Mohd. Shahmi Abdul Majid

Dynamic hierarchical bandwidth allocation using Russian Doll Model in EPON

This paper demonstrates a new hierarchical Dynamic Bandwidth Allocation algorithm using the Russian Doll Model (RDM) to allocate bandwidth for intra-Optical Network Unit (ONU) in an Ethernet Passive Optical Network (EPON). The allocation of bandwidth is based on the classification and prioritization of service. The algorithm addresses the requests of ONUs and provides differentiated services by balancing priority and fairness. The simulation results show that the proposed algorithm performs well in supporting the triple-play services, i.e. video, voice, and data, as well as making effective adjustment in balancing bandwidth sharing between the ONUs compared with two other existing Dynamic Bandwidth Allocation (DBA) algorithm. The proposed algorithms shows significant performance improvements in terms of bandwidth utilization, packet delay and the fairness.

Managing Differentiated Services in Upstream EPON

In order to enhance the bandwidth utilization while maintaining the required quality of service (QoS), an efficient dynamic bandwidth allocation (DBA) algorithm that supports global priority has been proposed in upstream Ethernet passive optical network (EPON). The algorithm aims to allocate bandwidth to different traffic classes according to the priority as a whole. The simulation is done using MATLAB by comparing the proposed algorithm with a DBA algorithm found in the literature. The proposed algorithm shows an improvement as high as 11.78% in terms of bandwidth utilization and reduces expedited forwarding (EF), assured forwarding (AF) and best effort (BE) delay as high as 25.22%, 18.96% and 21.34% respectively compared to Min’s DBA.

Improving the performance of hierarchical bandwidth allocation for upstream EPON

Many issues of intra- optical network unit (ONU) bandwidth allocation in Ethernet Passive Optical Network (EPON) remain open. In this paper, we report the performance of hierarchical bandwidth allocation algorithm incorporated Russian Doll Model (RDM) as a solution to allocate bandwidth for intra- ONU in upstream EPON. The allocation of bandwidth is based on the class of service and its priority. Results confirm significant performance improvements for a wide range of traffic loads and triple-play (video, voice, and data) services in terms of the bandwidth utilization, wasted bandwidth and fairness compared with the SHDBA algorithm. The RDDBA maximum significant performance improvements compared to SHDBA is up to 30% depending on the variant and the characteristics of the network traffic. The hierarchical bandwidth allocation with RDM improves the performance of EPON by satisfying the requests of all ONUs and provide differentiated services by guaranteeing both the priority and fairness.

Efficient dynamic bandwidth allocation for upstream EPON with global priority

An efficient dynamic bandwidth allocation (DBA) algorithm with global priority is proposed for upstream Ethernet passive optical network (EPON) in this paper. The algorithm is hierarchical and it ensures that the excessive bandwidth is allocated fairly according to the priority. The simulation is done using MATLAB by comparing Efficient DBA with global priority to Efficient DBA with local priority. The results show an improvement as high as 11% in terms of the bandwidth utilization and 46% in terms of the delay.

Implementing Universal Priority DBA Algorithm in PIC based EPON Testbed

Abstract Ethernet passive optical network (EPON) is becoming one of the best schemes in the broadband access network as it combines the Ethernet and passive optical network technology. In order to avoid collision in upstream EPON, Universal Dynamic Bandwidth Allocation (UDBA) algorithm is proposed in this paper where it can support a universal priority in the entire EPON system. For proof-of-concept, the UDBA algorithm is implemented inside a proposed peripheral interface controller (PIC) based EPON testbed in order to evaluate the communication protocol involved. To the best of our knowledge, this is the first time PIC is being used in EPON testbed for this purpose. To ensure that the testbed is valid, we compare the result that we achieved via testbed with the results achieved via MATLAB simulation in terms of throughput, delay and fairness. The simulated results show a good agreement with the experimental with some minor expected differences.

Global priority DBA using fuzzy logic in Ethernet PON

In order to fully optimize the bandwidth in upstream Ethernet passive optical network, dynamic bandwidth allocation (DBA) algorithm is used to allocate the bandwidth efficiently. In this paper, DBA algorithm that can support global priority is used to ensure the quality of service. Fuzzy logic is incorporated for the first time in the global priority DBA to reduce the packet loss as low as 13% and reduce the Expedited Forwarding, Assured Forwarding and Best Effort delay up to 31%, 19% and 13%, respectively if compared to Mins DBA and EDBA algorithms.

A PIC implementation of upstream transmission for EPON

Ethernet passive optical network (EPON) is becoming more popular since the users demand more bandwidth each day. A lot of simulation studies have been done in order to study the upstream EPON transmission, but they are less accurate due to assumed parameters and it does not take into account the physical parameters and the non-linear effects of the optical components. Therefore, this paper presents the study of upstream EPON transmission using hardware. To the best of our knowledge, this is the first time peripheral interface controller (PIC) is being used for an EPON testbed. We also compare the delay result that we achieved from the testbed to the result that we obtained via simulation. The trend of the graph is of the same pattern, with some value differences that are expected due to too many assumptions used in simulation.

A multidrop optical network testbed for EPON platform

In an Ethernet Passive Optical Network (EPON) environment, the Optical Line Terminal (OLT) and Optical Network Unit (ONU) are the main end components that are required for the transfer of data. For the data transmission process, a communication protocol, i.e Multi-Point Control Protocol (MPCP) is required to avoid collision of the data that travel between the OLT and ONU. This paper describes an effort in developing an EPON environment with MPCP for the OLT and ONU communications. A multidrop optical network testbed was developed on a platform intergrated with PIC microcontrollers. Although the microcontrollers have some limitations, the testbed can be used to test out protocols and algorithms for the EPON environment.