MOBILE COMPUTING IMPORTANT QUESTIONS 2013

IT 1402 MOBILE COMPUTING

QUESTION BANK

Two Marks Questions:

1. Define the relation between the data rate and bandwidth. What has harmonics to do with bandwidth?
2. Define channel capacity in terms  of Nyquist a criteria and Shannon’s  formula.
3. Define  an equation for free space loss in terms of db.
4. What is ISI? 
5. List the parameters of GSM and IS – 95 system. 
6. What do you understand by co channel interference and adjacent channel interference.

7.What factors influence the choice of digital modulation technique

8.What is soft and hard handoff?

9.What is meant by  Coherent Bandwidth

10.What is meant by Coherent Time.

11.List and briefly describe different Media Access Mechanisms of Mobile Systems.

12.Describe the  services provided by GSM network.

13.What is authentication and how it is carried out.

Four marks questions:

1.      If the spectrum of the channel is  between 3 MHz and 4MHz and SNR in db = 24 db, then find the channel capacity using Shannon’s formula and based on Nyquist formula how many signaling levels are required  to have  to reach the given channel capacity.?

2.      List  modulation technique that are synchronous and asynchronous?  Briefly explain variants of Phase Shift Keying with suitable diagrams

3.      Given a channel with an intended capacity of 20 Mbps, the bandwidth  of the channel is 3 MHz. What signal to noise ratio is required to achieve this capacity?

4.      What is Eb / No  ? How it is related to BER (Bit Error Rate)

5.      Briefly describe multi path  propagation mechanism in mobile communication. What are its effects

6.      Given a channel with an intended capacity of 20 Mbps, the bandwidth of the channel is 3 MHz.  What is the signal to noise  required to achieve this capacity?

7.      Briefly explain the concept of spread spectrum with a neat diagram. How spread spectrum  overcomes narrowband  interference?

8.      What is near and far field effect?

9.      What are hidden and exposed terminals? What is CSMA/CA? How does prevent collision? What are its draw backs?

10.  List and explain various mobile services of GSM?

11.  What are Traffic channel and control channel?

12.  Define the following:

a.       MSISDN

b.      IMSI

c.       TMSI

d.      MSRN

13.How authentication is carried out in GSM?

14. How privacy is provided inGSM?

Eight Marks questions:

1. What is channel capacity?  How Nyquist and Shannon relate the channel capacity with bandwidth and hence with  bit rate? How multiplexing is important in communication? List and briefly explain different types of multiplexing mechanism giving there advantages and disadvantages.

2.  Suppose a transmitter produces 50 watts  of power.

1. Express the transmitter in units of dbm and dbw.
2. If the transmitter’s power is applied to a un ity gain antenna with a 900 MHz  carrier frequency, what is the received  power in dbm at a free space  distance of 100 m.
3. Repeat (b) for a distance of 10 km.
4. Repeat (c) but assume a receiver antenna gain of  2.

3.  What is fading? What are its classifications? Briefly describe them all by bringing  out  their salient feature.

4.    Briefly describe FHSS and DSSS with neat diagrams.

5.    Draw and describe the system architecture of  GSM  System.

6.    What is radio interface? How it is  made up of in GSM?

7.    List and discuss various control channels in GSM

8.    Draw and describe protocol architecture of GSM

9.    How localization of a subscriber is carried out in GSM  

10.  What is  ‘handover’ in mobile system? How it is effected in GSM?

Twelve Marks questions:

1. Briefly describe DAMA, PRMA, MACA, CDMA
2. Explain the term interference in the space, time, frequency and code domain.  What are the countermeasures in SDMA, TDMA,FDMA and CDMA systems?
3. How security is provided in GSM for the subscribers?

IT1402                  MOBILE COMPUTING                                                                  3  0  0  100

AIM

To provide basics for various techniques in Mobile Communications and Mobile Content services.

OBJECTIVES

·         To learn the basics of Wireless voice and data communications technologies.

·         To build working knowledge on various telephone and satellite networks.

·         To study the working principles of wireless LAN and  its standards.

·         To build knowledge on various Mobile Computing algorithms.

·         To build skills in working with Wireless application Protocols to develop mobile content applications.

UNIT I  WIRELESS COMMUNICATION FUNDAMENTALS                                            9

Introduction – Wireless transmission – Frequencies for radio transmission – Signals – Antennas – Signal Propagation – Multiplexing – Modulations – Spread spectrum – MAC – SDMA – FDMA – TDMA – CDMA – Cellular Wireless Networks.

UNIT II                 TELECOMMUNICATION NETWORKS                                                  11

Telecommunication systems – GSM – GPRS – DECT – UMTS – IMT-2000 – Satellite Networks -  Basics – Parameters and Configurations – Capacity Allocation – FAMA and DAMA – Broadcast Systems –  DAB - DVB.

UNIT III     WIRLESS LAN                                                                                                     9

Wireless LAN – IEEE 802.11 - Architecture – services – MAC – Physical layer – IEEE 802.11a - 802.11b standards – HIPERLAN – Blue Tooth.

UNIT IV                MOBILE NETWORK LAYER                                                                  9

Mobile IP – Dynamic Host Configuration Protocol - Routing – DSDV – DSR – Alternative Metrics.

UNIT V                 TRANSPORT AND APPLICATION LAYERS                                      7

Traditional TCP – Classical TCP improvements – WAP, WAP 2.0.

TOTAL : 45

TEXT BOOKS

1.           Jochen Schiller, “Mobile Communications”, PHI/Pearson Education, Second Edition, 2003. (Unit I Chap 1,2 &3- Unit II chap 4,5 &6-Unit III Chap 7.Unit IV Chap 8- Unit V Chap 9&10.)

2.           William Stallings, “Wireless Communications and Networks”, PHI/Pearson Education, 2002. (Unit I Chapter – 7&10-Unit II Chap 9)

REFERENCES

1.              Kaveh Pahlavan, Prasanth Krishnamoorthy, “Principles of Wireless Networks”, PHI/Pearson Education, 2003.

2.              Uwe Hansmann, Lothar Merk, Martin S. Nicklons and Thomas Stober, “Principles of Mobile Computing”, Springer, New York, 2003.

3.              Hazysztof Wesolowshi, “Mobile Communication Systems”, John Wiley and Sons Ltd, 2002.

** Only highlighted portion to be included  for first unit test.

ANNA UNIVERSITY

B.E/B.TECH. DEGREE EXAMINATIONS: NOV/DEC 2011

REGULATIONS: 2008

SEVENTH SEMESTER: INFORMATION TECHNOLOGY

080250043- MOBILE COMPUTING

Time: 3 Hours                                                                   Max Marks: 100

Part –A

(10×2=20 Marks)

ANSWER ALL THE QUESTIONS

1. List the limitations of mobile computing.
2. Give the name of any four mobile communication protocols.
3. What is meant by exposed terminal problem?
4. Define cellular networks.
5. Write about tunnelling in Mobile Communications?
6. Define Multicasting.
7. List the features of Windows CE operating systems.
8. What is meant by timeout freezing?
9. Define middleware.
10. What is meant by clustering?

Part –B

(5×16=80 Marks)

ANSWER ALL THE QUESTIONS

11. (a)(i) Explain the various types of switching techniques. (6)
(ii) Give the detailed discussion of various multiplexing techniques with example. (10)

(OR)

       (b)(i) Give the discussion of mobile system networks. (8)
(ii) Explain GSM architecture with appropriate diagram. (8)
12. (a)(i) Discuss the main features of spread spectrum. (8)
(ii) Explain the frequency management and channel assignment in cellular networks. (8)

(OR)

       (b) Explain the need of coding techniques. Give the detailed discussion of various coding techniques used in CSMA.
13. (a)(i) Discuss the route optimization techniques in mobile network layer. (8)
(ii) Write about DHCP protocol and its functions. (8)

(OR)

       (b) Give the detailed discussion of handover management and location management in mobile IP network layer.

14. (a) Explain four methods used for congestion control in mobile transport layer.

(OR)

       (b) Explain the following
(i) Indirect TCP. (8)
(ii) Snooping TCP. (8)
15. (a) Explain the mobile agent architecture with appropriate diagram.

(OR)

       (b) Give the detailed discussion of energy efficient communication methods used in wireless networks.
***** ALL THE BEST *****