Method and system for two-way packet radio-based electronic toll collection
First Claim
1. A two-way packet radio-based electronic toll collection method to be implemented on a highway, comprising the steps of:
- providing a communication tower which transmits continuously downlink communication packets that contain information regarding available uplink communication channels;
installing an in-vehicle unit in each vehicle passing along the highway to receive said downlink communication packets, said in-vehicle unit selecting one of said available uplink communication channels; and
exchanging toll collecting and payment information wirelessly between said in-vehicle unit and said communication tower via said one of said available uplink communication channels selected by said in-vehicle unit and a downlink communication channel corresponding thereto;
whereby, said method permits multiple users to compete for available said uplink communication channels to exchange said toll collecting and payment information simultaneously.
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Accused Products
Abstract
A two-way packet radio-based electronic toll collection system is to be installed on a highway and includes a main communication tower for transmitting continuously downlink communication packets that contain information regarding available uplink communication channels, and an in-vehicle unit installed in each vehicle passing along the highway to receive the downlink communication packets. The in-vehicle unit is capable of selecting one of the available uplink communication channels. The in-vehicle unit and the main communication tower exchange toll collecting and payment information wirelessly via the available uplink communication channel selected by the in-vehicle unit and a downlink communication channel corresponding thereto. When collision occurs along the packets transmitted by a number of in-vehicle units, a retransmission scheme is applied for each in-vehicle unit to guarantee successful communication between the tower and the in-vehicle unit.
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Citations
20 Claims
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1. A two-way packet radio-based electronic toll collection method to be implemented on a highway, comprising the steps of:
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providing a communication tower which transmits continuously downlink communication packets that contain information regarding available uplink communication channels; installing an in-vehicle unit in each vehicle passing along the highway to receive said downlink communication packets, said in-vehicle unit selecting one of said available uplink communication channels; and exchanging toll collecting and payment information wirelessly between said in-vehicle unit and said communication tower via said one of said available uplink communication channels selected by said in-vehicle unit and a downlink communication channel corresponding thereto; whereby, said method permits multiple users to compete for available said uplink communication channels to exchange said toll collecting and payment information simultaneously. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A two-way packet radio-based electronic toll collection system to be installed on a highway, comprising:
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a main communication tower for transmitting continuously downlink communication packets that contain information regarding available uplink communication channels; and an in-vehicle unit installed in each vehicle passing along the highway to receive said downlink communication packets, said in-vehicle unit selecting one of said available uplink communication channels; said in-vehicle unit and said main communication tower exchanging toll collecting and payment information wirelessly via said one of said available uplink communication channels selected by said in-vehicle unit and a downlink communication channel corresponding thereto. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification