CN115174003B - Block acknowledgement control method, device, computer readable storage medium and terminal equipment - Google Patents
Block acknowledgement control method, device, computer readable storage medium and terminal equipment Download PDFInfo
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- H—ELECTRICITY
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Abstract
The present application belongs to the technical field of wireless local area network communication, and in particular, relates to a block acknowledgement control method, a device, a computer readable storage medium and a terminal device. The method comprises the following steps: calculating a first packet loss rate of a block acknowledgement frame, wherein the first packet loss rate is the packet loss rate under a conventional acknowledgement strategy; if the first packet loss rate is larger than a preset first threshold value, modifying the conventional confirmation strategy into a block confirmation strategy, and starting to send a block confirmation request frame; calculating a second packet loss rate of the block acknowledgement frame, wherein the second packet loss rate is the packet loss rate under the block acknowledgement policy; and executing a block acknowledgement control mode corresponding to the second packet loss rate and the sending rate of the block acknowledgement request frame. The application can more effectively measure the packet loss degree of the block acknowledgement frame by using the packet loss rate, and can make flexible control adjustment according to the real-time packet loss rate and the sending rate of the block acknowledgement request frame under the block acknowledgement strategy, thereby effectively relieving the possible wireless performance loss.
Description
Technical Field
The present application belongs to the technical field of wireless local area network communication, and in particular, relates to a block acknowledgement control method, a device, a computer readable storage medium and a terminal device.
Background
In wireless lan communication, packet loss and retransmission of data frames are important causes of low wireless performance. The IEEE 802.11n protocol introduces a Block Ack (BA) mechanism to acknowledge the reception status of MAC protocol data units (MAC Protocol Data Unit, MPDU) in the physical layer convergence procedure protocol data units (Physical layer convergence procedure Protocol Data Unit, PPDU). However, the frame interaction of the middle-far end communication is easily interfered by the environment, and is limited by the problems of Station (STA) transmitting power, access Point (AP) receiving sensitivity and the like, so that the condition of BA frame packet loss is easy to occur, and further, the data frame retransmission behavior is caused to generate additional air interface overhead, so that the middle-far end wireless performance is lower.
In the prior art, an AP generally determines whether a BA frame packet loss occurs according to a data frame rate represented by a PPDU modulation and coding strategy (Modulation and Coding Scheme, MCS), and when the data frame rate is low, the BA frame packet loss is considered to occur, so that a transmission rate of the BA frame can be reduced by a block acknowledgement request (Block Ack Request, BAR) mechanism, so as to reduce the occurrence of the BA frame packet loss. However, only qualitative analysis can be roughly performed on whether the BA frame packet loss occurs through the PPDU MCS, and the BA frame packet loss degree cannot be truly and effectively measured, which may cause greater radio performance loss due to the fact that the sending rate of the BA frame is reduced.
Disclosure of Invention
In view of this, the embodiments of the present application provide a block acknowledgement control method, apparatus, computer readable storage medium and terminal device, so as to solve the problem that the prior art cannot effectively measure the packet loss degree of the BA frame, and is easy to cause a larger wireless performance loss.
A first aspect of an embodiment of the present application provides a block acknowledgement control method, which may include:
calculating a first packet loss rate of a block acknowledgement frame, wherein the first packet loss rate is the packet loss rate under a conventional acknowledgement strategy;
if the first packet loss rate is larger than a preset first threshold value, modifying the conventional confirmation strategy into a block confirmation strategy, and starting to send a block confirmation request frame;
calculating a second packet loss rate of the block acknowledgement frame, wherein the second packet loss rate is the packet loss rate under the block acknowledgement policy;
and executing a block acknowledgement control mode corresponding to the second packet loss rate and the sending rate of the block acknowledgement request frame.
In a specific implementation manner of the first aspect, the performing a block acknowledgement control manner corresponding to the second packet loss rate and the sending rate of the block acknowledgement request frame may include:
and if the second packet loss rate is greater than a preset second threshold value and the sending rate of the block acknowledgement request frame is greater than a preset minimum rate, reducing the sending rate of the block acknowledgement request frame, and returning to the step of calculating the second packet loss rate of the block acknowledgement frame and the subsequent steps.
In a specific implementation manner of the first aspect, the performing a block acknowledgement control manner corresponding to the second packet loss rate and the sending rate of the block acknowledgement request frame may include:
and if the second packet loss rate is greater than a preset second threshold value and the sending rate of the block acknowledgement request frame is equal to a preset minimum rate, modifying the block acknowledgement policy into the conventional acknowledgement policy.
In a specific implementation manner of the first aspect, the performing a block acknowledgement control manner corresponding to the second packet loss rate and the sending rate of the block acknowledgement request frame may include:
if the second packet loss rate is smaller than a preset third threshold value and the sending rate of the block acknowledgement request frame is smaller than a preset highest rate, the sending rate of the block acknowledgement request frame is increased, and the step of calculating the second packet loss rate of the block acknowledgement frame and the subsequent steps are executed in a returning mode.
In a specific implementation manner of the first aspect, the performing a block acknowledgement control manner corresponding to the second packet loss rate and the sending rate of the block acknowledgement request frame may include:
and if the second packet loss rate is smaller than a preset third threshold value and the sending rate of the block acknowledgement request frame is equal to a preset highest rate, modifying the block acknowledgement strategy into the conventional acknowledgement strategy.
In a specific implementation manner of the first aspect, the performing a block acknowledgement control manner corresponding to the second packet loss rate and the sending rate of the block acknowledgement request frame may include:
if the second packet loss rate is smaller than or equal to a preset second threshold value and the second packet loss rate is larger than or equal to a preset third threshold value, maintaining the sending rate of the block acknowledgement request frame, and returning to the step of calculating the second packet loss rate of the block acknowledgement frame and the subsequent steps; the third threshold is less than the second threshold.
In a specific implementation manner of the first aspect, before modifying the conventional acknowledgement policy into the block acknowledgement policy, the method may further include:
detecting the block acknowledgement request frame with a preset first sending rate by using a preset first number of data frames;
calculating the packet loss rate of the block acknowledgement frame at the first transmission rate;
if the packet loss rate of the block acknowledgement frame at the first sending rate is greater than a preset fourth threshold value, detecting the block acknowledgement request frame with a preset second sending rate by using a preset second number of data frames; the second transmission rate is less than the first transmission rate;
Calculating a packet loss rate of the block acknowledgement frame at the second transmission rate;
and if the packet loss rate of the block acknowledgement frame at the second sending rate is smaller than the packet loss rate of the block acknowledgement frame at the first sending rate, executing the step of modifying the conventional acknowledgement policy into a block acknowledgement policy and subsequent steps.
In a specific implementation manner of the first aspect, before the detecting using the block acknowledgement request frame with the preset first transmission rate and the preset first number of data frames, the method may further include:
calculating the time difference between the current time and the starting time of the last detection process;
and if the time difference is greater than or equal to a preset detection period, executing the step of detecting by using the block acknowledgement request frame with the preset first sending rate and the following steps.
In a specific implementation manner of the first aspect, the method may further include:
if the packet loss rate of the block acknowledgement frame at the first sending rate is greater than the fourth threshold, the detection period is increased according to a preset adjustment step length;
And if the packet loss rate of the block acknowledgement frame at the first sending rate is smaller than or equal to the fourth threshold value, reducing the detection period according to the adjustment step length.
In a specific implementation manner of the first aspect, the calculating process of the packet loss rate may include:
counting a first block acknowledgement frame number and a second block acknowledgement frame number in the block acknowledgement frames within a preset time period or in a preset number, wherein the first block acknowledgement frame number is the number of the block acknowledgement frames actually received, and the second block acknowledgement frame number is the number of the block acknowledgement frames overtime;
and calculating the packet loss rate according to the first block acknowledgement frame number and the second block acknowledgement frame number.
A second aspect of an embodiment of the present application provides a block acknowledgement control device, which may include:
the first packet loss rate calculation module is used for calculating a first packet loss rate of the block acknowledgement frame, wherein the first packet loss rate is the packet loss rate under a conventional acknowledgement strategy;
the confirmation strategy modification module is used for modifying the conventional confirmation strategy into a block confirmation strategy and starting to send a block confirmation request frame if the first packet loss rate is larger than a preset first threshold value;
the second packet loss rate calculation module is used for calculating a second packet loss rate of the block acknowledgement frame, wherein the second packet loss rate is the packet loss rate under the block acknowledgement policy;
And the control mode execution module is used for executing a block acknowledgement control mode corresponding to the second packet loss rate and the sending rate of the block acknowledgement request frame.
In a specific implementation manner of the second aspect, the control manner execution module may include:
and the first control mode execution unit is used for reducing the sending rate of the block acknowledgement request frame and recalculating the second packet loss rate if the second packet loss rate is greater than a preset second threshold value and the sending rate of the block acknowledgement request frame is greater than a preset minimum rate.
In a specific implementation manner of the second aspect, the control manner execution module may include:
and the second control mode execution unit is used for modifying the block acknowledgement policy into the conventional acknowledgement policy if the second packet loss rate is greater than a preset second threshold value and the sending rate of the block acknowledgement request frame is equal to a preset minimum rate.
In a specific implementation manner of the second aspect, the control manner execution module may include:
and the third control mode execution unit is used for increasing the sending rate of the block acknowledgement request frame and recalculating the second packet loss rate if the second packet loss rate is smaller than a preset third threshold value and the sending rate of the block acknowledgement request frame is smaller than a preset highest rate.
In a specific implementation manner of the second aspect, the control manner execution module may include:
and a fourth control manner execution unit, configured to modify the block acknowledgement policy into the normal acknowledgement policy if the second packet loss rate is smaller than a preset third threshold and the sending rate of the block acknowledgement request frame is equal to a preset highest rate.
In a specific implementation manner of the second aspect, the control manner execution module may include:
a fifth control manner execution unit, configured to, if the second packet loss rate is less than or equal to a preset second threshold and the second packet loss rate is greater than or equal to a preset third threshold, maintain the sending rate of the block acknowledgement request frame, and recalculate the second packet loss rate; the third threshold is less than the second threshold.
In a specific implementation manner of the second aspect, the block acknowledgement control device may further include:
the first rate detection module is used for detecting the block acknowledgement request frame with a preset first sending rate by using a preset first number of data frames, and calculating the packet loss rate of the block acknowledgement frame at the first sending rate;
A second rate detection module, configured to detect the block acknowledgement request frame with a preset second sending rate by using a preset second number of data frames if the packet loss rate of the block acknowledgement frame at the first sending rate is greater than a preset fourth threshold, and calculate the packet loss rate of the block acknowledgement frame at the second sending rate; the second transmission rate is less than the first transmission rate.
In a specific implementation manner of the second aspect, the block acknowledgement control device may further include:
the detection period judging module is used for calculating the time difference between the current time and the starting time of the last detection process and judging whether the time difference is larger than or equal to a preset detection period.
In a specific implementation manner of the second aspect, the block acknowledgement control device may further include:
the detection period adjusting module is configured to increase the detection period according to a preset adjustment step length if the packet loss rate of the block acknowledgement frame at the first transmission rate is greater than the fourth threshold; and if the packet loss rate of the block acknowledgement frame at the first sending rate is smaller than or equal to the fourth threshold value, reducing the detection period according to the adjustment step length.
In a specific implementation manner of the second aspect, the first packet loss rate calculation module and the second packet loss rate calculation module may each include:
a number counting unit, configured to count a first block acknowledgement frame number and a second block acknowledgement frame number in a predetermined time period or in a predetermined number of the block acknowledgement frames, where the first block acknowledgement frame number is a number of the block acknowledgement frames actually received, and the second block acknowledgement frame number is a number of the block acknowledgement frames that is overtime;
and the packet loss rate calculation unit is used for calculating the packet loss rate according to the first block acknowledgement frame number and the second block acknowledgement frame number.
A third aspect of the embodiments of the present application provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of any one of the block acknowledgement control methods described above.
A fourth aspect of the embodiments of the present application provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of any one of the block acknowledgement control methods described above when executing the computer program.
A fifth aspect of the embodiments of the present application provides a computer program product for, when run on a terminal device, causing the terminal device to perform the steps of any of the block acknowledgement control methods described above.
Compared with the prior art, the embodiment of the application has the beneficial effects that: the embodiment of the application introduces the concept of the BA packet loss rate, and can more effectively measure the BA frame packet loss degree than the PPDU MCS. When the packet loss rate of the BA frame is high, the BAR mechanism is started to be started, but in the implementation process of the BAR mechanism, the transmission rate of the BA frame is not simply reduced, but a corresponding control mode is selected according to the real-time packet loss rate and the transmission rate of the BAR frame, so that flexible control adjustment can be made according to actual conditions, and the possible wireless performance loss is effectively relieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of BA frame packet loss;
fig. 2 is a schematic diagram of one countermeasure taken by the STA;
FIG. 3 is a schematic diagram of one countermeasure taken by an AP;
fig. 4 is a schematic diagram of BA frame packet loss occurring under a conventional acknowledgement policy;
fig. 5 is a schematic diagram of BA frame packet loss occurring under the Block Ack policy;
FIG. 6 is a flow chart of an embodiment of a block acknowledgment control method in accordance with an embodiment of the present application;
FIG. 7 is a block acknowledgement control method according to an embodiment of the present application;
FIG. 8 is a schematic flow chart of an attempted probe by taking out a BAR frame with a small number of data frames;
FIG. 9 is a block diagram illustrating an embodiment of a block acknowledgment control apparatus according to an embodiment of the present application;
fig. 10 is a schematic block diagram of a terminal device in an embodiment of the present application.
Detailed Description
In order to make the objects, features and advantages of the present application more comprehensible, the technical solutions in the embodiments of the present application are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in this specification and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
In addition, in the description of the present application, the terms "first," "second," "third," etc. are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Fig. 1 is a schematic diagram of BA frame packet loss, where an AP sends a PPDU data frame to an STA, and the STA feeds back a BA frame to the AP after receiving the data frame, but the AP may not successfully receive the BA frame, i.e. BA frame packet loss occurs. At this time, the AP may retransmit the data frame until receiving the BA frame fed back by the STA. In this process, the same data frame is repeatedly transmitted, so that the waste of wireless air interface resources is caused, and the wireless performance is lower.
In order to solve this problem, different countermeasures can be taken from the viewpoint of the STA side and the AP side, respectively.
Fig. 2 is a schematic diagram of a countermeasure taken by an STA, where the STA may determine whether a BA frame packet loss occurs through a data frame rate represented by a PPDU MCS, and when the data frame rate is low, consider that the BA frame packet loss occurs, and reduce the BA frame packet loss by self-reducing the BA frame rate to improve the anti-interference capability of the BA frame, so as to reduce the occurrence of the BA frame packet loss.
Fig. 3 is a schematic diagram of a countermeasure taken by an AP, where the AP may determine whether a BA frame packet loss occurs by using a data frame rate represented by a PPDU MCS, and when the data frame rate is low, consider that the BA frame packet loss occurs, directly set an acknowledgement policy (Ack policy) in a quality of service Control (QoS Control) field to be a Block Ack, and utilize the BAR mechanism characteristic provided by the 802.11 protocol, that is, the characteristic that the AP transmits a BAR frame with a specific rate, the STA must reply to the BA frame with a specific rate, and bring out the BAR frame with the lowest rate to allow the STA to reply with the BA frame with the lowest rate, so as to reduce the occurrence of the BA frame packet loss.
In the countermeasures shown in fig. 2 and 3, the degree of packet loss of the BA frame cannot be truly and effectively measured, and conversely, a larger wireless performance loss may be caused by a decrease in the transmission rate of the BA frame. When the BA frame packet loss occurs less in the far-end wireless communication, the STA actively reduces the BA frame rate, and the wireless performance is theoretically lost by about 3%; if the AP actively transmits the BAR frame with the lowest rate to cause the STA to reduce the BA frame rate, the wireless performance would be theoretically lost by 6.6%, and the manner of directly carrying out the BAR frame may also cause that some STAs cannot cope with the communication change carrying out the BAR frame, resulting in the rapid degradation of the wireless performance.
In the embodiment of the application, the concept of the BA packet loss rate can be introduced to measure the degree of BA frame packet loss. And counting the first BA frame number and the second BA frame number in the preset time length or the preset number of block acknowledgement frames, and calculating the packet loss rate of the BA frames according to the first BA frame number and the second BA frame number. The first BA frame number is the number of BA frames actually received by the AP, and the second BA frame number is the number of BA frames overtime.
The calculation formula of the BA packet loss rate may be:
wherein BA is success For the first BA frame number, BA timeout For the second BA frame number, ba_per is the BA packet loss rate.
It should be noted that the BA packet loss rate has different meanings in the following two different Ack policy cases:
first category: under the Normal acknowledgement (Normal Ack) policy, ack policy in the QoS Control field is set to Normal Ack, and the STA replies to the BA frame immediately after receiving the data frame, which is the setting adopted in most wireless data communication interactions at present. As shown in fig. 4, when the AP does not receive the BA frame replied by the STA (fig. 4, upper diagram), or the STA does not transmit the BA frame because it does not receive the data frame transmitted by the AP (fig. 4, lower diagram), it is calculated that the reception of the BA frame is timed out for the AP and cannot be distinguished. Because the situation that the STA receives the data frame poorly is common in the middle and long distances, even if the calculation result of the BA packet loss rate is large, most of the situation is likely to be caused by the fact that the STA receives the data frame poorly, the statistical BA packet loss rate reflects the fact that the AP receives the BA frame not effectively, and can still be used for measuring the situation that the BA frame packet loss possibly occurs in the current scene.
The second category: under the Block Ack policy, the Ack policy in the QoS Control field is set to Block Ack, followed by the carry-over of the BAR frame. The STA replies to the BA frame after receiving the BAR frame, whether or not it receives the data frame. As shown in fig. 5, when the AP does not receive the BA frame replied by the STA (fig. 5 upper diagram), or the STA does not transmit the BA frame because it does not receive the BAR frame transmitted by the AP (fig. 5 lower diagram), it is counted as a timeout of receiving the BA frame for the AP. Although the AP still cannot determine whether the STA transmits the BA frame, in comparison with the first case, the BAR frame is used as the control frame, the modulation specification of the BAR frame is far lower than that of the data frame, the wireless transmission power of the AP is higher than that of the STA, and it can be considered that the situation that the STA cannot receive the BAR frame is basically not higher than that of the AP cannot receive the BA frame, at this time, the counted BA packet loss rate can effectively reflect the situation that the AP itself receives the BA frame, and when the calculation result of the BA packet loss rate is large, it means that a serious BA packet loss situation occurs.
Based on the concept of the BA packet loss rate, the embodiment of the present application proposes a block acknowledgement control method, where the execution body may be an AP. One embodiment of the method may include a process as shown in fig. 6:
step S601, calculating a first packet loss rate of the BA frame.
The first packet loss rate is a packet loss rate under a Normal Ack policy. In the initial state, ack policy in the QoS Control field is set to Normal Ack by default.
If the first packet loss rate is greater than the preset first threshold, the BA frame packet loss degree is considered to be serious, and step S602 and subsequent steps are executed at this time; if the first packet loss rate is less than or equal to the first threshold, the BA frame packet loss degree is considered to be slight, and the Normal Ack policy is still kept unchanged, and the step S601 and subsequent steps are executed. The specific value of the first threshold may be set according to practical situations, which is not specifically limited in the embodiment of the present application.
Step S602, modifying the Normal Ack policy into a Block Ack policy, and starting to send the BAR frame.
Specifically, the AP may modify Ack policy in the QoS Control field from Normal Ack to Block Ack and start transmitting BAR frames after one short inter-frame space (Short interframe space, SIFS). The transmission rate of the BAR frame is consistent with the rate of the BA frame received before the AP.
After the BAR frame is taken out by the AP, some STAs may not be able to cope with the communication change of the BAR frame, and reply to a large number of BA frames with Bitmap (Bitmap) of 0 even though the data frame is received, i.e., inform the AP that it has not received the data frame, thereby causing the wireless performance to deteriorate drastically. In this case, the AP may restore the STA to the default Normal Ack policy by using the STA as an abnormal terminal without applying the Block Ack policy thereto.
Step S603, calculating a second packet loss rate of the BA frame.
The second packet loss rate is the packet loss rate under the Block Ack policy.
Step S604, a block acknowledgement control scheme corresponding to the second packet loss rate and the transmission rate of the BAR frame is executed.
Specifically, as shown in fig. 7, if the second packet loss rate is greater than the second threshold and the sending rate of the BAR frame is greater than the preset minimum rate, it is indicated that in the current communication environment, packet loss is likely to occur when the AP receives the BA frame with the current rate, and at this time, the sending rate of the BAR frame may be reduced, so as to reduce the occurrence of packet loss of the BA frame. After the transmission rate of the BAR frame is reduced, the execution of step S603 and the subsequent steps may be returned. The specific value of the second threshold may be set according to the actual situation, which is not specifically limited in the embodiment of the present application. The specific value of the minimum rate may be set according to the actual situation, which is not specifically limited in the embodiment of the present application.
If the second packet loss rate is greater than the second threshold and the sending rate of the BAR frame is equal to the minimum rate, it is indicated that in the current communication environment, the AP still easily loses packets even if receiving the BA frame with the minimum rate, i.e. the Block Ack policy does not bring about improvement of the BA packet loss rate, but may cause greater wireless performance loss, at this time, the Block Ack policy may be revised to the Normal Ack policy, i.e. the Ack policy in the QoS Control field is revised from the Block Ack to the Normal Ack, so as to reduce unnecessary wireless performance loss brought by the Block Ack policy.
If the second packet loss rate is smaller than the preset third threshold and the sending rate of the BAR frame is smaller than the preset highest rate, the AP indicates that the condition of receiving the BA frame with the current rate is good in the current communication environment, and at this time, the sending rate of the BAR frame can be increased, and the step S603 and the subsequent steps are executed again. The specific value of the third threshold is smaller than the second threshold, which can be set according to actual situations, and the embodiment of the application does not limit the specific value. The maximum rate is greater than the minimum rate, and the specific value of the maximum rate can be set according to practical situations, which is not particularly limited by the embodiment of the application.
If the second packet loss rate is smaller than the third threshold and the sending rate of the BAR frame is equal to the preset highest rate, the AP is good even if receiving the highest rate BA frame in the current communication environment, and at this time, the Block Ack policy may be modified to the Normal Ack policy again, so as to reduce unnecessary wireless performance loss caused by the Block Ack policy.
If the second packet loss rate is less than or equal to the second threshold and the second packet loss rate is greater than or equal to the third threshold, it is indicated that the packet loss condition of the BA frame received by the AP at the current rate is still within the acceptable range in the current communication environment, and at this time, the sending rate of the BAR frame may be maintained, and step S603 and subsequent steps are executed back.
In another specific implementation manner of the embodiment of the present application, when the first packet loss rate is greater than the first threshold, the trial detection may be performed by taking out the BAR frame with a small amount of data frames, so as to reduce the adverse effect that the direct taking out of the BAR frame with a large amount may bring about the overall wireless performance. I.e. prior to step S602, the detection process as shown in fig. 8 may also be included:
step S801, detecting using a BAR frame with a preset first transmission rate from a preset first number of data frames.
The first number may be set according to practical situations, for example, may be set to 5 or other values, which is not specifically limited in the embodiment of the present application. The first transmission rate may be set according to practical situations, for example, may be set to 24Mbps or other values, which is not specifically limited in the embodiment of the present application.
The data frames sent by the AP in the probing process may be data frames that are not aggregated, and at this time, the STA may feed back a corresponding BA frame to each data frame separately, so that the AP may receive as many BA frames as possible to perform BA packet loss rate calculation when sending a small number of data frames.
Step S802, calculating the BA packet loss rate at the first sending rate.
If the BA packet loss rate at the first transmission rate is greater than the preset fourth threshold, executing step S803 and the subsequent steps; if the BA packet loss rate at the first sending rate is less than or equal to the fourth threshold, the step S601 and the subsequent steps are continued, i.e. the Normal Ack policy is still kept unchanged. The specific value of the fourth threshold may be set according to the actual situation, which is not specifically limited in the embodiment of the present application.
Step S803, detecting using the BAR frame with the preset second transmission rate from the preset second number of data frames.
The second number may be set according to the actual situation, and the value of the second number may be identical to the first number or may not be identical to the first number, for example, the second number may be set to 5 or other values, which is not specifically limited in the embodiment of the present application. The second transmission rate is smaller than the first transmission rate, and a specific value thereof may be set according to practical situations, for example, may be set to 6Mbps or other values, which is not specifically limited in the embodiment of the present application.
Step S804, calculating the BA packet loss rate at the second sending rate.
If the BA packet loss rate at the second transmission rate is smaller than the BA packet loss rate at the first transmission rate, the step S602 and the subsequent steps are continuously executed, i.e. the Normal Ack policy is modified to be the Block Ack policy, and if the BA packet loss rate at the second transmission rate is greater than or equal to the BA packet loss rate at the first transmission rate, the step S601 and the subsequent steps are executed again, i.e. the Normal Ack policy is still kept unchanged.
Through the detection process, the BAR frame can be carried out with a small amount of data frames for trial detection, and whether strategy modification is carried out is determined according to the detection result, so that adverse effects possibly caused by carrying out the BAR frame directly with a large amount of data frames on the whole wireless performance can be effectively reduced.
In the above manner, when the first packet loss rate calculated in step S601 is greater than the first threshold, the AP starts the probing process, and when the BA packet loss rate calculated in step S802 at the first transmission rate is less than or equal to the fourth threshold, the AP returns to execute step S601 again, which may cause too frequent probing process. In order to avoid this, in another specific implementation manner of the embodiment of the present application, a detection period may be preset, and the time interval between two adjacent detection processes needs to be greater than the detection period. Specifically, before executing step S801, a time difference between the current time and the start time of the last detection process may be calculated first, if the time difference is smaller than the detection period, waiting is continued, and if the time difference is greater than or equal to the detection period, step S801 and subsequent steps are executed. The specific value of the detection period may be set according to the actual situation, for example, may be set to 100ms or other values, which is not specifically limited in the embodiment of the present application.
The value of the detection period can be kept unchanged in the whole control process, and can be dynamically adjusted according to actual conditions. In the case of dynamic adjustment, the preset value is taken as the initial value of the detection period, after step S802 is executed, if the BA packet loss rate at the first transmission rate is greater than the fourth threshold, the detection period may be increased according to the preset adjustment step, and if the BA packet loss rate at the first transmission rate is less than or equal to the fourth threshold, the detection period may be decreased according to the adjustment step. The specific value of the adjustment step length may be set according to the actual situation, for example, may be set to 100ms or other values, which is not specifically limited in the embodiment of the present application. In the course of the dynamic adjustment of the detection period, its adjustment range may be limited, for example, it may be limited to [ T ] min ，T max ]Within (1), where T min For the preset minimum detection period, the specific value of the detection period can be set according to practical situations, for example, the detection period can be set to be 100ms or other values, the embodiment of the application is not particularly limited, and T is not particularly limited max For the preset maximum detection period, the specific value thereof may be set according to practical situations, for example, may be set to 400ms or other values, which is not limited in the embodiment of the present application.
In summary, the application embodiment introduces the concept of the BA packet loss rate, and can measure the BA frame packet loss degree more effectively than the PPDU MCS. When the packet loss rate of the BA frame is high, the BAR mechanism is started to be started, but in the implementation process of the BAR mechanism, the transmission rate of the BA frame is not simply reduced, but a corresponding control mode is selected according to the real-time packet loss rate and the transmission rate of the BAR frame, so that flexible control adjustment can be made according to actual conditions, and the possible wireless performance loss is effectively relieved.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
Fig. 9 shows a block acknowledgement control apparatus according to an embodiment of the present application, corresponding to a block acknowledgement control method described in the above embodiment.
In this embodiment, a block acknowledgement control device may include:
the first packet loss rate calculation module 901 is configured to calculate a first packet loss rate of a block acknowledgement frame, where the first packet loss rate is a packet loss rate under a conventional acknowledgement policy;
a confirmation policy modification module 902, configured to modify the conventional confirmation policy into a block confirmation policy and start sending a block confirmation request frame if the first packet loss rate is greater than a preset first threshold;
a second packet loss rate calculation module 903, configured to calculate a second packet loss rate of the block acknowledgement frame, where the second packet loss rate is a packet loss rate under the block acknowledgement policy;
a control manner execution module 904, configured to execute a block acknowledgement control manner corresponding to the second packet loss rate and the sending rate of the block acknowledgement request frame.
In a specific implementation manner of the embodiment of the present application, the control manner execution module may include:
and the first control mode execution unit is used for reducing the sending rate of the block acknowledgement request frame and recalculating the second packet loss rate if the second packet loss rate is greater than a preset second threshold value and the sending rate of the block acknowledgement request frame is greater than a preset minimum rate.
In a specific implementation manner of the embodiment of the present application, the control manner execution module may include:
and the second control mode execution unit is used for modifying the block acknowledgement policy into the conventional acknowledgement policy if the second packet loss rate is greater than a preset second threshold value and the sending rate of the block acknowledgement request frame is equal to a preset minimum rate.
In a specific implementation manner of the embodiment of the present application, the control manner execution module may include:
and the third control mode execution unit is used for increasing the sending rate of the block acknowledgement request frame and recalculating the second packet loss rate if the second packet loss rate is smaller than a preset third threshold value and the sending rate of the block acknowledgement request frame is smaller than a preset highest rate.
In a specific implementation manner of the embodiment of the present application, the control manner execution module may include:
and a fourth control manner execution unit, configured to modify the block acknowledgement policy into the normal acknowledgement policy if the second packet loss rate is smaller than a preset third threshold and the sending rate of the block acknowledgement request frame is equal to a preset highest rate.
In a specific implementation manner of the embodiment of the present application, the control manner execution module may include:
A fifth control manner execution unit, configured to, if the second packet loss rate is less than or equal to a preset second threshold and the second packet loss rate is greater than or equal to a preset third threshold, maintain the sending rate of the block acknowledgement request frame, and recalculate the second packet loss rate; the third threshold is less than the second threshold.
In a specific implementation manner of the embodiment of the present application, the block acknowledgement control device may further include:
the first rate detection module is used for detecting the block acknowledgement request frame with a preset first sending rate by using a preset first number of data frames, and calculating the packet loss rate of the block acknowledgement frame at the first sending rate;
a second rate detection module, configured to detect the block acknowledgement request frame with a preset second sending rate by using a preset second number of data frames if the packet loss rate of the block acknowledgement frame at the first sending rate is greater than a preset fourth threshold, and calculate the packet loss rate of the block acknowledgement frame at the second sending rate; the second transmission rate is less than the first transmission rate.
In a specific implementation manner of the embodiment of the present application, the block acknowledgement control device may further include:
The detection period judging module is used for calculating the time difference between the current time and the starting time of the last detection process and judging whether the time difference is larger than or equal to a preset detection period.
In a specific implementation manner of the embodiment of the present application, the block acknowledgement control device may further include:
the detection period adjusting module is configured to increase the detection period according to a preset adjustment step length if the packet loss rate of the block acknowledgement frame at the first transmission rate is greater than the fourth threshold; and if the packet loss rate of the block acknowledgement frame at the first sending rate is smaller than or equal to the fourth threshold value, reducing the detection period according to the adjustment step length.
In a specific implementation manner of the embodiment of the present application, the first packet loss rate calculation module and the second packet loss rate calculation module may each include:
a number counting unit, configured to count a first block acknowledgement frame number and a second block acknowledgement frame number in a predetermined time period or in a predetermined number of the block acknowledgement frames, where the first block acknowledgement frame number is a number of the block acknowledgement frames actually received, and the second block acknowledgement frame number is a number of the block acknowledgement frames that is overtime;
And the packet loss rate calculation unit is used for calculating the packet loss rate according to the first block acknowledgement frame number and the second block acknowledgement frame number.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described apparatus, modules and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Fig. 10 shows a schematic block diagram of a terminal device according to an embodiment of the present application, and for convenience of explanation, only a portion related to the embodiment of the present application is shown.
As shown in fig. 10, the terminal device 10 of this embodiment includes: a processor 100, a memory 101 and a computer program 102 stored in the memory 101 and executable on the processor 100. The processor 100 implements the steps of the above-described respective block acknowledgement control method embodiments when executing the computer program 102, for example, steps S601 to S604 shown in fig. 6. Alternatively, the processor 100 may implement the functions of the modules/units in the above-described device embodiments when executing the computer program 102, for example, the functions of the modules 901 to 904 shown in fig. 9.
Illustratively, the computer program 102 may be partitioned into one or more modules/units that are stored in the memory 101 and executed by the processor 100 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program 102 in the terminal device 10.
The terminal device 10 may be various types of APs. It will be appreciated by those skilled in the art that fig. 10 is merely an example of the terminal device 10 and is not limiting of the terminal device 10, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the terminal device 10 may further include input-output devices, network access devices, buses, etc.
The processor 100 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 101 may be an internal storage unit of the terminal device 10, such as a hard disk or a memory of the terminal device 10. The memory 101 may also be an external storage device of the terminal device 10, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the terminal device 10. Further, the memory 101 may also include both an internal storage unit and an external storage device of the terminal device 10. The memory 101 is used for storing the computer program as well as other programs and data required by the terminal device 10. The memory 101 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the apparatus/terminal device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable storage medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable storage medium may include content that is subject to appropriate increases and decreases as required by jurisdictions and by jurisdictions in which such computer readable storage medium does not include electrical carrier signals and telecommunications signals.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (13)
1. A block acknowledgment control method, comprising:
calculating a first packet loss rate of a block acknowledgement frame, wherein the first packet loss rate is the packet loss rate under a conventional acknowledgement strategy;
if the first packet loss rate is larger than a preset first threshold value, modifying the conventional confirmation strategy into a block confirmation strategy, and starting to send a block confirmation request frame;
calculating a second packet loss rate of the block acknowledgement frame, wherein the second packet loss rate is the packet loss rate under the block acknowledgement policy;
executing a block acknowledgement control mode corresponding to the second packet loss rate and the sending rate of the block acknowledgement request frame; the block acknowledgement control manner comprises adjusting the sending rate of the block acknowledgement request frame or modifying the block acknowledgement policy to the regular acknowledgement policy.
2. The block acknowledgement control method according to claim 1, wherein the performing a block acknowledgement control method corresponding to the second packet loss rate and the transmission rate of the block acknowledgement request frame includes:
and if the second packet loss rate is greater than a preset second threshold value and the sending rate of the block acknowledgement request frame is greater than a preset minimum rate, reducing the sending rate of the block acknowledgement request frame, and returning to the step of calculating the second packet loss rate of the block acknowledgement frame and the subsequent steps.
3. The block acknowledgement control method according to claim 1, wherein the performing a block acknowledgement control method corresponding to the second packet loss rate and the transmission rate of the block acknowledgement request frame includes:
and if the second packet loss rate is greater than a preset second threshold value and the sending rate of the block acknowledgement request frame is equal to a preset minimum rate, modifying the block acknowledgement policy into the conventional acknowledgement policy.
4. The block acknowledgement control method according to claim 1, wherein the performing a block acknowledgement control method corresponding to the second packet loss rate and the transmission rate of the block acknowledgement request frame includes:
If the second packet loss rate is smaller than a preset third threshold value and the sending rate of the block acknowledgement request frame is smaller than a preset highest rate, the sending rate of the block acknowledgement request frame is increased, and the step of calculating the second packet loss rate of the block acknowledgement frame and the subsequent steps are executed in a returning mode.
5. The block acknowledgement control method according to claim 1, wherein the performing a block acknowledgement control method corresponding to the second packet loss rate and the transmission rate of the block acknowledgement request frame includes:
and if the second packet loss rate is smaller than a preset third threshold value and the sending rate of the block acknowledgement request frame is equal to a preset highest rate, modifying the block acknowledgement strategy into the conventional acknowledgement strategy.
6. The block acknowledgement control method according to claim 1, wherein the performing a block acknowledgement control method corresponding to the second packet loss rate and the transmission rate of the block acknowledgement request frame includes:
if the second packet loss rate is smaller than or equal to a preset second threshold value and the second packet loss rate is larger than or equal to a preset third threshold value, maintaining the sending rate of the block acknowledgement request frame, and returning to the step of calculating the second packet loss rate of the block acknowledgement frame and the subsequent steps; the third threshold is less than the second threshold.
7. The block acknowledgement control method according to claim 1, characterized by further comprising, before modifying the regular acknowledgement policy to a block acknowledgement policy:
detecting the block acknowledgement request frame with a preset first sending rate by using a preset first number of data frames;
calculating the packet loss rate of the block acknowledgement frame at the first transmission rate;
if the packet loss rate of the block acknowledgement frame at the first sending rate is greater than a preset fourth threshold value, detecting the block acknowledgement request frame with a preset second sending rate by using a preset second number of data frames; the second transmission rate is less than the first transmission rate;
calculating a packet loss rate of the block acknowledgement frame at the second transmission rate;
and if the packet loss rate of the block acknowledgement frame at the second sending rate is smaller than the packet loss rate of the block acknowledgement frame at the first sending rate, executing the step of modifying the conventional acknowledgement policy into a block acknowledgement policy and subsequent steps.
8. The block acknowledgment control method of claim 7 further comprising, prior to detecting the block acknowledgment request frame with a preset first transmission rate using a preset first number of data frames:
Calculating the time difference between the current time and the starting time of the last detection process;
and if the time difference is greater than or equal to a preset detection period, executing the step of detecting by using the block acknowledgement request frame with the preset first sending rate and the following steps.
9. The block acknowledgment control method of claim 8 further comprising:
if the packet loss rate of the block acknowledgement frame at the first sending rate is greater than the fourth threshold, the detection period is increased according to a preset adjustment step length;
and if the packet loss rate of the block acknowledgement frame at the first sending rate is smaller than or equal to the fourth threshold value, reducing the detection period according to the adjustment step length.
10. The block acknowledgement control method according to any one of claims 1 to 9, characterized in that the calculation process of the packet loss rate includes:
counting a first block acknowledgement frame number and a second block acknowledgement frame number in the block acknowledgement frames within a preset time period or in a preset number, wherein the first block acknowledgement frame number is the number of the block acknowledgement frames actually received, and the second block acknowledgement frame number is the number of the block acknowledgement frames overtime;
And calculating the packet loss rate according to the first block acknowledgement frame number and the second block acknowledgement frame number.
11. A block acknowledgement control device, comprising:
the first packet loss rate calculation module is used for calculating a first packet loss rate of the block acknowledgement frame, wherein the first packet loss rate is the packet loss rate under a conventional acknowledgement strategy;
the confirmation strategy modification module is used for modifying the conventional confirmation strategy into a block confirmation strategy and starting to send a block confirmation request frame if the first packet loss rate is larger than a preset first threshold value;
the second packet loss rate calculation module is used for calculating a second packet loss rate of the block acknowledgement frame, wherein the second packet loss rate is the packet loss rate under the block acknowledgement policy;
a control mode execution module, configured to execute a block acknowledgement control mode corresponding to the second packet loss rate and the sending rate of the block acknowledgement request frame; the block acknowledgement control manner comprises adjusting the sending rate of the block acknowledgement request frame or modifying the block acknowledgement policy to the regular acknowledgement policy.
12. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the block acknowledgement control method according to any of claims 1 to 10.
13. Terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the block acknowledgement control method according to any of claims 1 to 10 when executing the computer program.
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