Low Latency DWBA Scheme for Mini-Slot Based 5G new Radio in a Fixed and Mobile Converged TWDM-PON

Cooperative dynamic bandwidth allocation (CO-DBA) enables time division multiplexed passive optical network (TDM-PON) to become a possible solution for mobile fronthaul. Meanwhile, status-report DBA (SR-DBA) still retains its advantage on bandwidth efficiency for conventional PON services. The collaboration of CO- and SR-DBA is an enabling approach for fixed-mobile convergence into a single PON infrastructure. However, a resource allocation conflict between CO- and SR-DBA is to arise when using an emerging 5G new radio interface based on the mini-slot. This conflict will cause a large delay that can not meet the time-sensitive fronthaul requirement. In this study, we consider a time and wavelength multiplexed PON (TWDM-PON) for fixed and mobile services accommodation because of its capacity and flexibility. A novel DWBA scheme is proposed by means of wavelength and bandwidth preemption (WBP) mechanism. The basic rule of WBP is that a time-sensitive traffic can preempt the wavelength and bandwidth allocated to the time-tolerent traffic when a conflict happens. We demonstrate that the proposed DWBA can significantly reduce the latency caused by the conflict, when compared to the existing integrated CO- and SR-DWBA approach with 5G NR mini-slot.