HIDDEN NODE DETECTION METHOD AND APPARATUS IN WIRELESS COMMUNICATION SYSTEM

• US 20150208441A1
• Filed: 08/15/2014
• Published: 07/23/2015
• Est. Priority Date: 01/21/2014
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: YOO, Sung Jin, PAK, Jin Suk, JEONG, Byung Jang, HWANG, Sung Hyun
• Granted Patent: US 9,532,381 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 74/0816 with collision avoidance

Abstract

Provided is a hidden node detection method and apparatus in a wireless communication system, the apparatus including a sensing unit to sense a first communication device transmitting a data signal from among a plurality of communication devices sharing a wireless channel, a transmitter to generate a reception notification signal in response to the sensing, and transmit the reception notification signal to the a plurality of communication devices through a band identical to a transmission band of the data signal, and a controller to prevent a collision with the data signal transmitted from the first communication device through the wireless channel by delaying processing of a data transmission request when the data transmission request is input from a second communication device among the plurality of communication devices while maintaining the transmitting of the reception notification signal.

Claims

1. A hidden node detection apparatus in a wireless communication system, the apparatus comprising:

a sensing unit to sense a first communication device transmitting a data signal from among a plurality of communication devices sharing a wireless channel;

a transmitter to generate a reception notification signal in response to the sensing, and transmit the reception notification signal to the a plurality of communication devices through a band identical to a transmission band of the data signal; and

a controller to prevent a collision with the data signal transmitted from the first communication device through the wireless channel by delaying processing of a data transmission request when the data transmission request is input from a second communication device among the plurality of communication devices while maintaining the transmitting of the reception notification signal.

2. The apparatus of claim 1, wherein the sensing unit senses the first communication device transmitting the data signal, based on a carrier sensing scheme.

3. The apparatus of claim 1, wherein the sensing unit senses a communication device transmitting a data signal having an intensity greater than a set threshold, to be the first communication device.

4. The apparatus of claim 1, wherein the sensing unit senses a communication device transmitting a data signal from which a destination address identical to a set device address is acquired, to be the first communication device.

5. The apparatus of claim 1, wherein the transmitter generates the reception notification signal to comprise predetermined power information, and transmits the reception notification signal to the plurality of communication devices.

6. The apparatus of claim 1, wherein when an intensity of the data signal is less than or equal to a set threshold, the transmitter suspends transmission of the reception notification signal.

7. The apparatus of claim 1, wherein when a frame length calculated with respect to the data signal satisfies a determined overall frame length value, the transmitter suspends transmission of the reception notification signal.

8. The apparatus of claim 6, wherein when the transmitting of the reception notification signal is suspended, the controller controls a data signal of the second communication apparatus to be transmitted through the wireless channel in response to the data transmission request.

9. The apparatus of claim 1, further comprising:

a determiner to determine a transmission time during which the transmitting of the reception notification signal is maintained based on length field information in a physical layer convergence procedure (PLCP) header included in the data signal, or duration information in a media access control (MAC) address header included in the data signal.

10. The apparatus of claim 9, wherein the transmitter encodes information on the transmission time to the reception notification signal, and transmits the encoded reception notification signal.

11. The apparatus of claim 9, wherein the determiner determines, to be the transmission time, a value obtained by dividing a channel occupation time during which the first communication apparatus occupies the wireless channel by a compression ratio of the reception notification signal.

12. The apparatus of claim 1, wherein the transmitter generates the reception notification signal based on a tone signal of at least one narrowband.

13. The apparatus of claim 12, wherein the transmitter transmits the reception notification signal of the narrowband to have a greater power density per frequency than that of the data signal.

14. The apparatus of claim 1, further comprising:

a detector to detect whether the reception notification signal is received by the plurality of communication devices, based on a difference in an average power density between a band to which the reception notification signal is transmitted and a band to which the reception notification signal is not transmitted.

15. The apparatus of claim 1, wherein the transmitter transmits the reception notification signal to the plurality of communication devices based on a frequency interval in the wireless channel, aside from a band through which the data signal is transmitted.

16. The apparatus of claim 1, further comprising:

a tone signal unit to receive a request-to-send tone (RTST) signal of a tone structure from the first communication device before transmission of the data signal, transmits a clear-to-send tone (CTST) signal of a tone structure in response to the receiving of the RTST signal, and provides, to the second communication device, notification on the transmitting of the data signal transmitted from the first communication device through the wireless channel.

17. A hidden node detection method in a wireless communication system, the method comprising:

sensing a first communication device transmitting a data signal, from among a plurality of communication devices sharing a wireless channel;

generating a reception notification signal in response to the sensing, and transmitting the generated reception notification signal to the plurality of communication devices through a band identical to a transmission band of the data signal; and

preventing a collision with the data signal transmitted from the first communication device through the wireless channel, by delaying processing of a data transmission request when the data transmission request is input from a second communication device among the plurality of communication devices while maintaining transmission of the reception notification signal.

18. The method of claim 17, further comprising:

suspending transmission of the reception notification signal when an intensity of the data signal is less than or equal to a set threshold, or when a frame length calculated with respect to the data signal satisfies a determined overall frame length value; and

controlling, when the transmission of the reception notification signal is suspended, in response to the data transmission request, the data signal of the second communication device to be transmitted through the wireless channel.

19. The method of claim 17, wherein the transmitting comprises generating the reception notification signal based on a tone signal of at least one narrowband, and transmitting the reception notification signal of the narrowband to have a greater power density per frequency than that of the data signal.

20. The method of claim 17, further comprising:

determining a transmission time during which transmission of the reception notification signal is maintained, based on length field information in a physical layer convergence procedure (PLCP) header comprised in the data signal, or duration information in a media access control (MAC) address header comprised in the data signal; and

encoding information on the transmission time to the reception notification signal and transmitting the encoded reception notification signal to the plurality of communication devices.