Important Question for GTU Exam
Define the following terms regarding wireless communication
(1) Control channel
(2) Half duplex channel
(3) Base station
(4) Mobile Switching Center
(5) Simplex systems
(6) Full duplex systems
(7) Reverse channel
(8) Dwell time
(9) Frequency Reuse
1. What
is Cellular network? Explain frequency allocation in GSM network.
2. Explain
GSM architecture and role of its components. OR Draw and explain GSM
architecture
3. Explain
Call routing in GSM.
4. Explain
: Handover , Authentication and Security in GSM or What is hand over in GSM? Give comparison of
hard hand over and soft hand over
5. Describe
various GSM logical and physical channels
6. With
the help of timing parameters, explain frame structure for GSM
7. How
does GSM radio subsystem work?
8. Explain GSM network’s hexagonal cellular
concept and frequency reuse concept
9. Explain
in detail the signal processing in GSM including speech coding ,channel
10. Compare
: CDMA and GSM
11. Explain
: Spread Spectrum
12. Explain
: Indirect TCP and Mobile TCP
13. Explain
in detail Direct Sequence Spread Spectrum (DSSS). Explain how it works in the
CDMA technology? OR What is DSSS? Explain CDMA chip sequence with example.
14. What
is Walsh function? Explain it for CDMA orthogonal codes.
15. What
is the frequency range of uplink and downlink in GSM network?
16. (II)
What are the four possible handover scenarios in GSM? (III) What is Multipath
propagation? What is dwell time?
17. How
is Mobility Management done in GSM? List the various handovers carried out in
GSM and explain any one of them in detail.
(I)
What are Advantages and Disadvantages of
Infrared?
(II)
Why is conventional routing in wired networks
not suitable for wireless networks? Substantiate your answers with suitable
examples.
18. what
are the essential functional differences between 1st generation, 2nd generation
and 3rd generation of networks?
19. List
and explain GSM entities
20. What
are the advantages of mobile applications? How existing application can be made
mobile enabled? Explain.
21. Compare
CDMA and GSM
22. Explain
routing between PLMNs for GSM system.
23. What
is spread spectrum technology? Compare it with narrow band.
24. Explain
BSS, Handover in GSM OR Explain the handover procedure in GSM system.
25. Briefly
describe the following networks with example and application 1. Wired network
2. Wireless network 3. Ad hoc network
26. Describe
different GSM addresses and identifiers
27. What
is handover/handoff? How handoff is different from roaming?
28. Explain
how mobile transport layer is different from TCP/IP transport layer
29. Explain
different types of Propagation Mode. OR Enumerate various radio propagation
model and explain any two of them
30. What
is an ISM band? “It is a free band” Justify.
31. (b) In a CDMA network, assume there are four stations A, B, C, and D with their chip sequences, shown in Fig. 1. Fig. 2 shows foyr cases of four stations transmitting at the same time. Show the transmitted sequences S1 to S4 and how DSSS does the recovery at receiver.
32. Write Note on Signaling Protocol Structure in GSM
33. Explain
following :
i.
Draw: Cellular Structure. [Marks : 1]
ii.
Justify: Cell shape is Hexagon. [Marks : 2
]
iii.
How to reuse the limited frequency band in
cellular architecture
[Explain Diagrammatically. Make
following assumption: Frequency Band : 100-170 Cluster Size:7
34. What
is CDMA? Explain the orthogonal codes for it.
35. What
is frequency hopping in spread spectrum? Explain TDMA in detail
36. Explain
the functionality of HLR and VLR in call routing.
37. Differentiate
between guided media and unguided media.
38. What
are the major advantages and disadvantages of microwave transmission?
39. How
is interference avoided by using frequency division multiplexing?
40. Explain
the difference between datagram and virtual circuit operations.
41. What
are the limitations of using a circuit switching network for data transmission?
42. What
tasks are performed by the transport layer?
43. What
is a protocol data unit(PDU)? What is TCP/IP?
44. List
five ways of increasing the capacity if a cellular system.
45. List
and briefly define different performance metrics that may be used to make the
handoff decision.
46. Explain
the difference between open-loop and closed-loop power control.
47. What
are the advantages and disadvantages of using CDMA for a cellular network?
48. Explain
the difference between hard and soft handoff.
49. Explain
the paging function of a cellular system
50. Explain
the types of antennas.
51. What
is the primary cause of signal loss in satellite communications?
52. Name
and briefly define four types of noise.
53. Define
refraction, diffraction, fading, reflection & scattering.
54. What
is the difference between diffraction and scattering?
55. What
is the difference between flat and selective fading?
56. Explain
Doppler effect with an example.
57. What
is the difference between QPSK and offset QPSK?
58. What
is QAM? Briefly explain it
59. What
are the differences among angle modulation, PM and FM?
60. What
is the relationship between bandwidth of a signal before and after it has been
encoded using spread spectrum?
61. List
three benefits of spread spectrum.
62. Explain
the difference between slow FHSS and fast FHSS.
63. Explain
the difference between autocorrelation and cross correlation.
64. Explain
the modulation techniques for converting digital data to analog signal.
65. Explain
the modulation techniques for converting analog data to digital signal.
66. Explain
the antenna design systems for mobile networks
67. With
respect to mobile networks, explain co channel and adjacent channel
interference
68. Enumerate
various radio propagation model and them any two of them
69. Describe
empirical formula for path loss in mobile networks
70. What
is fading? List and explain various types of small scale fading
71. Describe
RAKE receiver in CDMA
72. With
figure explain hand off scenario at cell boundary
73. Explain
the concept of Cell splitting in detail with figure
74. Explain
the concept of sectoring in detail with figure.
75. With
necessary equations explain Free space propagation model in detail.
76. With
figure explain Knife-edge diffraction model in detail. Write the Equation for diffraction gain
77. Explain
coherence time and coherence bandwidth
78. Explain
IS-95 CDMA System
79. Compare
TDMA,FDMA and CDMA Technology for cellular systems
80. Explain
in details the third generation(3G) wireless networks standards:- 1) 3G
W-CDMA (UMTS) 2) 3G cdma2000 3) 3G TD
- SCDMA
81. Explain
the difference between cell splitting and sectoring. Prove that the
cochannel reuse ratio is given by
where N = i2 + ij + j2 (Use cosine law &
hexagonal geometry)
82. What
is soft handoff? Explain in detail RAKE receiver with neat diagram
83. Explain
in detail the CDMA forward channel operation
84. What
is DVM? Explain it. How it is differ from JVM?
85. Explain
Different Layouts available in Android. Explain with Example
86. Explain
GUI Architecture of Android
What is requirement of Kernel layer in Android architecture?
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