2012 Proceedings IEEE INFOCOM Workshops

Cloud-computing systems are rapidly gaining momentum, providing flexible alternatives to many services. We study the Domain Name System (DNS) service, used to convert host names to IP addresses, which has historically been provided by a client's Internet Service Provider (ISP). With the advent of cloud-based DNS providers such as Google and OpenDNS, clients are increasingly using these DNS systems... View full abstract»

We study the Hulu online video service via active measurements. It is known that Hulu utilizes multiple CDNs to serve users' video requests. The focus of this study is on how Hulu selects CDNs and how each CDN allocates resources (i.e., servers) to serve user requests. Based on our analysis of measurement data, we find that Hulu frequently changes preferred CDNs for users. However, once a CDN is s... View full abstract»

The Diaspora network [1] is a recently launched decentralized online social network with over 216; 000 users as of November 16; 2011. It is a network of independent, federated Diaspora servers that are administrated by individual users who allow Diaspora users' profiles to be hosted on their servers. In this paper we take a first look at the Diaspora network's overall growth in terms of number of ... View full abstract»

There exists a variety of different peer-to-peer (P2P) protocols to support a wide range of distributed services, such as content distribution or data storage. In order to promote interoperability and facilitate the development of new P2P applications, common application programming interfaces (APIs) have been proposed. Unfortunately, most of these interfaces have stagnated, and fail to meet prese... View full abstract»

Multipath TCP (MPTCP) suffers from the degradation of goodput in the presence of diverse network conditions on the available subflows. The goodput can even be worse than that of one regular TCP, undermining the advantage gained by using multipath transfer. In this work, we propose a new multipath TCP protocol, namely NC-MPTCP, which introduces network coding (NC) to some but not all subflows trave... View full abstract»

The notion of flow rate fairness and TCP-friendliness is dominating the current design of transport protocols. Yet, it can be, and has been, argued that value in networks and applications often comes from other factors than simple bandwidth fairness. For example, web pages are mostly in the range of few hundred kilobytes and the utility of web sites are tied to how responsive they are, while strea... View full abstract»

Measurements of network parameters like bandwidths and latencies in wireless networks entail some new challenges. Especially cellular networks are highly dynamic furthermore, the potential mobility of the client can lead to frequent and spontaneous changes in the communication properties. Cellular networks are a shared medium, therefore, bandwidth is precious and should not be wasted. Thus, an imp... View full abstract»

Large ISPs have been growing rapidly in both the size and global connectivity. To scale with the sheer number of routers, many providers have replaced the flat full-mesh iBGP connectivity with a hierarchical architecture, using either Route-Reflection (RR) or AS confederation. Given that each intermediate iBGP router in the hierarchy selects and propagates only one best path per destination networ... View full abstract»

Detecting network traffic anomalies is crucial for network operators as it helps to identify security incidents and to monitor the availability of networked services. Although anomaly detection has received significant attention in the literature, the automatic classification of network anomalies still remains an open problem. In this paper, we introduce a novel scheme and build a system to detect... View full abstract»

A new addressing and routing design called the Less-Is-More Architecture (LIMA) is proposed as an inter-domain solution for a future Internet. Unlike recently proposed identifier-locator split solutions, LIMA uses just (topological) location-independent names and location-dependent addresses. The feasibility of using a policy combination of restricting stubs to provider-aggregatable addressing onl... View full abstract»

Many application scenarios envisioned as part of the `Smarter' Grid depend on an effective underlying communication infrastructure for power distribution. To this end, a linear chain wireless communication architecture is proposed in this work to meet communication requirements at the distribution level of the power grid. A theoretical study is done to understand the capacity limitations of using ... View full abstract»

The oscillation of frequency in power grid is studied using the tool of epidemic propagation over social networks, as well as a set of real measurements of frequencies at multiple locations in the US power grid. A logical network is used for analyzing the propagation, instead of the physical power network. The topology of the logical network is obtained from Bayesian network structure learning usi... View full abstract»

Nowadays, there is a conflict between the rapidly increasing demand for electricity and the requirement for reducing dependence on fossil fuel to decrease the greenhouse gas emissions. Proper utilization of renewable energy such as wind energy is proposed as an efficient solution to address this problem. However, due to the high inter-temporal variation and limited predictability, it is difficult ... View full abstract»

In this article, we present an economical analysis of the integration of purely electrical vehicles (EV) in the smart grid energy market using tools from mean field game theory. Our main contribution consist in a formal description of the mean field equilibrium of the resulting competitive interaction when EV owners buy and sell electricity from their cars, selfishly but rationally, based on colle... View full abstract»

In this paper, we propose a novel multi-layer market for analyzing the energy exchange process between electric vehicles and the smart grid. The proposed market consists essentially of two layers: a macro layer and a micro layer. At the macro layer, we propose a double auction mechanism using which the aggregators, acting as sellers, and the smart grid elements, acting as buyers, interact so as to... View full abstract»

In this paper, we propose a novel demand side management technique to reduce the peak load of the system. We consider a smart power system with distributed users that request their energy demands to an energy provider and the energy provider dynamically updates the energy prices based on the load profiles of the users. The users try to minimize the Peak-to-Average Ratio (PAR) of the power system b... View full abstract»

One of the major issues encountered in smart grids is the unpredictable fluctuation of power supply from renewable energy sources. As an alternative to the energy storage technologies to mitigate these effects, in this paper a robust power flow control scheme is proposed that allows microgrids to function at desired working levels by cooperatively sharing energy with one another. An H∞... View full abstract»

The increasing diffusion of Automatic Meter Reading (AMR) has raised many concerns about the protection of personal data related to energy, water or gas consumption, from which details about the habits of the users can be inferred. On the other hand, aggregated measurements about consumption are crucial for several goals, including resource provisioning, forecasting, and monitoring. This paper pro... View full abstract»

We consider the performance modeling and evaluation of network systems powered with renewable energy sources such as solar and wind energy. Such energy sources largely depend on environmental conditions, which are hard to predict accurately. As such, it may only make sense to require the network systems to support a soft quality of service (QoS) guarantee, i.e., to guarantee a service requirement ... View full abstract»

The advent of new Smart Grid applications such as electric vehicles and renewable energy sources are imposing challenging requirements on the stability and operation of the grid. This challenge is critical in the areas of supply-demand balance and power quality assurance. To address this challenge, phasor measurement units (PMUs) are being deployed to monitor grid operations. A major impediment to... View full abstract»

We propose a novel distributed approach to exploit sleep mode capabilities of links in an Internet Service Provider network. Differently from other works, neither a central controller, nor the knowledge of the current traffic matrix is assumed, favoring a major step towards making sleep mode enabled networks practical in the current Internet architecture. Our algorithms are able to automatically a... View full abstract»

The rising cost of electricity has forced business organizations to find new ways to cut energy spending. This paper studies how to reduce energy consumption in virtual network embedding, which embeds virtual networks (VNs) requested by users to a shared substrate network (SN) run by an infrastructure provider (InP). Previous research has primarily focused on finding embedding methods to increase ... View full abstract»

With a growing concern on the considerable energy consumed by data centers, research efforts are targeting toward green data centers with higher energy efficiency. In particular, server virtualization is emerging as the prominent approach to consolidate applications from multiple applications to one server, with an objective to save energy usage. However, little understanding has been obtained abo... View full abstract»