System and method for providing channel information of roadside unit
First Claim
1. A method for providing channel information of a roadside unit (RSU), comprising:
- predicting a direction of travel of an on-board unit (OBU) by one of a current RSU communicating with the OBU and a server coupled to the current RSU;
transmitting to the OBU information of a next RSU that will communicate with the OBU; and
communicating between the OBU and the next RSU using the transmitted information when the OBU enters a communication zone of the next RSU.
1 Assignment
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Accused Products
Abstract
A channel search in an intelligent transportation system is disclosed. A roadside unit (RSU) currently communicating with an on-board unit (OBU) or a server connected to the RSU predicts a direction in which the OBU is moving, searches or recognizes an RSU managing the predicted OBU and channel information and/or service information of the RSU, and transmits the searched or recognized information to the OBU. Therefore, when the OBU enters a new communication zone, the OBU communicates with the corresponding RSU by applying the previously received channel information. As a result, the OBU is informed of the channels of the next RSU in advance, thereby reducing a channel search time and receiving a wanted service.
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Citations
34 Claims
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1. A method for providing channel information of a roadside unit (RSU), comprising:
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predicting a direction of travel of an on-board unit (OBU) by one of a current RSU communicating with the OBU and a server coupled to the current RSU;
transmitting to the OBU information of a next RSU that will communicate with the OBU; and
communicating between the OBU and the next RSU using the transmitted information when the OBU enters a communication zone of the next RSU. - View Dependent Claims (2, 3, 4, 5, 6, 7, 28, 29, 30, 31)
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8. A method for providing channel information of a roadside unit (RSU), comprising:
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searching a communication zone prior to a current communication zone;
predicting a direction of movement of an on-board unit (OBU) by using information of at least one of an RSU of the prior communication zone and an RSU of the current communication zone; and
obtaining information of a next RSU which will manage the OBU. - View Dependent Claims (9, 10, 11, 12, 13, 14, 32)
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15. A method for providing channel information of a roadside unit (RSU), comprising:
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predicting a direction of movement of an on-board unit (OBU) by at least one of a current RSU currently communicating with the OBU and a server coupled to the current RSU;
determining a next RSU that is predicted to next manage the OBU and searching at least one of channel information and service information of the next RSU;
transmitting the searched information of the next RSU from the current RSU to the OBU; and
communicating between the OBU and the next RSU using the transmitted information when the OBU enters a communication zone of the next RSU. - View Dependent Claims (16, 17, 18, 33)
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19. A system for providing channel information of a roadside unit (RSU), comprising:
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a first RSU covering a first communication zone, and configured to communicate with an on-board unit (OBU), the OBU being in transit from the first communication zone to a second communication zone; and
a second RSU covering the second communication zone, and configured to communicate with the OBU when the OBU enters the second communication zone, wherein the first RSU provides information of the second RSU to the OBU while the OBU is in the first communication zone, and wherein the OBU uses the information of the second RSU to establish communication with the second RSU upon entering the second communication zone. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 34)
a radio frequency unit configured to transmit and receive information with the OBU and with other RSUs; and
a control unit configured to process received information and generate information to be transmitted.
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25. The system of claim 24, wherein the radio frequency unit comprises:
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an antenna configured to emit or receive a signal containing information;
a radio frequency converting unit, configured to convert an amplitude sequence keying (ASK) modulated signal into a prescribed radio frequency signal, and to convert an ASK modulated signal into a demodulatable ASK signal;
an ASK modem, configured to ASK modulate a data signal, and demodulate a received ASK signal; and
a sensor, configured to sense an operation state of the RSU.
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26. The system of claim 24, wherein the control unit comprises:
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a central processing unit (CPU) configured to process operations of the RSU and to monitor the OBU;
a transmission field-programmable gate array (FPGA) configured to output data from the CPU to the radio frequency unit by forming an appropriate communication frame by an active DSRC protocol; and
a reception FPGA configured to receive and extract data required for the CPU from the radio frequency unit.
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27. The system of claim 26, wherein the control unit further comprises:
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a display unit having an LCD display to display a state and operation to a user, and an LED to display a state of the RSU to the user;
an RS-232C configured to perform serial communication with a PC or server; and
an interface unit configured to communicate with a long distance server.
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34. The method of claim 19, wherein the information relates to a methodology of communicating between the second RSU and the OBU.
Specification