METHOD AND APPARATUS FOR TRANSMITTING DATA FRAME IN WLAN SYSTEM

• US 20120218983A1
• Filed: 06/28/2011
• Published: 08/30/2012
• Est. Priority Date: 06/29/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Noh, Yu Jin, Kang, Byeong Woo, Lee, Dae Won, Seok, Yong Ho
• Granted Patent: US 8,699,442 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04W 28/20 Negotiating bandwidth
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method of transmitting a data frame in a wireless local area network is provided. The method includes TXOP the step of: obtaining a transmission opportunity (TXOP) indicating a time interval during which a transmitter has a right to transmit at least one data frame and an available bandwidth for the TXOP and sequentially transmitting a plurality of data frames to at least one receiver during the TXOP, wherein a bandwidth of a subsequent data frame of the plurality of data frames is same to or narrower than a bandwidth of a preceding data frame of the plurality of data frames which is last previously transmitted before the subsequent data frame.

Claims

1-20. -20. (canceled)

21. A method of transmitting a data frame by a transmitter in a wireless local area network, the method comprising:

obtaining, by the transmitter, a transmission opportunity (TXOP) for a bandwidth, the TXOP indicating a interval of time when the transmitter has a right to exchange frame sequences;

if a specific condition in the TXOP is determined by the transmitter to have been met, setting, by the transmitter, a transmit bandwidth parameter of a non-initial data unit of a plurality of data units to be the same or narrower than a transmit bandwidth parameter of a preceding data unit of the plurality of data units; and

transmitting, by the transmitter during the TXOP, the non-initial data unit according to the transmit bandwidth parameter of the non-initial data unit.

22. The method of claim 21, wherein the step of obtaining the TXOP comprises:

transmitting a request to send a Request to Send (RTS) frame; and

receiving a clear to send a Clear to Send (CTS) frame.

23. The method of claim 22, wherein the RTS frame includes a RTS bandwidth and the CTS frame includes a CTS bandwidth.

24. The method of claim 23, wherein the CTS bandwidth is equal to or less than the RTS bandwidth.

25. The method of claim 24, wherein the transmit bandwidth parameter of the preceding data unit of the plurality of data units is the CTS bandwidth when the preceding data unit is an initial data unit of the plurality of data units.

26. The method of claim 21, wherein the step of obtaining, by the transmitter, the transmission opportunity (TXOP) for the bandwidth comprises:

obtaining, by the transmitter, the transmission opportunity (TXOP) for a bandwidth greater than 20 MHz.

27. A transmitter configured to transmit a data frame in a wireless local area network, the transmitter comprising:

a transceiver; and

a controller operatively connected to the transceiver and configured to

obtain a transmission opportunity (TXOP) for a bandwidth, the TXOP indicating an interval of time when the transmitter has a right to exchange frame sequences,

if a specific condition in the TXOP is determined to have been met, set a transmit bandwidth parameter of a non-initial data unit of a plurality of data units to be the same or narrower than a transmit bandwidth parameter of a preceding data unit of the plurality of data units, and

transmit, during the TXOP, the non-initial data unit according to the transmit bandwidth parameter of the non-initial data unit.

28. The transmitter of claim 27, wherein controller is configured to:

transmit a request to send a Request to Send (RTS) frame; and

receive a clear to send a Clear to Send (CTS) frame.

29. The transmitter of claim 28 wherein the RTS frame includes a RTS bandwidth and the CTS frame includes a CTS bandwidth.

30. The transmitter of claim 29, wherein the CTS bandwidth is equal to or less than the RTS bandwidth.

31. The transmitter of claim 30, wherein the transmit bandwidth parameter of the preceding data unit of the plurality of data units is the CTS bandwidth when the preceding data unit is an initial data unit of the plurality of data units.

32. The transmitter of claim 27, wherein the controller is configured to:

obtain the transmission opportunity (TXOP) for a bandwidth greater than 20 MHz.