Role of ONAP Optimization Framework (ONAP-OF) and Multi Cloud (ONAP-MC) in all 5G use cases
ONAP-OF plans to provide optimization capability as a service for ONAP R2 and beyond. ONAP-MC currently provides infrastructure statistics and infrastructure fault notification/remediation as services. For ONAP R1, this service encompasses detailed infrastructure utilization statistics across various subsystems compute, network, storage and energy. For ONAP R2 and beyond, this service plans to provide aggregate infrastructure utilization statistics at a multi-cloud instance level, clusters within a multi-cloud instance level etc.
The relationship between MC instance and Distributed DCs is many to many; a single MC instance could map to a single distributed DC, groups of distributed DCs could be represented by a single MC instance or a single distributed DC could map to multiple MC instances.
In the context of 5G, ONAP-OF and ONAP-MC working together with other ONAP components can address several challenges such as
- Optimized SON dynamic spectrum allocation
- White space and un-licensed spectrum use
- Optimized VNF placement across distributed DCs for network slicing
- Slice optimization
- Macro and micro cell interplays
- Energy optimization
- Zero touch new carrier integration
ONAP-OF uses a typical optimization construct:
- Objective: Maximize/minimize a metric, measured by appropriate key performance indicators (KPIs)
- Technology and operating constraints, such as:
- Parameter change limits (such as power)
- Frequency of changes permitted
- Number of parameters that can be changed simultaneously
- Data latencies (typically in percentile)
- DC compute, network, storage, energy capacity
- Location based and time based energy cost
The objective metrics could be throughput (maximize), interference levels (minimize), accessibility/retainability (maximize), cost (minimize) etc. KPIs could be infrastructure utilization statistics provided by ONAP-MC.
Following is a sequence diagram of how OOF plays in the optimal placement of various VNFs within the purview of 5G.