Assume a wireless network consists of an access point (denoted as X) and two wireless nodes(denoted as A and B respectively). Assume that wireless nodes A and B cannot hear eachother's transmissions, but they can hear X (i.e. X can hear A and B). SupposeAt time Jμs, X is sending a packet to some other node and it completes sending thispacket at time 100 μs.At time 20 μs, a packet becomes available for transmission at A. A needs 150 µs tosend this packet.At time 60 μs, a packet becomes available for transmission at B. B needs 100 µs tosend its packet.Let the value of the backoff timer for A be 40 µ. and the value of the backoff timerfor B be 60 μs. 2) Analyse the above transmission situation and describe the transmission procedure. In yourdescription, clearly state which node starts to sense and transmit at what time and how longit would take. Start your description from 0 us in the network. Suppose the network onlyuses CSMA/CA without the RTS/CTS scheme.

Answered: 2) Analyse the above transmission…

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

Section: Chapter Questions

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Assume a wireless network consists of an access point (denoted as X) and two wireless nodes
(denoted as A and B respectively). Assume that wireless nodes A and B cannot hear each
other's transmissions, but they can hear X (i.e. X can hear A and B). Suppose
At time Jμs, X is sending a packet to some other node and it completes sending this
packet at time 100 μs.
At time 20 μs, a packet becomes available for transmission at A. A needs 150 µs to
send this packet.
At time 60 μs, a packet becomes available for transmission at B. B needs 100 µs to
send its packet.
Let the value of the backoff timer for A be 40 µ. and the value of the backoff timer
for B be 60 μs.

2) Analyse the above transmission situation and describe the transmission procedure. In your
description, clearly state which node starts to sense and transmit at what time and how long
it would take. Start your description from 0 us in the network. Suppose the network only
uses CSMA/CA without the RTS/CTS scheme.

Expert Solution

Introduction

CSMA/CA stands for Carrier Sense Multiple Access with Collision Avoidance. It is a type of network protocol used in wireless networks. It is used to reduce the probability of data collisions in a network. The basic idea behind CSMA/CA is that when a device wants to transmit data, it first listens to the channel to check if it is busy. If the channel is idle, it will send the data and wait for an acknowledgment from the receiver. If the channel is busy, the device will wait until the channel is idle again and then transmit the data. Collisions are avoided by using a random back-off algorithm to decide when each device should transmit.

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