Base Station Uplink Interference Mitigation via Atmospheric Duct Detection
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Solution Overview
Problem
In mobile communication systems using synchronized time division schemes, atmospheric ducts cause interference by delaying and amplifying downlink signals, leading to potential base station interference during uplink communication, which can disrupt normal operation and prevent signal reception from mobile stations.
Innovation Solution
A method and system for a base station to measure link quality during uplink communication, identify interference from other base stations, and perform interference limitation activities, such as adjusting antenna tilt or traffic allocation, to mitigate interference caused by atmospheric ducts and faulty operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If base stations transmit with high power in downlink periods, then downlink communication coverage is improved, but uplink reception quality deteriorates due to atmospheric duct interference
Solution Approach 1:
The base station dynamically adjusts its transmission parameters based on detected interference conditions. When atmospheric duct interference is detected through link quality measurements, the base station modifies its behavior in response to changing environmental conditions, transitioning between different operational states to maintain both downlink coverage and uplink quality
Solution Approach 2:
The system implements a feedback mechanism where the base station measures link quality during uplink communication, compares measurements against thresholds, and uses this information to detect interference from other base stations. This feedback loop enables the system to identify and respond to atmospheric duct conditions that cause harmful signal propagation
2Stability of the object's composition
If synchronized time division scheme is used, then system coordination is improved, but interference from atmospheric ducts worsens because delayed signals arrive during uplink periods
Solution Approach 1:
The base station performs preliminary detection of interference conditions by measuring link quality during uplink communication before the harmful delayed signals arrive. By detecting the presence of atmospheric duct interference in advance through correlation analysis and threshold comparison, the system can prepare appropriate mitigation responses
Solution Approach 2:
The system changes operational parameters in response to detected interference conditions. When atmospheric duct interference is identified, the base station modifies transmission or reception parameters to mitigate the harmful effects of delayed signals arriving during uplink periods, while maintaining synchronized operation
3Measurement precision
If base station monitors link quality continuously, then interference detection precision is improved, but system complexity increases
Solution Approach 1:
The base station uses its existing uplink reception functionality to simultaneously perform interference detection. By analyzing link quality measurements that are already being taken for normal communication purposes, the system achieves interference detection without requiring separate dedicated monitoring hardware or complex additional systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively limits uplink interference, ensuring reliable communication by identifying and addressing interference from other base stations, even in scenarios where atmospheric ducts cause signal delays and amplification, thereby maintaining normal operation with minimal modifications to existing systems.
Implementation Method 1
An atmospheric duct is a horizontal layer that is created in the lower atmosphere, typically the troposphere. In such a duct the vertical refractive index gradients are such that radio signals (and light rays) are guided or ducted along the length of the duct.
Implementation Method 2
For a mobile communication system, an atmospheric duct will cause long-distance downlink (DL) signals for base stations to mobile stations to travel through the atmosphere with long transmission delay but with a very low attenuation.
Data Source
AI summary
A base station (14) in a mobile communication system operating according to a synchronized time division scheme comprises an antenna (26), a radio communication unit (24) for communicating with mobile stations of the system and an interference investigating unit (28) comprising a link quality measuring element (30), which obtains link quality measurements that are measured in the base station during uplink communication (UL) between at least one mobile station and the base station, a link quality evaluation element (32) that compares link quality measurements of at least one uplink channel with a link quality threshold and determines that the uplink channel is interfered by another base station if the link quality threshold is exceeded, a base station identifying element (34) that identifies the other base station via signals broadcast by the other base station and an interference limiting element (36) configured to perform an interference limitation activity based on the identification.