Mobile Computing - May 2012

Computer Engineering (Semester 7)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1(a) List the entities of mobile IP and describe data transfer from a mobile node to a fixed node and vice versa.(5 marks) 1(b) What advantages does the use of IPV6 offer for mobility?(5 marks) 1(c) How much of the original GSM network does GPRS need? Which elements of the network perform the data transfer? (5 marks) 1(d) What is Hidden and Exposed terminal problem? Discuss solutions to these problems.(5 marks) 2(a) Explain how the power management is done in IEEE 802.11 infrastructure based and adhoc networks.(10 marks) 2(b) Draw and explain architecture of GPRS network.(10 marks) 3(a) Explain IP-in-IP, Minimal and Generic encapsulation. Also discuss their merits and demerits.(10 marks) 3(b) Explain snooping TCP and mobile TCP with their merits and demerits.(10 marks) 4(a) Why is routing in multi-hop ad-hoc networks complicated? What are the special challenges?(10 marks) 4(b) What characteristics do the different orbits have? What are their pros and cons?(10 marks) 5(a) Explain Bluetooth protocol stack with neat diagram.(10 marks) 5(b) What are the functions of Authentication and Encryption in GSM.(10 marks) 6(a) Explain WATM reference model with several access scenarios.(10 marks) 6(b) What are the main benefits of Spread spectrum system. Explain direct sequence spread spectrum in detail. How can DSSS system benefit from multipath propagation.(10 marks)

Write short notes on any four of the following :-

7(a) Mobile agents(5 marks) 7(b) UMTS architecture and its domain.(5 marks) 7(c) WML(5 marks) 7(d) CDMA(5 marks) 7(e) HIPERLAN(5 marks)