System for the retransmission of incorrectly received numbered frames in a data transmission system

摘要

method and system for retransmission of frames numbered in sequence received in error.each frame contains a bit indicating whether the frame r is previously transmitted, and a sequence number (n) (s)).each of the frames is associated with a shared variable (v (t)) representative of the order of transmission of the frame.the receiving station transmits to the transmitting station a message containing a number, pc ((r)) representative of the n (s) of the last frame is not received correctly, and a retransmissionn (x) of identifiers received in error frame whose retransmission is requested.the broadcasting station transmits the requested frame which have not already been transmitted and those that have already been broadcast, and the variable v (t) is less than n (r).application to transmission systems using an hdlc procedure.