Telecommunications – Radiotelephone system – Security or fraud prevention
Reexamination Certificate
2000-03-15
2003-03-11
Le, Thanh Cong (Department: 2749)
Telecommunications
Radiotelephone system
Security or fraud prevention
C455S403000, C455S410000, C455S462000, C455S463000, C455S554100, C455S555000
Reexamination Certificate
active
06532361
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for controlling access authorizations of telecommunication devices at cooperating stations in telecommunication systems with wireless telecommunication between the telecommunication devices and the cooperating stations.
2. Description of the Prior Art
In message systems with a message transmission link between a message source and a message sink, transmission and reception devices are employed for processing and transmission of the message wherein,
1) the message processing and message transmission can occur in a privileged transmission direction (simplex mode) or in both transmission directions (duplex mode),
2) and message processing is analog or digital,
3) the message transmission via the long-distance transmission link either is wire-bound or occurs wirelessly on the basis of various message transmission methods FDMA (Frequency Division Multiple Access) and/or CDMA (Code Division Multiple Access)—for example according to radio standards such as DECT, GSM, WACS or PACS, IS-54, PHS, PDC, etc. [see IEEE Communications Magazine, January 1995, pages 50 through 57; D. D. Falconer et al., “Time Division Multiple Access Methods for Wireless Personal Communication”].
“Message” is a higher-ranking term that stands both for the signification (information) and for the physical representation (signal). Despite the same signification of a message (i.e. a therefor a same information), different signal forms can occur. Thus, for example, a message relating to a subject matter can be transmitted:
(1) in a form of an image;
(2) as a spoken word;
(3) as a written word;
(4) as an encrypted word or image.
The transmission mode according to (1) . . . (3) is, thereby a normally characterized by continuous (analog) signals, whereas discontinuous signals (for example a, pulses, digital signals, etc) usually arise given the transmission mode according to (4).
Telecommunication systems in the above-defined field are, for example, DECT systems [Digital Enhanced (previously: European) Cordless Telecommunication; see (1): Nachrichtentechnik Elektronik 42 (1992) January/February No. 1, Berlin, DE; U. Pilger, “Struktur des DECT-Standards” pages 23 through 29 in conjunction with the ETSI Publication ETS 300175-1 . . . 9, October 1992; (2): Telcom Report 16 (1993), No. 1, J. H. Koch, “Digitaler Komfort für schnurlose Telekommunikation—DECT-Standard eröffnet neue Nutzungsgebiete”, pages 26 and 27; (3): tec 2/93—the technical magazine of Ascom, “Wege zur universellen mobilen Telekommunikation”, pages 35 through 42; (4): Philips Telecommunication Review, Vol. 49, No. 3, September 1991, R. J. Mulder, “DECT, a universal cordless access system”; (5) WO 93/21719 (
FIGS. 1 through 3
with appertaining description)] or GAP systems (Generic Access Profile; see ETSI Publication ETS 300444, December 1995, ETSI, FR) that, for example, can be constructed according to the illustration in FIG.
1
. The GAP standard is a subset of the DECT standard that has the job of assuring the interoperability of the DECT air interface for telephone applications.
According to the DECT/GAP standard, it is possible, in accordance with the illustration in
FIG. 1
, to set up at a DECT/GAP base station ES a maximum of 12 connections according to the TDMA/FDMA/TDD method (Time Division Multiple Access/Frequency Division Multiple Access/Time Division Duplex) in parallel to DECT/GAP mobile parts MT
1
. . . MT
12
over a DECT/GAP air interface configured for the frequency range between 1.88 and 1.90 GHz. The number 12 results from the number “k” of time slots or telecommunications channels k=12) available for the duplex mode of a DECT/GAP system. The connections here may be internal and/or external. When there is an internal connection, two mobile parts registered at the base station ES, for example the mobile part MT
2
and the mobile part MT
3
, can communicate with one another. To set up an external connection, the base station ES is connected to a telecommunications network TKN, for example, in line-bound form via a telecommunications connection unit TAE and/or a private branch exchange system NStA with a line-bound telecommunications network or, in accordance with WO 95/05040, in wireless form as a repeater station with a superordinate telecommunications network. When there is an external connection, it is possible to use a mobile part, for example the mobile part MT
1
, to communicate with a subscriber in the telecommunications network TKN via the base station BS, the telecommunications connection unit TAE or a private branch exchange system NStA. If the base station BS has—as in the case of the Gigaset 951 (Siemens cordless telephone, cf. Telcom report 16, (1993) Issue 1, pages 26 and 27)—only one connection to a telecommunications connection unit TAE and/or to the private branch exchange system NStA, only one external connection can be set up. If the base station ES has—as in a case of the Gigaset 952 (Siemens cordless telephone; cf. Telcom report 16, (1993), issue 1, pages 26 and 27)—two connections to a telecommunications network TKN, a further external connection, in addition to the external connection to the mobile part MT
1
, is possible from a line-bound telecommunications terminal TKE which is connected to the base station BS. In this context, it is also possible for a second mobile part, for example the mobile part MT
12
, to use the second port for an external connection, instead of telecommunications terminal TKE. While the mobile parts MT
1
. . . MT
12
are operated with a battery or an accumulator, the base station BS which is designed as a cordless small-scale exchange is connected to a voltage network SPN via a mains connection unit NAG.
FIG. 2
shows, on the basis of the publication Components 31 (1993), Issue 6, pages 215 to 218; S. Althammer, D. Brückmann: “Hochoptimierte IC's fur DECT-Schnurlostelefone”, the basic circuitry design of the base station BS and the mobile part MT. According to the latter, the base station BS and the mobile part MT have a radio component FKT with an antenna ANT which is assigned to transmitting and receiving radio signals, a signal processing device SVE and a central controller ZST which are connected to one another in the illustrated way. The radio component FKT basically contains known devices such as a transmitter SE, a receiver EM and a synthesizer SYN. The signal processing device SVE contains, inter alia, a coding/decoding device CODEC. The central controller ZST has a microprocessor &mgr;P both for the base station BS and for the mobile part NT, a program module PGM, set up according to the OSI/ISO layer model [cf. (1): Unterrichtsblätter—Deutsche Telekom, Vol. 48, 2/1995, pages 102 to 111; (2): ETSI publication ETS 300175-1 . . . 9, October 1992], a signal control component SST and a digital signal processor DSP, which are connected to one another in the way illustrated. Of the layers defined in the layer model, only the directly essential first four layers are illustrated for the base station BS and the mobile part MT. The signal control component SST is designed as a Time Switch Controller TSC in the base station BS and as a Burst Mode Controller BMC in the mobile part MT. The essential difference between the two signal control components TSC, BMC is that the base station-specific signal control component TSC additionally assumes switching functions in comparison with the mobile part-specific signal control component BMC.
The principal method of operation of the circuit units specified above is described for example in the publication Components 31 (1993), Issue 6, pages 215 to 218, cited above. The described circuitry design according to
FIG. 2
is supplemented in the base station BS and the mobile part MT in accordance with their function in the DECT/GAP system according to
FIG. 1
additional function units.
The base station BS is connected to the telecommunications network TKN via the signal processing device SVE and the telecommunicat
Bell Boyd & Lloyd LLC
Cong Le Thanh
Siemens AG
Tran Pablo
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