Indoor Cellular Filter Adjusting Downlink Power by Uplink Signal Strength
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Solution Overview
Problem
Traditional power splitters in indoor cellular systems do not consider traffic load at connected antennas, leading to inefficient power distribution and waste of radio base station power, as they split power equally regardless of the number of mobile stations, resulting in suboptimal coverage and increased need for radio base stations.
Innovation Solution
A filter system that determines uplink signal strength and adjusts downlink signal power accordingly, allowing for intelligent power distribution based on traffic load, reducing the number of needed radio base stations by optimizing power usage across multiple antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional power splitters are used to distribute power equally to multiple antennas, then the system structure is simple and easy to implement, but the power distribution efficiency deteriorates because power is split independently of the number of mobile stations connected to each antenna
Solution Approach 1:
The power splitter is transformed from a static equal-power distribution device to a dynamic load-adjusting device. Each output port is equipped with an automatic load adjusting unit that continuously monitors the number of connected mobile stations and dynamically adjusts the load impedance to optimize power distribution according to actual traffic demand
Solution Approach 2:
The system implements feedback mechanisms where the automatic load adjusting units monitor the traffic load at each antenna and adjust the power distribution accordingly. The radio base station receives information about the number of connected mobile stations and adjusts the power allocation in real-time based on this feedback
2Reliability
If more radio base stations are deployed to cover all antennas with adequate power, then the coverage and service quality improve, but the system cost and complexity increase
Solution Approach 1:
The system changes the load impedance parameter at each output port of the power splitter to optimize power distribution. By adjusting the load parameter dynamically based on the number of connected mobile stations, a single radio base station can efficiently serve multiple antennas with varying traffic demands, eliminating the need for additional base stations
3Device complexity
If equal power is allocated to all antennas regardless of traffic load, then the power distribution mechanism is simple, but the overall system capacity is reduced due to wasted power in low-traffic areas
Solution Approach 1:
The power distribution system transitions from uniform power allocation to localized adaptive power allocation. Each output port of the power splitter is equipped with an automatic load adjusting unit that independently adjusts the power distribution based on the local traffic conditions (number of connected mobile stations) at that specific antenna, optimizing overall system capacity
Data Source
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AI summary
The invention relates to a filter (20) filtering a downlink signal of an antenna (13) of an indoor cellular system, the filter comprising a signal determining unit (24) determining a signal strength of an uplink signal received by said antenna (13), the filter adjusting a signal strength of the downlink signal of said antenna (13) in accordance with the signal strength of the uplink signal.