Any LTE Question is welcome in this thread

[qaqa]

Hello Friends

I am having a training the upcoming week with Award Solution for LTE/EPC.
I got this aucasion to ask all the guys who are working on/studying or curious about LTE to provide their most difficult questions they still confused about.
I will collect all your questions and expose it to the lecture for answer.
kindly do it as quickly as possible. tyhe training starting from this Monday to Friday.

Waiting for all your questions

I wanna give them hard time hehhe

[raednoor]

the most obvious and difficult question should be asked is :

What is LTE in the first place !!!!

good for you my friend.

BR

raednoor

[dk2000]

Hi guy,

Thank you so much for your opinion!

I have question:
- Which is the range of RSRP and SIRN? Which is the good value, acceptable value and the target for driving test?

[qaqa]

thanls,it is noted.

More questions please guys....

[edinburgh]

Ask them how to calculate the pathloss in LTE.

Normally we submit the SNR Vs. THroughout, RSRP Vs. Throughput and Pathloss Vs. Throughput in DT.

Do they have any idea on DM RS guideline and PDCCH Capacity?

And also Zadoff–Chu (ZC) sequences??

Thanks.

BR,
Edin

[s.sunilpal123]

Hello qaqa..

Thnx for ur initiative.

Pls provide the following questions from my side.

1. How does SC-FDMA reduce the PAR (Crest factor)? In almost all books, this is just stated, not explained. It will be better if a subcarrier level expalanation (with figures) can be provided for this!

2. What are the latency differences between TDD & FDD LTE and why is one less than the other? Some source for the answer will also be helpful.

3. Simplistic explanation of working of cyclic prefix...Almost all treatments are either too mathematical or too vague. Something intuitive (like a story) will be of great help!

4. For 20 MHz there are 2048 FFT. So why only 1200 Subcarriers? Why not some value nearer to 2048???

5. The formulae for Interference Margin in Downlink as well as Uplink?

6. SFR vs FFR differences and similarities pointwise?

7. Why is LTE said to have soft capacity?

8. Consider 2T2R MIMO. Consider cell I,II,III at enodeB1. The RE's for the RS of 1st antenna port in cell I are not used for the 2nd antenna port in cell I , correct? My question is can the REs used for RS in the 1st antenna port in cell I be used for RS in cell II/III or another cell I of enodeB2?

Pls provide answers if you know already! Help will be appreciated!!!!

Thanks very much!!

[s52d]

Hello!

We have nice, working W-CDMA 2.1 GHz network. Decent KPIs, so we are quite happy.
We know how to tune it (RET, changing antennas, setting pilot power etc).

One day we will get LTE frequencies. And some pocket money to buy equipment.

Question:
What are main differencies in planning LTE and 5 MHz W-CDMA/HSPA+ (beside coverage)?
If we just overlay LTE with same antenna pattern/tilt/sites as working W-CDMA:
- what is main problem for LTE? Works for W-CDMA, does not for OFDMA?
- what is very bad in W-CDMA, but works fine in LTE?
looking at pure layer1; parametrization comes later.

BR
s52d

[hexium]

Here is my question:

In Section 7.1.7.2.1 of TS 36.213 where the Table of Transport Block Sizes is given, why isn't the value for Nprb = 1 and Itbs = 6 in line with the remaining entries of this table? Is that a mistake or is this TBS used for "special" transport blocks (eg VoIP).

Thanks :-)

[qaqa]

waw guys that is grate.
lot of question means more understanding of this new technology.

Keep posting.... Bring up your most headache questions
I am starting answering your questions from next week.

cheers

[s.sunilpal123]

Thanks Qaqa...

My next question (they keep coming and coming!) :

9. In the special subframe configuration in TD-LTE, DwPTS, GP & UpPTS are present in a subframe after DL slots and then after this special subframe UL slots are present .

That is when switching from DL to UL, the above special subframe is present but when switching from UL to DL , the special subframe is not required/ present.

Why is this so?