OPPORTUNISTIC DATA TRANSFER BETWEEN VEHICLES

• US 20110205943A1
• Filed: 02/25/2010
• Published: 08/25/2011
• Est. Priority Date: 02/25/2010
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Grimm, Donald K., Bai, Fan
• Granted Patent: US 8,300,564 B2
• Time in Patent Office: Days
• US Class Current: 370/310
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A system and method for optimizing wireless vehicle to vehicle communications is configured to maximize the amount of data that can be transferred from one vehicle to another during a transient encounter by adaptively adjusting the message packet size and data modulation rate during an inter-vehicle communication session.

Claims

1. A method for optimizing data transferred between vehicles, said method comprising:

determining if there are missed packets in a sequence of status messages transmitted between two vehicles;

determining if a number of successful packet transfers is greater than or equal to a successful packets threshold and if a received signal strength indication is increasing, if there are no missed packets in the sequence of messages;

determining if a number of missed packet transfers is greater than or equal to a missed packets threshold and if a received signal strength indication is decreasing, if there are missed packets in the sequence of messages;

increasing a length of a message packet by a predetermined packet increase amount if the number of successful packet transfers is greater than or equal to the successful packets threshold and if the received signal strength indication is increasing; and

decreasing the length of the message packet by a predetermined packet decrease amount if the number of missed packet transfers is greater than or equal to the successful packets threshold and if the received signal strength indication is decreasing.

2. The method according to claim 1 further comprising incrementing the number of successful packet transfers if there are no missed packets in the sequence of messages.

3. The method according to claim 1 further comprising resetting the number of missed packet transfers and the number of successful packet transfers determining if packet setting changed.

4. The method according to claim 1 further including determining if the number of successful packet transfers is greater than or equal to a data rate success threshold and if the received signal strength indication is increasing, if there are no missed packets in the sequence of messages.

5. The method according to claim 4 further including increasing a packet transfer data rate by a predetermined data rate unit if the number of successful packet transfers is greater than or equal to the data rate success threshold and if the received signal strength indication is increasing.

6. The method according to claim 1 further including determining if the number of missed packet transfers is greater than or equal to a data rate success threshold and if the received signal strength indication is decreasing, if there are missed packets in the sequence of messages.

7. The method according to claim 6 further including decreasing the packet transfer data rate by a predetermined data rate unit if the number of missed packet transfers is greater than or equal to the data rate success threshold and if the received signal strength indication is decreasing.

8. A method for optimizing data transferred between vehicles, said method comprising:

determining if there are missed packets in a sequence of status messages transmitted between two vehicles;

determining if a number of successful packet transfers is greater than or equal to a data rate success threshold and if the received signal strength indication is increasing, if there are no missed packets in the sequence of messages;

determining if a number of missed packet transfers is greater than or equal to the data rate success threshold and if a received signal strength indication is decreasing, if there are missed packets in the sequence of messages;

increasing a packet transfer data rate by a predetermined data rate unit if the number of successful packet transfers is greater than or equal to the data rate success threshold and if the received signal strength indication is increasing; and

decreasing the packet transfer data rate by a predetermined data rate unit if the number of missed packet transfers is greater than or equal to the data rate success threshold and if the received signal strength indication is decreasing.

9. The method according to claim 8 further comprising incrementing the number of successful packet transfers if there are no missed packets in the sequence of messages.

10. The method according to claim 8 further comprising resetting the number of missed packet transfers and the number of successful packet transfers if packet setting changed.

11. A system having computer-readable medium tangibly embodying computer-executable instructions for:

determining if there are missed packets in a sequence of status messages transmitted between two vehicles;

determining if a number of successful packet transfers is greater than or equal to a successful packets threshold and if a received signal strength indication is increasing, if there are no missed packets in the sequence of messages;

determining if a number of missed packet transfers is greater than or equal to a missed packets threshold and if a received signal strength indication is decreasing, if there are missed packets in the sequence of messages;

increasing a length of a message packet by a predetermined packet increase amount if the number of successful packet transfers is greater than or equal to the successful packets threshold and if the received signal strength indication is increasing; and

decreasing the length of the message packet by a predetermined packet decrease amount if the number of missed packet transfers is greater than or equal to the successful packets threshold and if the received signal strength indication is decreasing.

12. The method according to claim 11 further comprising incrementing the number of successful packet transfers if there are no missed packets in the sequence of messages.

13. The method according to claim 11 further comprising resetting the number of missed packet transfers and the number of successful packet transfers determining if packet setting changed.

14. The method according to claim 11 further including determining if the number of successful packet transfers is greater than or equal to a data rate success threshold and if the received signal strength indication is increasing, if there are no missed packets in the sequence of messages.

15. The method according to claim 14 further including increasing a packet transfer data rate by a predetermined data rate unit if the number of successful packet transfers is greater than or equal to the data rate success threshold and if the received signal strength indication is increasing.

16. The method according to claim 11 further including determining if the number of missed packet transfers is greater than or equal to a data rate success threshold and if the received signal strength indication is decreasing, if there are missed packets in the sequence of messages.

17. The method according to claim 16 further including decreasing the packet transfer data rate by a predetermined data rate unit if the number of missed packet transfers is greater than or equal to the data rate success threshold and if the received signal strength indication is decreasing.