Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14468
Title: Weighted dynamic bandwidth allocation for priority support in EPON
Authors: XIE JING
Keywords: EPON, dynamic bandwidth allocation, optical line terminal, optical network unit, QoS, Differentiated services
Issue Date: 15-Mar-2005
Source: XIE JING (2005-03-15). Weighted dynamic bandwidth allocation for priority support in EPON. ScholarBank@NUS Repository.
Abstract: EPON as one possible solution for next generation access network is expected to deliver multimedia applications. To support multiple services, it should be capable of supporting QoS of differentiated services. Since resources used to support service differentiation primarily include buffers and bandwidth, buffer management and bandwidth allocation schemes are needed in EPON. An EPON is a point-to-multipoint network which consists of one OLT and multiple ONUs. In the upstream direction from ONUs to the OLT, the channel is shared by all ONUs. To avoid data collisions, the OLT has to arrange the transmission order for different ONUs. An available solution is to assign a time slot to each ONU, which then only transmits within its assigned time slot. Considering the bursty characteristic of network traffic, dynamically allocating the bandwidth is more adaptive and flexible. In this thesis, a weighed dynamic bandwidth allocation scheme for EPON is proposed to effectively allocate the bandwidth and support QoS of differentiated services. With this scheme, the bandwidth is allocated inter-class and intra-class. Once traffic load exceeds the channel capacity, some requirements are constrained by a bandwidth threshold. The bandwidth threshold is determined by a weight and also guarantees a minimum bandwidth for each traffic class. To rationally determine the weight for each class, two estimation fomulas are deduced. Simulation is conducted to evaluate the proposed dynamic bandwidth allocation scheme and validate the algorithm of determining the weight.
URI: http://scholarbank.nus.edu.sg/handle/10635/14468
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