One Article Review
| Source |  Errata Security |
|---|---|
| Identifiant | 413895 |
| Date de publication | 2017-10-01 21:13:16 (vue: 2017-10-01 21:13:16) |
| Titre | Microcell through a mobile hotspot |
| Texte | I accidentally acquired a tree farm 20 minutes outside of town. For utilities, it gets electricity and basic phone. It doesn't get water, sewer, cable, or DSL (i.e. no Internet). Also, it doesn't really get cell phone service. While you can get SMS messages up there, you usually can't get a call connected, or hold a conversation if it does.We have found a solution -- an evil solution. We connect an AT&T "Microcell", which provides home cell phone service through your Internet connection, to an AT&T Mobile Hotspot, which provides an Internet connection through your cell phone service.Now, you may be laughing at this, because it's a circular connection. It's like trying to make a sailboat go by blowing on the sails, or lifting up a barrel to lighten the load in the boat.But it actually works.Since we get some, but not enough, cellular signal, we setup a mast 20 feet high with a directional antenna pointed to the cell tower 7.5 miles to the southwest, connected to a signal amplifier. It's still an imperfect solution, as we are still getting terrain distortions in the signal, but it provides a good enough signal-to-noise ratio to get a solid connection.We then connect that directional antenna directly to a high-end Mobile Hotspot. This gives us a solid 2mbps connection with a latency under 30milliseconds. This is far lower than the 50mbps you can get right next to a 4G/LTE tower, but it's still pretty good for our purposes.We then connect the AT&T Microcell to the Mobile Hotspot, via WiFi.To avoid the circular connection, we lock the frequencies for the Mobile Hotspot to 4G/LTE, and to 3G for the Microcell. This prevents the Mobile Hotspot locking onto the strong 3G signal from the Microcell. It also prevents the two from causing noise to the other.This works really great. We now get a strong cell signal on our phones even 400 feet from the house through some trees. We can be all over the property, out in the lake, down by the garden, and so on, and have our phones work as normal. It's only AT&T, but that's what the whole family uses.You might be asking why we didn't just use a normal signal amplifier, like they use on corporate campus. It boosts all the analog frequencies, making any cell phone service works.We've tried this, and it works a bit, allowing cell phones to work inside the house pretty well. But they don't work outside the house, which is where we spend a lot of time. In addition, while our newer phones work, my sister's iPhone 5 doesn't. We have no idea what's going on. Presumably, we could hire professional installers and stuff to get everything working, but nobody would quote us a price lower than $25,000 to even come look at the property.Another possible solution is satellite Internet. There are two satellites in orbit that cover the United States with small "spot beams" delivering high-speed service (25mbps downloads). However, the latency is 500milliseconds, which makes it impractical for low-latency applications like phone calls.While I know a lot about the technology in theory, I find myself hopelessly clueless in practice. I've been playing with SDR ("software defined radio") to try to figure out exactly where to locate and point the directional antenna, but I'm not sure I've come up with anything useful. In casual tests, it seems rotating the antenna from vertical to horizontal increases the signal-to-noise ratio a bit, which seems counter intuitive, and should not happen. So I'm completely lost.Anyway, I thought I'd write this up as a blogpost, in ca |
| Envoyé | Oui |
| Condensat | $25 000 25mbps 2mbps 30milliseconds 400 4g/lte 500milliseconds 50mbps about accidentally acquired actually addition all allowing also amplifier analog another antenna antenna pointed any anybody anything anyway applications are area asking at&t avoid away barrel basic beams because been better bit blogpost blowing boat boosts but cable call calls campus can case casual causing cell cellular circular clueless come company completely connect connected connection connectivity conversation corporate could counter cover defined delivering didn directional directly distortions does doesn don down downloads dsl electricity end enough even everything evil exactly extend family far farm feet figure find found frequencies from garden get gets getting gives going good great half happen has have high hire hold home hopelessly horizontal hotspot house however idea imperfect impractical increases inside installers instead internet intuitive iphone just knew know lake latency laughing lifting lighten like load local locate lock locking look lost lot low lower make makes making mast may messages microcell might mile miles minutes mobile money myself newer next nobody noise normal not now only onto orbit other out outside over pay phone phones playing point possible practice presumably pretty prevents price professional properties property provides purposes quote radio ratio really right rotating sailboat sails satellite satellites sdr seems service setup sewer should signal signals since sister small sms software solid solution some southwest speed spend spot states strong stuff suggestion suggestions sure talk technology terrain tests than that them then theory thought through time tower town tree trees tried try trying two under united use useful uses usually utilities vertical water well what where which who whole why wifi wired wish work working works would write your |
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