Radio Base Station Load Balancing via Selective Information Exchange
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Solution Overview
Problem
In LTE radio communication systems, exchanging all four classes of load information between radio base stations leads to congestion in transmission paths, while exchanging only one class makes it difficult to balance loads appropriately between base stations effectively.
Innovation Solution
A radio base station system that selectively transmits first load information of smaller amount and requests second load information of larger amount only when necessary, allowing for balanced load adjustments between base stations while minimizing the amount of information exchanged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all four classes of load information are exchanged between radio base stations, then load balancing accuracy is improved, but transmission path congestion occurs
Solution Approach 1:
The load information exchange process is segmented into two stages: first exchanging small-sized first load information (hardware load indicator) with all neighboring base stations, then selectively exchanging large-sized second load information (radio resource status, composite available capacity) only with base stations that have significantly different load levels. This segmentation resolves the contradiction by dividing the information exchange into mandatory minimal exchanges and optional detailed exchanges.
Solution Approach 2:
Instead of exchanging all four classes of load information in every case, the system performs partial action by exchanging only the essential first load information universally, and adds second load information exchange only when necessary (when load difference exceeds threshold). This partial action approach maintains load balancing accuracy while minimizing overall information traffic.
2Quantity of substance
If only one class of load information is exchanged, then transmission path congestion is avoided, but load balancing accuracy deteriorates
Solution Approach 1:
The system dynamically adjusts the amount of load information exchanged based on the actual load conditions. When the absolute difference between own base station's load level and neighboring base station's load level (indicated by first load information) is not more than a predetermined threshold, only first load information is exchanged. When the difference exceeds the threshold, second load information is also exchanged. This dynamic adjustment resolves the contradiction by adapting information exchange volume to actual balancing needs.
Data Source
AI summary
A radio base station (eNB1), which is used in a radio communication system that can autonomously adjust, based on load information transmitted/received between radio base stations, the radio base station parameters used for defining coverage, comprises: a network communication unit (140) that can receive, from another radio base station, first load information indicating the load level of the other radio base station and that can transmit, to the other radio base station, a request for transmission of second load information the information amount of which is greater than that of the first load information; and a control unit (120) that, when the load level of the other radio base station indicated by the received first load information satisfies a given condition, controls such that the request for transmission of the second load information is transmitted to the other radio base station.