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IT 601: Mobile Computing

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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IT 601: Mobile Computing

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  1. Session 1 Introduction Prof. Anirudha Sahoo IIT Bombay IT 601: Mobile Computing

  2. Course Evaluation • Home assignment – 10% • Pop Quizzes – 5% • MidSem – 25% • Project – 25% • EndSem – 35%

  3. 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

  4. Prerequisite • Basic Computer Networks • Sound knowledge in traditional MAC protocols • IP routing protocols • TCP • Basics of Probability theory and queuing theory

  5. 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

  6. Introduction • What is different in wireless network? • Bandwidth • Error rate • Media • Signal strength (fading) • MAC • Mobility • Security

  7. 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

  8. Physical Layer (PHY) • Binary (digital) data transmitted over airwave • Requires antenna • characterized by transmission range, power, modulation scheme, frequency range

  9. 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

  10. Network Layer • Responsible for facilitating multihop communication • Need to run some routing protocol • Traditional routing protocols may not work efficiently • Mobility at IP layer

  11. 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

  12. 802.16 120Mbps Source: Matt Welsh, Harvard University

  13. WiFi Network Basic Service Set Access Point Wireline network g Access Point

  14. 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

  15. 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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