HSCSD的精选

1、Inmobiletelephony,2.5Gprotocolsextend2Gsystemstoprovideadditionalfeaturessuchaspacket-switchedconnection(GPRS)andenhanceddatarates(HSCSD,EDGE).2、在移动德律风技巧中，2.5G和谈将2G系统扩展到供给诸如分...