Content for TS 23.558 Word version: 19.3.0

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8.4.3 EAS Registration p. 85

8.4.3.1 General p. 85

The EAS Registration procedure allows an EAS to provide its information to an EES in order to enable its discovery.

If there is a change in the requirements or the information of an EAS, it uses the EAS registration update procedure to update the EES.

The EAS uses the EAS de-registration procedure to remove its information from the EES.

EAS registration at the EES can be time bound. So, to maintain the registration, the EAS needs to send a registration update request prior to the registration expiration time. If a registration update request is not received prior to the registration expiration time, the EES treats the EAS as implicitly de-registered.

8.4.3.2 Procedures p. 85

8.4.3.2.1 General p. 85

Following are supported for EAS registration:

EAS registration procedure;
EAS registration update procedure; and
EAS de-registration procedure.

8.4.3.2.2 EAS registration p. 86

Pre-conditions:

The EAS has been configured with an EASID;
The EAS has been configured with the address (e.g. URI) of the EES; and
Both the EAS and EES have the necessary credentials to enable communications.

Reproduction of 3GPP TS 23.558, Fig. 8.4.3.2.2-1: EAS Registration procedure

Figure 8.4.3.2.2-1: EAS Registration procedure

Step 1.

The EAS determines that registration to the EES is needed (e.g. the EAS is instantiated and started up).

Step 2.

The EAS sends an EAS registration request to the EES. The request shall include the EAS profile and may include proposed expiration time for the registration.

Step 3.

The EES performs an authorization check to verify whether the EAS has the authorization to register on the EES.

Step 4.

Upon successful authorization, the EES stores the EAS Profile for later use (e.g. for serving EAS discovery requests received from EECs, etc.) and replies to the EAS with an EAS registration response. If the request includes bundle ID, the EES stores the received information. The EES may provide an expiration time to indicate to the EAS when the registration will automatically expire. To maintain the registration, the EAS shall send a registration update request prior to the expiration time. If a registration update request is not received prior to the expiration time, the EES shall treat the EAS as implicitly de-registered.

8.4.3.2.3 EAS registration update p. 86

Pre-conditions:

The EAS has already registered with the EES.

Reproduction of 3GPP TS 23.558, Fig. 8.4.3.2.3-1: EAS registration update procedure

Figure 8.4.3.2.3-1: EAS registration update procedure

Step 1.

The EAS determines that its existing registration needs to be updated (e.g. because the EAS's status or availability schedule has changed, or EAS's registration is about to expire).

Step 2.

The EAS sends an EAS registration update request to the EES. The request shall include the registration ID and may include the EAS profile and proposed expiration time for the updated registration.

Step 3.

The EES performs an authorization check to verify whether the EAS has the authorization to update the registration on the EES.

Step 4.

Upon successful authorization, the EES updates the registered EAS Profile and replies to the EAS with an EAS registration update response. If the request includes updated bundle ID, the EES updates the stored information. The EES may provide an updated expiration time to indicate to the EAS when the updated registration will automatically expire. To maintain the registration, the EAS shall send a registration update request prior to the expiration time. If a registration update request is not received prior to the expiration time, the EES shall treat the EAS as implicitly de-registered.

8.4.3.2.4 EAS de-registration p. 87

Pre-conditions:

The EAS has already registered with the EES.

Reproduction of 3GPP TS 23.558, Fig. 8.4.3.2.4-1: EAS de-registration procedure

Figure 8.4.3.2.4-1: EAS de-registration procedure

Step 1.

The EAS determines that its existing registration needs to be terminated (e.g. because the services of the EAS are not needed anymore).

Step 2.

The EAS sends an EAS de-registration request to the EES. The request shall include the registration ID.

Step 3.

The EES performs an authorization check to verify whether the EAS has the authorization to de-register explicitly.

Step 4.

Upon successful authorization, the EES removes the registered EAS Profile and replies to the EAS with an EAS de-registration response.

8.4.3.3 Information flows p. 88

8.4.3.3.1 General p. 88

The following information flows are specified for EAS registration:

EAS registration request and response;
EAS registration update request and response; and
EAS registration de-registration request and response.

8.4.3.3.2 EAS registration request p. 88

Table 8.4.3.3.2-1 describes information elements in the EAS registration request from the EAS to the EES.

Table 8.4.3.3.2-1: EAS registration request

Information element	Status	Description
EAS Profile	M	EAS Profile as described in Table 8.2.4-1
Security credentials	M	Security credentials of the EAS.
Proposed expiration time	O	Proposed expiration time for the registration

8.4.3.3.3 EAS registration response p. 88

Table 8.4.3.3.3-1 describes information elements in the EAS registration response from the EES to the EAS.

Table 8.4.3.3.3-1: EAS registration response

Information element	Status	Description
Successful response	O	Indicates that the registration request was successful.
> Registration ID	M	Identifier of the registration.
> Expiration time	O	Indicates the expiration time of the registration. To maintain an active registration status, a registration update is required before the expiration time. If the Expiration time IE is not included, it indicates that the registration never expires.
Failure response	O	Indicates that the registration request failed.
> Cause	O	Indicates the cause of registration request failure

8.4.3.3.4 EAS registration update request p. 89

Table 8.4.3.3.4-1 describes information elements in the EAS registration update request from the EAS to the EES.

Table 8.4.3.3.4-1: EAS registration update request

Information element	Status	Description
Registration ID	M	Identifier of the registration.
Security credentials	M	Security credentials of the EAS
Updated EAS Profile (NOTE)	O	EAS Profile as described in Table 8.2.4-1 with updated information. Included only if there is an update in EAS information.
Proposed expiration time (NOTE)	O	Proposed expiration time for the registration
NOTE: At least one of the IEs is included.

8.4.3.3.5 EAS registration update response p. 89

Table 8.4.3.3.5-1 describes information elements in the EAS registration update response from the EES to the EAS.

Table 8.4.3.3.5-1: EAS registration update response

Information element	Status	Description
Successful response	O	Indicates that the registration update request was successful.
> Expiration time	O	Indicates the expiration time of the updated registration. To maintain an active registration status, a registration update is required before the expiration time. If the Expiration time IE is not included, it indicates that the updated registration never expires.
Failure response	O	Indicates that the registration update request failed.
> Cause	O	Indicates the cause of registration update request failure

8.4.3.3.6 EAS de-registration request p. 89

Table 8.4.3.3.6-1 describes information elements in the EAS de-registration request from the EAS to the EES.

Table 8.4.3.3.6-1: EAS de-registration request

Information element	Status	Description
Registration ID	M	Identifier of the registration.
Security credentials	M	Security credentials of the EAS

8.4.3.3.7 EAS de-registration response p. 90

Table 8.4.3.3.7-1 describes information elements in the EAS de-registration response from the EES to the EAS.

Table 8.4.3.3.7-1: EAS de-registration response

Information element	Status	Description
Successful response	O	Indicates that the de-registration request was successful.
Failure response	O	Indicates that the de-registration request failed.
> Cause	O	Indicates the cause of de-registration request failure