For the purposes of the present document, the following terms and definitions apply:
CBS message reference:
An information message broadcasted on the basic or extended cell broadcast channel (CBCH) in unacknowledged mode to mobile stations located within the Cell Broadcast area. A CBS message may contain information such as road traffic or weather information, originating from a Cell Broadcast Entity (CBE) communicating with the CBC (see TS 23.041
Uniquely identifies a CBS message by the four elements: Message Identifier, Serial Number, Cell Identifier and Channel Indicator.
Cell Broadcast area:
CBS message operational state:
An area comprising of one or more cells in which the CBS message or the emergency message is broadcasted. A Cell Broadcast area is always contained within a BSC area (see TS 23.002
A cell in CBS message operational state is able to broadcast CBS messages.
Emergency message operational state:
A warning message conveying a small amount of data to indicate the imminent occurrence of an emergency such as earthquake, tsunami etc. The emergency message is broadcasted to mobile stations in idle mode, packet idle mode and dedicated mode (see TS 44.018
) and to mobile stations in packet transfer mode and dual transfer mode (see TS 44.060
) located within the Cell Broadcast area.
A cell in emergency message operational state is able to broadcast emergency messages.
Emergency message reference:
Uniquely identifies an emergency message by the three elements: Message Identifier, Serial Number and Cell Identifier.
CBSP consists of Elementary Procedures (EPs). An Elementary Procedure is a unit of interactions between the CBC and the BSC. These EPs are defined separately and are intended to be used to build up complete sequences in a flexible manner. If the independence between some EPs is restricted, it is described under the relevant EP description. Unless otherwise stated by the restrictions, the EPs may be invoked independently of each other as stand alone procedures, which can be active in parallel. Support of parallel procedures in the BSC is optional.
An EP consists of an initiating message and possibly a response message. Two kinds of EPs are used:
Class 1: Elementary Procedures with response (success or failure).
Class 2: Elementary Procedures without response.
For Class 1 EPs, the types of responses can be as follows:
A signalling message explicitly indicates that the EP is successfully completed.
A signalling message explicitly indicates that the EP failed.
On time supervision expiry (i.e. absence of expected response).
Class 2 EPs are always considered as successful.
For the purposes of the present document, the following abbreviations apply:
Base Station Controller
Cell Broadcast Centre
Cell Broadcast Channel
Cell Broadcast Entity
Cell Broadcast Service
Cell Broadcast Service Protocol
Earthquake and Tsunami Warning System
Short Message Service Cell Broadcast