Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-11-18
1999-05-04
Wolfe, Willis R.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455435, H04Q 738
Patent
active
059013532
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for updating subscriber data in a mobile communication system comprising a home database into which the subscriber data of subscribers of said home database and an age label informing of the previous updating of the data of each subscriber are stored, and the data of which home database is updated in response to updating requests of subscriber data, and a visitor database into which the data of subscribers registered to said visitor database and an age label informing of the previous updating of the data of each subscriber are stored, and the data of which visitor database is updated in response to updating requests of subscriber data.
The invention shows a method for recovering the data of visiting subscribers between mobile communication systems and/or between nodes of the mobile communication network.
BACKGROUND OF THE INVENTION
Today there are various cellular radio or mobile telephone systems in use and being planned in which the geographical area covered by the system is divided into smaller separate radio areas, that is, cells in such a manner that a radio telephone or a mobile telephone in a cell communicates with a fixed network via a fixed radio station placed in the cell. The mobile telephones in the system can move freely in the area of the system from one cell to another. One such system is the digital mobile telephone system GSM (Global System for Mobiles).
In connection with cellular radio networks, it is known that a home location register stores the location information and subscriber data of the radio telephones registered to the network constantly into a memory means, such as RAM, from which the data will volatilize for example when the power supply of the home database is cut off, and at regular intervals into a non-volatile memory means, for example, into a hard disk on which the data is retained permanently. When the home database occasionally has to restart itself, the location information and subscriber data stored into the volatile memory will disappear. Then the home database has to request all the visitor databases of the mobile communication system, such as visitor databases of the radio telephone network, to perform the location updating of the subscribers registered to this home database in order that the home database would be able to update the location information of its subscribers. The home database needs the location information of the subscribers so that it is able to submit the correct location of the subscriber to the mobile services switching center intending to transmit a call to this subscriber.
Some prior art solutions are disclosed in GSM Specification "prETS 300 599, (GSM 09.02 version 4.9.0), November. 1994, European digital cellular telecommunications system (Phase 2); Mobile Application Part (MAP) specification, ETSI, p. 317 to 468."
According to the specification above, the recovery is performed after restarting the home location register (HLR) or the visitor location register (VLR).
The restart of the home location register HLR takes place in such a manner that the subscriber data of the home location register HLR in the visitor location register VLR is set to a state in which the visitor location register VLR transmits a registration request to the home location register HLR only when a certain impulse relating to the subscriber is received. This impulse can be a subscriber registration, an incoming call to a subscriber or a subscriber's call attempt. The information in the visitor location register/visitor database is the location information of the subscriber and data on the services permitted to and activated for the subscriber.
The restart of the visitor location register/database VLR takes place in such a manner that the data of the subscribers registered to the visitor location register is deleted from the visitor location register, whereby the visitor location register VLR sends a registration request to the home location register HLR when it detects a certain impulse relating to the subsc
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Nokia Telecommunications Oy
Vo Hieu T.
Wolfe Willis R.
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