CN113747602A

CN113747602A - Communication method and device

Info

Publication number: CN113747602A
Application number: CN202010469484.XA
Authority: CN
Inventors: 杨懋; 李波; 李云波; 于健
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2021-12-03
Anticipated expiration: 2040-05-28
Also published as: CN113747602B; WO2021238833A1

Abstract

A communication method and device are used for defining the transmission process under a preemption mechanism. The method comprises the following steps: the first device stops the first transmission at a first time and starts to perform a second transmission at a second time; the transmission priority of the second transmission is higher than the priority of the first transmission; the second time is positioned after the first time and is separated from the first time by a first time length; the second time is earlier than a third time, and the third time is a transmission end time under the condition that the first transmission is not suspended or an end time of TXOP limitation; the first equipment releases the channel after the second transmission is finished; or when the fourth time is earlier than the third time, the first device starts to perform third transmission at a fifth time, and the fifth time is located after the fourth time and separated from the fourth time by a second time length; the fourth time is the time when the second transmission ends.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication method and apparatus.

Background

IEEE 802.11 adopts carrier sense multiple access with collision avoidance (CSMA/CA) technology, in which carrier sensing includes two parts, physical carrier sensing and virtual carrier sensing, specifically:

1) physical carrier sensing and physical layer reception are busy: when a Station (STA) detects that a Received Signal Strength (RSSI) value on a channel exceeds a certain Clear Channel Assessment (CCA) threshold value, the backoff process needs to be stopped. Further, after STA1 sends out a physical layer protocol data unit (PPDU) in 802.11 format, if any other STA (e.g., STA2) parses and calculates the transmission duration T of the PPDU from the PPDU, STA2 sets the physical layer status as busy reception (RX busy) in the next duration T. In the RX Busy state, STA2 is not allowed to perform a backoff procedure to attempt transmission.

2) Virtual carrier sensing: suppose STA1 sends out an 802.11 frame, and the Duration field (Duration) of the Medium Access Control (MAC) frame may carry a Network Allocation Vector (NAV) value T, which represents that STA1 expects to continue to perform continuous transmission or reception operations for a future Duration T after the end of the frame, so as to achieve reservation of channel resources, and this period is called transmission opportunity (TXOP). If any other STA (for example, STA2) parses out the 802.11 frame sent by STA1 and parses out the Duration value T therein, and the current NAV of STA2 is not set or the set end time is earlier than the end time corresponding to the time Duration, it is necessary to set a NAV in the future time Duration T, and it is not allowed to perform the backoff procedure to attempt transmission in this time Duration.

The next generation IEEE 802.11be standard takes the guaranteed delay characteristic as a key technical target, and has gained wide attention in the industry. There are several latency guarantee solutions, of which the preemption mechanism (preempt) is an important mechanism, and the core idea is to suspend ongoing transmission and temporarily transmit a frame with low latency requirement immediately to guarantee its latency requirement. However, there is no clear specification of the preemption mechanism in the current standard.

Disclosure of Invention

The application provides a communication method and a communication device, which are used for determining a transmission process under a preemption mechanism.

In a first aspect, the present application provides a communication method, which may include: the first device stops the first transmission at a first time and starts to perform a second transmission at a second time; the first device releases the channel after the second transmission is finished, or when the fourth time is earlier than the third time, the first device starts to perform third transmission at the fifth time; wherein a transmission priority of the second transmission is higher than a priority of the first transmission; the second time is positioned after the first time and is separated from the first time by a first time length; the second time is earlier than a third time, where the third time is a transmission end time when the first transmission is not suspended, or an end time of transmission opportunity TXOP limitation; the fifth time is positioned after the fourth time and is separated from the fourth time by a second time length; the fourth time is a time when the second transmission ends.

By the method, the transmission process under the preemption mechanism can be clarified, and the fairness among the devices in the communication system can be ensured or the high efficiency of resource utilization can be ensured under the condition of the preemption transmission.

In a possible design, the releasing of the channel by the first device after the second transmission is ended may specifically be: after the second transmission is finished, when the fourth time is earlier than or equal to the third time, the first device releases the channel; further, when the fourth time is earlier than the third time, after the first device releases the channel, no channel contention is performed until the third time is reached. This can ensure fairness among devices.

In a possible design, the releasing the channel by the first device after the second transmission is ended may specifically be: after the second transmission is finished, when the fourth time is earlier than or equal to the third time, the first device releases the channel; further, when the fourth time is earlier than the third time, after the first device releases the channel, the first device performs channel contention again before the third time arrives. This may compensate for the negative effect of the first device's transmission being interrupted.

In a possible design, the first device may release the channel after the second transmission is ended, specifically, the method may further include: after the second transmission is finished, when the fourth time is later than the third time, the first device releases the channel; further, the first device may then perform at least one of the following:

in the third time length, no channel competition is carried out; or

The first device adjusts an Enhanced Distributed Channel Access (EDCA) parameter within the third duration; or

The first device adjusts the maximum transmission duration of each physical layer protocol data unit PPDU sent by the first device within the third duration; or

The first device adjusts the maximum aggregation frame number of each aggregated media access control management protocol data unit (A-MPDU) sent by the first device in the third time length;

wherein a starting time of the third duration is the fourth time, the third duration is related to the fourth time, or the third duration is related to the fourth time and the access type of the first transmission.

By the method, the first device can guarantee fairness for other devices by limiting the first device for a period of time under the condition of occupying multiple channels.

In one possible design, the first device may perform one of the following operations according to a comparison result between a sixth time instant at which the third transmission ends and the third time instant: when the sixth time is earlier than the third time, the first device releases the channel and does not perform channel contention until the third time is reached; or, when the sixth time is later than or equal to the third time, the first device releases the channel. This can ensure the high efficiency of resource utilization.

In one possible design, when the sixth time is later than the third time, the first device does not perform channel contention for a third duration; or, the first device adjusts an enhanced distributed channel access EDCA parameter within the third duration; or, the first device adjusts the maximum transmission duration of each physical layer protocol data unit PPDU sent by the first device within the third duration; or, the first device adjusts the maximum aggregation frame number of each aggregated mac pdu a-MPDU transmitted by the first device within the third duration; wherein a starting time of the third duration is the sixth time, the third duration is related to the sixth time, or the third duration is related to the sixth time and the access type of the first transmission.

In one possible design, the EDCA parameters may include one or more of: contention window CW size, arbitration interframe space AIFS, TXOP duration limits.

In one possible design, when the first transmission is configured with a corresponding acknowledgement frame and when the fourth time is later than the third time and earlier than a preset end time of the acknowledgement frame, the first device may release the channel and re-perform channel contention; alternatively, the first device may start a third transmission at the fifth time. This can ensure the high efficiency of resource utilization.

In one possible design, the first device may release the channel when a sixth time at which the third transmission ends is later than a preset end time of the acknowledgement frame. Therefore, channel resources can be released, and fairness among the devices is guaranteed.

In one possible design, after the first device suspends the first transmission, the first device may further receive an acknowledgement frame corresponding to the first transmission before performing a second transmission. This may allow the transmission of the first device to be relatively complete.

In one possible design, when the first transmission is configured with a corresponding acknowledgement frame and the acknowledgement frame is in an immediate acknowledgement configuration, the first device may further carry an indication to cancel the immediate acknowledgement in a last at least one mac pdu MPDU of the first transmission. This may enable the peer of the first device to specify that the acknowledgement frame of the first transmission may be temporarily not triggered.

In a second aspect, the present application further provides a communication apparatus, which may be a first device, and the communication apparatus has a function of implementing the first device in the above first aspect or each possible design example of the first aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.

In a possible design, the structure of the communication apparatus includes a transceiver unit and a processing unit, and these units may perform corresponding functions of the first device in the first aspect or each possible design example of the first aspect, specifically refer to the detailed description in the method example, which is not described herein again.

In one possible design, the communication apparatus includes a transceiver and a processor, and optionally a memory, in its structure, the transceiver is configured to transmit and receive data and is configured to perform communication interaction with other devices in the communication system, and the processor is configured to support the communication apparatus to perform corresponding functions of the first device in the first aspect or each possible design example of the first aspect. The memory is coupled to the processor and retains program instructions and data necessary for the communication device.

In a third aspect, an embodiment of the present application provides a communication system, which may include the above-mentioned first device, and other devices that communicate with the first device, and the like.

In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores program instructions, and when the program instructions are executed on a computer, the computer is caused to execute the first aspect and any possible design thereof. By way of example, computer readable storage media may be any available media that can be accessed by a computer. Taking this as an example but not limiting: a computer-readable medium may include a non-transitory computer-readable medium, a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a CD-ROM or other optical disk storage, a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

In a fifth aspect, embodiments of the present application provide a computer program product comprising computer program code or instructions, which when run on a computer, causes the computer to implement the method of any one of the first aspect and its possible designs described above.

In a sixth aspect, the present application further provides a chip, coupled to the memory, for reading and executing the program instructions stored in the memory to implement the method of any one of the above first aspect and the first aspect thereof.

For each of the second to sixth aspects and possible technical effects of each aspect, please refer to the above description of the possible technical effects of each possible solution in the first aspect, and no repeated description is given here.

Drawings

Fig. 1 is a schematic architecture diagram of a communication system provided in the present application;

fig. 2 is a schematic structural diagram of an AP or STA provided in the present application;

fig. 3 is a flow chart of a communication method provided herein;

FIG. 4 is a schematic diagram of a transmission process provided herein;

FIG. 5 is a schematic illustration of another transmission process provided herein;

FIG. 6 is a schematic diagram of another transmission process provided herein;

FIG. 7 is a schematic illustration of another transmission process provided herein;

FIG. 8 is a schematic illustration of another transmission process provided herein;

FIG. 9 is a schematic diagram of a transmission process provided herein;

FIG. 10 is a schematic illustration of another transmission process provided herein;

FIG. 11 is a schematic illustration of another transmission process provided herein;

FIG. 12 is a schematic illustration of another transmission process provided herein;

FIG. 13 is a schematic illustration of another transmission process provided herein;

fig. 14 is a schematic structural diagram of a communication device provided in the present application;

fig. 15 is a block diagram of a communication device according to the present application.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings.

The embodiment of the application provides a communication method and a communication device, which are used for determining a transmission process under a preemption mechanism. The method and the device are based on the same technical concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

Hereinafter, some terms in the present application are explained to facilitate understanding by those skilled in the art.

1) And first transmission: also known as an ongoing transmission. Refers to transmissions that were originally ongoing on the channel but require temporary suspension and are interrupted by the preemptive transmission.

And second transmission: also known as preempt transmission. Refers to the transmission that is performed immediately after the first transmission is suspended, and is often used to carry high priority traffic or low latency demand traffic.

And a third transmission: and after the second transmission is finished, the sender of the original first transmission immediately executes the continuous transmission. It is understood that the third transmission is the same as the first transmission, and may, of course, be different.

2) And a single protection setting (TXOP) is a time in which a NAV time length carried in one frame only protects one transmission or one bidirectional frame interaction.

3) And a TXOP of multiple protection setting (multiple protection setting) is a time when a NAV time length carried in one frame will protect multiple rounds of transmission or multiple rounds of frame interaction.

4) The terms "first," "second," and the like in the description of the present application are used for descriptive purposes only and are not intended to indicate or imply relative importance nor order to be construed.

5) In the embodiments of the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a alone, both A and B, and B alone, where A, B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a and b, a and c, b and c, or a, b and c, wherein a, b and c can be single or multiple.

In order to more clearly describe the technical solutions of the embodiments of the present application, the following describes in detail a communication method and apparatus provided by the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 shows an architecture of a possible communication system to which the communication method provided in the embodiment of the present application is applicable. The architecture of the communication system includes at least one Access Point (AP) (e.g., the AP in fig. 1) and at least one Station (STA) (e.g., STA1 and STA2 in fig. 1). Wherein: the AP may include, but is not limited to, a communication server, a router, a switch, a network bridge, etc., and the STA may include, but is not limited to, a mobile phone (mobile phone), a tablet (Pad), a laptop, a smart watch, a smart tv, etc. In general, the STA may be an AP such as the router described above, or a non-access point station (non-AP STA) such as a mobile phone described above.

Illustratively, the specific structure of the AP or STA may be as shown in the block diagram shown in fig. 2, and may include a processor, a memory, a transmitter, a receiver, a signal detector, and a digital signal processor, and optionally may further include a user interface. The transmitter and the receiver may also be a transceiver, which is not limited in this application.

It should be noted that the name of the device shown in fig. 1 is only an example, other names may be available in future communication systems, the number of devices in fig. 1 is also an example, and more or fewer devices may be included, which is not limited in the present application.

The communication method provided by the present application may be applicable to data communication between an AP and one or more STAs, may also be applicable to data communication between an AP and an AP, and may also be applicable to data communication between an STA and an STA, which is not limited in this application.

The following explains the communication method provided by the present application in detail to clarify the transmission process of the preemption mechanism, so that the communication system can efficiently support preemption transmission, and not only guarantees fairness of contention resources between STAs (including AP and non-AP STAs), but also guarantees high efficiency of resource utilization.

Based on the above description, the communication method provided in the embodiment of the present application is applicable to the communication system shown in fig. 1. Referring to fig. 3, the specific process of the method includes:

step 301: the first device stops the first transmission at a first time and starts to perform a second transmission at a second time; wherein a transmission priority of the second transmission is higher than a priority of the first transmission; the second time is positioned after the first time and is separated from the first time by a first time length; the second time is earlier than a third time, where the third time is a transmission end time when the first transmission is not suspended, or an end time of transmission opportunity TXOP limitation. The transmission end time when the first transmission is not suspended, that is, the originally scheduled end time when the first transmission is not suspended, may also be directly referred to as the originally scheduled end time of the first transmission.

Wherein the first device may be an AP or an STA in the communication system shown in fig. 1.

In an alternative embodiment, the first time length may be an inter frame space (xfs), for example, a Short Inter Frame Space (SIFS).

Step 302: the first device may perform operation a1 or operation a2 after the second transmission is ended:

operation a 1: the first device releases the channel;

operation a 2: when a fourth time is earlier than the third time, the first device starts to perform third transmission at a fifth time, wherein the fifth time is located after the fourth time and is separated from the fourth time by a second duration; the fourth moment is the moment when the second transmission ends; illustratively, the second duration may be an xfs, for example, SIFS.

In operation a1 above, in an alternative embodiment, the first device performs operation a1 above when the fourth time is earlier than or equal to the third time. In another alternative embodiment, the first device performs operation a1 when the fourth time is later than the third time.

In an embodiment, in the case that the fourth time is earlier than the third time, after the first device releases the channel, that is, after the first device performs the operation a1, no channel contention is performed until the third time arrives. This may ensure fairness among STAs.

In another embodiment, when the fourth time is earlier than the third time, after the first device releases the channel, that is, after the first device performs the operation a1, the first device may perform channel contention again before the third time arrives. This may compensate for the negative effect of the first device's transmission being interrupted.

In an optional implementation manner, in the case of the operation a2, the first device may further perform one of the following operations according to a comparison result between the sixth time instant when the third transmission ends and the third time instant:

b 1: when the sixth time is earlier than the third time, the first device releases the channel and does not perform channel contention until the third time is reached;

b 2: when the sixth time is later than or equal to the third time, the first device releases the channel.

In an optional embodiment, the first transmission is configured with a corresponding response frame, and when the fourth time is later than the third time and earlier than a preset end time of the response frame, the first device releases the channel and performs channel contention again; or the first device starts a third transmission at the fifth time. Further, when a sixth time at which the third transmission ends is later than a preset end time of the response frame, the first device releases the channel.

In a specific embodiment, when the fourth time is later than the third time, or when the sixth time is later than the third time, the first device may perform one of the following operations:

c 1: the first equipment does not perform channel competition within a third time length; wherein, when the fourth time is later than the third time, the starting time of the third duration is the fourth time, the third duration is related to the fourth time, or the third duration is related to the fourth time and the Access Category (AC) of the first transmission; or, when the sixth time is later than the third time, the starting time of the third duration is the sixth time, and the third duration is related to the sixth time, or the third duration is related to the sixth time and the access type of the first transmission;

for example, the third time duration Δ T may conform to the following formula one or formula two:

ΔT＝f₁(t₂-t₁) A first formula;

wherein f is₁Is a function, e.g. f₁Denotes. DELTA.T ═ T₂-t₁Or Δ T ═ α (T)₂-t₁) Where α is a fixed or modifiable value, t₁Is the third time, t₂Is the fourth time or the sixth time;

ΔT＝f₂(t₂-t₁AC) formula two;

wherein f is₂Is a function representing the value of Δ T and T₂-t₁Is related to the access type AC of the first transmission.

c 2: adjusting, by the first device, an Enhanced Distributed Channel Access (EDCA) parameter within the third duration; illustratively, the EDCA parameters may include, but are not limited to, one or more of: contention Window (CW) size, Arbitration Inter Frame Space (AIFS), TXOP duration limit (TXOP limit); specifically, the first device may adjust the EDCA parameter by increasing the CW, increasing the AIFS, or decreasing the TXOP limit.

c 3: the first device adjusts the maximum transmission time of each physical layer Protocol Data Unit (PPDU) sent by the first device within the third time; for example, the first device may reduce the maximum transmission duration of each PPDU;

c 4: the first device adjusts a maximum aggregation frame number of each Aggregated Medium access control Protocol Data Unit (a-MPDU) sent by the first device within the third duration, for example, the first device may reduce the maximum aggregation frame number of each a-MPDU.

In an optional embodiment, when the first transmission is configured with a corresponding response frame, the first device receives the response frame corresponding to the first transmission before performing the second transmission after suspending the first transmission.

In an optional embodiment, when the first transmission is configured with a corresponding acknowledgement frame and the acknowledgement frame is in an immediate acknowledgement configuration, the first device carries an indication to cancel an immediate acknowledgement in at least one last MPDU of the first transmission, so that the second transmission may be performed directly after the first transmission is aborted. For example, when the MPDU has an IEEE 802.11 frame structure, the first device may modify 00 set in an acknowledgement rule (ACK Policy) field in a quality of service Control (QoS Control) field in the frame structure to 11 to change an immediate acknowledgement rule (i.e., immediate acknowledgement) to a block acknowledgement explicit acknowledgement.

The above description summarizes possible transmission procedures in the case of a pre-emptive transmission in the transmission procedure of the first device, and the following describes different transmission procedures in detail by specific examples respectively. In the following example, the first device is taken as an STA (including an AP and a non-AP STA) as an example.

Example one:

in this example, the preemption mechanism for TXOP is set for single guard and applies to the following scenario: a TXOP Duration (Duration) in a Medium Access Control (MAC) frame in the first transmission is set to 0 or a TXOP Field in a High efficiency Signal Field a (HE SIG-a) of the first transmission is set to UNSPECIFIED (UNSPECIFIED). Specifically, the transmission process in the first example may be:

step d 1: a STA (i.e. the first device) successfully contends for the channel and initiates the first transmission, and the originally scheduled end time of the first transmission (i.e. the third time) is set as

The STA then performs step d 2.

Step d 2: the STA is in

The first transmission is terminated at a time (i.e., the first time), and a second transmission is initiated immediately after waiting for an xfs (e.g., SIFS) duration (i.e., the first time) after the first transmission is terminated. For example, as shown in fig. 4 to 6. Wherein fig. 4 means that the second transmission contains only one frame; fig. 5 and fig. 6 indicate that the second transmission may include a plurality of frames, and specifically may include interactive frames, such as the data frame and the acknowledgement frame in fig. 5, and further such as the trigger frame, the uplink transmission and the acknowledgement frame in fig. 6; it should be noted that, in fig. 6, the STA may be an AP, and the AP schedules an uplink transmission flow by sending a Trigger Frame (TF) in the second transmission process.

In this example one, the end of transmission time of any one frame of the second transmission and the end of NAV setting of each frame of the second transmission in step d2 are both equal to or earlier than the originally-scheduled end of the first transmission

After the second transmission is ended, the STA performs step d 3.

Step d 3: if the end time of the second transmission (i.e., the fourth time) has not yet reached the originally scheduled end time of the first transmission

The STA may perform one of the following:

selecting (1): the STA releases the channel and guarantees that no contention for the channel is allowed until the originally scheduled end time of the first transmission. At this time, the flow ends as shown in fig. 7. It should be noted that, in this selection (1), the device performing the first transmission and the second transmission with the STA also needs to release the channel, and ensure that contention for the channel is not allowed before the originally scheduled end time of the first transmission.

Selecting (2): the STA decides to initiate a third transmission and performs step d4, as shown in fig. 4-6.

Step d 4: the STA initiates the third transmission immediately after the second transmission ends and waits for an xfs (e.g., SIFS) (i.e., at the fifth time). In this example one, the end time of the third transmission (i.e. the sixth time mentioned above) is equal to or earlier than the originally planned end time of the first transmission. The STA then performs step d 5.

Step d 5: if the originally scheduled end time of the first transmission has not been reached after the end of the third transmission

The STA needs to release the channel and ensure that contention for the channel is not allowed until the originally scheduled end of the first transmission. At this point, the flow ends. In this case, the device that performs the third transmission with the STA is not allowed to contend for the channel until the originally scheduled end time of the first transmission.

In the transmission process with the preemptive transmission (second transmission) described in the first example, fairness between STAs and efficiency of resource utilization can be guaranteed.

Example two:

in this example, the same scenario applies as in the first example above, based on the third transmission allowing a preemption mechanism later than the originally scheduled end time of the first transmission. The transmission procedure of example two is generally consistent with the flow of example one above, but differs in that the end time of the third transmission is allowed to be later than the originally-scheduled end time of the first transmission in example two

Specifically, the transmission process of the second example may be:

step e 1: a STA (i.e., a first device) successfully contends for the channel and initiates a first transmission, and sets an originally scheduled end time of the first transmission (i.e., the time is set up above)The third time point) is

The STA then performs step e 2.

Step e 2: the STA is in

The first transmission is terminated at a time (i.e., the first time), and a second transmission is initiated immediately after waiting for an xfs (e.g., SIFS) duration (i.e., the first time) after the first transmission is terminated.

In this second example, unlike the first example step d2, the transmission end time of the second transmission and the end time of the NAV setting of each frame of the second transmission in step e2 are not limited to be equal to or earlier than the originally planned end time of the first transmission

I.e. may be later than

After the second transmission is ended, the STA performs step e 3.

Step e 3: if the end time of the second transmission has reached or exceeded the originally planned end time of the first transmission

The flow ends. Otherwise, if the second transmission end time does not reach the originally planned end time of the first transmission

The STA may perform one of the following:

selecting (1): the STA releases the channel and guarantees that no contention for the channel is allowed until the originally scheduled end time of the first transmission. At this point, the flow ends. It should be noted that, in this selection (1), the device performing the first transmission and the second transmission with the STA also needs to release the channel, and ensure that contention for the channel is not allowed before the originally scheduled end time of the first transmission.

Selecting (2): the STA decides to initiate a third transmission and performs step e 4.

Step e 4: the STA initiates the third transmission immediately after the second transmission ends and waits for the xfs (e.g., SIFS) (i.e., at the fifth time instant). In contrast to the first example, the end time of the third transmission in the second example may exceed the originally planned end time of the first transmission, so that the remaining information of the interrupted first transmission is completely transmitted. The STA then performs step e 5.

Step e 5: end time of the third transmission

(i.e., the sixth time) if the originally scheduled end time of the first transmission is exceeded

The flow ends after the STA performs one of the following options:

selecting (1): the STA releases the channel as shown in fig. 8.

Selecting (2): the STA releases the channel and is not allowed (i.e., prohibited) from contending for the channel for a Δ T time (i.e., the third duration described above), as shown in fig. 9. Wherein the value of Δ T can be determined by the above formula one or formula two, wherein in the above formula one or formula two, T₂Is composed of

t₁Is composed of

Selecting (3): the STA releases the channel and adjusts EDCA parameters for Δ T time. For example, CW is increased, AIFS is increased, or TXOP limit is decreased.

Selecting (4): the channel is released and the STA adjusts the maximum transmission duration of each PPDU within the Δ T time, e.g., decreases the maximum transmission duration of each PPDU.

Selecting (5): the channel is released and the STA adjusts the maximum number of aggregated frames per a-MPDU, e.g., decreases the maximum number of aggregated frames per a-MPDU, within a Δ T time.

With the above example two, on the basis of the above example one, the influence on the first transmission being interrupted can be compensated to some extent after the first transmission is interrupted.

Example three:

the third example is a preemption mechanism for TXOP set by multiple protections, and specifically, the transmission procedure of the third example may be:

step f 1: in a TXOP set by multiple protections (in this example, this TXOP is referred to as an original TXOP), a certain STA is performing a first transmission, and an end time of the TXOP limit of the original TXOP (i.e., the third time) is set as

The STA then performs step f 2.

Step f 2: the STA is in

The first transmission is terminated at a time (i.e., the first time), and the second transmission is initiated immediately after waiting for an xfs (e.g., SIFS) duration (i.e., the first duration) after the first transmission is terminated. It should be noted that neither the expected nor actual end time of the second transmission in this example three needs to be limited by the end time of the TXOP limit. The STA performs step f3 after the second transmission ends.

Step f 3: let the end time of the second transmission (i.e., the fourth time) be

If the end time of the second transmission has not yet been exceeded

Namely, it is

The STA (TXOP holder) may continue to use the original TXOP and the procedure ends. If the end time of the second transmission has been exceeded

Namely, it is

The STA may perform one of the following options and the procedure ends:

selecting (1): the STA releases the channel.

Selecting (2): the STA releases the channel and is not allowed to contend for the channel for a Δ T time (i.e., the third duration described above), as shown in fig. 10. Wherein the value of Δ T can be determined by the above formula one or formula two, wherein in the above formula one or formula two, T₂Is composed of

t₁Is composed of

Options (3) to (5) are the same as options (3) to (5) in step e5 in example two above, and may be referred to each other, and are not described in detail here.

The third example above can be implemented in the preemption mechanism of multi-protection setup TXOP, so that it is not limited by TXOP limit in order to guarantee low latency traffic.

Example four:

this example four addresses the preemption mechanism in case of a first transmission acknowledged, i.e. said first transmission is configured with a corresponding acknowledgement frame. This example four sets the TXOP for single guard and applies to the following scenario: a TXOP Duration (Duration) in the MAC frame in the first transmission is set to 0 or a TXOP field in a high efficiency signal field a (HE SIG-a) of the first transmission is set to UNSPECIFIED (UNSPECIFIED). The fourth example is similar to the first example, except that the STA explicitly knows that the frame originally scheduled to be transmitted by the first transmission has an acknowledgement frame when performing the second transmission and the third transmission, and there is a difference in the calculation of the latest end time of the second transmission. Specifically, the transmission process of the example four may be:

step g 1: a STA (i.e. the first device) successfully contends for the channel and initiates the first transmission, and the originally scheduled end time of the first transmission (i.e. the third time) is set as

And the original plan of the first transmission has a corresponding response frame, the inter-frame interval between the response frame and the original plan ending time of the first transmission is set as yIFS, and the transmission time length of the response frame is assumed to be

The STA then performs step g 2.

Step g 2: the STA is in

The first transmission is terminated at a time (i.e., the first time), and the second transmission is initiated immediately after waiting for an xfs (e.g., SIFS) duration (i.e., the first duration) after the first transmission is terminated. In this example four, the transmission end time of any one frame in the second transmission and the end time of the NAV setting of each frame of the second transmission in step g2 are equal to or earlier than

After the second transmission is ended, the STA performs step g 3.

Step g 3: in one case, the originally scheduled end time of the first transmission is not reached or exceeded when the end time of the second transmission has not yet reached or exceeded the end time of the first transmission

The STA may perform one of the following:

selecting (1): the STA releases the channel and guarantees the originally scheduled end time of the first transmission

Contention for the channel was not previously allowed. At this point, the flow ends. It should be noted that, in this selection (1), the device performing the first transmission and the second transmission with the STA also needs to release the channel, and ensure that contention for the channel is not allowed before the originally scheduled end time of the first transmission.

Selecting (2): the STA decides to initiate a third transmission and then performs step g 4. Wherein, when the transmission end time of the third transmission does not exceed the originally planned end time of the first transmission

The subsequent flow is the same as that of step d5 in example one, and reference may be made to the content of step d5 in example one, and the detailed description is omitted here.

In another case, the end time of the second transmission exceeds the originally scheduled end time of the first transmission

But not more than

(i.e., the preset end time of the above-mentioned response frame), for example, as shown in fig. 11, the STA (and the device performing the first transmission and the second transmission with the STA) may perform one of the following:

selecting (1): the STAs all release the channel and can re-contend for the channel. At this point, the flow ends.

Selecting (2): the STA decides to initiate a third transmission and then performs step g 4.

Step g 4: end time of third transmission end

If it exceeds

The STA performs the selection referred to in step e5 in example two above (1)) One of the options of (1) to (5).

In an alternative embodiment, in this example four, the acknowledgement may be made immediately after the first transmission is interrupted, before the second transmission may be entered, as shown in fig. 12. The transfer process is performed after step g1 above: the STA is in

The first transmission is stopped at the moment, and the second transmission is initiated immediately after the transmission of the response frame of the first transmission is received and the xIFS (such as SIFS) duration is waited. Other processes after the second transmission is finished are consistent with the steps d3-d5 of the first example or are consistent with the steps e3-e5 of the second example, which can be referred to each other and are not described in detail herein.

In an optional implementation manner, in this example four, as shown in fig. 13, the frame of the original first transmission requires the peer to immediately reply an Acknowledgement frame (Acknowledgement) or a Block Acknowledgement frame (Block ACK, BA), but since the second transmission needs to be temporarily transmitted, cancellation of the implicit immediate Acknowledgement rule (ACK Policy field in QoS Control field in IEEE 802.11 frame structure is set to 00) and Block Acknowledgement explicit Acknowledgement (ACK Policy field in QoS Control field in IEEE 802.11 frame structure is set to 11) may be indicated in the last MPDU or the last several MPDUs of the first transmission. Other processes after the first transmission is finished are the same as the steps d2-d5 of the first example or the steps e2-e5 of the second example, and are referred to each other, and are not described in detail herein.

By the fourth example, the second transmission and the third transmission can be adapted to the acknowledgement mechanism, and the transmission is flexible.

Example five:

in this fifth example, the preemption mechanism for the channel is always disallowed, and the third transmission cannot be contended again, which is the same as the scheme corresponding to fig. 7 in the first example. Specifically, the transmission process of the fifth example may be:

steps h 1-h 2 are the same as steps d 1-d 2 in example 1 above, and can be referred to each other and will not be described in detail herein.

Step h 3: if the end time of the second transmission (i.e., the fourth time) has not yet reached the originally scheduled end time of the first transmission

The STA releases the channel and does not allow contention for the channel until the originally scheduled end time of the first transmission. The flow then ends.

Example six:

in the sixth example, which is a preemption mechanism that allows the channel to be released and contended again after the second transmission is finished, the TXOP is set for single protection, and the following scenario applies: a TXOP Duration (Duration) in the MAC frame in the first transmission is set to 0 or a TXOP field in a high efficiency signal field a (HE SIG-a) of the first transmission is set to UNSPECIFIED (UNSPECIFIED). Specifically, the transmission process of the sixth example may be:

steps i 1-i 2 are the same as steps d 1-d 2 in example 1 above, and can be referred to each other and will not be described in detail here.

Step i 3: if the end time of the second transmission (i.e., the fourth time) has not yet reached the originally scheduled end time of the first transmission

The STA releases the channel. But differs from example five in that the STA always allows re-contention for the channel using the IEEE 802.11 existing channel contention mechanism before the originally scheduled end time of the first transmission, after the STA releases the channel. In addition, the recipient of the first transmission and the device making the second transmission with the STA may or may not be allowed to re-contend for the channel using the IEEE 802.11 existing channel contention mechanism prior to the originally scheduled end time of the first transmission. The flow then ends.

In this sixth example, the preemption mechanism that allows the channel to be released and contend for the channel again after the second transmission ends may allow the participants of the interrupted transmission to still contend for the channel again, compensating for the negative impact of interrupted transmission.

Based on the above embodiments, the present application further provides a communication device, and referring to fig. 14, the communication device 1400 may include a processing unit 1401 and a transceiver unit 1402. The transceiver 1402 is configured to perform communication transmission by the communication apparatus 1400, for example, receive information (frame, message or data) or transmit information (frame, message or data), and the processing unit 1401 is configured to control and manage the operation of the communication apparatus 1400. The processing unit 1401 may also control the steps performed by the transceiving unit 1402.

For example, the communication apparatus 1400 may be the first device in the foregoing embodiments, and specifically may be a processor, a chip or a chip system in the first device, or a functional module. Specifically, when the communication device 1400 is used to implement the function of the first device in the embodiment shown in fig. 3, the method may specifically include:

the processing unit 1401 is configured to control the transceiver unit 1402 to suspend a first transmission at a first time and start a second transmission at a second time; wherein a transmission priority of the second transmission is higher than a priority of the first transmission; the second time is positioned after the first time and is separated from the first time by a first time length; the second time is earlier than a third time, where the third time is a transmission end time when the first transmission is not suspended, or an end time of transmission opportunity TXOP limitation; the processing unit 1401 is further configured to release the channel after the second transmission of the transceiver unit 1402 is finished; or after the second transmission of the transceiver unit 1402 is finished, when a fourth time is earlier than the third time, controlling the transceiver unit 1402 to start a third transmission at a fifth time, where the fifth time is located after the fourth time and separated from the fourth time by a second duration; the fourth time is a time when the second transmission ends.

In an optional implementation manner, when the processing unit 1401 releases the channel after the second transmission of the transceiver unit 1402 ends, specifically configured to: releasing the channel when the fourth time is earlier than or equal to the third time after the second transmission of the transceiver unit 1402 is ended; when the fourth time is earlier than the third time, the processing unit 1401, after releasing the channel, is further configured to: and before the third time arrives, not performing channel competition or performing channel competition again.

Specifically, when the processing unit 1401 releases the channel after the second transmission of the transceiver unit 1402 is ended, it is specifically configured to: after the second transmission of the transceiver unit 1402 is finished, when the fourth time is later than the third time, releasing the channel; further, the processing unit 1401 is further configured to: in the third time length, no channel competition is carried out; wherein the starting time of the third duration is the fourth time, the third duration is related to the fourth time, or the third duration is related to the fourth time and the access type of the first transmission; or, adjusting an Enhanced Distributed Channel Access (EDCA) parameter within the third duration; or, adjusting the maximum transmission duration of each physical layer protocol data unit PPDU sent by the first device within the third duration; or, adjusting the maximum aggregation frame number of each aggregated mac pdu a-MPDU transmitted by the first device within the third duration.

In an exemplary embodiment, the processing unit 1401 is further configured to: according to a comparison result between the sixth time when the third transmission of the transceiving unit 1402 ends and the third time, one of the following operations is performed: when the sixth time is earlier than the third time, releasing the channel, and not performing channel competition before the third time is reached; and releasing the channel when the sixth time is later than or equal to the third time.

Illustratively, when the sixth time is later than the third time, the processing unit 1401 is further configured to: in the third time length, no channel competition is carried out; the starting time of the third duration is the sixth time, the third duration is related to the sixth time, or the third duration is related to the sixth time and the access type of the first transmission; or, adjusting an Enhanced Distributed Channel Access (EDCA) parameter within the third duration; or, adjusting the maximum transmission duration of each physical layer protocol data unit PPDU sent by the first device within the third duration; or, adjusting the maximum aggregation frame number of each aggregated mac pdu a-MPDU transmitted by the first device within the third duration.

Specifically, the EDCA parameters may include one or more of: contention window CW size, arbitration interframe space AIFS, TXOP duration limits.

In an optional implementation, the processing unit 1401 is further configured to: the first transmission of the transceiver unit 1402 is configured with a corresponding response frame, and when the fourth time is later than the third time and earlier than a preset end time of the response frame, the channel is released and channel contention is performed again; or, when the fourth time is later than the third time and earlier than a preset end time of the response frame, the transceiver 1402 is controlled to start a third transmission at the fifth time.

In an alternative embodiment, the processing unit 1401 is further configured to: when a sixth time at which the third transmission of the transceiving unit 1402 ends is later than a preset end time of the response frame, the channel is released.

In an alternative embodiment, the processing unit 1401 is further configured to: after controlling the transceiver unit 1402 to suspend the first transmission, the transceiver unit 1402 is controlled to receive a response frame corresponding to the first transmission before performing a second transmission.

In an optional implementation manner, when the first transmission of the transceiver 1402 is configured with a corresponding response frame, and the response frame is in an immediate response configuration, the processing unit 1401 is further configured to: an indication to cancel the immediate acknowledgement is carried in the last at least one medium access control management protocol data unit, MPDU, of the first transmission of the transceiving unit 1402.

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. The 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 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, a network device, or the like) or a processor (processor) 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: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Based on the above embodiments, the present application further provides a communication device, and referring to fig. 15, the communication device 1500 may include a transceiver 1501 and a processor 1502. Optionally, the communication device 1500 may further include a memory 1503. The memory 1503 may be provided inside the communication device 1500 or outside the communication device 1500. The processor 1502 may control the transceiver 1501 to receive and transmit data.

Specifically, the processor 1502 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of the CPU and the NP. The processor 1502 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.

Wherein, the transceiver 1501, the processor 1502 and the memory 1503 are connected to each other. Optionally, the transceiver 1501, the processor 1502 and the memory 1503 are connected to each other by a bus 1504; the bus 1504 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 15, but this is not intended to represent only one bus or type of bus.

In an alternative embodiment, the memory 1503 is used for storing programs and the like. In particular, the program may include program code comprising computer operating instructions. The memory 1503 may include RAM and may also include non-volatile memory (non-volatile memory), such as one or more disk memories. The processor 1502 executes the application program stored in the memory 1503 to implement the above-described functions, thereby implementing the functions of the communication apparatus 1500.

The communication device 1500 may be, for example, the first device described above. When the communication apparatus 1500 is used to implement the function of the first device in the embodiment shown in fig. 3, the method may specifically include:

the transceiver 1501 is configured to perform communication transmission; the processor 1502 is configured to control the transceiver 1501 to suspend a first transmission at a first time and to start a second transmission at a second time; wherein a transmission priority of the second transmission is higher than a priority of the first transmission; the second time is positioned after the first time and is separated from the first time by a first time length; the second time is earlier than a third time, where the third time is a transmission end time when the first transmission is not suspended, or an end time of transmission opportunity TXOP limitation; the processor 1502 is further configured to release a channel after the second transmission of the transceiver 1501 is ended; or after the second transmission of the transceiver 1501 is ended, when a fourth time is earlier than the third time, controlling the transceiver 1501 to start a third transmission at a fifth time, where the fifth time is after the fourth time and is separated from the fourth time by a second duration; the fourth time is a time when the second transmission ends.

In an optional implementation manner, when the processor 1502 releases the channel after the second transmission of the transceiver 1501 is ended, the processor is specifically configured to: releasing a channel when the fourth time is earlier than or equal to the third time after the second transmission by the transceiver 1501 ends; when the fourth time is earlier than the third time, the processor 1502 after releasing the channel is further configured to: and before the third time arrives, not performing channel competition or performing channel competition again.

Specifically, when the processor 1502 releases the channel after the second transmission of the transceiver 1501 is ended, the processor is specifically configured to: releasing a channel when the fourth time is later than the third time after the second transmission of the transceiver 1501 is ended; further, the processor 1502 is further configured to: in the third time length, no channel competition is carried out; wherein the starting time of the third duration is the fourth time, the third duration is related to the fourth time, or the third duration is related to the fourth time and the access type of the first transmission; or, adjusting an Enhanced Distributed Channel Access (EDCA) parameter within the third duration; or, adjusting the maximum transmission duration of each physical layer protocol data unit PPDU sent by the first device within the third duration; or, adjusting the maximum aggregation frame number of each aggregated mac pdu a-MPDU transmitted by the first device within the third duration.

In an exemplary embodiment, the processor 1502 is further configured to: according to a comparison result between a sixth time when the third transmission of the transceiver 1501 is finished and the third time, one of the following operations is performed: when the sixth time of the transceiver 1501 is earlier than the third time, releasing the channel, and not performing channel contention until the third time arrives; and releasing the channel when the sixth time is later than or equal to the third time.

Illustratively, when the sixth time is later than the third time, the processor 1502 is further configured to: in the third time length, no channel competition is carried out; the starting time of the third duration is the sixth time, the third duration is related to the sixth time, or the third duration is related to the sixth time and the access type of the first transmission; or, adjusting an Enhanced Distributed Channel Access (EDCA) parameter within the third duration; or, adjusting the maximum transmission duration of each physical layer protocol data unit PPDU sent by the first device within the third duration; or, adjusting the maximum aggregation frame number of each aggregated mac pdu a-MPDU transmitted by the first device within the third duration.

In an alternative embodiment, the processor 1502 is further configured to: the transceiver 1501 transmits a first transmission frame with a corresponding response frame, and releases a channel and performs channel contention again when the fourth time is later than the third time and earlier than a preset end time of the response frame; alternatively, when the fourth time is later than the third time and earlier than the preset end time of the response frame, the transceiver 1501 is controlled to start the third transmission at the fifth time.

In an alternative embodiment, the processor 1502 is further configured to: when a sixth time at which the third transmission of the transceiver 1501 ends is later than a preset end time of the response frame, the channel is released.

In an alternative embodiment, the processor 1502 is further configured to: after controlling the transceiver 1501 to suspend the first transmission, the transceiver 1501 receives a response frame corresponding to the first transmission before performing a second transmission.

In an alternative embodiment, when the first transmission of the transceiver 1501 is configured with a corresponding acknowledgement frame, and the acknowledgement frame is in an immediate acknowledgement configuration, the processor 1502 is further configured to: an indication to cancel the immediate acknowledgement is carried in the last at least one medium access control management protocol data unit, MPDU, of the first transmission of the transceiver 1501.

Based on the above embodiments, the present application provides a communication system, which may include the STA and the AP related to the above embodiments.

The embodiment of the present application further provides a computer-readable storage medium, which is used for storing a computer program or instructions, and when the computer program or instructions is executed by a computer, the computer can implement the communication method provided by the above method embodiment.

The embodiment of the present application further provides a computer program product, where the computer program product is used to store a computer program, and when the computer program is executed by a computer, the computer may implement the communication method provided by the above method embodiment.

The embodiment of the application also provides a chip, wherein the chip is coupled with the memory and is used for realizing the communication method provided by the embodiment of the method.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method of communication, comprising:

the first device stops the first transmission at a first time and starts to perform a second transmission at a second time; wherein a transmission priority of the second transmission is higher than a priority of the first transmission; the second time is positioned after the first time and is separated from the first time by a first time length; the second time is earlier than a third time, where the third time is a transmission end time when the first transmission is not suspended, or an end time of transmission opportunity TXOP limitation;

the first equipment releases the channel after the second transmission is finished; or when a fourth time is earlier than the third time, the first device starts to perform third transmission at a fifth time, where the fifth time is located after the fourth time and separated from the fourth time by a second duration; the fourth time is a time when the second transmission ends.

2. The method of claim 1, wherein the first device releasing the channel after the second transmission ends, comprising:

after the second transmission is finished, when the fourth time is earlier than or equal to the third time, the first device releases the channel;

when the fourth time is earlier than the third time, after the first device releases the channel, the method further includes:

and the first equipment does not perform channel competition or performs channel competition again before the third time arrives.

3. The method of claim 1, wherein the first device releasing the channel after the second transmission ends, comprising:

after the second transmission is finished, when the fourth time is later than the third time, the first device releases the channel;

the method further comprises the following steps:

the first equipment does not perform channel competition within a third time length; wherein the starting time of the third duration is the fourth time, the third duration is related to the fourth time, or the third duration is related to the fourth time and the access type of the first transmission; or

And the first equipment adjusts the maximum aggregation frame number of each aggregated media access control management protocol data unit A-MPDU sent by the first equipment in the third time length.

4. The method of claim 1, wherein the method further comprises:

the first device executes one of the following operations according to a comparison result between a sixth time when the third transmission is finished and the third time:

when the sixth time is earlier than the third time, the first device releases the channel and does not perform channel contention until the third time is reached;

when the sixth time is later than or equal to the third time, the first device releases the channel.

5. The method of claim 4, wherein when the sixth time is later than the third time, the method further comprises:

the first equipment does not perform channel competition within a third time length; the starting time of the third duration is the sixth time, the third duration is related to the sixth time, or the third duration is related to the sixth time and the access type of the first transmission; or

6. The method of claim 3 or 5, wherein the EDCA parameters comprise one or more of: contention window CW size, arbitration interframe space AIFS, TXOP duration limits.

7. The method of claim 1, wherein the method further comprises:

the first transmission is configured with a corresponding response frame, and when the fourth time is later than the third time and earlier than a preset end time of the response frame, the first device releases the channel and performs channel competition again; or the first device starts a third transmission at the fifth time.

8. The method of claim 7, wherein the method further comprises:

and when the sixth moment when the third transmission is finished is later than the preset finishing moment of the response frame, the first equipment releases the channel.

9. The method of claim 1, wherein the method further comprises:

and after the first device suspends the first transmission and before the first device carries out second transmission, the first device receives a response frame corresponding to the first transmission.

10. The method of claim 1, wherein the method further comprises:

and when the response frame is configured to be an immediate response, the first device carries an indication of canceling the immediate response in at least one last mac pdu of the first transmission.

11. A communications apparatus, comprising:

the receiving and sending unit is used for carrying out communication transmission;

the processing unit is used for controlling the transceiving unit to stop first transmission at a first time and start second transmission at a second time; wherein a transmission priority of the second transmission is higher than a priority of the first transmission; the second time is positioned after the first time and is separated from the first time by a first time length; the second time is earlier than a third time, where the third time is a transmission end time when the first transmission is not suspended, or an end time of transmission opportunity TXOP limitation;

the processing unit is further configured to release the channel after the second transmission of the transceiver unit is ended; or after the second transmission of the transceiver unit is finished, when a fourth time is earlier than the third time, controlling the transceiver unit to start a third transmission at a fifth time, where the fifth time is located after the fourth time and has a second duration from the fourth time; the fourth time is a time when the second transmission ends.

12. The communications apparatus as claimed in claim 11, wherein the processing unit, when releasing the channel after the second transmission of the transceiver unit is finished, is specifically configured to:

releasing a channel when the fourth time is earlier than or equal to the third time after the second transmission of the transceiver unit is finished;

when the fourth time is earlier than the third time, after releasing the channel, the processing unit is further configured to:

and before the third time arrives, not performing channel competition or performing channel competition again.

13. The communications apparatus as claimed in claim 11, wherein the processing unit, when releasing the channel after the second transmission of the transceiver unit is finished, is specifically configured to:

releasing a channel when the fourth time is later than the third time after the second transmission of the transceiver unit is finished;

the processing unit is further configured to:

in the third time length, no channel competition is carried out; wherein the starting time of the third duration is the fourth time, the third duration is related to the fourth time, or the third duration is related to the fourth time and the access type of the first transmission; or

Adjusting an Enhanced Distributed Channel Access (EDCA) parameter within the third duration; or

Adjusting the maximum transmission duration of each physical layer protocol data unit PPDU sent by the first device within the third duration; or

And adjusting the maximum aggregation frame number of each aggregated media access control management protocol data unit (A-MPDU) sent by the first device in the third time length.

14. The communications apparatus of claim 11, wherein the processing unit is further configured to:

according to a comparison result between a sixth time when the third transmission of the transceiver unit ends and the third time, performing one of the following operations:

when the sixth time is earlier than the third time, releasing the channel, and not performing channel competition before the third time is reached;

and releasing the channel when the sixth time is later than or equal to the third time.

15. The communications apparatus of claim 14, wherein when the sixth time is later than the third time, the processing unit is further configured to:

in the third time length, no channel competition is carried out; the starting time of the third duration is the sixth time, the third duration is related to the sixth time, or the third duration is related to the sixth time and the access type of the first transmission; or

16. The communication apparatus of claim 13 or 15, wherein the EDCA parameters comprise one or more of: contention window CW size, arbitration interframe space AIFS, TXOP duration limits.

17. The communications apparatus of claim 11, wherein the processing unit is further configured to:

the first transmission is configured with a corresponding response frame, and when the fourth time is later than the third time and earlier than a preset ending time of the response frame, the channel is released and channel competition is carried out again; or

And when the fourth time is later than the third time and earlier than the preset end time of the response frame, controlling the transceiver unit to start third transmission at the fifth time.

18. The communications apparatus of claim 17, wherein the processing unit is further configured to:

and releasing the channel when the sixth time of the third transmission end of the transceiver unit is later than the preset end time of the response frame.

19. The communications apparatus of claim 11, wherein the processing unit is further configured to:

and after controlling the transceiver unit to stop the first transmission and before performing a second transmission, controlling the transceiver unit to receive a response frame corresponding to the first transmission.

20. The communications apparatus of claim 11, wherein the processing unit is further configured to:

and when the first transmission is configured with a corresponding response frame and the response frame is configured with an immediate response, carrying an indication for canceling the immediate response in at least one media access control Management Protocol Data Unit (MPDU) of the first transmission of the transceiver unit.

21. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1-10.