How many times....

[DaQue]

I trying to figure out how much mire data a full 3 band lte site would be compared to 3g. 800/1900 Lte what 12x each over evdo? 24x for the td-lte? That would be 1+12+12+24 or 49x what I am used to.

 

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[koiulpoi]

Maximum bandwidth of a single EV-DO carrier is ~3.2 Mbps. Three sectors/carrier makes that ~9.6 Mbps.

 

Maximum bandwidth of a single 5x5 FDD-LTE carrier is ~37 Mbps. Three sectors/carrier makes that ~111 Mbps. Multiply that by two (as Sprint has a 5x5 on 1900 MHz PCS G Block and a 5x5 on 800 ESMR), to get ~222 Mbps.

 

I have no idea what the bandwidth of a 20 MHz 3:2 TDD-LTE carrier is. Someone else will have to answer that (so I can memorize the answer and how the math works).

 

It's difficult to assign a "multiplier" to this, as different cell sites have differing numbers of EV-DO carriers.

[jefbal99]

Don't forget to add in a bit for the voice carriers

 

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[WiWavelength]

I have no idea what the bandwidth of a 20 MHz 3:2 TDD-LTE carrier is. Someone else will have to answer that (so I can memorize the answer and how the math works).

 

I covered the basic 20 MHz TDD math a few weeks ago in this post:

 

http://s4gru.com/index.php?/topic/4083-sprint-td-lte-25002600mhz-discussion/?p=158089

 

AJ

[koiulpoi]

Don't forget to add in a bit for the voice carriers

 

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Welp, I'm gonna need to know how much bandwidth a 1X carrier has now...

 

I covered the basic 20 MHz TDD math a few weeks ago in this post:

 

http://s4gru.com/index.php?/topic/4083-sprint-td-lte-25002600mhz-discussion/?p=158089

 

AJ

Aha! Exactly what I needed. So ~222 Mbps + (90 Mbps) * 3 [we're still splitting in to three sectors, right?] = ~492 Mbps. So that's ~51.2 times more bandwidth than a single EV-DO carrier.

 

Edit: I suppose I should update my math for proper sigfigs. (37.5) * 3 * 2 + (90.0) * 3 = 495, or ~51.6 times.

[WiWavelength]

Welp, I'm gonna need to know how much bandwidth a 1X carrier has now...

 

Aha! Exactly what I needed. So ~222 Mbps + (90 Mbps) * 3 [we're still splitting in to three sectors, right?] = ~492 Mbps. So that's ~51.2 times more bandwidth than a single EV-DO carrier.

 

Edit: I suppose I should update my math for proper sigfigs. (37.5) * 3 * 2 + (90.0) * 3 = 495, or ~51.6 times.

 

Ah, but that total is like simultaneous orgasm on all carriers and airlinks.  And we know that never occurs in the real world.

 

 

AJ

[koiulpoi]

Ah, but that total is like simultaneous orgasm on all carriers and airlinks.  And we know that never occurs in the real world.

 

 

AJ

Wireless nerd porn?

 

So, what could we expect for "reliable" backhaul to tri-band Sprint sites? We're still short of 500 Mbps, even with all that, and there's almost never a situation where, like you said, you can get maximum speed on everything at once. So 400 Mbps? I couldn't even begin to estimate. Apparently 100 Mbps is good enough for a 5x5 + EV-DO + 1X.

[jefbal99]

Welp, I'm gonna need to know how much bandwidth a 1X carrier has now...

 

Aha! Exactly what I needed. So ~222 Mbps + (90 Mbps) * 3 [we're still splitting in to three sectors, right?] = ~492 Mbps. So that's ~51.2 times more bandwidth than a single EV-DO carrier.

 

Edit: I suppose I should update my math for proper sigfigs. (37.5) * 3 * 2 + (90.0) * 3 = 495, or ~51.6 times.

Still don't have EVDO and 1xA traffic in there, so toss on a few more Mbps

[koiulpoi]

Still don't have EVDO and 1xA traffic in there, so toss on a few more Mbps

Well, the original question was how many times over "3G EV-DO", which as I pointed out early, is difficult to figure out, as sites have differing numbers of EV-DO carriers. So, I just calculated LTE compared to a single EV-DO carrier. 1X and 1XA aren't going to change that number much, maybe not even within a sigfig - and again, different sites may have different number of 1X 1900 carriers.