selective repeat protocol
If acknowledgment is not received then entire frames are retransmitted again.Selective Repeat is also a protocol for flow control mechanism.
The selective repeat protocol is similar to Go back N except in the following way- Frame Formats are similar in both the protocols; The sender has a window defining maximum number of outstanding frames in both the protocols; Both uses piggybacked acknowledgements where possible and does not acknowledge every frame explicitly. SR protocol may be considered as a combination of advantages of Stop and Wait ARQ and Go back N. SR protocol is superior to other protocols but because of its complexity, it is less used. Operation of Selective Repeat. In this protocol, only the erroneous or lost frames are retransmitted, while the …
During the data transmission between the sender and the receiver; if the acknowledgement is lost or the frame has been damaged then the sender has to resend all the frames starting from the damaged or corrupted frame.Enter your email address to subscribe to this blog and receive notifications of new posts by email. Selective Repeat protocol. If the last transmitted frame is lost then the receiver does not respond and this silence is a negative acknowledgement for the sender.If the sender does not receive any ACK or the ACK is lost or damaged in between the transmission.
The transmitter then continues normal transmission of new PDUs until the PDUs are acknowledged or another selective repeat request is received. But I do not understand why the datalink layer use GO Back N protocol mostly as compare to others… I was struggling till i saw this. The “selective repeat protocol” retransmits only that frame which is damaged or lost.Go-Back-N protocol is a sliding window protocol.
SR protocol may be considered as a combination of advantages of Stop and Wait ARQ and Go back N. SR protocol is superior to other protocols but because of its complexity, it is less used. –Selective Repeat. Go back N and Selective Repeat are similar in terms of efficiency if sender window sizes are same. Go back N and Selective Repeat are similar in terms of efficiency if sender window sizes are same. In selective repeat protocol, the retransmitted framed is received out of sequence. The selective repeat protocol retransmits only that frame which is damaged or lost. Selective Repeat Protocol.
Once acknowledged, sender sends another frame to the receiver.
While sorting, if a frame number is skipped, the receiver recognizes that a frame is lost and it sends NAK for that frame to the sender.After receiving NAK for the lost frame the sender searches that frame in its window and retransmits that frame.
The sender waits for the time to run out and as the time run-outs, the sender retransmits all the frames for which it has not received the ACK.
In this case, the receiver maintains a buffer to contain out-of-order packets and sorts them.The sender selectively re-transmits the lost packet and moves the window forward. An alternative strategy, the selective repeat protocol, is to allow the receiver to accept and buffer the frames following a damaged or lost one. The Selective Repeat Protocol also uses two windows: a send window and a receive window. Send Window: First, the size of the send window is much smaller; it is 2^m-1. The sender window size is equal to ‘w’.
This protocol is almost like Go-Back-N ARQ protocol, or we can say that it is a modified form of GBN ARQ, the part where it differs is that here buffers are used and both receiver & sender maintain a window of size. The sender identifies the loss of ACK with the help of a timer.The selective repeat is a more efficient protocol as it does not waste bandwidth for the frames which are properly received but, its complexity and expense favours the use of the go-back-n protocol.Awesome explanation on this topic. The selective repeat protocol retransmits only that frame which is damaged or lost. Selective Repeat Protocol also referred to as Selective Repeat ARQ (Automatic Repeat reQuest), is a data link layer protocol that uses sliding window method for reliable delivery of data frames.
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