Abstract
Applications supporting various multimedia data in wireless multimedia sensor networks (WMSNs) have specific QoS requirements on bandwidth, delay, and/or packet loss. Perception of applications' QoS requirements and detection of link states are indispensable for the design of QoS-aware routing mechanism. Software defined networking (SDN) is suitable for the purpose since it provides visibility of network resources and programmable interfaces. OpenFlow is the most recognized realization of SDN. We propose a QoS-aware routing mechanism for OpenFlow-enabled WMSNs. The mechanism consists of a framework and routing algorithms on SDN controller. The framework includes two functions: detection of link states among OpenFlow-enabled nodes and determination of flow's QoS requirements. The routing algorithms are achieved in two steps. First, the SDN controller seeks the feasible paths that satisfy QoS requirements of a flow. If there is no path which satisfies the required QoS, the path will be decided by the proposed algorithms depending on flow types: delay-sensitive, bandwidth-sensitive, and best-effort traffic. We conducted experiments on a SDN testbed to evaluate our mechanism and compared the results with conventional routing protocols. The results show that proposed routing mechanism increases the throughput by 43% for video data and reduces the delay by more than 30% for audio data.
Highlights
Recent advances in cost-efficient hardware technology have set new stage for the deployment of wireless sensor networks (WSNs) with powerful sensor nodes in reasonable cost
We propose a routing mechanism for wireless multimedia sensor networks (WMSNs) based on Software defined networking (SDN) technology
This paper focuses on the satisfaction of flow’s QoS requirements, in order to guarantee the QoS of data delivery in resourceconstrained OpenFlow-enabled WMSNs
Summary
Recent advances in cost-efficient hardware technology have set new stage for the deployment of wireless sensor networks (WSNs) with powerful sensor nodes in reasonable cost. The paradigm is changing from scalar services (temperature, humidity, etc.) to real-time multimedia applications (video, audio, imaging, etc.). Examples of such wireless multimedia sensor network (WMSN) [1] applications include target tracking, environmental video/imaging surveillance, telemedicine, video vehicle detection, and battlefield intelligence [2,3,4,5]. High bandwidth and low delay requirements are major challenges for WMSNs and efficient QoS routing mechanisms are urgently needed to realize envisioned multimedia applications. Software defined networking (SDN) [6] paradigm seems to be promising to present better network resource management, traffic control, and application classification in order to design an efficient QoS-aware routing mechanism.
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