CN106658725B - data transmission method and device - Google Patents

data transmission method and device Download PDF

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Publication number
CN106658725B
CN106658725B CN201510743011.3A CN201510743011A CN106658725B CN 106658725 B CN106658725 B CN 106658725B CN 201510743011 A CN201510743011 A CN 201510743011A CN 106658725 B CN106658725 B CN 106658725B
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China
Prior art keywords
station
channel
scheduled
access point
send
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CN106658725A (en
Inventor
李云波
李彦淳
刘乐
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201510743011.3A priority Critical patent/CN106658725B/en
Priority to PCT/CN2016/083960 priority patent/WO2017075982A1/en
Publication of CN106658725A publication Critical patent/CN106658725A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

the embodiment of the invention provides a data transmission method and a data transmission device, relates to the field of communication, and can effectively protect a main channel, avoid excessively protecting a transmission channel and improve the resource utilization rate of a system. A first station receives a multi-user request-to-send (MU-RTS) frame sent by an access point, wherein the multi-user request-to-send frame comprises the identifications of a plurality of stations and a scheduled transmission channel of each station; the first station determines the first station as a scheduled station according to the identifiers of the plurality of stations; when the scheduled transmission channel of the first station comprises a main channel, the first station sends a CTS frame to an access point on the scheduled channel of the first station; when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station transmits a CTS frame to the access point on the primary channel and the scheduled channel of the first station or transmits a CTS frame on a minimum contiguous channel including the primary channel and the scheduled transmission channel. The method is used for acquiring the path information of the service message.

Description

Data transmission method and device
Technical Field
the present invention relates to the field of communications, and in particular, to a data transmission method and apparatus.
background
the Institute of Electrical and Electronics Engineers (IEEE) 802.11ax standard specifies that an Access Point (AP) and a Station (STA) transmit data in an Orthogonal Frequency Division Multiple Access (OFDMA) transmission mode, that is, each station may transmit data on a transmission channel occupying a part of a basic bandwidth of a wideband bandwidth. Before transmitting data between an access point and a station, the access point needs to send a multi-user request to send (MU-RTS) frame to the station, and after the station receives the MU-RTS frame, the station may repeatedly send a Clear To Send (CTS) frame to the access point on a transmission channel of each basic bandwidth of an occupied wideband bandwidth by using a traditional format (legacy), but since each station may transmit data on a transmission channel of a part of the basic bandwidth of the occupied wideband bandwidth, the transmission channel of all the basic bandwidths of the wideband bandwidth occupied by the station is sent with a clear to send frame, which may cause an over-protection of the transmission channel, and the resource utilization rate of the system is low. In another embodiment, each station only sends a clear-to-send frame on a transmission channel of a basic bandwidth involved in transmitting data, which can avoid over-protection of the transmission channel, however, the transmission channel is divided into a primary channel and a secondary channel, and in the process of receiving data by the current station, usually, a signaling field on the primary channel is analyzed first, bandwidth information and resource allocation information are obtained, then, data is analyzed on a scheduled channel, and then, data is analyzed on an allocated time-frequency resource through an indication of the resource allocation information. When the primary channel is occupied by the Overlapped Basic Service Set (OBSS), although the data of the station is scheduled on the secondary channel, the data cannot be analyzed on the secondary channel due to the fact that the bandwidth and resource allocation information on the primary channel cannot be acquired, and thus the data transmitted on the primary channel by the access point cannot be correctly received.
Disclosure of Invention
embodiments of the present invention provide a data transmission method and apparatus, which can effectively protect a main channel, avoid excessively protecting a transmission channel, and improve the resource utilization rate of a system.
in order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
In a first aspect, a data transmission method is provided, including:
Firstly, a first station receives a multi-user request-to-send (MU-RTS) frame sent by an access point, wherein the multi-user request-to-send frame comprises identifications of a plurality of stations and a scheduled transmission channel of each station; then, the first station determines itself as a scheduled station according to the identifiers of the plurality of stations;
when the scheduled transmission channel of the first station is determined to contain a main channel, the first station sends a clear-to-send (CTS) frame to the access point on the scheduled channel of the first station;
when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point on the primary channel and the scheduled channel of the first station or sends a CTS on a minimum contiguous channel including the primary channel and the scheduled transmission channel.
in the data transmission method provided by the first aspect, after a first station receives a multi-user request-to-send MU-RTS frame sent by an access point, the first station determines that the first station is a scheduled station according to identifiers of a plurality of stations, where the multi-user request-to-send frame includes the identifiers of the plurality of stations and a scheduled transmission channel of each station; when the scheduled transmission channel of the first station is determined to contain a primary channel, the first station sends a CTS frame to the access point on the scheduled channel of the first station; when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point on the primary channel and the scheduled channel of the first station. Therefore, no matter whether the scheduled transmission channel of the station comprises the main channel or not, the main channel can be effectively protected, meanwhile, the transmission channel is prevented from being excessively protected, and the resource utilization rate of the system is improved.
With reference to the first aspect, in a first implementable manner of the first aspect, after the first station determines that the first station is a scheduled station according to the identities of the plurality of stations, the method further includes:
the first station sends a CTS frame to the access point on a primary channel of an overlapping basic service set, OBSS.
with reference to the first aspect, in a second implementation manner of the first aspect, when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the method further includes:
the first station sends a CTS frame to the access point on a primary channel of an overlapping basic service set, OBSS.
With reference to the first implementable manner of the first aspect or the second implementable manner of the first aspect, in a third implementable manner of the first aspect, before the first station receives a multi-user request to send a MU-RTS frame sent by an access point, the method further includes:
and the first station acquires the identification of the main channel of the OBSS.
In the data transmission method provided in the first to third implementable manners of the first aspect, the first station further sends a CTS frame to the access point in the primary channel of the OBSS, regardless of whether the scheduled transmission channel of the first station determined by the first station includes a primary channel; or, when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point not only on the primary channel and the scheduled channel of the first station, but also on a primary channel of an OBSS. Therefore, the first site protects the main channel of the OBSS, other sites are forbidden to use the main channel of the OBSS, interference of data sent by other sites on the first site is avoided, the main channel can be effectively protected, meanwhile, the transmission channel is prevented from being excessively protected, and the resource utilization rate of the system is improved.
in a second aspect, a data transmission method is provided, including:
Firstly, a first site acquires an identifier of a main channel of an overlapped basic service set OBSS; the first station receives a multi-user request sent by an access point and sends an MU-RTS frame; then, the first station determines that the first station is a scheduled station according to the identifiers of the plurality of stations;
When it is determined that the scheduled transmission channel of the first station comprises a primary channel, the first station sending a clear-to-send (CTS) frame to the access point on the scheduled channel of the first station;
when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point on the primary channel of the OBSS and the scheduled channel of the first station.
with reference to the second aspect, in a first implementable manner of the second aspect, when it is determined that the scheduled transmission channel of the first station includes a primary channel, the method further includes:
The first station sends a CTS frame to the access point on a primary channel of the OBSS.
In the data transmission method provided by the second aspect, after a first station receives a multi-user request-to-send MU-RTS frame sent by an access point, the first station determines itself as a scheduled station according to the identities of a plurality of stations, where the multi-user request-to-send frame includes the identities of the plurality of stations and a scheduled transmission channel of each station; when the scheduled transmission channel of the first station is determined to contain a primary channel, the first station sends a CTS frame to the access point on the scheduled channel of the first station; when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station transmitting a CTS frame to the access point on a primary channel of an OBSS and a scheduled channel of the first station; further, when it is determined that the scheduled transmission channel of the first station includes a primary channel, the first station also sends a CTS frame to the access point on the primary channel of the OBSS. Therefore, the first site protects the main channel of the OBSS, other sites are forbidden to use the main channel of the OBSS, interference of data sent by other sites on the first site is avoided, the main channel can be effectively protected, meanwhile, the transmission channel is prevented from being excessively protected, and the resource utilization rate of the system is improved.
in a third aspect, a station is provided, including:
The receiving unit is used for receiving a multi-user request sent by the access point and sending an MU-RTS frame;
The processing unit is used for determining the plurality of sites as scheduled sites according to the identifications of the plurality of sites;
A sending unit, configured to, when it is determined that the scheduled transmission channel of the first station includes a primary channel, the first station sends a clear-to-send, CTS, frame to the access point on the scheduled channel of the first station;
the sending unit is further configured to, when it is determined that the scheduled transmission channel of the first station does not include a primary channel, send, by the first station, a CTS frame to the access point on the primary channel and the scheduled channel of the first station or send a CTS frame on a minimum continuous channel including the primary channel and the scheduled transmission channel.
With reference to the third aspect, in a first implementable manner of the third aspect, the sending unit is further configured to send a CTS frame to the access point on a primary channel of an overlapping basic service set, OBSS.
With reference to the first implementable manner of the third aspect, in a second implementable manner of the third aspect, when it is determined that the scheduled transmission channel of the first station includes a primary channel,
the sending unit is further configured to send a CTS frame to the access point on a primary channel of an overlapping basic service set OBSS.
with reference to the first implementable manner of the third aspect or the second implementable manner of the third aspect, in a third implementable manner of the third aspect, the station further includes:
and the acquisition unit is used for acquiring the identification of the main channel of the OBSS.
In a fourth aspect, there is provided a station comprising:
An obtaining unit, configured to obtain an identifier of a main channel of an overlapping basic service set OBSS;
A receiving unit, configured to receive a multi-user request-to-send MU-RTS frame sent by an access point, where the multi-user request-to-send frame includes identifiers of multiple stations and a scheduled transmission channel of each station;
The processing unit is used for determining the plurality of sites as scheduled sites according to the identifications of the plurality of sites;
a sending unit, configured to, when it is determined that the scheduled transmission channel of the first station includes a primary channel, the first station sends a clear-to-send, CTS, frame to the access point on the scheduled channel of the first station;
the sending unit is further configured to, when it is determined that the scheduled transmission channel of the first station does not include a primary channel, send, by the first station, a CTS frame to the access point on the primary channel of the OBSS and the scheduled channel of the first station.
With reference to the fourth aspect, in a first implementable manner of the fourth aspect, when it is determined that the scheduled transmission channel of the first station includes a primary channel,
The sending unit is further configured to send a CTS frame to the access point on the primary channel of the OBSS.
in a fifth aspect, there is provided a station comprising:
The receiver is used for receiving a multi-user request sent by the access point and sending an MU-RTS frame;
the processor is used for determining the plurality of stations as scheduled stations according to the identifications of the plurality of stations;
A transmitter configured to send a clear-to-send (CTS) frame to the access point on a scheduled channel of the first station when it is determined that the scheduled transmission channel of the first station comprises a primary channel;
The transmitter is further configured to, when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point on the primary channel and the scheduled channel of the first station.
with reference to the fifth aspect, in a first implementable manner of the fifth aspect, the sending unit is further configured to send a CTS frame to the access point on a primary channel of an overlapping basic service set, OBSS.
with reference to the first implementable manner of the fifth aspect, in a second implementable manner of the fifth aspect, when it is determined that the scheduled transmission channel of the first station comprises a primary channel,
the sending unit is further configured to send a CTS frame to the access point on a primary channel of an overlapping basic service set OBSS.
with reference to the first implementable manner of the fifth aspect or the second implementable manner of the fifth aspect, in a third implementable manner of the fifth aspect, the station further includes:
and the acquisition unit is used for acquiring the identification of the main channel of the OBSS.
In a sixth aspect, there is provided a station comprising:
A processor configured to obtain an identification of a primary channel of an overlapping basic service set, OBSS;
A receiver, configured to receive a multi-user request-to-send (MU-RTS) frame sent by an access point, where the MU-RTS frame includes identities of a plurality of stations and a scheduled transmission channel of each of the stations;
the processor is further configured to determine that the plurality of stations are scheduled stations per se according to the identifiers of the plurality of stations;
A transmitter, configured to, when it is determined that the scheduled transmission channel of the first station includes a primary channel, the first station sends a clear-to-send, CTS, frame to the access point on the scheduled channel of the first station;
The transmitter is further configured to, when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point on the primary channel of the OBSS and the scheduled channel of the first station.
With reference to the sixth aspect, in a first implementable manner of the sixth aspect, when it is determined that the scheduled transmission channel of the first station includes a primary channel,
The transmitter is further configured to send a CTS frame to the access point on a primary channel of the OBSS.
drawings
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an access point and a station according to an embodiment of the present invention;
FIG. 3 is a flow chart of a data transmission method according to an embodiment of the present invention;
Fig. 4 is a diagram illustrating a transmission channel according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a data transmission method according to an embodiment of the present invention;
FIG. 6 is a flow chart of another data transmission method according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another data transmission method according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating another data transmission method according to an embodiment of the present invention;
FIG. 9 is a diagram illustrating another data transmission method according to an embodiment of the present invention;
FIG. 10 is a diagram illustrating another data transmission method according to an embodiment of the present invention;
FIG. 11 is a schematic diagram illustrating another data transmission method according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of another data transmission method according to an embodiment of the present invention;
FIG. 13 is a diagram illustrating yet another data transmission method according to an embodiment of the present invention;
Fig. 14 is a schematic diagram of a station structure according to an embodiment of the present invention;
FIG. 15 is a schematic diagram of another station configuration according to an embodiment of the present invention;
FIG. 16 is a schematic diagram of another station according to the present invention;
FIG. 17 is a diagram illustrating yet another data transmission method according to an embodiment of the present invention;
FIG. 18 is a diagram illustrating another data transmission method according to an embodiment of the present invention;
Fig. 19 is a schematic diagram of another data transmission method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention.
The basic principle of the invention is that: the method comprises the steps that a station judges that a scheduled transmission channel of the station comprises a main channel, and the station sends a Clear To Send (CTS) frame to an access point on the scheduled channel of the station; the station judges that the scheduled transmission channel of the station does not include the primary channel, and the station transmits a CTS frame to the access point on the scheduled channel and the primary channel of the station.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
an embodiment of the present invention provides a schematic diagram of a communication system, as shown in fig. 1, the communication system includes an Access Point (AP), a Station (STA) 0, a station 1, a station 2, and a station 3. The access point may be a central node of the communication system, for example, a wireless router used in a home or office is the access point. The website can be a notebook computer, a palm computer (Personal Digital Assistant, abbreviated as "PDA") or other user equipment.
Further, the communication system may further include a server and a communication network. The access point is connected with the server through the communication network, each station can establish connection with the access point, and the station acquires information from the server through the communication network. The server may be a Tencent server or a 360 server, etc. The communication network may be a conventional Internet Protocol (IP) network.
the Institute of Electrical and Electronics Engineers (IEEE) 802.11ac standard specifies that data is transmitted between an Access Point (AP) and a Station (STA) using a transmission channel having a broadband bandwidth. The wideband bandwidth is composed of a plurality of basic bandwidths, the basic bandwidth may be a bandwidth of 20 megahertz (MHz), and the wideband bandwidth may be a bandwidth of 40MHz, 80MHz, or 160 MHz. Data are transmitted between the access point and the sites by adopting an Orthogonal Frequency Division Multiplexing (OFDM) transmission mode, that is, each site transmits the same data on a transmission channel of each basic bandwidth of the occupied broadband bandwidth. Wherein, OFDM is a modulation mode; OFDMA is a multiple access technology, and users access a system by sharing frequency band resources through OFDMA. Bandwidth refers to the amount of data that can be transmitted over a fixed time, i.e., the capacity of the transmission pipe to transmit data. Usually expressed in cycles per second or hertz (hertz for all). The IEEE802.11 protocol suite is a standard established by the IEEE for wireless local area networks.
Furthermore, data can be transmitted between the access point and the station by adopting an Orthogonal Frequency Division Multiple Access (OFDMA) transmission mode specified by the ieee802.11ax standard. Before transmitting data between an access point and a station, the access point needs to send a multi-user request to send (MU-RTS) frame to the station, and after the station receives the MU-RTS frame, the station repeatedly sends a CTS frame to the access point.
As shown in fig. 2, access point 11 includes a transmitter 111, a processor 112, and a receiver 113, and station 12 includes a transmitter 121, a processor 122, and a receiver 123.
Before data is transmitted between an access point and a station, a sending unit of the access point needs to send a multi-user request to send (MU-RTS) frame to the station, after a receiving unit of the station receives the MU-RTS frame, a processing unit of the station judges whether a scheduled transmission channel of the station contains a main channel, and when the scheduled transmission channel of the station contains the main channel, the sending unit of the station sends a CTS frame to the receiving unit of the access point on the scheduled channel of the station; when the scheduled transmission channel of the station does not include the primary channel, the transmitting unit of the station transmits a CTS frame to the receiving unit of the access point on the primary channel and the scheduled channel of the station. The station 12 also includes a memory for storing an identification of the primary channel.
Further, the processor may further obtain an identifier of a primary channel of an Overlapping Basic Service Set (OBSS). The station also sends a CTS frame to the access point on the primary channel of the OBSS.
An embodiment of the present invention provides a data transmission method, which is assumed to be based on an access point and a station in a communication system shown in fig. 1, and as shown in fig. 3, includes:
Step 101, an access point sends a multi-user request sending frame to a station.
the multi-user request to send (MU-RTS) frame includes identifiers of a plurality of stations and a scheduled transmission channel of each station, where the scheduled transmission channel of a station is a transmission channel allocated by an access point to the station, and the station may occupy the transmission channel allocated by the access point to transmit data. The identification of the station may be an Association Identifier (AID) or a Media Access Control (MAC) address. The identity of the channel may be explicitly indicated, for example, by a bitmap, where each bit represents a fundamental channel, and when set to 1 indicates that the station is scheduled to the fundamental channel, and set to 0 indicates that the station is not scheduled to the fundamental channel. The channel identification may also be implicitly indicated, and one possible way is to represent the base channel positions to which the stations are scheduled by the order of the station identifications, e.g., the first station is scheduled to the first base channel and the nth station is scheduled to the nth base channel. This indication is limited to the data of the scheduling station, and the number of scheduled stations cannot exceed the number of basic channels.
the frame format and transmission method of the MU-RTS frame are not limited in the present invention. For example, the MU-RTS may multiplex a Request To Send (RTS) frame, and modify a Receiving Address (RA) in the RTS frame into AIDs of a plurality of receiving stations, thereby implementing scheduling of the access point to the plurality of stations. A new frame format may also be redefined. The MU-RTS may be sent only on the primary channel or may be repeatedly sent on all of the primary and secondary channels in the transport channel. Preferably, the present invention recommends repeating transmission on all channels of the transmission channel to better protect the master and slave channels.
As shown in fig. 4, the transmission channel includes one master channel and a plurality of slave channels. The bandwidth of the master channel may be a 20MHz bandwidth, the bandwidth of the slave channel may be equal to or greater than 20MHz, and may be a bandwidth of 40MHz, 80MHz, or 160 MHz. After introduction of OFDMA in ieee802.11ax, each station can schedule any one 20MHz for transmission, and thus the bandwidth of a slave channel larger than the 20MHz bandwidth can be divided into a plurality of slave channels according to the bandwidth of the master channel. In the embodiment of the present invention, the total bandwidth of 80MHz is taken as an example to be introduced, and it includes one master channel of 20MHz, i.e., CH0 in fig. 5 and 7 to 9, and 3 slave channels of 20MHz, i.e., CH1, CH2 and CH3 in fig. 5 and 7 to 9.
step 102, station 0 receives a multi-user request transmission frame sent by an access point.
The multi-user request-to-send frame includes an identification of a plurality of stations and a scheduled transmission channel for each of the stations.
Step 103, the station 0 determines that the station 0 is a scheduled station according to the identifier of the station 0 and the identifiers of the plurality of stations.
The site 0 firstly analyzes the multi-user request sending frame, and acquires the identifiers of a plurality of sites and the scheduled transmission channel of each site from the multi-user request sending frame; then, the station 0 compares the identifier of the station 0 with the identifiers of each of the plurality of stations one by one, and if the identifiers of the plurality of stations include the identifier of the station that is the same as the identifier of the station 0, it is determined that the station 0 is the scheduled station.
Step 104, station 0 determines whether the scheduled transmission channel of station 0 includes a primary channel.
when the station 0 determines that the scheduled transmission channel of the station 0 includes the primary channel, step 105 is performed.
when the station 0 determines that the scheduled transmission channel of the station 0 does not include the primary channel, step 106 is performed.
Specifically, the scheduled transmission channel included in the multi-user request transmission frame received by the station 0 may be an identifier of the scheduled transmission channel, and the station 0 may determine whether the identifier of the scheduled transmission channel includes an identifier of a primary channel.
It should be noted that the access point may store the identification of the primary channel in advance. The multi-user request-to-send frame sent by the access point may include an identification of the primary channel. After receiving the multi-user request transmission frame, the station 0 may obtain the identifier of the primary channel from the multi-user request transmission frame. Station 0 may also pre-store the identity of the primary channel.
Step 105, station 0 sends a CTS frame to the access point on the scheduled channel of station 0.
Step 106, station 0 sends a CTS frame to the access point on the primary channel and the scheduled channel of station 0.
It should be noted that, the prior art may be referred to as a specific method for multiple stations to simultaneously send CTS on the same channel. Since multiple CTS are triggered by the same MU-RTS, the content sent by the station to the access point can be identical. The scrambling code seed that is used to scramble the CTS frame is typically randomly generated by the station, so that even the exact same content will be different due to the different scrambling code seed selections. All stations can select the scrambling code seeds of the MU-RTS frame or a certain field in the MU-RTS frame as the scrambling code seeds, so that the purpose that the scrambling code seeds of all stations are the same is achieved.
similarly, the station 1, the station 2, and the station 3 may transmit the clear-to-send frame to the access point according to the specific methods of the step 102 to the step 106.
In this way, after a first station receives a multi-user request-to-send (MU-RTS) frame sent by an access point, the first station determines itself to be a scheduled station according to the identities of a plurality of stations, wherein the multi-user request-to-send frame comprises the identities of the plurality of stations and a scheduled transmission channel of each station; when the scheduled transmission channel of the first station is determined to contain a primary channel, the first station sends a CTS frame to the access point on the scheduled channel of the first station; when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point on the primary channel and the scheduled channel of the first station. Therefore, no matter whether the scheduled transmission channel of the station comprises the main channel or not, the main channel can be effectively protected, meanwhile, the transmission channel is prevented from being excessively protected, and the resource utilization rate of the system is improved.
for example, as shown in fig. 5, a data transmission scheme is schematically shown, and it is assumed that CH0 is a master channel, and CH1, CH2 and CH3 are all slave channels. Station 0, station 1, station 2, and station 3 store the identity of the primary channel, respectively. After station 0, station 1, station 2, and station 3 receive the MU-RTS frame, station 0 determines that the scheduled channel of station 0 is CH0, and determines that the scheduled transmission channel of station 0 includes the primary channel, and station 0 sends a clear-to-send frame to the access point on CH 0. Station 1 determines that the scheduled channel of station 1 is CH1, and determines that the scheduled transmission channel of station 1 does not include the primary channel, and station 1 sends a clear-to-send frame to the access point on CH0 and CH 1. The station 2 determines that the scheduled channel of the station 2 is CH2, and determines that the scheduled transmission channel of the station 2 does not include the primary channel, and the station 2 sends a clear-to-send frame to the access point on CH0 and CH 2. The station 3 determines that the scheduled channel of the station 3 is CH3, and determines that the scheduled transmission channel of the station 3 does not include the primary channel, and the station 3 transmits a clear-to-send frame to the access point on CH0 and CH 3.
After receiving the clear-to-send frame sent by the station to the access point, as shown in fig. 5, the access point may send data to multiple stations in a downlink on a channel where the CTS frame is successfully received, and the station sends a block acknowledgement frame (BA) to the access point to acknowledge the data after successfully receiving the data. Of course, the access point may also allocate a plurality of stations to perform uplink data transmission on the channel that successfully receives the CTS frame. The uplink or downlink multiuser data transmission flow after the CTS is not the main point of the present invention, and will not be discussed in detail here.
An embodiment of the present invention provides a data transmission method, which is assumed to be based on an access point and a station shown in fig. 1, and as shown in fig. 6, the method includes:
Step 201, station 0 obtains the identity of the primary channel of the overlapped basic service set.
the site may listen to the position of the primary channel of the Overlapped Basic Service Set (OBSS), and the specific listening manner is not limited in the present invention. The OBSS is located close to the Base Station Subsystem (BSS), so that the coverage areas of the two wireless transmission signals are partially or completely overlapped. All or part of the channels of the OBSS and the BSS overlap.
for example, a station may periodically listen for beacon frames on the primary channel and each secondary channel of the BSS to determine if an OBSS is present. The main channel of the BSS is a channel for transmitting the beacon frame by the AP of the BSS, if other beacon frames are also intercepted on the main channel or the auxiliary channel of the BSS, the BSS is considered to have the OBSS, and the channel for transmitting the other beacon frames is the main channel of the OBSS; if no other beacon frame is sensed on the primary channel and the secondary channel of the BSS, the OBSS is not considered to exist. Alternatively, the station may inform the access point of the primary channel location of the OBSS around the access point via the associated access point.
step 202, station 0 receives a multi-user request transmission frame sent by the access point.
The access point sends a multi-user request sending frame to the station, and the station 0 receives the multi-user request sending frame sent by the access point.
Step 203, the station 0 determines that the station 0 is a scheduled station according to the identifier of the station 0 and the identifiers of the plurality of stations.
specific steps of step 202 to step 203 may refer to step 101 to step 103.
Step 204, the station 0 determines whether the scheduled transmission channel of the station 0 includes a primary channel.
When the station 0 determines that the scheduled transmission channel of the station 0 includes the primary channel, step 205 is executed.
When the station 0 determines that the scheduled transmission channel of the station 0 does not include the primary channel, step 206 is performed.
step 205, station 0 sends a CTS frame to the access point on the primary channel of the OBSS and the scheduled channel of station 0.
Step 206, station 0 sends a CTS frame to the access point on the primary channel of the OBSS, the primary channel, and the scheduled channel of station 0.
similarly, the station 1, the station 2, and the station 3 may transmit the clear-to-send frame to the access point according to the specific methods of step 202 to step 207.
for example, as shown in fig. 7, a data transmission manner diagram is shown, where station 0, station 1, station 2, and station 3 acquire identifiers of main channels of overlapping basic service sets, respectively, and assume that CH0 is a main channel and CH1 is a main channel of an overlapping basic service set. Station 0, station 1, station 2, and station 3 store the identity of the primary channel, respectively. After station 0, station 1, station 2, and station 3 receive the MU-RTS frame, respectively, station 0 determines that the scheduled channel of station 0 is CH0, and determines that the scheduled transmission channel of station 0 includes a primary channel, and station 0 sends a clear-to-send frame to the access point on CH0 and CH 1. Station 1 determines that the scheduled channel of station 1 is CH1, and determines that the scheduled transmission channel of station 1 does not include the primary channel, and station 1 sends a clear-to-send frame to the access point on CH0 and CH 1. The station 2 determines that the scheduled channel of the station 2 is CH2, and determines that the scheduled transmission channel of the station 2 does not include the primary channel, and the station 2 transmits a clear-to-send frame to the access point on CH0, CH1, and CH 2. The station 3 determines that the scheduled channel of the station 3 is CH3, and determines that the scheduled transmission channel of the station 3 does not include the primary channel, and the station 3 transmits a clear-to-send frame to the access point on CH0, CH1, and CH 3.
Optionally, when the station 0 determines that the scheduled transmission channel of the station 0 includes the primary channel, the station 0 sends a CTS frame to the access point on the scheduled channel of the station 0. When the station 0 determines that the scheduled transmission channel of the station 0 does not include the primary channel, the station 0 sends a CTS frame to the access point on the primary channel of the OBSS, the primary channel, and the scheduled channel of the station 0.
for example, as shown in fig. 8, a data transmission manner diagram is shown, where station 0, station 1, station 2, and station 3 acquire identifiers of main channels of overlapping basic service sets, respectively, and assume that CH0 is a main channel and CH1 is a main channel of an overlapping basic service set. Station 0, station 1, station 2, and station 3 store the identity of the primary channel, respectively. After station 0, station 1, station 2, and station 3 receive the MU-RTS frame, station 0 determines that the scheduled channel of station 0 is CH0, and determines that the scheduled transmission channel of station 0 includes the primary channel, and station 0 sends a clear-to-send frame to the access point on CH 0. Station 1 determines that the scheduled channel of station 1 is CH1, and determines that the scheduled transmission channel of station 1 does not include the primary channel, and station 1 sends a clear-to-send frame to the access point on CH0 and CH 1. The station 2 determines that the scheduled channel of the station 2 is CH2, and determines that the scheduled transmission channel of the station 2 does not include the primary channel, and the station 2 transmits a clear-to-send frame to the access point on CH0, CH1, and CH 2. The station 3 determines that the scheduled channel of the station 3 is CH3, and determines that the scheduled transmission channel of the station 3 does not include the primary channel, and the station 3 transmits a clear-to-send frame to the access point on CH0, CH1, and CH 3.
Optionally, when the station 0 determines that the scheduled transmission channel of the station 0 includes the primary channel, the station 0 sends a CTS frame to the access point on the scheduled channel of the station 0. When the station 0 determines that the scheduled transmission channel of the station 0 does not include the primary channel, the station 0 sends a CTS frame to the access point on the primary channel of the OBSS and the scheduled channel of the station 0.
For example, as shown in fig. 9, a schematic diagram of a data transmission manner is shown, where station 0, station 1, station 2, and station 3 acquire identifiers of main channels of overlapping basic service sets, respectively, and assume that CH0 is a main channel and CH1 is a main channel of an overlapping basic service set. Station 0, station 1, station 2, and station 3 store the identity of the primary channel, respectively. After station 0, station 1, station 2, and station 3 receive the MU-RTS frame, station 0 determines that the scheduled channel of station 0 is CH0, and determines that the scheduled transmission channel of station 0 includes the primary channel, and station 0 sends a clear-to-send frame to the access point on CH 0. The station 1 determines that the scheduled channel of the station 1 is CH1, and determines that the scheduled transmission channel of the station 1 does not include the primary channel, and the station 1 sends a clear-to-send frame to the access point on CH 1. The station 2 determines that the scheduled channel of the station 2 is CH2, and determines that the scheduled transmission channel of the station 2 does not include the primary channel, and the station 2 sends a clear-to-send frame to the access point on CH1 and CH 2. The station 3 determines that the scheduled channel of the station 3 is CH3, and determines that the scheduled transmission channel of the station 3 does not include the primary channel, and the station 3 transmits a clear-to-send frame to the access point on CH1 and CH 3.
Optionally, when the station 0 determines that the scheduled transmission channel of the station 0 includes a main channel, the station 0 sends a CTS frame to the access point on the main channel of the OBSS and the scheduled channel of the station 0. When the station 0 determines that the scheduled transmission channel of the station 0 does not include the primary channel, the station 0 sends a CTS frame to the access point on the primary channel of the OBSS and the scheduled channel of the station 0.
For example, as shown in fig. 10, a data transmission manner diagram is shown, where station 0, station 1, station 2, and station 3 acquire identifiers of main channels of overlapping basic service sets, respectively, and assume that CH0 is a main channel and CH1 is a main channel of an overlapping basic service set. Station 0, station 1, station 2, and station 3 store the identity of the primary channel, respectively. After station 0, station 1, station 2, and station 3 receive the MU-RTS frame, respectively, station 0 determines that the scheduled channel of station 0 is CH0, and determines that the scheduled transmission channel of station 0 includes a primary channel, and station 0 sends a clear-to-send frame to the access point on CH0 and CH 1. The station 1 determines that the scheduled channel of the station 1 is CH1, and determines that the scheduled transmission channel of the station 1 does not include the primary channel, and the station 1 sends a clear-to-send frame to the access point on CH 1. The station 2 determines that the scheduled channel of the station 2 is CH2, and determines that the scheduled transmission channel of the station 2 does not include the primary channel, and the station 2 sends a clear-to-send frame to the access point on CH1 and CH 2. The station 3 determines that the scheduled channel of the station 3 is CH3, and determines that the scheduled transmission channel of the station 3 does not include the primary channel, and the station 3 transmits a clear-to-send frame to the access point on CH1 and CH 3.
It should be noted that the clear-to-send frame is sent in a legacy format (legacy), that is, sent using an OFDM format on a transmission channel with a basic bandwidth, and sent in a repeated manner on a transmission channel with a wideband bandwidth. A station may send an OFDMA CTS frame before or after sending a clear to send frame to the access point so that the station and access point can identify which stations successfully received the MU-RTS and reply with OFDMA CTS and legacy CTS.
As shown in fig. 11, OFDMA CTS is sent before CTS, so that the access point knows as early as possible that there are those stations that reply, and thus there is enough time for downlink data scheduling after CTS. Alternatively, OFDMA CTS is sent after CTS, which may enable legacy (legacy) stations to receive CTS frames as early as possible for better channel protection. Both methods can be applied to the present invention.
wherein the OFDMA CTS frame includes an OFDM part and an OFDMA part. The OFDM part comprises a non-high-throughput Short Training Field (called non-HT Short Training Field for Short), a non-high-throughput Long Training Field (called non-HT Long Training Field for Short), a non-high-throughput signaling Field (called non-HT signaling Field for Short), and an efficient signaling Field A (called high efficiency signaling Field for Short). The OFDMA part comprises a High Efficiency Short Training Field (HE-STF) and a HE-payload. Each station of the OFDM part occupies the transmission channel of the whole basic bandwidth for transmission, the transmission contents of a plurality of stations are the same and are overlapped in time and frequency, and the access point analyzes the overlapped transmission of the plurality of stations as a transmission message. The OFDMA part occupies a part of OFDMA subchannel to transmit by each station, the contents transmitted by a plurality of stations are different and are orthogonal in frequency domain, and the access point can simultaneously analyze the contents of different stations.
as shown in fig. 12, the OFDMA CTS transmission scheme is based on the scenario of the station data transmission in fig. 5. A station scheduled on the primary channel transmits an OFDM part and an OFDMA part of an OFDMA CTS on the primary channel; a station scheduled to a slave channel repeatedly transmits the OFDM part and the OFDMA part of the OFDMA CTS on the scheduled channel and the master channel, respectively. For each station, its OFDMA CTS transmission channel is the same as the CTS transmission channel.
Optionally, the station sends an OFDMA CTS frame in the scheduled channel, including an OFDM part and an OFDMA part. And only the OFDM part of the OFDMA CTS is repeatedly transmitted on the primary channel of the CTS and/or the primary channel of the OBSS, and the OFDMA part is not transmitted.
as shown in fig. 13, the OFDMA CTS transmission scheme is based on the scenario of the station data transmission in fig. 5. A station scheduled on the primary channel transmits an OFDM part and an OFDMA part of an OFDMA CTS on the primary channel; a station scheduled to a slave channel transmits the OFDM part of OFDMA CTS and the OFDMA part on the scheduled channel, and repeatedly transmits only the OFDM part of OFDMA CTS on the master channel without transmitting the OFDMA part. The scenario of other embodiments is sent in a similar manner. For each station, its OFDMA CTS transmission channel is the same as the CTS transmission channel.
an embodiment of the present invention provides a station 30, as shown in fig. 14, including:
a receiving unit 301, configured to receive a multi-user request to send MU-RTS frame sent by an access point, where the multi-user request to send frame includes identifiers of multiple stations and a scheduled transmission channel of each station;
a processing unit 302, configured to determine itself as a scheduled station according to the identifiers of the multiple stations;
A sending unit 303, configured to, when it is determined that the scheduled transmission channel of the first station includes a primary channel, the first station sends a CTS frame to the access point on the scheduled channel of the first station;
the sending unit 303 is further configured to, when it is determined that the scheduled transmission channel of the first station does not include a primary channel, send, by the first station, a CTS frame to the access point on the primary channel and the scheduled channel of the first station.
In the data transmission method provided in the embodiment of the present invention, after a first station receives a multi-user request-to-send MU-RTS frame sent by an access point, the first station determines that the first station is a scheduled station according to identifiers of a plurality of stations, where the multi-user request-to-send frame includes the identifiers of the plurality of stations and a scheduled transmission channel of each station; when the scheduled transmission channel of the first station is determined to contain a primary channel, the first station sends a CTS frame to the access point on the scheduled channel of the first station; when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point on the primary channel and the scheduled channel of the first station. Therefore, no matter whether the scheduled transmission channel of the station comprises the main channel or not, the main channel can be effectively protected, meanwhile, the transmission channel is prevented from being excessively protected, and the resource utilization rate of the system is improved.
As shown in fig. 15, the station 30 further includes:
An obtaining unit 304, configured to obtain an identity of a primary channel of an overlapping basic service set OBSS.
When it is determined that the scheduled transmission channel of the first station does not include a primary channel, the sending unit 303 is further configured to send a CTS frame to the access point on the primary channel of the OBSS.
When it is determined that the scheduled transmission channel of the first station includes a primary channel, the sending unit 303 is further configured to send a CTS frame to the access point on the primary channel of the OBSS.
In this way, the first station determines whether the scheduled transmission channel of the first station includes a primary channel, and the first station further sends a CTS frame to the access point on the primary channel of the OBSS; or, when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point not only on the primary channel and the scheduled channel of the first station, but also on a primary channel of an OBSS. Therefore, the first site protects the main channel of the OBSS, other sites are forbidden to use the main channel of the OBSS, interference of data sent by other sites on the first site is avoided, the main channel can be effectively protected, meanwhile, the transmission channel is prevented from being excessively protected, and the resource utilization rate of the system is improved.
An embodiment of the present invention provides a station 40, as shown in fig. 16, including:
An obtaining unit 401, configured to obtain an identifier of a main channel of an overlapping basic service set OBSS;
A receiving unit 402, configured to receive a multi-user request to send MU-RTS frame sent by an access point, where the multi-user request to send frame includes identities of a plurality of stations and a scheduled transmission channel of each of the stations;
A processing unit 403, configured to determine that the plurality of stations are scheduled stations according to the identifiers of the plurality of stations;
a sending unit 404, configured to, when it is determined that the scheduled transmission channel of the first station includes a primary channel, the first station sends a CTS frame to the access point on the scheduled channel of the first station;
the sending unit 404 is further configured to, when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point on the primary channel of the OBSS and the scheduled channel of the first station.
When it is determined that the scheduled transmission channel of the first station includes a primary channel, the sending unit 404 is further configured to send a CTS frame to the access point on the primary channel of the OBSS.
In the data transmission method provided in the embodiment of the present invention, after a first station receives a multi-user request-to-send MU-RTS frame sent by an access point, the first station determines that the first station is a scheduled station according to identifiers of a plurality of stations, where the multi-user request-to-send frame includes the identifiers of the plurality of stations and a scheduled transmission channel of each station; when the scheduled transmission channel of the first station is determined to contain a primary channel, the first station sends a CTS frame to the access point on the scheduled channel of the first station; when it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station transmitting a CTS frame to the access point on a primary channel of an OBSS and a scheduled channel of the first station; further, when it is determined that the scheduled transmission channel of the first station includes a primary channel, the first station also sends a CTS frame to the access point on the primary channel of the OBSS. Therefore, the first site protects the main channel of the OBSS, other sites are forbidden to use the main channel of the OBSS, interference of data sent by other sites on the first site is avoided, the main channel can be effectively protected, meanwhile, the transmission channel is prevented from being excessively protected, and the resource utilization rate of the system is improved.
Referring to fig. 17, in another embodiment of the present invention, it is assumed that the channels CH0, CH1, CH2 and CH3 are adjacent and consecutive in frequency, i.e., CH0> CH1> CH2> CH3 or CH0< CH1< CH2< CH 3. The transmission resource scheduled by the AP for STA3 is channel 3(CH 3). STA3 transmits on the smallest contiguous channel including its primary channel (CH0) and scheduled transmission channel (CH3), which is CH0, CH1, CH2, CH3, including its primary channel (CH0) and scheduled transmission channel (CH 3). This way of transmitting CTS with minimum contiguous channel has the advantage that since STA3 also transmits CTS on CH1 sandwiched between CH0 and CH2, 3, the power spectrum of the signal transmitted by STA3 is contiguous in frequency, and the difficulty of signal generation is small. In addition, when STA3 receives signals, STA3 is not interfered with on CH2 because STA3 is channel protected on CH 2. In each embodiment of the present invention, the transmission key signaling channel may be a single channel. Or multiple channels (e.g., CH0, CH1), in which case the primary channel included in the CTS transmission may be a key signaling channel of multiple channels.
in the embodiment shown in fig. 18, if STA3 is scheduled by the AP for transmission resources of channel 2(CH2), STA2 transmits on the smallest contiguous channel containing its primary channel (CH0) and scheduled transmission channel (CH2), namely CH0, CH1, CH 2.
In the embodiment shown in fig. 19, STA2 transmits on a channel that contains the smallest channel bonding pattern combination (e.g., the 802.11ac defined channel combination) of its primary channel (CH0) and the channel (CH2) on which the transmission resources reside, namely CH0, CH1, CH2, CH 3. The method for transmitting the CTS by adopting the minimum channel binding mode combination has the advantages that the method is simple to realize because a Station (STA) adopting the method can use the CTS transmission mode with small combination quantity or the CTS transmission mode of the original 11ac system. The CTS transmission combination of the original 11ac system is 20MHz, 40MHz (20 MHz +20MHz), 80MHz (20 MHz +20MHz +20MHz), and 160MHz (20 MHz +20MHz +20MHz +20MHz +20MHz +20 MHz).
It should be noted that, the receiving unit in this embodiment may be a receiver of a station, and the sending unit may be a transmitter of the station; in addition, the receiving unit and the transmitting unit may be integrated to form a transceiver of the station. The processing unit may be a processor of the station. The processor may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media capable of storing program codes, such as Read-Only Memory (ROM), Random-Access Memory (RAM), magnetic disk, and optical disk.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (12)

1. a method of data transmission, comprising:
a first station receives a multi-user request-to-send (MU-RTS) frame sent by an access point, wherein the multi-user request-to-send frame comprises identifications of a plurality of stations and a scheduled transmission channel of each station;
the first station determines that the first station is a scheduled station according to the identifiers of the plurality of stations;
when it is determined that the scheduled transmission channel of the first station comprises a primary channel, the first station sending a clear-to-send (CTS) frame to the access point on the scheduled channel of the first station;
When it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point on the primary channel and the scheduled channel of the first station or sends a CTS on a minimum contiguous channel including the primary channel and the scheduled transmission channel.
2. the method of claim 1, wherein when it is determined that the scheduled transmission channel of the first station comprises a primary channel, the method further comprises:
the first station sends a CTS frame to the access point on a primary channel of an overlapping basic service set, OBSS, and a scheduled channel of the first station.
3. the method of claim 1, wherein when it is determined that the scheduled transmission channel of the first station does not contain a primary channel, the method further comprises:
The first station sends a CTS frame to the access point on a primary channel of an overlapping basic service set, OBSS, the primary channel, and a scheduled channel of the first station.
4. A method according to claim 2 or 3, wherein before the first station receives the multi-user request-to-send MU-RTS frame sent by the access point, the method further comprises:
And the first station acquires the identification of the main channel of the OBSS.
5. A method of data transmission, comprising:
a first station acquires the identification of a main channel of an overlapped basic service set OBSS;
the first station receives a multi-user request-to-send (MU-RTS) frame sent by an access point, wherein the multi-user request-to-send frame comprises identifications of a plurality of stations and a scheduled transmission channel of each station;
the first station determines that the first station is a scheduled station according to the identifiers of the plurality of stations;
when it is determined that the scheduled transmission channel of the first station comprises a primary channel, the first station sending a clear-to-send (CTS) frame to the access point on the scheduled channel of the first station;
When it is determined that the scheduled transmission channel of the first station does not include a primary channel, the first station sends a CTS frame to the access point on the primary channel of the OBSS and the scheduled channel of the first station.
6. the method of claim 5, wherein when it is determined that the scheduled transmission channel of the first station comprises a primary channel, the method further comprises:
the first station sends a CTS frame to the access point on a primary channel of the OBSS.
7. a station, comprising:
a receiving unit, configured to receive a multi-user request-to-send MU-RTS frame sent by an access point, where the multi-user request-to-send frame includes identifiers of multiple stations and a scheduled transmission channel of each station;
The processing unit is used for determining the plurality of sites as scheduled sites according to the identifications of the plurality of sites;
A sending unit, configured to, when it is determined that a scheduled transmission channel of a first station includes a primary channel, send, by the first station, a clear to send, CTS, frame to the access point on the scheduled channel of the first station;
The sending unit is further configured to, when it is determined that the scheduled transmission channel of the first station does not include a primary channel, send, by the first station, a CTS frame to the access point on the primary channel and the scheduled channel of the first station or send a CTS frame on a minimum continuous channel including the primary channel and the scheduled transmission channel.
8. The station of claim 7, wherein when it is determined that the scheduled transmission channel of the first station comprises a primary channel,
the sending unit is further configured to send a CTS frame to the access point on a primary channel of an overlapping basic service set OBSS and a scheduled channel of the first station.
9. The station of claim 7, wherein when it is determined that the scheduled transmission channel of the first station does not contain a primary channel,
the sending unit is further configured to send a CTS frame to the access point on a primary channel of an overlapping basic service set OBSS, the primary channel, and a scheduled channel of the first station.
10. the station according to claim 8 or 9, characterized in that it further comprises:
And the acquisition unit is used for acquiring the identification of the main channel of the OBSS.
11. A station, comprising:
an obtaining unit, configured to obtain an identifier of a main channel of an overlapping basic service set OBSS;
a receiving unit, configured to receive a multi-user request-to-send MU-RTS frame sent by an access point, where the multi-user request-to-send frame includes identifiers of multiple stations and a scheduled transmission channel of each station;
the processing unit is used for determining the plurality of sites as scheduled sites according to the identifications of the plurality of sites;
A sending unit, configured to, when it is determined that a scheduled transmission channel of a first station includes a primary channel, send, by the first station, a clear to send, CTS, frame to the access point on the scheduled channel of the first station;
The sending unit is further configured to, when it is determined that the scheduled transmission channel of the first station does not include a primary channel, send, by the first station, a CTS frame to the access point on the primary channel of the OBSS and the scheduled channel of the first station.
12. The station of claim 11, wherein when it is determined that the scheduled transmission channel of the first station comprises a primary channel,
the sending unit is further configured to send a CTS frame to the access point on the primary channel of the OBSS.
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