SCF Partners' Day: Introduction to XRAN
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This document discusses the evolution of radio access network (RAN) architectures from vertically integrated vendor-specific designs to next generation standardized architectures with decoupled control and user planes. It proposes standardized northbound and southbound interfaces to enable multi-vendor RANs and programmable control functions. Proof of concept demonstrations show how a RAN controller can manage applications through these interfaces for load balancing, hybrid scheduling, and network slicing. The forum aims to drive standardization through operator-led collaboration between vendors and standards bodies like 3GPP and ONAP.
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SCF Partners' Day: Introduction to XRAN
- 1. F O R U M
- 2. A BRIEF HISTORY 2016 2017
- 4. Control Functions User Plane Applications EXISTING RAN ARCHITECTURE VERTICALLY INTEGRATED, VENDOR SPECIFIC
- 5. NEXT GENERATION STANDARD RAN ARCHITECTURE Control Functions User Plane Applications DECOUPLED CONTROL PLANE AND USER PLANE
- 6. NEXT GENERATION STANDARD RAN ARCHITECTURE Control Functions User Plane Applications Standardized Northbound Interfaces Standardized Southbound Interfaces STANDARDIZED NORTH AND SOUTHBOUND INTERFACES
- 7. NEXT GENERATION STANDARD RAN ARCHITECTURE Control Functions Applications Standardized Northbound Interfaces Standardized Southbound Interfaces STANDARDIZED NORTH AND SOUTHBOUND INTERFACES RLC MAC PHY Local Control (Lower) PDCP RRCLocal Control (Higher)
- 8. NORTHBOUND INTERFACES Control Functions Applications Standardized Northbound Interfaces Standardized Southbound Interfaces RRH Modular EnodeB OpenInterfaces Traditional RAN Platforms Application Intent 1 Applications Controller SB Interface NB Interface What How
- 9. NORTHBOUND INTERFACES Control Functions Applications Standardized Northbound Interfaces Standardized Southbound Interfaces RRH Modular EnodeB OpenInterfaces Traditional RAN Platforms Application Intent Example 1Load-based Connectivity Management Application Intent: In cases where signal strength is sufficient on two or more cells, manage connectivity to balance load across available cells. SIGNAL SIGNALLOAD LOAD Controller Logical View Northbound Interfaces Southbound Interfaces Logic and Decision Control and State RAN Infrastructure
- 10. NORTHBOUND INTERFACES Control Functions Applications Standardized Northbound Interfaces Standardized Southbound Interfaces RRH Modular EnodeB OpenInterfaces Traditional RAN Platforms Application Intent Example 1Load-based Connectivity Management Application Intent: In cases where signal strength is sufficient on two or more cells, manage connectivity to balance load across available cells. SIGNAL SIGNALLOAD LOAD Controller Logical View Northbound Interfaces Southbound Interfaces Logic and Decision Control and State RAN Infrastructure
- 11. NORTHBOUND INTERFACES Control Functions Applications Standardized Northbound Interfaces Standardized Southbound Interfaces RRH Modular EnodeB OpenInterfaces Traditional RAN Platforms Interact with Operational Management System (e.g. ONAP) 1 Applications Controller SB Interface NB Interface Management Systems Logic and Decision Control and State
- 12. RADIO ACCESS NETWORK CONTROLLER ARCHITECTURE Control Functions Applications Standardized Northbound Interfaces Standardized Southbound Interfaces RRH Modular EnodeB OpenInterfaces Traditional RAN Platforms 2 Controller Modularity Applications Controller SB Interface NB Interface
- 13. MOVING THE 3GPP TOWARD 5G SD RAN RRU DU CU RRU DU CU-CP CU-UP 3GPP Split Option 2 (PDCP/RLC split) 3GPP Split Option 2-2 study (control plane / user plane split) E1F1F1 RRU DU CU-CP(L) CU-UP Option 2-2 study w/ interoperable B1 XRAN.ORG compliant E1F1 CU-CP(H) B1 A1 ONAP A1 ONAP 3GPP eNB RRH BBU 5G AT&T’s target 5G CP decoupling 3GPP Rel 15 5G 3GPP consensus & target 3GPP Rel 15 3GPP LTE
- 14. SOUTHBOUND INTERFACES Control Functions Applications Standardized Northbound Interfaces Standardized Southbound Interfaces RRH Modular EnodeB OpenInterfaces Traditional RAN Platforms 3 Managing Complexity Controller SB Interface RAN Maintains Logical Network State Executes intent messages, through message exchange, as defined by the SB API (Eg. Handoff)
- 15. SOUTHBOUND INTERFACES Control Plane Applications Standardized Northbound Interfaces Standardized Southbound Interfaces RRH Modular EnodeB OpenInterfaces Traditional RAN Platforms 3 Managing Complexity Controller SB Interface RAN Maintains Logical Network State Executes intent messages, through message exchange, as defined by the SB API (Eg. Handoff) PDCP RLC MAC PHY RF RRC CF-ru (Lower) CF-ru (Higher) RLC MAC PHY CF-ru (Lower) RLC MAC PHY CF-ru (Lower) PDCP RRC CF-ru (Higher) PHY RF RF RF Standardized Southbound Interfaces Control Functions Standardized Northbound Interfaces
- 17. LOAD BALANCING HANDOFF Application Intent: In cases where signal strength is sufficient on two or more cells, manage connectivity to balance load across available cells. SIGNAL LOAD SIGNAL LOAD 1 2 A B Application SB Interface Controller NB Interface RAN Logic and Decisions Control and State
- 18. HYBRID SCHEDULING Application Intent: In cases where a UE is at the edge between two cells and each cell is using the same <resource pool>, push scheduling policy to both cells to eliminate inter-cell interference. RESOURCE ALLOCATION 1 2 A B 0 50 100 RESOURCE ALLOCATION 0 50 100 Application SB Interface Controller NB Interface RAN Logic and Decisions Control and State
- 19. RAN SLICING PUBLIC SAFETY Application Intent: Manage RAN resources to deliver deterministic service levels to different classes or types of RAN services or subscribers. Slice Profile includes: • Stitched EPC Slice • Supported eNBs • Supported UEs • Availability periods • Resource allocations • Handoff parameters • Admission control policies • SON policies • Link aggregation policies PRIVATE LTE QOS GUARANTEES MVNO
- 20. UNIFIED OPERATOR DRIVEN APPROACH COLLABORATIVE VENDOR DEVELOPMENT OPERATOR TRIALS UNIFIED OPERATOR STANDARDS PROPOSAL STANDARDS BODY RATIFICATION UNIFIED OPERATOR REQUIREMENTS 1 2 3 4 5
- 21. ACHIEVEMENTS Oct 2016 Feb 2017 Aug 2017 NGMN Frankfurt MWC Barcelona MWC San Francisco • Forum Announced • Demonstrated Decoupled Control Plane • Demonstrated Multi-Vendor Applications - Load Balancing - Hybrid Scheduling • Membership Momentum • ONOS Integrated Controller • New Applications • Member Growth • Operator Trials
- 22. COLLABORATION BETWEEN XRAN AND SCF Three axes: • Interfaces: Leverage work in both bodies on different split options and interface definitions and harmonize them • Densification Architecture: Collaborate on scalable densification architectures, xRAN’s focus has primarily been on macro cell and CRAN-like architectures, complements SCF • Standards: Help drive a unified set of standards via operators and vendors to 3GPP for 5G
- 23. F O R U M