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Delay tolerant networks can not maintain end-to-end connectivity. Thus the routing is one of the critical issues. As we known, the two-level community model including the small community and the big community is proposed for the first time. In the same small community, any two member nodes are friends with each other. And in the same big community which is constructed of some small communities, any...
In this paper, a reliable and efficient alarm message broadcast routing is proposed for VANET. Unlike other similar routing algorithms, REAR is based on the real wireless channel in VANET. REAR uses less broadcast packets to propagate alarm message. According to the theory model of wireless channel, it estimates the receipt probability of alarm messages for nodes. The contention scheme based on the...
Localization of sensor nodes is an essential requirement for many wireless sensor network applications. As equipping GPS receivers to every node are prohibitively expensive with hundred of nodes in the system, GPS-less localization approach is necessary. In this paper, we present a low cost system based on measurements from a pedometer and communication ranging between neighboring nodes. The information...
Sensor nodes localization is an essential requirement for many applications in wireless sensor networks. The most straightforward approach is to equip GPS receivers or other sophisticated position sensors to every node. This could be prohibitively expensive if the system consists of hundred of nodes. In this paper, we present a low cost algorithm called probability field localization algorithm, which...
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