Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
1998-09-04
2001-06-26
Ngo, Ricky (Department: 2664)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S337000, C370S344000, C370S347000
Reexamination Certificate
active
06252860
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method and system for improving the degree of utilization of telecommunication channels in locally concentrated, asynchronous, wireless telecommunication systems wherein in each telecommunication system, for a first telecommunication connection to be set up according to a hybrid multiple access method containing the FDMA principle, a free, not-yet-occupied FDMA frequency is occupied with priority and each further telecommunication connection following the first telecommunication connection is set up with priority on the same FDMA frequency.
DESCRIPTION OF THE PRIOR ART
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 transmission, 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; and
3) the message transmission over the remote transmission path is wireless (e.g., according to various 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 that stands both for the meaning content (information) and for the physical representation (signal). Signals can be, for example,
(1) images
(2) spoken words
(3) written words
(4) encoded words or images.
Telecommunication systems of the type sketched above are, for example, DECT systems (Digital European Cordless Telecommunication; cf. (1): Nachrichtentechnik Elektronik 42 (1992) January/February, no. 1, Berlin, Germany; U. Pilger: “Struktur des DECT-Standards,” pages 23 to 29, in connection with ETS 300 175-1 . . . 9, October 1992; (2): telcom Report 16 (1993), no. 1, J. H. Koch: “Digitaler Komfort füir 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) or GAP systems (Generic Access Profile; ETSI publication prETS300444, April 1995, Final Draft, ETSI, FR), which, for example, can be constructed according to the representation in FIG.
1
.
According to the DECT/GAP standard, as shown in
FIG. 1
, a maximum of 12 connections according to the TDMA/FDMA/TDD method (Time Division Multiple Access/Frequency Division Multiple Access/Time Division Duplex) can be set up to a DECT/GAP base station BS, in parallel to DECT/GAP mobile parts MT
1
. . . MT
12
, 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 connection can thereby be internal and/or external. Given an internal connection, two mobile parts registered to the base station BS, e.g. the mobile part MT
2
and the mobile part MT
3
, can communicate with one another. For the setting up of an external connection, the base station BS is connected to a telecommunication network TKN, e.g. in wire-bound fashion 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 fashion 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
, one can 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 the base station BS has, as in the case of the Gigaset 951 (Siemens wireless telephone; cf. telcom Report 16 (1993), no. 1, pages 26 and 27), only one terminal to the telecommunication terminal unit TAE or, respectively, to the private branch exchange NStA, only one external communication can be set up. If the base station BS has, as in the case of the Gigaset 952 (Siemens wireless telephone; cf. telcom Report 16 (1993), no. 1, pages 26 and 27), two terminals to the telecommunication network TKN, then in addition to the external connection with the mobile part MT
1
an additional 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. Whereas the mobile parts MT
1
. . . MT
12
are operated with a battery or an accumulator, the base station BS, constructed as a wireless small switching installation, is connected to a 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 to 218, S. Althammer, D. Brückmann: “Hochoptimierte IC's für DECT-Schnurlostelefone,” the schematic circuit construction of the base station BS and of the mobile part MT. According to
FIG. 2
, the base station BS and the mobile part MT includes 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 way shown. In the radio part FKT, the known means, such as the transmitter SE, receiver EM and synthesizer SYN, are contained. In the signal processing means SVE, among other things a coding/decoding means CODEC is contained. The central control unit ZST includes 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, a signal control part SST and a digital signal processor DSP, connected to one another in the way 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 is fashioned 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, in relation to the mobile-part-specific signal control part BMC, takes over additional switching functions.
The principle of operation of the circuit units described above is described for example in the reference cited above, Components 31 (1993), no. 6, pages 215 to 218.
The described 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 to 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 include an operator interface (functional units drawn in with broken lines in FIG.
2
), consisting, of for example, an input means EE fashioned as a keyboard, a display means AE fashioned as a display, a speech/hearing means SHE fashioned as a hand apparatus with microphone MIF and earpiece HK, and a sound call bell TRK.
The mobile part MT includes the operator interface, possible as an option in the base station BS, with the above-described operating elements belonging to this operator interface.
FIG. 3
shows a cellular DECT/GAP multisystem CMI (Cordless Multicell Integration) in which (as assumed at the beginning) several of the above-described DECT/GAP systems TKS, each with a base station BS and one/several mobile part(s) MT, are present in concentrated fashion (in the
Bell Boyd & Lloyd LLC
Ngo Ricky
Siemens Aktiengesellschaft
Tran Phuc
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