Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1995-04-19
1997-04-08
Bost, Dwayne D.
Telephonic communications
Audio message storage, retrieval, or synthesis
455 332, H04Q 722
Patent
active
056195524
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an arrangement and a method for subscriber location management among a group of radio networks comprising at least a first and a second radio network in which at least some of the subscribers may roam away from the first radio network, which is the subscribers' home network, and register in the second radio network over the radio path.
BACKGROUND OF THE INVENTION
The mobile telephone networks of the prior art have typically had their own independent location management systems, which have not communicated with other radio networks in respect of location management. This has been the case even if several radio systems have been combined to form a single radio network. In GSM systems, location management is standardized so that all GSM systems of different operators can communicate with each other as regards location management. In GSM systems, the location management of a mobile phone is performed by the home network of this mobile phone. The situation is more complicated when several mobile telephone networks of different kinds are combined, e.g. a GSM-type radio network and private radio networks such as PMR-type (Private Mobile Radio) networks. Networks of different types have usually not been able to communicate with each other regarding location management.
A disadvantage of these prior art solutions is that each network requires its own location management system. This is naturally very expensive, as each radio system must have its own location management registers, which are continuously aware of the location of each subscriber.
BRIEF DESCRIPTION OF THE INVENTION
The object of the invention is to provide such an advantageous location management method and system for subscribers of interconnected radio systems by which the problems with the solutions of the prior art are avoided.
This new type of arrangement for location management among radio networks is achieved with the arrangement according to the invention, which is characterized in that the subscriber database of a third radio network, which does not belong to the same group of radio networks as said first and second radio network, and in which the subscribers of said first and second radio network cannot register, is arranged to maintain in a centralized manner the location data of all the subscribers that have roamed away from their home network and registered in the second radio network at least with an accuracy of a radio network.
The new type of method for performing location management among radio networks is achieved with the method according to the invention, which is characterized in that the subscriber database of a third radio network, which does not belong to the same group of radio networks as said first and second radio network, and in which the subscribers of said first and second radio network cannot register, maintains in a centralized manner the location data of all the subscribers that have roamed away from their home network and registered in the second radio network at least with an accuracy of a radio network.
The invention is based on the idea that the location and subscriber data management in interconnected radio systems can be performed, if necessary, by a centralized network element. The system may comprise local registers for location and subscriber data management; these registers maintain location and subscriber data locally within the area of the subscriber's home network. When the subscriber roams outside the service area of his home network, the subscriber location management is performed by a location management register which is located outside the home network, possibly in another radio network.
An advantage of the system and method according to the invention for subscriber location management among radio networks is that it allows construction of mobile telephone networks which do not comprise location and/or subscriber data management of their own, nor registers for this purpose. It is thus possible to utilize the properties and registers of the location
REFERENCES:
patent: 4833701 (1989-05-01), Comroe et al.
patent: 5090050 (1992-02-01), Heffernan
Karppanen Arto
Talarmo Reino
Tuohino Markku
Bost Dwayne D.
Chernoff Michael B.
Nokia Telecommunications Oy
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