Femto Node Transmit Power Control for Interference Management
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Solution Overview
Problem
Femto base stations in wireless communication systems cause interference due to unplanned deployments, leading to inefficiencies in RF coverage and network performance, particularly in indoor environments where coverage is not optimized by mobile operators.
Innovation Solution
Adaptive transmit power management based on channel quality, where access nodes, such as femto nodes, adjust their power levels based on received signal strength, channel conditions, and interference feedback to minimize interference and optimize coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If femto base stations are deployed in an ad-hoc manner by subscribers, then ease of installation and deployment is improved, but interference management and network performance deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where access terminals measure downlink channel quality and report uplink interference levels to the femto base station. The femto base station uses this feedback to dynamically adjust its transmit power, creating a closed-loop system that automatically manages interference while maintaining ease of deployment.
Solution Approach 2:
The patent introduces dynamic transmit power adjustment where the femto base station continuously adapts its power level based on real-time channel conditions and interference measurements. This dynamic behavior allows the system to maintain optimal performance without requiring manual configuration or operator intervention.
2Area of stationary object
If femto base stations transmit at high power to ensure coverage, then coverage area is improved, but interference to macro cells and other femto cells increases
Solution Approach 1:
The patent implements dynamic transmit power control where the femto base station adjusts its power level in real-time based on measured interference conditions and channel quality. This allows the system to expand coverage when conditions permit while automatically reducing power when interference becomes problematic, resolving the contradiction between coverage area and interference generation.
Solution Approach 2:
The patent changes the transmit power parameter dynamically based on environmental conditions. The femto base station monitors downlink channel quality indicators and uplink interference levels, then adjusts its transmit power parameter accordingly to maintain coverage while minimizing interference to macro cells and neighboring femto cells.
3Productivity
If femto base stations are deployed without operator optimization, then deployment flexibility and speed are improved, but RF coverage optimization and network performance deteriorate
Solution Approach 1:
The patent enables femto base stations to self-configure and self-optimize their transmit power without operator intervention. The system automatically measures channel conditions, evaluates interference levels, and adjusts power parameters autonomously, allowing rapid deployment while maintaining reliable network performance through automated optimization.
Solution Approach 2:
The patent implements automated feedback loops where the femto base station continuously monitors network conditions and adjusts its operation accordingly. This self-optimizing behavior compensates for the lack of operator configuration, maintaining network performance reliability while enabling fast, flexible deployment.
Data Source
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AI summary
A method of wireless communication, comprising: determining channel quality; and determining a transmit power value based on the determined channel quality, wherein the transmit power value is determined for a pico node.