METHOD FOR REPORTING CHANNEL INFORMATION BASED ON LINK ADAPTATION IN WIRELESS LOCAL AREA NETWORK AND THE APPARATUS FOR THE SAME

• US 20140293916A1
• Filed: 06/05/2014
• Published: 10/02/2014
• Est. Priority Date: 11/26/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: SOHN, Ill Soo, SEOK, Yong Ho, LEE, Dae Won, KANG, Byeong Woo, SONG, Kyoung Young
• Granted Patent: US 9,258,799 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/04 Wireless resource allocation

Abstract

A method and device for link adaptation in a wireless local area network system, are discussed. The method may include receiving, by a responding station, from a requesting station, a requesting Physical layer Protocol Data Unit (PPDU) for requesting a modulation and coding scheme (MCS) feedback via a plurality of spatial streams, the requesting PPDU including an MCS request (MRQ) field that is set to one to request the responding station to provide the MCS feedback; and transmitting, by the responding station, to the requesting station, the MCS feedback including a recommended MCS field and a recommended stream field. The recommended MCS field indicates a recommended MCS, the recommended stream field indicates a number of at least one recommended spatial stream, and the number of the at least one recommended spatial stream is less than a number of the plurality of spatial streams used for the requesting PPDU.

Claims

1. A method for link adaptation in a wireless local area network system, the method comprising;

receiving, by a responding station, from a requesting station, a requesting Physical layer Protocol Data Unit (PPDU) for requesting a modulation and coding scheme (MCS) feedback via a plurality of spatial streams, the requesting PPDU including an MCS request (MRQ) field that is set to one to request the responding station to provide the MCS feedback; and

transmitting, by the responding station, to the requesting station, the MCS feedback including a recommended MCS field and a recommended stream field,

wherein the recommended MCS field indicates a recommended MCS,

wherein the recommended stream field indicates a number of at least one recommended spatial stream,

wherein the number of the at least one recommended spatial stream is less than a number of the plurality of spatial streams used for the requesting PPDU, and

wherein the recommended MCS is estimated under an assumption that the requesting station will transmit at least one first spatial stream among the plurality of spatial streams used for the requesting PPDU.

2. The method of claim 1, wherein a number of the at least one first spatial stream used for estimating the recommended MCS is equal to the number of the at least one recommended spatial stream.

3. The method of claim 1, wherein the recommended stream field has 3 bits.

4. The method of claim 1, wherein the recommended MCS field has 4 bits.

5. The method of claim 1, wherein the requesting PPDU includes a stream indicator indicating the number of the plurality of spatial streams used for the requesting PPDU.

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

a transceiver configured to transmit and receive a radio signal; and

,

a processor operationally coupled to the transceiver and configured to;

instruct the transceiver to receive, from a requesting station, a requesting Physical layer Protocol Data Unit (PPDU) for requesting a modulation and coding scheme (MCS) feedback via a plurality of spatial streams, the requesting PPDU including an MCS request (MRQ) field that is set to one to request the processor to provide the MCS feedback; and

instruct the transceiver to transmit, to the requesting station, the MCS feedback including a recommended MCS field and a recommended stream field,

wherein the recommended MCS field indicates a recommended MCS,

wherein the recommended stream field indicates a number of at least one recommended spatial stream,

wherein the number of the at least one recommended spatial stream is less than a number of the plurality of spatial streams used for the requesting PPDU, and

wherein the recommended MCS is estimated under an assumption that the requesting station will transmit at least one first spatial stream among the plurality of spatial streams used for the requesting PPDU.

7. The device of claim 6, wherein a number of the at least one first spatial stream used for estimating the recommended MCS is equal to the number of the at least one recommended spatial stream.

8. The device of claim 6, wherein the recommended stream field has 3 bits.

9. The device of claim 6, wherein the recommended MCS field has 4 bits.

10. The device of claim 6, wherein the requesting PPDU includes a stream indicator indicating the number of the plurality of spatial streams used for the requesting PPDU.

11. A method for link adaptation in a wireless local area network system, the method comprising;

transmitting, by a requesting station, to a responding station, a requesting Physical layer Protocol Data Unit (PPDU) for requesting a modulation and coding scheme (MCS) feedback via a plurality of spatial streams, the requesting PPDU including an MCS request (MRQ) field that is set to one to request the responding station to provide the MCS feedback; and

receiving, by the requesting station, from the responding station, the MCS feedback including a recommended MCS field and a recommended stream field,

wherein the recommended MCS field indicates a recommended MCS,

wherein the recommended stream field indicates a number of at least one recommended spatial stream,

wherein the number of the at least one recommended spatial stream is less than a number of the plurality of spatial streams used for the requesting PPDU, and

wherein the recommended MCS is estimated by the responding station under an assumption that the requesting station will transmit at least one first spatial stream among the plurality of spatial streams used for the requesting PPDU.

12. The method of claim 11, wherein a number of the at least one first spatial stream used for estimating the recommended MCS is equal to the number of the at least one recommended spatial stream.

13. The method of claim 11, wherein the recommended stream field has 3 bits.

14. The method of claim 11, wherein the recommended MCS field has 4 bits.

15. The method of claim 11, wherein the requesting PPDU includes a stream indicator indicating the number of the plurality of spatial streams used for the requesting PPDU.