Power savings versus network performance in dynamically provisioned WDM networks

2012 ◽  
Vol 50 (5) ◽  
pp. 48-55 ◽  
Author(s):  
Pawel Wiatr ◽  
Paolo Monti ◽  
Lena Wosinska
Keyword(s):  
Network Performance ◽  
Wdm Networks

Network performance improvement in survivable WDM networks considering physical layer constraints

2009 ◽  
Author(s):  
Anna Tzanakaki ◽  
Kostas Georgakilas ◽  
Kostas Katrinis ◽  
Lena Wosinska ◽  
Amornrat Jirattigalachote ◽  
...  
Keyword(s):  
Performance Improvement ◽  
Network Performance ◽  
Physical Layer ◽  
Wdm Networks

scholarly journals Wavelength Converter Based Optimized RWA for All Optical Networks

2019 ◽  
Vol 8 (2) ◽  
pp. 111-115
Author(s):  
Shilpa S. Patil ◽  
Bharat S. Chaudhari
Keyword(s):  
Optical Networks ◽  
Network Performance ◽  
Blocking Probability ◽  
Wavelength Assignment ◽  
Wdm Networks ◽  
Optimal Placement ◽  
Wavelength Converters ◽  
Wavelength Converter ◽  
Call Blocking ◽  
Call Blocking Probability

Wavelength converters are used in WDM networks to avoid call blocking and minimizing the blocking probability. Optimal placement of wavelength converters restricts the call blocking probability, the complexity and improves the overall network performance of the network. In this paper, we propose a new weight dependent routing and wavelength assignment algorithm for the optimal placement of the wavelength converters. The wavelength converter placement was considered separately at all the nodes and the partial nodes. Our algorithm outperforms the previously reported studies and requires a lesser number of wavelength converters to achieve the required performance. It reduces the blocking probabilities up to 5.4% and shows that the first four nodes primarily control the blocking performance of the network. The study also reveals that instead of merely increasing the number of converters, their placement at the right location plays a crucial role in improving the performance. Initially, although an increase in the number of the wavelengths also improves the network performance, the further increase does not contribute much to the reduction of the blocking probability.

Network Performance Analysis with Nonlinear Effects

2015 ◽  
pp. 326-333
Keyword(s):  
Bit Error Rate ◽  
Network Performance ◽  
Nonlinear Effects ◽  
Wdm Networks ◽  
Wavelength Division ◽  
Wavelength Division Multiplexed ◽  
Street Networks ◽  
Dense Wdm ◽  
Significant Performance ◽  
Average Ber

The nonlinear Bit Error Rate (BER) performance of dense Wavelength Division Multiplexed (WDM) Manhattan Street Networks with deflection routing was obtained using a semi-analytical model. The chapter's results show that nonlinear effects impose significant performance penalties on dense WDM networks, both in terms of maximum hops attainable and average BER, and should be taken into account when modeling such networks. Simple techniques such as optimal amplifier positioning can mitigate some of the nonlinear penalties.

An Efficient Network Utilization Scheme for Optical Burst Switched Networks

2010 ◽  
Vol 3 (2) ◽  
pp. 34-49
Author(s):  
Rajneesh Randhawa ◽  
J.S. Sohal ◽  
Amit Kumar Garg ◽  
R. S. Kaler
Keyword(s):  
Network Model ◽  
Wavelength Division Multiplexing ◽  
Time Complexity ◽  
Network Performance ◽  
Hybrid Approach ◽  
Wdm Networks ◽  
Queuing Network ◽  
Simulation Results ◽  
Burst Assembly ◽  
Optical Burst

Optical Burst Switching (OBS) is one of the most important switching technologies for future IP over wavelength division multiplexing (WDM) networks. In OBS Network, the burst assembly technique is a challenging issue in the implementation of the system. Burst assembly influences burst characteristics, which negatively impacts network performance. In this paper, the authors propose an efficient hybrid burst assembly approach, which is based on approximate queuing network model. To reduce the time complexity, an approximate queuing network model has been considered. Throughput performance has been investigated, taking into account both burst loss probability and time complexity. Simulation results have shown that the proposed hybrid approach based on variable burst length threshold and fixed maximum time limitation provides Simulation results have also shown a good trade-off between burst blocking performance and scheduling time.

Pre-Adjustment Rerouting for Wavelength Defragmentation in Optical Transparent WDM Networks

2015 ◽  
Vol E98.B (10) ◽  
pp. 2014-2021
Author(s):  
Akihiro KADOHATA ◽  
Atsushi WATANABE ◽  
Akira HIRANO ◽  
Hiroshi HASEGAWA ◽  
Ken-ichi SATO
Keyword(s):  
Wdm Networks

Demand of Wireless Network and Security in Current Research

2015 ◽  
Vol 14 (6) ◽  
pp. 5809-5813
Author(s):  
Abhishek Prabhakar ◽  
Amod Tiwari ◽  
Vinay Kumar Pathak
Keyword(s):  
Wireless Networks ◽  
Quality Of Service ◽  
Wireless Network ◽  
Network Performance ◽  
Wireless Security ◽  
Human Intervention ◽  
Unauthorized Access ◽  
Quality Of Service Parameters ◽  
Wireless Infrastructure

Wireless security is the prevention of unauthorized access to computers using wireless networks .The trends in wireless networks over the last few years is same as growth of internet. Wireless networks have reduced the human intervention for accessing data at various sites .It is achieved by replacing wired infrastructure with wireless infrastructure. Some of the key challenges in wireless networks are Signal weakening, movement, increase data rate, minimizing size and cost, security of user and QoS (Quality of service) parameters... The goal of this paper is to minimize challenges that are in way of our understanding of wireless network and wireless network performance.

COORDINATED DISTRIBUTED SCHEDULING IN WIRELESS MESH NETWORK

2012 ◽  
Vol 3 (3) ◽  
pp. 368-374
Author(s):  
Usha Kumari ◽  
Udai Shankar
Keyword(s):  
Network Performance ◽  
Mesh Networks ◽  
Mac Protocol ◽  
Scheduling Algorithm ◽  
Ieee 802.16 ◽  
Distributed Scheduling ◽  
Mesh Network ◽  
Fourth Generation ◽  
Network Nodes ◽  
Wireless Mesh

IEEE 802.16 based wireless mesh networks (WMNs) are a promising broadband access solution to support flexibility, cost effectiveness and fast deployment of the fourth generation infrastructure based wireless networks. Reducing the time for channel establishment is critical for low latency/interactive Applications. According to IEEE 802.16 MAC protocol, there are three scheduling algorithms for assigning TDMA slots to each network node: centralized and distributed the distributed is further divided into two operational modes coordinated distributed and uncoordinated distributed. In coordinated distributed scheduling algorithm, network nodes have to transmit scheduling message in order to inform other nodes about their transfer schedule. In this paper a new approach is proposed to improve coordinated distributed scheduling efficiency in IEEE 802.16 mesh mode, with respect to three parameter Throughput, Average end to end delay and Normalized Overhead. For evaluating the proposed networks efficiency, several extensive simulations are performed in various network configurations and the most important system parameters which affect the network performance are analyzed

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