Content for  TS 23.558  Word version:  20.0.0

8.8.4.1  General  p. 207

8.8.4.2  EAS discovery request  p. 207

8.8.4.3  EAS discovery response  p. 207

8.8.4.4  ACR request  p. 207

Information element	Status	Description
Requestor Identifier	M	Identifier of the requestor (i.e. EECID or EASID).
Security credentials	M	Security credentials resulting from a successful authorization for the edge computing service.
EASID	O	Identifier of the EAS.
EAS bundle information	O	EAS bundle information.
> Bundle ID (NOTE 12)	O	Bundle ID as described in clause 7.2.10.
> List of EASIDs (NOTE 12)	O	A list of the EASIDs of the EASs in the bundle.
UE identifier(s) (NOTE 13)	M	The identifier of the UE (i.e. GPSI).), or for common EAS case if the S-EAS overload occurs, a list of impacted UE identifier (i.e., GPSI list) instead.
> Predicted/Expected UE location or Expected AC Geographical Service Area (NOTE 8)	O	The predicted/expected location information of the UE. The UE location is described in clause 7.3.2 or the predicted/expected AC Geographical Service Area as described in clause 7.3.3.3.
> ACID (NOTE 10)	O	The identifier of the AC.
>> EASID	O	Identifier of the EAS.
>> EAS endpoint	M	Endpoint information of the T-EAS.
ACR action (NOTE 3)	M	Indicates the ACR action (ACR initiation, ACR determination or ACR modification).
ACR initiation data (NOTE 2)	O	ACR initiation IEs to be included in an ACR request message when ACR action indicates it is ACR initiation request.
> T-EAS Endpoint	M	Endpoint information (e.g. URI, FQDN, IP 3-tuple) of the T-EAS. In case of ACR to cloud, Endpoint information is of CAS.
> Previous T-EAS Endpoint (NOTE 7)	O	Endpoint information (e.g. URI, FQDN, IP 3-tuple) of the T-EAS of the previous ACR.
> DNAI of the T-EAS	O	DNAI information associated with the T-EAS.
> N6 Traffic Routing requirements	O	The N6 traffic routing information and/or routing profile ID corresponding to the T-EAS DNAI.
> Simultaneous EAS connectivity information	O	Indicates if simultaneous EAS connectivity is needed and the inactive time guidance for keeping connectivity towards the S-EAS.
> EAS notification indication	M	Indicates whether to notify the EAS about the need of ACR.
> Previous EAS notification indication (NOTE 7)	O	Indicates whether to notify the EAS about the cancellation of a previous ACR.
> S-EAS endpoint (NOTE 1)	O	Endpoint information of the S-EAS
> Bundled T-EAS endpoint list (NOTE 11)	O	A list of associated EAS endpoints in a EAS bundle.
> ACR parameters (NOTE 9)	O	Parameters of the ACR.
>> Prediction expiration time	O	The estimated time the UE may reach the Predicted/Expected UE location or EAS service area at the latest.
> EEC context relocation details	O	Information required for EEC context relocation using the EEC context push or EEC context pull mechanisms.
>> EEC Context ID (NOTE 5)	O	Identifier of the EEC Context
>> S-EES ID (NOTE 5)	O	Identifier of the EES that provided EEC context ID.
>> S-EES endpoint (NOTE 5)	O	The endpoint address (e.g. URI, IP address) of the EES that provided EEC context ID.
>> T-EES ID (NOTE 6)	O	Identifier of the T-EES.
>> T-EES endpoint (NOTE 6)	O	The endpoint address (e.g. URI, IP address) of the T-EES.
ACR determination data (NOTE 2)	O	ACR determination IEs to be included in an ACR request message when ACR action indicates it is ACR determination request.
> S-EAS endpoint	M	Endpoint information of the S-EAS.
> Tunnel information	O	It includes service provider ID, the endpoint address (e.g. IP address) of the tunnel server.
ACR modification data (NOTE 2)	O	ACR modification IEs to be included in an ACR request message when ACR action indicates it is ACR modification request.
> S-EAS Endpoint	M	Endpoint information (e.g. URI, FQDN, IP 3-tuple) of the S-EAS.
> T-EAS Endpoint	M	Endpoint information (e.g. URI, FQDN, IP 3-tuple) of the T-EAS.
> ACR parameters	M	ACR parameters.
>> Prediction expiration time	O	The estimated time the UE may reach the Predicted/Expected UE location or EAS service area at the latest.
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: One of the ACR initiation, ACR determination or ACR modification 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. NOTE 8: This IE may be present if the ACR procedure is for service continuity planning. If more than one UE IDs are included in the ACR request, the list of this information elements per UE ID is also included, if available. NOTE 9: This IE may be included when the ACR is decided and executed for service continuity planning for a predicted/expected UE location. NOTE 10: The IE shall be present when the action is ACR modification to identify the ACR to be modified. NOTE 11: The IE is present when the EEC informs S-EES(s) with applicable bundled T-EAS(s) information for the direct bundle EAS case or when the main S-EES informs its associated S-EES(s) with applicable bundle T-EAS(s) information for the direct bundle EAS case. NOTE 12: At least one of the IEs shall be present if EAS bundle information is provided. NOTE 13: This IE shall include at least a single UE ID. The list of UE IDs may be included only for common EAS overloaded S-EAS (see clause 8.8.2.5). If more than one UE IDs are included, the corresponding UE information elements shall be included per UE ID, if available.

8.8.4.5  ACR response  p. 209

Information element	Status	Description
Successful response (NOTE)	O	Indicates that the ACR request was successful.
Failure response (NOTE)	O	Indicates that the ACR request failed.
> Cause	O	Indicates the cause of ACR request failure
NOTE: One of these IEs shall be present in the message.

8.8.4.6  Retrieve EES request  p. 209

Information element	Status	Description
EESID	M	Identifier of the requesting EES or CES.
Security credentials	M	Security credentials resulting from a successful authorization for the edge computing service.
EASID	M	The identifier of the EAS.
Application Group ID	O	Application group identifier as defined in clause 7.2.11. Indicates to the ECS that the request is to obtain EES list for the announcement of common EAS.
Bundle ID (NOTE)	O	A bundle ID as described in clause 7.2.10.
List of EASIDs (NOTE 2)	O	List of EASIDs associated with the EAS bundle.
> Bundle type	O	Type of the EAS bundle as described in clause 7.2.10.
Target DNAI	O	The target DNAI information which can be associated with potential T-EES(s) and/or T-EAS(s).
UE Identifier	O	The identifier of the UE (i.e,. GPSI).
UE location	O	The location information of the UE. The UE location is described in clause 7.3.2.
EEC service continuity support	O	Indicates if the EEC supports service continuity or not. The IE also indicates which ACR scenarios are supported by the EEC.
Prediction expiration time	O	The estimated time the UE may reach the Predicted/Expected UE location or EAS service area at the latest.
AC service continuity support	O	Indicates if the AC supports service continuity or not. The IE also indicates which ACR scenarios are supported by the AC.
ENS indication	O	Indicates whether edge node sharing is used.
Serving MNO information	O	The serving MNO information (e.g. MNO name, PLMN ID) which is serving the subscriber.
Tunnel information	O	It includes service provider ID, the endpoint address (e.g. IP address) of the tunnel server.
NOTE: The bundle ID is provided only when bundle type indicates the proxy bundle.

8.8.4.7  Retrieve EES response  p. 210

8.8.4.8  ACR information subscription request  p. 210

Information element	Status	Description
EECID	M	Unique identifier of the EEC.
UE Identifier	O	The identifier of the UE (i.e., GPSI).
Security credentials	M	Security credentials resulting from a successful authorization for the edge computing service.
EASID(s)	M	The identifier of the EAS(s).
ACID(s)	O (NOTE)	The identifier of the AC(s).
Event ID(s)	M	Event ID: Target information notification ACR complete
Notification target address	M	Notification target address.
Proposed expiration time	O	Proposed 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).

8.8.4.9  ACR information subscription response  p. 211

Information element	Status	Description
Successful response (NOTE)	O	Indicates that the subscription request was successful.
> Subscription ID	M	Subscription identifier corresponding to the subscription.
> Expiration time	O	Indicates the expiration time of the subscription. To maintain an active subscription, a subscription update is required before the expiration time.
Failure response (NOTE)	O	Indicates that the subscription request failed.
> Cause	O	Indicates the cause of subscription request failure
NOTE: One of these IEs shall be present in the message.

8.8.4.10  ACR information notification  p. 211

Information element	Status	Description
Subscription ID	M	Subscription identifier corresponding to the subscription stored in the EES for the request
EASID	M	The identifier of the EAS
ACID	O	The identifier of the AC corresponding to the Selected target EAS
Event ID	M	Either Target information notification or ACR complete
Target information (NOTE 1)	O	Details of the selected T-EAS and the T-EES.
> T-EAS information	M	Details of the selected T-EAS as described in 'Discovered EAS' IE of Table 8.5.3.3-1 or CAS information in case of ACR to cloud.
> Bundled T-EAS information list	O	A list of T-EASs in a EAS bundle, the T-EASs are selected by the network side and details are 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.
> EDN connection information	O	EDN connection information as described in Table 8.3.3.3.3-2.
ACR complete event information (NOTE 2)	O	Details of a completed ACR and its result.
Result of ACR (NOTE 2)	M	Indicates whether the ACR is successful or failure
> T-EAS endpoint	M	Endpoint address of the T-EAS to which an ACR has been performed.
> Bundled T-EAS endpoint list	O	A list of associated EAS endpoints in a EAS bundle.
EEC Context Relocation status (NOTE 5)	O	Indicates whether the EEC context relocation was successful or not.
> Registration Id (NOTE 6)	O	Identifier of the registration for the EEC.
> Expiration Time (NOTE 6)	O	Indicates the expiration time of the registration.
Cause information (NOTE 3)	O	Indicates the cause information for the failure
Selected ACR scenario list (NOTE 6)	O	List of selected ACR scenarios.
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.

8.8.4.11  ACR information subscription update request  p. 212

Information element	Status	Description
Subscription ID	M	Subscription identifier corresponding to the subscription to be updated
Security credentials	M	Security credentials resulting from a successful authorization for the edge computing service.
EASID(s)	O	The identifier of the EAS(s)
Event ID(s)	O	Event ID: Target information notification ACR complete
Notification target address	O	Notification target address
Proposed expiration time	O	Proposed expiration time for the subscription

8.8.4.12  ACR information subscription update response  p. 213

Information element	Status	Description
Successful response (NOTE)	O	Indicates that the subscription update request was successful.
> Expiration time	O	Indicates the expiration time of the subscription. To maintain an active subscription, a subscription update is required before the expiration time.
Failure response (NOTE)	O	Indicates that the subscription request failed.
> Cause	O	Indicates the cause of subscription request failure
NOTE: One of these IEs shall be present in the message.

8.8.4.13  ACR information unsubscribe request  p. 213

Information element	Status	Description
Subscription ID	M	Subscription identifier corresponding to the subscription to be updated
Security credentials	M	Security credentials resulting from a successful authorization for the edge computing service.

8.8.4.14  ACR information unsubscribe response  p. 213

Information element	Status	Description
Successful response (NOTE)	O	Indicates that the unsubscribe request was successful.
Failure response (NOTE)	O	Indicates that the subscription request failed.
> Cause	O	Indicates the cause of subscription request failure
NOTE: One of these IEs shall be present in the message.

8.8.4.15  EELManagedACR service request  p. 213

Information element	Status	Description
UE identifier	M	Identifies the UE for which ACR is requested
EAS characteristics for ACR	M	Set of characteristics to determine required Edge Application Servers, as detailed in Table 8.5.3.2-2.
Security credentials	M	Security credentials of the source Edge Application Server
Address for Application Context storage	O	The address information from where the Application Context can be accessed for ACT.

8.8.4.16  EELManagedACR service response  p. 214

Information element	Status	Description
Successful response	O	Indicates that the ACR request was successful.
> Address for Application Context storage (NOTE)	O	The address information from where the Application Context can be accessed for ACT.
Failure response	O	Indicates that the EELManagedACR request failed.
> Cause	O	Indicates 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.

8.8.4.17  Selected target EAS declaration request  p. 214

Information element	Status	Description
UE ID	M	The identifier of the UE.
Security credentials	M	Security credentials.
Selected EAS ID	M	Selected EAS identifier.
ACID	O	The identifier of the AC
List of UE IDs	O	List of UE IDs in an Application Group.
Selected EAS Endpoint	M	Endpoint of the selected EAS. In case of ACR to cloud, Endpoint information is of CAS.
EAS bundle information	O	EAS bundle information.
> Bundle ID	O	Bundle ID as described in clause 7.2.10.
> List of EASIDs (NOTE)	O	A list of the EASIDs of the EASs in the bundle.
> T-EAS endpoint list	M	A list of associated EAS endpoints in a EAS bundle, selected by the S-EAS.
Predicted/Expected UE location or Expected AC Geographical Service Area	O	The predicted/expected location information of the UE. The UE location is described in clause 7.3.2 or the predicted/expected AC Geographical Service Area as described in clause 7.3.3.3.
NOTE: At least one of the IEs shall be present if EAS bundle information is provided.

8.8.4.18  Selected target EAS declaration response  p. 214

Information element	Status	Description
Successful response (NOTE)	O	Indicates that the request was successful.
Failure response (NOTE)	O	Indicates that the request failed.
> Cause	O	Indicates the failure cause.
NOTE: One of these IEs shall be present in the message.

8.8.4.19  ACR status update request  p. 214

Information element	Status	Description
EASID	M	The identifier of the EAS providing the update.
Security credentials	M	Security credentials of the EAS.
ACID	O	The identifier of the AC
ACT result (NOTE 1, NOTE 3)	O	Indicates whether the ACT was successful or failed.
> UEID	M	The identifier of the UE.
> List of UE IDs	O	List of UE IDs in an Application Group.
> Application Group ID	O	Application group identifier as defined in clause 7.2.11.
> EAS endpoint	M	Endpoint 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)	O	A list of the EDGE-3 subscription identifiers.
Notification Target Address for EDGE-3 subscription (NOTE 2, NOTE 3)	O	Notification 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.

8.8.4.20  ACR status update response  p. 215

Information element	Status	Description
Successful response (NOTE)	O	Indicates that the request was successful.
> EDGE-3 subscription initialization result	O	The IE indicates if the EDGE-3 subscriptions were initialized successfully or if initialization failed.
> List of updated EDGE-3 subscription ID(s)	O	If 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)	O	Indicates that the request failed
> Cause	O	Indicates the cause of request failure
NOTE: One of these IEs shall be present in the message.

8.8.4.21  ACT status subscription request  p. 215

Information element	Status	Description
EASID	M	The identifier of the EAS providing the update
Security credentials	M	Security credentials of the EAS
Notification Target Address	M	Notification Target Address of the EAS where the notification is to be sent by the EES

8.8.4.22  ACT status subscription response  p. 215

Information element	Status	Description
Successful response	O	Indicates that the request was successful.
> Subscription ID	O	Identifier of the subscription
Failure response	O	Indicates that the request failed
> Cause	O	Indicates the cause of request failure

8.8.4.23  ACT status notification  p. 216

Information element	Status	Description
Subscription ID	M	Subscription identifier corresponding to the subscription stored in the EES for the request
ACT status	M	Status of the ACT between S-EES and the T-EES

8.8.4.24  ACR parameter information request |R18|  p. 216

Information element	Status	Description
EES ID	M	Unique identifier of the requesting S-EES or CES.
EECID (NOTE 1)	M	Unique identifier of the EEC.
ACID (NOTE 1)	M	The identifier of the AC.
S-EAS Endpoint (NOTE 1)	M	Endpoint information (e.g. URI, FQDN, IP 3-tuple) of the S-EAS or CAS.
T-EAS Endpoint (NOTE 1)	M	Endpoint information (e.g. URI, FQDN, IP 3-tuple) of the T-EAS.
ACR parameters	M	ACR parameters
> Prediction expiration time	O	The estimated time the UE may reach the Predicted/Expected UE location or EAS service area at the latest.
NOTE 1: These IEs are used to identify the ACR.

8.8.4.25  ACR parameter information response |R18|  p. 216

Information element	Status	Description
Successful response (NOTE)	O	Indicates that the ACR parameter information request was successful.
Failure response (NOTE)	O	Indicates that the ACR parameter information request failed.
> Cause	O	Indicates the cause of ACR parameter information request failure.
NOTE: One of these IEs shall be present in the message.

8.8.4.26  Selected EES declaration request |R18|  p. 216

Information element	Status	Description
Security credentials	M	Security credentials resulting from a successful authorization for the edge computing service.
UE ID	M	The identifier of the UE.
Selected EES ID	M	Selected EES identifier.
Selected EES Endpoint	M	Endpoint of the selected EES.
EAS ID	M	The identifier of the EAS.
AC ID	O	The identifier of the AC.

8.8.4.27  Selected EES declaration response |R18|  p. 217

Information element	Status	Description
Successful response (NOTE)	O	Indicates that the request was successful.
Failure response (NOTE)	O	Indicates that the request failed.
> Cause	O	Indicates the failure cause.
NOTE: One of these IEs shall be present in the message.

8.8.4.28  ACR event subscription request |R19|  p. 217

Information element	Status	Description
EES ID	M	Unique identifier of the requesting EES.
Security credentials	M	Security credentials resulting from a successful authorization for the edge computing service.
Event ID(s)	M	Event ID: EDN overload
EDN information	O	EDN information which includes DNN and DNAIs. Applicable for "EDN overload" event.
Notification target address	M	Notification target address.
Proposed expiration time	O	Proposed expiration time for the subscription.

8.8.4.29  ACR event subscription response |R19|  p. 217

Information element	Status	Description
Successful response (NOTE)	O	Indicates that the subscription request was successful.
> Subscription ID	M	Subscription identifier corresponding to the subscription.
> Expiration time	O	Indicates the expiration time of the subscription. To maintain an active subscription, a subscription update is required before the expiration time.
Failure response (NOTE)	O	Indicates that the subscription request failed.
> Cause	O	Indicates the cause of subscription request failure.
NOTE: One of these IEs shall be present in the message.

8.8.4.30  ACR event notification |R19|  p. 218

Information element	Status	Description
Subscription ID	M	Subscription identifier corresponding to the subscription stored in the ECS for the request.
Event ID	M	Identifies the corresponding event.
Relocation ratio (NOTE)	O	Indicates the relocation ratio for application sessions being facilitated in the EES.
NOTE: This IE shall be included when Event ID indicates 'EDN overload' event.

8.8.4.31  ACR event subscription update request |R19|  p. 218

Information element	Status	Description
Subscription ID	M	Subscription identifier corresponding to the subscription to be updated.
Security credentials	M	Security credentials resulting from a successful authorization for the edge computing service.
Event ID(s)	O	Event ID: EDN overload
Notification target address	O	Notification target address.
Proposed expiration time	O	Proposed expiration time for the subscription.

8.8.4.32  ACR event subscription update response |R19|  p. 218

Information element	Status	Description
Successful response (NOTE)	O	Indicates that the subscription update request was successful.
> Expiration time	O	Indicates the expiration time of the subscription. To maintain an active subscription, a subscription update is required before the expiration time.
Failure response (NOTE)	O	Indicates that the subscription request failed.
> Cause	O	Indicates the cause of subscription request failure.
NOTE: One of these IEs shall be present in the message.

8.8.4.33  ACR event unsubscribe request |R19|  p. 218

Information element	Status	Description
Subscription ID	M	Subscription identifier corresponding to the subscription to be updated.
Security credentials	M	Security credentials resulting from a successful authorization for the edge computing service.

8.8.4.34  ACR event unsubscribe response |R19|  p. 219

Information element	Status	Description
Successful response (NOTE)	O	Indicates that the unsubscribe request was successful.
Failure response (NOTE)	O	Indicates that the subscription request failed.
> Cause	O	Indicates the cause of subscription request failure.
NOTE: One of these IEs shall be present in the message.