CN116671169A

CN116671169A - Communication device and communication method applied to wireless local area network WLAN

Info

Publication number: CN116671169A
Application number: CN202180088616.7A
Authority: CN
Inventors: 梁伟; 张一凡; 徐晓妮; 罗柳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-01-30
Filing date: 2021-01-30
Publication date: 2023-08-29
Also published as: WO2022160311A1

Abstract

The embodiment of the application provides a communication device and a communication method applied to a Wireless Local Area Network (WLAN), which are used for reducing the transmission cut-off risk at a PHY layer and improving the throughput rate of a WLAN system. In the method, a communication device generates a first medium access control layer protocol data unit MPDU and a second MPDU; processing the first MPDU to generate a first physical layer protocol data unit (PPDU); counting the transmitted data quantity in the processing process corresponding to the first MPDU according to the first PPDU; selectively generating invalid data according to the amount of transmitted data, and padding the invalid data between the first MPDU and the second MPDU; and processing the invalid data and the second MPDU to generate a second PPDU.

Description

Communication device and communication method applied to wireless local area network WLAN

Technical Field

The present application relates to the field of Wireless Local Area Network (WLAN) technologies, and in particular, to a communication device and a communication method applied to a WLAN.

Background

A wireless local area network (wireless local area network, WLAN) is a network system that uses radio frequency technology for data transmission over the air. In WLAN communication, after data in a transmitting end is processed by a medium access control (medium access control, MAC) layer, the processed data is further encapsulated in a physical layer (PHY) and transmitted to the outside.

Currently, as the transmission rate of WLAN is continuously increased. For example, in the 802.11ax protocol, the PHY layer transmission rate of the WLAN reaches 9.8 gigabits per second (Gbps), which also places very high demands on the MAC layer transmission capability of the WLAN. The MAC layer must output high traffic data without interruption to ensure that the PHY layer is not down.

However, due to congestion of the data bus, congestion of access of the storage device, and the like, fluctuation of the input end flow of the MAC layer is easily caused, and thus PHY layer data is blocked, so that the throughput rate of the WLAN system is reduced. Therefore, how to reduce the risk of transmission interruption at the PHY layer in the data transmission process of WLAN is a technical problem to be solved.

Disclosure of Invention

The embodiment of the application provides a communication device and a communication method applied to a Wireless Local Area Network (WLAN), which are used for reducing the transmission cut-off risk at a PHY layer and improving the throughput rate of a WLAN system.

A first aspect of the present application provides a communication apparatus applied to a WLAN, where the communication apparatus (or referred to as WLAN device) may be a controller, an Access Point (AP) device, a remote radio unit (remote radio unit, RRU), a terminal device, or a component (such as a chip or a chip system) in the foregoing device in a WLAN communication system. The communication device includes: a medium access control layer protocol data unit MPDU generating circuit configured to generate a first MPDU and a second MPDU; the processing circuit is used for processing the first MPDU and generating a first physical layer protocol data unit (PPDU); a statistics circuit, configured to count, according to the first PPDU, an amount of transmitted data in a processing procedure corresponding to the first MPDU; the processing circuit is further configured to selectively generate invalid data according to the transmitted data amount, where the invalid data is used to indicate that the first MPDU and the second MPDU are continuous data, and fill the invalid data between the first MPDU and the second MPDU; the processing circuit is further configured to process the invalid data and the second MPDU to generate a second PPDU. The processing unit in the communication device selectively generates invalid data according to the transmitted data amount in the processing process corresponding to the processed first MPDU, and fills the invalid data between the first MPDU and the second MPDU, wherein the invalid data is used for indicating that the first MPDU and the second MPDU are continuous data; further, the processing unit in the communication device obtains the second PPDU according to the invalid data and the second MPDU, that is, when the generating time interval between the second MPDU and the first MPDU is too long due to congestion of the data bus, congestion of access of the storage device, and the like, continuity of the data stream of the PPDU located in the PHY is ensured, the transmission cut-off risk at the PHY layer is reduced, and the throughput rate of the WLAN system is improved.

In a possible implementation manner of the first aspect of the embodiment of the present application, the statistical circuit is specifically configured to: timing a processing process corresponding to the first MPDU to obtain a first duration; determining the amount of data to be sent in the processing process corresponding to the first MPDU according to the first time length; the processing circuit is specifically used for: the invalid data is selectively generated based on the amount of the transmitted data and the amount of the transmitted data.

Based on the above technical solution, the processing circuit may selectively generate the invalid data based on the amount of the transmitted data and the amount of the transmitted data determined by the statistical circuit, and specifically may be selected according to a mathematical relationship between the amount of the transmitted data and the amount of the transmitted data, for example, may be selected according to a comparison result of a ratio between the two and a threshold value, may be selected according to a comparison result of a difference between the two and the threshold value, or may be selected according to other comparison results.

In a possible implementation manner of the first aspect of the embodiment of the present application, the processing circuit is specifically configured to: and generating the invalid data when the difference value between the transmitted data quantity and the first data quantity is larger than a first threshold.

Optionally, when the difference between the amount of the outgoing data and the first amount of data is less than a first threshold, the processing circuit determines that there is no transmission interruption, i.e., the processing circuit does not generate invalid data.

Optionally, when the difference between the amount of the reply data and the first amount of data is equal to a first threshold, the processing circuit determines that there is a transmission outage, and at this time, the processing circuit generates invalid data; alternatively, the processing circuit determines that there is no transmission interruption when the difference between the amount of the transmitted data and the first amount of data is equal to a first threshold, at which time the processing circuit generates invalid data.

Optionally, the processing circuit may obtain the first threshold in a preconfigured manner, and begin to determine the first threshold by receiving an indication of other devices, or determine the first threshold in response to an operation instruction of a user, which is not limited herein.

Based on the above technical solution, the processing circuit determines whether a judging basis of transmission interruption exists, and may be a magnitude relation between a difference value between the amount of the transmitted data and the amount of the actual data and the first threshold. Wherein when the difference is greater than a first threshold, it may be determined that there is a higher risk of transmission interruption, i.e., the processing unit determines that there is a transmission interruption between the first MPDU and the second MPDU and generates invalid data, and removes the transmission interruption by filling the invalid data.

Optionally, the basis for selectively determining whether to generate the invalid data may further include one or more of a transmission duration of the first MPDU, a response duration of the first MPDU, an amount of data not transmitted by the second MPDU, and the like.

In a possible implementation manner of the first aspect of the embodiment of the present application, the data amount of the invalid data is not greater than the first threshold.

Based on the technical scheme, on the premise that the data volume of invalid data between the first MPDU and the second MPDU is not larger than the first threshold, redundant invalid data is avoided and the throughput rate is improved on the premise that the continuity of the data stream of the PPDU positioned at the PHY is ensured.

In a possible implementation manner of the first aspect of the embodiment of the present application, the data amount of the invalid data is equal to the first threshold.

Based on the above technical solution, the amount of invalid data between the first MPDU and the second MPDU is equal to the first threshold, so as to ensure continuity of the data stream of the PPDU located at the PHY.

In a possible implementation manner of the first aspect of the embodiment of the present application, the first MPDU includes a first identifier, and the statistics circuit is specifically configured to: and determining the amount of the data to be sent according to the first duration and the transmission parameters corresponding to the first identifier, wherein the transmission parameters comprise a user modulation mode, bandwidth and/or stream number.

Based on the above technical solution, in the statistical circuit, the determining basis of the amount of data to be transmitted of the first MPDU may include a first duration and a transmission parameter corresponding to the first identifier, that is, determining the amount of data to be transmitted according to the related transmission parameter of the first MPDU provides a specific implementation manner of determining the amount of data to be transmitted.

Alternatively, the statistics circuit may determine the amount of data to be sent by other means, such as estimating the amount of data by historical transmission, or by other means, which is not limited herein.

In a possible implementation manner of the first aspect of the embodiment of the present application, the invalid data includes at least one delimiter.

Based on the above technical solution, the invalid data may be implemented by at least one relimeter, where the relimeter is a kind of MAC data allowed by the WLAN protocol and not carrying valid information.

Alternatively, the invalid data may be implemented in other forms, such as filling a plurality of bit bits having a value of 0.

In a possible implementation manner of the first aspect of the embodiment of the present application, the symbol length of the at least one delimiter is 0.

Based on the above technical solution, the length field of the delimiter between the first portion of the PPDU and the second portion of the PPDU has a value of 0, so as to avoid generating excessive buffering.

In a possible implementation manner of the first aspect of the embodiment of the present application, the format of the first PPDU preamble is a high throughput HT, a very high throughput VHT and/or a high efficiency HE; and/or the number of the groups of groups,

the format of the second PPDU preamble is high throughput HT, very high throughput VHT, and/or high efficiency HE.

Based on the above technical solution, the format of the first PPDU and/or the second PPDU preamble may specifically be High Throughput (HT), very high throughput (very high throughput, VHT) and/or High Efficiency (HE), so as to reduce PHY outage risk in a corresponding transmission scenario.

In one possible implementation manner of the first aspect of the embodiment of the present application, the first MPDU and the second MPDU are included in an aggregated medium access control layer protocol data unit a-MPDU.

Based on the above technical solution, the first MPDU and the second MPDU may be different parts in the a-MPDU, so that the solution may be applied to a scenario in which the MPDU is an aggregated medium access control layer protocol data unit a-MPDU.

Alternatively, the first MPDU and the second MPDU may be MPDUs that are independent of each other, i.e. both are not included in the same a-MPDU.

A second aspect of the embodiments of the present application provides a communication method applied to a wireless local area network WLAN, where the method may be applied to a communication apparatus (or referred to as a WLAN device) and may also be applied to component execution (e.g., a processor, a chip, or a chip system, etc.) of the communication apparatus, and where a first medium access control layer protocol data unit MPDU and a second MPDU are generated; processing the first MPDU to generate a first physical layer protocol data unit (PPDU); counting the transmitted data quantity in the processing process corresponding to the first MPDU according to the first PPDU; selectively generating invalid data according to the amount of transmitted data, and padding the invalid data between the first MPDU and the second MPDU; and processing the invalid data and the second MPDU to generate a second PPDU. The communication device selectively generates invalid data according to the sent data amount in the processing process corresponding to the processed first MPDU, fills the invalid data between the first MPDU and the second MPDU, and the invalid data is used for indicating that the first MPDU and the second MPDU are continuous data, and further, the communication device obtains a second PPDU according to the invalid data and the second MPDU, namely when the generation time interval between the second MPDU and the first MPDU is too long due to the reasons of congestion of a data bus, congestion of access of a storage device and the like, the continuity of data flow of the PPDU positioned at a PHY is ensured, the transmission cutoff risk at the PHY layer is reduced, and the throughput rate of a WLAN system is improved.

In one possible implementation manner of the second aspect of the embodiment of the present application,

the counting, according to the first PPDU, the amount of transmitted data in a processing procedure corresponding to the first MPDU includes:

timing a processing process corresponding to the first MPDU to obtain a first duration;

determining the amount of data to be sent in the processing process corresponding to the first MPDU according to the first time length;

the selectively generating invalid data based on the amount of data sent includes:

the invalid data is selectively generated based on the amount of the transmitted data and the amount of the transmitted data.

In a possible implementation manner of the second aspect of the embodiment of the present application, the selectively generating the invalid data according to the amount of the transmitted data and the amount of the transmitted data includes:

and generating the invalid data when the difference value between the transmitted data quantity and the first data quantity is larger than a first threshold.

In a possible implementation manner of the second aspect of the embodiment of the present application, the data amount of the invalid data is not greater than the first threshold.

In a possible implementation manner of the second aspect of the embodiment of the present application, the data amount of the invalid data is equal to the first threshold.

In a possible implementation manner of the second aspect of the embodiment of the present application, the first MPDU includes a first identifier, and determining, according to the first time length, an amount of data to be transmitted in a processing procedure corresponding to the first MPDU includes:

And determining the amount of the data to be sent according to the first duration and the transmission parameters corresponding to the first identifier, wherein the transmission parameters comprise a user modulation mode, bandwidth and/or stream number.

In a possible implementation manner of the second aspect of the embodiment of the present application, the invalid data includes at least one delimiter.

In a possible implementation manner of the second aspect of the embodiment of the present application, the symbol length of the at least one delimiter is 0.

In a possible implementation manner of the second aspect of the embodiment of the present application, the format of the first PPDU preamble is a high throughput HT, a very high throughput VHT and/or a high efficiency HE; and/or the number of the groups of groups,

In one possible implementation manner of the second aspect of the embodiment of the present application, the first MPDU and the second MPDU are included in an aggregated medium access control layer protocol data unit a-MPDU.

A third aspect of the embodiments of the present application provides a communication apparatus (or WLAN device) for use in a wireless local area network WLAN, comprising a memory and a processor; wherein the memory is configured to store first data for generating a first medium access control layer protocol data unit MPDU and second data for generating a second MPDU; the processor is configured to read the first data and the second data and perform the method as described in the second aspect or in different possible implementations of the first aspect.

In a possible implementation manner of the third aspect of the embodiment of the present application, the memory includes a double rate synchronous dynamic random access memory DDR.

A fourth aspect of the present application provides a communication system for use in a wireless local area network WLAN, comprising at least one communication device (or WLAN apparatus), wherein the communication device is a communication device in the first aspect (or third aspect) and any one of its possible implementations.

A fifth aspect of the application provides a computer readable storage medium storing one or more computer executable instructions which, when executed by a processor, perform a method as described in the second aspect or any one of the possible implementations of the second aspect.

A sixth aspect of the application provides a computer program product (or computer program) storing one or more computers which, when executed by the processor, performs the method of the second aspect or any one of the possible implementations of the second aspect.

A seventh aspect of the present application provides a chip system comprising a processor for supporting a wireless local area network communication device to implement the functionality referred to in the second aspect or any one of the possible implementations of the second aspect.

In one possible design, the system on a chip may further include a memory to hold the program instructions and data necessary for the controller. The chip system can be composed of chips, and can also comprise chips and other discrete devices.

The technical effects of the second to seventh aspects or any one of the possible implementation manners of the second to seventh aspects may be referred to the technical effects of the first aspect or the technical effects of the different possible implementation manners of the first aspect, which are not described herein.

In this embodiment, a communication device applied to a WLAN includes: a medium access control layer protocol data unit MPDU generating circuit configured to generate a first MPDU and a second MPDU; the processing circuit is used for processing the first MPDU and generating a first physical layer protocol data unit (PPDU); a statistics circuit, configured to count, according to the first PPDU, an amount of transmitted data in a processing procedure corresponding to the first MPDU; the processing circuit is further configured to selectively generate invalid data according to the transmitted data amount, where the invalid data is used to indicate that the first MPDU and the second MPDU are continuous data, and fill the invalid data between the first MPDU and the second MPDU; the processing circuit is further configured to process the invalid data and the second MPDU to generate a second PPDU. The processing unit in the communication device selectively generates invalid data according to the sent data amount in the processing process corresponding to the processed first MPDU, the invalid data is filled between the first MPDU and the second MPDU, the invalid data is used for indicating that the first MPDU and the second MPDU are continuous data, and further, the processing unit in the communication device obtains the second PPDU according to the invalid data and the second MPDU, namely when the generation time interval between the second MPDU and the first MPDU is overlong due to the reasons of congestion of a data bus, congestion of access of a storage device and the like, the continuity of data flow of the PPDU positioned at the PHY is ensured, the transmission cut-off risk at the PHY layer is reduced, and the throughput rate of a WLAN system is improved.

Drawings

Fig. 1-1 is a schematic diagram of a network architecture of a WLAN according to an embodiment of the present application;

fig. 1-2 are schematic diagrams of a communication method applied to a WLAN according to an embodiment of the present application;

fig. 2 is another schematic diagram of a communication method applied to a WLAN according to an embodiment of the present application;

fig. 3 is another schematic diagram of a communication method applied to a WLAN according to an embodiment of the present application;

fig. 4 is another schematic diagram of a communication method applied to a WLAN according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a communication device according to an embodiment of the present application;

fig. 6 is another schematic diagram of a communication device according to an embodiment of the application.

Detailed Description

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

A wireless local area network (wireless local area network, WLAN) is a network system that uses radio frequency technology for data transmission over the air.

1-1, a schematic diagram of a network architecture of a WLAN in which a plurality of WLAN devices, such as a communication device (or terminal device) 103, a WLAN management device including an Access Point (AP) 102 and an optional access point controller (access point controller, AC) 101 are included. The communication device 103 may include a mobile phone, a tablet, a camera device, an access control device, and the like, and WLAN communication may be implemented after the communication device 103 establishes a connection with the AP 102. In addition, the AP102 may set a communication control policy of the communication device 103 and its own, optionally, the controller 101 in the WLAN network architecture may also implement WLAN communication for controlling the AP102 and the communication device 103 accessing the AP102, and specifically, the controller 101 may include an AC, a cloud controller, and/or other devices connected to the AP, which is not limited herein.

Taking the network structure shown in fig. 1-1 as an example, in WLAN communication, when different WLAN devices communicate with each other, when a WLAN device serving as a transmitting end transmits data, the data is processed by a medium access control (medium access control, MAC) layer in the transmitting end, and then the processed data is further encapsulated in a physical layer (PHY) and transmitted to the outside.

In recent years, the transmission rate of WLANs has been increasing. In the 802.11ax protocol, the PHY layer transmission rate of the WLAN reaches 9.8 gigabits per second (Gbps). This also places very high demands on the MAC layer transmission capabilities of the WLAN. The MAC layer must output high traffic data without interruption to ensure that the PHY layer is not down. But for various reasons it is difficult for the MAC layer input to guarantee this. For example, congestion of a data bus, congestion of access of storage devices such as Double Data Rate (DDR) and the like, may all cause fluctuations of the input end traffic of the MAC layer, and further cause PHY layer data to flow out.

Illustratively, if the PHY data is out of stream, a cyclic redundancy check (cyclic redundancy check, CRC) check error may be present at the receiving end. According to the WLAN protocol, the receiving end may understand that the channel quality is bad when the CRC check is wrong. At this point, the receiving end may either reduce the modulation and coding strategy (modulation and conding scheme, MCS) of the data transmission or trigger the transmitting end to wait for additional channel back-off time. This results in reduced throughput of the WLAN system.

In the conventional technical solution, the input data outage prevention at the MAC layer is mainly achieved by increasing the data buffer in the MAC layer, and particularly please refer to the communication method applied to the WLAN shown in fig. 1-2. In the WLAN device, after data is read through the DDR/data bus S101 and the data reading module S102, before the MPDU is generated by the MPDU generating module S104, a "MAC input buffer S103" is added; or after the aggregated MPDU (aggregate MAC protocol data unit, a-MPDU) aggregation module S105 performs aggregation of a plurality of MPDUs, the "MAC output buffer S106" is added. Meanwhile, the processing power of the MPDU generating module S104 and the a-MPDU aggregating module S105 of the MAC is slightly larger than the data traffic of the PHY, so that these buffers can always be filled up and output to the PHY layer processing S107. That is, when an input-side interrupt is generated, the PHY requirements are met by virtue of the data in the buffer. Wherein, the MPDU generating module S104 is configured to generate an MPDU according to a WLAN protocol; the a-MPDU aggregation module S105 is configured to aggregate a plurality of MPDUs into one a-MPDU according to a WLAN protocol.

In particular, in the scheme implemented by fig. 1-2 for preventing incoming data traffic, for example, even though the probability of DDR per microsecond (us) access congestion is as low as 1%, there is approximately 50us of incoming traffic during a WLAN PPDU transmission that lasts 5 milliseconds (ms). Then the MAC has to reserve a buffer space with a size of 50us data volume to guarantee that the PHY layer is not streaming. At the peak rate of the 802.11ax protocol, the 50us data size is approximately 80 kilobits (kbytes). In an actual system, due to cost consideration, the capacity of DDR matched with the WLAN is basically equivalent to the air interface transmission capacity, the access congestion probability of DDR per us can reach 3-5%, and the output can be guaranteed to be continuous only by using a larger cache space, so that the cost of the system is increased. In addition, since input congestion is a probabilistic event, as long as there is a theoretical possibility that congestion is longer than the MAC buffer data amount, the interruption cannot be completely avoided. Therefore, adding the MAC buffer can only relieve the problem of cut-off, and the problem cannot be fundamentally solved.

In summary, due to the congestion of the data bus, the congestion of the access of the storage device, and the like, the flow of the input end of the MAC layer is easy to fluctuate, and the PHY layer data is further blocked, so that the throughput rate of the WLAN system is reduced. Therefore, how to reduce the risk of transmission interruption at the PHY layer in the data transmission process of WLAN is a technical problem to be solved.

In order to solve the above problems, an embodiment of the present application provides a communication method and a communication device applied to WLAN, which are used for reducing the risk of transmission interruption at PHY layer and improving the throughput rate of WLAN system.

Referring to fig. 2, a schematic diagram of a communication method applied to a WLAN according to an embodiment of the application is provided, and the method includes the following steps.

S201, the communication device generates a first medium access control layer protocol data unit MPDU and a second MPDU.

In this embodiment, a communication apparatus (or referred to as WLAN device) as a transmitting end needs to generate at least one MPDU in a MAC layer before data is transferred from the MAC layer to a PHY layer in step S201, where the at least one MPDU may include a first MPDU and a second MPDU.

In particular, the first MPDU and the second MPDU may be included in a same aggregate medium access control layer protocol data unit a-MPDU. That is, the first MPDU and the second MPDU may be different portions of the a-MPDU, such that the scheme may be applied to a scenario in which the MPDUs are aggregated medium access control layer protocol data units a-MPDUs.

Alternatively, the first MPDU and the second MPDU may also be MPDUs that are independent of each other, i.e. both are not included in the same a-MPDU.

S202, the communication device processes the first MPDU to generate a first physical layer protocol data unit (PPDU).

In this embodiment, the communication apparatus processes the first MPDU obtained in step S201 in step S202, and generates a first PPDU. The communication device further includes other untransmitted parts, such as a second MPDU, or other MDPU, and the second MPDU may be processed to obtain a second PPDU.

Specifically, the format of the first PPDU preamble is High Throughput (HT), very high throughput (very high throughput, VHT), and/or High Efficiency (HE). Among them, there is a high risk of cut-off due to a large amount of transmitted PPDU traffic when the PPDU preamble format is HT, VHT, and/or HE. Therefore, the embodiment can be applied to the data transmission scenario when the PPDU preamble format is HT, VHT and/or HE, so as to reduce the PHY outage risk in the corresponding transmission scenario.

S203, counting the sent data quantity in the processing process corresponding to the first MPDU according to the first PPDU.

In this embodiment, the communication device counts, according to the first PPDU processed in step S202, the amount of transmitted data in the processing procedure corresponding to the first MPDU.

Specifically, in the implementation process of step S203, the communication device may time the processing procedure corresponding to the first MPDU to obtain a first duration, and then determine, according to the first duration, an amount of data to be transmitted in the processing procedure corresponding to the first MPDU. The first MPDU may include a first identifier, that is, the communication device determines, in step S203, the amount of data to be transmitted according to the first duration and a transmission parameter corresponding to the first identifier, where the transmission parameter includes a user modulation mode, a bandwidth, and/or a stream number. Thus, the determining of the amount of data to be transmitted of the first MPDU may include determining the amount of data to be transmitted according to the transmission parameter corresponding to the first identifier and the first duration, i.e. according to the related transmission parameter of the first MPDU.

Optionally, the communication device may determine the amount of the data to be sent in step S203 by other methods, such as estimating the amount of the data to be sent through historical transmission, or by other methods, which are not limited herein.

S204, selectively generating invalid data according to the transmitted data amount, and filling the invalid data between the first MPDU and the second MPDU.

In this embodiment, the communication apparatus selectively generates invalid data in step S204 according to the transmitted data amount determined in step S203, and fills the invalid data between the seismograph MPDU and the second MPDU. Wherein the invalid data may be used to indicate that the first MPDU and the second MPDU are continuous data.

Specifically, when the communication device counts the processing procedure corresponding to the first MPDU in step S203 to obtain a first time length, and determines, according to the first time length, a data amount to be transmitted in the processing procedure corresponding to the first MPDU; the communication device may selectively generate the invalid data according to the amount of the transmitted data and the amount of the transmitted data in step S204. The communication device may selectively generate the invalid data based on the determined amount of the transmitted data and the determined amount of the transmitted data, and may specifically be selected according to a mathematical relationship between the amount of the transmitted data and the amount of the transmitted data, for example, a comparison result between a ratio of the transmitted data and a threshold value, a comparison result between a difference value of the transmitted data and the threshold value, or other comparison results.

Illustratively, the communication device may generate the invalid data when the difference between the amount of the transmitted data and the first amount of data is greater than a first threshold in step S204.

Optionally, when the difference between the amount of the reply data and the first amount of data is less than a first threshold, the communication device determines that there is no transmission interruption, i.e., the communication device does not generate invalid data. Illustratively, the communication device determines that there is a transmission outage when the difference between the amount of the reply data and the first amount of data is equal to a first threshold, at which time the communication device generates invalid data; alternatively, when the difference between the amount of the transmitted data and the first amount of data is equal to a first threshold, the communication device determines that there is no transmission interruption, and at this time, the communication device generates invalid data. In addition, the communication device may obtain the first threshold in a preconfigured manner, and begin to determine the first threshold by receiving an instruction of other devices, or determine the first threshold in response to an operation instruction of a user, which is not limited herein.

The communication device determines whether a judging basis of transmission interruption exists, and can be the size relation between the difference value of the transmitted data quantity and the actual data quantity and the first threshold. Wherein when the difference is greater than a first threshold, it may be determined that there is a high risk of transmission interruption, i.e., the communication device determines that there is a transmission interruption between the first MPDU and the second MPDU and generates invalid data and removes the transmission interruption by filling the invalid data.

Specifically, the data amount of the invalid data generated by the communication apparatus in step S204 may be not greater than the first threshold. And the data quantity of invalid data between the first MPDU and the second MPDU is not more than the first threshold, and redundant invalid data is avoided and the throughput rate is improved on the premise of ensuring the continuity of the data stream of the PPDU positioned at the PHY.

Further, the data amount of the invalid data is equal to the first threshold. That is, the amount of invalid data between the first MPDU and the second MPDU is equal to the first threshold to ensure the continuity of the data stream of the PPDU at the PHY.

In one possible implementation, the invalid data includes at least one separator. At this time, the invalid data may be implemented by at least one relimeter, where the relimeter is a kind of MAC data allowed by the WLAN protocol and not carrying valid information. Specifically, the symbol length of the at least one delimiter is 0. That is, the length field of the delimiter between the first portion of the PPDU and the second portion of the PPDU has a value of 0 to avoid excessive buffering.

Illustratively, invalid data is described herein as being implemented by at least one relimiter. The relimiter is MAC data allowed by WLAN protocol and does not carry effective information. In general, as shown in FIG. 3, relimiter has 3 roles:

of the action 1, relimiter, a length (length) field of not 0 is used to indicate the length of each MPDU at the time of a-MPDU aggregation.

And in the action 2 and the reliimiter, the reliimiter with the length field of 0 is used for ensuring the interval between adjacent MPDUs during the aggregation of the A-MPDUs and avoiding burst packet flow.

In action 3, relimmer, a relimmer user with length field 0 fills in long enough padding after the last a-MPDU to meet PHY layer transmission needs.

When the communication device determines that invalid data is generated (i.e., determines that there is a transmission cut-out) according to the first PPDU in step S204, the PHY layer data cut-out can be avoided by padding a length 0 relimitter of a sufficient length, as long as other parts than the first MPDU are transmitted to the PHY layer. Since relimiter does not carry additional information, there is no additional impact.

Specifically, the symbol length of the at least one separator is 0. Wherein a length of a delimiter between the first MPDU and the second MPDU is 0 to avoid excessive buffering.

Further, the number of separators of the at least one separator is not greater than the first threshold. That is, the number of delimiters between the first portion of the PPDU and the second portion of the PPDU is not greater than the first threshold, so that the occurrence of redundant delimiters is avoided on the premise of ensuring the continuity of the data stream of the PPDU located in the PHY, the padding relimitter may reduce the actual transmission throughput to a certain extent, and in order to avoid too much padding of the relimitter, it may be adaptively determined (in step S204) whether there is a risk of interruption at the current moment, and only if there is a risk of interruption, the relimitter may be inserted.

Further, whether or not the communication apparatus selectively generates invalid data in step S204 may also be realized by a judgment process. The communication device judges whether transmission interruption exists or not according to the first PPDU, or whether the transmission interruption risk of the MPDU in the transmission process is large or not, if so, invalid data is generated, and if not, the invalid data is not generated.

Specifically, the determining basis for determining whether there is a transmission interruption in step S204 by the communication device may be various, for example, the determining basis may be the data amount, the transmission duration, etc. of the first PPDU. The following will explain the data amount based on the judgment as the first PPDU.

Illustratively, the determining, by the communication device in step S204, whether there is a transmission break for the MPDU according to the first PPDU includes: the communication device first determines a processing duration of the first MPDU and a data amount of the first PPDU; then, the communication device determines the amount of data to be transmitted of the first MPDU according to the processing duration; when the difference between the amount of the transmitted data and the first amount of data is greater than a first threshold, the communication device determines that a transmission outage exists; the communication device determines that no transmission interruption exists when the difference between the amount of the outgoing data and the first amount of data is less than the first threshold. Wherein the communication device determines that there is a transmission outage when the difference between the amount of the outgoing data and the first amount of data is equal to a first threshold; alternatively, the communication device determines that no transmission interruption exists when the difference between the amount of the outgoing data and the first amount of data is equal to a first threshold. In addition, the communication device may obtain the first threshold through a preconfigured manner, and also starts to determine the first threshold by receiving the indication of other devices, which is not limited herein.

The communication device determines whether a judging basis of transmission interruption exists, and may be a size relationship between a difference value between the amount of data to be transmitted of the first MPDU and a first threshold. Wherein when the difference is greater than a first threshold, it may be determined that the MPDU presents a higher transmission cut-off risk, i.e., the communication device determines that the MPDU presents a transmission cut-off and removes the transmission cut-off by generating a delimiter.

In the above example, the decision basis is a first PPDU, a difference between the amounts of transmitted data of MPDUs, and a first threshold. The determining basis may further include one or more of a transmission duration of the first MPDU, a response duration of the first MPDU, an amount of data that is not transmitted by the second MPDU, etc., and a process of implementing the determining in step S204 is similar to the above example, and is not repeated herein.

S205, processing the invalid data and the second MPDU to generate a second PPDU.

In this embodiment, the communication apparatus processes the invalid data generated in step S204 and the second MPDU in step S201, and generates a second PPDU.

As an alternative implementation, when the communication apparatus determines in step S204 that invalid data is not generated (i.e., determines that there is no transmission break for the MPDU) according to the first PPDU, the communication apparatus does not perform step S2005 but performs other steps. For example, the communication apparatus processes other parts of the MPDUs than the first MPDU; or, the communication device does not generate an additional relimit and directly processes the second MPDU to obtain a second PPDU, and uses the second PPDU as the first PPDU in step S203 and step S204 to determine whether there is a transmission break again; alternatively, the communication device performs other steps, not limited herein.

In this embodiment, in a communication method applied to a wireless local area network WLAN, a communication device generates a first medium access control layer protocol data unit MPDU and a second MPDU; processing the first MPDU to generate a first physical layer protocol data unit (PPDU); counting the transmitted data quantity in the processing process corresponding to the first MPDU according to the first PPDU; selectively generating invalid data according to the amount of transmitted data, and padding the invalid data between the first MPDU and the second MPDU; and processing the invalid data and the second MPDU to generate a second PPDU. The communication device selectively generates invalid data according to the sent data amount in the processing process corresponding to the processed first MPDU, fills the invalid data between the first MPDU and the second MPDU, and the invalid data is used for indicating that the first MPDU and the second MPDU are continuous data, and further, the communication device obtains a second PPDU according to the invalid data and the second MPDU, namely when the generation time interval between the second MPDU and the first MPDU is too long due to the reasons of congestion of a data bus, congestion of access of a storage device and the like, the continuity of data flow of the PPDU positioned at a PHY is ensured, the transmission cutoff risk at the PHY layer is reduced, and the throughput rate of a WLAN system is improved.

Based on the embodiment of the communication method applied to the WLAN shown in fig. 2, compared to the scheme of implementing the MAC layer anti-input data blocking in fig. 1-2, the PHY layer anti-transmission blocking can be implemented without relying on the MAC input buffer S103 in fig. 1-2.

Referring specifically to fig. 4, in another schematic diagram of a communication method applied to a WLAN of the present application, compared with the implementation process of fig. 1-2, the implementation process of the DDR/data bus S301 is similar to the implementation process of the DDR/data bus S101, the implementation process of the data reading module S302 is similar to the implementation process of the data reading module S102, the implementation process of the MPDU generating module S303 is similar to the implementation process of the MPDU generating module S104, the a-MPDU aggregating module S305 is similar to the a-MPDU aggregating module S105, the MAC output buffer module S306 is similar to the MAC output buffer S106, the PHY layer process S307 is similar to the PHY layer process S107, which will not be repeated here. In contrast, the difference is that S304 is newly added with several parts (the newly added parts are indicated by gray filled parts), as follows:

a sending timing A1, configured to count an accumulated time T that the current PPDU has sent;

the data quantity count A2 is used for calculating the data quantity DataLength1 which a certain user of the MAC layer should send at the time T;

The sent data quantity count A3 is used for counting the data quantity DataLength2 actually sent by a certain user of the MAC layer at the time T;

the current interruption risk judging module A4 judges the current interruption risk according to the DataLength1, dataLength2, a certain user transmission bandwidth and a certain user transmission rate;

additional relimiter produces A5, producing a relimiter content fill of length=0;

MUX selects A6, and fills in additional relimiter according to the cutoff risk judgment result; otherwise, waiting for the arrival of the next MPDU.

Specifically, the transmission timing module A1 starts counting from 0 when the PPDU starts transmission (i.e., MPDU starts processing as PPDU), and each us accumulates 1. And the Data quantity counting module A2 calculates data_Length1u according to the output result T of the timing module, the PPDU parameters and the user parameters. According to the WLAN protocol, at time T, the data size DataLength1u that a certain user MAC layer should send is at least:

Data_length1u＝FLOOR[(T–Tpreamble–Tsig+Tdelay)/Tsyml]*Ndbpsu；

where ndbpsu=lookuptable (MCSu, BWu, nssu).

Specifically, the function FLOOR (x) represents an integer not equal to the real number x (i.e., rounding down), and the function LookUpTable (MCSu, BWu, nssu) represents a table look-up result based on the user modulation scheme, bandwidth, and stream number, and the source description of the above parameters is shown in table 1.

TABLE 1

And the sent Data quantity counting module A3 counts the Data quantity of the MAC layer of a user read by the PHY layer in the current PPDU at the moment T to obtain the data_Length2u. And the cut-off risk judging module A4 judges the cut-off risk according to the DataLength1u and the DataLength 2u. The decision logic is as follows:

if DataLength1u > DataLength2u + CutOffTh Ndbpsu, the risk of interruption is high; otherwise the risk of interruption is low. The CutOffTh is here a threshold for controlling the cut-off decision, and is a configurable parameter for controlling the probability of automatic insertion of a delimiter.

The additional reliimiter generation module A5 is fixed according to the protocol reliimiter (format comprising 32 bits (bit) bits), filled in the format shown in table 2.

TABLE 2

The MUX selecting module A6 selects whether to insert a relimmer or continue waiting for the arrival of the next part of the MPDU according to the judgment result of the cut-off risk. If the insertion of relimitter is selected, then inserting a relimitter of length no greater than CutOffTh Ndbppu bit in the data stream to the PHY mitigates the potential for outage.

In this embodiment, the MAC output buffer of the conventional scheme is reserved, but the buffer is small for coping with slight input data traffic fluctuations. At the exit of the MAC output buffer, the "sent data amount calculation module" is notified that there is currently data to be transferred to the PHY, and that the PHY obtains the amount of data in real time. In addition, for the scenario of multi-user parallel transmission in the WLAN protocol (such as PPDU format of vht_mu and he_mu), separate DataLength1u and DataLength2u can be calculated for each parallel user independently, and whether each user needs to insert a relimmer or not can be judged independently, so that all parallel users can be guaranteed not to break.

As can be seen from the embodiments shown in fig. 2 to fig. 4, the embodiment can completely avoid the interruption of the output data of the MAC layer of the WLAN protocol, so that the MAC of the WLAN does not need to use a large internal buffer to avoid the interruption of the transmission data stream, and the continuity of the data stream to the PHY can be ensured by inserting a releaser. In addition, judging the risk of the interruption of the MAC layer data according to the current actual transmission data quantity and the current transmission time, and automatically inserting a relimeter when the risk is large. The adaptive risk judgment can avoid that a large amount of delimiters are inserted to reduce the actual throughput rate. That is, the interruption risk is determined based on the magnitude relation between the amount of data that has been transmitted at the present time and the amount of data that should be transmitted at the present time. The relimeter is inserted only if the risk of interruption is high.

The communication method applied to the WLAN provided by the embodiment of the present application is described above, and the device embodiment of the communication device of the embodiment of the present application is described below with reference to the accompanying drawings.

Referring to fig. 5, a schematic diagram of a communication device 500 according to an embodiment of the application is provided, where the communication device 500 includes:

MPDU generating circuit 501, processing circuit 502, and statistics circuit 503;

specifically, the MPDU generating circuit 501 may be configured to perform an implementation procedure of a module such as the MPDU generating module S303 in fig. 4; the processing circuit 502 may be configured to perform the implementation of the interrupt stream risk decision module A4, MUX select A6, additional relimmer generate A5, etc. of fig. 4; the statistics circuit 503 may be used to perform the implementation of the modules of fig. 4, such as the transmit timer A1, the amount of data to be transmitted count A2, and the amount of data to be transmitted count A3.

Alternatively, the MPDU generating circuit 501 may be configured to perform implementation of the modules of the DDR/data bus S301, the data reading module S302, etc. in fig. 4; the processing circuit 502 may also be configured to perform implementation of the a-MPDU aggregation module S305, the MAC output buffer module S306, the PHY layer process S307, and so on in fig. 4.

The following describes a specific implementation procedure of the communication apparatus 500:

an MPDU generating circuit 501 for generating a first MPDU and a second MPDU;

a processing circuit 502, configured to process the first MPDU and generate a first physical layer protocol data unit PPDU;

a statistics circuit 503, configured to count, according to the first PPDU, an amount of transmitted data in a processing procedure corresponding to the first MPDU;

the processing circuit 502 is further configured to selectively generate invalid data according to the amount of transmitted data, where the invalid data is used to indicate that the first MPDU and the second MPDU are continuous data, and fill the invalid data between the first MPDU and the second MPDU;

the processing circuit 502 is further configured to process the invalid data and the second MPDU to generate a second PPDU.

Wherein, the processing circuit 502 in the communication device 500 selectively generates invalid data according to the transmitted data amount in the processing process corresponding to the processed first MPDU, and fills the invalid data between the first MPDU and the second MPDU, and the invalid data is used for indicating that the first MPDU and the second MPDU are continuous data; further, the processing circuit 502 in the communication apparatus 500 obtains the second PPDU according to the invalid data and the second MPDU, that is, when the generating time interval between the second MPDU and the first MPDU is too long due to congestion of the data bus, congestion of access of the storage device, etc., the continuity of the data stream of the PPDU located in the PHY is ensured, the risk of transmission interruption in the PHY layer is reduced, and the throughput rate of the WLAN system is improved.

In one possible implementation, the statistics circuit 503 is specifically configured to: timing a processing process corresponding to the first MPDU to obtain a first duration; determining the amount of data to be sent in the processing process corresponding to the first MPDU according to the first time length; the processing circuit 502 is specifically configured to: the invalid data is selectively generated based on the amount of the transmitted data and the amount of the transmitted data.

In one possible implementation, the processing circuit 502 is specifically configured to: and generating the invalid data when the difference value between the transmitted data quantity and the first data quantity is larger than a first threshold.

Optionally, when the difference between the amount of the outgoing data and the first amount of data is less than a first threshold, the processing circuit 502 determines that there is no transmission interruption, i.e., the processing circuit 502 does not generate invalid data.

Optionally, when the difference between the amount of the reply data and the first amount of data is equal to a first threshold, the processing circuit 502 determines that there is a transmission outage, at which point the processing circuit 502 generates invalid data; alternatively, the processing circuit 502 determines that there is no transmission outage when the difference between the amount of the outgoing data and the first amount of data is equal to a first threshold, at which point the processing circuit generates invalid data.

Optionally, the processing circuit 502 may obtain the first threshold in a preconfigured manner, and also begin to determine the first threshold by receiving an indication from another device, or determine the first threshold in response to an operation instruction of a user, which is not limited herein.

In one possible implementation, the amount of invalid data is not greater than the first threshold.

In one possible implementation, the amount of invalid data is equal to the first threshold.

In one possible implementation, the first MPDU includes a first identifier, and the statistics circuitry 503 is specifically configured to: and determining the amount of the data to be sent according to the first duration and the transmission parameters corresponding to the first identifier, wherein the transmission parameters comprise a user modulation mode, bandwidth and/or stream number.

Alternatively, the statistics circuit 503 may determine the amount of data to be sent by other methods, such as estimating the amount of data by historical transmission, or by other methods, which are not limited herein.

In one possible implementation, the invalid data includes at least one separator.

In one possible implementation, the symbol length of the at least one separator is 0.

In one possible implementation, the format of the first PPDU preamble is high throughput HT, very high throughput VHT, and/or high efficiency HE; and/or the number of the groups of groups,

In one possible implementation, the first MPDU and the second MPDU are included in an aggregate medium access control layer protocol data unit a-MPDU.

It should be noted that, for the content of the information execution process of the different circuits of the communication device 500, reference may be made to the description of the foregoing embodiment of the method of the present application, and the description is omitted herein.

Fig. 6 shows a schematic diagram of a possible logic structure of a communication device 600 according to the above embodiment according to an embodiment of the present application. The communication device may be a controller, an Access Point (AP) device, a remote radio unit (remote radio unit, RRU), a terminal device, etc. in the WLAN communication system, and the present application is not limited specifically.

The apparatus 600 includes: the processor 601, the device may be further added with a bus 604 based on the processor 601, where the bus 604 is used to establish a communication port 602 and/or a connection of the memory 603 with the processor 601. In an embodiment of the present application, the processor 601 is configured to perform control processing on actions of the communication apparatus 600, for example, the processor 601 is configured to perform functions performed by the MPDU generating circuit 501, the processing circuit 502, and the statistics circuit 503 in fig. 5.

In one possible implementation, a communication port 602 may be added to perform a communication function with other devices to support the communication of the communication apparatus 600, where the communication port 602 may be a communication module such as a transceiver antenna, a bluetooth module, a WI-FI module, or the like, for example.

In another possible implementation, a memory 603 may also be added for storing data of the communication device 600. Wherein the data may include first data for generating a first medium access control layer protocol data unit MPDU and second data for generating a second MPDU; at this time, the processor 601 may be configured to read the first data and the second data and perform the method as described in the previous embodiments.

Alternatively, the memory 603 may be a double rate synchronous dynamic random access memory DDR.

The processor 601 may be a central processor unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. The processor may also be a combination that performs the function of a computation, e.g., a combination comprising one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so forth. Bus 604 may be a peripheral component interconnect standard (Peripheral Component Interconnect, PCI) bus or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 6, but not only one bus or one type of bus.

The embodiment of the application also provides a WLAN communication system, which comprises at least one communication device in the previous embodiment.

Embodiments of the present application also provide a computer readable storage medium storing one or more computers which, when executed by a processor, perform a method as implemented by the communication device described above.

Embodiments of the present application also provide a computer program product (or computer program) storing one or more computers, which when executed by the processor performs the method implemented by the communication device described above.

The embodiment of the application also provides a chip system which comprises a processor and is used for supporting the controller to realize the function realization related to the communication device. In one possible design, the system on a chip may further include a memory to hold the program instructions and data necessary for the controller. The chip system can be composed of chips, and can also comprise chips and other discrete devices.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, 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 with each other may be an indirect coupling or communication connection via some 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 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 technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Claims

A communication device for use in a wireless local area network, WLAN, comprising:

a medium access control layer protocol data unit MPDU generating circuit configured to generate a first MPDU and a second MPDU;

the processing circuit is used for processing the first MPDU and generating a first physical layer protocol data unit (PPDU);

A statistics circuit, configured to count, according to the first PPDU, an amount of transmitted data in a processing procedure corresponding to the first MPDU;

the processing circuit is further configured to selectively generate invalid data according to the amount of transmitted data, and fill the invalid data between the first MPDU and the second MPDU;

and the processing circuit is further used for processing the invalid data and the second MPDU to generate a second PPDU.
The communication device of claim 1, wherein the communication device comprises a plurality of communication devices,

the statistical circuit is specifically configured to:

timing a processing process corresponding to the first MPDU to obtain a first duration;

determining the amount of data to be transmitted in the processing process corresponding to the first MPDU according to the first time length;

the processing circuit is specifically configured to:

and selectively generating the invalid data according to the amount of the transmitted data and the amount of the transmitted data.
The communication device according to claim 2, wherein,

the processing circuit is specifically configured to:

and generating the invalid data when the difference value between the transmitted data quantity and the first data quantity is larger than a first threshold.
A communication device according to claim 3, wherein the amount of invalid data is not greater than the first threshold.
The communication apparatus of claim 4, wherein the amount of invalid data is equal to the first threshold.
The communication apparatus of any one of claims 2 to 5, wherein the first MPDU includes a first identification, the statistics circuitry being specifically configured to:

and determining the amount of the data to be transmitted according to the first duration and the transmission parameters corresponding to the first identifier, wherein the transmission parameters comprise a user modulation mode, bandwidth and/or stream number.
The communication apparatus according to any of claims 1 to 6, wherein the invalid data comprises at least one delimiter.
The communication apparatus of claim 7, wherein the symbol length of the at least one delimiter is 0.
The communication device according to any of claims 1 to 8, characterized in that the format of the first PPDU preamble is high throughput HT, very high throughput VHT and/or high efficiency HE; and/or the number of the groups of groups,

the format of the second PPDU preamble is high throughput HT, very high throughput VHT, and/or high efficiency HE.
The communication apparatus of any of claims 1-9, wherein the first MPDU and the second MPDU are included in an aggregate medium access control layer protocol data unit a-MPDU.
A communication method applied to a wireless local area network WLAN, comprising:

generating a first media access control layer protocol data unit MPDU and a second MPDU;

processing the first MPDU to generate a first physical layer protocol data unit (PPDU);

counting the transmitted data quantity in the processing process corresponding to the first MPDU according to the first PPDU;

selectively generating invalid data according to the sent data amount, and filling the invalid data between the first MPDU and the second MPDU;

and processing the invalid data and the second MPDU to generate a second PPDU.
The communication method according to claim 11, wherein,

the counting, according to the first PPDU, the amount of transmitted data in a processing procedure corresponding to the first MPDU includes:

timing a processing process corresponding to the first MPDU to obtain a first duration;

determining the amount of data to be transmitted in the processing process corresponding to the first MPDU according to the first time length;

the selectively generating invalid data based on the amount of data sent comprises:

and selectively generating the invalid data according to the amount of the transmitted data and the amount of the transmitted data.
The communication method of claim 12, wherein the selectively generating the invalid data based on the amount of transmitted data and the amount of transmitted data comprises:

and generating the invalid data when the difference value between the transmitted data quantity and the first data quantity is larger than a first threshold.
The communication method of claim 13, wherein the amount of invalid data is not greater than the first threshold.
The communication method of claim 14, wherein the amount of invalid data is equal to the first threshold.
The method of any of claims 12-15, wherein the first MPDU includes a first identification, and wherein determining, based on the first time length, an amount of data to be transmitted during processing corresponding to the first MPDU includes:

and determining the amount of the data to be transmitted according to the first duration and the transmission parameters corresponding to the first identifier, wherein the transmission parameters comprise a user modulation mode, bandwidth and/or stream number.
A communication method according to any of claims 11 to 16, wherein said invalid data comprises at least one separator relimiter.
The communication method according to claim 17, wherein the symbol length of the at least one delimiter is 0.
The method according to any of claims 11 to 18, characterized in that the format of the first PPDU preamble is high throughput HT, very high throughput VHT and/or high efficiency HE; and/or the number of the groups of groups,

the format of the second PPDU preamble is high throughput HT, very high throughput VHT, and/or high efficiency HE.
The method of any of claims 11-19, wherein the first MPDU and the second MPDU are included in an aggregate media access control layer protocol data unit a-MPDU.
A communication device for use in a wireless local area network, WLAN, comprising:

a memory and a processor;

the memory is configured to store first data and second data, the first data being configured to generate a first media access control layer protocol data unit MPDU, the second data being configured to generate a second MPDU;

the processor is configured to read the first data and the second data and perform the method of any one of claims 11 to 20.
The communication device of claim 21, wherein the memory comprises a double rate synchronous dynamic random access memory DDR.
A computer readable storage medium for storing program instructions which, when run on a computer, cause the computer to perform the method of any one of claims 11 to 20.
A computer program product, characterized in that the computer performs the method according to any of claims 11 to 20 when the computer program product is executed on a computer.