BlueSPACE s SDN/NFV Architecture for 5G SDM/WDM-enabled Fronthaul with Edge Computing

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1 Building on the use of Spatial Multiplexing 5G Network Infrastructures and Showcasing Advanced Technology and Networking Capabilities 5GPPP Research and Innovation Actions EUCNC 2018 Ljubljana, Slovenia June BlueSPACE s SDN/NFV Architecture for 5G SDM/WDM-enabled Fronthaul with Edge Computing Raul Muñoz, Ricard Vilalta, Josep M. Fàbrega, Laura Rodríguez, Ricardo Martínez, Ramon Casellas CTTC Giada Landi, Marco Capitani - Nextworks

2 The BlueSPACE Project approach 2 A complementary solution to the 5G C-RAN (functional split) under investigation in the BlueSPACE project to reduce the bandwidth requirements is to use analog radio over fibre (ARoF) transceivers: The radio waveforms are directly modulated onto light for connecting BBUs and RRHs. It can be used in combination with digital RoF solutions for the 5G NGFI Additionally, the BlueSPACE project also considers to include spatial division multiplexing (SDM) for further increasing the network capacity in the fronthaul: It can be deployed with bundles of single mode fibers or multicore optical fiber. SDM can also be used to power the cell sites using Power of Fiber (PoF) devices. The BlueSPACE network architecture also deploys edge computing in the central office for NFV and MEC applications (e.g. video analytics, data caching).

3 BlueSPACE s network architecture Cell site A MCM 1 RU Three-sector 1 frequency Central Office Spatial channels 3 5 RU RU 6 25GB/s 6 cores / fibres VNF Optical Metro Network MEC Ethernet Switching and aggegation (ES) Edge Computing Pool of BBUs/DUs BBU BBU BBU DU DU DU IF (Analog) IF switching and aggregation (IFS) NGFI-I (ecpri) Packet switching and aggregation (PS) Pool of ARoF, and PoF T ARoF ARoF PoF Tx PoF Tx PoF Tx Optical Switch (OS) M Optical Switch (OS) SSS 1 1 M 1 Bundles of SMF or MFC N SDM/WDM ODN Cell site D IF Multiplexing Cell site C Packet Multiplexing Cell site B Spectral channels MCM or SSS/AWG MCM or SSS/AWG A SSS/AWG IFS RU RU RU PS RRH RRH RRH RU RU RU Three-sector 1 frequency Three-sector 1 frequency Three-sector 1 frequency 6 different 25GB/s 1 fibre 2 75GB/s 1 fibre/core 2 wavelength 1 fibre/core 3

4 Building on the use of Spatial Multiplexing 5G Network Infrastructures and Showcasing Advanced Technology and Networking Capabilities 5GPPP Research and Innovation Actions BlueSPACE s NFV MANO architectural framework

5 BlueSPACE s NFV MANO extended functionalites The BlueSPACE project proposes to extend the ETSI NFV MANO architecture with the following features that are not currently supported: SDN control of SDM/WDM/Packet network : provisioning of spatial/spectral connections and discovery of resources and network topology in SDM/WDM-enabled fronthaul network and Backhaul/NGFI packet-based network. Management of PNFs: management of PNFs (mainly physical RRUs and BBUs) together with VNFs, as part of NFV network services for mobile communications. Integration with MEC: provisioning and management of MEC Applications in NFV network services, exploiting the computing/storage resources of edge nodes co-located with the Central Office. Multi-tenancy support (Network Slicing) : multi-tenancy and network slicing are adopted to to optimize the usage of the physical infrastructure through virtualization and resource sharing techniques, while guaranteeing high levels of flexibility in the provisioning of dedicated services with customized QoS. Joint resource allocation algorithms: development of algorithms for NFV network service and network slices that performs joints allocation of network, cloud, VNF/MEC and PNF resources. Integration of PoF: Provisioning and Management of PoF devices and spatial channels, as well as the configuration and monitoring of the devices connected to the PoF system (e.g., Batteries, etc). 5

6 BlueSPACE TRANSPORT SDN CONTROLLER BlueSPACE NFV SERVICE PLATFORM BlueSPACE SLICE MANAGER BlueSPACE s MANO architecture Network slice template (NST) Network slice instance (NSI) C & R Network Sclicing Manager (NSM) nsm-os Or-Nsm Network services descriptors, VNF Packages and PNF descriptors. NS, VNF and PNF instances NFVI resources C & R MEC-enabled NFV Orchestrator (NFVO) NFV NS allocation algorithms Or-pnfm Or-vnfm SDM/WDM/Packet resources XHAUL Topology TED wi-wi Or-wi (TAPI) XHAUL Transport SDN Controller (WIM) wi-wi PNF Manager PNF (PNFM) Manager Manager (PNFM) (PNFM) Or-Vi VNF Manager VNF Manager (VNFM) (VNFM) Vi-Vnfm Ve-Vnfm Optical FH Transport SDN Controller wi-ag wi-ag BH/NGFI Transport SDN Controller IF FH SDN Controller Pe-Pnfm Edge computing Controller (VIM) C&R CO Node SDN CS FH Node CS FH Node CS Node SDN VNF/VM Images Nf-wi-op Nf-wi-pa Nf-vi-ec VNFs and MEC applications ARoF T PoF T OS/SSS PS Control IF Switch OBFN RRH/RU BBU/DU MEC VNF 6

7 Building on the use of Spatial Multiplexing 5G Network Infrastructures and Showcasing Advanced Technology and Networking Capabilities 5GPPP Research and Innovation Actions BlueSPACE Transport SDN controller

8 BlueSPACE s SDN control requirements To develop a transport SDN solution to control the SDM/WDM-enabled fronthaul network and packet-based network segments: A single SDN controller comprising the multiple and diverse technologies of the SDM/WDM-based fronthaul and packet-based backhaul is not realistic. Traditionally, network operators fragment their networks into multiple administrative domains for scalability, and security purposes To integrate the developed Transport SDN control solution with the NFV MANO framework to provide NFV network services: Current NFV MANO framework considers the network as a commodity that provides packet pipes with QoS. It can be dynamically provisioned between the specified end-points. Currently, the interface with the Transport SDN defined by the ETSI NFV MANO framework is still lacking of maturity. 8

9 BlueSPACE Transport SDN controller We rely on a hierarchical Transport SDN control approach with different levels of hierarchy (parent/child architecture): Several SDN controllers (child WIMs) for the fronthaul, backhaul and NGFI-I segments. Another SDN controller on top (parent WIM) acting as the Xhaul transport network controller. The child WIM for the packet network segment is based on a regular SDN controller using OpenFlow or P4 runtime protocols as SBI to configure the packet switches. On the fronthaul segment side, the proposed solution is to deploy SDN agents at the cell sites and the CO. The SDN agent s purpose is to map high-level operations coming from the child SDN controller into low-level, hardware-dependent operations. The child WIMs NETCONF as SBI with the SDN agents and ONF TAPI with the parent WIM. 9

10 Hierarchical Transport SDN controller NBI (TAPI) XHAUL Transport SDN Controller TAPI TAPI TAPI TAPI NGFI-I SDN Controller Backhaul/NGFI-II SDN Controller RF Fronthaul SDN Controller Optical Fronthaul SDN Controller NETCONF NETCONF NETCONF SDN CO Node SDN CS Node SDN CS Node OpenFlow/P4 RESTAPI ARoF OS/SSS PoF ARoF PoF SSS/AWG PoF Proprietary Interfaces ARoF PoF Tx ARoF PoF Rx PoF Rx ARoF PoF Tx ARoF 10

11 Building on the use of Spatial Multiplexing 5G Network Infrastructures and Showcasing Advanced Technology and Networking Capabilities 5GPPP Research and Innovation Actions NFV SERVICE PLATFORM and VIM

12 BlueSPACE NFV service platform The BlueSPACE NFV service platform extends the traditional NFVO and VNFM concepts in order to support the: Integrated provisioning and management of MEC Applications in NFV network services, exploiting the computing/storage resources of edge nodes co-located with the Central Office. Integrated management of PNFs (mainly physical RRUs and BBUs) as part of NFV network services for mobile communications. Joint allocation of computing and networking resources, with embedded configuration of the multi-layer and multi-technology transport network as part of the resource orchestration procedures. The implementation of these three features has a transversal impact in all the considered components, from the NFVO down to the VIM and it requires the introduction of additional functional entities. 12

13 Orchestration of MEC Applications The BlueSPACE NFV service platform and VIM need to support the following enhanced features: At the NFVO level: service orchestration of MEC Apps lifecycle, including the discovery of existing MEC services and the registration of deployed MEC Apps in specific Mobile Edge Hosts. management of an extended NFV-NS catalogue (NFV-NS descriptor with embedded MEC Apps - NFV/MEC-NS, as well as and MEC Apps descriptors - AppD. resource orchestration algorithms able to handle MEC-related constraints. NFVI database extended with MEC-related information, e.g. positioning of Mobile Edge Hosts and availability of MEC services extension of the NFV-NS instantiation procedures to integrate the configuration of traffic rules for the traffic steering among MEC Apps. At the VIM level: support of programmable APIs for the configuration of network routing between MEC Apps at the Mobile Edge Host and advertisement of additional characteristics and capabilities 13

14 Management of PNFs The BlueSPACE NFV service platform and VIM need to support the following enhanced features: The NFVO should include a dedicated catalogue and record for PNFDs and PNF instances. The current PNFD should be extended to describe specific constraints. The reference point between NFVO and VIM should be extended in order to advertise the PNFs deployed in the NFVI. The NFVO Service Orchestration function should be able to distinguish between VNFs and PNFs, NFVO Resource Orchestration function, the resource allocation algorithms should be able to support PNF-related constraints. A new component, called PNF Manager (PNFM), should be introduced in the BlueSPACE architecture. This component should provide functionalities similar to the VNFM, but applicable to PNFs instead of VNFs. A new component, called PNF, should be introduced in the BlueSPACE architecture as a driver to interact with specific PNFs. 14

15 Functional architecture of BlueSPACE NFV service platform and VIM 15

16 Building on the use of Spatial Multiplexing 5G Network Infrastructures and Showcasing Advanced Technology and Networking Capabilities 5GPPP Research and Innovation Actions NETWORK SLICE MANAGER

17 Network Slice Manager - functionalities Processing of requests for network slice instances translation between QoS/service requirements and slice characteristics in terms of resources Translation of network slices into the corresponding set of NFV-NS instances, handling the mapping between: network slice QoS characteristics and deployment flavors of the corresponding NFV-NS instance network slice subnets decomposition and associated nested NFV-NS instances (opt) functional components of the network slice and associated VNFs in the NFV-NS instances Maintenance of catalogue for network slice template and record for instances Management of slice multi-tenancy, keeping the association with between customers and tenants. Handling of decisions about network slice decomposition and sharing of slice subnets. Management of network slice lifecycle and coordination with NFV NS lifecycle Monitoring of network slice status 17

18 Network Slice Manager functional architecture 18

19 Conclusions The BlueSPACE project proposes Spatial Division Multiplexing (SDM) as the key technology to overcome the capacity crunch that the conventional optical single-mode fibers (SMFs) are facing to accommodate the increasing bandwidth demands forecasted for 5G mobile communications in the fronthaul network. The combination of SDM with flexi-grid DWDM enables to exploit both dimensions (spectral and spatial resources) in combination with analog and digital Radio over Fiber (RoF) techniques. Additionally, BlueSPACE also considers the deployment of edge computing for MEC applications and VNFs. This paper has presented the challenges and architectural solutions proposed to enhance the ETSI NFV MANO framework in order to meet the functionalities considered in BlueSPACE. 19

20 Building on the use of Spatial Multiplexing 5G Network Infrastructures and Showcasing Advanced Technology and Networking Capabilities 5GPPP Research and Innovation Actions Thank you! Questions?