CN103001680B - Method and device for transmitting weight - Google Patents

Abstract

Embodiments of the present invention provide a weight transmission method and device, the method comprising: receiving a channel test signal sent by a beamforming sender; testing the channel to obtain a corresponding weight; determining the effective duration corresponding to the weight ; Store the weight in the very high throughput rate VHT compressed beamforming report element; within the effective duration of the weight, send the VHT compressed VHT containing the VHT compressed beamforming report element to the beamforming sender Beamforming frames. In the embodiment of the present invention, the beamforming receiver obtains the corresponding weight after testing the channel, and sets the duration of the corresponding weight, and after judging the validity of the duration of the weight, sends to the beamforming The weight value is fed back by the beamforming sender, which solves the information expiration phenomenon of the weight value collected by the beamforming sender and improves the quality of subsequent communication.

Description

A weight transmission method and device

technical field

The present invention relates to the field of communication technology, in particular to a weight transmission method and device.

Background technique

With the development of communication technologies, in order to improve communication quality in wireless local area networks, there is a channel detection (Sounding) mechanism between a beamforming initiator (Beamformer) station and a beamforming receiver (Beamformee) station. The Sounding mechanism specifically includes:

First, the Beamformer station sends a Null Data Packet Announcement (NDPA, Null Data Packet Announcement) frame to one or more Beamformee stations, and the notification corresponds to the associated address (AID, Association identifier, also known as the association identifier) carried in the announcement frame. The matched Beamformee station prepares to carry out channel detection, and indicates the content of its feedback weight value, then, described Beamformer sends the empty data packet (NDP, Null Data Packet) frame that does not contain data, provides the test parameter of channel for Beamformee. Described Beamformee station carries out test after receiving NDP frame, calculates weight value according to the result of test, and saves the calculated weight value in Very High Throughput Rate (VHT, Very High Throughput) compressed beamforming report. After the SIFS period after the NDP is sent, the first Beamformee that performs channel detection in the single Beamformee or empty data packet announcement NDPA frame sends to the Beamformer a VHTCompressed Beamforming frame that includes the VHT Compressed Beamforming report element; afterward, the Beamformer Send beamforming response request frames (Beamforming ReportPoll) to other Beamformees in the NDPA frame in turn. However, since the other Beamformees in the NDPA frame have not received the NDPA frame or NDP frame, channel testing cannot be performed, and the latest Calculate the weight, if the Beamformee has a compressed beamforming report (the weight in this report is not up-to-date), then normally send the VHT Compressed Beamforming frame containing the elements of the VHT compressed beamforming report, if the Beaformee does not have a compressed beam Forming report, or there is no weight in the report, send a VHT Compressed Beamforming frame that does not contain the compressed beamforming report element.

During the research and practice of the existing technology, the inventor of the present invention found that in the existing implementation, the compressed beamforming report saved by Berformee has been invalid due to various possibilities, and if the saved report is sent without identification If the compressed beamforming report is not used, the feedback weight collected by Beamformer may expire, thereby affecting the subsequent communication quality.

Contents of the invention

Embodiments of the present invention provide a weight transmission method and device to solve the technical problem in the prior art that the received weight expires, so as to improve communication quality.

In order to solve the above technical problems, an embodiment of the present invention provides a weight transmission method, the method comprising:

Receive the channel test signal sent by the beamforming sender;

Test the channel to get the corresponding weight;

Determine the effective duration corresponding to the weight;

storing said weights in a very high throughput VHT compressed beamforming report element;

Sending the VHT compressed beamforming report element to the beamforming sender within the valid time period of the weight.

Correspondingly, the embodiment of the present invention also provides a weight transmission device, the device includes:

The first receiving unit is configured to receive the channel test signal sent by the beamforming sender;

A test unit is used to test the channel to obtain the corresponding weight;

A determining unit, configured to determine the effective duration corresponding to the weight;

A storage unit, configured to store the weights in the very high throughput VHT compressed beamforming report element;

The first transmission unit is configured to send the VHT compressed beamforming report element to the beamforming sender within the valid time period of the weight.

Description of drawings

FIG. 1 is a flow chart of a weight transmission method provided by an embodiment of the present invention;

FIG. 2 is a flow chart of another weight transmission method provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of a frame structure of an NDPA frame provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a weight transmission device provided by an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

Please refer to FIG. 1, which is a flow chart of a weight transmission method provided by an embodiment of the present invention; the method includes steps;

Step 101: receiving a channel test signal sent by a beamforming sender (Beamformer);

In this step, all beamforming receivers (Beamformee), a single beamforming receiver or a station (STA, Station) may receive the channel test signal sent by the beamforming sender. Wherein, the channel test signal may be a null data packet (NDP, Null Data Packet) frame, and its purpose is to provide channel test parameters for the beamforming receiver. But it is not limited thereto, and there may also be other empty frames that do not include data, which is not limited in this embodiment.

Step 102: Test the channel to obtain the corresponding weight;

Wherein, the test performed on the channel is, for example, performed on the channel by means of channel estimation. That is to say, after receiving the channel test signal, the beamforming receiver uses the channel estimation method to test its own channel, and obtains the weight according to the test result.

Step 103: Determine the valid duration corresponding to the weight;

In this embodiment, the effective duration corresponding to the weight is determined by the following five embodiments:

The first is: 1) determine the moving speed of the beamforming receiver itself;

2) Classify according to the size of the moving speed to obtain grades of different speeds; for example, divide into three grades of high, middle and low, but it is not limited thereto.

3) Set the corresponding effective duration for each speed, and the effective duration can be controlled by a counter, or realized by other similar counting components; the higher the grade, the shorter the set effective duration.

4) While saving the weight value in the very high throughput (VHT, Very High Throughput) compressed beamforming report element, start the counter to count down.

In this step, the counting of the counter is decremented as an example. Of course, the counting of the counter may be set as an incrementing example, which is not limited in this embodiment. For example, each speed grade corresponds to an effective duration, and the effective duration unit can be us, for example, the duration of low, medium and high speed gears is set to T1, T2, T3. T1>T2>T3, the counter is started while saving the weight value in the VHT compressed beamforming report element, and the counter counts down.

The second is: 1) calculate the Doppler frequency shift according to the moving speed of the beamforming receiver;

2) Calculate the effective duration of weights according to the Doppler frequency shift and channel similarity.

The third is: before receiving the channel test signal notification sent by the beamforming initiator, if receiving the media access control frame sent by the beamforming initiator, the media access control frame includes the indicator weight setting First valid duration information: when determining the valid duration corresponding to the weight, the valid duration corresponding to the weight may be determined according to the first valid duration information indicating weight setting in the medium access control frame.

The fourth type is: before receiving the channel test signal announcement sent by the beamforming initiator, if the beacon frame sent by the beamforming initiator is received, the beacon frame includes the second effective duration information indicating the weight setting; The second valid duration information may be the same as the first valid duration information, or different; then when determining the valid duration corresponding to the weight, it may be set according to the second valid duration indicated in the beacon frame. The duration information determines the effective duration corresponding to the weight.

Fifth, when the channel test signal announcement includes third valid duration information indicating weight setting, wherein the third valid duration information may be the same as the first valid duration or the second valid duration, or may be can be different,

The determining the valid duration corresponding to the weight specifically includes: determining the valid duration corresponding to the weight according to the third valid duration information set according to the indicated weight.

However, the specific determination of the effective time period corresponding to the weight value is not limited to the above five methods, and may be other methods, which are not limited in this embodiment.

Step 104: saving the weight in the very high throughput VHT compressed beamforming report element;

Step 105: Send the VHT compression beamforming report element to the beamforming sender within the valid time period of the weight (ie, the valid time of the weight). For example, the VHT compressed beamforming report element may be sent to the beamforming sender through a VHT compressed beamforming frame, but it is not limited thereto, and may also be sent through other frames.

Wherein, in this embodiment, the beamformer feeds back the weight value to the beamforming initiator, so that the beamforming initiator weights the transmission signal, so as to improve the receiving situation of the beamforming receiver.

Preferably, in this embodiment, before sending the VHT compressed beamforming report element to the beamforming sender, the method may further include: receiving a beamforming response request frame sent by the beamforming sender; afterward, Send the VHT compressed beamforming report element to the beamforming sender within the effective duration of the weight, specifically, send the VHT compressed beamforming report to the beamforming sender through a VHT compressed beamforming frame element.

Preferably, the method may further include: judging whether it is the first beamforming recipient specified in the channel test signal announcement, and if so, performing sending to the beamforming within the effective duration of the weight the step of sending the VHT compressed beamforming report element; otherwise, execute the receiving beamforming response request frame sent by the beamforming sender; within the effective duration of the weight, send the beamforming sender the Describe the steps for VHT Compression Beamforming report elements.

That is to say, in this step, if the beamforming receiver determines that it is the first beamforming receiver specified in the channel test signal announcement, within the effective time of the weight value, send or sending a VHT Compressed Beamforming frame including said VHT Compressed Beamforming Report element; or

If the beamforming receiver determines that it is not the first beamforming receiver specified in the channel test signal announcement, after receiving the beamforming response request frame sent by the beamforming sender, if the weight is valid Next, send the VHT compressed beamforming frame including the VHT compressed beamforming report element to the beamforming sender.

In the embodiment of the present invention, the beamforming receiver obtains the corresponding weight value after testing the channel, and sets the effective duration of the corresponding weight value, and after judging that the weight value is valid, sends the beamforming signal to the beamforming sender Feedback of the weight solves the outdated phenomenon of the weight information collected by the beamforming sender, saves the cost of occupying channel resources, and improves the quality of subsequent communication.

Please also refer to FIG. 2, which is a flow chart of another weight transmission method provided by an embodiment of the present invention. The method includes:

Step 201: Receive the channel test signal notification sent by the beamforming initiator;

In this step, the announcement of the channel test signal may be a Null Data Packet Announcement (NDPA, Null Data Packet Announcement) frame, but it is not limited thereto. The schematic diagram of the frame structure of the NDPA frame is as shown in Figure 3, and in Figure 3, the NDPA frame includes the following fields: frame control, duration, receiver address (RA, Receiver address), sender address (TA, Transmitter address), sounding sequence (Sounding), stations STA Info1 to STA InfoN, and frame check sequence (FCS, FrameCheck Sequence), etc., wherein, the sounding sequence includes: reserved fields and sequence numbers; the station STA1 Info1 includes : Association identifier (AID, Association identifier, that is, association address), feedback type and NC Index, as shown in Figure 3. Similarly, in the STA InfoN, each station can include AID, feedback type and NC Index, which are not shown in the figure.

Among Fig. 3, if described receiver address RA is unicast address then instructs Beamformer to carry out channel detection to single Beamformee, n=1 in this moment STA Info n;

If the receiver address RA is a multicast address, the Beamformer is instructed to perform channel detection on multiple Beamformees, and n>1 in STAInfo n at this time;

The beamforming receiver can also determine whether it is the first beamforming receiver or not the first beamforming receiver according to the address of the receiving end.

The Sounding sequence is used to indicate the order of the NDPA frame, and is used to indicate the number of NDPA frame batches corresponding to the VHT compression beamforming report fed back by Beamformee;

The STA info is used to indicate those STAs (AID is the serial number of the corresponding STA) to prepare to listen to the NDP frame for channel detection;

The AID field represents the associated address AID assigned by the Beamformer to the Beamformee.

The Feedback Type field represents the feedback type, and is mainly used to distinguish SU-MIMO (Feedback Type=0) scenarios and MU-MIMO (Feedback Type=1) scenarios.

The NC Index field is set to 0 in the SU-MIMO scenario, and is set to the corresponding feedback dimension in the MU-MIMO scenario.

Step 202: Determine whether you are the beamforming receiver to be tested according to the channel test signal announcement, if yes, execute step 203; otherwise, execute step 208, and end the process;

In this step, if the receiving beamforming receiver matches the associated address AID notified by the channel test signal, it means that the receiving beamforming receiver is the beamforming receiver to be tested, and then the beamforming receiver to be tested The receiver enters the test state and waits for the channel test signal (such as NDP frame, etc.) sent by the beamforming sender.

Step 203: Receive the channel test signal sent by the beamforming sender;

The channel test signal may be an NDP frame, but is not limited thereto.

Step 204: Test the channel to obtain the corresponding weight;

Step 205: Determine the effective duration corresponding to the weight;

For the specific process of determining the effective duration corresponding to the weight, refer to the corresponding description above.

Step 206: saving the weight in the VHT compressed beamforming report element;

Step 207: Send the VHT compressed beamforming frame including the VHT compressed beamforming report element to the beamforming sender within the valid time period of the weight.

In this step, the VHT compressed beamforming report element may be sent to the beamforming sender through a VHT compressed beamforming frame, but it is not limited thereto.

In this embodiment, details of steps 203 to 207 can be found above.

On the basis of the above embodiments, before sending the VHT compressed beamforming frame containing the VHT compressed beamforming report element to the beamforming sender within the effective time of the weight, the method may further include :

Judging whether the weight value is valid, if the weight value is valid, then perform the step of sending the VHT compressed beamforming report element to the beamforming sender within the valid time of the weight value; otherwise, within the effective time of the weight value During the effective time, the VHT compressed beamforming report element is not sent to the beamforming sender, for example, the VHT compressed beamforming frame that does not include the VHT compressed beamforming report element is sent to the beamforming sender.

Further, the method may further include: after judging that the weight is invalid, clearing the weight in the compressed beamforming report element.

Wherein, the process of judging whether the weight is valid or not is illustrated by taking two cases as examples in this embodiment, but it is not limited thereto:

One is to judge whether the count of the counter has returned to zero, if the count of the counter has not returned to zero, it is determined that the effective duration is valid; otherwise, it is judged that the effective duration is invalid;

The other is: if the effective duration of the weight calculation is set to time T after the feedback weight moment, compare the effective duration of the weight with the set time T, if the time T is less than or equal to the weight If the effective duration of the weight is valid, it is determined that the effective duration of the weight is valid; otherwise, it is determined that the effective duration of the weight is invalid.

In yet another embodiment, the beamforming receiver receives the media access control MAC frame sent by the beamforming initiator, and the media access control MAC frame includes the first effective duration information indicating weight setting; specifically, Receive the media access control frame sent by the beamforming initiator through unicast, broadcast or multicast; wherein, any field in the MAC frame may include the first effective duration information indicating weight setting, for example, the Existing fields, reserved fields, or extended fields in the above-mentioned MAC frame.

Afterwards, after receiving the channel test signal sent by the beamforming sender, the beamforming receiver tests the channel to obtain the corresponding weight;

Afterwards, the beamforming receiver determines the valid duration corresponding to the weight according to the first valid duration information indicating the weight setting in the MAC frame.

storing the weight in a VHT compressed beamforming report element, and sending a VHT compressed beamforming frame including the VHT compressed beamforming report element to the beamforming sender within the effective duration of the weight.

Preferably, in this example, the MAC frame may include: a broadcast MAC frame, a multicast MAC frame or a unicast MAC frame. Wherein, the broadcast MAC frame may be a beacon frame, the multicast MAC frame may be an NDPA frame; the unicast MAC frame may be an association request frame or an association response frame. But it is not limited to this.

In another embodiment, the beamforming receiver receives the channel test signal announcement sent by the beamforming initiator; confirms whether it is the beamforming receiver to be tested according to the channel test signal announcement, and confirms that it is the beamforming receiver to be tested. Enter the channel test state when the beamforming receiver under test; and

After receiving the channel test signal sent by the beamforming sender; the channel is tested to obtain the corresponding weight value, wherein the channel test signal notification includes the second valid duration information indicating the weight value setting, and the second valid The duration information is the same as or different from the first effective duration. Specifically, the receiver address RA field notified by the channel test signal may include the second effective duration information indicating weight setting, but it is not limited thereto.

The beamforming receiver determines the effective duration corresponding to the weight according to the second effective duration information set by the indicated weight, saves the weight in the VHT compressed beamforming report element, and Within the valid duration of , send the VHT compressed beamforming frame including the VHT compressed beamforming report element to the beamforming sender.

Preferably, in this embodiment, the beamforming receiver receives the channel test signal announcement sent by the beamforming initiator through multicast.

In the embodiment of the present invention, the validity of the stored feedback weight value is determined by setting the valid time counter and the valid time comparison mechanism, and then decides the content contained in the VHT Compressed Beamforming frame sent by it (that is, whether it includes the stored weight value or not). VHT compressed beamforming report elements), which can prevent the information collected by Beamformer from being out of date.

Based on the implementation process of the above method, the embodiment of the present invention also provides a weight transmission device. Unit 44 and the first transmission unit 45, wherein,

The first receiving unit 41 is configured to receive a channel test signal sent by a beamforming sender; wherein, the channel test signal may be an NDP frame, and its purpose is to provide a receiver with channel test parameters. But it is not limited thereto, and there may also be other empty frames that do not include data, which is not limited in this embodiment.

The testing unit 42 is configured to test a channel to obtain a corresponding weight;

Wherein, the test performed on the channel is, for example, performed on the channel by means of channel estimation. That is to say, after receiving the channel test signal, the beamforming receiver uses the channel estimation method to test its own channel, and obtains the weight according to the test result.

The determination unit 43 is used to determine the effective duration corresponding to the weight; one is: 1) determine the moving speed of the beamforming receiver itself; 2) classify according to the size of the moving speed, and obtain different files Speed; for example, it is divided into three gears, high, medium and low, but it is not obvious. 3) Set a corresponding duration for each gear speed, and the duration is controlled by a counter; that is to say, the higher the gear speed, the shorter the set duration. 4) While saving the weights in the compressed beamforming report, start the counter to count down. The other is: 1) calculating the Doppler frequency shift according to the moving speed of the beamforming receiver; 2) calculating the duration of the weight value according to the Doppler frequency shift and channel similarity. However, the specific determination of the duration corresponding to the weight is not limited to the above two methods, and may be other methods, such as the other three of the above five determination methods.

The storage unit 44 is configured to store the weight in the very high throughput VHT compressed beamforming report element;

The first transmission unit 45 is configured to send the VHT compressed beamforming report element to the beamforming sender within the effective duration of the weight, specifically, the VHT compressed beamforming frame may be used to send the beamforming report element to the beamforming sender. The sender sends the VHT compression beamforming report element.

Preferably, the device may further include: a second receiving unit and a first judging unit, wherein the second receiving unit is configured to receive the beam before the first receiving unit receives the channel test signal The channel test signal announcement sent by the shaping initiator; the first judging unit is configured to confirm whether it is the beamforming receiver to be tested according to the channel test signal announcement, and when confirming that it is the beamforming receiver to be tested, The first receiving unit is started to receive the channel test signal sent by the beamforming sender.

Preferably, the device may further include: a third receiving unit, connected to the first transmission unit, for receiving the beamforming response request frame sent by the beamforming sender;

The second transmission unit is further configured to, after the third receiving unit receives the beamforming response request frame sent by the beamforming sender, within the valid duration of the weight, send The VHT compression beamforming report element.

Preferably, the device may further include: a second judging unit, configured to judge whether it is the first beamforming receiver specified in the channel test signal announcement, and send a yes judging result to the first transmission unit; Send a negative judgment result to the second transmission unit.

Preferably, the determination unit includes: a speed determination unit, a grading unit, a duration setting unit, and a counting start unit, wherein the speed determination unit is used to determine the moving speed of the beamforming receiver itself; the grading unit , for classifying according to the size of the moving speed to obtain speeds of different files; the time length setting unit is used for setting a corresponding effective time length for each speed, and the time length is controlled by a counter; The counting starting unit is used for starting the counter to count down when the storage unit saves the weight in the VHT compressed beamforming report element.

Preferably, the determination unit includes: a frequency shift calculation unit and a duration calculation unit, wherein the frequency shift calculation unit is used to calculate the Doppler frequency shift according to the moving speed of the beamforming receiver; the duration calculation unit is used to The effective duration of the weight is calculated according to the Doppler frequency shift and the channel similarity.

Preferably, the device may further include: a third judgment unit and a third transmission unit, wherein,

The third judging unit is used to judge whether the weight is valid, and if it is valid, send the judging result that the weight is valid to the first transmission unit; send the judging result that the weight is invalid to the third transmission unit;

The third transmission unit is configured to, when the weight value is invalid, send a VHT compressed beamforming frame that does not include the VHT compressed beamforming report element to the beamforming sender.

Preferably, the third judging unit includes: a counting judging unit and/or a comparison judging unit, wherein the counting judging unit is used to judge whether the count of the counter has returned to zero, and if the count of the counter has not returned to zero, determine the If the weight value is valid, send the judgment result that the weight value is valid to the first transmission unit; otherwise, determine that the weight value is invalid, and send the judgment result that the weight value is invalid to the third transmission unit; the comparison judgment A unit for comparing the effective duration of the weight with the time T from the moment of calculating the weight to the moment of feedback of the weight; if the time T is not greater than the effective duration of the weight, it is determined that the weight is valid, and the weight A valid judgment result is sent to the first transmission unit; otherwise, it is determined that the weight is invalid, and the judgment result of the invalid weight is sent to the second transmission unit.

Preferably, the device may further include: a deletion unit connected to a third judging unit, configured to clear the weight value in the VHT compressed beamforming report element after judging that the weight value is invalid.

Preferably, before the second receiving unit receives the channel test signal notification sent by the beamforming initiator, the device may further include: a fourth receiving unit, configured to receive a medium access control MAC frame sent by the beamforming initiator The medium access control MAC frame includes first effective duration information indicating weight setting; specifically, the medium access control MAC frame sent by the beamforming initiator may be received in a unicast, broadcast or multicast manner.

The determining unit is specifically configured to: determine the weight according to the first effective duration information indicating the weight setting in the medium access control MAC frame or the second effective duration information indicating the weight setting in the beacon frame The corresponding valid duration.

Wherein, the MAC frame received by the fourth receiving unit includes: a broadcast MAC frame, a multicast MAC frame and a unicast MAC frame, wherein the broadcast MAC frame may be a beacon frame, and the multicast MAC frame It may be an NDPA frame; the unicast MAC frame may be an association request frame or an association response frame. But it is not limited to this.

Preferably, when the receiver address RA field of the channel test signal notification received by the second receiving unit includes the second effective duration information indicating weight setting, the second effective duration information is the same as the first effective duration information. - The effective duration can be the same or different,

The determining unit is specifically configured to: determine the valid duration corresponding to the weight according to the second valid duration information set by the indicated weight.

For the functions of each unit in the device and the most useful implementation process, please refer to the corresponding implementation process in the above method for details.

In order to facilitate the understanding of those skilled in the art, specific examples are used below to illustrate.

Embodiment one

In this embodiment, the validity of the compressed beamforming report stored by Beamformee is mainly determined, and the process includes:

1) The station STA receives the NDPA frame sent by the Beamformer. If it matches the associated address AID in the NDPA frame, it knows that it has become the Beamformee to be tested, and enters the test state to wait for the Beamformer to send the NDP frame.

2) After Beamformee receives the NDP frame of the test signal, it calculates the channel estimation value, and calculates the beamforming (beamforming) weight coefficient according to the channel estimation value, and saves the weight system to the compression and saves it to the VHT compression beamforming report element At the same time, according to the own moving speed (you can use channel estimation to measure speed or use GPS to measure speed, etc.), classify the moving speed (for example, it can be divided into low, medium, high speed, etc., but not limited to this). Set the duration of the counter according to the sub-level (each gear speed corresponds to a duration, and the duration unit can be us, such as the duration of low, medium and high-speed gears are respectively set to T1, T2, T3. And T1>T2>T3), save Start the counter while the VHT compresses the beamforming report elements, and the counter takes counting down as an example;

In this step, if the Beamformee determines that itself is the first Beamformee in the NDPA frame, after calculating the beamforming weight coefficient (ie weight), the weight coefficient is stored in the VHT compression beamforming report element; after that , Feedback the weights according to the following two situations: one situation is: the weight coefficients can be directly sent to the Beamforer through the VHT Compressed Beamforming frame; the other situation is to first judge whether the effective duration of the weight coefficients is valid (A process of its judgment is shown in step 3), but it is not limited to this), if valid, then send the VHT compressed beamforming report element including the weight coefficient to Beamforer through the VHT compressed beamforming frame through the VHTCompressed Beamforming frame .

If the Beamformee determines itself to be the non-first Beamformee (i.e. other Beamformees except the first Beamformee) in the NDPA frame, then perform step 3);

3) Other Beamformees respectively receive the beamforming response request (Beamforming Report Poll) frame sent by Beamforer to request feedback weights, and other Beamformees respectively first judge the compressed beamforming (that is, the weight value) stored in the VHT compressed beamforming report element ) is valid; then decide the content of the sent VHT Compressed Beamforming frame, if it is valid, send the VHT Compressed Beamforming frame containing the VHT Compressed Beamforming report element of the weight; otherwise, send the VHT Compressed Beamforming frame that does not contain the weight VHT compressed beamforming frames for report elements.

Among them, the effective process of judging the effective duration is:

If the count of the judging counter has not returned to zero, it is judged that the weight value is valid at this time, and the weight value is sent to the Beamformer with the VHTCompressed Beamforming frame as the carrier.

If the count of the counter is zero, it is determined that the weight value is invalid at this time, and a VHT compressed beamforming frame that does not include the VHT compressed beamforming report element will be sent.

In this embodiment, it may further include: if it is judged that the weight is invalid, the weight in the compressed beamforming report element may also be cleared.

Embodiment two

The difference between the second embodiment and the first embodiment is that when calculating the channel estimation value, the corresponding weight value is obtained according to the estimated value, and the weight value is saved in the element of the VHT compressed beamforming report, and the weight of the weight value is estimated. The effective duration specifically includes: calculating the Doppler frequency shift according to the moving speed of the beamforming receiver; and calculating the effective duration of the weight according to the Doppler frequency shift and channel similarity. The other processes of the second example are the same as those in the embodiment, and for details, refer to the corresponding description above.

In Embodiment 2, another judging mechanism is used to replace the counter for judging the effective duration. After the Beamformee receives the Beamforming Report Poll frame from the Beamformer, it can determine the content of the VHT Compressed Beamforming frame to be sent according to the judging result. If it is valid, it will send A VHT Compressed Beamforming frame containing weights; otherwise, a VHT Compressed Beamforming frame without weights is sent.

Among them, the judgment process for judging whether the compressed beamforming (ie weight) is effective is:

1) Calculate the Doppler frequency shift from the Beamformee's own moving rate:

${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; D.</span>}\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&upsi;</span>}}_{\mathrm{<span\; class="notranslate">\; Beamformee</span>}}}{{\mathrm{<span\; class="notranslate">\; c</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; ;</span>$

In the formula, v _Beamformee is the moving speed of Beamformee, f _c is the carrier frequency; c ₀ is the speed of light;

2) Set the channel similarity ρ _t , and then calculate the effective time from the similarity Its calculation formula is:

${\mathrm{<span\; class="notranslate">\; T</span>}}_{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; D.</span>}\mathrm{<span\; class="notranslate">\; max</span>}}}\mathrm{<span\; class="notranslate">\; arccos</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>$

3) Assuming that the time from calculating the weights to feeding back the compressed beamforming report is T _report , then compare T _report with T report before feeding back the compressed beamforming report The size of (η is a preset coefficient, which can be determined by the feedback time and the feedback to shaping time, such as T _beam is the time from Beamformer receiving the weight to using the weight, which can be an experience value; it can also be controlled only by ρ _t , and η=1 at this time):

4) if If it is established, it is judged that the compressed beamforming report is valid at this time, and the compressed beamforming report is sent to the Beamformer with the VHT Compressed Beamforming frame as the carrier.

5) Then it is judged that the compressed beamforming report is invalid, and a VHT Compressed Beamforming frame that does not include the elements of the compressed beamforming report will be sent.

Embodiment Three

The difference between the third embodiment and the first or second embodiment is that the Beamformer can instruct the Beamformee to calculate the effective duration of the weight, and the Beamformee determines the effective duration of the weight according to the indicated effective duration. Other processes of the example three are the same as the embodiment, specifically including:

1), Beamformer can indicate the effective duration of the weight value calculated by Beamformee, and the indication method of the effective duration includes the following methods:

A. The Beamformer instructs a single Beamformee to set the effective duration of calculating the weight through unicast, specifically including: before the Beamformer sends the NDPA frame, transmits a MAC containing the effective duration information (ie, the first effective duration information) to a single Beamformee frame. The MAC frame may be an association request frame or an association response frame during capability negotiation, or may be another type of frame, such as a data frame, a management frame, or a control frame, which is not limited in this embodiment.

B. Beamformer instructs a plurality of Beamformees to set the effective duration (ie, the second effective duration information) of calculating the weight through multicast mode, which specifically includes: the Beamformer sends an NDPA frame to multiple Beamformees, and the NDPA frame contains the effective duration information (that is, the second valid duration information), the valid duration information can be set in the RA field in the NDPA, or can be set in other fields in the NDPA, which is not limited in this embodiment.

Certainly, the effective duration information may also be a data frame, a management frame or a control frame, etc. sent in multicast before the NDPA frame is sent.

C. Beamformer instructs and sets the effective duration of calculation weights with all stations STA in the BSS/IBSS network by broadcasting, specifically including: the AP sends a beacon frame to all stations STA in the BSS/IBSS network, and the beacon frame contains There is valid duration information (that is, the first valid duration information).

Certainly, it may also be a data frame, an association frame or a control frame, etc. sent in a broadcast form before the NDPA frame is sent.

2) The Beamformee receives the NDPA frame sent by the Beamformer, learns that it has become the Beamformee to be tested through the AID in the STA info field, and enters the test state to wait for the Beamformer to send an NDP frame.

3), Beamformee receives the NDP frame of the test signal, calculates the channel estimation value, and calculates the beamforming weight coefficient according to the channel estimation value, and saves it in the VHT compressed beamforming report element, and at the same time, according to the effective duration specified by the Beamformer Setting the duration of the counter, starting the counter, and counting down the counter;

4) When the Beamformee receives the beamforming response request frame from the Beamforer and is requested by the Beamformer to feed back weight information, it first judges whether the saved weights are valid and then decides the form of the transmitted VHT compressed beamforming frame.

If the counter is not reset to zero, it is determined that the weight value at this time is still valid, and at the same time, a VHT compressed beamforming frame including VHT compressed beamforming report elements is sent to the Beamformer.

If the counter returns to zero, it is determined that the weight at this time is invalid, and a VHT compressed beamforming frame that does not contain the compressed beamforming report element will be sent;

5). Beamformee clears the weight information in the VHT compression beamforming report element.

In the embodiment of the present invention, the validity of the stored feedback weights is determined by setting the effective duration counter and the effective time comparison mechanism, and then the content contained in the transmitted VHT Compressed Beamforming frame is determined (that is, whether the VHT Compressed Beamforming report is included or not) element), which can prevent the information collected by Beamformer from being out of date, save the cost of occupying channel resources, and improve the communication quality.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is a better implementation Way. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM, disk , CD, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments of the present invention.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (26)

1. a transmission method for weights, is characterized in that, comprising:

The channel test signal that the shaping sender of received beam sends;

Channel is tested and obtains corresponding weights;

Determine effective duration that described weights are corresponding;

Described weights are kept at very in high-throughput VHT compressional wave beam forming form element;

In effective duration of described weights, send described VHT compressional wave beam forming form element to described beam forming sender;

Wherein, in effective duration of described weights, before sending described VHT compressional wave beam forming form element to described beam forming sender, described method also comprises:

Judge that whether described weights are effective, if effectively, then perform in effective duration of described weights, send the step of described VHT compressional wave beam forming form element to described beam forming sender; Otherwise, when described weights are invalid, send the VHT compressional wave beam forming frame not comprising described VHT compressional wave beam forming form element to described beam forming sender.

2. method according to claim 1, is characterized in that, before receiving channel test signal, described method also comprises:

The channel test signal that the shaping promoter of received beam sends is noticed;

Notice to confirm self whether to be beam forming recipient to be measured according to described channel test signal, if so, then receive channel test signal, to the step that channel is tested described in performing.

3. method according to claim 1, is characterized in that, before send described VHT compressional wave beam forming form element to described beam forming sender, described method also comprises: the beam forming response request frame that the shaping sender of received beam sends.

4. method according to claim 3, it is characterized in that, described method also comprises: judge whether self is the first beam forming recipient specified during described channel test signal is noticed, if, perform in effective duration of described weights, send the step of described VHT compressional wave beam forming form element to described beam forming sender; Otherwise, perform the beam forming response request frame that the shaping sender of described received beam sends; In effective duration of described weights, send the step of described VHT compressional wave beam forming form element to described beam forming sender.

5. method according to claim 1, is characterized in that, describedly sends described VHT compressional wave beam forming form element to described beam forming sender and specifically comprises:

Described VHT compressional wave beam forming form element is sent to described beam forming sender by VHT compressional wave beam forming frame.

6. method according to claim 1, is characterized in that, the described effective duration determining that described weights are corresponding comprises:

Determine self translational speed of beam forming recipient; Carry out stepping according to the size of described translational speed, obtain the speed of different shelves; For effective duration that each grade of Speed Setting is corresponding, described effective duration is controlled by counter; Described effective weights are being kept in VHT compressional wave beam forming form element, are starting counter counts down; Or

Doppler frequency shift is calculated according to the rate travel of beam forming recipient; According to effective duration of described Doppler frequency shift and channel Similarity Measure weights.

7. method according to claim 1, is characterized in that, described method also comprises: after judging that described weights are invalid, empties the described weights in described VHT compressional wave beam forming form element.

8. method according to claim 1, is characterized in that, described judge described weights whether effective process comprise:

Judge whether the counting of counter makes zero, if the counting of counter does not make zero, then judge that described weights are effective; Otherwise, judge that described weights are invalid; Or

The time T in effective duration of more described weights and setup algorithm weights moment to feedback weight moment, if described time T is less than or equal to effective duration of weights, then judges that described weights are effective; Otherwise no person judges that described weights are invalid.

9. method according to claim 2, is characterized in that, before the channel test signal notice that the shaping promoter of received beam sends, described method also comprises:

The media access control MAC frame that the shaping promoter of received beam sends, described mac frame comprises first effective duration information of instruction weight setting;

The described effective duration determining that described weights are corresponding is specially: determine according to first effective duration information of the instruction weight setting in described mac frame effective duration that described weights are corresponding.

10. method according to claim 9, is characterized in that, described mac frame comprises: broadcast MAC frame, multicast MAC frames or clean culture mac frame.

11. methods according to claim 10, is characterized in that, described broadcast MAC frame is beacon frame, and described multicast MAC frames is NDPA frame; Described clean culture mac frame is association request frame or association response frame.

12. methods according to claim 9, is characterized in that,

The media access control (MAC) frame that the shaping promoter of described received beam sends specifically comprises: the media access control (MAC) frame sent by the shaping promoter of clean culture, broadcast or multicast mode received beam.

13. methods according to claim 2, it is characterized in that, the receiving terminal address RA field that described channel test signal is noticed comprises second effective duration information of instruction weight setting, wherein, described second effective duration information and first effective duration identical or different

The described effective duration determining that described weights are corresponding is specially: determine according to second effective duration information of described instruction weight setting effective duration that described weights are corresponding.

The transmitting device of 14. 1 kinds of weights, is characterized in that, comprising:

First receiving element, for the channel test signal that the shaping sender of received beam sends;

Test cell, obtains corresponding weights for testing channel;

Determining unit, for determining effective duration that described weights are corresponding;

Memory cell, for being kept at very in high-throughput VHT compressional wave beam forming form element by described weights;

3rd judging unit, for judging that whether weights are effective, if effectively, sends to the first transmission unit by effective for weights judged result; Judged result invalid for weights is sent to the 3rd transmission unit;

Described first transmission unit, in effective duration of described weights, sends described VHT compressional wave beam forming form element to described beam forming sender;

Described 3rd transmission unit, for when described weights are invalid, sends the VHT compressional wave beam forming frame not comprising described VHT compressional wave beam forming form element to described beam forming sender.

15. devices according to claim 14, is characterized in that, also comprise:

Second receiving element, for before described first receiving element receives described channel test signal, the channel test signal that the shaping promoter of received beam sends is noticed;

First judging unit, confirm self whether to be beam forming recipient to be measured for noticing according to described channel test signal, and when confirming self to be beam forming recipient to be measured, start the channel test signal that the shaping sender of described first receiving element received beam sends.

16. devices according to claim 14, is characterized in that, also comprise:

3rd receiving element, is connected with described first transmission unit, for receiving the beam forming response request frame that described beam forming sender sends;

Second transmission unit, for receive at the 3rd receiving element described beam forming sender send beam forming response request frame after, in effective duration of described weights, send described VHT compressional wave beam forming form element to described beam forming sender.

17. devices according to claim 16, is characterized in that, also comprise:

Second judging unit, for judging whether self is the first beam forming recipient specified during described channel test signal is noticed, and sends to the first transmission unit by the judged result being; No judged result is sent to the second transmission unit.

18. devices according to claim 14, is characterized in that, described first transmission unit specifically for: send described VHT compressional wave beam forming form element by VHT compressional wave beam forming frame to described beam forming sender.

19. devices according to claim 14, is characterized in that, described determining unit comprises:

Speed determining unit, for determining self translational speed of beam forming recipient;

Stepping unit, carries out stepping for the size according to described translational speed, obtains the speed of different shelves;

Duration setup unit, for being effective duration corresponding to each grade of Speed Setting, described effective duration is controlled by counter;

Count enable unit, for when described weights are kept in VHT compressional wave beam forming form element by described memory cell, starts counter counts down.

20. devices according to claim 14, is characterized in that, described determining unit comprises:

Frequency displacement computing unit, calculates Doppler frequency shift for the rate travel according to beam forming recipient;

Duration calculation unit, for the effective duration according to described Doppler frequency shift and channel Similarity Measure weights.

21. devices according to claim 14, is characterized in that, described 3rd judging unit comprises:

Counting judging unit, for judging whether the counting of counter makes zero, if the counting of counter does not make zero, then determines that described weights are effective, effective for weights judged result is sent to described first transmission unit; Otherwise, determine that described weights are invalid, judged result invalid for weights sent to described 3rd transmission unit; And/or

Comparison judgment unit, for comparing effective duration of weights and the time T calculating weights moment to the feedback weight moment; If described time T is not more than effective duration of weights, then determines that described weights are effective, effective for weights judged result is sent to described first transmission unit; Otherwise, determine that described weights are invalid, judged result invalid for weights sent to described 3rd transmission unit.

22. devices according to claim 14, is characterized in that, described device also comprises: delete cells, are connected with the 3rd judging unit, for after judging that described weights are invalid, empty the described weights in described VHT compressional wave beam forming form element.

23. devices according to claim 15, is characterized in that, before the channel test signal notice that the shaping promoter of described second receiving element received beam sends, described device also comprises:

4th receiving element, for the media access control MAC frame that the shaping promoter of received beam sends, described mac frame comprises first effective duration information of instruction weight setting;

Described determining unit specifically for: determine according to first effective duration information of the instruction weight setting in described mac frame effective duration that described weights are corresponding.

24. devices according to claim 23, it is characterized in that, the described mac frame that described 4th receiving element receives comprises: broadcast MAC frame, multicast MAC frames and clean culture mac frame, wherein, described broadcast MAC frame is beacon frame, and described multicast MAC frames is NDPA frame; Described clean culture mac frame is association request frame or association response frame.

25. devices according to claim 23, is characterized in that, described 4th receiving element, especially by the media access control MAC frame that the shaping promoter of clean culture, broadcast or multicast mode received beam sends.

26. devices according to claim 15, it is characterized in that, when the receiving terminal address RA field that the described channel test signal that described second receiving element receives is noticed comprises second effective duration information of instruction weight setting, described second effective duration information and first effective duration information identical or different

Described determining unit specifically for: determine according to second effective duration information of described instruction weight setting effective duration that described weights are corresponding.