TDMA network and protocol for reader-transponder communications

Details TDMA network and protocol for reader-transponder communications TDMA network and protocol for reader-transponder communications

1994-02-10

1995-06-13

Hsu, Alpus

Multiplex communications

Wide area network

Packet switching

370 953, 34082554, 455 551, H04J 316, H04B 7212

Patent

active

054250323

ABSTRACT:
A TDMA network for reader-transponder communications including a receiver having an antenna for receiving and transforming radiated energy to a first RF signal and a detector for demodulating and converting the first RF signal to a digital signal. A protocol logic device is provided for decoding the digital signal and for executing a protocol. The protocol comprises a plurality of randomly selected time slots to gain admission to the TDMA network and a plurality of assigned time slots to transmit messages during the reader-transponder communications. In a transponder implementation, an oscillator is provided for converting protocol formatted digital signals from the logic device to a second RF signal. Thereafter, the antenna transforms the second RF signal to radiated energy and transmits the radiated energy. In a preferred embodiment, the TDMA network includes a transmit/receive switch for directing the first and second RF signals along the receive and transmit paths, respectively. A digital memory which communicates with the protocol logic device is provided for storing data unique to a transponder. The protocol also includes a reader control message time slot for interrogating the transponder and an acknowledgment time slot for indicating the reception of a message.

REFERENCES:
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patent: 4642806 (1987-02-01), Hewitt et al.
patent: 4736371 (1988-04-01), Tejima et al.
patent: 4742512 (1988-05-01), Ahashi et al.
patent: 4940974 (1990-07-01), Sojka
patent: 5134615 (1992-07-01), Freeburg et al.
patent: 5172375 (1992-12-01), Kou

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