The document discusses the transition to a new "All-IT Network" architecture for 5G networks based on principles of open source software and hardware, virtualization, and network softwarization. Key aspects of this new architecture include software-defined infrastructure, network functions virtualization, network slicing, open interfaces, and moving from a CAPEX to OPEX business model. The architecture aims to make networks more scalable, automated, lean, and optimized through composable, open solutions like SK Telecom's ATSCALE and COSMOS platforms.

1. 1
“Unbundling” “Open Source”
“Softwarization” “Cloudification”
• Software/Hardware Decoupling
• Unbundled Function Blocks
• Control-/User-plane Separation
• Open Source Software (OpenStack, CORD)
• Open Source Hardware (OCP, TIP)
• Open Interfaces (Fronthaul, API)
• NFV (Network Functions Virtualization)
• SDN (Software Defined Networking)
• Orchestration & Network Slicing (XaaS)
• From CAPEX model to OPEX model
• Virtualization & DevOps Environments
• Dynamic & Automated Operation
Design principles for 5G
Toward a new paradigm, All-IT Network architecture

2. 2
Future Infra – All IT Network ArchitectureToday Infra
Fixed
Unaware
Manual
Fat & Monolithic
Domain-Specific
Scalable
Cognitive
Automated
Lean
End-to-end
Static and monolithic mobile network is no longer viable.
Distinguished 5G values can be efficiently offered via new telecom infra architecture
Composable
Open
Mission-critical
Scalable
Optimized System
“ATSCALE” & “COSMOS”
SKT’s approach – ATSCALE / COSMOS
ATSCALE / COSMOS White paper download

3. 3
New Services
§ Software-defined Infrastructure
§ Open Hardware and Software
§ Universal Platform
§ Next-Generation OSS
§ Network slicing
§ Software-defined RAN
§ Software-defined Core
§ Ultra High Data Rate (AR/VR…)
§ Low Latency (Connected car, Public safety …)
§ Massive Connectivity (IoT)
ATSCALE / COSMOS – simple view

4. 4
WAN
End-to-end Network Orchestration
Local NFV Orchestrator Transport Infra Orchestrator
Unified-O
Edge DC Central DC
Open & Programmable H/W
Resource Abstraction Layer
Open & Programmable H/W
COSMOS
Virtualized Network Functions
Fronthaul
L1/L2
RF
Remote Unit
4G
5G
RNF ESF
SDRAN
CNF CSF OSF
vCore
Transport Infrastructure
Transport
Open H/W
POTN
Network Service Functions
TNF
uCTN
Mobile Connectivity Functions
uCTN
Service Orchestration and Exposure
Low Latency Service
Immersive Media
Telco Service
Virtualized Network Slice #1
#2
#N
NG-OSS
(E2EResourceMgmt.,Cognitive&IntelligentAutomation)
ATSCALE / COSMOS – detailed view
Software-defined RAN
Virtualized Core
Unified Converged
Transport Network
RNF: Radio Network Function, CNF: Core Network Function, TNF: Transport Network Function, ESF: Edge Service Function, CSF: Centralized Service Function

5. 5
① Open Front-haul and modular RAU
• Open front-haul for flexible RAN function split
• Standard interface for RAU
② CP/UP separation through standard interface
• UP in dedicated H/W and CP in virtualized function
• Standard and open interface between UP/CP
③ Open H/W and S/W
• White-box, Bare-metal, OCP-based H/W
• OpenStack-based S/W
④ MEC
• Proximity-based Mobile Edge Services
• E2E Network Slicing incl. RAN, Transport, Core
⑤ Analytics-based SON
SDRAN Orchestration
Virtualized Functions
Radio Network Functions
(UP, CP, RP)
Edge Service
Functions
Ops Supp.
Functions
Virtualization
Open H/W
User Plane Control Plane
Remote Access Unit (RAU)
User Plane – Lower Layer Radio Unit
Edge Cloud
① Open Front-haul② CP/UP separation
③ Open HW/SW
④ Biz Enabling with MEC
⑤ Analytics
A key component of ATSCALE - Software-defined RAN (SDRAN)

6. 6
End-to-end Network Orchestration
Local (DC #i) NFV Orchestrator
North-Bound I/F (Service Orchestration, NG-OSS, BSS)
South-Bound Interface (Local NFV Orchestrator, Transport Infra Orchestrator, PNF/VNF)
Transport Infra.
Orchestrator Local (DC #j) NFV Orchestrator
Dynamic End-to-End Network Slice
E2E Network Slice CatalogE2E Network Slice Life-Cycle Mgmt.
PNF/VNF Adaptor
PNF
VL VL
VNF VNFC
VNFC VNFC VL PNF
VNF VNF
Local Network Slice (DC #i) Local Network Slice (DC #j)
Open API
Generic VNFM
Day-0 Configuration
(Deployment)
Common VIM Generic VNFM Common VIM
NFV MANO
Service Orchestration
BSS
Transport-SDN
Local NS LCM
NS LCM
Service LCM
VM
VM Container
VNF LCM Resource LCM
Day-N Configuration
(Service Config.)
Descriptor On-board
E2E
Network Slice
LCM
Service LCM
Order LCM
NG-OSS
(InventoryMgmt.,Collection,E2EAssurance,Analytics,Controls)
Status
NSLCM
StatusLCM Action
TNaaS
LCM: Life-Cycle Management NS: N/W Service VNF: Virtual N/W Function VNFC: VNF Component VIM: Virtualized Infra Manager
VL: Virtual Link PNF: Physical N/W Function DC: Datacenter MANO: Mgmt. and Orchestration
Dynamic E2E Network Slicing & its Life-Cycle Management(LCM)

7. 7
Media IoT AI
Autonomous
driving
Telco
(LTE/5G)
Physical Resource
Service-Optimized Platform
Open
Hardware
(Physical Infrastructure)
Services
Open
Software
(Virtual Infrastructure)
Unbundled
Server(CPU
)
GPUNetwork Storage
Virtual Resource
SW-Defined
Compute
SW-Defined
Networking
SW-Defined
Storage
AI Compute
Cloud
Virtualization Layer
Data Center
Operation
Automation/
Intelligence
High-Speed
NW Analytics
COSMOS: Composable, Open, Scalable, Mission-critical Optimized System
Open Software and Hardware for telco-grade Mission-critical services

8. 8
ü Hybrid Resource
(VM, Container, BM)
ü Open Source based
ü Optimized for diverse worklo
ad (5G, AI, …)
COSMOS’ Open Software Architecture
SDDC(Software Defined Data Center) based on Open source

9. 9
STK is actively engaged in diverse open source community activities in pursuit of ‘open innovation’
SK telecom’s open source community activities

10. 10
M-CORD
SK telecom with leading service providers, AT&T and Verizon, is envisioning an open 5G platform
* Open source EPC (from Radisys), RAN L2, L3 (from Radisys), Scalable S/PGW (Intel)
Contributing Members
Collaborators

11. 11
M-CORD
M-CORD showcased innovation both for mobile network infrastructure and services at MWC `17
MME disaggregation
& IoT GW
Connectionless
for Static IoT
End-to-End
Network slicing
Public safety
w/ Network cookie
Active-testing
& Analytics
INFRASTRUCTURE Services

12. 12
ü Kubernetes based Life-Cycle management
ü SONA+ONOS based Virtual Network + Ceph
ü Optimization for Telco-workload
OpenStack in SK telecom
Community version OpenStack + SONA (Virtual network) + SKT Ceph (Storage)

13. 13
TIP Project Groups
13
Telecom Infra Project (TIP)
TIP started to rethink the existing telecom infrastructure to support the unconnected people
Access Projects Backhaul Projects Core & Management Projects
OpenCellular –Wireless Acce
ss Platform Design
Edge Computing
People and Process
System Integration and
Site Optimization
Solutions Integration
Open Optical Packet Transpo
rt
Core Network Optimization
Greenfield Telecom Networks

14. 14
(RF)
BaiCells,
AceAxis,
AW2S
(Lab
&
Infra)
Facebook
TIP – 4G Unbundled Project
• Construct an end-to-end unbundled
and integrated 4G solution
• Migrate to 5G as solutions &
technology become available
• Participating members:
Resolve the technical barriers to rollout of carrier-grade services with simpler, streamlined designs b
ased on open API
Lead
SI
SW

15. 15
Open innovation
through Ecosystem collaboration
is an accelerator in the journey to 5G