Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1999-01-22
2002-06-04
Vo, Nguyen T. (Department: 2682)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S465000
Reexamination Certificate
active
06400949
ABSTRACT:
In messaging systems with a message transmission path between a message source and a message destination, transmission and receiving apparatuses are used for message processing and transmission. Such apparatuses have the following features:
1) the message processing and message transmission can take place in a preferred direction of transmission (simplex operation) or in both directions of transmission (duplex operation),
2) the message processing is analog or digital,
3) the message transmission takes place in wireless fashion 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)—e.g. according to radio standards such as DECT, GSM, WACS or PACS, IS-54, PHS, PDC, etc. [cf. IEEE Communications Magazine, January 1995, pages 50 to 57; D. D. Falconer et al.: “Time Division Multiple Access Methods for Wireless Personal Communications”] and/or in wire-bound fashion.
“Message” is a higher-order concept that stands both for the meaning content (information) and for the physical representation (signal). Despite identical meaning content of a message—i.e., identical information—different signal forms can occur. Thus, for example a message relating to a single subject matter can be transmitted in the following forms:
(1) an image,
(2) as spoken word,
(3) as written word,
(4) as encrypted word or image.
The type of transmission according to forms (1), (2) and (3) is thereby normally characterized by continuous (analog) signals, while in the transmission type according to form (4) discontinuous signals (e.g. impulses, digital signals) usually arise.
On the basis of this general definition of a messaging system, the invention relates to a method for the setting up of telecommunication connections between telecommunication apparatuses in wireless telecommunication systems, in particular between DECT apparatuses of a DECT system
Telecommunication systems of the type defined above are for example DECT systems (Digital Enhanced (formerly: European) Cordless Telecommunication; cf. (1): Nachrichtentechnik Elektronik 42 (1992) Jan./Feb. no. 1, Berlin, DE; U. Pilger, “Struktur des DECT-Standards,” pp. 23 to 29, in connection with the ETSI publication ETS 300175-1 . . . 9, Oct. 1992; (2): Telcom Report 16 (1993), no. 1, J. H. Koch: “Digitaler Komfort für schnurlose Telekommunikation—DECT-Standard eröffnet neue Nutzungsgebiete,” pp. 26 and 27; (3): tec 2/93—Das technische Magazin von Ascom “Wege zur universellen mobilen Telekommunikation,” pp. 35 to 42; (4): Philips Telecommunication Review, vol. 49, no. 3, Sep. 1991, R. J. Mulder: “DECT, a universal cordless access system”; (5): WO 93/21719 (
FIGS. 1
to
3
with associated specification)) or GAP systems (Generic Access Profile; ETSI publication prETS 300444, April 1995, Final Draft, ETSI, FR), which can for example be constructed according to the representation in FIG.
1
.
According to the DECT/GAP standard, according to the representation in
FIG. 1
a maximum of 12 connections can be set up in parallel to DECT/GAP mobile parts MT
1
. . . MT
12
according to the TDMA/FDMA/TDD method (Time Division Multiple Access/Frequency Division Multiple Access/Time Division Duplex) via a DECT/GAP air interface designed for the frequency range between 1.88 and 1.90 GHz. The number 12 results from a number “k” of time slots or, respectively, telecommunication channels available for the duplex operation of a DECT/GAP system (k=12). The connections can thereby be internal and/or external. Given an internal connection, two mobile parts registered at the base station BS, e.g. the mobile part MT
2
and the mobile part MT
3
, can communicate with one another. For the setup of an external connection, the base station BS is connected with a telecommunication network TKN, e.g. in wire-bound form via a telecommunication terminal unit TAE or, respectively, a private branch exchange NStA with a wire-bound telecommunication network or, according to WO 95/05040, in wireless form as a repeater station with a higher-level telecommunication network. Given the external connection, it is possible using a mobile part, e.g. the mobile part MT
1
, to communicate with a subscriber in the telecommunication network TKN via the base station BS, the telecommunication terminal unit TAE or, respectively, private branch exchange NStA. If—as in the case of the Gigaset 951 (Siemens cordless telephone; cf. telcom report 16, (1993), vol. 1, pages 26 and 27—the base station BS has only one terminal to the telecommunication terminal unit TAE or, respectively, to the private branch exchange NStA, only one external connection can be set up. If—as in the case of the Gigaset 952 (Siemens cordless telephone; cf. telcom report 16, (1993), vol. 1, pages 26 and 27—the base station has two terminals to the telecommunication network TKN, then in addition to the external connection with the mobile part MT
1
a further external connection is possible from a wire-bound telecommunication terminal apparatus TKE connected to the base station BS. It is thereby also conceivable in principle that instead of the telecommunication terminal apparatus TKE a second mobile part, e.g. the mobile part MT
12
, uses the second terminal for an external connection. While the mobile parts MT
1
. . . MT
12
are operated with a battery or an accumulator, the base station, fashioned as a wireless small switching installation, is connected to a voltage network SPN via a network terminal apparatus NAG.
FIG. 2
shows, based on the reference Components 31 (1993), vol. 6, pp. 215 to 218; S. Althammer, D. Brückmann: “Hochoptimierte IC's für DECT-Schnurlostelefone,” the circuit design of the base station BS and of the mobile part MT. The base station BS and mobile part MT accordingly comprise a radio part FKT having an antenna ANT allocated for transmission and reception of radio signals, a signal processing means SVE and a central control unit ZST that are connected with one another in the manner shown. The radio part FKT essentially contains the known means such as transmitter SE, receiver EM and synthesizer SYN. In the signal processing means SVE, among other things there is a coding/decoding means CODEC. The central control unit ZST comprises, both for the base station BS and for the mobile part MT, a microprocessor &mgr;P with a program module PGM constructed according to the OSI/ISO layer model (cf. (1): Unterrichtsblätter—Deutsche Telekom, vol. 48, Febuary 1995, pp. 102 to 111; (2) ETSI publication ETS 300175-1 . . . 9, October 1992), a signal control part SST and a digital signal processor DSP that are connected with one another in the manner shown. Of the layers defined in the layer model, only the first four layers, immediately essential for the base station BS and the mobile part MT, are shown. The signal control part SST is fashioned in the base station BS as a time switch controller TSC and in the mobile part MT as a burst mode controller BMC. The essential difference between the two signal control parts TSC, BMC is that the base-station-specific signal control part TSC takes over additional switching functions in comparison with the mobile-part-specific signal control part BMC.
The manner of functioning in principle of the switching units described above is for example specified in the above-cited reference Components 31 (1993), no. 6, pp. 215-218.
The specified circuit design according to
FIG. 2
is supplemented with additional functional units in the base station BS and the mobile part MT, in accordance with their function in the DECT/GAP system according to FIG.
1
.
The base station BS is connected with the telecommunication network TKN via the signal processing means SVE and the telecommunication terminal unit TAE or, respectively, the private branch exchange NStA. As an option, the base station BS can also comprise an operator interface (functional units drawn in with broken lines in FIG.
2
), which consists for example of an input means EE fashioned as a keyboard, a dis
Bielefeld Ludger
Lenfort Christoph
Bell Boyd & Lloyd LLC
Siemens Aktiengesellschaft
Vo Nguyen T.
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