PPDU RECEIVING METHOD AND APPARATUS BASED ON THE MIMO TECHNIQUE IN A WLAN SYSTEM

• US 20120327915A1
• Filed: 03/02/2011
• Published: 12/27/2012
• Est. Priority Date: 03/05/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kang, Byeong Woo, Noh, Yu Jin, Lee, Dae Won, Seok, Yong Ho
• Granted Patent: US 9,794,032 B2
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

Provided is a method of receiving a physical layer convergence procedure (PLCP) protocol data unit (PPDU) by an access point (AP) in a wireless local area (LAN) system. The method includes: allocating a first transmission channel bandwidth to a first station (STA) which is multiple input multiple output (MIMO)-paired with the AP; allocating a second transmission channel bandwidth to a second STA which is MIMO-paired with the AP; transmitting to the first STA and the second STA a sync trigger for determining a time point at which the first STA transmits a first PPDU and a time point at which the second STA transmits a second PPDU; and receiving simultaneously the first PPDU and the second PPDU from the first STA and the second STA.

Claims

1. A method of receiving a physical layer convergence procedure (PLCP) protocol data unit (PPDU) by an access point (AP) in a wireless local area (LAN) system, the method comprising:

allocating a first transmission channel bandwidth to a first station (STA) which is multiple input multiple output (MIMO)-paired with the AP;

allocating a second transmission channel bandwidth to a second STA which is MIMO-paired with the AP;

transmitting to the first STA and the second STA a sync trigger for determining a time point at which the first STA transmits a first PPDU and a time point at which the second STA transmits a second PPDU; and

receiving simultaneously the first PPDU and the second PPDU from the first STA and the second STA.

2. The method of claim 1, wherein the sync trigger is a clear to send (CTS) frame transmitted in response to a request to send (RTS) frame transmitted for frame transmission by the first STA and the second STA.

3. The method of claim 1, wherein the sync trigger is a CTS-to-self frame, a recipient address of the CTS-to-self frame indicating an address of the AP.

4. The method of claim 1,

wherein the sync trigger is a frame including sync triggering information, and

wherein the sync triggering information indicates a time point at which the first STA transmits the first PPDU and a time point at which the second STA transmits the second PPDU.

5. The method of claim 1, further comprising:

transmitting transmission channel indication information to the first STA, wherein the first transmission channel bandwidth is determined to the same bandwidth or a smaller bandwidth between a recommended transmission channel bandwidth indicated by the transmission channel indication information and a supported transmission channel bandwidth supported by the first STA.

6. The method of claim 5, wherein the transmission channel indication information is transmitted together with dedicated control information required individually by the first STA for the MIMO reception.

7. The method of claim 5, wherein the transmission channel indication information is configured in a bitmap format in which a value of the recommended transmission channel bandwidth corresponds to a specific bit value.

8. The method of claim 5, wherein the transmission channel indication information indicates whether a channel bandwidth divided by a specific bandwidth size can be used as a transmission channel in a bit format.

9. The method of claim 1, wherein the first transmission channel bandwidth and the second transmission channel bandwidth are less than or equal to a full bandwidth supported by the AP.

10. A wireless apparatus comprising:

a processor; and

a transceiver operatively coupled to the processor and transmitting and receiving a frame,

wherein the processor is configured for;

allocating a first transmission channel bandwidth to a first STA which is MIMO-paired with the AP;

allocating a second transmission channel bandwidth to a second STA which is MIMO-paired with the AP;

transmitting to the first STA and the second STA a sync trigger for determining a time point at which the first STA transmits a first PPDU and a time point at which the second STA transmits a second PPDU; and

receiving simultaneously the first PPDU and the second PPDU from the first STA and the second STA.