WO2019154188A1

WO2019154188A1 - Channel detection method and related apparatus

Info

Publication number: WO2019154188A1
Application number: PCT/CN2019/073680
Authority: WO
Inventors: 陈特彦; 淦明; 吴涛; 曹粔
Original assignee: 华为技术有限公司
Priority date: 2018-02-08
Filing date: 2019-01-29
Publication date: 2019-08-15
Also published as: CN110138421B; CN110138421A

Abstract

Provided are a channel detection method and a related apparatus. The channel detection method can comprise: a first device generating a physical protocol data unit (PPDU), wherein the PPDU contains a precoded data field and a non-precoded long training field; the first device sending the PPDU; and at least one second device receiving the PPDU and performing channel estimation according to the long training field so as to feed back channel information. It can be seen that compared with performing channel detection by sending zero data messages separately, the present application uses a PPDU containing a non-precoded long training field to perform channel detection so that the overhead of channel detection can be reduced.

Description

Channel detection method and related device

The present application claims priority to Chinese Patent Application No. 201,810,128, 864, filed on February 8, 2018, the entire disclosure of which is incorporated herein by reference. in.

Technical field

The present application relates to the field of communications technologies, and in particular, to a channel detecting method and related devices.

Background technique

Multiple Input Multiple Output (MIMO) technology can improve system throughput. For example, an access point configured with 4 antennas can transmit data for 3 stations simultaneously on the same channel through MIMO technology. The downlink data received by each node cannot be jointly processed. Therefore, the data sent by the access point to each station needs to be precoded and sent, so that each station only receives its own data. In order to obtain the precoding matrix of each station, the access point needs to know the channel information between the access point and the receiving antenna of each station. Therefore, a channel sounding process needs to be performed between the AP and each station, so that each The station performs channel estimation and feeds back channel information.

In the channel detection process, the access point first sends a zero data message notification message, which is used to notify each station that it is ready to receive the zero data message to be sent, and perform channel estimation according to the zero data message; Zero data message and specify the station that needs to feed back the channel information; thus, each station that performs channel estimation and is required to feed back the channel information can feed back the channel information to the access point, and if it is not specified, the channel information needs to be fed back. Each time the Beamforming Report-Poll is sent, the site separately feeds back the channel information. It can be seen that the overhead of the channel detection process is large, especially when there are many sites, the channel detection is frequent, which seriously affects the throughput of the system.

Summary of the invention

The embodiment of the present application provides a channel detection method and related apparatus, which may carry a long training field that is not precoded in a physical layer protocol data unit, so that each station can perform channel estimation according to the long training field, and separately send Compared with the way of zero data packets, the overhead of channel sounding can be reduced.

In a first aspect, the embodiment of the present application provides a channel detection method, in which a first device may generate a physical layer protocol data unit (PPDU), where the PPDU includes pre-coded data. a field and a long training field that is not precoded; the first device sends the PPDU, and the at least one second device performs channel estimation according to the long training field. The at least one second device is a device that is associated with the first device. For example, the first device may be an access point (AP), and the at least one second device may be a terminal device served by the access point. The PPDU may be a transmit beamforming physical layer protocol data unit, or may be a downlink multi-user multiple input multiple output physical layer protocol data unit. In this way, the physical layer protocol data unit of the first device can carry the long training field for channel estimation, and the channel detection overhead can be reduced compared with the channel detection procedure for separately transmitting the zero data message.

In a possible implementation manner, the PPDU further includes indication information, where the indication information is used to indicate whether the long training field is used for a target receiving station of a data field in the PPDU for channel estimation; or the indication The information is used to indicate whether the target receiving station of the data field in the PPDU performs channel estimation according to the long training field.

The indication information may also be used to indicate whether the PPDU includes a long training field that is not pre-coded. That is, the indication information may indicate whether the PPDU sent by the first device is a PPDU for sending data, or is used. The PPDU is also used to transmit data for channel estimation.

Wherein, when the long training field is used for channel estimation by the target receiving station of the data field in the PPDU, the at least one second device is included in the target receiving station; when the long training field is not used in the data in the PPDU When the target receiving station of the field performs channel estimation, the at least one second device is not included in the target receiving station. The target receiving station is a device indicated by device identification information in a physical layer header of the PPDU, that is, the target receiving station is a device designated to receive a data field portion of the PPDU.

It can be seen that the implementation manner may indicate that the target receiving station performs channel estimation according to the long training field, or indicates that the device of the non-target receiving station performs channel estimation according to the long training field, and sends a zero datagram separately. The message notification message notifies which devices perform channel estimation, and can reduce the overhead of channel sounding.

In a possible implementation, the first device may send the first message, where the first message includes the first identifier information, where the first message is used to indicate the location indicated by the first identifier information. The at least one second device performs channel estimation according to the long training field. This implementation, in combination with the implementation of the above indication information, may specifically specify which stations in the target receiving station perform channel estimation, or which of the non-target receiving stations perform channel estimation.

The first identifier information is used to indicate the at least one second device. For example, the first identifier information includes an Assosiation ID (AID) of the at least one second device, and may further include The other indication information of the connection identifier of the two devices, that is, the embodiment of the present application does not limit the indication manner of the first identification information.

The implementation is combined with the PPDU described above to perform channel sounding, and the channel detection overhead can still be reduced compared with the current channel sounding process.

In a possible implementation manner, the un-precoded long training field may be included in a physical layer preamble of the PPDU.

In a possible implementation manner, the PPDU may further include second identifier information, where the second identifier information is used to indicate a second device that feeds back channel information in the at least one second device while the PPDU is transmitted. The channel information is obtained by performing channel estimation according to the long training field by the second device indicated by the second identifier information. The second device indicated by the second identifier information is one or more of the at least one second device. In an embodiment, the second identifier information may be a media access control MAC address or an AID of the second device that needs to feed back channel information while the PPDU is transmitted, and may also be other indication information indicating the need The media access control MAC address or the AID of the second device that feeds back the channel information at the same time as the PPDU is transmitted. The embodiment of the present application does not limit the indication manner of the second identifier.

It can be seen that the implementation can reduce the overhead of notifying the second device to report the channel information in the channel detection as compared with the need to send the beamforming report polling message.

For the second device with full duplex communication capability, the channel information can be reported at the same time as receiving the PPDU, so that the time taken for each channel detection can be reduced.

For example, the second identifier information may be included in the media access control MAC header of the PPDU; if there are multiple second devices having full duplex communication capability, the second device that needs to feed back channel information may adopt an uplink multi-user. Uplink MultiUser Multiple Input Multiple Output (UL MU-MIMO) or Orthogonal Frequency Division Multiple Access (OFDMA) is used to feed back channel information. Correspondingly, the channel detecting method may further include: the first device receiving the channel information while the PPDU is transmitted.

The “simultaneously” refers to the channel information that can be received within the duration occupied by the wireless channel used by the first device to send the PPDU. Correspondingly, the “simultaneously” may also mean that the channel information may also be sent within the duration of receiving the PPDU by the second device, such that the first device and the second device need to have full duplex communication capability.

For example, the first device may receive channel information on the same frequency as the PPDU is transmitted. Correspondingly, the second device that needs to feed back the channel information may also send channel information on the same frequency while receiving the PPDU, that is, The wireless channel transmitted by the PPDU and the wireless channel transmitted by the channel information may be the same.

For example, the first device may also receive channel information at different frequencies while the PPDU is transmitted. Correspondingly, the second device that needs to feed back the channel information may also send channel information at different frequencies while receiving the PPDU. That is to say, the radio channel transmitted by the PPDU has the same time unit and different frequency as the radio channel for channel information transmission.

In another possible implementation manner, the PPDU further includes a feedback information type indication, where the feedback information type indicates that the channel information used for the feedback is a channel quality indicator or channel indication information. The channel indication information is parameter information of other feedback channel qualities in the channel information except the channel quality indicator.

Optionally, the channel information fed back by the second device indicated by the second identifier information in the PPDU may be pre-defined as a channel quality indicator.

In this way, when the channel information indicated by the feedback information type indicates that the channel information is the channel quality indicator, the first device may further include the following steps after receiving the channel information while the PPDU is being transmitted:

Determining, by the first device, the second device that needs to feed back the channel indication information according to the channel quality indicator, where the second device that needs to feed back the channel indication information is included in the second device indicated by the second identifier information;

The first device sends a second message, where the second message includes third identifier information, where the third identifier information is used to indicate the second device that needs to feed back channel indication information;

The second message is used to indicate the second device feedback channel indication information indicated by the third identifier information, where the channel indication information is performed by the second device indicated by the third identifier information according to the long training field. Channel estimation obtained.

In a possible implementation manner, the un-precoded long training field may be included in a field after the data field in the PPDU, that is, the non-precoded long training field is post-located.

Regardless of whether the pre-coded long training field is pre- or post-ended, the following possible implementations may be employed for how to inform the second device performing the channel estimation to feed back the channel information.

For example, in a possible implementation, the PPDU may further include a subframe, where the subframe includes second identifier information, where the subframe is used to indicate the second identifier information in the second device. And indicating, by the second device, feedback channel information, where the channel information is obtained by performing, by the second device indicated by the second identifier information, channel estimation according to the long training field.

In another possible implementation manner, after the first device sends the PPDU, the method further includes: the first device sends a third message, where the third message includes second identifier information, the third The message is used to indicate the second device feedback channel information indicated by the second identifier information in the second device, where the channel information is performed by the second device indicated by the second identifier information according to the long training field Channel estimation obtained.

Correspondingly, the foregoing subframe or the third message may also carry a feedback information type indication, which is used to indicate that the second device indicated by the second identifier information reports the channel quality indicator or the channel indication information.

In this way, when the channel information to be fed back is the channel quality indicator, the first device may perform: the first device determines, according to the channel quality indicator, that a feedback channel indication is needed. a second device of the information, the second device that needs to feed back the channel indication information is included in the second device indicated by the second identifier information; the first device sends a second message, where the second message includes The third identifier information is used to indicate the second device that needs to feed back the channel indication information; the second message is used to indicate the second device feedback channel indication information indicated by the third identifier information, The channel indication information is obtained by performing, by the second device indicated by the third identifier information, channel estimation according to the long training field.

Optionally, when the channel information is fed back, the second device included in the target receiving station may aggregate the channel indication information, the channel information, and the acknowledgement message ACK to be fed back. The ACK is used for confirmation by the second device included in the target receiving station for receiving the data field in the PPDU.

Optionally, the second message or the third message sent by the first device may be in full duplex communication with the ACK of the receiving target receiving site feedback. That is, the first device may send the second message or the third message within a time period for receiving the ACK of the target receiving station feedback.

Optionally, the second device feedback channel information of the non-target receiving station and the first device sending the PPDU are in a full-duplex manner, that is, the second device of the non-target receiving station may use the feedback of the second device for sending the PPDU. Channel information.

Optionally, the number of time units occupied by the long pre-coded long training field is the number of data streams supported by the first device.

In a possible implementation manner, the at least one un-precoded long training sequence is included in a field after the data field in the PPDU.

In a possible implementation manner, the PPDU further includes a channel type indication, where the feedback information type indication is used to indicate that the channel information is a channel quality indicator or channel indication information.

In a possible implementation manner, after the channel information is the channel quality indication, after the first device receives the channel information, the method further includes:

Determining, by the first device, the second device that needs to feed back the channel indication information according to the channel quality indicator, where the second device that needs to feed back the channel indication information is included in the second device indicated by the second identifier information; The first device sends a second message, where the second message includes third identifier information, where the third identifier information is used to indicate the second device that needs to feed back channel indication information;

The second message is used to indicate the second device feedback channel indication information indicated by the third identifier information, where the channel indication information is performed by the second device indicated by the third identifier information according to the long training sequence. Channel estimation obtained.

In a possible implementation, the PPDU further includes a subframe, where the subframe includes second identifier information, where the subframe is used to indicate that the second identifier information in the at least one second device is indicated The second device feeds back channel information, where the channel information is obtained by performing channel estimation according to the long training sequence by the second device indicated by the second identifier information.

In a possible implementation, after the first device sends the PPDU, the method further includes:

The first device sends a third message, where the third message includes second identifier information, where the third message is used to indicate the second device feedback indicated by the second identifier information in the at least one second device And channel information obtained by the second device indicated by the second identifier information according to the long training sequence.

In a possible implementation, the method further includes: the first device receiving the channel information.

In a second aspect, the embodiment of the present application further provides a channel detection method, which is described from the perspective of a second device performing channel estimation. The channel detecting method may include: the second device receives a physical layer protocol data unit PPDU, where the PPDU includes a precoded data field and a long training field that is not precoded; and the second device is configured according to the long training. The field performs channel estimation.

In a possible implementation manner, the PPDU further includes indication information, where the indication information is used to indicate whether the long training field is used for a target receiving station of a data field in the PPDU for channel estimation; or The indication information is used to indicate whether the target receiving station of the data field in the PPDU performs channel estimation according to the long training field.

In a possible implementation manner, when the indication information indicates that the long training field is used by a target receiving station of a data field in the PPDU for channel estimation, and the second device is included in the Channel estimation according to the long training field when the target receiving station is in use; and when the indication information indicates that the long training field is not used by a target receiving station of a data field in the PPDU for channel estimation and the second When the device is not included in the target receiving station, channel estimation is performed according to the long training field.

In a possible implementation manner, the method further includes:

Receiving, by the second device, the first message, where the first message includes first identifier information, where the first identifier information is used to indicate a device that performs channel estimation according to the long training field;

When the second device is included in the device indicated by the first identification information, the second device performs the step of performing channel estimation according to the long training field.

In a possible implementation manner, the unprecoded long training field is included in a physical layer preamble of the PPDU.

In a possible implementation manner, the non-precoded long training field is included in a field after the data field in the PPDU.

In a possible implementation manner, the PPDU further includes second identifier information, where

The second identifier information is used to indicate a device that feeds back channel information while the PPDU is transmitted, and the channel information is obtained by performing, by the device indicated by the second identifier information, channel estimation according to the long training field.

In a possible implementation, when the second device is included in the device indicated by the second identifier information, the method further includes:

The second device sends channel information while receiving the PPDU, and the channel information is obtained by the second device performing channel estimation according to the long training field.

In a possible implementation manner, the PPDU further includes a feedback information type indication, where the feedback information type indication is used to indicate that the channel information is a channel quality indicator or channel indication information.

In a possible implementation manner, after the channel information is a channel quality indicator, after the second device sends the channel information, the method further includes:

The second device receives a second message, where the second message includes third identifier information, where the third identifier information is used to indicate a device that needs to feed back channel indication information in the device indicated by the second identifier information;

When the second device is included in the device indicated by the third identifier information, the second device sends channel indication information, where the channel indication information is that the second device performs a channel according to the long training field. Estimated to be obtained.

In a possible implementation, the PPDU further includes a subframe, where the subframe includes second identifier information, where the subframe is used to indicate that the device indicated by the second identifier information feeds back channel information, The channel information is obtained by the device indicated by the second identification information according to the long training field for channel estimation.

In a possible implementation, after the second device performs channel estimation according to the long training field, the method further includes:

The second device receives a third message, where the third message includes second identifier information, where the third message is used to indicate that the device indicated by the second identifier information feeds back channel information, where the channel information is The device indicated by the second identification information is obtained by performing channel estimation according to the long training field.

The second device sends the channel information, where the channel information is obtained by the second device performing channel estimation according to the long training field.

For the channel detection method described in this aspect, reference may be made to the related content of the foregoing first aspect, which is not repeated here.

In a third aspect, the embodiment of the present application further provides a channel detecting apparatus, which may include a processing module, a communication module, and the like, and may further include other modules to implement related functions of the first device in the foregoing aspect.

In a fourth aspect, the embodiment of the present application further provides another channel detecting apparatus, which may include a communication module, a processing module, and the like, and may further include other modules to implement related functions of the second device in the foregoing aspect.

In a fifth aspect, the embodiment of the present application further provides a communication device, where the communication device has the functions of implementing the first device and/or the second device in the foregoing implementation method. This function can be implemented in hardware, for example, including a processor and a communication interface, or can be implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above, which may be software and/or hardware.

In a sixth aspect, the embodiment of the present application further provides a computer readable storage medium, where the readable storage medium stores a channel detecting method provided by any one of the foregoing aspects, or Program code for a channel sounding method provided by any one or more of the possible implementations of any of the aspects, the program code comprising the channel sounding method provided by any of the above aspects, or the above aspects An execution instruction of any one or more of the possible channel detection methods provided in any of the possible implementations.

In a seventh aspect, the embodiment of the present application further provides a computer program product comprising instructions, when the computer program product is run on a computer, causing the computer to perform the method described in the above aspects. The programs in the computer program product may be stored in whole or in part on a storage medium packaged with the processing, or may be stored partially or entirely on a memory not packaged with the processor.

In an eighth aspect, the application further provides a processor, the processor may comprise at least one circuit for generating a physical layer protocol data unit PPDU, the PPDU comprising a precoded data field and at least one unprecoded long a training sequence; the processor further comprising at least one circuit for transmitting the PPDU, such that at least one second device performs channel estimation based on the long training sequence. The above processor may be a chip. The processor can execute instructions or programs for implementing the functions involved in the aforementioned first device.

In a ninth aspect, the embodiment of the present application further provides another processor, where the processor may include at least one circuit, configured to receive a physical layer protocol data unit PPDU, where the PPDU includes a precoded data field and at least one unpassed A pre-coded long training sequence; the processor further comprising at least one circuit for performing channel estimation based on the long training sequence. The processor can be a chip. The processor can execute instructions or programs for implementing the functions involved in the aforementioned second device.

In a tenth aspect, the embodiment of the present application further provides a chip system, where the chip system includes a processor, where the first device and/or the second device implement the functions involved in the foregoing aspects, for example, generating or processing the foregoing. Data and/or information involved in the method. In one possible design, the chip system further includes a memory for holding program instructions and data necessary to implement the first device and/or the second device function. The chip system can be composed of chips, and can also include chips and other discrete devices.

DRAWINGS

1 is a schematic flow chart of a channel detecting method in the time domain in the prior art;

2 is a schematic structural diagram of a communication system according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a physical layer protocol data unit according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of another physical layer protocol data unit according to an embodiment of the present disclosure;

FIG. 5 is a schematic flowchart of a channel detecting method according to an embodiment of the present disclosure;

FIG. 5b is a schematic flowchart of a channel detection method in a time domain according to an embodiment of the present disclosure;

FIG. 6 is a schematic flowchart of another channel detecting method according to an embodiment of the present application in a time domain;

FIG. 7 is a schematic flowchart of still another channel detecting method in the time domain according to an embodiment of the present application;

FIG. 8 is a schematic flowchart of still another channel detecting method in the time domain according to an embodiment of the present application;

FIG. 9 is a schematic flowchart of still another channel detecting method in the time domain according to an embodiment of the present application;

10 is a schematic flowchart of still another channel detecting method in the time domain according to an embodiment of the present application;

11 is a schematic flowchart of still another channel detecting method in the time domain according to an embodiment of the present application;

FIG. 12 is a schematic structural diagram of a channel detecting apparatus according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of another channel detecting apparatus according to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of a device according to an embodiment of the present disclosure;

FIG. 15 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure;

FIG. 16 is a schematic structural diagram of a network device according to an embodiment of the present disclosure.

Detailed ways

The terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

In order to reduce the mutual interference between multiple users in Multiple Input Multiple Output (MIMO) and improve the system capacity in the MIMO system, usually, the AP obtains the sounding process through the channel before the data transmission. Channel information. Figure 1 shows a channel sounding process. The access point first sends a zero data message notification message NDP Annoucement to inform STA1 to STA3 that it needs to obtain channel information to receive the zero data packet NDP frame it will send. The AP sends an NDP frame and specifies STA1 that needs to immediately feed back channel information. STA1 to STA3 estimate respective downlink channels according to Long Training Field (LTF) in the NDP frame; STA1 that is immediately fed back channel information by the AP is receiving. After the NDP frame is completed, the estimated channel information is fed back. STA2 and STA3, which are not specified by the NDP frame, continue to wait for the feedback notification of the AP; the AP will specify a STA each time through the Beamforming Report-Poll Trigger (BRPTrigger). Feedback channel information. As shown in Figure 1, the AP sends NDP, Beamforming Report-Poll, and individual STA feedback channel information to each STA as the main overhead of the entire Sounding process. The greater the cost of Sounding, the smaller the actual gain of MIMO. In addition, since the STA performs channel estimation according to the NDP sent by the pre-Sounding AP, if the duration of the Sounding is longer, the effectiveness of the channel estimation will be deteriorated, which also affects the effect of precoding and affects the performance of the MIMO.

As the number of AP-side antennas increases (for example, from the current 4 antennas to 8 to 16 antennas), the AP will support more and more STAs for DLMU-MIMO transmission, so channel detection needs to be performed more frequently. Process. As shown in Figure 1, each Sounding process requires a certain amount of channel resources, which will make it difficult to meet the increasingly frequent Sounding needs.

Therefore, the solution of the present application proposes a solution, which can improve the efficiency of channel sounding and reduce the cost of channel sounding. Further, the embodiment of the present application further proposes a solution, which can be based on full duplex (Full Duplex) FD) In the wireless communication technology, the AP and the STA can perform uplink and downlink transmission at the same time or at the same frequency, further improve the efficiency of channel detection, and reduce the overhead of channel detection, which is described in detail below.

FIG. 2 shows an exemplary application scenario of an embodiment of the present application. In the communication system 100, a first device, such as an AP 101, and one or more second devices associated with the first device 101, such as STA 201, STA 202, STA 203, and STA 204, are included. The AP 101 is transmitting the PPDU with the STA 201 and the STA 202, that is, the STA 201 and the STA 202 are the target receiving stations of the transmitted PPDU. It can also be said that the STA 201 and the STA 202 are devices that are designated to receive the data field in the transmitted PPDU; STA 203, The STA 204 is a non-target receiving station of the transmitted PPDU, that is, a device that is not designated to receive the data field in the transmitted PPDU. It is to be understood that the number of the first device and the second device in the foregoing communication system 100 is merely exemplary and does not constitute a limitation on the embodiments of the present application.

In this embodiment, the first device may be a base station, a Transmission Reception Point (TRP), or a Radio Remote Unit (RRU), and other types of access points (APs). For example, a base station may refer to a device in an access network that communicates with a terminal over an air interface over one or more sectors, which may coordinate attribute management of the air interface. For example, the base station may be a base station in GSM or CDMA, such as a base transceiver station (BTS), or a base station in WCDMA, such as a NodeB, or an evolved base station in LTE, such as an eNB or an e. -NodeB (evolutional Node B), which may also be a base station in a 5G system, or a base station in a future network, etc., which is not limited in this application. Optionally, the base station may also be a relay device or another network element device with a base station function. Additionally, in some embodiments of the present application, the first device also needs to have full duplex communication capabilities.

In the embodiment of the present application, the second device may be a wireless terminal, where the wireless terminal may be a device that provides voice and/or data connectivity to the user, a handheld device with a wireless connection function, or other processing device connected to the wireless modem. It can communicate with one or more core networks via a radio access network (eg, RAN, radio access network). For example, the user equipment can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, and can also be a portable, pocket, handheld, computer built-in or vehicle-mounted mobile device, such as Personal Communication Service (PCS) telephone, cordless telephone, Session Initiation Protocol (SIP) telephone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA) Etc., they exchange language and/or data with the wireless access network. Optionally, the user equipment may also be referred to as a mobile station (MS), a mobile terminal, a subscriber unit (Sub), a subscriber station (Subscriber Station, SS), and a mobile station (Mobile Station). , MB), remote station (Remote Station, RS), access point (AP), remote terminal (RT), access terminal (AT), user terminal (User Terminal; UT) The user agent (User Agent, UA), the terminal device (User Device, UD), etc., are not limited in this application. In addition, in the embodiment of the present application, the second device may have full duplex communication capability or half duplex communication capability.

It should be noted that, based on the working principle of the transceiver, the "simultaneous" involved in this embodiment is substantial, and there is no need to strictly limit the processing on the different channels without any time difference, and only needs to satisfy the whole. The above processing may be substantially the same in time dimension. Moreover, it is beneficial that multiple sites simultaneously communicate with the AP in the solution of the embodiment of the present application. For example, this may allow the AP to receive channel information fed back by multiple stations while transmitting the PPDU, thereby improving system efficiency. For example, the channel information may also be received within the length of time occupied by the wireless channel used by the first device to transmit the PPDU. For another example, the second device may also send channel information within the duration of receiving the PPDU, such first device and second device need to have full duplex communication capability.

It should be understood that the term "and/or" herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B alone. In addition, the character "/" in this article indicates that the contextual object is an "or" relationship.

Herein, the first identification information is used to indicate at least one second device that performs channel estimation according to the Non-precoded LTF field in the present application; the second identification information is used to indicate a device that needs to feed back channel information; that is, the second identifier The second device indicated by the information is included in the at least one second device indicated by the first identification information. In addition, the third identifier information is used to indicate that the device that has received the channel quality indicator needs to further feed back the channel indication information, that is, the second device indicated by the third identifier information is included in the second indication information. In the second device.

The first identifier information may include an Assosiation ID (AID), or may include other indication information for indicating a connection identifier of the second device. The second identifier information may include an AID or media access control of the second device. An address, or may include other indication information indicating an AID or a medium access control address of the second device; the third identification information may include an AID of the second device, or may include other information indicating a connection identifier of the second device Instructions. That is to say, the embodiment of the present application does not limit the indication manners of the first identification information, the second identification information, and the third identification information.

The solution of the embodiment of the present application will be described below with reference to more drawings.

An embodiment of the present application provides a physical layer protocol data unit, where the physical layer protocol data unit is applicable to a MIMO technology. The physical layer protocol data unit may include unprecoded data fields in addition to the precoded data fields. Long training field. Based on the location of the un-pre-coded long training field in the PPDU, the embodiment of the present application provides a physical layer protocol data unit of the LTF preamble and a physical layer protocol data unit of the LTF.

In the embodiment of the present application, the “preamble” in the physical layer protocol data unit of the LTF preamble is relative to the “post” in the physical layer protocol data unit of the LTF. That is, the LTF field in the physical layer protocol data unit of the LTF preamble is located in front of the physical layer protocol data unit, for example, the LTF field is located in the physical layer preamble sequence of the physical layer protocol data unit; the physical layer behind the LTF The LTF field in the protocol data unit is located after the physical layer protocol data unit, for example, the LTF field is located in a field following the data field in the physical layer protocol data unit. The LTF field is configured to include a long training sequence that is not precoded, so that the second device performs channel estimation according to the long training sequence that is not precoded in the LTF field. That is, the unprecoded LTF field is used to include a long training sequence that is not precoded, and therefore, the unprecoded LTF field is used by at least one second device for channel estimation.

The physical layer protocol data unit includes long training without precoding, in addition to Legacy Preamble (L-Preamble), new Preamble, and data fields (Non- Precoded LTF) field. The PPDU includes N _STS LTF symbols, and the physical layer protocol data unit may include N _STS LTF fields that are not precoded, where the N _STS may be the number of spatial data streams supported by the AP.

Please refer to FIG. 3. FIG. 3 is a schematic diagram of a format of a physical layer protocol data unit of an LTF preamble according to an embodiment of the present application. As shown in Figure 3, the L-Preamble is compatible with the legacy information of the traditional device. The main function is to let the device perform preliminary synchronization, gain adjustment, channel estimation, and let the traditional device know the frame length. This part is related to the current defined tradition. The preamble type; New-SIG is a signaling field in the New Preamble, which may include coding and modulation modes, uplink and downlink indications, identification of basic service set BSS, bandwidth, and the like.

As shown in FIG. 3, the LTF field that has not undergone precoding processing is included in the New Preamble, and can support channel estimation in the channel sounding process according to the unpreprocessed LTF field by the new device with respect to the legacy device. The remaining part of the New Preamble (ie, the Rest of the New-Preamble) may contain the remaining preamble information, such as a short preamble field, a long preamble field, etc., mainly to help or support the new second device for precise synchronization, gain adjustment, etc. . The conventional device or the new device described herein is relatively speaking. For example, the legacy device may be a second device that cannot support channel estimation according to the unprecoded LTF field, and the new device is capable of supporting A second device for performing channel estimation by precoding the LTF field. In the application scenario shown in FIG. 2, the second devices STAs 201-204 are new devices, each having the capability of performing channel estimation according to the LTF field that is not precoded.

Please refer to FIG. 4. FIG. 4 is a schematic structural diagram of another physical layer protocol data unit according to an embodiment of the present application. The PPDU shown in FIG. 4 is different from the PPDU shown in FIG. 3 in that, in the PPDU shown in FIG. 4, the Non-precoded LTF field is located at the end of the PPDU, that is, in a field after the data field in the PPDU.

For example, based on the PPDU shown in FIG. 3 or FIG. 4, please refer to FIG. 5a, which is a schematic flowchart of a channel detecting method according to an embodiment of the present disclosure. The channel detecting method may include the following steps:

101. The first device generates a PPDU, where the PPDU includes a precoded data field and a long training field that is not precoded.

102. The first device sends the PPDU.

103. The at least one second device receives the PPDU, and performs channel estimation according to a long training field that is not precoded in the PPDU.

For example, the first device may be the access point AP 101 in FIG. 2, and the second device may be the station STA201-STA204 in FIG. 2.

In the channel detection method, the channel sounding process is combined with the first device to send the physical layer protocol data unit to perform channel sounding. Compared with the foregoing FIG. 1, the NDP is prevented from being separately transmitted, thereby reducing the overhead of the NDP frame in the channel sounding.

FIG. 5b shows an exemplary scenario for transmitting a PPDU in the embodiment of the present application. As shown in FIG. 5b, in the time domain, the first device sends two PPDUs, and one does not include a Non-precoded LTF field. The PPDU is a normal PPDU; the other is a PPDU containing a Non-precoded LTF field, that is, a PPDU capable of causing at least one second device to perform channel estimation. It can be seen that the NDP in FIG. 1 does not need to be separately sent in FIG. 5b, so that the overhead of NDP in channel sounding can be reduced to some extent.

For example, based on the application scenario shown in FIG. 2, the AP 101 may generate a PPDU including a precoded data field and a long pre-coded training field, and the AP 101 transmits the PPDU; the STAs 201 to 204 may receive the PPDU, and according to the PPDU, according to The long training field that is not precoded in the PPDU performs channel estimation, thereby avoiding the overhead caused by the AP 101 separately transmitting the NDP frame for channel sounding.

In a possible implementation manner, the embodiment of the present application further provides a PPDU format, that is, the PPDU shown in FIG. 3 or FIG. 4 may further include indication information, where the indication information is used to indicate the Non-precoded LTF. Whether the field is used for the target receiving station of the data field in the PPDU for channel estimation; or the indication information is used to indicate whether the target receiving station of the data field in the PPDU performs channel estimation according to the Non-precoded LTF field.

Thus, when the Non-precoded LTF field is used for channel estimation by a target receiving station of a data field in the PPDU, the at least one second device is included in the target receiving station; when the Non-precoded LTF When the field is not used for channel estimation by the target receiving station of the data field in the PPDU, the at least one second device is not included in the target receiving station.

The target receiving station is a station that is designated to receive the data field of the PPDU, that is, a second device that is performing multiple input multiple output transmission with the first device; and the non-target receiving station is data that is not designated to receive the PPDU. The site of the field, that is, the second device that does not have multiple input and multiple output transmissions with the first device. The site designated to receive the data field of the PPDU is indicated by the identifier information in the physical layer header in the PPDU.

In addition, the indication information may also be used to indicate whether a Non-precoded LTF field is included in the PPDU.

For example, if the indication information is a 1-bit indication bit, the 1-bit indication bit is 1, it may indicate that the target receiving station performs channel estimation according to the Non-precoded LTF field, and the second device in the foregoing FIG. 5a Included in the target receiving station; when the 1-bit indicator bit is 0, it may indicate that the non-target receiving station performs channel estimation according to the Non-precoded LTF field, and the second device in the foregoing FIG. 5a is included in the non-target receiving station. .

For example, if the indication information is a 2-bit indication bit, the 2-bit indication bit is 01, indicating that the target receiving station performs channel estimation according to the Non-precoded LTF field; the 2-bit indication bit is At 10 o'clock, it indicates that the non-target receiving station performs channel estimation according to the Non-precoded LTF field; when the 2-bit indication bit is 00, it indicates that the PPDU does not include a Non-precoded LTF field, which is a normal PPDU.

Therefore, performing channel estimation according to the Non-precoded LTF field in the PPDU in the foregoing FIG. 5a may include: after receiving the PPDU for each second device, when the second device is included in the target When the receiving station indicates that the long training field is used by the target receiving station for channel estimation, the second device performs channel estimation according to the Non-precoded LTF field; when the second device is not included in the target receiving And when the indication information indicates that the Non-precoded LTF field is not used by the target receiving station for channel estimation (ie, the indication information indicates that the Non-precoded LTF field is used for non-target receiving station for channel estimation), Channel estimation is performed according to the Non-precoded LTF field.

In this way, in the implementation manner, the second device can be used to indicate the channel estimation by using the indication information, and it is not necessary to separately send the NDP Announcement to notify the second device to perform channel estimation as shown in FIG. 1 , so that the NDP Announcement and the NDP can be saved. Overhead, reducing the overhead of channel sounding.

For example, based on the application scenario shown in FIG. 2, the AP 101 generates a PPDU, which includes an LTF field and indication information that is not precoded, and the indication information is 01 to indicate that the long training field is used for channel estimation of the target receiving station, AP101. Transmitting the PPDU; the STAs 201 to 204 receive the PPDU, and since the indication information indicates that the long training field is used for the channel estimation of the target receiving station and the STA 201 and the STA 202 are the target receiving stations, the STA 201 and the STA 202 perform channel estimation according to the long training field; And STA 204 does not have to perform channel estimation.

In a possible implementation manner, in the channel detecting method shown in FIG. 5a, before the first device sends the PPDU, the first device may further send a first message, where the first message includes first identifier information; the first message. The at least one second device indicated by the first identifier information is configured to perform channel estimation according to the long training field; the at least one second device receives the first message, and the at least one second device is included in the first identifier Channel estimation is performed according to the long pre-coded long training field in the device indicated by the information.

For example, the first message may be the NDP Announcement in FIG. 1, so that, in combination with the PPDU shown in FIG. 3 or FIG. 4 above, the overhead of channel sounding can be reduced.

In an example, the second device in the second device included in the target receiving station may be notified by the NDP Announcement to perform channel estimation, that is, the at least one second device performing channel estimation is a part of the target receiving station, In another example, the second device in the at least one second device included in the non-target receiving station may be notified by the NDP Announcement to perform channel estimation, that is, the at least one second device performing channel estimation is a non-target receiving station. Some of the devices in the network do not have channel estimation for all non-target receiving sites. This is more advantageous for the first device to determine which second devices perform channel estimation based on whether there is data that needs to be sent to the second device.

For example, based on the application scenario shown in FIG. 2, the AP 101 may first send a first message, where the device indicated by the first identifier information includes the STA 203 and the STA 204, and the STAs 201 to 204 receive the first message and view the information. The device indicated by the first identifier information carried in the first message is the self, and the STA 203 and the STA 204 are included in the device indicated by the first identifier information, so the STA 203 and the STA 204 receive the embodiment of the present application after the preset time interval. The PPDU is described, and the channel estimation is performed according to the unprecoded LTF field carried in the PPDU, and the STA 201 to the STA 202 are the target receiving stations. After receiving the PPDU, the indication information carried by the PPDU is 10, indicating that the PPDU is not The precoded LTF field performs channel estimation for the device of the non-target receiving station, so the STA 201 to STA 202 receive the data field in the PPDU without channel estimation.

In a possible implementation manner, the embodiment of the present application further provides a PPDU, that is, the PPDU is provided for the Non-precoded LTF field in addition to the Non-precoded LTF field and the indication information mentioned in the foregoing implementation manner. a PPDU, the PPDU may further include second identifier information, where the second identifier information is used to indicate a second device that feeds back channel information while the PPDU is transmitted, where the second device is included in the second device that performs channel estimation. And the channel information is obtained by performing, by the second device indicated by the second identifier information, channel estimation according to the long training field.

In this way, while the PPDU is transmitted, the second device that needs to feed back the channel information can also report the channel information, thereby further reducing the channel detection overhead.

Based on the implementation, the channel detecting method shown in FIG. 5a may further include: for each second device of the at least one second device, when the second device is included in the device indicated by the second identification information, The two devices send channel information while receiving the PPDU, wherein the channel information is obtained by the second device performing channel estimation according to the Non-precoded LTF field.

Referring to FIG. 6, FIG. 6 is a schematic flowchart of another channel detecting method according to an embodiment of the present application in a time domain. 6 is an example of the application scenario shown in FIG. 2, and the PPDU used in the channel detection method shown in FIG. 6 includes a Non-precoded LTF field (preamble), indication information, and second identification information. PPDU, assuming that the indication information is used to indicate that the Non-precoded LTF field is used by the target receiving station for channel estimation. As shown in FIG. 6, the AP 101 first sends a normal PPDU, that is, the PPDU does not include the LTF field that is not precoded; the STAs 201 to 204 receive the PPDU; and the STA 201 and the STA 202 view that the header of the specified received data field in the PPDU is included. The STA information and the PPDU do not include the indication information, so the STA 201 and the STA 202 acquire the data field in the PPDU, and return an ACK message to the AP 101 to notify the AP 101; and the STA 203 and the STA 204 view the header of the specified received data field in the PPDU. Including its own identification information and the PPDU does not contain the indication information, so the STA 203 and the STA 204 ignore the PPDU; the AP 101 transmits a PPDU including a Non-precoded LTF field, indication information, and second identification information; STAs 201 to 204 receive the PPDU; STA 201 and The STA 202 checks that the header of the specified received data field in the PPDU includes its own identification information and includes indication information, and the indication information indicates that the Non-precoded LTF field is used by the target receiving station for channel estimation, so the STA 201 and the STA 202 receive the Simultaneously, the channel estimation is performed according to the Non-precoded LTF field, the channel information is obtained, and the channel is obtained. The information is returned to the AP 101; and the STA 203 and the STA 204 see that the header of the specified received data field in the PPDU does not include its own identification information and the PPDU contains indication information, but the indication information indicates that the Non-precoded LTF field is used for target reception. The station performs channel estimation, so STA 203 and STA 204 ignore the PPDU.

In one example, STA 201 and STA 202 may feed back an ACK within a preset time interval after receiving the PPDU containing the unprecoded LTF field; in another example, STA 201 and STA 202 may send the next PPDU at AP 101. At the same time feedback ACK.

In addition, the channel detecting process shown in FIG. 6 requires the STA 201 and the STA 202 to have full duplex communication capability.

Referring to FIG. 7, FIG. 7 is a schematic flow chart of another channel detecting method in the time domain according to an embodiment of the present application. FIG. 7 is an example of the application scenario shown in FIG. 2, wherein the channel detecting method shown in FIG. 7 is different from the channel detecting method shown in FIG. 6 in that the indication information in FIG. 7 indicates the The Non-precoded LTF field is used for channel estimation by the non-target receiving station. Therefore, in the channel sounding process shown in FIG. 7, the STA 201 and the STA 202 view the indication information to indicate that the Non-precoded LTF field is used for the non-target receiving station to perform channel. When estimating, the channel estimation is no longer performed; and when the STA 203 and the STA 204 view the indication information indicating that the Non-precoded LTF field is used for channel estimation by the non-target receiving station, the channel estimation is performed according to the Non-precoded LTF field.

Optionally, before sending the PPDU including the unprecoded LTF field, a zero data message notification message NDP Announcement may be sent, where the NDP Announcement frame includes the identifier of the station that needs to perform channel estimation, as shown in FIG. The NDP Announcement frame may include the STA STA 203 identification information and the STA STA 204 identification information, and the identifier information may be a site association identifier. It can be understood that, in an example, the NDP Announcement frame may further include identifier information of a part of the non-target receiving station, and is used to indicate that the part of the non-target receiving station performs channel estimation. For example, the NDP Announcement frame may include the STA203. The identification information is used to instruct the STA 203 to perform channel estimation based on the PPDU containing the LTF that has not been precoded.

In a possible implementation, the PPDU provided by the embodiment of the present application further includes a feedback information type indication, where the feedback information type indication is used to indicate that the channel information that is fed back is a channel quality indicator or channel indication information.

In the embodiment of the present application, the channel information may include channel state information (CSI), a non-compressed beamforming matrix, a compressed beamforming matrix, and each OFDM. At least one of Signal to Noise Ratio (SNR) on the subcarrier; the channel indication information may also be at least one of the above channel information.

Referring to FIG. 8 , FIG. 8 is a schematic flowchart of another channel detection method in the time domain according to an embodiment of the present disclosure, and FIG. 8 is an example of the application scenario shown in FIG. 2 , where FIG. 8 illustrates The channel detection method shown in FIG. 6 is different from the channel detection method shown in FIG. 6 in that the channel information fed back by the STA 201 and the STA 202 is a Channel Quality Indicator (CQI), that is, the STA 201 and the STA 202 are receiving the PPDU. At the same time, the feedback channel quality indication or the feedback channel indication information may be determined according to the type of the feedback information carried by the PPDU.

In the channel detecting method shown in FIG. 5a, when the channel information that is fed back is the channel quality indicator, after the first device receives the channel information while the PPDU is being transmitted, the first device determines according to the channel quality indicator. a second device that needs to feed back the channel indication information, where the second device that needs to feed back the channel indication information is included in the second device indicated by the second identifier information; the first device sends a second message, where the The second message includes the third identifier information, where the third identifier information is used to indicate the second device that needs to feed back the channel indication information; the at least one second device receives the second message, and the second message includes the third identifier information, The second device included in the device indicated by the third identifier information may send channel indication information; the first device receives the channel indication information that is fed back.

Therefore, as shown in FIG. 8 , in an example, the second message may be a BRP Trigger, where the BRP Trigger includes third identifier information, where the third identifier information indicates that both the STA 201 and the STA 202 that feed back the CQI need to feed back channel indication information. Therefore, the STA 201 and the STA 202 receive the channel indication information after receiving the BRP Trigger.

As an example, when the STA 201 and the STA 202 feed back the channel indication information, the channel indication information can be fed back within the duration of the AP 101 sending the PPDU, and the overhead of the channel detection can be further reduced. In another example, the STA 201 and the STA 202 may also feed back the channel indication information according to the uplink scheduling resource indication information in the BRP Trigger.

In a possible implementation manner, for the PPDU that is provided by the non-precoded LTF field provided by the embodiment of the present application, the PPDU further includes a subframe, that is, the subframe may be sent in an aggregated manner simultaneously with the PPDU, that is, The PPDUs that are associated with the Non-precoded LTF field and the sub-frames can be combined into one aggregated PPDU, and the aggregated PPDUs share a preamble. The subframe includes the second identifier information, where the subframe is used to indicate the second device feedback channel information indicated by the second identifier information in the at least one second device, where the channel information is the The second device indicated by the second identifier information is obtained by performing channel estimation according to the long training field.

In an example, the second device indicated by the second identifier information may aggregate the feedback ACK and the channel information, and in another example, the second device indicated by the second identifier information may receive the Non-precoded LTF field. The aggregated ACK and channel information are fed back to the next PPDU of the post PPDU.

Please refer to FIG. 9. FIG. 9 is a schematic flowchart of another channel detection method in the time domain according to an embodiment of the present disclosure. FIG. 9 is an example of the application scenario shown in FIG. The difference between FIG. 9 and FIG. 6 is that the PPDU used for channel sounding is a PPDU followed by a Non-precoded LTF field, and does not include the second identification information, but is aggregated with a subframe, and the subframe is a BRP Trigger frame. And the BRP Trigger frame indicates that all the target receiving stations need to report channel information, and the difference between FIG. 9 and FIG. 6 is that the timings of the STA 201 and the STA 202 feeding back the channel information are different. In FIG. 9 , in one example, the STA 201 and the STA 202 may After the preset time interval, the channel information is fed back. At this time, the STA 201 and the STA 202 do not need to have full duplex communication capability. In another example, the STA 201 and the STA 202 can feed back the aggregated ACK and channel information while transmitting the next PPDU. At this time, STA201 and STA202 are required to have full duplex communication capability.

In a possible implementation, after the PPDU is sent by the non-precoded LTF field provided by the embodiment of the present application, the first device may send a third message, where the third message includes the second identifier information. The third message is used to indicate the second device feedback channel information indicated by the second identifier information in the second device, where the channel information is the second device according to the second identifier information The long training field is obtained by channel estimation.

Therefore, in the channel detecting method shown in FIG. 5a, after the first device sends the PPDU, the first device sends a third message, where the third message includes second identifier information, where the third message is used to indicate the at least And the second device feedback channel information indicated by the second identifier information in the second device, where the channel information is obtained by the second device indicated by the second identifier information according to the long training field; The at least one second device receives the third message, and the second device that is included in the device indicated by the second identifier information feeds back channel information; the first device receives the channel information that is fed back.

For example, please refer to FIG. 10. FIG. 10 is a schematic flowchart of another channel detection method in the time domain according to an embodiment of the present application. FIG. 10 is an example of the application scenario shown in FIG. The channel sounding method shown in FIG. 10 is different from that of FIG. 7 in that the Non-precoded LTF field in the PPDU for performing channel sounding in FIG. 10 is followed by the second identifier information. Before the AP 101 sends the PPDU for channel sounding, the NDP Announcement may be sent to notify the STA 203 and the STA 204 to perform channel estimation according to the PPDU to be sent. After the AP 101 sends the PPDU, the third message that can be sent is the BRP Trigger. The STA 203 and the STA 204 are instructed to feed back channel information. In this way, the STA 203 and the STA 204 can perform channel estimation after receiving the PPDU, but feed back the channel information after receiving the BRP Trigger. In one example, STA 203 and STA 204 may feed back channel information after a preset time interval after receiving the BRP Trigger; in another example, STA 203 and STA 204 may provide feedback after receiving BRP Trigger and when AP 101 transmits the next PPDU. Channel information; In yet another example, STA 201 and STA 202 may feed back an ACK when AP 101 transmits a first message or a third message.

The foregoing various possible implementation manners provided by the embodiments of the present application may be performed by using at least one or more types of channel detection, which is not limited in this embodiment. In some examples, the embodiments of the present application may also perform the channel detection by combining the foregoing various possible implementation manners with the existing channel detection process, which is not limited in this embodiment. For example, please refer to FIG. 11. FIG. 11 is a schematic flowchart of another channel detection method according to Embodiment 1 of the present application, and FIG. 11 is an example of the application scenario shown in FIG. The channel detecting method shown in FIG. 11 can employ the channel detecting method shown in FIGS. 6 and 7. Specifically, it is assumed that the PPDU used by the STA 201 and the STA 202 in FIG. 6 is the first PPDU, and the PPDU used by the STA 203 and the STA 204 in FIG. 7 is the second PPDU, where the first PPDU and the second PPDU are used. The difference is that the indication information and the content of the second identification information are different, and the indication information included in the first PPDU indicates that the Non-precoded LTF field is used for the target receiving station, that is, the STA 201 and the STA 202 perform channel estimation, and the included second identification information. Used to instruct STA 201 and STA 202 to feed back channel information while transmitting the first PPDU; the indication information included in the second PPDU indicates that the Non-precoded LTF field is used for non-target receiving stations, that is, STA 203 and STA 204 perform channel estimation, and the included The second identifier information is used to indicate that the STA 203 and the STA 204 feed back the channel information while the second PPDU is being transmitted. The first device may also send an NDP Announcement, notify the STA 203 and the STA 204 to perform channel estimation, and the first device. The NDP Announcement may be sent within the duration of the STA 201 and the STA 202 feeding back the ACK, further reducing the channel sounding station. Time unit, and reduce the overhead of channel sounding. Optionally, as shown in FIG. 11, the STA 201 and the STA 202 may feed back the ACK of the previous PPDU while the first device sends the second PPDU, thereby further saving the overhead of channel detection.

In addition, the channel detecting method shown in FIG. 6 to FIG. 11 may receive channel information while transmitting a PPDU, and send a first message, a second message, or a third message while receiving an ACK, based on a full duplex communication manner. At least one of the modes further reduces the time unit occupied by the channel sounding, and reduces the overhead of channel sounding.

Referring to FIG. 12, FIG. 12 is a schematic structural diagram of a channel detecting apparatus according to an embodiment of the present invention. As shown in FIG. 12, the channel detecting apparatus may include:

The processing module 1301 is configured to generate a physical layer protocol data unit PPDU, where the PPDU includes a precoded data field and a long training field that is not precoded;

The communication module 1302 is configured to send the PPDU, where the second device performs channel estimation according to the long training field.

In a possible implementation manner, when the long training field is used for channel estimation by a target receiving station of a data field in the PPDU, the second device is included in the target receiving station; when the long When the training field is not used for channel estimation by the target receiving station of the data field in the PPDU, the second device is not included in the target receiving station.

In a possible implementation manner, before the sending, by the communications module, the PPDU, the communications message is further configured to send a first message, where the first message includes first identifier information;

The first message is used to indicate that the second device indicated by the first identifier information performs channel estimation according to the long training field.

In a possible implementation manner, the PPDU further includes second identifier information, where the second identifier information is used to indicate a second device in the second device that feeds back channel information while the PPDU is transmitted. The channel information is obtained by performing channel estimation according to the long training field by the second device indicated by the second identifier information.

In a possible implementation manner, the communications module is further configured to receive the channel information while the PPDU is transmitted.

In a possible implementation, when the channel information is a channel quality indicator, the processing module 1303 is further configured to: after the communication module 1302 receives the channel information while the PPDU is being transmitted, according to the channel quality. Determining, by the second device, the device that needs to feed back the channel indication information, where the second device that needs to feed back the channel indication information is included in the second device indicated by the second identifier information;

The communication module 1302 is further configured to send a second message, where the second message includes third identifier information, where the third identifier information is used to indicate the second device that needs to feed back channel indication information;

In a possible implementation, the PPDU further includes a subframe, where the subframe includes second identifier information, where the subframe is used to indicate that the second identifier information is indicated by the second identifier information in the second device. The second device feeds back channel information, where the channel information is obtained by the second device indicated by the second identifier information according to the long training field.

In a possible implementation manner, after the sending, by the communications module, the PPDU, the third message is further configured to send a third message, where the third message includes second identifier information, where the third message is used to indicate the second The second device feedback channel information indicated by the second identifier information in the device, where the channel information is obtained by the second device indicated by the second identifier information according to the long training field.

In a possible implementation manner, the communications module is further configured to receive the channel information.

Referring to FIG. 13, FIG. 13 is a schematic structural diagram of another channel detecting apparatus according to an embodiment of the present disclosure. The channel detecting apparatus may be disposed in a second device. As shown in FIG. 13, the channel detecting apparatus may include:

The channel detecting device is disposed in a second device, and the channel detecting device includes:

The communication module 1401 is configured to receive a physical layer protocol data unit PPDU, where the PPDU includes a precoded data field and a long training field that is not precoded;

The processing module 1402 is configured to perform channel estimation according to the long training field.

In a possible implementation manner, the processing module is specifically configured to: when the indication information indicates that the long training field is used by a target receiving station in a data field in the PPDU for channel estimation, and the second device includes And performing channel estimation according to the long training field; and indicating, in the indication information, that the long training field is not used by a target receiving station in a data field in the PPDU for channel estimation, and the When the two devices are not included in the target receiving station, channel estimation is performed according to the long training field.

In a possible implementation manner, the communications module is further configured to receive a first message, where the first message includes first identifier information, where the first identifier information is used to indicate channel estimation according to the long training field. device of;

The processing module is specifically configured to perform the operation of performing channel estimation according to the long training field when the second device is included in the device indicated by the first identifier information.

In a possible implementation, the PPDU further includes second identifier information, where the second identifier information is used to indicate a device that feeds back channel information while the PPDU is transmitted, and the channel information is the second The device indicated by the identification information is obtained by performing channel estimation according to the long training field.

In a possible implementation manner, the communication module is further configured to: when the second device is included in the device indicated by the second identifier information, send channel information while receiving the PPDU, The channel information is obtained by the processing module performing channel estimation according to the long training field.

In a possible implementation manner, when the channel information is a channel quality indicator, the communications module is further configured to: after receiving the PPDU, send the channel information, and receive the second message, where the second message includes a third identifier information, where the third identifier information is used to indicate a device that needs to feed back channel indication information, where the second device that needs to feed back channel indication information is included in the second device indicated by the second identifier information; When the second device is included in the device indicated by the third identifier information, the channel indication information is sent, and the channel indication information is obtained by the second device performing channel estimation according to the long training field.

In a possible implementation manner, the communications module is further configured to: after the processing module performs channel estimation according to the long training field, receive a third message, where the third message includes second identifier information, where The third message is used to indicate the device feedback channel information indicated by the second identifier information, where the channel information is obtained by the device indicated by the second identifier information according to the long training field.

In a possible implementation manner, the communication module is further configured to: when the second device is included in a device indicated by the second identifier information, send the channel information, where the channel information is The processing module obtains channel estimation according to the long training field.

Please refer to FIG. 14. FIG. 14 is a schematic structural diagram of an apparatus according to an embodiment of the present disclosure. As shown in FIG. 14, the apparatus may be a terminal device or a network device, or may be a chip or a circuit, for example, may be configured to be connected. Point of chip or circuit. The device may correspond to the first device or the second device in the above method. The apparatus can include a processor 110 and a memory 120. The memory 120 is configured to store instructions for executing the instructions stored in the memory 120 to implement the steps of the first device or the second device in the channel detecting method corresponding to FIG. 3 to FIG.

Further, the device may further include a receiver 140 and a transmitter 150, where the receiver 140 and the transmitter 150 are configured to support communication between the second device and the first device, and may perform the first device involved in the foregoing method or Communication or interaction process of the second device and/or other processes for the techniques described herein. Further, the apparatus may further include a bus system 130, wherein the processor 110, the memory 120, the receiver 140, and the transmitter 150 may be connected by the bus system 130.

The processor 110 is configured to execute instructions stored in the memory 120 to control the receiver 140 to receive signals and control the transmitter 150 to transmit signals to complete the steps of the first device or the second device in the above method. The receiver 140 and the transmitter 150 may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as transceivers. The memory 220 may be integrated in the processor 210 or may be provided separately from the processor 210.

For example, when the apparatus is configured to implement the functionality of the first device, the processor 110 can be configured to generate a physical layer protocol data unit including the precoded data field and the non-precoded long training field, the transmitter 150 can be configured to transmit The physical layer protocol data unit memory 120 can include instructions sufficient to allow the processor 110 to generate physical layer protocol data units including pre-coded data fields and non-precoded long training fields, and can also include sufficient to allow the processing 110 to schedule transmissions The device 150 sends an instruction of the physical layer protocol data unit;

For another example, when the apparatus is configured to implement the function of the second device, the processor 110 may be configured to perform channel estimation according to the long training field that is not precoded, and the receiver 140 may be configured to receive the physical layer protocol data unit, where the memory 120 There may be instructions sufficient to allow the processor 110 to perform channel estimation based on a long training field that has not been precoded, and may also include instructions sufficient to allow the processor to schedule the receiver 140 to receive the physical layer protocol data unit.

As an implementation, the functions of the receiver 140 and the transmitter 150 can be implemented by a dedicated chip through a transceiver circuit or a transceiver. The processor 110 can be implemented by a dedicated processing chip, a processing circuit, a processor, or a general purpose chip.

As another implementation manner, the second device provided by the embodiment of the present application, such as the station STA201 or the STA 203 in FIG. 1 , may be implemented by using a general-purpose computer. The program code that is to implement the functions of the processor 110, the receiver 140 and the transmitter 150 is stored in a memory, and the general purpose processor implements the functions of the processor 110, the receiver 140 and the transmitter 150 by executing the code in the memory.

It is to be understood that FIG. 14 only shows a simplified design of the device. In practical applications, the device may include any number of transceivers, processors, memories, etc., and all of the technical solutions of the embodiments of the present application may be implemented. The devices are all within the scope of this application.

For the concepts, explanations, detailed descriptions and other steps related to the technical solutions provided by the embodiments of the present application, refer to the descriptions of the foregoing methods or other embodiments, and no further details are provided herein.

Alternatively, the apparatus can also be configured as a general purpose processing system, such as generally referred to as a chip, the general purpose processing system comprising: one or more microprocessors providing processor functionality; and external memory providing at least a portion of the storage medium, all These are all connected to other support circuits through an external bus architecture.

FIG. 15 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure. The terminal device may be the second device in the embodiment of the present application, for example, STA 201 to STA 204 shown in FIG. 2 . For the convenience of explanation, FIG. 15 shows only the main components of the terminal device. As shown in FIG. 15, the terminal device includes a processor, a memory, a control circuit, an antenna, and an input/output device. The processor is mainly used for processing the communication protocol and the communication data, and controlling the entire terminal device, executing the software program, and processing the data of the software program, for example, the second embodiment in the related embodiment for supporting the terminal device to perform the above channel detecting method. The action described by the device. The memory is primarily used to store software programs and data, such as storing any one or more of the PPDUs or channel information described in the above embodiments. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals. The control circuit together with the antenna can also be called a transceiver, and is mainly used for transmitting and receiving RF signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are primarily used to receive user input data and output data to the user.

After the terminal device is powered on, the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When the data needs to be transmitted by wireless, the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal, and then sends the radio frequency signal to the outside through the antenna in the form of electromagnetic waves. When data is transmitted to the terminal device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor, which converts the baseband signal into data and processes the data.

Those skilled in the art will appreciate that FIG. 15 shows only one memory and processor for ease of illustration. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like.

As an optional implementation manner, the processor may include a baseband processor and a central processing unit, and the baseband processor is mainly used to process the communication protocol and the communication data, and the central processing unit is mainly used to control and execute the entire terminal device. A software program that processes data from a software program. The processor in FIG. 15 integrates the functions of the baseband processor and the central processing unit. Those skilled in the art can understand that the baseband processor and the central processing unit can also be independent processors and interconnected by technologies such as a bus. Those skilled in the art will appreciate that the terminal device may include a plurality of baseband processors to accommodate different network standards, and the terminal device may include a plurality of central processors to enhance its processing capabilities, and various components of the terminal devices may be connected through various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The functions of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.

Exemplarily, in the embodiment of the invention, the antenna and control circuit having the transceiving function can be regarded as the transceiving unit 101 of the terminal device, and the processor having the processing function is regarded as the processing unit 102 of the terminal device. As shown in FIG. 15, the terminal device includes a transceiver unit 101 and a processing unit 102. The transceiver unit can also be referred to as a transceiver, a transceiver, a transceiver, and the like. Optionally, the device for implementing the receiving function in the transceiver unit 101 can be regarded as a receiving unit, and the device for implementing the sending function in the transceiver unit 101 is regarded as a sending unit, that is, the transceiver unit 101 includes a receiving unit and a sending unit. The receiving unit may also be referred to as a receiver, a receiver, a receiving circuit, etc., and the transmitting unit may be referred to as a transmitter, a transmitter, or a transmitting circuit.

Referring to FIG. 16, FIG. 16 is a schematic structural diagram of a network device according to an embodiment of the present disclosure, which may be a schematic structural diagram of a base station or other access points. As shown in Figure 16. The network device may be the first device in the above method, such as the access point AP 101 in the system as shown in FIG. 2. The network device can include one or more radio frequency circuits, such as a remote radio frequency circuit 1040 and one or more baseband circuits (also referred to as digital units, DUs) 1030. The radio frequency circuit 1040 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 1050 and a radio frequency circuit 1040. The RF circuit 1040 is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals and baseband signals, for example, for transmitting a PPDU, a first message, a second message, or a third message. The baseband circuit 1030 portion is primarily used for baseband processing. The radio frequency circuit 1040 and the baseband circuit 1030 may be physically disposed together or physically separated, that is, distributed base stations. The baseband circuit 1030 is mainly used to perform baseband processing functions such as channel coding, multiplexing, modulation, spreading, and the like.

In an example, the baseband circuit 1030 may be composed of one or more single boards, and multiple boards may jointly support a single access system radio access network (such as an LTE network), or may support different access systems respectively. Wireless access network. The baseband circuit 1030 also includes a memory 1020 and a processor 1010. The memory 1020 is used to store necessary instructions and data. For example, the memory 1020 stores the mapping relationship and the like in the above embodiment. The processor 1010 is configured to control the network device to perform necessary actions, for example, to control the network device to perform an operation procedure of the network device in the foregoing method embodiment. The memory 1020 and the processor 1010 can serve one or more boards. That is, the memory and processor can be individually set on each board. It is also possible that multiple boards share the same memory and processor. In addition, the necessary circuits can be set on each board.

The above circuits or devices may be connected by a bus 1060.

It should be understood that, in the embodiment of the present application, the processor may be a central processing unit ("CPU"), and the processor may also be other general-purpose processors, digital signal processors (DSPs), and dedicated integration. Circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory can include read only memory and random access memory and provides instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory.

The bus system may include a power bus, a control bus, and a status signal bus in addition to the data bus. However, for the sake of clarity, the various buses are labeled as bus systems in the figure.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

According to the method provided by the embodiment of the present application, the embodiment of the present application further provides a communication system, including the foregoing one or more network devices and one or more terminal devices.

The apparatus involved in the embodiments of the present application may also be a general-purpose processing system, such as generally referred to as a chip, the general-purpose processing system including: one or more microprocessors providing processor functions; and an external memory providing at least a portion of the storage medium, All of this is connected to other support circuits through an external bus architecture.

It is also to be understood that the first, second, third, fourth,

It should be understood that, in various embodiments of the present application, the size of the serial numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention. The implementation process constitutes any limitation.

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. achieve. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with the present application are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center via wired (eg, coaxial cable, fiber optic, digital subscriber line) or wireless (eg, infrared, wireless, microwave, etc.). The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state hard disk).

Claims

A channel detecting method, comprising:

The first device generates a physical layer protocol data unit PPDU, where the PPDU includes a precoded data field and a long training field that is not precoded;

The first device sends the PPDU, and is used by at least one second device to perform channel estimation according to the long training field.
The method according to claim 1, wherein the PPDU further comprises indication information, the indication information is used to indicate whether the long training field is used for a target receiving station of a data field in the PPDU for channel estimation; Alternatively, the indication information is used to indicate whether a target receiving station of the data field in the PPDU performs channel estimation according to the long training field.
The method according to claim 2, wherein when the long training field is used for channel estimation by a target receiving station of a data field in the PPDU, the at least one second device is included in the target receiving station The at least one second device is not included in the target receiving station when the long training field is not used for channel estimation by a target receiving station of a data field in the PPDU.
The method according to any one of claims 1 to 3, wherein before the sending, by the first device, the PPDU, the method further comprises:

The first device sends a first message, where the first message includes first identifier information;

The first message is used to indicate that the at least one second device indicated by the first identifier information performs channel estimation according to the long training field.
The method according to any one of claims 1 to 4, wherein the non-precoded long training field is included in a physical layer preamble of the PPDU.
The method according to claim 5, wherein the PPDU further comprises second identification information,

The second identifier information is used to indicate a second device that feeds back channel information in the at least one second device while the PPDU is transmitted, where the channel information is a second device indicated by the second identifier information. The long training field is obtained by channel estimation.
The method of claim 6 wherein the method further comprises:

The first device receives the channel information while the PPDU is transmitted.
A channel detecting method, comprising:

The second device receives a physical layer protocol data unit PPDU, where the PPDU includes a precoded data field and a long training field that is not precoded;

The second device performs channel estimation according to the long training field.
The method according to claim 8, wherein the PPDU further comprises indication information, the indication information is used to indicate whether the long training field is used for a target receiving station of a data field in the PPDU for channel estimation; Alternatively, the indication information is used to indicate whether a target receiving station of the data field in the PPDU performs channel estimation according to the long training field.
The method according to claim 9, wherein the second device indicates, in the indication information, that the long training field is used for a target receiving station of a data field in the PPDU for channel estimation and the second device Channel estimation according to the long training field when included in the target receiving station; and channel estimation in the indication information indicating that the long training field is not used by a target receiving station in a data field in the PPDU When the second device is not included in the target receiving station, channel estimation is performed according to the long training field.
The method according to any one of claims 8 to 10, wherein the method further comprises:

Receiving, by the second device, the first message, where the first message includes first identifier information, where the first identifier information is used to indicate a device that performs channel estimation according to the long training sequence;

The second device performs channel estimation according to the long training field, and includes:

When the second device is included in the device indicated by the first identification information, performing channel estimation according to the long training field.
The method according to any one of claims 8 to 11, wherein the non-precoded long training field is included in a physical layer preamble of the PPDU.
The method according to claim 12, wherein the PPDU further comprises second identification information,

The second identifier information is used to indicate a device that feeds back channel information while the PPDU is transmitted, and the channel information is obtained by performing, by the device indicated by the second identifier information, channel estimation according to the long training field.
The method according to claim 13, wherein when the second device is included in the device indicated by the second identification information, the method further includes:

The second device sends channel information while receiving the PPDU, and the channel information is obtained by the second device performing channel estimation according to the long training field.
A channel detecting device, comprising:

a processing module, configured to generate a physical layer protocol data unit PPDU, where the PPDU includes a precoded data field and a long training field that is not precoded;

And a communication module, configured to send the PPDU, where the at least one second device performs channel estimation according to the long training field.
The apparatus according to claim 15, wherein the PPDU further comprises indication information, the indication information is used to indicate whether the long training field is used for a target receiving station of a data field in the PPDU for channel estimation; Alternatively, the indication information is used to indicate whether a target receiving station of the data field in the PPDU performs channel estimation according to the long training field.
The apparatus according to claim 16, wherein when said long training field is used for channel estimation by a target receiving station of a data field in said PPDU, said at least one second device is included in said target receiving station The at least one second device is not included in the target receiving station when the long training field is not used for channel estimation by a target receiving station of a data field in the PPDU.
The device according to any one of claims 15 to 17, wherein the communication module is further configured to send a first message before the PPDU is sent, where the first message includes first identifier information;

The first message is used to indicate that the at least one second device indicated by the first identifier information performs channel estimation according to the long training field.
The apparatus according to any one of claims 15 to 18, wherein the non-precoded long training field is included in a physical layer preamble of the PPDU.
The device according to claim 19, wherein the PPDU further comprises second identification information,

The second identifier information is used to indicate a second device that feeds back channel information in the at least one second device while the PPDU is transmitted, where the channel information is a second device indicated by the second identifier information. The long training field is obtained by channel estimation.
The apparatus according to claim 20, wherein said communication module is further configured to receive said channel information while said PPDU is transmitted.
A channel detecting apparatus, wherein the channel detecting apparatus is disposed in a second device, where the channel detecting apparatus comprises:

a communication module, configured to receive a physical layer protocol data unit PPDU, where the PPDU includes a precoded data field and a long training field that is not precoded;

And a processing module, configured to perform channel estimation according to the long training field.
The apparatus according to claim 22, wherein the PPDU further comprises indication information, the indication information is used to indicate whether the long training field is used for a target receiving station of a data field in the PPDU for channel estimation; Alternatively, the indication information is used to indicate whether a target receiving station of the data field in the PPDU performs channel estimation according to the long training field.
The apparatus according to claim 23, wherein the processing module is specifically configured to: when the indication information indicates that the long training field is used for channel estimation by a target receiving station of a data field in the PPDU, When the second device is included in the target receiving station, performing channel estimation according to the long training field; and performing channel estimation on the target receiving station where the indication information indicates that the long training field is not used in a data field in the PPDU And when the second device is not included in the target receiving station, channel estimation is performed according to the long training field.
The device according to any one of claims 22 to 24, wherein the communication module is further configured to receive a first message, where the first message includes first identification information, and the first identification information is used to indicate a device for performing channel estimation based on the long training field;

The processing module is specifically configured to perform channel estimation according to the long training field when the second device is included in the device indicated by the first identifier information.
The apparatus according to any one of claims 22 to 25, wherein the non-precoded long training field is included in a physical layer preamble of the PPDU.
The device according to claim 26, wherein the PPDU further comprises second identification information,

The second identifier information is used to indicate a device that feeds back channel information while the PPDU is transmitted, and the channel information is obtained by performing, by the device indicated by the second identifier information, channel estimation according to the long training field.
The device according to claim 27, wherein the communication module is further configured to: when the second device is included in the device indicated by the second identification information, send a channel while receiving the PPDU Information, the channel information is obtained by the processing module performing channel estimation according to the long training field.
An apparatus, comprising: a processor for storing instructions, the processor for executing instructions in a memory to perform the method of any one of claims 1 to 14. .
A computer readable storage medium, for storing a computer program, when the computer program is run on a computer, causing the computer to perform any one of claims 1 to The method described in the item.
A computer program product, comprising: instructions for performing the method of any one of claims 1 to 14.
A device for carrying out the method of any one of claims 1 to 14.