5G Network Architecture and FMC
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The document discusses 5G network architecture and functional core (5GC). Key points include: - Network slicing is a key 5G enabler that allows for separation of concerns, diverging use cases, and reduced time to market. - The 5G core standard defines a service-based architecture where network functions can interact through interfaces to enable multi-vendor integration and flexibility. - The 5GC introduces new network functions and a split between control and user plane functions, replacing the 4G Evolved Packet Core (EPC).
5G Network Architecture and FMC
- 2. 5G Network Architecture and FMC Joe Wilke, Ericsson July 2017
- 3. National sitesDistributed sitesAccess sitesDevices / Local NW Global sites Application Cloud Transport Cloud Infrastructure Management & Monetization Access, Mobility, Network applicationsMobile Fixed Network Slices Automation Actionable insights Service optimized connectivity Agility Efficiency Efficiency Agility Scale Ericsson 5G core system Key system areas
- 4. • Network Slicing is a key enabler supporting – Separation of concern – Diverging Use Cases and Requirement – Multiple instantiations of same functionality – Reduced TTM • 5G Mobile Broadband is an evolution of current 4G MBB, but using the Service Based architecture as basis • Support possibility for diverging architectures for new services • Automation and programmability important part of target architecture Overall 5G Core Architecture Strategy
- 5. • The 5G core standardization should define a functional architecture where implementation technologies can be evolved and replaced over time • Key principles: – Prioritize interfaces to support Multi-vendor integration – Scale UP and CP functionality independently – Allow for a flexible deployment of UP separate from the CP – Supporting authentication for both IMSI-based and non IMSI-based identities – Allows for different network configurations in different network slices – Abstract transport layer from 3GPP NFs 5G Core Network Architecture Key Principles
- 6. • CP/UP Split • NW slicing • Service Based Architecture SBA 5G – New Concepts
- 7. 5G CORE architecture overview Changes and improvements compared to 4G S1-MME S1-U S5 S11 HSS PCRF Gx S6a PGWSGW EPC today MME SGi MMES1-MME S1-U S11 HSS PCRF Gx S6a SGi After CUPS SGW CP PGW CP SGW UP PGW UP Mapping the EPC functions to new 5G CN functions N3 N6 N7 N4 UPF SMF PCFAUSF NG11 UDM N13 N8N12 N10 AMF N15 Access & Mobility management Function (AMF) MME User Plane Function (UPF) SGW UP PGW UP Policy Control Function (PCF) PCRF Session Management Function (SMF) SGW CP PGW CP MME Authentication Server Function (AUSF) and User Data Management (UDM) HSS/ AAA
- 8. Network Services/Products Logical MBB Net Logical Enterprise Net Logical MDN Network slice is a logical network serving a defined business purpose or customer, consisting of all required network resources configured together. It is created, changed and removed by management functions. • Logical network managed by a provider • Enabler for services, not a service • Mobile and fixed • Resources may be physical or virtual, dedicated or shared • Independent/”Isolated” but may share resources • May integrate services from other providers, facilitating e.g. aggregation and roaming • May include management functions and possible exposure of control/management to customer Access Resources Nw Function Netw. Mgmt Transport Resources Cloud Resources Resources/Components Network Slices NW Slice Mgmt Ericsson Internal | © Ericsson AB 2015 | 2015-11-06 | Page 8 Network Slice Definition One Network – Multiple Industries
- 9. Federated Network Slicing Service Providing operator NW Slice for hosted service VNF Business Customers Partner Operator Service NW Slice SLA Orchestration Service NW Slice SLA Orchestration Enable seamless service experience and service control vUPvCoreNW Slice
- 10. Service Based Architecture 3GPP TS 23.501 V1.0.0 (2017-06) Reference point representation. shows the interaction that exist between the NF services in the network functions described by point-to-point reference point (e.g. N11) between any two network functions (e.g. AMF and SMF). Service-based representation, where network functions (e.g. AMF) within the control plane enables other authorized network functions to access their services UE (R)AN UPF AF AMF SMF PCF UDM DNN6 N1 NRFNEF N3 N2 N4 AUSF Nausf Namf Nsmf NpcfNnrfNnef Nudm Naf AMF PCF UE (R)AN UPF DN N13 N7 N3 N6 N2 N4N1 AFN5SMFN11 N9 AUSF N8N12 UDM N10 N14 N15 Authentication Server Function (AUSF) Core Access and Mobility Management Function (AMF) Data network (DN), e.g. operator services, Internet access or 3rd party services Network Exposure Function (NEF) NF Repository Function (NRF) Policy Control function (PCF) Session Management Function (SMF) Unified Data Management (UDM) User plane Function (UPF) Application Function (AF) User Equipment (UE) The 5G architecture is defined as service-based and the interaction between network functions is represented in two ways. Network functions within the 5GC Control Plane shall only use service-based interfaces for their interactions.
- 11. NG UE N2 N3 N6 N4 5G RAN UPF SMFAUSF N1 AMF 5G CORE architecture Functional view – service-based representation AFPCFUDM NEF NamfNausf NpcfNudm Nsmf Naf Data Network (e.g. operator or Internet) NRF Nnrf › Network Functions within the 5GC Control Plane (CP) use Service-Based Interfaces (SBI) for their interactions: › A CP NF can provide one or more NF Services Nnef AF Application Function AMF Access and Mobility Management Function AUSF Authentication Server Function NEF Network Exposure Function NRF Network Repository Function PCF Policy Control Function SMF Session Management Function UDM Unified Data Management UPF User Plane Function
- 12. NF A Request Reply Service-based interface in 5GC Services and Operations NF B NF Service A1 Consumer NF Service B1 Consumer NF Service A1 Producer NF Service B1 Producer Subscribe Notify Service Based Interface (SBI) NF Service Operation › A Control Plane Network Function can provide one or more NF Services › A NF Service consist of operations based on either a request-response or a subscribe-notify model › Common control protocol using e.g. HTTP based API, replacing protocols like e.g. Diameter
- 13. 5G EPC architecture overview Functional view – non-roaming RAN-CN interaction Data Network (e.g. operator or Internet) LTE/EPC UE NR/EPC UE S1-MME S1-U SGi Gx Rx Sx LTE + NR RAN SGW/ PGW UP SGW/ PGW CP PCRF EPC NAS S11 HSS S6a MME S10 LTE RRC LTE PDCP LTE Uu S5 › Enables early introduction of NR through connectivity Option 3 › UE anchored to network over LTE/EPC control plane › Wide area coverage through LTE with NR as capacity boost
- 14. 5G Standards plan 2015 2016 2017 2018 2019 2020 IMT-2020 Requirements IMT-2020 Proposals IMT-2020 Evaluation WRC WRC WSITU IMT-2020 Specs Rel-14Rel-13 Rel-15 Rel-16 Rel-17, ... Study on next generation network (technical realization, self evaluation) 5G/NR Phase 1 5G/NR Phase 2 LTE evo LTE evo LTE evo 3GPP Phase 1: Rel-15 RAN + Core targeting first phase of deployments 2020 Phase 2: Rel-16 targeting ITU IMT- 2020 submission