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Separate/Stand-alone Dedicated Control CHannel -- 獨(dú)立專用控制信道


SDCCH - Stand-alone Dedicated Control Channel

This channel is used in the GSM system to provide a reliable connection for signalling and SMS (Short Message Service) messages. The SACCH (Slow Associated Control Channel) is used to support this channel.

SDCCH
　　SDCCH的全稱是獨(dú)立專用控制信道（Stand-Alone Dedicated Control Channel），用在分配TCH之前呼叫建立過(guò)程中傳送系統(tǒng)信令。例如登記和鑒權(quán)在此信道上進(jìn)行。上行和下行信道，點(diǎn)對(duì)點(diǎn)方式傳播。一般進(jìn)行的信令交互主要利用SDCCH信道承載，SDCCH信道的分配也稱立即指配過(guò)程。有時(shí)還會(huì)進(jìn)行短信傳輸。

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