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Title:
METHOD FOR OPERATING A SYSTEM COMPRISING A PLURALITY OF NODES AND A BASE STATION ACCORDING TO TDMA, AND ASSOCIATED SYSTEM
Document Type and Number:
WIPO Patent Application WO2004023419
Kind Code:
A3
Abstract:
Disclosed is a method for operating a system according to time division multiple access (TDMA), comprising a plurality of wireless sensors and/or actuators as nodes (S.1 ... S.n) and a base station (BS), said system being installed in a machine or an installation, such as an industrial robot, automatic production or fabrication machine. Cyclical TDMA data transmission blocks are transmitted, each TDMA data transmission block being composed of successive time slots, each of which is assigned to a specific node. The uplink signals (UL.1 ... UL.n) from the different nodes (S.1 ... S.n) to the base station (BS) can be simultaneously transmitted on two, three or more different frequencies (f1, f2, f3) while the downlink signals (DL) from the base station (BSA) to the different nodes (S.1 ... S.n) are transmitted on a single frequency that is different from the uplink frequencies. The time slots and the different uplink frequencies are defined once and are subsequently maintained.

Inventors:
APNESETH CHRISTOFFER (NO)
VEFLING HARALD (NO)
ENDRESEN JAN (NO)
DZUNG DACFEY (CH)
Application Number:
EP0308691W
Publication Date:
May 27, 2004
Filing Date:
August 06, 2003
Export Citation:
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Assignee:
ABB RESEARCH LTD.
APNESETH, CHRISTOFFER
VEFLING, HARALD
ENDRESEN, JAN
DZUNG, DACFEY
International Classes:
G05B19/414; H04J4/00; (IPC1-7): G08C17/02
Foreign References:
EP1022674A22000-07-26
US5748103A1998-05-05
US4614945A1986-09-30
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