Method and apparatus for multiple frame transmission for supporting MU-MIMO

• US 9,596,682 B2
• Filed: 05/09/2016
• Issued: 03/14/2017
• Est. Priority Date: 08/26/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seok, Yong Ho
• Primary Examiner(s): Sefcheck, Gregory
• Assistant Examiner(s): ULYSSE, JAEL M
• Application Number:
  US15/150,004
• Publication Number:
  US 20160255629A1
• Time in Patent Office: 309 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method of multi user multiple input multiple output (MIMO) communication in a wireless local area network (WLAN) system; and a transmitting device therefore are discussed. The method according to an embodiment includes generating an Aggregate-Medium Access Control Protocol Data Unit (A-MPDU) including an A-MPDU subframe, the A-MPDU subframe including a Medium Access Control Protocol Data Unit (MPDU) delimiter field; and selecting a type of a guard interval. When the A-MPDU is generated for a plurality of receiving devices, the transmitting device selects a short guard interval only if all of the plurality of receiving devices support the short guard interval. The MPDU delimiter field includes a null field and an MPDU length field, the null field indicates a corresponding A-MPDU subframe is used to pad the A-MPDU, and the MPDU length field indicates a length of an MPDU. The null field is a 1-bit information field.

Claims

1. A method of multi user multiple input multiple output (MIMO) communication in a wireless local area network (WLAN) system, the method being performed by a transmitting device and comprising:

generating, by the transmitting device, an Aggregate-Medium Access Control Protocol Data Unit (A-MPDU) including an A-MPDU subframe, the A-MPDU subframe including a Medium Access Control Protocol Data Unit (MPDU) delimiter field;

selecting, by the transmitting device, a type of a guard interval to be applied to the A-MPDU among a short guard interval and a long guard interval, wherein when the A-MPDU is generated for a plurality of receiving devices, the transmitting device selects the short guard interval only if all of the plurality of receiving devices support the short guard interval; and

transmitting, by the transmitting device, the A-MPDU by using the selected guard interval,

wherein the MPDU delimiter field includes a null field and an MPDU length field, the null field indicates a corresponding A-MPDU subframe is used to pad the A-MPDU, and the MPDU length field indicates a length of an MPDU of the corresponding A-MPDU subframe, and

wherein the null field is a 1-bit information field and a value of the null field is set to ‘

1’

when the corresponding A-MPDU subframe is used to pad the A-MPDU.

2. The method of claim 1, wherein the MPDU delimiter field is 4 byte information and is directly followed by the MPDU, which is directly followed by a padding field.

3. The method of claim 1, wherein the MPDU delimiter field further includes a Cyclic Redundancy Check (CRC) field, which is directly followed by a delimiter signature field.

4. The method of claim 1, wherein each bit of the null data is set to ‘

1’

.

5. The method of claim 1, wherein the transmitting device is an access point (AP) or a non-AP station.

6. A transmitting device for multi user multiple input multiple output (MIMO) communication in a wireless local area network (WLAN) system, the transmitting device comprising:

a radio frequency unit configured to transmit the A-MPDU by using the selected guard interval; and

a processor coupled to the radio frequency unit and configured to;

generate an Aggregate-Medium Access Control Protocol Data Unit (A-MPDU) including an A-MPDU subframe, the A-MPDU subframe including a Medium Access Control Protocol Data Unit (MPDU) delimiter field; and

select a type of a guard interval to be applied to the A-MPDU among a short guard interval and a long guard interval, wherein when the A-MPDU is generated for a plurality of receiving devices, the transmitting device selects the short guard interval only if all of the plurality of receiving devices support the short guard interval; and

wherein the MPDU delimiter field includes a null field and an MPDU length field, the null field indicates a corresponding A-MPDU subframe is used to pad the A-MPDU, and the MPDU length field indicates a length of an MPDU of the corresponding A-MPDU subframe, and

wherein the null field is a 1-bit information field and a value of the null field is set to ‘

1’

when the corresponding A-MPDU subframe is used to pad the A-MPDU.

7. The transmitting device of claim 6, wherein the MPDU delimiter field is 4 byte information and is directly followed by the MPDU, which is directly followed by a padding field.

8. The transmitting device of claim 6, wherein the MPDU delimiter field further includes a Cyclic Redundancy Check (CRC) field, which is directly followed by a delimiter signature field.

9. The transmitting device of claim 6, wherein each bit of the null data is set to ‘

1’

.

10. The transmitting device of claim 6, wherein the transmitting device is an access point (AP) or a non-AP station.