Pico Cell Spectrum Selection in Heterogeneous Wireless Networks
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Solution Overview
Problem
The increasing number of users in wireless communication networks leads to performance issues due to increased wireless traffic, which is exacerbated by interference in heterogeneous networks where macro cells are divided into pico cells using licensed and unlicensed frequency bands.
Innovation Solution
The implementation of a method where access points in pico cells dynamically select and switch between licensed and unlicensed frequency spectra for signal transmission, allowing for channel or spectrum changes to maintain quality of service by informing user devices or handing them off to macro cell base stations as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If access points use licensed frequency bands for communication in pico cells, then quality of service is maintained through reliable licensed spectrum, but interference increases and performance deteriorates due to congestion from increased users and traffic
Solution Approach 1:
The access point dynamically selects between licensed and unlicensed frequency bands based on real-time conditions. The system monitors interference levels and traffic patterns, then adaptively switches spectrum types to optimize performance. This dynamic approach allows the network to respond to changing conditions rather than being static in its spectrum usage.
Solution Approach 2:
The system changes the fundamental parameter of frequency band selection, transitioning between licensed and unlicensed spectra based on network conditions. When licensed bands become congested or interfere with macro cell operations, the access point switches to unlicensed bands (such as 5 GHz or 60 GHz), effectively changing the operational parameters to maintain quality of service while reducing harmful interference.
2Productivity
If heterogeneous networks divide macro cells into pico cells with access points, then network capacity increases to handle more users, but interference increases due to shared licensed spectrum between macro and pico cells
Solution Approach 1:
The system segments the spectrum usage by function and location. Macro cells use licensed bands for broad coverage, while pico cells can dynamically access both licensed and unlicensed bands. This segmentation allows the network to handle more users through additional access points while reducing interference through intelligent spectrum allocation and dynamic selection of unlicensed bands when licensed bands are congested.
Solution Approach 2:
The invention adds a new dimension to spectrum usage by introducing unlicensed frequency bands as an additional resource layer. Instead of only using licensed bands vertically, the system horizontally expands into unlicensed spectrum (5 GHz, 60 GHz), creating a multi-dimensional spectrum allocation strategy that increases capacity while managing interference through diverse frequency access.
3Reliability
If access points continuously monitor and switch between licensed and unlicensed spectrums, then interference is reduced and quality of service is improved, but device complexity increases due to spectrum selection mechanisms
Solution Approach 1:
The access point implements a feedback-driven spectrum selection mechanism that monitors key parameters such as interference levels, signal quality, and traffic patterns. Based on this feedback, the system automatically adjusts spectrum usage decisions. This feedback loop simplifies the complexity by using rule-based decision making rather than complex algorithms, allowing dynamic adaptation while maintaining manageable device complexity.
Data Source
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AI summary
A method of managing signals within a wireless network that comprises at least one macro cell, wherein the macro cell comprises at least one base station and a plurality of pico cells, and wherein each pico cell comprises an access point in communication with the at least one base station. The method includes selecting a spectrum to use for transmission of signals within a corresponding pico cell, wherein the spectrum that is selected is one of (i) a spectrum licensed for wireless communication, and (ii) a spectrum that is unlicensed. Signals within the corresponding are then transmitted and received over the selected spectrum.