Section: 5.2.5.4 Npcf_SMPolicyControl service 5.2.5.4.1 General
Content: Service description: NF Service Consumer, e.g. SMF, can create and manage a SM Policy Association in the PCF through which the NF Service Consumer receives policy information for a PDU Session. As part of this service, the PCF may provide the NF Service Consumer, e.g. SMF, with policy information for the PDU Session that may contain: - PDU Session related policy information as defined in clause 6.4 of TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [20]. - PCC rule information as defined in clause 6.3 of TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [20]. - Policy Control Request Trigger information i.e. a set of Policy Control Request Trigger(s) as defined in clause 6.1.3.5 of TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [20]. At PDU Session establishment the NF Service Consumer, e.g. SMF, requests the creation of a corresponding SM Policy Association with the PCF (Npcf_SMPolicyControl_Create) and provides relevant parameters about the PDU Session to the PCF. When the PCF has created the SM Policy Association, the PCF may provide policy information for the PDU Session in the response. When a Policy Control Request Trigger condition is met the NF Service Consumer, e.g. SMF requests the update(Npcf_SMPolicyControl_Update) of the SM Policy Association by providing information on the condition(s) that have been met as defined in clause 6.1.3.5 of TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [20]. The PCF may provide updated policy information for the PDU Session to the NF Service Consumer in the response. The PCF may at any time provide updated policy information for the (Npcf_SMPolicyControl_UpdateNotify). At PDU Session Release the NF Service Consumer, e.g. SMF requests the deletion of the corresponding SM Policy Association (Npcf_SMPolicyControl_Delete).