WO2015180047A1

WO2015180047A1 - Method and relevant apparatus for interference elimination

Info

Publication number: WO2015180047A1
Application number: PCT/CN2014/078591
Authority: WO
Inventors: 王铠尧; 杨浔; 刘永俊
Original assignee: 华为技术有限公司
Priority date: 2014-05-28
Filing date: 2014-05-28
Publication date: 2015-12-03
Also published as: CN105794261B; CN105794261A

Abstract

A method and relevant apparatus for interference elimination. The method comprises: sending, by a first access point, data to a first mobile device, the data carrying the amount of data streams used by the first access point sending the data; receiving an interference elimination request when the amount of the data streams used by the data is greater than or equal to the amount of antennae of a second access point, wherein the first access point and the second access point are in a coverage range of each other, and the first access point and the second access point use the same channel for communication; in response to the interference elimination request, acquiring data streams sacrificed by the first access point from the data streams of the first access point; and eliminating the interference of the sacrificed data streams on the first access point, the sacrificed data streams being used by the second access point to communicate with a second mobile device. The present invention can save resources.

Description

Interference cancellation method and related device

Technical field

The present invention relates to the field of communications technologies, and in particular, to an interference cancellation method and related apparatus. Background technique

In mobile communication, when a mobile device (ME) and an access point (AP) need to communicate, it is first necessary to listen to whether the channel is idle, and if so, to communicate, if not, wait for the channel. Communicate after idle. In the above method, only one AP is allowed to communicate with one ME on the same channel at the same time. Currently, the industry has proposed a solution to the problem, which is: when APs using the same channel do not interfere with each other, these APs can be used simultaneously. This channel communicates with MEs in their respective ranges.

However, as the range and number of MEs increases, in order to fully cover the ME network, the APs deployed in the communication network become denser, which will cause multiple APs using the same channel to be in coverage with each other. When one of the APs communicates, it will cause interference to the APs in its coverage area, so that communication cannot be performed, resulting in waste of resources. When the AP uses several data streams for communication, the APs within its coverage area Several data streams will be occupied. In the prior art, the number of data streams that an AP can send is less than or equal to the number of antennas of the AP, and one data can be sent by one data stream or multiple data streams, and one data stream can use one antenna. Multiple antennas can also be used. Summary of the invention

The embodiment of the invention discloses an interference cancellation method and device for saving resources. The first aspect of the embodiment of the present invention discloses an AP, including:

a sending unit, configured to send data to the first ME, where the data carries the number of data streams used by the AP to send the data;

a receiving unit, configured to receive an interference cancellation request when the number of data streams used by the data is greater than or equal to the number of antennas of the interfered AP, where the AP and the interfered AP are in coverage of each other Within the range, and the AP communicates with the interfered AP using the same channel;

An acquiring unit, configured to obtain, according to the interference cancellation request, a data stream that is sacrificed by the AP from a data flow of the AP;

And a eliminating unit, configured to cancel interference of the victim data stream to the AP, where the victim data stream is used by the interfered AP to communicate with the second ME.

With reference to the first aspect of the embodiments of the present invention, in a first possible implementation manner of the first aspect of the embodiments, the receiving unit is specifically configured to receive an interference cancellation request sent by the interfered AP, where the interference is eliminated. Requesting, by the channel matrix of the antenna of the AP to the antenna of the interfered AP, and the number of data streams that the interfered AP expects the AP to sacrifice, the number of the data stream desirous of being sacrificed is less than or equal to The number of antennas of the interfered AP.

With reference to the first possible implementation manner of the first aspect of the embodiments of the present disclosure, in a second possible implementation manner of the first aspect of the embodiments, the acquiring unit includes:

a first determining subunit, configured to determine, according to the interference cancellation request, whether the number of data streams that are expected to be sacrificed is smaller than the number of antennas of the AP, and if yes, the number of data streams that the AP sacrifices is equal to the expected The number of data streams that are sacrificed;

And a first selecting subunit, configured to select, by using the number of the sacrificed data streams, the data stream that is sacrificed by the AP from the data stream of the AP.

With reference to the first possible implementation manner of the first aspect of the embodiments of the present invention, in a third possible implementation manner of the first aspect of the embodiments, the acquiring unit includes:

a second determining subunit, configured to determine, according to the interference cancellation request, whether a sum of the number of data streams desirous of sacrificing and the number of data streams used by the data is greater than an antenna number of the AP, and if yes, The number of data streams sacrificed by the AP is equal to the difference between the number of antennas of the AP and the number of data streams used by the data. If not, the number of data streams sacrificed by the AP is equal to the number of data streams that are expected to be sacrificed;

And a second selecting subunit, configured to select, by using the number of the sacrificed data streams, the data stream that is sacrificed by the AP from the data stream of the AP.

With reference to the second or third possible implementation manner of the first aspect of the embodiments of the present invention, in a fourth possible implementation manner of the first aspect of the embodiments, the sending unit is further configured to The interfered AP sends an identifier of the victimized data stream. With reference to the first aspect of the embodiments of the present invention, in a fifth possible implementation manner of the first aspect of the embodiments, the receiving unit is specifically configured to receive an interference cancellation request sent by a controller, where the interference cancellation request carries a channel matrix of an antenna of the AP to the antenna of the interfered AP and the controller indicating a number of data streams sacrificed by the AP, the number of data streams indicating the victim being determined by the controller based on the The number of data flows that the interfering AP expects the AP to sacrifice is determined, and the number of the data streams desirous of being sacrificed is carried by an interference cancellation request sent by the interfered AP to the controller, where the desired data stream is sacrificed The number is less than or equal to the number of antennas of the interfered AP.

With reference to the fifth possible implementation manner of the first aspect of the embodiments of the present invention, in a sixth possible implementation manner of the first aspect of the embodiments, the acquiring unit is specifically configured to respond to the interference cancellation request, Determining, by the number of data streams that are sacrificed, a data stream that is sacrificed by the AP from a data stream of the AP;

The sending unit is further configured to send an identifier of the victim data stream to the controller.

With reference to the fourth or the sixth possible implementation of the first aspect of the embodiments of the present invention, in a seventh possible implementation manner of the first aspect of the embodiments, the AP further includes:

And an updating unit, configured to update the data stream used by the data when the sum of the number of data streams used by the data and the number of the sacrificed data streams is greater than the number of antennas of the AP.

With reference to the seventh possible implementation of the first aspect of the embodiments of the present invention, in an eighth possible implementation manner of the first aspect of the embodiments, the

a first calculating subunit, configured to calculate, by using the channel matrix, a channel vector of the victim data stream from the AP to the interfered AP

a second calculation subunit, configured to calculate a direction vector orthogonal to a channel vector of each of the sacrificial data streams, the number of the direction vectors being equal to the number of updated data streams used by the data, the direction vector A signal used to multiply the data stream used by the updated data. The second aspect of the embodiments of the present invention discloses an AP, including a processor and a memory, where the memory stores a set of program codes, and the processor is configured to invoke the program code stored in the memory to perform the following operations:

Sending data to the first ME, where the data carries the data stream used by the AP to send the data When the number of data streams used by the data is greater than or equal to the number of antennas of the interfered AP, receiving an interference cancellation request, where the AP and the interfered AP are in coverage of each other, and the AP and the Interfering APs use the same channel for communication;

Retrieving the data stream sacrificed by the AP from the data stream of the AP in response to the interference cancellation request; canceling interference of the victim data stream to the AP, the victim data stream being the interfered AP Used to communicate with the second ME.

With reference to the second aspect of the embodiments of the present invention, in a first possible implementation manner of the second aspect of the embodiment, the manner in which the processor receives the interference cancellation request is specifically:

Receiving an interference cancellation request sent by the interfered AP, where the interference cancellation request carries a channel matrix of an antenna of the AP to an antenna of the interfered AP, and a data stream that the interfered AP expects the AP to sacrifice data stream The number, the number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the interfered AP.

With reference to the first possible implementation manner of the second aspect of the embodiments of the present invention, in a second possible implementation manner of the second aspect of the embodiments, the processor responds to the interference cancellation request, from the AP The manner of obtaining the data stream sacrificed by the AP in the data stream is specifically as follows:

Determining, in response to the interference cancellation request, whether the number of data streams desirous of sacrificing is smaller than the number of antennas of the AP, and if so, the number of data streams that the AP sacrifices is equal to the number of data streams that are expected to be sacrificed;

The data stream sacrificed by the AP is selected from the data stream of the AP by the number of the sacrificed data streams.

With reference to the first possible implementation manner of the second aspect of the embodiments of the present invention, in a third possible implementation manner of the second aspect of the embodiments, the processor responds to the interference cancellation request, from the AP The manner of obtaining the data stream sacrificed by the AP in the data stream is specifically as follows:

Responding to the interference cancellation request, determining whether the sum of the number of data streams expected to be sacrificed and the number of data streams used by the data is greater than the number of antennas of the AP, and if so, the number of data streams sacrificed by the AP is equal to The difference between the number of antennas of the AP and the number of data streams used by the data. If not, the number of data streams sacrificed by the AP is equal to the number of data streams that are expected to be sacrificed;

The AP-saved data stream is selected from the data stream of the AP by the number of the sacrificed data streams. In conjunction with the second or third possible implementation manner of the second aspect of the embodiments of the present invention, in a fourth possible implementation manner of the second aspect of the embodiments, the processor is configured to cancel the data stream of the victim After the interference to the AP, the program code stored in the memory is also used to perform the following operations:

Sending an identifier of the victim data stream to the interfered AP.

With reference to the second aspect of the embodiments of the present invention, in a fifth possible implementation manner of the second aspect of the embodiment, the manner in which the processor receives the interference cancellation request is specifically:

And receiving, by the controller, an interference cancellation request, where the interference cancellation request carries a channel matrix of an antenna of the AP to the antenna of the interfered AP, and a quantity of data flow that the controller indicates that the AP is victimized, Determining the number of data streams that are sacrificed by the controller based on the number of data streams that the interfered AP expects the AP to sacrifice, the number of data streams desirous of being sacrificed being sent by the interfered AP to the The number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the interfered AP.

With reference to the fifth possible implementation manner of the second aspect of the embodiments of the present invention, in a sixth possible implementation manner of the second aspect of the embodiments, the processor responds to the interference cancellation request, from the AP The manner of obtaining the data stream sacrificed by the AP in the data stream is specifically as follows:

Responding to the interference cancellation request, using the number of data streams indicated by the indication to select a data stream that is sacrificed by the AP from a data stream of the AP;

After the processor cancels the interference of the victim data stream to the AP, it is further used to invoke the program code stored in the memory to perform the following operations:

An identification of the victim data stream is sent to the controller.

With reference to the fourth or the sixth possible implementation manner of the second aspect of the embodiments of the present invention, in a seventh possible implementation manner of the second aspect of the embodiments, the processor is configured to respond to the interference cancellation request, After acquiring the data stream sacrificed by the AP from the data stream of the AP, and before canceling the interference of the victim data stream to the AP, the program code stored in the memory is also used to perform the following operations:

The data stream used for the data is updated when the sum of the number of data streams used by the data and the number of sacrificed data streams is greater than the number of antennas of the AP.

With reference to the seventh possible implementation manner of the second aspect of the embodiment of the present invention, in the embodiment of the present invention In an eighth possible implementation of the second aspect, the processor cancels the victim data stream to the

The interference mode of the AP is specifically as follows:

Calculating, by the channel matrix, a channel vector of the victim data stream from the AP to the interfered AP;

Calculating a direction vector orthogonal to a channel vector of each of the sacrificial data streams, the number of direction vectors being equal to the number of updated data streams used for the data, the direction vector being used to multiply the updated The signal transmitted by the data stream used by the data. The third aspect of the embodiment of the present invention discloses an AP, including:

An acquiring unit, when the interfering AP sends data to the first ME, acquiring the number of data flows used by the interfering AP carried by the data to send the data, where the interfering AP and the AP are in coverage of each other, And the interfering AP communicates with the AP by using the same channel;

a sending unit, configured to send an interference cancellation request when the number of data streams used by the data is greater than or equal to the number of antennas of the AP;

a receiving unit, configured to receive an identifier of the data stream that the interference AP sacrifices;

And a communication unit, configured to communicate with the second ME by using the data stream that is discarded by the interference AP that is identified by the identifier.

With reference to the third aspect of the embodiments of the present invention, in a first possible implementation manner of the third aspect, the acquiring unit is further configured to acquire a channel matrix of an antenna of the interfering AP to an antenna of the AP. .

With reference to the first possible implementation manner of the third aspect of the embodiments of the present invention, in a second possible implementation manner of the third aspect of the embodiments, the sending unit is specifically configured to send interference cancellation to the interfering AP. The request, the interference cancellation request carries the number of data streams that the AP expects the victim AP to sacrifice, and the channel matrix, where the number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the AP;

The receiving unit is specifically configured to receive, by the interference AP, an identifier of a data stream that is caused by the interference AP.

With reference to the first possible implementation manner of the third aspect of the embodiments of the present invention, in a third possible implementation manner of the third aspect of the embodiments, the sending unit is specifically configured to send interference to the controller. Deleting a request, the interference cancellation request carrying the number of data streams that the AP expects the victim AP to sacrifice and the channel matrix, where the number of the data streams desirous of being sacrificed is less than or equal to the number of antennas of the AP ;

The receiving unit is specifically configured to receive an identifier of a data stream that is discarded by the interference AP and sent by the controller.

With reference to the second or third possible implementation manner of the third aspect of the embodiment of the present invention, in the fourth possible implementation manner of the third aspect of the embodiment of the present invention, the quantity and the data flow used by the data When the sum of the number of data streams of the victim is greater than the number of antennas of the interfering AP, the identifier carries an identifier of the updated data stream used by the data;

The communication unit includes:

Obtaining a subunit, configured to obtain, by using an identifier of the updated data stream, a channel vector of the updated data stream;

a calculation subunit for calculating a direction vector orthogonal to a channel vector of the data stream used for each of the updated data, the number of the direction vectors being equal to the number of the sacrificed data streams;

And a communication subunit configured to communicate with the second ME using the victim data stream, the direction vector being used to multiply the signal transmitted by the victim data stream. A fourth aspect of the embodiments of the present invention discloses an AP, including a processor and a memory, wherein the memory stores a set of program codes, and the processor is configured to invoke the program code stored in the memory to perform the following operations:

When the interfering AP sends data to the first ME, the number of data streams used by the interfering AP carried by the data to send the data is obtained, where the interfering AP and the AP are in coverage of each other, and the The interfering AP communicates with the AP using the same channel;

Transmitting an interference cancellation request when the number of data streams used by the data is greater than or equal to the number of antennas of the AP;

Receiving an identifier of the data stream that the interference AP sacrifices;

And communicating with the second ME by using the data stream of the interference AP that is identified by the identifier. With reference to the fourth aspect of the embodiments of the present invention, in a first possible implementation manner of the fourth aspect of the embodiments of the present disclosure, when the processor acquires, by the The processor also acquires a channel matrix of the antenna of the interfering AP to the antenna of the AP when the number of data streams is.

With reference to the first possible implementation manner of the fourth aspect of the embodiments of the present invention, in a second possible implementation manner of the fourth aspect of the embodiments, the method for the processor to send the interference cancellation request is specifically:

Sending an interference cancellation request to the interfering AP, where the interference cancellation request carries the number of data streams that the AP expects the interference AP to sacrifice and the channel matrix, where the number of data streams that are expected to be sacrificed is less than or Equal to the number of antennas of the AP;

The manner in which the processor receives the identifier of the data stream that is caused by the interference AP is specifically: receiving, by the interference AP, an identifier of a data stream that is caused by the interference AP.

With reference to the first possible implementation manner of the fourth aspect of the embodiments of the present invention, in a third possible implementation manner of the fourth aspect of the embodiments, the method for the processor to send the interference cancellation request is specifically:

And sending, to the controller, an interference cancellation request, where the interference cancellation request carries the number of data flows that the AP expects the interference AP to sacrifice and the channel matrix, where the number of the data streams that are expected to be sacrificed is less than or equal to The number of antennas of the AP;

The method for receiving, by the processor, the identifier of the data stream that is the victim of the interference AP is specifically: receiving the identifier of the data stream that the interference AP sends by the controller.

With reference to the second or third possible implementation manner of the fourth aspect of the embodiments of the present invention, in the fourth possible implementation manner of the fourth aspect of the embodiments, the quantity and the data flow used by the data When the sum of the number of data streams of the victim is greater than the number of antennas of the interfering AP, the identifier carries an identifier of the updated data stream used by the data;

The manner in which the processor communicates with the second ME by using the data stream that the interference AP is identified by the identifier is specifically:

Obtaining, by the identifier of the data stream used by the updated data, a channel vector of the data stream used for the updated data;

Calculating a direction vector orthogonal to a channel vector of the data stream used for each updated data, the number of the direction vectors being equal to the number of the sacrificed data streams;

Communicating with the second ME using the victimized data stream, the direction vector being used to multiply the The signal transmitted by the victim data stream. A fifth aspect of the embodiments of the present invention discloses an interference cancellation method, including:

The first AP sends data to the first ME, where the data carries the number of data streams used by the first AP to send the data;

When the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the first AP receives the interference cancellation request, where the first AP and the second AP are in coverage of each other, and The first AP and the second AP use the same channel to communicate;

And acquiring, by the first AP, the data stream that is sacrificed by the first AP from the data flow of the first AP, in response to the interference cancellation request;

The first AP cancels interference of the victim data stream to the first AP, and the victim data stream is used by the second AP to communicate with a second ME.

With reference to the fifth aspect of the embodiments of the present invention, in a first possible implementation manner of the fifth aspect, the first AP receiving the interference cancellation request includes:

Receiving, by the first AP, an interference cancellation request sent by the second AP, where the interference cancellation request carries a channel matrix of an antenna of the first AP to an antenna of the second AP, and a second AP expectation The number of data streams that are sacrificed by the first AP, the number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the second AP.

With reference to the first possible implementation manner of the fifth aspect of the embodiments of the present invention, in a second possible implementation manner of the fifth aspect of the embodiments, the first AP responds to the interference cancellation request, Acquiring the data stream of the first AP to be sacrificed in the data flow of the first AP, including:

The first AP determines, according to the interference cancellation request, whether the number of data streams that are expected to be sacrificed is smaller than the number of antennas of the first AP, and if yes, the number of data streams that are sacrificed by the first AP is equal to the The number of data streams that are expected to be sacrificed;

The first AP selects a data stream that is sacrificed by the first AP from the data stream of the first AP by using the number of the sacrificed data streams.

With reference to the first possible implementation manner of the fifth aspect of the embodiments of the present invention, in a third possible implementation manner of the fifth aspect of the embodiments, the first AP responds to the interference cancellation request, Acquiring the data stream of the first AP to be sacrificed in the data flow of the first AP, including: The first AP determines, according to the interference cancellation request, whether the sum of the number of data streams expected to be sacrificed and the number of data streams used by the data is greater than the number of antennas of the first AP, and if so, the first The number of data streams sacrificed by an AP is equal to the difference between the number of antennas of the first AP and the number of data streams used by the data. If not, the number of data streams sacrificed by the first AP is equal to the expected sacrifice. The number of data streams;

With reference to the second or third possible implementation manner of the fifth aspect of the embodiments of the present invention, in a fourth possible implementation manner of the fifth aspect, After the interference of the first AP, the method further includes:

The first AP sends an identifier of the victim data stream to the second AP.

With reference to the fifth aspect of the embodiments of the present invention, in a fifth possible implementation manner of the fifth aspect, the first AP receiving the interference cancellation request includes:

The first AP receives an interference cancellation request sent by the controller, where the interference cancellation request carries a channel matrix of an antenna of the first AP to an antenna of the second AP, and the controller indicates the first AP The number of data streams that are sacrificed, the number of data streams indicating the sacrifice being determined by the controller based on the number of data streams that the second AP expects the first AP to sacrifice, the number of data streams that are expected to be sacrificed And being carried by the interference cancellation request sent by the second AP to the controller, where the number of desired data streams is less than or equal to the number of antennas of the second AP.

With reference to the fifth possible implementation manner of the fifth aspect of the embodiments of the present invention, in a sixth possible implementation manner of the fifth aspect, the first AP responds to the interference cancellation request, Acquiring the data stream of the first AP to be sacrificed in the data flow of the first AP, including:

The first AP responds to the interference cancellation request, and selects a data stream that is sacrificed by the first AP from the data stream of the first AP by using the number of data flows that indicate the sacrifice;

After the first AP cancels the interference of the victim data stream to the first AP, the method further includes:

The first AP sends an identifier of the victim data stream to the controller.

With reference to the fourth or the sixth possible implementation manner of the fifth aspect of the embodiments of the present invention, in a seventh possible implementation manner of the fifth aspect, And after the obtaining, by the data stream of the first AP, the data stream of the first AP, and the eliminating the interference of the victim data stream to the first AP, the method further includes:

When the sum of the number of data streams used by the data and the number of the sacrificed data streams is greater than the number of antennas of the first AP, the first AP updates the data stream used by the data.

With reference to the seventh possible implementation manner of the fifth aspect of the embodiments of the present invention, in an eighth possible implementation manner of the fifth aspect, The interference of the first AP includes:

Calculating, by the first AP, a channel vector of the victim data stream from the first AP to the second AP by using the channel matrix;

The first AP calculates a direction vector orthogonal to a channel vector of each of the victim data streams, the number of the direction vectors being equal to the number of updated data streams used for the data, the direction vector being used for multiplication A signal transmitted by the data stream used for the updated data. A sixth aspect of the embodiments of the present invention discloses an interference cancellation method, including:

When the first AP sends data to the first AP, the second AP acquires the number of data flows used by the first AP to send the data, where the first AP and the second AP are located. Covering each other, and the first AP and the second AP use the same channel to communicate;

And when the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the second AP sends an interference cancellation request;

Receiving, by the second AP, an identifier of the data stream that is sacrificed by the first AP;

The second AP communicates with the second ME by using the data stream that is saved by the first AP that is identified by the identifier.

With reference to the sixth aspect of the embodiments of the present invention, in a first possible implementation manner of the sixth aspect, the second AP acquires data used by the first AP that is sent by the data to send the data. The second AP also acquires a channel matrix of an antenna of the first AP to an antenna of the second AP.

With reference to the first possible implementation manner of the sixth aspect of the embodiments of the present invention, in a second possible implementation manner of the sixth aspect of the embodiments, the second AP sends an interference cancellation request, including: The second AP sends an interference cancellation request to the first AP, where the interference cancellation request carries The second AP expects the number of data streams that are sacrificed by the first AP and the channel matrix, where the number of the data streams that are expected to be sacrificed is less than or equal to the number of antennas of the second AP;

And receiving, by the second AP, an identifier of the data stream that is sacrificed by the first AP, including:

The second AP receives an identifier of the data stream that is saved by the first AP and sent by the first AP. With reference to the first possible implementation manner of the sixth aspect of the embodiments of the present invention, in a third possible implementation manner of the sixth aspect of the embodiments, the second AP sends an interference cancellation request, including: The second AP sends an interference cancellation request to the controller, where the interference cancellation request carries the number of data streams that the second AP expects the first AP to sacrifice and the channel matrix, where the data stream of the desired victim is expected The number is less than or equal to the number of antennas of the second AP;

The second AP receives an identifier of the data stream that is saved by the first AP and sent by the controller. With reference to the second or third possible implementation manner of the sixth aspect of the embodiment of the present invention, in the fourth possible implementation manner of the sixth aspect of the embodiment of the present invention, the quantity and the data flow used by the data When the sum of the number of the sacrificed data streams is greater than the number of antennas of the first AP, the identifier carries an identifier of the updated data stream used by the data;

The second AP communicates with the second ME by using the data stream that is saved by the first AP that is identified by the identifier, and includes:

And obtaining, by the second AP, a channel vector of the updated data stream used by the identifier of the data stream used by the updated data;

The second AP calculates a direction vector orthogonal to a channel vector of each updated data stream used by the data, the number of the direction vectors being equal to the number of the sacrificed data streams;

The second AP communicates with the second ME using the victim data stream, the direction vector being used to multiply the signal transmitted by the victim data stream.

In the embodiment of the present invention, when the first AP sends data to the first ME and the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the second AP sends an interference cancellation request to the first AP, and then the first Obtaining, by the AP, the data flow of the first AP from the data flow of the first AP, and canceling the interference of the victim data stream to the first AP, the second AP uses the data stream of the victim to communicate with the second ME, and therefore, save resources. 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 paying creative labor.

1 is a structural diagram of an AP according to an embodiment of the present invention;

2 is a view showing a positional relationship between a first AP and a second AP according to an embodiment of the present invention;

3 is a structural diagram of another AP disclosed in an embodiment of the present invention;

4 is a structural diagram of still another AP disclosed in the embodiment of the present invention;

FIG. 5 is a structural diagram of still another AP disclosed in the embodiment of the present invention; FIG.

6 is a flowchart of an interference cancellation method according to an embodiment of the present invention;

7 is a flowchart of another interference cancellation method according to an embodiment of the present invention;

FIG. 8 is a flowchart of still another interference cancellation method according to an embodiment of the present invention; FIG.

FIG. 9 is a flowchart of still another interference cancellation method according to an embodiment of the present invention. detailed description

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the invention discloses an interference cancellation method and device for saving resources. The following is a detailed description. Referring to FIG. 1, FIG. 1 is a structural diagram of an AP according to an embodiment of the present invention. As shown in FIG. 1, the AP 100 can include:

The sending unit 101 is configured to send data to the first ME, where the data carries the number of data streams used by the AP to send the data;

The receiving unit 102 is configured to: when the number of data streams used by the data is greater than or equal to the number of antennas of the interfered AP, receive an interference cancellation request, where the AP and the interfered AP are in coverage of each other, And the AP communicates with the interfered AP using the same channel;

The obtaining unit 103 is configured to obtain, according to the interference cancellation request, the data stream that the AP sacrifices from the data stream of the AP;

The eliminating unit 104 is configured to eliminate interference of the victim data stream to the AP, and the victim data stream is used by the interfered AP to communicate with the second ME.

In this embodiment, as shown in FIG. 2, when the first AP and the second AP are in coverage of each other, and the first AP and the second AP use the same channel to communicate with the MEs in the respective ranges, if An AP sends data to the first ME in the coverage of the first AP, and the second AP can detect the data sent by the first AP, so that the second AP cannot communicate with the ME in the coverage of the second AP. The first AP in FIG. 2 is the AP in the embodiment, and the second AP is the interfered AP in the embodiment. Therefore, when the sending unit 101 sends data to the first ME, the interfered AP will be triggered. The data obtains the number of data streams used by the AP to send the data and the identifier of the AP, and determines whether the number of data streams used by the AP to send the data is greater than or equal to the number of antennas of the interfered AP, and if yes, the interference is cancelled by the interfered AP. After the receiving unit 102 receives the interference cancellation request, the obtaining unit 103 acquires the data stream sacrificed by the AP from the data stream of the AP in response to the interference cancellation request, and the eliminating unit 104 cancels the interference of the victim data stream to the AP, so that the The victimized data stream is used by the interfered AP to communicate with the second ME without interfering with the AP's communication with the first ME.

As a possible implementation manner, the receiving unit 102 is specifically configured to receive an interference cancellation request sent by the interfered AP, where the interference cancellation request carries the channel matrix of the antenna of the AP to the antenna of the interfered AP and the AP that the interfered AP expects the AP to sacrifice. The number of data streams, the number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the interfered AP.

In this embodiment, when there is no controller to control the AP and the interfered AP, the interference cancellation request received by the receiving unit 102 is sent by the interfered AP, and the interference cancellation request carries the channel of the antenna of the AP to the antenna of the interfered AP. The number of data streams that the AP and the interfered AP expect the AP to sacrifice. Since the number of data streams that can be sent by one AP is less than or equal to the number of AP antennas, the number of data streams that the interfered AP expects the AP to sacrifice is less than or equal to The number of antennas of the interfered AP.

As a possible implementation manner, the obtaining unit 103 may include:

a first determining subunit, configured to determine, according to the interference cancellation request, whether the number of data streams that are expected to be sacrificed is smaller than the number of antennas of the AP, and if so, the number of data streams that the AP sacrifices is equal to the expected sacrifice The number of data streams;

The first selecting subunit is configured to select, by using the number of data streams of the sacrificial, the data stream sacrificed by the AP from the data stream of the AP.

In this embodiment, after the receiving unit 102 receives the interference cancellation request sent by the interfered AP, the first determining subunit responds to the interference cancellation request, and utilizes the number of data streams that the interfered AP expects the AP to sacrifice and the number of antennas of the AP. Determine the number of data streams that the AP is sacrificing. When the number of data streams that the interfered AP expects the AP to sacrifice is smaller than the number of antennas of the AP, the number of data streams sacrificed by the AP is equal to the number of data streams that the AP is expected to sacrifice by the interfered AP; since the number of antennas of the AP is greater than or equal to the interfered AP The number of antennas, so when the number of data streams that the AP is expected to sacrifice by the interfering AP is equal to the number of antennas of the AP, the number of data streams sacrificed by the AP is equal to the number of antennas of the AP minus one.

In this embodiment, after the first determining subunit determines the number of data streams sacrificed by the AP, the first selecting subunit selects the data stream sacrificed by the AP from the data stream of the AP by using the number of data streams sacrificed by the AP. When the first selected sub-unit selects the data stream sacrificed by the AP from the data stream of the AP, the data stream starting from the idle (ie, unsent data) is preferentially selected, so that the number of data streams sacrificed by the AP is less than or equal to the idle data. When the number of streams is used, the data stream used by the AP to send the data does not change.

As a possible implementation manner, the obtaining unit 103 may include:

a second determining subunit, configured to determine, according to the interference cancellation request, whether the sum of the number of data streams desirous of the sacrifice and the number of data streams used by the data is greater than the number of antennas of the AP, and if so, the number of data streams sacrificed by the AP is equal to The difference between the number of antennas of the AP and the number of data streams used by the data. If not, the number of data streams sacrificed by the AP is equal to the number of data streams that are expected to be sacrificed;

And a second selecting subunit, configured to select, by using the number of data streams of the sacrificial, the data stream sacrificed by the AP from the data stream of the AP.

In this embodiment, after the receiving unit 102 receives the interference cancellation request sent by the interfered AP, the second determining subunit uses the number of data streams that the AP is victimized by the interfered AP, the number of data streams used by the data, and the AP. The number of antennas determines the number of data streams that the AP sacrifices. When the sum of the number of data streams that the interfered AP expects the AP to sacrifice and the number of data streams used by the data is less than or equal to the number of antennas of the AP, the number of data streams sacrificed by the AP is equal to the number of data streams that the AP is expected to sacrifice by the interfered AP. When the sum of the number of data streams that the interfering AP expects the AP to sacrifice and the number of data streams used by the data is greater than the number of antennas of the AP, the number of data streams sacrificed by the AP is equal to the number of antennas of the AP and the number of data used by the AP. The difference between the number of streams.

As a possible implementation, the sending unit 101 is further configured to send the identifier of the victim data stream to the interfered AP.

Specifically, the sending unit 101 is further configured to send, to the interfered AP, an identifier of the data stream of the sacrificial acquired by the acquiring unit 103.

In this embodiment, after the cancellation unit 104 cancels the interference of the victim data stream to the AP, the sending unit 101 sends the identifier of the victim data stream to the interfered AP, to trigger the victim AP to use the identifier identified by the identifier. The data stream communicates with the second ME.

As a possible implementation, the receiving unit 102 is specifically configured to receive an interference cancellation request sent by the controller, where the interference cancellation request carries a channel matrix of an antenna of the AP to an antenna of the interfered AP, and a controller indicates a data stream that is sacrificed by the AP. The number, the number of data streams that are indicated to be sacrificed is determined by the controller based on the number of data streams that the victim AP desires to sacrifice the AP, and the number of data streams desirous of being sacrificed is carried by the interference cancellation request sent by the interfered AP to the controller. The number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the interfered AP.

In this embodiment, when there is a controller controlling the AP and the interfered AP, the interference cancellation request received by the receiving unit 102 is sent by the controller, and the interference cancellation request carries the channel matrix of the antenna of the AP to the antenna of the interfered AP. And the controller indicates the number of data streams that the AP is sacrificing. The number of data streams indicating the sacrifice is determined by the controller based on the number of data streams that the AP is sacrificed by the interfering AP, and the number of data streams desirous of being sacrificed is carried by the interference cancellation request sent by the interfered AP to the controller. The number of data streams that the AP can transmit at most is less than or equal to the number of AP antennas. Therefore, the number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the interfered AP.

As a possible implementation, the obtaining unit 103 is specifically configured to: in response to the interference cancellation request, select the data stream that the AP sacrifices from the data stream of the AP by using the number of data streams that are indicated by the indication;

The sending unit 101 is further configured to send an identifier of the victim data stream to the controller.

Specifically, the sending unit 101 is further configured to send, to the interfered AP, an identifier of the victim data stream acquired by the acquiring unit 103.

In this embodiment, the obtaining unit 103 selects the interference cancellation request sent by the controller, and selects the data stream sacrificed by the AP from the data stream of the AP by using the number of data streams sacrificed by the AP. When the AP-saved data stream is selected from the data stream of the AP, the data stream is preferentially selected from the idle data stream, so that the AP is selected. When the number of data streams that are sacrificed is less than or equal to the number of idle data streams, the data stream used by the AP to send the data does not change.

In this embodiment, after the eliminating unit 104 cancels the interference of the victim data stream to the AP, the sending unit 101 sends the identifier of the victim data stream to the controller to trigger the controller to identify the victim data stream and the The number of sacrificed data streams is sent to the interfered AP to trigger the interfered AP to communicate with the second ME using the victimized data stream identified by the identity.

As a possible implementation manner, as shown in FIG. 1, the AP 100 may further include:

The updating unit 105 is configured to update the data stream used by the data when the sum of the number of data streams used by the data and the number of the sacrificed data streams is greater than the number of antennas of the AP.

In this embodiment, after the obtaining unit 103 obtains the data stream sacrificed by the AP from the data stream of the AP in response to the interference cancellation request, the updating unit 105 determines whether the sum of the number of data streams used by the data and the number of the sacrificed data streams is If the sum of the number of data streams used by the data and the number of the sacrificed data streams is greater than the number of antennas of the AP, the number of data streams sacrificed by the AP and the number of antennas of the AP are used to update the data stream used by the data. And the sum of the number of data streams used by the updated data and the number of the sacrificed data streams is less than or equal to the number of antennas of the AP, when the sum of the number of data streams used by the data and the number of the sacrificed data streams is less than or When the number of antennas equal to the AP is equal, the data stream used for the data will not be updated.

As a possible implementation, the eliminating unit 104 may include: a first calculating subunit 1041, configured to calculate, by using a channel matrix, a channel vector of the victim data stream from the AP to the interfered AP;

a second calculation subunit 1042, configured to calculate a direction vector orthogonal to a channel vector of each of the victim data streams, the number of the direction vectors being equal to the updated number of data streams used by the data, the direction vector being used for multiplication The signal transmitted by the data stream used to update the data.

In this embodiment, when the data stream used for the data is not updated, the number of direction vectors is equal to the number of data streams used by the data, and the direction vector is used to multiply the signal when the data stream used for the data is transmitted or received. When the data stream used for the data is updated, the number of direction vectors is equal to the number of data streams used for the updated data, and the direction vector is used to multiply the signal when the updated data stream is used to transmit or receive signals. It can avoid interference to the AP if the interfered AP communicates with the second ME.

As a possible implementation manner, the sending unit 101 is further configured to: when the number of data streams used by the AP to send current data changes with respect to the updated number of data streams used by the data, The AP sends a victim data stream update request;

The receiving unit 102 is further configured to receive the number of data streams that are saved by the updated AP sent by the interfering AP. The acquiring unit 103 is further configured to obtain the updated AP from the data stream of the AP by using the number of data streams that the updated AP sacrifices. Sacrificed data stream;

The eliminating unit 104 is further configured to: cancel the interference of the data stream that the updated AP sacrifices on the AP;

The sending unit 101 is further configured to send, to the interfered AP, an identifier of the data stream that the updated AP sacrifices. In this embodiment, if the controller does not control the AP and the interfered AP, the canceling unit 104 removes the interference of the victim data stream to the AP, and the data sent by the AP changes, and the number of data streams used by the AP to send the current data. When the number of data streams used for the updated data changes, the transmitting unit 101 sends a victim data stream update request to the interfered AP, requesting the interfered AP to update the number of data streams sacrificed by the AP, and then the receiving unit 102 receives the interfered. The number of data streams that the AP transmits at the updated AP, the acquiring unit 103 acquires the updated AP-saved data stream from the data stream of the AP by using the number of data streams that the updated AP sacrifices, and the eliminating unit 104 eliminates the updated AP-sacrificed data. The interference of the data stream to the AP, the sending unit 101 sends the identifier of the data stream sacrificed by the updated AP to the interfered AP, so that the interfered AP communicates with the ME in the range of the interfered AP by using the data stream sacrificed by the updated AP.

As a possible implementation, the sending unit 101 is further configured to: when the number of data streams used by the AP to send current data changes with respect to the updated number of data streams used by the data, send a sacrificial data stream update request to the controller;

The receiving unit 102 is further configured to receive, by the controller, the number of data streams that are saved by the updated AP, and the acquiring unit 103 is further configured to obtain the updated AP sacrifice from the data stream of the AP by using the number of data streams that the updated AP sacrifices. Data flow

The sending unit 101 is further configured to send, to the controller, an identifier of the data stream that the updated AP sacrifices, to trigger the controller to send the identifier of the data stream that the updated AP sacrifices to the interfered AP.

In this embodiment, if the controller controls the AP and the interfered AP, the canceling unit 104 removes the interference of the victim data stream to the AP, and the data sent by the AP changes, and the number of data streams used by the AP to send the current data. When the number of data streams used for the updated data changes, the sending unit 101 sends a sacrificial data stream update request to the controller, and then the receiving unit 102 receives the number of data streams sacrificed by the updated AP sent by the controller, and acquires the unit. 103 using the updated AP to sacrifice the data stream The quantity obtains the updated AP-saved data stream from the data stream of the AP, the eliminating unit 104 eliminates the interference of the updated AP-saved data stream to the AP, and the sending unit 101 sends the identifier of the updated AP-saved data stream to the controller, to The trigger controller sends an identifier of the data stream sacrificed by the updated AP to the interfered AP, so that the interfered AP communicates with the ME in the range of the interfered AP by using the data stream sacrificed by the updated AP.

In the AP described in FIG. 1, when the AP sends data to the first ME and the number of data streams used by the data is greater than or equal to the number of antennas of the interfered AP, the AP will receive the interference cancellation request sent by the interfered AP, and then The AP obtains the data stream sacrificed by the AP from the data stream of the AP and eliminates the interference of the victim data stream to the AP. The victim data stream is used by the interfered AP to communicate with the second ME, and thus, resources can be saved. Referring to FIG. 3, FIG. 3 is a structural diagram of another AP according to an embodiment of the present invention. As shown in FIG. 3, the AP 300 can include a processor 301 and a memory 302. The memory 302 stores a set of program codes, and the processor 301 is configured to call the program code stored in the memory 302 to perform the following operations:

Sending data to the first ME, where the data carries the number of data streams used by the AP to send the data; when the number of data streams used by the data is greater than or equal to the number of antennas of the interfered AP, receiving an interference cancellation request, where the AP and the The interfering APs are in coverage of each other, and the AP communicates with the interfered AP using the same channel;

Responding to the interference cancellation request, acquiring the data stream sacrificed by the AP from the data stream of the AP;

The interference of the victim data stream to the AP is eliminated, and the victim data stream is used by the interfered AP to communicate with the second ME.

As a possible implementation, the manner in which the processor 301 receives the interference cancellation request is specifically: receiving an interference cancellation request sent by the interfered AP, where the interference cancellation request carries a channel matrix of the antenna of the AP to the antenna of the interfered AP, and is The number of data streams that the interfering AP expects the AP to sacrifice, the number of desired data streams being less than or equal to the number of antennas of the interfered AP.

As a possible implementation manner, the processor 301, in response to the interference cancellation request, obtains the data stream that the AP sacrifices from the data stream of the AP, specifically:

Responding to the interference cancellation request, determining whether the number of data streams that are expected to be sacrificed is smaller than the number of antennas of the AP, and if so, the number of data streams that the AP sacrifices is equal to the number of data streams that are expected to be sacrificed; The number of data streams that are sacrificed is used to select the data stream sacrificed by the AP from the data stream of the AP.

Responding to the interference cancellation request, determining whether the sum of the number of data streams expected to be sacrificed and the number of data streams used by the data is greater than the number of antennas of the AP, and if so, the number of data streams sacrificed by the AP is equal to the number of antennas of the AP and the data used. The difference between the number of data streams, if not, the number of data streams sacrificed by the AP is equal to the number of data streams that are expected to be sacrificed;

The number of data streams of the victim is used to select the data stream sacrificed by the AP from the data stream of the AP.

As a possible implementation manner, after the processor 301 cancels the interference of the victim data stream to the AP, the processor 301 is further configured to invoke the program code stored in the memory 302 to perform the following operations:

The identifier of the victimized data stream is sent to the interfered AP.

As a possible implementation, the manner in which the processor 301 receives the interference cancellation request is specifically: receiving an interference cancellation request sent by the controller, where the interference cancellation request carries a channel matrix and a controller of the antenna of the AP to the antenna of the interfered AP Determining the number of data streams sacrificed by the AP, the number of data streams indicating the sacrifice is determined by the controller based on the number of data streams that the AP is expected to sacrifice, and the number of data streams desirous of being sacrificed is sent to the control by the interfered AP. The interference cancellation request carried by the device, the number of data streams desirous of being sacrificed is less than or equal to the number of antennas of the interfered AP.

Responding to the interference cancellation request, using the number of data streams sacrificed by the indication to select the data stream sacrificed by the AP from the data stream of the AP;

After the processor 301 eliminates the interference of the victim data stream to the AP, it also uses the program code stored in the memory 302 to perform the following operations:

The identifier of the victim data stream is sent to the controller.

As a possible implementation manner, the processor 301 is configured to respond to the interference cancellation request, after acquiring the data stream sacrificed by the AP from the data stream of the AP, and before canceling the interference of the victim data stream to the AP, and also used to call the memory 302. The program code does the following:

When the sum of the number of data streams used by the data and the number of the sacrificed data streams is greater than the number of antennas of the AP, the data stream used for the data is updated. As a possible implementation manner, the manner in which the processor 301 cancels the interference of the victim data stream to the AP is specifically:

Calculating, by the channel matrix, a channel vector of the victim data stream from the AP to the interfered AP; calculating a direction vector orthogonal to a channel vector of each of the victim data streams, the number of the direction vectors being equal to the updated data The number of data streams used to multiply the signals transmitted by the updated data stream for that data.

As a possible implementation manner, the processor 301 is further configured to call the program code stored in the memory 302 to perform the following operations:

Sending a victim data stream update request to the interfered AP when the number of data streams used by the AP to transmit the current data changes relative to the updated number of data streams used by the data;

Receiving the number of data streams sacrificed by the updated AP sent by the interfering AP;

Obtaining the updated AP-saved data stream from the data stream of the AP by using the number of data streams sacrificed by the updated AP;

Eliminating interference from the AP's sacrificed data stream to the AP;

The identifier of the data stream that the updated AP sacrifices to the interfered AP.

Sending a sacrificial data stream update request to the controller when the number of data streams used by the AP to transmit the current data changes relative to the updated number of data streams used by the data;

Receiving the number of data streams sacrificed by the updated AP sent by the controller;

Eliminating interference from the AP's sacrificed data stream to the AP;

Sending an identifier of the updated AP-saved data stream to the controller to trigger the controller to send the identifier of the data stream sacrificed by the updated AP to the interfered AP.

In the AP described in FIG. 3, when the AP sends data to the first ME and the number of data streams used by the data is greater than or equal to the number of antennas of the interfered AP, the AP will receive the interference cancellation request sent by the interfered AP, and then the AP Acquiring the data stream sacrificed by the AP from the data stream of the AP and eliminating the interference of the victim data stream to the AP, the victim data stream being used by the interfered AP to communicate with the second ME, therefore, the section can be Please refer to FIG. 4. FIG. 4 is a structural diagram of still another AP disclosed in the embodiment of the present invention. As shown in FIG. 4, the AP 400 can include:

The acquiring unit 401, when the interfering AP sends data to the first ME, acquires the number of data streams used by the interfering AP carried by the data to send the data, where the interfering AP and the AP are in coverage of each other, and the interfering AP and the AP use the same Channel communication;

The sending unit 402 is configured to send an interference cancellation request when the number of data streams used by the data is greater than or equal to the number of antennas of the AP;

The receiving unit 403 is configured to receive an identifier of the data stream that interferes with the AP victim;

The communication unit 404 is configured to communicate with the second ME by using a data stream that is identified by the interference AP identified by the identifier.

In this embodiment, as shown in FIG. 2, when the first AP and the second AP are in coverage of each other, and the first AP and the second AP use the same channel to communicate with the MEs in the respective ranges, if An AP sends data to the first ME in the coverage of the first AP, and the second AP can detect the data sent by the first AP, so that the second AP cannot communicate with the ME in the coverage of the second AP. The first AP in FIG. 2 is the interfering AP in the embodiment, and the second AP is the AP in the embodiment. When the interfering AP sends data to the first ME in the range of the interfering AP, the acquiring unit 401 acquires the AP. The number of data streams used by the interfering APs that the data carries the data. When the number of data streams used by the acquiring unit 401 is greater than or equal to the number of antennas of the AP, the data stream of the AP is occupied by the data sent by the interfering AP. So that the AP eliminates the interference of the data to the AP and then communicates the idle data stream with the ME in its range. Therefore, the sending unit 402 sends an interference cancellation request, and then the receiving unit 403 receives the identifier of the data stream that the victim AP is victimized. The communication unit 404 communicates with the second ME within the AP range using the data stream sacrificed by the interfering AP identified by the identity.

As a possible implementation manner, the obtaining unit 401 is further configured to acquire a channel matrix of an antenna of the AP that interferes with the AP to the AP.

In this embodiment, when the AP and the interfering AP transmit data, one of the data streams used in the data may use one antenna or multiple antennas. Therefore, in order to eliminate the communication with the MEs in the coverage range of each other, When interfering with each other, it is necessary to calculate the channel of each data stream in which data is transmitted. Vector. Therefore, when the obtaining unit 401 acquires the number of data streams used by the interfering AP carried by the data to transmit the data, the channel matrix of the antenna of the interfering AP to the AP is also acquired.

As a possible implementation, the sending unit 402 is specifically configured to send, to the interfering AP, an interference cancellation request, where the interference cancellation request carries the number of data flows that the AP expects to interfere with the AP and the channel matrix, where the expected data is sacrificed. The number of streams is less than or equal to the number of antennas of the AP;

The receiving unit 403 is specifically configured to receive an identifier of a data stream that is interfered by the AP transmitted by the interfering AP. In this embodiment, when there is no controller to control the AP and the interfering AP, the sending unit 402 directly sends the interference cancellation request to the interfering AP, and the receiving unit 403 directly receives the identifier of the data stream that the interfering AP transmits by the interfering AP, where The interference cancellation request carries the number of data flows that the AP expects to interfere with the AP victim and the channel matrix. Since the number of data streams that an AP can transmit at most is less than or equal to the number of the AP antennas, the number of data streams that are expected to be sacrificed Less than or equal to the number of antennas of the AP.

As a possible implementation, the sending unit 402 is specifically configured to send, to the controller, an interference cancellation request, where the interference cancellation request carries the number of data flows that the AP expects to interfere with the AP and the channel matrix, where the expected data is sacrificed. The number of streams is less than or equal to the number of antennas of the AP;

The receiving unit 403 is specifically configured to receive, by the controller, an identifier of the data stream that is interfered by the AP. In this embodiment, when there is a controller controlling the AP and the interfering AP, the sending unit 402 sends an interference cancellation request to the controller, to trigger the controller to determine the number of data streams sacrificed by the AP by using the number of the sacrificed data streams. The controller sends the interference cancellation request to the interference AP, where the interference cancellation request carries the channel matrix and the controller indicates the number of data streams that the AP sacrifices, and the receiving unit 403 receives the identifier of the data stream that the interference AP transmits by the controller.

As a possible implementation manner, when the sum of the number of data streams used by the data and the number of the victimized data streams is greater than the number of antennas of the interfering AP, the identifier carries an identifier of the updated data stream used by the data;

Communication unit 404 can include:

The obtaining subunit 4041 is configured to obtain, by using the updated identifier of the data stream used by the data, a channel vector of the updated data stream used by the data;

a calculation subunit 4042, configured to calculate a direction vector orthogonal to a channel vector of each updated data stream used by the data, the number of the direction vectors being equal to the number of the sacrificed data streams;

a communication subunit 4043, configured to communicate with the second ME by using the victim data stream, the direction The vector is used to multiply the signal transmitted by the victim's data stream.

Correspondingly, when the sum of the number of data streams used by the data and the number of the victim data streams is less than or equal to the number of antennas of the interfering AP, the identifier carries the identity of the data stream used for the data.

In this embodiment, after the receiving unit 403 receives the identifier of the data stream that is interfered by the AP transmitted by the interfering AP, the AP will cancel the interference of the data to the data stream that the victim AP is victimized. Therefore, the obtaining subunit 4041 receives the data stream by using the receiving unit 403. The identifier of the data stream used for updating the data carried by the identifier acquires the channel vector of the data stream used for the updated data, and the calculation subunit 4042 calculates the channel vector of the data stream used for the updated data acquired by the acquisition subunit. The direction vector, communication sub-unit 4043 communicates with the second ME using the victim's data stream identified by the identifier received by the receiving unit 403, the direction vector being used to multiply the signal transmitted by the victim data stream. The channel vector may be carried by the identifier of the data stream that is calculated by the interfering AP and is discarded by the interfering AP sent to the AP, or may be calculated by the acquiring subunit 4041 using the identifier of the data stream used for the updated data and the channel matrix. This embodiment is not limited.

As a possible implementation manner, the AP 400 may further include:

The receiving unit 403 is further configured to receive a victim data stream update request sent by the interfering AP;

And an updating unit, configured to update the number of data streams that are interfered with by the AP in response to the sacrificing data stream update request;

The sending unit 402 is further configured to send, to the interfering AP, the number of data streams that are updated by the interfering AP, and the receiving unit 403 is further configured to receive, by the receiving unit, the identifier of the data stream that is interfered by the updated interfering AP sent by the AP;

The communication unit 404 is further configured to communicate with the third ME by using the data stream sacrificed by the updated interference AP.

As a possible implementation manner, the receiving unit 403 is further configured to receive, by the controller, an identifier of the updated data stream of the victim AP.

In the AP described in FIG. 4, when the interfering AP sends data to the first ME and the number of data streams used by the data is greater than or equal to the number of antennas of the AP, the AP sends an interference cancellation request to the interfering AP, and then receives the interfering AP transmission. Interfering with the identity of the data stream that the AP sacrifices, and using the interference AP identified by the identifier The sacrificed data stream communicates with the second ME, thus saving resources. Please refer to FIG. 5. FIG. 5 is a structural diagram of still another AP disclosed in the embodiment of the present invention. As shown in FIG. 5, the AP 500 can include a processor 501 and a memory 502. The memory 502 stores a set of program codes, and the processor 501 is configured to call the program code stored in the memory 502 to perform the following operations:

When the interfering AP sends data to the first ME, the number of data streams used by the interfering AP carried by the data to send the data is obtained, where the interfering AP and the AP are in coverage of each other, and the interfering AP and the AP use the same channel to communicate;

Sending an interference cancellation request when the number of data streams used by the data is greater than or equal to the number of antennas of the AP;

Receiving an identifier of a data stream that interferes with the AP's sacrifice;

The data stream sacrificed by the interference AP identified by the identifier is used to communicate with the second ME.

As a possible implementation manner, when the processor 501 acquires the number of data streams used by the interfering AP carried by the data to send the data, the processor 501 further acquires a channel matrix of an antenna of the interfering AP to the antenna of the AP.

As a possible implementation, the method for the processor 501 to send the interference cancellation request is specifically: sending an interference cancellation request to the interfering AP, where the interference cancellation request carries the number of data streams that the AP expects to interfere with the AP to sacrifice and the channel matrix, where The number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the AP;

The manner in which the processor 501 receives the identifier of the data stream that interferes with the sacrifice of the AP is specifically:

Receives the identity of the data stream that the interfering AP sends.

As a possible implementation, the method for the processor 501 to send the interference cancellation request is specifically: sending an interference cancellation request to the controller, where the interference cancellation request carries the number of data streams that the AP expects to interfere with the AP victim and the channel matrix, where The number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the AP;

The identifier of the data stream that the receiving AP sends to the interference AP.

As a possible implementation manner, when the sum of the number of data streams used by the data and the number of the victimized data streams is greater than the number of antennas of the interfering AP, the identifier carries updated data for the data. The identity of the stream;

The manner in which the processor 501 communicates with the second ME by using the data stream that is interfered by the interference AP identified by the identifier is specifically:

Obtaining, by the identifier of the updated data stream, the channel vector of the updated data stream used by the data;

Calculating a direction vector orthogonal to a channel vector of each updated data stream used for the data, the number of the vector vectors being equal to the number of the sacrificed data streams;

The victim data stream is used to communicate with a second ME that is used to multiply the signal transmitted by the victim data stream.

As a possible implementation, the processor 501 is further configured to call the program code stored in the memory 502 to perform the following operations:

Receiving a victim data stream update request sent by the interference AP;

Responding to the sacrificing data stream update request, updating the number of data streams that the victim AP sacrifices;

The number of data streams sacrificed by the interfering AP sent to the interfering AP;

Receiving an identifier of the data stream sacrificed by the updated interference AP sent by the AP;

The data stream sacrificed by the updated interfering AP is communicated with the third ME.

Receiving an identifier of the data stream sacrificed by the updated interference AP sent by the controller;

In the AP described in FIG. 5, when the interfering AP sends data to the first ME and the number of data streams used by the data is greater than or equal to the number of antennas of the AP, the AP sends an interference cancellation request to the interfering AP, and then receives the interfering AP transmission. Intersecting the identifier of the data stream that the AP sacrifices, and communicating with the second ME by using the data stream sacrificed by the interference AP identified by the identifier, thereby saving resources. Please refer to FIG. 6. FIG. 6 is a flowchart of an interference cancellation method according to an embodiment of the present invention. The interference cancellation method shown in FIG. 6 is described from the perspective of the first AP. As shown in Figure 6, the interference cancellation method can include the following steps.

S601: The first AP sends data to the first ME, where the data carries the number used by the first AP to send data. According to the number of streams.

In this embodiment, the first ME is currently in the coverage of the first AP, where the first AP is the AP in the first embodiment and the second embodiment, and the interfering AP in the third embodiment and the fourth embodiment. The second AP is the AP in the first embodiment and the second embodiment, the third embodiment, and the AP in the fourth embodiment.

S602, when the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the first AP receives the interference cancellation request, where the first AP and the second AP are in coverage of each other, and the first AP and the first AP The two APs use the same channel for communication.

In this embodiment, as shown in FIG. 2, when the first AP and the second AP are in coverage of each other, and the first AP and the second AP use the same channel to communicate with the MEs in the respective ranges, if An AP sends data to the first ME in the coverage of the first AP, and the second AP can detect the data sent by the second AP, so that the second AP cannot communicate with the ME in the coverage of the second AP. Therefore, when the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the first AP will receive the interference cancellation request sent by the second AP.

As a possible implementation manner, the step of the first AP receiving the interference cancellation request is specifically: the first AP receives an interference cancellation request sent by the second AP, where the interference cancellation request carries the antenna of the first AP to the second AP. The channel matrix of the antenna and the number of data streams that the second AP expects the first AP to sacrifice, the number of desired data streams being less than or equal to the number of antennas of the second AP.

In this embodiment, when the controller does not control the first AP and the second AP, the interference cancellation request received by the first AP is directly sent by the second AP, where the interference cancellation request carries the antenna of the first AP to the second The channel matrix of the antenna of the AP and the number of data streams that the second AP expects the first AP to sacrifice. Since the number of data streams that an AP can transmit at most is less than or equal to the number of the AP antennas, the second AP expects the first AP. The number of sacrificed data streams is less than or equal to the number of antennas of the second AP.

As a possible implementation manner, the step of the first AP receiving the interference cancellation request is specifically: the first AP receives an interference cancellation request sent by the controller, where the interference cancellation request carries an antenna of the first AP to an antenna of the second AP. The channel matrix and the controller indicate the number of data streams sacrificed by the first AP, the number of data streams that are sacrificed by the controller is determined by the controller based on the number of data streams that the second AP expects the first AP to sacrifice, the desired sacrificed data stream The number of the data is carried by the interference cancellation request sent by the second AP to the controller, and the number of the data stream desirous of being sacrificed is less than or equal to the number of antennas of the second AP. In this embodiment, when the controller controls the first AP and the second AP, the interference cancellation request received by the first AP is sent by the controller, where the interference cancellation request carries the antenna of the first AP to the second AP. The channel matrix of the antenna and the controller indicate the number of data streams sacrificed by the first AP. The number of data streams indicating the sacrifice is determined by the controller based on the number of data streams that the second AP expects the first AP to sacrifice, and the number of the data streams desirous of being sacrificed is an interference cancellation request sent by the second AP to the controller. The number of data streams that can be sent by one AP is less than or equal to the number of AP antennas. Therefore, the number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the second AP.

S603. The first AP responds to the interference cancellation request, and obtains the data stream that is sacrificed by the first AP from the data flow of the first AP.

As a possible implementation manner, the first AP, in response to the interference cancellation request, acquiring the data stream that is sacrificed by the first AP from the data flow of the first AP may include the following steps:

The first AP responds to the interference cancellation request, and determines whether the number of data streams that are expected to be sacrificed is smaller than the number of antennas of the first AP, and if so, the number of data streams that the first AP sacrifices is equal to the number of data streams that are expected to be sacrificed;

The first AP selects the data stream of the first AP from the data stream of the first AP by using the number of the sacrificed data streams.

The first AP responds to the interference cancellation request, and determines whether the sum of the number of data streams expected to be sacrificed and the number of data streams used by the data is greater than the number of antennas of the first AP, and if so, the number of data streams sacrificed by the first AP is equal to The difference between the number of antennas of an AP and the number of data streams used by the data. If not, the number of data streams sacrificed by the first AP is equal to the number of data streams that are expected to be sacrificed;

In this embodiment, when the controller does not control the first AP and the second AP, after the first AP receives the interference cancellation request sent by the second AP, the first AP determines the number of data streams that the first AP sacrifices, and then The data stream of the first AP is selected from the data stream of the first AP by using the number of the sacrificed data streams.

As a possible implementation manner, the first AP responds to the interference cancellation request, and the step of acquiring the data flow of the first AP victim from the data flow of the first AP is specifically: The first AP responds to the interference cancellation request, and selects the data stream sacrificed by the first AP from the data stream of the first AP by using the number of data streams sacrificed by the indication.

In this embodiment, when the controller controls the first AP and the second AP, after the first AP receives the interference cancellation request sent by the second AP, the first AP uses the controller to indicate the data flow of the first AP to be sacrificed. The number selects the data stream sacrificed by the first AP from the data stream of the first AP.

In this embodiment, the controller and the first AP determine the number of data streams that are sacrificed by the first AP in two ways, one is based on the number of data streams that the second AP expects the first AP to sacrifice, and the other is The number of data streams idle by the first AP is a reference. The manner in which the second AP expects the number of data streams sacrificed by the first AP as a reference: when the second AP expects that the number of data streams sacrificed by the first AP is smaller than the number of antennas of the first AP, the data flow of the first AP is sacrificed The number is equal to the number of data streams that the second AP expects the first AP to sacrifice; since the number of antennas of the first AP is greater than or equal to the number of antennas of the second AP, when the second AP expects the number of data streams sacrificed by the first AP to be equal to the number When the number of antennas of an AP is equal, the number of data streams sacrificed by the first AP is equal to the number of antennas of the first AP minus one. Referring to the number of data streams that are idle by the first AP: when the second AP expects that the sum of the number of data streams sacrificed by the first AP and the number of data streams used by the data is less than or equal to the number of antennas of the first AP, The number of data streams sacrificed by the first AP is equal to the number of data streams that the second AP expects the first AP to sacrifice; when the second AP expects the sum of the number of data streams sacrificed by the first AP and the number of data streams used by the data is greater than When the number of antennas of an AP is equal, the number of data streams sacrificed by the first AP is equal to the difference between the number of antennas of the first AP and the number of data streams used by the data.

As a possible implementation manner, after the first AP obtains the data stream that is sacrificed by the first AP from the data flow of the first AP, the interference cancellation method may further include:

In this embodiment, after the first AP obtains the data stream that is sacrificed by the first AP from the data stream of the first AP, the first AP determines the sum of the number of data streams used by the data and the number of the sacrificed data streams. Whether the number of antennas of the first AP is larger than the number of antennas used by the first AP, and the data stream of the first AP and the antenna of the first AP are used when the sum of the number of data streams used by the data is greater than the number of antennas of the first AP. The quantity updates the data stream used by the data. When the sum of the number of data streams used by the data and the number of the sacrificed data streams is less than or equal to the number of antennas of the first AP, the data stream used for the data is not updated. S604. The first AP cancels interference of the victim data stream to the first AP, where the victim data stream is used by the second AP to communicate with the second ME.

As a possible implementation manner, the first AP canceling the interference of the victim data stream to the first AP may include the following steps:

Calculating a channel vector of the victim data stream from the first AP to the second AP by using a channel matrix; calculating a direction vector orthogonal to a channel vector of each of the victim data streams, the number of the direction vectors being equal to the updated one The number of data streams used by the data, which is used to multiply the signals transmitted by the updated data stream for that data.

In this embodiment, when the data stream used for the data is not updated, the number of direction vectors is equal to the number of data streams used by the data, and the direction vector is used to multiply the signal when the data stream used for the data is transmitted or received. When the data stream used for the data is updated, the number of direction vectors is equal to the number of data streams used for the updated data, and the direction vector is used to multiply the signal when the updated data stream is used to transmit or receive signals. It is possible to avoid interference to the AP if the second AP communicates with the second ME.

As a possible implementation manner, the interference cancellation method may further include the following steps.

The first AP sends the identifier of the victim data stream to the second AP.

When the number of data streams used by the first AP to send current data changes relative to the number of updated data streams used by the data, the first AP sends a victim data stream update request to the second AP;

Receiving, by the first AP, the number of updated first AP-saved data streams sent by the second AP; the first AP acquiring the updated first AP from the data stream of the first AP by using the updated first AP-saved data stream Sacrificed data stream;

The first AP cancels the interference of the updated first AP victim data stream to the first AP;

The first AP sends an identifier of the updated data stream of the first AP to the second AP.

In this embodiment, if the controller does not control the first AP and the second AP, after the first AP cancels the interference of the victim data stream to the first AP, the first AP sends the victim data stream to the second AP. The identifier of the data stream carrying the sacrifice. When the data sent by the first AP changes, and the number of data streams used by the current data changes with respect to the updated number of data streams used by the data, the first AP sends a sacrifice data stream update request to the second AP, requesting The second AP updates the number of data streams that are sacrificed by the first AP, and then receives the updated data stream of the first AP that is sent by the second AP, and uses the updated data of the first AP to sacrifice data from the first AP. Get updates in the stream The first AP sacrifices the data stream, eliminates the interference of the updated first AP-saved data stream to the first AP, and sends the updated first AP-saved data stream identifier to the second AP, so that the second AP utilizes the update. The first AP-saved data stream communicates with the ME in the second AP range.

As a possible implementation manner, the interference cancellation method may include the following steps:

The first AP sends the identifier of the victim data stream to the controller.

The first AP sends a sacrificial data stream update request to the controller when the number of data streams used by the first AP to transmit the current data changes relative to the updated number of data streams used by the data;

Receiving, by the first AP, the updated data stream of the first AP that is sent by the controller;

The first AP obtains the updated data stream of the first AP victim from the data stream of the first AP by using the updated number of data streams sacrificed by the first AP;

The first AP sends an identifier of the updated first AP victim data stream to the controller, to trigger the controller to send the identifier of the updated first AP sacrificed data stream to the second AP.

In this embodiment, if the controller controls the first AP and the second AP, and after the first AP cancels the interference of the victim data stream to the first AP, the first AP sends the identifier of the victim data stream to the controller. . When the data sent by the first AP changes, and the number of data streams used by the current data changes relative to the updated number of data streams used by the data, the first AP sends a victim data stream update request to the controller, and then receives the control. The number of data streams sacrificed by the updated first AP sent by the device, and the updated data stream of the first AP victim is obtained from the data stream of the first AP by using the updated number of data streams sacrificed by the first AP, and the updated data is removed. An AP victimized data stream interferes with the first AP, and sends an identifier of the updated first AP-saved data stream to the controller, to trigger the controller to send the updated first AP-saved data stream identifier to the second AP. So that the second AP communicates with the ME in the range of the second AP by using the updated first AP-saved data stream.

In the interference cancellation method described in FIG. 6, when the first AP sends data to the first ME and the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the first AP will receive the second AP. After the interference cancellation request, the first AP acquires the data stream of the first AP from the data stream of the first AP and eliminates the interference of the victim data stream to the first AP, where the victim data stream is used by the second AP. The second ME communicates, so resources can be saved. Please refer to FIG. 7. FIG. 7 is a flowchart of another interference cancellation method according to an embodiment of the present invention. The interference cancellation method shown in FIG. 7 is described from the perspective of the second AP. As shown in FIG. 7, the interference cancellation method may include the following steps.

S70: When the first AP sends data to the first ME, the second AP acquires the number of data flows used by the first AP that is carried by the data, where the first AP and the second AP are in coverage of each other, and An AP communicates with the second AP using the same channel.

In this embodiment, as shown in FIG. 2, when the first AP and the second AP are in coverage of each other, and the first AP and the second AP use the same channel to communicate with the MEs in the respective ranges, if An AP sends data to the first ME in the coverage of the first AP, and the second AP can detect the data sent by the first AP, so that the second AP cannot communicate with the ME in the coverage of the second AP. Therefore, when the first AP sends data to the first ME in the range of the first AP, the second AP acquires the number of data streams used by the first AP carried by the data to send the data. The first AP is the AP in the first embodiment and the second embodiment, the interference AP in the third embodiment and the fourth embodiment, and the second AP is interfered in the first embodiment and the second embodiment. AP, AP in the third embodiment and the fourth embodiment.

As a possible implementation manner, when the second AP acquires the number of data flows used by the first AP carried by the data to send the data, the second AP further acquires a channel matrix of the antenna of the first AP to the antenna of the second AP.

In this embodiment, when the first AP and the second AP send data, one of the data streams used in the data may use one antenna or multiple antennas. Therefore, in order to eliminate them from covering each other When the ME communicates with each other, it is necessary to calculate the channel vector of each data stream in which the data is transmitted. Therefore, when the second AP acquires the number of data streams used by the first AP carried by the data to send the data, the channel matrix of the antenna of the first AP to the antenna of the second AP is also acquired.

S702. When the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the second AP sends an interference cancellation request.

As a possible implementation manner, the step of the second AP sending the interference cancellation request is specifically: the second AP sends an interference cancellation request to the first AP, where the interference cancellation request carries the data flow that the second AP expects the first AP to sacrifice. The number and the channel matrix, wherein the number of desired data streams is less than or equal to the number of antennas of the second AP.

As a possible implementation manner, the step for the second AP to send the interference cancellation request is specifically: The second AP sends an interference cancellation request to the controller, where the interference cancellation request carries the number of data streams that the second AP expects the first AP to sacrifice and the channel matrix, where the number of the data stream desirous of being sacrificed is less than or equal to the second The number of antennas of the AP.

In this embodiment, after the second AP acquires the number of data streams used by the first AP carried by the data to send the data, it is determined whether the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, when the data is used. When the number of used data streams is greater than or equal to the number of antennas of the second AP, and the controller does not control the first AP and the second AP, the second AP sends an interference cancellation request to the first AP; the number of data streams used by the data When the number of antennas is greater than or equal to the second AP, and the controller controls the first AP and the second AP, the second AP sends an interference cancellation request to the controller. The interference cancellation request carries the number of data streams that the AP desires to sacrifice and the channel matrix.

Correspondingly, when the number of data streams used by the data is smaller than the number of antennas of the second AP, the second AP does not send an interference cancellation request to the first AP or the controller, and the second AP will cancel the interference of the data to the second AP.

S703. The second AP receives an identifier of the data stream that is sacrificed by the first AP.

As a possible implementation manner, the step of the second AP receiving the identifier of the data stream that is sacrificed by the first AP is specifically:

The second AP receives the identifier of the data stream that is saved by the first AP and sent by the first AP.

The second AP receives an identifier of the data stream that the first AP sacrifices sent by the controller.

S704: The second AP communicates with the second ME by using the data stream that is saved by the first AP that is identified by the identifier.

As a possible implementation manner, when the sum of the number of data streams used by the data and the number of the sacrificed data streams is greater than the number of antennas of the first AP, the identifier carries an identifier of the updated data stream used by the data;

The second AP communicating with the second ME by using the data stream sacrificed by the first AP identified by the identifier may include the following steps:

The second AP obtains, by using the identifier of the updated data stream used by the identifier, the channel vector of the updated data stream used by the data; Calculating a direction vector orthogonal to a channel vector of each updated data stream used by the data, the number of the direction vectors being equal to the number of the sacrificed data streams;

The victim's data stream identified by the identity is used to communicate with a second ME that is used to multiply the signal transmitted by the victim data stream.

In this embodiment, after the second AP receives the identifier of the data stream of the first AP that is sent by the first AP, the second AP will cancel the interference of the data to the data stream that is sacrificed by the first AP: The identifier of the data stream used by the data obtains the updated channel vector of the data stream used by the data, calculates a direction vector orthogonal to the updated channel vector of the data stream used by the data, and uses the victimized data stream identified by the identifier The second ME communicates, the direction vector being used to multiply the signal transmitted by the victim data stream. The channel vector may be carried by the first AP and carried by the identifier of the data stream that is sent by the first AP that is sent to the second AP, or may be the identifier of the data stream used by the second AP to use the updated data. The calculation of the channel matrix is not limited in this embodiment.

As a possible implementation manner, the interference cancellation method further includes the following steps:

The second AP receives the victim data stream update request sent by the first AP;

The second AP responds to the sacrificing data stream update request, and updates the number of data streams that are sacrificed by the first AP; and the second AP sends the updated AP the number of data streams that the first AP sacrifices to the first AP;

Receiving, by the second AP, an identifier of the updated data stream of the updated first AP sent by the first AP;

The second AP communicates with the third ME by using the data stream that is received by the updated first AP.

The second AP receives an identifier of the updated data stream of the updated first AP sent by the controller;

The second AP communicates with the third ME by using the updated data stream sacrificed by the first AP.

In the data transmission method described in FIG. 7, when the first AP sends data to the first ME and the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the second AP sends interference cancellation to the first AP. And after receiving the identifier of the data stream that is saved by the first AP that is sent by the first AP, and using the data stream that is saved by the first AP that is identified by the identifier to communicate with the second ME, the resource may be saved. Please refer to FIG. 8. FIG. 8 is a flowchart of still another interference cancellation method according to an embodiment of the present invention. The interference cancellation method shown in FIG. 8 is described from the perspective of the first AP and the second AP. As shown in FIG. 8, the interference cancellation method may include the following steps. The first AP sends data to the first ME, where the data carries the number of data streams used by the first AP to send data.

S802. The second AP acquires, by the first AP, the number of data flows used by the first AP to send the data. In this embodiment, as shown in FIG. 2, when the first AP and the second AP are in coverage of each other, and the first AP and the second AP use the same channel to communicate with the MEs in the respective ranges, if An AP sends data to the first ME in the coverage of the first AP, and the second AP can detect the data sent by the first AP, so that the second AP cannot communicate with the ME in the coverage of the second AP. Therefore, when the first AP sends data to the first ME that is in the coverage of the first AP, the second AP acquires the number of data flows used by the first AP carried by the data to send the data.

In this embodiment, when the first AP and the second AP send data, one of the data streams used in the data may use one antenna or multiple antennas. Therefore, in order to eliminate them and the MEs in the range of each other To interfere with each other during communication, it is necessary to calculate the channel vector of each data stream in which data is transmitted. Therefore, when the second AP acquires the number of data streams used by the first AP carried by the data to send the data, the channel matrix of the antenna of the first AP to the antenna of the second AP is also acquired.

5803. When the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the second AP sends an interference cancellation request to the first AP.

In this embodiment, after the second AP acquires the number of data streams used by the first AP carried by the data to send the data, it is determined whether the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, when the data is used. When the number of used data streams is greater than or equal to the number of antennas of the second AP, and the controller does not control the first AP and the second AP, the second AP will send an interference cancellation request to the first AP. The interference cancellation request carries the number of data streams that the second AP expects the first AP to sacrifice and the channel matrix of the antenna of the first AP to the antenna of the second AP. The first AP responds to the interference cancellation request, and obtains the data stream that is sacrificed by the first AP from the data stream of the first AP.

In this embodiment, after the first AP receives the interference cancellation request sent by the second AP, the first AP responds to the interference cancellation request, and determines the first AP sacrifice by using the number of data streams that the second AP expects the first AP to sacrifice. The number of data streams is then selected from the data stream of the first AP using the number of data streams of the victim.

In this embodiment, the first AP determines the number of data streams that are sacrificed by the first AP in two ways, one is based on the number of data streams that the second AP expects the first AP to sacrifice, and the other is based on the first AP. The number of idle data streams is the baseline. The manner in which the second AP expects the number of data streams sacrificed by the first AP as a reference: when the second AP expects that the number of data streams sacrificed by the first AP is smaller than the number of antennas of the first AP, the data flow of the first AP is sacrificed The number is equal to the number of data streams that the second AP expects the first AP to sacrifice; since the number of antennas of the first AP is greater than or equal to the number of antennas of the second AP, when the second AP expects the number of data streams sacrificed by the first AP to be equal to the number When the number of antennas of an AP is equal, the number of data streams sacrificed by the first AP is equal to the number of antennas of the first AP minus one. Referring to the number of data streams that are idle by the first AP: when the second AP expects that the sum of the number of data streams sacrificed by the first AP and the number of data streams used by the data is less than or equal to the number of antennas of the first AP, The number of data streams sacrificed by the first AP is equal to the number of data streams that the second AP expects the first AP to sacrifice; when the second AP expects the sum of the number of data streams sacrificed by the first AP and the number of data streams used by the data is greater than When the number of antennas of an AP is equal, the number of data streams sacrificed by the first AP is equal to the difference between the number of antennas of the first AP and the number of data streams used by the data.

S805: The first AP cancels interference of the victim data stream to the first AP.

In this embodiment, since the victim data stream is used by the second AP to communicate with the second ME in the coverage of the second AP, the communication will be interfered with by the first AP, and therefore, The communication of an AP causes interference, and the first AP needs to eliminate interference of the victim data stream to the first AP.

S806. The first AP sends the identifier of the victim data stream to the second AP.

In this embodiment, after the first AP cancels the interference of the victim data stream to the first AP, the identifier of the victim data stream is sent to the second AP, so that the second AP can use the identifier identified by the identifier. The data stream communicates with the second ME.

S807: The second AP communicates with the second ME by using the data stream of the victim identified by the identifier.

5808. The number of data streams used by the first AP to send current data is compared to the updated data. When the number of data streams changes, the first AP sends a victim data stream update request to the second AP.

5809. The second AP responds to the sacrificing data stream update request, and updates the number of data streams that are sacrificed by the first AP.

5810. The second AP sends the updated AP the number of data streams that the first AP sacrifices to the first AP.

S81: The first AP acquires the updated data stream of the first AP victim from the data stream of the first AP by using the updated data stream of the first AP.

5812. The first AP cancels interference of the updated AP data stream to the first AP.

S813. The first AP sends an identifier of the updated data stream of the first AP to the second AP.

In the interference cancellation method described in FIG. 8, when the first AP sends data to the first ME and the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the second AP sends interference cancellation to the first AP. After the request, the first AP acquires the data flow of the first AP from the data flow of the first AP and eliminates the interference of the victim data stream to the first AP, and the second AP uses the data stream of the victim to perform the data flow with the second ME. Communication, therefore, can save resources. Referring to FIG. 9, FIG. 9 is a flowchart of still another interference cancellation method according to an embodiment of the present invention. The interference cancellation method shown in Fig. 9 is described from the perspective of the first AP, the controller, and the second AP. As shown in FIG. 9, the interference cancellation method may include the following steps.

The first AP sends data to the first ME, where the data carries the number of data flows used by the first AP to send data.

S902: The second AP acquires the quantity of data flows used by the first AP carried by the data to send the data. In this embodiment, as shown in FIG. 2, when the first AP and the second AP are in coverage of each other, and the first AP and the second AP use the same channel to communicate with the MEs in the respective ranges, if An AP sends data to the first ME in the coverage of the first AP, and the second AP can detect the data sent by the first AP, so that the second AP cannot communicate with the ME in the coverage of the second AP. Therefore, when the first AP sends data to the first ME that is in the coverage area of the first AP, the second AP will Obtaining the number of data streams used by the first AP carried by the data to send the data.

As a possible implementation manner, when the second AP acquires the number of data flows used by the first AP carried by the data to send the data, the channel matrix of the antenna of the first AP to the antenna of the second AP is also acquired.

In this embodiment, when the first AP and the second AP send data, one of the data streams used in the data may use one antenna or multiple antennas. Therefore, in order to eliminate them and the MEs in the range of each other To interfere with each other during communication, it is necessary to calculate the channel vector of each data stream in which data is transmitted. Therefore, when the second AP acquires the number of data streams used by the first AP carried by the data to send the data, it is also used to obtain a channel matrix of the antenna of the first AP to the antenna of the second AP.

S903. When the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the second AP sends an interference cancellation request to the controller.

In this embodiment, after the second AP acquires the number of data streams used by the first AP carried by the data to send the data, it is determined whether the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, when the data is used. When the number of used data streams is greater than or equal to the number of antennas of the second AP, and the controller controls the first AP and the second AP, the second AP will send an interference cancellation request to the controller. The interference cancellation request carries the number of data streams that the second AP expects the first AP to sacrifice and the channel matrix of the antenna of the first AP to the antenna of the second AP.

S904. The controller determines the number of data streams that the first AP sacrifices.

In this embodiment, after the controller receives the interference cancellation request sent by the second AP, the controller determines the number of data streams that the first AP sacrifices by using the number of data streams that the second AP expects the first AP to sacrifice.

In this embodiment, the controller determines the number of data streams that are sacrificed by the first AP in two ways, one is based on the number of data streams that the second AP expects the first AP to sacrifice, and the other is that the first AP is idle. The number of data streams is benchmarked. The manner in which the second AP expects the number of data streams sacrificed by the first AP as a reference: when the second AP expects that the number of data streams sacrificed by the first AP is smaller than the number of antennas of the first AP, the data flow of the first AP is sacrificed The number is equal to the number of data streams that the second AP expects the first AP to sacrifice; since the number of antennas of the first AP is greater than or equal to the number of antennas of the second AP, when the second AP expects the number of data streams sacrificed by the first AP to be equal to the number When the number of antennas of an AP is equal, the number of data streams sacrificed by the first AP is equal to the number of antennas of the first AP minus one. Referring to the number of data streams idle by the first AP: when the second AP expects the sum of the number of data streams sacrificed by the first AP and the number of data streams used by the data is small When the number of antennas of the first AP is equal to or equal to the number of antennas of the first AP, the number of data streams that the first AP sacrifices is equal to the number of data streams that the second AP expects the first AP to sacrifice; when the second AP expects the number of data streams that the first AP sacrifices When the sum of the number of data streams used by the data is greater than the number of antennas of the first AP, the number of data streams sacrificed by the first AP is equal to the difference between the number of antennas of the first AP and the number of data streams used by the data.

S905: The controller sends an interference cancellation request to the first AP.

In this embodiment, after determining the number of data streams that are sacrificed by the first AP, the controller sends an interference cancellation request to the first AP, where the interference cancellation request carries the channel matrix and the controller indicates that the data flow of the first AP is sacrificed. Quantity.

S906: The first AP responds to the interference cancellation request, and obtains the data stream that is sacrificed by the first AP from the data flow of the first AP.

In this embodiment, after receiving the interference cancellation request sent by the controller, the first AP responds to the interference cancellation request, and uses the controller to indicate the number of data streams sacrificed by the first AP to obtain the first AP from the data stream of the first AP. Sacrificed data stream.

S907: The first AP cancels interference of the victim data stream to the first AP.

In this embodiment, since the salivated data stream is used by the second AP to communicate with the second ME that is in the coverage of the second AP, this will cause interference to the communication of the first AP, and therefore, The first AP needs to eliminate the interference of the victim data stream to the first AP.

S908: The first AP sends an identifier of the victim data stream to the controller.

In this embodiment, after the first AP cancels the interference of the victim data stream to the first AP, the identifier of the victim data stream is sent to the controller.

S909: The controller sends the identifier of the victim data stream to the second AP.

5910. The second AP communicates with the second ME by using the data stream of the victim identified by the identifier. S91: When the number of data streams used by the first AP to send current data changes with respect to the updated number of data streams used by the data, the first AP sends a victim data stream update request to the controller.

5912. The controller updates the number of data streams that are sacrificed by the first AP in response to the sacrificing data stream update request.

S913: The controller sends the updated AP the number of data streams that the first AP sacrifices to the first AP.

5914. The first AP uses the updated first AP to sacrifice the number of data streams from the data flow of the first AP. Obtaining the updated data stream of the first AP sacrificed.

5915. The first AP cancels interference of the updated AP data stream to the first AP.

S916. The first AP sends an identifier of the updated data stream of the first AP to the controller.

S917. The controller sends, to the second AP, an identifier of the updated data stream that is sacrificed by the first AP.

In the data transmission method described in FIG. 9, when the first AP sends data to the first ME and the number of data streams used by the data is greater than or equal to the number of antennas of the second AP, the second AP sends an interference cancellation request to the controller. The controller determines the number of data streams that are sacrificed by the first AP, and then the controller sends an interference cancellation request to the first AP, where the first AP obtains the data stream of the first AP from the data stream of the first AP and eliminates the sacrificed data. The data stream interferes with the first AP, and the second AP uses the sacrificed data stream to communicate with the second ME, thereby saving resources. In one embodiment, embodiments of the present invention further disclose a computer storage medium storing a computer program capable of causing a computer to perform an embodiment of the present invention when a computer program in the computer storage medium is read into a computer All the steps of the disclosed interference cancellation method.

It should be noted that, for the foregoing various method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should understand that the present invention is not limited by the described action sequence. Because certain steps may be performed in other orders or concurrently in accordance with the present invention. In the following, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

A person skilled in the art can understand that all or part of the various methods of the above embodiments can be completed by a program to instruct related hardware, the program can be stored in a computer readable storage medium, and the storage medium can include : Flash drive, Read-Only Memory (ROM), Random Access Memory (RAM), disk or CD.

The interference cancellation method and apparatus provided by the embodiments of the present invention are described in detail above. The principles and implementation manners of the present invention are described herein by using specific examples. The description of the above embodiments is only for helping to understand the method of the present invention. And the core idea thereof; at the same time, those skilled in the art, according to the idea of the present invention, there are some changes in the specific embodiments and application scopes. In summary, the content of the present specification should not be construed as the present invention. limits.

Claims

m ^

1. An access point, comprising:

a sending unit, configured to send data to the first mobile device, where the data carries the number of data streams used by the access point to send the data;

a receiving unit, configured to receive an interference cancellation request when the number of data streams used by the data is greater than or equal to the number of antennas of the interfered access point, where the access point and the interfered access point are in coverage of each other In the range, the access point and the interfered access point use the same channel to communicate; the acquiring unit is configured to obtain the access from the data stream of the access point in response to the interference cancellation request Point-saved data stream;

And a cancellation unit, configured to cancel interference of the victim data stream to the access point, where the victim data stream is used by the interfered access point to communicate with a second mobile device.

The access point according to claim 1, wherein the receiving unit is specifically configured to receive an interference cancellation request sent by the interfered access point, where the interference cancellation request carries the access point The number of antennas to the antenna of the interfered access point and the number of data streams that the interfered access point expects the access point to sacrifice, the number of desired data streams being less than or equal to The number of antennas that are interfered with by the access point.

The access point according to claim 2, wherein the acquiring unit comprises: a first determining subunit, configured to determine, according to the interference cancellation request, whether the number of data streams desirous of sacrificing is less than The number of antennas of the access point, if yes, the number of data streams sacrificed by the access point is equal to the number of data streams that are expected to be sacrificed;

And a first selecting subunit, configured to select, by using the number of the sacrificed data streams, a data stream that is sacrificed by the access point from a data stream of the access point.

The access point according to claim 2, wherein the acquiring unit comprises: a second determining subunit, configured to determine, according to the interference cancellation request, the quantity and the data stream of the desired sacrifice Whether the sum of the number of data streams used by the data is greater than the number of antennas of the access point, and if so, the number of data streams sacrificed by the access point is equal to the number of antennas of the access point and the number According to the difference in the number of data streams used, if not, the number of data streams sacrificed by the access point is equal to the number of data streams expected to be sacrificed;

And a second selecting subunit, configured to select, by using the number of the sacrificed data streams, the data stream sacrificed by the access point from the data stream of the access point.

The access point according to claim 3 or 4, wherein the sending unit is further configured to send the identifier of the victim data stream to the interfered access point.

The access point according to claim 1, wherein the receiving unit is specifically configured to receive an interference cancellation request sent by a controller, where the interference cancellation request carries an antenna of the access point to the a channel matrix of an antenna of the interfered access point and the controller indicating a number of data streams sacrificed by the access point, the number of data streams indicating the victim being victimized by the controller based on the interfered access point Desiring that the number of data streams sacrificed by the access point is determined, the number of data streams desirous of being sacrificed is carried by an interference cancellation request sent by the interfered access point to the controller, the desired sacrifice The number of data streams is less than or equal to the number of antennas of the interfered access point.

The access point according to claim 6, wherein the acquiring unit is specifically configured to respond to the interference cancellation request by using the data flow indicating the number of data streams sacrificed from the access point Selecting a data stream sacrificed by the access point;

The access point according to claim 5 or 7, wherein the access point further comprises: an updating unit, configured to: when the number of data streams used by the data is different from the number of data streams that are sacrificed When the sum is greater than the number of antennas of the access point, the data stream used for the data is updated.

The access point according to claim 8, wherein the eliminating unit comprises: a first calculating subunit, configured to calculate, by using the channel matrix, the victim data stream by the access point a channel vector to the interfered access point;

a second calculation subunit for calculating a channel vector orthogonal to each of said sacrificial data streams A direction vector, the number of direction vectors being equal to the number of data streams used for the updated data, the direction vector being used to multiply the signal transmitted by the updated data stream.

An access point, comprising: a processor and a memory, wherein the memory stores a set of program codes, and the processor is configured to call the program code stored in the memory to perform the following operations:

Transmitting data to the first mobile device, the data carrying the number of data streams used by the access point to send the data;

Receiving an interference cancellation request when the number of data streams used by the data is greater than or equal to the number of antennas of the interfered access point, wherein the access point and the interfered access point are in coverage of each other, and Said access point and said interfered access point use the same channel for communication;

And acquiring, in response to the interference cancellation request, a data stream that is sacrificed by the access point from a data stream of the access point;

Dissipating interference of the victimized data stream to the access point, the victimized data stream being used by the interfered access point to communicate with a second mobile device.

The access point according to claim 10, wherein the manner in which the processor receives the interference cancellation request is specifically:

Receiving an interference cancellation request sent by the interfered access point, where the interference cancellation request carries a channel matrix of an antenna of the access point to an antenna of the interfered access point and an expected interference of the interfered access point The number of data streams sacrificed by the access point, the number of desired data streams being less than or equal to the number of antennas of the interfered access point.

The access point according to claim 11, wherein the processor is configured to acquire, according to the interference cancellation request, a data stream that is sacrificed by the access point from a data stream of the access point. Specifically:

Responding to the interference cancellation request, determining whether the number of data streams desirous of sacrificing is less than the number of antennas of the access point, and if so, the number of data streams sacrificed by the access point is equal to the data stream desirous of sacrificing quantity; The data stream sacrificed by the access point is selected from the data stream of the access point by the number of the sacrificed data streams.

Responding to the interference cancellation request, determining whether the sum of the number of data streams desirous of sacrificing and the number of data streams used by the data is greater than the number of antennas of the access point, and if so, the data sacrificed by the access point The number of streams is equal to the difference between the number of antennas of the access point and the number of data streams used by the data, and if not, the number of data streams sacrificed by the access point is equal to the number of data streams expected to be sacrificed;

The data stream sacrificed by the access point is selected from the data stream of the access point by the number of the sacrificed data streams.

The access point according to claim 12 or 13, wherein after the processor cancels the interference of the victim data stream to the access point, the processor is further configured to invoke the storage in the memory. The program code does the following:

Sending an identification of the victimized data stream to the interfered access point.

Receiving, by the controller, an interference cancellation request, where the interference cancellation request carries a channel matrix of an antenna of the access point to an antenna of the interfered access point, and the controller indicates data sacrificed by the access point The number of streams, the number of data streams indicating the victim being determined by the controller based on the number of data streams that the interfered access point expects the access point to sacrifice, the number of data streams desirous of being sacrificed is And the number of expected descrambled data streams is less than or equal to the number of antennas of the interfered access point, carried by the interference cancellation request sent by the interfered access point to the controller.

16. The access point of claim 15, wherein the processor is responsive to the interference The method for canceling the request and acquiring the data stream that is sacrificed by the access point from the data stream of the access point is specifically:

Responding to the interference cancellation request, using the number of data streams indicated by the indication to select a data stream sacrificed by the access point from a data stream of the access point;

After the processor cancels the interference of the victim data stream to the access point, it is further used to invoke the program code stored in the memory to perform the following operations:

An identification of the victim data stream is sent to the controller.

The access point according to claim 14 or 16, wherein the processor, in response to the interference cancellation request, acquires a data stream sacrificed by the access point from a data stream of the access point. Thereafter, and before canceling the interference of the victim data stream to the access point, the program code stored in the memory is also used to perform the following operations:

The data stream used for the data is updated when the sum of the number of data streams used by the data and the number of sacrificed data streams is greater than the number of antennas of the access point.

The access point according to claim 17, wherein the manner in which the processor cancels interference of the victim data stream to the access point is specifically:

Computing, by the channel matrix, a channel vector of the victim data stream from the access point to the interfered access point;

Calculating a direction vector orthogonal to a channel vector of each of the sacrificial data streams, the number of direction vectors being equal to the number of updated data streams used for the data, the direction vector being used to multiply the updated The signal transmitted by the data stream used by the data.

19. An access point, comprising:

An acquiring unit, when the interfering access point sends data to the first mobile device, acquiring the number of data flows used by the interfering access point carried by the data to send the data, where the interfering access point is The access points are in coverage of each other, and the interfering access point communicates with the access point using the same channel;

a sending unit, configured to: when the number of data streams used by the data is greater than or equal to the access point Send an interference cancellation request when the number of lines is available;

a receiving unit, configured to receive an identifier of the data stream that the interference access point sacrifices;

And a communication unit, configured to communicate with the second mobile device by using the data stream sacrificed by the interference access point identified by the identifier.

The access point according to claim 19, wherein the acquiring unit is further configured to acquire a channel matrix of an antenna of the interference access point to an antenna of the access point.

The access point according to claim 20, wherein the sending unit is specifically configured to send an interference cancellation request to the interference access point, where the interference cancellation request carries the expected location of the access point Describe the number of data streams that the access point sacrifices and the channel matrix, wherein the number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the access point;

The receiving unit is specifically configured to receive, by the interference access point, an identifier of a data stream that is victimized by the interference access point.

The access point according to claim 20, wherein the sending unit is specifically configured to send an interference cancellation request to the controller, where the interference cancellation request carries the interference point desired by the access point The number of data streams that are sacrificed and the channel matrix, wherein the number of desired data streams is less than or equal to the number of antennas of the access point;

The receiving unit is specifically configured to receive an identifier of the data stream that is discarded by the interference access point sent by the controller.

The access point according to claim 21 or 22, wherein when the sum of the number of data streams used by the data and the number of the sacrificed data streams is greater than the number of antennas of the interfering access point The identifier carries an identifier of the updated data stream used by the data;

The communication unit includes:

a calculation subunit for calculating a channel vector of the data stream used for each of the updated data a direction vector of intersection, the number of the direction vectors being equal to the number of the sacrificed data streams; a communication subunit for communicating with the second mobile device using the victimized data stream, the direction vector being used for multiplication The signal transmitted by the sacrificial data stream.

An access point, comprising: a processor and a memory, wherein the memory stores a set of program codes, and the processor is configured to invoke program code stored in the memory to perform the following operations:

And acquiring, by the interfering access point, the number of data streams used by the interfering access point to send the data, where the interfering access point and the access point are Within the coverage of each other, and the interfering access point communicates with the access point using the same channel; when the number of data streams used by the data is greater than or equal to the number of antennas of the access point, the transmission interference is eliminated. Request

Receiving an identifier of the data stream sacrificed by the interference access point;

And communicating with the second mobile device by using the data stream sacrificed by the interfering access point identified by the identifier.

The access point according to claim 24, wherein when the processor acquires the number of data streams used by the interference access point carried by the data to send the data, the processor further Obtaining a channel matrix of the antenna of the interfering access point to an antenna of the access point.

The access point according to claim 25, wherein the manner in which the processor sends the interference cancellation request is specifically:

Sending an interference cancellation request to the interfering access point, where the interference cancellation request carries the number of data streams that the access point expects the interference access point to sacrifice and the channel matrix, wherein the expected sacrifice The number of data streams is less than or equal to the number of antennas of the access point;

The method for receiving, by the processor, the identifier of the data stream that is the victim access point is: receiving the identifier of the data stream that is discarded by the interference access point and sent by the interference access point.

27. The access point of claim 25, wherein the processor transmits interference cancellation The request method is specifically as follows:

Sending an interference cancellation request to the controller, where the interference cancellation request carries the number of data streams that the access point expects the interference access point to sacrifice and the channel matrix, where the number of data streams that are expected to be sacrificed Less than or equal to the number of antennas of the access point;

The manner in which the processor receives the identifier of the data stream that is interfered by the access point is specifically: receiving an identifier of the data stream that is discarded by the interference access point sent by the controller.

The access point according to claim 26 or 27, wherein when the sum of the number of data streams used by the data and the number of the sacrificed data streams is greater than the number of antennas of the interfering access point The identifier carries an identifier of the updated data stream used by the data;

The manner in which the processor communicates with the second mobile device by using the data stream that is discarded by the interference access point identified by the identifier is specifically:

The sacrificial data stream is used to communicate with a second mobile device, the direction vector being used to multiply the signal transmitted by the victim data stream.

29. An interference cancellation method, comprising:

The first access point sends data to the first mobile device, where the data carries the number of data streams used by the first access point to send the data;

When the number of data streams used by the data is greater than or equal to the number of antennas of the second access point, the first access point receives an interference cancellation request, where the first access point and the second access The points are within coverage of each other, and the first access point communicates with the second access point using the same channel; the first access point responds to the interference cancellation request from the first access Acquiring the data stream sacrificed by the first access point in the data stream of the point;

The first access point cancels interference of the victim data stream to the first access point, and the victim data stream is used by the second access point to communicate with a second mobile device.

The method of claim 29, wherein the receiving, by the first access point, the interference cancellation request comprises:

Receiving, by the first access point, an interference cancellation request sent by the second access point, where the interference cancellation request carries a channel matrix of an antenna of the first access point to an antenna of the second access point And the number of data streams that the second access point expects the first access point to sacrifice, the number of the data streams desirous of being sacrificed is less than or equal to the number of antennas of the second access point.

The method according to claim 30, wherein the first access point obtains the first access point from the data flow of the first access point in response to the interference cancellation request Data flow, including:

The first access point determines, according to the interference cancellation request, whether the number of data streams that are expected to be sacrificed is smaller than the number of antennas of the first access point, and if yes, data that is sacrificed by the first access point. The number of streams is equal to the number of data streams that are expected to be sacrificed;

The first access point selects the data stream sacrificed by the first access point from the data stream of the first access point by using the number of the sacrificed data streams.

The method of claim 30, wherein the first access point obtains the first access point from the data flow of the first access point in response to the interference cancellation request Data flow, including:

Responding to the interference cancellation request, the first access point determines whether the sum of the number of data streams desirous of sacrificing and the number of data streams used by the data is greater than the number of antennas of the first access point, and if so, The number of data streams sacrificed by the first access point is equal to the difference between the number of antennas of the first access point and the number of data streams used by the data, and if not, the first access point is sacrificed. The number of data streams is equal to the number of data streams that are expected to be sacrificed;

The method according to claim 31 or 32, wherein, after the first access point cancels the interference of the victim data stream to the first access point, the method further includes: The first access point sends an identifier of the victim data stream to the second access point.

Receiving, by the first access point, an interference cancellation request sent by a controller, where the interference cancellation request carries a channel matrix of an antenna of the first access point to an antenna of the second access point, and the controller Determining a number of data streams sacrificed by the first access point, the number of data streams indicating the victim being desired by the controller based on the second access point expecting the data stream of the first access point to be sacrificed The quantity is determined, the number of the data stream desirous of being sacrificed is carried by an interference cancellation request sent by the second access point to the controller, where the number of the data stream desirously sacrificed is less than or equal to the second The number of antennas at the access point.

The method according to claim 34, wherein the first access point obtains the first access point from the data flow of the first access point in response to the interference cancellation request Data flow, including:

The first access point responds to the interference cancellation request, and selects a data stream that is sacrificed by the first access point from the data stream of the first access point by using the number of the data stream indicating the victim;

After the first access point cancels the interference of the victim data stream to the first access point, the method further includes:

The first access point sends an identification of the victim data stream to the controller.

The method according to claim 33 or 35, wherein the first access point acquires the first access from a data stream of the first access point in response to the interference cancellation request After the data stream of the victim is removed, and the interference of the victim data stream to the first access point is eliminated, the method further includes:

The first access point updates the data stream used by the data when the sum of the number of data streams used by the data and the number of the victimized data streams is greater than the number of antennas of the first access point.

37. The method of claim 36, wherein the first access point eliminates the sacrifice The interference of the data stream of the animal to the first access point includes:

The first access point calculates, by using the channel matrix, a channel vector of the victim data stream from the first access point to the second access point;

The first access point calculates a direction vector orthogonal to a channel vector of each of the victim data streams, the number of the direction vectors being equal to the number of updated data streams used by the data, and the direction vector The signal transmitted by the data stream used to multiply the updated data.

38. An interference cancellation method, comprising:

When the first access point sends data to the first mobile device, the second access point acquires the number of data flows used by the first access point that is sent by the data to send the data, where the first access point The ingress point and the second access point are in coverage with each other, and the first access point and the second access point use the same channel to communicate;

When the number of data streams used by the data is greater than or equal to the number of antennas of the second access point, the second access point sends an interference cancellation request;

Receiving, by the second access point, an identifier of a data stream that is sacrificed by the first access point;

The second access point communicates with the second mobile device by using the data stream sacrificed by the first access point identified by the identifier.

The method according to claim 38, wherein when the second access point acquires the number of data flows used by the first access point that the data carries to send the data, the The two access points also acquire a channel matrix of the antenna of the first access point to the antenna of the second access point.

The method of claim 39, wherein the sending, by the second access point, the interference cancellation request comprises:

Sending, by the second access point, an interference cancellation request to the first access point, where the interference cancellation request carries a quantity and a data flow that the second access point expects the first access point to sacrifice a channel matrix, where the number of desired data streams is less than or equal to the number of antennas of the second access point;

Receiving, by the second access point, the identifier of the data stream that is sacrificed by the first access point, including: The second access point receives an identifier of the data stream that is sacrificed by the first access point that is sent by the first access point.

The second access point sends an interference cancellation request to the controller, where the interference cancellation request carries the number of data streams that the second access point expects the first access point to sacrifice and the channel matrix, where The number of data streams that are expected to be sacrificed is less than or equal to the number of antennas of the second access point;

Receiving, by the second access point, the identifier of the data stream that is sacrificed by the first access point, including: the second access point receiving, by the controller, a data stream that is sacrificed by the first access point Logo.

The method according to claim 40 or 41, wherein when the sum of the number of data streams used by the data and the number of the sacrificed data streams is greater than the number of antennas of the first access point, The identifier carries an identifier of the updated data stream used by the data;

The second access point communicates with the second mobile device by using the data stream that is saved by the first access point that is identified by the identifier, and includes:

And the second access point acquires, by using the identifier of the updated data stream, the channel vector of the updated data stream used by the data;

The second access point calculates a direction vector orthogonal to a channel vector of each updated data stream used by the data, the number of the direction vectors being equal to the number of the sacrificed data streams;

The second access point communicates with the second mobile device using the victim data stream, the direction vector being used to multiply the signal transmitted by the victim data stream.