Umts Tecnologia Hscsd - Csd
(Redirected from Unlicensed Mobile Access)The Generic Access Network (GAN) was formerly known as Unlicensed Mobile Access (UMA), until it was adopted by the 3GPP in April 2005. It describes a telecommunication system allowing seamless roaming and handover between local area networks and wide area networks using the same dual-mode mobile phone.
The local network could be based on private unlicensed spectrum technologies like Bluetooth or 802. 11. The wide network is alternatively GSM/GPRS or UMTS mobile services. Circuit Switched Data.
It lets mobile operators deliver voice, data and IMS/SIP (IP Multimedia Subsystem/Session Initiation Protocol) applications to mobile phones on local networks. Its ultimate goal is the convergence of mobile, fixed and Internet telephony (Fixed Mobile Convergence).
On the cellular network, the mobile handset is communicating over the air with a base station, through a base station controller, to servers in the core network of the carrier. Under the GAN system, when the handset detects a LAN, it establishes a secure IP connection through a gateway to a server called a GAN Controller (GANC) on the carrier's network. The GANC translates the signals coming from the handset to make it appear to be coming from another base station. FAX gruppo 3, Classi 1&2 CSD asincrono-non trasparent fino a 96 kbps.