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3GPP Packet Core Towards 5G Communication Systems

This presentation provides an overview of 3GPP packet core and 5G systems. Some enabler features are outlined, such as network slicing. This presentation was prepared for the 20th Annual International Conference on Next Generation Internet and Related Technologies Net-Centric 2017 that was held at George Mason University.

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3GPP Packet Core Towards 5G Communication Systems

  1. 1. 3GPP Packet Core Towards 5G Communication Systems: An Overview Peyman TalebiFard, Senior Technical Staff
  2. 2. Net-Centric 20th Annual International Conference on Next Generation Internet and Related Technologies January 16, 2018 – George Mason University
  3. 3. Outline  5G System Architecture  Network Slicing  Support for Edge Computing  Protocols, Interfaces and Notable Changes
  4. 4.  5G System Architecture  Network Slicing  Support for Edge Computing  Protocols, Interfaces and Notable Changes
  5. 5. Ofinno Technologies, LLC What is 5G?  An end-to-end transformation of network architecture.  Empowering socio-economic transformation.  Connectivity.  Higher capacity and Enhanced performance.  New capabilities and use cases (enhanced Mobile Broadband (eMBB), mission critical communication, and massive-scale connectivity for Internet of Things (IoT) devices, such as sensors, wearables, smart vehicles. 5
  6. 6. Ofinno Technologies, LLC 4G Evolved Packet Core 6 3GPP TS 23.401 V15.1.0 (2017-09) SGi S12 S3 S1-MME PCRF Gx S6a HSS Operator's IP Services (e.g. IMS, PSS etc.) Rx S10 UE SGSN LTE-Uu E-UTRAN MME S11 S5Serving Gateway PDN Gateway S1-U S4 UTRAN GERAN User /Data Plane Control Plane
  7. 7. Ofinno Technologies, LLC Evolved Packet Core & CUPS 7 3GPP TS 23.401 V15.1.0 (2017-09) 3GPP TS 23.214 V15.0.0 (2017-09) SGi S12 S3 S1-MME PCRF Gx S6a HSS Operator's IP Services (e.g. IMS, PSS etc.) Rx S10 UE SGSN LTE-Uu E-UTRAN MME S11 S5Serving Gateway PDN Gateway S1-U S4 UTRAN GERAN SGi S12 Operator's IP Services (e.g. IMS, PSS etc.) S11 S5/8-C Serving PDN S1-U S4 -C Sd TDF-U GyGz Gateway-U Gateway-U S2a-C S2b-C Gyn Gzn S4-U S2a-U S2b-U SGi S6b Gn/Gp-C Gn/Gp-U Gx S5/8-U TDF-C PDN Gateway-C Serving Gateway-C Sxa Sxb Sxc Gw Gwn CUPS Control Plane User Plane Separation
  8. 8. Ofinno Technologies, LLC 5G System Architecture 8 TS 23.501 System Architecture for the 5G System, Stage 2 (Release 15) UE (R)AN UPF AF AMF SMF PCF UDM DNN6 NRFNEF N3 N2 N4 AUSF Nausf Namf Nsmf NpcfNnrfNnef Nudm Naf NSSF Nnssf Control Plane User Plane Service Based Interaction Control Plane User Plane Separation Simplified
  9. 9. Ofinno Technologies, LLC 5G Core Network Functions  Termination of RAN CP interface (N2).  Termination of NAS (N1), NAS ciphering and integrity protection.  Registration management.  Connection management.  Reachability management.  Mobility Management.  Lawful intercept.  Provide transport for SM messages between UE and SMF.  Transparent proxy for routing SM messages.  Access Authentication.  Access Authorization.  Provide transport for SMS messages between UE and SMSF. 9 AMF: Access and Mobility Management Function TS 23.501 System Architecture for the 5G System, Stage 2 (Release 15)
  10. 10. Ofinno Technologies, LLC 5G Core Network Functions  Session Management e.g. Session establishment, modify and release, including tunnel maintenance between UPF and AN node.  UE IP address allocation & management.  Selection and control of UP function.  Configures traffic steering at UPF to route traffic to proper destination.  Lawful intercept.  Charging data collection and support of charging interfaces.  Termination of SM parts of NAS messages.  Downlink Data Notification.  Initiator of AN specific SM information, sent via AMF over N2 to AN.  Roaming functionality 10 SMF: Session Management Function TS 23.501 System Architecture for the 5G System, Stage 2 (Release 15)
  11. 11. Ofinno Technologies, LLC 5G Core Network Functions  Anchor point for Intra-/Inter-RAT mobility (when applicable).  External PDU Session point of interconnect to Data Network.  Packet routing & forwarding (e.g. Uplink classifier, Branching point, multi-homed PDU session).  Packet inspection (e.g. Application detection based on service data flow template and the optional PFDs received from the SMF in addition).  User Plane part of policy rule enforcement.  Lawful intercept (UP collection).  Traffic usage reporting.  QoS handling for user plane, e.g. UL/DL rate enforcement.  Downlink packet buffering and downlink data notification triggering. 11 UPF: User Plane Function TS 23.501 System Architecture for the 5G System, Stage 2 (Release 15)
  12. 12.  5G System Architecture  Network Slicing  Support for Edge Computing  Protocols, Interfaces and Notable Changes
  13. 13. Ofinno Technologies, LLC Network Slicing  Provide a basis for diverse services on the same network infrastructure.  Each slice is composed of 5G network functions, some of which can be shared with other slices. 13 Reference: www.3GPP.org
  14. 14. Ofinno Technologies, LLC Network Slicing  Provides support for vertical services.  Provides isolation.  Based on 3GPP, a Network Slice within a PLMN includes:  The Core Network Control Plane.  User Plane Network Functions. 14 Reference: www.3GPP.org
  15. 15. Ofinno Technologies, LLC Network Slicing 15 Reference: www.3GPP.org
  16. 16. Ofinno Technologies, LLC Isolation and Coexistence 16 3GPP TR 23.799 V14.0.0 (2016-12) Network Slice Deployment Scenarios
  17. 17. Ofinno Technologies, LLC Isolation and Coexistence 17 UPF SMF 1 SMF 2 CN Instance #1 CP Shared (R)AN CN Instance #2 CP UP Instance #1 CN Instance #1 CP UP Shared (R)AN CN Instance #2 CP UP SMF 1 UPF-1 SMF 2 UPF-2
  18. 18.  5G System Architecture  Network Slicing  Support for Edge Computing  Protocols, Interfaces and Notable Changes
  19. 19. Ofinno Technologies, LLC Support for Edge Computing  Edge computing enables operator and 3rd party services to be hosted close to the UE's access point of attachment, so as to achieve an efficient service delivery through the reduced end-to-end latency and load on the transport network.  The 5G Core Network selects a UPF close to the UE and executes the traffic steering from the UPF to the local Data Network via an N6 interface. This may be based on the UE's subscription data, UE location, the information from Application Function (AF), policy or other related traffic rules. 19 TS 23.501 System Architecture for the 5G System, Stage 2 (Release 15)
  20. 20. Ofinno Technologies, LLC Support for Edge Computing  To support traffic offloading for Edge Computing the SMF may control the data path of a PDU (Packet Data Unit) session.  Each PDU session anchor supporting a PDU session provides a different access to the same DN. This can be achieved in essentially three ways:  Usage of an Uplink Classifier functionality for a PDU session  Usage of an IPv6 multi-homing for a PDU session  Support for Local Area Data Network (LADN) 20 TS 23.501 System Architecture for the 5G System, Stage 2 (Release 15)
  21. 21. Ofinno Technologies, LLC Uplink Classifier  To support selective traffic routing to the DN or to support SSC mode 3.  Traffic filters provided by SMF.  Insertion and removal are decided by SMF.  Generic N4 procedures and UPF capabilities are utilized. 21 UE AN DN N1 N2 N4 N4 N4 N6 N6 DN N9 N9 N3 UPF Uplink Classifier N11 AMF SMF Local access to the same DN UPF PDU session anchor 1 UPF PDU session anchor 2 TS 23.501 System Architecture for the 5G System, Stage 2 (Release 15)
  22. 22. Ofinno Technologies, LLC IPv6 Multi-homing  A PDU Session may be associated with multiple IPv6 prefixes.  The multi-homed PDU Session provides access to the Data Network via more than one PDU Session Anchor.  The Branching Point provides forwarding of UL traffic towards the different PDU Session Anchors and merge of DL traffic to the UE. 22 TS 23.501 System Architecture for the 5G System, Stage 2 (Release 15) UE AN DN N1 N2 N4 N4 N4 N6 N6 N9 N9 N3 UPF PDU session anchor 1 UPF Branching Point N11 AMF SMF UPF PDU session anchor 2 make-before-break PSA relocation
  23. 23. Ofinno Technologies, LLC Local Area Data Network  The UE explicitly requests a PDU session to a special APN/DNN.  LADN Information is provided to the UE by the AMF during registration (e.g., LADN DNN and LADN service area information).  AMF tracks the UE and informs the SMF whether the UE is in the LADN service area.  The UE may request a PDU session establishment for an available LADN when the UE is located in the LADN service area. 23 TS 23.501 System Architecture for the 5G System, Stage 2 (Release 15)
  24. 24.  5G System Architecture  Network Slicing  Support for Edge Computing  Protocols, Interfaces and Notable Changes
  25. 25. Ofinno Technologies, LLC Protocol, Interfaces & Notable Changes 25 Lower Layer UE NAS-MM NAS- SM SMS Other Lower Layer NAS-MM AMF NAS Transport NAS- SM SMF SMS SMSF Other Other NF N11 / -Nsmf N20 / -Nsmsf Nother TS 23.501 System Architecture for the 5G System, Stage 2 (Release 15) NAS transport for SM, SMS and other services
  26. 26. Ofinno Technologies, LLC Protocol, Interfaces & Notable Changes 26 TS 23.502 Procedures for the 5G System; Stage 2 (Release 15) UPF 2.N4 Session Establishment Request SMF 3.N4 Session Establishment Response 1.Trigger to establish PDU session or relocate UPF 4.Interaction with other network function UPF 2.N4 Session Modification Request SMF 3.N4 Session Modification Response 1.Trigger to modify PDU session 4.Interaction with other network function SMF and UPF interactions over N4
  27. 27. Ofinno Technologies, LLC Protocol, Interfaces & Notable Changes Service Based Interaction (SBI) among NFs 27 NF_A (Consumer ) NF_B (Producer) ProducerRequest Response NF_A (Consumer ) NF_B (Producer) ProducerSubscribe Notify NF_A (Consumer) NF_B (Producer) ProducerSubscribe Notify NF_C (Consumer) Producer TS 23.502 Procedures for the 5G System; Stage 2 (Release 15) TS 23.501 System Architecture for the 5G System, Stage 2 (Release 15)
  28. 28. Ofinno Technologies, LLC Protocol, Interfaces & Notable Changes  The protocol stack for the service based interfaces is mainly based on HTTP.  Details of SBI and protocol stack are described in 3GPP TS 29.500. 28 Application HTTP/2 TCP IP L2 L1 3GPP TS 29.500
  29. 29. References  3GPP TS 29.500, 5G System; Technical Realization of Service Based Architecture; Stage 3  3GPP TS 23.501, System Architecture for the 5G System, Stage 2 (Release 15)  3GPP TS 23.502, Procedures for the 5G System; Stage 2 (Release 15)  3GPP TS 23.401 V15.1.0 (2017-09), General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access.  3GPP TS 23.214 V15.0.0 (2017-09), Architecture enhancements for control and user plane separation of EPC nodes.
  30. 30. Contact Peyman TalebiFard, PhD Senior Technical Staff Ofinno Tehnologies Office: (571) 599-2923 www.ofinno.com www.linkedin.com/in/peyman-talebifard
  31. 31. www.ofinno.com SIPO KIP O JPO EPO H Q CIP O USPT O IPO

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