Page 118 - ITU-T Focus Group IMT-2020 Deliverables

3 ITU-T Focus Group IMT-2020 Deliverables

available today or tomorrow. Same applies also for the comparison with the 5GEx software architecture
which it is aiming at cross-domain orchestration of services over multiple administrations or over multi-
domain single administrations: in fact, being the "generalized" orchestration space based on an highly
distributed framework of orchestrators (basically in peering) the resulted level of flexibility and extensibility
is maximised with respect to traditional hierarchical approaches.

6.3.1.3 Demo of a prototype of the generalized Operating Platform
The generalized OP for network softwarization is intended as an “over-arching and agnostic framework”
which will perform infrastructure-agnostic orchestration, referring this to the possibility to support the
continuous onboarding of new capabilities (e.g., new types of network infrastructures) and resources (e.g.,
links with more bandwidth), (i) without affecting any already active service and (ii) by allowing new services
to take advantages from the new features. This enable the orchestration architecture to be future-proof,
being able to support the continuous evolution of infrastructure-level components when they offer new
capabilities, add support for new technological domains, or replace an existing infrastructure controller with
another software (e.g., an existing ONOS SDN controller is replaced with OpenDaylight).
This prototype demo has shown a simplified version of a generalised OP that is based on a continuous
advertisement of capabilities and resources from underlying infrastructure-layer domains, which allows the
orchestration to adapt its service logic to exploit the most up-to-date capabilities. The feasibility will be
shown to setup a complex NFV service across multiple domains, such as two OpenStack instances connected
by an SDN network, where all the service functions (e.g., NAT, firewall, etc.) are launched in the datacenter
and the intermediate SDN network is used only to connect all the different components together. However,
when the SDN network advertises also the capability to host a given set of network applications (e.g., a NAT),
the orchestrator will adapt its service logic and it will instantiate part of the service in the datacenter (e.g., as
virtual machines), part in the SDN domain (e.g., as ONOS applications), hence enabling more aggressive
optimization strategies in the overarching orchestrator.

References

[6.3.1-1] D. Soldani, A. Manzalini, et al. "Software defined 5G networks for anything as a service [Guest
Editorial]." Communications Magazine, IEEE 53.9 (2015): 72-73.

[6.3.1-2] A. Manzalini, N. Crespi, “An Edge Operating System enabling Anything-as-a-Service”, to appear
in IEEE Communication Magazine’s feature Topic: Semantics for Anything-as-a-Service, March
2016.

[6.3.1-3] D. Soldani, A. Manzalini. "A 5G Infrastructure for Anything-as-a-Service." Journal of
Telecommunications System & Management 3.2 (2014).

[6.3.1-4] “FG IMT-2020: Report on Standards Gap Analysis”, ITU, TD 208 (PLEN/13), SG-13.
[6.3.1-5] OASIS TOSCA, “Simple Profile for Network Functions Virtualization (NFV) Version 1.0”,
available at http://docs.oasis-open.org/tosca/tosca-nfv/v1.0/tosca-nfv-v1.0.html.
[6.3.1-6] ETSI GS NFV 003 V1.2.1 (2014-12), “Network Functions Virtualisation (NFV) Terminology for Main
Concepts in NFV” available at
https://www.etsi.org/deliver/etsi_gs/NFV/001_099/003/01.02.01_60/gs_NFV003v010201p.pdf.
[6.3.1-7] IETF RFC 7498, “Problem Statement for Service Function Chaining”, available at
https://tools.ietf.org/html/rfc7498.
[6.3.1-8] C. Chappell “Deploying Virtual Network Functions: the complementary roles of TOSCA and
NETCONF/YANG”, Heavy Reading White Paper (in behalf of CISCO and Alcatel Lucent)
http://www.heavyreading.com/

[6.3.1-9] H2020 SONATA project website: http://sonata-nfv.eu/.
[6.3.1-10] H2020 5G Exchange (5GEx) project website: https://www.5gex.eu/.

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