Method and apparatus of transmitting a spatial stream for MU-MIMO in a wireless local area network system

• US 10,652,701 B2
• Filed: 10/16/2014
• Issued: 05/12/2020
• 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
• Primary Examiner(s): Jiang, Charles C
• Assistant Examiner(s): Preval, Voster
• Application Number:
  US14/516,302
• Publication Number:
  US 20150036674A1
• Time in Patent Office: 2,035 Days
• 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)-multiple input multiple output (MIMO) in a wireless local area network system and a transmitter for performing the method are 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, wherein 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 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 method used in a wireless local area network, the method performed by a receiving station and comprising;

receiving a Very High Throughput (VHT) physical layer protocol data unit (PPDU) including a group identity (ID) field, a spatial stream (SS) field and a data field,

wherein the group ID field and the SS field are included in a VHT signal (SIG) field of the VHT PPDU,

wherein the SS field includes information on a total number of SSs used by the receiving station,

wherein the group ID field has a length of M bits representing 2^M different states, each of the 2^M different states including information for either a single user-multiple input multiple output (SU-MIMO) scheme used for the VHT PPDU or a group ID for a group to which the receiving station belongs, and

wherein only one state of the 2^M different states is used for the VHT PPDU being received from an access point (AP) based on the SU-MIMO scheme; and

decoding the data field based on the SS field.

2. The method of claim 1, wherein the VHT SIG field belongs to a physical layer preamble of the VHT PPDU.

3. The method of claim 1, wherein the receiving station is a non-AP station.

4. A receiving station for receiving a data packet in a wireless local area network, the receiving station comprising;

a transceiver configured to transmit and receive radio signals; and

a processor operably coupled to the transceiver and configured to;

control the transceiver to receive a Very High Throughput (VHT) physical layer protocol data unit (PPDU) including a group identity (ID) field, a spatial stream (SS) field and a data field,

wherein the group ID field and the SS field are included in a VHT signal (SIG) field of the VHT PPDU,

wherein the SS field includes information on a total number of SSs used by the receiving station,

wherein the group ID field has a length of M bits representing 2^M different states, each of the 2^M different states including information for either a single user-multiple input multiple output (SU-MIMO) scheme used for the VHT PPDU or a group ID for a group to which the receiving station belongs, and

wherein only one state of the 2^M different states is used for the VHT PPDU being received from an access point (AP) based on the SU-MIMO scheme; and

decode the data field based on the at least one SS field.

5. The receiving station of claim 4, wherein the VHT SIG field belongs to a physical layer preamble of the VHT PPDU.

6. The receiving station of claim 4, wherein the receiving station is a non-AP station.