GSM Interview Question

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Offline hasanmahmud

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GSM Interview Question
« on: March 29, 2014, 04:14:59 PM »
1. What are the three services offered by GSM? Explain each of them briefly.
2. Which uplink/downlink spectrum is allocated to GSM-900?
3. Which uplink/downlink spectrum is allocated to DCS-1800?
4. How many carrier frequencies are there in GSM-900/DCS-1800? How much is the separation between the carrier frequencies?
5. What is Ciphering? Why do we need it? Name the algorithm(s) used in it?
6. What is Authentication? Why do we need it? Name the algorithm(s) used in it?
7. What is equalization? Why do we need it?
8. What is interleaving? Why do we need it?
9. Explain Speech Coding?
10. What is channel coding?
11. What do you mean by Frequency re-use?
12. What is Cell Splitting?
14. Name the interfaces between a) BTS and MS b) BTS and BSC c) BSS and MSC?
15. What are LAPD and LAPDm?
16. What is WPS?
17. What is MA?
18. What is MAIO? Mobile Allocation
19. What is the difference between Synthesized Frequency Hopping and Base Band Frequency Hopping?
20. What is Cycling Frequency Hopping?
21. What is HSN? How do we apply it?
22. What is DTX? Why is it used?
23. What is DRX? Why do we need it?
24. What is the gross data rate of GSM?
25. What is Erlangs? What is meant by GoS?
26. We use two different bands for GSM/DCS communications; GSM900 and DCS-1800. Which one is the better of the two in terms of coverage?
27. What is TA? Why do we need TA?
28. What is meant by Location Area?
29. What is location update? Why do we need location update?
30. What is meant by IMSI, TMSI, IMEI and MS-ISDN? Why they are needed?
31. What is ARFCN?
32. Explain Power Control?
34. What is an extended cell? How does it impact the system? Channels and TDMA structure?
35. Why do we use Multiple Access Schemes? What is the difference between FDMA, TDMA and CDMA?
36. Which channel(s) is used for SMS?
37. Which channel is used by MS to request access to the network?
38. What is AGCH?
39. Why do we need SDCCH?
40. What is a physical channel? How do we differentiate between physical and logical channels?
41. What are TDMA frames, multiframes, superframes and hyperframes?
42. Why do we need FCCH, SCH and BCCH?
43. Why do we need SACCH?
44. What is the purpose of PCH and CBCH?
45. Do we keep BCCH on a hopping radio? Give the reason to support your answer.
46. How much delay is present between downlink and uplink frames? Why do we need this delay?
47. Explain the structure of a Traffic Multiframe. Why do we need SACCH and Idle bursts in a traffic multiframe?
48. How is a FACCH formed? When is a FACCH used?
49. What are bursts? Explain various types of bursts, Radio Propagation and Antennas?
50. What is VSWR? Why do we need it?
51. What do you mean by EIRP?
52. What is Polarization? What are the types of polarization?
53. What is fading?
54. What is Rayleigh Fading?
55. What is multipath fading?
56. How can we minimize multipath fading?
57. What are the different types of diversity?
58. Explain various types of Antenna Diversity?
59. Explain Frequency Diversity.
60. Explain Time Diversity.
S M Hasan Mahmud
BSc and Msc in Software Engineering
Lecturer, SWE, Daffodil International University, Bangladesh

Offline mhasan

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Re: GSM Interview Question
« Reply #1 on: June 09, 2014, 12:42:30 AM »
Thanks for your good post.
MM Hasan
Sr. Lecturer
Department of CSE
Daffodil International University
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