WO2013037313A1 - Weight transmission method and device - Google Patents

Abstract

Provided in an embodiment of the present invention are a weight transmission method and device, the method comprising: receiving a channel sounding signal transmitted by a beamformer; sounding the channel and obtaining a corresponding weight; determining the valid time period corresponding to the weight; saving the weight in a very high throughput (VHT) compressed beamforming report element; within the valid time period of the weight, transmitting to the beamformer a VHT compressed beamforming frame carrying the VHT compressed beamforming report element. In the embodiment of the present invention, a beamformee obtains the corresponding weight after sounding the channel, sets up a time period corresponding to the weight, judges the time period validity of the weight, and feeds back the weight to the beamformer, thus avoiding the expiration of the weight information acquired by the beamformer and improving subsequent communication quality.

Description

 Method and device for transmitting weights

 The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting weights.

Background technique

 With the development of communication technologies, in wireless local area networks, in order to improve communication quality, there is a channeling (Sounding) mechanism between a Beamformer site and a Beamformee site. The sounding mechanism specifically includes:

First, the Beamformer site sends a NDPA (Null Data Packet Announcement) frame to a single or multiple Beamformee sites, and notifies the associated address (AID, Assocation identifier) that is carried in the advertisement frame. The matched Beamformee site is ready for channel sounding and indicates the content of its feedback weight. Then, the Beamformer sends a null data packet (NDP, Null Data Packet) frame that does not contain data, and provides the channel test parameters for the Beamformee. The Beamformee station performs the test after receiving the NDP frame, calculates the weight according to the test result, and saves the calculated weight to the VHT (Very High Throughput) compression beamforming report. After the SIFS period after the NDP transmission, the single Beamformee or null packet announces that the first channel detection in the NDPA frame, Beamformee, sends a VHT Compressed Beamforming †j3⁄4 containing the VHT compressed beamforming report element to the Beamformer; beamformer said NDPA † j¾ sequentially to the other transmission beamformer response request BeamformeeBeamformee ¹ Chen (beamforming Report Poll) frame, however, since the other Beamformee NDPA frame not received NDP NDPA frame or frames, do not test channel, Therefore, the latest calculation weight cannot be obtained. If the Beamformee has a compressed beamforming report (the weight in the report is not up-to-date), the VHT Compressed Beamforming frame containing the VHT compression beamforming 4艮 table element is normally sent. If Beaformee does not have a compressed beamforming report, or if there is no weight in the report, then a VHT Compressed Beamforming frame containing no compressed beamforming report elements is sent.

In the research and practice of the prior art, the inventors of the present invention found that the existing implementation In the method, the compressed beamforming 4 table stored by Berformee may be invalid. If the saved compressed beamforming 4 艮 table is sent without identification, the feedback weight collected by Beamformer may expire. Affect the quality of subsequent communications.

Summary of the invention

 The embodiments of the present invention provide a method and an apparatus for transmitting weights to solve the technical problem that the weights received in the prior art are expired, so as to improve communication quality.

 To solve the above technical problem, an embodiment of the present invention provides a method for transmitting a weight, where the method includes:

 Receiving a channel test signal sent by the beamforming sender;

 Testing the channel to obtain a corresponding weight;

 Determining a valid duration corresponding to the weight;

 The weight is stored in a very high throughput VHT compressed beamforming report element; the VHT compressed beamforming report element is sent to the beamforming sender within an effective duration of the weight.

 Correspondingly, the embodiment of the present invention further provides a weight transmission device, where the device includes: a first receiving unit, configured to receive a channel test signal sent by a beamforming sender; and a testing unit, configured to test the channel Corresponding weight;

 a determining unit, configured to determine a valid duration corresponding to the weight;

 a storage unit, configured to save the weight in a VH compression beamforming report element of a very high throughput rate;

 And a first transmission unit, configured to send the VHT compressed beamforming report element to the beamforming sender within an effective duration of the weight.

DRAWINGS

 FIG. 1 is a flowchart of a method for transmitting weights according to an embodiment of the present invention;

 2 is a flowchart of another method for transmitting weights according to an embodiment of the present invention;

 FIG. 3 is a schematic structural diagram of a frame of an NDPA frame according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a weight transmission apparatus according to an embodiment of the present invention. detailed description

 The embodiments of the present invention are further described in detail below in conjunction with the drawings and embodiments.

 1 is a flowchart of a method for transmitting weights according to an embodiment of the present invention; the method includes steps;

 Step 101: Receive a channel test signal sent by a beamforming sender (Beamformer); in this step, all beamforming receivers (Beamformee), single beamforming receivers, or stations (STA, Station) receive beamforming transmission The channel test signal sent by the person. The channel test signal may be a null data packet (NDP) frame, and the purpose thereof is to provide channel test parameters for the beamforming receiver. However, the present invention is not limited thereto, and may have other empty frames that do not include data. This embodiment is not limited.

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

 Wherein, the channel is tested, for example, by using channel estimation to test the channel. That is to say, after receiving the channel test signal, the beamforming receiver tests the channel of the channel by means of channel estimation, and obtains the weight according to the test result.

 Step 103: Determine an effective duration corresponding to the weight; the first one is: 1) determining a beamforming receiver's own moving speed;

 2) According to the moving speed, the binning is performed to obtain the grades of different speeds; for example, it is divided into three files of high, medium and low, but is not limited thereto.

 3) Set the corresponding effective duration for each speed. The effective duration can be controlled by the counter or by other similar counting components. The higher the grade, the shorter the effective duration of the setting.

 4) The counter is counted down while the weight is stored in the VHT (very High Throughput) compression beamforming report element.

In this step, the counter is counted as a decrement. Of course, the counter can be set to be incremented as an example, which is not limited in this embodiment. For example, each speed grade corresponds to a valid duration. The effective duration unit can be us. For example, the duration of low, medium, and high speed files is set to T1, T2, and T3.

Τ1>Τ2>Τ3, the counter is started while the weight is saved in the VHT compressed beamforming report element, and the counter is counted down.

 The second is: 1) Calculating the Doppler shift according to the beamforming receiver's moving rate;

 2) Calculating the effective duration of the weight according to the Doppler shift and the channel similarity.

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

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

 In a fifth aspect, when the channel test signal notification includes the third valid duration information indicating the weight setting, wherein the third valid duration information may be the same as the first valid duration or the second valid duration, Can be different,

 The determining the effective duration corresponding to the weight is specifically: determining, according to the third valid duration information set by the indication weight, an effective duration corresponding to the weight. The embodiment is not limited in this embodiment.

Step 104: Save the weight in the VH compression beamforming report element of the very high throughput rate. Step 105: Send the beamforming to the beamforming within the valid duration of the weight (ie, the effective time of the weight) The VHT compressed beamforming device element is transmitted. For example, the VHT compressed beamforming report element may be sent to the beamforming sender through a VHT compressed beamforming frame, but is not limited thereto, and may also be transmitted through other frames. The beamforming initiator is caused to weight the transmitted signal to improve the reception of the beamforming receiver.

 Preferably, in this embodiment, before the 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; Sending the VHT compressed beamforming report element to the beamforming sender within a valid duration of the weight, specifically transmitting the VHT compressed beamforming to the beamforming sender through a VHT compressed beamforming frame^艮 Table element.

 Preferably, the method may further include: determining whether it is the first beamforming receiver specified in the channel test signal advertisement, and if yes, performing the beamforming in the effective duration of the weight Transmitting the VHT compressed beamforming report element; otherwise, performing a beamforming response request frame sent by the receive beamforming sender; transmitting, to the beamforming sender, within the effective duration of the weight The steps of VHT compression beamforming.

 That is, in this step, if the beamforming receiver determines that it is the first beamforming receiver specified in the channel test signal announcement, the beamforming is sent to the beamforming within the valid time of the weight Transmitting a VHT compressed beamforming frame including the VHT compressed beamforming report element; or

 If the beamforming receiver determines that it is the non-first beamforming receiver specified in the channel test signal announcement, after receiving the beamforming response request frame transmitted by the beamforming sender, when the weight is valid And transmitting, to the beamforming sender, a VHT compressed beamforming frame including the VHT compressed beamforming element.

 In the embodiment of the present invention, after the beamforming receiver tests the channel, the corresponding weight is obtained, and the effective duration of the corresponding weight is set, and after determining that the weight is valid, the beamforming sender is further The feedback of the weight value solves the expiration of the weight information collected by the beamforming sender, saves the occupation cost of the channel resource, and improves the quality of the subsequent communication.

FIG. 2 is a flowchart of another method for transmitting weights according to an embodiment of the present invention, where the method includes: Step 201: Receive a channel test signal notification sent by a beamforming initiator.

 In this step, the channel test signal advertisement may be an NDPA (Null Data Packet Announcement) frame, but is not limited thereto. A schematic diagram of a frame structure of the NDPA frame is shown in FIG. 3. In FIG. 3, the NDPA frame includes the following fields: frame control, duration, receiver address (RA, Receiver address), and sender address (TA, Transmitter address ), a sounding sequence, a station STA Info1 to STA InfoN, and a frame check sequence K ' K FCS , Frame Check Sequence ), etc., wherein the sounding sequence further includes: a reserved field and a number of sequences; STA1 Infol includes: an association identifier (AID, Associative Address), a feedback type, and an NC Index, as shown in FIG. Similarly, in the STA InfoN, each site may include an AID, a feedback type, and an NC Index, which are not shown in the figure.

 In FIG. 3, if the receiving end address RA is a unicast address, the Beamformer is instructed to perform channel sounding on a single Beamformee, where STA Info n is n=l;

 If the receiving end address RA is a multicast address, the Beamformer is configured to perform channel sounding on multiple Beamformees, and η>1 in the STA Info n;

 The beamforming receiver can also determine whether it is the first beamforming receiver or the first beamforming receiver based on the receiving address.

 The sounding sequence is used to indicate the order of the NDPA frames, and is used to indicate the number of NDPA frame batches corresponding to the VHT compression beamforming of the Beamformee feedback;

 The STA info is used to indicate that the STA (the AID is the number of the corresponding STA) is ready to listen to the NDP frame for channel detection;

 The AID field represents the associated address AID assigned by Beamformer to Beamformee. The Feedback Type field represents the feedback type and is mainly used to distinguish between SU-MIMO (Feeding Type = 0) scenes and MU-MIMO (Feedback Type = 1) scenes.

 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, according to the channel test signal, whether it is the beamforming receiver to be tested, and if yes, perform step 203; otherwise, execute step 208 to end the process; In this step, if the receiving beamforming receiver matches the associated address AID advertised by the channel test signal, the receiving beamforming receiver is the beamforming receiver to be tested, and then the beamforming to be tested The receiver enters the test state and waits for the channel test signal (such as an NDP frame, etc.) sent by the beamforming sender.

 Step 203: Receive a channel test signal sent by a beamforming sender.

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

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

 Step 205: Determine a valid duration corresponding to the weight;

 The specific process for determining the effective duration corresponding to the weight is detailed in the corresponding description above.

 Step 206: Save the weight in a VHT compressed beamforming report element.

 Step 207: Send, to the beamforming sender, a VHT compressed beamforming frame including the VHT compressed beamforming report element within the valid duration of the weight.

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

 In this embodiment, steps 203 to 207 are specifically described above.

 On the basis of the foregoing embodiment, before the VHT compressed beamforming frame including the VHT compressed beamforming report element is sent to the beamforming sender within the valid time of the weight, the method may further include :

 Determining whether the weight is valid, if the weight is valid, performing the step of transmitting the VHT compressed beamforming element to the beamforming sender within the valid time of the weight; otherwise, in the right Sending, to the beamforming sender, the VHT compressed beamforming report element to the beamforming sender, eg, transmitting the VHT compressed beamforming frame that does not include the VHT compressed beamforming report element to the beamforming sender .

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

The process of determining whether the weight is valid is described in the following two examples. But it is not limited to this:

 One is to determine whether the counter count is zero or not, and if the counter count is not reset to zero, it is determined that the valid duration is valid; otherwise, the valid duration is determined to be invalid;

 The other is: if the time period for calculating the effective duration of the weight is set to the time T after the feedback weight time, the effective duration of the weight is compared with the set time T, if the time T is less than or equal to the weight The effective duration of the weight is determined to be valid; otherwise, the effective duration of the weight is determined to be invalid.

 In another embodiment, the beamforming receiver receives the media access control MAC frame sent by the beamforming initiator, where the media access control MAC frame includes the first valid duration information indicating the weight setting; Receiving, by the unicast, broadcast, or multicast mode, the media access control frame sent by the beamforming initiator; where any field in the MAC frame may include the first valid duration information indicating the weight setting, for example, An existing field, a reserved field, or an extended field in the MAC frame.

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

 Then, the beamforming receiver determines the effective duration corresponding to the weight according to the first valid duration information set in the media access control frame.

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

 Preferably, in this example, the MAC frame may include: a broadcast MAC frame, a multicast MAC frame, or a unicast MAC frame. The broadcast MAC frame may be a beacon frame, and 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 notification sent by the beamforming initiator; and according to the channel test signal, announces whether it is the beamforming receiver to be tested, and confirms that it is waiting for When measuring the beamforming receiver, enter the channel test state; And

 After receiving the channel test signal sent by the beamforming sender, the channel is tested to obtain a corresponding weight, wherein the channel test signal notification includes second effective duration information indicating a weight setting, and the second valid The duration information is the same as or different from the first effective duration. Specifically, the second valid duration information indicating the weight setting may be included in the receiving end address RA field of the channel test signal notification, but is not limited thereto.

 And determining, by the beamforming receiver, the effective duration corresponding to the weight according to the second valid duration information set by the indication weight, and saving the weight in the VHT compressed beamforming report element, and at the weight Within the effective duration, a VHT compressed beamforming frame including the VHT compressed beamforming report element is transmitted to the beamforming sender.

 Preferably, in this embodiment, the beamforming receiver receives the channel test signal notification sent by the beamforming initiator in a multicast manner.

 In the embodiment of the present invention, the validity of the saved feedback weight is determined by setting a counter of effective duration and a valid time comparison mechanism, and then determining the content of the VHT Compressed Beamforming frame that is sent (ie, whether the storage right is included) The value of VHT compression beamforming is only a table element), which can prevent the information collected by Beamformer from expiring.

 Based on the implementation process of the foregoing method, the embodiment of the present invention further provides a weight transmission device, and a schematic structural diagram thereof is shown in FIG. 4, the device includes: a first receiving unit 41, a testing unit 42, a determining unit 43, and storing Unit 44 and first transmission unit 45, wherein

 The first receiving unit 41 is configured to receive a channel test signal sent by a beamforming sender. The channel test signal may be an NDP frame, and the purpose is to provide a channel test parameter for the receiver. However, the present invention is not limited thereto, and may have other empty frames that do not include data.

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

 Wherein, the channel is tested, for example, by using channel estimation to test the channel. That is to say, after receiving the channel test signal, the beamforming receiver tests the channel of the channel by means of channel estimation, and obtains the weight according to the test result.

The determining unit 43 is configured to determine a valid duration corresponding to the weight; one is: 1) determining Beamforming the receiver's own moving speed; 2) According to the moving speed, the binning is performed to obtain the speed of different gears; for example, it is divided into high, middle, and low gears, but it is not obvious. 3) Set a corresponding duration for each speed, which is controlled by a counter; that is, the higher the speed, the shorter the set duration. 4) At the same time as saving the weight in the compressed beamforming report, the counter is counted down. The other is: 1) calculating the Doppler shift according to the beamforming receiver's moving rate; 2) calculating the duration of the weight according to the Doppler shift and the channel similarity. However, the duration of the specific determination of 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 save the weight in a VH compression beamforming report element of a very high throughput rate;

 The first transmission unit 45 is configured to send, by using the VHT compression beamforming frame, the VHT compressed beamforming frame element, within the effective duration of the weight, to the beamforming sender. The beamforming sender transmits the VHT compressed beamforming element.

 Preferably, the device may further include: a second receiving unit and a first determining unit, where the second receiving unit is configured to receive a beam before the first receiving unit receives the channel test signal a channel test signal sent by the molding initiator; a first determining unit, configured to advertise, according to the channel test signal, whether it is a beamforming receiver to be tested, and when confirming that it is a beamforming receiver to be tested, The first receiving unit is activated to receive a channel test signal sent by the beamforming sender.

 Preferably, the device may further include: a third receiving unit, configured to receive, by the first transmitting unit, a beamforming response request frame sent by the beamforming sender;

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

Preferably, the device may further include: a second determining unit, configured to determine whether it is the first beamforming receiver specified in the channel test signal notification, and send the determination result of the yes to the first transmission unit; The judgment result of No is sent to the second transmission unit. Preferably, the determining unit includes: a speed determining unit, a binning unit, a time length setting unit, and a counting start unit, wherein the speed determining unit is configured to determine a beamforming receiver's own moving speed; And the speed is set according to the magnitude of the moving speed to obtain a speed of different speeds; the duration setting unit is configured to set a corresponding effective duration for each speed, and the duration is controlled by a counter; The counting start unit is configured to start the counter down counting when the storage unit saves the weight in the VHT compressed beamforming report element.

 Preferably, the determining unit includes: a frequency shift calculating unit and a time length calculating unit, wherein the frequency shift calculating unit is configured to calculate a Doppler frequency shift according to a beamforming receiver moving rate; the duration calculating unit is configured to: The effective duration of the weight is calculated according to the Doppler shift and the channel similarity.

 Preferably, the device may further include: a third determining unit and a third transmitting unit, wherein the third determining unit is configured to determine whether the weight is valid, and if valid, send the determining result of the valid value to Transmitting, by the first transmission unit, a determination result that the weight is invalid to the third transmission unit;

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

 Preferably, the third determining unit includes: a counting determining unit and/or a comparing determining unit, wherein the counting determining unit is configured to determine whether the counter is reset to zero, and if the counter is not zeroed, determine The weight value is valid, and the judgment result that the weight is valid is sent to the first transmission unit; otherwise, the weight is invalid, and the judgment result that the weight is invalid is sent to the third transmission unit; a unit, configured to compare a valid duration of the weight with a time T at which the weight time is calculated to be a feedback weight; if the time T is not greater than a valid duration of the weight, determining that the weight is valid, and the weight is The valid judgment result is sent to the first transmission unit; otherwise, it is determined that the weight is invalid, and the judgment result that the weight is invalid is sent to the second transmission unit.

 Preferably, the device may further include: a deleting unit, configured to be connected to the third determining unit, configured to clear the weight in the VHT compressed beamforming report element after determining that the weight 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 the beamforming initiator The media access control MAC frame is sent, and the media access control MAC frame includes first valid duration information indicating a weight setting; specifically, the media connection sent by the beamforming initiator may be received by using a unicast, broadcast, or multicast manner. Incoming control MAC frame.

 The determining unit is specifically configured to: determine the weight according to the first valid duration information set by the indication weight in the media access control MAC frame or the second valid duration information set by the indication weight in the beacon frame. Corresponding effective duration.

 The MAC frame received by the fourth receiving unit includes: a broadcast MAC frame, a multicast MAC frame, and a unicast MAC frame, where 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 second end time information indicating the weight setting is included in the receiving end address RA field of the channel test signal received by the second receiving unit, the second effective duration information and the first The effective duration can be the same or different.

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

 For the function and the most used implementation process of each unit in the device, refer to the corresponding implementation process in the above method.

 In order to facilitate the understanding of those skilled in the art, the following specific examples are given.

 Embodiment 1

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

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

2) After Beamformee receives the NDP frame of the test signal, calculates the channel estimation value, calculates a beamforming weight coefficient according to the channel estimation value, and saves the weight system to the compressed and saved to the VHT compressed beamforming report element. Medium, at the same time, according to its own moving speed (can be used The channel estimation speed or the GPS speed is used, and the moving speed is binned (for example, it can be classified into low, medium, high speed, etc., but is not limited thereto). Set the duration of the counter according to the binning (each gear speed corresponds to one duration, the duration unit can be us, for example, the durations of low, medium and high gear are set to T1, T2, T3 respectively, and Τ1>Τ2>Τ3), save The counter is started by VHT compression beamforming, and the counter is counted as a descending count;

 In this step, if Beamformee determines that it is the first Beamformee in the NDPA frame, after calculating the beamforming weight coefficient (ie weight), the weight coefficient is saved in the VHT compressed beamforming report element; The feedback weight is performed according to the following two situations: one case is that the weight coefficient can be directly sent to the Beamforer through the VHT Compressed Beamforming frame; in another case, it is first determined whether the effective duration of the weight coefficient is valid. (A process of determining is as shown in step 3), but is not limited to this. If valid, the VHT compressed beamforming report element including the weight coefficient is sent to the VHT compressed beamforming frame through the VHT Compressed Beamforming frame. Beamforer.

 If Beamformee determines that it is not the first Beamformee in the NDPA frame (ie, other Beamformee except the first Beamformee), then perform step 3);

 3), other Beamformee respectively in the Beamforming Report Poll frame sent to Beamforer, request feedback weight, other Beamformee first judge the compression beamforming stored in the VHT compressed beamforming report element (ie right) Whether the value is valid; then decides the content of the transmitted VHT Compressed Beamforming frame, if valid, sends the VHT compressed beamforming frame of the VHT compressed beamforming report element containing the weight; otherwise, sends the VHT compressed beam without the weight VHT compressed beamforming frames of the formed report elements.

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

 If it is judged that the counter count is not reset to zero, it is determined that the weight is valid at this time, and the weight is sent to the Beamformer by using VHT Compressed Beamforming†贞 as a carrier.

 If the counter count is zero, then it is determined that the weight is invalid at this time, and a VHT compressed beamforming frame that does not contain the VHT compressed beamforming element will be transmitted.

In this embodiment, the method may further include: if it is determined that the weight is invalid, the compression may also be cleared. The weight in the beamforming report element.

 Embodiment 2

 The second embodiment differs from the first embodiment in that, when the channel estimation value is calculated, the corresponding weight is obtained according to the estimated value, and the weight is saved in the VHT compressed beamforming report element, and the weight is budgeted. The effective duration includes: calculating a Doppler shift according to a beamforming receiver's moving rate; and calculating an effective duration of the weight according to the Doppler shift and the channel similarity. The other processes of the second example are the same as the embodiments, and the details are as described above.

 In the second embodiment, another judgment mechanism is used instead of the counter for determining the effective duration. After Beamformee receives the Beamforming Report Poll from Beamformer, the content of the transmitted VHT Compressed Beamforming frame can be determined according to the determination result. Then send a VHT Compressed Beamforming frame containing the weight; otherwise, send the VHT Compressed Beamforming without the weight.

 Wherein, the judging process for judging whether the compression beamforming (ie, the weight) is valid is:

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

 /"* ― Beamformee f

 Dmax ― J c

 Co ;

Where, "B _ea mf. _mee is the speed at which Beamformee moves, is the carrier frequency; ^c is the speed of light; 2) sets the channel similarity A, and then calculates the effective time ^p t ' from the similarity. The formula is:

-arccos (A )

 Dmax

3) Assume that the time to calculate the weight to feedback compression beamforming report is, then compare the size of ⁷ ^" with ⁷⁷⁷ ^ before feedback compression beamforming report (for pre-set coefficients, from feedback time and feedback to shaping time) Decide, such as ^{Τ + Ί} 1; for the time that Beamformer receives the weight to use the weight, it can be the empirical value; or it can be controlled only by this time ^{= 1} ): 4) If ^re P. ^{When rt} - ^{1 is} established, it is judged that the compressed beamforming table is valid at this time, and the compressed beamforming report is sent to Bsamformsr by using the VHT Compressed Beamforming frame as a carrier.

5) T _report > η Τ _β , then judge that the compressed beamforming report is invalid, and send a VHT Compressed Beamforming frame that does not contain compressed beamforming.

 Embodiment 3

 The third embodiment differs from the first embodiment or the second embodiment in that: Beamformer can indicate the effective duration of the beamformee calculation weight, and the Beamformee determines the effective duration of the weight according to the indicated effective duration. The other processes of the third example are the same as the embodiment, and specifically include:

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

 A. The Beamformer indicates, by using a unicast mode, the effective duration of the calculation of the weight of the single Beamforme, which includes: the Beamformer transmits a MAC containing the valid duration information (ie, the first valid duration information) to the single Beamformee before sending the NDPA frame. frame. The MAC frame may be an association request frame or an association response frame, 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. The beamformer indicates, by using the multicast mode, the effective duration of the calculation of the weights of the plurality of Beamformes (ie, the second effective duration information), and the method includes: sending, by the Beamformer, an NDPA frame to the plurality of Beamformees, where the NDPA frame includes the valid duration The information (that is, the second valid duration information) may be set in the RA field in the NDPA or in other fields in the NDPA, which is not limited in this embodiment.

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

 C. The beamformer indicates, by using the broadcast mode, the effective duration of calculating the weights of all the STAs in the BSS/IBSS network, and the method includes: the AP sends a beacon frame to all STAs in the BSS/IBSS network, where the beacon frame includes There is valid duration information (ie the first valid duration information).

Of course, it may also be a data frame, an associated frame or a control frame, etc., which is transmitted in a broadcast form before the NDPA frame is transmitted. 2) Beamformee receives the NDPA frame sent by Beamformer, and knows that it becomes Beamformee to be tested through the AID of STA info field, and enters the test state to wait for Beamfomer to send NDP frame.

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

 4) When Beamformee receives the beamforming response request frame from Beamforer and the Beamformer requests feedback weight information, it first determines whether the saved weight is valid and then determines the form of the transmitted VHT compressed beamforming frame.

 If the counter is not zeroed, then it is determined that the weight at this time is still valid, and a VHT compressed beamforming frame containing the VHT compressed beamforming 元素 table element is transmitted to the Beamformer.

 If the counter is zeroed, it is determined that the weight at this time is invalid, and a VHT compressed beamforming frame that does not contain a compressed beamforming table element is transmitted;

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

 In the embodiment of the present invention, the validity of the saved feedback weight is determined by setting an effective duration counter and an effective time comparison mechanism, and then determining the content of the VHT Compressed Beamforming frame that is sent (ie, whether VHT compression beamforming is included) The report element) can prevent the occurrence of information collected by Beamformer, save the cost of channel resources, and improve the communication quality.

 It should be noted that, in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations. There is any such actual relationship or order between them. Furthermore, the terms "comprising," "comprising," or "includes" are intended to include a non-exclusive inclusion, such that a process, method, article, or device that includes a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. Without further restrictions, the statement "includes a ..., a defined element, It is not excluded that there are additional identical elements in the process, method, article or device that comprises the described elements.

Through the description of the above embodiments, those skilled in the art can clearly understand the present invention. It can be implemented by means of software plus the necessary general hardware platform, of course, it can also be through hardware, but in many cases the former is a better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM or a disk. , an optical disk, etc., includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

 The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It is considered as the scope of protection of the present invention.

Claims

Rights request  A method for transmitting a weight, comprising:  Receiving a channel test signal sent by the beamforming sender;  Testing the channel to obtain a corresponding weight;  Determining a valid duration corresponding to the weight;  Saving the weight in a very high throughput VHT compressed beamforming report element;  The VHT compression beamforming report element is sent to the beamforming sender within an effective duration of the weight.  The method according to claim 1, wherein the method further comprises: before receiving the channel test signal, the method further comprising:  Receiving a channel test signal notification sent by the beamforming initiator;  And confirming, according to the channel test signal, whether it is the beamforming receiver to be tested, and if so, performing the step of receiving the channel test signal and testing the channel.  3. The method according to claim 1, wherein before transmitting the VHT compressed beamforming report element to the beamforming sender, the method further comprises: receiving a beamforming response sent by the beamforming sender Request frame.  4. The method according to claim 3, wherein the method further comprises: determining whether it is the first beamforming receiver specified in the channel test signal notification, and if so, performing the weighting The step of transmitting the VHT compressed beamforming report element to the beamforming sender during the effective duration; otherwise, performing a beamforming response request frame sent by the receiving beamforming sender; the effective duration of the weight The step of transmitting the VHT compressed beamforming table element to the beamforming sender.  The method according to claim 1, wherein the sending the VHT compressed beamforming report element to the beamforming sender comprises:  The VHT compression beamforming report element is transmitted to the beamforming sender via a VHT compressed beamforming frame. The method according to claim 1, wherein the determining the weight corresponds to The valid duration includes:  Determining the movement speed of the beamforming receiver itself; performing the binning according to the magnitude of the moving speed to obtain the speed of the different gears; setting a corresponding effective duration for each gear speed, the effective duration being controlled by the counter; The effective weight is stored in the VHT compressed beamforming report element, and the counter is counted down; or  Calculating the Doppler shift according to the beamforming receiver's moving rate; calculating the effective duration of the weight based on the Doppler shift and the channel similarity.  The method according to any one of claims 1 to 6, wherein the method further comprises:  Determining whether the weight is valid, if valid, performing the step of transmitting the VHT compressed beamforming element to the beamforming sender within an effective duration of the weight; otherwise, in the right When the value is invalid, a VHT compressed beamforming frame that does not include the VHT compressed beamforming report element is transmitted to the beamforming sender.  The method according to claim 7, wherein the method further comprises: after determining that the weight is invalid, clearing the weight in the VHT compressed beamforming report element.  9. The method according to claim 7, wherein the determining whether the weight is valid comprises:  Determining whether the count of the counter is zero or not, if the count of the counter is not zero, determining that the weight is valid; otherwise, determining that the weight is invalid; or  Comparing the effective duration of the weight with the time T when the calculated weight time is set to the feedback weight moment, if the time T is less than or equal to the effective duration of the weight, determining that the weight is valid; otherwise, determining otherwise The weight is invalid.  The method according to claim 2, wherein before receiving the channel test signal notification sent by the beamforming initiator, the method further includes:  Receiving, by the beamforming initiator, a media access control MAC frame, where the MAC frame includes first valid duration information indicating a weight setting; Determining the effective duration corresponding to the weight is specifically: according to the indication in the MAC frame The first valid duration information set by the value determines the effective duration corresponding to the weight.  The method according to claim 10, wherein the MAC frame comprises: a broadcast MAC frame, a multicast MAC frame or a unicast MAC frame.  The method according to claim 11, wherein the broadcast MAC frame is a beacon frame, and the multicast MAC frame is an NDPA frame; and the unicast MAC frame is an association request frame or an associated response frame.  13. The method of claim 10, wherein  The media access control frame sent by the receiving beamforming initiator specifically includes: receiving, by using a unicast, broadcast, or multicast mode, a media access control frame sent by a beamforming initiator.  The method according to claim 2, wherein the receiving end address RA field advertised by the channel test signal includes second effective duration information indicating a weight setting, wherein the second effective duration information and The first effective duration is the same or different,  The determining the effective duration corresponding to the weight is specifically: determining, according to the second valid duration information set by the indication weight, an effective duration corresponding to the weight.  15. A transmission device for weights, comprising:  a first receiving unit, configured to receive a channel test signal sent by the beamforming sender; and a testing unit, configured to test the channel to obtain a corresponding weight;  a determining unit, configured to determine a valid duration corresponding to the weight;  a storage unit, configured to save the weight in a VH compression beamforming report element of a very high throughput rate;  And a first transmission unit, configured to send the VHT compressed beamforming report element to the beamforming sender within an effective duration of the weight.  The device according to claim 15, further comprising:  a second receiving unit, configured to receive, after the first receiving unit receives the channel test signal, a channel test signal notification sent by a beamforming initiator; a first determining unit, configured to notify, according to the channel test signal, whether it is a beamforming receiver to be tested, and start the first when confirming that it is a beamforming receiver to be tested The receiving unit receives the channel test signal sent by the beamforming sender.  The device according to claim 15, further comprising:  a third receiving unit, configured to receive, by the first transmitting unit, a beamforming response request frame sent by the beamforming sender;  The second transmission unit is further configured to send, after the third receiving unit receives the beamforming response request frame sent by the beamforming sender, to the beamforming sender within the effective duration of the weight The VHT compressed beamforming report element.  The device according to claim 17, further comprising:  a second determining unit, configured to determine whether it is the first beamforming receiver specified in the channel test signal notification, and send the determination result of the yes to the first transmission unit; send the judgment result of the second to the second transmission unit.  The device according to claim 15, wherein the first transmission unit is specifically configured to: send the VHT compressed beamforming device to the beamforming sender by using a VHT compressed beamforming frame.  The device according to claim 15, wherein the determining unit comprises: a speed determining unit, configured to determine a beamforming receiver's own moving speed;  a step unit for dividing the speed according to the moving speed to obtain a speed of different speeds; a time length setting unit, configured to set a corresponding effective duration for each speed, the effective duration being controlled by a counter ;  And a counting starting unit, configured to start a counter down counting when the storage unit saves the weight in the VHT compressed beamforming report element.  The apparatus according to claim 15, wherein the determining unit comprises: a frequency shift calculating unit, configured to calculate a Doppler frequency shift according to a beamforming receiver's moving rate; a duration calculating unit, configured to The Doppler shift and channel similarity calculate the effective duration of the weight. The device according to any one of claims 15 to 21, further comprising a third determining unit, configured to determine whether the weight is valid, and if valid, and to determine the weight Transmitting the result to the first transmission unit; transmitting the determination result of invalidating the weight to the third transmission unit;  The third transmission unit is configured to send, to the beamforming sender, a VHT compressed beamforming frame that does not include the VHT compressed beamforming report element when the weight is invalid.  The device according to claim 22, wherein the third determining unit comprises: a counting determining unit, configured to determine whether the counter is zeroed, and if the counter is not zeroed, determining the right The value is valid, and the judgment result that the weight is valid is sent to the first transmission unit; otherwise, it is determined that the weight is invalid, and the judgment result that the weight is invalid is sent to the third transmission unit; and/or  a comparison judging unit, configured to compare the effective duration of the weight with the time T of calculating the weight moment to the feedback weight moment; if the time T is not greater than the effective duration of the weight, determining that the weight is valid, The judgment result that the weight is valid is sent to the first transmission unit; otherwise, it is determined that the weight is invalid, and the determination result that the weight is invalid is sent to the third transmission unit.  The device according to claim 22, wherein the device further comprises: a deleting unit, connected to the third determining unit, configured to clear the VHT compressed beamforming report after determining that the weight is invalid The weight in the element.  The device according to claim 16, wherein before the receiving, by the second receiving unit, the channel test signal sent by the beamforming initiator, the device further comprises:  a fourth receiving unit, configured to receive a media access control MAC frame sent by a beamforming initiator, where the MAC frame includes first valid duration information indicating a weight setting;  The determining unit is specifically configured to: determine, according to the first valid duration information set by the indication weight in the MAC frame, an effective duration corresponding to the weight.  The apparatus according to claim 25, wherein the MAC frame received by the fourth receiving unit comprises: a broadcast MAC frame, a multicast MAC frame, and a unicast MAC frame, where the broadcast MAC The frame is a beacon frame, and the multicast MAC frame is an NDPA frame; the unicast MAC frame is an association request frame or an association response frame. The device according to claim 25, wherein the fourth receiving unit has The medium receives the media access control MAC frame sent by the beamforming initiator by unicast, broadcast or multicast.  The device according to claim 16, wherein when the receiving end address RA field of the channel test signal received by the second receiving unit includes the second valid duration information indicating the weight setting The second valid duration information is the same as or different from the first valid duration information.  The determining unit is specifically configured to: determine, according to the second valid duration information set by the indication weight, an effective duration corresponding to the weight.