CN113099544B - Data transmission method, device, storage medium and wireless node - Google Patents

Abstract

The embodiment of the application discloses a data transmission method, a data transmission device, a storage medium and a wireless node, and belongs to the field of wireless communication. The second wireless node receives data sent by the first wireless node in the TXOP transmission opportunity period; wherein the first wireless node is a holder of the TXOP; when the second wireless node has data to be sent to the first wireless node, the second wireless node determines a time t1 at which the first wireless node completes data sending in the TXOP period; the second wireless node transmitting data to the first wireless node according to time t 2; the time interval between the time t2 and the time t1 is the SIFS minimum inter-frame space, and when the first wireless node finishes sending data to the second wireless node, the second wireless node directly sends the data to the first wireless node without performing channel competition, so that the time delay of data transmission can be reduced.

Description

Data transmission method, device, storage medium and wireless node

technical field

The present application relates to the field of wireless communication, and in particular, to a data transmission method, device, storage medium and wireless node.

Background technique

The 802.11 protocol stipulates that a station (station, STA for short) obtains the right to use the channel through channel competition, and the station that successfully competes for the right to use the channel sends an RTS (require to send, request to send) frame to apply for a TXOP (transmit opportunity, transmission). Opportunity) period, the station is also called the holder of the TXOP period (TXOP holder) and then the station sends data within the TXOP period, and after the data transmission is completed, it sends a CF-END (contention-free periodend, no contention period end) frame to indicate TXOP Cycle ends. After the TXOP period ends, all stations wait for at least one DIFS (DCF interframe space, distributed coordination function interframe space) to re-execute the contention for the channel, and execute the next data transmission after successfully contending for the channel.

SUMMARY OF THE INVENTION

The data transmission method, device, storage medium, and wireless node provided by the embodiments of the present application can solve the problem of relatively large data transmission delay in the related art. The technical solution is as follows:

In a first aspect, an embodiment of the present application provides a data transmission method, the method comprising:

The second wireless node receives the data sent by the first wireless node within the TXOP period; wherein, the first wireless node is the holder of the TXOP;

When the second wireless node has data to be sent to the first wireless node, the second wireless node determines the time t1 at which the first wireless node completes data sending within the TXOP period;

The second wireless node sends data to the first wireless node according to the time t2; wherein, the time interval between the time t2 and the time t1 is the SIFS minimum inter-frame interval.

In a second aspect, an embodiment of the present application provides a data transmission device, and the data transmission device includes:

a transceiver unit, configured to receive data sent by a first wireless node within a TXOP period; wherein, the first wireless node is the holder of the TXOP;

a processing unit, configured to, when there is data to be sent to the first wireless node, determine the time t1 at which the first wireless node completes data sending within the TXOP period;

The transceiver unit is further configured to send data to the first wireless node according to the time t2; wherein, the time interval between the time t2 and the time t1 is the minimum inter-frame interval of the SIFS.

In a third aspect, an embodiment of the present application provides a computer storage medium, where the computer storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the above method steps.

In a fourth aspect, an embodiment of the present application provides a wireless node, which may include: a processor and a memory; wherein, the memory stores a computer program, and the computer program is adapted to be loaded by the processor and execute the above method steps .

The beneficial effects brought by the technical solutions provided by some embodiments of the present application include at least:

The second wireless node receives the data sent from the first wireless node within the TXOP period, the second wireless node determines the data to be sent to the first wireless node before the end of the TXOP period, and the second wireless node completes the data transmission at the first wireless node After sending, there is no need to perform channel competition, and the second wireless node is directly switched from the receiver to the sender to send data to the first wireless node. The present application achieves the purpose of reducing data transmission delay by reducing the time for channel competition.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is an architectural diagram of a wireless communication system provided by an embodiment of the present application;

Fig. 2 is the sequence diagram of data transmission in the related art;

3 is another schematic flowchart of a data transmission method provided by an embodiment of the present application;

4 to 6 are sequence diagrams of data transmission provided by embodiments of the present application;

7 is a schematic structural diagram of a data transmission device provided by the present application;

FIG. 8 is a schematic structural diagram of a wireless node provided by the present application.

Detailed ways

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

Referring to FIG. 1, FIG. 1 is a network architecture diagram of a wireless communication system. A wireless communication system includes at least one station and at least one access point (AP for short). For example, the wireless fidelity communication system includes: STA1, STA2, STA3 and AP. Before the station establishes a connection with any access point, the station selects a frequency point to connect to the access point through passive scanning or active scanning. The frequency point is the center frequency of the frequency range. One frequency point corresponds to one channel. The access point establishes the connection. When the station establishes a communication connection with the access point, the station triggers periodic full-channel scanning according to the application or framework triggers. The station performs full-channel scanning according to the full-channel set. The full-channel set includes multiple channels. The full-channel set is related to the support capability of the terminal and the region. For example, the terminal supports 2.4G and 5G wireless fidelity channels. When the terminal is powered on, it reads the area code from the subscriber identification module (SIM) and reads the communication capability information from the local memory to obtain the area. The full channel set associated with the code and the communication capability information, the full channel set includes 14 2.4G wireless fidelity channels and 24 5G wireless fidelity channels, the 2.4 GHz wireless fidelity channel has 13 channels, and the 13 channels are distributed The situation is shown in Table 1:

Table 1

The stations compete for the right to use the channel by means of channel competition, and then perform data transmission on the channel within a preset time period. Referring to Figure 2, after STA1 competes for the right to use the channel based on the EDCA (enhanced distributed channel access) mechanism, it can send data within the TXOP period. The TXOP period is a time interval. The duration may be determined according to actual requirements. Since STA3 does not compete for the channel, the value of NAV (network allocation vector, network allocation vector) is non-zero. Before STA1 sends data to STA2, STA1 sends an RTS (require to send) frame to STA2. When STA2 is ready to receive data, it returns a CTS (clear to send) frame to STA1, and STA1 receives the data from STA2. After receiving the CTS frame, it can send a DATA (data) frame to STA2. After STA2 successfully receives the DATA frame, it returns an ACK frame to STA1; at the end of the TXOP period, STA1 broadcasts a CF-END frame, and each station receives the CF-END frame. After the frame, the value of NAV becomes 0, and after waiting for DIFS, the EDCA mechanism is executed to compete for the channel. It can be seen that in the related art, two adjacent data transmission processes are separated by at least one DIFS, so the transmission delay is relatively large.

The embodiment of the present application provides a data transmission method, and the data transmission method can be applied to a wireless node, and the wireless node of the present application can be a station, an access point or a relay node (having the functions of a station and an access point). The wireless node may be a router, a relay amplifier, a smart phone, a tablet computer, a game device, an AR (Augmented Reality, augmented reality) device, a car, a data storage device, an audio playback device, a video playback device, a notebook, and a desktop computing device. , Wearable devices such as electronic watches, electronic glasses, electronic helmets, electronic bracelets, electronic necklaces, electronic clothing and other devices.

The data transmission method provided by the embodiment of the present application will be described in detail below with reference to FIG. 2 to FIG. 3 . The apparatus for executing the data transmission method in the embodiment of the present application may be the wireless node shown in FIG. 1 .

Referring to FIG. 3 , a schematic flowchart of a data transmission method is provided in an embodiment of the present application. As shown in FIG. 3 , the method of the embodiment of the present application may include the following steps:

S301. The second wireless node receives data sent by the first wireless node within the TXOP period.

The first wireless node is the holder of the TXOP period. Before the first wireless node sends data to the second wireless node, the first wireless node performs channel competition based on a channel competition mechanism. The channel competition mechanism may be DCF (distributed coordination function). , distributed coordination function) or EDCA (enhanced distributed channel access, enhanced distributed channel access), after the first wireless node competes for the right to use the channel, it sends data to the second wireless node within the TXOP period, and the TXOP period is a time In the interval, the first wireless node has the right to use the channel in the TXOP period. At this time, the first wireless node is also called the holder of the TXOP period, and other wireless nodes except the first wireless node cannot send data in the TXOP. .

The process that the first wireless node sends data within the TXOP period may include: the first wireless node sends an RTS (require to send, request to send) frame to the second wireless node, where the RTS frame is used to request the second wireless node (receiver) , the second wireless node detects whether it is ready to receive data after receiving the RTS frame, and when the second wireless node determines that it is ready to receive data from the first wireless node, it sends a CTS (clear to send, clear to send) to the first wireless node ) frame, after receiving the CTS frame from the second wireless node, the first wireless node sends one or more DATA frames to the first wireless node, where the DATA frames are used to carry service data. The minimum time interval between two adjacent frames in the TXOP period is called SIFS (short interframe space, minimum interframe space).

S302. When the second wireless node has data to be sent to the first wireless node, the second wireless node determines the time t1 at which the first wireless node completes data sending within the TXOP period.

The second wireless node determines that there is data to be sent to the first wireless node before the end of the TXOP period. For example, the second wireless node determines at a certain time in the TXOP period that it needs to send data to the first wireless node, and the The second wireless node stores the data to be sent in the cache. The second wireless node determines the end time t1 at which the first wireless node completes data transmission within the TXOP period. When the first wireless node has the capability to send the CF-END frame, the second wireless node may use the end time of the CF-END frame as time t1. When the first wireless node does not have the ability to send a CF-END frame, when the second wireless node receives a DATA frame from the first wireless node, it parses the value of the transmission end indicator in the DATA frame, and the value is the first value when , it is determined that the first wireless node completes the data transmission, and then the DATA frame is sent to the ACK frame, and the end time of the ACK frame is taken as time t1.

In a possible implementation manner, the second wireless node determines the time t1 at which the first wireless node completes data transmission within the TXOP period, including:

When the second wireless node receives the CF-END contention-free period end frame from the first wireless node, it is determined that the first wireless node completes the transmission of data;

The end time of the CF-END frame is taken as the time t1.

For example, as shown in Figure 4 and Figure 5, STA1 sends a CF-END (contention-free period end, contention-free period end) frame by broadcasting when the TXOP period it holds ends, indicating that the TXOP period ends, and each Stations are free to contend for the channel again. When STA2 receives the CF-END frame from STA1, it is determined that STA1 completes the transmission of data within the TXOP cycle, the CF-END frame has a start time and an end time, and the end time of the CF-END frame coincides with the end time of the TXOP cycle. In this embodiment, the end time of the CF-END frame is taken as time t1.

In a possible implementation manner, the second wireless node determines the time t1 at which the first wireless node completes data transmission within the TXOP period, including:

receiving, by the second wireless node, a DATA frame sent by the first wireless node within the TXOP period;

When the transmission end indicator in the DATA frame is the first value, determining that the first wireless node completes the sending of data;

sending, by the second wireless node, an ACK confirmation frame corresponding to the DATA frame to the first wireless node;

The end time of the ACK frame is taken as the time t1.

For example: as shown in Figure 6, the transmission end indicator carried in the DATA frame is MD, the first value is 0, STA2 receives the DATA frame from STA1 within the TXOP period, and parses the transmission end indicator MD carried in the DATA frame. value, when MD=0, it is determined that STA1 completes data transmission within the TXOP period. When STA2 successfully receives the DATA frame, it returns the ACK frame associated with the DATA frame to STA1. The ACK frame has a start time and an end time. The application takes the end time of the ACK frame as time t1. It is easy to understand that the time t1 may be before the end time of the TXOP cycle, then STA2 may send data to STA1 during the TXOP cycle, so the existing TXOP cycle can be used to send data to improve the utilization of the TXOP cycle, thereby further data transmission. delay and improve the reliability of data transmission.

S303. The second wireless node sends data to the first wireless node according to time t2.

The second wireless node does not perform the channel competition process, and directly sends one or more DATA frames to the first wireless node according to time t2, the time interval between time t1 and time t2 is SIFS, and the length of SIFS is smaller than DIFS, Therefore, for other wireless nodes other than the second wireless node that have a transmission requirement, it will be detected that the channel is in a busy state and cannot successfully compete for the channel until the second wireless node completes the data transmission process.

In one or more possible embodiments, the second wireless node sends data to the first wireless node according to time t2, including:

The second wireless node sends a DATA frame to the first wireless node with time t2 as a starting time.

For example, as shown in FIG. 4 , STA2 sends a DATA frame to STA1 with time t2 as the starting time, and does not need to perform a channel contention process. After STA1 successfully receives the DATA frame from STA2, it sends an ACK frame to STA2.

In one or more possible embodiments, the second wireless node sends data to the first wireless node according to time t2, including:

The second wireless node sends an RTS request to send a frame to the first wireless node with time t2 as a starting time;

The second wireless node sends a DATA frame to the first wireless node when receiving the CTS frame returned by the first wireless node in response to the RTS frame.

For example, as shown in Figure 5, STA2 sends an RTS frame to STA1 with time t2 as the starting time. The RTS frame is used to request to send data to STA1. When STA1 is ready to receive data, it returns a CTS frame to STA2, and STA2 receives the data. When the CTS frame from STA1 arrives, it is determined that the STA is ready to receive data, and then STA2 sends a DATA frame to STA1. When STA1 successfully receives the DATA frame from STA2, it returns an ACK frame to STA2. STA2 can respond to multiple data in one ACK frame. The receiving status of the DATA frame is fed back. In this embodiment, STA2 does not perform channel competition after determining that STA1 completes data transmission, and only sends data to STA1 after performing the RTS/CTS process. The success rate of data transmission.

In one or more embodiments, time t2=time of the ACK frame+SIFS, that is, the second wireless node waits for the SIFS when the ACK frame is sent, and then sends data to the first wireless node.

Another example: as shown in FIG. 6 , STA2 receives a DATA frame from STA1 in the TXOP period, and after parsing the DATA frame, it is determined that the transmission end indicator MD=0, so it is determined that the DATA frame is the last DATA frame sent by STA1, and STA2 Return the ACK frame of the DATA frame to STA1, indicating that STA2 successfully received the last DATA frame of STA1, and then STA2 sends a DATA frame to STA1 after the time of the ACK frame + SIFS, STA2 converts to the sender, STA1 converts to the receiver, STA2 There is no need to perform the channel contention process, so the delay of data transmission can be reduced. It can be understood that if STA1 sends the last DATA frame earlier, STA2 may send a DATA frame to STA1 before the TXOP period of STA1 ends, which can make full use of the TXOP period held by STA1 and improve channel utilization.

Further, the data transmission method further includes:

When the second wireless node does not receive an ACK acknowledgment frame corresponding to the DATA frame from the first wireless node within a preset time period, obtain the number of retransmissions of the DATA frame;

When the number of retransmissions is less than the preset number of times, the second wireless node retransmits the DATA frame to the first wireless node; when the number of retransmission times is equal to the preset number of times, output sending failure prompt information.

The second wireless node is provided with a counter, which is used to count the number of times of sending each DATA frame, and the preset duration may be determined according to actual needs, which is not limited in this application. After sending the DATA frame to the first wireless node, the second wireless node starts a timer for timing, and when the timer reaches the preset time and still does not receive the ACK frame returned by the first wireless node, it is determined that the DATA frame transmission failed, Then, the count value of the current counter is obtained, and when the count value is less than a preset number of times, for example, the preset number of times is 3, the DATA frame is retransmitted to the first wireless node, and if it is equal to the preset number of times, a sending failure prompt message is output.

Implementing the embodiment of the present application, the second wireless node receives data sent from the first wireless node within the TXOP period, the second wireless node determines the data to be sent to the first wireless node before the end of the TXOP period, and the second wireless node is in the TXOP period. After the first wireless node completes the transmission of data, there is no need to perform channel competition, and the second wireless node is directly switched from the receiver to the sender to send data to the first wireless node. In this application, the time for channel competition is reduced, thereby reducing the time required for data transmission. purpose of extension.

The following are apparatus embodiments of the present application, which can be used to execute the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

Please refer to FIG. 7 , which shows a schematic structural diagram of a data transmission apparatus provided by an exemplary embodiment of the present application. The apparatus can be implemented as all or a part of the wireless node through software, hardware or a combination of the two. The data transmission device 7 (hereinafter referred to as the device 7 ) includes a transceiver unit 701 and a processing unit 702 .

A transceiver unit 701, configured to receive data sent by a first wireless node within a TXOP period; wherein, the first wireless node is the holder of the TXOP;

A processing unit 702, configured to, when there is data to be sent to the first wireless node, determine the time t1 at which the first wireless node completes data sending within the TXOP period;

The transceiver unit 701 is further configured to send data to the first wireless node according to time t2; wherein, the time interval between time t2 and time t1 is the minimum inter-frame interval of SIFS.

In one or more possible embodiments, the determining the time t1 at which the first wireless node completes data transmission within the TXOP period includes:

When receiving the CF-END contention-free period end frame from the first wireless node, determine that the first wireless node completes the transmission of data;

The end time of the CF-END frame is taken as the time t1.

In one or more possible embodiments, the determining the time t1 at which the first wireless node completes data transmission within the TXOP period includes:

receiving the DATA frame sent by the first wireless node within the TXOP period;

When the transmission end indicator in the DATA frame is the first value, determining that the first wireless node completes the sending of data;

sending an ACK confirmation frame corresponding to the DATA frame to the first wireless node;

The end time of the ACK frame is taken as the time t1.

In one or more possible embodiments, sending data to the first wireless node according to time t2 includes:

Sending a DATA frame to the first wireless node with time t2 as a starting time.

In one or more possible embodiments, the second wireless node sends data to the first wireless node according to time t2, including:

Sending an RTS request to send a frame to the first wireless node with time t2 as the starting time;

When receiving the CTS frame returned by the first wireless node in response to the RTS frame, send a DATA frame to the first wireless node.

In one or more possible embodiments,

The processing unit 702 is further configured to acquire the number of retransmissions of the DATA frame when the ACK confirmation frame corresponding to the DATA frame from the first wireless node is not received within a preset duration;

The transceiver unit 701 is further configured to retransmit the DATA frame to the first wireless node when the number of retransmissions is less than the preset number of times.

In one or more possible embodiments, the processing unit 702 is further configured to:

When the number of retransmissions is equal to the preset number of times, output sending failure prompt information.

It should be noted that when the device 7 provided in the above embodiment executes the data transmission method, only the division of the above functional modules is used as an example for illustration. In practical applications, the above functions can be allocated to different functional modules as required. That is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the data transmission apparatus and the data transmission method embodiments provided by the above embodiments belong to the same concept, and the implementation process of the data transmission apparatus is described in the method embodiments, which will not be repeated here.

The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

An embodiment of the present application further provides a computer storage medium, where the computer storage medium can store multiple instructions, and the instructions are suitable for being loaded by a processor and executing the method steps of the embodiments shown in FIG. 3 to FIG. 6 above. , and the specific execution process may refer to the specific description of the embodiments shown in FIG. 3 to FIG. 6 , which will not be repeated here.

The present application also provides a computer program product, where the computer program product stores at least one instruction, and the at least one instruction is loaded and executed by the processor to implement the data transmission method described in each of the above embodiments.

Referring to FIG. 8 , it shows a schematic structural diagram of a wireless node involved in an embodiment of the present application, and the wireless node 9 may be used to implement the data transmission method provided in the foregoing embodiment. Specifically:

The wireless node 9 includes a memory 920, a processor 980 and a WiFi module 970, which is the wireless module of the present application.

The memory 920 can be used to store software programs and modules, and the processor 980 executes various functional applications and data processing by running the software programs and modules stored in the memory 920 . The memory 920 may mainly include a stored program area and a stored data area, wherein the stored program area may store an operating system, an application program required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; The use of wireless nodes creates data (such as audio data, phonebooks, etc.), and the like. Additionally, memory 920 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 920 may also include a memory controller to provide access to the memory 920 by the processor 980 and the input unit 930 .

The processor 980 is the control center of the wireless node, and uses various interfaces and lines to connect various parts of the entire wireless node, by running or executing software programs and/or modules stored in the memory 920, and using the data stored in the memory 920. , perform various functions of the wireless node and process data, so as to monitor the wireless node as a whole. Optionally, the processor 980 may include one or more processing cores; wherein, the processor 980 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, etc. The modem processor mainly handles wireless communication. It can be understood that, the above-mentioned modulation and demodulation processor may not be integrated into the processor 980.

WiFi is a short-distance wireless transmission technology. The wireless node can help users to send and receive emails, browse web pages, and access streaming media through the WiFi module 970, which provides users with wireless broadband Internet access.

Specifically in this embodiment, the wireless node 9 includes a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by one or more processors to execute the one or more programs The program includes a method for performing the data transmission described in FIGS. 2 to 7 .

The embodiments of the present application and the method embodiments in FIGS. 3 to 6 are based on the same concept, and bring about the same technical effects. For specific processes, refer to the method embodiments of the method in FIGS. 2 to 3 , which will not be repeated here.

Optionally, the wireless node 9 further includes a display unit 940 . The display unit 940 may be used to display information input by the user or information provided to the user and various graphical user interfaces of the wireless node, which may be composed of graphics, text, icons, videos, and any combination thereof. The display unit 940 may include a display panel 941. Optionally, the display panel 941 may be configured in the form of an LCD (Liquid Crystal Display, liquid crystal display), an OLED (Organic Light-Emitting Diode, organic light-emitting diode), and the like. Further, the touch device 931 can cover the display panel 941, and when the touch device 931 detects a touch operation on or near it, it transmits it to the processor 980 to determine the type of the touch event, and then the processor 980 selects the type of the touch event according to the type of the touch event. Corresponding visual outputs are provided on display panel 941 . Although in FIG. 8, the touch device 931 and the display panel 941 are used as two independent components to realize the input and input functions, in some embodiments, the touch device 931 and the display panel 941 can be integrated to realize the input and output Function.

Optionally, the wireless node 9 further includes: an input unit 930 . The input unit 930 may be used to receive input numerical or character information, and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control. Specifically, the input unit 930 may include a touch device 931 (eg, a touch screen, a touch pad, or a touch frame). The touch device 931, also known as a touch display or a touchpad, collects the user's touch operations on or near it (such as the user using a finger, a stylus, or any suitable object or accessory on the touch device 931 or on the touch device). operation near 931), and drive the corresponding connection device according to the preset program. Optionally, the touch device 931 may include two parts, a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and then sends it to the touch controller. To the processor 980, and can receive the command sent by the processor 980 and execute it. In addition, the touch device 931 may be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves.

Optionally, the wireless node may include an RF (Radio Frequency, radio frequency) circuit 910, a memory 920 including one or more computer-readable storage media, an input unit 930, a display unit 940, a sensor 950, an audio circuit 960, WiFi ( A wireless fidelity (wireless fidelity) module 960, a processor 980 including one or more processing cores, a power supply 990 and other components. Those skilled in the art can understand that the wireless node structure shown in FIG. 8 does not constitute a limitation on the wireless node, and may include more or less components than shown, or combine some components, or arrange different components.

in:

The RF circuit 910 can be used for receiving and sending signals during transmission and reception of information or during a call. In particular, after receiving the downlink information of the base station, it is handed over to one or more processors 980 for processing; in addition, it sends the uplink data to the base station. . Typically, the RF circuit 910 includes, but is not limited to, an antenna, at least one amplifier, a tuner, one or more oscillators, a Subscriber Identity Module (SIM) card, a transceiver, a coupler, an LNA (Low Noise Amplifier) , duplexer, etc. In addition, RF circuitry 910 may communicate with networks and other devices via wireless communications. The wireless communication can use any communication standard or protocol, including but not limited to 3GPP (3rd Generation Partnership Project, 3rd Generation Partnership Project, 3GPP for short), 3GPP2 ((3rd Generation Partnership Project 2, 3rd Generation Partnership Project) 2, referred to as 3GPP2)), UMTS (Universal Mobile Telecommunications System, referred to as UMTS), LTE (Long Term Evolution, long term evolution, referred to as LTE), LTE-A (LTE-Advanced, long term evolution upgrade, referred to as LTE-A), WIMAX ((Worldwide Interoperability for Microwave Access, WIMAX for short), HSDPA (High Speed Downlink Packet Access, HSDPA for short), HSUPA (High Speed Uplink Packet Access, high speed uplink) Packet access, referred to as HSUPA), TDMA (Time Division Multiple Access, referred to as TDMA), WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access, referred to as WCDMA), GSM (Global System for Mobile Communication, Global System for Mobile Communications, referred to as GSM, e-mail, SMS (Short Messaging Service, short message service) and so on.

Optionally, the wireless node 9 may further include at least one sensor 950, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 941 according to the brightness of the ambient light, and the proximity sensor may turn off the display panel 941 and the proximity sensor when the wireless node moves to the ear. / or backlight. As a kind of motion sensor, the gravitational acceleration sensor can detect the magnitude of acceleration in all directions (usually three axes), and can detect the magnitude and direction of gravity when stationary, and can be used for applications that identify the posture of wireless nodes (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc. that can be configured on wireless nodes, here No longer.

The audio circuit 960, the speaker 961, and the microphone 962 can provide an audio interface between the user and the terminal device. The audio circuit 960 can convert the received audio data into an electrical signal, and transmit it to the speaker 961, and the speaker 961 converts it into a sound signal for output; on the other hand, the microphone 962 converts the collected sound signal into an electrical signal, which is converted by the audio circuit 960 After receiving, it is converted into audio data, and then the audio data is output to the processor 980 for processing, and then sent to, for example, another terminal device through the RF circuit 910, or the audio data is output to the memory 920 for further processing. The audio circuit 960 may also include an earplug jack to provide communication between the peripheral headset and the terminal device.

Optionally, the wireless node 9 further includes a power supply 990 (such as a battery) for supplying power to various components, wherein the power supply can be logically connected to the processor 980 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. management and other functions. Power supply 990 may also include one or more DC or AC power sources, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and any other components.

Optionally, the wireless node 9 may also include a camera 991, a Bluetooth module, etc., wherein the camera 991 is used to expose the surrounding environment to obtain a frame image. In one way, the camera 991 transmits the parameters of the frame image obtained by exposure. The processor 980 is given to the processor 980 to perform denoising, enhancement and other processing on the frame image to generate a picture that can be displayed to the user; in another optional solution, the camera 991 comes with an image processor chip , the image processing chip can perform preliminary processing on the frame image, and after performing the preliminary processing on the frame image, transmit the processed data to the processor 980 so that the processor 980 can finally produce an image that can be displayed to the user. Further, the number of the camera 991 may be one or multiple.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. During execution, the processes of the embodiments of the above-mentioned methods may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM) or the like.

What is disclosed above is only a preferred embodiment of the present application, and of course, it cannot limit the scope of the right of the present application. Those skilled in the art can understand that all or part of the process of implementing the above-mentioned embodiment can be realized according to the right of the present application. The equivalent changes required to be made still belong to the scope covered by the invention.

Claims (9)

1. A method of data transmission, the method comprising:

the second wireless node receives data sent by the first wireless node in the TXOP transmission opportunity period; wherein the first wireless node is a holder of the TXOP;

when the second wireless node has data to be sent to the first wireless node, the second wireless node determines a time t1 at which the first wireless node completes data sending in the TXOP period;

the second wireless node transmitting data to the first wireless node according to time t 2; wherein, the time interval between the time t2 and the time t1 is the SIFS minimum interframe space;

wherein the determining, by the second wireless node, a time t1 at which the first wireless node completes data transmission within the TXOP period comprises:

when the second wireless node receives a CF-END contention free period ending frame from a first wireless node, determining that the first wireless node completes data transmission;

taking the END time of the CF-END frame as the time t 1; wherein the CF-END frame indicates that the TXOP period is over, and stations other than the second wireless node resume performing a contention channel by a DIFS after the time t 1.

2. The method of claim 1, wherein the second wireless node determining a time t1 at which the first wireless node completes data transmission within the TXOP period comprises:

the second wireless node receives a DATA frame sent by the first wireless node in a TXOP period;

determining that the first wireless node completes transmission of DATA when a transmission end indicator in the DATA frame is a first value;

the second wireless node sends an ACK frame corresponding to the DATA frame to the first wireless node;

the end time of the ACK frame is taken as the time t 1.

3. The method of claim 1, wherein the second wireless node sending data to the first wireless node according to time t2, comprising:

the second wireless node transmits a DATA frame to the first wireless node starting at time t 2.

4. The method of claim 1, wherein the second wireless node sending data to the first wireless node according to time t2, comprising:

the second wireless node transmitting an RTS request to send frame to the first wireless node starting at time t 2;

and when the second wireless node receives a CTS frame returned by the first wireless node in response to the RTS frame, the second wireless node sends a DATA frame to the first wireless node.

5. The method of claim 3 or 4, further comprising:

when the second wireless node does not receive the ACK frame corresponding to the DATA frame from the first wireless node within a preset time length, acquiring the retransmission times of the DATA frame;

and when the retransmission times are less than the preset times, the second wireless node retransmits the DATA frame to the first wireless node.

6. The method of claim 5, further comprising:

and outputting sending failure prompt information when the retransmission times are equal to the preset times.

7. A data transmission apparatus, comprising:

a transceiving unit, configured to receive data sent by a first wireless node in a TXOP period; wherein the first wireless node is a holder of the TXOP;

a processing unit, configured to determine, when there is data to be sent to the first wireless node, a time t1 at which the first wireless node completes data sending in the TXOP period;

the transceiving unit is further configured to transmit data to the first wireless node according to time t 2; wherein, the time interval between the time t2 and the time t1 is the SIFS minimum interframe space;

determining, by the second wireless node, a time t1 at which the first wireless node completes data transmission in the TXOP period includes:

when the second wireless node receives a CF-END contention-free period END frame from a first wireless node, determining that the first wireless node completes data transmission;

taking the END time of the CF-END frame as the time t 1; wherein the CF-END frame indicates that the TXOP period is over, and stations other than the second wireless node resume performing a contention channel by a DIFS after the time t 1.

8. A computer storage medium, characterized in that it stores a plurality of instructions adapted to be loaded by a processor and to perform the method steps according to any of claims 1 to 6.

9. A wireless node, comprising: a processor, a memory, and a wireless module; wherein the memory stores a computer program adapted to be loaded by the processor and to perform the method steps of any of claims 1 to 6.

Images