CN107370526B - Data transmission method and terminal equipment - Google Patents
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- H—ELECTRICITY
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- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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Abstract
The embodiment of the invention provides a data transmission method and terminal equipment, wherein the method comprises the steps that when first terminal equipment in a multi-user multi-input multi-output (MIMO) wireless local area network (W L AN) system sends data to a wireless Access Point (AP), the number of second terminal equipment which are transmitting data in a channel is periodically detected, whether a target frame is broadcasted in the channel or not is detected, the target frame is used for indicating that data transmission conflict is generated in the channel, and if the number of the second terminal equipment exceeds the maximum number which can be borne by the AP and/or the target frame is broadcasted in the channel, the first terminal equipment stops sending the data.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a data transmission method and terminal equipment.
Background
A multi-user multi-Input multi-Output (MIMO) Wireless local Area network (W L AN) system is a communication system which allows a plurality of users to communicate with the same Wireless Access Point (AP) at the same time.
However, in the uplink channel access mechanism of the system, the influence of the failed transmission on the channel occupation time is not considered, and the user can only find the data transmission failure through the absence of the ACK frame after the data transmission is finished, so that the failed transmission time is long, and the waste of time and resources is caused.
Disclosure of Invention
The embodiment of the invention provides a data transmission method and terminal equipment, which are used for reducing the failure transmission time of data in a channel and improving the utilization rate of channel resources.
A first aspect of an embodiment of the present invention provides a data transmission method, where the method includes:
when a first terminal device in a multi-user multiple-input multiple-output (MIMO) wireless local area network (W L AN) system sends data to a wireless Access Point (AP), periodically detecting the number of second terminal devices transmitting data in a channel and whether a target frame is broadcast in the channel, wherein the target frame is used for indicating that data transmission collision is generated in the channel;
and if the number of the second terminal equipment exceeds the maximum number which can be borne by the AP and/or the target frame is broadcasted in the channel, the first terminal equipment stops sending data.
A second aspect of the embodiments of the present invention provides a terminal device, where the terminal device is applicable to a MIMO W L AN system, and the terminal device includes:
the wireless access point AP comprises a first detection module, a second detection module and a third detection module, wherein the first detection module is used for periodically detecting the number of second terminal equipment transmitting data in a channel and whether a target frame is broadcasted in the channel when the data are transmitted to the wireless access point AP, and the target frame is used for indicating that data transmission collision is generated in the channel;
a sending module, configured to stop sending data when the number of the second terminal devices exceeds the maximum number that can be borne by the AP and/or the target frame is broadcast in the channel.
In the embodiment of the invention, when the first terminal device sends data to the wireless access point AP, the first terminal device stops sending data by periodically detecting the number of second terminal devices which are transmitting data in a channel and detecting whether a target frame indicating that data transmission collision is generated in the channel is broadcast in the channel, wherein when the number of the second terminal devices exceeds the maximum number which can be carried by the AP and/or the target frame is broadcast in the channel. The embodiment of the invention periodically detects the data transmission condition in the channel in the data transmission process, so that the data transmission conflict occurring in the channel can be found in time in the data transmission process, and then the data transmission is stopped in time, the failure transmission time of the data in the channel is reduced, and the utilization rate of the channel resource is improved.
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, and 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 these drawings without creative efforts.
Fig. 1 is a schematic view of a scenario provided in an embodiment of the present invention;
fig. 2 is a flowchart of a data transmission method according to an embodiment of the present invention;
fig. 3 is a flowchart of a data transmission method according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a terminal device according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal device according to yet another embodiment of 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.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention, are intended to cover non-exclusive inclusions, e.g., a process or an apparatus that comprises a list of steps is not necessarily limited to those structures or steps expressly listed but may include other steps or structures not expressly listed or inherent to such process or apparatus.
Fig. 1 is a schematic view of a scenario provided in an embodiment of the present invention, in which n terminal devices communicate with a wireless access point AP simultaneously. When an access mechanism of an uplink channel (i.e. a channel for a terminal device to transmit data to an AP) is studied in this scenario, the following factors are mainly considered:
channel utilization rate: the asynchronous channel access mechanism allows a plurality of users to transmit simultaneously in the same transmission process, so that channel resources can be fully utilized, the channel utilization rate is improved, and the system performance is further improved.
Collision probability: the binary exponential backoff algorithm needs a user to select a random backoff value for backoff, so that the probability of collision of the user can be effectively reduced, the time of failed transmission is reduced, and the system performance is improved.
Duration of failed transmission of data: when collision occurs, the AP broadcasts the control frame to inform all users to stop current transmission in time, so that the occupation of channel time by failure transmission can be reduced, and the system performance is improved.
Data integrity: if collision occurs in the transmission process, the current transmission is failed transmission, and the data packet in the current transmission needs to be retransmitted. If the retransmission factor is not considered sufficiently in the design of the channel access mechanism, the data packet will be lost, and the data integrity will be affected. In terms of ensuring data integrity, it is effective to use a confirmation mechanism: if the AP successfully receives the data frame from the user, replying a confirmation frame to each sending user, and if the user receives the confirmation frame within the specified time, considering that the transmission is successful, and starting to prepare for next transmission; otherwise, if the AP does not successfully receive the data frame, the AP does not reply the acknowledgment frame to the sending user, and the sending user does not receive the acknowledgment frame from the AP within the specified time, and then determines that collision has occurred and starts to prepare for the next retransmission.
The existing uplink channel access mechanism of the multi-user MIMO W L AN system is a channel access mechanism based on carrier sense multiple access/collision avoidance (CSMA/CA). The channel utilization rate is improved by adopting AN asynchronous channel access mechanism, the collision probability of users competing for a channel is reduced by adopting a binary exponential backoff algorithm, the data integrity is ensured by adopting a confirmation mechanism, but the occupation of the channel time by the failed transmission is not considered, and the defect of long time of the failed transmission exists.
In view of the above problems in the above scenario, an embodiment of the present invention provides a data transmission method, where when a terminal device sends data to an AP, the number of terminal devices that are transmitting data in a channel is periodically detected, and it is determined whether a target frame indicating that a data transmission collision exists in the current channel exists in the channel, and when the number of terminal devices that are transmitting data in the channel exceeds a maximum number that can be borne by the AP and/or the target frame exists in the channel, the terminal device stops sending data, so as to achieve the purposes of finding the data transmission collision in time, reducing a time for failed transmission of data in the channel, and improving a utilization rate of channel resources.
Fig. 2 is a flowchart of a data transmission method according to AN embodiment of the present invention, which may be performed by a terminal device in a multi-user MIMO W L AN system, as shown in fig. 2, where the method includes:
The channels involved in this embodiment are all uplink channels, that is, channels used by the terminal device to transmit data to the AP.
The first terminal device is any terminal device that is transmitting data in a channel, the second terminal device is a terminal device that is transmitting data in a channel except the first terminal device, and the second terminal device may be one or a plurality of terminal devices.
The target frame referred to in this embodiment may be broadcasted by the AP in the channel, or may be broadcasted by other terminal devices that are transmitting data in the channel. Specifically, when the AP and/or the terminal device in the channel finds that data in the channel is collided during transmission, or fails to be successfully transmitted to the AP due to other reasons, the AP and/or the terminal device in the channel broadcasts a target frame in the channel to prompt that other terminal devices in the channel are unavailable.
When the multi-user MIMO W L AN system is established, the AP needs to determine the number of active terminal devices according to the number of terminal devices sending association response frames, and further determines the maximum number of terminal devices that can be carried by the AP (i.e., the maximum number of terminal devices allowed to be accessed in parallel) by combining the number of its own effective receiving antennas.
When the number of terminal devices transmitting data in the channel exceeds the maximum number that can be carried by the AP, the data transmitted in the channel will inevitably collide because the AP does not have enough receiving antennas to receive the parallel data. At this time, the first terminal device stops transmitting data.
When the target frame broadcasted by the AP and/or other terminal equipment exists in the channel, the AP and/or other terminal equipment detects that data transmission collision occurs in the channel, and at the moment, the first terminal equipment stops sending data.
Further, if the number of terminal devices that are transmitting data in the channel exceeds the maximum number that can be carried by the AP and the channel does not include the target frame, it indicates that a data transmission collision exists in the channel, and the first terminal device is a device that has a data transmission collision in the first discovery channel, and at this time, the first terminal broadcasts the target frame in the channel to prompt other terminal devices in the channel and/or the AP channel to have a data transmission collision.
In this embodiment, when the first terminal device transmits data to the wireless access point AP, the first terminal device periodically detects the number of second terminal devices transmitting data in the channel and detects whether a target frame indicating that a data transmission collision occurs in the channel is broadcast in the channel, wherein when the number of second terminal devices exceeds the maximum number that can be carried by the AP and/or the target frame is broadcast in the channel, the data transmission is stopped. In the embodiment, the data transmission condition in the channel is periodically detected in the data transmission process, so that the data transmission conflict occurring in the channel can be timely found in the data transmission process, the data transmission is timely stopped, the time of failed transmission of the data in the channel is reduced, and the utilization rate of channel resources is improved.
Fig. 3 is a flowchart of a data transmission method according to another embodiment of the present invention, as shown in fig. 3, based on the embodiment of fig. 2, the method includes:
The preset time interval may be set according to a system type of the system and a requirement of the system, and is not specifically limited in this embodiment.
In this embodiment, during the period when the first terminal device executes the backoff mechanism, the first terminal device continuously monitors the number of terminal devices that are transmitting data in the channel, and matches the number of terminal devices with the number of terminal devices that can be borne by the AP, in a matching process, if the number of terminal devices that are transmitting data in the channel is less than the number of terminal devices that can be borne by the AP, the backoff timer is decreased by 1, otherwise, the terminal device stops the current backoff mechanism, and starts to prepare for channel contention for next transmission. And so on, when the timing of the back-off timer is reached, the first terminal device executes step 203.
In this embodiment, the third terminal device refers to a terminal device that is transmitting data in a channel before the first terminal device has not accessed the channel.
In this embodiment, when the first terminal device transmits data to the wireless access point AP, the first terminal device periodically detects the number of second terminal devices transmitting data in the channel and detects whether a target frame indicating that a data transmission collision occurs in the channel is broadcast in the channel, wherein when the number of second terminal devices exceeds the maximum number that can be carried by the AP and/or the target frame is broadcast in the channel, the data transmission is stopped. In the embodiment, the data transmission condition in the channel is periodically detected in the data transmission process, so that the data transmission conflict occurring in the channel can be timely found in the data transmission process, the data transmission is timely stopped, the time of failed transmission of the data in the channel is reduced, and the utilization rate of channel resources is improved.
Fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present invention, and as shown in fig. 4, the terminal device includes:
a first detecting module 11, configured to periodically detect, when sending data to a wireless access point AP, the number of second terminal devices that are transmitting data in a channel, and whether a target frame is broadcast in the channel, where the target frame is used to indicate that a data transmission collision occurs in the channel;
a sending module 12, configured to stop sending data when the number of the second terminal devices exceeds the maximum number that can be borne by the AP and/or the target frame is broadcasted in the channel.
Optionally, the method further includes:
a broadcasting module, configured to broadcast the target frame in the channel when the number of the second terminal devices exceeds a maximum number that can be carried by the AP and the channel does not include the target frame.
The terminal device provided in this embodiment can execute the technical solution in the embodiment of fig. 2, and the execution manner and the beneficial effects are similar, which are not described herein again.
Fig. 5 is a schematic structural diagram of a terminal device according to another embodiment of the present invention, as shown in fig. 5, on the basis of the embodiment of fig. 4, the device further includes:
a second detecting module 13, configured to detect, before accessing the channel, the number of third terminal devices that are transmitting data in the channel, and detect whether the target frame is broadcast in the channel;
a channel access module 14, configured to access the channel and trigger the sending module to transmit data on the channel when the number of the third terminals is less than the maximum number that can be borne by the AP and the channel does not include the target frame.
A third detecting module 15, configured to detect whether an idle time of the channel is greater than a preset time interval;
an executing module 16, configured to execute a preset backoff mechanism when the idle time is greater than a preset time interval;
the second detecting module 13 is configured to detect, after the backoff mechanism is successfully completed, the number of third terminal devices that are transmitting data in the channel, and detect whether the target frame is broadcast in the channel.
Optionally, the method further includes:
a monitoring module, configured to continuously monitor whether the number of terminal devices that are transmitting data in the channel exceeds a maximum number that can be borne by the channel when the back-off mechanism is executed;
the executing module is further configured to stop executing the backoff mechanism when the monitoring module monitors that the number of terminal devices that acquire data being transmitted in the channel exceeds the maximum number that can be borne by the channel.
The terminal device provided in this embodiment can execute the technical solution in the embodiment of fig. 3, and the execution manner and the beneficial effects are similar, which are not described herein again.
Fig. 6 is a schematic structural diagram of a terminal device according to another embodiment of the present invention, which may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, etc.
The apparatus 800 may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input/output (I/O) interface 812, a sensor component 814, and a communication component 816.
The processing component 802 generally controls overall operation of the device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.
The memory 804 is configured to store various types of data to support operations at the apparatus 800. Examples of such data include instructions for any application or method operating on device 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The multimedia component 808 includes a screen that provides an output interface between the device 800 and a user, in some embodiments, the screen may include a liquid crystal display (L CD) and a Touch Panel (TP). if the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user.
The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the apparatus 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.
The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the device 800. For example, the sensor assembly 814 may detect the open/closed status of the device 800, the relative positioning of components, such as a display and keypad of the device 800, the sensor assembly 814 may also detect a change in the position of the device 800 or a component of the device 800, the presence or absence of user contact with the device 800, the orientation or acceleration/deceleration of the device 800, and a change in the temperature of the device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 816 is configured to facilitate communications between the apparatus 800 and other devices in a wired or wireless manner. The device 800 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the apparatus 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), programmable logic devices (P L D), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the methods described above.
In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 804 comprising instructions, executable by the processor 820 of the device 800 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
A non-transitory computer readable storage medium in which instructions, when executed by a processor of a terminal device, enable the terminal device to perform a method of:
when a first terminal device in a multi-user multiple-input multiple-output (MIMO) wireless local area network (W L AN) system sends data to a wireless Access Point (AP), periodically detecting the number of second terminal devices transmitting data in a channel and whether a target frame is broadcast in the channel, wherein the target frame is used for indicating that data transmission collision is generated in the channel;
and if the number of the second terminal equipment exceeds the maximum number which can be borne by the AP and/or the target frame is broadcasted in the channel, the first terminal equipment stops sending data.
In the embodiment of the invention, when the first terminal device sends data to the wireless access point AP, the first terminal device stops sending data by periodically detecting the number of second terminal devices which are transmitting data in a channel and detecting whether a target frame indicating that data transmission collision is generated in the channel is broadcast in the channel, wherein when the number of the second terminal devices exceeds the maximum number which can be carried by the AP and/or the target frame is broadcast in the channel. The embodiment of the invention periodically detects the data transmission condition in the channel in the data transmission process, so that the data transmission conflict occurring in the channel can be found in time in the data transmission process, and then the data transmission is stopped in time, the failure transmission time of the data in the channel is reduced, and the utilization rate of the channel resource is improved.
Finally, it should be noted that, as one of ordinary skill in the art will appreciate, all or part of the processes of the methods of the embodiments described above may be implemented by hardware related to instructions of a computer program, where the computer program may be stored in a computer-readable storage medium, and when executed, the computer program may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a Random Access Memory (RAM), or the like.
Each functional unit in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium. The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of data transmission, comprising:
when a first terminal device in a multi-user multiple-input multiple-output (MIMO) wireless local area network (W L AN) system sends data to a wireless Access Point (AP), periodically detecting the number of second terminal devices transmitting data in a channel and whether a target frame is broadcast in the channel, wherein the target frame is used for indicating that data transmission collision is generated in the channel;
and if the number of the second terminal equipment exceeds the maximum number which can be borne by the AP and/or the target frame is broadcasted in the channel, the first terminal equipment stops sending data.
2. The method according to claim 1, characterized in that it comprises:
if the number of the second terminal devices exceeds the maximum number that can be carried by the AP and the target frame is not included in the channel, the first terminal device broadcasts the target frame in the channel.
3. The method of claim 1, wherein prior to periodically detecting the number of second terminal devices transmitting data in a channel and whether a target frame is broadcast in the channel, the method further comprises:
the first terminal equipment detects the number of third terminal equipment which are transmitting data in a channel between the first terminal equipment and the AP, and detects whether the target frame is broadcasted in the channel;
and if the number of the third terminals is less than the maximum number which can be borne by the AP and the target frame is not included in the channel, the first terminal accesses the channel and transmits data on the channel.
4. The method of claim 3, wherein before the first terminal detecting the number of third terminal devices transmitting data in a channel between the first terminal and the AP and detecting whether the target frame is broadcast in the channel, the method further comprises:
the first terminal equipment detects whether the idle time of a channel between the first terminal equipment and the AP is greater than a preset time interval or not;
if so, the first terminal device executes a preset backoff mechanism, detects the number of third terminal devices transmitting data in a channel between the first terminal device and the AP after the backoff mechanism is successfully completed, and detects whether the target frame is broadcast in the channel.
5. The method of claim 4, further comprising:
when executing the backoff mechanism, the first terminal device continuously monitors whether the number of terminal devices transmitting data in the channel exceeds the maximum number which can be borne by the channel;
if so, the first terminal equipment stops executing the backoff mechanism and starts to prepare channel competition of next transmission.
6. A terminal device, the terminal device being adapted for a MIMO W L AN system, comprising:
the wireless access point AP comprises a first detection module, a second detection module and a third detection module, wherein the first detection module is used for periodically detecting the number of second terminal equipment transmitting data in a channel and whether a target frame is broadcasted in the channel when the data are transmitted to the wireless access point AP, and the target frame is used for indicating that data transmission collision is generated in the channel;
a sending module, configured to stop sending data when the number of the second terminal devices exceeds the maximum number that can be borne by the AP and/or the target frame is broadcast in the channel.
7. The terminal device of claim 6, further comprising:
a broadcasting module, configured to broadcast the target frame in the channel when the number of the second terminal devices exceeds a maximum number that can be carried by the AP and the channel does not include the target frame.
8. The terminal device of claim 6, further comprising:
a second detecting module, configured to detect, before accessing the channel, the number of third terminal devices that are transmitting data in the channel, and detect whether the target frame is broadcast in the channel;
a channel access module, configured to access the channel and trigger the sending module to transmit data on the channel when the number of the third terminals is less than the maximum number that can be borne by the AP and the channel does not include the target frame.
9. The terminal device according to claim 8, further comprising:
the third detection module is used for detecting whether the idle time of the channel is greater than a preset time interval or not;
the execution module is used for executing a preset back-off mechanism when the idle time is greater than a preset time interval;
the second detecting module is configured to detect, after the backoff mechanism is successfully completed, the number of third terminal devices that are transmitting data in the channel, and detect whether the target frame is broadcast in the channel.
10. The terminal device according to claim 9, further comprising:
a monitoring module, configured to continuously monitor whether the number of terminal devices that are transmitting data in the channel exceeds a maximum number that can be borne by the channel when the back-off mechanism is executed;
the executing module is further configured to stop executing the backoff mechanism and start to prepare for channel contention for next transmission when the monitoring module monitors that the number of terminal devices acquiring data being transmitted in the channel exceeds the maximum number that can be borne by the channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710819283.6A CN107370526B (en) | 2017-09-12 | 2017-09-12 | Data transmission method and terminal equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710819283.6A CN107370526B (en) | 2017-09-12 | 2017-09-12 | Data transmission method and terminal equipment |
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| CN108495354B (en) * | 2018-03-23 | 2020-09-08 | 北京智芯微电子科技有限公司 | Access control method |
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| CN102656940A (en) * | 2009-12-15 | 2012-09-05 | 高通股份有限公司 | Backoff procedure for post downlink SDMA operation |
| CN101765114A (en) * | 2010-01-18 | 2010-06-30 | 杭州华三通信技术有限公司 | Method, system and equipment for controlling wireless user access |
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