Synchronizable base stations of a wireless multi-cell...

Details Synchronizable base stations of a wireless multi-cell... Synchronizable base stations of a wireless multi-cell...

1998-03-27

2001-08-07

Hsu, Alpus H. (Department: 2662)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S337000, C370S347000, C370S350000, C375S364000, C455S422100, C455S502000

Reexamination Certificate

active

06272118

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to base stations of a wireless multi-cell telecommunication system which are oriented to a particular telecommunication standard and which receive a time signal radio message sent by a time signal transmitter so that function executions of the base stations can be controlled synchronized in time.
2. Description of the Prior Art
A wireless multi-cell telecommunication system is a message system with a wireless message transmission path between a message source and a message sink for message processing and transmission, wherein the messages are processed in a cell related manner at every x-arbitrary location of the message system (mobile character of the message system) and transmitted in a cell-related or cell-overlapping manner. Whereas the cell-related transmission occurs exclusively wirelessly, the cell overlapping message transmission can be wireless/wire-bound or wireless. The message processing and transmission can thereby occur in either a preferred transmission direction (simplex mode) or in both transmission directions (duplex mode). Moreover, the message processing can be analog or digital. The message processing and the wireless message transmission preferably occurs according to various radio standards such as DECT, WCPS (American version of DECT), GSM including the derivative DCS1800, ADC (American version of GSM), JDC (Japanese version of GSM), etc. Other wireless types of transmission such as, for example, infrared transmission can also be utilized as wireless transmission technology in addition to the radio transmission.
“Message” is a higher ranking term that stands both for the denotational content (information) as well as for the physical representation (signal). For example, signals can represent
(1) images
(2) spoken words
(3) written words
(4) encrypted words or images.
For example, wireless multi-cell telecommunication systems of the type outlined above are cellular DECT systems (Digital European Cordless Telecommunication, see (1), Nachrictentechnik Elektronik 42 (1992) January/February, No. 1, Berlin, DE, U. Pilger, “Struktur des DECT-Standards”, pp. 23-29; (2) telecom report 16 (1993) No. 1, J. H. Koch, “Digitaler Komfort für schnurlose Telecommunikation-DECT-Standard eröffnet neue Nutzungsgebiete”, pp. 26 and 27; (3) tec 2/93-Das technishe Magazin von Ascom “Wege zur universellen mobilen Telekommunikation”, pages 35-42; (4) Funkschau (1194) No. 23, “Sprache und Daten schnurlos übertragen”, pp. 74-78) or GAP systems (Generic Access Profile; ETSI publication prETS 300 444, April 1995, Final Draft, ETSI, FR) that can be constructed according to the illustration in FIG.
1
. Such DECT/GAP-specific multi-cell telecommunication systems are summarized under the term “Cordless Multicell Integration (CMI)”. The GAP systems are a matter of specific DECT systems wherein, in particular, the interoperability of DECT voice applications is assured.
FIG. 1
shows a DECT/GAP radio area FB formed gap-free by, for example, three DECT/GAP radio cells FZ
1
. . . FZe. DECT/GAP base stations RFP
1
. . . RFP
3
(Radio Fixed Part) are arranged in the radio cells FZ
1
. . . FZ
3
in the cell centers. A first DECT/GAP base station RFP
1
is thus located in a first DECT/GAP radio cell FZ
1
, a second DECT/GAP base station is located in a second DECT/GAP radio cell FZ
2
and a third DECT/GAP base station RFP
3
is located in a third DECT/GAP radio cell FZ
3
. The three base stations are connected via a switching system VS to, for example, a public telephone network PSTN (Public Switched Telephone Network) and are thus connected to one another. EP-0 466 736 B1 discloses that the switching system VA is fashioned as private branch exchange PABX (Private Automatic Branch EXchange).
According to the subsequently published international application PCT/DE96/00933 (Publication Number WO 96/38990) that proceeded from German Patent Application P 19 519 966.9 in combination with U.S. Pat. No. 5,388,102 and the publication Nachrichtentechnik Elektronik, Berlin 41-42, Part 1 through 10, Part 1: (1991) No. 3, pages 99-102; Part 2: (1991) No. 4, pages 138-143; Part 3: (1991) No. 5, pages 179-182 and No. 6, pages 219-220; Part 4: (1991) No. 6, pages 220-222 and (1992) No. 1, pages 19-20; Part 5: (1992) No. 2, pages 59-62 and (1992) No. 3, pages 99-102; Part 6:(1992) No. 4, pages 150-153; Part 7: (1992) No. 6, pages 238-241; Part 8: (1993) No. 1, pages 29-33; Part 9: (1993), No. 2, pages 95-97 and (1993) No. 3, pages 129-135; Part 10: (1993) No. 4, pages 187-190, it is also possible to connect the three base stations RFP
1
. . . RFP
3
to the switching system VS via an S
0
bus. To that end, the switching system VS includes an interface SS that
(1) serves as network termination NT (Network Termination) when the switching system VS is fashioned as digital local exchange DOVS,
(2) serves as S
0
interface S
0
-SS when the switching system VS is fashioned as private branch exchange PABX,
(3) serves as private branch exchange PABX when the switching system VS is fashioned as local exchange OVS.
Within its radio cell FZ
1
. . . FZ
3
, each base station RFP
1
. RFP
3
can set up and maintain a maximum of 12 telecommunication connections in parallel to DECT/GAP mobile parts PP (Portable Part) via a DECT air interface designed for the frequency range between 1.88 and 1.90 GHz.
Proceeding from the publication Components 31 (1993), No. 6, pages 215-218, S. Althammer, D. Brückmann, “Hochoptimierte IC's für DECT-Schnurlostelefone”,
FIG. 2
shows the fundamental circuit structure of the base stations RFP
1
. . . RFP
3
of FIG.
1
. This is composed of a radio part FKT, a signal processing means SVE with a signal control part SST fashioned as time switch controller TSC with switching functions (switch functions), a signal shaping part SUT fashioned as CODEC and AD/DA converter, a clock generator TG, a microcontroller MIC, a line interface LSS to the switching system VS and a power supply SVG. All components are connected to one another in the illustrated way. The fundamental functioning of the circuit structure in combination with the mobile part is described, for example, in the above-cited publication.
For example, a total of 10 mobile parts PP are located in the radio area FB of
FIG. 1
, whereof a first mobile part PP
1
, a second mobile part PP
2
and a third mobile part PP
3
are allocated to the first base station RFP
1
, a fourth mobile part PP
4
, a fifth mobile part PP
5
, a sixth mobile part PP
6
, a seventh mobile part PP
7
and the third mobile part PP
3
are allocated to the second base station RFP
2
and an eighth mobile part PP
8
, a ninth mobile part PP
9
, a tenth mobile part PP
10
and the seventh mobile part PP
7
are allocated to the third base station RFP
3
. The third mobile part PP
3
is capable of telecommunication with the first base station RFP
1
as well as with the second base station RFP
2
because it is located in the overlap region of the first radio cell FZ
1
and the second radio cell FZ
2
. Analogous thereto, the seventh mobile part PP
7
, which is located in the overlap region of the second radio cell FZ
2
with the third radio cell FZ
3
, is capable of telecommunication with the second base station RFP
2
as well as with the third base station RFP
3
.
For the operation of the cellular DECT/GAP system of
FIG. 1
, in the sense of a mobile telecommunication, the realization of system-specific performance features such as roaming (moving through the radio area with a mobile part), handover (handing over a duplex radio connection “base station—mobile part”) within a cell (intra-cell handover) and in the overlap area of two radio cells (inter-cell handover) [sic], synchronization of the base stations existing in the system is assumed analogous to the cellular mobile radiotelephone system, for example according to the GSM standard (Groupe Spécicale [sic] Mobile or Global System for Mobile communication, see Informatik Spektrum 14 (1991) June, No. 3, Berlin, DE, A.

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