Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1999-04-21
2003-03-25
Urban, Edward F. (Department: 2685)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S411000, C455S433000, C455S074100
Reexamination Certificate
active
06539224
ABSTRACT:
In message systems with a message transmission link between a message source and a message sink, transmission and reception devices are employed for message processing and transmission, whereby the message processing and message transmission can ensue in a privileged transmission direction (simplex mode) or in both transmission directions (duplex mode). The message processing is analog or digital. The message transmission over the long-distance transmission link is wire-bound or ensues wirelessly on the basis of various message transmission methods FDMA (Frequency Division Multiple Access), TDMA (Time 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 denotational content (information) as well as for the physical representation (signal). Different signal forms can occur despite the same denotational content of a message—i.e., the same information. Thus, for example, a message relating to a subject matter can be transmitted in the following forms.
(1) an image,
(2) spoken word,
(3) written word,
(4) encrypted word or image.
The type of transmission according to 1 . . . 3, is thereby normally characterized by continuous (analog) signals, whereas discontinuous signals (for example, pulses, digital signals) generally arise in the type of transmission according to form 4.
Proceeding from this general definition of a message system, the present invention is directed to a method for controlling the logon of cordless mobile parts at cordless base stations of universal telecommunication systems, particularly DECT mobile parts at DECT base stations of CAP-specific telecommunication systems.
International application WO 95/05040 shows and describes (FIGS. 3 through 8 with the respectively appertaining description) a scenario for a “Universal Mobile Telecommunication System” (UMTS), which is essentially concerned with involving picocell-related cordless telecommunication systems for example (I): DECT systems; Digital Enhanced Cordless Telecommunication, (see (1):
Nachrichtentechnik Elektronik
42 (1992, January/February, No. 1, Berlin, D E, U. Pilger “
Struktur des DECT
-
Standards
”, pages 23 through 29 in combination with
ETSI Publication ETS
300175-1 . . . 9, October 1992; (2):
Telcom Report
16 (1993), No. 1, J. H. Koch, “
Digitaler Komfort für schnurlose Telecommunication—DECT
-
Standard eröffnet neue Nutzungsgebiete
”, pages 26 and 27; (3): tec February 1993—Das technische Magazin von Ascom “
Wege zur universellen mobilen Telecommunication
”, 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); and (II): DECT/GAP systems; Generic Access Profiles (see
ETSI Publication prETS
3000444, April 1995, Final Draft) in to a higher-ranking network infrastructure for example ISDN, PSTN, GSM and/or satellite networks; Integrated Services Digital Network, (see the publication “
Nachrichtentechnik Elektronik
, Berlin 41-43, Part: 1 through 10, P1: (1991) No. 3, pages 99 through 102; P2: (1991) No. 4, pages 138 through 143; P3: (1991) No. 5, pages 179 through 182 and No. 6, pages 219 through 220; P4: (1991) No. 6, pages 220 through 222 and (1992) No. 1, pages 19 through 20; P5: (1992) No. 2, pages 59 through 62 and (1992) No. 3, pages 99 through 102; P6: (1992) No. 4, pages 150 through 153; P7: (1992) No. 6, pages 238 through 241; P8: (1993) No. 1, pages 29 through 33; P9: (1993) No. 2, pages 65 through 97 and (1993) No. 3, pages 129 through 135; P10: (1993) No. 4, pages 187 through 190;”) Public Switched Telecommunication Network, Global System for Mobile Communication (see
Informatik Spektrum
14 (1991) June, No. 3, Berlin, D E, A. Mann, “
Der GSM
-
Standard—Grundlage für digitale europ{umlaut over (d)}ische Mobilfunknetze”, pages
137 through 152 for accesses (see
ETSI Publication
“CTM Access Profile (CAP)” prETS 300XXX, September 1996) under CTM points of view (Cordless Terminal Mobility; see ETSI Publications (1): “
IN Architecture and Functionality for the support of CTM
”, Draft Version 1.10, September 1995; (2): “
Cordless Terminal Mobility (CTM) —Phase
1
, Service Description”, Draft DE/NA-
010039, Version 6, Oct. 2, 1995).
This can be achieved by a DECT base station fashioned as DECT repeater. In a universal mobile telecommunication system, DECT is mainly understood as a “network access technology” for mobile communication services (see publication (presentation) of A. Elberse, M. Barry, G. Fleming on the topic, “
DECT Data Services—DECT in Fixed and Mobile Networks
”, Jun. 17/18, 1996, Hotel Sofitel, Paris, pages 1 through 12 and Summary) and not as a network.
International application WO 94/10785 discloses a method for the interconnection of transmission and reception devices of a cordless communication system to form a communication-capable unit, whereby cordless mobile parts are logged on at cordless base stations by logon procedures sequencing via air interfaces according to an air interface-specific protocol, and whereby logon-specific data are stored in the cordless mobile parts during this logon (FIGS. 4 through 12 with the respectively appertaining figure description).
In the framework of the CTM access profile (CAP) standardized by ETSI, it is intended that the fixed part (Fixed Part; for example the DECT base station) can, as needed, modify access authorization-specific parameters for example, the IPUI identification (International Portable User Identification; see
ETSI Publication ETS
300175-6, October 1992, Ch. 6.2), the PARK identifier (Portable Access Rights Key; see
ETSI Publication ETS
300175-6, October 1992, Ch. 6.1) and the PLI identifier (Park Length Indicator; see ETSI Publication ETS 300175-6, October 1992, Ch. 6.1) that are stored in a non-volatile memory (for example, EEPROM) in the mobile part (Portable Part PP; for example, the DECT mobile part) already logged on at the fixed part (see WO 94/10785). To that end, the fixed part initiates a re-logon procedure (re-subscription procedure) according to FIG. 1. According to the DECT standard (see
ETSI Publication
300175-5, October 1992), the sub-procedures shown in FIG. 1, “authentification of the fixed part” (see
ETSI Publication ETS
300175-5, October 1992, Ch. 13.3.3), “key allocation” (see
ETSI Publication ETS
300175-5, October 1992, Ch. 13.6) and “authentification of the mobile part” (see
ETSI Publication ETS
300175-5, October 1992, Ch. 13.3.1), are thereby implemented with the MM messages recited in
ETS
300175-5, October 1992, Ch. 6.3.6 With the sub-procedure “authentification of the fixed part”, the fixed part FP must legitimize or, respectively, identify itself as fixed part that is authorized to initiate a re-subscription procedure. What this is particularly intended to prevent is that unauthorized persons (“hackers”) can initiate a re-subscription procedure from an arbitrary fixed part. The access rights according to
ETS
300175-5, October 1992, Ch. 13.5.1 are assigned with the sub-procedures of “key allocation” and “authentification of the mobile part”.
Up to now, it was standard that the data (for example, the afore-mentioned identifications) stored in the preceding logon were all deleted—both in the fixed part FP as well as in the mobile part PP. The result thereof was that the logon procedure, i.e. all sub-procedures shown in FIG. 1, had to be completely repeated.
European reference EP-0 336 079 A2 and Great Britain reference GB-2 289 828 A respectively disclose a method for controlling the logon of cordless mobile parts at cordless base stations of universal telecommunication systems wherein a personal identifier (password, ID) stored in the cordless mobile part can be modified
Beckers Michael
Kamperschroer Erich
Kordsmeyer Martin
Schmitz Georg
Bell Boyd & Lloyd LLC
Davis Temica M.
Siemens Aktiengesellschaft
Urban Edward F.
LandOfFree
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