Message management protocol persistent geocast routing
First Claim
1. A method for providing a warning message to a group of vehicles, said method comprising:
- detecting a hazardous situation by a detecting vehicle;
broadcasting a warning message from the detecting vehicle;
broadcasting the message by other vehicles until the message is received by all of the vehicles in a region of interest even if the detecting vehicle has left the region of interest;
preventing the warning message from being broadcast for a first predetermined period of time after the vehicles in the region of the interest have received the message;
selecting a host vehicle to re-broadcast the message after the first predetermined period of time has expired;
preventing the message from being broadcast again for the first predetermined period of time;
repeating the step of determining a host vehicle for re-broadcasting the message; and
ending the broadcast of the message after a second predetermined period of time has expired.
12 Assignments
0 Petitions
Accused Products
Abstract
A system and method for providing a protocol to maintain a persistent warning message in a region of interest. The protocol begins its operation when a hazardous condition is detected by a vehicle. The detecting vehicle uses a multi-hop geocast broadcasting process to transmit a warning message to other vehicles in the region of interest. When the vehicles in the region of interest receive the warning message, they are prevented from re-broadcasting the message for a first predetermined period of time. After the first predetermined period of time has expired, a contentious timing process is used to determine which of those vehicles will re-broadcast the message to other vehicles entering the region of interest. This process of re-broadcasting continues until a second predetermined period of time expires at which time the message is not re-broadcast.
30 Citations
20 Claims
-
1. A method for providing a warning message to a group of vehicles, said method comprising:
-
detecting a hazardous situation by a detecting vehicle; broadcasting a warning message from the detecting vehicle; broadcasting the message by other vehicles until the message is received by all of the vehicles in a region of interest even if the detecting vehicle has left the region of interest; preventing the warning message from being broadcast for a first predetermined period of time after the vehicles in the region of the interest have received the message; selecting a host vehicle to re-broadcast the message after the first predetermined period of time has expired; preventing the message from being broadcast again for the first predetermined period of time; repeating the step of determining a host vehicle for re-broadcasting the message; and ending the broadcast of the message after a second predetermined period of time has expired. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method for providing a warning message of a hazardous road condition to a group of vehicles, said method comprising:
-
detecting the hazardous road condition by a detecting vehicle; defining a region of interest along a roadway from a position just in front of the hazardous condition to a predetermined distance behind the hazardous condition; defining a critical line behind the hazardous road condition; defining a distance from the critical line to a back end of the region of interest; broadcasting a warning message from the detecting vehicle to other vehicles in the region of interest using a multi-hop geocast transmission scheme; preventing the warning message from being broadcast for a first predetermined period of time after the vehicles in the region of interest have received the message; and using a contentious timing process to determine which of the vehicles that have received the message in the region of interest will re-broadcast the message to new vehicles entering the region of interest after the first predetermined period of time even if the detecting vehicle has left the region of interest. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A method for providing a warning message to a group of vehicles, said method comprising:
-
detecting a hazardous situation by a detecting vehicle; broadcasting a warning message from the detecting vehicle to be received by other vehicles even if the detecting vehicle has left the region of interest; providing a process by which the message is re-broadcast to a new set of vehicles after a predetermined period of time; and providing a process by which the message is not further re-broadcast after an event lifetime has expired. - View Dependent Claims (18, 19, 20)
-
Specification