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(Following Paper   illand Roll No.   to be f illed in your   Answer Book )

• Roll No.

M.C.A.

(SEM.   V) ODD SEMESTER   THEORY   EXAMINATION

2010-11

MOBILE COMPUTING

Note:   (1) Attempt   all questions.

L~~.   "

\

.(4)   No second answer book will be provided.   ,

(a)   Discuss the  architectural details ofGSM. How is security

implemented   ,inGSM?

(b) Discuss diffe'rent channel allocation techniques used in

cellular system .• . . • . . . •

.../   (c)   How is the security maintained in GSM with A3,   AS   and 

A8 algorithm? Explain with appropriate diagram.

(d) How do HLR-VLR help in managing the location of mobile? Explain with necessary signaling sequence.

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(e) How   does CDMA allow each station   to  tr~,;smit over thef  ..

entire freq uency spectr um all the time?   Ex plain with suita ble

example.

(f )   Distinguish between   High   Speed Cir cuit   Switched    Data

(HSCSD)   and   General   Packet    Rad io Service   (GPRS)of GSM   stand ard. What   architectural   additions need to be

mad e in existing   GSM   to  have sup port ofGPR S   ?

(a) Distinguish between DCF   and PCF in context to wireless

LAN. Explain   their coexistence in wireless LAN with

ap propriate diagr ~.-.-

(b)   Compar e   IEEE   802.11   and Bluetooth with   r egar d to their 

adhoc   capa bilities. Where is   the   focus   of these

technologies?

(c) Sketch a neat diagram showing the Bluetooth protocol   stack .

State the functions of the following layers:

(i) Radio Layer 

(ii) Baseband    Layer 

(ill) L2CAP layer .

(d ) Why does the wired TCP need  modifications f or  its wir eless

implementations?   Discuss anyone approach f or mak ing it

adaptive to wireless scenario.

(e) Explain dif ferent   components   and   inter f aces   of the   WAP

architectur e with   suitable   d iagram.

(f)   How   d oes I~   address   problem   r esolved    in wir eless

internet? Ex plain   with   suitable d iagram.

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(a) Discuss   the impact   of  mobile computing   on the   following

aspects of   d ata   management:

~

(iii)   Query Processing.

(b) Explain the concept of cluster ing and discuss   the distr i buted 

cluste~ng scheme/algorithm.

(c)   How does mobility affect data re plication when we consider 

replicating on mobile   platform?   Discuss differ ent possi ble

replicating schemes when both client and servet; move only

within   their home location servers.

(a) Differentiate between block ing and non-blocking mobile

agent execution. Explain the concept of te plication and 

check pointing   type   f ault-tolerance   schemes.

(b) What   is mobile agent? What ar e the benef its/good reasons

f or  using   mobile agents? Discuss the classif ication of faulttolerance   schemes   f or   mobile   agents.

(c)   Discuss   var ious   issues related to tr ansaction processing in

mo bile com puting envir onment.

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(a) What   is adhoc networks? What are different   MAC issues

in adhoc networ ks and how are they addressed ?

(b)   (i)   Define the following and name a protocol of each

category :

(a) Pro.active protocols

( b) R eactive protocols

(c)   Hybrid protocols.

(ii) Explain the destination sequenced distance vector 

routing (DSDV) protocol.

(c) Discuss the Ad hoc on Demand Distance vectors (AODV)

routing protocols. How is it differ ent than standard clistance

vector algorithm   ?