WO2016041137A1

WO2016041137A1 - Out-of-band full duplex-based data transmission method, access point, and station

Info

Publication number: WO2016041137A1
Application number: PCT/CN2014/086595
Authority: WO
Inventors: 刘晟
Original assignee: 华为技术有限公司
Priority date: 2014-09-16
Filing date: 2014-09-16
Publication date: 2016-03-24

Abstract

Disclosed in the present invention are an out-of-band full duplex-based data transmission method, an access point, and a station. The method comprises: sending scheduling information to a first station over a first channel, said scheduling information being used for scheduling the first station to send an uplink data frame; in a first time period after sending said scheduling information, acquiring self-interference channel estimation information of the first channel; on the basis of the self-interference channel estimation information of the first channel, and after said first time period, receiving the uplink data frame sent over the first channel by the first station on the basis of the scheduling information; and sending a downlink data frame to a second station over a second channel, part or all of the time of the uplink data frame and the downlink data frame overlapping, but the carrier frequency of the first channel and the second channel being different. The out-of-band full duplex-based data transmission method, access point, and station set forth in the embodiments of the present invention can implement out-of-band full duplex communication of communication nodes and improve the frequency spectrum efficiency of a system.

Description

Method, access point and site for transmitting data based on out-of-band full duplex

Technical field

The present invention relates to the field of communications, and in particular, to a method, an access point, and a station for transmitting data based on out-of-band full duplex in the field of communications.

Background technique

Wireless Local Access Network (WLAN) standards based on Orthogonal Frequency Division Multiplexing ("OFDM") technology are gradually evolved from 802.11a, 802.11n, 802.11ac, etc. composition. The current WLAN system is also a half-duplex system at the wireless transmission level, that is, any communication node including an access point (Access Point, referred to as "AP") and a station (Station, referred to as "STA"). Only one transmitting or receiving operation can be performed at a time, and the transmitting and receiving operations cannot be performed at the same time.

Currently, the 802.11 standards organization of the Institute of Electrical and Electronics Engineers ("IEEE") has launched a new generation of WLAN called High Efficiency WLAN ("HEW"). Standardization work for the standard 802.11ax. Multi-user transmission techniques such as Multi-user Multiple-Input Multiple-Output ("MU-MIMO") technology and Orthogonal Frequency Division (Orthogonal Frequency Division) can be used in the standard. Multiple Access, referred to as "OFDMA" technology, etc., the multi-user transmission technology performs centralized scheduling and control through the AP, which can effectively reduce random competition and improve the spectrum efficiency of the WLAN system.

However, in the current multi-user transmission technologies such as MU-MIMO, OFDMA, etc., the AP and the multiple STAs can only transmit uplink data or downlink data in one direction at the same time, and cannot simultaneously transmit the uplink data and the downlink data in both directions. . In addition, the application research of full-duplex technology in WLAN currently only involves the transmission scheme of in-band full-duplex, and does not involve the transmission scheme based on out-band full duplex in WLAN. It is not related to a transmission scheme based on out-of-band full-duplex in a WLAN employing multi-user transmission technology.

Summary of the invention

In view of this, the embodiments of the present invention provide a method, an access point, and a station for transmitting data based on out-of-band full-duplex, which can implement out-of-band full-duplex communication of a communication node, thereby improving spectrum efficiency of the system. .

The first aspect provides an access point, including: a sending module, configured to send scheduling information to a first station on a first channel, where the scheduling information is used to schedule the first station to send an uplink data frame; And acquiring, by the receiving module, the self-interference channel estimation of the first channel acquired by the acquiring module, in a first time period after the transmitting module sends the scheduling information, Receiving, after the first time period, the uplink data frame that is sent by the first station according to the scheduling information on the first channel; the sending module is further configured to: send downlink data to the second station on the second channel a frame, wherein the uplink data frame received by the receiving module and the downlink data frame sent by the sending module overlap partially or completely in time, and the first channel is different from the carrier frequency of the second channel.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the sending module is configured to: send physical layer signaling to the first station on the first channel, where the physical layer signaling carries the Scheduling information; or transmitting a media access control MAC frame to the first station on the first channel, the MAC frame carrying the scheduling information.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in the second possible implementation manner of the first aspect, the scheduling information that is sent by the sending module includes at least one of the following information: each The uplink data transmission duration of the first station, the uplink data transmission duration of the first station with the largest uplink data transmission duration, the uplink data transmission duration upper limit, and the uplink data transmission duration lower limit.

With reference to the first aspect, the first or the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the sending module sends the scheduling information on the first channel The start time is the same as the start time of transmitting the downlink data frame on the second channel.

In conjunction with the first aspect or any one of the first to third possible implementations of the first aspect, in a fourth possible implementation of the first aspect, the transmitting module is further configured to: After receiving the uplink data frame, the receiving module sends an uplink response frame to the first station after the second time period; the receiving module is further configured to: after the sending module sends the downlink data frame, and after a third time The segment receives the downlink response frame sent by the second station, where the uplink response frame and the downlink response frame do not overlap each other in time.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation manner of the first aspect, the first site and the second site do not include the same site, and the first channel is When the start time of sending the scheduling information is the same as the starting time of transmitting the downlink data frame on the second channel, the time length T _UL of the uplink data frame and the time length T _{DL of} the downlink data frame satisfy the following relationship. One of (1) to (4):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ (1)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T _{ACK_DL} (2)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ (3)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T _{ACK_DL} (4)

Wherein, T ₁ , T _{2 ,} and T ₃ represent time lengths of the first time period, the second time period, and the third time period, respectively; Tt represents a length of time for transmitting the scheduling information; and T _{ACK_UL} represents the uplink response frame. The length of time; T _{ACK_DL} indicates the length of time of the downlink response frame; T _UL ^MAX indicates the upper limit of the uplink data transmission duration; T _UL ^MIN indicates the lower limit of the duration of the uplink data transmission.

In conjunction with the fourth possible implementation of the first aspect, in a sixth possible implementation manner of the first aspect, when the first site and the second site include the same site, the sending module is further configured to: At the time when the receiving module starts receiving the uplink data frame, suspending transmitting the downlink data frame to the second station on the second channel, and continuing to send to the second station on the second channel after the fourth time period And the downlink data frame, so that the second station acquires the self-interference channel estimation information of the second channel in the fourth time period.

With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the start time of the scheduling information is sent on the first channel, and the sending is performed on the second channel When the start time of the downlink data frame is the same, the time length T _UL of the uplink data frame and the time length T _{DL of} the downlink data frame satisfy one of the following relations (5) to (8):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (5)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (6)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (7)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (8)

Wherein, T ₁ , T ₂ , T _{3 ,} and T ₄ represent time lengths of the first time period, the second time period, the third time period, and the fourth time period, respectively; Tt represents a time when the scheduling information is sent. Length; T _{ACK_UL} indicates the length of time of the uplink response frame; T _{ACK_DL} indicates the length of time of the downlink response frame; T _UL ^MAX indicates the upper limit of the uplink data transmission duration; T _UL ^MIN indicates the lower limit of the uplink data transmission duration.

With reference to any one of the possible implementations of the fourth to the seventh possible implementations of the first aspect, in the eighth possible implementation manner of the first aspect, the first time period, the second time The length of the segment and the third time period are equal and are both short interframe spaces SIFS.

In a second aspect, a station is provided, including: a receiving module, configured to receive scheduling information sent by an access point AP on a first channel, where the scheduling information is used by a scheduling station to send an uplink data frame; and a sending module is configured to After receiving the scheduling information, the receiving module sends the uplink data frame to the AP on the first channel according to the scheduling information, and the receiving module is further configured to: receive the AP on the second channel. Sending the downlink data frame until the sending module starts to send the uplink data frame, where the uplink data frame sent by the sending module and the downlink data frame received by the receiving module partially or completely overlap in time, and the first channel Different from the carrier frequency of the second channel; the acquiring module is configured to acquire the self-interference channel estimation information of the second channel in a fourth time period in which the sending module starts to send the uplink data frame; the receiving module is further used to: After the fourth time period, the self-interference channel estimation information of the second channel acquired by the acquiring module continues to be connected to the second channel. The downlink data frame sent from the AP.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the receiving module is configured to: receive physical layer signaling sent by the AP on the first channel, where the physical layer signaling carries the scheduling And receiving the media access control MAC frame sent by the AP on the first channel, where the MAC frame carries the scheduling information.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in the second possible implementation manner of the second aspect, the scheduling information received by the receiving module includes at least one of the following information: each The uplink data transmission duration of the scheduled station, the uplink data transmission duration of the site with the largest uplink data transmission duration, the upper limit of the uplink data transmission duration, and the lower limit of the uplink data transmission duration.

With reference to the second aspect, the first or the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the receiving module receives the scheduling information on the first channel The start time is the same as the start time of receiving the downlink data frame on the second channel.

With reference to the second aspect or any one of the first to the third possible implementation manners of the second aspect, in a fourth possible implementation manner of the second aspect, the receiving module is further used to After receiving the uplink data frame, the sending module receives the uplink response frame sent by the AP, and the sending module is further configured to: after the receiving module receives the downlink data frame, and after a third time period Sending a downlink response frame to the AP, where the uplink response frame and the The downlink response frames do not overlap each other in time.

With reference to the fourth possible implementation of the second aspect, in a fifth possible implementation manner of the second aspect, the start time of receiving the scheduling information on the first channel is received on the second channel When the start time of the downlink data frame is the same, the time length T _UL of the uplink data frame and the time length T _{DL of} the downlink data frame satisfy one of the following relations (9) to (12):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (9)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (10)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (11)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (12)

In conjunction with the fourth or fifth possible implementation of the second aspect, in a sixth possible implementation manner of the second aspect, the first time period, the second time period, the third time period, and the The time lengths of the fourth time period are equal and are both short interframe spaces SIFS.

In a third aspect, a method for transmitting data based on out-of-band full-duplex is provided, the method comprising: sending scheduling information to a first station on a first channel, where the scheduling information is used to schedule the first station to send uplink data. Obtaining self-interference channel estimation information of the first channel in a first time period after the scheduling information is sent; receiving the first time after the first time period according to the self-interference channel estimation information of the first channel The uplink data frame sent by the station according to the scheduling information on the first channel; the downlink data frame is sent to the second station on the second channel, where the uplink data frame and the downlink data frame partially or completely overlap in time And the first channel is different from the carrier frequency of the second channel.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the sending the scheduling information to the first station on the first channel includes: sending a physical layer message to the first station on the first channel The physical layer signaling carries the scheduling information, or sends a media access control MAC frame to the first station on the first channel, where the MAC frame carries the scheduling information.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the scheduling information includes at least one of the following information: each of the first The uplink data transmission duration of the station, the uplink data transmission duration of the first station, the uplink data transmission duration upper limit, and the uplink data transmission duration lower limit of the uplink data transmission duration.

With reference to the third aspect, the first or the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the starting time of sending the scheduling information on the first channel is The start time of transmitting the downlink data frame on the second channel is the same.

With reference to the third aspect, or any one of the first to the third possible implementation manners of the third aspect, in a fourth possible implementation manner of the third aspect, the method further includes: After receiving the uplink data frame and after a second time period, sending an uplink response frame to the first station, and after receiving the downlink data frame, and receiving a downlink response frame sent by the second station, after receiving the downlink data frame, where The uplink response frame and the downlink response frame do not overlap each other in time.

With the fourth possible implementation of the third aspect, in a fifth possible implementation manner of the third aspect, the first site and the second site do not include the same site, and the first channel is configured When the start time of sending the scheduling information is the same as the starting time of transmitting the downlink data frame on the second channel, the time length T _UL of the uplink data frame and the time length T _{DL of} the downlink data frame satisfy the following relationship. One of (1) to (4):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ (1)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T _{ACK_DL} (2)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ (3)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T _{ACK_DL} (4)

With the fourth possible implementation of the third aspect, in a sixth possible implementation manner of the third aspect, when the first site and the second site include the same site, the second channel is Sending, by the second station, the downlink data frame, including: at the time of starting to receive the uplink data frame, suspending sending the downlink data frame to the second station on the second channel, and continuing to the second channel after the fourth time period The downlink data frame is sent to the second station, so that the second station acquires the self-interference channel estimation information of the second channel in the fourth time period.

With reference to the sixth possible implementation manner of the third aspect, in a seventh possible implementation manner of the third aspect, the start time of sending the scheduling information on the first channel is sent on the second channel When the start time of the downlink data frame is the same, the time length T _UL of the uplink data frame and the time length T _{DL of} the downlink data frame satisfy one of the following relations (5) to (8):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (5)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (6)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (7)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (8)

With reference to any one of the possible implementations of the fourth to the seventh possible implementations of the third aspect, in the eighth possible implementation manner of the third aspect, the first time period, the second time The length of the segment and the third time period are equal and are both short interframe spaces SIFS.

A fourth aspect provides a method for transmitting data based on out-of-band full-duplex, the method comprising: receiving, on a first channel, scheduling information sent by an access point AP, where the scheduling information is used by a scheduling station to send an uplink data frame. After receiving the scheduling information and after the first time period, sending the uplink data frame to the AP on the first channel according to the scheduling information; receiving the downlink data frame sent by the AP on the second channel until starting to send The uplink data frame, wherein the uplink data frame and the downlink data frame partially or completely overlap in time, and the first channel is different from the carrier frequency of the second channel; and the fourth time from the sending of the uplink data frame Obtaining the self-interference channel estimation information of the second channel, and after receiving the fourth time period, continuing to receive the downlink sent by the AP on the second channel according to the self-interference channel estimation information of the second channel Data Frame.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the receiving the scheduling information sent by the access point AP on the first channel, including: receiving, by using the first channel, a physical layer sent by the AP Signaling, the physical layer signaling carries the scheduling information; or receiving, on the first channel, a media access control MAC frame sent by the AP, where the MAC frame carries the scheduling information.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the scheduling information includes at least one of the following information: The uplink data transmission duration, the uplink data transmission duration of the uplink data transmission duration, the uplink data transmission duration upper limit, and the uplink data transmission duration lower limit.

With reference to the fourth aspect, the first or the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the starting time of receiving the scheduling information on the first channel is The start time of receiving the downlink data frame on the second channel is the same.

With reference to the fourth aspect, or any one of the first to the third possible implementation manners of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the method further includes: Receiving the uplink data frame and receiving the uplink response frame sent by the AP after the second time period; after receiving the downlink data frame, and after the third time period, sending a downlink response frame to the AP, where the uplink response frame is sent And the downlink response frames do not overlap each other in time.

With reference to the fourth possible implementation manner of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the start time of receiving the scheduling information on the first channel is received on the second channel When the start time of the downlink data frame is the same, the time length T _UL of the uplink data frame and the time length T _{DL of} the downlink data frame satisfy one of the following relations (9) to (12):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (9)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (10)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (11)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (12)

With reference to the fourth or fifth possible implementation manner of the fourth aspect, in a sixth possible implementation manner of the fourth aspect, the first time period, the second time period, the third time period, and the The time lengths of the fourth time period are equal and are both short interframe spaces SIFS.

Based on the foregoing technical solution, the method, the access point, and the station for transmitting data based on the out-of-band full-duplex according to the embodiment of the present invention send scheduling information to the station on the first channel through the access point, and acquire the self of the first channel. Interfering with channel estimation information, whereby the access point can receive, according to the self-interference channel estimation information, an uplink data frame sent by the station according to the scheduling information on the first channel; and at the same time, the access point is different from the first channel in the carrier frequency The downlink channel is sent to the station on the second channel, thereby enabling out-of-band full-duplex communication of the communication node and improving the spectrum efficiency of the system.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1(a) to 1(f) are schematic diagrams of application scenarios of an embodiment of the present invention.

2 is a schematic block diagram of an access point in accordance with an embodiment of the present invention.

3 is a schematic diagram of a single node out-of-band full duplex transmission in accordance with an embodiment of the present invention.

4 is another schematic diagram of a single node out-of-band full duplex transmission in accordance with an embodiment of the present invention.

5 is a schematic diagram of multi-node out-of-band full duplex transmission in accordance with an embodiment of the present invention.

6 is another schematic diagram of multi-node out-of-band full duplex transmission in accordance with an embodiment of the present invention.

Figure 7 is a schematic block diagram of a station in accordance with an embodiment of the present invention.

FIG. 8 is a schematic flowchart of a method for transmitting data based on out-of-band full duplex according to an embodiment of the present invention.

9 is another schematic flowchart of a method for transmitting data based on out-of-band full duplex according to an embodiment of the present invention.

FIG. 10 is a schematic flowchart of a method for transmitting data based on out-of-band full duplex according to another embodiment of the present invention.

11 is another schematic flowchart of a method for transmitting data based on out-of-band full duplex according to another embodiment of the present invention.

Figure 12 is a schematic block diagram of an access point in accordance with another embodiment of the present invention.

Figure 13 is a schematic block diagram of a station in accordance with another embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, for example, Global System of Mobile communication ("GSM") system, Code Division Multiple Access (Code Division Multiple Access, referred to as "CDMA" system, wideband code "Wideband Code Division Multiple Access" (WCDMA) system, General Packet Radio Service ("GPRS"), Long Term Evolution (LTE) system, LTE Frequency Division Duplex ("FDD") system, LTE Time Division Duplex ("TDD"), and Universal Mobile Telecommunication System (UMTS) Or Worldwide Interoperability for Microwave Access ("WiMAX") communication system.

It should be understood that the embodiment of the present invention is only described by taking a WLAN system as an example, but the present invention is not limited thereto, and the method and apparatus according to the embodiments of the present invention may also be applied to other communication systems; similarly, the embodiment of the present invention is also The AP and the STA in the WLAN system are taken as an example for description. However, the present invention is not limited thereto, and the method and apparatus according to the embodiments of the present invention can also be applied to base stations and user equipments in other communication systems.

For example, the base station may be a base station (Base Transceiver Station, abbreviated as "BTS") in GSM or CDMA, or may be a base station (NodeB, abbreviated as "NB") in WCDMA, or an evolved base station in LTE ( Evolved Node B, abbreviated as "ENB or e-NodeB", is not limited in the present invention.

For example, the user equipment (User Equipment, referred to as "UE") may be referred to as a terminal (Mobile), a mobile station (Mobile Station, or "Mobile"), or a mobile terminal (Mobile Terminal). Communicating with one or more core networks via a Radio Access Network ("RAN"), for example, the user equipment may be a mobile phone (or "cellular" phone) or a computer with a mobile terminal, etc. For example, the user equipment may also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges voice and/or data with the wireless access network.

1(a) to 1(f) are schematic views respectively showing an application scenario of an embodiment of the present invention. As shown in FIG. 1(a) and FIG. 1(b), only the AP supports full-duplex communication, that is, at least one STA receives a downlink signal from the AP, and at least one STA sends an uplink signal to the AP; and each STA still adopts The mode of half-duplex communication, that is, each STA only receives or transmits signals at any time. This full-duplex communication can also be called single-node full-duplex communication.

Full-duplex communication may also include multi-node full-duplex communication, that is, in addition to the way that the AP adopts full-duplex communication, at least one STA also adopts full-duplex communication, as shown in FIG. 1(c) to 1(f). Shown. Among them, STA3 in Figures 1(c) and 1(d) supports full-duplex communication, while STA1 and STA2 simultaneously transmits an uplink signal or simultaneously receives a downlink signal; STA3 in Figure 1(e) supports full-duplex communication, and STA1 and STA2 respectively receive downlink signals and transmit uplink signals; STA1 and STA3 in Figure 1(f) support Full duplex communication, while STA2 only supports half duplex communication.

It should be understood that the embodiment of the present invention is described by taking only the application scenario in FIG. 1(a) to FIG. 1(f) as an example, but the present invention is not limited thereto. For example, the system may further include more STAs and the like.

An access point 100 in accordance with an embodiment of the present invention will be described in detail below in conjunction with FIG. As shown in FIG. 2, the access point 100 includes: a sending module 110, an obtaining module 120, and a receiving module 130, where

The sending module 110 is configured to send scheduling information to the first station on the first channel, where the scheduling information is used to schedule the first station to send an uplink data frame;

The obtaining module 120 is configured to acquire self-interference channel estimation information of the first channel in a first time period after the sending module 110 sends the scheduling information;

The receiving module 130 is configured to receive, according to the self-interference channel estimation information of the first channel acquired by the acquiring module 120, the uplink sent by the first station according to the scheduling information on the first channel after the first time period. Data Frame;

The sending module 110 is further configured to: send a downlink data frame to the second station on the second channel, where the uplink data frame received by the receiving module 130 and the downlink data frame sent by the sending module 110 are partially in time or All overlap, and the first channel is different from the carrier frequency of the second channel.

Specifically, after the AP obtains the usage rights of the first channel and the second channel with different carrier frequencies, the sending module 110 of the AP may send scheduling information to the first station on the first channel, and may The second station sends a downlink data frame. The acquiring module 120 may obtain the self-interference channel estimation information of the first channel in the first time period after the sending module 110 sends the scheduling information, so that the receiving module 130 may be configured according to the self-interference channel. Estimating the information, receiving the uplink data frame sent by the first station according to the scheduling information on the first channel, where the uplink data frame received by the receiving module 130 and the downlink data frame sent by the sending module 110 are in time Part or all overlap.

Therefore, the access point based on the out-of-band full-duplex transmission data in the embodiment of the present invention sends scheduling information to the station on the first channel through the access point, and acquires self-interference channel estimation information of the first channel, thereby receiving The ingress point can receive, according to the self-interference channel estimation information, an uplink data frame sent by the station according to the scheduling information on the first channel; and at the same time, the access point sends the uplink frequency frame to the station on a second channel different from the first channel. The downlink data frame enables the out-of-band full-duplex communication of the communication node and improves the spectral efficiency of the system.

In the embodiment of the present invention, the first channel and the second channel are respectively radio channels occupying a certain bandwidth in the spectrum, and the carrier frequencies of the two channels are different, that is, there is no overlapping area in the passband of the first channel and the second channel. The first channel and the second channel may be adjacent or separated by a certain frequency band, and the bandwidths of the first channel and the second channel may be the same or different.

It should be understood that the radio channel included in the first channel or the second channel may be contiguous or non-contiguous in frequency spectrum. It should also be understood that in the embodiment of the present invention, the first channel and the second channel represent only two types. The channel, and the number, type, and the like of the channel are not limited. For example, the first channel may include various channels used by the station STA to send the uplink data frame to the access point AP, and the second channel may also include the AP sending the downlink to the STA. The various channels used by the data frame.

In the embodiment of the present invention, the first station may represent a station that sends an uplink data frame to the AP, and the second station may represent a station that receives the downlink data frame sent by the AP. Thus, when a station can support full-duplex communication, that is, when the station can receive data or signals and can transmit data or signals, the station can belong to the first station or to the second station.

It should also be understood that, in the embodiment of the present invention, the data transmission direction may include an uplink direction and a downlink direction, where the uplink direction may indicate a transmission direction of data from the STA to the AP, and the downlink direction may indicate transmission of data from the AP to the STA. Directions; correspondingly, data transmitted in the uplink direction may be referred to as uplink data, and frames carrying uplink data may also be referred to as uplink data frames; data transmitted in the downlink direction may be referred to as downlink data, and frames carrying downlink data may also be used. It is called a downlink data frame.

In the out-of-band full-duplex transmission scheme of the embodiment of the present invention, the AP may first obtain the usage rights of the first channel and the second channel through channel competition. For example, the AP may obtain the right to use the channel through the existing channel contending technology of the WLAN. The channel contending technology includes, for example, Request To Send (RTS)/Clear To Send (referred to as “Clear To Send”. The CTS") process, the CTS (tot-Self) process sent to itself, and the like.

Specifically, for example, in a multi-node out-of-band full-duplex system consisting of an AP and two STAs, the AP first simultaneously transmits an RTS frame on the first channel and the second channel, wherein the value of the duration field of the RTS frame The duration of the out-of-band full-duplex transmission after the CTS is greater than or equal to the end of the response frame, where the response frame may be an Acknowledgement (abbreviated as "ACK") or a Block Acknowledgement ("BA"). And the Transmit Address ("TA") field is set to the AP's own address.

Specifically, the receiving address of the RTS frame sent by the AP on the first channel (Receive Address, The field referred to as “RA” is set to the address of STA1 participating in the uplink data transmission in the multi-node out-of-band full-duplex transmission, and the receiving address RA field of the RTS frame transmitted in the second channel is set to participate in the multi-node out-of-band full double The address of STA2 that performs downlink data reception during transmission. When STA1 and STA2 receive the RTS frame, they respectively respond with a CTS frame, wherein the duration field is set to the out-of-band full-duplex transmission duration after the CTS to the end of the response frame.

Through the above RTS/CTS process, other nodes will set their own Network Allocation Vector ("NAV") according to the duration field in the RTS/CTS, whereby these other nodes are in the out-of-band full double No longer attempting to compete for the first channel and the second channel during transmission. After the AP receives the CTS and passes, for example, a Short Inter-Frame Space ("SIFS") time (typically 16us), the AP can perform out-of-band full-duplex transmission.

For another example, the AP may send a CTS-to-Self frame on the first channel and the second channel with a larger power, where the receiving address field of the frame is set to the AP's own address, and the value of the duration field is greater than or equal to The out-of-band full-duplex transmission duration after CTS-to-Self to the end of the response frame, and the response frame may be ACK or BA. Therefore, the STAs within the coverage of the AP can receive the CTS-to-Self frame without attempting to compete for the first channel and the second channel during the duration, thereby ensuring that the AP obtains during the duration. The right to use the channel. Thus, the AP can perform out-of-band full-duplex transmission after transmitting the CTS-to-Self frame and, for example, after the SIFS time.

It should be understood that the embodiment of the present invention only takes the example that the AP obtains the channel usage right through the RTS/CTS process and the CTS-to-Self process, but the present invention is not limited thereto, and the access point may also adopt other various methods. Get the right to use the channel.

It should be understood that, in the multi-user transmission, each STA does not directly contend for the channel, but after the channel obtains the channel usage right, the AP uses a certain scheduling algorithm to centrally schedule and control each STA for uplink or downlink transmission, and allows multiple STAs to pass. MU-MIMO and/or OFDMA are simultaneously transmitted in one direction, that is, the AP simultaneously transmits downlink signals to multiple STAs, or the AP simultaneously receives uplink signals from multiple STAs. The reason that the AP can implement centralized scheduling and control is that, on the one hand, the AP can have the information of the amount of downlink data to be received by the STAs in the downlink direction; on the other hand, the STA can be reported by the STA, or the AP can first query the STA and then report it. The AP can also obtain the information about the amount of uplink data to be sent by the STAs in the uplink direction. In addition, the AP can obtain the uplink channel and the downlink channel between the AP and each STA by means of self-measurement and STA measurement and reporting. Information such as channel state information, signal to interference and noise ratio (SINR), and the like. Thus, the AP can schedule based on the above information. One or more STAs, and may perform multi-user transmission in a suitable manner such as MU-MIMO, OFDMA, or the like.

Therefore, in the embodiment of the present invention, when performing multi-user transmission, the AP may also determine an STA (ie, the first station) for transmitting uplink data and participate in out-of-band full-duplex transmission, which participates in out-of-band full-duplex transmission. The STA (ie, the second station) for receiving the downlink data, and the AP may also acquire the data volume information to be sent and to be received, and the information related to the channel between the STAs in each of the STAs in the uplink and downlink directions, and the like. Used for outbound full duplex transmission scheduling.

An out-of-band full-duplex transmission scheme according to an embodiment of the present invention will be described in detail below with reference to FIGS. 3 through 6.

In the embodiment of the present invention, after the AP obtains the usage rights of the first channel and the second channel through channel competition and passes the initial time period, for example, as shown by T0 in FIG. 3 to FIG. 6, on the one hand, the AP The sending module 110 may send, on the first channel, a trigger frame carrying scheduling information for full-duplex transmission, to schedule at least one first STA to send an uplink data frame on the first channel; on the other hand, the sending of the AP The module 110 may send a downlink data frame to the at least one second STA on the second channel with different carrier frequencies.

It should be understood that when the number of the first STAs exceeds one, multiplexing may be performed by using a multi-user transmission manner such as uplink MU-MIMO and/or uplink OFDMA. When the AP sends downlink data frames to more than one downlink STA on the second channel, the AP may perform multiplexing by using a multi-user transmission mode such as downlink MU-MIMO and/or downlink OFDMA.

In the embodiment of the present invention, the AP may send the downlink data frame on the second channel while transmitting the trigger frame on the first channel; in addition, the AP may also send the trigger frame to send the downlink data frame first, or the AP may also send the downlink data frame first. The downlink data frame retransmits the trigger frame, which is not limited by the present invention.

Preferably, in the embodiment of the present invention, the sending moment of the sending module 110 transmitting the scheduling information on the first channel is the same as the starting time of sending the downlink data frame on the second channel. For example, as shown in FIG. 3 to FIG. 6 , after obtaining the usage right of the channel, the AP passes the T0 time, and sends the scheduling information on the first channel, and sends the downlink data frame on the second channel, where the T0 time is, for example. For short interframe space SIFS.

In the embodiment of the present invention, the sending module 110 is specifically configured to:

Transmitting physical layer signaling to the first station on the first channel, where the physical layer signaling carries the scheduling information; or

Transmitting media access control to the first site on the first channel (Media Access Control, referred to as "MAC" for short, the MAC frame carries the scheduling information.

Specifically, in the embodiment of the present invention, the triggering frame that carries the scheduling information sent by the AP to the first STA may send a scheduling indication to the first STA by using physical layer signaling, for example, may be in a preamble field of the trigger frame. The scheduling information is carried in the physical layer signaling field, and the scheduling information may be sent to the first STA by using a MAC frame. For example, the scheduling information may be carried in a data field of the trigger frame.

The physical layer signaling field may adopt a lower-order Modulation and Coding Scheme ("MCS"), for example, MCS0 in the WLAN, that is, Binary Phase Shift Keying (abbreviated as Binary Phase Shift Keying). "BPSK") modulation scheme, and convolutional coding with a code rate of 1/2. Therefore, even if the SINR of the channel is low, the first STA can correctly decode. Similarly, in order to ensure the reliability of the out-of-band full-duplex transmission scheduling information, when the scheduling information is sent by using a MAC control frame, the data field carrying the scheduling information in the trigger frame may also adopt a lower-order MCS such as MCS0. The transmission is performed, but the present invention is not limited to this.

In the embodiment of the present invention, the scheduling information is used to schedule the first station to send an uplink data frame, where the scheduling information may indicate the scheduled first station by using various manners, for example, the scheduling information may include each The identifier or the address information of the STA, or the scheduling information may include the group identifier or the group address information of the group to which the first STA belongs. The embodiment of the present invention is only described by way of example, but the present invention is not limited thereto.

Optionally, the scheduling information sent by the sending module 110 includes at least one of the following information: an uplink data transmission duration of each of the first stations, and an uplink data transmission of the first station with a maximum uplink data transmission duration. Duration, upstream data transmission duration upper limit and upstream data transmission duration lower limit.

Specifically, in the embodiment of the present invention, for the downlink direction, the AP acts as the sender, so the AP can always determine the length of the downlink data frame to be sent to the first STA. For the uplink direction, in one case, the AP can determine the modulation and coding scheme used by the first STA to transmit the uplink data frame and the amount of uplink transmission data, so the AP can completely determine the length of the uplink data frame to be sent by each first STA. . In this case, the scheduling information sent by the AP may include an uplink data transmission duration of each first STA, and/or an uplink data transmission duration of the STA with the largest uplink data transmission duration in the first STA.

For the uplink direction, another case is that the AP cannot accurately determine the modulation and coding scheme used by the first STA to transmit the uplink data frame and the amount of data transmitted in the uplink, and thus the AP cannot be completely The length of the uplink data frame to be transmitted by each first STA is determined. In this case, the scheduling information sent by the AP may include an upper limit of the uplink data transmission duration, that is, the length of the uplink data frame sent by all the first STAs cannot exceed the upper limit, or the scheduling information may include a lower limit of the uplink data transmission duration. That is, the length of the uplink data frame sent by all the first STAs cannot be lower than the lower limit. The data transmission duration is typically in units of milliseconds (ms), microseconds (us), or the like, or the data transmission duration may also be in units of OFDM symbol length.

It should be understood that, in the embodiment of the present invention, the content included in the scheduling information may not be limited thereto. For example, as described above, when the number of the first STAs exceeds one, uplink MU-MIMO and/or uplink OFDMA may be adopted. The user transmission mode is multiplexed. In this case, the scheduling information may further include resource allocation information, user scheduling information, and the like of the corresponding uplink MU-MIMO and/or uplink OFDMA.

The sending module 110 of the AP starts to receive the uplink data frame from the first STA on the first channel after the first time period T1 is sent, and the first time period T1 is, for example, SIFS, at this time, the sending module 110 of the AP still sends a downlink data frame to the second STA on the second channel, that is, the uplink data frame received by the receiving module 130 and the downlink data frame sent by the sending module 110 are in time. Part or all overlap, the AP enters the out-of-band full-duplex transmission phase, as shown in Figures 3-6.

When the AP enters the out-of-band full-duplex transmission phase, the AP transmitting the downlink data frame on the second channel may cause the AP to interfere with receiving the uplink data frame on the first channel. To this end, the acquiring module 120 of the AP may acquire the self-interference channel estimation information of the first channel in a first time period after the sending module 110 sends the scheduling information. In the first time period, since only the sending module 110 of the AP sends the downlink data frame on the second channel, and the first STA does not start to send the uplink data frame on the first channel, the acquiring module 120 of the AP can The self-interference channel estimation on the first channel is performed during the first time period, and the self-interference channel estimation is not interfered by the uplink data frame from the first STA.

In the embodiment of the present invention, the sending module 110 is further configured to: after the receiving module 130 receives the uplink data frame, and after a second time period, send an uplink response frame to the first station;

The receiving module 130 is further configured to: after the sending the downlink data frame, send the downlink response frame sent by the second station, where the uplink response frame and the downlink response frame are in time Do not overlap each other.

Specifically, in the embodiment of the present invention, in order to simplify system complexity and improve system performance, the uplink response frame and the downlink response frame may not overlap each other in time, so that the receiving module 130 of the AP receives the second channel. When the second STA is in the downlink response frame, the transmitting module 110 of the AP does not transmit a signal on the first channel, and does not interfere with the reception of the downlink response frame, and thus does not need to perform a self-interference cancellation operation on the second channel.

It should be understood that the uplink response frame or the downlink response frame is, for example, ACK or BA, etc., but the present invention is not limited thereto.

In the embodiment of the present invention, when the first site and the second site do not include the same site, that is, each site only receives or sends a signal at any time. In this case, in the full-duplex communication system, only the AP adopts full duplex. In the manner of communication, the STA adopts a half-duplex communication manner, and thus, the full-duplex communication system can also be referred to as a single-node full-duplex communication system. In the single-node full-duplex communication system, the AP only needs to perform self-interference channel estimation on the first channel in the first time period, thereby being able to accurately receive the uplink data frame sent by the first STA.

In the embodiment of the present invention, when the first site and the second site include the same site, the site receives both signals and signals at a certain moment, that is, the site and the AP adopt full duplex communication mode, and the whole The duplex communication system can also be referred to as a multi-node full-duplex communication system. Therefore, in the multi-node full-duplex communication system, in order to accurately receive signals, not only the AP needs to perform self-interference channel estimation on the first channel in the first time period, but also the STA needs to perform self-interference in the second channel. Offset operation.

Specifically, in the embodiment of the present invention, as shown in FIG. 5 and FIG. 6 , when the first site and the second site include the same site, the sending module 110 is further configured to:

At the time when the receiving module 130 starts receiving the uplink data frame, suspending transmitting the downlink data frame to the second station on the second channel, and continuing to the second station on the second channel after the fourth time period And sending the downlink data frame, so that the second station acquires the self-interference channel estimation information of the second channel in the fourth time period.

That is, in the embodiment of the present invention, when the first site and the second site include the same site, the AP The sending module 110 sends a downlink data frame to the second station on the second channel until the receiving module 130 of the AP starts receiving the uplink data frame on the first channel; starting from receiving the uplink data frame from the receiving module 130 During the fourth time period, the second STA may estimate the self-interference channel of the second channel, so that the second STA can accurately receive the downlink data frame sent by the AP; after the fourth time period, the sending module 110 of the AP The downlink data frame is continuously sent to the second station on the second channel.

It should be understood that, in the embodiment of the present invention, only the time when the AP starts to receive the uplink data frame is taken as an example of the start time of the AP to suspend the transmission of the downlink data frame, but the present invention is not limited thereto. For example, the AP may also be advanced. Suspending the transmission of the downlink data frame, for example, the AP starts to suspend the transmission of the downlink data frame in the first time period; accordingly, the STA only needs to perform self-interference channel estimation when transmitting the uplink data frame, and then the STA may according to the self-interference channel. The estimated information is received for the downlink data frame.

In the following, in detail, in the case of single-node and multi-node out-of-band full-duplex transmission, how to make the uplink response frame and the downlink response frame do not overlap each other in time in conjunction with FIG. 3-4 and FIG. 5-6, respectively. To simplify system complexity and improve system performance.

Specifically, in a single-node out-of-band full-duplex transmission system, that is, when the first station and the second station do not include the same site, the AP may perform scheduling to enable uplink and downlink transmission of out-of-band full-duplex transmission. The absolute value of the time difference at the end time is greater than the length of time of a response frame (ACK or BA, etc.), so that the uplink and downlink response frames do not overlap each other in time, so that when the AP receives the downlink response frame from the second STA, the AP is The uplink acknowledgement frame is not transmitted on the first channel, so the AP does not need to perform self-interference cancellation operation on the second channel, thereby simplifying system complexity and improving system performance.

3 and 4 illustrate two specific embodiments of a single node out-of-band full duplex transmission method, respectively, in accordance with an embodiment of the present invention. As shown in FIG. 3 and FIG. 4, the AP may first obtain the usage right of the first channel with the carrier frequency F1 and the second channel with the carrier frequency F2 through channel competition; after the initial time period, the AP starts to be at the carrier frequency F2. The second channel sends a downlink data frame to the second STA. At the same time, the AP starts to send a trigger frame on the first channel with the carrier frequency F1, and is used to schedule the first STA to send the uplink data frame; the second after the trigger frame ends. During the time period, the AP acquires the self-interference channel estimation information of the first channel for subsequent self-interference cancellation operation on the first channel, so that the uplink data frame from the first STA can be accurately received.

For the AP, the length of the uplink data frame to be sent by each first STA may be completely determined, as long as the time length T _UL of the uplink data frame and the time length T _{DL of} the downlink data frame can satisfy the following relationship (1) or (2), it can be ensured that the uplink and downlink acknowledgment frames do not overlap each other in time, so that when the AP receives the response frame from the second STA, the AP does not transmit a signal on the first channel, and thus does not need to perform self-interference on the second channel. Offset operation.

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ (1)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T _{ACK_DL} (2)

When the time lengths of the first time period, the second time period, and the third time period are equal and both are short inter-frame intervals SIFS, the above relations (1) and (2) are respectively a relationship (1' ) and (2'):

Tt+SIFS+T _{ACK_UL} <T _DL -T _UL (1')

Tt+T _UL +SIFS>T _DL +T _{ACK_DL} (2')

Wherein, T ₁ , T _{2 ,} and T ₃ represent time lengths of the first time period, the second time period, and the third time period, respectively; Tt represents a length of time for transmitting the scheduling information; and T _{ACK_UL} represents the uplink response frame. The length of time; T _{ACK_DL} indicates the length of time of the downlink response frame.

For the case where the AP cannot completely determine the length of the uplink data frame to be sent by each first STA, as described above, the AP may include an uplink data transmission duration upper limit or an uplink data transmission duration lower limit in the scheduling information, that is, all the first The length of the uplink data frame sent by a STA cannot exceed the upper limit of the uplink data transmission duration, or the length of the uplink data frame sent by all the first STAs cannot be lower than the lower limit of the uplink data transmission duration. Therefore, the AP can be scheduled, and the uplink and downlink response frames can be guaranteed as long as the time length T _UL of the uplink data frame and the time length T _{DL of} the downlink data frame can satisfy the following relationship (3) or (4). When they do not overlap each other in time, when the AP receives the response frame from the second STA, the AP does not transmit a signal on the first channel, and thus does not need to perform a self-interference cancellation operation on the second channel.

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ (3)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T _{ACK_DL} (4)

When the time lengths of the first time period, the second time period, and the third time period are equal and both are short inter-frame intervals SIFS, the above relations (3) and (4) are respectively a relationship (3' ) and (4'):

Tt+T _UL ^MAX +SIFS+T _{ACK_UL} <T _DL (3')

Tt+T _UL ^MIN +SIFS>T _DL +T _{ACK_DL} (4')

Wherein T ₁ , T _{2 ,} and T ₃ represent time lengths of the first time period, the second time period, and the third time period, respectively; Tt represents a length of time during which the scheduling information is sent; and T _{ACK_UL} represents the uplink response frame. The length of time; T _{ACK_DL} indicates the length of time of the downlink response frame; T _UL ^MAX indicates the upper limit of the uplink data transmission duration, that is, T _UL ≤ T _UL ^MAX ; T _UL ^MIN indicates the lower limit of the uplink data transmission duration, that is, T _UL ≥ T _UL ^MIN .

In the multi-node out-of-band full-duplex transmission system, that is, when the first station and the second station include the same site, as shown in FIG. 5 and FIG. 6, the AP passes the first end of the first channel transmission trigger frame. After the time period, that is, when the AP starts to receive the uplink data frame on the first channel, the AP pauses to send the downlink data frame on the second channel, and then resumes transmitting the downlink data frame on the second channel after the fourth time period; The first STA starts to send an uplink data frame to the AP after the first time period of the first channel reception trigger frame ends; at the same time, the second STA pauses to receive the downlink data frame on the second channel, and at the fourth time The self-interference channel estimation information on the second channel is obtained. After the fourth time period, the second STA starts to receive the downlink data frame from the AP on the second channel.

Similarly, as long as the time length T _UL of the uplink data frame and the time length T _{DL of} the downlink data frame can satisfy any one of the following relational expressions (5) to (8), the uplink and downlink response frames can be guaranteed. The time does not overlap each other, so that when the AP receives the response frame from the second STA, the AP does not transmit a signal on the first channel, and thus does not need to perform a self-interference cancellation operation on the second channel.

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (5)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (6)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (7)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (8)

When the time lengths of the first time period, the second time period, the third time period, and the fourth time period are equal and both are short inter-frame intervals SIFS, the above relations (5) to (8) are respectively specific For the relationship (5') to (8'):

Tt+T _UL +T _{ACK_UL} <T _DL (5')

Tt+T _UL >T _DL +T _{ACK_DL} (6')

Tt+T _UL ^MAX +T _{ACK_UL} <T _DL (7')

Tt+T _UL ^MIN >T _DL +T _{ACK_DL} (8')

Wherein, T ₁ , T ₂ , T _{3 ,} and T ₄ represent time lengths of the first time period, the second time period, the third time period, and the fourth time period, respectively; Tt represents a time when the scheduling information is sent. Length; T _{ACK_UL} indicates the length of time of the uplink response frame; T _{ACK_DL} indicates the length of time of the downlink response frame; T _UL ^MAX indicates the upper limit of the uplink data transmission duration; and T _UL ^MIN indicates the lower limit of the uplink data transmission duration.

It should be understood that the embodiment of the present invention is only described by taking the embodiment shown in FIG. 3 to FIG. 6 as an example, but the present invention is not limited thereto. According to the embodiment of the present invention, other schemes may be adopted to make the uplink response frame and the The downlink response frames do not overlap each other in time.

It should also be understood that the start time of transmitting the scheduling information on the first channel is the same as the starting time of transmitting the downlink data frame on the second channel in FIG. 3 to FIG. 6, but the present invention is not limited to For example, the start time of sending the scheduling information may be different from the starting time of sending the downlink data frame, and the relationship (1) to (8) may be adaptively changed to make the uplink response frame. And the downlink response frames do not overlap each other in time.

It should be understood that the embodiment of the present invention is only described by taking the same time lengths of the first time period, the second time period, the third time period, and the fourth time period as an example, but the present invention is not limited thereto, and the first time period The lengths of the second time period, the third time period, and the fourth time period may also be set to be unequal as needed.

An access point based on out-of-band full-duplex transmission data according to an embodiment of the present invention is described in detail above with reference to FIG. 1 to FIG. 6, and an out-of-band full double according to an embodiment of the present invention will be described in detail below with reference to FIG. 7. The site where the data is transmitted.

As shown in FIG. 7, a site 200 according to an embodiment of the present invention includes:

The receiving module 210 is configured to receive scheduling information sent by the access point AP on the first channel, where the scheduling information is used by the scheduling station to send an uplink data frame.

The sending module 220 is configured to send the uplink data frame to the AP on the first channel according to the scheduling information after the receiving module 210 receives the scheduling information and passes the first time period;

The receiving module 210 is further configured to: receive the downlink data frame sent by the AP on the second channel, until the sending module 220 starts to send the uplink data frame, where the uplink data frame sent by the sending module 220 and the receiving module 210 Receiving the downlink data frame partially or completely overlapping in time, and the first channel is different from the carrier frequency of the second channel;

The obtaining module 230 is configured to acquire self-interference channel estimation information of the second channel in a fourth time period in which the sending module 220 starts to send the uplink data frame;

The receiving module 210 is further configured to: after receiving the fourth time period, continue to receive the downlink data sent by the AP on the second channel according to the self-interference channel estimation information of the second channel acquired by the acquiring module 230. frame.

Specifically, after the AP obtains the usage rights of the first channel and the second channel with different carrier frequencies, the receiving module 210 of the station 200 may receive the scheduling information sent by the AP on the first channel; and the receiving module 210 may be The downlink data frame sent by the AP is received on the second channel different from the first channel; the sending module 220 of the station 200 may receive the scheduling information after the receiving module 210 passes the first time period, according to the scheduling The information is sent to the AP on the first channel, and the receiving module 210 may pause receiving the downlink data frame in the fourth time period in which the sending module 220 starts to send the uplink data frame, and the station 200 The obtaining module 230 may obtain the self-interference channel estimation information of the second channel. After the fourth time period, the receiving module 210 may continue to receive on the second channel according to the self-interference channel estimation information of the second channel. The downlink data frame sent by the AP.

Therefore, the station based on the out-of-band full-duplex transmission data in the embodiment of the present invention receives the scheduling information sent by the access point through the station, and sends an uplink data frame to the access point on the first channel according to the scheduling information; The station receives the downlink data frame sent by the access point on the second channel whose carrier frequency is different from the first channel, until the station starts to send the uplink data frame, and acquires the self-interference channel estimation information of the second channel, so that the station can According to the self-interference channel estimation information, the downlink data frame transmitted by the access point is continuously received on the second channel, thereby enabling out-of-band full-duplex communication of the communication node, and the spectrum efficiency of the system can be improved.

In the embodiment of the present invention, the receiving module 210 is specifically configured to:

Receiving, by using the first channel, physical layer signaling sent by the AP, where the physical layer signaling carries the scheduling information; or

Receiving, on the first channel, a media access control MAC frame sent by the AP, where the MAC frame carries the scheduling information.

In the embodiment of the present invention, optionally, the scheduling information received by the receiving module 210 includes at least one of the following information: an uplink data transmission duration of each scheduled station, and a site with a longest uplink data transmission duration. The uplink data transmission duration, the uplink data transmission duration upper limit, and the uplink data transmission duration lower limit.

In the embodiment of the present invention, optionally, the start time of the receiving module 210 receiving the scheduling information on the first channel is the same as the starting time of receiving the downlink data frame on the second channel.

In the embodiment of the present invention, the receiving module 210 is further configured to: after the sending module 220 sends the uplink data frame, and after a second time period, receive an uplink response frame sent by the AP;

The sending module 220 is further configured to send a downlink response frame to the AP after the receiving module 210 receives the downlink data frame and after a third time period, where the uplink response frame and the downlink response frame are not in time overlapping.

In the embodiment of the present invention, optionally, when the starting time of receiving the scheduling information on the first channel is the same as the starting time of receiving the downlink data frame on the second channel, the time of the uplink data frame The length T _UL and the time length T _{DL of} the downlink data frame satisfy one of the following relations (9) to (12):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (9)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (10)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (11)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (12)

In the embodiment of the present invention, optionally, the time lengths of the first time period, the second time period, the third time period, and the fourth time period are equal and are all short inter-frame intervals SIFS.

It should be understood that the interaction between the site and the access point AP and the related features and functions of the site described on the STA side of the site correspond to the description on the AP side of the access point. For brevity, details are not described herein again.

Therefore, the station based on the out-of-band full-duplex transmission data in the embodiment of the present invention receives the scheduling information sent by the access point through the station, and sends an uplink data frame to the access point on the first channel according to the scheduling information; The station receives the downlink data frame sent by the access point on the second channel whose carrier frequency is different from the first channel, until the station starts to send the uplink data frame, and acquires the self-interference channel estimation information of the second channel, so that the station can According to the self-interference channel estimation information, the downlink data frame sent by the access point is continuously received on the second channel, thereby enabling out-of-band full-duplex communication of the communication node, improving the spectrum efficiency of the system, and simplifying the system. Complexity to improve system performance.

The apparatus for transmitting data based on out-of-band full-duplex according to an embodiment of the present invention is described in detail above with reference to FIG. 1 to FIG. 7, and the following is based on the out-of-band full according to an embodiment of the present invention with reference to FIG. 8 to FIG. Duplex method of transferring data.

8 shows a schematic flow diagram of an out-of-band full-duplex based transmission data method 400, such as performed by an access point AP, in accordance with an embodiment of the present invention. As shown in FIG. 8, the method 400 includes:

S410. Send scheduling information to the first station on the first channel, where the scheduling information is used to schedule the first station to send an uplink data frame.

S420. Acquire self-interference channel estimation information of the first channel in a first time period after the scheduling information is sent.

S430, receiving, according to the self-interference channel estimation information of the first channel, the uplink data frame that is sent by the first station according to the scheduling information on the first channel after the first time period;

S440. Send a downlink data frame to the second station on the second channel, where the uplink data frame and the downlink data frame partially or completely overlap in time, and the first channel is different from the carrier frequency of the second channel.

Therefore, the method for transmitting data based on out-of-band full-duplex according to the embodiment of the present invention sends scheduling information to a station on a first channel through an access point, and acquires self-interference channel estimation information of the first channel, thereby accessing The point can receive, according to the self-interference channel estimation information, an uplink data frame sent by the station according to the scheduling information on the first channel; and at the same time, the access point sends the downlink to the station on a second channel with a different carrier frequency than the first channel. The data frame enables the out-of-band full-duplex communication of the communication node and improves the spectral efficiency of the system.

It should be understood that the embodiment of the present invention is described by taking the method 400 performed by the AP as an example. However, the present invention is not limited thereto, and other network devices may also perform the method, for example, the base station, the network control device, and the like may perform the method.

In an embodiment of the invention, optionally, sending the scheduling information to the first station on the first channel includes:

And transmitting, on the first channel, a media access control MAC frame to the first station, where the MAC frame carries the scheduling information.

In an embodiment of the invention, optionally, the scheduling information includes at least one of the following information: each The uplink data transmission duration of the first station, the uplink data transmission duration of the first station with the largest uplink data transmission duration, the uplink data transmission duration upper limit, and the uplink data transmission duration lower limit.

In an embodiment of the invention, optionally, the starting time of transmitting the scheduling information on the first channel is the same as the starting time of sending the downlink data frame on the second channel.

In an embodiment of the invention, optionally, as shown in FIG. 9, the method 400 further includes:

S450. After receiving the uplink data frame, and after a second time period, send an uplink response frame to the first station.

S460. After transmitting the downlink data frame, and after a third time period, receive a downlink response frame sent by the second station, where the uplink response frame and the downlink response frame do not overlap each other in time.

In an embodiment of the present invention, optionally, the first station and the second station do not include the same site, and the start time of sending the scheduling information on the first channel is sent on the second channel. When the start time of the downlink data frame is the same, the time length T _UL of the uplink data frame and the time length T _{DL of} the downlink data frame satisfy one of the following relational expressions (1) to (4):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ (1)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T _{ACK_DL} (2)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ (3)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T _{ACK_DL} (4)

In an embodiment of the invention, optionally, when the first site and the second site include the same site, the downlink data frame is sent to the second site on the second channel, including:

At the time of starting to receive the uplink data frame, suspending transmitting the downlink data frame to the second station on the second channel, and continuing to send the downlink data to the second station on the second channel after the fourth time period a frame, so that the second station acquires self-interference channel estimation information of the second channel in the fourth time period.

In an embodiment of the invention, optionally, the time length of the uplink data frame when the starting time of sending the scheduling information on the first channel is the same as the starting time of sending the downlink data frame on the second channel The time length T _{DL of the} T _UL and the downlink data frame satisfies one of the following relations (5) to (8):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (5)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (6)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (7)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (8)

In an embodiment of the invention, optionally, the time lengths of the first time period, the second time period and the third time period are equal and both are short inter-frame intervals SIFS.

It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention. The implementation process constitutes any limitation.

It should also be understood that the various steps or flows in the method 400 in accordance with embodiments of the present invention may correspond to the above and other operations and/or functions of the various modules of the access point 100 in the embodiments of the present invention, for the sake of brevity. No longer.

Therefore, the method for transmitting data based on out-of-band full-duplex according to the embodiment of the present invention sends scheduling information to a station on a first channel through an access point, and acquires self-interference channel estimation information of the first channel, thereby accessing The point can receive, according to the self-interference channel estimation information, an uplink data frame sent by the station according to the scheduling information on the first channel; and at the same time, the access point sends the downlink to the station on a second channel with a different carrier frequency than the first channel. The data frame can thereby realize the out-of-band full-duplex communication of the communication node, improve the spectrum efficiency of the system, and can simplify the complexity of the system and improve the performance of the system.

With reference to FIG. 8 and FIG. 9 above, a method for transmitting data based on out-of-band full-duplex according to an embodiment of the present invention is described in detail from the perspective of an access point, which will be described from the perspective of a station in conjunction with FIG. 10 and FIG. A method for transmitting data based on out-of-band full duplex according to an embodiment of the present invention.

FIG. 10 illustrates an out-of-band full-duplex based transmission data method 500, which may be performed, for example, by a station STA, in accordance with another embodiment of the present invention. As shown in FIG. 10, the method 500 includes:

S510. Receive scheduling information sent by an access point AP on a first channel, where the scheduling information is used. The scheduling station sends an uplink data frame;

S520. After receiving the scheduling information and after the first time period, send the uplink data frame to the AP on the first channel according to the scheduling information.

S530, receiving a downlink data frame sent by the AP on the second channel, and starting to send the uplink data frame, where the uplink data frame and the downlink data frame partially or completely overlap in time, and the first channel and the first channel The carrier frequencies of the two channels are different;

S540: Acquire self-interference channel estimation information of the second channel in a fourth time period from the start of sending the uplink data frame.

S550. After the fourth time period, according to the self-interference channel estimation information of the second channel, continue to receive the downlink data frame sent by the AP on the second channel.

Therefore, the method for transmitting data based on the out-of-band full-duplex according to the embodiment of the present invention receives the scheduling information sent by the access point through the station, and sends the uplink data frame to the access point on the first channel according to the scheduling information; Receiving, by the station, the downlink data frame sent by the access point on the second channel different from the first channel, until the station starts to send the uplink data frame, and acquiring the self-interference channel estimation information of the second channel, where the station According to the self-interference channel estimation information, the downlink data frame transmitted by the access point can be continuously received on the second channel, thereby enabling out-of-band full-duplex communication of the communication node, and the spectrum efficiency of the system can be improved.

In the embodiment of the present invention, optionally, receiving the scheduling information sent by the access point AP on the first channel, including:

In an embodiment of the invention, optionally, the scheduling information includes at least one of the following information: an uplink data transmission duration of each scheduled station, an uplink data transmission duration of a station with the largest uplink data transmission duration, The upper limit of the uplink data transmission duration and the lower limit of the uplink data transmission duration.

In an embodiment of the invention, optionally, the starting time of receiving the scheduling information on the first channel is the same as the starting time of receiving the downlink data frame on the second channel.

In an embodiment of the invention, optionally, as shown in FIG. 11, the method 500 further includes:

S560, after sending the uplink data frame and after a second period of time, receiving the sending by the AP Uplink response frame;

S570. After receiving the downlink data frame, and after a third time period, send a downlink response frame to the AP, where the uplink response frame and the downlink response frame do not overlap each other in time.

In an embodiment of the invention, optionally, the time length of the uplink data frame when the start time of receiving the scheduling information on the first channel is the same as the start time of receiving the downlink data frame on the second channel The time length T _{DL of the} T _UL and the downlink data frame satisfies one of the following relations (9) to (12):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (9)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (10)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (11)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (12)

In an embodiment of the invention, optionally, the time lengths of the first time period, the second time period, the third time period, and the fourth time period are equal and are all short inter-frame intervals SIFS.

It should also be understood that the various steps or processes in the method 500 in accordance with embodiments of the present invention may correspond to the above and other operations and/or functions of the various modules of the station 200 in the embodiments of the present invention, for the sake of brevity, no longer Narration.

Therefore, the method for transmitting data based on the out-of-band full-duplex according to the embodiment of the present invention receives the scheduling information sent by the access point through the station, and sends the uplink data frame to the access point on the first channel according to the scheduling information; Receiving, by the station, the downlink data frame sent by the access point on the second channel different from the first channel, until the station starts to send the uplink data frame, and acquiring the self-interference channel estimation information of the second channel, where the station According to the self-interference channel estimation information, the downlink data frame sent by the access point can be continuously received on the second channel, thereby enabling out-of-band full-duplex communication of the communication node, improving the spectrum efficiency of the system, and simplifying the system. The complexity of the system improves the performance.

It should be understood that the terms "system" and "network" are used interchangeably herein. The term "and/or" in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

It should also be understood that in the embodiment of the present invention, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.

As shown in FIG. 12, an embodiment of the present invention further provides an access point 700 based on out-of-band full-duplex transmission data, where the access point 700 includes a processor 710, a memory 720, a bus system 730, a receiver 740, and Transmitter 750. The processor 710, the memory 720, the receiver 740 and the transmitter 750 are connected by a bus system 730 for storing instructions for executing instructions stored in the memory 720 to control the receiver 740 to receive. Signaling and controlling the transmitter 750 to send a signal;

The transmitter 750 is configured to send scheduling information to the first station on the first channel, where the scheduling information is used to schedule the first station to send an uplink data frame.

The processor 710 is configured to acquire self-interference channel estimation information of the first channel in a first time period after the transmitter 750 sends the scheduling information.

The receiver 740 is configured to receive, according to the self-interference channel estimation information of the first channel acquired by the processor 710, the uplink sent by the first station according to the scheduling information on the first channel after the first time period. Data Frame;

The transmitter 750 is further configured to: send a downlink data frame to the second station on the second channel, where the uplink data frame received by the receiver 740 and the downlink data frame sent by the transmitter 750 are partially in time or All overlap, and the first channel is different from the carrier frequency of the second channel.

Therefore, the access point in the embodiment of the present invention sends scheduling information to the station on the first channel through the access point, and acquires self-interference channel estimation information of the first channel, so that the access point can estimate according to the self-interference channel. Information, on the first channel, receiving an uplink data frame sent by the station according to the scheduling information; at the same time, the access point sends a downlink data frame to the station on a second channel different from the first channel, thereby enabling communication Out-of-band full-duplex communication of nodes and improved spectral efficiency of the system.

It should be understood that in the embodiment of the present invention, the processor 710 may be a central processing unit (Central) Processing Unit (referred to as "CPU"). The processor 710 can also be other general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs), or other programmable logic. Devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 720 can include read only memory and random access memory and provides instructions and data to the processor 710. A portion of the memory 720 can also include a non-volatile random access memory. For example, the memory 720 can also store information of the device type.

The bus system 730 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 730 in the figure.

In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 710 or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in memory 720, and processor 710 reads the information in memory 720 and, in conjunction with its hardware, performs the steps of the above method. To avoid repetition, it will not be described in detail here.

Optionally, as an embodiment, the transmitter 750 is specifically configured to:

Optionally, as an embodiment, the scheduling information sent by the transmitter 750 includes at least one of the following information: an uplink data transmission duration of each of the first stations, and the first uplink data transmission duration is the largest. The uplink data transmission duration of the station, the upper limit of the uplink data transmission duration, and the lower limit of the uplink data transmission duration.

Optionally, as an embodiment, the start time of the transmitter 750 transmitting the scheduling information on the first channel is the same as the starting time of sending the downlink data frame on the second channel.

Optionally, as an embodiment, the transmitter 750 is further configured to: after the receiver 740 receives the uplink data frame, and after a second time period, send an uplink response frame to the first station;

The receiver 740 is further configured to: after the transmitter 750 sends the downlink data frame and after the And receiving, by the second station, a downlink response frame sent by the second station, where the uplink response frame and the downlink response frame do not overlap each other in time.

Optionally, as an embodiment, the first station and the second station do not include the same site, and the start time of sending the scheduling information on the first channel is sent and the downlink is sent on the second channel. When the start time of the data frame is the same, the time length T _UL of the uplink data frame and the time length T _{DL of} the downlink data frame satisfy one of the following relational expressions (1) to (4):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ (1)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T _{ACK_DL} (2)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ (3)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T _{ACK_DL} (4)

Optionally, as an embodiment, when the first site and the second site include the same site, the transmitter 750 is further configured to:

At the time when the receiver 740 starts receiving the uplink data frame, suspending transmitting the downlink data frame to the second station on the second channel, and continuing to the second station on the second channel after the fourth time period And sending the downlink data frame, so that the second station acquires the self-interference channel estimation information of the second channel in the fourth time period.

Optionally, as an embodiment, when the starting time of sending the scheduling information on the first channel is the same as the starting time of sending the downlink data frame on the second channel, the length of time T of the uplink data frame The time length T _{DL of the} _UL and the downlink data frame satisfies one of the following relations (5) to (8):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (5)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (6)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (7)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (8)

Wherein, T ₁ , T ₂ , T _{3 ,} and T ₄ represent time lengths of the first time period, the second time period, the third time period, and the fourth time period, respectively; Tt represents a time when the scheduling information is sent. Length; T _{ACK_UL} indicates the length of time of the uplink response frame; T _{ACK_DL} indicates the time length of the downlink response frame; T _UL ^MAX indicates the upper limit of the uplink data transmission duration; T _UL ^MIN indicates the lower limit of the uplink data transmission duration.

Optionally, as an embodiment, the time lengths of the first time period, the second time period, and the third time period are equal and are all short inter-frame intervals SIFS.

It should be understood that the access point 700 in accordance with an embodiment of the present invention may correspond to the access point 100 in an embodiment of the present invention, and that the above and other operations and/or functions of the various modules in the access point 700 are respectively implemented to implement FIG. The corresponding flow of the method 400 in FIG. 9 is omitted here for brevity.

Therefore, the access point in the embodiment of the present invention sends scheduling information to the station on the first channel through the access point, and acquires self-interference channel estimation information of the first channel, so that the access point can estimate according to the self-interference channel. Information, on the first channel, receiving an uplink data frame sent by the station according to the scheduling information; at the same time, the access point sends a downlink data frame to the station on a second channel different from the first channel, thereby enabling communication Out-of-band full-duplex communication of nodes improves the spectrum efficiency of the system and simplifies system complexity and improves system performance.

As shown in FIG. 13, an embodiment of the present invention further provides a station 800 for transmitting data based on out-of-band full duplex, the station 800 including a processor 810, a memory 820, a bus system 830, a receiver 840, and a transmitter 850. . The processor 810, the memory 820, the receiver 840, and the transmitter 850 are connected by a bus system 830 for storing instructions for executing instructions stored in the memory 820 to control the receiver 840 to receive. Signaling, and controlling the transmitter 850 to send a signal;

The receiver 840 is configured to receive scheduling information sent by the access point AP on the first channel, where the scheduling information is used by the scheduling station to send an uplink data frame.

The transmitter 850 is configured to send the uplink data frame to the AP on the first channel according to the scheduling information after the receiver 840 receives the scheduling information and after a first time period;

The receiver 840 is further configured to: receive the downlink data frame sent by the AP on the second channel until the transmitter 850 starts to send the uplink data frame, where the uplink data frame sent by the transmitter 850 and the receiver 840 Receiving the downlink data frame partially or completely overlapping in time, and the first channel is different from the carrier frequency of the second channel;

The processor 810 is configured to acquire self-interference channel estimation information of the second channel in a fourth time period in which the transmitter 850 starts transmitting the uplink data frame.

The receiver 840 is further configured to: after receiving the fourth time period, continue to receive the AP transmission on the second channel according to the self-interference channel estimation information of the second channel acquired by the processor 810. The downlink data frame sent.

Therefore, the station in the embodiment of the present invention receives the scheduling information sent by the access point through the station, and sends an uplink data frame to the access point on the first channel according to the scheduling information. Meanwhile, the carrier is different from the first channel in the carrier frequency. Receiving a downlink data frame sent by the access point until the station starts transmitting the uplink data frame, and acquiring self-interference channel estimation information of the second channel, so that the station can estimate the information according to the self-interference channel The downlink channel continues to receive the downlink data frame sent by the access point, thereby enabling out-of-band full-duplex communication of the communication node and improving the spectrum efficiency of the system.

It should be understood that, in the embodiment of the present invention, the processor 810 may be a central processing unit ("CPU"), and the processor 810 may also be other general-purpose processors, digital signal processors (DSPs). , an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 820 can include read only memory and random access memory and provides instructions and data to the processor 810. A portion of the memory 820 may also include a non-volatile random access memory. For example, the memory 820 can also store information of the device type.

The bus system 830 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 830 in the figure.

In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 810 or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 820, and the processor 810 reads the information in the memory 820 and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

Optionally, as an embodiment, the receiver 840 is specifically configured to:

Optionally, as an embodiment, the scheduling information received by the receiver 840 includes at least one of the following information: an uplink data transmission duration of each scheduled station, and an uplink of a station with the largest uplink data transmission duration. The data transmission duration, the upper limit of the uplink data transmission duration, and the lower limit of the uplink data transmission duration.

Optionally, as an embodiment, the start time of the receiver 840 receiving the scheduling information on the first channel is the same as the starting time of receiving the downlink data frame on the second channel.

Optionally, as an embodiment, the receiver 840 is further configured to: after the transmitter 850 sends the uplink data frame, and after a second time period, receive an uplink response frame sent by the AP;

The transmitter 850 is further configured to: after the receiver 840 receives the downlink data frame, and after a third time period, send a downlink response frame to the AP, where the uplink response frame and the downlink response frame are not in time overlapping.

Optionally, as an embodiment, when the start time of receiving the scheduling information on the first channel is the same as the start time of receiving the downlink data frame on the second channel, the length of time T of the uplink data frame The time length T _{DL of the} _UL and the downlink data frame satisfies one of the following relations (9) to (12):

Tt+T ₁ +T _UL +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (9)

Tt+T ₁ +T _UL +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (10)

Tt+T ₁ +T _UL ^MAX +T ₂ +T _{ACK_UL} <T _DL +T ₃ +T ₄ (11)

Tt+T ₁ +T _UL ^MIN +T ₂ >T _DL +T ₃ +T ₄ +T _{ACK_DL} (12)

Optionally, as an embodiment, the time lengths of the first time period, the second time period, the third time period, and the fourth time period are equal and are all short inter-frame intervals SIFS.

It should be understood that the site 800 in accordance with an embodiment of the present invention may correspond to the site 200 in an embodiment of the present invention, and that the above and other operations and/or functions of the various modules in the site 800 are respectively implemented to implement the methods of FIGS. 10 and 11. The corresponding process of 500 is not repeated here for brevity.

Therefore, the station in the embodiment of the present invention receives the scheduling information sent by the access point through the station, and sends an uplink data frame to the access point on the first channel according to the scheduling information. Meanwhile, the station is in the carrier frequency. Receiving, on a second channel different from the first channel, a downlink data frame sent by the access point until the station starts to send the uplink data frame, and acquiring self-interference channel estimation information of the second channel, so that the station can be based on the self-interference The channel estimation information continues to receive the downlink data frame sent by the access point on the second channel, thereby enabling out-of-band full-duplex communication of the communication node, improving the spectrum efficiency of the system, and simplifying system complexity and improving System performance.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, for clarity of hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit is implemented in the form of a software functional unit and sold as a separate product When sold or used, it can be stored on a computer readable storage medium. Based on such understanding, the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any equivalent person can be easily conceived within the technical scope of the present invention by any person skilled in the art. Modifications or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

An access point, comprising:

a sending module, configured to send scheduling information to the first station on the first channel, where the scheduling information is used to schedule the first station to send an uplink data frame;

An acquiring module, configured to acquire self-interference channel estimation information of the first channel in a first time period after the sending, by the sending module, the scheduling information;

a receiving module, configured to receive, according to the self-interference channel estimation information of the first channel acquired by the acquiring module, the first station, according to the scheduling information, on the first channel after the first time period The uplink data frame sent;

The sending module is further configured to: send a downlink data frame to the second station on the second channel, where the uplink data frame received by the receiving module and the downlink data frame sent by the sending module are in time Part or all overlap, and the first channel is different from the carrier frequency of the second channel.
The access point according to claim 1, wherein the sending module is specifically configured to:

Transmitting physical layer signaling to the first station on the first channel, where the physical layer signaling carries the scheduling information; or

Transmitting, by the first channel, a media access control MAC frame to the first station, where the MAC frame carries the scheduling information.
The access point according to claim 1 or 2, wherein the scheduling information sent by the sending module comprises at least one of the following information: an uplink data transmission duration of each of the first stations, The uplink data transmission duration, the uplink data transmission duration upper limit, and the uplink data transmission duration lower limit of the first station with the largest uplink data transmission duration.
The access point according to any one of claims 1 to 3, wherein the sending module sends the start time of the scheduling information on the first channel and transmits on the second channel. The starting moments of the downlink data frames are the same.
The access point according to any one of claims 1 to 4, wherein the sending module is further configured to: after the receiving module receives the uplink data frame and after a second time period, The first station sends an uplink response frame;

The receiving module is further configured to: after the sending module sends the downlink data frame, and after a third time period, receive a downlink response frame sent by the second station, where the uplink response frame And the downlink response frames do not overlap each other in time.
The access point according to claim 5, wherein the first station and the second station do not include the same station, and the start time of transmitting the scheduling information on the first channel When the start time of transmitting the downlink data frame on the second channel is the same, the time length T UL of the uplink data frame and the time length T DL of the downlink data frame satisfy the following relationship (1) to One of (4):

Tt+T 1 +T UL +T 2 +T ACK_UL <T DL +T 3 (1)

Tt+T 1 +T UL +T 2 >T DL +T 3 +T ACK_DL (2)

Tt+T 1 +T UL MAX +T 2 +T ACK_UL <T DL +T 3 (3)

Tt+T 1 +T UL MIN +T 2 >T DL +T 3 +T ACK_DL (4)

Wherein T 1 , T 2 , and T 3 represent time lengths of the first time period, the second time period, and the third time period, respectively; Tt represents a length of time during which the scheduling information is sent; T ACK — UL represents The length of time of the uplink response frame; T ACK_DL indicates the length of time of the downlink response frame; T UL MAX indicates the upper limit of the uplink data transmission duration; and T UL MIN indicates the lower limit of the uplink data transmission duration.
The access point according to claim 5, wherein when the first site and the second site comprise the same site, the sending module is further configured to:

At the time when the receiving module starts receiving the uplink data frame, suspending sending the downlink data frame to the second station on the second channel, and continuing on the second channel after the fourth time period And transmitting, by the second station, the downlink data frame, so that the second station acquires self-interference channel estimation information of the second channel in the fourth time period.
The access point according to claim 7, wherein a start time of transmitting the scheduling information on the first channel and a start time of transmitting the downlink data frame on the second channel are Meanwhile, the time length T UL of the uplink data frame and the time length T DL of the downlink data frame satisfy one of the following relations (5) to (8):

Tt+T 1 +T UL +T 2 +T ACK_UL <T DL +T 3 +T 4 (5)

Tt+T 1 +T UL +T 2 >T DL +T 3 +T 4 +T ACK_DL (6)

Tt+T 1 +T UL MAX +T 2 +T ACK_UL <T DL +T 3 +T 4 (7)

Tt+T 1 +T UL MIN +T 2 >T DL +T 3 +T 4 +T ACK_DL (8)

Wherein T 1 , T 2 , T 3 , and T 4 represent time lengths of the first time period, the second time period, the third time period, and the fourth time period, respectively; The length of time of the scheduling information; T ACK_UL indicates the length of time of the uplink response frame; T ACK_DL indicates the length of time of the downlink response frame; T UL MAX indicates the upper limit of the uplink data transmission duration; T UL MIN indicates that the uplink data transmission continues The lower limit.
The access point according to any one of claims 5 to 8, wherein the first time period, the second time period and the third time period have the same length of time and are short frames Interval SIFS.
A site characterized by comprising:

a receiving module, configured to receive scheduling information sent by the access point AP on the first channel, where the scheduling information is used by the scheduling station to send an uplink data frame;

a sending module, configured to send the uplink data frame to the AP on the first channel according to the scheduling information after the receiving module receives the scheduling information and after a first time period;

The receiving module is further configured to: receive the downlink data frame sent by the AP on the second channel, until the sending module starts to send the uplink data frame, where the uplink data frame and the sent by the sending module The downlink data frames received by the receiving module partially or completely overlap in time, and the first channel is different from the carrier frequency of the second channel;

An acquiring module, configured to acquire self-interference channel estimation information of the second channel in a fourth time period in which the sending module starts to send the uplink data frame;

The receiving module is further configured to: after receiving the fourth time period, continue to receive the AP sending on the second channel according to the self-interference channel estimation information of the second channel acquired by the acquiring module. The downlink data frame.
The station according to claim 10, wherein the receiving module is specifically configured to:

Receiving, by using the first channel, physical layer signaling sent by the AP, where the physical layer signaling carries the scheduling information; or

Receiving, on the first channel, a media access control MAC frame sent by the AP, where the MAC frame carries the scheduling information.
The station according to claim 10 or 11, wherein the scheduling information received by the receiving module comprises at least one of the following information: an uplink data transmission duration and an uplink data transmission of each scheduled station. The uplink data transmission duration, the uplink data transmission duration upper limit, and the uplink data transmission duration lower limit of the site with the longest duration.
A station according to any one of claims 10 to 12, wherein said The start time of the receiving module receiving the scheduling information on the first channel is the same as the starting time of receiving the downlink data frame on the second channel.
The station according to any one of claims 10 to 13, wherein the receiving module is further configured to: after the sending module sends the uplink data frame and after a second time period, receive the AP The uplink response frame sent;

The sending module is further configured to: after the receiving module receives the downlink data frame, and send a downlink response frame to the AP after a third time period, where the uplink response frame and the downlink response frame are Time does not overlap each other.
The station according to claim 14, wherein a start time of receiving the scheduling information on the first channel is the same as a start time of receiving the downlink data frame on the second channel, The time length T UL of the uplink data frame and the time length T DL of the downlink data frame satisfy one of the following relational expressions (9) to (12):

Tt+T 1 +T UL +T 2 +T ACK_UL <T DL +T 3 +T 4 (9)

Tt+T 1 +T UL +T 2 >T DL +T 3 +T 4 +T ACK_DL (10)

Tt+T 1 +T UL MAX +T 2 +T ACK_UL <T DL +T 3 +T 4 (11)

Tt+T 1 +T UL MIN +T 2 >T DL +T 3 +T 4 +T ACK_DL (12)

Wherein T 1 , T 2 , T 3 , and T 4 represent time lengths of the first time period, the second time period, the third time period, and the fourth time period, respectively; The length of time of the scheduling information; T ACK_UL indicates the length of time of the uplink response frame; T ACK_DL indicates the length of time of the downlink response frame; T UL MAX indicates the upper limit of the uplink data transmission duration; T UL MIN indicates that the uplink data transmission continues The lower limit.
The station according to claim 14 or 15, wherein the first time period, the second time period, the third time period, and the fourth time period are equal in length and both are short Interframe space SIFS.
A method for transmitting data based on out-of-band full duplex, comprising:

And sending, to the first station, scheduling information, where the scheduling information is used to schedule the first station to send an uplink data frame;

Acquiring the self-interference channel estimation information of the first channel in a first time period after the sending the scheduling information;

Receiving, according to the self-interference channel estimation information of the first channel, the uplink data frame that is sent by the first station according to the scheduling information on the first channel after the first time period;

Transmitting, to the second station, a downlink data frame, where the uplink data frame and the downlink data frame partially or completely overlap in time, and carrier frequencies of the first channel and the second channel different.
The method according to claim 17, wherein the sending the scheduling information to the first station on the first channel comprises:

Transmitting physical layer signaling to the first station on the first channel, where the physical layer signaling carries the scheduling information; or

Transmitting, by the first channel, a media access control MAC frame to the first station, where the MAC frame carries the scheduling information.
The method according to claim 17 or 18, wherein the scheduling information comprises at least one of the following: an uplink data transmission duration of each of the first stations, and a maximum duration of uplink data transmission. The uplink data transmission duration, the uplink data transmission duration upper limit, and the uplink data transmission duration lower limit of the first site are described.
The method according to any one of claims 17 to 19, wherein a start time of transmitting the scheduling information on the first channel and a sending of the downlink data frame on the second channel are performed The starting time is the same.
The method according to any one of claims 17 to 20, wherein the method further comprises:

After receiving the uplink data frame and after a second time period, sending an uplink response frame to the first station;

After the downlink data frame is sent and after a third time period, the downlink response frame sent by the second station is received, where the uplink response frame and the downlink response frame do not overlap each other in time.
The method according to claim 21, wherein the first station and the second station do not include the same site, and the start time of transmitting the scheduling information on the first channel is When the start time of sending the downlink data frame on the second channel is the same, the time length T UL of the uplink data frame and the time length T DL of the downlink data frame satisfy the following relation (1) to (4) One of them:

Tt+T 1 +T UL +T 2 +T ACK_UL <T DL +T 3 (1)

Tt+T 1 +T UL +T 2 >T DL +T 3 +T ACK_DL (2)

Tt+T 1 +T UL MAX +T 2 +T ACK_UL <T DL +T 3 (3)

Tt+T 1 +T UL MIN +T 2 >T DL +T 3 +T ACK_DL (4)

Wherein T 1 , T 2 , and T 3 represent time lengths of the first time period, the second time period, and the third time period, respectively; Tt represents a length of time during which the scheduling information is sent; T ACK — UL represents The length of time of the uplink response frame; T ACK_DL indicates the length of time of the downlink response frame; T UL MAX indicates the upper limit of the uplink data transmission duration; and T UL MIN indicates the lower limit of the uplink data transmission duration.
The method according to claim 21, wherein when the first station and the second station comprise the same site, the sending, by the second channel, a downlink data frame to the second station, including:

At the time of starting to receive the uplink data frame, suspending transmitting the downlink data frame to the second station on the second channel, and continuing to the second channel after the fourth time period The second station sends the downlink data frame, so that the second station acquires self-interference channel estimation information of the second channel in the fourth time period.
The method according to claim 23, wherein a start time of transmitting the scheduling information on the first channel is the same as a start time of transmitting the downlink data frame on the second channel, The time length T UL of the uplink data frame and the time length T DL of the downlink data frame satisfy one of the following relational expressions (5) to (8):

Tt+T 1 +T UL +T 2 +T ACK_UL <T DL +T 3 +T 4 (5)

Tt+T 1 +T UL +T 2 >T DL +T 3 +T 4 +T ACK_DL (6)

Tt+T 1 +T UL MAX +T 2 +T ACK_UL <T DL +T 3 +T 4 (7)

Tt+T 1 +T UL MIN +T 2 >T DL +T 3 +T 4 +T ACK_DL (8)

Wherein T 1 , T 2 , T 3 , and T 4 represent time lengths of the first time period, the second time period, the third time period, and the fourth time period, respectively; The length of time of the scheduling information; T ACK_UL indicates the length of time of the uplink response frame; T ACK_DL indicates the length of time of the downlink response frame; T UL MAX indicates the upper limit of the uplink data transmission duration; T UL MIN indicates that the uplink data transmission continues The lower limit.
The method according to any one of claims 21 to 24, wherein the first time period, the second time period, and the third time period have equal lengths of time and are all short interframe spaces. SIFS.
A method for transmitting data based on out-of-band full duplex, comprising:

Receiving scheduling information sent by the access point AP on the first channel, where the scheduling information is used by the scheduling station to send an uplink data frame;

After receiving the scheduling information and after the first time period, sending the uplink data frame to the AP on the first channel according to the scheduling information;

Receiving, by the second channel, a downlink data frame sent by the AP, and starting to send the uplink data frame, where the uplink data frame and the downlink data frame partially or completely overlap in time, and the first channel Different from the carrier frequency of the second channel;

Obtaining self-interference channel estimation information of the second channel in a fourth time period from the start of sending the uplink data frame;

After the fourth time period, the downlink data frame sent by the AP is continued to be received on the second channel according to the self-interference channel estimation information of the second channel.
The method according to claim 26, wherein the receiving the scheduling information sent by the access point AP on the first channel comprises:

Receiving, by using the first channel, physical layer signaling sent by the AP, where the physical layer signaling carries the scheduling information; or

Receiving, on the first channel, a media access control MAC frame sent by the AP, where the MAC frame carries the scheduling information.
The method according to claim 26 or 27, wherein the scheduling information comprises at least one of the following: an uplink data transmission duration of each scheduled station, and a site with a longest uplink data transmission duration. The uplink data transmission duration, the uplink data transmission duration upper limit, and the uplink data transmission duration lower limit.
The method according to any one of claims 26 to 28, wherein a start time of receiving the scheduling information on the first channel and receiving a downlink data frame on the second channel The starting time is the same.
The method according to any one of claims 26 to 29, wherein the method further comprises:

Receiving, by the second time period, after receiving the uplink data frame, receiving an uplink response frame sent by the AP;

After receiving the downlink data frame and after a third time period, sending a downlink response frame to the AP, where the uplink response frame and the downlink response frame do not overlap each other in time.
The method according to claim 30, wherein a start time of receiving the scheduling information on the first channel is the same as a start time of receiving the downlink data frame on the second channel, The time length T UL of the uplink data frame and the time length T DL of the downlink data frame satisfy one of the following relational expressions (9) to (12):

Tt+T 1 +T UL +T 2 +T ACK_UL <T DL +T 3 +T 4 (9)

Tt+T 1 +T UL +T 2 >T DL +T 3 +T 4 +T ACK_DL (10)

Tt+T 1 +T UL MAX +T 2 +T ACK_UL <T DL +T 3 +T 4 (11)

Tt+T 1 +T UL MIN +T 2 >T DL +T 3 +T 4 +T ACK_DL (12)

Wherein T 1 , T 2 , T 3 , and T 4 represent time lengths of the first time period, the second time period, the third time period, and the fourth time period, respectively; The length of time of the scheduling information; T ACK_UL indicates the length of time of the uplink response frame; T ACK_DL indicates the length of time of the downlink response frame; T UL MAX indicates the upper limit of the uplink data transmission duration; T UL MIN indicates that the uplink data transmission continues The lower limit.
The method according to claim 30 or 31, wherein the first time period, the second time period, the third time period, and the fourth time period are equal in length and both are short Interframe space SIFS.