Power optimization of Control-plane Signaling in Fog-Assisted Wireless SDN using Hybrid-Hop Transmission
DOI:
https://doi.org/10.31185/wjes.Vol14.Iss2.978Keywords:
SDN-WISE, Fog Controller, Hybrid-Hop, Relay Node, Power consumption of Control PlaneAbstract
Software-Defined Wireless Sensor Networks (SDN-WISE) provide a centralised control mechanism with flexible programmability for large IoT deployments. However, placing the SDN controller exclusively in the cloud layer introduces excessive energy consumption in the control plane signaling, especially for distant sensor nodes. The problem is exacerbated when sending control packets over long distances using single-hop transmission. To tackle this drawback, this paper presents an energy-aware hybrid-hop architecture in which a Fog-based controller is placed near the edge of the network, and a relay-assisted hybrid-hop mechanism triggered for far-off nodes. Using numerical data to study how much control signaling energy is required for Single-Hop, Relay-based Multi-Hop, and Hybrid-Hop, a Mathematical Energy Model is created to compare the respective aspects. Considering transmission, reception, and processing energy (the latter, which includes the relay node), an analytical threshold distance is obtained, which defines when the sensor node should transition from a direct transmission mechanism to a relay-based forwarding mechanism. MATLAB simulation results indicate that the proposed Hybrid-Hop Fog-based architecture reduces the power consumption for control plane signaling by an estimated (18%-20%) compared to a classical Cloud-based SDN-WISE configuration. These results demonstrate that the application of Fog computing and hybrid-hop signaling can contribute to the energy-efficient design of SDN-WISE IoT networks
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