The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform

Yuanyuan Yang - One of the best experts on this subject based on the ideXlab platform.

  • Multicast connection capacity of WDM Switching Networks with limited wavelength conversion
    IEEE ACM Transactions on Networking, 2004
    Co-Authors: Xiangdong Qin, Yuanyuan Yang
    Abstract:

    Currently, many bandwidth-intensive applications require multicast services for efficiency purposes. In particular, as wavelength division multiplexing (WDM) technique emerges as a promising solution to meet the rapidly growing demands on bandwidth in present communication Networks, supporting multicast at the WDM layer becomes an important yet challenging issue. In this paper, we introduce a systematic approach to analyzing the multicast connection capacity of WDM Switching Networks with limited wavelength conversion. We focus on the practical all-optical limited wavelength conversion with a small conversion degree d (e.g., d = 2 or 3), where an incoming wavelength can be switched to one of the d outgoing wavelengths. We then compare the multicast performance of the network with limited wavelength conversion to that of no wavelength conversion and full wavelength conversion. Our results demonstrate that limited wavelength conversion with small conversion degrees provides a considerable fraction of the performance improvement obtained by full wavelength conversion over no wavelength conversion. We also present an economical multistage Switching architecture for limited wavelength conversion. Our results indicate that the multistage Switching architecture along with limited wavelength conversion of small degrees is a cost-effective design for WDM multicast Switching Networks.

  • ICC - Multicast scheduling in WDM Switching Networks
    IEEE International Conference on Communications 2003. ICC '03., 2003
    Co-Authors: Zhenghao Zhang, Yuanyuan Yang
    Abstract:

    Optical WDM Networks are attracting more and more attention because of its huge bandwidth to meet ever increasing demand of modern networking applications. In this paper we study supporting multicast in WDM Switching Networks. Multicast is the operation to send information from one source to multiple destinations. In WDM Switching Networks, contention occurs when one output fiber is the destination of more than k inputs, where k is the number of wavelengths on each fiber. In this paper, we study scheduling algorithms which can select a group of multicast connection requests that are contention-free. We first prove that the problem of scheduling the maximum number of such connection requests through the network simultaneously is NP-hard. On the other hand, lack of optical buffers in WDM Switching Networks requires a very fast scheduling algorithm. We then turn to develop approximation scheduling algorithms that can provide sub-optimal solutions. We present four polynomial approximation scheduling algorithms and study their performance through simulations. We also discuss their performance ratio to the optimal algorithm. Our results demonstrate that one of the simple algorithms (the fastest one) yields throughput close to other three more complex algorithms, thus could be a good candidate for multicast scheduling in WDM Switching Networks.

  • nonblocking wdm Switching Networks with full and limited wavelength conversion
    IEEE Transactions on Communications, 2002
    Co-Authors: Yuanyuan Yang
    Abstract:

    In previous years, with the rapid exhaustion of the capacity in wide area Networks led by Internet and multimedia applications, demand for high bandwidth has been growing at a very fast pace. Wavelength-division multiplexing (WDM) is a promising technique for utilizing the huge available bandwidth in optical fibers. We consider efficient designs of nonblocking WDM permutation Switching Networks. Such designs require nontrivial extensions from the existing designs of electronic Switching Networks. We first propose several permutation models in WDM Switching Networks ranging from no wavelength conversion, to limited wavelength conversion, to full wavelength conversion, and analyze the network performance in terms of the permutation capacity and network cost, such as the number of optical cross-connect elements and the number of wavelength converters required for each model. We then give two methods for constructing nonblocking multistage WDM Switching Networks to reduce the network cost.

  • nonblocking wdm Switching Networks with full and limited wavelength conversion
    International Conference on Computer Communications and Networks, 2001
    Co-Authors: Yuanyuan Yang
    Abstract:

    In recent years, with the rapid exhaustion of the capacity in wide area Networks (WAN) led by Internet and multimedia applications, demand for high bandwidth has been growing at a very fast pace. Wavelength division multiplexing (WDM) is a promising technique to utilize the huge available bandwidth in optical fibers. We consider efficient designs of nonblocking WDM permutation Switching Networks. Such designs require nontrivial extensions from the existing designs of electronic Switching Networks. We first propose several permutation models in WDM Switching Networks ranging from no wavelength conversion, limited wavelength conversion, to full wavelength conversion, and analyze the network performance in terms of the permutation capacity and network cost such as the number of optical crossconnect elements and the number of wavelength converters required for each model. We then give two methods for constructing nonblocking multistage WDM Switching Networks to reduce the network cost.

  • NCA - Blocking probability in WDM multicast Switching Networks with limited wavelength conversion
    Second IEEE International Symposium on Network Computing and Applications 2003. NCA 2003., 1
    Co-Authors: Xiangdong Qin, Yuanyuan Yang
    Abstract:

    Currently, many bandwidth-intensive applications require multicast services for efficiency purposes. In particular, as wavelength division multiplexing (WDM) technique emerges as a promising solution to meet the rapidly growing demands on bandwidth in present communication Networks, supporting multicast at the WDM layer becomes an important yet challenging issue. In this paper, we present a new analytical model to compute blocking probabilities for multicast connections in WDM Switching Networks. Due to the non-uniform nature of multicast traffic, calculating blocking probability in a WDM multicast Switching network becomes much more challenging than that under unicast traffic. Based on the link independence and wavelength independence assumptions, our model can calculate the blocking probability of any multicast connection from a single source to multiple destinations in WDM Switching Networks with various types of wavelength conversion capabilities, ranging from no wavelength conversion, to limited wavelength conversion, to full wavelength conversion. Our analytical results indicate that similar to unicast traffic, a significant improvement in the blocking performance of the network under multicast traffic can be achieved by limited wavelength conversion. We view that utilizing limited wavelength conversion with relatively small conversion degrees in WDM multicast Switching Networks is a more cost-effective choice. We also validate the analytical model through extensive simulations.

Mariusz Glabowski - One of the best experts on this subject based on the ideXlab platform.

  • internal blocking probability calculation in Switching Networks with additional inter stage links and engset traffic
    Communication Systems Networks and Digital Signal Processing, 2012
    Co-Authors: Mariusz Glabowski, Michal Dominik Stasiak
    Abstract:

    This paper presents a method for modeling Switching Networks with overflow links that are offered multi-service traffic generated by a limited number of sources. A particular emphasis is put on the possibility to achieve a significant reduction in the blocking probability in the Switching network that will result from the application of additional overflow links in the first stage of the Switching network. Additionally, the paper proves that the accuracy of the proposed method for Switching Networks with Engset traffic is not lower than that for Networks with Erlang traffic. The results of the analytical calculations are compared with the results obtained during the simulation experiments, which confirms the correctness and validity of all adopted theoretical assumptions.

  • Recurrent Calculation of Blocking Probability in Multiservice Switching Networks
    2006 Asia-Pacific Conference on Communications, 2006
    Co-Authors: Mariusz Glabowski
    Abstract:

    This paper presents a new analytical recurrent method of blocking probability calculation in multistage multiservice Switching Networks. The method is based on the concept of effective availability. The results of analytical calculations of the probabilities of blocking are compared with the simulation results of multistage Switching Networks, and, therefore, the validity of the assumptions used in the model is proved.

  • Point-to-point blocking probability in Switching Networks with reservation
    Annales Des Télécommunications, 2002
    Co-Authors: Mariusz Glabowski, Maciej Stasiak
    Abstract:

    In this paper reservation algorithms for multi-service Switching Networks are proposed. Two new approximate methods of the point-to-point blocking probability calculation in the multi-service Switching Networks are also presented in the paper. These methods can be used for blocking calculation in the Switching Networks with and without reservation. Special attention is paid to the method for determining the effective availability, which directly affects the accuracy of the final results. The results of analytical calculations are compared with the data of digital simulation of Switching Networks without and with reservation.

  • Point-to-point blocking probability in Switching Networks with reservation
    1999
    Co-Authors: Maciej Stasiak, Mariusz Glabowski
    Abstract:

    In this paper reservation algorithms for multiservice Switching Networks are proposed. A new approximate method of point-to-point blocking probability calculation in the multiservice Switching Networks is also presented in the paper. This method can be used for blocking calculation in the Switching Networks without and with reservation. The results of calculations are compared with the data of digital simulation of Switching Networks.

  • Blocking probability in the multi-service Switching Networks with multicast traffic
    2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCo, 1
    Co-Authors: Maciej Stasiak, Piotr Zwierzykowski, Mariusz Glabowski
    Abstract:

    In this paper, a new approximate method of point-to-group blocking probability calculation in Switching Networks carrying a mixture of different multi-rate unicast and multicast traffic streams is presented. Special attention is paid to the methods for determining the effective availability parameter in the case of multicast connections. The results of analytical calculations are compared with the data of digital simulations of Switching Networks with unicast and multicast connections.

Maciej Stasiak - One of the best experts on this subject based on the ideXlab platform.

  • Modelling of Switching Networks with Multi-service Sources and Multicast Connections in the Last Stage
    Image Processing and Communications, 2020
    Co-Authors: M Sobieraj, Maciej Stasiak, Piotr Zwierzykowski
    Abstract:

    This article proposes a new calculation methods for a determination of traffic characteristics in Switching Networks with multi-service traffic sources carrying multicast traffic. In the Switching Networks were implemented two scenarios of selecting subsequent links which belongs to a given multicast connection. The analytical method described in the paper can be used to determine the point-to-point blocking probability in Switching Networks with multicast connections. In this method, each traffic source can generate calls of different service classes. The proposed calculation method is approximate, therefore the results of calculations are compared with the results of simulation experiments. The simulation results confirm acceptable accuracy of the proposed analytical method.

  • QSHINE - QoS Criteria for Energy-Aware Switching Networks
    Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering, 2019
    Co-Authors: Mariusz Głąbowski, Maciej Stasiak, Michał Dominik Stasiak
    Abstract:

    This article proposes a method to determine the QoS parameters for energy-aware multiservice Switching Networks. The initial assumption is that a decrease in the power uptake by the network can be achieved by a temporary switch-off of a certain number of switches. To this end, the article develops methods for a determination of the blocking probability in Switching Networks with a variable number of switches. The results of the analytical calculations are then compared with the results of simulation experiments for a selected number of structures of Switching Networks. The study reveals the good accuracy of the proposed model. The results obtained in the study can be applied in constructing energy-aware Switching Networks.

  • Point-to-point blocking probability in Switching Networks with reservation
    Annales Des Télécommunications, 2002
    Co-Authors: Mariusz Glabowski, Maciej Stasiak
    Abstract:

    In this paper reservation algorithms for multi-service Switching Networks are proposed. Two new approximate methods of the point-to-point blocking probability calculation in the multi-service Switching Networks are also presented in the paper. These methods can be used for blocking calculation in the Switching Networks with and without reservation. Special attention is paid to the method for determining the effective availability, which directly affects the accuracy of the final results. The results of analytical calculations are compared with the data of digital simulation of Switching Networks without and with reservation.

  • Point-to-group blocking in the Switching Networks with unicast and multicast Switching
    Performance Evaluation, 2002
    Co-Authors: Maciej Stasiak, Piotr Zwierzykowski
    Abstract:

    In this paper, a new approximate effective availability method of the point-to-group blocking probability calculation in Switching Networks carrying a mixture of different multi-rate unicast and multicast traffic streams is presented. Until recently, such methods have only been proposed for the single-services Switching Networks. To the best of our knowledge, methods of blocking probability calculation for multi-service Switching network with multicast connection have not yet been considered. In this paper, four algorithms of setting-up multicast connections in multi-service Switching Networks are considered and discussed. Special attention is paid to the methods for determining the effective availability parameter in the case of multicast connections. The results of the analytical calculations are compared with the data of the digital simulations of the Switching Networks with unicast and multicast connections.

  • point to point blocking probability in the Switching Networks with unicast and multicast traffic streams
    International Conference on Communications, 2001
    Co-Authors: Maciej Stasiak, Piotr Zwierzykowski
    Abstract:

    A new approximate method of blocking probability calculation in multi-service Switching Networks carrying a mixture of different multi-rate unicast and multicast traffic streams is presented. Three algorithms of setting up multicast connections are considered and discussed. Special attention is paid to the methods for determining the effective availability parameter for multicast connections. The results of the analytical calculations of the blocking probability are compared with the data of discrete event simulations of the Switching Networks.

Hideo Miyahara - One of the best experts on this subject based on the ideXlab platform.

  • performance of alternate routing methods in all optical Switching Networks
    International Conference on Computer Communications, 1997
    Co-Authors: Hiroaki Harai, Masayuki Murata, Hideo Miyahara
    Abstract:

    We study routing methods in all-optical Switching Networks. In all-optical Switching Networks, the connection with more hops encounters more call blocking, and it is especially true in optical Networks with no wavelength conversions. We therefore consider an alternate routing method with limited trunk reservation in which connections with more hops are prepared more alternate routes. Through developing an approximate analytic approach, we show that our method keeps good performance when compared with the existing alternate routing methods, and also that the fairness among connections can be improved. Further performance improvement is investigated by introducing a wavelength assignment policy and a dynamic routing method. An effectiveness of the proposed method is investigated through simulation.

  • INFOCOM - Performance of alternate routing methods in all-optical Switching Networks
    Proceedings of INFOCOM '97, 1
    Co-Authors: Hiroaki Harai, Masayuki Murata, Hideo Miyahara
    Abstract:

    We study routing methods in all-optical Switching Networks. In all-optical Switching Networks, the connection with more hops encounters more call blocking, and it is especially true in optical Networks with no wavelength conversions. We therefore consider an alternate routing method with limited trunk reservation in which connections with more hops are prepared more alternate routes. Through developing an approximate analytic approach, we show that our method keeps good performance when compared with the existing alternate routing methods, and also that the fairness among connections can be improved. Further performance improvement is investigated by introducing a wavelength assignment policy and a dynamic routing method. An effectiveness of the proposed method is investigated through simulation.

Xiangdong Qin - One of the best experts on this subject based on the ideXlab platform.

  • Multicast connection capacity of WDM Switching Networks with limited wavelength conversion
    IEEE ACM Transactions on Networking, 2004
    Co-Authors: Xiangdong Qin, Yuanyuan Yang
    Abstract:

    Currently, many bandwidth-intensive applications require multicast services for efficiency purposes. In particular, as wavelength division multiplexing (WDM) technique emerges as a promising solution to meet the rapidly growing demands on bandwidth in present communication Networks, supporting multicast at the WDM layer becomes an important yet challenging issue. In this paper, we introduce a systematic approach to analyzing the multicast connection capacity of WDM Switching Networks with limited wavelength conversion. We focus on the practical all-optical limited wavelength conversion with a small conversion degree d (e.g., d = 2 or 3), where an incoming wavelength can be switched to one of the d outgoing wavelengths. We then compare the multicast performance of the network with limited wavelength conversion to that of no wavelength conversion and full wavelength conversion. Our results demonstrate that limited wavelength conversion with small conversion degrees provides a considerable fraction of the performance improvement obtained by full wavelength conversion over no wavelength conversion. We also present an economical multistage Switching architecture for limited wavelength conversion. Our results indicate that the multistage Switching architecture along with limited wavelength conversion of small degrees is a cost-effective design for WDM multicast Switching Networks.

  • NCA - Blocking probability in WDM multicast Switching Networks with limited wavelength conversion
    Second IEEE International Symposium on Network Computing and Applications 2003. NCA 2003., 1
    Co-Authors: Xiangdong Qin, Yuanyuan Yang
    Abstract:

    Currently, many bandwidth-intensive applications require multicast services for efficiency purposes. In particular, as wavelength division multiplexing (WDM) technique emerges as a promising solution to meet the rapidly growing demands on bandwidth in present communication Networks, supporting multicast at the WDM layer becomes an important yet challenging issue. In this paper, we present a new analytical model to compute blocking probabilities for multicast connections in WDM Switching Networks. Due to the non-uniform nature of multicast traffic, calculating blocking probability in a WDM multicast Switching network becomes much more challenging than that under unicast traffic. Based on the link independence and wavelength independence assumptions, our model can calculate the blocking probability of any multicast connection from a single source to multiple destinations in WDM Switching Networks with various types of wavelength conversion capabilities, ranging from no wavelength conversion, to limited wavelength conversion, to full wavelength conversion. Our analytical results indicate that similar to unicast traffic, a significant improvement in the blocking performance of the network under multicast traffic can be achieved by limited wavelength conversion. We view that utilizing limited wavelength conversion with relatively small conversion degrees in WDM multicast Switching Networks is a more cost-effective choice. We also validate the analytical model through extensive simulations.

  • ICCCN - Blocking probability in WDM Switching Networks with limited wavelength conversion
    Proceedings. Eleventh International Conference on Computer Communications and Networks, 1
    Co-Authors: Xiangdong Qin, Yuanyuan Yang
    Abstract:

    We study the benefits of wavelength conversion in all-optical WDM Switching Networks. In particular, we focus on investigating network performance improvement by using the more realistic limited wavelength conversion. We present an analytical model for calculating the blocking probability of WDM Switching Networks with limited wavelength conversion and validate the model through simulations. The analytical and simulation results reveal that a significant improvement in the blocking performance of the network can be achieved by limited wavelength conversion with small conversion degrees (e.g., d=2,3,4). We take the view that utilizing limited wavelength conversion with small conversion degrees in a WDM Switching network is a more cost-effective choice.