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Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
IEEE Globecom 2019 December 11, 2019
Sifat Ferdousi1, Massimo Tornatore1,2, Sugang Xu3, YoshinariAwaji3, and Biswanath Mukherjee1
1University of California, Davis, USA 2Politecnico di Milano, Italy 3National Institute of Information and Communications Technology, Japan
Session: ONS3: Intelligent Optical Networks
Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Introduction
User demands and services are evolving…
A new generation of optical metro networks is needed to turn the vision of “Smart Cities” into reality
• From a rigid ring-based aggregation infrastructure to a composite network-and-computing ecosystem to support next-generation 5G services
• Several technical enablers: Increased reconfigurability enabled by SDN Integration of optical and wireless access networks Metro nodes becoming edge data centers (edge computing) Network slicing to logically partition network, computing, and storage resources …
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Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Metro-Access Networks
User demands and services are evolving…
so is the network
• 75% of total metro traffic is terminated within the metro network, as video, data and web content is increasingly generated at the metro networks
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Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Evolution of Metro-Access Networks
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Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
coreMAN
Edge DCMetro core node
Access node Base Station Fixed access (xDSL/cable/FTTx)
Metro nodeCore node Core DC Controller
Control PlaneEdge computing and SDN
Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Evolution of Metro-Access Networks
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Control Plane
Data Plane
uRLL
C Sl
ice
eMBB
Slic
ePh
ysic
al In
fras
truc
ture
Virt
ual s
lices
are
map
ped
on p
hysi
cal r
esou
rces
Cont
rol p
lane
par
titio
ns th
e da
ta p
lane
for d
iffer
ent s
lices
Disaster affecting underlying infrastructure
This transformation calls for trustworthy, high-availability, and sliceable next-generation metro-area networks that are resilient
against disasters
Network Slicing
Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Recovery for Metro-Access Networks
• Post-disaster recovery in metro access is different from that in core networks • Too expensive for disaster resiliency • Much less redundant than core
• After disaster, utmost priority: minimize service downtime (recover network asap)• Slice re-provisioning may not be possible with available resources and considering
locality of services• Control plane managing the slices can also be affected by disasters
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Utilize equipment for "temporary relief/service" only in case of disaster instead of preplanning lot of redundant capacity
Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
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Rapid network recovery with deployable recovery units
• In the post-disaster phase, recovery trucks can provide bothrepair and temporary relief/service while repair work is going on(unlike general network recovery)
– How to route the recovery trucks? – Where to deploy the recovery trucks? – When to deploy the recovery trucks and for how long?
“Slice-aware” routing and deployment strategy to minimize downtime penalty and ensure fast restoration of important slices.
Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Slice-Aware Service Restoration
• Model the problem based on classical vehicle routing problem
• Recovery trucks provide both repair and temporary relief/service while repair work is going on (unlike general network recovery)
• Develop a “slice-aware” routing and deployment strategy for heterogeneous recovery trucks to heterogeneous failure sites
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Minimize downtime penalty - fast restoration of important slices
Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Slice-Aware Service Restoration with Recovery Trucks
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DC 1
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MN 1
AN 1
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AN 8
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FA 1
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Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Slice-Aware Service Restoration with Recovery Trucks
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DC 1
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Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Slice-Aware Service Restoration with Recovery Trucks
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DC 1
DC 2
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MN 1
AN 1
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AN 3
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AN 6 AN 9
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14 1516
17 Distance – travel time
Slice priority
Recovery time
Vehicle type
Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Slice-Aware Service Restoration with Recovery Trucks
• Given: network topology, set of network slices, set of failed nodes, set of
heterogeneous trucks
• Output
• Routes for recovery trucks
• Objective: Minimize service disruption penalty of slices
• Solution Approach• Mathematical model (MILP)
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Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Compared schemes
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Post-disaster recovery
• Deployment schemes to be compared
• Slice-aware service restoration with temporary service (minimize penalty)• Slice-unaware service restoration with temporary service (minimize travel
time)• Slice-aware service restoration without temporary service (repair only)
Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Simulation Setup
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Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Results
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29% savings in penalty 38% savings in penalty
Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Results
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60% reduction in service disruption penalty 46% service-restoration time savings
Globecom 2019 Ferdousi et al. - Slice-Aware Service Restoration with Recovery Trucks for Optical Metro-Access Networks
Conclusion
• Our slice-aware service-restoration approach can achieve significantreduction in service-disruption penalty and savings in service-restoration time in a post-disaster optical metro-access networks
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