Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1997-11-20
2002-08-06
Trost, William (Department: 2683)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S525000, C455S067150, C455S462000, C455S427000, C455S554100, C370S331000
Reexamination Certificate
active
06430413
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a mobile radio receiver for cellular radio telecommunications systems according to the precharacterizing clause of patent claim 1.
Two of the currently most powerful wire-free telecommunications systems are the mobile radio system based on the GSM Standard (Global System for Mobile Communication; see Informatik Spektrum [Information Spectrum] 14 (June 1991), No. 3, Berlin; A. Mann: “Der GSM-Standard—Grundlage für digitale europäische Mobil-funknetze” [The GSM Standard—Basis of European digital mobile radio networks]; pages 137 to 152) and the cordless telephone system based on the DECT Standard (Digital Enhanced (previously: European) Cordless Telecommunications; cf. (1): Nachrichtentechnik Elektronik [Electronic Information Technology] 42 (January/February 1992), No. 1, Berlin; 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): Siemens Components 31 (1993), No.
6
; S. Althammer and D. Brückmann: “Hochoptimierte IC's für DECT-Schnurlostelefone [Highly optimized ICs for DECT cordless telephones]”, pages 215 to 218; (3): telecom report 16 (1993), No. 1, J. H. Koch: “Digitaler Komfort für schnurlose Telekommunikation —DECT-Standard eröffnet neue Nutzungsgebiete [Digital convenience for cordless telecommunications—DECT Standard opens up new fields of use]”, pages 26 and 27), both of which transmit radio messages inter alia using the TDMA method (Time Division Multiple Access).
However, the present invention is not limited either to these two telecommunications systems or to the TDMA transmission method. The invention thus also extends to those systems which are described in the document TIB-R09067 (5)-P. Bauer-Trocheris: “UMTS-Integrator für die mobile Kommunikation—ein Ausblick auf die Mobilfunklandschaft nach dem Jahr 2000 [UMTS integrator for mobile communications—a summary of the mobile radio situation after the year 2000]”, Report on the Convention “European Mobile Radio, 5th annual meeting of German and European mobile radio industry, FIBA Congresses, Munich, Feb. 24 to 26 1993”.
The GSM mobile radio system is a digital cellular system in which, according to
FIG. 1
(see tec February 1993—The technical magazine Ascom “Wege zur universellen mobilen Telekommunikation” [Ways for universal mobile telecommunication], pages 35 to 42) a large number of base stations BST
1
. . . BST
3
are split into cells in a cellular supply region. The cells and the base stations BST
1
. . . BST
3
are connected to one another and to the outside world via a mobile switching center MSC
1
, MSC
2
(Mobile Switching Center). For an efficient network design, usually a number of these mobile switching centers MSC are combined in a public state-based mobile network PLMN
1
, PLMN
2
(Public Land Mobile Network). Furthermore, the mobile switching centers MSC
1
, MSC
2
are linked to a public telephone network PSTN (Public Switched Telephone Network). A mobile radio part MFT
1
. . . MFT
3
, from which a call is normally passed, is, as a rule, operated by that base station with which the best radio link can be maintained. In GSM mobile radio, the users under some circumstances move at high speed in the cellular supply region. This leads to a number of mobile radio cells being traversed during a call. In order to ensure an interruption-free handover from one adjacent cell to another adjacent cell (seamless handover), special protocols are required between the mobile radio part and the base station.
The DECT-specific cordless telephone system is a digital system which, according to
FIG. 1
(cf. tec February 1993—Technical Magazine from Ascom “Wege zur universellen mobilen Telekommunikation [Ways for universal mobile telephone communication]”, pages 35 to 42) can be used in the private area (for example house, apartment, garden etc.), in the small public area (for example companies, office building etc.) and as a telepoint application.
The basic structure of the cordless telephone system comprises a base station BS (FP=Fixed Part with FT=Fixed Termination) and a mobile part MT (PP=Portable Part with PT=Portable Termination) with the capability for telecommunications with the base station BS. This basic structure can be extended in accordance with the DECT Standard in such a manner that up to twelve such mobile parts MT are assigned to a single base station BS.
FIG. 3
shows such a cordless telephone system STS, in which a maximum of 12 links using the TDMA/FDMA/TDD method (Time Division Multiple Access/Frequency Division Multiple Access/Time Division Duplex) are set up on one DECT base station BS in parallel to DECT mobile parts MT
1
. . . MT
12
via a DECT radio interface designed for the frequency band between 1.88 and 1.90 GHz. The
figure 12
results from a number “k” of time slots or telecommunications channels (k=12) available for duplex operation of a DECT system. The links may in this case be internal and/or external. In the case of an internal link, 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. For setting up an external link, the base station BS is connected to a telecommunications network TKN, for example in wire-based form via a telecommunications access unit TAE or a private branch exchange NStA is connected to a wire-based telecommunications network or, in accordance with WO 95/05040, in wire-free form as a repeater station to a higher level telecommunications network. In the case of the external link, it is possible to communicate with a mobile part, for example with the mobile part MT
1
, via the base station BS and the telecommunications access unit TAE, and for a private branch exchange NStA to communicate with a subscriber in the telecommunications network TKN. If, as in the case of the Gigaset 951 (Siemens cordless telephone, cf. telecom report 16, (1993), issue 1, pages 26 and 27 BS—the base station) has only one connection to the telecommunications access unit TAE or the private branch exchange NStA, then only one external link can be set up. If—as in the case of the Gigaset 952 (Siemens cordless telephone, cf. telecom report 16, (1993), issue 1, pages 26 and 27)—the base station BS has two connections to the telecommunications network TKN, then, in addition to the external link to the mobile part MT
1
, a further external link is possible from a wire-based telecommunications terminal TKE connected to the base station BS. In this case, it is in principle also feasible for a second mobile part, for example the mobile part MT
12
, to use the second connection for an external link, instead of the telecommunications terminal TKE. While the mobile parts MT
1
. . . MT
12
are operated using a battery or a rechargeable battery, base station BS, which is designed as a small cordless switching system, is connected via a mains connecting unit NAG to a power network SPN.
The cordless telephone system according to
FIG. 3
is preferably used in the private area, according to FIG.
2
.
In the small public area—in accordance with FIG.
2
—a plurality of such cordless telephone systems according to
FIG. 3
can be operated as a cellular system on a private branch exchange PABX (Private Automatic Branch Exchange), the private branch exchange PABX controlling a plurality of base stations A-BS, B-BS, C-BS and, if required, supporting a handover from one base station to another.
FIG. 2
also shows six mobile parts MT
a
. . . MT
f
which are assigned to the three base stations A-BS, B-BS, C-BS. This results in a cellular cordless telephone system in which the telecommunications link as a rule passes via that base station A-BS, B-BS, C-BS with which the mobile part MT
a
. . . MT
f
has the best radio contact.
Based on the document “Nachrichtentechnik Elektronik [Electronic Information Technolog
Merker Andreas
Wedi Christoph
Schiff & Hardin & Waite
Siemens Aktiengesellschaft
Sobutka Philip J.
Trost William
LandOfFree
Mobile radio receiver for cellular radio telecommunications... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mobile radio receiver for cellular radio telecommunications..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mobile radio receiver for cellular radio telecommunications... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2948312