5.2 Logical Channel

1. Control channel

The following control channels are only used to transmit the information of control plane:

Broadcast Control Channel (BCCH): Downlink channel used to broadcast system messages.

Paging Control Channel (PCCH): Downlink channel used to send paging messages.

Common Control Channel (CCCH): Bidirectional channel used to send control messages between the network and UE. This channel is mapped to RACH/FACH transport channel. Identifiers of long UTRAN UE (U-RNTI, including SRNC) are required in this channel, which ensures the uplink messages to be sent to the correct SRNC.

Dedicated Control Channel (DCCH): Bidirectional channel used to send control messages between the network and UE. This channel is allocated by the network to the point-to-point dedicated channel of the UE when RRC is built.

2.  Traffic channel

The following traffic channels are only used to transmit the information of user plane:

Dedicated Traffic Channel (DTCH): Bidirectional point-to-point channel dedicated for one UE and used to transport user information.

Common Traffic Channel (CTCH): Point-to-point down link used to transport the dedicated user information for all or a group of UEs.