Anna University Questions - CS9352 Mobile and Pervasive Computing April may 2014, Computer Science and Engineering (CSE), Sixth semester, regulation 2008
Exam
|
B.E/B.Tech. (Full
Time) DEGREE END SEMESTER EXAMINATIONS
|
Academic
Year
|
April May 2014
|
Subject
Code
|
CS9352 |
Subject
Name
|
Mobile and Pervasive Computing |
Branch
|
Computer Science and Engineering
|
Semester
|
Sixth Semester
|
Regulation
|
2008
|
B.E
/ B.Tech. (Full Time) DEGREE END SEMESTER EXAMINATIONS, APRIL / MAY 2014
Computer Science
and Engineering
Sixth Semester
CS9352
MOBILE AND PERVASIVE COMPUTING
(Regulations 2008)
Time : 3 Hours Answer A L L Questions Max. Marks 100
PART-A
(10 x 2 = 20 Marks)
1. Why electromagnetic waves with low
frequency cannot be used for data transmission in computer networks?
2. A cellular system uses FDMA with a
spectrum allocation of 25.5 MHZ in each direction, a guard band at the edge of
the allocated spectrum of 20 kHz and a channel bandwidth of 40 kHz. Calculate
the number of available channels.
3. Enumerate the power saving modes of
Bluetooth technology with its appropriate addressing scheme.
4. Express various Inter Frame
Spaces(IFS) of the IEEE 802.11 MAC protocol in terms of slot time.
5. How can you overcome the looping
problems in ad hoc routing algorithms?
6. State when DHCPRELEASE is invoked
in DHCP protocol?
7. List down the limitations of
traditional TCP in wireless networks.
8. Write a WML script to convert meter
to centimetre on mobile phone.
9. Define pervasive computing.
10. What type of context information
required to develop a navigational system for a car?
Part-B
(5* 16 = 80 Marks)
11. i. With a neat diagram explain the
functional architecture of the GSM system. (10)
ii. Explain the message flow diagram
for Mobile Originated Calls (MOC). (6)
12. a. i. Using IEEE 802.11, 5
stations are trying to access the medium during the following (16)
timings. S2 -10.00 am, S1-after 10 ms,
S4 -after 4 ms, S5- after 20ms S3 after 2ms. DIFS -15ms, Back off time for the
station S1, S2, S3, S4 and S5 are 7ms, 1ms, 6ms, 10ms,4ms respectively. Packet
transfer time after accessing the medium by St, S2, S3, S4 and S5 are 8ms,
18ms, 9ms, 17ms and 15ms respectively. Give the timing diagram for accessing
the medium and transferring the data by all the stations and also show the time
taken to complete the transactions using DFWMAC-DCF.
(OR)
12. b. i. Explain how are fairness
problems regarding channel access can be solved in IEEE 802.11 and HIPERLAN?
12. b. ii. Explain the schematic
architecture of Bluetooth. (8)
13. a. i. Consider a mobile node MN
from network X. The user of MN wishes to communicate with a corresponding node
CN in network Y. The node MN moves from X to a foreign network A. Describe the
sequence of messages that are required in Mobile IPv4 so that MN and CN can
continue to communicate. Include both the user data messages and the Mobile IP
control messages.
Now, consider the case where CN moves
to foreign network B while MN is still in the foreign network A. Can CN and MN
still communicate? (Does Mobile IP support both endpoints moving?) Show the
message flow to indicate how it will succeed or fail in this case.
(OR)
13. b. i. How Dynamic Source Routing
(DSR) algorithm handles routing for ad hoc network? How does it overcome the
looping and count to infinity problem? Illustrate with an example.
14. a. i. Give the WAP architecture
and explain how the secure session is established by the Wireless Transport
Layer Security (WTLS ) between the originator and the peer.
(OR)
14. b. i. Compare and contrast l-TCP,
Snooping TCP and Mobile TCP. (16)
15. a. i. Why and when do the
following device technologies receive preference by the designers of portable
computing devices which may become part of larger pervasive computing
solutions:
(i) Force-feedback-based (Haptic)
interfacing technology
(ii) Tegic T9-based Keypad technology
(iii) Speech-recognition-based input
technology
(OR)
15. b. i. Explain Windows CE and Palm
OS with its respective strength and weakness. Support your answer with the
development cycle.
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