Real-time capable, low-latency upstream scheduling in multi-tenant, SLA compliant TWDM PON

Virtualized passive optical networks (vPONs) offer a promising solution for modern access networks, bringing enhanced flexibility, reduced capital expenditures, and support for multi-tenancy. By decoupling network functions from the physical infrastructure, vPONs enable service providers to efficiently share network resources among multiple tenants. In this paper we propose a novel, to our knowledge, merging DBA algorithm called the dynamic time and wavelength allocation algorithm for a virtualized DBA architecture in multi-tenant PON environments. The algorithm, which enables the merging of multiple virtual DBAs into a physical bandwidth map, introduces multi-channel support, allowing each optical network unit (ONU) to dynamically change, taking into consideration different switching times and transmission wavelengths. Leveraging the Numba APIs for high-performance optimization, the algorithm achieves real-time performance with minimal additional latency, meeting the stringent requirements of SLA-compliant, latency-critical 6G applications and services. Our analysis highlights an important trade-off in terms of throughput under multi-tenant conditions, between single-channel versus multi-channel PONs, as a function of ONU tuning time. We also compare the performance of our algorithm for different traffic distributions. Finally, in order to assess the time computing penalty of dynamic wavelength optimization in the merging DBA algorithm, we compare it against a baseline static wavelength allocation algorithm, where ONUs are designated a fixed wavelength for transmission.