Telecommunications – Radiotelephone system – Including private cordless extension system
Reexamination Certificate
1998-11-10
2001-10-09
Hunter, Daniel (Department: 2684)
Telecommunications
Radiotelephone system
Including private cordless extension system
C455S434000, C455S437000, C455S552100
Reexamination Certificate
active
06301483
ABSTRACT:
TECHNICAL FIELD
The present invention relates to the area of private telecommunication networks comprising means for handling cordless terminals, such as mobility servers handling the connections set up to and from cordless terminals in cordless telephone networks. These devices also handle the services that cordless terminals are allowed to use in private cordless networks. More particularly the present invention relates to the automatic updating of to which means for handling cordless terminals a cordless terminal belongs.
DESCRIPTION OF RELATED ART
In the world of private networks comprising private branch exchanges, where each private branch exchange also comprises cordless terminals in combination with ordinary terminals in the form of ordinary telephone sets, it is customary to provide a home data base in each exchange for handling of cordless terminals belonging to the exchange as well as a visitor data base for registering cordless terminals visiting the exchange but belonging to another exchange.
There also exist mobility servers arranged for handling the functions available to cordless terminals. In WO96/21330 and WO96/21329 mobility servers according to the state of the art are described. The mobility servers according to-these documents are in the form of extensions or adjunct nodes to private branch exchanges and handle communications with cordless terminals connected to these private branch exchanges via radio exchanges. These mobility servers comprise means for handling functionality for cordless terminals belonging to the servers but also means for handling functionality for terminals visiting a mobility server.
When assigning a cordless terminal to a private branch exchange or a mobility server, the terminal gets assigned a number within a number series dedicated to that exchange or mobility server. If such a terminal temporarily moves to another area served by another mobility server or exchange within the same private network, that other mobility server immediately knows where the home of the terminal is through just seeing that the number or identity of the terminal is within the number series of the first mobility server or exchange. In this way the other mobility server or exchange knows what mobility server or exchange to contact in order to obtain such things as service profile or authorization keys etc. The problem with the system as outlined above is that once a terminal has received a number it is difficult to make any changes of home data base. If the user of a terminal belonging to one area covered by a mobility server or an exchange moves to an area covered by another mobility server or exchange a lot of unnecessary information will be transmitted between these two mobility servers or exchanges in order to receive such things as service profiles and authorization keys for setting up connections. This is an inefficient use of the network. In order to change home data base for obviating above mentioned problems one has to fetch the terminal and program another number into it, which other number then is within the number series of the new mobility server or exchange. Needless to say this is also cumbersome and inefficient. Another disadvantage is that it is not possible to let one home data base register more terminals than the number series includes, which unduly limits the system.
WO95/15664 describes a system of the type radio in the local loop. When, in this system, a subscriber unit is registered in its home access network, its home access number is transmitted to the subscriber unit for storage there. When the unit moves to a visited access network and registers there, the subscriber unit transmits the home access number to the visited access network for contact with the home access network.
The document WO96/34502 describes the setting up of a call from a fixed network to a cordless network. The cordless network includes a home location register.
WO97/03529 describes a system where an area of where to page a pager is automatically updated by tracking the mobility pattern of the pager. What is updated is a list of in which cells where to first page the pager. This list contains all the cells where the pager has been most frequently encountered. A pager is then paged in the cells of the list in descending order. When a pager has been for a while in a cell not on the list, that cell is put on the list after the updating, if the pager has been paged in that cell more frequently than in at least one cell on the list.
None of the documents cited are related to the above outlined problems associated with fixed numbers.
There therefore exists a need for an easier way to change the mobility server or means for handling cordless terminals to which a cordless terminal belongs, when the user of the terminal has moved to the area of another mobility server on a permanent basis.
SUMMARY
The present invention thus attacks the problem of how to update to which means for handling cordless terminals a certain terminal belongs, when the user of that terminal has moved on a more or less permanent basis from an area covered by an old means for handling cordless terminals to an area covered by a new means for handling cordless terminals.
This problem is solved by determining a measure of the time a cordless terminal has been located in a geographical area of the new means for handling cordless terminals and setting the cordless terminal as belonging to the new means for handling cordless terminals if the measure exceeds a certain threshold.
One object of the present invention is thus to obtain a private telecommunication network, a means for handling cordless terminals in such a private telecommunication network, a server for connection in such a private telecommunication network as well as methods for updating to which means for handling cordless terminals such a cordless terminal belongs.
This object is achieved by a private telecommunication network, a means for handling cordless terminals and a server in such a network comprising means for determining a measure of the time a cordless terminal has been located in a geographical area of a new means for handling cordless terminals and means for setting the cordless terminal as belonging to the new means for handling cordless terminals if the measure exceeds a threshold.
This object is also achieved by a method of updating to which means for handling cordless terminals such a terminal belongs, where the method comprises the steps of determining a measure of the time the cordless terminal has been located in a geographical area of a new means for handling terminals and setting the cordless terminal as belonging to the new means for handling cordless terminals if the measure exceeds a threshold.
Another object of the present invention is to obtain a method of registering cordless terminals in a private telecommunication network, which method facilitates easier updating of the means for handling cordless terminals to which a terminal belongs.
This object is achieved by a method comprising the steps of registering, in a first register means, which means for handling cordless terminals said cordless terminal belongs to, and registering, in a second register means provided in or for the means for handling cordless terminals indicated in the first register means, the cordless terminal as belonging to said means for handling cordless terminals.
One advantage of the invention is that the network itself analyses the most suitable node to which a cordless terminal belongs and automatically registers the terminal there. No manual registration is necessary
Another advantage of the invention is that numbers or identities for cordless terminals can be associated with a home node without having to take regard to a limited number series. The identity is thus no limitation for assigning a home node.
Another advantage of the invention is that a change of home node can be performed while the cordless terminal is being used.
The expression determining a measure of the time a cordless terminal is located in a geographical area is inten
Burns Doane Swecker & Mathis L.L.P.
Hunter Daniel
Telefonaktiebolaget LM Ericsson (publ)
Tran Pablo
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