Telecommunications – Radiotelephone system – Special service
Reexamination Certificate
2000-03-02
2003-09-23
Bost, Dwayne (Department: 2749)
Telecommunications
Radiotelephone system
Special service
C455S462000, C455S528000, C455S555000, C455S563000
Reexamination Certificate
active
06625443
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is directed to a method for user-controlled release of wireless telecommunication connections in wireless telecommunication systems, particularly DECT systems.
2. Description of the Related Art
In message systems having a message transmission link between a message source and a message sink, transmission and reception devices are employed for message processing and transmission, whereby
1) the message processing and message transmission can ensue in a privileged transmission direction (simplex mode) or in both transmission directions (duplex mode);
2) the message processing is analog or digital;
3) the message transmission ensues wirelessly via the remote transmission link on the basis of various message transmission methods FDMA (frequency division multiple access), TDMA (time division multiplex access) and/or CDMA (code division multiple access)—for example according to radio standards such as DECT, GSM, WACS or PACS, IS-54, IS-95, PHS, PDC, etc. [see IEEE Communications Magazine, January 1995, pages 50-57, D. D. Falconer et al, “Time Division Multiple Access Methods For Wireless Personal Communications”]—and/or ensues wire-bound.
“Message” is a higher-ranking term that stands both for the meaningful content (information) as well as for the physical representation (signal). Despite the same meaningful content of a message—i.e., the same information—different signal forms can occur. Thus, for example, a message directed to a subject can be transmitted
(1) in the 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 the above forms (1) . . . (3) is thereby normally characterized by continuous (analog) signals, whereas discontinuous signals (for example, pulses, digital signals) usually arise in the transmission according to the foregoing form (4).
Proceeding on the basis of this general definition of a message system, the invention is directed to a method for user-controlled release of wireless telecommunication connections in wireless telecommunication systems, particularly DECT systems.
Telecommunication systems of the species defined above are, for example DECT systems [digital enhanced (earlier: European) cordless telecommunication; see (1): Nachrichtentechnik Elektronik 42 (1992) January/February, No. 1, Berlin, Del.; U. Pilger “Struktur des DECT-Standards”, pages 23 through 29 in conjunction with 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 erö{umlaut over ( )}ffnet 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; 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 sub-set of the DECT standard which assigned the task of assuring the inter-operability of the DECT air interface for telephone applications.
According to the DECT/GAP standard and the illustration in
FIG. 1
, a maximum of twelve connections can be set up in parallel to DECT/GAP mobile parts MT
1
. . . MT
12
at a DECT/GAP base station BS over a DECT/GAP air interface designed for the frequency range between 1.88 and 1.90 GHz, being set up according to the TDMA/FDMA/TDD method (Time Division Multiple Access/Frequency Division Multiple Access/Time Division Duplex). The number 12 derives from a plurality “k” of time slots or, respectively, telecommunication channels (k=12) available for the duplex mode of a DECT/GAP system. The connections can thereby be internal and/or external. Given an internal connection, two mobile parts, for example, the mobile part MT
2
and the mobile part MT
3
, that are registered at the base station BS can communicate with one another. For a setup of an external connection, the base station BS is connected to a telecommunication network TKN, for example in line-bound form via a telecommunication terminal unit TAE or, respectively, a private branch exchange NSTA with a line-bound telecommunication network or, according to the published PCT patent application WO 95/05040, in wireless form as a repeater station with a higher-ranking telecommunication network. Given the external connection, communication can be carried out with a mobile part, for example with the mobile part MT
1
, via the base station BS, the telecommunication terminal unit TAE or, respectively, private branch exchange NSTA, communication being carried out with a subscriber in the telecommunication network TKN. When the base station BS—as in the case of the Gigaset 951 (Siemens cordless telephone, see Telcom Report 16, (1993) No. 1, pages 26 and 27)—has only one connection to the telecommunication terminal unit TAE or, respectively, the private branch exchange NSTA, then only one external connection can be setup. When the base station BS—as in the case of the Gigaset 952 (Siemens Cordless Telephone; see Telcom Report 16 (1993), No. 1 pages 26 and 27)—has two connections to the telecommunication network TKN, then a further external connection from a line-bound telecommunication terminal equipment TKE connected to the base station BS is possible in addition to the external connection to the mobile part MT
1
. It is thereby also fundamentally conceivable that a second mobile part, for example, the mobile part MT
12
, uses the second connection for an external connection instead of the telecommunication terminal equipment TKE. Whereas the mobile parts MT
1
. . . MT
12
are operated with a battery or an accumulator, the base station BS fashioned as a cordless, small-scale exchange is connected to a voltage network SPN via a network connection means NAG.
Proceeding from the publication components
31
(1993), No. 6, pages 215 through 218, S. Althammer, D. Brü{umlaut over ( )}ckmann, “Hochoptimierte IC's fü{umlaut over ( )}r DECT-Schnurlostelefone”,
FIG. 2
shows the fundamental circuit structure of the base station BS and of the mobile part MT. The base station BS and the mobile part M
2
accordingly comprise a radio part FKT with an antenna allocated for the transmission and reception of radio signals, a signal processing means SVE and a central controller ZST that are connected to one another in the illustrated way. It is essentially the known devices such as transmitter SE, receiver EM and synthesizer SYN that are contained in the radio part FKT. Among other things, the signal processing means SVE contains an encoding/decoding means CODEC. The central controller ZST comprises a microprocessor &mgr;P both for the base station BS as well as for the mobile part MT, the microprocessor &mgr;P having a program module PGM constructed according to the OSI/ISO layer model (see (1): Unterrichtsblä{umlaut over ( )}tter—Deutsche Telekom, Vol. 48, 2/1995, pages 102 through 111; (2): ETSI Publication ETS 300175-1 . . . 9, October 1992], a signal control part SST and a digital signal processor DSP that are connected to one another in the illustrated way. Of the layers defined by the layer model, only the first four layers which are immediately critical for the base station BS and the mobile part MT are shown. The signal control part SST is implemented in the base station BS as a time switch controller TSC and is implemented in the mobile part MT as a burst controller BMC. The critical difference between the two signal control parts TSC, BMC is comprised therein that the base station-specific signal control part TSC assumes additional switching functions compared to the mobile part-specific signal control part BMC.
The basic functioning of the circuit units recited above is describe
Beckers Michael
Kamperschroer Erich
Slonina Bernhard
Bell Boyd & Lloyd LLC
Bost Dwayne
Siemens Aktiengesellschaft
Ward Ronald J.
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