Content for TS 23.433 Word version: 20.0.0

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9.12.3 Information flows 9.12.3.1 SEALDD enabled multi-modal transmission request 9.12.3.2 SEALDD enabled multi-modal transmission response 9.12.3.3 SEALDD multi-modal transmission connection establishment request 9.12.3.4 SEALDD multi-modal transmission connection establishment response 9.12.3.5 SEALDD-UUc connection request 9.12.3.6 SEALDD-UUc connection response 9.12.3.7 Inform XR transmission request 9.12.3.8 Inform XR transmission response 9.12.3.9 Trigger XR transmission request 9.12.3.10 Trigger XR transmission response 9.12.4 APIs 9.12.4.1 General 9.12.4.2 Sdd_multi-modalTransmission Request operation 9.12.4.3 Sdd_XRTransmissionConnection_Establish operation 9.12.4.4 Sdd_SEALDD-UUcConnectionEstablish operation 9.12.4.5 Sdd_XRTransmissionConnection_Trigger operation 9.12.4.6 Sdd_XRTransmissionConnection_Inform operation
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9.12.3 Information flows p. 127

9.12.3.1 SEALDD enabled multi-modal transmission request p. 127

Table 9.12.3.1-1 describes the information flow from the VAL server to the SEALDD server for requesting multi-modal transmission service.

Table 9.12.3.1-1: SEALDD enabled multi-modal transmission request

Information element	Status	Description
VAL server ID	M	Identity of the VAL server.
VAL service ID	O	Identity of the VAL service.
Identity	O	Identifier of specific UE or VAL user.
List of requested flows	M	List of the requested multi-modal flows.
> SEALDD-S Data transmission connection information for multi-modal XR	M	Address(s)/port(s) and/or URL(s) of the VAL server to receive the multi-flow packets from the SEALDD server (e.g. audio flow, tactile flow).
> QoS information	O	QoS information provided by VAL server.
> Protocol description	O	The protocol description of VAL traffic. It includes header extension information (e.g. RTP extension with PDU set), packetization indication, payload type and format (e.g. H.264/RTP, H.265/RTP, H.264, H.265). Header extension information is only applicable when payload indicates RTP.

9.12.3.2 SEALDD enabled multi-modal transmission response p. 128

Table 9.12.3.2-1 describes the information flow from the SEALDD server to the VAL server for responding to the multi-modal transmission response.

Table 9.12.3.2-1: SEALDD enabled multi-modal transmission response

Information element	Status	Description
Result	M	Success or failure.
SEALDD-S information Data transmission connection information for multi-modal service	O	Address(s)/port(s) and/or URL(s) of the SEALDD server to receive the multi-flow packets from the VAL server for application traffic transfer (e.g. audio flow, tactile flow).
Cause	O (See NOTE)	Indicates the reason for the failure.
NOTE: The IE is only present if the Result is failure.

9.12.3.3 SEALDD multi-modal transmission connection establishment request p. 128

Table 9.12.3.3-1 describes the information flow from the SEALDD client to the SEALDD server for requesting the multi-modal transmission connection establishment.

Table 9.12.3.3-1: SEALDD multi-modal transmission connection establishment request

Information element	Status	Description
SEALDD client ID	M	Identity of the SEALDD client.
Identity	O	The VAL user ID of the VAL user or VAL UE ID.
SEALDD-UU flows info	M	Information of the list of SEALDD-UU flows.
> SEALDD-UU flow ID	M	Identity of the SEALDD-UU flow.
> SEALDD traffic descriptor	M	SEALDD traffic descriptor for the flow of the SEALDD client side used to establish SEALDD multi-modal XR connection.
>> Addressing info	M	Indicates the addressing information (e.g. address, port, URL).
>> Transport layer protocol	M	Indicates the transport layer protocol.
VAL server ID	O	Identity of the VAL server.
VAL service ID	O	Identity of the VAL service.

9.12.3.4 SEALDD multi-modal transmission connection establishment response p. 129

Table 9.12.3.4-1 describes the information flow from the SEALDD server to the SEALDD client for responding to the multi-modal transmission connection establishment.

Table 9.12.3.4-1: SEALDD multi-modal transmission connection establishment response

Information element	Status	Description
Result	M	Indicates the success or failure of establishing the SEALDD connection.
Multi-modal SEALDD flow info	M	Information of the Multi-modal SEALDD-UU flow associated with the multi-modal XR connection.
> Multi-modal SEALDD flow ID	M	Identity of the Multi-modal SEALDD-UU flow associated with the multi-modal service connection.
> SEALDD-UU flows list	M	Indicates the list of SEALDD-UU flows.
>> SEALDD-UU flow ID	M	Identity of the SEALDD-UU flow.
>> SEALDD traffic descriptors	M	SEALDD traffic descriptors for the flows of the SEALDD server side used to establish SEALDD multi-modal connection.
>>> Addressing info	M	Indicates the addressing information (e.g. address, port, URL).
>>> Transport layer protocol	M	Indicates the transport layer protocol.
Protocol description	O	The protocol description of VAL traffic. It includes header extension information (e.g. RTP extension for PDU set), packetization indication, payload type and format.
> Header extension information	O	The header extension information includes the RTP header extension type and RTP header extension identity.
> Packetization indication	O	Packetization indication indicates whether the RTP header extension information is included or not.
> Payload type	O	Indicates the type of the payload (e.g., RTP, SRTP). Header extension information is only applicable when payload type indicates RTP.
> Payload format	M	Indicates the format of the payload (e.g., H.264, H.265).
Cause	O (See NOTE)	Indicates the reason for the failure.
NOTE: The IE is only present if the Result is failure.

9.12.3.5 SEALDD-UUc connection request p. 129

Table 9.12.3.5-1 describes the information flow from the SEALDD client on 3GPP UE to SEALDD client on tethered UE for SEALDD-UUc connection request.

Table 9.12.3.5-1: SEALDD-UUc connection request

Information element	Status	Description
Requestor's ID or PIN ID	M	Identity of the requestor SEALDD client on 3GPP UE, or the PIN ID of the requestor.
SEALDD-UUc data transmission connection information	M	SEALDD-UUc data transmission connection information (e.g., address/port allocated).

9.12.3.6 SEALDD-UUc connection response p. 129

Table 9.12.3.6-1 describes the information flow from the SEALDD client on 3GPP UE to SEALDD client on tethered UE for SEALDD-UUc Connection connection response.

Table 9.12.3.6-1: SEALDD-UUc connection response

Information element	Status	Description
Result	M	Success or failure.
SEALDD-UUc data transmission connection information	O	SEALDD-UUc data transmission connection information (e.g., address/port allocated).

9.12.3.7 Inform XR transmission request p. 130

Table 9.12.3.7-1 describes the information flow from the SEALDD client to the SEALDD server to inform XR transmission connection status between two UEs.

Table 9.12.3.7-1: Inform XR transmission request

Information element	Status	Description
Requestor ID	M	Identity of the requestor (i.e. SEALDD client).
VAL service ID	O	Identity of the VAL service.
Identities	M	Identifier of UEs or VAL users involved in the UE-to-UE direct communication.
Status	M	Identifies the UE-to-UE direct communication status (e.g. establishment, release).

9.12.3.8 Inform XR transmission response p. 130

Table 9.12.3.8-1 describes the information flow from the SEALDD server to the SEALDD client to acknowledge XR transmission connection status between two UEs.

Table 9.12.3.8-1: Inform XR transmission response

Information element	Status	Description
Result	M	Result of the operation.

9.12.3.9 Trigger XR transmission request p. 130

Table 9.12.3.9-1 describes the information flow from the SEALDD server to the SEALDD client to trigger XR transmission connection operation between two UEs.

Table 9.12.3.9-1: Trigger XR transmission request

Information element	Status	Description
Requestor ID	M	Identity of the requestor (i.e. SEALDD server).
VAL service ID	O	Identity of the VAL service.
Identities	M	Identifier of UEs or VAL users involved in the UE-to-UE direct communication.
Operation	M	Identifies the action for UE-to-UE direct communication (e.g. establishment, release).

9.12.3.10 Trigger XR transmission response p. 130

Table 9.12.3.10-1 describes the information flow from the SEALDD client to the SEALDD server to acknowledge XR transmission connection operation between two UEs.

Table 9.12.3.10-1: Trigger XR transmission response

Information element	Status	Description
Result	M	Result of the operation.

9.12.4 APIs p. 131

9.12.4.1 General p. 131

Table 9.12.4.1-1 illustrates the APIs exposed by SEALDD server for XR transmission.

Table 9.12.4.1-1: List of SEALDD server APIs for XR transmission

API Name	API Operations	Operation Semantics	Consumer(s)
Sdd_multi-modalTransmission	Request	Request/Response	VAL server
Sdd_XRTransmissionConnnection	Establish	Request/Response	SEALDD client
	Trigger (NOTE)	Request/Response	SEALDD server
	Inform	Request/Response	SEALDD client
Sdd_SEALDD-UUcConnection	Establish	Request/Response	SEALDD client
NOTE: The Sdd_XRTransmissionConnection_Trigger API operation is exposed by the SEALDD client.

9.12.4.2 Sdd_multi-modalTransmission Request operation p. 131

API operation name:

Sdd_multi-modalTransmission Request

Description:

The consumer requests for one time for multi-modal transmission service.

Inputs:

See clause 9.12.3.1.

Outputs:

See clause 9.12.3.2

See clause 9.12.2.1.2 and 9.12.2.2.2 for details of usage of this operation.

9.12.4.3 Sdd_XRTransmissionConnection_Establish operation p. 131

API operation name:

Sdd_XRTransmissionConnection_Establish

Description:

The consumer requests for multi-modal transmission connection establishment.

Inputs:

See clause 9.12.3.3.

Outputs:

See clause 9.12.3.4.

See clause 9.12.2.1.2 and 9.12.2.2.2 for details of usage of this operation.

9.12.4.4 Sdd_SEALDD-UUcConnectionEstablish operation p. 131

API operation name:

Sdd_SEALDD-UUcConnectionEstablish

Description:

The consumer requests for SEALDD-UUc connection establishment between the SEALDD client on 3GPP UE and tethered device.

Inputs:

See clause 9.12.3.5.

Outputs:

See clause 9.12.3.6.

See clause 9.12.2.3.4 for details of usage of this operation.

9.12.4.5 Sdd_XRTransmissionConnection_Trigger operation p. 131

API operation name:

Sdd_XRTransmissionConnection_Trigger

Description:

The consumer requests to trigger direct multi-modal transmission connection establishment between two UEs.

Inputs:

See clause 9.12.3.7.

Outputs:

See clause 9.12.3.8.

See clause 9.12.2.4 for details of usage of this operation.

9.12.4.6 Sdd_XRTransmissionConnection_Inform operation p. 132

API operation name:

Sdd_XRTransmissionConnection_Inform

Description:

The consumer informs direct multi-modal transmission connection establishment between two UEs.

Inputs:

See clause 9.12.3.9.

Outputs:

See clause 9.12.3.10.

See clause 9.12.2.4 for details of usage of this operation.