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Method and device for sending/receiving null data packet declaration frame

A technology of empty data packets and spatial streams, which is applied in the field of communication and can solve problems such as not proposing EHTNDPA frames

Pending Publication Date: 2021-12-03
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, no design scheme of EHT NDPA frame has been proposed to support channel detection with larger bandwidth and more streams, and to enable STA to distinguish different variants of NDPA frames

Method used

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  • Method and device for sending/receiving null data packet declaration frame
  • Method and device for sending/receiving null data packet declaration frame
  • Method and device for sending/receiving null data packet declaration frame

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Embodiment Construction

[0058] Embodiments of the present application are described below with reference to the drawings in the embodiments of the present application.

[0059] The transmission bandwidth and number of spatial streams allowed by each WLAN standard

[0060] WLAN starts from 802.11a / g, has gone through 802.11n, 802.11ac, 802.11ax, and now 802.11be. The allowed transmission bandwidth and the number of spatial streams are shown in Table 1 below:

[0061] Table 1

[0062]

[0063] Among them, the 802.11n standard is also called high throughput (high throughput, HT); and for the standards before HT, such as 802.11a / b / g, etc., are collectively called non high throughput (non high throughput, Non-HT); 802.11 The ac standard is also called VHT; the 802.11ax standard is also called HE; the 802.11be standard is also called EHT. Among them, 80211b adopts non-orthogonal frequency division multiplexing (OFDM) mode, so it is not listed in Table 1.

[0064] 802.11ac channel detection proces...

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Abstract

The invention discloses a method and a device for sending / receiving a null data packet declaration frame. The AP sends an NDPA frame, first indication information in a detection dialogue token of the AP is used for indicating that the NDPA frame is EHT detection or HE detection, and a first bit of a first site information field of the AP comprises second indication information used for indicating that the first site information field corresponds to an EHT site or an HE site. The STA identifies the EHT station corresponding to the information field of the first station according to the first indication information and the second indication information, performs EHT detection, acquires channel state information of Nc spatial streams, and feeds back the channel state information to the AP. According to the NDPA frame structure provided by the invention, the STA can accurately identify that the NDPA frame is EHT detection, and EHT detection is carried out.

Description

technical field [0001] The present application relates to the field of communication technologies, and in particular to a method and device for sending / receiving null data packet announcement (null data packet announcement, NDPA) frames in a wireless local area network (wireless local area network, WLAN). Background technique [0002] In a wireless system such as WLAN, an access point (access point, AP) needs to obtain channel state information (channel state information, CSI) for beamforming (beamforming, BF), rate control, resource allocation, etc. In WLAN, the process of obtaining channel state information is called channel sounding. [0003] In the channel detection process of 802.11ac (also known as very high throughput (VHT)), the AP (as the initiator of the channel detection, called beamformer, referred to as BFer) sends an NDPA frame to notify the user that needs to perform channel detection. STA (as a responder of channel detection, called beamformee, BFee for shor...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04L1/00
CPCH04W72/0453H04L1/0023H04B7/0626H04L1/0026H04L1/06
Inventor 刘辰辰于健梁丹丹张美红淦明
Owner HUAWEI TECH CO LTD
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