Thread guaranteed algorithm for real time traffic in multi-threaded polling of PON-based open access network

Open access network (OAN) is an efficient converged network that can effectively connects several service providers in a ubiquitous city (u-City). Passive optical network (PON) provides enough bandwidth to support huge data traffic of the modern OAN of u-City. However, some service providers in the u-City contain high priority (HP) traffic while other service providers comprise low priority traffic, i.e., best efforts (BE) traffic. This HP traffic means the real time traffic, e.g., voice over internet protocol (VoIP), IPTV, video on demand (VoD), video conferencing etc. The conventional polling algorithms of the PON cannot provide differentiated service for data traffic of different priority groups. These polling algorithms also require almost same back off delay for both the HP and BE data traffic. So the PON-based OAN with the conventional polling algorithms are not enough to provide the real time service for the HP traffic. In this paper, we propose a new multi-threaded dynamic bandwidth allocation (DBA) algorithm for the PON-based OAN that provides lower delay for the HP traffic by reducing the back off delay in every polling cycle. The proposed algorithm is called thread guaranteed bandwidth allocation (TGBA) algorithm. Performance of the proposed TGBA algorithm is evaluated by numerical simulations in terms of end-to-end packet delay and pre-transmission delay. The proposed scheme provides lower end-to-end and pre-transmission delays for the HP traffic than those of the conventional single-threaded and multi-threaded DBA schemes.