Abstract: A system includes first and second access points. Each access point includes one or more 802.11 wireless radios configured to communicate with a wireless node. The first and second access points are both configured to wirelessly receive first data from the wireless node at substantially a same time and forward the first data. The first and second access points are also both configured to receive second data for the wireless node. The first access point is configured to wirelessly transmit the second data to the wireless node, and the second access point is configured to refrain from transmitting the second data to the wireless node while the first access point is operating properly.

Abstract: A system includes first and second access points. Each access point includes one or more 802.11 wireless radios configured to communicate with a wireless node. The first and second access points are both configured to wirelessly receive first data from the wireless node at substantially a same time and forward the first data. The first and second access points are also both configured to receive second data for the wireless node. The first access point is configured to wirelessly transmit the second data to the wireless node, and the second access point is configured to refrain from transmitting the second data to the wireless node while the first access point is operating properly.

Abstract: A system includes first and second access points. Each access point includes one or more 802.11 wireless radios configured to communicate with a wireless node. The first and second access points are both configured to wirelessly receive first data from the wireless node at substantially a same time and forward the first data. The first and second access points are also both configured to receive second data for the wireless node. The first access point is configured to wirelessly transmit the second data to the wireless node, and the second access point is configured to refrain from transmitting the second data to the wireless node while the first access point is operating properly.

Abstract: Systems and methods for improved location accuracy are provided. For example, some systems can include a location engine, and a plurality of location anchors. In some embodiments, each of the plurality of location anchors can transmit or receive signals to or from an object for determining an angular orientation of the object with respect to the plurality of location anchors, and based on the angular orientation, the location engine can estimate a location of the object. In some embodiments, each of the plurality of location anchors can transmit first signals to the location engine, the location engine can receive a second signal from an object, based on the first signals and the second signal, the location engine can determine a differential pressure between the plurality of location anchors and the object, and based on the differential pressure, the location engine can estimate an altitude of the object.

Abstract: Systems and methods for improved location accuracy are provided. For example, some systems can include a location engine, and a plurality of location anchors. In some embodiments, each of the plurality of location anchors can transmit or receive signals to or from an object for determining an angular orientation of the object with respect to the plurality of location anchors, and based on the angular orientation, the location engine can estimate a location of the object. In some embodiments, each of the plurality of location anchors can transmit first signals to the location engine, the location engine can receive a second signal from an object, based on the first signals and the second signal, the location engine can determine a differential pressure between the plurality of location anchors and the object, and based on the differential pressure, the location engine can estimate an altitude of the object.

Abstract: Systems and methods for improved location accuracy are provided. For example, some systems can include a location engine, and a plurality of location anchors. In some embodiments, each of the plurality of location anchors can transmit or receive signals to or from an object for determining an angular orientation of the object with respect to the plurality of location anchors, and based on the angular orientation, the location engine can estimate a location of the object. In some embodiments, each of the plurality of location anchors can transmit first signals to the location engine, the location engine can receive a second signal from an object, based on the first signals and the second signal, the location engine can determine a differential pressure between the plurality of location anchors and the object, and based on the differential pressure, the location engine can estimate an altitude of the object.

Abstract: A method including running a local low frequency clock in a node in a network during a battery conserving sleep mode, waking from the sleep mode at a time boundary determined by the low frequency clock, updating a representation of a master time based on a calculation and the time boundary, advancing the representation of master time based on a local high frequency clock while the node is awake, receiving a time synchronization signal from a node in the network, updating the calculation based on a difference between the representation of master time and a time provided in the time synchronization signal, setting a new time boundary, and returning to the sleep mode.

Abstract: A system includes multiple nodes, where each node includes one or more 802.11 wireless radios. The nodes are arranged in a hierarchical tree structure in which one or more nodes residing in one level of the tree structure are configured to communicate with one or more nodes residing in another level of the tree structure to propagate information in the tree structure. At least a first of the nodes is configured to operate its associated radio(s) in an 802.11 access point mode and in an 802.11 station mode. The first node is configured to relay data to and from one or more nodes in a lower level of the tree structure using the 802.11 access point mode. The first node is further configured to transmit data to and receive data from one or more nodes in a higher level of the tree structure using the 802.11 station mode.

Abstract: A plurality of wireless devices can obtain location related information from members of a plurality of location anchors located throughout a region being monitored. The devices can each send probes to the location anchors. The anchors which receive a probe can each respond with a signal carrying at least an anchor address. Each of the devices can process the respective received signal to establish a distance parameter, and, can forward the address and the distance parameter to a displaced location estimating engine.

Abstract: Systems and methods for improved location accuracy are provided. For example, some systems can include a location engine, and a plurality of location anchors. In some embodiments, each of the plurality of location anchors can transmit or receive signals to or from an object for determining an angular orientation of the object with respect to the plurality of location anchors, and based on the angular orientation, the location engine can estimate a location of the object. In some embodiments, each of the plurality of location anchors can transmit first signals to the location engine, the location engine can receive a second signal from an object, based on the first signals and the second signal, the location engine can determine a differential pressure between the plurality of location anchors and the object, and based on the differential pressure, the location engine can estimate an altitude of the object.

Abstract: A cloud-enabled low power Wi-Fi device is provided that includes a transceiver, a programmable processor, and executable control software stored on a non-transitory computer readable medium. The transceiver can be in a low power sleep mode until the programmable processor and the executable control software detect a first condition. When the programmable processor and the executable control software detect the first condition, the transceiver can exit the low power sleep mode and the programmable processor and the executable software can construct and transmit a message, via the transceiver, to a remote device. When the programmable processor and the executable control software detect a second condition, the transceiver can reenter the low power sleep mode.

Abstract: A cloud-enabled low power Wi-Fi device is provided that includes a transceiver, a programmable processor, and executable control software stored on a non-transitory computer readable medium. The transceiver can be in a low power sleep mode until the programmable processor and the executable control software detect a first condition. When the programmable processor and the executable control software detect the first condition, the transceiver can exit the low power sleep mode and the programmable processor and the executable software can construct and transmit a message, via the transceiver, to a remote device. When the programmable processor and the executable control software detect a second condition, the transceiver can reenter the low power sleep mode.

Abstract: A method including running a local low frequency clock in a node in a network during a battery conserving sleep mode, waking from the sleep mode at a time boundary determined by the low frequency clock, updating a representation of a master time based on a calculation and the time boundary, advancing the representation of master time based on a local high frequency clock while the node is awake, receiving a time synchronization signal from a node in the network, updating the calculation based on a difference between the representation of master time and a time provided in the time synchronization signal, setting a new time boundary, and returning to the sleep mode.

Abstract: Redundant, non-overlapping paths or routes for a sensor signal in a mesh network are selected based on predetermined metrics. In one embodiment, a wireless sensor transmits a signal that is received by two separate infrastructure nodes. The signal is retransmitted by the two intermediate nodes via the selected non-overlapping routes to a controller node. Routes are identified for at least two infrastructure nodes that receive signals from an added sensor. Performance metrics are calculated for each route. The two routes with the best performance metrics are selected in one embodiment.

Abstract: A system and method include determining an amount of network traffic to add to traffic in the network to emulate a desired condition, beginning a test of the network such that network nodes generate test traffic in accordance with the determined amount of network traffic to emulate the desired condition, receiving the test traffic, and calculating network performance measures as a function of the received test traffic.

Abstract: A system includes multiple nodes, where each node includes one or more 802.11 wireless radios. The nodes are arranged in a hierarchical tree structure in which one or more nodes residing in one level of the tree structure are configured to communicate with one or more nodes residing in another level of the tree structure to propagate information in the tree structure. At least a first of the nodes is configured to operate its associated radio(s) in an 802.11 access point mode and in an 802.11 station mode. The first node is configured to relay data to and from one or more nodes in a lower level of the tree structure using the 802.11 access point mode. The first node is further configured to transmit data to and receive data from one or more nodes in a higher level of the tree structure using the 802.11 station mode.

Abstract: A system includes first and second access points. Each access point includes one or more 802.11 wireless radios configured to communicate with a wireless node. The first and second access points are both configured to wirelessly receive first data from the wireless node at substantially a same time and forward the first data. The first and second access points are also both configured to receive second data for the wireless node. The first access point is configured to wirelessly transmit the second data to the wireless node, and the second access point is configured to refrain from transmitting the second data to the wireless node while the first access point is operating properly.

Abstract: Wireless communication systems using transmitter initiated communications methods. Several devices in the system listen by following a common frequency hopping sequence. When communication is desired, a transmitting device sends a request to send signal to an addressee; if available, the addressee sends a clear to send signal, and the transmitting device and the addressee then perform communications using a separate frequency hopping sequence. Methods for adding new devices are also included. In an example, a new device uses a discovery frequency hopping sequence to ping a number of frequencies until the common frequency hopping sequence is discovered. In another example, a new device listens on a single frequency forming part of the common frequency hopping sequence until the common frequency hopping sequence overlaps the single frequency.

Abstract: A plurality of wireless devices can obtain location related information from members of a plurality of location anchors located throughout a region being monitored. The devices can each send probes to the location anchors. The anchors which receive a probe can each respond with a signal carrying at least an anchor address. Each of the devices can process the respective received signal to establish a distance parameter, and, can forward the address and the distance parameter to a displaced location estimating engine.

Abstract: Wireless communication systems using transmitter initiated communications methods. Several devices in the system listen by following a common frequency hopping sequence. When communication is desired, a transmitting device sends a request to send signal to an addressee; if available, the addressee sends a clear to send signal, and the transmitting device and the addressee then perform communications using a separate frequency hopping sequence. Methods for adding new devices are also included. In an example, a new device uses a discovery frequency hopping sequence to ping a number of frequencies until the common frequency hopping sequence is discovered. In another example, a new device listens on a single frequency forming part of the common frequency hopping sequence until the common frequency hopping sequence overlaps the single frequency.