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how Apple's design kills a network

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Mr Steve Cheney's Jun/2010 article on is a good read for performance design

But here’s the fascinating point: the signaling issues aren’t just AT&T’s fault. In a quest to extend battery life on the iPhone, Apple did something 'non-standard' which compounds the issues – the iPhone constantly drops connections, going in to an idle state. Keepalives within the apps then reestablish a new connection after only a few seconds. Network equipment makers never anticipated this. Think of it as hanging up during a phone call when the line is silent, and then redialing to respond.

AT&T’s issues are not primarily around spectrum or backhaul. Instead, they center around 'signaling', which smartphones rely on for polling, status and control updates.

Please read the original article via the link above to view the details.

[btw: http keep-alives were created as a solution to this kind of network overload.
With http, the keep-alive means, don't close the connection too soon - - keep it to allow another transaction :) ]

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