Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1998-09-14
2003-09-09
Ramakrishnaiah, Melur (Department: 2643)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S560000, C455S462000
Reexamination Certificate
active
06618595
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method for executing protocols between telecommunication apparatuses of wireless telecommunication systems and to a wireless telecommunication apparatus for implementing.
Wireless telecommunication systems of the type designated above are message systems with a remote transmission path between a message source and a message sink for message processing and message transition, in which
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 over the remote transmission path is wireless—e.g. according to various 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”).
“Message” is a higher-order term, which stands both for the meaning content (information) and also for the physical representation (signal). Signals can thereby represent for example
(1) Images
(2) Spoken words
(3) Written words
(4) Encrypted words or images.
FIG. 1
shows, as a representative of the large number of wireless telecommunication systems, a DECT/GAP system in which, according to the DECT/GAP standard (Digital 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 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—Das technische Magazin von Ascom “Wege zur universellen mobilen Telekommunikation”, pages 35 to 42; Generic Access Profile; cf. ETSI Publication prETS 300444, April 1995, Final Draft, ETSI, FR), at a DECT/GAP base station BS, via a DECT/GAP air interface designed for the frequency range between 1.88 and 1.90 GHz, a maximum of twelve connections according to the TDMA/FDMA/TDD method (Time Division Multiple Access/Frequency Division Multiple Access/Time Division Duplex) are set up parallel to DECT/GAP mobile parts MT
1
. . . MT
12
. The number
12
results from a number “k” of time slots or, respectively, telecommunication channels provided 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 extemal connection, the base station BS is connected with a telecommunication network TKN, e.g. 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 WO 95/05040, in wireless form as a repeater station with a higher-order telecommunication network. Given the external connection, with a mobile part, e.g. with the mobile part MT
1
, it is possible to communicate with a subscriber in the telecommunication network TKN via the base station BS, the telecommunication terminal unit TAE, or, respectively, the private branch exchange NSTA. If, as in the case of the Gigaset 951 (Siemens cordless telephone, cf. Telcom Report 16, 1993, no. 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, then 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, no. 1, pages 26 and 27), the base station BS 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 from a wire-bound telecommunication terminal apparatus TKE connected to the base station BS is possible. In principle, it is thereby also conceivable that a second mobile part, e.g. the mobile part MT
12
, instead of the telecommunication terminal apparatus TKE, uses the second terminal for an external connection. According to the subsequently published German Patent Application 195 45 762.5, the mobile parts MT
1
. . . MT
12
are operated in manual operation (normal operation) with a battery or an accumulator, and in hands-free operation are operated in connection with a charge station connected to a voltage network SPN. The base station, fashioned as a wireless small switching installation, is connected to the voltage network SPN via a network terminal apparatus NAG.
FIG. 2
shows, on the basis of the reference Components
31
(1993), no. 6, pages 215-218; 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 the mobile part comprise, according to the reference, a radio part FKT with an antenna ANT allocated for the transmission and reception of radio signals, a signal processing means SVE, and a central control unit ZST, connected with one another in the manner shown. In the radio part FKT, essentially the known means, such as transmitter SE, receiver EM, and synthesizer SYN, are contained. Among other things, a coding/decoding means CODEC is contained in the signal processing means SVE. The central control unit ZST comprises, both for the base station BS and also for the mobile part MT, a microprocessor &mgr;P, having a program module PGM constructed according to the OSI/ISO layer model (cf. (1): Unterrichtsblätter—Deutsche Telekom no. 48, 2/1995, pp. 102-111; (2): ETSI publication ETS 300175-1 . . . 9, Oct. 1992), a signal control part SST, and a digital signal processor DSP, connected with one another in the manner shown. Of the layers defined in the layer model, only the first three layers (layer-
1
. . . layer-
3
) immediately essential for the base station BS and the mobile part MT, as well as a fourth layer-
4
, designated as an IWU layer (InterWorking Unit) 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 relation to the mobile-part-specific signal control part BMC. The microprocessor &mgr;P is, according to the definition indicated above, a component of a microprocessor system.
The principle of the functioning of the switching units indicated above is described for example in the above-cited reference Components 31 (1993), no. 6, pages 215-218.
The specified circuit design according to
FIG. 2
is supplemented in the base station BS and the mobile part MT by additional functional units according to 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 a user interface (functional units drawn in with dotted lines in FIG.
2
), consisting for example of an input means EE fashioned as a keyboard, a display means AE fashioned as a display, a speech/hearing means SHE fashioned as a handset with microphone MIF and earpiece HK, as well as a tone call bell TRK.
The mobile part MT comprises the user interface, possible as an option in the base station BS, with the above-described operating elements belonging to this user interface.
The communication between two arbitrary communication terminal apparatuses (communication partners) is regulated by means of protocols defined in a standard/defined as a norm (standard
Bartsch Ulrich
Baumeister Josef
Beckers Michael
Biedermann Rolf
Euscher Christoph
Bell Boyd & Lloyd LLC
Ramakrishnaiah Melur
Siemens Aktiengesellschaft
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