Toward hybrid RPL based IoT sensing for smart city

Smart cities rely on monitoring information gathered by a large number of Wireless Sensor Network (WSN) nodes for decision and policymaking. Recently, Mobile Crowd Sensing (MCS) leveraging the latest smartphone features of sensing and networking has also participated in many smart city monitoring applications. However, both of these sensing technologies come with challenges. WSN faces network latency and limited lifetime problems due to the nature of the used constrained IoT small devices. In the other hand, most of MCS current applications use direct internet connection for sending collected data to the server using a 3G or LTE network. However, this is considered costly in terms of data tariff and high battery consumption. This paper proposes a new technique which combines both sensing technologies (WSN and MCS) in a cost effective way to overcome their limitations and leverage their benefits. The idea is to design a hybrid routing protocol framework based on the RPL protocol which will enable the integration of WSN and MCS. The aim is to benefit from MCS nodes opportunistically to support static WSN.