Beamforming Weight Selection for Millimeter Wave Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communications systems, especially those operating in higher frequency ranges like millimeter wave (mmW) systems, larger antenna arrays used for beamforming transmissions result in increased side lobes, leading to interference with other devices.
Innovation Solution
A method for wireless communications where a user equipment (UE) determines sets of beamforming weights for uplink communications, each set corresponding to a transmit beam with a same main lobe signal strength but different side lobe signal strengths. The UE then transmits signals using these beams and receives feedback to identify which sets of beamforming weights cause interference, allowing it to adjust and mitigate interference in subsequent transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If larger antenna arrays are used for beamforming transmissions, then beamforming performance is improved, but side lobe interference increases
Solution Approach 1:
The patent applies local quality by differentiating between main lobe and side lobe regions. It uses beamforming weights to concentrate energy in the main lobe direction while suppressing energy in side lobe regions. The system evaluates both main lobe signal strength and side lobe signal strength properties to select optimal beams, treating different spatial regions with different quality requirements.
Solution Approach 2:
The patent changes the beamforming weight parameters to control the radiation pattern. By adjusting these weights, the system modifies the main lobe and side lobe characteristics of the beam. The UE evaluates multiple sets of beamforming weights with different main lobe and side lobe properties to find the optimal balance between signal strength and interference.
2Object-generated harmful factors
If multiple sets of beamforming weights are evaluated, then interference mitigation is improved, but computational complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-evaluating multiple sets of beamforming weights and their corresponding main lobe and side lobe properties before actual communication. The UE determines and stores these properties in advance, then uses them during beam selection without performing complex real-time calculations, thus reducing operational complexity.
Solution Approach 2:
The system uses feedback mechanisms where the UE receives indications from network nodes about which beamforming weights to use. This feedback loop allows the UE to select optimal beams based on previously evaluated properties while reducing the need for exhaustive real-time computation. The network provides guidance based on interference measurements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may be configured with a set of beamforming weights, each beamforming weight corresponding to a transmit beam of a set of transmit beams that may each include a same primary lobe and one or more different side lobes. The UE may then perform a beam training procedure to determine which transmit beams cause more or less interference at one or more nearby UEs. The UE may transmit signals using one or more of the transmit beams, and the nearby UEs may determine which transmit beams and corresponding beamforming weights cause more or less interference. The nearby UEs may then indicate those transmit beams or beamforming weights that cause more or less interference via different options.