CN104750103A - Wireless data transmission method and device and aircraft control method and device - Google Patents
Wireless data transmission method and device and aircraft control method and device Download PDFInfo
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Abstract
The invention discloses a wireless data transmission method, a wireless data transmission device, an aircraft control method and an aircraft control device. The wireless data transmission method comprises the following steps of transmitting a management frame through a link layer, wherein the management frame is composed of a wireless communication network protocol header, private information and a check digit. According to the wireless data transmission method and the wireless data transmission device, control data can be transmitted through the link layer, so that the redundancy of the communication information is reduced, the transmission efficiency of private information is improved, the setup procedure of a communication link cannot be waited and the data cannot be transmitted by using application layer, and data frames on the link layer are fully utilized; even if the distance between two communicating ends is relatively far or channel disturbance is relatively large, the private information still can be transmitted by the scheme.
Description
Technical field
The present invention relates to data communication field, be specifically related to radio data transmission method and device and flying vehicles control method and apparatus.
Background technology
At present along with the fast development of Internet of Things, the communication such as based on Wi-Fi technology has become a core technology.
At existing radio data transmission method, particularly in wireless control communications transmission method, normally after establishing link layer, transmit data by application layer.Fig. 1 shows the method setting up link layer, as shown in Figure 1, before utilizing wireless network transmissions data, need first to set up communication link through at least 7 steps, beacon frame wherein, probe request and probing response frame (being referred to as explore frame), authentication request frames and authentication response frames (being referred to as authentication frame), agreement request frame and protocol response frame (being referred to as protocol frame) are transmitted all in a link layer, so claim these interaction datas to be link layer data frame, in field of wireless, above-mentioned link layer data frame is called management frames; When after link establishment, communication two ends recycling application program transmits data by application layer, and private information frame wherein and private information response frame, in application layer transmission, are called application layer data frame.As shown in Figure 2, application layer data frame comprises 802.11 stems (being greater than 24 bytes), Ip stem (being greater than 20 bytes), transport layer stem (8 bytes or 20 bytes), private information (indefinite length) and check bit (4 byte).
As can be seen here, there is defect in prior art: 1. in each frame data transmitted by application layer except the private information be transmitted, also comprise the data volume of at least 56 bytes, for the situation that private information itself is fewer, this makes communication two ends produce bulk redundancy information, reduces communication efficiency; 2. for communication two ends distant or when channel disturbance is larger, the communication distance of this radio data transmission method based on application layer is shorter, and anti-interference is all poor.3. existing radio data transmission method underuses link layer data frame, causes the wasting of resources.
Summary of the invention
For this reason, technical matters to be solved by this invention is the redundancy reducing the communication information, improves the transfer efficiency of private information.
The invention provides a kind of radio data transmission method, comprising: send management frames by link layer, described management frames is made up of cordless communication network protocol header, private information and check bit.
Preferably, described private information comprises message prefix and private message.
The invention provides another kind of radio data transmission method, comprising: by link layer receiving management frame, described management frames is made up of cordless communication network protocol header, private information and check bit.
Preferably, described by link layer receiving management frame after also comprise: judge whether the information prefix in described private information equals preset value; When described information prefix equals preset value, obtain the private message in described private information.
Preferably, described private message is 1-32 byte.
Preferably, described management frames is Wi-Fi management frames, described Wi-Fi management frames comprise in beacon frame, explore frame, authentication frame, protocol frame any one.
Correspondingly, the invention provides a kind of wireless data transmission device, comprising: transmitting element, for sending management frames by link layer, described management frames is made up of cordless communication network protocol header, private information and check bit.
Preferably, described private information comprises message prefix and private message.
The invention provides another kind of wireless data transmission device, comprising: receiving element, for passing through link layer receiving management frame, described management frames is made up of cordless communication network protocol header, private information and check bit.
Preferably, above-mentioned wireless data transmission device also comprises: judging unit, for judging whether the information prefix in described private information equals preset value; Acquiring unit, for when described information prefix equals preset value, obtains the private message in described private information.
Preferably, described private message is 1-32 byte.
Preferably, described management frames is Wi-Fi management frames, described Wi-Fi management frames comprise in beacon frame, explore frame, authentication frame, protocol frame any one.
The present invention also provides a kind of flying vehicles control method, utilizes above-mentioned radio data transmission method to carry out transmitting control data.
Correspondingly, the present invention also provides a kind of flying vehicles control device, utilizes above-mentioned wireless data transmission device to carry out transmitting control data.
Radio data transmission method provided by the invention and device can pass through link layer transfer control data, reduce the redundancy of the communication information, improve the transfer efficiency of private information, and do not need the process of establishing waiting for communication link, do not need to use application layer transmission data yet, take full advantage of link layer data frame, even if when communicating the distant of two ends or channel disturbance is larger, utilize such scheme still can complete the transmission work of private information.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is communication scenes schematic diagram when setting up communication link in prior art;
Data frame structure schematic diagram when Fig. 2 is the private data transmitted by application layer;
Fig. 3 is the management frames structural representation encapsulating private information by link layer transfer;
Fig. 4 is the information element structural representation in management frames;
Fig. 5 is private information data structure schematic diagram.
Embodiment
First embodiment of the invention provides a kind of radio data transmission method, the method is applied to first terminal (such as transmitting terminal), send management frames by link layer, described management frames is made up of cordless communication network protocol header, private information and check bit.As shown in Figure 3, the management frames of wireless network is made up of 802.11 stems and check bit originally, and in the radio data transmission method of the present embodiment, private information is encapsulated in management frames, and such as private information can be encapsulated in an information element in management frames.As shown in Figure 4, the information element in management frames is made up of the information value1 of element identification codes Element ID, a length information Length1 and random length, and wherein value1 may be used for encapsulating private information.In addition, the value of the Element ID in management frames has certain implication, and the information element of encapsulation private information should avoid using the Element ID with particular meaning.
Radio data transmission method in the present embodiment directly carries out data transmission in a link layer, relative to prior art, the Frame of the method transmission at least eliminates Ip stem (being greater than 20 bytes) and transport layer stem (UDP 8 byte or TCP 20 byte), reduce the redundancy of information, and do not need the process of establishing waiting for communication link, do not need to use application layer transmission data yet, take full advantage of link layer data frame, improve the transfer efficiency of private information, even if when communicating the distant of two ends or channel disturbance is larger, utilize such scheme still can complete the transmission work of private information.
First embodiment of the invention also provides a kind of radio data transmission method, the method is applied to the second terminal (such as receiving end), by link layer receiving management frame, described management frames is made up of cordless communication network protocol header, private information and check bit.
Preferably, radio data transmission method in the present embodiment can be applied in wireless network (Wi-Fi), in the case, management frames in the present embodiment is Wi-Fi management frames, Wi-Fi management frames comprises beacon frame (beacon), explore frame (probe request/probe response), authentication frame (authrequest/auth response), protocol frame (associate request/associateresponse), and this method can use any one transmission private information in above-mentioned management frames.
The data volume of management frames is usually less, so less demanding to channel condition, such as, when using mobile terminal to connect wireless router, when both sides are distant or channel condition is poor, although mobile terminal can search wireless router, application program accesses network can not be used, this situation and management frames are transmitted, but because channel condition is poor, and the data volume of application layer is comparatively large, so cannot transmit application layer data frame.
Radio data transmission method in the present embodiment directly receives data in a link layer, relative to prior art, its Frame received at least eliminates Ip stem (being greater than 20 bytes) and transport layer stem (UDP 8 byte or TCP 20 byte), reduce the redundancy of information, and do not need the process of establishing waiting for communication link, do not need to use application layer transmission data yet, take full advantage of link layer data frame, improve the transfer efficiency of private information, even if when communicating the distant of two ends or channel disturbance is larger, utilize such scheme still can complete the transmission work of private information.
In actual application environment, the situation that multiple transmitting terminal sends management frames simultaneously may be there is, because management frames belongs to broadcast transmission, so receiving end can receive the management frames that different transmitting terminal sends, comprising the management frames with private information that corresponding first terminal sends, also may comprise the management frames with private information that other first terminals send, or the management frames of not carrying private information that existing terminal (such as radio network router) sends.In order to the identity of distinguishing terminal, in above-mentioned private information, message prefix and private message can be comprised.Wherein, message prefix is for representing the identity of terminal; Private message is self-defining content, and such as described private message is 1-32 byte.The present embodiment can adopt message prefix and TLV format information composition private information, and as shown in Figure 5, Autel is message prefix, and TLV format information comprises type Type, and length information Length2 and private message Value2, Value2 content can be self-defined.
Above-mentioned second terminal is by comprising after link layer receiving management frame:
Judge whether the information prefix in described private information equals preset value, this preset value is the numerical value that communication two ends are preset;
When described information prefix equals preset value, obtain the private message in described private information.Information prefix equals preset value and namely represents that this Frame is the data that corresponding first terminal sends, and now namely obtains private message wherein; If not, then can ignore this Frame.
Said method can be applied to remote control field, such as controlling the aircraft such as such as unmanned plane, namely above-mentioned radio data transmission method is utilized to carry out transmitting control data, wherein first terminal is such as user side, second terminal is such as aircraft controlled end, control data and above-mentioned private information, the Payload of control data is usually less, within its data volume is preferably 1-32 byte, the steering order that can be user side send to aircraft or the response message that aircraft sends to user side.
For aircraft, particularly unmanned vehicle, because it is by the control of remote terminal, so flying distance is controlled the restriction of terminal control scope.Control terminal adopts said method control information transmission, can improve the transfer efficiency of control information, expands the flight range of aircraft.Because the information payload controlling class is all fewer, so can be transmitted by link layer, the redundancy of information can be reduced thus, and make full use of link layer data frame, improve the transfer efficiency of control information, even if when aircraft away from control device or channel disturbance larger, utilize such scheme still can complete the transmission work of control information.And owing to not needing to utilize application layer transmitting control data, so do not need to use complicated application program, the object reducing hardware cost can also be reached thus.
Above-mentioned user side can be that telepilot or intelligent terminal are as mobile phone, panel computer equal controller.The steering order that user side sends, such as advance, retreat, rise, decline, hover, roll, the steering order such as pitching or landing.This steering order is encapsulated in management frames as private information by user side, and by link layer, this management frames is sent to unmanned plane, unmanned plane is by link layer receiving management frame, and extract private information by the method in previous embodiment, and response message also can be encapsulated in management frames as private information by unmanned plane, and by link layer by this management frames transmission control device.
Above-mentioned private information can comprise information prefix and private message, private message is concrete steering order, according to the content of described information prefix, controlled end on unmanned plane can judge whether this management frames is that corresponding user side sends, only have and just obtain concrete steering order when information prefix is equal with preset value, the program can avoid aircraft to be subject to the interference of the management frames that other-end sends, and improves the security of aircraft.
Second embodiment of the invention provides a kind of wireless data transmission device, this application of installation comprising in first terminal (such as transmitting terminal): transmitting element, for sending management frames by link layer, described management frames is made up of cordless communication network protocol header, private information and check bit.
Second embodiment of the invention also provides a kind of wireless data transmission device, this application of installation comprising in the second terminal (such as receiving end): receiving element, for passing through link layer receiving management frame, described management frames is made up of cordless communication network protocol header, private information and check bit.
The wireless data transmission device that the embodiment of the present invention provides can by link layer transfer private information, reduce the redundancy of the communication information, improve the transfer efficiency of private information, even if when communicating the distant of two ends or channel disturbance is larger, utilize such scheme still can complete the transmission work of private information.
In order to the identity of distinguishing terminal, described private information can comprise message prefix and private message, and such as described private message is 1-32 byte.Described second terminal can also comprise:
Judging unit, for judging whether the information prefix in described private information equals preset value;
Acquiring unit, for when described information prefix equals preset value, obtains the private message in described private information.
Above-mentioned management frames can be Wi-Fi management frames, described Wi-Fi management frames comprise in beacon frame, explore frame, authentication frame, protocol frame any one.
Said apparatus can be applied to remote control field, such as controlling the aircraft such as such as unmanned plane, namely above-mentioned wireless data transmission device is utilized to carry out transmitting control data, control data and above-mentioned private information, the steering order that can be control device send to aircraft or the response message that aircraft sends to control device, the Payload of control data is usually less, within its data volume is preferably 1-32 byte.Above-mentioned first terminal can be user side, and above-mentioned second terminal can be aircraft.For aircraft, particularly unmanned vehicle, because it is by the control of remote terminal, so flying distance is controlled the restriction of terminal control scope.Control terminal adopts said method control information transmission, expands the flight range of aircraft.
Because the information payload controlling class is all fewer, so can be transmitted by link layer, the redundancy of information can be reduced thus, and do not need the process of establishing waiting for communication link, do not need to use application layer transmission data, make full use of link layer data frame, improve the transfer efficiency of control information yet, even if when aircraft away from control device or channel disturbance larger, utilize such scheme still can complete the transmission work of control information.And owing to not needing to utilize application layer transmitting control data, so do not need to use complicated application program, the object reducing hardware cost can also be reached thus.
Above-mentioned user side can be that telepilot or intelligent terminal are as mobile phone, panel computer equal controller.The steering order that user side sends, such as advance, retreat, rise, decline, hover, roll, the steering order such as pitching or landing.This steering order is encapsulated in management frames as private information by user side, and by link layer, this management frames is sent to unmanned plane, unmanned plane is by link layer receiving management frame, and extract private information by the method in previous embodiment, and response message also can be encapsulated in management frames as private information by unmanned plane, and by link layer by this management frames transmission control device.
Above-mentioned private information can comprise information prefix and private message, private message is concrete steering order, according to the content of described information prefix, controlled end on unmanned plane can judge whether this management frames is that corresponding user side sends, only have and just obtain concrete steering order when information prefix is equal with preset value, the program can avoid aircraft to be subject to the interference of the management frames that other-end sends, and improves the security of aircraft.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (14)
1. a radio data transmission method, is characterized in that, comprising: send management frames by link layer, and described management frames is made up of cordless communication network protocol header, private information and check bit.
2. radio data transmission method according to claim 1, is characterized in that, described private information comprises message prefix and private message.
3. a radio data transmission method, is characterized in that, comprising: by link layer receiving management frame, described management frames is made up of cordless communication network protocol header, private information and check bit.
4. radio data transmission method according to claim 3, is characterized in that, described by link layer receiving management frame after also comprise:
Judge whether the information prefix in described private information equals preset value;
When described information prefix equals preset value, obtain the private message in described private information.
5. the radio data transmission method according to claim 2 or 4, is characterized in that, described private message is 1-32 byte.
6. the radio data transmission method according to any one of claim 1-4, is characterized in that, described management frames is Wi-Fi management frames, described Wi-Fi management frames comprise in beacon frame, explore frame, authentication frame, protocol frame any one.
7. a wireless data transmission device, is characterized in that, comprising: transmitting element, and for sending management frames by link layer, described management frames is made up of cordless communication network protocol header, private information and check bit.
8. wireless data transmission device according to claim 7, is characterized in that, described private information comprises message prefix and private message.
9. a wireless data transmission device, is characterized in that, comprising: receiving element, and for passing through link layer receiving management frame, described management frames is made up of cordless communication network protocol header, private information and check bit.
10. wireless data transmission device according to claim 9, is characterized in that, also comprises:
Judging unit, for judging whether the information prefix in described private information equals preset value;
Acquiring unit, for when described information prefix equals preset value, obtains the private message in described private information.
Wireless data transmission device described in 11. according to Claim 8 or 10, is characterized in that, described private message is 1-32 byte.
12. wireless data transmission devices according to any one of claim 7-11, it is characterized in that, described management frames is Wi-Fi management frames, described Wi-Fi management frames comprise in beacon frame, explore frame, authentication frame, protocol frame any one.
13. 1 kinds of flying vehicles control methods, is characterized in that, utilize the radio data transmission method described in any one of claim 1-6 to carry out transmitting control data.
14. 1 kinds of flying vehicles control devices, is characterized in that, utilize the wireless data transmission device described in any one of claim 7-12 to carry out transmitting control data.
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| CN106814742A (en) * | 2016-12-29 | 2017-06-09 | 湖南创动智能科技有限公司 | A kind of control method of unmanned plane, control device and unmanned plane |
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| CN108513696A (en) * | 2017-03-21 | 2018-09-07 | 深圳市大疆创新科技有限公司 | Unmanned aerial vehicle (UAV) control method and control device, unmanned plane monitoring and managing method and monitoring equipment |
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| CN110337103A (en) * | 2019-05-28 | 2019-10-15 | 杭州安恒信息技术股份有限公司 | A kind of connectionless data hided transmission method based on 802.11 agreements |
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