Telecommunications – Radiotelephone system – Emergency or alarm communication
Reexamination Certificate
1999-03-11
2002-05-21
Congle, Thanh (Department: 2684)
Telecommunications
Radiotelephone system
Emergency or alarm communication
C455S465000, C455S464000
Reexamination Certificate
active
06393268
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for making emergency calls in cordless telecommunications systems by means of a special emergency call transmission procedure wherein an emergency call connection is made regardless of whether the system contains mobile parts which do or do not have access authorization to base stations.
2. Description of the Prior Art
In telecommunications systems with a telecommunication transmission link between a telecommunication source and a telecommunication sink, transmission and reception units are used for processing and transmitting telecommunications, in such units:
1) it is possible for the processing and transmission of telecommunications to take place in a preferred transmission direction (simplex mode) or in both transmission directions (duplex mode);
2) the processing of telecommunications is analog or digital;
3) the transmission of telecommunications via the long-distance transmission link takes place wirelessly on the basis of various telecommunications transmission methods such as FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access) and/or CDMA (Code Division Multiple Access); for example, 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 Conmunications”] and/or in a wirebound fashion.
“Telecommunication” is a superordinate term which stands both for the signal contents (information) and for the physical representation (signal). Despite a telecommunication having the same content—that is to say the same information—different signal forms may occur. Thus, for example, a telecommunication relating to an object can be transmitted
(1) in the form of an image, or
(2) as a spoken word,
(3) an a written word,
(4) as an encrypted word or image.
The method of transmission according to (1) . . . (3) is normally characterized by continuous (analog) signals, whereas in the transmission method according to (4) discontinuous signals (e.g., pulses, digital signals) are usually produced.
Cordless telecommunications systems of the type defined above are, for example, DECT systems [Digital Enhanced (earlier: European) Cordless Telecommunication; cf. (1): Nachrichtentechnik Elektronik. [Telecommunications electronics] 42 (1992) January/February No. 1, Berlin, DE; U. Pilger “Struktur des DECT-Standards” [Structure of the DECT Standard], pages 23 to 29 in conjunction with the ETSI publication ETS 300175-1 . . . 9, October 1992; (2): Telecom Report 16 (1993), No. 1, J. H. Koch: “Digitaler Komfort für schnurlose Telekommunikation—DECT-Standard eröffnet neue Nutzungagobietes” [Digital convenience for cordless telecommunications—DECT standard opens up new fields of use], pages 26 and 27; (3): tec February, 1993—Das technische Magazin von Ascom “Wege zur universellen mobilen Telekommunikation” [The technical magazine from Ascom “Ways toward universal mobile telecommunications], page 35 to 42; (4): Philips Telecommunication Review, Vol. 49, No. 3, September 1991, R. J. Mulder: “DECT, a universal cordless access systems”; (5): WO 93/21719 (
FIGS. 1
to
3
with associated description)] or GAP systems (Generic Access Profile; ETSI publication prETS 300444, April 1995, Final Draft, ETSI, FR), which may be designed, for example, in accordance with the illustration in FIG.
1
.
The GAP Standard is a subset of the DECT Standard and has the function of ensuring the interoperability of the DECT air interface, in particular, for public telecommunications applications.
Where DECT/GAP systems are referred to below, private and/or public systems are thus meant.
According to the DECT/GAP standard, it is possible, in accordance with the illustration in
FIG. 1
, to set up at a DECT/GLP base station BS a maximum of 12 connections according to the TDMA/FDMA/TDD method (Time Division Multiple Access/Frequency Division Multiple Access/Time Division Duplex) in parallel to DECT/GAP mobile parts MT
1
. . . MT
12
over a DECT/GAP air interface configured for the frequency range between 1.88 and 1.90 GHz. The number
12
results from the number “k” of time slots or telecommunications channels (k=12) available for the duplex mode of a DECT/GAP system. The connections here may be internal and/or external. When there is an internal connection, two mobile parts registered at the base station BS, for example the mobile part MT
2
and the mobile part MT
3
, can communicate with one another. To set up an external connection, the base station BS is connected to a telecommunications network TKN, for example in line-bound form via a telecommunications connection unit TAE and/or a private branch exchange system NStA with a line-bound telecommunications network or, in accordance with WO 95/05040, in wireless form as a repeater station with a superordinate telecommunications network. When there in an external connection, it is possible to use a mobile part, for example the mobile part MT
1
, to communicate with a subscriber in the telecommunications network TKN via the base station BS, the telecommunications connection unit TAE or the private branch exchange system NStA. If the base station BS has, as in the case of the Gigaset 951 (Siemens cordless telephone, cf. Telcom report 16, (1993) Issue 1, pages 26 and 27), only one connection to the telecommunications connection unit TAE and/or to the private branch exchange system NStA, only one external connection can be set up. If the base station BS has, as in the case of the Gigaset 952 (Siemens cordless telephone; cf. Telcom report 16, (1993), issue 1, pages 26 and 27), two connections to the telecommunications network TKN, a further external connection, in addition to the external connection to the mobile part MT
1
, is possible from a line-bound telecommunications terminal TKE which is connected to the base station BS. In this context, it is in principle also conceivable for a second mobile part, for example the mobile part MT
12
, to use the second port for an external connection, instead of the telecommunications terminal TEE. While the mobile parts MT
1
. . . MT
12
are operated with a battery or an accumulator, the base station BS which is designed as a cordless small-scale exchange is connected to a voltage network SPN via a mains connection unit NAG.
FIG. 2
shows, on the basis of the publication Components 31 (1993), Issue 6, pages 215 to 218; S. Althammer, D. Brückmann: “Hochoptimierte IC's für DECT-Schnurlostelefone” [Highly optimized ICs for DECT cordless telephones] the basic circuitry design of the base station BS and of the mobile part MT. According to the latter, the base station BS and the mobile part MT have a radio component FKT (with an antenna ANT which is assigned to transmitting and receiving radio signals) a signal processing device SVE and a central controller ZST which are connected to one another in the illustrated way. The radio component PXT contains such known devices such as a transmitter SE, a receiver EM and a synthesizer SYN. The signal processing device SVE contains, inter alia, a coding/decoding device CODEC. The central controller ZST has a microprocessor &mgr;P, both for the base station BS and for the mobile part MT, with a program module PGM set up according to the OSI/ISO layer model [cf. (1): Instruction sheets—Deutsche Telekom, year 48, February 1995, pages 102 to 111; (2): ETSI publication ETS 300175-1 . . . 9, October 1992], a signal control component SST and a digital signal processor DSP, which are connected to one another in the way illustrated. Of the layers defined in the layer model, only the directly essential first four layers are illustrated for the base station BS and the mobile part MT. The signal control component SST is designed as a Time Switch Controller TSC in the base station BS and as a Burst Mode Controller BMC in the mobile part MT
Bell Boyd & Lloyd LLC
Congle Thanh
Corsaro Nick
Siemens Aktiengesellschaft
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