cm e2 e3 question bank - baixardoc

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E2-E3 CONSUMER MOBILITY CORE PAPER QUESTION BANK

1. GSM working on three bands are

900 MHz

1800 MHz

1900 MHz PCS USA

2. Uplink frequency

890 – 915 MHz

Down frequency

935 - 960 MHz

3.Mulitiple access techniques used in GSM are

FDMA

TDMA

4. Data Frequency Used in GSM

25 MHz

5.Total Carriers Used in GSM

125 Carriers


6.Each Carrier Frequency in GSM

200KHz

7.Each Carrier data rate

270.8 Kbps

9.Modulation used in GSM

GMSK (Gaussian Mean Shift Key)

10. Out of 125 carrier only one carrier called ARFCN and it is not used. Rest of

the carriers are used .

11. 124 Carriers are divided to 4 GSM operators 124/4 = 31 carriers per GSM

operator.

12.Bursting is the periodical switching.

13. GSM using same set of frequency between 2 cell areas.

14. Any mobile phone served by a cell area called mobile phone.

15. Cell pattern is a Group of cells

16.Cell pattern used in GSM

4 cell pattern

7 cell pattern

12 cell pattern

17. BSNL follows 7 cell pattern.

18. Group of cell is called cluster.


19.We must maintain co channel distance.

20.Carrier separation frequency 0.2MHz

21. PLMN - Public land mobile net work.

22. Inter faces used in GSM architecture

MS – BTS Um Universal media inter face or Air interface

BTS – BSC A bis

BSC – MSC A

MSC – VLR B

MSC – HLR C

HLR – VLR D

VLR– AUC F

MSC – PSTN ISDN, SMSC, GMSC, MMSC, VMSC

are E interface.

23. Functions of a ME are

1.Digitizing

2.Encoding

3.Encrypting

4.Decrypting

5.Error protection ,Error diction & error correction

6.Modulating


7. Handle 6 BTSs simultaneously & process nearest

BTS.

8. Handle messages

9. Location updation

10. Analysis the dedicated channel

24. A Mobile set has Mobile Equip & SIM

ME has IMEI no.

SIM has IMSI no.

IMEI has 15 Digit No.

IMSI has 15 Digit No with 3 MCC 2 MNC 10 MSISDN

404 37 9444024365

25.Sim has a flash memory with 16 KB or 32 KB

26. SIM have 2 Security code PIN and PUCK

27. Functions of a BTS.

H/F TX

I/P Filter H/F RX

O/P Filter Slow

Freq.

Signal

Proces

sing

TX

Sys. I/P Filter

O O


28.SFH Slow frequency hopping is the 217 hops/sec changing of the frequency

of XN.

30.Functions of BTS?

1.Preform TransReceive functions.

2.Encrypting & decrypting with BSC

3. Transceivers allow several frequencies and different sectors.

4.Interface with BSC by BSF (base station control function o&m)

5.Manages operation status of TX. Software handling and alarm

collection.

6.Modulate Layer 1 Um for GMSK or 8PSK

31.BSC functions.

1.BSC contain allocation of Radio channels

2.Receives measurements from MS

3.BTS to BTS Hand over

4.It acts as a concentrator Between BTS to MSC ie low capacity

connection 16Kbps to smaller no of connection 64 Kbps High level utilization .

5. Acts as a performance measuring centre.

32. BSC database contains

1.Information of all sites

2.RRM radio resource management

3.Frequency hopping list.

4.Receiving level for call border calculation.


33.Trans coder Unit coverts the voice channel coding between GSM {RPE-LTP

13kbps ) to CCITT Standard 64 kbps voice into 20ms Blocks.

34. The Interface between MS and BTS is A

False, It is Um interface.

35. One hyper frame contains 51 Super frames.

False , 2048

36.TMSI for a MS is allotted by EIR.

False, It is done by VLR.

37.MRSN for a MS is allotted by the MSC/VLR.

True

38.RACH is used only in the down link direction.

False , it is used in the Uplink direction.

39.The logical channel used for radio link supervision measurements FACCH

False, the correct answer is SACCH

40.The logical channel that carries the Cell Identity and Location area identity is

SACCH.

False , it is BCCH


41.GSM is the Third generation system.

False, Second generation.

42. Transmitting in Discontinuous Transmission mode (DTX) saves timeslots in the

Um interface.[ F, does not save]

43.An action taken by MSC/VLR to set the subscriber status present is called TMSI

Detach Procedure. [False, IMSI attach]

44.All the cells in a location area are served by different VLR

[False, Same VLR]

45. TMSI can be coded in 4 octets [True]

46.EDGE is an IMT 2000 Technology. [ False, WCDMA]

47.GPRS utilizes single time slot for achieving higher data speed

[False, Multiple]

48.EDGE is using QPSK modulation [False, 8 PSK]

49. Mobile switching center having connectivity to external networks like PSTN

/ISDN/PSPDN is called Gateway MSC [True]

50.SIM Card is loaded with TMSI at the time of service provisioning

[False ,IMSI]


51.The equalizer is provided to get the reliable binary signal detection. [TRUE]

52.HLR, VLR, EIR and AuC are the data bases connected with MSC

[TRUE]

53.GSM provide frequency hopping capability on the radio interface to reduce

the effects of multi path fading

[TRUE]

54.GSM is an analog system.

[FALSE , Digital]

55.A base station gives communication coverage for a limited number of mobile

subscribers within a cluster.

[FALSE, CELL]

56.RF band allotted for GSM 900MHz for uplink is 890 – 915MHz [TRUE]

57.Higher value of Q= D/R increases co-channel interference.

[FALSE, Decreases]

58.For duplex operation, two radio channels must be allotted to each mobile

station. [TRUE]


59.Traffic handling capacity of the cellular system is large if cluster size is small.

[TRUE]

60.A three sectored cell has better C/I value compared to a omni cell [TRUE]

61.For a given grade of services busy hour Erlang capacity improves with increase

in the number of access channels.[TRUE]

62.Cells in city area have larger diameter compared with that in sub-urban areas.

[FALSE, SMALL]

63.In GSM, RF carriers used with in a sector should not be adjacent carriers.

[TRUE]

64.Due to Limited RF resource the concept of Frequency reuse is employed.

[TRUE]

65.Startup cell is having smaller radius

[TRUE]

66. The cell pattern used in GSM is 4/12 [TRUE]

67. The concept of sectorisation will Reduce Interference [TRUE]

68. The HLR consists of a permanent database. [TRUE]

69. Modulation Technique used in GSM


a) QPSK b) QAM c) GMSK d) BPSK

70. The Speech Coding used in GSM

a) Parameter Coding b) RPE-LTP coding c) Wave shape Coding

71. The logical channel that is used for subscriber authentication

a) SACCH b) FACCH c) SDCCH d) AGCH

72. The Channel bandwidth in GSM

a) 25 KHz b) 100 KHz c) 200KHz d) 250 KHz

73. The Interface between BSC and MSC

a) A b) C c) E d) Um

74. The bit rate at the output of MS is

a) 270Kbps b) 22.8Kbps c) 13 Kbps d) 2Mbps

75. The duration of one Burst period is

a) 3.9 µs b) 4.615 ms c) 0.577 ms d) 120ms

76. The Logical channel that is used for handover commands

a) SACCH b) FACCH c) SDCCH d) AGCH

77.The logical channel which steals a time slot of a TCH

a) SACCH b) FACCH c) AGCH d) RACH

78.The Ciphering Key Generation Algorithm is

a) A3 b) A8 c) A5

cm e2 e3 question bank - baixardoc

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