Mobile Data Networks
Lecture 3 : Media Access
Motivation
Random Access
Controlled Access
Channelization
Comparison
Dr. Rajan Shankaran
Mobile Data Networks
Introduction: Medium Access Control
The air (Ether) is a shared media (like Ethernet cable).
The
Mobile Communications
Lecture 2: Wireless Transmission
Dr Rajan Shankaran
ITEC851
Lecture Outline
This unit focuses on higher layer aspects of mobile
communications: the computer science element rather
than on the radio and transmission aspects, the elect
Mobile Data Networks
Semester II 2016
Macquarie University
Computing
Dr. Rajan Shankaran
Dr Rajan Shankaran
ITEC851 Mobile Data Networks
Lecture Layout
In this lecture, we first introduce the notion of mobile and
wireless communication and discuss novel a
ITEC 851
Mobile Data Networks
Rajan Shankaran
1
Dr.Rajan Shankaran, E6A337, 9850-9537,
(unit convenor)
email [email protected]
Dr. Rex Di Bona, E6B 155, 9850-4242,
email [email protected]
Rajan Shankaran
2
Goals/Objectives
Understanding of adva
ITEC851
Mobile Data Networks
Tutorial 1
1. What are the main problems of signal propagation? Why do radio
waves not always follow a straight line? Why is reflection both
useful and harmful?
2. Why, typically, is digital modulation not enough for radio
tra
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SESSION 2 FORMAL EXAMINATIONS - NOVEMBER
SEAT NUMBER:
MACQUARIE
University
ROOM:
FAMILY NAME:
This question paper must be returned.
Candidates are not permitted to remove any part
of it from the examination room.
OTHER NAMES:.
STUDENT NUMBER:
FORMAL EXAMINATION PERIOD: SESSION 2, NOVEMBER 2015
E
Macquarie University
ITEC851 Mobile Data Networks
In class Quiz 1-1
Time Allowed:
30 (Thirty) minutes (Plus 5 Minutes of Reading Time)
Number of Questions:
6
Total Marks:
30
Instructions:
1. There are six (6) questions. The questions are not of equal valu
ITEC851
Mobile Data Networks
Tutorial 1
1. What are the main problems of signal propagation? Why do radio
waves not always follow a straight line? Why is reflection both
useful and harmful?
ANS
Problems: attenuation, scattering, diffraction, reflection, r
ITEC851
Tutorial Three
Week 4
1. What is the main physical reason for the failure of many
MAC schemes known from wired networks? What is done in
wired networks to avoid this effect?
ANS
Stations in a wired network hear each other. I.e., the length of
wire
ITEC851
Tutorial Three
Week 4
1. An AP in a wireless network plays the same role as a link-layer
switch in a wired network. However, a link-layer switch has no
MAC address, but an AP normally needs a MAC address. Explain
the reason.
2. An 802.11 network n
ITEC851
Tutorial Two
Week 4
1. What is the main physical reason for the failure of many
MAC schemes known from wired networks? What is done in
wired networks to avoid this effect?
ANS
2. Recall the problem of hidden and exposed terminals. What
happens in
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