Electrical computers and digital processing systems: multicomput – Computer-to-computer data modifying
Reexamination Certificate
2001-02-12
2004-11-23
Vu, Thong (Department: 2142)
Electrical computers and digital processing systems: multicomput
Computer-to-computer data modifying
C709S233000, C709S235000
Reexamination Certificate
active
06823396
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally pertains to wireless data transmission systems. In particular, the present invention pertains to data transmission in wireless data transmission systems.
2. Discussion of the Related Art
Data telecommunication comprises the reciprocal sending and receiving of data or data signals (packet data) between a data terminal, for example a personal computer, data terminal, data processing system etc., and a remote data terminal, for example a personal computer, data terminal, data processing system etc., over a telecommunication network, for example a public telecommunication network (such as ISDN, PSTN, etc.). To enable the data or data signals sent by the data terminal to be transmitted over the tele-communication network, a technical network device, the so-called data transmission device, is arranged between the data terminal and the tele-communication network. Besides the PC card, formerly known as PCMCIA card, the most commonly used data transmission device is the modem, which is a contraction of modulator/demodulator.
The modem is an electrical data transmission device that operates on the basis of carrier current for use on analog transmission paths having a limited bandwidth, e.g. telecommunication lines, such as a/b line pair, ISDN S0 bus etc., of the telecommunication network, which converts digital data signals into analog data signals and vice versa and transmits them. A large number of V-series Methods standardized by the International Telecommu-nication Union—Telecommunication Standards (ITU-T) are also implemented in modems.
According to the ITU-T V.24 specification of March 1993, pages 1 to 19, a V.24 cable or a V.24 interface KV.24 supports modem operation on a personal computer over various lines known as status lines. These lines are namely: 1. a transmit data line TxD for data transmission; 2. a receive data line RxD for data transmission; 3. an RTS line (Ready To Send) RTS for the “hardware handshake” transmission mode for transmitting the status “READY TO SEND” (status “RTS”); 4. a CTS line (Clear To Send) CTS for the “hardware handshake” transmission mode for transmitting the status “CLEAR TO SEND” (status “CTS”); 5. an RI line (Ring Indication) RI for call detection at the modem; 6. a DSR line (DATA SET READY) DSR on which the modem signals the personal computer that it is switched on; 7. a DTR line (DATA TERMINAL READY) DTR on which the personal computer signals the modem that it is switched on and ready to establish connections; 8. a DCD line (DATA CHANNEL DETECTION) DCD on which the modem signals the personal computer that it has established the connection to a remote modem; and 9. a ground line (GrouND) GND.
If the V.24 cable or the V.24 interface KV.24 does not have the nine lines enumerated above, but has fewer than nine, for example seven, then this 7-conductor cable can nevertheless support modem operation on the personal computer. This is performed by using, instead of “hardware handshaking” on the RTS/CTS lines, a “software handshake” transmission mode for transmitting the statuses “RTS”, “CTS”—for example using an XON/XOFF protocol—on the transmit/receive data lines TxD, RxD. With “software handshaking” the data stream transmitted between the data terminal DEE and the data transmission device D{haeck over (s)}E is analyzed in the data terminal DEE and the data transmission device D{haeck over (s)}E, all “software handshake characters” are interpreted, and actions are initiated accordingly.
Air interfaces are wireless telecommunication interfaces in which messages are wirelessly transmitted over a long-distance transmission path between a message source and a message sink on the basis of various communication methods FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access) and/or CDMA (Code Division Multiple Access), are set forth according to radio standards such as DECT [Digital Enhanced (formerly: European) Cordless Telecommunication; cf. Nachrichten technik Elektronik 42 (1992) Jan./Feb. 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 and the DECT publication of the DECT-Forum, February 1997, pages 1 to 16], GSM [Groupe Sp,ciale Mobile or Global System for Mobile Communication; cf. Informatik Spektrum 14 (1991) June, No. 3, Berlin, DE; A. Mann: “Der GSMS-Standard—Grundlage for digitale Europische Mobilfunknetze” (The GSM Standard—Basis for Digital European Mobile Radio Networks), pages 137 to 152 in conjunction with the publication telekom praxis 4/1993, P. Smolka “GSM-Funkschnittstelle—Elemente und Funk tionen” (GSM radio interface—elements and functions), pages 17 to 24], UMTS [cf. Funkschau 6/98: R. Sietmann “Ringen urn die UMTS-Schnittstelle” (Battle for the UMTS interface), pages 76 to 81], WACS or PACS, IS-54, IS-95, PHS, PDC etc. See also, IEEE Communications Magazine, January 1995, pages 50 to 57; D. D. Falconer et al: “Time Division Multiple Access Methods for Wireless Personal Communications”.
According to the publication “Vortrag von A. Elberse, M. Barry, G. Fleming zum Thema: “DECT Data Services—DECT in Fixed and Mobile Networks”, 17/18 June 1996, Sofitel Hotel, Paris; pages 1 to 12 and abstract” DECT Technology, based on the journal “Nachrichtentechnik Elektronik 42 (1992) Jan./Feb. No. 1, Berlin, DE. See also, 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 and the Journals Components 31 (1993), Issue 6, pages 215 to 218; S. Althammer. D. Brockmann: “Hochoptimierte IC's for DECT-Schnurlostele-fone” (Super-optimized Ics for DECT cordless telephones), and WO 96/38991. The principal application of DECT (Digital Enhanced Cordless Telecommunication) technology will be in the area of wireless mobile telecommunication of voice and/or packet data, in which, as a result of the DECT network access technology, the user can be both his own network operator and can access a higher telecommunication network for long-distance transmission of user data.
SUMMARY OF THE INVENTION
It is an object of the present invention to provie a method for controlling control the transmission of control commands or control information for the data transmission device from the data terminal to the data transmission device in a wireless V.24 data transmission system operating between a data terminal and a data transmission device for data telecommunication.
It is another object of the invention to provide such a way that the recognizability of control commands or control information for the data transmission device is ensured.
These and other objects of the invention will become apparent upon careful review of the detailed description of the preferred embodiments which is to be read in conjunction with a review of the drawing figures.
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Alfaro Diego Garcia
Biedermann Rolf
Bell Boyd & Lloyd LLC
Siemens Aktiengesellschaft
Vu Thong
LandOfFree
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