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In wireless sensor networks (WSNs), a significant amount of packets are lost when transmitted over wireless links, leading to unnecessary energy expenditure. This lossy property of a link can be described by the packet reception ratio (PRR) over it. In the literature, it was shown that the PRR of a link is a non-decreasing function of its signal to interference-plus-noise ratio (SINR), which indicates...
A planar graph is one that can be drawn (say on a piece of paper) without any crossing links. In this paper we show, using a new data set, that data-network graphs show a surprisingly high likelihood of being planar. The data set — the Internet Topology Zoo — is a store of network data created from the information that network operators make public. As such, it includes meta-data that we could never...
We propose a new reliable transport scheme for Delay Tolerant Networks (DTNs) based on the use of acknowledgments (ACKs) as well as coding. We, specifically, develop a fluid-limit model to derive expressions for the delay performance of the proposed reliable transport scheme and derive the optimal setting of the parameters which minimize the file transfer time. Our results yield optimal values for...
Online video services account for a major part of broadband traffic with streaming videos being one of the most popular video services. We focus on the user perceived quality of YouTube videos as it can serve as a general index for customer satisfaction. Our tool, Pytomo [1], is a tomography tool that is designed to measure the playback quality of videos as if they are being viewed by a user. We model...
Peer-to-peer (P2P) systems are responsible for a large fraction of inter-ISP transit traffic in the Internet. Hence, many Internet service providers (ISPs) have deployed P2P caches to decrease their P2P related transit traffic. In our work we consider the problem of allocating the limited upload capacity of a P2P cache between a set of overlay swarms. The goal of cache capacity allocation is to increase...
Number portability provides users the capability to keep their telephone numbers as they moves to another provider. Number portability technology involves complicated architecture between different providers. From a routing perspective, and in order to simplify the model, we consider that the traversal of a call to a ported number may involve three different networks: the Originating Network, the...
Replication games are a model of the problem of content placement in computer and communication systems, when the participating nodes make their decisions such as to maximize their individual utilities. In this paper we consider replication games played over arbitrary social graphs; the social graph models limited interaction between the players due to, e.g., the network topology. We show that in...
Modern cellular networks may be deployed using multiple radio-access-network technologies with multi-mode mobile terminals capable of selecting among different technologies. Such a network typically forms an overlay-underlay architecture where the underlay uses an older technology (e.g., 3G) while the overlay uses a newer technology (e.g., 4G). It has been observed that excessive signaling message...
This poster paper describes testbed for collection of BCNET Border Gateway Protocol (BGP) traffic. The BGP traffic was collected using special purpose hardware and software. Preliminary data collection was illustrated using the Wireshark and Walrus graph visualization tools.
We explore the spatio-temporal congestion dynamics of wireless networks with backlog-based random-access mechanisms. While relatively simple and inherently distributed in nature, suitably designed backlog-based access schemes provide the striking capability to match the optimal throughput performance of centralized scheduling algorithms in a wide range of scenarios. In the present paper, we show that...
Content-centric networking proposals, as Parc's CCN, have recently emerged to define new network architectures where content, and not its location, becomes the core of the communication model. These new paradigms push data storage and delivery at network layer and are designed to better deal with current Internet usage, mainly centered around content dissemination and retrieval. In this paper, we...
Due to the variation of radio condition in LTE the obtainable bitrate for active users will vary. The two most important factors for the radio conditions are fading and pathloss. By including both fast fading and shadowing and attenuation due to distance we have developed analytical models to investigate obtainable bitrates for the basic resource unit in LTE. In addition we estimate the total cell...
In this paper, we investigate the effectiveness of the conventional heuristic routing method that improves the computation time of MILP for the large-scale IP-optical network design and we propose a more effective heuristic routing method. The results of calculation experiments showed that proposed heuristic routing method is very excellent not only in the reduction of the computation time but also...
Recent studies have shown that energy harvesting wireless sensor networks have the potential to provide perpetual network operations by capturing renewable energy from the external environment. However, the spatial-temporal profiles of such ambient energy sources typically exhibit great variations, and can only provide intermittent recharging opportunities to support low-rate data services. In order...
It has previously been shown that the combined use of fair queuing and admission control would allow the Internet to provide satisfactory quality of service for both streaming and elastic flows without explicitly identifying traffic classes. In this paper we discuss the design of the required measurement based admission control (MBAC) scheme. The context is different to that of previous work on MBAC...
Longest-prefix matching (LPM) is a key processing function of Internet routers. This is an important step in determining which outbound port to use for a given destination address. The time required to look up the outbound port must be less than the minimum inter-arrival time between packets on a given input port. Lookup times can be reduced by caching address prefixes from previous lookups. However...
The energy consumed by communication networks can be reduced in several ways. A promising technique consists in concentrating the workload of an infrastructure on a reduced set of devices, while switching off the others. This technique, called "resource consolidation", is particularly appealing when routing data traffic over a lightly loaded network. However, deciding on the set of routers...
The Re-ECN protocol is a recently proposed congestion notification scheme for IP networks. Building upon Explicit Congestion Notification (ECN), which marks packets instead of dropping them during congestion, Re-ECN requires the end users to re-insert the marking information back to the network as a feedback to allow the network react more effectively on resource management. In this work, we first...
Beside of social media networks, crowdsourcing is one of the emerging new applications and business models in the Future Internet, which can dramatically change the future of work and work organization in the on-line world. The crowdsourcing technology can be viewed as "Human Cloud" technique, in contrast to "Machine Cloud Computing". Using a crowd with a large number of internationally...
Wavelength Division Multiplexing (WDM) optical networks offer a large amount of bandwidth using multiple, but independent wavelength channels (or lightpaths), each operating at several Gb/s. Since the traffic between users is usually only a fraction of the capacity offered by a wavelength, several independent traffic streams can be groomed together. In addition, in order to reverse the effect of noise...
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