WO2016061725A1

WO2016061725A1 - Wireless full duplex communication method, device, station and access point

Info

Publication number: WO2016061725A1
Application number: PCT/CN2014/088907
Authority: WO
Inventors: 李波; 关巧艳; 李云波
Original assignee: 华为技术有限公司
Priority date: 2014-10-20
Filing date: 2014-10-20
Publication date: 2016-04-28

Abstract

Disclosed are a wireless full duplex communication method, a device, a station and an access point, relating to the technical field of communications, and solving the problem of low throughput and low system spectrum utilisation in a communication process caused by the priority level of a station to act as a second transmission receiving party being determined by a second transmission success proportion when the station is taken as the second transmission receiving party in a same scenario in a full duplex communication process. The method of the present invention comprises: estimating performance gain after a station has accessed a second transmission in a full duplex link; entering a back-off state when the performance gain is greater than a preset gain threshold; if the station does not detect that another station has accessed the second transmission before a back-off duration or a back-off window ends, accessing the second transmission when the back-off duration or the back-off window ends. The present invention is suitable for a station or an access point.

Description

Method, device, station and access point for wireless full duplex communication

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a station, and an access point for wireless full duplex communication.

Background technique

Full-duplex communication means that the device can receive data when transmitting data. CCFD (English: Co-time Co-frequency full duplex, Chinese: simultaneous full-duplex) generates data and receives data simultaneously on the same frequency. The full-duplex approach, which theoretically doubles the system's spectrum utilization and throughput. When a full-duplex link is formed, the device-initiated transmission that first obtains the medium access right is generally referred to as the first transmission, and the first-transmitted sender that is initiated after the first transmission starts and is concurrent with the first transmission. The communication in which the receiver participates is referred to as a second transmission, and the first transmission and the second transmission together form a full duplex link. In the prior art, when a full-duplex link is formed, the first-transmitted receiver is determined as the sender of the second transmission, for example, full-duplex in a Wi-Fi (English: Wireless Fidelity) system. A scenario in which a link is formed is that a STA (English: Station, Chinese: site) initiates the first transmission, and sends data to the AP (English: Access Point, Chinese: access point). After the first transmission starts, the AP starts. Determining, by the other STAs, the receiver of the second transmission, the AP transmitting the second transmitted data to the second transmitting receiver while receiving the first transmitted data; the AP determining the second sending receiver is: the AP maintaining the record a weight list of STAs that may become the second transmitting receiver, the weight of the STA indicating that in a full-duplex link having a specific first transmission combination from the first transmitting sender to the first transmitting receiver, When the STA is the second transmission success rate of the second transmission receiver, the AP selects the second transmission receiver according to the weight of the STA that may become the second transmission receiver in the list, and the greater the weight, the second transmission receiver access two The higher the priority of the transmission; after the AP determines the STA of the second transmitting receiver, it transmits data to the second transmitting and receiving STA while receiving the data transmitted by the first transmitting sender STA.

In the prior art, at least the following problem exists: in the case of a large number of channel interferences, although the second transmission is successful, the throughput in the communication process is low, and the system spectrum utilization rate is also low, if the AP only has roots According to the success ratio of the second transmission when the station once used as the second transmission receiver in the full-duplex link having the specific first transmission combination from the first transmitting sender to the first transmitting receiver Its priority as the second sender and receiver will reduce the throughput and system spectrum utilization during communication.

Summary of the invention

Embodiments of the present invention provide a method, an apparatus, a station, and an access point for wireless full-duplex communication, which can solve the problem that the second transmission succeeds when the station is in the same scenario as the second transmission receiver in the full-duplex communication process. The ratio determines its priority as the second transmitting receiver, resulting in low throughput during communication and low system spectrum utilization.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In a first aspect, an embodiment of the present invention provides a method for wireless full duplex communication, including:

Estimating a performance gain of the second transmission after the current station accesses the full duplex link, the full duplex link including the first transmission and the second transmission, the first transmission and the second transmission being the same Frequency

When the performance gain is greater than a preset gain threshold, entering a backoff state, wherein the performance gain is negatively related to a backoff duration or a backoff window, the backoff duration or the backoff window is used to indicate that the current site enters a backoff The length of the state;

If the current station does not detect that the other station accesses the second transmission before the end of the backoff period or the end of the backoff window, when the backoff duration or the backoff window ends, accessing the second send.

With reference to the first aspect, in a first possible implementation manner of the first aspect, before the estimating the performance gain of the second station after the current station accesses the full duplex link, the method further includes:

Obtaining a received power p _a of the frame sent by the current station receiving the first transmitted sender;

Obtaining, by the current station, a received power p _{b of} a frame sent by the first transmitting receiver;

Then, the performance gain after estimating that the current site accesses the full duplex link includes:

The performance gain is estimated from the p _a and the p _b .

In conjunction with the first possible implementation of the first aspect, in a second possible implementation of the first aspect, the estimating the performance gain according to the p _a and the p _b includes:

According to the formula

The performance gain is calculated, where G represents the performance gain.

With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, before the estimating a performance gain of the second station after the current station accesses the full duplex link, The method also includes:

Obtaining, by the first transmitting receiver, a received power p _{c of} a frame sent by the first transmitting sender;

Then, the estimated performance gain after the second transmission in the current station access full-duplex link includes:

The performance gain is estimated from the p _a , the p _{b ,} and the p _c .

In conjunction with the third possible implementation of the first aspect, in a fourth possible implementation of the first aspect, the method further includes:

Determining whether the p _c is greater than a first power threshold, where the first power threshold is preset;

When the p _{c is} greater than the first power threshold, the estimating the performance gain according to the p _a , the p _{b ,} and the p _c includes:

According to the formula

Calculating the performance gain, where G represents the performance gain;

When the p _{c is} not greater than the first power threshold, the estimating the performance gain according to the p _a , the p _{b ,} and the p _c includes:

According to the formula

Calculate the performance gain.

In conjunction with the third possible implementation of the first aspect, in a fifth possible implementation manner of the first aspect, the method further includes:

Determining whether the p _c is less than a second power threshold, where the second power threshold is preset;

When the p _{c is} less than the second power threshold, the estimating the performance gain according to the p _a , the p _{b ,} and the p _c includes:

According to the formula

Calculating the performance gain, where G represents the performance gain;

When the p _{c is} not less than the second power threshold, determining whether the p _c is greater than a third power threshold, the third power threshold is preset, and the third power threshold is greater than the second power threshold ;

When the p _{c is} greater than the third power threshold, the estimating the performance gain according to the p _a , the p _{b ,} and the p _c includes:

According to the formula

Calculating the performance gain;

When the p _{c is} not greater than the third power threshold, the estimating the performance gain according to the p _a , the p _{b ,} and the p _c includes:

According to the formula

Calculate the performance gain.

First possible implementation of the first aspect, in the sixth embodiment may be achieved in a first aspect, the p _a request is acquired by the current RTS transmitting station by listening to the sender of transmission of the first transmission Or, the p _a is preset for the current site;

The p _{b is} acquired by the current station by listening to the permission to send CTS sent by the receiver of the first transmission, or the p _b is preset for the current site.

With reference to the third possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the p _c is obtained by the current site from the indication information sent by the first sending receiver, The indication information is sent by the first transmitted receiver or by the allowed CTS.

With reference to the first aspect, in an eighth possible implementation manner of the first aspect, the estimating a performance gain after the second transmission in the current station accessing the full-duplex link includes:

Estimating the performance gain according to the historical information, where the historical information is a performance gain after the second transmission in the current station access history full-duplex link before the current time, the history of the full-duplex link a transmitting sender is the same as the first transmitting sender of the full-duplex link, and the first transmitting receiver of the historical full-duplex link is the same as the first transmitting receiver of the full-duplex link .

With reference to the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner of the first aspect, the performance gain of the current station after accessing the second full transmission in the historical full duplex link is The first transmission rate and the second transmission rate of the historical full duplex link are determined.

In a second aspect, an embodiment of the present invention provides a method for wireless full duplex communication, including:

Determining a performance gain after the second transmission in each of the remaining stations accessing the full duplex link except for the station included in the first transmission, the full duplex link including the first transmission and the second transmission, The first transmission and the second transmission are simultaneously performed at the same frequency;

Determining a maximum value of performance gains after the second transmission in the full duplex link of each of the remaining stations except the first transmission included station;

When a maximum value of the performance gains is greater than a preset gain threshold, a station corresponding to a maximum value of the performance gains is accessed to the second transmission.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the determining, after the second transmission, the performance gain of the second transmission in each of the other stations except the first transmission includes:

Determining, according to the historical information, a performance gain after the second transmission in each full-link link except for the station included in the first transmission, where the historical information is before the current time, except for the first sending Site access history performance gain after a second transmission in a full-duplex link, the first sender of the historical full-duplex link being the same as the first sender of the full-duplex link, and The first transmitting and receiving party of the historical full duplex link is the same as the first transmitting and receiving party of the full duplex link.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the remaining each station except the first transmission includes accessing the historical full duplex link The performance gain after the second transmission is determined according to the first transmission rate and the second transmission rate of the historical full duplex link.

In a third aspect, an embodiment of the present invention provides an apparatus for wireless full duplex communication, including:

An estimating unit, configured to estimate a performance gain after the second transmission in the current station accessing the full-duplex link, where the full-duplex link includes the first sending and the second sending, the first sending and the The second transmission is performed simultaneously at the same frequency;

a backoff unit, configured to enter a backoff state when the performance gain is greater than a preset gain threshold, wherein the performance gain is negatively correlated with a backoff duration or a backoff window, the backoff duration or the The backoff window is used to indicate the duration of the current site entering the backoff state;

An access unit, configured to: when the current station does not detect that the other station accesses the second transmission before the end of the backoff period or the end of the backoff window, when the backoff duration or the backoff window ends, Accessing the second transmission.

In conjunction with the third aspect, in a first possible implementation manner of the third aspect, the device further includes:

An acquiring unit, configured to acquire, by the current station, a received power pa of a frame sent by the first sending sender;

The acquiring unit is further configured to acquire, by the current station, a received power p _{b of} a frame sent by the first sending receiver;

The estimating unit is specifically configured to estimate the performance gain according to the p _a and the p _b .

In conjunction with the first possible implementation of the third aspect, in a second possible implementation manner of the third aspect, the estimating unit is specifically used according to a formula

The performance gain is calculated, where G represents the performance gain.

With the first possible implementation of the third aspect, in a third possible implementation manner of the third aspect, the acquiring unit is further configured to acquire, by the receiver that the first sending, the sender that sends the first sending Received power of the transmitted frame p _c ;

The estimating unit is further configured to estimate the performance gain according to the p _a , the p _{b ,} and the p _c .

In conjunction with the third possible implementation of the third aspect, in a fourth possible implementation manner of the third aspect, the device further includes:

a first determining unit, configured to determine whether the p _c is greater than a first power threshold, where the first power threshold is preset;

When the p _{c is} greater than the first power threshold, the estimating unit is specifically used according to a formula

Calculating the performance gain, where G represents the performance gain;

Calculate the performance gain.

In conjunction with the third possible implementation of the third aspect, in a fifth possible implementation manner of the third aspect, the device further includes:

a second determining unit, configured to determine whether the p _c is smaller than a second power threshold, where the second power threshold is preset;

When the p _{c is} smaller than the second power threshold, the estimating unit is specifically used according to a formula

Calculating the performance gain, where G represents the performance gain;

When the p _{c is} not less than the second power threshold, the second determining unit is further configured to determine whether the p _c is greater than a third power threshold, where the third power threshold is preset, and the third The power threshold is greater than the second power threshold;

When the p _{c is} greater than the third power threshold, the estimating unit is specifically used according to a formula

Calculating the performance gain;

When the p _{c is} not greater than the third power threshold, the estimating unit is specifically used according to a formula

Calculate the performance gain.

Transmission sent by the sender in conjunction with the third aspect of the first possible implementation manner, in a sixth possible implementation manner of the third aspect, the p _a station monitor by the current through the first transmission request RTS Get Or, the p _a is preset for the current site;

The pb is acquired by the current station by listening to the allowable sending CTS sent by the first sending receiver, or the p _b is preset for the current station.

With reference to the third possible implementation manner of the third aspect, in a seventh possible implementation manner of the third aspect, the p _c is obtained by the current station from the indication information sent by the first sending receiver, The indication information is carried by the CTS.

With reference to the third aspect, in an eighth possible implementation manner of the third aspect, the estimating unit is further configured to estimate the performance gain according to the historical information, where the current information is before the current time, the current station accesses Performance gain after the second transmission in the historical full-duplex link, the first transmitting sender of the historical full-duplex link is the same as the first transmitting sender of the full-duplex link, and the history is all The first transmitting receiver of the duplex link is the same as the first transmitting receiver of the full duplex link.

With reference to the eighth possible implementation manner of the third aspect, in a ninth possible implementation manner of the third aspect, the performance gain of the current station after accessing the second full transmission in the historical full duplex link is The first transmission rate and the second transmission rate of the historical full duplex link are determined.

In a fourth aspect, an embodiment of the present invention provides a device for wireless full duplex communication, including:

a determining unit, configured to determine a performance gain after the second transmission in each of the remaining stations connected to the full duplex link except the first transmission included, the full duplex link including the first sending and the The second sending, the first sending and the second sending are simultaneously performed at the same frequency;

The determining unit is further configured to determine a maximum value of performance gains after the second transmission in the full duplex link of each of the remaining stations except the first transmission included station;

And an access unit, configured to: when a maximum value of the performance gains is greater than a preset gain threshold, access a station corresponding to a maximum value of the performance gains to the second transmission.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the determining unit is specifically configured to determine, according to the historical information, each of the remaining stations except the first transmission to access the full duplex link a performance gain after the second transmission, where the historical information is a performance gain after the second transmission in the full-duplex link of each of the stations except the first transmission site before the current time. The first transmitting sender of the historical full-duplex link is the same as the first sending sender of the full-duplex link, and the first transmitting receiver of the historical full-duplex link and the full double The first sender of the worker link is the same.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the remaining each station except the first transmission includes accessing the historical full duplex link The performance gain after the second transmission is determined according to the first transmission rate and the second transmission rate of the historical full duplex link.

In a fifth aspect, an embodiment of the present invention provides a station for wireless full duplex communication, including:

a processor, configured to estimate a performance gain of the second transmission after the current station accesses the full-duplex link, where the full-duplex link includes the first transmission and the second transmission, the first transmission and the The second transmission is performed at the same time; and is configured to enter a back-off state when the performance gain is greater than a preset gain threshold, wherein the performance gain is negatively correlated with the back-off duration or the back-off window, and the back-off duration or The backoff window is used to indicate the duration of the current site entering the backoff state; and is configured to detect that the current station does not detect other stations before the backoff duration or the end of the backoff window The point accesses the second transmission, and when the backoff duration or the backoff window ends, the second transmission is accessed.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the processing unit is further configured to acquire, by the current station, a received power p _{a of a} frame sent by the first sending sender; and configured to obtain said current received power p _b station receiving the frame transmitted by the first transmission recipient; and for estimating the performance gain according to the p _a and p _b.

In conjunction with the first possible implementation of the fifth aspect, in a second possible implementation of the fifth aspect, the processor is further configured to

The performance gain is calculated, where G represents the performance gain.

With reference to the first possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect, the processor is further configured to acquire, by the receiver that the first sending, the sender of the first sending The received power p _{c of the} transmitted frame; and, for estimating the performance gain from the p _a , the p _{b ,} and the p _c .

With reference to the third possible implementation manner of the fifth aspect, in a fourth possible implementation manner of the fifth aspect, the processor is further configured to determine whether the p _c is greater than a first power threshold, the first power threshold And pre-set; and, when the p _{c is} greater than the first power threshold, the estimating the performance gain according to the p _a , the p _b, and the p _c includes: according to a formula

Calculating the performance gain, wherein G represents the performance gain; and, for when the p _{c is} not greater than the first power threshold, the according to the p _a , the p _{b ,} and the p _c estimating the performance gains including: according to the formula

Calculate the performance gain.

With reference to the third possible implementation manner of the fifth aspect, in a fifth possible implementation manner of the fifth aspect, the processor is further configured to determine whether the p _c is less than a second power threshold, the second power threshold And pre-set; and, when the p _{c is} smaller than the second power threshold, the estimating the performance gain according to the p _a , the p _b, and the p _c includes: according to a formula

Calculating the performance gain, where G represents the performance gain; and, for determining whether the p _c is greater than a third power threshold when the p _{c is} not less than the second power threshold, the third The power threshold is preset, the third power threshold is greater than the second power threshold; and, when the p _{c is} greater than the third power threshold, the according to the p _a , the p _b Estimating the performance gain with the p _c includes: according to a formula

Calculating the performance gain; and, when the p _{c is} not greater than the third power threshold, the estimating the performance gain according to the p _a , the p _{b ,} and the p _c includes: formula

Calculate the performance gain.

Transmitting party transmits the first possible implementation manner of the fifth aspect, in a sixth possible implementation manner of the fifth aspect, the p _a current from said first station by listening to the acquired transmission request RTS Or, the p _a is preset for the current site;

With reference to the third possible implementation manner of the fifth aspect, in a seventh possible implementation manner of the fifth aspect, the p _c is obtained by the current station from the indication information sent by the first sending receiver, The indication information is carried by the CTS.

With reference to the fifth aspect, in an eighth possible implementation manner of the fifth aspect, the processor is further configured to estimate the performance gain according to the historical information, where the current information is before the current time, the current site access Performance gain after the second transmission in the historical full-duplex link, the first transmitting sender of the historical full-duplex link is the same as the first transmitting sender of the full-duplex link, and the history is all The first transmitting receiver of the duplex link is the same as the first transmitting receiver of the full duplex link.

With reference to the eighth possible implementation manner of the fifth aspect, in a ninth possible implementation manner of the fifth aspect, the performance gain of the second station after the current station accesses the historical full duplex link is The first transmission rate and the second transmission rate of the historical full duplex link are determined.

In a sixth aspect, an embodiment of the present invention provides an access point for wireless full duplex communication, including:

a processor, configured to determine a performance gain after the second transmission in each of the remaining stations in the full duplex link except for the first transmission included station, where the full duplex link includes the first transmission and the The second sending, the first sending and the second sending are simultaneously performed at the same frequency; and, for determining that each of the remaining stations except the first transmitting station accesses the full duplex link a maximum value of the performance gains after the second transmission; and, when the maximum value of the performance gains is greater than a preset gain threshold, accessing the site corresponding to the maximum value of the performance gains to the second send.

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the processor is further configured to determine, according to the historical information, each of the remaining stations except the first transmission to access the full duplex link a performance gain after the second transmission, where the historical information is a performance gain after the second transmission in the full-duplex link of each of the stations except the first transmission site before the current time. The first transmitting sender of the historical full-duplex link is the same as the first sending sender of the full-duplex link, and the first transmitting receiver of the historical full-duplex link and the full double The first sender of the worker link is the same.

With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect, the remaining each station except the first transmission includes accessing the historical full duplex link The performance gain after the second transmission is determined according to the first transmission rate and the second transmission rate of the historical full duplex link.

An embodiment of the present invention provides a method, an apparatus, and a station for wireless full-duplex communication. In the present invention, a station first determines a performance gain after accessing a second transmission before accessing a full-duplex link, when the performance gain is greater than The preset threshold, that is, the communication condition is met, and the performance gain reaches the preset value, the station will compete for access to the full-duplex link, that is, enter the back-off phase. Further, the station detects whether there is another station after entering the back-off state. In the second transmission, since the estimated performance gain is negatively correlated with the backoff duration or the backoff window, the priority of accessing the full duplex link is negatively related to the backoff duration or the backoff window, so if the station is not in the backoff duration or the backoff window ends If the other station accesses the second transmission, it indicates that the backoff duration of the station is the shortest or the backoff window is the smallest, that is, the performance gain after the second transmission is estimated to be the largest, and the station accesses the second transmission when the backoff duration or the backoff window ends. In this way, when the estimated performance gain of the station is greater than the preset threshold and is the maximum value, the second transmission is accessed to ensure the integrity of the full duplex link. Gain and throughput to achieve the desired effect, improve the system spectral efficiency.

An embodiment of the present invention provides a method, an apparatus, and an access point for wireless full-duplex communication. In the embodiment of the present invention, the AP first determines that each of the other stations except the first transmission includes access to the full duplex. a performance gain after the second transmission in the link, and determining a maximum value of the performance gain after the second transmission in each of the remaining stations connected to the full duplex link except for the site included in the first transmission; When the maximum value in the medium is greater than the preset gain threshold, the corresponding station is connected to the second transmission. The AP determines the priority of accessing the second transmission according to the performance gain of the second transmission in the full-duplex link of each station. When the determined maximum performance gain is greater than the preset gain threshold, the communication condition is met, and the performance gain is achieved. When the preset value is used, the corresponding station is connected to the second transmission. Therefore, when the estimated maximum performance gain is greater than the preset threshold, the AP accesses the second transmission corresponding to the maximum performance gain to ensure full duplex. The performance gain and throughput of the link achieve the desired results, improving system spectrum utilization.

DRAWINGS

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

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

2 is a flowchart of a method according to an embodiment of the present invention;

3 is a flowchart of a method according to another embodiment of the present invention;

4 is a flowchart of a method according to another embodiment of the present invention;

FIG. 5 is a schematic timing diagram of another embodiment of the present invention; FIG.

FIG. 6 is a timing diagram of another embodiment of the present invention;

FIG. 7 is a flowchart of a method according to another embodiment of the present invention;

FIG. 8 is a timing diagram of another embodiment of the present invention; FIG.

FIG. 9 is a flowchart of a method according to another embodiment of the present invention;

FIG. 10 is a timing diagram of another embodiment of the present invention; FIG.

11 and FIG. 12 are schematic structural diagrams of a device according to another embodiment of the present invention;

FIG. 13 is a schematic structural diagram of a device according to another embodiment of the present invention; FIG.

FIG. 14 is a schematic structural diagram of a station according to another embodiment of the present invention; FIG.

FIG. 15 is a schematic structural diagram of an access point according to another embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

APs are also called wireless access points or hotspots. The AP is an access point for mobile computer users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors. An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet. At present, the standard adopted by AP is IEEE (English: Institute of Electrical and Electronics Engineers) 802.11 series. Specifically, the AP may be a terminal device or a network device with a Wi-Fi chip. Optionally, the AP may be a device that supports the 802.11ax system. Further, the AP may be configured to support multiple WLANs such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a (English: Wireless Local Area Network, Chinese: Wireless LAN) Standard equipment.

The site can be a wireless communication chip, a wireless sensor, or a wireless communication terminal. For example: mobile phones that support Wi-Fi communication, tablets that support Wi-Fi communication, set-top boxes that support Wi-Fi communication, and computers that support Wi-Fi communication. Optionally, the site can support the 802.11ax system. Further optionally, the site supports multiple WLAN formats such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.

The embodiment of the present invention can be applied to a Wi-Fi system. In the basic network structure of the Wi-Fi system, the network may include multiple basic service sets, and each basic service set may include one AP and multiple associated with the AP. STA, as shown in FIG. 1, STA1, STA2, STA3, and STA4 are sites associated with the AP. For example, the process of forming a full-duplex link in a scenario in which the AP has full-duplex capability and the STA does not have full-duplex capability is taken as an example. The AP has the full-duplex capability and the STA does not have the full-duplex capability. Therefore, the AP simultaneously accesses the first transmission and the second transmission of the full-duplex link, that is, if the first transmission is the STA1 sending data to the AP, the second The sending is an AP sending data to other stations; if the first sending is that the AP sends data to the STA1, the second sending is that the other station sends data to the AP. The first transmission may be DCF (English: Distributed Coordination Function) in 802.11, EDCA (English: Enhanced Distributed Coordination Access, Chinese: enhanced distributed coordination access) and other contention access, or AP access method; the first transmission may be initiated by the AP or by the STA. When the first transmission is initiated by the AP, the STA other than the STA of the first transmission receiver contends for the opportunity as the sender of the second transmission, or the AP determines by scheduling other STAs other than the STA of the first transmission receiver. The sender of the second transmission; when the first transmission is initiated by the STA, the STAs other than the STAs of the first transmission sender compete for the opportunity of the receiver as the second transmission, and then the STA that successfully competes informs the AP of the AP As the second transmitting and receiving party, the AP determines the sender of the second transmission by scheduling other STAs other than the STA of the first transmitting receiver.

An embodiment of the present invention provides a method for wireless full duplex communication, which is used in a station. As shown in FIG. 2, the method includes:

101. The station estimates a performance gain of the second station after the current station accesses the full duplex link.

The full-duplex link includes a first transmission and a second transmission, and the first transmission and the second transmission are simultaneously performed at the same frequency. The execution principal site is the current site.

Optionally, prior to the current site is estimated performance gain access station after a second full duplex link transmission can also obtain the current station receives the first transmission frame sent by the sender of the received power p _a, and the current site Receiving the received power p _b of the frame sent by the first transmitted receiver, that is, p _a is the power of the received frame when the current station receives the frame sent by the sender of the first transmission; p _b is the current station receiving from the first The power of the received frame when the frame sent by the receiver is sent.

Further, the station estimates that the performance gain mode of the second transmission after the current station accesses the full-duplex link may be to estimate the performance gain according to p _a and p _b .

Specifically, the site can be based on the formula

Calculate the performance gain, where G is the performance gain.

Optionally, according to the site prior to p _a and p _b estimation performance gain, you can also get a first recipient receives a frame transmitted from a first transmission sent by the sender of the received power p _c, i.e., a first transmission p _c When the receiver receives the frame transmitted by the first transmitted sender, the power of the received frame, p _{c ,} may be measured by the first transmitted receiver.

Further, the manner in which the station estimates the performance gain according to p _a and p _b can also estimate the performance gain according to p _a , p _b and p _c , and the estimated performance gain is more accurate.

Specifically, the method 1: the station first determines whether the p _c is greater than the first power threshold, and the first power threshold is preset; when the p _{c is} greater than the first power threshold, the station according to the formula

Calculating performance gain; when p _{c is} not greater than the first power threshold, the station is based on the formula

Calculate the performance gain, where G is the performance gain.

Manner 2: The station first determines whether p _c is less than a second power threshold, and the second power threshold is preset; when p _{c is} less than the second power threshold, the station according to the formula

Calculating performance gain; when p _{c is} not less than the second power threshold, the station determines whether p _c is greater than a third power threshold, the third power threshold is preset, and the third power threshold is greater than the second power threshold; when p _{c is} greater than the third Power threshold when the site is based on the formula

Calculate performance gain; when p _{c is} not greater than the third power threshold, the station is based on the formula

Calculate performance gains.

It should be noted that, in the above manner, the performance gains are estimated according to the data obtained in real time, and the error may be generated when the network topology result changes and the channel changes, and the error is estimated according to the historical data. The data is more accurate.

Optionally, the station may obtain p _a by listening to a sending request RTS (Request To Send) sent by the first sending sender, or p _a is preset for the current site; the site may preset p _b or pass The CTS (Clear To Send) acquisition sent by the receiver of the first transmission is monitored. The p _c is obtained by the current station from the indication information sent by the first sending receiver, and the indication information may be carried by the CTS.

Optionally, the method for estimating the performance gain of the second station after the current station accesses the full-duplex link may also estimate the performance gain according to the historical information. The historical information is that the current station access history is full duplex before the current time. Performance gain after the second transmission in the link, the first transmitting sender of the historical full-duplex link is the same as the first transmitting sender of the full-duplex link, and the first transmitting receiver of the historical full-duplex link Same as the first sender of the full-duplex link.

Further, the performance gain after the second transmission in the site access full-duplex link may be determined according to the first transmission rate and the second transmission rate of the historical full-duplex link.

102. When the performance gain is greater than a preset gain threshold, the station enters a retracted state.

The backoff duration or the backoff window is used to indicate the duration of the current site entering the backoff state, and the performance gain is negatively correlated with the backoff duration or the backoff window.

103. If no other station accesses the second transmission is detected before the backoff duration or the backoff window ends, the station accesses the second transmission when the backoff duration or the backoff window ends.

It should be noted that, in the prior art, in the full-duplex communication process, the priority of the second transmission successor is determined by the proportion of the second transmission success when the station is used as the second transmission receiver in the same scenario, due to the success ratio. It only reflects the success, failure, and success ratio of the second transmission. It does not specifically report the specific status of the full-duplex link communication after the second access is sent to the site, and the second is after the station accesses the full duplex. The transmission is successful, but sometimes the performance gain is very low, and the quality of full-duplex communication cannot be guaranteed. In the embodiment of the present invention, the estimated performance gains of the stations are specific values, and then the priority of the second transmission in the full-duplex link is determined according to the performance gain, and the site access full double is more intuitively reflected. The communication status of the second transmission in the work link, the determined priority of the station accessing the second transmission is more accurate, and the performance gain during the full duplex communication is avoided.

In the prior art, during the full-duplex communication process, the priority of the second transmission receiver is determined by the proportion of the second transmission success when the station is used as the second transmission receiver in the same scenario, resulting in throughput during the communication process. Reduced and reduced system spectrum utilization. Compared with the prior art, the site in the present invention first determines the performance gain after accessing the second transmission before accessing the full-duplex link. When the performance gain is greater than the preset threshold, the communication condition is met, and the performance gain reaches the preset. When the value is reached, the station will contend to access the full-duplex link, that is, enter the back-off phase. Further, after the station enters the back-off state, it detects whether another station accesses the second transmission, due to the estimated performance gain and the back-off time or backoff. The window is negatively correlated. The priority of accessing the full-duplex link is negatively related to the back-off duration or the back-off window. Therefore, if the station does not detect the other station accessing the second transmission before the end of the back-off or the back-off window, the site is described. The backoff duration is the shortest or the backoff window is the smallest, that is, the performance gain after the second transmission is estimated to be the largest, and the station accesses the second transmission when the backoff duration or the backoff window ends, so that when the estimated performance gain of the station is greater than the preset threshold and When the maximum value is reached, the second transmission is accessed to ensure that the performance gain and throughput of the full-duplex link achieve the expected effect, and the system spectrum is improved. Rate.

A further embodiment of the present invention provides a method for wireless full-duplex communication, which is used in an AP. As shown in FIG. 3, the method includes:

201. The AP determines, after each second station except the first transmission, the performance gain of the second transmission after accessing the full duplex link.

The full-duplex link includes a first transmission and a second transmission, and the first transmission and the second transmission are simultaneously performed at the same frequency.

Optionally, the method for determining, by the AP, the performance gain after the second transmission in the full-duplex link of each of the other stations except the first one that is included in the first transmission may be: the AP determines, according to the historical information, that the first transmission includes Each of the remaining sites outside the site accesses the performance gain after the second transmission in the full-duplex link. The historical information is the second transmission in the full-duplex link of the site access history except the first transmission before the current time. Performance gain, the first sender of the historical full-duplex link is the same as the first sender of the full-duplex link, and the first sender and the full-duplex link of the historical full-duplex link The first sender is the same as the receiver.

Further, the performance gain after the second transmission in each of the remaining full-duplex links except the first transmission includes the first transmission rate and the second transmission rate of the historical full-duplex link.

202. The AP determines a maximum value of performance gains after the second transmission in each of the remaining stations of the full duplex link except the station included in the first transmission.

203. When the maximum value of the performance gain is greater than a preset gain threshold, the AP accesses the second transmission corresponding to the station corresponding to the maximum value of the performance gain.

It should be noted that, in the prior art, in the full-duplex communication process, the priority of the second transmission successor is determined by the proportion of the second transmission success when the station is used as the second transmission receiver in the same scenario, due to the success ratio. It only reflects the success, failure, and success ratio of the second transmission. It does not specifically report the specific status of the full-duplex link communication after the site accesses the second transmission, and the site accesses the full-duplex. Second, the transmission is successful, but sometimes the performance gain is very low, and the quality of full-duplex communication cannot be guaranteed. In the embodiment of the present invention, the estimated performance gains of the stations are specific values, and then the priority of the second transmission in the full-duplex link is determined according to the performance gain, which is more straightforward. The view shows that the station accesses the second transmitted communication state in the full-duplex link, and the determined station access second transmission priority is more accurate, avoiding the situation that the performance gain during the full-duplex communication is too low.

In the prior art, during the full-duplex communication process, the priority of the second transmission receiver is determined by the proportion of the second transmission success when the station is used as the second transmission receiver in the same scenario, resulting in throughput during the communication process. Reduced and reduced system spectrum utilization. Compared with the prior art, in the embodiment of the present invention, the AP first determines the performance gain of the second transmission after accessing each of the stations in the full-duplex link except for the station included in the first transmission, and determines the first The maximum of the performance gains after the second transmission of each of the remaining stations connected to the included station is transmitted; when the maximum value of the performance gain is greater than the preset gain threshold, the corresponding station is Accessing the second transmission. The AP determines the priority of accessing the second transmission according to the performance gain of the second transmission in the full-duplex link of each station. When the determined maximum performance gain is greater than the preset gain threshold, the communication condition is met, and the performance gain is achieved. When the preset value is used, the corresponding station is connected to the second transmission. Therefore, when the estimated maximum performance gain is greater than the preset threshold, the AP accesses the second transmission corresponding to the maximum performance gain to ensure full duplex. The performance gain and throughput of the link achieve the desired results, improving system spectrum utilization.

A further embodiment of the present invention provides a method for wireless full-duplex communication, for example, a scenario in which an AP has full-duplex capability and an STA does not have full-duplex capability. The first transmission in the full-duplex link takes the data transmission between the STA1 and the AP as an example. The first transmission may be initiated by the AP, or the first transmission may be initiated by the STA1, which may be determined by means of contention or scheduling. Full-duplex capability, which defaults to the sender or receiver of the second transmission, that is, when the first transmission is initiated by the AP, the STA other than STA1 is used as the sender of the second transmission through the contention or scheduling mode; When STA1 initiates the first transmission, the STA is notified by other STAs other than STA1 through the contention or scheduling mode, and the AP selects other STAs as the second transmission receiver. In the embodiment of the present invention, the first transmission is initiated by the AP, that is, the AP is the sender of the first transmission and the receiver of the second transmission, and STA1 is the receiver of the first transmission, and other STAs other than STA1 compete for the second transmission. For example, the sender is STA2 indicating that the contention is the sender of the second transmission. As shown in FIG. 4, the method includes:

301. STA2 listens to the first transmitted RTS and CTS.

It should be noted that the AP may access the first in a competitive manner such as DCF and EDCA in 802.11. The sending or the scheduling method is used to access the first sending. In the embodiment of the present invention, the AP contends for the access, and the AP initiates the first sending, and becomes the first sending sender, and sends the RST to the STA1, and the STA1 is sent as the first sending. The receiving party, after receiving the RTS, replies to the CTS. After receiving the CTS, the AP waits for the SIFS (Short Interframe Space) and starts transmitting the first data DATA. The first DATA is sent by the sender to the first transmission. The square data indicates the length of the first DATA in the preamble preamble.

FIG. 5 is a timing diagram of an embodiment of the present invention. The upper part of the dotted line is the total timing diagram of the system, and the lower part of the dotted line is the timing diagram of AP, STA1, and STA2 respectively. In the figure, DIFS (Distributed Inter-frame Spacing) is distributed. (Interframe interval) is the time for waiting for the channel to be idle; BO (Backoff) is the backoff phase when the AP contends to initiate the first transmission; after the AP backoff is finished, the contention is the sender of the first transmission, and the RTS is sent to STA1. At the same time, STA1 receives the RTS, STA2 listens to the first sent RTS; after waiting for the SIFS, STA1 replies to the CTS, and the AP receives the CTS, and STA2 listens to the first transmitted CTS.

302. STA2 determines whether the channel satisfies the condition for forming a full-duplex link. If the channel satisfies the condition for forming a full-duplex link, step 303 is performed. If the channel does not satisfy the condition for forming a full-duplex link, step 301 is performed. .

The condition that the full-duplex link can be formed is that the self-interference of the first transmission sent by the AP to the second reception can be eliminated to the communicable range, and the interference of the second transmission to the reception of the first transmission is permissible in the communication. range.

303. The STA2 acquires the received power p _a of the frame sent by the receiving AP and the received power p _b of the frame sent by the receiving STA1.

STA2 can obtain p _a and p _b through the RTS and CTS that are heard. When STA2 cannot detect the RTS, the value of p _a can be determined as a preset value. When STA2 cannot detect the CTS, The value of p _b can be determined as a preset value, for example, let p _b be -82 dBm.

304. The STA2 acquires the received power p _c of the frame sent by the receiving AP measured by the STA1.

Wherein the indication information transmitted by the STA1 STA2 may obtain p _c, for example, the STA1 carried p _c in the CTS, STA2 by step 301 listens CTS, the CTS can be carried obtain p _c.

305. The STA2 pre-estimates the performance gain of accessing the full-duplex link.

The STA2 pre-estimates the performance gain of the full-duplex link. The following two methods are used as an example in the embodiment of the present invention.

Method 1: Calculate the performance gain G by p _a and p _b according to a specific function, for example, according to the formula

Calculation.

It should be noted that, when the G is estimated by using the mode 1, it is not necessary to perform step 304.

Manner 2: preset at least one p _c threshold, compare the obtained p _c value with a threshold, and use different functions in different cases to calculate the performance gain G by p _a , p _{b ,} and p _c .

For example, let p _{c have} a threshold of -54 dBm, and when the obtained p _c value is greater than -54 dBm, according to the formula

Calculate the performance gain; when the obtained p _c value is not greater than -54dBm, according to the formula

Calculate performance gains.

For another example, let the two thresholds of p _c be -58.4 dBm and -52.5 dBm, respectively, when the obtained p _c value is greater than -52.5 dBm, according to the formula

Calculate the performance gain; when the obtained p _c value is less than -52.5dBm and greater than -58.4dBm, according to the formula

Calculate the performance gain; when the obtained p _c value is less than -58.4dBm, according to the formula

Calculate performance gains.

306. STA2 determines whether the estimated performance gain is greater than a gain threshold. If the estimated performance gain is greater than the gain threshold, step 307 is performed; otherwise, step 301 is performed.

STA2 compares the estimated performance gain with the gain threshold. When the estimated performance gain is greater than the gain threshold, STA2 accesses the second transmission, and the performance gain of the full-duplex link is guaranteed.

307. After the AP sends the preamble preamble of the first DATA, STA2 enters a backoff phase.

The duration of the backoff phase may be represented by a backoff window or a backoff duration. The greater the performance gain, the shorter the backoff duration or the smaller the backoff window. Backoff window size CW (Contending Window, The competition window 2 and the performance gain G are monotonically decreasing functions, CW2=16*(2/G-1). The larger the G, the smaller the CW2, and the higher the priority of STA2 accessing the second transmission. In the timing diagram of FIG. 5, P is a phase in which the AP transmits the preamble of the first DATA after waiting for the SIFS, and then the STA2 enters the BO2 backoff phase.

308. The STA2 determines, in the backoff phase, whether another station accesses the second sending. If no other station accesses the second sending, step 309 is performed; otherwise, step 301 is performed.

309. When the STA2 backoff phase ends, send the second DATA to the AP.

The second DATA is the data that the STA2 sends to the AP in the second transmission. STA2 can align with the first DATA sent by the AP by adding redundancy before sending the second DATA to the AP. As shown in FIG. 5, the AP receives the second data sent by the STA2 while transmitting the first data to the STA1, and the STA1 receives the first data sent by the AP, and the STA2 sends the second data to the AP after the BO2, in the STA2 sequence. The pad is the content added when the first DATA sent by the AP is aligned by adding redundancy.

310. The STA2 waits for the ACK of the AP reply after waiting for the SIFS.

As shown in FIG. 5, when STA2 receives the ACK replied by the AP, STA1 replies to the ACK, and the AP also receives the ACK replied by STA1.

It should be noted that, in the embodiment of the present invention, the first sending is an AP sending data to the STA1 as an example. When the first sending is the STA1 sending data to the AP, the STA1 is the first sending sender, and the AP is the first sending. The receiving party and the second transmitting sender, in the data processing process in which STA2 competes as the receiving party of the second transmission, in step 309, when the STA2 backoff phase ends, the ARTS is sent an ARTS (Announcement Request To Send). And then wait for SIFS, receive the ACTS (Announcement Clear To Send) sent by the AP to determine that the contention becomes the receiver of the second transmission; after waiting for the SIFS, STA1 sends the first DATA to the AP, and the AP receives the first DATA. And sending the second DATA, the STA2 receiving AP sends the second DATA, and after the DATA receiving ends the SIFS time, the ACK is returned to the AP, and the AP replies to the STA1 and receives the ACK replied by the STA2, and the STA1 receives the ACK replied by the AP, in the process, Step 310 needs to be performed, and the timing diagram is as shown in FIG. 6.

It should be noted that, in the prior art, the ratio of the second transmission success is determined by the ratio of the second transmission success when the station is the second transmission receiver in the same scenario in the full duplex communication process. The first level, because the success rate only reflects the success, failure, and success ratio of the second transmission, and can not specifically report the specific state of the full-duplex link communication after the second access of the station is accessed, and the site access is full. Although the second transmission succeeds after duplexing, sometimes the performance gain is low, and the quality of full-duplex communication cannot be guaranteed. In the embodiment of the present invention, the estimated performance gains of the stations are specific values, and then the priority of the second transmission in the full-duplex link is determined according to the performance gain, and the site access full double is more intuitively reflected. The communication status of the second transmission in the work link, the determined priority of the station accessing the second transmission is more accurate, and the performance gain during the full duplex communication is avoided.

In the prior art, during the full-duplex communication process, the priority of the second transmission receiver is determined by the proportion of the second transmission success when the station is used as the second transmission receiver in the same scenario, resulting in throughput during the communication process. Reduced and reduced system spectrum utilization. Compared with the prior art, in the embodiment of the present invention, the station first determines the performance gain after accessing the second transmission before accessing the full duplex link. When the performance gain is greater than the preset threshold, that is, the communication condition is met, the station only The access to the full-duplex link will enter the back-off phase. Further, after the station enters the back-off state, it detects whether another station accesses the second transmission. The larger the estimated performance gain, the shorter the back-off duration or the back-off window. The smaller the priority, the higher the priority of accessing the full-duplex link. Therefore, if the station does not detect the other station accessing the second transmission before the end of the back-off or the back-off window, the site has the shortest back-off or the minimum back-off window. That is, it is estimated that the performance gain after accessing the second transmission is the largest, so that the station accesses the second transmission when the backoff duration or the backoff window ends, and the performance gain of the full duplex link can be guaranteed regardless of whether the network topology changes. The amount achieves the expected effect and improves the system spectrum utilization.

A further embodiment of the present invention provides a method for wireless full-duplex communication, in which a full-duplex link is formed in a scenario in which an AP (Access Point) has full-duplex capability and the STA does not have full-duplex capability. example. In the embodiment of the present invention, the first transmission is initiated by the AP, and the STAs other than STA1 contend for the second transmission as an example, and STA2 indicates that the competition is the second transmission sender, and there is no scenario in which the RTS and the CTS interact. As shown in FIG. 7, the method includes:

401. The STA2 listens to the preamble preamble of the first sending DATA.

The AP first obtains the medium access right, and the timing diagram is as shown in FIG. 8. After the BO1 phase, the first DATA preamble is sent to the STA1. After STA2 receives the preamble of the first DATA, Knowing that they have access to the second transmission, they start competing for the second transmission.

402. STA2 estimates the performance gain of accessing the full duplex link.

The estimation method of the performance gain G is as follows: STA2 maintains a performance gain list, as shown in Table 1, the list records the last n times of the specific combination of the link with the STA1 and the AP, and STA2 is used as the second transmission. Forming the performance gain G _1,2...n ' of the full-duplex link, after STA2 queries G _1,2...n ' from the list, the current STA2 can be estimated to access the full-duplex link through a mathematical algorithm. Performance gain.

For example, calculate the average of G _1,2...n '

Table I

STA2STA2	G₁’G ₁ '	G₂’G ₂ '	G₃’G ₃ '	G₄’G ₄ '	G₅’G ₅ '	G₆’G ₆ '	G₇’G ₇ '	G₈’G ₈ '	G₉’G ₉ '	G₁₀’G ₁₀ '
STA2STA2	G₁’G ₁ '	G₂’G ₂ '	G₃’G ₃ '	G₄’G ₄ '	G₅’G ₅ '	G₆’G ₆ '	G₇’G ₇ '	G₈’G ₈ '	G₉’G ₉ '	G₁₀’G ₁₀ '	STA1STA1	1.521.52	1.641.64	1.701.70	1.661.66	1.781.78	1.681.68	1.641.64	1.641.64	1.681.68	1.601.60

Optionally, G ₁ , _2...n ' is related to the rate R1 of the first transmission and the rate R2 of the second transmission, and whether the first transmission and the second transmission are successful. Specifically, when the first transmission in the full duplex link is unsuccessful, G' is 0; when the first transmission in the full duplex link is successful, the calculation formula is G'=(R1+R2)/R1, which is required. It is stated that when the second transmission is unsuccessful, R2=0.

403. STA2 determines whether the estimated performance gain is greater than a gain threshold. If the estimated performance gain is greater than the gain threshold, step 404 is performed; otherwise, step 401 is performed.

404. After the AP sends the preamble of the first DATA, STA2 enters a backoff phase.

405. STA2 determines, in the backoff phase, whether another station accesses the second sending. If no other station accesses the second sending, step 406 is performed; otherwise, step 401 is performed.

The duration of the backoff phase may be represented by a backoff window or a backoff duration. The greater the performance gain, the shorter the backoff duration or the smaller the backoff window. The backoff window size CW2 and the performance gain G are monotonically decreasing functions, CW2=16*(2/G-1). The larger the G, the smaller the CW2, and the higher the priority of STA2 accessing the second transmission.

406. When the STA2 backoff phase ends, send the second DATA to the AP.

407. The STA2 waits for the ACK of the AP reply after waiting for the SIFS.

It should be noted that the data processing flow from step 403 to step 407 is related to steps 306 to 310. The same is not repeated here.

It should be noted that the meanings of the stages of the DIFS, BO1, P, BO2, and SIFS in the timing diagram shown in FIG. 8 are the same as those in the stages in FIG. 5, and details are not described herein again.

In the prior art, during the full-duplex communication process, the priority of the second transmission receiver is determined by the proportion of the second transmission success when the station is used as the second transmission receiver in the same scenario, resulting in throughput during the communication process. Reduced and reduced system spectrum utilization. Compared with the prior art, in the embodiment of the present invention, STA2 first determines the performance gain after accessing the full-duplex link before accessing the full-duplex link. When the performance gain is greater than the preset threshold, that is, the communication condition is met, The site will enter the back-off phase, that is, the STA2 enters the back-off phase. Further, after entering the back-off state, STA2 detects whether another station accesses the second transmission. The larger the estimated performance gain, the shorter the back-off duration or The smaller the backoff window is, the higher the priority of accessing the full-duplex link. Therefore, if the station does not detect the other station accessing the second transmission before the back-off time or the back-off window ends, the station back-off duration is the shortest or the back-off window. The minimum, that is, the performance gain after the second transmission is estimated to be the largest, so that the station accesses the second transmission when the back-off time or the back-off window ends, and the performance of the full-duplex link can be guaranteed regardless of whether the network topology changes. Gain throughput achieves the desired results and improves system spectrum utilization.

A further embodiment of the present invention provides a method for forming a full-duplex link in a scenario in which the AP has full-duplex capability and the STA does not have full-duplex capability. In the embodiment of the present invention, the first sending is initiated by the sender that is sent by the STA1 as the first sending, and the AP is the receiving party and the second sending of the first sending. The sending sender, other STAs other than STA1, uses the AP scheduling as the sender of the second transmission as an example, and STA2, STA3, and STA4 indicate that the AP can be scheduled as the sender of the second transmission, and there is no scenario in which the RTS and the CTS interact. As shown in FIG. 9, the method includes:

501. After receiving the preamble of the first DATA, the AP determines that STA2, STA3, and STA4 access the performance gain of the second transmission.

It should be noted that, after the STA obtains the medium access right, the STA sends the preamble of the first DATA to the AP; after receiving the preamble of the first DATA, the AP determines the performance gain of the STA2, STA3, and STA4 to access the second transmission, and the timing diagram is as follows. Figure 10 shows.

A performance gain list can be maintained in the AP. In the scenario where the first transmission is the AP and the STA1, the STA2, STA3, and STA4 access the performance gain G' of the second transmission, for example, Table 2.

Table II

STA1STA1	G₁’G ₁ '	G₂’G ₂ '	G₃’G ₃ '	G₄’G ₄ '	G₅’G ₅ '	G₆’G ₆ '	G₇’G ₇ '	G₈’G ₈ '	G₉’G ₉ '	G₁₀’G ₁₀ '
STA1STA1	G₁’G ₁ '	G₂’G ₂ '	G₃’G ₃ '	G₄’G ₄ '	G₅’G ₅ '	G₆’G ₆ '	G₇’G ₇ '	G₈’G ₈ '	G₉’G ₉ '	G₁₀’G ₁₀ '	STA2STA2	1.521.52	1.641.64	1.701.70	1.661.66	1.781.78	1.681.68	1.641.64	1.641.64	1.681.68	1.601.60
STA3STA3	1.421.42	1.451.45	1.391.39	1.481.48	1.501.50	1.521.52	1.471.47	1.431.43	1.381.38	1.281.28	STA2STA2	1.521.52	1.641.64	1.701.70	1.661.66	1.781.78	1.681.68	1.641.64	1.641.64	1.681.68	1.601.60
STA3STA3	1.421.42	1.451.45	1.391.39	1.481.48	1.501.50	1.521.52	1.471.47	1.431.43	1.381.38	1.281.28	STA4STA4	1.241.24	1.251.25	1.311.31	1.221.22	1.201.20	1.341.34	1.381.38	1.251.25	1.251.25	1.181.18

The AP determines, according to the values in Table 2, the performance gains of STA2, STA3, and STA4 accessing the second transmission, for example, calculating an average value of the corresponding gains of each station.

502. The AP determines a maximum value of performance gains of STA2, STA3, and STA4 accessing the second transmission.

The embodiment of the present invention takes the data recorded in Table 2 as an example. By calculating the average value, it can be concluded that the average performance gain of STA2 is 1.65, the average performance gain of STA3 is 1.43, and the average performance gain of STA4 is 1.26, so the maximum performance is obtained. The gain is 1.65.

503. The AP determines whether the maximum performance gain is greater than a preset gain threshold. If the maximum performance gain is greater than the preset gain threshold, step 504 is performed; otherwise, step 507 is performed.

The maximum performance gain is compared with the preset gain threshold. When the maximum performance gain is greater than the preset gain threshold, a full-duplex link is formed to ensure that the performance gain of the full-duplex link achieves the desired effect.

504. The AP determines a site corresponding to the maximum performance gain.

After determining that STA2, STA3, and STA4 access the performance gain of the second transmission in step 501, the maximum gain value may be obtained according to the value, thereby obtaining the station corresponding to the maximum gain. The embodiment of the present invention takes the data recorded in Table 2 as an example. By calculating the average value, it can be concluded that the average performance gain of STA2 is 1.65, the average performance gain of STA3 is 1.43, and the average performance gain of STA4 is 1.26, so the maximum performance gain corresponds. The site is STA2.

505. The AP sends a second DATA to STA2.

The AP is aligned with the first DATA sent by STA1 by adding redundancy. The AP receives the first DATA while transmitting the second DATA to the STA2.

506. After the AP waits for the SIFS, the AP receives the ACK sent by the STA2.

The ACK sent by the AP to the STA1 while receiving the ACK sent by the STA2.

507. The AP and STA1 perform data transmission.

It can be seen from step 503 that the maximum value of the performance gain calculated in step 501 is less than the preset gain threshold, that is, the full-duplex link cannot form a full-duplex link, and the full-duplex link is no longer formed. Only data transmission between the AP and STA1 is performed.

It should be noted that the meanings of the stages of the DIFS, BO1, P, and SIFS in the timing diagram shown in FIG. 10 are the same as those in the stages in FIG. 5, and details are not described herein again.

In the prior art, during the full-duplex communication process, the station is used as the second transmission in the same scenario. The proportion of the second transmission success at the receiver determines its priority as the second transmission receiver, resulting in a decrease in throughput and a reduction in system spectrum utilization during communication. Compared with the prior art, in the embodiment of the present invention, the AP determines the performance gain of the second transmission after accessing each of the other duplex stations except the first transmission station, and determines the first transmission. Each of the remaining stations outside the included site accesses the maximum of the performance gains after the second transmission in the full-duplex link; when the maximum value of the performance gain is greater than the preset gain threshold, the corresponding station is connected Into the second transmission. The AP first determines the performance gain of the second transmission after the site accesses the full-duplex link except the first transmission, and then corresponds to the maximum value of the performance gain when the maximum value of the performance gain is greater than the preset gain threshold. The site access is sent to the second. In this manner, the AP determines the priority of accessing the second transmission according to the performance gain of the second transmission in the full-duplex link of each station. When the determined maximum performance gain is greater than the preset gain threshold, the corresponding station is connected. Into the second transmission, so that the network topology can ensure the performance gain throughput of the full-duplex link to achieve the expected effect regardless of whether the network topology changes, and improve the system spectrum utilization.

A further embodiment of the present invention provides a device 60 for wireless full duplex communication. As shown in FIG. 11, the device 60 includes:

The estimating unit 61 is configured to estimate a performance gain after the second transmission in the current station accessing the full-duplex link, where the full-duplex link includes the first sending and the second sending, where the first sending and the sending Said that the second transmission is performed simultaneously with the same frequency;

The backoff unit 62 is configured to enter a back-off state when the performance gain is greater than a preset gain threshold, wherein the performance gain is negatively related to a back-off duration or a back-off window, and the back-off duration or the back-off window is used to indicate The duration of the current site entering the retracted state;

The access unit 63 is configured to: when the current station does not detect that the other station accesses the second sending before the end of the backoff period or the end of the backoff window, when the backoff duration or the backoff window ends Accessing the second transmission.

Further, as shown in FIG. 12, the device 60 may further include:

An obtaining unit 64, configured to acquire, by the current station, a received power p _{a of a} frame sent by the first sending sender;

The obtaining unit 64 is further configured to acquire, by the current station, a received power p _{b of} a frame sent by the first sending receiver;

The estimating unit 61 is specifically configured to estimate the performance gain according to the p _a and the p _b .

Further, the estimating unit 61 is specifically configured according to a formula

The performance gain is calculated, where G represents the performance gain.

Further, the acquiring unit 64 is further configured to acquire, by the first sending receiver, the received power p _c of the frame sent by the first sending sender;

The estimating unit 61 is further configured to estimate the performance gain according to the p _a , the p _b and the p _c .

Further, as shown in FIG. 12, the device 60 may further include:

The first determining unit 65 is configured to determine whether the p _c is greater than a first power threshold, where the first power threshold is preset;

When the p _{c is} greater than the first power threshold, the estimating unit 61 is specifically used according to a formula

Calculating the performance gain, where G represents the performance gain;

Calculate the performance gain.

Further, as shown in FIG. 12, the device 60 may further include:

The second determining unit 66 is configured to determine whether the p _c is smaller than a second power threshold, where the second power threshold is preset;

When the p _{c is} smaller than the second power threshold, the estimating unit 61 is specifically used according to a formula

Calculating the performance gain, where G represents the performance gain;

When the p _{c is} not less than the second power threshold, the second determining unit 66 is further configured to determine whether the p _c is greater than a third power threshold, where the third power threshold is preset, where the The three power threshold is greater than the second power threshold;

When the p _{c is} greater than the third power threshold, the estimating unit 61 is specifically used according to a formula

Calculating the performance gain;

When the p _{c is} not greater than the third power threshold, the estimating unit 61 is specifically configured according to a formula

Calculate the performance gain.

The p _{a is} obtained by the current station by listening to the sending request RTS sent by the first sending sender, or the p _a is preset for the current station; the p _{b is} determined by the current allowing the first receiver station by listening to the transmission transmits a CTS transmitted acquisition, or the p _b is set in advance of the current site. The p _c is obtained by the current station from the indication information sent by the first sending receiver, and the indication information is carried by the CTS.

Further, the estimating unit 61 is further configured to estimate the performance gain according to the historical information, where the historical information is a performance gain after the second transmission in the current station access history full-duplex link before the current time. The first transmitting sender of the historical full-duplex link is the same as the first transmitting sender of the full-duplex link, and the first transmitting and receiving parties of the historical full-duplex link and the whole The first sender and receiver of the duplex link are the same.

The performance gain of the second station after the current station accesses the historical full-duplex link is determined according to the first sending rate and the second sending rate of the historical full-duplex link.

In the prior art, during the full-duplex communication process, the priority of the second transmission receiver is determined by the proportion of the second transmission success when the station is used as the second transmission receiver in the same scenario, resulting in throughput during the communication process. Reduced and reduced system spectrum utilization. Compared with the prior art, the device 60 in the embodiment of the present invention first determines the performance gain after accessing the second transmission before accessing the full duplex link. When the performance gain is greater than the preset threshold, that is, the communication condition is met, the device 60 will compete for access to the full-duplex link, that is, enter the back-off phase. Further, the larger the estimated performance gain, the shorter the back-off duration or the smaller the back-off window, the shorter the back-off duration or the smaller the back-off window. The higher the priority of the full-duplex link is, therefore, the device 60 detects whether another device 60 accesses the second transmission after entering the retracted state, and if the device 60 does not detect the other device 60 before the end of the retreat or the end of the back-off window When the second transmission is accessed, the device 60 has the shortest retraction duration or the minimum retreat window, that is, the performance gain after the second transmission is estimated to be the largest, so that the device 60 accesses the second transmission when the retreat duration or the backoff window ends. Regardless of whether the network topology changes, the performance gain throughput of the full-duplex link can be expected to achieve the expected effect, and the system spectrum utilization rate is improved.

A further embodiment of the present invention provides a device 70 for wireless full duplex communication. As shown in FIG. 13, the device 70 includes:

a determining unit 71, configured to determine a performance gain after the second transmission in each of the remaining stations in the full duplex link except for the first transmission included station, where the full duplex link includes the first sending sum The second sending, the first sending and the second sending are performed simultaneously at the same frequency;

The determining unit 71 is further configured to determine a maximum value of performance gains after the second transmission in the full duplex link of each of the remaining stations except the first transmission included;

The access unit 72 is configured to: when a maximum value of the performance gains is greater than a preset gain threshold, access a station corresponding to a maximum value of the performance gains to the second transmission.

Further, the determining unit 71 determines, according to the historical information, a performance gain after the second transmission in each full-duplex link except for the station included in the first transmission, where the historical information is at the current time. Previously, each of the remaining stations except the first transmission includes access performance gains after the second transmission in the historical full-duplex link, and the first transmission sender and the location of the historical full-duplex link The first transmitting sender of the full-duplex link is the same, and the first transmitting receiver of the historical full-duplex link is the same as the first transmitting receiver of the full-duplex link.

The performance gain of the second transmission after accessing each of the other stations except the first transmission including the first full-duplex link according to the first transmission rate of the historical full-duplex link and The second transmission rate is determined.

In the prior art, during the full-duplex communication process, the priority of the second transmission receiver is determined by the proportion of the second transmission success when the station is used as the second transmission receiver in the same scenario, resulting in throughput during the communication process. Reduced and reduced system spectrum utilization. Compared with the prior art, the apparatus 70 in the embodiment of the present invention determines the performance gain of the second transmission after accessing each of the stations in the full duplex link except for the station included in the first transmission, and determines the first The maximum of the performance gains after the second transmission of each of the remaining stations connected to the included station is transmitted; when the maximum value of the performance gain is greater than the preset gain threshold, the corresponding station is Accessing the second transmission. The device 70 first determines a performance gain after the second transmission in the site access full duplex link except the first transmission, and then maximizes the performance gain when the maximum value in the performance gain is greater than the preset gain threshold. The corresponding site accesses the second transmission. In this manner, the device 70 determines the priority of accessing the second transmission according to the performance gain of the second transmission after the access of each station to the full-duplex link, when the determined maximum performance gain is greater than the preset. When the gain threshold is reached, the corresponding station is connected to the second transmission, so that the network topology can ensure the performance gain throughput of the full-duplex link to achieve the expected effect regardless of whether the network topology changes, and improve the system spectrum utilization.

A further embodiment of the present invention provides a station 80 for wireless full-duplex communication. As shown in FIG. 14, the station 80 can be used to implement the steps and methods in the method embodiment of FIG. Site 80 includes an antenna 810, a transceiver 820, a processor 830, and a memory 840. Processor 830 controls the operation of station 80 and can be used to process signals. Memory 840 can include read only memory and random access memory and provides instructions and data to processor 830. Transceiver 820 can be coupled to antenna 810. The various components of station 80 are coupled together by a bus system 850, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 850 in the figure. In particular, processor 830 can store instructions to perform the following process:

The processor 830 is configured to estimate a performance gain after the second transmission in the current station accessing the full-duplex link, where the full-duplex link includes the first sending and the second sending, where the first sending and the sending The second transmission is performed at the same time; and is configured to enter a backoff state when the performance gain is greater than a preset gain threshold, wherein the performance gain is negatively correlated with a backoff duration or a backoff window, and the backoff duration or The backoff window is used to indicate the duration of the current site entering the backoff state; and is configured to: if the current site does not detect other sites accessing the second sending before the backoff duration or the backoff window ends And accessing the second transmission when the backoff duration or the backoff window ends.

Further, the processor 830 is further configured to acquire, by the current station, a received power p _{a of a} frame sent by the first sending sender, and a method for acquiring, by the current station, the first sending The received power p _b of the frame transmitted by the receiver; and, for estimating the performance gain from the p _a and the p _b .

Further, the processor 830 is further configured to

The performance gain is calculated, where G represents the performance gain.

Further, the processor 830 is further configured to acquire a reception power p _c receives the frame sent by the sender of a first transmission sent by the first recipient; and, according to the p _a, the The performance gain is estimated by p _b and the p _c .

Further, the processor 830 is further configured to determine whether the p _c is greater than a first power threshold, where the first power threshold is preset; and, when the p _{c is} greater than the first power threshold Estimating the performance gain according to the p _a , the p _{b ,} and the p _c includes: according to a formula

Calculate the performance gain.

Further, the processor 830 is further configured to determine whether the p _c is less than a second power threshold, where the second power threshold is preset; and, when the P _{c is} less than the second power threshold Estimating the performance gain according to the p _a , the p _{b ,} and the p _c includes: according to a formula

Calculate the performance gain.

The p _{a is} obtained by the current station by listening to the sending request RTS sent by the first sending sender, or the p _a is preset for the current station; the p _{b is} determined by the current allowing the first receiver station by listening to the transmission transmits a CTS transmitted acquisition, or the p _b the current station is set in advance. The p _c is obtained by the current station from the indication information sent by the first sending receiver, and the indication information is carried by the CTS.

Further, the processor 830 is further configured to estimate the performance gain according to the historical information, where the historical information is a performance gain after the second transmission in the current station access history full-duplex link before the current time. The first transmitting sender of the historical full-duplex link is the same as the first transmitting sender of the full-duplex link, and the first transmitting and receiving parties of the historical full-duplex link and the whole The first sender and receiver of the duplex link are the same.

In the prior art, during the full-duplex communication process, the priority of the second transmission receiver is determined by the proportion of the second transmission success when the station is used as the second transmission receiver in the same scenario, resulting in throughput during the communication process. Reduced and reduced system spectrum utilization. Compared with the prior art, in the embodiment of the present invention, the station 80 first determines the performance gain after accessing the second transmission before accessing the full duplex link. When the performance gain is greater than the preset threshold, that is, the communication condition is met, the station 80 will compete for access to the full-duplex link, that is, enter the back-off phase. Further, the larger the estimated performance gain, the shorter the back-off duration or the smaller the back-off window, the shorter the back-off duration or the smaller the back-off window. The higher the priority of the full-duplex link is. Therefore, after entering the back-off state, the station 80 detects whether another station 80 accesses the second transmission. If the station 80 does not detect the other station 80 before the end of the back-off or the back-off window. When the second transmission is accessed, the station 80 has the shortest retreat duration or the minimum retreat window, that is, the performance gain after the second transmission is estimated to be the largest, so that the station 80 accesses the second transmission when the retreat duration or the backoff window ends. Regardless of whether the network topology changes, the performance gain throughput of the full-duplex link can be expected to achieve the expected effect, and the system spectrum utilization rate is improved.

A further embodiment of the present invention provides a station 90 for wireless full-duplex communication. As shown in FIG. 15, the access point 90 can be used to implement the steps and methods in the method embodiment described in FIG. Access point 90 includes an antenna 910, a transceiver 920, a processor 930, and a memory 940. Processor 930 controls the operation of access point 90 and can be used to process signals. Memory 940 can include read only memory and random access memory and provides instructions and data to processor 930. Transceiver 920 can be coupled to antenna 910. The various components of access point 90 are coupled together by a bus system 950, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 950 in the figure. In particular, processor 930 can store instructions to perform the following process:

The processor 930 is configured to determine a performance gain after the second transmission in each of the remaining stations in the full duplex link except for the first transmission included station, where the full duplex link includes the first transmit sum The second sending, the first sending and the second sending are performed simultaneously at the same frequency; and, for determining the location Determining a maximum value of performance gains after the second transmission of each of the remaining stations in the full-duplex link except for the first transmission includes; and, when the maximum value of the performance gain is greater than a preset When the gain threshold is reached, the station corresponding to the maximum value of the performance gains is accessed to the second transmission.

Further, the processor 930 is further configured to determine, according to the historical information, a performance gain after the second transmission in the full duplex link of each of the stations except the first transmission included, where the historical information is Before the current time, each of the remaining stations except the first transmission includes access performance gains after the second transmission in the historical full-duplex link, and the first transmission sender of the historical full-duplex link The first transmitting sender of the full-duplex link is the same as the first transmitting and receiving party of the full-duplex link, and the first transmitting and receiving party of the full-duplex link is the same as the first transmitting and receiving party of the full-duplex link.

In the prior art, during the full-duplex communication process, the priority of the second transmission receiver is determined by the proportion of the second transmission success when the station is used as the second transmission receiver in the same scenario, resulting in throughput during the communication process. Reduced and reduced system spectrum utilization. Compared with the prior art, in the embodiment of the present invention, the AP 90 first determines the performance gain of the second transmission after accessing each of the stations in the full duplex link except for the station included in the first transmission, and determines the first The maximum of the performance gains after the second transmission of each of the remaining stations connected to the included station is transmitted; when the maximum value of the performance gain is greater than the preset gain threshold, the corresponding station is Accessing the second transmission. The AP 90 first determines the performance gain after the second transmission in the site access full duplex link except the first transmission, and then when the maximum value in the performance gain is greater than the preset gain threshold, the maximum value in the performance gain is corresponding. The site access is sent to the second. In this manner, the AP 90 determines the priority of accessing the second transmission according to the performance gain of the second transmission in the full-duplex link of each station. When the determined maximum performance gain is greater than the preset gain threshold, the corresponding station is connected. Into the second transmission, so that the network topology can ensure the performance gain throughput of the full-duplex link to achieve the expected effect regardless of whether the network topology changes, and improve the system spectrum utilization.

It should be understood that in various embodiments of the present invention, the size of the sequence numbers of the above processes is not intended. The order of execution is in 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 construed as limiting the implementation of the embodiments of the present invention. The method, device, station and access point of the wireless full duplex communication provided by the embodiments of the present invention may be applicable to a site or an AP, but are not limited thereto.

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 apparatus and method 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.

The various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the device embodiment, since it is substantially similar to the method embodiment, The description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

One of ordinary skill in the art can understand that all or part of the process of implementing the foregoing embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. All should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

A method for wireless full duplex communication, comprising:

Estimating a performance gain of the second transmission after the current station accesses the full duplex link, the full duplex link including the first transmission and the second transmission, the first transmission and the second transmission being the same Frequency

When the performance gain is greater than a preset gain threshold, entering a backoff state, wherein the performance gain is negatively related to a backoff duration or a backoff window, the backoff duration or the backoff window is used to indicate that the current site enters a backoff The length of the state;

If the current station does not detect that the other station accesses the second transmission before the end of the backoff period or the end of the backoff window, when the backoff duration or the backoff window ends, accessing the second send.
The method according to claim 1, wherein the method further comprises: before the estimating the performance gain of the second station after the current station accesses the full duplex link, the method further comprising:

Obtaining a received power p a of the frame sent by the current station receiving the first transmitted sender;

Obtaining, by the current station, a received power p b of a frame sent by the first transmitting receiver;

Then, the estimated performance gain after the second transmission in the current station access full-duplex link includes:

The performance gain is estimated from the p a and the p b .
The method according to claim 2, wherein the estimating the performance gain according to the p a and the p b comprises:

According to the formula
The performance gain is calculated, where G represents the performance gain.
The method of claim 2, wherein the method further comprises: before the estimating the performance gain of the second station after the current station accesses the full duplex link, the method further comprising:

Obtaining, by the first transmitting receiver, a received power p c of a frame sent by the first transmitting sender;

Then, the estimated performance gain after the second transmission in the current station access full-duplex link includes:

The performance gain is estimated from the p a , the p b , and the p c .
The method of claim 4, wherein the method further comprises:

Determining whether the p c is greater than a first power threshold, where the first power threshold is preset;

When the p c is greater than the first power threshold, the estimating the performance gain according to the p a , the p b , and the p c includes:

According to the formula
Calculating the performance gain, where G represents the performance gain;

When the p c is not greater than the first power threshold, the estimating the performance gain according to the p a , the p b , and the p c includes:

According to the formula
Calculate the performance gain.
The method of claim 4, wherein the method further comprises:

Determining whether the p c is less than a second power threshold, where the second power threshold is preset;

When the p c is less than the second power threshold, the estimating the performance gain according to the p a , the p b , and the p c includes:

According to the formula
Calculating the performance gain, where G represents the performance gain;

When the p c is not less than the second power threshold, determining whether the p c is greater than a third power threshold, the third power threshold is preset, and the third power threshold is greater than the second power threshold ;

When the p c is greater than the third power threshold, the estimating the performance gain according to the p a , the p b , and the p c includes:

According to the formula
Calculating the performance gain;

When the p c is not greater than the third power threshold, the estimating the performance gain according to the p a , the p b , and the p c includes:

According to the formula
Calculate the performance gain.
The method according to claim 2, wherein said p a transmission request transmitting party listening to the first RTS sent by station acquired by the current, or the current to the p a site Pre-set

The p b is acquired by the current station by listening to the permission to send CTS sent by the receiver of the first transmission, or the p b is preset for the current site.
The method according to claim 4, wherein the p c is obtained by the current station from the indication information sent by the first sending receiver, and the indication information is carried by the CTS.
The method according to claim 1, wherein the estimating the performance gain of the second transmission after the current station accesses the full duplex link comprises:

Estimating the performance gain according to the historical information, where the historical information is a performance gain after the second transmission in the current station access history full-duplex link before the current time, the history of the full-duplex link a transmitting sender is the same as the first transmitting sender of the full-duplex link, and the first transmitting receiver of the historical full-duplex link is the same as the first transmitting receiver of the full-duplex link .
The method according to claim 9, wherein the performance gain of the second transmission after the current station accesses the historical full-duplex link is based on a first transmission rate of the historical full-duplex link and The second transmission rate is determined.
A method for wireless full duplex communication, comprising:

Determining a performance gain after the second transmission in each of the remaining stations accessing the full duplex link except for the station included in the first transmission, the full duplex link including the first transmission and the second transmission, The first transmission and the second transmission are simultaneously performed at the same frequency;

Determining a maximum value of performance gains after the second transmission in the full duplex link of each of the remaining stations except the first transmission included station;

When a maximum value of the performance gains is greater than a preset gain threshold, a station corresponding to a maximum value of the performance gains is accessed to the second transmission.
The method according to claim 11, wherein the determining the performance gain after the second transmission in each of the remaining stations of the full duplex link except the first transmission includes:

Determining, according to the historical information, a performance gain after the second transmission in each full-link link except for the station included in the first transmission, where the historical information is before the current time, except for the first sending Site access history performance gain after a second transmission in a full-duplex link, the first sender of the historical full-duplex link being the same as the first sender of the full-duplex link, and The history The first transmitting receiver of the duplex link is the same as the first transmitting receiver of the full duplex link.
The method according to claim 12, wherein each of the remaining stations except the first transmission includes access to the performance gain of the second transmission in the historical full duplex link according to the history. The first transmission rate and the second transmission rate of the full duplex link are determined.
A device for wireless full duplex communication, comprising:

An estimating unit, configured to estimate a performance gain after the second transmission in the current station accessing the full-duplex link, where the full-duplex link includes the first sending and the second sending, the first sending and the The second transmission is performed simultaneously at the same frequency;

The backoff unit is configured to enter a backoff state when the performance gain is greater than a preset gain threshold, wherein the performance gain is negatively correlated with a backoff duration or a backoff window, and the backoff duration or the backoff window is used to indicate Describe the duration of the current site entering the retracted state;

An access unit, configured to: when the current station does not detect that the other station accesses the second transmission before the end of the backoff period or the end of the backoff window, when the backoff duration or the backoff window ends, Accessing the second transmission.
The device according to claim 14, wherein the device further comprises:

An acquiring unit, configured to acquire, by the current station, a received power p a of a frame sent by the sender that is sent by the first sending;

The acquiring unit is further configured to acquire, by the current station, a received power p b of a frame sent by the first sending receiver;

The estimating unit is specifically configured to estimate the performance gain according to the p a and the p b .
The apparatus according to claim 15, wherein said estimating unit is specifically configured according to a formula
The performance gain is calculated, where G represents the performance gain.
The apparatus according to claim 15, wherein the acquiring unit is further configured to acquire, by the first transmitting receiver, a received power p c of a frame sent by the first transmitting sender;

The estimating unit is further configured to estimate the performance gain according to the p a , the p b , and the p c .
The device according to claim 17, wherein the device further comprises:

a first determining unit, configured to determine whether the p c is greater than a first power threshold, where the first power threshold is preset;

When the p c is greater than the first power threshold, the estimating unit is specifically used according to a formula
Calculating the performance gain, where G represents the performance gain;

When the p c is greater than the first power threshold, the estimating unit is specifically used according to a formula
Calculate the performance gain.
The device according to claim 17, wherein the device further comprises:

a second determining unit, configured to determine whether the p c is smaller than a second power threshold, where the second power threshold is preset;

When the p c is smaller than the second power threshold, the estimating unit is specifically used according to a formula
Calculating the performance gain, where G represents the performance gain;

When the p c is not less than the second power threshold, the second determining unit is further configured to determine whether the p c is greater than a third power threshold, where the third power threshold is preset, and the third The power threshold is greater than the second power threshold;

When the p c is greater than the third power threshold, the estimating unit is specifically used according to a formula
Calculating the performance gain;

When the p c is not greater than the third power threshold, the estimating unit is specifically used according to a formula
Calculate the performance gain.
The device according to claim 15, wherein the p a is acquired by the current station by listening to a sending request RTS sent by the first sending sender, or the p a is the current site Pre-set

The p b is acquired by the current station by listening to the allowable sending CTS sent by the receiver of the first sending, or the current site of the p b is preset.
The device according to claim 17, wherein the p c is obtained by the current station from the indication information sent by the first sending receiver, and the indication information is carried by the permission sending CTS.
The apparatus according to claim 14, wherein the estimating unit is further configured to estimate the performance gain according to the historical information, where the historical information is the current station access history full duplex chain before the current time a performance gain after the second transmission in the path, the first transmission sender of the historical full-duplex link is the same as the first transmission sender of the full-duplex link, and the historical full-duplex link The first transmitting receiver is the same as the first transmitting receiver of the full duplex link.
The apparatus according to claim 22, wherein the performance gain of the second transmission after the current station accesses the historical full-duplex link is based on a first transmission rate of the historical full-duplex link and The second transmission rate is determined.
A device for wireless full duplex communication, comprising:

a determining unit, configured to determine a performance gain after the second transmission in each of the remaining stations connected to the full duplex link except the first transmission included, the full duplex link including the first sending and the The second sending, the first sending and the second sending are simultaneously performed at the same frequency;

The determining unit is further configured to determine a maximum value of performance gains after the second transmission in the full duplex link of each of the remaining stations except the first transmission included station;

And an access unit, configured to: when a maximum value of the performance gains is greater than a preset gain threshold, access a station corresponding to a maximum value of the performance gains to the second transmission.
The apparatus according to claim 24, wherein the determining unit is specifically configured to determine, according to the historical information, each of the remaining stations except the first transmitting station to access the second duplex after the full duplex link Performance gain, the historical information is a performance gain after the second transmission in the full-duplex link of each of the stations except the first transmission site before the current time, the historical full double The first transmitting sender of the worker link is the same as the first transmitting sender of the full-duplex link, and the first transmitting receiver of the historical full-duplex link and the first duplex of the full-duplex link A sender is the same as the sender.
The apparatus according to claim 25, wherein the performance gain of the second transmission after the access of each of the stations other than the first transmission includes access to the historical full duplex link according to the history The first transmission rate and the second transmission rate of the full duplex link are determined.
A station for wireless full duplex communication, comprising:

a processor, configured to estimate a performance gain of the second transmission after the current station accesses the full-duplex link, where the full-duplex link includes the first transmission and the second transmission, the first transmission and the The second transmission is performed at the same time; and is configured to enter a back-off state when the performance gain is greater than a preset gain threshold, wherein the performance gain is negatively correlated with the back-off duration or the back-off window, and the back-off duration or The backoff window is used to indicate the duration of the current station entering the backoff state; and is configured to: if the current station does not detect the other station accessing the second transmission before the backoff duration or the end of the backoff window, Then, when the backoff duration or the backoff window ends, the second transmission is accessed.
The station according to claim 27, wherein the processor is further configured to acquire, by the current station, a received power p a of a frame sent by the first transmitted sender, and to obtain the The current station receives the received power p b of the frame transmitted by the first transmitted receiver; and is configured to estimate the performance gain based on the p a and the p b .
The station of claim 28 wherein said processor is further operative according to a formula
The performance gain is calculated, where G represents the performance gain.
The station according to claim 27, wherein the processor is further configured to acquire, by the first transmitting receiver, a received power p c of a frame sent by the first transmitted sender; and The performance gain is estimated from the p a , the p b , and the p c .
The station according to claim 30, wherein the processor is further configured to determine whether the p c is greater than a first power threshold, the first power threshold is preset; and, for the When c is greater than the first power threshold, the estimating the performance gain according to the p a , the p b and the p c includes: according to a formula
Calculating the performance gain, wherein G represents the performance gain; and, for when the p c is not greater than the first power threshold, the according to the p a , the p b , and the p c estimating the performance gains including: according to the formula
Calculate the performance gain.
The station according to claim 30, wherein the processor is further configured to determine whether the p c is less than a second power threshold, the second power threshold is preset; and, for when the p When c is smaller than the second power threshold, the estimating the performance gain according to the p a , the p b and the p c includes: according to a formula
Calculating the performance gain, where G represents the performance gain; and, for determining whether the p c is greater than a third power threshold when the p c is not less than the second power threshold, the third The power threshold is preset, the third power threshold is greater than the second power threshold; and, when the p c is greater than the third power threshold, the according to the p a , the p b Estimating the performance gain with the p c includes: according to a formula
Calculating the performance gain; and, when the p c is not greater than the third power threshold, the estimating the performance gain according to the p a , the p b , and the p c includes: formula
Calculate the performance gain.
The station according to claim 28, wherein said p a transmission request transmitting party listening to the first RTS sent by station acquired by the current, or the current to the p a site Pre-set

The p b is acquired by the current station by listening to the permission to send CTS sent by the receiver of the first transmission, or the p b is preset for the current site.
The station according to claim 30, wherein the pc is obtained by the current station from the indication information sent by the first sending receiver, and the indication information is carried by the CTS.
The station according to claim 27, wherein the processor is further configured to estimate the performance gain according to historical information, wherein the historical information is before the current time, the current site access history full duplex chain a performance gain after the second transmission in the path, the first transmission sender of the historical full-duplex link is the same as the first transmission sender of the full-duplex link, and the historical full-duplex link The first transmitting receiver is the same as the first transmitting receiver of the full duplex link.
The station according to claim 35, wherein the performance gain of the second transmission after the current station accesses the historical full-duplex link is based on a first transmission rate of the historical full-duplex link and The second transmission rate is determined.
An access point for wireless full duplex communication, comprising:

a processor, configured to determine a performance gain after the second transmission in each of the remaining stations in the full duplex link except for the first transmission included station, where the full duplex link includes the first transmission and the The second sending, the first sending and the second sending are simultaneously performed at the same frequency; and, for determining that each of the remaining stations except the first transmitting station accesses the full duplex link Performance gain after two transmissions a maximum value; and, when the maximum value of the performance gains is greater than a preset gain threshold, the station corresponding to the maximum of the performance gains is accessed to the second transmission.
The access point according to claim 37, wherein the processor is further configured to determine, according to the historical information, that each of the remaining stations except the first transmission includes a second transmission in the full duplex link. Performance gain, the historical information is a performance gain after the second transmission in the remaining full-duplex link of each of the stations except the first transmission, before the current time, the history The first transmitting sender of the full-duplex link is the same as the first transmitting sender of the full-duplex link, and the first transmitting receiver of the historical full-duplex link and the full-duplex link The first sender is the same as the receiver.
The access point according to claim 38, wherein each of the remaining stations except the first transmission includes access to the performance gain of the second transmission in the historical full duplex link according to the Determining a first transmission rate and a second transmission rate of a historical full duplex link.