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    2.5 Proposed Architectures for SDN in WSN The novel idea of exploiting OpenFlow technology to address reliability issues in sensor networks was presented by (Arif Mahmud and Rahim Rahmani, 2011) at the IEEE International Conference on Computer Science and Network Technology while the first architectural proposal was presented by (Luo et al., 2012) in the form of Software Defined Wireless Sensor Network (SD-WSN). Up until now, very limited research work is carried out in this area. Some of the notable, proposed architectures for using SDN in WSN are: • Software Defined Wireless Sensor Network (SD-WSN) • TinySDN • Service-centric networking for URban-scale Feedback Systems (SURF) • Software Defined Networking in WIreless Sensor nEtworks (SDN-WISE) 2.5.1 Software Defined Wireless Sensor Network (SD-WSN) Figure 5: SD-WSN Architecture (Luo, Tan, and Quek, 2012) Software Defined Wireless Sensor Network (SD-WSN) presents the first effort to combine Software Defined Networking (SDN) and Wireless Sensor Networks (WSN). (Luo et al., 2012) state that the aim of their design was to tackle the problems of resource underutilisation, counter-productivity, rigidity in policy changes, and network management in WSN. The fundamental assumption made by the OpenFlow protocol is that the underlying network is composed of highly sophisticated networking devices. While on the other side, the WSN networks are composed of devices with low power and specifications. As OpenFlow was primarily…

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