Wireless architecture utilizing geo-referencing

• US 8,160,574 B1
• Filed: 12/22/2006
• Issued: 04/17/2012
• Est. Priority Date: 06/17/2005
• Status: Expired due to Fees

• Current Assignee: Fisher-Rosemount Systems Incorporated (Emerson Electric Company)
• Original Assignee: Fisher-Rosemount Systems Incorporated (Emerson Electric Company)
• Inventors: Nelson, Joe
• Primary Examiner(s): Karikari, Kwasi
• Application Number:
  US11/644,758
• Publication Number:
  US 20120076007A1
• Time in Patent Office: 1,943 Days
• Field of Search: 455/404.2, 455/426.2, 455/456.1, 455/453, 455/501, 455/522, 455/62, 455/63.1, 455/67.11, 455/115.1, 455/69, 455/446, 455/445, 455/517, 455/67.1, 455/67.4, 455/449, 455/524, 455/456, 340/517, 340/521, 340/539.22, 340/539.29
• US Class Current: 455/426.2
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

A wireless communication system for use in a process control environment includes a reference node adapted to determine geographic positions of at least some of the reference node, a base node, and a field node and determine RF power settings of transceivers attached to the reference node, the base node, and the field node based on the position of determined geographic positions. Additionally, the reference node is adapted to determine RF noise level at a plurality of locations within the process control environment at a plurality of times and to adjust the RF power settings based on the determined RF noise levels. The reference node may be implemented on a hand-held device.

Claims

1. A wireless communication network, comprising:

a base node, a field node, a reference node and a host;

the base node communicatively coupled to the host;

the base, field and reference nodes each comprising a wireless conversion unit and a wireless transceiver;

the wireless transceivers of the base, the field and the reference nodes effecting wireless communications amongst the base, field and reference nodes;

the field node comprising at least one field device providing process control data;

the reference node comprising a geographical positioning apparatus to determine geographical position of the reference node;

an RF noise measurement apparatus located on at least one of the base, field and reference nodes, wherein the RF noise measurement apparatus is to determine RF ambient noise levels at the RF noise measurement apparatus over a predetermined time period; and

a power settings apparatus located on at least one of the base and reference nodes, wherein the power setting apparatus is to

determine the geographic position of each of the base and field nodes relative to the reference node, and

determine RF power settings of the wireless transceivers of at least one of the base, the field and the reference nodes using the geographic position of the at least one of the base and field nodes and using the RF ambient noise levels determined by the RF noise measurement apparatus.

2. The wireless communication network of claim 1, wherein the reference node is implemented using a handheld device.

3. The wireless communication network of claim 1, wherein the RF noise measurement apparatus is further to generate an RF ambient noise predictive function predicting the RF ambient noise level as a function of at least one of:

(1) time of day, (2) day of week, and (3) day of month.

4. The wireless communication network of claim 3, wherein the power settings apparatus is further to adjust RF power settings of the wireless transceivers of at least one of the base, the field and the reference nodes using the RF ambient noise predictive function.

5. The wireless communication network of claim 1, wherein:

the RF noise measurement apparatus is to measure RF ambient noise levels at a plurality of locations of the reference node;

the power setting apparatus is to measure and record the distance of the reference node at each of the plurality of locations from at least one of the base and field nodes; and

the power setting apparatus determines an optimal location for the reference node based on the RF ambient noise levels at the plurality of locations and distance between the reference node at each of the plurality of locations and at least one of the base and field nodes.

6. The wireless communication network of claim 5, wherein the power setting apparatus is further to determine geographic location of at least one of the base and field nodes based on the RF ambient noise levels at the plurality of locations and the distance between the reference node at each of the plurality of locations and the at least one of the base and field nodes.

7. The wireless communication network of claim 1 further comprising a repeater node comprising a wireless conversion unit and a wireless transceiver, the repeater node effecting wireless communications amongst the base, field and environmental nodes.

8. The wireless communication network of claim 1 wherein the reference node further comprises a plurality of sensor devices, each of the plurality of sensor devices providing data selected from a group consisting of temperature, barometric pressure, humidity, rainfall and radio frequency ambient noise.

9. The wireless communication network of claim 1 wherein the at least one field device of the field node comprises at least one of a HART protocol device and a Fieldbus™

protocol device.

10. The wireless communication network of claim 1 further comprising a plurality of environmental nodes strategically placed about a process area for communicating environmental data for different locations within the process area.

11. The wireless communication network of claim 1 wherein the base, environmental and field nodes form at least one of a mesh communications network and a point-to-point communications network.

12. The wireless communication network of claim 11, wherein the power setting apparatus is further to determine a network configuration based on the RF ambient noise levels at a plurality of locations and the distance of the reference node at each of the plurality of locations from at least one of the base and field nodes.

13. The wireless communication network of claim 12, further comprising a switch device to convert the base, environmental and field nodes from a mesh communications network to a point-to-point communications network and vice versa.

14. The wireless communication network of claim 1, wherein the host comprises a monitor, the host being programmed to provide a topology screen display on the monitor illustrating wireless communications between each of the base, field and reference nodes of the network.

15. The wireless communication network of claim 14, wherein the topology screen display also illustrates structural features of a process area in which the base, field and environmental nodes are disposed.

16. The wireless communication network of claim 14, wherein the topology screen display also illustrates strength of RF reception at some of the base node, the reference node and the field node.

17. The wireless communication network of claim 1, wherein the host comprises a monitor, the host being programmed to provide a tabular screen display on the monitor listing a hop count between each of the field and environmental nodes and the base node of the network.

18. The wireless communication network of claim 1, wherein the power settings apparatus is to adjust a routing table of the base, the field and the reference nodes using the RF ambient noise levels.

19. A method for monitoring a wireless process control network, the method comprising:

receiving a geographic position data from a reference node;

receiving data indicative of a radio frequency (RF) ambient noise level from one or more environmental field devices of the reference node;

wirelessly transmitting the data indicative of the RF ambient noise level and the geographic position data to a base node communicatively attached to a host;

interpreting the data indicative of the RF ambient noise level and the geographic position data at the host,

sending a command from the host to the base node to adjust at least one operating parameter of the wireless network based on the data indicative of the RF ambient noise level and the geographic position data, and

wirelessly transmitting the command from the base node to at least one field node attached to a field device.

20. The method of claim 19, further comprising receiving, from the one or more environmental field devices, data selected from a group consisting of temperature, barometric pressure, humidity, and rainfall.

21. The method of claim 20, wherein the geographic position data further includes geographic position of at least one of the base node, the reference node and the field node.

22. The method of claim 21, wherein the data indicative of the RF ambient noise level includes data indicative of RF ambient noise levels at the reference node over a pre-determined period of time.

23. The method of claim 19, wherein the operating parameter is an RF power setting for each of the at least one field node.

24. The method of claim 19, wherein the operating parameter is a routing table for the wireless network.