Mobile Computing - MIDSEM Test

Q.1

a.What is the relationship between a base station and a mobile switching center?

b.What is the maximum number of callers in each cell in a GSM?

c.Explain briefly the functions of Host Controller Interface (HCI) and Service Discovery Protocol (SDP).

d.What is Hidden Terminal and Exposed Terminal problem? Explain.

e.Mention atleast four limitations/challenges that wireless LAN technology needs to

overcome.

f.Differentiate between adjacent channel and co-channel interference.

g.What is objective of WEP? How it is achieved?

Q.2

a.Explain the term interference and countermeasures in SDMA, TDMA, FDMA and

CDMA systems(8)

b.Discuss various identifiers/addresses-IMEI, IMSI, MSISDN, MSRN, LAI, TMSI,LMSI, CI and BSIC

-provided in GSMD istinguish between user related and system related identifiers.(10)

Q.3

a.Describe Bluetooth architecture and protocol. Also discuss its limitations.(10)

b.What are the several requirements that accompanied the development of the mobileIP as a standard to

enable mobility in the internet?(8)

Q.4

a.How is handoffs in cellular mobile communication affected by handoff threshold and

minimum acceptable signal level? Illustrate Hard Handoff and Soft Handoff incellular mobile communication systems.(6)

What do you mean by the following terms: AUC, HLR, VLR, and EIR? Explain

briefly.(8)

c.Looking at the HLR/VLR database approach used in GSM—how does this architecture limit the scalability in terms of users, especially moving users?(4)

Q.5

a.What are the different types of Inter Frame Space (IFS) used by IEEE 802.11protocol? Explain their purpose.(4)

b.

Explain in brief the Frequency Hopping Spread Spectrum (FHSS) technique

.

(4)

c.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 problems.(10)

Q.6

a.Give an overview of mechanism, advantages and disadvantages of following classical

enhancements to TCP for mobility:(12)

(i) Indirect TCP

(ii)Snooping TCP

(iii) M-TCP

(iv) Fast retransmit /fast recovery

b.Discuss two basic transport mechanisms used by Digital Audio Broadcasting (DAB).(6)

Q.7

a.What are the functions of authentication and encryption in GSM? How is system

security maintained?(4)

b.Discuss three different forms of human-computer interaction:active, passive and coercive with respect to pervasive computing.(6)

c.Discuss working of Mobile agent. For what types of applications mobile agents are suitable?

 

Que. 1
(1) List different types of transformations.
(2) Explain Briefly: OHA
(3) What are the different types of android platform available
(4) List indicator which are used to display data to users
(5) List tab available in Android Manifest File.

Que 2(a)What is gradient? How many types of gradient available. Write a program to draw circle with any one gradients.03
(b)What are the important android terminologies? Explain briefly.03
OR
(b)List different dialog box available in android application and explain any one with example.03
Que 3.Explain Lifecycle of android Activity with diagram.06
OR
Que 3.What are the uses of Android Manifest File explain briefly.06
Que 4.What is style and theme? How to create and use it.06
OR
Que 4.What is resource? List different types of resources available in android application. Explain /res/values/ Android Resource Directories and its resources.06
Que 5.Write android application which accept username and password and if user enter ‘gardi’ and ‘mca’ for username and password respectively, then it will transfer control to other page. If login fail then display appropriate message.06
OR
Que 5.Write android application which contains list of cars in list view and if user select any car then it should display its detail in new page like car model, color, average and price.


Que. 1
(1) List different types of transformations.
(2) Explain Briefly: OHA
(3) What are the different types of android platform available
(4) List indicator which are used to display data to users
(5) List tab available in Android Manifest File.

Que 2(a)What is gradient? How many types of gradient available. Write a program to draw circle with any one gradients.03
(b)What are the important android terminologies? Explain briefly.03
OR
(b)List different dialog box available in android application and explain any one with example.03
Que 3.Explain Lifecycle of android Activity with diagram.06
OR
Que 3.What are the uses of Android Manifest File explain briefly.06
Que 4.
What is style and theme? How to create and use it.06
OR
Que 4.What is resource? List different types of resources available in android application. Explain /res/values/ Android Resource Directories and its resources.06
Que 5.Write android application which accept username and password and if user enter ‘gardi’ and ‘mca’ for username and password respectively, then it will transfer control to other page. If login fail then display appropriate message.06
OR
Que 5.Write android application which contains list of cars in list view and if user select any car then it should display its detail in new page like car model, color, average and price.
Que. 1
(1) List different types of transformations.
(2) Explain Briefly: OHA
(3) What are the different types of android platform available
(4) List indicator which are used to display data to users
(5) List tab available in Android Manifest File.

Que 2(a)What is gradient? How many types of gradient available. Write a program to draw circle with any one gradients.03
(b)What are the important android terminologies? Explain briefly.03
OR
(b)List different dialog box available in android application and explain any one with example.03
Que 3.Explain Lifecycle of android Activity with diagram.06
OR
Que 3.What are the uses of Android Manifest File explain briefly.06
Que 4.What is style and theme? How to create and use it.06
OR
Que 4.What is resource? List different types of resources available in android application. Explain /res/values/ Android Resource Directories and its resources.06
Que 5.
Write android application which accept username and password and if user enter ‘gardi’ and ‘mca’ for username and password respectively, then it will transfer control to other page. If login fail then display appropriate message.06
OR
Que 5.Write android application which contains list of cars in list view and if user select any car then it should display its detail in new page like car model, color, average and price.

Que. 1
(1) List different types of transformations.
(2) Explain Briefly: OHA
(3) What are the different types of android platform available
(4) List indicator which are used to display data to users
(5) List tab available in Android Manifest File.

Que 2(a)What is gradient? How many types of gradient available. Write a program to draw circle with any one gradients.03
(b)
What are the important android terminologies? Explain briefly.03
OR
(b)
List different dialog box available in android application and explain any one with example.03
Que 3.Explain Lifecycle of android Activity with diagram.06
OR
Que 3.What are the uses of Android Manifest File explain briefly.06
Que 4.What is style and theme? How to create and use it.06
OR
Que 4.What is resource? List different types of resources available in android application. Explain /res/values/ Android Resource Directories and its resources.06
Que 5.Write android application which accept username and password and if user enter ‘gardi’ and ‘mca’ for username and password respectively, then it will transfer control to other page. If login fail then display appropriate message.06
OR
Que 5.Write android application which contains list of cars in list view and if user select any car then it should display its detail in new page like car model, color, average and price.

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 *****