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Content for  TS 23.304  Word version:  19.1.0

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6.1.2 User Plane  6.1.2.1 General  6.1.2.2 UE - UE  6.1.2.3 5G ProSe UE-to-Network Relay  6.1.2.3.1 5G ProSe Layer-3 UE-to-Network Relay  6.1.2.3.2 5G ProSe Layer-2 UE-to-Network Relay  6.1.2.4 5G ProSe UE-to-UE Relay  6.1.2.4.1 5G ProSe Layer-2 UE-to-UE Relay  6.1.2.4.2 5G ProSe Layer-3 UE-to-UE Relay 
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6.1.2  User Plane  p. 89

6.1.2.1  General  p. 89

The user plane stack consists of protocols for data transmission via:

6.1.2.2  UE - UE  p. 89

Figure 6.1.2.2-1 depicts a user plane for NR PC5 reference point, i.e. PC5 User Plane Protocol stack.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 6.1.2.2-1: User Plane for NR PC5 reference point
Figure 6.1.2.2-1: User Plane for NR PC5 reference point
(⇒ copy of original 3GPP image)
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Legend:
  • PC5-U: The SDAP/PDCP/RLC/MAC/PHY functionality is specified in TS 38.300.
PDCP SDU types of IP, Ethernet, Unstructured and Address Resolution Protocol are supported. For IP PDCP SDU type, both IPv4 and IPv6 are supported.
The packets from ProSe application layer are handled by the ProSe layer before transmitting them to the AS layer, e.g. ProSe layer maps the IP, Ethernet and Unstructured packets to PC5 QoS Flow and marks the corresponding PFI.
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6.1.2.3  5G ProSe UE-to-Network Relay  p. 90

6.1.2.3.1  5G ProSe Layer-3 UE-to-Network Relay  p. 90
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 6.1.2.3.1-1: User plane protocol stack for Layer-3 UE-to-Network Relay
Figure 6.1.2.3.1-1: User plane protocol stack for Layer-3 UE-to-Network Relay
(⇒ copy of original 3GPP image)
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Legend:
  • GPRS Tunnelling Protocol for the user plane (GTP-U): This protocol tunnels user data between NG-RAN node and UPF as well as between the UPFs in the backbone network (not shown in the Figure). GTP-U shall encapsulate all end user PDU packets.
  • SMF controls the user plane tunnel establishment and establishes User Plane Bearers between NG-RAN node and UPF.
  • UDP/IP: These are the backbone network protocols used for routing user data and control signalling.
  • Uu: The NR Uu radio protocols of NG-RAN between the UE-to-Network Relay and the NG-RAN node are specified in TS 38.300.
  • PC5-U: The radio protocols between the UE and the UE-to-Network Relay are specified in clause 6.1.2.2.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 6.1.2.3.1-2: User plane protocol stacks for Layer-3 UE-to-Network Relay with N3IWF support
Figure 6.1.2.3.1-2: User plane protocol stacks for Layer-3 UE-to-Network Relay with N3IWF support
(⇒ copy of original 3GPP image)
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Legend:
There may be zero, one or multiple 5G ProSe Intermediate UE-to-Network Relay(s) between the 5G ProSe Remote UE and the 5G ProSe UE-to-Network Relay. If there is no 5G ProSe Intermediate UE-to-Network Relay, the IP connection and the PC5 link is between the 5G ProSe Remote UE and the 5G ProSe UE-to-Network Relay.
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6.1.2.3.2  5G ProSe Layer-2 UE-to-Network Relay  p. 90
Figure 6.1.2.3.2-1 illustrates the protocol stack for the user plane transport, related to a PDU Session, including a 5G ProSe Layer 2 UE-to-Network Relay. The PDU layer corresponds to the PDU carried between the 5G ProSe Layer-2 Remote UE and the Data Network (DN) over the PDU session. The SDAP and PDCP protocols are specified in TS 38.300. PDCP end-to-end connection is between the 5G ProSe Layer-2 Remote UE and NG-RAN. The functionality of the adaptation layer is specified in TS 38.351.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 6.1.2.3.2-1: End-to-End User Plane Stack for a 5G ProSe Remote UE using 5G ProSe Layer-2 UE-to-Network Relay
Figure 6.1.2.3.2-1: End-to-End User Plane Stack for a 5G ProSe Remote UE using 5G ProSe Layer-2 UE-to-Network Relay
(⇒ copy of original 3GPP image)
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6.1.2.4  5G ProSe UE-to-UE Relay |R18|  p. 91

6.1.2.4.1  5G ProSe Layer-2 UE-to-UE Relay  p. 91
Figure 6.1.2.4.1-1 illustrates user plane protocol stacks using a 5G ProSe Layer-2 UE-to-UE Relay. Security is established end-to-end between 5G ProSe End UEs as shown by the PDCP layer terminating in the 5G ProSe End UEs.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 6.1.2.4.1-1: End-to-End User Plane protocol stacks using a 5G ProSe Layer-2 UE-to-UE Relay
Figure 6.1.2.4.1-1: End-to-End User Plane protocol stacks using a 5G ProSe Layer-2 UE-to-UE Relay
(⇒ copy of original 3GPP image)
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6.1.2.4.2  5G ProSe Layer-3 UE-to-UE Relay  p. 91
The user plane protocol stack of the PC5 unicast link between 5G ProSe End UEs and 5G ProSe Layer-3 UE-to-UE Relay reuses the user plane protocol stack defined in clause 6.1.2.2.

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