Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1998-10-01
2000-12-05
Hunter, Daniel S.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455438, 455445, H04Q 720
Patent
active
061578320
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to mobile communication systems, and especially to routing of a mobile-terminating call in mobile communication systems employing a so-called multinumbering scheme.
BACKGROUND OF THE INVENTION
In addition to conventional data transmission, modern mobile communication systems provide subscribers with various data transmission features. Mobile communication system services can be generally divided into Teleservices and Bearer Services. A bearer service is a telecommunication service that allows transmission of signals between user-network interfaces. For example, modem services are bearer services. In a teleservice the network also provides terminal equipment services. Speech services, telefax services and videotex services are major teleservices.
One mobile subscriber may typically have a right to various teleservices and network services which are here generally referred to as basic services. The subscriber may have access to a speech, telefax and data service. A mobile-terminating or mobile-originating call can thus require any of these basic services, wherefore the appropriate service should be indicated to the mobile network. For example, in a pan-European mobile communication system GSM, call set-up signalling transmitted by a mobile station contains information on the required basic service in a Bearer Capability Information Element GSM BCIE. The mobile network can thus select the appropriate basic service for mobile-originating calls. Also, ISDN (Integrated Services Data Network) supports this type of signalling: calls from the ISDN to the mobile network contain a similar information element ISDN BCIE that indicates the service required. In that case the subscriber has only one directory number for all services and the services required by the call are identified on the basis of the ISDN BCIE. This is known as Single Numbering Scheme.
Unfortunately the public switched telephone network (PSTN) does not support signalling of service data. Therefore when a call originates from or is routed via the PSTN, the information on the service type of the call will not be transmitted to the mobile station network. In that case, the mobile network should be informed in some other way of the basic service required by the call.
A prior art solution to this problem is a Multinumbering Scheme in which the number of directory numbers of a mobile subscriber is equal to the number of the services to which he/she wishes to receive incoming calls. A directory number is also known as a Mobile Subscriber ISDN Number (MSISDN). A subscriber may have a directory number for a speech service, a telefax service and a modem service, for example. In the multinumbering scheme, a calling subscriber dials one of the directory numbers of the mobile subscriber according to the desired service. In the GSM network, subscriber services are defined in a subscriber's home location register HLR where other subscriber data is also stored permanently. Also, information on the association between the directory numbers and the services of the subscriber is stored in the HLR. Furthermore, a specific BCIE indicating the type of a call and the network resources required for the call is also linked with the directory number (MSIDSN) in the HLR. The BCIE is described e.g. in GSM Recommendation 04.08, version 4.5.0, pp. 423 to 431. The HLR also contains an IMSI (International Mobile Subscriber Identity) used within the GSM system. The mobile subscriber has only one IMSI which is common to all the basic services.
The GSM system also has another subscriber register, a visitor location register VLR, into which some of the subscriber data is copied from the HLR when the subscriber is located within the area of the VLR.
FIG. 2 illustrates a call set-up of a mobile-terminating call in a GSM type of mobile communication system using a multinumbering scheme. In step 1, a call addressed to one of the subscriber's directory numbers arrives at a network gateway mobile switching centre GMSC which sends a rout
REFERENCES:
A copy of the International Search Report.
Hunter Daniel S.
Nguyen Thuan T.
Nokia Telecommunications Oy
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