tag:blogger.com,1999:blog-1834236085756782640.post3383233801192415407..comments2024-03-21T14:19:53.378+00:00Comments on The 3G4G Blog: Seamless offloading between Cellular Network and WLAN (CNW)Zahid Ghadialyhttp://www.blogger.com/profile/11618208626682295272noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-1834236085756782640.post-58494612470288952242012-07-20T19:44:44.771+01:002012-07-20T19:44:44.771+01:00Zahid,
The Generic Access Network (GAN) specifica...Zahid,<br /><br />The <a href="http://en.wikipedia.org/wiki/Generic_Access_Network" rel="nofollow">Generic Access Network (GAN)</a> specification initially introduced in 3GPP Release 6 defines how to do this. <br /><br />GAN (aka UMA) has been the technology behind <a href="http://t-mobile-coverage.t-mobile.com/4g-wireless-broadband-service" rel="nofollow">T-Mobile’s Wi-Fi Calling</a> service. Blackberry device from T-Mobile with Wi-Fi Calling support seamless in-call (and data session) handover. So handover has been commercially available in the US for years.<br /><br />With the current situation at RIM, I’m not sure if the seamless handover feature is in their newest devices. It's a lot of work. <br /><br />Recently T-Mobile (and others) moved away from the seamless handover requirement. <br /><br />As you pointed out in an earlier post, this is similar to a femto 'app' concept, where the Wi-Fi AP gets femto characteristics. <br /><br />On my VoLTE blog, I posit that support for <a href="http://voiceoverlte.typepad.com/voice-and-sms-over-lte/2012/05/volte-wi-fi-lte-femto.html" rel="nofollow">VoLTE over Wi-Fi will reduce (replace?) the need for LTE femtos</a>. <br /><br />steveStevehttps://www.blogger.com/profile/08842299940187829570noreply@blogger.com