PC5-U is used for RSPP messages transport.
For V2X capable UEs, the protocol stack for RSPP transport is depicted in
Figure 6.9-1.
Legend:
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PC5-U: The SDAP/PDCP/RLC/MAC/PHY functionality is specified in TS 38.300. The PDCP SDU type "Non-IP" is specified in TS 23.287.
For ProSe capable UEs, the protocol stack for RSPP transport is depicted in
Figure 6.9-2.