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The Blocking Windows Algorithm (BWA) with the fixed-size windows was introduced by Lea in [1] and was used in nonblocking multicast banyan type switching networks. Later, Danilewicz and Kabacin´ski extended BWA to the variable window sizes variant in [2]. Some authors used this concept for different architectures of nonblocking multicast switching networks (Danilewicz, Hwang) [3], [4]. In this paper,...
An optical packet and circuit integrated network (OPCInet) provides both high-speed, inexpensive services and deterministic-delay, low-data-loss services according to the users' usage scenarios, from the viewpoint of end users. As for network service providers, OPCInet provides them with large switching capacity of low energy consumption, high flexibility, and efficient resource utilization in the...
A critical performance metric of multi-hop wireless networks is the end-to-end throughput of a multi-hop wireless path. When the packets of a traffic flow originating from a source node are relayed by intermediate nodes (relay nodes), competition between the nodes on the multi-hop routing path incurs transmission delays from the carrier sensing mechanism, as well as packet drops and retransmissions...
Redundancy in Ethernet networks has always been an unresolved problem, with associated solutions continuously failing in providing proper support for available network resources management, as well as in the fault tolerance of such networks. However, with the introduction of novel configurable and dynamic mechanisms, such as Software Defined Networking (SDN) and their programmable nature, a unique...
Most of the network operators are looking into how to upgrade their existing network infrastructures in a cost-effective manner. As packet optical convergence has been a major trend in optical networking, network operators are interested in packet optical convergence technologies. POTN (Packet Optical Transport Network) is a recently emerging technology that integrates optical, circuit and packet...
The tight connection between advanced mobile techniques and optical networking has already been made by emerging cloud radio access network architectures, wherein fiber-optic links to/from remote cell sites have been identified as the leading high-speed, low-latency connectivity solution. By taking such fiber-optic mobile fronthaul networks as the reference case, this paper will consider their scaling...
Least recently used (LRU) is the most commonly applied strategy to update the content of caches in computing and database systems as well as for web caching. Although some case studies have shown that LRU hit rates can be low when compared to web caching strategies being aware of complete statistics of past requests, proposed alternatives seem too complex to cope with constant update effort of LRU...
Recent reports of Internet-scale traffic redirection based on BGP route hijacking, for perpetration of man-in-the-middle (at distance) attacks, have put major institutions and network service providers in alert. However, corporate customers have to content with a helpless bystander and victim roles due to the lack of tools to detect and counter-act Internet-scale traffic redirection. An world-wide...
This paper describes the path for future implementations of flexible optical transmission. The baseline discussion is divided into the transponder technical aspects and the network subsystem elements. Regarding flexible transponder, three degrees of freedom such as modulation format, symbol rate and number of channels are exploited in order to obtain rate adaptive transmitters and receivers. In addition,...
The paper discusses business impact analysis in the context of resilient networks. The emphasis is put on risk evaluation using Value-at-Risk (VaR) and Conditional VaR measures. The concerns known for VaR are shown, especially the theoretical lack of subadditivity. The study shows that in practice the disadvantages do not appear in resilient networks design, and there is no need to apply the more...
This paper proposes a dynamic traffic management (DTM) mechanism which addresses the problem of cost-optimal distribution of inevitable overlay inter-domain traffic on multiple links. The paper extends the DTM mechanism to the 95th percentile charging rule enabling dynamic overlay traffic management and adaptation to constantly changing traffic patterns to meet cost optimization goals. The mechanism...
Locality-aware policies for content distribution attempt to redirect content requests to nearby sources in order to optimize bandwidth utilization and reduce operating costs for Internet Service Providers. For this purpose, an oracle service is required to track content availability at each location and dynamically redirect requests to an optimal source. In this paper we propose an OpenFlow-based...
The proliferation of Distributed Denial of Service (DDoS) attacks is a constant threat to business and individuals. Existing systems proved to be inefficient when deploying counter-measures at the target of the attacks. In fact, efficient counteractions should be applied at the networks that contain the sources of the attack. However, the detection of such type of attacks at the source is extremely...
The characteristics of Internet traffic are becoming more and more complex due to the large and growing diversity of applications, the drastic differences in user behaviors and the mobility of users and devices, the complexity of traffic generation and control mechanisms, and the increasing diversity of link types and qualities. In such an environment, it is inevitable that network management tasks...
Optical Burst Switching (OBS) is an architecture proposed to support broadband traffic over WDM networks. In OBS packets with the same destination are aggregated in bursts and transported through a light path established by a control message sent ahead of the burst. OBS suffers from a well known fairness problem, in that bursts with longer paths have higher blocking probabilities. In this paper, we...
Economic sustainability of the ever-increasing traffic requirements is built on the cost reduction of IP-over-WDM backbone networks. These networks are composed of a set of IP routers connected via all-optical circuits (or lightpaths), bypassing intermediate nodes, thanks to reconfigurable optical equipment. Today, traffic survivability is ensured by over-dimensioning the IP layer and using some IP/MPLS...
In this paper, we evaluate the performance perceived by end-users with very high access rates, connected to a common backhaul link that aggregates the traffic of multiple access areas. We model, at flow level, the way a finite population of users with heterogeneous access rates and traffic demands shares the capacity of this common backhaul link. We then evaluate several practically interesting use...
With diversification of content distribution systems, multi-view video distribution services, particularly in real-time services, will become popular in the future. To distribute many contents to many users, P2P live streaming systems are expected due to its high scalability. Because of this characteristic, P2P live streaming systems are also suitable for multi-view video distribution services. However,...
In order to expand the transmission capacity of optical backbone networks, many innovative technologies such as Elastic Optical Network (EON) and Space Division Multiplexing (SDM) have intensively researched. These advanced network technologies require new optical node structures which can fully utilize the additional channels of the next-generation networks. Architecture on Demand (AoD) concept enables...
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