The real-time data dissemination schemes exploit the spatiotemporal communication approach which forwards data at the delivery speed calculated with the desired time deadline and the end-to-end distance in wireless sensor networks (WSNs). However, the schemes do not focus on the reliable communication. Recently, MMSPEED is a well-known scheme for both reliable and real-time data delivery based on multipath. For construction of the multipath in MMSPEED, the relay nodes branch off by local decision. Namely, in order to improve the reliability, MMSPEED locally chooses branch nodes among neighbor nodes which fulfill the real-time constraints and have the better reachability to the sink. However, since the paths are branched off blindly, the branched paths have no information of each other. So, the paths could be merged each other. The end-to-end reliability of multipath could decrease due to the failure of the merged path. Moreover, as the reachability to the sink is not estimated but calculated, the value could not be applied for reliability in real world. In this paper, we propose a reliable and real-time service protocol with geographical parallel track concept. The parallel track concept provides the information of each path to all paths. In the proposed protocol, the branch of multipath occurs only by real-time constraint. Simulation results show that the proposed protocol is superior to the related studies in terms of successful data delivery in desired time deadline.
['Seungmin Oh', 'Yongbin Yim', 'Jeongcheol Lee', 'Hosung Park', 'Sang-Ha Kim']
A novel reliable data dissemination protocol for real-time data in wireless sensor networks