CN104202088A - Visible light communication method and visible light communication device - Google Patents
Visible light communication method and visible light communication device Download PDFInfo
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- CN104202088A CN104202088A CN201410478111.3A CN201410478111A CN104202088A CN 104202088 A CN104202088 A CN 104202088A CN 201410478111 A CN201410478111 A CN 201410478111A CN 104202088 A CN104202088 A CN 104202088A
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Abstract
An embodiment of the invention provides a visible light communication method and a visible light communication device. The visible light communication method includes searching at least one second visible light communication facility corresponding to at least one first visible light communication facility in response to forwarding requests from the first visible light communication facilities; searching at least one second visible light communication facility corresponding to the first visible light communication facilities in response to cover ranges of forwarding facilities, and distributing respective visible light transceivers to each first visible light communication facility and each second visible light communication facility according to visual fields of respective visible light transceivers of the forwarding facilities. The forwarding requests are received by the forwarding facilities. The visible light communication method and the visible light communication device in various embodiments of the invention have the advantages that at least two forwarding facilities are used as relays between the visible light communication facilities under non-line-of-sight transmission conditions, the respective visible light transceivers are distributed to each two corresponding communication parties, and accordingly visible light communication can be implemented under the non-line-of-sight transmission conditions in the maximum cover ranges.
Description
Technical field
Each embodiment of the application relates to visible light communication technical field, relates in particular to a kind of visible light communication method and visible light communication device.
Background technology
Visible light communication (VLC) is to utilize the high speed light and shade blinking light being invisible to the naked eye to carry out the technology of the wireless light communication of transmission information.This technology provides to the access of the unlicensed spectrum of hundreds of THz, to the vulnerability to jamming of electromagnetic interference and non-interference with radio frequency (RF) system.VLC technology also sees that by permission user signal transmission provides added security, and provides for example, strengthening and supplementary communicating by letter from the existing service of visible ray infrastructure (, illumination, demonstration, indication, decoration etc.).
Visible light communication equipment can comprise visible ray transceiver, modulating-coding module, demodulating and decoding module etc.Visible ray transceiver is realized the reception of light signal by for example light-sensitive device, realize the transmission of light signal by fluorescent lamp or light-emitting diode (LED).Take LED as example, and because it has the limited visual field (Field of View, FOV), the sight line between two visible ray transceivers (Line of Sight, LOS) communication just forms the great majority application in visible light communication system.Preferably LOS link is because visible ray cannot pass through opaque obstacle, such as wall.As shown in Figure 1, due to the obstruction of wall 13, LED 11 and LED12 are under non-line-of-sight transmission condition, and the visible light communication between the two will be obstructed, and may cause visible light communication cannot realize or burst frame error frequently.
Summary of the invention
In view of this, the embodiment of the present application object is to provide the visible light communication scheme under a kind of non-line-of-sight transmission condition.
For achieving the above object, according to the first aspect of the embodiment of the present invention, provide a kind of visible light communication method, described method comprises:
In response to forwarding unit, receive the Forward-reques from least one the first visible light communication equipment, search at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment;
In response to find at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment in the coverage of described forwarding unit, according to the visual field of each visible ray transceiver of described forwarding unit, be the first visible light communication equipment described in each and the second visible light communication devices allocation visible ray transceiver separately described in each.
According to the second aspect of the embodiment of the present invention, a kind of visible light communication device is provided, described device comprises:
One searches module, for receive the Forward-reques from least one the first visible light communication equipment in response to forwarding unit, searches at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment;
One distribution module, for finding at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment in response to the described module of searching in the coverage of described forwarding unit, according to the visual field of each visible ray transceiver of described forwarding unit, be the first visible light communication equipment described in each and the second visible light communication devices allocation visible ray transceiver separately described in each.
The method of the embodiment of the present application and device by using comprise at least two visible ray transceivers forwarding unit as the relaying between the visible light communication equipment under non-line-of-sight transmission condition, and for communicating pair distributes visible ray transceiver separately, can realize the visible light communication under the non-line-of-sight transmission condition in maximum area coverage.
Accompanying drawing explanation
Fig. 1 is non-line-of-sight transmission scene schematic diagram;
Fig. 2 is the flow chart of the visible light communication method of the embodiment of the present application;
Fig. 3 is a kind of possible scene schematic diagram of realizing the visible light communication under non-line-of-sight transmission condition by forwarding unit;
Fig. 4 (a) to Fig. 4 (b) be the another kind of possible scene schematic diagram of realizing the visible light communication under non-line-of-sight transmission condition by forwarding unit;
Fig. 5 is the structural representation of the first implementation of the visible light communication device of the embodiment of the present application;
Fig. 6 is the structural representation of a kind of possible implementation of searching module of the visible light communication device of the embodiment of the present application;
Fig. 7 is the structural representation of the second implementation of the visible light communication device of a kind of embodiment of the application;
Fig. 8 is the structural representation of a kind of possible implementation of distribution module of the visible light communication device of a kind of embodiment of the application;
Fig. 9 is the structural representation of a kind of possible implementation of the second allocation units in the distribution module of visible light communication device of a kind of embodiment of the application;
Figure 10 is the structural representation of a kind of possible implementation of the first allocation units in the distribution module of visible light communication device of a kind of embodiment of the application;
Figure 11 is the structural representation of the third implementation of the visible light communication device of a kind of embodiment of the application;
Figure 12 is the structural representation of the 4th kind of implementation of the visible light communication device of a kind of embodiment of the application;
Figure 13 is the structural representation of the visible light communication device of the another kind of embodiment of the application.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
It will be understood by those skilled in the art that the terms such as " first " in the application, " second ", only for distinguishing distinct device, module or parameter etc., neither represent any particular technology implication, also do not represent the inevitable logical order between them.
In addition, in each embodiment of the application, described " forwarding unit ", for having the equipment of visible ray transmission-receiving function, in order to set up/continue the visible light communication being obstructed between the first visible light communication equipment and the second visible light communication equipment, described forwarding unit serves as the relaying between communicating pair.And in each embodiment of the application, " forwarding unit " is and the visible light communication equipment of the first visible light communication equipment under line-of-sight transmission condition, it has at least two visible ray transceivers, each visible ray transceiver comprises a LED, all visible ray transceivers share or have respectively a light-sensitive device, the larger coverage that such equipment obtains the visual field stack with each LED, for example, if forwarding unit has two LED that comprise 30 ° of visuals field, this forwarding unit is by the coverage with maximum 60 °; If forwarding unit has four LED that comprise 30 ° of visuals field, this forwarding unit is by the coverage with maximum 120 °, use such forwarding unit as the relaying of the visible light communication in each embodiment of the application, can realize the visible light communication under wider non-line-of-sight transmission condition.The first visible light communication equipment and/or the second visible light communication equipment also can comprise a more than visible ray transceiver.Forwarding unit, the first visible light communication equipment and the second corresponding visible light communication equipment that can realize visible light communication are hereinafter called visible light communication system.
The visible light communication method of the embodiment of the present application can be carried out by the device being independent of or belong to forwarding unit.As shown in Figure 2, the visible light communication method of the embodiment of the present application comprises:
S220. in response to forwarding unit, receive the Forward-reques from least one the first visible light communication equipment, search at least one the second visible light communication equipment corresponding with described at least one the first visible light communication equipment.
In the method for the embodiment of the present application, the first visible light communication equipment cannot set up maybe cannot continue and the second visible light communication equipment between visible light communication time, also under non-line-of-sight transmission condition, can send Forward-reques, Forward-reques is for making suitable forwarding unit can serve as the role of relaying between the first visible light communication equipment and the second visible light communication equipment, and the first visible light communication equipment of forwarding is issued the light signal of the second visible light communication equipment.Described Forward-reques can send for the form by broadcast, to find possible forwarding unit in the visible ray transceiver visual field of the first visible light communication equipment.Described Forward-reques can be also that the mode by multicast or clean culture directionally sends to known possible forwarding unit.The executive agent of the method for the embodiment of the present application when forwarding unit receives described Forward-reques or afterwards, is searched the second corresponding visible light communication equipment according to described Forward-reques.
S240. in response to find at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment in the coverage of described forwarding unit, according to the visual field of each visible ray transceiver of described forwarding unit, be the first visible light communication equipment described in each and the second visible light communication devices allocation visible ray transceiver separately described in each.
In the method for the embodiment of the present application, the first visible light communication equipment that sends Forward-reques in the coverage of forwarding unit if do not find is wanted the second visible light communication equipment of communication, and described forwarding unit can not be as the relaying of the two subsequent communications; The the first visible light communication equipment that sends Forward-reques in the coverage of described forwarding unit if can find is wanted the second visible light communication equipment of communication, judges that described forwarding unit can be as the forwarding unit of the relaying of the two subsequent communications.Subsequently, according to the relative position relation between described the first visible light communication equipment and the second visible light communication equipment and described forwarding unit, or rather, which according to described the first visible light communication equipment and the second visible light communication equipment, lay respectively in the visual field as visible ray transceiver of the forwarding unit of relaying, for described the first visible light communication equipment and the second visible light communication devices allocation visible ray transceiver separately, what distribute to described the first visible light communication equipment and the second visible light communication equipment can be same visible ray transceiver, also can be different visible ray transceivers.
To sum up, the method of the embodiment of the present application by using comprise at least two visible ray transceivers forwarding unit as the relaying between the visible light communication equipment under non-line-of-sight transmission condition, and for communicating pair distributes visible ray transceiver separately, can realize the visible light communication under the non-line-of-sight transmission condition in maximum area coverage.
In a kind of possible implementation, described Forward-reques can be the request message of the identification information that only comprises the second visible light communication equipment, the data message that the object sending after request forwarding unit can forward is the second visible light communication equipment corresponding to this identification information.In another possible implementation, for example, in the scene of the known forwarding unit that can be used as relaying, described Forward-reques can be the data message of the identification information that destination address comprises the second visible light communication equipment.No matter, in which kind of implementation, can search the second corresponding visible light communication equipment according to described identification information.It should be noted that, forwarding unit this locality can store the relevant information of the visible light communication equipment in its coverage, therefore, can in the local canned data of forwarding unit, search described identification information, is also that step S220 can comprise:
S221. in described forwarding unit this locality, search described identification information, if find described identification information, show to exist corresponding the second visible light communication equipment in the coverage of forwarding unit.
If described forwarding unit this locality does not store corresponding identification information, also can in the coverage of described forwarding unit, search in the following manner described the second visible light communication equipment, be also that step S220 also can comprise:
S222. to described at least one the second visible light communication equipment corresponding to described identification information, send the light signal that comprises connection request.
Because forwarding unit comprises at least two visible ray transceivers, in order to search whole coverages of forwarding unit, all visible ray transceivers that can be by forwarding unit are respectively to the light signal that comprises connection request described in its sending within sweep of the eye separately.If there is the second visible light communication equipment corresponding with described identification information in the coverage of forwarding unit, the method for the embodiment of the present application also will comprise step:
S260. obtain the response to described connection request that described at least one the second visible light communication equipment sends.
The response to described connection request that the second visible light communication equipment corresponding to described identification information that forwarding unit receives if can get sends, can determine that described forwarding unit can be as the forwarding unit of relaying.Be each visible light communication devices allocation visible ray transceiver subsequently.
According to line-of-sight transmission condition, in a kind of possible implementation, the distribution of step S240 can comprise:
S242. by receiving described at least one visible ray transceiver to the response of described connection request, distribute to the second visible light communication equipment corresponding to described response.
For described forwarding unit, its visible ray transceiver that can receive described Forward-reques may more than one, but the not all visible ray transceiver that can receive Forward-reques is all suitable as the signal that relaying sends the first visible light communication equipment, is transmitted to the second visible light communication equipment.For example, in scene as shown in Figure 3, forwarding unit 30 is comprised of four visible ray transceivers, and the Forward-reques that the first visible light communication equipment 31 sends is by all four the visible ray transceivers 301,302 by its coverage, and 303,304 receive.But the restriction due to transmission conditions or hardware condition, the visible ray transceiver 301 that the second visible light communication equipment 32 can receive, 302, 303, the intensity of 304 light signals that send is different, even may all light signal can be sent to the second visible light communication equipment 32 by not all visible ray transceiver, as shown in Figure 3, the second visible light communication equipment 32 is not at visible ray transceiver 301, in 302 the visual field, so visible ray transceiver 301, 302 can not send to light signal the second visible light communication equipment 32, therefore, in order better to utilize system resource and to improve as far as possible communication quality, the higher corresponding visible ray transceiver of light signal of intensity that the second visible light communication equipment can be received is distributed to the second visible light communication equipment.Correspondingly, step S242 can comprise:
S2422. the intensity that comprises the light signal of connection request described in determining that described at least one the second visible light communication equipment receives that described forwarding unit sends.In a kind of possible implementation, this strength information can be included in that the second visible light communication equipment returns in the response of connection request.
S2424. according to the intensity that comprises the light signal of connection request described in receiving, be at least one visible ray transceiver described in described at least one the second visible light communication devices allocation.
Preferably, be the corresponding visible ray transceiver of light signal that the second visible light communication devices allocation signal strength signal intensity is the strongest.
Step S240 also can comprise:
S244. at least one visible ray transceiver that receives Forward-reques is distributed to the first visible light communication equipment that described Forward-reques is corresponding.
Similar with the second visible light communication equipment, for described forwarding unit, the visible ray transceiver to the response of described connection request that can receive the second visible light communication equipment may more than one, but not all visible ray transceiver is all suitable as the signal that relaying sends the second visible light communication equipment, is transmitted to the first visible light communication equipment.Still as shown in Figure 3, the response that the second visible light communication equipment 32 returns will be forwarded four visible ray transceivers 301,302 of equipment 30 to example, and 303,304 receive.But the restriction due to transmission conditions or hardware condition, the visible ray transceiver 301 that the first visible light communication equipment receives, 302, 303, the intensity of 304 light signals that send may be different, even may all light signal can be sent to the first visible light communication equipment 31 by not all visible ray transceiver, as shown in Figure 3, the first visible light communication equipment 31 is not at visible ray transceiver 303, in 304 the visual field, so visible ray transceiver 303, 304 can not send to light signal the first visible light communication equipment 31, therefore, in order better to utilize system resource and to improve as far as possible communication quality, the method of the embodiment of the present application is also the best visible ray transceivers of the first visible light communication devices allocation transmission conditions.Correspondingly, step S244 can comprise:
S2442. by the described at least one visible ray transceiver that receives Forward-reques, to described at least one the first visible light communication equipment, send test light signal.This test light signal is for determining that the first visible light communication equipment receives the intensity of this light signal and sends.
S2444. determine the intensity of the described test light signal that described at least one the first visible light communication equipment receives.In a kind of possible implementation, the first visible light communication equipment receives feedback light strength information after the light signal sending in step S2442.
S2446. according to the intensity of described light signal, be at least one visible ray transceiver described in described at least one the first visible light communication devices allocation.
Preferably, be the corresponding visible ray transceiver of light signal that the first visible light communication devices allocation signal strength signal intensity is the strongest.
It should be noted that, except being the first visible light communication equipment and the second visible light communication devices allocation visible ray transceiver by process recited above, forwarding unit this locality also can store the first visible light communication equipment, the second visible light communication equipment of specific relative position and can be the corresponding relation record of the visible ray transceiver of its distribution.Can carry out above-mentioned distribution with reference to this record of the local storage of described forwarding unit.
In addition,, in the method for the embodiment of the present application, position and/or the attitude of the first visible light communication equipment, the second visible light communication equipment and described forwarding unit all have the possibility changing.For example, three, appoint under one or more scene being moved, three's relative position relation changes, and script line-of-sight transmission condition between any two may change under non-line-of-sight transmission condition, thereby causes communication disruption.Again for example, if changing, forwarding unit attitude (rotates, etc.), the visual field of originally distributing to the visible ray transceiver of the first visible light communication equipment and/or the second visible light communication equipment may no longer can cover the first visible light communication equipment and/or the second visible light communication equipment, thereby causes communication disruption.Therefore,, in a kind of possible implementation, the method for the embodiment of the present application also can comprise:
S230. in response to described at least one the first visible light communication equipment, change with the relative position of corresponding visible ray transceiver, for described at least one the first visible light communication equipment is redistributed visible ray transceiver.Tool is sayed it, and described variation may make the first visible light communication equipment leave the visual field of the visible ray transceiver of distributing to it.The reason that causes this situation may be that the first visible light communication equipment is moved, or forwarding unit is moved and/or rotates.In this case, the method for the embodiment of the present application will be described the first visible light communication devices allocation visible ray transceiver again.And the method for the embodiment of the present application can be moved and make the judgement that described relative position changes according to the accidental interruption of the communication of well afoot or the first and/or second visible light communication equipment of learning.
In order to be the first visible light communication devices allocation visible ray transceiver again, the method for the embodiment of the present application also comprises:
S250. determine the position of described at least one the first visible light communication equipment.
In the method for the embodiment of the present application, described position can be the definite geographical location information of the first visible light communication equipment, also can be the relative position relation information of the first visible light communication equipment and forwarding unit, this relative position relation can be according to the location positioning of the first visible light communication equipment, and the accurate location of the first visible light communication equipment can send in the lump in sending described Forward-reques, or after being moved, the first visible light communication equipment informs the final controlling element of the method for the embodiment of the present application.In the possible implementation of fixing at a kind of the first visible light communication device location, in Forward-reques, also comprise the identification information of the first visible light communication equipment, forwarding unit this locality stores corresponding positional information, just can be from the local initial position of determining the first visible light communication equipment of forwarding unit according to this identification information.
Can be described the first visible light communication devices allocation visible ray transceiver again with the corresponding variation of visible ray transceiver relative position and the visual field of the visible ray transceiver of forwarding unit according to a position constantly on the first visible light communication equipment, the first visible light communication equipment.Because described variation may can't cause the second visible light communication equipment to leave the visual field of the visible ray transceiver of distributing to it, therefore, the possibility of result of redistributing was identical with the allocation result at upper a moment.
In the possible implementation of another kind, the method for the embodiment of the present application also can comprise:
S270. in response to described at least one the second visible light communication equipment, change with the relative position of corresponding visible ray transceiver, for described at least one the second visible light communication equipment is redistributed visible ray transceiver.Tool is sayed it, and described variation may make the second visible light communication equipment leave the visual field of the visible ray transceiver of the forwarding unit of distributing to it.The reason that causes this situation may be that the second visible light communication equipment is moved, or forwarding unit is moved and/or rotates.In this case, the method for the embodiment of the present application will be described the second visible light communication devices allocation visible ray transceiver again.And the method for the embodiment of the present application can be moved and make the judgement that described relative position changes according to the accidental interruption of the communication of well afoot or the first and/or second visible light communication equipment of learning.
In order to be the second visible light communication devices allocation visible ray transceiver again, the method for the embodiment of the present application also comprises:
S290. determine the position of described at least one the second visible light communication equipment.
In the method for the embodiment of the present application, described position can be the definite geographical location information of the second visible light communication equipment, also can be the relative position relation information of the second visible light communication equipment and forwarding unit, this relative position relation can be according to the location positioning of the second visible light communication equipment, and the accurate location of the second visible light communication equipment can send in the lump in sending the response of described connection request, or after the second visible light communication equipment is moved, informs the final controlling element of the method for the embodiment of the present application.In the possible implementation of fixing at a kind of the second visible light communication device location, forwarding unit this locality stores corresponding positional information, just can be from the local initial position of determining the second visible light communication equipment of forwarding unit according to the identification information of the second visible light communication equipment.
According to a position constantly on the second visible light communication equipment, the second visible light communication equipment, be described the second visible light communication devices allocation visible ray transceiver again with the corresponding variation of visible ray transceiver relative position and the visual field of the visible ray transceiver of forwarding unit.Because described variation may can't cause the second visible light communication equipment to leave the visual field of the visible ray transceiver of distributing to it, therefore, the possibility of result of redistributing was identical with the allocation result at upper a moment.
With reference to Fig. 4 (a) and Fig. 4 (b), further illustrate the process of redistributing.Scene as shown in Fig. 4 (a), the first visible light communication equipment 41 is realized the visible light communication under non-line-of-sight transmission condition by forwarding unit 40 and the second visible light communication equipment 42.It is the visible ray transceiver of 30 ° that forwarding unit 40 has four visuals field, makes forwarding unit 40 have the coverage of 120 °.Initial communication connects while setting up, the first visible ray transceiver 401 of forwarding unit 40 is distributed to the first visible light communication equipment 41, the three visible ray transceivers 403 and distribute to the second visible light communication equipment 42, the second and the 4th visible ray transceiver 402,404 can not work, thus energy efficient.In communication process, there is the rotation of counterclockwise 40 ° in forwarding unit 40, makes the first visible light communication equipment 41 leave the visual field of the first visible ray transceiver 401, and the second visible light communication equipment 42 also leaves the visual field of the 3rd visible ray transceiver 403.According to the visual field of each visible ray transceiver, 40 ° of rotations that forwarding unit 40 is counterclockwise will make the first visible light communication equipment 41 fall into the visual field of the second visible ray transceiver 402, the second visible light communication equipment 42 falls into the visual field of the 4th visible ray transceiver 404, and then as shown in Fig. 4 (b), again the second visible ray transceiver 402 of forwarding unit 40 is distributed to the first visible light communication equipment 41, the 4th visible ray transceiver 404 is distributed to the second visible light communication equipment 42, the first and the 3rd visible ray transceiver 401,403 quits work.
To sum up, the method of the embodiment of the present application can be adjusted the visible ray transceiver that forwarding unit is distributed to visible light communication equipment dynamically according to the communication conditions of the visible light communication under non-line-of-sight transmission condition, can guarantee visible light communication under non-line-of-sight transmission condition continue carry out, make full use of simultaneously and save system resource.
It will be appreciated by those skilled in the art that, in the said method of the application's embodiment, the sequence number size of each step does not also mean that the priority of execution sequence, the execution sequence of each step should be definite with its function and internal logic, and should not form any restriction to the implementation process of the application's embodiment.
In addition, the embodiment of the present application also provides a kind of computer-readable medium, is included in the computer-readable instruction that carries out following operation while being performed: carry out the operation of each step of the method in above-mentioned Fig. 2 illustrated embodiment.
The embodiment of the present application also provides a kind of visible light communication device of carrying out above-mentioned visible light communication method, and this device can be the device that is independent of forwarding unit, also can belong to forwarding unit, and maybe this device itself is forwarding unit.When this device itself is forwarding unit, except each part that is about to below describe, this device also comprises other necessary component of visible light communication equipment.In addition,, according to the needs of the above-mentioned different executive roles of this device, except each part described below, described device also comprises can be realized and the communication module of installing outside arbitrary equipment and communicating by letter as required.As shown in Figure 5, the visible light communication device 500 of the embodiment of the present application comprises:
Search module 520, for receive the Forward-reques from least one the first visible light communication equipment in response to forwarding unit, search at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment.
In the device of the embodiment of the present application, the first visible light communication equipment cannot set up maybe cannot continue and the second visible light communication equipment between visible light communication time, also under non-line-of-sight transmission condition, can send Forward-reques, Forward-reques is for making suitable forwarding unit can serve as the role of relaying between the first visible light communication equipment and the second visible light communication equipment, and the first visible light communication equipment of forwarding is issued the light signal of the second visible light communication equipment.Described Forward-reques can send for the form by broadcast, to find possible forwarding unit in the visible ray transceiver visual field of the first visible light communication equipment.Described Forward-reques can be also that the mode by multicast or clean culture directionally sends to known possible forwarding unit.Search module 520 while receiving described Forward-reques or afterwards, according to described Forward-reques, search the second corresponding visible light communication equipment.
Distribution module 540, be used in response to find at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment in the coverage of described forwarding unit, according to the visual field of each visible ray transceiver of described forwarding unit, be the first visible light communication equipment described in each and the second visible light communication devices allocation visible ray transceiver separately described in each.
In the device of the embodiment of the present application, the first visible light communication equipment that sends Forward-reques in the coverage of forwarding unit if do not find is wanted the second visible light communication equipment of communication, and described forwarding unit can not be as the relaying of the two subsequent communications; The the first visible light communication equipment that sends Forward-reques in the coverage of described forwarding unit if can find is wanted the second visible light communication equipment of communication, judges that described forwarding unit can be as the forwarding unit of the relaying of the two subsequent communications.Subsequently, distribution module 540 is according to the relative position relation between described the first visible light communication equipment and the second visible light communication equipment and described forwarding unit, or rather, which according to described the first visible light communication equipment and the second visible light communication equipment, lay respectively in the visual field as visible ray transceiver of the forwarding unit of relaying, for described the first visible light communication equipment and the second visible light communication devices allocation visible ray transceiver separately, what distribute to described the first visible light communication equipment and the second visible light communication equipment can be same visible ray transceiver, also can be different visible ray transceivers.
To sum up, the device of the embodiment of the present application by using comprise at least two visible ray transceivers forwarding unit as the relaying between the visible light communication equipment under non-line-of-sight transmission condition, and for communicating pair distributes visible ray transceiver separately, can realize the visible light communication under the non-line-of-sight transmission condition in maximum area coverage.
In a kind of possible implementation, described Forward-reques can be the request message of the identification information that only comprises the second visible light communication equipment, the data message that the object sending after request forwarding unit can forward is the second visible light communication equipment corresponding to this identification information.In another possible implementation, for example, in the scene of the known forwarding unit that can be used as relaying, described Forward-reques can be the data message of the identification information that destination address comprises the second visible light communication equipment.No matter, in which kind of implementation, can search the second corresponding visible light communication equipment according to described identification information.It should be noted that, forwarding unit this locality can store the relevant information of the visible light communication equipment in its coverage, therefore, can in the local canned data of forwarding unit, search described identification information, and also as shown in Figure 6, searching module 520 can comprise:
Search unit 522, for searching described identification information in described forwarding unit this locality, if find described identification information, show to exist corresponding the second visible light communication equipment in the coverage of forwarding unit.
As shown in Figure 7, in the possible implementation of another kind, search module 520 and also can comprise:
Connection request unit 524, for search unit 522 cannot be when described forwarding unit this locality finds corresponding identification information, the described at least one second visible light communication equipment corresponding to described identification information sends the light signal that comprise connection request.
Because forwarding unit comprises at least two visible ray transceivers, in order to search whole coverages of forwarding unit, all visible ray transceivers that connection request unit 524 can be by forwarding unit are respectively to the light signal that comprises connection request described in its sending within sweep of the eye separately.
And the device 500 of the embodiment of the present application also comprises:
Acquisition module 560, while there is the second visible light communication equipment corresponding with described identification information in the coverage of forwarding unit, this acquisition module 560 can get the response to described connection request that described at least one the second visible light communication equipment sends.
If acquisition module 560 gets the response to described connection request that the second visible light communication equipment corresponding to described identification information that forwarding unit receives sends, distribution module 540 can determine that described forwarding unit can be as the forwarding unit of relaying, and is each visible light communication devices allocation visible ray transceiver.
As shown in Figure 8, in a kind of possible implementation, distribution module 540 can comprise: the first allocation units 542, and at least one visible ray transceiver that receives Forward-reques is distributed to the first visible light communication equipment that described Forward-reques is corresponding.
The second allocation units 544, for distributing to the second visible light communication equipment corresponding to described response by receiving described at least one visible ray transceiver to the response of described connection request.
For described forwarding unit, its visible ray transceiver that can receive described Forward-reques may more than one, but the not all visible ray transceiver that can receive Forward-reques is all suitable as the signal that relaying sends the first visible light communication equipment, is transmitted to the second visible light communication equipment.For example, in scene as shown in Figure 3, forwarding unit 30 is comprised of four visible ray transceivers, and the Forward-reques that the first visible light communication equipment 31 sends is by all four the visible ray transceivers 301,302 by its coverage, and 303,304 receive.But the restriction due to transmission conditions or hardware condition, the visible ray transceiver 301 that the second visible light communication equipment 32 can receive, 302, 303, the intensity of 304 light signals that send is different, even may all light signal can be sent to the second visible light communication equipment 32 by not all visible ray transceiver, as shown in Figure 3, the second visible light communication equipment 32 is not at visible ray transceiver 301, in 302 the visual field, so visible ray transceiver 301, 302 can not send to light signal the second visible light communication equipment 32, therefore, in order better to utilize system resource and to improve as far as possible communication quality, the higher corresponding visible ray transceiver of light signal of intensity that the second visible light communication equipment can be received is distributed to the second visible light communication equipment.Correspondingly, as shown in Figure 9, the second allocation units 544 can further comprise:
Second determines subelement 5442, for comprising the intensity of the light signal of connection request described in determining that described at least one the second visible light communication equipment receives that described forwarding unit sends.In a kind of possible implementation, this strength information can be included in that the second visible light communication equipment returns in the response of connection request.
Second distributes subelement 5444, for according to the intensity that comprises the light signal of connection request described in receiving being at least one visible ray transceiver described in described at least one the second visible light communication devices allocation.
Preferably, the second distribution subelement 5444 is the corresponding visible ray transceiver of light signal that the second visible light communication devices allocation signal strength signal intensity is the strongest.
Similarly, for described forwarding unit, the visible ray transceiver to the response of described connection request that can receive the second visible light communication equipment may more than one, but not all visible ray transceiver is all suitable as the signal that relaying sends the second visible light communication equipment, is transmitted to the first visible light communication equipment.Still as shown in Figure 3, the response that the second visible light communication equipment 32 returns will be forwarded four visible ray transceivers 301,302 of equipment 30 to example, and 303,304 receive.But the restriction due to transmission conditions or hardware condition, the visible ray transceiver 301 that the first visible light communication equipment receives, 302, 303, the intensity of 304 light signals that send may be different, even may all light signal can be sent to the first visible light communication equipment 31 by not all visible ray transceiver, as shown in Figure 3, the first visible light communication equipment 31 is not at visible ray transceiver 303, in 304 the visual field, so visible ray transceiver 303, 304 can not send to light signal the first visible light communication equipment 31, therefore, in order better to utilize system resource and to improve as far as possible communication quality, the method of the embodiment of the present application is also the best visible ray transceivers of the first visible light communication devices allocation transmission conditions.Correspondingly, as shown in figure 10, the first allocation units 542 can comprise:
First sends subelement 5422, for sending test light signal by the described at least one visible ray transceiver that receives Forward-reques to described at least one the first visible light communication equipment.This test light signal is for determining that the first visible light communication equipment receives the intensity of this light signal and sends.
First determines subelement 5424, for determining the intensity of the described test light signal that described at least one the first visible light communication equipment receives.In a kind of possible implementation, the first visible light communication equipment receives feedback light strength information after the light signal that the first transmission subelement 5422 sends.
First distributes subelement 5426, for according to the intensity of described light signal being at least one visible ray transceiver described in described at least one the first visible light communication devices allocation.
Preferably, the first distribution subelement 5426 is the corresponding visible ray transceiver of light signal that the first visible light communication devices allocation signal strength signal intensity is the strongest.
It should be noted that, except being the first visible light communication equipment and the second visible light communication devices allocation visible ray transceiver by process recited above, forwarding unit this locality also can store the first visible light communication equipment, the second visible light communication equipment of specific relative position and can be the corresponding relation record of the visible ray transceiver of its distribution.In another possible implementation, the first allocation units 542 and the second allocation units 544 can not have above-mentioned subelement, directly can carry out above-mentioned distribution with reference to this record of the local storage of described forwarding unit.
In addition,, in visible light communication process, position and/or the attitude of the first visible light communication equipment, the second visible light communication equipment and described forwarding unit all have the possibility changing.For example, three, appoint under one or more scene being moved, three's relative position relation changes, and script line-of-sight transmission condition between any two may change under non-line-of-sight transmission condition, thereby causes communication disruption.Again for example, if changing, forwarding unit attitude (rotates, etc.), the visual field of originally distributing to the visible ray transceiver of the first visible light communication equipment and/or the second visible light communication equipment may no longer can cover the first visible light communication equipment and/or the second visible light communication equipment, thereby causes communication disruption.Therefore, as shown in figure 11, in a kind of possible implementation, the device 500 of the embodiment of the present application also can comprise:
Reallocation module 530, for changing with the relative position of corresponding visible ray transceiver in response to described at least one the first visible light communication equipment, for described at least one the first visible light communication equipment is redistributed visible ray transceiver.Tool is sayed it, and described variation may make the first visible light communication equipment leave the visual field of the visible ray transceiver of distributing to it.The reason that causes this situation may be that the first visible light communication equipment is moved, or forwarding unit is moved and/or rotates.In this case, reallocation module 530 will be described the first visible light communication devices allocation visible ray transceiver again.And reallocation module 530 can be moved and make the judgement that described relative position changes according to the accidental interruption of the communication of well afoot or the first and/or second visible light communication equipment of learning.
Reallocation module 530 is also for changing with the relative position of corresponding visible ray transceiver in response to described at least one the second visible light communication equipment, for described at least one the second visible light communication equipment is redistributed visible ray transceiver.Tool is sayed it, and described variation may make the second visible light communication equipment leave the visible ray transceiver of the forwarding unit of distributing to it.The reason that causes this situation may be that the second visible light communication equipment is moved, or forwarding unit is moved and/or rotates.In this case, reallocation module 530 will be described the second visible light communication devices allocation visible ray transceiver again.And reallocation module 530 can be moved and make the judgement that described relative position changes according to the accidental interruption of the communication of well afoot or the first and/or second visible light communication equipment of learning.
In order to be the first or second visible light communication devices allocation visible ray transceiver again, as shown in figure 12, the device 500 of the embodiment of the present application also comprises:
The first determination module 550, for determining the position of described at least one the first visible light communication equipment.Described position can be the definite geographical location information of the first visible light communication equipment, also can be the relative position relation information of the first visible light communication equipment and forwarding unit, this relative position relation can be according to the location positioning of the first visible light communication equipment, and the accurate location of the first visible light communication equipment can be and sends in the lump in sending described Forward-reques, or after the first visible light communication equipment is moved, informs the first determination module 550.In the possible implementation of fixing at a kind of the first visible light communication device location, in Forward-reques, also comprise the identification information of the first visible light communication equipment, forwarding unit this locality stores corresponding positional information, and the first determination module 550 just can be from the local initial position of determining the first visible light communication equipment of forwarding unit according to this identification information.
Reallocation module 530 can be described the first visible light communication devices allocation visible ray transceiver with the corresponding variation of visible ray transceiver relative position and the visual field of the visible ray transceiver of forwarding unit according to a position constantly on the first visible light communication equipment, the first visible light communication equipment again.Due to the described visual field that may can't cause the second visible light communication equipment to leave the visible ray transceiver of distributing to it that changes, therefore, the possibility of result of redistributing was identical with the allocation result in a upper moment.
The second determination module 570, for determining the position of described at least one the second visible light communication equipment.Described position can be the definite geographical location information of the second visible light communication equipment, also can be the relative position relation information of the second visible light communication equipment and forwarding unit, this relative position relation can be according to the location positioning of the second visible light communication equipment, and the accurate location of the second visible light communication equipment can be and sends in the lump, or after being moved, the second visible light communication equipment informs the second determination module 570 in sending the response of described connection request.In the possible implementation of fixing at a kind of the second visible light communication device location, forwarding unit this locality stores corresponding positional information, and the second determination module 570 just can be from the local initial position of determining the second visible light communication equipment of forwarding unit according to the identification information of the second visible light communication equipment.
Reallocation module 530 is described the second visible light communication devices allocation visible ray transceiver according to a position constantly on the second visible light communication equipment, the second visible light communication equipment with the corresponding variation of visible ray transceiver relative position and the visual field of the visible ray transceiver of forwarding unit again.Due to the described visual field that may can't cause the second visible light communication equipment to leave the visible ray transceiver of distributing to it that changes, therefore, the possibility of result of redistributing was identical with the allocation result in a upper moment.
To sum up, the device of the embodiment of the present application can be adjusted the visible ray transceiver that forwarding unit is distributed to visible light communication equipment dynamically according to the communication conditions of the visible light communication under non-line-of-sight transmission condition, can guarantee visible light communication under non-line-of-sight transmission condition continue carry out, make full use of simultaneously and save system resource.
The structural representation of a kind of visible light communication device 1300 that Figure 13 provides for the embodiment of the present application, the application's specific embodiment does not limit the specific implementation of visible light communication device 1300.As shown in figure 13, this visible light communication device 1300 can comprise:
Processor (processor) 1310, communication interface (Communications Interface) 1320, memory (memory) 1330 and communication bus 1340.Wherein:
Processor 1310, communication interface 1320 and memory 1330 complete mutual communication by communication bus 1340.
Communication interface 1320, for the net element communication with such as client etc.
Processor 1310, for executive program 1332, specifically can realize the correlation function of visible light communication device in the device embodiment of above-mentioned Fig. 5.
Particularly, program 1332 can comprise program code, and described program code comprises computer-managed instruction.
Processor 1310 may be a central processor CPU, or specific integrated circuit ASIC (Application Specific Integrated Circuit), or is configured to implement one or more integrated circuits of the embodiment of the present application.Program 1332 specifically can be for making described visible light communication device 1300 carry out following steps:
In response to forwarding unit, receive the Forward-reques from least one the first visible light communication equipment, search at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment;
In response to find at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment in the coverage of described forwarding unit, according to the visual field of each visible ray transceiver of described forwarding unit, be the first visible light communication equipment described in each and the second visible light communication devices allocation visible ray transceiver separately described in each.
In program 1332, the specific implementation of each step can, referring to description corresponding in the corresponding steps in above-described embodiment and unit, be not repeated herein.Those skilled in the art can be well understood to, and for convenience and simplicity of description, the specific works process of the equipment of foregoing description and module, can describe with reference to the corresponding process in preceding method embodiment, does not repeat them here.
Those skilled in the art can be well understood to, and for convenience and simplicity of description, the specific works process of the equipment of foregoing description and module, can describe with reference to the correspondence in aforementioned means embodiment, does not repeat them here.
Although theme described herein is the execution in computer system and providing in the general context carried out in binding operation system and application program, but also one skilled in the art will recognize that and can carry out other realizations in conjunction with the program module of other types.Generally speaking, program module comprises the structure of carrying out particular task or realizing routine, program, assembly, data structure and the other types of particular abstract data type.It will be appreciated by those skilled in the art that, this theme described herein can be put into practice by other computer system configurations, comprise portable equipment, multicomputer system, based on microprocessor or programmable consumer electronics, minicom, mainframe computer etc., also can use in the distributed computing environment (DCE) that task is carried out by the teleprocessing equipment connecting by communication network therein.In distributed computing environment (DCE), program module can be arranged in both of local and remote memory storage device.
Those of ordinary skills can recognize, unit and the method step of each example of describing in conjunction with embodiment disclosed herein, can realize with the combination of electronic hardware or computer software and electronic hardware.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds the application's scope.
If described function usings that the form of SFU software functional unit realizes and during as production marketing independently or use, can be stored in a computer read/write memory medium.Understanding based on such, the part that the application's technical scheme contributes to original technology in essence in other words or the part of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions are with so that a computer equipment (can be personal computer, server, or the network equipment etc.) carry out all or part of step of method described in each embodiment of the application.And aforesaid computer read/write memory medium comprises storing as any mode of the information such as computer-readable instruction, data structure, program module or other data or physics volatibility that technology realizes and non-volatile, removable and can not be because of eastern medium.Computer read/write memory medium specifically comprises, but be not limited to, USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), Erasable Programmable Read Only Memory EPROM (EPROM), EEPROM (Electrically Erasable Programmable Read Only Memo) (EEPROM), flash memory or other solid-state memory technology, CD-ROM, digital versatile disc (DVD), HD-DVD, blue light (Blue-Ray) or other light storage devices, tape, disk storage or other magnetic storage apparatus, maybe can be for storing information needed and can be by any other medium of computer access.
Above execution mode is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (28)
1. a visible light communication method, is characterized in that, described method comprises:
In response to forwarding unit, receive the Forward-reques from least one the first visible light communication equipment, search at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment;
In response to find at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment in the coverage of described forwarding unit, according to the visual field of each visible ray transceiver of described forwarding unit, be the first visible light communication equipment described in each and the second visible light communication devices allocation visible ray transceiver separately described in each.
2. method according to claim 1, is characterized in that, described Forward-reques comprises the identification information of the second visible light communication equipment;
Described searching at least one the second visible light communication equipment corresponding with described at least one the first visible light communication equipment:
According to described identification information, search described at least one the second visible light communication equipment.
3. method according to claim 2, is characterized in that, describedly according to described identification information, searches described at least one the second visible light communication equipment and comprises:
In described forwarding unit this locality, search described identification information.
4. method according to claim 2, is characterized in that, describedly according to described identification information, searches described at least one the second visible light communication equipment and comprises:
The described at least one second visible light communication equipment corresponding to described identification information sends the light signal that comprises connection request.
5. method according to claim 4, is characterized in that, described method also comprises:
Obtain the response to described connection request that described at least one the second visible light communication equipment sends.
6. according to the method described in any one in claim 1 to 5, it is characterized in that, described according to the visual field of each visible ray transceiver of described forwarding unit, for the first visible light communication equipment described in each and the second visible light communication equipment described in each, determine visible ray transceiver separately and comprise:
At least one visible ray transceiver that receives Forward-reques is distributed to the first visible light communication equipment that described Forward-reques is corresponding.
7. method according to claim 6, is characterized in that, describedly at least one visible ray transceiver that receives Forward-reques is distributed to the first visible light communication equipment that described Forward-reques is corresponding comprises:
By described at least one visible ray transceiver, to described at least one the first visible light communication equipment, send test light signal;
Determine the intensity of the described test light signal that described at least one the first visible light communication equipment receives;
According to the intensity of described test light signal, it is at least one visible ray transceiver described in described at least one the first visible light communication devices allocation.
8. method according to claim 7, it is characterized in that, described according to the visual field of each visible ray transceiver of described forwarding unit, for the first visible light communication equipment described in each and the second visible light communication equipment described in each, determine visible ray transceiver separately and comprise:
At least one visible ray transceiver that receives described response is distributed to the second visible light communication equipment corresponding to described response.
9. method according to claim 8, is characterized in that, describedly at least one visible ray transceiver that receives described response is distributed to the second visible light communication equipment corresponding to described response comprises:
Determine that described at least one the second visible light communication equipment comprises the intensity of the light signal of connection request described in receiving;
According to the intensity that comprises the light signal of connection request described in receiving, it is at least one visible ray transceiver described in described at least one the second visible light communication devices allocation.
10. according to the method described in claim 1 to 9 any one, it is characterized in that, described method also comprises:
In response to described at least one the first visible light communication equipment, change with the relative position of corresponding visible ray transceiver, for described at least one the first visible light communication equipment is redistributed visible ray transceiver.
11. methods according to claim 10, is characterized in that, described method also comprises:
Determine the position of described at least one the first visible light communication equipment.
12. methods according to claim 11, is characterized in that, described Forward-reques comprises the positional information of described at least one the first visible light communication equipment.
13. methods according to claim 8 or claim 9, is characterized in that, described method also comprises:
In response to described at least one the second visible light communication equipment, change with the relative position of corresponding visible ray transceiver, for described at least one the second visible light communication equipment is redistributed visible ray transceiver.
14. methods according to claim 13, is characterized in that, described method also comprises:
Determine the position of described at least one the second visible light communication equipment.
15. methods according to claim 14, is characterized in that, described response comprises the positional information of described at least one the second visible light communication equipment.
16. 1 kinds of visible light communication devices, is characterized in that, described device comprises:
One searches module, for receive the Forward-reques from least one the first visible light communication equipment in response to forwarding unit, searches at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment;
One distribution module, for finding at least one second visible light communication equipment corresponding with described at least one the first visible light communication equipment in response to the described module of searching in the coverage of described forwarding unit, according to the visual field of each visible ray transceiver of described forwarding unit, be the first visible light communication equipment described in each and the second visible light communication devices allocation visible ray transceiver separately described in each.
17. devices according to claim 16, is characterized in that, described in search the second visible light communication equipment that module comprises according to described Forward-reques identification information search described at least one the second visible light communication equipment.
18. devices according to claim 17, is characterized in that, described in search module and comprise:
One searches unit, for searching described identification information in described forwarding unit this locality.
19. devices according to claim 18, is characterized in that, described in search module and also comprise:
One connection request unit, for sending to described at least one the second visible light communication equipment corresponding to described identification information the light signal that comprises connection request.
20. devices according to claim 19, is characterized in that, described device also comprises:
One acquisition module, the response to described connection request sending for obtaining described at least one the second visible light communication equipment.
21. according to claim 16 to the device described in any one in 20, it is characterized in that, described distribution module comprises:
The first allocation units, for distributing to by least one visible ray transceiver that receives Forward-reques the first visible light communication equipment that described Forward-reques is corresponding.
22. devices according to claim 21, is characterized in that, described the first allocation units comprise:
One first sends subelement, for sending test light signal by described at least one visible ray transceiver to described at least one the first visible light communication equipment;
One first determines the intensity of examination light signal;
One first distributes subelement, for according to the intensity of described test light signal being at least one visible ray transceiver described in described at least one the first visible light communication devices allocation.
23. devices according to claim 22, is characterized in that, described distribution module also comprises:
One second allocation units, for distributing at least one visible ray transceiver that receives described response the second visible light communication equipment corresponding to described response.
24. devices according to claim 23, is characterized in that, described the second allocation units comprise:
One second determines subelement, comprises the intensity of the light signal of connection request for definite described at least one the second visible light communication equipment described in receiving;
One second distributes subelement, for according to the intensity that comprises the light signal of connection request described in receiving being at least one visible ray transceiver described in described at least one the second visible light communication devices allocation.
25. according to claim 16 to the device described in 24 any one, it is characterized in that, described device also comprises:
Reallocation module, for changing with the relative position of corresponding visible ray transceiver in response to described at least one the first visible light communication equipment, for described at least one the first visible light communication equipment is redistributed visible ray transceiver.
26. devices according to claim 25, is characterized in that, described device also comprises:
One first determination module, for determining the position of described at least one the first visible light communication equipment.
27. according to the device described in claim 23 or 24, it is characterized in that, described device also comprises:
Reallocation module, for changing with the relative position of corresponding visible ray transceiver in response to described at least one the second visible light communication equipment, for described at least one the second visible light communication equipment is redistributed visible ray transceiver.
28. devices according to claim 27, is characterized in that, described device also comprises:
One second determination module, for determining the position of described at least one the second visible light communication equipment.
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| CN201410478111.3A CN104202088B (en) | 2014-09-18 | 2014-09-18 | Visible light communication method and visible light communication device |
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| CN201410478111.3A CN104202088B (en) | 2014-09-18 | 2014-09-18 | Visible light communication method and visible light communication device |
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| CN105812057A (en) * | 2016-04-29 | 2016-07-27 | 东北电力大学 | Indoor visible light communication relay forwarding device |
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| US11929780B2 (en) | 2019-06-24 | 2024-03-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods, apparatus and machine-readable mediums related to wireless communication in communication networks |
| CN112769485A (en) * | 2020-12-21 | 2021-05-07 | 北京科技大学 | Visible light relay system suitable for environment under mine |
| CN112769485B (en) * | 2020-12-21 | 2022-04-12 | 北京科技大学 | Visible light relay system suitable for environment under mine |
| CN113507321A (en) * | 2021-07-08 | 2021-10-15 | 宁夏荣光电节能科技实业有限公司 | Office lighting system based on visible light communication |
| CN113507322A (en) * | 2021-07-08 | 2021-10-15 | 宁夏荣光电节能科技实业有限公司 | Wisdom lighting system of family based on visible light communication |
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