Measurements exchange network, such as for internet-of-things (IoT) devices
Measurement exchange networks and protocols to exchange measurements of a parameter amongst devices (e.g., IoT devices), select the best measurement(s), accuracy/precision-wise, and determine a process variable for a control system based on the selected best measurement(s). A device may select a peer-provided best measurement to output as the process variable in place of a local measurement, and/or compute the process variable from multiple best measurements (e.g., local and/or peer-provided measurements). Metadata may be used to select a measurement(s) and/or to increase reliability/trust of exchanged data. In this way, each device of an exchange group/network may obtain the highest measurement accuracy of all available collocated sensors with little or no additional processing or cloud connectivity. A best measurement(s) may be selected based on measurement quality specifications extracted from metadata, measurement qualities computed from measurements of respective sensors, locations/proximities of the sensors, a policy(ies), and/or device IDs (e.g., extracted from metadata).
1. An apparatus, comprising, a controller configured to:
receive a first measurement of a parameter from a first sensor associated with the controller;
transmit the first measurement over a communication network;
receive one or more additional measurements of the parameter from one or more additional sensors over the communication network;
select one or more of the measurements of the parameter based on one or more of specifications of the respective sensors and measures of quality computed from measurements of the respective sensors; and
determine a value of the parameter from the one or more selected measurements.
2. The apparatus of claim 1 , wherein the controller is further configured to:
extract specifications of the one or more additional sensors from metadata of the respective one or more additional measurements; and
select the one or more measurements of the parameter based on the extracted specifications of the one or more additional sensors and a corresponding specification of the first sensor.
3. The apparatus of claim 2 , wherein the controller is further configured to:
extract a device identifier of each of the one or more additional sensors from the respective metadata; and
select the one or more measurements of the parameter based on the extracted device identifier of the one or more additional sensors.
4. The apparatus of claim 2 , wherein the controller is further configured to:
extract a measurement quality specification of each of the one or more additional sensors from the respective metadata; and
select the one or more measurements of the parameter based on a comparison of the extracted measurement quality specifications of the one or more additional sensors and a corresponding measurement quality specification of the first sensor.
5. The apparatus of claim 4 , wherein the extracted measurement quality specification relates to one or more of measurement precision, measurement accuracy, and measurement frequency.
6. The apparatus of claim 1 , wherein the controller is further configured to:
determine a proximity of each of the one or more additional sensors relative to the first sensor; and
select the one or more measurements of the parameter based on the proximity of each of the one or more additional sensors.
7. The apparatus of claim 1 , wherein the controller is further configured to:
select a highest quality one of measurements of the parameter as the determined value of the parameter.
8. The apparatus of claim 1 , wherein the controller is further configured to:
select multiple measurements of the parameter based on measures of quality of the respective measurements; and
compute the determined value of the parameter from the multiple measurements.
9. The apparatus of claim 1 , wherein the controller is further configured to:
receive measurements of multiple parameters over the communication network; and
identify the one or more additional measurements of the parameter from amongst the measurements of multiple parameters based on metadata associated with the respective measurements.
10. The apparatus of claim 1 , wherein the controller is further configured to:
format the first measurement of the parameter as one or more datagrams;
broadcast the one or more datagrams over the communication network;
listen for datagrams broadcast over the communication network by one or more other controllers;
extract the one or more additional measurements of the parameter, and specifications of the one or more additional sensors, from the datagrams broadcast over the communication network by the one or more other controllers; and
select the one or more measurements of the parameter based on the extracted specifications of the one or more additional sensors and a corresponding specification of the first sensor.
11. The apparatus of claim 1 , wherein the controller is further configured to:
authenticate each of the one or more additional measurements based on metadata of the respective measurement.
12. The apparatus of claim 1 , wherein the controller is further configured to:
authenticate each of the one or more additional measurements based on metadata of the respective one or more additional measurements in an access-protected region of memory;
select the one or more of measurements of the parameter within the access-protected region of memory; and
determine the value of the parameter within the access-protected region of memory.
13. A non-transitory computer readable medium encoded with a computer program that includes instructions to cause a controller to:
receive a first measurement of a parameter from a first sensor associated with the controller;
transmit the first measurement over a communication network;
receive one or more additional measurements of the parameter from one or more additional sensors over the communication network;
select one or more of the measurements of the parameter based on one or more of specifications of the respective sensors and measures of quality computed from measurements of the respective sensors; and
determine a value of the parameter from the one or more selected measurements.
14. The non-transitory computer readable medium of claim 13 , further including instructions to cause the controller to:
extract specifications of the one or more additional sensors from metadata of the respective one or more additional measurements; and
select the one or more measurements of the parameter based on a specification of the first sensor and the extracted specifications of the one or more additional sensors.
15. The non-transitory computer readable medium of claim 13 , further including instructions to cause the controller to:
select a highest quality one of measurements of the parameter as the determined value of the parameter.
16. The non-transitory computer readable medium of claim 13 , further including instructions to cause the controller to:
select multiple measurements of the parameter based on measures of quality of the respective measurements; and
compute the determined value of the parameter from the multiple measurements.
17. A method, comprising:
receiving a first measurement of a parameter from a first sensor associated with a controller;
transmitting the first measurement over a communication network;
receiving one or more additional measurements of the parameter from one or more additional sensors over the communication network;
selecting one or more of the measurements of the parameter based on one or more of specifications of the respective sensors and measures of quality computed from measurements of the respective sensors; and
determining a value of the parameter from the one or more selected measurements.
18. The method of claim 17 , further including:
extracting specifications of the one or more additional sensors from metadata of the respective one or more additional measurements;
wherein the selecting includes selecting the one or more measurements of the parameter based on a specification of the first sensor and the extracted specifications of the one or more additional sensors.
19. The method of claim 17 , wherein the selecting includes:
selecting a highest quality one of measurements of the parameter as the determined value of the parameter.
20. The method of claim 17 , wherein:
the selecting includes selecting multiple measurements of the parameter based on measures of quality of the respective measurements; and
the determining includes computing the value of the parameter from the multiple measurements.