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.

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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

Wi-Fi networks are largely served using over-the-counter commodity Wi-Fi routers, access points (APs), and possibly with wireless controllers. Existing approaches to bring the benefits of Software-defined Networking (SDN) to such Wi-Fi networks suffer from availability, hardware requirements, and scalability issues. For instance, these approaches do not support enterprise APs whose firmware cannot be modified. Furthermore, we observe that using SDN controllers for managing all the flows traversing these APs and routers requires more than just installing an SDN switch on these devices. In this paper, we present our solution called SWIFT: Software-defined Wi-Fi Flow Management, for bringing SDN-based flow management to Wi-Fi networks using commodity Wi-Fi APs, Wi-Fi routers, and Wi-Fi controllers. We also detail its benefits, shortcomings, and possible use cases. Specifically, our solution significantly lowers the barrier-to-entry for deploying and conducting research on software-defined Wi-Fi networks.

SWIFT: Bringing SDN-Based Flow Management to Commodity Wi-Fi Access Points

This paper follows the history of the term “cloud” from the beginning of the Internet to the era of cloud computing, and ponders its past and current meaning We argue that outsourcing is the primary meaning of “cloud” We discuss elasticity and its significance in cloud computing Elasticity is a key cost-cutting measure, especially for startup companies, but is not a requirement for cloud systems We discuss the simple service layer model and the role of software components on different layers We refine the model to better capture real-world use cases This is achieved by dividing the layers into solutions and solutions further into components Finally, we define a new computing business model In this model, a company manages the entire computing experience of users We conclude with discussion of the new business model and the possibilities it offers for users of the cloud

What is "Cloud"?

HIIT conducts internationally high-level strategic research in information technology and related multi-disciplinary topics, especially in areas where Finnish IT industry has or may reach a significant global role. HIIT works in close co-operation with Finnish universities, research institutes, and industry, aiming to improve the contents, visibility, and impact of Finnish IT research to benefit the competitiveness and progress of the Finnish information society. HIIT also aims at creating a strong network of international partnerships with leading foreign research universities and institutions.

State of the art in enablers for applications in future mobile wireless internet

In this paper, we propose an architecture for secure push services for mobile users that supports common-of-the-shelf (COTS) WLAN base stations. The architecture focuses on the creation of flexible access networks based on easily deployable base stations. The push functionality is realized using client-initiated connections with SIP, and TLS or dTLS for security. The central building block of the distributed system is the edge proxy, which manages and implicitly authenticates all inbound connections, and performs privacy enhancement. The main driving force of our architecture has been airline services, but the system is applicable also for other service domains.

Sasu Tarkoma

Papers

SWIFT: Bringing SDN-Based Flow Management to Commodity Wi-Fi Access Points

What is "Cloud"?

State of the art in enablers for applications in future mobile wireless internet

Secure push for mobile airline services

The 19th annual international conference on Mobile computing & networking (MobiCom '13)