Method for data exchange with a mobile asset considering communication link quality

• US 20030091017A1
• Filed: 11/25/2002
• Published: 05/15/2003
• Est. Priority Date: 10/04/1999
• Status: Active Grant

• Current Assignee: GE Global Sourcing LLC (Westinghouse Air Brake Technologies Corporation)
• Original Assignee: General Electric Company
• Inventors: Gary, Robert A., Davenport, David M., Laguer-Diaz, Juan
• Granted Patent: US 7,236,462 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 17/391 Modelling the propagation channel
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 74/06 using polling

Abstract

A method for data exchange with a mobile asset wherein the communication link quality at the location of the mobile asset is measured at the time of the data transfer. The packet size for the data transfer is selected in response to the communication link quality. The current communication link quality measurement may be used alone or in combination with historical communication link quality data for selecting the data packet size. Communication link quality may be determined repeatedly and the packet size reset accordingly in response to changes in the link quality. A difference between the current communication link quality and historical link quality data may trigger appropriate corrective action, such as identifying the source of intentional or unintentional jamming.

Claims

1. A method of data exchange with a mobile asset, the method comprising:

determining communication link quality at a location of a mobile asset; and

selecting a packet size for data transfer with the mobile asset in response to the communication link quality.

2. The method of claim 1, further comprising resetting the packet size for the data transfer following completion of a portion of the data transfer.

3. The method of claim 1, further comprising:

repeatedly determining communication link quality at respective locations of the mobile asset at it moves along a route; and

resetting the packet size for the data transfer in response to a determined change in the communication link quality from a first location to a second location along the route.

4. The method of claim 1, further comprising:

determining a location of the mobile asset;

predicting communication link quality at the location based upon an existing communication link quality database; and

selecting the packet size for the data transfer in response to the predicted communication link quality and the determined communication link quality.

5. The method of claim 1, further comprising:

predicting communication link quality associated with a plurality of geographic segments; and

selecting the packet size for the data transfer in response to the determined communication link quality at the location of the mobile asset, a predicted communication link quality for a geographic segment in which the mobile asset is located, and a predicted communication link quality for a geographic segment into which the mobile asset will move during the data transfer.

6. The method of claim 1, further comprising:

determining communication link quality associated with a plurality of geographic segments;

utilizing the selected packet size for the transfer of a first portion of data; and

resetting the packet size for the transfer of a second portion of the data in response to a predicted change in communication link quality resulting from the mobile asset moving from a first geographic segment to a second geographic segment during the data transfer.

7. The method of claim 1, further comprising scheduling the polling of a plurality of mobile assets in response to the determined communication link quality.

8. The method of claim 1, further comprising:

predicting communication link quality for the location of the mobile asset based upon an established communication link quality map; and

biasing the packet size selection in response to a comparison of the determined communication link quality and the predicted communication link quality for the location of the mobile asset.

9. The method of claim 1, further comprising revising a database containing historical communications link quality data in response to the determined communication link quality.

10. A method of data exchange with a mobile asset, the method comprising:

establishing a database correlating historical communication link quality data and location data;

determining current communication link quality data for a location; and

comparing the current communication link quality data with data in the database.

11. The method of claim 10, further comprising:

comparing the current communication link quality data with historical communication link quality data for the location to determine a difference; and

implementing an action responsive to the difference.

12. The method of claim 11, further comprising updating the database if the difference exceeds a predetermined value.

13. The method of claim 11, further comprising performing a site investigation if the difference exceeds a predetermined value.

14. The method of claim 10, further comprising adding the current communication link quality data to the database if no historical communication link quality data is correlated in the database with the location.

15. A method of data exchange with a mobile asset, the method comprising:

obtaining communication link quality data and corresponding location data at a plurality of locations of a mobile asset as the mobile asset traverses a route; and

collecting the communication link quality data and corresponding location data to define a communication link quality database.

16. The method of claim 15, further comprising:

obtaining a plurality of types of communication link quality data for a plurality of locations along the route; and

grouping like types of the communication link quality data and corresponding location data to define a plurality of communication link quality databases.

17. The method of claim 15, further comprising:

dividing the route into segments having communication link quality data that is within a predetermined range within each segment;

identifying a representative value for the communication link quality range within each segment; and

creating a map correlating each segment with its respective representative value.

18. The method of claim 15, further comprising:

determining current communication link quality data at a location along the route at a time of a data transfer event; and

using the current communication link quality data to update the database.

19. The method of claim 15, further comprising selecting a packet size for a data transfer event in response to communication link quality data in the database for a location of the data transfer.

20. The method of claim 16, further comprising selecting a type of data transfer in response to communication link quality data in the plurality the databases for a location of the data transfer.