ONF SD-RAN: Open Source RIC, xApps & Integration with DU/CU - Prakash Siva, Head of Hardware & Cloud Engineering
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ONF SD-RAN: Open Source RIC,
xApps & Integration with DU/CU
Prakash Siva, Head of Hardware & Cloud Engineering
Aug. 31, 2020
Radisys Corporation - CONFIDENTIAL
Connect Open RAN
Integrating the Disaggregated Ecosystem with Open Framework
4G & 5G
Proven Scale & Expertise UE
Globally deployed and proven 300+ 4G/5G R&D Experts
Trillium software heritage Software and Prof. services Protocol
Software
Connect
Open RAN Leadership Open Contributions Open RAN
Leadership in in Open RAN communities Key open source contributions to O-RAN
O-RAN Alliance, OTIC, ONF, TIP Alliance, TIP, ONF
eNB/ gNB Software EPC/5GCN
Software Reference
(vRAN, cRAN, CU-DU) Implementation
Legacy 4G LTE Private
(SS7) 3G 5G NR MEC
Adv. Network
CA, NB IoT, CAT M1, LTE, CBRS, 5G mmWAVE, Sub-6 GHz
LAA, LWA
Radisys Corporation - CONFIDENTIAL 2
Telecom Ecosystem Contributions
4G & 5G UE
• xRAN API (RAN) Development Protocol
• Joint Solution with Intel® Software • ONF Partner; T-SAB, E-SAB Members
• ORAN defined APIs • SEBA, VOLTHA Contributions
• WG Participation • Exemplar Framework and Solution Integration
• Design and Specification contribution
Connect
Open RAN
Software
EPC/5GCN
eNB/ gNB Software Reference
(vRAN, cRAN, CU-DU) Implementation
• Lead TIP Type 1 Solution Integrator
• Contributor Member • Contribution of LTE and EPC to TIP
• FAPI eNB MAC – PHY Interface • Development for Open Cellular
• Small Forum API Development • Solution Integrator for Open-RAN
• nFAPI development Contributing Member • Solution Integrator for Virtual RAN Fronthaul
• 5G FAPI / nFAPI development • TIP Demo integrator for TIP Summit & MWC
• Observer Member • RAN#2 Meeting Plenary
• CBRS eNB, EPC Solutions • LTE eNB, EPC Solutions
• On.Go Test Platform for CBSD (A/B) • 5G gNB, UE and CN Solutions
Radisys Corporation - CONFIDENTIAL 3
O-RAN Leadership and Contributions: Aligned with SD-RAN
ACTIVE LEADERSHIP STRONG CONTRIBUTIONS
WG8 WG3
• Vendor co-chair along with Intel, AT&T and China Mobile • RIC architecture contributions
• Leader of TG2 and TG4 task groups • Active participant in E2 and service model definitions
• Major contributor of reference architecture spec
• Major contributor of Conformance and IOT specs
Drove Reference O-RAN Alliance architecture and interfaces
WG5
• Liaison from Small Cell Forum
OSC
• Active participant in O-DU M-plane definition
• Project Technical Lead, O-DU-High project
• Contributed O-DU seed code
• O-DU team contributing since 2019
WG6
• Joint contribution with Ciena on O-RAN edge optimization
Deep competence in O-DU architecture and orchestration
• Active participant in AAL API definition
TOC
• TOC member since April 2020 WG7
• 1 of the 3 vendors elected by the 6-member Operator body
to TOC alongside Ericsson and Nokia • Industry first O-RU reference design whitepaper
• Upcoming joint contribution on O-RU hardware reference
design
Part of the key decision-making committee
Radisys Corporation - CONFIDENTIAL 4
Contributions to SD-RAN: O-DU & O-CU Software
• Why Contribute to SD-RAN?
Radisys Software
Binaries
• Support for Disaggregation via O-RAN & 3GPP Split
options
• Software Defined – RAN programmable via near-RT RIC
(µONOS)
• Enable Flexible & Advanced RAN Operations
• Efficient orchestration and network automation
• Deployment models across Tower, Edge and Regional DCs
µONOS • Rapid Innovation via xApps
• RRM functions & Advanced RAN control capabilities
• Radio Optimization, Observability, Precoder, Channel
Prediction etc.
• Interfaces to Non-RT RIC
• AI/ML & Inferencing to support RAN Slicing (Service
Controlled via RIC/xApps assurance & KPI targets
• Radisys leadership in design & deployment of next-gen
RAN utilizing: COTS HW, Disaggregation, MultiVendor
Orchestration & Cloud Infrastructure
Radisys Corporation - CONFIDENTIAL 5
O-DU & O-CU: 3GPP & O-RAN Split Options
RRC RRC
PDCP PDCP
RLC RLC
DU
RU
CU
Radisys Corporation - CONFIDENTIAL 6
Cloud Native DU & CU Architecture + xApps
SMO (Orchestrator)
xApps
Radisys Corporation - CONFIDENTIAL 7
O-RAN Cloud Architecture
Source: O-RAN
Radisys Corporation - CONFIDENTIAL 8
O-DU: Deployment Models – Mgmt. & Cloud
Flat Hierarchical Hybrid
Cloud Deployment Models
• O-DU + O-RU @ Cell Site
• O-DU @ Edge Cloud
Source: O-RAN
Radisys Corporation - CONFIDENTIAL 9
Near-RT RIC: E2 & Use case Interaction
• Use cases defined in O-RAN.WG2.Use-
Case-Requirements
• Traffic Steering
• QoE
• QoS based resource optimization
• Context based dynamic handover for V2X
• Data required depends on specific use
cases
Traffic Steering Use Case
Source: O-RAN
Radisys Corporation - CONFIDENTIAL 10E2 Interface Functions in O-DU & O-DU
• E2 functions are grouped into the following categories
• Near-RT RIC Services & Support Functions
• NEAR-RT RIC Services
• REPORT: Request that E2 Node sends a message to Near-RT RIC
and the associated procedure continues in E2 Node after each
occurrence of a defined RIC Subscription procedure Event Trigger
• INSERT: Request that E2 Node sends an INSERT message to Near-
RT RIC and suspend the associated procedure in E2 Node after each
occurrence of a defined RIC Subscription procedure Event Trigger
• CONTROL: Control message to E2 Node to initiate a new associated
procedure or resume a previously suspended associated procedure in
the E2 Node
• POLICY: Request that E2 Node executes a specific POLICY during
functioning of the E2 Node after each occurrence of a defined RIC
Subscription procedure Event Trigger
• NEAR-RT RIC Support Functions:
• Interface Management (E2 Setup, E2 Reset, Reporting of General
Error Situations)
• Near-RT RIC Service Update, i.e. a E2 Node initiated procedure to
Source: O-RAN inform Near-RT RIC of changes to list of supported Near-RT RIC
services and mapping of services to functions.
E2AP & E2SM (Service Model)
Radisys Corporation - CONFIDENTIAL 11Control Loops & RAN Intelligent Controllers
Enrichment data from network management,
network functions and other sources
O-RAN Control Loops
Non Real Time Latency
Intelligence Layers
>> 1 sec
AI/ML Non-RT RIC Non real time RIC
• Service and policy management
• RAN analytics
• AI/ML inferencing & model
A1 training
Near Real Time Latency
Near RT RAN Intelligent Controller (µONOS)
Near real time RIC
• RAN control and optimization
10ms-1 sec xApp1 xApp2 xAppN • XApps for use cases
• UE and cell specific metrics
RAN Metrics Database
E2
Real Time Latency
< 10 ms CU CU and DU
• Real time actions
F1 • Resource management
E2 • Radio scheduling
DU
O-RAN Fronthaul
RU O-RAN Arch. Components
12Thank You Radisys Corporation - CONFIDENTIAL 13
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