METHOD AND APPARATUS FOR TRANSMITTING FRAME IN WIRELESS LAN

• US 20170013645A1
• Filed: 12/17/2014
• Published: 01/12/2017
• Est. Priority Date: 02/18/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: CHOI, Jinsoo, RYU, Kiseon, LEE, Wookbong, CHUN, Jinyoung, LIM, Dongguk, CHO, Hangyu
• Granted Patent: US 10,080,240 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Disclosed are a method and an apparatus for transmitting a frame in a wireless LAN. The method for transmitting a frame in a wireless LAN may comprise the steps of: transmitting, by an AP, an RTS frame for medium protection to a first STA set; receiving, by the AP, CTS frames, in sequence, from each of a plurality of STAs included in a second STA set in response to the RTS frame, the second STA set being included in the first STA set; and transmitting, by the AP, each of a plurality of PPDUs to each of the plurality of STAs via each of a plurality of subbands for each of the plurality of STAs on an overlapping time resource.

Claims

1. A method for transmitting a frame in a wireless LAN, comprising:

transmitting, by an AP(access point), a RTS(request to send) frame for medium protection to a first STA(station) group;

sequentially receiving, by the AP, CTS(clear to send) frames from each of multiple STAs being included in a second STA set as a response to the RTS frame, wherein the second STA set is included in the first STA set; and

respectively transmitting, by the AP, each of multiple PPDUs (physical layer protocol data unit) to each of the multiple STAs through each of multiple subbands for each of the multiple STAs within an overlapping time resource.

2. The method of claim 1, wherein a RA(receiver address) field of the RTS frame comprises identification information respective to each of the multiple STAs included in the first STA set.

3. The method of claim 1, wherein the AP transmits a data unit including a dummy signal through a subband allocated to remaining STAs being included in the first STA set yet not included in the second STA set.

4. The method of claim 1, wherein the AP decides a transmission power for each of the multiple PPDUs based on a size of a subband allocated to remaining STAs being included in the first STA set yet not included in the second STA set.

5. The method of claim 1, wherein each of the multiple STAs transmits the CTS frame at a transmission timing being decided based on a position of each of multiple subbands for each of the multiple STAs within a frequency resource.

6. An AP(access point) transmitting a frame in a wireless LAN, comprising:

a RF(radio frequency) unit being configured to transmit or receive radio signals; and

a processor being operatively connected to the RF unit,

wherein the processor is configured;

to transmit a RTS(request to send) frame for medium protection to a first STA(station) group,

to sequentially receive CTS(clear to send) frames from each of multiple STAs being included in a second STA set as a response to the RTS frame, and

to respectively transmit each of multiple PPDUs (physical layer protocol data unit) to each of the multiple STAs through each of multiple subbands for each of the multiple STAs within an overlapping time resource, and

wherein the second STA set is included in the first STA set.

7. The AP of claim 6, wherein a RA(receiver address) field of the RTS frame comprises identification information respective to each of the multiple STAs included in the first STA set.

8. The AP of claim 6, wherein the AP transmits a data unit including a dummy signal through a subband allocated to remaining STAs being included in the first STA set yet not included in the second STA set.

9. The AP of claim 6, wherein the AP decides a transmission power for each of the multiple PPDUs based on a size of a subband allocated to remaining STAs being included in the first STA set yet not included in the second STA set.

10. The AP of claim 6, wherein each of the multiple STAs transmits the CTS frame at a transmission timing being decided based on a position of each of multiple subbands for each of the multiple STAs within a frequency resource.

11. A method for transmitting a frame in a wireless LAN, comprising:

transmitting, by an AP(access point), a RTS(request to send) frame for medium protection to a first STA(station) group;

receiving, by the AP, CTS(clear to send) frames from each of multiple STAs being included in a second STA set as a response to the RTS frame within an overlapping time resource and an overlapping frequency resource, wherein the second STA set is included in the first STA set; and

respectively transmitting, by the AP, each of multiple PPDUs (physical layer protocol data unit) to each of the multiple STAs included in the first STA set through each of multiple subbands for each of the multiple STAs included in the first STA set within an overlapping time resource,

wherein a RA(receiver address) field of the RTS frame comprises identification information respective to each of the multiple STAs included in the first STA set.

12. An AP(access point) transmitting a frame in a wireless LAN, comprising:

a RF(radio frequency) unit being configured to transmit or receive radio signals; and

a processor being operatively connected to the RF unit,

wherein the processor is configured;

to transmit a RTS(request to send) frame for medium protection to a first STA(station) group,

to receive CTS(clear to send) frames from each of multiple STAs being included in a second STA set as a response to the RTS frame within an overlapping time resource and an overlapping frequency resource, and

to respectively transmit each of multiple PPDUs (physical layer protocol data unit) to each of the multiple STAs included in the first STA set through each of multiple subbands for each of the multiple STAs included in the first STA set within an overlapping time resource,

wherein a RA(receiver address) field of the RTS frame comprises identification information respective to each of the multiple STAs included in the first STA set, and

wherein the second STA set is included in the first STA set.