Real-time asset location system and method with long-range wireless backhaul

• US 9,652,955 B1
• Filed: 06/21/2016
• Issued: 05/16/2017
• Est. Priority Date: 06/21/2016
• Status: Active Grant

• Current Assignee: Link Labs, Inc.
• Original Assignee: Link Labs, Inc.
• Inventors: Ray, Brian Emery, Bloechl, Mark Olden
• Primary Examiner(s): Nguyen, Nam V
• Application Number:
  US15/187,844
• Time in Patent Office: 329 Days
• Field of Search: 3405721, 34053913, 34053921, 340 101, 340 105, 604361
• CPC Class Codes: G01S 2205/01 specially adapted for specific applications
• CPC Class Codes: G01S 5/0081 Transmission between base stations
• CPC Class Codes: G01S 5/02 using radio waves using satellite radio beacon systems for determining position G01S19/00
• CPC Class Codes: G01S 5/0226 Transmitters
• CPC Class Codes: G06Q 10/08 Logistics, e.g. warehousing, loading or distribution; Inventory or stock management
• CPC Class Codes: G06Q 10/087 Inventory or stock management, e.g. order filling, procurement or balancing against orders
• CPC Class Codes: G08B 25/007 Details of data content structure of message packets; data protocols
• CPC Class Codes: G08B 25/009 Signalling of the alarm condition to a substation whose identity is signalled to a central station, e.g. relaying alarm signals in order to extend communication range
• CPC Class Codes: G08B 25/10 using wireless transmission systems G08B25/009 takes precedence
• CPC Class Codes: G16H 40/20 for the management or administration of healthcare resources or facilities, e.g. managing hospital staff or surgery rooms
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04W 4/023 using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A system and method for transmitting information using first and second wireless communication protocols, including an object having a short range radio frequency signal transmitter for transmitting a signal using the first protocol, the signal including information transmitted from the object; a collector including a signal receiver for receiving the signal transmitted by the short range radio frequency transmitter and further including a collector transmitter that transmits a collector signal using the second protocol via a low power wide area network, the collector signal including the information transmitted from the object; a gateway in wireless communication with the collector via the low power wide area network, the gateway including a gateway receiver for receiving the collector signal; a processing application for processing the information transmitted from the object and creating an information processing outcome; and an end user terminal having an interface for displaying the information processing outcome.

Claims

1. A method of identifying a location of one or more objects to be located in real time, comprising:

sending a beacon advertisement message from an object, to be located from among the objects to be located in real time, to a collector via a first wireless communications protocol, the first wireless communications protocol being a short range radio frequency communications protocol, the beacon advertisement message including a unique MAC (Media Access Control) address;

processing the beacon advertisement message at the collector, thereby creating a collector processing result;

sending the collector processing result from the collector to a gateway via a second wireless communications protocol, the second wireless communications protocol being a low power wide area network communications protocol;

relaying the collector processing result from the gateway to one or more upstream components;

further processing the collector processing result, thereby determining the unique MAC address corresponds to the object and creating a location identification processing result, the location identification processing result identifying the location of the object; and

displaying the location identification processing result on an end user terminal,

wherein the gateway is configured to communicate with the one or more upstream components so as to establish selective identification and location determination, by one or more of the upstream components and from among the objects to be located in real time, of the object to be located and which sends the beacon advertisement message that is processed to create the collector processing result.

2. The method of claim 1, wherein the second wireless communications protocol is a chirp spread spectrum radio modulation format that transmits the collector processing result over a long range between the collector and the gateway.

3. The method of claim 2, wherein the second communications protocol includes receiving wirelessly a current instance of a beacon signal periodically-transmitted;

measuring a received power, PB-RX, of the beacon signal;

reading locally-stored values of PB-TX and G representing a presumed transmitted power of the beacon signal and a performance goal, respectively;

determining, for a given channel, a path loss, PL, based on the PB-RX and the PB-TX; and

adaptively setting an energy level, EN-TX, of a forthcoming signal to be transmitted based on PL and G.

4. The method of claim 3, wherein the adaptively setting includes:

adaptively determining, for the forthcoming signal, at least two of;

a level of power, PN-TX;

a forward error correction coding rate, c; and

a spreading factor, SF; and

a modulation format, M.

5. The method of claim 4, wherein the adaptively determining includes:

solving a standard optimization problem using the PL and the G as inputs to find a desirable minimized combination of the least two of;

a level of power, PN-TX;

a forward error correction coding rate, c; and

a spreading factor, SF; and

a modulation format, M.

6. The method of claim 3, wherein values of the performance goal G include:

values that maximize data-reliability of the data as received at the central node;

values that optimize the energy level EN-TX relative to battery-chemistry-specific attributes of the battery sourcing the end node; and

values that reflect a desired ratio of data-reliability versus battery management.

7. The method of claim 3, wherein:

the transmitted power, PB-TX, of the beacon signal changes over time; and

the method further comprises;

receiving instances of a configuration signal periodically-transmitted from the central node, each instance including a value representing a transmitted power, PB-TX, of forthcoming instances of the beacon signal; and

storing the received value of PB-TX locally as the presumed transmitted power of the beacon signal.

8. The method of claim 7, wherein:

the configuration signal is received at an interval, ICONFIG; and

the beacon signal is received at an interval, IBEACON; and

at least one of the following relations is true;

IBEACON<

ICONFIG;

ICONFIG=15*(IBEACON); and

ICONFIG=30 seconds and IBEACON=2 seconds.

9. The method of claim 3, wherein the second wireless communications protocol includes wirelessly transmitting according to the energy level EN-TX.

10. The method of claim 9, wherein the second wireless communications protocol includes wirelessly transmitting in an unlicensed spectrum, and the beacon signal is a non-hopping signal.

11. The method of claim 2, wherein the second wireless communications protocol includes communicating over an unlicensed spectrum, further including:

wirelessly receiving, an instance of a non-hopping beacon signal, B, periodically-transmitted;

each instance B(i) of the beacon signal including;

a frame number, FN(i), of a frame corresponding thereto; and

an identification, IDCN, of the gateway;

interpreting a frequency-block hopping guide according to FN(i) and IDCN thereby to determine a corresponding set, CSET(i), of at least two channels available to the end node for transmission thereover, respectively, during frame FN(i);

wherein the frequency-block hopping guide establishes;

a total of L frames;

a set of channels CSET for each frame, respectively; and

that, for any two consecutive ones of the L frames, FN(j) and FN(j+1), the corresponding sets CSET(j) and CSET(j+1) will be different, CSET(j)≠

CSET(j+1);

selecting, at least pseudo-randomly, at least one channel amongst the set CSET(i); and

wirelessly transmitting at least one message using the at least one selected channel, respectively;

wherein i and j are non-negative integers, L is an integer and 2≦

L.

12. The method of claim 11, wherein the frequency-block hopping guide, for any given frame FN(j), further establishes:

the corresponding set of channels CSCET(j) includes N blocks, 2≦

N;

each block in CSET(i) includes P contiguous channels, 2≦

P;

each channel in CSET(j) is a member of only one of the blocks of CSET(j); and

N and P are positive integers.

13. The method of claim 12, wherein the frequency-block hopping guide further establishes:

how, for any two consecutive ones of the L frames, FN(j) and FN(j+1), channels comprising only one of the N blocks, block BKH, change between the corresponding sets CSET(j) and CSET(j+1) such that BKH(j)≠

BKH(j+1), thereby establishing how the block BKH hops between CSET(j) and CSET(j+1).

14. The method of claim 11, wherein the interpreting a frequency-block hopping guide includes:

retrieving a frequency-block hopping specification from a memory;

generating a frequency-block hopping schedule according to the frequency-block hopping specification and the identification IDCN of the gateway; and

indexing the frame number FN(i) into the frequency-block hopping schedule to yield therefrom the corresponding set CSET(i).

15. The method of claim 14, wherein:

generating a frequency-block hopping map based on the frequency-block hopping specification and the identification IDCN of the gateway; and

generating the frequency-block hopping schedule based on the frequency-block hopping map.

16. The method of claim 14, wherein the generating the frequency-block hopping schedule includes:

organizing the L instances of sets CSET of channels into a data structure that identifies, for each of the L instances of frame number FN, the N*P channels in the corresponding instance of set CSET, respectively, with the data structure being the frequency-block hopping schedule.

17. A system for identifying the location of one or more objects to be located in real time, the system comprising:

an object to be located, from among the objects to be located in real time, including a short range radio frequency signal transmitter for transmitting a signal with unique information that is associated with, and thereby identifies, the object using a first wireless communications protocol;

a collector within a short range radio frequency signal range of the object, the collector including a signal receiver for receiving the signal with unique information that is associated with, and thereby identifies, the object using the first wireless communications protocol, the collector further including a transmitter for transmitting the signal including the unique information that is associated with the object using a second wireless communication protocol via a low power wide area network;

a gateway in wireless communication with the collector via the low power wide area network, the gateway including a receiver for receiving the signal with information including the unique information that is associated with the object from the collector;

a processing application for processing the information, including determining the association between the unique information and the object thereby identified, and creating an information processing outcome; and

an end user terminal having an interface for displaying the information processing outcome,

wherein the gateway is configured to communicate with one or more of the processing application and the end user terminal so as to establish selective identification and location determination, by one or more of the processing application and the end user terminal and from among the objects to be located in real time, of the object transmitting the signal with the unique information.

18. The system of claim 17, wherein the object is a hospital bed located in a hospital.

19. The system of claim 17, wherein the object is a human laborer located in an agricultural field.

20. The system of claim 17, wherein the object is a human laborer located at a construction site.

21. The system of claim 17, wherein the collector is battery powered.

22. A system for transmitting information using two different wireless communication protocols, the system comprising:

an object to be located, from among a plurality of objects, including a short range radio frequency signal transmitter for transmitting a signal using a first wireless communications protocol, the signal including information transmitted from the object;

a collector within a short range radio frequency signal range of the object, the collector including a signal receiver for receiving the signal transmitted by the short range radio frequency transmitter using the first wireless communications protocol, the collector further including a collector transmitter that transmits a collector signal using a second wireless communication protocol via a low power wide area network, the collector signal including the information transmitted from the object;

a gateway in wireless communication with the collector via the low power wide area network, the gateway including a gateway receiver for receiving the collector signal;

a processing application for processing the information transmitted from the object and creating an information processing outcome; and

an end user terminal having an interface for displaying the information processing outcome,

wherein the gateway is configured to communicate with one or more of the processing application and the end user terminal so as to establish selective identification and location determination, by one or more of the processing application and the end user terminal and from among the plurality of objects, of the object transmitting the signal including the information transmitted from the object.

23. The system of claim 22, wherein the object is a temperature sensor and the information transmitted from the object is a sensed temperature.

24. The system of claim 22, wherein the object is utility meter and the information transmitted from the object includes a utility usage volume.

25. The system of claim 24, wherein the utility is selected from the list comprising:

water, gas and electricity.

26. The system of claim 22, wherein the object is a sensor that senses the presence of a condition and the information transmitted from the object includes a state with respect to the presence of the condition.

27. The system of claim 26, wherein the condition is selected from a list comprising:

a door being opened, a door being locked, and a toxic gas being present in a predetermined concentration level.

28. The system of claim 22, wherein the object is a consumable dispenser and the information transmitted from the object is selected from a list consisting of:

an amount of a consumable dispensed by the dispenser, a time during which dispensing of the consumable occurred, and a time when the dispenser is opened and the consumable is changed or replaced.

29. The system of claim 28, wherein the consumable is selected from the list comprising:

paper towels and liquid soap.