泛歐數位式無線電話 個人通信服務 無線用戶迴路 分頻雙工 分時雙工 動態頻道選擇 手機 基地臺 Digital european cordless telecommunications DECT Personal communications services PCS Radio in the local loop RLL Frequency division duplex FDD Time division duplex TDD Dynamic channel selection DCC Portable part PP Radio fixed part RFP