Abstract: A narrowband localization method including: concurrently transmitting, by a plurality of transmitters, a plurality of narrowband signals, wherein frequencies of respective narrowband signals are different from each other; receiving, by a receiver, a superimposed signal of the plurality of narrowband signals; and determining, by the receiver, a location of the receiver relative to the plurality of transmitters based on the superimposed signal received by the receiver.

Abstract: A method for scheduling transmissions between a controller node, one or more, and one or more uplink nodes comprising: defining one or more non-overlapping downlink and uplink timeslots within a maximum cycle time period; scheduling each of the downlink nodes to listen to receive a respective downlink transmission from a one or multiple radios of the controller node in one of the downlink timeslots on one of a plurality of channels such that none of the downlink transmissions conflict with each other; and scheduling each of the uplink nodes to transmit a respective uplink transmission to a controller radio in one of the uplink timeslots on one of the channels such that none of the uplink transmissions conflict with each other.

Abstract: A method of synchronizing clocks of a secondary node and primary node, the method comprising: the primary node transmitting a first message and an indication of that message's transmission time to the secondary node; the secondary node transmitting a second message to the primary node; the primary node transmitting a third message and an indication of that message's transmission time to the secondary node; the secondary node calculating a rate of its clock relative to the clock of the primary node using a ratio of times between the transmission and reception times of the first and third messages; and the secondary node calculating a time offset of its clock relative to the clock of the primary node using the calculated rate, a propagation delay and one of the indications of the transmission times of the first or third message.

Abstract: A method of synchronizing clocks of a secondary node and primary node, the method comprising: the primary node transmitting a first message and an indication of that message’s transmission time to the secondary node; the secondary node transmitting a second message to the primary node; the primary node transmitting a third message and an indication of that message’s transmission time to the secondary node; the secondary node calculating a rate of its clock relative to the clock of the primary node using a ratio of times between the transmission and reception times of the first and third messages; and the secondary node calculating a time offset of its clock relative to the clock of the primary node using the calculated rate, a propagation delay and one of the indications of the transmission times of the first or third message.

Abstract: A method for scheduling transmissions between a controller node, one or more, and one or more uplink nodes comprising: defining one or more non-overlapping downlink and uplink timeslots within a maximum cycle time period; scheduling each of the downlink nodes to listen to receive a respective downlink transmission from a one or multiple radios of the controller node in one of the downlink timeslots on one of a plurality of channels such that none of the downlink transmissions conflict with each other; and scheduling each of the uplink nodes to transmit a respective uplink transmission to a controller radio in one of the uplink timeslots on one of the channels such that none of the uplink transmissions conflict with each other.

Abstract: A narrowband localization method including: concurrently transmitting, by a plurality of transmitters, a plurality of narrowband signals, wherein frequencies of respective narrowband signals are different from each other; receiving, by a receiver, a superimposed signal of the plurality of narrowband signals; and determining, by the receiver, a location of the receiver relative to the plurality of transmitters based on the superimposed signal received by the receiver.

Abstract: A method of transmitting a data payload from one or more network nodes. The method includes transmitting a first data packet from a network node of the one or more network nodes and subsequently transmitting a second data packet from the network node of the one or more network nodes. The first data packet includes a set of blocks arranged in a first order and the second data packet including the set of blocks arranged in a second order that is different from the first order. Each block of the set of blocks includes a different section of the data payload and the sections of the data payload included by blocks of the set of blocks together define the entire data payload.

Abstract: A method of transmitting a data payload from one or more network nodes. The method includes transmitting a first data packet from a network node of the one or more network nodes and subsequently transmitting a second data packet from the network node of the one or more network nodes. The first data packet includes a set of blocks arranged in a first order and the second data packet including the set of blocks arranged in a second order that is different from the first order. Each block of the set of blocks includes a different section of the data payload and the sections of the data payload included by blocks of the set of blocks together define the entire data payload.

Abstract: A method of generating a communication schedule for a plurality of nodes in a multi-hop network, the plurality of nodes comprising a first node, a second node and a third node, wherein: the second node is a primary parent of the first node and the third node is a secondary parent of the first node. The method comprises requesting, by the first node, a first resource in the communication schedule for communication from the first node to the second node and a second resource in the communication schedule for communication from the first node to the third node.

Abstract: A method of generating a communication schedule for a plurality of nodes in a multi-hop network, the plurality of nodes comprising a first node, a second node and a third node, wherein: the second node is a primary parent of the first node and the third node is a secondary parent of the first node. The method comprises requesting, by the first node, a first resource in the communication schedule for communication from the first node to the second node and a second resource in the communication schedule for communication from the first node to the third node.