andrew.woronkov In the region, they seem to make a two-layer grid - the nearest territory is collected on LTE b7, UMTS b1 DC, and in the far one - UMTS b8, LTE b3, b20. The only problem is that they do not have b20 everywhere.

sandwern,
Interesting experiment. I saw one thing there - TD4 was used on one cell, and TD2 - on the other.
It is possible that the mode switching settings for different cells are different (one cell is all "on the drum" - get TD4 and sign it, and the other settings are different).
Probably, there are also timeouts for transfer - say for 5 minutes, the link will support TD4? even if the signal subsided and the client "went")))
In general, these are all fantasies - how the manufacturers did, what settings the “exploiters” have done - this is not known to science)))

Another stupid question from me - in B7 in St. Petersburg for T2 needed a conversion? By the time T2 launched LTE in 1800, St. Petersburg already had networks in B7, and it seems like all B7 was clean and licenses were purchased for it. (B7: MF + Yota from 2012, MTS from 2014, Bi seems to be from 2011, and everyone at the beginning built the network at 2600, and for some reason T2 took and started building from 2015 in B3?)
What did you mean by spectrum conversion? Maybe I misunderstood something?

Here an interesting observation of Beeline made:
There is a blocked SIM, I switch the LTE bands in the modem's web-muzzle, I get this result
B1 2100 and B8 900 - no network,
B3 1800 and B7 2600 andB20 800 !!! - restriction in the network. It turns out that Beeline and something in B20? Although earlier, when I did tests (on the active SIM card), I did not want to connect to this range of the modem.

Post has been editedandrew.woronkov - 08.05.17, 18:27

She was required for all. I can not say how realistic physically, but corruption is accurate.
On the second point, they launched at the lowest cost, that is, they simply turned on the already rebuilt LTE-ready 1800 MHz grid, which was still being built by the Swedes. It was suicide to enter the market from 5 MHz to b3, and there was no equipment on b7. That gave birth in a quick way, that was.
As for MegaFon and b3 in the city, today I noticed that this is purely under Sapsans, it seems. Because at one point they have b7 2x20, b20 1x5, b3 1x5. Obviously, sharpening under the "compatibility" with the most popular band in the world on the highway.

Posted 05/08/2017 18:29:


And this is exactly Beeline? It can easily be a limited connection to the MF or MTS.

Post has been editedThananos md - 08.05.17, 18:27

Yes, now, probably, all smarts can already B3, B7, B20 (the only thing that the Yabloko could not include some ranges in their stubs - true, then it becomes understandable why the MF suddenly decided to spud the Moscow-Peter highway with the B3 range - for the sake of Moscow guests)))


By the way, yes - maybe so - although ... Connect to provide an emergency call to another operator in LTE 800? where the voice does not go.
Although, FIG knows it, and how, it may really want to do roaming to another operator ... But it will be necessary to follow this all the same ...

Post has been editedandrew.woronkov - 08.05.17, 18:49

andrew.woronkov,
Yabloko (starting with 6) all have 3/7/20

zikasak I think it's not about apples. Most likely the solution is that it is unprofitable to cover b7 railway tracks - a range is needed here, not capacity. B20 is not supported by all balalaikas, especially Chinese ones (hello to Xiaomi, who officially came to the Russian Federation). So it was decided to build b3.

Posted 05/08/2017 18:53:


VoLTE has a profile of 112 already.

which on almost all devices intended for the RF adds B20.

But, indeed, it is possible because of the share of Chinese without B20, and B3 from the available - optimally in terms of speed and penetration.

And why no one, when discussing networks in B3, rememberedby this?
In this aspect, B3 is significantly more profitable than B20.

Posted 05/08/2017 18:57:


This is where he adds?
You want to say that in selling in Russia, for example, Mi5 is supported by B20?
Or is Mi5 just a rare exception to the rule?

vvevvevve so it is about the main course of the OZD now and that in the rest of the city Mega uses b3 only in the metro (although it is also not clear why).

Posted 05/08/2017 18:58:


Judging by their office. dealersSmart Orange- does not add, b20 is not declared in them.

Post has been editedThananos md - 08.05.17, 19:01

vvevvevve,
All current line Redmi - with b20. Mi note 2 - with B20.

But I really, not quite right.

Posted 05/08/2017 19:03:


on mi.com more accurate specifications.

So how many there are, in this turn, settlements with a population of over 1000 people? If you use B20, then in each of them you need to put a tower. And if in B3, then not in all, but only in those where there are more than 2000. At the same time, the towers are the same for both ranges, they are the same.

Well, there, too, "from 2000 people" ... :)

Referring to the official. Other devices Xiaomi in Russia prohibits the import and in this they are actively helping customs.

Thanatos MD,
And mi.com/ru then what? Xiaomi official website in the Russian Federation

Post has been editedzikasak - 08.05.17, 19:07

So there recently was 40 MHz 2600 ...


Posted 05/08/2017 19:09:


It does not matter, because B20 in the region they launched and the requirement is a requirement. So the most sensible explanation is still with balance compatibility / range.

Posted 05/08/2017 19:10:


The site can promise anything. But what the dealer brings in is to look from this very "Smart Orange".

Yes, but what does this Russia and this Smart Orange have to do with it, does it live forever?
Do these models, bought, according to tradition, in China, do not support the B20?

Posted 05/08/2017 19:11:


So it's in B7. For each range, as I understand it, the "burden" acts separately.

on b20, there are limitations to deployment, hampered by the work of anti-missile defense systems, as well as the work of military and civil airfields. The existing rules do not allow the use of frequencies within a radius of 40 km from airports.

Is this tactical data? It’s just that Mega insolently exploits the b20 along the Pulkovo Highway under the nose of the ATC services.
It seems to have taken on the 400th ATC?

Posted 05/08/2017 19:19:


Not. Just as the frequency decreases, the requirements for the overall coverage of the LTE network increase.

Thananos md , about the relevance of not sure, look for

40 km from Pulkovo will hit the floor of St. Petersburg)))

New enough Xiaomi Redmi 4X does not seem to support - at least those that are being dragged from China.
They, as always - make different hardware versions of modems.

LTE-800 - no closer than 16 km from airfields (airports) and radar positions
On the use of radio frequency bands 791-862 MHzAppendix 1 and 3
in Kazan, in general, there are 2 airports, one outside the city, 20 km away, a second aircraft factory within the city limits, which is probably why we have no b20