A wireless sensor network consists of many low-cost, low-power sensor nodes, which can
perform sensing, simple computation, and transmission of sensed information. Long …

One approach to prolong the lifetime of a wireless sensor network (WSN) is to deploy some
relay nodes to communicate with the sensor nodes, other relay nodes, and the base …

The relay node placement problem for wireless sensor networks is concerned with placing a
minimum number of relay nodes into a wireless sensor network to meet certain connectivity …

Two fundamental functions of the sensor nodes in a wireless sensor network are to sense its
environment and to transmit sensed information to a basestation. One approach to prolong …

A two-tiered network model has been proposed for prolonging lifetime and improving
scalability in wireless sensor networks (Gupta, G. and Younis, M., Proc. IEEE WCNC'03, p …

In wireless sensor networks, relay node placement has been proposed to improve energy
efficiency. In this paper, we study two-tiered constrained relay node placement problems …

Scalability and extended lifetime are two critical design goals of any large scale wireless
sensor network. A two-tiered network model has been proposed recently for this purpose …

Energy efficient system design in wireless sensor networks has been previously discussed
at different levels of the network protocol stack so as to provide the maximum possible …

Sensors typically use wireless transmitters to com-municate with each other. However,
sensors may be located in a way that they cannot even form a connected network (eg, due to …

This paper addresses the following relay sensor placement problem: given the set of duty
sensors in the plane and the upper bound of the transmission range, compute the minimum …