Search results
Dec 21, 2023 · Selective Repeat is part of the automatic repeat-request (ARQ). With selective repeat, the sender sends a number of frames specified by a window size even without the need to wait for individual ACK from the receiver as in Go-Back-N ARQ. The receiver may selectively reject a single frame, which may be retransmitted alone; this contrasts with ...
When the receiver detects errors in a packet, how does it let the transmitter know to re-send the corresponding packet? Systems which automatically request the retransmission of missing packets or packets with errors are called ARQ systems. Three common schemes. Stop & Wait. Go Back N. Selective Repeat.
Predictive Selective Repeat (PSR) ARQ is the technique introduced in this paper to send multiple copies of frames without waiting for ACK. The main goal of PSR ARQ model is to optimally predict the number of required copies for a particular frame so as to reduce the number of Round-Trips by using a Time series Forecasting Long Short-Term Memory (LSTM) model.
This interactive animation brings to life the Selective Repeat protocol. In this demo, the sending window limits the sender to a maximum of 5 outstanding, unpacked data packets. To create new data packets, click "Send New". This action will begin moving data packets between sender and receiver.
• Nack’sare used in some versions of the go-back-N and selective repeat protocols to reduce delays, And, in RMP - the reliable multicast protocol - we will showhow NACK’scan reduce the number of control messages. —Importance of numbering • Unnumbered messages —round trip delay > the time between retransmissions
Problem-04: Consider a 128 x 10 3 bits/sec satellited communication link with one way propagation delay of 150 msec. Selective Retransmission (repeat) protocol is used on this link to send data with a frame size of 1 KB. Neglect the transmission time of acknowledgement.
Efficiency of SR Protocol-. Efficiency of any flow control protocol is given by-. Efficiency = Sender Window Size in Protocol / (1 + 2a) In selective repeat protocol, if sender window size = N, then-. Efficiency of SR Protocol = N / (1 + 2a) To gain better understanding about Selective Repeat ARQ, Watch this Video Lecture.
