BITS Faculty Publications
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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 Weight Based Edge Disjoint Path Routing and Wavelength Assignment (WEDP-RWA) Algorithm for WDM Networks(IEEE, 2008) Shekhawat, Virendra Singh; Chaubey, V.K.In this paper the problem of routing and wavelength assignment (RWA) in optical wavelength division multiplexing (WDM) networks has been addressed and a new weight based edge disjoint path (EDP) algorithm for RWA has been proposed to optimize the wavelength resources in a wavelength routed WDM networks. The simulation results reveal that the network topology characteristics and link utilization factor have a significant impact on light path selection for traffic routing to minimize the required number of wavelengths. The weight based RWA solution reports significant improvement in wavelength utilization in particular for large network with increase in the call request for a source destination pair.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.Item A novel multi-path data transmission algorithm for wavelength routed optical WDM networks(IEEE, 2011) Shekhawat, Virendra Singh; Chaubey, V.K.This paper investigates the traffic handling capability of wavelength routed optical WDM (Wavelength Division Multiplexing) network, exploiting multi-path transmission under a proposed adaptive link weight algorithm. Data transmission through multiple paths improves the connection probability by reducing the wavelength hold time on a link. Further it reduces traffic load on bottleneck links by distributing traffic over multiple paths in the network. The proposed algorithm uses multiple edge disjoint paths to mitigate the congestion problem through load balancing and improves the reliability. We study the effectiveness of the proposed algorithm using network simulation and estimate the call blocking probability for the given resources through a single and multi-path transmission to establish the superiority of the latter approach.Item A Novel Packet Switch Node Architecture for Contention Resolution in Synchronous Optical Packet Switched Networks(Scientific Research, 2009-09) Shekhawat, Virendra Singh; Chaubey, V.K.Packet contention is a key issue in optical packet switch (OPS) networks and finds a viable solution by including optical buffering techniques incorporating fiber delay lines (FDLs) in the switch architecture. The present paper proposes a novel switch architecture for packet contention resolution in synchronous OPS network employing the packet circulation in FDLs in a synchronized manner. A mathematical model for the proposed switch architecture is developed employing packet queuing control to estimate the blocking probability for the incoming traffic. The switch performance is analyzed with a suitable contention resolution al-gorithm through the computer simulation. The simulation results substantiate the proposed model for the switch architecture.Item Design and characterization of a modified WDM ring network – An analytical approach(Elsevier, 2012-06) Shekhawat, Virendra Singh; Chaubey, V.K.The present paper proposes the design of a modified ring network topology with a significant improvement in average delay and blocking probability over the simple ring network. The backbone ring network is modified by connecting the alternate nodes in regions identified statistically as of high traffic density. A mathematical model for the proposed modified network has been developed to investigate the blocking probability and average delay as the data traverses from source to destination. The analysis reports an improvement in the average delay performance with the inception of call priority at the processing node and thus provides a scope to implement the given grade of service.Item Resource efficient survivability approach for resilient WDM optical networks(ACM Digital Library, 2012) Shekhawat, Virendra Singh; Chaubey, V.K.This paper presents an overview of various existing network survivability techniques implemented in optical WDM networks and proposes an efficient network survivability approach. The proposed approach works on the principle of preplanned protection which adopts dynamic restoration strategy to improve the wavelength usages and call connection rate under single link failure scenario. The resiliency in the network is achieved through backup paths utilizing pre-provisioning at the time of connection establishment process and also by reserving wavelengths during the failure recovery time. The proposed approach has been analyzed and compared with the preplanned protection and dynamic restoration method through simulation to confirm an improvement in call acceptance ratio.Item Efficient Heuristic Algorithms for Routing and Wavelength Assignment in Optical WDM Networks(SSRN, 2012-11) Shekhawat, Virendra Singh; Chaubey, V.K.The paper presents two heuristic Routing and Wavelength Assignment (RWA) algorithms named Least Count First (LCF) and Least Recently Used First (LRUF) for light-path routing in optical WDM networks under dynamic traffic conditions to meet wavelength continuity constraint. The performance analysis of these two algorithms has been simulated to compare the findings with the existing Fixed Order (FO) algorithm. The analysis reports a significant improvement for the proposed algorithms over the FO algorithm in terms of connection requests handling capability, as the former needs less wavelength scans to satisfy a connection request.