Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1999-09-23
2003-09-16
Chin, Vivian (Department: 2682)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S552100
Reexamination Certificate
active
06622027
ABSTRACT:
The invention is directed to a method for setting up a communication connection in a communication network composed of a plurality of network communication nodes and to an address converter for supporting the connection setup.
DESCRIPTION OF THE PRIOR ART
Communication networks are composed of a plurality of switching nodes networked with one another to which communication terminal equipment are connectible directly or via further devices. Examples of such communication networks are the public switched telephone network (PSTN), data networks or mobile radio telephone networks such as the GSM mobile radio telephone system (Global System For Mobile Communications).
A subscriber of one of these networks has a communication terminal equipment and would like to set up a communication connection to a second communication terminal equipment. To accomplish this, it is necessary to select an operator-specific telephone number in the communication terminal equipment. This operator-specific telephone number serves, for the switching node, as addressing (or symbolic identification) information for the second communication terminal equipment.
Given the likely increase in the plurality of communication networks operating in parallel in the future and the possible switch of a subscriber from one communication network of a network operator to a different communication network of a different network operator, the determination of operator-specific telephone numbers becomes increasingly complex.
EP-A-0 751 691 discloses an intelligent network (IN). Telephone numbers of an area (area code) of the one operator are dialed with TCAP messages and the STP. The operator forwards the call to the intelligent network. A data bank entry is read, and the number has an operator-specific telephone number added to it. The call is subsequently rerouted via a different operator.
Beller, M. J., “Call Delivery to Portable Telephones away from Home Using the Local Exchange Nethwerk” Communications—Rising to the Heights, Denver, Jun. 23-26, 1991, Vol. 2, pages 948-953, Institute of Electrical and Electronics Engineers, presents a service (800 method) of an intelligent network. Analogous to a 0130 service, a data bank is selected via a service control point (SCP) of an intelligent network. The intelligent network is dialed via a telephone number (service access code, 800). The SCP communicates with a switch via protocols transaction capability application part (TCAP).
Eske-Christensen, B., et al., “Basis für flexiblere Telecom-Dienste”, Funkschau, Vol 63, No. 12, May 31, 1991, pages 54-59, discloses an intelligent network (IN). The service user selects the access to the intelligent network, a digital switching technology, with a telephone number (0130). I.e., the service user first selects a service switching point (SSP) with the dialing of the telephone number (0130) in order to use the service of the intelligent network. With this dialing-in, the SSP of the intelligent network communicates a TCAP message to the SCP of the intelligent network. The SCP drives a data bank, and the telephone number that is read out is communicated to the SSP with a TCAP message via the STP (signal transfer point). The SSP subsequently implements the numeral conversion and through-connects the route.
GB-A-2 299 913 likewise discloses an intelligent network. Here, the intelligent network is used in order to enable call re-directions, for example for overloaded long distance connections. A subscriber dials the number of a second subscriber. The call is redirected with TCAP and SCP.
SUMMARY OF THE INVENTION
The present invention is therefore based on the object of specifying a method and an address converter (or “symbol converter”—the “address” may be construed broadly as any symbolic representation of an identifier) that makes it easier for the calling subscriber to set up a communication connection to a further subscriber. This object is achieved according to the method for establishing a communication link and the address converter described below.
Given the inventive method, a first communication terminal equipment transmits a first address information to a first switching node for setting up a communication connection, whereby first identification features are contained in the first address information. The first switching node interprets the first address information with the first identification features and derives a second address information from it for addressing a first address converter. At least parts of the first identification features are communicated to the first address converter. Second identification features that serve the purpose of addressing a second switching node are generated from the first identification features. The communication connection between the first and second switching node is set up with the second identification features.
The inventive method enables the connection setup even given incomplete address information for operator-specific telephone numbers. Further, the chance of equality between operators of different communication networks is enhanced since subscriber-specific particulars suffice for the connection setup without exact network knowledge.
According to an advantageous development of the invention, the first address converter determines the address of an applicable second address converter from the first identification features, with this second address converter generating at least parts of the second identification features after corresponding signaling. In the sense of an intelligent network, a specialization of the address converters to specific functions can be facilitated, since not all first address converters need maintain a complete data set for the address conversion.
It is thus advantageous that a plurality of first address converters are arranged in the communication network according to geographical points of view. These first address converters are responsible for a specific area in one or more communication networks. These first address converters can be integrated as independent units in the sense of a SCP or in a switching node.
It is also advantageous that a plurality of second address converters are arranged in the communication network according to subscriber-classifying points of view. Such subscriber-classifying points of view are, for example specific services (Fleurop, Emergency Service), specific fields (Hotels) or specific subscriber groups (Siemens employees, residents of a city neighborhood). It is thus possible for independent vendors or operators to achieve improved reachability for such services, fields or subscriber groups.
According to another advantageous development of the invention, the first and/or second address converters are configured as devices of various sub-networks of an overlapping communication network or as independent units in the sense of intelligent networks. These address converters serve as bridges between the networks in the addressing. The expanded addressing can be economically offered when it is made accessible to the calling subscribers of a plurality of communication networks.
The second identification features advantageously contain operator-specific telephone numbers or subscriber addresses. A direct connection setup without further format conversion is thus possible with these second identification features.
The first identification features contain, for example, street addresses or vehicle identifiers of the subscriber of the second communication terminal equipment or other characteristics that can be easily remembered by a person. The structure of the first identification features should assure a fast selection of the address converters and an adequately good limitation for a search algorithm.
An advantageous configuration of the invention provides that the first or second address converter communicates the second identification features for a setup of the communication connection to the first switching node. The function of the address converters can thus be essentially limited to the translation of the addresses and, pot
Gabe Axel
Menzel Christian
Chin Vivian
Siemens Aktiengesellschaft
Tran Tuan
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