An enhanced DWBA algorithm in WDM-TDM PON networks

The main purpose of WDM-TDM PON access network is to use wavelength division multiplexing approach to increase wavelength channels in order to enhance TDM PON network bandwidth. Enhancement of bandwidth will generate more bandwidths that can be allocated to users and will result in greater quality of service. In this paper, we considered dynamic allocation method. For the conventional static allocation method, not used bandwidth which are allocated by static allocation approach is unable to be allocated to other ONUs in the service, therefore it decreases usage of upstream bandwidth. If non used bandwidths were allocated to other ONUs, users' quality of service has been improved and consequently, ONU's buffered traffic would be decreased. Thus improvement of efficiency in allocation of bandwidth, more flexible allocation approach is needed. In this study we propose the model for wavelength and bandwidth allocation in the WDM EPON network, namely Widest Bandwidth First on Earliest Available Supported Channel (WBF-EASC) model. In addition to the model analysis, the simulation result is presented and the effectiveness of the proposed model is explained.