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Content for  TS 23.558  Word version:  17.4.0

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8.8.4  Information flowsp. 137

8.8.4.1  Generalp. 137

Void

8.8.4.2  EAS discovery requestp. 137

Table 8.5.3.2-1 describes information elements for the EAS discovery request from the EAS to the EES and from the S-EES to the T-EES. Table 8.5.3.2-2 provides further detail about the EAS Discovery Filter information element.

8.8.4.3  EAS discovery responsep. 137

The information elements specified in the Table 8.5.3.3-1 is used for the EAS discovery response sent from the EES to the EAS with the following differences:
  • The EAS available resources (e.g. memory) indicates the maximum resources available for the AC(s) connected to the S-EAS.

8.8.4.4  ACR requestp. 137

Table 8.8.4.4-1 describes information elements for the ACR request sent either from the EEC to the S-EES or T-EES, or by the S-EAS to the S-EES.
Information element Status Description
Requestor IdentifierMUnique identifier of the requestor (i.e. EECID or EASID).
Security credentialsMSecurity credentials resulting from a successful authorization for the edge computing service.
EASIDOIdentifier of the EAS
UE identifierMThe identifier of the UE (i.e. GPSI).
ACIDOThe identifier of the AC.
ACR action (NOTE 3)MIndicates the ACR action (ACR initiation or ACR determination)
ACR initiation data (NOTE 2)OACR initiation IEs to be included in an ACR request message when ACR action indicates it is ACR initiation request.
> T-EAS EndpointMEndpoint information (e.g. URI, FQDN, IP 3-tuple) of the T-EAS.
> Previous T-EAS Endpoint (NOTE 7)OEndpoint information (e.g. URI, FQDN, IP 3-tuple) of the T-EAS of the previous ACR.
> DNAI of the T-EASODNAI information associated with the T-EAS.
> N6 Traffic Routing requirementsOThe N6 traffic routing information and/or routing profile ID corresponding to the T-EAS DNAI.
> EAS notification indicationMIndicates whether to notify the EAS about the need of ACR.
> Previous EAS notification indication (NOTE 7)OIndicates whether to notify the EAS about the cancellation of a previous ACR.
> S-EAS endpoint (NOTE 1)OEndpoint information of the S-EAS
> EEC context relocation detailsOInformation required for EEC context relocation using the EEC context push or EEC context pull mechanisms.
>> EEC Context ID (NOTE 5)OIdentifier of the EEC Context
>> S-EES ID (NOTE 5)OIdentifier of the EES that provided EEC context ID.
>> S-EES endpoint (NOTE 5)OThe endpoint address (e.g. URI, IP address) of the EES that provided EEC context ID.
>> T-EES ID (NOTE 6)OIdentifier of the T-EES.
>> T-EES endpoint (NOTE 6)OThe endpoint address (e.g. URI, IP address) of the T-EES.
ACR determination data (NOTE 2)OACR determination IEs to be included in an ACR request message when ACR action indicates it is ACR determination request.
> S-EAS endpointMEndpoint information of the S-EAS
NOTE 1:
This IE shall be present if the EAS notification indication or previous EAS notification indication indicates that the EAS needs to be informed.
NOTE 2:
Either ACR initiation or ACR determination shall be included corresponding to the ACR action.
NOTE 3:
This IE shall indicate ACR determination if the request originates from the S-EAS.
NOTE 4:
Void
NOTE 5:
This IE may be present only if the request originates from the EEC towards the T-EES.
NOTE 6:
This IE may be present only if the request originates from the EEC towards the S-EES.
NOTE 7:
These IEs shall be present when the EEC re-sends the ACR request as described in clause 8.8.1.3 to indicate a previous ACR is to be cancelled.
Up

8.8.4.5  ACR responsep. 138

Table 8.8.4.5-1 describes the information elements for the ACR response sent either from the S-EES to the EEC or S-EAS, or by the T-EES to the EEC.
Information element Status Description
Successful response (NOTE)OIndicates that the ACR request was successful.
Failure response (NOTE)OIndicates that the ACR request failed.
> CauseOIndicates the cause of ACR request failure
NOTE:
One of these IEs shall be present in the message.
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8.8.4.6  Retrieve EES requestp. 139

Table 8.8.4.6-1 describes the information elements to retrieve T-EES information from the ECS.
Information element Status Description
EESIDMUnique identifier of the EES.
Security credentialsMSecurity credentials resulting from a successful authorization for the edge computing service.
EASIDMThe EASID.
Target DNAIOThe target DNAI information which can be associated with potential T-EES(s) and/or T-EAS(s).
UE IdentifierOThe identifier of the UE (i.e. GPSI or identity token)
UE locationOThe location information of the UE. The UE location is described in clause 7.3.2.
Up

8.8.4.7  Retrieve EES responsep. 139

The information elements specified in the Table 8.3.3.3.3-1 is used as response for T-EES information retrieval.

8.8.4.8  ACR information subscription requestp. 139

Table 8.8.4.8-1 describes the information elements for ACR information subscription request from the EEC to the EES.
Information element Status Description
EECIDMUnique identifier of the EEC.
UE IdentifierOThe identifier of the UE (i.e. GPSI or identity token)
Security credentialsMSecurity credentials resulting from a successful authorization for the edge computing service.
EASID(s)MThe identifier of the EAS(s)
ACID(s)O (NOTE)The identifier of the AC(s)
Event ID(s)MEvent ID:
  • Target information notification
  • ACR complete
Notification target addressMNotification target address
Proposed expiration timeOProposed expiration time for the subscription
NOTE:
If ACID(s) IE is not included, it implies that the subscription corresponds to all ACs that can be served by the EAS(s) included the this message.
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8.8.4.9  ACR information subscription responsep. 139

Table 8.8.4.9-1 describes the information elements for ACR information subscription response from the EES to the EEC.
Information element Status Description
Successful responseOIndicates that the subscription request was successful.
> Subscription IDMSubscription identifier corresponding to the subscription.
> Expiration timeOIndicates the expiration time of the subscription. To maintain an active subscription, a subscription update is required before the expiration time.
Failure responseOIndicates that the subscription request failed.
> CauseOIndicates the cause of subscription request failure
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8.8.4.10  ACR information notificationp. 140

Table 8.8.4.10-1 describes the information elements for ACR information notification from the EES to the EEC.
Information element Status Description
Subscription IDMSubscription identifier corresponding to the subscription stored in the EES for the request
EASIDMThe identifier of the EAS
ACIDOThe identifier of the AC corresponding to the Selected target EAS
Event IDMEither Target information notification or ACR complete
Target information (NOTE 1)ODetails of the selected T-EAS and the T-EES.
> T-EAS informationM Details of the selected T-EAS as described in 'Discovered EAS' IE of Table 8.5.3.3-1.
> T-EES information (NOTE 4)O Details of the selected T-EES as described in 'EDN configuration information' IE of Table 8.3.3.3.3-1.
ACR complete event information (NOTE 2)ODetails of a completed ACR and its result.
Result of ACR (NOTE 2)MIndicates whether the ACR is successful or failure
> T-EAS endpointMEndpoint address of the T-EAS to which an ACR has been performed.
EEC Context Relocation status (NOTE 5)OIndicates whether the EEC context relocation was successful or not.
> Registration Id (see NOTE 6)OIdentifier of the registration for the EEC.
> Expiration Time (see NOTE 6)OIndicates the expiration time of the registration.
Cause information (see NOTE 3)OIndicates the cause information for the failure
NOTE 1:
This IE shall be included when Event ID indicates 'Target information notification' event
NOTE 2:
This IE shall be included when Event ID indicates 'ACR complete' event
NOTE 3:
This IE shall be included when the Result of ACR indicates failure.
NOTE 4:
This IE shall be included if the selected T-EES is different from the S-EES. Otherwise, it may be skipped.
NOTE 5:
This IE shall be included when Event ID indicates 'ACR complete' event and EEC context relocation was attempted.
NOTE 6:
This IE shall be included if S-EES has received it in EEC Context Push response.
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8.8.4.11  ACR information subscription update requestp. 140

Table 8.8.4.11-1 describes the information elements for ACR information subscription update request from the EEC to the EES.
Information element Status Description
Subscription IDMSubscription identifier corresponding to the subscription to be updated
Security credentialsMSecurity credentials resulting from a successful authorization for the edge computing service.
EASID(s)OThe identifier of the EAS(s)
Event ID(s)OEvent ID:
  • Target information notification
  • ACR complete
Notification target addressONotification target address
Proposed expiration timeOProposed expiration time for the subscription
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8.8.4.12  ACR information subscription update responsep. 140

Table 8.8.4.12-1 describes the information elements for ACR information subscription update response from the EES to the EEC.
Information element Status Description
Successful responseOIndicates that the subscription request was successful.
> Expiration timeOIndicates the expiration time of the subscription. To maintain an active subscription, a subscription update is required before the expiration time.
Failure responseOIndicates that the subscription request failed.
> CauseOIndicates the cause of subscription request failure
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8.8.4.13  ACR information unsubscribe requestp. 141

Table 8.8.4.13-1 describes the information elements for ACR information subscription unsubscribe request from the EEC to the EES.
Information element Status Description
Subscription IDMSubscription identifier corresponding to the subscription to be updated
Security credentialsMSecurity credentials resulting from a successful authorization for the edge computing service.
Up

8.8.4.14  ACR information unsubscribe responsep. 141

Table 8.8.4.14-1 describes the information elements for ACR information unsubscribe response from the EES to the EEC.
Information element Status Description
Successful responseOIndicates that the subscription request was successful.
> Expiration timeOIndicates the expiration time of the subscription. To maintain an active subscription, a subscription update is required before the expiration time.
Failure responseOIndicates that the subscription request failed.
> CauseOIndicates the cause of subscription request failure
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8.8.4.15  EELManagedACR service requestp. 141

Table 8.8.4.15-1 describes information elements for the EELManagedACR service request from the Edge Application Server to the Edge Enabler Server.
Information element Status Description
UE identifierMIdentifies the UE for which ACR is requested
EAS characteristics for ACRM Set of characteristics to determine required Edge Application Servers, as detailed in Table 8.5.3.2-2.
Security credentialsMSecurity credentials of the source Edge Application Server
Address for Application Context storageOThe address information from where the Application Context can be accessed for ACT.
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8.8.4.16  EELManagedACR service responsep. 142

Table 8.8.4.16-1 describes information elements for the EELManagedACR service response from the Edge Enabler Server to the Edge Application Server.
Information element Status Description
Successful responseOIndicates that the ACR request was successful.
> Address for Application Context storage (NOTE)OThe address information from where the Application Context can be accessed for ACT.
Failure responseOIndicates that the EELManagedACR request failed.
> CauseOIndicates the cause of request failure
NOTE:
This IE is included if "Address for Application Context storage" IE as specified in Table 8.8.4.15-1 is not included in ACR service request.
Up

8.8.4.17  Selected target EAS declaration requestp. 142

Table 8.8.4.17-1 describes information elements for the selected target EAS declaration request sent from the S-EAS to the S-EES.
Information element Status Description
UE IDMThe identifier of the UE.
Security credentialsMSecurity credentials.
Selected EAS IDMSelected EAS identifier.
ACIDOThe identifier of the AC
Selected EAS EndpointMEndpoint of the selected EAS.
Up

8.8.4.18  Selected target EAS declaration responsep. 142

Table 8.8.4.18-1 describes information elements for the Selected target EAS declaration response sent from the S-EES to the S-EAS.
Information element Status Description
Successful response (NOTE)OIndicates that the request was successful.
Failure response (NOTE)OIndicates that the request failed.
> CauseOIndicates the failure cause.
NOTE:
One of these IEs shall be present in the message.
Up

8.8.4.19  ACR status update requestp. 142

Table 8.8.4.19-1 describes the information elements for the ACR status update request from EAS to EES.
Information element Status Description
EASIDMThe identifier of the EAS providing the update
Security credentialsMSecurity credentials of the EAS
ACIDOThe identifier of the AC
ACT result (NOTE 1, NOTE 3)OIndicates whether the ACT was successful or failed.
> UEIDMThe identifier of the UE
> EAS endpointMEndpoint address of the other EAS to or from which the ACT has been performed.
List of EDGE-3 subscription ID(s) (NOTE 2, NOTE 3)OA list of the EDGE-3 subscription identifiers.
Notification Target Address for EDGE-3 subscription (NOTE 2, NOTE 3)ONotification Target Address of the EAS where the notification is to be sent by the EES for EDGE-3 subscription.
NOTE 1:
This IE may be included by the S-EAS and T-EAS. In case of EELManagedACR, this IE is not included by the T-EAS.
NOTE 2:
This IE may be included only by the T-EAS.
NOTE 3:
At least one of these IEs shall be present in the message.
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8.8.4.20  ACR status update responsep. 143

Table 8.8.4.20-1 describes the information elements for the ACR status update response from EES to EAS.
Information element Status Description
Successful response (NOTE)OIndicates that the request was successful.
> EDGE-3 subscription initialization resultOThe IE indicates if the EDGE-3 subscriptions were initialized successfully or if initialization failed.
> List of updated EDGE-3 subscription ID(s)OIf the EDGE-3 subscription initialization result is successful, the EES provides the updated subscription identifier(s). The absence of an identifier implies no change for the subscription identifier.
Failure response (NOTE)OIndicates that the request failed
> CauseOIndicates the cause of request failure
NOTE:
One of these IEs shall be present in the message.
Up

8.8.4.21  ACT status subscription requestp. 143

Table 8.8.4.21-1 describes the information elements for the ACT status subscription request from EAS to EES.
Information element Status Description
EASIDMThe identifier of the EAS providing the update
Security credentialsMSecurity credentials of the EAS
Notification Target AddressMNotification Target Address of the EAS where the notification is to be sent by the EES
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8.8.4.22  ACT status subscription responsep. 143

Table 8.8.4.22-1 describes the information elements for the ACT status subscription response from EES to EAS.
Information element Status Description
Successful responseOIndicates that the request was successful.
> Subscription IDOIdentifier of the subscription
Failure responseOIndicates that the request failed
> CauseOIndicates the cause of request failure
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8.8.4.23  ACT status notificationp. 144

Table 8.8.4.23-1 describes the information elements for an ACT status notification from the EES to the EAS.
Information element Status Description
Subscription IDMSubscription identifier corresponding to the subscription stored in the EES for the request
ACT statusMStatus of the ACT between S-EES and the T-EES
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8.8.5  APIsp. 144

8.8.5.1  Generalp. 144

Table 8.8.5.1-1 illustrates the APIs for ACR.
API Name API Operations Operation Semantics Consumer(s)
Eees_TargetEASDiscoveryRequestRequest/ResponseEAS, EES
Eees_SelectedTargetEASDeclareRequest/ResponseEAS
Eecs_TargetEESDiscoveryRequestRequest/ResponseEES
Eees_AppContextRelocationRequestRequest/ResponseEEC, EAS
Eees_ACREventsSubscribeSubscribe/NotifyEEC
Notify
UpdateSubscription
Unsubscribe
Eees_EELManagedACRRequestRequest/ResponseEAS
SubscribeSubscribe/NotifyEAS
Notify
Eees_ACRStatusUpdateRequestRequest/ResponseEAS
Up

8.8.5.2  Eees_TargetEASDiscovery APIp. 144

8.8.5.2.1  Generalp. 144
This clause describes the Eees_TargetEASDiscovery API and its operations.
8.8.5.2.2  Eees_TargetEASDiscovery_Request operationp. 144
API operation name:
Eees_TargetEASDiscovery_Request
Description:
The consumer requests for the T-EAS information from the EES.
Inputs:
Outputs:
See clause 8.8.3.2 for details of usage of this operation.

8.8.5.3  Eees_AppContextRelocation APIp. 145

8.8.5.3.1  Generalp. 145
This clause describes the Eees_AppContextRelocation API and its operations.
8.8.5.3.2  Eees_AppContextRelocation_Request operationp. 145
API operation name:
Eees_AppContextRelocation_Request
Description:
The EEC or the EAS requests to start the ACR launching procedure.
Inputs:
Outputs:
See clause 8.8.3.4 for details of usage of this operation.

8.8.5.4  Eecs_TargetEESDiscovery APIp. 145

8.8.5.4.1  Generalp. 145
This clause describes the Eecs_TargetEESDiscovery API and its operations.
8.8.5.4.2  Eecs_TargetEESDiscovery_Request operationp. 145
API operation name:
Eecs_TargetEESDiscovery_Request
Description:
The consumer requests for the T-EES information from the ECS.
Inputs:
Outputs:
See clause 8.8.3.3 for details of usage of this operation.

8.8.5.5  Eees_ACREvents APIp. 145

8.8.5.5.1  Generalp. 145
This clause describes the Eees_ACREvents API and its operations.
8.8.5.5.2  Eees_ACREvents_Subscribe operationp. 145
API operation name:
Eees_ACREvents_Subscribe
Description:
The consumer subscribes for ACR related events.
Inputs:
Outputs:
See clause 8.8.3.5.2 for details of usage of this operation.
8.8.5.5.3  Eees_ACREvents_Notify operationp. 145
API operation name:
Eees_ACREvents_Notify
Description:
The consumer is notified about ACR related events.
Inputs:
Outputs:
None.
See clause 8.8.3.5.3 for details of usage of this operation.
8.8.5.5.4  Eees_ACREvents_UpdateSubscription operationp. 146
API operation name:
Eees_ACREvents_UpdateSubscription
Description:
The consumer updates an existing subscription for ACR related events.
Inputs:
Outputs:
See clause 8.8.3.5.4 for details of usage of this operation.
8.8.5.5.5  Eees_ACREvents_Unsubscribe operationp. 146
API operation name:
Eees_ACREvents_Unsubscribe
Description:
The consumer unsubscribes for the previously subscribed ACR related events.
Inputs:
Outputs See clause 8.8.4.14.
See clause 8.8.3.5.5 for details of usage of this operation.

8.8.5.6  Eees_EELManagedACR APIp. 146

8.8.5.6.1  Generalp. 146
This clause describes the Eees_EELManagedACR API and its operations.
8.8.5.6.2  Eees_EELManagedACR_Request operationp. 146
API operation name:
Eees_EELManagedACR_Request
Description:
The consumer requests for the EELManagedACR handling by the Edge Enabler Server. To use this API, the ASP (EAS provider) and ECSP should have an agreement to use a shared Application Context storage which enables the EES to undertake the ACT in a transparent and secure way, maintaining end user privacy.
Inputs:
Outputs:
See clause 8.8.3.6.2.2 for details of usage of this operation.
8.8.5.6.3  Eees_EELManagedACR_Subscribe operationp. 146
API operation name:
Eees_EELManagedACR_Subscribe
Description:
The consumer requests for the ACT status notifications for EELManagedACR.
Inputs:
Outputs:
See clause 8.8.3.6.2.3 for details of usage of this operation.
8.8.5.6.4  Eees_EELManagedACR_Notify operationp. 146
API operation name:
Eees_EELManagedACR_Subscribe
Description:
The consumer is notified about the ACT status for EELManagedACR.
Inputs:
See clause 8.8.3.6.2.4 for details of usage of this operation.

8.8.5.7  Eees_SelectedTargetEAS APIp. 147

8.8.5.7.1  Generalp. 147
This clause describes the Eees_SelectedTargetEAS API and its operations.
8.8.5.7.2  Eees_SelectedTargetEAS_Declare operationp. 147
API operation name:
Eees_SelectedTargetEAS_Declare
Description:
The consumer declares the selected T-EAS information to the EES.
Inputs:
Outputs:
See clause 8.8.3.7 for details of usage of this operation.

8.8.5.8  Eees_ACRStatusUpdate APIp. 147

8.8.5.8.1  Generalp. 147
This clause describes the Eees_ACRStatusUpdate API and its operations.
8.8.5.8.2  Eees_ACRStatusUpdate_Request operationp. 147
API operation name:
Eees_ACRStatusUpdate_Request
Description:
The consumer updates the information related to ACR, e.g. ACT status.
Inputs:
Outputs:
See clause 8.8.3.8 for details of usage of this operation.

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