5.1 Control and User Plane Protocol Stacks

23.4023GPPArchitecture enhancements for non-3GPP accessesRelease 18TS

5.1.1 Void

5.1.2 General

TS 23.401 [4] defines the protocol stack for both the control plane and user plane for 3GPP accesses using GTP-based S5/S8. This clause defines the protocol stacks for 3GPP accesses using the PMIP-based S5/S8.

5.1.3 Control Plane

5.1.3.1 Serving GW – PDN GW

Legend:

– The control part of PMIPv6 specification, RFC 5213 [8]) protocol is used for signalling messages between Serving GW and PDN GW (S5 or S8).

Figure 5.1.3.1-1: Control Plane for PMIP-based S5 and PMIP-based S8 Interfaces

5.1.4 User Plane

5.1.4.1 UE – PDN GW User Plane with E-UTRAN

Legend:

– On the S5/S8 interface, the tunnelling layer implements GRE encapsulation applicable for PMIPv6.

– MME controls the user plane tunnel establishment and establishes User Plane Bearers between eNodeB and Serving GW.

– EUTRAN-Uu: The radio protocols of E-UTRAN between the UE and the eNodeB are specified in TS 36.300 [6].

– IP: This refers to network layer protocols. On the Serving Gateway this includes termination of the UE-Serving Gateway link-local protocols (e.g. IPv6 Router Solicitation/Advertisement) and forwarding of user plane IP packets between the UE-SGW point-to-point logical link and the S5/S8 tunnel for the UE.

Figure 5.1.4.1-1: User Plane for E-UTRAN

5.1.4.2 UE – PDN GW User Plane with 2G access via the S4 Interface

Legend:

– On the S5/S8 interface, the tunnelling layer implements GRE encapsulation applicable for PMIPv6.

– Protocols on the Um and the Gb interfaces are described in the TS 23.060 [21].

– IP: This refers to network layer protocols. On the Serving Gateway this includes termination of the UE-Serving Gateway link-local protocols (e.g. Router Solicitation/Advertisement) and forwarding of user plane IP packets between the UE-SGW point-to-point logical link and the S5/S8 tunnel for the UE.

Figure 5.1.4.2-1: User Plane for A/Gb mode

5.1.4.3 UE – PDN GW User Plane with 3G Access via the S4 Interface

Legend:

– On the S5/S8 interface, the tunnelling layer implements GRE encapsulation applicable for PMIPv6.

– Protocols on the Uu and the Iu interfaces are described in the TS 23.060 [21].

– IP: This refers to network layer protocols. On the Serving Gateway this includes termination of the UE-Serving Gateway link-local protocols (e.g. IPv6 Router Solicitation/Advertisement) and forwarding of user plane IP packets between the UE-SGW point-to-point logical link and the S5/S8 tunnel for the UE.

Figure 5.1.4.3-1: User Plane for Iu mode

5.1.4.4 UE – PDN-GW User Plane with 3G Access via the S12 Interface

Legend:

– On the S5/S8 interface, the tunnelling layer implements GRE encapsulation applicable for PMIPv6.

– Protocols on the Uu interface are described in the TS 23.060 [21].

– SGSN controls the user plane tunnel establishment and may establish a Direct Tunnel between UTRAN and Serving GW.

– IP: This refers to network layer protocols. On the Serving Gateway this includes termination of the UE-Serving Gateway link-local protocols (e.g. IPv6 Router Solicitation/Advertisement) and forwarding of user plane IP packets between the UE-SGW point-to-point logical link and the S5/S8 tunnel for the UE.

Figure 5.1.4.4-1: User Plane for UTRAN mode and Direct Tunnel on S12