GPS-Free Event-to-Sink Routing Scheme for Data Aggregation in Wireless Sensor Networks

Recently, many researchers address on the problem of reducing power consumption for data aggregation in wireless sensor networks. However, many existing event-to-sink routing schemes for data aggregation require assistance from a global positioning system (GPS), which is not always available. In this paper, we propose a GPS-free event-to-sink routing scheme for data aggregation in wireless sensor networks (GFESR). In GFESR, an axis-based virtual coordinate assignment protocol (ABVCap) that requires no GPS assistance is used to assign each node at least a virtual coordinate in wireless sensor networks. The event-to-sink routing scheme based on ABVCap is proposed to aggregate data for reducing the power consumption. In GFESR, the sensors are grouped into a number of cells. The events in the same cell are aggregated by intra-cell routing scheme and the events in different cells are aggregated by inter-cell routing scheme.