Repeat request signal transmission method for multi-station packet communication
Patent 4888767 Issued on December 19, 1989. Estimated Expiration Date: 
July 7, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 7, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesApparatus and method for collision avoidance Error monitoring in digital transmission systems Method and apparatus of packet switching Apparatus for switch path verification Transmitting sequence numbers of information in a packet data transmission system Patent #: 4617657 InventorsAssigneeApplicationNo. 217090 filed on 07/07/1988US Classes:370/243, Of a repeater system370/314, Using time division multiplexing370/347, Multiple access (e.g., TDMA)370/436, Combined time and frequency assignment375/285, Antinoise or distortion455/526, Plural receivers tuned to common frequency714/748Request for retransmissionExaminersPrimary: Olms, Douglas W.Assistant: Kuntz, Curtis Attorney, Agent or FirmInternational ClassH04J 003/16Foreign Application Priority Data1984-12-25 JPAbstractIn a network wherein all the receive stations connected to a radio link or a bus type wire link are capable of observing information which is being transmitted over the link, a method of allowing each receive station to send back a repeat request signal in multi-station packet communication in which a single transmit station transmits the same message to a plurality of receive stations. The same number of frequencies as packets are used so that a sinusoidal wave having a particular one of the frequencies which is associated with a packet with an error is sent. Alternatively, the same number of time slots as packets are set up so that a burst signal is sent as a repeat request signal in a particular one of the time sots which is associated with information on a packet with an error. Utilizing the fact that the signals to be sent are repeat request signals, the method insures accurate delivery of retransmit request information to the transmit station even if repeat request signals sent back at the same time are in a conflict.Other References
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