Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1995-12-22
1999-11-02
Bost, Dwayne D.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455465, 455461, 455414, H04Q 726
Patent
active
059786876
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for call establishment in a cellular radio system comprising a mobile services switching centre and a private branch exchange connected thereto, and a visitor location register for storing subscriber data on subscribers located within the service area of the mobile services switching centre. In particular, the invention pertains to a case where a subscriber located within the service area of a home private branch exchange wishes to make a call through the mobile services switching centre.
BACKGROUND OF THE INVENTION
Various cellular radio systems or mobile telephone systems are in use and presently being designed in which the geographical coverage area of the system is divided into smaller separate radio areas, i.e. cells, in such a way that when the radiotelephone or mobile telephone is located in a cell, it communicates with the fixed network through a fixed radio station incorporated in the cell. The mobile telephones belonging to the system can roam freely within the system area from one cell to another. One such system is the digital mobile telephone system GSM (Global System for Mobiles).
Cordless telephone (CT) systems, such as the DECT system, have recently come out on the market. The DECT system comprises a base station, which is normally based on access to an existing fixed telephone network. There are three main types of base stations: a residential base station, a base station connected to a private branch exchange in an office, and a telepoint base station.
Cordless telephone systems can also be connected to mobile telephone networks, for instance to the GSM system. The private branch exchange (PBX) of a cordless telephone system can be connected to the GSM system for example by employing DSS 1, Q.930-Q.940, 1989, Digital Subscriber Signalling System No. 1, Network Layer, User-Network Management, CCITT signalling supplemented with mobility management messages. The PBX of a cordless telephone system is connected to the switching centre of the GSM system so that the subscribers in the PBX can roam within the service area of the GSM system, and the subscribers in the PBX can make use of the mobility management procedures of the GSM system and roam within the service area of DECT systems associated with the GSM system. In such a case, mobile subscribers are attached to the PBX in accordance with the DECT radio path protocol ETS 300175, Radio Equipment and Systems (RES), Digital European Cordless Telecommunications (DECT), Common Interface, for instance. It has also been possible to connect fixed subscribers to the PBX, for example in accordance with the ISDN signalling protocol. In that event, calls originating from the GSM system or from a GSM-connected telephone network can also be routed to cordless, for instance DECT, subscribers located within the service area of the PBX.
In the prior art solution, wherein a subscriber located within the service area of a private branch exchange wishes to establish a connection, for example make a call or set up a telecommunications connection to another subscriber, register interrogation procedures in accordance with the GSM recommendations are performed, irrespective of the location of the called subscriber. FIG. 1 shows call establishment procedures in accordance with the prior art. In the figure, a subscriber CPP (Cordless Portable Part) in a private branch exchange PBX sends 101 a connection establishment request CC.sub.-- SETUP, by way of which the subscriber requests the PBX to establish a connection, to another subscriber. Upon receipt of the connection establishment request CC.sub.-- SETUP, the PBX sends 102 a service request DM.sub.-- SERVICE.sub.-- REQ to the mobile services switching centre MSC. Having received the service request, the MSC sends 103 an access request pertaining to mobility management, PROCESS.sub.-- ACC.sub.-- REQ, to the visitor location register VLR. The next step is the assignment of a temporary mobile subscriber identity TMSI.sub.-- ASSIGNMENT 104. This is followed b
REFERENCES:
patent: 5210786 (1993-05-01), Itoh
Bost Dwayne D.
Nokia Telecommunications Oy
Scott, Jr. Linwood C.
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