Beamforming Interference Mitigation via Relay Node Switching
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Solution Overview
Problem
Wireless networks face interference issues due to beamforming, where signals directed at one device can interfere with other devices in the same coverage area, particularly when using orthogonal frequency-division multiple access systems like LTE, leading to degraded performance.
Innovation Solution
A method and system that monitor the angle between a formed beam and a relay signal, determining a threshold angle where interference occurs, and mitigate interference by switching the relay node to another access node or disabling the beam, ensuring continued high-quality service without reducing coverage to other devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used to provide better coverage to wireless devices in specific locations, then coverage quality is improved, but interference with other wireless devices increases
Solution Approach 1:
The system continuously monitors interference levels between formed beams and relay signals, using this feedback to dynamically adjust beam parameters or switch connections when interference thresholds are exceeded, thereby maintaining coverage quality while preventing harmful interference
Solution Approach 2:
The beamforming system dynamically adjusts beam characteristics such as direction, width, and power based on real-time conditions, allowing the system to optimize coverage for target devices while automatically reducing interference to other devices when conditions change
2Reliability
If formed beams are directed towards wireless devices at certain positions, then service quality for those devices is improved, but interference with relay nodes increases
Solution Approach 1:
The system monitors the angle between formed beams and relay signals, and when this angle indicates potential interference, it triggers mitigation actions such as switching the relay node connection to a different access node, thus maintaining service quality while preventing relay interference
Solution Approach 2:
The system proactively identifies potential interference conditions by monitoring beam and relay signal angles, and takes preventive action by switching relay connections before actual interference occurs, ensuring continuous high-quality service without degradation
3Productivity
If frequency reuse factor of one is used in orthogonal frequency-division multiple access systems, then network capacity is improved, but interference between adjacent sectors increases
Solution Approach 1:
The system applies different frequency or beam characteristics to different spatial locations and sectors, allowing high frequency reuse in areas where interference is not an issue while using differentiated characteristics in adjacent sectors where interference would occur, thus maintaining high network capacity while preventing sector interference
Data Source
AI summary
Systems, methods, and processing nodes minimize interference in a wireless network. Minimizing interference includes determining that an angle between a first formed beam directed towards a wireless device and a relay signal directed towards a relay node is equal to or is less than a threshold angle. The wireless device can operate in a first area of network coverage, and the relay node operates in a second area of the network coverage. The first formed beam can interfere with the relay node upon the angle being equal to or less than the threshold angle. Minimizing interference also includes switching a connection of the relay node from a first access node to a second access node.