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Content for  TS 23.303  Word version:  16.0.0

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5  Functional Description and Information Flow

5.1  Control and user plane stacks

5.1.1  Control Plane

5.1.1.1  General

The control plane stack consists of protocols for control and support of the user plane functions:
  • controlling the configuration of the ProSe-enabled UE;
  • controlling ProSe Direct Discovery;
  • controlling the set-up of the connection between the Remote UE and the ProSe UE-to-Network Relay; and
  • controlling the attributes of an established network access connection, such as activation of an IP address.
The following control planes are used in E-UTRAN mode.

5.1.1.2  UE - ProSe Function

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Figure 5.1.1.2-1: Control Plane for PC3 Interface
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  • ProSe Control Signalling between UE and ProSe Function is carried over the user plane and is specified in TS 24.334.

5.1.1.3  HSS - ProSe FunctionWord‑p. 37
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Figure 5.1.1.3-1: Control Plane for PC4a Interface
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  • Diameter: This protocol supports the transfer of subscription and authentication data for authenticating/authorizing user access to ProSe between ProSe Function and HSS (PC4a). Diameter is defined in RFC 3588.
  • Stream Control Transmission Protocol (SCTP): This protocol transfers signalling messages. SCTP is defined in RFC 4960.
  • PC4a between the ProSe Function and the HSS is specified in TS 29.344.
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5.1.1.4  SLP - ProSe Function

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Figure 5.1.1.4-1: Control Plane for PC4b Interface
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5.1.1.5  UE - UE

5.1.1.5.1  Discovery plane PC5 interface |R13|
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Figure 5.1.1.5.1-1: Discovery Plane PC5 Interface
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  • PC5-D: The MAC/PHY functionality for E-UTRA based PC5 is specified in TS 36.300.
  • The "ProSe protocol" is used for handling ProSe Direct Discovery specified in TS 24.334.
5.1.1.5.2  PC5 Signalling Protocol |R13|Word‑p. 38
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Figure 5.1.1.5.3-1: PC5 Signalling Protocol stack
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Legend:
  • The PDCP/RLC/MAC/PHY functionality is specified in TS 36.300.
  • "PC5 Signalling Protocol" is used for control plane signalling over PC5 (e.g. establishment, maintenance and release of secure layer-2 link over PC5, TMGI monitoring requests, Cell ID announcement requests etc. as described elsewhere in this specification).
  • The SDU Type field (3 bits) in the PDCP header is used to discriminate between IP, ARP and PC5 Signalling Protocol. ARP is not supported for one-to-one communication.
  • PC5 Signalling Protocol messages are sent on a unicast Destination Layer-2 ID.
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5.1.1.6  ProSe Function - ProSe Function

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Figure 5.1.1.6-1: Control Plane for PC6 and PC7 interface
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  • PC6 is an inter-PLMN interface between the ProSe Functions in different PLMNs (EPC-level ProSe Discovery) and between the ProSe function in the HPLMN and the ProSe function in Local PLMN (ProSe Direct Discovery). PC7 is a roaming interface between the ProSe function in the HPLMN and the ProSe function in VPLMN. PC6 and PC7 are specified in TS 29.345
  • Diameter: This protocol supports the transfer of subscriber location related information between ProSe Functions (PC6/PC7). Diameter is defined in RFC 3588.
  • Stream Control Transmission Protocol (SCTP): This protocol transfers signalling messages. SCTP is defined in RFC 4960.
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5.1.1.7  ProSe Function - ProSe Application ServerWord‑p. 39
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Figure 5.1.1.7-1: Control Plane for PC2 interface
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  • PC2-AP is the PC2 Application Protocol and is specified in TS 29.343.

5.1.2  User Plane

5.1.2.1  UE - UE

(not reproduced yet)
Figure 5.1.2.1-1: User Plane for PC5 interface
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  • PC5-U: The PDCP/RLC/MAC/PHY functionality is specified in TS 36.300.
  • For PDCP SDU type "Non-IP", a "Non-IP Type" header is included in the SDU by upper layer to indicate the type of non-IP messages carried as specified in TS 24.334.

5.1.2.2  UE - UE-to-Network Relay |R13|Word‑p. 40
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Figure 5.1.2.2-1: User Plane for UE-to-Network Relay
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  • GPRS Tunnelling Protocol for the user plane (GTP U): This protocol tunnels user data between eNodeB and the S GW as well as between the S GW and the P GW in the backbone network. GTP shall encapsulate all end user IP packets.
  • MME controls the user plane tunnel establishment and establishes User Plane Bearers between eNodeB and S GW.
  • UDP/IP: These are the backbone network protocols used for routing user data and control signalling.
  • LTE-Uu: The radio protocols of E-UTRAN between the UE and the eNodeB are specified in TS 36.300.
  • PC5-U: The radio protocols of E-UTRAN between the UE and the UE-to-Network Relay are specified in clause 5.1.2.1.
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