name: CBCH
full_form: Cell Broadcast CHannel
context: receive messages if it is connected in the PS domain and no data is currently transmitted.' In GSM system, when UE is in CS-Connected mode and CS service is on going, UE can only receive and decode messages on TCH channel. But CBS message is delivered on CBCH channel. It is not a requirement for UE to listen to both TCH and CBCH in CS-Connected state. So it is not a requirement for UE to receive CBS message in CS-Connected mode. In UMTS system, when UE is in CS-connected mode and CS service is on going, UE is in CELL-DCH state. In CELL-DCH state, UE can only receive and decode messages on physical channel DPDCH/DPCCH. But CBS message is delivered on CTCH channel which is mapped to physical channel S-CCPCH. It is not a requirement for UE to listen to both DPDCH/DPCCH and S-CCPCH in CELL-DCH state. So it is not a requirement for UE to receive CBS message in CS-Connected mode. In case the UE is in PS-Connected mode it depends on the whether reception of CBS messages is possible. If UE is
description: The Cell Broadcast Channel (CBCH) is a logical channel used for broadcasting messages to multiple users in a cell. It's primarily used for emergency alerts or public warning systems.
explanation: CBCH is classified as a Channel because it is a dedicated pathway within the cellular network infrastructure specifically designed for transmitting broadcast messages to a large number of subscribers simultaneously.
section_title: 6.2.9	Roaming impact to PWS Security
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