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Content for  TS 23.304  Word version:  18.5.1

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6  Functional description and information flowsp. 71

6.1  Control and user plane stacksp. 71

6.1.1  Control Planep. 71

6.1.1.1  Generalp. 71

The control plane stack consists of protocols for controlling:
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6.1.1.2  UE - UEp. 71

6.1.1.2.1  Discovery plane PC5 interfacep. 71
The PC5 communication channel is used to carry the discovery messages over PC5 which are differentiated from other PC5 messages by the AS layer.
Figure 6.1.1.2.1-1 depicts a discovery plane for NR PC5 reference point.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 6.1.1.2.1-1: Discovery Plane PC5 Interface
Figure 6.1.1.2.1-1: Discovery Plane PC5 Interface
(⇒ copy of original 3GPP image)
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Legend:
  • PC5-D: The PDCP/RLC/MAC/PHY functionality is specified in TS 38.300.
  • The "ProSe Discovery protocol" is used for handling ProSe Direct Discovery as specified in clause 6.3.2.
6.1.1.2.2  PC5 Signalling Protocolp. 72
The PC5 Signalling Protocol stack specified in clause 6.1.2 of TS 23.287 is used. The protocol used for the control plane signalling over the PC5 reference point for the secure layer-2 link is specified in clauses 6.4.3, 6.5.1 and 6.5.2.
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6.1.1.3  UE - 5G DDNMFp. 72

Copy of original 3GPP image for 3GPP TS 23.304, Fig. 6.1.1.3-1: Control Plane for PC3a Interface
Figure 6.1.1.3-1: Control Plane for PC3a Interface
(⇒ copy of original 3GPP image)
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Legend:
  • ProSe Control Signalling between UE and 5G DDNMF is carried over the user plane and using the PC3a protocol as specified in TS 24.554.

6.1.1.4  5G DDNMF - UDMp. 72

5G DDNMF uses Nudm interface defined in TS 23.501 to obtain the UE's subscription information for the authorization of the 5G ProSe Direct Discovery requests.

6.1.1.5  5G DDNMF - 5G DDNMFp. 72

The control plane protocol(s) between 5G DDNMFs are defined in TS 29.500.
The 5G DDNMFs uses N5g-ddnmf 5G DDNMF services defined in clause 7.1 to access the services provided by the other 5G DDNMF(s). The 5G DDNMF in HPLMN uses NRF to discover the 5G DDNMFs in VPLMN and Local PLMNs.

6.1.1.6  5G DDNMF - ProSe Application Serverp. 72

The 5G System architecture supports the service based Npc2 interface between 5G DDNMF and ProSe Application Server and optionally supports PC2 interface between 5G DDNMF and ProSe Application Server, to enable Proximity Services. See TS 23.501 and TS 23.303.
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6.1.1.7  5G ProSe UE-to-Network Relayp. 73

6.1.1.7.1  5G ProSe Layer-3 UE-to-Network Relayp. 73
The UE-UE protocol stacks for discovery and PC5 link management as defined in clause 6.1.1.2 apply to 5G ProSe Remote UE and 5G ProSe Layer-3 UE-to-Network Relay.
Additionally, when N3IWF is supported by the 5G ProSe Layer-3 UE-to-Network Relay, the following control plane protocol stack apply.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 6.1.1.7.1-1: Control plane protocol stacks between 5G ProSe Layer-3 Remote UE and N3IWF over 5G ProSe Layer-3 UE-to-Network Relay before the signalling IPSec SA is established
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Legend:
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 6.1.1.7.1-2: Control plane protocol stacks between 5G ProSe Layer-3 Remote UE and N3IWF over 5G ProSe Layer-3 UE-to-Network Relay after the signalling IPSec SA is established
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Legend:
6.1.1.7.2  5G ProSe Layer-2 UE-to-Network Relayp. 73
The UE-UE protocol stacks for discovery and PC5 signalling defined in clause 6.1.1.2 apply to 5G ProSe Remote UE and 5G ProSe Layer-2 UE-to-Network Relay.
Figure 6.1.1.7.2-1 illustrates the protocol stack of the NAS connection for the 5G ProSe Layer-2 Remote UE for NAS-MM and NAS-SM. The NAS messages are transparently transferred between the 5G ProSe Layer-2 Remote UE and NG-RAN over the 5G ProSe Layer-2 UE-to-Network Relay using:
  • PDCP end-to-end connection between the 5G ProSe Layer-2 Remote UE and NG-RAN, where the role of the 5G ProSe Layer-2 UE-to-Network Relay is to relay the PDUs over the signalling radio bear without any modifications and using the functionality of the adaptation layer as specified in TS 38.300.
  • Connection between NG-RAN and AMF over N2.
  • Connection between AMF and SMF over N11.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 6.1.1.7.2-1: End-to-End Control Plane for a Remote UE using Layer-2 UE-to-Network Relay
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The control plane protocol stack used by the 5G ProSe Layer-2 UE-to-Network Relay is defined in clause 8.2.2 of TS 23.501.

6.1.1.8  5G ProSe UE-to-UE Relay |R18|p. 74

6.1.1.8.1  5G ProSe Layer-2 UE-to-UE Relayp. 74
Figure 6.1.1.8.1-1 illustrates control 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. 6.1.1.8.1-1: End-to-End Control Plane protocol stacks using a 5G ProSe Layer-2 UE-to-UE Relay
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6.1.1.8.2  5G ProSe Layer-3 UE-to-UE Relayp. 74
The control plane protocol stack of the PC5 unicast link between 5G ProSe End UEs and 5G ProSe Layer-3 UE-to-UE Relay reuses the PC5-S protocol stack defined in clause 6.1.1.2.

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