The Experts below are selected from a list of 52050 Experts worldwide ranked by ideXlab platform
Biswanath Mukherjee - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Bandwidth and wavelength allocation scheme for next-generation wavelength-agile EPON
IEEE OSA Journal of Optical Communications and Networking, 2017Co-Authors: Lin Wang, Massimo Tornatore, Xinbo Wang, Hwan Seok Chung, Soomyung Park, Biswanath MukherjeeAbstract:Recently, the IEEE 802.3 Ethernet Working Group has classified three architectures for the nextgeneration Ethernet passive optical network (NG-EPON). They are called single-scheduling domain (SSD) PON, multi-scheduling domain (MSD) PON, and wavelength-agile (WA) PON, and they differ based on how a group of optical network units (ONUs) share awavelength. Existing Dynamic Bandwidth and wavelength allocation (DBWA) schemes for conventional EPON can be applied to MSD-PON and SSDPON, but not WA-PON. This is because WA-PON is a new architecture with full flexibility where a flexible number of wavelengths can be assigned to one ONU, and multiple ONUs can transmit at the same time. In this work, we develop a mathematical model and a novel DBWA scheme for transmission scheduling in WA-PON. However, as WA-PON incurs penalties in terms of delay and power consumption when an ONU activates its transmissions on new wavelengths, a trade-off between energy saving and data-transfer latency reduction needs to be carefully addressed when performing transmission scheduling. So, we develop a power-consumption model and modify the proposed DBWA scheme to enhance the energy efficiency ofWA-PON. Finally, we conduct simulation experiments for performance evaluation of the three PON architectures in terms of latency and packet loss ratio.We quantitatively investigate the influence of various parameters, such as the number of ONU transceivers and ONU buffer size, onWA-PON latency and packet loss ratio, and we evaluate the energy efficiency gain of the modified DBWA scheme.
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Dynamic Bandwidth allocation for long-reach PON: Overcoming performance degradation
IEEE Communications Magazine, 2010Co-Authors: Bjorn Skubic, Jawwad Ahmed, Biao Chen, Lena Wosinska, Jiajia Chen, Biswanath MukherjeeAbstract:A passive optical network, with its inherent point to multi-point structure, allows for centralized placement of active equipment and possible extension of its boundary towards core networks. This property of the PON can be exploited for node consolidation where multiple central offices are replaced by a single one covering a larger service area. Such node consolidation is being particularly driven by the need for network operational cost saving, and is offering significant challenges to PONs. The degree of node consolidation that can be achieved is limited by the reach of conventional PON systems. In order to achieve a larger degree of node consolidation, an extension of the PON reach, beyond the conventional 20 km, is required. This article addresses the challenges of the Dynamic Bandwidth allocation, where increased reach results in a degradation of DBA performance and quality of service support. This degradation is a consequence of the increased propagation delay of the DBA messages exchanged between different PON elements. A potential solution to the performance degradation is the introduction of a multi-threaded DBA. In this article, we examine for both Gigabit PON and Ethernet PON, the extent to which DBA performance degradation can be reduced by exploiting multi-threading. It is found that for both standards, multi-threading, if done properly, can be used to mitigate the performance degradation due to the increased reach. To make Bandwidth allocation efficient, new schemes for coordinating the multiple threads are required in long reach PON.
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a comparison of Dynamic Bandwidth allocation for epon gpon and next generation tdm pon
IEEE Communications Magazine, 2009Co-Authors: Bjorn Skubic, Jawwad Ahmed, Lena Wosinska, Jiajia Chen, Biswanath MukherjeeAbstract:Dynamic Bandwidth allocation in passive optical networks presents a key issue for providing efficient and fair utilization of the PON upstream Bandwidth while supporting the QoS requirements of different traffic classes. In this article we compare the typical characteristics of DBA, such as Bandwidth utilization, delay, and jitter at different traffic loads, within the two major standards for PONs, Ethernet PON and gigabit PON. A particular PON standard sets the framework for the operation of DBA and the limitations it faces. We illustrate these differences between EPON and GPON by means of simulations for the two standards. Moreover, we consider the evolution of both standards to their next-generation counterparts with the bit rate of 10 Gb/s and the implications to the DBA. A new simple GPON DBA algorithm is used to illustrate GPON performance. It is shown that the length of the polling cycle plays a crucial but different role for the operation of the DBA within the two standards. Moreover, only minor differences regarding DBA for current and next-generation PONs were found.
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Multi-thread polling: A Dynamic Bandwidth distribution scheme in long-reach PON
IEEE Journal on Selected Areas in Communications, 2009Co-Authors: Huan Song, Byoung-whi Kim, Biswanath MukherjeeAbstract:With the advances in optical technology, the span of a broadband access network using passive optical network (PON) technology can be increased from today's standard of 20 km to 100 km or higher, and thereby serve a lot more users. Such an extended-reach PON is known as SuperPON in the literature, and we call it a long-reach PON (LR-PON). A major challenge in LR-PON is that the propagation delay (for data as well as control signals) between the telecom central office (CO) and the end user is increased by a very significant amount. Now, traditional PON algorithms for scheduling the upstream transmission, such as Dynamic Bandwidth allocation (DBA) algorithms, may not be sufficient; actually, they may lead to degraded performance because of the long delay of the CO-to- Users "control loop." This challenge motivates us to propose and study a multi-thread polling algorithm to effectively and fairly distribute the upstream Bandwidth Dynamically. This algorithm exploits the benefits of having multiple polling processes running simultaneously and enabling users to send Bandwidth requests before receiving acknowledgement from the CO. We compare the proposed algorithm with traditional DBA, and show its advantage on average packet delay. We then analyze and optimize key parameters of the algorithm, such as initiating and tuning multiple threads, inter-thread scheduling, and fairness among users. Numerical results demonstrate the algorithm's advantage to decrease the average packet delay and improve network throughput under varying offered loads.
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ipact a Dynamic protocol for an ethernet pon epon
IEEE Communications Magazine, 2002Co-Authors: Glen Kramer, Biswanath Mukherjee, Gerry PesaventoAbstract:We investigate design issues for access networks based on passive optical network technology. A PON based on polling, with data encapsulated in Ethernet frames, possesses many desirable qualities, such as Dynamic Bandwidth distribution, use of a single downstream and a single upstream wavelength, ability to provision a fractional wavelength capacity to each user, and ease of adding a new user. To support Dynamic Bandwidth distribution, we propose an interleaved polling algorithm called IPACT. We also suggest a scheme for in-band signaling that allows using a single wavelength for both downstream data and control message transmission. To obtain realistic simulation results, we generated synthetic traffic that exhibits the properties of self-similarity and long-range dependence. We then analyzed the network performance under varying offered loads.
Elaine Wong - One of the best experts on this subject based on the ideXlab platform.
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bayesian estimation and prediction based Dynamic Bandwidth allocation algorithm for sleep doze mode passive optical networks
Journal of Lightwave Technology, 2014Co-Authors: Maluge Pubuduni Imali Dias, Sachintha B Karunaratne, Elaine WongAbstract:In this paper, we propose a new Bayesian estimation and prediction-based Just-In-Time Dynamic Bandwidth allocation algorithm. The algorithm exploits the sleep and doze capabilities of a 10-Gbps vertical-cavity surface-emitting laser optical network unit (ONU) for improved energy-efficiency across all network loads. The main objectives of the proposed algorithm are to: (a) effectively estimate the average interarrival time of packets for sleep and doze control; (b) transition the ONUs from sleep or doze modes into active mode Just-In-Time to receive packets from the optical line terminal (OLT); and (c) minimize the additional queuing delays introduced by the sleep- and doze-mode operations. The algorithm uses Bayesian estimation to effectively estimate the average interarrival time of packets at the ONUs. The OLT determines the sleep or doze time of an ONU based on the estimated average interarrival time information. Multipoint control protocol messages such as GATE and REPORT are used to transition the ONUs from sleep or doze mode into active mode Just-In-Time to receive packets from the OLT. The prediction mechanism of the proposed algorithm, deployed at the OLT, predicts the number of packets accumulated during the sleep or doze time and minimizes the additional queuing delay introduced by the sleep- and doze-mode operations. Simulation results indicate that the proposed algorithm results in 63% of energy-savings, compared to an always active ONU without sleep/doze operation. Our results further show that using the prediction mechanism, delay values can be reduced by 13 % at low network loads with only an increase of 0.01% in average power consumption at the ONU.
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single receiver dual channel Dynamic Bandwidth algorithm for local storage vod delivery
Global Communications Conference, 2013Co-Authors: Sandu Abeywickrama, Elaine WongAbstract:Video-on-demand has been highlighted as one of the highest growing traffic generators to the global IP networks. Benefits of using distributed caching servers within passive optical networks to optimize the traditional video-on-demand delivery has been discussed in literature. In our previous work, we introduced a dual-receiver Dynamic Bandwidth allocation algorithm to improve such video-on-demand services using a local storage placed within the access network. The main drawback of this algorithm lies in the additional power consumption at the optical network unit that arise from using two receivers. In this paper, we extend our study to present a novel single-receiver dual-channel Dynamic Bandwidth allocation algorithm to further optimize local storage based video-on-demand delivery over passive optical networks. Through packet-level simulations and formulation of power consumption models, we show that this algorithm improves energy-efficiency without compromising the quality-of-service performance of the network.
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sleep doze controlled Dynamic Bandwidth allocation algorithms for energy efficient passive optical networks
Optics Express, 2013Co-Authors: Maluge Pubuduni Imali Dias, Elaine WongAbstract:In this work, we present a comparative study of two just-in-time (JIT) Dynamic Bandwidth allocation algorithms (DBAs), designed to improve the energy-efficiency of the 10 Gbps Ethernet passive optical networks (10G-EPONs). The algorithms, termed just-in-time with varying polling cycle times (JIT) and just-in-time with fixed polling cycle times (J-FIT), are designed to achieve energy-savings when the idle time of an optical network unit (ONU) is less than the sleep-to-active transition time. This is made possible by a vertical-cavity surface-emitting laser (VCSEL) ONU that can transit into sleep or doze modes during its idle time. We evaluate the performance of the algorithms in terms of polling cycle time, power consumption, percentage of energy-savings, and average delay. The energy-efficiency of a VCSEL ONU that can transition into sleep or doze mode is compared to an always-ON distributed feedback (DFB) laser ONU. Simulation results indicate that both JIT and J-FIT DBA algorithms result in improved energy-efficiency whilst J-FIT performs better in terms of energy-savings at low network loads. The J-FIT DBA however, results in increased average delay in comparison to the JIT DBA. Nonetheless, this increase in average delay is within the acceptable range to support the quality of service (QoS) requirements of the next-generation access networks.
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efficient Dynamic Bandwidth allocation based on upstream broadcast in ethernet passive optical networks
Optical Fiber Communication Conference, 2005Co-Authors: Elaine Wong, Changjoon ChaeAbstract:We propose a novel Dynamic Bandwidth allocation scheme that exploits a physical layer architecture to facilitate upstream broadcast in an EPON. The network meets stringent QoS requirements, achieves high channel utilization and optimizes downstream capacity.
Piet Demeester - One of the best experts on this subject based on the ideXlab platform.
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energy efficient Dynamic Bandwidth allocation for ethernet passive optical networks
Optical Switching and Networking, 2015Co-Authors: Abhishek Dixit, Bart Lannoo, Didier Colle, Mario Pickavet, Piet DemeesterAbstract:Energy efficiency and green communications have become well-established themes for next-generation communications systems, with specific regard to reducing carbon footprint, lowering environmental impact, and minimizing operational expenditures. Apart from conforming to the required societal green agenda, there are also many practical and financial advantages to creating solutions that exhibit such benefits. Extending the advantages of energy efficiency to access networks is paramount as it is the major contributor of energy consumption in the Internet. Among the various factors of energy consumption in access networks, optical network units (ONUs) at the customer's premises consume the bulk of energy: ONUs consume about 60-70% of the energy consumed in current fiber-to-the-home networks. In this paper, we propose a Dynamic Bandwidth allocation (DBA) algorithm for Ethernet passive optical networks (EPONs). The DBA algorithm exploits the sleep mode functionality, in which the optical network unit (ONU) is put into sleep according to the traffic load of the ONU. We explore the DBA paradigm for two kinds of ONUs: legacy (with large sleep overheads) and next generation (with small sleep overheads). We also extend the DBA algorithm with a variety of grant sizing (Bandwidth allocation) schemes. The DBA algorithm achieves significant power savings in comparison to traditional power-ignore DBAs.
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Dynamic Bandwidth allocation with optimal wavelength switching in twdm pons
International Conference on Transparent Optical Networks, 2013Co-Authors: Abhishek Dixit, Bart Lannoo, Didier Colle, Mario Pickavet, Piet DemeesterAbstract:Time and wavelength division multiplexed passive optical networks (TWDM-PONs) have been widely considered as one of the next evolutionary steps of optical access networks. A variety of algorithms exists that explore the problem of scheduling and wavelength assignment in TWDM-PONs. These algorithms, however, allow unlimited switching of wavelengths. In reality, wavelength switching increases guard bands due to the tuning and the switching time of components, limiting channel utilization and increasing packet delays. We propose a novel Dynamic Bandwidth allocation (DBA) algorithm for TWDM-PON that minimizes the performance degradation due to excessive wavelength switching.
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Dynamic Bandwidth allocation with sla awareness for qos in ethernet passive optical networks
IEEE\ OSA Journal of Optical Communications and Networking, 2013Co-Authors: Abhishek Dixit, Bart Lannoo, Didier Colle, Mario Pickavet, Goutam Das, Piet DemeesterAbstract:Quality-of-service (QoS) support in Ethernet passive optical networks is a crucial concern. We propose a new Dynamic Bandwidth allocation (DBA) algorithm for service differentiation that meets the service-level agreements (SLAs) of the users. The proposed delay-aware (DA) online DBA algorithm provides constant and predictable average packet delay and reduced delay variation for the high- and medium-priority traffic while keeping the packet loss rate under check. We prove the effectiveness of the proposed algorithm by exhaustive simulations.
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energy efficient Dynamic Bandwidth allocation for ethernet passive optical networks
2012 IEEE International Conference on Advanced Networks and Telecommunciations Systems (ANTS), 2012Co-Authors: Abhishek Dixit, Bart Lannoo, Didier Colle, Mario Pickavet, Piet DemeesterAbstract:We propose a Dynamic Bandwidth allocation (DBA) algorithm for Ethernet passive optical networks (EPON). The DBA algorithm exploits the sleep mode functionality, where the optical network unit (ONU) at the user premises is put to sleep in every cycle according to the traffic load of the ONU. The DBA algorithm achieves up to 93% power savings in comparison to traditional power-ignore DBAs.
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analytical model for the ipact Dynamic Bandwidth allocation algorithm for epons
Journal of Optical Networking, 2007Co-Authors: Bart Lannoo, Didier Colle, Mario Pickavet, Lieven Verslegers, Maurice Gagnaire, Piet DemeesterAbstract:Feature Issue on Passive Optical Network Architectures and TechnologiesWe describe the research that has been performed in the field of the Dynamic Bandwidth allocation algorithm, interleaved polling with adaptive cycle time (IPACT), for Ethernet passive optical networks (EPON). The main focus has been on modeling packet delay analytically. To derive the packet delay, an important part of the analysis will also focus on the cycle time. It is assumed that the traffic load is symmetric, that packet arrivals are Poisson distributed, and that packets have fixed size. Simulations were performed to prove the accuracy of the analytical model. Some extensions and limitations of the model are treated, including asymmetric traffic load, packet size distribution, self-similar traffic, and differentiated services.
Sajaa Kh Sadon - One of the best experts on this subject based on the ideXlab platform.
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efficient Dynamic Bandwidth allocation for upstream epon with global priority
Student Conference on Research and Development, 2010Co-Authors: N A M Radzi, Norashidah Md Din, Mohammed Hayder Almansoori, Sajaa Kh Sadon, M S A MajidAbstract: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.
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intelligent Dynamic Bandwidth allocation algorithm in upstream epons
IEEE\ OSA Journal of Optical Communications and Networking, 2010Co-Authors: N A M Radzi, Norashidah Md Din, Mohammed Hayder Almansoori, Intan Shafinaz Mustafa, Sajaa Kh SadonAbstract:An upstream access scheme for Ethernet passive optical networks, called the intelligent fuzzy-logic-based Dynamic Bandwidth allocation algorithm (IFLDBA) has been proposed. The algorithm provides the allotment of Bandwidth between optical network units (ONUs) and within ONUs. Fuzzy logic is used to improve the Bandwidth allocation within each ONU. We compare the IFLDBA algorithm with the existing broadcast polling algorithm. The results show that IFLDBA has Bandwidth utilization of up to 21% better and lower delay than the broadcast polling algorithm.
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enhanced hierarchical Dynamic Bandwidth allocation algorithm with excess Bandwidth and sla techniques for upstream ethernet pon
International Conference on Computer and Electrical Engineering, 2009Co-Authors: Sajaa Kh Sadon, N A M Radzi, Norashidah Md Din, Mohammed Hayder Almansoori, Intan Shafinaz Mustafa, Mashkuri YaacobAbstract: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).
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enhanced Dynamic Bandwidth allocation for upstream ethernet pon
IEEE Symposium on Industrial Electronics and Applications, 2009Co-Authors: Sajaa Kh Sadon, Norashidah Md Din, Nurul Asyikin M R, Intan Sh Mostafa, Mashkuri YaacobAbstract:Ethernet Passive Optical Network (EPON) is a promising solution for access network. In this paper, we propose an enhanced Sharing DBA algorithm (SDBA) that supports multiple priority queues and fairness among optical network units (ONUs) over upstream EPON. We conduct simulation using MATLAB to study the performance and validate the effectiveness of the proposed algorithm in terms of fairness, throughput and packet delay. From the result, it has been shown that the proposed algorithm improves the Quality of Service (QoS) for EPON.
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efficient Dynamic Bandwidth allocation algorithm for upstream epon
International Conference on Communications, 2009Co-Authors: N A M Radzi, Norashidah Md Din, Mohammed Hayder Almansoori, Intan Shafinaz Mustafa, Sajaa Kh SadonAbstract:In this paper, an efficient Dynamic Bandwidth allocation (DBA) algorithm based fuzzy logic for upstream Ethernet passive optical networks (EPON) is proposed. The algorithm provides the allotment of Bandwidth for inter optical network unit (ONU) and intra ONU. We compared the performance of DBA algorithm based fuzzy logic and DBA algorithm without fuzzy logic in terms of Bandwidth utilization and delay. The results shows that the usage of fuzzy logic improve the Bandwidth utilization up to 20% and about 50% reduction on the system delay is achieved.
Massimo Tornatore - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Bandwidth and wavelength allocation scheme for next-generation wavelength-agile EPON
IEEE OSA Journal of Optical Communications and Networking, 2017Co-Authors: Lin Wang, Massimo Tornatore, Xinbo Wang, Hwan Seok Chung, Soomyung Park, Biswanath MukherjeeAbstract:Recently, the IEEE 802.3 Ethernet Working Group has classified three architectures for the nextgeneration Ethernet passive optical network (NG-EPON). They are called single-scheduling domain (SSD) PON, multi-scheduling domain (MSD) PON, and wavelength-agile (WA) PON, and they differ based on how a group of optical network units (ONUs) share awavelength. Existing Dynamic Bandwidth and wavelength allocation (DBWA) schemes for conventional EPON can be applied to MSD-PON and SSDPON, but not WA-PON. This is because WA-PON is a new architecture with full flexibility where a flexible number of wavelengths can be assigned to one ONU, and multiple ONUs can transmit at the same time. In this work, we develop a mathematical model and a novel DBWA scheme for transmission scheduling in WA-PON. However, as WA-PON incurs penalties in terms of delay and power consumption when an ONU activates its transmissions on new wavelengths, a trade-off between energy saving and data-transfer latency reduction needs to be carefully addressed when performing transmission scheduling. So, we develop a power-consumption model and modify the proposed DBWA scheme to enhance the energy efficiency ofWA-PON. Finally, we conduct simulation experiments for performance evaluation of the three PON architectures in terms of latency and packet loss ratio.We quantitatively investigate the influence of various parameters, such as the number of ONU transceivers and ONU buffer size, onWA-PON latency and packet loss ratio, and we evaluate the energy efficiency gain of the modified DBWA scheme.
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a multi threaded Dynamic Bandwidth and wavelength allocation scheme with void filling for long reach wdm tdm pons
Journal of Lightwave Technology, 2013Co-Authors: Anna Uttaboni, M De Andrade, Massimo TornatoreAbstract:Dynamic Bandwidth Allocation (DBA) is a major research challenge in the migration of Passive Optical Networks (PON) systems towards Long Reach PON, especially when hybrid WDM/TDM is used (LR WDM/TDM PON). New solutions for Dynamic Bandwidth and Wavelength Assignment (DBWA) are sought to address two main critical issues of such PON systems: how to schedule the transmissions over multiple wavelengths and how to efficiently exploit the Bandwidth in presence of long propagation delays of long reach scenarios. In this work, for the first time, we investigate the Multi-thread polling in a LR WDM/TDM PON. Then, we propose a new DBWA scheme, called EFT-partial-VF Multi-threaded, which effectively combines some of the features of, the Earliest Finish Time with Void Filling (EFT-VF) algorithm, with the Multi-thread algorithm. The two proposed solutions, namely the MT algorithm and the EFT-partial-VF Multi-threaded algorithm, provide significant improvement in terms of average delay, if compared with existing algorithms such as the EFT and the EFT-VF. Besides this, we extend the definition of polling cycle to hybrid WDM/TDM PON and we provide a method to calculate it.
