Research Of Upstream Bandwidth Allocation Management Based On Multi-service In Software-defined WDM-TDM PON

With the continuous development large data,cloud computing and HIDV, users require high-speed and large-capacity access bandwidth to meet higher quality and different types of network services. The access network,as the bridge between the backbone network and the metropolitan area network, is becoming the fuse that restrains uesrs to develop the traffic.It is imperative to research the new generation access network technology with large-capacity and flexible. The WDM-TDM PON combined with the technical maturity of TDM PON and advaced technology of WDM PON,with the high efficiency,high scaability,flexibility and easy to upgrade.And the WDM-TDM PON has become the most effictive tehnology to resolve high-capacity traffic requests and high-quality service request.However, the network can not carry out expansion effectively and adopt different DBA methods for different services, that casue the resource allocation complexity. For the uplink dynamic bandwidth allocation optimization strategy in the hybrid WDM-TDM PON, the main achievements and innovation in this paper are as follows.(1) A new WDM-TDM PON architecture based on software defined network is proposed, which provides an implementation frame for the next allocate algorithm. The new hybrid PON has a throught of software-defined and programmable, which introduces the controller to control the hardware in the optical access network. In order to avoid the interference and expand the network easily, the PON adopts the colorless ONU which has a low-cost and uses WDM technology to expansion.(2) We present a flexible and programmable upstream dynamic bandwidth allocation algorithm based on the network status(ST-DBA). The ST-DBA avoids the hard-code allocation method and introduces a controller to adaptively perform allocation strategy with customized optimization in different network load scenarios. The simulation results show that the ST-DBA not only improve the bandwidth utilization and throughput effectively but also reduce the average delay.(3) We propose a hybrid scheduling algorithm with wavelength and time slot, which uses the controller to schedule wavelength periodically and allocates the resources to ONUs effectively. The simulation results show that the throughput of network resources and the delay of traffic transmission can be improved with the change of network load.