Interview question of GSM

1) Which channel is used to transmit random access signals?
BCCH
CCCH Correct!
SDCCH
TCH
2) Which one of the following is the combination of main BCCH?
TCH+SACCH
FCH+SCH+BCH+CCCH Correct!
SDCCH/8+SACCH/8
FCH+SCH+BCH+SDCCH+SACCH
3) The Value Range of Timing Advance (TA) in GSM is?
0-31
0-127
0-63 Correct!
0-7
4) How many MS can be paged with 1 paging massage with IMSI?
1
2 Correct!
3
4
5) Directed Retry handover means?
TCH to TCH
SDCCH to TCH Correct!
SDCCH to SDCCH
None of Above
6) How many neighbors are measured by MS at a time?
5
6 Correct!
7
8
7) Time Duration of Super Frame?
3 Hour 28 minutes 53 seconds 760 ms
6.12 seconds Correct!
235.65 ms
120 ms
8) Maximum number of characters allowed in one SMS?
160 Correct!
170
180
150
9) If you have 5 MHz frequency band what will be the maximum number of channels as per
GSM system?
25 Correct!
35
20
24
10) Which kind of Handovers more desired in the Network?
Rx Level
Power Budget Correct!
Rx Quality
Interference
11) SDCCH holding time for Normal location update is
3.8ms
3.5sec Correct!
3.5ms
None of them
12) SDCCH holding time for call setup (MOC) is
2.7sec Correct!
3.5sec
2.7ms
3.5ms
13) Same BCCH-BSIC combination in adjacency will lead
Will not cause any problem.
Massive Handove failaur
Call drop
B & C Correct!
14) What is the reason of ping-pong handover
Cable swap
No dominant cell coverage
Improper handover margine
All of above Correct!
15) If there is interference on the BCCH TRx and the call is going on at the hopping Trx
Call will drop
Call will be unafected Correct!
Call will attempt handover due to this interference
None of above
16) If in a cell all KPI is going well but its TCH drop is high, there is no any RF and hardware
issue then this TCH drop will be due to
Transcoder fail Correct!
Lapd fail
A & B
None of them
17) Which system informations are used in idle mode
System information 1,2,3,4,7 & 8 Correct!
System information 1,2,3,4,5,6,7 & 8
System information 1,2,3,4,5,6,9 & 10
System information 1,2,3,4,5,6,7,8,9,10,11,12 & 13
18) Which system informations are used for BA list
System information 1,2,3 & 4 Correct!
System information 5,6,8,9,10 & 12
System information 12 & 13
None of them
19) Which system informations are used for MA list
System information 13,10,9 & 4
System information 5 & 6 Correct!
System information 12 & 13
None of them
20) Which system informations are used for GPRS
System information 9 & 4
System information 5 & 6
System information 12 & 13 Correct!
None of them