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Method and system for a voiding unnecessary retransmissions using a selective rejection data link protocol

  • US 5,664,091 A
  • Filed: 08/31/1995
  • Issued: 09/02/1997
  • Est. Priority Date: 08/31/1995
  • Status: Expired due to Term
First Claim
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1. A system for selectively retransmitting data packets detected as incorrect during a transmission of a data file from a transmitter to a receiver, said data file comprising a plurality of sequentially numbered data packets, the retransmission system comprising:

  • the transmitter comprising a processor connected to a memory, wherein said transmitter transmits and receives message signals, said transmitted message signals including data packets and requests for status (RQST), said received message signals including responses to the RQSTs,wherein said transmitter originally transmits said data packets sequentially, and wherein said transmitter issues the RQSTS at a predetermined rate;

    the receiver comprising a processor connected to a memory, wherein said receiver transmits and receives message signals, said received message signals including the data packets and the RQSTs, said transmitted message signals including the responses to the RQSTs, said responses including requests for retransmission of data packets detected as incorrect, said receiver processor being operable to detect incorrect data packets and determine the sequence number of said detected incorrect data packets,wherein said transmitter processor and said receiver processor store in the transmitter memory and receiver memory, respectively, data indicating progress of cycles of round trips of message signal retransmission between the transmitter and the receiver, andwherein each said RQST and response message signals includes a data field, each said data field including data representative of the progress of the cycles such that unnecessary retransmission of a data packet requested for retransmission in a response message signal is avoided while said requested data packet is in transit to said receiver.

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