I've spent a fair amount of time around networking. I've worked for a small ISP, helped to set up campus and office networks and even done a fair amou

How Mobile Networks Work

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2024-09-27 22:00:06

I've spent a fair amount of time around networking. I've worked for a small ISP, helped to set up campus and office networks and even done a fair amount of work with BGP and assisting with ISP failover and route work. However in my current role I've been doing a lot of mobile network diagnostics and troubleshooting which made me realize I actually don't know anything about how mobile networks operate. So I figured it was a good idea for me to learn more and write up what I find.

It's interesting that without a doubt cellular internet is either going to become or has become the default Internet for most humans alive, but almost no developers I know have any idea how it works (including myself until recently). As I hope that I demonstrate below, it is untold amounts of amazing work that has been applied to this problem over decades that has really produced incredible results. As it turns out the network engineers working with cellular were doing nuclear physics while I was hot-gluing stuff together.

I am not an expert. I will update this as I get better information, but use this as a reference for stuff to look up, not a bible. It is my hope, over many revisions, to turn this into a easier to read PDF that folks can download. However I want to get it out in front of people to help find mistakes.