Mobile telephone, mobile telephone system, and base station used therein

• US 20020049064A1
• Filed: 10/22/2001
• Published: 04/25/2002
• Est. Priority Date: 10/24/2000
• Status: Abandoned Application

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Banno, Satoshi
• Application Number:
  US09/982,817
• Publication Number:
  US 20020049064A1
• Time in Patent Office: Days
• US Class Current: 455/456.6
• CPC Class Codes: G01S 19/42 Determining position
• CPC Class Codes: G01S 3/30 derived directly from separate directional systems
• CPC Class Codes: G01S 5/0009 Transmission of position information to remote stations involving assistance data G01S5/0236
• CPC Class Codes: G01S 5/12 by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial

Abstract

A mobile telephone has a first acquisition means, which acquires position information of a base station having a stored position, a second acquisition means, which acquires position information for a current position, a calculation means, which, based on the position information acquired by the first acquisition means and the second acquisition means and position information input for the target position, calculates an angle formed between a line joining the current position and the base station and a line joining the current position and the target position, a first locating means, which, based on a received level of a signal transmitted from the base station, locates a direction to a location of the base station, and a second locating means, which, based on the direction located by the first locating means and the angle calculated by the calculation means, locates a direction to the target position.

Claims

1. A mobile telephone comprising:

a first acquisition means, which acquires position information of a base station having a stored position;

a second acquisition means, which acquires position information for a current position;

a calculation means, which, based on said position information acquired by said first acquisition means and said second acquisition means and position information input for the target position, calculates an angle formed between a line joining said current position and said base station and a line joining said current position and said target position;

a first locating means, which, based on a received level of a signal transmitted from said base station, locates a direction to a location of said base station; and

a second locating means, which, based on said direction located by said first locating means and said angle calculated by said calculation means, locates a direction to said target position.

2. A mobile telephone according to claim 1, wherein a direction to said target located by said second locating means is caused to be indicated on a display.

3. A mobile telephone according to claim 1, wherein said first locating means comprises:

a directional antenna receiving a signal transmitted from said base station; and

a calculation means calculating a field strength of said received signal, wherein,

said first locating means determines a calculated direction having a maximum field strength as a direction to a position of said base station.

4. A mobile telephone according to claim 1, wherein said second acquisition means acquires position information of said current position, based on signals sent from a plurality of GPS satellites.

5. A mobile telephone system comprising:

a mobile telephone according to any one of claim 1 to claim 4; and

a base station transmitting its own position information to said mobile telephone.

6. A base station used in a mobile telephone system according to claim 5, which transmits its own position information in response to a request from said mobile telephone.