Wireless Relay Power Control for Interference Mitigation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current wireless relay networks lack effective power control mechanisms, leading to inefficiencies in transmission power levels and interference between relay stations, which affects network coverage and throughput.

Innovation Solution

The implementation of a system that receives neighbor measurement reports from relay stations to determine maximum transmission power levels and mobile station-specific downlink data transmission power levels, based on channel quality reports, to optimize power usage and reduce interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If transmission power levels are increased to improve network coverage, then coverage area is improved, but interference between relay stations increases

Engineering Contradiction:

Improvenetwork coverage areaVSAvoidinterference between relay stations

Core Design Contradiction:

Area of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent dynamically adjusts transmission power levels as a controllable parameter based on channel quality measurements. The base station receives measurement reports from relay stations and mobile stations, then determines optimal power levels that adapt to changing network conditions, resolving the contradiction between coverage area and interference by finding the right power parameter setting for each scenario

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements a feedback mechanism where relay stations and mobile stations continuously measure channel quality and report back to the base station. The base station uses this feedback information to adjust transmission power levels, creating a closed-loop control system that balances coverage expansion with interference mitigation through iterative optimization

Inventive Principle:

Principle #23Feedback

2Reliability

If transmission power levels are increased to ensure sufficient signal strength, then signal quality is improved, but power consumption increases

Engineering Contradiction:

Improvesignal strengthVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent optimizes the power consumption parameter by dynamically adjusting transmission power levels based on actual channel quality measurements. Instead of using fixed high power levels, the system adapts the power parameter to match the minimum required for reliable communication, thereby reducing unnecessary energy consumption while maintaining signal strength reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies the principle of partial action by transmitting at the minimum necessary power level rather than using excessive power. The base station determines power levels that are sufficient to achieve reliable communication based on measurement reports, avoiding the waste of energy that would occur with consistently high power transmission

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS8270908B2Power control and channel reuse techniques for wireless relay networks

Publication Date: 2012.09.18 NOKIA TECHNOLOGIES OY

AI summary

Various example embodiments are disclosed relating to relay networks or multi-hop networks, and also relating to power control and channel reuse techniques for wireless relay networks. A technique of power control in a wireless relay network may include receiving a channel measurement report via a relay station from a mobile station attached to the relay station, and determining a mobile station-specific downlink data transmission power level for the relay station to transmit data to the mobile station based at least in part on the received channel measurement report from the mobile station.