WO2016045036A1 - 一种数据通信方法及相关装置 - Google Patents

一种数据通信方法及相关装置 Download PDF

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Publication number
WO2016045036A1
WO2016045036A1 PCT/CN2014/087403 CN2014087403W WO2016045036A1 WO 2016045036 A1 WO2016045036 A1 WO 2016045036A1 CN 2014087403 W CN2014087403 W CN 2014087403W WO 2016045036 A1 WO2016045036 A1 WO 2016045036A1
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WIPO (PCT)
Prior art keywords
access device
length
data
standard protocol
beacon frame
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Ceased
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PCT/CN2014/087403
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English (en)
French (fr)
Inventor
王宁娟
薛鑫
颜敏
于健
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP18199812.1A priority Critical patent/EP3512109B1/en
Priority to ES19169451T priority patent/ES2936459T3/es
Priority to ES14902301T priority patent/ES2720752T3/es
Priority to CN202010960040.6A priority patent/CN112153026B/zh
Priority to EP14902301.2A priority patent/EP3190716B1/en
Priority to KR1020197003556A priority patent/KR102024110B1/ko
Priority to CN201480081979.8A priority patent/CN107078764B/zh
Priority to KR1020177010881A priority patent/KR20170057419A/ko
Priority to EP19169451.2A priority patent/EP3591855B1/en
Priority to EP20217572.5A priority patent/EP3863187B1/en
Priority to JP2017516288A priority patent/JP2017532884A/ja
Priority to PCT/CN2014/087403 priority patent/WO2016045036A1/zh
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2016045036A1 publication Critical patent/WO2016045036A1/zh
Priority to US15/468,593 priority patent/US10833828B2/en
Anticipated expiration legal-status Critical
Priority to US16/390,333 priority patent/US10873436B2/en
Priority to US17/124,710 priority patent/US11569962B2/en
Priority to US18/152,351 priority patent/US12615119B2/en
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/005—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by adjustment in the receiver
    • 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 invention relates to the field of data communication technologies, and in particular, to a data communication method and related apparatus.
  • GI Guard Interval
  • 802.11n and 802.11ac are mainstream standards of WLAN (for example, 802.11n and 802.11ac) to eliminate inter-symbol interference caused by delay spread of a channel.
  • the terminal In the process of the terminal communicating with the access device, the terminal needs to select an appropriate guard interval length in order to eliminate inter-symbol interference to the greatest extent.
  • the GI used In the 802.11ac standard, the GI used is 0.8us in length.
  • the AP and the STA use a preamble GI length of 0.8 us and a data GI length of 0.8 us.
  • the IEEE officially launched the next-generation WLAN standard in May 2013.
  • the High Efficiency WLAN (HEW) the standard for HEW will be called 802.11ax.
  • the HEW standard work proposes more choices in terms of GI length, including: GI lengths of 3.2us, 2.4, 1.6us, 1.2us, 0.8us, 0.4us, etc.
  • GI lengths of 3.2us, 2.4, 1.6us, 1.2us, 0.8us, 0.4us, etc.
  • the embodiment of the invention provides a data communication method and related device, which can implement data communication between the access device and the terminal when the access device supports multiple data protection interval lengths.
  • a first aspect of the present invention provides a data communication method, which may include:
  • the access device constructs a beacon frame, where the beacon frame includes a new field, and the newly added field represents a plurality of data protection interval lengths supported by the access device;
  • the access device broadcasts the beacon frame, so that the terminal selects an available guard interval length matching the length of the data protection interval supported by the terminal from the beacon frame, and utilizes the available guard interval length and location
  • the access device performs data communication.
  • the beacon frame includes at least one element, and a specific one of the at least one element carries the newly added field, where the specific element is existing Element or new element.
  • the newly added field includes an indication index value corresponding to each preset bandwidth, where the indication index value represents the access The minimum data protection interval length of all data protection interval lengths supported by the device under the preset bandwidth;
  • the newly added field includes an indication bit of each preset data protection interval length, where the indication bit is used to indicate whether the access device supports the preset data protection interval length; or
  • the newly added field includes an indication bit of each preset data protection interval length in each preset bandwidth, where the indication bit is used to indicate whether the access device supports the preset data in the preset bandwidth.
  • the length of the guard interval is used to indicate whether the access device supports the preset data in the preset bandwidth.
  • the method further includes:
  • the access device encapsulates the beacon frame into a first standard protocol data unit and a second standard protocol data unit, respectively;
  • the access device broadcasts the beacon frame, including:
  • the access device broadcasts the beacon frame encapsulated as the first standard protocol data unit and the beacon frame encapsulated as the second standard protocol data unit.
  • the multiple data protection interval lengths supported by the access device include the access device supported by the first standard.
  • the access device encapsulates the beacon frame into a first standard protocol data unit and a second standard protocol data unit, respectively, including:
  • the access device encapsulates the beacon frame into the first standard protocol data unit and the first, respectively, according to the first candidate data protection interval length and the second candidate data protection interval length Two standard protocol data units.
  • the first standard protocol data unit includes a preamble and bearer data, where the bearer data includes the beacon frame,
  • the preamble guard interval length and the guard interval length of the bearer data are the first candidate data guard interval length.
  • the second standard protocol data unit includes a traditional preamble, an efficient wireless local area network preamble, and bearer data, where the traditional preamble
  • the guard interval length, the guard interval length of the high-efficiency WLAN preamble, and the guard interval length of the bearer data are all the second candidate data guard interval length;
  • the second standard protocol data unit includes a traditional preamble, an efficient wireless local area network preamble, and bearer data, and a guard interval length of the traditional preamble is a length of the first candidate data protection interval, the high efficiency wireless local area network preamble And a guard interval length of the bearer data is a length of the second candidate data guard interval; or
  • the second standard protocol data unit includes an efficient wireless local area network preamble and bearer data, and a guard interval length of the high efficiency WLAN preamble and a guard interval length of the bearer data are both the second candidate data guard interval length .
  • the access device broadcasts the beacon frame encapsulated as the first standard protocol data unit, and the encapsulation is Before the beacon frame of the second standard protocol data unit, the method further includes:
  • the access device broadcasts the beacon frame encapsulated in the first standard protocol data unit and the beacon frame encapsulated in the second standard protocol data unit, including:
  • the access device broadcasts the first standard protocol data unit including the operation field in a preset period
  • the access device broadcasts the second standard protocol data unit at a transmission time indicated by the operation field.
  • a second aspect of the present invention provides a data communication method, which may include:
  • beacon frame that is broadcast by the access device, where the beacon frame includes a new field, where the newly added field represents a plurality of data protection interval lengths supported by the access device;
  • the terminal selects an available guard interval length that matches a data protection interval length supported by the terminal from a plurality of data protection interval lengths supported by the access device;
  • the terminal performs data communication with the access device by using the available guard interval length.
  • the beacon frame is encapsulated by a first standard protocol data unit and a second standard protocol data unit, where the access device sends the preset period.
  • the acquiring, by the terminal, the beacon frame broadcast by the access device includes:
  • the terminal Obtaining, by the terminal, the first standard protocol data unit that is broadcast by the access device, determining, by using an operation field in the first standard protocol data unit, a sending time of the second standard protocol data unit, and according to the Transmitting time acquires the second standard protocol data unit, and parses the beacon frame from the second standard protocol data unit.
  • a third aspect of the present invention provides an access device, including:
  • a constructing module configured to construct a beacon frame, where the beacon frame includes a new field, where the newly added field represents a plurality of data protection interval lengths supported by the access device;
  • transceiver module configured to broadcast the beacon frame and perform data communication with the terminal.
  • the beacon frame includes at least one element, and a specific one of the at least one element carries the newly added field, where the specific element is an existing element or Add an element.
  • the newly added field includes an indication index value corresponding to each preset bandwidth, where the indication index value represents the access The minimum data protection interval among all data protection interval lengths supported by the device under the preset bandwidth Separate length; or,
  • the newly added field includes an indication bit of each preset data protection interval length, where the indication bit is used to indicate whether the access device supports the preset data protection interval length; or
  • the newly added field includes an indication bit of each preset data protection interval length in each preset bandwidth, where the indication bit is used to indicate whether the access device supports the preset data in the preset bandwidth.
  • the length of the guard interval is used to indicate whether the access device supports the preset data in the preset bandwidth.
  • the access device further includes:
  • a packaging module configured to encapsulate the beacon frame into a first standard protocol data unit and a second standard protocol data unit, respectively;
  • the transceiver module is specifically configured to broadcast the beacon frame encapsulated into the first standard protocol data unit and the beacon frame encapsulated in the second standard protocol data unit.
  • the multiple data protection interval lengths supported by the access device include that the access device is supported by the first standard. a data protection interval length and a data protection interval length supported by the access device in the second standard; the encapsulation module includes:
  • a first acquiring unit configured to acquire a maximum data protection interval length of the data protection interval length supported by the access device in the first standard, and determine the length of the first candidate data protection interval
  • a second acquiring unit configured to acquire a maximum data protection interval length of the data protection interval length supported by the access device in the second standard, and determine the length of the second candidate data protection interval
  • An encapsulating unit configured to encapsulate the beacon frame into the first standard protocol data unit and the second, respectively, according to the first candidate data protection interval length and the second candidate data protection interval length Standard protocol data unit.
  • the first standard protocol data unit includes a preamble and bearer data, where the bearer data includes the beacon frame,
  • the preamble guard interval length and the guard interval length of the bearer data are the first candidate data guard interval length.
  • the second standard protocol data unit includes a traditional preamble, an efficient WLAN preamble, and bearer data, where the traditional preamble Protection interval length, length of protection interval of the efficient wireless local area network preamble And the guard interval length of the bearer data is the length of the second candidate data protection interval; or
  • the second standard protocol data unit includes a traditional preamble, an efficient wireless local area network preamble, and bearer data, and a guard interval length of the traditional preamble is a length of the first candidate data protection interval, the high efficiency wireless local area network preamble And a guard interval length of the bearer data is a length of the second candidate data guard interval; or
  • the second standard protocol data unit includes an efficient wireless local area network preamble and bearer data, and a guard interval length of the high efficiency WLAN preamble and a guard interval length of the bearer data are both the second candidate data guard interval length .
  • the access device further includes:
  • a processing module configured to add, in the first standard protocol data unit, an operation field for indicating a sending time of the second standard protocol data unit;
  • the transceiver module is specifically configured to broadcast, by using a preset period, the first standard protocol data unit that includes the operation field;
  • the transceiver module is further configured to broadcast the second standard protocol data unit at a sending time indicated by the operation field.
  • a fourth aspect of the present invention provides a terminal, including:
  • a transceiver module configured to acquire a beacon frame broadcast by the access device, where the beacon frame includes a new field, where the newly added field represents a plurality of data protection interval lengths supported by the access device;
  • a selection module configured to select, from a plurality of data protection interval lengths supported by the access device, an available guard interval length that matches a data protection interval length supported by the terminal;
  • the transceiver module is further configured to perform data communication with the access device by using the available guard interval length.
  • the beacon frame is encapsulated by a first standard protocol data unit and a second standard protocol data unit, where the access device sends the preset period.
  • the transceiver module is configured to acquire the first standard protocol data unit that is broadcast by the access device, and parse the beacon frame from the first standard protocol data unit;
  • the transceiver module is specifically configured to acquire the second standard protocol data unit that is broadcast by the access device, and parse the beacon frame from the second standard protocol data unit; or
  • the transceiver module is specifically configured to acquire the first standard protocol data unit that is broadcast by the access device, and determine, by using an operation field in the first standard protocol data unit, a sending time of the second standard protocol data unit, And acquiring the second standard protocol data unit according to the sending time, and parsing the beacon frame from the second standard protocol data unit.
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the added field represents multiple data protection interval lengths supported by the access device, and the access device broadcasts the configured beacon frame.
  • the terminal selects an available guard interval length that matches the length of the data protection interval supported by the terminal from the beacon frame broadcasted by the access device, and communicates with the access device by using the available guard interval length.
  • a plurality of data protection interval lengths supported by the access device may be encapsulated into a new field of the beacon frame, and the access device and the terminal are successfully implemented. Data communication.
  • FIG. 1 is an application scenario diagram of a data communication method provided by the invention
  • FIG. 2 is a schematic flow chart of a data communication method provided by the present invention.
  • FIG. 3 is a schematic flowchart diagram of another data communication method according to the present invention.
  • FIG. 4 is a schematic flowchart diagram of still another data communication method according to the present invention.
  • FIG. 5 is a schematic flowchart diagram of still another data communication method according to the present invention.
  • FIG. 6 is a schematic structural diagram of a new element provided by the present invention.
  • FIG. 7 is a schematic structural diagram of another new element provided by the present invention.
  • FIG. 9 is another data GI length table supported by an AP in the HEW standard according to the present invention.
  • FIG. 10 is a table for indicating an index value according to the present invention.
  • FIG. 11 is a schematic structural diagram of a newly added field provided by the present invention.
  • FIG. 13 is a schematic structural diagram of another newly added field provided by the present invention.
  • FIG. 14 is another table for explaining an explanation of a newly added field according to the present invention.
  • FIG. 15 is still another data GI length table supported by an AP in the HEW standard according to the present invention.
  • 17 is another table for explaining an explanation of a newly added field according to the present invention.
  • Figure 18 is a package format of PPDU1 in the 802.11ac standard
  • FIG. 19 is a package format of a PPDU 2 according to the present invention.
  • 21 is a package format of another PPDU 2 provided by the present invention.
  • FIG. 22 is another explanatory diagram of each field in the PPDU 2 provided by the present invention.
  • FIG. 23 is still another encapsulation format of a PPDU 2 according to the present invention.
  • FIG. 24 is a diagram for explaining another explanation of each field in the PPDU 2 according to the present invention.
  • 25 is a broadcast manner of PPDU1 and PPDU2 provided by the present invention.
  • 26 is a manner of broadcasting another PPDU1 and PPDU2 provided by the present invention.
  • FIG. 27 is a schematic structural diagram of an access device according to the present invention.
  • 29 is a schematic structural diagram of a terminal provided by the present invention.
  • FIG. 30 is a schematic structural diagram of another access device according to the present invention.
  • FIG. 31 is a schematic structural diagram of another terminal according to the present invention.
  • the access device may be an access point (abbreviation: AP, English: Access Point), which is also called a wireless access point or hotspot.
  • AP is an access point for mobile users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors.
  • An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet.
  • the standard adopted by AP is IEEE (English: Institute of Electrical and Electronics Engineers) 802.11 series.
  • the AP may be a terminal device or a network device with a WiFi chip.
  • the AP may be a device that supports the 802.11ax system. Further, the AP may be configured to support multiple WLANs such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a (English: Wireless Local Area Network, Chinese: Wireless LAN) Standard equipment.
  • the terminal can be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • a mobile phone that supports Wireless Fidelity (English: Wireless Fidelity, WiFi for short) communication
  • a tablet that supports WiFi communication
  • a set-top box that supports WiFi communication
  • a computer that supports WiFi communication.
  • the terminal can support the 802.11ax system.
  • the terminal supports multiple WLAN systems such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • the data GI length used in the data communication between the AP and the STA is 0.8 us.
  • more choices are made in the data GI length. , including: 0.4us, 0.8us, 1.2us, 1.6us, 2.4us, 3.2us and other data length GI, the data GI length solidified in the prior art cannot meet the data communication between the AP and the STA in the new HEW standard. As shown in FIG.
  • the embodiment of the present invention can be applied to the application scenario of FIG. 1.
  • the AP broadcasts a beacon frame to all STAs, where the beacon frame carries a new field, and the added field is used to represent multiple data GI lengths supported by the AP.
  • the terminal receives the beacon frame broadcasted by the AP, parses the length of the multiple data GIs supported by the AP, and selects the length of the data GI that matches the length of the data GI supported by the terminal as the data between the AP and the AP.
  • the data GI length used in the communication the embodiment of the present invention can successfully implement data communication between the AP and the STA in the case of various data GI lengths proposed in the HEW standard.
  • the data communication method in this embodiment includes steps S100-S101;
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the newly added field represents multiple data protection interval lengths supported by the access device.
  • the data GI length supported by the next-generation standard scheme HEW currently being studied by the current standard group is ⁇ 0.4us, 0.8us, 1.6us, 2.4us, 3.2us ⁇
  • the access device may be a wireless access point (Access).
  • Point, AP in order to better indicate the data GI length information, the present invention adds a new field in the Beacon frame of the beacon frame, and records it as the “HE Support GI” field, which is used to represent the AP support.
  • the "HE Support GI” is used to exchange the data GI lengths supported by the AP and the STA. The following is described in detail from the location of the "HE Support GI” field, the format of the "HE Support GI” field, and the like.
  • the "HE Support GI" field can be placed anywhere in the Beacon frame.
  • the field can be placed in an existing element of the Beacon frame, or a new element can be created in the Beacon frame.
  • the field may also be placed in the SIG field of the Presentation Protocol Data Unit (PPDU) frame carrying the object layer of the Beacon frame.
  • PPDU Presentation Protocol Data Unit
  • the "HE Support GI” field is placed directly in the "HE Capabilities” element, and the "HE Capabilities” information element contains an AP that is used to describe an AP that supports a certain WLAN scheme. Select the ability field.
  • the "HE Support GI” field is placed in the "HE Capabilities” element, for example, as shown in Figure 6.
  • the "HE Support GI” field is placed in a field of the "HE Capability” element.
  • the "HE Capability” element includes an "HE Capability Information” field. This field is used to indicate the capability information of the AP.
  • the "HE Support GI” field can be placed in the "HE Capability Information” field described above.
  • the new field "HE Support GI” field in the present invention indicates the data GI length supported by the AP.
  • the supported bandwidth is 20 MHz, 40 MHz, 80 MHz or 160 MHz.
  • N 1, 2, 3, ... 32
  • the newly added field includes an indication index value corresponding to each preset bandwidth, where the indication index value represents all data protection supported by the access device under the preset bandwidth.
  • the minimum data protection interval length in the interval length, the preset bandwidth may include 20MHz, 40MHz, 80MHz, and 160MHz, and the specific representation may be, for convenience of description: all supported by different bandwidths shown in the table of FIG. 8
  • the length of the M data GI is arbitrarily selected as the GI length supported by the AP, as shown in FIG. Where N represents a sequence number, the value of N is ⁇ 1, 2, ..., M ⁇ , m represents the number of bits of the indication bit, and N corresponds to the value of the indication bit.
  • min_GI minimum data GI length supported by the AP
  • index value corresponding to min_GI is N
  • min_GI minimum data GI length supported by the AP
  • the indication index value included in the "HE Support GI” field means that the "HE Support GI” field indicates an index value corresponding to min_GI under different bandwidths.
  • the "HE Support GI” field indicates that the index value corresponding to min_GI in different bandwidths means that the "HE Support GI” field carries the sequence number corresponding to the min_GI supported under each bandwidth. For example: the length of the data GI supported in the 20MHz bandwidth is ⁇ 0.8us, 1.2us, 1.6us, 2.0, 2.4us, 2.8, 3.2us ⁇ , assuming that the min_GI supported by the 20MHz bandwidth is 0.8us. Then, the index index value of the 20M serial number is 2. 40 MHz, 80 MHz, and 160 MHz processing reference 20 MHz.
  • the indication index value of the “HE Support GI” field in the Beacon frame is expressed in a binary code format, that is, in the form of an indicator bit.
  • the specific representation is as shown in FIG. 11 , “HE supports GI.
  • the field includes an indication index value for each of the preset bandwidths, and the indication index value GI_Idx is represented by bit information.
  • the specific bit information is shown in FIG.
  • the newly added field includes an indication bit of each preset data protection interval length, where the indication bit is used to indicate whether the access device supports the preset data protection interval length;
  • the lengths of the M data GIs are arbitrarily selected from the length of the data GI shown in FIG. 8 as the preset data GI length, for example, the preset data GI length is ⁇ 0.4us, 0.8us, 1.2us, 1.6us, 2.0us, 2.4us, 2.8us, 3.2us ⁇ .
  • the "HE Support GI” field indicates whether the AP supports the preset data GI length by using an indication bit, and the "HE Support GI” field may use an indication bit of a single bit to indicate each of the preset data GI lengths. Length, each bit information bit indicates a data GI length, and the "HE Support GI” field is represented as shown by 13, one bit indicating a data GI length. The specific bit information indication is as shown in FIG.
  • the newly added field includes an indication bit of each preset data protection interval length in each preset bandwidth, where the indication bit is used to indicate whether the access device is The preset data protection interval length in the preset bandwidth is supported.
  • the "HE Support GI” field indicates that the supported data GI length under each bandwidth means that the "HE Support GI” field uses a single bit indication bit to indicate the data GI length supported by the AP, that is, each bit indicates support under different bandwidths respectively.
  • the data GI length, the representation of the "HE Support GI” field is shown in Figure 16.
  • the specific bit information is shown in Figure 17.
  • the access device broadcasts the beacon frame, so that the terminal selects an available guard interval length that matches a data guard interval length supported by the terminal from the beacon frame, and uses the available guard interval length. Data communication with the access device.
  • the access device broadcasts the configured beacon frame
  • the specific broadcast method may be to encapsulate the beacon frame and encapsulate the PPDU format for broadcast, and the PPDU format may be encapsulated.
  • it can be encapsulated into PPDU1 according to 802.11ac in the existing standard, or a new encapsulation method can be created according to the new generation standard HEW, and the beacon frame is encapsulated into PPDU2.
  • a new encapsulation method can be created according to the new generation standard HEW
  • the beacon frame is encapsulated into PPDU2.
  • the terminal supporting the new generation of standard HEW can recognize and parse PPDU2.
  • the access device AP needs to broadcast the encapsulated PPDU1 and PPDU2,
  • the broadcast mode of the PPDU 1 may broadcast the PPDU 1 in a preset period according to the existing standard.
  • an operation field may be added in the PPDU 1, and the operation field indicates the broadcast time of the PPDU 2, and the broadcast time indicated in the operation field is broadcasted. PPDU2.
  • the STA1 After receiving the beacon frame encapsulated in the PPDU1 format, the STA1 accesses the network according to the existing 802.11ac standard, and after detecting the PPDU1 and/or the PPDU2, the STA2 parses the Beacon frame of the beacon frame and analyzes each Beacon frame.
  • the capability element and the "HE support GI" field in the parsing capability element obtain the data GI length supported by the AP, and the STA2 obtains the available data GI length when communicating with the AP according to the length of the support data GI, and the available data GI length refers to the AP supported The length of the data GI in the data GI length that matches the data GI length supported by STA2.
  • the length of the data GI supported by STA2 is ⁇ 0.8us, 1.6us, 2.4us, 3.2us ⁇
  • the length of the data GI supported by the AP is ⁇ 0.4us, 0.8us, 1.6us, 2.0us, 2.4us, 3.2us ⁇ .
  • the data GI length supported by both AP and STA2 is ⁇ 0.8us, 1.6us, 2.4us, 3.2us ⁇ , and ⁇ 0.8us, 1.6us, 2.4us, 3.2us ⁇ is the available data GI length.
  • the STA2 communicates with the AP by using the optional data GI length. Specifically, STA2 can select a data GI length from the available data GI length to perform data communication with the AP according to the channel condition.
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the added field represents multiple data protection interval lengths supported by the access device, and the access device broadcasts the configured beacon frame.
  • the terminal selects an available guard interval length that matches the length of the data protection interval supported by the terminal from the beacon frame broadcasted by the access device, and communicates with the access device by using the available guard interval length.
  • a plurality of data protection interval lengths supported by the access device may be encapsulated into a new field of the beacon frame, and the access device and the terminal are successfully implemented. Data communication between.
  • FIG. 3 is another data communication method according to an embodiment of the present invention.
  • the data communication method of this embodiment includes steps S200-S202;
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the newly added field represents a plurality of data protection interval lengths supported by the access device;
  • the access device encapsulates the beacon frame into a first standard protocol data unit and a second standard protocol data unit, respectively.
  • a case where STAs supporting the first standard and the second standard are simultaneously present in one network is considered.
  • STA1 supports the first standard
  • STA2 supports the second standard.
  • the first standard or the second standard is a different WIFI solution, and may be an existing WIFI standard solution such as 802.11ac, or a new generation standard solution HEW that the current standard group is studying, or other similar WIFI solutions.
  • the access device AP When the access device AP encapsulates the beacon frame into the PPDU format, it needs to be encapsulated into two PPDU formats, which are the first standard protocol data unit PPDU1 and the second standard protocol data unit PPDU2, and the PPDU1 is encapsulated according to the first standard, PPDU2. Packaged according to the second standard.
  • the access device acquires a maximum data protection interval length of the data protection interval length supported by the access device in the first standard, and determines the length of the first candidate data protection interval;
  • the AP supports a set of data GI lengths in the first standard and the second standard, respectively.
  • the first candidate data GI length refers to a maximum data GI length in a group of GIs supported by the AP in the first standard. For example, assuming that the data GI length supported by the AP in the first standard is ⁇ 0.4us, 0.8us ⁇ , the first candidate data GI length refers to a data GI length of length 0.8us.
  • the access device acquires a maximum data protection interval length of the data protection interval length supported by the access device in the second standard, and determines the length of the second candidate data protection interval;
  • the AP also supports a set of data GI lengths in the second standard, and the second candidate data protection interval length refers to a maximum data GI length in a set of GIs supported by the AP in the second standard. For example, suppose the AP supports a set of data GI lengths in the second standard of ⁇ 0.4us, 0.8us, 1.6. Us, 2.4us, 3.2us ⁇ , then the second alternative data GI length refers to the data GI length of 3.2us.
  • STA supporting different standards in a network is more diverse, there are multiple types of STAs, and different types of STAs support different standards, but STAs supporting different standards may exist between STAs. Compatible, but only forward compatible, not backward compatible. For example, STAs that support HEW are compatible with STAs that support the 802.11ac standard, but STAs that support the 802.11ac standard cannot support STAs of the HEW standard.
  • the candidate data GI length may be correspondingly determined, and the candidate data is The number of GI lengths corresponds to 3, 4 or more.
  • a first standard such as an 802.11ac standard scheme
  • a second standard such as a current HEW standard scheme
  • the access device encapsulates the beacon frame into the first standard protocol data unit and the foregoing according to the first candidate data protection interval length and the second candidate data protection interval length, respectively. Second standard protocol data unit.
  • the access device encapsulates the beacon frame into the first standard protocol data unit PPDU1 and the second standard protocol data unit PPDU2 according to the first candidate data protection interval length GI1 and the second candidate data protection interval length GI2.
  • the constructed PPDU1 and PPDU2 shall conform to the PPDU format in their respective standards. The format of PPDU2 and PPDU2 are described below.
  • the PPDU1 format includes a preamble and bearer data, where the bearer data includes a beacon frame, and the preamble GI length and the data GI length are GI1 in the PPDU1 format, as shown in FIG. 18.
  • the purpose of the AP to send PPDU1 is to enable STA1 that supports the first standard to detect the network.
  • the first standard can be the 802.11ac standard.
  • the second standard may be the HEW standard.
  • the PPDU2 format has various design methods, which are not limited herein. The following three optional PPDU2 format designs are listed:
  • the PPDU 2 includes a traditional preamble, an efficient WLAN preamble, and bearer data, as shown in FIG. 19, wherein a combination of L-STF, L-LTF, and L-SIG is called a legacy preamble.
  • the combination of codes, HE-SIG, HE-STF, and other possible fields is called the HEW preamble.
  • the GI length of the conventional preamble, the GI length of the HEW preamble, and the GI length of the bearer data are both GI2.
  • the AP sends the PPDU2 to enable the STA2 that supports the second standard to detect the network. It is that STA2 can also detect PPDU1 and process it.
  • the explanation of each field in Fig. 19 is as shown in Fig. 20.
  • the format of the PPDU2 includes a traditional preamble, an efficient wireless local area network preamble, and bearer data, where the GI length of the traditional preamble is GI1, and the GI of the HEW preamble is used.
  • the length of the GI with the length and bearer data is GI2.
  • the AP sends the PPDU2 in order to allow the STA2 supporting the second standard to detect the network.
  • FIG. 20 shows that the traditional preamble length of the PPDU2 format is 80 us in the first alternative embodiment, and the conventional preamble of the PPDU2 format is 20us in the second alternative embodiment, in the remaining fields. With the same length, the transmission overhead can be reduced by 60us when using the second alternative implementation.
  • the explanation of each field in Fig. 21 is as shown in Fig. 22.
  • the format of the PPDU 2 is as shown in FIG. 23, and the PPDU 2 includes an efficient wireless local area network preamble and bearer data.
  • the explanation of each field in Fig. 23 is as shown in Fig. 24.
  • the GI length of the HEW preamble and the GI length of the bearer data are both GI2, and the AP sends the PPDU2 in order to enable the STA2 supporting the second standard to detect the network.
  • the traditional preamble is removed from the PPDU format in the third alternative embodiment. Therefore, in the case where the remaining fields are the same length, the transmission overhead is reduced by 80 us compared to the PPDU format in the first alternative embodiment.
  • the access device broadcasts the beacon frame encapsulated into the first standard protocol data unit and the beacon frame encapsulated as the second standard protocol data unit.
  • the access device broadcasts a beacon frame encapsulated as PPDU1 and a beacon frame encapsulated as PPDU2.
  • the specific broadcast mode may be that the broadcast of the PPDU1 is broadcasted according to a preset period, and the broadcast of the PPDU2 may be designated to be broadcast. Time, but need to add an operation field in PPDU1 and indicate the sending time of PPDU2.
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the added field represents multiple data protection interval lengths supported by the access device, and the access device broadcasts the configured beacon frame.
  • the terminal selects an available guard interval length that matches the length of the data protection interval supported by the terminal from the beacon frame broadcasted by the access device, and communicates with the access device by using the available guard interval length.
  • the access device in the standard for proposing multiple data protection interval lengths, can support more The data protection interval length is encapsulated into a new field of the beacon frame, and the data communication between the access device and the terminal is successfully implemented.
  • the data communication method in this embodiment includes steps S300-S304.
  • the access device constructs a beacon frame, where the beacon frame includes a new field, and the newly added field represents a plurality of data protection interval lengths supported by the access device;
  • the access device encapsulates the beacon frame into a first standard protocol data unit and a second standard protocol data unit, respectively.
  • the access device adds an operation field for indicating a sending time of the second standard protocol data unit in the first standard protocol data unit.
  • the AP sends the constructed PPDU1 and PPDU2. It is assumed that the PPDU1 is constructed according to the 802.11ac standard.
  • the transmission period of the PPDU1 specified in the 802.11ac standard is T1, and the time at which the AP sends the PPDU2 can be arbitrarily specified.
  • the AP alternately sends PPDU1 and PPDU2; and the operation field can also be added to the PPDU1.
  • the operation field is used to indicate the transmission time of PPDU2. There are various indication ways for how the operation field indicates the transmission time of PPDU2. Only two of them are listed below.
  • the value of the HE operation field in the first PPDU1 from the left indicates that there is PPDU2 in the next m*T period; the value of the HE operation field in the second PPDU1 is 0, then the next m* There is no PPDU2 in the T period.
  • the access device broadcasts the first standard protocol data unit that includes the operation field in a preset period.
  • the access device broadcasts the PPDU1 including the operation field in a preset period.
  • the PPDU1 may be encapsulated according to the 802.11ac standard. Therefore, the broadcast PPDU1 may also be broadcast according to a preset period in the 802.11ac standard.
  • the access device broadcasts the second standard protocol data unit at a sending time indicated by the operation field.
  • the access device broadcasts the PPDU2 at the transmission time indicated by the operation field, and the terminal can learn the transmission time of the PPDU2 according to the operation field when receiving the PPDU1, and receive the received time at the obtained transmission time. PPDU2.
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the added field represents multiple data protection interval lengths supported by the access device, and the access device broadcasts the configured beacon frame.
  • the terminal selects an available guard interval length that matches the length of the data protection interval supported by the terminal from the beacon frame broadcasted by the access device, and communicates with the access device by using the available guard interval length.
  • a plurality of data protection interval lengths supported by the access device may be encapsulated into a new field of the beacon frame, and the access device and the terminal are successfully implemented. Data communication.
  • the data communication method in this embodiment includes steps S400-S402;
  • the terminal acquires a beacon frame that is broadcast by the access device, where the beacon frame includes a new field, where the new field indicates a plurality of data protection interval lengths supported by the access device.
  • the terminal STA obtains a beacon frame broadcasted by the access device, and the beacon frame may be a Beacon frame.
  • the beacon frame includes a new field, and the added field indicates multiple data GI lengths supported by the access device.
  • the STA processing flow corresponds to the foregoing access device AP processing flow.
  • the AP side encapsulates the Beacon frame with the first standard protocol data unit PPDU1 and the second standard protocol data unit PPDU2.
  • the first standard may be the 802.11ac standard
  • the second standard may be the HEW standard.
  • STA1 supporting the first standard and STA2 supporting the second standard
  • STA1 can only perform normal detection processing on PPDU1.
  • For the detection processing method refer to the 802.11ac standard scheme, which is not described here.
  • the STA processing procedure described herein refers to the processing flow of the aforementioned STA2.
  • the AP transmits PPDU1 in a preset period, and the PPDU1 includes an operation field for indicating the transmission time of the PPDU2, and the operation field indicates the transmission time of the PPDU2.
  • the STA obtains the Beacon frame method broadcast by the AP, and there are three optional implementation manners:
  • the STA acquires the PPDU1 broadcast by the AP, and the STA processes the PPDU1, parses the Beacon frame from the PPDU1, and the STA determines the data communication between the subsequent STA and the AP according to the preamble of the PPDU1.
  • the preamble length for example, the preamble of PPDU1 is GI1, and the preamble of the STA setting subsequent data communication is GI1.
  • the STA obtains the PPDU2 broadcast by the AP, and the STA processes the PPDU2, and parses the Beacon frame from the PPDU2, and the STA determines the data communication between the subsequent STA and the AP according to the preamble of the PPDU2.
  • the preamble length for example, the preamble of PPDU2 is GI2, and the preamble of the STA setting subsequent data communication is GI2.
  • the STA receives the PPDU1, and then obtains the sending time of the next PPDU2 from the PPDU1 by parsing the “HE Operation” field. For example: Suppose the "HE Operation” field uses one bit to indicate whether there is PPDU2 in the next cycle. If the "HE Operation” field indicates 0, it indicates that the STA needs to detect PPDU2 on the next cycle; if the "HE Operation” field indicates bit 1, it indicates that the STA does not need to detect PPDU2 on the next cycle. The STA parses out the Beacon frame from the detected PPDU2.
  • the STA determines the preamble length of the data communication between the STA and the AP according to the preamble of the PPDU 2. For example, if the preamble of the PPDU 2 is GI2, the STA sets the preamble of the subsequent data communication to be GI2.
  • the terminal selects an available guard interval length that matches a data protection interval length supported by the terminal, from multiple data protection interval lengths supported by the access device.
  • the terminal STA obtains the Beacon frame of the beacon frame and analyzes the specific capability of the Beacon frame.
  • the STA detects the capability elements of the Beacon frame and parses the HE supported by the GI field to obtain the length of the data GI supported by the AP.
  • the available data GI length is set according to the length of the data GI supported by itself and the data GI length supported by the acquired AP. For example, if the data GI length indicated by the "HE Support GI" field information is ⁇ 0.8us, 1.6us, 2.4us ⁇ , the data GI supported by the AP is as follows. The length is ⁇ 0.8us, 1.6us, 2.4us ⁇ .
  • the length of the GI supported by the STA is ⁇ 0.4us, 0.8us, 1.6us, 2.4us, 3.2us ⁇ .
  • the length of the data GI supported by both AP and STA2 is ⁇ 0.8us, 1.6us, ⁇ , at this time ⁇ 0.8us, 1.6us ⁇ is the length of the available data GI as described.
  • a PGI is constructed by selecting a data GI length from the available data GI length according to channel conditions.
  • the terminal performs data communication with the access device by using the available guard interval length.
  • the STA can use the available data GI length to perform data communication with the AP. Specifically, in the communication between the subsequent STA and the AP, the length of the available data GI according to the channel condition. Select a data GI length to construct a PPDU.
  • the STA generates an association request frame according to the available data GI length, and sends the association request frame to the AP.
  • the AP analyzes the association request frame, and returns the association response frame to the STA if the STA is allowed to access the network.
  • the STA parses the STA. At this time, the STA establishes an association with the AP, and the subsequent AP and the STA can perform data communication to transmit data.
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the added field represents multiple data protection interval lengths supported by the access device, and the access device broadcasts the configured beacon frame.
  • the terminal selects an available guard interval length that matches the length of the data protection interval supported by the terminal from the beacon frame broadcasted by the access device, and communicates with the access device by using the available guard interval length.
  • a plurality of data protection interval lengths supported by the access device may be encapsulated into a new field of the beacon frame, and the access device and the terminal are successfully implemented. Data communication.
  • FIG. 27 is a schematic structural diagram of an access device according to the present invention.
  • the access device provided by the present embodiment includes a structure module 100, a package module 101, a processing module 102, and a transceiver module 103.
  • the constructing module 100 is configured to construct a beacon frame, where the beacon frame includes a new field, and the newly added field represents a plurality of data protection interval lengths supported by the access device;
  • the data GI length supported by the next-generation standard scheme HEW currently being studied by the current standard group is ⁇ 0.4us, 0.8us, 1.6us, 2.4us, 3.2us ⁇ , and the access device may be wireless access.
  • Point Access Point, AP
  • the constructing module 100 of the present invention adds a new field in the Beacon frame of the beacon frame, and records it as the “HE Support GI” field, and the added field is used.
  • the "HE Support GI” is used to exchange the data GI lengths supported by the AP and the STA. The following is described in detail from the location of the "HE Support GI” field, the format of the "HE Support GI” field, and the like.
  • the "HE Support GI" field can be placed anywhere in the Beacon frame.
  • the field can be placed in an existing element of the Beacon frame, or a new element can be created in the Beacon frame.
  • the field may also be placed in the SIG field of the Presentation Protocol Data Unit (PPDU) frame carrying the object layer of the Beacon frame.
  • PPDU Presentation Protocol Data Unit
  • the "HE Support GI” field is placed directly in the "HE Capabilities” element, and the "HE Capabilities” information element contains fields that describe the optional capabilities of the AP supporting a certain WLAN scheme. .
  • the "HE Support GI” field is placed in the "HE Capabilities” element, for example, as shown in Figure 6.
  • the "HE Support GI” field is placed in a field of the "HE Capability” element.
  • the "HE Capability” element includes an "HE Capability Information” field. This field is used to indicate the capability information of the AP.
  • the "HE Support GI” field can be placed in the "HE Capability Information” field described above.
  • the new field "HE Support GI” field in the present invention indicates the data GI length supported by the AP.
  • the supported bandwidth is 20 MHz, 40 MHz, 80 MHz or 160 MHz.
  • N 1, 2, 3, ... 32
  • the newly added field includes an indication index value corresponding to each preset bandwidth, where the indication index value represents all data protection supported by the access device under the preset bandwidth.
  • the minimum data protection interval length in the interval length, the preset bandwidth may include 20MHz, 40MHz, 80MHz, and 160MHz, and the specific representation may be, for convenience of description: here from FIG.
  • the M data GI lengths of any data GI length supported by different bandwidths shown in the table are selected as the GI length supported by the AP, as shown in FIG.
  • N represents a sequence number
  • the value of N is ⁇ 1, 2, ..., M ⁇
  • m represents the number of bits of the indication bit
  • N corresponds to the value of the indication bit.
  • min_GI minimum data GI length supported by the AP
  • index value corresponding to min_GI is N
  • min_GI minimum data GI length supported by the AP
  • the indication index value included in the "HE Support GI” field means that the "HE Support GI” field indicates an index value corresponding to min_GI under different bandwidths.
  • the "HE Support GI” field indicates that the index value corresponding to min_GI in different bandwidths means that the "HE Support GI” field carries the sequence number corresponding to the min_GI supported under each bandwidth. For example: The data GI length supported in the 20MHz bandwidth is ⁇ 0.8us, 1.2us, 1.6us, 2.0, 2.4us, 2.8, 3.2us ⁇ , assuming that the min_GI supported by the 20MHz bandwidth is 0.8us. Then, the index index value of the 20M serial number is 2. 40 MHz, 80 MHz, and 160 MHz processing reference 20 MHz.
  • the indication index value of the “HE Support GI” field in the Beacon frame is expressed in a binary code format, that is, in the form of an indicator bit.
  • the specific representation is as shown in FIG. 11 , “HE supports GI.
  • the field includes an indication index value for each of the preset bandwidths, and the indication index value GI_Idx is represented by bit information.
  • the specific bit information is shown in FIG.
  • the newly added field includes an indication bit of each preset data protection interval length, where the indication bit is used to indicate whether the access device supports the preset data protection interval length;
  • the lengths of the M data GIs are arbitrarily selected from the length of the data GI shown in FIG. 8 as the preset data GI length, for example, the preset data GI length is ⁇ 0.4us, 0.8us, 1.2us, 1.6us, 2.0us, 2.4us, 2.8us, 3.2us ⁇ .
  • the "HE Support GI” field indicates whether the AP supports the preset data GI length by using an indication bit, and the "HE Support GI” field may use an indication bit of a single bit to indicate each of the preset data GI lengths. Length, each bit information bit indicates a data GI length, and the "HE Support GI” field is represented as shown in FIG. 13, one bit indicating a data GI length. The specific bit information indication is as shown in FIG.
  • the newly added field includes an indication bit of each preset data protection interval length in each preset bandwidth, where the indication bit is used to indicate whether the access device is The preset data protection interval length in the preset bandwidth is supported.
  • the "HE Support GI” field indicates that the supported data GI length under each bandwidth means that the "HE Support GI” field uses a single bit indication bit to indicate the data GI length supported by the AP, that is, each bit indicates support under different bandwidths respectively.
  • the data GI length, the representation of the "HE Support GI” field is shown in Figure 16.
  • the specific bit information is shown in Figure 17.
  • the transceiver module 103 is configured to broadcast the beacon frame and perform data communication with the terminal.
  • the access device transceiver module 103 broadcasts the configured beacon frame.
  • the specific broadcast method may be to encapsulate the beacon frame and encapsulate the PPDU format for broadcast.
  • the PPDU format may be encapsulated in multiple manners, for example, It can be encapsulated into PPDU1 according to the existing standard 802.11ac, or a new encapsulation method can be created according to the new generation standard HEW, and the beacon frame is encapsulated into PPDU2.
  • a new encapsulation method can be created according to the new generation standard HEW
  • the beacon frame is encapsulated into PPDU2.
  • For the specific creation method refer to the description of the following embodiments to support the new A generation of standard HEW terminals can identify and parse PPDU2.
  • the access device AP needs to broadcast the encapsulated PPDU1 and PPDU2,
  • the broadcast mode of the PPDU 1 may broadcast the PPDU 1 in a preset period according to the existing standard.
  • an operation field may be added in the PPDU 1, and the operation field indicates the broadcast time of the PPDU 2, and the broadcast time indicated in the operation field is broadcasted. PPDU2.
  • the STA1 After receiving the beacon frame encapsulated in the PPDU1 format, the STA1 accesses the network according to the existing 802.11ac standard, and after detecting the PPDU1 and/or the PPDU2, the STA2 parses the Beacon frame of the beacon frame and analyzes each Beacon frame.
  • the capability element and the "HE support GI" field in the parsing capability element obtain the data GI length supported by the AP, and the STA2 obtains the available data GI length when communicating with the AP according to the length of the support data GI, and the available data GI length refers to the AP supported The length of the data GI in the data GI length that matches the data GI length supported by STA2.
  • the length of the data GI supported by STA2 is ⁇ 0.8us, 1.6us, 2.4us, 3.2us ⁇
  • the length of the data GI supported by the AP is ⁇ 0.4us, 0.8us, 1.6us, 2.0us, 2.4us, 3.2us ⁇ . It can be seen that the data GI supported by both AP and STA2 is long.
  • the degree is ⁇ 0.8us, 1.6us, 2.4us, 3.2us ⁇ , at which point ⁇ 0.8us, 1.6us, 2.4us, 3.2us ⁇ is the available data GI length.
  • the STA2 communicates with the AP by using the optional data GI length. Specifically, STA2 can select a data GI length from the available data GI length to perform data communication with the AP according to the channel condition.
  • the access device may further include a package module 101;
  • the encapsulating module 101 is configured to encapsulate the beacon frame into a first standard protocol data unit and a second standard protocol data unit, respectively;
  • a case where STAs supporting the first standard and the second standard are simultaneously present in one network is considered.
  • STA1 supports the first standard
  • STA2 supports the second standard.
  • the first standard or the second standard is a different WIFI solution, and may be an existing WIFI standard solution such as 802.11ac, or a new generation standard solution HEW that the current standard group is studying, or other similar WIFI solutions.
  • the encapsulation module 101 of the access device AP needs to be encapsulated into two PPDU formats, namely a first standard protocol data unit PPDU1 and a second standard protocol data unit PPDU2, and the PPDU1 is in accordance with the first standard.
  • PPDU2 is packaged according to the second standard.
  • the transceiver module 103 is specifically configured to broadcast the beacon frame encapsulated into the first standard protocol data unit and the beacon frame encapsulated in the second standard protocol data unit.
  • the access device transceiver module 103 broadcasts a beacon frame encapsulated as PPDU1 and a beacon frame encapsulated as PPDU2.
  • the specific broadcast mode may be that the broadcast of the PPDU1 is broadcasted according to a preset period, and the broadcast of the PPDU2 is broadcasted.
  • the broadcast time can be specified, but the operation field needs to be added in PPDU1 and the transmission time of PPDU2 is indicated.
  • the access device may further include a processing module 102;
  • the processing module 102 is configured to add, in the first standard protocol data unit, an operation field for indicating a sending time of the second standard protocol data unit;
  • the AP sends the constructed PPDU1 and PPDU2.
  • PPDU1 is constructed according to the 802.11ac standard.
  • the transmission period of PPDU1 specified in the 802.11ac standard is T1, and the time for the AP to send PPDU2 can be arbitrarily specified.
  • the AP alternately sends PPDU1 and PPDU2; the processing module 102 can add PPDU1.
  • the operation field is indicated, and the operation can also be added in PPDU2.
  • the field is indicated.
  • the operation field is used to indicate the transmission time of PPDU2. There are various indication ways for how the operation field indicates the transmission time of PPDU2. Only two of them are listed below.
  • the transceiver module 103 is specifically configured to broadcast the first standard protocol data unit including the operation field in a preset period;
  • the access device transceiver module 103 broadcasts the PPDU1 including the operation field in a preset period.
  • the PPDU1 may be encapsulated according to the 802.11ac standard. Therefore, the broadcast PPDU1 may also be performed according to a preset period in the 802.11ac standard. broadcast.
  • the transceiver module 103 is further configured to broadcast the second standard protocol data unit at a sending time indicated by the operation field.
  • the access device transceiver module 103 broadcasts the PPDU2 at the transmission time indicated by the operation field, and the terminal can know the transmission time of the PPDU2 according to the operation field when receiving the PPDU1, and obtain the known time.
  • the transmission time receives PPDU2.
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the added field represents multiple data protection interval lengths supported by the access device, and the access device broadcasts the configured beacon frame.
  • the terminal selects an available guard interval length that matches the length of the data protection interval supported by the terminal from the beacon frame broadcasted by the access device, and communicates with the access device by using the available guard interval length.
  • a plurality of data protection interval lengths supported by the access device may be encapsulated into a new field of the beacon frame, and the access device and the terminal are successfully implemented. data communication.
  • FIG. 28 is a schematic structural diagram of a package module according to the present invention. As shown in the figure, the package of the present embodiment includes a first obtaining unit 1030, a second obtaining unit 1031, and a packaging unit 1032.
  • the first obtaining unit 1030 is configured to acquire a maximum data protection interval length of the data protection interval length supported by the access device in the first standard, and determine the length of the first candidate data protection interval;
  • the AP supports a set of data GI lengths in the first standard and the second standard, respectively.
  • the first candidate data GI length refers to a maximum data GI length in a group of GIs supported by the AP in the first standard. For example, assuming that the data GI length supported by the AP in the first standard is ⁇ 0.4us, 0.8us ⁇ , the first candidate data GI length refers to a data GI length of length 0.8us.
  • the second obtaining unit 1031 is configured to acquire a maximum data protection interval length of the data protection interval length supported by the access device in the second standard, and determine the length as a second candidate data protection interval length;
  • the AP also supports a set of data GI lengths in the second standard, and the second candidate data protection interval length refers to a maximum data GI length in a set of GIs supported by the AP in the second standard. For example, if the length of a set of data GI supported by the AP in the second standard is ⁇ 0.4us, 0.8us, 1.6us, 2.4us, 3.2us ⁇ , the second candidate data GI length refers to the data GI length of 3.2us. .
  • STA supporting different standards in a network is more diverse, there are multiple types of STAs, and different types of STAs support different standards, but STAs supporting different standards may exist between STAs. Compatible, but only forward compatible, not backward compatible. For example, STAs that support HEW are compatible with STAs that support the 802.11ac standard, but STAs that support the 802.11ac standard cannot support STAs of the HEW standard.
  • the candidate data GI length may be correspondingly determined, and the candidate data is The number of GI lengths corresponds to 3, 4 or more.
  • GI1 and GI2 are denoted in terms of a second standard (e.g., current HEW standard scheme), and the alternative data GI lengths are denoted GI1 and GI2.
  • the encapsulating unit 1032 is configured to encapsulate the beacon frame into the first standard protocol data unit and the first, respectively, according to the first candidate data protection interval length and the second candidate data protection interval length Two standard protocol data units.
  • the access device encapsulating unit 1032 encapsulates the beacon frame into the first standard protocol data unit PPDU1 and the second standard protocol according to the first candidate data protection interval length GI1 and the second candidate data protection interval length GI2.
  • the data unit PPDU2, the constructed PPDU1 and PPDU2 need to conform to the PPDU format in the respective standards.
  • the format of PPDU2 and PPDU2 are described below.
  • the PPDU1 format includes a preamble and bearer data, where the bearer data includes a beacon frame, and the preamble GI length and the data GI length are GI1 in the PPDU1 format, as shown in FIG. 18.
  • the purpose of the AP to send PPDU1 is to enable STA1 that supports the first standard to detect the network.
  • the first standard can be the 802.11ac standard.
  • the second standard may be the HEW standard.
  • the PPDU2 format has various design methods, which are not limited herein. The following three optional PPDU2 format designs are listed:
  • the PPDU 2 includes a legacy preamble, an efficient WLAN preamble, and bearer data, as shown in FIG. 19, wherein a combination of L-STF, L-LTF, and L-SIG is called a legacy.
  • the combination of preamble, HE-SIG, HE-STF, and other possible fields is called the HEW preamble.
  • the GI length of the conventional preamble, the GI length of the HEW preamble, and the GI length of the bearer data are both GI2.
  • the AP sends the PPDU2 in order to allow the STA2 supporting the second standard to detect the network. It should be noted that STA2 can also detect the PPDU1 and process it.
  • the explanation of each field in Fig. 19 is as shown in Fig. 20.
  • the format of the PPDU2 includes a traditional preamble, an efficient wireless local area network preamble, and bearer data, where the GI length of the traditional preamble is GI1, and the GI of the HEW preamble is used.
  • the length of the GI with the length and bearer data is GI2.
  • the AP sends the PPDU2 in order to allow the STA2 supporting the second standard to detect the network.
  • FIG. 20 shows that the traditional preamble length of the PPDU2 format is 80 us in the first alternative embodiment, and the conventional preamble of the PPDU2 format is 20us in the second alternative embodiment, in the remaining fields. In the case of the same length, The transmission overhead can be reduced by 60 us when using the second alternative implementation.
  • the explanation of each field in Fig. 21 is as shown in Fig. 22.
  • the format of the PPDU 2 is as shown in FIG. 23, and the PPDU 2 includes an efficient wireless local area network preamble and bearer data.
  • the explanation of each field in Fig. 23 is as shown in Fig. 24.
  • the GI length of the HEW preamble and the GI length of the bearer data are both GI2, and the AP sends the PPDU2 in order to enable the STA2 supporting the second standard to detect the network.
  • the traditional preamble is removed from the PPDU format in the third alternative embodiment. Therefore, in the case where the remaining fields are the same length, the transmission overhead is reduced by 80 us compared to the PPDU format in the first alternative embodiment.
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the added field represents multiple data protection interval lengths supported by the access device, and the access device broadcasts the configured beacon frame.
  • the terminal selects an available guard interval length that matches the length of the data protection interval supported by the terminal from the beacon frame broadcasted by the access device, and communicates with the access device by using the available guard interval length.
  • a plurality of data protection interval lengths supported by the access device may be encapsulated into a new field of the beacon frame, and the access device and the terminal are successfully implemented. Data communication.
  • FIG. 29 is a schematic structural diagram of a terminal according to an embodiment of the present invention. As shown in the figure, the terminal in the embodiment of the present invention includes a transceiver module 200 and a selection module 201;
  • the transceiver module 200 is configured to acquire a beacon frame that is broadcast by the access device, where the beacon frame includes a new field, where the new field characterizes multiple data protection interval lengths supported by the access device;
  • the terminal STA transceiver module 200 acquires a beacon frame broadcasted by the access device, where the beacon frame may be a Beacon frame, the beacon frame includes a new field, and the newly added field represents multiple data supported by the access device. GI length.
  • the STA processing flow corresponds to the foregoing access device AP processing flow.
  • the AP side encapsulates the Beacon frame with the first standard protocol data unit PPDU1 and the second standard protocol data unit PPDU2.
  • the first standard may be the 802.11ac standard
  • the second standard may be the HEW standard.
  • STA1 supporting the first standard and STA2 supporting the second standard exist in the network, STA1 can perform normal detection processing only on PPDU1.
  • the method of detection processing can be found in the 802.11ac standard scheme. I won't go into details here.
  • the STA processing procedure described herein refers to the processing flow of the aforementioned STA2.
  • the AP transmits PPDU1 in a preset period, and the PPDU1 includes an operation field for indicating the transmission time of the PPDU2, and the operation field indicates the transmission time of the PPDU2.
  • the STA obtains the Beacon frame method broadcast by the AP, and there are three optional implementation manners:
  • the transceiver module 200 is specifically configured to acquire the first standard protocol data unit that is broadcast by the access device, and parse the beacon frame from the first standard protocol data unit.
  • the STA acquires the PPDU1 broadcast by the AP, and the STA processes the PPDU1, parses the Beacon frame from the PPDU1, and the STA determines the data communication between the subsequent STA and the AP according to the preamble of the PPDU1.
  • the preamble length for example, the preamble of PPDU1 is GI1, and the preamble of the STA setting subsequent data communication is GI1.
  • the transceiver module 200 is specifically configured to acquire the second standard protocol data unit that is broadcast by the access device, and parse the beacon frame from the second standard protocol data unit.
  • the STA obtains the PPDU2 broadcast by the AP, and the STA processes the PPDU2, and parses the Beacon frame from the PPDU2, and the STA determines the data communication between the subsequent STA and the AP according to the preamble of the PPDU2.
  • the preamble length for example, the preamble of PPDU2 is GI2, and the preamble of the STA setting subsequent data communication is GI2.
  • the transceiver module 200 is specifically configured to acquire the first standard protocol data unit that is broadcast by the access device, and determine the second standard protocol data from an operation field in the first standard protocol data unit. a sending time of the unit, and acquiring the second standard protocol data unit according to the sending time, and parsing the beacon frame from the second standard protocol data unit.
  • the STA receives the PPDU1, and then obtains the sending time of the next PPDU2 from the PPDU1 by parsing the “HE Operation” field. For example: Suppose the "HE Operation” field uses one bit to indicate whether there is PPDU2 in the next cycle. If the "HE Operation” field indicates 0, it indicates that the STA needs to detect PPDU2 on the next cycle; if the "HE Operation” field indicates bit 1, it indicates that the STA does not need to detect PPDU2 on the next cycle. The STA parses out the Beacon frame from the detected PPDU2.
  • the STA determines the preamble length of the data communication between the STA and the AP according to the preamble of the PPDU 2. For example, if the preamble of the PPDU 2 is GI2, the STA sets the preamble of the subsequent data communication to be GI2.
  • the selecting module 201 is configured to select, from a plurality of data protection interval lengths supported by the access device The length of the available guard interval that matches the length of the data guard interval supported by the terminal;
  • the terminal STA obtains the Beacon frame of the beacon frame and analyzes the specific capability of the Beacon frame.
  • the STA detects the capability elements of the Beacon frame and parses the HE supported by the GI field to obtain the length of the data GI supported by the AP.
  • the selection module 201 sets the available data GI length according to the length of the data GI supported by itself and the length of the data GI supported by the acquired AP. For example, assuming that the data GI length indicated by the "HE Support GI" field information is ⁇ 0.8us, 1.6us, 2.4us ⁇ , the length of the data GI supported by the AP is ⁇ 0.8us, 1.6us, 2.4us ⁇ .
  • the length of the GI supported by the STA is ⁇ 0.4us, 0.8us, 1.6us, 2.4us, 3.2us ⁇ .
  • the length of the data GI supported by both AP and STA2 is ⁇ 0.8us, 1.6us, ⁇ , at this time ⁇ 0.8us, 1.6us ⁇ is the length of the available data GI as described.
  • a PGI is constructed by selecting a data GI length from the available data GI length according to channel conditions.
  • the transceiver module 200 is further configured to perform data communication with the access device by using the available guard interval length.
  • the transceiver module 200 can perform data communication with the AP by using the available data GI length. Specifically, in the communication between the subsequent STA and the AP, the transceiver is available according to the channel status. A data GI length is selected among the data GI lengths to construct a PPDU.
  • the STA generates an association request frame according to the available data GI length, and sends the association request frame to the AP.
  • the AP analyzes the association request frame, and returns the association response frame to the STA if the STA is allowed to access the network.
  • the STA parses the STA. At this time, the STA establishes an association with the AP, and the subsequent AP and the STA can perform data communication to transmit data.
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the added field represents multiple data protection interval lengths supported by the access device, and the access device broadcasts the configured beacon frame.
  • the terminal selects an available guard interval length that matches the length of the data protection interval supported by the terminal from the beacon frame broadcasted by the access device, and communicates with the access device by using the available guard interval length.
  • a plurality of data protection interval lengths supported by the access device may be encapsulated into a new field of the beacon frame, and the access device and the terminal are successfully implemented. Data communication.
  • FIG. 30 is a schematic structural diagram of another access device according to the present invention.
  • the access device 30 of FIG. 30 can be used to implement the steps and methods in the foregoing method embodiments.
  • access device 30 includes a processor 300, a transceiver 301, a memory 302, an antenna 303, and a bus 304.
  • the processor 300 controls the operation of the access device 30 and can be used to process signals.
  • Memory 302 can include read only memory and random access memory and provides instructions and data to processor 300.
  • Transceiver 301 can be coupled to antenna 303.
  • the various components of access device 30 are coupled together by a bus system 304, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 304 in the figure.
  • Access device 30 can be the AP shown in FIG. The individual components are described in detail below:
  • the processor is configured to construct a beacon frame, where the beacon frame includes a new field, and the newly added field represents a plurality of data protection interval lengths supported by the access device;
  • the transceiver is configured to broadcast the beacon frame and perform data communication with the terminal.
  • the data GI length supported by the next-generation standard scheme HEW currently being studied by the current standard group is ⁇ 0.4us, 0.8us, 1.6us, 2.4us, 3.2us ⁇
  • the access device may be a wireless access point (Access Point).
  • the present invention adds a new field in the Beacon frame of the beacon frame, and records it as the “HE Support GI” field, which is used to represent multiple types supported by the AP. GI length.
  • the "HE Support GI” is used to exchange the data GI lengths supported by the AP and the STA. The following is described in detail from the location of the "HE Support GI” field, the format of the "HE Support GI” field, and the like.
  • the "HE Support GI" field can be placed anywhere in the Beacon frame.
  • the field can be placed in an existing element of the Beacon frame, or a new element can be created in the Beacon frame.
  • the field may also be placed in the SIG field of the Presentation Protocol Data Unit (PPDU) frame carrying the object layer of the Beacon frame.
  • PPDU Presentation Protocol Data Unit
  • the "HE Support GI” field is placed directly in the "HE Capabilities” element, and the "HE Capabilities” information element contains an AP that is used to describe an AP that supports a certain WLAN scheme. Select the ability field.
  • the "HE Support GI” field is placed in the "HE Capabilities” element, for example, as shown in Figure 6.
  • the "HE Support GI” field is placed in a field of the "HE Capability” element.
  • the "HE Capability” element includes an "HE Capability Information” field. This field is used to indicate the capability information of the AP.
  • the "HE Support GI” field can be placed in the "HE Capability Information” field described above.
  • the new field "HE Support GI” field in the present invention indicates the data GI length supported by the AP.
  • the supported bandwidth is 20 MHz, 40 MHz, 80 MHz or 160 MHz.
  • N 1, 2, 3, ... 32
  • the newly added field includes an indication index value corresponding to each preset bandwidth, where the indication index value represents all data protection supported by the access device under the preset bandwidth.
  • the minimum data protection interval length in the interval length, the preset bandwidth may include 20MHz, 40MHz, 80MHz, and 160MHz, and the specific representation may be, for convenience of description: all supported by different bandwidths shown in the table of FIG. 8
  • the length of the M data GI is arbitrarily selected as the GI length supported by the AP, as shown in FIG. Where N represents a sequence number, the value of N is ⁇ 1, 2, ..., M ⁇ , m represents the number of bits of the indication bit, and N corresponds to the value of the indication bit.
  • min_GI minimum data GI length supported by the AP
  • index value corresponding to min_GI is N
  • min_GI minimum data GI length supported by the AP
  • the indication index value included in the "HE Support GI” field means that the "HE Support GI” field indicates an index value corresponding to min_GI under different bandwidths.
  • the "HE Support GI” field indicates that the index value corresponding to min_GI in different bandwidths means that the "HE Support GI” field carries the sequence number corresponding to the min_GI supported under each bandwidth. For example: the length of the data GI supported in the 20MHz bandwidth is ⁇ 0.8us, 1.2us, 1.6us, 2.0, 2.4us, 2.8, 3.2us ⁇ , assuming that the min_GI supported by the 20MHz bandwidth is 0.8us. Then, the index index value of the 20M serial number is 2. 40 MHz, 80 MHz, and 160 MHz processing reference 20 MHz.
  • the indication index value of the “HE Support GI” field in the Beacon frame is expressed in a binary code format, that is, in the form of an indicator bit.
  • the specific representation is as shown in FIG. 11 , “HE supports GI.
  • the field includes an indication index value for each of the preset bandwidths, and the indication index value GI_Idx is represented by bit information.
  • the specific bit information is shown in FIG.
  • the newly added field includes an indication bit of each preset data protection interval length, where the indication bit is used to indicate whether the access device supports the preset data protection interval length;
  • the lengths of the M data GIs are arbitrarily selected from the length of the data GI shown in FIG. 8 as the preset data GI length, for example, the preset data GI length is ⁇ 0.4us, 0.8us, 1.2us, 1.6us, 2.0us, 2.4us, 2.8us, 3.2us ⁇ .
  • the "HE Support GI” field indicates whether the AP supports the preset data GI length by using an indication bit, and the "HE Support GI” field may use an indication bit of a single bit to indicate each of the preset data GI lengths. Length, each bit information bit indicates a data GI length, and the "HE Support GI” field is represented as shown in FIG. 13, one bit indicating a data GI length. The specific bit information indication is as shown in FIG.
  • the newly added field includes an indication bit of each preset data protection interval length in each preset bandwidth, where the indication bit is used to indicate whether the access device is The preset data protection interval length in the preset bandwidth is supported.
  • the "HE Support GI” field indicates that the supported data GI length under each bandwidth means that the "HE Support GI” field uses a single bit indication bit to indicate the data GI length supported by the AP, that is, each bit indicates support under different bandwidths respectively.
  • the data GI length, the representation of the "HE Support GI” field is shown in Figure 16.
  • the specific bit information is shown in Figure 17.
  • the access device broadcasts the constructed beacon frame.
  • the specific broadcast method may be to encapsulate the beacon frame and encapsulate the PPDU format for broadcast.
  • the PPDU format may be encapsulated in multiple manners, for example, according to the existing
  • the standard 802.11ac is encapsulated as PPDU1. It can also be re-packaged according to the new generation standard HEW to encapsulate the beacon frame into PPDU2.
  • the specific creation method please refer to the description of Figure 3 to support the terminal of the new generation standard HEW. That is, the parsing PPDU2 can be identified.
  • the access device AP needs to broadcast the encapsulated PPDU1 and PPDU2,
  • the broadcast mode of the PPDU 1 may broadcast the PPDU 1 in a preset period according to the existing standard.
  • an operation field may be added in the PPDU 1, and the operation field indicates the broadcast time of the PPDU 2, and the broadcast time indicated in the operation field is broadcasted. PPDU2.
  • the STA1 After receiving the beacon frame encapsulated in the PPDU1 format, the STA1 accesses the network according to the existing 802.11ac standard, and after detecting the PPDU1 and/or the PPDU2, the STA2 parses the Beacon frame of the beacon frame and analyzes each Beacon frame.
  • the capability element and the "HE support GI" field in the parsing capability element obtain the data GI length supported by the AP, and the STA2 obtains the available data GI length when communicating with the AP according to the length of the support data GI, and the available data GI length refers to the AP supported The length of the data GI in the data GI length that matches the data GI length supported by STA2.
  • the length of the data GI supported by STA2 is ⁇ 0.8us, 1.6us, 2.4us, 3.2us ⁇
  • the length of the data GI supported by the AP is ⁇ 0.4us, 0.8us, 1.6us, 2.0us, 2.4us, 3.2us ⁇ .
  • the data GI length supported by both AP and STA2 is ⁇ 0.8us, 1.6us, 2.4us, 3.2us ⁇ , and ⁇ 0.8us, 1.6us, 2.4us, 3.2us ⁇ is the available data GI length.
  • the STA2 communicates with the AP by using the optional data GI length. Specifically, STA2 can select a data GI length from the available data GI length to perform data communication with the AP according to the channel condition.
  • the processor is further configured to encapsulate the beacon frame into a first standard protocol data unit and a second standard protocol data unit, respectively;
  • the transceiver is further configured to broadcast the beacon frame encapsulated as the first standard protocol data unit and the beacon frame encapsulated as the second standard protocol data unit.
  • the first standard or the second standard is a different WIFI solution, and may be an existing WIFI standard solution such as 802.11ac, or a new generation standard solution HEW that the current standard group is studying, or other similar WIFI solutions.
  • the access device AP When the access device AP encapsulates the beacon frame into the PPDU format, it needs to be encapsulated into two PPDU formats, which are the first standard protocol data unit PPDU1 and the second standard protocol data unit PPDU2, respectively.
  • PPDU1 is encapsulated according to the first standard
  • PPDU2 is encapsulated according to the second standard.
  • the access device broadcasts a beacon frame encapsulated as PPDU1 and a beacon frame encapsulated as PPDU2.
  • the specific broadcast mode may be that the broadcast of the PPDU1 is broadcasted according to a preset period, and the broadcast of the PPDU2 may specify a broadcast time. However, it is necessary to add an operation field to PPDU1 and indicate the transmission time of PPDU2.
  • the processor is further configured to obtain a maximum data protection interval length of the data protection interval length supported by the access device in the first standard, and determine the length of the first candidate data protection interval;
  • the processor is further configured to obtain a maximum data protection interval length of the data protection interval length supported by the access device in the second standard, and determine the length of the second candidate data protection interval;
  • the processor is further configured to encapsulate the beacon frame into the first standard protocol data unit and the according to the first candidate data protection interval length and the second candidate data protection interval length respectively Second standard protocol data unit.
  • the AP supports a set of data GI lengths in the first standard and the second standard, respectively.
  • the first candidate data GI length refers to a maximum data GI length in a group of GIs supported by the AP in the first standard. For example, assuming that the data GI length supported by the AP in the first standard is ⁇ 0.4us, 0.8us ⁇ , the first candidate data GI length refers to a data GI length of length 0.8us.
  • the AP also supports a set of data GI lengths in the second standard, where the second candidate data guard interval length refers to a maximum data GI length in a group of GIs supported by the AP in the second standard.
  • the second candidate data GI length refers to the data GI length of 3.2us. .
  • STA supporting different standards in a network is more diverse, there are multiple types of STAs, and different types of STAs support different standards, but STAs supporting different standards may exist between STAs. Compatible, but only forward compatible, not backward compatible. For example, STAs that support HEW are compatible with STAs that support the 802.11ac standard, but STAs that support the 802.11ac standard cannot support STAs of the HEW standard.
  • the candidate data GI length may be correspondingly determined, and the candidate data is The number of GI lengths corresponds to 3, 4 or more.
  • GI1 and GI2 are denoted in terms of a second standard (e.g., current HEW standard scheme), and the alternative data GI lengths are denoted GI1 and GI2.
  • the access device encapsulates the beacon frame into a first standard protocol data unit PPDU1 and a second standard protocol data unit PPDU2 according to the first candidate data protection interval length GI1 and the second candidate data protection interval length GI2,
  • the constructed PPDU1 and PPDU2 must conform to the PPDU format in their respective standards.
  • the format of PPDU2 and PPDU2 are described below.
  • the PPDU1 format includes a preamble and bearer data, where the bearer data includes a beacon frame, and the preamble GI length and the data GI length are GI1 in the PPDU1 format, as shown in FIG. 18.
  • the purpose of the AP to send PPDU1 is to enable STA1 that supports the first standard to detect the network.
  • the first standard can be the 802.11ac standard.
  • the second standard may be the HEW standard.
  • the PPDU2 format has various design methods, which are not limited herein. The following three optional PPDU2 format designs are listed:
  • the PPDU 2 includes a legacy preamble, an efficient WLAN preamble, and bearer data, as shown in FIG. 19, wherein a combination of L-STF, L-LTF, and L-SIG is called a legacy.
  • the combination of preamble, HE-SIG, HE-STF, and other possible fields is called the HEW preamble.
  • the GI length of the conventional preamble, the GI length of the HEW preamble, and the GI length of the bearer data are both GI2.
  • the AP sends the PPDU2 in order to allow the STA2 supporting the second standard to detect the network. It should be noted that STA2 can also detect the PPDU1 and process it.
  • the explanation of each field in Fig. 19 is as shown in Fig. 20.
  • the format of the PPDU2 includes a traditional preamble, an efficient wireless local area network preamble, and bearer data, where the GI length of the traditional preamble is GI1, and the GI of the HEW preamble is used.
  • the length of the GI with the length and bearer data is GI2.
  • the AP sends the PPDU2 in order to allow the STA2 supporting the second standard to detect the network.
  • FIG. 20 shows that the traditional preamble length of the PPDU2 format is 80 us in the first alternative embodiment, and the conventional preamble of the PPDU2 format is 20us in the second alternative embodiment, in the remaining fields. With the same length, the transmission overhead can be reduced by 60us when using the second alternative implementation.
  • the explanation of each field in Fig. 21 is as shown in Fig. 22.
  • the format of the PPDU 2 is as shown in FIG. 23, and the PPDU 2 includes an efficient wireless local area network preamble and bearer data.
  • the explanation of each field in Fig. 23 is as shown in Fig. 24. Its The GI length of the HEW preamble and the GI length of the bearer data are both GI2, and the AP sends the PPDU2 in order to enable the STA2 supporting the second standard to detect the network.
  • the traditional preamble is removed from the PPDU format in the third alternative embodiment. Therefore, in the case where the remaining fields are the same length, the transmission overhead is reduced by 80 us compared to the PPDU format in the first alternative embodiment.
  • the processor is further configured to add, in the first standard protocol data unit, an operation field for indicating a sending time of the second standard protocol data unit;
  • the transceiver is further configured to broadcast the first standard protocol data unit including the operation field in a preset period;
  • the transceiver is further configured to broadcast the second standard protocol data unit at a transmission time indicated by the operation field.
  • the AP sends the constructed PPDU1 and PPDU2.
  • the PPDU1 is constructed according to the 802.11ac standard.
  • the transmission period of the PPDU1 specified in the 802.11ac standard is T1, and the time at which the AP sends the PPDU2 can be arbitrarily specified.
  • the AP alternately sends PPDU1 and PPDU2; and the operation field can also be added to the PPDU1.
  • the operation field is used to indicate the transmission time of PPDU2. There are various indication ways for how the operation field indicates the transmission time of PPDU2. Only two of them are listed below.
  • the access device broadcasts the PPDU1 including the operation field in a preset period.
  • the PPDU1 may be encapsulated according to the 802.11ac standard. Therefore, the broadcast PPDU1 may also be broadcast according to a preset period in the 802.11ac standard.
  • the access device broadcasts PPDU2 at the sending time indicated by the operation field, and when receiving the PPDU1, the terminal may learn the sending time of the PPDU2 according to the operation field, and receive the PPDU2 at the learned sending time. .
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the added field represents multiple data protection interval lengths supported by the access device, and the access device broadcasts the configured beacon frame.
  • the terminal selects an available guard interval length that matches the length of the data protection interval supported by the terminal from the beacon frame broadcasted by the access device, and communicates with the access device by using the available guard interval length.
  • a plurality of data protection interval lengths supported by the access device may be encapsulated into a new field of the beacon frame, and the access device and the terminal are successfully implemented. Data communication.
  • FIG. 31 is a schematic structural diagram of another terminal provided by the present invention.
  • the terminal 40 of FIG. 31 can be used to implement the steps and methods in the foregoing method embodiments.
  • terminal 40 includes a processor 400, a transceiver 401, a memory 402, an antenna 403, and a bus 404.
  • Processor 400 controls the operation of terminal 40 and can be used to process signals.
  • Memory 402 can include read only memory and random access memory and provides instructions and data to processor 400.
  • Transceiver 401 can be coupled to antenna 403.
  • the various components of terminal 40 are coupled together by a bus system 404, which in addition to the data bus includes a power bus, a control bus, and a status signal bus.
  • bus system 404 which in addition to the data bus includes a power bus, a control bus, and a status signal bus.
  • various buses are labeled as bus system 404 in the figure.
  • the terminal 40 may be STA1, STA2, and STA3 shown in FIG. 1.
  • the transceiver is configured to acquire a beacon frame broadcast by the access device, where the beacon frame includes a new field, where the newly added field represents a plurality of data protection interval lengths supported by the access device;
  • the processor is configured to select, from a plurality of data protection interval lengths supported by the access device The length of the available guard interval matched by the data protection interval length supported by the terminal;
  • the transceiver is configured to perform data communication with the access device using the available guard interval length.
  • the terminal STA obtains a beacon frame broadcasted by the access device, where the beacon frame may be a Beacon frame, and the beacon frame includes a new field, and the newly added field represents multiple data GI lengths supported by the access device.
  • the STA processing flow corresponds to the foregoing access device AP processing flow.
  • the AP side encapsulates the Beacon frame with the first standard protocol data unit PPDU1 and the second standard protocol data unit PPDU2.
  • the first standard may be the 802.11ac standard
  • the second standard may be the HEW standard.
  • STA1 supporting the first standard and STA2 supporting the second standard exist in the network, STA1 can perform normal detection processing only on PPDU1.
  • For the detection processing method refer to the 802.11ac standard scheme, which is not described here.
  • the STA processing procedure described herein refers to the processing flow of the aforementioned STA2.
  • the AP transmits PPDU1 in a preset period, and the PPDU1 includes an operation field for indicating the transmission time of the PPDU2, and the operation field indicates the transmission time of the PPDU2.
  • the STA obtains the Beacon frame method broadcast by the AP, and there are three optional implementation manners:
  • the STA acquires the PPDU1 broadcast by the AP, and the STA processes the PPDU1, parses the Beacon frame from the PPDU1, and the STA determines the data communication between the subsequent STA and the AP according to the preamble of the PPDU1.
  • the preamble length for example, the preamble of PPDU1 is GI1, and the preamble of the STA setting subsequent data communication is GI1.
  • the STA obtains the PPDU2 broadcast by the AP, and the STA processes the PPDU2, and parses the Beacon frame from the PPDU2, and the STA determines the data communication between the subsequent STA and the AP according to the preamble of the PPDU2.
  • the preamble length for example, the preamble of PPDU2 is GI2, and the preamble of the STA setting subsequent data communication is GI2.
  • the STA receives the PPDU1, and then obtains the sending time of the next PPDU2 from the PPDU1 by parsing the “HE Operation” field. For example: Suppose the "HE Operation” field uses one bit to indicate whether there is PPDU2 in the next cycle. If the "HE Operation” field indicates 0, it indicates that the STA needs to detect PPDU2 on the next cycle; if the "HE Operation” field indicates bit 1, it indicates that the STA does not need to detect PPDU2 on the next cycle. The STA parses out the Beacon frame from the detected PPDU2.
  • the STA determines the preamble length of the data communication between the STA and the AP according to the preamble of the PPDU2. For example, if the preamble of the PPDU2 is GI2, the STA sets the subsequent data communication.
  • the preamble is GI2.
  • the terminal STA obtains the Beacon frame of the beacon frame and analyzes the specific capability of the Beacon frame.
  • the STA detects the capability elements of the Beacon frame and parses the HE support GI field to obtain the length of the data GI supported by the AP.
  • the data GI length supported by itself and the data GI length supported by the acquired AP set the available data GI length. For example, assuming that the data GI length indicated by the "HE Support GI" field information is ⁇ 0.8us, 1.6us, 2.4us ⁇ , the length of the data GI supported by the AP is ⁇ 0.8us, 1.6us, 2.4us ⁇ .
  • the length of the GI supported by the STA is ⁇ 0.4us, 0.8us, 1.6us, 2.4us, 3.2us ⁇ .
  • the length of the data GI supported by both AP and STA2 is ⁇ 0.8us, 1.6us, ⁇ , at this time ⁇ 0.8us, 1.6us ⁇ is the length of the available data GI as described.
  • a PGI is constructed by selecting a data GI length from the available data GI length according to channel conditions.
  • the STA may use the available data GI length to perform data communication with the AP. Specifically, in the communication between the subsequent STA and the AP, the STA may be from the available data GI length according to the channel condition. Select a data GI length to construct a PPDU.
  • the STA generates an association request frame according to the available data GI length, and sends the association request frame to the AP.
  • the AP analyzes the association request frame, and returns the association response frame to the STA if the STA is allowed to access the network.
  • the STA parses the STA. At this time, the STA establishes an association with the AP, and the subsequent AP and the STA can perform data communication to transmit data.
  • the transceiver is further configured to acquire the first standard protocol data unit that is broadcast by the access device, and parse the beacon frame from the first standard protocol data unit; or
  • the transceiver is further configured to acquire the second standard protocol data unit that is broadcast by the access device, and parse the beacon frame from the second standard protocol data unit; or
  • the transceiver is further configured to acquire the first standard protocol data unit that is broadcast by the access device, and determine, by using an operation field in the first standard protocol data unit, a sending time of the second standard protocol data unit, And acquiring the second standard protocol data unit according to the sending time, and parsing the beacon frame from the second standard protocol data unit.
  • the access device constructs a beacon frame, where the beacon frame includes a new field, where the added field represents multiple data protection interval lengths supported by the access device, and the access device broadcasts the configured beacon frame.
  • the terminal selects the length of the data protection interval supported by the terminal from the beacon frame broadcasted by the access device.
  • the available guard interval length is configured and communicated with the access device using the available guard interval length.
  • a plurality of data protection interval lengths supported by the access device may be encapsulated into a new field of the beacon frame, and the access device and the terminal are successfully implemented. Data communication.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

一种数据通信方法及相关装置，该数据通信方法包括：接入设备构造信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；所述接入设备广播所述信标帧，以使终端从所述信标帧中选择与所述终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用所述可用保护间隔长度与所述接入设备进行数据通信。采用本发明可在接入设备支持多种数据保护间隔长度时，实现接入设备与终端之间的数据通信。

Description

一种数据通信方法及相关装置 技术领域
本发明涉及数据通信技术领域，尤其涉及一种数据通信方法及相关装置。
背景技术
随着通信相关技术的发展，基于IEEE 802.11标准的无线局域网络(Wireless Local Area Networks，WLAN)技术得到了广泛的应用。目前WLAN的多种主流标准(例如：802.11n、802.11ac)中，引入保护间隔(Guard Interval，GI)来消除由于信道的延迟扩展而带来的码间干扰。在终端与接入设备通信的过程中，终端需要选择合适的保护间隔长度，以便在最大程度上消除码间干扰。在802.11ac标准中，所使用的GI长度为0.8us的。在接入设备与终端数据通信过程中，AP与STA使用0.8us的前导码GI长度与0.8us的数据GI长度
IEEE于2013年5月正式启动了下一代WLAN标准，高效无线局域网(High Efficiency WLAN，HEW)，HEW的标准将被称作802.11ax。HEW标准工作中提出在GI长度方面给出更多选择，包括：3.2us、2.4、1.6us、1.2us、0.8us、0.4us等GI长度。HEW方案中在多个可选GI长度的情况下，目前还没有为HEW的终端与接入设备之间进行数据通信设置GI长度的方法。
发明内容
本发明实施例提供了一种数据通信方法及相关装置，可在接入设备支持多种数据保护间隔长度时，实现接入设备与终端之间的数据通信。
本发明第一方面提供一种数据通信方法，可包括：
接入设备构造信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
所述接入设备广播所述信标帧，以使终端从所述信标帧中选择与所述终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用所述可用保护间隔长度与所述接入设备进行数据通信。
基于第一方面，在第一种可行的实施方式中，所述信标帧包括至少一个元素，所述至少一个元素中的特定元素携带所述新增字段，所述特定元素为已有 元素或者新增元素。
基于第一方面第一种可行的实施方式，在第二种可行的实施方式中，所述新增字段包括每一种预设带宽对应的指示索引值，所述指示索引值表征所述接入设备在该预设带宽下所支持的所有数据保护间隔长度中的最小数据保护间隔长度；或者，
所述新增字段包括每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设数据保护间隔长度；或者，
所述新增字段包括每一种预设带宽下每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设带宽下的该预设数据保护间隔长度。
基于第一方面，在第三种可行的实施方式中，所述接入设备构造信标帧之后，还包括：
所述接入设备分别将所述信标帧封装为第一标准协议数据单元和第二标准协议数据单元；
所述接入设备广播所述信标帧，包括：
所述接入设备广播所述封装为所述第一标准协议数据单元的信标帧和所述封装为所述第二标准协议数据单元的信标帧。
基于第一方面第三种可行的实施方式，在第四种可行的实施方式中，所述接入设备支持的多种数据保护间隔长度中包括所述接入设备在第一标准中所支持的数据保护间隔长度和所述接入设备在第二标准中所支持的数据保护间隔长度；
所述接入设备分别将所述信标帧封装为第一标准协议数据单元和第二标准协议数据单元，包括：
所述接入设备获取所述接入设备在第一标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第一备选数据保护间隔长度；
所述接入设备获取所述接入设备在第二标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第二备选数据保护间隔长度；
所述接入设备根据所述第一备选数据保护间隔长度和所述第二备选数据保护间隔长度，分别将所述信标帧封装为所述第一标准协议数据单元和所述第 二标准协议数据单元。
基于第一方面第四种可行的实施方式，在第五种可行的实施方式中，所述第一标准协议数据单元包括前导码和承载数据，所述承载数据包括所述信标帧，所述前导码保护间隔长度和所述承载数据的保护间隔长度为所述第一备选数据保护间隔长度。
基于第一方面第四种可行的实施方式，在第六种可行的实施方式中，所述第二标准协议数据单元包括传统前导码、高效无线局域网前导码和承载数据，所述传统前导码的保护间隔长度、所述高效无线局域网前导码的保护间隔长度以及所述承载数据的保护间隔长度均为所述第二备选数据保护间隔长度；或者，
所述第二标准协议数据单元包括传统前导码、高效无线局域网前导码和承载数据，所述传统前导码的保护间隔长度为所述第一备选数据保护间隔长度，所述高效无线局域网前导码和所述承载数据的保护间隔长度为所述第二备选数据保护间隔长度；或者，
所述第二标准协议数据单元包括高效无线局域网前导码和承载数据，所述高效无线局域网前导码的保护间隔长度和所述承载数据的保护间隔长度均为所述第二备选数据保护间隔长度。
基于第一方面第四种可行的实施方式，在第七种可行的实施方式中，所述接入设备广播所述封装为所述第一标准协议数据单元的信标帧和所述封装为所述第二标准协议数据单元的信标帧之前，还包括：
所述接入设备在所述第一标准协议数据单元中增加用于指示所述第二标准协议数据单元发送时间的操作字段；
所述接入设备广播所述封装为所述第一标准协议数据单元的信标帧和所述封装为所述第二标准协议数据单元的信标帧，包括：
所述接入设备以预设周期广播所述包括所述操作字段的第一标准协议数据单元；
所述接入设备在所述操作字段指示的发送时间广播所述第二标准协议数据单元。
本发明第二方面提供一种数据通信方法，可包括：
终端获取接入设备广播的信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
所述终端从所述接入设备支持的多种数据保护间隔长度中选择与所述终端支持的数据保护间隔长度匹配的可用保护间隔长度；
所述终端利用所述可用保护间隔长度与所述接入设备进行数据通信。
基于第二方面，在第一种可行的实施方式中，所述信标帧以第一标准协议数据单元进行封装和第二标准协议数据单元进行封装，所述接入设备以预设周期发送所述第一标准协议数据单元，所述第一标准协议数据单元包括用于指示所述第二标准协议数据单元发送时间的操作字段。
基于第二方面第一种可行的实施方式，在第二种可行的实施方式中，所述终端获取接入设备广播的信标帧，包括：
所述终端获取所述接入设备广播的所述第一标准协议数据单元，并从所述第一标准协议数据单元中解析出所述信标帧；或者，
所述终端获取所述接入设备广播的所述第二标准协议数据单元，并从所述第二标准协议数据单元中解析出所述信标帧；或者，
所述终端获取所述接入设备广播的所述第一标准协议数据单元，从所述第一标准协议数据单元中的操作字段确定所述第二标准协议数据单元的发送时间，并根据所述发送时间获取所述第二标准协议数据单元，从所述第二标准协议数据单元中解析出所述信标帧。
本发明第三方面提供一种接入设备，包括:
构造模块，用于构造信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
收发模块，用于广播所述信标帧，以及与终端进行数据通信。
基于第三方面，在第一种可行的实施方式中，所述信标帧包括至少一个元素，所述至少一个元素中的特定元素携带所述新增字段，所述特定元素为已有元素或者新增元素。
基于第三方面第一种可行的实施方式，在第二种可行的实施方式中，所述新增字段包括每一种预设带宽对应的指示索引值，所述指示索引值表征所述接入设备在该预设带宽下所支持的所有数据保护间隔长度中的最小数据保护间 隔长度；或者，
所述新增字段包括每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设数据保护间隔长度；或者，
所述新增字段包括每一种预设带宽下每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设带宽下的该预设数据保护间隔长度。
基于第三方面，在第三种可行的实施方式中，所述接入设备还包括：
封装模块，用于分别将所述信标帧封装为第一标准协议数据单元和第二标准协议数据单元；
所述收发模块具体用于广播所述封装为所述第一标准协议数据单元的信标帧和所述封装为所述第二标准协议数据单元的信标帧。
基于第三方面第三种可行的实施方式，在第四种可行的实施方式中，所述接入设备支持的多种数据保护间隔长度中包括所述接入设备在第一标准中所支持的数据保护间隔长度和所述接入设备在第二标准中所支持的数据保护间隔长度；所述封装模块包括：
第一获取单元，用于获取所述接入设备在第一标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第一备选数据保护间隔长度；
第二获取单元，用于获取所述接入设备在第二标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第二备选数据保护间隔长度；
封装单元，用于根据所述第一备选数据保护间隔长度和所述第二备选数据保护间隔长度，分别将所述信标帧封装为所述第一标准协议数据单元和所述第二标准协议数据单元。
基于第三方面第四种可行的实施方式，在第五种可行的实施方式中，所述第一标准协议数据单元包括前导码和承载数据，所述承载数据包括所述信标帧，所述前导码保护间隔长度和所述承载数据的保护间隔长度为所述第一备选数据保护间隔长度。
基于第三方面第四种可行的实施方式，在第六种可行的实施方式中，所述第二标准协议数据单元包括传统前导码、高效无线局域网前导码和承载数据，所述传统前导码的保护间隔长度、所述高效无线局域网前导码的保护间隔长度 以及所述承载数据的保护间隔长度均为所述第二备选数据保护间隔长度；或者，
所述第二标准协议数据单元包括传统前导码、高效无线局域网前导码和承载数据，所述传统前导码的保护间隔长度为所述第一备选数据保护间隔长度，所述高效无线局域网前导码和所述承载数据的保护间隔长度为所述第二备选数据保护间隔长度；或者，
所述第二标准协议数据单元包括高效无线局域网前导码和承载数据，所述高效无线局域网前导码的保护间隔长度和所述承载数据的保护间隔长度均为所述第二备选数据保护间隔长度。
基于第三方面第四种可行的实施方式，在第七种可行的实施方式中，所述接入设备还包括：
处理模块，用于在所述第一标准协议数据单元中增加用于指示所述第二标准协议数据单元发送时间的操作字段；
所述收发模块具体用于以预设周期广播所述包括所述操作字段的第一标准协议数据单元；
所述收发模块还用于在所述操作字段指示的发送时间广播所述第二标准协议数据单元。
本发明第四方面提供一种终端，包括：
收发模块，用于获取接入设备广播的信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
选择模块，用于从所述接入设备支持的多种数据保护间隔长度中选择与所述终端支持的数据保护间隔长度匹配的可用保护间隔长度；
所述收发模块还用于利用所述可用保护间隔长度与所述接入设备进行数据通信。
基于第四方面，在第一种可行的实施方式中，所述信标帧以第一标准协议数据单元进行封装和第二标准协议数据单元进行封装，所述接入设备以预设周期发送所述第一标准协议数据单元，所述第一标准协议数据单元包括用于指示所述第二标准协议数据单元发送时间的操作字段。
基于第四方面第一种可行的实施方式，在第二种可行的实施方式中，所述 收发模块具体用于获取所述接入设备广播的所述第一标准协议数据单元，并从所述第一标准协议数据单元中解析出所述信标帧；或者，
所述收发模块具体用于获取所述接入设备广播的所述第二标准协议数据单元，并从所述第二标准协议数据单元中解析出所述信标帧；或者，
所述收发模块具体用于获取所述接入设备广播的所述第一标准协议数据单元，从所述第一标准协议数据单元中的操作字段确定所述第二标准协议数据单元的发送时间，并根据所述发送时间获取所述第二标准协议数据单元，从所述第二标准协议数据单元中解析出所述信标帧。
本发明实施例中，接入设备构造信标帧，该信标帧包括新增字段，该新增字段表征接入设备支持的多种数据保护间隔长度，接入设备广播所构造的信标帧，终端从接入设备所广播的信标帧中选择与终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用该可用保护间隔长度与接入设备进行通信。本实施方式中，在提出多种数据保护间隔长度的标准中，可将接入设备支持的多种数据保护间隔长度封装进信标帧的新增字段中，成功实现接入设备与终端之间的数据通信。
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为发明提供的一种数据通信方法的应用场景图；
图2为本发明提供的一种数据通信方法的流程示意图；
图3为本发明提供的另一种数据通信方法的流程示意图；
图4为本发明提供的又一种数据通信方法的流程示意图；
图5为本发明提供的又一种数据通信方法的流程示意图；
图6为本发明提供的一种新增元素的结构示意图；
图7为本发明提供的另一种新增元素的结构示意图；
图8为本发明提供的一种在HEW标准中AP支持的数据GI长度表格；
图9为本发明提供的另一种在HEW标准中AP支持的数据GI长度表格；
图10为本发明提供的一种指示索引值对应表格；
图11为本发明提供的一种新增字段的结构示意图；
图12为本发明提供的一种对新增字段解释说明的表格；
图13为本发明提供的另一种新增字段的结构示意图；
图14为本发明提供的另一种对新增字段解释说明的表格；
图15为本发明提供的又一种在HEW标准中AP支持的数据GI长度表格；
图16为本发明提供的又一种新增字段的结构示意图；
图17为本发明提供的又一种对新增字段解释说明的表格；
图18为在802.11ac标准中PPDU1的封装格式；
图19为本发明提供的一种PPDU2的封装格式；
图20为本发明提供的一种对PPDU2中各个字段的解释说明表格；
图21为本发明提供的另一种PPDU2的封装格式；
图22为本发明提供的另一种对PPDU2中各个字段的解释说明表格；
图23为本发明提供的又一种PPDU2的封装格式；
图24为本发明提供又一种对PPDU2中各个字段的解释说明表格；
图25为本发明提供的一种PPDU1和PPDU2的广播方式；
图26为本发明提供的另一种PPDU1和PPDU2的广播方式；
图27为本发明提供的一种接入设备的结构示意图；
图28为本发明提供的一种封装模块的结构示意图；
图29为本发明提供的一种终端的结构示意图；
图30为本发明提供的另一种接入设备的结构示意图；
图31为本发明提供的另一种终端的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明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发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
接入设备可以是接入点(简称：AP，英文：Access Point)，也称之为无线访问接入点或热点等。AP是移动用户进入有线网络的接入点，主要部署于家庭、大楼内部以及园区内部，典型覆盖半径为几十米至上百米，当然，也可以部署于户外。AP相当于一个连接有线网和无线网的桥梁，其主要作用是将各个无线网络客户端连接到一起，然后将无线网络接入以太网。目前AP主要采用的标准为IEEE(英文：Institute of Electrical and Electronics Engineers，中文：电气和电子工程师协会)802.11系列。具体地，AP可以是带有WiFi芯片的终端设备或者网络设备。可选地，AP可以为支持802.11ax制式的设备，进一步可选地，该AP可以为支持802.11ac、802.11n、802.11g、802.11b及802.11a等多种WLAN(英文：Wireless Local Area Network,中文：无线局域网)制式的设备。
终端可以是无线通讯芯片、无线传感器或无线通信终端。例如：支持无线保真(英文:Wireless Fidelity，简称:WiFi)通讯功能的移动电话、支持WiFi通讯功能的平板电脑、支持WiFi通讯功能的机顶盒和支持WiFi通讯功能的计算机。可选地，终端可以支持802.11ax制式，进一步可选地，终端支持802.11ac、802.11n、802.11g、802.11b及802.11a等多种WLAN制式。
现有技术中，例如在802.11ac标准中，AP与STA之间进行数据通信的过程中，所使用的数据GI长度为0.8us，在HEW标准中，提出了在数据GI长度方面更多的选择，包括：0.4us、0.8us、1.2us、1.6us、2.4us、3.2us等数据长度GI，现有技术中固化的数据GI长度就无法满足新的HEW标准中AP与STA之间的数据通信，如图1所示，在AP同时支持HEW标准的STA2、STA3和802.11ac标准的STA1，当AP与STA之间使用0.8us的数据GI长度时，由于STA1和STA2在0.8us的覆盖范围内，因此可以与AP之间进行数 据通信，但是STA3在0.8us之外，因此无法与AP之间进行数据通信。
本发明实施例可以应用于图1的应用场景中，AP向所有的STA广播信标帧，该信标帧中携带新增字段，该新增字段用于表征AP所支持的多种数据GI长度，以使终端在接收到AP广播的信标帧时，解析出AP所支持的多种数据GI长度，并选择与终端所支持的数据GI长度中匹配的数据GI长度作为与AP之间进行数据通信时所使用的数据GI长度，因此本发明实施例可以在HEW标准中所提出的多种数据GI长度情况下，成功实现AP与STA之间的数据通信。
请参照图2为本发明实施例提供的一种数据通信方法，如图所示，本实施例的数据通信方法包括步骤S100-S101；
S100，接入设备构造信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
具体实施例中，当前标准组正在研究的新一代标准方案HEW支持的数据GI长度是{0.4us、0.8us、1.6us、2.4us、3.2us}，接入设备可以是无线接入点(Access Point，AP)，AP为了更好的指示数据GI长度信息，本发明在信标帧Beacon帧中添加新增字段，记作“HE支持GI”字段，该新增字段用于表征AP支持的多种GI长度。所述的“HE支持GI”用于AP与STA之间交换各自支持的数据GI长度。下面分别从“HE支持GI”字段的位置、“HE支持GI”字段的格式等方面详细描述。
“HE支持GI”字段可放置在Beacon帧中的任意位置，例如，该字段可以放置在Beacon帧的一个已有元素中，也可以在Beacon帧中创立一个新增元素来放置。除此之外，该字段还可以放在携带该Beacon帧的物层的表示层协议数据单元(Presentation Protocol Data Unit，PPDU)帧的SIG域中。下面考虑新创立一个新增元素来放置“HE支持GI”字段的情况。新创立元素记作HE能力元素。此时，可以采取下面的方式来放置“HE支持GI”字段。
在第一种可选的实施方式中，“HE支持GI”字段直接放置在“HE能力”元素中，“HE能力”信息元素包含用来描述支持某种WLAN方案的AP的可 选能力的字段。“HE支持GI”字段放置在“HE能力”元素中，例如可采用如图6所示的方式放置。
在第二种可选的实施方式中，“HE支持GI”字段放置在“HE能力”元素的一个字段中，如图7所示，“HE能力”元素中包含一个“HE能力信息”字段，该字段用来指示AP的能力信息。可将“HE支持GI”字段放置在上述“HE能力信息”字段中。
本发明中新增字段“HE支持GI”字段指示AP支持的数据GI长度，新一代标准HEW方案中，支持的带宽有20MHz、40MHz、80MHz或160MHz。不同的带宽下数据GI长度有多种，如图8所示。其中AP支持数据GI长度是0.4us的N(N＝1、2、3……32)倍的长度。HE支持GI”的字段的表示方式有很多种，下面分别举例几种表示方式进行说明，需要说明的是，具体的表示方式在此不作限定。
在第一种可选的实施方式中，新增字段包括每一种预设带宽对应的指示索引值，所述指示索引值表征所述接入设备在该预设带宽下所支持的所有数据保护间隔长度中的最小数据保护间隔长度，预设带宽可以包括20MHz、40MHz、80MHz以及160MHz，具体的表示方式可以是，为了描述方便：此处从图8的表中所示的不同带宽支持的所有数据GI长度中任意选择M个数据GI长度作为AP支持的GI长度，如图9所示。其中N表示序号，N的值为{1、2、…、M}，m表示指示位的bit数，N与指示位值一一对应。假设选择了6种数据GI长度，即M＝6。则N＝{1、2、…、6}，m＝3，N与指示位关系如图9所示。为了描述方便，假设AP不支持某些数据GI长度，“-”表示对应带宽下AP不支持该GI长度。
假设AP支持的最小数据GI长度记为min_GI，min_GI对应的索引值是N，并且不同的带宽下都对应有一个min_GI。由图9获得在不同带宽下AP支持的min_GI以及其与序号、指示位的关系如图10所示。
所述“HE支持GI”字段包括的指示索引值是指“HE支持GI”字段指示不同带宽下的min_GI对应的索引值。所述“HE支持GI”字段指示不同带宽下的min_GI对应的索引值是指“HE支持GI”字段携带每种带宽下支持的min_GI对应的序号。举例说明：在20MHz带宽下支持的数据GI长度是{0.8us、 1.2us、1.6us、2.0、2.4us、2.8、3.2us}，假设20MHz带宽支持的min_GI是0.8us。则20M序号的指示索引值是2。40MHz、80MHz以及160MHz处理参考20MHz。具体的，在Beacon帧中“HE支持GI”字段的指示索引值的表示方式是以二进制编码形式存在，即是以指示位的形式存在，具体的表示形式如图11所示，“HE支持GI”字段包括每一种预设带宽下的指示索引值，指示索引值GI_Idx是以比特信息进行表示。具体的比特信息表示如图12所示。
在第二种可选的实施方式中，新增字段包括每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设数据保护间隔长度；在本实施方式中不考虑带宽的影响，从图8所示的数据GI长度中任意选择M个数据GI长度作为预设数据GI长度，例如：预设数据GI长度为{0.4us、0.8us、1.2us、1.6us、2.0us、2.4us、2.8us、3.2us}。
所述“HE支持GI”字段利用指示位指示AP是否支持该预设数据GI长度，“HE支持GI”字段可以使用单个比特的指示位来指示所有预设数据GI长度中的每一种数据GI长度，每一个比特信息位指示一种数据GI长度，“HE支持GI”字段的表示方式如13所示，一个比特位指示一种数据GI长度。具体的比特信息指示如图14所示。
在第三种可选的实施方式中，所述新增字段包括每一种预设带宽下每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设带宽下的该预设数据保护间隔长度。本实施方式从图8所示的不同带宽支持的所有数据GI长度中任意选择M个数据GI长度作为AP支持的数据GI长度，此处M＝5，如图15所示。所述“HE支持GI”字段指示每种带宽下支持的数据GI长度是指“HE支持GI”字段使用单个比特指示位指示AP支持的数据GI长度，即每一个bit分别指示不同带宽下支持的数据GI长度，“HE支持GI”字段的表示形式如图16所示。具体比特信息见图17。
S101，所述接入设备广播所述信标帧，以使终端从所述信标帧中选择与所述终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用所述可用保护间隔长度与所述接入设备进行数据通信。
具体实施例中，接入设备广播所构造的信标帧，具体的广播方法可以是将信标帧进行封装，封装为PPDU格式进行广播，PPDU格式的封装方式可以多 种，例如，可以按照现有标准中的802.11ac进行封装为PPDU1，也可以重新根据新一代标准HEW创立一种封装方式，将信标帧封装为PPDU2，具体的创立方式请参照图3的描述，支持新一代标准HEW的终端即可以识别解析PPDU2。
当广播范围内同时存在支持标准802.11ac的终端STA1和支持新一代标准HEW的终端STA2时，为了能够将STA1和STA2均接入网络，则接入设备AP需要广播所封装的PPDU1和PPDU2，对PPDU1的广播方式可以按照现有标准中，以一定的预设周期广播PPDU1，对于PPDU2的广播可以是在PPDU1中增加操作字段，该操作字段指示PPDU2的广播时间，则在操作字段指示的时间广播PPDU2。
STA1接收到AP广播的封装为PPDU1格式的信标帧后，按照现有的802.11ac标准接入网络，STA2检测PPDU1和/或PPDU2后，解析出信标帧Beacon帧，并分析Beacon帧的各个能力元素，并解析能力元素中“HE支持GI”字段获取AP支持的数据GI长度，STA2根据自身支持数据GI长度来获取与AP通信时的可用数据GI长度，可用数据GI长度指，AP支持的数据GI长度中与STA2支持的数据GI长度中匹配的数据GI长度。例如，STA2支持的数据GI长度为{0.8us、1.6us、2.4us、3.2us}，AP支持的数据GI长度为{0.4us、0.8us、1.6us、2.0us、2.4us、3.2us}，可见AP与STA2都支持的数据GI长度是{0.8us、1.6us、2.4us、3.2us}，此时{0.8us、1.6us、2.4us、3.2us}即所述的可用数据GI长度。后续STA2即利用可选数据GI长度与AP进行数据通信，具体的，STA2可以根据信道状况从可用数据GI长度中选择一种数据GI长度与AP进行数据通信。
本发明实施例中，接入设备构造信标帧，该信标帧包括新增字段，该新增字段表征接入设备支持的多种数据保护间隔长度，接入设备广播所构造的信标帧，终端从接入设备所广播的信标帧中选择与终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用该可用保护间隔长度与接入设备进行通信。本实施方式中，在提出多种数据保护间隔长度的标准中，可将接入设备支持的多种数据保护间隔长度封装进信标帧的新增字段中，成功实现接入设备与终端之 间的数据通信。
请参照图3，为本发明实施例提供的另一种数据通信方法，如图所示，本实施例的数据通信方法包括步骤S200-S202；
S200，接入设备构造信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
S201，所述接入设备分别将所述信标帧封装为第一标准协议数据单元和第二标准协议数据单元；
具体实施例中，考虑在一个网络中同时存在支持第一标准与第二标准的STA的情况。例如，STA1支持第一标准，STA2支持第二标准。上述第一标准或者第二标准为不同的WIFI方案，可以是已有WIFI标准方案例如802.11ac，也可以是当前标准组正在研究的新一代标准方案HEW，还可以是其它类似的WIFI方案。
接入设备AP在将信标帧封装为PPDU格式时，需要封装为两种PPDU格式，分别为第一标准协议数据单元PPDU1和第二标准协议数据单元PPDU2，PPDU1按照第一标准进行封装，PPDU2按照第二标准进行封装。以下对具体的封装方式进行详细介绍，具体包括步骤S20-S22；
S20，所述接入设备获取所述接入设备在第一标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第一备选数据保护间隔长度；
具体实施例中，AP在第一标准与第二标准分别支持一组数据GI长度。所述第一备选数据GI长度指第一标准中AP支持的一组GI中的最大数据GI长度。举例说明，假设AP在第一标准中支持的数据GI长度是{0.4us、0.8us}，那么所述第一备选数据GI长度指长度为0.8us的数据GI长度。
S21，所述接入设备获取所述接入设备在第二标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第二备选数据保护间隔长度；
具体实施例中，AP在第二标准中也支持一组数据GI长度，所述第二备选数据保护间隔长度指第二标准中AP支持的一组GI中的最大数据GI长度。举例说明，假设AP在第二标准中支持的一组数据GI长度为{0.4us、0.8us、1.6 us、2.4us、3.2us}，则第二备选数据GI长度指3.2us的数据GI长度。
需要说明的是，在一个网络中支持不同标准的STA更加多样性的情况下，即是存在多种类型的STA，不同类型的STA所支持的标准不同，但是支持不同标准的STA之间可能存在兼容，但是只能前向兼容，不能后向兼容。例如，支持HEW的STA能够兼容支持802.11ac标准的STA，但支持802.11ac标准的STA不能支持HEW标准的STA。当网络中存在多种类型的STA时，例如网络中多样性的STA支持的不同标准的数量为3、4或者更多，可对应确定所述备选数据GI长度，此时所述备选数据GI长度的数量对应的为3、4或者更多。为便于表述，下面均假设网络中存在两个STA分别支持第一标准(例如802.11ac标准方案)和第二标准(例如当前HEW标准方案)，来描述本发明内容，而所述备选数据GI长度记作GI1与GI2。
S22，所述接入设备根据所述第一备选数据保护间隔长度和所述第二备选数据保护间隔长度，分别将所述信标帧封装为所述第一标准协议数据单元和所述第二标准协议数据单元。
具体实施例中，接入设备根据第一备选数据保护间隔长度GI1和第二备选数据保护间隔长度GI2，将信标帧封装为第一标准协议数据单元PPDU1和第二标准协议数据单元PPDU2，构造得到的PPDU1与PPDU2需符合各自标准中的PPDU格式。下面分别介绍PPDU2与PPDU2的格式。
可选的，PPDU1格式包括前导码和承载数据，该承载数据在包括信标帧，PPDU1格式中前导码GI长度与数据GI长度为GI1，如图18所示。AP发送PPDU1的目的是让支持第一标准的STA1检测到网络。第一标准可以是802.11ac标准。
可选的，第二标准可以是HEW标准，结合HEW标准，PPDU2格式有多种设计方法，在此不作限定，下面列举三种可选的PPDU2格式设计：
在第一种可选的实施方式中，PPDU2包括传统前导码、高效无线局域网前导码和承载数据，如19所示，其中，L-STF、L-LTF与L-SIG的组合称为传统前导码，HE-SIG、HE-STF等其它可能的字段的组合称为HEW前导码。传统前导码的GI长度、HEW前导码的GI长度以及承载数据的GI长度均为GI2。AP发送PPDU2是为了让支持第二标准的STA2检测到网络，需要说明 的是STA2也能够检测到PPDU1，并对其进行处理。图19中各个字段的解释如图20所示。
在第二种可选的实施方式中，如图21所示，PPDU2的格式中包括传统前导码、高效无线局域网前导码和承载数据，其中传统前导码的GI长度为GI1，HEW前导码的GI长度与承载数据的GI长度为GI2。AP发送PPDU2是为了让支持第二标准的STA2检测到网络。由图20得到在第一种可选的实施方式中PPDU2格式的传统前导码长度是80us，由图22得到在第二种可选的实施方式中PPDU2格式的传统前导码是20us，在其余字段长度都一样的情况下，使用第二种可选的实施方式时传输开销可减少60us。图21中各个字段的解释如图22所示。
在第三种可选的实施方式中，PPDU2的格式如图23所示，PPDU2包括高效无线局域网前导码和承载数据。图23中各个字段的解释如图24所示。其中，HEW前导码的GI长度与承载数据的GI长度均为GI2，AP发送PPDU2是为了让支持第二标准的STA2检测到网络。与第一种可选实施方式中PPDU格式相比，第三种可选实施方式中PPDU格式中去除了传统前导码。因此在其余字段长度一样的情况下，与第一种可选实施方式中的PPDU格式相比，传输开销减少80us。
S202，所述接入设备广播所述封装为所述第一标准协议数据单元的信标帧和所述封装为所述第二标准协议数据单元的信标帧。
具体实施例中，接入设备广播封装为PPDU1的信标帧和封装为PPDU2的信标帧，具体的广播方式可以是，对PPDU1的广播按照预设周期进行广播，对PPDU2的广播可以指定广播时间，但是需要在PPDU1里面增加操作字段，并指示PPDU2的发送时间。
本发明实施例中，接入设备构造信标帧，该信标帧包括新增字段，该新增字段表征接入设备支持的多种数据保护间隔长度，接入设备广播所构造的信标帧，终端从接入设备所广播的信标帧中选择与终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用该可用保护间隔长度与接入设备进行通信。本实施方式中，在提出多种数据保护间隔长度的标准中，可将接入设备支持的多 种数据保护间隔长度封装进信标帧的新增字段中，成功实现接入设备与终端之间的数据通信。
请参照图4，为本发明实施例提供的又一种数据通信方法，如图所示，本实施例的数据通信方法包括步骤S300-S304；
S300，接入设备构造信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
S301，所述接入设备分别将所述信标帧封装为第一标准协议数据单元和第二标准协议数据单元；
S302，所述接入设备在所述第一标准协议数据单元中增加用于指示所述第二标准协议数据单元发送时间的操作字段；
具体实施例中，所述AP发送所构造的PPDU1和PPDU2。假设PPDU1是按照802.11ac标准进行构造，在802.11ac标准中规定的PPDU1的发送周期是T1，AP发送PPDU2的时间可以任意指定，例如：AP交替发PPDU1与PPDU2；也可以在PPDU1中增加操作字段进行指示，也可以在PPDU2中增加操作字段进行指示。操作字段用来指示PPDU2的发送时间。对于操作字段如何指示PPDU2的发送时间，可以有多种指示方式，下面仅列出两种。
在第一种可选的实施方式中，HE操作字段只用一个比特，用来指示下一个m*T(例如：m＝2/3)周期是否有PPDU2，其中T为广播PPDU1的预设周期。即如果HE操作字段的值是1，则表示下一个m*T周期有PPDU2；如果HE操作字段的值是0，则表示下一个m*T周期没有PPDU2。如25所示，从左边开始第一个PPDU1中的HE操作字段值为1，则表示在下一个m*T周期有PPDU2；第二个PPDU1中的HE操作字段值为0，则在下一个m*T周期没有PPDU2。
在第二种可选的实施方式中，HE操作字段有两个或者多个比特，记为x个，HE操作字段可以用来指示下一个(n+m*T)(例如：m＝2/3，n是x个比特数表示的自然数)周期是否有PPDU2。即如果HE操作字段的值是n，则表示在下一个(n+m*T)周期有PPDU2。如图26所示，从左边开始的第一个PPDU1的HE操作字段的值是1，表示下一个m*T周期有PPDU2；第二个PPDU1的HE操作字段的值 是2，表示下两个m*T周期有PPDU2。
S303，所述接入设备以预设周期广播所述包括所述操作字段的第一标准协议数据单元；
具体实施例中，接入设备以一定的预设周期广播包括操作字段的PPDU1，PPDU1可以是按照802.11ac标准进行封装的，因此广播PPDU1也可以按照802.11ac标准中的预设周期进行广播。
S304，所述接入设备在所述操作字段指示的发送时间广播所述第二标准协议数据单元。
具体实施例中，如图25或26所示，接入设备在操作字段指示的发送时间广播PPDU2，终端在接收到PPDU1时可以根据操作字段获知PPDU2的发送时间，并在所获知的发送时间接收PPDU2。
本发明实施例中，接入设备构造信标帧，该信标帧包括新增字段，该新增字段表征接入设备支持的多种数据保护间隔长度，接入设备广播所构造的信标帧，终端从接入设备所广播的信标帧中选择与终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用该可用保护间隔长度与接入设备进行通信。本实施方式中，在提出多种数据保护间隔长度的标准中，可将接入设备支持的多种数据保护间隔长度封装进信标帧的新增字段中，成功实现接入设备与终端之间的数据通信。
请参照图5，为本发明实施例提供的又一种数据通信方法，如图所示，本实施例数据通信方法包括步骤S400-S402；
S400，终端获取接入设备广播的信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
具体实施例中，终端STA获取接入设备所广播的信标帧，信标帧可以是Beacon帧，信标帧中包括新增字段，新增字段表征接入设备支持的多种数据GI长度。STA处理流程与上述接入设备AP处理流程对应。AP侧将Beacon帧以第一标准协议数据单元PPDU1和第二标准协议数据单元PPDU2进行封装，第一标准可以是802.11ac标准，第二标准可以是HEW标准。本实施方式中，当网络 中存在支持第一标准的STA1和支持第二标准的STA2，STA1仅能对PPDU1进行正常的检测处理。检测处理的方法可参见802.11ac标准方案，这里不再赘述。此处描述的STA处理流程指前述STA2的处理流程。
AP以预设周期发送PPDU1，PPDU1包括用于指示PPDU2发送时间的操作字段，该操作字段指示PPDU2的发送时间。具体的，STA获取AP广播的Beacon帧方法可以有三种可选的实施方式：
在第一种可选的实施方式中，STA获取的是AP广播的PPDU1，则STA处理PPDU1，从PPDU1中解析出Beacon帧，同时STA根据PPDU1的前导码确定后续STA与AP之间进行数据通信的前导码长度，例如PPDU1的前导码为GI1，则STA设置后续数据通信的前导码为GI1。
在第二种可选的实施方式中，STA获取的是AP广播的PPDU2，则STA处理PPDU2，从PPDU2里面解析出Beacon帧，同时STA根据PPDU2的前导码确定后续STA与AP之间进行数据通信的前导码长度，例如PPDU2的前导码为GI2，则STA设置后续数据通信的前导码为GI2。
在第三种可选的实施方式中，STA接收到PPDU1，则从PPDU1中通过解析“HE操作”字段获取下一个PPDU2的发送时间。举例说明：假设“HE操作”字段使用一个比特指示下一个周期是否有PPDU2。如果“HE操作”字段指示0，则表示STA需要在下一个周期上检测PPDU2；如果“HE操作”字段指示位1，则表示STA不需要在下一个周期上检测PPDU2。STA从检测到的PPDU2里面解析出Beacon帧。同时STA根据PPDU2的前导码确定后续STA与AP之间进行数据通信的前导码长度，例如PPDU2的前导码为GI2，则STA设置后续数据通信的前导码为GI2。
S401，所述终端从所述接入设备支持的多种数据保护间隔长度中选择与所述终端支持的数据保护间隔长度匹配的可用保护间隔长度；
具体实施例中，终端STA获取到信标帧Beacon帧后进行分析，具体分析方式可以是，STA检测Beacon帧的各个能力元素，通过解析“HE支持GI”字段获取AP支持的数据GI长度，STA根据自己支持的数据GI长度与获取的AP支持的数据GI长度设置可用数据GI长度。举例说明，假设“HE支持GI”字段信息指示的数据GI长度是{0.8us、1.6us、2.4us}，则AP支持的数据GI 长度是{0.8us、1.6us、2.4us}。STA自身支持的GI长度是{0.4us、0.8us、1.6us、2.4us、3.2us}，可见AP与STA2都支持的数据GI长度是{0.8us、1.6us、}，此时{0.8us、1.6us}即所述的可用数据GI长度。在后续STA与AP通信中，会根据信道状况从可用数据GI长度中选择一个数据GI长度构造PPDU。
S402，所述终端利用所述可用保护间隔长度与所述接入设备进行数据通信。
具体实施例中，STA获取了可用数据GI长度后，即可以利用可用数据GI长度与AP之间进行数据通信，具体的，在后续STA与AP的通信中，会根据信道状况从可用数据GI长度中选择一个数据GI长度构造PPDU。
进一步，STA会根据可用数据GI长度生成关联请求帧，并将关联请求帧发给AP。AP接收到关联请求帧后对其进行分析，若允许STA接入网络则向STA返回关联响应帧。STA接收关联响应帧后对其进行解析，此时，STA与AP之间建立关联，后续AP与STA之间可以进行数据通信传输数据。
本发明实施例中，接入设备构造信标帧，该信标帧包括新增字段，该新增字段表征接入设备支持的多种数据保护间隔长度，接入设备广播所构造的信标帧，终端从接入设备所广播的信标帧中选择与终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用该可用保护间隔长度与接入设备进行通信。本实施方式中，在提出多种数据保护间隔长度的标准中，可将接入设备支持的多种数据保护间隔长度封装进信标帧的新增字段中，成功实现接入设备与终端之间的数据通信。
请参照图27，为本发明提供的一种接入设备的结构示意图，如图所示，本实施提供的接入设备包括构造模块100、封装模块101、处理模块102以及收发模块103；
构造模块100，用于构造信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
具体实施例中，当前标准组正在研究的新一代标准方案HEW支持的数据GI长度是{0.4us、0.8us、1.6us、2.4us、3.2us}，接入设备可以是无线接入 点(Access Point，AP)，AP为了更好的指示数据GI长度信息，本发明构造模块100在信标帧Beacon帧中添加新增字段，记作“HE支持GI”字段，该新增字段用于表征AP支持的多种GI长度。所述的“HE支持GI”用于AP与STA之间交换各自支持的数据GI长度。下面分别从“HE支持GI”字段的位置、“HE支持GI”字段的格式等方面详细描述。
“HE支持GI”字段可放置在Beacon帧中的任意位置，例如，该字段可以放置在Beacon帧的一个已有元素中，也可以在Beacon帧中创立一个新增元素来放置。除此之外，该字段还可以放在携带该Beacon帧的物层的表示层协议数据单元(Presentation Protocol Data Unit，PPDU)帧的SIG域中。下面考虑新创立一个新增元素来放置“HE支持GI”字段的情况。新创立元素记作HE能力元素。此时，可以采取下面的方式来放置“HE支持GI”字段。
在第一种可选的实施方式中，“HE支持GI”字段直接放置在“HE能力”元素中，“HE能力”信息元素包含用来描述支持某种WLAN方案的AP的可选能力的字段。“HE支持GI”字段放置在“HE能力”元素中，例如可采用如图6所示的方式放置。
在第二种可选的实施方式中，“HE支持GI”字段放置在“HE能力”元素的一个字段中，如图7所示，“HE能力”元素中包含一个“HE能力信息”字段，该字段用来指示AP的能力信息。可将“HE支持GI”字段放置在上述“HE能力信息”字段中。
本发明中新增字段“HE支持GI”字段指示AP支持的数据GI长度，新一代标准HEW方案中，支持的带宽有20MHz、40MHz、80MHz或160MHz。不同的带宽下数据GI长度有多种，如图8所示。其中AP支持数据GI长度是0.4us的N(N＝1、2、3……32)倍的长度。HE支持GI”的字段的表示方式有很多种，下面分别举例几种表示方式进行说明，需要说明的是，具体的表示方式在此不作限定。
在第一种可选的实施方式中，新增字段包括每一种预设带宽对应的指示索引值，所述指示索引值表征所述接入设备在该预设带宽下所支持的所有数据保护间隔长度中的最小数据保护间隔长度，预设带宽可以包括20MHz、40MHz、80MHz以及160MHz，具体的表示方式可以是，为了描述方便：此处从图8 的表中所示的不同带宽支持的所有数据GI长度中任意选择M个数据GI长度作为AP支持的GI长度，如图9所示。其中N表示序号，N的值为{1、2、…、M}，m表示指示位的bit数，N与指示位值一一对应。假设选择了6种数据GI长度，即M＝6。则N＝{1、2、…、6}，m＝3，N与指示位关系如图9所示。为了描述方便，假设AP不支持某些数据GI长度，“-”表示对应带宽下AP不支持该GI长度。
假设AP支持的最小数据GI长度记为min_GI，min_GI对应的索引值是N，并且不同的带宽下都对应有一个min_GI。由图9获得在不同带宽下AP支持的min_GI以及其与序号、指示位的关系如图10所示。
所述“HE支持GI”字段包括的指示索引值是指“HE支持GI”字段指示不同带宽下的min_GI对应的索引值。所述“HE支持GI”字段指示不同带宽下的min_GI对应的索引值是指“HE支持GI”字段携带每种带宽下支持的min_GI对应的序号。举例说明：在20MHz带宽下支持的数据GI长度是{0.8us、1.2us、1.6us、2.0、2.4us、2.8、3.2us}，假设20MHz带宽支持的min_GI是0.8us。则20M序号的指示索引值是2。40MHz、80MHz以及160MHz处理参考20MHz。具体的，在Beacon帧中“HE支持GI”字段的指示索引值的表示方式是以二进制编码形式存在，即是以指示位的形式存在，具体的表示形式如图11所示，“HE支持GI”字段包括每一种预设带宽下的指示索引值，指示索引值GI_Idx是以比特信息进行表示。具体的比特信息表示如图12所示。
在第二种可选的实施方式中，新增字段包括每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设数据保护间隔长度；在本实施方式中不考虑带宽的影响，从图8所示的数据GI长度中任意选择M个数据GI长度作为预设数据GI长度，例如：预设数据GI长度为{0.4us、0.8us、1.2us、1.6us、2.0us、2.4us、2.8us、3.2us}。
所述“HE支持GI”字段利用指示位指示AP是否支持该预设数据GI长度，“HE支持GI”字段可以使用单个比特的指示位来指示所有预设数据GI长度中的每一种数据GI长度，每一个比特信息位指示一种数据GI长度，“HE支持GI”字段的表示方式如图13所示，一个比特位指示一种数据GI长度。具体的比特信息指示如图14所示。
在第三种可选的实施方式中，所述新增字段包括每一种预设带宽下每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设带宽下的该预设数据保护间隔长度。本实施方式从图8所示的不同带宽支持的所有数据GI长度中任意选择M个数据GI长度作为AP支持的数据GI长度，此处M＝5，如图15所示。所述“HE支持GI”字段指示每种带宽下支持的数据GI长度是指“HE支持GI”字段使用单个比特指示位指示AP支持的数据GI长度，即每一个bit分别指示不同带宽下支持的数据GI长度，“HE支持GI”字段的表示形式如图16所示。具体比特信息见图17。
收发模块103，用于广播所述信标帧，以及与终端进行数据通信。
具体实施例中，接入设备收发模块103广播所构造的信标帧，具体的广播方法可以是将信标帧进行封装，封装为PPDU格式进行广播，PPDU格式的封装方式可以多种，例如，可以按照现有标准中的802.11ac进行封装为PPDU1，也可以重新根据新一代标准HEW创立一种封装方式，将信标帧封装为PPDU2，具体的创立方式请参照后续实施例的描述，支持新一代标准HEW的终端即可以识别解析PPDU2。
当广播范围内同时存在支持标准802.11ac的终端STA1和支持新一代标准HEW的终端STA2时，为了能够将STA1和STA2均接入网络，则接入设备AP需要广播所封装的PPDU1和PPDU2，对PPDU1的广播方式可以按照现有标准中，以一定的预设周期广播PPDU1，对于PPDU2的广播可以是在PPDU1中增加操作字段，该操作字段指示PPDU2的广播时间，则在操作字段指示的时间广播PPDU2。
STA1接收到AP广播的封装为PPDU1格式的信标帧后，按照现有的802.11ac标准接入网络，STA2检测PPDU1和/或PPDU2后，解析出信标帧Beacon帧，并分析Beacon帧的各个能力元素，并解析能力元素中“HE支持GI”字段获取AP支持的数据GI长度，STA2根据自身支持数据GI长度来获取与AP通信时的可用数据GI长度，可用数据GI长度指，AP支持的数据GI长度中与STA2支持的数据GI长度中匹配的数据GI长度。例如，STA2支持的数据GI长度为{0.8us、1.6us、2.4us、3.2us}，AP支持的数据GI长度为{0.4us、0.8us、1.6us、2.0us、2.4us、3.2us}，可见AP与STA2都支持的数据GI长 度是{0.8us、1.6us、2.4us、3.2us}，此时{0.8us、1.6us、2.4us、3.2us}即所述的可用数据GI长度。后续STA2即利用可选数据GI长度与AP进行数据通信，具体的，STA2可以根据信道状况从可用数据GI长度中选择一种数据GI长度与AP进行数据通信。
可选的，接入设备可以进一步包括封装模块101；
封装模块101，用于分别将所述信标帧封装为第一标准协议数据单元和第二标准协议数据单元；
具体实施例中，考虑在一个网络中同时存在支持第一标准与第二标准的STA的情况。例如，STA1支持第一标准，STA2支持第二标准。上述第一标准或者第二标准为不同的WIFI方案，可以是已有WIFI标准方案例如802.11ac，也可以是当前标准组正在研究的新一代标准方案HEW，还可以是其它类似的WIFI方案。
接入设备AP的封装模块101在将信标帧封装为PPDU格式时，需要封装为两种PPDU格式，分别为第一标准协议数据单元PPDU1和第二标准协议数据单元PPDU2，PPDU1按照第一标准进行封装，PPDU2按照第二标准进行封装。
具体的封装方式请参照图28的描述；
所述收发模块103具体用于广播所述封装为所述第一标准协议数据单元的信标帧和所述封装为所述第二标准协议数据单元的信标帧。
具体实施例中，接入设备收发模块103广播封装为PPDU1的信标帧和封装为PPDU2的信标帧，具体的广播方式可以是，对PPDU1的广播按照预设周期进行广播，对PPDU2的广播可以指定广播时间，但是需要在PPDU1里面增加操作字段，并指示PPDU2的发送时间。
可选的，接入设备可以进一步包括处理模块102；
处理模块102，用于在所述第一标准协议数据单元中增加用于指示所述第二标准协议数据单元发送时间的操作字段；
具体实施例中，所述AP发送所构造的PPDU1和PPDU2。假设PPDU1是按照802.11ac标准进行构造，在802.11ac标准中规定的PPDU1的发送周期是T1，AP发送PPDU2的时间可以任意指定，例如：AP交替发PPDU1与PPDU2；处理模块102可以在PPDU1中增加操作字段进行指示，也可以在PPDU2中增加操作 字段进行指示。操作字段用来指示PPDU2的发送时间。对于操作字段如何指示PPDU2的发送时间，可以有多种指示方式，下面仅列出两种。
在第一种可选的实施方式中，HE操作字段只用一个比特，用来指示下一个m*T(例如：m＝2/3)周期是否有PPDU2，其中T为广播PPDU1的预设周期。即如果HE操作字段的值是1，则表示下一个m*T周期有PPDU2；如果HE操作字段的值是0，则表示下一个m*T周期没有PPDU2。如图25所示，从左边开始第一个PPDU1中的HE操作字段值为1，则表示在下一个m*T周期有PPDU2；第二个PPDU1中的HE操作字段值为0，则在下一个m*T周期没有PPDU2。
在第二种可选的实施方式中，HE操作字段有两个或者多个比特，记为x个，HE操作字段可以用来指示下一个(n+m*T)(例如：m＝2/3，n是x个比特数表示的自然数)周期是否有PPDU2。即如果HE操作字段的值是n，则表示在下一个(n+m*T)周期有PPDU2。如图26所示，从左边开始的第一个PPDU1的HE操作字段的值是1，表示下一个m*T周期有PPDU2；第二个PPDU1的HE操作字段的值是2，表示下两个m*T周期有PPDU2。
所述收发模块103具体用于以预设周期广播所述包括所述操作字段的第一标准协议数据单元；
具体实施例中，接入设备收发模块103以一定的预设周期广播包括操作字段的PPDU1，PPDU1可以是按照802.11ac标准进行封装的，因此广播PPDU1也可以按照802.11ac标准中的预设周期进行广播。
所述收发模块103还用于在所述操作字段指示的发送时间广播所述第二标准协议数据单元。
具体实施例中，如图25或26所示，接入设备收发模块103在操作字段指示的发送时间广播PPDU2，终端在接收到PPDU1时可以根据操作字段获知PPDU2的发送时间，并在所获知的发送时间接收PPDU2。
本发明实施例中，接入设备构造信标帧，该信标帧包括新增字段，该新增字段表征接入设备支持的多种数据保护间隔长度，接入设备广播所构造的信标帧，终端从接入设备所广播的信标帧中选择与终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用该可用保护间隔长度与接入设备进行通信。本 实施方式中，在提出多种数据保护间隔长度的标准中，可将接入设备支持的多种数据保护间隔长度封装进信标帧的新增字段中，成功实现接入设备与终端之间的数据通信。
请参照图28，为本发明提供的一种封装模块的结构示意图，如图所示，本实施例的封装包括第一获取单元1030、第二获取单元1031和封装单元1032；
第一获取单元1030，用于获取所述接入设备在第一标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第一备选数据保护间隔长度；
具体实施例中，AP在第一标准与第二标准分别支持一组数据GI长度。所述第一备选数据GI长度指第一标准中AP支持的一组GI中的最大数据GI长度。举例说明，假设AP在第一标准中支持的数据GI长度是{0.4us、0.8us}，那么所述第一备选数据GI长度指长度为0.8us的数据GI长度。
第二获取单元1031，用于获取所述接入设备在第二标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第二备选数据保护间隔长度；
具体实施例中，AP在第二标准中也支持一组数据GI长度，所述第二备选数据保护间隔长度指第二标准中AP支持的一组GI中的最大数据GI长度。举例说明，假设AP在第二标准中支持的一组数据GI长度为{0.4us、0.8us、1.6us、2.4us、3.2us}，则第二备选数据GI长度指3.2us的数据GI长度。
需要说明的是，在一个网络中支持不同标准的STA更加多样性的情况下，即是存在多种类型的STA，不同类型的STA所支持的标准不同，但是支持不同标准的STA之间可能存在兼容，但是只能前向兼容，不能后向兼容。例如，支持HEW的STA能够兼容支持802.11ac标准的STA，但支持802.11ac标准的STA不能支持HEW标准的STA。当网络中存在多种类型的STA时，例如网络中多样性的STA支持的不同标准的数量为3、4或者更多，可对应确定所述备选数据GI长度，此时所述备选数据GI长度的数量对应的为3、4或者更多。为便于表述，下面均假设网络中存在两个STA分别支持第一标准(例如802.11ac标准方案) 和第二标准(例如当前HEW标准方案)，来描述本发明内容，而所述备选数据GI长度记作GI1与GI2。
封装单元1032，用于根据所述第一备选数据保护间隔长度和所述第二备选数据保护间隔长度，分别将所述信标帧封装为所述第一标准协议数据单元和所述第二标准协议数据单元。
具体实施例中，接入设备封装单元1032根据第一备选数据保护间隔长度GI1和第二备选数据保护间隔长度GI2，将信标帧封装为第一标准协议数据单元PPDU1和第二标准协议数据单元PPDU2，构造得到的PPDU1与PPDU2需符合各自标准中的PPDU格式。下面分别介绍PPDU2与PPDU2的格式。
可选的，PPDU1格式包括前导码和承载数据，该承载数据在包括信标帧，PPDU1格式中前导码GI长度与数据GI长度为GI1，如图18所示。AP发送PPDU1的目的是让支持第一标准的STA1检测到网络。第一标准可以是802.11ac标准。
可选的，第二标准可以是HEW标准，结合HEW标准，PPDU2格式有多种设计方法，在此不作限定，下面列举三种可选的PPDU2格式设计：
在第一种可选的实施方式中，PPDU2包括传统前导码、高效无线局域网前导码和承载数据，如图19所示，其中，L-STF、L-LTF与L-SIG的组合称为传统前导码，HE-SIG、HE-STF等其它可能的字段的组合称为HEW前导码。传统前导码的GI长度、HEW前导码的GI长度以及承载数据的GI长度均为GI2。AP发送PPDU2是为了让支持第二标准的STA2检测到网络，需要说明的是STA2也能够检测到PPDU1，并对其进行处理。图19中各个字段的解释如图20所示。
在第二种可选的实施方式中，如图21所示，PPDU2的格式中包括传统前导码、高效无线局域网前导码和承载数据，其中传统前导码的GI长度为GI1，HEW前导码的GI长度与承载数据的GI长度为GI2。AP发送PPDU2是为了让支持第二标准的STA2检测到网络。由图20得到在第一种可选的实施方式中PPDU2格式的传统前导码长度是80us，由图22得到在第二种可选的实施方式中PPDU2格式的传统前导码是20us，在其余字段长度都一样的情况下， 使用第二种可选的实施方式时传输开销可减少60us。图21中各个字段的解释如图22所示。
在第三种可选的实施方式中，PPDU2的格式如图23所示，PPDU2包括高效无线局域网前导码和承载数据。图23中各个字段的解释如图24所示。其中，HEW前导码的GI长度与承载数据的GI长度均为GI2，AP发送PPDU2是为了让支持第二标准的STA2检测到网络。与第一种可选实施方式中PPDU格式相比，第三种可选实施方式中PPDU格式中去除了传统前导码。因此在其余字段长度一样的情况下，与第一种可选实施方式中的PPDU格式相比，传输开销减少80us。
本发明实施例中，接入设备构造信标帧，该信标帧包括新增字段，该新增字段表征接入设备支持的多种数据保护间隔长度，接入设备广播所构造的信标帧，终端从接入设备所广播的信标帧中选择与终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用该可用保护间隔长度与接入设备进行通信。本实施方式中，在提出多种数据保护间隔长度的标准中，可将接入设备支持的多种数据保护间隔长度封装进信标帧的新增字段中，成功实现接入设备与终端之间的数据通信。
请参照图29，为本发明实施例提供的一种终端的结构示意图；如图所示，本发明实施例的终端包括收发模块200、选择模块201；
收发模块200，用于获取接入设备广播的信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
具体实施例中，终端STA收发模块200获取接入设备所广播的信标帧，信标帧可以是Beacon帧，信标帧中包括新增字段，新增字段表征接入设备支持的多种数据GI长度。STA处理流程与上述接入设备AP处理流程对应。AP侧将Beacon帧以第一标准协议数据单元PPDU1和第二标准协议数据单元PPDU2进行封装，第一标准可以是802.11ac标准，第二标准可以是HEW标准。本实施方式中，当网络中存在支持第一标准的STA1和支持第二标准的STA2，STA1仅能对PPDU1进行正常的检测处理。检测处理的方法可参见802.11ac标准方案， 这里不再赘述。此处描述的STA处理流程指前述STA2的处理流程。
AP以预设周期发送PPDU1，PPDU1包括用于指示PPDU2发送时间的操作字段，该操作字段指示PPDU2的发送时间。具体的，STA获取AP广播的Beacon帧方法可以有三种可选的实施方式：
可选的，收发模块200具体用于获取所述接入设备广播的所述第一标准协议数据单元，并从所述第一标准协议数据单元中解析出所述信标帧；
在第一种可选的实施方式中，STA获取的是AP广播的PPDU1，则STA处理PPDU1，从PPDU1中解析出Beacon帧，同时STA根据PPDU1的前导码确定后续STA与AP之间进行数据通信的前导码长度，例如PPDU1的前导码为GI1，则STA设置后续数据通信的前导码为GI1。
可选的，所述收发模块200具体用于获取所述接入设备广播的所述第二标准协议数据单元，并从所述第二标准协议数据单元中解析出所述信标帧；
在第二种可选的实施方式中，STA获取的是AP广播的PPDU2，则STA处理PPDU2，从PPDU2里面解析出Beacon帧，同时STA根据PPDU2的前导码确定后续STA与AP之间进行数据通信的前导码长度，例如PPDU2的前导码为GI2，则STA设置后续数据通信的前导码为GI2。
可选的，所述收发模块200具体用于获取所述接入设备广播的所述第一标准协议数据单元，从所述第一标准协议数据单元中的操作字段确定所述第二标准协议数据单元的发送时间，并根据所述发送时间获取所述第二标准协议数据单元，从所述第二标准协议数据单元中解析出所述信标帧。
在第三种可选的实施方式中，STA接收到PPDU1，则从PPDU1中通过解析“HE操作”字段获取下一个PPDU2的发送时间。举例说明：假设“HE操作”字段使用一个比特指示下一个周期是否有PPDU2。如果“HE操作”字段指示0，则表示STA需要在下一个周期上检测PPDU2；如果“HE操作”字段指示位1，则表示STA不需要在下一个周期上检测PPDU2。STA从检测到的PPDU2里面解析出Beacon帧。同时STA根据PPDU2的前导码确定后续STA与AP之间进行数据通信的前导码长度，例如PPDU2的前导码为GI2，则STA设置后续数据通信的前导码为GI2。
选择模块201，用于从所述接入设备支持的多种数据保护间隔长度中选择 与所述终端支持的数据保护间隔长度匹配的可用保护间隔长度；
具体实施例中，终端STA获取到信标帧Beacon帧后进行分析，具体分析方式可以是，STA检测Beacon帧的各个能力元素，通过解析“HE支持GI”字段获取AP支持的数据GI长度，STA选择模块201根据自己支持的数据GI长度与获取的AP支持的数据GI长度设置可用数据GI长度。举例说明，假设“HE支持GI”字段信息指示的数据GI长度是{0.8us、1.6us、2.4us}，则AP支持的数据GI长度是{0.8us、1.6us、2.4us}。STA自身支持的GI长度是{0.4us、0.8us、1.6us、2.4us、3.2us}，可见AP与STA2都支持的数据GI长度是{0.8us、1.6us、}，此时{0.8us、1.6us}即所述的可用数据GI长度。在后续STA与AP通信中，会根据信道状况从可用数据GI长度中选择一个数据GI长度构造PPDU。
所述收发模块200还用于利用所述可用保护间隔长度与所述接入设备进行数据通信。
具体实施例中，STA获取了可用数据GI长度后，收发模块200即可以利用可用数据GI长度与AP之间进行数据通信，具体的，在后续STA与AP的通信中，会根据信道状况从可用数据GI长度中选择一个数据GI长度构造PPDU。
进一步，STA会根据可用数据GI长度生成关联请求帧，并将关联请求帧发给AP。AP接收到关联请求帧后对其进行分析，若允许STA接入网络则向STA返回关联响应帧。STA接收关联响应帧后对其进行解析，此时，STA与AP之间建立关联，后续AP与STA之间可以进行数据通信传输数据。
本发明实施例中，接入设备构造信标帧，该信标帧包括新增字段，该新增字段表征接入设备支持的多种数据保护间隔长度，接入设备广播所构造的信标帧，终端从接入设备所广播的信标帧中选择与终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用该可用保护间隔长度与接入设备进行通信。本实施方式中，在提出多种数据保护间隔长度的标准中，可将接入设备支持的多种数据保护间隔长度封装进信标帧的新增字段中，成功实现接入设备与终端之间的数据通信。
请参照图30，为本发明提供的另一种接入设备的结构示意图，图30的接入设备30可用于实现上述方法实施例中各步骤及方法。图30的实施例中，接入设备30包括处理器300、收发器301、存储器302、天线303以及总线304。处理器300控制接入设备30的操作，并可用于处理信号。存储器302可以包括只读存储器和随机存取存储器，并向处理器300提供指令和数据。收发器301可以耦合到天线303。接入设备30的各个组件通过总线系统304耦合在一起，其中总线系统304除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图中将各种总线都标为总线系统304。接入设备30可以为图1所示的AP。下面对各个组件进行详细描述：
所述处理器用于构造信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
所述收发器用于广播所述信标帧，以及与终端进行数据通信。
可选的，当前标准组正在研究的新一代标准方案HEW支持的数据GI长度是{0.4us、0.8us、1.6us、2.4us、3.2us}，接入设备可以是无线接入点(Access Point，AP)，AP为了更好的指示数据GI长度信息，本发明在信标帧Beacon帧中添加新增字段，记作“HE支持GI”字段，该新增字段用于表征AP支持的多种GI长度。所述的“HE支持GI”用于AP与STA之间交换各自支持的数据GI长度。下面分别从“HE支持GI”字段的位置、“HE支持GI”字段的格式等方面详细描述。
“HE支持GI”字段可放置在Beacon帧中的任意位置，例如，该字段可以放置在Beacon帧的一个已有元素中，也可以在Beacon帧中创立一个新增元素来放置。除此之外，该字段还可以放在携带该Beacon帧的物层的表示层协议数据单元(Presentation Protocol Data Unit，PPDU)帧的SIG域中。下面考虑新创立一个新增元素来放置“HE支持GI”字段的情况。新创立元素记作HE能力元素。此时，可以采取下面的方式来放置“HE支持GI”字段。
在第一种可选的实施方式中，“HE支持GI”字段直接放置在“HE能力”元素中，“HE能力”信息元素包含用来描述支持某种WLAN方案的AP的可 选能力的字段。“HE支持GI”字段放置在“HE能力”元素中，例如可采用如图6所示的方式放置。
在第二种可选的实施方式中，“HE支持GI”字段放置在“HE能力”元素的一个字段中，如图7所示，“HE能力”元素中包含一个“HE能力信息”字段，该字段用来指示AP的能力信息。可将“HE支持GI”字段放置在上述“HE能力信息”字段中。
本发明中新增字段“HE支持GI”字段指示AP支持的数据GI长度，新一代标准HEW方案中，支持的带宽有20MHz、40MHz、80MHz或160MHz。不同的带宽下数据GI长度有多种，如图8所示。其中AP支持数据GI长度是0.4us的N(N＝1、2、3……32)倍的长度。HE支持GI”的字段的表示方式有很多种，下面分别举例几种表示方式进行说明，需要说明的是，具体的表示方式在此不作限定。
在第一种可选的实施方式中，新增字段包括每一种预设带宽对应的指示索引值，所述指示索引值表征所述接入设备在该预设带宽下所支持的所有数据保护间隔长度中的最小数据保护间隔长度，预设带宽可以包括20MHz、40MHz、80MHz以及160MHz，具体的表示方式可以是，为了描述方便：此处从图8的表中所示的不同带宽支持的所有数据GI长度中任意选择M个数据GI长度作为AP支持的GI长度，如图9所示。其中N表示序号，N的值为{1、2、…、M}，m表示指示位的bit数，N与指示位值一一对应。假设选择了6种数据GI长度，即M＝6。则N＝{1、2、…、6}，m＝3，N与指示位关系如图9所示。为了描述方便，假设AP不支持某些数据GI长度，“-”表示对应带宽下AP不支持该GI长度。
假设AP支持的最小数据GI长度记为min_GI，min_GI对应的索引值是N，并且不同的带宽下都对应有一个min_GI。由图9获得在不同带宽下AP支持的min_GI以及其与序号、指示位的关系如图10所示。
所述“HE支持GI”字段包括的指示索引值是指“HE支持GI”字段指示不同带宽下的min_GI对应的索引值。所述“HE支持GI”字段指示不同带宽下的min_GI对应的索引值是指“HE支持GI”字段携带每种带宽下支持的min_GI对应的序号。举例说明：在20MHz带宽下支持的数据GI长度是{0.8us、 1.2us、1.6us、2.0、2.4us、2.8、3.2us}，假设20MHz带宽支持的min_GI是0.8us。则20M序号的指示索引值是2。40MHz、80MHz以及160MHz处理参考20MHz。具体的，在Beacon帧中“HE支持GI”字段的指示索引值的表示方式是以二进制编码形式存在，即是以指示位的形式存在，具体的表示形式如图11所示，“HE支持GI”字段包括每一种预设带宽下的指示索引值，指示索引值GI_Idx是以比特信息进行表示。具体的比特信息表示如图12所示。
在第二种可选的实施方式中，新增字段包括每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设数据保护间隔长度；在本实施方式中不考虑带宽的影响，从图8所示的数据GI长度中任意选择M个数据GI长度作为预设数据GI长度，例如：预设数据GI长度为{0.4us、0.8us、1.2us、1.6us、2.0us、2.4us、2.8us、3.2us}。
所述“HE支持GI”字段利用指示位指示AP是否支持该预设数据GI长度，“HE支持GI”字段可以使用单个比特的指示位来指示所有预设数据GI长度中的每一种数据GI长度，每一个比特信息位指示一种数据GI长度，“HE支持GI”字段的表示方式如图13所示，一个比特位指示一种数据GI长度。具体的比特信息指示如图14所示。
在第三种可选的实施方式中，所述新增字段包括每一种预设带宽下每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设带宽下的该预设数据保护间隔长度。本实施方式从图8所示的不同带宽支持的所有数据GI长度中任意选择M个数据GI长度作为AP支持的数据GI长度，此处M＝5，如图15所示。所述“HE支持GI”字段指示每种带宽下支持的数据GI长度是指“HE支持GI”字段使用单个比特指示位指示AP支持的数据GI长度，即每一个bit分别指示不同带宽下支持的数据GI长度，“HE支持GI”字段的表示形式如图16所示。具体比特信息见图17。
可选的，接入设备广播所构造的信标帧，具体的广播方法可以是将信标帧进行封装，封装为PPDU格式进行广播，PPDU格式的封装方式可以多种，例如，可以按照现有标准中的802.11ac进行封装为PPDU1，也可以重新根据新一代标准HEW创立一种封装方式，将信标帧封装为PPDU2，具体的创立方式请参照图3的描述，支持新一代标准HEW的终端即可以识别解析PPDU2。
当广播范围内同时存在支持标准802.11ac的终端STA1和支持新一代标准HEW的终端STA2时，为了能够将STA1和STA2均接入网络，则接入设备AP需要广播所封装的PPDU1和PPDU2，对PPDU1的广播方式可以按照现有标准中，以一定的预设周期广播PPDU1，对于PPDU2的广播可以是在PPDU1中增加操作字段，该操作字段指示PPDU2的广播时间，则在操作字段指示的时间广播PPDU2。
STA1接收到AP广播的封装为PPDU1格式的信标帧后，按照现有的802.11ac标准接入网络，STA2检测PPDU1和/或PPDU2后，解析出信标帧Beacon帧，并分析Beacon帧的各个能力元素，并解析能力元素中“HE支持GI”字段获取AP支持的数据GI长度，STA2根据自身支持数据GI长度来获取与AP通信时的可用数据GI长度，可用数据GI长度指，AP支持的数据GI长度中与STA2支持的数据GI长度中匹配的数据GI长度。例如，STA2支持的数据GI长度为{0.8us、1.6us、2.4us、3.2us}，AP支持的数据GI长度为{0.4us、0.8us、1.6us、2.0us、2.4us、3.2us}，可见AP与STA2都支持的数据GI长度是{0.8us、1.6us、2.4us、3.2us}，此时{0.8us、1.6us、2.4us、3.2us}即所述的可用数据GI长度。后续STA2即利用可选数据GI长度与AP进行数据通信，具体的，STA2可以根据信道状况从可用数据GI长度中选择一种数据GI长度与AP进行数据通信。
所述处理器还用于分别将所述信标帧封装为第一标准协议数据单元和第二标准协议数据单元；
所述收发器还用于广播所述封装为所述第一标准协议数据单元的信标帧和所述封装为所述第二标准协议数据单元的信标帧。
可选的，考虑在一个网络中同时存在支持第一标准与第二标准的STA的情况。例如，STA1支持第一标准，STA2支持第二标准。上述第一标准或者第二标准为不同的WIFI方案，可以是已有WIFI标准方案例如802.11ac，也可以是当前标准组正在研究的新一代标准方案HEW，还可以是其它类似的WIFI方案。
接入设备AP在将信标帧封装为PPDU格式时，需要封装为两种PPDU格式，分别为第一标准协议数据单元PPDU1和第二标准协议数据单元PPDU2， PPDU1按照第一标准进行封装，PPDU2按照第二标准进行封装。
可选的，接入设备广播封装为PPDU1的信标帧和封装为PPDU2的信标帧，具体的广播方式可以是，对PPDU1的广播按照预设周期进行广播，对PPDU2的广播可以指定广播时间，但是需要在PPDU1里面增加操作字段，并指示PPDU2的发送时间。
所述处理器还用于获取所述接入设备在第一标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第一备选数据保护间隔长度；
所述处理器还用于获取所述接入设备在第二标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第二备选数据保护间隔长度；
所述处理器还用于根据所述第一备选数据保护间隔长度和所述第二备选数据保护间隔长度，分别将所述信标帧封装为所述第一标准协议数据单元和所述第二标准协议数据单元。
可选的，AP在第一标准与第二标准分别支持一组数据GI长度。所述第一备选数据GI长度指第一标准中AP支持的一组GI中的最大数据GI长度。举例说明，假设AP在第一标准中支持的数据GI长度是{0.4us、0.8us}，那么所述第一备选数据GI长度指长度为0.8us的数据GI长度。
可选的，AP在第二标准中也支持一组数据GI长度，所述第二备选数据保护间隔长度指第二标准中AP支持的一组GI中的最大数据GI长度。举例说明，假设AP在第二标准中支持的一组数据GI长度为{0.4us、0.8us、1.6us、2.4us、3.2us}，则第二备选数据GI长度指3.2us的数据GI长度。
需要说明的是，在一个网络中支持不同标准的STA更加多样性的情况下，即是存在多种类型的STA，不同类型的STA所支持的标准不同，但是支持不同标准的STA之间可能存在兼容，但是只能前向兼容，不能后向兼容。例如，支持HEW的STA能够兼容支持802.11ac标准的STA，但支持802.11ac标准的STA不能支持HEW标准的STA。当网络中存在多种类型的STA时，例如网络中多样性的STA支持的不同标准的数量为3、4或者更多，可对应确定所述备选数据GI长度，此时所述备选数据GI长度的数量对应的为3、4或者更多。为便于表述，下面均假设网络中存在两个STA分别支持第一标准(例如802.11ac标准方案) 和第二标准(例如当前HEW标准方案)，来描述本发明内容，而所述备选数据GI长度记作GI1与GI2。
可选的，接入设备根据第一备选数据保护间隔长度GI1和第二备选数据保护间隔长度GI2，将信标帧封装为第一标准协议数据单元PPDU1和第二标准协议数据单元PPDU2，构造得到的PPDU1与PPDU2需符合各自标准中的PPDU格式。下面分别介绍PPDU2与PPDU2的格式。
可选的，PPDU1格式包括前导码和承载数据，该承载数据在包括信标帧，PPDU1格式中前导码GI长度与数据GI长度为GI1，如图18所示。AP发送PPDU1的目的是让支持第一标准的STA1检测到网络。第一标准可以是802.11ac标准。
可选的，第二标准可以是HEW标准，结合HEW标准，PPDU2格式有多种设计方法，在此不作限定，下面列举三种可选的PPDU2格式设计：
在第一种可选的实施方式中，PPDU2包括传统前导码、高效无线局域网前导码和承载数据，如图19所示，其中，L-STF、L-LTF与L-SIG的组合称为传统前导码，HE-SIG、HE-STF等其它可能的字段的组合称为HEW前导码。传统前导码的GI长度、HEW前导码的GI长度以及承载数据的GI长度均为GI2。AP发送PPDU2是为了让支持第二标准的STA2检测到网络，需要说明的是STA2也能够检测到PPDU1，并对其进行处理。图19中各个字段的解释如图20所示。
在第二种可选的实施方式中，如图21所示，PPDU2的格式中包括传统前导码、高效无线局域网前导码和承载数据，其中传统前导码的GI长度为GI1，HEW前导码的GI长度与承载数据的GI长度为GI2。AP发送PPDU2是为了让支持第二标准的STA2检测到网络。由图20得到在第一种可选的实施方式中PPDU2格式的传统前导码长度是80us，由图22得到在第二种可选的实施方式中PPDU2格式的传统前导码是20us，在其余字段长度都一样的情况下，使用第二种可选的实施方式时传输开销可减少60us。图21中各个字段的解释如图22所示。
在第三种可选的实施方式中，PPDU2的格式如图23所示，PPDU2包括高效无线局域网前导码和承载数据。图23中各个字段的解释如图24所示。其 中，HEW前导码的GI长度与承载数据的GI长度均为GI2，AP发送PPDU2是为了让支持第二标准的STA2检测到网络。与第一种可选实施方式中PPDU格式相比，第三种可选实施方式中PPDU格式中去除了传统前导码。因此在其余字段长度一样的情况下，与第一种可选实施方式中的PPDU格式相比，传输开销减少80us。
所述处理器还用于在所述第一标准协议数据单元中增加用于指示所述第二标准协议数据单元发送时间的操作字段；
所述收发器还用于以预设周期广播所述包括所述操作字段的第一标准协议数据单元；
所述收发器还用于在所述操作字段指示的发送时间广播所述第二标准协议数据单元。
可选的，所述AP发送所构造的PPDU1和PPDU2。假设PPDU1是按照802.11ac标准进行构造，在802.11ac标准中规定的PPDU1的发送周期是T1，AP发送PPDU2的时间可以任意指定，例如：AP交替发PPDU1与PPDU2；也可以在PPDU1中增加操作字段进行指示，也可以在PPDU2中增加操作字段进行指示。操作字段用来指示PPDU2的发送时间。对于操作字段如何指示PPDU2的发送时间，可以有多种指示方式，下面仅列出两种。
在第一种可选的实施方式中，HE操作字段只用一个比特，用来指示下一个m*T(例如：m＝2/3)周期是否有PPDU2，其中T为广播PPDU1的预设周期。即如果HE操作字段的值是1，则表示下一个m*T周期有PPDU2；如果HE操作字段的值是0，则表示下一个m*T周期没有PPDU2。如图25所示，从左边开始第一个PPDU1中的HE操作字段值为1，则表示在下一个m*T周期有PPDU2；第二个PPDU1中的HE操作字段值为0，则在下一个m*T周期没有PPDU2。
在第二种可选的实施方式中，HE操作字段有两个或者多个比特，记为x个，HE操作字段可以用来指示下一个(n+m*T)(例如：m＝2/3，n是x个比特数表示的自然数)周期是否有PPDU2。即如果HE操作字段的值是n，则表示在下一个(n+m*T)周期有PPDU2。如图26所示，从左边开始的第一个PPDU1的HE操作字段的值是1，表示下一个m*T周期有PPDU2；第二个PPDU1的HE操作字段的值是2，表示下两个m*T周期有PPDU2。
可选的，接入设备以一定的预设周期广播包括操作字段的PPDU1，PPDU1可以是按照802.11ac标准进行封装的，因此广播PPDU1也可以按照802.11ac标准中的预设周期进行广播。
可选的，如图25或26所示，接入设备在操作字段指示的发送时间广播PPDU2，终端在接收到PPDU1时可以根据操作字段获知PPDU2的发送时间，并在所获知的发送时间接收PPDU2。
本发明实施例中，接入设备构造信标帧，该信标帧包括新增字段，该新增字段表征接入设备支持的多种数据保护间隔长度，接入设备广播所构造的信标帧，终端从接入设备所广播的信标帧中选择与终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用该可用保护间隔长度与接入设备进行通信。本实施方式中，在提出多种数据保护间隔长度的标准中，可将接入设备支持的多种数据保护间隔长度封装进信标帧的新增字段中，成功实现接入设备与终端之间的数据通信。
请参照图31，为本发明提供的另一种终端的结构示意图，图31的终端40可用于实现上述方法实施例中各步骤及方法。图31的实施例中，终端40包括处理器400、收发器401、存储器402、天线403和总线404。处理器400控制终端40的操作，并可用于处理信号。存储器402可以包括只读存储器和随机存取存储器，并向处理器400提供指令和数据。收发器401可以耦合到天线403。终端40的各个组件通过总线系统404耦合在一起，其中总线系统404除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图中将各种总线都标为总线系统404。例如，终端40可以为图1所示的STA1、STA2和STA3。下面对终端40的各个组件进行详细介绍。
所述收发器用于获取接入设备广播的信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
所述处理器用于从所述接入设备支持的多种数据保护间隔长度中选择与 所述终端支持的数据保护间隔长度匹配的可用保护间隔长度；
所述收发器用于利用所述可用保护间隔长度与所述接入设备进行数据通信。
可选的，终端STA获取接入设备所广播的信标帧，信标帧可以是Beacon帧，信标帧中包括新增字段，新增字段表征接入设备支持的多种数据GI长度。STA处理流程与上述接入设备AP处理流程对应。AP侧将Beacon帧以第一标准协议数据单元PPDU1和第二标准协议数据单元PPDU2进行封装，第一标准可以是802.11ac标准，第二标准可以是HEW标准。本实施方式中，当网络中存在支持第一标准的STA1和支持第二标准的STA2，STA1仅能对PPDU1进行正常的检测处理。检测处理的方法可参见802.11ac标准方案，这里不再赘述。此处描述的STA处理流程指前述STA2的处理流程。
AP以预设周期发送PPDU1，PPDU1包括用于指示PPDU2发送时间的操作字段，该操作字段指示PPDU2的发送时间。具体的，STA获取AP广播的Beacon帧方法可以有三种可选的实施方式：
在第一种可选的实施方式中，STA获取的是AP广播的PPDU1，则STA处理PPDU1，从PPDU1中解析出Beacon帧，同时STA根据PPDU1的前导码确定后续STA与AP之间进行数据通信的前导码长度，例如PPDU1的前导码为GI1，则STA设置后续数据通信的前导码为GI1。
在第二种可选的实施方式中，STA获取的是AP广播的PPDU2，则STA处理PPDU2，从PPDU2里面解析出Beacon帧，同时STA根据PPDU2的前导码确定后续STA与AP之间进行数据通信的前导码长度，例如PPDU2的前导码为GI2，则STA设置后续数据通信的前导码为GI2。
在第三种可选的实施方式中，STA接收到PPDU1，则从PPDU1中通过解析“HE操作”字段获取下一个PPDU2的发送时间。举例说明：假设“HE操作”字段使用一个比特指示下一个周期是否有PPDU2。如果“HE操作”字段指示0，则表示STA需要在下一个周期上检测PPDU2；如果“HE操作”字段指示位1，则表示STA不需要在下一个周期上检测PPDU2。STA从检测到的PPDU2里面解析出Beacon帧。同时STA根据PPDU2的前导码确定后续STA与AP之间进行数据通信的前导码长度，例如PPDU2的前导码为GI2，则STA设置后续数据通信的 前导码为GI2。
可选的，终端STA获取到信标帧Beacon帧后进行分析，具体分析方式可以是，STA检测Beacon帧的各个能力元素，通过解析“HE支持GI”字段获取AP支持的数据GI长度，STA根据自己支持的数据GI长度与获取的AP支持的数据GI长度设置可用数据GI长度。举例说明，假设“HE支持GI”字段信息指示的数据GI长度是{0.8us、1.6us、2.4us}，则AP支持的数据GI长度是{0.8us、1.6us、2.4us}。STA自身支持的GI长度是{0.4us、0.8us、1.6us、2.4us、3.2us}，可见AP与STA2都支持的数据GI长度是{0.8us、1.6us、}，此时{0.8us、1.6us}即所述的可用数据GI长度。在后续STA与AP通信中，会根据信道状况从可用数据GI长度中选择一个数据GI长度构造PPDU。
可选的，STA获取了可用数据GI长度后，即可以利用可用数据GI长度与AP之间进行数据通信，具体的，在后续STA与AP的通信中，会根据信道状况从可用数据GI长度中选择一个数据GI长度构造PPDU。
进一步，STA会根据可用数据GI长度生成关联请求帧，并将关联请求帧发给AP。AP接收到关联请求帧后对其进行分析，若允许STA接入网络则向STA返回关联响应帧。STA接收关联响应帧后对其进行解析，此时，STA与AP之间建立关联，后续AP与STA之间可以进行数据通信传输数据。
所述收发器还用于获取所述接入设备广播的所述第一标准协议数据单元，并从所述第一标准协议数据单元中解析出所述信标帧；或者，
所述收发器还用于获取所述接入设备广播的所述第二标准协议数据单元，并从所述第二标准协议数据单元中解析出所述信标帧；或者，
所述收发器还用于获取所述接入设备广播的所述第一标准协议数据单元，从所述第一标准协议数据单元中的操作字段确定所述第二标准协议数据单元的发送时间，并根据所述发送时间获取所述第二标准协议数据单元，从所述第二标准协议数据单元中解析出所述信标帧。
本发明实施例中，接入设备构造信标帧，该信标帧包括新增字段，该新增字段表征接入设备支持的多种数据保护间隔长度，接入设备广播所构造的信标帧，终端从接入设备所广播的信标帧中选择与终端支持的数据保护间隔长度匹 配的可用保护间隔长度，并利用该可用保护间隔长度与接入设备进行通信。本实施方式中，在提出多种数据保护间隔长度的标准中，可将接入设备支持的多种数据保护间隔长度封装进信标帧的新增字段中，成功实现接入设备与终端之间的数据通信。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明权利要求所作的等同变化，仍属本发明所涵盖的范围。

Claims (22)

  1. 一种数据通信方法，其特征在于，包括:
    接入设备构造信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
    所述接入设备广播所述信标帧，以使终端从所述信标帧中选择与所述终端支持的数据保护间隔长度匹配的可用保护间隔长度，并利用所述可用保护间隔长度与所述接入设备进行数据通信。
  2. 如权利要求1所述的方法，其特征在于，所述信标帧包括至少一个元素，所述至少一个元素中的特定元素携带所述新增字段，所述特定元素为已有元素或者新增元素。
  3. 如权利要求2所述的方法，其特征在于，所述新增字段包括每一种预设带宽对应的指示索引值，所述指示索引值表征所述接入设备在该预设带宽下所支持的所有数据保护间隔长度中的最小数据保护间隔长度；或者，
    所述新增字段包括每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设数据保护间隔长度；或者，
    所述新增字段包括每一种预设带宽下每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设带宽下的该预设数据保护间隔长度。
  4. 如权利要求1所述的方法，其特征在于，所述接入设备构造信标帧之后，还包括：
    所述接入设备分别将所述信标帧封装为第一标准协议数据单元和第二标准协议数据单元；
    所述接入设备广播所述信标帧，包括：
    所述接入设备广播所述封装为所述第一标准协议数据单元的信标帧和所述封装为所述第二标准协议数据单元的信标帧。
  5. 如权利要求4所述的方法，其特征在于，所述接入设备支持的多种数据保护间隔长度中包括所述接入设备在第一标准中所支持的数据保护间隔长度和所述接入设备在第二标准中所支持的数据保护间隔长度；
    所述接入设备分别将所述信标帧封装为第一标准协议数据单元和第二标准协议数据单元，包括：
    所述接入设备获取所述接入设备在第一标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第一备选数据保护间隔长度；
    所述接入设备获取所述接入设备在第二标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第二备选数据保护间隔长度；
    所述接入设备根据所述第一备选数据保护间隔长度和所述第二备选数据保护间隔长度，分别将所述信标帧封装为所述第一标准协议数据单元和所述第二标准协议数据单元。
  6. 如权利要求5所述的方法，其特征在于，所述第一标准协议数据单元包括前导码和承载数据，所述承载数据包括所述信标帧，所述前导码保护间隔长度和所述承载数据的保护间隔长度为所述第一备选数据保护间隔长度。
  7. 如权利要求5所述的方法，其特征在于，所述第二标准协议数据单元包括传统前导码、高效无线局域网前导码和承载数据，所述传统前导码的保护间隔长度、所述高效无线局域网前导码的保护间隔长度以及所述承载数据的保护间隔长度均为所述第二备选数据保护间隔长度；或者，
    所述第二标准协议数据单元包括传统前导码、高效无线局域网前导码和承载数据，所述传统前导码的保护间隔长度为所述第一备选数据保护间隔长度，所述高效无线局域网前导码和所述承载数据的保护间隔长度为所述第二备选数据保护间隔长度；或者，
    所述第二标准协议数据单元包括高效无线局域网前导码和承载数据，所述高效无线局域网前导码的保护间隔长度和所述承载数据的保护间隔长度均为所述第二备选数据保护间隔长度。
  8. 如权利要求5所述的方法，其特征在于，所述接入设备广播所述封装为所述第一标准协议数据单元的信标帧和所述封装为所述第二标准协议数据单元的信标帧之前，还包括：
    所述接入设备在所述第一标准协议数据单元中增加用于指示所述第二标准协议数据单元发送时间的操作字段；
    所述接入设备广播所述封装为所述第一标准协议数据单元的信标帧和所述封装为所述第二标准协议数据单元的信标帧，包括：
    所述接入设备以预设周期广播所述包括所述操作字段的第一标准协议数据单元；
    所述接入设备在所述操作字段指示的发送时间广播所述第二标准协议数据单元。
  9. 一种数据通信方法，其特征在于，包括：
    终端获取接入设备广播的信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
    所述终端从所述接入设备支持的多种数据保护间隔长度中选择与所述终端支持的数据保护间隔长度匹配的可用保护间隔长度；
    所述终端利用所述可用保护间隔长度与所述接入设备进行数据通信。
  10. 如权利要求9所述的方法，其特征在于，所述信标帧以第一标准协议数据单元进行封装和第二标准协议数据单元进行封装，所述接入设备以预设周期发送所述第一标准协议数据单元，所述第一标准协议数据单元包括用于指示所述第二标准协议数据单元发送时间的操作字段。
  11. 如权利要求10所述的方法，其特征在于，所述终端获取接入设备广播的信标帧，包括：
    所述终端获取所述接入设备广播的所述第一标准协议数据单元，并从所述第一标准协议数据单元中解析出所述信标帧；或者，
    所述终端获取所述接入设备广播的所述第二标准协议数据单元，并从所述 第二标准协议数据单元中解析出所述信标帧；或者，
    所述终端获取所述接入设备广播的所述第一标准协议数据单元，从所述第一标准协议数据单元中的操作字段确定所述第二标准协议数据单元的发送时间，并根据所述发送时间获取所述第二标准协议数据单元，从所述第二标准协议数据单元中解析出所述信标帧。
  12. 一种接入设备，其特征在于，所述接入设备包括：
    构造模块，用于构造信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
    收发模块，用于广播所述信标帧，以及与终端进行数据通信。
  13. 如权利要求12所述的接入设备，其特征在于，所述信标帧包括至少一个元素，所述至少一个元素中的特定元素携带所述新增字段，所述特定元素为已有元素或者新增元素。
  14. 如权利要求13所述的接入设备，其特征在于，所述新增字段包括每一种预设带宽对应的指示索引值，所述指示索引值表征所述接入设备在该预设带宽下所支持的所有数据保护间隔长度中的最小数据保护间隔长度；或者，
    所述新增字段包括每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设数据保护间隔长度；或者，
    所述新增字段包括每一种预设带宽下每一种预设数据保护间隔长度的指示位，所述指示位用于指示所述接入设备是否支持该预设带宽下的该预设数据保护间隔长度。
  15. 如权利要求12所述的接入设备，其特征在于，所述接入设备还包括：
    封装模块，用于分别将所述信标帧封装为第一标准协议数据单元和第二标准协议数据单元；
    所述收发模块具体用于广播所述封装为所述第一标准协议数据单元的信标帧和所述封装为所述第二标准协议数据单元的信标帧。
  16. 如权利要求15所述的接入设备，其特征在于，所述接入设备支持的多种数据保护间隔长度中包括所述接入设备在第一标准中所支持的数据保护间隔长度和所述接入设备在第二标准中所支持的数据保护间隔长度；所述封装模块包括：
    第一获取单元，用于获取所述接入设备在第一标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第一备选数据保护间隔长度；
    第二获取单元，用于获取所述接入设备在第二标准中所支持的数据保护间隔长度中最大数据保护间隔长度，并将其确定为第二备选数据保护间隔长度；
    封装单元，用于根据所述第一备选数据保护间隔长度和所述第二备选数据保护间隔长度，分别将所述信标帧封装为所述第一标准协议数据单元和所述第二标准协议数据单元。
  17. 如权利要求16所述的接入设备，其特征在于，所述第一标准协议数据单元包括前导码和承载数据，所述承载数据包括所述信标帧，所述前导码保护间隔长度和所述承载数据的保护间隔长度为所述第一备选数据保护间隔长度。
  18. 如权利要求16所述的接入设备，其特征在于，所述第二标准协议数据单元包括传统前导码、高效无线局域网前导码和承载数据，所述传统前导码的保护间隔长度、所述高效无线局域网前导码的保护间隔长度以及所述承载数据的保护间隔长度均为所述第二备选数据保护间隔长度；或者，
    所述第二标准协议数据单元包括传统前导码、高效无线局域网前导码和承载数据，所述传统前导码的保护间隔长度为所述第一备选数据保护间隔长度，所述高效无线局域网前导码和所述承载数据的保护间隔长度为所述第二备选数据保护间隔长度；或者，
    所述第二标准协议数据单元包括高效无线局域网前导码和承载数据，所述高效无线局域网前导码的保护间隔长度和所述承载数据的保护间隔长度均为所述第二备选数据保护间隔长度。
  19. 如权利要求16所述的接入设备，其特征在于，所述接入设备还包括：
    处理模块，用于在所述第一标准协议数据单元中增加用于指示所述第二标准协议数据单元发送时间的操作字段；
    所述收发模块具体用于以预设周期广播所述包括所述操作字段的第一标准协议数据单元；
    所述收发模块还用于在所述操作字段指示的发送时间广播所述第二标准协议数据单元。
  20. 一种终端，其特征在于，所述终端包括：
    收发模块，用于获取接入设备广播的信标帧，所述信标帧包括新增字段，所述新增字段表征所述接入设备支持的多种数据保护间隔长度；
    选择模块，用于从所述接入设备支持的多种数据保护间隔长度中选择与所述终端支持的数据保护间隔长度匹配的可用保护间隔长度；
    所述收发模块还用于利用所述可用保护间隔长度与所述接入设备进行数据通信。
  21. 如权利要求20所述的终端，其特征在于，所述信标帧以第一标准协议数据单元进行封装和第二标准协议数据单元进行封装，所述接入设备以预设周期发送所述第一标准协议数据单元，所述第一标准协议数据单元包括用于指示所述第二标准协议数据单元发送时间的操作字段。
  22. 如权利要求21所述的终端，其特征在于，
    所述收发模块具体用于获取所述接入设备广播的所述第一标准协议数据单元，并从所述第一标准协议数据单元中解析出所述信标帧；或者，
    所述收发模块具体用于获取所述接入设备广播的所述第二标准协议数据单元，并从所述第二标准协议数据单元中解析出所述信标帧；或者，
    所述收发模块具体用于获取所述接入设备广播的所述第一标准协议数据单元，从所述第一标准协议数据单元中的操作字段确定所述第二标准协议数据 单元的发送时间，并根据所述发送时间获取所述第二标准协议数据单元，从所述第二标准协议数据单元中解析出所述信标帧。
PCT/CN2014/087403 2014-09-25 2014-09-25 一种数据通信方法及相关装置 Ceased WO2016045036A1 (zh)

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