ACCESS POINT IN GEOGRAPHIC ROUTING SYSTEM AND CONTROLLING METHOD THEREOF
First Claim
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1. A controlling method of an access point in a geographic routing system, comprising:
- receiving a traffic event packet by the access point; and
setting a back-off timer of the access point to be a first back-off time value, wherein the first back-off time value is less than a second back-off time value of any on board unit (OBU) which receives the traffic event packet; and
broadcasting the traffic event packet by the access point when the back-off timer is counted down to be zero.
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Abstract
An access point in a geographic routing system and a controlling method thereof are provided. The controlling method of the access point in the geographic routing includes the following steps. A traffic event packet is received by the access point. A back-off timer of the access point is set to be a first back-off time value. The first back-off time value is less than a second back-off time value of any on board unit (OBU) which receives the traffic event packet. The traffic event packet is broadcasted by the access point when the back-off timer is counted down to be zero.
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Citations
12 Claims
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1. A controlling method of an access point in a geographic routing system, comprising:
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receiving a traffic event packet by the access point; and setting a back-off timer of the access point to be a first back-off time value, wherein the first back-off time value is less than a second back-off time value of any on board unit (OBU) which receives the traffic event packet; and broadcasting the traffic event packet by the access point when the back-off timer is counted down to be zero. - View Dependent Claims (2, 3)
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4. A controlling method of an access point in a geographic routing system, comprising:
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receiving a traffic event packet by the access point; and determining whether there is another access point which is closer to a destination area than the access point; forwarding the traffic event packet to the another access point, if there is the another access point which is closer to the destination area than the access point; and broadcasting the traffic event packet by the access point. - View Dependent Claims (5, 6)
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7. An access point in a geographic routing system, comprising:
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a transmitter for receiving a traffic event packet; and a processor setting a back-off timer of the access point to be a first back-off time value, wherein the first back-off time value is less than a second back-off time value of any on board unit (OBU) which receives the traffic event packet and the transmitter transmits the traffic event packet when the back-off timer of the access point is counted down to be zero. - View Dependent Claims (8, 9)
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10. An access point in a geographic routing system, comprising:
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a transmitter for receiving a traffic event packet and transmitting the traffic event packet when a back-off timer of the access point is counted down to be zero; and a location provider for providing a location of the access point; and a processor for determining whether there is another access point which is closer to a destination area than the access point according to the location of the access point, wherein the transmitter forwards the traffic event packet to the another access point, if there is the another access point which is closer to the destination area than the access point. - View Dependent Claims (11, 12)
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Specification