Two-stage optimization of uplink forwarding order with cooperative DBA to accommodate a TDM-PON-based fronthaul link

Abstract

A fronthaul (FH) link based on a time-division multiplexing passive optical network (TDM-PON) has received attention because it is highly cost effective. The uplink transmission has a long forwarding delay in the TDM-PON link, but this issue can be overcome using a cooperative dynamic bandwidth allocation (CO-DBA) scheme. An optical line terminal receives wireless scheduling information from the distributed unit, which is a part of the mobile base station, and can estimate the amount and arrival timing of the FH signal to an optical network unit (ONU) in advance. However, reports of conventional CO-DBA have not considered a situation involving the accommodation of a large number of ONUs, for which forwarding order control considering the FH characteristics is important. By focusing on maintaining the mobile coverage area as a design criterion, this study proposes a two-step maximization scheme of the number of transmittable ONUs within the FH requirement. Numerical simulation indicates improvements in the number of transmittable ONUs and bandwidth usage efficiency.