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A resource allocation scheme consisting of joint assignment of routing, wavelength and time-slot is proposed to construct different channels in software-defined optical networks secured by quantum key distribution (QKD). Security level is considered by key-updating period.
Network service providers have to cope with the growing on-demand need from end-users as well as the diversity of usage. The softwerization and cloudification of the network components offer an interesting solution to achieve the agility necessary to dynamically match the requirement with the level of resource consumption. This materializes with the deployment of Network Functions Virtualization (NFV)...
The dramatic growth of Internet traffic brings challenges for optical network designers. There have been a number of advances recently in increasing fiber bandwidth and spectrum utilization efficiency through elastic optical networking (EON). In EON, a flexible and more fine-grained grid than conventional approaches is employed, and this allows allocated fiber bandwidth to better match traffic demands...
We investigate the impact of an unevenly distributed load among nodes of a distributed key-value store on response times. We find that response times of “get” operations quickly degrade in the presence of power law distributions of load and identify the point, at which the system needs to apply a mitigation approach. The migration technique, which we propose, overcomes the long response times of consistent...
One of the main challenges in Grid systems is designing an adaptive, scalable, and model-independent method for job scheduling to achieve a desirable degree of load balancing and system efficiency. Centralized job scheduling methods have some drawbacks, such as single point of failure and lack of scalability. Moreover, decentralized methods require a coordination mechanism with limited communications...
In this paper we propose an online, reward-based routing and spectrum assignment (RSA) method for multirate flex-grid optical networks. The method, denoted as MDP-RSA, is derived from a flex-grid optical link model based on the theory of Markov decision processes. Assuming that connections arrive randomly offering a reward to the system, the objective is to take the best decision on admission, routing...
The emergence of network virtualization solves the problem of ossification. At the same time, it provides endless possibilities for the innovations of the network architecture. As a result, it has attracted the attention of the next generation Internet architecture. Therefore this paper based on the architecture of For CES to explore the implementation of the data plane virtualization and provide...
With the growth of the Cloud Computing paradigm, a new challenge appears in the development of data centers: energy efficient load balancing in a dynamic and scalable environment with an undefined number of heterogeneous resources. In this context, considering that idle servers consume up to 60% of peak energy and the fact that usually the level of usage for a server is 20–30%, new load balancing...
Problem of energy saving in telecom industry can be partially solved by using IP-over-DWDM architecture. In the paper mathematical model for cross-layer optimal resource allocation in such networks according to power objective function is presented. In order to simplify process of numerical solving partitioning scheme is offered. Within the scheme subtasks of routing at IP level and wavelength assignment...
This paper focus on the routing, modulation level and spectrum allocation (RMLSA) problem in the next generation datacentre networks, which own the advantages of both Elastic Optical Networks (EON) and Software Defined Networking (SDN). We proposes an Integer Linear Programming (ILP) model for this problem. Simulation results show the ILP model achieves an outstanding load balancing performance.
The traditional routing protocols used in wireless mesh networks like AODV are not very efficient since the number of hops to a destination is mainly considered as the routing metric. This may lead to shorter paths; however, the throughput can decrease when traffic is routed through those paths. Various contributions have proposed different metrics or completely different routing algorithms. Nevertheless,...
Wireless Mesh Networks (WMNs) are new emerging multi-hop wireless networks that offer low-cost high-bandwidth community wireless services. Much work has been done so far in order to enhance the performance of these networks. In this paper, by using the optimization framework provided in [1], we study the impact of using some advanced wireless communication techniques on the performance improvement...
Though the decades of great success the Internet has experienced, it still confronts with many challenges to achieve QoS of various business types. A consensus has been reached that resource allocation presents a tremendously status in such a network bandwidth poor settings. In this paper, we bring the knapsack problem idea into reconfigurable network architecture (RNA), which is proposed with the...
Significant success of wireless networks in the last decade has changed the paradigms of communication networks design. In particular, the growing interest in wireless mesh networks (WMNs) is observed. WMNs offer an attractive alternative to conventional cable infrastructures, especially in urban areas, where the cost of new installations is almost prohibitive. Unfortunately, the performance of WMNs...
Delay-Tolerant Networks (DTNs) have become a promising solution for challenged communication environments. As a result, different routing schemes have been investigated that take into account the time-evolving nature of the network topology. Among them, Contact Graph Routing (CGR) has been proposed for environments with predictable connectivity. In order to evaluate routing decisions, DTN nodes need...
Cloud computing is an emerging field in computer science. Users are utilizing less of their own existing resources, while increasing usage of cloud resources. With the emergence of new technologies such as mobile devices, these devices are usually under-utilized, and can provide similar functionality to a cloud provided they are properly configured and managed. This paper proposes a Distributed Cloud...
The fast growing number of data centers in cloud raises high energy consumption problem. Thus there is a need for “Greening” in data center. ”Greening” means applying energy-saving techniques and designs in data center for power saving. Although cloud data centers nowadays are over-provisioned for high load, however, it is shown that the average data center load is only 30% [1]. There is lack of resource...
The optimal performance of the network can be achieved by simultaneous optimization of routing and resource allocation. We use a delayed dynamic model of queue length in each node to describe the data flows in the network. Unlike similar previous works in the literature we assume that delay exists in the queuing model and so we will have dynamic flow model for the routing of data packets across the...
This paper concerns the capacity allocation problem in multilevel virtual networks. The utility and cost functions are used to determine network performance in the economic terms. The considered problem is formulated as an optimization issue. This allocation problem (referred to as master problem) is decomposed into series of constrained concave maximization subproblems. The hierarchical procedure,...
Virtual Content Aware Networks (VCAN) constructed as overlays over IP network substrate is considered an efficient solution to incrementally introduce content awareness at network level. Planning, mapping on top of multiple domains IP network and optimizing these VCANs is still an open research issue. This paper is focused on intradomain planning and VCAN mapping, with QoS guarantees, thus continuing...
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