Method for transmitting and receiving physical layer convergence procedure protocol data unit in wireless local area network system supporting power save mode operation and apparatus for the same

• US 9,674,783 B2
• Filed: 12/14/2015
• Issued: 06/06/2017
• Est. Priority Date: 05/31/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seok, Yong Ho
• Primary Examiner(s): Jung, Min
• Application Number:
  US14/967,852
• Publication Number:
  US 20160165625A1
• Time in Patent Office: 540 Days
• Field of Search: None
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: H04W 72/1263 Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of transmitting a data frame in a wireless local area network (WLAN) is provided. The method includes transmitting, by an access point (AP), a scheduling information element including information on a time period for data frame transmission to a first station (STA) and a second STA, wherein the scheduling information element includes an offset field indicating a start time point of the time period and transmitting, by the AP, the data frame to the first STA and the second STA by using a multi user-multiple input multiple output (MU-MIMO) transmission scheme after the start time point indicated by the offset field.

Claims

1. A method for a wireless local area network, the method comprising:

transmitting, by an access point (AP), a multi user-multiple input multiple output (MU-MIMO) scheduling information to a target station, the MU-MIMO scheduling information including a group ID field and a wakeup scheduling field, the group ID field including a group ID indicating a group of stations to which the target station belongs, the wakeup scheduling field including a wakeup offset indicating a start time for data transmission;

transmitting, by the AP, a beacon frame to the target station, the beacon frame including a traffic indication map (TIM) element indicating whether there is a buffered traffic to the target station; and

receiving, by the AP, a trigger frame as a response to the buffered traffic from the target station based on the wakeup offset.

2. The method of claim 1, further comprising:

transmitting, by the AP, a group ID management frame to the target station, the group ID management frame including information indicating the group ID.

3. The method of claim 1, wherein the MU-MIMO scheduling information is broadcast by the AP.

4. The method of claim 1, further comprising:

transmitting, by the AP, a data frame including the buffered traffic to the target station after receiving the trigger frame.

5. A device for a wireless local area network, the device comprising:

a radio frequency (RF) unit that receives and transmits radio signals; and

a processor, operatively coupled with the RF unit, that;

controls the RF unit to transmit a multi user-multiple input multiple output (MU-MIMO) scheduling information to a target station, the MU-MIMO scheduling information including a group ID field and a wakeup scheduling field, the group ID field including a group ID indicating a group of stations to which the target station belongs, the wakeup scheduling field including a wakeup offset indicating a start time for data transmission;

controls the RF unit to transmit a beacon frame to the target station, the beacon frame including a traffic indication map (TIM) element indicating whether there is a buffered traffic to the target station; and

controls the RF unit to receive a trigger frame as a response to the buffered traffic from the target station based on the wakeup offset.

6. The device of claim 5, wherein the processor:

controls the RF unit to transmit a group ID management frame to the target station, the group ID management frame including information indicating the group ID.

7. The device of claim 5, wherein the MU-MIMO scheduling information is broadcast by the device.

8. The device of claim 5, wherein the processor:

controls the RF unit to transmit a data frame including the buffered traffic to the target station after receiving the trigger frame.