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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


It 601 mobile computing 1347179

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