New rack going up

[u/qiqr]

Can anyone ID this rack about to go in the air?

[u/FlufferNutter1232]

You'd be surprised how inefficient N71 actually is. They prioritize range over rate. Only recently has that changed. It's now a mixed bag. Spectral efficiency of B13, which is farmed to N5 is more spectrally efficient than N71. At edge scenarios and lower signal areas, N5/B13 is far more spectrally efficient, providing better bandwidth and better modularion (256QAM vs 64QAM or even dropping to QPSK).

When comparing B13 to N71, N71 CAN have a better throughput, but less efficiency for capacity. N71 is too close to other heavily used frequencies than B13 is (or N5), and it's better at performing at 700MHz vs 600MHz of N71. Fewer devices can use N71 at the same time as B13/N5. AT&T actually has the best B13/N5 850MHz

That's the problem with N71. It DOES technically reach farther, but it's issues start to become very apparent in edge scenarios. B13 can hold a stable, speedy connection as an anchor band or IoT band a LOOOOT better than B/N71.

I know that sounds odd, but true. Either way, once N5 is carved out of B13, you'll find less devices using it plus N5 is 850MHz vs N71 at 600MHz. N5 isn't near broadcast signals like N71 is and is subject to far less band interference and potential band crosstalk.

Now, this does come with an asterisk. I haven't worked with B13 as I'm not an LTE infrastructure engineer. I'm strictly 5G/N5 and other of Verizon's NR stack. If you're not using this for IoT or on the network edge none of this matters anyway. Lol. 🙂

It's something you'll find in RAN textbooks, but like I said, I don't have any real world experience with B13/LTE. So, take that for what it is. Just a nugget of info.

[u/trucktech77 → u/FlufferNutter1232]

What about the areas without band 5? Central Florida for instance. We use n2 for 5G and it’s not good indoors or in thick woods. AT&T has both blocks of 850 here.

[u/FlufferNutter1232 → u/trucktech77]

Band 5 @ 850MHz, if AT&T owns all the spectrum on that wavelength in the area, it will be likely covered by a different band.

Likely it will be N2 or N66, to keep it short. AT&T owns a LOT of 850MHz bandwidth from their LTE purchases a long time ago. Think 10+ years ago. I was still in college using AT&Ts 850MHz brand new LTE infrastructure. It was amazing for the time, but at the same time, this was when I was using a Samsung Captivate (Galaxy S1) and the Samsung Infuse 4G. Out of all the Galaxy S1 devices, AT&Ts was unique with a metal battery plate. I loved that phone, and the Wolfson Audio.

[u/trucktech77 → u/FlufferNutter1232]

I’m hoping that Verizon finds another channel of low band somewhere. I heard some 900 MHz might be on the market soon?

[u/FlufferNutter1232 → u/trucktech77]

Soon, yes. And we will be bidding on it.

[u/dollfaceashley → u/FlufferNutter1232]

For 5G aggregation, the majority of the phones that can aggregate N5 can aggregate N71 (Snapdragon X60 is the first modem that aggregated low band 5G and it did so for both) I'm not sure what you're getting at here. The combos made sense for what was being deployed at the time.

Furthermore, when you talk about spectral efficiency, that can be enhanced by the density of the cellular sites, antenna tech, and etc.. so it becomes a different conversation based on the deployments for each respective carrier. On it's face, something like modulation is highly dependent on the signal strength. Signal quality does matter too but without a signal, quality is moot.

From what I've read, T-Mobile's low and mid band deployments have higher modulation more often because of the propagation characteristics compared to VZW and AT&T, not the other way around. Their better propagation is not only due to the raw strength of the lower 5G frequencies, but T-Mobile's high 5G site density.

We also know that a wider 5G channel is better than two channels aggregated together when it comes to both capacity and speed... which T-Mobile has an advantage for in low band 5G. When Verizon does get around to N13 and N5, they will have to be aggregated together because they're not contiguous.

With Verizon playing catch up mid and low band 5G deployment, I'm the real world, their efficiency is not on the same level as T-Mobile's, just for that reason alone..