B.4 PWS-IWF Functionality

23.0413GPPRelease 18Technical realization of Cell Broadcast Service (CBS)TS

B.4.1 PWS-IWF generic functionality

The PWS-IWF is a logical function which functionality is to translate from N50 to SBc.

If the Write-Replace-Warning-Indication and Stop-Warning-Indication or the Restart-Indication-E-UTRAN and Failure-Indication-E-UTRAN are supported on SBc then the PWS-IWF shall manage the subscriptions for the corresponding notifications that may be received over N50.

The PWS-IWF may interface to one or multiple AMFs. The PWS-IWF may interface to one or multiple CBCs. Exceptions from straightforward mapping by the PWS-IWF from SBc based messages and parameters to SBI based messages and parameters are described in the following clauses.

B.4.2 Mapping of Repetition-Period

If the PWS-IWF receives a Write-Replace-Warning Request message from the CBC which contains the Extended Repetition-Period IE then the PWS-IWF shall map the Extended Repetition-Period IE onto the Repetition-Period NG-RAN IE in the Write-Replace-Warning Request message towards the AMF and shall ignore the Repetition-Period IE that is received from the CBC.