CN102624483B - Method and device for data transmission - Google Patents

Abstract

The invention discloses a method and a device for data transmission, which relate to the technical field of communication. Power strength signals are used for representing transmission power used by other network devices by attenuating the obtained power strength signals; attenuated power strength signals are compared with a preset disturbance threshold; and when the attenuated power strength signals are smaller than the disturbance threshold, a data frame is sent. The method and the device for the data transmission can achieve that two and more than two devices on the same frequency channel can send the data frame simultaneously, improve channel use rate, and are mainly applied to wireless local area network technology.

Description

Method and device for data transmission

technical field

The present invention relates to the field of communication technology, in particular to a data transmission method and equipment. the

Background technique

With the development of communication technology, wireless local area network (Wireless Local Area Network, referred to as WLAN) technology has developed rapidly and grown into the current mainstream technology in just a few years. WLAN technology uses air as the medium to transmit data in half-duplex mode. the

In half-duplex data transmission mode, more than two devices on the same frequency channel, such as Access Point (AP for short) or workstation (Station) cannot send data frames at the same time, if there are at least If two devices are sending data frames, each device will be interfered by data frames sent by other devices and cannot correctly send the data frames to the corresponding receiving device. The prior art uses the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism to avoid the situation that two devices simultaneously send data on a certain frequency channel. Specifically, before sending a certain data frame, a certain device needs to monitor whether other devices are sending data frames. If no other device is sending data frames, send data frames directly; if other devices are sending data frames, wait for a frame interval and a random back-off time after the device finishes sending data frames and then monitor whether there are other devices again A data frame is being sent, and the data frame is not sent until no other device on the channel is sending a data frame. the

In practical applications, some devices are far away from each other, and the interference between devices caused by sending data frames is very small and can be approximately ignored. In this scenario, the device still sends data frames according to the existing sending method, resulting in low data transmission efficiency and wasting channel transmission resources. the

Contents of the invention

Embodiments of the present invention provide a method and device for data transmission, which can allow multiple devices to send data frames simultaneously on the same frequency channel, can improve the efficiency of data transmission, and make full use of channel transmission resources. the

On the one hand, the embodiment of the present invention provides a method for data transmission, including:

Attenuating the acquired power strength signal, where the power strength signal is used to characterize the transmit power used by other network devices;

Comparing the attenuated power strength signal with a preset interference threshold;

When the attenuated power strength signal is smaller than the interference threshold, a data frame is sent. the

On the other hand, an embodiment of the present invention also provides a device for data transmission, including an attenuator, a comparator, and a transmitter, wherein,

The attenuator is used to attenuate the obtained power strength signal, and the power strength signal is used to represent the transmission power used by other devices;

The comparator is used to compare the power strength signal attenuated by the attenuator with a preset interference threshold;

The transmitter is configured to send a data frame when the power strength signal attenuated by the attenuator is smaller than the interference threshold. the

The method and device for data transmission provided by the embodiments of the present invention can attenuate the acquired power intensity signal of other equipment on the same frequency channel before sending the data frame, and the power intensity signal of the other equipment is used to represent the power intensity signal sent by other equipment. The transmit power of the data frame. If the attenuated power strength signal is smaller than the preset interference threshold, the data frame is sent. In a scenario where devices are far away and mutual interference can be approximately ignored, allowing multiple devices to send data frames at the same time can improve the efficiency of data transmission and make full use of channel transmission resources. the

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work. the

Fig. 1 is the method flowchart of data transmission in the embodiment of the present invention;

Fig. 2 is the schematic diagram of data transmission in the embodiment of the present invention;

Fig. 3 is the method flowchart of another data transmission in the embodiment of the present invention;

Fig. 4 is the schematic diagram of another data transmission in the embodiment of the present invention;

Fig. 5 is another method flowchart of data transmission in the embodiment of the present invention;

Fig. 6 is the structural representation of the equipment of data transmission in the embodiment of the present invention;

Fig. 7 is a schematic structural diagram of another data transmission device in an embodiment of the present invention;

Fig. 8 is a schematic diagram of another data transmission in the embodiment of the present invention. the

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. the

The embodiment of the present invention provides a method for data transmission, as shown in Figure 1, the method includes the following steps:

101. The first device attenuates the acquired power strength signal. the

The power strength signal is used to represent the size of the transmission power used by other devices to send data frames. The first device may be a network side device including an AP, or may be a terminal side device including a workstation. the

102. The first device compares the attenuated power strength signal with a preset interference threshold. the

When the attenuated power strength signal is greater than or equal to the preset interference threshold value, the first device believes that the data frame sent by other sender devices will affect the correct reception of the data frame by the receiver device corresponding to the first device, so it does not send data frame. When the attenuated power strength signal is less than the preset interference threshold value, the first device believes that the data frames sent by other sender devices will not or approximately will not affect the correct reception of data frames by the receiver device corresponding to the first device, so Send a data frame. For example, as shown in FIG. 2 , device 1 communicates with device 3 , and device 2 communicates with device 4 . As the first device, device 1 needs to send data frame A to device 3, while device 2 is sending data frame B to device 4 at this time. Device 1 and Device 2 use the same frequency channel to send data frames. The device 1 attenuates the acquired power strength signal of the data frame B sent by the device 2. When the attenuated power strength signal is greater than or equal to the preset interference threshold, device 1 believes that device 2's transmission of data frame B will affect device 3's correct reception of data frame A, so it does not send the data frame. When the attenuated power strength signal is less than the preset interference threshold, device 1 considers that the data frame sent by device 2 will not or approximately will not affect the correct reception of data frame A by device 3, so it sends the data frame. the

It should be noted that, the obtained power strength signal may be the transmission power used by other devices when sending data frames obtained by the first device on the port. The other devices may be multiple devices, the first device respectively attenuates multiple power strength signals on the port, and when all the attenuated power strength signals are less than a preset interference threshold, the first device sends a data frame . the

103. When the attenuated power strength signal is smaller than the interference threshold, the first device sends a data frame. the

Still as shown in Figure 2, when the comparison result shows that the power strength signal after attenuation is less than the interference threshold value, device 1 can send data frame B to device 3 on the same frequency channel while device 2 is sending data frame B to device 4. dataframeA. For this frequency channel, data frames can be sent by two devices simultaneously on this channel at a certain moment. Due to the long distance between device 3 and device 2, the influence of device 2 sending data frame B on device 3's correct reception of data frame A can be ignored, and in the existing CSMA/CA mechanism, even if device 2 sends data frame B to device 3 The impact of correctly receiving data frame A is negligible. While device 2 is sending data frame B to device 4, device 1 cannot send data frame A to device 3 either. Compared with the existing mechanism, through the technical solution provided by the embodiment of the present invention, the channel utilization rate of the scene shown in FIG. 2 is doubled. When 3, 4, or 5 devices simultaneously transmit data frames on a certain frequency channel, the channel utilization rate is higher and the transmission resource utilization is more sufficient. the

It should be noted that in Figure 2, device 1 does not reduce the actual transmission power value of data frame B sent by device 2, but instead reduces the power intensity signal obtained on the port of device 1 and used to characterize the transmission power of device 2 The attenuation is to attenuate the transmit power value of device 2 from the perspective of device 1's "knowledge" of the transmit power of device 2. For the scenario where the distance between device 2 and device 3 is relatively long and the interference is almost negligible, device 1 can “think” that the interference from device 2 to device 1 is small enough to transmit to device 4 by attenuating the power signal of device 2. At the same time as the data frame B, the data frame A is sent to the device 3, thereby improving the channel utilization. the

In the embodiment of the present invention, due to the interactive communication between the devices, the receiver device can also send the data frame, and when sending the data frame, the device is the sender device. For example, device 3 and device 4 in Figure 2, device 3 and device 4 as sender devices respectively send data frames to device 1 and device 2 in the same way as device 1 sends data frames, and will not be repeated here . the

The data transmission method provided by the embodiment of the present invention can attenuate the acquired power intensity signals of other devices on the same frequency channel before sending data frames, and the power intensity signals of other devices are used to represent data frames sent by other devices the size of the transmit power. If the attenuated power strength signal is smaller than the preset interference threshold, the data frame is sent. In a scenario where devices are far away and mutual interference can be approximately ignored, allowing multiple devices to send data frames at the same time can improve the efficiency of data transmission and make full use of channel transmission resources. the

Further, the embodiment of the present invention also provides a data transmission method, as shown in Figure 3, the method is a further extension of the method shown in Figure 1, and the method includes:

301. The first device attenuates the acquired power strength signal. the

The power strength signal is used to represent the size of the transmission power used by other devices to send data frames. The first device may be a network side device including an AP, or may be a terminal side device including a workstation. the

In an application scenario of the embodiment of the present invention, due to path loss, the power strength signal of other devices acquired by the first device is smaller than the actual transmit power of other devices. In the embodiment of the present invention, the power strength signal may also be used to represent the magnitude of the transmission power passing through the path loss. the

Still as shown in Figure 2, the transmission power of device 2 to send data frame B is 100 milliwatts (Milliwatt, mW for short). Due to the effect of wireless channel path loss, the power intensity signal of device 2 acquired by device 1 at a certain distance is -75 decibels above 1 milliwatt (dBm for short), converted to milliwatts is about 0.000000032mW. For calculation convenience, the power strength signal is in dBm. the

The attenuating the power intensity signal by the first device specifically includes: attenuating the power intensity signal by the first device according to a preset signal attenuation value. The signal attenuation value can be set by the network administrator according to the needs of practical applications. In the embodiment of the present invention, the signal attenuation value is 25 dBm as an example for illustration, and there is no limit to the signal attenuation value in practical applications. Still as shown in Figure 2, the transmission power of device 2 sending data frame B is 20dBm, the power strength signal of device 2 obtained by device 1 is -75dBm, and device 1 attenuates the power strength signal of device 2 according to the preset signal attenuation value It is -100dBm, namely -75dBm-25dBm=-100dBm. the

302. The first device compares the attenuated power strength signal with a preset interference threshold. the

When the attenuated power strength signal is greater than or equal to the preset interference threshold, the first device believes that other devices on the channel are sending data frames, and their transmission power will affect the correct sending of data frames by the device. When the attenuated power strength signal is smaller than the preset interference threshold, the first device considers that no other device on the channel is sending the data frame, and then sends the data frame. The setting of the interference threshold is related to the transmission power of other devices, the distance between devices, and the properties of transmission media. For example, the interference threshold of a device with a transmission power greater than 20dBm is not greater than -80dBm, the interference threshold of a device with a transmission power between 17dBm and 20dBm can be equal to -76dBm, and the interference threshold of a device with a transmission power less than or equal to 17dBm The limit may be equal to -70dBm. The farther the distance between devices, the greater the path loss in the same transmission medium, so the interference threshold is correspondingly smaller. The setting of the interference threshold is not limited in this embodiment of the present invention. the

303. When the attenuated power strength signal is smaller than the interference threshold, the first device sends a data frame. the

For example, still as shown in FIG. 2 , device 1 communicates with device 3 , and device 2 communicates with device 4 . As the first device, device 1 needs to send data frame A to device 3, while device 2 is sending data frame B to device 4 at this time. Device 1 and Device 2 use the same frequency channel to send data frames. Take the power strength signal of device 2 measured by device 1 as -75dBm, the signal attenuation value is 25dBm, and the interference threshold value is -76dBm as an example: in the existing CSMA/CA mechanism, since the power strength signal is -75dBm greater than the interference The threshold value is -76dBm, so device 1 "thinks" that device 2 is sending data frame B. In order to avoid mutual interference caused by device 1 and device 2 sending data frames on the same channel at the same time, device 1 will wait for device 2 to finish sending data Frame B, and after device 2 sends data frame B, wait for a frame interval and a random back-off time in sequence, and then monitor whether there are other devices in the channel that are sending data frames, if so, continue to wait, if not, send data frames a. In the embodiment of the present invention, device 1 attenuates the power strength signal of device 2 by 25dBm, that is, from the original -75dBm to -100dBm. Compared with the interference threshold -76dBm, the attenuated power strength signal is less than the interference threshold Limit value, device 1 "thinks" that device 2 is not sending a data frame, then device 1 can send data frame A. In fact, when device 1 is sending data frame A, device 2 is sending data frame B, but the device thinks that device 2 is not sending data frame B from the perspective of "cognition". Since the device 3 is far away from the device 2 in FIG. 2 , the interference of the transmission power of the device 2 sending the data frame B on the correct reception of the data frame A by the device 3 can be approximately ignored. the

Suppose it takes 1ms (milliseconds) to send data frames A and B each, the frame interval is 10ms, and the random backoff time is at least 2ms. In the CSMA/CA mechanism, it takes 14ms to send data frames A and B (send data frame B1ms + frame interval 10ms + random Backoff time 2ms+ send data frame B1ms). However, in the embodiment of the present invention, sending data frames A and B requires at least 1 ms (device 1 and device 2 send data frames at the same time), and at most 2 ms (device 1 and device 2 send data frames sequentially). Compared with the existing mechanism, it saves at least 12ms. the

304. When the attenuated power strength signal is greater than or equal to the interference threshold, the first device attenuates the attenuated power strength signal again. the

In another application scenario of the embodiment of the present invention, the first device may attenuate the attenuated power strength signal again according to a preset signal attenuation value. The embodiment of the present invention does not limit the signal attenuation value. Specifically, as shown in Figure 2, taking the power strength signal of device 2 as -55dBm, the signal attenuation value as 10dBm, and the interference threshold as -76dBm as an example: device 1 converts the power strength signal of device 2 according to the signal attenuation value After attenuation, the power strength signal after attenuation is -65dBm, which is still greater than the interference threshold. At this time, the device 1 attenuates the attenuated power intensity signal again according to the signal attenuation value to obtain the attenuated power intensity signal of -75 dBm again. Then step 302 is repeated to compare the attenuated power strength signal with the preset interference threshold value. If the power strength signal after again attenuation is smaller than the preset interference threshold value, device 1 sends data frame A, If the power strength signal after attenuation is still greater than or equal to the preset interference threshold value, device 1 repeats step 304 and step 302 until the power strength signal is attenuated to less than the interference threshold value, and then sends data frame A . In this application scenario, device 1 repeatedly executes step 304 and step 302 twice, attenuates the power strength signal to -85dBm, which is less than the interference threshold -76dBm, and then sends data frame A. the

Further, in another application scenario of the embodiment of the present invention, the packet loss rate of the data frames sent by the first device can also be monitored, and the packet loss rate is the ratio of the number of lost data frames in the data frame transmission to the number of transmitted data frames . When the packet loss rate is greater than or equal to the preset packet loss rate threshold, it indicates that other devices that are sending data frames on the same frequency channel will affect the correct reception of data frames by the receiver device of the first device. As shown in Figure 4, while device 2 is sending data frame C, device 1 needs to continuously send two data frames A and B, and after sending data frame A, monitor the packet loss rate of data frame A. the

If the packet loss rate of data frame A is less than or equal to the packet loss rate threshold, device 1 may attenuate the power strength signal obtained when sending data frame B according to the original signal attenuation value. the

If the packet loss rate of data frame A is greater than the packet loss rate threshold, for example, greater than 10%, when device 1 sends data frame B, as shown in Figure 5, it needs to perform the following steps:

501. The first device reduces a signal attenuation value. the

The reduction of the signal attenuation value can be achieved in the following two ways:

1) The signal attenuation value is halved to form a new signal attenuation value. For example, it is halved from 10dBm to 5dBm, thereby reducing the degree of attenuation. the

2) Subtracting the preset signal attenuation step from the preset signal attenuation value to form a new signal attenuation value. For example, the original signal attenuation value is 10dBm, the preset signal attenuation step is 2dBm, and the new signal attenuation value is 8dBm by subtracting the signal attenuation step from the original signal attenuation value. the

Optionally, when the packet loss rate of data frame A is greater than or equal to the packet loss rate threshold, the power strength signal when sending data frame B may not be attenuated. the

502. The first device attenuates the reacquired power strength signal by using the reduced signal attenuation value. the

503. The first device monitors the packet loss rate of resent data frames. the

If the packet loss rate of data frame B is greater than the packet loss rate threshold, step 501 is repeated, that is, the signal attenuation value is reduced again according to the two implementations of reducing the signal attenuation value in step 501 . the

It should be noted that reducing the attenuation degree of data frame B or not attenuating the power strength signal when sending data frame B does not guarantee that the power strength signal when sending data frame B must be greater than or equal to the interference threshold, and It is to reduce or not attenuate the power strength signal when sending the data frame B, so that the power strength signal tends to be greater than or equal to the interference threshold value. However, according to whether the power strength signal is less than the interference threshold, it is the implementation method of the prior art to decide whether to send the data frame B, that is, according to the existing CSMA/CA mechanism, if the power strength signal when sending the data frame B is less than the interference threshold value, it indicates that device 2 is not sending data frame C, and at this time device 1 can send data frame B; if the power strength signal when sending data frame B is greater than or equal to the interference threshold, it indicates that device 2 is sending data frame C , at this time device 1 does not send data frame B. the

Further optionally, when the packet loss rate of data frame A sent by device 1 is greater than or equal to the packet loss rate threshold value, it can also resend data frame A, and the resent data frame A can refer to the above-mentioned sending data frame B The implementation manner will not be repeated in this embodiment of the present invention. the

In this embodiment of the present invention, the parameters that can be used to characterize that the device correctly receives the data frame are not limited to the packet loss rate. For other parameters used to indicate that the device correctly receives the data frame, its implementation is the same as when the packet loss rate is used as a parameter, and will not be repeated here. the

In the data transmission method provided by the embodiment of the present invention, before sending the data frame, attenuate the acquired power strength signal of other devices on the same frequency channel, and the power strength signal of the other device is used to represent the power of the other device to send the data frame transmit power size. If the attenuated power strength signal is smaller than the preset interference threshold, the data frame is sent. In a scenario where devices are far away and mutual interference can be approximately ignored, allowing multiple devices to send data frames at the same time can improve the efficiency of data transmission and make full use of channel transmission resources. the

In addition, the data transmission method provided by the embodiment of the present invention can also monitor the packet loss rate of the sent data frame. When the packet loss rate is greater than the boundary value that can ensure the correct transmission of the data frame, in the subsequent process of sending the data frame, reduce Small or no attenuation of the power strength signal, so as to give priority to the transmission success rate of the data frame. the

Referring to FIG. 6 , it is a data transmission device provided by an embodiment of the present invention, which is used to implement the methods shown in FIGS. 1 and 3 of the present invention. The device 60 may be a network side device including an AP, or a terminal side device including a workstation. As shown in Figure 6, the device 60 includes an attenuator 61, a comparator 62 and a transmitter 63, wherein,

The attenuator 61 is configured to attenuate the acquired power strength signal, and the power strength signal is used to represent the transmit power used by other devices. the

The comparator 62 is used to compare the power strength signal attenuated by the attenuator 61 with a preset interference threshold. the

When the power strength signal attenuated by the attenuator 61 is greater than or equal to the preset interference threshold, it can be considered that other devices on the channel are sending data frames, and their transmission power will affect the correct sending of data frames by the device 60 . When the power strength signal attenuated by the attenuator 61 is smaller than the preset interference threshold, it can be considered that no other device on the channel is sending data frames, and the device 60 can send data frames. The setting of the interference threshold is related to the transmission power of other devices, the distance between devices, and the properties of transmission media. For example, the interference threshold of a device with a transmission power greater than 20dBm is not greater than -80dBm, the interference threshold of a device with a transmission power between 17dBm and 20dBm can be equal to -76dBm, and the interference threshold of a device with a transmission power less than or equal to 17dBm The limit may be equal to -70dBm. The farther the distance between devices, the greater the path loss in the same transmission medium, so the interference threshold is correspondingly smaller. The setting of the interference threshold is not limited in this embodiment of the present invention. the

The transmitter 63 is configured to send a data frame when the power strength signal attenuated by the attenuator 61 is smaller than the interference threshold. the

Further, the attenuator 61 is specifically configured to attenuate the power strength signal according to a preset signal attenuation value. the

The signal attenuation value can be set by the network administrator according to the needs of practical applications. In the embodiment of the present invention, the signal attenuation value is 25 dBm as an example for illustration, and there is no limit to the signal attenuation value in practical applications. the

Further, when the power strength signal attenuated by the attenuator 61 is greater than or equal to the interference threshold value, the attenuator 61 is also used to adjust the attenuated power signal according to the preset signal attenuation value. The intensity signal is again attenuated. the

Correspondingly, the comparator 62 is further configured to compare the power strength signal attenuated again by the attenuator 61 with the interference threshold value. the

The transmitter 63 is further configured to send a data frame when the power strength signal attenuated again by the attenuator 61 is smaller than the interference threshold value. the

Further, as shown in FIG. 7 , the device 60 may further include a monitor 71 and a processor 72 for implementing the method shown in FIG. 5 of the present invention. the

The monitor 71 is used for monitoring the packet loss rate of the data frame sent by the transmitter 63 . the

The packet loss rate is the ratio of the number of lost data frames in the data frame transmission to the number of transmitted data frames. When the packet loss rate is greater than or equal to the preset packet loss rate threshold value, it indicates that simultaneous transmission of data frames by multiple devices on the same frequency channel will affect the correct reception of data frames by the receiver device of the device 60 . the

When the packet loss rate monitored by the monitor 71 is greater than or equal to the preset packet loss rate threshold:

The processor 72 is used to halve the preset signal attenuation value, for example, from 10dBm to 5dBm to form a new signal attenuation value; or, to subtract the preset signal attenuation value from the preset signal attenuation value Set the signal attenuation step, for example, the original signal attenuation value is 10dBm, and the preset signal attenuation step is 2dBm to form a new signal attenuation value. the

It should be noted that the processor 72 reduces the degree of attenuation of the data frame B or does not guarantee that the power strength signal when sending the data frame B must be greater than or equal to the interference threshold , but reduce or not attenuate the power strength signal when sending the data frame B, so that the power strength signal tends to be greater than or equal to the interference threshold. It is an implementation in the prior art to decide whether to send the data frame B according to whether the power strength signal is smaller than the interference threshold. the

Further, the device may further include a radio frequency link device, and the radio frequency link device is used to acquire power strength signals of other devices. The radio frequency link device may be connected to the attenuator 61 . the

Alternatively, the radio frequency receiving chain device may also include the attenuator 61 , the comparator 62 and the transmitter 63 . the

The data transmission equipment provided by the embodiment of the present invention includes, but is not limited to, an access point (Access Point, AP) and a workstation (Station) in a wireless local area network (WLAN). Devices or equipment with a wireless data transmission function in other application scenarios also belong to the The devices described in the embodiments of the present invention will not be enumerated here one by one. In addition, the data transmission device described in the embodiment of the present invention has both the sending function and the receiving function in the method embodiment, so as to ensure interactive communication between devices in practical applications. the

In an application scenario of the embodiment of the present invention, the AP and the Station perform wireless data interaction in half-duplex mode, and both the AP and the Station can be used as sending data frames. When one of them is used as a sender device, the other is used as a receiver device . As shown in Figure 8, AP1 can only exchange data with Station1, and AP2 can only exchange data with Station2, and AP1, Station1, AP2, and Station2 perform data exchange on the same frequency channel. When AP1 is sending data frame A to Station1, since AP1 is far away from Station2, the interference of AP1's transmit power on Station2's reception of data frame B sent by AP2 can be approximately ignored. So at this time, although the power strength signal of AP1 obtained by AP2 is higher than the interference threshold, AP2 can attenuate the power strength signal of AP1 to be less than the interference threshold, so that when AP1 sends data frame A, AP2 can send data frame A to Station2. Send data frame B, so that two or more devices on the same frequency channel can send data frames at the same time, saving network resources. The implementation of the Station as the sender device sending data frames to the AP is the same as that of the AP sending data frames, and will not be repeated here. the

The data transmission method and equipment provided by the embodiments of the present invention can be applied to various communication systems, and these systems include: Wideband Code Division Multiple Access (WCDMA for short) system, Long Term Evolution (LTE for short) ) system, Global System for Mobile Communications (GSM for short) system, etc. the

By adopting the technical solution provided by the embodiment of the present invention, the acquired power strength signals of other devices on the same frequency channel can be attenuated before sending the data frame. If the attenuated power strength signal is smaller than the preset interference threshold, the data frame is sent. In this way, in a scenario where the distance between devices is far away and mutual interference can be approximately ignored, multiple devices are allowed to send data frames at the same time, which can improve the efficiency of data transmission and make full use of channel transmission resources. At the same time, by monitoring the packet loss rate of the sent data frame, when the packet loss rate is greater than the boundary value that can ensure the correct transmission of the data frame, in the process of subsequent data frame transmission, the power strength signal is reduced or not attenuated, and the data frame can be guaranteed transmission success rate. the

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by means of software plus necessary general-purpose hardware, and of course also by hardware, but in many cases the former is a better embodiment . Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, such as a floppy disk of a computer , a hard disk or an optical disk, etc., including several instructions for enabling a computer device (which may be a personal computer, server, or device, etc.) to execute the methods described in various embodiments of the present invention. the

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. the

Claims (8)

1. A method of data transmission, comprising:

attenuating the obtained power intensity signal, wherein the power intensity signal is used for representing the transmitting power used by other network equipment on the same frequency channel;

comparing the attenuated power intensity signal with a preset interference threshold value;

and when the attenuated power strength signal is smaller than the interference threshold value, transmitting a data frame to a receiver device on the same frequency channel used by the other network devices, wherein the interference between the receiver device and the other network devices is approximately negligible.

2. The method according to claim 1, wherein the attenuating the power strength signal comprises:

and attenuating the power intensity signal according to a preset signal attenuation value.

3. The method of claim 2, further comprising: when the attenuated power strength signal is greater than or equal to the interference threshold,

attenuating the attenuated power intensity signal again according to the preset signal attenuation value;

comparing the power intensity signal after being attenuated again with the interference threshold value;

and when the power intensity signal after the re-attenuation is smaller than the interference threshold value, transmitting a data frame on the same frequency channel used by the other network equipment.

4. The method of claim 2 or 3, wherein after the transmitting of the data frame on the same frequency channel as used by the other network device, the method further comprises:

monitoring the packet loss rate of the data frame;

when the packet loss rate is greater than or equal to a preset packet loss rate threshold value, halving the preset signal attenuation value to form a new signal attenuation value; or,

and subtracting a preset signal attenuation step from the preset signal attenuation value to form a new signal attenuation value.

5. An apparatus for data transmission, comprising an attenuator, a comparator and a transmitter, wherein,

the attenuator is used for attenuating the acquired power strength signal, and the power strength signal is used for representing the transmitting power used by other network equipment on the same frequency channel;

the comparator is used for comparing the power intensity signal attenuated by the attenuator with a preset interference threshold value;

the transmitter is configured to transmit a data frame to a receiving device on the same frequency channel as that used by the other network device when the power strength signal attenuated by the attenuator is smaller than the interference threshold value, where interference between the receiving device and the other network device is approximately negligible.

6. The apparatus of claim 5, wherein the attenuator is specifically configured to attenuate the power strength signal by a preset signal attenuation value.

7. The device of claim 6, wherein when the attenuated power strength signal is greater than or equal to the interference threshold, the attenuator is further configured to attenuate the attenuated power strength signal again according to the preset signal attenuation value;

the comparator is further configured to compare the power intensity signal attenuated again by the attenuator with the interference threshold value;

the transmitter is further configured to transmit a data frame on the same frequency channel used by the other network device when the power strength signal attenuated again by the attenuator is smaller than the interference threshold value.

8. The apparatus of claim 6 or 7, further comprising:

a monitor, configured to monitor a packet loss rate of the data frame sent by the sender;

a processor, configured to, when the packet loss rate monitored by the monitor is greater than or equal to a preset packet loss rate threshold value,

halving the preset signal attenuation value to form a new signal attenuation value;

or subtracting a preset signal attenuation step from the preset signal attenuation value to form a new signal attenuation value.