Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1999-05-18
2001-11-06
To, Doris H. (Department: 2682)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S435100, C455S422100, C455S412100
Reexamination Certificate
active
06314291
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a home location register controller used in a mobile communication system, such as a mobile telephone system, a personal handy phone system (PHS), or the like, particularly, relates to a home location register controller capable of dealing with congestion of access for a home location register (HLR) of the mobile communication system.
A conventional mobile communication system has mobile services switching centers (MSCs), a home location register, and mobile stations for subscribers. The home location register stores a database including information of the subscribers and the mobile stations. The home location register is accessed by the mobile services switching centers to carry out routing circuits and to serve other value added services.
Recently, with the expansion of a service area of the mobile communication system and with the rapid increase of subscribers, addition of mobile services switching centers is being made. In addition, the value added services is increasing in the number of kinds to meet the various requests of the subscribers. In consequence, access from the mobile services switching centers to the home location resistor is rapidly increasing. Thus, the mobile communication system is constructed so that the use of the mobile communication system is effectively made after consideration is made about the maximum access traffic in the home location register.
However, when unexpected number of access to the home location register happen, congestion is happened in the home location registers. With the increase of the subscribers and with the increase of kinds of the value added services, the congestion will frequently happen. Thus, the congestion must be dissolved to supply an efficient communication service in the mobile communication system.
Though restricting call origination for a predetermined time dissolves the congestion, the restricted mobile terminals repeat call generation. As a result, other congestion happens in base stations and the mobile services switching centers. Thus, it is undesirable to restrict call origination.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a home location register controller that can deal with congestion in a home location register without restriction of access to the home location register.
It is another object of this invention to provide a method of controlling a home location register to deal with congestion in the home location register without restriction of access to the home location register.
It is still another object of this invention to provide a recording medium recording a program for controlling a home location register to deal with congestion in the home location register without restriction of access to the home location register.
Other object of this invention will become clear as the description proceeds.
On describing the gist of this invention, it is possible to understand that a home location register controller is used in a mobile communication system including a mobile services switching center, an active home location register connected to the mobile services switching center, and a standby home location register connected to the active home location register.
According to the gist of this invention, the home location register controller comprises a monitoring unit which is connected to the active home location register to monitor simultaneous access from the mobile services switching center to the active home location register and to produce a monitoring signal representative of the number of the simultaneous access. A control unit is connected to center to decide whether congestion is happened in the active home location register or not on the basis of the monitoring signal and to partially change destination of access produced by the mobile services switching center from the active home location register to the standby home location register.
According to another gist of this invention, a method is for controlling a home location register system having an active home location register and a standby home location register connected to each other. The home location register system is used in a mobile communication system including a mobile services switching center connected to said active home location register. The method comprising the steps of monitoring simultaneous access from the mobile services switching center to the active home location register to produce a monitoring signal representative of the number of the simultaneous access, deciding whether congestion is happened in the active home location register or not on the basis of the monitoring signal, and partially changing destination of access produced by the mobile services switching center from the active home location register to the standby home location register.
According to still another gist of this invention, a recording medium has a recorded program for controlling a home location register system having an active home location register and a standby home location register connected to each other. The home location register system is used in a mobile communication system including a mobile services switching center connected to the active home location register. The recorded program comprises a monitoring section for monitoring simultaneous access from the mobile services switching center to the active home location register to produce a monitoring signal representative of the number of the simultaneous access. A control section is related to the monitoring section for deciding whether congestion is happened in the active home location register or not on the basis of the monitoring signal to partially change destination of access produced by the mobile services switching center from the active home location register to the standby home location register.
REFERENCES:
patent: 5123111 (1992-06-01), Delory et al.
patent: 5594942 (1997-01-01), Antic et al.
patent: 5623532 (1997-04-01), Houde et al.
patent: 5953662 (1999-09-01), Lindquist et al.
patent: 4-347995 (1992-12-01), None
patent: 6-209489 (1994-07-01), None
Foley & Lardner
NEC Corporation
To Doris H.
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