Physical Layer

實體層控制BITS(被組織成FRAME)的傳輸
錯誤偵測和校正的FUNCTION也在此層被實做
MODULATION: 把BIT, WAVEFORM互轉換也是此層工作

CHANNELIZATION: 分別不同使用者的FUNCTION
(IS-2000/95都是用ORTHOGONAL和NEAR-ORTHOGONAL法分CHANNEL)

Signaling channel: 是指賦載訊號和控制的頻道 可以分為DEDICATED和COMMON兩種types (assigned給單一使用者或是SHARED)

User channel: for user information, voice, low-rate data (SMS) , high-rate (video streaming)
三種physical channels, F-FCH, F-SCCH, F-SCH(新的)