Traffic localization-based dynamic bandwidth allocation algorithm for improvement of QoS in peer-to-peer architecture of passive optical networks

Passive optical network (PON) is a popular technology, in recent days, which can be merged with peer-to-peer (P2P) network architecture. In P2P architecture, there is no need for a dedicated server and each peer can provide the data and receive the required data from other peers. With increasing traffic, there occurs a problem in resource sharing and therefore, the users experience higher latency and lower overall quality of services (QoSs). There are several recent studies regarding the use of PON in P2P network architecture, and some of them are studied for localization of traffic. But in the case of localizing traffic, the use of multiple upstream wavelengths was not studied previously. In this paper, we have proposed a new PON architecture and a new dynamic bandwidth allocation (DBA) algorithm called localizing traffic-based DBA (LT-DBA) to improve the overall QoSs of the PON-based P2P network. By localizing the intra-PON traffic, this architecture separates the inter-PON and intra-PON traffic. Here, in addition to the conventional passive optical splitter, a wavelength reflector is used which can reflect the upstream wavelength used for intra-PON traffic. We also propose an efficient management scheme of the intra-PON traffic, where no report is needed to send to the optical line terminal (OLT). The OLT needs not to allocate time-slot for local packets, and there is a huge optimization of resources. The LT-DBA scheme was evaluated by formulating mathematical models and numerical simulations. The simulations were performed by varying the percentage of local data and by changing the number of optical network units in PON. The simulation results show that our proposed architecture and LT-DBA scheme outperform the existing REDIRECT DBA scheme in terms of end-to-end delay, jitter, and throughput.