In the generic SR protocol, the sender transmits a message as soon as it is available (if it is in the window) without waiting for an acknowledgment. Suppose now that we want an SR protocol that sends messages two at a time. That is, the sender will send a pair of messages and will send the next pair of messages only when it knows that both messages in the first pair have been received correctly.Supposethat the channel may lose messages but will not corrupt or reorder messages. i) Outline an error-control protocol for the unidirectional rdt of messages. ii) Give an FSM description of the sender and receiver. iii) Describe the format of the packets sent between sender and receiver and vice versa. iv) If you use any procedure calls other than those in SR protocol (for example, udt_send(), start_timer(), rdt_rcv(), and so on),clearly state their actions. v) Give an example (a timeline trace of sender and receiver) showing how your protocol recovers from a lost packet

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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 In the generic SR protocol, the sender transmits a message as soon as it is available (if it is in the window) without waiting for an acknowledgment. Suppose now that we want an SR protocol that sends messages two at a time. That is, the sender will send a pair of messages and will send the next pair of messages only when it knows that both messages in the first pair have been received correctly.Supposethat the channel may lose messages but will not corrupt or reorder messages.

i) Outline an error-control protocol for the unidirectional rdt of messages.

ii) Give an FSM description of the sender and receiver.

iii) Describe the format of the packets sent between sender and receiver and vice versa.

iv) If you use any procedure calls other than those in SR protocol (for example, udt_send(), start_timer(), rdt_rcv(), and so on),clearly state their actions.

v) Give an example (a timeline trace of sender and receiver) showing how your protocol recovers from a lost packet

 

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