Method and apparatus for transmitting frame in wireless LAN

• US 10,034,288 B2
• Filed: 02/16/2015
• Issued: 07/24/2018
• Est. Priority Date: 03/03/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chun, Jinyoung, Lee, Wookbong, Ryu, Kiseon, Choi, Jinsoo, Lim, Dongguk, Cho, Hangyu
• Primary Examiner(s): Lopata, Robert
• Application Number:
  US15/123,415
• Publication Number:
  US 20160374085A1
• Time in Patent Office: 1,254 Days
• Field of Search: 370330
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/248 where transmission power control commands are generated based on a path parameter
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/58 Format of the TPC bits
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method and an apparatus for transmitting a frame in a wireless LAN are disclosed. The method for transmitting a frame in a wireless LAN comprises: by an STA, receiving an uplink transmission instruction frame from an AP; and by the STA, transmitting, to the AP, a first uplink frame as a response to the uplink transmission instruction frame, wherein the uplink transmission instruction frame instructs transmission of the first uplink frame and a second uplink frame on overlapping time resources, the first uplink frame is transmitted at a transmission timing determined on the basis of UIFS, and the UIFS may be a fixed value.

Claims

1. A method for transmitting a frame in a wireless local area network (LAN), comprising:

transmitting, by an access point (AP), a physical layer protocol data unit (PPDU) comprising an uplink transmission indication frame triggering transmission of a plurality of uplink frames from a plurality of stations, wherein uplink transmission power indexes for the plurality of stations are separately configured by the uplink transmission indication frame, wherein modulation and coding scheme (MCS) indexes for the plurality of uplink frames are separately configured by the uplink transmission indication frame, wherein the PPDU includes a legacy part and a non-legacy part following the legacy part, wherein the legacy part and the non-legacy part of the PPDU are corresponding to a same channel bandwidth, wherein the legacy part comprises a legacy short training field (L-STF), a legacy long training field (L-LTF), and a legacy signal (L-SIG) field, wherein the non-legacy part comprises a high efficiency short training field (HE-STF), a high efficiency long training field (HE-LTF), and a data field, wherein a first subcarrier spacing applied to the legacy part is different from a second subcarrier spacing applied to the non-legacy part; and

in response to the uplink transmission indication frame, receiving, by the AP, the plurality of uplink frames from the plurality of stations on an overlapped time duration, wherein the plurality of uplink frames are configured based on the uplink transmission power indexes and the MCS indexes.

2. The method of claim 1, wherein frequency resources for the plurality of uplink frames are separately configured by the uplink transmission indication frame.

3. The method of claim 2, wherein the plurality of uplink frames are received based on multiple-user (MU) orthogonal frequency division multiple access (OFDMA) scheme.

4. The method of claim 1, wherein the uplink transmission indication frame indicates identifiers of the plurality of stations.

13. The method of claim 1, wherein the same channel bandwidth is 20 MHz, and wherein the first subcarrier spacing is four times greater than the second subcarrier spacing.

5. An access point (AP) in a wireless local area network (LAN), comprising:

a radio frequency unit configured to transmit and receive a radio signal; and

a processor coupled to the radio frequency unit and configured to;

transmit a physical layer protocol data unit (PPDU) comprising an uplink transmission indication frame triggering transmission of a plurality of uplink frames from a plurality of stations, wherein uplink transmission power indexes for the plurality of stations are separately configured by the uplink transmission indication frame, wherein modulation and coding scheme (MCS) indexes for the plurality of uplink frames are separately configured by the uplink transmission indication frame, wherein the PPDU includes a legacy part and a non-legacy part following the legacy part, wherein the legacy part and the non-legacy part of the PPDU are corresponding to a same channel bandwidth, wherein the legacy part comprises a legacy short training field (L-STF), a legacy long training field (L-LTF), and a legacy signal (L-SIG) field, wherein the non-legacy part comprises a high efficiency short training field (HE-STF), a high efficiency long training field (HE-LTF), and a data field, wherein a first subcarrier spacing applied to the legacy part is different from a second subcarrier spacing applied to the non-legacy part; and

in response to the uplink transmission indication frame, receive the plurality of uplink frames from the plurality of stations on an overlapped time duration, wherein the plurality of uplink frames are configured based on the uplink transmission power indexes and the MCS indexes.

6. The access point of claim 5, wherein frequency resources for the plurality of uplink frames are separately configured by the uplink transmission indication frame.

7. The access point of claim 6, wherein the plurality of uplink frames are received based on multiple-user (MU) orthogonal frequency division multiple access (OFDMA) scheme.

8. The access point of claim 5, wherein the uplink transmission indication frame indicates identifiers of the plurality of stations.

14. The access point of claim 5, wherein the same channel bandwidth is 20 MHz, and wherein the first subcarrier spacing is four times greater than the second subcarrier spacing.

9. A wireless station in a wireless local area network (LAN), comprising:

a radio frequency unit configured to transmit and receive a radio signal; and

a processor coupled to the radio frequency unit and configured to;

receive, from an access point (AP), a physical layer protocol data unit (PPDU) comprising an uplink transmission indication frame triggering transmission of a plurality of uplink frames from a plurality of stations, wherein the uplink transmission indication frame includes uplink transmission power indexes separately configured for the plurality of stations, wherein the uplink transmission indication frame further includes modulation and coding scheme (MCS) indexes separately configured for the plurality of uplink frames, wherein the PPDU includes a legacy part and a non-legacy part following the legacy part, wherein the legacy part and the non-legacy part of the PPDU are corresponding to a same channel bandwidth, wherein the legacy part comprises a legacy short training field (L-STF), a legacy long training field (L-LTF), and a legacy signal (L-SIG) field, wherein the non-legacy part comprises a high efficiency short training field (HE-STF), a high efficiency long training field (HE-LTF), and a data field, wherein a first subcarrier spacing applied to the legacy part is different from a second subcarrier spacing applied to the non-legacy part;

in response to the uplink transmission indication frame, configure a uplink frame based on a corresponding uplink transmission power index and a corresponding MCS index for the wireless station; and

transmit the configured uplink frame to the AP on an overlapped time duration, during which the plurality of uplink frames are transmitted to the AP.

10. The wireless station of claim 9, wherein frequency resources for the plurality of uplink frames are separately configured by the uplink transmission indication frame.

11. The wireless station of claim 10, wherein the plurality of uplink frames are transmitted based on multiple-user (MU) orthogonal frequency division multiple access (OFDMA) scheme.

12. The wireless station of claim 9, wherein the uplink transmission indication frame indicates identifiers of the plurality of stations.

15. The wireless station of claim 9, wherein the same channel bandwidth is 20 MHz, and wherein the first subcarrier spacing is four times greater than the second subcarrier spacing.