution Overview
Problem
Current wireless communication systems fail to adjust transmit power in real-time effectively to enhance the signal-to-interference plus noise ratio (SINR) of user equipment (UE) in inter-cell interference environments, leading to suboptimal network performance due to variations in channel state and network loading.
Innovation Solution
A method and device that predict inter-cell interference and determine optimal transmit power for each base station based on real-time channel state and network load, adjusting power to maximize the sum of SINR for both serving and neighboring cells, while setting lower and upper limits to prevent communication outages and excessive overlapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If long-term transmit power adjustment is used based on statistical information, then coverage optimization is achieved, but real-time SINR enhancement is insufficient when channel state and network loading vary
Solution Approach 1:
The patent transitions from static long-term transmit power adjustment to dynamic real-time adjustme nt. Each base station continuously monitors its own SINR and neighboring base stations' SINR, and adjusts its transmit power dynamically based on real-time channel state and network loading conditions, enabling the system to adapt to varying RF characteristics as UEs move
Solution Approach 2:
The patent implements a feedback mechanism where each base station measures its own SINR and the SINR of neighboring base stations, then uses this feedback information to adjust its transmit power. The base station receives SINR measurements from UEs and uses this feedback to determine optimal power levels that maximize overall system SINR
2Device complexity
If homogeneous base stations transmit data in the same transmit power, then system simplicity is maintained, but network performance deteriorates due to uneven data traffic distribution and varying RF characteristics
Solution Approach 1:
The patent applies local quality by allowing each base station to have different transmit power levels tailored to its local conditions. Each base station independently determines its optimal transmit power based on its own SINR measurements and neighboring base station SINR measurements, enabling localized optimization without requiring complex centralized control
Solution Approach 2:
Each base station autonomously adjusts its own transmit power based on measurements it collects from its served UEs and SINR information about neighboring base stations. The system enables self-service by allowing base stations to independently make power adjustment decisions without requiring complex centralized coordination, thereby maintaining relative system simplicity while achieving performance improvement
3Area of stationary object
If transmit power is increased to enhance signal strength, then coverage is improved, but inter-cell interference increases and reduces overall system SINR
Solution Approach 1:
The patent uses feedback from SINR measurements to control transmit power adjustments. Each base station monitors both its own SINR and neighboring base stations' SINR, and adjusts power only when it determines the adjustment will improve overall system performance, thereby preventing excessive interference
Solution Approach 2:
The patent dynamically changes the transmit power parameter based on measured SINR conditions. Each base station adjusts its transmit power level according to real-time channel state and network loading conditions, optimizing the balance between coverage and interference by adapting the power parameter to current system state
Data Source
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AI summary
A method for adjusting transmit power of a serving base station in a wireless communication system is provided. The method includes receiving measurement information indicating channel states of the serving base station and at least one neighbor base station from at least one serving user equipment (UE), receiving first information including information about transmit power of the at least one neighbor base station from the at least one neighbor base station, and determining the transmit power of the serving base station using the measurement information and the first information.