A CDE Definition
(GSM Radio Access Network) The air interface used in early voice-only GSM cellular networks. See RAN.
(Radio Access Network) The air interface in a cellular network. The RAN resides between the user's mobile devices and the core network. For example, GRAN (GSM RAN) was the early voice-only GSM air interface, while GERAN (GSM EDGE RAN) added packet-switched data. U-TRAN (UMTS Terrestrial RAN) is the 3G interface, and E-UTRAN (Evolved-UMTS Terrestrial RAN) is the LTE interface. See C-RAN, 2G/3G architecture, LTE architecture, LTE, 3G, UMTS and GSM.
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