CN107040356B

CN107040356B - Method and device for cooperative transmission in wireless local area network

Info

Publication number: CN107040356B
Application number: CN201610081423.XA
Authority: CN
Inventors: 韩志强; 侯蓉晖; 王祖袖; 吕开颖; 孙波; 李楠
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-02-04
Filing date: 2016-02-04
Publication date: 2021-01-26
Anticipated expiration: 2036-02-04
Also published as: CN107040356A; WO2017133416A1

Abstract

The invention provides a method and a device for cooperative transmission in a wireless local area network, wherein the method comprises the following steps: a first access point receives first data from a site, wherein the first data carries information for indicating the starting of a multi-point cooperation function, and the site and the first access point belong to the same basic service set; a first access point receives second data forwarded by a second access point, wherein the second access point and the first access point belong to the same multipoint cooperation group, and the second data come from a basic service set to which the first access point belongs; and the first access point judges the first data and the second data and sends a confirmation message for indicating that the first data is correctly received to the site according to the judgment result. By the method and the device, the problem that data transmission among the OBSS stations influences each other in the related technology is solved, and the effect of improving the correctness of the data transmission is achieved.

Description

Method and device for cooperative transmission in wireless local area network

Technical Field

The present invention relates to the field of communications, and in particular, to a method and an apparatus for cooperative transmission in a wireless local area network.

Background

At present, with explosive application of WLAN networks, deployment of WLAN networks is continuously intensive, network loads are continuously increased, and with increase of networks, overlapping of network coverage is more serious, efficiency of WLAN networks tends to decrease significantly, and simply increasing the rate cannot solve the problem. Accordingly, the IEEE standards organization has established a relevant task group to address the WLAN network efficiency problem, wherein extensive attention and research has been directed to solving the problems of collision and interference exacerbation in a densely deployed scenario.

Fig. 1 is a schematic diagram of a basic structure of a radio frame in related art, as shown in fig. 1, in an OFDM system, the basic structure of the radio frame is shown in fig. 1, and includes two parts: physical layer preamble and data part. The physical layer preamble comprises a preamble compatible with the traditional equipment, a short training field, a long training field, a signaling field and the like.

IEEE802.11 defines protocols of Medium Access Control (MAC) and Physical Layer (PHY). Two basic modes of operation are defined: a Distributed Coordination Function (DCF) and a Point Coordination Function (PCF).

In the OFDM system of the WLAN, a frame and an interval between frames are referred to as an Inter Frame Space (IFS). For different needs, various inter-frame spaces are defined: SIFS (short IFS), PIFS (PCF IFS), DIFS (DCF IFS), and the like.

In the WLAN network, a station access channel generally adopts a free contention mode, and in order to ensure the reliability of transmission, frame exchange generally adopted is that a receiving party sends an Acknowledgement message (Acknowledgement) after receiving a specific interframe space (SIFS) after a target station is own data. With the evolution of the version, the IEEE802.11 protocol introduces an aggregation frame operation, and after receiving an aggregation frame, a receiver sends an Acknowledgement message (Block Acknowledgement) after a specific interframe space (SIFS). The Block Acknowledgement includes an address for transmitting the aggregation frame, a start Sequence Number (start Sequence Number), a Traffic identification (Traffic ID, TID for short), and a Bitmap (Block Ack Bitmap) indicating a reception state. Wherein each bit is used to indicate the reception status of a corresponding subframe in the received aggregate frame. If the bit is set to 1, it indicates that the corresponding subframe is correctly received, and if the bit is set to 0, it indicates that the corresponding subframe is not correctly received. Note that, either Acknowledgement or Block Acknowledgement may be collectively referred to as an Acknowledgement.

The receiving process and judgment process of the MAC layer: the method comprises the steps of checking an MPDU (media access control (MAC) protocol data unit) transmitted from a PHY layer, judging whether the MPDU is correct or not, if the MPDU is correct, performing necessary processing on an MAC frame header, judging that the MPDU is a target receiving address, obtaining the MSDU (media access control (MAC) service data unit) from the MPDU, and transmitting the MSDU to an upper layer.

The Basic architecture of the wlan refers to a Basic Service Set (BSS), which includes an Access Point (AP) and a plurality of Stations (STAs) associated with the AP. If two BSS work areas overlap, the same or Overlapping working frequency bands are called Overlapping Basic Service Sets (OBSS), fig. 2 is a schematic diagram of a WLAN Basic Service Set BSS in the related art, as shown in fig. 2, in order to distinguish different BSSs, the BSS can be distinguished through BSS attribution information, in the existing related scheme, the BSS attribution information to be distinguished includes BSSID (Basic Service Set identifier), which is usually the same as the MAC address of an AP and is carried in a frame header of a MAC layer; also known as BSS color, is usually indicated in the frame header of the physical layer.

Fig. 3 is a diagram illustrating performance degradation caused by inter-OBSS collision in the related art, in the application scenario shown in fig. 3, STA1 and AP1 form a BSS, STA2 and AP2 form a BSS, and STA3 and AP3 form a BSS. When STA1 in the OBSS environment contends for the channel to transmit data to AP1, at this time, STA3 and STA1 are hidden terminals from each other, that is, STA3 considers the channel to be idle, and thus the contention channel transmits data to AP3, and at this time, data transmitted by STA3 interferes with reception of STA1 by AP1, which causes network throughput to decrease.

In LTE, there is a Coordinated Multiple Points (Comp) technology, where Multiple base stations form a Comp Coordinated set (Comp Coordinated set) in the downlink, and Multiple Points (Points) receive data from a UE. Due to the large interval between data and acknowledgement in LTE, it is sufficient for the multipoint coordination group to forward. However, in WLAN systems, the interval between data and acknowledgement messages is short (typically 16us for OFDM systems), and processing time is not in time using the comp technique.

In view of the above problems in the related art, no effective solution exists at present.

Disclosure of Invention

The invention provides a method and a device for cooperative transmission in a wireless local area network, which at least solve the problem that OBSS in the related technology is influenced by data transmission among sites.

According to an aspect of the present invention, there is provided a method for cooperative transmission in a wireless local area network, including: a first access point receives first data from a site, wherein the first data carries information for indicating the starting of a multi-point cooperation function, and the site and the first access point belong to the same basic service set; the first access point receives second data forwarded by a second access point, wherein the second access point and the first access point belong to the same multipoint cooperation group, and the second data come from a basic service set to which the first access point belongs; and the first access point judges the first data and the second data and sends a confirmation message for indicating that the first data is correctly received to the site according to the judgment result.

Further, the determining, by the first access point, the first data and the second data, and sending, to the station according to a determination result, a confirmation message indicating that the first data is correctly received includes: the first access point separately judges the first data and the second data; when the judgment result is that the first data or the second data is correctly received, the first access point sends a confirmation message to the station; when the first data and the second data are not correctly received in the judgment result, the first access point combines the first data and the second data, and judges whether the combined data are correct or not; and when the judgment result is correct receiving, the first access point sends a confirmation message to the station.

Further, the first data also carries an operation mode of multipoint cooperation, where the operation mode includes: information merging mode; the information merging mode is used for indicating a processing mode that other wireless access points except the first access point in the multi-point cooperation group receive the first data.

Further, the information merging includes one of: forwarding the medium access control protocol data unit, forwarding the received medium access control protocol service unit, forwarding the receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol service unit, and forwarding the receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol data unit.

Further, when the information merging manner is forwarding a mac protocol data unit, the receiving, by the first access point, the second data forwarded by the second access point includes: the first access point receives a medium access control protocol data unit which is sent by the second access point and is carried by second data; when the information merging manner is to forward the received mac protocol data unit, the receiving, by the first access point, the second data forwarded by the second access point includes: the first access point receives a medium access control service unit which is sent by the second access point and is carried on second data and is checked correctly; when the information merging manner is to forward the received receiving state of the received mac protocol service unit and then forward the received mac protocol service unit, the receiving, by the first access point, the second data sent by the second access point includes: the first access point receives the forwarding receiving state parameter of the second access point; the first access point receives a medium access control service unit which is forwarded by the second access point and is loaded on the second data and checked correctly; when the information merging manner is to forward the received mac protocol data unit again in the receiving state of the received mac protocol service unit, the receiving, by the first access point, the second data sent by the second access point includes: the first access point receives the forwarding receiving state parameter of the second access point; and the first access point receives the medium access control data unit which is forwarded by the second access point and is carried on the second data and is checked correctly.

Further, the receiving the status parameter includes: and sending the medium access control address, the initial sequence number, the service identifier and the receiving state bitmap of the second data.

Further, the operation mode further comprises: an inter-frame space, wherein the inter-frame space is a time interval between the acknowledgement message sent by the first access point and the first data.

Further, the first data also carries response information of multipoint coordination, where the response information at least includes: an access point identification; the access point identification is the access point identification for confirming the wireless frame sent by the station.

Further, the method further comprises: and when the access point identification comprises the first access point, the first access point sends a confirmation message in the frequency band resource of the first data transmission.

Further, the response information further includes: confirming message duration, frequency band resources or space-time stream resources, wherein the confirming message duration is the duration of confirmation of the wireless frame sent by the site; the frequency band resource or the space-time stream resource is a frequency band resource or a space-time stream resource which needs to be occupied when the wireless frame sent by the site is confirmed.

Further, when the response site identifier includes identifiers of the first access point and the second access point, the first access point sends a response acknowledgement message in a frequency band resource or a space-time stream corresponding to the identifier, where a duration of the acknowledgement message meets a requirement of the acknowledgement message carried in the first data; and the second access point sends response confirmation information in the frequency band resource or the space-time stream corresponding to the identifier, wherein the duration of the confirmation information meets the requirement of the confirmation message carried in the first data.

Further, the access point in the coordinated multi-point group stores the basic service set attribution identification of other access points in the coordinated multi-point group.

Further, the first data also carries a basic service set home identifier.

Further, before the first access point receives the first data, the method further comprises: and the first access point informs the station of the coordinated multi-point operation modes supported by the first access point.

According to another aspect of the present invention, there is provided a method for cooperative transmission in a wireless local area network, including: a second access point receives first data from a site, wherein the first data carries information for indicating the starting of a multi-point cooperation function, and the first data is from a basic service set to which a first access point belonging to the same cooperation group with the second access point belongs; the second access point forwards the first data to the first access point.

Further, the information merging includes one of: the method comprises the steps of forwarding a medium access control protocol data unit, forwarding a received medium access control protocol service unit, forwarding a receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol service unit, and forwarding a receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol data unit.

Further, when the information merging manner is forwarding a mac protocol data unit, the sending, by the second access point, second data to the first access point includes: the second access point sends a medium access control protocol data unit carried by second data to the first access point; when the information merging manner is to forward the received mac protocol data unit, the sending, by the second access point, the second data to the first access point includes: the second access point sends a medium access control service unit which is loaded on second data and is checked correctly to the first access point; when the information merging manner is to forward the received mac protocol service unit again in the receiving state of the received mac protocol service unit, the sending, by the second access point, the second data to the first access point includes: the second access point sends a receiving state parameter to the first access point; the second access point sends a medium access control service unit which is loaded on the second data and is checked correctly to the first access point; when the information merging manner is to forward the received mac protocol data unit again in the receiving state of the received mac protocol service unit, the sending, by the second access point, the second data to the first access point includes: the second access point sends a receiving state parameter to the first access point; and the second access point sends the medium access control data unit which is loaded on the second data and is checked correctly to the first access point.

Further, the receiving status parameter includes a medium access control address for sending the second data, a starting sequence number, a service identifier, and a receiving status bitmap.

Further, the operation mode further comprises: inter-frame spacing; and the second access point needs to send the second data to the first access point before the corresponding time of the interframe space.

Further, the first data also carries response information of multipoint coordination, where the response information includes: an access point identification; the access point identifier is an access point identifier for confirming the first data sent by the station.

Further, the method further comprises: and when the access point identification comprises the identification of the second access point, the second access point sends a confirmation message in the frequency band resource sent by the first data.

Further, the response information further includes an acknowledgement message duration, a frequency band resource, or a space-time stream resource, where the acknowledgement message duration is a duration of acknowledgement of the first data sent by the station; the frequency band resource or the space-time stream resource is a frequency band resource or a space-time stream resource that needs to be occupied when the first data sent by the station is confirmed.

Further, when the response information includes the identifier of the second access point, the second access point sends a response acknowledgement information in the frequency band resource or space-time stream corresponding to the identifier, and the duration of the acknowledgement information meets the requirement of the duration of the acknowledgement message carried in the first data.

According to still another aspect of the present invention, there is provided a method for cooperative transmission in a wireless local area network, including: a station sends first data to a first access point, wherein the first data carries information for indicating to start a multi-point cooperation function, and the station and the first access point belong to the same basic service set.

Further, the first data also carries a multi-point cooperation operation mode; wherein the operation mode comprises: information merging mode; the information merging mode is used for indicating a processing mode that other wireless access points except the first access point in the multi-point cooperation group receive the first data.

Further, the response information further includes: confirming message duration, frequency band resources or space-time stream resources, wherein the confirming message duration is the duration of confirmation of the first data sent by the station; the frequency band resource or the space-time stream resource is a frequency band resource or a space-time stream resource that needs to be occupied when the first data sent by the station is confirmed.

According to still another aspect of the present invention, there is provided an apparatus for cooperative transmission in a wireless local area network, applied to a first access point side, including: a first receiving module, configured to receive first data from a station, where the first data carries information for instructing to start a multipoint coordination function, and the station and the first access point belong to a same basic service set; a second receiving module, configured to receive second data forwarded by a second access point, where the second access point and the first access point belong to a same multipoint cooperation group, and the second data is from a basic service set to which the first access point belongs; and the processing module is used for judging the first data and the second data and sending a confirmation message for indicating that the first data is correctly received to the site according to the judgment result.

According to another aspect of the present invention, there is provided an apparatus for cooperative transmission in a wireless local area network, applied to a second access point side, including: a third receiving module, configured to receive first data from a station, where the first data carries information indicating to start a multi-point coordination function, and the first data is from a basic service set to which a first access point belonging to a same coordination group as the second access point belongs; a first sending module, configured to forward the first data to the first access point.

According to another aspect of the present invention, an apparatus for cooperative transmission in a wireless local area network is provided, which is applied to a station side, and includes: a second sending module, configured to send first data to a first access point, where the first data carries information for instructing to start a multi-point coordination function, and the station and the first access point belong to a same basic service set.

In the invention, a first access point receives first data from a station, wherein the first data carries information for indicating to start a multipoint coordination function, and the station and the first access point belong to the same basic service set; and then the first access point receives second data forwarded by the second access point, wherein the second access point and the first access point belong to the same multipoint cooperation group, the second data comes from a station of a basic service set to which the first access point belongs, then the first data and the second data are judged, and a confirmation message for indicating correct reception of the first data is sent to the station according to the judgment result.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a diagram illustrating a basic structure of a radio frame in the related art;

fig. 2 is a diagram illustrating a WLAN basic service set BSS in the related art;

fig. 3 is a diagram illustrating performance degradation caused by collision between OBSSs in the related art;

fig. 4 is a flowchart of a method for cooperative transmission in a wireless local area network according to an embodiment of the present invention;

fig. 5 is a flowchart of a method for cooperative transmission in a wireless local area network according to an embodiment of the present invention;

fig. 6 is a flowchart of a method for cooperative transmission in a wireless local area network according to an embodiment of the present invention;

fig. 7 is a block diagram of a first apparatus for cooperative transmission in a wireless lan according to an embodiment of the present invention;

fig. 8 is a block diagram of a device for cooperative transmission in a wireless lan according to an embodiment of the present invention;

fig. 9 is a block diagram of a device for cooperative transmission in a wireless lan according to an embodiment of the present invention;

fig. 10 is a schematic diagram of multi-BSS coordinated multi-point in accordance with an alternative embodiment of the present invention;

fig. 11 is a diagram illustrating a manner of merging for forwarding mac protocol data units in accordance with an alternative embodiment of the present invention;

fig. 12 is a diagram illustrating a manner of merging for forwarding a received mac protocol service unit in accordance with an alternative embodiment of the present invention;

fig. 13 is a diagram illustrating a merging manner for forwarding a received mac protocol service unit's receipt status parameter and then forwarding the received mac protocol service unit according to an alternative embodiment of the present invention;

fig. 14 is a diagram illustrating a merging manner for forwarding a received mac protocol data unit according to a receiving status parameter of a received mac protocol service unit in accordance with an alternative embodiment of the present invention;

fig. 15 is a diagram illustrating a site assisting an AP in multipoint cooperative group establishment, according to an alternative embodiment of the present invention;

fig. 16 is a first schematic diagram of station indication response information according to an alternative embodiment of the present invention;

fig. 17 is a diagram illustrating a station indication response message according to an alternative embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

In this embodiment, a method for wireless local area network cooperative transmission is provided, and fig. 4 is a flowchart of a method for wireless local area network cooperative transmission according to an embodiment of the present invention, as shown in fig. 4, the flowchart includes the following steps:

step S402: a first access point receives first data from a site, wherein the first data carries information for indicating the starting of a multi-point cooperation function, and the site and the first access point belong to the same basic service set;

step S404: a first access point receives second data forwarded by a second access point, wherein the second access point and the first access point belong to the same multipoint cooperation group, and the second data come from a basic service set to which the first access point belongs;

step S406: and the first access point judges the first data and the second data and sends a confirmation message for indicating that the first data is correctly received to the site according to the judgment result.

In the above steps S402 to S406 of this embodiment, the first access point receives first data from the station, where the first data carries information for instructing to start the multicast coordination function, and the station and the first access point belong to the same basic service set; and then the first access point receives second data forwarded by the second access point, wherein the second access point and the first access point belong to the same multipoint cooperation group, the second data comes from a station of a basic service set to which the first access point belongs, then the first data and the second data are judged, and a confirmation message for indicating correct reception of the first data is sent to the station according to the judgment result.

In an optional implementation manner of this embodiment, as to a manner of determining the first data and the second data and sending, according to a determination result, an acknowledgement message indicating that the first data and/or the second data are correctly received to the station, which is involved in step S406 in this embodiment, the following manner may be implemented:

step S406-1: the first access point independently judges the first data and the second data;

step S406-2: when the judgment result is that the first data or the second data is correctly received, the first access point sends a confirmation message to the station; when the judgment result is that the first data and the second data are not received correctly, the first access point combines the first data and the second data, and judges whether the combined data are correct or not; and when the judgment result is correct reception, the first access point sends a confirmation message to the station.

It should be noted that, in an optional implementation manner of this embodiment, the first data related in this embodiment further carries an operation manner of multipoint cooperation, where the operation manner includes: information merging mode; the information merging mode is used for indicating a processing mode that other wireless access points except the first access point of the coordinated multi-point group receive the first data.

Wherein, the information combination comprises one of the following: forwarding the medium access control protocol data unit, forwarding the received medium access control protocol service unit, forwarding the receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol service unit, and forwarding the receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol data unit.

The different involved information merging modes correspond to different first access points receiving second data modes forwarded by a second access point;

the first method is as follows: when the information merging manner is forwarding the mac protocol data unit, the receiving, by the first access point, the second data forwarded by the second access point includes: a first access point receives a medium access control protocol data unit which is sent by a second access point and is carried in second data;

the second method comprises the following steps: when the information merging manner is to forward the received mac protocol data unit, the receiving, by the first access point, the second data forwarded by the second access point includes: the first access point receives a medium access control service unit which is sent by the second access point and is loaded on the second data and checked correctly;

the third method comprises the following steps: when the information merging manner is to forward the received receiving state of the received mac protocol service unit and then forward the received mac protocol service unit, the receiving, by the first access point, the second data sent by the second access point includes: the first access point receives the forwarding receiving state parameter of the second access point; the first access point receives a medium access control service unit which is forwarded by the second access point and is loaded on the second data and checked correctly;

the method is as follows: when the information merging manner is to forward the received receiving state of the received mac protocol service unit and then forward the received mac protocol data unit, the receiving, by the first access point, the second data sent by the second access point includes: the first access point receives the forwarding receiving state parameter of the second access point; and the first access point receives the medium access control data unit which is forwarded by the second access point and is carried on the second data and is checked correctly.

It should be noted that the above-mentioned receiving state parameters include: and sending the medium access control address, the starting sequence number, the service identifier and the receiving state bitmap of the second data.

In another optional implementation manner of this embodiment, the operation manner further includes: and an inter-frame space, wherein the inter-frame space is a time interval between the acknowledgement message sent by the first access point and the first data.

In another optional implementation manner of this embodiment, the first data further carries response information of multipoint coordination, where the response information at least includes: an access point identification; the access point identifier is an access point identifier for confirming a wireless frame sent by the station. Based on this, when the first access point is included in the access point identification, the first access point transmits an acknowledgement message in the frequency band resource of the first data transmission.

In addition, the response information related in this embodiment further includes: confirming message duration, frequency band resources or space-time stream resources, wherein the confirmation message duration is the duration of confirmation of a wireless frame sent by a site; the frequency band resource or the space-time stream resource is the frequency band resource or the space-time stream resource which needs to be occupied when the wireless frame sent by the station is confirmed. .

In a specific application scenario of this embodiment, when the response site identifier includes identifiers of the first access point and the second access point, the first access point sends a response acknowledgement message in a frequency band resource or a space-time stream corresponding to the identifier, where a duration of the acknowledgement message meets a requirement of an acknowledgement message duration carried in the first data; and the second access point sends response confirmation information when identifying the corresponding frequency band resource or the space-time stream, and the duration of the confirmation information meets the requirement of the duration of the confirmation information carried in the first data. .

For the coordinated multi-point group involved in this embodiment, the access point in the coordinated multi-point group stores the basic service set attribution identifier of other access points in the coordinated multi-point group. That is, in addition to its own basic service set attribution identifier, each access point in the coordinated multi-point group also stores the basic service set attribution identifiers of other access points in the coordinated multi-point group. Optionally, the first data related in this embodiment may also carry a basic service set home identifier.

Before the step S402 of this embodiment involves that the first access point receives the first data, the method of this embodiment may further include: the first access point informs the station of the coordinated multi-point operation modes supported by the first access point.

Fig. 5 is a flowchart of a method for cooperative transmission in a wireless local area network according to an embodiment of the present invention, where as shown in fig. 5, the method includes the steps of:

step S502: the method comprises the steps that a second access point receives first data from a site, wherein the first data carries information used for indicating the starting of a multi-point cooperation function, and the first data is from a basic service set to which the first access point belonging to the same cooperation group with the second access point belongs;

step S504: the second access point forwards the first data to the first access point.

It should be noted that the first data in this embodiment also carries an operation mode of multipoint cooperation, where the operation mode includes: information merging mode; the information merging mode is used for indicating a processing mode that other wireless access points except the first access point of the coordinated multi-point group receive the first data.

Wherein, the information combination comprises one of the following: the method comprises the steps of forwarding a medium access control protocol data unit, forwarding a received medium access control protocol service unit, forwarding a receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol service unit, and forwarding a receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol data unit.

The operation mode involved in this embodiment further includes: and the inter-frame interval is the time interval between the acknowledgement message sent by the first access point and the first data sent by the first access point, and the second access point needs to send the second data to the first access point before the corresponding moment of the inter-frame interval.

In addition, the first data in this embodiment further carries response information of multipoint cooperation, where the response information includes: an access point identification; the access point identifier is an access point identifier for confirming the first data sent by the station.

Based on the response information, the method of this embodiment may further include: and when the access point identification comprises the identification of the second access point, the second access point sends a confirmation message in the frequency band resource of the first data transmission.

In an optional implementation manner of this embodiment, the response information further includes an acknowledgment message duration, a frequency band resource, or a space-time stream resource, where the acknowledgment message duration is a duration of acknowledgment for the first data sent by the station; the frequency band resource or the space-time stream resource is a frequency band resource or a space-time stream resource that needs to be occupied when the first data sent by the station is confirmed.

Based on this, when the response information includes the identifier of the second access point, the second access point sends the acknowledgement information of the response in the frequency band resource or the space-time stream corresponding to the identifier, and the duration of the acknowledgement information meets the requirement of the duration of the acknowledgement message carried in the first data.

Fig. 6 is a flowchart of a method for cooperative transmission in a wireless local area network according to an embodiment of the present invention, where as shown in fig. 6, the method includes the steps of:

step S602: and the station sends first data to the first access point, wherein the first data carries information for indicating the starting of the multi-point cooperation function, and the station and the first access point belong to the same basic service set.

In an optional implementation manner of this embodiment, the first data further carries an operation manner of multipoint cooperation; wherein, the operation mode includes: information merging mode; the information merging mode is used for indicating a processing mode that other wireless access points except the first access point of the coordinated multi-point group receive the first data.

In addition, the first data also carries response information of multipoint cooperation, wherein the response information includes: an access point identification; the access point identifier is an access point identifier for confirming the first data sent by the station.

In an optional implementation manner of this embodiment, the response information further includes: confirming message duration, frequency band resources or space-time stream resources, wherein the confirmation message duration is the duration of confirmation of first data sent by a station; the frequency band resource or the space-time stream resource is a frequency band resource or a space-time stream resource that needs to be occupied when the first data sent by the station is confirmed.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

In this embodiment, a device for wireless local area network cooperative transmission is further provided, where the device is used to implement the foregoing embodiment and preferred embodiments, and details are not repeated for what has been described. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 7 is a block diagram of a first apparatus for cooperative transmission in a wireless local area network according to an embodiment of the present invention, where the apparatus is applied to a first access point side, and as shown in fig. 7, the apparatus includes: a first receiving module 72, configured to receive first data from a station, where the first data carries information for instructing to start a multipoint coordination function, and the station and a first access point belong to a same basic service set; a second receiving module 74, coupled to the first receiving module 72, configured to receive second data forwarded by a second access point, where the second access point and the first access point belong to the same coordinated multi-point group, and the second data is from a basic service set to which the first access point belongs; and the processing module 76 is coupled to the second receiving module 74, and is configured to determine the first data and the second data, and send a confirmation message indicating that the first data is correctly received to the station according to the determination result.

Fig. 8 is a block diagram of a second apparatus for cooperative transmission in a wireless local area network according to an embodiment of the present invention, where the apparatus is applied to a second access point side, and as shown in fig. 8, the apparatus includes: a third receiving module 82, configured to receive first data from a station, where the first data carries information indicating to start a multi-point coordination function, and the first data is from a basic service set to which a first access point belonging to a same coordination group as a second access point belongs; a first sending module 84, coupled to the third receiving module 82, configured to forward the first data to the first access point.

Fig. 9 is a block diagram of a third apparatus for cooperative transmission in a wireless local area network according to an embodiment of the present invention, where the apparatus is applied to a station side, and as shown in fig. 9, the apparatus includes: the second sending module 92 is configured to send first data to the first access point, where the first data carries information used to instruct to start the multipoint coordination function, and the station and the first access point belong to the same basic service set.

The invention will now be illustrated with reference to an alternative embodiment thereof;

the first alternative embodiment:

as shown in fig. 3, there are two BSSs in the network, and the APs of the two BSSs are AP1 and AP2, respectively. STA1 and AP1 belong to the same BSS, and STA2 and AP2 belong to the same BSS. The AP1 and the AP2 establish a coordinated multipoint group. The indication of the coordinated multi-point group can be distinguished by mutually saving the basic service set home identifiers or generating the basic coordinated group identifiers. In this embodiment, it is described that the basic service set attribution identifier is stored, the AP1 sends the basic service set attribution identifier (e.g., BSS Color ═ 1) of the basic service set to the AP2, and the AP2 also sends the basic service set attribution identifier (e.g., BSS Color ═ 2) of the BSS to the AP 1. AP1 and AP2 store basic service set home identities that form a basic service set with themselves.

The communication protocol negotiated between the AP1 and the AP2 is not limited to the wireless lan technology, and the establishment of the multipoint coordination group may be performed by other wireless technologies or wired technologies. Here, only the network case of two BSSs is listed, but the establishment of the multipoint coordination group is not limited to the case of only two BSSs, and the number of wireless access points forming the multipoint coordination group may be any number. In addition, the AP1 and the AP2 know whether there is an overlapping area, and besides performing channel scanning by the AP1 and the AP2 themselves, the AP may also report the overlapping area through an associated station, for example, the STA1 performs channel scanning to report the situation of surrounding BSSs, and at this time, since the STA1 may scan the AP2, the AP2 related information is reported to the AP 1. The AP1 and the AP2 know each other whether there is an overlapping area, and can also be notified by a higher network element, such as a network element that manages the AP1 and the AP 2. In addition, the initiation of the coordinated multipoint group establishment may be initiated by any AP or a network element managing the APs.

During association, STA1 and AP1 may negotiate capabilities for multipoint coordination, and STA1 knows the merging mode and/or response mode supported by AP 1. Or by means of a broadcast (beacon) notification.

In the data transmission process, the STA1 may determine whether to start the multipoint coordination function according to a network condition (e.g., a transmission success rate of previous data) or a length of a current radio frame, and may optionally carry multipoint coordination operation mode information. In this embodiment, the station only carries an indication of starting the multi-point coordination function and a basic service set home identifier (BSS color ═ 1) associated with the station in the transmitted radio frame, and both the two pieces of information are indicated by the physical layer preamble.

The AP1 receives the radio frame of the STA1, determines that the multipoint coordination function is activated by the station by analyzing a physical layer Preamble (Preamble), and knows that the radio frame is addressed to the AP1 by setting BSS color carried by the physical layer Preamble to 1, and then the AP1 receives a subsequent data packet. If the subsequent data portion can be correctly received, the AP1 need not process the data forwarded by the other APs, and if the AP1 cannot correctly receive the subsequent data portion, the AP2 waits for the data forwarded by the AP 3526 for a certain time, which depends on the processing power of the AP 1. The specific time should be less than a default short interframe space (SIFS).

When the AP2 correctly receives the preamble of the data sent by the STA1 and discovers that the STA1 starts the coordinated multi-point function, the AP2 forwards the received data to the AP1, and the AP2 may also forward the correctly received data to the AP 1. Even in the OBSS case, overlap occurs due to the BSS color generation. If there is another BSS (AP is AP5) around the AP2, the BSS Color of the AP5 is the same as the BSS Color of the AP1 (BSS Color is 1), at this time, the AP2 receives the data from the BSS where the AP5 is located, finds that its preamble turns on the multipoint coordination function, and the BSS Color carried by the data frame is 5, and the AP2 forwards the received data to the AP 1. After receiving the data forwarded by the AP2, the AP1 may determine, through information such as MAC address, that the data is not data transmitted by the station in the BSS, and discard the data. If the data forwarded by the AP2 is erroneous, merging will not have much worse effect than now.

The AP1 judges the data forwarded by the AP2, independently judges the data if the data can be independently judged to be correct or judges the data to be correct or wrong independently if the data can be combined with the signal received by the AP1 to judge the data to be correct or wrong. The AP1 may not receive the two signals correctly, but may receive the combined signal correctly.

The AP1, if it can receive correctly, sends an acknowledgement message in the wireless frame sent by STA 1. AP1 sends an acknowledgement frame to STA1 if it has processed the data forwarded by AP2 within SIFS and determined that the data is correct. If an aggregate frame (a-MPDU) is in use, the AP1 may acknowledge the message as long as one subframe (subframe) is correct.

An alternative embodiment two:

the AP1 and multiple APs (e.g., AP2, AP4) form a coordinated multi-point group, and in the process of establishing the coordinated multi-point group, the AP1, the AP2, and the AP4 notify the basic service set home identifier of each other, in this embodiment, a BSS color is used for distinction, as shown in fig. 10, fig. 10 is a schematic diagram of coordinated multi-point of multiple BSSs according to an alternative embodiment of the present invention.

STA1 and AP1 belong to the same BSS, AP1 successfully receives a physical layer Preamble (Preamble) of STA1, and the analyzed station starts a multipoint cooperation function, and through BSS color carried in the physical layer Preamble, AP1 knows that subsequent data is addressed to itself, and then AP1, if it can correctly receive the subsequent data part, does not need to wait for data forwarded by other APs at AP1, and if AP1 cannot correctly receive the subsequent data part, waits for other forwarded data within a specific time, which depends on the processing capability of AP 1.

AP2 and AP4 correctly receive preamble of data transmitted by STA1, and if STA1 starts the coordinated multi-point function, AP2 and AP4 forward the received data to AP 1.

If AP2 is in a receive state or does not properly receive the preamble transmitted by STA1, AP2 cannot forward to AP 1.

The AP1 judges the data forwarded by the AP2 and the AP4, independently judges the data if the data can be independently judged to be wrong, and can be combined with the signal received by the AP1 to judge the wrong data if the data can be independently judged to be wrong. The AP1 may not receive the multipath signals correctly, but may receive the combined signal correctly.

The AP1, if it can receive correctly, sends an acknowledgement message in the wireless frame sent by STA 1.

An alternative embodiment is as follows:

the AP1, the AP2, and the AP4 establish a coordinated multi-point group, and the AP1 sends a basic service set identifier (e.g., BSS color) to the AP2 and the AP4, as shown in fig. 10.

STA1 and AP1 belong to the same BSS, STA1 instructs to start the multipoint coordination function in the transmitted radio frame, and instructs an information combining mode, where the information combining mode includes original signal forwarding, the receiving AP only forwards the correct signal, the receiving AP first forwards the receiving state, and the like, and the supported information combining mode is not limited to the above-described case, and other information combining modes may also be instructed.

The information combining manner may jointly indicate the supported combining state through several bits in a physical layer preamble (preamble), and as shown in table 1, 2 bits are used to indicate the supported combining manner. Wherein, if the indication is 00, the MAC PDU is forwarded; if the indication is 01, forwarding the received medium access control protocol service unit; if the indication is 10, the receiving state parameter of the received medium access control protocol service unit is forwarded, and then the received medium access control protocol service unit is forwarded. Table 1 only lists two bit indications, and if there are more merging ways, more bits can be used for indication.

TABLE 1

The AP1 successfully receives the physical layer Preamble (Preamble) of the STA1, and the station is analyzed to start the multipoint cooperation function, and the AP1 knows that the subsequent data is sent to itself through the BSS color carried by the physical layer Preamble.

If the indicated information merging manner is forwarding medium access control protocol data units (MPDUs), fig. 11 is a schematic diagram of merging manner as forwarding medium access control protocol data units according to an alternative embodiment of the present invention, and as shown in fig. 11, then if the AP1 can correctly receive the subsequent data portion, the AP1 does not need to wait for data forwarded by other APs, and if the AP1 cannot correctly receive the subsequent data portion, the AP2 and the AP4 wait for data forwarded by the AP2 and the AP4 within a specific time (default SIFS or a physical layer frame header indicating a new inter-frame interval), where the specific time depends on the processing capability of the AP 1.

AP2 and AP4 correctly receive the preamble of data sent by STA1, find that STA1 starts the multipoint coordination function, and indicate to forward the mac protocol data unit, AP2 and AP4 forward the received MPDU to AP 1.

The AP1 judges the data forwarded by the AP2 and the AP4, independently judges the data if the data can be independently judged to be wrong, and can be combined with the signal received by the AP1 to judge the wrong data if the data can be independently judged to be wrong. The AP1 may not receive the two signals correctly, but may receive the combined signal correctly.

If the indicated information merging mode is that the receiving AP forwards the received mac service unit, the AP2 and the AP4 perform correct and incorrect determination (check) on the received data, and correct MSDU contained in the data is forwarded to the AP1, fig. 12 is a schematic diagram of a merging mode according to an alternative embodiment of the present invention for forwarding the received mac service unit, as shown in fig. 12, STA1 sends an aggregation packet (a-MPDU) including four subframes (subframe 1, subframe 2, subframe 3, subframe 4), each subframe includes one MSDU, and the four subframes correspond to MSDU1, MSDU 2, MSDU 3, MSDU 4. AP1 successfully received subframee 1 and subframee 3, AP2 successfully received MSDU1 and MSDU 4, and AP4 successfully received MSDU1, MSDU 2, MSDU 3,. AP2 forwards the correct MSDU1 and MSDU 4 to AP1, and AP4 forwards the correct MSDU1, MSDU 2, MSDU 3 to AP 1. At this time, the necessary identification, address, sequence number, etc. of the source of these MSDUs need to be distinguished. The AP1 responds by generating an acknowledgement frame based on the union of the correct data forwarded by all APs, at which time the AP1 can determine that all the data it receives is correct, and send an acknowledgement message to the AP1 that contains all the subframes are correct.

If the indicated information merging mode is to forward the received receiving state parameter of the medium access control protocol service unit first and then to forward the received medium access control protocol service unit. Then the AP2 and the AP4 make correct and incorrect judgments on the received data, generate a status bit map from the processed result, and carry the MAC address of the station, the starting sequence number confirmed by the status bit map, the service identifier, and the like, fig. 13 is a schematic diagram of retransmitting the received MAC service unit to the received MAC service unit in a merging manner according to the alternative embodiment of the present invention, and as shown in fig. 13, the corresponding subframe number is identified below the status map sent by the AP2 and the AP4 to the AP 1.

STA1 transmits an aggregate packet (a-MPDU) including four subframes (subframe 1, subframe 2, subframe 3, subframe 4), each of which includes one MSDU or a-MSDU. The four subframes correspond to MSDU1, MSDU 2, MSDU 3, MSDU 4. AP1 successfully received MSDU1 and MSDU 3, AP2 successfully received MSDU1 and MSDU 4, and AP4 successfully received MSDU1, MSDU 2 and MSDU 3. The AP2 and AP4 first feed back the correct and incorrect reception status of the received subframe (including necessary difference information, MAC address of station, starting sequence number of status bitmap confirmation, service identifier) to AP1, and at a later time, AP2 and AP4 then forward the correct MAC protocol service unit to AP1, AP2 sends MSDU1 and MSDU 4, and AP4 sends MSDU1 and MSDU 2 and MSDU 3. At this time, it is necessary to distinguish necessary identification, address, serial number, etc. of the data sources. The AP1 generates an acknowledgement frame according to the union of the status bit maps forwarded by all APs to perform an acknowledgement message (in fig. 13, the acknowledgement message only indicates information of a Block Ack Bitmap, and other information is set in the Block Ack accordingly). Although the AP1 itself has not successfully received all subframes, it can be determined that all subframes are correctly received through the information forwarded by the AP2 and the AP 4. If AP2 and AP4 do not receive any MSDUs, then no status forwarding and MSDU forwarding occurs.

If the indicated information merging mode is to forward the received receiving state parameter of the medium access control protocol service unit first and then to forward the received medium access control protocol data unit. Then the AP2 and the AP4 make correct and incorrect judgments on the received data, generate a status bit map according to the processing result, and carry the MAC address of the station, the starting sequence number confirmed by the status bit map, the service identifier, and the like, fig. 14 is a schematic diagram of forwarding the received MAC protocol data unit to the received MAC protocol service unit in a merging manner according to the optional embodiment of the present invention, and as shown in fig. 14, the corresponding subframe number is identified below the status map sent by the AP2 and the AP4 to the AP 1.

STA1 transmits an aggregate packet (a-MPDU) comprising four sub-frames (subframe 1, subframe 2, subframe 3, subframe 4), one MPDU per sub-frame. The four subframes correspond to MPDU1, MPDU 2, MPDU 3, and MPDU 4. The AP1 successfully received MPDU1 and MPDU 3, the AP2 successfully received MPDU1 and MPDU 4, the AP4 successfully received MPDU1, MPDU 2 and MPDU 3. The AP2 and AP4 feed back the correct and incorrect reception status of the received subframe (including necessary distinction information, MAC address of station, starting sequence number of status bitmap confirmation, service identifier) to AP1, and at a later time, AP2 and AP4 forward the correct MAC protocol data unit to AP1, AP2 transmits MPDU1 and MPDU 4, and AP4 transmits MPDU1 and MPDU 2 and MPDU 3. At this time, the necessary identification, address, sequence number, etc. of the data source need not be distinguished (the MAC frame header of the MPDU contains this information). The AP1 responds by generating an acknowledgement frame according to the union of the status bit maps forwarded by all APs (in fig. 14, the acknowledgement message only indicates information of a Block Ack Bitmap, and other information is set in the Block Ack accordingly, in the above scenario, although the AP1 does not successfully receive all subframes, the AP1 can determine that it successfully receives all subframes through the information forwarded by the AP2 and the AP 4.

Considering that the AP cannot handle the response with the short inter-frame space, the inter-frame space is included in the coordinated multipoint operation mode, and is the inter-frame space in which the receiving station sends the acknowledgement message. The AP1 responds with this indication. If the wireless frame carries the inter-frame space, AP2 and AP4 forward the information to AP1 in the inter-frame space, otherwise do not forward.

An alternative embodiment is four:

the STA1 scans surrounding network conditions and informs the associated AP1 of the existing BSS information in the surrounding and saves the relevant information.

The AP1 establishes a multipoint cooperation group according to the BSS information reported by the STA1 and the BSS information scanned by the AP, fig. 15 is a schematic diagram of assisting the AP to establish the multipoint cooperation group according to an alternative embodiment of the present invention, and as shown in fig. 15, the STA1, the STA2 and the AP1 are associated with each other. The APs that STA1 can scan are AP2, AP3, AP 4. The APs that STA2 can scan are AP5 and AP 6. STA1 and STA2 store information scanned by themselves, respectively. STA1 and STA2 report these information to AP 1. AP1 and STA2, STA3, STA4, STA5, STA6 establish a coordinated multipoint group. The AP1 and AP2, AP3, AP4, AP5, AP6 mutually hold basic service set home indication information.

AP1 notifies STA1 and STA2 of the established coordinated multipoint group information by unicast or broadcast. The multipoint cooperation information includes information such as MAC addresses of AP2, AP3, STA4, STA5, STA6, and corresponding BSS color.

The STA1 indicates to start the multipoint coordination function in the transmitted wireless frame, and indicates response information of multipoint coordination, where the information includes information such as a station identifier that needs to respond, a response duration, and a corresponding frequency band resource or space-time stream resource. The response information of the multipoint cooperation can be carried through PHY layer signaling or MAC layer signaling. When the MAC layer signaling is carried, the MAC layer signaling can be carried through an independent subframe or a domain. The AP information that the STA1 chooses to respond to may be determined according to the result of its own scanning and the established coordinated multipoint group information.

Fig. 16 is a schematic diagram showing station indication response information according to an alternative embodiment of the present invention, where fig. 16 illustrates that, although an established multipoint coordination group includes AP2, AP3, STA4, STA5, and STA6, the AP that needs to be confirmed correctly determines received data after receiving a wireless frame sent by STA1 and responds to resources indicated by the wireless frame. However, STA1 found that it can only receive information from AP2, AP3, and STA4 during the previous network listening process. At this time, the STA1 indicates the multi-point response information in the transmitted wireless frame, and instructs the AP1, AP2, AP3, and STA4 to transmit the acknowledgement message in a specific space-time resource (MU-MIMO) or frequency band resource (OFDMA) manner.

These APs then forward the data to AP 1. An AP that is not scheduled a response by STA1 may not forward data to AP 1. According to the received acknowledgement message, if the STA1 can determine that all subframes are correctly received according to the union of the state diagrams (Block ACK bitmap) in the acknowledgement messages sent by all APs, retransmission is not required, and if it determines that some subframes are received incorrectly according to the acknowledgements sent by all responding APs, only the wrong subframes need to be transmitted.

Alternative embodiment five

Fig. 17 is a diagram illustrating station indication response information according to an alternative embodiment of the present invention, where as shown in fig. 17, if the STA1 sends a non-aggregation frame, the response information of multipoint cooperation may be indicated in a physical layer preamble or MAC layer signaling through multipoint cooperation. The multipoint cooperation response information only comprises the site indication. The AP correctly receives the wireless frame and the AP indicated in the multi-point cooperative response information directly responds to an Acknowledgement (ACK), all ACKs are sent at the same frequency band resource using the same rate. Even if STA1 sends a non-aggregated frame, it can indicate by one bit in the physical layer preamble or MAC layer signaling through multi-point cooperation that all APs correctly receiving the radio frame belonging to the cooperative group directly respond to Acknowledgements (ACKs), all ACKs are sent at the same frequency band resource with the same rate, and all ACKs use the same scrambling code seed.

The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:

Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for cooperative transmission in a wireless local area network, comprising:

a first access point receives first data from a station, where the first data carries information for instructing to start a multipoint coordination function, the station and the first access point belong to the same basic service set, and the first data further carries an operation mode of multipoint coordination, where the operation mode includes: information merging mode; the information merging mode is used for indicating a processing mode that other wireless access points except the first access point of the multi-point cooperation group receive the first data;

the first access point receives second data forwarded by a second access point, wherein the second access point and the first access point belong to the same multipoint cooperation group, and the second data come from a basic service set to which the first access point belongs;

the first access point judges the first data and the second data and sends a confirmation message for indicating that the first data is correctly received to the site according to a judgment result;

wherein the determining, by the first access point, the first data and the second data, and sending, to the station according to a determination result, a confirmation message indicating that the first data is correctly received includes:

the first access point separately judges the first data and the second data; when the judgment result is that the first data or the second data is correctly received, the first access point sends a confirmation message to the station;

when the first data and the second data are not correctly received in the judgment result, the first access point combines the first data and the second data, and judges whether the combined data are correct or not; and when the judgment result is correct receiving, the first access point sends a confirmation message to the station.

2. The method of claim 1, wherein the information merging manner comprises one of: forwarding the medium access control protocol data unit, forwarding the received medium access control protocol service unit, forwarding the receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol service unit, and forwarding the receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol data unit.

3. The method of claim 2,

when the information merging manner is forwarding a mac protocol data unit, the receiving, by the first access point, the second data forwarded by the second access point includes: the first access point receives a medium access control protocol data unit which is sent by the second access point and is carried by second data;

when the information merging manner is to forward the received mac protocol service unit, the receiving, by the first access point, the second data forwarded by the second access point includes: the first access point receives a medium access control protocol service unit which is sent by the second access point and is loaded on second data and checked correctly;

when the information merging manner is to forward the received receiving state parameter of the received mac protocol service unit and then forward the received mac protocol service unit, the receiving, by the first access point, the second data sent by the second access point includes: the first access point receives the forwarding receiving state parameter of the second access point; the first access point receives a medium access control protocol service unit which is forwarded by the second access point and is loaded on the second data and checked correctly;

when the information merging manner is to forward the received receiving state parameter of the received mac protocol service unit and then forward the received mac protocol data unit, the receiving, by the first access point, the second data sent by the second access point includes: the first access point receives the forwarding receiving state parameter of the second access point; and the first access point receives the medium access control protocol data unit which is forwarded by the second access point and is carried on the second data and is checked correctly.

4. The method of claim 3, wherein the receiving the status parameter comprises: and sending the medium access control address, the starting sequence number, the service identifier and/or the receiving state bitmap of the second data.

5. The method of claim 1, wherein the operational mode further comprises: an inter-frame space, wherein the inter-frame space is a time interval between the acknowledgement message sent by the first access point and the reception of the first data.

6. The method according to claim 1, wherein the first data further carries response information of multipoint coordination, wherein the response information at least includes: an access point identification; the access point identification is the access point identification for confirming the wireless frame sent by the station.

7. The method of claim 6, further comprising:

and when the access point identification comprises the first access point, the first access point sends a confirmation message in the frequency band resource of the first data transmission.

8. The method of claim 6, wherein the response information further comprises: confirming message duration, frequency band resources or space-time stream resources, wherein the confirming message duration is the duration of confirmation of the wireless frame sent by the site; the frequency band resource or the space-time stream resource is a frequency band resource or a space-time stream resource which needs to be occupied when the wireless frame sent by the site is confirmed.

9. The method of claim 8, wherein when the access point identities include a first identity of the first access point and a second identity of the second access point,

the first access point sends a response confirmation message in a frequency band resource or a space-time stream resource corresponding to the first identifier, wherein the duration of the confirmation message meets the requirement of the confirmation message carried in the first data;

and the second access point sends response confirmation information in the frequency band resource or the space-time stream resource corresponding to the second identifier, wherein the duration of the confirmation information meets the requirement of the confirmation message carried in the first data.

10. The method of claim 1, wherein the access point in the coordinated multi-point group maintains basic service set home identities of other access points in the coordinated multi-point group.

11. The method of claim 1, wherein the first data further carries a basic service set home identifier.

12. The method of claim 1, wherein prior to the first access point receiving the first data, the method further comprises:

and the first access point informs the station of the coordinated multi-point operation modes supported by the first access point.

13. A method for cooperative transmission in a wireless local area network, comprising:

a second access point receives first data from a site, wherein the first data carries information for instructing to start a multipoint coordination function, the first data is from a basic service set to which a first access point belonging to a same coordination group as the second access point belongs, and the first data also carries an operation mode of multipoint coordination, and the operation mode includes: information merging mode; the information merging mode is used for indicating a processing mode that other wireless access points except the first access point of the multi-point cooperation group receive the first data;

the second access point sends second data to the first access point, so that the first access point independently judges the first data and the second data; when the judgment result is that the first data or the second data is correctly received, the first access point sends a confirmation message to the station; when the first data and the second data are not correctly received in the judgment result, the first access point combines the first data and the second data, and judges whether the combined data are correct or not; and when the judgment result is correct reception, the first access point sends a confirmation message to the site, wherein the second access point and the first access point belong to the same multipoint cooperation group, and the second data come from a basic service set to which the first access point belongs.

14. The method of claim 13, wherein the information merging manner comprises one of: the method comprises the steps of forwarding a medium access control protocol data unit, forwarding a received medium access control protocol service unit, forwarding a receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol service unit, and forwarding a receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol data unit.

15. The method of claim 14,

when the information merging manner is forwarding a mac protocol data unit, the sending, by the second access point, second data to the first access point includes: the second access point sends a medium access control protocol data unit carried by second data to the first access point;

when the information merging manner is to forward the received mac protocol service unit, the sending, by the second access point, the second data to the first access point includes: the second access point sends a medium access control protocol service unit which is loaded on second data and is checked correctly to the first access point;

when the information merging manner is to forward the received receiving state parameter of the received mac protocol service unit and then forward the received mac protocol service unit, the sending, by the second access point, the second data to the first access point includes: the second access point sends a receiving state parameter to the first access point; the second access point sends a medium access control protocol service unit which is loaded on the second data and is checked correctly to the first access point;

when the information merging manner is to forward the received receiving state parameter of the received mac protocol service unit and then forward the received mac protocol data unit, the sending, by the second access point, the second data to the first access point includes: the second access point sends a receiving state parameter to the first access point; and the second access point sends the medium access control protocol data unit which is loaded on the second data and is checked correctly to the first access point.

16. The method of claim 15, wherein the reception status parameters include a medium access control address, a starting sequence number, a service identifier and/or a reception status bitmap for transmitting the second data.

17. The method of claim 13, wherein the operational mode further comprises: an inter-frame space, wherein the inter-frame space is a time interval between the acknowledgement message sent by the first access point and the reception of the first data.

18. The method of claim 13, wherein the first data further carries response information of multipoint coordination, and the response information includes: an access point identification; the access point identifier is an access point identifier for confirming the first data sent by the station.

19. The method of claim 18, further comprising:

and when the access point identification comprises a second identification of the second access point, the second access point sends a confirmation message in the frequency band resource sent by the first data.

20. The method of claim 18, wherein the response information further comprises an acknowledgement message duration, a frequency band resource, or a space-time stream resource, wherein the acknowledgement message duration is a duration of an acknowledgement of the first data transmitted by the station; the frequency band resource or the space-time stream resource is a frequency band resource or a space-time stream resource that needs to be occupied when the first data sent by the station is confirmed.

21. The method of claim 18, wherein when the response message includes a second identity of the second access point,

22. A method for cooperative transmission in a wireless local area network, comprising:

a station sends first data to a first access point, where the first data carries information for indicating to start a multipoint coordination function, the station and the first access point belong to the same basic service set, and the first data further carries an operation mode of multipoint coordination, where the operation mode includes: information merging mode; the information merging mode is used for indicating a processing mode that other wireless access points except the first access point of the multi-point cooperation group receive the first data;

the station receiving an acknowledgement message indicating correct receipt of the first data comprises:

the first access point receives second data forwarded by a second access point, and the first access point independently judges the first data and the second data; when the judgment result is that the first data or the second data is correctly received, the first access point sends a confirmation message to the site, wherein the second access point and the first access point belong to the same multipoint cooperation group, and the second data is from a basic service set to which the first access point belongs;

23. The method of claim 22, wherein the information merging mode comprises one of: forwarding the medium access control protocol data unit, forwarding the received medium access control protocol service unit, forwarding the receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol service unit, and forwarding the receiving state parameter of the received medium access control protocol service unit and then forwarding the received medium access control protocol data unit.

24. The method of claim 22, wherein the first data further carries response information of multipoint coordination, and the response information includes: an access point identification; the access point identifier is an access point identifier for confirming the first data sent by the station.

25. The method of claim 24, wherein the response information further comprises: confirming message duration, frequency band resources or space-time stream resources, wherein the confirming message duration is the duration of confirmation of the first data sent by the station; the frequency band resource or the space-time stream resource is a frequency band resource or a space-time stream resource that needs to be occupied when the first data sent by the station is confirmed.

26. An apparatus for cooperative transmission in a wireless local area network, applied to a first access point side, comprising:

a first receiving module, configured to receive first data from a station, where the first data carries information for instructing to start a multipoint coordination function, the station and the first access point belong to a same basic service set, and the first data further carries an operation mode of multipoint coordination, where the operation mode includes: information merging mode; the information merging mode is used for indicating a processing mode that other wireless access points except the first access point of the multi-point cooperation group receive the first data;

a second receiving module, configured to receive second data forwarded by a second access point, where the second access point and the first access point belong to a same multipoint cooperation group, and the second data is from a basic service set to which the first access point belongs;

the processing module is used for judging the first data and the second data and sending a confirmation message for indicating that the first data is correctly received to the site according to a judgment result;

wherein the processing module is further configured to perform the following operations: the first access point separately judges the first data and the second data; when the judgment result is that the first data or the second data is correctly received, the first access point sends a confirmation message to the station;

27. An apparatus for cooperative transmission in a wireless local area network, applied to a second access point side, comprising:

a third receiving module, configured to receive first data from a station, where the first data carries information indicating to start a multipoint coordination function, the first data is from a basic service set to which a first access point belonging to a same coordination group as the second access point belongs, and the first data further carries an operation mode of multipoint coordination, where the operation mode includes: information merging mode; the information merging mode is used for indicating a processing mode that other wireless access points except the first access point of the multi-point cooperation group receive the first data;

a first sending module, configured to send second data to the first access point, so that the first access point separately determines the first data and the second data; when the judgment result is that the first data or the second data is correctly received, the first access point sends a confirmation message to the station; when the first data and the second data are not correctly received in the judgment result, the first access point combines the first data and the second data, and judges whether the combined data are correct or not; and when the judgment result is correct reception, the first access point sends a confirmation message to the site, wherein the second access point and the first access point belong to the same multipoint cooperation group, and the second data come from a basic service set to which the first access point belongs.

28. An apparatus for cooperative transmission in a wireless local area network, applied to a station side, comprising:

a second sending module, configured to send first data to a first access point, where the first data carries information for instructing to start a multipoint coordination function, the station and the first access point belong to a same basic service set, and the first data further carries an operation mode of multipoint coordination, where the operation mode includes: information merging mode; the information merging mode is used for indicating a processing mode that other wireless access points except the first access point of the multi-point cooperation group receive the first data;

wherein the apparatus is further configured to: receiving an acknowledgement message indicating correct receipt of the first data comprises: