WO2018058843A1

WO2018058843A1 - Message transmission method and device

Info

Publication number: WO2018058843A1
Application number: PCT/CN2016/113945
Authority: WO
Inventors: 韩云博; 丁志明
Original assignee: 华为技术有限公司
Priority date: 2016-09-30
Filing date: 2016-12-30
Publication date: 2018-04-05
Also published as: CN109417776B; CN109417776A

Abstract

A message transmission method and device, relating to the field of wireless communication technologies, and used for reducing the problem of interference between devices when using existing technology for spatial multiplexing. The method comprises: a first device listening to a first message in a channel monitoring process; after determining that the first message comprises indication information, determining that a first frame header is not heard in the channel monitoring process according to indication information, and determining that a channel is idle during a first duration and performing spatial multiplexing. Therefore, compared to existing technology, interference between devices during spatial multiplexing is reduced.

Description

Method and device for transmitting messages

The present application claims the priority of the Chinese Patent Application, which is filed on Sep. 30, 2016, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present application relates to the field of wireless communications technologies, and in particular, to a method and device for transmitting a message.

Background technique

At present, a WLAN (Wireless Local Area Network) system includes not only a legacy device but also a narrowband device based on an Internet of Thing (IoT) scenario, and a compatible device, wherein the legacy device is in communication. The message transmitted when the message is a broadband message, the message transmitted by the narrowband device during the communication is a narrowband message, the channel bandwidth occupied by the broadband message is greater than the channel bandwidth occupied by the narrowband message, and the message transmitted by the compatible device during communication may include the wideband frame. The header and narrowband data, in addition, the messages transmitted by the compatible device during communication may also be broadband messages or narrowband messages.

As shown in FIG. 1 , the first device 1 and the first device 2 are respectively narrowband devices, and the second device 3 and the second device 4 are respectively compatible devices, and the first device 1 and the first device 2 are in the same manner. In the first BSS (Basic Service Set), the second device 3 and the second device 4 are in the second BSS, wherein the first BSS and the second BSS are OBSS (Overlapping Basic Service Set). And the second device 3 and the second device 4 are occupying the channel transmission message, and the message transmitted between the second device 3 and the second device 4 is a message having a wideband header and narrowband data, and the first device 1 is at the signal Outside the coverage area 110 and within the signal coverage area 100, assuming that the second device 3 sends a message to the second device 4, the signal coverage range 100 is the signal coverage range when the second device 3 transmits the wideband frame header, and the signal coverage range is 110. Signal coverage when transmitting the narrowband data for the second device 3, when the first device 1 needs to send a narrowband message to the first device 2, Since the first device 1 is in the signal coverage area 110, when the narrowband data is transmitted between the second device 3 and the second device 4, the channel is considered to be in a busy state, and communication cannot be performed by spatial multiplexing, but when the second device 3 When the broadband frame header is transmitted between the second device 4 and the first device 1 is outside the signal coverage range 110, the channel is considered to be in an idle state, and communication can be performed by spatial multiplexing.

In order to enable the first device 1 to transmit narrowband data between the second device 3 and the second device 4, the channel is considered to be in an idle state, so that the first device 1 sends a message to the first device 2, and the technology used in the prior art is adopted. The method is to increase the CCA (Clear Channel Assessment) decision threshold of the first device 1.

However, although this technical means improves the throughput of the WLAN system, the communication between the devices is increased to some extent when communicating through spatial multiplexing.

Summary of the invention

The present application provides a method and a device for transmitting a message to reduce the problem of interference between devices when spatial multiplexing is performed by using the prior art.

In a first aspect, a method of transmitting a message is provided, including:

The first device detects the first message during the channel monitoring process, and after determining that the first message includes the indication information, determining, according to the indication information, that the first frame header is not detected during the channel monitoring process, determining that the first frame header is first The channel is idle in the duration and spatially multiplexed. The first message is that the second device is transmitted by using the first power, the first device is the device in the first BSS, and the second device is the device in the second BSS, and the first BSS and the second BSS are OBSS, indicating The information is used to indicate that the second device sends the first frame header before transmitting the first message, and that the transmit power of the at least one second message is the second power, and the second message is the second device after transmitting the first message. The message transmitted by the channel is occupied by the first time frame, the channel bandwidth occupied by the first frame header is larger than the channel bandwidth occupied by the first message, and the first frame header is used to indicate that the channel is busy during the second time period to avoid the third The device occupies the channel in the second time period, where the second device is the length of time required for the first device to complete the first frame header to complete the transmission of the first message, and the third device needs to transmit the channel and the first frame header. a device that uses the same message with the same channel bandwidth, and the second device uses the second power to transmit the first message. The signal coverage is not greater than the signal coverage when the second device transmits the first frame header using the first power.

Since the second message is sent by the second power in the first time period, and the second device uses the second power to transmit the first message, the signal coverage is not greater than when the second device uses the first power to transmit the first frame header. Signal coverage, because the first message is a narrowband message in the embodiment of the present application, whether the second message is a broadband message or a narrowband message, the signal coverage is not greater than the first power transmission when the second power is transmitted. The signal coverage at the time of the frame header, and the manner of realizing spatial multiplexing by reducing the transmission power is compared with the prior art by increasing the CCA (Clear Channel Assessment) decision threshold to achieve spatial multiplexing. The interference of the second device to the first device when spatial multiplexing is performed is reduced.

Based on the first aspect, in a possible implementation, the first device determines that the transmit power of the third message is the third power, and transmits the third message by using the third power within the first duration. The signal coverage range when the first device uses the third power to transmit the third message is not greater than the signal coverage range when the second device uses the first power to transmit the first frame header.

Since the first device uses the third power to transmit the third message, and the first device uses the third power to transmit the third message, the signal coverage is not greater than the signal coverage when the second device uses the first power to transmit the first frame header. Therefore, when the second device transmits the second message by using the second power, mutual interference between the first device and the second device when spatial multiplexing is performed is avoided.

Based on the first aspect, in a possible implementation, the indication information includes a first sub-instruction information and a second sub-instruction information, where the first sub-instruction information is used to indicate that the second device sends the first information before transmitting the first message. The frame header, the second sub-instruction information is used to indicate that the transmit power of the at least one second message is the second power.

Based on the first aspect, in another possible implementation manner, if the first device detects a noise signal that lasts for a third duration before detecting the first message, determining, after detecting the first message, determining The channel is busy.

Since the first device detects the noise signal of the third duration before the first message is heard, it is possible that the first device does not recognize the broadband message. Therefore, in this case, the first device is in the first frame header. Signal coverage, so it is determined that the channel is busy, avoiding the first setting A message is sent to interfere with the device that is occupying channel communication.

Based on the first aspect, in a possible implementation, before determining that the channel is in a busy state, the first device determines that the signal energy of the detected noise signal is greater than a preset signal energy threshold.

By determining the noise signal energy and the preset signal energy threshold, the first device can further determine whether the first device is sent in the vicinity of the signal coverage range when the first frame header is transmitted, or the edge position. A message that interferes with a device that is occupying channel communication.

It should be noted that the preset signal energy threshold is set based on actual conditions.

Based on the first aspect, in another possible implementation manner, before detecting the first message, the first device detects a noise signal that lasts for a third time period, and the signal energy of the detected noise signal is not greater than A preset signal energy threshold and determining that the channel is idle during the first time period.

By determining the noise signal energy and the preset signal energy threshold, the first device can further determine whether the first device is sent in the vicinity of the signal coverage range when the first frame header is transmitted, or the edge position. The message, when the signal energy of the heard noise signal is not greater than the preset signal energy threshold, indicating that the first device is positioned closer to the edge within the signal coverage range when the first frame header is transmitted, in this case, although The first device in the process of communicating through spatial multiplexing may cause interference to other devices in the process of communicating through spatial multiplexing, but since the interference is small, the impact on the normal transmission of the message is not large, so when When the signal energy of the detected noise signal is not greater than the preset signal energy threshold, it is determined that the channel is in an idle state during the first time period for spatial multiplexing, thereby improving the utilization of channel resources.

Based on the first aspect, when the first device is a compatible device, in a possible implementation manner, the first device detects the first frame header and the first message during the channel monitoring process, and determines that the channel is in a busy state.

In a second aspect, a method of transmitting a message is provided, including:

The second device generates a first message and transmits the first message by the first power.

The first message includes indication information, where the indication information is used to indicate that the second device sends the first frame header before transmitting the first message, and that the transmit power of the at least one second message is the second The second message is that the second device occupies the message transmitted by the channel in the first time period after the first message is sent, and the channel bandwidth occupied by the first frame header is greater than the channel bandwidth occupied by the first message, and the second duration is The third device is a device that needs to transmit a message with the same channel bandwidth occupied by the first frame header through the channel, and the second device adopts a time period from when the first frame header is sent to when the first message is sent. The coverage of the signal when the first power is transmitted by the second power is not greater than the coverage of the signal when the first device transmits the first frame header by using the first power. It should be noted that one frame is composed of the first message and the first frame header, and the first message and the first frame header are both transmitted by the first power.

Since the first message is transmitted with a larger first power, the channel resource may be preempted for the transmission of the second message in the first duration; and the first message includes indication information, so that when the first device communicates through spatial multiplexing , reducing the interference of the second device to the first device.

Based on the second aspect, in a possible implementation manner, after transmitting the first message by the first power, the second device transmits the at least one second message by using the second power within the first duration; or, within the first duration Receiving at least one second message transmitted by the second power.

It should be noted that the second message may further carry a message indicating that the transmit power of the second message is the second power.

Based on the second aspect, in another possible implementation manner, the indication information includes a first sub-instruction information and a second sub-instruction information, where the first sub-instruction information is used to indicate that the second device sends the first message before transmitting the first message. a frame header, the second sub-instruction information is used to indicate that the transmit power of the at least one second message is the second power.

In a third aspect, a first device is provided, including: a transceiver and a processor, wherein the transceiver is configured to listen to a first message during channel monitoring, and the processor is configured to determine the first message After the indication information is included, according to the indication information, it is determined that the first frame header is not detected during the channel monitoring process, and it is determined that the channel is in an idle state during the first time period for spatial multiplexing. The first message is that the second device is transmitted by using the first power, the first device is the device in the first BSS, and the second device is the device in the second BSS, and the first BSS and the second BSS are OBSS, indicating The information is used to indicate that the second device sends the first frame header before transmitting the first message, and that the transmit power of the at least one second message is the second power, and the second message is the second device after transmitting the first message. One The time frame occupies the message transmitted by the channel, the channel bandwidth occupied by the first frame header is larger than the channel bandwidth occupied by the first message, and the first frame header is used to indicate that the channel is busy during the second time period to avoid the third device. The channel is occupied in the second time period, and the second time is the length of time required for the first device to complete the first message from the first frame to the completion of the first message, and the third device needs to transmit through the channel and the first frame header. The device that occupies the same message with the same channel bandwidth, the coverage of the signal when the second device transmits the first message by using the second power is not greater than the coverage of the signal when the second device transmits the first frame header by using the first power;

Based on the third aspect, in a possible implementation, the processor is further configured to: determine that the transmit power of the third message is the third power, where the first device uses the third power to transmit the third message. The signal coverage is not greater than the second device transmitting the first frame header by using the first power; the transceiver is further configured to transmit the third message by using the third power in the first duration.

Based on the third aspect, in another possible implementation manner, the indication information includes a first sub-instruction information and a second sub-instruction information, where the first sub-instruction information is used to indicate that the second device transmits the first message before transmitting the first message. a frame header, the second sub-instruction information is used to indicate that the transmit power of the at least one second message is the second power.

Based on the third aspect, in a possible implementation manner, if the transceiver detects a noise signal that lasts for a third time before the first message is heard, after the first message is detected, the processor determines The channel is busy.

Based on the third aspect, in a possible implementation manner, after determining that the signal energy of the detected noise signal is greater than a preset signal energy threshold, the processor determines that the channel is in a busy state.

Based on the third aspect, in a possible implementation manner, after the transceiver detects the noise signal for the third duration before the transceiver detects the first message, the processor determines the signal energy of the detected noise signal. Not greater than the preset signal energy threshold, determining that the channel is idle during the first time period

Based on the third aspect, in another possible implementation manner, after the transceiver detects the first frame header and the first message in the channel monitoring process, the processor determines that the channel is in a busy state.

In a fourth aspect, a second device is provided, including: a processor and a transceiver, wherein The device is configured to generate a first message, and the transceiver is configured to transmit the first message by using the first power.

The first message includes indication information, where the indication information is used to indicate that the second device sends the first frame header before transmitting the first message, and that the transmit power of the at least one second message is the second power, and the second message is The second device occupies the message transmitted by the channel in the first time period after the first message is sent, the channel bandwidth occupied by the first frame header is greater than the channel bandwidth occupied by the first message, and the second time period is that the first device sends the message from the completion. The first frame is up to the time required to complete the sending of the first message, and the third device is a device that needs to transmit a message with the same channel bandwidth occupied by the first frame header through the channel, and the second device transmits the first message by using the second power. The signal coverage of the time is not greater than the signal coverage when the second device transmits the first frame header with the first power.

Based on the fourth aspect, in a possible implementation manner, the transceiver transmits the at least one second message by using the second power in the first time period after the first message is sent by using the first power; or

The transceiver receives the at least one second message transmitted by the second power for a first time period after transmitting the first message by the first power.

Based on the fourth aspect, in another possible implementation manner, the indication information includes a first sub-instruction information and a second sub-instruction information, where the first sub-instruction information is used to indicate that the second device transmits the first message before transmitting the first message. a frame header, the second sub-instruction information is used to indicate that the transmit power of the at least one second message is the second power.

DRAWINGS

FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present application;

2 is a schematic diagram of signal coverage of an embodiment of the present application;

3 is a schematic diagram of a frequency band of a message occupation channel according to an embodiment of the present application;

4 is a schematic structural diagram of a frame format of a message according to an embodiment of the present application;

FIG. 5 is a schematic flowchart of a method for transmitting a message according to an embodiment of the present application;

6 is a schematic structural diagram of a frame format of a message according to an embodiment of the present application;

7a and 7b are schematic diagrams of locations in the narrowband data carrying indication information in the embodiment of the present application;

FIG. 8 is a schematic diagram of a location of carrying the indication information in the narrowband data according to the embodiment of the present application;

FIG. 9 is a schematic flowchart of a method for transmitting a message according to an embodiment of the present application;

10a and 10b are schematic diagrams of signal coverage of an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a first device according to an embodiment of the present application;

FIG. 12 is a schematic structural diagram of a second device according to an embodiment of the present application.

detailed description

In order to make the objects, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

It should be understood that the narrowband device and the compatible device in the embodiment of the present application may be an STA (Station) or an Access Point (AP).

At present, since the IoT application-based device is introduced into the WLAN system, the messages transmitted by the devices that are mainly based on the IoT application are narrow-band messages. (In the present application, only the transmission is supported in the communication. The device of the narrowband message is hereinafter referred to as a narrowband device. The message transmitted by the legacy device in the WLAN system is a broadband message. Specifically, the channel bandwidth occupied by the narrowband message is smaller than the channel bandwidth occupied by the broadband message. In the prior art, whether the legacy device or the narrowband device uses the maximum transmit power when transmitting the message, when the legacy device sends the broadband message and the narrowband device transmits the narrowband message using the same maximum power, since the narrowband message is compared with the wideband message. The occupied channel bandwidth is small, so under the same transmission power, the signal coverage of the narrowband message is larger than the signal coverage of the wideband message. As shown in FIG. 2, when the device 200 and the device 210 are both broadband devices, when the device 200 and the device 210 are in communication, the signal coverage is 220; when the device 200 and the device 210 are both narrowband devices, the device 200 When communicating with device 210, the signal coverage is 230.

However, since the energy of the narrowband message is concentrated in a narrow frequency band in the channel, when the narrowband device 1 and the narrowband device 2 are occupying the channel to transmit the narrowband message, the BSS in which the narrowband device 1 and the narrowband device 2 are located are mutually OBSS BSS. The broadband device 1 needs to send a broadband message to the broadband device 2, and the broadband device 1 performs channel monitoring. Since the broadband device 1 cannot recognize the narrowband message, the broadband device 1 can only judge whether to transmit the broadband by listening to the signal energy in the channel. Signal due to letter In the channel, the signal energy is only large in a narrow frequency band, and the broadband device 1 needs to transmit a wideband message on a wider frequency band in the channel, as shown in FIG. 3, if the narrowband device 1 and the narrowband device 2 are transmitting. The frequency band in the channel occupied by the narrowband message is 310. When there is no transmission message in the frequency band 320 and the frequency band 330 in the channel, and the bandwidth of the channel that the broadband device 1 needs to occupy is the bandwidth indicated by the frequency band 300, when the broadband device 1 During the channel monitoring process, the signal energy obtained by averaging the signal energy in the frequency band 310 to the frequency band 330 is used as the sound of the sounding signal, and then the broadband device 1 improves the sounding based on the signal energy when performing the CCA decision. The signal energy is less than the CCA decision threshold, causing the broadband device 1 to consider the current channel to be in an idle state and then transmitting a wideband message on the channel, which can cause interference to devices in the channel that are transmitting narrowband messages.

To solve this problem, compatible devices have been introduced, in which compatible devices can support communication of broadband messages as well as narrowband messages, and support communication of messages including wideband headers and narrowband data. The frame format of the message including the broadband frame header and the narrowband data is as shown in FIG. 4 . Specifically, the interval between the wideband frame header and the narrowband data is t ₀ , where t ₀ may be 0 or may be greater than 0. Value, such as 4us, 8us, 16us or 36us. Since a wideband frame header is transmitted before the narrowband data is transmitted, the legacy device can recognize the wideband frame header after listening to the wideband frame header in the channel, so that the channel can be confirmed based on the information carried in the wideband frame header. The duration T that needs to be occupied attempts to access the channel after the elapsed time T, thus reducing the interference of other legacy devices on the device transmitting the narrowband message during communication.

However, when the compatible device 1 and the compatible device 2 are transmitting the message as shown in FIG. 4, it is assumed that the BSS in which the compatible device 1 and the compatible device 2 are located is the first BSS, and the BSS in which the narrowband device 1 and the narrowband device 2 are located is the second. BSS, and the first BSS and the second BSS are OBSSs of each other, and the narrowband device 1 is located in the signal coverage area 1 and is outside the signal coverage range 2, wherein the signal coverage range 1 is the transmission of narrowband data between the compatible device 1 and the compatible device 2 Signal coverage range, signal coverage 2 is the signal coverage range when the broadband frame header is transmitted between the compatible device 1 and the compatible device 2, and if the narrowband device 1 needs to send a narrowband message to the narrowband device 2, channel monitoring is performed on the channel. During the monitoring process, when the broadband frame header is transmitted between the compatible device 1 and the compatible device 2, the channel is considered to be in an idle state, and the narrowband device 1 can perform spatial multiplexing and transmit a narrowband message, when the compatible device 1 and the compatible device 2 When narrowband data is transmitted between, the channel is considered to be busy and cannot be spatially multiplexed.

In order to enable the narrowband device 1 to transmit narrowband data between the compatible device 1 and the compatible device 2, the channel is considered to be in an idle state, so that the narrowband device 1 transmits the narrowband message to the narrowband device 2, and the technical means adopted in the prior art is to improve the The CCA (Clear Channel Assessment) threshold of a device 1 determines the throughput of the WLAN system, but it increases the interference between the devices during communication.

Taking the scenario shown in FIG. 1 as an example, when the second device 3 and the second device 4 are both compatible devices, the first device 1 and the first device 2 are both narrowband devices, and the first device 1 and the first device 2 are located. When the BSS and the BSS where the second device 3 and the second device 4 are located are OBSS, the second device 3 and the second device 4 need to establish communication, and one of the second device 3 and the second device 4 needs to be generated. The first message including the indication information is used to enable simultaneous communication between the first device 1 and the first device 2 and the second device 3 and the second device 4.

It should be noted that the first device 1 and the first device 2 may also be compatible devices, or one of them is a compatible device, and the other is a narrowband device.

For example, as shown in FIG. 5, the method for transmitting a message in the embodiment of the present application includes:

Step 500: The second device 3 generates a first message, where the first message includes indication information, where the indication information is used to indicate that the second device 3 transmits the first frame header before transmitting the first message, and indicates at least one second message. Transmit power, the second message is that the second device 3 occupies the message transmitted by the channel within the first time period after the first message is sent, the channel bandwidth occupied by the first frame header is greater than the channel bandwidth occupied by the first message, and The first frame header may be used to indicate that the channel in the second time period will be in a busy state to prevent the third device from occupying the channel in the second time period, and the third device is a channel that needs to be transmitted through the channel and occupied by the first frame header. The device of the same bandwidth message, the second duration is the length of time required for the second device 3 to complete the transmission of the first frame header to complete the transmission of the first message, and the signal coverage of the second device 3 when the first message is transmitted by using the second power It is not greater than the signal coverage range when the second device 3 transmits the first frame header with the first power.

Specifically, the first frame header is a broadband frame header, and the third device is a legacy device, and the first message is as follows. The narrowband data shown in Figure 4.

The frame consisting of the first frame header and the first message may be a data frame, a control frame, or a management (in the embodiment of the present application). When the frame is a control frame, the frame may be an RTS (Request To Send) type frame or a CTS (Clear To Send) type frame. In addition, when the RTS (Request To Send) type frame is sent by the second device 3, after receiving the RTS (Request To Send) type frame, the second device 4 needs to use the maximum transmit power. The second device 3 transmits a CTS type frame.

It should be understood that the narrowband data shown in FIG. 4 may include a narrowband header and a narrowband payload, as shown in FIG. The indication information may be added to the narrowband frame header, or the indication information may be added to the narrowband payload. In a specific implementation, the indication information may be carried by one bit, or may be carried by two bits respectively. For example, when the indication information is carried by one bit, when the bit is 1, the indication information is included in the narrowband data, and when the bit is 0, the indication information is not included in the narrowband data. When the information is carried by two bits, the indication information includes a first sub-instruction information and a second sub-instruction information, where the first sub-instruction information is used to indicate that the second device transmits the first frame header, the second sub- The indication information is used to indicate that the transmit power of the at least one second message is the second power, wherein the first sub-instruction information is carried by one of the bits, and the second sub-instruction information is carried by another bit, and the bit of the first sub-instruction information is assumed When the bit is 1, it indicates that the first sub-instruction information is included in the narrowband data, and when the bit of the second sub-instruction information is 1, it indicates that the second sub-instruction information is included in the narrowband data, so in this case, when When the bit of the first sub-indication information and the bit of the second sub-instruction information are both 1, it indicates that the indication information is included in the narrowband data.

It should be understood that when the frame consisting of the first frame header and the first message is an RTS type frame or a CTS type frame, the indication may be carried by a Frame control field in a MAC (Media Access Control) header in the narrowband data. The information, or the indication information carried by the Frame control extension field in the narrowband data, needs to be described. When the indication information is carried in the Frame control field in the MAC header, in the specific implementation, the subdomain subtype in the Frame control domain may be used. Carry instructions.

It should be noted that, as shown in FIG. 1 , one of the second device 3 and the second device 4 may be a compatible device, and the other device may be a narrowband device or a compatible device. When the device is compatible, the first message is generated by a compatible device.

In the embodiment of the present application, the second message may be a message as shown in FIG. 4, or may be a narrowband message. The second message may be transmitted by the second device 3 or may be transmitted by the second device 4, which is not limited herein.

In step 510, the second device 3 transmits the first message by using the first power.

It should be understood that the first message and the first frame header transmit power are both the first power, and the maximum value of the second device 3 transmit power is generally used as the first power, so that the second device 3 can pass the first frame header and The first message is a channel occupied by at least one second message that needs to be transmitted later.

Then, the second device 3 transmits at least one second message by the second power within the first duration, or the second device 3 receives the transmission of the at least one second message by the second power within the first duration.

In a specific implementation, the second message may further include information indicating that the transmit power used to transmit the second message is the second power. If the frame format of the second message is as shown in FIG. 6, the indication sends the second message. The information that the transmit power is the second power may be carried in the narrowband frame header, and may be carried in the narrowband payload. The information in the narrowband frame header including the transmit power used to transmit the second message is the second power. For example, as shown in FIG. 8, the bit that is 1 in the narrowband frame header carries information indicating that the transmit power used to transmit the second message is the second power. When the bit is 1, the second transmission is indicated. The transmit power used by the message is the second power. When the bit is 0, it indicates that the transmit power used to transmit the second message is other power.

Therefore, when the first device 1 is transmitting the frame consisting of the first frame header and the first message in the second device 3 and the second device 4, it is necessary to send a message to the first device 2, in order to achieve spatial multiplexing, In the embodiment of the present application, as shown in FIG. 9, a method for transmitting a message includes:

In step 900, the first device 1 detects the first message during the channel detection process.

Step 910: The first device 1 determines that the indication information is included in the first message.

It should be noted that, when the indication information includes the first sub-instruction information and the second sub-instruction information, the first device 1 determines that the first sub-instruction information and the second sub-instruction information are included in the first message.

Step 920: The first device 1 determines, according to the indication information, that the first frame header is not detected during the channel monitoring process, and determines that the channel is in an idle state during the first time period, and performs spatial multiplexing.

It should be understood that the first device 1 may send the third message by using any power. When the transmission power used by the first device 1 is large, it may be that the second device 3 is in the first device 1 as shown in FIG. 10a. The signal of the third message sent is within the coverage area 310. Although the second device 3 reduces the transmission power such that the first device 1 is outside the signal coverage range 300, since the second device 3 is within the signal coverage area 310, the first device When the third message is transmitted between the second device 3 and the second device 4, the first device 1 may cause interference to the second device 3, but is relatively existing. Technically, the interference of the second device 3 and the second device 4 that are transmitting messages at low power (e.g., the second power) to the first device 1 is reduced.

It should be noted that the signal coverage range 300 in FIG. 10a is a signal coverage range in which the second device 3 transmits the first message by using the second power, and the signal coverage range 110 is that the second device 3 transmits the first frame header by using the first power. Signal coverage at the time.

In order to reduce the interference of the first device 1 to other devices, in the embodiment of the present application, the first device 1 determines that the transmit power of the third message is the third power, where the first device 1 uses the third power to transmit the third message. The signal coverage is not greater than the signal coverage when the second device 3 transmits the first frame header using the first power; then the first device 1 transmits the third message through the third power for the first duration.

Therefore, as shown in FIG. 10b, when the first device 1 transmits the third message by using the third power, both the second device 3 and the second device 4 are located outside the signal coverage area 310, and both the first device 1 and the first device 2 are Located outside the signal coverage area 300, mutual interference between different devices communicating through spatial multiplexing is avoided.

In another embodiment, since the first device 1 cannot identify the first probe when the first device 1 is a narrowband device, the first device 1 detects a noise signal that lasts for a third time before the first message is heard. After the first message is heard, it is determined that the channel is busy.

The third duration is not greater than the length of time required to transmit the first frame header.

Since the first device 1 is capable of detecting a noise signal when the first device 1 is a narrowband device, that is, the first device 1 is within the coverage of the signal of the first frame header transmitted by the second device 3, in this case, The channel is in a busy state and does not perform spatial multiplexing, thereby avoiding mutual interference between devices caused by spatial multiplexing.

Specifically, after the first device 1 detects the noise signal, if the signal energy of the detected noise signal is greater than the preset signal energy threshold, the first device 1 determines that the channel is in a busy state and does not perform spatial multiplexing.

In the embodiment of the present application, in order to achieve spatial multiplexing to a greater extent, although the signal energy of the detected noise signal is not greater than the preset signal energy threshold after the first device 1 detects the noise signal, Determining that the channel is in an idle state, and performing spatial multiplexing. Since the signal energy of the noise signal detected by the first device 1 is not greater than a preset signal energy threshold, the first device 1 is covered by the signal at the first frame header. The edge of the range, although the first device 1 can detect the noise signal, but the signal energy is small, the first device 1 can perform spatial multiplexing.

In addition, when the first device 1 is a compatible device, the first device 1 determines that the channel is in a busy state if the first frame header and the first message are detected during the channel monitoring process.

Based on the same inventive concept, the first device is also provided in the embodiment of the present application. The method corresponding to the first device is a method for transmitting a message, for example, as shown in FIG. See the implementation of the method, and the details are not repeated here.

The first device 1100 shown in FIG. 11 includes: a transceiver 1110 and a processor 1120, wherein the transceiver 1110 is configured to listen to a first message during channel monitoring, and the processor 1120 is configured to determine After the indication information is included in the first message, according to the indication information, it is determined that the first frame header is not detected during the channel monitoring process, and it is determined that the channel is in an idle state during the first time period for spatial multiplexing. The first message is that the second device is transmitted by using the first power, the first device 1100 is a device in the first basic service set BSS, the second device is a device in the second BSS, and the first BSS and the second BSS are mutually In order to overlap the basic service set OBSS, the indication information is used to indicate that the second device transmits the first frame header before transmitting the first message, and the transmission power of the at least one second message is the second power, and the second message is the second device. The message transmitted by the channel is occupied in the first time period after the first message is sent, the channel bandwidth occupied by the first frame header is greater than the channel bandwidth occupied by the first message, and the first frame header is used to indicate the channel in the second time frame. Busy to avoid the third device occupying the letter for the second time The second duration is the length of time required for the first device 1100 to complete the transmission of the first frame header to complete the transmission of the first message, and the third device is required to transmit the same channel bandwidth as the first frame header by using the channel. The coverage of the signal when the second device transmits the first message by using the second power is not greater than the coverage of the signal when the second device transmits the first frame header by using the first power;

In a possible implementation, the processor 1120 is further configured to determine that the transmit power of the third message is the third power, where the signal coverage of the first device 1100 when the third message is transmitted by using the third power is not greater than the second The device uses the first power to transmit the signal coverage when the first frame header is transmitted; the transceiver 1110 is further configured to transmit the third message by using the third power in the first time period.

In another possible implementation manner, the indication information includes a first sub-instruction information and a second sub-instruction information, where the first sub-instruction information is used to indicate that the second device sends the first frame header before transmitting the first message, where The two sub-instruction information is used to indicate that the transmit power of the at least one second message is the second power.

In a possible implementation, if the transceiver 1110 detects a noise signal that lasts for a third time before detecting the first message, after the first message is detected, the processor 1120 determines that the channel is busy. status.

In a possible implementation manner, after determining that the signal energy of the detected noise signal is greater than a preset signal energy threshold, the processor 1120 determines that the channel is in a busy state.

In a possible implementation, after the transceiver 1110 detects the first signal, after detecting the noise signal for the third duration, the processor 1120 determines that the signal energy of the detected noise signal is not greater than the pre- Setting the signal energy threshold to determine that the channel is idle during the first time period

In another possible implementation manner, after the transceiver 1110 detects the first frame header and the first message during the channel monitoring process, the processor 1120 determines that the channel is in a busy state.

The processor 1120 can be a general-purpose CPU (Central Processing Unit), a microprocessor, an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits for performing related operations. The technical solution provided by the embodiment of the present application is implemented.

It should be understood that although the first device 1100 shown in FIG. 11 only shows the processor 1120 and the transceiver 1110, in the specific implementation process, those skilled in the art should understand that the first device The 1100 contains other devices necessary to achieve proper operation. At the same time, those skilled in the art will appreciate that the first device 1100 may also include hardware devices that implement other additional functions, depending on the particular needs. In addition, the first device 1100 may also only include the devices or units necessary to implement the embodiments of the present application, and does not necessarily include all the devices shown in FIG.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the above program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a ROM (Read-Only Memory), or a RAM (Random Access Memory).

Based on the same inventive concept, a second device is also provided in the embodiment of the present application. Since the method corresponding to the second device is a method for transmitting a message, for example, as shown in FIG. 5, the implementation of the second device in the embodiment of the present application. See the implementation of the method, and the details are not repeated here.

The second device 1200, as shown in FIG. 12, includes a transceiver 1210 and a processor 1220, wherein the processor 1220 is configured to generate a first message, and the transceiver 1210 is configured to transmit the first message by using the first power.

The first message includes indication information, where the indication information is used to indicate that the second device 1200 transmits the first frame header before transmitting the first message, and that the transmit power of the at least one second message is the second power, the second message. The second device 1200 occupies the message transmitted by the channel in the first time period after the first message is sent, the channel bandwidth occupied by the first frame header is greater than the channel bandwidth occupied by the first message, and the second time period is the first device The time required to complete sending the first frame header to complete the transmission of the first message, the third device is a device that needs to transmit a message with the same channel bandwidth occupied by the first frame header through the channel, and the second device 1200 uses the second power transmission. The signal coverage in the first message is not greater than the signal coverage when the second device 1200 transmits the first frame header using the first power.

In a possible implementation manner, the transceiver 1210 transmits at least one second message by using the second power within the first time period after transmitting the first message by using the first power; or, the transceiver 1210 is transmitting by using the first power. After the first message, at least one second message transmitted by the second power is received within the first time period.

In another possible implementation, the indication information includes a first sub-instruction information and a second sub-instruction information, where the first sub-instruction information is used to indicate that the second device 1200 transmits the first frame header before transmitting the first message. The second sub-instruction information is used to indicate that the transmit power of the at least one second message is the second power.

The processor 1220 may be a general-purpose CPU, a microprocessor, an ASIC, or one or more integrated circuits for performing related operations to implement the technical solutions provided by the embodiments of the present application.

It should be noted that although the second device 1200 shown in FIG. 11 only shows the processor 1220 and the transceiver 1210, in a specific implementation process, those skilled in the art should understand that the second device 1200 includes a normal operation. Other devices that are required. At the same time, those skilled in the art will appreciate that the second device 1200 may also include hardware devices that implement other additional functions, depending on the particular needs. In addition, the second device 1200 may also include only the devices or units necessary to implement the embodiments of the present application, and does not necessarily include all of the devices shown in FIG.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the above program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The above storage medium may be a magnetic disk, an optical disk, a ROM, a RAM, or the like.

It can be seen from the foregoing that, in the embodiment of the present application, the first device detects the first message during the channel monitoring process, and after determining that the first message includes the indication information, determining, according to the indication information, that the first message is not detected during the channel monitoring process. When the first frame header is heard, it is determined that the channel is in an idle state for the first time period, and spatial multiplexing is performed. After the first frame header is not detected in the channel monitoring process and the indication information is included in the first message, the first device determines that the channel is in an idle state in the first time period, so compared with the prior art, Reduces interference between devices when performing spatial multiplexing.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware. Moreover, the application may employ computer-usable storage media (including but not limited to disk) in one or more of the computer-usable program code embodied therein. The form of a computer program product implemented on a memory, CD-ROM, optical memory, or the like.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to the embodiments once they are aware of the basic inventive concept.

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims

A method for transmitting a message, comprising:

The first device detects the first message in the channel monitoring process, where the first message is transmitted by the second device by using the first power, the first device is a device in the first basic service set BSS, and the second device is For the device in the second BSS, the first BSS and the second BSS are mutually overlapping basic service sets OBSS;

Determining, by the first device, that the first message includes indication information, where the indication information is used to indicate that the second device transmits a first frame header before transmitting the first message, and indicates at least one The second message is a second power, and the second message is a message that is used by the second device to occupy the channel during the first time period after the first message is sent, where the first frame header is occupied. The channel bandwidth is greater than the channel bandwidth occupied by the first message, and the first frame header is used to indicate that the channel is busy in the second time period, so as to prevent the third device from occupying the channel in the second time period, the second The duration is the length of time required by the first device of the first device to complete the sending of the first frame to the completion of sending the first message, and the third device needs to transmit through the channel and the first device. a device that uses a message with the same channel bandwidth as the frame header, and the second device uses the second power to transmit the first message when the signal coverage is not greater than the second device uses the first power Signal coverage at the exit of the first header;

Determining, by the first device, that the first frame header is not detected during the channel monitoring process according to the indication information, determining that the channel is in an idle state during the first time duration, and performing spatial multiplexing .
The method of claim 1, wherein the first device performs spatial multiplexing, comprising:

The first device determines that the transmit power of the third message is the third power, where the signal coverage of the third device when the third device uses the third power to transmit the third message is not greater than that used by the second device. a signal coverage range when the first power is transmitted by the first frame header;

The first device transmits the third message by using the third power within the first duration.
The method according to claim 1 or 2, wherein the indication information comprises the first sub-instruction information and the second sub-instruction information, where the first sub-instruction information is used to indicate that the second device is The first frame header is transmitted before the first message is transmitted, and the second sub-instruction information is used to indicate that the transmit power of the at least one second message is the second power.
The method of any one of claims 1 to 3, further comprising:

If the first device detects a noise signal that lasts for a third time before detecting the first message, after detecting the first message, determining that the channel is in a busy state.
The method of claim 4, wherein the determining, before the determining that the channel is in a busy state, the first device further comprises:

The first device determines that the signal energy of the detected noise signal is greater than a preset signal energy threshold.
The method according to any one of claims 1 to 3, wherein the first device determines that the channel is in an idle state during the first time period, and further includes:

Before the first device listens to the first message, the first device detects a noise signal that lasts for a third time period, and the signal energy of the detected noise signal is not greater than a preset signal energy threshold.
The method of any one of claims 1 to 3, further comprising:

The first device detects the first frame header and the first message during channel monitoring, and determines that the channel is in a busy state.
A method for transmitting a message, comprising:

The second device generates a first message, where the first message includes indication information, where the indication information is used to indicate that the second device transmits the first frame header before transmitting the first message, and indicates at least one The second message is a second power, and the second message is a message that is used by the second device to occupy the channel during the first time period after the first message is sent, where the first frame header is occupied. The channel bandwidth is greater than the channel bandwidth occupied by the first message, and the second duration is the length of time required by the first device to complete the sending of the first frame header to complete the sending of the first message. The third device is a device that needs to transmit a message with the same channel bandwidth occupied by the first frame header through the channel, where the second device uses the second power to transmit the first message The coverage of the number is not greater than the coverage of the signal when the second device transmits the first frame header by using the first power;

The second device transmits the first message by using a first power.
The method of claim 8, wherein after the transmitting, by the first device, the first message, the first device further comprises:

Transmitting, by the second device, the at least one second message by using the second power in the first duration; or

The second device receives the at least one second message transmitted by the second power within the first duration.
The method according to claim 8 or 9, wherein the indication information comprises the first sub-instruction information and the second sub-instruction information, where the first sub-instruction information is used to indicate that the second device is The first frame header is transmitted before the first message is transmitted, and the second sub-instruction information is used to indicate that the transmit power of the at least one second message is the second power.
A first device, comprising:

a transceiver, configured to detect a first message during channel monitoring, where the first message is transmitted by the second device by using a first power, where the first device is a device in the first basic service set BSS, The second device is a device in the second BSS, and the first BSS and the second BSS are mutually overlapping basic service sets OBSS;

a processor, after determining that the indication information is included in the first message, determining, according to the indication information, that the first frame header is not detected during the channel monitoring process, determining that the first frame header is The channel is in an idle state for a period of time to communicate by spatial multiplexing;

The indication information is used to indicate that the second device sends the first frame header before transmitting the first message, and that the transmit power of the at least one second message is the second power, and the second message is The second device occupies the message transmitted by the channel in the first time period after the first message is sent, where the channel bandwidth occupied by the first frame header is greater than the channel bandwidth occupied by the first message, and The first frame header is used to indicate that the channel is busy in the second time period, to prevent the third device from occupying the channel in the second time period, and the second time period is that the first device is finished from the first device. The time required to send the first frame header to complete the transmission of the first message, where the third device is a device that needs to transmit a message with the same channel bandwidth occupied by the first frame header through the channel. The signal coverage of the second device when the first message is transmitted by using the second power is not greater than the signal coverage range when the second device uses the first power to transmit the first frame header.
The first device of claim 11, wherein the processor is further configured to:

Determining that the transmit power of the third message is the third power, where the signal coverage of the third device when the third device is used to transmit the third message is not greater than the second device using the first power transmit Signal coverage of the first frame header;

The transceiver is further configured to transmit the third message by using the third power within the first duration.
The first device according to claim 11 or 12, wherein the indication information comprises the first sub-instruction information and the second sub-instruction information, and the first sub-instruction information is used to indicate the second The device transmits a first frame header before transmitting the first message, where the second sub-instruction information is used to indicate that the transmit power of the at least one second message is the second power.
The first device according to any one of claims 11 to 13, wherein the processor is further configured to:

If the transceiver detects a noise signal that lasts for a third period of time before the first message is heard, determining that the channel is busy after detecting the first message.
The first device according to claim 14, wherein the processor is further configured to: before determining that the channel is in a busy state, determine that a signal energy of the detected noise signal is greater than a preset signal energy threshold. .
The first device according to any one of claims 11 to 13, wherein the processor is further configured to:

Before the transceiver detects the first message, after detecting the noise signal for the third duration, determining that the signal energy of the detected noise signal is not greater than a preset signal energy threshold, determining The channel in the first time period is in an idle state.
A first device according to any one of claims 11 to 13, wherein said processing Also used to:

After the transceiver detects the first frame header and the first message during channel monitoring, it is determined that the channel is in a busy state.
A second device, comprising:

a processor, configured to generate a first message, where the first message includes indication information, where the indication information is used to indicate that the second device transmits a first frame header before transmitting the first message, and indicates that at least The second message is a second power, and the second message is a message that is transmitted by the second device in the first time period after the first message is sent, where the first frame header is The occupied channel bandwidth is greater than the channel bandwidth occupied by the first message, and the second duration is the length of time required by the first device to complete the sending of the first frame header to complete the sending of the first message. The third device is a device that needs to transmit a message with the same channel bandwidth occupied by the first frame header through the channel, and the second device uses the second power to transmit a signal coverage when the first message is sent. The range is not greater than a signal coverage range when the second device uses the first power to transmit the first frame header;

And a transceiver, configured to transmit the first message by using a first power.
The second device according to claim 18, wherein the transceiver is further configured to:

After transmitting the first message by the first power, transmitting the at least one second message by the second power within the first duration; or

After transmitting the first message by the first power, receiving the at least one second message transmitted by the second power within the first duration.
The second device according to claim 18 or 19, wherein the indication information comprises the first sub-instruction information and the second sub-instruction information, and the first sub-instruction information is used to indicate the second The device transmits the first frame header before transmitting the first message, and the second sub-instruction information is used to indicate that the transmit power of the at least one second message is the second power.