Question: Which control channel is used for transmitting dedicated control information between a UE (User Equipment) and the network, specifically when an RRC (Radio Resource Control) connection has been established?
Option 1: Dedicated Control Channel (DCCH) - A point-to-point bi-directional channel for UEs with an RRC connection.
Option 2: Common Control Channel (CCCH) - Used for UEs without an RRC connection to transmit control information.
Option 3: Paging Control Channel (PCCH) - Utilized for paging when the network is unaware of the UE's location cell.
Option 4: Broadcast Control Channel (BCCH) - A downlink channel for broadcasting general system control information.
Explanation: The Dedicated Control Channel (DCCH) is specifically designed for point-to-point bi-directional communication between a UE and the network, particularly when an RRC connection is established. This contrasts with other channels like CCCH, which is used when no RRC connection exists, or PCCH and BCCH, which serve different purposes related to paging and system information broadcasting, respectively.