TS29.244-g30 5.6.3 Modifying the Rules of an Existing PFCP Session

5.6.3 Modifying the Rules of an Existing PFCP Session

The following principles shall apply, unless specified otherwise in the specification.

When modifying an existing PFCP session, the CP function shall only provide in the PFCP Request message the requested changes compared to what was previously provisioned in the UP function for this PFCP session, i.e. the CP function shall:

- include IEs which needs to be newly provisioned in the UP function;

- include IEs which need to be provisioned with a modified value;

- remove IEs which need to be removed from the set of parameters previously provisioned in the UP function, as further specified below.

The CP function shall remove IEs which needs to be removed by either:

- removing the entire Rule if no other parameter of that rule needs to remain provisioned in the UP function, e.g. by including the Remove URR IE in the PFCP Session Modification Request; or

- updating the Rule including the IEs to be removed with a null length, e.g. by including the Update URR IE in the PFCP Session Modification Request with the IE(s) to be removed with a null length.

The CP function shall set a URR ID and/or QER ID with a length "0" in the Update PDR IE within PFCP Session Modification Request, to request the UP function to stop applying the URRs and/or QERs for this PDR.

Upon receipt of a PFCP Request which modifies an existing PFCP session, the UP function shall add, update or remove the parameters as instructed by the CP function, as defined above, and shall keep unchanged the set of parameters previously provisioned in the UP function which are neither modified nor removed.