Compact Base Station Transmit Power Control via Neighbor Signal Feedback
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Solution Overview
Problem
Compact Base Stations in wireless communication systems face challenges in adaptively controlling transmit power, especially in large buildings with many registered users and when determining whether a foreign user has moved into the area, leading to difficulties in maintaining reliable communication and minimizing interference with external systems.
Innovation Solution
The solution involves measuring and comparing signal strengths of neighbor Base Stations (BSs) in Mobile Station mode, setting a target signal strength, and adjusting transmit power to ensure optimal coverage, while also compensating for shadowing effects by calculating a power rise value based on averages of signal strengths reported by Mobile Stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compact BS increases its transmit power to provide acceptable data rate to users, then the data rate is improved, but the interference to the legacy system increases
Solution Approach 1:
The compact BS continuously monitors the signal strength of external BSs reported by MSs and uses this feedback to dynamically adjust its transmit power. The self-configuration controller compares the measured signal strength with a reference value and adjusts the transmit power accordingly, creating a closed-loop control system that balances data rate provision with interference minimization.
Solution Approach 2:
The system changes the transmit power parameter dynamically based on the propagation environment and measured signal strengths. The compact BS adjusts its transmit power level as a controllable parameter to achieve acceptable data rates while minimizing interference to the legacy system, transforming a static power level into an adaptive parameter.
2Measurement precision
If the compact BS uses a power ranging scheme to detect foreign users, then the detection capability is improved, but the complexity of determining whether access is triggered by user movement or excessive power increases
Solution Approach 1:
The patent introduces MSs as intermediaries that measure and report the signal strength of external BSs to the compact BS. This intermediary mechanism provides objective reference data about the external environment, enabling the compact BS to distinguish between legitimate foreign user access and access caused by excessive transmit power without requiring complex analysis algorithms.
3Area of stationary object
If the compact BS operates with high transmit power to cover shadow areas, then the coverage is improved, but the handover availability to and from external BS is reduced
Solution Approach 1:
The compact BS employs dynamic transmit power adjustment rather than operating at a fixed high power level. The self-configuration controller continuously adapts the transmit power based on measured signal strengths from MSs, enabling the system to expand coverage in shadow areas when needed while maintaining handover availability by reducing power when external BS signal strength is sufficient.
Data Source
AI summary
An apparatus and method for setting transmit power of a compact Base Station (BS) in a wireless communication system are provided. In the apparatus and method a measurer measures a signal strength corresponding to each of one or more neighbor BSs while operating in a Mobile Station (MS) mode, a receiver receives a signal strength corresponding to each of the one or more neighbor BSs measured by one or more MSs from the corresponding one or more MSs, and a self-configuration controller sets a target signal strength based on the signal strength corresponding to each of the one or more neighbor BSs measured in the MS mode and controls a transmit power so that the signal strength corresponding to each of the one or more neighbor BSs measured by the one or more MSs substantially reaches the target signal strength.