The Internet has led to the creation of a digital society, where (almost) everything is connected and is accessible from anywhere. However, despite their widespread adoption, traditional IP networks are complex and very hard to manage. It is both difficult to configure the network according to predefined policies, and to reconfigure it to respond to faults, load, and changes. To make matters even more difficult, current networks are also vertically integrated: the control and data planes are bundled together. Software-defined networking (SDN) is an emerging paradigm that promises to change this state of affairs, by breaking vertical integration, separating the network's control logic from the underlying routers and switches, promoting (logical) centralization of network control, and introducing the ability to program the network. The separation of concerns, introduced between the definition of network policies, their implementation in switching hardware, and the forwarding of traffic, is key to the desired flexibility: by breaking the network control problem into tractable pieces, SDN makes it easier to create and introduce new abstractions in networking, simplifying network management and facilitating network evolution. In this paper, we present a comprehensive survey on SDN. We start by introducing the motivation for SDN, explain its main concepts and how it differs from traditional networking, its roots, and the standardization activities regarding this novel paradigm. Next, we present the key building blocks of an SDN infrastructure using a bottom-up, layered approach. We provide an in-depth analysis of the hardware infrastructure, southbound and northbound application programming interfaces (APIs), network virtualization layers, network operating systems (SDN controllers), network programming languages, and network applications. We also look at cross-layer problems such as debugging and troubleshooting. In an effort to anticipate the future evolution of this new paradigm, we discuss the main ongoing research efforts and challenges of SDN. In particular, we address the design of switches and control platforms—with a focus on aspects such as resiliency, scalability, performance, security, and dependability—as well as new opportunities for carrier transport networks and cloud providers. Last but not least, we analyze the position of SDN as a key enabler of a software-defined environment.

https://publications.uni.lu/bitstream/10993/20596/1/survey_on_SDN.pdf

Software-Defined Networking: A Comprehensive Survey

Network use has evolved to be dominated by content distribution and retrieval, while networking technology still speaks only of connections between hosts. Accessing content and services requires mapping from the what that users care about to the network's where. We present Content-Centric Networking (CCN) which treats content as a primitive - decoupling location from identity, security and access, and retrieving content by name. Using new approaches to routing named content, derived heavily from IP, we can simultaneously achieve scalability, security and performance. We implemented our architecture's basic features and demonstrate resilience and performance with secure file downloads and VoIP calls.

/pdf/networking-named-content-ymua8rkdmw.pdf

Networking named content

Current network use is dominated by content distribution and retrieval yet current networking protocols are designed for conversations between hosts. Accessing content and services requires mapping from the what that users care about to the network's where. We present Content-Centric Networking (CCN) which uses content chunks as a primitive---decoupling location from identity, security and access, and retrieving chunks of content by name. Using new approaches to routing named content, derived from IP, CCN simultaneously achieves scalability, security, and performance. We describe our implementation of the architecture's basic features and demonstrate its performance and resilience with secure file downloads and VoIP calls.

Together with an explosive growth of the mobile applications and emerging of cloud computing concept, mobile cloud computing (MCC) has been introduced to be a potential technology for mobile services. MCC integrates the cloud computing into the mobile environment and overcomes obstacles related to the performance (e.g., battery life, storage, and bandwidth), environment (e.g., heterogeneity, scalability, and availability), and security (e.g., reliability and privacy) discussed in mobile computing. This paper gives a survey of MCC, which helps general readers have an overview of the MCC including the definition, architecture, and applications. The issues, existing solutions, and approaches are presented. In addition, the future research directions of MCC are discussed. Copyright © 2011 John Wiley & Sons, Ltd.

A survey of mobile cloud computing: architecture, applications, and approaches

Matrix Factorization Techniques for Recommender Systems

Beyond offering the widely used keyword search function, many peer-to-peer systems nowadays support the subscription function. For example, Vuze allows users to create subscription filters based on the keyword search. Given the subscription, episodic or related content will be delivered to the users whenever new episodes are available. Unfortunately, these applications suffer from the downsides, for example, high network traffic in the nodes maintaining popular terms. In this paper, we propose the MTAF mechanism to overcome the issues. The key of MTAF is to carefully select a subset of terms without incurring false negatives and to forward the content item toward the home nodes of such selected terms for low content forwarding cost. Experimental results based on real datasets indicate that the proposed solutions are efficient compared to existing approaches. In particular, the similarity-based replication of filters is shown to mitigate the effect of hot spots that arise due to the fact that some document terms are substantially more popular than the others.

MTAF: An Adaptive Design for Keyword-Based Content Dissemination on DHT Networks

the 16th ACM international conference on Modeling, analysis & simulation of wireless and mobile systems (MSWiM'13); Barcelona, Spain; November 3-8, 2013

Mobile operating systems are a relatively new development in the computing world. Mostly they are based on some existing older OS, typically written for stationary computers and laptops. For example, Android is based on the Linux kernel, iOS on the Mac OS X kernel, and Windows Phone on the Windows NT kernel. The mobile OS borrows many features from the desktop world; however, it needs to meet the demands of the mobile environment for communication needs, positioning of the device, power challenges caused by mobile operation with rechargeable batteries, and smaller size for the convenience and comfort of users. The OS is responsible for overseeing and managing the hardware and software components on the smartphone and it is responsible for the system-level power management. In this chapter, we examine four current state-of-the-art smartphone OSs – iOS, Windows Phone, Firefox OS, and Android – as well as a number of energy-conserving research prototypes. We focus on the current generation of mobile OSs given our focus on smartphones. Classical examples of earlier feature phone OSs include the Symbian OS and Windows Mobile [1]. After examining the four smartphone OSs, we compare their features and properties. Overview Power management is an integral part of an OS that operates on multiple levels from drivers to applications. As the functionalities and features of mobile devices are constantly growing so is the demand for power.

Mobile operating systems

Filter-based publish/subscribe and content-based routing have been proposed for flexible information dissemination in distributed environments. A content-based router is part of an overlay structure, in which each router forwards events to neighbouring routers and local clients based on their interests. Filter merging or summarization has been proposed as an optimization strategy in this environment. These techniques combine filters to reduce the number of propagated filters and thus the size of distributed state. In this paper, we present the algorithms for generic dynamic filter merging and discuss integration with routing tables. The algorithms are based on a formal framework of merging rules. Experimental results are examined and analyzed for both desktop systems and small devices. The results indicate that dynamic filter merging is feasible given that the workload is mergeable.

Dynamic Filter Merging for Publish/Subscribe

This paper presents SLA (Segment Level Authentication), a transport segment level solution designed to prevent both of the intra-domain and inter-domain source spoofing SLA is based on public key cryptography authentication It enables intermediate network nodes the ability to validate the packet authenticity by verifying authentication information carried in packets Although public key cryptography is computationally intensive and induces the traffic overhead, SLA leverages FPGA (Field Programmable Gate Array) based ECC (Elliptic Curve Cryptography) hardware cryptography accelerator to decrease the computation and traffic overhead SLA provides incremental deployment and offers incentives for both of hosts and ASes We find that the SLA is feasible for Gigabit links and can effectively mitigate source spoofing in both of intra-domain and inter-domain networks

Sasu Tarkoma

Papers

MTAF: An Adaptive Design for Keyword-Based Content Dissemination on DHT Networks

the 16th ACM international conference on Modeling, analysis & simulation of wireless and mobile systems (MSWiM'13); Barcelona, Spain; November 3-8, 2013

Mobile operating systems

Dynamic Filter Merging for Publish/Subscribe

Segment Level Authentication: Combating internet source spoofing