Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-09-23
2000-01-11
Dolinar, Andrew M.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455463, 455551, 455552, 455555, 455560, H04Q 726, H04Q 730, H04Q 738
Patent
active
060145633
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a radio system for a closed user group, to a device therefor and to a base station therefor.
BACKGROUND OF THE INVENTION
A radio system for a closed user group is known in Germany by the name of "Chekker". This radio system comprises several base stations which serve one radio cell each and are connected to a main system controller via "trunked system controllers" (see, for example, FIG. 6-2/2 on p.6, Chapter 6.2, in the "Mobilfunk Handbuch" by J. Kedaj et al, Neue Mediengesellschaft Ulm m.b.H., Edition May 1993). Accordingly, the "Chekker" radio system, which is designed to provide private mobile radio service within service areas with radii of about 50 km, has a complex infrastructure. A connection between a private mobile radio unit and the public telecommunication network is only possible via the main system controller.
A radio system for a closed user group which serves a small, single-cell area is described in DE 43 07 966 A1. A so-called transmission station is provided there which is connected to the public telecommunication network via switching equipment. This transmission station is similar in construction to a base station and a base station controller and, thus, complex and costly. Furthermore, the protocol executed between the transmission station and a radiotelephone is different from a standard protocol, so that the transmission stations must incorporate transceiver technology which is not standardized and, thus, cannot be procured at low cost.
DISCLOSURE OF INVENTION
It is an object of the invention to provide a radio system for a closed user group which is implemented by few and low-cost means.
According to a first aspect of the present invention, a radio system for subscribers forming a closed user group comprises radiotelephones which transmit respective subscriber identifications for establishing radio calls, at least one base station, and a device including means for connecting the at least one base station to a telecommunication network, a subscriber data base containing subscriber data for the closed user group to check whether the transmitted subscriber identification authorizes the subscriber to access the radio network, and base station control means which assign the authorized radiotelephone, at least for the duration of the radio call, to one of the base stations.
According to a second aspect of the present invention, a device for implementing a radio system for a closed user group, said radio system comprising at least one base station for radiotelephones which transmit respective subscriber identifications for establishing radio calls, said device including means for connecting the at least one base station to a communication network, a subscriber data base containing subscriber data for the closed user group to check whether the transmitted subscriber identification authorizes the subscriber to access the radio network, and base station control means which assign the authorized radiotelephone, at least for the duration of the radio call, to one of the base stations.
According to a third aspect of the present invention, a base station for implementing a radio system for a closed user group wherein radiotelephones transmit respective subscriber identifications for establishing radio calls, said base station including a device for providing the connection with a telecommunication network, said device including a subscriber data base, which contains subscriber data for the closed user group to check whether the transmitted subscriber identification authorizes a subscriber to access the radio network, and base station control means, which assign the authorized radiotelephone, at least for the duration of the radio call, to the base station.
The radio system thus includes a device by means of which at least one base station is connected to a telecommunication network. The device comprises a subscriber data base for checking subscribers' authorizations to access the radio system, and base station control means which assign an
REFERENCES:
patent: 5303289 (1994-04-01), Quinn
patent: 5365572 (1994-11-01), Saegusa et al.
patent: 5438608 (1995-08-01), Kojima
patent: 5459761 (1995-10-01), Monica et al.
patent: 5497411 (1996-03-01), Pellerin
patent: 5537474 (1996-07-01), Brown et al.
"Mobilfunk Handbuch" J. Kedaj et al, Fig. 6-2/2, Dec. 1993.
ALCATEL N.V.
Dolinar Andrew M.
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