Multiplex communications – Wide area network – Packet switching
Patent
1994-07-13
1995-05-16
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
379 58, 455 561, 371 471, H04B 150
Patent
active
054167795
ABSTRACT:
A communication procedure suitable for a cordless telephone system involves time division duplex radio communication between a handset 11 and a base station 3 using alternating bursts of transmission over a single radio channel. Once a radio link has been set up, initial transmissions carry a synchronisation logical channel S and a signalling logical channel D multiplexed together, but the link may switch to bursts carrying a communications logical channel B for the speech data and the signalling logical channel D. Burst synchronisation is achieved by the asynchronous detection of words in a synchronisation channel S. These words have bit patterns reducing the probability of incorrect asynchronous detection of them. If one part ceases to receive handset signals from the other, it transmits a special signal, informing the other part. This enables both parts to detect the failure of a link at substantially the same time, so that their actions to re-establish the link are synchronised.
REFERENCES:
patent: 4404672 (1983-09-01), Shimizu
patent: 4653053 (1987-03-01), Pelchat et al.
patent: 4688207 (1987-08-01), Yoshimoto
patent: 4853951 (1989-08-01), Bauer
patent: 4903257 (1990-02-01), Takeda et al.
patent: 4970506 (1990-11-01), Sakaida et al.
patent: 5001703 (1991-03-01), Johnson et al.
patent: 5020051 (1991-05-01), Beesley et al.
patent: 5022050 (1991-06-01), Tanaka
patent: 5029334 (1991-07-01), Braun et al.
patent: 5046063 (1991-09-01), Lagess
MPT 1317, Apr. 1981, Code of Practice, "Transmission of digital information over Land Mobile Radio Systems".
Goatly et al, "Duplex Digital Transmission in the Subscribers Local Network", Plessey Telecommunications Research Ltd., Taplow, UK, pp. 186-189.
Dr. H. Ochsner, "Cordless Telecommunications: Towards a Digital Standard", 88CH60.0 C 1988, IEEE.
H. Shimizu et al, "An Integrated Voice/Data Terminal with Simple Synchronization Circuits Using an 80 kbit/s Ping-Pong Method", 8089 IEEE Transactions on Communications vol. COM-30 (1982) Sep., No. 9, New York, pp. 2109-2116.
D. J. Clothier, et al, "A digital transmission system for multi-terminal applications", 1268 GEC Telecommunications Journal, (1980) No. 41, Rugby, Great Britain, pp. 10-15.
H. P. Bauer, "Schnurloses Telefon fur den 900-MHz-Bereich", Neue Dienste, Bd. (1985) Heft 7, pp. 468-471.
Barnes Nigel E.
Bidwell Brian A.
Bud Andrew
Crisp Malcolm
Dudek Michael T.
AT&T Wireless Communications Products Limited
British Telecommunications public limited company
GPT Limited
Kenwood Corporation
Northern Telecom Limited
LandOfFree
Time division duplex telecommunication system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Time division duplex telecommunication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Time division duplex telecommunication system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-643802