Spectrum Efficiency

[mounir34]

Dear Freinds
please i need doc or guidline ,how to calculate spectrum efficiency For 3G and LTE (Huawei vendor prefered)

Thanks

[Nyquist]

Hi mounir34.
Maybe I don't understand your question.
Spectrum Efficiency is inherent in the technologies and shows how many bits can be transmitted per Hz (bps/Hz).
For instance (got from internet), following are the spectrum efficiency for some technologies.

40879

Hope it helps
Nyquist

[Stantheman]

Take a look at this Wiki, it might help you https://en.wikipedia.org/wiki/Spectral_efficiency

Interesting to note the research going into Massive MIMO http://www.microwavejournal.com/articles/28974-from-mimo-to-massive-mimo "spectral efficiency of nearly 80 bits/s/Hz"

[mounir34]

dears
i want to know the right formula ,how to calculate the Spectral efficiency for 3G and LTE
also which factors can effect the efficiency of the spectral
i used the below formula,
Spectral Efficiency (b/s/Hz)= Total Throughput (bps)/Bandwidth(Hz)



Take a look at this Wiki, it might help you https://en.wikipedia.org/wiki/Spectral_efficiency

Interesting to note the research going into Massive MIMO http://www.microwavejournal.com/articles/28974-from-mimo-to-massive-mimo "spectral efficiency of nearly 80 bits/s/Hz"

[mounir34]

thanks freind ,this is a theorique stat i want to know which factors cn affect the specrtal efficiency ,thx


Hi mounir34.
Maybe I don't understand your question.
Spectrum Efficiency is inherent in the technologies and shows how many bits can be transmitted per Hz (bps/Hz).
For instance (got from internet), following are the spectrum efficiency for some technologies.

40879

Hope it helps
Nyquist

[wolverine]

Have a look at the attached. It should give you some ideas..

[mounir34]

thanks dear, do you have the same for Huawei ?

Have a look at the attached. It should give you some ideas..

[electron]

Have a look at the attached. It should give you some ideas..

Hi,

That's a nice document. Anyhow i have seen some operators that calculating Spectral efficiency irrespective of PRB utilization which is actually wrong approach and in Qualcom apparently they considered correct formula and included PRB Utilization as well.


Cheers

[mdvillaluz]

Unit is to be bits/s/Hz --> which will translate to throughput per used Hz.
If you will be using counters, I think that u can use (Total DownLoaded bits/Total Transmit Time (removed last TTI)) / PRB Used / 180kHz..
But averaging in 1 hr basis using counters may have impact on this...
U can use drive test data though..



Hi,

That's a nice document. Anyhow i have seen some operators that calculating Spectral efficiency irrespective of PRB utilization which is actually wrong approach and in Qualcom apparently they considered correct formula and included PRB Utilization as well.


Cheers

[mounir34]

dear
please if you have the complete formula for huawei thanks to share it with us


Unit is to be bits/s/Hz --> which will translate to throughput per used Hz.
If you will be using counters, I think that u can use (Total DownLoaded bits/Total Transmit Time (removed last TTI)) / PRB Used / 180kHz..
But averaging in 1 hr basis using counters may have impact on this...
U can use drive test data though..

[mounir34]

i used the below formula is it correct ?

Spectral Efficiency (b/s/Hz): Total Throughput (bps)/Bandwidth(Hz)

Cell Uplink Average Throughput (kbps) : [L.Thrp.bits.UL]/[L.Thrp.Time.Cell.UL.HighPrecision]
Cell Downlink Average Throughput (kbps) : [L.Thrp.bits.DL]/[L.Thrp.Time.Cell.DL.HighPrecision]

[mounir34]

for 3G :

Spectral Efficiency (b/s/Hz): Total Throughput (bps)/Bandwidth(Hz) where


Total Throughput is the sum of:

· Mean Throughput for One HSDPA Cell = VS.DataOutput.Mean/(VS.DataTtiRatio.Mean - VS.HSDPA.InactiveDataTtiRatio.Mean)
· Mean Throughput for One HSUPA Cell: [VS.HSUPA.Thruput.ROTAll]/([VS.HSUPA.DataTtiNum]*{0.002})

[mdvillaluz]

(L.Thrp.bits.DL-L.Thrp.bits.DL.LastTTI)/L.Thrp.Time.DL.RmvLastTTI / Average PRB --- this is how i will intend to formulate..
any suggestion? what do u think?

[rabiwan]

Hi ,

I can't download this document, Please can you give me a direct link. Thank you a lot :)

[linhhy]

for 3G :

Spectral Efficiency (b/s/Hz): Total Throughput (bps)/Bandwidth(Hz) where


Total Throughput is the sum of:

· Mean Throughput for One HSDPA Cell = VS.DataOutput.Mean/(VS.DataTtiRatio.Mean - VS.HSDPA.InactiveDataTtiRatio.Mean)
· Mean Throughput for One HSUPA Cell: [VS.HSUPA.Thruput.ROTAll]/([VS.HSUPA.DataTtiNum]*{0.002})

It's little bit long time. But I think Spectrum effiency taking about how much data traffic a network can support. It means that your network should in condition "fully load". In case of low load, Thrput could become better, it's not show real Spectrum effiency because interference will rise more when more load. To estimate your network effiency you should devide network to "clutter load", meaning almost sites have the same load, then combine the above formula to draw the trend and estimate how much you can get on your network.

[RFNuttapon]

dear
please if you have the complete formula for huawei thanks to share it with us

Dear Sir

For HW vendor
Load evaluation based on spectral efficiencyUse this function when the spectral efficiency difference between inter-frequency cells is large, for example, greater than 30%, and the traffic models of UEs in different frequencies are independently and identically distributed. The spectral efficiency of a cell can be evaluated by using the formula L.Thrp.bits.DL (http://localhost:7890/pages/GEF0215P/04/GEF0215P/04/resources/EN/LTE_FDD/eNodeB/Counter/ratL/enodeb/b-enodeb-perf/Mt-1526728261.html)/L.ChMeas.PRB.DL.Used.Avg (http://localhost:7890/pages/GEF0215P/04/GEF0215P/04/resources/EN/LTE_FDD/eNodeB/Counter/ratL/enodeb/b-enodeb-perf/Mt-1526726740.html), in which the counters are measured at busy hours.

this will be found in MLB feature topic