name: CBS
full_form: Cell Broadcast Service
context: 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 in PS-Connected mode and no data is currently transmitted, UE is in CELL_PCH or URA_PCH state. In CELL_PCH or URA_PCH state, UE can listen to physical channel S-CCPCH and receive CBS message. If UE is in PS-Connected mode and some data is currently transmitted, UE is in CELL_DCH or CELL_FACH state (depends on algorithm of network side). In CELL_DCH state, UE can not listen to physical channel S-CCPCH and can not receive CBS message as described above. In CELL_FACH state, UE can transfer data and receive CBS message. Based on above analysis, it is not possible for a CS-Connected UE to receive CBS warning message. Even if UE has to wait for CS service terminated and then performs LAU at once to update PWS key, there is no impact on PWS key updating and warning message verification. In
description: Cell Broadcast Service (CBS) is a telecommunications offering that enables the dissemination of messages to mobile devices in a specific geographic area. It is used for emergency alerts, public warnings, and other types of broadcasts.
explanation: The text describes CBS as a service that transmits messages to mobile devices within a defined geographical area. This functionality aligns with the definition of a telecommunications service.
section_title: 6.2.9	Roaming impact to PWS Security
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