Load-Based Uplink Power Control for Heterogeneous Network Interference
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Solution Overview
Problem
Current uplink and downlink power control methods in wireless communication networks, such as LTE, do not effectively consider the interference from neighboring cells, leading to inefficient power usage and increased interference, particularly in heterogeneous networks where different cell types and user densities vary significantly.
Innovation Solution
A method and apparatus that determine the load relationship between a serving wireless access point and neighboring access points to adjust uplink or downlink transmission power, minimizing interference and optimizing power usage by considering the load balance across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pathloss-based power control is used to compensate for channel losses, then uplink coverage and signal quality are improved, but interference to neighboring cells increases
Solution Approach 1:
The patent changes the power control parameter from pathloss-based compensation to load-based adjustment. The base station determines uplink power based on the load relationship between serving and neighboring cells, dynamically adjusting the power parameter to balance coverage requirements with interference mitigation in heterogeneous network scenarios
Solution Approach 2:
The patent implements a feedback mechanism where the base station receives load information from neighboring cells and adjusts uplink power control parameters accordingly. This closed-loop feedback enables the system to adapt power levels based on real-time network conditions, reducing interference while maintaining coverage
2Reliability
If transmit power is increased to maintain QoS in heterogeneous networks, then service quality is improved, but power consumption and interference increase
Solution Approach 1:
The patent dynamically changes power control parameters based on load relationships rather than using fixed pathloss compensation. By adjusting the uplink power parameter according to neighboring cell load conditions, the system achieves QoS requirements while optimizing power consumption and reducing unnecessary interference in heterogeneous networks
Solution Approach 2:
The patent transforms static power control into a dynamic system that adapts to changing network conditions. The uplink power is continuously adjusted based on real-time load information from serving and neighboring cells, enabling the system to respond to heterogeneous network conditions and optimize both QoS and power efficiency
3Reliability
If fractional path-loss compensation with α<1 is used to control interference, then cell-edge data rate is improved, but uplink capacity for other users decreases
Solution Approach 1:
The patent replaces the fixed fractional path-loss compensation parameter α with dynamic load-based power control. Instead of applying a constant reduction factor to pathloss compensation, the system adjusts uplink power based on the load relationship between serving and neighboring cells, enabling flexible trade-offs between cell-edge performance and overall uplink capacity
Solution Approach 2:
The patent makes the power control system dynamic by continuously adapting uplink power levels to current load conditions. This dynamic adjustment allows the system to optimize cell-edge data rates when needed while preserving uplink capacity for other users, unlike static fractional compensation which always applies the same reduction
Data Source
AI summary
An apparatus and a method for uplink and/or downlink power control in a radio communication network are provided. The method comprises determining (120) a relationship between a load of a serving wireless access point and a load of at least one neighboring wireless access point; and determining (130) an uplink or downlink transmission power based on the determined load relationship.