Wireless Hierarchical Heterogeneous Pico-Net for Ski Control Systems
First Claim
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.
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Abstract
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.
27 Citations
19 Claims
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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:
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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.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A computer accessible non-transitory memory medium for storing program instructions configured to control a hierarchical network providing communication between a smart-phone based analysis and control application and a multiplicity of sensors and actuators configured as a sub-nets and embedded in the ski equipment, wherein the program instructions executes all of the following:
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in each time slot dedicated to the Bluetooth master transmission, using a Round-Robin scheduling method, the master sends to the selected sub-nets a control packet comprising control commands to all devices located within the selected sub-net; in each time slot dedicated to the Bluetooth master reception, the Bluetooth master receives sensor data packet from the selected sub-net, and if said transmission was not received, uses data packet received in the previous schedule time. - View Dependent Claims (13, 14, 15)
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16. A computer accessible non-transitory memory medium for storing program instruction configured to control the sub-net of the network providing communication between a smart-phone based analysis and control application and a multiplicity of sensors and actuators configured as a sub-nets and embedded in the ski equipment, wherein the program instructions execute all of the following:
for each control packet received from the Bluetooth master, the sub-net control processor performs the following; for each sensors identified in the accelerometer record retrieves sensor samples, compares the current sample with the previous sample, and if the difference between said consecutive samples is smaller then the predefined threshold, replaces the new sample with the ‘
zero’
value;assembles samples from all sensors into a sensor data packet, and if said data packet contains values other then ‘
zeros’
sends said packet to the Bluetooth slave for transmission to the master, otherwise slave transmission is disabled;for each actuator identified in the control packet retrieve the actuator control word, and applies said control word as an address to the look-up table (LUT), then uses the value stored in this location as a control signal for the selected actuator. - View Dependent Claims (17, 18, 19)
Specification