Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1997-09-12
2001-11-13
Legree, Tracy (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S446000, C455S566000, C701S208000
Reexamination Certificate
active
06317605
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile communications system, and in particular to a micro-cellular communications system which performs call connections between mobile terminals.
2. Description of the Related Art
In mobile communications, a user having a mobile terminal therewith may move from one cell to another or between different service areas. Therefore, it is important to inform the user through the mobile terminal where it is located. A navigation system using GPS (Global Positioning System) has been known as such a location displaying system.
Further, a mobile navigation system combining a mobile communications system with the navigation system has been proposed in Japanese Patent Unexamined Publication No. 1-142899. More specifically, in the mobile navigation system, a mobile switching center is provided with a map information memory. When receiving the location information of a mobile terminal, the mobile switching center reads map information based on the location information from the map information memory and transmits it to that mobile terminal. Therefore, the mobile terminal can display the map information appropriate for the location on screen and the user can easily be informed where the user is.
SUMMARY OF THE INVENTION
In the case of calling, however, the calling user cannot know where the destination terminal is located. In other words, the conventional system cannot provide the location information of both sides of connection. Therefore, the calling and called users cannot be informed whether they are near. Further, the conventional mobile terminal needs the GPS receiver, resulting in increased amount of hardware and complicated circuit in the mobile terminal.
An object of the present invention is to provide a mobile communications system and a mobile terminal which can provide the location information of both the mobile terminal and another mobile terminal with reduced size and weight.
Another object of the present invention is to provide a mobile terminal which can receive and display the map information including the location of another mobile terminal.
According to the present invention, in a mobile communications system comprising a plurality of radio cell stations each forming a micro cell and performing call connections between mobile terminals, location data and map data for each of the radio cell stations are stored onto a database. When receiving a data request from a first mobile terminal through a first radio cell station, the data request including designation of a second mobile terminal, the database is searched for first location data of the first radio cell station, second location data of a second radio cell station forming a micro cell in which the second mobile terminal is located, and map data for at least one of the first and second radio cell stations. Then the first and second location data and retrieved map data are transferred to the first mobile terminal through the first radio cell station.
The first mobile terminal, when receiving the first and second location data and retrieved map data from the mobile communications system through the first radio cell station, displays a map and two locations corresponding to the first and second mobile terminals on screen based on the retrieved map data and the first and second location data.
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Craver Charles
Helfgott & Karas P.C.
Legree Tracy
NEC Corporation
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