WO2017133336A1

WO2017133336A1 - Information transmission method and node

Info

Publication number: WO2017133336A1
Application number: PCT/CN2016/111183
Authority: WO
Inventors: 李波; 杨懋; 韩霄; 林梅露; 郭宇宸; 周荀; 李云波
Original assignee: 华为技术有限公司
Priority date: 2016-02-02
Filing date: 2016-12-20
Publication date: 2017-08-10

Abstract

Provided in an embodiment of the invention are an information transmission method and node. The information transmission method can comprise: a first node receives a request message transmitted by a second node, the first node and the second node being located in the same BSS; and the first node transmits a response message to the second node, the response message comprising an identifier of the BSS where the first node is located. The embodiment of the invention can increase the throughput of a network.

Description

Information transmission method and node

This application claims priority to the CN Patent Application filed on July 20, 2016, the application number is 201610575903.1, and the invention name is "Information Transmission Method and Node". This application is required to be submitted to China on February 2, 2016. The priority of the CN Patent Application, which is hereby incorporated by reference in its entirety in its entirety in the the the the the the the the the the

Technical field

The embodiments of the present invention relate to communication technologies, and in particular, to an information transmission method and a node.

Background technique

Wireless Local Area Network (WLAN) technology has become one of the main network access technologies due to its high speed and low cost.

In a WLAN system, before a node performs data transmission on a channel, it needs to perform channel estimation on the channel according to a Clear Channel Assessment (CCA) threshold. The result of the channel evaluation is that the channel is idle, and the node can perform data transmission on the channel. In a dense deployment scenario, the coverage of multiple Basic Service Sets (BSSs) may overlap to form an Overlap Basic Service Set (OBSS). The node in the OBSS can receive the signal sent by other nodes in the BSS where the node is located on one channel, and can also receive the signal sent by other nodes in the OBSS. That is to say, the node in the OBSS can receive signals sent by nodes in different BSSs. If the node sends the same CCA threshold for channel estimation for the signals sent by the nodes in different BSSs received on the channel, the channel estimation may be inaccurate, resulting in low data transmission efficiency and low network throughput in the WLAN system. .

Therefore, how to distinguish the signals sent by nodes in different BSSs received by the nodes is particularly important.

Summary of the invention

Embodiments of the present invention provide an information transmission method and a node, so that a node pair receives The BSS of the sending node of the message is distinguished.

Embodiment 1 of the present invention provides an information transmission method, including:

The first node receives the request message sent by the second node; the first node is located in the same BSS as the second node;

The first node sends a response message to the second node, where the response message includes an identifier of the BSS where the first node is located.

Optionally, the identifier of the BSS where the first node is located includes a BSS Color; and the identifier of the BSS where the first node is located is located in a duration field of the response message.

Optionally, the identifier of the BSS where the first node is located is located in a preset bit field in the duration field of the response message.

Optionally, the response message further includes carrying indication information, and the carrying indication information is used to indicate to the third node that the preset bit in the duration field of the response message has an identifier of the BSS where the first node is located.

Optionally, the comparison between the duration of the duration field of the response message and the preset threshold is used to indicate to the third node that the preset bit in the duration field of the response message exists in the BSS where the first node is located. Logo.

Optionally, the duration corresponding to the duration field of the request message is a first duration; the first duration is a duration determined by the second node according to the duration of the duration field of the response message to be received, the SIFS, and the duration of the preset response message transmission. The preset bit field of the duration field of the to-be-received response message includes the identifier of the BSS where the second node is located;

Before the first node sends a response message to the second node, the method further includes:

The first node determines the second duration according to the first duration, the SIFS, and the preset response message transmission duration; and the duration corresponding to the duration field in the response message is the second duration.

Optionally, before the first node determines the second duration according to the first duration, the SIFS, and the preset response message transmission duration, the method may further include:

The first node determines a preset response message transmission duration according to the preset transmission rate.

Optionally, the preset transmission rate is any one of a primary rate of the first node, a rate corresponding to the MCS of the first node, and a rate corresponding to the MCS of the second node; the MCS of the second node may be the first node according to the request. The message is ok.

Optionally, before the first node sends the response message to the second node, the method may further include:

The first node configures the preset bit of the duration field of the response message as an identifier of a BSS where the first node is located;

The first node configures other bits of the duration field of the response message according to the preset duration, such that the duration corresponding to the duration field of the response message is greater than or equal to the preset duration.

The embodiment of the invention further provides another information transmission method, including:

The third node listens to the response message sent by the first node to the second node, where the response message includes the identifier of the BSS where the first node is located; the first node and the second node are located in the same BSS;

The third node determines, according to the response message, an identifier of the BSS where the first node is located;

The third node determines whether the first node and the third node are located in the same BSS according to the identifier of the BSS where the first node is located and the identifier of the BSS where the third node is located.

Optionally, the third node determines, according to the identifier of the BSS where the first node is located, and the identifier of the BSS where the third node is located, whether the first node and the third node are located in the same BSS, and may include:

The third node compares the identifier of the BSS where the first node is located with the identifier of the BSS where the third node is located;

If the identifier of the BSS where the first node is located is different from the identifier of the BSS where the third node is located, the third node determines that the first node and the third node are located in different BSSs.

Optionally, the identifier of the BSS where the first node is located includes the BSS Color, and the third node determines, according to the response message, the identifier of the BSS where the first node is located, including:

The third node determines the identity of the BSS where the first node is located according to the duration field of the response message.

Optionally, the third node determines, according to the duration field of the response message, that the identifier of the BSS where the first node is located includes:

The third node determines the identifier of the BSS where the first node is located according to the preset bit in the duration field of the response message.

Optionally, the response message further includes carrying indication information, and the third node determines, according to the preset bit in the duration field of the response message, the identifier of the BSS where the first node is located, including:

The third node determines, according to the carrying indication information, a preset in the duration field of the response message. Whether the bit has the identifier of the BSS where the first node is located;

If the preset bit has the identifier of the BSS where the first node is located, the third node determines the identifier of the BSS where the first node is located according to the preset bit in the duration field of the response message.

Optionally, the third node determines, according to the preset bit in the duration field of the response message, the identifier of the BSS where the first node is located, and may include:

The third node determines, according to the comparison result of the duration of the duration field of the response message and the preset threshold, whether the preset bit in the duration field of the response message has the identifier of the BSS where the first node is located;

Optionally, the duration corresponding to the duration field of the response message is a second duration; the second duration is determined by the first node according to the first duration, the SIFS, and the preset transmission duration;

The first duration is the duration corresponding to the duration field in the request message sent by the second node to the first node; the first duration is the length of the second node according to the duration of the response message to be received, the SIFS, and the preset transmission duration. The determined duration; the preset bit of the duration field of the response message to be received includes the identifier of the BSS where the second node is located.

Optionally, the preset transmission duration is determined by the first node according to the preset transmission rate; the preset transmission rate is the primary rate of the first node, the rate corresponding to the MCS of the first node, and the rate corresponding to the MCS of the second node. Any rate; the MCS of the second node can be determined for the request message.

Optionally, the duration corresponding to the duration field of the response message is that the first node configures the preset bit as the identifier of the BSS where the first node is located, and configures other bits of the duration field of the response message according to the preset duration. The length of time greater than or equal to the preset duration.

Optionally, the method may further include:

If the first node and the third node are located in different BSSs, the third node determines a CCA threshold corresponding to the OBSS; the CCA threshold corresponding to the OBSS is greater than or equal to a CCA threshold corresponding to the BSS where the third node is located;

The third node performs channel estimation according to the CCA threshold corresponding to the OBSS;

If the channel evaluation result is that the channel is idle, the third node transmits a message on the channel.

Optionally, the response message further includes an SR indication information.

If the channel evaluation result is that the channel is idle, the third node transmitting the message on the channel includes:

If the channel evaluation result is that the channel is idle, and the SR indication information is the permission indication information, the third node transmits the message on the channel.

An embodiment of the present invention further provides a node, where the node is a first node, and includes: a receiver and a transmitter;

a receiver, configured to receive a request message sent by the second node; the first node and the second node are located in the same BSS;

And a transmitter, configured to send a response message to the second node, where the response message includes an identifier of the BSS where the first node is located.

Optionally, the comparison between the duration of the duration field of the response message and the preset threshold is used to indicate to the third node that the preset bit in the duration field of the response message has the identifier of the BSS where the first node is located. .

Optionally, the duration corresponding to the duration field of the request message is a first duration; the first duration is a duration determined by the second node according to the duration of the duration field of the response message to be received, the SIFS, and the duration of the preset response message transmission. The preset bit field of the duration field of the to-be-received response message includes: an identifier of the BSS where the second node is located;

The node may also include: a processor;

The processor is configured to determine a second duration according to the first duration, the SIFS, and the preset response message transmission duration; and the duration corresponding to the duration field in the response message is the second duration.

Optionally, the processor is further configured to determine a preset response message transmission duration according to the preset transmission rate.

Optionally, the processor is further configured to configure a preset bit of the duration field of the response message as an identifier of the BSS where the first node is located; and a duration field of the response message according to the preset duration The other bits are configured such that the duration of the response message duration is greater than or equal to the preset duration.

The embodiment of the present invention further provides a node, where the node is a third node, which may include: a receiver and a processor;

a receiver, configured to monitor a response message sent by the first node to the second node, where the response message includes: an identifier of the BSS where the first node is located; the first node and the second node are located in the same BSS;

The processor is configured to determine, according to the response message, the identifier of the BSS where the first node is located; determine whether the first node and the third node are located in the same BSS according to the identifier of the BSS where the first node is located and the identifier of the BSS where the third node is located.

Optionally, the processor is further configured to compare the identifier of the BSS where the first node is located with the identifier of the BSS where the third node is located; if the identifier of the BSS where the first node is located is different from the identifier of the BSS where the third node is located, determine the first node. Located in a different BSS than the third node.

Optionally, the identifier of the BSS where the first node is located includes a BSS Color, and the processor is further configured to determine, according to a duration field of the response message, an identifier of the BSS where the first node is located.

Optionally, the processor is further configured to determine, according to the preset bit in the duration field of the response message, the identifier of the BSS where the first node is located.

Optionally, the response message further includes: carrying the indication information; the processor is further configured to: according to the carrying indication information, determining whether the preset bit in the duration field of the response message has the identifier of the BSS where the first node is located; The bit exists in the identifier of the BSS where the first node is located, and the identifier of the BSS where the first node is located is determined according to the preset bit in the duration field of the response message.

Optionally, the processor is further configured to determine, according to the comparison between the duration of the duration field of the response message and the preset threshold, whether the preset bit in the duration field of the response message exists in the BSS of the first node. If the preset bit has the identifier of the BSS where the first node is located, the identifier of the BSS where the first node is located is determined according to the preset bit in the duration field of the response message.

The information transmission method and the node provided by the embodiment of the present invention, after receiving the request message sent by the second node in the same BSS, the first node sends a response message to the second node, because the response message includes the first node. The identity of the BSS, which allows the third node to monitor The response message to the BSS determines the identity of the BSS where the first node is located, and determines whether the first node and the third node are located in the same BSS according to the identifier of the BSS where the first node is located and the identifier of the BSS where the third node is located. That is to say, the method can enable the third node to distinguish the BSS where the transmitting node of the monitored signal is located, so that the channel assessment can be performed by using the corresponding CCA threshold according to the differentiation result, thereby improving channel estimation accuracy and improving data transmission efficiency. To improve network throughput.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1A is a structural diagram of a network system to which an information transmission method according to various embodiments of the present invention is applied;

FIG. 1B is a flowchart of an information transmission method according to Embodiment 1 of the present invention; FIG.

2 is a schematic diagram of a frame structure of a wireless local area network according to Embodiment 2 of the present invention;

FIG. 3 is a schematic diagram of another wireless local area network frame structure according to Embodiment 2 of the present invention; FIG.

4 is a schematic structural diagram of a frame control domain according to Embodiment 2 of the present invention;

FIG. 5 is a flowchart of an information transmission method according to Embodiment 2 of the present invention;

FIG. 6 is a flowchart of another information transmission method according to Embodiment 2 of the present invention;

FIG. 7 is a flowchart of another information transmission method according to Embodiment 2 of the present invention;

FIG. 8 is a flowchart of an information transmission method according to Embodiment 3 of the present invention;

FIG. 9 is a flowchart of an information transmission method according to Embodiment 3 of the present invention;

10 is a network architecture diagram corresponding to an uplink data transmission to which the information transmission method according to Embodiment 3 of the present invention is applied;

11 is a network architecture diagram of a D2D data transmission corresponding to an information transmission method according to Embodiment 3 of the present invention;

FIG. 12 is a flowchart of an information transmission method according to Embodiment 4 of the present invention;

FIG. 13 is a flowchart of an information transmission method according to Embodiment 5 of the present invention;

FIG. 14 is a schematic structural diagram of a node according to Embodiment 6 of the present invention; FIG.

FIG. 15 is a schematic structural diagram of a node according to Embodiment 7 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Each information transmission method provided by the embodiment of the present invention is applicable to a WLAN system, especially a WLAN system in a dense deployment scenario. The information transmission method provided by the embodiments of the present invention can be applied to each node in two adjacent BSSs in a WLAN system in a dense deployment scenario. FIG. 1A is a structural diagram of a network system to which an information transmission method according to various embodiments of the present invention is applied. As shown in FIG. 1A, the network system may include two neighboring BSSs, namely a first BSS and a second BSS, wherein each BBS includes an AP and at least one station. The first BSS and the second BSS form an OBSS due to overlapping of coverage areas. The station in the OBSS can receive the signal sent by other nodes in the BSS where the station is located, and can also receive the signal sent by other nodes in the OBSS, that is, the station in the OBSS can receive the first BSS. The signal sent by the node may also receive the signal sent by the node in the second BSS. The information transmission method provided by the embodiment of the present invention can enable a node located in the OBSS to distinguish signals received by nodes in different BSSs, thereby performing channel estimation by using a corresponding CCA threshold, thereby improving channel estimation accuracy. Improve data transmission efficiency and increase network throughput.

Embodiment 1 of the present invention provides an information transmission method. The method may be performed by a node, which may be a station (STA) or an access point (AP). FIG. 1B is a flowchart of an information transmission method according to Embodiment 1 of the present invention. As shown in FIG. 1B, the method can include:

S101. The first node receives a request message sent by the second node. The first node is located in the same BSS as the second node.

Specifically, if the second node has data to be transmitted to the first node, the request message is sent to the first node. The second node may be, for example, a site, and the first node may be Thought the site or AP. If the first node and the second node are both sites, the information transmission method may be applicable to a transmission scenario of a device and a device (Device To Device, D2D for short).

S102. The first node sends a response message to the second node, where the response message includes an identifier of the BSS where the first node is located.

Specifically, after receiving the request message, the first node may indicate, by using the response message, the transmission duration of the subsequent interaction to the second node. That is, the response message may include the duration indicated by the first node in addition to the identifier of the BSS where the first node is located.

The first node and the second node are located in the same BSS, and the identifier of the BSS where the first node is located is the same as the identifier of the BSS where the second node is located.

S103. The third node determines, according to the received response message, the identifier of the BSS where the first node is located, and determines the first node and the third according to the identifier of the BSS where the first node is located and the identifier of the BSS where the third node is located. Whether the nodes are in the same BSS.

Specifically, the third node may monitor the response message sent by the first node to the second node, and the third node may be located in the same BSS as the first node, or the third node and the third node A node is located in a different BSS within the OBSS.

The third node may be, for example, comparing the identifier of the BSS where the first node is located with the identifier of the BSS where the third node is located, and if the identifier of the BSS where the first node is located is the same as the identifier of the BSS where the third node is located, the third node The node determines that the third node and the first node are respectively located in different BSSs within the OBSS; if the identifier of the BSS where the first node is located is the same as the identifier of the BSS where the third node is located, the third node determines the third node And the first node is located in the same BSS.

If the third node determines that the first node is located in the same BSS as the third node, the third node may further perform channel estimation according to a CCA threshold corresponding to the BSS where the third node is located; if the third node determines the first node A node and the third are located in different BSSs within the OBSS, and the third node may also perform channel estimation according to the CCA threshold corresponding to the OBSS.

The information transmission method provided by the first embodiment of the present invention, after receiving the request message sent by the second node in the same BSS, the first node sends a response message to the second node, because the response message includes the first node The identifier of the BSS is such that the third node determines the identifier of the BSS where the first node is located according to the received response message, and determines the first node according to the identifier of the BSS where the first node is located and the identifier of the BSS where the third node is located. With the third Whether the nodes are in the same BSS. That is to say, the method can enable the third node to distinguish the BSS where the transmitting node of the monitored signal is located, so that the channel assessment can be performed by using the corresponding CCA threshold according to the differentiation result, thereby improving channel estimation accuracy and improving data transmission efficiency. To improve network throughput.

Optionally, the identifier of the BSS where the first node is located may be located in a Medium Access Control (MAC) header of the response message.

Specifically, the response message may be in the form of a wireless local area network frame. FIG. 2 is a schematic diagram of a frame structure of a wireless local area network according to Embodiment 2 of the present invention. As shown in FIG. 2, the WLAN frame mainly includes: a preamble, a service domain, a MAC header, a data payload, and a Frame Check Sequence (FCS). If the identifier of the BSS where the first node is located is located in the MAC header of the response message, it may be an idle or multiplexed field carried in the MAC header. It should be noted that the identifier of the BSS where the first node is located may also be the new field of the WLAN frame that is carried in the response message, and details are not described herein again.

Optionally, the identifier of the BSS where the first node is located includes a BSS Color; the identifier of the BSS where the first node is located is in a duration field of the response message; and the duration field is located in the MAC header.

For example, the second embodiment of the present invention further provides another wireless local area network frame. FIG. 3 is a schematic diagram of another wireless local area network frame structure according to Embodiment 2 of the present invention. As shown in FIG. 3, the WLAN frame may include a preamble, a service domain, a MAC header, a data payload, and an FCS. The MAC header includes: a Frame Control field, a Duration field, and a Receive Address (RA) field. The frame control field may be 2 bytes or 16 bits, and the duration field may be 2 bytes or 16 bits, and the RA field may be 6 bytes or 48 bits.

The identifier of the BSS where the first node is located may be, for example, a duration field in the response message as shown in FIG.

Optionally, the identifier of the BSS where the first node is located is located in a preset bit length in the duration field of the response message.

Specifically, the identifier of the BSS where the first node is located is located at a lowest preset number of bits, such as 4 bits, of the duration field of the response message.

For example, the duration field of the response message may include 1 bit of indication information. If If the indication information is 0, the subsequent 15 bits are the duration indicated by the first node. The identifier of the BSS where the first node is located may, for example, be located in the lowest 4 bits of the duration information in the duration field of the response message. If the duration field includes 16 bits of bit 0-bit 15. The bit 15 may be the duration indication information. If the bit 15 is 0, the duration corresponding to the bit 0-bit 14 is the duration indicated by the first node. The identifier of the BSS where the first node is located may be located in four bits of bit 0-bit 3.

It should be noted that the preset bit may also be other number of bits, such as 5 bits or 6 bits, and details are not described herein again.

Optionally, the response message further includes: carrying indication information; the carrying indication information is located in a physical header of the response message or the MAC header. The carrying indication information is used to indicate to the third node that the preset bit in the duration field of the response message has an identifier of the BSS where the first node is located.

Specifically, the physical header of the response message may be a preamble of the wireless local area network frame in FIG. 2 or FIG. 3 as described above. The carrying indication information may be located in a physical header of the response message or a reserved field, a reusable field or a newly added field of the MAC header. The carrying indication information may be one bit or multiple bits.

For example, if the carrying indication information is one bit, the one bit is 1, the carrying indication information is used to indicate to the third node that the preset bit in the duration field of the response message exists in the first node. The identity of the BSS.

The carry indication information may be, for example, located in a frame control field of a MAC header of the response message. FIG. 4 is a schematic structural diagram of a frame control domain according to Embodiment 2 of the present invention. As shown in FIG. 4, the frame control field may include: 16 bits of bit 0-bit 15. The bit 0 and the bit 1 can be a protocol version, the bit 2 and the bit 3 can be a type, the bit 4 - bit 7 can be a subtype, and the bit 8 can be a distributed system (To Distribution System, To DS for short) ), bit9 can be from the distributed system (From DS), bit10 can be more tags (More Frag), bit11 is retry, bit12 is energy management (power management), bit13 is more data (more data) ), bit 14 is a Protected Frame, and bit 15 is an Order.

If the carrying indication information is located in a frame control domain of the MAC header of the response message, the carrying indication information may be located in bits 8-bit11 and bit13-bit15 in the frame control domain as shown in FIG. Any bit in the middle. If the carrying indication information is one bit information, the carrying indication information may be located in any one of bits 8-bit11 and bit13-bit15 in the frame control domain as shown in FIG.

The carrying indication information may also be a preset scramble seed or a preset bit in a scrambled seed. The third node may determine a scrambled seed of the first node according to the service domain in the response message, and determine the carrying indication information according to the scrambled seed of the first node.

Alternatively, the comparison between the duration of the duration field of the response message and the preset threshold is used to indicate to the third node that the preset bit in the duration field of the response message exists. The ID of the BSS where the node is located.

Specifically, if the comparison structure is that the duration corresponding to the duration field of the response message is greater than or equal to the preset threshold, the comparison result is used to indicate to the third node the preset bit in the duration field of the response message. The bit exists in the identity of the BSS where the first node is located.

Optionally, the duration corresponding to the duration field of the request message is a first duration.

FIG. 5 is a flowchart of an information transmission method according to Embodiment 2 of the present invention. As shown in FIG. 5, before the first node receives the request message sent by the second node in S101 of the method of the foregoing embodiment, the method may further include:

S501: The second node determines a first duration according to a duration, a short interframe space (SIFS), and a preset response message transmission duration of the duration of the response message to be received; and the response message to be received The preset bit of the duration field includes: an identifier of the BSS where the second node is located.

For example, the second node may determine the first duration according to the duration of the duration field of the to-be-received response message, the sum of the SIFS and the preset response message transmission duration.

S502. The second node sends the request message to the first node, where the duration of the duration of the request message corresponds to the first duration.

Optionally, before the first node sends a response message to the second node in the S102, the method further includes:

S503. The first node determines a second duration according to the first duration, the SIFS, and the duration of the preset response message transmission.

For example, the first node may sequentially subtract the SIFS and the preset response according to the first duration. The second duration is determined by the length of time the message transmission duration is obtained.

S504. The first node sends the response message to the second node. The duration of the duration field in the response message is the second duration.

Optionally, before the first node determines the second duration according to the first duration, the SIFS, and the preset response message transmission duration, the method further includes:

S503a. The first node determines the preset response message transmission duration according to the preset transmission rate.

The preset transmission rate is the primary rate of the first node, the rate corresponding to the Modulation and Coding Scheme (MCS) of the first node, and the rate corresponding to the MCS of the second node. Any rate; the MCS of the second node may be determined by the first node according to the request message.

Specifically, the primary rate of the first node may be that the first node selects a rate less than or equal to the request message from a basic rate set corresponding to the BSS of the first node, and the ratio is less than or equal to The maximum rate in the rate of the request message is taken as the primary rate of the first node.

The preset transmission rate may also be, for example, a rate corresponding to the number of streams of the first node.

FIG. 6 is a flowchart of another information transmission method according to Embodiment 2 of the present invention. As shown in FIG. 6, before the first node sends a response message to the second node in S102 of the method of the foregoing embodiment, the method may further include:

S601. The first node configures the preset bit of the duration field of the response message as an identifier of the BSS where the first node is located.

S602. The first node configures other bits of the duration field of the response message according to the preset duration, such that the duration corresponding to the duration field of the response message is greater than or equal to a preset duration.

For example, the identifier of the BSS where the first node is located is located in the lowest 4 bits of the duration field of the response message, such as bit0-bit4. The first node may be configured to configure the bit 0-bi3 of the duration field of the response message as the identifier of the BSS where the first node is located, and configure other bits of the duration field of the response message such that the response message continues. The duration of the duration field is greater than or equal to the preset duration. If the duration of the duration field of the response message is less than the preset duration, the first node may add 1 to the bit 4, so that the duration of the response message is The duration of the domain is greater than or equal to the preset duration.

FIG. 7 is a flowchart of another information transmission method according to Embodiment 2 of the present invention. As shown in FIG. 7, optionally, the method may further include:

S701. If the first node and the third node are located in different BSSs, the third node determines a CCA threshold corresponding to the OBSS. The CCA threshold corresponding to the OBSS is greater than or equal to a CCA threshold corresponding to the BSS where the third node is located.

S702. The third node performs channel estimation according to the CCA threshold corresponding to the OBSS.

S703. If the channel evaluation result is that the channel is idle, the third node transmits a message on the channel.

Optionally, the response message further includes: Space Reuse (SR) indication information.

If the channel evaluation result is that the channel is idle in S703, the transmitting, by the third node, the message on the channel includes:

If the channel evaluation result is that the channel is idle, and the SR indication information is the permission indication information, the third node transmits a message on the channel.

Optionally, the CCA threshold corresponding to the OBSS includes: a Packet Detection (PD) level value corresponding to the OBSS. The CCA threshold corresponding to the BSS where the third node is located includes: a PD level value corresponding to the BSS where the third node is located.

Specifically, the CCA threshold corresponding to the BSS where the third node is located may include, for example, a minimum PD level value corresponding to the BSS where the third node is located, such as -82 dBm.

Alternatively, the method may further comprise:

If the first node is in the same BSS as the third node, the third node respects the duration corresponding to the duration field in the response message, and the third node does not need to perform channel estimation, and the duration of the response message is long. No information is transmitted within the duration of the domain.

Optionally, the request message may include: a Request To Send (RTS) frame; the response message may include: a Clear To Send (CTS) frame.

The information transmission method provided by the second embodiment of the present invention provides a plurality of carrying schemes of the identifiers of the BSSs of the first node in the response message, thereby ensuring that the third node can determine that the first node is located according to the monitored message. The identification of the BSS, thereby ensuring that the third node more accurately distinguishes the BSS where the transmitting node of the monitored signal is located, and improves channel estimation. Accuracy, improve data transmission efficiency, and improve network throughput.

Embodiment 3 of the present invention provides an information transmission method. FIG. 8 is a flowchart of an information transmission method according to Embodiment 3 of the present invention. The method provided in the third embodiment is applicable to two adjacent BSSs, that is, a first BSS and a second BSS. The first node and the second node are located in the first BSS, BSS1, and the third node and the fourth node are located in the second BSS, BSS2.

As shown in FIG. 8, the method can include:

S801. The second node sends an RTS frame to the first node.

The second node may send the RTS frame to the first node if there is data to be transmitted to the first node. The second node can be a site, and the first node can be an AP or a site.

For example, if the first node is an AP, the second node may send the RTS frame to the first node if there is uplink data to be transmitted.

If the first node is a station, the second node may send the RTS frame to the first node if the data with D2D needs to be transmitted.

S802. The first node configures a preset bit of a duration field of the CTS frame as an identifier of the BSS where the first node is located.

The identifier of the BSS where the first node is located includes the BSS color.

S803, the first node configures other bits of the duration field of the CTS frame according to the preset duration, such that the duration corresponding to the duration field of the CTS frame is greater than or equal to the preset duration.

S804. The first node sends the CTS frame to the second node.

S805. The third node determines, according to the preset preset bit of the duration field of the CTS frame sent by the first node, the identifier of the BSS where the first node is located.

Optionally, the frame control field of the CTS frame may include carrying indication information, and before the S805, the method may further include:

The third node may determine, according to the carrying indication information, that the preset bit of the duration field of the CTS frame has the identifier of the BSS where the first node is located.

Alternatively, before the S805, the method may further include:

The third node compares the duration corresponding to the duration field of the CTS frame with a preset threshold; if the duration corresponding to the duration field of the CTS frame is greater than or equal to the preset threshold, then determining The preset bit of the duration field of the CTS frame has the identifier of the BSS where the first node is located.

S806. The third node compares the identifier of the BSS where the first node is located and the identifier of the BSS where the third node is located.

S807. If the identifier of the BSS where the first node is located is different from the identifier of the BSS where the third node is located, the third node determines that the third node is located in a different BSS from the first node.

S808. The third node determines a PD level value corresponding to the OBSS, and performs channel estimation according to the PD level value corresponding to the OBSS.

S809. The third node determines, according to the channel assessment result, whether spatial multiplexing is possible.

The third node may, for example, determine that spatial multiplexing may be performed if the channel evaluation result is that the channel is idle.

If the third node is a legacy node, or if the channel evaluation result is that the channel is busy and cannot be spatially multiplexed, the third node may respect the duration corresponding to the duration field in the CTS frame, without performing channel estimation. No information is transmitted within the duration corresponding to the duration field in the CTS frame.

S810. If the third node determines that spatial multiplexing is possible, transmitting data to the fourth node.

It should be noted that the third node may send an RTS frame to the fourth node, receive the CTS frame replied by the fourth node, and transmit data to the fourth node according to the duration corresponding to the CTS frame replied by the fourth node.

S811. The second node transmits data to the first node within a duration corresponding to a duration field of the CTS frame.

Embodiment 3 of the present invention further provides another information transmission method. FIG. 9 is a flowchart of an information transmission method according to Embodiment 3 of the present invention. As shown in FIG. 9, the method can include:

S901: The second node configures a preset bit of the duration field of the CTS frame to be received according to the identifier of the BSS where the second node is located, and determines a duration of the duration field of the CTS frame to be received.

S902. The second node determines the first duration according to the duration of the duration field of the to-be-received response message, the SIFS, and the duration of the preset response message transmission.

S903. The second node configures the duration field of the RTS frame according to the first duration, such that the duration corresponding to the duration field of the RTS frame is the first duration.

S904. The second node sends the RTS frame to the first node.

S905. The first node determines the first duration, and determines the second duration according to the first duration, the SIFS, and the duration of the preset response message transmission.

S906. The first node configures a duration field of the CTS frame according to the second duration, so that the duration corresponding to the duration field of the CTS frame is the second duration.

S907. The first node sends the CTS frame to the second node.

S908. The third node determines, according to the preset preset bit of the duration field of the CTS frame sent by the first node, the identifier of the BSS where the first node is located.

Optionally, the frame control field of the CTS frame may include carrying indication information, and before the S908, the method may further include:

Alternatively, before the S908, the method may further include:

And determining, by the third node, a duration corresponding to the duration of the CTS frame, and a preset threshold; if the duration corresponding to the duration of the CTS frame is greater than or equal to the preset threshold, determining a duration of the CTS frame The preset bit has the identity of the BSS where the first node is located.

S909. The third node compares the identifier of the BSS where the first node is located and the identifier of the BSS where the third node is located.

S910. If the identifier of the BSS where the first node is located is different from the identifier of the BSS where the third node is located, the third node determines that the third node is located in a different BSS from the first node.

S911, the third node determines a PD level value corresponding to the OBSS, and performs channel estimation according to the PD level value corresponding to the OBSS.

S912. The third node determines, according to the channel assessment result, whether spatial multiplexing is possible.

S913. If the third node determines that spatial multiplexing is possible, transmitting the number to the fourth node. according to.

S914. The second node transmits data to the first node within a duration corresponding to a duration field of the CTS frame.

The information transmission method as described above can be applied to an uplink data transmission scenario, and can also be applied to a D2D data transmission scenario.

For example, if the above information transmission method is applicable to an uplink data transmission scenario. FIG. 10 is a network architecture diagram corresponding to an uplink data transmission to which the information transmission method according to Embodiment 3 of the present invention is applicable. As shown in FIG. 10, the information transmission method is applicable to two adjacent BSSs, that is, a first BSS and a second BSS. The first station and the first AP are located in the first BSS, and the second station, the third station, the fourth station, and the second AP are located in the second BSS. The first node may be, for example, the first AP in FIG. The second node can be, for example, the first site in FIG. The third node may be, for example, any one of the second station, the third station, and the fourth station in FIG. 10, and the fourth node may be, for example, the second AP in FIG.

If the information transmission method is applicable to a D2D data transmission scenario. FIG. 11 is a network architecture diagram of a D2D data transmission corresponding to the information transmission method according to Embodiment 3 of the present invention. As shown in FIG. 11, the information transmission method is applicable to two adjacent BSSs, that is, a first BSS and a second BSS. The first site and the second site are located in the first BSS, and the third site, the fourth site, the fifth site, and the sixth site are located in the second BSS. The first node can be, for example, the first site in FIG. The second node can be, for example, the second site in FIG. The third node may be, for example, any one of the third station, the fourth station, and the fifth station in FIG. 11, and the fourth node may be, for example, the sixth station in FIG.

The third embodiment of the present invention provides a plurality of examples to specifically describe the methods in the foregoing embodiments, and the beneficial effects are similar to the foregoing embodiments, and details are not described herein again.

Embodiment 4 of the present invention further provides an information transmission method. FIG. 12 is a flowchart of an information transmission method according to Embodiment 4 of the present invention. As shown in FIG. 12, the method can include:

S1201: The node receives the transmission frame.

This node can be a site or an AP. The transmission frame may include: a number of physical layer aggregation process protocols Physical layer convergence procedure protocol data unit (PPDU).

S1202: The node determines, according to the transmission frame, whether a sending node of the transmission frame is located in the same BSS as the node.

Specifically, the node may determine, according to the PPDU, whether the sending node of the transmission frame and the node are located in the same BSS.

According to the information transmission method provided in Embodiment 4 of the present invention, the node determines, according to the received transmission frame, whether the transmitting node of the transmission frame and the node are located in the same BSS. That is to say, the method can make the node distinguish the BSS where the transmitting node of the monitored signal is located, and thus can use the corresponding CCA threshold to perform channel estimation according to the differentiation result, improve the accuracy of channel estimation, improve data transmission efficiency, and improve Network throughput.

Embodiment 5 of the present invention further provides an information transmission method. FIG. 13 is a flowchart of an information transmission method according to Embodiment 5 of the present invention. As shown in FIG. 13 , in the foregoing embodiment, the node determines, according to the transmission frame, that the sending node of the transmission frame and the node are located in the same BSS according to the transmission frame, and may include:

S1301: The node determines a WLAN standard corresponding to the transmission frame.

S1302: The node determines, according to a WLAN standard supported by other nodes in the BSS where the node is located, and a WLAN standard corresponding to the transmission frame, whether the sending node of the transmission frame and the node are located in the same BSS.

The other node may be an associated node of the node within the BSS where the node is located. The associated node can be an AP.

Optionally, in S1302, the node determines, according to the WLAN standard supported by other nodes in the BSS where the node is located, and the WLAN standard corresponding to the transmission frame, whether the sending node of the transmission frame and the node are located in the same BSS, including :

The node determines whether the WLAN standard supported by other nodes in the BSS of the node includes the WLAN standard corresponding to the transmission frame;

If the WLAN standard supported by the other node does not include the WLAN standard corresponding to the transmission frame, the node determines that the transmitting node of the transmission frame is located in a different BSS from the node.

Specifically, the other node may be an associated node of the node in the BSS where the node is located.

For example, if the node is a site, the associated node of the site in the BSS where the site is located is an AP in the BSS where the site is located. If the WLAN standard supported by the site is the 802.11ax standard, the site may be referred to as a High Efficiency (HE) site.

If the WLAN standard supported by the AP is a traditional WLAN standard, the AP may be referred to as a legacy AP or a non-high efficiency (Non-High Efficiency, abbreviated as Non-HE) AP. If the WLAN standard corresponding to the transmission frame is the 802.11ax standard, the transmission frame may be referred to as an HE PPDU. Since the conventional WLAN standard does not include the 802.11ax standard, the Non-HE AP does not issue an HE PPDU, and thus the station can determine that the transmitting node of the transmission frame is located in a different BSS from the station.

If the WLAN standard supported by the AP is the 802.11n standard, the AP may be referred to as a High Throughput (HT) AP. If the WLAN standard corresponding to the transmission frame is the 802.11ax standard, the PPDU included in the transmission frame may be an HE PPDU. If the WLAN standard corresponding to the transmission frame is the 802.11ac standard, the transmission frame may be a Very High Throughput (VHT) PPDU. Because the 802.11n standard does not include the 802.11ax standard or the 802.11ac standard, the HT AP cannot send the transmission frame corresponding to the 802.11ax standard or the 802.11ac standard, that is, the HT AP cannot send a transmission frame including the HE PPDU or the VHT PPDU. The HT AP does not issue an HE PPDU or a VHT PPDU, and thus the station can determine that the transmitting node of the transmission frame is located in a different BSS from the station.

If the WLAN standard supported by the AP is the 802.11ac standard, the AP may be referred to as a VHT AP. If the WLAN standard corresponding to the transmission frame is the 802.11ax standard, the transmission frame may be a PPDU and may be an HE PPDU. Since the 802.11ac standard does not include the 802.11ax standard, the VHT AP cannot transmit the transmission frame corresponding to the 802.11ax standard, that is, the VHT AP cannot send a transmission frame including the HE PPDU, and the VHT AP does not issue the HE PPDU, and thus the VHT AP does not issue the HE PPDU. The station can determine that the transmitting node of the transmission frame is located in a different BSS than the station.

Optionally, the transmission frame may include: WLAN standard indication information corresponding to the transmission frame; the method further includes:

If the WLAN standard supported by the other node includes the WLAN standard corresponding to the transmission frame, the node determines, according to the WLAN standard indication information, whether the WLAN standard corresponding to the transmission frame is the same as the WLAN standard supported by the sending node of the transmission frame;

If the WLAN standard corresponding to the transmission frame and the WLAN supported by the transmitting node of the transmission frame The standard is different, the node determines that the transmitting node of the transmission frame is located in a different BSS from the node.

Specifically, if the WLAN standard supported by the other node includes the WLAN standard corresponding to the transmission frame, the node further determines, according to the WLAN standard indication information, whether the WLAN standard corresponding to the transmission frame and the WLAN standard supported by the sending node of the transmission frame. Whether they are the same, thereby determining whether the transmitting node of the transmission frame is the other node. If the WLAN standard corresponding to the transmission frame is different from the WLAN standard supported by the transmitting node of the transmission frame, if the sending node of the transmission frame is different from the other node, the node may determine that the sending node of the transmission frame is different from the node. BSS.

The WLAN standard indication information corresponding to the transmission frame may be located in a reserved field or a reusable field in the transmission frame. For example, the WLAN standard indication information corresponding to the transmission frame may be located in a reserved field of a signaling field (SIGnal field, hereinafter referred to as SIG) in the transmission frame.

For example, the WLAN standard supported by the other node, that is, the associated node of the node in the BSS where the node is located, for example, the WLAN standard supported by the AP is the 802.11ac standard, and the AP is a VHT AP. If the WLAN standard corresponding to the transmission frame is the 802.11ac standard, the transmission frame may be a VHT PPDU. If the WLAN standard supported by the transmitting node of the transmission frame is the 802.11ax standard, the transmitting node of the transmission frame is a HE AP. Although the VHT AP can send a transmission frame corresponding to the 802.11ac standard, that is, a VHT PPDU, since the HE AP can also issue a VHT PPDU, the node also needs to determine the WLAN standard corresponding to the transmission frame according to the WLAN standard indication information. Whether the latest WLAN standards supported by the transmitting node of the transmission frame are the same. If the VHT PPDU is sent by the HE AP, the node may determine that the transmitting node of the transmission frame is located at a different BSS than the node. The WLAN standard corresponding to the transmission frame is the 802.11ac standard, and the WLAN standard indication information corresponding to the transmission frame may be located in a reserved field or a multiplexable field in the transmission frame, such as a Very High Throughput-SIGnal field. VHT-SIG) A in the reserved field.

The WLAN standard supported by the other node is the associated node in the BSS where the node is located. For example, the WLAN standard supported by the AP is the 802.11n standard, and the AP is an HT AP. If the WLAN standard corresponding to the transmission frame is the 802.11n standard, the transmission frame may be an HT PPDU. If the WLAN standard supported by the transmitting node of the transmission frame is the 802.11ax standard, the transmitting node of the transmission frame is a HE AP. Although the HT AP can also send a transmission frame corresponding to the 802.11n standard, that is, an HT PPDU, since the HE AP can also issue an HT PPDU, the node It is also determined according to the WLAN standard indication information whether the WLAN standard corresponding to the transmission frame is the same as the WLAN standard supported by the transmitting node of the transmission frame. If the HT PPDU is sent by the HE AP, the node may determine that the transmitting node of the transmission frame is located at a different BSS than the node. If the WLAN standard corresponding to the transmission frame is the 802.11n standard, the WLAN standard indication information corresponding to the transmission frame may be located in a reserved field or a multiplexable field in the transmission frame, such as a High Throughput-SIGnal field. HT-SIG) in the reserved field.

The WLAN standard supported by the other node is the associated node in the BSS where the node is located. For example, the WLAN standard supported by the AP is a traditional WLAN standard, and the AP is a non-HT AP. If the WLAN standard corresponding to the transmission frame is a legacy WLAN standard, the transmission frame may include a non-HT PPDU. If the WLAN standard supported by the transmitting node of the transmission frame is the 802.11ax standard, the transmitting node of the transmission frame is a HE AP. Although the non-HT AP can also send a transmission frame corresponding to the traditional WLAN standard, that is, a non-HT PPDU, since the HE AP can also issue a non-HT PPDU, the node also needs to determine the WLAN standard indication information according to the WLAN standard indication information. Whether the WLAN standard corresponding to the transmission frame is the same as the WLAN standard supported by the transmitting node of the transmission frame. If the non-HT PPDU is sent by the HE AP, the node may determine that the transmitting node of the transmission frame is located at a different BSS than the node. If the WLAN standard corresponding to the transmission frame is a traditional standard, the WLAN standard indication information corresponding to the transmission frame may be located in a reserved field in the transmission frame or a multiplexable field, such as a reserved field of the SIG.

Alternatively, if the transmission frame is a downlink transmission frame, the transmission frame may further include: SR indication information.

Specifically, the SR indication information may be located in a reserved field or a reusable field in the transmission frame. For example, the SR indication information may be located in a reserved field of the SIG in the transmission frame.

In the S1302, the node determines, according to the transmission frame, that the sending node of the transmission frame is located in the same BSS as the node, and may include:

The node determines, according to the SR indication information, whether the transmitting node of the transmission frame and the node are located in the same BSS.

Optionally, the node determines, according to the SR indication information, whether the sending node of the transmission frame is located in the same BSS as the node, including:

If the SR indication information is the permission indication information, the node determines that the transmitting node of the transmission frame is located in a different BSS from the node.

Alternatively, if the transmission frame is an uplink transmission frame, the transmission frame may further include: a Partial Association Identification (PAID) corresponding to the receiving node of the transmission frame.

In the S1302, the node determines, according to the transmission frame, whether the sending node of the transmission frame is located in the same BSS as the node, and may include:

The node determines, according to the partial association identifier corresponding to the receiving node of the transmission frame, and the partial association identifier of the BSS where the node is located, whether the receiving node of the transmission frame and the node are located in the same BSS; the receiving node of the transmission frame and the transmission The sending nodes of the frame are located in the same BSS.

Specifically, if the transmission frame is an uplink transmission frame, the receiving node of the transmission frame may be an AP, and the transmission frame may include: a PAID corresponding to the AP.

Optionally, the node determines, according to the partial association identifier corresponding to the receiving node of the transmission frame, and the partial association identifier of the BSS where the node is located, whether the receiving node of the transmission frame and the node are located in the same BSS, including:

The node compares a partial association identifier corresponding to the receiving node of the transmission frame, and a partial association identifier of the BSS where the node is located;

If the partial association identifier corresponding to the sending node of the transmission frame is different from the partial association identifier of the BSS where the station is located, the node determines that the sending node of the transmission frame is located in a different BSS from the node.

Optionally, the method may further include:

If the transmitting node and the node of the transmission frame are located in different BSSs, the node determines a CCA threshold corresponding to the OBSS; the CCA threshold corresponding to the OBSS is greater than or equal to a CCA threshold corresponding to the BSS where the node is located;

The node performs channel estimation according to the CCA threshold corresponding to the OBSS;

If the channel evaluation result is that the channel is idle, the node transmits a message on the channel.

Optionally, if the transmission frame further includes: SR indication information, if the channel evaluation result is that the channel is idle, the node transmitting the message on the channel may include:

If the channel evaluation result is that the channel is idle, and the SR indication information is an allowable indication letter The node transmits a message on the channel.

Optionally, the CCA threshold corresponding to the OBSS includes: the packet detection PD level value corresponding to the OBSS; the CCA threshold corresponding to the BSS where the node is located includes: a PD level value corresponding to the BSS where the node is located.

Alternatively, if the node is a site, and the node in the BSS where the node is located is an AP, the method may further include:

The node determines whether the transmission frame is an uplink transmission frame;

If the transmission frame is an uplink transmission frame, the node determines a CCA threshold corresponding to the OBSS; the CCA threshold corresponding to the OBSS is greater than or equal to a CCA threshold corresponding to the BSS where the node is located;

The node performs channel estimation according to the CCA threshold corresponding to the OBSS.

Specifically, if the transmission frame is an uplink transmission frame, the transmission frame is a non-D2D transmission frame.

For example, the node may determine whether the transmission frame is an uplink transmission frame according to a group identifier (Group ID) in the transmission frame. If the group ID is 0, the node may determine that the transmission frame is an uplink transmission frame; otherwise, if the group ID is 63, it is a downlink frame.

Alternatively, the method may further comprise:

If the node is different from the WLAN standard supported by the associated node in the BSS where the node is located, the node does not need to determine the CCA threshold corresponding to the OBSS, that is, the node cannot perform spatial multiplexing.

For example, if the WLAN standard supported by the node is the 802.11ax standard, the node is an HE site. If the associated node in the BSS where the node is located, such as the WLAN standard supported by the AP, is a non-802.11ax standard, the AP is a non-HE-AP. The HE site supports a different WLAN standard than the non-HE-AP supported WLAN standard, and the HE site cannot be spatially multiplexed.

In the fifth embodiment of the present invention, a plurality of nodes determine whether the transmitting node of the transmission frame and the node are located in the same BSS according to the transmission frame, and provide a plurality of information transmission methods, so as to better ensure that the node is in the received different BSS. The signals are differentiated, so that the channel estimation can be performed by using the corresponding CCA threshold according to the differentiation result, thereby improving the accuracy of channel estimation, improving data transmission efficiency, and improving network throughput.

Embodiment 6 of the present invention further provides a node. FIG. 14 is a schematic structural diagram of a node according to Embodiment 6 of the present invention. As shown in FIG. 14, the node 1400 can include: a receiver 1401. And transmitter 1402. The node 1400 can be the first node in any of the above embodiments.

The receiver 1401 is configured to receive a request message sent by the second node; the first node is located in the same BSS as the second node.

The transmitter 1402 is configured to send a response message to the second node, where the response message includes: an identifier of the BSS where the first node is located.

Optionally, the identifier of the BSS where the first node is located includes a BSS Color; and the identifier of the BSS where the first node is located is in a duration field of the response message.

Optionally, the response message further includes: carrying indication information, where the indication information is used to indicate to the third node that the preset bit in the duration field of the response message has an identifier of the BSS where the first node is located. .

Optionally, the duration corresponding to the duration field of the request message is a first duration; the first duration is a duration, a short inter-frame interval, and a preset response of the second node according to the duration of the response message to be received. The duration determined by the duration of the message transmission; the preset bit of the duration field of the to-be-received response message includes: an identifier of the BSS where the second node is located.

The node 1400 may further include: a processor, configured to determine a second duration according to the first duration, the SIFS, and the preset response message transmission duration; and the duration of the duration field in the response message is the Two hours long.

Optionally, the processor is further configured to determine, according to the preset transmission rate, the preset response message transmission duration.

Optionally, the processor is further configured to configure the preset bit of the duration field of the response message as an identifier of the BSS where the first node is located; and other durations of the response message according to the preset duration The bit is configured such that the duration of the duration field of the response message is greater than or equal to the preset duration.

The node provided in the sixth embodiment of the present invention may perform the information transmission method performed by the first node in any one of the foregoing Embodiments 1 to 5, and the specific implementation process and the beneficial effect. Similar to the above embodiment, it will not be described here.

Embodiment 7 of the present invention further provides a node. FIG. 15 is a schematic structural diagram of a node according to Embodiment 7 of the present invention. As shown in FIG. 15, the node 1500 can include a receiver 1501 and a processor 1502. The node 1500 can be a third node.

The receiver 1501 is configured to listen to a response message sent by the first node to the second node, where the response message includes: an identifier of the BSS where the first node is located; the first node is located in the same BSS as the second node.

The processor 1502 is configured to determine, according to the response message, an identifier of the BSS where the first node is located, and determine whether the first node and the third node are located according to the identifier of the BSS where the first node is located and the identifier of the BSS where the third node is located. Within the same BSS.

Optionally, the processor 1502 is further configured to compare the identifier of the BSS where the first node is located with the identifier of the BSS where the third node is located; if the identifier of the BSS where the first node is located is different from the identifier of the BSS where the third node is located, Then determining that the first node and the third node are located in different BSSs.

Optionally, the identifier of the BSS where the first node is located includes a BSS Color;

The processor 1502 is further configured to determine an identifier of the BSS where the first node is located according to the duration field of the response message.

Optionally, the processor 1502 is further configured to determine, according to the preset bit in the duration field of the response message, an identifier of the BSS where the first node is located.

Optionally, the response message further includes: carrying indication information;

The processor 1502 is further configured to: determine, according to the carrying indication information, whether the preset bit in the duration field of the response message has an identifier of a BSS where the first node is located; if the preset bit exists in the first node The identifier of the BSS is determined by the preset bit in the duration field of the response message.

Optionally, the processor 1502 is further configured to determine, according to a comparison result of the duration of the duration field of the response message, and the preset threshold, whether the preset bit in the duration field of the response message exists. The identifier of the BSS where the first node is located; if the preset bit has the identifier of the BSS where the first node is located, determining the identifier of the BSS where the first node is located according to the preset bit in the duration field of the response message .

The node provided in Embodiment 6 of the present invention can perform any one of Embodiments 1 to 5 above. The specific implementation process and the beneficial effects of the information transmission method performed by the third node in the embodiment are similar to those in the foregoing embodiment, and details are not described herein again.

One of ordinary skill in the art will appreciate that all or part of the steps to implement the various method embodiments described above may be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

An information transmission method, comprising:

The first node receives the request message sent by the second node; the first node and the second node are located in the same basic service set BSS;

The first node sends a response message to the second node, where the response message includes: an identifier of the BSS where the first node is located.
The method according to claim 1, wherein the identifier of the BSS where the first node is located includes a BSS Color; and the identifier of the BSS where the first node is located is located in a duration field of the response message.
The method according to claim 2, wherein the identifier of the BSS where the first node is located is located at a preset bit in the duration field of the response message.
The method according to claim 3, wherein the response message further comprises: carrying indication information;

The carrying indication information is used to indicate to the third node that the preset bit in the duration field of the response message has an identifier of a BSS where the first node is located.
The method according to claim 3, wherein the comparison between the duration of the duration field of the response message and the preset threshold is used to indicate to the third node the duration of the response message. The preset bit in the domain has an identifier of the BSS where the first node is located.
The method according to any one of claims 3-5, wherein the duration of the duration field of the request message is a first duration; the first duration is the response of the second node according to the to-be-received The duration determined by the duration of the message, the inter-frame interval SIFS, and the duration of the preset response message transmission duration; the preset bit of the duration field of the to-be-received response message includes: the second node The identity of the BSS where it is located;

Before the first node sends a response message to the second node, the method further includes:

The first node determines a second duration according to the first duration, the SIFS, and the preset response message transmission duration; and the duration corresponding to the duration field in the response message is the second duration.
The method of claim 6 wherein said first node is in accordance with said Before the first duration, the SIFS, and the preset response message transmission duration determine the second duration, the method further includes:

The first node determines the duration of the preset response message transmission according to a preset transmission rate.
The method according to claim 7, wherein the preset transmission rate is a primary rate of the first node, a rate corresponding to a modulation and coding strategy MCS of the first node, and a second node Any of the rates corresponding to the MCS; the MCS of the second node may be determined by the first node according to the request message.
The method according to any one of claims 3-5, wherein before the first node sends a response message to the second node, the method further includes:

The first node configures the preset bit of the duration field of the response message as an identifier of a BSS where the first node is located;

The first node configures other bits of the duration field of the response message according to the preset duration, such that the duration corresponding to the duration field of the response message is greater than or equal to the preset duration.
An information transmission method, comprising:

The third node listens to the response message sent by the first node to the second node, where the response message includes: an identifier of the basic service set BSS where the first node is located; the first node and the second node are located in the same BSS ;

Determining, by the third node, an identifier of the BSS where the first node is located according to the response message;

The third node determines, according to the identifier of the BSS where the first node is located and the identifier of the BSS where the third node is located, whether the first node and the third node are located in the same BSS.
The method according to claim 10, wherein the third node determines the first node and the third node according to an identifier of a BSS where the first node is located and an identifier of a BSS where the third node is located. Whether it is located in the same BSS, including:

The third node compares the identifier of the BSS where the first node is located and the identifier of the BSS where the third node is located;

If the identifier of the BSS where the first node is located is different from the identifier of the BSS where the third node is located, the third node determines that the first node and the third node are located in different BSSs.
The method according to claim 10 or 11, wherein the identifier of the BSS where the first node is located includes a BSS Color;

Determining, by the third node, the identifier of the BSS where the first node is located according to the response message, including:

The third node determines an identifier of the BSS where the first node is located according to a duration field of the response message.
The method according to claim 12, wherein the determining, by the third node, the identifier of the BSS where the first node is located according to the duration field of the response message comprises:

The third node determines an identifier of the BSS where the first node is located according to a preset bit in the duration field of the response message.
The method according to claim 13, wherein the response message further comprises: carrying indication information;

Determining, by the third node, the identifier of the BSS where the first node is located according to the preset bit in the duration field of the response message, including:

Determining, by the third node, whether the preset bit in the duration field of the response message has an identifier of a BSS where the first node is located, according to the carrying indication information;

If the preset bit has an identifier of the BSS where the first node is located, the third node determines, according to the preset bit in the duration field of the response message, the BSS of the first node. Logo.
The method according to claim 13, wherein the determining, by the third node, the identifier of the BSS where the first node is located according to the preset bit in the duration field of the response message comprises:

Determining, by the third node, whether the preset bit in the duration field of the response message exists, according to a comparison result of a duration of the duration field of the response message and a preset threshold The identifier of the BSS where the node is located;

If the preset bit has an identifier of the BSS where the first node is located, the third node determines, according to the preset bit in the duration field of the response message, the BSS of the first node. Logo.
The method according to any one of claims 13 to 15, wherein the duration of the duration of the response message corresponds to a second duration; the second duration is the first The node is determined according to the first duration, the short inter-frame interval SIFS, and the preset transmission duration;

The first duration is a duration corresponding to the duration field in the request message sent by the second node to the first node; the first duration is the duration of the second node according to the duration of the response message to be received. The duration determined by the SIFS and the preset transmission duration; the preset bit of the duration field of the to-be-received response message includes: an identifier of the BSS where the second node is located.
The method according to claim 16, wherein the preset transmission duration is determined by the first node according to a preset transmission rate; the preset transmission rate is a primary rate of the first node, The rate at which the modulation of the first node corresponds to the coding strategy MCS and the rate corresponding to the MCS of the second node; the MCS of the second node may be determined for the request message.
The method according to any one of claims 13 to 15, wherein the duration of the duration field of the response message is that the first node configures the preset bit as the first node. The identifier of the BSS, where the other bits of the duration field of the response message are configured according to the preset duration, is greater than or equal to the duration of the preset duration.
The method according to any one of claims 10 to 18, wherein the method further comprises:

If the first node and the third node are located in different BSSs, the third node determines an idle channel assessment CCA threshold corresponding to the overlapping basic service set OBSS; the CCA threshold corresponding to the OBSS is greater than or equal to the The CCA threshold corresponding to the BSS where the third node is located;

The third node performs channel estimation according to a CCA threshold corresponding to the OBSS;

If the channel evaluation result is that the channel is idle, the third node transmits a message on the channel.
The method according to claim 19, wherein the response message further comprises: spatial multiplexing SR indication information;

If the channel evaluation result is that the channel is idle, the transmitting, by the third node, the message on the channel includes:

If the channel evaluation result is that the channel is idle, and the SR indication information is permission indication information, the third node transmits a message on the channel.
A node, the node being a first node, comprising: a receiver And transmitter;

The receiver is configured to receive a request message sent by a second node; the first node and the second node are located in a same basic service set BSS;

The transmitter is configured to send a response message to the second node, where the response message includes: an identifier of a BSS where the first node is located.
The node according to claim 21, wherein the identifier of the BSS where the first node is located includes a BSS Color; and the identifier of the BSS where the first node is located is located in a duration field of the response message.
The node according to claim 22, wherein the identifier of the BSS where the first node is located is located at a preset bit in the duration field of the response message.
The node according to claim 23, wherein the response message further comprises: carrying indication information; the carrying indication information, configured to indicate to the third node, in a duration field of the response message The preset bit exists in the identifier of the BSS where the first node is located.
The node according to claim 23, wherein the comparison between the duration of the duration field of the response message and the preset threshold is used to indicate to the third node the duration of the response message. The preset bit in the domain has an identifier of the BSS where the first node is located.
The node according to any one of claims 23-25, wherein the duration of the duration field of the request message is a first duration; the first duration is the response of the second node according to the to-be-received The duration determined by the duration of the message, the inter-frame interval SIFS, and the duration of the preset response message transmission duration; the preset bit of the duration field of the to-be-received response message includes: the second node The identity of the BSS where it is located;

The node further includes: a processor;

The processor is configured to determine a second duration according to the first duration, the SIFS, and the preset response message transmission duration; and the duration corresponding to the duration field in the response message is the second duration.
The node according to claim 26, wherein the processor is further configured to determine the preset response message transmission duration according to a preset transmission rate.
A node according to any of claims 23-25, wherein the node Points also include: a processor;

The processor is configured to configure the preset bit of the duration field of the response message as an identifier of a BSS where the first node is located; and other durations of the response message according to a preset duration The bit is configured such that the duration of the duration field of the response message is greater than or equal to the preset duration.
A node, the node being a third node, comprising: a receiver and a processor;

The receiver is configured to listen to a response message sent by the first node to the second node, where the response message includes: an identifier of a basic service set BSS where the first node is located; the first node and the second node Located in the same BSS;

The processor is configured to determine, according to the response message, an identifier of a BSS where the first node is located; determine the first node according to an identifier of a BSS where the first node is located and an identifier of a BSS where the third node is located Whether the third node is located in the same BSS.
The node according to claim 29, wherein the processor is further configured to compare an identifier of a BSS where the first node is located with an identifier of a BSS where the third node is located; if the BSS of the first node is located The identifier of the BSS is different from the identifier of the BSS where the third node is located, and then determining that the first node and the third node are located in different BSSs.
The node according to claim 29 or 30, wherein the identifier of the BSS where the first node is located includes a BSS Color, and the processor is further configured to determine the number according to a duration field of the response message. The identifier of the BSS where a node is located.
A node according to claim 31, wherein

The processor is further configured to determine, according to a preset bit in the duration field of the response message, an identifier of a BSS where the first node is located.
The node according to claim 32, wherein the response message further comprises: carrying indication information;

The processor is further configured to determine, according to the carrying indication information, whether the preset bit in the duration field of the response message has an identifier of a BSS where the first node is located; if the preset bit The identifier of the BSS where the first node is located is determined, and the identifier of the BSS where the first node is located is determined according to the preset bit in the duration field of the response message.
The node of claim 32, wherein:

The processor is further configured to determine whether the preset bit in the duration field of the response message exists according to a comparison between a duration corresponding to the duration field of the response message and a preset threshold. Determining the identifier of the BSS where the first node is located; if the preset bit has the identifier of the BSS where the first node is located, determining the number according to the preset bit in the duration field of the response message The identifier of the BSS where a node is located.