UPTU Previous Year Question Papers
B Tech 8th Semester
Mobile Computing 2006-07
Notes : (1) Attempt all the questions. All questions carry equal marks.
(2) Use suitable diagram wherever necessary.
1. Attempt any four of the following :
(a) Compare the palm OS and windows CE OS based devices.
(b) Define mobile computing and explain its four- paradigms / principles.
(c) What are the main problems in signal propagation ? Why is reflection both useful and harmful ?
(d) List four differences in fixed-assigned multiple access and demand assigned multiple access schemes.
(e) List factors responsible for making routing in Ad-hoc network difficult and explain each in brief.
(f) Explain the type of the services offered by bluetooth.
(g) If 40 MHz of total spectrum is allocated for a duplex wireless cellular system and each simplex channel has 50 kHz RF bandwidth, find number of duplex channels and the total number of channels per cell site, if N (no. of cells / cluster) = 4 cell reuse is used.
2. Attempt any two of the following :
(a) What is the principal of frequency reuse in the context of cellular networks ? Explain five ways of increasing the capacity of a cellular system.
(b) Explain the various issues in mobile data management.
(c) Explain how the following operations are handled in Coda file system :
(i) Interprocess communication
(ii) Disconnected operation.
3. Attempt any two of the following :
(a) What is agent advertisement and discovery ? Explain with neat and clean diagram the need of registration and registration process in mobile IP.
(b) Apart from dropping packets due to a handover or higher bit error rates, the occurrence of lengthy and/or frequent disconnection is also a problem in mobile network. Explain, how Mobile TCP protocol overcomes this problem. Also list main advantages and disadvantages of this solution.
(c) What is the use of pointer forwarding strategies ? Explain any one such
4. Attempt any two of the following :
(a) Discuss in brief the fault tolerance system design strategies used in mobile computing.
(b) What are mobile agents ? Discuss their primary advantages over other approaches.
(c) What is the main purpose of Wireless Transaction Protocol (WTP) ? Explain various classes of transaction services provided. With the help of suitable diagrams, also explain the working of the WTP class 2 services.
5. Attempt any two of the following :
(a) Discuss the applications ad hoc networks. Also explain why routing is difficult in ad hoc networks ?
(b) Write short note on :
(i) Fisheye State Routing (FSR)
(ii) Destination Sequenced Distance-Vector (DSDV).
(c) Explain the salient characteristics of ad hoc networks and describe global state routing algorithm.