# US 10,320,529 B2 · Data transmission method in wireless communication system and device therefor

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- Number: US 10,320,529 B2
- Document ID: US10320529B2
- Status: Granted
- Kind: B2
- Application number: 15/516,325
- Filed: 2015-10-01
- Published: 2017-10-26
- Granted: 2019-06-11
- Earliest claimed: 2014-10-01
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jinyoung Chun; Kiseon Ryu; Jeongki Kim; Jinsoo Choi; Hangyu Cho
- Web page: https://patentgrep.com/patent/US10320529B2

## CPC

- H04B 7/0452: Multi-user MIMO systems
- H04B 7/0413: MIMO systems
- H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection}
- H04L 1/0025: {Transmission of mode-switching indication}
- H04L 1/0027: {Scheduling of signalling, e.g. occurrence thereof}
- H04L 1/0075: {Transmission of coding parameters to receiver (H04L1/0023 takes precedence)}
- H04L 1/0675: {characterised by the signaling}
- H04L 1/16: in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L 1/1614: {using bitmaps}
- H04L 1/1671: {the supervisory signal being transmitted together with control information}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 69/10: Streamlined, light-weight or high-speed protocols, e.g. express transfer protocol [XTP] or byte stream
- H04L 69/22: Parsing or analysis of headers
- H04L 69/324: in the data link layer [OSI layer 2], e.g. HDLC
- H04W 72/0466: {the resource being a scrambling code}
- H04W 80/02: Data link layer protocols
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Disclosed is a downlink (DL) multi-user (MU) transmission method of an AP device in a wireless local area network (WLAN) system including generating a DL MU physical protocol data unit (PPDU) including a physical preamble and a data field, the data field including at least one MAC protocol data unit (MPDU), the at least one MPDU including a MAC header and a MAC frame body, and the MAC header including ACK indication information for uplink (UL) MU transmission of an ACK frame as a response to data transmitted through the data field, and transmitting the DL MU PPDU.

## Claims

### Claim 1

A downlink (DL) multi-user (MU) transmission method in a wireless local area network (WLAN) system, the DL MU transmission method comprising:
generating a DL MU physical protocol data unit (PPDU) including a physical preamble and a data field,
wherein the data field includes at least one medium access control (MAC) protocol data unit (MPDU), the at least one MPDU includes a MAC header and a MAC frame body,
wherein the MAC header includes acknowledge (ACK) indication information,
wherein the ACK indication information includes frequency resource allocation information for an uplink (UL) MU orthogonal frequency division multiple access (OFDMA) transmission of ACK frames and modulation and coding scheme (MCS) level information, and
wherein the frequency resource allocation information includes an index value indicating a resource unit allocated for the UL MU OFDMA transmission of the ACK frames, and the resource unit corresponds to a 26-tone resource unit, a 52-tone resource unit, a 106-tone resource unit, a 242-tone resource unit, a 484-tone resource unit, or a 996-tone resource unit;
transmitting the DL MU PPDU to a plurality of recipient Stations (STAs); and
receiving the ACK frames from the plurality of recipient STAs simultaneously as a response to the DL MU PPDU.

### Claim 2 (depends on 1)

The DL MU transmission method of claim 1, wherein the MAC header includes an indicator indicating whether the ACK indication information is included or not.

### Claim 3 (depends on 2)

The DL MU transmission method of claim 2, wherein the indicator is included in a high efficiency (HE) control field included in the MAC header.

### Claim 4 (depends on 3)

The DL MU transmission method of claim 3, wherein the ACK indication information is included in the HE control field of the MAC header.

### Claim 5 (depends on 4)

The DL MU transmission method of claim 4, wherein the ACK indication information further includes length information of a UL MU PPDU carrying the ACK frames.

### Claim 6 (depends on 5)

The DL MU transmission method of claim 5, wherein the length information indicates a length of the UL MU PPDU in an Orthogonal Frequency Division Multiple (OFDM) symbol number unit.

### Claim 7 (depends on 1)

The DL MU transmission method of claim 1, wherein the MCS level information indicates an MCS level applied to the ACK frames.

### Claim 8 (depends on 7)

The DL MU transmission method of claim 7, wherein the MCS level applied to the ACK frames is selected among a predetermined number of lowest MCS levels.

### Claim 9 (depends on 8)

The DL MU transmission method of claim 8,
wherein the MCS level information indicates one of MCS levels 0 to 3,
wherein the MCS level 0 indicates BPSK modulation and 1/2 code rate coding, the MCS level 1 indicates QPSK modulation and 1/2 code rate coding, the MCS level 2 indicates QPSK modulation and 3/4 code rate coding, and the MCS level 3 indicates 16QAM modulation and 1/2 code rate coding.

### Claim 10

A Station (STA) device in a wireless local area network (WLAN) system, the STA device comprising:
a transceiver configured to transmit and receive a wireless signal; and
a processor configured to control the transceiver,
wherein the processor is further configured to:
generate a downlink (DL) multi-user (MU) physical protocol data unit (PPDU) including a physical preamble and a data field and transmits the DL MU PPDU,
wherein the data field includes at least one medium access control (MAC) protocol data unit (MPDU), the at least one MPDU includes a MAC header and a MAC frame body,
wherein the MAC header includes acknowledge (ACK) indication information,
wherein the ACK indication information includes frequency resource allocation information for an uplink (UL) MU orthogonal frequency division multiple access (OFDMA) transmission of ACK frames and modulation and coding scheme (MCS) level information, and
wherein the frequency resource allocation information includes an index value indicating a resource unit allocated for the UL MU OFDMA transmission of the ACK frames, and the resource unit corresponds to a 26-tone resource unit, a 52-tone resource unit, a 106-tone resource unit, a 242-tone resource unit, a 484-tone resource unit, or a 996-tone resource unit,
transmits the DL MU PPDU to a plurality of recipient STAs, and
receive the ACK frames from the plurality of recipient STAs simultaneously as a response to the DL MU PPDU.

### Claim 11 (depends on 10)

The STA device of claim 10, wherein the MAC header includes an indicator indicating whether the ACK indication information is included or not.

### Claim 12 (depends on 11)

The STA device of claim 11, wherein the indicator is included in a high efficiency (HE) control field included in the MAC header.

### Claim 13 (depends on 12)

The STA device of claim 12, wherein the ACK indication information is included in the HE control field of the MAC header.

### Claim 14 (depends on 13)

The STA device of claim 13, wherein the ACK indication information further includes length information of a UL MU PPDU carrying the ACK frames.

### Claim 15 (depends on 14)

The STA device of claim 14, wherein the length information indicates a length of the UL MU PPDU in an Orthogonal Frequency Division Multiple (OFDM) symbol number unit.

### Claim 16 (depends on 10)

The STA device of claim 10, wherein the MCS level information indicates an MCS level applied to the ACK frames.

### Claim 17 (depends on 16)

The STA device of claim 16, wherein the MCS level applied to the ACK frames is selected among a predetermined number of lowest MCS levels.

### Claim 18 (depends on 17)

The STA device of claim 17,
wherein the MCS level information indicates one of MCS levels 0 to 3,
wherein the MCS level 0 indicates BPSK modulation and 1/2 code rate coding, the MCS level 1 indicates QPSK modulation and 1/2 code rate coding, the MCS level 2 indicates QPSK modulation and 3/4 code rate coding, and the MCS level 3 indicates 16QAM modulation and 1/2 code rate coding.