CN106686635B - Data transmission method and device based on control and configuration protocol of wireless access point - Google Patents
Data transmission method and device based on control and configuration protocol of wireless access point Download PDFInfo
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- CN106686635B CN106686635B CN201510756079.5A CN201510756079A CN106686635B CN 106686635 B CN106686635 B CN 106686635B CN 201510756079 A CN201510756079 A CN 201510756079A CN 106686635 B CN106686635 B CN 106686635B
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Abstract
The application discloses a data transmission method and device based on a control and configuration protocol of a wireless access point. One embodiment of the method comprises: receiving a data message sent by a wireless access point, wherein the data message comprises an internet protocol address and a port number of the wireless access point; determining a first data processing process for processing the data message from a plurality of data processing processes; generating a response message based on the analysis of the first data processing process on the data message; and sending the response message to the wireless access point based on the Internet protocol address and the port number. The embodiment improves the expansibility of the wireless access point and reduces the cost of wireless communication.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a wireless communication system, and in particular, to a method and an apparatus for data transmission based on a control and configuration protocol of a wireless access point.
Background
The field of Wireless Local Area networks (WLAN for short) provides a Wireless connection service of a Local Area Network, which can provide high-speed Wireless data access and enable users to enjoy ubiquitous information services. Currently, the wlan technology is mainly implemented by combining an Access Controller (AC) and a wireless Access Point (AP).
In order to facilitate management And configuration of the Access controller to the Wireless Access point, the Internet Engineering Task Force (IETF) sets a Control And configuration Protocol (CAPWAP) of the Wireless Access point to achieve standardized management of the Access controller to the Wireless Access point. However, with the expansion of wireless networks, the number of wireless access points to be accessed increases rapidly, more access controllers are required, the cost of the wireless local area network increases, and the access controllers belong to hardware devices, and the expansion flexibility is poor, so people are required to find a more effective way to manage and configure the wireless access points.
Disclosure of Invention
The present application aims to provide a data transmission method and apparatus based on a control and configuration protocol of a wireless access point, so as to solve the technical problems mentioned in the above background section.
In a first aspect, the present application provides a data transmission method based on a control and configuration protocol of a wireless access point, the method including: receiving a data message sent by a wireless access point, wherein the data message comprises an internet protocol address and a port number of the wireless access point; determining a first data processing process for processing the data message from a plurality of data processing processes; generating a response message based on the analysis of the first data processing process on the data message; and sending the response message to the wireless access point based on the Internet protocol address and the port number.
In some embodiments, the generating a response packet based on the parsing of the data packet by the first data processing process comprises: analyzing the data message based on the first data processing process to acquire head message information, data message information and control message information of the data message; and generating a response message based on the acquired header message information, data message information and control message information of the data message.
In some embodiments, the generating a response packet based on the obtained header message information, data message information, and control message information of the data packet includes: acquiring a physical address of the wireless access point according to the acquired header message information of the data message; determining the type of the data message according to the acquired control message information of the data message; acquiring connection state information of the wireless access point based on the physical address of the wireless access point and the type of the data message; and generating a response message based on the data message information and the connection state information of the wireless access point.
In some embodiments, said sending said response packet to said wireless access point based on said internet protocol address and said port number comprises: establishing user datagram protocol connection with the wireless access point according to the internet protocol address and the port number of the wireless access point; and sending the response message to the wireless access point based on the user datagram protocol connection.
In some embodiments, the method further comprises: judging whether the length of the response message is larger than a preset threshold value or not; and if the length of the response message is greater than a preset threshold value, performing data sub-packet processing on the response message.
In some embodiments, the method further comprises: before a first data processing process for processing the data message is determined from a plurality of data processing processes, a plurality of data processing processes for processing the data message are created in advance.
In a second aspect, the present application provides a data transmission apparatus based on a control and configuration protocol of a wireless access point, the apparatus comprising: the receiving module is used for receiving a data message sent by a wireless access point, wherein the data message comprises an internet protocol address and a port number of the wireless access point; the data processing process determining module is used for determining a first data processing process for processing the data message from a plurality of data processing processes; the analysis module is used for generating a response message based on the analysis of the first data processing process to the data message; and the sending module is used for sending the response message to the wireless access point based on the internet protocol address and the port number.
In some embodiments, the data processing procedure determining module is specifically configured to: acquiring the maximum task load capacity and the current task load capacity of each data processing process; determining the first data processing process based on the maximum task load amount and the current task load amount.
In some embodiments, the parsing module is specifically configured to: analyzing the data message based on the first data processing process to acquire head message information, data message information and control message information of the data message; and generating a response message based on the acquired header message information, data message information and control message information of the data message.
In some embodiments, the parsing module is further configured to: acquiring a physical address of the wireless access point according to the acquired header message information of the data message; determining the type of the data message according to the acquired control message information of the data message; acquiring connection state information of the wireless access point based on the physical address of the wireless access point and the type of the data message; and generating a response message based on the data message information and the connection state information of the wireless access point.
In some embodiments, the sending module is specifically configured to: establishing user datagram protocol connection with the wireless access point according to the internet protocol address and the port number of the wireless access point; and sending the response message to the wireless access point based on the user datagram protocol connection.
In some embodiments, the apparatus further comprises: the judging module is used for judging whether the length of the response message is greater than a preset threshold value or not; and if the length of the response message is greater than a preset threshold value, performing data sub-packet processing on the response message.
In some embodiments, the apparatus further comprises: the data processing process creating module is used for creating a plurality of data processing processes for processing the data message in advance before determining a first data processing process for processing the data message from the plurality of data processing processes.
According to the data transmission method and device based on the control and configuration protocol of the wireless access point, the data message sent by the wireless access point is analyzed by using the data processing process, the response message is generated, and then the response message is sent to the wireless access point.
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Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is an exemplary system architecture diagram in which the present application may be applied;
FIG. 2 is a flow diagram of one embodiment of a method for data transmission based on a wireless access point control and configuration protocol according to the present application;
fig. 3 is a schematic flow chart diagram of one implementation of determining a data processing procedure in a data transmission method based on a control and configuration protocol of a wireless access point according to the present application;
FIG. 4 is a schematic flow chart diagram illustrating one implementation of parsing data packets in a data transmission method based on a control and configuration protocol of a wireless access point according to the present application;
fig. 5 is a schematic flow chart of one implementation of sending data packets in a data transmission method based on a control and configuration protocol of a wireless access point according to the present application;
FIG. 6 is a block diagram illustrating an embodiment of a data transmission device based on a wireless access point control and configuration protocol according to the present application;
fig. 7 is a schematic structural diagram of a computer system suitable for implementing the terminal device or the server according to the embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 illustrates an exemplary system architecture 100 to which embodiments of the wireless access point based control and configuration protocol data transmission methods or apparatus of the present application may be applied.
As shown in fig. 1, the system architecture 100 may include terminal devices 101, 102, 103, a network access device 104, and a server 105. The network access device 104 serves as a medium for providing communication links between the terminal devices 101, 102, 103 and the server 105.
The user may use the terminal device 101, 102, 103 to interact with the server 105 through the wireless connectivity service provided by the network access device 104, enabling the terminal device to communicate with the network. Network access device 104 may include, but is not limited to: a wireless access point and/or a Customer Premises Equipment (CPE) for short. The following description is given by taking the network access device as a wireless access point.
The terminal devices 101, 102, 103 may be various wireless electronic devices, including but not limited to smart phones, tablet computers, e-book readers, MP3 players (Moving Picture Experts Group Audio Layer III, mpeg compression standard Audio Layer 3), MP4 players (Moving Picture Experts Group Audio Layer IV, mpeg compression standard Audio Layer 4), laptop and desktop computers, and the like.
The server 105 may be a server providing various services, such as a background web server providing support for network access requests sent by the terminal devices 101, 102, 103. The background network server can analyze and process the received data such as the network access request and the like, and send the processing result to the wireless access point, so that the terminal equipment can communicate with the network.
It should be noted that the data transmission method based on the control and configuration protocol of the wireless access point provided in the embodiment of the present application is generally executed by the server 105, and accordingly, the data transmission device based on the control and configuration protocol of the wireless access point is generally disposed in the server 105.
It should be understood that the number of terminal devices, wireless access points, and servers in fig. 1 are merely illustrative. There may be any number of terminal devices, wireless access points, and servers, as desired for implementation.
With continued reference to fig. 2, a flow diagram 200 of one embodiment of a method for data transmission based on a wireless access point control and configuration protocol in accordance with the present application is shown. The data transmission method based on the control and configuration protocol of the wireless access point comprises the following steps:
In this embodiment, an electronic device (for example, a server shown in fig. 1) on which the data transmission method based on the control and configuration protocol of the wireless access point operates may receive a data packet based on the control and configuration protocol of the wireless access point from the wireless access point through a wired connection manner or a wireless connection manner, where the data packet includes an internet protocol address and a port number of the wireless access point.
In some optional implementations of this embodiment, a plurality of threads for processing data packets are pre-constructed, and the threads are managed and invoked through a thread pool. In this embodiment, the received data packets may be different types of data packets, for example, the types may be Discovery Request data packets, Join Request data packets, and the like, and each data packet type corresponds to one thread. When receiving the data message sent by the wireless access point, calling the thread in the thread pool according to different message types, processing the received data message, and obtaining the internet protocol address and the port number of the wireless access point. And then, converting the received byte type data message into a data message in a hexadecimal format for the next data message analysis.
In this embodiment, after acquiring the data packet sent by the wireless access point, the electronic device selects an appropriate data processing procedure from a plurality of data processing procedures as a first data processing procedure for processing the acquired data packet. In some optional implementations of this embodiment, the first data processing process may be selected in a load balancing manner. For example, the number of data packets that can be processed by each data processing process is obtained through statistics, and then, a most idle data processing process is selected as a first data processing process for processing the data packets.
In some optional implementations of this embodiment, the method further includes: before a first data processing process for processing a data packet is determined from a plurality of data processing processes, a plurality of data processing processes for processing the data packet are created in advance. In this embodiment, a plurality of data processing processes for parsing data packets may be created according to the number of data packets that need to be processed.
It should be noted that the data packet of the control and configuration protocol of the wireless access point also includes other types of data packets, which is a well-known technology widely studied and applied at present and is not described herein again.
In this embodiment, the electronic device may establish a connection with the wireless access point through an internet protocol address and a port number of the wireless access point. And then, sending the response message to the wireless access point based on the established connection to finish the data transmission. Here, the connection mode established between the electronic device and the wireless access point may be a long connection mode or a short connection mode of a transmission control protocol, or may be other similar connection modes.
In some optional implementations of this embodiment, the method further includes: and judging whether the length of the response message is greater than a preset threshold value or not, and if the length of the response message is greater than the preset threshold value, performing data sub-packet processing on the response message. Here, the preset threshold is smaller than a Maximum Transfer Unit (MTU) permitted by a link in communication. And when the length of the response message is larger than a preset threshold value, performing data packet processing on the response message, so that each separated response message is allowed to be transmitted in the communication link.
In this embodiment, the electronic device analyzes the data packet sent by the wireless access point by using the data processing process, generates a response packet, and then sends the response packet to the wireless access point.
In some alternative implementations, as shown in fig. 3, the "determining a first data processing process for processing a data packet from a plurality of data processing processes" in step 202 may be implemented by:
In this implementation manner, the electronic device (for example, the server shown in fig. 1) may obtain a maximum task load amount and a current task load amount that each data processing process can accommodate. Here, the maximum task load amount refers to the number of data packets that can be accommodated by the process, and the current task load amount refers to the number of data packets being processed and waiting for processing by the process.
In the implementation manner, after the maximum task load and the current task load of each data processing process are obtained, the difference between the maximum task load and the current task load is calculated, and the number of idle tasks of each data processing process is obtained. Here, the data processing process having the largest number of idle tasks may be selected as the first data processing process.
It should be noted that in some alternative implementations, a task waiting queue may be established. And when the number of idle tasks of each data processing process is zero, storing the data messages to be processed in the task waiting queue for continuously waiting until one data processing process is idle, and continuing to perform the next analysis operation. The realization mode can improve the efficiency of data message analysis.
In some alternative implementations, as shown in fig. 4, the "generating a response message based on parsing of the data message by the first data processing process" in step 203 may be implemented by:
In this implementation manner, the electronic device (for example, the server shown in fig. 1) analyzes the received data packet by using the determined first data processing procedure, and obtains header message information, data message information, and control message information of the data packet.
In this implementation manner, after obtaining the header message information of the data packet, the electronic device may obtain the physical address of the wireless access point according to the data packet format in the control and configuration protocol of the wireless access point.
In this implementation manner, the electronic device obtains the control message information of the data packet, and determines the type of the data packet according to the type of the control message. Here, the control message information is located after the header message information of the data packet, and includes different types, for example, Discovery, Join, Image data, and the like.
And step 404, acquiring the connection state information of the wireless access point based on the physical address of the wireless access point and the type of the data message.
In this implementation manner, the electronic device may cache the obtained information associated with the physical address of the wireless access point and the type of the control message in the data message, and determine and record the connection state information of the wireless access point according to the associated information.
In this implementation manner, the electronic device stores the acquired data message information, and generates a response message according to the connection state information of the wireless access point. Here, the generated response message needs to be converted into a byte type response message, and the length of the response message cannot exceed the maximum transmission unit permitted by the link in communication. Therefore, a threshold value may be set for the length of the response packet, where the threshold value is smaller than the maximum transmission unit, and when the length of the response packet exceeds the threshold value, the response packet needs to be packetized.
In some alternative implementations, as shown in fig. 5, the "sending the response message to the wireless access point based on the internet protocol address and the port number" of step 204 may be implemented by the following steps:
In this implementation, the electronic device (e.g., the server shown in fig. 1) establishes a user datagram protocol connection with the wireless access point according to the internet protocol address and the port number of the wireless access point. Here, the user datagram protocol connection is a connection that is established only when data transmission is required, and does not need to be maintained all the time. The connection mode can reduce the consumption of memory resources and solve the problem of slow running of the system caused by overhigh load.
In this implementation manner, the electronic device sends a response message to the wireless access point through a user datagram protocol connection.
With further reference to fig. 6, as an implementation of the methods shown in the above-mentioned figures, the present application provides an embodiment of a data transmission apparatus based on a control and configuration protocol of a wireless access point, where the embodiment of the apparatus corresponds to the embodiment of the method shown in fig. 2, and the apparatus may be applied to various electronic devices.
As shown in fig. 6, the data transmission apparatus 600 based on the control and configuration protocol of the wireless access point according to this embodiment includes: a receiving module 601, a data processing progress determining module 602, a parsing module 603 and a sending module 604. The receiving module 601 is configured to determine a first data processing process for processing a data packet from a plurality of data processing processes; the data processing process determining module 602 is configured to determine a first data processing process for processing a data packet from a plurality of data processing processes; the parsing module 603 is configured to parse the data packet based on the first data processing process, and generate a response packet; and the receiving module 604 is configured to send a response message to the wireless access point based on the internet protocol address and the port number.
In some optional implementations of this embodiment, the apparatus 600 further includes: a judging module (not shown) for judging whether the length of the response packet is greater than a preset threshold, and if the length of the response packet is greater than the preset threshold, performing data sub-packet processing on the response packet; a data processing process creating module (not shown) for creating a plurality of data processing processes for processing the data packet in advance before determining a first data processing process for processing the data packet from the plurality of data processing processes.
In this embodiment, the data process determining module 602 may determine the first data processing process for parsing the data packet according to the maximum task load and the current task load of each data processing process.
In this embodiment, the parsing module 603 may parse the data packet by using a first data processing process to obtain header message information, data message information, and control message information of the data packet. The information selecting unit 603 is further configured to obtain a physical address of the wireless access point, a type of a data packet, a connection state of the wireless access point, and the like according to the obtained header message information, data message information, and control message information, and finally generate a response packet.
Those skilled in the art will appreciate that the above-described wireless access point based control and configuration protocol data transmission apparatus 600 also includes some other well-known structures, such as processors, memories, etc., which are not shown in fig. 6 in order to not unnecessarily obscure embodiments of the present disclosure.
Referring now to FIG. 7, shown is a block diagram of a computer system 700 suitable for use in implementing a terminal device or server of an embodiment of the present application.
As shown in fig. 7, the computer system 700 includes a Central Processing Unit (CPU)701, which can perform various appropriate actions and processes in accordance with a program stored in a Read Only Memory (ROM)702 or a program loaded from a storage section 708 into a Random Access Memory (RAM) 703. In the RAM 703, various programs and data necessary for the operation of the system 700 are also stored. The CPU 701, the ROM 702, and the RAM 703 are connected to each other via a bus 704. An input/output (I/O) interface 705 is also connected to bus 704.
The following components are connected to the I/O interface 705: an input portion 706 including a keyboard, a mouse, and the like; an output section 707 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; a storage section 708 including a hard disk and the like; and a communication section 709 including a network interface card such as a LAN card, a modem, or the like. The communication section 709 performs communication processing via a network such as the internet. A drive 710 is also connected to the I/O interface 705 as needed. A removable medium 711 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 710 as necessary, so that a computer program read out therefrom is mounted into the storage section 708 as necessary.
In particular, according to an embodiment of the present disclosure, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program can be downloaded and installed from a network through the communication section 709, and/or installed from the removable medium 711.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The modules described in the embodiments of the present application may be implemented by software or hardware. The described modules may also be provided in a processor, which may be described as: a processor comprises a receiving module, a data processing process determining module, a parsing module and a sending module. The names of these modules do not limit the modules themselves in some cases, and for example, a receiving module may also be described as a "module that receives a data packet sent by a wireless access point.
As another aspect, the present application also provides a non-volatile computer storage medium, which may be the non-volatile computer storage medium included in the apparatus in the above-described embodiments; or it may be a non-volatile computer storage medium that exists separately and is not incorporated into the terminal. The non-transitory computer storage medium stores one or more programs that, when executed by a device, cause the device to: receiving a data message sent by a wireless access point, wherein the data message comprises an internet protocol address and a port number of the wireless access point; determining a first data processing process for processing the data message from a plurality of data processing processes; generating a response message based on the analysis of the first data processing process on the data message; and sending the response message to the wireless access point based on the Internet protocol address and the port number.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (12)
1. A data transmission method based on a control and configuration protocol of a wireless access point is applied to a server and comprises the following steps:
receiving a data message sent by a wireless access point, wherein the data message comprises an internet protocol address and a port number of the wireless access point;
determining a first data processing process for processing the data message from a plurality of data processing processes;
generating a response message based on the analysis of the first data processing process on the data message;
sending the response message to the wireless access point based on the internet protocol address and the port number; wherein the content of the first and second substances,
the generating a response packet based on the parsing of the data packet by the first data processing process includes:
analyzing the data message based on the first data processing process to acquire head message information, data message information and control message information of the data message;
and generating a response message based on the acquired header message information, data message information and control message information of the data message.
2. The method of claim 1, wherein the determining a first data processing procedure from a plurality of data processing procedures for processing the data packet comprises:
acquiring the maximum task load capacity and the current task load capacity of each data processing process;
determining the first data processing process based on the maximum task load amount and the current task load amount.
3. The method according to claim 1, wherein the generating a response packet based on the acquired header message information, data message information, and control message information of the data packet comprises:
acquiring a physical address of the wireless access point according to the acquired header message information of the data message;
determining the type of the data message according to the acquired control message information of the data message;
acquiring connection state information of the wireless access point based on the physical address of the wireless access point and the type of the data message;
and generating a response message based on the data message information and the connection state information of the wireless access point.
4. The method for data transmission according to a control and configuration protocol of a wireless access point according to any of claims 1 to 3, wherein the sending the response message to the wireless access point based on the internet protocol address and the port number comprises:
establishing user datagram protocol connection with the wireless access point according to the internet protocol address and the port number of the wireless access point;
and sending the response message to the wireless access point based on the user datagram protocol connection.
5. The method of claim 3, further comprising:
judging whether the length of the response message is larger than a preset threshold value or not;
and if the length of the response message is greater than a preset threshold value, performing data sub-packet processing on the response message.
6. The method for data transmission based on a control and configuration protocol of a wireless access point according to claim 5, further comprising:
before a first data processing process for processing the data message is determined from a plurality of data processing processes, a plurality of data processing processes for processing the data message are created in advance.
7. A data transmission apparatus based on a control and configuration protocol of a wireless access point, wherein the apparatus is applied to a server, and comprises:
the receiving module is used for receiving a data message sent by a wireless access point, wherein the data message comprises an internet protocol address and a port number of the wireless access point;
the data processing process determining module is used for determining a first data processing process for processing the data message from a plurality of data processing processes;
the analysis module is used for generating a response message based on the analysis of the first data processing process to the data message;
a sending module, configured to send the response packet to the wireless access point based on the internet protocol address and the port number; wherein the content of the first and second substances,
the parsing module is further to:
analyzing the data message based on the first data processing process to acquire head message information, data message information and control message information of the data message;
and generating a response message based on the acquired header message information, data message information and control message information of the data message.
8. The wireless access point-based control and configuration protocol data transmission apparatus according to claim 7, wherein the data processing procedure determining module is specifically configured to:
acquiring the maximum task load capacity and the current task load capacity of each data processing process;
determining the first data processing process based on the maximum task load amount and the current task load amount.
9. The wireless access point-based control and configuration protocol data transmission apparatus of claim 7, wherein the parsing module is further configured to:
acquiring a physical address of the wireless access point according to the acquired header message information of the data message;
determining the type of the data message according to the acquired control message information of the data message;
acquiring connection state information of the wireless access point based on the physical address of the wireless access point and the type of the data message;
and generating a response message based on the data message information and the connection state information of the wireless access point.
10. The apparatus for data transmission based on a control and configuration protocol of a wireless access point according to one of claims 7 to 9, wherein the sending module is specifically configured to:
establishing user datagram protocol connection with the wireless access point according to the internet protocol address and the port number of the wireless access point;
and sending the response message to the wireless access point based on the user datagram protocol connection.
11. The wireless access point based control and configuration protocol data transmission apparatus of claim 9, wherein the apparatus further comprises:
the judging module is used for judging whether the length of the response message is greater than a preset threshold value or not;
and if the length of the response message is larger than a preset threshold value, performing data sub-packet processing on the response message.
12. The wireless access point based control and configuration protocol data transmission apparatus of claim 11, wherein the apparatus further comprises:
the data processing process creating module is used for creating a plurality of data processing processes for processing the data message in advance before determining a first data processing process for processing the data message from the plurality of data processing processes.
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| CN107333274B (en) * | 2017-07-03 | 2023-09-05 | 铂元智能科技(北京)有限公司 | wireless transmission system |
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