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Mobile Computing − Decmber 2005 Time : 3 Hrs.] [Marks : 100 N.B. (1) Attempt any five questions. (2) Figures to the right indicate marks (3) Assume suitable data if required. 1. (a) A computer Engineering department plans to set up a mobile communication laboratory. Identify the
requirements for such laboratory. Explain various components involved. Show the set up diagrammatically. (Assume suitable specifications of the components.) [10]
(b) Explain a typical call flow sequence in GSM addressed to following features [10] (i) Mobile call origination. (ii) Mobile call termination. 2. (a) How much of the original GSM network does GPRS need ? Which elements of the network perform data
transfer ? [10] (b) Draw and explain frame structure of UTRA − FDD (W−CDMA). [10] 3. (a) Differentiate the Iridium and Globalstar systems with respect to Bit rate, indination access method, lifespan
and cost etc. [8] (b) Explain with suitable waveforms BFSK without abrupt phase changes, which belong to CPM scheme. [12] 4. (a) Explain IEEE 802.11 MAC packet structure. Also explain various fields in the frame control of MAC. [10] (b) With suitable diagram describe how high bandwidth internet access is achieved using DVB. [10] 5. (a) Explain ‘Bluetooth protocol stack’ with neat diagram. [10] (b) Explain need for wireless communication with its special applications. [6] (c) Explain w.r.t. Satellite Systems. [4] (i) Indination angle. (ii) Elevation angle. 6. (a) Explain cellular system in detail with various handover mechanisms. [10] (b) If a total of 33 MHz of bandwidth is allocated to a particular FDD cellular telephone system which uses
two 25KHz simplex channels to provide full duplex voice and control channels. [10] (i) Compute the number of channels available per cell if a system uses four cell reuse. [6] (ii) If 1MHz of allocated spectrum is dedicated to control channels, determine an equitable distribution of
control channels and voice channels in each cell. [4] 7. Write short notes on [20] (a) IPV6 in Mobile Communication. (b) GSM. (c) DSDV
Mobile Computing − May 2006 Time : 3 Hrs.] [Marks : 100 N.B. (1) Question No. 1 is compulsory.
(2) Attempt any four questions out of remaining six questions. (2) Marks to the right indicate full marks (3) Make suitable assumptions wherever necessary and clearly justify them. 1. (a) Why is routing in multi−hop ad−hoc networks complicated? Discuss some of the routing protocols &
strategies for ad−hoc mobile wireless networks? [10] (b) How can DHCP be used for mobility and support of mobile IP? [5] (c) Explain hidden & exposed terminals problem. How MACA avoids these problems. [5] 2. (a) Compare Iridium, Globalstar, ICO, Teledesic. [10] (b) Draw the block diagram of FHSS transmitter and receiver. [10] Differentiate between slow frequency hopping and fast frequency hopping. 3. (a) Explain Digital Audio Broadcasting (DAB). [10] (b) Compare IEEE 802.11, HiperLAN and Bluetooth with regard to their ad−hoc capabilities. Where is the focus of these technologies? [10] 4. (a) Explain cellular system in detail with various handover mechanisms. [10] (b) How and why does I−TCP isolate problems on the wireless link? What are the pros and cons of this
solution. [10] 5. (a) Explain space, time, frequency and code multiplexing in wireless communication. [10] (b) Explain power management in IEEE 802.11 infrastructure networks and ad−hoc networks. [10] 6. (a) Explain DECT system architecture reference model & protocol architecture. [10] (b) What are the general problems of satellite signals traveling from a satellite to a receiver. [5]
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7. (a) Write short notes on : (Any two) [14] (i) GSM architecture (ii) Mobile and wireless devices (iii) CDMA (iv) WTA logical architecture (b) What are requirements for converting a computer wired LAN based laboratory into a typical wireless
laboratory. Analyze the requirements, regarding software & hardware. [6]
Mobile Computing − November 2006 Time : 3 Hrs.] [Marks : 100 N.B. (1) Attempt any five questions. (2) Marks to the right indicate full marks (3) Make suitable assumptions wherever necessary and clearly justify them. 1. (a) Explain ‘Bluetooth protocol stack’ with the neat diagram. [10] (b) Compare UMTS, DVB, DAB with at least five points. [5] (c) How does IEEE 802.11, solve the hidden terminal problem. [5] 2. (a) What are the main benefits of a spread spectrum system ? [10]
How can spreading be achieved ? How can DSSS systems benefit from multi−path propagation ? (b) Explain functional architecture of GSM system. [10] 3. (a) What advantages does the use of IPv6 offer for mobility ? [6] (b) Explain snooping TCP with its advantages and disadvantages. [10] (c) Explain w.r.t. Satellite systems : [4] (i) Inclination angle (ii) Elevation angle. 4. (a) Discuss about components and interface of WAP 1.x architecture. [6] (b) What are the functions of authentication and encryption in GSM ? [10] How is system security maintained. (c) Explain the entities in brief : [4] (i) Foreign agent (iii) Home agent (ii) Care− of address (iv) Mobile node. 5. (a) Explain how tunneling works for mobile IP using IP−in−IP, Minimal, and generic routing encapsulation,
respectively. Discuss advantages and disadvantage of these three methods. [12] (b) What characteristics do the different orbits have ? What are their pros and cons. [8] 6. (a) What are different tasks, a MAC layer handles in 802.11 ? Explain 12 different Basic access mechanisms
defined for IEEE 802.11 in detail. [12] (b) Why is routing in multi−hop ad−hoc networks complicated ? what are the special challenges ? [8] 7. Write short note on : (any two) [20] (a) Mobile agents (b) CDMA (c) Comparison of FDMA/TDMA/SDMA (d) Mobile and wireless devices (e) Wireless markup language and WML Script.
Mobile Computing − May 2007 Time : 3 Hrs.] [Marks : 100 N.B. : (1) Question No. 1 is compulsory (2) Attempt any four out of remaining six questions. (3) All questions carry equal marks. 1. (a) Explain the various wideband modulation techniques employed in cellular/mobile technologies. [10] (b) Discuss various types of Handover and explain their management. [10] 2. (a) Explain ‘Bluetooth protocol Stack’ with neat diagram- [10] (b) Explain how high bandwidth internet access is achieved using DVB. [10] 3. (a) Discuss MAC protocol for IEEE .802.11. [10] (b) Write detailed noted on indirect TCP(I−TCP)− including its merits and demerits over snooping TCP and
mobile TCP. [10] 4. (a) Discuss some of the routing protocol and strategies suitable for ad-hoc mobile wireless network. [10] (b) Compare Iridium, Globalstar, ICO and Teledesic. [10]
University Question Papers
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5. (a) Draw block diagram of FHSS transmitter and receiver. Differentiate between slow frequency and fast frequency hopping. [10]
(b) Elaborate on security handing in wireless/mobile network. [10] 6. (a) What do you understand QoS in mobile network? Explain the parameter which determines QoS. [10] (b) Explain DECT system architecture reference model and protocol architecture. [10] 7. Write short Notes on (any two) : [20] (a) GSM (b) IPv6 in mobile communication (c) Architecture and protocol supported by WAP (d) CDMA.
Mobile Computing − December 2007 Time : 3 Hrs.] [Marks : 100 N.B. : (1) Question No. 1 is compulsory.
(2) Attempt any four questions out of remaining six questions. (3) Make suitable assumptions wherever necessary and clearly justify them.
1. (a) What advantages does the use of IPv6 offer mobility? [6] (b) Explain packet flow if two mobile node communicate ? [6] (c) What do you understand by QoS in Mobile network? Explain the parameters which determine the QoS? [8] 2. (a) Explain Space, Time, Frequency and Code multiplexing in Wireless network? [10] (b) What are reasons for delay in GSM system for packet data traffic? Draw and Explain the protocol architectures of GSM? [10] 3. (a) Explain the various wideband modulation techniques employed in cellular/mobile technologies? [10] (b) Explain WATM reference model with several access scenarios. [10] 4. (a) Discuss different types orbits with their characteristics, application, pros & cons. [10] (b) Explain IEEE802.11 MAC packet structure. Also explain various filed in frame control of MAC? [10] 5. (a) Compare Digital Audio Brodcasting with Digital Video Brodcasting? [10] (b) Explain various handover mechanisms in Cellular System. [10] 6. (a) Explain the error in wireless network, which degrade TCP performance and how TCP snooping can
improve this situation ? [10] (b) Explain how tunneling work for mobile IP using IP-in-IP, minimal & generic routing encapsulation
respectively. Discuss pros & cons of these three methods. [10] 7. Write Short notes on (any two):- [20] (a) WML (b) CDMA (c) UMTS.
Mobile Computing − May 2008 Time : 3 Hrs.] [Marks : 100 N.B. : (1) Attempt any five questions. (2) Marks to the right indicate full marks. (3) Make suitable assumptions wherever necessary and clearly justify them. 1. Differentiate between the following : (At least four points) (any two) : (a) Infrastructure and Adhoc networks [4] (b) IPv4. and IPv6 [4] (c) FHSS and DSSS [4] (d) IEEE 802.11 a and IEEE 802.11b [4] (e) Infra red and radio transmission [4] (f) FDMA and TDMA [4] (g) Indirect TCP and Snooping TCP [4] (h) CDMA and GSM. [4] 2. (a) Discuss about components and interface of WAP 1.x architecture. [6] (b) Draw the block diagram of FHSS transmitter and receiver. [10] Differentiate between slow frequency hopping and fast frequency hopping. (c) Explain the entities in brief : [4] (i) Home agent (iii) Foreign agent (ii) Mobile node (iv) Care−of address.
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3. (a) What are the functions of authentication and encryption in GSM ? [10] How is system security maintained ? (b) Explain ‘Bluetooth protocol stack’ with neat diagram. [10] 4. (a) What characteristics do the different orbits have ? What are their pros and cons ? [8] (b) Explain how tunneling works for mobile IP using IP−in−IP, Minimal, and generic routing encapsulation,
respectively. Discuss advantages and disadvantages of these three methods. [12] 5. (a) How can DHCP be used for mobility and support of mobile IP ? [5] (b) Explain cellular system in detail with various handover mechanisms. [10] (c) Explain hidden and exposed terminals problem. How MACA avoids these problems ? [5] 6. Write a short notes on : (any two) [20] (a) GSM architecture (b) Routing protocols in Ad−hoc networks (c) Mobile and wireless devices. (d) Power management in IEEE 802.11 infrastructure networks. 7. (a) What are the benefits of reservation scheme ? How collisions are avoided during data transmission ?
Explain DAMA scheme. [8] (b) Two senders, A and B, want to send data. CDMA assigns the following unique and orthogonal key
sequences : key Ak = 010011 for sender A, key Bk = 110101 for sender B. Sender A wants to send the bit Ad = 1, sender B sends Bd = 0.
Let us assume that we code a binary 0 as −1, a binary 1 as +1, Show calculations, how spreading be achieved ? What can the receiver detect for sender A and B respectively ? [12]
Mobile Computing − November 2008
Time : 3 Hrs.] [Marks : 100 N.B. : (1) Question No. 1 is compulsory.
(2) Attempt any four questions out of remaining six questions. (3) Assume suitable data if required.
1. (a) A Computer Engineering Department plans to design and set up a Mobile Communication Laboratory. Identify the software, hardware and networking requirements for such laboratory. Explain various components involved. Show the set up diagrammatically. (Assume suitable specifications of the components). [10]
(b) “In wireless communication, multiplexing can be carried out in four dimensions i.e. space, time, frequency and code”. Explain. [10]
2. (a) What is the principle of frequency reuse in the context of a cellular network? [8] (b) What are the reasons for delay in GSM system for packet data traffic ? Draw and explain the protocol
architecture of GSM. [12]
3. (a) What are the advantages and disadvantages of using CDMA for a cellular network ? [10] (b) Explain the various wideband modulation techniques employed in cellular/mobile technologies. [10]
4. (a) Explain the difference between a single−cell and a multiple−cell wireless LAN. [10] (b) Explain ‘Bluetooth protocol stack’ with neat diagram. [10]
5. (a) Explain and draw IEEE 802.11 protocol architecture. [10] (b) Explain the errors in a wireless network, which degrade TCP performance. Briefly explain how TCP
snooping can improve this situation. [10]
6. (a) Explain the difference between TDMA, FDMA and CDMA with suitable example. [10] (b) Explain and draw the architecture of GPRS system. [10]
7. Write short notes on (any four) : [20] (a) DECT (b) PACS Personel Access Communication (System) (c) Mobile IP (d) WML and its Applications (e) Wires Vs Wireless Local Loop (f) Mobile Agents.
University Question Papers
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Mobile Computing − May 2009 Time : 3 Hrs.] [Marks : 100 N.B. : (1) Attempt any five questions out of given seven questions..
(2) Assume suitable data wherever required. 1. (a) With neat diagram, explain ‘Bluetooth Protocol Stack.’. [10] (b) Explain what is spread spectrum ? How spreading can be achieved? What are the merits of spread
spectrum technique ? [10]
2. (a) Differentiate between :-
(i) FDMA and TDMA (ii) CDMA and GSM
[10]
(b) Describe various modulation techniques used in mobile communication. [10] 3. (a) Explain different methods to increase the capacity of GSM mobile system. [10] (b) What is 'near far problem' in CDMA system ? [5] (c) What do you mean by frequency reuse concept ? [5] 4. (a) Draw the architecture of GSM mobile system and explain each block. [10] (b) Explain in detail IEEE 802.11 protocol architecture. [10] 5. (a) What are the advantages of reservation scheme ? How collisions are avoided during data
transmission ? [10]
(b) Explain various handover techniques in mobile system. [10] 6. (a) Compare Digital Audio Broadcasting with Digital Video Broadcasting. [10] (b) Explain GPRS architectural reference model and show the protocol architecture of the transmission
plane for GPRS. [10]
7. Write a short notes on (any two): [20] (a) WML (b) DECT (c) Routing Protocols in Ad-hoc Networks (d) WATM Networks.