Low Latency DWBA Scheme in Fixed and Mobile Converged TWDM-PON

• 1、School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876

Abstract：With the rapid development of the 5th generation mobile communication technology, Passive Optical Network (PON) has become an important scene for fixed and mobile service access. The efficient synergy of status-request dynamic bandwidth allocation (SR-DBA) and cooperative dynamic bandwidth allocation (CO-DBA) for mobile fronthaul can achieve the convergence of fixed and mobile services, which is the focus of PON research currently. However, a conflict between CO-DBA and SR-DBA is to arise when using mini-mini-slot based on 5G NR, which increases the upstream transmission latency of the fronthaul service in the PON. In this paper, we proposed a DWBA scheme based on wavelength and bandwidth preemption in a fixed and mobile converge TWDM-PON. This secheme allows high-priority fronthaul services to preempt the wavelength and bandwidth resources of low-priority fixed services when bandwidth allocation conflicts, and then allocate the front transmission window. Simulation results show that, compared with the traditional CO-DBA and SR-DBA cooperation mode (non-preemptive mode), this scheme can effectively reduce the upstream transmission latency of the fronthaul service.

Keywords： TWDM-PON low latency fronthaul mini-slot 5G wavelenth and banwidth preemption