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full Table of Contents for  TS 23.501  Word version:   16.3.0

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1…   3…   4…   4.2.4   4.2.5…   4.2.8            4.2.9…   4.3…   4.3.3   4.3.4   4.3.5   4.4…   4.4.6…   4.4.8   5…   5.4…   5.6…   5.7…   5.8…   5.10…   5.16…   5.17   5.18…   5.27…   5.31   5.32   5.33   5.34   5.35…   6…   6.3…   7…   7.2…   8…   8.2.4   8.2.5…   8.3…   A…   D…   E…   F   G…   G.3   G.4…

 

5.34  Support of deployments topologies with specific SMF Service Areas [R16]Word-p. 305
5.34.1  General
When the UE is outside of the SMF Service Area, an I-SMF is inserted between the SMF and the AMF. The I-SMF has a N11 interface with the AMF and a N16a interface with the SMF and is responsible of controlling the UPF(s) that the SMF cannot directly control. The exchange of the SM context and forwarding tunnel information if needed are interacted between two SMFs directly without involvement of AMF.
Depending on scenario, a PDU Session in non-roaming case or local breakout is either served by a single SMF or served by an SMF and an I-SMF. When a PDU Session is served by both an SMF and an I-SMF, the SMF is the NF instance that has the interfaces towards the PCF and CHF.
5.34.2  ArchitectureWord-p. 306
5.34.2.1  SBA architecture
5.34.2.2  Non-roaming architecture
Reproduction of 3GPP TS 23.501, Figure 5.34.2.2-1: Non-roaming architecture with I-SMF insertion to the PDU Session in reference point representation, with no UL-CL/BP
Figure 5.34.2.2-1: Non-roaming architecture with I-SMF insertion to the PDU Session in reference point representation, with no UL-CL/BP
Reproduction of 3GPP TS 23.501, Figure 5.34.2.2-2: Non-roaming architecture with I-SMF insertion to the PDU Session in reference point representation, with UL-CL/BP
Figure 5.34.2.2-2: Non-roaming architecture with I-SMF insertion to the PDU Session in reference point representation, with UL-CL/BP
5.34.2.3  Roaming architectureWord-p. 307
Reproduction of 3GPP TS 23.501, Figure 5.34.2.3-1: Roaming 5G System architecture with SMF/I-SMF - local breakout scenario in reference point representation
Figure 5.34.2.3-1: Roaming 5G System architecture with SMF/I-SMF - local breakout scenario in reference point representation
5.34.3  I-SMF selection
5.34.4  Usage of an UL Classifier for a PDU Session controlled by I-SMFWord-p. 308
Reproduction of 3GPP TS 23.501, Figure 5.34.4-1: User plane Architecture for the Uplink Classifier controlled by I-SMF
Figure 5.34.4-1: User plane Architecture for the Uplink Classifier controlled by I-SMF
5.34.5  Usage of IPv6 multi-homing for a PDU Session controlled by I-SMFWord-p. 309
Reproduction of 3GPP TS 23.501, Figure 5.34.5-1: Multi-homed PDU Session: Branching Point controlled by I-SMF
Figure 5.34.5-1: Multi-homed PDU Session: Branching Point controlled by I-SMF
5.34.6  Interaction between I-SMF and SMF for the support of traffic offload by UPF controlled by the I-SMF
5.34.7  Event ManagementWord-p. 311
5.34.8  Support for Cellular IoT

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