LTE Peak Rate analysis

[wahaha]

Hi All,

Kindly find attached white paper from ALU about LTE peak rate analysis.
I think it is useful for you to understand better the calculation methodology concept about it.

Appreciate your reputation for this sharing. :)

[wahaha]

FYI, kindly share with me if you have in details LTE throughput calculation method.
Appreciate it.

LTE Throughput Calculation

From the 3gpp specification:
1 Radio Frame = 10 Sub-frame
1 Sub-frame = 2 Time-slots
1 Time-slot = 0.5 ms (i.e1 Sub-frame = 1 ms)
1 Time-slot = 7 Modulation Symbols (when normal CP length is used)
1 Modulation Symbols = 6 bits; if 64 QAM is used as modulation scheme
Radio resource is managed in LTE as resource grid…..
1 Resource Block (RB) = 12 Sub-carriers


Assume 20 MHz channel bandwidth (100 RBs), normal CP
Therefore,
number of bits in a sub-frame = 100RBs x 12 sub-carriers x 2 slots x 7 modulation symbols x 6 bits
= 100800 bits
Hence, data rate = 100800 bits / 1 ms = 100.8 Mbps


If 4x4 MIMO is used, then the peak data rate would be 4 x 100.8 Mbps = 403 Mbps.
If 3/4 coding is used to protect the data, we still get 0.75 x 403 Mbps = 302 Mbps as data rate.

[nitailor]

Hi
Should'nt we consider the overheads in calculation?


FYI, kindly share with me if you have in details LTE throughput calculation method.
Appreciate it.

LTE Throughput Calculation

From the 3gpp specification:
1 Radio Frame = 10 Sub-frame
1 Sub-frame = 2 Time-slots
1 Time-slot = 0.5 ms (i.e1 Sub-frame = 1 ms)
1 Time-slot = 7 Modulation Symbols (when normal CP length is used)
1 Modulation Symbols = 6 bits; if 64 QAM is used as modulation scheme
Radio resource is managed in LTE as resource grid…..
1 Resource Block (RB) = 12 Sub-carriers


Assume 20 MHz channel bandwidth (100 RBs), normal CP
Therefore,
number of bits in a sub-frame = 100RBs x 12 sub-carriers x 2 slots x 7 modulation symbols x 6 bits
= 100800 bits
Hence, data rate = 100800 bits / 1 ms = 100.8 Mbps


If 4x4 MIMO is used, then the peak data rate would be 4 x 100.8 Mbps = 403 Mbps.
If 3/4 coding is used to protect the data, we still get 0.75 x 403 Mbps = 302 Mbps as data rate.

[wahaha]

Hi,

Do you have in details info to share?

[lda2000]

Hi All,

These are my LTE Rel8 throughput calculations considering 5,10,15,20MHz bandwidths, 32/64QAM, RS symbols and control channels overheads.

Please thank and add rep if useful
-L

pass: 2012
27451

[wahaha]

Hi Ida2000,

Can you share the document in excel with formula available? At least we can understand better about the calculation method.

[labviewlover]

with all due respect my friend, but ur results are of NO importance without (math formulas).
please include math background too.

thanks

[lda2000]

Hi Guys,

As kindly requested, math formulas are included in this Excel version.
Please check them and report any inconsistency directly to me.

Thanks and rep very much appreciated

-L


27470
pass: 2012

[MyVi78]

If it was 10MHz bandwidth, ie. 50RBs with 2x2 MIMO; would this mean the data rate = 2 x (50400 bits / 1ms) = ~100Mbps?

1) I noticed you mentioned 6 bits if 64 QAM is used. What are the figures for other modulation schemes?
2) In your example what coding rate is being used?

[dushyantsahni]

I noticed you mentioned 6 bits if 64 QAM is used. What are the figures for other modulation schemes?
The other modulation schemes are QPSK and 16QAM for which 2 and 4 bits are considered.

[dushyantsahni]

You can also go through the link
http://frankrayal.com/2011/06/27/lte-peak-capacity/
for more explanation.

[lda2000]

Hi,

The LTE peak rates in the excel files are the maximum throughput achievable on the PHY layer assuming a non-redundant 64QAM coding scheme (6bits/symb).
On Layer 2, the specified transport block sizes defined by the 3GPP and associated to the 26 MCSs give a lower throughputs i.e.

5 MHz (25 RBs) = 18.336 Mbps
10 MHz (50 RBs) = 36.696 Mbps
15 MHz (75 RBs) = 55.056 Mbps
20 MHz (100 RBs) = 75.376 Mbps

The transport block sizes and the associated MCS must be considered during the link budget calculations.

The 3GPP specs related to these aspects are: TS 36.942, TS 36.211 and more specifically the TS 36.213

BR
-L

27611

[wahaha]

A general LTE throughput explanation from youtube:

http://www.youtube.com/watch?v=RsZyg_MIajI

[wahaha]

Does anyone has TD LTE throughput calculation method or any TD-LTE dimensioning table?