Cell Group Transmission Power Time Pattern Control
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Solution Overview
Problem
In mobile communication systems where multiple cells use the same frequency band, inter-cell interference reduces the quality of reception signals at cell boundaries, and methods to restrict resource allocation in adjacent cells either deteriorate throughput or limit communication quality improvements.
Innovation Solution
A control apparatus that determines a time pattern of transmission power for cell groups, notifying radio stations to switch their transmission power, allowing radio terminals to change their connected cell and avoid being consistently at the cell edge, thereby improving throughput without degrading performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of radio resource restricted from allocation in adjacent cells is increased to improve communication quality of cell boundary terminals, then communication quality is improved, but throughput of radio terminals in adjacent cells deteriorates
Solution Approach 1:
The patent applies periodic action by having radio stations cyclically switch transmission power between different levels (e.g., first power level and second power level) according to a predetermined time pattern. This periodic switching creates time-varying interference patterns that allow cell boundary terminals to periodically experience improved signal conditions, thereby improving communication quality without permanently restricting resource allocation that would harm throughput.
Solution Approach 2:
The patent implements dynamics by making the transmission power level changeable over time rather than static. The control apparatus dynamically adjusts the transmission power pattern based on the time of day or other conditions, allowing the system to adapt between improving communication quality and maintaining throughput depending on current network conditions and traffic demands.
2Reliability
If transmission power is continuously reduced in adjacent cells to improve communication quality, then communication quality improves, but system capacity and throughput deteriorate
Solution Approach 1:
Instead of continuously reducing transmission power, the patent uses periodic action by switching between different power levels according to a time pattern. During certain time periods, transmission power is reduced to improve communication quality for cell boundary terminals, while during other periods, normal power levels are maintained to preserve system capacity and throughput, thus achieving both goals without permanent sacrifice.
Solution Approach 2:
The control apparatus determines and notifies the time pattern of transmission power in advance to radio stations. This preliminary action allows radio terminals to anticipate changes in transmission power and adjust their reception parameters accordingly, ensuring smooth transitions and minimizing interference during power switching, thereby maintaining both communication quality and system capacity.
Data Source
AI summary
Provided is a control apparatus that can improve throughput of a cell edge user while preventing the throughput of the cell edge user. A control apparatus (10) according to the present invention is disposed in a radio system including communication areas formed by a plurality of cells using the same frequency band. The control apparatus (10) includes a pattern determining unit (110) for defining a cell group including one or more cells formed by radio stations (1) to (6) and determining a time pattern of transmission power to be set for each of a plurality of the cell groups and a communication unit (120) for notifying the radio stations (1) to (6) that form the cells included in the cell group of the time patterns of the transmission power and timing signals indicating switching timings of the transmission power in the radio stations (1) to (6).