Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-12-09
2001-01-30
Le, Thanh Cong (Department: 2749)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S435100
Reexamination Certificate
active
06181938
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to the establishing of calls in a telecommunication network comprising dual or multi mode terminals, for instance DECT/GSM terminals that can be used like cordless terminals in a private network exchange and like a cellular dual mode terminal in a cellular mobile telephone network. Within the scope of the present application terminals of that description are called dual mode terminals (DMT) and the users correspondingly DMT subscribers.
Cordless telephone systems—like DECT (Digital European Cordless Telephone), which is described in recommendation 300 175 of ETSI—support subscriber mobility in a very limited fashion. Within the scope of the present application, such a network is called a network supporting limited subscriber mobility.
Mobile telephone networks, like the European GSM/DCS system, well support subscriber mobility outdoors. Within the scope of the present application, such a network is called a network supporting extensive subscriber mobility. Cordless PABX:s support subscriber mobility in areas that are typically limited to indoor spaces. Furthermore, the PABX provides the subscriber with exchange services.
Dual or multi mode terminals DMT are developed with a view to subscriber mobility both indoors and outdoors. Such a DMT terminal requires new qualities of the mobile telephone network, e.g. for numbering, mobility management and call routing of the DMT subscriber. Known mobile networks cannot handle subscriber mobility in a system comprising both networks that support limited subscriber mobility and networks that support extensive subscriber mobility.
BRIEF SUMMARY OF THE INVENTION
Accordingly, it is the primary object of the present invention to establish a call originating in or terminating at a DMT terminal. It is an intermediate object of the invention to perform the numbering and mobility management of the DMT subscriber in such a way that it will be possible for the subscriber to move between the private network and the mobile telephone network and be reached by one subscriber number. The objects of the invention can be achieved by the methods and systems as characterized in the appended independent claims. The preferred embodiments of the invention are shown in the dependent claims.
The invention is based on the idea that the DMT subscriber is assigned a primary dialling number, e.g. a network exchange number (a so called Direct Dialling In number) or a so called personal number. Within the scope of the present application that number is called the primary number. The primary number is used for calling the DMT subscriber regardless of whether the subscriber is located in the area of a network exchange or in the mobile telephone network. The intelligent network technology supports (supplements) the mobility management of the mobile telephone network by providing routing service (e.g. to a company exchange (PABX)). When the terminal switches from one mode to another, this information is updated in the service control point (SCP) of the intelligent network (IN) that stores information for instance in the service data point (SDP) connected to it. A call terminating at the DMT subscriber terminal is routed to a network given by the intelligent network (a mobile telephone network or a private network) which in its turn routes the call to the subscriber terminal according to the prevailing protocol in the respective network.
The advantage of the method and system of the invention is among other things that the same DMT terminal can be used both in an exchange area and in a mobile telephone network. When the DMT subscriber is in the area of a private network exchange, a private network tariff can be applied. One subscriber number only is needed for contacting a DMT subscriber. The invention requires relatively few changes to be made in the GSM system. The necessary changes can be restricted to a clearly defined area, e.g. to the mobile telephone exchange of the GSM system.
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Salmela Seija
Tuohino Markku
Cong Le Thanh
Kolster Oy AB
Pillsbury Madison & Sutro LLP
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