Location Estimation Using Beam Radiation Characteristics
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Solution Overview
Problem
In millimeter wave wireless communication networks, the unknown beam pattern of base station devices makes it difficult to accurately calculate the distance between a wireless communication terminal and the base station, thereby complicating precise location estimation of the terminal.
Innovation Solution
A location estimation system that includes multiple wireless communication devices and a control device, where each device receives signals using beams in various directions, calculates reception qualities, and the control device estimates the arrival direction of the signal by comparing these qualities with stored radiation angle characteristics, ultimately determining the terminal's location based on the estimated arrival directions and device locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-forming training is performed between base station devices and wireless communication terminals in millimeter wave networks, then communication reliability is improved through directivity control, but location estimation accuracy deteriorates due to unknown beam patterns
Solution Approach 1:
The system performs beam-forming training in advance to establish beam patterns and store radiation angle characteristics before location estimation. The base station devices and wireless communication terminals conduct beam sweeping and measure reception qualities during training, storing the beam pattern information that will be used for subsequent location estimation, thus resolving the contradiction by preparing necessary data beforehand
Solution Approach 2:
The invention introduces radiation angle characteristics as an intermediary element that bridges beam-forming training and location estimation. By storing and comparing reception qualities against pre-measured radiation angle characteristics, the system can estimate arrival directions without needing real-time beam pattern knowledge, thus maintaining location estimation accuracy while preserving communication reliability through directivity control
2Reliability
If base station devices use multiple beams for signal reception, then communication coverage and reliability are improved, but the complexity of location estimation increases due to unknown beam patterns
Solution Approach 1:
The system performs beam pattern measurement and stores radiation angle characteristics during an initial training phase. This preliminary action captures the complex beam pattern information that would otherwise complicate real-time location estimation, allowing the system to use simpler comparison operations during actual location estimation while maintaining multi-beam reception reliability
Solution Approach 2:
The invention creates a copy of the beam pattern information in the form of stored radiation angle characteristics. Instead of dealing with the complex real-time beam patterns during location estimation, the system uses the pre-captured copy of beam characteristics, significantly reducing estimation complexity while maintaining signal reception reliability through the original multi-beam configuration
Data Source
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AI summary
A location estimation system for estimating a location of a wireless communication terminal, the location estimation system including first to M-th wireless communication devices and a control device, wherein i-th wireless communication device includes communication circuitry, which in operation, receives a signal transmitted from the wireless communication terminal using beams in Ni directions, and control circuitry, which in operation, calculates Ni reception qualities corresponding to the beams in the Ni directions, respectively, and wherein the control device includes control circuitry, which in operation, estimates i-th arrival direction of the signal received by the i-th wireless communication device by comparing the Ni reception qualities with the radiation angle characteristics of the beams in the Ni directions, and estimates the location of the wireless communication terminal based on the first to the M-th arrival directions estimated and locations of the first to the M-th wireless communication devices.