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Grant agreement n°318514
SDN architectures for orchestration of mobile cloud services with converged control of
wireless access and optical transport network
Giada Landi - Nextworks
Future Internet Assembly – Transport Software Defined NetworkingAthens (Greece), 20 March, 2014
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Cloud services for mobile and fixed users bring new challenges in network communications
End-to-end connectivity spanning from the wireless access to the metro network interconnecting geographically distributed Data Centres– Tailored to the cloud service dynamicity and QoS requirements
– Able to address the multi-domain and multi-technology segmentation through integrated solutions
The CONTENT vision– Converged heterogeneous virtual infrastructures integrating a novel
optical metro and wireless access technologies to interconnect end-users and Data Centres
– Multi-domain control plane to guarantee end-to-end QoS performance and allow efficient cloud-net orchestration
SDN paradigm as a fundamental enabler for cross-domain network virtualization, control and service orchestration
Motivations
Heterogeneous network infrastructure for user-to-DC connectivity…– Advanced optical metro with sub-wavelength switching granularity
– LTE access supporting user mobility through wireless backhauling
… shared among multiple converged Virtual Infrastructures … – Provided on-demand to virtual operators through cross-domain virtualization
… operated through an SDN-based control layer for end-to-end cloud+net service orchestration and delivery
CONTENT vision
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CONTENT layered architecture
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Heterogeneous Physical Infrastructure Layer – Wireless (LTE/WiFi) access integrated with a TSON metro network
interconnecting distributed Data Centres
Infrastructure Management Layer – Cross-domain virtualization
orchestrated resource abstraction resource management and virtualization of physical resources across
heterogeneous network domains
Control Layer– Provisioning of cloud and mobile cloud network services
seamless delivery of end-to-end connectivity across heterogeneous technology domains
– Support for optimized performance QoS guarantees, QoE requirements, resource efficiency and sustainability
Service Orchestration Layer– Efficient coordination and composition of cloud resources and network
services for end-to-end delivery of QoS-guaranteed Cloud services
Architecture layers
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Control layer (CL) decoupled from the physical layer– Operates the Virtual Infrastructure through open & vendor-independent i/fs
Two hierarchical levels– Per-domain CL: control of technology-specific domains
– Cross-domain CL: provisioning of E2E multi-layer network services
Per-domain control– Provides basic connectivity services in the wireless and TSON segments
– Based on SDN controllers basic functions: configuration, control and measurements
Cross-domain control– Provides E2E connectivity customized for the mobile cloud services
– Operates through the abstracted services exposed by TSON and wireless CPs
CONTENT control layer
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SDN solution for the Virtual Infrastructure Control Layer
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A converged wireless/TSON SDN controller– Operates the entire virtual infrastructure
Dedicated south-bound drivers for each technology Able to control single nodes or entire abstracted domains relying on
legacy control planes
– Provides elementary functions dedicated to the specific domains (wireless vs TSON) Resource configuration, monitoring, intra-domain connection setup &
tear-down, topology services
– Based on a generalized information model Per-domain specializations to deal with technology constraints
Provides a unified environment to build customized “enhanced” net apps– Re-use or replacement of the SDN controller basic functions
An SDN controller forintra-domain network connectivity
Resource control with TSON drivers– OpenFlow with TSON extensions for
control of single devices
– MNI/UNI drivers to manage TSON domains controlled through a legacy GMPLS CP
Topology service– Modelling of TSON characteristics and
constraints, e.g. time-slot availability
Statistics service– About TSON resources and service
performance
Connection service– Pro-active and on-demand setup of
metro connectivity services, including modification and recovery functions
SDN controller: TSON functions
Resource control– Driver to control virtual radio resources
– OF driver to control the virtual L2 wireless backhaul network
Topology service– Modelling of the virtual wireless access
network, e.g. wireless spectrum utilization, wireless backhaul capabilities, etc.
Statistics service– Wireless monitoring and
measurements
Connection service– Intra-domain connectivity services,
managed at the lower-layers through the SFA/OMF framework.
SDN controller: wireless domain functions
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End-to-end multi-layer connectivity services– Setup, tear-down, modification and monitoring
– Expose interfaces towards the Service Orchestration Layer
– Customized for cloud-oriented requirements
– Enables advanced cooperation between control and orchestration layers Beyond pure client-server interactions, towards an ABNO-oriented cloud-to-
network cooperation
Internal management and optimization of the Virtual Network Infrastructure– Stand-alone services or supporting the provisioning apps
– Both per-domain and cross-domain scope
– Considers the overall traffic, independently on the specific service instance
Enhanced network apps for cross-domain connectivity
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Enhanced net apps: some examples
SDN controller
Mobility manager
TSON virtual topology mgr
E2E Path computation
E2E Monitoring
E2EProvisioning
Wireless/TSON orchestration
ABNOnet controller
Appl. oriented net queries
VI N
etw
ork
Cont
rol L
ayer
End-to-end Cloud+Net Service Orchestrator
Basic network functions
Enhanced network functions TSON PCE
+ SLAE
SDN controller Northbound i/f
Enhanced net function i
Xj
Xi Network app for E2E connectivity
Network app for VI optimization
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Decoupling between control plane and data plane– Control plane operating on a “programmable” and heterogeneous virtual
infrastructure
– Vendor-dependent details (specific protocols and i/fs) fully hidden
– Abstracted resource capabilities exposed through open and unified interfaces Synchronization, configuration and monitoring actions
Control plane customizable for service layer requirements– Wireless and TSON domains managed through lower-layer control frameworks
Basic intra-domain services addressing the specific technology constraints Act as generic SDN controllers offering simple network service primitives
– Specialized cross-domain network applications on top of the controllers Cloud-oriented functions integrated with the service layer orchestration
Conclusions:SDN approaches in CONTENT architecture
