Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-09-04
1999-03-16
Dolinar, Andrew M.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
H04Q 722
Patent
active
058841695
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to roaming mobile communication system and method for carrying out a roaming operation between mobile communication networks.
BACKGROUND ART
In mobile communication which is becoming widely used in recent years, communication schemes with different systems are adopted by a plurality of communication business companies, such as an NTT scheme, J-TACS scheme, N-TACS scheme, GSM scheme, PDC scheme, etc. Then, when a mobile subscriber moves to another business company's service area, the so called roaming operation is provided as a service for enabling calling and call receiving from that service area using a different system.
For this roaming which enables the call termination connection regardless of where the mobile subscriber is located, the following two schemes are conventionally known. Namely, a scheme in which a visited location register of a visited network temporarily allocates a roaming number at a time of call termination connection, and a scheme in which a gateway location register of a visited network allocates a roaming number at a time of position registration.
First, the former one of the conventionally known schemes described above, that is a scheme in which a visited location register of a visited network temporarily allocates a roaming number at a time of call termination connection, will be described. In order to describe this scheme, a configuration of a mobile communication system is shown in FIG. 1, and its control methods are shown in FIG. 2 and FIG. 3. In each of these figures, VMSC (Visited Mobile Switching Center) is a visited mobile switching center, VLR (Visited Location Register) is a visited location register, HLR (Home Location Register) is a home location register, and GMSC (Gateway Mobile Switching Center) is a gateway mobile switching center. Also, a solid line indicates a communication channel, and a dashed line indicates a control channel.
As shown in FIG. 2, when a mobile subscriber moves (1) to a control area of some visited mobile switching center VMSC2, a position registration request (2) is made with respect to the visited mobile switching center VMSC2. When the position registration request (2) is received, the visited mobile switching center VMSC2 carries out a position registration request (3) with respect to a visited location register VLR2. When the position registration request (3) is received, the visited location register VLR2 normally searches an information of that mobile subscriber and updates a position information. However, the visited location register VLR2 does not store an information of a subscriber who requested the position registration for the first time, so that a region for storing an information of that subscriber is secured, and a position information of that subscriber is stored. In addition, the visited location register VLR2 notifies (4) an ID number of the visited mobile switching center VMSC2 and an ID number of the visited location register VLR2 to a home location register HLR which constantly stores the subscriber information of that subscriber. The home location register HLR stores (5) these visited mobile switching center ID number and visited location register ID number.
Next, when a received call for the mobile subscriber occurs, as shown in FIG. 3, this received call is routed as an IAM (Initial Address Message) to a gateway mobile switching center GMSC of the mobile communication network to which this subscriber is subscribing, according to the subscriber number of that subscriber. The gateway mobile switching center GMSC requests (2) an information for routing the received call to that mobile subscriber, with respect to the home location register HLR. When the routing information request (2) from the gateway mobile switching center GMSC is received, the home location register HLR searches an information of that subscriber, and learns the ID number of the visited mobile switching center VMSC2 and the ID number of the visited location register VLR2. In addition, the home location regi
REFERENCES:
patent: 5497412 (1996-03-01), Lannen et al.
patent: 5610974 (1997-03-01), Lantto
patent: 5659544 (1997-08-01), LaPorta et al.
Nakamura Hiroshi
Uchiyama Yasuyuki
Dolinar Andrew M.
NTT Mobile Communications Network Inc.
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