Telecommunications – Radiotelephone system – Including public cordless extension system
Reexamination Certificate
1997-06-18
2001-02-13
Maung, Nay (Department: 2744)
Telecommunications
Radiotelephone system
Including public cordless extension system
C455S011100, C455S426100, C455S464000, C370S315000
Reexamination Certificate
active
06188908
ABSTRACT:
TECHNICAL FIELD
The invention concerns a cellular radio system built up of existing facilities which perform switching functions and provide a number of service features, as well as base stations and cordless terminals.
BACKGROUND OF THE INVENTION
Cellular mobile radio networks which expand the telephone service of wired networks to mobile subscribers are already known in the state of the art. Telephone systems with so-called cordless telephones have great significance for use in the private sector. The generally known GSM network expands the services offered by the introduced ISDN network to the mobile areas. Said network is designed for high compatibility with the ISDN network.
The other country-wide mobile radio systems which provide an expansion to the radio area of the services offered by existing wired networks are described in more detail in the following.
Cordless telephones offer a service which is available above all in the area of the subscriber's main station. It enables the telephone terminal to be connected by radio instead of by cable to a fixed station up to 300 m outside of the building or 50 m inside of the building. To that end the fixed station and the telephone terminal as the mobile part are each equipped with a transmitting and a receiving facility. The current DECT (Digital Enhanced Cordless Telecommunications) standard describes the protocols in a cordless telecommunications system for voice and data transmission. This system is also interesting for broad application in private branch exchanges. The DECT standard does not provide for any mobility management. The subscriber is mostly supplied inside of buildings, while in multi-cell networks such as for example the GSM network, the subscribers are predominantly reached outside of buildings. Several expansion steps are known with DECT installations. There are so-called one-cell systems which cover the supply area with only one fixed station. Due to the established low transmission capacity and the high attenuation inside of buildings, one-cell systems can be imagined for private internal use in buildings.
Multi-cell systems allow using the DECT service in larger areas, such as in one or more buildings within a private company territory (from: “An Overview of Mobile Data Communications”) by B. Walke et al; it+ti 5/93 Information Technology and Technical Informatics 35 (1993); p. 12 to 25).
The previously cited multicell systems however require a controller for switching the different base stations to a TK installation since, as already mentioned, no mobility management is provided by the DECT standard. Even a direct link to a network requires a line-side connected logic circuit.
SUMMARY OF THE INVENTION
This means therefore an additional expense when installing a cellular radio system in an existing telecommunications facility, or in an existing telecommunications network. Accordingly it is the task of the present invention to create a cellular radio system in a way to enable its implementation in an existing telecommunications facility without the need to make major changes therein. The invention fulfills this task via a cellular radio system with a facility which performs switching functions and which makes available a plurality of service features, with a plurality of base stations that each have cordless terminals assigned to them, and at least one of which is connected to the facility, wherein each base station makes available a plurality of radio channels, and wherein a connection between neighboring base stations via one of the radio channels is used to access the facility via those base stations to which the cordless terminal is not assigned.
The present invention demonstrates that a cellular network can be established in spite of reduced costs and without the need to make large changes for the new installation in the facility. It is furthermore advantageous that the range can be extended with very cost-effective means.
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“Mobile Datenkommunikation—Eine Übersicht” by Walke, et al. In Informationstechnik und Technische Informatik 35 (1993) 5, pp. 12-25.
Alcatel
Maung Nay
Ware Fressola Van der Sluys & Adolphson LLP
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