UPTU Previous Year Question Papers B Tech Mobile Computing 2006-07


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.

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