  The future 5G transport networks are envisioned to support a variety of
vertical services through network slicing and efficient orchestration over
multiple administrative domains. In this paper, we propose an orchestrator
architecture to support vertical services to meet their diverse resource and
service requirements. We then present a system model for resource orchestration
of transport networks as well as low-complexity algorithms that aim at
minimizing service deployment cost and/or service latency. Importantly, the
proposed model can work with any level of abstractions exposed by the
underlying network or the federated domains depending on their representation
of resources.
