CN113133059A

CN113133059A - Wireless local area network data transmission method and related equipment

Info

Publication number: CN113133059A
Application number: CN201911415596.0A
Authority: CN
Inventors: 丁旭; 张利
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-07-16
Anticipated expiration: 2039-12-31
Also published as: CN113133059B

Abstract

A Wireless Local Area Network (WLAN) data transmission method is disclosed, which can be applied to the field of wireless communication. The method comprises the following steps: the AP sends a trigger frame to the first STA and the second STA, wherein the trigger frame comprises an allocation indication, the allocation indication comprises allocation information of a first time slice in the first RU and allocation information of a second time slice in the first RU, the first RU is divided into a plurality of time slices, the plurality of time slices are not overlapped with each other, the first time slice is the earliest time slice in the plurality of time slices, the second time slice is one time slice in the plurality of time slices, and the first time slice is different from the second time slice; the AP receives first data sent by a first STA in a first time slice, wherein the first data comprises a lead code; and the AP receives second data sent by the second STA in a second time slice, wherein the second data comprises a midamble. The AP slices the first RU, and the utilization rate of network resources is improved.

Description

Wireless local area network data transmission method and related equipment

Technical Field

The embodiment of the application relates to the field of wireless communication, in particular to a wireless local area network data transmission method and related equipment.

Background

With the maturity of Wireless Local Access Network (WLAN) technology, WLANs are becoming more and more popular due to high transmission speed and low use cost.

In an Orthogonal Frequency Division Multiple Access (OFDMA) transmission scheme adopted by the WLAN standard 802.11ax, different RUs (resource units) can transmit data by dividing the RUs into different frequencies.

In data transmission, in order to ensure that data transmitted by different RUs can be aligned, useless bits need to be filled in the RU with smaller data amount, resulting in waste of network resources.

Disclosure of Invention

The application provides a WLAN data transmission method and related equipment, which can improve the reliability of data transmission on the basis of improving the utilization rate of network resources.

A first aspect of the present application provides a WLAN data transmission method, including:

an Access Point (AP) sends a trigger frame in a broadcast manner, where the trigger frame is used to allocate an RU of the AP, and before data transmission, the AP sends the trigger frame to a first Station (STA) and a second STA, where the trigger frame includes an allocation indication, and the allocation indication includes allocation information of a first time slice in the first RU and allocation information of a second time slice in the first RU, where the first RU is divided into multiple time slices, the multiple time slices are not overlapped with each other, the first time slice is the earliest time slice in the multiple time slices, the second time slice is one time slice in the multiple time slices, and the first time slice is different from the second time slice; after the AP sends the trigger frame to the first STA and the second STA, the AP may receive first data sent by the first STA in a first time slice, where the first data includes a preamble; the AP may also receive second data transmitted by the second STA within a second time slice, the second data including a midamble.

In the application, the AP slices the first RU, and the first STA uses the first time slice, and the second STA uses the second time slice, so that after the AP receives the first data sent by the first STA, the AP can continue to receive the second data sent by the second STA, thereby improving the utilization rate of network resources; and the first data comprises a lead code, the second data comprises a middle code, the lead code comprises channel estimation of the first STA on the AP, and the middle code comprises channel estimation of the second STA on the AP, so that the reliability of data transmission is improved on the basis of improving the utilization rate of network resources.

In one possible design, in a first implementation of the first aspect of the present application, the allocation indication indicates that the first STA occupies the first time slice. The method for allocating the RUs by the AP mainly includes scheduling access and Random Access (RA), and the allocation indication indicates that the first STA occupies the first time slice, which indicates that the AP allocates the first time slice in the scheduling access manner. The preamble is important for the AP to decode data, and if there is no preamble, the data received by the AP in the entire RU may be decoded unsuccessfully, so that in order to ensure that the AP can receive the data carrying the preamble in the first time slice, an allocation indication is defined to indicate that the first STA occupies the first time slice. Thus reducing the risk that data cannot be decoded.

In one possible design, in a second implementation manner of the first aspect of the present application, before the AP sends a trigger frame to the first STA and the second STA, the AP receives a first buffer status report sent by the first STA; after the AP receives the first buffer status report, the AP determines that the first buffer status report indicates that the first to-be-sent data amount of the first STA is smaller than the data amount that can be transmitted in one transmission opportunity (TXOP). Wherein, the first data amount to be transmitted of the first STA is smaller than the data amount capable of being transmitted in one TXOP, and it can be understood that, when the transmission time required for transmitting the first data amount to be transmitted of the first STA is smaller than one TXOP, and the channel to which the first RU belongs is only used for data transmission of one STA, if the first data amount to be transmitted of the first STA is smaller than the data amount capable of being transmitted in one TXOP, the first STA exits the TXOP in advance, the STA needs to re-contend for an RU, which takes much time, the AP can slice an RU in the last physical layer protocol data unit (PPDU) transmission of the data to be transmitted of the STA, and use a part or all of the remaining time in the RU for transmitting data other than the data to be transmitted as a second time slice, the first time slice is occupied by the data to be transmitted of the first STA, so that the TXOP does not need to exit in advance, and the second STA is allowed to continue to use the time of the TXOP, so that the full utilization of the time of the TXOP is ensured, the times of re-competing RUs are reduced, and the utilization rate of network resources is improved.

In one possible design, in a third implementation form of the first aspect of the present application, the allocation indication further includes allocation information of a third time slice in the RU, the third time slice being a next time slice next to the second time slice; and the AP receives third data sent by the second STA in a third time slice, wherein the third data and the second data are continuous, and the third data does not comprise a middle code. The third time slice is the next time slice of the second time slice, and the data corresponding to different time slices except the first time slice should have the intermediate code, but because the second STA occupying the third time slice and the second time slice, the intermediate code of the second data and the intermediate code of the third data will have repeated parts, resulting in the waste of network resources. Therefore, the third data is limited not to include the intermediate code, and the waste of network resources can be reduced.

In one possible design, in a fourth implementation form of the first aspect of the present application, the allocation indication indicates that the second slot is an RA slot.

In one possible design, in a fifth implementation of the first aspect of the present application, the allocation indication indicates that the length of each time slice in the first RU is the same; the allocation indication indicates that different STAs occupy different time slices, each occupying only one time slice. In order to collect more first buffer status reports of STAs, the time slice is divided into as many STAs as possible, so that more first buffer status reports of STAs can be received in fewer PPDU transmission times, and the efficiency of the AP is improved.

In one possible design, in a sixth implementation form of the first aspect of the present application, the allocation indication includes allocation information of the second RU; the AP receives fourth data sent by the third STA in the second RU; before the AP sends a trigger frame to the first STA and the second STA, the AP receives a first buffer status report sent by the first STA; the AP receives a second cache state report sent by a third STA; and the AP determines that the first data volume to be transmitted of the first STA is smaller than the second data volume to be transmitted of the third STA, the first data volume to be transmitted is obtained according to the first cache state report, and the second data volume to be transmitted is obtained according to the second cache state report. When the first data volume to be transmitted of the first STA is greater than or equal to the second data volume to be transmitted of the third STA, the AP may not need to slice the first RU, so that processing resources of the AP on the first RU may be saved.

A second aspect of the present application provides a WLAN data transmission method, including:

the first STA can receive a trigger frame sent by the AP through broadcasting, wherein the trigger frame comprises an allocation indication, the allocation indication comprises allocation information of a first time slice in an RU, the RU is divided into a plurality of time slices, the time slices are not overlapped with each other, the first time slice is one of the time slices, and the first time slice is not the earliest time slice in the time slices; after the first STA may receive the trigger frame transmitted by the AP, the first STA may transmit first data to the AP within a first time slice according to the allocation indication, where the first data includes a midamble and the first data does not include a preamble.

In the application, the RU is divided into a plurality of time slices, the first STA uses the first time slice, and other STAs can use other time slices, so that the utilization rate of network resources can be improved; and the first data comprises a middle code, the first data does not comprise a lead code, and the middle code comprises channel estimation of the first STA on the AP, so that the reliability of data transmission is improved on the basis of saving network resources.

In one possible design, in a first implementation of the second aspect of the present application, the allocation indication indicates that the second STA occupies a second slot, the second slot being the earliest slot of the plurality of slots, the allocation indication indicating that the first slot is an RA slot. The main mode of allocating RUs by the AP comprises scheduling access and RA, and the allocation indication indicates that the first time slice is the RA time slice, which indicates that the AP allocates RUs in the RA mode. The allocation indication further indicates that the second STA occupies the second time slice, which indicates that the AP allocates the second time slice in a scheduled access manner. The preamble is very important for the AP to decode data, and if there is no preamble, the data received by the AP in the entire RU may be decoded unsuccessfully, so that in order to ensure that the AP can receive the data carrying the preamble in the second time slice, in the case that the AP allocates the RU in the RA manner, it is limited that the allocation indication indicates that the second STA occupies the second time slice. Thus reducing the risk that data cannot be decoded.

In one possible design, in a second implementation of the second aspect of the present application, the allocation indication further includes allocation information of a third time slice in the RU, the third time slice being a next time slice next to the first time slice; and the first STA sends second data to the AP in a third time slice, wherein the second data is continuous with the first data, and the second data does not comprise a middle code. The third time slice is the next time slice of the first time slice, and the data corresponding to different time slices except the earliest time slice in the plurality of time slices should have the intermediate code, but because the third time slice and the first time slice are occupied by the first STA, the intermediate code of the first data and the intermediate code of the second data have repeated parts, which results in the waste of network resources. Therefore, the second data is limited not to include the intermediate code, and the waste of network resources can be reduced.

A third aspect of the present application provides an AP, comprising:

a sending unit, configured to send a trigger frame to a first station STA and a second station STA, where the trigger frame includes an allocation indication, and the allocation indication includes allocation information of a first time slice in a first resource unit RU and allocation information of a second time slice in the first RU, the first RU is divided into multiple time slices, the multiple time slices are not overlapped with each other, the first time slice is an earliest time slice in the multiple time slices, the second time slice is one time slice in the multiple time slices, and the first time slice is different from the second time slice;

a first receiving unit, configured to receive first data sent by a first STA in a first time slice, where the first data includes a preamble;

and the second receiving unit is used for receiving second data sent by the second STA in a second time slice, wherein the second data comprises a midamble.

In one possible design, in a first implementation of the third aspect of the present application, the allocation indication indicates that the first STA occupies the first time slice.

In one possible design, in a second implementation manner of the third aspect of the present application, the first receiving unit is further configured to receive a first buffer status report sent by the first STA;

the AP further comprises:

a determining unit, configured to determine that the first buffer status report indicates that the first amount of data to be sent by the first STA is smaller than the amount of data that can be transmitted in one TXOP.

In one possible design, in a third implementation of the third aspect of the present application, the allocation indication further includes allocation information of a third time slice in the RU, the third time slice being a next time slice next to the second time slice;

the first receiving unit is further configured to receive third data sent by the second STA in a third time slice, where the third data and the second data are consecutive, and the third data does not include a midamble.

In one possible design, in a fourth implementation of the third aspect of the present application, the allocation indication indicates that the second slot is a random access, RA, slot.

In one possible design, in a fifth implementation form of the third aspect of the present application, the length of each time slice in the allocation indication RU is the same; the allocation indication indicates that different STAs occupy different time slices, each occupying only one time slice.

In one possible design, in a sixth implementation form of the third aspect of the present application, the allocation indication includes allocation information of the second RU;

the first receiving unit is further configured to receive, in the second RU, fourth data transmitted by the third STA;

the first receiving unit is further configured to receive a first buffer status report sent by the first STA;

the first receiving unit is further configured to receive a second buffer status report sent by the third STA;

the determining unit is further configured to determine that a first amount of data to be transmitted of the first STA is smaller than a second amount of data to be transmitted of the third STA, where the first amount of data to be transmitted is obtained according to the first buffer status report, and the second amount of data to be transmitted is obtained according to the second buffer status report.

A fourth aspect of the present application provides a STA, comprising:

a receiving unit, configured to receive a trigger frame sent by an AP, where the trigger frame includes a first allocation indication, and the allocation indication includes allocation information of a first time slice in a resource unit RU, the RU is divided into multiple time slices, the multiple time slices are not overlapped with each other, the first time slice is one of the multiple time slices, and the first time slice is not an earliest time slice in the multiple time slices;

a sending unit, configured to send first data to the AP within a first time slice according to the allocation indication, where the first data includes a midamble and the first data does not include a preamble.

In one possible design, in a first implementation of the fourth aspect of the present application, the allocation indication indicates that the second STA occupies a second slot, the second slot being the earliest slot of the plurality of slots, the allocation indication indicating that the first slot is an RA slot.

In one possible design, in a second implementation form of the fourth aspect of the present application, the allocation indication further includes allocation information of a third time slice in the RU, the third time slice being a next time slice next to the first time slice;

the transmitting unit is further configured to transmit second data to the AP in a third time slice, where the second data is consecutive to the first data, and the second data does not include a midamble.

A fifth aspect of the present application provides an AP, comprising:

radio Frequency (RF) circuitry and a processor;

wherein the processor is configured to generate a trigger frame for the RF circuit to transmit the trigger frame to the first station STA and the second STA, the trigger frame including an allocation indication, the allocation indication including allocation information of a first time slice in the first resource unit RU and allocation information of a second time slice in the first RU, the first RU being divided into a plurality of time slices, the plurality of time slices being non-overlapping, the first time slice being an earliest time slice in the plurality of time slices, the second time slice being one time slice in the plurality of time slices, the first time slice being different from the second time slice;

the RF circuit is used for receiving first data sent by a first STA in a first time slice, wherein the first data comprises a preamble;

the RF circuit is further configured to receive second data transmitted by the second STA within a second time slice, the second data including a midamble.

A sixth aspect of the present application provides a STA comprising:

RF circuitry and a processor;

the RF circuit is used for receiving a trigger frame sent by an access point AP, wherein the trigger frame comprises an allocation indication, the allocation indication comprises allocation information of a first time slice in a resource unit RU, the RU is divided into a plurality of time slices, the time slices are not overlapped with each other, the first time slice is one of the time slices, and the first time slice is not the earliest time slice in the time slices;

the processor is configured to parse the trigger frame to obtain allocation information of a first time slice in the trigger frame, and enable the RF circuit to send first data to the AP in the first time slice, where the first data includes a midamble and the first data does not include a preamble.

A seventh aspect of the present application provides a computer storage medium, wherein instructions are stored in the computer storage medium, and when executed on a computer, the instructions cause the computer to perform the method according to the first aspect or any one of the embodiments of the first aspect; or performing a method as described in the second aspect or any one of the embodiments of the second aspect.

An eighth aspect of the present application provides a computer program product, which, when executed on a computer, causes the computer to perform the method according to the first aspect or any one of the embodiments of the first aspect; or performing a method as described in the second aspect or any one of the embodiments of the second aspect.

Drawings

FIG. 1 is a schematic diagram of a network framework according to an embodiment of the present application;

fig. 2 is a schematic flow chart of a data transmission method in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a trigger frame in the embodiment of the present application;

FIG. 4 is a schematic structural diagram of a group packing manner in the embodiment of the present application;

FIG. 5 is another schematic diagram of the group packing method in the embodiment of the present application;

FIG. 6 is a schematic structural diagram of an RU in the embodiment of the present application;

FIG. 7 is another schematic structural diagram of an RU in the embodiment of the present application;

FIG. 7a is a schematic structural diagram of an RU in the embodiment of the present application;

FIG. 8 is a schematic structural diagram of an RU in multiple PPDU transmissions in the embodiment of the present application;

FIG. 9 is a schematic structural diagram of an AP in an embodiment of the present application;

FIG. 10 is a schematic structural diagram of an AP in the embodiment of the present application;

fig. 11 is a schematic structural diagram of an STA in the embodiment of the present application;

FIG. 12 is a schematic structural diagram of an AP in the embodiment of the present application;

fig. 13 is another structural diagram of an STA in the embodiment of the present application.

Detailed Description

The embodiment of the application provides a WLAN data transmission method and related equipment, which are applied to the field of wireless communication and can improve the reliability of data transmission on the basis of improving the utilization rate of network resources.

In order to better understand the WLAN data transmission method in the embodiment of the present application, an application scenario of the embodiment of the present application is described below.

A WLAN is mainly composed of STAs, which may also be referred to as user equipments, and an AP.

RU, a smallest time-frequency unit in WLAN is RU, which is a concept smaller than a channel. Unlike REs (resource elements) and RBs (resource blocks) in Long Term Evolution (LTE), the size of REs and RBs in LTE is fixed, while in WLAN there are many different sizes of RUs, e.g. one RU may include 26, 52, 106, 242, 484 and 996 subcarriers.

The STA needs to occupy the RU when uploading data to the AP, so the AP needs to allocate the RU to the STA before receiving the data sent by the STA, and the methods for allocating the RU by the STA mainly include scheduling access and RA. Before describing the RA and the scheduled access, a description is given to a data transmission mode between the AP and the STA.

The data transmission between the AP and the STA is performed once by once, and in one data transmission, the AP sends a Trigger Frame (TF) to the STA, and declares that this access is started. The trigger frame includes RU allocation information that the AP can use to allow the STA to upload data. And according to the indication of the allocation information in the trigger frame, the STA selects the corresponding RU to perform OFDMA access and data uploading. Different STAs may select different RUs, for example, one channel includes 9 RUs, the AP may establish access relationships with 9 different STAs, and 9 STAs may transmit data to the AP at the same time. After the AP receives all the data sent by all the accessed STAs, the AP feeds back an Acknowledgement Character (ACK) to all the accessed STAs, and ends the data transmission, where one data transmission may also be understood as one PPDU transmission.

The scheduling access means that the RU allocation information carried in the trigger frame includes an identifier of a specific STA, for example, the allocation information of the first RU includes an identifier of the second STA, which indicates that the first RU is used for scheduling access, and a user of the first RU is the second STA.

The random access means that the RU allocation information carried in the trigger frame includes a special identifier, for example, the allocation information of the second RU includes the special identifier, which indicates that the second RU is used for random access, the STA receiving the trigger frame can compete for the second RU, and when there are multiple STAs competing for the second RU at the same time, only one STA can upload data through the second RU; it is also possible that no STA contends for the second RU, i.e., the AP will not receive the data sent by the STA in the second RU.

As described above, the AP will not end the data transmission until it receives all the data transmitted by all the accessed STAs. Therefore, when the data volumes sent by different STAs are different, the STA which finishes sending in advance due to small data volume needs to wait for the STA which finishes sending after the large data volume, which causes waste of network resources.

The above description is made on an application scenario, and a network framework according to an embodiment of the present application is described below.

Fig. 1 is a schematic diagram of a network framework according to an embodiment of the present application.

An AP101, a first STA102, and a second STA 103;

the AP101 establishes a connection with the first STA102 and the second STA103, respectively, via a wireless network.

The first STA102 and the second STA103 in this embodiment may be computers equipped with a wireless network card, or may also be mobile phones, tablet computers, and internet of things terminal devices equipped with a wireless module, or may also be terminal devices such as handheld devices, vehicle-mounted devices, wearable devices, and computing devices with a wireless communication function. The embodiment of the present application takes the first STA as a mobile phone as an example for explanation. The primary function of the first STA102 and the second STA103 is to transmit data to the AP101 in accordance with a trigger frame transmitted by the AP 101.

The AP101 in the embodiment of the present application is an access point of a wireless network, and is commonly referred to as a "hot spot". The main function of the AP101 in the embodiment of the present application is to transmit a trigger frame to the first STA102 and the second STA 103. The AP101 sending the trigger frame to the first STA102 and the second STA103 does not mean that the AP101 sends the trigger frame to the first STA102 and the second STA103 in a targeted manner, but means that the AP101 sends the trigger frame to surrounding STAs, to which the first STA102 and the second STA103 belong, in a broadcast manner.

The network framework in the embodiment of the present application is described above, and the data transmission method in the embodiment of the present application is described below. For example, features or contents identified by broken lines in the drawings related to the embodiments of the present application can be understood as optional operations or optional structures of the embodiments.

Please refer to fig. 2, which is a flowchart illustrating a WLAN data transmission method according to an embodiment of the present application.

In step 201, the first STA transmits a first buffer status report to the AP.

Before the first STA uploads data to the AP, the first STA may send a first buffer status report to the AP, where the first buffer status report carries a first amount of data to be sent of the first STA.

In step 202, the AP determines that the first buffer status report indicates that the first amount of data to be transmitted by the first STA is less than the amount of data that can be transmitted in one TXOP.

When the channel to which the first RU belongs is only used for one STA to transmit data, the AP may determine whether the first buffer status report indicates that the first amount of data to be transmitted of the first STA is smaller than the amount of data that can be transmitted in one TXOP, and after determining that the first buffer status report indicates that the first amount of data to be transmitted of the first STA is smaller than the amount of data that can be transmitted in one TXOP, the AP slices the first RU, and uses a part of or all of the time, except for the time remaining in the first RU for transmitting the data to be transmitted, as the second time slice, where the data to be transmitted of the first STA occupies the first time slice.

In case of using the TXOP mechanism, after the first STA obtains the right to use the RU, the first STA may obtain opportunities for consecutive PPDU transmissions in the RU. When a TXOP mechanism is not adopted, the first STA is allowed to participate in PPDU transmission once, and after the transmission is successful, the first STA loses the right of use of the RU and needs to participate in contention for the RU again; when the TXOP mechanism is adopted, the first STA is allowed to continuously participate in the transmission of a plurality of PPDUs through the RU within a certain time, and does not need to participate in the competition of the RU midway.

Optionally, when the channel to which the first RU belongs is used for multiple STAs to transmit data, the AP may not determine that the first amount of data to be transmitted by the first STA is less than the amount of data that can be transmitted in one TXOP, except for receiving the first buffer status report sent by the first STA; the AP may further receive a second buffer status report sent by the third STA; and the AP determines that the first data volume to be transmitted of the first STA is smaller than the second data volume to be transmitted of the third STA, the first data volume to be transmitted is obtained according to the first cache state report, and the second data volume to be transmitted is obtained according to the second cache state report.

In step 203, the AP transmits a trigger frame to the first STA, the trigger frame including allocation information for the first time slice in the first RU.

Since the first time slice is determined by the AP to be used by the first STA, and thus belongs to the scheduled access, the AP needs to add the identifier of the first STA to the allocation information of the first time slice in the trigger frame. To facilitate understanding of the present invention, the structure of a trigger frame is introduced below for explanation. Referring to fig. 3, notifying the STA of the allocation of time slices in the RU is implemented by adding a new field in the user information list field of the trigger frame. The newly added field includes an RU slice identification field, where the RU slice identification field is used to indicate that the RU is sliced by the AP, and the newly added field also includes an allocation information field of the first time slice, where the field carries an identifier of the first STA, for example, after the first STA establishes a connection with the AP, the AP allocates a sequence number to the first STA, and the sequence number may be used as the identifier of the first STA, and of course, any data may be used as the identifier of the first STA as long as the first STA and the AP agree in advance; the new field further includes an allocation information field of the second time slice, where the field carries a special identifier, and the special identifier is used to indicate that the second time slice is used for random access, for example, the special identifier may be 0, or 2045, or other data. The arrangement order of the allocation information field of the first time slice and the allocation information field of the second time slice in the trigger frame may be as the arrangement order of the first time slice and the second time slice in the RU. The number of the allocation information fields may be the number of time slices after RU slicing, for example, if a plurality of time slices after RU slicing further includes a third time slice, the allocation information field of the third time slice may be added to the newly added field.

The newly added field can be added into the user information list field, can also be added into other fields, and can even be independently newly established with one field; when the new field is added in the user information list field, there may be a different structure, for example, the RU slice identification field is not needed, and the STA knows that the AP slices the RU after recognizing the allocation information field of the first time slice, for example, the allocation information field of the first time slice may be placed in another location. The description of the structure of the trigger frame is introduced only for convenience of understanding the present invention, and the structure of the trigger frame is not limited in this embodiment.

Alternatively, steps 201 and 202 may not be performed, and when steps 201 and 202 are not performed, the AP may not slice the first RU according to the first amount of data to be transmitted of the first STA but directly slice the first RU.

Optionally, when step 201 and step 202 are not executed, the allocation manner of the AP to the first time slice may also be random access, which is used for the STA to compete, and when the allocation manner of the AP to the first time slice is random access, the allocation information of the first time slice in the trigger frame includes the special identifier.

Optionally, the allocation manner of the AP to the second time slice may be random access or scheduling access, and when the allocation manner of the AP to the second time slice is scheduling access, the allocation information of the second time slice in the trigger frame includes an identifier of the second STA.

Optionally, the trigger frame includes allocation information of a third time slice, where the third time slice is a next time slice next to the second time slice.

Optionally, the allocation indication indicates that the length of each time slice in the first RU is the same, so the length of the first time slice is equal to the length of the second time slice.

Optionally, the allocation indication indicates that the length of each time slice in the first RU is the same; the allocation indication indicates that different STAs occupy different time slices, each occupying only one time slice. Wherein the time slice is divided to as many STAs as possible in order to collect the first buffer status reports of more STAs.

Alternatively, the allocation indication includes allocation information of the second RU when a channel to which the first RU belongs is used for the plurality of STAs to transmit data.

In step 204, the AP transmits a trigger frame to the second STA, the trigger frame including allocation information of the second time slice in the RU.

When the AP transmits the trigger frame to the first STA and the second STA in a broadcast manner, the AP may perform the step of transmitting the trigger frame only once, that is, step 204 may not be needed, and the AP also transmits the trigger frame to the second STA in step 203, which is already described in step 203.

In step 205, the first STA transmits first data to the AP, the first data including a preamble.

After receiving the trigger frame, the first STA may obtain an identifier of the first STA carried in the allocation information of the first time slice, and the first STA determines that the identity corresponding to the identifier is itself, so that the first STA may send first data to the AP in the first time slice, where the first data includes a preamble, and the preamble carries channel estimation of the first STA on the AP, so as to ensure reliability of data transmission.

Optionally, when the allocation information of the first time slice carries not an identifier of the first STA but a special identifier, the first STA may contend for the first time slice, and after the contention succeeds, the first STA may send the first data to the AP in the first time slice.

In step 206, the second STA transmits second data to the AP, the second data including a midamble.

After receiving the trigger frame, the second STA may obtain that the allocation information of the second time slice carries the special identifier, and the second STA determines that the second time slice can participate in the contention, and after the contention succeeds, the second STA may send second data to the AP in the second time slice, where the second data includes a midamble, and the midamble carries a channel estimation of the second STA on the AP, so as to ensure reliability of data transmission.

Of course, the second STA may not participate in contending for the second slot, but may participate in contending for other slots; of course, the second STA may not participate in contending for any time slice.

Optionally, when the allocation information of the first time slice carries not a special identifier but an identifier of the second STA, the second STA determines that the identity corresponding to the identifier is itself, and the second STA may send the second data to the AP in the second time slice.

Optionally, when the trigger frame includes allocation information of a third time slice, the third time slice is a next time slice next to the second time slice, and in any case, the second STA may send third data to the AP in the third time slice, where the third data may not carry a midamble.

1. The allocation information of the third time slice carries the identity of the second STA.

2. The allocation information of the third time slice carries the special identifier, and the second STA contends for the third time slice.

Since the second STA occupies both the third time slice and the second time slice, the midamble of the second data and the midamble of the third data have repeated portions, resulting in a waste of network resources. Therefore, the third data can still ensure the reliability of data transmission under the condition that the third data does not comprise the intermediate code, and the waste of network resources can be reduced. The following describes whether the data structure carrying the midamble is described with reference to fig. 4.

Fig. 4 includes a first packet structure 401 and a second packet structure 402, where the first packet structure 401 includes first data, second data and third data, the first data is sent by the first STA to the AP in the first time slice, the second data is sent by the second STA to the AP in the second time slice, the third data is sent by the second STA to the AP in the third time slice, the first data includes a preamble and a load, and the second data and the third data both include a midamble and a load. In the second packet structure 402, the third data does not include a midamble and only includes a payload. Between the first data and the second data, other data may or may not exist.

Optionally, when the trigger frame includes allocation information of a third time slice, where the third time slice is a next time slice next to the first time slice, the first STA may send third data to the AP in the third time slice, and the third data may not carry a midamble. The following describes whether the data structure carrying the midamble is described with reference to fig. 5.

Fig. 5 includes a first packet structure 501 and a second packet structure 502, where the first packet structure 501 includes first data, second data, and third data, the first data is sent by the first STA to the AP in the first time slice, the second data is sent by the second STA to the AP in the second time slice, the third data is sent by the first STA to the AP in the third time slice, the first data includes a preamble and a load, and both the second data and the third data include a midamble and a load. In the second group packet structure 502, the third data does not include a midamble and only includes a payload. Between the third data and the second data, other data may or may not exist.

Alternatively, the first STA may not only transmit the first data to the AP in the first time slice of the RU, but the first STA may also occupy the time slices of other RUs in which the data is transmitted to the AP, for example, as shown in fig. 6, fig. 6 includes a first RU601, a second RU602, a third RU603, a fourth RU604, the first RU601, the second RU602, and the third RU603 are divided into 5 time slices, and the fourth RU604 is divided into 3 time slices, wherein the first STA not only uses the first time slice in the third RU603 but also uses the first to fourth time slices in the second RU 602.

Alternatively, the AP may slice not only all of the RUs, but also a portion of the RUs, and when the AP slices the portion of RUs, the first STA may use not only the time slices of the sliced RUs, but also other non-sliced RUs, for example, as shown in fig. 7, fig. 7 includes a first RU701, a second RU702, a third RU703, and a fourth RU704, where the AP slices the third RU703 and the fourth RU704, and the AP does not slice the first RU701 and the second RU 702. The first STA uses not only the first time slice in the third RU703, but the first STA also uses the second RU 602.

Optionally, when the allocation manner of the AP to the RU is RA, the allocation manner of the AP to the first time slice in the RU employs scheduling access, for example, as shown in fig. 7a, fig. 7a includes a first RU7a01, a second RU7a02, a third RU7a03, and a fourth RU7a04, where all allocation manners except the first time slice of the AP to the third RU7a03 are RA, and only the allocation manner of the first time slice is scheduling access, because in RA, there is a possibility that no STA contends for the first time slice, which results in lack of a preamble, the allocation manner of the first time slice is determined as scheduling access.

Alternatively, the AP may slice the RU in one data transmission with the STA and not slice the RU in another data transmission with the STA. For example, as shown in fig. 8, fig. 8 includes a first RU801, a second RU802, a third RU803, and a fourth RU804, and the third RU803 and the fourth RU804 are sliced by the AP in the first data transmission between the AP and the STA; in the second round of data transmission between the AP and the STA, the RU is not sliced by the AP.

Alternatively, when a channel to which the first RU belongs is used for a plurality of STAs to transmit data, the AP may receive fourth data transmitted by a third STA in the second RU.

Step 203 has no defined timing relationship with step 204 and step 205 has no defined timing relationship with step 206.

The WLAN data transmission method in the embodiment of the present application is described above, and the AP in the embodiment of the present application is described below.

Please refer to fig. 9, which is a schematic structural diagram of an AP in an embodiment of the present application.

A sending unit 901, configured to send a trigger frame to a first station STA and a second station STA, where the trigger frame includes an allocation indication, and the allocation indication includes allocation information of a first time slice in a first resource unit RU and allocation information of a second time slice in the first RU, the first RU is divided into multiple time slices, the multiple time slices are not overlapped with each other, the first time slice is an earliest time slice in the multiple time slices, the second time slice is one time slice in the multiple time slices, and the first time slice is different from the second time slice;

a first receiving unit 902, configured to receive first data sent by a first STA in a first time slice, where the first data includes a preamble;

a second receiving unit 903, configured to receive second data sent by the second STA in a second time slice, where the second data includes a midamble.

In this embodiment, the AP slices the first RU, and the first STA uses the first time slice, and the second STA uses the second time slice, so that after the first receiving unit 902 receives the first data sent by the first STA, the second receiving unit 903 may continue to receive the second data sent by the second STA, and thus, the utilization rate of network resources may be improved; and the first data comprises a lead code, the second data comprises a middle code, the lead code comprises channel estimation of the first STA on the AP, and the middle code comprises channel estimation of the second STA on the AP, so that the reliability of data transmission is improved on the basis of improving the utilization rate of network resources.

Please refer to fig. 10, which is a schematic structural diagram of an AP in the embodiment of the present application.

A sending unit 1001, configured to send a trigger frame to a first station STA and a second STA, where the trigger frame includes an allocation indication, and the allocation indication includes allocation information of a first time slice in a first resource unit RU and allocation information of a second time slice in the first RU, the first RU is divided into multiple time slices, the multiple time slices are not overlapped with each other, the first time slice is an earliest time slice in the multiple time slices, the second time slice is one time slice in the multiple time slices, and the first time slice is different from the second time slice;

a first receiving unit 1002, configured to receive first data sent by a first STA in a first time slice, where the first data includes a preamble;

a second receiving unit 1003, configured to receive second data sent by the second STA in a second time slice, where the second data includes a midamble.

The AP in this embodiment further includes:

in one possible design, the allocation indication indicates that the first STA occupies the first time slice.

In one possible design, the first receiving unit 1002 is further configured to receive a first buffer status report sent by the first STA;

the AP further comprises:

a determining unit 1004, configured to determine that the first buffer status report indicates that the first amount of data to be sent by the first STA is smaller than the amount of data that can be transmitted in one TXOP.

In one possible design, the allocation indication further includes allocation information for a third time slice in the first RU, the third time slice being a next time slice immediately following the second time slice;

In one possible design, the allocation indication indicates that the second time slice is a random access, RA, time slice.

In one possible design, the allocation indication indicates that the length of each time slice in the first RU is the same; the allocation indication indicates that different STAs occupy different time slices, each occupying only one time slice.

In one possible design, the allocation indication includes allocation information for the second RU;

the first receiving unit 1002 is further configured to receive, in the second RU, fourth data sent by the third STA;

the first receiving unit 1002 is further configured to receive a first buffer status report sent by the first STA;

the first receiving unit 1002 is further configured to receive a second buffer status report sent by a third STA;

the determining unit 1004 is further configured to determine that a first amount of data to be transmitted of the first STA is smaller than a second amount of data to be transmitted of the third STA, where the first amount of data to be transmitted is obtained according to the first buffer status report, and the second amount of data to be transmitted is obtained according to the second buffer status report.

In this embodiment, the operations performed by the units of the AP are similar to those described in the embodiment shown in fig. 2, and are not described again here.

Please refer to fig. 11, which is a schematic structural diagram of an STA in the embodiment of the present application.

A receiving unit 1101, configured to receive a trigger frame sent by an access point AP, where the trigger frame includes a first allocation indication, and the allocation indication includes allocation information of a first time slice in a resource unit RU, the RU is divided into multiple time slices, the multiple time slices are not overlapped with each other, the first time slice is one of the multiple time slices, and the first time slice is not an earliest time slice in the multiple time slices;

a sending unit 1102, configured to send first data to the AP within a first time slice according to the allocation indication, where the first data includes a midamble and the first data does not include a preamble.

In this embodiment, the RU is divided into a plurality of time slices, the first STA uses the first time slice, and other STAs can use other time slices, so that the utilization rate of network resources can be improved; and the first data comprises a middle code, the first data does not comprise a lead code, and the middle code comprises channel estimation of the first STA on the AP, so that the reliability of data transmission is improved on the basis of improving the utilization rate of network resources.

The STA in this embodiment further includes:

in one possible design, the allocation indication indicates that the second STA occupies a second slot, the second slot being the earliest slot of the plurality of slots, the allocation indication indicating that the first slot is an RA slot.

In one possible design, the allocation indication further includes allocation information for a third time slice in the RU, the third time slice being a next time slice next to the first time slice;

the sending unit 1102 is further configured to send second data to the AP in a third time slice, where the second data is consecutive to the first data, and the second data does not include a midamble.

In this embodiment, the operations performed by the units of the STA are similar to those described in the embodiment shown in fig. 2, and are not described again here.

Please refer to fig. 12, which is a schematic structural diagram of an AP in the embodiment of the present application.

As shown in fig. 12, the AP1200 includes RF circuitry 1220 and a processor 1210. The RF circuit is also called an RF module. The AP may be the AP in fig. 1, 2.

Wherein the processor 1210 is configured to generate a trigger frame, and cause the RF circuit 1220 to transmit the trigger frame to the first station STA and the second station STA, the trigger frame including an allocation indication, the allocation indication including allocation information of a first time slice in the first resource unit RU and allocation information of a second time slice in the first RU, the first RU being divided into a plurality of time slices, the plurality of time slices being non-overlapping, the first time slice being an earliest time slice in the plurality of time slices, the second time slice being one time slice in the plurality of time slices, the first time slice being different from the second time slice;

the RF circuit 1220 is configured to receive first data transmitted by a first STA in a first time slot, where the first data includes a preamble;

the RF circuit 1220 is further configured to receive second data transmitted by the second STA within a second time slice, the second data including a midamble.

The processor 1210 may be an application-specific integrated circuit (ASIC), a Digital Signal Processor (DSP), a baseband chip, or other chips with specific processing functions, such as a Central Processing Unit (CPU), a Network Processor (NP), a field-programmable gate array (FPGA), or the like, or any combination thereof. The processor 1210 may refer to a single processor or may include multiple processors.

The RF circuit 1220, also referred to as an RF module, is a hardware electronic device for receiving and/or transmitting radio signals between devices. Specifically, the RF circuit 1220 receives uplink information of the STA and then processes the received uplink information with the processor 1380; in addition, the RF circuit 1220 transmits the design downlink data to the STA. In general, the RF circuit 1220 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuitry 1220 may also communicate with networks and other devices via wireless communications. The wireless communication may use any communication standard or protocol, including but not limited to global system for mobile communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Message Service (SMS), etc.

AP1200 may also include a memory, which may be located internal to processor 1210 or external to processor 1210, and which stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof:

and (3) operating instructions: including various operational instructions for performing various operations.

Operating the system: including various system programs for implementing various basic services and for handling hardware-based tasks.

In this embodiment, the processor 1210 may also generate the trigger frame by calling an element of the memory.

Further, processor 1210 may perform all operations that an AP may perform, such as the operations performed by an AP in an embodiment corresponding to fig. 2.

Please refer to fig. 13, which is a schematic structural diagram of an STA in the embodiment of the present application.

As shown in fig. 13, the STA includes RF circuitry 1310 and a processor 1380.

Wherein the RF circuit 1310 is configured to receive a trigger frame sent by the access point AP, where the trigger frame includes an allocation indication, and the allocation indication includes allocation information of a first time slice in a resource unit RU, the RU is divided into a plurality of time slices, the plurality of time slices are not overlapped with each other, the first time slice is one of the plurality of time slices, and the first time slice is not an earliest time slice in the plurality of time slices;

processor 1380 is configured to parse the trigger frame to obtain allocation information of a first time slice in the trigger frame, and let RF circuit 1310 send first data to the AP in the first time slice, where the first data includes a midamble and the first data does not include a preamble.

The processor 1380 may be an application-specific integrated circuit (ASIC), a Digital Signal Processor (DSP), a baseband chip, or other chips with specific processing functions, such as a Central Processing Unit (CPU), a Network Processor (NP), a field-programmable gate array (FPGA), or the like, or any combination thereof. The processor 1380 may refer to one processor or may include multiple processors.

RF circuitry 1310, also referred to as an RF module, is hardware electronics for receiving and/or transmitting radio signals between devices. In particular, RF circuit 1310 receives downlink information from the AP and processes the received information to processor 1380; in addition, RF circuit 1310 transmits data designed for uplink to the AP. In general, the RF circuit 1310 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, RF circuit 1310 may also communicate with networks and other devices via wireless communication. The wireless communication may use any communication standard or protocol, including but not limited to global system for mobile communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Message Service (SMS), etc.

Optionally, in this embodiment, the RF circuit 1310 included in the STA may further have the following functions:

when the allocation indication further includes allocation information for a third time slice in the RU, the third time slice being a next time slice next to the first time slice, the RF circuit 1310 is further configured to transmit second data to the AP in the third time slice, the second data being contiguous with the first data, the second data not including the midamble.

Optionally, when the STA is a mobile phone, the mobile phone may further include a memory 1320, an input unit 1330, a display unit 1340, a sensor 1350, an audio circuit 1360, a speaker 1361, and a microphone 1362.

The memory 1320 may be used to store software programs and modules, and the processor 1380 executes various functional applications and data processing of the cellular phone by operating the software programs and modules stored in the memory 1320. The memory 1320 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the mobile phone. Further, the memory 1320 may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The input unit 1330 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the cellular phone. Specifically, the input unit 1330 may include a touch panel 1331 and other input devices 1332. Touch panel 1331, also referred to as a touch screen, can collect touch operations by a user (e.g., operations by a user on or near touch panel 1331 using any suitable object or accessory such as a finger, a stylus, etc.) and drive the corresponding connection device according to a preset program. Alternatively, the touch panel 1331 may include two portions of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, and sends the touch point coordinates to the processor 1380, where the touch controller can receive and execute commands sent by the processor 1380. In addition, the touch panel 1331 may be implemented by various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. The input unit 1330 may include other input devices 1332 in addition to the touch panel 1331. In particular, other input devices 1332 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.

The display unit 1340 may be used to display information input by a user or information provided to the user and various menus of the cellular phone. The display unit 1340 may include a display panel 1341, and optionally, the display panel 1341 may be configured in the form of a Liquid Crystal Display (LCD), an organic light-emitting diode (OLED), or the like. Further, touch panel 1331 can overlay display panel 1341, and when touch panel 1331 detects a touch operation on or near touch panel 1331, processor 1380 can be configured to determine the type of touch event, and processor 1380 can then provide a corresponding visual output on display panel 1341 based on the type of touch event. Although in fig. 13, the touch panel 1331 and the display panel 1341 are two independent components to implement the input and output functions of the mobile phone, in some embodiments, the touch panel 1331 and the display panel 1341 may be integrated to implement the input and output functions of the mobile phone.

Sensors 1350, such as light sensors, motion sensors, and other sensors. Specifically, the light sensor may include an ambient light sensor that adjusts the brightness of the display panel 1341 according to the brightness of ambient light, and a proximity sensor that turns off the display panel 1341 and/or the backlight when the mobile phone is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when stationary, and can be used for applications of recognizing the posture of a mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; other sensors such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc. may also be configured with the handset.

The audio circuit 1360, speaker 1361, microphone 1362 may provide an audio interface between the user and the handset. The audio circuit 1360 may transmit the electrical signal converted from the received audio data to the speaker 1361, and the electrical signal is converted into a sound signal by the speaker 1361 and output; on the other hand, the microphone 1362 converts the collected sound signal into an electric signal, converts the electric signal into audio data after being received by the audio circuit 1360, and then processes the audio data by the audio data output processor 1380, and then sends the audio data to, for example, another cellular phone via the RF circuit 1310, or outputs the audio data to the memory 1320 for further processing.

The handset also includes a power supply 1390 (e.g., a battery) to supply power to the various components, which may preferably be logically coupled to the processor 1380 via a power management system to manage charging, discharging, and power consumption management functions via the power management system.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute 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), a magnetic disk or an optical disk, and the like.

Claims

1. A Wireless Local Area Network (WLAN) data transmission method is characterized by comprising the following steps:

an Access Point (AP) sends a trigger frame to a first Station (STA) and a second Station (STA), wherein the trigger frame comprises an allocation indication, the allocation indication comprises allocation information of a first time slice in a first Resource Unit (RU) and allocation information of a second time slice in the first RU, the first RU is divided into a plurality of time slices, the plurality of time slices are not overlapped with each other, the first time slice is the earliest time slice in the plurality of time slices, the second time slice is one time slice in the plurality of time slices, and the first time slice is different from the second time slice;

the AP receives first data sent by the first STA in the first time slice, wherein the first data comprises a preamble;

and the AP receives second data sent by the second STA in the second time slice, wherein the second data comprises a middle code.

2. The method of claim 1, wherein the allocation indication indicates that the first STA occupies the first time slice.

3. The method of claim 2, wherein before the AP sends a trigger frame to the first STA and the second STA, the method further comprises:

the AP receives a first cache state report sent by the first STA;

the AP determines that the first buffer status report indicates that the first data volume to be sent of the first STA is smaller than the data volume which can be transmitted in one transmission opportunity (TXOP).

4. The method of any of claims 1 to 3, wherein the allocation indication further comprises allocation information for a third time slice in the first RU, the third time slice being a next time slice to the second time slice;

the method further comprises the following steps:

and the AP receives third data sent by the second STA in the third time slice, wherein the third data and the second data are continuous, and the third data does not comprise a middle code.

5. The method according to any of claims 1 to 4, wherein the allocation indication indicates that the second time slice is a random Access, RA, time slice.

6. A Wireless Local Area Network (WLAN) data transmission method is characterized by comprising the following steps:

a first station STA receives a trigger frame sent by an access point AP, wherein the trigger frame comprises an allocation indication, the allocation indication comprises allocation information of a first time slice in a resource unit RU, the RU is divided into a plurality of time slices, the time slices are not overlapped with each other, the first time slice is one of the time slices, and the first time slice is not the earliest time slice in the time slices;

the first STA sends first data to the AP within the first time slice according to the allocation indication, wherein the first data comprises a middle code, and the first data does not comprise a preamble.

7. The method of claim 6, wherein the allocation indication indicates that the second STA occupies a second time slice, wherein the second time slice is an earliest time slice of the plurality of time slices, and wherein the allocation indication indicates that the first time slice is an RA time slice.

8. The method of claim 6 or 7, wherein the allocation indication further comprises allocation information for a third time slice in the RU, the third time slice being a next time slice next to the first time slice;

the method further comprises the following steps:

and the first STA sends second data to the AP in the third time slice, wherein the second data is continuous with the first data, and the second data does not comprise a middle code.

9. An access point, AP, comprising:

a sending unit, configured to send a trigger frame to a first station STA and a second STA, where the trigger frame includes an allocation indication, and the allocation indication includes allocation information of a first time slice in a first resource unit RU and allocation information of a second time slice in the first RU, the first RU is divided into multiple time slices, the multiple time slices are not overlapped with each other, the first time slice is an earliest time slice in the multiple time slices, the second time slice is one time slice in the multiple time slices, and the first time slice is different from the second time slice;

a first receiving unit, configured to receive first data sent by the first STA in the first time slice, where the first data includes a preamble;

a second receiving unit, configured to receive second data sent by the second STA in the second slot, where the second data includes a midamble.

10. The AP of claim 9, wherein the allocation indication indicates that the first STA occupies the first time slice.

11. The AP of claim 10, wherein the first receiving unit is further configured to receive a first buffer status report sent by the first STA;

the AP further comprises:

a determining unit, configured to determine that the first buffer status report indicates that the first amount of data to be sent of the first STA is smaller than the amount of data that can be transmitted in one transmission opportunity TXOP.

12. The AP of any one of claims 9 to 11, wherein the allocation indication further comprises allocation information for a third time slice in the first RU, the third time slice being a next time slice next to the second time slice;

the first receiving unit is further configured to receive third data sent by the second STA in the third time slice, where the third data and the second data are consecutive, and the third data does not include a midamble.

13. A Station (STA), comprising:

a receiving unit, configured to receive a trigger frame sent by an access point AP, where the trigger frame includes a first allocation indication, and the allocation indication includes allocation information of a first time slice in a first resource unit RU, where the RU is divided into multiple time slices, the multiple time slices are not overlapped with each other, the first time slice is one of the multiple time slices, and the first time slice is not an earliest time slice in the multiple time slices;

a sending unit, configured to send first data to the AP within the first time slice according to the allocation indication, where the first data includes a midamble and the first data does not include a preamble.

14. The STA of claim 13, wherein the allocation indication further includes allocation information for a third time slice in the RU, the third time slice being a next time slice next to the first time slice;

the sending unit is further configured to send second data to the AP within the third time slice, where the second data is consecutive to the first data, and the second data does not include a midamble.

15. An AP, comprising: radio Frequency (RF) circuitry and a processor;

wherein the processor is configured to transmit, with the RF circuitry, a trigger frame to a first station STA and a second STA, the trigger frame including an allocation indication, the allocation indication including allocation information for a first time slice in a first resource unit RU and allocation information for a second time slice in the first RU, the first RU being divided into a plurality of time slices, the plurality of time slices being non-overlapping, the first time slice being an earliest time slice in the plurality of time slices, the second time slice being one of the plurality of time slices, the first time slice being different from the second time slice;

the RF circuit is configured to receive first data sent by the first STA within the first time slot, the first data comprising a preamble;

the RF circuit is further configured to receive second data transmitted by the second STA within the second time slice, the second data including a midamble.

16. A Station (STA), comprising: radio Frequency (RF) circuitry and a processor;

wherein the RF circuitry is configured to receive a trigger frame sent by an access point AP, the trigger frame including an allocation indication, the allocation indication including allocation information for a first time slice in a resource unit RU, the RU being divided into a plurality of time slices, the plurality of time slices being non-overlapping, the first time slice being one of the plurality of time slices, the first time slice not being an earliest time slice in the plurality of time slices;

the processor is configured to transmit first data to the AP within the first time slot in accordance with the allocation indication, the first data including a midamble and the first data not including a preamble.

17. A computer program product, characterized in that the computer program product, when executed on a computer, causes the computer to perform the method of any one of claims 1 to 5 or causes the computer to perform the method of any one of claims 6 to 8.