Computer Networks - Performance and QOS by I. Marsic

By I. Marsic

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After waiting for backoff countdown, the sender repeats the cycle and retransmits the packet. As we know from the earlier discussion, the sender does not persist forever in resending the packet, and if it exceeds a given threshold, the sender gives up and aborts the retransmissions of this packet. ALOHA is a very simple protocol, almost identical to Stop-and-Wait ARQ, except for the backoff interval. ALOHA also does not initiate transmission of the next packet before ensuring that the current packet is correctly received.

The time (in packet transmission units) required for all network nodes to detect a start of a new transmission or an idle channel after a transmission ends is an important parameter. Intuitively, the parameter β is the number of bits that a transmitting station can place on the medium before the station furthest away receives the first bit of the first packet. Recall that signal propagation time is tp = distance/velocity, as given earlier by Eq. 3). The transmission delay is tx = packet-length/bandwidth, as given by Eq.

In other words, the goodput is the fraction of time that the receiver is receiving data that it has not received before. The transmissions of packets between a sender and a receiver are usually illustrated on a timeline as in Figure 1-16. There are several types of delay associated with packet transmissions. To illustrate, here is an analogy: you are in your office, plan to go home, and on your way home you will stop at the bank to deposit your paycheck. From the moment you start, you will get down to the garage (“transmission delay”), drive to the bank (“propagation delay”), wait in the line (“queuing delay”), get served at teller’s window (“processing delay” or “service delay”), and drive to home (additional “propagation delay”).

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