Decentralized Interference Reduction in Wireless Base Stations
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Solution Overview
Problem
In wireless communication systems using synchronized time division duplex schemes, atmospheric ducts and base station interference pose challenges, particularly due to delayed and attenuated signals causing interference between base stations, which existing solutions often require central node control, leading to communication bottlenecks and reliability issues.
Innovation Solution
A decentralized method where base stations use a sounding frame to detect interference by transmitting with a pre-defined downlink time interval size, measuring link quality, and adjusting subsequent downlink time intervals to reduce interference, eliminating the need for central node communication and enhancing system reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a central node controls interference reduction, then interference management can be coordinated across the network, but communication bottlenecks occur and system reliability decreases
Solution Approach 1:
The patent divides the interference management function from the central node and segments it to individual base stations. Each base station independently performs interference detection and mitigation actions locally, eliminating the communication bottleneck and single point of failure associated with central node control.
Solution Approach 2:
Base stations are empowered to autonomously detect interference conditions and apply mitigation measures without requiring central node coordination. This self-service approach improves reliability by removing central node dependency while maintaining effective interference management.
2Power
If base stations transmit with high power, then communication coverage and signal strength improve, but interference to other base stations increases
Solution Approach 1:
The patent implements a feedback mechanism where base stations monitor uplink signal quality and detect interference conditions. Based on this feedback, base stations dynamically adjust their downlink transmission parameters to mitigate interference while maintaining adequate coverage, resolving the contradiction between high power transmission and interference reduction.
Solution Approach 2:
Base stations dynamically change transmission parameters such as downlink time interval size and power levels based on detected interference conditions. This allows the system to adapt transmission power and timing to balance coverage requirements with interference mitigation to other base stations.
3Productivity
If downlink time interval size is increased, then data transmission capacity improves, but interference to other base stations in uplink period increases
Solution Approach 1:
The patent makes the downlink time interval size dynamic rather than fixed. Base stations adjust the size of downlink time intervals based on real-time interference detection, allowing the system to maximize data transmission capacity when interference is low and reduce interval size when interference threatens uplink reception at other base stations.
Solution Approach 2:
The system dynamically changes the time interval parameter based on interference conditions. When interference is detected in the uplink period, the downlink time interval size is reduced to prevent overlap with other base stations' uplink reception, thereby balancing productivity with interference mitigation.
Data Source
AI summary
A first base station (14) in a wireless communication system (10) operating according to a synchronised time division duplex scheme comprises an antenna (24), a radio communication unit (26) and an interference handling module (28). The interference handling module comprises an interference investigating unit (30) and a transmission control unit (34) configured to provide a sounding frame in which a variable downlink time interval has a pre-defined size long enough to provoke interference, order the interference investigating unit to obtain and analyse a link quality data parameter in a non-downlink time interval and determine whether interference from another base station is present. The transmission control unit is further configured to order the radio communication unit (26) to reduce the size of following variable downlink time intervals according to an interference reduction scheme for obtaining time intervals with a guaranteed reduced size if interference from another base station is present.