WO2013091509A1

WO2013091509A1 - Link adaptation method, device, and system

Info

Publication number: WO2013091509A1
Application number: PCT/CN2012/086628
Authority: WO
Inventors: 伍天宇; 李长乐; 郝帅; 陈睿
Original assignee: 华为技术有限公司
Priority date: 2011-12-23
Filing date: 2012-12-14
Publication date: 2013-06-27
Also published as: CN103178943A

Abstract

Disclosed is a data sending method in a wireless local area network. The method comprises: an access point (AP) receiving a data frame sent from a terminal STA; the AP recording acknowledgment information ACK indicating whether the data frame sent from each terminal is successfully received; and the AP sending a cluster acknowledgement frame Cluster ACK to the terminal STA, the acknowledgement frame Cluster ACK being received by the terminal STA and then being used by each terminal to determine whether the data frame is successfully received by the AP, and the cluster acknowledgement frame comprising the acknowledgment information ACK and a terminal identifier corresponding to the acknowledgement frame. In the method of the present invention, an acknowledgement control frame, namely, Cluster ACK is used, so that the AP can acknowledge, by using one Cluster ACK frame, the data sent from multiple STAs to the AP, thereby reducing the network overhead incurred by ACK and improving the system performance.

Description

Method, device and system for link adaptation

The present invention relates to the field of communications, and more particularly to a method, apparatus and system for link adaptation in the field of communications. Background technique

In the current WLAN standard, the traditional response mechanism is DATA/ACK mode, that is, the sender needs to receive an acknowledgment frame ACK after sending a packet or data to confirm whether the packet or data is successfully transmitted. The DATA/ACK exchange has a fixed overhead. This overhead includes the contention period, the overhead associated with transmitting the frame itself, the radio conversion time (SIFS) at the receiving end, and the transmission time of the ACK frame. Although the overhead is basically fixed, the time to send a data frame is not fixed. The longer the data frame is sent, the smaller the ratio of fixed overhead to the entire transmission duration. The shorter the time for transmitting data frames, the greater the ratio of fixed overhead to the entire transmission duration.

In the sensor network, smart grid, etc., the packets sent by the terminal STAs are usually short, so the traditional DATA/ACK mode brings a lot of system overhead. Therefore, reducing the system overhead caused by traditional ACK will improve network performance. Summary of the invention

The embodiment of the invention provides a method for transmitting data in a wireless local area network and an access point AP, which reduces system overhead caused by ACK to improve network performance.

In one aspect, an embodiment of the present invention provides a method for transmitting data in a wireless local area network, including: an access point AP receiving a data frame sent by a terminal STA;

The access point AP records an acknowledgement information ACK of whether the data frame sent by each terminal is successfully received;

The access point AP sends a cluster acknowledgement frame Cluster ACK to the terminal STA, where the acknowledgement frame Cluster ACK is used by each terminal after receiving the terminal STA to determine whether the transmitted data frame is accessed by the terminal. The point AP is successfully received. The cluster acknowledgement frame includes the acknowledgement information ACK and a terminal identifier corresponding to the acknowledgement frame.

On the other hand, an embodiment of the present invention provides an access point device AP, including: a receiving unit, configured to receive a data frame sent by the terminal STA;

a cluster acknowledgement frame cluster ACK generating unit, configured to generate a cluster acknowledgement frame Cluster ACK according to whether the data frame sent by each terminal successfully receives the acknowledgement information ACK, where the acknowledgement frame Cluster ACK is used by the terminal STA Each of the following terminals determines whether the transmitted data frame is successfully received by the access point AP, where the cluster acknowledgement frame includes the acknowledgement information ACK and a terminal identifier corresponding to the acknowledgement frame;

And a sending unit, configured to send the cluster acknowledgement frame Cluster ACK to the terminal STA. Based on the foregoing technical solution, the method and device of the embodiment of the present invention use a new ACK control frame, Cluster ACK, so that the AP can simultaneously respond to data sent by multiple STAs to it by using one Cluster ACK frame. Thereby reducing the network overhead caused by ACK and improving the performance of the system.

FIG. 1 is a schematic diagram of a general format of a Cluster ACK frame according to an embodiment of the present invention.

2 is a flow chart of a method for transmitting data in an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a specific example of a Cluster ACK frame.

4 is a schematic structural diagram of still another example of a Cluster ACK frame.

FIG. 5 is a schematic structural diagram of another example of a Cluster ACK frame.

6 is a schematic structural diagram of a specific example of a Cluster-added ACK frame.

FIG. 7 is a schematic structural diagram of an access point device according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings in the embodiments. The embodiment of the present invention may be that data transmission is being performed between a station (STA) and an access point (AP, Access Point) in the WLAN. Sometimes the AP can be considered a special site. It can be considered that the station (STA) and the access point are the sender and receiver of each other. Therefore, in the following embodiments, the device may be a STA or an AP, and the system may be a WLAN composed of a station (STA) and an access point (AP, Access Point).

Referring to FIG. 1, an embodiment of the present invention uses a new frame cluster to confirm a frame Cluster ACK, which

Cluster ACK frame includes 2Byte long frame control information Frame Control field, 2Byte long Duration Duration/ID field, frame body and 4 Byte long frame check sequence FCS. The Frame Control field of the Cluster ACK frame is different from the existing ACK frame. The subtype value of the ACK frame is 1101, and the Subtype value of the Cluster ACK frame can be a value of 0000-0110. To indicate the new frame type. Of course, in actual operation, the value of the Subtype value may be specified in the system, and the negotiation between the AP and the STA is good or the synchronization is achieved, and the foregoing is an embodiment. The Duration/ID field of the Cluster ACK frame indicates the duration in us. The frame body is used to respond to the reception of the data frame. The FCS field includes a 32-bit CRC to verify the integrity of the packet.

Use the above. Cluster ACK frame, the AP does not respond to each data frame, but sends a Cluster ACK frame at a specific time to uniformly reply several data frames sent by one or more STAs received within a certain period of time. The AP maintains a list of information. After successfully receiving a data frame, the ID of the sending node of the data frame and the number of the data frame are recorded in the list. Before sending a Cluster ACK frame, the AP writes the information in the information list to the frame body according to certain rules. After receiving the Cluster ACK frame, the STAs interpret the information in the frame according to certain rules to determine whether the data frame sent by itself is correctly received.

Referring to FIG. 2, a flowchart of a method for sending data according to an embodiment of the present invention includes:

S101. The access point AP receives the data frame sent by the terminal STA.

S103, the access point AP records an acknowledgement information ACK that is successfully received by the data frame sent by each terminal;

S105, the access point AP sends a cluster acknowledgement frame Cluster ACK to the terminal STA, where the acknowledgement frame Cluster ACK is used by each terminal after receiving the terminal STA to determine whether the transmitted data frame is received. The access point AP is successfully received. The cluster acknowledgement frame includes at least two acknowledgement information ACKs, and further includes a terminal identifier corresponding to the acknowledgement frame ACK.

Based on the foregoing technical solution, the method in the embodiment of the present invention uses a new ACK control frame, a Cluster ACK, so that the AP can simultaneously respond to data sent by multiple STAs to it by using one Cluster ACK frame. Thereby reducing the network overhead caused by ACK and improving the performance of the system.

The method is described below in combination with different implementations of different scenarios.

The access point device AP communicates with the STA, and the AP replies to the Cluster ACK frame after receiving the data frame sent by the STA. If n terminals are communicated with the AP, the frame body of the Cluster ACK frame is composed of a 1 byte long Cluster-ID field and an "n" Byte long "confirmation" field, and "n" is a node that the Cluster ACK frame can confirm. Quantity. Here it is recommended that n is 8 or 16. In the specific implementation, if The system supports that the number of terminals supported by the transmission of the cluster ACK is not limited. In this embodiment and the following embodiments, eight terminals are taken as an example, but the duration of the frame may be increased to 16 or other required length. . Each terminal can support 8 frames of ack, and the acknowledgment information ACK (acknowledgement field) of each corresponding terminal is 1 byte, wherein 8 bits indicate 8 acknowledgement information ACKs, which in turn correspond to the reception of 8 data frames sent by the terminal. Happening. Embodiments are also described in the case of simultaneously feeding back 8 data frames. However, by increasing the frame length, it is possible to simply increase the reception condition of simultaneously transmitting 16 data frames of one terminal, or other numbers of data frames.

In this embodiment, the structure of the Cluster ACK frame is as shown in FIG. 3. The Cluster ACK frame includes a 2 Byte Long Frame Control field, a 2 Byte Length Duration/ID field, a frame body, and a 4 Byte long FCS field.

The frame body is composed of an lByte long Cluster-ID field and an "n" Byte long "confirmation" field, and "n" is the number of nodes that can be confirmed by a Cluster ACK frame. The Cluster-ID is used to indicate that the group identifier of the group to which the terminal corresponding to the acknowledgement information ACK in the data frame is sent is sent.

Each Byte in the "Confirm" field indicates the reception of data sent by a STA. The acknowledgment information ACK is described in the trunk confirmation frame body body portion, and the kth acknowledgment information ACK is the acknowledgment information ACK of the kth terminal in the group; where l ≤ k ≤ n. For example, the first Byte indicates the reception of the data transmitted by the first STA of the group, the second Byte indicates the reception of the data transmitted by the second STA in the group, and the kth Byte indicates the kth of the group. The reception of data sent by the STA. Each bit in the Byte indicates an acknowledgment message ACK of a data frame sent by the STA, and "0" indicates that the AP fails to receive the data frame, " indicates that the AP receives the data frame successfully. For example: the first bit in a Byte is "0" , indicating that the first data frame sent by the STA is accepted by the AP, and the eighth bit in a Byte is "Γ", indicating that the eighth data frame sent by the STA is successfully accepted by the AP. Of course, the values corresponding to the success or failure of the reception can be interchanged. The FCS field includes a 32-bit CRC to verify the integrity of the packet.

During the communication between the AP and the STA, the AP maintains a list of information. After successfully receiving a data frame, the ID of the sending node of the data frame and the number of the data frame are recorded in the list.

Before sending the Cluster ACK frame, the AP writes the information in the list to the frame body, and writes the reception condition of the mth (m<=8) data frames sent by the k STAs to the mth bit of the kth byte. , "0" means AP accepts failure, "1" means AP receives success. For example: AP successfully received index=l The 8th data frame sent by the STA is written with "1" in the 8th bit of the 1st "Answer" field. After receiving the Cluster ACK frame, the STAs interpret the information in the frame to determine whether the data frame sent by itself is correctly received. For example, after the STA with index=l receives the Cluster ACK frame, it reads the first Byte, and the eighth bit is “Γ”, indicating that the 8th data frame it sent has been successfully received by the AP.

Referring to Figure 4, yet another implementation. The Cluster ACK frame includes a 2Byte long Frame Control field, a 2Byte long Duration/ID field, a frame body and a 4Byte long FCS field. The frame body is composed of an lByte long Cluster-ID field, an n-byte long index index field and an "n" Byte long "confirmation" field, where n is the number of nodes that can be confirmed by a Cluster ACK frame. The Cluster-ID indicates the number of the group to which the sending node of the data frame to be acknowledged belongs. The acknowledgment information ACK is described in the trunk body of the cluster confirmation frame, and includes n information groups, and ACK is per information. The index index field indicates the intra-group number of the transmitting node of the data frame to be acknowledged.

Each Byte in the "confirm" field indicates the reception status of the STA transmission data indicated by the previous "index" (ie, the acknowledgment information ACK), and each bit in the Byte indicates the reception status of a data frame sent by the STA, " 0" indicates that the AP failed to receive the data frame, "" indicates that the AP successfully received the data frame. For example, the first bit in a Byte is "0", indicating that the first data frame sent by the STA is accepted by the AP, one The 8th bit in the Byte is "Γ", indicating that the eighth data frame sent by the STA is successfully accepted by the AP.

During the communication between the AP and the STA, the AP maintains a list. After successfully receiving a data frame, the ID of the sending node of the data frame and the number of the data frame are recorded in the list.

Before sending the Cluster ACK frame, the AP writes the information in the list into the frame body, and writes the intra-group number of the sending node that needs to confirm the data frame into the "index" field, and the sequence number is m (m<=8). The reception of the data frame is written to the mth bit in the following "confirmation" field. "0" indicates that the AP accepts the failure, and "1" indicates that the AP has successfully received. For example, if the AP successfully receives the 8th data frame sent by the STA with index=l, write "1" in an "index" and write 1 in the 8th bit of the following "confirm" field.

After receiving the Cluster ACK frame, the STAs interpret the information in the frame. The STA needs to find the index field with the same index value, and reads the information in the "confirm" field behind it to determine whether the data frame sent by the STA is Receive correctly. For example, after the STA with index=l receives the Cluster ACK frame, it finds the "index" field of index=l, and the 8th bit in the following "confirm" field. It is "1", indicating that the 8th data frame it sent has been successfully received by the AP. The value of the 8 bits is determined according to the receiving condition of the data frame.

See Figure 5 for another implementation. The Cluster ACK frame includes a 2Byte long Frame Control field, a 2Byte long Duration/ID field, a frame body and a 4Byte long FCS field. The acknowledgement information ACK is recorded in the trunk confirmation frame body body portion, and includes n information groups, each of which includes one of the association identifier AID and the acknowledgement information ACK of the terminal indicated by the AID. (ie, the frame body is composed of "n" 2 Byte long AID fields and "n" lByte long "confirmation" fields, "n" is the number of nodes that can be confirmed by a Cluster ACK frame.) The AID field indicates the need The AID (Association Identifier) of the transmitting node of the confirmed data frame is the terminal corresponding to the acknowledgment information ACK. Each bit in the "confirm" field following the AID field indicates the acknowledgment message ACK of a data frame sent by the STA. "0" indicates that the AP failed to receive the data frame, and "1" indicates that the AP successfully received the data frame. For example, the first bit in the "confirmation" field is "0", indicating that the first data frame sent by the STA is accepted by the AP, and the eighth bit in the "confirm" field is "1", indicating the STA. The eighth data frame sent is accepted by the AP successfully.

Further, it is also possible to sequentially write all AIDs in sequence, and then sequentially write all the acknowledgment information ACK. The confirmation information ACK is recorded in the cluster confirmation frame body body portion including two information groups, n pieces of the AID sequentially recorded and n pieces of the confirmation information ACK sequentially recorded, wherein the kth confirmation information ACK is the group The acknowledgement information ACK of the kth terminal.

Before sending the Cluster ACK frame, the AP writes the information in the list into the frame body, and writes the AID of the sending node of the data frame to be confirmed into an AID field, and sets the data frame of the sequence number m (m<=8). The receiving condition (ie, the acknowledgment message ACK) is written to the mth bit in the following "confirmation" field. For example, if the AP successfully receives the 8th data frame sent by the STA with AID=000000 111111, it is written in an AID field. "000000 111111", write 1 in the 8th bit in the "Confirm" field after this AID field. After receiving the Cluster ACK frame, the STAs interpret the information in the frame. The STA needs to find the AID field with the same AID value, and reads the information in the "Confirm" field behind it to determine whether the data frame sent by the STA is Receive correctly. For example, after the STA of AID=00000000 11111111 receives the Cluster ACK frame, it finds The AID field of AID=00000000 11111111, the 8th bit in the "confirm" field is "1", indicating that the 8th data frame it sent has been successfully received by the AP.

Each of the foregoing embodiments may send an ACK to multiple STAs at a time, and may also send an ACK corresponding to multiple frames for each STA. Since each acknowledgment information ACK (acknowledgement field) is 1 byte, there are 8 bits, which in turn correspond to the reception of 8 data frames corresponding to the acknowledgment information ACK.

For all the above embodiments, a maximum of 8 terminals are taken as an example, and each terminal transmits a maximum of 8 data frames in one terminal during the duration of the Cluster ACK frame. If a STA sends more than 8 data frames during this time, we use the Cluster-added ACK frame to reply to the remaining data frames. The structure of the Cluster-added ACK frame is shown in Figure 6.

Cluster-added ACK frame includes 2Byte long Frame Control field, 2Byte long

Duration/ID field, 6 Byte long terminal address RA field, frame body and 4 Byte long FCS field, cluster acknowledgement additional frame Cluster-added ACK further includes an address corresponding to the acknowledgement frame and after the 8th data frame The acknowledgement information ACK of the data frame. The Frame Control field, Duration/ID field, RA field and FCS field format are the same as those used in the existing ACK frame format or the foregoing embodiment.

The reception of the eighth and subsequent data frames transmitted by the STA is recorded in the frame body. The kth bit in the frame body indicates the reception of the k+8th data frame sent by the STA, "0" indicates that the AP accepts the failure, and "1" indicates that the AP receives the success. For example, the 8th bit is "1", indicating that the 16th data frame sent by the STA has been correctly received by the AP.

If a STA sends more than 8 data frames during this time, the AP writes the address of the STA to the RA, and writes the reception of the remaining data frames to the frame body.

After receiving the Cluster-added ACK, the STA first determines whether the RA is its own address, and if so, receives it, and if not, discards it. After receiving the Cluster-added ACK, the information in the frame is read to determine the reception of the transmitted data frame.

Further, in order to use the above method of the embodiment, the structure of the transmitted data frame can be modified in the data sent by the terminal. Select a bite in the frame control field of the data frame, for example, the 14th bit, set to the "More Data" field, which may be set to be in the data or management frame sent by the AP to a STA in PS mode. 1. It is used to indicate that the AP caches more data frames for the STA. However, in the data frame sent by the STA, its value is always set to zero. By using the "More Data" field to indicate the acknowledgment mode that the STA wishes to obtain, when the value is set to 0, it indicates that the STA wants to wait for the confirmation mode of the Cluster ACK, and when its value is set to 1, it indicates that the STA wishes to wait. The way to confirm the traditional ACK. Or in order to support compatibility with the legacy ACK, it is necessary to use the reserved field in the data frame header of the STAs sent to the AP as an indication. The value of any bit in the reserved field of the frame header is used to determine the acknowledgement mode that the STA needs to obtain. In the embodiment of the present invention, the terminal STA sends a data frame including a multiple data indication field more data in the frame control field frame control field, and the terminal STA uses the indication field more data to notify the access point AP terminal STA whether to support the use of the cluster acknowledgement frame. Cluster ACK. It can be agreed that More Data is set to 1 to indicate that the cluster confirmation frame is supported. Of course, 0 can also be set to support the use of the cluster acknowledgement frame, and the AP and the STA can agree on the agreement or the specification.

In a specific implementation, the system can use the Cluster ACK feedback mode, and the above setting of more data or indication bits is not required.

Further, after the encapsulation of the Cluster ACK frame is completed, the AP broadcasts the frame after the beacon frame. STAs do not need to be woken up to receive the frame. Yes, the system supports energy-saving options. Or after the encapsulation of the Cluster ACK frame is completed, the AP can broadcast the frame at any time. STAs need to be additionally woken up to receive the frame.

In the embodiment of the present invention, the transmitting end and the receiving end use the method in the foregoing method embodiment to perform communication, and the transmitting end and the receiving end can complete the foregoing method and each process, so when introducing the transmitting end and the receiving end in the system, See the method embodiment for the method. Each functional module or unit or device such as a processor in the device can respectively implement the functions and operations of the above methods. The AP can completely perform the above method as an execution subject of the above method. An embodiment of the present invention further provides an access point device AP that can be used in an infinite local area network.

Referring to FIG. 7, a schematic structural diagram of an access point device in an embodiment. The access point 80 includes: a receiving unit 801, configured to receive a data frame sent by the terminal STA;

The cluster acknowledgement frame cluster ACK generating unit 803 is configured to generate a cluster acknowledgement frame Cluster ACK according to whether the data frame sent by each terminal successfully receives the acknowledgement information ACK, and confirm that the frame Cluster ACK is used by the terminal STA to determine each transmission. Whether the data frame is successfully received by the access point AP, where the cluster acknowledgement frame includes the acknowledgement information ACK and the terminal identifier corresponding to the acknowledgement frame;

The sending unit 805 is configured to send a cluster acknowledgement frame Cluster ACK to the terminal STA.

Further, the cluster acknowledgement frame generated by the cluster acknowledgement frame cluster ACK generating unit 803 further includes: frame control information Frame control, where the frame control information includes a subtype indication value subtype value for identifying the frame as a cluster acknowledgement frame, and the value of the subtype value is 0000-0110. In actual use, there are n terminals in the system, and the cluster confirmation frame includes n confirmation information.

ACK;

The cluster acknowledgment frame generated by the cluster ACK generating unit 803 further includes a cluster identifier. The cluster ID is used to indicate the group identifier of the group to which the terminal corresponding to the acknowledgment information ACK in the transmission data frame belongs.

The acknowledgement information ACK is recorded in the trunk body of the cluster confirmation frame, and the kth acknowledgement information ACK is the acknowledgement information ACK of the kth terminal in the group; where l≤k≤n, l< n <8„

The cluster acknowledgement frame further includes a terminal identifier of the terminal for use as a terminal identifier of the terminal; the acknowledgement information ACK is recorded in the cluster acknowledgement frame. The cluster acknowledgement frame body body portion generated by the cluster ACK generation unit 803 includes two information groups, which are sequentially recorded. n AIDs and n pieces of acknowledgment information ACK sequentially recorded, wherein the kth acknowledgment information ACK is the acknowledgment information ACK of the kth terminal in the group, l<k <n, 1< η <8 „

The confirmation information ACK is described in the cluster confirmation frame body body portion generated by the cluster confirmation frame Cluster ACK generation unit 803, and includes n information groups, each of which includes the index number of the terminal in the group and the confirmation information ACK of the index corresponding terminal; ≤ n ≤ 8. Or,

The confirmation information ACK is described in the cluster confirmation frame. The cluster acknowledgement frame body body portion generated by the cluster ACK generation unit 803 includes two information groups, n AIDs sequentially recorded, and n pieces of acknowledgement information ACK sequentially recorded, wherein the kth acknowledgement information ACK Confirmation information ACK for the kth terminal in the group, l< k <n, 1< η <8„

Further, the access point device further includes an information recording unit 807 for recording the confirmation information ACK in the information list. Then the cluster acknowledgement frame Cluster ACK generation unit 803 reads the information in the information list to generate a cluster acknowledgement frame Cluster ACK.

The cluster acknowledgment frame Cluster ACK generating unit 803 is further configured to generate a cluster acknowledgment additional frame Cluster-added ACK if the number of data frames sent by the terminal in the duration of the cluster acknowledgment frame is greater than 8, the cluster acknowledgment additional frame Cluster-added ACK includes Confirming the address corresponding to the frame and the acknowledgement information ACK of the data frame after the eighth data frame;

The sending unit 805 is further configured to send a cluster acknowledgement additional frame Cluster-added ACK.

The access point device of the present invention uses an acknowledgment control frame, Cluster ACK, so that the AP can make A Cluster ACK frame is used to simultaneously acknowledge data sent by multiple STAs to it. Thereby reducing the network overhead caused by ACK and improving the performance of the system.

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

Claims

Rights request

A method for transmitting data in a wireless local area network, the method comprising: the access point AP receiving a data frame sent by the terminal STA;

The access point AP sends a cluster acknowledgement frame Cluster ACK to the terminal STA, where the acknowledgement frame Cluster ACK is used by each terminal after receiving the terminal STA to determine whether the transmitted data frame is accessed by the terminal. The point AP successfully receives; wherein the cluster acknowledgement frame includes at least two pieces of acknowledgement information ACK, and further includes a terminal identifier corresponding to the acknowledgement frame ACK.

The method according to claim 1, wherein the cluster acknowledgement frame further comprises: frame control information Frame control, wherein the frame control information includes a subtype indication value subtype value for identifying the frame as a cluster acknowledgement frame. The value of the subtype value is from 0000-0110.

The method according to claim 1 or 2, wherein the terminal is n terminals, and the cluster acknowledgement frame includes n pieces of acknowledgement information ACK;

The cluster confirmation frame further includes a cluster identifier, and the cluster ID is used to indicate that the group identifier of the group to which the terminal corresponding to the acknowledgement information ACK in the data frame is sent is sent;

The confirmation information ACK is described in the cluster confirmation frame body body portion, and the kth acknowledgment information ACK is the acknowledgment information ACK of the kth terminal in the group;

Where l ≤ k ≤ n.

4. The method according to claim 1 or 2, characterized in that

If the terminal is n terminals, the cluster acknowledgment frame includes n pieces of the acknowledgment information ACK, and the cluster acknowledgment frame further includes a cluster identifier, a cluster ID, used to indicate that the acknowledgment information ACK in the data frame is sent. The group ID of the group to which the corresponding terminal belongs;

The confirmation information ACK is described in the cluster confirmation frame body body portion, and includes n pieces of message confirmation information ACK. Method according to claim 1 or 2, characterized in that If the terminal is n terminals, the cluster acknowledgment frame includes n pieces of the acknowledgment information ACK, and the cluster acknowledgment frame further includes an association identifier AID of the terminal, which is used as a terminal identifier of the terminal;

The confirmation information ACK is recorded in the trunk confirmation frame body body portion, and includes n information groups, each of which includes one of the association identifier AID and the acknowledgement information ACK of the terminal indicated by the AID.

6. A method according to claim 1 or 2, characterized in that

If the terminal is n terminals, the cluster acknowledgment frame includes n pieces of the acknowledgment information ACK, and the cluster acknowledgment frame further includes an association identifier AID of the terminal, which is used as a terminal identifier of the terminal;

The confirmation information ACK is described in the cluster confirmation frame body body portion including two information groups, n pieces of the AID sequentially recorded and n pieces of the confirmation information ACK sequentially recorded, wherein the kth confirmation information ACK is The acknowledgement information ACK of the kth terminal in the group.

The method according to any one of claims 1 to 6, wherein each of the confirmation information ACKs in the cluster acknowledgement frame includes reception status information for a plurality of data frames, each of the The reception status information of the data frame occupies 1 bit bit. The method according to any one of claims 1-6, wherein the cluster acknowledgement frame further comprises: FCS information, where the FCS information includes a check field for verifying the cluster acknowledgement frame Cluster ACK. Integrity.

The method according to any one of claims 1-6, wherein the access point AP records whether the data frame sent by each terminal successfully receives the acknowledgement information ACK, including the access point. The AP records the acknowledgement information ACK in the information list;

The access point AP sequentially writes information in the information list to the cluster acknowledgement frame before the access point AP sends a cluster acknowledgement frame Cluster ACK to the terminal STA. The method according to any one of claims 3-6, wherein if the number of data frames sent by the terminal during the duration of the cluster acknowledgement frame is greater than 8, The method further includes: sending, by the access point AP, a cluster acknowledgement frame Cluster ACK to the terminal STA, and sending a cluster acknowledgement additional frame Cluster-added ACK to the terminal STA; the cluster confirming an additional frame Cluster-added ACK includes The address corresponding to the acknowledgement frame and the acknowledgement information ACK of the data frame subsequent to the eighth data frame.

The method according to claim 10, wherein the cluster confirming the additional frame Cluster-added ACK comprises:

The frame control information is frame control, and the frame control information includes a subtype indication value, a subtype value, to identify the frame as a cluster acknowledgement frame, and the value of the subtype value is from 0000-0110.

The method according to any one of claims 1-11, wherein the access point AP sends the cluster acknowledgement frame Cluster ACK by means of a broadcast.

The method according to any one of claims 1 to 12, wherein the terminal STA transmits a data frame including a multiple data indication field more data in a frame control field, and the terminal STA uses The indication field more data informs the access point AP whether the terminal STA supports the use of a cluster acknowledgement frame Cluster ACK.

An access point device AP, where the access point includes:

a receiving unit, configured to receive a data frame sent by the terminal STA;

a cluster acknowledgement frame cluster ACK generating unit, configured to generate a cluster acknowledgement frame Cluster ACK according to whether the data frame sent by each terminal successfully receives the acknowledgement information ACK, where the acknowledgement frame Cluster ACK is used by the terminal STA to receive each Determining, by the terminal, whether the data frame that is sent is successfully received by the access point AP, where the cluster acknowledgement frame includes the acknowledgement information ACK and a terminal identifier corresponding to the acknowledgement frame;

And a sending unit, configured to send the cluster acknowledgement frame Cluster ACK to the terminal STA.

The access point device according to claim 14, wherein the cluster acknowledgement frame generated by the cluster acknowledgement frame cluster ACK generating unit further includes: frame control information Frame control, where the frame control information includes a sub The value of the subtype value is used to identify the frame as a cluster acknowledgement frame, and the value of the subtype value is from 0000-0110. The access point device according to claim 14 or 15, wherein the terminal is n terminals, and the cluster acknowledgement frame includes n pieces of acknowledgement information ACK;

The cluster acknowledgment frame generated by the cluster ACK generating unit further includes a cluster identifier Cluster ID for indicating a group identifier of a group to which the terminal corresponding to the acknowledgment information ACK in the data frame is sent;

Where l ≤ k ≤ n.

The access point device according to claim 14 or 15, wherein the terminal is n terminals, and the cluster acknowledgement frame includes n pieces of acknowledgement information ACK, and the cluster acknowledgement frame is And further comprising: the association identifier AID of the terminal is used as the terminal identifier of the terminal; the confirmation information ACK is recorded in the cluster confirmation frame, and the cluster confirmation frame body body portion generated by the cluster ACK generation unit includes two pieces of information. a group, n pieces of the AID and n pieces of the acknowledgment information ACK sequentially recorded, wherein the kth acknowledgment information ACK is an acknowledgment message ACK of the kth terminal in the group, 1 ≤ k ≤ n .

The access point according to claim 14 or 15, wherein the terminal is n terminals, and the cluster acknowledgement frame includes n pieces of acknowledgement information ACK.

The cluster confirmation frame generated by the cluster acknowledgment frame Cluster ACK generating unit further includes a cluster identifier Cluster ID for indicating a group identifier of a group to which the terminal corresponding to the acknowledgement information ACK in the data frame is sent;

The confirmation information ACK is described in the cluster confirmation frame body body portion, and includes n pieces of information confirmation information ACK.

The access point according to claim 14 or 15, wherein the terminal is n terminals, and the cluster acknowledgement frame includes n pieces of acknowledgement information ACK, and the cluster acknowledgement frame is further The association identifier AID including the terminal is used as the terminal identifier of the terminal; the confirmation information ACK is generated in the cluster acknowledgement frame Cluster ACK generation unit The cluster confirmation frame body body portion includes two information groups, n pieces of the AID sequentially recorded and n pieces of the confirmation information ACK sequentially recorded, wherein the kth confirmation information ACK is the first in the group The acknowledgement information ACK of k terminals, 1 ≤ k ≤ n.

The access point according to any one of claims 14-19, wherein the access point further comprises:

An information recording unit, configured to record the confirmation information ACK in the information list.

Then the cluster acknowledgement frame Cluster ACK generation unit reads the information in the information list to generate the cluster acknowledgement frame Cluster ACK. The access point according to any one of claims 14 to 20, wherein the cluster acknowledgment frame Cluster ACK generating unit is further configured to: if the terminal sends during the duration of the cluster acknowledgment frame The number of data frames is greater than 8, generating a cluster acknowledgement additional frame Cluster-added ACK, the cluster acknowledgement additional frame Cluster-added ACK including the address corresponding to the acknowledgement frame and the acknowledgement of the data frame after the eighth data frame Information ACK;

The sending unit is further configured to send the cluster acknowledgement additional frame Cluster-added ACK. .