4G Base Station Frequency Selection via SON Iterative Optimization
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Solution Overview
Problem
Existing methods for automated base station frequency selection in wireless networks fail to consider throughput per unit area, leading to inefficient frequency reuse and interference issues due to the 'hidden base station' problem, where base stations choose the same frequency without accounting for the actual throughput and surface area served.
Innovation Solution
An iterative simulation approach is used by a centralized Self-Organizing Network (SON) server to calculate and optimize the frequency selection for new base stations based on real-world measurements and nominal specifications, focusing on maximizing throughput per unit area (AreaT) by analyzing signal strengths and interference, thereby selecting the optimal frequency for each base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If base stations perform passive RSSI measurements simultaneously to solve the hidden base station problem, then interference between visible base stations is reduced, but the complexity of coordination and timing increases significantly
Solution Approach 1:
The patent applies preliminary action by having base stations perform frequency selection in predetermined time slots before actual operation begins. The network controller assigns specific time slots to different base stations for their measurements and selections, ensuring that frequency decisions are made in advance according to a pre-established schedule. This prevents simultaneous measurements and eliminates the need for complex real-time coordination during operation.
2Productivity
If automated frequency selection is implemented to reduce maintenance costs, then operational efficiency improves, but the accuracy of frequency selection decreases due to hidden base station problems
Solution Approach 1:
The patent introduces a network controller as an intermediary that collects RSSI measurements from all base stations and coordinates their frequency selection processes. This intermediary entity has a global view of the network state and can make informed decisions about frequency assignments, resolving the hidden base station problem by considering measurements from all stations rather than relying on individual autonomous decisions.
Solution Approach 2:
The system performs frequency selection in advance during predetermined time slots before the base stations begin their normal operations. This preliminary frequency assignment ensures that interference patterns are accounted for before stations become active, improving selection accuracy while maintaining automated efficiency.
3Extent of automation
If base stations select frequencies independently based on local RSSI measurements, then automation is maximized, but frequency reuse efficiency decreases due to hidden base station interference
Solution Approach 1:
The patent implements preliminary frequency selection in predetermined time slots before base stations become operational. This advance planning allows the system to maximize automation while improving frequency reuse efficiency, as the network controller can optimize frequency assignments based on complete network information before stations begin transmitting.
Solution Approach 2:
The network controller serves as an intermediary that maintains high automation by algorithmically determining optimal frequency assignments based on collected RSSI data, while simultaneously improving frequency reuse efficiency through coordinated frequency selection that prevents hidden base station interference.
Data Source
AI summary
A method for 4G node frequency selection describes a mechanism for automatically selecting the frequency of a newly installed base station, thereby optimizing the throughput per area unit of the newly installed base station in its predefined vicinity area. The method is based on an iterative calculation approach which combines real-world network and base station measurements information with the nominal specifications of the newly installed base station (antenna diagram, output power) and the location and direction thereof.