Dynamic Frequency Assignment for Low-Power Base Stations

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Solution Overview

Problem

In wireless communication systems, the increasing number of low-power Base Stations (BSs) requires a method for dynamic frequency assignment to minimize interference between indoor and outdoor BSs, while adapting to changing environments and optimizing network capacity.

Innovation Solution

A method and apparatus for dynamic frequency assignment in a wireless communication system, where a BS management server receives RSSI and received power measurements from newly installed low-power BSs, selects frequencies with minimal interference, and adjusts assignments to minimize overall interference and maximize system capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the number of low-power BSs is increased to improve network coverage and capacity, then network capacity and coverage are improved, but interference between indoor and outdoor BSs increases

Engineering Contradiction:

Improvenetwork capacityVSAvoidinterference between BSs

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent dynamically changes the frequency assignment parameter for low-power BSs based on measured RSSI values. By selecting frequencies with minimum RSSI from the available FA set, the system adapts frequency parameters to minimize interference while maintaining network capacity expansion.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If dynamic frequency assignment is implemented to minimize interference, then interference between BSs is reduced, but system complexity increases

Engineering Contradiction:

Improveinterference between BSsVSAvoidfrequency assignment system complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The low-power BS autonomously measures RSSI for all available frequencies, identifies the frequency with minimum RSSI, and self-assigns this frequency without requiring complex centralized coordination. This self-service approach reduces system complexity while achieving interference minimization.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system uses RSSI measurement feedback to dynamically select frequencies. The low-power BS continuously monitors received signal strength on available frequencies and uses this feedback to make informed frequency selection decisions, simplifying the overall assignment mechanism.

Inventive Principle:

Principle #23Feedback

3Reliability

If frequency assignment is optimized for indoor BSs, then indoor BS performance is improved, but outdoor BS operation may be affected

Engineering Contradiction:

Improveindoor BS operationVSAvoidimpact on outdoor BS

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies different frequency assignment strategies tailored to indoor BS characteristics. By measuring RSSI specifically for frequencies used by outdoor BSs and selecting minimum RSSI frequencies, the system optimizes indoor BS performance while locally adapting to avoid impacting outdoor BS operations.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8880057B2Apparatus and method for dynamic frequency assignment in a wireless communication system

Publication Date: 2014.11.04 SAMSUNG ELECTRONICS CO LTD

AI summary

An apparatus and method for dynamic frequency assignment to a low-power Base Station (BS) in a wireless communication system are provided. The method includes receiving a Received Signal Strength Indication (RSSI) measurement result for the whole Frequency Assignment (FA) and an available FA set of the BS from the BS newly entering a network, selecting an FA having a minimum RSSI among FAs included in the available FA set, and assigning the FA having the minimum RSSI to the BS.