WO2017031628A1 - 一种数据传输控制方法及接入点、站点 - Google Patents

一种数据传输控制方法及接入点、站点 Download PDF

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Publication number
WO2017031628A1
WO2017031628A1 PCT/CN2015/087787 CN2015087787W WO2017031628A1 WO 2017031628 A1 WO2017031628 A1 WO 2017031628A1 CN 2015087787 W CN2015087787 W CN 2015087787W WO 2017031628 A1 WO2017031628 A1 WO 2017031628A1
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field
control frame
frame
access point
duration
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PCT/CN2015/087787
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English (en)
French (fr)
Inventor
马驰翔
林英沛
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华为技术有限公司
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Priority to CN201580078265.6A priority Critical patent/CN107409431B/zh
Priority to PCT/CN2015/087787 priority patent/WO2017031628A1/zh
Publication of WO2017031628A1 publication Critical patent/WO2017031628A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present application relates to the field of communications, and in particular, to a data transmission control method, an access point, and a station.
  • the transmitting end in order to protect the data frame from the interference between the transmitting end and the receiving end, as shown in Figure 1, sends the data frame before the transmitting end sends the data frame.
  • Request to Send (Control) frame after receiving the RTS, the receiving end replies with a Clear to Send (Control Response) frame, and carries a Duration Duration field in both the RTS and the CTS to inform the receiving end.
  • the duration of the protection required for the data transmission process between the sender and the sender, the duration of the protection is not less than the duration of the data transmission process between the receiver and the sender, and other stations except the sender and the receiver are based on the Duration field.
  • set the respective Network Allocation Vector (NAV) NAV is used for the station to remain silent during the data transmission between the sender and the receiver.
  • NAV Network Allocation Vector
  • the above interference avoidance mechanism allows only one STA to access the AP and transmit data in the same period of time. Therefore, the interference is avoided at the cost of bandwidth utilization. Therefore, how to improve bandwidth utilization under the premise of avoiding interference has become an urgent problem to be solved.
  • the present application provides a data transmission control method, an access point, and a site, and aims to solve the problem of how to improve bandwidth utilization under the premise of avoiding interference.
  • a first aspect of the present application provides a data transmission control method, including:
  • the access point sends a first control frame, where the first control frame includes a first duration field and carries an identifier of a basic service set, where the value of the first duration field is used to indicate the access point and the basic service set
  • the second aspect of the present application provides another data transmission control method, including:
  • the station replies to the access point with a second control frame, where the second control frame carries an identifier of the basic service set;
  • the station If the station is not within the basic service set and is causing interference to data transmissions within the basic service set, the station updates the NAV based at least on the value of the first Duration field.
  • a third aspect of the present application provides another data transmission control method, including:
  • the station Receiving, by the station, a first control frame sent by the access point, where the first control frame includes a first Duration field and carries an identifier of the basic service set and an identifier of the station in the basic service set;
  • the station replies to the access point with a second control frame, where the second control frame carries The identifier of the basic service set;
  • the station updates the NAV according to at least the value of the first Duration field.
  • a fourth aspect of the present application provides an access point, including:
  • a first sending module configured to send a first control frame after the acknowledgment channel is idle, where the first control frame includes a first duration field and carries an identifier of a basic service set, where the value of the first duration field is used to indicate Determining the length of protection required for data transmission between the access point and the stations in the basic service set;
  • a data transmission module configured to: if the identifier of the basic service set carried by the second control frame fed back by the site is the same as the identifier of the basic service set carried by the first control frame, perform data transmission with the site.
  • a fifth aspect of the present application provides a site comprising:
  • a first receiving module configured to receive a first control frame sent by an access point, where the first control frame includes a first Duration field and carries an identifier of a basic service set;
  • a first processing module configured to: when the site is in the basic service set, reply a second control frame to the access point, where the second control frame carries an identifier of the basic service set; If the site is not in the basic service set and interferes with data transmission within the basic service set, the NAV is updated based at least on the value of the first Duration field.
  • a sixth aspect of the present application provides yet another site, including:
  • a second receiving module configured to receive a first control frame sent by the access point, where the first control frame includes a first Duration field and carries an identifier of the basic service set and an identifier of the site in the basic service set;
  • a second processing module configured to: when the site is in the basic service set, and the identifier of the site is carried in the first control frame, return a second control frame to the access point, where The second control frame carries the identifier of the basic service set; if the site is in the basic service set but the identifier of the site is not carried in the first control frame, at least according to the first Duration field Value, update NAV.
  • the access point after the acknowledgment channel is idle, the access point sends a control first control frame, where the frame format of the first control frame based on the medium access control MAC layer protocol includes a first Duration field and carries a basic service set.
  • the identifier after receiving the first control frame, if the site is in the basic service set, the site replies with a second control frame to the access point, and the second control frame carries the identifier of the basic server, and accesses
  • the point After receiving the second control frame, the point performs data transmission with the station. If the station is not in the basic service set and interferes with data transmission in the basic service set, the station updates the NAV according to the value of the first Duration field;
  • the first control frame includes a first duration field in the frame format of the medium access control MAC layer protocol, and carries an identifier of the basic service set and an identifier of the station in the basic service set, after the station receives the first control frame, If the site is in the basic service set and the identifier of the site is carried in the first control frame, the site replies with the second control frame to the access point, and the second control frame carries the identifier of the basic server, if the site is at Within the basic service set but whose identity is not carried in the first control frame, or not in the basic service set and for the basic service set If the data transmission within the interference causes interference, the station updates the NAV according to at least the value of the first Duration field.
  • the NAV can keep the site silent during the data transmission process between the access point and other sites in the basic service set, it can evade interference, and because the access point allows sites in the basic service set to participate in the communication, There are usually multiple sites in a basic service set, so in a period of time, not only one site can transmit data, which can improve bandwidth utilization.
  • 1 is a schematic diagram of data transmission of a transmitting node and a receiving node in a WLAN system
  • FIG. 2 is a schematic diagram of a communication scenario of a WLAN
  • FIG. 3 is a flowchart of a data transmission control method according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a frame structure of a first type control frame based on a MAC layer protocol according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of a frame structure of a first type control frame and a second type first control frame according to a physical layer protocol according to an embodiment of the present disclosure
  • FIG. 7 is a schematic diagram of a frame structure of a second control frame according to a MAC layer protocol according to an embodiment of the present disclosure
  • FIG. 8 is a schematic diagram of a frame structure of a second control frame shown in FIG. 7 based on a physical layer protocol
  • FIG. 9 is a flowchart of still another data transmission control method according to an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a frame structure of a second type first control frame based on a MAC layer protocol according to an embodiment of the present disclosure
  • FIG. 11 is a flowchart of still another data transmission control method disclosed in the embodiment of the present application.
  • FIG. 13 is a schematic diagram of still another frame structure of the second control frame shown in FIG. 7 based on a physical layer protocol;
  • FIG. 14 is a flowchart of still another data transmission control method according to an embodiment of the present application.
  • FIG. 15 is a schematic diagram of still another frame structure of a second control frame according to a MAC layer protocol according to an embodiment of the present disclosure
  • FIG. 16 is a schematic structural diagram of an access point according to an embodiment of the present disclosure.
  • FIG. 17 is a schematic structural diagram of a station according to an embodiment of the present disclosure.
  • FIG. 18 is a schematic structural diagram of still another station disclosed in the embodiment of the present application.
  • the embodiment of the present application discloses a data transmission control method, an access point, and a site.
  • the access point and the site described in the embodiment of the present application have new functions compared to the prior art, and the present application implements
  • the access points and stations described in the examples can be applied to existing WLAN systems, that is, compatible with devices in existing WLAN systems.
  • the WLAN system includes an access point and multiple sites.
  • the High Efficiency WLAN HEW-AP is implemented for the present application.
  • the disclosed access point, the HEW-STA is the site disclosed in the embodiment of the present application, and the legacy (STA)-STA is a traditional site, and the site can be converted between the HEW and the legacy mode.
  • a data transmission control method disclosed in the embodiment of the present application describes a process in which an AP competes successfully and instructs a STA to perform data transmission, including the following steps:
  • Step 1 The HEW-AP listening channel
  • the HEW-AP listens to the channel and attempts to transmit a second type of first control frame (also referred to as MU-RTS) when the channel is idle.
  • MU-RTS a second type of first control frame
  • Each MU-RTS occupies a bandwidth of 20 MHz.
  • Step 2 The HEW-AP successfully sends a second type of first control frame (also referred to as MU-RTS);
  • the HEW-AP competes for the channel and successfully transmits the MU-RTS.
  • the MU-RTS differs from the traditional RTS frame in format and content.
  • the frame format of the physical layer is shown in Figure 6.
  • the frame format of the MAC is shown in Figure 10. The assignment and meaning of each part are as follows:
  • Frame Control Different from the traditional RTS in subtype value, for example, 0101 (this value can be defined as other unused values); or different from the traditional RTS in the protocol version, for example, 01 (only used in existing standards) 00, so it can be written as a value other than 00; and bit 8 to bit 15 are redefined as BSS color to indicate the information of the BSS.
  • Duration Sets the duration of subsequent data transmission + 3 times SIFS + CTS duration + duration of data trigger frame; traditional STAs and HEW-STAs not scheduled in MU-RTS will update NAV according to this value, and MU-RTS The HEW-STA scheduled in the medium determines the size of the data transmission by this value;
  • TA Redefined as 4 partial association identifiers (PAIDs) for receiving uplink transmitting STAs, where the PAID is 12 bits, and are sequentially arranged (numbered sequentially, 1, 2, 3, 4), and 4 PAIDs are 48 bits in total.
  • PAIDs partial association identifiers
  • RA Redefined as 4 partial association identifiers (PAIDs) for receiving uplink transmitting STAs, where the PAID is 12 bits, and are sequentially arranged (numbered sequentially, 5, 6, 7, 8), and 4 PAIDs are 48 bits in total.
  • PAIDs partial association identifiers
  • FCS Set in the same way as traditional RTS.
  • Protocol version is used to set the protocol version.
  • Type value is used to set the approximate type of the frame.
  • Subtype value is used to set the specific type of frame.
  • BSS color is used to set the identification information of the BSS.
  • Duration Used to set the length of time required for protection.
  • the MAC address of the transmitting node is set in the prior art, for a total of 48 bits. In this solution, it is used to set the partial association identifiers of the first 4 STAs.
  • the MAC address of the receiving node is set in the prior art, for a total of 48 bits. In this solution, it is used to set the partial association identifiers of the last 4 STAs.
  • FCS As in the prior art, the CRC check bit information is used to verify whether the frame of the MAC layer is correct or not.
  • Step 3 After receiving the MU-RTS, the HEW-STA sends a second control frame according to the PAID indication, or updates the NAV.
  • the HEW-STA receives the MU-RTS sent by the HEW-AP, determines whether it is the current BSS according to the BSS color indicated in the HEW-RTS, and determines whether it is necessary to reply to the second control frame according to the PAID indicated therein. If it is determined that the second control frame is not to be replied, the NAV is updated according to the duration in the MU-RTS.
  • the format of the second control frame may be as shown in FIG. 13 (the second control frame shown in FIG. 13 may also be referred to as MU-CTS), so that the HEW-AP knows which HEW-STA replies the second control frame; As shown in FIG. 8 (the second control frame shown in FIG. 8 may also be referred to as eCTS), there is no need for the HEW-AP to distinguish which HEW-STA replies the second control frame.
  • All HEW-STAs reply to the second control frame of the same format, that is, either return the second control frame as shown in FIG. 13, or both return the second control frame as shown in FIG.
  • the frame structure of the second control frame based on the MAC layer protocol is as shown in FIG.
  • the MU-CTS consists of a newly added OFDM symbol and a conventional CTS, and the newly added OFDM symbol and the conventional CTS are both separate PHY layer frames as shown in FIG.
  • the frame format of the physical layer is shown in Figure 8.
  • the frame format of the MAC is shown in Figure 9. The assignment and meaning of each part are as follows:
  • Frame Control Different from the traditional CTS in the subtype value, it is 0100 (this value can be defined as other unused values); or it is different from the traditional RTS in the protocol version, for example, 01 (only 00 is used in the existing standard) Therefore, it can be written as a value other than 00; and bit 8 to bit 15 are redefined as BSS color to indicate the information of the BSS.
  • Duration Set to duration in RTS minus SIFS minus CTS duration; traditional STAs and HEW-STAs not scheduled in MU-RTS will update NAV according to this value, and HEW-STA scheduled in MU-RTS Then use this value to determine the size of the data transmission;
  • RA Set to a pre-agreed parameter or value, or BSSID.
  • FCS Set in the same way as the traditional CTS.
  • TBD Set to a time length less than or equal to SIFS to separate the newly added OFDM symbols from the traditional CTS.
  • the newly added OFDM symbol can be divided into N RUs, where N is greater than or equal to 8, for example, N can be equal to 9. Then allocate 8 of the RUs in order to correspond to 8 PAIDs in the MU-RTS, The HEW-STA sends a PAID or STA ID on the corresponding RU when replying to the MU-CTS, so that the HEW-AP knows which STA is replying to the MU-CTS.
  • Step 4 The traditional STA receives any one of the MU-RTS and the MU-CTS/eCTS, and updates the NAV according to the Duration value thereof;
  • the basis for the STA to update the NAV is:
  • the STA first determines whether the protocol version, the type value, and the subtype value in the frame control are values known by the STA. If it is an unknown value, then read the duration field and update the NAV.
  • the STA finds that the values of the above three fields are known, then the RA is read and it is determined whether it is a frame sent to itself. If it is not sent to itself, then read the duration field and update the NAV.
  • Step 5 The HEW-AP receives the MU-CTS, sends a data trigger frame, and adjusts resource allocation information in the trigger frame.
  • the HEW-AP receives the eCTS and sends a data trigger frame.
  • Step 6 After receiving the data trigger frame, the HEW-STA determines whether to send data according to the resource allocation indication information in the data trigger frame.
  • Another data transmission control method disclosed in the embodiment of the present application describes a process in which the AP competes successfully and sends data to the STA, including the following steps:
  • Step 1 The HEW-AP listening channel
  • the HEW-AP listens to the channel and attempts to transmit the MU-RTS when the channel is idle.
  • Each MU-RTS occupies a bandwidth of 20 MHz.
  • Step 2 The HEW-AP successfully sends the MU-RTS.
  • MU-RTS differs from traditional RTS in format and content. Its frame format in the physical layer is shown in Figure 6, and the frame format in MAC. As shown in Figure 10, the assignment and meaning of each part is as follows:
  • Frame Control Different from the traditional RTS in subtype value, for example, 0101 (this value can be defined as other unused values); or different from the traditional RTS in the protocol version, for example, 01 (only used in existing standards) 00, so it can be written as a value other than 00; and bit 8 to bit 15 are redefined as BSS color to indicate the information of the BSS.
  • Duration Sets the duration of the subsequent data transmission + 2 times the duration of the SIFS+CTS duration; the legacy STA and the HEW-STA not scheduled in the MU-RTS will update the NAV according to this value, and the HEW scheduled in the MU-RTS -STA uses this value to determine the size of the data transmission;
  • TA Redefined as 4 partial association identifiers (PAIDs) for receiving uplink transmitting STAs, where the PAID is 12 bits, and are sequentially arranged (numbered sequentially, 1, 2, 3, 4), and 4 PAIDs are 48 bits in total.
  • PAIDs partial association identifiers
  • RA Redefined as 4 partial association identifiers (PAIDs) for receiving uplink transmitting STAs, where the PAID is 12 bits, and are sequentially arranged (numbered sequentially, 5, 6, 7, 8), and 4 PAIDs are 48 bits in total.
  • PAIDs partial association identifiers
  • FCS Set in the same way as traditional RTS.
  • Step 3 After receiving the MU-RTS, the HEW-STA sends the MU-CTS/eCTS according to the PAID indication, or updates the NAV.
  • the HEW-STA receives the MU-RTS transmitted by the HEW-AP, determines whether it is the current BSS according to the BSS color indicated in the HEW-RTS, and determines whether it is necessary to reply to the MU-CTS/eCTS according to the PAID indicated therein. If it is determined that the MU-CTS/eCTS is not replied, the NAV is updated according to the duration in the MU-RTS. If it is determined that the MU-CTS is to be replied, it is replied according to the following format, and let the HEW-AP know which HEW-STA replies to the MU-CTS.
  • All HEW-STAs reply to the CTS of the same format, that is, either reply to the MU-CTS, or both reply to the eCTS.
  • the MU-CTS consists of a newly added OFDM symbol and a conventional CTS, and the newly added OFDM symbol and the conventional CTS are both separate PHY layer frames as shown in FIG.
  • the frame format of the physical layer is shown in Figure 13.
  • the frame format of the MAC is shown in Figure 7. The assignment and meaning of each part are as follows:
  • Frame Control Different from the traditional CTS in the subtype value, it is 0100 (this value can be defined as other unused values); or it is different from the traditional RTS in the protocol version, for example, 01 (only 00 is used in the existing standard) Therefore, it can be written as a value other than 00; and bit 8 to bit 15 are redefined as BSS color to indicate the information of the BSS.
  • Duration Set to duration in RTS minus SIFS minus CTS duration; traditional STAs and HEW-STAs not scheduled in MU-RTS will update NAV according to this value, and HEW-STA scheduled in MU-RTS Then use this value to determine the size of the data transmission;
  • RA Set to a pre-agreed parameter or value, or BSSID.
  • FCS Set in the same way as the traditional CTS.
  • TBD Set to a time length less than or equal to SIFS to separate the newly added OFDM symbols from the traditional CTS.
  • the newly added OFDM symbol can be divided into N RUs, where N is greater than or equal to 8, for example, N can be equal to 9. Then, the eight RUs are allocated in order to correspond to the eight PAIDs in the MU-RTS, and the HEW-STA sends the PAID or the STA ID in the corresponding RU when replying to the MU-CTS, so that The HEW-AP knows which STA is replying to the MU-CTS.
  • Step 4 The traditional STA receives any one of the MU-RTS and the MU-CTS, and updates the NAV according to the Duration value thereof;
  • Step 5 The HEW-AP receives the MU-CTS and determines which STAs to send data to;
  • the HEW-AP receives the eCTS and is ready to send data frames.
  • a data transmission control method disclosed in the embodiment of the present application describes a process in which an AP competes for multiple 20 MHz channels and instructs a STA to perform data transmission.
  • the HEW-AP and the HEW-STA are performed on each 20 MHz channel. The method described in the first embodiment.
  • a data transmission control method disclosed in the embodiment of the present application describes a process in which an AP competes for multiple 20 MHz channels and instructs a STA to perform data transmission.
  • the HEW-AP and the HEW-STA are performed on each 20 MHz channel. The method described in the second embodiment.
  • a data transmission control method disclosed in the embodiment of the present application describes a process in which STA competition is successful and the OFDMA scheduling control right is handed over to the AP, and the AP scheduling STA sends data, including the following steps:
  • Step 1 The HEW-STA listens to the channel and sends a first type of first control frame (also referred to as eRTS);
  • the HEW-STA listens to the channel and attempts to send eRTS when the channel is idle (it may also use traditional RTS here, but the traditional RTS needs to use the MAC address of the AP in the RA to distinguish which BSS).
  • eRTS uses the format defined in Figures 5 and 6, each RTS occupies a 20MHz band width.
  • Frame Control Different from the traditional RTS in subtype value, for example, 0101 (this value can be defined as other unused values); or different from the traditional RTS in the protocol version, for example, 01 (only used in existing standards) 00, so it can be written as a value other than 00; and bit 8 to bit 15 are redefined as BSS color to indicate the information of the BSS.
  • the BSS color can fully utilize bits 8 through 15. If the subtype or protocol version is the same as the conventional RTS, then 1 bit is needed to indicate that this is an eRTS, such as bit 13, and the remaining 7 bits are used to indicate the BSS color.
  • Duration Set to the estimated duration of subsequent data transmission + 2 times SIFS + MU-RTS duration; traditional STAs and other HEW-STAs will update the NAV according to this value, and the corresponding HEW-AP judges the data transmission by this value. the size of;
  • TA MAC address of the HEW-STA.
  • RA MAC address of the HEW-AP.
  • FCS Set in the same way as traditional RTS.
  • Step 2 The HEW-AP successfully sends a second type of first control frame (also referred to as MU-RTS);
  • the HEW-AP competes for the channel and successfully transmits the MU-RTS.
  • MU-RTS differs from traditional RTS in format and content.
  • the frame format of the physical layer is shown in Figure 6.
  • the frame format of the MAC layer is shown in Figure 10. The assignment and meaning of each part are as follows:
  • Frame Control Different from the traditional RTS in subtype value, for example, 0101 (this value Can be defined as other unused values); or different from the traditional RTS on the protocol version, for example 01 (only 00 is used in the existing standard, so it can be written as a value other than 00); and bit 8 is Bit 15 is redefined as BSS color to indicate the information of the BSS.
  • Duration Sets the duration of subsequent data transmission + 3 times SIFS + CTS duration + duration of data trigger frame; traditional STAs and HEW-STAs not scheduled in MU-RTS will update NAV according to this value, and MU-RTS The HEW-STA scheduled in the medium determines the size of the data transmission by this value;
  • TA Redefined as 4 partial association identifiers (PAIDs) for receiving uplink transmitting STAs, where the PAID is 12 bits, and are sequentially arranged (numbered sequentially, 1, 2, 3, 4), and 4 PAIDs are 48 bits in total.
  • PAIDs partial association identifiers
  • RA Redefined as 4 partial association identifiers (PAIDs) for receiving uplink transmitting STAs, where the PAID is 12 bits, and are sequentially arranged (numbered sequentially, 5, 6, 7, 8), and 4 PAIDs are 48 bits in total.
  • PAIDs partial association identifiers
  • FCS Set in the same way as traditional RTS.
  • Step 3 After receiving the MU-RTS, the HEW-STA sends a second control frame according to the PAID indication, or updates the NAV.
  • the HEW-STA receives the MU-RTS sent by the HEW-AP, determines whether it is the current BSS according to the BSS color indicated in the HEW-RTS, and determines whether it is necessary to reply to the second control frame according to the PAID indicated therein. If it is determined that the second control frame is not to be replied, the NAV is updated according to the duration in the MU-RTS.
  • the frame format of the second control frame in the MAC layer is as shown in FIG. 7, and the frame structure in the physical layer may be as shown in FIG. 13 (the second control frame shown in FIG. 13 may also be Called MU-CTS), let the HEW-AP know which HEW-STA replies to the MU-CTS; or,
  • the frame structure of the second control frame in the physical layer may also be as shown in FIG. 8 (the second control frame shown in FIG. 8 may also be referred to as eCTS), and the HEW-AP is not required to distinguish which HEW-STA replies. eCTS.
  • All HEW-STAs reply to the CTS of the same format, that is, either reply to the MU-CTS, or both reply to the eCTS.
  • the MU-CTS consists of a newly added OFDM symbol and a conventional CTS, and the newly added OFDM symbol and the conventional CTS are both separate PHY layer frames as shown in FIG.
  • the frame format of the physical layer is shown in Figure 13.
  • the frame format of the MAC is shown in Figure 7. The assignment and meaning of each part are as follows:
  • Frame Control Different from the traditional CTS in the subtype value, it is 0100 (this value can be defined as other unused values); or it is different from the traditional RTS in the protocol version, for example, 01 (only 00 is used in the existing standard) Therefore, it can be written as a value other than 00; and bit 8 to bit 15 are redefined as BSS color to indicate the information of the BSS.
  • Duration Set to duration in RTS minus SIFS minus CTS duration; traditional STAs and HEW-STAs not scheduled in MU-RTS will update NAV according to this value, and HEW-STA scheduled in MU-RTS Then use this value to determine the size of the data transmission;
  • RA Set to a pre-agreed parameter or value, or BSSID.
  • FCS Set in the same way as the traditional CTS.
  • TBD Set to a time length less than or equal to SIFS to separate the newly added OFDM symbols from the traditional CTS.
  • the newly added OFDM symbol can be divided into N RUs, where N is greater than or equal to 8, for example, N can be equal to 9. Then allocate 8 of the RUs in order to correspond to 8 PAIDs in the MU-RTS, The HEW-STA sends a PAID or STA ID on the corresponding RU when replying to the MU-CTS, so that the HEW-AP knows which STA is replying to the MU-CTS.
  • Step 4 The traditional STA receives any one of the MU-RTS and the MU-CTS, and updates the NAV according to the Duration value thereof;
  • Step 5 The HEW-AP receives the MU-CTS, sends a data trigger frame, and adjusts resource allocation information in the trigger frame.
  • Step 6 After receiving the data trigger frame, the HEW-STA determines whether to send data according to the resource allocation indication information in the data trigger frame.
  • a data transmission control method disclosed in the embodiment of the present application describes a process in which the STA competes successfully and the OFDMA scheduling control is given to the AP, and the AP sends data to the STA, which specifically includes the following steps:
  • Step 1 The HEW-STA listens to the channel and sends an eRTS.
  • the HEW-STA listens to the channel and attempts to send eRTS when the channel is idle (it may also use traditional RTS here, but the traditional RTS needs to use the MAC address of the AP in the RA to distinguish which BSS).
  • the eRTS uses the manner defined in Figures 5 and 6, each RTS occupies a bandwidth of 20 MHz.
  • Frame Control Different from the traditional RTS in subtype value, for example, 0101 (this value can be defined as other unused values); or different from the traditional RTS in the protocol version, for example, 01 (only used in existing standards) 00, so it can be written as a value other than 00); And bit 8 to bit 15 are redefined as BSS color to indicate the information of the BSS.
  • the BSS color can fully utilize bits 8 through 15. If the subtype or protocol version is the same as the conventional RTS, then 1 bit is needed to indicate that this is an eRTS, such as bit 13, and the remaining 7 bits are used to indicate the BSS color.
  • Duration Set to the estimated duration of subsequent data transmission + 2 times SIFS + MU-RTS duration; traditional STAs and other HEW-STAs will update the NAV according to this value, and the corresponding HEW-AP judges the data transmission by this value. the size of;
  • TA MAC address of the HEW-STA.
  • RA MAC address of the HEW-AP.
  • FCS Set in the same way as traditional RTS.
  • Step 2 The HEW-AP sends the MU-RTS.
  • the HEW-AP receives the eRTS and then sends the MU-RTS.
  • MU-RTS differs from traditional RTS in format and content.
  • the frame format of the physical layer is shown in Figure 6.
  • the frame format of the MAC is shown in Figure 10. The assignment and meaning of each part are as follows:
  • Frame Control Different from the traditional RTS in subtype value, for example, 0101 (this value can be defined as other unused values); or different from the traditional RTS in the protocol version, for example, 01 (only used in existing standards) 00, so it can be written as a value other than 00; and bit 8 to bit 15 are redefined as BSS color to indicate the information of the BSS.
  • Duration Sets the duration of the subsequent data transmission + 2 times the duration of the SIFS+CTS duration; the legacy STA and the HEW-STA not scheduled in the MU-RTS will update the NAV according to this value, and the HEW scheduled in the MU-RTS -STA uses this value to determine the size of the data transmission;
  • TA Redefined as 4 partial association identifiers (PAIDs) for receiving uplink transmitting STAs, where the PAID is 12 bits, and are sequentially arranged (numbered sequentially, 1, 2, 3, 4), and 4 PAIDs are 48 bits in total.
  • PAIDs partial association identifiers
  • RA Redefined as 4 partial association identifiers (PAIDs) for receiving uplink transmitting STAs, where the PAID is 12 bits, and are sequentially arranged (numbered sequentially, 5, 6, 7, 8), and 4 PAIDs are 48 bits in total.
  • PAIDs partial association identifiers
  • FCS Set in the same way as traditional RTS.
  • Step 3 After receiving the MU-RTS, the HEW-STA sends the MU-CTS/eCTS according to the PAID indication, or updates the NAV.
  • the HEW-STA receives the MU-RTS transmitted by the HEW-AP, determines whether it is the current BSS according to the BSS color indicated in the HEW-RTS, and determines whether it is necessary to reply to the MU-CTS/eCTS according to the PAID indicated therein. If it is determined that the MU-CTS/eCTS is not replied, the NAV is updated according to the duration in the MU-RTS. If it is determined that the MU-CTS is to be replied, it is replied according to the format shown in Figs. 13 and 7, letting the HEW-AP know which HEW-STA replies to the MU-CTS.
  • All HEW-STAs reply to the CTS of the same format, that is, either reply to the MU-CTS, or both reply to the eCTS.
  • the MU-CTS consists of a newly added OFDM symbol and a conventional CTS, and the newly added OFDM symbol and the conventional CTS are both separate PHY layer frames as shown in FIG.
  • the frame format of the physical layer is shown in Figure 13.
  • the frame format of the MAC is shown in Figure 7. The assignment and meaning of each part are as follows:
  • Frame Control Different from the traditional CTS in the subtype value, it is 0100 (this value can be defined as other unused values); or it is different from the traditional RTS in the protocol version, for example, 01 (only 00 is used in the existing standard) Therefore, it can be written as a value other than 00; and bit 8 to bit 15 are redefined as BSS color to indicate the information of the BSS.
  • Duration Set to duration in RTS minus SIFS minus CTS duration; traditional STAs and HEW-STAs not scheduled in MU-RTS will update NAV according to this value, and HEW-STA scheduled in MU-RTS Then use this value to determine the size of the data transmission;
  • RA Set to a pre-agreed parameter or value, or BSSID.
  • FCS Set in the same way as the traditional CTS.
  • TBD Set to a time length less than or equal to SIFS to separate the newly added OFDM symbols from the traditional CTS.
  • the newly added OFDM symbol can be divided into N RUs, where N is greater than or equal to 8, for example, N can be equal to 9. Then, the eight RUs are allocated in order to correspond to the eight PAIDs in the MU-RTS, and the HEW-STA sends the PAID or the STA ID in the corresponding RU when replying to the MU-CTS, so that the HEW-AP knows which STA replies to the MU- CTS.
  • Step 4 The traditional STA receives any one of the MU-RTS and the MU-CTS, and updates the NAV according to the Duration value thereof;
  • Step 5 The HEW-AP receives the HEW-CTS and determines which STAs to send data to.
  • This embodiment describes a process in which a STA competes for a plurality of 20 MHz channels successfully and is scheduled by the AP to instruct the STA to perform data transmission.
  • HEW-AP and HEW-STA perform embodiments on each 20 MHz channel Five methods.
  • This embodiment describes a process in which a STA competes for multiple 20 MHz channels successfully and the AP transmits data to the STA.
  • the HEW-AP and HEW-STA perform the method of Embodiment 6 on each 20 MHz channel.
  • a data transmission control method disclosed in the embodiment of the present application describes a process in which an AP competes successfully and instructs a STA to perform data transmission, including the following steps:
  • Step 1 The HEW-AP listening channel
  • the HEW-AP listens to the channel and attempts to send eRTS when the channel is idle. Each eRTS occupies a bandwidth of 20 MHz.
  • Step 2 The HEW-AP successfully sends the eRTS.
  • the HEW-AP competes for the channel and successfully sends the eRTS.
  • eRTS differs from traditional RTS in format and content.
  • the frame format of the physical layer is shown in Figure 6.
  • the frame format of the MAC is shown in Figure 5. The assignment and meaning of each part are as follows:
  • Frame Control Different from the traditional RTS in subtype value, for example, 0101 (this value can be defined as other unused values); or different from the traditional RTS in the protocol version, for example, 01 (only used in existing standards) 00, so it can be written as a value other than 00; and bit 8 to bit 15 are redefined as BSS color to indicate the information of the BSS.
  • the BSS color can fully utilize bits 8 through 15. If the subtype or protocol version is the same as the conventional RTS, then 1 bit is needed to indicate that this is an eRTS, such as bit 13, and the remaining 7 bits are used to indicate the BSS color.
  • Duration Set to the estimated duration of subsequent data transmission + 3 times SIFS + MU-RTS duration + trigger frame duration; traditional STAs and other HEW-STAs will update the NAV according to this value, and the corresponding HEW-AP passes this The value determines the size of the data transmission;
  • TA MAC address of the HEW-AP.
  • RA Set to a pre-agreed parameter or value, or BSSID.
  • FCS Set in the same way as traditional RTS.
  • Step 3 The HEW-STA replies to the eCTS after receiving the eRTS, or updates the NAV;
  • the HEW-STA receives the eRTS transmitted by the HEW-AP, and determines whether it is the BSS according to the BSS color indicated in the eRTS to determine whether it is necessary to reply to the eCTS. If it is determined that the eCTS is not replied, the NAV is updated according to the duration in the eRTS.
  • All HEW-STAs reply to the CTS in the same format, that is, they all reply to eCTS.
  • the frame format of the eCTS in the physical layer is shown in Figure 8.
  • the frame format of the MAC is shown in Figure 7. The assignment and meaning of each part are as follows:
  • Frame Control Different from the traditional CTS in the subtype value, it is 0100 (this value can be defined as other unused values); or it is different from the traditional RTS in the protocol version, for example, 01 (only 00 is used in the existing standard) , so it can be written as a value other than 00); And bit 8 to bit 15 are redefined as BSS color to indicate the information of the BSS.
  • the BSS color can fully utilize bits 8 through 15. If the subtype or protocol version is the same as the conventional RTS, then 1 bit is needed to indicate that this is an eCTS, such as bit 13, and the remaining 7 bits are used to indicate the BSS color.
  • Duration set to duration in RTS minus SIFS minus CTS duration; traditional STAs and other HEW-STAs will update NAV according to this value;
  • RA Set to a pre-agreed parameter or value, or BSSID.
  • FCS Set in the same way as the traditional CTS.
  • Step 4 The traditional STA receives any one of the eRTS or the eCTS, and updates the NAV according to the Duration value thereof;
  • Step 5 The HEW-AP receives the eCTS and sends a data trigger frame.
  • Step 6 After receiving the data trigger frame, the HEW-STA determines whether to send data according to the resource allocation indication information in the data trigger frame.
  • a data transmission control method disclosed in the embodiment of the present application describes a process in which an AP competes successfully and sends data to a STA, including the following steps:
  • Step 1 The HEW-AP listening channel
  • the HEW-AP listens to the channel and attempts to send eRTS when the channel is idle. Each eRTS occupies a bandwidth of 20 MHz.
  • Step 2 The HEW-AP successfully sends the eRTS.
  • Step 3 After receiving the eRTS, the HEW-STA sends the eCTS according to the PAID indication, or updates the NAV.
  • the HEW-STA receives the eRTS transmitted by the HEW-AP, and determines whether it is the BSS according to the BSS color indicated in the eRTS to determine whether it is necessary to reply to the eCTS. If it is determined that the eCTS is not replied, the NAV is updated according to the duration in the eRTS.
  • All HEW-STAs reply to the CTS in the same format, that is, they all reply to eCTS.
  • Step 4 The traditional STA receives any one of the eRTS or the eCTS, and updates the NAV according to the Duration value thereof;
  • Step 5 The HEW-AP receives the eCTS and prepares to send a data frame.
  • the frame formats of the eRTS and the eCTS can be referred to other embodiments, and details are not described herein again.
  • the last 8 bits of the frame control part are not modified here, and the BSS color information is placed in the RA word. Between the segment and the FCS field.
  • the legacy STA receives any one of the MU-RTS and the MU-CTS/eCTS, and updates the NAV according to the Duration value therein.
  • the NAV update rule of the HEW-STA that does not include the corresponding identity in the MU-RTS may select any one of the following rules:
  • BSS color It is judged by BSS color whether it is the frame of the BSS, if it is the BSS, the NAV is updated, and if it is not the BSS, the NAV is not updated;
  • the BSS color It is judged by the BSS color whether it is the frame of the BSS, if the BSS is not the present BSS and the preset condition is met, the NAV is not updated, and if it is the BSS or not the BSS and the preset condition is not met, the NAV is updated.
  • the preset condition may be a CCA threshold smaller than the CCA threshold or the OBSS.
  • the legacy STA receives any one of the eRTS and the eCTS, and updates the NAV according to the Duration value therein.
  • the NAV update rule of the HEW-STA can select any of the following rules:
  • BSS color It is judged by BSS color whether it is the frame of the BSS, if it is the BSS, the NAV is updated, and if it is not the BSS, the NAV is not updated;
  • the BSS color determines whether it is the frame of the BSS, if it is the BSS or not the BSS If the preset condition is met, the NAV is not updated, and if it is not the BSS and the preset condition is not met, the NAV is updated.
  • the preset condition may be a CCA threshold smaller than the CCA threshold or the OBSS.
  • a data transmission control method disclosed in the embodiment of the present application, as shown in FIG. 3, includes the following steps:
  • the access point sends the first control frame after confirming that the channel is idle.
  • the frame format of the first control frame based on the medium access control MAC layer protocol includes a first duration field and carries an identifier of the basic service set.
  • the identifier of the basic service set may be a Basic Service Set color.
  • BSS color BSS color is used to inform the stations in this BSS to participate in data transmission.
  • the value of the first Duration field is used to indicate the duration of protection required for data transmission between the access point and the site within the BSS. Generally, the protection duration is not less than the data transmission between the access point and the site within the BSS. time.
  • the station After receiving the first control frame, the station determines whether it is in the BSS, if yes, executes S303, if not, executes S304;
  • S303 The station returns a second control frame to the access point.
  • the second control frame carries the BSS color in the frame structure of the MAC layer protocol, and the purpose is to indicate to the access point that the site is a site that the access point is allowed to participate in data transmission.
  • the interference caused by the data transmission in the basic service set may be: the CCA of the site whose received power is greater than the clear channel assessment (CCA) threshold or the overlapping basic service set (OBSS). Threshold. That is to say, although the station is not in the BSS where the data transmission is to be performed, because the station satisfies the above conditions, the station may interfere with the data transmission. In order to avoid interference, even if the station is not in the above BSS, it is still updated. Site NAV.
  • CCA clear channel assessment
  • OBSS overlapping basic service set
  • the first Duration field is carried in the first control frame, and the STA that does not participate in the data transmission updates the NAV, so as to keep silent during data transmission by other STAs, thereby avoiding The data frame in the transmission causes interference.
  • the access point uses the frame structure as a carrier to inform a STA in a BSS to participate in communication, and usually one BSS includes multiple STAs, so in the same period, the access point can perform data with multiple STAs. Transmission, thereby achieving the purpose of improving bandwidth utilization.
  • Another data transmission control method disclosed in the embodiment of the present application, as shown in FIG. 4, includes the following steps:
  • S401 an HEW-AP listening channel
  • the frame format of the first type first control frame based on the MAC layer protocol is as shown in FIG. 5, and includes:
  • Frame Control Frame Control field (occupying 16 bits), specifically including protocol version protocol version field (occupying 2 bits), used to set the version of the protocol; type Type field (occupying 2 bits), used to set the approximate type of the frame; Subtype value A field (occupying 4 bits) for setting the specific type of the frame; a BSS color field (occupying 8 bits) for setting the identity of the BSS.
  • protocol version protocol version field occupying 2 bits
  • type Type field occupying 2 bits
  • Subtype value A field occupying 4 bits
  • a BSS color field (occupying 8 bits) for setting the identity of the BSS.
  • the value of the Subtype value field to an unused value, such as 0101 (the traditional RTS frame is 1011), or set the value of the protocol version field to an unused value. , for example 01 (traditional RTS frame is 00). If the subtype or protocol version is different from the conventional RTS frame, then the BSS color can fully utilize bits 8 through 15.
  • the subtype or protocol version is the same as the conventional RTS frame, then 1 bit is required to indicate that this is the first type of first control frame, which can be from the BSS color of one of the 8 bits, such as bit 15, and the conventional RTS frame. Make a distinction with the remaining 7 bits To indicate the BSS color.
  • bit 15 it is necessary to add a case to the existing standard pair bit 15 to indicate that the first type of first control frame contains the BSS color.
  • the current transmitting device is a device having the function (ie, 11ax) described herein, rather than a conventional device.
  • the first Duration field (occupying 16 bits) is named as the first Duration field in order to distinguish it from the Duration field in the second control frame.
  • the value of the first Duration field is: the estimated duration of subsequent data transmission + 2 times the short inter-frame interval SIFS duration + the duration of the first type of first control frame.
  • the Legacy-STA and the HEW-STA that is not involved in data transmission will update the NAV according to this value, and the HEW-STA participating in the data transmission will determine the size of the transmitted data according to this value.
  • the receiving end address RA field (occupying 48 bits) is set to a preset value or parameter, for example, it can be a BSSID.
  • the sender address TA field (occupying 48 bits) is set to the MAC address of the HEW-AP.
  • FCS Frame Check Sequence
  • CRC Cyclic Redundancy Check
  • the frame format of the first type first control frame based on the physical layer protocol is the same as the traditional RTS frame, as shown in FIG. 6, including the traditional Legacy Short Training Field (L-STF) field, and the traditional long training field. (Legacy Long Training Field, L-LTF) field, a legacy Signaling Field (L-SIG) field, and a data data field.
  • L-STF Legacy Short Training Field
  • L-LTF Long Training Field
  • L-SIG legacy Signaling Field
  • the HEW-STA After identifying the first type of the first control frame according to the Frame Control field, the HEW-STA confirms whether it is in the BSS indicated by the BSS color, if yes, executes S404, and if not, executes S405;
  • the HEW-STA returns a second control frame to the HEW-AP.
  • the frame structure of the second control frame based on the MAC layer protocol is as shown in FIG. 7, and includes:
  • Frame Control Frame Control field (occupying 16 bits), specifically including protocol version protocol version field (occupying 2 bits), used to set the version of the protocol; type Type field (occupying 2 bits), used to set the approximate type of the frame; Subtype value Field (occupying 4 bits), Used to set the specific type of frame; BSS color field (occupying 8 bits), used to set the identity of the BSS.
  • the value of the Subtype value field can be set to an unused value, such as 0101 (the traditional RTS frame is 1100), or the value of the protocol version field is set to an unused value. , for example 01 (traditional RTS frame is 00). If the subtype or protocol version is different from the conventional RTS frame, then the BSS color can fully utilize bits 8 through 15.
  • the subtype or protocol version is the same as a conventional RTS frame, then 1 bit is needed to indicate that this is the second control frame, such as bit 15, and the remaining 7 bits are used to indicate the BSS color.
  • the current transmitting device is a device having the function (ie, 11ax) described herein, rather than a conventional device.
  • the second Duration field (occupies 16 bits).
  • the value of the first Duration field is: the estimated duration of subsequent data transmission + 2 times the short interframe space SIFS duration + the duration of the data trigger frame.
  • the Legacy-STA and the HEW-STA may update the NAV according to the value of the second Duration field, and the HEW-AP determines the size of the data transmission by this value.
  • the receiving end address RA field (occupying 48 bits) is set to a preset value or parameter, for example, it can be a BSSID.
  • the FCS field (occupying 32 bits) is used for performing CRC check on the MAC address of the access point.
  • the frame structure of the second control frame shown in FIG. 7 based on the physical layer protocol is as shown in FIG. 8, and includes: an L-STF field, an L-LTF field, an L-SIG field, and a data data field.
  • the HEW-STA is based on the value of the first Duration field in the first type of first control frame or the second field in the second control frame. Value (the same in both embodiments) to update the NAV;
  • Legacy-STA is unable to identify the first type of first control frame, and updates the NAV according to the value of the first Duration field or the value of the second field (the two are the same in this embodiment). .
  • the HEW-AP and the HEW-STA in the BSS may start data transmission.
  • the uplink transmission may be performed after the HEW-AP receives the second control frame.
  • Sending data to the HEW-STA the downlink transmission process may be: after receiving the second control frame, the HEW-AP sends a data trigger frame to the HEW-STA, and after receiving the data trigger frame, the HEW-STA according to the resource allocation indication information therein Determine if you want to send data.
  • the improvement of the existing RTS frame and the CTS frame structure enables the HEW-AP to control multiple HEW-STAs to perform data transmission, thereby improving resource utilization, and
  • the Duration field is reserved in both the first type of the first control frame frame and the second control frame, so that stations that do not participate in the data transmission and interfere with the data transmission can update the NAV, thereby remaining silent during the data frame transmission, avoiding Interference from data frames.
  • Another data transmission control method disclosed in the embodiment of the present application, as shown in FIG. 9, includes the following steps:
  • S901 an HEW-AP listening channel
  • the frame structure of the second type first control frame based on the MAC layer protocol is as shown in FIG. 10, and includes:
  • the frame control frame control field (occupying 16 bits), the structure and function of this field are the same as those shown in FIG. 5, and details are not described herein again.
  • the first Duration field (occupying 16 bits). Different from FIG. 5, in this embodiment, the value of the first Duration field is: the estimated duration of subsequent data transmission + 3 times the short interframe space SIFS duration + the duration of the data trigger frame.
  • Legacy-STA and not participating in data transmission (not adjusted The HEW-STA of the degree can update the NAV according to this value, and the HEW-STA participating in the data transmission will determine the size of the transmitted data according to this value.
  • the receiving end address RA field (occupying 48 bits) is different from that of FIG. 5 in that, in this embodiment, the identifier of the station of the first preset integer in the BSS is indicated.
  • the sender address TA field (occupying 48 bits) is different from that of FIG. 5.
  • the identifier of the site of the first preset integer in the BSS is displayed, as shown in FIG. 10, in the RA and the TA.
  • the Partial Association Identification (PAID) of the four STAs is limited to the number of bytes occupied by the TA and the RA. Therefore, the first integer and the second integer are both 4 (the number of the eight identifiers may be 1 in sequence. -8).
  • the FCS field (occupying 32 bits) has the same function as the frame structure shown in FIG.
  • the frame format of the second type first control frame based on the physical layer protocol is as shown in FIG. 6.
  • S903 After identifying the second type first control frame according to the Frame Control field, the HEW-STA confirms whether it is in the BSS indicated by the BSS color and whether the PAID is included in the second type first control frame, and if yes, executes S904. If not, execute S905 or S906;
  • the HEW-STA returns a second control frame to the HEW-AP.
  • the frame structure of the second control frame can be seen in FIG. 7 and FIG. 8 , and details are not described herein again.
  • the HEW-STA is based on the value of the first Duration field in the second type first control frame, and/or the second field in the second control frame. Value (the two are different in this embodiment) to update the NAV;
  • the HEW-STA is based on the value of the first Duration field in the second type first control frame, and/or the second control frame.
  • the value of the second field (which is different in this embodiment) to update the NAV;
  • the NAV may be updated according to the Duration field value in the frame received first, and then the NAV is updated according to the Duration field value in the received frame.
  • the HEW-AP may perform data transmission with the HEW-STA that has replied to the second control frame.
  • the specific process of data transmission refer to the above. Embodiments are not described here.
  • the HEW-AP specifies a specific HEW-STA in addition to the BSS, so that it is more targeted.
  • the STA can switch between the HEW mode and the legacy mode, if the STA specified by the HEW-AP is currently in the legacy mode, it cannot identify the second type of the first control frame, and thus does not reply to the second.
  • the control frame the HEW-AP can communicate with the HEW-STA that replies to the second control frame, while the Legacy-STA remains silent during this communication.
  • Another data transmission control method disclosed in the embodiment of the present application, as shown in FIG. 11, includes the following steps:
  • S1101 an HEW-AP listening channel
  • the HEW-AP competes for a plurality of 20 MHz spare channels, and transmits the same second type of first control frame on each of the idle channels.
  • FIG. 10 the frame structure of the first type control frame of the second type is shown in FIG. 10 and FIG. 6, and details are not described herein again.
  • S1103 After identifying the second type of first control frame according to the Frame Control field, the HEW-STA confirms whether it is in the BSS indicated by the BSS color and whether the PAID is included in the second type first control frame, and if yes, executes S1104. If not, execute S1105 or S1106;
  • the HEW-STA replies to the second control frame to the HEW-AP. Similarly, the HEW-STA may also send the second control frame by using multiple idle channels.
  • the frame structure of the second control frame based on the MAC layer protocol is as shown in FIG. 7, which is I won't go into details here.
  • the frame structure of the second control frame shown in FIG. 7 based on the physical layer is as shown in FIG. 13, and includes:
  • the structure shown in FIG. 13 and the OFDMA symbol include a To Be Defined (TBD) between the two, and the TBD is less than or equal to the SIFS duration.
  • TBD To Be Defined
  • the OFDMA symbol includes N resource unit RUs, and the RU corresponding to the current site carries the identifier of the site, and each RU corresponds to a different site, where N is a third preset integer, and the second type is described in FIG.
  • the order of the site identification may be in the same order as the manner of identifying the site in the second type of first control frame structure described in FIG.
  • the HEW-STA is based on the value of the first Duration field in the first type control frame of the second type, and/or the second field in the second control frame. Value (the two are different in this embodiment) to update the NAV;
  • the HEW-STA is in accordance with the value of the first Duration field in the second type first control frame, and/or in the second control frame.
  • the value of the second field (the two are different in this embodiment) to update the NAV;
  • the Legacy-STA is unable to identify the first control frame, and updates the NAV according to the value of the first Duration field and/or the value of the second field (both in this embodiment).
  • the HEW-STA informs the identity in the replied second control frame, thereby enabling the HEW-AP to know which HEW-STA replies the second control frame.
  • Another data transmission control method disclosed in the embodiment of the present application, as shown in FIG. 14, includes the following steps:
  • the HEW-STA sends the first control frame to the HEW-AP through the channel(s);
  • the purpose of sending the first control frame by the HEW-STA1 is to notify the HEW-AP.
  • the BSS color carrying the HEW-STA1 in the first control frame may be any one of the first type of the first control frame and the second type of the first control frame.
  • the HEW-AP sends a second type of first control frame.
  • the second type of first control frame is as shown in FIG. 10, wherein the BSS color is the BSS color carried in the first control frame received in the previous step. It should be noted that the second type first control frame may carry the PAID of the HEW-STA1 or may not carry the PAID. If the PAID is not carried, the data transmission control process may be performed by using other data frames and the HEW-STA1.
  • S1405 The HEW-STA and the Legacy-STA that are not designated to participate in data transmission update the NAV.
  • the HEW-STA and the HEW-AP may also transmit data frames by using multiple idle channels.
  • the HEW-STA contends for the channel and hands over the scheduling control of the data transmission to the HEW-AP, which can also improve the bandwidth utilization under the premise of avoiding interference.
  • an access point as shown in FIG. 16, including:
  • the first sending module 1601 is configured to send a first control frame, where the first control frame includes a first Duration field and carries an identifier of a basic service set, where the value of the first Duration field is used to indicate the access point and The length of protection required for data transmission between stations within the basic service set;
  • the data transmission module 1602 is configured to perform data transmission with the site if the identifier of the basic service set carried by the second control frame fed back by the site is the same as the identifier of the basic service set carried by the first control frame.
  • the specific implementation manner that the first sending module sends the first control frame may be: After the channel is idle, or if it is confirmed that there are at least two idle channels, the first control frame is sent to the at least two idle channels; or if the length of the buffer buffer of the access point or the The first control frame is sent when the length of the buffer reported by the station is greater than a preset threshold.
  • the specific implementation manner of the first sending module confirming that the channel is idle may be: listening to the idle channel; or receiving the first control frame sent by the station, where the first control frame carries the identifier of the basic service set where the station is located .
  • the access point described in this embodiment can enable multiple sites to access simultaneously in the same time period based on the first control frame that is sent, thereby improving bandwidth utilization.
  • the embodiment of the present application further discloses a site, as shown in FIG. 17, comprising:
  • the first receiving module 1701 is configured to receive a first control frame sent by the access point, where the first control frame includes a first Duration field and carries an identifier of the basic service set;
  • a first processing module 1702 configured to: when the site is in the basic service set, reply a second control frame to the access point, where the second control frame carries an identifier of the basic service set; If the site is not in the basic service set and interferes with data transmission in the basic service set, the NAV is updated according to at least the value of the first Duration field.
  • the method may further include:
  • the second sending module 1703 is configured to: before receiving the first control frame sent by the access point, hear the idle channel; send the first control frame to the access point, where the first control frame carries An identifier of a basic service set in which the site is located, the first control frame is used to notify the access point that there is an idle channel.
  • the specific implementation manner that the first processing module determines that the station causes interference to the data transmission in the basic service set may be: determining that the received power of the station is greater than the idle channel assessment CCA threshold or the overlapping basic service set OBSS CCA threshold.
  • the method may be: transmitting, by using at least two idle channels, a first control frame to the access point.
  • the site described in this embodiment is configured to feed back a second control frame or update the NAV when receiving the identifier of the BSS that is sent by the access point, so as to improve bandwidth utilization without interfering with data transmission.
  • the purpose of the rate is configured to feed back a second control frame or update the NAV when receiving the identifier of the BSS that is sent by the access point, so as to improve bandwidth utilization without interfering with data transmission. The purpose of the rate.
  • FIG. 18 Another site disclosed in the embodiment of the present application, as shown in FIG. 18, includes:
  • the second receiving module 1801 is configured to receive a first control frame sent by the access point, where the first control frame includes a first Duration field and carries an identifier of the basic service set and an identifier of the station in the basic service set;
  • the second processing module 1802 is configured to: when the site is in the basic service set, and the identifier of the site is carried in the first control frame, return a second control frame to the access point, where The second control frame carries the identifier of the basic service set; if the site is in the basic service set but the identifier is not carried in the first control frame, at least according to the value of the first Duration field, Updating the NAV; if the site is not in the basic service set and causing interference to data transmissions within the basic service set, updating the NAV based at least on the value of the first Duration field.
  • the third sending module 1803 is configured to: before receiving the first control frame sent by the access point, hear the idle channel; send the first control frame to the access point, where the first control frame carries An identifier of a basic service set in which the site is located, the first control frame is used to notify the access point that there is an idle channel.
  • the frame structure of the second control frame can be referred to the foregoing method embodiment, and details are not described herein again.
  • the specific implementation manner that the second processing module determines that the station interferes with the data transmission in the basic service set may be: determining that the received power of the station is greater than the idle channel assessment CCA threshold or the overlapping basic service set OBSS CCA threshold.
  • the specific implementation manner that the second processing module returns the second control frame to the access point may be: sending the first control frame to the access point by using at least two idle channels.
  • the station described in this embodiment is used to receive the BSS carrying the identifier sent by the access point.
  • the second control frame is fed back or the NAV is updated to achieve the purpose of improving bandwidth utilization without interfering with data transmission.
  • a transmitter configured to send a first control frame, where the first control frame includes a first Duration field and carries an identifier of a basic service set, where a value of the first Duration field is used to indicate the access point and the basic The length of protection required for data transfer between sites within a service set;
  • a processor configured to perform data transmission between the station and the base service if the identifier of the basic service set carried by the second control frame is the same as the identifier of the basic service set carried by the first control frame.
  • a memory that stores programs in the processor and data generated during the running of the program.
  • the transmitter, the processor and the memory can communicate via the bus.
  • a receiver configured to receive a first control frame sent by an access point, where the first control frame includes a first Duration field and carries an identifier of a basic service set;
  • a processor configured to: when the site is in the basic service set, reply to the access point with a second control frame, where the second control frame carries an identifier of the basic service set; if the site is not Within the basic service set and causing interference to data transmissions within the basic service set, the NAV is updated based at least on the value of the first Duration field.
  • a memory that stores programs in the processor and data generated during the running of the program.
  • the receiver, the processor and the memory can communicate via the bus.
  • a receiver configured to receive a first control frame sent by an access point, where the first control frame includes a first Duration field and carries an identifier of a basic service set and an identifier of a site that is in the basic service set;
  • a processor configured to: when the site is in the basic service set, and the identifier of the site is carried in the first control frame, return a second control frame to the access point, where the second control The frame carries the identifier of the basic service set; if the site is in the basic service set but the identifier is not carried in the first control frame, updating the NAV according to at least the value of the first Duration field; If the site is not in the basic service set and interferes with data transmissions within the basic service set, the NAV is updated based at least on the value of the first Duration field.
  • a memory that stores programs in the processor and data generated during the running of the program.
  • the receiver, the processor and the memory can communicate via the bus.
  • the functions described in the method of the present embodiment can be stored in a computing device readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, a portion of the embodiments of the present invention that contributes to the prior art or a portion of the technical solution may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for causing a
  • the computing device (which may be a personal computer, server, mobile computing device, or network device, etc.) performs all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

本申请公开的数据传输方法，接入点在确认信道空闲后，发送控制第一控制帧，第一控制帧包括第一Duration字段并携带基本服务集的标识，站点在接收到第一控制帧后，如果此站点处于所述基本服务集内，此站点向接入点回复第二控制帧，第二控制帧中携带此基本服务器的标识，接入点接收到第二控制帧后，与站点进行数据传输，如果站点未处于此基本服务集内且对所述基本服务集内的数据传输造成干扰，站点依据第一Duration字段的值，更新NAV,所以，能够规避干扰，又因为接入点允许此基本服务集内的站点参与通信，而一个基本服务集内通常有多个站点，所以，在一段时间内，不仅仅只有一个站点可以进行数据传输，从而提高带宽利用率。

Description

一种数据传输控制方法及接入点、站点 技术领域
本申请涉及通信领域，尤其涉及一种数据传输控制方法及接入点、站点。
背景技术
在IEEE 802.11g无线局域网(Wireless Local Area Network，WLAN)中系统，为了保护数据帧不受发送端和接收端的临近站点的干扰，如图1所示，发送端在发送数据帧之前，发送端发送请求发送(Request to Send，控制)帧，接收端在接收到RTS后，回复允许发送(Clear to Send，控制响应)帧，在RTS和CTS中均携带有持续时间Duration字段，用于告知接收端和发送端间的数据传输过程所需的保护时长，所述保护时长不小于接收端和发送端间的数据传输过程所占用的时长，除发送端和接收端之外的其它站点依据Duration字段的值，设置各自的网络分配矢量(Network Allocation Vector，NAV)，NAV用于站点在发送端和接收端进行数据传输的过程中保持静默。
可见，上述干扰规避机制，在同一段时间内，仅允许一个STA接入AP并传输数据，因此，以带宽利用率为代价规避干扰。所以，如何在规避干扰的前提下提高带宽利用率，成为目前亟待解决的问题。
发明内容
本申请提供了一种数据传输控制方法及接入点、站点，目的在于解决如何在规避干扰的前提下提高带宽利用率的问题。
为了实现上述目的，本申请提供了以下技术方案：
本申请的第一方面提供了一种数据传输控制方法，包括：
接入点发送第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识，所述第一Duration字段的值用于表示所述接入点与所述基本服务集内的站点之间进行数据传输所需的保护时长；
如果站点反馈的第二控制帧携带的基本服务集的标识与所述第一控制帧携带的所述基本服务集的标识相同，所述接入点与所述站点间进行数据传输。
本申请的第二方面提供了又一种数据传输控制方法，包括：
站点接收接入点发送的第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识；
如果所述站点处于所述基本服务集内，则所述站点向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；
如果所述站点未处于所述基本服务集内且对所述基本服务集内的数据传输造成干扰，则所述站点至少依据所述第一Duration字段的值，更新NAV。
本申请的第三方面提供了又一种数据传输控制方法，包括：
站点接收接入点发送的第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识以及处于所述基本服务集内的站点的标识；
如果所述站点处于所述基本服务集内且所述站点的标识携带在所述第一控制帧中，则所述站点向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；
如果所述站点处于所述基本服务集内但所述站点的标识未携带在所述第一控制帧中，则所述站点至少依据所述第一Duration字段的值，更新NAV。
本申请的第四方面提供了一种接入点，包括：
第一发送模块，用于在确认信道空闲后，发送第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识，所述第一Duration字段的值用于表示所述接入点与所述基本服务集内的站点之间进行数据传输所需的保护时长；
数据传输模块，用于如果站点反馈的第二控制帧携带的基本服务集的标识与所述第一控制帧携带的所述基本服务集的标识相同，与所述站点间进行数据传输。
本申请的第五方面提供了一种站点，包括：
第一接收模块，用于接收接入点发送的第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识；
第一处理模块，用于如果所述站点处于所述基本服务集内，则向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；如果所述站点未处于所述基本服务集内且对所述基本服务集内的数据传输造成干扰，则至少依据所述第一Duration字段的值，更新NAV。
本申请的第六方面提供了又一种站点，包括：
第二接收模块，用于接收接入点发送的第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识以及处于所述基本服务集内的站点的标识；
第二处理模块，用于如果所述站点处于所述基本服务集内且所述站点的标识携带在所述第一控制帧中，则向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；如果所述站点处于所述基本服务集内但所述站点的标识未携带在所述第一控制帧中，则至少依据所述第一Duration字段的值，更新NAV。
本申请公开的数据传输方法，接入点在确认信道空闲后，发送控制第一控制帧，第一控制帧基于媒体接入控制MAC层协议的帧格式中包括第一Duration字段并携带基本服务集的标识，站点在接收到第一控制帧后，如果此站点处于所述基本服务集内，此站点向接入点回复第二控制帧，第二控制帧中携带此基本服务器的标识，接入点接收到第二控制帧后，与站点进行数据传输，如果站点未处于此基本服务集内且对所述基本服务集内的数据传输造成干扰，站点依据第一Duration字段的值，更新NAV；
或者，第一控制帧基于媒体接入控制MAC层协议的帧格式中包括第一Duration字段并携带基本服务集的标识以及处于基本服务集内的站点的标识，站点在接收到第一控制帧后，如果此站点处于所述基本服务集内且站点的标识携带在第一控制帧中，此站点向接入点回复第二控制帧，第二控制帧中携带此基本服务器的标识，如果站点处于所述基本服务集内但其标识未携带在所述第一控制帧中，或未处于基本服务集内且对基本服务集 内的数据传输造成干扰，则站点至少依据第一Duration字段的值，更新NAV。
因为NAV可以使得站点在接入点与其它处于所述基本服务集内的站点的数据传输过程中保持静默，所以，能够规避干扰，又因为接入点允许此基本服务集内的站点参与通信，而一个基本服务集内通常有多个站点，所以，在一段时间内，不仅仅只有一个站点可以进行数据传输，从而能够提高带宽利用率。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为WLAN系统中发送节点和接收节点的数据传输示意图；
图2为WLAN的通信场景示意图；
图3为本发明实施例公开的一种数据传输控制方法的流程图；
图4为本发明实施例公开的又一种数据传输控制方法的流程图；
图5为本发明实施例公开的第一类型第一控制帧基于MAC层协议的帧结构的示意图；
图6为本发明实施例公开的第一类型第一控制帧及第二类型第一控制帧基于物理层协议的帧结构的示意图；
图7为本发明实施例公开的第二控制帧基于MAC层协议的一种帧结构的示意图；
图8为图7所示的第二控制帧基于物理层协议的一种帧结构的示意图；
图9为本申请实施例公开的又一种数据传输控制方法的流程图；
图10为本申请实施例公开的第二类型第一控制帧基于MAC层协议的帧结构的示意图；
图11本申请实施例公开的又一种数据传输控制方法的流程图；
图12本申请实施例公开的多个信道传输的示意图；
图13为图7所示的第二控制帧基于物理层协议的又一种帧结构的示意图；
图14为本申请实施例公开的又一种数据传输控制方法的流程图；
图15为本申请实施例公开的第二控制帧基于MAC层协议的又一种帧结构的示意图；
图16为本申请实施例公开的一种接入点的结构示意图；
图17为本申请实施例公开的一种站点的结构示意图；
图18为本申请实施例公开的又一种站点的结构示意图。
具体实施方式
本申请实施例公开了一种数据传输控制方法及接入点、站点，本申请实施例中所述的接入点和站点相比于现有技术，均具备了新的功能，而本申请实施例所述的接入点及站点可以应用在现有的WLAN系统中，即与现有的WLAN系统中的设备兼容使用。如图2所示，所述WLAN系统中包括接入点和多个站点，为了与现有的WLAN设备进行区分，图2中，(高性能WLAN，High Efficiency WLAN)HEW-AP为本申请实施例公开的接入点，HEW-STA为本申请实施例公开的站点，而Legacy(传统)-STA为传统的站点，站点可以在HEW与Legacy模式之间进行转换。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
实施例一
本申请实施例公开的一种数据传输控制方法，描述AP竞争成功并指示STA进行数据传输的过程，包括以下步骤：
步骤一：HEW-AP侦听信道；
HEW-AP侦听信道，并在信道空闲时尝试发送第二类型第一控制帧(又可以称为MU-RTS)。每个MU-RTS占用20MHz的带宽。
步骤二：HEW-AP成功发送第二类型第一控制帧(又可以称为MU-RTS)；
HEW-AP竞争到了信道，成功发送MU-RTS。MU-RTS与传统的RTS帧在格式和内容有些区别，其在物理层的帧格式如图6所示，在MAC的帧格式如图10所示，其各个部分的赋值和含义如下所述：
Frame Control:与传统的RTS在subtype value上不同，例如是0101(该值可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)；并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
Duration：设置为后续数据传输的时长+3倍SIFS+CTS时长+数据触发帧的时长；传统的STA和未在MU-RTS中被调度的HEW-STA将根据此值更新NAV，而MU-RTS中调度的HEW-STA则通过此值判断数据传输的大小；
TA：重新定义为4个接收上行发送STA的部分关联标识(PAID)，其中PAID为12比特，并且依序排列(依序编号为1，2，3，4)，4个PAID共48比特。
RA：重新定义为4个接收上行发送STA的部分关联标识(PAID)，其中PAID为12比特，并且依序排列(依序编号为5，6，7，8)，4个PAID共48比特。
FCS：与传统的RTS按照一样的方法设置。
上述每个字段的功能为：
Frame Control：protocol version用来设置协议版本。Type value用来设置帧的大致类型。Subtype value用来设置帧的具体类型。BSS color用来设置BSS的标识信息。
Duration：用来设置所需要保护的时间长度信息。
TA：在现有技术中设置发送节点的MAC地址，共48比特。在本方案中用来设置前4个STA的部分关联标识。
RA：在现有技术中设置接收节点的MAC地址，共48比特。在本方案中用来设置后4个STA的部分关联标识。
FCS：与现有技术一样，CRC校验比特信息，用来校验MAC层的帧正确与否。
步骤三：HEW-STA在收到MU-RTS后根据PAID指示发送第二控制帧，或者更新NAV；
HEW-STA收到HEW-AP发送的MU-RTS，根据HEW-RTS中指示的BSS color来确定是否是本BSS，根据其中指示的PAID来确定是否需要回复第二控制帧。如果确定不回复第二控制帧，那么根据MU-RTS中的duration来更新NAV。
第二控制帧的格式可以如图13所示(图13所示的第二控制帧还可以称为MU-CTS)，让HEW-AP知道是哪个HEW-STA回复的第二控制帧；也可以如图8所示(图8所示的第二控制帧还可以称为eCTS)，不需要让HEW-AP来区分是哪个HEW-STA回复的第二控制帧。
所有的HEW-STA都回复相同格式的第二控制帧，即或者都回复如图13所示的第二控制帧，或者都回复如图8所示的第二控制帧。
第二控制帧基于MAC层协议的帧结构如图7所示。
MU-CTS由新增加的OFDM符号与传统的CTS组成，新增加的OFDM符号和传统的CTS都是如图8所示独立的PHY层的帧。其在物理层的帧格式如图8所示，在MAC的帧格式如图9所示，其各个部分的赋值和含义如下所述：
Frame Control:与传统的CTS在subtype value上不同，是0100(该值可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)；并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
Duration：设置为RTS中的duration减去SIFS再减去CTS时长；传统的STA和未在MU-RTS中被调度的HEW-STA将根据此值更新NAV，而MU-RTS中调度的HEW-STA则通过此值判断数据传输的大小；
RA：设置成一个提前约定好的参数或数值，或者是BSSID。
FCS：与传统的CTS按照一样的方法设置。
TBD：设置成一个小于等于SIFS的时间长度，用来分隔新增加的OFDM符号和传统的CTS。
新增加的OFDM符号：可以分成N个RU，其中N大于等于8，例如N可以等于9。那么分配其中8个RU按照顺序对应MU-RTS中的8个PAID， HEW-STA在回复MU-CTS的时候在对应的RU发送PAID或者STA ID，以便HEW-AP知道是哪个STA回复的MU-CTS。
步骤四：传统STA收到MU-RTS、MU-CTS/eCTS中的任意一个，根据其中的Duration值，更新NAV；
本实施例中，STA更新NAV的依据为：
1、STA首先判断frame control里的protocol version、type value以及subtype value是否是STA已知的值。如果是未知的值，那么就读取duration字段并更新NAV。
2、如果STA发现上述三个字段的值已知，那么读取RA，并判断是否是发送给自己的帧。如果不是发送给自己的，那么就读取duration字段并更新NAV。
步骤五：HEW-AP收到MU-CTS，发送数据触发帧，并且调整触发帧中的资源分配信息；
HEW-AP收到eCTS，发送数据触发帧。
步骤六：HEW-STA在接收到数据触发帧后，根据数据触发帧中的资源分配指示信息确定是否发送数据。
实施例二
本申请实施例公开的又一种数据传输控制方法，描述AP竞争成功并向STA发送数据的过程，包括以下步骤：
步骤一：HEW-AP侦听信道；
HEW-AP侦听信道，并在信道空闲时尝试发送MU-RTS。每个MU-RTS占用20MHz的带宽。
步骤二：HEW-AP成功发送MU-RTS；
HEW-AP竞争到了信道，成功发送MU-RTS。MU-RTS与传统的RTS在格式和内容有些区别，其在物理层的帧格式如图6所示，在MAC的帧格式 如图10所示，其各个部分的赋值和含义如下所述：
Frame Control:与传统的RTS在subtype value上不同，例如是0101(该值可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)；并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
Duration：设置为后续数据传输的时长+2倍SIFS+CTS时长的时长；传统的STA和未在MU-RTS中被调度的HEW-STA将根据此值更新NAV，而MU-RTS中调度的HEW-STA则通过此值判断数据传输的大小；
TA：重新定义为4个接收上行发送STA的部分关联标识(PAID)，其中PAID为12比特，并且依序排列(依序编号为1，2，3，4)，4个PAID共48比特。
RA：重新定义为4个接收上行发送STA的部分关联标识(PAID)，其中PAID为12比特，并且依序排列(依序编号为5，6，7，8)，4个PAID共48比特。
FCS：与传统的RTS按照一样的方法设置。
步骤三：HEW-STA在收到MU-RTS后根据PAID指示发送MU-CTS/eCTS，或者更新NAV；
HEW-STA收到HEW-AP发送的MU-RTS，根据HEW-RTS中指示的BSS color来确定是否是本BSS，根据其中指示的PAID来确定是否需要回复MU-CTS/eCTS。如果确定不回复MU-CTS/eCTS，那么根据MU-RTS中的duration来更新NAV。如果确定要回复MU-CTS，根据如下格式回复，并且让HEW-AP知道是哪个HEW-STA回复的MU-CTS。
如果确定要回复eCTS，根据如图7和图8的格式回复，不需要让HEW-AP来区分是哪个HEW-STA回复的eCTS。
所有的HEW-STA都回复相同格式的CTS，即或者都回复MU-CTS，或者都回复eCTS。
MU-CTS由新增加的OFDM符号与传统的CTS组成，新增加的OFDM符号和传统的CTS都是如图13所示独立的PHY层的帧。其在物理层的帧格式如图13所示，在MAC的帧格式如图7所示，其各个部分的赋值和含义如下所述：
Frame Control:与传统的CTS在subtype value上不同，是0100(该值可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)；并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
Duration：设置为RTS中的duration减去SIFS再减去CTS时长；传统的STA和未在MU-RTS中被调度的HEW-STA将根据此值更新NAV，而MU-RTS中调度的HEW-STA则通过此值判断数据传输的大小；
RA：设置成一个提前约定好的参数或数值，或者是BSSID。
FCS：与传统的CTS按照一样的方法设置。
TBD：设置成一个小于等于SIFS的时间长度，用来分隔新增加的OFDM符号和传统的CTS。
新增加的OFDM符号：可以分成N个RU，其中N大于等于8，例如N可以等于9。那么分配其中8个RU按照顺序对应MU-RTS中的8个PAID，HEW-STA在回复MU-CTS的时候在对应的RU发送PAID或者STA ID，以便 HEW-AP知道是哪个STA回复的MU-CTS。
步骤四：传统STA收到MU-RTS、MU-CTS中的任意一个，根据其中的Duration值，更新NAV；
步骤五：HEW-AP收到MU-CTS，并确定向哪些STA发送数据；
HEW-AP收到eCTS，准备发送数据帧。
实施例三
本申请实施例公开的一种数据传输控制方法，描述AP竞争多个20MHz信道成功并指示STA进行数据传输的过程，本实施例中，HEW-AP和HEW-STA在每个20MHz信道上均执行实施例一所述的方法。
实施例四
本申请实施例公开的一种数据传输控制方法，描述AP竞争多个20MHz信道成功并指示STA进行数据传输的过程，本实施例中，HEW-AP和HEW-STA在每个20MHz信道上均执行实施例二所述的方法。
实施例五
本申请实施例公开的一种数据传输控制方法，描述STA竞争成功并把OFDMA调度控制权交给AP，由AP调度STA发送数据的过程，包括以下步骤：
步骤一：HEW-STA侦听信道，并发送第一类型第一控制帧(也可以称为eRTS)；
HEW-STA侦听信道，并在信道空闲时尝试发送eRTS(这里也可能使用传统RTS，但是传统RTS中需要用RA里的AP的MAC地址来区分是哪个BSS)。其中eRTS使用如图5和图6定义的格式，每个RTS占用20MHz的带 宽。
其中：
Frame Control:与传统的RTS在subtype value上不同，例如是0101(该值可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)；并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
如果subtype或者protocol version与传统的RTS不同，那么BSS color可以完全利用比特8到比特15。如果subtype或者protocol version与传统的RTS相同，那么需要用1比特来指示这是eRTS，例如比特13，用其他剩余7个比特来指示BSS color。
Duration：设置为估计的后续数据传输的时长+2倍SIFS+MU-RTS时长；传统的STA和其他的HEW-STA将根据此值更新NAV，而对应的HEW-AP则通过此值判断数据传输的大小；
TA：HEW-STA的MAC地址。
RA：HEW-AP的MAC地址。
FCS：与传统的RTS按照一样的方法设置。
步骤二：HEW-AP成功发送第二类型第一控制帧(也可以称为MU-RTS)；
HEW-AP竞争到了信道，成功发送MU-RTS。MU-RTS与传统的RTS在格式和内容有些区别，其在物理层的帧格式如图6所示，在MAC层的帧格式如图10所示，其各个部分的赋值和含义如下所述：
Frame Control:与传统的RTS在subtype value上不同，例如是0101(该值 可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)；并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
Duration：设置为后续数据传输的时长+3倍SIFS+CTS时长+数据触发帧的时长；传统的STA和未在MU-RTS中被调度的HEW-STA将根据此值更新NAV，而MU-RTS中调度的HEW-STA则通过此值判断数据传输的大小；
TA：重新定义为4个接收上行发送STA的部分关联标识(PAID)，其中PAID为12比特，并且依序排列(依序编号为1，2，3，4)，4个PAID共48比特。
RA：重新定义为4个接收上行发送STA的部分关联标识(PAID)，其中PAID为12比特，并且依序排列(依序编号为5，6，7，8)，4个PAID共48比特。
FCS：与传统的RTS按照一样的方法设置。
步骤三：HEW-STA在收到MU-RTS后根据PAID指示发送第二控制帧，或者更新NAV；
HEW-STA收到HEW-AP发送的MU-RTS，根据HEW-RTS中指示的BSS color来确定是否是本BSS，根据其中指示的PAID来确定是否需要回复第二控制帧。如果确定不回复第二控制帧，那么根据MU-RTS中的duration来更新NAV。
如果确定要回复第二控制帧，第二控制帧在MAC层的帧格式如图7所示，在物理层的帧结构可以如图13所示(如图13所示的第二控制帧还可以称为MU-CTS)，让HEW-AP知道是哪个HEW-STA回复的MU-CTS；或者， 第二控制帧在物理层的帧结构还可以如图8所示(如图8所示的第二控制帧还可以称为eCTS)，不需要让HEW-AP来区分是哪个HEW-STA回复的eCTS。
所有的HEW-STA都回复相同格式的CTS，即或者都回复MU-CTS，或者都回复eCTS。
MU-CTS由新增加的OFDM符号与传统的CTS组成，新增加的OFDM符号和传统的CTS都是如图13所示独立的PHY层的帧。其在物理层的帧格式如图13所示，在MAC的帧格式如图7所示，其各个部分的赋值和含义如下所述：
Frame Control:与传统的CTS在subtype value上不同，是0100(该值可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)；并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
Duration：设置为RTS中的duration减去SIFS再减去CTS时长；传统的STA和未在MU-RTS中被调度的HEW-STA将根据此值更新NAV，而MU-RTS中调度的HEW-STA则通过此值判断数据传输的大小；
RA：设置成一个提前约定好的参数或数值，或者是BSSID。
FCS：与传统的CTS按照一样的方法设置。
TBD：设置成一个小于等于SIFS的时间长度，用来分隔新增加的OFDM符号和传统的CTS。
新增加的OFDM符号：可以分成N个RU，其中N大于等于8，例如N可以等于9。那么分配其中8个RU按照顺序对应MU-RTS中的8个PAID， HEW-STA在回复MU-CTS的时候在对应的RU发送PAID或者STA ID，以便HEW-AP知道是哪个STA回复的MU-CTS。
步骤四：传统STA收到MU-RTS、MU-CTS中的任意一个，根据其中的Duration值，更新NAV；
步骤五：HEW-AP收到MU-CTS，发送数据触发帧，并且调整触发帧中的资源分配信息；
步骤六：HEW-STA在接收到数据触发帧后，根据数据触发帧中的资源分配指示信息确定是否发送数据。
实施例六
本申请实施例公开的一种数据传输控制方法，描述STA竞争成功并把OFDMA调度控制权交给AP，由AP向STA发送数据的过程，具体包括以下步骤：
步骤一：HEW-STA侦听信道，并发送eRTS；
HEW-STA侦听信道，并在信道空闲时尝试发送eRTS(这里也可能使用传统RTS，但是传统RTS中需要用RA里的AP的MAC地址来区分是哪个BSS)。其中eRTS使用如图5和图6定义的方式，每个RTS占用20MHz的带宽。
Frame Control:与传统的RTS在subtype value上不同，例如是0101(该值可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)； 并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
如果subtype或者protocol version与传统的RTS不同，那么BSS color可以完全利用比特8到比特15。如果subtype或者protocol version与传统的RTS相同，那么需要用1比特来指示这是eRTS，例如比特13，用其他剩余7个比特来指示BSS color。
Duration：设置为估计的后续数据传输的时长+2倍SIFS+MU-RTS时长；传统的STA和其他的HEW-STA将根据此值更新NAV，而对应的HEW-AP则通过此值判断数据传输的大小；
TA：HEW-STA的MAC地址。
RA：HEW-AP的MAC地址。
FCS：与传统的RTS按照一样的方法设置。
步骤二：HEW-AP发送MU-RTS；
HEW-AP接收到eRTS，那么发送MU-RTS。MU-RTS与传统的RTS在格式和内容有些区别，其在物理层的帧格式如图6所示，在MAC的帧格式如图10所示，其各个部分的赋值和含义如下所述：
Frame Control:与传统的RTS在subtype value上不同，例如是0101(该值可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)；并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
Duration：设置为后续数据传输的时长+2倍SIFS+CTS时长的时长；传统的STA和未在MU-RTS中被调度的HEW-STA将根据此值更新NAV，而MU-RTS中调度的HEW-STA则通过此值判断数据传输的大小；
TA：重新定义为4个接收上行发送STA的部分关联标识(PAID)，其中PAID为12比特，并且依序排列(依序编号为1，2，3，4)，4个PAID共48比特。
RA：重新定义为4个接收上行发送STA的部分关联标识(PAID)，其中PAID为12比特，并且依序排列(依序编号为5，6，7，8)，4个PAID共48比特。
FCS：与传统的RTS按照一样的方法设置。
步骤三：HEW-STA在收到MU-RTS后根据PAID指示发送MU-CTS/eCTS，或者更新NAV；
HEW-STA收到HEW-AP发送的MU-RTS，根据HEW-RTS中指示的BSS color来确定是否是本BSS，根据其中指示的PAID来确定是否需要回复MU-CTS/eCTS。如果确定不回复MU-CTS/eCTS，那么根据MU-RTS中的duration来更新NAV。如果确定要回复MU-CTS，根据图13及图7所示的格式回复，让HEW-AP知道是哪个HEW-STA回复的MU-CTS。
如果确定要回复eCTS，根据如图7和图8的格式回复，不需要让HEW-AP来区分是哪个HEW-STA回复的eCTS。
所有的HEW-STA都回复相同格式的CTS，即或者都回复MU-CTS，或者都回复eCTS。
MU-CTS由新增加的OFDM符号与传统的CTS组成，新增加的OFDM符号和传统的CTS都是如图13所示独立的PHY层的帧。其在物理层的帧格式如图13所示，在MAC的帧格式如图7所示，其各个部分的赋值和含义如下所述：
Frame Control:与传统的CTS在subtype value上不同，是0100(该值可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)；并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
Duration：设置为RTS中的duration减去SIFS再减去CTS时长；传统的STA和未在MU-RTS中被调度的HEW-STA将根据此值更新NAV，而MU-RTS中调度的HEW-STA则通过此值判断数据传输的大小；
RA：设置成一个提前约定好的参数或数值，或者是BSSID。
FCS：与传统的CTS按照一样的方法设置。
TBD：设置成一个小于等于SIFS的时间长度，用来分隔新增加的OFDM符号和传统的CTS。
新增加的OFDM符号：可以分成N个RU，其中N大于等于8，例如N可以等于9。那么分配其中8个RU按照顺序对应MU-RTS中的8个PAID，HEW-STA在回复MU-CTS的时候在对应的RU发送PAID或者STA ID，以便HEW-AP知道是哪个STA回复的MU-CTS。
步骤四：传统STA收到MU-RTS、MU-CTS中的任意一个，根据其中的Duration值，更新NAV；
步骤五：HEW-AP收到HEW-CTS，并确定向哪些STA发送数据。
实施例七
本实施例描述STA竞争多个20MHz信道成功并由AP来调度指示STA进行数据传输的过程。HEW-AP和HEW-STA在每个20MHz信道上执行实施例 五的方法。
实施例八
本实施例描述STA竞争多个20MHz信道成功并由AP来调度向STA发送数据的过程。HEW-AP和HEW-STA在每个20MHz信道上执行实施例六的方法。
实施例九
本申请实施例公开的一种数据传输控制方法，描述AP竞争成功并指示STA进行数据传输的过程，包括以下步骤：
步骤一：HEW-AP侦听信道；
HEW-AP侦听信道，并在信道空闲时尝试发送eRTS。每个eRTS占用20MHz的带宽。
步骤二：HEW-AP成功发送eRTS；
HEW-AP竞争到了信道，成功发送eRTS。eRTS与传统的RTS在格式和内容有些区别，其在物理层的帧格式如图6所示，在MAC的帧格式如图5所示，其各个部分的赋值和含义如下所述：
Frame Control:与传统的RTS在subtype value上不同，例如是0101(该值可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)；并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
如果subtype或者protocol version与传统的RTS不同，那么BSS color可以完全利用比特8到比特15。如果subtype或者protocol version与传统的RTS相同，那么需要用1比特来指示这是eRTS，例如比特13，用其他剩余7个比特来指示BSS color。
Duration：设置为估计的后续数据传输的时长+3倍SIFS+MU-RTS时长+触发帧时长；传统的STA和其他的HEW-STA将根据此值更新NAV，而对应的HEW-AP则通过此值判断数据传输的大小；
TA：HEW-AP的MAC地址。
RA：设置成一个提前约定好的参数或数值，或者是BSSID。
FCS：与传统的RTS按照一样的方法设置。
步骤三：HEW-STA在收到eRTS后回复eCTS，或者更新NAV；
HEW-STA收到HEW-AP发送的eRTS，根据eRTS中指示的BSS color来确定是否是本BSS来确定是否需要回复eCTS。如果确定不回复eCTS，那么根据eRTS中的duration来更新NAV。
如果确定要回复eCTS，根据如图8和图7的格式回复，不需要让HEW-AP来区分是哪个HEW-STA回复的eCTS。
所有的HEW-STA都回复相同格式的CTS，即都回复eCTS。
eCTS在物理层的帧格式如图8所示，在MAC的帧格式如图7所示，其各个部分的赋值和含义如下所述：
Frame Control:与传统的CTS在subtype value上不同，是0100(该值可以定义为其他未使用的值)；或者与传统的RTS在protocol version上不同，例如是01(现有标准中仅使用00，因此可以可写为除了00以外的其他值)； 并且比特8到比特15重新定义为BSS color，来指示BSS的信息。
如果subtype或者protocol version与传统的RTS不同，那么BSS color可以完全利用比特8到比特15。如果subtype或者protocol version与传统的RTS相同，那么需要用1比特来指示这是eCTS，例如比特13，用其他剩余7个比特来指示BSS color。
Duration：设置为RTS中的duration减去SIFS再减去CTS时长；传统的STA和其他的HEW-STA将根据此值更新NAV；
RA：设置成一个提前约定好的参数或数值，或者是BSSID。
FCS：与传统的CTS按照一样的方法设置。
步骤四：传统STA收到eRTS或eCTS中的任意一个，根据其中的Duration值，更新NAV；
步骤五：HEW-AP收到eCTS，发送数据触发帧。
步骤六：HEW-STA在接收到数据触发帧后，根据数据触发帧中的资源分配指示信息确定是否发送数据。
实施例十
本申请实施例公开的一种数据传输控制方法，描述AP竞争成功并向STA发送数据的过程，包括以下步骤：
步骤一：HEW-AP侦听信道；
HEW-AP侦听信道，并在信道空闲时尝试发送eRTS。每个eRTS占用20MHz的带宽。
步骤二：HEW-AP成功发送eRTS；
步骤三：HEW-STA在收到eRTS后根据PAID指示发送eCTS，或者更新NAV；
HEW-STA收到HEW-AP发送的eRTS，根据eRTS中指示的BSS color来确定是否是本BSS来确定是否需要回复eCTS。如果确定不回复eCTS，那么根据eRTS中的duration来更新NAV。
所有的HEW-STA都回复相同格式的CTS，即都回复eCTS。
步骤四：传统STA收到eRTS或eCTS中的任意一个，根据其中的Duration值，更新NAV；
步骤五：HEW-AP收到eCTS，准备发送数据帧。
本实施例中，eRTS及eCTS的帧格式均可以参见其它实施例所述，这里不再赘述。
实施例十一
按照类似实施例七的方式实现多个信道的过程。
实施例十二
按照类似实施例八的方式实现多个信道的过程。
实施例十三
针对上述所有实施例中的eCTS的MAC层格式，可以有另一种实现方式，如图15所示。
此处不修改frame control部分的后8比特，而把BSS color信息放在RA字 段与FCS字段之间。
实施例十四
在实施例一、二、五和六中，传统STA收到MU-RTS、MU-CTS/eCTS中的任意一个，根据其中的Duration值，更新NAV。
MU-RTS中不包含对应身份标识的HEW-STA的NAV更新规则可以选择如下规则中的任意一个：
1.根据现有标准规则，更新NAV；
2.由BSS color判断是否是本BSS的帧，如果是本BSS则更新NAV，如果不是本BSS则不更新NAV；
3.由BSS color判断是否是本BSS的帧，如果不是本BSS并且满足预设条件则不更新NAV，如果是本BSS或者不是本BSS且不满足预设条件则更新NAV。
其中，预设条件可以是小于CCA阈值或者OBSS的CCA阈值等。
实施例九和十中，传统STA收到eRTS、eCTS中的任意一个，根据其中的Duration值，更新NAV。
HEW-STA的NAV更新规则可以选择如下规则中的任意一个：
1.根据现有标准规则，更新NAV；
2.由BSS color判断是否是本BSS的帧，如果是本BSS则更新NAV，如果不是本BSS则不更新NAV；
3.由BSS color判断是否是本BSS的帧，如果是本BSS或者不是本BSS并 且满足预设条件则不更新NAV，如果是不是本BSS且不满足预设条件则更新NAV。
其中，预设条件可以是小于CCA阈值或者OBSS的CCA阈值等。
实施例十五
本申请实施例公开的一种数据传输控制方法，如图3所示，包括以下步骤：
S301：接入点在确认信道空闲后，发送第一控制帧；
本实施例中，第一控制帧基于媒体接入控制MAC层协议的帧格式中包括第一Duration字段并携带基本服务集的标识，具体地，基本服务集的标识可以为Basic Service Set color，简称BSS color，BSS color用于告知处于此BSS内的站点参与数据传输。
第一Duration字段的值用于表示接入点与此BSS内的站点之间进行数据传输所需的保护时长，通常，此保护时长不小于接入点与此BSS内的站点之间进行数据传输的时间。
S302：站点在接收上述第一控制帧后，站点判断是否处于此BSS内，如果是，执行S303，如果否，执行S304；
S303：站点向接入点回复第二控制帧；
本实施例中，第二控制帧基于MAC层协议的帧结构中携带上述BSS color，其目的在于向接入点表明此站点为接入点允许参与数据传输的站点。
S304：如果站点未处于BSS内且对所述基本服务集内的数据传输造成干扰，站点依据第一Duration字段的值，更新NAV。
具体地，对所述基本服务集内的数据传输造成干扰可以为：站点的接收功率大于空闲信道评估(clear channel assessment，CCA)阈值或者重叠的基本服务集(overlapping Basic Service Set，OBSS)的CCA阈值。也就是说，虽然站点不处于将要进行的数据传输所在的BSS内，但是因为站点满足上述条件，所以站点会对数据传输造成干扰，为了规避干扰，所以，即使站点不在上述BSS内，仍然要更新站点的NAV。
S305：如果站点反馈的第二控制帧基于MAC层协议的帧格式中携带所述BSS color，接入点与此站点间进行数据传输。
从上述步骤可以看出，本实施例中，在第一控制帧内携带第一Duration字段，用于不参与数据传输的STA更新NAV，以便于在其它STA进行数据传输期间保持静默，从而避免对传输中的数据帧造成干扰。
并且，本实施例中，接入点以帧结构为载体告知一个BSS内的STA参与通信，通常一个BSS内包括多个STA，所以在同一个时期内，接入点可以跟多个STA进行数据传输，从而实现提高带宽利用率的目的。
实施例十六
本申请实施例公开的又一种数据传输控制方法，如图4所示，包括以下步骤：
S401：HEW-AP侦听信道；
S402：HEW-AP侦听到一个空闲信道后，在此空闲信道(例如20MHZ)发送第一类型第一控制帧；
本实施例中，第一类型第一控制帧基于MAC层协议的帧格式如图5所示，包括：
帧控制Frame Control字段(占用16比特)，具体包括协议版本protocol version字段(占用2比特)，用于设置协议的版本；类型Type字段(占用2比特)，用于设置帧的大致类型；Subtype value字段(占用4比特)，用于设置帧的具体类型；BSS color字段(占用8比特)，用于设置BSS的标识。为了与传统的RTS帧进行区分，可以将Subtype value字段的值设置为未被使用的数值，例如0101(传统的RTS帧为1011)，或者，将protocol version字段的值设置为未被使用的数值，例如01(传统的RTS帧为00)。如果subtype或者protocol version与传统的RTS帧不同，那么BSS color可以完全利用比特8到比特15。
如果subtype或者protocol version与传统的RTS帧相同，那么需要用1比特来指示这是第一类型第一控制帧，可以从BSS color 8个比特中的一个比特，例如比特15，与传统的RTS帧进行区分，用其他剩余7个比特 来指示BSS color。
进一步的，如果用比特15来指示，需要在现有标准对比特15置1的情况之外，再增加一个情况来置1，从而指示该第一类型第一控制帧包含BSS color。该情况下，说明当前发送设备是具备本申请所述功能(即11ax)的设备，而不是传统的设备。
第一Duration字段(占用16比特)，为了与第二控制帧中的Duration字段进行区分，这里命名为第一Duration字段。本实施例中，第一Duration字段的值为：估计的后续数据传输的时长+2倍短帧间间隔SIFS时长+第一类型第一控制帧的时长。Legacy-STA和未参与数据传输(未被调度)的HEW-STA将根据此值更新NAV，参与数据传输的HEW-STA将根据此值确定被传输的数据的大小。
接收端地址RA字段(占用48比特)，设置为一个预设的数值或参数，例如可以为BSSID。
发送端地址TA字段(占用48比特)，设置为HEW-AP的MAC地址。
帧校验序列(Frame Check Sequence，FCS)(占用32比特)，用于对所述接入点的MAC地址进行循环冗余检查(Cyclic Redundancy Check，CRC)校验。
第一类型第一控制帧基于物理层协议的帧格式与传统的RTS帧相同，如图6所示，包括传统的短训练域(Legacy Short Training Field，L-STF)字段、传统的长训练域(Legacy Long Training Field，L-LTF)字段、传统的信令域(Legacy Signal Field，L-SIG)字段以及数据data字段。
S403：HEW-STA依据Frame Control字段识别出第一类型第一控制帧后，确认是否处于所述BSS color指示的BSS内，如果是，执行S404，如果否，执行S405；
S404：HEW-STA向HEW-AP回复第二控制帧；
第二控制帧基于MAC层协议的帧结构如图7所示，包括：
帧控制Frame Control字段(占用16比特)，具体包括协议版本protocol version字段(占用2比特)，用于设置协议的版本；类型Type字段(占用2比特)，用于设置帧的大致类型；Subtype value字段(占用4比特)， 用于设置帧的具体类型；BSS color字段(占用8比特)，用于设置BSS的标识。为了与传统的RTS帧进行区分，可以将Subtype value字段的值设置为未被使用的数值，例如0101(传统的RTS帧为1100)，或者，将protocol version字段的值设置为未被使用的数值，例如01(传统的RTS帧为00)。如果subtype或者protocol version与传统的RTS帧不同，那么BSS color可以完全利用比特8到比特15。
如果subtype或者protocol version与传统的RTS帧相同，那么需要用1比特来指示这是第二控制帧，例如比特15，用其他剩余7个比特来指示BSS color。
进一步的，如果用比特15来指示这是第二控制帧，需要在现有标准对比特15置1的情况之外，再增加一个情况来置1，从而指示该第二控制帧包含BSS color。该情况下，说明当前发送设备是具备本申请所述功能(即11ax)的设备，而不是传统的设备。
第二Duration字段(占用16比特)。本实施例中，第一Duration字段的值为：估计的后续数据传输的时长+2倍短帧间间隔SIFS时长+数据触发帧的时长。
Legacy-STA和HEW-STA可以根据第二Duration字段的值更新NAV，而HEW-AP则通过此值判断数据传输的大小。
接收端地址RA字段(占用48比特)，设置为一个预设的数值或参数，例如可以为BSSID。
FCS字段(占用32比特)，用于对所述接入点的MAC地址进行CRC校验。
本实施例中，图7所示的第二控制帧基于物理层协议的帧结构如图8所示，包括：L-STF字段、L-LTF字段、L-SIG字段以及数据data字段。
也就是说，在本实施例中，此BSS内的所有HEW-STA均回复相同的第二控制帧，而无需HEW-AP区分是哪个HEW-STA回复的第二控制帧。
S405：如果未处于此BSS内且对此BSS内的数据传输造成干扰，HEW-STA依据第一类型第一控制帧中的第一Duration字段的值，或者第二控制帧中的第二字段的值(本实施例中两者相同)，来更新NAV；
S406(图中未画出)：Legacy-STA不能够识别第一类型第一控制帧，依据第一Duration字段的值，或者第二字段的值(本实施例中两者相同)，来更新NAV。
以上为数据传输的控制过程，在完成以上过程之后，HEW-AP和此BSS内的HEW-STA可以开始数据传输，具体地，上行传输可以过程为：HEW-AP接收到第二控制帧之后，向HEW-STA发送数据，下行传输过程可以为：HEW-AP接收到第二控制帧之后，向HEW-STA发送数据触发帧，HEW-STA接收到数据触发帧后，依据其中的资源分配指示信息确定是否发送数据。
从本实施例中的过程可以看出，通过对现有的RTS帧和CTS帧结构的改进，使得HEW-AP可以控制多个HEW-STA与其进行数据传输，从而提升资源利用率，并且，在第一类型第一控制帧帧和第二控制帧中均保留了Duration字段，使得不参与数据传输的站点且对数据传输有干扰的站点可以更新NAV，从而在数据帧传输期间保持静默，避免对数据帧的干扰。
实施例十七
本申请实施例公开的又一种数据传输控制方法，如图9所示，包括以下步骤：
S901：HEW-AP侦听信道；
S902：HEW-AP侦听到一个空闲信道后，如果接入点的缓冲器buffer的长度或者站点上报的buffer的长度大于预设阈值，则通过此空闲信道，发送第二类型第一控制帧；
本实施例中，第二类型第一控制帧基于MAC层协议的帧结构如图10所示，包括：
帧控制Frame Control字段(占用16比特)，此字段的结构及功能与图5所示相同，这里不再赘述。
第一Duration字段(占用16比特)。与图5不同的是，本实施例中，第一Duration字段的值为：估计的后续数据传输的时长+3倍短帧间间隔SIFS时长+数据触发帧的时长。Legacy-STA和未参与数据传输(未被调 度)的HEW-STA可以根据此值更新NAV，参与数据传输的HEW-STA将根据此值确定被传输的数据的大小。
接收端地址RA字段(占用48比特)，与图5不同的是，本实施例中，表示处于所述BSS内的第一预设整数的站点的标识。
发送端地址TA字段(占用48比特)，与图5不同的是，本实施例中，表示处于所述BSS内的第一预设整数的站点的标识，如图10所示，RA和TA中分别包括4个STA的部分关联标识(Partial Association Identification，PAID)，限于TA和RA所占的字节数，所以，第一整数和第二整数均为4(8个标识的编号依次可以为1-8)。
FCS字段(占用32比特)的功能与图5所示的帧结构相同。
第二类型第一控制帧基于物理层协议的帧格式如图6所示。
也就是说，本实施例中，不仅以BSS color为指向，而且指示了允许参与数据传输的HEW-STA的标识，更具有针对性。
S903：HEW-STA依据Frame Control字段识别出第二类型第一控制帧后，确认是否处于所述BSS color指示的BSS内且PAID是否包含在第二类型第一控制帧中，如果是，执行S904，如果否，执行S905或S906；
S904：HEW-STA向HEW-AP回复第二控制帧；
本实施例中，第二控制帧的帧结构可以参见图7和图8所示，这里不再赘述。
S905：如果不在此BSS内且对此BSS内的数据传输造成干扰，HEW-STA依据第二类型第一控制帧中的第一Duration字段的值，和/或第二控制帧中的第二字段的值(本实施例中两者不同)，来更新NAV；
S906：如果在此BSS内，但其PAID未携带在第二类型第一控制帧中，HEW-STA依据第二类型第一控制帧中的第一Duration字段的值，和/或第二控制帧中的第二字段的值(本实施例中两者不同)，来更新NAV；
S907(图中未画出)：Legacy-STA不能够识别第二类型第一控制帧，依据第一Duration字段的值，和/或第二字段的值(本实施例中两者不同)，来更新NAV。
具体地，在第一控制帧中的第一Duration字段的值和第二控制帧中的 第二字段的值不同的情况下，可以依据先接收到的帧中的Duration字段值更新NAV，再依据后接收到的帧中的Duration字段值更新NAV。
本实施例中，虽然HEW-AP不知道是哪个HEW-STA回复的第二控制帧,HEW-AP可以与已回复第二控制帧的HEW-STA进行数据传输，数据传输的具体过程可以参见上述实施例，这里不再赘述。
本实施例中所述的方法，HEW-AP除了指定BSS之外，还指定具体的HEW-STA，从而更具有针对性。
需要说明的是，因为STA可以在HEW模式和Legacy模式之间进行转换，所以，如果HEW-AP指定的STA当前处于Legacy模式，则其无法识别第二类型第一控制帧，从而不回复第二控制帧，HEW-AP可以与回复第二控制帧的HEW-STA进行通信，而Legacy-STA在此通信过程中保持静默。
实施例十八
本申请实施例公开的又一种数据传输控制方法，如图11所示，包括以下步骤：
S1101：HEW-AP侦听信道；
S1102：如果HEW-AP侦听到多个空闲信道，则HEW-AP在每一个空闲信道上均发送第二类型第一控制帧；
如图12所示，HEW-AP竞争到多个20MHZ的空闲信道，在每个空闲信道上均发送相同的第二类型第一控制帧。
本实施例中，第二类型第一控制帧的帧结构如图10和图6所示，这里不再赘述。
S1103：HEW-STA依据Frame Control字段识别出第二类型第一控制帧后，确认是否处于所述BSS color指示的BSS内且PAID是否包含在第二类型第一控制帧中，如果是，执行S1104，如果否，执行S1105或S1106；
S1104：HEW-STA向HEW-AP回复第二控制帧，同样地，HEW-STA也可以通过多个空闲信道发送第二控制帧；
本实施例中，第二控制帧基于MAC层协议的帧结构如图7所示，这 里不再赘述。与上述实施例不同的是，图7所示的第二控制帧基于物理层的帧结构如图13所示，包括：
图13所示的结构以及OFDMA符号，两者之间包括一个预设时长(To Be Defined，TBD)，TBD小于或等于SIFS时长。其中，OFDMA符号中包括N个资源单元RU，与当前站点对应的RU中携带此站点的标识，每个RU对应不同的站点，N为第三预设整数，与图10所述的第二类型第一控制帧结构中站点的标识相对应地，第三预设整数可以等于或大于第一预设整数与第二预设整数之和，例如N＝9，在此情况下，如图13所示，中间的RU可以空闲不用。站点标识的顺序可以与图10所述的第二类型第一控制帧结构中站点的标识的方式顺序一致。
S1105：如果不在本BSS内且对本BSS内的数据传输造成干扰，HEW-STA依据第二类型第一控制帧中的第一Duration字段的值，和/或第二控制帧中的第二字段的值(本实施例中两者不同)，来更新NAV；
S1106：如果在本BSS内但其标识未携带在第二类型第一控制帧中，HEW-STA依据第二类型第一控制帧中的第一Duration字段的值，和/或第二控制帧中的第二字段的值(本实施例中两者不同)，来更新NAV；
S1107(图中未画出)：Legacy-STA不能够识别第一控制帧，依据第一Duration字段的值，和/或第二字段的值(本实施例中两者不同)，来更新NAV。
本实施例中，HEW-STA在回复的第二控制帧中告知标识，从而使得HEW-AP能够知道是哪个HEW-STA回复的第二控制帧。
实施例十九
本申请实施例公开的又一种数据传输控制方法，如图14所示，包括以下步骤：
S1401：HEW-STA1侦听信道；
S1402：如果发现空闲(多个)信道，HEW-STA通过(多个)信道向HEW-AP发送第一控制帧；
本实施例中，HEW-STA1发送第一控制帧的目的在于告知HEW-AP 存在空闲的信道，第一控制帧中携带此HEW-STA1的BSS color，可以为第一类型第一控制帧和第二类型第一控制帧中的任意一种。
S1403：HEW-AP发送第二类型第一控制帧；
所述第二类型第一控制帧如图10所示，其中的BSS color为上一步中接收到的第一控制帧中携带的BSS color。需要说明的是，第二类型第一控制帧可以携带HEW-STA1的PAID，也可以不携带此PAID，如果不携带此PAID，则可以通过其它数据帧与HEW-STA1进行数据传输的控制过程。
S1404：其它HEW-STA(第二类型第一控制帧中指示的)回复第二控制帧，第二控制帧可以参见图7所示和图8所示；
S1405：没有被指定参与数据传输的HEW-STA和Legacy-STA更新NAV。
本实施例中，HEW-STA和HEW-AP也可以利用多个空闲信道传输数据帧。
本实施例中，由HEW-STA竞争信道并将数据传输的调度控制权交给HEW-AP，同样可以在规避干扰的前提下提高带宽利用率。
实施例二十
与上述方法实施例相对应地，本申请实施例还公开了一种接入点，如图16所示，包括：
第一发送模块1601，用于发送第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识，所述第一Duration字段的值用于表示所述接入点与所述基本服务集内的站点之间进行数据传输所需的保护时长；
数据传输模块1602，用于如果站点反馈的第二控制帧携带的基本服务集的标识与所述第一控制帧携带的所述基本服务集的标识相同，与所述站点间进行数据传输。
本实施例中，第一控制帧的具体帧结构可以参见上述方法实施例所述，这里不再赘述。
具体地，第一发送模块发送第一控制帧的具体实现方式可以为：在确 认信道空闲后，或者在确认存在至少两个空闲信道的情况下，向所述至少两个空闲信道均发送第一控制帧；或者，如果所述接入点的缓冲器buffer的长度或者所述站点上报的buffer的长度大于预设阈值，则发送所述第一控制帧。
第一发送模块确认信道空闲的具体实现方式可以为：侦听到空闲信道；或者，接收站点发送的第一控制帧，所述第一控制帧中携带所述站点所处的基本服务集的标识。
本实施例中所述的接入点，基于发送的第一控制帧，能够使得在同一时间段内多个站点同时接入，从而提高带宽利用率。
实施例二十一
本申请实施例还公开了一种站点，如图17所示，包括：
第一接收模块1701，用于接收接入点发送的第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识；
第一处理模块1702，用于如果所述站点处于所述基本服务集内，则向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；如果所述站点未处于所述基本服务集内且对所述基本服务集内的数据传输造成干扰，则至少依据所述第一Duration字段的值，更新NAV。
可选地，还可以包括：
第二发送模块1703，用于在接收接入点发送的第一控制帧之前，侦听到空闲信道；向所述接入点发送所述第一控制帧，所述第一控制帧中携带所述站点所处的基本服务集的标识，所述第一控制帧用于告知所述接入点存在空闲的信道。
本实施例中所述的第二控制帧的帧结构可以参见上述方法实施例所述，这里不再赘述。
具体地，第一处理模块确定所述站点对所述基本服务集内的数据传输造成干扰的具体实现方式可以为：确定所述站点的接收功率大于空闲信道评估CCA阈值或者重叠的基本服务集OBSS的CCA阈值。
具体地，第一处理模块向所述接入点回复第二控制帧的具体实现方式 可以为：利用至少两个空闲信道向所述接入点发送第一控制帧。
本实施例中所述的站点，用于在接收到接入点发送的携带有BSS的标识的情况下，反馈第二控制帧或者更新NAV，实现在不干扰数据传输的前提下，提高带宽利用率的目的。
实施例二十二
本申请实施例公开的又一种站点，如图18所示，包括：
第二接收模块1801，用于接收接入点发送的第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识以及处于所述基本服务集内的站点的标识；
第二处理模块1802，用于如果所述站点处于所述基本服务集内且所述站点的标识携带在所述第一控制帧中，则向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；如果所述站点处于所述基本服务集内但其标识未携带在所述第一控制帧中，则至少依据所述第一Duration字段的值，更新NAV；如果所述站点未处于所述基本服务集内且对所述基本服务集内的数据传输造成干扰，则至少依据所述第一Duration字段的值，更新NAV。
第三发送模块1803，用于在接收接入点发送的第一控制帧之前，侦听到空闲信道；向所述接入点发送所述第一控制帧，所述第一控制帧中携带所述站点所处的基本服务集的标识，所述第一控制帧用于告知所述接入点存在空闲的信道。
本实施例中，第二控制帧的帧结构可以参见上述方法实施例所述，这里不再赘述。
具体地，第二处理模块确定所述站点对所述基本服务集内的数据传输造成干扰的具体实现方式可以为：确定所述站点的接收功率大于空闲信道评估CCA阈值或者重叠的基本服务集OBSS的CCA阈值。
具体地，第二处理模块向所述接入点回复第二控制帧的具体实现方式可以为：利用至少两个空闲信道向所述接入点发送第一控制帧。
本实施例中所述的站点，用于在接收到接入点发送的携带有BSS的标 识以及允许进行数据传输的站点的标识的情况下，反馈第二控制帧或者更新NAV，实现在不干扰数据传输的前提下，提高带宽利用率的目的。
实施例二十三
本申请实施例公开的又一种接入点，包括：
发送器，用于发送第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识，所述第一Duration字段的值用于表示所述接入点与所述基本服务集内的站点之间进行数据传输所需的保护时长；
处理器，用于如果站点反馈的第二控制帧携带的基本服务集的标识与所述第一控制帧携带的所述基本服务集的标识相同，与所述站点间进行数据传输。
存储器，用于存储处理器中的程序，以及程序运行过程中产生的数据。
其中，发送器、处理器和存储器可以通过总线进行通信。
本实施例所述的接入点的具体功能实现可以参见上述方法实施例，这里不再赘述。
实施例二十四
本申请实施例公开的又一种站点，包括：
接收器，用于接收接入点发送的第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识；
处理器，用于如果所述站点处于所述基本服务集内，则向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；如果所述站点未处于所述基本服务集内且对所述基本服务集内的数据传输造成干扰，则至少依据所述第一Duration字段的值，更新NAV。
存储器，用于存储处理器中的程序，以及程序运行过程中产生的数据。
其中，接收器、处理器和存储器可以通过总线进行通信。
本实施例所述的站点的具体功能实现可以参见上述方法实施例，这里不再赘述。
实施例二十五
本申请实施例公开的又一种站点，包括：
接收器，用于接收接入点发送的第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识以及处于所述基本服务集内的站点的标识；
处理器，用于如果所述站点处于所述基本服务集内且所述站点的标识携带在所述第一控制帧中，则向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；如果所述站点处于所述基本服务集内但其标识未携带在所述第一控制帧中，则至少依据所述第一Duration字段的值，更新NAV；如果所述站点未处于所述基本服务集内且对所述基本服务集内的数据传输造成干扰，则至少依据所述第一Duration字段的值，更新NAV。
存储器，用于存储处理器中的程序，以及程序运行过程中产生的数据。
其中，接收器、处理器和存储器可以通过总线进行通信。
本实施例所述的站点的具体功能实现可以参见上述方法实施例，这里不再赘述。
本实施例方法所述的功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算设备可读取存储介质中。基于这样的理解，本发明实施例对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该软件产品存储在一个存储介质中，包括若干指令用以使得一台计算设备(可以是个人计算机，服务器，移动计算设备或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其它实施例的不同之处，各个实施例之间相同或相似部分互相参见即可。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使 用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (58)

  1. 一种数据传输控制方法，其特征在于，包括：
    接入点发送第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识，所述第一Duration字段的值用于表示所述接入点与所述基本服务集内的站点之间进行数据传输所需的保护时长；
    如果站点反馈的第二控制帧携带的基本服务集的标识与所述第一控制帧携带的所述基本服务集的标识相同，所述接入点与所述站点间进行数据传输。
  2. 根据权利要求1所述的方法，其特征在于，所述第一控制帧包括：第一类型第一控制帧，所述第一类型第一控制帧基于MAC层协议的帧格式中包括：
    第一Duration字段、位于所述第一Duration字段之前的帧控制Frame Control字段、位于所述第一Duration字段之后的接收端地址RA字段、位于所述RA字段之后的发送端地址TA字段，以及位于所述TA字段之后的帧校验序列FCS；
    其中，所述Frame Control字段中包括协议版本protocol version字段、位于所述protocol version字段之后的类型Type字段、位于所述Type字段之后的子类型Subtype value字段以及位于所述Subtype value字段之后的所述基本服务集的标识BSS color字段，所述RA字段用于表示预定数值，所述TA字段用于表示所述接入点的媒体接入控制MAC地址，所述FCS用于对所述接入点的MAC地址进行CRC校验。
  3. 根据权利要求2所述的方法，其特征在于，所述第一类型第一控制帧的中的第一Duration字段的值为：
    估计的后续数据传输的时长+2倍短帧间间隔SIFS时长+所述第一类型第一控制帧的时长。
  4. 根据权利要求1所述的方法，其特征在于，所述第一控制帧包括：第二类型第一控制帧，所述第二类型第一控制帧基于MAC层协议的帧格式中包括：
    第一Duration字段、位于所述第一Duration字段之前的帧控制Frame  Control字段、位于所述第一Duration字段之后的接收端地址RA字段、位于所述RA字段之后的发送端地址TA字段，以及位于所述TA字段之后的帧校验序列FCS；
    其中，所述Frame Control字段中包括协议版本protocol version字段、位于所述protocol version字段之后的类型Type字段、位于所述Type字段之后的子类型Subtype value字段以及位于所述Subtype value字段之后的基本服务集的标识BSS color字段，所述RA字段用于表示处于所述基本服务集内的第一预设整数的站点的标识、所述TA字段用于表示处于所述基本服务集内的第二预设整数的站点的标识，所述FCS用于对所述接入点的MAC地址进行CRC校验。
  5. 根据权利要求4所述的方法，其特征在于，所述第二类型第一控制帧中的第一Duration字段的值为：
    估计的后续数据传输的时长+3倍短帧间间隔SIFS时长+所述第二控制帧的时长+数据触发帧的时长。
  6. 根据权利要求1至5任一项所述的方法，其特征在于，所述接入点发送第一控制帧包括：
    接入点在确认信道空闲后，发送第一控制帧；
    或者，接入点在确认存在至少两个空闲信道的情况下，向所述至少两个空闲信道均发送第一控制帧。
  7. 根据权利要求6所述的方法，其特征在于，所述接入点确认信道空闲的方法包括：
    所述接入点侦听到空闲信道；或者，所述接入点接收站点发送的第一控制帧，所述第一控制帧中携带所述站点所处的基本服务集的标识。
  8. 根据权利要求1至7任一项所述的方法，其特征在于，所述发送第一控制帧包括：
    如果所述接入点的缓冲器buffer的长度或者所述站点上报的buffer的长度大于预设阈值，则发送所述第一控制帧。
  9. 一种数据传输控制方法，其特征在于，包括：
    站点接收接入点发送的第一控制帧，所述第一控制帧包括第一 Duration字段并携带基本服务集的标识；
    如果所述站点处于所述基本服务集内，则所述站点向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；
    如果所述站点未处于所述基本服务集内且对所述基本服务集内的数据传输造成干扰，则所述站点至少依据所述第一Duration字段的值，更新NAV。
  10. 根据权利要求9所述的方法，其特征在于，所述第二控制帧携带所述基本服务集的标识包括：
    所述第二控制帧基于MAC层协议的帧格式携带所述基本服务集的标识；
    所述第二控制帧基于MAC层协议的帧格式中还包括：
    第二Duration字段，所述第二Duration字段的值用于表示所述接入点与参与所述基本服务集内的站点之间进行数据传输所需的保护时长。
  11. 根据权利要求10所述的方法，其特征在于，所述第二控制帧基于MAC层协议的帧结构中还包括：
    位于所述第二Duration字段之前的帧控制Frame Control字段、位于所述第二Duration字段之后的RA字段，以及位于所述RA字段之后的FCS字段；
    其中，所述Frame Control字段中包括协议版本protocol version字段、位于所述protocol version字段之后的类型Type字段、位于所述Type字段之后的子类型Subtype value字段以及位于所述Subtype value字段之后的所述基本服务集的标识BSS color字段，所述RA字段用于表示预定数值，所述FCS字段用于对所述接入点的MAC地址进行CRC校验。
  12. 根据权利要求10所述的方法，其特征在于，所述第二控制帧基于MAC层协议的帧结构中还包括：
    位于所述第二Duration字段之前的帧控制Frame Control字段、位于所述第二Duration字段之后、BSS color字段之前的RA字段，以及位于所述BSS color字段之后的FCS字段。
  13. 根据权利要求9至12任一项所述的方法，其特征在于，所述第二 控制帧基于物理层协议的帧结构包括：
    L-STF字段、L-LTF字段、L-SIG字段以及数据data字段。
  14. 根据权利要求13所述的方法，其特征在于，所述第二控制帧基于物理层协议的帧结构中还包括：
    位于所述L-STF字段之前的OFDMA符号，所述OFDMA符号中包括N个资源单元RU，与所述站点对应的RU中携带所述站点的标识，每个RU对应不同的站点，N为第三预设整数；
    所述OFDMA符号与所述L-STF字段之间预设时长TBD，所述TBD小于或等于SIFS时长。
  15. 根据权利要求10至14任一项所述的方法，其特征在于，所述第二Duration字段的值为：
    估计的后续数据传输的时长+2倍短帧间间隔SIFS时长+数据触发帧的时长。
  16. 根据权利要求9至15任一项所述的方法，其特征在于，所述对所述基本服务集内的数据传输造成干扰包括：
    所述站点的接收功率大于空闲信道评估CCA阈值或者重叠的基本服务集OBSS的CCA阈值。
  17. 根据权利要求9至16任一项所述的方法，其特征在于，所述站点向所述接入点回复第二控制帧包括：
    所述站点利用至少两个空闲信道向所述接入点发送第一控制帧。
  18. 根据权利要求9至17任一项所述的方法，其特征在于，在所述站点接收接入点发送的第一控制帧之前，还包括：
    所述站点侦听到空闲信道；
    所述站点向所述接入点发送所述第一控制帧，所述第一控制帧中携带所述站点所处的基本服务集的标识，所述第一控制帧用于告知所述接入点存在空闲的信道。
  19. 一种数据传输控制方法，其特征在于，包括：
    站点接收接入点发送的第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识以及所述基本服务集内的站点的标 识；
    如果所述站点处于所述基本服务集内且所述站点的标识携带在所述第一控制帧中，则所述站点向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；
    如果所述站点处于所述基本服务集内但所述站点的标识未携带在所述第一控制帧中，则所述站点至少依据所述第一Duration字段的值，更新NAV。
  20. 根据权利要求19所述的方法，其特征在于，还包括：
    如果所述站点未处于所述基本服务集内且对所述基本服务集内的数据传输造成干扰，则所述站点至少依据所述第一Duration字段的值，更新NAV。
  21. 根据权利要求19或20所述的方法，其特征在于，所述第二控制帧携带所述基本服务集的标识包括：
    所述第二控制帧基于MAC层协议的帧格式中携带所述基本服务集的标识；
    所述第二控制帧基于MAC层协议的帧格式中还包括：
    第二Duration字段，所述第二Duration字段的值用于表示所述接入点与参与所述基本服务集内的站点之间进行数据传输所需的保护时长。
  22. 根据权利要求21所述的方法，其特征在于，所述第二控制帧基于MAC层协议的帧结构中还包括：
    位于所述第二Duration字段之前的帧控制Frame Control字段、位于所述第二Duration字段之后的RA字段，以及位于所述RA字段之后的FCS字段；
    其中，所述Frame Control字段中包括协议版本protocol version字段、位于所述protocol version字段之后的类型Type字段、位于所述Type字段之后的子类型Subtype value字段以及位于所述Subtype value字段之后的所述基本服务集的标识BSS color字段，所述RA字段用于表示预定数值，所述FCS字段用于对所述接入点的MAC地址进行CRC校验。
  23. 根据权利要求21所述的方法，其特征在于，所述第二控制帧基于 MAC层协议的帧结构中还包括：
    位于所述第二Duration字段之前的帧控制Frame Control字段、位于所述第二Duration字段之后、BSS color字段之前的RA字段，以及位于所述BSS color字段之后的FCS字段。
  24. 根据权利要求19至23任一项所述的方法，其特征在于，所述第二控制帧基于物理层协议的帧结构包括：
    L-STF字段、L-LTF字段、L-SIG字段以及数据data字段。
  25. 根据权利要求24所述的方法，其特征在于，所述第二控制帧基于物理层协议的帧结构中还包括：
    位于所述L-STF字段之前的OFDMA符号，所述OFDMA符号中包括N个资源单元RU，与所述站点对应的RU中携带所述站点的标识，每个RU对应不同的站点，N为第三预设整数；
    所述OFDMA符号与所述L-STF字段之间预设时长TBD，所述TBD小于或等于SIFS时长。
  26. 根据权利要求21至25任一项所述的方法，其特征在于，所述第二Duration字段的值为：
    估计的后续数据传输的时长+2倍短帧间间隔SIFS时长+数据触发帧的时长。
  27. 根据权利要求19至26任一项所述的方法，其特征在于，所述对所述基本服务集内的数据传输造成干扰包括：
    所述站点的接收功率大于空闲信道评估CCA阈值或者重叠的基本服务集OBSS的CCA阈值。
  28. 根据权利要求19至27任一项所述的方法，其特征在于，所述站点向所述接入点回复第二控制帧包括：
    所述站点利用至少两个空闲信道向所述接入点发送第一控制帧。
  29. 根据权利要求19至28任一项所述的方法，其特征在于，在所述站点接收接入点发送的第一控制帧之前，还包括：
    所述站点侦听到空闲信道；
    所述站点向所述接入点发送所述第一控制帧，所述第一控制帧中携带 所述站点所处的基本服务集的标识，所述第一控制帧用于告知所述接入点存在空闲的信道。
  30. 一种接入点，其特征在于，包括：
    第一发送模块，用于发送第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识，所述第一Duration字段的值用于表示所述接入点与所述基本服务集内的站点之间进行数据传输所需的保护时长；
    数据传输模块，用于如果站点反馈的第二控制帧携带的基本服务集的标识与所述第一控制帧携带的所述基本服务集的标识相同，与所述站点间进行数据传输。
  31. 根据权利要求30所述的接入点，其特征在于，所述第一发送模块用于发送第一控制帧，包括：
    所述第一发送模块具体用于，发送第一类型第一控制帧，所述第一类型第一控制帧基于MAC层协议的帧格式中包括：
    第一Duration字段、位于所述第一Duration字段之前的帧控制Frame Control字段、位于所述第一Duration字段之后的接收端地址RA字段、位于所述RA字段之后的发送端地址TA字段，以及位于所述TA字段之后的帧校验序列FCS；
    其中，所述Frame Control字段中包括协议版本protocol version字段、位于所述protocol version字段之后的类型Type字段、位于所述Type字段之后的子类型Subtype value字段以及位于所述Subtype value字段之后的所述基本服务集的标识BSS color字段，所述RA字段用于表示预定数值，所述TA字段用于表示所述接入点的媒体接入控制MAC地址，所述FCS用于对所述接入点的MAC地址进行CRC校验。
  32. 根据权利要求31所述的接入点，其特征在于，所述第一发送模块具体用于发送第一类型第一控制帧包括：
    所述第一发送模块具体用于，发送第一类型第一控制帧，所述第一类型第一控制帧的中的第一Duration字段的值为：估计的后续数据传输的时长+2倍短帧间间隔SIFS时长+所述第一类型第一控制帧的时长。
  33. 根据权利要求30所述的接入点，其特征在于，所述第一发送模块用于发送第一控制帧，包括：
    所述第一发送模块具体用于，发送第二类型第一控制帧，所述第二类型第一控制帧中包括：
    第一Duration字段、位于所述第一Duration字段之前的帧控制Frame Control字段、位于所述第一Duration字段之后的接收端地址RA字段、位于所述RA字段之后的发送端地址TA字段，以及位于所述TA字段之后的帧校验序列FCS；
    其中，所述Frame Control字段中包括协议版本protocol version字段、位于所述protocol version字段之后的类型Type字段、位于所述Type字段之后的子类型Subtype value字段以及位于所述Subtype value字段之后的基本服务集的标识BSS color字段，所述RA字段用于表示处于所述基本服务集内的第一预设整数的站点的标识、所述TA字段用于表示处于所述基本服务集内的第二预设整数的站点的标识，所述FCS用于对所述接入点的MAC地址进行CRC校验。
  34. 根据权利要求33所述的接入点，其特征在于，所述第一发送模块具体用于发送第二类型第一控制帧包括：
    所述第一发送模块具体用于，发送第二类型第一控制帧，所述第二类型第一控制帧中的第一Duration字段的值为：估计的后续数据传输的时长+3倍短帧间间隔SIFS时长+所述第二控制帧的时长+数据触发帧的时长。
  35. 根据权利要求30至34任一项所述的接入点，其特征在于，所述第一发送模块用于发送第一控制帧包括：
    所述第一发送模块具体用于，在确认信道空闲后，发送第一控制帧；或者，在确认存在至少两个空闲信道的情况下，向所述至少两个空闲信道均发送第一控制帧。
  36. 根据权利要求35所述的接入点，其特征在于，所述第一发送模块用于确认信道空闲包括：
    所述第一发送模块具体用于，侦听到空闲信道；或者，接收站点发送的第一控制帧，所述第一控制帧中携带所述站点所处的基本服务集的标识。
  37. 根据权利要求30至36任一项所述的接入点，其特征在于，所述第一发送模块用于发送第一控制帧包括：
    所述第一发送模块具体用于，如果所述接入点的缓冲器buffer的长度或者所述站点上报的buffer的长度大于预设阈值，则发送所述第一控制帧。
  38. 一种站点，其特征在于，包括：
    第一接收模块，用于接收接入点发送的第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识；
    第一处理模块，用于如果所述站点处于所述基本服务集内，则向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；如果所述站点未处于所述基本服务集内且对所述基本服务集内的数据传输造成干扰，则至少依据所述第一Duration字段的值，更新NAV。
  39. 根据权利要求38所述的站点，其特征在于，所述第一处理模块用于向所述接入点回复第二控制帧包括：
    所述第一处理模块具体用于，向所述接入点回复第二控制帧，所述第二控制帧基于MAC层协议的帧格式携带所述基本服务集的标识；
    所述第二控制帧基于MAC层协议的帧格式中还包括：
    第二Duration字段，所述第二Duration字段的值用于表示所述接入点与参与所述基本服务集内的站点之间进行数据传输所需的保护时长。
  40. 根据权利要求39所述的站点，其特征在于，所述第一处理模块用于向所述接入点回复第二控制帧包括：
    所述第一处理模块具体用于，向所述接入点回复第二控制帧，所述第二控制帧基于MAC层协议的帧结构中还包括：
    位于所述第二Duration字段之前的帧控制Frame Control字段、位于所述第二Duration字段之后的RA字段，以及位于所述RA字段之后的FCS字段；
    其中，所述Frame Control字段中包括协议版本protocol version字段、位于所述protocol version字段之后的类型Type字段、位于所述Type字段之后的子类型Subtype value字段以及位于所述Subtype value字段之后的所述基本服务集的标识BSS color字段，所述RA字段用于表示预定数值，所 述FCS字段用于对所述接入点的MAC地址进行CRC校验。
  41. 根据权利要求39所述的站点，其特征在于，所述第一处理模块用于向所述接入点回复第二控制帧包括：
    所述第一处理模块具体用于，向所述接入点回复第二控制帧，所述第二控制帧基于MAC层协议的帧结构中还包括：
    位于所述第二Duration字段之前的帧控制Frame Control字段、位于所述第二Duration字段之后、BSS color字段之前的RA字段，以及位于所述BSS color字段之后的FCS字段。
  42. 根据权利要求38至41任一项所述的站点，其特征在于，所述第一处理模块用于向所述接入点回复第二控制帧包括：
    所述第一处理模块具体用于，向所述接入点回复第二控制帧，所述第二控制帧基于物理层协议的帧结构包括：
    L-STF字段、L-LTF字段、L-SIG字段以及数据data字段。
  43. 根据权利要求42所述的站点，其特征在于，所述第一处理模块用于向所述接入点回复第二控制帧包括：
    所述第一处理模块具体用于，向所述接入点回复第二控制帧，所述第二控制帧基于物理层协议的帧结构中还包括：
    位于所述L-STF字段之前的OFDMA符号，所述OFDMA符号中包括N个资源单元RU，与所述站点对应的RU中携带所述站点的标识，每个RU对应不同的站点，N为第三预设整数；
    所述OFDMA符号与所述L-STF字段之间预设时长TBD，所述TBD小于或等于SIFS时长。
  44. 根据权利要求39至43任一项所述的站点，其特征在于，所述第一处理模块用于向所述接入点回复第二控制帧包括：
    所述第一处理模块具体用于，向所述接入点回复第二控制帧，所述第二控制帧基于MAC层协议的帧格式中还包括：第二Duration字段，所述第二Duration字段的值为：估计的后续数据传输的时长+2倍短帧间间隔SIFS时长+数据触发帧的时长。
  45. 根据权利要求38至44任一项所述的站点，其特征在于，所述第 一处理模块用于确定所述站点对所述基本服务集内的数据传输造成干扰包括：
    所述第一处理模块具体用于，确定所述站点的接收功率大于空闲信道评估CCA阈值或者重叠的基本服务集OBSS的CCA阈值。
  46. 根据权利要求38至45任一项所述的站点，其特征在于，所述第一处理模块向所述接入点回复第二控制帧包括：
    所述第一处理模块具体用于，利用至少两个空闲信道向所述接入点发送第一控制帧。
  47. 根据权利要求38至46任一项所述的站点，其特征在于，还包括：
    第二发送模块，用于在接收接入点发送的第一控制帧之前，侦听到空闲信道；向所述接入点发送所述第一控制帧，所述第一控制帧中携带所述站点所处的基本服务集的标识，所述第一控制帧用于告知所述接入点存在空闲的信道。
  48. 一种站点，其特征在于，包括：
    第二接收模块，用于接收接入点发送的第一控制帧，所述第一控制帧包括第一Duration字段并携带基本服务集的标识以及处于所述基本服务集内的站点的标识；
    第二处理模块，用于如果所述站点处于所述基本服务集内且所述站点的标识携带在所述第一控制帧中，则向所述接入点回复第二控制帧，所述第二控制帧携带所述基本服务集的标识；如果所述站点处于所述基本服务集内但所述站点的标识未携带在所述第一控制帧中，则至少依据所述第一Duration字段的值，更新NAV。
  49. 根据权利要求48所述的站点，其特征在于，所述第二处理模块还用于：
    如果所述站点未处于所述基本服务集内且对所述基本服务集内的数据传输造成干扰，则至少依据所述第一Duration字段的值，更新NAV。
  50. 根据权利要求48或49所述的站点，其特征在于，所述第二处理模块用于向所述接入点回复第二控制帧包括：
    所述第二处理模块具体用于，向所述接入点回复第二控制帧，所述第 二控制帧基于MAC层协议的帧格式中携带所述基本服务集的标识；
    所述第二控制帧基于MAC层协议的帧格式中还包括：第二Duration字段，所述第二Duration字段的值用于表示所述接入点与参与所述基本服务集内的站点之间进行数据传输所需的保护时长。
  51. 根据权利要求50所述的站点，其特征在于，所述第二处理模块用于向所述接入点回复第二控制帧包括：
    所述第二处理模块具体用于，向所述接入点回复第二控制帧，所述第二控制帧基于MAC层协议的帧结构中还包括：
    位于所述第二Duration字段之前的帧控制Frame Control字段、位于所述第二Duration字段之后的RA字段，以及位于所述RA字段之后的FCS字段；
    其中，所述Frame Control字段中包括协议版本protocol version字段、位于所述protocol version字段之后的类型Type字段、位于所述Type字段之后的子类型Subtype value字段以及位于所述Subtype value字段之后的所述基本服务集的标识BSS color字段，所述RA字段用于表示预定数值，所述FCS字段用于对所述接入点的MAC地址进行CRC校验。
  52. 根据权利要求50所述的站点，其特征在于，所述第二处理模块用于向所述接入点回复第二控制帧包括：
    所述第二处理模块具体用于，向所述接入点回复第二控制帧，所述第二控制帧基于MAC层协议的帧结构中还包括：
    位于所述第二Duration字段之前的帧控制Frame Control字段、位于所述第二Duration字段之后、BSS color字段之前的RA字段，以及位于所述BSS color字段之后的FCS字段。
  53. 根据权利要求48至52任一项所述的站点，其特征在于，所述第二处理模块用于向所述接入点回复第二控制帧包括：
    所述第二处理模块具体用于，向所述接入点回复第二控制帧，所述第二控制帧基于物理层协议的帧结构包括：
    L-STF字段、L-LTF字段、L-SIG字段以及数据data字段。
  54. 根据权利要求53所述的站点，其特征在于，所述第二处理模块用 于向所述接入点回复第二控制帧包括：
    所述第二处理模块具体用于，向所述接入点回复第二控制帧，所述第二控制帧基于物理层协议的帧结构中还包括：
    位于所述L-STF字段之前的OFDMA符号，所述OFDMA符号中包括N个资源单元RU，与所述站点对应的RU中携带所述站点的标识，每个RU对应不同的站点，N为第三预设整数；
    所述OFDMA符号与所述L-STF字段之间预设时长TBD，所述TBD小于或等于SIFS时长。
  55. 根据权利要求50至54任一项所述的站点，其特征在于，所述第二处理模块用于向所述接入点回复第二控制帧包括：
    所述第二处理模块具体用于，向所述接入点回复第二控制帧，所述第二控制帧基于MAC层协议的帧格式中还包括：第二Duration字段，所述第二Duration字段的值为：
    估计的后续数据传输的时长+2倍短帧间间隔SIFS时长+数据触发帧的时长。
  56. 根据权利要求48至55任一项所述的站点，其特征在于，所述第二处理模块用于确定所述站点对所述基本服务集内的数据传输造成干扰包括：
    所述第二处理模块具体用于，确定所述站点的接收功率大于空闲信道评估CCA阈值或者重叠的基本服务集OBSS的CCA阈值。
  57. 根据权利要求48至56任一项所述的站点，其特征在于，所述第二处理模块向所述接入点回复第二控制帧包括：
    所述第二处理模块具体用于，利用至少两个空闲信道向所述接入点发送第一控制帧。
  58. 根据权利要求48至57任一项所述的站点，其特征在于，还包括：
    第三发送模块，用于在接收接入点发送的第一控制帧之前，侦听到空闲信道；向所述接入点发送所述第一控制帧，所述第一控制帧中携带所述站点所处的基本服务集的标识，所述第一控制帧用于告知所述接入点存在空闲的信道。
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