Enhanced Hierarchical Dynamic Bandwidth Allocation Algorithm with Excess Bandwidth and SLA Techniques for Upstream Ethernet PON (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.
Performance Evaluation Of Bandwidth Scheduling Techniques In Passive Optical Networks
International Journal Of Engineering And Computer Science, 2016
Passive Optical Networks are thought to be ONU User 1 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 ONU User 2 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 OLT 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 ONU User M algorithms presented.
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 ...
QoS-promoted dynamic bandwidth allocation for Ethernet passive optical networks
2008 Third International Conference on Communications and Networking in China, 2008
In this paper, we propose a QoS-promoted dynamic bandwidth allocation (Q-DBA) method to support quality-ofservice (QoS) requirement services for Ethernet passive optical networks (EPON). The Q-DBA method classifies the three types of services: voice, video, and data into six priorities. It can not only satisfy QoS requirements of real-time service and but also improve the QoS of non-real-time packets. Simulation results show that the Q-DBA can fulfill the video dropping probability requirement while the conventional dynamic bandwidth allocation with multiple services (DBAM) fails. Also, the Q-DBA can achieve the fairness index of average data delay close to 1 but DBAM's fairness index of average data delay varies greatly. Index Terms-quality-of-service (QoS), dynamic bandwidth allocation, Ethernet passive optical networks (EPONs), optical line terminal (OLT), and optical network unit (ONU).
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.
Journal of Lightwave Technology, 2009
The Ethernet passive optical network (EPON) is a reliable cost effective, high bit-rate point-to-multipoint optical access network. With new applications and services that emerged in last decade, the quality of service support in EPON has become a major concern. In our work, we analyze the performance of dynamic bandwidth allocation algorithms and intra-ONU scheduling algorithms, and further investigate how a combination these algorithms can be implemented in EPON in order to efficiently support the transmission of multimedia traffic and improve the performance of the low priority traffic at the same time. The system model separates the transmission of high priority traffic from the transmission of lower priority traffic and introduces the implementation of intra-ONU scheduling algorithms for lower traffic class transmission. Numerical results show a slight degradation of transmission characteristics for high priority traffic but on the other side, significant improvement of the lower priority traffic transmission parameters has been detected. Index Terms-Dynamic bandwidth allocation (DBA), Ethernet passive optical network (EPON), intra-ONU scheduling, quality of service (QoS). I. INTRODUCTION F OR the last ten years, Internet access speeds have been rising. Today, bandwidth-intensive content and peer-topeer applications consume the whole bandwidth in most broadband networks. Digital subscriber line (DSL) and cable modem (CM) connections cannot support new bandwidth-hungry applications so access network remains the bottleneck. EPON has been considered as solution for the first or last mile problem [1]. An EPON is point-to-multipoint fiber optical network which employs only passive optical network components in the signal's path and typically consists of one optical line terminal (OLT) and multiple optical network units (ONUs). ATM (Asynchronous Transfer Mode) has been considered as transmission protocol in EPON, but inefficient ATM cell tax, lack of multicast support per service, and complicated adaptation layer Manuscript
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.
Hierarchical scheduling to support differentiated services in Ethernet passive optical networks
Computer Networks, 2006
The Ethernet passive optical network (EPON) has recently attracted more and more research attentions since it can be a perfect candidate for next generation access networks. Supporting differentiated services (DiffServ) is an important issue for service providers to design an EPON system. In this paper, we deploy the hierarchical scheduling for the medium access control (MAC) layer in EPONs, which consists of the inter-ONU scheduling and intra-ONU scheduling, to provide DiffServ as well as share the upstream bandwidth efficiently among multiple users. The inter-ONU scheduling among the ONUs uses the efficient MAC scheme that we have proposed before. It provides services to different ONUs based on the service level agreement (SLA). The intra-ONU scheduling within the ONU adopts the two-stage queuing (TSQ) mechanism to provide DiffServ to different traffics in the same ONU. It can provide better services to the lowerpriority traffics to achieve better fairness than the strict priority queuing (SPQ) mechanism. The combined scheme greatly mitigates the light-load penalty that is obvious in other schemes. The simulation results show that our scheme for the hierarchical scheduling can effectively provide differentiated services for different types of traffics, and also achieve the fairness to some extent.
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.
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.