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In this paper, we address the problem of routing, space and spectrum assignment (RSSA) in survivable flex-grid networks that implement spatial division multiplexing (SDM). In our consideration, we focus on two switching policies for the SDM (namely, independent and joint) while the network survivability is provided by dedicated path protection (DPP). We formulate the problem (RSSA-DPP) as an integer...
This paper evaluates the performances of elastic optical networks (EONs) in terms of request blocking probability with and without incorporation of spectrum conversions at intermediate switches. In EONs, dynamically setting up and tearing down of lightpath connections generate spectrum fragmentation problems. The spectrum fragmentation problem occurs when the available spectrum slots are isolated...
Space division multiplexing (SDM) is a promising solution with the scaling potential to overcome the possible capacity crunch problem in optical backbone networks. The key idea behind SDM is to exploit the spatial dimension to provide a significant increase in the transmission system capacity. In SDM, optical signals are transmitted in parallel through spatial resources (fibers, cores or modes), thus...
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...
Optical wavelength-routed networks enable parallel transmission of massive datasets on non-overlapping wavelength channels. However, as the sizes of scientific workflows increase, the simple availability of multi-wavelength resources will fall short of supporting application needs. Rather, these resources must be allocated intelligently, efficiently, and flexibly to bear the burden of high-volume...
In an OpenFlow-based network, the resources arepartitioned in slices. For isolation reasons, each slice has its ownforwarding plane and therefore its own flow table. The searchmemory is so pre-partitioned between the slices. This pre-setmechanism for memory slicing would easily crash the controllerbecause of only one of the slices memory overload. To solvethis problem, we propose, in this paper, a...
Routing and spectrum allocation (RSA) is known as a key challenge in elastic optical networks (EON). Specifically, RSA process is categorized as (i) without adjusting modulation format (simply referred to as RSA), and (ii) with adjusting modulation format (referred as routing, modulation level and spectrum allocation (RMSA)). This paper focuses on the former, that is RSA problem which is basically...
This paper aims to design a Hadoop system and evaluates the performance of a task allocation scheme. The task allocation scheme splits each job into tasks using an appropriate splitting ratio, and assigns tasks to slave servers based on server processing performance and network resource availability. We experimentally evaluate the performance of the scale out of the task allocation scheme with five...
Critical data transmissions are often scheduled hours or days in advance of the actual acquirement of network resources, allowing for efficient allocation and scheduling among a set of competing or temporally overlapping lightpath demands. Many periodic applications may not only desire service at some future time, but may further require repeatable and predictable scheduling services. Typically, such...
This paper proposes a novel Routing and Spectrum Assignment (RSA) method in Pbit/s optical switching node: Multipath and Optimal Spectrum Continuity based (MOSC) method for de-fragmentation. This method mitigates spectrum fragmentation occurs in Pbit/s optical switching node of flexible bandwidth optical networks due to dynamic allocation of spectrum resources for new connections. Simulation results...
We present a novel planning methodology addressing both fixed ITU as well as flexible grid networks. The proposed optimization in conjunction with node clustering is shown to improve energy efficiency and cost of the BT network by about 15%.
Today, large amounts of data, growing from terabytes to petabytes, need to be transferred across the globe in a timely manner. To accommodate this efficiently, network operators are augmenting their networks to 100 Gbps links and beyond. The spectrum-sliced elastic optical path network (SLICE) architecture enables accommodation of variable-rate data traffic in a highly spectrum-efficient manner. The...
As systems capabilities expand, increasingly demanding applications are developed resulting in the need to further increase system capabilities. Concurrent with the emergence of new applications, link technologies also have progressed and new technologies have been successfully integrated into todays networks. The main traffic types of todays applications and legacy services are carried using one...
Benes networks are constructed with simple switch modules and have many advantages, including small latency and requiring only an almost linear number of switch modules. As circuit-switches, Benes networks are rearrangeably non-blocking, which implies that they are full-throughput as packet switches, with suitable routing. Routing in Benes networks can be done by time-sharing permutations. However,...
We propose a hierarchical multi-granular switch architecture in FWDM networks, and investigate the routing, spectrum allocation, and waveband assignment problem. Hierarchical switching can improve cost and energy efficiencies while marginally sacrificing spectral efficiency.
We investigate the routing, wavelength assignment, and spectrum allocation problem in WC-FWDM networks for the first time. The benefits of full, limited, sparse, and limited range wavelength conversion capabilities are evaluated in WC-FWDM networks.
In this paper, we introduce an electronic traffic grooming (E-Grooming) technique, and propose a novel bit rate and protocol independent optical-layer traffic grooming (O-Grooming) technique for OFDM-based flexible grid WDM networks. We introduce a novel routing, wavelength assignment, subcarrier assignment, and spectrum allocation (RWSSA) problem for the first time. An effective polynomial-time heuristic...
Henan agricultural informatization center, which is a part of Henan agricultural university campus network and contains nearly 800 host machines, had realized complete coverage of IPv4 network. Considering the long-term transition process from IPv4 to IPv6 and reserving current IPv4 application, the CNGI Customer Premise Network (CPN) in the center was constructed based on IPv6 / IPv4 double protocol...
We propose and experimentally evaluate a distributed spectrum assignment approach for GMPLS-controlled elastic networks based on collecting the frequency slot availability information during the signaling phase and performing efficient spectrum allocation at the destination node.
Advances in device technology and dense wavelength division multiplexing have enabled modern optical backbones to provide high data rate services in a cost-effective manner. At the same time, applications are emerging with the potential to leverage these capabilities for short time spans: load migration for Internet clouds, integrated computational grids, and remote surgery. Until such applications...
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