The Internet is entering an era of cloud computing to provide more cost effective, eco-friendly and reliable services to consumer and business users. As a consequence, the nature of the Internet traffic has been fundamentally transformed from a pure packet-based pattern to today’s predominantly flow-based pattern. Cloud computing has also brought about an unprecedented growth in the Internet traffic. In this paper, a hybrid optical switch architecture is presented to deal with the flow-based Internet traffic, aiming to offer flexible and intelligent bandwidth on demand to improve fiber capacity utilization. The hybrid optical switch is capable of integrating IP into optical networks for cloud-based traffic with predictable performance, for which the delay performance of the electronic module in the hybrid optical switch architecture is evaluated through simulation.
The Internet is entering an era of cloud computing to provide more cost effective, eco-friendly and reliable services to
consumer and business users and the nature of the Internet traffic will undertake a fundamental transformation.
Consequently, the current Internet will no longer suffice for serving cloud traffic in metro areas. This work proposes an
infrastructure with a unified control plane that integrates simple packet aggregation technology with optical express
through the interoperation between IP routers and electrical traffic controllers in optical metro networks. The proposed
infrastructure provides flexible, intelligent, and eco-friendly bandwidth on demand for cloud computing in metro areas.
In emerging agile all-optical networks, where time division multiplexing (TDM) in the optical domain is implemented on top of wavelength-division multiplexing (WDM) to improve the network utilization and to support dynamic bandwidth demands, a control mechanism is required to handle the setup and tear down of fast flexible all-optical connections. In this paper, we propose two control protocols for WDM-TDM all-optical ring networks based on whether or not global network information is available. For the global information based protocol, we choose a periodic state-updating mechanism to confine the control message overhead within a reasonable range. For the local information based protocol, we select a backward reservation scheme for dynamic routing, wavelength and timeslot assignment (DRWTA) algorithms to prevent bandwidth overbooking. By conducting extensive numerical simulations, we investigate the impact of imprecise information on the blocking probability of the DRWTA algorithms for the two protocols. Our simulation results show that the local information based protocol outperforms the global information based protocol for metro all-optical networks where propagation delay is small compared to the service time of requests.
TCP congestion control mechanism has been widely investigated and deployed on Internet in preventing congestion collapse. We would like to employ modern control theory to specify quantitatively the control performance of the TCP communication system. In this paper, we make use of a commonly used performance index called the Integral of the Square of the Error (ISE), which is a quantitative measure to gauge the performance of a control system. By applying the ISE performance index into the Proportional-plus-Integral controller based on Pole Placement (PI_PP controller) for active queue management (AQM) in IP routers, we can further tune the parameters for the controller to achieve an optimum control minimizing control errors. We have analyzed the dynamic model of the TCP congestion control under this ISE, and used OPNET simulation tool to verify the derived optimized parameters of the controllers.
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