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8.6.3.4 APIs
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8.6.3.4.1 General
Table 8.6.3.4.1-1 illustrates the API for ACR management event. Table 8.6.3.4.1-1: Eees_ACRManagementEvent API API Name API Operations Operation Semantics Consumer(s) Eees_ACRManagementEvent Subscribe Subscribe/Notify EAS Notify UpdateSubscription Unsubscribe
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8.6.3.4.2 Eees_ACRManagementEvent_Subscribe operation
API operation name: Eees_ACRManagementEvent_subscribe Description: The consumer subscribes to receive an ACR management event. Inputs: See clause 8.6.3.3.2. Outputs: See clause 8.6.3.3.3. See clause 8.6.3.2.2 for details of usage of this operation.
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8.6.3.4.3 Eees_ACRManagementEvent_Notify operation
API operation name: Eees_ACRManagementEvent_Notify Description: The consumer is notified of an event by the EES. Inputs: See clause 8.6.3.3.4. Outputs: None. See clause 8.6.3.2.3 for details of usage of this operation.
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8.6.3.4.4 Eees_ACRManagementEvent_UpdateSubscription operation
API operation name: Eees_ACRManagementEvent_UpdateSubscription Description: The consumer updates an existing subscription for an ACR management event. Inputs: See clause 8.6.3.3.5. Outputs: See clause 8.6.3.3.6. See clause 8.6.3.2.4 for details of usage of this operation.
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8.6.3.4.5 Eees_ACRManagementEvent_Unsubscribe operation
API operation name: Eees_ACRManagementEvent_Unsubscribe Description: The consumer unsubscribes for the previously subscribed events. Inputs: See clause 8.6.3.3.7. Outputs: See clause 8.6.3.3.8. See clause 8.6.3.2.5 for details of usage of this operation.
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8.6.4 AC information exposure API
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8.6.4.1 General
AC information exposure enables EASs to obtain information about capabilities of ACs from the EESs. This information may facilitate communications between EASs and ACs, e.g. push notifications. The information shared is subject to access control as well as privacy and security mechanisms.
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8.6.4.2 Procedures
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8.6.4.2.1 General
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8.6.4.2.2 Subscribe
Figure 8.6.4.2.2-1 illustrates the AC information subscription procedure between the EAS and the EES. Pre-conditions: 1. The EAS is registered with the EES; and 2. The AC Profiles of the ACs on the UE are available at the EEC on the UE. Figure 8.6.4.2.2-1: AC information subscription 1. The EAS sends an AC infor...
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8.6.4.2.3 Notify
Figure 8.6.4.2.3-1 illustrates the AC information notification procedure between the EES and the EAS. Pre-conditions: 1. The EAS subscribed for AC information at the EES. Figure 8.6.4.2.3-1: AC information notification 1. The EES is triggered for AC information updates, e.g. it receives an EEC registration reques...
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8.6.4.2.4 Subscription update
Figure 8.6.4.2.4-1 illustrates the AC information subscription update procedure between the EAS and the EES. Pre-conditions: 1. The EAS has subscribed for AC information as described in clause 8.6.4.2.2. Figure 8.6.4.2.4-1: AC information subscription update 1. The EAS sends an AC information subscription update ...
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8.6.4.2.5 Unsubscribe
Figure 8.6.4.2.5-1 illustrates the AC information unsubscribe procedure between the EAS and the EES. Pre-conditions: 1. The EAS has subscribed for AC information as described in clause 8.6.4.2.2. Figure 8.6.4.2.5-1: AC information unsubscribe 1. The EAS sends an AC information unsubscribe request to the EES. 2....
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8.6.4.3 Information flows
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8.6.4.3.1 General
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8.6.4.3.2 AC information subscription request
Table 8.6.4.3.2-1 describes the information flow for an AC information subscription request from the EAS to the EES. Table 8.6.4.3.2-1: AC information subscription request Information element Status Description EASID M The identifier of the EAS Security credentials M Security credentials of the EAS Subscrip...
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8.6.4.3.3 AC information subscription response
Table 8.6.4.3.3-1 describes the information flow for the AC information subscription response from EAS to the EES. Table 8.6.4.3.3-1: AC information subscription response Information element Status Description Successful response O Indicates that the subscription request was successful. > Subscription ID M ...
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8.6.4.3.4 AC information notification
Table 8.6.4.3.4-1 describes the information flow for an AC information notification from the EES to the EAS. Table 8.6.4.3.4-1: AC information notification Information element Status Description Subscription Identifier M Subscription identifier for which the notification is generated. List of clients O List ...
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8.6.4.3.5 AC information subscription update request
Table 8.6.4.3.5-1 describes the information flow for an AC information subscription update request from the EAS to the EES. Table 8.6.4.3.5-1: AC information subscription update request Information element Status Description Security credentials M Security credentials of the EAS Subscription ID M Subscriptio...
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8.6.4.3.6 AC information subscription update response
Table 8.6.4.3.6-1 describes the information flow for the AC information subscription update response from EAS to the EES. Table 8.6.4.3.6-1: AC information subscription update response Information element Status Description Successful response O Indicates that the subscription update request was successful. Fa...
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8.6.4.3.7 AC information unsubscribe request
Table 8.6.4.3.7-1 describes the information flow for an AC information unsubscribe request from the EAS to the EES. Table 8.6.4.3.7-1: AC information unsubscribe request Information element Status Description Security credentials M Security credentials of the EAS Subscription Identifier M Subscription identif...
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8.6.4.3.8 AC information unsubscribe response
Table 8.6.4.3.8-1 describes the information flow for the AC information unsubscribe response from EAS to the EES. Table 8.6.4.3.8-1: AC information unsubscribe response Information element Status Description Successful response O Indicates that the unsubscribe request was successful. Failure response O Indic...
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8.6.4.4 APIs
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8.6.4.4.1 General
Table 8.6.4.4.1-1 illustrates the API for AC information exposure. Table 8.6.4.4.1-1: Eees_AppClientInformation API API Name API Operations Operation Semantics Consumer(s) Eees_AppClientInformation Subscribe Subscribe/Notify EAS Notify UpdateSubscription Unsubscribe
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8.6.4.4.2 Eees_AppClientInformation_Subscribe operation
API operation name: Eees_AppClientInformation_subscribe Description: The consumer subscribes to receive an AC information. Inputs: See clause 8.6.4.3.2. Outputs: See clause 8.6.4.3.3. See clause 8.6.4.2.2 for details of usage of this operation.
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8.6.4.4.3 Eees_AppClientInformation_Notify operation
API operation name: Eees_AppClientInformation_Notify Description: The consumer is notified of an event by the EES. Inputs: See clause 8.6.4.3.4. Outputs: None. See clause 8.6.4.2.3 for details of usage of this operation.
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8.6.4.4.4 Eees_AppClientInformation_UpdateSubscription operation
API operation name: Eees_AppClientInformation_UpdateSubscription Description: The consumer updates an existing subscription for AC information. Inputs: See clause 8.6.4.3.5. Outputs: See clause 8.6.4.3.6. See clause 8.6.4.2.4 for details of usage of this operation.
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8.6.4.4.5 Eees_AppClientInformation_Unsubscribe operation
API operation name: Eees_AppClientInformation_Unsubscribe Description: The consumer unsubscribes for the previously subscribed events. Inputs: See clause 8.6.4.3.7. Outputs: See clause 8.6.4.3.8. See clause 8.6.4.2.5 for details of usage of this operation.
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8.6.5 UE Identifier API
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8.6.5.1 General
EES exposes UE Identifier API to the EAS and EEC in order to provide an identifier uniquely identifying a UE. This API is used by an EAS or EEC to obtain the identifier of the UE if the EAS or EEC does not have it (e.g. hasn't already cached). This identifier, called UE ID and defined in clause 7.2.6, is used by the EA...
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8.6.5.2 Procedure
Figure 8.6.5.2-1 illustrates the interactions between the EES and the EAS or EEC. Pre-conditions: 1. The EAS or EEC is authorized to discover and to use UE Identifier API provided by the EES. 2. When the EEC is used to invoke the UE Identifier API with the UE IPv6 address as the input parameter, the UE IPv6 address...
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8.6.5.3 Information flows
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8.6.5.3.1 General
The following information flows are specified for UE Identifier API: - UE Identifier request and response.
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8.6.5.3.2 UE Identifier API request
Table 8.6.5.3.2-1 describes information elements for the UE Identifier API request from the EAS or EEC to the EES. Table 8.6.5.3.2-1: UE Identifier API request Information element Status Description Requestor Identifier (NOTE 4) O Identifier of the requestor (i.e. EASID or EECID). User information (NOTE 1) (NOT...
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8.6.5.3.3 UE Identifier API response
Table 8.6.5.3.3-1: UE Identifier API response Information element Status Description Successful response O Indicates that the UE identifier request was successful. > UE ID list M List of all the UE IDs Identifier uniquely identifying the UE(s). >> UE ID M AF-specific UE ID or Edge UE ID >> UE ID type M ...
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8.6.5.4 APIs
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8.6.5.4.1 General
Table 8.6.5.4.1-1 illustrates the APIs for UE Identifier. Table 8.6.5.4.1-1: Eees_UE_Identifier API API Name API Operations Operation Semantics Consumer(s) Eees_UEIdentifier Get Request/Response EAS, EEC
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8.6.5.4.2 Eees_UEIdentifier_Get operation
API operation name: Eees_UEIdentifier_Get Description: The consumer requests identifier of a UE. Inputs: See clause 8.6.5.3.2. Outputs: See clause 8.6.5.3.3. See clause 8.6.5.2 for details of usage of this operation.
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8.6.6 Session with QoS API
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8.6.6.1 General
The EES exposes the Session with QoS API to the EAS in order to support the setup of a data session between AC and EAS with a specific QoS and the modification of the QoS of this data session. The Session with QoS API exposed by the EES relies on the northbound Policy Authorization Service API exposed by the PCF as sp...
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8.6.6.2 Procedures
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8.6.6.2.1 General
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8.6.6.2.2 Create a session
Figure 8.6.6.2.2-1 illustrates the session with QoS create operation between the EAS and the EES. It is used to request reservation of resources for a data session between AC and EAS with a specific QoS and to subscribe to certain session with QoS event notifications. Figure 8.6.6.2.2-1: Session with QoS API: create...
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8.6.6.2.3 Update a session
Figure 8.6.6.2.3-1 illustrates the session with QoS update request operation between the EAS and the EES. It is used to request a modification of the QoS of the data session between AC and EAS. Figure 8.6.6.2.3-1: Session with QoS API: update operation 1. The EAS requests a modification of the QoS of the data sessi...
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8.6.6.2.4 Revoke a session
Figure 8.6.6.2.4-1 illustrates the session with QoS revoke operation between the EAS and the EES. It is used to revoke the data session between AC and EAS with a specific QoS and to unsubscribe to the related session with QoS event notifications. Figure 8.6.6.2.4-1: Session with QoS API: revoke operation 1. The EAS...
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8.6.6.2.5 Notify
Figure 8.6.6.2.5-1 illustrates the notify operation between the EES and the EAS for session with QoS event notifications. Figure 8.6.6.2.5-1: Session with QoS API: notify operation 1. The EES detects a user plane event associated with the established session (i.e. it receives a Policy Authorization Notify operat...
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8.6.6.3 Information flows
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8.6.6.3.1 General
The following information flows are specified for Session with QoS API: - Session with QoS create request and response; - Session with QoS update request and response; - Session with QoS revoke request and response; and - Session with QoS event notification.
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8.6.6.3.2 Session with QoS create request
Table 8.6.6.3.2-1 describes the information elements for a Session with QoS create request from the EAS to the EES. Table 8.6.6.3.2-1: Session with QoS create request Information element Status Description EASID M The identifier of the EAS Security credentials M Security credentials of the EAS UE IP addres...
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8.6.6.3.3 Session with QoS create response
Table 8.6.6.3.3-1 describes the information elements for a Session with QoS create response from the EES to the EAS. Table 8.6.6.3.3-1: Session with QoS create response Information element Status Description Successful response O Indicates that the Session with QoS create request was successful. > Context ID ...
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8.6.6.3.4 Session with QoS update request
Table 8.6.6.3.4-1 describes the information elements for a Session with QoS update request from the EAS to the EES. Table 8.6.6.3.4-1: Session with QoS update request Information element Status Description Security credentials M Security credentials of the EAS Context ID M Context identifier corresponding to...
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8.6.6.3.5 Session with QoS update response
Table 8.6.6.3.5-1 describes the information elements for a Session with QoS update response from the EES to the EAS. Table 8.6.6.3.5-1: Session with QoS update response Information element Status Description Successful response O Indicates that the Session with QoS update request was successful. Failure respon...
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8.6.6.3.6 Session with QoS revoke request
Table 8.6.6.3.6-1 describes the information elements for a Session with QoS revoke request from the EAS to the EES. Table 8.6.6.3.6-1: Session with QoS event API revoke request Information element Status Description Security credentials M Security credentials of the EAS Context ID M Context identifier corres...
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8.6.6.3.7 Session with QoS revoke response
Table 8.6.6.3.7-1 describes the information elements for a Session with QoS revoke response from the EES to the EAS. Table 8.6.6.3.7-1: Session with QoS revoke response Information element Status Description Successful response O Indicates that the Session with QoS revoke request was successful. Failure respon...
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8.6.6.3.8 Session with QoS event notification
Table 8.6.6.3.8-1 describes the information elements for a Session with QoS event notification from the EES to the EAS. Table 8.6.6.3.8-1: Session with QoS event notification Information element Status Description Context ID M Context identifier corresponding to the information stored in the EES during the init...
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8.6.6.4 APIs
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8.6.6.4.1 General
Table 8.6.6.4.1-1 illustrates the API for Session with QoS. Table 8.6.6.4.1-1: Eees_SessionWithQoS API API Name API Operations Operation Semantics Consumer(s) Eees_SessionWithQoS Create Request/Response EAS Update Revoke Notify Subscribe/Notify (NOTE) EAS NOTE: The Subscribe operation is...
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8.6.6.4.2 Eees_SessionWithQoS_Create operation
API operation name: Eees_SessionWithQoS_Create Description: The consumer requests a data session with the UE with a specific QoS and may also subscribe to certain event notifications related to the user plane traffic. Inputs: See clause 8.6.6.3.2. Outputs: See clause 8.6.6.3.3. See clause 8.6.6.2.2 for details of u...
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8.6.6.4.3 Eees_SessionWithQoS_Update operation
API operation name: Eees_SessionWithQoS_Update Description: The consumer requests a modification of the QoS of the data session with the UE and may also update event notifications related to the user plane traffic. Inputs: See clause 8.6.6.3.4. Outputs: See clause 8.6.6.3.5. See clause 8.6.6.2.3 for details of usag...
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8.6.6.4.4 Eees_SessionWithQoS_Revoke operation
API operation name: Eees_SessionWithQoS_Revoke Description: The consumer requests a revoke of the data session with QoS with the UE and unsubscribes to all related event notifications. Inputs: See clause 8.6.6.3.6. Outputs: See clause 8.6.6.3.7. See clause 8.6.6.2.4 for details of usage of this operation.
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8.6.6.4.5 Eees_SessionWithQoS_Notify operation
API operation name: Eees_SessionWithQoS_Notify Description: The consumer is notified by the EES of an event related to the user plane traffic. Inputs: See clause 8.6.6.3.8. Outputs: None. See clause 8.6.6.2.5 for details of usage of this operation.
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8.6.7 Application traffic influence trigger from EAS
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8.6.7.1 General
An EAS can explicitly request EES to influence the EAS traffic from UE(s) with necessary information. Then the EES can trigger the AF request to influence traffic routing towards the 3GPP CN for one or more UE(s) accessing the EAS.
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8.6.7.2 Procedure
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8.6.7.2.1 Procedure of application traffic influence trigger from EAS
Figure 8.6.7.2.1-1 illustrates the procedure of application traffic influence trigger from EAS. Figure 8.6.7.2.1-1: Application traffic influence trigger from EAS 1. The EAS sends an EAS traffic influence request. 2. The EES performs an authorization check to verify whether the EAS has the authorization to reques...
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8.6.7.2.2 Procedure of application traffic influence update trigger from EAS
Figure 8.6.7.2.2-1 illustrates the procedure of application traffic influence update trigger from EAS. Figure 8.6.7.2.2-1: Application traffic influence update trigger from EAS 1. The EAS sends an EAS traffic influence update request providing the corresponding transaction ID, and updated target UE Identifier(s). ...
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8.6.7.2.3 Procedure of application traffic influence cancellation trigger from EAS
Figure 8.6.7.2.3-1 illustrates the procedure of application traffic influence cancellation trigger from EAS. Figure 8.6.7.2.3-1: Application traffic influence cancellation trigger from EAS 1. The EAS sends an EAS traffic influence cancellation request providing the corresponding transaction ID. 2. The EES perform...
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8.6.7.3 Information flows
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8.6.7.3.1 General
The following information flows are specified for application traffic influence trigger from EAS: - Application traffic influence trigger from EAS request and response. - Application traffic influence update trigger from EAS request and response. - Application traffic influence cancellation trigger from EAS request ...
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8.6.7.3.2 Application traffic influence trigger from EAS request
Table 8.6.7.3.2-1: application traffic influence trigger from EAS request Information element Status Description EASID M Identifier of the EAS Security credentials M Security credentials resulting from a successful authorization for the edge computing service. Target UE Identifier(s) M Indicates the target ...
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8.6.7.3.3 Application traffic influence trigger from EAS response
Table 8.6.7.3.3-1: application traffic influence trigger from EAS response Information element Status Description Successful response O Indicates that the traffic influence was successful. >Transaction ID M Identifier of the traffic influence transaction used. Failure response O Indicates that the traffic i...
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8.6.7.3.4 Application traffic influence update trigger from EAS request
Table 8.6.7.3.4-1: application traffic influence update trigger from EAS request Information element Status Description EASID M Identifier of the EAS Security credentials M Security credentials resulting from a successful authorization for the edge computing service. Updated target UE Identifier(s) M Indica...
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8.6.7.3.5 Application traffic influence update trigger from EAS response
Table 8.6.7.3.5-1: application traffic influence update trigger from EAS response Information element Status Description Successful response O Indicates that the traffic influence was successful. Failure response O Indicates that the traffic influence has failed. > Cause O Indicates the cause of failure
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8.6.7.3.6 Application traffic influence cancellation trigger from EAS request
Table 8.6.7.3.6-1: application traffic influence cancellation trigger from EAS request Information element Status Description EASID M Identifier of the EAS Security credentials M Security credentials resulting from a successful authorization for the edge computing service. Transaction ID M Indicates the tar...
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8.6.7.3.7 Application traffic influence cancellation trigger from EAS response
Table 8.6.7.3.7-1: application traffic influence cancellation trigger from EAS response Information element Status Description Successful response O Indicates that the traffic influence request was successful. Failure response O Indicates that the traffic influence request has failed. > Cause O Indicates th...
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8.6.7.4 APIs
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8.6.7.4.1 General
Table 8.6.7.4.1-1 illustrates the APIs for application traffic influence trigger from EAS. Table 8.6.7.4.1-1: Eees_TrafficInfluenceEAS API API Name API Operations Operation Semantics Consumer(s) Eees_TrafficInfluenceEAS Create Request/Response EAS Update Request/Response EAS Cancellation Request/Resp...
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8.6.7.4.2 Eees_TrafficInfluenceEAS_Create operation
API operation name: Eees_TrafficInfluenceEAS_Create Description: The consumer requests traffic influence for EAS via EES. Inputs: See clause 8.6.7.3.2. Outputs: See clause 8.6.7.3.3. See clause 8.6.7.2.1 for details of usage of this operation.
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8.6.7.4.3 Eees_TrafficInfluenceEAS_Update operation
API operation name: Eees_TrafficInfluenceEAS_Update Description: The consumer requests to update traffic influence for EAS via EES. Inputs: See clause 8.6.7.3.4. Outputs: See clause 8.6.7.3.5. See clause 8.6.7.2.2 for details of usage of this operation.
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8.6.7.4.4 Eees_TrafficInfluenceEAS_Cancellation operation
API operation name: Eees_TrafficInfluenceEAS_Cancellation Description: The consumer requests to cancel traffic influence for EAS via EES. Inputs: See clause 8.6.7.3.6. Outputs: See clause 8.6.7.3.7. See clause 8.6.7.2.3 for details of usage of this operation.
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8.7 Network capability exposure to EAS
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8.7.1 General
The network capability exposure to EAS(s) depends on the deployment scenarios and the business relationship of the ASP/ECSP with the PLMN operator. The following mechanisms are supported: - Direct network capability exposure. - Network capability exposure via EES.
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8.7.2 Direct network capability exposure
The EAS(s) (acting as trusted or untrusted AF) may directly access the 3GPP Core Network capabilities as specified in 3GPP TS 23.501 [2] and 3GPP TS 23.682 [17]. NOTE: An EAS may use its EASID, clause 7.2.4, as the AF Identifier, 3GPP TS 23.502 [3] when invoking the capabilities of the 3GPP Core Network.
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8.7.3 Network capability exposure via EES
The EES may re-expose the network capabilities of the 3GPP core network to the EAS(s) as per the CAPIF architecture specified in 3GPP TS 23.222 [6]. Depending on the deployment models (centralized or distributed) employed, - the EES assumes the role of the API exposing function (may also acts as the API topology hid...
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8.8 Service continuity
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8.8.1 General
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8.8.1.1 High level overview
When a UE moves to a new location, different EASs can be more suitable for serving the ACs in the UE. Such transitions can result from a non-mobility event of UE also, requiring support from the enabling layer to maintain the continuity of the service. This clause describes the features that support service continuity...
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8.8.1.2 ACR with service continuity planning
Service continuity planning is an Edge Enabler Layer value-add feature of providing support for seamless service continuity, when information about planned, projected, or anticipated behaviour is available at EESs or provided by EECs. To implement this functionality an EES may utilize: - information provided by the ...
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8.8.1.3 Unused contexts handling during ACR including service continuity planning
The interval between ACT initiation and ACR status update message from EAS to EES (i.e. taking the context into use) can be significant (e.g. in the predicted case). During this interval, the following events are possible: a) The UE remains communicating with the S-EAS, e.g. the UE does not move to the service area of...
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8.8.1.4 Modification of ACR parameters during ACR for service continuity planning
During an ACR for service continuity planning, the circumstances can change which results in the changes in the parameters related to ACR. In such cases modification of the ACR will be required. For example, the EEC or EES can monitor the UE’s mobility and obtain updates in the predicted location or other ACR parameter...
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8.8.1.5 Service continuity between CAS and EAS
Service continuity between CAS and EAS can be supported with CES or without CES, corresponding to the architecture options described in clause 6.2d and 6.2c. ACR scenarios between CAS and EAS are described in clause 8.8.2A and clause 8.8.2B.
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8.8.1.6 Service continuity for EAS bundle
This clause describes solution of relocating EASs in a bundle together instead of individual relocation for AC-EAS sessions one by one. To avoid ACR being triggered for each EAS in a bundle with different initiators (e.g. EAS 1 and EAS 2 in a bundle trigger ACR simultaneously), a main EAS may be used and a main EES is ...
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8.8.2 Scenarios
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8.8.2.1 General
ACR functionality can be implemented flexibly, and may be focused either in the EEC or in the EAS/EES. The scenarios in this clause are different with regards to a) whether the EEC is involved in the detection phase and decision phase or detection and decision involve the S-EAS or S-EES only; b) whether T-EAS discov...
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8.8.2.2 Initiation by EEC using regular EAS Discovery
In this scenario, ACR is a result of the UE moving to, or the UE expecting to move to, a new location which is outside the service area of the serving EAS. The EEC is triggered as a result of the UE's movement as described in 8.8.1.1A or by an AC as described in clause 8.14.2.4. This scenario is based on Service Provi...
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8.8.2.3 EEC executed ACR via S-EES
In this scenario, the EEC is triggered as a result of the UE's movement as described in 8.8.1.1A or by an AC as described in clause 8.14.2.4. Figure 8.8.2.3-1 illustrates the EEC executing ACR via the S-EES. Pre-condition: 1. The AC at the UE already has a connection to the S-EAS; and 2. The EEC is able to communica...
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8.8.2.4 S-EAS decided ACR scenario
In this scenario, the S-EAS may detect the need of ACR locally or is notified by the S-EES (as described in clause 8.6.3.2.3) via ACR management notifications or UE location notifications as described in clause 8.8.1.1A. The S-EAS make the decision about whether to perform the ACR, and starts the ACR at a proper time. ...
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8.8.2.5 S-EES executed ACR
Figure 8.8.2.5-1 illustrates the S-EES detecting, deciding and executing ACR from the S-EAS to the T-EAS. This may include EELManagedACR by S-EES when initiated by S-EAS as per clause 8.8.3.6. The EEC or the S-EAS may also detect the ACR as illustrated in figure 8.8.2.5-1. NOTE 1: For this clause, S-EAS either support...
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8.8.2.6 EEC executed ACR via T-EES
In this scenario, the EEC is triggered as a result of the UE's movement as described in 8.8.1.1A or by an AC as described in clause 8.14.2.4. Figure 8.8.2.6-1 illustrates the EEC executing ACR via the T-EES. Pre-condition: 1. The EEC has the S-EAS information that serves the AC. Figure 8.8.2.6-1: EEC executed ACR ...