Method and device for downlink multi-user transmission in wireless communication system

• US 10,299,261 B2
• Filed: 08/05/2015
• Issued: 05/21/2019
• Est. Priority Date: 08/12/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chun, Jinyoung, Ryu, Kiseon, Lee, Wookbong, Choi, Jinsoo, Lim, Dongguk, Cho, Hangyu
• Primary Examiner(s): Sheikh, Ayaz R
• Assistant Examiner(s): Hampton, Tarell A
• Application Number:
  US15/502,973
• Publication Number:
  US 20170238286A1
• Time in Patent Office: 1,385 Days
• Field of Search: None
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• 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 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• 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 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention discloses a method and device for downlink multi-user (DL MU) transmission in a wireless communication system. In particular, the method for downlink multi-user data transmission in the wireless communication system includes the steps of receiving, by a station (STA), a DL MU data frame from an access point (AP) and transmitting, by the STA, an acknowledgement (ACK) frame in response to the DL MU data frame, wherein a plurality of ACK frames transmitted by a plurality of STAs in response to the DL MU data frame is multiplexed to configure an uplink multi-user (UP MU) ACK frame, and the time and/or size of a frequency resource at which the ACK frame is transmitted may be determined according to the level of a modulation and coding scheme (MCS) that is applied to the ACK frame.

Claims

1. A method for downlink multi-user (DL MU) data transmission in a wireless communication system, the method comprising:

receiving, by a station (STA), a DL MU data frame from an access point (AP); and

transmitting, by the STA, an acknowledgement (ACK) frame as a response to the DL MU data frame,

wherein a plurality of ACK frames transmitted by a plurality of the STAs as a response to the DL MU data frame is multiplexed to form an uplink multi-user (UL MU) ACK frame,

wherein a size of time and/or frequency resources in which the ACK frame is transmitted is determined depending on a modulation and coding scheme (MCS) level applied to the ACK frame, and

wherein, when a number of STAs to which the DL MU data frame is transmitted is greater than a number of minimum resource allocation units forming a channel bandwidth, an UL MU ACK frame comprising ACK frames corresponding to the number of minimum resource allocation units is transmitted, and an UL MU ACK frame comprising remaining ACK frames after a block ACK request frame of the AP is transmitted.

2. The method of claim 1, wherein the MCS level is indicated in the DL MU data frame.

3. The method of claim 2, wherein the MCS level is indicated as a difference value with an MCS level applied to the DL MU data frame.

4. The method of claim 2, wherein the MCS level is included in a signal (SIG) field of the DL MU data frame or a media access control (MAC) header of the DL MU data frame.

5. The method of claim 1, wherein an identical MCS level and/or an identical size of a resource region are used in all of the ACK frames forming the UL MU ACK frame.

6. The method of claim 1, wherein an MCS level and/or a size of a resource region used in the ACK frames forming the UL MU ACK frame are identically set in a channel bandwidth unit.

7. The method of claim 1, wherein the MCS level is determined to be identical with an MCS level applied to the DL MU data frame or determined to be a lowest coding rate in an identical modulation scheme.

8. The method of claim 1, wherein if the UL MU ACK frame is multiplexed with an UL data frame and transmitted, a region in which the ACK frame is transmitted is indicated by the DL MU data frame.

9. The method of claim 1, wherein a position of a frequency resource in which the ACK frame is transmitted is determined in a sequence of STAs indicated in the DL MU data frame or determined to be identical with a frequency resource in which the DL MU data frame has been transmitted.

10. The method of claim 1, wherein the ACK frame is transmitted in a channel to which a frequency resource allocated to the STA belongs in the DL MU data frame.

11. The method of claim 1, wherein the UL MU ACK frame is transmitted only in a primary channel.

12. The method of claim 1, wherein, if the ACK frame is a block acknowledgement (BA) frame, the BA frame comprises a frame control field, a BA information field, and a frame check sequence only.

13. A station (STA) apparatus supporting downlink multi-user (DL MU) data transmission in a wireless communication system, the STA apparatus comprising:

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

a processor,

wherein the processor is configured to receive a DL MU data frame from an access point (AP) and to transmit an acknowledgement (ACK) frame as a response to the DL MU data frame,

wherein a plurality of ACK frames transmitted by a plurality of STAs as a response to the DL MU data frame is multiplexed to form an uplink multi-user (UL MU) ACK frame,

wherein a size of time and/or frequency resources in which the ACK frame is transmitted is determined depending on a modulation and coding scheme (MCS) level applied to the ACK frame, and

wherein, when a number of STAs to which the DL MU data frame is transmitted is greater than a number of minimum resource allocation units forming a channel bandwidth, an UL MU ACK frame comprising ACK frames corresponding to the number of minimum resource allocation units is transmitted, and an UL MU ACK frame comprising remaining ACK frames after a block ACK request frame of the AP is transmitted.