Mobile communication system

• US 6,564,054 B1
• Filed: 08/04/1999
• Issued: 05/13/2003
• Est. Priority Date: 02/19/1999
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sugiyama, Kouji, Miyazaki, Hironaga, Imafuku, Keiko, Yoshida, Koichi, Yamashita, Tomoko
• Primary Examiner(s): Nguyen, Lee
• Assistant Examiner(s): Nguyen, Simon
• Application Number:
  US09/369,237
• Time in Patent Office: 1,378 Days
• Field of Search: 455/422, 455/426, 455/432, 455/435, 455/439, 455/462, 455/465, 455/520, 455/7, 455/20, 455/554, 455/555, 455/445, 379/219, 379/220.01, 379/221-1-2, 370/217
• US Class Current: 455/432.1
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

In a mobile communication system comprising a PBX connected to a mobile communication network through an interface unit and having a semi-public roaming function, a first PBX is connected to a second PBX having the semi-public roaming function with a leased circuit. The first PBX transmits a position registration/call transmission request of a PHS received by itself to a mobile communication network through the second PBX. The second PBX transmits a call reception request addressed to the PHS from the mobile communication network to the PHS through the first PBX.

Claims

1. A mobile communication system comprising;

a first exchange for accommodating a base station which communicates with a mobile station, and

a second exchange having a semi-public roaming function connected to the first exchange with a leased circuit and connected to a mobile communication network through an interface unit;

the first exchange having a converting means for converting position information of the mobile station as prestored therein into virtual position information peculiar to the mobile communication network and for transmitting the virtual position information to the interface unit through the second exchange, and a decision means for deciding whether to transmit to the mobile communication network through the first exchange itself or through the leased circuit, and

the second exchange having a transmission setting means for setting a transmission of response information from the mobile communication network for the virtual position information to the first exchange.

2. The mobile communication system as claimed in claim 1 wherein the first and the second exchanges comprise PBX'"'"'s.

3. The mobile communication system as claimed in claim 2 wherein the position information and the virtual position information respectively comprise position registering information and virtual position registering information.

4. The mobile communication system as claimed in claim 3 wherein the position information and the virtual position information respectively comprise calling information and virtual calling information including the position registering information.

5. The mobile communication system as claimed in claim 2 wherein the converting means inverts the virtual position information into the position information.

6. The mobile communication system as claimed in claim 3 wherein the transmission setting means sets a transmission of called information addressed to the mobile station position-registered from the mobile communication network to the first PBX.

7. The mobile communication system as claimed in claim 2 wherein the first PBX is connected to the mobile communication network through an interface unit the first PBX itself accommodates to perform the semi-public roaming function, and

the first PBX transmits the position information to the mobile communication network through its own interface unit when the decision means decides that the interface unit is available, and transmits the position information to the mobile communication network through the second PBX when the decision means decides that the interface unit is unavailable.

8. The mobile communication system as claimed in claim 7 wherein the first PBX is connected to a plurality of PBX'"'"'s which accommodate the interface unit of the mobile communication network with a leased circuit, and

when its own interface unit is not available, the decision means decides whether or not the leased circuit is available and transmits the position information through the available leased circuit.

9. The mobile communication system as claimed in claim 7 wherein the first PBX includes a means for transmitting an inquiry message inquiring whether or not the accommodated interface unit is available to another PBX through the leased circuit, and

a PBX which has received the inquiry message has a means for returning a response message for the inquiry message.

10. The mobile communication system as claimed in claim 8 wherein PBX'"'"'s except the first PBX have a means for notifying the first PBX of unit status information indicating whether or not the accommodated interface unit is available, and

the first PBX has a means for transmitting the position information to a PBX which stores the unit status information and accommodates the available interface unit.

11. The mobile communication system as claimed in claim 8 wherein the first PBX has a means for selecting a PBX which accommodates the interface unit based on a preset priority.

12. The mobile communication system as claimed in claim 8 wherein the first PBX has a means for sequentially and equally selecting a PBX which accommodates the interface unit.

13. The mobile communication system as claimed in claim 8 wherein the first PBX has a means for selecting another PBX which forms a transmission object of the position information according to a preset time zone.

14. The mobile communication system as claimed in claim 8 wherein the first PBX has a means for transmitting the position information through an interface unit of another PBX when the circuit available number of its own present interface unit is more than a preset circuit available number.

15. The mobile communication system as claimed in claim 8 wherein the first PBX accommodates a plurality of base stations and has a means for designating a PBX to which the position information is transmitted for each base station.

16. The mobile communication system as claimed in claim 2 wherein the mobile station and the interface unit respectively comprise a PHS and a PHS interface unit.