A Novel Hybrid Scheme for Contention Minimization in Optical Burst Switched Network (original) (raw)
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Contention Resolution Technique based on Packet Switching in Optical Burst Switched Networks
Optical Burst Switching (OBS) is a data switching technique for upcoming computer networks, since this technique can perform data switching and data processing operations with high speed and efficiency. Its main goal is to get rid of problems found in two main techniques, which are, Optical Circuit Switching (OCS) and Optical Packet Switching (OPS). Routing deflection methods route bursts to other output ports, in fact it is not intended to resolve contention. In OBS, when burst is not programmed on other output port through routing deflection then it is simply deleted. To route data to the receiver, the routing deflection does not resolve all aspects that resulted loss of data; therefore, the performance of schemes deflection existence is not acceptable by the systems and so it closes with deletion any plan to resolving contention, backtrack if deflection fails (BDF), that is given as a second opportunity to burst in order to face the failure through deflection, the blocked bursts will return to the previous station, to find suitable alternative available paths.
The Novel Effective Hybrid Contention Resolution Scheme for Optical Burst Switched Network
the Optical Burst Switched (OBS) Networks is buffer less and thus contention among the bursts is unavoidable fact. Many Burst retransmission schemes have been proposed in the literature to deal with burst contention. Burst retransmission gives better throughput performance for higher layers. At high network load, the random retransmission mechanism often leads to unprecedented increase in network load. In many cases, retransmission of lost burst beyond allocated time offers no benefits. Also, the existing retransmission scheme fails to capture the effect of load variation in each retransmission attempt and cannot be adaptive to retransmission requirements for different traffic conditions. Therefore, we propose an Adaptive Hybrid Burst Retransmission and Wavelength Conversion Scheme. Which adaptively balance between the number of retransmission attempts and wavelength conversion in contention scenario. Thereby effectively manage the increase in the network load. The propose model is evaluated with various parameters like path blocking probability and burst loss probability to measure the associated benefits and its impact on the network performance. The simulated results of our scheme are compared with existing retransmission scheme. The results show that the proposed hybrid mechanism provides adaptive selection and thus perform better than the existing contention solving schemes.
Pre-Deflection Routing With Control Packet Signal Scheme In Optical Burst Switch Networks
2014
Optical Burst Switching (OBS) is a promising technology for the future generation Internet. Control architecture and Contention resolution are the main issues faced by the Optical Burst Switching networks. In this paper we are only taking care of the Contention problem and to overcome this issue we propose Pre-Deflection Routing with Control Packet Signal Scheme for Contention Resolution in Optical Burst Switch Networks. In this paper Pre-deflection routing approach has been proposed in which routing is carried out in two ways, Shortest Path First (SPF) and Least Hop First (LHF) Routing to forward the clusters and canoes respectively. Hereafter Burst Offset Time Control Algorithm has been proposed where a forward control packet (FCP) collects the congestion price and contention price along its paths. Thereafter a reverse-direction control packet (RCP) sent by destination node which delivers the information of FCP to the source node, and source node uses this information to revise it...
Adaptive Hybrid Deflection and Retransmission Routing for Optical Burst-Switched Networks
Burst contention is a well known challenging problem in Optical Burst Switching (OBS) networks. Deflection routing is used to resolve contention. Burst retransmission is used to reduce the Burst Loss Ratio (BLR) by retransmitting dropped bursts. Previous works show that combining deflection and retransmission outperforms both pure deflection and pure retransmission approaches. This paper proposes a new Adaptive Hybrid Deflection and Retransmission (AHDR) approach that dynamically combines deflection and retransmission approaches based on network conditions such as BLR and link utilization. Network Simulator 2 (ns-2) is used to simulate the proposed approach on different network topologies. Simulation results show that the proposed approach outperforms static approaches in terms of BLR and goodput.
Deflection Routing Strategies in Optical Burst-Switched Networks
Optical Burst Switching (OBS) is a very promising technology for the next generation optical Internet as it offers a more efficient bandwidth utilization and a great potential for an efficient integration of IP and WDM technologies. However, several critical issues still need to be solved such as contention resolution without optical buffering. Contention arises when two or more bursts compete for the same output fiber on the same wavelength at the same time. It is a key determinant of packet-loss performance with a significant impact on network performance. In this paper, we propose and evaluate three new deflection routing strategies which aim at resolving contention. They lead to significant better network performance when compared with the most recent contention resolution schemes proposed in the literature. One of the drawbacks of the deflection routing mechanisms discussed in the literature is their lack of ability for computing alternative paths based on clear design constraint. The proposed deflection strategies are based on different alternative path computing methods: i) Shortest Path(SP), ii) Latest Available Unused Channel with Void Filling (LAUC-VF) and iii) Least Used Wavelength (LUW). Simulation under different traffic assumptions have been conducted on the EONET network to analyze and compare the three new deflection routing strategies.
A new contention avoidance scheme in optical burst switch network
IEEE International Conference on Networks, 2008
Optical burst switching (OBS) is developed as an alternative switching technology, which combines advantages of both Optical circuit switching (OCS) and Optical packet switching (OPS) and avoids the disadvantages. In OBS control packet called control burst is separated from data packet called data burst. A control burst is sent in advance, which configures the switches in the path for the
Performance analysis of optical burst switched node with deflection routing
2003
As the optical network evolves from static long haul connection provider to an adaptive and "smart" backbone solution, Optical Burst Switching (OBS) becomes an attractive scheme for its flexibility and efficiency. However, how to reduce data loss is a crucial issue in such an asynchronous and one way reservation system. In this paper, we study one contention resolution strategy in OBS networks: deflection routing. We extend an existing work to provide approximate and accurate models for the data loss analysis of single OBS node with and without wavelength conversion capability. The accuracy of our models are evaluated by simulation results.
Indonesian Journal of Electrical Engineering and Computer Science, 2022
Optical burst switching (OBS) is a transporting network for the optical internet in the years ahead vision. As OBS depends on statistical multiplexing, the effect of contention resolution is the main issue to achieve a low probability losing of burst. Basically, there are different ways to resolve contentions in the OBS networks like wavelength conversion, deflection routing, burst segmentation and optical buffering using fiber delay lines. Burst segmentation and deflection routing as well as fiber delay lines technologies, are discussed among the various accessible conflict resolution techniques in this study. However, the main aim of this study is to demonstrate that, the performance of fiber delay line (FDL) is better than other techniques to resolve contention by comparing the performance of these different schemes based on burst losing probabilities and the data handling capability. To evaluate the performance, appropriate mathematical formulae were used. Under the MATLAB environment, the performance was measured based on the probability of burst loss versus incoming traffic (load). The outcomes suggest that deflection routing outperforms fiber delay lines and burst segmentation in the OBS network in terms of resolve the contention.
2013
A promising option to raising busty interchange in system communication could be Optical Burst Switched (OBS) networks among scalable and support routing effective. The routing schemes with disputation resolution got much interest, because the OBS network is buffer less in character. Because the deflection steering can use limited optical buffering or actually no buffering thus the choice or deflection routing techniques can be critical. Within this paper we investigate the affirmation of the current literature on alternate (deflection) routing strategies accessible for OBS networks. GJCST-E Classification : C.2.2 Deflection Routing Strategies for Optical Burst Switching Networks Contemporary Affirmation of the Recent Literature Strictly as per the compliance and regulations of: Deflection Routing Strategies for Optical Burst Switching Networks: Contemporary Affirmation of the Recent Literature Venkata Rao Tavanam , Venkateswarlu. D. S σ & Karuna Sagar Dasari ρ Abstract A promising ...
A multi-layer approach for load balancing in optical burst switching networks
Optik - International Journal for Light and Electron Optics, 2013
In optical burst switching (OBS) networks, contention is reckoned as a major issue since it not only reduces the efficiency and utilization of resources, but can also trigger TCP congestion control strategies. Contention can be reduced by avoiding multi layer network congestion through load balancing. This paper presents the results of a study of Split-TCP based deflection routing for load balancing to reduce network congestion and hence contention in OBS networks. Initially, in transport layer N:1:N Split TCP approach is enforced over the ingress node. The data bursts upon reaching the OBS routing and burst management layer are segmented and probed for contention. If contention occurs, then the flow is prioritized and deflected to a random free output link. The adaptability of the network to time varying loads and the overall efficacy of this technique in limiting burst losses are assessed through this study. We compare the efficiency of the above scheme with similar implementation of Sack TCP in OBS layer. By simulation results, we show that the Split TCP deflection routing approach offers efficient load balancing, with more than 50% reduction in end to end delay and a quadruple increase in throughput when compared to Sack deflection routing.