Q11. Name of the interface present in MME to MME, and protocol name?
Ans. S10 is the
interface name between MME to MME, and protocol name is GTPC.
Q12. What is the name of Protocol using in P-GW to OCS and OFCS?
Ans. The name of
protocol using between PGW to OCS and OFCS is Diameter.
Q13. How many famous LTE technique? And how many types of bandwidth use in LTE?
Ans. There are two
types of techniques in LTE which are FDD and TDD. 6 types of BW used (1.4,3,5,10,15,20)Mhz.
Q14. What is Resource Block (RB) in lte?
Ans. Resource Block is
the smallest unit of Radio Resources allocated to user, it is 180Khz in freq
Domain and 0.5ms in time domain. 1 Resource block is equivalent to 1 Time Slot.
One resource block carry 12 subcarrier and each subcarrier BW in 15Khz. It also
carry OFDMA symbol which is categorized in normal (7 OFDMA symbols) and
extended(6 OFDMA symbols) cyclic prefix.
Q15. How many events are in LTE ?
Ans. There are 7 Events
in LTE:
A1:-Serving
become better than threshold.
A2:Serving
become worst then threshold.
A3:
Neighbour become offset better than serving.
A4:Neighbour
becomes better than threshold.
A5;
Serving become worse than threshold 1 and neighbour become better than
threshold 2.
B1:
Inter RAT neighbour become better than threshold.
B2;
Serving become worse than threshold 1 and inter RAT neighbour become better
than threshold 2.
Q16. How many System Information Blocks (SIBs) are present in LTE?
Ans. There are 14 types
of SIB in LTE in Release 9
|
Cell access related parameters, scheduling of
other SIBs contained PLMN information’s
|
|
|
It contained Common and shared channel
configuration, RACH related configuration are also present
|
|
|
It contained Parameters required for
intra-frequency, inter-frequency and I-RAT cell re-selections
|
|
|
Contained Information regarding INTRA-frequency neighbouring
cells (E-UTRA)
|
|
|
Contained Information regarding INTER-frequency neighbouring
cells (E-UTRA)
|
|
|
Contained Information
for re-selection to INTER-RAT (UTRAN cells)
|
|
|
Contained Information
for re-selection to INTER-RAT (GERAN cells)
|
|
|
SIB-8
|
Contained Information
for re-selection to INTER-RAT (CDMA2000)
|
|
Contained Information related to Home
eNodeB (FEMTOCELL)
|
|
|
Contained ETWS (Earthquake and Tsunami Warning
System) information (Primary notification)
|
|
|
Contained ETWS (Earthquake and Tsunami Warning System)
information (Secondary notification)
|
|
|
Contained Commercial Mobile Alert Service (CMAS)
information.
|
|
|
SIB-19
|
It is used for get back in 4G from 3g after
giving priority to 4g.
|
Q17. What kind of information SIBs carry?
Ans. Mainly Sibs
carried systems information for more details refer to answer 16.
Q18. What is MIB? Is MIB also a part of System Information? If yes then what kind or information it carrying?
Ans. MIB full form is
Master Information Block, yes it is a part of System Information. Basically its
carry 3 types of information:
(i)
Bandwidth
detail.
(ii)
PHICH
Detail
(iii)
System
Frame Number.
MIB
is present in every Radio frame and every 40 ms new MIBs and same MIB repeated
for 10 ms.
Q19. What is OFDM symbol? How many symbol present in a subframe in Normal & Extended?
Ans. OFDM
is a orthogonal freq division multiple access, Its a scheme or method for
digital multi subcarrier using many closely spaced subcarrier-previously
modulated signal modulated into another signal of higher freq and bandwidth.
Each of the subcarrier contains number of parallel data stream grp bits of data
related to gross bit rate, which is expressed in bites/second. Sub-frame that
tightly packed to help make efficient use of spectrum. 1 OFDMA symbol sampling
rate is 2048 and 66.7usec in sampling time.
Uses
and Benefits:
(i)
Avoid
multipath fading issue and using in DL.
(ii)
Reduced
impact of delay spread.
Drawbacks:
(i)
Relatively
high peak to average power ratio(PAPR)(Its means power amplifier have to
operate with increased back off that reduced efficiency).
Classified
in two cyclic prefix categories:
(i)
Normal
Cyclic prefix: It carry 7 OFDMA symbol at a time in which 1symbol prefix
sampling rate is 160 and time is 5.2us, remaining 6 symbol prefix sampling rate
in 144 and 4.7us.
(ii)
Extended
Cyclic prefix : It carry 6 OFDMA symbol at a time and all symbol prefix
sampling rate in 512 and 16.7us sampling time.9
Q20. How many Channels are used in LTE system?
Ans. There are 3
channels used in LTE(i) Physical (ii)Logical (iii) Transport channels.
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