JP7270787B2 - Method, apparatus and system for transmitting data carrying instructional information - Google Patents

Description

TECHNICAL FIELD The present invention relates to wireless communication technology, and more particularly to a method, system and apparatus for transmitting data carrying instructional information.

In Wireless Local Area Network (WLAN) systems, a carrier sense mechanism is essential for contention-free operation. Specifically, Physical Carrier Sense, which logically resides in the physical (PHY) layer, is responsible for detecting data transmissions of other stations. However, in some cases, not all stations may have their transmitted data detected by physical carrier sensing. In the network shown in FIG. 1, a BSS includes one access point (Access Point, abbreviated AP) and three stations (Station, abbreviated STA): STA1, STA2 and STA3. For example, data transmitted by STA1 may be detected by AP and STA2, and remote STA3 can detect data transmitted by AP but not data transmitted by STA1. For AP and STA1, STA3 is a hidden node. In this case, when STA1 transmits a data frame to the AP, STA3 cannot detect the data frame, so STA3 erroneously determines that the channel is idle and starts data frame transmission. This causes interference in data frame transmission between STA1 and AP.

In the prior art, a Request To Send (RTS for short)/Clear To Send (CTS for short) mechanism is proposed to prevent the influence of data transmission by hidden nodes. Figure 2 is used as an example. The horizontal axis is the time axis. STA1 first sends an RTS frame, and AP returns a CTS frame after receiving the RTS frame. The "duration" field of the RTS frame carries the specified value of the network allocation vector (NAV for short). NAV provides a virtual carrier sensing mechanism that enhances physical carrier sensing, so that when a station receives a frame not intended for that station, the station can set the NAV according to the "duration" field of the frame. . That is, no data is transmitted during that time to reduce interference. The duration indicated by the NAV specification is the response time of the CTS frame plus the time required to exchange the next frame. The "duration" field of the CTS frame is set to the "duration" field of the RTS frame minus the short interframe space (SIFS for short) and the response duration of the CTS frame. Thus, STA3 in FIG. 1 receives the CTS frame and sets its NAV to delay for the next frame exchange.

In next-generation WLAN systems, Orthogonal Frequency Division Multiple Access (OFDMA for short) technology is introduced in the 802.11ax standard. Multiple users can transmit and receive data simultaneously on orthogonal subchannels. Compared to previous WLAN systems, there are more channel bandwidths available, including bandwidths of 20 megahertz (MHz), 40 MHz, 80 MHz, and 160 MHz. The 40 MHz bandwidth includes a first 20 MHz channel and a second 20 MHz channel, the 80 MHz bandwidth includes a first 20 MHz channel, a second 20 MHz channel and a second 40 MHz channel, and the 160 MHz bandwidth includes Including a first 20MHz channel, a second 20MHz channel, a second 40MHz channel and a second 80MHz channel.

According to existing RTS/CTS mechanisms, bandwidth information needs to be exchanged to improve the robustness of hidden nodes. Specifically, the transmitting-end node uses the RTS frame to indicate that the transmitting-end node can support dynamic bandwidth, and the node that needs to return the CTS frame uses the idle bandwidth carried in the RTS frame. If no NAV is set for some or all channels in the width and CCA detects the first idle bandwidth less than the bandwidth indicated in the RTS frame, the node may return a CTS frame only in the first idle bandwidth, and the node sending the RTS frame shall send data to the node responding with the CTS frame only in the first idle bandwidth after receiving the CTS. do. If the transmitting end node uses the RTS frame to indicate that the transmitting end node cannot support dynamic bandwidth, i.e. only supports static bandwidth, the receiving end node shall A CTS frame is returned only when all channels in the idle bandwidth are detected to be idle. A bandwidth of 80 MHz is used as an example, as shown in FIG. The AP duplicates and transmits RTS frames every 20MHz channel, and dynamic bandwidth is supported. STA1 replicates the CTS frame on four 20MHz channels and reports to the AP that the idle bandwidth is 80MHz. STA2 transmits a CTS frame on one 20 MHz channel to report to the AP that the idle bandwidth is 20 MHz. STA3 duplicates the CTS frame on four 20MHz channels and reports to the AP that the idle bandwidth is 80MHz. BA (Block Acknowledgment) is an acknowledgment frame and is used to acknowledge the data sent by the transmitting end node. However, this method of reporting available bandwidth requires excessively high overhead.

To solve the prior art problem that methods of reporting available bandwidth require high overhead, embodiments of the present invention provide a method, system and apparatus for transmitting data carrying indication information. I will provide a.

A first aspect of an embodiment of the invention is a method for transmitting data carrying instructional information, comprising:
generating an indication frame by a transmitting end node;
and sending, by a transmitting end node, an indication frame to a receiving end node, the indication frame including available channel indication information or idle bandwidth information.

With respect to the first aspect, in a first possible embodiment of the first aspect, the step of generating, by the transmitting end node, the indication frame comprises:
setting, by a transmitting end node, a value of a first bit in an indication frame, the value of the first bit being used to identify available channel indication information or idle bandwidth information; Including steps.

With respect to the first possible embodiment of the first aspect, in the second possible embodiment of the first aspect the value of the first bit is used to identify available channel indication information. teeth,
identifying that the primary channel of the transmitting end node is idle and all secondary channels are busy when the value of the first bit is the first value; When a value of 2 includes identifying that the primary channel of the transmitting end node is idle and that at least one secondary channel is idle.

With respect to the second possible embodiment of the first aspect, in the third possible embodiment of the first aspect, prior to the step of transmitting, by the transmitting end node, an indication frame to the receiving end node, the method comprises:
further comprising, by a transmitting end node, scrambling the indication frame using a scrambler;
All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify whether the corresponding secondary channel is idle.

With respect to the first possible embodiment of the first aspect, in the fourth possible embodiment of the first aspect the value of the first bit is used to identify idle bandwidth information by:
identifying that the indication frame does not carry idle bandwidth information when the value of the first bit is the first value; or when the value of the first bit is the second value, the indication frame is Including identifying as carrying idle bandwidth information.

With respect to the fourth possible embodiment of the first aspect, in the fifth possible embodiment of the first aspect, prior to the step of transmitting, by the transmitting end node, an indication frame to the receiving end node, the method comprises:
further comprising, by a transmitting end node, scrambling the indication frame using a scrambler;
All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify the corresponding idle bandwidth type.

With respect to any of the first to fifth possible embodiments of the first aspect, in a sixth possible embodiment of the first aspect, the indication frame is a clear-to-send (CTS ) frame, thus the first is a bit in the receiver address field in the CTS frame, or the first bit is at least one bit in the frame control field in the CTS frame, or the instruction frame is the media access It is a control MAC frame, so the first bit is a bit within the MAC frame.

With respect to the first aspect, in a seventh possible embodiment of the first aspect, the indication frame comprises an indication field, and the indication field comprises a plurality of bits, and generating, by a transmitting end node, the indication frame. teeth,
setting a plurality of bit values and using the plurality of bit values to identify different available channel indication information, or using the plurality of bit values to identify different idle bandwidths, by a transmitting end node; including identifying information.

With respect to the seventh possible embodiment of the first aspect, in the eighth possible embodiment of the first aspect, prior to the step of transmitting, by the transmitting end node, the indication frame to the receiving end node,
Further comprising scrambling the indication frame using a scrambler by the transmitting end node.

A second aspect of an embodiment of the invention is a method for transmitting data carrying instructional information, comprising:
receiving, by a receiving end node, an indication frame sent by a plurality of transmitting end nodes;
obtaining, by a receiving end node, indication information based on the indication frame, the indication information including available channel indication information or idle bandwidth information.

Regarding the second aspect, in a first possible embodiment of the second aspect, the step of obtaining, by the receiving end node, the indication information based on the indication frame comprises:
obtaining, by a receiving end node, a value of a first bit in the indication frame based on the indication frame, the value of the first bit for identifying available channel indication information or idle bandwidth information; including steps used for

With respect to the first possible embodiment of the second aspect, in the second possible embodiment of the second aspect the value of the first bit is used to identify the available channel indication information. teeth,
identifying that the primary channel of the transmitting end node is idle and all secondary channels are busy when the value of the first bit is the first value; When a value of 2 includes identifying that the primary channel of the transmitting end node is idle and that at least one secondary channel is idle.

With regard to the second possible embodiment of the second aspect, in a third possible embodiment of the second aspect, the step of obtaining, by the receiving end node, the indication information based on the indication frame comprises:
By the receiving end node, obtaining the initial state bit of the scrambler based on the scrambling code of the indication frame and using the descrambler to obtain the indication information based on the initial state bit of the scrambler. comprising descrambling the frames;
All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify whether the corresponding secondary channel is idle.

With respect to the first possible embodiment of the second aspect, in the fourth possible embodiment of the second aspect the value of the first bit is used to identify idle bandwidth information by:
identifying that the indication frame does not carry idle bandwidth information when the value of the first bit is the first value; or when the value of the first bit is the second value, the indication frame is Including identifying as carrying idle bandwidth information.

With respect to the fourth possible embodiment of the second aspect, in the fifth possible embodiment of the second aspect, the step of obtaining, by the receiving end node, the indication information based on the indication frame comprises:
By the receiving end node, obtaining the initial state bit of the scrambler based on the scrambling code of the indication frame and using the descrambler to obtain the indication information based on the initial state bit of the scrambler. comprising descrambling the frames;
All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify the corresponding idle bandwidth type.

With respect to any of the first through fifth possible embodiments of the second aspect, in the sixth possible embodiment of the second aspect the indication frame is a clear to send ( CTS ) frame, thus the The 1 bit is the bit in the receiver address field in the CTS frame, or the first bit is at least one bit in the frame control field in the CTS frame, or the instruction frame It is an access control MAC frame, so the first bit is the bit within the MAC frame.

Regarding the second aspect, in a seventh possible embodiment of the second aspect, the indication frame comprises an indication field, and the indication field comprises a plurality of bits,
Multiple bit values identify different available channel indication information, or multiple bit values identify different idle bandwidth information.

With respect to the seventh possible embodiment of the second aspect, in the eighth possible embodiment of the second aspect, the step of obtaining, by the receiving end node, the indication information based on the indication frame comprises:
By the receiving end node, obtaining the initial state bit of the scrambler based on the scrambling code of the indication frame and using the descrambler to obtain the indication information based on the initial state bit of the scrambler. including descrambling the frame.

A third aspect of an embodiment of the present invention is a transmission end node,
a generation module configured to generate an instruction frame;
a transmitting module configured to transmit an indication frame to a receiving end node, the indication frame providing the transmitting end node including available channel indication information or idle bandwidth information.

Regarding the third aspect, in a first possible embodiment of the third aspect, the generation module is particularly configured to set the value of the first bit in the indication frame, the value of the first bit being , is used to identify available channel indication information or idle bandwidth information.

With respect to the first possible embodiment of the third aspect, in the second possible embodiment of the third aspect the value of the first bit is used to identify the available channel indication information. teeth,
identifying that the primary channel of the transmitting end node is idle and all secondary channels are busy when the value of the first bit is the first value; When a value of 2 includes identifying that the primary channel of the transmitting end node is idle and that at least one secondary channel is idle.

With respect to the second possible embodiment of the third aspect, in a third possible embodiment of the third aspect the transmitting end node further comprises a scrambling module,
the scrambling module is configured to scramble the instruction frame using a scrambler;
All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify whether the corresponding secondary channel is idle.

With respect to the first possible embodiment of the third aspect, in the fourth possible embodiment of the third aspect the value of the first bit is used to identify idle bandwidth information by:
identifying that the indication frame does not carry idle bandwidth information when the value of the first bit is the first value; or when the value of the first bit is the second value, the indication frame is Including identifying as carrying idle bandwidth information.

With respect to the fourth possible embodiment of the third aspect, in a fifth possible embodiment of the third aspect the transmission end node further comprises a scrambling module,
the scrambling module is configured to scramble the instruction frame using a scrambler;
All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify the corresponding idle bandwidth type.

With respect to any of the first through fourth possible embodiments of the third aspect, in the sixth possible embodiment of the third aspect the indication frame is a clear to send ( CTS ) frame, thus the The 1 bit is the bit in the receiver address field in the CTS frame, or the first bit is at least one bit in the frame control field in the CTS frame, or the instruction frame It is an access control MAC frame, so the first bit is the bit within the MAC frame.

Regarding the third aspect, in a seventh possible embodiment of the third aspect, the indication frame includes an indication field, and the indication field includes a plurality of bits, thus
The generating module sets the values of the bits and uses the values of the bits to identify different available channel indication information or uses the values of the bits to identify different idle bandwidths. Specifically configured to identify information.

With respect to the seventh possible embodiment of the third aspect, in the eighth possible embodiment of the third aspect the transmission end node further comprises a scrambling module,
The scrambling module is configured to scramble the instruction frame using a scrambler.

A fourth aspect of an embodiment of the present invention is a receiving node,
a receiving module configured to receive indication frames transmitted by a plurality of transmitting end nodes;
an acquisition module configured to acquire instructional information based on the instructional frame;
The indication information provides the receiving end node with available channel indication information or idle bandwidth information.

Regarding the fourth aspect, in a first possible embodiment of the fourth aspect, the obtaining module is specifically configured to obtain the value of the first bit in the instruction frame based on the instruction frame, bit values are used to identify available channel indication information or idle bandwidth information.

With respect to the first possible embodiment of the fourth aspect, in the second possible embodiment of the fourth aspect the value of the first bit is used to identify the available channel indication information. teeth,
identifying that the primary channel of the transmitting end node is idle and all secondary channels are busy when the value of the first bit is the first value; When a value of 2 includes identifying that the primary channel of the transmitting end node is idle and that at least one secondary channel is idle.

With respect to the second possible embodiment of the fourth aspect, in the third possible embodiment of the fourth aspect, the obtaining module scrambling based on the scrambling code of the instruction frame to obtain the instruction information. specifically configured to obtain a blur initial state bit and, using a descrambler, descramble an instruction frame based on the scrambler initial state bit;
All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify whether the corresponding secondary channel is idle.

With respect to the first possible embodiment of the fourth aspect, in the fourth possible embodiment of the fourth aspect the value of the first bit is used to identify the idle bandwidth information by:
identifying that the indication frame does not carry idle bandwidth information when the value of the first bit is the first value; or when the value of the first bit is the second value, the indication frame is Including identifying as carrying idle bandwidth information.

With respect to the fourth possible embodiment of the fourth aspect, in the fifth possible embodiment of the fourth aspect, the obtaining module scrambling based on a scrambling code of the instruction frame to obtain the instruction information. specifically configured to obtain a blur initial state bit and, using a descrambler, descramble an instruction frame based on the scrambler initial state bit;
All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify the corresponding idle bandwidth type.

With respect to any of the first through fifth possible embodiments of the fourth aspect, in the sixth possible embodiment of the fourth aspect, the indication frame is a clear-to-send ( CTS ) frame; The 1 bit is the bit in the receiver address field in the CTS frame, or the first bit is at least one bit in the frame control field in the CTS frame, or the instruction frame It is an access control MAC frame, so the first bit is the bit within the MAC frame.

With respect to the fourth aspect, in a seventh possible embodiment of the fourth aspect, the indication frame comprises an indication field, and the indication field comprises a plurality of bits;
Multiple bit values identify different available channel indication information, or multiple bit values identify different idle bandwidth information.

With respect to the seventh possible embodiment of the fourth aspect, in the eighth possible embodiment of the fourth aspect, the obtaining module scrambling based on the scrambling code of the instruction frame to obtain the instruction information. It is specifically configured to obtain the initial state bits of the blur and use a descrambler to descramble the indication frame based on the initial state bits of the scrambler.

A fifth aspect of an embodiment of the present invention is data carrying indication information, comprising a plurality of transmitting end nodes provided in the third aspect and one receiving end node provided in the fourth aspect. A system for transmitting
A receiver node provides a system for receiving indication frames sent by a plurality of transmitter nodes.

According to the method, system and apparatus for transmitting data carrying indication information provided in the embodiments of the present invention, a receiving end node directly receives indication frames sent by a plurality of transmitting end nodes. and does not need to receive the indication information sent by multiple transmitting end nodes one by one. In addition, the receiving end node can obtain available channel indication information or idle bandwidth information based on the indication frame. This significantly reduces transmission overhead.

A sixth aspect of an embodiment of the invention is a method for transmitting data carrying instructional information, comprising:
generating, by a transmitting end node, an indication frame, the indication frame carrying a receiver address, a basic service set identifier BSSID, and flag bits, the flag bits being the BSSID; a step used to identify information about a location within
and C. sending, by the transmitting end node, an indication frame to the receiving end node.

Regarding the sixth aspect, in a first possible embodiment of the sixth aspect, the step of generating, by the transmitting end node, the indication frame comprises:
setting the value of a flag bit in the original indication frame to a first value by a transmitting end node to generate the indication frame if the receiver address of the original indication frame is the BSSID; or setting the value of a flag bit in the original indication frame to a second value and adding the BSSID to the original indication frame by a transmitting end node to generate an indication frame if the receiver address of is not a BSSID; including.

With respect to the first possible embodiment of the sixth aspect, in the second possible embodiment of the sixth aspect the indication frame is a clear to send ( CTS ) frame, and thus the flag bit is or the flag bit is at least one bit in the frame control field in the CTS frame.

A seventh aspect of an embodiment of the invention is a method for transmitting data carrying instruction information, comprising:
receiving, by a receiving end node, an indication frame sent by the transmitting end node, the indication frame carrying a receiver address, a basic service set identifier BSSID, and flag bits, and wherein the flag bits are Based on the step and the receiver address, which is the BSSID and is used to identify the information about the location in the indication frame, the receiving end node determines that the receiver address of the indication frame is the same as the address of the receiving end node. determining whether there is, and if not, based on the BSSID, determining whether the receiving node stops data transmission within a preset time indicated in the instruction frame; Provide a method, including:

With respect to the seventh aspect, in a first possible embodiment of the seventh aspect, the receiving node, based on the BSSID, causes the receiving node to transmit data within a preset time indicated in the instruction frame. The step of determining whether to stop
determining by the receiving end node based on the BSSID whether the receiving end node and the transmitting end node belong to the same BSS, if they belong to the same BSS, the receiving end node indicates in the indication frame: stopping data transmission within a set preset time, and the receiving end node may continue data transmission if it does not belong to the same BSS.

With respect to the first possible embodiment of the seventh aspect, in the second possible embodiment of the seventh aspect, the flag bits are the BSSID and to identify information about location within the indication frame. It is used
identifying the receiver address of the indication frame as being a BSSID when the flag bit is a first value or identifying the receiver address of the indication frame as not a BSSID when the flag bit is a second value; including doing

With respect to the second possible embodiment of the seventh aspect, in the third possible embodiment of the seventh aspect, when the flag bit is the second value, the indication frame is identified as including a BSSID field; and the BSSID field contains the BSSID.

With respect to the second or third possible embodiments of the seventh aspect, in the fourth possible embodiment of the seventh aspect the flag bit is the first bit in the receiver address field in the indication frame. and determining whether the receiver address of the indication frame is the same as the address of the receiving node, by the receiving end node based on the receiver address field in the indication frame;
If the value of the first bit is the first value, convert the value of the first bit in the receiver address of the indication frame to the second value by the receiving end node, and determining whether the receiver address is the same as the address of the receiving end node, or, if the value of the first bit is the second value, by the receiving end node the receiver address of the instruction frame It includes the step of determining whether it is the same as the address of the receiving end node.

With respect to the third possible embodiment of the seventh aspect, in the fifth possible embodiment of the seventh aspect, the flag bit is at least one bit within a frame control field within an indication frame; determining whether the receiver address of the indication frame is the same as the address of the receiving end node by the receiving end node based on the receiver address field in the frame;
Determining by the receiving end node whether the receiver address of the indication frame is the same as the address of the receiving end node.

With respect to the seventh aspect or the first to fifth possible embodiments of the seventh aspect, in a sixth possible embodiment of the seventh aspect the indication frame is a CTS frame.

An eighth aspect of an embodiment of the present invention is a transmission end node,
A generation module configured to generate an indication frame, the indication frame carrying a receiver address, a basic service set identifier BSSID, and a flag bit, the flag bit being the BSSID, and the indication frame a generation module used to identify information about a position within a frame;
and a transmitting module configured to transmit an indication frame to a receiving end node.

With respect to the eighth aspect, in a first possible embodiment of the eighth aspect, the generating module, if the receiver address of the original instruction frame is a BSSID, to generate the instruction frame: Set the value of the flag bit to a first value, or set the value of the flag bit in the original indication frame to a second value to generate the indication frame if the receiver address in the original indication frame is not a BSSID. set and add the BSSID to the original indication frame.

With respect to the first possible embodiment of the eighth aspect, in the second possible embodiment of the eighth aspect the indication frame is a clear to send ( CTS ) frame, and thus the flag bit is or the flag bit is at least one bit in the frame control field in the CTS frame.

A ninth aspect of an embodiment of the present invention is a receiving node,
A receiving module configured to receive an indication frame transmitted by a transmitting end node, the indication frame carrying a receiver address, a basic service set identifier BSSID, and flag bits, the flag bits , BSSID and used to identify the information about the location in the indication frame;
Based on the receiver address, determine whether the receiver address of the indication frame is the same as the address of the receiving end node, and if not, according to the BSSID, the receiving node is indicated in the indication frame. a determining module configured to determine whether to stop data transmission within a predetermined time.

Regarding the ninth aspect, in a first possible embodiment of the ninth aspect, the determining module determines whether the receiving end node and the transmitting end node belong to the same BSS based on the BSSID. If specifically configured and belonging to the same BSS, the receiving end node is determined to stop data transmission within a preset time indicated in the instruction frame, and if not belonging to the same BSS, the receiving end node is determined to continue data transmission.

With respect to the first possible embodiment of the ninth aspect, in the second possible embodiment of the ninth aspect, the flag bit is a BSSID and is to identify information about location within the indication frame. It is used
identifying the receiver address of the indication frame as being a BSSID when the flag bit is a first value or identifying the receiver address of the indication frame as not a BSSID when the flag bit is a second value; including doing

With respect to the second possible embodiment of the ninth aspect, in the third possible embodiment of the ninth aspect, when the flag bit is the second value, the indication frame is identified as including a BSSID field; and the BSSID field contains the BSSID.

With respect to the second or third possible embodiments of the ninth aspect, in the fourth possible embodiment of the ninth aspect, the flag bit is the first bit in the receiver address field in the indication frame. and the determining module converts the value of the first bit in the receiver address in the indication frame to a second value if the value of the first bit is the first value, and after the conversion determining whether the obtained receiver address is the same as the address of the receiving end node, or if the value of the first bit is the second value, the receiver address of the instruction frame is the receiving end node; is specifically configured to determine whether it is the same as the address of

With respect to the second possible embodiment of the ninth aspect, in a fifth possible embodiment of the ninth aspect, the flag bit is at least one bit within a frame control field within an indication frame, and The module is specifically configured to determine whether the receiver address of the instruction frame is the same as the address of the receiving end node.

With respect to the ninth aspect or any of the first to fifth possible embodiments of the ninth aspect, in a sixth possible embodiment of the ninth aspect, the indication frame is a CTS frame.

According to the method and apparatus for transmitting data carrying indication information provided in the embodiments of the present invention, a transmitting end node generates an indication frame, the indication frame includes a receiver address, BSSID, and flag bits. and ensure that the indication frame contains the BSSID. After receiving the indication frame, other receiving nodes other than the receiving node corresponding to the receiver address of the indication frame obtain the BSSID according to the indication frame, so that the indication frame belongs to another receiving node. It may be determined whether it is from a BSS, and further whether it is necessary to stop data transmission within a certain period of time. That is, it is not necessary for all receiving nodes other than the receiving node corresponding to the receiver address in the indication frame to stop transmitting data after properly receiving the indication frame. Some receiving end nodes may refer to the CCA detection result to further determine whether to continue sending data.

In order to describe the embodiments of the present invention or the technical solutions of the prior art more clearly, the accompanying drawings necessary for describing the embodiments or the prior art are briefly described. Apparently, the accompanying drawings in the following description show some embodiments of the present invention, and those skilled in the art can derive still other drawings from these accompanying drawings without creative efforts.

1 is a schematic diagram of the architecture of a WLAN network; FIG. 1 is a schematic diagram of an RTS/CTS exchange time sequence in a WLAN network of the prior art; FIG. FIG. 4 is a schematic diagram of another RTS/CTS exchange time sequence in a prior art WLAN network; 1 is a schematic flow chart of Embodiment 1 of a method for transmitting data carrying indication information according to the present invention; FIG. 4 is a schematic structural diagram of a scrambler in the method for transmitting data carrying indication information according to the present invention; FIG. 4 is a schematic structural diagram of a CTS frame in the method for transmitting data carrying indication information according to the present invention; Fig. 4 is a schematic structural diagram of another CTS frame in the method for transmitting data carrying indication information according to the present invention; FIG. 4 is a schematic structural diagram of a MAC frame in the method for transmitting data carrying indication information according to the present invention; Fig. 4 is a schematic structural diagram of another CTS frame in the method for transmitting data carrying indication information according to the present invention; 2 is a schematic flow chart of Embodiment 2 of a method for transmitting data carrying indication information according to the present invention; FIG. 4 is a schematic structural diagram of a service field in a method for transmitting data carrying indication information according to the present invention; FIG. 4 is a schematic structural diagram of a service field and a preamble in a method for transmitting data carrying indication information according to the present invention; FIG. 4 is a schematic structural diagram of an RTS frame in a method for transmitting data carrying indication information according to the present invention; 3 is a schematic flow chart of Embodiment 3 of a method for transmitting data carrying indication information according to the present invention; Fig. 4 is a schematic structural diagram of another CTS frame in the method for transmitting data carrying indication information according to the present invention; 4 is a schematic flow chart of Embodiment 4 of a method for transmitting data carrying indication information according to the present invention; 1 is a schematic structural diagram of Embodiment 1 of a transmitting end node according to the present invention; FIG. FIG. 4 is a schematic structural diagram of Embodiment 2 of a transmitting end node according to the present invention; 1 is a schematic structural diagram of Embodiment 1 of a receiving end node according to the present invention; FIG. FIG. 3 is a schematic structural diagram of Embodiment 3 of a transmitting end node according to the present invention; FIG. 4 is a schematic structural diagram of Embodiment 2 of a receiving-end node according to the present invention; FIG. 4 is a schematic structural diagram of Embodiment 4 of a transmitting end node according to the present invention; FIG. 3 is a schematic structural diagram of Embodiment 3 of a receiving end node according to the present invention; FIG. 5 is a schematic structural diagram of Embodiment 5 of a transmitting end node according to the present invention; FIG. 4 is a schematic structural diagram of Embodiment 4 of a receiving end node according to the present invention;

In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described below with reference to the accompanying drawings in the embodiments of the present invention. Be clear and complete. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

Embodiments of the present invention may be applied to WLANs. The standards currently used in WLANs are the Institute of Electrical and Electronics Engineers (IEEE for short) 802.11 series. A WLAN may include multiple Basic Service Sets (BSS for short), and a network node within a Basic Service Set is a STA. As shown in FIG. 1, one BSS may include one AP and three STAs: STA1, STA2, and STA3.

An access point type station AP may also be referred to as a wireless access point, hotspot, or the like. APs are access points that allow mobile users to connect to wired networks, and APs are primarily deployed in homes or buildings and in parks where typical coverage radii range from tens to hundreds of meters. , Of course, it may be arranged outdoors. An AP is equivalent to a bridge that connects wired and wireless networks, and the AP's main function is to connect wireless network clients together and then connect the wireless network to Ethernet. Specifically, the AP may be a terminal device or a network device with a Wireless Fidelity (WiFi for short) chip. Optionally, the AP may be a device supporting the 802.11ax standard. Additionally, optionally, the AP may be a device that supports multiple WLAN standards such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.

Optionally, the STA may support the 802.11ax standard. Additionally, optionally, the STA supports multiple WLAN standards such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.

In WLAN system 802.11ax where OFDMA technology is introduced, an AP may perform uplink and downlink transmissions to different STAs on different time-frequency resources.

Embodiments of the present invention are primarily used to reduce overall network overhead. Nodes in all the embodiments below may include APs or STAs.

FIG. 4 is a schematic flow chart of Embodiment 1 of a method for transmitting data carrying indication information according to the present invention. As shown in FIG. 4, the method includes the following steps.

S101. The transmitting end node generates an indication frame.

S102. The sender node sends an indication frame to the receiver node.

The indication frame contains available channel indication information or idle bandwidth information.

After receiving the indication frame, the receiving end node may obtain available channel indication information or idle bandwidth information carried in the indication frame.

The available channel indication information may indicate the bandwidth of idle channels and idle channels. The idle bandwidth information may indicate bandwidth that is idle. The prior art cannot indicate available channel information.

This embodiment mainly focuses on how the transmitting end node responds after receiving a bandwidth indication. That is, the receiving end node may first send an indication frame (e.g., RTS frame) to indicate bandwidth indication information, and an indication frame (e.g., CTS frame) responds to one instruction frame.

In particular, multiple transmitting end nodes use uplink OFDMA or Multi-User Multiple-Input Multiple-Output (MU-MIMO) to simultaneously transmit indication frames to receiving end nodes. and there is no need to send the idle bandwidth information to the receiving end node one by one.

In this embodiment, the transmitting end node generates an indication frame and directly transmits the indication frame to the receiving end node. Multiple transmitting end nodes may send the indication frame to the receiving end node at the same time, and need not send the idle bandwidth information to the receiving end node one by one. The receiving end node may obtain available channel indication information or idle bandwidth information based on the indication frame. This significantly reduces transmission overhead.

Further, the generation of the indication frame by the transmission end node may specifically be the setting by the transmission end node of the value of the first bit in the indication frame, the value of the first bit being available Used to identify channel indication information or idle bandwidth information. That is, different values of the first bit may identify different available channel indication information or different idle bandwidth information.

Also in particular, the value of the first bit is used to identify the available channel indication information, when the value of the first bit is the first value, the primary channel of the transmitting end node is idle. and all secondary channels are busy, or when the value of the first bit is the second value, the primary channel of the transmitting end node is idle and at least one secondary It may be identifying the channel as idle.

It should be noted that by using clear channel assessment (CCA for short) mechanism, both the transmitting end node and the receiving end node can detect whether the channel is idle and Bandwidth and busy channel bandwidth may be detected.

FIG. 5 is a schematic structural diagram of a scrambler in a method for transmitting data carrying indication information according to the present invention. In particular, before the transmitting end node transmits the indication frame to the receiving end node, the transmitting end node may further scramble the indication frame using a scrambler.

For example, the scrambler uses 7 bits ^X1 - ^X7 to represent the initial state bits of the scrambler, and the generator polynomial of the scrambler is G(X)= ^X7 , as shown in FIG. +X ⁴ +1. In a particular scrambling process, a scrambler repeatedly generates a 127-bit sequence and performs an exclusive OR on the 127-bit sequence with the data to be scrambled to scramble the data to be scrambled. As shown in FIG. 5, an exclusive OR is performed on the indication frame with the output sequence to obtain a scrambled indication frame. In particular, the bit amount of the sequence to be XORed with the instruction frame is the same as the bit amount of the instruction frame. For example, if the amount of bits in the instruction frame is less than 127, a sequence that has the same amount of bits as the instruction frame and is extracted from the 127-bit sequence generated by the scrambler is used exclusively for the instruction frame. A sum is performed. If the bit amount of the instruction frame is greater than 127, then two 127-bit sequences are generated and are of the same bit amount as the instruction frame, and the sequence taken from the generated sequence is XOR is performed on

Based on the above embodiment, when the value of the first bit is the first value, it is identified that the primary channel of the transmitting end node is idle and all secondary channels are busy. All initial state bits of the scrambler used for scrambling are random values. In particular, the scrambler in Figure 5 is used as an example. All initial state bits of the scrambler are randomly generated because the selection switch is directly connected to 2. The scrambler constantly and periodically generates a 127-bit sequence, the last 7 bits of the 127-bit sequence being identical to the initial state bits described above.

When the value of the first bit is the second value, it is identified that the primary channel of the transmitting end node is idle and at least one secondary channel is idle. At least one of the scrambler initial state bits used for scrambling is used to identify whether the corresponding secondary channel is idle.

In particular, the scrambler in Figure 5 is used as an example. In this case, the selection switch is first connected to 1, and a preset initial state is input. For example, 7 bits may be entered as the initial state value. At least one of the preset initial state bits may be used to identify whether the corresponding secondary channel is idle, and all other bits may be randomly generated. After the input is completed, the selection switch is connected to 2 and the scrambler continuously and periodically generates a 127-bit sequence. The first 7 bits of the 127-bit sequence are identical to those of the preset initial state.

For example, the transmitting end node can determine from the RTS indication frame sent by the receiving end node (different from the indication frame generated by the transmitting end node) that the idle bandwidth is less than or equal to 80 MHz and greater than 20 MHz. When learning, 3 of the initial 7 bits of the scrambler may be used to indicate whether or not three secondary 20 MHz channels below 80 MHz are available. At least one of the secondary channels is available and the other 4 bits in the initial state may be random values.

If the transmitting end node learns from the RTS indication frame sent by the receiving end node that the idle bandwidth is equal to 160MHz, then all 7 bits of the scrambler's initial state of 7 bits are replaced by the seven secondary 20MHz bits below 160MHz. May be used to indicate whether a channel is available, at least one secondary channel is available. Alternatively, 5 of the initial 7 bits of the scrambler are used to indicate whether the 4 preferred 20MHz channels are available, and 4 of the corresponding 4 20MHz channels are available. 1 bit identifies 80MHz bandwidth below 160MHz. The remaining 2 bits are random values.

Furthermore, when the transmitting end node learns from the RTS indication frame sent by the receiving end node that the idle bandwidth is 20 MHz, if the transmitting end node is also idle on this 20 MHz channel, the transmitting end node shall , generates and transmits an indication frame. In this case, the value of the first bit is the first value, that is, the initial state of the scrambler that scrambles the instruction frame is all non-zero random values, or the transmitting end node is busy, no indication frame is generated or sent.

In another embodiment, in particular that the value of the first bit is used to identify the idle bandwidth information, when the value of the first bit is the first value, the indication frame is the idle bandwidth information. It may be identifying that it carries no information, or identifying that the indication frame carries idle bandwidth information when the value of the first bit is the second value.

Additionally, if the indication frame carries idle bandwidth information, the indication frame may also specifically indicate the idle bandwidth type.

Before the transmitting end node transmits the indication frame to the receiving end node, the transmitting end node may further scramble the indication frame using a scrambler. See Figure 5 for details of the scrambler.

When the value of the first bit is the first value, ie, if the indication frame does not carry idle bandwidth information, all initial state bits of the scrambler may be random values. That is, since the selection switch is directly connected to 2, all initial state bits of the scrambler are randomly generated.

When the value of the first bit is the second value, at least one of the scrambler initial state bits is used to identify the corresponding idle bandwidth type. Certain embodiments need to ensure that all values in the initial state are non-zero. In WLAN system 802.11ax, idle bandwidth types may include 20MHz, 40MHz, 80MHz and 160MHz. Two of the initial seven bits may be used to identify the idle bandwidth type. For example, "00" identifies 20 MHz and "01" identifies 40 MHz.

In this case, the selection switch is first connected to 1, and a preset initial state is input. For example, 7 bits are entered as the initial state value. At least one of the preset initial state bits is used to identify the corresponding idle bandwidth type. After the input is completed, the selection switch is connected to 2. An embodiment may be that 2 of the preset initial 7 bits identify the idle bandwidth type and the remaining 5 bits are random values.

Based on the previous embodiment, the instruction frame may be a CTS frame.

FIG. 6 is a schematic structure diagram of a CTS frame in the method for transmitting data carrying indication information according to the present invention, and FIG. 7 is a method for transmitting data carrying indication information according to the present invention. Fig. 4 is a schematic structural diagram of another CTS frame in ;

As shown in FIG. 6, the CTS frame consists of a "frame control" field, a "duration" field, a "receiver address (RA)" field, and a " and a frame check sequence (FCS for short) field. The numbers above the frame structure in FIG. 6 represent the amount of bytes corresponding to each field. For example, the "frame control" field contains 2 bytes, ie 16 bits.

In particular, FIG. 7 shows the internal structure of the "Frame Control" field, and the numbers on the structure represent the amount of bits corresponding to each subfield. A field identified with "(0)" indicates that the subfield is meaningless and may be used for another purpose, eg, as the first bit.

Therefore, the first bit may be the bit in the "Receiver Address" field in the CTS frame. The first bit of the MAC address indicates multicast/unicast. However, since the receiver address in the CTS frame is definitely a unicast address, the transmitting end must set the first bit in the receiver address field in the CTS frame to the first value or the first bit to convey information. May be set to a value of 2. The "Receiver Address" field contains 6 bytes in total, and the first bit of the 6 bytes may be used as the first bit.

Alternatively, the first bit may be at least one bit in the "frame control" field in the CTS frame. In particular, one or more of the subfields within the "Frame Control" field: To DS, From DS, More Frag, Retry, Protected Frame, or Order may be used as the first bit. For example, the To DS bit may be used as the first bit, and the initial state of the scrambler may be used to identify specific available channel indication information or specific idle bandwidth information. . In another embodiment, a combination of bits in the subfields To DS, From DS, More Frag, Retry, Protected Frame, and Order may be used as the first bit, and the initial state of the scrambler may be a specific Used to identify available channel indication information or specific idle bandwidth information. For example, a combined value of To DS, From DS, More Frag, and Retry of '0000' represents the first value, and a combined value of To DS, From DS, More Frag, and Retry of '0001' represents the second value. show. Other values such as '0010' are reserved bits and may indicate another meaning.

FIG. 8 is a schematic structural diagram of a MAC frame in a method for transmitting data carrying indication information according to the present invention.

The indication frame in the above embodiments may be a medium access control (MAC) frame. MAC frames include data frames, management frames, or other control frames, such as trigger frames. Therefore, the first bit may be a bit within the MAC frame. In particular, the first bit may be the bit in the "transmitter address (TA for short)" field within the MAC frame. Preferably, the first bit in the 'TA' field in the MAC frame may be used as the aforementioned first bit.

FIG. 8 shows a Directional Multi-Gigabit (DMG for short) CTS frame in 802.11ad. A DMG CTS frame is a control frame within a MAC frame and includes a 'TA' field. Accordingly, the first bit may be placed within the DMG CTS frame, and in particular may be at least one bit within the 'TA' field. Preferably, the first bit in the 'TA' field in the MAC frame may be used as the first bit.

In another embodiment, an indication frame may include an indication field, and the indication field includes multiple bits. Therefore, generating an indication frame by a source node specifically involves setting values of a plurality of bits and using the values of a plurality of bits to identify different available channel indication information by the source node. or, using multiple bit values to identify different idle bandwidth information.

FIG. 9 is a schematic structural diagram of yet another CTS frame in the method for transmitting data carrying indication information according to the present invention. The indication frame may be the CTS frame shown in FIG. 9, and the indication field carries available channel indication information or idle bandwidth information.

For example, the indication field may be an 8-bit field and different values may be set to identify available channel indication information or idle bandwidth information. It is envisioned that for a 160 MHz bandwidth, '11000000' may be used to identify that the first 20 MHz channel and the second 20 MHz channel are available and the other channels are not available. be.

Similarly, before sending the indication frame to the receiving end node, the transmitting end node should scramble the indication frame using a scrambler. This embodiment imposes no special requirements on the initial state of the scrambler. The initial state may be random, but is not limited to this.

FIG. 10 is a schematic flow chart of Embodiment 2 of a method for transmitting data carrying indication information according to the present invention. As shown in FIG. 10, the method includes the following steps.

S201. A receiving end node receives indication frames sent by a plurality of transmitting end nodes.

In particular, a receiving end node may receive indication frames sent by multiple transmitting end nodes by uplink OFDMA or MU-MIMO.

S202. The receiving end node acquires indication information according to the indication frame. The indication information includes available channel indication information or idle bandwidth information.

In particular, the indication frame carries available channel indication information or idle bandwidth information. After receiving the indication frame, the receiving end node may obtain the available channel indication information or idle bandwidth information carried in the indication frame.

In this embodiment, the receiving end node may directly receive the indication frames sent by the multiple sending end nodes, and need not receive the indication information sent by the multiple sending end nodes one by one. . Also, the receiving end node may obtain available channel indication information or idle bandwidth information according to the indication frame. This significantly reduces transmission overhead.

Further, the receiving end node obtaining the indication information based on the indication frame specifically means that the receiving end node obtains the value of the first bit in the indication frame based on the indication frame. bit values are used to identify available channel indication information or idle bandwidth information.

More particularly, the value of the first bit is used to identify the available channel indication information is such that when the value of the first bit is the first value, the primary channel of the transmitting end node is idle. and all secondary channels are busy, or when the value of the first bit is the second value, the primary channel of the transmitting end node is idle and at least one secondary It may be identifying the channel as idle.

For example, when the value of the first bit is '0', it is identified that the primary channel of the transmitting end node is idle and all secondary channels are busy. When the value of the first bit is '1', it is identified that the primary channel of the transmitting end node is idle and at least one secondary channel is idle.

Since the indication frame sent by the transmitting end node may be a scrambled indication frame, therefore, it is especially important for the receiving end node to obtain the indication information based on the indication frame and using the descrambler to descramble the indication frame according to the scrambler initial state bits to obtain indication information.

FIG. 11 is a schematic structural diagram of a service field in a method for transmitting data carrying indication information according to the present invention. FIG. 12 is a schematic structural diagram of a service field and a preamble in a method for transmitting data carrying indication information according to the present invention.

In this embodiment of the invention, the transmitting end node and the receiving end node use the same scrambler with generator polynomial by default. Also, synchronization is performed between the scrambler used by the transmitting end node and the descrambler used by the receiving end node. Specifically, the instruction frame exchanged between the transmitting end node and the receiving end node includes a service field, data bits, tail bits and trailing bits as required.

In 802.11n, referring to FIG. 11, the first 7 bits of the service field are scrambler initialization bits, which are used for synchronization with the descrambler. These bits are set to 0, so the receiver estimates the initial state of the scrambler. The remaining 9 bits are Reserved Service Bits and are also set to 0. The Transmit Order is from low bit 0 to high bit 15.

In 802.11ac, as shown in FIG. 12, the last 8 bits of the 9 reserved bits in the service field in 802.11n are set to an 8-bit Cyclic Redundancy Code (CRC for short). Calibration and error detection are performed on the very high throughput field B (VHT-SIG-B) in the preamble. The scrambler initialization bits are still 7 bits and all 7 bits are set to 0.

After receiving the scrambled indication frame, the receiving end node generates a obtain the first 7 bits of the resulting 127-bit sequence, and further determine the initial state value of the scrambler based on the first 7 bits of the 127-bit sequence and the generator polynomial. The receiving end node may repeatedly generate a 127-bit sequence after receiving the scrambler initial state bits, and XOR the generated 127-bit sequence with the scrambled indication frame, As a result, the instruction frame before scrambling is restored.

Note that the first 7-bit data of the instruction frame must be used in the descrambling process. Therefore, when sending an indication frame, the transmitting end node may set the first 7 bits of data to a known sequence, and all the first 7 bits of data may be set to all 0s and placed in the service field. . In the descrambling process, the receiving end node may know the initial state value of the scrambler.

In the above embodiment, all initial state bits of the scrambler are random values when the first bit is the first value. When the value of the first bit is the second value, at least one of the scrambler initial state bits is used to identify whether the corresponding secondary channel is idle. For details, please refer to the previous embodiments, and the details will not be described again here.

In another embodiment, in particular that the value of the first bit is used to identify the idle bandwidth information, when the value of the first bit is the first value, the indication frame is the idle bandwidth information. identifying that it carries no information, or that the indication frame carries idle bandwidth information when the value of the first bit is the second value. For example, when the first bit is '0', the indication frame is identified as not carrying idle bandwidth information. When the first bit is '1', the indication frame is identified as carrying idle bandwidth information. For details, please refer to the previous embodiments, and the details will not be described again here.

Furthermore, the indication frame sent by the transmitting end node may be a scrambled indication frame, so that the receiving end node obtains the indication information based on the indication frame is particularly Obtaining a scrambler initial state bit according to the scrambling code of the frame, and using a descrambler to descramble the indication frame according to the scrambler initial state bit to obtain indication information. . For the details of the descrambling process, please refer to the previous embodiments, and the details will not be described again here.

Note that when the value of the first bit is the first value, all initial state bits of the scrambler are random values. When the value of the first bit is the second value, at least one of the scrambler initial state bits is used to identify the corresponding idle bandwidth type. In general, when the first bit is '0', all initial state bits of the scrambler are random values. When the first bit is '1', at least one of the scrambler initial state bits is used to identify the corresponding idle bandwidth type.

In a specific implementation process, the instruction frame is a CTS frame. Thus, the first bit is the bit in the "Receiver Address" field in the CTS frame, or the first bit is at least one bit in the "Frame Control" field in the CTS frame. See Figures 6 and 7 for details.

The instruction frame may be a MAC frame. Therefore, the first bit may be a bit within the MAC frame. FIG. 8 shows a DMG CTS frame in 802.11ad. A DMG CTS frame is a control frame within a MAC frame and includes a 'TA' field. Accordingly, the first bit may be placed within the DMG CTS frame, and in particular may be at least one bit within the 'TA' field. Preferably, the first bit in the 'TA' field in the MAC frame may be selected as the first bit.

In another embodiment, referring to FIG. 9, an indication frame may include an indication field, and the indication field includes multiple bits.

Multiple bit values may identify different available channel indication information, or multiple bit values may identify different bandwidth information.

Similar to the previous embodiment, the receiving end node obtaining the indication information based on the indication frame specifically requires the receiving end node to obtain the initial state bit of the scrambler according to the scrambling code of the indication frame, and using a descrambler to descramble the indication frame according to the initial state bits of the scrambler to obtain indication information. For the details of the descrambling process, please refer to the previous embodiments, and the details will not be described again here.

Another aspect of embodiments of the invention focuses on the following. In the prior art, after the STA receives the CTS frame, if the CTS frame is not addressed to the STA, the STA directly sets the NAV to stop data transmission within a certain time, as a result, the system throughput rate is low.

FIG. 13 is a schematic structural diagram of an RTS frame in a method for transmitting data carrying indication information according to the present invention. FIG. 14 is a schematic flow chart of Embodiment 3 of a method for transmitting data carrying indication information according to the present invention.

As shown in FIG. 13, the RTS frame includes a 'frame control' field, a 'duration' field, a 'RA' field, a 'TA' field, and a 'FCS' field. The numbers above the frame structure in FIG. 13 represent the amount of bytes corresponding to each field. For example, the "frame control" field contains 2 bytes, ie 16 bits.

In the RTS / CTS mechanism, we know that the RTS frame contains not only the 'RA' field, but also the 'TA' field. Therefore, regardless of whether the AP sends the RTS frame to the STA or the STA sends the RTS frame to the AP, the RTS frame carries the AP's MAC address. However, as shown in Figure 6, the CTS frame contains only the "RA" field. That is, based on the prior art, when the STA sends a CTS frame to the AP, the CTS frame carries the AP's MAC address, and when the AP sends the CTS frame to the STA, the CTS frame carries the AP's MAC address. do not. In BSS, the AP's MAC address is used as a BSS identifier (BSS identifier, abbreviated as BSSID). Therefore, when receiving the CTS frame sent by the AP, the STA cannot determine whether the CTS frame is from the BSS to which the STA belongs.

As shown in FIG. 14, the method in this embodiment includes the following steps.

S301. A transmitting end node generates an indication frame, the indication frame carrying a receiver address, a BSSID, and flag bits, and the flag bits being the BSSID and identifying information about location within the indication frame. used for

In particular, the flag bit identifies whether the indication frame has the BSSID itself or whether the BSSID is additionally added. If the indication frame has a BSSID itself, the BSSID is the receiver address of the indication frame. If more BSSIDs are carried, it indicates that more BSSIDs need to be added to the indication frame.

S302. The sender node sends an indication frame to the receiver node.

In this embodiment, the transmitting end node generates an indication frame, and the indication frame carries the receiver address, BSSID, and flag bits to ensure that the indication frame contains the BSSID. After receiving the indication frame, another receiving node other than the receiving node corresponding to the receiver address of the indication frame may obtain the BSSID based on the indication frame, so that the indication frame Determine whether the receiving end node is from the BSS it belongs to, and further determine whether data transmission needs to be stopped within a certain time. That is, it is not necessary for all receiving nodes other than the receiving node corresponding to the receiver address of the indication frame to stop transmitting data after properly receiving the indication frame. Some receiving end nodes may further decide whether to continue to send data on the CCA detection result.

In particular, if the receiver address of the original indication frame is the BSSID, the value of the flag bit in the original indication frame is required by the sending end node to generate the indication frame. to a first value, or if the receiver address of the original indication frame is not a BSSID, the transmitting end node sets the value of the flag bit in the original indication frame to a second value to generate the indication frame. value and add the BSSID to the original indication frame.

In particular, the instruction frame may be a CTS frame.

Thus, the flag bit may be the first bit in the "Receiver Address" field in the CTS frame, or the flag bit may be at least one bit in the "Frame Control" field in the CTS frame. good too. For example, a flag bit of '1' indicates that the 'Receiver Address' field in the CTS frame is a BSSID, and a flag bit of '0' indicates that the 'Receiver Address' field in the CTS frame is not a BSSID. and the BSSID is added further.

FIG. 15 is a schematic structural diagram of yet another CTS frame in the method for transmitting data carrying indication information according to the present invention. In the CTS frame shown in Figure 15, a "BSSID" field is additionally added and is used specifically to carry the BSSID. The position and structure of the fields are not limited to this.

FIG. 16 is a schematic flow chart of Embodiment 4 of a method for transmitting data carrying indication information according to the present invention. As shown in FIG. 16, the method includes the following steps.

S401. A receiving end node receives an indication frame sent by a transmitting end node, the indication frame carries a receiver address, a BSSID, and a flag bit, and the flag bit is the BSSID and Used to identify information about a location in a .

In particular, the flag bit identifies whether the indication frame has the BSSID itself or whether the BSSID is additionally added. If the indication frame has a BSSID itself, the BSSID is the receiver address of the indication frame. If more BSSIDs are carried, it indicates that more BSSIDs need to be added to the indication frame.

S402. The receiving end node determines whether the receiver address of the instruction frame is the same as the address of the receiving end according to the receiver address, and if not, the receiving end node determines, according to the BSSID, It is determined whether or not to stop data transmission within a preset time indicated in the instruction frame.

Within a preset period of time may be identified in a "duration" field within the instruction frame.

Especially, if the receiver address of the indication frame is different from the receiver's address, it is further determined whether the transmitter node and the receiver node belong to the same BSS according to the BSSID. If it belongs to the same BSS, the receiving node will stop data transmission within a preset time by setting NAV, or if it does not belong to the same BSS, the receiving node will respond to the CCA detection result. Based on this, it may be determined whether to stop data transmission or continue data transmission within a preset time. That is, if the receiving end node and the transmitting end node do not belong to the same BSS, the data transmission does not necessarily have to stop the data transmission, so that the system throughput rate can be improved.

When the receiver address of the indication frame is the same as the address of the receiving end, it indicates that the indication frame is addressed to the receiving end node. If the indication frame's receiver address is different from the receiving end node's address, it indicates that the indication frame is addressed to another node.

As described in the previous embodiment, both the transmitting end node and the receiving end node determine the idle or busy state of the channel by CCA detection, and the receiving end node, on the CCA detection result, based on the BSSID: The receiving end node determines whether to stop data transmission within a preset time. In this embodiment, in order to improve the likelihood that nodes from different BSSs will transmit data at the same time, and thus improve spectrum utilization, when a node receives an indication frame not from the BSS to which it belongs, , the threshold for idle channel detection by CCA may be raised, ie the idle channel decision condition is released. For example, if a station has previously detected a valid data package on a 20MHz channel and is detected by CCA within 4 milliseconds to have a signal-to-noise ratio of -82dBm or greater with a greater than 90% chance of Determine that it is busy. Therefore, in this embodiment, the CCA detection threshold may be increased, eg, to -72 dBm. That is, a node determines that a channel is busy when CCA detects a greater than 90% probability that the signal-to-noise ratio is -72 dBm or greater within 4 milliseconds. That is, if a node receives an indication frame properly, and the BSSID in the indication frame indicates that the indication frame is from a different BSS, and if the node's CCA detection value is less than -72 dBm, then the indication frame may be ignored and backoff continues for data transmission. If the node properly receives the indication frame, and the BSSID in the indication frame indicates that the indication frame is from the same BSS, the node presets the "duration" field in the indication frame. set the NAV based on the time taken, thus stopping data transmission.

In this embodiment, an indication frame received by a receiving node includes a receiver address and a BSSID, and the receiving node determines whether the indication frame is intended for the receiving node based on the receiver address of the indication frame. It may be determined whether If not addressed to the receiving end node, the receiving end node may further determine whether to stop data transmission within a certain time based on the BSSID. Thus, it is not necessary to stop data transmission when the receiver address of the instruction frame and the address of the receiving end node are different. This improves system throughput.

In particular, when the flag bit is the first value, the receiver address of the indication frame is identified as BSSID, or when the flag bit is the second value, the receiver address of the indication frame is identified as not BSSID. identified.

More particularly, when the flag bit is at the second value, the indication frame includes a BSSID field, and the BSSID field includes the BSSID, as shown in FIG.

The first value may be '1' and the second value may be '0'.

In another embodiment, the flag bit is the first bit in the receiver address field in the instruction frame.

Therefore, it is especially important for the receiving end node to determine whether the receiver address of the instruction frame is the same as the address of the receiving end based on the receiver address. if there is, the receiving end node converts the value of the first bit in the receiver address of the indication frame to the second value, and the receiver address obtained after conversion is the same as the address of the receiving end node; is to determine whether or not If the value of the first bit is the second value, the receiving end node directly determines whether the receiver address of the indication frame is the same as the address of the receiving end node.

It can be appreciated that the first value may be '1' and the second value may be '0'. An analogy may be performed with the receive process described above, ie the first value may be '0' and the second value may be '1'.

In another embodiment, the flag bit may be at least one bit in the "frame control" field in the instruction frame. In this case, the receiving end node determines whether the receiver address of the instruction frame is the same as the address of the receiving end according to the receiver address, and does not need to convert the address. That is, the receiving end node directly determines whether the receiver address of the indication frame is the same as the address of the receiving end node. As shown in FIG. 7, one or more of the subfields within the "Frame Control" field: To DS, From DS, More Frag, Retry, Protected Frame, or Order may be used as flag bits. For example, a combination of bits in To DS, From DS, More Frag, and Retry may be used as flag bits. The combined value of To DS, From DS, More Frag, and Retry, "0000", represents the first value, but is not limited to this.

In the above embodiments, the indication frame may be a CTS frame, but is not limited to this. For example, the instruction frame may be a MAC frame.

In another embodiment, the instruction frame may be an RTS frame. When receiving an RTS frame sent by an 802.11ax device, the receiving node determines whether the receiving node and the transmitting node transmitting the RTS frame belong to the same BSS according to the BSSID in the RTS frame. do. If they belong to the same BSS, the receiving node sets NAV to stop data transmission within a preset time. If not belonging to the same BSS, the receiving node further determines whether to continue transmission based on the CCA detection result. For the specific determination method, please refer to the above-described embodiments, and detailed re-explanation here is omitted. When receiving an RTS frame transmitted by a device compliant with the pre-802.11ax standard, the receiving end node sets the NAV directly based on the "duration" field in the RTS frame, thus setting the preset Stop data transmission in time.

To distinguish between RTS frames sent by 802.11ax devices and RTS frames sent by devices conforming to standards prior to 802.11ax, subfields within the "Frame Control" field in RTS frames: To DS, One or more of From DS, More Frag, Retry, Protected Frame, or Order may be used as flag bits. For example, the To DS bit is used to indicate whether RTS frames are sent by the 802.11ax device. When To DS is set to 1, it indicates that RTS frames are sent by 802.11ax devices. When To DS is set to 0, it indicates that RTS frames are sent by devices compliant with standards prior to 802.11ax.

A compliant device that precedes the 802.11ax standard is a device that supports a standard that precedes the 802.11ax standard, such as an 802.11ac device. This is not limited here.

A person of ordinary skill in the art may understand that all or part of the steps of the method embodiments may be implemented by a program instructing relevant hardware. The program may be stored on a computer-readable storage medium. When the program is run, the steps of the method embodiments are performed. The storage medium includes any medium capable of storing program code, such as ROM, RAM, magnetic disk, and optical disk.

FIG. 17 is a schematic structural diagram of Embodiment 1 of a transmitting end node according to the present invention. As shown in FIG. 17, the transmitting end node includes a generating module 701 and a transmitting module 702.

The generating module 701 is configured to generate instruction frames.

The sending module 702 is configured to send the indication frame to the receiving end node.

The indication frame contains available channel indication information or idle bandwidth information.

The transmitting end node is configured to implement the embodiment of the method corresponding to FIG. 4, the implementation principles and technical effects thereof are similar, and detailed descriptions thereof are omitted here.

In another embodiment, the generation module 701 is specifically configured to set a value of a first bit within the indication frame, the value of the first bit identifying available channel indication information or idle bandwidth information. used to

In particular, the value of the first bit is used to identify the available channel indication information, when the value of the first bit is the first value, the primary channel of the transmitting end node is idle. and all secondary channels are busy, or when the value of the first bit is the second value, the primary channel of the transmitting end node is idle and at least one secondary channel is idle.

FIG. 18 is a schematic structural diagram of Embodiment 2 of a transmitting end node according to the present invention. As shown in FIG. 18, according to FIG. 17, the transmission end node further includes a scrambling module 703 .

The scrambling module 703 is configured to scramble the instruction frame using a scrambler.

All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify whether the corresponding secondary channel is idle.

In another embodiment, the value of the first bit is used to identify idle bandwidth information by
identifying that the indication frame does not carry idle bandwidth information when the value of the first bit is the first value; or when the value of the first bit is the second value, the indication frame is Including identifying as carrying idle bandwidth information. Referring to FIG. 18, in this embodiment the instruction frame also needs to be scrambled. The transmitting end node includes a scrambling module 703 configured to scramble the indication frame using a scrambler. All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify the corresponding idle bandwidth type.

Based on the previous embodiment, the indication frame is a clear to send ( CTS ) frame. Thus, the first bit is a bit within the receiver address field within the CTS frame, or the first bit is at least one bit within the frame control field within the CTS frame, or the instruction frame is the media access control MAC frame, so the first bit is the bit within the MAC frame.

In another embodiment, the indication frame includes an indication field, and the indication field includes multiple bits. Accordingly, the generation module 701 sets the values of the bits and uses the values of the bits to identify different available channel indication information, or uses the values of the bits to identify different idle bands. Specifically configured to identify width information.

Similarly, in this embodiment, the instruction frame also needs to be scrambled. Referring to FIG. 18, the transmitting end node includes a scrambling module 703 configured to scramble the indication frame using a scrambler.

FIG. 19 is a schematic structural diagram of Embodiment 1 of a receiving end node according to the present invention. As shown in FIG. 19, the receiving end node includes a receiving module 901 and an obtaining module 902 .

The receiving module 901 is configured to receive indication frames sent by a plurality of transmitting end nodes.

The acquisition module 902 is configured to acquire indication information based on the indication frame.

The indication information includes available channel indication information or idle bandwidth information.

The receiving end node is configured to implement the method embodiment corresponding to FIG. 10, the implementation principle and technical effect thereof are similar, and the detailed description is omitted here.

In another embodiment, the obtaining module 902 is specifically configured to obtain the value of the first bit in the indication frame based on the indication frame, the value of the first bit being the available channel indication information or the idle Used to identify bandwidth information.

Further, the value of the first bit is used to identify the available channel indication information, when the value of the first bit is the first value, the primary channel of the transmitting end node is idle. and all secondary channels are busy, or when the value of the first bit is the second value, the primary channel of the transmitting end node is idle and at least one secondary channel is idle.

Therefore, the acquisition module 902 acquires the scrambler initial state bits based on the scrambling code of the instruction frame and uses the descrambler to obtain the indication information based on the scrambler initial state bits. is specifically configured to descramble the instruction frame. All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify whether the corresponding secondary channel is idle.

In another embodiment, the value of the first bit is used to identify the idle bandwidth information, when the value of the first bit is the first value, the indication frame is the idle bandwidth information or identifying that the indication frame carries idle bandwidth information when the value of the first bit is the second value.

Therefore, the acquisition module 902 acquires the scrambler initial state bits based on the scrambling code of the instruction frame and uses the descrambler to obtain the indication information based on the scrambler initial state bits. is specifically configured to descramble the instruction frame. All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify the corresponding idle bandwidth type.

The instruction frame is a clear to send ( CTS ) frame. Thus, the first bit is a bit within the receiver address field within the CTS frame, or the first bit is at least one bit within the frame control field within the CTS frame, or the instruction frame is the media access control MAC frame, so the first bit is the bit within the MAC frame.

In another embodiment, the indication frame includes an indication field, and the indication field includes multiple bits, the values of the multiple bits identifying different available channel indication information, or the values of the multiple bits identify different available channel indication information. Identify idle bandwidth information. Therefore, the acquisition module 902 acquires the scrambler initial state bits based on the scrambling code of the instruction frame and uses the descrambler to obtain the indication information based on the scrambler initial state bits. is specifically configured to descramble the instruction frame.

Embodiments of the present invention further provide a system for transmitting data carrying indication information, comprising a plurality of transmitting end nodes and a receiving end node.

A receiving end node may receive indication frames sent by multiple transmitting end nodes. In particular, a receiving end node may receive indication frames simultaneously transmitted by multiple transmitting end nodes.

FIG. 20 is a schematic structural diagram of Embodiment 3 of a transmitting end node according to the present invention. As shown in FIG. 20, the transmission end node includes a generation module 2001 and a transmission module 2002. As shown in FIG.

The generation module 2001 is configured to generate an indication frame, the indication frame carrying a receiver address, a basic service set identifier BSSID, flag bits, the flag bits being the BSSID, and the indication frame Used to identify information about a location within a .

The sending module 2002 is configured to send the indication frame to the receiving end node.

The transmitting end node is configured to implement the embodiment of the method corresponding to FIG. 14, the implementation principle and technical effect thereof are similar, and the detailed description is omitted here.

In another embodiment, the generation module 2001 sets a value of a flag bit in the original indication frame to a first value to generate the indication frame if the receiver address of the original indication frame is the BSSID; Alternatively, if the receiver address of the original instruction frame is not the BSSID, set the value of the flag bit in the original instruction frame to a second value and add the BSSID to the original instruction frame to generate the instruction frame. specifically configured for

Based on the previous embodiment, the indication frame is a clear to send ( CTS ) frame. Thus, the flag bit is a bit within the receiver address field within the CTS frame, or the flag bit is at least one bit within the frame control field within the CTS frame.

FIG. 21 is a schematic structural diagram of Embodiment 2 of a receiving node according to the present invention.As shown in FIG. 21, the receiving node includes a receiving module 2101 and a judging module 2102;

The receiving module 2101 is configured to receive an indication frame sent by a transmitting end node, the indication frame carrying a receiver address, a BSSID and flag bits, the flag bits being the BSSID and an indication frame. Used to identify information about a position within a frame.

The determining module 2102 determines whether the receiver address of the indication frame is the same as the address of the receiving node according to the receiver address, and if not, based on the BSSID, the receiving node determines whether the address of the receiving node is the same. It is configured to determine whether to stop data transmission within a preset time indicated in the frame.

The receiving end node is configured to implement the embodiment of the method corresponding to FIG. 16, the implementation principle and technical effect thereof are similar, and the detailed description is omitted here.

In another embodiment, the determining module 2102 is specifically configured to determine whether the receiving end node and the transmitting end node belong to the same BSS based on the BSSID, and if they belong to the same BSS, the receiving end The node is determined to stop data transmission within a preset time indicated in the instruction frame, and the receiving end node is determined to continue data transmission if it does not belong to the same BSS. be.

The flag bit is the BSSID and is used to identify information about the location within the instruction frame, when the flag bit is the first value, the receiver address of the instruction frame is the BSSID. or identifying that the receiver address of the indication frame is not a BSSID when the flag bit is the second value.

When the flag bit is the second value, the indication frame is identified as containing a BSSID field, and the BSSID field contains the BSSID.

In another embodiment, the flag bit is the first bit in the receiver address field in the instruction frame. Therefore, the decision module 2102 converts the value of the first bit in the receiver address in the indication frame to a second value if the value of the first bit is the first value, and after conversion determining whether the obtained receiver address is the same as the address of the receiving end node, or if the value of the first bit is the second value, the receiver address of the instruction frame is the receiving end node; is specifically configured to determine whether it is the same as the address of

In another embodiment, the flag bit is at least one bit within a frame control field within the indication frame, and the determination module 2102 determines whether the receiver address of the indication frame is the same as the address of the receiving end node. is specifically configured to determine whether

Based on the previous embodiment, the instruction frame CTS frame may be.

FIG. 22 is a schematic structural diagram of Embodiment 4 of a transmitting end node according to the present invention. As shown in FIG. 22, the transmitting end node includes processor 2201 and transmitter 2202 .

Processor 2201 is configured to generate an instruction frame.

Transmitter 2202 is configured to transmit an indication frame to a receiving end node.

The indication frame contains available channel indication information or idle bandwidth information.

The transmitting end node is configured to implement the embodiment of the method corresponding to FIG. 4, the implementation principles and technical effects thereof are similar, and detailed descriptions thereof are omitted here.

In another embodiment, the processor 2201 is specifically configured to set a value of a first bit of the indication frame, the value of the first bit to identify available channel indication information or idle bandwidth information. used for

In particular, the value of the first bit is used to identify the available channel indication information, when the value of the first bit is the first value, the primary channel of the transmitting end node is idle. and all secondary channels are busy, or when the value of the first bit is the second value, the primary channel of the transmitting end node is idle and at least one secondary to identify the channel as idle.

In another embodiment, processor 2201 is configured to scramble the instruction frame using a scrambler.

All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify whether the corresponding secondary channel is idle.

In another embodiment, the value of the first bit is used to identify idle bandwidth information by
identifying that the indication frame does not carry idle bandwidth information when the value of the first bit is the first value; or when the value of the first bit is the second value, the indication frame is Including identifying as carrying idle bandwidth information. Similarly, processor 2201 is further configured to scramble the instruction frame using a scrambler. All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify the corresponding idle bandwidth type.

Based on the previous embodiment, the indication frame is a clear to send ( CTS ) frame. Thus, the first bit is a bit within the receiver address field within the CTS frame, or the first bit is at least one bit within the frame control field within the CTS frame, or the instruction frame is the media access control MAC frame, so the first bit is the bit within the MAC frame.

In another embodiment, the indication frame includes an indication field, and the indication field includes multiple bits. Accordingly, the processor 2201 sets and uses the bit values to identify different available channel indication information or uses the bit values to identify different idle bands. Specifically configured to identify width information. Similarly, in this embodiment, processor 2201 also needs to scramble the instruction frame.

FIG. 23 is a schematic structural diagram of Embodiment 3 of a receiving end node according to the present invention. As shown in FIG. 23, the receiving end node includes receiver 2301 and processor 2302 .

Receiver 2301 is configured to receive indication frames transmitted by a plurality of transmitting end nodes.

Processor 2302 is configured to obtain indication information based on the indication frame.

The indication information includes available channel indication information or idle bandwidth information.

The receiving end node is configured to implement the method embodiment corresponding to FIG. 10, the implementation principle and technical effect thereof are similar, and the detailed description is omitted here.

In another embodiment, the processor 2302 is configured to obtain a value of a first bit in the indication frame based on the indication frame, the value of the first bit being the available channel indication information or idle bandwidth Used to identify information.

Further, the value of the first bit is used to identify the available channel indication information, when the value of the first bit is the first value, the primary channel of the transmitting end node is idle. and all secondary channels are busy, or when the value of the first bit is the second value, the primary channel of the transmitting end node is idle and at least one secondary channel is idle.

Thus, the processor 2302 obtains the scrambler initial state bits based on the scrambling code of the instruction frame and uses the descrambler to obtain the indication information based on the scrambler initial state bits. Specifically configured to descramble the instruction frame. All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify whether the corresponding secondary channel is idle.

In another embodiment, the value of the first bit is used to identify the idle bandwidth information, when the value of the first bit is the first value, the indication frame is the idle bandwidth information or identifying that the indication frame carries idle bandwidth information when the value of the first bit is the second value.

Thus, the processor 2302 obtains the scrambler initial state bits based on the scrambling code of the instruction frame and uses the descrambler to obtain the indication information based on the scrambler initial state bits. Specifically configured to descramble the instruction frame. All the initial state bits of the scrambler are random values when the value of the first bit is the first value, or the initial state bits of the scrambler are random values when the value of the first bit is the second value. At least one of the status bits is used to identify the corresponding idle bandwidth type.

The instruction frame is a clear to send ( CTS ) frame. Thus, the first bit is a bit within the receiver address field within the CTS frame, or the first bit is at least one bit within the frame control field within the CTS frame, or the instruction frame is the media access control MAC frame, so the first bit is the bit within the MAC frame.

In another embodiment, the indication frame includes an indication field, and the indication field includes multiple bits, the values of the multiple bits identifying different available channel indication information, or the values of the multiple bits identify different available channel indication information. Identify idle bandwidth information. Thus, the processor 2302 obtains the scrambler initial state bits based on the scrambling code of the instruction frame and uses the descrambler to obtain the indication information based on the scrambler initial state bits. Specifically configured to descramble the instruction frame.

Embodiments of the present invention further provide a system for transmitting data carrying indication information, comprising a plurality of transmitting end nodes shown in FIG. 22 and one receiving end node shown in FIG.

A receiving end node may receive indication frames sent by multiple transmitting end nodes. In particular, a receiving end node may receive indication frames simultaneously transmitted by multiple transmitting end nodes.

FIG. 24 is a schematic structural diagram of Embodiment 5 of a transmitting end node according to the present invention. As shown in FIG. 24, the transmitting end node includes processor 2401 and transmitter 2402 .

The processor 2401 is configured to generate an indication frame, the indication frame carrying a receiver address, a basic service set identifier BSSID and a flag bit, the flag bit being the BSSID and a Used to identify information about a location in a .

Transmitter 2402 is configured to transmit an indication frame to a receiving end node.

The transmitting end node is configured to implement the embodiment of the method corresponding to FIG. 14, the implementation principle and technical effect thereof are similar, and the detailed description is omitted here.

In another embodiment, the processor 2401 sets the value of a flag bit in the original indication frame to a first value to generate the indication frame if the receiver address of the original indication frame is the BSSID, or , if the receiver address of the original indication frame is not the BSSID, to generate the indication frame, set the value of the flag bit in the original indication frame to a second value, and add the BSSID to the original indication frame. specifically configured.

Based on the previous embodiment, the indication frame is a clear to send ( CTS ) frame. Thus, the flag bit is a bit within the receiver address field within the CTS frame, or the flag bit is at least one bit within the frame control field within the CTS frame.

FIG. 25 is a schematic structural diagram of Embodiment 4 of a receiving end node according to the present invention. As shown in FIG. 25, the receiving end node includes receiver 2501 and processor 2502 .

The receiver 2501 is configured to receive an indication frame sent by a transmitting end node, the indication frame carrying a receiver address, a BSSID, and flag bits, the flag bits being the BSSID and an indication frame. Used to identify information about a position within a frame.

The processor 2502 determines whether the receiver address of the indication frame is the same as the address of the receiving end node based on the receiver address, and if not, based on the BSSID, the receiving node receives the indication frame. It is configured to determine whether to stop data transmission within a preset time indicated within.

The receiving end node is configured to implement the embodiment of the method corresponding to FIG. 16, the implementation principle and technical effect thereof are similar, and the detailed description is omitted here.

In another embodiment, the processor 2502 is specifically configured to determine whether the receiving end node and the transmitting end node belong to the same BSS based on the BSSID, and if they belong to the same BSS, the receiving end node is determined to stop data transmission within a preset time indicated in the instruction frame, and if it does not belong to the same BSS, it is determined that the receiving end node may continue data transmission. .

The flag bit is the BSSID and is used to identify information about the location within the instruction frame, when the flag bit is the first value, the receiver address of the instruction frame is the BSSID. or identifying that the receiver address of the indication frame is not a BSSID when the flag bit is the second value.

When the flag bit is the second value, the indication frame is identified as containing a BSSID field, and the BSSID field contains the BSSID.

In another embodiment, the flag bit is the first bit in the receiver address field in the instruction frame. Therefore, the processor 2502 converts the value of the first bit in the receiver address in the instruction frame to a second value if the value of the first bit is the first value, and obtains after the conversion determining whether the received receiver address is the same as the address of the receiving end node, or if the value of the first bit is the second value, the receiver address of the instruction frame is the address of the receiving end node; It is specifically configured to determine if it is the same as the address.

In another embodiment, the flag bit is at least one bit within a frame control field within the instruction frame. Accordingly, processor 2502 is specifically configured to determine whether the receiver address of the indication frame is the same as the address of the receiving end node.

Based on the previous embodiment, the instruction frame may be a CTS frame.

Finally, it should be noted that the foregoing embodiments are only for describing the technical solutions of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, a person skilled in the art can find other methods described in the foregoing embodiments without departing from the scope of the technical solutions of the embodiments of the present invention. It should be understood that the provided technical solution can be further modified and some or all of its technical features can be equivalently replaced.

701 generation module 702 transmission module 703 scrambling module 901 reception module 902 acquisition module 2001 generation module 2002 transmission module 2101 reception module 2102 determination module 2201 processor 2202 transmitter 2301 receiver 2302 processor 2401 processor 2402 transmitter 2501 receiver 2502 processor

Claims (13)

A method for transmitting data carrying instructional information, comprising:
generating a media access control MAC frame by a transmitting end node;
scrambling the MAC frame using a scrambler by the transmitting end node;
transmitting the MAC frame to a receiving end node by the transmitting end node;
the MAC frame includes an indication field, the indication field including a plurality of bits;
one bit of the plurality of bits indicates whether one 20 MHz channel corresponding to the one bit is available;
The MAC frame further includes a receiver address, a basic service set identifier BSSID, and flag bits, wherein the flag bits are the BSSID and are used to identify information about location within the MAC frame. ,
The value of the flag bit is a first value indicating that the receiver address of the MAC frame is the BSSID, or the value of the flag bit indicates that the receiver address of the MAC frame is not the BSSID. A second value that indicates the method. 2. The method of claim 1, wherein the number of bits is 8 bits. 3. The method of claim 1 or 2, wherein a bit value of '1' among the plurality of bits indicates that a channel corresponding to that bit is available. A method for receiving data in a wireless local area network, comprising:
receiving a media access control MAC frame by a receiving end node;
descrambling the MAC frame using a descrambler by the receiving end node;
the MAC frame includes an indication field, the indication field including a plurality of bits;
one bit of the plurality of bits indicates whether one 20 MHz channel corresponding to the one bit is available;
The MAC frame further includes a receiver address, a basic service set identifier BSSID, and flag bits, wherein the flag bits are the BSSID and are used to identify information about location within the MAC frame. ,
The value of the flag bit is a first value indicating that the receiver address of the MAC frame is the BSSID, or the value of the flag bit indicates that the receiver address of the MAC frame is not the BSSID. A second value that indicates the method. 5. The method of claim 4, wherein the number of bits is 8 bits. 6. The method of claim 4 or 5, wherein a bit value '1' of the plurality of bits indicates that the channel corresponding to that bit is available. A transmitting end node for transmitting data in a wireless local area network, the transmitting end node comprising one or more modules,
the one or more modules configured to generate a media access control MAC frame;
the one or more modules configured to scramble the MAC frames using a scrambler;
the one or more modules are further configured to transmit the MAC frame to a receiving end node;
the MAC frame includes an indication field, the indication field including a plurality of bits;
one bit of the plurality of bits indicates whether one 20 MHz channel corresponding to the one bit is available;
The MAC frame further includes a receiver address, a basic service set identifier BSSID, and flag bits, wherein the flag bits are the BSSID and are used to identify information about location within the MAC frame. ,
The value of the flag bit is a first value indicating that the receiver address of the MAC frame is the BSSID, or the value of the flag bit indicates that the receiver address of the MAC frame is not the BSSID. Transmitting end node, which is a second value that indicates the . 8. The transmitting end node according to claim 7, wherein the number of said plurality of bits is 8 bits. 9. The transmitting end node according to claim 7 or 8, wherein a bit value '1' of said plurality of bits indicates that a channel corresponding to that bit is available. A receiving end node for receiving data in a wireless local area network, said receiving end node comprising one or more modules,
the one or more modules configured to receive a media access control MAC frame;
the one or more modules configured to descramble the MAC frames using a descrambler;
the MAC frame includes an indication field, the indication field including a plurality of bits;
one bit of the plurality of bits indicates whether one 20 MHz channel corresponding to the one bit is available;
The MAC frame further includes a receiver address, a basic service set identifier BSSID, and flag bits, wherein the flag bits are the BSSID and are used to identify information about location within the MAC frame. ,
The value of the flag bit is a first value indicating that the receiver address of the MAC frame is the BSSID, or the value of the flag bit indicates that the receiver address of the MAC frame is not the BSSID. A receiving node that is a second value that indicates the 11. The receiving end node of claim 10, wherein the number of bits is 8 bits. 12. The receiving end node according to claim 10 or 11, wherein a bit value '1' of said plurality of bits indicates that the channel corresponding to that bit is available. A computer-readable storage medium containing instructions that, when executed by a computer, cause said computer to perform the method of any one of claims 1-6.

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