JP2019071675A - Data communication method and related device - Google Patents

Abstract

To provide a data communication method and a related device.SOLUTION: A data communication method includes the steps of: constructing a beacon frame by an access device, the beacon frame including a newly added field, and the newly added field representing a plurality of data guard intervals supported by the access device; and selecting, by a terminal, a usable guard interval length according with data interval lengths supported by the terminal from the beacon frame, and broadcasting the beacon frame by the access device so as to be able to perform data communication with the access device by using the usable guard interval length. The use of the invention enables data communication between the access device and a terminal in the case where the access device supports a plurality of data guard interval lengths.SELECTED DRAWING: Figure 1

Description

This application is a continuation of International Application No. PCT / CN2014 / 087403, filed September 25, 2014, which is incorporated herein by reference in its entirety.
The present invention relates to the field of data communication technology, and more particularly to a data communication method and related apparatus.

  With the development of communication technology, wireless indoor area network (WLAN) technology based on the IEEE 802.11 standard has been widely applied. Currently, various mainstream WLAN standards (such as 802.11n and 802.11ac) introduce guard intervals (GIs) to eliminate inter-symbol interference caused by channel delay spread. 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 intersymbol interference as much as possible. The GI length used in the 802.11ac standard is 0.8 us. In the process of data communication between the access device and the terminal, the AP and STA use a preamble GI length of 0.8 us and a data GI length of 0.8 us.

  The IEEE officially proposed the next generation WLAN standard, high efficiency WLAN (HEW) in May 2013, but the HEW standard is called 802.11ax. In HEW standardization work, it is proposed to provide more options for GI length, including GI lengths such as 3.2 us, 2.4, 1.6 us, 1.2 us, 0.8 us, 0.4 us, etc. It is done. In HEW solutions with multiple selectable GI lengths, there is currently no way to set the GI length for data communication between the terminal and the access device in the HEW.

  Embodiments of the present invention provide data communication methods and related devices that can implement data communication between an access device and a terminal when the access device supports multiple data guard interval lengths.

According to a first aspect of the present invention, there is provided a data communication method, the method comprising the steps of constructing a beacon frame by an access device, wherein the beacon frame includes a newly added field, and the newly added field. Represents a plurality of data guard interval lengths supported by the access device,
The terminal can select an available guard interval length from the beacon frame that matches the data guard interval length supported by the terminal, and enable data communication with the access device by using the available guard interval length The access device broadcasts a beacon frame;
including.

  According to a first aspect, in a first possible implementation manner, the beacon frame comprises at least one element, a particular element of the at least one element carrying a newly added field, and the particular element Is an existing element or a newly added element.

Based on the first possible implementation method of the first aspect, in the second possible implementation method, the newly added field includes an indication index value corresponding to each preset bandwidth, The indication index value represents the minimum data guard interval length of all the data guard interval lengths supported by the access device within the preset bandwidth, or the newly added field corresponds to each preset data guard interval. A long indicator bit is used, which is used to indicate whether the access device supports a preset data guard interval length, or a newly added field is within each preset bandwidth. Of each preset data guard interval length, the Access device is used to indicate whether they support the preset data guard interval length in the preset bandwidth.

In accordance with the first aspect, in a third possible implementation method, after the step of constructing a beacon frame by the access device, the method comprises
Separately encapsulating the beacon frame into a first standard protocol data unit and a second standard protocol data unit by the access device;
Broadcasting the beacon frame by the access device
Broadcasting by the access device the beacon frame encapsulated in the first standard protocol data unit and the beacon frame encapsulated in the second standard protocol data unit.

Based on a third possible implementation method of the first aspect, in a fourth possible implementation method, the plurality of data guard interval lengths supported by the access device are supported by the access device in the first standard. A data guard interval length and a data guard interval length supported by the access device in the second standard, wherein the access device separately encapsulates the beacon frame in the first standard protocol data unit and the second standard protocol data unit The steps to
Obtaining by the access device the maximum data guard interval length in the data guard interval length supported by the access device in the first standard, and determining the maximum data guard interval length as the first alternative data guard interval length;
Obtaining by the access device the maximum data guard interval length in the data guard interval length supported by the access device in the second standard, and determining the maximum data guard interval length as the second alternative data guard interval length;
Encapsulating the beacon frame separately into a first standard protocol data unit and a second standard protocol data unit by the access device with the first alternative data guard interval length and the second alternative data guard interval length;
including.

  According to a fourth possible implementation method of the first aspect, in the fifth possible implementation method, the first standard protocol data unit includes preamble and bearer data, and the bearer data includes beacon frames. The guard interval length of the preamble and the guard interval length of the bearer data are the first alternative data guard interval length.

Based on the fourth possible implementation method of the first aspect, in the sixth possible implementation method, the second standard protocol data unit comprises: a legacy preamble, a high efficiency wireless local area network preamble, and bearer data The guard interval length of the legacy preamble, the guard interval length of the high efficiency wireless local area network preamble, and the guard interval length of the bearer data are respectively the second alternative data guard interval length, or
The second standard protocol data unit includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, and the guard interval length of the legacy preamble is the first alternative data guard interval length, and the high efficiency wireless local area The guard interval length of the network preamble and the guard interval length of the bearer data are the second alternative data guard interval length, or
The second standard protocol data unit includes a high efficiency wireless local area network preamble and bearer data, and the guard interval length of the high efficiency wireless local area network preamble and the guard interval length of the bearer data are both the second alternative data guard interval It is a long.

According to a fourth possible implementation method of the first aspect, in a seventh possible implementation method, the beacon frame and the second standard protocol data unit encapsulated in the first standard protocol data unit Before the step of the access device broadcasting the encapsulated beacon frame, the method
The access device may add the operation field used to indicate the transmission time of the second standard protocol data unit to the first standard protocol data unit;
The access device broadcasting the beacon frame encapsulated in the first standard protocol data unit and the beacon frame encapsulated in the second standard protocol data unit,
Broadcasting the first standard protocol data unit containing the operation field for a pre-set period of time by the access device;
The access device broadcasts a second standard protocol data unit at a transmission time indicated by the operation field;
including.

A second aspect of the present invention provides a data communication method, which is a step in which a terminal acquires a beacon frame broadcast by an access device, the beacon frame including a newly added field, and The added field represents a plurality of data guard interval lengths supported by the access device;
The terminal selecting an available guard interval length that matches the data guard interval length supported by the terminal from a plurality of data guard interval lengths supported by the access device;
The terminal is in data communication with the access device by using the available guard interval length;
including.

  According to a second aspect, in the first possible implementation manner, the beacon frame is encapsulated in a first standard protocol data unit and a second standard protocol data unit, and the access device is preset , And transmits the first standard protocol data unit, the first standard protocol data unit includes an operation field used to indicate the transmission time of the second standard protocol data unit.

In the second feasible implementation method based on the first feasible implementation method of the second aspect, the step of the terminal obtaining a beacon frame broadcast by the access device is:
The terminal obtains the first standard protocol data unit broadcast by the access device and analyzes the beacon frame from the first standard protocol data unit, or
The terminal obtains the second standard protocol data unit broadcast by the access device and analyzes the beacon frame from the second standard protocol data unit, or
The terminal acquires the first standard protocol data unit broadcast by the access device, determines the transmission time of the second standard protocol data unit from the operation field in the first standard protocol data unit, and determines the second transmission time according to the transmission time. Obtaining a standard protocol data unit and analyzing the beacon frame from the second standard protocol data unit,
including.

A third aspect of the present invention provides an access device, wherein the access device is a construction module configured to construct a beacon frame, wherein the beacon frame includes a newly added field, and the newly added beacon frame is added. A construction module, wherein the stored fields represent a plurality of data guard interval lengths supported by the access device;
A transceiver module configured to broadcast beacon frames and to communicate data with the terminal;
including.

  According to a third aspect, in the first possible implementation manner, the beacon frame comprises at least one element, a particular element of the at least one element carrying a newly added field, the particular element being , An existing element or a newly added element.

Based on the first possible implementation method of the third aspect, in the second possible implementation method, the newly added field includes an indication index value corresponding to each preset bandwidth, The indication index value represents the minimum data guard interval length of all data guard interval lengths supported by the access device within the preset bandwidth, or
The newly added field contains an indication bit of each preset data guard interval length, and the indication bit is used to indicate whether the access device supports the preset data guard interval length, or ,
The newly added field contains an indication bit of each preset data guard interval length within each preset bandwidth, and the indication bit is a preset data guard interval within the bandwidth preset by the access device. Used to indicate if the length is supported.

According to a third aspect, in a third possible implementation method, the access device is configured to encapsulate the beacon frame separately into a first standard protocol data unit and a second standard protocol data unit. Further include an encapsulated module,
The transceiver module is specifically configured to broadcast a beacon frame encapsulated in a first standard protocol data unit and a beacon frame encapsulated in a second standard protocol data unit.

Based on the third possible implementation method of the third aspect, in the fourth possible implementation method, the plurality of data guard interval lengths supported by the access device are supported by the access device in the first standard. The encapsulation module includes a data guard interval length and a data guard interval length supported by the access device in the second standard;
First configured to obtain the maximum data guard interval length in the data guard interval length supported by the access device in the first standard, and to determine the maximum data guard interval length as the first alternative data guard interval length Acquisition unit, and
A second standard configured to obtain the maximum data guard interval length in the data guard interval length supported by the access device in the second standard and to determine the maximum data guard interval length as the second alternative data guard interval length. Acquisition unit, and
Encapsulation configured to separately encapsulate a beacon frame into a first standard protocol data unit and a second standard protocol data unit with a first alternative data guard interval length and a second alternative data guard interval length Unit,
including.

  According to a fourth possible implementation method of the third aspect, in the fifth possible implementation method, the first standard protocol data unit includes preamble and bearer data, and the bearer data includes beacon frames. The guard interval length of the preamble and the guard interval length of the bearer data are the first alternative data guard interval length.

Based on the fourth possible implementation method of the third aspect, in the sixth possible implementation method, the second standard protocol data unit comprises: a legacy preamble, a high efficiency wireless local area network preamble, and bearer data The guard interval length of the legacy preamble, the guard interval length of the high efficiency wireless local area network preamble, and the guard interval length of the bearer data are respectively the second alternative data guard interval length, or
The second standard protocol data unit includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, and the guard interval length of the legacy preamble is the first alternative data guard interval length, and the high efficiency wireless local area The guard interval length of the network preamble and the guard interval length of the bearer data are the second alternative data guard interval length, or
The second standard protocol data unit includes a high efficiency wireless local area network preamble and bearer data, and the guard interval length of the high efficiency wireless local area network preamble and the guard interval length of the bearer data are both the second alternative data guard interval It is a long.

In a seventh possible implementation manner based on the fourth possible implementation manner of the third aspect, the access device is:
Further including a processing module configured to add to the first standard protocol data unit an operation field used to indicate the transmission time of the second standard protocol data unit;
The transceiver module is specifically configured to broadcast the first standard protocol data unit including the operation field for a preset time period,
The transceiver module is further configured to broadcast the second standard protocol data unit at the transmission time indicated by the operation field.

A fourth aspect of the invention provides a terminal, the terminal comprising
A transceiver module configured to obtain a beacon frame broadcast by an access device, wherein the beacon frame includes a newly added field, the newly added field being a plurality of access device supported A transceiver module representing a data guard interval length;
A selection module configured to select an available guard interval length that matches the data guard interval length supported by the terminal from a plurality of data guard interval lengths supported by the access device;
Including
The transceiver module is further configured to communicate data with the access device by using the available guard interval length.

  According to a fourth aspect, in the first possible implementation manner, the beacon frame is encapsulated in a first standard protocol data unit and a second standard protocol data unit, and the access device is preset , And transmits the first standard protocol data unit, the first standard protocol data unit includes an operation field used to indicate the transmission time of the second standard protocol data unit.

Based on the first possible implementation method of the fourth aspect, in the second possible implementation method, the transceiver module obtains a first standard protocol data unit broadcast by the access device, and Specifically configured to parse beacon frames from standard protocol data units, or
The transceiver module is specifically configured to obtain the second standard protocol data unit broadcast by the access device and to analyze the beacon frame from the second standard protocol data unit, or
The transceiver module obtains the first standard protocol data unit broadcasted by the access device, determines the transmission time of the second standard protocol data unit from the operation field in the first standard protocol data unit, and The two standard protocol data units are obtained and specifically configured to analyze the beacon frame from the second standard protocol data unit.

In an embodiment of the present invention, the access device constructs a beacon frame, the beacon frame includes a newly added field, and the newly added field represents a plurality of data guard interval lengths supported by the access device, The access device broadcasts the constructed beacon frame, and the terminal selects from the beacon frames broadcast by the access device an available guard interval length that matches the data guard interval length supported by the terminal, and available guard intervals Communicate with the access device by using the length. In this implementation method, in the standard that proposes a plurality of data guard interval lengths, in order to execute data communication between the access device and the terminal normally, a plurality of data guard interval lengths supported by the access device are beacon frames. May be encapsulated in the newly added field of.

  BRIEF DESCRIPTION OF DRAWINGS To describe the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the attached drawings in the following description show only some embodiments of the present invention, and those skilled in the art can obtain other drawings from these attached drawings without spending creative effort. Can.

FIG. 7 is a diagram showing an application scenario of the data communication method according to the present invention. 2 is a schematic flowchart of a data communication method according to the present invention. 7 is a schematic flowchart of another data communication method according to the present invention. 7 is a schematic flowchart of still another data communication method according to the present invention. 7 is a schematic flowchart of still another data communication method according to the present invention. FIG. 5 is a schematic block diagram of a newly added element according to the present invention. FIG. 7 is a schematic block diagram of another newly added element according to the present invention. It is a table | surface of data GI length which AP supports in HEW standard. It is another table of data GI length which AP supports in HEW standard. It is an index value correspondence table according to the present invention. FIG. 5 is a schematic block diagram of a newly added field according to the present invention. It is a table for demonstrating the newly added field by this invention. FIG. 6 is a schematic block diagram of another newly added field according to the present invention. It is another table | surface for demonstrating the newly added field by this invention. It is another table of data GI length which AP supports in HEW standard. FIG. 6 is a schematic block diagram of yet another newly added field according to the present invention. It is yet another table for explaining newly added fields according to the present invention. It is yet another table for explaining newly added fields according to the present invention. It is an encapsulation format of PPDU1 in 802.11ac standard. Fig. 6 is an encapsulation format of PPDU 2 according to the present invention. It is a table | surface for demonstrating each field in PPDU2 by this invention. 7 is another encapsulation format of PPDU 2 according to the present invention. It is another table for describing each field in PPDU 2 according to the present invention. It is another encapsulation format of PPDU 2 according to the present invention. It is yet another table for explaining each field in PPDU 2 according to the present invention. FIG. 5 illustrates a broadcast method of PPDU 1 and PPDU 2 according to the present invention. FIG. 6 illustrates another broadcasting method of PPDU 1 and PPDU 2 according to the present invention. FIG. 1 is a schematic block diagram of an access device according to the present invention. Fig. 2 is a schematic block diagram of an encapsulation module according to the present invention. FIG. 2 is a schematic block diagram of a terminal according to the present invention. FIG. 7 is a schematic block diagram of another access device according to the present invention; It is a schematic block diagram of another terminal of the present invention.

  Hereinafter, technical solutions in the embodiments of the present invention will be clearly described with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only some but not all of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without spending creative effort shall fall within the protection scope of the present invention.

  The access device may be an access point (AP), also referred to as a wireless access point, hotspot or the like. The AP is an access point through which mobile users enter the wired network, and the AP is mainly located in homes or buildings and parks, with typical coverage radius of tens to hundreds of meters, Of course, you may expand outdoors. An AP corresponds to a bridge that connects a wired network and a wireless network. The main function of the AP is to connect all wireless network clients and connect the wireless network to Ethernet. Currently, the standard that AP mainly uses is the IEEE (Institute of Electrical and Electronics Engineers) 802.11 family. Specifically, the AP may be a terminal device or a network device having a WiFi chip. Optionally, the AP may be a device supporting the 802.11ax standard, and further optionally, the AP comprises 802.11ac, 802.11n, 802.11g, 802.11b, and 802. It may be an apparatus that supports multiple WLANs (wireless local area networks), such as 11a.

  The terminal may be a wireless communication chip, a wireless sensor, or a wireless communication terminal. For example, the terminal may be a mobile phone supporting wireless fidelity (WiFi) communication function, a tablet computer supporting WiFi communication function, a set top box supporting WiFi communication function, or a computer supporting WiFi communication function. Good. Optionally, the terminal may support the 802.11ax standard, and further optionally, the terminal is such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a Multiple WLAN standards may be supported.

  In the prior art, for example, the 802.11ac standard, the data GI length used in the process of data communication between the AP and the STA is 0.8 us. The HEW standard proposes more options for data GI lengths, including data GI lengths such as 0.4 us, 0.8 us, 1.2 us, 1.6 us, 2.4 us, 3.2 us and so on. Therefore, the prior art fixed data GI length can not be adapted to data communication between AP and STA with the new HEW standard. As shown in FIG. 1, if the AP supports the HEW standard STA2 and STA3 and the 802.11ac standard STA1 and if a data GI length of 0.8us is used between the AP and the STA, then STA1 Since STA2 and STA2 fall within the coverage area of 0.8 us, STA1 and STA2 can perform data communication with the AP. However, STA3 can not communicate data with the AP because it exceeds 0.8 us of the coverage area.

  Embodiments of the present invention may be applied to the application scenario of FIG. The AP broadcasts a beacon frame to all STAs, where the beacon frame carries a newly added field, and the newly added field is used to represent multiple data GI lengths that the AP supports However, when the AP receives a beacon frame broadcast by the AP, the terminal analyzes a plurality of data GI lengths supported by the AP, and a data GI length matching the data GI length supported by the terminal is This is to select as the data GI length used for data communication between the terminal and the AP. Therefore, in the embodiment of the present invention, data communication between the AP and the STA can be normally performed in the case of multiple data GI lengths proposed in the HEW standard.

  Referring to FIG. 2, FIG. 2 is a data communication method according to an embodiment of the present invention. As shown in FIG. 2, the data communication method of the present embodiment includes steps S100 to S101.

  S100. The access device constructs a beacon frame, the beacon frame includes a newly added field, and the newly added field represents a plurality of data guard interval lengths supported by the access device.

  In a particular embodiment, the data GI lengths supported by the new generation standard solution HEW currently being studied by the standardization group are {0.4 us, 0.8 us, 1.6 us, 2.4 us, 3.2 us}, The access device is a wireless access point (AP). In the present invention, in order for the AP to better indicate the data GI length information, the newly added field is added to the beacon frame by being referred to as the "HE compatible GI" field, and the newly added field is supported by the AP. Used to represent multiple GI lengths. The “HE compatible GI” is used to exchange data GI lengths supported by each of the AP and STA between the AP and the STA. In the following, a detailed description will be provided separately in aspects such as the location of the "HE enabled GI" field and the format of the "HE enabled GI" field.

  The "HE compatible GI" field can be placed at any position in the beacon frame. For example, the fields may be located in existing elements of the beacon frame or may be located in newly added elements created in the beacon frame. In addition, the field may be placed in the SIG field of a physical layer presentation protocol data unit (PPDU) frame carrying a beacon frame. In the following, we will consider the case of creating a newly added element in order to place the "HE enabled GI" field. The newly created element is called an HE ability element. In this case, the “HE compatible GI” field may be arranged as follows.

  In the first alternative implementation, the 'HE enabled GI' field is placed directly on the 'HE capability' element and the 'HE capability' information element describes the selective capability of the AP to support the WLAN solution Contains fields used for The "HE enabled GI" field may, for example, be placed in the "HE Capability" element and be arranged in a manner as shown in FIG.

  In a second alternative implementation, the "HE enabled GI" field is placed in the field of the "HE Capability" element. As shown in FIG. 7, the "HE Capability" element includes a "HE Capability Information" field, which is used to indicate capability information of the AP. The "HE compatible GI" field may be placed in the above "HE capability information" field.

  In the present invention, the newly added field, that is, the "HE compatible GI" field indicates the data GI length supported by the AP, and in the new generation standard HEW solution, the bandwidth supported by the AP is 20 MHz, 40 MHz, 80 MHz Or 160 MHz. As shown in FIG. 8, there are multiple GI lengths in various bandwidths. The data GI length supported by the AP is N (N = 1, 2, 3,..., 32) × 0.4 us in length. The "HE compatible GI" field can be expressed in a plurality of ways. In the following, although several representation methods are used separately as an illustrative example, it should be noted that the present specification is not limited to a specific representation method.

In a first alternative implementation, the newly added field contains an indication index value corresponding to each preset bandwidth, and the indication index value is within the preset bandwidth by the access device. It represents the minimum data guard interval length for all supported data guard interval lengths, and the preset bandwidth may include 20 MHz, 40 MHz, 80 MHz, and 160 MHz. For ease of explanation, the specific representation method randomly selects M data GI lengths from all data GI lengths supported by various bandwidths shown in the table of FIG. 8 as GI lengths supported by AP. It may be a selection, as shown in FIG. N is a serial number, and the value of N is {1, 2,. . . , M}, m represents the bit amount of the instruction bit, and N corresponds to the value of the instruction bit on a one-to-one basis. Assuming that six data GI lengths are selected, M = 6, N = {1, 2
,. . . , 6} and m = 3, and the relationship between N and the instruction bit is as shown in FIG. To simplify the explanation, assuming that the AP does not support some data GI lengths, "-" indicates that the AP in the corresponding bandwidth does not support that GI length.

  Assuming that the minimum data GI length supported by the AP is min_GI, the index value corresponding to min_GI is N, and various bandwidths correspond to one min_GI. The relationship between the min_GI, which is supported by the AP with various bandwidths, and the min_GI obtained according to FIG. 9 and the serial number and the indication bit is shown in FIG.

  The indication index value included in the "HE compatible GI" field refers to the index value corresponding to min_GI indicated by the "HE compatible GI" field in various bandwidths. The index value corresponding to the min_GI indicated by the "HE enabled GI" field at various bandwidths refers to the serial number supported by the AP in each bandwidth and corresponding to the "HE enabled GI" and the min_GI carried by the field. . For example, the data GI length supported in a 20 MHz bandwidth is {0.8 us, 1.2 us, 1.6 us, 2.0 us, 2.4 us, 2.8 us, 3.2 us}. If min_GI supported in a 20 MHz bandwidth is 0.8 us, then the 20 MHz serial number indicator index value is 2. To process 40 MHz, 80 MHz and 160 MHz, reference is made to 20 MHz processing. Specifically, the indicator index value of the "HE compatible GI" field in the beacon frame is represented in binary encoded form, ie, in the form of an indicator bit, and a specific representation form is shown in FIG. The “HE compatible GI” field includes an indication index value of each preset bandwidth, and the indication index value GI_Idx is represented by bit information. A particular bit information representation is shown in FIG.

  In a second alternative implementation, the newly added field includes an indication bit of each preset data guard interval length, and the indication bit indicates whether the access device supports the preset data guard interval length. Used to indicate. In this mounting method, the influence of the bandwidth is not taken into consideration, and M data GI lengths are selected as preset data GI lengths from the data GI lengths shown in FIG. For example, the preset data GI length is {0.4 us, 0.8 us, 1.2 us, 1.6 us, 2.0 us, 2.4 us, 2.8 us, 3.2 us}.

  The "HE compatible GI" field uses an indication bit to indicate whether the AP supports the preset data GI length. The "HE compatible GI" field may use a single indication bit to indicate each data GI length in all preset data GI lengths, and each bit information bit indicates one data GI length. The representation method of the “HE compatible GI” field is shown in FIG. 13, where one bit indicates one data GI length. Specific bit information instructions are shown in FIG.

  In a third alternative implementation, the newly added fields include an indication bit of each preset data guard interval length within each preset bandwidth, and the indication bit is preset by the access device Used to indicate whether to support preset data guard interval length within the bandwidth. In this embodiment, as shown in FIG. 15, M data GI lengths are randomly selected from all the data GI lengths shown in FIG. 8 and supported in various bandwidths as data GI lengths supported by AP. But here M = 5. The fact that the "HE enabled GI" field indicates the data GI length supported by each bandwidth means that the "HE enabled GI" field uses a single bit indicator bit to indicate the data GI length supported by the AP. That is, each bit separately indicates the data GI length supported by various bandwidths, and the representation form of the "HE compatible GI" field is shown in FIG. Specific bit information is shown in FIGS. 17A and 17B.

S101. In order for the terminal to be able to communicate data with the access device by selecting from the beacon frame an available guard interval length that matches the data guard interval length supported by the terminal and using the available guard interval length The access device broadcasts a beacon frame.

  In particular embodiments, the access device may broadcast the constructed beacon frame, and the particular broadcast method may encapsulate the beacon frame in PPDU format for broadcast. There may be multiple PPDU format encapsulation methods. For example, beacon frames may be encapsulated in PPDU 1 by existing standard 802.11ac, or by new generation standard HEW so that terminals supporting new generation standard HEW can identify and analyze PPDU 2 Although another encapsulation scheme may be created to encapsulate the beacon frame in PPDU 2, see the description of FIG. 3 for a specific creation method.

  When a terminal STA1 supporting the 802.11ac standard and a terminal STA2 supporting the new generation standard HEW coexist within the broadcast range, the access device AP encapsulates so that both STA1 and STA2 can access the network. It is necessary to broadcast PPDU 1 and PPDU 2 that have been sent. The broadcast method of PPDU 1 may be to broadcast PPDU 1 for a specific period preset by the existing standard. Although the operation field may be added to PPDU 1 to broadcast PPDU 2, the operation field may indicate the broadcast time of PPDU 2 so as to broadcast PPDU 2 at the time indicated by the operation field.

  After receiving the beacon frame broadcast by the AP and encapsulating it in PPDU1 format, STA1 accesses the network according to the existing 802.11ac standard. After detecting PPDU1 and / or PPDU2, STA2 analyzes the beacon frame, analyzes each capability element of the beacon frame, analyzes the "HE corresponding GI" field of the capability element, and supports the data GI length supported by the AP. get. Although STA2 acquires available data GI length used for communication with AP by data GI length supported by STA2, the available data GI length matches the data GI length supported by STA2, And refers to the data GI length in the data GI length supported by the AP. For example, data GI lengths supported by STA2 are {0.8 us, 1.6 us, 2.4 us, 3.2 us}, and data GI lengths supported by AP are {0.4 us, 0.8 us, 1.6 us , 2.0 us, 2.4 us, 3.2 us}. The data GI lengths supported by both AP and STA2 are {0.8 us, 1.6 us, 2.4 us, 3.2 us}, in this case {0.8 us, 1.6 us, 2.4 us, The available data GI length is 3.2 us}. Subsequently, STA2 performs data communication with the AP by using selectable data GI lengths, but specifically, STA2 selects data GI lengths according to channel conditions from available GI lengths, Data communication with the AP may be performed.

  In this embodiment of the present invention, the access device constructs a beacon frame, the beacon frame includes newly added fields, and the newly added fields represent a plurality of data guard interval lengths supported by the access device. The access device broadcasts the constructed beacon frame, and the terminal selects an available guard interval length matching the data guard interval length supported by the terminal from the beacon frame broadcast by the access device, and the available guard Communicate with the access device by using the interval length. In this embodiment, in the standard proposing a plurality of data guard interval lengths, a plurality of data guard interval lengths supported by the access device in order to execute data communication between the access device and the terminal normally are beacon frames. May be encapsulated in the newly added field of.

  Referring to FIG. 3, FIG. 3 is another data communication method according to an embodiment of the present invention. As shown in FIG. 3, the data communication method of the present embodiment includes steps S200 to S202.

S200. The access device constructs a beacon frame, the beacon frame includes a newly added field, and the newly added field represents a plurality of data guard interval lengths supported by the access device.

  S201. The access device encapsulates the beacon frame separately into a first standard protocol data unit and a second standard protocol data unit.

  In a particular embodiment, consider the case where STAs supporting a first standard and STAs supporting a second standard co-exist on the network. For example, STA1 supports a first standard and STA2 supports a second standard. The first standard or second standard above is a different WIFI solution, which may be an existing WIFI standard solution such as 802.11ac, or a new generation standard solution HEW currently being studied by the standardization group Or another similar WIFI solution.

  When encapsulating a beacon frame in PPDU format, the access device AP needs to encapsulate the beacon frame in two PPDU formats, a first standard protocol data unit PPDU1 and a second standard protocol data unit PPDU2. PPDU1 is obtained by encapsulation according to the first standard, and PPDU2 is obtained by encapsulation according to the second standard. Although the specific encapsulation method will be described in detail below, specifically, steps S20 to S22 are included.

  S20. The access device obtains the maximum data guard interval length from the data guard interval length supported by the access device in the first standard, and determines the maximum data guard interval length as the first alternative data guard interval length.

  In particular embodiments, the AP separately supports a set of data GI lengths in the first and second standards. The first alternative data GI length refers to the maximum data GI length in a set of GIs that the AP supports in the first standard. For example, assuming that the data GI length supported by the first standard AP is {0.4 us, 0.8 us}, the first alternative data GI length refers to the data GI length of 0.8 us.

  S21. The access device obtains the maximum data guard interval length from the data guard interval length supported by the access device in the second standard, and determines the maximum data guard interval length as the second alternative data guard interval length.

  In a particular embodiment, the AP also supports a second set of data GI lengths of the second standard, and the second alternative data guard interval length is the maximum data of the set of GIs that the AP supports in the second standard. Refer to GI length. For example, if a set of data GI lengths supported by AP in the second standard is {0.4 us, 0.8 us, 1.6 us, 2.4 us, 3.2 us}, the second alternative data GI is Refer to the data length of 3.2us.

If there are more varieties of STAs supporting different standards in the network, ie there are multiple types of STAs, then different types of STAs support different standards but STAs supporting different standards It should be noted that there may be compatibility between. However, STA has only forward compatibility instead of backward compatibility. For example, STAs that support HEW are compatible with STAs that support the 802.11ac standard, but STAs that support the 802.11ac standard are not compatible with STAs that support the HEW. For example, when there are multiple types of STAs on the network, the number of different standards supported by the various STAs in the network is three, four or more, and alternative data GI lengths are correspondingly determined In this case, the number of alternative data GI lengths is correspondingly 3, 4 or more. For ease of explanation, assuming that two STAs present in the network support the first standard (such as 802.11ac standard solution) and the second standard (such as current HEW standard solution) respectively: The contents of the present invention will be described in the following, but the substitute data GI lengths are GI1 and GI2.

  S22. The access device encapsulates the beacon frame separately into a first standard protocol data unit and a second standard protocol data unit according to the first alternative data guard interval length and the second alternative data guard interval length.

  In a particular embodiment, the access device is configured to transmit the beacon frame, the first standard protocol data unit PPDU 1 and the second standard protocol data according to the first alternative data guard interval length GI1 and the second alternative data guard interval length GI2. Although encapsulated in unit PPDU 2, the constructed PPDU 1 and PPDU 2 need to conform to the PPDU format in their respective standards. The formats of PPDU 1 and PPDU 2 will be separately described below.

  As shown in FIG. 18, optionally, PPDU1 format includes preamble and bearer data, bearer data includes beacon frame, and preamble GI length and data GI length in PPDU1 format are GI1 respectively. The purpose of the AP to send PPDU 1 is to make STA 1 supporting the first standard network discoverable. The first standard may be the 802.11ac standard.

  Optionally, the second standard may be a HEW standard. Referring to the HEW standard, PPDU 2 format has multiple design methods, but is not limited thereto. The following shows the design of three alternative PPDU 2 formats.

  As shown in FIG. 19, in the first alternative implementation method, PPDU 2 includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, and is a combination of L-STF, L-LTF and L-SIG. Is referred to as the legacy preamble, and the combination of HE-SIG, HE-STF, and another possible field is referred to as the HEW preamble. The GI length of the legacy preamble, the GI length of the HEW preamble, and the GI length of the bearer data are GI2 respectively. The purpose of the AP to send PPDU 2 is to make STA 2 supporting the second standard network discoverable. Note that STA2 can also detect PPDU1 and process PPDU1. A description of all the fields of FIG. 19 is shown in FIG.

  As shown in FIG. 21, in the second selective implementation method, the PPDU 2 format includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, and the GI length of the legacy preamble is GI1, and the HEW preamble The GI length of and the GI length of the bearer data are GI2 respectively. The purpose of the AP to send PPDU 2 is to make STA 2 supporting the second standard network discoverable. The length of the legacy preamble of PPDU 2 format in the first alternative implementation method obtained from FIG. 20 is 80 us. The length of the legacy preamble of PPDU 2 format in the second selective implementation method obtained from FIG. 22 is 20 us. If the lengths of the remaining fields are the same, in the second alternative implementation, the transmission overhead is reduced by 60 us. A description of all the fields of FIG. 21 is shown in FIG.

In a third alternative implementation, the PPDU 2 format is shown in FIG. 23, where PPDU 2 includes high efficiency wireless local area network preamble and bearer data. A description of all the fields of FIG. 23 is shown in FIG. The GI length of the HEW preamble and the GI length of the bearer data are respectively GI2, and the purpose of the AP to transmit PPDU2 is to make the STA2 supporting the second standard network discoverable. Compared to the PPDU format in the first alternative implementation way, the PPDU format in the third alternative implementation way removes the legacy preamble. Thus, if the length of the remaining fields is the same, the transmission overhead is reduced by 80 us as compared to the PPDU format in the first alternative implementation manner.

  S202. The access device broadcasts a beacon frame encapsulated in a first standard protocol data unit and a beacon frame encapsulated in a second standard protocol data unit.

  In a particular embodiment, the access device broadcasts the beacon frame encapsulated in PPDU 1 and the beacon frame encapsulated in PPDU 2, but the specific broadcasting method broadcasts PPDU 1 during a preset time period and identifies The PPDU 2 may be broadcast at a broadcast time of However, it is necessary to add an operation field indicating the transmission time of PPDU 2 to PPDU 1.

  In this embodiment of the present invention, the access device constructs a beacon frame, the beacon frame includes newly added fields, and the newly added fields represent a plurality of data guard interval lengths supported by the access device. The access device broadcasts the constructed beacon frame, and the terminal selects an available guard interval length matching the data guard interval length supported by the terminal from the beacon frame broadcast by the access device, and the available guard Communicate with the access device by using the interval length. In this embodiment, in the standard proposing a plurality of data guard interval lengths, a plurality of data guard interval lengths supported by the access device in order to execute data communication between the access device and the terminal normally are beacon frames. May be encapsulated in the newly added field of.

  Referring to FIG. 4, FIG. 4 is another data communication method according to an embodiment of the present invention. As shown in FIG. 4, the data communication method of the present embodiment includes steps S300 to S304.

  S300. The access device constructs a beacon frame, the beacon frame includes a newly added field, and the newly added field represents a plurality of data guard interval lengths supported by the access device.

  S301. The access device encapsulates the beacon frame separately into a first standard protocol data unit and a second standard protocol data unit.

  S302. The access device adds an operation field used to indicate the transmission time of the second standard protocol data unit to the first standard protocol data unit.

  In a particular embodiment, the AP sends constructed PPDU 1 and PPDU 2. Assuming that PPDU 1 is constructed according to the 802.11ac standard, the transmission period of PPDU 1 specified in the 802.11ac standard is T1, and the transmission time of PPDU 2 by the AP may be specified randomly, and the AP For example, transmit PPDU 1 and PPDU 2 alternately. A calculation field may be added to PPDU 1 for display, and a calculation field may be added to PPDU 2 for display. The operation field is used to indicate the transmission time of PPDU 2. The operation field may indicate the transmission time of PPDU 2 by a plurality of display methods, but only two methods are described below.

In the first alternative implementation, the HE operation field uses only one bit to indicate whether the next m * T (e.g. m = 2/3) period has PPDU 2 but here , T is a preset period for broadcasting PPDU 1. That is, if the value of the HE operation field is 1, it indicates that the next m * T period has PPDU 2; if the value of the HE operation field is 0, the next m * T period does not have PPDU 2 Indicates that. As shown in FIG. 25, the value of the HE operation field of the first PPDU 1 from the left is 1, indicating that the next m * T period has PPDU 2, and the value of the HE operation field of the second PPDU 1 is As it is 0, the next m * T period does not have PPDU2.

  In a second alternative implementation, the HE operation field has two or more bits indicated as x bits. The HE operation field may be used to indicate whether the next (n + m * T) (e.g., m = 2/3, n is a natural number indicated by x bits) period has PPDU 2 or not. That is, when the value of the HE operation field is n, it indicates that the next (n + m * T) period has PPDU2. As shown in FIG. 26, since the value of the HE operation field of the first PPDU 1 from the left is 1, it indicates that the next m * T period has PPDU 2, and the value of the HE operation field of the second PPDU 1 is As it is 2, the next two m * T periods have PPDU2.

  S303. The access device broadcasts a first standard protocol data unit including the operation field for a preset period.

  In a particular embodiment, the access device broadcasts PPDU 1 including the operation field at a particular preset time period. PPDU 1 may be encapsulated by the 802.11ac standard, and thus PPDU 1 may be broadcast by a preset time period in the 802.11ac standard.

  S304. The access device broadcasts the second standard protocol data unit at the transmission time indicated by the operation field.

  In particular embodiments, as shown in FIG. 25 or 26, the access device broadcasts PPDU 2 at the transmission time indicated by the operation field. Upon receiving PPDU 1, the terminal may know the transmission time of PPPDU 2 by the operation field, and may receive PPDU 2 at the known transmission time.

  In this embodiment of the present invention, the access device constructs a beacon frame, the beacon frame includes newly added fields, and the newly added fields represent a plurality of data guard interval lengths supported by the access device. The access device broadcasts the constructed beacon frame, and the terminal selects an available guard interval length matching the data guard interval length supported by the terminal from the beacon frame broadcast by the access device, and the available guard Communicate with the access device by using the interval length. In this embodiment, in the standard proposing a plurality of data guard interval lengths, a plurality of data guard interval lengths supported by the access device in order to execute data communication between the access device and the terminal normally are beacon frames. May be encapsulated in the newly added field of.

  Referring to FIG. 5, FIG. 5 is another data communication method according to an embodiment of the present invention. As shown in FIG. 5, the data communication method of the present embodiment includes steps S400 to S402.

  S400. The terminal obtains a beacon frame broadcast by the access device, but the beacon frame includes a newly added field, and the newly added field represents a plurality of data guard interval lengths supported by the access device.

In a particular embodiment, the terminal STA obtains a beacon frame broadcast by the access device, but the beacon frame may be a beacon frame, and the beacon frame includes a newly added field and is newly added. The field represents a plurality of data GI lengths supported by the access device. The processing procedure of the STA corresponds to the processing procedure of the access device AP described above. The AP side encapsulates the beacon frame into a first standard protocol data unit PPDU1 and a second standard protocol data unit PPDU2, but the first standard may be the 802.11ac standard, the second standard is It may be HEW standard. In this embodiment, if there is a STA1 supporting the first standard and a STA2 supporting the second standard on the network, STA1 can perform normal detection processing only in PPDU1. For the detection processing method, although not detailed here, please refer to the 802.11ac standard solution. The STA processing procedure described here refers to the processing procedure of the STA 2 described above.

  The AP transmits PPDU1 in a preset period, but PPDU1 includes an operation field used to indicate the transmission time of PPDU2, and the operation field indicates the transmission time of PPDU2. Specifically, there are three alternative implementations of the method that the STA uses to obtain the beacon frame broadcast by the AP.

  In the first alternative implementation method, when the STA acquires PPDU1 broadcasted by the AP, the STA processes PPDU1 and analyzes the beacon frame from PPDU1 and at the same time in data communication between the STA and AP thereafter. The preamble length is determined by the PPDU 1 preamble. For example, if the preamble of PPDU1 is GI1, the STA sets the preamble in subsequent data communication to GI1.

  In the second alternative implementation method, when the STA acquires PPDU 2 broadcasted by AP, the STA processes PPDU 2 and analyzes the beacon frame from PPDU 2 at the same time as data communication between the STA and AP thereafter. The preamble length is determined by the PPDU 2 preamble. For example, if the preamble of PPDU 2 is GI 2, the STA sets the preamble in subsequent data communication to GI 2.

  In a third alternative implementation, when the STA receives PPDU 1, the STA obtains the next PPDU 2 transmission time from PPDU 1 by parsing the “HE-Operation” field. For example, if "HE operation" uses a bit to indicate whether the next period has PPDU 2, if the "HE operation" field indicates 0, then the STA needs to detect PPDU 2 in the next period. If it indicates that there is one, or if the “HE operation” field indicates 1, it indicates that the STA does not need to detect PPDU 2 in the next period. The STA analyzes the beacon frame from the detected PPDU 2. Furthermore, the STA determines the preamble length in the subsequent data communication between the STA and the AP according to the PPDU 2 preamble. For example, if the preamble of PPDU 2 is GI 2, the STA sets the preamble in subsequent data communication to GI 2.

  S401. The terminal selects an available guard interval length that matches the data guard interval length supported by the terminal from a plurality of data guard interval lengths supported by the access device.

In a particular embodiment, the terminal STA analyzes the beacon frame after acquiring the beacon frame. The specific analysis method is that the STA detects all capability elements of the beacon frame and obtains the data GI length supported by the AP by analyzing the "HE enabled GI" field, and the STA supports the STA. The available GI length may be set based on the data GI length and the acquired data GI length supported by the AP. For example, if the data GI length indicated by the information on the "HE compatible GI" field is {0.8 us, 1.6 us, 2.4 us}, the data GI length supported by the AP is {0.8 us, 1.6 us , 2.4 us}. The GI length supported by the STA itself is {0.4 us, 0.8 us, 1.6 us, 2.4 us, 3.2 us}. The data GI lengths supported by both AP and STA2 are {0.8 us, 1.6 us}, and in this case, {0.8 us, 1.6 us} is the available data GI length. In the subsequent communication between the STA and the AP, the data GI length is selected from the available data GI lengths according to the channel conditions to construct a PPDU.

  S402. The terminal communicates data with the access device by using the available guard interval length.

  In particular embodiments, after obtaining the available data GI length, the STA may perform data communication with the AP by using the available data GI length. Specifically, in the subsequent communication between the STA and the AP, the data GI length is selected from the available data GI lengths according to the channel state to construct a PPDU.

  Furthermore, the STA generates an association request frame with the available data GI length, and transmits the association request frame to the AP. After receiving the association request frame, the AP analyzes the association request frame and returns an association response frame to the STA if the STA is authorized to access the network. After receiving the association response frame, the STA analyzes the association response frame. In this case, the STA establishes an association with the AP, and then the AP and STA may perform data communication for data transmission.

  In this embodiment of the present invention, the access device constructs a beacon frame, the beacon frame includes newly added fields, and the newly added fields represent a plurality of data guard interval lengths supported by the access device. The access device broadcasts the constructed beacon frame, and the terminal selects an available guard interval length matching the data guard interval length supported by the terminal from the beacon frame broadcast by the access device, and the available guard Communicate with the access device by using the interval length. In this embodiment, in the standard proposing a plurality of data guard interval lengths, a plurality of data guard interval lengths supported by the access device in order to execute data communication between the access device and the terminal normally are beacon frames. May be encapsulated in the newly added field of.

  Referring to FIG. 27, FIG. 27 is a schematic structural diagram of an access device according to the present invention. As shown in FIG. 27, the access device according to the present embodiment includes a construction module 100, an encapsulation module 101, a processing module 102, and a transceiver module 103.

  The construction module 100 is configured to construct a beacon frame, but the beacon frame includes a newly added field, and the newly added field represents a plurality of data guard interval lengths supported by the access device. .

  In a particular embodiment, the data GI lengths supported by the new generation standard solution HEW currently being studied by the standardization group are {0.4 us, 0.8 us, 1.6 us, 2.4 us, 3.2 us}, The access device is a wireless access point (AP). In the present invention, in order for the AP to better indicate the data GI length information, the construction module 100 adds the newly added field to the beacon frame by referring to it as the “HE compatible GI” field, and the newly added field. Is used to represent multiple GI lengths supported by the AP. The “HE compatible GI” field is used to exchange data GI lengths supported by each of the AP and STA between the AP and the STA. In the following, a detailed description will be provided separately in aspects such as the location of the "HE enabled GI" field and the format of the "HE enabled GI" field.

The "HE compatible GI" field can be placed at any position in the beacon frame. For example, the fields may be located in existing elements of the beacon frame or may be located in newly added elements created in the beacon frame. In addition, the field may be placed in the SIG field of a physical layer presentation protocol data unit (PPDU) frame carrying a beacon frame. In the following, we will consider the case of creating a newly added element in order to place the "HE enabled GI" field. The newly created element is called an HE ability element. In this case, the “HE compatible GI” field may be arranged as follows.

  In the first alternative implementation, the 'HE enabled GI' field is placed directly on the 'HE capability' element and the 'HE capability' information element describes the selective capability of the AP to support the WLAN solution Contains fields used for The "HE enabled GI" field may, for example, be placed in the "HE Capability" element and be arranged in a manner as shown in FIG.

  In a second alternative implementation, the "HE enabled GI" field is placed in the field of the "HE Capability" element. As shown in FIG. 7, the "HE Capability" element includes a "HE Capability Information" field, which is used to indicate capability information of the AP. The "HE compatible GI" field may be placed in the above "HE capability information" field.

  In the present invention, the newly added field, that is, the "HE compatible GI" field indicates the data GI length supported by the AP, and in the new generation standard HEW solution, the bandwidth supported by the AP is 20 MHz, 40 MHz, 80 MHz Or 160 MHz. As shown in FIG. 8, there are multiple GI lengths in various bandwidths. The data GI length supported by the AP is N (N = 1, 2, 3,..., 32) × 0.4 us in length. The "HE compatible GI" field can be expressed in a plurality of ways. In the following, although several representation methods are used separately as an illustrative example, it should be noted that the present specification is not limited to a specific representation method.

  In a first alternative implementation, the newly added field contains an indication index value corresponding to each preset bandwidth, and the indication index value is within the preset bandwidth by the access device. It represents the minimum data guard interval length for all supported data guard interval lengths, and the preset bandwidth may include 20 MHz, 40 MHz, 80 MHz, and 160 MHz. For ease of explanation, the specific representation method randomly selects M data GI lengths from all data GI lengths supported by various bandwidths shown in the table of FIG. 8 as GI lengths supported by AP. It may be a selection, as shown in FIG. N is a serial number, and the value of N is {1, 2,. . . , M}, m represents the bit amount of the instruction bit, and N corresponds to the value of the instruction bit on a one-to-one basis. Assuming that six data GI lengths are selected, M = 6, N = {1, 2,. . . , 6} and m = 3, and the relationship between N and the instruction bit is as shown in FIG. To simplify the explanation, assuming that the AP does not support some data GI lengths, "-" indicates that the AP in the corresponding bandwidth does not support that GI length.

  Assuming that the minimum data GI length supported by the AP is min_GI, the index value corresponding to min_GI is N, and various bandwidths correspond to one min_GI. The relationship between the min_GI, which is supported by the AP with various bandwidths, and the min_GI obtained according to FIG. 9 and the serial number and the indication bit is shown in FIG.

The indication index value included in the "HE compatible GI" field refers to the index value corresponding to min_GI indicated by the "HE compatible GI" field in various bandwidths. The index value corresponding to min_GI indicated by the "HE compatible GI" field at various bandwidths refers to the serial number corresponding to min_GI supported in each bandwidth and carried by the "HE compatible GI" field. For example, the data GI length supported in a 20 MHz bandwidth is {0.8 us, 1.2 us, 1.6 us, 2.0 us, 2.4 us, 2.8 us, 3.2 us}. If min_GI supported in a 20 MHz bandwidth is 0.8 us, then the 20 MHz serial number indicator index value is 2. To process 40 MHz, 80 MHz and 160 MHz, reference is made to 20 MHz processing. Specifically, in the beacon frame
The indicator index value of the "HE compatible GI" field is expressed in binary encoded form, ie, in the form of the indicator bit, and the specific representation format is shown in FIG. 11, where the "HE compatible GI" field is The indicator index value GI_Idx is represented by bit information, including the indicator index value of the preset bandwidth. A particular bit information representation is shown in FIG.

  In a second alternative implementation, the newly added field includes an indication bit of each preset data guard interval length, and the indication bit indicates whether the access device supports the preset data guard interval length. Used to indicate. In this mounting method, the influence of the bandwidth is not taken into consideration, and M data GI lengths are selected as preset data GI lengths from the data GI lengths shown in FIG. For example, the preset data GI length is {0.4 us, 0.8 us, 1.2 us, 1.6 us, 2.0 us, 2.4 us, 2.8 us, 3.2 us}.

  The "HE compatible GI" field uses an indication bit to indicate whether the AP supports the preset data GI length. The "HE compatible GI" field may use a single indication bit to indicate each data GI length in all preset data GI lengths, and each bit information bit indicates one data GI length. The representation method of the “HE compatible GI” field is shown in FIG. 13, where one bit indicates one data GI length. Specific bit information instructions are shown in FIG.

  In a third alternative implementation, the newly added fields include an indication bit of each preset data guard interval length within each preset bandwidth, and the indication bit is preset by the access device Used to indicate whether to support preset data guard interval length within the bandwidth. In this embodiment, as shown in FIG. 15, M data GI lengths are randomly selected from all the data GI lengths shown in FIG. 8 and supported in various bandwidths as data GI lengths supported by AP. But here M = 5. The fact that the "HE enabled GI" field indicates the data GI length supported by each bandwidth means that the "HE enabled GI" field uses a single bit indicator bit to indicate the data GI length supported by the AP. That is, each bit separately indicates the data GI length supported by various bandwidths, and the representation form of the "HE compatible GI" field is shown in FIG. Specific bit information is shown in FIGS. 17A and 17B.

  The transceiver module 103 is configured to broadcast beacon frames and to perform data communication with the terminals.

  In a particular embodiment, the transceiver module 103 of the access device may broadcast the constructed beacon frame, and the particular broadcast method may be to encapsulate the beacon frame in PPDU format for broadcast. There may be multiple PPDU format encapsulation methods. For example, beacon frames may be encapsulated in PPDU 1 by existing standard 802.11ac, or by new generation standard HEW so that terminals supporting new generation standard HEW can identify and analyze PPDU 2 Although another encapsulation scheme may be created to encapsulate the beacon frame in PPDU 2, for the specific creation method, please refer to the description of the subsequent embodiments.

  When a terminal STA1 supporting the 802.11ac standard and a terminal STA2 supporting the new generation standard HEW coexist within the broadcast range, the access device AP encapsulates so that both STA1 and STA2 can access the network. It is necessary to broadcast PPDU 1 and PPDU 2 that have been sent. The broadcast method of PPDU 1 may be to broadcast PPDU 1 for a specific period preset by the existing standard. Although the operation field may be added to PPDU 1 to broadcast PPDU 2, the operation field may indicate the broadcast time of PPDU 2 so as to broadcast PPDU 2 at the time indicated by the operation field.

  After receiving the beacon frame broadcast by the AP and encapsulating it in PPDU1 format, STA1 accesses the network according to the existing 802.11ac standard. After detecting PPDU1 and / or PPDU2, STA2 analyzes the beacon frame, analyzes each capability element of the beacon frame, analyzes the "HE corresponding GI" field of the capability element, and supports the data GI length supported by the AP. get. Although STA2 acquires available data GI length used for communication with AP by data GI length supported by STA2, the available data GI length matches the data GI length supported by STA2, And refers to the data GI length in the data GI length supported by the AP. For example, data GI lengths supported by STA2 are {0.8 us, 1.6 us, 2.4 us, 3.2 us}, and data GI lengths supported by AP are {0.4 us, 0.8 us, 1.6 us , 2.0 us, 2.4 us, 3.2 us}. The data GI lengths supported by both AP and STA2 are {0.8 us, 1.6 us, 2.4 us, 3.2 us}, in this case {0.8 us, 1.6 us, 2.4 us, The available data GI length is 3.2 us}. Subsequently, STA2 performs data communication with the AP by using selectable data GI lengths, but specifically, STA2 selects data GI lengths according to channel conditions from available GI lengths, Data communication with the AP may be performed.

  Optionally, the access device may further include an encapsulation module 101.

  The encapsulation module 101 is configured to encapsulate the beacon frame separately into a first standard protocol data unit and a second standard protocol data unit.

  In a particular embodiment, consider the case where STAs supporting a first standard and STAs supporting a second standard co-exist on the network. For example, STA1 supports a first standard and STA2 supports a second standard. The first or second standard above is a different WIFI solution, which may be an existing WIFI standard solution such as 802.11ac, or a new generation standard solution HEW currently being considered by the standardization group There may be or another similar WIFI solution.

  When encapsulating a beacon frame into PPDU format, the encapsulation module 101 of the access device AP encapsulates the beacon frame into two PPDU formats: a first standard protocol data unit PPDU 1 and a second standard protocol data unit PPDU 2 PPDU1 is obtained by encapsulation according to the first standard, and PPDU2 is obtained by encapsulation according to the second standard. See the description of FIG. 28 for the specific encapsulation method.

  The transceiver module 103 is specifically configured to broadcast a beacon frame encapsulated in a first standard protocol data unit and a beacon frame encapsulated in a second standard protocol data unit.

  In a particular embodiment, the transceiver module 103 of the access device broadcasts the beacon frame encapsulated in PPDU 1 and the beacon frame encapsulated in PPDU 2, but the specific broadcast method broadcasts PPDU 1 for a preset period of time. It may be to broadcast and broadcast PPDU 2 at a specific broadcast time. However, it is necessary to add an operation field indicating the transmission time of PPDU 2 to PPDU 1.

  Optionally, the access device can further include a processing module 102.

The processing module 102 is configured to add an operation field used to indicate a transmission time of the second standard protocol data unit to the first standard protocol data unit.

  In a particular embodiment, the AP sends constructed PPDU 1 and PPDU 2. Assuming that PPDU 1 is constructed according to the 802.11ac standard, the transmission period of PPDU 1 specified in the 802.11ac standard is T1, and the transmission time of PPDU 2 by the AP may be specified randomly, and the AP For example, transmit PPDU 1 and PPDU 2 alternately. The processing module 102 may add the operation field to PPDU 1 for display, and may add the operation field to PPDU 2 for display. The operation field is used to indicate the transmission time of PPDU 2. The operation field may indicate the transmission time of PPDU 2 by a plurality of display methods, but only two methods are described below.

  In the first alternative implementation, the HE operation field uses only one bit to indicate whether the next m * T (e.g. m = 2/3) period has PPDU 2 but here , T is a preset period for broadcasting PPDU 1. That is, if the value of the HE operation field is 1, it indicates that the next m * T period has PPDU 2; if the value of the HE operation field is 0, the next m * T period does not have PPDU 2 Indicates that. As shown in FIG. 25, the value of the HE operation field of the first PPDU 1 from the left is 1, indicating that the next m * T period has PPDU 2, and the value of the HE operation field of the second PPDU 1 is As it is 0, the next m * T period does not have PPDU2.

  In a second alternative implementation, the HE operation field has two or more bits indicated as x bits. The HE operation field may be used to indicate whether the next (n + m * T) (e.g., m = 2/3, n is a natural number indicated by x bits) period has PPDU 2 or not. That is, when the value of the HE operation field is n, it indicates that the next (n + m * T) period has PPDU2. As shown in FIG. 26, since the value of the HE operation field of the first PPDU 1 from the left is 1, it indicates that the next m * T period has PPDU 2, and the value of the HE operation field of the second PPDU 1 is As it is 2, the next two m * T periods have PPDU2.

  The transceiver module 103 is specifically configured to broadcast the first standard protocol data unit including the operation field for a preset period of time.

  In a particular embodiment, the transceiver module 103 of the access device broadcasts a PPDU 1 that includes the operation field at a particular preset time period. PPDU 1 may be encapsulated by the 802.11ac standard, and thus PPDU 1 may be broadcast by a preset time period in the 802.11ac standard.

  The transceiver module 103 is further configured to broadcast the second standard protocol data unit at the transmission time indicated by the operation field.

  In particular embodiments, as shown in FIG. 25 or 26, the transceiver module 103 of the access device broadcasts PPDU 2 at the transmission time indicated by the operation field. Upon receiving PPDU 1, the terminal may know the transmission time of PPPDU 2 by the operation field, and may receive PPDU 2 at the known transmission time.

In this embodiment of the present invention, the access device constructs a beacon frame, the beacon frame includes newly added fields, and the newly added fields represent a plurality of data guard interval lengths supported by the access device. The access device broadcasts the constructed beacon frame, and the terminal selects an available guard interval length matching the data guard interval length supported by the terminal from the beacon frame broadcast by the access device, and the available guard Communicate with the access device by using the interval length. In this embodiment, in the standard proposing a plurality of data guard interval lengths, a plurality of data guard interval lengths supported by the access device in order to execute data communication between the access device and the terminal normally are beacon frames. May be encapsulated in the newly added field of.

  Referring to FIG. 28, FIG. 28 is a schematic structural view of an encapsulation module according to the present invention. As shown in FIG. 28, the encapsulation module of the present embodiment includes a first acquisition unit 1030, a second acquisition unit 1031, and an encapsulation unit 1032.

  The first acquisition unit 1030 acquires the maximum data guard interval length in the data guard interval length supported by the first standard access device, and determines the maximum data guard interval length as the first alternative data guard interval length Configured

  In particular embodiments, the AP separately supports a set of data GI lengths in the first and second standards. The first alternative data GI length refers to the maximum data GI length in a set of GIs that the AP supports in the first standard. For example, assuming that the data GI length supported by the first standard AP is {0.4 us, 0.8 us}, the first alternative data GI length refers to the data GI length of 0.8 us.

  The second acquisition unit 1031 acquires the maximum data guard interval length in the data guard interval length supported by the second standard access device, and determines the maximum data guard interval length as the second alternative data guard interval length. Configured

  In a particular embodiment, the AP also supports a second set of data GI lengths of the second standard, and the second alternative data guard interval length is the maximum data of the set of GIs that the AP supports in the second standard. Refer to GI length. For example, if a set of data GI lengths supported by AP in the second standard is {0.4 us, 0.8 us, 1.6 us, 2.4 us, 3.2 us}, the second alternative data GI is Refer to the data length of 3.2us.

  If there are more varieties of STAs supporting different standards in the network, ie there are multiple types of STAs, then different types of STAs support different standards but STAs supporting different standards It should be noted that there may be compatibility between. However, STA has only forward compatibility instead of backward compatibility. For example, STAs that support HEW are compatible with STAs that support the 802.11ac standard, but STAs that support the 802.11ac standard are not compatible with STAs that support the HEW. For example, when there are multiple types of STAs on the network, the number of different standards supported by the various STAs in the network is three, four or more, and alternative data GI lengths are correspondingly determined In this case, the number of alternative data GI lengths is correspondingly 3, 4 or more. For ease of explanation, assuming that two STAs present in the network support the first standard (such as 802.11ac standard solution) and the second standard (such as current HEW standard solution) respectively: The contents of the present invention will be described in the following, but the substitute data GI lengths are GI1 and GI2.

  Encapsulation unit 1032 encapsulates the beacon frame separately into the first standard protocol data unit and the second standard protocol data unit according to the first alternative data guard interval length and the second alternative data guard interval length Configured as.

In a particular embodiment, the encapsulation unit 1032 of the access device is configured to transmit beacon frames according to the first alternative data guard interval length GI1 and the second alternative data guard interval length GI2 to the first standard protocol data unit PPDU1 and the first Although encapsulated in two standard protocol data units PPDU 2, the constructed PPDU 1 and PPDU 2 need to conform to the PPDU format in their respective standards. The formats of PPDU 1 and PPDU 2 will be separately described below.

  As shown in FIG. 18, optionally, PPDU1 format includes preamble and bearer data, bearer data includes beacon frame, and preamble GI length and data GI length in PPDU1 format are GI1 respectively. The purpose of the AP to send PPDU 1 is to make STA 1 supporting the first standard network discoverable. The first standard may be the 802.11ac standard.

  Optionally, the second standard may be a HEW standard. Referring to the HEW standard, PPDU 2 format has multiple design methods, but is not limited thereto. The following shows the design of three alternative PPDU 2 formats.

  As shown in FIG. 19, in the first alternative implementation method, PPDU 2 includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, and is a combination of L-STF, L-LTF and L-SIG. Is referred to as the legacy preamble, and the combination of HE-SIG, HE-STF, and another possible field is referred to as the HEW preamble. The GI length of the legacy preamble, the GI length of the HEW preamble, and the GI length of the bearer data are GI2 respectively. The purpose of the AP to send PPDU 2 is to make STA 2 supporting the second standard network discoverable. Note that STA2 can also detect PPDU1 and process PPDU1. A description of all the fields of FIG. 19 is shown in FIG.

  As shown in FIG. 21, in the second selective implementation method, the PPDU 2 format includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, and the GI length of the legacy preamble is GI1, and the HEW preamble The GI length of and the GI length of the bearer data are GI2 respectively. The purpose of the AP to send PPDU 2 is to make STA 2 supporting the second standard network discoverable. The length of the legacy preamble of PPDU 2 format in the first alternative implementation method obtained from FIG. 20 is 80 us. The length of the legacy preamble of PPDU 2 format in the second selective implementation method obtained from FIG. 22 is 20 us. If the lengths of the remaining fields are the same, in the second alternative implementation, the transmission overhead is reduced by 60 us. A description of all the fields of FIG. 21 is shown in FIG.

  In a third alternative implementation, the PPDU 2 format is shown in FIG. 23, where PPDU 2 includes high efficiency wireless local area network preamble and bearer data. A description of all the fields of FIG. 23 is shown in FIG. The GI length of the HEW preamble and the GI length of the bearer data are respectively GI2, and the purpose of the AP to transmit PPDU2 is to make the STA2 supporting the second standard network discoverable. Compared to the PPDU format in the first alternative implementation way, the PPDU format in the third alternative implementation way removes the legacy preamble. Thus, if the length of the remaining fields is the same, the transmission overhead is reduced by 80 us as compared to the PPDU format in the first alternative implementation manner.

In this embodiment of the present invention, the access device constructs a beacon frame, the beacon frame includes newly added fields, and the newly added fields represent a plurality of data guard interval lengths supported by the access device. The access device broadcasts the constructed beacon frame, and the terminal selects an available guard interval length matching the data guard interval length supported by the terminal from the beacon frame broadcast by the access device, and the available guard Communicate with the access device by using the interval length. In this embodiment, in the standard proposing a plurality of data guard interval lengths, a plurality of data guard interval lengths supported by the access device in order to execute data communication between the access device and the terminal normally are beacon frames. May be encapsulated in the newly added field of.

  Referring to FIG. 29, FIG. 29 is a schematic block diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 29, the terminal in this embodiment of the invention includes a transceiver module 200 and a selection module 201.

  The transceiver module 200 is configured to obtain a beacon frame broadcast by the access device, but the beacon frame includes a newly added field, and the newly added field is a plurality of data supported by the access device. Represents the guard interval length.

  In a particular embodiment, the transceiver module 200 of the terminal STA obtains a beacon frame broadcast by the access device, but the beacon frame may be a beacon frame, the beacon frame including the newly added field, and the new The field added to represents a plurality of data GI lengths supported by the access device. The processing procedure of the STA corresponds to the processing procedure of the access device AP described above. The AP side encapsulates the beacon frame into a first standard protocol data unit PPDU1 and a second standard protocol data unit PPDU2, but the first standard may be the 802.11ac standard, the second standard is It may be HEW standard. In this embodiment, if there is a STA1 supporting the first standard and a STA2 supporting the second standard on the network, STA1 can perform normal detection processing only in PPDU1. For the detection processing method, although not detailed here, please refer to the 802.11ac standard solution. The STA processing procedure described here refers to the processing procedure of the STA 2 described above.

  The AP transmits PPDU1 in a preset period, but PPDU1 includes an operation field used to indicate the transmission time of PPDU2, and the operation field indicates the transmission time of PPDU2. Specifically, there are three alternative implementations of the method that the STA uses to obtain the beacon frame broadcast by the AP.

  Optionally, transceiver module 200 is specifically configured to obtain the first standard protocol data unit broadcast by the access device and to analyze the beacon frame from the first standard protocol data unit.

  In the first alternative implementation method, when the STA acquires PPDU1 broadcasted by the AP, the STA processes PPDU1 and analyzes the beacon frame from PPDU1 and at the same time in data communication between the STA and AP thereafter. The preamble length is determined by the PPDU 1 preamble. For example, if the preamble of PPDU1 is GI1, the STA sets the preamble in subsequent data communication to GI1.

  Optionally, the transceiver module 200 is specifically configured to obtain the second standard protocol data unit broadcast by the access device and to analyze the beacon frame from the second standard protocol data unit.

In the second alternative implementation method, when the STA acquires PPDU 2 broadcasted by AP, the STA processes PPDU 2 and analyzes the beacon frame from PPDU 2 at the same time as data communication between the STA and AP thereafter. The preamble length is determined by the PPDU 2 preamble. For example, if the preamble of PPDU 2 is GI 2, the STA sets the preamble in subsequent data communication to GI 2.

  Optionally, transceiver module 200 obtains the first standard protocol data unit broadcast by the access device, and determines the transmission time of the second standard protocol data unit from the operation field in the first standard protocol data unit. And specifically obtaining the second standard protocol data unit according to the transmission time, and analyzing the beacon frame from the second standard protocol data unit.

  In a third alternative implementation, when the STA receives PPDU 1, the STA obtains the next PPDU 2 transmission time from PPDU 1 by parsing the “HE-Operation” field. For example, if "HE operation" uses a bit to indicate whether the next period has PPDU 2, if the "HE operation" field indicates 0, then the STA needs to detect PPDU 2 in the next period. If it indicates that there is one, or if the “HE operation” field indicates 1, it indicates that the STA does not need to detect PPDU 2 in the next period. The STA analyzes the beacon frame from the detected PPDU 2. Furthermore, the STA determines the preamble length in the subsequent data communication between the STA and the AP according to the PPDU 2 preamble. For example, if the preamble of PPDU 2 is GI 2, the STA sets the preamble in subsequent data communication to GI 2.

  The selection module 201 is configured to select, from the plurality of data guard interval lengths supported by the access device, an available guard interval length that matches the data guard interval length supported by the terminal.

  In a particular embodiment, the terminal STA analyzes the beacon frame after acquiring the beacon frame. The specific analysis method is that the STA detects all capability elements of the beacon frame and obtains the data GI length supported by the AP by analyzing the “HE compatible GI” field, and the STA selection module 201 The available GI length may be set based on the data GI length supported by the STA and the acquired data GI length supported by the AP. For example, if the data GI length indicated by the information on the “HE compatible GI” field is {0.8 us, 1.6 us, 2.4 us}, then the data GI length supported by the AP is {0.8 us, 6 us, 2.4 us}. The GI length supported by the STA itself is {0.4 us, 0.8 us, 1.6 us, 2.4 us, 3.2 us}. The data GI lengths supported by both AP and STA2 are {0.8 us, 1.6 us}, and in this case, {0.8 us, 1.6 us} is the available data GI length. In the subsequent communication between the STA and the AP, the data GI length is selected from the available data GI lengths according to the channel conditions to construct a PPDU.

  The transceiver module 200 is further configured to perform data communication with the access device using the available guard interval length.

  In particular embodiments, after the STA has obtained the available data GI length, the transceiver module 200 may be in data communication with the AP by using the available data GI length. Specifically, in the subsequent communication between the STA and the AP, the data GI length is selected from the available data GI lengths according to the channel state to construct a PPDU.

Furthermore, the STA generates an association request frame with the available data GI length, and transmits the association request frame to the AP. After receiving the association request frame, the AP analyzes the association request frame and returns an association response frame to the STA if the STA is authorized to access the network. After receiving the association response frame, the STA analyzes the association response frame. In this case, the STA establishes an association with the AP, and then the AP and STA may perform data communication for data transmission.

  In this embodiment of the present invention, the access device constructs a beacon frame, the beacon frame includes newly added fields, and the newly added fields represent a plurality of data guard interval lengths supported by the access device. The access device broadcasts the constructed beacon frame, and the terminal selects an available guard interval length matching the data guard interval length supported by the terminal from the beacon frame broadcast by the access device, and the available guard Communicate with the access device by using the interval length. In this embodiment, in the standard proposing a plurality of data guard interval lengths, a plurality of data guard interval lengths supported by the access device in order to execute data communication between the access device and the terminal normally are beacon frames. May be encapsulated in the newly added field of.

  Referring to FIG. 30, FIG. 30 is a schematic block diagram of another access device according to the present invention. The access device 30 of FIG. 30 may be configured to implement all the steps and methods in the above method embodiments. In the embodiment of FIG. 30, access device 30 includes processor 300, transceiver 301, memory 302, antenna 303, and bus 304. The processor 300 controls the operation of the access device 30, but can also be configured to process signals. Memory 302, which may include read only memory and random access memory, provides instructions and data for processor 300. Transceiver 301 may be coupled to antenna 303. Although all the components of access device 30 are coupled together by using bus system 304, bus system 304 further includes a power bus, a control bus, and a status signal bus in addition to the data bus. However, various busses are shown as bus system 304 in the figure for clarity of illustration. The access device 30 may be the AP shown in FIG. In the following, all components are described in detail.

  The processor is configured to construct a beacon frame, but the beacon frame includes a newly added field, and the newly added field represents a plurality of data guard interval lengths supported by the access device.

  The transceiver is configured to broadcast beacon frames and to communicate data with the terminal.

  Optionally, the data GI lengths supported by the new generation standard solution HEW currently being studied by the standardization group are {0.4 us, 0.8 us, 1.6 us, 2.4 us, 3.2 us}, and access The device is a wireless access point (AP). In the present invention, in order for the AP to better indicate the data GI length information, the newly added field is added to the beacon frame by being referred to as the "HE compatible GI" field, and the newly added field is supported by the AP. Used to represent multiple GI lengths. The “HE compatible GI” field is used to exchange data GI lengths supported by each of the AP and STA between the AP and the STA. In the following, a detailed description will be provided separately in aspects such as the location of the "HE enabled GI" field and the format of the "HE enabled GI" field.

The "HE compatible GI" field can be placed at any position in the beacon frame. For example, the fields may be located in existing elements of the beacon frame or may be located in newly added elements created in the beacon frame. In addition, the field may be placed in the SIG field of a physical layer presentation protocol data unit (PPDU) frame carrying a beacon frame. In the following, we will consider the case of creating a newly added element in order to place the "HE enabled GI" field. The newly created element is called an HE ability element. In this case, the “HE compatible GI” field may be arranged as follows.

  In the first alternative implementation, the 'HE enabled GI' field is placed directly on the 'HE capability' element and the 'HE capability' information element describes the selective capability of the AP to support the WLAN solution Contains fields used for The "HE enabled GI" field may, for example, be placed in the "HE Capability" element and be arranged in a manner as shown in FIG.

  In a second alternative implementation, the "HE enabled GI" field is placed in the field of the "HE Capability" element. As shown in FIG. 7, the "HE Capability" element includes a "HE Capability Information" field, which is used to indicate capability information of the AP. The "HE compatible GI" field may be placed in the above "HE capability information" field.

  In the present invention, the newly added field, that is, the "HE compatible GI" field indicates the data GI length supported by the AP, and in the new generation standard HEW solution, the bandwidth supported by the AP is 20 MHz, 40 MHz, 80 MHz Or 160 MHz. As shown in FIG. 8, there are multiple GI lengths in various bandwidths. The data GI length supported by the AP is N (N = 1, 2, 3,..., 32) × 0.4 us in length. The "HE compatible GI" field can be expressed in a plurality of ways. In the following, although several representation methods are used separately as an illustrative example, it should be noted that the present specification is not limited to a specific representation method.

  In a first alternative implementation, the newly added field contains an indication index value corresponding to each preset bandwidth, and the indication index value is within the preset bandwidth by the access device. It represents the minimum data guard interval length for all supported data guard interval lengths, and the preset bandwidth may include 20 MHz, 40 MHz, 80 MHz, and 160 MHz. For ease of explanation, the specific representation method randomly selects M data GI lengths from all data GI lengths supported by various bandwidths shown in the table of FIG. 8 as GI lengths supported by AP. It may be a selection, as shown in FIG. N is a serial number, and the value of N is {1, 2,. . . , M}, m represents the bit amount of the instruction bit, and N corresponds to the value of the instruction bit on a one-to-one basis. Assuming that six data GI lengths are selected, M = 6, N = {1, 2,. . . , 6} and m = 3, and the relationship between N and the instruction bit is as shown in FIG. To simplify the explanation, assuming that the AP does not support some data GI lengths, "-" indicates that the AP in the corresponding bandwidth does not support that GI length.

  Assuming that the minimum data GI length supported by the AP is min_GI, the index value corresponding to min_GI is N, and various bandwidths correspond to one min_GI. The relationship between the min_GI, which is supported by the AP with various bandwidths, and the min_GI obtained according to FIG. 9 and the serial number and the indication bit is shown in FIG.

  The indication index value included in the "HE compatible GI" field refers to the index value corresponding to min_GI indicated by the "HE compatible GI" field in various bandwidths. The index value corresponding to min_GI indicated by the "HE compatible GI" field at various bandwidths refers to the serial number corresponding to min_GI supported in each bandwidth and carried by the "HE compatible GI" field. For example, the data GI length supported in a 20 MHz bandwidth is {0.8 us, 1.2 us, 1.6 us, 2.0 us, 2.4 us, 2.8 us, 3.2 us}. If min_GI supported in a 20 MHz bandwidth is 0.8 us, then the 20 MHz serial number indicator index value is 2. To process 40 MHz, 80 MHz and 160 MHz, reference is made to 20 MHz processing. Specifically, the indicator index value of the "HE compatible GI" field in the beacon frame is represented in binary encoded form, ie, in the form of an indicator bit, and a specific representation form is shown in FIG. The “HE compatible GI” field includes an indication index value of each preset bandwidth, and the indication index value GI_Idx is represented by bit information. A particular bit information representation is shown in FIG.

  In a second alternative implementation, the newly added field includes an indication bit of each preset data guard interval length, and the indication bit indicates whether the access device supports the preset data guard interval length. Used to indicate. In this mounting method, the influence of the bandwidth is not taken into consideration, and M data GI lengths are selected as preset data GI lengths from the data GI lengths shown in FIG. For example, the preset data GI length is {0.4 us, 0.8 us, 1.2 us, 1.6 us, 2.0 us, 2.4 us, 2.8 us, 3.2 us}.

  The "HE compatible GI" field uses an indication bit to indicate whether the AP supports the preset data GI length. The "HE compatible GI" field may use a single indication bit to indicate each data GI length in all preset data GI lengths, and each bit information bit indicates one data GI length. The representation method of the “HE compatible GI” field is shown in FIG. 13, where one bit indicates one data GI length. Specific bit information instructions are shown in FIG.

  In a third alternative implementation, the newly added fields include an indication bit of each preset data guard interval length within each preset bandwidth, and the indication bit is preset by the access device Used to indicate whether to support preset data guard interval length within the bandwidth. In this embodiment, as shown in FIG. 15, M data GI lengths are randomly selected from all the data GI lengths shown in FIG. 8 and supported in various bandwidths as data GI lengths supported by AP. But here M = 5. The fact that the "HE enabled GI" field indicates the data GI length supported by each bandwidth means that the "HE enabled GI" field uses a single bit indicator bit to indicate the data GI length supported by the AP. That is, each bit separately indicates the data GI length supported by various bandwidths, and the representation form of the "HE compatible GI" field is shown in FIG. Specific bit information is shown in FIGS. 17A and 17B.

  Optionally, the access device broadcasts the constructed beacon frame, and the particular broadcast method may be to encapsulate the beacon frame in PPDU format for broadcast. There may be multiple PPDU format encapsulation methods. For example, beacon frames may be encapsulated in PPDU 1 by existing standard 802.11ac, or by new generation standard HEW so that terminals supporting new generation standard HEW can identify and analyze PPDU 2 Although another encapsulation scheme may be created to encapsulate the beacon frame in PPDU 2, see the description of FIG. 3 for a specific creation method.

  When a terminal STA1 supporting the 802.11ac standard and a terminal STA2 supporting the new generation standard HEW coexist within the broadcast range, the access device AP encapsulates so that both STA1 and STA2 can access the network. It is necessary to broadcast PPDU 1 and PPDU 2 that have been sent. The broadcast method of PPDU 1 may be to broadcast PPDU 1 for a specific period preset by the existing standard. Although the operation field may be added to PPDU 1 to broadcast PPDU 2, the operation field may indicate the broadcast time of PPDU 2 so as to broadcast PPDU 2 at the time indicated by the operation field.

After receiving the beacon frame broadcast by the AP and encapsulating it in PPDU1 format, STA1 accesses the network according to the existing 802.11ac standard. After detecting PPDU1 and / or PPDU2, STA2 analyzes the beacon frame, analyzes each capability element of the beacon frame, analyzes the "HE corresponding GI" field of the capability element, and supports the data GI length supported by the AP. get. Although STA2 acquires available data GI length used for communication with AP by data GI length supported by STA2, the available data GI length matches the data GI length supported by STA2, And refers to the data GI length in the data GI length supported by the AP. For example, data GI lengths supported by STA2 are {0.8 us, 1.6 us, 2.4 us, 3.2 us}, and data GI lengths supported by AP are {0.4 us, 0.8 us, 1.6 us , 2.0 us, 2.4 us, 3.2 us}. The data GI lengths supported by both AP and STA2 are {0.8 us, 1.6 us, 2.4 us, 3.2 us}, in this case {0.8 us, 1.6 us, 2.4 us, The available data GI length is 3.2 us}. Subsequently, STA2 performs data communication with the AP by using selectable data GI lengths, but specifically, STA2 selects data GI lengths according to channel conditions from available GI lengths, Data communication with the AP may be performed.

  The processor is further configured to encapsulate the beacon frame into a first standard protocol data unit and a second standard protocol data unit.

  The transceiver is further configured to broadcast the beacon frame encapsulated in the first standard protocol data unit and the beacon frame encapsulated in the second standard protocol data unit.

  Optionally, consider the case where STAs supporting a first standard and STAs supporting a second standard co-exist on the network. For example, STA1 supports a first standard and STA2 supports a second standard. The first or second standard above is a different WIFI solution, which may be an existing WIFI standard solution such as 802.11ac, or a new generation standard solution HEW currently being considered by the standardization group There may be or another similar WIFI solution.

  When encapsulating a beacon frame in PPDU format, the access device AP needs to encapsulate the beacon frame in two PPDU formats, a first standard protocol data unit PPDU1 and a second standard protocol data unit PPDU2. PPDU1 is obtained by encapsulation according to the first standard, and PPDU2 is obtained by encapsulation according to the second standard.

  Optionally, the access device broadcasts the beacon frame encapsulated in PPDU1 and the beacon frame encapsulated in PPDU2, but the particular broadcasting method broadcasts PPDU1 for a preset period of time and It may be to broadcast PPDU 2 at broadcast time. However, it is necessary to add an operation field indicating the transmission time of PPDU 2 to PPDU 1.

  The processor is further adapted to obtain a maximum data guard interval length at a data guard interval length supported by the first standard access device, and to determine the maximum data guard interval length as a first alternative data guard interval length. Configured

  The processor is further adapted to obtain a maximum data guard interval length at a data guard interval length supported by the second standard access device, and to determine the maximum data guard interval length as a second alternative data guard interval length. Configured

  The processor is further configured to separately encapsulate the beacon frame into the first standard protocol data unit and the second standard protocol data unit according to the first alternative data guard interval length and the second alternative data guard interval length. Configured

Optionally, the AP separately supports one set of data GI lengths in the first and second standards. The first alternative data GI length refers to the maximum data GI length in a set of GIs that the AP supports in the first standard. For example, assuming that the data GI length supported by the first standard AP is {0.4 us, 0.8 us}, the first alternative data GI length refers to the data GI length of 0.8 us.

  Optionally, the AP also supports a second set of data GI lengths of the second standard, and the second alternative data guard interval length is the largest data of the set of GIs supported by the second standard AP. Refer to GI length. For example, if a set of data GI lengths supported by AP in the second standard is {0.4 us, 0.8 us, 1.6 us, 2.4 us, 3.2 us}, the second alternative data GI is Refer to the data length of 3.2us.

  If there are more varieties of STAs supporting different standards in the network, ie there are multiple types of STAs, then different types of STAs support different standards but STAs supporting different standards It should be noted that there may be compatibility between. However, STA has only forward compatibility instead of backward compatibility. For example, STAs that support HEW are compatible with STAs that support the 802.11ac standard, but STAs that support the 802.11ac standard are not compatible with STAs that support the HEW. For example, when there are multiple types of STAs on the network, the number of different standards supported by the various STAs in the network is three, four or more, and alternative data GI lengths are correspondingly determined In this case, the number of alternative data GI lengths is correspondingly 3, 4 or more. For ease of explanation, assuming that two STAs present in the network support the first standard (such as 802.11ac standard solution) and the second standard (such as current HEW standard solution) respectively: The contents of the present invention will be described in the following, but the substitute data GI lengths are GI1 and GI2.

  Optionally, the access device is configured to transmit the beacon frame, the first standard protocol data unit PPDU 1 and the second standard protocol data unit according to the first alternative data guard interval length GI1 and the second alternative data guard interval length GI2. Although encapsulated in PPDU 2, the constructed PPDU 1 and PPDU 2 need to conform to the PPDU format in their respective standards. The formats of PPDU 1 and PPDU 2 will be separately described below.

  As shown in FIG. 18, optionally, PPDU1 format includes preamble and bearer data, bearer data includes beacon frame, and preamble GI length and data GI length in PPDU1 format are GI1 respectively. The purpose of the AP to send PPDU 1 is to make STA 1 supporting the first standard network discoverable. The first standard may be the 802.11ac standard.

  Optionally, the second standard may be a HEW standard. Referring to the HEW standard, PPDU 2 format has multiple design methods, but is not limited thereto. The following shows the design of three alternative PPDU 2 formats.

  As shown in FIG. 19, in the first alternative implementation method, PPDU 2 includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, and is a combination of L-STF, L-LTF and L-SIG. Is referred to as the legacy preamble, and the combination of HE-SIG, HE-STF, and another possible field is referred to as the HEW preamble. The GI length of the legacy preamble, the GI length of the HEW preamble, and the GI length of the bearer data are GI2 respectively. The purpose of the AP to send PPDU 2 is to make STA 2 supporting the second standard network discoverable. Note that STA2 can also detect PPDU1 and process PPDU1. A description of all the fields of FIG. 19 is shown in FIG.

As shown in FIG. 21, in the second selective implementation method, the PPDU 2 format includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, and the GI length of the legacy preamble is GI1, and the HEW preamble The GI length of and the GI length of the bearer data are GI2 respectively. The purpose of the AP to send PPDU 2 is to make STA 2 supporting the second standard network discoverable. The length of the legacy preamble of PPDU 2 format in the first alternative implementation method obtained from FIG. 20 is 80 us. The length of the legacy preamble of PPDU 2 format in the second selective implementation method obtained from FIG. 22 is 20 us. If the lengths of the remaining fields are the same, in the second alternative implementation, the transmission overhead is reduced by 60 us. A description of all the fields of FIG. 21 is shown in FIG.

  In a third alternative implementation, the PPDU 2 format is shown in FIG. 23, where PPDU 2 includes high efficiency wireless local area network preamble and bearer data. A description of all the fields of FIG. 23 is shown in FIG. The GI length of the HEW preamble and the GI length of the bearer data are respectively GI2, and the purpose of the AP to transmit PPDU2 is to make the STA2 supporting the second standard network discoverable. Compared to the PPDU format in the first alternative implementation way, the PPDU format in the third alternative implementation way removes the legacy preamble. Thus, if the length of the remaining fields is the same, the transmission overhead is reduced by 80 us as compared to the PPDU format in the first alternative implementation manner.

  The processor is further configured to add an operation field used to indicate a transmission time of the second standard protocol data unit to the first standard protocol data unit.

  The transceiver is further configured to broadcast a first standard protocol data unit including the operation field for a preset period of time.

  The transceiver is further configured to broadcast the second standard protocol data unit at the transmission time indicated by the operation field.

  Optionally, the AP transmits the constructed PPDU 1 and PPDU 2. Assuming that PPDU 1 is constructed according to the 802.11ac standard, the transmission period of PPDU 1 specified in the 802.11ac standard is T1, and the transmission time of PPDU 2 by the AP may be specified randomly, and the AP For example, transmit PPDU 1 and PPDU 2 alternately. A calculation field may be added to PPDU 1 for display, and a calculation field may be added to PPDU 2 for display. The operation field is used to indicate the transmission time of PPDU 2. The operation field may indicate the transmission time of PPDU 2 by a plurality of display methods, but only two methods are described below.

  In the first alternative implementation, the HE operation field uses only one bit to indicate whether the next m * T (e.g. m = 2/3) period has PPDU 2 but here , T is a preset period for broadcasting PPDU 1. That is, if the value of the HE operation field is 1, it indicates that the next m * T period has PPDU 2; if the value of the HE operation field is 0, the next m * T period does not have PPDU 2 Indicates that. As shown in FIG. 25, the value of the HE operation field of the first PPDU 1 from the left is 1, indicating that the next m * T period has PPDU 2, and the value of the HE operation field of the second PPDU 1 is As it is 0, the next m * T period does not have PPDU2.

In a second alternative implementation, the HE operation field has two or more bits indicated as x bits. The HE operation field may be used to indicate whether the next (n + m * T) (e.g., m = 2/3, n is a natural number indicated by x bits) period has PPDU 2 or not. That is, if the value of the HE operation field is n, the next (n + m * T) period is PPDU 2
Indicates that the As shown in FIG. 26, since the value of the HE operation field of the first PPDU 1 from the left is 1, it indicates that the next m * T period has PPDU 2, and the value of the HE operation field of the second PPDU 1 is As it is 2, the next two m * T periods have PPDU2.

  Optionally, the access device broadcasts PPDU 1 including the operation field at a specific preset time period. PPDU 1 may be encapsulated by the 802.11ac standard, and thus PPDU 1 may be broadcast by a preset time period in the 802.11ac standard.

  Optionally, as shown in FIG. 25 or 26, the access device broadcasts PPDU 2 at the transmission time indicated by the operation field. Upon receiving PPDU 1, the terminal may know the transmission time of PPPDU 2 by the operation field, and may receive PPDU 2 at the known transmission time.

  In this embodiment of the present invention, the access device constructs a beacon frame, the beacon frame includes newly added fields, and the newly added fields represent a plurality of data guard interval lengths supported by the access device. The access device broadcasts the constructed beacon frame, and the terminal selects an available guard interval length matching the data guard interval length supported by the terminal from the beacon frame broadcast by the access device, and the available guard Communicate with the access device by using the interval length. In this embodiment, in the standard proposing a plurality of data guard interval lengths, a plurality of data guard interval lengths supported by the access device in order to execute data communication between the access device and the terminal normally are beacon frames. May be encapsulated in the newly added field of.

  Referring to FIG. 31, FIG. 31 is a schematic block diagram of another terminal according to the present invention. Terminal 40 of FIG. 31 may be configured to implement all the steps and methods in the method embodiments described above. In the embodiment of FIG. 31, terminal 40 includes processor 400, transceiver 401, memory 402, antenna 403, and bus 404. The processor 400 controls the operation of the terminal 40 but can also be configured to process signals. Memory 402, which may include read only memory and random access memory, provides instructions and data for processor 400. Transceiver 401 may be coupled to antenna 403. The components in terminal 40 are coupled together by using bus system 404, which, in addition to the data bus, further includes a power supply bus, a control bus, and a status signal bus. However, various buses are shown as bus system 404 in the figure for clarity of illustration. For example, the terminal 40 may be STA1, STA2, and STA3 illustrated in FIG. In the following, all components of the terminal 40 will be described in detail.

  The transceiver is configured to obtain a beacon frame broadcast by the access device, but the beacon frame includes newly added fields, and the newly added fields are a plurality of data guard intervals that the access device supports. Represents the length.

  The processor is configured to select, from the plurality of data guard interval lengths supported by the access device, an available guard interval length that matches the data guard interval length supported by the terminal.

  The transceiver is configured to communicate data with the access device by using the available guard interval length.

  Optionally, the terminal STA obtains a beacon frame broadcast by the access device, but the beacon frame may be a beacon frame, the beacon frame including a newly added field, and a newly added field Represents a plurality of data GI lengths supported by the access device. The processing procedure of the STA corresponds to the processing procedure of the access device AP described above. The AP side encapsulates the beacon frame into a first standard protocol data unit PPDU1 and a second standard protocol data unit PPDU2, but the first standard may be the 802.11ac standard, the second standard is It may be HEW standard. In this embodiment, if there is a STA1 supporting the first standard and a STA2 supporting the second standard on the network, STA1 can perform normal detection processing only in PPDU1. For the detection processing method, although not detailed here, please refer to the 802.11ac standard solution. The STA processing procedure described here refers to the processing procedure of the STA 2 described above.

  The AP transmits PPDU1 in a preset period, but PPDU1 includes an operation field used to indicate the transmission time of PPDU2, and the operation field indicates the transmission time of PPDU2. Specifically, there are three alternative implementations of the method that the STA uses to obtain the beacon frame broadcast by the AP.

  In the first alternative implementation method, when the STA acquires PPDU1 broadcasted by the AP, the STA processes PPDU1 and analyzes the beacon frame from PPDU1 and at the same time in data communication between the STA and AP thereafter. The preamble length is determined by the PPDU 1 preamble. For example, if the preamble of PPDU1 is GI1, the STA sets the preamble in subsequent data communication to GI1.

  In the second alternative implementation method, when the STA acquires PPDU 2 broadcasted by AP, the STA processes PPDU 2 and analyzes the beacon frame from PPDU 2 at the same time as data communication between the STA and AP thereafter. The preamble length is determined by the PPDU 2 preamble. For example, if the preamble of PPDU 2 is GI 2, the STA sets the preamble in subsequent data communication to GI 2.

  In a third alternative implementation, when the STA receives PPDU 1, the STA obtains the next PPDU 2 transmission time from PPDU 1 by parsing the “HE-Operation” field. For example, if "HE operation" uses a bit to indicate whether the next period has PPDU 2, if the "HE operation" field indicates 0, then the STA needs to detect PPDU 2 in the next period. If it indicates that there is one, or if the “HE operation” field indicates 1, it indicates that the STA does not need to detect PPDU 2 in the next period. The STA analyzes the beacon frame from the detected PPDU 2. Furthermore, the STA determines the preamble length in the subsequent data communication between the STA and the AP according to the PPDU 2 preamble. For example, if the preamble of PPDU 2 is GI 2, the STA sets the preamble in subsequent data communication to GI 2.

  Optionally, the terminal STA analyzes the beacon frame after acquiring the beacon frame. The specific analysis method is that the STA detects all capability elements of the beacon frame and obtains the data GI length supported by the AP by analyzing the "HE enabled GI" field, and the STA supports the STA. The available GI length may be set based on the data GI length and the acquired data GI length supported by the AP. For example, if the data GI length indicated by the information on the "HE compatible GI" field is {0.8 us, 1.6 us, 2.4 us}, the data GI length supported by the AP is {0.8 us, 1.6 us , 2.4 us}. The GI length supported by the STA itself is {0.4 us, 0.8 us, 1.6 us, 2.4 us, 3.2 us}. The data GI lengths supported by both AP and STA2 are {0.8 us, 1.6 us}, and in this case, {0.8 us, 1.6 us} is the available data GI length. In the subsequent communication between the STA and the AP, the data GI length is selected from the available data GI lengths according to the channel conditions to construct a PPDU.

  Optionally, after obtaining the available data GI length, the STA may perform data communication with the AP by using the available data GI length. Specifically, in the subsequent communication between the STA and the AP, the data GI length is selected from the available data GI lengths according to the channel state to construct a PPDU.

  Furthermore, the STA generates an association request frame with the available data GI length, and transmits the association request frame to the AP. After receiving the association request frame, the AP analyzes the association request frame and returns an association response frame to the STA if the STA is authorized to access the network. After receiving the association response frame, the STA analyzes the association response frame. In this case, the STA establishes an association with the AP, and then the AP and STA may perform data communication for data transmission.

  The transceiver is further configured to obtain a first standard protocol data unit broadcast by the access device and parse a beacon frame from the first standard protocol data unit, or the transceiver transmits the second broadcast by the access device. Or the transceiver may obtain the first standard protocol data unit broadcast by the access device, and / or the transceiver may further obtain the first protocol data unit of the second protocol data unit and analyze the beacon frame from the second standard protocol data unit. The transmission time of the second standard protocol data unit is determined from the operation field in one standard protocol data unit, and the second standard protocol data unit is obtained according to the transmission time, and the beacon from the second standard protocol data unit is obtained. Further configured to analyze the frame.

  In this embodiment of the present invention, the access device constructs a beacon frame, the beacon frame includes newly added fields, and the newly added fields represent a plurality of data guard interval lengths supported by the access device. The access device broadcasts the constructed beacon frame, and the terminal selects an available guard interval length matching the data guard interval length supported by the terminal from the beacon frame broadcast by the access device, and the available guard Communicate with the access device by using the interval length. In this embodiment, in the standard proposing a plurality of data guard interval lengths, a plurality of data guard interval lengths supported by the access device in order to execute data communication between the access device and the terminal normally are beacon frames. May be encapsulated in the newly added field of.

  Those skilled in the art may understand that all or part of the process of the embodiment method can be implemented by a computer program instructing relevant hardware. The program may be stored in a computer readable storage medium. When the program is executed, the process of the embodiment method is executed. Examples of the storage medium include a magnetic disk, an optical disk, a read only memory (ROM), and a random access memory (RAM).

  What has been disclosed above is only an exemplary embodiment of the present invention and does not limit the protection scope of the present invention. Accordingly, equivalent modifications made based on the claims of the present invention are intended to be included within the scope of the present invention.

30 Access device
40 terminals
100 construction modules
101 Encapsulation module
102 processing module
103 transceiver module
200 transceiver module
201 Selection module
300 processor
301 transceiver
302 memory
303 antenna
304 bus, bus system
400 processor
401 transceiver
402 memory
403 antenna
404 bus, bus system
1030 First acquisition unit
1031 Second Acquisition Unit
1032 encapsulation unit

The present invention relates to the field of data communication technology, and more particularly to a data communication method and related apparatus.

Claims (22)

Constructing a beacon frame by an access device, wherein the beacon frame includes a newly added field, and the newly added field represents a plurality of data guard interval lengths supported by the access device. Step and
A data communication with the access device by the terminal selecting from the beacon frame an available guard interval length that matches the data guard interval length supported by the terminal, and using the available guard interval length Broadcasting the beacon frame by the access device to:
Data communication methods, including:   The beacon frame includes at least one element, a particular element in the at least one element carries the newly added field, and the particular element is an existing element or a newly added element The method according to claim 1. The newly added field includes an indication index value corresponding to each preset bandwidth, and the indication index value is all data guard interval lengths supported by the access device within the preset bandwidth. Or the newly added field includes an indication bit of each preset data guard interval length, and the indication bit is the data guard preset by the access device. Used to indicate whether to support interval length, or the newly added field includes an indication bit of each preset data guard interval length within each preset bandwidth, the indication bit Is the band to which the access device is preset Is used to indicate whether they support the preset data guard interval length in the width A method according to claim 2. After said step of constructing a beacon frame by the access device
Separately encapsulating by the access device the beacon frame into a first standard protocol data unit and a second standard protocol data unit,
The step of the access device broadcasting the beacon frame;
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. The method described in. The plurality of data guard interval lengths supported by the access device are data guard interval lengths supported by the access device in the first standard, and the data guard interval lengths supported by the access device in the second standard. Including
Said separately encapsulating said beacon frame into a first standard protocol data unit and a second standard protocol data unit by said access device;
The access device acquires the maximum data guard interval length in the data guard interval length supported by the access device in the first standard, and sets the maximum data guard interval length as a first alternative data guard interval length. The step of determining
The access device acquires a maximum data guard interval length in the data guard interval length supported by the access device in the second standard, and sets the maximum data guard interval length as a second alternative data guard interval length. The step of determining
The access frame separately transmits the beacon frame to the first standard protocol data unit and the second standard protocol data unit according to the first alternative data guard interval length and the second alternative data guard interval length. Encapsulating, and
5. The method of claim 4, comprising   The first standard protocol data unit includes preamble and bearer data, the bearer data includes the beacon frame, and a guard interval length of the preamble and a guard interval length of the bearer data are the first alternative data guard 6. The method of claim 5, which is an interval length. The second standard protocol data unit includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, a guard interval length of the legacy preamble, a guard interval length of the high efficiency wireless local area network preamble, the bearer The guard interval length of data is respectively the second alternative data guard interval length, or
The second standard protocol data unit includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, and a guard interval length of the legacy preamble is the first alternative data guard interval length, the high The guard interval length of the efficiency wireless local area network preamble and the guard interval length of the bearer data are the second alternative data guard interval length, or
The second standard protocol data unit includes a high efficiency wireless local area network preamble and bearer data, and a guard interval length of the high efficiency wireless local area network preamble and a guard interval length of the bearer data are both the second. Is an alternate data guard interval length,
The method of claim 5. Before the step of the access device broadcasting the beacon frame encapsulated in the first standard protocol data unit and the beacon frame encapsulated in the second standard protocol data unit,
The access device adding to the first standard protocol data unit an operation field used to indicate a transmission time of the second standard protocol data unit;
The access device broadcasting the beacon frame encapsulated in the first standard protocol data unit and the beacon frame encapsulated in the second standard protocol data unit;
Broadcasting the first standard protocol data unit containing the operation field during a preset period of the access device;
The access device broadcasting the second standard protocol data unit at the transmission time indicated by the operation field;
A method according to claim 5, comprising A step in which the terminal acquires a beacon frame broadcast by the access device, the beacon frame including a newly added field, the newly added field being a plurality of data guard intervals supported by the access device; Representing the length, and
Selecting, from the plurality of data guard interval lengths supported by the access device, the available guard interval length matching the data guard interval length supported by the terminal;
The terminal communicating data with the access device by using the available guard interval length;
Data communication methods, including:   The beacon frame is encapsulated in a first standard protocol data unit and a second standard protocol data unit, and the access device transmits the first standard protocol data unit for a preset period of time, the first The method according to claim 9, wherein the standard protocol data unit of comprises an operation field used to indicate a transmission time of the second standard protocol data unit. The step of the terminal acquiring the beacon frame broadcast by the access device is:
The terminal obtains the first standard protocol data unit broadcast by the access device, and analyzes the beacon frame from the first standard protocol data unit, or
The terminal obtains the second standard protocol data unit broadcast by the access device, and analyzes the beacon frame from the second standard protocol data unit, or
The terminal acquires the first standard protocol data unit broadcast by the access device, and determines the transmission time of the second standard protocol data unit from the operation field in the first standard protocol data unit; Acquiring the second standard protocol data unit according to the transmission time and analyzing the beacon frame from the second standard protocol data unit;
11. The method of claim 10, comprising: An access device,
Building a beacon frame, wherein the beacon frame includes a newly added field, and the newly added field represents a plurality of data guard interval lengths supported by the access device. And
A transceiver configured to broadcast the beacon frame and perform data communication with a terminal;
Access devices, including:   The beacon frame includes at least one element, a particular element in the at least one element carries the newly added field, and the particular element is an existing element or a newly added element The access device according to claim 12. The newly added field includes an indication index value corresponding to each preset bandwidth, and the indication index value is all data guard interval lengths supported by the access device within the preset bandwidth. Represents the minimum data guard interval length at, or
The newly added field includes an indication bit of each preset data guard interval length, and the indication bit is used to indicate whether the access device supports the preset data guard interval length. Or
The newly added field includes an indication bit of each preset data guard interval length within each preset bandwidth, and the indication bit is the preset within the bandwidth preset by the access device. Used to indicate if the supported data guard interval length is supported,
The access device according to claim 13. The access device further including an encapsulation module configured to separately encapsulate the beacon frame into a first standard protocol data unit and a second standard protocol data unit;
The transceiver module is specifically configured to broadcast the beacon frame encapsulated in the first standard protocol data unit and the beacon frame encapsulated in the second standard protocol data unit The access device according to claim 12. The plurality of data guard interval lengths supported by the access device include a data guard interval length supported by the access device in the first standard and a data guard interval length supported by the access device in the second standard. The encapsulation module comprises
Configured to obtain a maximum data guard interval length in the data guard interval length supported by the access device in the first standard and determine the maximum data guard interval length as a first alternative data guard interval length The acquired first acquisition unit,
Configured to obtain a maximum data guard interval length in the data guard interval length supported by the access device in the second standard and determine the maximum data guard interval length as a second alternative data guard interval length A second acquisition unit,
According to the first alternative data guard interval length and the second alternative data guard interval length, the beacon frame is separately encapsulated in the first standard protocol data unit and the second standard protocol data unit A configured encapsulation unit,
153. The access device of claim 152, comprising:   The first standard protocol data unit includes preamble and bearer data, the bearer data includes the beacon frame, and a guard interval length of the preamble and a guard interval length of the bearer data are the first alternative data guard 165. The access device of claim 163, wherein the access device is an interval length. The second standard protocol data unit includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, a guard interval length of the legacy preamble, a guard interval length of the high efficiency wireless local area network preamble, the bearer The guard interval length of the data is respectively the second alternative data guard interval length 3, or
The second standard protocol data unit includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data, and a guard interval length of the legacy preamble is the first alternative data guard interval length, the high The guard interval length of the efficiency wireless local area network preamble and the guard interval length of the bearer data are the second alternative data guard interval length, or
The second standard protocol data unit includes a high efficiency wireless local area network preamble and bearer data, and a guard interval length of the high efficiency wireless local area network preamble and a guard interval length of the bearer data are both the second. Is an alternate data guard interval length,
An access device according to claim 163. The access device
The processing module further comprising: a processing module configured to add to the first standard protocol data unit an operation field used to indicate a transmission time of the second standard protocol data unit;
The transceiver module is specifically configured to broadcast the first standard protocol data unit including the operation field for a preset period of time;
The transceiver module is further configured to broadcast the second standard protocol data unit at the transmission time indicated by the operation field;
An access device according to claim 163. A terminal,
Selecting an available guard interval length matching the data guard interval length supported by the terminal from the plurality of data guard interval lengths supported by the access device;
A transceiver configured to obtain a beacon frame broadcast by an access device, the beacon frame including a newly added field, the newly added field being a plurality of supported by the access device. A transceiver, which represents the data guard interval length;
Including
The transceiver is further configured to perform data communication with the access device by using the available guard interval length;
Terminal.   The beacon frame is encapsulated in a first standard protocol data unit and a second standard protocol data unit, and the access device transmits the first standard protocol data unit for a preset period of time, the first 21. The terminal according to claim 20, wherein the standard protocol data unit of comprises a calculated field used to indicate the transmission time of the second standard protocol data unit. The transceiver is specifically configured to obtain the first standard protocol data unit broadcast by the access device and to analyze the beacon frame from the first standard protocol data unit, or
The transceiver is specifically configured to obtain the second standard protocol data unit broadcast by the access device and to analyze the beacon frame from the second standard protocol data unit, or
The transceiver obtains the first standard protocol data unit broadcasted by the access device, and determines the transmission time of the second standard protocol data unit from the operation field in the first standard protocol data unit 22. The terminal of claim 21, wherein the terminal is specifically configured to obtain the second standard protocol data unit according to the transmission time and analyze the beacon frame from the second standard protocol data unit.

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