Telecommunications – Radiotelephone system – Special service
Reexamination Certificate
2000-03-15
2003-11-04
Trost, William (Department: 2683)
Telecommunications
Radiotelephone system
Special service
C455S412100, C455S466000, C379S088120
Reexamination Certificate
active
06643505
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method for transmitting messages that are specific to “MWI Service” in telecommunication Networks, particularly in hybrid DECT/ISDN-Specific Telecommunication Networks.
In message systems having a message transmission path between a message source and a message sink, transmitting and receiving devices are used for processing and transmitting messages, in which devices
1) the message processing and transmission can be accomplished in a preferred direction of transmission (simplex mode) or in both directions (duplex mode),
2) the message processing is analog or digital,
3) messages are transmitted over the telecommunication path wirelessly on the basis of diverse message transmission methods FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access) and/or CDMA (code Division Multiple Access), for instance in accordance with radio standards such as DECT, GSM, WACS, or PACS, IS-54, IS-95, PHS, PDC, etc., (cf. IEEE Communications Magazine, January 1995, pp. 50-57; DD Falconer et al: “Time Division Multiple ACCESS Methods for Wireless Personal Communications”), and/or are transmitted over wire.
“Message” is an overarching term referring both to the meaningful content (information) and the physical representation (signal). Despite the same content of a message—i.e. the same information—different signal forms can occur. Thus, a message relating to a subject matter 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 type of transmission in accordance with images, spoken words, and written words is normally characterized by continuous (analog) signals, while in the type of transmission in accordance with encrypted words or image discontinuous signals (e.g. impulses, digital signals) usually occur.
Based on this general definition of a message system, the present invention relates to a method for transmitting messages which are specific to “MWI service” in telecommunication networks, particularly in hybrid DECT/ISDN-specific telecommunication networks.
Hybrid telecommunication networks include network containing various wireless and/or wirebound telecommunication subnetworks or subsystems.
Telecommunication systems of the above described type include DECT systems [Digital Enhanced (previously: European) Cordless Telecommunication; cf. (1): Nachrichten Elektronik 42 (1992) Jan/Feb, Nr. 1, Berlin, Del.; U. Pilger “Struktur des DECT Standards”, pp. 23-39 together with ETSI Publication ETS 300175-1 . . . 9, October 1992; (2): Telcom Report 16 (1993), Nr. 1, J. H. Koch: “Digitaler Komfort für schnurlose Telekommunikation—DECT Standard eroffnete neue Nutzungsgebiete”, pp. 26 and 27; (3): tec 2/93—The technical magazine by Ascom “Wege zur universellen mobilen Telekommunikation”, pp. 35-42; (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
to
3
with description)] or GAP systems (Generic Access Profile; cf. ETSI Publication ETS 300444, December 1995, ETSI, FR), which can be constructed according to the representation in
FIG. 1
, for example. The GAP standard is a subset of the DECT standard, whose object is to ensure the interoperability of the DECT air interfaces for telephone applications.
In accordance with the DECT/GAP standard, according to the representation in
FIG. 1
, at a DECT/GAP base station BS of a DECT/GAP system DGS a maximum of 12 connections can be set up, in accordance with the DECT/FDMA/TDD method, parallel to DECT/GAP mobile parts MT
1
. . . MT
12
via a DECT/GAP air interface that is laid out for the frequency range between 1.88 and 1.90 GHz. The number
12
derives from a number “k” of time slots or telephone channels, that are available for the duplex mode of the DECT GAP system DGS (k=12). The connections can be internal or external. Given an internal connection, two mobile parts, for instance mobile parts MT
2
and MT
3
, that are registered at the base station BS can communicate with one another. For the construction of an external connection, the base station BS is connected to a telecommunication network TKN, for instance in a wirebound manner via a telecommunication terminal unit TAE, or a private branch exchange NStA is connected to a cablebound telecommunication network or in accordance with PCT Patent Application No. 95/05040 to a higher-ranking telecommunication network wirelessly as a repeater station. Given external connection, using a mobile part, for instance mobile part MT
1
, it is possible to comnmunicate with a subscriber in the telecommunication network TKN via the base station BS and the telecommunication terminal unit TAE or private branch exchange NStA. If the base station BS has only one connection to the telecommunication terminal unit TAE or to the private branch exchange NStA, as in the case of the gigaset 951 (Siemens cordless telephone, see telecom report 16 (1993), vol. 1, pp. 26 and 27), then only one external connection can be set up. If the base station BS has two connections to the telecommunication network TKN,—as in the case of the gigaset 952 (Siemens cordless telephone, see telecom report 16, (1993), vol. 1, pp.26-27), then, besides the external connection to the mobile part MT
1
, an additional external connection is possible from a wirebound communication terminal device TKE that is connected to the base station BS. In principle, it is also imaginable that a second mobile part, for instance mobile part MT
2
, would use the second connection for an external connection, instead of the communication terminal device TKE. Whereas the mobile parts MT
1
. . . MT
2
are driven by a battery or an accumulator, the base station BS, which is implemented as a cordless advanced network processor system, is connected to a voltage network SPN via a network terminal device NAG.
FIG. 2
shows the principal circuit construction of the base station BS and the mobile part MT on the basis of the reference
Components
31 (1993), Vol. 6, pp. 215 to 218; S. Althammer, D. Brückmann. “Hochoptimierte ICs für DECT Schnurlostelefone”. The base station BS and the mobile part MT comprise a radio part FKT having an antenna ANT, which is allocated to transmission and reception of radio signals, as well as a signal processor SVE and a central control ZST, which are connected to one another in the manner depicted. The radio part FKT essentially contains the known systems such as transmitter SE, receiver EM and synthesizer SYN. The signal processing system SVE contains a coder/decoder CODEC, among other systems. The central control ZST comprises a microprocessor &mgr;P for both the base station BS and the mobile part MT, which has a program module that is constructed in accordance with the OSI/ISO layer model [see. (1): Instructional publications—Deutsche telecom, Issue 48, 2/1995, pp. 102 to 111; (2): ETSI Publication ETS 300175-1 . . . 9, October 1992], a signal control part SST, and a digital signal processor DSP, which are connected to one another as illustrated. Of the layers that are defined in the layer model, only the first four layers are shown, which are of immediate and critical importance to the base station BS and the mobile part MT. The signal control part SST is realized in the base station BS as a time switch controller TSC and in the mobile part MT as a burst mode controller BMC. The critical difference between the two signal control parts TSC, BMC is that the signal control part TSC that is specific to the base station BS assumes additional switching functions beyond those performed by the signal control part MT BMC that is specific to the mobile part.
The principal mode of operation of the above described circuit units is described in the above cited reference
Components
31 (1993), vol. 6, pp 215-218.
The described circuit construction according to
FIG. 2
is expanded in the base station BS and the mobile part MT by additional functional units accordin
Bell Boyd & Lloyd LLC
Siemens Aktiengesellschaft
Tran Congvan
Trost William
LandOfFree
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