This paper deals with IEEE 802.15.4 beacon enabled and non beacon enabled multi-hop star wireless sensor networks with varying traffic loads. For high channel utilization & low power consumption, impact of MAC parameters such as beacon order (BO) and superframe order (SO) has been analyzed. IEEE 802.1.5.4 MAC works in two modes, beacon and non beacon mode. This paper provides the performance an...

Sensor networks play an important role to enhance indoor mobile applications. The sensor network for human detection in a house, for example, cooperates with a mobile application and automatically controls home appliances. To realize such enhancement in a vast indoor environment such as in a building, we face a sensor localization problem. We need to get location of huge number of sensor nodes ...

The human genetics community needs robust protocols that enable secure sharing of genomic data from participants in genetic research. Beacons are web servers that answer allele-presence queries--such as "Do you have a genome that has a specific nucleotide (e.g., A) at a specific genomic position (e.g., position 11,272 on chromosome 1)?"--with either "yes" or "no." Here, we show that individuals...

The beacon model is a recent paradigm for guiding the trajectory of messages or small robotic agents in complex environments. A beacon is a fixed point with an attraction pull that can move points within a given polygon. Points move greedily towards a beacon: if unobstructed, they move along a straight line to the beacon, and otherwise they slide on the edges of the polygon. The Euclidean dista...

In beacon-enabled mode, beacon collision is a significant problem for the scalability of cluster-tree wireless sensor networks. In this paper, multichannel window scheduling (MCWS) is proposed to prevent beacon collisions and provide scalability. It enables large-scale wireless sensor networks based on a cluster tree to be scalable and effectively constructed.

In this paper, an IEEE 802.15.6 wireless body area networks (WBAN) medium access control protocol is developed to support a wireless USB (WUSB) application as a protocol adaptation layer (PAL). Even though we can avoid colliding packets using CSMA/CA, hazard of beacon collisions still remains in the WUSB over WBAN networks. Further, in order to solve beacon conflict problem, we introduce a mult...

The design and implementation of a 1.9GHz radio frequency transmit beacon is presented. The beacon is completely selfcontained, and all necessary energy is scavenged through solar and vibrational energy sources. Custom RF integrated circuitry and energy scavenging devices are used to create a highly integrated and efficient beacon. The 1.9GHz direct modulated transmitter uses a micromachined re...