System and method of vehicular wireless communication using a group manager

• US 7,983,841 B2
• Filed: 11/08/2005
• Issued: 07/19/2011
• Est. Priority Date: 11/08/2004
• Status: Expired due to Fees

• Current Assignee: Toyota Motor Corporation, Regents of the University of California (University of California)
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation), University of California Berkeley (University of California)
• Inventors: Sengupta, Raja, Laberteaux, Kenneth P., Mak, Tony K.
• Primary Examiner(s): ARTHUR JEANGLAUDE, GERTRUDE
• Application Number:
  US11/718,868
• Publication Number:
  US 20090138197A1
• Time in Patent Office: 2,079 Days
• Field of Search: 701/33, 701/36, 701/66, 701/213, 455/41.2, 455/515, 455/511, 455/555, 342/357.09, 342/357.1, 340/995.13, 340/426.16
• US Class Current: 701/213
• CPC Class Codes: G08G 1/096716 where the received information does not generate an automatic action on the vehicle control
• CPC Class Codes: G08G 1/096783 where the origin of the information is a roadside individual element
• CPC Class Codes: H04W 74/02 Hybrid access

Abstract

A system and method of vehicular wireless communication over a Dedicated Short Range Communication service band is provided. The system includes a vehicle having a navigation means, a processor, and a communication means for transmitting a message via a wireless communications link. The system includes a control channel for communicating a safety message and a service channel for communicating a non-safety message. The control channel is subdivided into a contention-free period having a safety exchange interval and a contention period having a non-safety service interval. The system further includes a dedicated group manager that partitions the vehicles into groups. The method includes the steps of determining if the vehicle is within communications range of the region, determining if the vehicle is registered with the group manager, if the vehicle is within the communications range of the group manager, determining if a current time is within the safety exchange interval, and transmitting the safety communication by each registered vehicle during the safety exchange interval at the predetermined time for each registered vehicle. The method further includes the steps of determining if the safety communication exchange by every registered vehicle is completed, and permitting the vehicle to leave the control channel if the safety communication exchange is complete, and determining if a current time is within a contention period, and transmitting the non-safety communication if the current time is within the contention period.

Claims

1. A method of vehicular wireless communication over a Dedicated Short Range Communication service band using a group manager, said method comprising the steps of:

dividing the service band into a control channel for transmitting a safety communication, and a service channel for transmitting a non-safety communication;

defining a group manager operating on the control channel that transmits and receives messages on the control channel;

subdividing the control channel into intervals of time, wherein one interval is a safety exchange interval during a contention-free period of time and each registered vehicle transmits a safety communication at predetermined time during the safety exchange interval, and the predetermined time is determined by the group manager;

defining a service access point that transmits and receives non-safety communications on the service channel;

assigning a vehicle to a group, by the group manager;

determining if the vehicle is within communications range of the service access point;

determining if the vehicle is registered with the group manager, if the vehicle is within the communications range of the group manager, wherein the group manager maintains a list of registered vehicles, and registering the vehicle with the group manager if not registered;

determining if a current time is within the safety exchange interval in the contention-free period of time in the control channel, and transmitting the safety communication by each registered vehicle during the safety exchange interval at the predetermined time for each registered vehicle, if the current time is within the safety exchange interval of the contention-free period;

determining if the safety communication exchange by every registered vehicle is completed, and permitting the vehicle to leave the control channel if the safety communication exchange is complete; and

determining if a current time is within a contention period, and transmitting the non-safety communication if the current time is within the contention period.

2. A method as set forth in claim 1 further including the step of:

communicating a safety communication on an ad-hoc schedule if the vehicle is not assigned to a group.

3. A method as set forth in claim 1 wherein the safety communication and non-safety communication are transmitted via a broadcast over the Dedicated Short Range Communication service band by a radio.

4. A method as set forth in claim 1 further including the step of determining if the vehicle is leaving the communication range, and removing the vehicle from the list of registered vehicles if the vehicle is leaving the communication range.

5. A method as set forth in claim 1 wherein said step of dividing the control channel into intervals further includes the steps of:

defining a safety exchange interval in the contention-free period;

defining a group management interval and a service announcement interval in the contention period for each group; and

defining a non-safety services interval in the service channel, wherein the service access point provides services on the service channel during the contention period.

6. A method as set forth in claim 5, wherein each group manager provides predetermined instructions to a coordinating service access point that coordinates a predetermined group of service access points.

7. A method as set forth in claim 1 wherein said step of registering the vehicle within the range further includes the steps of:

updating the registered vehicle list by adding the vehicle to the registered vehicle list if determined that the vehicle is entering the region, or removing the vehicle from the registered vehicle list if determined that the vehicle is leaving the region.

8. An system of vehicular wireless communication over a Dedicated Short Range Communication service band of a vehicle using a group manager within a region comprising:

a navigation means on the vehicle that is in communication with a global positioning system which includes a global positioning transceiver associated with the vehicle, and a global positioning signal transmitter in communication with the vehicle global positioning transceiver;

a processor on the vehicle that is in communication with said navigation means;

an input means in communication with said processor;

a user notification device operatively in communication with said navigation means for providing information to a vehicle operator;

a user manual input mechanism operatively in communication with said navigation means transmitting information from the vehicle operator;

a communication means operatively in communication with said navigation means for transmitting a message over a channel on the Dedicated Short Range Communication service band via a wireless communications link, wherein the channel is divided into a control channel for communicating a safety message and a service channel for communicating a non-safety message, and the control channel is further subdivided into a contention-free period having a safety exchange interval, and a contention period having a group management interval and a service announcement interval includes;

a dedicated group manager that partitions a plurality of vehicles into groups;

a group coordinating access point that operates in the contention period of the control channel, and is operatively in communication with the vehicle via said communications link within the group coordinating access point region, wherein the group coordinating access point region is a geographic area containing the group manager and said group manager determines the predetermined time for each registered vehicle on a registration list maintained by the group manager within communications range of the access point to transmit a safety communication during the safety exchange interval.

9. A system as set forth in claim 8 wherein group manager transmits a signal to the access point within the group containing the start and stop time of the next contention-free period.

10. A system as set forth in claim 8 wherein said vehicle transmits the safety message on an ad-hoc basis when the vehicle is not registered with the group manager.

11. A method of vehicular wireless communication over a Dedicated Short Range Communication service band using a group manager, said method comprising the steps of:

dividing the service band into a control channel for transmitting a safety communication, and a service channel for transmitting a non-safety communication;

defining a group manager operating on the control channel that transmits and receives messages on the control channel;

subdividing the control channel into intervals of time, wherein one interval is a safety exchange interval during a contention-free period of time and each registered vehicle transmits a safety communication at predetermined time during the safety exchange interval, and the predetermined time is determined by the group manager;

defining a group management interval and a service announcement interval in a contention period for each group by the group manager;

defining a non-safety services interval in the service channel, wherein the group manager provides services on the service channel during the contention period;

defining a service access point that transmits and receives non-safety communications on the service channel;

assigning a vehicle to a group, by the group manager;

determining if the vehicle is within communications range of the service access point;

determining if the vehicle is registered with the group manager, if the vehicle is within the communications range of the group manager, wherein the group manager maintains a list of registered vehicles, and registering the vehicle with the group manager if not registered;

determining if a current time is within the safety exchange interval in the contention-free period of time in the control channel, and transmitting the safety communication by each registered vehicle during the safety exchange interval at the predetermined time for each registered vehicle, if the current time is within the safety exchange interval of the contention-free period;

determining if the safety communication exchange by every registered vehicle is completed, and permitting the vehicle to leave the control channel if the safety communication exchange is complete; and

determining if a current time is within a contention period, and transmitting the non-safety communication if the current time is within the contention period.

12. A method as set forth in claim 11 further including the step of:

communicating a safety communication on an ad-hoc schedule if the vehicle is not assigned to a group.

13. A method as set forth in claim 11 wherein the safety communication and non-safety communication are transmitted via a broadcast over the Dedicated Short Range Communication service band by a radio.

14. A method as set forth in claim 11 further including the step of determining if the vehicle is leaving the range, and removing the vehicle from the list of registered vehicles if the vehicle is leaving the region.

15. A method as set forth in claim 11, wherein each group manager provides predetermined instructions to a coordinating service access point that coordinates a predetermined group of service access points.

16. A method as set forth in claim 11 wherein said step of registering the vehicle within the range further includes the steps of:

updating the registered vehicle list by adding the vehicle to the registered vehicle list if determined that the vehicle is entering the region, or removing the vehicle from the registered vehicle list if determined that the vehicle is leaving the region.

17. A method of wireless communication between a group manager and a plurality of vehicles comprising the steps of:

a) transmitting a timing signal from the group manager to the vehicles signifying an initiation of a contention free period followed by a contention period,

b) transmitting a polling signal from the group manager to the vehicles during the contention free period,

c) each vehicle receiving said polling signal and transmitting a safety signal only when polled,

d) said vehicles and/or said group manager transmitting service information during said contention period, and

e) iteratively repeating steps a) through d).