According to the Revised Syllabus of ANNA UNIVERSITY- Tiruchirapalli

EC1451-MOBILE AND WIRELESS COMMUNICATION For VIII th Semester Electronics and communication Engineering

ByMrs S.Deva Priya,M.Tech, (PhD).,

HOD/ECE, Jayaram college of Engineering and Technology,

Trichy.R.Anbarasan B.E.,

Engineer/Project-Trainer, Embedded plus solutions,

Trichy.

MODEL QUESTION PAPER -1 B.E/B.Tech. DEGREE EXAMINATION EIGTH SEMESTER ELECTRONICS AND COMMUNICATION ENGINEERING EC1455 MOBILE AND WIRELESS COMMUNICATION Time: Three hours Maximum:100 marks

Answer ALL questions: PART A-(10 x2=20)

1. What is meant by Linear modulation ?Please Refer to section 1.2.2 in Unit 1.

2. Define Path Loss?Please Refer to Q.no 16 in Unit 1

3. What are the principles used in Secret key Algorithms.Please Refer to section 2.4.1.1 .

4. what is meant by Ping pong effect?Please Refer to Q.no 3 in Unit 2.

5. Define Dynamic topology. Please Refer to section 3.4.6. when did the 1st ad-hoc wireless networks started? 1973.7. Define COA? Please Refer to Q.no 14 in Unit 4..8. Define Encapsulation? Please Refer to Q.no 16 in Unit 4..9. Who developed GloMoSim. Parseac10.Name the languages used in NS2.C++, OTcl.

PART B-(5 x16=80)11).a) Explain how DPSK avoids the need for a coherent reference signal at the receiver and explain its Transmitter. Please Refer to section 1.2.2.2 b) Explain the features of CDMA . Please Refer to section 1.6.2 Or12)a) Explain Frequency Reuse with neat diagram. Please Refer to section 1.8.3 b). Consider a transmitter which radiates sinusoidal carrier frequency of 1850MHz. For a vehicle moving 60 mph, compute the received carrier frequency if the mobile is moving (a)directly towards the transmitter, (b)

directly away from the transmitter, (c) in a direction which is perpendicular to the direction of arrival of the transmitted signal. Please Refer to Problem no 1 in unit 1.13) Explain briefly about Radio Resources and Power Management. Please Refer to section 2.2

Or14) Explain a)UMTS Please Refer to section2.12. b) IMT 2000 Please Refer to section 2.11. c) CDMA 2000. Please Refer to section 2.13

15).Explain how Route discovery and Route maintenance using Route Request ,Route Reply and Route Error signal in AODV. Please Refer to section 3.7.2.2 or16) .a).Explain Group Mobility Model with its types. Please Refer to section 3.8.1 b).Explain Random Waypoint Model. Please refer to section 3.8.2

17) a).Explain Authentication in Mobile Application. Please Refer to section 4.3 b). Explain about Security Issues in wireless networks. Please Refer to section 4.2 Or18).a). Explain DCF Mechanism. Please refer to section 4.5.1 b). Explain how Packets are Delivered to and from the mobile node. Please Refer to section 4.7.1 &4.7.219). Write briefly about GloMoSim with its architecture. Please Refer to section 5.2 Or20) a). What are 2 languages used in NS2.Why those 2 languages ? Please Refer to section 5.3 b). What are the steps required in writing a simulating script. Please Refer to section 5.3 c).Write the sample coding for Applications based on Sensor Networks. Please Refer to section 5.3

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MODEL QUESTION PAPER -2 B.E/B.Tech. DEGREE EXAMINATION EIGTH SEMESTER ELECTRONICS AND COMMUNICATION ENGINEERING EC1455- MOBILE AND WIRELESS COMMUNICATION Time: Three hours Maximum:100 marks Answer ALL questions: PART A-(10 x2=20)

1. What is meant by Maximal Length (ML) sequence? Please Refer to Q.no 7 in Unit 1.

2. Define Borrowing strategy? Please Refer to Q.no 14 in Unit 1.

3. What are the different types of power control? Please Refer to section 2.3.1 in Unit 2.

4. Define Handoff? Please Refer to section 2.2 in Unit 2. 5. Define redundant links. Please Refer to section 3.3 in Unit 3.6. What are the different types of Group Mobility Model?

Please Refer to Q.no 12 in Unit 3.7. Distinguish between Authentication and Identification.

Please Refer to Q.no 3 & 4 in Unit 4.8. Define Tunneling? Please Refer to section 4.7.2 in Unit 4.9. Name the language used in GloMoSim? Java.10.Who developed NS2. UC Berkeley

PART B-(5 x16=80)11).a)Draw and explain the QPSK and DPSK Transmitter and Receiver.

Please Refer to section 1.2.2.3 & 1.2.2.2 b) Derive Bandwidth ,PSD and Probability of Error for QPSK and BPSK. .

Please Refer to section 1.2.2.3 & 1.2.2.1 Or

12.a) Write about Handoff Strategies. Please Refer to section 1.8.5 b) Write about SDMA with suitable diagram. Please Refer to section 1.7

c). Consider a transmitter produces 50 watts of power, If 50 watts is applied to a unity gain antenna with a 950MHz carrier frequency, find the received power at free space distance of 100 m from the antenna, Assume unity gain for antenna, L=1 and λ=1/3.Also find Path Loss. Please Refer to Problem no 3 in unit 1.13) Write about a) Public Key Algorithm. Please Refer to section 2.4.1.2 b) secret Key Algorithms. Please Refer to section 2.4.1.1 Or14) .Explain briefly about Mobility Management. Please Refer to section 2.215. a)Explain how route is discovered and maintained in DSR . Please Refer to section 3.7.2.1 b) Write about IEEE 1451 And Smart Sensors . Please Refer to section 3.5 Or16. a) Explain Random Waypoint Model. Please Refer to section 3.8.2 b)Write about LAR. Please Refer to section 3.7.3.1

17.a) Explain about Privacy Issues and Requirements in wireless networks. Please Refer to section 4.4 & 4.4.1 b)Explain briefly about VoIP Applications. Please Refer to section 4.5

. Or18. a)Why we need Mobile IP? Explain its Entities and terminology. Please Refer to section 4.7 b). Explain how packets are forwarded from home network to Foreign networks. Please Refer to section 4.7.1 &4.7.2 19.Write the format needed for a)TELNET. Please Refer to section 5.2.3 b).FTP and FTP/GENERIC. Please Refer to section 5.2.3 c).CBR. Please Refer to section 5.2.3 d).HTTP. Please Refer to section 5.2.3

Or

20) Explain about Network Simulator 2(NS2) with sample coding. Please Refer to section 5.3

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MODEL QUESTION PAPER -3 B.E/B.Tech. DEGREE EXAMINATION EIGTH SEMESTER ELECTRONICS AND COMMUNICATION ENGINEERING EC1455 MOBILE AND WIRELESS COMMUNICATION Time: Three hours Maximum:100 marks

Answer ALL questions: PART A-(10 x2=20)

1. Write the Rayleigh distribution expression for Multipath path fading? The most commonly used distribution for multipath fading is the

Rayleigh distribution, whose probability distribution function ( PDF) is given by

f ray(r) =r

σ2 exp (−r2

2σ2 ), r≥0.

2. Find the number of cells per cluster (N) if i=2 and j=1, where, i and j are non-negative integers.Ans: Number of cells per cluster (N) can be calculated by N=i2+¿ij+ j2 = 22+ (2)(1)+12 =7

3. The HV1 packets are 240 bits long, and so the are sent every six slots.The packets are 1-slot packets sent at the rate of 1,600 slots/sec.Find the rate at which packets sent.

Ans: = 1600(slots/ sec)

6(slots) x 240 (bits) =64kbps.

4. What is meant by cell global identification (CGI)? Please Refer to section 2.2 in Unit 2.

5. List out the types of wireless networks. Please Refer to section 3.2.2 in unit 3.

6. what is peer-to-peer networking (P2P)? Refer to section 3.6.7. write about VoIP Applications? A VoIP session is considered as a real-time bi-directional, point-to-point

connection between two users.

Usually it takes place over a standard network infrastructure, and demands a very well-configured network to run smoothly

8. what are the characteristics of VoIP Applications? 1). VoIP employs RTP protocol over UDP. 2).VoIP packets are small and packets intervals are short. 3).The efficiency of transmission is low

9. What are the three main functions have to be elaborated to add a new protocol? 1.Initialization Function:

2. Finalization Function. 3. Simulation Event Handling Function.10.Write about the structure of OPNET.

a)OPNET consists of high level user interface, which is constructed from C and C++ source code blocks with a huge library of OPNET specific functions

PART B-(5 x16=80)11.a)In the North American Narrowband TDMA cellular system, the one-way bandwidth of the system is 12.5 MHz. The channel spacing is 30 kHz and the totalnumber of voice channels in the system is 395. The frame duration is 40 ms, with six time slots per frame. The system has an individual user data rate of 16.2 kbps in which the speech with error protection has a rate of 13 kbps. Calculate the multiple access spectral efficiency of the TDMA system. Please Refer to Problem no 10 in unit 1. b).If a total of 33 MHz of bandwidth(BW) is allocated to a particular FDD cellular telephone system which uses two 25 kHz simplex channels to provide full duplex voice and control channels, compute the number of channels available per cell if a system uses (a) 4-cell reuse, (b) 7-cell reuse (c) 12-cell reuse. Please Refer to Problem no 2 in unit 1. Or12.a)Explain Fading. Please Refer to section 1.11 b) Write shortly about Path Loss. Please Refer to section 1.9. c Derive expression for Doppler Shift. Please Refer to section 1.12.13) Write about a) Public Key Algorithm. Please Refer to section 2.4.1.2

b) secret Key Algorithms. Please Refer to section 2.4.1.1

Or14) . a).We consider a WLAN installation in which the maximum propagation delay is 0.4 sec. The WLAN operates at a data rate of 10 Mbps, and packets have

400 bits.Calculate the normalized throughput with: (1) an unslotted nonpersistent, (2) a slotted persistent, and (3) a slotted 1-persistent CSMA protocol. Please Refer to problem number 6 in unit 2. b).The asymmetric DM5 link uses five slot packets carrying 1,792 bits per packets by the “M” and 1-slot packet carrying 136 bits per packet by the “S” terminal. The number of packets per second in each direction is 16006 packets per second. Find the data rate from “M” and “S”` terminals.

Please Refer to problem number 13 in unit 2.

15. How does dynamic source routing handle routing? What is the motivation Behind dynamic source routing compared to other routing algorithms from fixed networks? Please Refer to section 3.7.2.1.

or 16) a).Determine the transfer time of a 20kb file with a mobile data network with a transmission rate of 10kbps. b).Repeat for an 802.11 WLAN operating at 2Mbps. c).what is the length of the file that the WLAN of part (b) can carry in the time that mobile data services of part (a)carries its 20kB file? Please refer to problem number 1 in unit 3.17) a). Explain packet flow if two mobile nodes communicate and both are in foreign networks. What additional routes do packets take if reverse tunneling is required? Please Refer to section 4.7.

b).Show the steps required for a handover from one foreign agent to another foreign agent including layer 2 and layer 3. Please Refer to section 4.7.1 &4.7.2

Or18).a). What are the Methods available for token Authentication?

Please Refer to sec 4.3

b).Explain Authentication in Mobile Application. Please Refer to section 4.319). Write briefly about the structure of GloMoSim. Please Refer to section 5.2 Or20) a). What are 2 languages used in NS2.Why those 2 languages ? Please Refer to section 5.3 b). What are the steps required in writing a simulating script. Please Refer to section 5.3

c).Write the sample coding for Applications based on Sensor Networks. Please Refer to section 5.3.9 ***************

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B.E/B.Tech. DEGREE EXAMINATION.APRIL/MAY 2011.

EIGTH SEMESTER ELECTRONICS AND COMMUNICATION ENGINEERING EC1451 MOBILE AND WIRELESS COMMUNICATION Time: Three hours Maximum:100 marks

Answer ALL questions: PART A-(10 x2=20)

1. What is hand-off in cellular networks? Please Refer to Q.no 15 in unit 1.

2. What is the maximum data rate that can be supported in a 500KHz channel for SNR of 25dB? Please refer Problem no 12 in unit 1.

3. Define Tunnelling. Tunnelling is a process whereby information from one protocol is encapsulated inside the frame or packet of another architecture, thus enabling the original data to be carried over that second architecture.

4. Why CSMA/CD can not be used in wireless networks? Please refer to section 2.5.2

5. Name any two mobile Routing protocols. DSR,AODV,OLSR,ZRP ,etc

6. Mention any two salient features of Mobile IP?

1.Compatibility. 2.Transparency. 3.Scalability and efficiency. 4.Security.7. What are the main challenges of mobile networks?

Please refer sec 3.2.1

8. What is the main difference between Security and privacy in wireless networks? Please refer sec 4.2 and 4.4.

9. Who developed GloMoSim? GloMoSim uses a parallel discrete-event simulation capability provided by PARSEC

PARSEC (for PARallel Simulation Environment for Complex systems) is a C-based simulation language developed by the Parallel Computing Laboratory at UCLA, for sequential and parallel execution of discrete-event simulation models .

10.What is the importance of simulation tools? Please refer sec 5.4.5

PART B-(5 x16=80)

11.(a) Derive the probability of bit error for a BPSK Modulation. Please refer sec 1.2.2.1

(b) Draw the constellation diagram of an M-ary PSK systems for M=8.

Fig1: Constellation diagram of an M-ary PSK system (M=8).

Or12. (a) Explain the concepts of TDMA Scheme.Please refer sec 1.5.1 (b). Explain the hand-off process in cellular networks.

Please refer sec 1.8.5.

13. (a).Compare IEEE 802.11 a and IEEE 802.11b standards.

Please refer sec 2.7.

(b).What is the need for IPV6 protocol? Explain its advantages.

Please refer sec 2.9.2. Or

14. Briefly explain about (a).Location Management. Please refer sec 2.2.

(b).Resource Management. Please refer sec 2.3.

15. a).Explain the functionality of Ad-hoc networks. Please refer sec 3.3.

b).Explain the principal behind in DSR routing protocol. Please refer sec 3.7.2.1 or

16 .Write short notes on: a).Group Mobility Model. b).Point Mobility Model. c).Entity Based model

Please refer sec 3.8

17. a). what are the major security threats in wireless networks?Explain the solution for any two threats. Please refer sec 4.2.

b).How to provide the authentication in mobile networks? Explain. Please refer sec 4.3

(OR)

18.a). How does the packet delivery mechanism in the mobile IP protocol differ

from that IP protocol. Please refer sec 4.7.2. b).How does an agent discover its care of address when a mobile node visits a foreign networks? Explain. Please refer sec 4.7.3.

19.a)Explain the architecture of Network simulator. Please refer sec 5.3.1.

b).What are the different traffic models and application models implemented in Network simulator? Please refer sec 5.3.

Or20).a)Compare NS2 with GloMoSim. Please refer sec 5.2 and 5.3.

b).Explain the importance of config.in file in GloMoSim and Discuss the various propogation models supported by GloMoSim.

Please refer sec 5.2.3 and 5.2.7.

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B.E/B.Tech. DEGREE EXAMINATION.NOVEMBER/DECEMBER 2011.

EIGTH SEMESTER ELECTRONICS AND COMMUNICATION ENGINEERING EC1451 MOBILE AND WIRELESS COMMUNICATION Time: Three hours Maximum:100 marks

Answer ALL questions: PART A-(10 x2=20)1.What is the processing gain for FH systems?

Processing gain= W SS

B

Where W SS=total hopping bandwidth B=instantaneous bandwidth2.Define Doppler effect. Please refer to Q.no 35 in unit1.3.What is the major difference between 802.11a and 802.11b standards? Please refer to Q.no 8 in unit2.4.What is the difference between an access point and a portal?Wireless network infrastructure needs wireless transceivers to communicate with the wireless communication terminals and act as points of access to the fixed part of wireless network infrastructure.These transceivers are referred to as Base station or Access Point (AP). IEEE 802.11 defines portals as the logical points at which non 802.11 packets enters.5.What is the requirement to develop a new RP(Routing protocol) for a wireless networks? Simplicity and ease of implementation.

o Scalable.

o Secure and reliable.o Supporting Quality of Service requirements o Bandwidth, power, and computing efficient with minimum

overhead.6.Define Random way point model. Please refer to sec 3.8.27.What is meant by correspondent node?

At least one partner is needed for communication. The CN can be either fixed or mobile node.

8.What type of signaling protocol is required for VOIP applications? Please refer to sec 4.59.what protocol does NS2 support?

Wired Networking:1).Routing: Unicast, Multicast, and Hierarchical Routing, etc.

2).Transportation: TCP, UDP, others; 3).Traffic sources: web, ftp, telnet, cbr, etc. 4).Queuing disciplines: drop-tail, RED, etc. 5).QoS: IntServ and Diffserv Wireless Networking

Ad hoc routing and mobile IP Sensor Networks

1).SensorSim: built up on NS2, additional features, for TinyOS.10.What are the mobility models supported by GloMoSim? Please refer to section 5.3 PART B-(5 x16=80)11.(a).Compare 1st generation and 2nd generation wireless networks. Please refer to section 1.1.1 (b).Draw the block diagram of a DS-SS system with binary phase modulation and explain its functions. Please refer to section 1.3.1 Or12.Derive the bit error rate performance of binary modulation schemes in reyleigh flat fading channel and discuss its performance over AWGN channel. Please refer to section 1.4.313.(a).What are the limitations of wireless networks? Explain. Please refer to section 2.6. (b).Explain exposed and hidden terminal problem in IEEE 802.11. Please refer to section 2.7.

Or14.(a).Explain the performance of TCP over wireless networks. Please refer to section 2.10 (b).Explain the principle behind in all IP based networks. Please refer to section 2.16.15.(a).List the characteristics of Ad-hoc Networks and mention its application. Please refer to section 3.3. (b).Explain the route discovery process in AODV protocol. Please refer to section 3.7.2.2 Or16.(a).Compare the proactive and reactive protocols. Please refer to section 3.7 (b).What are the challenges of wireless sensor Networks? Mention its application Please refer to section 3.517.(a).What is the difference between security algorithm and security protocol?How they are related? Please refer to section 4.2 and 2.4 (b).Describe VOIP application. Please refer to section 4.5. Or18.(a).What are the different security issues in mobile networks? Please refer to section 4.2. (b).Describe message authentication and user identification schemes in wireless networks. Please refer to section 4.319.(a).Compare NS2 and GloMoSim. Please refer to section 5.3 and 5.2 (b).Explain the architecture of OPNET simulator. Please refer to section 5.4.1 Or20.(a).How to evaluate the performance of the routing protocol using NS2?Write the steps involved in it. Please refer to section 5.3 (b).Write the procedure to display the result in graphical form in NS2. Please refer to section 5.3 ***************