我们经常会看到听到一些流行词汇，也许并不清楚其全名是什么。

GSM(Global system for mobile)，2G

UMTS(Universal mobile telecommunication system)，3G

LTE(Long term evolution)，4G

5G NR(5G New Radio)，5G新空口

eCall(Emergency call)，2G至5G

C-V2X(Cellular vehicle-to-everything communications)

V2X(Vehicle-to-everything communications)

WLAN(Wireless local area network)，Wi-Fi

NFC(Near field communications)

RFID(Radio frequency identification)

GNSS(Global navigation satellite systems)全球导航卫星系统

美国的叫GPS，欧洲的叫Galileo，中国的叫BeiDou，俄罗斯的叫GLONASS

DVB(Digital video broadcasting)

ISDB-T(Integrated services digital broadcasting terrestrial)

ADAS(Advanced driver assistance systems)