Adapting Beamformed Transmission for Interference Avoidance
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Solution Overview
Problem
Current mechanisms for interference avoidance in radio communication systems, particularly for base stations using beamformed transmission, are inadequate as they often require reducing output power or creating exclusion zones, which can limit capacity and deployment flexibility.
Innovation Solution
A method and control node that adapt beamformed transmission by obtaining information on the distance and direction to a radio communication site and its operating frequency band, allowing for precise adjustment of emissions to stay within prescribed limits, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamformed transmission is used to increase output power and improve coverage, then network capacity and deployment flexibility improve, but interference to radio communication sites (radar, astronomy, etc.) increases
Solution Approach 1:
The patent applies local quality by directing beamformed transmission with different characteristics to different spatial regions. Specifically, the base station transmits with higher power and gain towards user equipment directions while applying lower power and reduced gain towards directions of radio communication sites. This spatial differentiation allows the system to maintain high network capacity in service areas while minimizing interference to sensitive facilities, resolving the contradiction between productivity and harmful effects.
Solution Approach 2:
The patent implements dynamics by making the beamformed transmission parameters adaptive rather than fixed. The control node dynamically adjusts transmission power, beamforming weights, and directional characteristics based on real-time information about user equipment locations, radio communication site positions, and operating frequency bands. This dynamic adaptation enables the system to optimize network capacity when users are present while automatically reducing interference when radio communication sites are detected in specific directions and frequency ranges.
2Object-affected harmful factors
If exclusion zones are created or output power is reduced to avoid interference, then interference to radio communication sites is avoided, but deployment flexibility and network capacity are limited
Solution Approach 1:
The patent applies segmentation by dividing the transmission space into multiple directional sectors or beams, each with independently controllable power and characteristics. Instead of creating a blanket exclusion zone that limits deployment, the system segments the coverage area and applies targeted power control only in directions toward radio communication sites. This allows the base station to be deployed in locations that would otherwise be restricted, maintaining deployment flexibility while achieving interference avoidance through spatial segmentation.
Solution Approach 2:
The patent implements parameter changes by dynamically modifying transmission parameters (power level, frequency band, beamforming weights) based on the detected presence and characteristics of radio communication sites. Rather than fixed power reduction or rigid exclusion zones, the system changes parameters adaptively - reducing power only in specific directions and frequency bands where interference would occur, while maintaining full power and flexibility in other directions. This resolves the contradiction by enabling deployment flexibility through parameter adaptation rather than rigid spatial restrictions.
Data Source
AI summary
There is provided mechanisms for adapting beamformed transmission from a base station. A method is performed by a control node. The control node is configured to control the beamformed transmission. The method comprises obtaining a first piece of information indicative of distance to, and direction towards, a radio communication site relative the base station. The method comprises obtaining a second piece of information indicative of operating radio frequency band of the radio communication site. The method comprises adapting the beamformed transmission so as to keep emission from the base station in the direction towards the radio communication site that contributes within the operating radio frequency band of the radio communication site within a prescribed limit.