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Bloom filters have been employed in various fields because of its simple and effective structure in identifying the membership of an input. Since a Bloom filter can produce false positives, the positive results of a Bloom filter should be identified whether the positives are true or not by accessing the original database. A complement Bloom filter (C-BF) was introduced to identify the true positiveness...
Spectrum-sliced elastic optical path networks (SLICE) enable flexible bandwidth provisioning, which allows efficient resource utilization and support to heterogeneous bandwidth demands. This makes SLICE a very promising networking architecture. In SLICE, finding a route and a slice of the spectrum is an important design problem, which is known as the Routing and Spectrum Assignment (RSA) problem....
Physical topology design of optical networks is a NP-hard problem and is frequently accomplished by using heuristics and metaheuristics. Previous works investigated the suitability of a tunable version of the Gabriel method to represent optical networks regarding performance and cost. In this paper, we study the robustness of a heuristics based on Gabriel graphs deployed in three different backbone...
In dynamic-traffic Wavelength Division Multiplexing (WDM) networks, it is desirable to guarantee each optical circuit a minimum Optical Signal-to-Noise Ratio (OSNR) throughout the circuit's entire lifetime. The objective of this paper is to increase such guaranteed OSNR, which in turn enables bandwidth-efficient modulation formats to be applied to the circuit signals. The guaranteed OSNR is improved...
Network Function Virtualization (NFV) brings agility and flexibility delivering network services with cost efficiency to network operators. As an emerging technology, it also presents several challenges, among them, ensuring high performance for virtualized network functions, based on software implementation and running on standard IT servers, instead of custom hardware appliances. In this article,...
Accommodating sustained exponential traffic growth in optical networks requires scaling the spatial dimension using space-division multiplexing. Numerous uncoupled spatial channels may be realized by activating multiple parallel fibers or cores in multicore fibers. A multiplicity of uncoupled spatial channels will render the granularity provided by multiple wavelength channels less essential in enabling...
Deep programmability of dataplane pipelines is one of the tenets of the evolving Software Defined Networking (SDN) paradigm. Despite recent efforts on high performance programmable devices, achieving fully programmability (protocol independent) of heterogeneous dataplane implementations still pose numerous challenges. The P4 language is emerging as a strong candidate top-down approach to describe...
Elastic Optical Networks (EON) have been a constant focus of studies in recent years because they have characteristics that stand out in relation to current optical networks. Among these characteristics, it is possible to highlight the ability to transmit data with different bandwidths, adapted to the demand, which guarantees a high spectral efficiency. Different techniques and heuristics have been...
IPv6 Routing Protocol for Low-Power and Lossy Networks (RPL) is the only standardized routing protocol for Low Power and Lossy Networks. Therefore, RPL is the routing protocol chosen for most Internet of Things (IoT) applications. However, the RPL protocol has some open issues when the scenario includes mobile nodes. Since many IoT applications include mobility, this is an important problem to address...
We propose a highly scalable packet-switching architecture that suits for demanding Data Center Networks (DCNs). The design falls into the category of buffered multistage switches. It affiliates the three-stage Clos-network and the Networks-on-Chip (NoC) paradigm. We also suggest a congestion-aware routing algorithm that shares the traffic load among the switch's central modules via interleaved connecting...
We consider a software defined network (SDN) with a single controller communicating with all switches through a spanning tree rooted at the controller, or a controller tree. When a switch fails, its immediate downstream switch(es) will detect the failure. A downstream switch is protected if it has a neighbor whose path to the controller is not affected by this failure. By rerouting its traffic to...
This paper proposes a position-based routing scheme called Speed Up-Greedy Perimeter Stateless Routing Protocol for Wireless Sensor Networks (SU-GPSR). The speed up mode works together with greedy mode to provide a solution for data transmission in WSN. Unlike other variants of greedy perimeter stateless routing protocols, SU-GPSR not only embraces both still nodes and mobile nodes in one unified...
Optical networks are well suited to support massive data exchanges between data centers. Elephant traffic flows can be routed over provisioned and dedicated lightpaths (optical flows) while other (mice) flows, which are routed by electronic switches, are unaffected. In some solutions, Wavelength-Selective Switches (WSSs) are employed in the optical nodes to individually route the lightpath towards...
This paper proposes a decision model based on fuzzy logics to assign the route between source-destination nodes in elastic optical networks. The route is chosen dynamically based on the lowest cost criterion, which is calculated based on a weighted summation of three metrics, called availability of contiguous slots on the route, average availability of slots on the route and physical length of the...
This paper proposes a new method to compute alternate routes for multiple fault tolerance on Dynamic WDM Optical Networks. The method allows to obtain all the paths that replace the primary routes affected by one or several failures. Additional paths, called secondary routes, are used to keep each user connected to the network, including cases where multiple simultaneous link failures occur. The method...
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