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POPUSH notifications via GPRS/3G. How stable are they?
 

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  1. POPUSH notifications via GPRS/3G. How stable are they?
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    <p>I do an application design for a soft real-time software application now. </p> <p>The application will probably need to notify its mobile users about some events in the system. An event can happen during a 15-minute time frame which starts after the user's first interaction with the system. The event notification should be done in soft real-time: if a user notified later than 15-20 seconds he was supposed to be notified, then it is critical. Basically, I need to notify a mobile user about an event no later than 15-20 seconds after that event happens during a 15-minutes time frame.</p> <p>I plan to do that with some kind of <a href="http://en.wikipedia.org/wiki/Push_technology" rel="nofollow noreferrer">PUSH technology</a> (XMPP/Jabber, native app with <a href="http://en.wikipedia.org/wiki/Comet_%28programming%29" rel="nofollow noreferrer">Comet</a> connection or maybe <a href="http://en.wikipedia.org/wiki/Push_email" rel="nofollow noreferrer">PUSH email</a>).</p> <p>Unfortunately, the most obvious solution which is to have mobile web-site (example: <a href="http://www.lightstreamer.com/" rel="nofollow noreferrer">http://www.lightstreamer.com/</a>) with real-time push notifications is not suitable, because in that case the user will have to stare at the screen during all the 15-minute time frame. Notifying a user with a sound or a vibration would be a much more pleasant user experience (connect to the system via smartphone -> start interaction with the system -> put the smartphone back into the pocket or a bag -> get notified).</p> <p>I have done a simple experiment by sending Jabber chat messages between my laptop (WiFi/100Mbit) and my Android smartphone (GPRS/3G). The thing is that some of the messages sent to the smartphone are late (it takes about 1 minute until they arrive at the smartphone) or just lost (they never arrive at the smartphone). Moreover, I have noticed that the Jabber client at the smartphone goes offline regularly for a few seconds. I do not know if it is because I have a very cheap Android smartphone or because the 3G connection is not very good, but this behaviour is not acceptable for the software application that I design.</p> <p>Thus, I am interested in the following:</p> <ul> <li>is there any technology standard that can <em>guarantee</em> pushed message delivery to mobile (GPRS/3G) consumers in <em>soft real-time</em>? I.e. a technology standard which guarantees that a mobile client will be notified no later than N seconds from now;</li> <li>do you know any examples of mobile apps which have soft <em>real-time</em> push notifications?</li> <li>what are the ways to address the issue of delivering/pushing soft real-time messages to mobile devices in soft real-time? (e.g. keep sending the same message until the mobile device confirms the receipt of the message)</li> </ul> <p><em>P.S. The intended use of the software application is with any smartphone, be it iPhone, Android, WP or any other internet-connected smartphone.</em></p> <p><em>Note: This question is similar to <a href="https://stackoverflow.com/questions/10499388/real-time-two-side-push-communication-via-gprs">one</a> of my previous questions, but this one is about on a completely different use-case with strong focus on soft real-time requirements.</em></p>
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    1. CODid you find the technology that guarantees max N seconds delay?
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