stand-alone dedicated control channel (mobile communications) (SDCCH)

Stand-alone Dedicated Control Channels (SDCCH) are independent channels in GSM systems.

SDDCH channels are switched in the downlink and uplink as control channels and signaling channels and are used to transmit instructions to the mobile station and also to transmit information for signaling such as the subscriber number. The Access Grant Channel( AGCH) is used to transmit the initial orders of the stand-alone Dedicated Control Channel.