WO2012149874A1

WO2012149874A1 - Method and device for sending control frame

Info

Publication number: WO2012149874A1
Application number: PCT/CN2012/074560
Authority: WO
Inventors: 韩志强; 邢卫民; 吕开颖
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-05-04
Filing date: 2012-04-23
Publication date: 2012-11-08
Also published as: CN102769925A; CN102769925B

Abstract

Disclosed is a method for sending a control frame, comprising: when measuring channel information, sending a control frame by using a specific queue category and/or a queue category obtaining a channel through competition. Also provided is a device for sending a control frame. By means of the technical solution of the present invention, a control frame can be sent when channel information is measured.

Description

Method and device for transmitting control frame

The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for transmitting a control frame. Background technique

Currently, wireless local area network (WLAN, Wireless Local Area) in the field of wireless networks

Networks) are growing rapidly, and the demand for WLAN coverage is growing, and the throughput requirements are getting higher and higher. In the IEEE 802.il group of the Institute of Electrical and Electronics Engineers Industry Standards, a series of standard WLAN technologies such as 802.11a, 802.11b, and 802.11g have been defined; subsequently, other task groups have emerged, focusing on the development of existing 802.11 technology improved specifications, such as the 802.11n task group proposed high throughput (High Throughput) requirements, capable of supporting data rates up to 600Mbps, the 802.11ac task group further proposed VHT (Very Good Throughput) The concept of increasing the data rate to 1 Gbps by introducing a larger channel bandwidth.

In the 802.11 task group, an access point (AP, Access Point) and multiple sites (STA, Station) associated with the AP form a basic service set (BSS, Basic Service Set). The 802.11 task group defines two modes of operation: Distributed Coordination Function (DCF) and Point Coordination Function (PCF), and improvements to these two modes of operation, namely enhanced distributed Coordinated Access (EDCA) and Hybrid Coordination Controlled Channel Access (HCCA). Among them, DCF is the most basic mode of operation, using the carrier sense multiple access with collision avoidance (CSMA/CA, CSMA with Collision Avoidance) mechanism to enable multiple sites to share wireless channels; EDCA is an enhanced mode of operation, Map upper-level data to four different queue classes 'J (AC, Access Categories): AC VO (AC-Voice), AC VI (AC-Video), AC BE (AC BestEffort), AC BK (AC Background); each queue category uses a different competing channel The parameters are used to prioritize. EDCA using CSMA / CA mechanism, a plurality of different priority queues shared wireless channel, and a reservation transmission opportunity (TXOP, Transmission Opportunity) ₀ substantially different priority queues during a transmission opportunity is obtained: When each queue channel is idle, Use different backoff intervals plus any contention backoff window to access the channel to reduce collisions.

In the prior art, Multiple Input Multiple Output (MIMO) is introduced to improve system performance. In order to ensure reliable and efficient data transmission, the initiator needs to measure the channel conditions of one or more receivers, and configure transmission parameters according to the measured channel information.

1 is a schematic flowchart of channel information feedback in the prior art. As shown in FIG. 1, a new frame exchange sequence is defined for performing channel information measurement, specifically: a channel information measurement side is sent to notify that a channel needs to be transmitted. The null data packet announcement frame (NDPA, Null Data Packet Announcement) of the information feedback site, and sends a zero data packet (NDP, Null Data Packet) after the short interframe space (SIFS, Short Interframe Space) at the end of NDPA transmission, default NDPA The first channel information feedback party indicated in the screen returns the channel feedback information (Sounding Feedback) after receiving the SIFS of the NDPA and the NDP. If there are multiple channel feedback parties, in addition to the first feedback default feedback, other channel information feedback parties need to feed back the channel information according to the sounding Poll of the channel information.

In the prior art, the management frame is specified to be sent using the AC-VO queue class. When the request to send (RTS, Request To Send) or clear to send (CTS, Clear To Send) is used as the first frame of the frame exchange sequence, the RTS or The CTS shall inherit the queue used by subsequent data in the same frame exchange sequence. However, when channel information measurement is introduced, the prior art does not specify a queue used for a notification frame (e.g., NDPA) for channel information measurement. Summary of the invention

In view of the above, it is a primary object of the present invention to provide a method and apparatus for transmitting a control frame capable of transmitting a control frame when performing channel information measurement.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

The present invention provides a method for transmitting a control frame, including:

When making channel information measurements, control frames are sent using a specific queue class and/or a queue class that competes for the channel.

In the above method, the control frame is a first frame in a multi-frame exchange sequence for performing channel information measurement and channel information reporting; and the control frame is used as a notification frame for notifying a channel information feedback party.

In the above method,

The specific queue category is: a predefined queue category, or using the same queue category as the radio frame of the subsequent channel information measurement report to be received;

The transmitting the control frame using a particular queue class is: independently using a particular queue class for channel contention, transmitting a control frame on the channel that is contending, or transmitting a control frame using a particular queue class that has contend for the channel.

In the above method,

The use of the queue type transmission control frame that competes to the channel is: a subsequent queue type of data to be sent or a queue type in which the management frame is located, a control frame, or non-associated data or management on the channel that is contending The queue class in which the frame is located competes for the channel, and the control frame is transmitted on the channel that is contending.

In the above method, the method further includes:

When performing channel information measurement and channel information reporting, other radio frames belonging to the same sender as the control frame use the same queue type as the control frame;

The same queue class as the control frame is used when performing other frame exchanges before performing channel information measurement and channel information reporting. In the above method, the sending the control frame by using a specific queue category is:

Pre-defined AC—VO is the queue class for transmitting null data announcement frame (NDPA); when the access point (AP) does not have channel information of some stations in the basic service set (BSS) or the channel information of the measured station has expired , queue class AC—VO competing channel;

The AP transmits NDPA on the channel to which the queue type AC-VO is contending, and performs channel information measurement of the station.

In the above method, the sending the control frame by using a specific queue category is:

Pre-defined AC-VI is the queue category for transmitting NDPA;

When the AP's queue type AC-VI has the data of the target station STA1, the queue category AC-VI competes for the channel;

After the queue class AC-VI contends to the channel, the AP does not have the channel information of the target station STA1, and transmits NDPA on the channel that the queue type AC-VI contends, and performs channel information measurement of the target station STA1.

In the above method,

The method further includes: transmitting the target site on a channel that is contending with the queue class AC-VI

STA1 data;

After the data of the target station STA1 is sent on the channel that is queued by the queue type AC-VI, the method further includes: the AP sends the NDPA by using the queue type AC-VI, and performs channel information measurement of other stations.

Pre-defined AC-VO is the queue category of the channel information feedback frame, and the queue category of NDPA is not predefined;

When the AP's queue class AC-VO has the data of the target station STA1, the queue class AC VO competes for the channel;

After the queue class AC—VO competes for the channel, the AP does not have the channel information of the target station STA1. At the time, the NDPA is transmitted on the channel that is contending with the queue class AC-VO, and the channel information measurement of the target station STA1 is performed.

In the above method, the method further comprises: transmitting the data of the target station STA1 on the channel that is contending with the queue class AC-VO.

In the above method, the use of the queue type transmission control frame that competes to the channel is:

When the AP's queue class AC-BE contends to the channel, and the AP does not have the channel information of the target station STA1 or the measured channel information of the target station STA1 has expired, the AP sends the NDPA using the queue type AC-BE that competes to the channel. Channel information measurement of the target station STA1 is performed.

In the above method,

The method further includes: transmitting data of the target station STA1 using a queue class AC-VI that competes to the channel;

After the use of the queue type AC-VI of the channel to the destination station STA1, the method further includes: the AP sends the NDPA using the queue type AC-VI that competes to the channel, and performs channel information measurement of other stations.

In the above method, the use of the queue type transmission control frame that competes to the channel is: in the queue category AC_VO of the AP, there is a management frame of the target station STA1, and the queue type AC_VO of the AP competes to the channel, when the AP When the channel information STA1 of the target station or the measured channel information of the target station STA1 has failed, the AP transmits the NDPA using the queue type AC-VO competing to the channel before the management frame transmission, and performs channel information measurement of the target station STA1.

In the above method, the using the queue type to be transmitted to the channel to send the control frame is: when the AP's queue type AC-VI has the data of the target station STA1, and the queue type AC VO has the data of the target station STA2, and the queue In the category AC-BK, there is data of the target station STA3, and the data of STA1, STA2, and STA3 needs to be packed, but when the channel information of STA1 and STA2 or the channel information of STA1 and STA2 has expired, in the queue class After the 'J AC-VI competes to the channel, the AP sends the queue type AC-VI that is competitive to the channel.

NDPA, performs channel information measurement of STA1 and STA2.

When there is data of the target station AP in the queue type AC_VO of STA1, after the queue type AC_VO of STA1 competes for the channel, STA1 sends NDPA using the queue type AC-VO that competes to the channel before data transmission. Channel information measurement of the AP.

In the above method, the use of the queue type transmission control frame that competes to the channel is: In the independent BSS (IBSS), the STA1 queue type AC_VO has a target station

For the STA2 data, after the queue type AC_VO of the STA1 competes for the channel, the STA1 transmits the NDPA using the queue type AC-VO that competes to the channel before the data transmission, and performs channel information measurement of the STA2.

In the above method, the sending of the control frame using the specific queue type and the queue type that competes to the channel is:

The AC-VO is pre-defined as the queue class for transmitting NDPA, and the AP uses the AC-VO queue class to measure the channel information of the STAs;

When the queue class AC-VI has the data of the target site as STA1, and the queue class AC-VI competes for the channel, if the AP does not have the channel information of STA1 or the measured channel information of STA1 has expired, the AP before the data transmission The NDPA is transmitted using the queue class AC-VI that competes to the channel, and the channel information measurement of STA1 is performed.

The present invention also provides a transmitting device for controlling a frame, wherein the transmitting device of the control frame is configured to transmit a control frame using a specific queue type and/or a queue type that competes to the channel when performing channel information measurement.

In the transmitting apparatus of the control frame, the control frame is a first frame in a multi-frame exchange sequence for performing channel information measurement and channel information reporting; and the control frame is used as a notification frame for notifying a channel information feedback party. In the transmitting device of the above control frame,

The specific queue class is a predefined queue class, or uses the same queue class as the radio frame of the subsequent channel information measurement report to be received;

In the transmitting device of the above control frame,

The method and device for transmitting a control frame provided by the present invention can transmit a control frame using a specific queue type and/or a queue type that competes to a channel when performing channel information measurement, and can implement control as a notification frame in performing channel information measurement. The transmission of the frame compensates for the gap of the queue used in the prior art which does not specify a notification frame for channel information measurement. DRAWINGS

1 is a schematic flow chart of channel information feedback in the prior art;

2 is a schematic flowchart of Embodiment 1 of a method for transmitting a control frame according to the present invention; FIG. 3 is a schematic flowchart of Embodiment 2 of a method for transmitting a control frame according to the present invention; FIG. 4 is a schematic diagram of a method for transmitting a control frame according to the present invention. FIG. 5 is a schematic flowchart of Embodiment 4 of a method for transmitting a control frame according to the present invention. detailed description

The basic idea of the invention is: When performing channel information measurements, control frames are transmitted using a particular queue class and/or a queue class that competes to the channel. The invention will be further described in detail below with reference to the drawings and specific embodiments.

The present invention provides a method for transmitting a control frame, the method comprising: transmitting a control frame using a specific queue class and/or a queue class that competes to a channel when performing channel information measurement.

Wherein, sending a control frame by using a specific queue type means that a control frame must be sent using a predefined queue type, that is, a control frame is sent using a fixed queue type; and using a queue type that competes to the channel to send a control frame refers to a channel actually In the competition, the control frame is transmitted using the queue type that competes to the channel, so the queue type for transmitting the control frame is not fixed.

The control frame refers to a first frame in a multi-frame exchange sequence for performing channel information measurement and channel information reporting, and the control frame is a notification frame for notifying a channel information feedback party; performing channel information measurement and channel information. In other words, other radio frames belonging to the same sender as the control frame use the same queue class as the control frame, where other radio frames may be Sounding Poll frames.

The specific queue type is a pre-defined queue category of the wireless local area network system, or the specific queue category uses the same queue type as the radio frame of the subsequent channel information measurement report to be received;

The control frame is sent using a specific queue class as: Channel competition is performed independently using a specific queue class, a control frame is transmitted on the channel that is contending, or a control frame is transmitted using a specific queue class that has been contending to the channel; here, when the queue class When there is no other data waiting for transmission, the specific queue class may be used independently for channel competition, and the control frame is sent on the channel that is contending; when there is other data transmission in the channel, the channel is actually used by the specific queue type. Strive to send control frames on the channel that is being contending.

The use of the queue type transmission control frame that competes to the channel is: a subsequent queue type of data to be sent or a queue type in which the management frame is located, a control frame, or non-associated data or management on the channel that is contending The queue type in which the frame is located competes for the channel, and sends a control frame on the channel that is contending; wherein, the data or management frame to be sent subsequently refers to the data or management frame to be sent. The target site is the same as the target site for channel information measurement; the non-associated data or management frame means that the target site of these data or management frames is different from the target site for channel information measurement. For example, after transmitting the data of the A site, there is still time for the channel information measurement of the B site, and the channel information measurement of the B site can be performed at this time.

Here, before performing other frame exchanges before performing channel information measurement and channel information reporting, the same queue type as the control frame is used, and other frames may be RTS, CTS, and the like.

Embodiment 1

2 is a schematic flowchart of Embodiment 1 of a method for transmitting a control frame according to the present invention. In this embodiment, there are three sites in a BSS: AP, STA1, and STA2, and the method includes the following steps:

Step 201: The AP pre-defines the queue type AC_VO as a queue type for transmitting NDPA. Step 202: When there is no service between the three stations in a certain period of time, the AP does not have the channel information of STA1 and STA2 or the measured channel information of STA1 and STA2 has expired, and the queue type AC_VO competes for the channel.

Step 203: The AP sends the NDPA on the channel that is contending with the queue type AC-VO, and performs channel information measurement of STA1 and STA2.

Specifically, after the channel is competed, the NDPA is sent on the channel that is queued by the queue type AC-VO, and is used for performing channel information measurement of STA1 and STA2; here, the subsequent Sounding Poll frame uses the same queue as the NDPA. Category; In order to make the data transmission within the TXOP more reliable, the RTS or CTS can be sent before the channel information measurement, and the RTS or CTS uses the same queue class AC-VO as the NDPA.

Embodiment 2

FIG. 3 is a schematic flowchart of Embodiment 2 of a method for transmitting a control frame according to the present invention. In this embodiment, there are six sites in a BSS: an AP and five STAs, and the method includes the following steps: In step 301, the queue type AC-VI is predefined to be a queue category for transmitting NDPA. Step 302: When there is no service between the AP and each station in a certain period of time, if the channel information or channel information of each STA is not invalid, the queue category AC-VI competes for the channel.

Step 303: The AP sends the NDPA on the channel that is queued by the queue type AC-VI, and performs channel information measurement at five sites.

Specifically, after the channel is competed, the NDPA is sent on the channel that is queued by the queue class AC-VI, and is used for channel information measurement of five stations; here, the subsequent Sounding Poll frame uses the same queue as the NDPA. Category, but only three channels of information can be measured in one TXOP, and subsequent channel information is measured from the Sounding Poll in the next TXOP, and both the Sounding Poll in the two TXOPs and the NDPA in the first TXOP are used. The same queue class; In order to make the data transmission in the TXOP more reliable, the RTS or CTS can be sent before the channel information measurement, and the RTS or CTS uses the same queue class as the NDPA and the other 'J AC-VI.

Embodiment 3

4 is a schematic flowchart of Embodiment 3 of a method for transmitting a control frame according to the present invention. In this embodiment, there are three sites in a BSS: AP, STA1, and STA2, and the method includes the following steps:

Step 401: The AP pre-defines the queue category AC-VI as a queue category for transmitting NDPA. Step 402: The AP's queue type AC-VI has the data of the target station STA1, and the queue type another 'j AC VI competes for the channel. When the AP does not have the channel information of the target station STA1, the queue type AC-VI is used to compete. The NDPA is sent on the channel to perform channel information measurement of the target station STA1;

Specifically, the AP's queue class AC-VI has the data of the target station STA1, and the queue class AC-VI competes for the channel; after the queue class AC-VI competes for the channel, if the AP has the channel information of the target station STA1 , you can directly use the channel in the queue category AC-VI Sending data of the target station STA1;

If the AP does not have the channel information of the target station STA1, it may first send the NDPA on the channel that is contending with the queue class AC VI, perform the channel information measurement of the target station STA1, and then use the queue type AC-VI to compete on the channel. Send the data of the target station STA1.

Step 403: Send NDPA using the queue type AC-VI to perform channel information measurement of STA2.

Specifically, after the data of the STA1 is transmitted, if there is sufficient time for the channel information measurement of the STA2, the AP may use the queue type AC-VI to send the NDPA for performing channel information measurement of the STA2.

Embodiment 4

FIG. 5 is a schematic flowchart of Embodiment 4 of a method for transmitting a control frame according to the present invention. In this embodiment, there are three sites in a BSS: AP, STA1, and STA2, and the method includes the following steps:

Step 501: The AP pre-defines the queue type AC—VO is the queue class of the channel information feedback frame, and the queue category of the NDPA is not predefined.

Step 502, the queue type AC-VO competes for the channel. When the AP does not have the channel information of the target station STA1, the NDPA is sent on the channel that is queued by the queue type AC-VI, and the channel information of the target station STA1 is measured.

Specifically, the AP's queue class AC_VO has the data of the target station STA1, and the queue class AC-VO competes for the channel; after the queue class AC-VO is used to compete to the channel, if the AP has the channel information of the target station STA1 , the data of the target station STA1 can be directly sent on the channel that the queue type AC-VO is used to compete;

If the AP does not have the channel information of the target station STA1, it may first transmit the NDPA on the channel that is contending with the queue class AC VO, perform channel information measurement of the target station STA1, and then use the channel category AC-VO to compete for the channel. Number of destination stations STA1 sent on According to.

Step 503: Send NDPA by using the same queue class AC_VO as the channel information feedback frame, and perform channel information measurement of STA2.

Specifically, after the data of the STA1 is transmitted, if there is sufficient time for the channel information measurement of the STA2, the AP may use the same queue type AC_VO as the channel information feedback frame because the queue type for transmitting the NDPA is not defined in advance. Send NDPA for channel information measurement of STA2.

The above-described Embodiments 1 to 4 are for the case of transmitting a control frame using a specific queue type.

Embodiment 5

For example, in a BSS, there are any multiple STAs in the STA, and there is data of the target station STA1 in the queue category AC-BE of the AP;

The AP's queue class AC-BE competes for the channel, but the AP does not have the channel information of STA1 or the measured channel information of STA1 has expired, so the AP is able to make the data with a suitable modulation and coding scheme (MCS, Modulation and Coding). Scheme, optionally, before the data transmission, the AP sends an NDPA using the queue type AC-BE that competes to the channel for performing channel information measurement of STA1;

According to the measured channel information of STA1, the appropriate MCS transmission data is selected; in order to make the data transmission in the TXOP more reliable, the RTS or CTS can be sent before the channel information measurement, and the same queue as the NDPA is used when the RTS or CTS is sent. Category AC - BE.

Embodiment 6

For example, in a BSS, there are three sites: AP, STA1, and STA2. In the AP's queue category AC-VI, there is data of the target site STA1, and the AP does not have STA2 data.

When the queue class AC-VI contends to the channel, if the AP has the channel information of STA1, the STA1 data can be transmitted using the queue class AC-VI that competes to the channel; if the AP does not have The channel information of the STA1, the AP may first send the NDPA using the queue type AC-VI that competes to the channel, and is used for performing channel information measurement of STA1, and then transmitting the data of STA1;

After the STA1 data transmission is completed, if there is enough time for the STA2 channel information measurement, the AP may use the queue type AC-VI that competes to the channel to send the NDPA for performing STA2 channel information measurement.

Example 7

For example, in a BSS, there are any multiple stations STAs. In the AP's queue class AC_VO, there is a management frame of the target station STA1, and the AP's queue class AC_VO competes for the channel, but the AP does not have the channel information of STA1. Or the measured channel information of STA1 has expired, so in order to enable the data to be transmitted by a suitable MCS, the AP can selectively send the NDPA using the queue type AC-VO that competes to the channel before the management frame transmission. Channel information measurement of STA1; and then selecting an appropriate MCS transmission management frame according to the measured channel information of STA1; in order to make the management frame transmission in the TXOP more reliable, the RTS or CTS may be sent before the channel information measurement, and the RTS or the RTS may be sent. In CTS, the same queue class AC_VO as NDPA is used.

Example eight

For example, in a BSS, there are any multiple stations STAs, the queue category AC-VI of the AP has the data of the target station STA1, and the queue category AC_VO has the data of the target station STA2, and the queue category AC-BK There is data of the target station STA3;

When the AP's queue class AC-VI competes for the channel, the data of STA1, STA2, and STA3 needs to be packed and sent out using Multi-user Multiple Input (Multi-user Multiple Input). However, the channel information of STA1 and STA2 or the channel information of STA1 and STA2 has failed. The channel information of STA3 or the channel information of STA3 is not invalid. Therefore, in order to ensure reliable transmission of data, only the channels of STA1 and STA2 can be performed before data transmission. Information measurement

The NDPA sent by the AP using the queue class AC-VI that competes to the channel is used to perform STA1. And the channel information measurement of STA2; the subsequent Sounding Poll frame is also used to contend to the channel type AC-VI; in order to make the data transmission in the TXOP more reliable, the RTS or CTS can be sent before the channel information measurement, and the RTS or CTS is sent. When using the same queue class AC-VI as NDPA.

Example nine

For example, in the BSS, STA1's queue class AC_VO has the target site as the AP data, STA1's queue class AC_VO competes to the channel, but STA1 does not have the AP's channel information or the measured AP's channel information has been Invalid, so in order to enable the data to be transmitted in a suitable MCS, the STA1 can transmit the NDPA using the queue type AC-VO that competes to the channel before the data transmission, for performing channel information measurement of the AP;

According to the channel information of the measured AP, select the appropriate MCS transmission data; in order to make the data transmission in the TXOP more reliable, the RTS or CTS may be sent before the channel information measurement, and when the RTS or CTS is sent, the same as the NDPA is used. Queue category AC—VO.

Example ten

For example, in a standalone BSS (IBSS, Independent BSS), STAl's queue category

In the AC VO, there is data of the STA2 in the target station, and the queue type AC_VO of STA1 competes for the channel, but the channel information of STA1 without STA2 or the channel information of the measured STA2 has expired, so STA1 can make the data suitable. For the MCS transmission, the NDPA may be sent using the queue class AC-VO that competes to the channel before the data transmission, for performing channel information measurement of STA2;

According to the measured channel information of STA2, the appropriate MCS transmission data is selected; in order to make the data transmission in the TXOP more reliable, the RTS or CTS may be sent before the channel information measurement, and when the RTS or CTS is sent, the same as the NDPA is used. Queue category AC—VO.

The fifth to tenth embodiments described above are for the case where a control frame is transmitted using the queue type that is contending. Embodiment 11

For example, in a BSS, there is one AP and twenty STAs, and the AC-V0 is pre-defined as the queue class for transmitting NDPA; the AP-cycle uses the AC-VO queue class to measure the channel information of the STAs, at a certain moment, the queue In the category AC-VI, the target station is STA1 data, the queue class AC-VI competes to the channel; the AP does not have the channel information of STA1 or the measured channel information of STA1 has expired, and the AP is able to make the data a suitable MCS. Transmission, optionally transmitting NDPA using the queue class AC-VI competing to the channel before data transmission, for performing channel information measurement of STA1;

According to the measured channel information of STA1, the appropriate MCS transmission data is selected; in order to make the data transmission in the TXOP more reliable, the RTS or CTS can be sent before the channel information measurement, and when the RTS or CTS is sent, the same as the NDPA is used. Queue category AC—VI.

The eleventh embodiment is for transmitting the control according to the specific queue type and the queue type that is used to achieve the above method. The present invention further provides a control device for transmitting a control frame, and the transmitting device of the control frame is configured to perform channel information measurement. Control frames are sent using a particular queue class and/or a queue class that competes for the channel.

The control frame is a first frame in a multi-frame exchange sequence for performing channel information measurement and channel information reporting, and is used as a notification frame for notifying a channel information feedback party.

The specific queue category is a predefined queue category, or the specific queue category uses the same queue category as the radio frame of the subsequent channel information measurement report to be received;

The use of the queue type transmission control frame that is competitive to the channel is: a subsequent queue type of the data to be transmitted or a queue type in which the management frame is located, and a control frame is transmitted on the channel that is contending, or a non-phase The associated data or the queue type in which the management frame is located competes for the channel, and the control frame is transmitted on the channel that is contending.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included. Within the scope of protection of the present invention.

Claims

Claim

A method for transmitting a control frame, the method comprising:

2. The method of claim 1 wherein

The control frame is a first frame in a multi-frame exchange sequence for performing channel information measurement and channel information reporting;

The control frame serves as a notification frame for notifying the channel information feedback party.

3. The method of claim 1 wherein:

4. The method of claim 1 wherein:

The method according to claim 2, further comprising: when the channel information measurement and the channel information report are performed, other radio frames belonging to the same sender as the control frame, use and The same queue category as the control frame;

The same queue class as the control frame is used when performing other frame exchanges before performing channel information measurement and channel information reporting.

The method according to any one of claims 1 to 3, characterized in that The queue control class sends control frames to:

The method according to any one of claims 1 to 3, wherein the transmitting the control frame using a specific queue type is:

Pre-defined AC-VI is the queue category for transmitting NDPA;

After the queue class AC-VI competes for the channel, the AP does not have the channel information of the target station STA1, and transmits NDPA on the channel that is queued by the queue type AC-VI, and performs channel information measurement of the target station STA1.

8. The method of claim 7 wherein:

The method further includes: transmitting data of the target station STA1 on a channel that is contending with the queue class AC-VI;

When the AP's queue class AC—VO has the data of the target station STA1, the queue category AC VO competition channel;

After the AC-VO competes for the channel, if the AP does not have the channel information of the target station STA1, it transmits NDPA on the channel that the queue type AC-VO is contending for, and performs channel information measurement of the target station STA1.

10. The method according to claim 9, wherein the method further comprises: transmitting data of the target station STA1 on a channel that is contending with the queue class AC-VO.

11. The method according to claim 1, 2 or 4, wherein the using the queue type of the contention to the channel to send the control frame is:

12. The method of claim 11 wherein:

The method according to claim 1, 2 or 4, wherein the use of the queue type transmission control frame that competes with the channel is:

In the queue class AC_VO of the AP, there is a management frame of the target station STA1, and the queue class AC_VO of the AP competes to the channel. When the AP does not have the channel information STA1 of the target station or the measured channel information of the target station STA1 has expired. When the AP transmits the NDPA using the queue type AC-VO that competes to the channel before the management frame transmission, the channel information measurement of the target station STA1 is performed.

14. The method according to claim 1, 2 or 4, characterized in that said use competition The control frame sent to the queue category of the channel is:

When there is data of the target station STA1 in the queue category AC_VI of the AP, and there is data of the target station STA2 in the queue category AC VO, and there is data of the target station STA3 in the queue category AC_BK, STA1, STA2 and STA3 are required. Data packing, but without the channel information of STA1 and STA2 or the channel information of STA1 and STA2 has expired, after the queue class 'J AC-VI competes to the channel, the AP uses the queue type AC that competes to the channel. — The VI sends NDPA to perform channel information measurement for STA1 and STA2.

16. The method according to claim 1, 2 or 4, wherein the using the queue type of the contention to the channel to send the control frame is:

In the independent BSS (IBSS), the STA1 queue class AC-VO has a target site

17. The method according to any one of claims 1 to 4, characterized in that said transmitting a control frame using a specific queue class and a queue class that competes to the channel is:

When the queue class AC-VI has the data of the target site as STA1, and the queue class AC-VI competes for the channel, if the AP does not have the channel information of STA1 or the measured channel information of STA1 has expired, the AP before the data transmission Send using the queue category AC-VI that competes to the channel NDPA, performs channel information measurement of STA1.

18. A transmitting apparatus for controlling a frame, characterized in that: the transmitting means of the control frame is configured to transmit a control frame using a specific queue type and/or a queue type that competes to a channel when performing channel information measurement.

19. The transmitting device according to claim 18, wherein

20. The transmitting device according to claim 18, wherein

21. The transmitting device according to claim 18, wherein