BITS Faculty Publications
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Item Performance Evaluation of Path Length based Routing Strategies for Survivable WDM Network(ACM Digital Library, 2016-03) Chaubey, V.K.The Wavelength routed optical network employs well preconfigured optical lightpaths to carry the traffic of users to communicate in the internet at an increasingly huge data rate. The optical network requires lightpaths to maintained, which has to be optimal to route the data traffic between a source to a destination. In most cases at such high data rate, the fault tolerant capability requires in wavelength routed optical network. Therefore to better utilize the resources the key challenge is to how intelligently route the traffic to the working and protection paths in an optical network. In this paper effect of path length in survivable routing and wavelength assignment in the wavelength division multiplexing networks have addressed. Here we investigated and evaluated that how the length of path affects the performance of the network in the selection of working primary paths and protection paths for dynamic traffic. Proposed scheme of path selection attempts to perform individual optimization for each connection request. The simulation results on various networks reveal that path length has a significant impact on the lightpaths selection and affects the call acceptance ratio and quality of network significantly.Item Maximum Network Flow Aware Multi-lightpath Survivable Routing in WDM Networks(ICTS, 2018) Chaubey, V.K.Item Wavelength converters in WDM networks-an improvement in call connection probability(NISCAIR, 2002) Chaubey, V.K.Call connection probability in an all optical network (AON) using wavelength division multiplexing (WDM) depends on the number of WDM wavelengths available in a link and on the network capability for wavelength conversion at network nodes. A simpler approach for calculation of call connection probability using wavelength converters has been provided. Expressions for call connection probability, with and without wavelength converters are derived and are combined in a converter availability model, so as to study the impact of wavelength conversion on call connection probability.Item Modeling and simulation of WDM optical networks under traffic control protocols(Elsevier, 2009-03) Chaubey, V.K.A proper node architecture design capable to support different network protocol enhances the data transport capability of a wavelength division multiplexed system. In the present paper a simple node architecture model has been developed to simulate the node throughput based on media access control protocols for bursty data traffic of variable time slot duration and data rate. An appropriate mathematical model has been derived to evaluate different types of traffic reservation protocols used in WDM networks. It has been observed that the network performance is well controlled through implemented protocols and network design parameters.Item Performance Analysis of All-Optical WDM Network with Wavelength Converter Using Erlang C Traffic Model(Springer, 2010) Chaubey, V.K.In this paper we have analyzed the performance of an all-optical WDM network for different parameters, such as number of channels, number of wavelengths associated, number of hops between source to destination etc. To establish a light path between two nodes wavelength continuity is a big constraint and to avoid this problem either wavelength converter or optical delay line or both may be used. Wavelength converter will convert the wavelength of the incoming signal into a desired wavelength at the output and the optical delay line will hold the incoming signal for a certain time. In this paper we considered that the network is equipped with wavelength converter and the traffic through the network is Erlang-C type. A mathematical model for the same has been devised and its performance has been analyzed with an investigation on collective impacts of various traffic parameters on transmission.Item Design and Simulation of Intelligent Optical WDM Switching Node Based on Erlang Traffic Model(Scientific Research, 2010) Chaubey, V.K.In this paper we propose a new architectural switching nodes consisting of two processing nodes that follow Erlang B and Erlang C traffic respectively. The developed model is used to best utilize the given number of output channels to achieve the least blocking probability. An appropriate mathematical model has been further devised and its call blocking probability has been enunciated. Performance of the model has been evaluated for different values of blocking probabilities. It has been observed that the performance of the network is well satisfactory for different design parameters.Item Survivable routing with path length constraint in WDM networks(IJAER, 2016) Chaubey, V.K.Wavelength-routed WDM optical network has the tremendous capability of providing overgrowing needs of higher bandwidth to the end users. It uses preconfigured optimal lightpaths to carry the traffic of users from one node to another node. Hence, an intelligent RWA algorithms required to be employed to achieve better performance of the network. In this paper, we investigate the impact of path lengths in the RWA problem. We study the effect of length of the path in the blocking performance of network when working and protection paths computed for the resiliency to an occurrence of single link failure in WDM network. Proposed algorithms will optimize individual connection request. In this work, we have simulated and analyzed the relative performances of the three RWA heuristics algorithms for survivable routing and wavelength assignment problem named as Shortest Path Pair (SPP), Shortest Longest Path Pair (SLPP) and Longest Shortest Path Pair (LSPP) strategy. These algorithms have been compared based on the percentage of successful light-paths established. The proposed heuristic strategies described here differs from each other in the length of the path of working and backup path. The simulation results reveal that SPP algorithm always outperforms in terms of call blocking performance ratio. Hence, for better network performance survivable RWA algorithm ensure to consider a pair of the shortest path as a working and protection path.Item WDM Network Topologies-A Probabilistic Model(IEEE, 2007) Chaubey, V.K.; Shekhawat, Virendra SinghThis paper presents a simple generic network model to evaluate the network performance of an optical network. A probabilistic traffic model for a WDM optical network employing a ring and a star topology has been developed to investigate the call connection probability and router performances respectively. The numerical results show a huge data transmission through the router with a least dependence on the routing time up to a significant data rate.Item A wavelength intersection cardinality based routing and wavelength assignment algorithm in optical WDM networks(ACM Digital Library, 2011) Chaubey, V.K.; Shekhawat, Virendra SinghOptimum route selection and wavelength assignment is a key aspect in Wavelength Division Multiplexed (WDM) optical network. In general the traffic forwarding decision under adaptive routing algorithms is function of the number of free channels on the links. This doesn't ensure the common wavelength availability on entire path. This paper presents a novel approach for traffic forwarding decision which ensures the wavelength continuity constraint between source and the destination node. The path selection algorithm used in this paper establishes the light path with less computational overhead and gives better throughput. The proposed algorithm is compared with traditional adaptive routing algorithm through computer simulation. Observations reveal that the new algorithm performs better by dipping Average Blocking Time of the Network (ABTN). In particular, it outperforms at higher traffic rates with limited number of channels per link.