METHOD AND APPARATUS FOR TRANSMITTING UPLINK IN WIRELESS COMMUNICATION SYSTEM

• US 20150382342A1
• Filed: 02/05/2014
• Published: 12/31/2015
• Est. Priority Date: 02/06/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: SEOK, Yongho
• Granted Patent: US 9,844,037 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method for transmitting an uplink includes: an STA1 transmitting to an AP each of multiple RTS frames through at least one channel from among multiple first channels; the STA1 receiving from the AP at least one CTS frame through at least one channel from among the multiple channels which have received the RTS frames; and an STA2 receiving from the AP at least one CTS frame through at least one channel from among multiple second channels, wherein the at least one CTS frame includes STA identifier information and channel information, the STA identifier information includes information for indicating the STA1 and the STA2, and wherein the channel information includes information on an uplink channel1 allocated for transmitting a data frame1 of the STA1 and information on an uplink channel2 allocated for transmitting a data frame2 of the STA2.

Claims

1. A method for transmitting an uplink in a wireless local area network (WLAN), the method comprising:

transmitting, by a first station (STA), to an access point (AP) each of a plurality of request to second (RTS) frames via at least one channel among a plurality of first channels;

receiving, by the first STA, at least one clear to send (CTS) frame from the AP, the at least one CTS frame received via at least one channel among channels via which the plurality of RTS frames are transmitted; and

receiving, by a second STA, at least one CTS frame from the AP via at least one channel among a plurality of second channels,

wherein at least one CTS frame includes STA identifier information and channel information,

wherein the STA identifier information includes information indicating each of the first STA and the second STA, and

wherein the channel information includes information on a first uplink channel allocated to transmit a first data frame of the first STA and information on a second uplink channel allocated to transmit a second data frame of the second STA.

2. The method of claim 1, further comprising:

transmitting, by the first STA, the first data frame via the first uplink channel; and

transmitting, by the second STA, the second data frame via the second uplink channel.

3. The method of claim 2, wherein a time when the transmission of the first data frame is completed is the same as a time when the transmission of the second data frame is completed.

4. The method of claim 3,

wherein when a transmission time of first effective uplink data included in the first data frame is shorter than a transmission time of first effective uplink data included in the second data frame, the first data frame includes null padding, and

wherein the null padding includes a repeated MAC protocol data unit (MPDU) delimiter field in which a MPDU length field is configured as 0.

5. The method of claim 2,

wherein the first data frame includes at least one first long training field (LTF),

wherein the second data frame includes at least one second LTF,

wherein the number of the at least one first LTF is the same as the number of the at least one second LTF, and

wherein each of the at least one first LTF and the at least one second LTF is a field used for channel prediction.

6. The method of claim 1,

wherein the STA identifier information includes a partial association identifiers (AID) value other than 1 bit corresponding to a most significant bit (MSB) among AIDs of each of the first STA and the second STA.

7. An access point (AP) receiving uplink data in a wireless local area network (WLAN), the AP comprising:

a radio frequency (RF) unit configured to transmit and receive a radio signal;

a processor operatively connected to the RF unit and configured to;

receive a plurality of request to second (RTS) frames from a first station (STA) via at least one channel among a plurality of first channels;

transmit at least one clear to send (CTS) frame to the first STA, the at least one CTS frame transmitted via at least one channel among channels via which the plurality of RTS frames are received; and

transmit the at least one CTS frame to a second STA via at least one channel among a plurality of second channels,

wherein at least one CTS frame includes STA identifier information and channel information,

wherein the STA identifier information includes information indicating each of the first STA and the second STA, and

wherein the channel information includes information on a first uplink channel allocated to transmit a first data frame of the first STA and information on a second uplink channel allocated to transmit a second data frame of the second STA.

8. The AP of claim 7,

wherein the processor is configured to:

receive the first data frame from the first STA via the first uplink channel; and

receive the second data frame from the second STA via the second uplink channel.

9. The AP of claim 8,

wherein a time when the transmission of the first data frame is completed is the same as a time when the transmission of the second data frame is completed.

10. The AP of claim 9,

wherein when a transmission time of first effective uplink data included in the first data frame is shorter than a transmission time of first effective uplink data included in the second data frame, the first data frame includes null padding, and

wherein the null padding includes a repeated MAC protocol data unit (MPDU) delimiter field in which a MPDU length field is configured as 0.

11. The AP of claim 8,

wherein the first data frame includes at least one first long training field (LTF),

wherein the second data frame includes at least one second LTF,

wherein the number of the at least one first LTF is the same as the number of the at least one second LTF, and

wherein each of the at least one first LTF and the at least one second LTF is a field used for channel prediction.

12. The AP of claim 7,

wherein the STA identifier information includes a partial association identifiers (AID) value other than 1 bit corresponding to a most significant bit (MSB) among AIDs of each of the first STA and the second STA.