KR-102962342-B1 - Channel sounding method and device

KR102962342B1KR 102962342 B1KR102962342 B1KR 102962342B1KR-102962342-B1

Abstract

The present application provides a channel sounding method and apparatus. The method comprises: a first communication device transmitting a first frame to a second communication device, wherein the first frame is used to instruct the second communication device to perform channel sounding on some of the antennas of the first communication device. The first communication device transmits a second frame to the second communication device, wherein the second frame is used to perform channel sounding on some of the antennas by the second communication device. The first communication device receives a third frame from the second communication device, wherein the third frame is used to indicate the result of performing channel sounding on some of the antennas. Based on the technical solution described above, the first communication device may indicate to the second communication device a set of antennas for which channel measurements need to be performed, instead of performing channel sounding on all antennas and feeding back the channel sounding results. This can reduce channel state information feedback overheads.

Inventors

옌, 중장
양, 마오
량, 단단
위, 젠
리, 윈보
간, 밍

Assignees

후아웨이 테크놀러지 컴퍼니 리미티드

Dates

Publication Date: 20260511
Application Date: 20210222
Priority Date: 20200302

Claims (20)

As a channel sounding method, A step of transmitting a first frame to a second communication device by a first communication device—the first frame is used to indicate an antenna set including some of the antennas of the first communication device for the second communication device to perform channel sounding—; A step of transmitting a second frame to a second communication device by the first communication device—the second frame is used by the second communication device to perform channel sounding for the antenna set—; and A channel sounding method comprising the step of receiving a third frame from a second communication device by the first communication device, wherein the third frame is used to display the result of performing channel sounding on the antenna set.
In paragraph 1, Before the step of receiving a third frame from the second communication device by the first communication device, the method is: A channel sounding method further comprising the step of transmitting a fourth frame to the second communication device by the first communication device, wherein the fourth frame is used to instruct the second communication device to transmit the third frame to the first communication device.
In paragraph 1, Before the step of transmitting a first frame to a second communication device by a first communication device, the method is: A step of transmitting a training frame to the second communication device by the first communication device—the training frame is used to perform channel sounding for all antennas of the first communication device—; A step of receiving a feedback frame from the second communication device by the first communication device; and A channel sounding method further comprising the step of determining the antenna set based on the feedback frame by the first communication device.
In paragraph 3, Before the step of transmitting a training frame to the second communication device by the first communication device, the method is: A channel sounding method further comprising the step of transmitting a pre-training frame to the second communication device by the first communication device, wherein the pre-training frame is used to instruct the second communication device to perform channel sounding for all antennas of the first communication device.
In paragraph 3, Before the step of receiving a feedback frame from the second communication device by the first communication device, the method is: A channel sounding method further comprising the step of transmitting a trigger frame to the second communication device by the first communication device, wherein the trigger frame is used to instruct the second communication device to transmit the feedback frame to the first communication device.
In paragraph 1, A channel sounding method in which the first frame includes a first field, the first field is used to display a portion of the panels of the first communication device, and the antenna set includes an antenna corresponding to the portion of the panels.
In paragraph 1, A channel sounding method in which the first frame includes a first field, the first field is used to carry an antenna index, and the antenna index is used to indicate the antenna set.
In paragraph 6, A channel sounding method in which the first frame further includes a second field, and the second field is used to indicate that the first field is used to display a part of the panels of the first communication device or to carry an antenna index.
In paragraph 1, The above first frame includes a third field, and the third field is a channel sounding method used to indicate that the first frame is a frame of an ultra-high throughput EHT variant.
In paragraph 1, The first frame is a null data packet announcement (NDPA) frame, the first frame includes a third field, and the third field includes a standard control field; When the value of the above standard control field is 00, this indicates that the first frame is a frame of a very high throughput (VHT) variant; When the value of the above standard control field is 01, this indicates that the first frame is a high-efficiency (HE) variant frame; When the value of the above standard control field is 10, this indicates that the first frame is a frame of a ranging deformation; or A channel sounding method in which, when the value of the above standard control field is 11, this indicates that the first frame is an ultra-high throughput (EHT) variant frame.
In paragraph 1, A channel sounding method wherein the second frame comprises an ultra-high throughput (EHT) signal field, an EHT short training field, and an EHT long training field, the antenna set corresponds to at least two antenna panels, the second frame comprises at least two second subframes, and the EHT long training field in the second subframe comprises a long training field of an antenna corresponding to one of the at least two antenna panels.
As a channel sounding method, A step of receiving a first frame from a first communication device by a second communication device—the first frame is used to indicate an antenna set including a portion of the antennas of the first communication device for the second communication device to perform channel sounding—; A step of receiving a second frame transmitted by the first communication device by the second communication device—the second frame is used by the second communication device to perform channel sounding for the antenna set—; A step of performing channel sounding for the antenna set based on the second frame by the second communication device; and A channel sounding method comprising the step of transmitting a third frame to the first communication device by the second communication device, wherein the third frame is used to display the result of performing channel sounding on the antenna set.
In Paragraph 12, Before the step of transmitting a third frame to the first communication device by the second communication device, the method is: A channel sounding method further comprising the step of receiving a fourth frame transmitted by the first communication device by the second communication device—the fourth frame is used to instruct the second communication device to transmit the third frame to the first communication device.
In Paragraph 12, Before the step of receiving a first frame from a first communication device by a second communication device, the method is: A step of receiving a training frame from the first communication device by the second communication device—the training frame is used to perform channel sounding for all antennas of the first communication device—; and A channel sounding method further comprising the step of transmitting a feedback frame to the first communication device by the second communication device, so that the first communication device determines the antenna set based on the feedback frame.
In Paragraph 14, Before the step of receiving a training frame from the first communication device by the second communication device, the method is: A channel sounding method further comprising the step of receiving a pre-training frame transmitted by the first communication device by the second communication device, wherein the pre-training frame is used to instruct the second communication device to perform channel sounding for all antennas of the first communication device.
In Paragraph 14, Before transmitting a feedback frame to the first communication device by the second communication device, the method is: A channel sounding method further comprising the step of receiving a trigger frame from the first communication device by the second communication device, wherein the trigger frame is used to instruct the second communication device to transmit the feedback frame to the first communication device.
In Paragraph 12, A channel sounding method in which the first frame includes a first field, the first field is used to display a portion of the panels of the first communication device, and the antenna set includes an antenna corresponding to the portion of the panels.
In Paragraph 12, A channel sounding method in which the first frame includes a first field, the first field is used to carry an antenna index, and the antenna index is used to indicate the antenna set.
In Paragraph 17, A channel sounding method in which the first frame further includes a second field, and the second field is used to indicate that the first field is used to display a part of the panels of the first communication device or to carry an antenna index.
In Paragraph 12, The above first frame includes a third field, and the third field is a channel sounding method used to indicate that the first frame is an ultra-high throughput (EHT) variant frame.

Description

Channel sounding method and device This application claims priority to Chinese patent application No. 202010135651.7, filed with the China National Intellectual Property Administration on March 2, 2020, with the title of the invention "CHANNEL SOUNDING METHOD AND APPARATUS", the entirety of which is incorporated herein by reference. This application relates to the field of communications, and more specifically, to a channel sounding method and apparatus. The IEEE (Institute of Electrical and Electronics Engineers) 802.11 standard discusses the next-generation extremely high throughput (EHT) working group for IEEE 802.11ax and considers introducing larger bandwidth (e.g., 320 MHz) and more streams (e.g., 16 spatial streams) in next-generation wireless local area networks (WLANs). For EHT, throughput must be improved by increasing the number of spatial streams. However, due to the limitations of wireless device capabilities, a single access point (AP) can barely provide 16 spatial streams. To address the aforementioned problems, Multi-Panel Multiple Input Multiple Output (MP MIMO) technology has emerged. MP MIMO means that wireless devices (e.g., base stations in cellular networks, APs in WLANs, or terminal devices) are formed by interconnecting multiple panels. A series of transceiver antennas are mounted on each panel. In other words, the antenna resources of a single wireless device are distributed across multiple panels that are either close to or far apart from each other. MP MIMO can reduce the deployment cost and complexity of multiple antennas and improve scalability, network coverage capabilities, and MIMO channel gain. MP MIMO provides a feasible solution for the use of more streams or antenna resources in next-generation WLANs. However, regardless of whether antenna resources are centralized or located on multiple panels, the technical prerequisite for utilizing MIMO technology in WLANs is the channel sounding process. That is, an AP can serve one or more stations (STAs) via MIMO using multiple antennas only after a non-AP station (non-AP STA) has completed channel sounding with the AP and fed back the channel sounding results. As larger bandwidths and more spatial streams are introduced, more channel state feedback information is required. This causes higher feedback overheads. Therefore, reducing channel state information feedback overheads becomes an urgent problem that needs to be solved. FIG. 1 is a schematic diagram of the architecture of a wireless communication system applicable to an embodiment of the present application; FIG. 2 is a drawing of the internal structure of an AP according to an embodiment of the present application; FIG. 3 is a drawing of the internal structure of a STA according to an embodiment of the present application; FIG. 4 is a schematic diagram of single-user channel status information feedback in IEEE 802.11ax; FIG. 5 is a schematic diagram of multi-user channel status information feedback in IEEE 802.11ax; FIG. 6 is a schematic diagram of user channel state information feedback applicable to D-MIMO; FIG. 7 illustrates the frame structure of an NDPA frame; FIG. 8 illustrates the frame structure of an NDP frame; FIG. 9 illustrates the frame structure of a trigger frame; FIG. 10 illustrates the frame structure of a beamforming report frame; FIG. 11 is a schematic flowchart of a channel sounding method according to an embodiment of the present application; FIG. 12 illustrates an example of applying a channel sounding method according to an embodiment of the present application; FIG. 13 illustrates the frame structure of an NDPA frame according to an embodiment of the present application; FIG. 14 is a schematic diagram of the implementation of a station information field within an NDPA frame according to an embodiment of the present application; FIG. 15 is a schematic diagram of an implementation of an NDP frame according to an embodiment of the present application; FIG. 16 is a schematic diagram of another implementation of an NDP frame according to an embodiment of the present application; FIG. 17 is a schematic diagram of another implementation of an NDP frame according to an embodiment of the present application; FIG. 18 is a schematic diagram of a panel pre-training procedure according to an embodiment of the present application; FIG. 19 is a schematic diagram of an implementation of a training frame according to an embodiment of the present application; FIG. 20 illustrates the frame structure of a panel training trigger frame according to an embodiment of the present application; FIG. 21 illustrates the frame structure of a feedback frame according to an embodiment of the present application; FIG. 22 is a schematic diagram of an OFDMA-based panel pre-training procedure according to an embodiment of the present application; FIG. 23 is a schematic diagram of a MU MIMO-based panel pre-training procedure according to an embodiment of the present application; FIG. 24 i