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CBS (Cell Broadcast Service)
Just in terms of user experience, CBS may look like a kind of Short Message service(SMS) or USSD (your device would popup a notification signal or text string as it recieves CBS message). But if you gets into a little bit deeper, you would notice that CBS and SMS/USSD has completely different foundation.
First, you would see high level difference as follows :
More importantly, CBS and SMS/USSD are transmitted by completely different channel and mechanism. Whereas SMS/USSD is transmitted by DCCH->DPCH as normal signaling message, CBS is using its own independent channel (CTCH-> SCCPCH) as shown below. (Channel Configuration for CBS is configured in SIB5 or SIB5bis)
CBS Message parameter and an example is shown here.
Reference :
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