초록 ▼

A method and system for communicating digital data particularly adapted for transferring large amounts of bulk data from a first station to a second station over a long propagation delay path, as for example, between first and second earth stations via a satellite repeater. The system implements a p

A method and system for communicating digital data particularly adapted for transferring large amounts of bulk data from a first station to a second station over a long propagation delay path, as for example, between first and second earth stations via a satellite repeater. The system implements a procedure or protocol which is characterized by causing the source station to continuously transmit data frames at fixed intervals, each such data frame including an identification number and an information field, generally containing a portion of a user data record. Error checking means at the destination station determines whether the data frames received thereat are error free. The destination station also continuously transmits data frames at fixed intervals substantially synchronized with the source station data frame intervals. Each data frame transmitted by the destination station may include a source station identification number and a positive or negative acknowledgement to indicate whether or not the identified source station data frame was correctly received by the destination station. The source station then interprets the destination station data frame to determine whether it is necessary to retransmit any previously transmitted data frames.

대표청구항 ▼

A system for transferring user data from a first station source to a second station destination via a communication path, said system comprising: a transmitter connected to said first station source for transmitting data frames, each data frame comprising a bit stream defining an identification numb

A system for transferring user data from a first station source to a second station destination via a communication path, said system comprising: a transmitter connected to said first station source for transmitting data frames, each data frame comprising a bit stream defining an identification number, said identification number identifying the data frame and said bit stream including an information field for accommodating a block of user data originally supplied by said first station source device, said first station transmitter including a transmit list means for storing a list of identification numbers, related to specific ones of said previously transmitted data frames, said first station including buffer means for storing the said data blocks contained in the data frames previously transmitted and identified by said identification numbers stored in said transmit list means, a receiver means located at said second station and coupled into said path for receiving data from said first station transmitter, said receiver means at said second station including means for receiving said data frames transmitted by said first station transmitter and for analyzing said received data frames to determine whether the received data frames need to be retransmitted, said second station including transmitter means for transmitting data frames each comprising a bit stream, said second station transmitter bit stream containing acknowledgement data, said acknowledgement data including an identification number identifying the particular one of said data frames received from said first station transmitter and said second station transmitter means inserting in its said acknowledgement data, an acknowledgement code indicating whether or not the respective data frame should be repeated or not, and said first station including a receiver means coupled to said path, said first station receiver means receiving said second station transmitted frames each comprising said bit stream, said first station including processor means connected to said first station receiver means and responsive to the acknowledgement data in said bit stream from said second station transmitting means and to said identification numbers in said transmit list for selectively retransmitting said data blocks identified thereby.