Selective packet retransmission with timing control at the transmitter end

  • US 6,922,805 B2
  • Filed: 06/03/2002
  • Issued: 07/26/2005
  • Est. Priority Date: 06/06/2001
  • Status: Expired due to Fees
First Claim
Patent Images

1. A transmission system comprising:

  • at least one transmitter (10);

    at least one receiver (30);

    said transmitter including;

    means of transmitting packets (TX1) that contain an indication of packet processing time (TT, TL), where TT is the processing time of a packet QT being processed at the moment that a retransmission request (RR) is transmitted, and TL is the processing time of a packet QL to be retransmitted, and means of receiving (RX1) retransmission requests (RR) relating to a packet to be retransmitted (QL);

    said receiver including;

    means of for receiving (RX3) packets, means of processing the packets received (DEC), and means of transmitting (TX3) retransmission requests relating to a packet to be retransmitted;

    wherein at least certain of said retransmission requests contain a recovery data (SNT;

    TT) allowing the recovery of the processing time indication (TT), where SNT is a sequence number for a packet QT; and

    said transmitter further including;

    means (E1) of recovering a processing time indication (TT) from a recovery data (SNT, TT) contained in a received retransmission request, and means (E1) of comparing the recovered processing time indication and the processing time indication of the packet to be retransmitted, so as to authorize or block the retransmission of the packet to be retransmitted, whereby retransmission is permitted if TL

    TT

    ½

    θ



    being an estimate of the round-trip transmission time on an associated transmission network), and if TL

    TT<

    ½

    θ

    , retransmission is blocked.

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