Content for TS 38.305 Word version: 18.3.0

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6.7 Signalling between UEs 6.7.1 Protocol Layering 6.7.2 SLPP PDU Transfer
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6.7 Signalling between UEs |R18| p. 42

6.7.1 Protocol Layering p. 42

Figure 6.7.1-1 shows the protocol layering used to support transfer of SLPP messages between UEs. The SLPP PDU is carried using "Non-IP" PDCP SDU type for V2X capable UEs as defined in clause 6.1.1 of TS 23.287, and "Unstructured" PDCP SDU type for 5G ProSe capable UEs as defined in clause 6.1.2.2 of TS 23.304.

Reproduction of 3GPP TS 38.305, Fig. 6.7.1-1: Protocol Layering for UE-to-UE Signalling

Figure 6.7.1-1: Protocol Layering for UE-to-UE Signalling

6.7.2 SLPP PDU Transfer p. 42

Figure 6.7.2-1 shows the general transfer of an SLPP PDU between UEs.

Reproduction of 3GPP TS 38.305, Fig. 6.7.2-1: SLPP PDU transfer between UEs

Figure 6.7.2-1: SLPP PDU transfer between UEs

Step 1.

The TX UE determines to send an SLPP message to the RX UE as part of some SLPP positioning activity (e.g., to instigate a SLPP procedure or in response to a previously received SLPP message). The SLPP layer in the TX UE determines the SLPP PDU and the application layer ID for the peer UE.

Step 2.

The TX UE establishes a unicast link with the peer UE using the application layer ID received from step 1, if not already established, as specified in TS 23.287 for V2X capable UEs and TS 23.304 for ProSe capable UEs.

Step 3.

The TX UE determines the transport configurations for the SLPP PDU.

For V2X capable UEs, policies and parameters defined in clause 5.1.2.1 of TS 23.287 are used to determine the corresponding transport configurations for the SLPP PDU.

For ProSe capable UEs, policies and parameters defined in clause 5.1.3.1 of TS 23.304 are used to determine the corresponding transport configurations for the SLPP PDU.

Step 4.

The SLPP PDU is transmitted via the established unicast link according to the procedures for V2X communication over PC5 reference point defined in TS 23.287 or according to the procedures for 5G ProSe direct communication defined in TS 23.304.