Method of controlling message transmission sequence in multi sta

Details Method of controlling message transmission sequence in multi sta Method of controlling message transmission sequence in multi sta

1982-04-22

1984-04-24

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 85, 3408255, H04J 600

Patent

active

044452144

ABSTRACT:
A communication scheme for a multi station message transmission system involves the transmission of messages from one station to another, a return message from the receiving station and the retransmission of a previously transmitted message if an acknowledgement is not received. Each message, which may or may not contain data, includes a header having a sequence bit and an acknowledge bit. Each station within the communication system stores in memory a transmit sequence bit and a receive sequence bit. The header of each message that is transmitted from a given station contains a sequence bit corresponding to the state of the transmit sequence bit stored at that station. When a message having an acknowledge bit is received, the state of the stored transmit sequence bit is switched. Upon receipt of a data message having a sequence bit that corresponds to that of the stored received sequence bit at that station, the state of the stored received sequence bit is switched and an acknowledge bit-containing message is returned. If the acknowledge bit is not received from receiving station in a predetermined time after the initial transmission, the previously transmitted message is retransmitted. When the state of the sequence bit in the message is different from that of the received sequence bit stored at the station, and incoming message is disregarded.

REFERENCES:
patent: 4074232 (1978-02-01), Otomo et al.
patent: 4096355 (1978-06-01), Rothauser et al.
patent: 4342995 (1982-08-01), Shima

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