CN107645737B

CN107645737B - Channel measurement method, wireless communication device and equipment

Info

Publication number: CN107645737B
Application number: CN201610587653.3A
Authority: CN
Inventors: 张博; 吕开颖; 邢卫民
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-07-21
Filing date: 2016-07-21
Publication date: 2022-06-10
Anticipated expiration: 2036-07-21
Also published as: CN107645737A

Abstract

The embodiment of the invention discloses a channel measurement method, which is applied to a first wireless communication device and comprises the following steps: receiving a data unit frame sent by a second wireless communication device, wherein the data unit frame at least comprises a channel measurement sequence and a data field; analyzing the data unit frame to obtain the channel measurement sequence; and performing channel measurement based on the channel measurement sequence. The embodiment of the invention also discloses a wireless communication device and equipment.

Description

Channel measurement method, wireless communication device and equipment

Technical Field

The present invention relates to the field of Wireless Local Area Networks (WLANs), and in particular, to a channel measurement method, a Wireless communication device, and a device.

Background

Currently, in a general WLAN communication system, at least one of a transmitting side and a receiving side uses a multi-antenna communication technology, such as a Single-Input-Multiple-Output (SIMO) technology, a Multiple-Input-Single-Output (MISO) technology, a (MIMO) technology, or the like.

In a WLAN communication system applying a multi-antenna technology, a transmitting side can improve the directivity of a transmitting data unit by beamforming to improve the performance of a receiving side. Generally, beamforming is performed by a transmitting device using a spatial gain pattern matrix with one or more side lobes, and the transmitting device has better directivity, more concentrated energy, and relatively reduced signal energy in other directions compared to an omni-directional transmitting mode. If the transmitter uses a beamforming matrix with high gain sidelobes, the multi-antenna communication system can obtain more reliable transmission compared to the single-antenna communication system.

Particularly, when WLAN stations communicate with each other, a transmitting station needs to know channel information of itself and a receiving station, and the transmitting station can perform beamforming on a transmitted data unit by using the channel information, so as to improve the receiving performance of the receiving station. According to the rule that stations defined in the 802.11 series protocols use channel information to perform beamforming, the 802.11 protocol specifies a channel measurement process, wherein a beamforming initiator (Beamformer) of a sending station first sends a Null Data Packet Announcement (NDPA) frame to initiate channel measurement, and then sends a Null Data Packet (NDP) frame to perform channel measurement, a beamforming receiver (Beamformer) of a receiving station obtains channel information through training symbols in the NDP frame and feeds back the channel information to the sending station Beamformer, and the sending station Beamformer uses channel information fed back by the receiving station Beamformer to be applied to a Data unit through beamforming, so as to improve the performance of the receiving station to receive the Data unit.

However, with the explosive application of the WLAN, the deployment of the WLAN is increasingly dense, and the WLAN supports an outdoor scenario, and beamforming becomes extremely important in data transmission, however, in the case of increasing the number of stations, each station performs a channel measurement process, and if a conventional NDPA/NDP measurement sequence is used, a large overhead is incurred for the whole Basic Service Set (BSS), which reduces the data transmission efficiency of the system.

Disclosure of Invention

In view of the above, embodiments of the present invention are to provide a method, an apparatus, and a network device for channel measurement, so as to reduce overhead of a wireless communication system caused by channel measurement and improve data transmission efficiency of the wireless communication system.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

in a first aspect, an embodiment of the present invention provides a channel measurement method, which is applied to a first wireless communication apparatus, and the method includes: receiving a data unit frame sent by a second wireless communication device, wherein the data unit frame at least comprises a channel measurement sequence and a data field; analyzing the data unit frame to obtain the channel measurement sequence; and performing channel measurement based on the channel measurement sequence.

In a second aspect, an embodiment of the present invention provides a channel measurement method, applied to a second wireless communication apparatus, where the method includes: obtaining first indication information for indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field; generating a data unit frame according to the first indication information, wherein the data unit frame at least comprises the channel measurement sequence and the data field; transmitting the data unit frame to the first wireless communication device.

In a third aspect, an embodiment of the present invention provides a wireless communication apparatus, including: a first receiving unit, configured to receive a data unit frame sent by a second wireless communication apparatus, where the data unit frame at least includes a channel measurement sequence and a data field; the analyzing unit is used for analyzing the channel measurement data unit frame to obtain the channel measurement sequence; and the measuring unit is used for carrying out channel measurement based on the channel measurement sequence.

In a fourth aspect, an embodiment of the present invention provides a wireless communication apparatus, including: a second obtaining unit, configured to obtain first indication information indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field; a generating unit, configured to generate a data unit frame according to the first indication information, where the data unit frame at least includes the channel measurement sequence and the data field; a third transmitting unit configured to transmit the data unit frame to the first wireless communication apparatus.

In a fifth aspect, an embodiment of the present invention provides an AP, including: a first receiver, configured to receive a data unit frame sent by a station STA, where the data unit frame at least includes a channel measurement sequence and a data field; the first processor is used for analyzing the channel measurement data unit frame to obtain the channel measurement sequence; and performing channel measurement based on the channel measurement sequence.

In a sixth aspect, an embodiment of the present invention provides an STA, including: a second processor for obtaining first indication information indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field; generating a data unit frame according to the first indication information, wherein the data unit frame at least comprises the channel measurement sequence and the data field; a second transmitter for transmitting the data unit frame to the first wireless communication device.

The embodiment of the invention provides a method, a device and equipment for measuring a channel, wherein first, a first wireless communication device receives a data unit frame sent by a second wireless communication device, and the data unit frame at least comprises a channel measurement sequence and a data field; then, analyzing the data unit frame to obtain a channel measurement sequence; next, channel measurements are made based on the channel measurement sequence. Therefore, the channel measurement sequence is carried in the data unit frame, so that the first wireless communication device can complete channel measurement while transmitting data, thereby reducing the additional overhead of channel measurement in the wireless communication system and improving the data transmission efficiency of the wireless communication system. Particularly, in the next generation wireless communication system, if the AP completes channel sounding while transmitting data, after the channel sounding is completed, the AP may flexibly perform RU resource allocation or perform beamforming on a data unit, so as to improve the receiving performance of a channel receiving end.

Drawings

Fig. 1 is a schematic structural diagram of a WLAN communication system according to a first embodiment of the present invention;

FIG. 2 is a flowchart illustrating a method for channel measurement according to a first embodiment of the present invention;

fig. 3 is a flowchart illustrating a channel measurement method according to a second embodiment of the present invention;

FIG. 4 is a diagram illustrating a data unit frame according to a second embodiment of the present invention;

FIG. 5 is another diagram of a data unit frame according to a second embodiment of the present invention;

FIG. 6 is a diagram of a data unit frame according to a third embodiment of the present invention;

FIG. 7 is another diagram of a data unit frame according to a third embodiment of the present invention;

fig. 8 is a flowchart illustrating a channel measurement method according to a fourth embodiment of the present invention;

FIG. 9 is a diagram illustrating a data unit frame according to a fourth embodiment of the present invention;

fig. 10 is a diagram of STA1 and STA2 data unit frames in a sixth embodiment of the present invention;

fig. 11 is a schematic structural diagram of a wireless communication device according to a seventh embodiment of the present invention;

fig. 12 is a schematic structural diagram of a wireless communication device according to an eighth embodiment of the present invention;

FIG. 13 is a diagram illustrating an AP according to a ninth embodiment of the present invention;

fig. 14 is a schematic structural diagram of an STA in the tenth embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The first embodiment is as follows:

the present embodiment provides a WLAN communication system, and referring to fig. 1, the system 10 may include: a first wireless communication device 11 and a second wireless communication device 12.

In practical applications, the first wireless communication apparatus 11 may be a STAtion (STA) in the WLAN network, or an AP in the WLAN network; accordingly, the second wireless communication device may be a STA in the WLAN network or an AP in the WLAN network. Of course, the first wireless communication device and the second wireless communication device may also be both STAs or APs in the WLAN network, and the embodiment of the present invention is not limited in particular.

The following describes the channel measurement method provided by the embodiment of the present invention in detail with reference to the above system.

Fig. 2 is a flowchart illustrating a method for channel measurement according to a first embodiment of the present invention, referring to fig. 2, the method includes:

s201: the second wireless communication device obtains first indication information indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field;

here, the data field refers to data or payload transmitted to the physical layer by the upper layer.

In a specific implementation, the second wireless communication device may obtain the first indication information in the following two ways, without limitation.

First, the first indication information is indicated by the first wireless communication apparatus, and before S201, the method further includes: the first wireless communication device transmitting a trigger frame to the second wireless communication device;

here, the trigger frame includes at least first indication information indicating a bandwidth of the channel measurement sequence and a bandwidth of the data field, and the bandwidth of the channel measurement sequence is greater than or equal to the bandwidth of the data field.

In practical applications, the first wireless communications device may determine the bandwidth granularity of the channel measurement sequence based on Resource Unit (RU) allocation or subband bandwidth allocation. For example, a 26-tone RU contains 26 data subcarriers, a 52-tone RU contains 52 data subcarriers, and a subband bandwidth is a division of a 20MHz bandwidth into 5MHz subband bandwidth granularity or 2.5MHz subband bandwidth granularity, or into two 20MHz subband granularity with a 40MHz bandwidth.

In other embodiments of the present invention, the first indication information may specifically include a field indicating a bandwidth of a channel measurement sequence and a field indicating a bandwidth of a data field, and at this time, the second wireless communication apparatus parses the trigger frame, so as to know the bandwidth indicated for the channel measurement sequence and the bandwidth indicated for the data field, and at this time, the bandwidth of the channel measurement sequence is greater than or equal to the bandwidth of the data field; of course, the first indication information may be specifically a field for indicating the number of measurement layers or streams of the channel measurement sequence and indicating the bandwidth of the data field, and in this case, the second wireless communication apparatus can know that the bandwidth indicated for the channel measurement sequence is the same as the bandwidth indicated for the data field by analyzing the trigger frame.

In other embodiments of the present invention, the WLAN communication system may further include a third wireless communication device, where the third wireless communication device may be an STA or an AP in the WLAN network, and is consistent with the second wireless communication device.

Here, the trigger frame may further include second indication information indicating a bandwidth of a channel measurement sequence of the third wireless communication apparatus and a bandwidth of a data field, in which case the bandwidth of the channel measurement sequence of the third wireless communication apparatus is greater than or equal to the bandwidth of the data field of the third wireless communication apparatus. Here, the second indication message is similar to the first indication message, and is not described in detail herein.

Then, the first wireless communication device may send the trigger frame to the second wireless communication device and may also send the first trigger frame to the third wireless communication device, so that the first wireless communication device may indicate the bandwidths of the channel measurement sequences and the bandwidths of the data fields of the multiple wireless communication devices through one trigger frame at the same time, where the number of the multiple wireless communication devices in the WLAN communication system is not specifically limited, and is greater than or equal to two, and the embodiment of the present invention is not specifically limited.

Further, the trigger frame may further include third indication information for indicating the number of measurement layers or the number of streams of the channel measurement sequence; here, the third indication information may be independent of the first indication information, or may be a part of the first indication information, and the embodiment of the present invention is not particularly limited.

Secondly, the first indication information is self-indicated by the second wireless communication apparatus, and then before S201, the method further includes: accessing a channel through random contention; the first indication information may be obtained according to a bandwidth of the channel, for example, the first indication message may include an RU or a subband bandwidth instructing the second wireless communication apparatus to transmit the preamble part using a full bandwidth, the preamble part including a channel measurement sequence bandwidth, and the data field using a partial bandwidth.

Here, the second wireless communication apparatus obtains the channel resource through random contention, and then determines the bandwidth of the channel measurement sequence and the bandwidth of the data field according to a preset bandwidth allocation rule based on the bandwidth of the accessed channel, where the bandwidth of the channel measurement sequence is greater than or equal to the bandwidth of the data field.

S202: the second wireless communication device generates a data unit frame according to the first indication information;

here, the data unit frame refers to a data frame sent to an air interface by a physical layer, and the data unit frame at least includes a channel measurement sequence and a data field;

specifically, the Data unit frame may include two parts, i.e., a preamble part in which a channel measurement sequence is contained and a Data field (Data), and may further include signaling fields such as a legacy short training sequence (L-STF), a legacy long training sequence (L-LTF), a legacy signaling field (L-SIG), a repeated signaling field (RL-SIG), a high efficiency signaling (HE-SIG-a) field, and the like.

In practical application, the channel measurement sequence may be a high efficiency short training field (HE-STF) or a high efficiency long training field (HE-LTF); a high efficiency long training field (CM-HE-LTF) may also be measured for the channel; of course, other training fields may also be used, and the embodiment of the present invention is not particularly limited.

In particular, when the trigger frame includes the third indication information, the data unit frame also includes the third indication information accordingly.

S203: the second wireless communication device transmitting the data unit frame to the first wireless communication device;

here, the second wireless communication apparatus performs one or more of padding, scrambling, encoding, stream parsing, interleaving, modulation mapping, cyclic time shifting, inverse fast fourier transform, guard interval addition, and windowing on the data unit to obtain a data unit frame, and transmits the data unit frame to the first wireless communication apparatus.

Optionally, the second wireless communication apparatus may transmit the channel measurement sequence in an omnidirectional manner; the second wireless communication apparatus may transmit the data field in an omnidirectional manner or a beamforming manner, which is based on practical application, and the embodiment of the present invention is not limited specifically.

S204: the first wireless communication device analyzes the data unit frame to obtain a channel measurement sequence;

here, the first radio communication apparatus receives a signal by MIMO, SIMO, MISO, or the like, obtains a data unit frame by energy detection, symbol synchronization, or the like with respect to the received signal, and then analyzes the data unit by performing processing such as fast fourier transform, a guard interval removal, a cyclic time shift removal, signal demodulation, decoding, and descrambling, to obtain a channel measurement sequence.

Further, the first wireless communication device may also obtain signaling information therein by parsing the data unit frame.

S205: the first wireless communication device performs channel measurement based on the channel measurement sequence.

Here, after the first wireless communication apparatus obtains the channel measurement sequence, the first wireless communication apparatus may perform channel quality measurement using the channel measurement sequence to obtain channel quality of a channel with the second wireless communication apparatus, and at this time, the channel quality is used for RU allocation to the second wireless communication apparatus.

In an implementation, the first wireless communication device may perform channel quality measurement using the channel measurement sequence to obtain RU-based channel quality, such as Signal-to-Noise Ratio (SNR), where each data stream of each RU obtains an SNR that can be used for next RU allocation of the first station STA.

In addition, after the first wireless communication device obtains the channel measurement sequence, the first wireless communication device may further perform channel measurement by using the channel measurement sequence to obtain an expected bandwidth estimation channel; estimating a channel according to the expected bandwidth to obtain a beam forming matrix; and sending the beam forming matrix to the second wireless communication device, wherein the beam forming matrix is used for indicating the second wireless communication device to carry out beam forming.

In a specific implementation process, the step of obtaining the beamforming matrix according to the desired bandwidth estimation channel may be to obtain the beamforming matrix by performing Singular Value Decomposition (SVD) on the desired bandwidth estimation channel.

In another embodiment of the present invention, when the data unit frame includes the third indication information, the first wireless communication device obtains the channel measurement sequence and the third indication information after parsing the data unit frame; then, channel measurement is performed based on the channel measurement sequence and the third indication information.

To this end, the WLAN communication system completes channel measurement while transmitting data.

In other embodiments of the present invention, the data unit frame may further include a channel estimation sequence; the above method may further comprise: channel estimation is performed using the channel estimation sequence to detect the data field.

Here, the channel estimation sequence may be a portion of the channel measurement sequence corresponding to the data field, and at this time, the channel estimation sequence and the channel measurement sequence coincide in a time domain; or, the channel estimation sequence is a field adjacent to the channel measurement sequence in the time domain, and the bandwidth of the channel estimation sequence is the same as the bandwidth of the data field.

In this embodiment, since the channel measurement sequence is carried in the data unit frame, the first wireless communication device can complete channel measurement while transmitting data, so as to reduce the overhead of channel measurement in the wireless communication system and improve the data transmission efficiency of the wireless communication system. Particularly, in the next generation wireless communication system, if the AP completes channel sounding while transmitting data, after the channel sounding is completed, the AP may flexibly perform RU resource allocation or perform beamforming on a data unit, so as to improve the receiving performance of a channel receiving end.

Example two:

based on the foregoing embodiments, the present embodiment takes the AP and the STA to perform channel measurement as an example, and describes the channel measurement method in the first embodiment.

Fig. 3 is a flowchart illustrating a method for channel measurement according to a second embodiment of the present invention, referring to fig. 3, the method includes:

s301: the AP sends a trigger frame to the STA;

here, the trigger frame may indicate signaling information such as transmission power required for the STA to transmit the data unit frame, a data unit length, RU allocation, and a channel bandwidth required to be measured by the STA; in practical application, the trigger frame may further include other signaling information, and the embodiment of the present invention is not specifically limited.

S302: the STA analyzes the signaling information in the trigger frame to obtain the channel bandwidth to be measured;

here, the above-mentioned channel bandwidth to be measured is a bandwidth of a channel measurement sequence indicated to the STA by the AP, and the bandwidth of the channel measurement sequence is greater than or equal to a bandwidth of a data field in a data unit frame, that is, an RU bandwidth in which the STA transmits data.

S303: the STA generates a data unit frame according to the channel bandwidth required to be measured;

here, referring to fig. 4, the Data unit frame generated by the STA includes a preamble part, which may include L-STF, L-LTF, SIG, RL-SIG, HE-SIG-A, HE-STF, and HE-LTF, and a Data field (Data).

Further, the Data unit frame includes three parts of bandwidth information, which are shown in fig. 4, namely a Pre-HE preamble part (L-STF, L-LTF, SIG, RL-SIG, HE-SIG-a, and HE-STF), a channel measurement sequence part (HE-LTF), and a HE part (Data), respectively, where the bandwidth of the Pre-HE preamble part is the entire bandwidth, the bandwidth of the channel measurement sequence is the channel bandwidth required to be measured indicated by the AP, where the bandwidth of the HE-STF is consistent with the bandwidth of the HE-LTF, and the bandwidth of the HE part is the bandwidth used for Data transmission in the RU. Here, the bandwidth occupied by the channel measurement sequence is greater than the bandwidth of the data field. . Of course, in practical application, the bandwidth occupied by the channel measurement sequence may also be equal to the bandwidth of the data field

In other embodiments of the present invention, the position of the channel measurement sequence portion (HE-LTF) in the data unit frame may be as shown in fig. 5 in addition to fig. 4, that is, the channel measurement sequence is placed at the end of the data unit frame. Of course, there may be other situations where the channel measurement sequence part (HE-LTF) is located in the data unit frame, and the embodiment of the present invention is not particularly limited.

In other embodiments of the present invention, a portion of the channel measurement sequence portion corresponding to the data field may be used as a channel estimation sequence for channel estimation. At this time, the channel measurement sequence and the channel estimation sequence are coincident in the time domain.

S304: the STA sends a data unit frame to the AP;

s305: the AP analyzes the data unit frame to obtain a channel measurement sequence;

s306: the AP adopts HE-LTF to measure the channel quality, obtains the SNR of each RU and quantizes the SNR;

here, the AP may quantize the SNR by 6 bits-10 dB to 53dB, so that the AP may flexibly use the channel quality of an RU for the next RU allocation for the STA.

Alternatively, referring to the dotted line in fig. 3, after S305, the method may further include:

s307: the AP adopts the HE-LTF to measure the channel quality to obtain an expected bandwidth estimation channel H;

s308: the AP performs SVD on the channel H to obtain a beam forming matrix V, and quantizes the beam forming matrix V;

s309: and the AP sends the quantized beamforming matrix V to the STA.

S310: and the STA carries out beam forming on the data unit through the beam forming matrix V.

Example three:

based on the second embodiment, in this embodiment, referring to fig. 6, the Data unit frame generated by the STA includes a preamble and a Data field (Data), where the preamble may include L-STF, L-LTF, SIG, RL-SIG, HE-SIG-a, a channel measurement high-efficiency short training field (CM-HE-STF), a channel measurement high-efficiency long training field (CM-HE-LTF), HE-STF, and HE-LTF.

The Pre-HE preamble (L-STF, L-LTF, SIG, and RL-SIG) bandwidth is the total bandwidth, the channel measurement sequence (CM-HE-LTF) bandwidth is the channel bandwidth to be measured indicated by the AP, the channel estimation sequence (HE-STF and HE-LTF) is equal to the HE (Data) bandwidth, the CM-HE-STF and CM-HE-LTF bandwidths match, the HE-STF and HE-LTF bandwidths match, and the HE (Data) bandwidth is the bandwidth used for Data transmission in the RU. Here, the channel measurement sequence occupies a bandwidth larger than that of the data field, and is separated from the channel estimation sequence in the time domain. Of course, in practical application, the bandwidth occupied by the channel measurement sequence may also be equal to the bandwidth of the data field

In other embodiments of the present invention, the position of the channel measurement sequence portion (CM-HE-LTF) in the data unit frame may be as shown in fig. 7 in addition to fig. 6, that is, the channel measurement sequence is placed at the end of the data unit frame. Of course, there may be other situations where the channel measurement sequence portion (CM-HE-LTF) is located in the data unit frame, and the embodiment of the present invention is not particularly limited.

Accordingly, in the above method, the AP may perform channel quality measurement using the CM-HE-LTF.

It should be noted that, in this embodiment, the interaction between the AP and the STA is the same as that in the second embodiment, and is not described herein again.

Example four:

based on the foregoing embodiments, this embodiment takes the AP and a single STA to perform channel measurement as an example, and describes the channel measurement method in the first embodiment.

Fig. 8 is a flowchart illustrating a method for channel measurement according to a fourth embodiment of the present invention, referring to fig. 8, where the method includes:

s801: the STA accesses the channel through competition;

s802: the STA sends a single user data unit frame containing a channel measurement sequence;

here, the Single User Data Unit may represent a Protocol Data Unit (SU PPDU) for a Single User.

Here, referring to fig. 9, the Data unit frame generated by the STA includes a preamble part, which may include L-STF, L-LTF, SIG, RL-SIG, HE-SIG-A, HE-SIG-B, CM-HE-STF, CM-HE-LTF, HE-STF, and HE-LTF, and a Data field (Data).

It should be noted that, as shown in fig. 9, the bandwidth of the Pre-HE preamble portion (L-STF, L-LTF, SIG, RL-SIG, HE-SIG-a, and HE-SIG-B) is the total bandwidth, the bandwidth of the channel measurement sequence portion (CM-HE-LTF) is the channel bandwidth to be measured indicated by the AP, the bandwidth of the channel estimation sequence portion (HE-STF and HE-LTF) is equal to the bandwidth of the HE portion (Data), and the bandwidth of the HE portion (Data) is the bandwidth used for Data transmission in the RU, where the CM-HE-STF is equal to the bandwidth of the CM-HE-LTF and the HE-STF is equal to the bandwidth of the HE-LTF. Here, the bandwidth occupied by the channel measurement sequence is equal to or greater than the bandwidth of the data field, and the channel measurement sequence and the channel estimation sequence are separated in the time domain.

In other embodiments of the present invention, the channel measurement sequence portion (CM-HE-LTF) may be placed at the end of the data unit frame. Of course, there may be other situations where the channel measurement sequence portion (CM-HE-LTF) is located in the data unit frame, and the embodiment of the present invention is not particularly limited.

S803: the AP analyzes the single-user data unit frame to obtain a channel measurement sequence;

s804: the AP adopts CM-HE-LTF to measure the channel quality, obtains the SNR of each RU and quantizes the SNR;

Alternatively, referring to the dotted line in fig. 8, after S604, the method may further include:

s805: the AP adopts the CM-HE-LTF to measure the channel quality and obtain an expected bandwidth estimation channel H;

s806: the AP performs SVD on the channel H to obtain a beam forming matrix V, and quantizes the beam forming matrix V;

here, the AP quantizes the beamforming matrix to

S807: and the AP sends the quantized beamforming matrix V to the STA.

S808: and the STA carries out beam forming on the data unit through the beam forming matrix V.

Example five:

based on the fourth embodiment, in this embodiment, after the STA accesses the channel through contention, the STA transmits a multi-user data unit frame (UL MU PPDU) including a channel measurement sequence;

here, the RU of the STA is indicated by RU Allocation in HE-SIG-B of the preamble.

Here, still referring to fig. 9, the multi-user Data unit frame generated by the STA includes a preamble part, which may include L-STF, L-LTF, SIG, RL-SIG, HE-SIG-A, HE-SIG-B, CM-HE-STF, CM-HE-LTF, HE-STF, and HE-LTF, and a Data field (Data).

The bandwidth of the Pre-HE preamble portion (L-STF, L-LTF, SIG, RL-SIG, HE-SIG-a, and HE-SIG-B) is the entire bandwidth, the bandwidth of the channel measurement sequence portion (CM-HE-LTF) is the channel bandwidth to be measured indicated by the AP, the bandwidth of the channel estimation sequence portion (HE-STF and HE-LTF) is equal to the bandwidth of the HE portion (Data), and the bandwidth of the HE portion (Data) is the bandwidth used for Data transmission in the RU. Here, the bandwidth occupied by the channel measurement sequence is equal to or greater than the bandwidth of the data field, and the channel measurement sequence and the channel estimation sequence are separated in the time domain.

It should be noted that, in this embodiment, the interaction between the AP and the STA is the same as that in the fourth embodiment, and is not described herein again.

Example six:

based on the foregoing embodiments, in the present embodiment, the AP simultaneously performs data transmission with 2 STAs, such as STA1 and STA 2.

First, the AP schedules two STAs to transmit data unit frames through an Orthogonal Frequency Division Multiplexing (OFDM) by using a trigger frame, and allocates system bandwidth.

Then, the STA1 and the STA2 respectively receive the trigger frame, analyze signaling information such as RU allocation, power, synchronization and the like required by respective data transmission in the trigger frame, and particularly analyze the signaling information to a channel measurement domain in a signaling field to obtain respective channel bandwidth to be measured.

Thirdly, the STA1 and the STA2 generate the data unit frame shown in fig. 10 according to the respective channel bandwidths to be measured, and send the data unit frame to the AP;

here, the data unit frame transmitted by the STA is transmitted by OFDM multiple access, and the modulation method may be BPSK, QPSK, 16QAM, 64QAM, or the like.

Fourthly, after the AP receives the two data unit frames from STA1 and STA2, respectively, since the AP knows the format of the transmitted data frame for the trigger-based data unit, the AP performs symbol synchronization and coarse-granularity CFO estimation sequentially through L-STF, performs channel estimation and finer CFO estimation through L-LTF, estimates signaling analysis of the pre-HE part, obtains SNR from STA1 to AP and SNR from STA 2to AP through CM-HE-LTF in the two data unit frames, respectively, and the AP may re-allocate RU resource blocks to STA1 and STA2 according to the SNR.

Or the AP may obtain an expected bandwidth estimation channel from the STA1 to the AP and an expected bandwidth estimation channel from the STA 2to the AP through the CM-HE-LTF, and then obtain a beamforming matrix by separately estimating channel metrics SVD through the two expected bandwidths, and send the beamforming matrix to the STA1 and the STA2 for beamforming.

Example seven:

based on the same inventive concept, the present embodiment provides a wireless communication apparatus, which is consistent with the first wireless communication apparatus and the AP described in the first embodiment.

Then, referring to fig. 11, the apparatus 110 includes: a first receiving unit 111, configured to receive a data unit frame sent by a second wireless communication apparatus, where the data unit frame at least includes a channel measurement sequence and a data field; an analyzing unit 112, configured to analyze the channel measurement data unit frame to obtain a channel measurement sequence; a measurement unit 113, configured to perform channel measurement based on the channel measurement sequence.

In other embodiments of the present invention, the apparatus further comprises: a first sending unit, configured to send a trigger frame to the second wireless communication apparatus before the first receiving unit receives the data unit frame, where the trigger frame includes at least first indication information indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field, and the bandwidth of the channel measurement sequence is greater than or equal to the bandwidth of the data field.

In other embodiments of the present invention, the apparatus further comprises: and the determining unit is used for determining the bandwidth granularity of the channel measurement sequence according to the resource unit RU allocation or the sub-band bandwidth allocation before the first sending unit sends the trigger frame.

In other embodiments of the present invention, the first sending unit is further configured to send a trigger frame to the third wireless communication apparatus, where the trigger frame further includes second indication information indicating a bandwidth of a channel measurement sequence of the third wireless communication apparatus and a bandwidth of a data field, and the bandwidth of the channel measurement sequence of the third wireless communication apparatus is greater than or equal to the bandwidth of the data field of the third wireless communication apparatus.

In other embodiments of the present invention, the trigger frame further includes third indication information for indicating the number of measurement layers or the number of streams of the channel measurement sequence; correspondingly, the data unit frame received by the first receiving unit also comprises third indication information; the analysis unit is also used for analyzing the data unit frame to obtain a channel measurement sequence and third indication information; and the measuring unit is also used for carrying out channel measurement based on the third indication information and the channel measurement sequence.

In other embodiments of the present invention, the measuring unit is specifically configured to perform channel quality measurement by using the channel measurement sequence, and obtain the channel quality of the channel with the second wireless communication apparatus, where the channel quality is used for RU allocation to the second wireless communication apparatus.

In other embodiments of the present invention, the apparatus further comprises: an obtaining unit and a second sending unit; the measurement unit is specifically used for performing channel measurement by adopting a channel measurement sequence to obtain an expected bandwidth estimation channel; an obtaining unit, configured to estimate a channel according to a desired bandwidth, and obtain a beamforming matrix; and the second sending unit is used for sending the beam forming matrix to the second wireless communication device, and the beam forming matrix is used for indicating the second wireless communication device to carry out beam forming.

In other embodiments of the present invention, the apparatus further comprises: and the estimation unit is used for adopting the channel estimation sequence in the data unit frame to carry out channel estimation so as to detect the data field.

Here, it should be noted that: the descriptions of the embodiments of the apparatus are similar to the descriptions of the methods, and have the same advantages as the embodiments of the methods, and therefore are not repeated herein. For technical details that are not disclosed in the embodiments of the apparatus of the present invention, those skilled in the art should refer to the description of the embodiments of the method of the present invention to understand, and for brevity, will not be described again here.

Example eight:

based on the same inventive concept, the present embodiment provides a wireless communication apparatus, which is consistent with the second wireless communication apparatus and the STA described in the first embodiment.

Then, referring to fig. 12, the apparatus 120 includes: a second obtaining unit 121, configured to obtain first indication information indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field; a generating unit 122, configured to generate a data unit frame according to the indication information, where the data unit frame at least includes a channel measurement sequence and a data field; a third transmitting unit 123, configured to transmit the data unit frame to the first wireless communication device.

In other embodiments of the present invention, the second obtaining unit is specifically configured to receive a trigger frame from the first wireless communication apparatus, where the trigger frame includes at least first indication information indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field, and the bandwidth of the channel measurement sequence is greater than or equal to the bandwidth of the data field.

In other embodiments of the present invention, the trigger frame further includes third indication information for indicating the number of measurement layers or the number of streams of the channel measurement sequence; correspondingly, the data unit frame further includes third indication information, and the third indication information is used for indicating the first wireless communication device to perform channel measurement based on the second indication information and the channel measurement sequence.

In other embodiments of the present invention, the apparatus further comprises: an access unit, configured to access a channel through random contention; correspondingly, the second obtaining unit is specifically configured to obtain the indication information according to the bandwidth of the channel.

In other embodiments of the present invention, the third sending unit is specifically configured to send the channel measurement sequence in an omni-directional manner.

Example nine:

based on the same inventive concept, the present embodiment provides an AP, as shown in fig. 13, the AP130 includes: a first receiver 131, configured to receive a data unit frame sent by a station STA, where the data unit frame at least includes a channel measurement sequence and a data field; a first processor 132, configured to parse the channel measurement data unit frame to obtain a channel measurement sequence; channel measurements are made based on the channel measurement sequence.

In other embodiments of the present invention, the AP further includes: a first transmitter for transmitting a trigger frame to the second wireless communication apparatus before the first receiver receives the data unit frame, the trigger frame including at least first indication information indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field, the bandwidth of the channel measurement sequence being greater than or equal to the bandwidth of the data field.

In other embodiments of the present invention, the first processor is further configured to determine the bandwidth granularity of the channel measurement sequence according to the resource unit RU allocation or the subband bandwidth allocation before the first transmitter transmits the trigger frame.

In other embodiments of the present invention, the first transmitter is configured to transmit a trigger frame to a third wireless communication apparatus, the trigger frame further includes second indication information indicating a bandwidth of a channel measurement sequence of the third wireless communication apparatus and a bandwidth of a data field, and the bandwidth of the channel measurement sequence of the third wireless communication apparatus is greater than or equal to the bandwidth of the data field of the third wireless communication apparatus.

In other embodiments of the present invention, the first processor is specifically configured to perform channel quality measurement using the channel measurement sequence, and obtain channel quality of a channel with the second wireless communication apparatus, where the channel quality is used for RU allocation to the second wireless communication apparatus.

In other embodiments of the present invention, the first processor is specifically configured to perform channel measurement by using a channel measurement sequence to obtain an expected bandwidth estimation channel; estimating a channel according to the expected bandwidth to obtain a beam forming matrix; accordingly, the AP further comprises: and the third transmitter is used for transmitting the beam forming matrix to the second wireless communication device, and the beam forming matrix is used for indicating the second wireless communication device to carry out beam forming.

In other embodiments of the present invention, the first processor is specifically configured to perform channel estimation using a channel estimation sequence in a data unit frame to detect the data field.

In practical applications, the first Processor may be at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a Central Processing Unit (CPU), a controller, a microcontroller, and a microprocessor; the first transmitter, the third transmitter, and the first receiver may be Radio Frequency Identification (RFID) antennas. It is to be understood that, for different communication systems, the electronic device for implementing the functions of the first processor, the first receiver, and the first transmitter may also be other devices, and the embodiments of the present invention are not limited in particular.

Further, the first transmitter, the third transmitter and the first receiver may be physically separated or combined, and the embodiment of the present invention is not particularly limited. Here, it should be noted that: the description of the above device embodiment is similar to the description of the above method, and has the same beneficial effects as the method embodiment, and therefore, the description thereof is omitted. For technical details that are not disclosed in the embodiment of the apparatus of the present invention, those skilled in the art should refer to the description of the embodiment of the method of the present invention to understand that, for the sake of brevity, detailed description is omitted here.

Example ten:

based on the same inventive concept, the present embodiment provides an STA, as shown in fig. 14, the STA140 includes: a second processor 141 for obtaining first indication information indicating a bandwidth of the channel measurement sequence and a bandwidth of the data field; generating a data unit frame according to the indication information, wherein the data unit frame at least comprises a channel measurement sequence and a data field; a second transmitter 142 for transmitting the data unit frame to the first wireless communication device.

In other embodiments of the present invention, the STA includes: and a second receiver for receiving a trigger frame from the first wireless communication device and forwarding the trigger frame to the second processor, wherein the trigger frame at least comprises first indication information for indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field, and the bandwidth of the channel measurement sequence is greater than or equal to the bandwidth of the data field.

In other embodiments of the present invention, the second processor is further configured to access a channel through random contention; and obtaining the indication information according to the bandwidth of the channel.

In other embodiments of the present invention, the second transmitter is specifically configured to transmit the channel measurement sequence in an omni-directional manner.

In practical applications, the second processor may be at least one of an ASIC, a DSP, a DSPD, a PLD, an FPGA, a CPU, a controller, a microcontroller, and a microprocessor; the second transmitter and the second receiver may be RFID antennas. It is to be understood that, for different communication systems, the electronic device for implementing the functions of the second processor, the second receiver, and the second transmitter may also be other devices, and the embodiments of the present invention are not particularly limited.

Further, the second transmitter and the second receiver may be physically separated or combined, and the embodiment of the present invention is not particularly limited.

Here, it should be noted that: the description of the above device embodiment is similar to the description of the above method, and has the same beneficial effects as the method embodiment, and therefore, the description thereof is omitted. For technical details that are not disclosed in the embodiment of the apparatus of the present invention, those skilled in the art should refer to the description of the embodiment of the method of the present invention to understand that, for the sake of brevity, detailed description is omitted here.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A method of channel measurement applied to a first wireless communication device, the method comprising:

receiving a data unit frame sent by a second wireless communication device, wherein the data unit frame at least comprises a channel measurement sequence and a data field;

analyzing the data unit frame to obtain the channel measurement sequence;

performing channel measurement based on the channel measurement sequence;

prior to the receiving the data unit frame transmitted by the second wireless communication device, the method further comprises:

transmitting a trigger frame to the second wireless communication apparatus, the trigger frame including at least first indication information indicating a bandwidth of the channel measurement sequence and a bandwidth of the data field, the bandwidth of the channel measurement sequence being greater than or equal to the bandwidth of the data field.

2. The method of claim 1, wherein prior to said sending a trigger frame to the second wireless communication device, the method further comprises:

and determining the bandwidth granularity of the channel measurement sequence according to the RU allocation or the sub-band bandwidth allocation of the resource units.

3. The method of claim 1, wherein the trigger frame further comprises second indication information indicating a bandwidth of a channel measurement sequence of a third wireless communication apparatus and a bandwidth of a data field, wherein the bandwidth of the channel measurement sequence of the third wireless communication apparatus is greater than or equal to the bandwidth of the data field of the third wireless communication apparatus;

accordingly, the method further comprises: transmitting the trigger frame to the third wireless communication device.

4. The method of claim 1, wherein the trigger frame further comprises third indication information for indicating a number of measurement layers or a number of streams of the channel measurement sequence;

correspondingly, the third indication information is also included in the data unit frame; the method further comprises the following steps: analyzing the data unit frame to obtain the channel measurement sequence and the third indication information; and performing channel measurement based on the third indication information and the channel measurement sequence.

5. The method of claim 1, wherein the performing channel measurements based on the channel measurement sequence comprises:

and measuring the channel quality by adopting the channel measurement sequence to obtain the channel quality of a channel accessed by the second wireless communication device, wherein the channel quality is used for RU allocation of the second wireless communication device.

6. The method of claim 1, wherein the performing channel measurements based on the channel measurement sequence comprises: adopting the channel measurement sequence to carry out channel measurement to obtain an expected bandwidth estimation channel;

correspondingly, the method further comprises:

estimating a channel according to the expected bandwidth to obtain a beam forming matrix;

and sending the beam forming matrix to the second wireless communication device, wherein the beam forming matrix is used for indicating the second wireless communication device to carry out beam forming.

7. The method of claim 1, wherein the data unit frame further comprises a channel estimation sequence; the method further comprises the following steps:

and performing channel estimation by adopting the channel estimation sequence to detect the data field.

8. The method of claim 7, wherein the channel estimation sequence is a portion of the channel measurement sequence corresponding to the data field; or the like, or, alternatively,

the channel estimation sequence is a field adjacent to the channel measurement sequence in a time domain, and the bandwidth of the channel estimation sequence is the same as that of the data field.

9. A method of channel measurement applied to a second wireless communication device, the method comprising:

obtaining first indication information for indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field;

generating a data unit frame according to the first indication information, wherein the data unit frame at least comprises the channel measurement sequence and the data field;

transmitting the data unit frame to a first wireless communication device;

the obtaining of the first indication information indicating a bandwidth of the channel measurement sequence and a bandwidth of the data field includes:

receiving a trigger frame from a first wireless communication device, the trigger frame including at least first indication information indicating a bandwidth of the channel measurement sequence and a bandwidth of the data field, the bandwidth of the channel measurement sequence being greater than or equal to the bandwidth of the data field.

10. The method of claim 9, wherein the trigger frame further comprises third indication information for indicating a number of measurement layers or a number of streams of the channel measurement sequence;

correspondingly, the third indication information is further included in the data unit frame, and the third indication information is used for instructing the first wireless communication device to perform channel measurement based on the third indication information and the channel measurement sequence.

11. The method as claimed in claim 9, wherein the obtaining the first indication information indicating the bandwidth of the channel measurement sequence and the bandwidth of the data field comprises:

accessing a channel through random contention;

and acquiring the first indication information according to the bandwidth of the channel and a preset bandwidth allocation rule.

12. The method of any of claims 9 to 11, wherein said transmitting the data unit frame to the first wireless communication device comprises:

and transmitting the channel measurement sequence in an omnidirectional mode.

13. A wireless communications apparatus, comprising:

a first receiving unit, configured to receive a data unit frame sent by a second wireless communication apparatus, where the data unit frame at least includes a channel measurement sequence and a data field;

the analyzing unit is used for analyzing the channel measurement data unit frame to obtain the channel measurement sequence;

a measuring unit, configured to perform channel measurement based on the channel measurement sequence;

the device further comprises: a first sending unit, configured to send a trigger frame to the second wireless communication apparatus before the first receiving unit receives the data unit frame, where the trigger frame includes at least first indication information indicating a bandwidth of the channel measurement sequence and a bandwidth of the data field, and the bandwidth of the channel measurement sequence is greater than or equal to the bandwidth of the data field.

14. The apparatus of claim 13, further comprising: a determining unit, configured to determine, before the first sending unit sends the trigger frame, a bandwidth granularity of the channel measurement sequence according to resource unit RU allocation or subband bandwidth allocation.

15. The apparatus of claim 13, wherein the first sending unit is further configured to send the trigger frame to a third wireless communication apparatus, and the trigger frame further includes second indication information indicating a bandwidth of a channel measurement sequence of the third wireless communication apparatus and a bandwidth of a data field, and the bandwidth of the channel measurement sequence of the third wireless communication apparatus is greater than or equal to the bandwidth of the data field of the third wireless communication apparatus.

16. The apparatus of claim 13, wherein the trigger frame further comprises a third indication information for indicating a number of measurement layers or a number of streams of the channel measurement sequence;

correspondingly, the data unit frame received by the first receiving unit further includes the third indication information; the parsing unit is further configured to parse the data unit frame to obtain the channel measurement sequence and the third indication information; the measurement unit is further configured to perform channel measurement based on the third indication information and the channel measurement sequence.

17. The apparatus of claim 13, wherein the measurement unit is specifically configured to perform channel quality measurement by using the channel measurement sequence, and obtain channel quality of a channel accessed by the second wireless communication apparatus, where the channel quality is used for RU re-allocation to the second wireless communication apparatus.

18. The apparatus of claim 13, further comprising: an obtaining unit and a second sending unit;

the measurement unit is specifically configured to perform channel measurement by using the channel measurement sequence to obtain an expected bandwidth estimation channel;

the obtaining unit is configured to obtain a beamforming matrix according to the desired bandwidth estimation channel;

the second sending unit is configured to send the beamforming matrix to the second wireless communication apparatus, where the beamforming matrix is used to instruct the second wireless communication apparatus to perform beamforming.

19. The apparatus of claim 13, further comprising: and the estimation unit is used for adopting the channel estimation sequence in the data unit frame to carry out channel estimation so as to detect the data field.

20. A wireless communications apparatus, comprising:

a second obtaining unit, configured to obtain first indication information indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field;

a generating unit, configured to generate a data unit frame according to the first indication information, where the data unit frame at least includes the channel measurement sequence and the data field;

a third transmitting unit for transmitting the data unit frame to the first wireless communication apparatus;

the second obtaining unit is specifically configured to receive a trigger frame from a first wireless communication apparatus, where the trigger frame includes at least first indication information indicating a bandwidth of the channel measurement sequence and a bandwidth of the data field, and the bandwidth of the channel measurement sequence is greater than or equal to the bandwidth of the data field.

21. The apparatus of claim 20, wherein the trigger frame further comprises a third indication information for indicating a number of measurement layers or a number of streams of the channel measurement sequence; correspondingly, the third indication information is further included in the data unit frame, and the third indication information is used for instructing the first wireless communication device to perform channel measurement based on the third indication information and the channel measurement sequence.

22. The apparatus of claim 20, further comprising: an access unit, configured to access a channel through random contention; correspondingly, the second obtaining unit is specifically configured to obtain the first indication information according to the bandwidth of the channel and a preset bandwidth allocation rule.

23. The apparatus according to any of the claims 20 to 22, wherein the third transmitting unit is specifically configured to transmit the channel measurement sequence in an omni-directional manner.

24. A wireless Access Point (AP), comprising:

a first receiver, configured to receive a data unit frame sent by a station STA, where the data unit frame at least includes a channel measurement sequence and a data field;

the first processor is used for analyzing the channel measurement data unit frame to obtain the channel measurement sequence; performing channel measurement based on the channel measurement sequence;

the AP further comprises: a first transmitter, configured to transmit a trigger frame to a second wireless communication apparatus before the first receiver receives the data unit frame, where the trigger frame includes at least first indication information indicating a bandwidth of the channel measurement sequence and a bandwidth of the data field, and the bandwidth of the channel measurement sequence is greater than or equal to the bandwidth of the data field.

25. The AP of claim 24, wherein the first transmitter is further configured to transmit the trigger frame to a third wireless communication device, wherein the trigger frame further includes second indication information indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field of the third wireless communication device, and wherein the bandwidth of the channel measurement sequence of the third wireless communication device is greater than or equal to the bandwidth of the data field of the third wireless communication device.

26. A Station (STA), comprising:

a second processor for obtaining first indication information indicating a bandwidth of a channel measurement sequence and a bandwidth of a data field; generating a data unit frame according to the first indication information, wherein the data unit frame at least comprises the channel measurement sequence and the data field;

a second transmitter for transmitting the data unit frame to a first wireless communication device;

a second receiver, configured to receive a trigger frame from a first wireless communication device and forward the trigger frame to the second processor, where the trigger frame includes at least first indication information indicating a bandwidth of the channel measurement sequence and a bandwidth of the data field, and the bandwidth of the channel measurement sequence is greater than or equal to the bandwidth of the data field.