this post was submitted on 26 May 2024
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Mildly Infuriating

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[–] DontTreadOnBigfoot@lemmy.world 46 points 5 months ago (1 children)

I mean, yeah - fuck Walmart in general.

But I'm confused. How is Verizon's misleading map Walmart's fault.

[–] Kolanaki@yiffit.net 34 points 5 months ago* (last edited 5 months ago) (4 children)

OP might be inside a Walmart when they took the screenshot. Walmart either uses building materials that impede the signal or actively block it. I also can never get full 5G inside a Walmart, and sometimes I wonder if they are doing it on purpose to encourage using their local wifi. The only other time being inside a building messes with my phone is at the hospital, and I know they have a ton of equipment that could be responsible for that.

[–] terminhell@lemmy.dbzer0.com 18 points 5 months ago

I'd imagine that's part of it. But it's also a big metal building, farady cage and all.

[–] tal@lemmy.today 12 points 5 months ago* (last edited 5 months ago)

Walmarts are big windowless boxes. A cell signal has to go through masonry walls to get out.

5G Ultra Wideband, which is what OP's map is showing to be in the area, and what he's upset about not getting, uses millimeter-wave frequencies, which are fast if they have a clear line to the tower...but don't penetrate material well.

https://www.5gamericas.org/here-comes-millimeter-wave/

On the challenging side of the equation, millimeter waves don’t propagate as far as low-band or mid-band signals, so there is a much smaller target area used to receive a signal, compared with sub-6 GHz signals. In addition, millimeter wave signals are subject to more diffused scattering when in contact with large objects, and they receive higher signal loss from foliage, object penetration, and from the atmosphere. This means you have to put a lot more millimeter wave signal repeaters around, so you get good mmWave coverage.

I suspect that if WalMart wants, they could maybe pay to run femtocells inside the store or something to get more coverage, but if (a) they already have 4G coverage in the store and (b) they're also providing WiFi access, they probably aren't gonna be putting even more network infrastructure in.

[–] Kaboom@reddthat.com 4 points 5 months ago

I get it bad in any large store, mainly because its a very large metal box. Its basically a faraday cage.