Method and apparaus for setting, transmitting and receiving data for virtual carrier sensing in wireless network communication

• US 20050163150A1
• Filed: 01/26/2005
• Published: 07/28/2005
• Est. Priority Date: 01/26/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yang, Chil-youl, Kim, Tae-kon, Kwon, Chang-yeul
• Granted Patent: US 7,817,614 B2
• Time in Patent Office: Days
• US Class Current: 370/445
• CPC Class Codes: H04L 27/0012 arrangements for identifying the type of modulation
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]

Abstract

Methods and apparatuses for setting, transmitting, and receiving virtual carrier sensing information in wireless network communications are provided. A receiving station in a wireless communications network receives a frame transmitted according to various modulation schemes and extracts information concerning virtual carrier sensing from a portion of the frame modulated using a basic modulation scheme, so that virtual carrier sensing is achieved using the extracted virtual carrier sensing information.

Claims

1. A method of setting virtual carrier sensing data in wireless network communications, the method comprising:

receiving a frame transmitted using a plurality of modulation schemes and extracting data for virtual carrier sensing from a modulated segment of the frame based on a basic modulation scheme; and

setting virtual carrier sensing using the extracted data.

2. The method of claim 1, wherein one of said modulation schemes is orthogonal frequency division multiplexing.

3. The method of claim 1, wherein said data for virtual carrier sensing is preceded by synchronization data.

4. The method of claim 1, wherein the basic modulation scheme has a data rate which is supported by any station.

5. The method of claim 1, wherein the extracting of the data is performed after checking whether there is an error in the modulated segment of the frame based on the basic modulation scheme.

6. The method of claim 1, wherein the setting of virtual carrier sensing further comprises transmitting the extracted data to a medium access control (MAC) layer.

7. The method of claim 6, further comprising setting the said extracted data as a parameter of a physical layer virtual carrier sensing indicator (PHY-RXSTART.indicator) vector and sending said vector to the MAC layer.

8. The method of claim 1, wherein the data for virtual carrier sensing has the same bit size and the same value as virtual carrier sensing data received in a next stage after the modulated segment of the frame based on the basic modulation scheme.

9. The method of claim 1, further comprising transmitting the frame after the expiration of a duration of time corresponding to the set virtual carrier sensing.

10. The method of claim 1, wherein information for the virtual carrier sensing includes a value obtained by converting a section for the virtual carrier sensing into bytes.

25. A recording medium on which a program to execute a method as claimed in claim 1 is recorded.

11. A method of transmitting data for virtual carrier sensing in wireless network communications for a plurality of modulated frames, the method comprising:

adding virtual carrier sensing data to a modulated segment of a frame based on a basic modulation scheme; and

transmitting said modulated segment.

12. The method of claim 11, wherein the basic modulation scheme is orthogonal frequency division multiplexing.

13. The method of claim 11, wherein the data for virtual carrier sensing is preceded by synchronization signal.

14. The method of claim 11, wherein the basic modulation scheme has a data rate which is supported by any station.

15. The method of claim 11, wherein the adding of the data is performed after setting a parity bit for error checking at the modulated segment of the frame based on the basic modulation scheme.

16. The method of claim 11, wherein the adding of the data further comprises transmitting the virtual carrier sensing data from a medium access control (MAC) layer to a physical layer.

17. The method of claim 16, further comprising storing the virtual carrier sensing data as a parameter of a vector of a physical layer virtual carrier sensing indicator (PHY-RXSTART.indicator) and transmitting said vector to the physical layer.

18. The method of claim 11, wherein the data for virtual carrier sensing has the same bit size and the same value as virtual carrier sensing data included in the next transmitted segment which is a modulated segment of the frame based on the basic modulation scheme.

19. The method of claim 11, wherein information for the virtual carrier sensing includes a value obtained by converting a section for the virtual carrier sensing into bytes.

26. A recording medium on which a program to execute a method as claimed in claim 11 is recorded.

20. An apparatus for wireless network communications comprising:

a frame receiving unit, which receives a frame transmitted using a plurality of modulation schemes and extracts virtual carrier sensing data from a modulated segment of the frame modulated by a basic modulation scheme;

a frame generating unit, which adds the virtual carrier sensing data to the frame; and

a transmitting unit, which transmits the frame with the virtual carrier sensing data added thereto.

21. The apparatus of claim 20, wherein the frame is transmitted on the basis of the extracted virtual carrier sensing data to avoid collision.

22. The apparatus of claim 21, wherein the frame receiving unit sends the data for virtual carrier sensing interpreted by a physical layer to a medium access control (MAC) layer.

23. The apparatus of claim 21, wherein the frame receiving unit sends the data for virtual carrier sensing generated by a medium access control (MAC) layer to a physical layer.

24. The method of claim 23, wherein information for the virtual carrier sensing includes a value obtained by converting a section for the virtual carrier sensing into a byte.