94975895 Mobile Computing and Simulation April 2012

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Paper 3-March’2012 Mobile Communication and simulation Con. 2466-12. (3 Hours) N.B.: (1) Attempt any three questions from each section. (2) Answer to the two sections must be written in separate answer books. (3) Figures to the right indicate full marks. (4) Use of simple calculator is allowed. (5) Abbreviations have their usual meanings unless stated otherwise. SV 1032 Total Marks : 75 Section I 1. (a) Explain the multiplexing technique used by cellular systems for mobile communications. Wri
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  Paper 3- March’2012   Mobile Communication and simulation Con. 2466-12.   SV 1032(3 Hours) Total Marks : 75 N.B.: (1) Attempt any three questions from each section. (2) Answer to the two sections must be written in separate answer books.(3) Figures to the right indicate full marks.(4) Use of simple calculator is allowed. (5) Abbreviations have their usual meanings unless stated otherwise. Section I1.   (a) Explain the multiplexing technique used by cellular systems for mobile communications. Writë 6  the advantages and disadvantages of small cells used in cellular system.(b) Differentiate Demand assigned multiple access scheme with respect to explicit and implicit 4 reservation.(c) Explain the radiation pattern of directed antenna and sectorized antenna. 2 2.   (a) Explain with the help of diagram GSM TDMA frame and the types of handover in GSM system. 6  (b) What are the different components of DECT system architecture reference model? Draw 4  the diagram for the same.(c) Name basic applications for satellite communication and elaborate different handover 2  scenarios in satellite systems.3.   (a) Discuss classes of handover in UMTS and localization and routing with respect to Satellite 6  systems.(b) What are different inter frame spacing in medium access control layer 4   Elaborate scenario of basic DFWMAC-ICF with..several competing senders drawing the diagram.(c) What are infrastructure and àdhoc networks ? Explain them with architectural diagram of  2  IEEE 802.11.4.   (a) Discuss beacon transmission in a busy 802.11 infrastructure and adhoc network. 6  (b) Elaborate the reason that has led to the development of WATM system. 4  (c) Define formation of Blue tooth piconet and scattemet. 3  5.   (a) Explain the registration process of a mobile node through the foreign agent and directly with 6  the home agent. Also discuss IP-in-IP encapsulation process.(b) What do you understand by mobile adhoc networks and mobile TCP? 4 (c) Problems with HTTP and HTML have led to different proprietary and standardized solutions. 3  Discuss any three approaches that support wireless access. (TURN OVER  Paper 3- March’2012   Mobile Communication and simulation Con. 2466  —  SV-1032-12. 2 Section II 6.   (a)Define Simulation. State advantages of Simulation. 4  (b) A company manufactures 200 bicycles per day. Depending upon availability of raw materials 8  and other conditions, the daily production has been varying from 196 bicycles to 204 bicycles,whose probability distribution is as given below .The bicycles are transported in a specially designed three-storied lorry that can accommodate only 200 bicycles.Using the following random numbers: 82,89,78,24,52,53,61, 18,04,23,50,77,27,54,10.Simulate the process to find out : —  (i) The average number of bicycles waiting in the factory.(ii) The average number of empty spaces on the lorry. 7.   (a) Explain any four guidelines for selection of Simulation software. 4  (b) A production process manufactures computer chips on the average at 2% non-conforming. 5  Every day a random sample of size 25 is taken from the-process. If the sample containsmore than two nonconforming chips, the process will be stopped.Determine the probability that the process is stopped by the sampling scheme.(c) State and Explain the mean, variance and cdf of Uniform distribution. 3   8.   (a) Explain the following terms with respect to Queuing Systems : —   4  (i) System Capacity. (ii) Arrival Process.(b) A barber shop has two barbers. Assume that the customers arrive in a poisson fashion at 4  the rate of 5 per hour. Each barber serves customers according to an exponential distributionwith mean of 15 mins.(i) What is the probability that a customer will not have to wait for hair cut?(ii)What is the expected number of customers in the queue?(c)   Briefly explain Chi Square Test for checking the uniformity of sequence of random numbers. 5   9.   (a) Write an algorithm to generate a sample of size n from exponential distribution using 5  inverse transform technique.(b) Use the Runs Up and Runs Down Test to determine whether the hypothesis of  8  Independence can be accepted for the following set of numbers. Use a. = 0.05. [Given : the area below the Standard Normal Curve between ± 1.96 is 0.95 ]0.37 0.51 0.54 0.01 0.81 0.28 0.69 0.34 0.75 0.490.72 0.43 0.56 0.97 0.30 0.94 0.96 0.58 0.73 0.050.06 0.39 0.84 0.24 0.40 0.64 0.40 0.19 0.74 0.62Production perday  196 197 198 199 200 201 202 203 204Probability 0.05 0.09 0.12 0.14 0.20 0.15 0.11 0.08 0.06  Paper 3- March’2012   Mobile Communication and simulation 10.   (a) Discuss three steps in model building with the help of diagram. 6  (b) Explain acceptance-rejection technique. 4 (c) Write an algorithm to generate stationary AR (1) time series model. 3  
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