A geography-free routing protocol for wireless sensor networks

In wireless sensor networks, it is critical to provide the data delivery services between sensors and the data collection unit (called sink). Some of the existing approaches require location or II) information which is quite expensive. For those without location or ID information, the usage of the collected information is rather limited. In this paper, we propose a geography-free coordinate system, called GREENWIS, to assist routing. In GREENWIS, sensors are identified by a 4-tuple with which messages are universally transmitted. Our analysis and experiments show that GREENWIS is reliable and power efficient compared with existing approaches.