# US 11,451,269 B2 · Method and system for multi-user transmit opportunity for multi-user multiple-input-multiple-output wireless networks

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- Number: US 11,451,269 B2
- Document ID: US11451269B2
- Status: Granted
- Kind: B2
- Application number: 17/240,115
- Filed: 2021-04-26
- Published: 2021-08-12
- Granted: 2022-09-20
- Earliest claimed: 2010-04-19
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Chunhui Zhu; Youngsoo Kim
- Web page: https://patentgrep.com/patent/US11451269B2

## CPC

- H04B 7/0413: MIMO systems
- H04B 7/0452: Multi-user MIMO systems
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04W 72/12: Wireless traffic scheduling
- H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02)
- H04W 72/30: Resource management for broadcast services
- 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

Wireless communication in a wireless system using a multiple user transmission opportunity is provided. Data blocks at a wireless station are transmitted to multiple wireless receivers over a shared wireless communication medium. The data blocks are organized in order of transmission priority based on access categories. Contention for access to the communication medium during a transmission opportunity period is based on a backoff timer of each access category and the transmission priority. Upon successful contention for a transmission opportunity period, during the transmission opportunity period, a data block of a primary access category is wirelessly transmitted from the wireless station to one or more primary destination wireless receivers. Simultaneously, a data block of a secondary access category is wirelessly transmitted from the wireless station to one or more secondary destination wireless receivers.

## Claims

### Claim 1

An operating method of a receiving station, comprising:
receiving a first data or a second data from a transmitting station during a transmission opportunity (TXOP); and
transmitting a block acknowledgement to the transmitting station,
wherein the first data pends in a primary access category and the second data pends in a secondary access category being different from the primary access category,
wherein the primary access category indicates an access category associated with an enhanced distributed channel access function (EDCAF) that gains channel access, and the secondary access category indicates an access category being not associated with the EDCAF that gains channel access, and
wherein a transmission of the first data and a transmission of a third data for another receiving station are performed simultaneously during the TXOP when the third data pends in the primary access category.

### Claim 2 (depends on 1)

The method of claim 1, wherein a duration of the TXOP is a TXOP limit of the primary access category.

### Claim 3

A receiving station, comprising:
a receiver configured to receive a first data or a second data from a transmitting station during a transmission opportunity (TXOP); and
a transmitter configured to transmit a block acknowledgement to the transmitting station,
wherein the first data pends in a primary access category and the second data pends in a secondary access category being different from the primary access category,
wherein the primary access category indicates an access category associated with an enhanced distributed channel access function (EDCAF) that gains channel access, and the secondary access category indicates an access category being not associated with the EDCAF that gains channel access, and
wherein a transmission of the first data and a transmission of a third data for another receiving station are performed simultaneously during the TXOP when the third data pends in the primary access category.

### Claim 4 (depends on 3)

The receiving station of claim 3, wherein a duration of the TXOP is a TXOP limit of the primary access category.

### Claim 5

An operating method of a transmitting station, comprising:
transmitting a first data or a second data to a receiving station during a transmission opportunity (TXOP); and
receiving a block acknowledgement from the receiving station,
wherein the first data pends in a primary access category and the second data pends in a secondary access category being different from the primary access category,
wherein the primary access category indicates an access category associated with an enhanced distributed channel access function (EDCAF) that gains channel access, and the secondary access category indicates an access category being not associated with the EDCAF that gains channel access, and
wherein a transmission of the first data and a transmission of a third data for another receiving station are performed simultaneously during the TXOP when the third data pends in the primary access category.

### Claim 6 (depends on 5)

The method of claim 5, wherein a duration of the TXOP is a TXOP limit of the primary access category.

### Claim 7

A transmitting station, comprising:
a transmitter configured to transmit a first data or a second data to a receiving station during a transmission opportunity (TXOP); and
a receiver configured to receive a block acknowledgement from the receiving station,
wherein the first data pends in a primary access category and the second data pends in a secondary access category being different from the primary access category,
wherein the primary access category indicates an access category associated with an enhanced distributed channel access function (EDCAF) that gains channel access, and the secondary access category indicates an access category being not associated with the EDCAF that gains channel access, and
wherein a transmission of the first data and a transmission of a third data for another receiving station are performed simultaneously during the TXOP when the third data pends in the primary access category.

### Claim 8 (depends on 7)

The transmitting station of claim 7, wherein a duration of the TXOP is a TXOP limit of the primary access category.