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Segment Routing (SR) can be used as a traffic engineering strategy to counteract increasing loads on networks like Internet Service Provider (ISP) backbones. Many SR approaches, however, optimize traffic flows that were measured in the past. This paper introduces a new tunnel training architecture. It aims to show that the results of these strategies can still be beneficial for routing new traffic...
The paper deals with the contact center modeling with emphasis on the optimal number of agents. The contact center belongs to the queueing systems and its mathematical model can be described by various important parameters. The Erlang C formula tends to be suitable tool for the modeling of QoS parameters of contact centers. In our paper, we propose two parameters: downtime and administrative task...
Space division multiplexing (SDM) seems to be a promising solution with the scaling potential to overcome the possible capacity crunch problem in optical backbone networks. The main goal of this paper is to provide a detailed analysis of three SDM scenarios, namely, SDM-Fixed, SDM-Single, and SDM-Flexible in terms of the spectrum usage and the wastage of spectral resources due to guardbands and resource...
As many applications today migrate to distributed computing and cloud platforms, their user experience depends heavily on network performance. Software Defined Networking (SDN) makes it possible to obtain a global view of the network, introducing the new paradigm of developing adaptive applications with network views. A naive approach of realizing the paradigm, such as distributing the whole network...
Network Functions Virtualization (NFV) aims to support service providers to deploy various services in a more agile and cost-effective way. However, the softwarization and cloudification of network functions can result in severe congestion and low network performance. In this paper, we propose a solution to address this issue. We analyze and solve the online load balancing problem using multipath...
The article aimed at offering new ways of routing in networks with the DTN architecture, which allows using the most optimal routes for determining the routes depending on various conditions. To achieve these goals, it is necessary to analyze the available developments in this field with the subsequent identification of advantages and disadvantages. An attempt to realize advantages with a minimum...
Geographic Routing is suitable for the limited resource in wireless sensor networks and Ricci flow-based methods have been employed. Unfortunately, iterative process through previous methods may spend abundant energy in order to discovery route, which obviously effect their advantageous of this sort of schemes. In this paper, we focus on avoiding unnecessary iterations and propose an algorithm through...
The performance of wireless multi-hop mesh networks is negatively affected by interference between neighboring links which use the same channel. Even if no interflow interference exists, intra-flow interference still degrades network performance to a high degree. To overcome this problem this paper presents a routing protocol for wireless multi-hop networks with multiple radio interfaces, which minimizes...
Software Defined Networking (SDN) provides efficient network control and management by introducing a logically centralized control plane. However, outsourcing of the control plane intelligence to an SDN controller requires reliable switch-to-controller connection.
Memetic algorithms (MAs), which have materialized as a fusion of population based global search and individual lifetime learning (i.e., local search) in the literature, have been widely used in real world applications to solve complex optimization problems. The balance of global and local search in MA plays a key role in defining the performance of MA in problem solving. The probabilistic memetic...
This paper presents a new method for selection between replicated servers distributed over a wide area, allowing application and network providers to trade-off costs with quality-of-service for their users. First, we create a novel utility framework that factors in quality of service metrics. Then we design a polynomial optimization algorithm to allocate user service requests to servers based on the...
Low power and lossy networks (LLNs) consist of devices having limited battery power, less memory, reduced processing capability. RPL (Routing Protocol for low power and Lossy networks), is an approved Internet Engineering Task Force (IETF) standard routing protocol for IPv6-based LLNs. RPL uses a proactive routing approach and the sink or controller node within the network creates a Directed Acyclic...
In this paper, we focus on the important problem of locating data centers (DCs) in elastic optical network (EON). We propose to use both topology-based (that follow directly from the network graph structure) and demographic-economical (characteristics of the cities that correspond to network nodes) data to define DC location policies. In particular, we define 7 different DC location polices, which...
We present a nodes' remaining energy-aware objective function in order to equalize the energy distribution among the nodes with the ultimate goal of extending the lifetime of the network. Routing Protocol for Low Power and Lossy Networks (RPL) is the routing standard for the Internet of Things. It chooses the optimal routes from a source to a destination node based on specific metrics. Since the nodes...
This paper presents a queueing network approach to the analysis and control of mobility-on-demand (MoD) systems for urban personal transportation. A MoD system consists of a fleet of vehicles providing one-way car sharing service and a team of drivers to rebalance such vehicles. The drivers then rebalance themselves by driving select customers similar to a taxi service. We model the MoD system as...
The impact of traffic asymmetry on performance of Elastic Optical Networks (EONs) is studied. Results of experiments are presented to show how both symmetric and asymmetric lightpath provisioning scenarios influence spectrum usage and network CAPEX cost.
Due to their intrinsic characteristics, Wireless Sensor Networks (WSN) are prone to failure, mainly because of their energy limitations. Considering this, the use of self-healing mechanisms becomes necessary in order to create a more fault-tolerant and robust WSN. With this problem at hand, we have proposed and developed DACA, a Disjoint path And Clustering Algorithm that increases the network lifetime...
We present a framework for the route selection and throughput optimization of the data transmission routes for the mobile sensor networks in presence of the multipath Rayleigh fading. The framework is constituted of two main phases i.e. Communication Aware Optimization (CAO) and Position Aware Optimization (PAO). The CAO utilizes a communication quality oriented routing metric into the route selection...
In this paper, we focus on a survivable elastic optical network (EON) that supports both unicast and anycast traffic demands. The network implements a dedicated path protection scheme (DPP), in which backup lightpaths are assigned to traffic demands so that to protect against single link failures. In a normal network state, each anycast demand is served by a specific data center (DC). However, we...
Routing Protocol for Low-Power and Lossy Networks (RPL) is the Internet Engineering Task Force (IETF) standard for IPv6 routing in Low-power and Lossy Networks (LLNs). By using the Objective Function (OF) and a collection of routing metrics, it can build a Destination Oriented Directed Acyclic Graph (DODAG). There are two kinds of OFs specified by the IETF, Objective Function Zero (OF0) and Minimum...
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