WO2012028034A1 - 允许发送cts回复方法及系统 - Google Patents

允许发送cts回复方法及系统 Download PDF

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Publication number
WO2012028034A1
WO2012028034A1 PCT/CN2011/076925 CN2011076925W WO2012028034A1 WO 2012028034 A1 WO2012028034 A1 WO 2012028034A1 CN 2011076925 W CN2011076925 W CN 2011076925W WO 2012028034 A1 WO2012028034 A1 WO 2012028034A1
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WIPO (PCT)
Prior art keywords
sta
cts
mimo
group
reply
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PCT/CN2011/076925
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English (en)
French (fr)
Inventor
田开波
李峰
姜静
李楠
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中兴通讯股份有限公司
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Publication of WO2012028034A1 publication Critical patent/WO2012028034A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

Definitions

  • the present invention relates to the field of communications, and in particular to a method for allowing a CTS reply to be transmitted and a CTS system. Background technique
  • WLAN Wireless Local Area Networks
  • IEEE Institute of Electrical and Electronics Engineers 802.11 is one of the mainstream technologies for wireless LANs. This protocol mainly specifies physical layer PHY and MAC (Media Access Control, Media Access Control) layer specifications.
  • a primary object of the present invention is to provide a CTS reply method and system to solve at least the above problems.
  • a CTS reply method method including: an access point AP sends a request to send an RTS frame, where the RTS frame includes a group number of a multi-user multiple input multiple output MU-MIMO group, and each The MU-MIMO group includes at least one station STA; the group number of the MU-MIMO group is the same as the group number included in the RTS frame, and the STA that needs to reply to the CTS according to the preset information determines the reply CTS according to the preset information.
  • the method further includes: the STA of the AP performs a MU-MIMO packet, and assigns a group number to each MU-MIMO group, where the STA is a STA associated with the AP;
  • the MU-MIMO packet information is notified to the STA, where the MU-MIMO packet information includes a group number, all MU-MIMO groups corresponding to the group number, and relative position information of each STA in each MU-MIMO group.
  • Performing, by the AP, the MU-MIMO packet to the STA includes: the AP, according to a combination of any one or more attributes of the channel state information, the data traffic volume, and the data service type of the STA,
  • the STA performs MU-MIMO packetization.
  • the group specifies a group number for each MU-MIMO group, including: ⁇ !
  • the same group number is assigned to at least one MU-MIMO packet, at which time the relative position of the STAs in each MU-MIMO packet is fixed.
  • the STA that performs the CTS reply occupies different relative positions in the MU-MIMO group in which the group number is the same as the group number included in the RTS frame.
  • the RTS frame further includes: a primary STA identified by the media access control MAC address carried in the receiving address domain in the MAC frame header.
  • the group number of the MU-MIMO group is the same as the group number included in the RTS frame, and the STA that needs to reply to the CTS according to the preset information determines the order in which the CTS is replied according to the preset information, including: The replied STAs perform CTS replies in the order of their relative positions in the MU-MIMO group.
  • the group number of the MU-MIMO group is the same as the group number of the RTS frame, and the STA that needs to reply to the CTS according to the preset information determines the order in which the CTS is returned according to the preset information, including: The STA replies to the CTS when it is determined that the CTS reply is to be performed according to the preset information; after the primary STA replies to the CTS, the STAs that are to be CTS replies are in the order of their relative positions in the MU-MIMO group. Make a CTS reply.
  • the group number of the MU-MIMO group is the same as the group number of the RTS frame, and the STA that needs to reply to the CTS according to the preset information determines the order in which the CTS is returned according to the preset information, including: The STA replies to the CTS when it is determined that the CTS reply is not specified according to the preset information, and prohibits other designated STAs that are to be CTS replies with the same relative position of the primary STA to perform a CTS reply; After the CTS, the STAs to be CTS replies other than the primary STA and the STAs that are prohibited from replying to the CTS perform CTS replies in the order of their relative positions in the MU-MIMO group.
  • the group number of the MU-MIMO group is the same as the group number of the RTS frame, and the STA that needs to reply to the CTS according to the preset information determines the order in which the CTS is returned according to the preset information, including: The primary STA replies to the CTS when the STA determines that it is not designated to be CTS replied and there are no other STAs that are designated to reply to the CTS in the same relative position; after the primary STA replies to the CTS, the other The STAs to be CTS replies perform CTS replies in the order of their relative positions in the MU-MIMO group.
  • another CTS reply method including: an access point AP sends a request to send an RTS frame, where the RTS frame includes a group number of a multi-user multiple input multiple output MU-MIMO group, and The MU-MIMO group includes at least one STA; and the CTS that receives the MU-MIMO group whose group number is the same as the group number included in the RTS frame, and determines the STA that needs to reply to the CTS according to the preset information, where The order of CTS responses is determined based on preset information.
  • another CTS replies method including: a station STA receiving a request to send an RTS frame sent by an access point AP associated with the STA, where the RTS frame includes the RTS a group number of a multi-user multiple-input multi-output MU-MIMO group in which a CTS reply is performed, each MU-MIMO group includes at least one STA; and an order of determining a CTS reply by itself according to preset information, and when the sequence arrives Make a CTS reply.
  • a CTS reply system including an access point AP and a station STA: the AP is configured to send a request to send an RTS frame, where the RTS frame includes a multi-user multiple input multiple output MU-MIMO a group number of the group, each MU-MIMO group includes at least one STA; and a CTS that receives the STA number of the MU-MIMO group whose group number is the same as the group number of the RTS frame; the STA is set as the receiving station Describe the RTS frame; and, according to the preset information, determine the order in which the CTS reply and the CTS reply are required, and perform a CTS reply when the sequence arrives.
  • the AP is further configured to perform MU-MIMO grouping on the STA, and assign a group number to each MU-MIMO group, where the STA is a STA associated with the AP; and group the MU-MIMO The information is notified to the STA, where the MU-MIMO packet information includes a group number, all MU-MIMO groups corresponding to the group number, and relative position information of each STA in each MU-MIMO group.
  • the AP is further configured to perform MU-MIMO grouping on the STAs associated with the STA according to a combination of any one or more of the channel state information, the data traffic, and the data service type of the STA.
  • the AP is also arranged to assign the same group number to at least one MU-MIMO packet.
  • the STA is further configured to: determine, that the STAs to be CTS replies are in the group number and the
  • the RTS frame contains different relative positions in the MU-MIMO group with the same group number.
  • the STA is further configured to: perform a CTS reply according to the order of the relative positions of the STAs of the CTS to be replied in the MU-MIMO group.
  • the AP is further configured to: send an RTS frame that further includes a primary STA identified by a media access control MAC address carried in the receiving address domain in the MAC frame header.
  • the STA is further configured to: when the primary STA is designated to be CTS replied according to the preset information, to enable the primary STA to reply to the CTS; and, after the primary STA replies to the CTS, make other CTSs to be performed The replied STAs perform a CTS reply in the order of their relative positions in the MU-MIMO group.
  • the STA is further configured to: determine, by the preset information, that the primary STA is not specified
  • the primary STA When the CTS replies, the primary STA is replied to the CTS, and the other specified STAs that are in the same location as the primary STA are prohibited from performing CTS replies; and after the primary STA replies to the CTS, The primary STA and the STAs other than the STAs that are prohibited from replying to the CTS to perform CTS replies perform CTS replies in the order of their relative positions in the MU-MIMO group.
  • the STA is further configured to: when the preset information determines that the primary STA is not designated to perform a CTS reply and there are no STAs that are designated to reply to the CTS in the same relative position, causing the primary STA to reply to the CTS; After the primary STA replies to the CTS, the other STAs that are to be CTS replies are CTS replies in the order of their relative positions in the MU-MIMO group.
  • the RTS frame is sent to the STA associated with the AP, and the STA in the MU-MIMO group whose STA selection group number is the same as the group number included in the RTS frame determines the order of CTS reply according to the preset information, and according to the preset information, The CTS reply is made in the determined order.
  • the RTS/CTS exchange does not need to use specific signaling control, but by determining the order of the CTS reply, avoiding channel contention and collision, and achieving the effect of saving a large amount of resources and improving the security of the control.
  • FIG. 1 is a flowchart of processing of a first CTS reply method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a second CTS reply method according to an embodiment of the present invention
  • FIG. 1 is a flowchart of processing of a first CTS reply method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a second CTS reply method according to an embodiment of the present invention
  • FIG. 1 is a flowchart of processing a first CTS replies method according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps: Step 102: Access point AP Send the RTS frame to the STA (Station). (Better, the site is associated with the AP.
  • the RTS frame contains the group of the MU-MIMO group.
  • the number (for example, the MU-MIMO group may be a group to perform CTS reply to the RTS frame, which is exemplified below, but is not limited thereto;), each MU-MIMO group includes at least one STA; Step 104;
  • the group number of the MU-MIMO group is the same as the group number included in the RTS frame, and the STA that needs to reply to the CTS according to the preset information determines the order in which the CTS is replied according to the preset information, and sequentially replies to the CTS according to the determined order. As shown in FIG.
  • the AP sends an RTS frame to the STA associated with the AP, and the STA in the MU-MIMO group whose STA selection group number is the same as the group number included in the RTS frame determines the order in which the CTS reply is performed according to the preset information. And in the determined order
  • the RTS/CTS exchange does not require the use of specific signaling control, but avoids channel contention and collision by determining the order of CTS replies, thereby saving a lot of resources.
  • STAs need to be grouped.
  • a preferred method of grouping is: the AP performs MU-MIMO grouping on its associated STAs, and specifies each MU-MIMO group.
  • the MU-MIMO packet information is notified to the STA associated with the AP, where the MU-MIMO packet information includes a group number, all MU-MIMO groups corresponding to the group number, and each STA in each MU- Relative position information within a MIMO group.
  • the group number can be included in the physical frame header of the RTS frame.
  • the AP performs MU-MIMO grouping on the STAs associated with the AP, and may have multiple grouping manners.
  • each STA is sorted by identifier, and each 4 or 5 or 6 different number of STAs are divided into one.
  • the group may also be arbitrarily selected to be divided into a group of N STAs, where N is a natural number, and may also be grouped according to attributes of each STA, for example, according to channel state information, data traffic, and data service type of each STA.
  • each group of MU-MIMO groups can be assigned a group number. The same group number can be assigned to one MU-MIMO group, or can be assigned to multiple MU-MIMO groups. Depending on the situation.
  • the STAs in the MU-MIMO group whose group number is the same as the group number included in the RTS frame determine the order in which the CTS reply is performed according to the preset information, and in the determined order.
  • the preset information includes multiple types of information, for example, the STA identifier that is pre-designated by the AP, the STA identifier of the first group, or the STA identifier, which can determine the order in which the STA replies to the CTS.
  • the STA After receiving the MU-MIMO packet information, the STA can learn the group number of the STA, and can also know the relative location information of the STA in the MU-MIMO packet and all MU-MIMO packets under the group number. information. In practical applications, the group number is the same according to the way specified by the above group number.
  • the MU-MIMO group may be a group or a group, and each group includes at least one STA, however, Not every STA needs to make a CTS reply.
  • the STA is filtered by using preset information. If the STA does not need to perform a CTS reply, the STA is directly selected to ignore, and there is no need to reply to the CTS. However, if the STA needs to perform If the CTS replies, it is necessary to further confirm the reply sequence of the STA. For example, if the STA's reply sequence is the third digit, the CTS reply is performed after the STA ranked second.
  • a preferred implementation manner is as follows: acknowledging that the STAs performing CTS replies occupy different relatives in the MU-MIMO group whose group number is the same as the group number included in the RTS frame. position. For example, there are currently three MU-MIMO groups, each of which includes 4 elements, and the group numbers of the three MU-MIMO groups are all 1. At this time, the first STA that replies to the CTS is in the first The first position of a MU-MIMO group, the second STA that replies to the CTS is in the second position of the second MU-MIMO group, and the third and fourth STAs that reply to the CTS are in the third MU.
  • the three MU-MIMO components are 1 J is [STA 1 , STA 2 , STA 3 , STA 4 ] , [STA1 , STA6 , STA 7 , STA 8 ] , [ STA1 , STA 2 , STA 9 , STA 3 ] , and then the CTS is replied to.
  • the order is STA1, STA6, STA9, and STA3.
  • the RTS frame may further include: a primary STA identified by a MAC address carried in the receiving address field in the MAC frame header. Of course, it is also possible to not include the primary STA.
  • the primary STA is the STA with the highest importance and the CTS needs to be as fast as possible.
  • priority is given to the primary STA.
  • the STA replies to the CTS.
  • the group number is the same as the group number included in the RTS frame.
  • the STAs in the MIMO group determine the order in which the CTS replies are performed according to the preset information, and specifically include: the STAs to be CTS replies perform CTS replies in the order of their relative positions in the MU-MIMO group.
  • the STA in the MU-MIMO group whose group number is the same as the group number included in the RTS frame determines the order in which the CTS reply is performed according to the preset information, and specifically includes: the primary STA determines that it is designated to be CTS reply according to the preset information.
  • the primary STA replies to the CTS After the primary STA replies to the CTS, other STAs that are to be CTS replies perform CTS replies in the order of their relative positions in the MU-MIMO group.
  • the relative position information of the primary STA in the MU-MIMO group may be the same as the relative position of other designated STAs in the MU-MIMO group.
  • the group number is the same as the group number of the MU-MIMO group included in the RTS frame.
  • the STA in the middle determines the order in which the CTS reply is performed according to the preset information, and specifically includes: when the primary STA determines that it is not designated to perform the CTS reply according to the preset information, replies to the CTS, and prohibits other designations that are the same as the primary STA.
  • the CTS reply is sequentially performed.
  • the relative location information of the primary STA in the MU-MIMO group may not be the same as the relative position of other designated STAs in the MU-MIMO group, but the primary STA does not specify the STA that needs to reply to the CTS.
  • the STA in the MU-MIMO group whose group number is the same as the group number included in the RTS frame determines the order in which the CTS reply is performed according to the preset information, and the specific STA includes: the primary STA determines that it is not designated to perform CTS according to the preset information.
  • FIG. 2 is a flowchart of a second CTS reply method according to an embodiment of the present invention. As shown in FIG.
  • Step 202 AP sends The RTS frame is located at the STA associated with the AP, and the RTS frame includes the group number of the MU-MIMO group that performs CTS reply to the RTS frame, and each MU-MIMO group includes at least one STA.
  • This embodiment also provides another CTS replies method.
  • FIG. 3 is a flowchart of processing a third CTS replies method according to an embodiment of the present invention. As shown in FIG.
  • Step 302 STA receiving An RTS frame sent by the access point AP associated with the STA, the RTS frame includes a group number of a MU-MIMO group that performs CTS reply to the RTS frame, and each MU-MIMO group includes at least one STA;
  • Step 304 according to the pre- Let the information determine the order in which the CTS reply is made by itself, and perform a CTS reply when the order arrives.
  • Preferred Embodiment 1 It is assumed that there are 1 AP in the network and 6 STAs associated with the AP, and 6 STAs are respectively represented as STA-1, STA-2, STA-3, STA-4, STA-5, STA. -6;
  • Each MU-MIMO group consists of up to 4 STAs.
  • the MU-MIMO group of less than 4 STAs is still considered to be composed of 4 STAs.
  • the insufficient part can be considered to have virtual STAs.
  • the AP divides the MU-MIMO group into multiple MU-MIMO groups according to the channel state information of each STA, and notifies the group information to the corresponding STAs.
  • Each STA receives the information and performs detection. However, only STA-1, STA-2, STA-4, and STA-6 use this information as useful information because there is a STA identifier matching the self in the received information.
  • the AP Before performing the MU-MIMO data transmission of the packet, the AP sends an RTS frame, where the MAC address in the MAC address field in the RTS frame payload is the MAC address of STA-6, that is, STA-6 is the primary STA.
  • STA-1 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address does not match, further knowing that you are not the primary
  • the primary STA is STA-6; according to the released MU-MIMO group information, the valid information obtained by STA-1 includes: 1) itself is in the fourth position of the packet; 2) STA-6 is in the second of the group In combination with the information, according to the method provided in this embodiment, STA-1 needs a fourth reply CTS frame.
  • STA-2 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. The MAC address does not match, and further knows that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-2 includes: 1) the first position of the packet; 2 STA-6 is in the second position of this packet; in combination with the information, according to the method provided in this embodiment, STA-2 needs to obtain a second reply CTS frame.
  • STA-4 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address does not match, and further knows that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-4 includes: 1) The third position of the packet is; 2 STA-6 is in the second position of this packet; in combination with the information, according to the method provided in this embodiment, STA-2 needs to obtain a third reply CTS frame.
  • the STA-6 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number by using the group number information contained in the frame header, and parses the MAC included in the frame frame payload.
  • the address which matches its own MAC address, further knows that it is the primary STA. According to the method provided in this embodiment, the STA-6 first responds to the CTS frame.
  • the remaining STAs receive the RTS frame and parse the group number information contained in the physical frame header of the frame, which is inconsistent with the group number information of the frame, and does not need to reply to the CTS. Finally, the STAs that reply to the CTS are in the following order:
  • the first reply to the CTS STA is the primary STA, STA-6;
  • the fourth STA that replies to the CTS is STA-1.
  • Preferred Embodiment 2 It is assumed that there are 1 AP in the network and 9 STAs associated with the AP, and 9 STAs are respectively represented as STA-1, STA-2, STA-3, STA-4, STA-5, STA. -6, STA-7, STA-8, STA-9;
  • Each MU-MIMO group consists of up to 4 STAs.
  • the MU-MIMO group of less than 4 STAs is still considered to be composed of 4 STAs. It is considered that there is a virtual STA.
  • the AP divides the STAs into multiple MU-MIMO groups according to the channel state information of each STA, and notifies the STAs of all the group information.
  • the I_group number is not enough, and each group number can indicate multiple MU-MIMO groups, but There is such a constraint that if the same STA appears in multiple MU-MIMO groups indicated by the same group number, then the relative positions of the STAs in the groups in these groups are fixed.
  • the AP pre-determines that the STA of the first published MU-MIMO group replies to the CTS under the same group number, and if the primary STA is the STA that replies to the CTS, the CTS is still replied in the order of relative position within the packet. After receiving the information, each STA performs detection.
  • STA-l receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and then obtains the MU-MIMO packet information according to the published, STA-1 obtains Valid information: It is in the first MU-MIMO group and is in the fourth position in the MU-MIMO group; according to the method provided in this embodiment, STA-1 needs a fourth reply CTS frame.
  • the STA-2 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and then obtains the MU-MIMO packet information according to the released, STA-2 obtains Valid information: It is only in the second MU-MIMO group; according to the method provided in this embodiment, the STA-2 does not need to reply to the CTS.
  • STAs of the second embodiment which have the same processing as STA-2 include STA-4 and STA-9.
  • STA-3 receives the RTS frame, parses the frame, and knows that it does not belong to the MU-MIMO group under the group number through the group number information included in the frame header. According to the method provided in this embodiment, the STA-3 does not need to reply. CTS. In the second embodiment, STAs having the same processing as STA-3 also have STA-8.
  • STA-5 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and then obtains the MU-MIMO packet information according to the release, STA-5 obtains Valid information: It is in the first MU-MIMO group and is in the first position in this MU-MIMO group; according to the method provided in this embodiment, STA-5 needs the first reply CTS frame.
  • the STA-6 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address is matched, that is, it is known that it is the primary STA. Although it is the primary STA, according to the method provided in this embodiment, the STA-6 replies to the CTS frame.
  • the STA-7 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and obtains the MU-MIMO packet information according to the published information.
  • Valid information It is in the first MU-MIMO group and is in the third position in this MU-MIMO group; according to the method provided in this embodiment, STA-7 needs a third reply CTS frame.
  • the STAs that reply to the CTS are in the following order: • The first STA that replies to the CTS is STA-5;
  • the STA of the CTS is STA-1.
  • the preferred embodiment 3 assumes that there are 1 AP in the network and 9 STAs associated with the AP, and 9 STAs are respectively represented as STA-1, STA-2, STA-3, STA-4, STA-5, STA- 6, STA-7, STA-8, STA-9;
  • Each MU-MIMO group consists of up to 4 STAs.
  • the MU-MIMO group of less than 4 STAs is still considered to be composed of 4 STAs. The insufficient part can be considered.
  • the AP divides the STAs into multiple MU-MIMO groups according to the channel state information of each STA, and notifies the STAs of all the group information.
  • the I_group number is not enough, and each group number can indicate multiple MU-MIMO groups, but There is such a constraint that if the same STA appears in multiple MU-MIMO groups indicated by the same group number, then the relative position of the STA in the groups in these packets is fixed.
  • the AP pre-determines the STA of the MU-MIMO group issued by the first one under the same group number, and if the primary STA is the STA that replies to the CTS, the primary STA first responds to the CTS. After each STA receives this information, it performs detection.
  • the detection result is as follows:
  • STA-1 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address does not match, and further knows that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-1 includes: 1) being in three MU-MIMO groups, and In the MU-MIMO group in the fourth position; 2) STA-6, the primary STA is in the third position In the MU-MIMO group, and in a MU-MIMO group in the second position; synthesizing the information, according to the method provided in this embodiment, STA-1 needs a fourth reply CTS frame.
  • the STA-2 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the frame frame payload, and this address and its own MAC address. If the address does not match, it is further known that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-2 includes: 1) It is only in the second MU-MIMO group; According to the method provided in this embodiment, the STA-2 does not need to reply to the CTS frame.
  • STAs having the same processing procedure as STA-2 in this embodiment also have STA-4 and STA-9.
  • the STA-3 receives the RTS frame, parses the frame, and learns that the MU-MIMO group does not belong to the group number through the group number information included in the frame header. According to the method provided in this embodiment, the CTS does not need to be replied.
  • the STA having the same processing procedure as STA-3 also has STA-8.
  • the STA-5 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the frame frame payload, and this address and its own MAC address. If the address is not matched, it is further known that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-5 includes: 1) being in the first MU-MIMO group, and In this MU-MIMO group, it is in the first position; 2) STA-6, that is, the primary STA is in the three MU-MIMO groups, and is in the second position in one MU-MIMO group; For the method provided by the example, STA-5 is in the first position of the first group, but it is not the primary STA, so after waiting, the second reply CTS frame.
  • the STA-6 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the frame frame payload, and this address and its own MAC address.
  • the address matches, that is, it is known that it is the primary STA.
  • STA-6 first responds to the CTS frame.
  • the STA-7 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the frame frame payload, and this address and its own MAC address. If the address is not matched, it is further known that the user is not the primary STA, and the primary STA is the STA-6.
  • the valid information obtained by the STA-7 includes: 1) being in the first MU-MIMO group, and here The MU-MIMO group is in the third position; 2) the STA-6, that is, the primary STA is in the three MU-MIMO groups, and is in the second position in one MU-MIMO group; combining these information, according to the embodiment
  • STA-7 requires a third reply to the CTS frame.
  • the STAs that reply to the CTS are in the following order: • The first STA that replies to the CTS is the primary STA, STA-6;
  • the STA of the CTS is STA-1.
  • Preferred Embodiment 4 There are 1 AP in the network and 9 STAs associated with the AP, and 9 STAs are respectively represented as STA-1, STA-2, STA-3, STA-4, STA-5, STA-6, STA-7, STA-8, STA-9;
  • Each MU-MIMO group consists of up to 4 STAs, and the MU-MIMO group of less than 4 STAs is still considered to consist of 4 STAs, the insufficient part It can be considered that there are virtual STAs.
  • the AP divides the STAs into multiple MU-MIMO groups according to the channel state information of each STA, and notifies the STAs of all the group information.
  • the I_group number is not enough, and each group number can indicate multiple MU-MIMO groups, but There is such a constraint that if the same STA appears in multiple MU-MIMO groups indicated by the same group number, then the relative positions of the STAs in the groups in these groups are fixed.
  • the identifier of the 4 STAs of the ⁇ column, and the order in which the three MU-MIMO packet information is issued are also in the order written above. It is assumed that the AP pre-determines the STA of the MU-MIMO group issued by the first one under the same group number to reply to the CTS. If the primary STA is not the STA that replies to the CTS, it does not need to reply to the CTS. After each STA receives this information, it performs detection. The detection result is as follows:
  • STA-1 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC included in the frame frame payload. Address, which does not match its own MAC address, further knows that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-1 includes: 1) It is in three In the MU-MIMO group, and in the MU-MIMO group in the fourth position; 2) STA-6, that is, the primary STA is in two MU-MIMO groups, and is in the second position in the MU-MIMO group, but does not exist In the first MU-MIMO group; synthesizing the information, according to the method provided in this embodiment, STA-1 needs a fourth reply CTS frame.
  • the STA-2 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the frame frame payload, and this address and its own MAC address. If the address does not match, it is further known that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-2 includes: 1) It is only in the second MU-MIMO group; According to the method provided in this embodiment, the STA-2 does not need to reply to the CTS frame.
  • STAs having the same processing procedure as STA-2 in this embodiment also have STA-4 and STA-9.
  • the STA-3 receives the RTS frame, parses the frame, and learns that the MU-MIMO group does not belong to the group number through the group number information included in the frame header. According to the method provided in this embodiment, the CTS does not need to be replied.
  • the STA-5 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the frame frame payload, and this address and its own MAC address. If the address is not matched, it is further known that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-5 includes: 1) being in the first MU-MIMO group, and In the first position in the MU-MIMO group; 2) STA-6, that is, the primary STA is in two MU-MIMO packets, and the MU-MIMO packet is in the second position, but not in the first MU In the MIMO group; synthesizing the information, according to the method provided in this embodiment, STA-5 needs to reply to the CTS frame first.
  • the STA-6 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the frame frame payload, and this address and its own MAC address. Address matching, that is, it is known that it is the primary STA, and according to the released MU-MIMO packet information, STA-6 does not exist in the first MU-MIMO group. According to the method provided in this embodiment, STA-6 does not need to Reply to the CTS frame.
  • STA-7 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address does not match, and further knows that it is not the primary STA.
  • the primary STA is STA-6.
  • the valid information obtained by STA-7 includes: 1) It is in the first MU-MIMO group. And here
  • ⁇ STA-8 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address does not match, and further knows that it is not the primary STA.
  • the primary STA is STA-6. According to the released MU-MIMO packet information, the valid information obtained by STA-8 includes: 1) It is in the first MU-MIMO group. And in the second position in this MU-MIMO group; 2) STA-6 is the primary STA in two
  • the STA-8 needs the fourth Reply to the CTS frame.
  • the STAs that reply to the CTS are in the following order: • The first reply to the CTS STA is STA-5;
  • the fourth STA that replies to the CTS is STA-1.
  • Preferred Embodiment 5 There are one AP in the supporting network and nine STAs associated with the AP, and nine STAs are respectively represented as STA-1, STA-2, STA-3, STA-4, STA-5, STA-6, STA-7, STA-8, STA-9;
  • Each MU-MIMO packet consists of up to 4 STAs, and MU-MIMO packets of less than 4 STAs are still considered to consist of 4 STAs, the insufficient part It can be considered that there are virtual STAs.
  • the AP divides the STAs into multiple MU-MIMO groups according to the channel state information of each STA, and notifies the STAs of all the group information.
  • the I_group number is not enough, and each group number can indicate multiple MU-MIMO groups, but There is such a constraint that if the same STA appears in multiple MU-MIMO groups indicated by the same group number, then the relative positions of the STAs in the groups in these groups are fixed.
  • the order of the four STAs of the sequence ⁇ ⁇ column, the order in which the three MU-MIMO packet information is issued is also in the order written above.
  • the AP pre-determines that the STA of the first published MU-MIMO group replies to the CTS under the same group number, and the primary STA first replies to the CTS. If the primary STA is not the STA that replies to the CTS, it is to be from the STA that specifies the reply CTS. , culling the STAs occupying the same grouping position as the primary STA. After receiving the information, each STA performs detection. The detection results are as follows:
  • STA-1 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address does not match, and further knows that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-1 includes: 1) being in three MU-MIMO groups, and The MU-MIMO group is in the fourth position; 2) STA-6, that is, the primary STA is in two MU-MIMO groups, and is in the second position in the MU-MIMO group, but not in the first MU-MIMO In the group; synthesizing the information, according to the method provided in this embodiment, STA-1 needs a fourth reply CTS frame.
  • STA-2 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address does not match, and further knows that it is not the primary STA, and the primary STA is STA-6. According to the released MU-MIMO packet information, the valid information obtained by STA-2 includes: 1) It is only in the second MU-MIMO group. According to the method provided in this embodiment, the STA-2 does not need to reply to the CTS frame.
  • the STAs having the same processing procedure as the STA-2 include STA-4 and STA-9.
  • the STA-3 receives the RTS frame, parses the frame, and learns that the MU-MIMO group does not belong to the group number through the group number information included in the frame header. According to the method provided in this embodiment, the CTS does not need to be replied.
  • the STA-5 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the frame frame payload, and this address and its own MAC address. If the address is not matched, it is further known that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-5 includes: 1) being in the first MU-MIMO group, and In the first position in the MU-MIMO group; 2) STA-6, that is, the primary STA is in two MU-MIMO groups, and is in the second position in the MU-MIMO group, but does not exist in the first MU In the MIMO group; synthesizing this information, according to the method provided in this embodiment, STA-5 is in the first position of the first packet, but it is not the primary STA, and therefore needs to wait for the second reply CTS frame.
  • the STA-6 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the frame frame payload, and this address and its own MAC address. Address matching, that is, it is known that it is the primary STA. According to the method provided in this embodiment, although STA-6 does not exist in the first MU-MIMO group, STA-6 is the primary STA, so STA-6 is the first. Respond to CTS frames.
  • the STA-7 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the frame frame payload, and this address and its own MAC address. If the address is not matched, it is further known that the user is not the primary STA, and the primary STA is the STA-6.
  • the valid information obtained by the STA-7 includes: 1) being in the first MU-MIMO group, and In the MU-MIMO group, it is in the third position; 2) STA-6, that is, the primary STA is in two MU-MIMO groups, and the MU-MIMO packet is in the second position, but does not exist in the first MU.
  • STA-7 needs a third reply CTS frame.
  • the STA-8 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the frame frame payload, and this address is associated with its own MAC address. If the address is not matched, it is further known that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-8 includes: 1) being in the first MU-MIMO group, and here The MU-MIMO group is in the second position; 2) STA-6, that is, the primary STA is in two MU-MIMO groups, and is in the second position in the MU-MIMO group, but does not exist in the first MU-MIMO In the group; synthesizing the information, according to the method provided in this embodiment, although STA-8 is in the first MU-MIMO group, its relative position in the packet is relative to the primary STA-6 in its group. Repeated, so STA-8 cannot reply to CTS frames. Finally, the STAs that reply to the CTS are in the following order:
  • the first reply to the CTS STA is the primary STA, STA-6;
  • the second reply CTS STA is STA-5;
  • the third reply CTS STA is STA-7;
  • the STA of the CTS is STA-1.
  • Preferred Embodiment 6 It is assumed that there are 1 AP in the network and 9 STAs associated with the AP, and 9 STAs are represented as STA-1, STA-2, STA-3, STA-4, STA-5, STA, respectively. -6, STA-7, STA-8, STA-9;
  • Each MU-MIMO group consists of up to 4 STAs.
  • the MU-MIMO group of less than 4 STAs is still considered to be composed of 4 STAs. It is considered that there is a virtual STA.
  • the AP divides the STAs into multiple MU-MIMO groups according to the channel state information of each STA, and notifies the STAs of all the group information.
  • the I_group number is not enough, and each group number can indicate multiple MU-MIMO groups, but There is such a constraint that if the same STA appears in multiple MU-MIMO groups indicated by the same group number, the relative positions of the STAs in the groups in these packets are fixed.
  • the order of the four STAs of the sequence ⁇ ⁇ column, the order in which the three MU-MIMO packet information is issued is also in the order written above.
  • each STA performs detection.
  • the detection results are as follows:
  • STA-1 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address does not match, and further knows that it is not the primary STA, and the primary STA is STA-6.
  • the valid information obtained by STA-1 includes: 1) being in three MU-MIMO groups, and The MU-MIMO group is in the fourth position; 2) STA-6, that is, the primary STA is in two MU-MIMO groups, and is in the second position in the MU-MIMO group, but not in the first MU-MIMO In the group; in combination with the information, according to the method provided in this embodiment, STA-1 needs a fifth reply CTS frame.
  • STA-2 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address does not match, and further knows that it is not the primary STA, and the primary STA is STA-6. According to the released MU-MIMO packet information, the valid information obtained by STA-2 includes: 1) It is only in the second MU-MIMO group. According to the method provided in this embodiment, the STA-2 does not need to reply to the CTS frame. In this embodiment, the STAs having the same processing procedure as the STA-2 also have STA-4 and STA-9.
  • the STA-3 receives the RTS frame, parses the frame, and learns that the MU-MIMO group does not belong to the group number through the group number information included in the frame header. According to the method provided in this embodiment, the CTS does not need to be replied.
  • the STA-5 receives the RTS frame, parses the frame, and learns that it belongs to the MU-MIMO group under the group number by using the group number information included in the frame header, and parses the MAC address included in the receiving address field in the MAC frame header of the frame. This address does not match its own MAC address. It further knows that it is not the primary STA.
  • the primary STA is STA-6. According to the published MU-MIMO packet information, the valid information obtained by STA-5 includes: 1) It is in the first MU.
  • STA-6 the primary STA, is in two MU-MIMO groups, and is in the second position in the MU-MIMO group, but not Exist in the first MU-MIMO group; synthesize this information, provided according to this embodiment
  • the STA-5 although in the first position of the first group, is not the primary STA, so it needs to wait for the second reply CTS frame.
  • the STA-6 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address is matched, that is, it is known that it is the primary STA. According to the method provided in this embodiment, although STA-6 does not exist in the first MU-MIMO group, STA-6 is the primary STA, so STA-6 One reply CTS frame.
  • STA-7 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address does not match, further knowing that you are not the primary
  • the primary STA is STA-6; according to the released MU-MIMO packet information, the valid information obtained by STA-7 includes: 1) It is in the first MU-MIMO group, and is in the MU-MIMO group. Three locations; 2) STA-6, that is, the primary STA is in two MU-MIMO groups, and is in the second position in the MU-MIMO group, but not in the first MU-MIMO group; According to the method provided in this embodiment,
  • STA-7 needs a fourth reply CTS frame.
  • STA-8 receives the RTS frame, parses the frame, and knows that it belongs to the MU-MIMO group under the group number through the group number information contained in the frame header, and parses the MAC address contained in the frame frame payload. This address is related to its own. The MAC address does not match, and further knows that it is not the primary STA.
  • the primary STA is STA-6.
  • the valid information obtained by STA-8 includes: 1) It is in the first MU-MIMO group.
  • STA-6 that is, the primary STA is in two MU-MIMO groups, and is in the second position in the MU-MIMO group, but does not exist in the first In a MU-MIMO group; synthesizing this information, according to the method provided in this embodiment, STA-8 needs a third reply CTS frame.
  • the STAs that reply to the CTS are in the following order:
  • the first reply to the CTS STA is the primary STA, STA-6;
  • the third STA that replies to the CTS is STA-8; • The fourth STA that replies to the CTS is STA-7;
  • the STA of the CTS is STA-1.
  • the embodiment also provides a CTS reply system.
  • the specific structure is as shown in FIG. 4, including an access point AP 401 and a station STA 402 associated with the AP 401: AP 401, configured to send a request to send an RTS frame, and the RTS frame includes a pair.
  • the STA 402 is configured to receive the RTS frame; and, according to the preset information, determine the order in which the CTS reply is performed by itself, and perform a CTS reply when the sequence arrives.
  • the AP 401 may also be configured to perform MU-MIMO grouping on the STA 402 associated therewith, and assign a group number to each MU-MIMO group; and group the MU-MIMO group The information is notified to the STA 402 associated with the AP 401, wherein the MU-MIMO packet information includes a group number, all MU-MIMO groups corresponding to the group number, and relative position information of each STA 402 within each MU-MIMO group.
  • the AP 401 may also be configured to be based on a combination of any one or more of channel state information, data traffic, and data service type of the STA associated with the STA.
  • the associated STA performs MU-MIMO packetization.
  • the AP 401 may also be configured to allocate the same group number to at least one MU-MIMO packet.
  • the STA 402 may be further configured to: determine that each STA to be subjected to the CTS reply occupies a different relative position in the MU-MIMO group whose group number is the same as the group number included in the RTS frame.
  • the STA 402 may be further configured to: perform a CTS reply according to the order of the relative positions of the STAs of the CTS to be replied in the MU-MIMO group.
  • the AP 401 may be further configured to: send an RTS frame that further includes the primary STA identified by the multiple access channel MAC address carried in the receiving address field in the MAC frame header.
  • the STA 402 may be further configured to: when determining that the primary STA is designated to be CTS replied according to the preset information, causing the primary STA to reply to the CTS; and, after the primary STA replies to the CTS, Other STAs that are to be CTS replies perform CTS replies in the order of their relative positions in the MU-MIMO group.
  • the STA 402 may be further configured to: when determining, according to the preset information, that the primary STA is not designated to perform a CTS reply, causing the primary STA to reply to the CTS and prohibiting the same location as the primary STA.
  • the other specified STAs to be CTS replies perform CTS replies; and, after the primary STA replies to the CTS, other STAs other than the primary STA and the STAs that are prohibited from replying to the CTS are to be in the MU-MIMO group.
  • the CTS reply is made in the order of relative position.
  • the STA 402 may be further configured to: when the preset information determines that the primary STA is not designated to perform the CTS reply and there are no other STAs that are designated to reply to the CTS in the same relative position, causing the primary STA to reply to the CTS; After the primary STA replies to the CTS, the other STAs that are to be CTS replies are CTS replies in the order of their relative positions in the MU-MIMO group.
  • the AP sends an RTS frame to the STA associated with the AP, and the STA in the MU-MIMO group whose STA selection group number is the same as the group number included in the RTS frame determines the order in which the CTS reply is performed according to the preset information.
  • the CTS reply is performed in the determined order.
  • the RTS/CTS exchange does not need to use specific signaling control, but avoids channel contention and collision by determining the order of CTS replies, which can save a lot of resources and improve the security of control.
  • the primary STA preferentially replies to the CTS, ensuring that the primary STA's service is preferentially guaranteed.
  • 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.
  • the computing device 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.
  • 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.

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Abstract

本发明公开了允许发送CTS回复方法及CTS系统，该方法包括：接入点AP发送请求发送RTS帧，所述RTS帧中包含多用户多输入多输出MU-MIMO组的组编号，每个MU-MIMO组包括至少一个站点STA；所在MU-MIMO组的组编号与所述RTS帧包含的组编号相同、且根据预设信息确定需要回复CTS的STA按照所述预设信息确定其回复CTS的顺序，并依据确定的顺序依送复CTS。通过本发明能够达到节省大量资源，提高控制的安全性的效果。

Description

允许发送 CTS回复方法及系统 技术领域 本发明涉及通信领域， 具体而言， 涉及允许发送 CTS回复方法及 CTS 系 统。 背景技术
WLAN(Wireless Local Area Networks, 无线局 i或网络)是应用无线通信技术 将计算机设备互联起来， 构成可以互相通信和实现资源共享的网络体系。 无线 局域网本质的特点是不再使用通信电缆将计算机与网络连接起来， 而是通过无 线的方式连接， 从而使网络的构建和终端的移动更加灵活。 IEEE ( Institute of Electrical and Electronics Engineers, 电气和电子工程师学会 ) 802.11是目前无 线局域网的主流技术之一，此协议主要规定物理层 PHY和 MAC( , Media Access Control , 媒体访问控制） 层规范。 随着移动通信技术的发展以及人们对无线网络的需求的提高， 物理层技术 规范向着速率越来越高的方向不断发展， 经历了 802.11 到 802.11b 再到 802. Ha/g, 然后 802.11η, 最后到 802.1 lac的发展历程。 实际的物理技术也从 直接序列扩频技术发展到 OFDM ( Orthogonal Frequency Division Multiplex, 正 交频分复用）技术，并且在 IEEE802.11n中引入了多天线技术，在 IEEE802.11ac 中引入大带宽和 MU-MIMO ( multi-user multiple input multiple output, 多用户 多输人多输出）。 在釆用 RTS/CTS (Request To Send/Clear To Send, 请求发送 /允许发送)机制 的 MU-MIMO 系统中， 由于信道是有限的， RTS/CTS 间的交换需要使用特定 的信令控制， 否则会出现争抢信道的情况， 造成资源的浪费。 但是， 在 MU-MIMO系统中出现大量 RTS/CTS交换时， 控制信令的数量 极多， 在传输时占用大量资源， 也会造成信道的堵塞， 降低控制的准确性。 发明内容 本发明的主要目的在于提供 CTS回复方法及系统， 以至少解决上述问题。 根据本发明的一个方面， 提供了一种 CTS 回复方法方法， 包括： 接入点 AP发送请求发送 RTS帧，所述 RTS帧中包含多用户多输入多输出 MU-MIMO 组的组编号， 每个 MU-MIMO组包括至少一个站点 STA; 所在 MU-MIMO组 的组编号与所述 RTS帧包含的组编号相同、且根据预设信息确定需要回复 CTS 的 STA按照所述预设信息确定其回复 CTS的顺序， 并依据确定的顺序依次回 复 CTS。 所述 AP发送 RTS帧之前， 还包括： 所述 AP所述 STA进行 MU-MIMO 分组， 并为每个 MU-MIMO组指定一个组编号， 其中， STA为与该 AP相关联 的 STA; 以及将 MU-MIMO分组信息通知给所述 STA, 其中， 所述 MU-MIMO 分组信息包括组编号、 该组编号对应的所有 MU-MIMO组以及各 STA在每个 MU-MIMO组内的相对位置信息。 所述 AP对所述 STA进行 MU-MIMO分组， 包括： 所述 AP才艮据所述 STA 的信道状态信息、数据业务量、数据业务类型中的任意一项或多项属性的组合， 对所述 STA进行 MU-MIMO分组。 所述为每个 MU-MIMO组指定一个组编号， 包括： ^！夺同一个组号分配给至 少一个 MU-MIMO分组， 此时每个 MU-MIMO分组中的 STA的相对位置是固 定的。 进行 CTS 回复的 STA在所述组编号与所述 RTS 帧包含的组编号相同的 MU-MIMO组中占据不同相对位置。 所述 RTS帧中还包含： MAC帧头中接收地址域承载的媒体访问控制 MAC 地址所标识的首要 STA。 所在 MU-MIMO组的组编号与所述 RTS帧包含的组编号相同、 且才艮据预 设信息确定需要回复 CTS的 STA按照所述预设信息确定其回复 CTS的顺序， 包括： 待进行 CTS回复的 STA按照其在 MU-MIMO组中的相对位置的先后顺 序进行 CTS回复。 所在 MU-MIMO组的组编号与所述 RTS帧包含的组编号相同、 且才艮据预 设信息确定需要回复 CTS的 STA按照所述预设信息确定其回复 CTS的顺序， 包括： 所述首要 STA根据所述预设信息确定其被指定待进行 CTS回复时， 回 复 CTS; 在所述首要 STA回复 CTS之后， 其他待进行 CTS回复的 STA按其 在 MU-MIMO组中的相对位置的先后顺序进行 CTS回复。 所在 MU-MIMO组的组编号与所述 RTS帧包含的组编号相同、 且才艮据预 设信息确定需要回复 CTS的 STA按照所述预设信息确定其回复 CTS的顺序， 包括： 所述首要 STA根据所述预设信息确定其未被指定进行 CTS回复时， 回 复 CTS , 并禁止与所述首要 STA相对位置相同的其他指定的待进行 CTS回复 的 STA进行 CTS回复； 在所述首要 STA回复 CTS之后， 除所述首要 STA以 及被禁止回复 CTS 的 STA 之外的其他待进行 CTS 回复的 STA 按其在 MU-MIMO组中的相对位置的先后顺序进行 CTS回复。 所在 MU-MIMO组的组编号与所述 RTS帧包含的组编号相同、 且才艮据预 设信息确定需要回复 CTS的 STA按照所述预设信息确定其回复 CTS的顺序， 包括： 所述首要 STA 居所述预设信息确定其未被指定待进行 CTS回复且相 同的相对位置上不存在其他被指定回复 CTS 的 STA 时， 所述首要 STA回复 CTS; 在所述首要 STA回复 CTS之后， 其他待进行 CTS回复的 STA按其在 MU-MIMO组中的相对位置的先后顺序进行 CTS回复。 根据本发明的另一方面， 提供了另外一种 CTS 回复方法， 包括： 接入点 AP发送请求发送 RTS帧，所述 RTS帧中包含多用户多输入多输出 MU-MIMO 组的组编号， 每个 MU-MIMO 组包括至少一个 STA； 以及接收到所在 MU-MIMO组的组编号与所述 RTS帧包含的组编号相同、且艮据预设信息确定 需要回复 CTS的 STA回复的 CTS , 其中， CTS回复的顺序根据预设信息确定。 根据本发明的另一方面， 提供了另外一种 CTS回复方法， 包括： 站点 STA 接收与所述 STA相关联的接入点 AP发送的请求发送 RTS帧， 所述 RTS帧中 包含对所述 RTS帧进行 CTS回复的多用户多输入多输出 MU-MIMO组的组编 号， 每个 MU-MIMO组包括至少一个 STA; 以及根据预设信息确定自身进行 CTS回复的顺序， 并在所述顺序到达时进行 CTS回复。 根据本发明的另一方面， 提供了 CTS 回复系统， 包括接入点 AP 和站点 STA: 所述 AP, 设置为发送请求发送 RTS帧， 所述 RTS帧中包含多用户多输 入多输出 MU-MIMO组的组编号， 每个 MU-MIMO组包括至少一个 STA; 以 及， 接收所在 MU-MIMO组的组编号与所述 RTS帧的组编号相同的 STA回复 的 CTS; 所述 STA, 设置为接收所述 RTS 帧； 以及， 根据预设信息确定自身 需要进行 CTS回复以及进行 CTS回复的顺序， 并在所述顺序到达时进行 CTS 回复。 所述 AP还设置为对所述 STA进行 MU-MIMO分组，并为每个 MU-MIMO 组指定一个组编号， 其中， 所述 STA 为与所述 AP 相关联的 STA; 以及将 MU-MIMO分组信息通知给所述 STA, 其中， 所述 MU-MIMO分组信息包括 组编号、 该组编号对应的所有 MU-MIMO组以及各 STA在每个 MU-MIMO组 内的相对位置信息。 所述 AP还设置为根据所述 STA的信道状态信息、 数据业务量、 数据业务 类型中的任意一项或多项属性的组合， 对与其相关联的 STA进行 MU-MIMO 分组。 所述 AP还设置为将同一个组号分配给至少一个 MU-MIMO分组。 所述 STA还设置为： 确定各待进行 CTS回复的 STA在所述组编号与所述
RTS帧包含的组编号相同的 MU-MIMO组中占据不同相对位置。 所述 STA还设置为：按照各待回复 CTS的 STA在 MU-MIMO组中的相对 位置的先后顺序进行 CTS回复。 所述 AP还设置为： 发送还包含 MAC帧头中接收地址域承载的媒体访问 控制 MAC地址所标识的首要 STA的 RTS帧。 所述 STA还设置为： 根据所述预设信息确定所述首要 STA被指定待进行 CTS回复时， 令所述首要 STA回复 CTS; 以及， 在所述首要 STA回复 CTS之 后， 令其他待进行 CTS回复的 STA按其在 MU-MIMO组中的相对位置的先后 顺序进行 CTS回复。 所述 STA还设置为： 居所述预设信息确定所述首要 STA未被指定进行
CTS回复时， 令所述首要 STA回复 CTS , 并禁止与所述首要 STA相对位置相 同的其他指定的待进行 CTS回复的 STA进行 CTS回复；以及，在所述首要 STA 回复 CTS之后，除所述首要 STA以及被禁止回复 CTS的 STA之外的其他待进 行 CTS回复的 STA按其在 MU-MIMO组中的相对位置的先后顺序进行 CTS回 复。 所述 STA还设置为： 居所述预设信息确定所述首要 STA未被指定进行 CTS回复且相同的相对位置上不存在其他被指定回复 CTS的 STA时， 令所述 首要 STA回复 CTS; 以及， 在所述首要 STA回复 CTS之后， 令其他待进行 CTS回复的 STA按其在 MU-MIMO组中的相对位置的先后顺序进行 CTS回复。 通过本发明， ΑΡ发送 RTS帧至与该 AP相关联的 STA, STA选择组编号 与 RTS帧包含的组编号相同的 MU-MIMO组中的 STA根据预设信息确定进行 CTS 回复的顺序， 并按照确定的顺序进行 CTS 回复。 通过本发明， RTS/CTS 交换不需要使用特定的信令控制， 而是通过确定 CTS回复的顺序， 避免信道的 争抢及碰撞， 能够达到节省大量资源， 提高控制的安全性的效果。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的不 当限定。 在附图中： 图 1是本发明实施例提供的第一种 CTS回复方法的处理流程图； 图 2是本发明实施例提供的第二种 CTS回复方法的处理流程图； 图 3是本发明实施例提供的第三种 CTS回复方法的处理流程图； 以及， 图 4是本发明实施例提供的 CTS回复系统的结构示意图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在不 冲突的情况下， 本申请中的实施例及实施例中的特征可以相互组合。 本实施例提供了一种 CTS 回复方法， 图 1 是本发明实施例提供的第一种 CTS回复方法的处理流程图， 如图 1所示， 该流程包括如下步骤： 步骤 102、 接入点 AP发送 RTS帧至位于 STA ( Station, 站点）（较优地， 该站点是与 AP 相关联的， 以下以此为例进行说明， 但是并不限于此）， RTS 帧中包含 MU-MIMO组的组编号 （例如， MU-MIMO组可以是要对 RTS帧进 行 CTS回复的组，以下以此为例进行说明，但是并不限于此；)，每个 MU-MIMO 组包括至少一个 STA; 步骤 104、 所在 MU-MIMO组的组编号与 RTS帧包含的组编号相同、且才艮 据预设信息确定需要回复 CTS的 STA按照预设信息确定其回复 CTS的顺序， 并依据确定的顺序依次回复 CTS。 如图 1所示流程， AP发送 RTS帧至与 AP相关联的 STA, STA选择组编 号与 RTS帧包含的组编号相同的 MU-MIMO组中的 STA根据预设信息确定进 行 CTS回复的顺序， 并按照确定的顺序进行
CTS回复。 在本实施例中， RTS/CTS交换不需要使用特定的信令控制， 而 是通过确定 CTS回复的顺序避免信道的争抢及碰撞， 能够节省大量资源。 如图 1所示流程， 步骤 102在实施之前， 需要对 STA进行分组，一种较优 的分组方法为： AP 对与其相关联的 STA 进行 MU-MIMO 分组， 并为每个 MU-MIMO组指定一个组编号； 以及， 将 MU-MIMO分组信息通知给与 AP相 关联的 STA, 其中， MU-MIMO 分组信息包括组编号、 该组编号对应的所有 MU-MIMO组以及各 STA在每个 MU-MIMO组内的相对位置信息。 当然， 在 实施时， 还可以釆用其他分组方式， 例如， 利用网络侧的第三方对 STA进行分 组， 具体的分组方式取决于实际情况。 实施时， 较优的， 组编号可以包含在 RTS帧的物理帧头中。 实施时， AP对与其相关联的 STA进行 MU-MIMO分组， 可以有多种分组 方式， 例如， 将各 STA按标识进行排序， 每 4个或 5个或 6个等不同个数的 STA分成一组， 也可以直接任意选择 N个 STA分为了一组， 其中， N为自然 数， 也可以根据各 STA的属性进行分组， 例如， 根据各 STA的信道状态信息、 数据业务量、 数据业务类型中的任意一项或多项属性的组合， 对与该 AP相关 联的 STA进行 MU-MIMO分组。 在实施时， 分组结束后， 可以为各个 MU-MIMO组指定一个组编号， 同一 个组编号可以分配给一个 MU-MIMO组， 也可以分配给多个 MU-MIMO组， 具体的才艮据实际情况而定。 如图 1所示流程， 步 4聚 104在实施时， 组编号与 RTS帧包含的组编号相同 的 MU-MIMO组中的 STA根据预设信息确定其进行 CTS回复的顺序， 并按照 确定的顺序进行 CTS回复。 预设信息包含多种信息， 例如， 可以包含由 AP预 先指定的 STA标识，还可以包含第一组的 STA标识，或者单单包含 STA标识， 能够 居预设信息确定 STA 回复 CTS 的顺序即可。 其中， STA 在接收到 MU-MIMO分组信息后，可获知本 STA所处的组编号， 同时也可以获知本 STA 在 MU-MIMO分组内的相对位置信息以及此组编号下的所有 MU-MIMO分组 信息。 在实际应用中， 才艮据上述组编号指定的方式不同， 组编号相同的
MU-MIMO组可能为一组， 也可能为多组，每组中又至少包括一个 STA,但是， 并不是每个 STA都需要做出 CTS回复， 在本实施例中， 利用预设信息对 STA 进行筛选， 若 STA不需要进行 CTS回复， 则直接选择忽略， 无须回复 CTS , 但是， 若 STA需要进行 CTS回复， 则需要进一步确认本 STA的回复顺序， 例 如， 本 STA的回复顺序是第 3位， 则在排在第 2位的 STA回复后进行 CTS回 复。 为了保证进行 CTS回复的 STA不会出现信道争抢情况， 一种较优的实施 方式为： 确认进行 CTS 回复的 STA在组编号与 RTS 帧包含的组编号相同的 MU-MIMO组中占据不同相对位置。 例如， 目前存在三个 MU-MIMO组， 每个 MU-MIMO组中包括 4个元素， 且三个 MU-MIMO组的组编号均为 1 , 此时， 第一个回复 CTS的 STA是在第一个 MU-MIMO组的第一个位置， 第二个回复 CTS的 STA是在第二个 MU-MIMO组的第二个位置， 第三及第四个回复 CTS 的 STA是在第三个 MU-MIMO组的第三及第四个位置。 具体的， 例如， 三个 MU-MIMO组分另1 J为 [STA 1 , STA2, STA3 , STA4] , [STA1 , STA6, STA7, STA8] , [STA1 , STA2, STA9, STA3] , 则回复 CTS 的顺序为 STA1、 STA6、 STA9、 STA3。 实施时， 所述 RTS帧中还可以包含： MAC帧头中接收地址域 载的 MAC 地址所标识的首要 STA。 当然， 不包含首要 STA也是可以的。 通常， 首要 STA 是重要性最高、 CTS 回复需要尽快的 STA, 在本实施例中， 为保证首要 STA 的月艮务获得优先保障， 在与 AP相关联的 STA中存在首要 STA时， 优先让首 要 STA回复 CTS。 当然了， 在实施时， 若首要 STA并不是当前优先级最高的 STA, 或者出于 其他目的， 可以选择强制忽略首要 STA, 此时， 组编号与所述 RTS帧包含的组 编号相同的 MU-MIMO组中的 STA根据预设信息确定其进行 CTS回复的顺序， 具体包括： 待进行 CTS回复的 STA按照其在 MU-MIMO组中的相对位置的先 后顺序进行 CTS回复。 在实施中， 较优的， 为保证首要 STA的服务获得优先保障， 在与 AP相关 联的 STA 中存在首要 STA时， 优先让首要 STA回复 CTS。 此时， 组编号与 RTS帧包含的组编号相同的 MU-MIMO组中的 STA根据预设信息确定其进行 CTS回复的顺序， 具体包括： 首要 STA根据预设信息确定其被指定待进行 CTS回复时， 回复 CTS; 在首要 STA回复 CTS之后，其他待进行 CTS回复的 STA按其在 MU-MIMO 组中的相对位置的先后顺序进行 CTS回复。 实施时， 首要 STA在 MU-MIMO组中的相对位置信息可能与其他指定的 STA在 MU-MIMO组中的相对位置相同， 此时， 组编号与 RTS帧包含的组编 号相同的 MU-MIMO组中的 STA才艮据预设信息确定其进行 CTS回复的顺序， 具体包括： 首要 STA根据预设信息确定其未被指定进行 CTS回复时， 回复 CTS , 并 禁止与首要 STA相对位置相同的其他指定的待进行 CTS回复的 STA进行 CTS 回复； 在首要 STA回复 CTS之后， 除首要 STA以及被禁止回复 CTS的 STA之 外的其他待进行 CTS回复的 STA按其在 MU-MIMO组中的相对位置的先后顺 序进行 CTS回复。 同理， 实施时， 首要 STA在 MU-MIMO组中的相对位置信息可能不曾与 其他指定的 STA在 MU-MIMO组中的相对位置相同， 但是， 首要 STA也并不 是指定需要回复 CTS 的 STA, 此时， 组编号与 RTS 帧包含的组编号相同的 MU-MIMO组中的 STA根据预设信息确定其进行 CTS回复的顺序，具体包括： 首要 STA根据预设信息确定其未被指定待进行 CTS回复且相同的相对位 置上不存在其他被指定回复 CTS的 STA时， 首要 STA回复 CTS; 在首要 STA回复 CTS之后，其他待进行 CTS回复的 STA按其在 MU-MIMO 组中的相对位置的先后顺序进行 CTS回复。 本实施例还提供了另一种 CTS回复方法，图 2是本发明实施例提供的第二 种 CTS回复方法的处理流程图， 如图 2所示， 该流程包括如下步骤： 步骤 202、 AP发送 RTS帧至位于与该 AP相关联的 STA, RTS帧中包含 对 RTS帧进行 CTS回复的 MU-MIMO组的组编号，每个 MU-MIMO组包括至 少一个 STA^ 步骤 204、接收 MU-MIMO组的组编号与 RTS帧包含的组编号相同的 STA 回复的 CTS , 其中， CTS回复的顺序根据预设信息确定。 本实施例还提供了另一种 CTS回复方法，图 3是本发明实施例提供的第三 种 CTS回复方法的处理流程图， 如图 3所示， 该流程包括如下步骤： 步骤 302、 STA接收与本 STA相关联的接入点 AP发送的 RTS帧， RTS帧 中包含对 RTS帧进行 CTS回复的 MU-MIMO组的组编号，每个 MU-MIMO组 包括至少一个 STA; 步骤 304、 根据预设信息确定自身进行 CTS回复的顺序， 并在顺序到达时 进行 CTS回复。 为将本发明实施例提供的 CTS回复方法描述地更清楚更明白 ,现以几个优 选实施例进行说明。 优选实施例一： 假定网络中有 1个 AP和与该 AP相关联的 6个 STA, 6个 STA分别表示 为 STA-1 , STA-2, STA-3 , STA-4, STA-5 , STA-6; 每个 MU-MIMO组最多 有 4个 STA组成，不足 4个 STA的 MU-MIMO组仍然被认为由 4个 STA组成， 不足的部分可以认为有虚拟的 STA存在。 AP按照各 STA的信道状态信息将其分为多个 MU-MIMO组， 并将分组信 息通知给相应的 STA, I_定组编号足够多，每一个组编号只指示一个 MU-MIMO 组， 其中一个组为 （STA-2, STA-6, STA-4, STA-1 ), 组编号 GroupID=2, AP 发布此 MU-MIMO分组信息， 信息包含组编号 GroupID=2, 以及按照上面括号 内的顺序 列的 4个 STA的标识符， 支定标识符用各 STA的 MAC地址表示。 由于组编号 GroupID=2只有一个 MU-MIMO组， 回复 CTS的 STA即此分 组中的 STA , 首要 STA第一个回复 CTS , 其余 STA按照组内的相对位置顺序 回复 CTS。 各 STA接收此信息后都进行检测， 但只有 STA-1 , STA-2, STA-4, STA-6 会将此信息作为有用信息，因为在接收到的信息中有与本身相匹配的 STA标识 符， 这四个 STA 从此信息中得到的有用信息有两方面： 1 ) 本身属于组编号 GroupID=2的 MU-MIMO组； 2 )本身在此 MU-MIMO组中的相对位置。 例如， STA- 1 从此信息中得到的信息包括： STA- 1 属于组编号 GroupID=2 的 MU-MIMO组， 同时 STA- 1在此分组中的处于第 4个位置。 当进行此分组的 MU-MIMO数据传输前， AP发送 RTS帧， 其中， RTS帧 负载中的 MAC地址域中的 MAC地址为 STA-6的 MAC地址， 即 STA-6是首 要 STA。在 RTS帧的物理帧头中包含组编号 GroupID=2信息；组编号 GroupID=2 的 MU-MIMO组中的 4个 STA ( STA-2, STA-6, STA-4, STA-1 )检测 RTS帧 后可获得两方面信息： 1 ) 即将传输的数据包属于其所在的 MU-MIMO组； 2 ) STA-6为此次传输的首要 STA; 本优选实施例中， 各 STA确定回复 CTS的顺序的判决过程如下：
• STA-1接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要
STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO组信息， STA-1获 得的有效信息包括： 1 ) 自己处于此分组的第四个位置； 2 ) STA-6处 于此分组的第二个位置； 综合这些信息， 按照本实施例提供的方法， 可得 STA-1需要第四个回复 CTS帧。 · STA-2接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-2 获得的有效信息包括： 1 ) 自己处于此分组的第一个位置； 2 ) STA-6 处于此分组的第二个位置； 综合这些信息，按照本实施例提供的方法， 可得 STA-2需要第二个回复 CTS帧。
• STA-4接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-4 获得的有效信息包括： 1 ) 自己处于此分组的第三个位置； 2 ) STA-6 处于此分组的第二个位置； 综合这些信息，按照本实施例提供的方法， 可得 STA-2需要第三个回复 CTS帧。
• STA-6接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址匹配， 进一步获知自己是首要 STA, 按照本实施例提供的方法， STA-6要第一个回复 CTS帧。
• 其余 STA ( STA-3和 STA-5 )接收到此 RTS帧， 解析此帧物理帧头包 含的组编号信息， 与自己所在的组编号信息不一致， 无需回复 CTS。 最终， 回复 CTS的 STA以及顺序如下：
• 第一个回复 CTS的 STA为首要 STA即 STA-6;
• 第二个回复 CTS的 STA为 STA-2;
• 第三个回复 CTS的 STA为 STA-4;
• 第四个回复 CTS的 STA为 STA-1。 优选实施例二： 假定网络中有 1个 AP和与该 AP相关联的 9个 STA, 9个 STA分别表示 为 STA-1 , STA-2, STA-3 , STA-4, STA-5 , STA-6, STA-7, STA-8, STA-9; 每个 MU-MIMO组最多有 4个 STA组成，不足 4个 STA的 MU-MIMO组仍然 被认为由 4个 STA组成， 不足的部分可以认为有虚拟的 STA存在。 AP按照各 STA的信道状态信息将其分为多个 MU-MIMO组， 并将所有分 组信息通知给 STA, I_定组编号不够多，每一个组编号可以指示多个 MU-MIMO 组， 但有这样一个约束条件， 如果同一个 STA出现在同一个组编号指示的多个 MU-MIMO组中， 那么这个 STA在这些组中的组内相对位置是固定的。 £如本实施例中组编号 GroupID=2 指示三个 MU-MIMO 组， 三个组为 ( STA-5 , STA-6, STA-7, STA-1 ), ( STA-2, STA-6, STA-4, STA-1 ), ( STA-9, STA-6 , STA-4 , STA-1 ), AP 发布 MU-MIMO 分组信息， 信息包含组编号 GroupID=2 , 以及按照上面括号内的顺序 ·ίφ列的 4 个 STA 的标识符， 三个 MU-MIMO分组信息发布的顺序也按照上面所写的顺序。 假定 AP预先规定同一组编号下由第一个发布的 MU-MIMO组的 STA回 复 CTS , 若首要 STA是指定回复 CTS的 STA, 仍然按照在分组内的相对位置 顺序回复 CTS。 各 STA接收此信息后都进行检测， 具体检测结果如下： • STA-l接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 才艮据发布的 MU-MIMO分组 信息， STA-1获得的有效信息： 自己处于第一个 MU-MIMO组中， 且 在 MU-MIMO组处于第四个位置； 按照本实施例提供的方法， STA-1 需要第四个回复 CTS帧。
• STA-2接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 才艮据发布的 MU-MIMO分组 信息， STA-2获得的有效信息： 自己只处于第二个 MU-MIMO组中； 按照本实施例提供的方法， STA-2不需回复 CTS。实施例二中与 STA-2 同样有处理过程的 STA还有 STA-4和 STA-9。
• STA-3接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己不属于此组编号下的 MU-MIMO组， 按照本实施例提供的方法， STA-3 不需要回复 CTS。 实施例二中， 与 STA-3 有同样处理过程的 STA还有 STA-8。
• STA-5接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 才艮据发布的 MU-MIMO分组 信息， STA-5获得的有效信息： 自己处于第一个 MU-MIMO组中， 且 在此 MU-MIMO 组中处于第一个位置； 按照本实施例提供的方法， STA-5需要第一个回复 CTS帧。
• STA-6接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址匹配， 即由此获知自己是首要 STA, 虽然自己是首要 STA, 但是按照本实施例提供的方法， STA-6第二个 回复 CTS帧。
• STA-7接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 才艮据发布的 MU-MIMO分组 信息， STA-7获得的有效信息： 自己处于第一个 MU-MIMO组中， 且 在此 MU-MIMO 组中处于第三个位置； 按照本实施例提供的方法， STA-7需要第三个回复 CTS帧。 最终， 回复 CTS的 STA以及顺序如下： • 第一个回复 CTS的 STA为 STA-5;
• 第二个回复 CTS的 STA为 STA-6;
• 第三个回复 CTS的 STA为 STA-7;
• 第四个回复 CTS的 STA为 STA-1。 优选实施例三 假定网络中有 1个 AP和与该 AP相关联的 9个 STA, 9个 STA分别表示 为 STA-1 , STA-2, STA-3 , STA-4, STA-5 , STA-6, STA-7, STA-8, STA-9; 每个 MU-MIMO组最多有 4个 STA组成，不足 4个 STA的 MU-MIMO组仍然 被认为由 4个 STA组成， 不足的部分可以认为有虚拟的 STA存在。 AP按照各 STA的信道状态信息将其分为多个 MU-MIMO组， 并将所有分 组信息通知给 STA, I_定组编号不够多，每一个组编号可以指示多个 MU-MIMO 组， 但有这样一个约束条件， 如果同一个 STA出现在同一个组编号指示的多个 MU-MIMO组中， 那么这个 STA在这些分组中的组内相对位置是固定的。 £如本实施例中组编号 GroupID=2 指示三个 MU-MIMO 组， 三个组为 ( STA-5 , STA-6, STA-7, STA-1 ), ( STA-2, STA-6, STA-4, STA-1 ), ( STA-9, STA-6 , STA-4 , STA-1 ), AP 发布 MU-MIMO 分组信息， 信息包含组编号 GroupID=2 , 以及按照上面括号内的顺序 ·ίφ列的 4 个 STA 的标识符， 三个 MU-MIMO分组信息发布的顺序也按照上面所写的顺序。 假定 AP预先规定同一组编号下由第一个发布的 MU-MIMO组的 STA回 复 CTS , 若首要 STA是指定回复 CTS的 STA, 则首要 STA第一个回复 CTS。 各 STA接收此信息后都进行检测， 检测结果如下：
• STA-1接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-1 获得的有效信息包括： 1 ) 自 己处于三个 MU-MIMO 组中， 且在 MU-MIMO 组处于第四个位置； 2 ) STA-6 即首要 STA 处于三个 MU-MIMO组中， 且在一个 MU-MIMO组处于第二个位置； 综合这些 信息， 按照本实施例提供的方法， STA- 1需要第四个回复 CTS帧。
STA-2接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-2 获得的有效信息包括： 1 ) 自己只处于第二个 MU-MIMO组中； 按照 本实施例提供的方法， STA-2不需回复 CTS帧。 本实施例中与 STA-2 同样有处理过程的 STA还有 STA-4和 STA-9。
STA-3接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己不属于此组编号下的 MU-MIMO组， 按照本实施例提供的方法， 不需要回复 CTS。 本实施例中， 与 STA-3有同样处理过程的 STA还 有 STA-8。
STA-5接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-5 获得的有效信息包括： 1 ) 自己处于第一个 MU-MIMO组中， 且在此 MU-MIMO 组中处于第一个位置； 2 ) STA-6 即首要 STA 处于三个 MU-MIMO组中， 且在一个 MU-MIMO组处于第二个位置； 综合这些 信息， 按照本实施例提供的方法， STA-5虽然处于第一个组的第一个 位置， 但是其不是首要 STA, 因而需要等待后， 第二个回复 CTS帧。
STA-6接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址匹配， 即由此获知自己是首要 STA, 按照本实施例提供的方法， STA-6第一个回复 CTS帧。
STA-7接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-7 获得的有效信息包括： 1 ) 自己处于第一个 MU-MIMO组中， 且在此 MU-MIMO 组中处于第三个位置； 2 ) STA-6 即首要 STA 处于三个 MU-MIMO组中， 且在一个 MU-MIMO组处于第二个位置； 综合这些 信息， 按照本实施例提供的方法， STA-7需要第三个回复 CTS帧。 最终， 回复 CTS的 STA以及顺序如下： · 第一个回复 CTS的 STA为首要 STA即 STA-6;
• 第二个回复 CTS的 STA为 STA-5;
• 第三个回复 CTS的 STA为 STA-7;
• 第四个回复 CTS的 STA为 STA-1。 优选实施例四： 支定网络中有 1个 AP和与该 AP相关联的 9个 STA, 9个 STA分别表示 为 STA-1 , STA-2, STA-3 , STA-4, STA-5 , STA-6, STA-7, STA-8, STA-9; 每个 MU-MIMO组最多有 4个 STA组成，不足 4个 STA的 MU-MIMO组仍然 被认为由 4个 STA组成， 不足的部分可以认为有虚拟的 STA存在。
AP按照各 STA的信道状态信息将其分为多个 MU-MIMO组， 并将所有分 组信息通知给 STA, I_定组编号不够多，每一个组编号可以指示多个 MU-MIMO 组， 但有这样一个约束条件， 如果同一个 STA出现在同一个组编号指示的多个 MU-MIMO组中， 那么这个 STA在这些组中的组内相对位置是固定的。 £如本实施例中组编号 GroupID=2 指示三个 MU-MIMO 组， 三个组为 ( STA-5 , STA-8, STA-7, STA-1 ), ( STA-2, STA-6, STA-4, STA-1 ), ( STA-9, STA-6 , STA-4 , STA-1 ), AP 发布 MU-MIMO 分组信息， 信息包含组编号 GroupID=2 , 以及按照上面括号内的顺序 ·ίφ列的 4 个 STA 的标识符， 三个 MU-MIMO分组信息发布的顺序也按照上面所写的顺序。 假定 AP预先规定同一组编号下由第一个发布的 MU-MIMO组的 STA回 复 CTS。 若首要 STA不是指定回复 CTS的 STA, 则其无需回复 CTS。 各 STA接收此信息后都进行检测， 检测结果如下：
• STA-1接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-1 获得的有效信息包括： 1 ) 自 己处于三个 MU-MIMO 组中， 且在 MU-MIMO 组处于第四个位置； 2 ) STA-6 即首要 STA 处于两个 MU-MIMO组中， 且在 MU-MIMO组处于第二个位置，但不存在于第 一个 MU-MIMO 组中； 综合这些信息， 按照本实施例提供的方法， STA-1需要第四个回复 CTS帧。
STA-2接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-2 获得的有效信息包括： 1 ) 自己只处于第二个 MU-MIMO组中； 按照 本实施例提供的方法， STA-2不需回复 CTS帧。 本实施例中与 STA-2 同样有处理过程的 STA还有 STA-4和 STA-9。
STA-3接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己不属于此组编号下的 MU-MIMO组， 按照本实施例提供的方法， 不需要回复 CTS。
STA-5接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-5 获得的有效信息包括： 1 ) 自己处于第一个 MU-MIMO组中， 且在处 于 MU-MIMO组中的第一个位置； 2 ) STA-6 即首要 STA处于两个 MU-MIMO分组中， 且在 MU-MIMO分组处于第二个位置， 但不存在 于第一个 MU-MIMO组中；综合这些信息，按照本实施例提供的方法， STA-5需要第一个回复 CTS帧。
STA-6接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址匹配， 即由此获知自己是首要 STA, 才艮据发布的 MU-MIMO分组信息， STA-6不存在于第一个 MU-MIMO 组中， 按照本实施例提供的方法， STA-6无需回复 CTS帧。 • STA-7接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-7 获得的有效信息包括： 1 ) 自己处于第一个 MU-MIMO组中， 且在此
MU-MIMO 组中处于第三个位置； 2 ) STA-6 即首要 STA 处于两个 MU-MIMO分组中， 且在 MU-MIMO分组处于第二个位置， 但不存在 于第一个 MU-MIMO组中；综合这些信息，按照本实施例提供的方法， STA-7需要第三个回复 CTS帧。 · STA-8接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-8 获得的有效信息包括： 1 ) 自己处于第一个 MU-MIMO组中， 且在此 MU-MIMO 组中处于第二个位置； 2 ) STA-6 即首要 STA 处于两个
MU-MIMO组中， 且在 MU-MIMO分组处于第二个位置， 但不存在于 第一个 MU-MIMO组中； 综合这些信息， 按照本实施例提供的方法， STA-8需要第四个回复 CTS帧。。 最终， 回复 CTS的 STA以及顺序如下： · 第一个回复 CTS的 STA为 STA-5;
• 第二个回复 CTS的 STA为 STA-8;
• 第三个回复 CTS的 STA为 STA-7;
• 第四个回复 CTS的 STA为 STA-1。 优选实施例五： 支定网络中有 1个 AP和与该 AP相关联的 9个 STA, 9个 STA分别表示 为 STA-1 , STA-2, STA-3 , STA-4, STA-5 , STA-6, STA-7, STA-8, STA-9; 每个 MU-MIMO分组最多有 4个 STA组成，不足 4个 STA的 MU-MIMO分组 仍然被认为由 4个 STA组成， 不足的部分可以认为有虚拟的 STA存在。 AP按照各 STA的信道状态信息将其分为多个 MU-MIMO组， 并将所有分 组信息通知给 STA, I_定组编号不够多，每一个组编号可以指示多个 MU-MIMO 组， 但有这样一个约束条件， 如果同一个 STA出现在同一个组编号指示的多个 MU-MIMO组中， 那么这个 STA在这些组中的组内相对位置是固定的。 £如本实施例中组编号 GroupID=2 指示三个 MU-MIMO 组， 三个组为 ( STA-5 , STA-8, STA-7, STA-1 ), ( STA-2, STA-6, STA-4, STA-1 ), ( STA-9, STA-6, STA-4, STA-1 ), AP发布 MU-MIMO分组信息， 分组信息包含组编号 GroupID=2 , 以及按照上面括号内的顺序 ·ίφ列的 4 个 STA 的标识符， 三个 MU-MIMO分组信息发布的顺序也按照上面所写的顺序。 假定 AP预先规定同一组编号下由第一个发布的 MU-MIMO组的 STA回 复 CTS ,且首要 STA第一个回复 CTS ,若首要 STA不是指定回复 CTS的 STA, 要从指定回复 CTS的 STA中， 剔除与首要 STA占据相同分组位置的 STA。 各 STA接收此信息后都进行检测， 检测结果如下：
• STA-1接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-1 获得的有效信息包括： 1 ) 自 己处于三个 MU-MIMO 组中， 且在 MU-MIMO 组处于第四个位置； 2 ) STA-6 即首要 STA 处于两个 MU-MIMO组中， 且在 MU-MIMO组处于第二个位置，但不存在于第 一个 MU-MIMO 组中； 综合这些信息， 按照本实施例提供的方法， STA-1需要第四个回复 CTS帧。
• STA-2接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-2 获得的有效信息包括： 1 ) 自己只处于第二个 MU-MIMO组中； 按照 本实施例提供的方法， STA-2不需回复 CTS帧。本实施例中域与 STA-2 同样有处理过程的 STA还有 STA-4和 STA-9。 STA-3接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己不属于此组编号下的 MU-MIMO组， 按照本实施例提供的方法， 不需要回复 CTS。
STA-5接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-5 获得的有效信息包括： 1 ) 自己处于第一个 MU-MIMO组中， 且在处 于 MU-MIMO组中的第一个位置； 2 ) STA-6 即首要 STA处于两个 MU-MIMO组中， 且在 MU-MIMO组处于第二个位置，但不存在于第 一个 MU-MIMO 组中； 综合这些信息， 按照本实施例提供的方法， STA-5虽然处于第一个分组的第一个位置， 但是其不是首要 STA, 因 而需要等待后第二个回复 CTS帧。
STA-6接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址匹配， 即由此获知自己是首要 STA, 按照本实施例提供的方法， 虽然 STA-6 不存在于第一个 MU-MIMO 组中， 但 STA-6是首要 STA, 故 STA-6第一个回复 CTS帧。
STA-7接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-7 获得的有效信息包括： 1 ) 自己处于第一个 MU-MIMO组中， 且在此 MU-MIMO 组中处于第三个位置； 2 ) STA-6 即首要 STA 处于两个 MU-MIMO组中， 且在 MU-MIMO分组处于第二个位置， 但不存在于 第一个 MU-MIMO组中； 综合这些信息， 按照本实施例提供的方法， STA-7需要第三个回复 CTS帧。
STA-8接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-8 获得的有效信息包括： 1 ) 自己处于第一个 MU-MIMO组中， 且在此 MU-MIMO 组中处于第二个位置； 2 ) STA-6 即首要 STA 处于两个 MU-MIMO组中， 且在 MU-MIMO组处于第二个位置，但不存在于第 一个 MU-MIMO组中； 综合这些信息， 按照本实施例提供的方法， 虽 然 STA-8处于第一个 MU-MIMO组中， 但其在分组中的相对位置与 首要 STA-6在其所在分组内的相对位置重复，故 STA-8不能回复 CTS 帧。 最终， 回复 CTS的 STA以及顺序如下：
• 第一个回复 CTS的 STA为首要 STA即 STA-6;
• 第二个回复 CTS的 STA为 STA-5; · 第三个回复 CTS的 STA为 STA-7;
• 第四个回复 CTS的 STA为 STA-1。 优选实施例六： 假定网络中有 1个 AP和与该 AP相关联的 9个 STA, 9个 STA分别表示 为 STA-1 , STA-2, STA-3 , STA-4, STA-5 , STA-6, STA-7, STA-8, STA-9; 每个 MU-MIMO组最多有 4个 STA组成，不足 4个 STA的 MU-MIMO组仍然 被认为由 4个 STA组成， 不足的部分可以认为有虚拟的 STA存在。
AP按照各 STA的信道状态信息将其分为多个 MU-MIMO组， 并将所有分 组信息通知给 STA, I_定组编号不够多，每一个组编号可以指示多个 MU-MIMO 组， 但有这样一个约束条件， 如果同一个 STA出现在同一个组编号指示的多个 MU-MIMO组中， 那么 STA在这些分组中的组内相对位置是固定的。 £如本实施例中组编号 GroupID=2 指示三个 MU-MIMO 组， 三个组为 ( STA-5 , STA-8, STA-7, STA-1 ), ( STA-2, STA-6, STA-4, STA-1 ), ( STA-9, STA-6, STA-4, STA-1 ), AP发布 MU-MIMO分组信息， 分组信息包含组编号 GroupID=2 , 以及按照上面括号内的顺序 ·ίφ列的 4 个 STA 的标识符， 三个 MU-MIMO分组信息发布的顺序也按照上面所写的顺序。 假定 AP预先规定同一组编号下由第一个发布的 MU-MIMO组的 STA回 复 CTS ,且首要 STA第一个回复 CTS ,若首要 STA不是指定回复 CTS的 STA, 则指定回复 CTS的 STA, 在首要 STA回复 CTS之后， 再按照在分组中的位置 顺序回复 CTS。 各 STA接收此信息后都进行检测， 检测结果如下：
• STA-1接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-1 获得的有效信息包括： 1 ) 自 己处于三个 MU-MIMO 组中， 且在 MU-MIMO 组处于第四个位置； 2 ) STA-6 即首要 STA 处于两个 MU-MIMO组中， 且在 MU-MIMO组处于第二个位置，但不存在于第 一个 MU-MIMO 组中； 综合这些信息， 按照本实施例提供的方法， STA-1需要第五个回复 CTS帧。
• STA-2接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-2 获得的有效信息包括： 1 ) 自己只处于第二个 MU-MIMO组中； 按照 本实施例提供的方法， STA-2不需回复 CTS帧。本实施例中域与 STA-2 同样有处理过程的 STA还有 STA-4和 STA-9。
• STA-3接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己不属于此组编号下的 MU-MIMO组， 按照本实施例提供的方法， 不需要回复 CTS。
• STA-5接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧 MAC帧头中接收地 址域包含的 MAC地址， 此地址与自己的 MAC地址不匹配， 进一步 获知自己不是首要 STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO 分组信息， STA-5获得的有效信息包括： 1 )自己处于第一个 MU-MIMO 组中，且在处于 MU-MIMO组中的第一个位置； 2 ) STA-6即首要 STA 处于两个 MU-MIMO组中， 且在 MU-MIMO组处于第二个位置， 但 不存在于第一个 MU-MIMO组中； 综合这些信息， 按照本实施例提供 的方法， STA-5 虽然处于第一个组的第一个位置， 但是其不是首要 STA, 因而需要等待后第二个回复 CTS帧。
• STA-6接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址匹配， 即由此获知自己是首要 STA, 按照本实施例提供的方法， 虽然 STA-6 不存在于第一个 MU-MIMO 组中， 但 STA-6是首要 STA, 故 STA-6第一个回复 CTS帧。
• STA-7接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要
STA, 首要 STA是 STA-6; 根据发布的 MU-MIMO分组信息， STA-7 获得的有效信息包括： 1 ) 自己处于第一个 MU-MIMO组中， 且在此 MU-MIMO 组中处于第三个位置； 2 ) STA-6 即首要 STA 处于两个 MU-MIMO组中， 且在 MU-MIMO组处于第二个位置，但不存在于第 一个 MU-MIMO 组中； 综合这些信息， 按照本实施例提供的方法，
STA-7需要第四个回复 CTS帧。
• STA-8接收到 RTS帧， 解析此帧， 通过帧头包含的组编号信息， 获知 自己属于此组编号下的 MU-MIMO组， 解析此帧帧负载包含的 MAC 地址， 此地址与自己的 MAC地址不匹配， 进一步获知自己不是首要 STA, 首要 STA是 STA-6; 才艮据发布的 MU-MIMO分组信息， STA-8 获得的有效信息包括： 1 ) 自己处于第一个 MU-MIMO组中， 且在此 MU-MIMO 组中处于第二个位置； 2 ) STA-6 即首要 STA 处于两个 MU-MIMO组中， 且在 MU-MIMO组处于第二个位置，但不存在于第 一个 MU-MIMO 组中； 综合这些信息， 按照本实施例提供的方法， STA-8需要第三个回复 CTS帧。 最终， 回复 CTS的 STA以及顺序如下：
• 第一个回复 CTS的 STA为首要 STA即 STA-6;
• 第二个回复 CTS的 STA为 STA-5;
• 第三个回复 CTS的 STA为 STA-8; • 第四个回复 CTS的 STA为 STA-7;
• 第五个回复 CTS的 STA为 STA-1。 本实施例还提供了一种 CTS回复系统， 具体结构如图 4所示， 包括接入点 AP401和与 AP401相关联的站点 STA402: AP 401 , 设置为发送请求发送 RTS帧， RTS帧中包含对 RTS帧进行 CTS 回复的多用户多输入多输出 MU-MIMO组的组编号， 每个 MU-MIMO组包括 至少一个 STA; 以及， 接收所在 MU-MIMO组的组编号与 RTS帧包含的组编 号相同的 STA回复的 CTS;
STA 402, 设置为接收 RTS帧； 以及， 根据预设信息确定自身进行 CTS回 复的顺序， 并在顺序到达时进行 CTS回复。 作为一个优选实施方式， 在本实施例中， AP 401还可以设置为对与其相关 联的 STA 402进行 MU-MIMO分组， 并为每个 MU-MIMO组指定一个组编号； 以及 将 MU-MIMO 分组信息通知给与 AP 401 相关联的 STA 402 , 其中， MU-MIMO分组信息包括组编号、 该组编号对应的所有 MU-MIMO组以及各 STA 402在每个 MU-MIMO组内的相对位置信息。 作为一个优选实施方式， 在本实施例中， AP 401还可以设置为根据与其相 关联的 STA的信道状态信息、数据业务量、数据业务类型中的任意一项或多项 属性的组合， 对与其相关联的 STA进行 MU-MIMO分组。 作为一个优选实施方式， 在本实施例中， AP 401还可以设置为将同一个组 号分配给至少一个 MU-MIMO分组。 作为一个优选实施方式， 在本实施例中， STA 402还可以设置为： 确定各 待进行 CTS回复的 STA在组编号与 RTS帧包含的组编号相同的 MU-MIMO组 中占据不同相对位置。 作为一个优选实施方式， 在本实施例中， STA 402还可以设置为： 按照各 待回复 CTS的 STA在 MU-MIMO组中的相对位置的先后顺序进行 CTS回复。 作为一个优选实施方式， 在本实施例中， AP 401还可以设置为： 发送还包 含 MAC帧头中接收地址域 载的多址接入信道 MAC地址所标识的首要 STA 的 RTS帧。 作为一个优选实施方式， 在本实施例中， STA 402还可以设置为： 根据预 设信息确定首要 STA被指定待进行 CTS回复时，令首要 STA回复 CTS; 以及， 在首要 STA回复 CTS之后，令其他待进行 CTS回复的 STA按其在 MU-MIMO 组中的相对位置的先后顺序进行 CTS回复。 作为一个优选实施方式， 在本实施例中，， STA 402还可以设置为： 根据预 设信息确定首要 STA未被指定进行 CTS回复时， 令首要 STA回复 CTS , 并禁 止与首要 STA相对位置相同的其他指定的待进行 CTS 回复的 STA进行 CTS 回复； 以及， 在首要 STA回复 CTS之后， 除首要 STA以及被禁止回复 CTS 的 STA之外的其他待进行 CTS回复的 STA按其在 MU-MIMO组中的相对位置 的先后顺序进行 CTS回复。 在一个实施例中， STA 402还可以设置为： 居预设信息确定首要 STA未 被指定进行 CTS回复且相同的相对位置上不存在其他被指定回复 CTS的 STA 时， 令首要 STA回复 CTS; 以及， 在首要 STA回复 CTS之后， 令其他待进行 CTS回复的 STA按其在 MU-MIMO组中的相对位置的先后顺序进行 CTS回复。 在上述实施例中， AP发送 RTS帧至与该 AP相关联的 STA, STA选择组 编号与 RTS帧包含的组编号相同的 MU-MIMO组中的 STA根据预设信息确定 进行 CTS回复的顺序， 并按照确定的顺序进行 CTS回复。 通过上述实施例， RTS/CTS 交换不需要使用特定的信令控制， 而是通过确定 CTS 回复的顺序避 免信道的争抢及碰撞， 能够节省大量资源， 提高控制的安全性。 较优地， 当 AP通过 RTS帧指定首要 STA时， 令首要 STA优先回复 CTS , 保证首要 STA的服务获得优先保障。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可以 用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布在多 个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行的程序代码 来实现， 从而， 可以将它们存储在存储装置中由计算装置来执行， 并且在某些 情况下， 可以以不同于此处的顺序执行所示出或描述的步骤， 或者将它们分别 制作成各个集成电路模块， 或者将它们中的多个模块或步骤制作成单个集成电 路模块来实现。 这样， 本发明不限制于任何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领 域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的 ^"神和原则 之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之 内。

Claims

权 利 要 求 书
1. 一种允许发送 CTS回复方法， 包括：
接入点 AP发送请求发送 RTS帧， 所述 RTS帧中包含多用户多输入 多输出 MU-MIMO组的组编号， 每个 MU-MIMO组包括至少一个站点 STA;
所在 MU-MIMO组的组编号与所述 RTS帧包含的组编号相同、且才艮 据预设信息确定需要回复 CTS 的 STA 按照所述预设信息确定其回复 CTS的顺序， 并依据确定的顺序依次回复 CTS。
2. 根据权利要求 1所述的方法， 其中， 所述 AP发送 RTS帧之前， 还包括： 所述 AP对所述 STA进行 MU-MIMO分组， 并为每个 MU-MIMO 组指定一个组编号， 其中， 所述 STA为与所述 AP相关联的 STA; 以及 将 MU-MIMO分组信息通知给所述 STA, 其中， 所述 MU-MIMO 分组信息包括组编号、 该组编号对应的所有 MU-MIMO 组以及各 STA 在每个 MU-MIMO组内的相对位置信息。
3. 才艮据权利要求 2所述的方法，其中，所述 AP对所述 STA进行 MU-MIMO 分组， 包括：
所述 AP 居所述 STA的信道状态信息、 数据业务量、 数据业务类 型中的任意一项或多项属性的组合， 对所述 STA进行 MU-MIMO分组。
4. 根据权利要求 2所述的方法， 其中， 所述为每个 MU-MIMO组指定一个 组编号， 包括： 将同一个组号分配给至少一个 MU-MIMO分组， 此时每 个 MU-MIMO分组中的 STA的相对位置是固定的。
5. 根据权利要求 1所述的方法， 其中， 进行 CTS回复的 STA在所述组编 号与所述 RTS 帧包含的组编号相同的 MU-MIMO组中占据不同相对位 置。
6. 根据权利要求 1所述的方法， 其中， 所述 RTS帧中还包含： MAC帧头 中接收地址域承载的媒体访问控制 MAC地址所标识的首要 STA。
7. 才艮据权利要求 5或 6所述的方法， 其特征在于， 所在 MU-MIMO组的组 编号与所述 RTS 帧包含的组编号相同、 且根据预设信息确定需要回复 CTS的 STA按照所述预设信息确定其回复 CTS的顺序， 包括：
待进行 CTS回复的 STA按照其在 MU-MIMO组中的相对位置的先 后顺序进行 CTS回复。
8. 根据权利要求 6所述的方法， 其中， 所在 MU-MIMO组的组编号与所述 RTS 帧包含的组编号相同、 且根据预设信息确定需要回复 CTS 的 STA 按照所述预设信息确定其回复 CTS的顺序， 包括：
所述首要 STA根据所述预设信息确定其被指定待进行 CTS回复时， 回复 CTS;
在所述首要 STA回复 CTS之后， 其他待进行 CTS回复的 STA按其 在 MU-MIMO组中的相对位置的先后顺序进行 CTS回复。
9. 根据权利要求 6所述的方法， 其中， 所在 MU-MIMO组的组编号与所述 RTS 帧包含的组编号相同、 且根据预设信息确定需要回复 CTS 的 STA 按照所述预设信息确定其回复 CTS的顺序， 包括：
所述首要 STA根据所述预设信息确定其未被指定进行 CTS回复时， 回复 CTS , 并禁止与所述首要 STA相对位置相同的其他指定的待进行 CTS回复的 STA进行 CTS回复；
在所述首要 STA回复 CTS之后， 除所述首要 STA以及被禁止回复 CTS的 STA之外的其他待进行 CTS回复的 STA按其在 MU-MIMO组中 的相对位置的先后顺序进行 CTS回复。
10. 根据权利要求 6所述的方法， 其中， 所在 MU-MIMO组的组编号与所述 RTS 帧包含的组编号相同、 且根据预设信息确定需要回复 CTS 的 STA 按照所述预设信息确定其回复 CTS的顺序， 包括：
所述首要 STA根据所述预设信息确定其未被指定待进行 CTS 回复 且相同的相对位置上不存在其他被指定回复 CTS 的 STA时， 所述首要 STA回复 CTS;
在所述首要 STA回复 CTS之后， 其他待进行 CTS回复的 STA按其 在 MU-MIMO组中的相对位置的先后顺序进行 CTS回复。
11. 一种允许发送 CTS回复方法， 包括： 接入点 AP发送请求发送 RTS帧， 所述 RTS帧中包含多用户多输入 多输出 MU-MIMO组的组编号， 每个 MU-MIMO组包括至少一个 STA; 以及
接收到所在 MU-MIMO组的组编号与所述 RTS 帧包含的组编号相 同、 且根据预设信息确定需要回复 CTS的 STA回复的 CTS , 其中， CTS 回复的顺序根据预设信息确定。
12. 一种允许发送 CTS回复方法， 包括：
站点 STA接收与所述 STA相关联的接入点 AP发送的请求发送 RTS 帧， 所述 RTS帧中包含对所述 RTS帧进行 CTS回复的多用户多输入多 输出 MU-MIMO组的组编号， 每个 MU-MIMO组包括至少一个 STA; 以及
根据预设信息确定自身进行 CTS回复的顺序， 并在所述顺序到达时 进行 CTS回复。
13. —种允许发送 CTS回复系统， 包括接入点 AP和站点 STA:
所述 AP, 设置为发送请求发送 RTS帧， 所述 RTS帧中包含多用户 多输入多输出 MU-MIMO组的组编号， 每个 MU-MIMO组包括至少一 个 STA; 以及， 接收所在 MU-MIMO组的组编号与所述 RTS帧的组编 号相同的 STA回复的 CTS;
所述 STA, 设置为接收所述 RTS帧； 以及， 根据预设信息确定自身 需要进行 CTS回复以及进行 CTS回复的顺序， 并在所述顺序到达时进 行 CTS回复。
14. 根据权利要求 13所述的系统， 其中， 所述 AP还设置为对所述 STA进行 MU-MIMO分组， 并为每个 MU-MIMO组指定一个组编号， 其中， 所述 STA为与所述 AP ^目关联的 STA; 以及
将 MU-MIMO分组信息通知给所述 STA, 其中， 所述 MU-MIMO 分组信息包括组编号、 该组编号对应的所有 MU-MIMO 组以及各 STA 在每个 MU-MIMO组内的相对位置信息。
15. 根据权利要求 14所述的系统， 其中， 所述 AP还设置为根据所述 STA的 信道状态信息、 数据业务量、 数据业务类型中的任意一项或多项属性的 组合， 对与其相关联的 STA进行 MU-MIMO分组。
16. 根据权利要求 14所述的系统， 其特征在于， 所述 AP还设置为将同一个 组号分配给至少一个 MU-MIMO分组。
17. 根据权利要求 13所述的系统， 其中， 所述 STA还设置为： 确定各待进 行 CTS 回复的 STA在所述组编号与所述 RTS 帧包含的组编号相同的 MU-MIMO组中占据不同相对位置。
18. 根据权利要求 17所述的系统， 其中， 所述 STA还设置为： 按照各待回 复 CTS的 STA在 MU-MIMO组中的相对位置的先后顺序进行 CTS回复。
19. 根据权利要求 13 所述的系统， 其中， 所述 AP还设置为： 发送还包含 MAC 帧头中接收地址域承载的媒体访问控制 MAC 地址所标识的首要 STA的 RTS帧。
20. 根据权利要求 19所述的系统， 其中， 所述 STA还设置为： 根据所述预 设信息确定所述首要 STA被指定待进行 CTS回复时， 令所述首要 STA 回复 CTS; 以及， 在所述首要 STA回复 CTS之后， 令其他待进行 CTS 回复的 STA按其在 MU-MIMO组中的相对位置的先后顺序进行 CTS回 复。
21. 根据权利要求 19所述的系统， 其中， 所述 STA还设置为： 根据所述预 设信息确定所述首要 STA未被指定进行 CTS回复时， 令所述首要 STA 回复 CTS , 并禁止与所述首要 STA 相对位置相同的其他指定的待进行 CTS回复的 STA进行 CTS回复；以及，在所述首要 STA回复 CTS之后， 除所述首要 STA以及被禁止回复 CTS的 STA之外的其他待进行 CTS回 复的 STA按其在 MU-MIMO组中的相对位置的先后顺序进行 CTS回复。
22. 根据权利要求 19所述的系统， 其中， 所述 STA还设置为： 根据所述预 设信息确定所述首要 STA未被指定进行 CTS 回复且相同的相对位置上 不存在其他被指定回复 CTS的 STA时， 令所述首要 STA回复 CTS; 以 及， 在所述首要 STA回复 CTS之后， 令其他待进行 CTS回复的 STA按 其在 MU-MIMO组中的相对位置的先后顺序进行 CTS回复。
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017067253A1 (zh) * 2015-10-23 2017-04-27 华为技术有限公司 基于业务类型指示的确认方法及装置
CN109245859A (zh) * 2013-10-01 2019-01-18 交互数字专利控股公司 支持ul mu分集的接入点及针对ul mu分集的方法
US11528723B2 (en) 2012-03-01 2022-12-13 Interdigital Patent Holdings, Inc. Multi-user parallel channel access in WLAN systems

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104010378B (zh) * 2013-02-25 2018-05-04 华为技术有限公司 无线局域网访问方法、接入点及无线局域网系统
WO2015066846A1 (zh) * 2013-11-05 2015-05-14 华为技术有限公司 一种数据通信的方法、站点及系统
US10149284B2 (en) * 2015-02-05 2018-12-04 Qualcomm Incorporated Systems and methods for group block acknowledgment transmissions

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1771697A (zh) * 2003-12-26 2006-05-10 松下电器产业株式会社 无线访问系统
CN101521586A (zh) * 2008-02-28 2009-09-02 株式会社Ntt都科摩 在无线局域网中的多播方法
WO2010044624A2 (en) * 2008-10-15 2010-04-22 Lg Electronics Inc. Method for multicast frame transmission and duplicated multicast frame detection
US20100182987A1 (en) * 2009-01-16 2010-07-22 Electronics And Telecommunications Research Institute Method and apparatus for transmitting/receiving data in wireless communication network

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1771697A (zh) * 2003-12-26 2006-05-10 松下电器产业株式会社 无线访问系统
CN101521586A (zh) * 2008-02-28 2009-09-02 株式会社Ntt都科摩 在无线局域网中的多播方法
WO2010044624A2 (en) * 2008-10-15 2010-04-22 Lg Electronics Inc. Method for multicast frame transmission and duplicated multicast frame detection
US20100182987A1 (en) * 2009-01-16 2010-07-22 Electronics And Telecommunications Research Institute Method and apparatus for transmitting/receiving data in wireless communication network

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11528723B2 (en) 2012-03-01 2022-12-13 Interdigital Patent Holdings, Inc. Multi-user parallel channel access in WLAN systems
US11770819B2 (en) 2012-03-01 2023-09-26 Interdigital Patent Holdings, Inc. Multi-user parallel channel access in WLAN systems
CN109245859A (zh) * 2013-10-01 2019-01-18 交互数字专利控股公司 支持ul mu分集的接入点及针对ul mu分集的方法
CN109245859B (zh) * 2013-10-01 2021-06-29 交互数字专利控股公司 支持ul mu分集的接入点及针对ul mu分集的方法
US11153908B2 (en) 2013-10-01 2021-10-19 Interdigital Patent Holdings, Inc. Enhancements for resource allocation in WLAN systems
US11792854B2 (en) 2013-10-01 2023-10-17 Interdigital Patent Holdings, Inc. Enhancements for resource allocation in WLAN systems
WO2017067253A1 (zh) * 2015-10-23 2017-04-27 华为技术有限公司 基于业务类型指示的确认方法及装置

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