IT-602 Wireless and Mobile Computing - Jun 2025 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aWith the help of suitable diagrams explain Ground wave, sky wave and LOS propagation models of wave propagation.
   How to answer

   • Define ground wave, sky wave and LOS propagation
   • Explain mechanism and frequency range for each
   • Draw suitable diagrams for all three models
   • Give applications / limitations
2. 7 Marks
   bWhat do you mean by multiple access techniques? Discuss DAMA and PRMA techniques of Multiple access.
   How to answer

   • Define multiple access techniques
   • Explain need for multiple access in wireless
   • Discuss DAMA principle and operation
   • Discuss PRMA principle and operation
3. 7 Marks
   aWrite about architecture and working of a cellular communication system. Why is it called cellular network?
   How to answer

   • Draw architecture of cellular communication system
   • Explain components like MS, BTS, BSC, MSC
   • Explain working with frequency reuse and cell concept
   • Explain why called cellular network due to hexagonal cells
4. 7 Marks
   bDefine the terms:

   1. i)handoff
   2. ii)sectorization
   How to answer

   • Define handoff with need in mobile communication
   • Explain types of handoff briefly
   • Define sectorization with purpose
   • Explain sectorization with diagram and benefits
5. 14 Marks
   Draw and explain architecture of following communication systems. Also give a comparison of both.

   1. i)GPRS
   2. ii)GSM
   How to answer

   • Draw and explain GPRS architecture with nodes
   • Draw and explain GSM architecture with subsystems
   • Compare GPRS and GSM on switching, data rate, services
   • Conclude differences
6. 14 Marks
   Discuss following protocols of wireless networks.

   1. i)DECT
   2. ii)TETRA
   3. iii)UMTS
   How to answer

   • Explain DECT purpose, architecture and features
   • Explain TETRA purpose, architecture and features
   • Explain UMTS purpose, architecture and features
   • Highlight applications of each
7. 7 Marks
   aWhat is Bluetooth network? Write notes on physical and MAC layer of Bluetooth network.
   How to answer

   • Define Bluetooth network and piconet/scatternet
   • Explain physical layer: frequency hopping, bands
   • Explain MAC layer: master-slave, TDD, packet types
   • Give applications
8. 7 Marks
   bWrite about hidden and exposed terminal problem of wireless channel access.
   How to answer

   • Define hidden terminal problem with diagram
   • Define exposed terminal problem with diagram
   • Explain effect on wireless channel access
   • Mention solutions like RTS/CTS
9. 7 Marks
   aDiscuss physical layer and access control sub layer of HIPERLAN.
   How to answer

   • Explain HIPERLAN overview and physical layer
   • Explain channel access control sublayer
   • Describe functions like EY-NPMA, frame structure
   • Give features / applications
10. 7 Marks
    bWhat is an Ad Hoc network? Write characteristics, performance issues and applications of Ad hoc networks.
    How to answer

    • Define Ad Hoc network and infrastructure-less nature
    • List characteristics like dynamic topology, self-organization
    • Discuss performance issues: routing, security, energy
    • List applications
11. 7 Marks
    aWhat do you mean by Firewall? Write and discuss various issues of firewall designing.
    How to answer

    • Define firewall and its purpose
    • Explain types of firewalls
    • Discuss design issues like policy, packet filtering, proxy
    • Explain limitations
12. 7 Marks
    bDraw architecture of wireless sensor network and comment on its applications.
    How to answer

    • Draw architecture of wireless sensor network
    • Explain components: sensor nodes, sink, gateway
    • Explain working
    • Comment on applications
13. 14 Marks
    Write short notes on any two of the following:

    1. a)Intrusion detection system
    2. b)Snooping TCP
    3. c)IEEE 802.11a
    How to answer

    • Explain intrusion detection system: types and working
    • Explain snooping TCP: concept and operation
    • Explain IEEE 802.11a: features and physical layer
    • Conclude with applications for any two