Performance Evaluation Of Bandwidth Scheduling Techniques In Passive Optical Networks (original) (raw)
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2004
Passive Optical Networks are thought to be the next step in the development of Access Networks and providing broadband access in the "last mile" area. Ethernet PONs (EPON) gain the most attention from the industry as they offer highly flexible, cost effective solution. In this paper we propose algorithms that provide Dynamic Bandwidth Allocation and shift the burden of queue management from the customer to the network, this results in less complicated and more generic equipment used on the customer's premises. We show the results of simulations to validate the effectiveness of algorithms presented.
Intra-ONU Bandwidth Scheduling in Ethernet Passive Optical Networks
IEEE Communications Letters, 2004
Quality-of-service (QoS) support in Ethernet passive optical networks (EPON) is a crucial concern. However, most studies have only focused on optical line terminal (OLT) capacity allocation amongst multiple optical network units (ONU), and the further issue of intra-ONU allocation remains open. In this work a novel decentralized intra-ONU solution is presented using virtual-time schedulers. Results confirm good performance for a wide range of input traffic classes and loads. Index Terms-Ethernet PON (EPON), optical access, quality of service (QoS), scheduling.
2009 Second International Conference on Computer and Electrical Engineering, 2009
Passive Optical Networks (PONs) are thought to be the next step in the development of Access Networks and providing broadband access in the "last mile" area. Ethernet PON (EPON) gains the most attention from the researchers as it offers highly flexible and cost effective solution. In this paper we propose two high level scheduler algorithms inside the Optical Line Terminal (OLT) and Optical Network Units (ONU). In the proposed Dynamic Bandwidth Allocation (DBA) algorithm, the OLT allocates the bandwidth to the ONUs in proportion to the weight associated with the excess bandwidth available, while the ONU preferentially allocates its bandwidth to queues with a strict or non strict priority order. The algorithms provide dynamic bandwidth allocation and separate the burden of queue management fairly between the customer and the network. This led to less complicated and more intelligent equipment has been used on the customer's premises. We show the results of simulations to validate the effectiveness of algorithms presented and to provide quality of service (QoS) for triple play real time services in Ethernet passive optical networks (EPONs).
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004
Ethernet Passive Optical Networks (EPONs) are an emerging access network technology that provides a low cost solution for fiber-to-the-home (FTTH) and fiber-to-the-business (FTTB). In this paper, conventional bandwidth allocation schemes in EPON are shown to suffer from poor utilization under nonuniform traffic conditions, particularly as the number of ONUs, guard time and round-trip time increase. To resolve this problem, we propose a new scheme that allocates a timeslot intelligently by considering other ONUs' queue occupancy, instead of strictly enforcing a maximum timeslot size. The analysis and simulation results show that the proposed scheme can provide significantly higher utilization than conventional schemes and can support max-min fairness under non-uniform traffic conditions.
Dynamic bandwidth distribution for supporting QoS over Ethernet based passive optical networks
Ethernet passive optical networks (EPON) are an emerging access network technology for deploying optical access lines between a carrier's central office and a costumer site. Recent years have witnessed a significant growth in the backbone bandwidth but with a little change in the access network. "Last mile" still remains a bottleneck between a high capacity LAN or home network and the backbone. In this paper, we first provide a brief introduction to EPON networks and the dynamic bandwidth distribution protocols. The QoS issues and system performance parameters of EPON network have been studied. These include the study of impact of buffer size of ONU on packet loss ratio for different types of traffic classes. Packet loss ratio as a function of ONU's offered load has also been studied. This, combined with a study of mean packet delay with number of ONUs in an EPON can prove to be of immense use in optimizing number of ONUs that can be supported by a PON system . By ...
Dynamic Bandwidth Allocation with Multi-ONU Customer Support for Ethernet Passive Optical Networks
2018 IEEE Symposium on Computers and Communications (ISCC), 2018
This paper introduces a mechanism for the support of multi-ONU service level agreements (SLAs) in dynamic bandwidth allocation (DBA) algorithms for Ethernet passive optical networks (EPON). The employment of SLAs for multiple optical network units (ONUs) instead of individual ONUs allows better utilization of the bandwidth reserved for these ONUs. The proposed DBA mechanism allows customers owning multiple ONUs to redistribute the aggregated bandwidth of the group of ONUs to better balance the bandwidth utilization. The proposed DBA can be employed in different use cases such as mobile backhauling/fronthauling, PON virtualization, and multi-site enterprise networking. Simulation results show that the proposed DBA improves the network performance.
2010
Ethernet Passive Optical Network (EPON) has been considered for access networks for quite some time to provide high-speed and high-capacity services. As a novel type of network, EPON presents many challenges so one main aim of this paper is to provide a test-bed based on IEEE 802.3ah standards using OPNET Modeler to enable smooth implementation of the wide range of bandwidth allocation algorithms. This paper includes a full implementation of a sample EPON environment considering the standard messages, protocols and structures as well as the modeling, simulation and performance analysis of the selected bandwidth allocation algorithms. To the best of our knowledge, this work presents a detailed network architecture for the EPON environment and its most challenging issues for the first time. Simulation results demonstrate that the proposed test-bed provides smooth insertion of the different bandwidth allocation algorithms for EPON and can be considered as the standard model for further research and investigations.
Bandwidth allocation for service level agreement aware Ethernet passive optical networks
2004
Passive Optical Networks (PON) are thought to be the next step in the development of access networks and providing broadband access in the "last mile" area. Ethernet PONs (EPONs) are gaining the most attention from industry as they offer a highly flexible, cost effective solution. In this paper, we present a new approach to the problem of optimal bandwidth allocation in EPONs. We show that by moving all the access control functionality to the Optical Line Terminator, a flexible solution could be achieved which offers full support for Service Level Agreements and removes the burden of managing the configuration of every Optical Network Unit. We include results of simulations that show that such an approach can deliver good performance in terms of average and maximum packet delay. We show that, a novel Grant Multiplexing scheme can significantly reduce jitter and end-to-end delay experienced by the high priority classes of traffic. To prove these points we present results of detailed experiments that were run on a C++ event driven simulator, that we haveloped.
Recent Dynamic Bandwidth Allocation Algorithm Methods in Ethernet Passive Optical Network
International Journal of New Computer Architectures and their Applications, 2014
The "last mile" bandwidth bottleneck problem can be best solved by using Ethernet Passive Optical Network (EPON). EPON is a promising technology to implement the Fiber To The Home solution. Dynamic bandwidth allocation (DBA) is one of the critical issues in the design of the EPON system that has been studied by many researches. This paper introduces the fundamental concepts on EPONs, its protocol and its bandwidth allocation. We also compile and classify the research works in order to provide the state-of-art of the DBA algorithms. The advantages and disadvantages of each classification is provided. The classifications provide insightful presentations of the prior work on EPONs which will help the researches to choose the most suitable algorithm as according to the needs.
Dynamic bandwidth allocation for quality-of-service over Ethernet PONs
Selected Areas in …, 2003
Ethernet-based passive optical network (EPON) technology is being considered as a promising solution for next-generation broadband access network due to the convergence of low-cost Ethernet equipment and low-cost fiber infrastructure. A major feature for this new architecture is the use of a shared transmission media between all users; hence, medium access control arbitration mechanisms are essential for the successful implementation of EPON: i.e., ensure a contention-free transmission and provide end users with an equal access to the shared media. In this paper, we propose to use the multipoint control protocol defined within the IEEE 802.3ah Task Force to arbitrate the transmission of different users, and we present different dynamic bandwidth allocation (DBA) algorithms to effectively and fairly allocate bandwidths between end users. These DBA algorithms are also augmented to support differentiated services: a crucial requirement for a converged broadband access network with heterogeneous traffic. We show that queueing delays under strict bandwidth allocation algorithms results in an unexpected behavior for certain traffic classes, and we suggest the use of DBA with appropriate local queue management to alleviate this inappropriate behavior. We conduct detailed simulation experiments to study the performance and validate the effectiveness of the proposed protocols.