Cell Broadcast Service or Public Warning System in 5G

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  • Cell Broadcast Service or Public warning system is part of 5G cell broadcast mechanism.
  • Cell Broadcast Centre Function(CBCF), is generic broadcast centre responsible for all kind of broadcast messages including paid advertisement.
  • Public Warning System(PWS) is specific to public warning related broadcast messages like Earthquake, Tsunami etc.
Cell Broadcast and public warning system topology
  • Both the entities can Write/Replace/Cancel broadcast messages to AMF via Namf SAP(N50) interface.
  • When writing Broadcast message to AMF, CBCF/PWS need to provide the content of the message, message ID, number of broadcast, broadcast intervals etc.
  • At any point of time CBCF/PWS can cancel a broadcast by specifying the message ID that is currently actively broadcasted.

Warnning message delivery procedure in NG-RAN

Write/Replace Warnning message by AMF to NG-RAN

PWS Cancel Procedure

PWS Restart indication

PWS Failure Indication

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