7.2.9 Data transmission over 5G ProSe direct link

24.5543GPPProximity-services (ProSe) in 5G System (5GS) protocol aspectsRelease 17Stage 3TS

7.2.9.1 Transmission

When receiving user data from upper layers to be sent over 5G ProSe direct link to a specific UE, the transmitting UE shall determine the 5G ProSe direct link context corresponding to the application layer ID and then shall tag each outgoing protocol data unit with the following information before passing it to the lower layers for transmission:

a) a layer-3 protocol data unit type (see 3GPP TS 38.323 [16]) set to:

1) IP, if the ProSe message contains IP data;

2) Ethernet, if the ProSe message contains Ethernet data; or

3) Unstructured, if the ProSe message contains Unstructured data;

b) the PC5 link identifier associated with the 5G ProSe direct link context;

c) optionally, the source layer-2 ID set to the source layer-2 ID associated with the 5G ProSe direct link context;

d) optionally, the destination layer-2 ID set to the destination layer-2 ID associated with the 5G ProSe direct link context; and

e) the PQFI set to the value corresponding to the ProSe identifier and the optional ProSe application requirements according to the mapping rules specified in clause 5.2.4.

If the 5G ProSe direct link is for direct communication between the 5G ProSe remote UE and the 5G ProSe UE-to-network relay UE, the association of the ProSe application on the PC5 QoS flow over the 5G ProSe direct link is performed as specified in clause 8.2.6.

7.2.9.2 Procedure for UE to use provisioned radio resources for ProSe communication over PC5

The procedures described for using NR-PC5 in clause 7.3.2.3 apply.