WO2012031501A1 - Method, apparatus and system for sending initial frame, replying via response frame and reserving channel - Google Patents

Abstract

Disclosed are a method, apparatus and system for sending an initial frame, replying via a response frame and reserving a channel for use in MU-MIMO transmission. The method comprises: an initial frame is sent by an access point, the initial frame carrying response frame reply indication information, and the response frame reply indication information being used for indicating a station in an MU-MIMO packet replying via a response frame. The present invention solves the problem of each station being unable to determine whether reply via a response frame during MU-MIMO transmission. An access point can determine whether the channel reservation is successful from the response frame reply sent by a station, thereby improving the data transmission efficiency.

Description

TECHNICAL FIELD The present invention relates to a communication backbone or, in particular, to an initial frame transmission, a response frame reply, a channel reservation method, an apparatus, and a system, and is used for Multi-user multiple input multiple output MU-MIMO transmission. BACKGROUND OF THE INVENTION Wireless Local Area Networks (WLANs) are wireless network technologies that interconnect computer devices to form a network system that can communicate with each other and share resources. The essence of WLAN is that the communication cable is no longer used to connect the computer to the network, but is connected wirelessly, so that the construction of the network and the movement of the terminal are more flexible. IEEE802.il is one of the mainstream technologies of wireless LAN. This protocol mainly specifies the physical layer (PHY) and Media Access Control (MAC) layer specifications. With the development of mobile communication technology and the increasing demand for wireless networks, the physical layer specification has been developing towards higher and higher speeds. It has experienced 802.11 to 802.11b and then to 802. Ha/g, then 802.11η. Finally, the development of 802.1 lac. The actual physical technology has also evolved from direct sequence spread spectrum technology to OFDM (Orthogonal Frequency Division Multiplex) technology, and introduced multi-antenna technology in IEEE802.11n, introducing large bandwidth and in IEEE802.11ac. Multi-user multiple input multiple output (MU-MIMO) technology. In the current 802.11 system, the channel reservation is performed through the RTS (Request To Send)/CTS (Clear To Send) mechanism before the big block transmission is performed, so as to prevent multiple source sites from simultaneously A destination site transmits data, causing data collisions at the destination site, resulting in data loss. In this scenario, multiple source sites are hidden sites. In this mechanism, the TA field in the MAC frame header of the RTS frame indicates the MAC address of the transmitting station, the RA field indicates the MAC address of the receiving station, and the destination station replies to the CTS after receiving the RTS. The RA field is included in the MAC frame header of the CTS frame. The MAC address of the station that sends the RTS frame. After the station that sends the RTS frame receives the CTS containing its own MAC address, it considers that the transceiver link is successfully established and then performs data transmission. In addition, a Duration field is included in the MAC frame header of the RTS frame and the CTS frame to indicate the time when the data transmission occupies the channel, and the station that does not participate in the transmission and reception receives the RTS frame or the CTS frame according to the Duration field. The channel will not be preempted during the indicated time period, thus avoiding the interference to the receiving and receiving sites. Use The RTS/CTS mechanism can determine that the link between the transceiver stations is unblocked and solve the hidden terminal problem around the site to some extent. When MU-MIMO is introduced in the 802.11ac system, the source station and the multiple destination stations use one channel. Based on the current RTS/CTS mechanism, the MAC frame header of the RTS frame contains only the MAC address of one destination station, and cannot carry other The MAC address of the site, if hidden sites of active sites around these sites, then the problem of receiving data collisions caused by these hidden sites cannot be solved. It can be seen from the above that when an access point in a system using MU-MIMO simultaneously transmits a large data block to a plurality of stations under one MU-MIMO packet, channel reservation is required, and the MAC frame header of the RTS frame contains only one The MAC address of the destination site, the multiple sites under the MU-MIMO packet cannot determine whether it is necessary to reply to the CTS frame, which causes the channel reservation to fail, thereby affecting the data transmission efficiency. SUMMARY OF THE INVENTION A primary object of the present invention is to provide an initial frame transmission, a response frame reply, a channel reservation method, an apparatus, and a system for use in MU-MIMO transmission to solve the problem that a station in the MU-MIMO packet cannot determine whether to reply. The problem with the response frame. According to an aspect of the present invention, an initial frame sending method is provided for MU-MIMO transmission, the method includes: the access point sends an initial frame, where the initial frame carries a response frame reply indication message, and the response frame reply The indication information is used to indicate the site of the reply response frame in the MU-MIMO packet. Before the foregoing access point sends the initial frame, the method further includes: the access point notifying the MU-MIMO packet information to each station, where the packet information includes location sequence information of the site included in the MU-MIMO packet; response frame reply The indication information is information sequentially indicating whether each station in the MU-MIMO packet replies to the response frame according to the position order information. The initial frame also carries the primary site indication information. The above response frame reply indication information is the number of data streams of each site. After the foregoing access point sends the initial frame, the method further includes: after receiving the response frame of the site reply, the access point determines that the channel reservation with the station is successful. According to another aspect of the present invention, a response frame reply method is provided for MU-MIMO transmission, the method comprising: receiving, by a station, an initial frame from an access point, where the initial frame carries a response frame reply indication information The response frame reply indication information is used to indicate a reply response in the MU-MIMO packet a station of the frame; the station response frame reply indication information determines whether to reply the response frame; if yes, the station replies to the response frame, so that the access point determines that the channel reservation with the station is successful. Before the foregoing station receives the initial frame from the access point, the method further includes: the station receiving the MU-MIMO packet information from the access point, where the packet information includes location sequence information of the site included in the MU-MIMO packet; The response response frame includes: the site response frame reply indication information and the location sequence information determining a reply sequence of the response frame; wherein the response frame reply indication information sequentially indicates, according to the location order information, whether each site in the MU-MIMO packet responds with a response Frame information; the reply order refers to the order in which the station and other stations in the MU-MIMO packet reply to the response frame; the station replies to the response frame in a determined order. Determining, in response to the frame reply indication information and the location order information, the reply sequence of the response frame includes: the station determines, according to the response frame reply indication information, that each station in the MU-MIMO packet needs to reply to the response frame; the station determines the response frame The reply order is the order corresponding to the position order information. The above-mentioned site response frame reply indication information and location order information determine the reply sequence of the response frame, including: the site response frame reply indication information and the location sequence information determine whether the response frame is returned by itself; if yes, the site does not need to be in the location order information The site of the response response frame is deleted, and a new location order is obtained. The site determines the reply sequence of the response frame is the order corresponding to the new location order; if not, the response frame is not returned. The initial frame received by the foregoing station also carries the primary site indication information; the foregoing site determines the reply sequence of the response frame according to the response frame reply indication information and the location sequence information, including: the site determines whether it is the primary site according to the primary site indication information; if yes, Determining that the response frame needs to reply to the response frame according to the response frame reply indication information, determining that the reply sequence of the response frame is the first reply; if not, taking the first site in the location sequence information to the first place, and the other sites according to the location order information. The relative position is adjusted to obtain a new position order, and the station determines the reply order of the response frames to the order in which the new position order corresponds. The response frame reply indication information is the number of data streams of each station. The determining, by the station, the reply sequence of the response frame according to the response frame reply indication information and the location sequence information includes: the station: each of the MU-MIMO packets according to the size of the data stream The sites are sorted; the site determines the order in which the response frames are returned in the sorted order. The foregoing station sorting each site in the MU-MIMO packet according to the size of the data stream includes: determining the ordering between the multiple sites according to the location order information when the number of data flows of the multiple sites is equal. The present invention also provides a channel reservation method for MU-MIMO transmission, the method includes: the access point sends an initial frame, where the initial frame carries response frame reply indication information, and the response frame reply indication information is used to indicate a station that responds to the response frame in the MU-MIMO packet; after receiving the initial frame, the station in the MU-MIMO packet determines whether to reply the response frame according to the response frame reply indication information; if yes, the site responds to the response frame; the access point receives the site reply After the response frame, it is determined that the channel reservation with the station is successful. Before the foregoing access point sends the initial frame, the method further includes: the access point notifying the MU-MIMO packet information to each station, where the group information includes location sequence information of the site included in the MU-MIMO packet; The frame reply indication information is information sequentially indicating whether each station in the MU-MIMO packet responds to the response frame according to the position order information; the foregoing site reply response frame includes: the station determines the reply sequence of the response frame according to the response frame reply indication information and the position order information. The reply sequence refers to the order in which the station and other stations in the MU-MIMO packet reply to the response frame; the above-mentioned station replies to the response frame in a determined order. According to another aspect of the present invention, an access point is provided, including: an initial frame sending module, configured to send an initial frame, where the initial frame carries response frame reply indication information, and the response frame reply indication information is used to indicate multiple The user inputs multiple sites in the multi-output MU-MIMO packet to reply to the response frame. The foregoing access point further includes: a location sequence notification module, configured to notify the MU-MIMO packet information to each station, where the packet information includes location sequence information of a site included in the MU-MIMO packet; the initial frame sending module includes And a sequence corresponding unit, configured to sequentially indicate, according to the position order information, whether each station in the MU-MIMO packet returns a response frame according to the position sequence information. The access point further includes: a channel reservation determining module configured to: after receiving the response frame of the site reply, determine that the channel reservation with the station is successful. According to still another aspect of the present invention, a station is provided, including: a receiving module, configured to receive an initial frame from an access point, where the initial frame carries response frame reply indication information, and the response frame reply indication information is used to indicate a site for replying the response frame in the multi-user multiple-input multi-output MU-MIMO packet where the site is located; the response frame replying module is configured to determine whether to reply the response frame by using the response frame reply indication information; if yes, replying the response frame . The above-mentioned site further includes: a location sequence receiving module, configured to receive MU-MIMO packet information sent by the access point, where the packet information includes location sequence information of a site included in the MU-MIMO packet; the response frame reply module includes: determining a unit, configured to determine a reply response frame by the response frame reply indication information, and a reply order determining unit configured to determine, after the determining unit determines the reply response frame, Determining the reply sequence of the response frame according to the response frame reply indication information and the location order information; wherein, the reply order refers to the order of the site and the other sites in the MU-MIMO packet reply response frame; the reply unit is set to determine according to the reply order The order in which the unit determines the response frame. The reply sequence determining unit includes: a first determining subunit, configured to determine, in response to the frame reply indication information, that each station in the MU-MIMO packet needs to reply to the response frame, determining that the reply sequence of the response frame is the order corresponding to the position order information . The reply sequence determining unit includes: a second determining subunit, configured to determine whether the response frame is returned by the response frame reply indication information and the position order information; if yes, deleting the site in the position order information that does not need to reply to the response frame, In the new position order, the station determines that the response frame is in the order in which the new position order corresponds; if not, the response frame is not returned. The initial frame received by the receiving module further carries the primary site indication information. The reply sequence determining unit includes: a third determining subunit, configured to determine, according to the primary site indication information, whether it is the primary site; if yes, according to the response frame reply indication The information determines that it needs to reply to the response frame, and then determines the reply sequence of the response frame as the first reply; if not, the primary site in the location sequence information is taken out to the first place, and the other sites are adjusted according to the relative position in the positional order information. , to obtain a new position order, the station determines the reply sequence of the response frames in the order corresponding to the new position order. The response frame reply indication information in the initial frame received by the receiving module is the number of data streams of each station in the MU-MIMO packet; the reply sequence determining unit includes: a fourth determining subunit, which is set according to the size of the data stream Each station in the MU-MIMO packet is sorted, and the reply order of the response frames is determined to be the sorted order. The fourth determining subunit includes: a sorting subunit, configured to determine the ordering between the plurality of stations according to the position order information when the number of data streams of the plurality of stations is equal. According to still another aspect of the present invention, a channel reservation system is provided, comprising: the above access point and a station. That is, the access point includes: an initial frame sending module, configured to send an initial frame, where the initial frame carries response frame reply indication information, and the response frame reply indication information is used to indicate a response response in the multi-user multiple input multiple output MU-MIMO packet a station of the frame; the channel reservation determining module is configured to: after receiving the response frame of the site reply, determine that the channel reservation with the station is successful; the station comprises: a receiving module, configured to receive an initial frame from the access point; and a response frame reply module , configured to determine whether to reply to the response frame according to the response frame reply indication information; if yes, reply the response frame. The access point further includes: a location order notification module, configured to notify the MU-MIMO packet information to each station, where the packet information includes location sequence information of a site included in the MU-MIMO packet; the initial frame sending module includes The sequence corresponding unit is configured to sequentially indicate, according to the location order information, whether each station in the MU-MIMO packet responds to the response frame according to the location sequence information; the foregoing station further includes: a location sequence receiving module, configured to receive the transmission by the access point MU-MIMO packet information; the response frame replying module includes: a determining unit, configured to determine a reply response frame by the response frame reply indication information; and a reply sequence determining unit, configured to determine, after the determining unit determines the reply response frame, the response frame reply indication information and The location order information determines a reply order of the response frames; wherein the reply order refers to a sequence in which the station and other stations in the MU-MIMO packet reply to the response frame; and the reply unit is set to reply the response frame in the order determined by the reply order determining unit. The reply sequence determining unit includes: a first determining subunit, configured to determine, in response to the frame reply indication information, that each station in the MU-MIMO packet needs to reply to the response frame, determining that the reply sequence of the response frame is the order corresponding to the position order information . The reply sequence determining unit includes: a second determining subunit, configured to determine whether the response frame is returned by the response frame reply indication information and the position order information; if yes, deleting the site in the position order information that does not need to reply to the response frame, In the new position order, the station determines that the response frame is in the order in which the new position order corresponds; if not, the response frame is not returned. The initial frame sent by the initial frame sending module further carries the primary site indication information; the reply sequence determining unit includes: a third determining subunit, configured to determine, according to the primary site indication information, whether it is the primary site; if yes, according to the response frame The reply indication information determines that it needs to reply to the response frame, and determines that the reply sequence of the response frame is the first reply; if not, the primary site in the location sequence information is taken out to the first place, and the other sites are in the relative position in the position order information. Adjustments are made to arrive at a new positional order, and the site determines the order in which the response frames are returned in the order in which the new positional order corresponds. The response frame reply indication information in the initial frame sent by the initial frame sending module is the number of data streams of each station in the MU-MIMO packet; the reply sequence determining unit includes: a fourth determining subunit, which is set according to the number of data streams. The size sorts each site in the MU-MIMO packet, and determines the reply order of the response frames in the sorted order. The fourth determining subunit includes: a sorting subunit, configured to determine the ordering between the plurality of stations according to the position order information when the number of data streams of the plurality of stations is equal. According to the present invention, the access point carries the response frame reply indication information when transmitting the initial frame, so that the destination station can determine whether to reply the response frame according to the information, thereby completing the channel reservation, and solving the problem. In the MU-MIMO transmission, the access point does not provide the problem of whether the response frame indication needs to be returned, and enables the MU-MIMO to reply the response frame according to the response frame reply indication information, complete the channel reservation, and improve the data transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a flowchart of a channel reservation method in MU-MIMO transmission according to an embodiment of the present invention; FIG. 2 is a structural block diagram of an access point according to an embodiment of the present invention; FIG. 4 is a structural block diagram of a channel reservation system according to an embodiment of the present invention; FIG. 5 is a structural block diagram of a channel reservation system in MU-MIMO transmission according to Embodiment 5 of the present invention; It is a block diagram of a specific structure of a channel reservation system in MU-MIMO transmission according to Embodiment 5 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The embodiment of the present invention considers that the MU-MIMO transmission is a one-to-many or many-to-many transmission mode, and the access point (AP, Access Point) transmits data to multiple destination stations (STA, station) in order to ensure transmission. The data can be successfully received by the destination station. Before transmitting the data, the AP and the destination station implement channel reservation through the initial frame and the response frame, so that other devices do not preempt the channel during the period in which they subscribe to use the channel, and the The channel between the AP and the destination site is unblocked. Based on this, an embodiment of the present invention provides an initial frame transmission, a response frame reply, a channel reservation method, an apparatus, and a system, where the apparatus is an access point and a station, and is used in MU-MIMO transmission. The initial frame sending method includes: the access point sends an initial frame, where the initial frame carries the response frame reply indication information, and the response frame reply indication information is used to indicate the site of the reply response frame in the MU-MIMO packet. Preferably, before the sending of the initial frame by the access point, the method further includes: the access point notifying the MU-MIMO packet information to each station, where the packet information includes location sequence information of the site included in the MU-MIMO packet; Correspondingly, the response frame reply indication information is information sequentially indicating whether each station in the MU-MIMO packet replies to the response frame according to the position order information. Preferably, the initial frame also carries primary site indication information, such as the MAC address of the site. In a specific implementation, the response frame reply indication information may be the number of data streams of each site. After receiving the response frame of the site reply, the access point determines that the channel reservation with the site is successful. The foregoing response frame reply method is used in MU-MIMO transmission, and the method includes:

1) The station receives an initial frame from the access point, where the initial frame carries the response frame reply indication information, and the response frame reply indication information is used to indicate the site of the reply response frame in the MU-MIMO packet;

2) The station determines whether to reply the response frame according to the response frame reply indication information; if yes, the station replies to the response frame, so that the access point determines that the channel reservation with the station is successful. Otherwise the response frame will not be replied. Before the foregoing station receives the initial frame from the access point, the method further includes: the foregoing station receiving MU-MIMO packet information from the access point, where the packet information includes location sequence information of a site included in the MU-MIMO packet; The site reply response frame includes: the station determines a reply sequence of the response frame according to the response frame reply indication information and the location order information; wherein, the response frame reply indication information sequentially indicates each site in the MU-MIMO packet according to the location order information Whether to reply to the information of the response frame; the reply order refers to the order in which the station and other stations in the MU-MIMO packet reply to the response frame; the station replies to the response frame in a determined order. The station responds to the frame reply indication information and the location sequence information to determine the reply sequence of the response frame, and includes the following multiple manners. Manner 1: The station determines that each station in the MU-MIMO packet needs to reply to the response frame according to the response frame reply indication information; the reply order of the station determining response frame is the order corresponding to the location order information. Manner 2: The station determines whether it responds to the response frame according to the response frame reply indication information and the location sequence information; if yes, the site deletes the site in the location order information that does not need to reply to the response frame, and obtains In the new position order, the station determines that the response frame is in the order in which the new position order corresponds; if not, the response frame is not returned. Manner 3: When the initial frame received by the station further carries the primary site indication information, the determining, by the site, the response sequence of the response frame according to the response frame reply indication information and the location sequence information includes: the site primary site indication information determines whether it is the primary site; If yes, according to the response frame reply indication information, determining that it needs to reply to the response frame, determining that the reply sequence of the response frame is the first reply; if not, taking the first site in the location order information to the first place, and the other sites according to the location The relative position in the sequence information is adjusted to obtain a new position order, and the station determines that the response frame is returned in the order in which the new position order corresponds. Manner 4: When the response frame reply indication information is the number of data streams of each station, the station determines the reply sequence of the response frame according to the response frame reply indication information and the location order information, and includes: the station groups the MU-MIMO according to the size of the data flow. Each site is sorted; the site determines that the response frames are in the order in which they are sorted. When there are multiple sites with equal number of streams, the site can determine the ordering between multiple sites by location order information. The embodiment of the present invention further provides a channel reservation method, which is used in MU-MIMO transmission, and the method includes:

1) The access point sends an initial frame, where the initial frame carries the response frame reply indication information, the response frame reply indication information is used to indicate the site of the reply response frame in the MU-MIMO packet; 2) the site reception in the MU-MIMO packet After the initial frame, it is determined whether to reply the response frame according to the response frame reply indication information; if yes, the station replies to the response frame;

3) After receiving the response frame of the site reply, the access point determines that the channel reservation with the station is successful. Before the access point sends the initial frame, the method further includes: the access point notifying the MU-MIMO packet information to each station, where the packet information includes location sequence information of the site included in the MU-MIMO packet; correspondingly, the response frame The reply indication information is information indicating whether each station in the MU-MIMO packet responds to the response frame according to the position order information. The site reply response frame includes: a site response frame reply indication information and a position sequence information determining a reply sequence of the response frame; The reply order refers to the order in which the station responds to the response frames of other stations in the MU-MIMO packet; the station replies to the response frame in a determined order. The following is an example of implementation on an IEEE 802.11 system, where an initial frame uses an RTS frame in the system, a response frame uses a CTS frame in the system, and a response frame reply indication information multiplexes data flow indication information in the RTS frame. Those skilled in the art can also implement in other systems based on the implementation under the system. 1 is a flowchart of a channel reservation method in MU-MIMO transmission according to an embodiment of the present invention. The method includes the following steps: Step S102: An access point sends an RTS frame, where the RTS frame carries The response frame reply indication information. The response frame reply indication information is used to indicate the site of the response response frame in the MU-MIMO packet, and the response frame indication information of the embodiment is multiplexed in the data flow indication information; the data flow indication information may be added in the N of the RTS frame. _STS domain; step S 104, MU-MIMO packet station after receiving the RTS frame, the data stream based on the indication information to determine whether to reply CTS frame; step S 106, the site determines the reply CTS frame, a CTS frame to reply; After determining that the CTS frame is replied to, the station may determine the reply order by using the data flow indication information. The reply sequence refers to the order in which the station and the other stations in the MU-MIMO packet reply to the CTS frame; each station may be in the group identification information in the RTS frame, the receiving address RA domain indication information, and the data flow indication information field, etc. The combination of one or more indication information determines which specific MU-MIMO packet corresponds to the RTS frame. For specific implementation, refer to related technologies, for example: Each MU-MIMO packet has a packet number, and each MU- The MIMO packet is associated with the packet number, and the MU-MIMO packet corresponding to the RTS frame can be determined by using the packet number of the packet identification information in the RTS frame. Step S108: After receiving the CTS frame, the access point determines that the channel reservation with the above site is successful. There may be many sites in the actual network. The access point may divide the sites into multiple MU-MIMO packets according to the channel state information of each site. The number of sites in each MU-MIMO packet is N, and N is a variable. Can be set as needed. For less than N packets, you can add them with virtual sites. The access point sorts the sites in each group according to the location of the N sites, and obtains the order of the locations of each site under the group. Preferably, before the foregoing access point sends the RTS frame, the method further includes: the access point notifying the MU-MIMO packet information to each station, where the packet information includes location sequence information of the site included in the MU-MIMO packet; Correspondingly, the response frame indication information is information indicating, in order of the location order information, whether each station in the MU-MIMO packet returns a response frame. The information can be expressed in the following two manners. One is represented by the number of data streams. When the data stream corresponding to the station is not 0, the station needs to reply to the response frame, that is, the CTS frame in this embodiment. If the corresponding data stream is 0, the station does not need to reply to the response frame; the other is represented by a specific character, for example, "0" (or "N") means that no response response frame is required, with "1" ( Or ' Ύ ) ) indicates that a response frame needs to be replied, and the access point informs each site of the information in the order corresponding to the location of the site when transmitting the initial frame. For example: There are 4 sites in the current MU-MIMO packet, respectively For STA-1, STA-2, STA-3,

STA-4; The location order of these four sites is: STA-3, STA-1, STA-2, STA-4; and the number of data streams corresponding to STA-1, STA-2, STA-3, STA-4 For Nl, N2, N3, N4; then the data flow indication information may be: N3, Nl, N2, N4; for each station; * know the location order of each station under the group is STA-3, STA-1, STA -2, STA-4; Therefore, according to the correspondence between the data flow indication information and the position order, each station can determine STA-1, STA-2, STA-3, STA-4 after receiving the RTS frame. The corresponding data 3⁄4 turns are N 1 , N2, N3 , N4. If the access point requires one or more sites to reply to the CTS, the corresponding location in the N _STS i or the RTS frame indicates that the number of data streams of the current MU-MIMO transmission of the STA is not zero. Preferably, the determining the reply sequence of the CTS frame in step S104 comprises: the number of data streams of each station in the MU-MIMO packet in the above site and the above-mentioned location order determining the reply order of the CTS frame. The specific determining manner may be any one of the following manners: Mode 1: The station determines, according to the data flow indication information, that the number of data flows of each station in the MU-MIMO packet is not 0; the station determines that the reply sequence of the CTS frame is the above The order in which the position order corresponds. That is, the site with the relative position is preferentially replied to the CTS, and the site with the lower position is responsive to the CTS. Manner 2: The station determines whether the number of data streams of the site is 0 according to the data flow indication information and the foregoing location order; if yes, does not reply to the CTS; if not, the site deletes the site with the number of data flows of 0 in the location sequence, A new positional order, the site determines the order in which the CTS frames are replied to the order in which the new positional order corresponds. Manner 3: The RTS frame sent by the access point further carries the primary site indication information, where the indication information may specifically be the received MAC address information in the MAC frame header of the RTS frame; determining the reply sequence of the CTS frame may be as follows: The station determines whether it is the primary site according to the primary site indication information (the primary STA refers to the STA identified by the received MAC address information in the MAC frame header of the RTS frame); if yes, determines the number of data flows according to the data flow indication information. If 0, it is determined that the reply order of the CTS frame is the first reply; if not, the primary site in the position sequence is taken out to the first place, and the other stations are adjusted according to the relative position in the above positional order to obtain a new position. In order, the station determines the order in which the CTS frames are replied to the order in which the new position order corresponds. In this way, the primary station first replies to the CTS, and the remaining stations still reply to the CTS in the order of relative position in the MU-MIMO packet, that is, the relative priority CTS of the relative position, and the CTS after the relative position. Manner 4: The station sorts each station in the MU-MIMO packet according to the size of the above data stream; the station determines the order of reply of the CTS frame to be the sorted order. When there are multiple stations with the same number of data streams, the ordering between the multiple sites is determined according to the above positional order.该 In this way, each station can reply to the CTS in the ascending or descending order of the number of data streams of each station indicated by the N _STS field in the RTS frame; between stations having the same number of data streams, The order between them can be determined according to their relative positions within the group (i.e., the order of positions described above). In this embodiment, the access point carries the response frame reply indication information when the RTS frame is sent, so that the destination station can explicitly reply to the response frame, thereby completing the channel reservation, and solving the problem that the access point in the MU-MIMO transmission cannot indicate whether the station responds or not. The problem of frames improves the efficiency of data transmission. For the above four methods for determining the reply sequence of the CTS frame provided in this embodiment, the following is an example in which one AP and seven STAs in the network are used as an example, and seven STAs are respectively represented as STA-1 and STA-2. STA-3, STA-4, STA-5, STA-6, STA-7; Each MU-MIMO packet in the embodiment of the present invention is composed of 4 STAs, and MU-MIMO packets of less than 4 STAs are also considered It consists of 4 STAs. The insufficient part can be considered to have virtual STAs. The N _STS domain sequentially indicates the number of data streams of each STA according to the order of STAs in the MU-MIMO packets.

The AP divides the above seven STAs into a plurality of MU-MIMO packets according to the channel state information of each STA, and notifies the corresponding STAs of the packet information (that is, the above-mentioned location order). The following describes how the STA determines the reply order of CTS frames in the network environment by the following embodiments. Example 1 The MU-MIMO packets in this embodiment are: (STA-2, STA-1, STA-3, STA-4), and the APs will be in the order of location: STA-2, STA-1, STA-3, STA-4 Notify the STA in the packet. Before transmitting data to the MU-MIMO packet, the AP first sends 40 pairs of RTS frames of the MU-MIMO packet. In this embodiment, the MU-MIMO transmission is performed, STA-1 has N1 data streams, and STA-2 has N2 data streams, STA-3 has N3 data streams, STA-4 is described by N4 data streams as an example; where Nl, N2, N3, and N4 have the same value range, and are nine integers from 0 to 8. . In the above content, the RTS frame sent by the AP carries the data flow indication information, for example, the data flow indication information is added in its N _STS domain, and the indication information is as follows: The STA occupying the first position in the group in the packet is STA- The number of data streams of 2 is N2, indicating that the number of data streams of STAs occupying the second position in the group, that is, STA-1, is N1, indicating that the STAs occupying the third position in the group, that is, the STA-3 data stream. The number is N3, indicating that the number of data streams of STAs occupying the fourth position in the group, that is, STA-4, is N4. £: Nl=3, N2=l, N3=2, N4=2, and the receiving MAC address in the MAC frame header of the RTS frame is identified as the MAC address of STA-1. After receiving the above RTS frame, each STA performs the following operations:

After receiving the RTS frame, STA-1 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; Reusing the received packet information (ie, location order: STA-2, STA-1, STA-3, STA-4), knowing that you are in (STA-2, STA-1, STA-3, STA-4) The second position in the packet needs to reply to the CTS frame. Since it occupies the second position in the group, and the number of data streams of the STA occupying the first position in the group is not 0, a second reply CTS frame is needed.

After receiving the RTS frame, the STA-2 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; Reusing the received packet information, knowing that it is in the first position in the (STA-2, STA-1, STA-3, STA-4) packet, STA-2 needs to reply to the CTS frame, because it occupies the group The first position, thus requiring the first reply CTS frame. After receiving the RTS frame, the STA-3 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; Reusing the received packet information, and knowing that it is in the third position in the (STA-2, STA-1, STA-3, STA-4) packet, according to the method of the present invention, STA-3 needs to reply to the CTS frame. Since it occupies the third position in the group, and the number of data streams of the STAs occupying the first two positions in the group is not 0, a third reply CTS frame is required.

After receiving the RTS frame, the STA-4 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; Reusing the received packet information, and knowing that it is in the fourth position in the (STA-2, STA-1, STA-3, STA-4) packet, according to the method of the present invention, the STA-4 needs to reply to the CTS frame. Since it occupies the fourth position in the group, and the number of data streams of STAs occupying the first three positions in the group is not 0, a fourth reply CTS frame is required. Therefore, in this embodiment, the STAs that finally reply to the CTS frame and their order are as follows: the first reply CTS frame is STA-2; the second reply CTS frame is STA-1; the third reply CTS frame is STA-3; The fourth reply to the CTS frame is STA-4.

After receiving the CTS frame, the AP determines that the channel reservation is successful, and transmits data within the packet during the channel reservation. After receiving the RTS frame, the STA in this embodiment determines that the number of data streams of each STA is not 0, and then returns the CTS frame according to the position sequence in the packet in which the STA is located, thereby completing channel reservation, thereby improving data transmission efficiency. Example 2 The MU-MIMO packets in this embodiment are: (STA-2, STA-1, STA-3, STA-4), and the APs will be in the order of location: STA-2, STA-1, STA-3, STA-4 Notify the STA in the packet. Before transmitting data to the MU-MIMO packet, the AP first sends 40 pairs of RTS frames of the MU-MIMO packet. In this embodiment, the MU-MIMO transmission is performed, STA-1 has N1 data streams, and STA-2 has N2 data streams, STA-3 has N3 data streams, STA-4 is described by N4 data streams as an example; where Nl, N2, N3, and N4 have the same value range, and are nine integers from 0 to 8. . In the above content, the RTS frame sent by the AP carries the data flow indication information, for example, the data flow indication information is added in its N _STS domain, and the indication information is as follows: The STA occupying the first position in the group in the packet is STA- The number of data streams of 2 is N2, indicating that the number of data streams of STAs occupying the second position in the group, that is, STA-1, is N1, indicating that the STAs occupying the third position in the group, that is, the STA-3 data stream. The number is N3, indicating that the number of data streams of STAs occupying the fourth position in the group, that is, STA-4, is N4. £: N1=0, N2=3, N3=2, N4=0, and the receiving MAC address in the MAC header of the RTS frame is identified as the MAC address of STA-1. After each STA receives the RTS frame, the following operations are performed:

After receiving the RTS frame, STA-1 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 3, the number of data streams of the STA occupying the second position in the group is 0, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 0; Reusing the received packet information, and knowing that it is in the second position in the (STA-1, STA-2, STA-3, STA-4) packet, because the number of data streams is 0, it does not reply to the CTS frame. .

After receiving the RTS frame, the STA-2 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 3, the number of data streams of the STA occupying the second position in the group is 0, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 0; Reusing the received packet information, knowing that it is in the first position in the (STA-1, STA-2, STA-3, STA-4) packet, and STA-2 needs to reply to the CTS, because it occupies the first in the group. Location, so STA-2 first responded to CTS.

After receiving the RTS frame, the STA-3 detects the N _STS field of the RTS frame, and the obtained information is: the data flow of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs. The number is 3, the number of data streams of the STA occupying the second position in the group is 0, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 0; Reusing the received packet information, knowing that it is in the (STA-1, STA-2, STA-3, STA-4) packet, and occupying the third position in the group itself, STA-3 needs to reply The CTS frame, since STA-1 occupying the second position has no data in this MU-MIMO transmission, STA-3 replies to the CTS frame second.

After receiving the RTS frame, the STA-4 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 3, the number of data streams of the STA occupying the second position in the group is 0, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 0; Reusing the received packet information, and knowing that it is in the fourth position in the (STA-1, STA-2, STA-3, STA-4) packet, because the number of data streams is 0, STA-4 does not need Reply to the CTS frame. Thus, in this embodiment, the STAs that finally reply to the CTS frame and their order are as follows: the first reply CTS frame is STA-2; the second reply CTS frame is STA-3. After receiving the CTS frame, the AP determines that the channel reservation is successful, and transmits data within the packet during the channel reservation. After receiving the RTS frame, the STA in this embodiment determines that the number of data streams of the STA is 0, and then adjusts the position order in the group in which the STA is located, and then returns the CTS frame according to the new position order, thereby completing the channel reservation, thereby improving the channel reservation. Data transmission efficiency. Embodiment 3 The MU-MIMO packet in this embodiment is: (STA-2, STA-1, STA-3, STA-4), and the AP will be in the order of location: STA-2, STA-1, STA-3, STA-4 notifies the STA in the packet. Before transmitting data to the MU-MIMO packet, the AP first sends 40 pairs of RTS frames of the MU-MIMO packet. In this embodiment, the MU-MIMO transmission is performed, STA-1 has N1 data streams, and STA-2 has N2 data streams, STA-3 has N3 data streams, STA-4 is described by N4 data streams as an example; where Nl, N2, N3, and N4 have the same value range, and are nine integers from 0 to 8. . In the above content, the RTS frame sent by the AP carries the data flow indication information, for example, the data flow indication information is added in its N _STS domain, and the indication information is as follows: The first position in the group is occupied by the packet. The number of data streams of the STA, that is, STA-2 is N2, indicating that the number of data streams of the STA occupying the second position in the group, that is, STA-1, is N1, indicating that the STA occupying the third position in the group, that is, STA- The number of data streams of 3 is N3, indicating that the number of data streams of STAs occupying the fourth position in the group, that is, STA-4, is N4. It is determined that: Nl=3, N2=l, N3=2, N4=2, and the receiving MAC address in the MAC frame header of the RTS frame is identified as the MAC address of STA-1, and the STA-1 of the MAC address is in the present In the embodiment, it is the primary site. After each STA receives the RTS frame, the following operations are performed:

After receiving the RTS frame, STA-1 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; Parsing the MAC address information indicated by the receiving address in the MAC frame header of the RTS frame, the STA identified by the MAC address information is STA-1, that is, the primary STA is STA-1, and then using the received packet information, it is known that it is ( STA-2, STA-1, STA-3, STA-4) The second position in the packet needs to reply to the CTS frame. Since it is the primary STA itself, although it occupies the second position in the group, it needs the first reply. CTS frame.

After receiving the RTS frame, the STA-2 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; Parsing the MAC address information indicated by the receiving address in the MAC frame header of the RTS frame, the STA identified by the MAC address information is STA-1, that is, the primary STA is STA-1, and then using the received packet information, it is known that it is ( STA-2, STA-1, STA-3, STA-4) The first position in the packet, according to the method of the present invention, STA-2 needs to reply to the CTS frame, since the number of data streams of the primary STA is not 0, the first One replies to the CTS, so STA-2 wants to reply to the CTS frame for the second time.

After receiving the RTS frame, the STA-3 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; The MAC address information indicated by the receiving address in the MAC frame header of the RTS frame is parsed, and the STA identified by the MAC address information is STA-1, that is, the primary STA is STA-1, and the received packet information is used to learn the location. In the third position in the (STA-2, STA-1, STA-3, STA-4) packet, in accordance with the method of the present invention, STA-3 needs to reply to the CTS frame because it occupies the third position in the group, and The STAs occupying the first two positions in the group do not have a data stream number of 0, and the primary STA is also in front of itself, thus requiring a third reply CTS frame. After receiving the RTS frame, the STA-4 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; Parsing the MAC address information indicated by the receiving address in the MAC frame header of the RTS frame, the STA identified by the MAC address information is STA-1, that is, the primary STA is STA-1, and then using the received packet information, it is known that it is ( STA-2, STA-1, STA-3, STA-4) The fourth position in the packet, STA-4 needs to reply to the CTS frame, because it occupies the fourth position in the group and occupies the first three positions in the group. The number of data streams of the STA is not 0, and the primary STA is also in front of itself, thus requiring a fourth reply CTS frame. Therefore, in this embodiment, the STAs that finally reply to the CTS frame and their order are as follows: the first reply CTS frame is STA-1; the second reply CTS frame is STA-2; the third reply CTS frame is STA-3; The fourth reply to the CTS frame is STA-4.

After receiving the CTS frame, the AP determines that the channel reservation is successful, and transmits data within the packet during the channel reservation. After receiving the RTS frame, the STA in this embodiment determines that the number of data streams of each STA is not 0, and the primary station is specified in the RTS frame, and the order of each station is adjusted according to the order of the primary stations in the group. The new position order is obtained, and the CTS frame is returned in the new position order, thereby completing the channel reservation, thereby improving the data transmission efficiency. The number of data streams in the above embodiment may also be replaced with a specific indicator, for example: Replace the number of data streams that are not 0 with "Y", and replace the number of data streams that are 0 with "N". The other steps remain the same. Example 4 The MU-MIMO packets in this embodiment are: (STA-2, STA-1, STA-3, STA-4), and the APs will be in the order of location: STA-2, STA-1, STA-3, STA-4 Notify the STA in the packet. Before transmitting data to the MU-MIMO packet, the AP first sends 40 pairs of RTS frames of the MU-MIMO packet. In this embodiment, the MU-MIMO transmission is performed, STA-1 has N1 data streams, and STA-2 has N2 data streams, STA-3 has N3 data streams, STA-4 is described by N4 data streams as an example; where Nl, N2, N3, and N4 have the same value range, and are nine integers from 0 to 8. . In the above content, the RTS frame sent by the AP carries the data flow indication information, for example, the data flow indication information is added in its N _STS domain, and the indication information is as follows: The STA occupying the first position in the group in the packet is STA- The number of data streams of 2 is N2, indicating that the number of data streams of STAs occupying the second position in the group, that is, STA-1, is N1, indicating that the STAs occupying the third position in the group, that is, the STA-3 data stream. The number is N3, indicating that the number of data streams of STAs occupying the fourth position in the group, that is, STA-4, is N4. £: Nl=3, N2=l, N3=2, N4=2, and the receiving MAC address in the MAC frame header of the RTS frame is identified as the MAC address of STA-1. After each STA receives the RTS frame, the following operations are performed:

After receiving the RTS frame, STA-1 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; Reusing the received packet information, knowing that it is in the second position in the (STA-2, STA-1, STA-3, STA-4) packet, and needs to reply to the CTS, because the number of data streams belonging to itself is Nl= 3, the most in the group, so the first reply CTS frame is needed.

After receiving the RTS frame, the STA-2 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; Reusing the received packet information, it is known that it is in the first position in the (STA-2, STA-1, STA-3, STA-4) packet, STA-2 needs to reply to the CTS frame, because it belongs to its own data. The number of streams N2 = l is the smallest within the group, thus requiring a fourth reply CTS frame. After receiving the RTS frame, the STA-3 detects the N _STS field of the RTS frame, and obtains the following information: The number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; Reusing the received packet information, it is known that it is in the third position in the (STA-2, STA-1, STA-3, STA-4) packet, STA-3 needs to reply to the CTS frame, because it belongs to its own data. The number of streams is N3=2. There are one STAs in the group that have more data streams than the ones in the group. There are one STAs with the same number of streams. The number of STAs in the group is the same as the number of STAs with the same number of streams. The position is higher, so a second reply CTS frame is required. After receiving the RTS frame, the STA-4 detects the N _STS field of the RTS frame, and obtains the information that the number of data streams of the STA occupying the first position in the group in the packet to which the MU-MIMO data to be transmitted belongs is 1 . The number of data streams of the STA occupying the second position in the group is 3, the number of data streams of the STA occupying the third position in the group is 2, and the number of data streams of the STA occupying the fourth position in the group is 2; Reusing the received packet information, knowing that it is in the fourth position in the (STA-2, STA-1, STA-3, STA-4) packet, STA-4 needs to reply to the CTS frame, because it belongs to its own data. The number of streams is N4=2. There are one STAs in the group that have more data streams than their own. There are one STAs with the same number of data streams. The STAs in the group are the same as the STAs with the same number of data streams. The position within the group is further back, thus requiring a third reply CTS frame. Therefore, in this embodiment, the STAs that finally reply to the CTS frame and their order are as follows: the first reply CTS frame is STA-1; the second reply CTS frame is STA-3; the third reply CTS frame is STA-4; The fourth reply to the CTS frame is STA-2.

After receiving the CTS frame, the AP determines that the channel reservation is successful, and transmits data within the packet during the channel reservation. After receiving the RTS frame, the STA in this embodiment determines that the number of data streams of each STA is not 0, and determines the order of replying the CTS frame according to the size of the data stream in the packet, thereby completing the channel reservation and improving the data. Transmission efficiency. The embodiment of the present invention further provides an access point, where the access point includes: an initial frame sending module, configured to send an initial frame, where the initial frame carries a response frame reply indication information, and the response frame reply indication information is used to indicate The site in the MU-MIMO packet that replies to the response frame. As shown in FIG. 2, the access point includes: a location sequence notification module 22, configured to notify MU-MIMO packet information to each station, where the packet information includes location sequence information of a site included in the MU-MIMO packet; The initial frame sending module 24 includes: a sequence corresponding unit 242, configured to sequentially indicate, in order of the location information, whether each station in the MU-MIMO packet responds to the response frame according to the location information; and the sending unit 244 is configured to send the initial frame, where The initial frame carries the response frame reply indication information in the sequence correspondence unit 242 described above. Preferably, the access point further includes: a channel reservation determining module, configured to determine that the channel reservation with the station is successful after receiving the response frame of the site reply. The access point in this embodiment solves the problem that the station in the MU-MIMO packet cannot respond to the response frame by transmitting the initial frame carrying the response frame reply indication information, thereby providing a guarantee for channel reservation success, thereby improving data. Transmission speed. The embodiment of the present invention further provides a station. As shown in FIG. 3, the station includes: a receiving module 32, configured to receive an initial frame from an access point, where the initial frame carries a response frame reply indication message, and the response frame The reply indication information is used to indicate the site of the response response frame in the multi-user multiple input multi-output MU-MIMO packet where the site is located; the response frame reply module 34 is connected to the receiving module 32, and is configured to determine whether to respond according to the response frame reply indication information. Frame; if yes, reply to the response frame. The site further includes: a location sequence receiving module, configured to receive MU-MIMO packet information sent by the access point, where the packet information includes location sequence information of a site included in the MU-MIMO packet; and the response frame reply module 34 includes: a unit, configured to determine a reply response frame by responding to the frame reply indication information; a reply order determining unit, configured to determine, after the determining unit determines the reply response frame, the reply frame reply indication information and the position order information determine a reply sequence of the response frame; wherein, the reply order refers to the site and the other site reply response frame in the MU-MIMO packet The order of reply; the reply unit is set to reply the response frame in the order determined by the reply order determining unit. Preferably, the reply sequence determining unit may include one of the following: a first determining subunit, configured to determine, according to the response frame reply indication information, that each station in the MU-MIMO packet needs to reply to the response frame, and determine a reply sequence of the response frame. The order corresponding to the position order information. a second determining subunit, configured to determine whether the response frame is returned by the response frame reply indication information and the location order information; if yes, delete the site in the location order information that does not need to reply to the response frame, to obtain a new location order, and determine the location The reply sequence of the response frame is the order corresponding to the new position order; if the answer is no, the response frame is not returned. If the initial frame received by the receiving module 32 further carries the primary site indication information, the foregoing reply sequence determining unit may further include: a third determining subunit, configured to determine, according to the primary site indication information, whether it is the primary site; if yes, according to the response The frame reply indication information determines that it needs to reply to the response frame, and then determines that the reply sequence of the response frame is the first reply; if not, the primary site in the location sequence information is taken out to the first place, and the other sites are compared according to the positional order information. The position is adjusted to obtain a new position order, and the station determines that the response frame is returned in the order in which the new position order corresponds. If the response frame reply indication information in the initial frame received by the receiving module 32 is the number of data streams of each station in the MU-MIMO packet, the reply sequence determining unit may further include: a fourth determining subunit, configured to follow the number of data streams The size of each of the MU-MIMO packets is sorted, and the order of reply of the response frames is determined to be the sorted order. Preferably, the fourth determining subunit comprises: a sorting subunit, configured to determine the ordering between the plurality of stations according to the location order information when the number of data streams of the plurality of stations is equal. The station in this embodiment solves the problem that the response frame cannot be determined in the MU-MIMO transmission by completing the channel reservation with the access point by replying the response frame according to the indication in the response frame reply indication information. This increases the speed at which data is transmitted. As shown in FIG. 4, an embodiment of the present invention further provides a channel reservation system for MU-MIMO transmission, where the system includes: an access point 20 and a station 30. The access point 20 and the station 30 can be implemented in the manner of the foregoing embodiment. For example, the access point 20 includes: an initial frame sending module, configured to send an initial frame, where the initial frame carries a response frame reply indication information, The response frame reply indication information is used to indicate a site for replying the response frame in the multi-user multiple input multi-output MU-MIMO packet; the channel reservation determining module is configured to: after receiving the response frame of the site reply, determine that the channel reservation with the station is successful; The station 30 includes: a receiving module configured to receive an initial frame from the access point 20; a response frame replying module configured to determine whether to reply to the response frame according to the response frame reply indication information; and if so, to reply to the response frame. Preferably, the access point 20 further includes: a location sequence notification module, configured to notify the MU-MIMO packet information to each station, where the packet information includes location sequence information of a site included in the MU-MIMO packet; initial frame transmission The module includes: a sequence corresponding unit, configured to sequentially indicate, according to the position order information, whether each station in the MU-MIMO packet responds to the response frame according to the position sequence information. The site 30 further includes: a location sequence receiving module, configured to receive the MU-MIMO packet information sent by the access point; the response frame replying module includes: a determining unit, configured to determine a reply response frame by the response frame reply indication information; After the determining unit determines the reply response frame, determining a reply sequence of the response frame according to the response frame reply indication information and the position order information; wherein, the reply order refers to a sequence of the response frames of the station and other stations in the MU-MIMO packet; a reply unit, configured to reply to the response frame according to the order determined by the reply order determining unit; the reply order determining unit includes: a first determining subunit, configured to determine, according to the response frame reply indication information, that each station in the MU-MIMO packet needs to respond with a response The frame determines the order in which the response frames are returned in the order in which the positional order information corresponds. The reply order determining unit includes: a second determining subunit, configured to determine whether the response frame is returned by the response frame reply indication information and the location order information; if yes, delete the site in the location order information that does not need to reply to the response frame, to obtain a new location order, and determine the location The reply sequence of the response frame is the order corresponding to the new position order; if the answer is no, the response frame is not returned. When the initial frame sent by the initial frame sending module further carries the primary site indication information, the reply sequence determining unit includes: a third determining subunit, configured to determine, according to the primary site indication information, whether it is the primary site; if yes, according to the response frame The reply indication information determines that it needs to reply to the response frame, and determines that the reply sequence of the response frame is the first reply; if not, the primary site in the location sequence information is taken out to the first place, and the other sites are in the relative position in the position order information. Adjustments are made to arrive at a new positional order, and the site determines the order in which the response frames are returned in the order in which the new positional order corresponds. When the response frame reply indication information in the initial frame sent by the initial frame sending module is the number of data streams of each station in the MU-MIMO packet; the reply sequence determining unit includes: a fourth determining subunit, which is set according to the number of data streams The size of each station in the MU-MIMO packet is sequenced, and the order of reply of the response frames is determined to be the order of the 4th order. The fourth determining subunit includes: a sorting subunit, configured to determine the ordering between the plurality of stations according to the position order information when the number of data streams of the plurality of stations is equal. The following is an example of implementation on an IEEE 802.11 system, where an initial frame uses an RTS frame in the system, a response frame uses a CTS frame in the system, and a response frame reply indication information multiplexes data flow indication information in the RTS frame. Those skilled in the art can also implement in other systems based on the implementation under the system. Embodiment 5 FIG. 5 is a structural block diagram of a channel reservation system in MU-MIMO transmission according to an embodiment of the present invention. The system includes: an access point 20 and a plurality of stations connected to the access point 20, this embodiment The multiple sites in the site are the site 30, the site 32, and the site 34, and the three sites belong to the same MU-MIMO packet and have the same function. This embodiment is only described by using the site 30 as an example. The access point 20 is configured to send an RTS frame, and after receiving the CTS frame replied by the station 30 in the MU-MIMO packet, determine that the channel reservation with the station is successful; wherein the RTS frame carries the data flow indication information; The station 30 is configured to: after receiving the RTS frame, determine whether to reply to the CTS frame according to the data flow indication information, and if yes, reply to the CTS frame; and after determining to reply to the CTS frame, determine the reply sequence according to the data flow indication information. The reply sequence refers to the order in which the station 30 and other stations in the MU-MIMO packet reply to the CTS frame. In this embodiment, the access point 20 carries the data flow indication information when transmitting the RTS frame, so that the station 30 can determine the reply sequence of the CTS according to the information, thereby completing the channel reservation, and solving the problem of channel reservation failure in the MU-MIMO transmission. Improve data transfer efficiency. As shown in FIG. 6, the access point 20 includes: a location information notification module 202, configured to notify MU-MIMO packet information to each station, where the packet information includes location sequence information of sites included in the MU-MIMO packet; The data flow indication information in the RTS frame sent by the access point sequentially indicates the number of data streams of each station in the MU-MIMO packet according to the location order information. The station 30 includes: a reply order determining module 302 configured to determine the reply order of the CTS frames by the number of data streams and the position order information of each station in the MU-MIMO packet. When the site 30 is specifically configured to determine the reply sequence of the CTS frame, the method may be implemented in multiple manners, for example: Method 1: The site 30 includes: a first data stream number determining module, configured to determine, according to the data stream indication information, each MU-MIMO packet The number of data streams of each station is not 0; the first reply order determining module is configured to determine that the reply order of the CTS frames is the order corresponding to the above position order information. Manner 2: The station 30 includes: a second data stream number determining module, configured to determine, according to the data stream indication information and the location sequence information, whether the number of data streams is 0; the second reply sequence determining module is set to the second data stream If the result determined by the number determining module is yes, the CTS is not returned; if not, the site with the number of data streams in the above positional order information is deleted, and a new position order is obtained, and the reply order of the CTS frame is determined to be a new positional order. Corresponding order. Manner 3: The RTS frame sent by the access point 20 also carries the primary site indication information, for example: the received MAC address identifier in the MAC frame header of the RTS frame; the site 30 includes: a primary site determining module, configured to indicate information according to the primary site Determining whether it is the primary site; the third reply sequence determining module is set as the primary site determining module, if the determination result is yes, according to the data flow indication information, determining that the number of data streams is not 0, determining the reply sequence of the CTS frame is first If there is no, take the first site in the above positional order information and put it in the first place, and follow the other sites in the above position. The relative position in the sequence information is adjusted to obtain a new position order, and the order of reply of the CTS frame is determined to be the order corresponding to the new position order. Manner 4: The station 30 includes: a sorting module, configured to sort each station in the MU-MIMO packet according to the size of the data stream; and a fourth reply order determining module, configured to determine that the reply order of the CTS frame is sorted by the sorting module The order after. Considering that the number of data streams of different sites may be equal, in this manner, the sorting module further includes: a sorting unit, configured to determine multiple sites according to the above-mentioned location order information when the number of data streams of multiple sites is equal Sort between. The access point of the embodiment of the present invention can determine the reply sequence of the CTS by multiple sites in one MU-MIMO packet by transmitting the RTS once, and complete the channel reservation operation according to the sequence, thereby improving the data transmission efficiency and success rate. From the above description, it can be seen that the present invention achieves the following technical effects: The above embodiment determines the order in which each station replies to the CTS by performing MU-MIMO grouping on multiple sites, and can complete the channel of the packet as soon as possible. The appointment prevents the hidden site from being disturbed and ensures that the access point successfully transmits data. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim An initial frame transmission method for multi-user multiple input multiple output MU-MIMO transmission, including:  The access point sends an initial frame, where the initial frame carries response frame reply indication information, and the response frame reply indication information is used to indicate a station that responds to the response frame in the MU-MIMO packet. 2. The method according to claim 1, wherein  Before the access point sends the initial frame, the method further includes: the access point notifying the MU-MIMO packet information to each station, where the packet information includes a location of a site included in the MU-MIMO packet Order information  The response frame reply indication information is information sequentially indicating whether each station in the MU-MIMO packet returns a response frame according to the location order information. 3. The method according to claim 1, wherein the initial frame further carries primary site indication information. 4. The method according to claim 1, wherein the response frame reply indication information is a number of data streams of each site. The method according to any one of claims 1-4, wherein, after the access point sends the initial frame, the method further includes:  After receiving the response frame replied by the station, the access point determines that the channel reservation with the station is successful. 6. A response frame reply method for multi-user multiple input multiple output MU-MIMO transmission, including: Receiving, by the station, an initial frame from the access point, where the initial frame carries response frame reply indication information, where the response frame reply indication information is used to indicate a site in the MU-MIMO packet that responds to the response frame; The station determines whether to reply to the response frame by the response frame reply indication information; if yes, the station replies to the response frame, so that the access point determines that the channel reservation with the station is successful. 7. The method according to claim 6, wherein  Before the station receives the initial frame from the access point, the method further includes: the station receiving MU-MIMO packet information from the access point, where the packet information includes a site included in the MU-MIMO packet Location order information;  Responding to the response frame by the station includes: the response frame reply indication information of the site and the location sequence information determining a reply sequence of the response frame; wherein the response frame reply indication information is according to the location sequence information Determining, in sequence, information of whether each station in the MU-MIMO packet replies with a response frame; the reply sequence refers to a sequence in which the station and other stations in the MU-MIMO packet reply to a response frame; The order is replied to the response frame. The method according to claim 7, wherein the determining, by the station, the reply sequence of the response frame according to the response frame reply indication information and the location sequence information comprises:  Determining, by the station, according to the response frame reply indication information, that each station in the MU-MIMO packet needs to reply to a response frame;  The station determines that the reply sequence of the response frame is the order corresponding to the location order information. 9. The method according to claim 7, wherein the determining, by the station, the reply sequence of the response frame according to the response frame reply indication information and the location order information comprises:  Determining, by the station, whether to reply the response frame according to the response frame reply indication information and the location sequence information;  If yes, the station deletes the site in the location sequence information that does not need to reply to the response frame, and obtains a new location sequence, where the site determines that the response sequence of the response frame is the order corresponding to the new location sequence;  If the result is no, the response frame will not be returned. 10. The method according to claim 7, wherein the initial frame received by the station further carries primary site indication information; Determining, by the station, the reply sequence of the response frame according to the response frame reply indication information and the location sequence information includes:  Determining, by the first station, whether the device is the primary site according to the primary site indication information; if yes, determining, according to the response frame reply indication information, that the response frame needs to be returned, determining that the response sequence of the response frame is the first reply;  If not, the primary site in the location sequence information is taken out to the first place, and the other sites are adjusted according to the relative position in the location sequence information to obtain a new location order, and the site determines the response frame. The reply order is the order in which the new position order corresponds. 11. The method according to claim 7, wherein the response frame reply indication information is a data flow number of each site;  Determining, by the station, the reply sequence of the response frame according to the response frame reply indication information and the location order information includes: the station, each site in the MU-MIMO packet according to the size of the data flow number Sorting; the station determines that the reply sequence of the response frame is the order after the sequence. 12. The method according to claim 11, wherein the sorting, by the station, each site in the MU-MIMO packet according to the size of the number of data streams includes:  When the number of data streams of the plurality of stations is equal, the ordering between the plurality of stations is determined according to the position order information. 13. A channel reservation method for multi-user multiple input multiple output MU-MIMO transmission, the method comprising:  The access point sends an initial frame, where the initial frame carries the response frame reply indication information, where the response frame reply indication information is used to indicate the station in the MU-MIMO packet of the station that responds to the response frame in the MU-MIMO packet. After receiving the initial frame, determining whether to reply the response frame according to the response frame reply indication information; if yes, the station replies to the response frame; After receiving the response frame replied by the station, the access point determines that the channel reservation with the station is successful. 14. The method according to claim 13, wherein  Before the access point sends the initial frame, the method further includes: the access point notifying the MU-MIMO packet information to each station, where the packet information includes a location of a site included in the MU-MIMO packet Order information  The response frame reply indication information is information sequentially indicating, according to the location order information, whether each station in the MU-MIMO packet returns a response frame;  Responding to the response frame by the station includes: the responding frame reply indication information and the location order information determining the reply sequence of the response frame; wherein the reply sequence refers to the station and the MU-MIMO The other stations in the packet reply to the order of the response frames; the station replies to the response frame in a determined order. 15. An access point, including:  The initial frame sending module is configured to send an initial frame, where the initial frame carries response frame reply indication information, and the response frame reply indication information is used to indicate a reply response frame in the multi-user multiple input multiple output MU-MIMO packet Site. The access point according to claim 15, wherein the access point further comprises: a location sequence notification module, configured to notify MU-MIMO packet information to each site, where the packet information includes MU - location order information of sites included in the MIMO packet;  The initial frame sending module includes:  And the sequence corresponding unit is configured to sequentially indicate, according to the location order information, whether the response frame reply indication information is returned by each of the MU-MIMO packets. The access point according to claim 15 or 16, wherein the access point further comprises: a channel reservation determining module, configured to: after receiving the response frame of the site reply, determine the relationship with the site The channel reservation was successful. 18. A type of site, including: The receiving module is configured to receive an initial frame from the access point, where the initial frame carries the response frame reply indication information, where the response frame reply indication information is used to indicate the multi-user multiple input multiple output MU where the site is located a station that replies to the response frame in the MIMO packet; a response frame reply module configured to determine whether to reply the response frame according to the response frame reply indication information; and if so, to reply to the response frame. The station according to claim 18, wherein the station further comprises: a location sequence receiving module, configured to receive MU-MIMO packet information sent by the access point, where the packet information includes MU-MIMO The positional order information of the sites contained in the group;  The response frame reply module includes:  Determining a unit, configured to determine, by the response frame reply indication information, to reply to the response frame;  a reply order determining unit, configured to determine, after the determining unit determines to reply to the response frame, the reply sequence of the response frame according to the response frame reply indication information and the position order information; wherein the reply sequence refers to Determining the order of the response frames with the other stations in the MU-MIMO packet;  The reply unit is arranged to reply the response frame in the order determined by the reply order determining unit. The station according to claim 19, wherein the reply order determining unit comprises: a first determining subunit, configured to determine, according to the response frame reply indication information, that each site in the MU-MIMO packet is required In response to the response frame, it is determined that the reply sequence of the response frame is the order corresponding to the position order information. The station according to claim 19, wherein the reply order determining unit comprises: a second determining subunit, configured to determine whether to reply a response frame according to the response frame reply indication information and the location order information; If yes, the site in the location sequence information that does not need to reply to the response frame is deleted, and a new location order is obtained, where the site determines that the response sequence of the response frame is the order corresponding to the new location order; if not, does not reply Response frame. The station according to claim 19, wherein the initial frame received by the receiving module further carries primary site indication information;  The reply order determining unit includes: a third determining subunit, configured to determine, according to the primary site indication information, whether it is a primary site; if yes, determining, according to the response frame reply indication information, that the response frame needs to be returned, determining that the response sequence of the response frame is the first reply If not, the primary site in the location sequence information is taken out to the first position, and the other sites are adjusted according to the relative position in the location sequence information to obtain a new location sequence, and the site determines the response frame. The reply order is the order in which the new position order corresponds. The station according to claim 19, wherein the response frame reply indication information in the initial frame received by the receiving module is the number of data streams of each station in the MU-MIMO packet; Includes:  And a fourth determining subunit, configured to perform, in accordance with the size of the data stream, each station in the MU-MIMO packet, and determine a reply order of the response frame as the sorted order. 24. The station according to claim 20, wherein the fourth determining subunit comprises:  The sorting subunit is set to determine the ordering between the plurality of stations according to the position order information when the number of data streams of the plurality of stations is equal. 25. A channel reservation system, comprising: an access point and a site;  The access point includes: an initial frame sending module, configured to send an initial frame, where the initial frame carries response frame reply indication information, and the response frame reply indication information is used to indicate multi-user multiple input multiple output MU- a station that responds to the response frame in the MIMO packet; the channel reservation determining module is configured to: after receiving the response frame replied by the station, determine that the channel reservation with the station is successful;  The station includes: a receiving module, configured to receive an initial frame from the access point; and a response frame replying module, configured to determine, according to the response frame reply indication information, whether to reply the response frame; if yes, reply to the Response frame. The system according to claim 25, wherein the access point further comprises: a location sequence notification module, configured to notify MU-MIMO packet information to each station, wherein the packet information includes MU-MIMO The positional order information of the sites contained in the group;  The initial frame sending module includes:  The sequence correspondence unit is configured to sequentially indicate, according to the location order information, whether each station in the MU-MIMO packet returns a response frame according to the location sequence information; the site further includes: a location sequence receiving module, configured to Receiving MU-MIMO packet information sent by the access point; The response frame replying module includes: a determining unit, configured to determine to reply to the response frame by the response frame reply indication information; and a reply sequence determining unit, configured to determine, after the determining unit determines to reply to the response frame, Determining a reply sequence of the response frame in response to the frame reply indication information and the location order information; wherein the reply sequence refers to the site and the The other stations in the MU-MIMO packet reply to the order of the response frames; the reply unit is arranged to reply the response frame in the order determined by the reply order determining unit. The system according to claim 26, wherein the reply sequence determining unit comprises: a first determining subunit, configured to determine, according to the response frame reply indication information, that each site in the MU-MIMO packet is required In response to the response frame, it is determined that the reply sequence of the response frame is the order corresponding to the position order information. The system according to claim 26, wherein the reply order determining unit comprises: a second determining subunit, configured to determine whether to reply a response frame according to the response frame reply indication information and the location order information; If yes, the site in the location sequence information that does not need to reply to the response frame is deleted, and a new location order is obtained, where the site determines that the response sequence of the response frame is the order corresponding to the new location order; if not, does not reply Response frame. The system according to claim 26, wherein the initial frame sent by the initial frame sending module further carries primary site indication information; the reply sequence determining unit includes:  a third determining subunit, configured to determine, according to the primary site indication information, whether it is a primary site; if yes, determining, according to the response frame reply indication information, that the response frame needs to be returned, determining that the response sequence of the response frame is the first reply If not, the primary site in the location sequence information is taken out to the first position, and the other sites are adjusted according to the relative position in the location sequence information to obtain a new location sequence, and the site determines the response frame. The reply order is the order in which the new position order corresponds. The system according to claim 26, wherein the response frame reply indication information in the initial frame sent by the initial frame sending module is the number of data streams of each station in the MU-MIMO packet;  The reply order determining unit includes:  And a fourth determining subunit, configured to perform, in accordance with the size of the data stream, each station in the MU-MIMO packet, and determine a reply order of the response frame as the sorted order. 31. The system of claim 30, wherein the fourth determining subunit comprises: The sorting subunit is set to determine the ordering between the plurality of stations according to the position order information when the number of data streams of the plurality of stations is equal.