Deliverable D2.3 - System specification, system design and system modelling

This document summarizes the activities of Task T2.3 in the 6G-EWOC project, focusing on an advanced control and management system to support the deployment of network services (NS) formed by both computing and networking resources. To dynamically and automatically handle the lifecycle management (i.e., creation, updating and termination) of NSs, a centralized hierarchical orchestration and control instance referred to as Network Service Orchestrator (NSO) is adopted. The NSO integrates a pool of control operational functions, workflows, algorithms and interfaces that enable: i) the programmability of the underlying network devices (e.g., transceivers, photonic switches, etc.) and computing servers; ii) the resource selection and allocation to fulfil the service requirements (e.g., guaranteed bandwidth, required CPUs, RAM and storage); iii) and algorithms targeting simultaneously multiple objectives such as efficient use of the network/computing resources whilst reducing the overall power consumption. For the latter, the use of AI/ML algorithms assisting the orchestration decisions when tackling energy/power consumption optimization is explored.