Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
2000-04-26
2004-09-21
Pham, Chi (Department: 2667)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
C370S468000, C375S231000
Reexamination Certificate
active
06795427
ABSTRACT:
BACKGROUND OF THE INVENTION
Transmitting and receiving appliances (transmitters and receivers) are used in message systems having a message transmission path between a message source and a message sink for message processing and transmission, for those appliances in which
1) the message processing and message transmission can take place in a preferred transmission direction (simplex operation) or in both transmission directions (duplex operation);
2) the message processing is analog or digital; or
3) the message transmission via the long-distance transmission path is wire-based or is carried out without wires (for example by radio transmission) on the basis of various message transmission methods FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access) and/or CDMA (Code Division Multiple Access)—for example in accordance with radio standards such as DECT, GSM, WACS or PACS, IS-54, IS-95, PHS, PDC etc. [see 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 generic term that covers both the content (information) and the physical representation (signal). Despite a message having the same content—(i.e., the same information different signal forms may occur. Thus, for example, a message relating to one item may be transmitted
(1) in the form of a picture;
(2) as the spoken word;
(3) as the written word;
(4) as an encrypted word or picture.
The transmission types in situation (1) to (3) are, in this case, normally characterized by continuous (analog) signals, while the transmission type in (4) normally consists of discontinuous signals (for example pulses, digital signals).
Based on this general definition of a message system, the invention relates to a method for assessing transmission channels in telecommunications systems using wire-free telecommunication, as claimed in the precharacterizing clauses of patent claims 1, 6, 9 and 11, and to transceiver for assessing transmission channels in telecommunications systems using wireless telecommunication, as claimed in the precharacterizing clauses of patent claims 22, 27, 30 and 32.
Telecommunications systems using wireless telecommunication, as are presented and described in the following documents (1): Nachrichtentechnik Elektronik [Electronic information technology], Berlin 45, 1995, Issue 1, pages 10 to 14 and Issue 2, pages 24 to 27; P. Jung, B. Steiner: “Konzept eines CDMA-Mobilfunksystems mit gemeinsamer Detektion für die dritte Mobilfunkgeneration” [Concept of a CDMA mobile radio system with joint detection for the third mobile radio generation]; (2): Nachrichtentechnik Elektronik [Electronic information technology], Berlin 41, 1991, Issue 6, pages 223 to 227 and page 234; P. W. Baier, P. Jung, A. Klein: “CDMA—ein günstiges Vielfachzugriffsverfahren für frequenzselektive and zeitvariante Mobilfunkkanäle” [CDMA—a useful multiple-access method for frequency-selective and time-variant mobile radio channels]; (3): IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol. E79-A, No. 12, December 1996, pages 1930 to 1937; P. W. Baier, P. Jung: “CDMA Myths and Realities Revisited”; (4): IEEE Personal Communications, February 1995, pages 38 to 47; A. Urie, M. Streeton, C. Mourot: “An Advanced TDMA Mobile Access System for UMTS”; (5): telekom praxis, May 1995, pages 9 to 14; P. W. Baier: “Spread-Spectrum-Technik and CDMA—eine ursprünglich militärische Technik erobert den zivilen Bereich” [Spread spectrum technology and CMDA—an originally military technology takes over the civil area]; (6): IEEE Personal Communications, February 1995, pages 48 to 53; P. G. Andermo, L. M. Ewerbring: “A CDMA-Based Radio Access Design for UMTS”; (7): ITG Fachberichte [ITG Specialist Reports] 124 (1993), Berlin, Offenbach: VDE Verlag ISBN 3-8007-1965-7, pages 67 to 75; Dr. T. Zimmermann, Siemens A G: “Anwendung von CDMA in der Mobilkommunikation” [Use of CDMA for mobile communication]; (8): telecom report 16, (1993), Issue 1, pages 38 to 41; Dr. T. Ketseoglou, Siemens A G and Dr. T. Zimmermann, Siemens A G: “Effizienter Teilnehmerzugriff für die 3. Generation der Mobilkommunikation—Vielfachzugriffsverfahren CDMA macht Luftschnittstelle flexibler” [Efficient subscriber access for 3rd generation mobile communication—multiple-access methods CDMA makes the radio interface more flexible], are referred to as the future third-generation radio telecommunications scenario, based on the prospect of a Universal Mobile Telecommunications System (UMTS).
The second generation radio telecommunications scenario is currently governed, in the microcell and macrocell area, by the GSM-specific radio telecommunications system based on the FDMA/TDMA/FDD transmission principle (Frequency Division Duplex) [Global System for Mobile Communication; vgl. (1): Informatik Spectrum [Information technology spectrum] 14, (1991) June, No. 3, Berlin, DE; A. Mann: “Der GSM-Standard—Grundlage für digitale europäische Mobilfunknetze” [The GSM Standard—the basis for digital European mobile radio networks], pages 137 to 152; (2): R. Steele: Mobile Radio Communications, Pentech Press, 1992 (Reprint 1994), Chapter 8: The Pan-European Digital Cellular Mobile Radio System—known as GSM, pages 677 ff.; (3): telekom praxis April 1993, P. Smolka: “GSM-Funkschnittstelle—Elemente und Funktionen” [GSM radio interface—elements and functions], pages 17 and 24] and, in the picocell area, by the DECT telecommunications system based on the FDMA/TDMA/TDD transmission principle (Time Division Duplex) [Digital Enhanced (previously: European) Cordless Telecommunication; see (1): Nachrichtentechnik Elektronik [Electronics information technology] 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 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 Nutzungsgebiete” [Digital convenience for cordless communications—the DECT Standard opens up new fields of use], pages 26 and 27; (3): tec 2/93—The technical magazine from Ascom “Wege zur universellen mobilen Telekommunikation” [Approaches to universal mobile telecommunications], pages 35 to 42; (4): Philips Telecommunication Review Vol. 49, No. 3, September 1991, R. J. Mulder: “DECT, a universal cordless access system”; (5): WO 93/21719 (
FIGS. 1
to
3
with associated description)].
FIG. 1
shows the TCH multiframe, TDMA frame and TDMA timeslot structure for the GSM mobile radio concept which is known for user data transmission on the traffic channel (Traffic Channel TCH) from the documents “(1): Informatik Spectrum [Information technology spectrum] 14 (1991) June, No. 3, Berlin, DE; A. Mann: “Der GSM-Standard—Grundlage für digitale europäische Mobilfunknetze” [The GSM Standard—The basis for digital European modile radio networks], pages 137 to 152; (2): R. Steele: Mobile Radio Communications, Pentech Press, 1992 (Reprint 1994), Chapter 8: The Pan-European Digital Cellular Mobile Radio System—known as GSM, pages 677 ff.; (3): telekom praxis April 1993, P. Smolka: “GSM-Funkschnittstelle—Elemente und Funktionen” [GSM radio interface—elements and functions], pages 17 and 24”, in which the data embedded in the described structure are transmitted using the FDD principle in the uplink path or uplink direction (uplink; “mobile station→base station” transmission) in the frequency band between 890 MHz and 915 MHz and in the downlink path or downlink direction (downlink; “base station→mobile station” transmission) in the frequency band between 935 MHz and 960 MHz.
FIG. 2
shows the multiframe, TDMA frame and TDMA timeslot structure of the DECT mobile ra
Klein Anja
Nasshan Markus
Bell Boyd & Lloyd LLC
Boakye Alexander O.
Pham Chi
Siemens Aktiengesellschaft
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