CN109728893B

CN109728893B - Full-duplex FD transmission method and related equipment

Info

Publication number: CN109728893B
Application number: CN201711062629.9A
Authority: CN
Inventors: 左鑫; 淦明; 梁丹丹; 杨讯
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-10-31
Filing date: 2017-10-31
Publication date: 2021-06-08
Anticipated expiration: 2037-10-31
Also published as: CN109728893A

Abstract

The embodiment of the application discloses a full-duplex FD transmission method and related equipment, which are used for accurately acquiring state information of a self-interference channel before FD transmission is carried out by first network equipment. The full-duplex FD transmission method provided by the embodiment of the application comprises the following steps: the method comprises the steps that a first network device obtains state information of a self-interference channel according to a first signal and a second signal, wherein the first signal is a training sequence for self-interference channel estimation, and the second signal is a signal received by the first network device through the self-interference channel; the first network device performs FD transmission.

Description

Full-duplex FD transmission method and related equipment

Technical Field

The present application relates to the field of data transmission, and in particular, to a full-duplex FD transmission method and related device.

Background

Full Duplex (FD) technology enables a network device to simultaneously receive and transmit data on the same time or frequency network resource. For example, in a Wireless Local Area Network (WLAN), an Access Point (AP) or a station (station) with FD capability often receives and transmits Physical Protocol Data Unit (PPDU) packets at the same time.

The network device often has the self-interference problem in the FD transmission, that is, the PPDU packet sent by the network device to the outside will return to the network device through the self-interference channel, so as to form an interference signal, and the network device aliasing the interference signal in the PPDU packet received at this time, so as to cause inaccuracy of the received PPDU packet. For the self-interference problem of the network device, in the prior art, the network device may perform self-interference channel estimation.

However, in the implementation manner of self-interference channel estimation proposed in the prior art, the network device cannot acquire accurate state information of the self-interference channel, and cannot complete self-interference cancellation, so that the PPDU data packet cannot be correctly received.

Disclosure of Invention

The application provides an FD transmission method and related equipment, which are used for accurately acquiring state information of a self-interference channel before FD transmission is carried out by first network equipment.

In a first aspect, the present application provides an FD transmission method, which specifically includes: the first network device performs self-interference channel estimation according to a first signal and a second signal, so as to obtain state information of a corresponding self-interference channel, wherein the first signal is a training sequence for performing self-interference channel estimation, the second signal is a signal received by the first network device through the self-interference channel, the state information of the self-interference channel can be used for performing self-interference cancellation in FD transmission, and after the state information of the self-interference channel is obtained, the first network device can perform FD transmission if the first network device meets an FD transmission condition.

It can be understood that, before FD transmission, the first network device accurately obtains the state information of the self-interference channel, so as to ensure that the first network device can perform accurate self-interference cancellation according to the state information of the self-interference channel in FD transmission.

With reference to the first aspect of the present application, in a first possible implementation manner of the first aspect of the present application, before the first network device performs self-interference channel estimation according to the first signal and the second signal, the first network device may send the first signal to the target network device first, so that the second signal returned through the self-interference channel after the first signal is sent out may be received.

With reference to the first possible implementation manner of the first aspect of the present application, in a second possible implementation manner of the first aspect of the present application, the first network device may carry the first signal in the acknowledgement signal sent to the target network device, and complete sending of the first signal; or, the first network device may also carry the first signal in the first PPDU packet sent to the target network device to complete the sending of the first signal, and this sending manner may save the sending of the additional signaling, thereby avoiding the overhead of an air interface, and being very beneficial to practical popularization and application.

With reference to the first or second possible implementation manner of the first aspect of the present application, in a third possible implementation manner of the present application, before the first network device sends the first signal to the target network device, a trigger signal sent by the second network device may also be received to trigger sending the first signal to the target network device and performing self-interference channel estimation, where the second network device may also be the target network device in the foregoing under a certain condition.

With reference to the third possible implementation manner of the first aspect of the present application, in a fourth possible implementation manner of the first aspect of the present application, the trigger signal received by the first network device and sent by the second network device may specifically be a specific type of second PPDU data packet, or may specifically be a second packet header in the second PPDU data packet.

With reference to the fourth possible implementation manner of the first aspect of the present application, in a fifth possible implementation manner of the first aspect of the present application, when the trigger signal is specifically a second packet header in a second PPDU data packet, the second packet header may be used to indicate that the second PPDU data packet further includes a third signal after the second packet header, and at this time, the first network device may send the first signal to the target network device after receiving the second packet header and when receiving the third signal, so that the sending of the first signal is completed in the FD transmission.

With reference to the fifth possible implementation manner of the first aspect of the present application, in a sixth possible implementation manner of the first aspect of the present application, when receiving a second signal that is obtained by returning the first signal through the self-interference channel, the first network device also receives a third signal, that is, the first network device receives a fourth signal obtained by superimposing the second signal and the third signal.

With reference to the sixth possible implementation manner of the first aspect of the present application, in a seventh possible implementation manner of the first aspect of the present application, the first network device may remove the third signal from the fourth signal, so as to obtain a remaining second signal, so as to perform self-interference channel estimation.

With reference to any one of the fifth to seventh possible implementation manners of the first aspect of the present application, in an eighth possible implementation manner of the first aspect of the present application, a length of a first signal sent to a target network device by a first network device is smaller than a length of a third signal, so that the third signal can be easily and cleanly removed from a fourth signal, and a complete third signal can be obtained.

With reference to any one of the fifth to eighth possible implementation manners of the first aspect of the present application, in a ninth possible implementation manner of the first aspect of the present application, a length of the third signal may be a preset length known by the first network device, or may also indicate the length of the third signal through indication information in a second packet header before the third signal, or a pattern of the third signal may also indicate the length of the third signal, so that the first network device determines the length of the third signal, and it is ensured that the length of the first signal sent to the target network device is smaller than the length of the third signal.

In a second aspect, the present application provides another FD transmission method, where the FD transmission method specifically includes: the method comprises the steps that a first network device receives trigger information sent by a second network device, the trigger is used for triggering the first network device to send a first signal to a target network device, and the first signal is a training sequence used for self-interference channel estimation; then, the first network device sends a first signal to the target network device according to the trigger information, and the first network device may also receive a second signal, where the second signal is a signal received by the first network device through the self-interference channel; at this time, the first network device may obtain the state information of the self-interference channel according to the received first signal and the second signal, and the state information of the self-interference channel may be used for the first network device to perform self-interference cancellation in full-duplex FD transmission.

It can be understood that, through the triggering of the triggering information sent by the second network device, the first network device sends the first signal to the target network device before performing FD transmission, so that the state information of the self-interference channel can be acquired at this time by receiving the second signal returned from the self-interference channel after the first signal is sent out, so as to ensure that the first network device can perform accurate self-interference cancellation according to the state information of the self-interference channel in FD transmission.

With reference to the second aspect of the present application, in a first possible implementation manner of the second aspect of the present application, the first network device may carry the first signal in the acknowledgement signal sent to the target network device, and complete sending of the first signal; or, the first network device may also carry the first signal in the first PPDU packet sent to the target network device to complete the sending of the first signal, and this sending manner may save the sending of the additional signaling, thereby avoiding the overhead of an air interface, and being very beneficial to practical popularization and application.

With reference to the second aspect of the present application or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect of the present application, the trigger signal received by the first network device and sent by the second network device may specifically be a first PPDU packet of a specific type, or specifically may also be a second packet header in the second PPDU packet.

With reference to the second possible implementation manner of the second aspect of the present application, in a third possible implementation manner of the second aspect of the present application, when the trigger signal is specifically a second packet header in a second PPDU data packet, the second packet header may be used to indicate that the second PPDU data packet further includes a third signal after the second packet header, and at this time, the first network device may send the first signal to the target network device after receiving the second packet header and when receiving the third signal, so as to complete sending of the first signal in FD transmission.

With reference to the third possible implementation manner of the second aspect of the present application, in a fourth possible implementation manner of the second aspect of the present application, when the first network device receives the second signal, in which the first signal returns through the self-interference channel, the first network device also receives the third signal, that is, the first network device receives a fourth signal, in which the second signal and the third signal are superimposed together.

With reference to the fourth possible implementation manner of the second aspect of the present application, in a fifth possible implementation manner of the second aspect of the present application, the first network device may remove the third signal from the fourth signal, so as to obtain a remaining second signal, so as to perform self-interference channel estimation.

With reference to any one of the third to fifth possible implementation manners of the second aspect of the present application, in a sixth possible implementation manner of the second aspect of the present application, the first signal sent by the first network device to the target network device is smaller than the length of the third signal, so that the third signal can be easily and cleanly removed from the fourth signal, and a complete third signal can be obtained.

With reference to any one of the third to sixth possible implementation manners of the first aspect of the present application, in a seventh possible implementation manner of the second aspect of the present application, a length of the third signal may be a preset length known by the first network device, or the length of the third signal may also be indicated by indication information in a second packet header before the third signal, or a pattern of the third signal may also indicate the length of the third signal, so that the first network device determines the length of the third signal, and it is ensured that the length of the first signal sent to the target network device is smaller than the length of the third signal.

In a third aspect, the present application provides a FD transmission method, where the FD transmission method specifically includes: the method comprises the steps that a second network device sends trigger information to a first network device, the trigger information is used for triggering the first network device to carry out self-interference channel estimation, the second network device can receive a first signal sent by the first network device for carrying out self-interference channel estimation, the first signal is a training sequence for carrying out self-interference channel estimation, the first signal is used for enabling the first network device to obtain state information of a self-interference channel according to the first signal before FD transmission and a second signal which is sent out and received by the first network device through the self-interference channel, and the state information of the self-interference channel can be used for enabling the first network device to carry out self-interference elimination in full-duplex FD transmission.

It can be understood that the second network device sends the trigger information to the first network device, so that the first network device accurately obtains the state information of the self-interference channel before performing FD transmission, so as to ensure that the first network device can perform accurate self-interference cancellation according to the state information of the self-interference channel during FD transmission.

With reference to the third aspect of the present application, in a first possible implementation manner of the third aspect of the present application, the second network device may receive the first signal carried in the acknowledgement signal by receiving the acknowledgement signal sent by the first network device; or, the second network device may also receive the first signal carried in the first PPDU packet by receiving the first PPDU packet sent by the first network device. The receiving mode can save the receiving of extra signaling, thereby avoiding the air interface overhead and being very beneficial to the popularization and the application in practice.

With reference to the third aspect of the present application or the first possible implementation manner of the third aspect of the present application, in a second possible implementation manner of the third aspect of the present application, the trigger signal sent by the second network device to the first network device may specifically be a second PPDU packet of a specific type, or specifically may also be a second packet header in the second PPDU packet.

With reference to the second possible implementation manner of the third aspect of the present application, in a third possible implementation manner of the third aspect of the present application, when the trigger information is specifically a second packet header of a second PPDU data packet, the second packet header may be used to indicate that the second PPDU data packet further includes a third signal after the second packet header, and at this time, the receiving, by the second network device, the first signal sent by the first network device specifically includes: the second network device sends the third signal to the first network device, that is, when the first network device receives the third signal sent by the second network device, the second network device receives the first signal sent by the first network device.

With reference to the third possible implementation manner of the third aspect of the present application, in a fourth possible implementation manner of the third aspect of the present application, the first signal received by the second network device is smaller than the length of the third signal, so that the first network device can easily remove the third signal from the fourth signal cleanly and obtain a complete third signal. When the first network device receives the third signal, the first network device also receives a second signal that is a signal of the first signal and returns through the self-interference channel, that is, the first network device receives a fourth signal in which the second signal and the third signal are superimposed at this time, and the first network device may remove the third signal from the fourth signal, thereby obtaining the remaining second signal, so as to perform self-interference channel estimation.

With reference to the third or fourth possible implementation manner of the third aspect of the present application, in a fifth possible implementation manner of the third aspect of the present application, a length of the third signal may be a preset length known by the first network device, or the length of the third signal may also be indicated by indication information in a second packet header before the third signal, or a pattern of the third signal may also indicate the length of the third signal, so that the first network device determines the length of the third signal, and it is ensured that the length of the first signal received by the second network device is smaller than the length of the third signal.

In a fourth aspect, a first network device is provided, comprising:

a first obtaining unit, configured to obtain state information of a self-interference channel according to a first signal and a second signal, where the first signal is a training sequence for performing self-interference channel estimation, and the second signal is a signal received by a first network device through the self-interference channel by the first signal;

a transmission unit for performing FD transmission.

With reference to the fourth aspect of the present application, in a first possible implementation manner of the fourth aspect of the present application, the first network device further includes:

a transmitting unit, configured to transmit a first signal to a target network device;

and the first receiving unit is used for receiving the second signal.

With reference to the first possible implementation manner of the fourth aspect of the present application, in a second possible implementation manner of the fourth aspect of the present application, the sending unit is specifically configured to:

sending an acknowledgement signal to the target network device, the acknowledgement signal comprising a first signal;

or the like, or, alternatively,

and transmitting a first PPDU packet to the target network device, the first PPDU packet comprising a first signal.

With reference to the first or second possible implementation manner of the fourth aspect of the present application, in a third more possible implementation manner of the fourth aspect of the present application, the first network device further includes:

and the second receiving unit is used for receiving the trigger information sent by the second network equipment.

With reference to the third possible implementation manner of the fourth aspect of the present application, in a fourth possible implementation manner of the third aspect of the present application, when the trigger information is a second packet header of a second PPDU data packet, the second packet header is used to indicate that the second PPDU data packet further includes a third signal after the second packet header, and the sending unit is specifically configured to:

when the first network device receives the third signal, the first signal is sent to the target network device.

With reference to the fourth possible implementation manner of the fourth aspect of the present application, in a fifth possible implementation manner of the fourth aspect of the present application, the first receiving unit is specifically configured to:

a fourth signal is received, the fourth signal including the second signal and the third signal.

With reference to the fifth possible implementation manner of the fourth aspect of the present application, in a sixth possible implementation manner of the fourth aspect of the present application, the first network device further includes:

and the second acquisition unit is used for acquiring a second signal according to the third signal and the fourth signal.

In a fifth aspect, there is provided another first network device, comprising:

a first receiving unit, configured to receive trigger information sent by a second network device;

a sending unit, configured to send a first signal to a target network device, where the first signal is a training sequence used for performing self-interference channel estimation;

a second receiving unit, configured to receive a second signal, where the second signal is a signal received by the first network device through the self-interference channel from the first network device;

a first obtaining unit, configured to obtain, according to the first signal and the second signal, state information of a self-interference channel, where the state information of the self-interference channel is used for a first network device to perform self-interference cancellation in full-duplex FD transmission.

With reference to the fifth aspect of the present application, in a first possible implementation manner of the fifth aspect of the present application, the sending unit is specifically configured to:

or the like, or, alternatively,

With reference to the fifth aspect or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, when the trigger information is a second packet header of the second PPDU data packet, the second packet header is configured to indicate that the second PPDU data packet further includes a third signal after the second packet header, and the sending unit is specifically configured to:

With reference to the second possible implementation manner of the fifth aspect of the present application, in a third possible implementation manner of the fifth aspect of the present application, the second receiving unit is specifically configured to:

With reference to the third possible implementation manner of the fifth aspect of the present application, in a fourth possible implementation manner of the fifth aspect of the present application, the first network device further includes:

In a sixth aspect, the present application provides a second network device, comprising:

a sending unit, configured to send trigger information to a first network device;

the receiving unit is used for receiving a first signal sent by first network equipment;

the triggering information is used for triggering the first network to perform self-interference channel estimation, the first signal is a training sequence for performing self-interference channel estimation, and the first signal is used for acquiring state information of the self-interference channel according to the first signal before FD transmission by the first network device.

With reference to the sixth aspect of the present application, in a first possible implementation manner of the sixth aspect of the present application, the receiving unit is specifically configured to:

receiving an acknowledgement signal sent by a first network device, wherein the acknowledgement signal comprises a first signal;

or the like, or, alternatively,

and receiving a first PPDU packet sent by the first network equipment, wherein the first PPDU packet comprises a first signal.

With reference to the sixth aspect of the present application or the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect of the present application, when the trigger information is a second packet header of a second PPDU data packet, the second packet header is used to indicate that the second PPDU data packet further includes a third signal after the second packet header, and the receiving unit is specifically configured to:

and when the second network equipment sends the third signal to the first network equipment, receiving the first signal sent by the first network equipment.

In a seventh aspect, the present application provides a first network device, including:

a memory; and

a processor for reading program instructions stored in the memory to perform the following operations:

acquiring state information of a self-interference channel according to a first signal and a second signal, wherein the first signal is a training sequence for performing self-interference channel estimation, and the second signal is a signal received by first network equipment through the self-interference channel;

FD transmission is performed. The first network device may be a terminal device or a chipset; the memory may be integrated on the same chip as the processor or may be separately provided on different chips.

With reference to the seventh aspect of the present application, in a first possible implementation manner of the seventh aspect of the present application, the processor is further configured to read program instructions stored in the memory, so as to perform the following operations:

transmitting a first signal to a target network device;

a second signal is received.

With reference to the first possible implementation manner of the seventh aspect of the present application, in a second possible implementation manner of the seventh aspect of the present application, the processor is further configured to read program instructions stored in the memory, so as to perform the following operations:

or the like, or, alternatively,

With reference to the first or second possible implementation manner of the seventh aspect of the present application, in a third possible implementation manner of the seventh aspect of the present application, the processor is further configured to read program instructions stored in the memory to perform the following operations:

and receiving the trigger information sent by the second network equipment.

With reference to the third possible implementation manner of the seventh aspect of the present application, in a fourth possible implementation manner of the seventh aspect of the present application, when the trigger information is a second packet header of a second PPDU packet, the second packet header is used to indicate that the second PPDU packet further includes a third signal after the second packet header, and the processor is further configured to read a program instruction stored in the memory, so as to perform the following operations:

With reference to the fourth possible implementation manner of the seventh aspect of the present application, in a fifth possible implementation manner of the seventh aspect of the present application, the processor is further configured to read program instructions stored in the memory, so as to perform the following operations:

With reference to the fifth possible implementation manner of the seventh aspect of the present application, in a sixth possible implementation manner of the seventh aspect of the present application, the processor is further configured to read program instructions stored in the memory to perform the following operations:

and acquiring a second signal according to the third signal and the fourth signal.

In an eighth aspect, there is provided another first network device, including:

a memory; and

receiving trigger information sent by second network equipment;

sending a first signal to target network equipment, wherein the first signal is a training sequence used for self-interference channel estimation;

receiving a second signal, wherein the second signal is a signal received by the first network equipment through the self-interference channel;

and acquiring the state information of the self-interference channel according to the first signal and the second signal, wherein the state information of the self-interference channel is used for self-interference elimination of the first network equipment in full-duplex FD transmission.

The first network device may be a terminal device or a chipset; the memory may be integrated on the same chip as the processor or may be separately provided on different chips.

With reference to the eighth aspect of the present application, in a first possible implementation manner of the eighth aspect of the present application, the processor is further configured to read program instructions stored in the memory to perform the following operations:

or the like, or, alternatively,

With reference to the eighth aspect or the first possible implementation manner of the eighth aspect, in a second possible implementation manner of the eighth aspect, when the trigger information is a second packet header of the second PPDU packet, the second packet header is used to indicate that the second PPDU packet further includes a third signal after the second packet header, and the processor is further configured to read a program instruction stored in the memory, so as to perform the following operations:

With reference to the second possible implementation manner of the eighth aspect of the present application, in a third possible implementation manner of the eighth aspect of the present application, the processor is further configured to read program instructions stored in the memory to perform the following operations:

With reference to the third possible implementation manner of the eighth aspect of the present application, in a fourth possible implementation manner of the eighth aspect of the present application, the processor is further configured to read program instructions stored in the memory to perform the following operations:

In a ninth aspect, the present application provides a second network device, comprising:

a memory; and

sending trigger information to the first network equipment;

receiving a first signal sent by first network equipment;

The second network device may be a terminal device or a chipset; the memory may be integrated on the same chip as the processor or may be separately provided on different chips.

With reference to the ninth aspect of the present application, in a first possible implementation manner of the ninth aspect of the present application, the processor is further configured to read program instructions stored in the memory to perform the following operations:

or the like, or, alternatively,

With reference to the ninth aspect or the first possible implementation manner of the ninth aspect, in a second possible implementation manner of the ninth aspect, when the trigger information is a second packet header of the second PPDU packet, the second packet header is used to indicate that the second PPDU packet further includes a third signal after the second packet header, and the processor is further configured to read a program instruction stored in the memory, so as to perform the following operations:

In a tenth aspect, the present application provides a computer-readable storage medium having stored thereon a computer program comprising at least one piece of code executable by a computer to control the computer to perform the method as in the first aspect of the present application, the method in the possible implementation manner of the first aspect, the second aspect of the present application, the possible implementation manner of the second aspect, the third aspect of the present application, or the possible implementation manner of the third aspect.

In an eleventh aspect, the present application provides a computer program product comprising computer software instructions which, when run on the computer, cause the computer to perform the method as in the first aspect of the present application, the possible implementation of the first aspect, the method in the second aspect of the present application, the possible implementation of the second aspect of the present application, the method in the third aspect of the present application, or the possible implementation of the third aspect of the present application.

In a twelfth aspect, a processor is provided, comprising:

at least one circuit configured to perform the method according to the first aspect of the present application, the method according to the possible implementation manner of the first aspect, the method according to the second aspect of the present application, the possible implementation manner of the second aspect of the present application, and the method according to the third aspect of the present application, or the possible implementation manner of the third aspect.

The processor may be a chipset, among others.

Drawings

Fig. 1 is a diagram illustrating FD transmission according to an embodiment of the present application;

fig. 2 is a diagram illustrating another FD transmission in the present embodiment;

fig. 3 is a diagram illustrating an FD transmission according to an embodiment of the present application;

fig. 4 is a diagram illustrating scheduled FD transmission according to an embodiment of the present application;

fig. 5 is a diagram illustrating another scheduled FD transmission in an embodiment of the present application;

fig. 6 is a diagram illustrating an opportunistic FD transmission in an embodiment of the present application;

fig. 7 is a schematic flowchart illustrating an FD transmission method according to an embodiment of the present disclosure;

fig. 8 is a schematic flow chart illustrating another FD transmission method according to an embodiment of the present application;

fig. 9 is a schematic diagram illustrating an application of an FD transmission method according to an embodiment of the present application;

fig. 10 is a schematic flow chart illustrating another FD transmission method according to an embodiment of the present application;

fig. 11 is a schematic diagram illustrating an application of another FD transmission method according to an embodiment of the present application;

fig. 12 is a schematic flowchart illustrating an FD transmission method according to another embodiment of the present application;

fig. 13 is a schematic diagram illustrating an application of yet another FD transmission method in an embodiment of the present application;

fig. 14 is a schematic structural diagram of an FD trigger frame according to an embodiment of the present application;

FIG. 15 is a diagram illustrating a user notification domain in an embodiment of the present application;

fig. 16 is a schematic diagram illustrating an application of yet another FD transmission method in an embodiment of the present application;

fig. 17 is a schematic flowchart illustrating an FD transmission method according to another embodiment of the present application;

fig. 18 is a schematic diagram illustrating an application of yet another FD transmission method in an embodiment of the present application;

fig. 19 is a schematic structural diagram of a first network device in an embodiment of the present application;

fig. 20 is a schematic structural diagram of another first network device in the embodiment of the present application;

fig. 21 is a schematic structural diagram of a first network device according to another embodiment of the present application;

fig. 22 is a schematic structural diagram of a first network device according to another embodiment of the present application;

fig. 23 is a schematic structural diagram of a second network device in an embodiment of the present application;

fig. 24 is a schematic structural diagram of a first network device according to another embodiment of the present application;

fig. 25 is a schematic structural diagram of another second network device in this embodiment.

Detailed Description

First, before specifically describing the present application, a network device having FD capability related to the present application will be described.

In a conventional network device, a Half Duplex (HD) technology is generally used, that is, a network device with HD capability can only perform unidirectional transmission at the same time, and cannot transmit a signal in a receiving state or cannot receive a signal in a transmitting state.

In the proposed or adopted FD technique, a network device with FD capability can perform bidirectional transmission at the same time and the same frequency, and can transmit signals in a receiving state or receive signals in a transmitting state, thereby improving the utilization efficiency of network resources.

Next, the following will be introduced about the self-interference channel, self-interference channel estimation, and self-interference cancellation related contents in the present application.

The network device mentioned in the present application should be understood as any AP or STA, and in practical applications, may be specifically considered as any network device such as a communication server, a router, a switch, a bridge, a computer, or a mobile phone, which can perform data transmission through a communication network.

It should be understood that for ease of understanding and distinction, the AP and the STA are used in the embodiments of the present application to represent different network devices.

As shown in fig. 1, when an AP with FD capability performs FD transmission, a signal sent by a sending end of the AP will be distorted through an air interface and a circuit, and finally, the signal returns to a receiving end of the AP to be received by the AP.

It is worth mentioning that the problem of self-interference channel interference is more pronounced in wireless transmission than in wired transmission, for example in WLAN the problem of self-interference channel is more serious and more interesting.

It is easy to understand that compared with HD transmission, the interference of self-interference channel is avoided through the characteristic of unidirectional transmission, and in FD transmission, the network device performs self-interference cancellation at its receiving end, thereby ensuring accurate reception of the required signal.

Specifically, the network device may send an X1 signal to the outside, receive an X2 signal returned from the interference channel after the X1 signal is sent out, perform self-interference channel estimation at this time, and obtain H_SIX2/X1, this H_SIThe network device estimates the state information of the self-interference channel according to the H_SISelf-interference cancellation is performed.

In practical applications, the training sequence may specifically be a Long Training Field (LTF) in a PPDU packet, and of course, the training sequence may also be other signals known to a network device, which is not limited herein.

Self-interference cancellation is generally achieved by the cooperation of cancellation circuits in three stages, namely radio frequency, analog and digital, according to the acquired state information of a self-interference channel. Generally, the configuration of the radio frequency and analog cancellation circuits is relatively fixed, mainly dealing with the channel characteristics that change slowly with time, when the network device is started, the parameter configuration of the cancellation circuit can be completed through one-time adjustment, or the configuration can be completed through one-time adjustment within a long time; the digital cancellation circuit is mainly used for tracking channel characteristics which change rapidly along with time, such as multipath effect of a self-interference channel, and further eliminating residual self-interference signals in radio frequency and analog stages.

Next, different application scenarios related to FD transmission will be introduced.

As shown in fig. 1, in the FD transmission scenario of a single AP, only the AP has FD capability, and the AP receives a PPDU packet sent by STA2, and simultaneously the AP sends another PPDU packet to STA 1;

or, as another FD transmission diagram shown in fig. 2, in a bidirectional FD transmission scenario, both the AP and the STA have FD capabilities, and at this time, bidirectional FD transmission is performed between the AP and the STA simultaneously, that is, one side of the AP sends a first PPDU packet to the STA and receives a second PPDU packet sent by the STA, and the other side of the STA sends the second PPDU packet and receives the first PPDU packet sent by the AP;

alternatively, as another FD transmission diagram shown in fig. 3, in a multi-user FD transmission scenario, where multiple STAs are involved, the AP not only performs bidirectional FD transmission with the STA1, but also simultaneously receives a PPDU packet sent by the receiving STA2 and sends another PPDU packet to the STA1, where the multi-user FD scenario may be implemented by a multi-user multi-input multi-output (MU-MIMO) or Orthogonal Frequency Division Multiple Access (OFDMA) application, which is not described herein in detail.

Then, on the basis of the different application scenarios related to the FD transmission, different initiating methods related to the FD transmission are introduced.

As shown in fig. 4, a scheduled FD transmission scheme is that an AP may perform synchronous FD transmission by sending a Request To Send (RTS) signal to one or more STAs, and after receiving the RTS signal, the STAs feed back a Clear To Send (CTS) signal;

alternatively, as another scheduled FD transmission diagram shown in fig. 5, the AP performs synchronous FD transmission by sending an FD trigger (trigger) frame to the STA, that is, on one hand, the AP receives a PPDU packet sent by the STA1, and sends another PPDU packet to the STA 2;

alternatively, as shown in fig. 6, in an opportunistic FD transmission scheme, when receiving a PPDU packet sent by the STA1, the AP sends another PPDU packet to the STA2 if an FD transmission condition is triggered, so as to perform asynchronous FD transmission.

However, in practical applications, it is found that although the different initiating methods of FD transmission all specify how to perform self-interference channel estimation and self-interference cancellation, they are not perfect enough and have corresponding defects, which finally affects accurate PPDU packet reception.

For example, in the FD transmission initiated by the RTS/CTS signal corresponding to fig. 4, although the RTS and CTS signals are known signals for both, both can perform corresponding self-interference channel estimation when sending out the RTS signal or the CTS signal. However, it should be noted that after the AP or the STA contends for the channel between the AP and the STA, the AP or the STA does not necessarily need to occupy the channel through the RTS/CTS signal, and in practical applications, the AP or the STA may directly send the PPDU data packet and perform FD transmission, and at this time, there is no RTS signal and no CTS signal to perform corresponding self-interference channel estimation, so that self-interference cancellation cannot be achieved in FD transmission.

Meanwhile, it can be understood that the RTS signal and the CTS signal still occupy a certain air interface time, which may reduce FD transmission efficiency; and if the AP and multiple STAs perform multi-user FD transmission, the self-interference channel estimation method implemented by the RTS signal and the CTS signal cannot ensure that each STA completes self-interference channel estimation before FD transmission.

For another example, in the FD transmission initiated by the FD trigger frame corresponding to fig. 5, the AP may implement self-interference channel estimation by using the FD trigger frame, and if the STA1 has FD capability, before the FD transmission, the STA1 does not send a known signal to the outside, and fails to complete the self-interference channel estimation, so that the STA1 cannot implement self-interference cancellation in the FD transmission, and this scenario is obviously only suitable for the AP having FD capability.

For another example, in opportunistic FD transmission corresponding to fig. 6, the STA1 may carry a training sequence in the header of the first PPDU packet sent to the AP to achieve self-interference channel estimation, and when the AP initiates FD transmission when the FD transmission condition is satisfied, the AP sends the second PPDU packet to the STA2 to form FD transmission, but the AP does not carry a training sequence in the header of the second PPDU packet, which means that the AP fails to perform self-interference channel estimation.

If the AP carries the training sequence X1 in the header of the second PPDU packet sent to the STA2, at this time, the AP receives the signal X2 returned from the training sequence, and the X2 also overlaps the first PPSU packet Y sent by the STA1, and if the aforementioned H is applied_SISelf-interference channel estimation using the formula X1/X2 results in H being obtained_SITo (X2+ Y)/X1, obviously, this directly means that the AP does not perform accurate self-interference channel estimation and self-interference cancellation cannot be performed accurately in FD transmission.

As can be seen, in the above-mentioned FD transmission, the AP or the STA does not perform completely accurate self-interference channel estimation before performing FD transmission, so that the state information of the self-interference channel cannot be obtained accurately, and the PPDU packet cannot be received accurately because the self-interference cancellation cannot be performed accurately in the FD transmission.

Finally, it should be noted that the AP and the STA in fig. 1 to 6 are only schematic, and in practical application, the AP and the STA may be exchanged arbitrarily, and should be understood as any network device having a communication relationship, and are not limited herein. It is to be understood that the following descriptions related to AP and STA application diagrams may refer to the description herein, and are not repeated herein.

The FD transmission method and the related equipment provided by the application are used for accurately acquiring the state information of the self-interference channel before the network equipment carries out FD transmission so as to ensure that the network equipment can carry out accurate self-interference elimination according to the state information of the self-interference channel in the FD transmission.

Specifically, first, as shown in fig. 7, a flow diagram of an FD transmission method is described in detail as follows:

optionally, in step 701, the first network device receives trigger information sent by the second network device;

in the presetting, when the first network device receives any first PPDU data packet sent by the second network device, the first network device recognizes that the trigger information is received; or, when the first PPDU packet is in a preset PPDU packet format, the first network device recognizes that the trigger information is received; or, when the first PPDU data packet carries the indication information, the first network device recognizes that the trigger information is received, which is understood and not limited herein.

Step 702, a first network device sends a first signal to a target network device;

after receiving the trigger information, the first network device triggers sending a first signal to the target network device, where the first signal is a training sequence for performing self-interference channel estimation, and the training sequence is described in the foregoing, and is not described herein again specifically.

It should be understood that the target network device may be not only other network devices, but also a second network device in practical applications if a certain condition is met. When the target network device is a second network device, the first network device feeds back the first signal to the second network device after receiving the trigger information sent by the second network device.

Step 703, the first network device receives a second signal;

after the first network device sends the first signal to the target network device, the first network device may receive the second signal, that is, the first signal is received by the receiving end of the first network device through the self-interference channel.

Step 704, the first network device obtains the state information of the self-interference channel according to the first signal and the second signal;

after the first signal and the second signal are obtained, the first network device can perform self-interference channel estimation and accurately obtain the state information of the self-interference channel.

Step 705, the first network device performs FD transmission.

After the state information of the self-interference channel is acquired, the first network device meets the necessary conditions of FD transmission, and FD transmission can be performed when other FD transmission conditions are met.

It can be understood that if the second network device has FD capability, the first network device may perform FD transmission with the second network device; or, if the target network device has the FD capability, the first network device may also perform FD transmission with the target network device; as another alternative, the first network device may also perform FD transmission with two network devices without FD capability as shown in fig. 1, which is not limited herein. It is also understood that embodiments of the present application may include more or fewer steps.

Meanwhile, it should be noted that, in the FD transmission performed in step 705, the first network device does not necessarily need to perform self-interference cancellation according to the state information of the self-interference channel acquired in step 704, in this application, the acquired state information of the self-interference channel is only a necessary condition for the first network device to perform FD transmission, and if the necessary condition is not satisfied, the first network device cannot perform FD transmission; when the requirement is satisfied, the first network device may perform FD transmission according to the trigger of other FD transmission conditions.

Of course, after the state information of the self-interference channel is obtained, the first network device may perform self-interference cancellation according to the obtained state information of the self-interference channel in FD transmission, so as to achieve accurate PPDU packet reception.

In this embodiment of the present application, the first network device accurately obtains the state information of the self-interference channel before performing FD transmission, so as to ensure that the network device can perform accurate self-interference cancellation according to the state information of the self-interference channel during FD transmission.

In practical application, the present application may further optimize, where the first PPDU packet may be set to different types according to different uses, specifically, for example, a data frame for transmitting larger byte data and an FD trigger frame for triggering FD transmission, and correspondingly, if the first network device receives the first PPDU packet of a specific type, the first network device may identify as receiving the trigger information; or, the first PPDU data packet may further carry third information for performing self-interference channel estimation, and the first packet header of the first PPDU data packet indicates that the third information exists after the first packet header of the first PPDU data packet, at this time, when the first network device receives the first packet header, the first network device may recognize that the trigger information is received, and perform corresponding self-interference channel estimation according to the third information. The following description is made one by one.

A, data frame

Fig. 8 shows a flow chart of another FD transmission method, and fig. 9 shows an application diagram of the FD transmission method, which are detailed as follows:

step 801, a first network device receives a data frame sent by a second network device;

it can be understood that the trigger information may specifically be a data frame sent by the second network device, where the data frame may carry related data such as a picture, a video, and the like with a larger byte.

Step 802, a first network device sends a confirmation signal to a second network device;

after receiving the trigger information sent by the second network device, the first network device may reply an Acknowledgement (ACK) frame to the second network device to indicate that the data frame has been received, and the ACK frame carries the first signal, where the second network device may be understood as the target network device.

Of course, the first network device may also send an acknowledgement signal carrying the first signal to other network devices, which is not limited herein.

Step 803, the first network device receives a second signal;

after the first network device sends an acknowledgement signal carrying the first signal to the target network device, the first network device may receive the second signal, that is, a signal received by a receiving end of the first network device through a self-interference channel from the first signal in the acknowledgement signal.

Step 804, the first network device obtains the state information of the self-interference channel according to the first signal and the second signal;

step 805, the first network device performs FD transmission.

It is understood that step 804 and step 805 may refer to step 704 and step 705 corresponding to fig. 7, and detailed description thereof is omitted here.

In addition, it should be noted that the second network device may carry a training sequence in a packet header of the sent data frame, and perform corresponding self-interference channel estimation according to the training sequence to obtain state information of the corresponding self-interference channel.

In this embodiment of the present application, after receiving a data frame sent by a second network device, a first network device may carry a first signal in a reply acknowledgement signal, so that a second signal may be received, and perform self-interference channel estimation before FD transmission to obtain state information of a self-interference channel.

It can be understood that the configuration directly overcomes the defects of the self-interference channel estimation mode depending on the RTS signal and the CTS signal and the self-interference channel estimation mode in the opportunistic FD transmission, and meanwhile, the acknowledgement signal in the acknowledgement signal reply mechanism can be used, thereby saving the sending of extra signaling, avoiding the overhead of an air interface, and being very beneficial to practical popularization and application. It is also understood that embodiments of the present application may include more or fewer steps.

Second, FD trigger frame

Fig. 10 shows a flow chart of another FD transmission method, and fig. 11 shows an application diagram of another FD transmission method, which are detailed as follows:

1001, a first network device receives an FD trigger frame sent by a second network device;

it can be understood that the trigger information may specifically be an FD trigger frame sent by the second network device, where the FD trigger frame is used to trigger the first network device to perform FD transmission with the second network device at a preset time.

Step 1002, a first network device sends a confirmation signal;

step 1003, the first network device receives a second signal;

step 1004, the first network device obtains state information of a self-interference channel according to the first signal and the second signal;

it is understood that steps 1002 to 1004 may refer to steps 802 to 804 corresponding to fig. 8, and are not described herein again in detail.

Step 1005, the first network device performs FD transmission.

After the state information of the self-interference channel is obtained, the first network device can perform FD transmission with the second network device at a preset time.

In addition, it should be noted that the second network device may carry a training sequence in a packet header in the sent FD trigger frame, and perform corresponding self-interference channel estimation according to the training sequence to obtain state information of the corresponding self-interference channel.

In this embodiment of the present application, after receiving an FD trigger frame sent by a second network device, a first network device replies an acknowledgement signal carrying a first signal, so that the second signal can be received, and performs self-interference channel estimation before FD transmission to obtain state information of a self-interference channel.

It can be understood that the configuration directly overcomes the defect of the self-interference channel estimation manner in FD transmission initiated by the FD trigger frame, so that the first network device having FD capability and being triggered by the FD trigger frame to perform FD transmission can obtain the state information of the self-interference channel, and when performing FD transmission with the second network device, self-interference cancellation can be accurately achieved.

As also shown in fig. 12, a flow diagram of another FD transmission method and an application diagram of another FD transmission method shown in fig. 13 are detailed as follows:

step 1201, a first network device receives an FD trigger frame sent by a second network device;

Step 1202, the first network device sends a second packet header to the second network device at a preset time;

after receiving the FD trigger frame, the first network device may obtain a preset time for performing FD transmission according to the FD trigger frame, and send a second packet header of a second PPDU data packet to the second network device before the preset time, where the second packet header carries a first signal, and a time when sending of the second packet header is completed may be the preset time.

Step 1203, the first network device receives a second signal;

after the first network device sends a second packet header carrying the first signal to the second network device, the first network device may receive the second signal, that is, the first signal in the second packet header is received by the receiving end of the first network device through the self-interference channel.

Step 1204, the first network device obtains state information of the self-interference channel according to the first signal and the second signal;

it is understood that step 1204 may refer to step 804 corresponding to fig. 8, and details thereof are not described herein.

Step 1205, the first network device performs FD transmission with the second network device at a preset time.

It can be understood that, at the preset time, the first network device continues to send, to the second network device, the remaining unsent second physical layer service data unit (PSDU) packets of the second PPDU packet, and receives the third PPDU packet sent by the first network device at the same time.

In this embodiment of the present application, after receiving an FD trigger frame sent by a second network device, that is, before a preset time for FD transmission, a first network device sends a second packet header carrying a first signal to the first network device, so that the first network device may receive a second signal, perform self-interference channel estimation before the preset time for FD transmission, obtain state information of a self-interference channel, and perform FD transmission with the second network device at the preset time.

Meanwhile, compared with the embodiments corresponding to fig. 10 and fig. 11, the configuration not only provides another practical application mode, but also further saves the sending of additional signaling, and avoids air interface overhead, thereby facilitating practical popularization and application.

In addition, it is worth mentioning that, in the embodiment of the present application, the first network device may indicate, in the FD trigger frame, a behavior for the FD trigger frame, for example, whether to reply an acknowledgement signal carrying the first signal, whether to send a second packet header carrying the first signal before a preset time, whether to receive a third PPDU packet sent by the second network device at the preset time, and the like, where the specific indicated behavior is not limited herein. The setting may be defined in a user notification signaling field in the FD trigger frame, and specifically refer to the structural diagram of the FD trigger frame shown in fig. 14 and the user notification domain diagram shown in fig. 15.

Of course, in this embodiment of the application, the behavior of the first network device for the FD trigger frame may also be preset locally in the first network device, and is not limited herein specifically.

In addition, in practical applications, as shown in fig. 15, an application diagram of another FD transmission method is shown, where the FD STA1, the FD STA2, and the FD STAs represent a plurality of different first network devices, and the FD AP represents a second network device, and the embodiment of the present application is also applicable to FD transmission initiated by an FD trigger frame of multiple users, where the second network device may send the FD trigger frame to the multiple network devices simultaneously through MU-MIMO or OFDMA to initiate FD transmission of multiple users, and the multiple different first network devices receiving the FD trigger frame may send an acknowledgement signal carrying a first signal or a second packet header carrying the first signal to the second network devices respectively through other multiple access manners such as MU-MIMO, OFDMA, or time-division multiple access (TDMA), so as to implement accurate self-interference channel estimation before performing FD transmission at a preset time, state information of a self-interference channel is acquired.

Through the arrangement, a more specific application mode is provided for the embodiment of the application, so that the popularization and the application in practice are facilitated. It is also understood that embodiments of the present application may include more or fewer steps.

Third, the first bag head

Fig. 17 shows a flow chart of another FD transmission method, and fig. 18 shows an application diagram of another FD transmission method, which are detailed as follows:

step 1701, the first network device receives a first packet header of a first PPDU data packet sent by the second network device;

the first packet header may indicate that the first PPDU packet further includes third information after the first packet header, where the third information is known to the first network device, and it is understood that the second network device may insert a third signal in the first PPDU packet, so that the first network device performs the following steps.

Step 1702, when the first network device receives the third signal, the first network device sends a first signal to the target network device;

it can be understood that when the first network device receives the first packet header, it may be known that the first PPDU packet has the third information after the first packet header, and when the first network device receives the third signal of the first PPDU packet after the first packet header, the first network device may send the first signal to the target network device.

It should be understood that, at this time, the first network device sends the first signal to the target network device, similar to the above embodiment, the first signal may be carried not only in the acknowledgement signal, but also in the second header of the second PPDU packet, and details thereof are not described herein again.

Step 1703, the first network device receives a fourth signal;

wherein the fourth signal comprises the second signal and the third signal.

It will be appreciated that since the first network device receives the third signal at the same time as the second signal, the first network device now receives the fourth signal, i.e. the second signal and the third signal are superimposed.

Step 1704, the first network device acquires a second signal according to the third signal and the fourth signal;

as will be readily appreciated, since the third signal is known to the first network device, the first network device may remove the third signal from the fourth signal to obtain the remaining second signal.

Specifically, for example, when the first network device receives the second signal X2, where the first signal X1 returns through the self-interference channel, the third signal Y is further superimposed on the X2, that is, the received fourth signal Z ═ X2+ Y, at this time, the first network device may remove the third signal from the fourth signal, and accurately acquire the second signal, that is, X2 ═ Z-Y.

It should be noted here that, if the length of the first signal is smaller than the length of the third signal, the first network device may easily remove the third signal from the fourth signal, and obtain a complete third signal, so as to further accurately perform self-interference channel estimation and obtain state information of the self-interference channel.

Correspondingly, the length of the third signal may be a preset length known by the first network device; or, the first packet header of the first PPDU packet may further be provided with indication information so as to inform the first network device of the length of the third signal; still alternatively, the length of the third signal may be indicated by a pattern of the third signal, and correspondingly, the first network device may detect the pattern of the third signal by autocorrelation detection, cross-correlation detection, waveform detection, and the like to determine the length of the third signal.

Step 1705, the first network device obtains state information of the self-interference channel according to the first signal and the second signal;

it is understood that step 1605 may refer to step 804 corresponding to fig. 8, and is not described herein in detail.

At step 1706, the first network device performs FD transmission.

It is to be understood that, as shown in fig. 18, the first network device may continue to receive the first PSDU packet in the first PPDU packet after the third signal, and simultaneously transmit the second PSDU packet in the second PPDU packet to the target network device, and of course, in practical applications, the time when the first network device transmits the second PSDU packet to the target network device may also be before receiving the first PSDU packet, which is determined by the lengths of the third signal and the second packet header, and is not limited herein.

In addition, it should be noted that the second network device may carry a training sequence in the sent first packet header, and perform corresponding self-interference channel estimation according to the training sequence to obtain state information of the corresponding self-interference channel.

In this embodiment of the present application, when the first network device receives the first packet header sent by the second network device and receives the third signal after the first packet header, the first network device sends the first signal to the target network device at the same time, so that a fourth signal including the second signal and the third signal can be obtained, the third signal is removed from the fourth signal, and the clean second signal is obtained, so that the self-interference channel estimation can be accurately performed, and the state information of the self-interference channel is obtained.

It can be understood that this setting directly overcomes the above-mentioned defects that the self-interference channel estimation mode that relies on the RTS signal and the CTS signal to perform and the self-interference channel estimation mode in the opportunistic FD transmission respectively have, and meanwhile, in any FD transmission, accurate state information of the self-interference channel can be obtained first, which not only saves the sending of extra signaling and avoids the overhead of air interfaces, but also does not need to wait for the occupied time of the acknowledgement signal carrying the first signal in the above-mentioned embodiment, and FD transmission can be implemented more efficiently, thereby being more favorable for popularization and application in practice. It is also understood that embodiments of the present application may include more or fewer steps.

Next, as shown in fig. 19, a schematic structural diagram of a first network device, a first network device 1900 specifically includes:

a first obtaining unit 1901, configured to obtain state information of a self-interference channel according to a first signal and a second signal, where the first signal is a training sequence for performing self-interference channel estimation, and the second signal is a signal received by a first network device through the self-interference channel by the first signal;

a transmission unit 1902 is configured to perform FD transmission.

Further, as another schematic structural diagram of the first network device shown in fig. 20, in another possible implementation manner, the first network device 1900 further includes:

a transmitting unit 1903, configured to transmit a first signal to a target network device;

a first receiving unit 1904, configured to receive the second signal.

Further, in another possible implementation manner, the sending unit 1903 is specifically configured to:

or the like, or, alternatively,

Further, in yet another possible implementation manner, as shown in fig. 20, the first network device 1900 further includes:

a second receiving unit 1905, configured to receive trigger information sent by the second network device.

Further, in another possible implementation manner, when the trigger information is a second packet header of the second PPDU data packet, the second packet header is used to indicate that the second PPDU data packet further includes a third signal after the second packet header, and the sending unit 1903 is specifically configured to:

when first network device 1900 receives the third signal, the first signal is transmitted to the target network device.

Further, in another possible implementation manner, the first receiving unit 1904 is specifically configured to:

a second obtaining unit 1906, configured to obtain a second signal according to the third signal and the fourth signal.

Next, as another schematic structural diagram of the first network device shown in fig. 21, the first network device 2100 specifically includes:

a first receiving unit 2101, configured to receive trigger information sent by a second network device;

a sending unit 2102, configured to send a first signal to a target network device, where the first signal is a training sequence used for performing self-interference channel estimation;

a second receiving unit 2103, configured to receive a second signal, where the second signal is a signal received by the first network device through the self-interference channel;

a first obtaining unit 2104, configured to obtain, according to the first signal and the second signal, state information of a self-interference channel, where the state information of the self-interference channel is used by the first network device to perform self-interference cancellation in full-duplex FD transmission.

Further, in a possible implementation manner, the sending unit 2102 is specifically configured to:

or the like, or, alternatively,

Further, in another possible implementation manner, when the trigger information is a second header of the second PPDU packet, the second header is used to indicate that the second PPDU packet further includes a third signal after the second header, and the sending unit 2102 is specifically configured to:

when the first network device 2100 receives the third signal, the first signal is transmitted to the target network device.

Further, in another possible implementation manner, the second receiving unit 2103 is specifically configured to:

Further, in yet another possible implementation manner, as shown in fig. 22, in yet another schematic structural diagram of the first network device 2100, the first network device 2100 further includes:

a second obtaining unit 2105 is configured to obtain the second signal according to the third signal and the fourth signal.

Then, as shown in fig. 23, which is a schematic diagram of a structure of the second network device, the second network device 2300 includes:

a sending unit 2301, configured to send trigger information to a first network device;

a receiving unit 2302, configured to receive a first signal sent by a first network device;

Further, in a possible implementation manner, the receiving unit 2302 is specifically configured to:

or the like, or, alternatively,

Further, in another possible implementation manner, when the trigger information is a second packet header of the second PPDU packet, the second packet header is used to indicate that the second PPDU packet further includes a third signal after the second packet header, and the receiving unit 2302 is specifically configured to:

when the second network device 2300 transmits the third signal to the first network device, the first signal transmitted by the first network device is received.

It is easy to see that the foregoing describes the embodiments of the present application from the perspective of a modular functional entity, and the following describes the embodiments of the present application from the perspective of hardware processing.

First, as shown in fig. 24, which is a schematic structural diagram of the first network device, as shown in fig. 24, the first network controller may include one or more processors 2401, memories 2402, and communication interfaces 2403.

The first network device may be a terminal device or a chipset; the memory 2402 may be integrated with the processor 2401 on the same chip, or may be separately provided on different chips. The processor 2401, the memory 2402, and the communication interface 2403 are connected to each other by a bus 2404. The bus 2404 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 24, but this does not mean only one bus or one type of bus.

The communication interface 2403 may be a wired communication interface, such as an ethernet interface, a wireless communication interface, or a combination thereof. The ethernet interface may be an optical interface, an electrical interface, or a combination thereof. The wireless communication interface may be a WLAN interface, a cellular network communication interface, a combination thereof, or the like.

Memory 2402 may include volatile memory (volatile memory), such as random-access memory (RAM); the memory 2402 may also include a non-volatile memory (non-volatile memory), such as a flash memory (flash memory), a Hard Disk Drive (HDD), or a solid-state drive (SSD); the memory 2402 may also include a combination of the above types of memories.

The processor 2401 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP. The processor 2401 may also 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.

Optionally, the memory 2402 is further configured to store program instructions, and the processor 2401 calls the program instructions stored in the memory 2402 to perform the operations performed by the first network device in any method embodiment shown in fig. 7 to 13, and in fig. 16 to 18.

Next, as an architectural diagram of the second network device shown in fig. 25, the second network device 2500 may include one or more processors 2501, memories 2502, and communication interfaces 2503.

The second network device may be a terminal device or a chipset; the memory 2502 may be integrated with the processor 2501 on the same chip or may be provided on different chips.

The processor 2501, the memory 2502, and the communication interface 2503 are connected to each other via a bus 2504. The bus 2504 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 25, but it is not intended that there be only one bus or one type of bus.

The communication interface 2503 may be a wired communication interface, such as an ethernet interface, a wireless communication interface, or a combination thereof. The ethernet interface may be an optical interface, an electrical interface, or a combination thereof. The wireless communication interface may be a WLAN interface, a cellular network communication interface, a combination thereof, or the like.

Memory 2502 may include volatile memory, such as RAM; the memory 2502 may also include a nonvolatile memory such as a flash memory, an HDD, or an SSD; the memory 2502 may also comprise a combination of the above-described types of memory.

The processor 2501 may be a CPU, an NP, or a combination of a CPU and an NP. The processor 2501 may also include a hardware chip. The hardware chip may be an ASIC, PLD, or a combination thereof. The PLD may be a CPLD, an FPGA, a GAL, or any combination thereof.

Optionally, the memory 2502 is further configured to store program instructions, and the processor 2501 calls the program instructions stored in the memory 2502 to perform the operations performed by the second network device in any method embodiment shown in fig. 7 to 13, and in fig. 16 to 18.

The present application further provides a computer-readable storage medium storing a computer program, where the computer program includes at least one code, where the at least one code is executable by a computer to control the computer to perform the method as shown in fig. 7 to 13, and fig. 16 to 18 correspond to any method embodiment performed by the first network device or the second network device.

The present application also provides a computer program product comprising computer software instructions that, when run on the computer, cause the computer to perform the method as performed by the first network device or the second network device in any of the method embodiments of fig. 7-13, and 16-18.

The present application further provides a processor comprising at least one circuit configured to perform a method as performed by the first network device or the second network device in any of the method embodiments of fig. 7-13, and fig. 16-18.

The processor may be a chipset, among others.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the first network device, the second network device and the related units thereof described above may refer to the corresponding processes in any method embodiments of fig. 7 to 13 and fig. 16 to 18, and are not repeated herein.

In the several embodiments provided in the present application, it should be understood that the disclosed first network device, second network device and related units, and FD transmission 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: various media that can store program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a RAM, a magnetic disk, or an optical disk.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A full duplex FD transmission method is characterized by comprising the following steps:

the first network equipment receives trigger information sent by second network equipment, wherein the trigger information comprises a second PPDU data packet or a second packet header of the second PPDU data packet;

the first network equipment sends the first signal to target network equipment;

the first network device receiving the second signal;

the method comprises the steps that a first network device obtains state information of a self-interference channel according to a first signal and a second signal, wherein the first signal is a training sequence for self-interference channel estimation, and the second signal is a signal received by the first network device through the self-interference channel;

the first network device performs FD transmission;

when the trigger information is the second packet header, the second packet header is used to indicate that the second PPDU data packet further includes a third signal after the second packet header, and the sending, by the first network device, the first signal to the target network device includes:

when the first network device receives the third signal, the first network device sends the first signal to the target network device.

2. The FD transmission method of claim 1, wherein the first network device sending the first signal to a target network device comprises:

the first network device sends an acknowledgement signal to the target network device, wherein the acknowledgement signal comprises the first signal;

or the like, or, alternatively,

the first network device sends a first physical layer protocol data unit (PPDU) data packet to the target network device, wherein the first PPDU data packet comprises the first signal.

3. The FD transmission method of claim 1, wherein the first network device receiving the second signal comprises:

the first network device receives a fourth signal, the fourth signal comprising the second signal and the third signal.

4. The FD transmission method of claim 3, wherein before the first network device obtains the status information of the self-interference channel according to the first signal and the second signal, the method further comprises:

and the first network equipment acquires the second signal according to the third signal and the fourth signal.

5. The FD transmission method of claim 3 or 4, wherein the length of the first signal is smaller than the third signal.

6. The FD transmission method of claim 3 or 4, wherein the length of the third signal is indicated by a first packet header or a pattern of the third signal.

7. A full duplex FD transmission method is characterized by comprising the following steps:

the method comprises the steps that a second network device sends triggering information to a first network device, wherein the triggering information comprises a second PPDU data packet or a second packet header of the second PPDU data packet;

the second network equipment receives a first signal sent by the first network equipment;

the trigger information is used to trigger the first network to perform self-interference channel estimation, the first signal is a training sequence for performing the self-interference channel estimation, and the first signal is used by the first network device to obtain state information of a self-interference channel according to the first signal before FD transmission;

when the trigger information is the second packet header, the second packet header is used to indicate that the second PPDU data packet further includes a third signal after the second packet header, and the receiving, by the second network device, the first signal sent by the first network device includes:

when the second network device sends the third signal to the first network device, the second network device receives the first signal sent by the first network device.

8. The FD transmission method of claim 7, wherein the second network device receiving the first signal sent by the first network device comprises:

the second network equipment receives an acknowledgement signal sent by the first network equipment, wherein the acknowledgement signal comprises the first signal;

or the like, or, alternatively,

and the second network equipment receives a first physical layer protocol data unit (PPDU) data packet sent by the first network equipment, wherein the first PPDU data packet comprises the first signal.

9. The FD transmission method of claim 7, wherein the length of the first signal is smaller than the third signal.

10. The FD transmission method of claim 7 or 9, wherein a length of the third signal is indicated by a first packet header or a pattern of the third signal.

11. A first network device, comprising:

a second receiving unit, configured to receive trigger information sent by a second network device;

a transmitting unit, configured to transmit the first signal to a target network device;

a first receiving unit, configured to receive the second signal;

a first obtaining unit, configured to obtain state information of a self-interference channel according to a first signal and a second signal, where the first signal is a training sequence for performing self-interference channel estimation, and the second signal is a signal received by the first network device through the self-interference channel by the first signal;

a transmission unit configured to perform FD transmission;

when the trigger information is a second packet header of a second PPDU data packet, the second packet header is configured to indicate that the second PPDU data packet further includes a third signal after the second packet header, and the sending unit is specifically configured to:

12. The first network device of claim 11, wherein the sending unit is specifically configured to:

transmitting an acknowledgement signal to the target network device, the acknowledgement signal comprising the first signal;

or the like, or, alternatively,

and sending a first physical layer protocol data unit (PPDU) data packet to the target network device, wherein the first PPDU data packet comprises the first signal.

13. The first network device of claim 11, wherein the first receiving unit is specifically configured to:

receiving a fourth signal, the fourth signal comprising the second signal and the third signal.

14. The first network device of claim 13, wherein the first network device further comprises:

and a second obtaining unit, configured to obtain the second signal according to the third signal and the fourth signal.

15. A second network device, comprising:

a receiving unit, configured to receive a first signal sent by the first network device;

when the trigger information is a second packet header of a second PPDU data packet, the second packet header is configured to indicate that the second PPDU data packet further includes a third signal after the second packet header, and the receiving unit is specifically configured to:

when the second network device sends the third signal to the first network device, receiving the first signal sent by the first network device.

16. The second network device of claim 15, wherein the receiving unit is specifically configured to:

receiving an acknowledgement signal sent by the first network device, wherein the acknowledgement signal comprises the first signal;

or the like, or, alternatively,

receiving a first physical layer protocol data unit (PPDU) data packet sent by the first network device, where the first PPDU data packet includes the first signal.