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- Li, Shuo, et al.
(author)
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Evaluation of Burst/Packet Loss Ratio in a Bufferless OBS/OPS Network With 1+X Path Protection
- 2016
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In: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 28:15, s. 1688-1691
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Journal article (peer-reviewed)abstract
- The importance of avoiding burst/packet loss because of equipment failures, especially for critical-mission services, gives rise to a method known as 1 + X path protection in optical networks. This method provides additional protection for premium (including emergency) services than the more common 1 + 1 path protection. In this letter, we consider a bufferless optical burst switched (OBS)/optical packet switched (OPS) network with two types of users: premium (that receive 1 + X protection service) and regular (that do not receive such a service). We propose an analytical method based on Erlang fixed-point approximation to evaluate the burst/packet loss of such OBS/OPS network. We demonstrate numerically the accuracy of the approximation, and also the effect and implications of the proportion of the premium traffic as X increases.
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| 3. |
- Li, Shuo, et al.
(author)
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Improving throughput and effective utilization in OBS networks
- 2015
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In: Optical Switching and Networkning Journal. - : Elsevier. - 1573-4277 .- 1872-9770. ; 18, s. 222-234
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Journal article (peer-reviewed)abstract
- This paper considers two important performance measures that have not received much attention in performance studies of optical burst switching (OBS) networks. The first is the so-called effective utilization which is the proportion of link capacity used by bursts that eventually reach their destinations. The second considers the throughput of individual source-destination pairs that may indicate unfairness and starving connections. Using these performance measures, we evaluate a new proposed contention resolution strategy called EBSL, which is a combination of the Emulated-OBS wavelength reservation scheme, with the two contention resolution strategies - Burst Segmentation and Least Remaining Hop-count First (LRHF). The results show that EBSL can prevent congestion collapse of throughput and effective utilization, and reduce the blocking probability under heavy load conditions. We then add deflection routing to EBSL to further increase the throughput under light and medium traffic load. Finally, we replace LRHF by a fairer version of LRHF in EBSL to provide insights into fairness efficiency and tradeoffs. Overall, we demonstrate that OBS can be enhanced to overcome its known traffic congestion related weaknesses of low throughput, ineffective utilization and unfairness.
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| 4. |
- Li, Shuo, et al.
(author)
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Performance Evaluation of a Bufferless OBS/OPS Network With 1+1 Path Protection
- 2015
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In: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 27:20, s. 2115-2118
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Journal article (peer-reviewed)abstract
- In optical burst/packet switched (OBS/OPS) networks, bursts/packets may be dropped because of equipment failures. A widely used mechanism to protect a connection from a single-trunk-failure event is 1 + 1 path protection. We consider a bufferless OBS/OPS network with two types of users: 1) premium (that receive 1 + 1 protection service) and 2) regular (that do not receive such a service). We propose a fast and accurate approximation to evaluate the performance of such OBS/OPS network. The accuracy and scalability of the approximation and the effect of the proportion of the premium users in the network are discussed.
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