Content for TS 38.355 Word version: 18.0.0

5.1 Procedures related to capability transfer 5.1.1 General 5.1.2 Capability Transfer procedure 5.1.3 Capability Indication procedure 5.1.4 Transmission of SLPP Request Capabilities 5.1.5 Reception of SLPP Request Capabilities 5.1.6 Transmission of SLPP Provide Capabilities 5.2 Procedures related to Assistance Data Transfer 5.2.1 General 5.2.2 Assistance Data Transfer procedure 5.2.3 Assistance Data Delivery procedure 5.2.4 Transmission of SLPP Request Assistance Data 5.2.5 Reception of SLPP Request Assistance Data 5.2.6 Reception of SLPP Provide Assistance Data
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5 SLPP Procedures p. 13

5.1 Procedures related to capability transfer p. 13

5.1.1 General p. 13

The purpose of the procedures that are grouped together in this clause is to enable the transfer of capabilities from Endpoint A to Endpoint B. Capabilities in this context refer to positioning and protocol capabilities related to SLPP and the positioning methods supported by SLPP.

5.1.2 Capability Transfer procedure p. 13

The Capability Transfer procedure is shown in Figure 5.1.2-1.

Reproduction of 3GPP TS 38.355, Fig. 5.1.2-1: SLPP Capability Transfer procedure

Figure 5.1.2-1: SLPP Capability Transfer procedure

Step 1.

Endpoint B sends a RequestCapabilities message to Endpoint A. Endpoint B may indicate the types of capability needed.

Step 2.

Endpoint A responds with a ProvideCapabilities message to Endpoint B. The capabilities shall correspond to any capability types specified in step 1. This message shall include the endTransaction IE set to TRUE.

5.1.3 Capability Indication procedure p. 14

The Capability Indication procedure allows the Endpoint A to provide unsolicited capabilities to the Endpoint B and is shown in Figure 5.1.3-1.

Reproduction of 3GPP TS 38.355, Fig. 5.1.3-1: SLPP Capability Indication procedure

Figure 5.1.3-1: SLPP Capability Indication procedure

Step 1.

Endpoint A sends a ProvideCapabilities message to Endpoint B. This message shall include the endTransaction IE set to TRUE.

5.1.4 Transmission of SLPP Request Capabilities p. 14

When triggered to transmit a RequestCapabilities message, Endpoint B shall:

1 >

set the method specific RequestCapabilities IEs in accordance with the information received from upper layers.

1 >

deliver the message to lower layers for transmission.

5.1.5 Reception of SLPP Request Capabilities p. 14

Upon receiving a RequestCapabilities message, Endpoint A shall generate a ProvideCapabilities message as a response.

Endpoint A shall:

1 >

for each positioning method for which a request for capabilities is included in the message:

2 >

if Endpoint A supports this positioning method:

3 >

include the capabilities of Endpoint A for that supported positioning method in the response message;

1 >

set the SessionID IE in the response message to the same value as the SessionID IE in the received message if received;

1 >

set the SLPP-TransactionID IE in the response message to the same value as the SLPP-TransactionID IE in the received message;

1 >

deliver the response message to lower layers for transmission.

5.1.6 Transmission of SLPP Provide Capabilities p. 15

When triggered to transmit a ProvideCapabilities message, Endpoint A shall:

1 >

for each positioning method whose capabilities are to be indicated:

2 >

set the corresponding IE to include Endpoint A's capabilities;

1 >

deliver the response to lower layers for transmission.

5.2 Procedures related to Assistance Data Transfer p. 15

5.2.1 General p. 15

The purpose of the procedures that are grouped together in this clause is to enable Endpoint A to request assistance data from Endpoint B to assist in positioning, and to enable Endpoint B to transfer assistance data to Endpoint A in the absence of a request.

5.2.2 Assistance Data Transfer procedure p. 15

The Assistance Data Transfer procedure is shown in Figure 5.2.2-1.

Reproduction of 3GPP TS 38.355, Fig. 5.2.2-1: SLPP Assistance data transfer procedure

Figure 5.2.2-1: SLPP Assistance data transfer procedure

Step 1.

Endpoint A sends a RequestAssistanceData message to Endpoint B.

Step 2.

Endpoint B responds with a ProvideAssistanceData message to Endpoint A containing assistance data. The transferred assistance data should match or be a subset of the assistance data requested in step 1. Endpoint B may also provide any not requested information that it considers useful to Endpoint A. If step 3 does not occur, this message shall set the endTransaction IE to TRUE.

Step 3.

Endpoint B may transmit one or more additional ProvideAssistanceData messages to Endpoint A containing further assistance data. The transferred assistance data should match or be a subset of the assistance data requested in step 1. Endpoint B may also provide any not requested information that it considers useful to Endpoint A. The last message shall include the endTransaction IE set to TRUE.

5.2.3 Assistance Data Delivery procedure p. 16

The Assistance Data Delivery procedure allows Endpoint B to provide unsolicited assistance data to Endpoint A and is shown in Figure 5.2.3-1.

Reproduction of 3GPP TS 38.355, Fig. 5.2.3-1: SLPP Assistance data transfer procedure

Figure 5.2.3-1: SLPP Assistance data transfer procedure

Step 1.

Endpoint B sends a ProvideAssistanceData message to Endpoint A containing assistance data. If step 2 does not occur, this message shall set the endTransaction IE to TRUE.

Step 2.

Endpoint B may transmit one or more additional ProvideAssistanceData messages to Endpoint A containing additional assistance data. The last message shall include the endTransaction IE set to TRUE.

5.2.4 Transmission of SLPP Request Assistance Data p. 16

When triggered to transmit a RequestAssistanceData message, Endpoint A shall:

1 >

set the method specific RequestAssistanceData IEs in accordance with the information received from upper layers.

1 >

deliver the message to lower layers for transmission.

5.2.5 Reception of SLPP Request Assistance Data p. 16

Upon receiving a RequestAssistanceData message, Endpoint B shall generate a ProvideAssistanceData message as a response.

Endpoint B shall:

1 >

for each positioning method for which a request for assistance data is included in the message:

2 >

if Endpoint B supports this positioning method:

3 >

include the assistance data for that supported positioning method in the response message;

1 >

set the SessionID IE in the response message to the same value as the SessionID IE in the received message if received;

1 >

set the SLPP-TransactionID IE in the response message to the same value as the SLPP-TransactionID IE in the received message;

1 >

deliver the response message to lower layers for transmission.

5.2.6 Reception of SLPP Provide Assistance Data p. 16

Upon receiving a ProvideAssistanceData message, Endpoint A shall:

1 >

for each positioning method contained in the message:

2 >

deliver the related assistance data to upper layers.