Channel sounding method in wireless communication system and device for same

Patent metadata

Field	Value
Publication number	US-10548146-B2
Application number	US-201615566596-A
Country	US
Kind code	B2
Filing date	Apr 15, 2016
Priority date	Apr 16, 2015
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

An uplink (UL) sounding support method of a station (STA) for measuring a an UL channel state in a wireless local area network (WLAN) system, according to one embodiment of the present invention, comprises the steps of: receiving null data packet announcement (NDPA) information indicating an UL transmission of an the NDP frame; receiving trigger information indicating an UL MU transmission resource of the NDP frame; and UL multi-user (MU)-transmitting the NDP frame using the UL MU transmission resource indicated by the trigger information, wherein the trigger information may comprise at least one of spatial resource information or the frequency resource information to be used for the UL MU transmission of the NDP frame.

First claim

The invention claimed is:

1. A method for supporting UL sounding of a station (STA) for measuring an uplink (UL) channel state in a wireless LAN (WLAN) system, the method comprising steps of:
receiving, from an Access Point (AP), null data packet (NDP) announcement (NDPA) information related to an UL transmission of an NDP frame;
receiving, from the AP, trigger information for an UL multi-user (MU) transmission resource of the NDP frame; and
UL MU-transmitting, to the AP, the NDP frame using the UL MU transmission resource indicated by the trigger information,
wherein the trigger information comprises at least one of spatial resource information or frequency resource information to be used for the UL MU transmission of the NDP frame,
wherein the NDPA information is received on a NDPA frame, and
wherein the NDPA frame includes a sounding token field for identifying a format of the NDPA frame,
wherein the spatial resource information includes an index of at least one spatial stream to be used for the UL transmission of the NDP frame.

2. The method of claim 1 , wherein the frequency resource information includes an index of at least one measuring frequency resource unit to be used for the UL transmission of the NDP frame.

3. The method of claim 1 , wherein the trigger information is received on a trigger frame.

4. The method of claim 1 , wherein the NDPA frame further includes association identifier (AID) information of STAs which are to transmit the NDP frame.

5. The method of claim 3 , wherein the trigger frame comprises at least one of association identifier (AID) information of the STAs which are to transmit the NDP frame, the frequency resource information of the NDP frame and the spatial resource information of the NDP frame.

6. The method of claim 5 , wherein, when the NDP frame is included in an UL physical protocol data unit (PPDU) and transmitted, the trigger frame further comprises feedback type information indicating whether the NDP frame is transmitted in a full band of the UL PPDU or in a partial band of the UL PPDU.

7. The method of claim 1 , wherein the NDPA information and the trigger information are received on a single NDPA frame.

8. The method of claim 1 , wherein the NDPA frame further includes a STA info field.

9. The method of claim 8 , wherein the STA info field further comprises a feedback type field indicating whether the NDP frame is UL-MU transmitted or not.

10. The method of claim 9 , wherein, when the feedback type field indicates the UL MU transmission of the NDP frame, the STA info field further comprises a measuring frequency resource unit field indicative of the frequency resource information of the NDP frame and an Nc index field indicative of the spatial resource information of the NDP frame.

11. The method of claim 1 , wherein the NDPA information and the trigger information are received on a single trigger frame.

12. The method of claim 11 , wherein the trigger frame comprises:
a common information field comprising common information about STAs receiving the trigger frame, and
a user-specific field comprising individual information about each STA receiving the trigger frame.

13. The method of claim 12 , wherein the user-specific field comprises at least one of association identifier (AID) information of STAs which are to transmit the NDP frame, feedback type information indicating whether the NDP frame is UL-multi-user (MU)-transmitted or not, the frequency resource information of the NDP frame, and the spatial resource information of the NDP frame.

14. The method of claim 1 , wherein the NDP frame comprises a legacy-short training field (L-STF), a legacy-long training field (L-LTF), a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field, a high efficiency signal (HE-SIG) A field, a high efficiency STF (HE-STF) and a high efficiency LTF (HE-LTF).

15. A station (STA) device in a wireless LAN (WLAN) system, the STA comprising:
a transceiver configured to transceive a radio signal; and
a processor configured to control the transceiver,
wherein the processor is further configured to:
receive, from an Access Point (AP), null data packet (NDP) announcement (NDPA) information related to an UL transmission of an NDP frame,
receive, from the AP, trigger information for an UL multi-user transmission resource of the NDP frame, and
UL MU-transmit, to the AP, the NDP frame using the UL MU transmission resource indicated by the trigger information,
wherein the trigger information comprises at least one of spatial resource information or frequency resource information to be used for the UL MU transmission of the NDP frame,
wherein the NDPA information is received on a NDPA frame, and
wherein the NDPA frame includes a sounding token field for identifying a format of the NDPA frame,
wherein the spatial resource information includes an index of at least one spatial stream to be used for the UL transmission of the NDP frame.

Assignees

• Lg Electronics Inc

Inventors

• Chun Jinyoung
• Ryu Kiseon
• Lim Dongguk
• Lee Wookbong
• Choi Jinsoo
• Cho Hangyu
• Park Eunsung

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/542

  using measured or perceived quality · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04W72/046

  the resource being in the space domain, e.g. beams · CPC title