Wlan-Based No-Stop Electronic Toll Collection System and the Implementation Thereof

• US 20090121898A1
• Filed: 08/03/2006
• Published: 05/14/2009
• Est. Priority Date: 11/25/2005
• Status: Active Grant

• Current Assignee: Beijing Watch Data System Co. Ltd. (Watchdata System Company Limited)
• Original Assignee: Beijing Watch Data System Co. Ltd. (Watchdata System Company Limited)
• Inventors: Li, Yong, Jia, Lin, Gao, Xiang
• Granted Patent: US 7,999,697 B2
• Time in Patent Office: Days
• US Class Current: 340/928
• CPC Class Codes: G07B 15/063 using wireless information transmission between the vehicle and a fixed station identification of vehicles G08G

Abstract

A no-stop electronic toll collection (ETC) system based on WLAN is disclosed in the present invention. The system includes an on-board equipment, roadside equipments, a multiple access carriageway control system and a toll balance center. The communication is implemented between the on-board equipment and the roadside equipments according to the demand determined by the wireless local network protocol. The system offered in the present invention applies several technology means to effectively overcome the technology prejudice that the WLAN technology is not suitable for the ETC system. Compared with the existing technology, the present ETC system has the advantages of low cost, high efficiency, complete function and good performance index, therefore the present invention is very meaningful for the application and extension of the ETC system and the improvement of the industrial technology.

Claims

1. A no-stop electronic toll collection system includes the on-board equipment, roadside equipment, multiple access carriageway controlling system and toll balance center, wherein said on-board equipment is installed in the vehicle, several said roadside equipment are respectively connected with the multiple access carriageway controlling system;

Said multiple access carriageway controlling system reads and processes the related data uploaded by the roadside equipment, and sends the processed information to the toll balance center;

which is characterized in that;

A wireless network card is installed in said on-board equipment, and a wireless network card and a wireless access point are installed in said roadside equipment, and said on-board equipment wirelessly communicates with the roadside equipment through said wireless network card and the wireless access point;

Said on-board equipment communicates with the wireless access point of the roadside equipment via the wireless network card, using WLAN standard protocol.

2. A no-stop electronic toll collection system of claim 1 is characterized in that:

Said WLAN protocol includes but not limited to IEEE802.11 protocol.

3. A no-stop electronic toll collection system of claim 1 is characterized in that:

Said on-board equipment includes on-board unit and external component;

wherein the on-board unit includes wireless network card, power supply unit, and system interface unit used to store the vehicle data information and connect with the storage card Read-Write device, and said external component includes storage card media for storing the user data, Human Computer interface and storage card Read-Write device, and said on-board unit and external component exchange data with each other.

4. A no-stop electronic toll collection system of claim 3 is characterized in that:

The wireless network card of said on-board unit includes baseband processing unit, RF processing unit and antenna feeding unit;

wherein said power supply unit and the system interface unit are respectively connected with the baseband processing unit, and after obtains data from the external component, the system interface unit sends the data to the baseband processing unit, then the baseband processing unit sends the processed data to the RF processing unit, and externally outputs the data via the antenna feeding unit.

5. A no-stop electronic toll collection system of claim 4 is characterized in that:

Said RF processing unit also has a frequency converter.

6. A no-stop electronic toll collection system of claim 1 is characterized in that:

Said wireless access point applies a directional antenna.

7. A no-stop electronic toll collection system of claim 6 is characterized in that:

The horizontal angle in the beamwidth of said directional antenna is limited to the width of one carriageway.

8. A method to implement the no-stop electronic toll collection system of claim 1, and the electronic toll collection system includes the on-board equipments, roadside equipment, multiple access carriageway controlling system and toll balance center, wherein there are several roadside equipments;

Said on-board equipment is installed in the vehicle, several said roadside equipment are respectively connected with the multiple access carriageway controlling system;

Said multiple access carriageway controlling system reads and processes the related data uploaded by the roadside equipment, and sends the processed information to the toll balance center, which is characterized in that;

Said on-board equipment communicates with said roadside equipment using WLAN protocol.

9. A method to implement the no-stop electronic toll collection system of claim 8, which is characterized in that:

Said WLAN protocol includes but not limited to IEEE802.11 protocol.

10. A method to implement the no-stop electronic toll collection system of claim 8, which is characterized in that:

During the communication between said roadside equipment and the on-board equipment, a modulation mode combining orthogonal frequency division multiplexing and binary phase shift keying is applied for the baseband signal.

11. A method to implement the no-stop electronic toll collection system of claim 10, which is characterized in that:

During the process of said baseband signal, firstly baseband signal modulated by the binary phase shift keying is subjected to process of orthogonal frequency division multiplexing spread spectrum with several sub-carriers, and then enter the RF part;

in the RF part, the processed baseband signal is frequently converted and then transmitted.

12. A method to implement the no-stop electronic toll collection system of claim 11, which is characterized in that:

During said process of frequency converting, the frequency of said baseband signal is modulated to 5.8 GHz.

13. A method to implement the no-stop electronic toll collection system of claim 8, which is characterized in that:

During the communication between said roadside equipment and the on-board equipment, MAC layer communicates based on carrier sensing the multiple access/collision avoidance protocol.

14. A method to implement the no-stop electronic toll collection system of claim 13, which is characterized in that:

In said carrier sensing the multiple access/collision avoidance protocol, each node is designated with a peculiar competitive time slice, and if each node has information to be sent in the corresponding time slice, a transmission starts, and after other nodes detect the information transmission, the time slice will be stopped to propel, and all nodes resume the time slice propelling after the transmission is completed.

15. A method to implement the no-stop electronic toll collection system of claim 14, which is characterized in that:

In said carrier sensing the multiple access/collision avoidance protocol, the competitive time slice of the first node which accesses the WLAN firstly in the time sequence, automatically changes into a priority time slot which priors to other time slots, and the information of the first node in the front of the time sequence is prior to be transmitted.

16. A wireless access point antenna in the no-stop electronic toll collection system, and the electronic toll collection system includes the on-board equipments, roadside equipment, multiple access carriageway controlling system and toll balance center, wherein there are several roadside equipments;

Said on-board equipment is installed in the vehicle, several said roadside equipment are respectively connected with the multiple access carriageway controlling system;

Said multiple access carriageway controlling system reads and processes the related data uploaded by the roadside equipment, and sends the processed information to the toll balance center, which is characterized in that;

Said wireless access point antenna is a directional antenna for both transmitting and receiving.

17. A wireless access point antenna in the no-stop electronic toll collection system of claim 16, which characterized in that:

The beamwidth of said antenna is not larger than 5 degree in the horizontal direction.

18. A wireless access point antenna in the no-stop electronic toll collection system of claim 16, which characterized in that:

The beamwidth of said antenna is between 10 and 30 degree in the vertical direction.