session 1 introduction prof anirudha sahoo iit bombay
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Session 1 Introduction Prof. Anirudha Sahoo IIT Bombay. IT 601: Mobile Computing . Course Evaluation . Home assignment – 10% Pop Quizzes – 5% MidSem – 25% Project – 25% EndSem – 35%. Course Evaluation . Academic dishonesty (in any form) will not be tolerated

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session 1 introduction prof anirudha sahoo iit bombay
Session 1

Introduction

Prof. Anirudha Sahoo

IIT Bombay

IT 601: Mobile Computing
course evaluation
Course Evaluation
  • Home assignment – 10%
  • Pop Quizzes – 5%
  • MidSem – 25%
  • Project – 25%
  • EndSem – 35%
course evaluation1
Course Evaluation
  • Academic dishonesty (in any form) will not be tolerated
    • will result in FF grade
  • Attendance : as per Institute rules
  • Audit Requirements
    • attendance : as per Institute rules
    • must appear midsem and endsem exams
    • may exchange endsem with project
    • take quiz/homework
    • at least CC grade in the evaluation
prerequisite
Prerequisite
  • Basic Computer Networks
    • Sound knowledge in traditional MAC protocols
    • IP routing protocols
    • TCP
  • Basics of Probability theory and queuing theory
references
References
  • Mobile Communications – J. Schiller, Pearson education publishing 2003
  • Wireless Communications and Networks – W. Stallings, Pearson education publishing 2002
  • Technical papers – will be given out throughout the course
introduction
Introduction
  • What is different in wireless network?
    • Bandwidth
    • Error rate
    • Media
    • Signal strength (fading)
    • MAC
    • Mobility
    • Security
wireless networks
Wireless networks
  • Two types
    • Voice network
      • Cellular systems (GSM, CDMA etc.)
    • Data network
      • WiFi, HiperLAN
  • Networks are moving towards an integrated network
    • GPRS
    • Voice over WiFi
physical layer phy
Physical Layer (PHY)
  • Binary (digital) data transmitted over airwave
  • Requires antenna
  • characterized by transmission range, power, modulation scheme, frequency range
mac layer
MAC Layer
  • How wireless stations share the air medium and avoid contention to transmit data successfully
  • “listen before you speak” or “speak at predetermined interval”
  • Unique problems
    • Hidden node
    • Exposed node
network layer
Network Layer
  • Responsible for facilitating multihop communication
  • Need to run some routing protocol
  • Traditional routing protocols may not work efficiently
  • Mobility at IP layer
transport layer
Transport Layer
  • Reliable Transport such as TCP may not work well in wireless medium
    • TCP inherently assumes that packet loss is due to congestion
    • Needs modification for wireless network
slide12

802.16

120Mbps

Source: Matt Welsh, Harvard University

wifi network
WiFi Network

Basic Service Set

Access Point

Wireline network

g

Access Point

wifi network1
WiFi Network
  • 802.11b and 802.11g Use 2.4 GHz ISM band
  • 802.11b : 11 Mbps
  • 802.11g : 54 Mbps
  • 802.11a : uses 5 GHz band: 54Mbps
bluetooth
Bluetooth
  • Short range (10m),moderate data rate (720kbps) for creating an adhoc network between personal devices
  • One master and upto

7 slaves in a piconet

  • Master controls the transmission

schedules of all the devices

    • TDMA scheduling
  • Frequency hopping used to

avoid interference with other

piconets

    • 79 channels in the 2.4GHz ISM

band, with 1 MHz spacing

    • Frequency hopping at 1600 hops/s

PICONET

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