ACCESS POINT, MOBILE STATION FOR WIRELESS COMMUNICATION SYSTEM, AND METHOD FOR CONTROLLING THE SAME

• US 20090061783A1
• Filed: 12/19/2007
• Published: 03/05/2009
• Est. Priority Date: 08/28/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd., Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd., Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: CHOI, Hyun Ho, Hwang, Hyo Sun, Kim, Young Soo, Hyon, Tae In, Ahn, Hyun Gi, Lee, In Sun
• Granted Patent: US 8,761,780 B2
• Time in Patent Office: Days
• US Class Current: 455/68
• CPC Class Codes: H04L 1/0004 applied to control information
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points

Abstract

An access point (AP) and a mobile station in a wireless communication system and a method of controlling the same are provided. A method of controlling an AP in a wireless communication system includes: determining whether a transmission of a control message is needed; transmitting the control message via a first frequency band when the transmission of the control message is needed; determining whether a transmission of a data message is needed; and transmitting the data message via a second frequency band when the transmission of the data message is needed

Claims

1. A method of controlling an access point (AP) in a wireless communication system, the method comprising:

determining whether a transmission of a control message is needed;

transmitting the control message via a first frequency band when the transmission of the control message is needed;

determining whether a transmission of a data message is needed; and

transmitting the data message via a second frequency band when the transmission of the data message is needed.

2. The method as claimed in claim 1 wherein the transmitting of the data message comprises:

determining whether the second frequency band is available when the transmission of the data message is needed; and

transmitting the data message via the second frequency band when the second frequency band is available.

3. The method as claimed in claim 2, further comprising:

switching to the first frequency band when the second frequency band is unavailable; and

transmitting the data message within a contention section of the first frequency band where the control message is not transmitted.

4. The method as claimed in claim 1, wherein the transmitting of the control message further comprises:

selecting a modulation and coding set (MCS) based on a channel state of the first frequency band.

5. The method as claimed in claim 1, further comprising.

performing a spectrum sensing operation for extracting an additional first frequency band.

6. The method as claimed in claim 5, further comprising:

determining whether an incumbent user for the first frequency band appears;

transmitting information about the extracted additional first frequency band to a mobile station via the second frequency band when the incumbent user appears; and

receiving a response signal from the mobile station via the extracted additional first frequency band.

7. The method as claimed in claim 1, wherein the first frequency band includes a very high frequency (VHF) or ultra high frequency (UHF) television (TV) band, and

the second frequency band includes an industrial, scientific, and medical (ISM) band.

8. A method of transmitting a signal of an AP in a wireless communication system capable of using at least two frequency bands, the method comprising:

transmitting a control message via a first frequency band; and

transmitting a data message via a second frequency band after transmitting the control message,

wherein the first frequency band is a lower frequency band than the second frequency band.

9. A method of controlling a mobile station in a wireless communication system, the method comprising:

determining whether a transmission of a control message is needed;

transmitting the control message via a VHF or UHF TV band when the transmission of the control message is needed;

determining whether a transmission of a data message is needed;

transmitting the data message via an ISM band when the transmission of the data message is needed;

determining whether an incumbent user for the VHF or UHF TV band appears;

switching to the ISM band when the incumbent user appears;

receiving information about an additional VHF or UHF TV band from the AP via the ISM band; and

transmitting a response signal to the AP via the additional VHF or UHF TV band.

10. The method as claimed in claim 9, wherein the determining whether the incumbent user for the VHF or UHF TV band appears adopts at least one of a scheme of determining whether the incumbent user appears when a wireless communication fails during a predetermined threshold time, and a scheme of sensing the incumbent user by using a periodical signal and thereby determining whether the incumbent user appears.

11. A computer-readable recording medium storing a program for implementing a method of controlling an AP in a wireless communication system, the method comprising:

determining whether a transmission of a control message is needed;

transmitting the control message via a first frequency band when the transmission of the control message is needed;

determining whether a transmission of a data message is needed; and

transmitting the data message via a second frequency band when the transmission of the data message is needed.

12. An AP of a wireless communication system, comprising:

a first determination unit to determine whether a transmission of a control message is needed;

a first transmitter to transmit the control message via a first frequency band when the transmission of the control message is needed;

a second determination unit to determine whether a transmission of a data message is needed; and

a second transmitter to transmit the data message via a second frequency band when the transmission of the data message is needed.

13. The AP as claimed in claim 12, further comprising:

a sensing unit to perform a spectrum sensing operation for extracting an additional first frequency band.

14. The AP as claimed in claim 13, further comprising:

a third determination unit to determine whether an incumbent user for the first frequency band appears;

a third transmitter to transmit information about the extracted additional first frequency band to a mobile station via the second frequency band when the incumbent user appears; and

a receiver to receive a response signal from the mobile station via the extracted additional first frequency band.

15. The AP as claimed in claim 12, wherein the first frequency band includes a VHF or UHF TV band, and

the second frequency band includes an ISM band.

16. The AP as claimed in claim 12, wherein the control message includes at least one of a beacon message, a request to send (RTS) message, and a clear to send (CTS) message, and

the data message includes at least one of data and an acknowledgement (ACK) message.

17. A mobile station of a wireless communication system, comprising:

a first determination unit to determine whether a transmission of a control message is needed;

a first transmitter to transmit the control message via either a VHF or UHF TV band when the transmission of the control message is needed;

a second determination unit to determine whether a transmission of a data message is needed;

a second transmitter to transmit the data message via an ISM band when the transmission of the data message is needed;

a third determination unit to determine whether an incumbent user for the VHF or UHF TV band appears;

a switching unit to switch to the ISM band when the incumbent user appears;

a receiver to receive information about an additional VHF or UHF TV band from the AP via the ISM band; and

a third transmitter to transmit a response signal to the AP via the additional VHF or UHF TV band.

18. The mobile station as claimed in claim 17, wherein the third determination unit adopts at least one of a scheme of determining whether the incumbent user appears when a wireless communication fails during a predetermined threshold time, and a scheme of sensing the incumbent user by using a periodical signal and thereby determining whether the incumbent user appears.

19. The mobile station as claimed in claim 18, wherein the control message includes at least one of a beacon message, an RTS message, and a CTS message, and

the data message includes at least one of data and an acknowledgement message.

20. The mobile station as claimed in claim 19, wherein the predetermined threshold time is a period of the beacon message.