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Content for  TS 23.256  Word version:  19.0.0

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5.2.5.4 USS initiated C2 pairing policy configuration  5.2.5.4.1 USS initiated C2 pairing policy configuration in 5GS  5.2.5.4.2 USS initiated C2 pairing policy configuration in EPS 
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5.2.5.4  USS initiated C2 pairing policy configuration  p. 52

5.2.5.4.1  USS initiated C2 pairing policy configuration in 5GS  p. 52
The USS initiated C2 pairing policy configuration Figure 5.2.5.4.1-1.
Reproduction of 3GPP TS 23.256, Fig. 5.2.5.4.1-1: USS initiated C2 pairing policy configuration in 5GS
Figure 5.2.5.4.1-1: USS initiated C2 pairing policy configuration in 5GS
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Step 0.
The UAV is registered in the network and a PDU session is established as specified in clause 5.2.3.2.
Step 1.
The USS initiates the PDU Session modification by invoking the Nnef_AFSessionWithQoS_Create request including USS Identity/AF Identifier, UAV-UAVC Pairing info/Flow description(s), QoS reference. The UAV-UAVC Pairing info/Flow description(s) includes the UAV-C IP address. See step 1 in clause 4.15.6.6 of TS 23.502: Setting up an AF session with required QoS.
Step 2.
UAS NF/NEF authorizes the request from the USS followed by interacting with PCF triggering a Npcf_PolicyAuthorization_Create request and provides relevant parameters to the PCF.
PCF determines whether the request is authorized and if the requested QoS is allowed. PCF informs UAS NF/NEF if the request is accepted by invoking Npcf_PolicyAuthorization_Create response. See steps 2 - 4 in Figure 4.15.6.6-1 of TS 23.502.
Step 3.
UAS NF/NEF sends a Nnef_AFsessionWithQoS_Create response message (Transaction Reference ID, Result) to the USS. Result indicates whether the request is granted or not. See step 5 in Figure 4.15.6.6-1 of TS 23.502.
Step 4.
If the PCF determines that the SMF needs updated policy information, the PCF issues a Npcf_SMPolicyControl_UpdateNotify request with updated policy information. The updated policy information includes the UAV-C IP address. See steps 3 - 5 in Figure 4.16.5.2-1 of TS 23.502.
Step 5.
The PDU Session Modification continues and completes as in steps 2a - 13 in Figure 4.3.3.2-1 of TS 23.502, UE or network requested PDU Session Modification (for non-roaming and roaming with local breakout). Based on the updated policy information received, the SMF determines and provides N4 rules to enable communication between UAV and UAV-C, e.g. Packet Detection Rules, Forwarding Action Rules.
Step 6-7.
[Optional] The PCF sends Npcf_PolicyAuthorization_Notify message to the UAS NF/NEF when the modification of the transmission resources corresponding to the QoS update succeeded or failed. The UAS NF/NEF transfers this information to the USS by sending Nnef_AFSessionWithQoS_Notify message. See steps 6 and 7 in Figure 4.15.6.6-1 of TS 23.502.
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5.2.5.4.2  USS initiated C2 pairing policy configuration in EPS  p. 53
The USS initiated C2 pairing policy configuration in EPS Figure 5.2.5.4.2-1.
Reproduction of 3GPP TS 23.256, Fig. 5.2.5.4.2-1: USS initiated C2 pairing policy configuration in EPS
Figure 5.2.5.4.2-1: USS initiated C2 pairing policy configuration in EPS
Up
Step 0.
The UAV is registered in the network and a PDN Connection is established as specified in clause 5.2.3.3.
Step 1.
The USS initiates the PDN Connection modification by invoking the Nnef_AFSessionWithQoS_Create request including USS Identity/AF Identifier, Transaction Reference ID, UAV-UAVC Pairing info/Flow description(s), QoS reference. The UAV-UAVC Pairing info/Flow description(s) includes the UAV-C IP address. See step 1 in clause 4.15.6.6 of TS 23.502: Setting up an AF session with required QoS.
Step 2.
UAS NF/NEF authorizes the request from the USS followed by interacting with PCF triggering a Npcf_PolicyAuthorization_Create request and provides relevant parameters to the PCF.
PCF determines whether the request is authorized and if the requested QoS is allowed. PCF informs UAS NF/NEF if the request is accepted by invoking Npcf_PolicyAuthorization_Create response. See steps 2 - 4 in Figure 4.15.6.6-1 of TS 23.502.
Step 3.
UAS NF/NEF sends a Nnef_AFsessionWithQoS_Create response message (Transaction Reference ID, Result) to the USS. Result indicates whether the request is granted or not. See step 5 in Figure 4.15.6.6-1 of TS 23.502.
Step 4.
If the PCF determines that the SMF+PGW-C needs updated policy information, the PCF issues a Npcf_SMPolicyControl_UpdateNotify request with updated policy information. The updated policy information includes the UAV-C IP address. See steps 3 - 5 in Figure 4.16.5.2-1 of TS 23.502.
Step 5.
Based on the updated policy information received, the SMF+PGW-C determines and provides N4 rules to enable communication between UAV and UAV-C, e.g. Packet Detection Rules, Forwarding Action Rules.
Step 6.
[Conditional] If QoS needs to be updated: Based on the updated policy information received, the SMF+PGW-C determines N4 rules for QoS update and provides to the PGW-U.
Based on the updated policy information received, the SMF+PGW-C invokes the PDN GW initiated bearer modification with bearer QoS update procedure (clause 5.4.2.1 of TS 23.401) by sending Update Bearer Request message to the SGW. Steps 2 - 11 in Figure 5.4.2.1-1 of TS 23.401 are executed to update QoS in the UE and the RAN.
Step 7-8.
[Optional] The PCF sends Npcf_PolicyAuthorization_Notify message to the UAS NF/NEF when the modification of the transmission resources corresponding to the QoS update succeeded or failed. The UAS NF/NEF transfers this information to the USS by sending Nnef_AFSessionWithQoS_Notify message. See steps 6 and 7 in Figure 4.15.6.6-1 of TS 23.502.
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5.2.6  Void

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