DAS Remote Unit Interference Detection and Power Adjustment
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Solution Overview
Problem
Distributed antenna systems (DAS) face interference from external RF signals, particularly from macrocell base stations, which can disrupt signal coverage and connectivity for subscriber units by causing them to connect to interfering devices rather than the DAS remote units, due to overlapping frequencies and high power transmission.
Innovation Solution
Remote units in the DAS are reconfigured to receive interference signals from external interfering devices, derive information about these devices, and adjust their transmission attributes, such as power levels, to ensure subscriber units connect to the DAS rather than the interfering devices, thereby maintaining adequate signal-to-noise ratio and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If remote units transmit at high power to maintain coverage, then signal coverage area is improved, but interference from external devices increases causing subscriber units to connect to wrong devices
Solution Approach 1:
The remote unit temporarily reconfigures its receiver to receive interference signals from external devices, derives information about these devices, and uses this feedback to adjust its transmission attributes. This closed-loop feedback mechanism allows the system to adapt to external interference conditions and maintain proper subscriber unit connections.
Solution Approach 2:
The remote unit dynamically adjusts its transmission attributes (such as power levels, frequency, or other parameters) based on the interference information derived from external devices. By changing transmission parameters in response to detected interference, the system maintains coverage while avoiding the harmful effects of external device interference.
2Reliability
If remote units adjust transmission attributes to overcome interference, then connection reliability to DAS is improved, but energy consumption increases
Solution Approach 1:
The remote unit performs preliminary detection of external interfering devices by temporarily reconfiguring its receiver before transmission adjustments are made. By identifying interference sources in advance and deriving information about them, the system can make targeted transmission attribute adjustments rather than continuously operating at high power, thereby reducing energy consumption while maintaining connection reliability.
Solution Approach 2:
The receiver is temporarily reconfigured only when needed to detect interference, rather than continuously operating in interference detection mode. This partial action approach allows the system to gather necessary interference information without permanently sacrificing reception capabilities or consuming excessive energy, achieving a balance between reliability and energy efficiency.
Data Source
AI summary
A remote unit of a distributed antenna system (DAS) includes: interface device configured to interface with an upstream component of the DAS; and receiver communicatively coupled to an antenna and configured to receive signals from at least one subscriber unit within a coverage area of the DAS. The receiver temporarily reconfigured to receive interference signals from an interfering device outside of the coverage area of the DAS. The interference signals cause a subscriber unit to establish a connection with the interfering device rather than the remote unit of the DAS. The remote unit configured to derive information about the interfering device from the interference signals. The remote unit configured to adjust at least one attribute to cause the subscriber unit to establish connection with the remote unit rather than the interfering device.