METHOD AND APPARATUS OF TRANSMITTING A SPATIAL STREAM FOR MU - MIMO IN A WIRELESS LOCAL AREA NETWORK SYSTEM

• US 20130329680A1
• Filed: 08/19/2013
• Published: 12/12/2013
• Est. Priority Date: 01/29/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Dae Won, SEOK, Yong Ho
• Granted Patent: US 8,891,659 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04W 4/08 User group management
• CPC Class Codes: H04W 72/046 the resource being in the space domain, e.g. beams
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method of transmitting a spatial stream for multi user (MU)-mulitple input multiple output (MIMO) in a wireless local area network system, performed by a transmitter is provided. The method includes transmitting, to a receiver, a management frame including group information to assign or change a position of a plurality of spatial streams corresponding to each of a plurality of groups, and transmitting, to the receiver, a frame including at least one spatial stream, where the group information includes a plurality of group indicators and a plurality of spatial stream (SS) indicators, each of the plurality of group indicators indicating whether or not the receiver is a member of each of the plurality of groups, each of the plurality of SS indicators indicating a position of the plurality of spatial streams corresponding to each of the plurality of groups.

Claims

1. A wireless apparatus in a wireless local area network, the wireless apparatus comprising:

a multi-user (MU)-multiple input multiple output (MIMO) transmitter configured to transmit radio signals; and

a processor coupled to the MU-MIMO transmitter and configured to transmit a management frame including group information to a receiver in order to assign or change a position of at least one spatial stream of the receiver to at least one of a plurality of groups,

wherein the group information includes a plurality of group indicators and a plurality of spatial stream (SS) indicators;

wherein each of the plurality of group indicators indicates whether the receiver is a member of a corresponding group, and

wherein each of the plurality of SS indicators indicates a position of a spatial stream of the corresponding group.

2. The wireless apparatus of claim 1, wherein each of the plurality of SS indicators further indicates the position of the spatial stream within four spatial streams.

3. The wireless apparatus of claim 1, wherein the MU-MIMO transmitter is an access point (AP).

4. The wireless apparatus of claim 1, wherein the group information further includes information to assign or change the position of the at least one spatial stream of the receiver to the at least one of the plurality of groups.

5. The wireless apparatus of claim 1, wherein the processor is further configured to transmit a frame via the at least one spatial stream according to the group information.

6. The wireless apparatus of claim 5, wherein the frame includes a header including a group identity field that indicates a membership group of the plurality of groups to which the receiver belongs.

7. The wireless apparatus of claim 6, wherein transmitting the frame comprises:

transmitting the frame via single user (SU)-MIMO (SU-MIMO) transmission if the group identity field is set to a predefined value.

8. The wireless apparatus of claim 6, wherein the header further includes a long training field used to estimate a channel for decoding the at least one spatial stream.

9. The wireless apparatus of claim 1, wherein the MU-MIMO transmitter is a base station.