Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-04-22
2001-04-17
Matar, Ahmad (Department: 2642)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C340S870030, C379S211010, C455S039000
Reexamination Certificate
active
06219551
ABSTRACT:
The invention relates to an intelligent network service for transmitting a call request and establishing a connection to a subscriber for which a plurality of terminal equipment numbers have been determined.
Rapid development of telecommunication has enabled the teleoperators to provide the users with a large variety of different services. Network architecture providing developed services is termed as intelligent network IN. The intelligent network architecture may be applied to most telecommunication networks, such as public switched telephone networks PSTN, mobile and packet switched public data networks PSPDN, as well as to ISDN and B-ISDN networks (integrated services digital network, broadband-ISDN). Regardless of the network technology, the aim of the intelligent network architecture is to facilitate development, control and management of new teleservices. ITU-T (International Telecommunication Union—Telecommunication Standardisation Sector) has specified the intelligent network in generally known Q.1200-series recommendations.
A service switching point SSP contains call management and service selecting functions. It is able to detect the service requests of the intelligent network. A service control point SCP contains the service programs that are used for producing the services provided by the intelligent network. A service data point SDP is a database that contains subscriber- and network-specific data used by the service programs of the SCP for producing individual services. An intelligent peripheral IP provides special functions, such as announcements, as well as voice and multiple-choice recognition.
A Basic Call State Model BCSM defined in association with the intelligent network describes different stages of call processing and identifies the points where call processing may be interrupted for activating an IN service. It detects those points (detection point) in a call and connection process at which the IN service logic entities may interact with basic call and connection management features.
The intelligent network architecture may be applied to almost all networks, whereby the commonest use is establishing a speech connection between two or more subscribers. It is a general principle that call establishment takes place under control of the intelligent network, whereby signalling takes place both in the intelligent network and in the network
etworks connected to it via the SSP, and between the networks, whereas the actual speech connection is switched as usual directly from a terminal equipment to another in said network
etworks via a service switching function SSF related to one or more services. The subscriber may be e.g. a subscriber of the GSM, NMT or fixed network, or an extension of an exchange. The extension may also be a cordless extension, in which case the subscriber may be connected to the exchange by means of a telephone operating in accordance with the CT2 or DECT specification. In cordless exchanges (wireless-PBX, cordless-PBX), part of the subscriber lines are replaced with a radio connection. Cordless exchanges have both fixed and cordless extensions. Cordless exchanges provide the users of cordless telephones with a mobility option, which is determined by the coverage area of the cordless base stations. The coverage area is typically limited to the inside of an office building.
The DECT system may generally be regarded as a PCS system (Personal Communication System), in which one and the same cordless telephone may be used for establishing calls both at home and in the office provided that the user has first registered to the exchange of his current location area. By combining a DECT telephone and a GSM telephone and later e.g. a DCS telephone into one terminal equipment, that is, a so-called multimode telephone, the user may use the DECT mode of the telephone at home and in the office, and thus make use of usually more economical call tariffs. When the mode of the telephone is switched manually, or the mode is automatically switched into the GSM mode, the user may utilize a high degree of mobility offered by the GSM system.
A prior art service provided by the intelligent network is a Follow-Me-Destination FMD, in which the subscriber of the service is given a number, and the incoming calls to this number are directed to the subscriber number registered by the subscriber in each case. Said subscriber number may be e.g. a subscriber number of a fixed network or a mobile subscriber number. The subscriber of the service may change this number any time or from any telephone. Another prior art service is a personal number UPT (Universal Personal Telecommunications), by means of which the user has an access to telephone services from any telephone connected to the public switched telephone network. Billing is always directed to charge the subscriber's bank account. Besides the standard outgoing call, the UPT service also provides location updating, by means of which the subscriber may direct the incoming calls to the physical telephone number determined by the subscriber. The user of the service first dials a service number, by means of which he activates the service. Thereafter, he gives his personal UPT number and a personal identification number PIN. Thereafter he may select an originating call, location updating or exit from the service. Another prior art service is Call Redirection, in which a call is routed to a new destination in case there is no answer, or the line is busy. Yet another prior art service is a Personal Number. In accordance with this service, a user who may have a plurality of terminal stations is provided with a personal subscriber number that consists of a prefix, which, in turn, nowadays usually directs the call to the intelligent network, and of an individual subscriber number. All the calls addressed to the personal number are routed to the service of the intelligent network, which retrieves from the database the numbers of the terminal equipments corresponding to the personal number. The call is directed from one terminal equipment to another in turn, and a speech connection is established to the equipment that answers the call request.
The above services provided by the intelligent network are attended by a few drawbacks. In Follow Me and Call Redirection services, the subscriber himself must inform the intelligent network of his current location, or otherwise the incoming call is routed to the number last registered by the subscriber. This number may be e.g. a fixed subscriber number, although the subscriber is currently located in the mobile network. In the Universal Personal Telecommunications service, the subscriber must also communicate his location, i.e. the subscriber number at which he can be reached, to the intelligent network. The problem of the Personal Number PN service is the fact that calling the physical subscriptions one after another requires plenty of time, particularly if the subscriber answers at the last number of the list of numbers. Therefore, this service is often supplied with a voice announcement informing the calling subscriber of the possible slowness of the call establishment. Besides, repeated signalling between the intelligent network and the destination network is required for each call attempt.
The object of the present invention is a method having none of the drawbacks disclosed above. The object is to establish a speech connection firstly with a minimum delay after the call request when the location of the called subscriber is unknown, and secondly, practically with no delay when the present location of the subscriber is known. The method must be practicable regardless of the fact whether the call is to be transmitted to a subscriber terminal or a DECT telephone connected to the fixed telephone network, or to a subscriber terminal connected to a mobile network, such as the GSM network. An object is particularly a method that is suited for use in connection with a multimode telephone, which is operable both in the GSM and in the DECT system.
The above objects are achieved with a
Hentila Marko
Peltola Hannu
Varsila Timo
Bui Bing
Burns Doane Swecker & Mathis L.L.P.
Matar Ahmad
Telefonaktiebolaget LM Ericsson
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