DEDICATED CHANNEL ESTABLISHMENT METHOD FOR HIGH SPEED DATA TRANSMISSION IN RAILWAY WIRELESS SENSOR NETWORK

• US 20140336850A1
• Filed: 04/07/2014
• Published: 11/13/2014
• Est. Priority Date: 05/09/2013
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: KIM, Young Il, YEO, Geon Min, KIM, Jae Hoon
• Granted Patent: US 9,889,868 B2
• Time in Patent Office: Days
• US Class Current: 701/19
• CPC Class Codes: B61L 15/0027 Radio-based, e.g. using GSM-R
• CPC Class Codes: B61L 27/70 Details of trackside communication

Abstract

Disclosed is a railway wireless sensor network system. The railway wireless sensor network system includes a plurality of sensors which are included in a railway vehicle and measure an operation state of the railway vehicle in real time, a plurality of routers which receive information on the measured operation state through a dedicated channel with each sensor, and a gateway which receives information on the operation state through a dedicated channel between the routers, and periodically transmits information on the received operation state to a railway vehicle control center.

Claims

1. A railway wireless sensor network system comprising:

a plurality of sensors which are included in a railway vehicle and measure an operation state of the railway vehicle in real time;

a plurality of routers which receive information on the measured operation state through a dedicated channel with each sensor; and

a gateway which receives information on the operation state through a dedicated channel between the routers, and periodically transmits information on the received operation state to a railway vehicle control center.

2. The railway wireless sensor network system of claim 1, wherein the router sets the dedicated channel with the sensor and the dedicated channel between the routers by utilizing a contention-free period of a medium access control (MAC) frame.

3. The railway wireless sensor network system of claim 1, wherein, if a token issuing message is received from the gateway, the router sets the dedicated channel with the sensor and the dedicated channel between the routers.

4. The railway wireless sensor network system of claim 3, wherein the token issuing message includes a number of the router, numbers of sensors which are connected to the router, and information on a use period of the dedicated channel.

5. The railway wireless sensor network system of claim 1, wherein the gateway sets a dedicated channel with a router of a lowest hierarchy through the dedicated channel between the routers.

6. The railway wireless sensor network system of claim 1, wherein the gateway integrates dedicated channels between the plurality of routers and controls the integrated dedicated channels.

7. The railway wireless sensor network system of claim 1, wherein, when setting the dedicated channel between the routers, the router encapsulates a dedicated channel path between routers of a lower hierarchy of the router, and transmits the encapsulated path in a tunneling scheme.

8. The railway wireless sensor network system of claim 1, wherein the gateway binds a dedicated channel path between routers of a lower hierarchy of the router to the dedicated channel between the routers.

9. The railway wireless sensor network system of claim 1, wherein, if information on the operation state is not received from the router until a timer is terminated by operating the timer when issuing a token, the gateway transmits a path canceling message to the router so as to cancel the dedicated channel with the router.

10. The railway wireless sensor network system of claim 1, wherein, if the token issuing message is received from the gateway, the router operates a timer, and if information on the operation state is not received until the timer is terminated, the router cancels the dedicated channel between sensors, which are connected to the router, based on a token returning message which has been received from the gateway.

11. The railway wireless sensor network system of claim 1, wherein information on the operation state is information on temperatures and vibrations of bearings which are positioned at axles of the railway vehicle.

12. A method of operating a gateway in a railway wireless sensor network, the method comprising:

transmitting a token issuing message to a router;

receiving information on an operation state of a railway vehicle, which is measured in real time by a sensor included in the railway vehicle, from the router, through a dedicated channel which is set according to the token issuing message; and

transmitting the received information on the operation state, periodically, to a railway vehicle control center.

13. The method of claim 12, wherein the router sets a dedicated channel with the sensor and a dedicated channel between the routers by utilizing a contention-free period of a medium access control (MAC) frame.

14. The method of claim 12, wherein, if a token issuing message is received from the gateway, the router sets the dedicated channel with the sensor and the dedicated channel between the routers.

15. The method of claim 14, wherein the token issuing message includes a number of the router, numbers of sensors which are connected to the router, and information on a use period of the dedicated channel.

16. The method of claim 12, further comprising:

integrating dedicated channels between a plurality of routers and controlling the integrated dedicated channels after transmitting the token issuing message.

17. The method of claim 12, wherein, when setting the dedicated channel between the routers, the router encapsulates a dedicated channel path between routers of a lower hierarchy of the router, and transmits the encapsulated path in a tunneling scheme.

18. The method of claim 12, further comprising:

binding a dedicated channel path between routers of a lower hierarchy of the router to the dedicated channel between the routers after transmitting the token issuing message.

19. The method of claim 12, after transmitting the token issuing message, further comprising:

operating a timer; and

canceling the dedicated channel with the router by transmitting a path canceling message to the router if information on the operation state is not received from the router until the timer is terminated.

20. A method of operating a router in a railway wireless sensor network, the method comprising:

receiving a token issuing message from a gateway;

setting a dedicated channel with a sensor included in a railway vehicle and a dedicated channel with routers according to the token issuing message;

receiving information on an operation state of the railway vehicle, which is measured by the sensor, from the sensor, through the dedicated channel with the sensor; and

transmitting information on the received operation state to a gateway through the dedicated channel between the routers.