Limitations

This feature has the following limitations:

  • If you have enabled the PCC Rule level monitoring, then by default this monitoring gets linked with the URR of the refUmData that is associated with the PCC rule and Session level URR, if exists. The linking exists until PCF excludes it from the session level monitoring in "exUsagePccRuleId".

  • While the usage monitoring is in progress, any update of parameters from PCF for a Session or PCC rule without refUmData implies disabling or removal of usage monitoring for that rule. This rule must always include the refUmData even if no change exists.

  • SMF doesn't honor the usage report received from UPF after SMF notifies the usage report to PCF and PCF responds with 204—No Content (PCF disables the usage monitoring). In this case, SMF notifies only the UPF with the remove URR for the disabled UmId and locally discards any received usage report.

  • By default, SMF links the URR, if it exists, of the Session level to all the active static rules as part of the session. As no URR information exchange happens for static rules between SMF and UPF, the UPF is responsible to monitor the static rules data usage as part of the PDU and Session level monitoring. Then, UPF sends the response to SMF through the Usage report.