CN102624483A - Method and device for data transmission - Google Patents
Method and device for data transmission Download PDFInfo
- Publication number
- CN102624483A CN102624483A CN2012100536293A CN201210053629A CN102624483A CN 102624483 A CN102624483 A CN 102624483A CN 2012100536293 A CN2012100536293 A CN 2012100536293A CN 201210053629 A CN201210053629 A CN 201210053629A CN 102624483 A CN102624483 A CN 102624483A
- Authority
- CN
- China
- Prior art keywords
- data frame
- signal
- power
- attenuated
- preset
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000002238 attenuated effect Effects 0.000 claims abstract description 60
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000007246 mechanism Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 101100172132 Mus musculus Eif3a gene Proteins 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000019771 cognition Effects 0.000 description 1
- 230000001149 cognitive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
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
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for data transmission.
Background
With the development of communication technology, Wireless Local Area Network (WLAN) technology is rapidly developing and growing, and is currently the mainstream technology in short years. The WLAN technology performs data transmission in a half duplex mode using air as a medium.
In a half-duplex data transmission mode, more than two devices, such as an Access Point (AP) or a workstation (Station), on the same frequency channel cannot simultaneously transmit a data frame, and if at least two devices are transmitting data frames on the same frequency channel at the same time, each device may be interfered by other devices transmitting data frames and cannot correctly transmit data frames to a corresponding receiving device. In the prior art, a Carrier Sense Multiple Access with connectivity aveidance (CSMA/CA) mechanism is used to avoid a situation that two devices transmit data on a certain frequency channel at the same time. Specifically, before a certain device sends a certain data frame, it needs to monitor whether other devices are sending the data frame. If no other device is transmitting the data frame, directly transmitting the data frame; if other equipment is sending data frame, the equipment waits for a frame interval and random back-off time after finishing sending data frame, and then monitors whether other equipment is sending data frame again, and sends out the data frame until no other equipment is sending data frame on the channel.
In practical application, some devices are far away from each other, and interference between the devices due to data frame transmission is small and can be approximately ignored. In such a scenario, the device still transmits the data frame according to the existing transmission method, which results in low data transmission efficiency and wastes transmission resources of the channel.
Disclosure of Invention
Embodiments of the present invention provide a method and an apparatus for data transmission, which can allow multiple apparatuses to simultaneously send data frames on the same frequency channel, so as to improve data transmission efficiency and fully utilize transmission resources of the channel.
In one aspect, an embodiment of the present invention provides a data transmission method, including:
attenuating the obtained power strength signal, wherein the power strength signal is used for representing the transmitting power used by other network equipment;
comparing the attenuated power intensity signal with a preset interference threshold value;
and when the attenuated power intensity signal is smaller than the interference threshold value, sending a data frame.
In another aspect, an embodiment of the present invention further provides a device for data transmission, including an attenuator, a comparator, and a transmitter, where,
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 equipment;
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 when the power strength signal attenuated by the attenuator is smaller than the interference threshold value.
The method and the device for data transmission provided by the embodiment of the invention can attenuate the acquired power intensity signals of other devices on the same frequency channel before sending the data frame, wherein the power intensity signals of other devices are used for representing the transmitting power of the data frame sent by other devices. And if the attenuated power intensity signal is smaller than a preset interference threshold value, sending the data frame. Under the scene that the distance between the devices is far and the mutual interference is approximately ignored, a plurality of devices are allowed to simultaneously send data frames, the data transmission efficiency can be improved, and the transmission resources of the channel are fully utilized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method of data transmission according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating data transmission according to an embodiment of the present invention;
FIG. 3 is a flow chart of another method of data transmission according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating another example of data transmission according to the present invention;
FIG. 5 is a flow chart of another method of data transmission according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an apparatus for data transmission according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of another apparatus for data transmission according to an embodiment of the present invention;
fig. 8 is a diagram illustrating another example of data transmission according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a data transmission method, as shown in fig. 1, the method includes the following steps:
101. the first device attenuates the acquired power intensity signal.
The power strength signal is used for representing the size of the transmitting power used by other equipment for transmitting the data frame. The first device may be a network device including an AP, or a terminal side device including a workstation.
102. And the first equipment compares the attenuated power intensity signal with a preset interference threshold value.
When the attenuated power strength signal is greater than or equal to the preset interference threshold value, the first device considers that the data frame sent by other sender devices can influence the receiver device corresponding to the first device to correctly receive the data frame, so that the data frame is not sent. When the attenuated power strength signal is smaller than a preset interference threshold value, the first device considers that the data frame sent by other sender devices does not or approximately does not influence the correct data frame reception of the receiver device corresponding to the first device, so that the data frame is sent. For example, as shown in fig. 2, device 1 communicates with device 3 and device 2 communicates with device 4. Device 1, as a first device, needs to send data frame a to device 3 while device 2 is sending data frame B to device 4. Device 1 and device 2 transmit data frames using the same frequency channel. The device 1 attenuates the acquired power intensity signal of the data frame B transmitted by the device 2. When the attenuated power strength signal is greater than or equal to the preset interference threshold value, the device 1 considers that the data frame B sent by the device 2 will affect the device 3 to correctly receive the data frame a, so that the data frame is not sent. When the attenuated power strength signal is smaller than the preset interference threshold value, the device 1 considers that the data frame transmission of the device 2 does not or approximately does not influence the correct reception of the data frame a by the device 3, so that the data frame is transmitted.
It should be noted that the obtained power strength signal may be a transmission power size used by the first device when the other device obtained on the port sends the data frame. The other devices may be multiple devices, the first device attenuates the multiple power strength signals on the port, and when all the attenuated power strength signals are smaller than a preset interference threshold, the first device transmits a data frame.
103. And when the attenuated power intensity signal is smaller than an interference threshold value, the first equipment sends a data frame.
As also shown in fig. 2, when the comparison result is that the attenuated power strength signal is less than the interference threshold, device 1 may transmit data frame a to device 3 on the same frequency channel while device 2 is transmitting data frame B to device 4. For the frequency channel, the channel may be simultaneously transmitting data frames by two devices at a time. Since the device 3 is far away from the device 2, the effect of the device 2 sending the data frame B on the device 3 correctly receiving the data frame a can be ignored, and in the existing CSMA/CA mechanism, even if the effect of the device 2 sending the data frame B on the device 3 correctly receiving the data frame a is ignored, the device 1 cannot send the data frame a to the device 3 while the device 2 sends the data frame B to the device 4. Compared with the existing mechanism, the technical scheme provided by the embodiment of the invention doubles the channel utilization rate of the scene shown in FIG. 2. 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.
It should be noted that, in fig. 2, the device 1 does not decrease the actual transmission power value of the data frame B sent by the device 2, but attenuates the power intensity signal, which is acquired at the port of the device 1 and used for characterizing the transmission power of the device 2, in terms of "cognition" of the device 1 to the transmission power of the device 2, the transmission power value of the device 2 is attenuated. For a scenario that the distance between the device 2 and the device 3 is long and the interference is almost negligible, the device 1 may "think" that the interference of the device 2 to the device 1 is small in a manner of attenuating the power strength signal of the device 2, so that the device 2 can send the data frame B to the device 4 and send the data frame a to the device 3 at the same time, thereby improving the channel utilization rate.
In the embodiment of the present invention, since the devices perform interactive communication, the device on the receiving side may also transmit a data frame, and the device is the device on the transmitting side when transmitting the data frame. For example, the device 3 and the device 4 in fig. 2, and the implementation manner of the device 3 and the device 4 as sender devices to send data frames to the device 1 and the device 2 respectively is the same as the implementation manner of sending data frames by the device 1, and is not described here again.
The data transmission method provided by the embodiment of the invention can attenuate the acquired power intensity signals of other equipment on the same frequency channel before sending the data frame, wherein the power intensity signals of other equipment are used for representing the transmitting power of the data frame sent by other equipment. And if the attenuated power intensity signal is smaller than a preset interference threshold value, sending the data frame. Under the scene that the distance between the devices is far and the mutual interference is approximately ignored, a plurality of devices are allowed to simultaneously send data frames, the data transmission efficiency can be improved, and the transmission resources of the channel are fully utilized.
Further, an embodiment of the present invention further provides a method for data transmission, as shown in fig. 3, where the method is a further extension of the method shown in fig. 1, and the method includes:
301. the first device attenuates the acquired power intensity signal.
The power strength signal is used for representing the size of the transmitting power used by other equipment for transmitting the data frame. The first device may be a network device including an AP, or a terminal side device including a workstation.
In an application scenario of the embodiment of the present invention, due to the existence of the path loss, the power strength signal of the other device acquired by the first device is smaller than the actual transmission power of the other device. In the embodiment of the present invention, the power strength signal may also be used to characterize the magnitude of the transmission power passing through the path loss.
As also shown in fig. 2, the transmission power of the data frame B transmitted by the device 2 is 100 milliwatts (mW), and due to the effect of the wireless channel loss, the power intensity signal of the device 2 acquired by the device 1 at a certain distance is-75 decibels of milliwatts (dBm), which is converted to about 0.000000032 mW. For ease of calculation, the power strength signal is dBm.
The attenuation of the power intensity signal by the first device specifically includes: the first device attenuates the power intensity signal according to a preset signal attenuation value. The signal attenuation value can be set by a network administrator according to the needs of practical application, in the embodiment of the present invention, the signal attenuation value is illustrated by taking 25dBm as an example, and the signal attenuation value is not limited in practical application. As also shown in fig. 2, the transmission power of the data frame B transmitted by the device 2 is 20dBm, the power intensity signal of the device 2 acquired by the device 1 is-75 dBm, and the device 1 attenuates the power intensity signal of the device 2 to-100 dBm according to the preset signal attenuation value, that is, -75dBm-25dBm is-100 dBm.
302. And the first equipment compares the attenuated power intensity signal with a preset interference threshold value.
When the attenuated power strength signal is greater than or equal to the preset interference threshold value, the first device considers that other devices on the channel are transmitting data frames, and the transmitting power of the first device can influence the device to correctly transmit the data frames. When the attenuated power intensity signal is smaller than a preset interference threshold value, the first device considers that no other device on the channel is transmitting the data frame, and then the data frame is transmitted. The setting of the interference threshold value is related to the transmitting power of other devices, the distance between the devices and the property of the transmission medium. For example, an interference threshold for a device with a transmit power greater than 20dBm may be no greater than-80 dBm, an interference threshold for a device with a transmit power between 17dBm and 20dBm may be equal to-76 dBm, and an interference threshold for a device with a transmit power less than or equal to 17dBm may be equal to-70 dBm. The farther the distance between the devices is, the greater the path loss in the same transmission medium, so the interference threshold value is correspondingly smaller. The embodiment of the present invention is not limited to setting the interference threshold.
303. And when the attenuated power intensity signal is smaller than an interference threshold value, the first equipment sends a data frame.
For example, as also shown in fig. 2, device 1 communicates with device 3 and device 2 communicates with device 4. Device 1, as a first device, needs to send data frame a to device 3 while device 2 is sending data frame B to device 4. Device 1 and device 2 transmit data frames using the same frequency channel. Taking the power intensity signal of the device 2 measured by the device 1 as-75 dBm, the signal attenuation value as 25dBm, and the interference threshold value as-76 dBm as examples: in the current CSMA/CA mechanism, since the power strength signal is-75 dBm greater than the interference threshold value and-76 dBm, the device 1 "considers" that the device 2 is sending the data frame B, in order to avoid the device 1 and the device 2 from sending the data frame on the same channel at the same time to cause mutual interference, the device 1 will wait for the device 2 to send the data frame B, and after the device 2 has sent the data frame B, sequentially wait for a frame interval and a random back-off time, and then monitor whether there is another device in the channel sending the data frame again, if there is, continue waiting, and if not, send the data frame a. In the embodiment of the present invention, the device 1 attenuates the power strength signal of the device 2 by 25dBm, that is, attenuates the power strength signal from-75 dBm to-100 dBm, compares the attenuated power strength signal with an interference threshold value of-76 dBm, and the attenuated power strength signal is smaller than the interference threshold value, and the device 1 "considers" that the device 2 is not transmitting a data frame, so the device 1 can transmit a data frame a. In fact, device 1 is transmitting data frame B while device 2 is transmitting data frame a, except that the device considers from a "cognitive" perspective that device 2 is not transmitting data frame B. Since device 3 is located relatively far from device 2 in fig. 2, the transmit power of device 2 transmitting data frame B may be approximately negligible to device 3 correctly receiving data frame a.
Assuming that it takes 1ms (millisecond) to transmit each of the data frames a and B, the frame interval is 10ms, and the random backoff time is at least 2ms, in the CSMA/CA mechanism, it takes 14ms to transmit the data frames a and B (transmit data frame B1ms + frame interval 10ms + random backoff time 2ms + transmit data frame B1 ms). In the embodiment of the present invention, it takes at least 1ms (device 1 and device 2 transmit data frames simultaneously) to transmit data frames a and B, and at most 2ms (device 1 and device 2 transmit data frames sequentially). At least 12ms is saved compared with the existing mechanism.
304. And when the attenuated power intensity signal is greater than or equal to the interference threshold value, the first equipment attenuates the attenuated power intensity signal again.
In another application scenario of the embodiment of the present invention, the first device may attenuate the attenuated power intensity signal again according to a preset signal attenuation value. The embodiment of the invention does not limit the signal attenuation value. Specifically, as shown in fig. 2, the power strength signal of the device 2 is-55 dBm, the signal attenuation value is 10dBm, and the interference threshold value is-76 dBm: after the device 1 attenuates the power intensity signal of the device 2 according to the signal attenuation value, the attenuated power intensity signal is-65 dBm and still larger than the interference threshold value. At this time, the device 1 attenuates the attenuated power intensity signal again according to the signal attenuation value to obtain a re-attenuated power intensity signal of-75 dBm. Then, step 302 is repeatedly executed, the re-attenuated power strength signal is compared with a preset interference threshold, if the re-attenuated power strength signal is smaller than the preset interference threshold, the device 1 sends the data frame a, and if the re-attenuated power strength signal is still larger than or equal to the preset interference threshold, the device 1 repeatedly executes step 304 and step 302 until the power strength signal is attenuated to be smaller than the interference threshold, and then sends the data frame a. In this application scenario, device 1 repeats step 304 and step 302 for 2 times, attenuates the power intensity signal to-85 dBm, which is less than-76 dBm of the interference threshold, and then sends data frame a.
Further, in another application scenario of the embodiment of the present invention, a packet loss rate of the first device sending the data frame may also be monitored, where the packet loss rate is a ratio of the number of lost data frames in the data frame transmission to the number of transmission data frames. When the packet loss rate is greater than or equal to the preset packet loss rate threshold value, it indicates that other devices transmitting data frames on the same frequency channel may affect the receiving device of the first device to correctly receive the data frames. As shown in fig. 4, the device 1 needs to continuously transmit two data frames a and B while the device 2 transmits the data frame C, and after the data frame a is transmitted, the packet loss rate of the data frame a is monitored.
If the packet loss rate of the data frame a is less than or equal to the packet loss rate threshold, the device 1 may attenuate the power strength signal obtained when the data frame B is transmitted according to the original signal attenuation value.
If the packet loss rate of the data frame a is greater than the packet loss rate threshold, for example, greater than 10%, when the device 1 sends the data frame B, as shown in fig. 5, the following steps need to be performed:
501. the first device reduces the signal attenuation value.
The reduction of the signal attenuation value can be achieved in two ways:
1) and halving the signal attenuation value to form a new signal attenuation value. E.g., halved from 10dBm to 5dBm, thereby reducing the degree of attenuation.
2) And subtracting a 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.
Optionally, when the packet loss rate of the data frame a is greater than or equal to the packet loss rate threshold, the power strength signal when the data frame B is sent may not be attenuated.
502. And the first equipment attenuates the power intensity signal acquired again by using the reduced signal attenuation value.
503. And the first equipment monitors the packet loss rate of the data frame which is sent again.
If the packet loss rate of the data frame B is greater than the packet loss rate threshold, the step 501 is repeatedly executed, that is, the signal attenuation value is reduced again according to the two implementation manners of reducing the signal attenuation value in the step 501.
It should be noted that, the attenuation degree of the data frame B is reduced or the power strength signal when the data frame B is transmitted is not attenuated, and it is not guaranteed that the power strength signal when the data frame B is transmitted is certainly greater than or equal to the interference threshold, but the power strength signal when the data frame B is transmitted is reduced or not attenuated, so that the power strength signal approaches to be greater than or equal to the interference threshold. If the power strength signal when sending the data frame B is smaller than the interference threshold, it indicates that the device 2 is not sending the data frame C, and at this time, the device 1 may send the data frame B; if the power strength signal when transmitting data frame B is greater than or equal to the interference threshold, it indicates that device 2 is transmitting data frame C, and device 1 does not transmit data frame B at this time.
Further optionally, when the packet loss rate of the data frame a sent by the device 1 is greater than or equal to the packet loss rate threshold, the data frame a may also be sent again, and the way for sending the data frame B may be referred to for the data frame a to be sent again, which is not described again in this embodiment of the present invention.
The parameters that can be used for representing the correct reception of the data frame by the device in the embodiment of the present invention are not limited to the packet loss rate. For other parameters used for representing that the device correctly receives the data frame, the implementation manner is the same as that when the packet loss rate is used as the parameter, and details are not repeated here.
In the data transmission method provided by the embodiment of the present invention, before sending a data frame, the obtained power strength signals of other devices on the same frequency channel are attenuated, and the power strength signals of the other devices are used to represent the transmission power of the other devices for sending the data frame. And if the attenuated power intensity signal is smaller than a preset interference threshold value, sending the data frame. Under the scene that the distance between the devices is far and the mutual interference is approximately ignored, a plurality of devices are allowed to simultaneously send data frames, the data transmission efficiency can be improved, and the transmission resources of the channel are fully utilized.
In addition, the method for data transmission according to the embodiment of the present invention may further monitor a packet loss rate of the transmitted data frame, and when the packet loss rate is greater than a boundary value that can ensure correct transmission of the data frame, decrease or not attenuate the power strength signal in a process of subsequently transmitting the data frame, so as to preferentially ensure a transmission success rate of the data frame.
Referring to fig. 6, a data transmission device according to an embodiment of the present invention is provided to implement the methods shown in fig. 1 and fig. 3 of the present invention. The device 60 may be a network device including an AP, or a terminal side device including a workstation. As shown in fig. 6, the apparatus 60 comprises an attenuator 61, a comparator 62 and a transmitter 63, wherein,
the attenuator 61 is configured to attenuate the acquired power strength signal, where the power strength signal is used to characterize the transmission power used by other devices.
The comparator 62 is configured to compare the power intensity signal attenuated by the attenuator 61 with a preset interference threshold.
When the power strength signal attenuated by the attenuator 61 is greater than or equal to the preset interference threshold, it may be considered that there is another device on the channel transmitting a data frame, and the transmission power of the device may affect the device 60 to correctly transmit the data frame. When the power strength signal attenuated by the attenuator 61 is smaller than a preset interference threshold value, it may be considered that no other device is transmitting a data frame on the channel, and the device 60 may transmit a data frame. The setting of the interference threshold value is related to the transmitting power of other devices, the distance between the devices and the property of the transmission medium. For example, an interference threshold for a device with a transmit power greater than 20dBm may be no greater than-80 dBm, an interference threshold for a device with a transmit power between 17dBm and 20dBm may be equal to-76 dBm, and an interference threshold for a device with a transmit power less than or equal to 17dBm may be equal to-70 dBm. The farther the distance between the devices is, the greater the path loss in the same transmission medium, so the interference threshold value is correspondingly smaller. The embodiment of the present invention is not limited to setting the interference threshold.
The transmitter 63 is configured to transmit a data frame when the power strength signal attenuated by the attenuator 61 is smaller than the interference threshold value.
Further, the attenuator 61 is specifically configured to attenuate the power intensity signal according to a preset signal attenuation value.
The signal attenuation value can be set by a network administrator according to the needs of practical application, in the embodiment of the present invention, the signal attenuation value is illustrated by taking 25dBm as an example, and the signal attenuation value is not limited in practical application.
Further, when the power intensity signal attenuated by the attenuator 61 is greater than or equal to the interference threshold value, the attenuator 61 is further configured to attenuate the attenuated power intensity signal again according to the preset signal attenuation value.
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 transmitter 63 is further configured to transmit a data frame when the power strength signal attenuated again by the attenuator 61 is smaller than the interference threshold value.
Further, as shown in fig. 7, the apparatus 60 may further include a monitor 71 and a processor 72 for implementing the method of fig. 5 of the present invention.
The monitor 71 is configured to monitor a packet loss rate of the data frame sent by the sender 63.
The packet loss rate is the proportion of the number of lost data frames in the transmission of the data frames to the number of transmission data frames. When the packet loss rate is greater than or equal to the preset packet loss rate threshold, it indicates that the transmission of data frames by multiple devices on the same frequency channel will affect the correct reception of data frames by the device 60 on the receiving side.
When the packet loss rate monitored by the monitor 71 is greater than or equal to a preset packet loss rate threshold value:
the processor 72 is configured to halve the preset signal attenuation value, for example, from 10dBm to 5dBm, to form a new signal attenuation value; or, the method is configured to subtract a preset signal attenuation step from the preset signal attenuation value, for example, the original signal attenuation value is 10dBm, and the preset signal attenuation step is 2dBm, so as to form a new signal attenuation value.
It should be noted that, the processor 72 reduces the attenuation degree of the data frame B or does not attenuate the power strength signal when sending the data frame B, and does not ensure that the power strength signal when sending the data frame B is always greater than or equal to the interference threshold, but reduces or does not attenuate the power strength signal when sending the data frame B, so that the power strength signal approaches to be greater than or equal to the interference threshold. And determining whether to send the data frame B according to whether the power strength signal is smaller than the interference threshold is an implementation manner in the prior art.
Further, the device may further include a radio frequency link device, where the radio frequency link device is configured to obtain a power strength signal of another device. The radio frequency link means may be connected to the attenuator 61.
Alternatively, the rf receiving chain device may also include the attenuator 61, the comparator 62 and the transmitter 63.
The device for data transmission provided in the embodiment of the present invention includes, but is not limited to, an Access Point (AP) and a workstation (Station) in a WLAN, and devices or devices having a wireless data transmission function in other application scenarios also belong to the device described in the embodiment of the present invention, and are not enumerated here one by one. In addition, the data transmission device in the embodiment of the invention has the sending function and the receiving function in the method embodiment at the same time, so as to ensure that interactive communication can be carried out between the devices in practical application.
In an application scenario of the embodiment of the present invention, an AP and a Station perform wireless data interaction in a half-duplex mode, both the AP and the Station can serve as a data frame to be sent, and when one of the AP and the Station serves as a sender device, the other serves as a receiver device. As shown in fig. 8, the AP1 can only interact with data in the Station1, the AP2 can only interact with data in the Station2, and the AP1, the Station1, the AP2, and the Station2 interact with data in the same frequency channel. When AP1 is transmitting data frame a to Station1, the interference of AP1 transmit power to Station2 receiving AP2 transmitting data frame B is approximately negligible, since AP1 is far away from Station 2. Therefore, at this time, although the power strength signal of the AP1 obtained by the AP2 is higher than the interference threshold, the AP2 may attenuate the power strength signal of the AP1 to be smaller than the interference threshold, so that the AP2 may send the data frame B to the Station2 while the AP1 sends the data frame a, thereby enabling two or more devices on the same frequency channel to send data frames at the same time, and saving network resources. The implementation manner of the Station as the sending device sending the data frame to the AP is the same as the manner of sending the data frame by the AP, and is not described herein again.
The method and the device for data transmission provided by the embodiment of the invention can be suitable for various communication systems, and the systems comprise: wideband Code Division Multiple Access (WCDMA) System, Long Term Evolution (LTE) System, Global System for Mobile Communications (GSM) System, and the like.
By adopting the technical scheme provided by the embodiment of the invention, the acquired power intensity signals of other equipment on the same frequency channel can be attenuated before the data frame is sent. And if the attenuated power intensity signal is smaller than a preset interference threshold value, sending the data frame. Therefore, under the scene that the distance between the equipment is far and the mutual interference is approximately ignored, a plurality of pieces of equipment are allowed to simultaneously send the data frame, the data transmission efficiency can be improved, and the transmission resource of the channel is fully utilized. Meanwhile, by monitoring the packet loss rate of the transmitted data frame, when the packet loss rate is greater than the boundary value which can ensure correct transmission of the data frame, the power intensity signal is reduced or not attenuated in the process of transmitting the data frame subsequently, and the transmission success rate of the data frame can be ensured.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus necessary general hardware, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be substantially implemented or a part of the technical solutions contributing to the prior art may be embodied in the form of a software product, which is stored in a readable storage medium, such as a floppy disk, a hard disk, or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or an apparatus) to execute the methods according to the embodiments of the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method of data transmission, comprising:
attenuating the obtained power strength signal, wherein the power strength signal is used for representing the transmitting power used by other network equipment;
comparing the attenuated power intensity signal with a preset interference threshold value;
and when the attenuated power intensity signal is smaller than the interference threshold value, sending a data frame.
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, sending a data frame.
4. The method of claim 2 or 3, wherein after the sending the data frame, 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 equipment;
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 when the power strength signal attenuated by the attenuator is smaller than the interference threshold value.
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 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210053629.3A CN102624483B (en) | 2012-03-02 | 2012-03-02 | Method and device for data transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210053629.3A CN102624483B (en) | 2012-03-02 | 2012-03-02 | Method and device for data transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102624483A true CN102624483A (en) | 2012-08-01 |
| CN102624483B CN102624483B (en) | 2014-12-03 |
Family
ID=46564178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210053629.3A Active CN102624483B (en) | 2012-03-02 | 2012-03-02 | Method and device for data transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102624483B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109981157A (en) * | 2019-03-01 | 2019-07-05 | 维沃移动通信有限公司 | A kind of radio frequency link control method and terminal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1885743A (en) * | 2005-06-23 | 2006-12-27 | 华为技术有限公司 | Method for optimizing power deviation between PRACH lead and message |
| CN101238744A (en) * | 2005-06-10 | 2008-08-06 | 松下电器产业株式会社 | Wireless communication apparatus and wireless communication method |
| CN101421990A (en) * | 2006-04-13 | 2009-04-29 | 高通股份有限公司 | Dynamic carrier sensing thresholds |
| WO2009127690A1 (en) * | 2008-04-18 | 2009-10-22 | Telefonaktiebolaget L M Ericsson (Publ) | Adaptive coexistence between different wireless communication systems |
| WO2010022156A2 (en) * | 2008-08-19 | 2010-02-25 | Shared Spectrum Company | Method and system for dynamic spectrum access using specialty detectors and improved networking |
-
2012
- 2012-03-02 CN CN201210053629.3A patent/CN102624483B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101238744A (en) * | 2005-06-10 | 2008-08-06 | 松下电器产业株式会社 | Wireless communication apparatus and wireless communication method |
| CN1885743A (en) * | 2005-06-23 | 2006-12-27 | 华为技术有限公司 | Method for optimizing power deviation between PRACH lead and message |
| CN101421990A (en) * | 2006-04-13 | 2009-04-29 | 高通股份有限公司 | Dynamic carrier sensing thresholds |
| WO2009127690A1 (en) * | 2008-04-18 | 2009-10-22 | Telefonaktiebolaget L M Ericsson (Publ) | Adaptive coexistence between different wireless communication systems |
| WO2010022156A2 (en) * | 2008-08-19 | 2010-02-25 | Shared Spectrum Company | Method and system for dynamic spectrum access using specialty detectors and improved networking |
Non-Patent Citations (2)
| Title |
|---|
| TAO YANG: "Connectivity of Wireless CSMA Multi-Hop Networks", 《2011 IEEE INTERNATIONAL CONFERENCE ON ICC》, 9 June 2011 (2011-06-09) * |
| 严少虎: "IEEE802.11DCF中基于能耗最小的RTS门限自适应调整算法", 《电子与信息学报》, vol. 27, no. 12, 31 December 2005 (2005-12-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109981157A (en) * | 2019-03-01 | 2019-07-05 | 维沃移动通信有限公司 | A kind of radio frequency link control method and terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102624483B (en) | 2014-12-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9826423B2 (en) | Systems and methods for LTE and WLAN coexistence | |
| US8666319B2 (en) | Mitigating effects of identified interference with adaptive CCA threshold | |
| CN114223172B (en) | Position assisted cross link interference measurement | |
| CN113826344B (en) | Efficient transmit mode support | |
| CN104066196B (en) | Determine the method and apparatus for drawing and selecting radio frequency unit RRU | |
| US11172499B2 (en) | Information transmission method, apparatus, and system | |
| CN110167203B (en) | Beam failure recovery method and device | |
| US12082248B2 (en) | Channel sensing techniques for wireless networks | |
| US10044490B2 (en) | Adjacent channel interference cancellation in multi-channel systems | |
| CN115699599A (en) | Multi-panel power reporting techniques | |
| US20180213594A1 (en) | Measurement result reporting method, method for counting by timer, apparatus, and user equipment | |
| CN105873072A (en) | Carrier aggregation control method and device of mobile terminal and mobile terminal | |
| US20160249226A1 (en) | Wireless communication method and apparatus | |
| CN114071479B (en) | Method and terminal for setting data transmission type | |
| US11128544B2 (en) | Remote wireless sniffer management | |
| WO2016037471A1 (en) | Method, device and system for processing occupation of unlicensed carrier | |
| US20240031092A1 (en) | Terminal device and network device | |
| CN102624483B (en) | Method and device for data transmission | |
| CN103458458B (en) | Carrier wave measuring method and device | |
| EP3448095A1 (en) | Terminal device and communication method | |
| US12068795B2 (en) | Excessive interference indication | |
| WO2016146014A1 (en) | Frequency adjustment method and apparatus applied to mobile communications | |
| WO2012151862A1 (en) | Method and communication terminal for implementing mixed communication based on carrier aggregation technology | |
| CN118476310A (en) | Random access configuration associated with cross-link interference | |
| CN110944346A (en) | Signal sending method and equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |