  Network slicing is considered to be one of the key enablers to Fifth
Generation (5G) communication system. Legacy telecommunication networks have
been providing various services to all kinds of customers through a single
network infrastructure. In contrast, with the deployment of network slicing,
operators are now able to partition entire network into different slices, each
with its own configuration and Quality of Service (QoS) requirements. There are
many applications across industry, each needs an independent slice with its own
functions and features. All these applications open new business opportunities,
which require new business models and therefore every single slice needs an
individual Service Level Agreement (SLA). In this paper, we proposed a
comprehensive end-to-end structure of SLA between tenant and service provider
of slice-based 5G network, which balances the interests of both sides. The
proposed SLA is expected to define reliability, availability, and performance
of delivered telecommunication services in order to ensure that right
information gets to the right destination at right time, safely and securely.
We also discussed the metrics of slice-based network SLA such as throughput,
penalty, cost, revenue, profit, and QoS related metrics, which we think are
very critical to be considered during the agreement.
