Base Station Power Control for Interference Management

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Solution Overview

Problem

Current communication systems face challenges in effectively controlling uplink transmission power to manage interference and improve Quality of Service (QoS) in next-generation communication systems, particularly in balancing transmission power between MSs in center and boundary areas of cell coverage, which affects signal interference and noise ratios.

Innovation Solution

A method and system where a Base Station (BS) receives noise and interference information from neighboring BSs, calculates control values for Mobile Stations (MSs) based on this information, and generates power control signals to adjust transmission power, ensuring optimal SINR and reducing interference with neighboring cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an MS located in the boundary area increases transmission power to maintain SINR with its serving BS, then the SINR for data exchange with the serving BS is maintained, but interference signals to neighboring BSs increase

Engineering Contradiction:

ImproveSINR for data exchangeVSAvoidInterference signals to neighboring BS

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by implementing location-dependent power control where MSs in boundary areas receive different power control parameters compared to MSs in center areas. The serving BS determines whether an MS is in a boundary or center area and applies appropriate power control adjustments accordingly, allowing boundary MSs to transmit at higher power when necessary while center MSs transmit at lower power to minimize interference.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamic power control where transmission power is continuously adjusted based on real-time channel conditions, MS location, and interference levels. The power control parameters are dynamically updated by the serving BS based on feedback from neighboring BSs about interference levels, allowing the system to adapt to changing conditions and optimize the balance between maintaining SINR and reducing interference.

Inventive Principle:

Principle #15Dynamics

2Reliability

If an MS located in the center area increases transmission power to improve reception quality, then QoS of transmission/reception signals is improved, but interference signals to neighboring BSs remain low

Engineering Contradiction:

ImproveQoS of transmission/reception signalsVSAvoidInterference signals to neighboring BS

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent converts the potential harm of high transmission power into benefit by using interference information from neighboring BSs to make intelligent power control decisions. When neighboring BSs report low interference levels, the serving BS can safely allow center-area MSs to increase transmission power to improve QoS, knowing that the interference impact is minimal. This transforms what could be harmful high-power transmission into a beneficial QoS improvement.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If the BS allows MSs to transmit with higher transmission power, then QoS and reception quality are improved, but interference to neighboring cells increases

Engineering Contradiction:

ImproveQoSVSAvoidInterference to neighboring cells

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent implements feedback-based power control where neighboring BSs monitor interference levels and transmit interference information back to the serving BS. The serving BS uses this feedback to adjust power control parameters for MSs in its cell. When feedback indicates high interference to neighboring cells, the serving BS reduces power control adjustments to limit further interference. When feedback shows acceptable interference levels, the serving BS can allow higher transmission powers to improve QoS.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Inventive Principle:

Principle #15Dynamics

4Object-generated harmful factors

If the BS reduces transmission power of MSs to minimize interference, then interference to neighboring cells is reduced, but Packet Error Rate increases due to insufficient signal strength

Engineering Contradiction:

ImproveInterference to neighboring cellsVSAvoidPacket Error Rate

Core Design Contradiction:

Object-generated harmful factorsVSReliability

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8023897B2Control system and method in a communication system

Publication Date: 2011.09.20 SAMSUNG ELECTRONICS CO LTD

AI summary

In a control method of a communication system, a Base Station (BS) receives noise and interference information from at least one neighboring BS in charge of a neighboring cell being adjacent to a serving cell of the BS, calculates a control value of Mobile Stations (MSs) located in the serving cell according to the received noise and interference information, and generates control information according to the calculated control value, and transmits the generated control information to the MSs.