Code No: R41054
R10
Set No. 1
IV B.Tech I Semester Regular Examinations, December - 2013
MOBILE COMPUTING
(Common to Computer Science & Engineering and Information Technology)
Time : 3 hours
Max. Marks: 75
Answer any Five Questions
All Questions carry equal marks
**
1 a) Outline the standards for Voice oriented data communication?
b) Define the far-field region in free space model. Find the far-field distance for
an antenna with maximum dimension of 1m and operating frequency of 600
MHz?
[8]
[7]
2 a) If a total of 30 MHz of bandwidth is allocated to a particular FDD cellular
telephone system which uses two 20 KHz simplex channels to provide full
duplex voice and control channels, compute the number of channels available
per cell if a system uses:
i) 7-cell reuse
ii) 15-cell reuse.
b) Write a short notes on Smart Systems?
[8]
[7]
3 a) What is the maximum number of callers in each cell in a GSM?
b) With a neat diagram explain GPRS architecture?
[6]
[9]
4 a) Compare characteristic features of CDMA and GSM.
b) Briefly discuss about IMT-20003G wireless communication standards?
[6]
[9]
5 a) Write short notes on Location management requirements in cellular systems?
b) Explain the functions of following layers with respect to wireless and mobile
environment: Physical layer, Data link layer, Network layer, Transport layer
and Application layer
[6]
6 a) Discuss working of Mobile agent. For what types of applications mobile agents
are suitable?
b) Explain Domain-dependant specific rules for data synchronization?
[8]
7 a) List out the applications of wireless sensors networks?
b) Explain Infrastructure level Security and System Level Security models in
mobile computing environment.
[7]
8 a) Briefly discuss about wireless datagram protocols (WDP)?
b) Write any two advantages and disadvantages of WLAN?
[7]
[8]
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[9]
[7]
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Code No: R41054
R10
Set No. 2
IV B.Tech I Semester Regular Examinations, December - 2013
MOBILE COMPUTING
(Common to Computer Science & Engineering and Information Technology)
Time : 3 hours
Max. Marks: 75
Answer any Five Questions
All Questions carry equal marks
**
1 a) Is directional antenna useful for mobile phones? Why?
[8]
b) Explain the modulation methods and standards for data and voice communication?
[7]
2 a) If a total of 30 MHz of bandwidth is allocated to a particular FDD cellular
telephone system which uses two 20 KHz simplex channels to provide full
duplex voice and control channels, compute the number of channels available
per cell if a system uses:
i) 4-cell reuse
ii) 12-cell reuse.
b) Write a short notes on mobile smart phones?
[8]
[7]
3 a) Explain the functioning of Network and Switching Subsystem (NSS) and its
registers in a GSM cellular system?
b) Explain in detail about Radio interfaces of GSM?
[7]
[8]
4 a) Compare and contrast between 3G and 4G communication?
b) Briefly discuss about Broadband wireless access?
[8]
[7]
5 a) Explain Mobile TCP. Give its advantages and disadvantages.
b) Describe in detail about mobile internet protocol?
[8]
[7]
6 a) Explain in detail about usage models for Synchronization in mobile application?
b) Discuss briefly about synchronization and conflict resolution strategies
[8]
[7]
7 a) List out the properties of MANETs.
b) With a neat sketch explain fixed infrastructure architecture in detail.
[7]
[8]
8 a) What are the different types of Inter Frame Space (IFS) used by IEEE 802.11
protocol? Explain their purpose.
b) Briefly discuss about wireless application protocol (WAP).
[8]
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[7]
Code No: R41054
R10
Set No. 3
IV B.Tech I Semester Regular Examinations, December - 2013
MOBILE COMPUTING
(Common to Computer Science & Engineering and Information Technology)
Time : 3 hours
Max. Marks: 75
Answer any Five Questions
All Questions carry equal marks
**
1 a) With a neat sketch explain the architecture of mobile computing.
[8]
b) Briefly discuss about guided transmission medium in mobile computing.
[7]
2 a) Define frequency reuse. If a total of 50 MHz bandwidth is allocated to a
particular cellular system which uses two 40 KHz simplex channels to provide
full duplex voice and control channels. Compute the number of channels
available per cell if a system uses:
i) Four-cell reuse
ii) Seven-cell reuse
b) Outline the limitations of mobile devices?
[8]
[7]
3 a) Looking at the HLR/VLR database approach used in GSM—how does this
architecture limit the scalability in terms of users, especially moving users?
b) Write short notes on Localization in GSM?
[8]
4 a) What are the benefits of spread spectrum? Describe frequency-hopping spread
Spectrum?
b) Describe in detail about 4G Networks.
[8]
5 a) Give the working of Mobile IP. Explain features of discovery, registration and
tunneling features of Mobile IP?
b) Briefly discuss about packet delivery in Mobile IP network layer.
[8]
6 a) Describe in detail about Personal information manager.
b) Explain in detail about mobile agents Design.
[8]
[7]
7 a) Explain in detail about MANET Infrastructure architecture?
b) Briefly discuss about security in Ad-hoc networks?
[9]
[6]
8 a) Mention at least four limitations/challenges that wireless LAN technology
needs to overcome?
b) Most wired LANs products use Carrier Sense Multiple Access with Collision
Detection (CSMA/CD) as the MAC protocol. However wireless topologies can
create a problem for CSMA/CD. What challenges must be dealt with by the
MAC used for IEEE 802.11? Discuss main steps of the solution to these
problem.
[6]
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[7]
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[7]
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Code No: R41054
R10
Set No. 4
IV B.Tech I Semester Regular Examinations, December - 2013
MOBILE COMPUTING
(Common to Computer Science & Engineering and Information Technology)
Time : 3 hours
Max. Marks: 75
Answer any Five Questions
All Questions carry equal marks
**
1 a) Outline the applications of mobile computing?
[8]
b) Explain in detail about mobile system networks?
[7]
2 a) What is reuse factor? Explain whether a low or a high reuse factor is better?
b) Briefly describe about handheld pocket computers?
[8]
[7]
3 a) What are the functions of authentication and encryption in GSM? How is
system security maintained?
b) Discuss briefly about call handling in GSM?
[8]
4 a) List and explain CDMA 3G Communication standards?
b) Explain in detail about coding methods?
[8]
[7]
5 a) What are the several requirements that accompanied the development of the
mobile IP as a standard to enable mobility in the internet?
b) Write short notes on Agent Discovery?
[8]
[7]
6 a) Explain in detail about Synchronization in mobile computing systems?
b) Briefly discuss about Application Server?
[8]
[7]
7 a) Describe in detail about wireless sensor networks?
b) Explain the role of spectrum in mobile ad-hoc networks?
[8]
[7]
8 a) Draw the architecture of Wireless LAN and mention any two advantages of
WLAN?
b) Discuss briefly about Wireless Transport Layer Security?
[8]
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