Beam Tapering for Spatial Interference Control
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Solution Overview
Problem
Wireless communications systems face challenges in managing self-interference (SI) and cross-interference (CI) in full duplex (FD) mode, leading to increased collisions, failed receptions, retransmissions, and decreased user experience due to beam sidelobes causing interference at wireless nodes.
Innovation Solution
Implementing closed loop spatial interference control by allowing base stations to manage beam shapes of wireless nodes through beam tapering configurations, which adjust power amplification levels to reduce interference by shaping beams into more pencil-like forms, thereby decreasing sidelobe power and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming is used to transmit signals in full duplex mode, then communication efficiency and spectral utilization are improved, but self-interference and cross-interference increase due to beam sidelobes
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different spatial regions through beam tapering. The main lobe receives full power for optimal communication, while sidelobes are locally reduced in power to minimize interference. This spatially differentiated power distribution resolves the contradiction by maintaining communication efficiency in the desired direction while suppressing harmful interference in other directions.
Solution Approach 2:
The patent changes the beamforming parameters, specifically the power distribution across antenna elements, by applying different tapering weights. This parameter modification transforms the beam pattern to reduce sidelobe levels while maintaining main lobe performance, thereby reducing self-interference and cross-interference without sacrificing communication efficiency.
2Object-generated harmful factors
If beam tapering is applied to reduce sidelobe power, then interference is reduced, but main lobe power and communication range may be compromised
Solution Approach 1:
The patent implements dynamic beam tapering where the system can adaptively select different tapering configurations based on real-time interference conditions and communication requirements. This dynamic adjustment allows the system to optimize the balance between main lobe power and sidelobe suppression, resolving the contradiction by making the power distribution flexible rather than fixed.
Solution Approach 2:
The system performs preliminary beam pattern simulation and analysis to determine optimal tapering weights before actual transmission. By pre-calculating the impact of different tapering configurations on both main lobe power and sidelobe levels, the system can select parameters that guarantee sufficient communication range while minimizing interference, avoiding the need to sacrifice main lobe power.
3Adaptability or versatility
If multiple beam tapering configurations are implemented, then interference control flexibility is improved, but system complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where wireless nodes report interference conditions and capability information to the base station. The base station uses this feedback to automatically select appropriate beam tapering configurations, reducing the need for manual configuration and simplifying system management while maintaining high adaptability to different interference scenarios.
Solution Approach 2:
The system enables self-service through capability messages where wireless nodes autonomously indicate their support for specific beam tapering configurations. This self-identification mechanism allows the base station to automatically configure appropriate parameters without requiring complex negotiation or configuration procedures, thereby managing system complexity while maintaining versatility.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may manage a shape of a beam to selectively reduce interference at one or more wireless nodes. The base station may receive a capability message from a first wireless node indicating a capability of the first wireless node to support one or more beam tapering configurations. In some cases, the base station may receive an interference report from a second wireless node, indicating that the first wireless node caused interference at the second wireless node. The base station may transmit a beam tapering configuration of the one or more beam tapering configurations to the first wireless node, and the first wireless node may transmit a beamformed message to the base station according to the beam tapering configuration. In some cases, the beam tapering configuration may be associated with less interference when transmitting the beamformed message.