Wireless Hierarchical Heterogeneous Pico-Net for Ski Control Systems

摘要

A wireless hierarchical heterogonous pico-net providing communication between smart-phone based analysis and control application and multiplicity of sensors and actuators embedded in the ski equipment is described. The topology of this pico-net comprises two layers of hierarch, where the first layer is configured as a Bluetooth wireless network using a Round-Robin scheduling method and consisting of a single master and up-to seven slaves, and the second layer of the hierarchy is configured as a sub-nets consisting of multiplicity of sensors and actuators and communicating internally using ANT personal area network (PAN) wireless interface, or via a digital wire interface. Such network topology provides deterministic latency of a hierarchy a single-hop Bluetooth network, irrespective of the numbers of sensors and actuators embedded within each sub-net of the second layer of hierarchy. The network latency is upper-bounded by the number of slaves in the first layer of hierarch, Furthermore, the Round-Robin scheduling method is supplemented with the gating-off the slave RF transmission when the slave has no data to send, or when the difference between current sensor samples and the previous sensor sample is smaller then predefined threshold. Such discontinued transmission lowers slave power consumption system interference.

主权项

1. A wireless hierarchical heterogonous network providing communication between a smart-phone based analysis and control application and a multiplicity of sensors and actuators embedded in the ski equipment comprising:
a first layer of network hierarchy composed of a smart-phone based Bluetooth master transceiver and up to seven Bluetooth slave transceivers embedded in the ski equipment; a second layer of the network hierarch composed of up to seven network sub-nets, each comprising multiplicity of Microelectromechanical Systems (MEMS), sensors and actuators;and wherein the master of the first layer of the network hierarch using a Round-Robin scheduling scheme sends to each slave of the first layer of the network hierarch a control pocket comprising: an access code of the sub-net; a header of the packet consisting packet number; and the control packet payload comprising multiplicity of control records dedicated for each individual device within the sub-net; and wherein upon reception of said control packet, the slave responds with a packet data containing samples obtained from sensors located within the sub-net.