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With the growth of cloud computing and other high-bitrate disaster recovery center (DRC) support service, DRC networks play an important role in the future networks. But the nature or man-made disaster is the main threaten of survivability. In this paper, we focus on the protection of DRC node based on contentconnectivity against disaster in disaster recovery center networks. An integer linear programming...
In this paper, we propose a novel re-restoration mechanism based on fuzzy fault set under multi-faults in optical transport networks. This new scheme inherits from our already proposed FFS (fuzzy fault set) based restoration mechanism which is a reasonable trade-off between the recovery success rate and the remaining network risk resources. We mainly consider the link faults in the simulation because...
To address the challenge of the node-size (i.e., number of ports in the switching fabric) increase faced by the wavelength routed networks (WRNs), waveband switching (WBS) is introduced to group multiple wavelengths together as a band or fiber and switch them using a single port whenever possible. In WBS networks with dynamic traffic, one important goal is to minimize the traffic blocking probability,...
To handle the challenge of increasing node size in wavelength routing networks (WRNs), waveband switching (WBS) is introduced to group multiple wavelengths together as a band or fiber and switch them using a single port whenever possible. Literature studies with the off-line traffic confirm that WBS can effectively reduce the port count and cost as well as control complexity. In the cases with online...
This work proposes an adaptive routing scheme based on ant optimization techniques and novel graph-based waveband assignment algorithm to accommodate and group online lightpath requests while minimizing the blocking and resources usages in WDM networks.
Waveband switching (WBS) has recently attracted attention from a wide range of industry and academia groups for its practical and hierarchial concepts in handling massive lightpaths with reduced control complexity and nodal size. Previous studies demonstrate that non-uniform waveband switching, in which wavebands contain various number of wavelengths, can provide more flexibility for wavelength grouping...
In the wavelength routing networks (WRNs), one of the major challenges is the dramatic increase of node size and complexity. As an alternative solution, waveband switching (WBS) is introduced to group multiple wavelengths together as a band or fiber and switch them using a single port whenever possible. The WBS efficiency is defined as the ratio between the ports required under the WBS networks and...
We derive conditions under which a d-ary multilog network is f-cast strictly nonblocking under the general crosstalk constraint that no active route can share more than c switching elements with other active routes. The problem setting is very general and thus challenging in many ways: (1) f-cast covers both unicast (f = 1) and multicast/broadcast (f = N), (2) d-ary networks are much more general...
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