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Virtualizing the RAN – a Small Cell Forum Update

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Small Cell Forum MWC 2016 Presentation: Small Cell Forum, Mark Grayson

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Virtualizing the RAN – a Small Cell Forum Update

  1. 1. Virtualizing the RAN – a Small Cell Forum Update Mark Grayson SCF Release Steering Group & Cisco Distinguished Engineer
  2. 2. Base Station Densification Broader set of use cases NFV and SDN Mobile Networking Mega Trends Indoor coverage, higher frequencies, shorter ranges Not just Mobile Broadband, but agility to support verticals and IoT value chains Twin focus on CAPEX/asset utilization as well as OPEX/automation © Small Cell Forum Ltd 2015
  3. 3. SCF Virtualization Activities: Addressing the historical architectural tension • Flattening the RAN architecture • Adding intelligence into the base station • Facilitating Small Cell Ecosystem • Hot Spot Capacity and Indoor Propositions • Non-ideal backhaul transport • Data Centre evolution and centralization of workloads • Simplifying the radio access network • Macro and Hot Spot Capacity Propositions • Advanced RF Co-ordination • ETSI NFV Use Case #6 • Ideal fronthaul transport CentralizationDistribution “43% of operators deploying small cells will be deploying virtualization in part of their RAN” Source: Maravedis-Rethink © Small Cell Forum Ltd 2015
  4. 4. 1. Is there any divergence between how virtualization is viewed from a macro RAN perspective versus a small cell perspective? 2. What are the real business benefits of virtualization in the RAN? Do benefits apply equally to macro and small cell deployment use cases? 3. Are current small cell architectures well suited to virtualization/cloudification? 4. Are there unique attributes of small cell transport that impact fronthaul considerations? 5. Can virtualization deliver a phased roadmap, e.g., aligned with longer-term 5G directions? 6. How do we ensure virtualization supports innovation across a multi-vendor ecosystem? Key Questions from Forum’s Operator Group (May 2014) © Small Cell Forum Ltd 2015
  5. 5. Business Rationale for Virtualization (and associated centralization) PHYRLC/MAC SON OAM APPS RRC PDCP Upper MAC Lower MAC Upper PHY Lower PHY RF Centralization Benefits RF Benefits DRAN PDCP Split MAC MAC/PHY Split PHY CPRI Transport Costs Centralization Benefits Independent of Split RF Gains improved with lower splits Transport costs minimized with higher splits © Small Cell Forum Ltd 2015
  6. 6. Accommodating Transport Limitations Physical Network Function Virtual Network Function Virtualization split One-Way Latency DL Bandwidth UL Bandwidth PDCP-RLC < 30ms 150Mbps 50Mbps Split MAC < 2ms - 6ms 150Mbps 50Mbps MAC-PHY < 2ms - 6ms 150Mbps 50Mbps Split PHY < 250µs 1000Mbps 1000Mbps © Small Cell Forum Ltd 2015
  7. 7. VNF Centralized Functions PNF Remote SC Radio Small Cell Forum: Accelerating Virtualization for non-ideal transport Centralization benefits with no additional transport requirements Additional RF benefits with limited enhanced transport requirements Dark fiber not applicable to venue PHYRLC/MAC SON OAM APPS RRC PDCP Upper MAC Lower MAC Upper PHY Lower PHY RF nFAPI Mobility, Enhanced SON, RF Co-ordination, Improved Security, Policy Enforcement… Simplified management, Advanced RF Co-ordination © Small Cell Forum Ltd 2015
  8. 8. BS Site NFVI BS Site Leveraging Existing MEF Transport Architectures © Small Cell Forum Ltd 2015 SmallCell RAN BS RAN BS RAN NC CEN CEN EVC(m) PT2 20ms EVC(sc) PT1 5ms PHY RF Physical Network Function Virtual Network Function PDCP/ RLC/MAC Virtual Network Function Co-located with Macro RAN, on- premise or in data center NFVI PoP Virtual Network Function PDCP/ RLC/MAC Virtual Network Function PDCP/ RLC/MAC On-prem NFVI nFAPI
  9. 9. 1. Evangelizing Small Cell Virtualization 2. Defining a multi-vendor nFAPI interface to enable PNF/VNF decomposition based on MAC/PHY split 3. Accelerating demonstration of multi-vendor nFAPI interface 4. Driving ETSI ISG NFV to enable data-plane acceleration support for air interface crypto, RoHC and PTP/Sync 5. ETSI NFV ISG PoC showcasing feasibility of Virtualized Centralized Small Cell supporting nFAPI interface to remote PNFs (Scoping work and demonstration) 6. Co-ordinating with BBF to define PNF Management Object and associated counters 7. NFV-MANO aspects related to transport integration to enable workload placement/affinity rules to account for transport BW and Delay 8. Initial scoping to understand multi-operator aspects of virtualized small cells 9. Driving learning's of SCF virtualization work into 5G evolution Small Cell Virtualization: The Role of the Forum © Small Cell Forum Ltd 2015
  10. 10. Board agreed work item to develop definition of nFAPI central/remote MAC/PHY spilt Conventional Small Cell PHY / RF Layer 2 RRC S1 / X2 Client IPsec GPS / Location Timing/Sync SC Management TLS / IPSec Small Cell EMS VNF Centralized Functions Layer 2 RRC S1 / X2 Client IPsec Timing/Sync Management TLS / IPSec VNF EMS PNF Remote SC Radio PNF EMS Timing/Sync PNF Management GPS / Location PHY / RF Service Discovery Service Discovery © Small Cell Forum Ltd 2015
  11. 11. VNF Centralized Functions Layer 2 RRC S1 / X2 Client IPsec Timing/Sync Management TLS / IPSec VNF EMS PNF Remote SC Radio PNF EMS Timing/Sync PNF Management GPS / Location PHY / RF Service Discovery P9 P2 P10 P3 nFAPI Decomposition P2 – Service Discovery P3 – Positioning P4 – NMM P5 – RF and PHY Control P7 – MAC-PHY main SAP P8 – PHY Diagnostics P9 – OAM P10 – Synchronization – Frequency, Phase and Time P5, P7, P8 P4 Board agreed work item to develop definition of nFAPI central/remote MAC/PHY spilt © Small Cell Forum Ltd 2015
  12. 12. Acceleration of Multi-Vendor Virtualized RAN and Management/Automation Centralized Small Cell VNF NFVI Hypervisor Hardware Resources (COTS) Multi- Vendor Remote Small Cell (PNF) DM VNF EMS (OSS/BSS) NM: PNF/VNF Co-ordination VNF Manager (VNFM) Virtualized Infrastructure Manager (VIM) NFV Orchestrator (NFVO) NFV-MANO DM VNF Manager (VNFM) Virtualized Infrastructure Manager (VIM) NFV Orchestrator (NFVO) Hypervisor Hardware Resources (COTS) • Small Cell Workload Placement Transport Network Management Integration • Hardware Acceleration of VNF Small Cell Functions IPSec Air interface Crypto RoHC PTP/Sync • Real Time Processing Aspects PCI/PCIe Pass-through, DPDK, CP/DP separation nFAPI TR-069/PNF MO PNF EMS © Small Cell Forum Ltd 2015
  13. 13. Conventional DAS Virtualized Small Cell: Addressing scalability of current multi-operator solutions Multi-Operator DAS SP#1 ENB SP#2 ENB WAN Challenging to scale down due to need to bring on premise base stations from each operator RF RF Virtualized Small Cell SP#1 VNF SP#2 VNF nFAPI nFAPI WAN Multi-Operator PNF Multi-vendor nFAPI interface avoids i) RF interfacing and ii) on-premise base station requirement © Small Cell Forum Ltd 2015 DAS OAM PNF OAM
  14. 14. Driving the virtualization narrative into 5G © Small Cell Forum Ltd 2015 (Non-CPRI) virtualized RAN architecture is set to be a foundational capability in 5G
  15. 15. Topic Findings What are the real business benefits of virtualization in the RAN? Identified centralization benefits, transport costs & MANO/Automation elastic scaling capabilities Small Cell Virtualization Key Takeaways © Small Cell Forum Ltd 2015
  16. 16. Topic Findings What are the real business benefits of virtualization in the RAN? Identified centralization benefits, transport costs & MANO/Automation elastic scaling capabilities Are current small cell architectures well suited to virtualization? Yes - FAPI MAC/PHY decomposition well suited to provide virtualization baseline Small Cell Virtualization Key Takeaways © Small Cell Forum Ltd 2015
  17. 17. Topic Findings What are the real business benefits of virtualization in the RAN? Identified centralization benefits, transport costs & MANO/Automation elastic scaling capabilities Are current small cell architectures well suited to virtualization? Yes - FAPI MAC/PHY decomposition well suited to provide virtualization baseline How do we ensure virtualization supports innovation across a multi- vendor ecosystem? SCF’s nFAPI work stream set to accelerate multi-vendor PNF/VNF interoperability Small Cell Virtualization Key Takeaways © Small Cell Forum Ltd 2015
  18. 18. Topic Findings What are the real business benefits of virtualization in the RAN? Identified centralization benefits, transport costs & MANO/Automation elastic scaling capabilities Are current small cell architectures well suited to virtualization? Yes - FAPI MAC/PHY decomposition well suited to provide virtualization baseline How do we ensure virtualization supports innovation across a multi- vendor ecosystem? SCF’s nFAPI work stream set to accelerate multi-vendor PNF/VNF interoperability Can virtualization deliver a phased roadmap, e.g., aligned with longer- term 5G directions? Yes - Flexible virtualization over non- ideal transport now emerging as core 5G requirements Small Cell Virtualization Key Takeaways © Small Cell Forum Ltd 2015
  19. 19. Small Cell Virtualization Key Takeaways © Small Cell Forum Ltd 2015

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