Base Station Power Control for EVM and Coverage Trade-off
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Solution Overview
Problem
In wireless communication systems, reducing Error Vector Magnitude (EVM) to improve signal quality while maintaining base station coverage is challenging, as lower EVM increases manufacturing costs and complexity, and reducing amplifier output decreases coverage and degrades downlink signal quality.
Innovation Solution
A method and apparatus for a base station to control transmission power based on channel state information from mobile terminals, calculating the Modulation order Product code Rate (MPR) and adjusting power levels using a Carrier to Interference Noise Ratio (CINR) estimation to maintain EVM compliance and downlink channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the amplifier output is reduced to improve EVM and signal quality, then the EVM decreases and signal quality improves, but the base station coverage area reduces and downlink signal quality degrades
Solution Approach 1:
The patent implements dynamic power adjustment by continuously monitoring downlink channel quality metrics (RSRP, SINR, block error rate) and adapting transmission power in real-time. The base station transitions from static power operation to dynamic power control, adjusting power levels based on current channel conditions to maintain coverage while improving EVM.
Solution Approach 2:
The patent changes the operating parameters of the amplifier by adjusting transmission power levels based on channel quality measurements. By modifying power parameters dynamically rather than operating at fixed levels, the system achieves improved EVM while maintaining adequate coverage through adaptive parameter adjustment.
2Manufacturing precision
If the amplifier output is reduced to improve EVM, then the EVM decreases, but the downlink channel quality degrades
Solution Approach 1:
The patent implements a feedback mechanism where the base station monitors downlink channel quality metrics including reference signal received power (RSRP), signal-to-interference-plus-noise ratio (SINR), and block error rate. This feedback information is used to dynamically adjust transmission power, ensuring that EVM improvement does not compromise downlink channel quality.
Solution Approach 2:
The system performs self-adjustment by automatically monitoring its own transmission quality and adjusting power levels based on measured performance. The base station uses its own measurements of channel quality and error rates to control its transmission power, eliminating the need for external intervention while maintaining both EVM and channel quality.
3Manufacturing precision
If transmission power is reduced to improve EVM compliance, then EVM requirements are met, but base station coverage area shrinks
Solution Approach 1:
The patent enables the coverage area to be dynamic rather than fixed by implementing continuous power adjustment based on spatial distribution of user terminals. Different regions receive different power levels according to their channel conditions, allowing the effective coverage area to adapt and maintain service quality across varying geographic areas.
Solution Approach 2:
The patent applies different transmission power levels to different spatial locations and user terminals based on their specific channel conditions. Instead of uniform power transmission, the system optimizes power distribution locally for each user or region, maintaining EVM compliance while extending effective coverage to areas with better channel conditions.
Data Source
AI summary
A base station in a wireless communication system and a method for controlling power by the same are provided. The method includes receiving channel state information from a mobile terminal, calculating information regarding a Modulation order Product code Rate (MPR) of the mobile terminal using the channel state information, and controlling transmission power for the mobile terminal according to the information regarding the MPR.