Wireless communication terminal for multi-user uplink transmission, and wireless communication method

Patent metadata

Field	Value
Publication number	US-10477589-B2
Application number	US-201715676985-A
Country	US
Kind code	B2
Filing date	Aug 14, 2017
Priority date	Feb 13, 2015
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

The present invention relates to a wireless communication terminal and a wireless communication method for efficiently scheduling simultaneous uplink transmissions of a plurality of terminals.
To this end, provided are a wireless communication terminal, the terminal including: a transceiver; and a processor, wherein the processor receives, through the transceiver, a trigger frame transmitted by a base wireless communication terminal, and performs a multi-user uplink transmission based on the received trigger frame, wherein the trigger frame includes a predetermined field indicating whether an additional trigger frame is present or not, and a wireless communication method using the same.

First claim

The invention claimed is:

1. A wireless communication terminal, the terminal comprising:
a transceiver; and
a processor,
wherein the processor is configured to:
receive, through the transceiver, a trigger frame transmitted by a base wireless communication terminal, and
perform a multi-user uplink transmission based on the received trigger frame, wherein the trigger frame includes a predetermined field indicating whether an additional trigger frame is present; and
wherein when the trigger frame triggers a random access based multi-user uplink transmission and the terminal participates in the random access based multi-user uplink transmission in response to the trigger frame, the processor is further configured to:
decrement a backoff counter for the random access based multi-user uplink transmission by a maximum of N in response to the trigger frame, wherein the N is the number of resource unit(s) allocated for the random access based multi-user uplink transmission and the resource unit(s) are allocated by the trigger frame, and
perform the random access based multi-user uplink transmission when the backoff counter is decremented to 0.

2. The wireless communication terminal of claim 1 , wherein the predetermined field indicates whether or not an additional trigger frame follows the received trigger frame within a predetermined period.

3. The wireless communication terminal of claim 1 , wherein the processor determines a state of the terminal based on a value of the predetermined field when the received trigger frame does not indicate uplink transmission of the terminal.

4. The wireless communication terminal of claim 3 , wherein the processor maintains an awake state of the terminal when the predetermined field indicates that an additional trigger frame is present, and
wherein the processor switches the terminal to a doze state when the predetermined field indicates that no additional trigger frame is present.

5. The wireless communication terminal of claim 1 , wherein the trigger frame requests a buffer status report of at least one terminal, and
wherein the processor transmits, through the transceiver, buffer status information of the terminal on a random access basis in response to the reception of the trigger frame.

6. The wireless communication terminal of claim 5 , wherein the buffer status information of the terminal includes at least one of identifier information of the terminal, size information of data to be transmitted by the terminal, and access category information of data to be transmitted by the terminal.

7. A wireless communication method of a wireless communication terminal, the method comprising:
receiving a trigger frame transmitted by a base wireless communication terminal; and
performing a multi-user uplink transmission based on the received trigger frame,
wherein the trigger frame includes a predetermined field indicating whether an additional trigger frame is present,
wherein when the trigger frame triggers a random access based multi-user uplink transmission and the terminal participates in the random access based multi-user uplink transmission in response to the trigger frame, the performing the multi-user uplink transmission further comprises:
decrementing a backoff counter for the random access based multi-user uplink transmission by a maximum of N in response to the trigger frame, wherein the N is the number of resource unit(s) allocated for the random access based multi-user uplink transmission and the resource unit(s) are allocated by the trigger frame, and
performing the random access based multi-user uplink transmission when the backoff counter is decremented to 0.

8. The wireless communication method of claim 7 , wherein the predetermined field indicates whether or not an additional trigger frame follows the received trigger frame within a predetermined period.

9. The wireless communication method of claim 7 , wherein a state of the terminal is determined based on a value of the predetermined field when the received trigger frame does not indicate uplink transmission of the terminal.

10. The wireless communication method of claim 9 ,
wherein the terminal maintains an awake state when the predetermined field indicates that an additional trigger frame is present, and
wherein the terminal switches to a doze state when the predetermined field indicates that no additional trigger frame is present.

11. The wireless communication method of claim 7 , wherein the trigger frame requests a buffer status report of at least one terminal, and
wherein buffer status information of the terminal is transmitted on a random access basis in response to the reception of the trigger frame.

12. The wireless communication method of claim 11 , wherein the buffer status information of the terminal includes at least one of identifier information of the terminal, size information of data to be transmitted by the terminal, and access category information of data to be transmitted by the terminal.

Assignees

• Wilus Inst Standards & Tech Inc
• Sk Telecom Co Ltd

Inventors

• Ahn Woojin
• Kim Yongho
• Kwak Jinsam
• Son Juhyung

Classifications

• H04W84/12 Primary

  WLAN [Wireless Local Area Networks] · CPC title

• H04W28/0278

  using buffer status reports (dynamic wireless traffic scheduling definition H04W72/12) · CPC title

• H04W52/0219

  where the power saving management affects multiple terminals · CPC title

• H04W52/0229

  where the received signal is a wanted signal · CPC title

• H04W52/0216

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title