Dynamic Power Allocation for MIMO Base Stations
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Solution Overview
Problem
In wireless MIMO systems with large antenna arrays, the performance is hindered by additive noise and inter-cell interference due to contamination of downlink signals, making it difficult to increase data transmission rates effectively.
Innovation Solution
A method for dynamically allocating transmit power at base stations to active user equipment, using a controller to determine and adjust power levels for each downlink signal, minimizing interference while ensuring sufficient signal strength, by maximizing the Signal to Interference Ratio (SIR) for a percentage of user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of antennas at base station is increased, then the system performance improves and additive noise impact decreases, but inter-cell interference increases due to pilot signal contamination
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmit power levels of downlink signals based on channel conditions and interference levels. The base station modifies power parameters for different user equipment to optimize the signal-to-interference ratio, thereby maintaining system performance while reducing inter-cell interference impact.
Solution Approach 2:
The patent implements dynamics through adaptive power allocation that continuously adjusts transmit power levels in response to changing channel conditions and interference environments. The system transitions from static power allocation to dynamic control, allowing real-time optimization of downlink signal powers to mitigate inter-cell interference while maintaining reliable communication.
2Productivity
If downlink signals are transmitted with high power to improve data rates, then transmission rate increases, but inter-cell interference increases due to pilot signal contamination
Solution Approach 1:
The patent applies local quality by assigning different power levels to downlink signals intended for different user equipment within the same cell. Instead of uniform power allocation, the system tailors power levels locally to each user's channel conditions and interference environment, optimizing data rates while minimizing interference contribution to other cells.
Solution Approach 2:
The patent changes power parameters dynamically based on channel state information and interference measurements. By adjusting transmit power levels as control parameters, the system achieves higher data transmission rates for individual users while controlling the overall interference level contributed to neighboring cells.
3Ease of operation
If equal power is allocated to all user equipment, then implementation is simple, but signal-to-interference ratio is not optimized
Solution Approach 1:
The patent transitions from static equal power allocation to dynamic adaptive power allocation. The system continuously adjusts power levels based on real-time channel conditions and interference measurements, optimizing the signal-to-interference ratio for each user while maintaining manageable operational complexity through automated control algorithms.
Solution Approach 2:
The patent implements feedback mechanisms where the base station receives channel state information and interference measurements from user equipment, then adjusts power allocation accordingly. This closed-loop control optimizes the signal-to-interference ratio while keeping the system operationally simple through automated decision-making based on measured conditions.
Data Source
AI summary
Provided is a method and apparatus for allocating transmit power in a wireless network. The method includes determining powers at which a base station transmits downlink signals to each active user equipment associated with the base station such that each of the downlink signals is associated with a different active user and the base station is permitted to transmit downlink signals with different powers to the associated active user equipments. The method further includes transmitting the associated downlink signals, by the base station, to the active user equipments at the determined powers.