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
Evolution of optical networks: towards disaggregation First disaggregation (2015) Partially disaggregated ( ~ 2020) Spectrum BW Transport SDN controller Transport SDN controller service service Open APIs Open APIs Open APIs Open APIs Open Open APIs APIs Vendor domain controller OLS controller OLS controller Vendor domain controller IP IP vendor A Island Open Terminal Open Terminal Open Line System vendor B Island Open Line System router router (Line System+Terminals) vendors (D,E,F) vendors (D,E,F) (OLS) vendor A (OLS) vendor A (Line System+Terminals) Fully disaggregated (open subsystems) ( > 2030) Fully disaggregated (open systems) ( ~ 2025) Transport SDN controller Transport SDN controller Open APIs Open APIs Open APIs Controller Controller Controller Open Open Open APIs Open APIs Open APIs APIs APIs Open APIs DSP SSS DSP Laser SSS Laser Filter OA Filter Open Open Open Open Open Terminal Open Terminal Open ROADM Open Terminal ROADM Open Terminal ROADM ROADM ROADM Multi-vendor Multi-vendor Multi-vendor vendors (D,E,F) vendor A vendors (D,E,F) vendor B vendor A (A,B,C) vendor B (G,H,I) (D,E,F) 2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon 2
Evolution of the optical spectrum: towards virtually infinite spectrum Marker 1 2 12 3 ▪ Single-mode fibers have already reached it physical limit. 13 14 11 4 18 19 15 10 5 17 16 9 6 8 7 267 µm 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 2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon 3
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. 2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon 4
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 optical 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. 2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon 5
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. 2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon 6
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. 2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon 7
Challenge#5: Adaptive cross-layer connectivity service orchestration ▪ 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. IP controller Open API Transport SDN controller Router IP Router IP Optica Transport Network 2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon 8
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. NFV Service Platform Open API SDN controller Edge Computing controller Open API Open Api Open Terminal Open vendor A ROADM Transceiver 2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon 9
Challenge #7: Integration of QKD and disagregated optical 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. Transport SDN controller QKD QKD 2nd Visions for Future Communications Summit, 27-28 November 2019, Lisbon 10
Thank you! Raul Muñoz Raul.munoz@cttc.es . 11
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