DIVERSITY ANTENNA HOUSING

• US 20140086286A1
• Filed: 09/27/2012
• Published: 03/27/2014
• Est. Priority Date: 09/27/2012
• Status: Abandoned Application

• Current Assignee: Rosemount Incorporated (Emerson Electric Company)
• Original Assignee: Rosemount Incorporated (Emerson Electric Company)
• Inventors: Morrison, Brett Robert, McGuire, Chad Michael, Carlson, Daniel Clifford
• Application Number:
  US13/628,516
• Publication Number:
  US 20140086286A1
• Time in Patent Office: Days
• US Class Current: 375/219
• CPC Class Codes: H04B 7/0608 Antenna selection according to transmission parameters
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04B 7/0814 based on current reception conditions, e.g. switching to different antenna when signal level is below threshold

Abstract

A wireless device comprises a plurality of diverse antennas, an accelerometer configured to determine an orientation of the wireless device, and a processor. The processor is configured to initially select a primary link configuration based on the determined orientation of the wireless device. The primary link configuration designates one or more of the plurality of diverse antennas and one or more diverse antennas of another wireless device configured to transmit the payload messages. The processor is further configured to receive payload messages using the primary link configuration, record a received signal strength indication (RSSI) value for the received payload messages, and periodically test RSSI for alternative link configurations. The processor compares RSSI between the primary link configuration and the alternative link configuration, and revises the primary link configuration if the comparison indicates that the alternative link configuration RSSI is greater than primary link configuration RSSI.

Claims

1. A wireless device comprising:

a plurality of diverse antennas;

an accelerometer configured to provide a signal from which orientation of the wireless device can be determined; and

a processor configured to;

initially select a primary link configuration based on the determined orientation of the wireless device, the primary link configuration designating one or more of the plurality of diverse antennas and one or more antennas of another wireless device configured to transmit the payload messages;

receive payload messages using the primary link configuration, and record a received signal strength indication (RSSI) value for the received payload messages;

periodically test RSSI for alternative link configurations;

compare RSSI between the primary link configuration and the alternative link configuration; and

revise the primary link configuration when the comparison indicates that the alternative link configuration RSSI is greater than primary link configuration RSSI.

2. The wireless device of claim 1, wherein the primary link configuration and the alternative link conditions each designate one or more of the plurality of diverse antennas and one or more of a second plurality of diverse antennas of the other wireless device.

3. The wireless device of claim 1, wherein the processor periodically tests every possible alternative link configuration by exercising each link configuration with a data packet.

4. The wireless device of claim 1, wherein periodically testing alternative link configurations comprises transmitting periodic test packets using the alternative link configurations.

5. The wireless device of claim 1, wherein periodically testing alternative link configurations comprises transmitting payload messages using the primary link configuration, and redundantly transmitting a subset of the payload messages using the alternative link configuration.

6. The wireless device of claim 1, wherein periodically testing alternative link configurations comprises periodically transmitting payload message using the alternative link configuration, rather than the primary link configuration.

7. The wireless device of claim 1, wherein the plurality of antennas are formed on a circuit board.

8. The wireless device of claim 1, wherein the processor is further configured to:

record packet loss rate for the received payload messages;

periodically test packet loss rate for alternative link configurations;

compare packet loss rate between the primary link configuration and the alternative link configuration; and

revise the primary link configuration when the comparison indicates that the alternative link configuration packet loss rate is less than the primary link configuration packet loss rate.

9. The wireless device of claim 1, wherein the processor is configured to revise the primary link configuration only when the comparison indicates that the alternative link configuration RSSI exceeds the primary link configuration RSSI by at least a specified amount.

10. A wireless network comprises:

a first wireless device having a printed wiring board with at least one first antenna; and

a second wireless device having an accelerometer configured to provide a signal from which orientation of the wireless device can be determined, a printed wiring board with a plurality of second antennas with diverse orientations, and a processor configured to;

transmit and receive payload messages between the first wireless device and the second wireless device using a link configuration designating one or more of the first antennas and one or more the second antennas;

initially select a primary link configuration using the determined orientation of the second wireless device;

periodically test an alternative link configuration;

compare received signal parameters between the primary link configuration and the alternative link configuration; and

revise the primary link configuration whenever the comparison indicates that the alternative link configuration is superior to the primary link configuration.

11. The wireless network of claim 10, wherein the first wireless device comprises a plurality of first antennas with diverse orientations.

12. The wireless network of claim 10, wherein comparing received signal parameters comprises comparing received signal strength between the primary link configuration and the alternative link configuration, and wherein the primary link configuration is revised whenever the comparison indicates that the alternative link configuration signal strength exceeds the primary link configuration signal strength.

13. The wireless network of claim 12, wherein the processor is configured to revise the primary link configuration only when the comparison indicates that the alternative link configuration RSSI exceeds the primary link configuration RSSI by at least a specified amount.

14. The wireless network of claim 10, wherein comparing received signal parameters comprises comparing received packet error rate between the primary link configuration and the alternative link configuration, and wherein the primary link configuration is revised whenever the comparison indicates that the primary link configuration packet error rate exceeds the alternative link configuration packet error rate.

15. The wireless network of claim 10, wherein comparing received signal parameters comprises comparing received noise levels between the primary link configuration and the alternative link configuration, and wherein the primary link configuration is revised whenever the comparison indicates that the primary link configuration noise level exceeds the alternative link configuration noise level.

16. The wireless network of claim 10, wherein the processor is configured to periodically enter a test cycle wherein it requests and receive at least one test packet from the first wireless device using each possible alternative link configuration.

17. The wireless network of claim 10, wherein the processor is configured to periodically request and receive a single test message using an alternative link configuration that differs from each single test message to the next.

18. The wireless network of claim 17, wherein the single test message is a test packet.

19. The wireless network of claim 17, wherein the single test message is one of the payload messages.

20. A method for selecting a link configuration designating at least one antenna of a first wireless device and at least one antenna of a second wireless device, the method comprising:

initially selecting a reception antenna of the first wireless device based on an orientation of a first wireless device ascertained using an accelerometer;

receiving payload messages from the second wireless device at the second wireless device using a primary link configuration;

periodically testing one or more alternative link configurations;

comparing a received signal strength indication (RSSI) at the first wireless device between the primary link configuration and the alternative link configuration; and

revising the primary link configuration whenever the comparison indicates that alternative link configuration RSSI exceeds primary link configuration RSSI.

21. The method of claim 20, wherein the each of the primary link configuration and the alternative link configurations designates at least one of a first plurality of diverse antennas of the first wireless device, and at least one of a second plurality of diverse antennas of the second wireless device.

22. The method of claim 20, wherein the primary link configuration is only revised if the comparison indicates that the alternative link configuration RSSI exceeds the alternative link condition RSSI by at least a specified amount.

23. The method of claim 20, wherein periodically testing one or more alternative link configurations comprises periodically entering a test cycle wherein all possible alternative link configurations are tested.

24. The method of claim 20, wherein periodically testing one or more alternative link configurations comprises periodically testing a single alternative link configuration which differs from one periodic test to the next.

26. The industrial process field device of claim 22, wherein the plurality of diverse antennas are printed on a circuit board in the casing.

25. An industrial process field device comprising:

a casing configured to be mounted in a stationary position;

a transducer housed in the casing and configured to interact with an industrial process;

a plurality of diverse antennas;

an accelerometer configured to provide a signal from which orientation of the casing can be determined; and

a processor configured to;

transmit payload messages using a link configuration designating one or more of the plurality of diverse antennas, and one or more antennas of another wireless device configured to receive the payload messages;

initially select a primary link configuration using the determined orientation of the casing;

periodically test an alternative link configuration;

compare packet error rate and received signal strength between the primary link configuration and the alternative link configuration; and

revise the primary link configuration whenever the comparison indicates that the alternative link configuration is superior to the primary link configuration.

27. The industrial process field device of claim 25, wherein the primary link configuration and the alternative link conditions each designate one or more of the plurality of diverse antennas and one or more of a second plurality of diverse antennas of the other wireless device.