CN104618019A - WiFi (wireless fidelity) access system based on visible light transmission and data frame transformation method - Google Patents
WiFi (wireless fidelity) access system based on visible light transmission and data frame transformation method Download PDFInfo
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Abstract
The invention discloses a WiFi access system based on visible light transmission. The WiFi access system based on visible light transmission comprises a light-Ethernet adapter and a light-WiFi router, wherein the light-Ethernet adapter comprises an Ethernet access controller and a first visible light transceiver module, wherein the Ethernet access controller is connected to the Internet and is also connected to the first visible light transceiver module through twisted pair cables; the light-WiFi router comprises a WiFi access controller and a second visible light transceiver module, wherein the second visible light transceiver module is connected with the WiFi access controller through twisted pair cables; the first visible light transceiver module and the second visible light transceiver module are connected through visible light transmission.
Description
Technical field
The present invention relates to a kind of WiFi connecting system based on visible light communication and this intrasystem Frame conversion method, belong to the local area network communication field in the communication technology.
Background technology
As everyone knows, visible ray radio communication have that frequency spectrum resource is abundant, good confidentiality, green safety, without the need to advantages such as licences.But, in order to realize " LiFi " (Light Fidelity) truly, require that each subscriber terminal equipment is furnished with visible ray wireless transmitter, as LED, optical signal detector etc., also have very long a period of time apart from this realization at present.
Need be connected to fixing ethernet port by wired mode during current configuration WiFi router, its mobility is lower, have impact on flexibility during WiFi configuration of routers.
Summary of the invention
Goal of the invention: the object of the present invention is to provide a kind of WiFi access device based on visible ray radio communication, be intended to the inconvenience that need be connected to fixing ethernet port when solving current configuration WiFi router by wired mode, improve flexibility during WiFi configuration of routers.
Technical scheme: the WiFi connecting system based on visible light communication of the present invention, comprise light-Ethernet Adaptation Unit and light-WiFi router, described light-Ethernet Adaptation Unit comprises Ethernet access controller and the first visible ray transceiver module, described Ethernet access controller is connected to internet, described Ethernet contactor controller is also by twisted pair line connection extremely described first visible ray transceiver module, described light-WiFi router comprises WiFi access controller and the second visible ray transceiver module, described second visible ray transceiver module is interconnected by twisted-pair feeder and described WiFi access controller, described first visible ray transceiver module is connected by visible light communication with between the second visible ray transceiver module.
Further, described Ethernet access controller also comprises Frame modular converter and frame buffering error control module, described Internet connection is to described Frame modular converter, described frame buffering error control module is connected to described first visible ray transceiver module, and described Frame modular converter and frame buffering error control module are interconnected.
Further, described WiFi access controller comprises WiFi access module, Frame modular converter and frame buffering error control module, described Frame modular converter and frame buffering error control module are interconnected, and described frame buffering error control module is connected to WiFI access module and the second visible ray transceiver module respectively by twisted-pair feeder.
Further, described first sees that optical transceiver module comprises the first transmitter and the first receiver, the second visible ray transceiver module comprise the second transmitter and the second receiver, described first transmitter sends a signal to described second receiver, and described second transmitter sends a signal to described first receiver.
Further, it is characterized in that, described first optical transceiver module and the second optical transceiver module are oppositely arranged.
Further, it is characterized in that, described frame buffering error control module comprises two transmitting-receiving buffer queues.
The present invention also comprises the frame conversion method of the Frame modular converter of above-mentioned arbitrary described WiFi connecting system based on visible light communication, comprises the following steps:
1) receiving data frames, reads the length n of receiving data frames;
2) if n is less than or equal to 559 bytes, then step 3 is performed), if n is greater than 559 bytes, then perform step 4);
3) Frame stem is formed an optical link frame, flag is 0x01, stored in transmission buffer queue, returns step 1);
4) if n is less than or equal to 1118 bytes, this performs step 5); If n is greater than 1118 bytes, this performs step 6);
5) Frame stem is formed two optical link frames, flag is respectively 0x41 and 0x81, stored in transmission buffer queue, returns step 1);
6) Frame is added three frame stems form three optical link frames, flag is respectively 0x41,0xc1 and 0x81, stored in transmission buffer queue, returns step 1).
The present invention also comprises the frame conversion method of the Frame modular converter of above-mentioned arbitrary described WiFi connecting system based on visible light communication, comprises the following steps:
1) check receiving cache queue, if there is frame to exist, just the optical link frame of queue head is taken out;
2) judge that whether this frame is continuous with previous frame.If continuously, then put global variable suc=1, otherwise, put suc=0;
3) value of judgment frame stem flag field, if 0x01, then performs step 4); If flag is 0x41, then perform step 5); If flag is 0xc1, then perform step 6); If flag is 0x81, then perform step 7);
4) this optical link frame can form a complete ether/Wifi frame, and the variable discard putting program is 0, shows that this frame is not dropped, and then, by the dataframe after reduction to Ethernet/WiFi network, returns step 1);
5) this optical link frame is first segmentation of a complete Ether frame, also need below to connect other segmentation, the reserved buffer send_buff the side-play amount first data division of this optical link frame being copied to described frame buffering error control module is the position of 0, juxtaposition variable discard=0, m=559, returns step 1);
6) this optical link frame need form an ether/Wifi frame with its former and later two continuous print frames.First whether judgment variable suc equals 1, if not, then put discard=1, illustrate that this frame is dropped; Otherwise putting discard is 0, and the reserved buffer send_buff side-play amount data division of this frame being copied to described frame buffering error control module is the position of 559 bytes, and makes m=559*2, returns step 1);
7) this optical link frame is last segmentation of a complete ether/Wifi frame, and needs above to connect other segmentation.First, judge this frame whether continuously (suc=1) and former frame be not dropped (discard=0), if so, then in front of the frame in face form an ether/Wifi frame together, and be sent to Ethernet/WiFi network; Otherwise directly putting discard is 0, is equivalent to abandon whole ether/Wifi frame, returns step 1).
The present invention compared with prior art, its beneficial effect is: the WiFi access device based on visible ray radio communication that the present invention proposes, advantage need be connected to the inconvenience of fixing ethernet port by wired mode when being that of avoiding WiFi configuration of routers, improve flexibility during configuration of routers.
Accompanying drawing explanation
Fig. 1 is the structural schematic block diagram of the WiFi connecting system that the present invention is based on visible light communication;
Fig. 2 is the setting position schematic block diagram of the WiFi connecting system that the present invention is based on visible light communication;
Fig. 3 ether/Wifi frame of the present invention is converted to the flow chart of optical-fiber network frame,
Fig. 4 optical-fiber network frame is converted to the flow chart of ether/Wifi frame.
Embodiment
Below technical solution of the present invention is described in detail, but protection scope of the present invention is not limited to described embodiment.
Embodiment 1:
Visible ray radio communication combines with WiFi technology by the present invention, visible light communication link is inserted by accessing between side and Ethernet access side at WiFi, propose a kind of WiFi access device based on visible ray radio communication, comprise light-Ethernet Adaptation Unit and light-WiFi router two equipment, specifically comprise again:
An Ethernet access controller 1, this access controller is connected with external network by RJ45 twisted-pair feeder, it comprises a Frame modular converter 4 and a frame buffer module 5, be connected with the first visible ray transceiver module 3 by RJ45 twisted-pair feeder, form light-Ethernet Adaptation Unit together with this first visible ray transceiver module 3;
First visible ray transceiver module 3, comprises the first transmitter 8 and the first receiver 9.Second visible ray transceiver module 10 comprises the second transmitter 11 and the second receiver 12. wherein equally, the built-in LED of transmitter, light that LED sends forms visible light communication link, and this visible ray transceiver module completes the synthesis of light signal, modulation, transmission and reception, demodulation, parsing;
A WiFi access controller 2, this access controller, except comprising a Frame modular converter 13 and a frame buffer module 14, also comprises a WiFi access module 6, and it is connected with the above two by RJ45 twisted-pair feeder; In addition, this WiFi access controller 6 is also connected with the second visible ray transceiver module 10, and the two forms light-WiFi router together.
In such scheme, the 26S Proteasome Structure and Function of two described visible ray transceiver modules is all reciprocity, all comprises transmitter and receiver, wherein, and the built-in LED of transmitter and radiating circuit; Receiver comprises the receiving circuit detecting light signal and process.
In such scheme, a light-WiFi router and a light-Ethernet Adaptation Unit supporting, the visible ray transceiver module in the two relatively, ensures that the light that the LED of a side sends can be received by the optical signal detector of the other side on locus.
In such scheme, the Frame modular converter in described Ethernet access controller and WiFi access controller and the 26S Proteasome Structure and Function of frame buffer module are all reciprocity.
In such scheme, Frame modular converter completes the conversion of data frame format between networks of different protocol, mainly comprises the frame format conversion between the conversion of the frame format between Ethernet-optical-fiber network and WiFi network-optical-fiber network; Wherein, the Frame in optical-fiber network is fixed as 564 byte lengths, and frame stem takies 5 bytes, comprises frame number 2 bytes, segmentation marker 1 byte and data length 2 bytes three fields, and except frame stem, 559 remaining bytes are data field; The Frame of Ethernet or WiFi network, after being converted to optical-fiber network frame format, if need fill out 0 polishing less than 564 bytes, if exceeded, needs to be split into two frames or three frames, and the last frame less than 564 bytes is by filling out 0 polishing.
In such scheme, frame buffer module comprises two sending and receiving buffer queues, from the Frame of Ethernet or WiFi network after converting optical-fiber network frame to by Frame modular converter, stored in transmission buffer queue, be removed one by one and be sent to visible ray transceiver module, namely deleting from transmission buffer queue once send; After opposite end receives optical-fiber network frame from visible ray transceiver module, by it stored in receiving cache queue, the optical-fiber network frame sent in buffer queue is then reverted to Ether frame or Wifi frame by Frame modular converter.
In such scheme, WiFi access module in WiFi access controller, side provides RJ45 interface to be connected with Frame modular converter and frame buffer module, and opposite side produces WiFi signal, signal controlling when realizing multiple access by soft AP, management and transfer of data.
In such scheme, the signal of telecommunication is modulated by the transmitter in visible ray transceiver module, and is converted to light signal and is sent in optical link and transmits; Receiver in the visible ray transceiver module of opposite end, after detection, receiving light signal, is converted into the signal of telecommunication and completes demodulation.
As shown in Figure 1, WiFi access device based on visible ray radio communication is made up of light-Ethernet Adaptation Unit and light-WiFi router two equipment, specifically comprise: an Ethernet access controller, this access controller is connected with external network by RJ45 twisted-pair feeder, it comprises a Frame modular converter and a frame buffer module, be connected with a visible ray transceiver module by RJ45 twisted-pair feeder, form light-Ethernet Adaptation Unit together with this visible ray transceiver module; Two visible ray transceiver modules, comprise transmitter and receiver, wherein, the built-in LED of transmitter, light that LED sends forms visible light communication link, and this visible ray transceiver module completes the synthesis of light signal, modulation, transmission and reception, demodulation, parsing; A WiFi access controller, this access controller, except comprising a Frame modular converter and a frame buffer module, also comprises a WiFi access module, and it is connected with the above two by RJ45 twisted-pair feeder; In addition, this WiFi access controller is also connected with another visible ray transceiver module, and the two forms light-WiFi router together.
As accompanying drawing 1, shown in 2, its operation principle is as follows: first subscriber equipment searches the WiFi signal that light-WiFi router sends, and completes certification with router and associate; Then, the Frame that subscriber equipment is sent by the WiFi access module of WiFi access controller is transmitted to Frame modular converter and frame buffer module by iptables/netfilter packet filtering system through Ethernet interface, Wifi frame dismounting is become the optical link frame of regular length, transfer to the process of visible ray transceiver module afterwards, data flow is transmitted by certain modulation system on optical link; The visible ray transceiver module of opposite end receives data and after suitable demodulation, recover the optical link frame of making a start and sending, transfer to Frame modular converter and the process of frame buffer module on upper strata again, reformulate Ether frame, and it is sent from Ethernet interface, thus the data interaction of completing user equipment and external network.Reverse link communication process is similar.
Wherein, a light-WiFi router and a light-Ethernet Adaptation Unit match, and it is moveable; The 26S Proteasome Structure and Function of the visible ray transceiver module of the two the inside is consistent, all comprises transmitter and receiver, wherein, and the built-in LED of transmitter and radiating circuit; Receiver comprises the receiving circuit detecting light signal and process.As Fig. 2, in specific implementation process, light-WiFi router is relative on locus with the visible ray transceiver module in light-Ethernet Adaptation Unit, to ensure that the light that the LED of a side sends can be received by the optical signal detector of the other side.
As shown in Figure 1, the Frame modular converter in Ethernet access controller and WiFi access controller and the 26S Proteasome Structure and Function of frame buffer module are all reciprocity.WiFi access module in WiFi access controller, side provides RJ45 interface to be connected with Frame modular converter and frame buffer module, and opposite side produces WiFi signal, signal controlling when realizing multiple access by soft AP, management and transfer of data.
For Frame modular converter, it completes the conversion of data frame format between networks of different protocol, mainly comprises the frame format conversion between the conversion of the frame format between Ethernet-optical-fiber network and WiFi network-optical-fiber network; Wherein, the Frame in optical-fiber network is fixed as 564 byte lengths, and frame stem takies 5 bytes, comprises frame number 2 bytes, segmentation marker 1 byte and data length 2 bytes three fields.Because the length of Ether frame is between 64 ~ 1518 bytes, and the MTU of WiFi network is designated as 1500 bytes, and therefore, any Ether frame or the most multipotency of Wifi frame split into 3 optical link frames.Each optical link frame corresponds to a frame number SN, and it circulates value between 0 ~ 4095.Segmentation marker takies a byte, only uses its highest two f7f6, and remaining, for retaining position, is taken as 000001.Wherein, f7 represents that whether will connect other optical link frame before this frame forms an Ether frame; F6 then represents below whether also needing to connect other optical link frame and forming an Ether frame of this frame.Except frame stem, 559 remaining bytes are data field, the Frame of Ethernet or WiFi network after being converted to optical-fiber network frame, if 0 polishing need be filled out less than 564 bytes, if exceeded, need to be split into two frames or three frames, the last frame less than 564 bytes is by filling out 0 polishing.The data length field of frame stem is then for the actual Ether frame length comprised of record data field.
For frame buffer module, it comprises two sending and receiving buffer queues, from the Frame of Ethernet or WiFi network after converting optical-fiber network frame to by Frame modular converter, stored in transmission buffer queue, be removed one by one and be sent to visible ray transceiver module, namely deleting from transmission buffer queue once send; After opposite end receives optical-fiber network frame from visible ray transceiver module, by it stored in receiving cache queue, the optical-fiber network frame sent in buffer queue is then reverted to Ether frame or Wifi frame by Frame modular converter.
Based on above-mentioned embodiment, provide the workflow of Frame modular converter and frame buffer module below.
As shown in Figure 3, suppose that the length of the Ether frame that the Frame modular converter of making a start receives or Wifi frame is n byte.If n is not more than 559 bytes, illustrate that this frame is without the need to splitting, and only need add that frame stem forms optical link frame and puts into receiving cache queue; If 559<n≤1118 or n>1118, then need to be split as two or three optical link frames respectively, the value rule of its segmentation marker as previously described.
As shown in Figure 4, at receiving terminal, as long as there is frame to exist in receiving cache queue, just taken out and judged whether with previous frame continuous, in order to detect whether frame losing.If continuously, then succ=1; Otherwise, succ=0.Then, judge the value of segmentation marker field flag, if 0x01, illustrate that this optical link frame can form a complete ether/Wifi frame, put discard and be masked as 0, show that this frame is not dropped, and the frame after reduction is dealt into WiFi network or external network; If flag is 0x41, then show that this frame is first segmentation of a complete ether/Wifi frame, after also need to connect other segmentation, first copying the data division of this optical link frame to reserved buffer send_buff side-play amount is the position of 0, and makes discard=0; If flag is 0xc1, illustrate that this frame need form an ether/Wifi frame with its former and later two continuous print frames, first judge whether suc equals 1, if not, then put discard=1, illustrate that this frame is dropped, otherwise, putting discard is 0, and copies the data division of frame to position that send_buff side-play amount is 559 bytes; If flag is 0x81, illustrate that this frame is last segmentation of a complete ether/Wifi frame, and need above to connect other segmentation, first, judge this frame whether continuously and former frame be not dropped, if, then, the frame in face forms an ether/Wifi frame together, and is sent to WiFi network or external network, otherwise, directly putting discard is 0, is equivalent to abandon whole ether/Wifi frame.
As mentioned above, although represented with reference to specific preferred embodiment and described the present invention, it shall not be construed as the restriction to the present invention self.Under the spirit and scope of the present invention prerequisite not departing from claims definition, various change can be made in the form and details to it.
Claims (8)
1. the WiFi connecting system based on visible light communication, it is characterized in that, comprise light-Ethernet Adaptation Unit and light-WiFi router, described light-Ethernet Adaptation Unit comprises Ethernet access controller (1) and the first visible ray transceiver module (3), described Ethernet access controller (1) is connected to internet, described Ethernet access controller (1) is also by twisted pair line connection extremely described first visible ray transceiver module (3), described light-WiFi router comprises WiFi access controller (2) and the second visible ray transceiver module (10), described second visible ray transceiver module (10) is interconnected by twisted-pair feeder and described WiFi access controller (2), described first visible ray transceiver module (3) is connected by visible light communication with between the second visible ray transceiver module.
2. the WiFi connecting system based on visible light communication according to claim 1, it is characterized in that, described Ethernet access controller also comprises Frame modular converter (4) and frame buffering error control module (5), described Internet connection is to described Frame modular converter (4), described frame buffering error control module (5) is connected to described first visible ray transceiver module (3), and described Frame modular converter (4) and frame buffering error control module (5) are interconnected.
3. the WiFi connecting system based on visible light communication according to claim 1, it is characterized in that, described WiFi access controller (2) comprises WiFi access module (6), Frame modular converter (13) and frame buffering error control module (14), described Frame modular converter (13) and frame buffering error control module (14) are interconnected, and described frame buffering error control module (14) is connected to WiFi access module (6) and the second visible ray transceiver module (10) respectively by twisted-pair feeder.
4. according to the arbitrary described WiFi connecting system based on visible light communication of claims 1 to 3, it is characterized in that, described first sees that optical transceiver module (3) comprises the first transmitter (8) and the first receiver (9), the second visible ray transceiver module comprise the second transmitter (11) and the second receiver (12), described first transmitter (8) sends a signal to described second receiver (12), and described second transmitter (12) sends a signal to described first receiver (9).
5., according to the arbitrary described WiFi connecting system based on visible light communication of claims 1 to 3, it is characterized in that, described first optical transceiver module (3) and the second optical transceiver module (10) are oppositely arranged.
6. according to the arbitrary described WiFi connecting system based on visible light communication of claim 2 ~ 3, it is characterized in that, described frame buffering error control module (5,14) comprises two transmitting-receiving buffer queues.
7., according to the frame conversion method of the Frame modular converter of the arbitrary described WiFi connecting system based on visible light communication of claim 2 ~ 3, it is characterized in that, comprise the following steps:
1) receiving data frames, reads the length n of receiving data frames;
2) if n is less than or equal to 559 bytes, then step 3 is performed), if n is greater than 559 bytes, then perform step 4);
3) Frame is added frame stem forms an optical link frame, wherein, the flag field of frame stem is 0x01, stored in transmission buffer queue, returns step 1);
4) if n is less than or equal to 1118 bytes, then step 5 is performed); If n is greater than 1118 bytes, then perform step 6);
5) Frame stem is formed two optical link frames, flag is respectively 0x41 and 0x81, stored in transmission buffer queue, returns step 1);
6) Frame is added three frame stems form three optical link frames, flag is respectively 0x41,0xc1 and 0x81, stored in transmission buffer queue, returns step 1).
8., according to the frame conversion method of the Frame modular converter of the arbitrary described WiFi connecting system based on visible light communication of claim 2 ~ 3, it is characterized in that, comprise the following steps:
1) check receiving cache queue, if there is frame to exist, just the optical link frame of queue head is taken out;
2) judge that whether this frame is continuous with previous frame, if continuously, then put global variable suc=1, otherwise, put suc=0;
3) value of judgment frame stem flag field, if 0x01, then performs step 4); If flag is 0x41, then perform step 5); If flag is 0xc1, then perform step 6); If flag is 0x81, then perform step 7);
4) the variable discard putting program is 0, shows that this frame is not dropped, and then, by the dataframe after reduction to Ethernet/WiFi network, returns step 1);
5) the reserved buffer send_buff the side-play amount first data division of this optical link frame being copied to described frame buffering error control module is the position of 0, juxtaposition variable discard=0, and m=559, returns step 1);
6) first judge whether suc equals 1, if not, then put discard=1, illustrate that this frame is dropped; Otherwise putting discard is 0, and the reserved buffer send_buff side-play amount data division of this frame being copied to described frame buffering error control module is the position of 559 bytes, and makes m=559*2, returns step 1);
7) first, judge that this frame is whether continuous, i.e. whether suc=1, and former frame is not dropped, i.e. whether discard=0, if so, then in front of the frame in face form an ether/Wifi frame together, and be sent to Ethernet/WiFi network; Otherwise directly putting discard is 0, is equivalent to abandon whole ether/Wifi frame, returns step 1).
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| CN107276670B (en) * | 2017-05-02 | 2019-08-02 | 南京邮电大学 | A kind of environmental monitoring intelligence visible light communication system and method |
| CN109450535A (en) * | 2018-11-16 | 2019-03-08 | 广东工业大学 | A kind of wireless communications method based on visible light and radio-frequency technique |
| CN112152705A (en) * | 2019-06-28 | 2020-12-29 | Oppo广东移动通信有限公司 | Data transmission method, device, storage medium and electronic equipment |
| WO2020259344A1 (en) * | 2019-06-28 | 2020-12-30 | Oppo广东移动通信有限公司 | Data transmission method and apparatus, storage medium and electronic device |
| CN116567753A (en) * | 2023-07-06 | 2023-08-08 | 深圳智慧光迅信息技术有限公司 | Wireless roaming method, system, computer equipment and storage medium |
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Application publication date: 20150513 |