|Cell Broadcast is a technology that allows a text
or binary message to be defined and distributed to all mobile
terminals connected to a set of cells. Whereas SMS messages
are sent point-to-point, Cell Broadcast (SMS-CB) messages are
sent point-to-area. This means that one SMS-CB message can reach
a huge number of terminals at once. In other words, SMS-CB messages
are directed to radio cells, rather than to a specific terminal.
SMS-CB is an unconfirmed push service, meaning that the originator
of the message does not know who has received the message, allowing
for services based on anonymity.
A Cell Broadcast Entity (CBE)
is a multi-user front-end that allows the definition and control
of SMS-CB messages. A CBE can be located at the site of a content
provider. At the site of the operator a so-called Cell Broadcast
Centre (CBC) is located. The CBC is the heart of the Cell Broadcast
System and acts as a server for all CBE clients. It takes care
of the administration of all SMS-CB messages it receives from
the CBEs and does the communication towards the GSM network.
The GSM network itself takes care of delivering the SMS-CB messages
to the mobile terminals.