Sunday, December 19, 2010

Voice over LTE via Generic Access (VoLGA) A Whitepaper

Voice over LTE via Generic Access (VoLGA) PDF

The roots of 'Voice over LTE via GAN' (VoLGA) are the 3GPP Generic Access Network
(GAN) specifications which add Wi-Fi as an access technology to 3GPP based networks such
as GSM and UMTS. GAN requires dual mode mobile devices which have both a
GSM/UMTS radio interface and a Wi-Fi radio interface. Such mobile devices are available
today from a number of manufacturers including Samsung, Nokia, Sagem, LG, HTC3,
Motorola4, Sony-Ericsson and RIM (Blackberry)5. When these dual-mode devices detect the
availability of a suitable Wi-Fi network, e.g. at home or a public hotspot, they connect to the
Wi-Fi access point and register with the GSM/UMTS core network over the Wi-Fi link and
the Internet. A GAN gateway securely connects a subscriber to the infrastructure of a network
operator and voice calls and other circuit switched services such as SMS are then securely
transported between the mobile device and the Gateway over the intermediate Wi-Fi link and
Internet access network.
VoLGA re-uses this principle by replacing the Wi-Fi access with LTE.
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