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A Radio Access Technology or (RAT) is the underlying physical connection method for a radio based communication network. As of 2013, many modern phones such as the Nexus 4 or iPhone5 support several RATs in one device such as Bluetooth, Wi-Fi, and 3G, 4G or LTE. The term RAT was traditionally used in mobile communication network interoperability, for example, in Virtej et al.,〔 〕 or in the example provided on the Wiki page for Radio access network. More recently, the term RAT is used in discussions of heterogeneous wireless networks. The term is used when a user device selects between the type of RAT being used to connect to the Internet. This is often performed similar to access point selection in IEEE 802.11 (Wi-Fi) based networks.〔 〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「radio access technology」の詳細全文を読む スポンサード リンク
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