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On the way back to Austin, noticed that more sites are now running 15x15 B2, which nets speeds like this with 20 MHz n71:

There's definitely overlap between lightly loaded low band NR and unoptimized 40 MHz n41.

EDIT: Also saw 15+20 MHz B41 on the way back, on Sprint (above 2600 MHz). GOt 134/6 going down the highway, so TMo seems committed to providing keep sites with sufficient backhaul.

Back in Austin, B41 from the n71/n41 site seems a bit more reliable now, pulling -102 RSRP and ~130 down, though lack of HPUE on my S20 means I was only able to push ~2 Mbps up (which is I'm sure why B41 isn't prioritized, to the point that last week my brother's g fast sat on B2 even right next to the tower).

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Looks like 80 MHz is not yet universal; the Spicewood Springs and Mesa site is still running 40 MHz, while the Spicewood Springs and 360 (up the hill a bit) site is running 80. The former overlaps bas

I spent Friday evening through Sunday morning in an area with 20 MHz of T-Mobile spectrum deployed: 10x10 of B71, 10x10 of B2. Confirmed when driving back from there (Brackettville) that T-Mobile puts

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Sprint B41 has been moved up so the top carrier is sitting at the very top of the band (2680 MHz center frequency). I'm sure this impacts coverage a little but in return they seem to be back to 2CA here, so I can hit ~150/10 1500' from the cell site again.

TMo really does need to add more n71 sites around here though; a couple miles south of me appeared to be LTE-only, and they have plenty of sites that they could retrofit. Of course, if they're planning on adding n41 and n71 simultaneously to a site or two, fair enough.

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They've dialed in n41 a bit more on the site with it nearest me. Getting the signal back to the cell site appears to be a serious issue, but still, progress!

Forcing B41 at the same exact location gets me about half that speed, and I'm sure n41 is already carrying more traffic than TMo B41, so...not bad, I guess.

 

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  • 5 weeks later...

So, all of my nearby T-Mobile sites are offline right now due to blackouts. Closest signal is B12 in the mid -120s...no B71 etc.

Fortunately the Sprint rooftop site near me still has power somehow, and TMo very recently (last hour or two) added back a B41 carrier centered at 2680 MHz, next to the 2660 one, so connectivity is fine as long as you're close enough to the site to get B41. B25 is a mess though...probably 26 as well.

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9 hours ago, iansltx said:

So, all of my nearby T-Mobile sites are offline right now due to blackouts. Closest signal is B12 in the mid -120s...no B71 etc.

Fortunately the Sprint rooftop site near me still has power somehow, and TMo very recently (last hour or two) added back a B41 carrier centered at 2680 MHz, next to the 2660 one, so connectivity is fine as long as you're close enough to the site to get B41. B25 is a mess though...probably 26 as well.

Same in Houston. Areas with blackouts have a lot of T-Mobile sites down even though they have permanent gas generators on site. My guess is backhaul is an issue.

Sprint network is useless in these areas as well as they take on T-Mobile users who are roaming.

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11 hours ago, greenbastard said:

Same in Houston. Areas with blackouts have a lot of T-Mobile sites down even though they have permanent gas generators on site. My guess is backhaul is an issue.

Sprint network is useless in these areas as well as they take on T-Mobile users who are roaming.

Stuff's somewhat recovered here cell network wise, though the Sprint site I was using before is now offline. TMo finally figured out how to run B41 again from the NR-enabled site, which is nice, as that covers a mile or so radius, including a fair number of folks without power.

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On 2/16/2021 at 12:05 PM, iansltx said:

Stuff's somewhat recovered here cell network wise, though the Sprint site I was using before is now offline. TMo finally figured out how to run B41 again from the NR-enabled site, which is nice, as that covers a mile or so radius, including a fair number of folks without power.

A lot of Houston sites have generators. yet they're still going offline with the blackouts. What a huge disappointment on T-Mobile's part. Even now that most of the power is back, sites are staying offline. AT&T kept working even through the blackouts, yet T-Mobile offered absolutely no roaming for basic calling/texting. Total disappointment. There needs to be some type of local and state investigation on the failure of basic communications. It's unacceptable. My guess is backhaul failed for T-Mobile.

You can also tell that T-Mobile now owns Sprint as that network also failed miserably. Back during Hurricane Ike, Sprint kept going even with the power outage. Not your time around.

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What kind of generators are in use?  Natural Gas fired?  From what I understand, natural gas delivery is also an issue.

 

Diesel?  Gelled up diesel could cause problems as well.  

 

Neither of the above issues would happen during a hurricane.

 

Not making excuses, just pointing out that sometimes even backup ideas fail,

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On 2/19/2021 at 11:01 AM, shaferz said:

What kind of generators are in use?  Natural Gas fired?  From what I understand, natural gas delivery is also an issue.

 

Diesel?  Gelled up diesel could cause problems as well.  

 

Neither of the above issues would happen during a hurricane.

 

Not making excuses, just pointing out that sometimes even backup ideas fail,

Generators in my area are all Natural Gas. I also know that my area never lost natural gas. The natural gas outage was very limited to a few areas in Houston, so it wouldn't have impacted T-Mobile's ability to fire up their generators (it sure didn't affect AT&T).

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Confirmed that the site behind the Randall's at Spicewood Springs and Mesa in NW Austin has n41, as well as some pretty well optimized B2. Will swing by at some point later to get panel shots. 2CA B41 was also deployed but latency/jitter were unreasonably high for some reason.

 

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80 MHz n41 is now live in Austin!

Center frequency is 2607.75 MHz, so the carrier runs from 2567-2647. B41 2CA is below that. That could leave room at the top of the band for one or two Sprint B41 carriers, but the site nearest me on Sprint has been down since nearly two weeks ago so I'm not sure what's there.

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Looks like 80 MHz is not yet universal; the Spicewood Springs and Mesa site is still running 40 MHz, while the Spicewood Springs and 360 (up the hill a bit) site is running 80. The former overlaps basically completely with the bottom half of the latter. Both sites appear to have 2CA B41 deployed right below (as in, eating into guard bands of) the NR carrier (2538, 2558 center freqs).

The site near 360 appears not to be backhaul limited :)

 

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