Real-time Data Dissemination for Mobile Sink via 2-Level Virtual Infrastructure in Wireless Sensor Networks
Seungmin Oh, Yongbin Yim, Jeong-Cheol Lee, Hosung Park, Sang‐Ha Kim · 2011
In wireless sensor networks, the studies achieve real-time data dissemination to static sinks by a spatiotemporal communication approach which forwards data per hops with an initially calculated delivery speed. However, in case of mobile sink, since the sink moves randomly around thus the distance between the sink and the source is dynamically changed, real-time data dissemination could not be guaranteed with the delivery speed. Therefore, we define requirements for real-time data dissemination to mobile sinks and propose a new scheme based on the requirements. In the scheme, the networks construct a two-level grid-based virtual infrastructure: the coarse-grained grid and the fine-grained grid. The coarse-grained grid and fine-grained grid structure manages real-time data dissemination from source to the grid leader of a mobile sink and from the grid leader of the mobile sink to the sink, respectively. The real-time data dissemination from a source to a sink is achieved by real-time data dissemination of both the coarse-grained grid and fine-grained grid. The simulation results show that the proposed scheme superior to the existing scheme in terms of guaranteeing of real-time data dissemination.