MC November, 2011 Set4

IV B.Tech. I Semester Regular Examinations, November, 2011
MOBILE COMPUTING
(Common to Computer Science & Engineering, Information Technology and Electronics &
Computer Engineering)
Time: 3 Hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
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1. a) What are the limitations of a GSM cell in terms of diameter and capacity (voice, data)
for the traditional GSM, HSCSD, GPRS? How can the capacity be increased?
b) What are the reasons for the delays in the GSM system for packet data traffic?
Distinguish between circuit switched and packet-oriented transmission.
2. a) What is the reason for the failure of MAC schemes in wireless networks? What is
done in wired networks to avoid this effect?
b) Explain about FDMA.
3. a) What is IP packet delivery? Explain it.
b) What is reverse tunneling? What additional routes do packets take if reverse tunneling
is required?
4. a) Compare the different types of transmission errors that can occur in wireless and wired
networks. What additional role does mobility play?
b) Explain mobile TCP. How does a supervisory host send TCP packets to the mobile
node and to a fixed TCP connection? Give the advantages and disadvantages of
mobile TCP.
5. a) Explain about power-aware computing.
b) Explain stateless and stateful cache invalidation mechanisms.
6. a) Describe push-based data-delivery mechanism. What are the advantages and
disadvantages of push-based data dissemination?
b) Explain the following selective tuning and indexing techniques.
i) Directory method ii) Hash-based method
7. a) Describe the properties of MANETs.
b) Explain the dynamic source routing algorithm in MANETs.
8. a) Explain the functions of radio and baseband sublayers in Bluetooth.