Dynamic hybrid grooming based on power efficiency in green IP over WDM networks |
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Authors: | Weigang?Hou Email author" target="_blank">Lei?GuoEmail author Xiaoxue?Gong Yejun?Liu |
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Affiliation: | (1) Department of Information Management, Shih-Hsin University, Taipei, Taiwan;(2) Optical Communications & Networking Technologies Department, Information & Communications Research Labs, ITRI, Hsinchu, Taiwan |
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Abstract: | Due to the rapid growth of various applications, the network devices scale and complexity are significantly increased. Meanwhile,
to deal with the burst IP traffic, the network devices need to provide continuous services, which will result in the excessive
power consumption. Meanwhile, with the development of IP network and intelligent optical switch network, the backbone network
tends to be an IP over wavelength-division-multiplexing (WDM) network. Therefore, it has attracted wide interests in both
academic and industrial communities to build power-efficient (i.e., green) IP over WDM network, where we can switch several
IP-level requests as one unit in the WDM optical layer. This method is called hybrid grooming and it requires less component
power than that of electronic IP routers in the IP layer. Under this hybrid approach, the traffic grooming multiplexes many
IP-level requests into a high-capacity lightpath; meanwhile the reduction in power consumed by optical-electrical-optical
conversions is achieved through optical bypass. However, the power consumed by components used to establish lightpaths should
also be considered. One network with the higher power efficiency not only saves more power followed by hybrid grooming but
also requires the lower power consumption of establishing lightpaths. In this paper, to improve the power efficiency of dynamic
IP over WDM network, we design two kinds of Wavelength Integrated Auxiliary Graphs (WIAGs), each of which contains one Virtual
Topology Layer and multiple Wavelength-Plane Layers. Based on WIAGs, we propose two heuristic algorithms named single-hop
grooming with considering power efficiency and multi-hop grooming with considering power efficiency (MGPE) since grooming
is NP-hard. Simulation results demonstrate that MGPE obtains the higher power efficiency, although it has the slightly higher
time complexity; the power efficiency mainly depends on the kind of grooming strategy (single- or multi-hop) we use while
the increasing number of available transceivers in each node cannot improve the power efficiency, although it can make blocking
probability decrease. |
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