QCM2R: A QoSaware crosslayered multichannel multisink routing protocol for stream based wireless sensor networks Abstract   Unlike the scalar data (such as temperature, pressure and humidity), the vector data (such as image, audio and video) necessitates more stringent Quality of Service (QoS) requirements in terms of bandwidth, delay, reliability and information security. These QoS requirements can be hardly achieved in a proper fashion by using a single channel for wireless communication. However, multichannel methodology may assist in accomplishing these QoS requirements by making possible parallel communication, enhancing throughputdelivery ratio, reducing transmission delay and countering jamming attacks. Furthermore, enabling data gathering at multiple points (i.e. multisink approach) may improve QoS by handling congestion, avoiding single point of failure issue and making possible load balancing between the available routes towards the corresponding destinations. To achieve reliable communication in stream based multichannel Wireless Sensor Networks (WSNs), this work proposes a novel QoSaware Crosslayered Multichannel Multisink Routing protocol (QCM2R) for WSNs. For substantiating the performance of QCM2R protocol, the simulations are performed in NS xe2x88x92 2 demonstrating the performance superiority of the proposed QCM2R protocol against the counterpart in terms of network lifetime, reliability, delay and throughput.

Exploring ControlMessage Quenching in SDNbased Management of 6LoWPANs This paper draws attention to techniques available for the minimization of control overhead in softwaredefined wireless sensor networks (SDWSNs). Softwaredefined networking (SDN) promises improved management flexibility and control for inherently resourceconstrained and heterogeneous wireless sensor network (WSN) implementations. However, due to the inband traffic channel available for data and control traffic in SDNbased WSNs, overhead control traffic has been viewed as a bottleneck affecting network performance and controller responsiveness. A discussion on the need for control message quenching (CMQ) and the various categories of CMQ implementations in SDWSN is made in this paper. Furthermore, a CMQ algorithm based on reducing duplicate flow request packets is discussed and demonstrated for implementation in an SDNbased WSN framework. Results show a significant reduction in control overhead traffic and noticeable improvement in energy efficiency. However, tradeoffs in terms of packet delivery rate and packet delay are also observed as a result of the CMQ algorithm. A discussion on future work necessary to optimize CMQ algorithms in order to minimize the associated tradeoffs is also made.