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TCP aware local retransmissioner scheme for unreliable transmission network

  • US 6,961,327 B2
  • Filed: 08/16/2001
  • Issued: 11/01/2005
  • Est. Priority Date: 08/18/2000
  • Status: Active Grant
First Claim
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1. A TCP local retransmission scheme, used in an unreliable network, is comprised of:

  • A. when an access point of an unreliable link receives a new TCP data packet from an Internet TCP source, said access point inserting into said data packet, an LAC-PDU head with a timestamp of a first local sequence number;

    said data packet encapsulated as an LAC-PDU packet comprising “

    LAC-PDU head+IP head+TCP head+Data”

    ;

    B. delivering said data packet to a current terminal;

    said current terminal producing an acknowledgement packet (ACK1) comprising an acknowledgement number (AN) when said current terminal successfully receives a TCP data packet;

    said current terminal also inserting to said LAC-PDU head, a time-stamp of a second local sequence number such that said acknowledgement packet is encapsulated as an LAC-PDU acknowledgement packet and is delivered back to said access point of an unreliable link;

    C. at said access point of an unreliable link, detecting whether there is data packet loss based on said time-stamp of a first local sequence number, stored in said access point, said acknowledgment number (AN) and said time-stamp of a second local sequence number, wherein both are determined from said acknowledgement packet; and

    D. if a lost data packet is detected, updating and retransmitting said time-stamp of a first local sequence number in LAC-PDU head, and when congestion loss of the data packet which corresponds to said acknowledgement number (AN) of acknowledgement packet (ACK1) is impossible, said acknowledgement packet (ACK1) along with a marked explicit retransmission feedback (ERN) field is delivered to said Internet TCP source.

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