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Name of the College : Valliammai Engineering College
University : Anna University
Department : Information Technology
Subject Code/Name : IT2402-Mobile Communication
Degree : B.Tech – IT
Year : IV
Semester : VII
Document Type : Question Bank
Website : valliammai.co.in

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Mobile Communication Question Paper

Unit – I

Wireless Communication :
Part- A :
1. Draw the frequency assignment for radio transmission.
2. What is handoff? List out its characteristics.
3. Prove that Barker code has good auto correlation.

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4. Calculate the channel capacity C, given a bandwidth B as 3100Hz and a number of discrete signals M as 8.
5. What is the motivation for the specialized MAC?
6. Draw a model to illustrate the effect of hand off.
7. Why baseband signal cannot be directly transmitted in wireless systems?
8. What is p-persistent CSMA?
9. What is meant by frequency reuse?
10. Differentiate between soft and hard hand off.
11. What do you mean by dropped call rate?

12. What is co-channel reuse ratio?
13. List out the various types of handovers available.
14. If a total of 33 MHz of bandwidth is allocated to a particular FDD cellular telephone system which uses two 25 kHz simples channel to provide full duplex channels, compute the number of channels available per cell if a system uses (a) 4 cell reuse (b) 7 cell reuse.
15. What are the disadvantages of small cells?
16. How are guard spaces realized between users in CDMA?
17. What is the main reason to use cellular systems over telephone systems?
18. Distinguish between TDMA and CDMA
19. What are the categories of Mobile services?
20. What are the information in SIM.

Part – B :
1.What is a Cellular system? Give their advantages and disadvantages.
2.Explain in detail about the motivation of specialized MAC.
3.Compare the mechanisms of SDMA, TDMA, FDMA, and CDMA with their functions.
4.Discuss the principle and operation of cellular wireless networks in detail.
5.Explain clearly the various schemes for Medium access control with Time Division multiple access.
6.If a SIR of 15db is required for satisfactory forward channel performance of a cellular system, What is the frequency reuse factor and cluster size that should be used for maximum capacity if the path loss exponent is n=4? Assume that there are six co-channel cells in the first tier and all of them are at the same distance from the mobile. Use suitable approximations.
7.List the various performance metrics used to make the decision with reference to handoff.
8. i) Discuss on the frequency reuse concept.
ii) Explain the concept of cell splitting in cellular system
9.Describe in detail for channel assignment and frequency management.
10. Consider three users and Barker code of six bits each for the users transmitting the signals, introduce noise and near/far problem while transmitting and reconstruct the data in the receiving side providing the proper countermeasures for the complications.(Note :use CDMA technologies).

Unit- II

Wireless Networks :
Part- A :
1. Give examples for Mobile adhoc networks.
2. Define adhoc wireless networks with example.
3. What are the three low power states of a Bluetooth state?
4. What is wireless local loop?
5. Why cannot wireless LANs implement CSMA/CD?
6. Why is WiMAX forum formed?
7. Differentiate between WiFi and WiMAX.
8. Why do hidden and exposed terminal problems arise?
9. Differentiate Broadcast from Multicast.
10. What are the main benefits of spread spectrum system?
11. Why is the physical layer in IEEE 802.11 subdivided?
12. What are the several versions of CSMA?
13. Compare infrared and radio transmission.
14. What are the 2 sub layers in DLC?
15. List any 2 disadvantage of WLAN.
16. Define random back off time.
17. Mention the design goals of WLANS?
18. What do you mean by polling?
19. Define frequency hopping spread spectrum.
20. What are fundamental difference existing between wired and wireless network?

Part – B :
1. Explain in detail about the system and protocol architecture of IEEE 802.11.
2. Discuss the advantages and disadvantages of WLAN.
3. Explain the MAC Management 802.11.List the two MAC sublayers defined by IEEE 802.11.
4. Describe the functions of MAC and Physical Layer of IEEE 802.16 in detail.
5. Write short notes on wireless local loop.
6. With suitable diagram explain the extended service set.
7. Discuss the difference between IEEE 802.11a and IEEE 802.11b.
8. Explain WiFi and WiMax.
9. Write short notes on mobile ad hoc networks.
10. Explain MANET in detail.

Unit – III

Mobile Communication Systems :
Part- A :
1. What is mobile number portability?
2. Define VOIP.
3. What are the advantages of GPRS?
4. What are the types of handover in GSM?
5. List the standards similar to GSM.
6. Draw the GPRS transport plane.
7. What are the advantages of digital cellular systems over Analog cellular Systems?
8. What is PDP?
9. Name the speech coder types used in GSM and CDMA.
10. What is visitor Location Registers?
11. What are the reasons for delays in GSM for packet data traffic?
12. What is MTC and MOC?
13. What is meant by beacon?
14. What is meant by SIFS and PIFS?
15. What are the advantages of wireless LAN?
16. What are the advantages of DAB?
17. What is object repetition?
18. What is Active and passive scanning?
19. What are design goals of wireless LAN
20. Differentiate between 2.5 and 3G wireless networks.

Part – B :
1. Explain in detail about the system architecture of Global System for Mobile communication.
2. Discuss in detail the various handover scenarios in GSM.
3. Describe the reliability and delay classes in GPRS. Also explain the GPRS procedures.
4. Explain the security services of GSM.
5. Explain the reference architecture of GSM.
6. Explain the network services of GPRS and mobility support in GPRS.
7. What are the functions of authentication, encryption in GSM? How is system security maintained.
8. Discuss the steps in Mobile terminated call and Mobile originated call.
9. Explain in detail (a) Attach and detach procedure (b) Combined RA/LA update.
10. Explain the following (a) PDP context procedures (b) GSM location update procedures.