Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-09-27
1998-10-27
Au, Amelia
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455435, H04B 724
Patent
active
058289585
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a mobile communications system and a communications network capable of reducing traffic on common control lines in and between networks.
BACKGROUND ART
Two systems are widely known as conventional mobile communications systems: GSM (Global System for Mobile communications) mainly used in Europe; and PDC (Personal Digital Cellular) used in Japan and the U.S.
FIG. 1 shows a GSM system. There are provided a plurality of visiting areas 50, 51 and 52 in networks 10 and 11 offered by common carriers, and communication terminals 60 communicate while moving in the visiting areas. The visiting areas 50, 51 and 52 include visitor location registers 30, 31 and 32, respectively. These registers are connected to the communication terminals 60, which are present in the visiting areas, through switching machines 41, 42 and 43, and manage information about the terminals.
The visitor location registers 30-32 are further connected to a home location register 20 through common control lines. The home location register 20 stores the numbers of the visitor location registers, which indicate areas the communication terminals 60 are visiting, and information about the communication terminal. Each communication terminal is registered in advance in a predetermined home location register.
When the communication terminal 60 is present in the visiting area 50, information about the communication terminal is sent from the home location register 20 to the visitor location register 30 to be stored, and the number of the visitor location register 30 is stored in the home location register 20. When the communication terminal 60 moves from the visiting area 50 in the communications network 10 to the visiting area 51 in the communications network 11, the communication terminal 60 carries out a position registration in the home location register 20 through the switching machine 42.
FIG. 2A illustrates the location registration. When the communication terminal 60 enters the visiting area 51, and sends a location registration signal to the switching machine 42, the visitor location register 31 carries out the location registration of the communication terminal 60. Specifically, the visitor location register 31 sends to the home location register 20 the communication terminal number and visitor location register number associated with the communication terminal 60. The home location register 20 rewrites the visitor location register number from 30 to 31, and requires the visitor location register 30 to delete the information about the communication terminal 60. Besides, it sends the information about the communication terminal 60 to the visitor location register 31. Subsequently, the location registration signal is sent back from the home location register 20 to the communication terminal 60 through the visitor location register 31 and switching machine 42, thus completing the location registration.
When the communication terminal 60 further moves from the visiting area 51 to the visiting area 52 within the same communications network 11, the processing similar to that of FIG. 2A is carried out. That is, a similar processing is performed in which the switching machine 42, visitor location register 31 and visitor location register 30 are replaced by the switching machine 43, visitor location register 32 and visitor location register 31, respectively.
FIG. 2B illustrates the processing procedure of a call connection occurred while the communication terminal 60 is present in the visiting area 51. A call to the communication terminal 60 is connected to the switching machine 40 linked to the home location register 20. The switching machine 40 inquires of the home location register 20 the location of the communication terminal 60. The home location register 20 inquires of the visitor location register 31 the location of the communication terminal 60 using the visitor location register number stored in the home location register 20 as the information about the communication terminal 60. The visitor
REFERENCES:
patent: 5519706 (1996-05-01), Bantz et al.
patent: 5577264 (1996-11-01), Tuohino
patent: 5649301 (1997-07-01), Yabusaki et al.
patent: 5659544 (1997-08-01), La Porta et al.
Ishida So
Nakamura Hiroshi
Uchiyama Yasuyuki
Au Amelia
Johnson John T.
NTT Mobile Communications Network Inc.
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