Challenges on new control services for transport networks Raul - - PowerPoint PPT Presentation

Challenges on new control services for transport networks

Raul Muñoz

Head of Optical Networks and Systems Department Centre Tecnològic de Telecomunicacions de Catalunya (CTTC/CERCA), Castelldefels, Spain.

2nd Visions for Future Communications Summit, 27th, 28th November 2019

2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon

Evolution of optical networks: towards disaggregation

2

First disaggregation (2015)

Vendor domain controller Transport SDN controller

Open APIs

Vendor domain controller

Open APIs vendor A Island (Line System+Terminals) BW service IP router IP router vendor B Island (Line System+Terminals)

Partially disaggregated (~2020)

Open Line System (OLS) vendor A

OLS controller Transport SDN controller OLS controller

Open Terminal vendors (D,E,F) Open APIs Open APIs Open APIs Open APIs Open Terminal vendors (D,E,F) Spectrum service Open Line System (OLS) vendor A

Fully disaggregated (open systems) (~2025)

Open ROADM vendor A Open APIs Open APIs Open APIs Open Terminal vendors (D,E,F) Open Terminal vendors (D,E,F)

Transport SDN controller

Open ROADM vendor B Open ROADM vendor A Open ROADM vendor B

Fully disaggregated (open subsystems) (>2030)

Transport SDN controller

Open APIs Open APIs

OA

SSS

SSS

Open ROADM Multi-vendor (D,E,F) Open APIs

Filter

Laser

DSP

Open Terminal Multi-vendor (G,H,I) Controller Controller

Filter

Laser

DSP

Open Terminal Multi-vendor (A,B,C) Controller Open APIs Open APIs Open APIs

2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon

Evolution of the optical spectrum: towards virtually infinite spectrum

▪ Single-mode fibers have already reached it physical limit.

3

Yutaka Miyamoto and Ryutaro Kawamura, Space Division Multiplexing Optical Transmission Technology to Support the Evolution of High-capacity Optical Transport Networks, https://www.ntt- review.jp/archive/ntttechnical.php?contents=ntr201706fa1.html

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Marker 267 µm

2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon

Challenge #1: Full programmability

▪ Fully optical disaggregation network are a clear use case for:

▪ open interfaces ▪ Programmability

▪ They require the adoption of unified and systematic information and data modelling

for the optical systems and subsystems.

▪ Target optical systems and subsystems are particularly challenging to model due to

the lack of agreed-upon hardware models:

▪

Critical for an interoperable ecosystem, in spite of cross-vendor initiatives that do not cover advances in optical devices.

▪ Hard to reach consensus for OpenROADM, OpenConfig.

4

2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon

Challenge #2: Large scale network Telemetry and data analytics

▪ Optical transports networks suffer from physical layer impairments that degrade the

quality of the optical analog signal.

▪ Failures can be generated by equipment malfunctioning or ageing, interferences due

to new connections, or maintenance tasks.

▪ It is key to include support for large scale monitoring/telemetry from heterogenous

• ptical systems/sybsystems to support SDN controller, enabling:

▪ Local data collection points ▪ Data analytics (e.g. AI) to recommend network reconfiguration actions. ▪ Autonomous control loops for network continuous optimization.

5

2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon

Challenge #3: Infinite spectrum service management and virtualization

▪ Disaggregated optical networks are not just providing capacity services (in Gb/s) but

also spectrum services (in GHz).

▪ On the other hand, the increase in the available bandwidth thanks to the spatial

dimension (i.e., core and modes) justifies the adoption of network sharing and virtualization.

▪ It allows to generate new business opportunities and services similar to the radio

spectrum:

▪ The optical spectrum can be “licensed” to new actors that can access to the allocated portion of

the spectrum using their own optical terminals.

6

2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon

Challenge #4: Novel SDN architectures ensuring reliability, security and robustness.

▪ From the control plane perspective, neither a fully distributed nor a fully centralized

architecture fits for all use cases and scenarios:

▪ e.g., centralized monitoring and telemetry does not scale.

▪ Fully disaggregated optical networks require the adoption of local network element

controllers to distribute some control functions of the centralized SDN controller to the nodes, deploying hybrid approaches:

▪ considering distributed elements with data analytics and local control loops

▪ Mechanisms for trusted services in order to ensure that the Transport SDN

controllers in a multi-domain environment underlying optcal devices are all trusted entities that are operating as they should.

7

2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon

Challenge#5: Adaptive cross-layer connectivity service

• rchestration

▪ Optical transport networks must be seamless integrated with IP networks (packet)

in order to provide a highly flexible connectivity infrastructure that can :

▪ dynamically adapt to changing requirements of innovative applications (i.e., connectivity services

automatically trigger optical connectivity services when required)

▪ Support large-scale management of flows with dedicated QoS. ▪ IP routers can also deploy integrated transponders and request spectrum services to the optical

transport network.

8

Transport SDN controller

Open API

IP controller

Optica Transport Network Router IP Router IP

2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon

Challenge #6: Advanced orchestration of Edge computing and optical transport resources

▪ Computing resources are required to be distributed at the network edge towards a

perceived zero latency

▪ Distributed edge computing nodes with optical interfaces requiring seamless and

secure end-to-end orchestration between computing and transport resources.

9

Edge Computing controller

vendor A Transceiver Open ROADM Open Terminal Open Api Open API

SDN controller NFV Service Platform

Open API

2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon

Challenge #7: Integration of QKD and disagregated

• ptical transport networks

▪ Quantum key distribution (QKD) devices are commercially available. It allows the

creation of security keys at the ends of a quantum channel.

▪ The co-propogation of quantum signals with optical (WDM) signals is very difficult,

since the optical transport networks were not designed to fulfill the requirements.

▪ Disaggregated optical transport networks and SDN programmability can provide a

level of flexibility that allows to meet the requirements needed to transmit quantum- level signals.

10

Transport SDN controller QKD QKD

Thank you!

11

Raul Muñoz Raul.munoz@cttc.es

.