4 ms·

It's straightforward QoS management. Public service users get absolute priority, even if that means kicking everyone else off the network. After that, voice and

It's straightforward QoS management. Public service users get absolute priority, even if that means kicking everyone else off the network. After that, voice and SMS get priority, because they're important to users and have very low data rates. IP traffic can have whatever's left on a fair queuing basis. Most operators use deep packet inspection and can perform fairly sophisticated traffic shaping.

taeric 9y ago
That makes some sense. But "kicking people off" is a crappy answer. Especially since you are setting up a constant storm of users trying to reconnect. Easy to see how that will not play well with idle connections.
- jdietrich 9y ago
  >Especially since you are setting up a constant storm of users trying to reconnect. The network isn't that dumb. The technical details are far beyond the scope of a HN comment, but the network can gracefully deny service to users. Think about what happens if you run out of data allowance or prepaid credit - your phone doesn't frantically spam the network, it just asks for service and is politely told to try again later. If all else fails, you can just de-register all the devices connected to a given cell site and revert them to emergency calls only.
  - taeric 9y ago
    Right, that was why I was asking if someone had a good link to read on. :) And, honestly, from the way I've seen phones behave on older wifi networks, I would be surprised if some aren't actually spamming the network. Unnecessarily fast. Worse, I would hope the network has some protection built in for the bad actors that do.
    - Rjevski 9y ago
      > the network has some protection built in for the bad actors that do. They don't. It's extremely easy to DoS an off-the-shelf (Ericsson, etc) mobile network if you know what to do. All it takes is one packet per minute or so. ;)

4 ms·

It's straightforward QoS management. Public service users get absolute priority, even if that means kicking everyone else off the network. After that, voice and

by jdietrich 9y ago

taeric 9y ago
That makes some sense. But "kicking people off" is a crappy answer. Especially since you are setting up a constant storm of users trying to reconnect. Easy to see how that will not play well with idle connections.
- jdietrich 9y ago
  >Especially since you are setting up a constant storm of users trying to reconnect. The network isn't that dumb. The technical details are far beyond the scope of a HN comment, but the network can gracefully deny service to users. Think about what happens if you run out of data allowance or prepaid credit - your phone doesn't frantically spam the network, it just asks for service and is politely told to try again later. If all else fails, you can just de-register all the devices connected to a given cell site and revert them to emergency calls only.
  - taeric 9y ago
    Right, that was why I was asking if someone had a good link to read on. :) And, honestly, from the way I've seen phones behave on older wifi networks, I would be surprised if some aren't actually spamming the network. Unnecessarily fast. Worse, I would hope the network has some protection built in for the bad actors that do.
    - Rjevski 9y ago
      > the network has some protection built in for the bad actors that do. They don't. It's extremely easy to DoS an off-the-shelf (Ericsson, etc) mobile network if you know what to do. All it takes is one packet per minute or so. ;)