METHOD FOR UPLINK MULTI-USER TRANSMISSION IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR

• US 20170272138A1
• Filed: 08/24/2015
• Published: 09/21/2017
• Est. Priority Date: 08/22/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: CHUN, Jinyoung, RYU, Kiseon, LEE, Wookbong, CHO, Jinsoo, CHO, Hangyu, KIM, Suhwook
• Granted Patent: US 10,128,925 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 1/0643 block codes
• CPC Class Codes: H04L 1/1614 using bitmaps
• CPC Class Codes: H04L 1/1685 the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
• CPC Class Codes: H04L 65/40 Support for services or applications
• CPC Class Codes: H04L 69/323 in the physical layer [OSI layer 1]
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal

Abstract

In the present invention, disclosed is a method for uplink multi-user transmission in a wireless communication system and an apparatus therefor. Specifically, a method for performing, by a station (STA), uplink (UL) multi-user (MU) transmission in a wireless communication system comprises the steps of: receiving, from an access point (AP), a trigger frame including information for UL MU transmission; and transmitting an UL MU PPDU on the basis of the information for UL MU transmission, wherein the trigger frame is a medium access control (MAC) frame, a MAC header of the trigger frame includes a type field and a subtype field, and the type of the trigger frame may be indicated by the type field and the subtype field.

Claims

1. A method for performing uplink (UL) multi-user (MU) transmission by a station (STA) in a wireless communication system, the method comprising:

receiving a trigger frame including information for UL MU transmission from an access point (AP); and

transmitting a UL MU PPDU based on the information for the UL MU transmission,

wherein the trigger frame is a medium access control (MAC) frame,

the trigger frame includes a field for indicating a type of the trigger frame.

2. The method for performing uplink (UL) multi-user (MU) transmission of claim 1, wherein when the trigger frame is a type for triggering transmission of a UL MU data frame, the trigger frame includes an association identifier (AID) for each of STA performing the UL MU transmission, space resource indication information for the UL MU PPDU of each STA identified by the AID and frequency resource indication information for the UL MU PPDU of each STA identified by the AID.

3. The method for performing uplink (UL) multi-user (MU) transmission of claim 2, wherein the trigger frame further includes a modulation and coding scheme (MCS) level index of the UL MU PPDU of each STA identified by the AID and a coding type of the UL MU PPDU of each STA identified by the AID.

4. The method for performing uplink (UL) multi-user (MU) transmission of claim 1, wherein when the trigger frame is a type for triggering transmission of a downlink (DL) channel status report frame, the trigger frame includes the association identifier (AID), the space resource indication information for the UL MU PPDU, the frequency resource indication information for the UL MU PPDU, and information for measuring a DL channel for each STA performing the UL MU transmission.

5. The method for performing uplink (UL) multi-user (MU) transmission of claim 4, further comprising:

receiving a null data packet (NDP) for measuring the DL channel from the AP.

6. The method for performing uplink (UL) multi-user (MU) transmission of claim 4, wherein the information for measuring the DL channel includes the position of a channel to be measured and a channel measurement reporting method,

the position of the channel to be measured indicates a spatial stream and a frequency region which are a channel measurement object, and

the channel measurement reporting method indicates the unit of the frequency region for reporting a result of measuring the channel.

7. The method for performing uplink (UL) multi-user (MU) transmission of claim 4, wherein the trigger frame further includes information indicating whether a modulation and coding scheme (MCS) level index and space time block coding (STBC) are applied to the UL MU PPDU and length information of the UL MU PPDU.

8. The method for performing uplink (UL) multi-user (MU) transmission of claim 1, wherein when the trigger frame is a type for triggering random access, transmission of a probe request frame, or a buffer status report, the trigger frame includes a predetermined association identifier (AID).

9. The method for performing uplink (UL) multi-user (MU) transmission of claim 8, wherein the trigger frame further includes resource unit information of the UL MU PPDU.

10. The method for performing uplink (UL) multi-user (MU) transmission of claim 9, wherein the UL MU PPDU is transmitted through a resource which the STA arbitrarily selects based on the resource unit information.

11. The method for performing uplink (UL) multi-user (MU) transmission of claim 8, wherein the trigger frame further includes the information indicating whether the modulation and coding scheme (MCS) level index and the space time block coding (STBC) are applied to the UL MU PPDU, transmittable frequency resource indication information of the UL MU PPDU, and the length information of the UL MU PPDU.

12. The method for performing uplink (UL) multi-user (MU) transmission of claim 1, wherein when the trigger frame is a type for triggering transmission of a control frame, the trigger frame includes the association identifier (AID), space resource indication information for the UL MU PPDU, and frequency resource indication information for the UL MU PPDU for each STA performing the UL MU transmission.

13. The method for performing uplink (UL) multi-user (MU) transmission of claim 12, wherein the trigger frame further includes the information indicating whether the modulation and coding scheme (MCS) level index and the space time block coding (STBC) are applied to the UL MU PPDU and control type information for distinguishing the control frame.

14. (canceled)

15. A method for supporting uplink (UL) multi-user (MU) transmission by an access point (AP) in a wireless communication system, the method comprising:

transmitting a trigger frame including information for UL MU transmission to a station (STA); and

receiving a UL MU PPDU based on the information for the UL MU transmission,

wherein the trigger frame is a medium access control (MAC) frame,

the trigger frame includes a field for indicating a type of the trigger frame.

16. (canceled)