A Software-Defined Networking Framework to Provide Dynamic QoS Management in IEEE 802.11 Networks

Abstract

In this paper, the concept of SDN (Software Defined Networking) is extended to be applied to wireless networks. Traditionally, in a wired SDN environment, the OpenFlow protocol is the communication protocol used to configure the flow table of forwarding elements (i.e., switches and Access Points). However, although in IEEE 802.11 networks there is no concept of forwarding, the SDN paradigm could also be applied to set up the wireless network dynamically, in order to improve the performance. In this case, not only the network elements, that is the Access Points, but also the mobile elements should configure their link and physical layers parameters following the guidelines of a centralized SDN controller. In particular, we propose a mechanism called DEDCA (Dynamic Enhanced Distributed Channel Access) to manage the channel access in wireless networks, and a framework that enables its implementation in 802.11-based wireless networks using SDN technology. The key aspect of this alternative solution is the control over the contention window size of the wireless terminals. Thus, an adequate response to dynamic and short-term Quality of Service (QoS) requirements can be offered to services running on these networks. DEDCA mechanism relies upon the use of a scalar parameter called gain. The mathematical model which has allowed us to obtain this parameter is presented and evaluated in this paper. Finally, the usefulness of the proposed solutions have been evaluated by means of their implementation in an example case.

NovaGenesis Applied to Information-Centric, Service-Defined, Trustable IoT/WSAN Control Plane and Spectrum Management

“…For the first time, name-based routing of the best channel indications is demonstrated in laboratory. In contrast to other works [ 20 , 22 , 26 , 27 , 37 , 38 , 39 ], results have been obtained in a field-trial experiments. “Semantic rich” orchestration of DSM services.…”

“… D3—NovaGenesis made possible name-based access and routing of spectrum sensing data, including network caching for efficient, distributed and coherent software-control (control plane) of smart environments. D4—Integration of software-defined control and operation [ 37 , 49 ]. The current SDN model (based on the OpenFlow protocol) is limited to configure forwarding tables at link layer switches.…”

“…D4—Integration of software-defined control and operation [ 37 , 49 ]. The current SDN model (based on the OpenFlow protocol) is limited to configure forwarding tables at link layer switches.…”

“…Another convergence is spectrum management (D1) and SDN (D4). In [ 37 ], an enhanced distributed channel access (EDCA) technique was integrated to an SDN controller. Access points and mobile devices configured channels accordingly to a SDN controller.…”

High Performance SDN WLAN Architecture

“…Our vision is to follow recent trends and provide solution to simplify network management based on SDN WLAN infrastructures [4] and good mobility management. The reasons of selecting the SDN architecture for the concept of a personal access point are: representation of the modern approach in networking; distributed networks use non-standard components for required functionality; simplify solving problem of radio resources control and does not introduce additional problems.…”