11. In Normal CP. How many resource elements(RE) present in a Resource Block(RB)?
Ans.
84 Resource Elements are present in a Resource Block.
12. Difference between RB and PRB? their length in Time-domain and Frequency-domain?
Ans.
If we talk in time domain then we know that 1 resource block have
0.5ms length, but if we talk frequency domain of 12 sub-carriers then
we gave reply of 1 PRB. The only difference is RB in time domain and
PRB in frequency domain.
13. What is the reason that OFDMA are using in downlink and SC-FDMA in uplink?
Ans.
Follow the Ques-No. 7 ans.
14. Types of Physical Channel?
Ans.
In downlink PDSCH, PBCH channels we have, Instead of these PHICH,
PCFICH, PDCCH also physical channel work only in physical layer these
channel don’t have any transport channels.
In
uplink PUSCH, PRACH channels we have, instead of these PUCCH also use
only in physical in uplink direction.
15. Describe Physical Control Channel and Shared Channel?
Ans.
Common channels means that are common for all users. in physical
layer we have some control channel like PDCCH, PCFICH, PHICH, PUCCH
Shared channels are PDSCH, PUSCH. Note* in logical channel and
transport channel have different-different common channels.
16. Describe Downlink Channel and Uplink Channel in Physical control Channel?
Ans.
PDCCH, PCFICH, PHICH in downlink & PUCCH is physical uplink
control channel.
17. Describe Downlink Channel and Uplink Channel in Physical Shared Channel?
Ans.
PDSCH in downlink & PUSCH in uplink.
18. Describe Primary Synchronization Signal(PSS) and Secondary Synchronization Signal(SSS)?
Ans.
PSS and SSS are using for synchronization with network. To read more
about PSS and SSS just clich here and read Que-08 to Que-11
Answers
19. Define which Sequence eNB used to generate PSS and SSS?
Ans.
To read this answer please click here and read Que.12 ans
20. What are the job of Reference Signal in LTE? How many Reference Signal are present in 1 Resource Block(RB)? How many types of Reference Signal are available in LTE and their Description?
Ans.
Reference signal are using for channel estimation and pci validation.
There are 4 reference signals are present in 1 RB. In rel-9 there are
4 types of reference signals are present (1. Cell specific, 2. UE
specific, 3. MBMS specifc, 4. position specific). CSI reference
signals further using in next 3GPP releases.
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