H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/75
H04L 1/00 (2006.01) H04L 1/16 (2006.01) H04L 1/18 (2006.01) H04L 29/06 (2006.01)
Patent
CA 1155521
METHOD AND SYSTEM FOR RETRANSMITTING INCORRECTLY RECEIVED NUMBERED FRAMES IN A DATA TRANSMISSION SYSTEM Abstract of the Disclosure A method and a system for the retransmission of in- correctly received frames in a transmission system in which information is transmitted in the form of sequen- tially numbered frames. Each information frame includes a so-called send sequence number, N(S), a bit, R, in- dicating if this information frame has previously been retransmitted, and an information field containing the information to be transmitted. At the transmitting station, a variable V(T), whose value is representative of the order in which a frame is re-transmitted relative to the sequence of frames transmitted for the first time, is associated with each retransmitted frame. At the receiving station, the incoming information frames are checked for errors and the N(S) of frames found to be incorrect is noted. The receiving station then sends to the transmitting station a so-called Checkpoint (CP) message containing a so-called receive sequence number, N(R), representative of the send sequence number, N(S), of the most recently received, non-retransmitted, error- free information frame, and, if at least one incorrect frame has been received, at least one identifier, N(X), representative of the N(S) of the incorrect frame whose retransmission is requested. Upon receipt of the Check- point message, the transmitting station retransmits re- quested information frames that have not been previously retransmitted; it also retransmits previously retrans- mitted frames, only if the V(T) values associated there- with are less than the receive sequence number, N(R), contained in the CP message; and it updates the V(T) value associated with each frame thus retransmitted. In a preferred embodiment of the invention, the Check- point messages are transmitted on a periodic basis. Each of these contains an X bit whose value indicates whether the values between N(R) and the highest N(X) are also to be considered as N(X) values.
381273
Barrett B.p.
International Business Machines Corporation
LandOfFree
Method and system for retransmitting incorrectly received... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system for retransmitting incorrectly received..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for retransmitting incorrectly received... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-955035