Base station and mobile terminal for location detection, and location detecting method

Abstract

Disclosed are a base station and a mobile terminal for location detection, and a location detecting method. The base station in which a plurality of antennas having RF modules are installed transmits a signal including location information of each of the antennas to the mobile terminal. The mobile terminal carries out location detection by selectively using location information received from a GPS receiver or location information received from a DSRC transceiver. The base station and mobile terminal for location detection can perform location detection with high accuracy using the existing DSRC service. Thus, the base station and mobile terminal can carry out location detection having an error of approximately 10 m in downtown areas or buildings.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims priority to and the benefit of Korea Patent Application No. 2003-89733 filed on Dec. 10, 2003 in the Korean Intellectual Property Office, the entire content of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] (a) Field of the Invention [0003] The present invention relates to a base station and a mobile terminal for location detection, and a location detecting method. More specifically, the present invention relates to a base station and a mobile terminal for location detection, and a location detecting method using a GPS technique and dedicated short range communication (DSRC). [0004] (b) Description of the Related Art [0005] Methods for detecting locations of mobile terminals include a technique that decides a location of a base station having a cell ID as a location of a mobile terminal, an AOA (Arrival Of Angle) method by which a base station determines a location of a mobile termin...

AI Technical Summary

Benefits of technology

[0018] It is an advantage of the present invention to provide a base station and a mobile terminal for location detection, and a location detecting method for accurately detecting a location of a mobile terminal by selectively using a GPS technique and DSRC.

[0019] To accomplish the object of the present invention, a base station in which a plurality of antennas having RF modules are installed transmits a signal including location information of each of the antennas to a mobile terminal. The mobile terminal carries out location detection by selectively using location information received from a GPS receiver or location information received from a DSRC transceiver.

[0020] In one aspect of the present invention, a base station for location detection includes a location information generator for generating location information of each of a plurality of antennas arranged at specific intervals; a central processing unit for preventing the antennas from interfering with one another, processing data transmitted and received between the base station and a mobile terminal, and generating a periodic beacon signal and transmitting it to the mobile terminal; a location information processor for loading the location information of each of the antennas generated by the location information generator in a header of the beacon signal and transmitting the beacon signal to a corresponding antenna; and a modulating / demodulating unit for converting data transmitted and received between the central processing unit and the antennas into an analog or digital signal.

[0021] The base station further includes a plurality of multiplexers for simultaneously outputting the beacon signal transmitted from the central processing unit through the modulating / demodulating unit to the antennas.

[0022] The base station further includes a buffer for receiving data transmitted from the mobile terminal through the plurality of antennas and delivering the data to the modulating / demodulating unit.

[0023] Preferably, a cell diameter of each of the antennas is 10 to 15 m.

Problems solved by technology

However, it consumes a large amount of electric power, requires a long time to first fix (TTFF), and has many restrictions on location detection indoors and in downtown areas due to interference of multiple paths and an insufficient number of visible satellites.

However, this method has a problem in that accuracy of a location detecting result varies with a cell diameter.

However, this technique has a large location error because it is difficult to secure LOS (Line Of Sight) due to a multi-path in downtown areas.

Furthermore, since the AOA method requires an array antenna, the mobile terminal has difficulty in using the method.

However, this technique has poor location accuracy.

In addition, its location detection performance is deteriorated due to a plurality of mobile terminals.

The techniques using a GPS have geographical restrictions that require LOS to be secured, need a long time to first fix, and consume a large amount of electric power, although they can detect a location of a mobile terminal relatively easily.

However, the network assisted GPS method has a problem in that a location detection error is increased depending on a cell area when a location of a mobile terminal is detected using a network.

Furthermore, a location detection error is increased due to a multi-path effect in downtown areas.

As a distance between a mobile terminal and the base station is increased, the location detection error is also increased.

The TDOA method generates an error caused by locations of base stations, an error due to a multi-path in downtown areas, an error caused by a near-far problem due to a high reception signal from a near base station, and so on.

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