HeNB Location Determination via Terminal RSTD Measurements
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Solution Overview
Problem
In indoor environments, determining the location of Home Evolved Node B (HeNB) base stations for mobile communication services is challenging due to signal shadowing and the high cost of installing GPS transceivers, which limits the installation locations and increases material costs.
Innovation Solution
A method where the HeNB determines its location by receiving location information from terminals, assessing the reliability of this information, and adjusting terminal positions if necessary, without requiring a GPS transceiver, allowing synchronization through network servers for time and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS transceiver is installed in HeNB, then location determination accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent introduces terminal devices as intermediaries to determine base station location. Instead of equipping HeNB with GPS, the system uses terminals that already have location capabilities to measure reference signal time difference (RSTD) and calculate base station position, thereby avoiding additional GPS hardware cost while achieving location determination.
Solution Approach 2:
The patent copies the location determination function from GPS-equipped devices to terminals using communication signals. Terminals utilize their existing locationing capabilities and communication infrastructure to derive base station location information, creating a virtual GPS solution that eliminates hardware duplication.
2Measurement precision
If GPS transceiver is installed in HeNB, then location determination capability is improved, but installation location flexibility deteriorates
Solution Approach 1:
By using terminal devices as intermediaries for location measurement, the system removes the constraint of requiring GPS signal reception at the base station site. Terminals can determine base station location through communication signals regardless of indoor GPS shadowing, thereby enabling flexible installation in various locations including indoor environments.
Solution Approach 2:
The patent replaces the GPS satellite-based positioning mechanism with a communication-signal-based positioning mechanism. This substitution eliminates dependency on GPS signal availability and external satellite infrastructure, allowing base stations to be installed anywhere within communication coverage areas including GPS-denied environments.
3Ease of manufacture
If terminal location information is used to determine base station location, then manufacturing cost is reduced, but information reliability may deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the base station evaluates the reliability of terminal-provided location information by checking whether terminals are located in GPS shadow regions. The system uses terminal location data, GPS signal availability status, and RSTD measurement quality as feedback to determine whether to trust and use the terminal-derived base station location information.
Solution Approach 2:
The system performs preliminary checks to assess terminal location reliability before using terminal information for base station positioning. By evaluating GPS shadowing conditions and terminal positioning accuracy in advance, the system pre-qualifies which terminal measurements can be trusted, ensuring reliable location determination while maintaining cost efficiency.
Data Source
AI summary
The present invention relates to a communication technique for convergence of IoT technology and a 5G communication system for supporting a higher data transfer rate beyond a 4G system, and a system therefor. Also, the present invention provides a method for determining a location of a base station, the method comprising the steps of: receiving, from a terminal, a first message including location information of the terminal; and determining location information of the base station on the basis of the received location information of the terminal.