Adaptive time-division multiplexing communications protocol meth

Details Adaptive time-division multiplexing communications protocol meth Adaptive time-division multiplexing communications protocol meth

1994-11-17

1997-11-11

Olms, Douglas W.

Multiplex communications

Channel assignment techniques

Polling

370503, H04L 12403

Patent

active

056871759

ABSTRACT:
A system and method for an adaptive time-division multiplexing communications protocol for collecting data from remote sensors equipped with RF transceivers using an RF transceiver equipped mobile data collection unit. RF transceivers interfaced to remote sensors actively monitor a predetermined RF transmission frequency to ascertain the presence of a signal transmitted by the mobile unit. All remote units detecting the RF signal listen for a message from the mobile unit requesting transmission of their unique identifier, i.e., their ID. This message contains the Time Division Base (TDB) specifying the number of time slots allocated for transmission of remote sensor IDs to the mobile unit. Using the TDB, each remote sensor randomly selects a time slot and transmits its ID to the mobile unit. Unique IDs of remote sensors received by the mobile unit are used to individually poll each sensor for data packet transmission. Upon receipt of a data packet from a remote sensor, the mobile unit sends an acknowledgment packet indicating its data has been received. Upon receipt of the acknowledgment packet, the sensor is set to a state whereby it will not respond to a request for identifier for a specified period of time.

REFERENCES:
patent: 4742512 (1988-05-01), Akashi et al.
patent: 5172375 (1992-12-01), Kou
patent: 5297144 (1994-03-01), Gilbert et al.
Int'l App. No: PCT/US93/04024 PCT Notification of Transmittal of International Preliminary Examination Report, dated Dec. 7, 1994.

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