CN106330309A - VLC-WiFi hybrid network user link access and switching method - Google Patents
VLC-WiFi hybrid network user link access and switching method Download PDFInfo
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- CN106330309A CN106330309A CN201610700689.8A CN201610700689A CN106330309A CN 106330309 A CN106330309 A CN 106330309A CN 201610700689 A CN201610700689 A CN 201610700689A CN 106330309 A CN106330309 A CN 106330309A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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Abstract
The invention discloses a VLC-WiFi hybrid network user link access and switching method. The method comprises the steps that during an initial stage, a user terminal applies a WiFi access uplink for a server; then, the user terminal applies a WiFi access downlink or a VLC downlink for the server according to a region in which the user terminal is located; and, the user terminal judges whether downlink switching is carried out or not according to whether a user terminal carrier can receive VLC data or not when moving among different regions, and/or the accuracy of receiving the VLC data. According to the method, the access of a user in a VLC-WiFi hybrid network is realized and the mobility of the user can be supported, so that the moving user also can obtain a relatively good communication link, the network capacity and speed are expanded and increased, and the service quality of the VLC-WiFi hybrid network is ensured.
Description
Technical field
The present invention relates to technical field of visible light communication, particularly relate to a kind of VLC-WiFi hybrid network user link and access
Method with switching.
Background technology
VLC (Visible Light Communicaiton, it is seen that optic communication) technology refers to utilize the light of visible light wave range
As information carrier, it is not necessary to the transmission medium of the wire message way such as optical fiber, the most directly transmit the communication mode of optical signal.With
People constantly to increase the demand of data, services, wireless network promotes available capacity and spectrum efficiency constantly.So
And, owing to frequency spectrum resource is limited, and most frequency spectrum has been authorized to take, and radio band becomes more and more crowded.VLC makees
For emerging wireless communication technology, it is sent to great expectations.VLC uses extremely abundant undelegated frequency spectrum resource, can provide
While normal illumination, it is provided that communication link very at a high speed, have and carry roomy, green low-carbon, safety height and low cost etc.
Advantage.
WiFi (Wireless Fidelity, Wireless Fidelity) is that a kind of permission electronic equipment is connected to a wireless local
The technology of net, is usually used in the places such as family, restaurant, office, has the advantages such as speed is high, construction cost is low.
In future, the demand bigger along with the demand data amount such as Internet of Things, smart city advances, and VLC can enter with WiFi
Row merges, and forms a hybrid network.In hybrid network, VLC and WiFi complements one another, and network can make full use of both
Advantage reaches higher capacity and speed, thus provides more preferable data, services.
In view of the locality of VLC overlay area in VLC-WiFi network and the mobility of user, need a kind of scheme
Control the access of user, and realize user's link switching when mobile, thus ensure the access of user and stablizing of link
Property；But, there is presently no the most perfect scheme.
Summary of the invention
It is an object of the invention to provide a kind of VLC-WiFi hybrid network user link to access and the method for switching, to ensure
The service quality of VLC-WiFi hybrid network.
It is an object of the invention to be achieved through the following technical solutions:
A kind of VLC-WiFi hybrid network user link accesses and the method for switching, including:
In the starting stage, user terminal accesses WiFi up-link to server application；
Afterwards, the region that user terminal is currently located according to it, access WiFi downlink or VLC to server application
Downlink；Further, when user terminal is always according to mobile between zones of different of user terminal carrier, if be able to receive that
To VLC data and/or the accuracy that receives VLC data, judge whether to the switching of downlink；
Wherein, the region that user terminal is currently located includes: VLC overlay area, the overlapping region of VLC overlay area or
Non-VLC overlay area；The movement between zones of different of the user terminal carrier includes: cover with non-VLC in VLC overlay area
Move between region, moved to another VLC overlay area through the overlapping region of VLC overlay area by current VLC overlay area, or
Person moves between non-VLC overlay area and the overlapping region of VLC overlay area.
If user terminal is currently at VLC overlay area, then after user terminal receives the VLC frame that VLC focus sends, logical
Cross WiFi up-link and send VLC downlink access request to server；Described VLC downlink access request contains
The channel quality of ID, VLC focus of the VLC focus that user terminal obtains from VLC frame and whether there is remaining time slots situation；
Described server positions VLC focus according to the ID of VLC focus described in VLC downlink access request, and judges
Whether the channel quality of described VLC focus reaches target；If so, and there is remaining time slots, then link is accessed by server
The gap information of request success message and distribution controls channel by WiFi and sends to user terminal, and afterwards, user terminal uses
Described VLC focus receives downlink data, thus accesses VLC downlink.
If user terminal is currently at non-VLC overlay area, then cannot receive VLC signal, in the nothing that waits for a period of time
After method receives the VLC frame that VLC focus sends, sending the access of WiFi downlink by WiFi up-link to server please
Ask；After receiving the confirmation message that server returns, described user terminal accesses WiFi downlink.
If user terminal is currently at the overlapping region of VLC overlay area, then user terminal receives two VLC focuses and sends out
After the VLC frame sent, send VLC downlink access request by WiFi up-link to server；Described VLC downlink connects
Enter the channel quality of ID, VLC focus containing the VLC focus that user terminal obtains from two VLC frames in request and be
No there is remaining time slots situation；
After described server receives VLC downlink access request, it is determined that user terminal is currently at VLC overlay area
Overlapping region, then control channel by WiFi and send application failed message to user terminal；
After described user terminal receives application failed message, send the descending chain of WiFi by WiFi up-link to server
Road access request, and after receiving the confirmation message that server returns, access WiFi downlink.
When user terminal carrier moves between VLC overlay area and non-VLC overlay area, user terminal is at WiFi
Downlink includes with VLC downlink handover process:
When user terminal carrier moves to non-VLC overlay area from VLC overlay area, VLC signal gradually weakens, and uses
Family terminal can receive wrong data, and the most described user terminal is sent by the descending chain of VLC to server by WiFi up-link
The handover request of road direction WiFi downlink, and after receiving the confirmation message that server returns, discharge the time slot of oneself, by
VLC downlink handover is to WiFi downlink；
When user terminal carrier moves to VLC overlay area from non-VLC overlay area, user terminal will receive
The VLC frame that VLC focus sends, then user terminal is sent by WiFi downlink to VLC to server by WiFi up-link
The handover request of downlink；Handover request contains ID, VLC focus of the VLC focus that user terminal obtains from VLC frame
Channel quality and whether there is remaining time slots situation；Described server is fixed according to the ID of VLC focus described in handover request
Position VLC focus, and judge whether the channel quality of described VLC focus reaches target；And there is remaining time slots, then if so,
The gap information of handover request success message and distribution is controlled channel by WiFi and sends to user terminal by server, afterwards,
User terminal by WiFi downlink handover to VLC downlink.
When user terminal carrier is covered to another VLC through the overlapping region of VLC overlay area by current VLC overlay area
When region is moved, user terminal includes with VLC downlink handover process at WiFi downlink:
When user terminal carrier is moved the overlapping region to VLC overlay area by current VLC overlay area, described
There is area interference in the overlapping region of VLC overlay area, described user terminal can receive wrong data；Then user terminal passes through
WiFi up-link sends by VLC downlink to the handover request of WiFi downlink to server, and is receiving server
After the confirmation message returned, discharge the time slot of oneself, by VLC downlink handover to WiFi downlink；
When user terminal carrier is moved to another VLC overlay area by the overlapping region of VLC overlay area, described use
Family terminal receives the VLC frame that VLC focus sends, then user terminal is sent by under WiFi to server by WiFi up-link
Line link is to the handover request of VLC downlink；Handover request contains the VLC focus that user terminal obtains from VLC frame
The channel quality of ID, VLC focus and whether there is remaining time slots situation；Described server is according to described in handover request
The ID of VLC focus positions VLC focus, and judges whether the channel quality of described VLC focus reaches target；And deposit if so,
In remaining time slots, then the gap information of handover request success message and distribution is controlled channel transmission to using by WiFi by server
Family terminal, afterwards, user terminal by WiFi downlink handover to VLC downlink.
When user terminal carrier moves between non-VLC overlay area and the overlapping region of VLC overlay area, user
Terminal cannot receive the VLC frame of VLC focus transmission or can receive wrong data；Described user terminal keeps accessing WiFi
Downlink.
Described VLC frame includes: the time slot of each user terminal under frame head and a VLC focus；Wherein:
Multiple user terminals under one VLC focus use time division multiple access way distribution time slot；
Frame head comprises synchronizing sequence, training sequence and the ID of VLC focus；Described synchronizing sequence is used for VLC focus and use
Family receiving terminal synchronizes, and training sequence is for estimating the channel quality of VLC focus, and ID is for unique mark VLC focus.
As seen from the above technical solution provided by the invention, it is achieved that user's connecing in VLC-WiFi hybrid network
Enter, and the mobility of user can be supported so that the user in Yi Dong also is able to obtain preferable communication link, also promote simultaneously
The capacity of network and speed, thus ensured the service quality of VLC-WiFi hybrid network.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, required use in embodiment being described below
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for this
From the point of view of the those of ordinary skill in field, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
The VLC-WiFi hybrid network system illustraton of model that Fig. 1 provides for the embodiment of the present invention；
Fig. 2 accesses and the method switched for a kind of VLC-WiFi hybrid network user link that the embodiment of the present invention provides
Flow chart；
Fig. 3 accesses/switches to WiFi downlink and VLC downlink for the user terminal that the embodiment of the present invention provides
Flow chart；
The server that Fig. 4 provides for the embodiment of the present invention accesses according to the information processing user terminal received/switches to
WiFi downlink and the flow chart of VLC downlink；
The workflow diagram of the WiFi access point that Fig. 5 provides for the embodiment of the present invention；
The structural representation of the VLC frame that Fig. 6 provides for the embodiment of the present invention；
The Simulation results schematic diagram that Fig. 7 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Inventive embodiment, the every other enforcement that those of ordinary skill in the art are obtained under not making creative work premise
Example, broadly falls into protection scope of the present invention.
The embodiment of the present invention provides a kind of VLC-WiFi hybrid network user link to access and the method for switching；VLC-WiFi
Hybrid network system model is as it is shown in figure 1, mainly include three kinds of region: 1-non-VLC overlay areas, 2-VLC under this system model
Cell coverage area and 3-VLC community overlapping region.
It is an object of the invention to guarantee that user terminal, when corresponding region, can access corresponding network accurately, with
Time, it is also to be ensured that user terminal carrier, when these regions are moved, can keep mobile terminal to carry out network switching accurately,
Avoid the situation that user terminal goes offline.
A kind of VLC-WiFi hybrid network user link that the embodiment of the present invention provides accesses the flow process of the method with switching
As in figure 2 it is shown, it specifically includes that
Step 11, in the starting stage, user terminal to server application access WiFi up-link；
The region that step 12, user terminal are currently located according to it, to server application access WiFi downlink or
VLC downlink；Further, when user terminal is always according to mobile between zones of different of user terminal carrier, if can
Receive VLC data and/or receive the accuracy of VLC data, judging whether to the switching of downlink.
Wherein, shown in user terminal is currently located region i.e. Fig. 1: VLC overlay area, VLC overlay area
Overlapping region or non-VLC overlay area.
The movement between zones of different of the user terminal carrier includes: in VLC overlay area and non-VLC overlay area it
Between move, moved to another VLC overlay area through the overlapping region of VLC overlay area by current VLC overlay area, or non-
Move between the overlapping region of VLC overlay area and VLC overlay area.
When will be in a certain region for user terminal below, application accesses WiFi downlink or VLC downlink
Process；And during mobile between zones of different of user terminal carrier, user terminal carries out the process of network switching and enters
Row detailed description.
1, when user terminal is in a certain region, application accesses WiFi downlink or the process of VLC downlink.
As it was previously stated, user terminal is in a certain region mainly includes three kinds of situations: VLC overlay area, VLC overlay area
Overlapping region or non-VLC overlay area；The process that application accesses WiFi downlink or VLC downlink is as follows:
1) if user terminal is currently at VLC overlay area, then after user terminal receives the VLC frame that VLC focus sends,
VLC downlink access request is sent to server by WiFi up-link；Described VLC downlink access request comprises
The channel quality of ID, VLC focus of the VLC focus that user terminal obtains from VLC frame and whether there are remaining time slots feelings
Condition；
Described server positions VLC focus according to the ID of VLC focus in VLC downlink access request, and judges described
Whether the channel quality of VLC focus reaches target；If so, and there is remaining time slots, then server is by link access request
The gap information of success message and distribution controls channel by WiFi and sends to user terminal, and afterwards, user terminal uses described
VLC focus receives downlink data, thus accesses VLC downlink.
2) if user terminal is currently at non-VLC overlay area, then cannot receive VLC signal, wait for a period of time
After cannot receiving the VLC frame that VLC focus sends, sending the access of WiFi downlink by WiFi up-link to server please
Ask；After receiving the confirmation message that server returns, described user terminal accesses WiFi downlink.
3) if user terminal is currently at the overlapping region of VLC overlay area, then user terminal receives two VLC focuses
After the VLC frame sent, send VLC downlink access request by WiFi up-link to server；Described VLC downlink
Access request contains ID, VLC focus of the VLC focus that user terminal obtains from two VLC frames channel quality and
Whether there is remaining time slots situation；
After described server receives VLC downlink access request, it is determined that user terminal is currently at VLC overlay area
Overlapping region is (owing to overlapping region exists more serious presence of intercell interference, although user terminal can receive VLC frame, but connects
The optical signal received is the superposition of Liang Ge VLC community focus signal, therefore will be received by WiFi up-link as user
When the information such as the ID in VLC frame send to server, No. ID is wrong), then control channel transmission by WiFi and apply for unsuccessfully
Message is to user terminal；
After described user terminal receives application failed message, send the descending chain of WiFi by WiFi up-link to server
Road access request, and after receiving the confirmation message that server returns, access WiFi downlink.
2, during mobile between zones of different of user terminal carrier, user terminal carries out the process of network switching.
As it was previously stated, the movement that user terminal carrier is between zones of different mainly includes following three kinds of situations: at VLC
Move between overlay area and non-VLC overlay area, by current VLC overlay area through the overlapping region of VLC overlay area to separately
One VLC overlay area is moved, or moves between non-VLC overlay area and the overlapping region of VLC overlay area.User terminal
Carrier movement between zones of different, user terminal needs according to whether be able to receive that VLC data and/or receive
The accuracy of VLC data, judges whether to the switching of network.In the embodiment of the present invention, before two kinds of situation of movement need
Carrying out the switching of network, last a kind of situation, owing to user terminal cannot receive the VLC frame of VLC focus transmission or can connect
Receive wrong data, therefore, in order to ensure the stability that downlink accesses, therefore do not carry out the switching of network；Specific as follows:
1) when user terminal carrier moves between VLC overlay area and non-VLC overlay area, user terminal exists
WiFi downlink includes with VLC downlink handover process:
When user terminal carrier moves to non-VLC overlay area from VLC overlay area, VLC signal gradually weakens, and uses
Family terminal can receive wrong data, and the most described user terminal is sent by the descending chain of VLC to server by WiFi up-link
The handover request of road direction WiFi downlink, and after receiving the confirmation message that server returns, discharge the time slot of oneself, by
VLC downlink handover is to WiFi downlink；
When user terminal carrier moves to VLC overlay area from non-VLC overlay area, user terminal will receive
The VLC frame that VLC focus sends, then user terminal is sent by WiFi downlink to VLC to server by WiFi up-link
The handover request of downlink；Handover request contains ID, VLC focus of the VLC focus that user terminal obtains from VLC frame
Channel quality and whether there is remaining time slots situation；Described server is fixed according to the ID of VLC focus described in handover request
Position VLC focus, and judge whether the channel quality of described VLC focus reaches target；And there is remaining time slots, then if so,
The gap information of handover request success message and distribution is controlled channel by WiFi and sends to user terminal by server, afterwards,
User terminal by WiFi downlink handover to VLC downlink.
2) cover to another VLC through the overlapping region of VLC overlay area by current VLC overlay area when user terminal carrier
When cover region territory is moved, user terminal includes with VLC downlink handover process at WiFi downlink:
When user terminal carrier is moved the overlapping region to VLC overlay area by current VLC overlay area, described
There is area interference in the overlapping region of VLC overlay area, described user terminal can receive wrong data；Then user terminal passes through
WiFi up-link sends by VLC downlink to the handover request of WiFi downlink to server, and is receiving server
After the confirmation message returned, discharge the time slot of oneself, by VLC downlink handover to WiFi downlink；
When user terminal carrier is moved to another VLC overlay area by the overlapping region of VLC overlay area, described use
Family terminal receives the VLC frame that VLC focus sends, then user terminal is sent by under WiFi to server by WiFi up-link
Line link is to the handover request of VLC downlink；Handover request contains the VLC focus that user terminal obtains from VLC frame
The channel quality of ID, VLC focus and whether there is remaining time slots situation；Described server is according to described in handover request
The ID of VLC focus positions VLC focus, and judges whether the channel quality of described VLC focus reaches target；And deposit if so,
In remaining time slots, then the gap information of handover request success message and distribution is controlled channel transmission to using by WiFi by server
Family terminal, afterwards, user terminal by WiFi downlink handover to VLC downlink.
3) when user terminal carrier moves between non-VLC overlay area and the overlapping region of VLC overlay area, use
Family terminal cannot receive the VLC frame of VLC focus transmission or can receive wrong data；Described user terminal keeps accessing
WiFi downlink.
In the such scheme of the embodiment of the present invention, it is contemplated that overlapping region exists more serious presence of intercell interference, although use
Family terminal can receive VLC frame, but the VLC signal received is the superposition of Liang Ge VLC community focus signal, therefore works as user
When being sent to server by the information such as the ID in the VLC frame that WiFi up-link will receive, the information such as No. ID is all mistake
, say, that the VLC data that user terminal now receives are as wrong data, therefore, in order to avoid situation about going offline is sent out
Raw, user terminal needs to access (or switching) to WiFi downlink.
Above-mentioned WiFi downlink, the access of VLC downlink and handoff procedure are as in Figure 3-5；Wherein, Fig. 3 is for using
Family terminal accesses/switches to the flow chart of WiFi downlink and VLC downlink；Fig. 4 is that server is according to the letter received
Breath processes user terminal and accesses/switch to the flow chart of WiFi downlink and VLC downlink；Fig. 5 is WiFi access point
(AP) workflow diagram.
Additionally, the embodiment of the present invention also provides for a kind of VLC frame structure, each VLC focus can send descending with this frame structure
Data.As shown in Figure 6, VLC frame includes: the time slot of each user terminal under frame head and a VLC focus；Wherein: a VLC heat
Multiple user terminals under Dian use time division multiple access way distribution time slot；Frame head comprises synchronizing sequence, training sequence and VLC heat
The ID of point；Described synchronizing sequence synchronizes for VLC focus and user's receiving terminal, and training sequence is for estimating the channel of VLC focus
Quality, ID is for unique mark VLC focus.
On the other hand, in order to the effect of the embodiment of the present invention is described, l-G simulation test has also been carried out.
It is 5 seconds that simulation parameter: WiFi accesses waiting time thresholding；VLC-WiFi area coverage is 10 square metres；The area of coverage
In territory, VLC focus number is 2；Total timeslot number under each VLC focus is 10.
Simulation results as it is shown in fig. 7, in figure abscissa be VLC coverage rate, vertical coordinate is maximum user's request rate
Density (i.e. maximum user uplink request rate in the supported every square metre of region of system), this parameter shows the most greatly the property of network
Can be the best, network rate user terminal number the highest, open ended is the most.When VLC coverage rate is 0 (at initial point), maximum use
Family request rate density is 0.1, only has WiFi link because the most descending, therefore user's request rate density is relatively low；Along with VLC covers
The raising of lid rate, by the solution of the present invention, certain customers' terminal accesses VLC downlink, and remaining user terminal accesses
WiFi downlink, therefore the user capacity of network has obtained the biggest lifting；Certain due to total timeslot number subsequently, therefore maximum
User terminal requests rate densities tends towards stability when reaching certain value.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope of present disclosure, the change that can readily occur in or replacement,
All should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be as the criterion.
Claims (8)
1. a VLC-WiFi hybrid network user link accesses and the method for switching, it is characterised in that including:
In the starting stage, user terminal accesses WiFi up-link to server application；
Afterwards, the region that user terminal is currently located according to it, access WiFi downlink to server application or VLC is descending
Link；Further, when user terminal is always according to mobile between zones of different of user terminal carrier, if be able to receive that
VLC data and/or receive the accuracy of VLC data, judge whether to the switching of downlink；
Wherein, the region that user terminal is currently located includes: VLC overlay area, the overlapping region of VLC overlay area or non-
VLC overlay area；The movement between zones of different of the user terminal carrier includes: at VLC overlay area and the non-VLC area of coverage
Move between territory, moved to another VLC overlay area through the overlapping region of VLC overlay area by current VLC overlay area, or
Move between non-VLC overlay area and the overlapping region of VLC overlay area.
A kind of VLC-WiFi hybrid network user link the most according to claim 1 accesses and the method for switching, its feature
It is,
If user terminal is currently at VLC overlay area, then, after user terminal receives the VLC frame that VLC focus sends, pass through
WiFi up-link sends VLC downlink access request to server；Described VLC downlink access request contains use
The channel quality of ID, VLC focus of the VLC focus that family terminal obtains from VLC frame and whether there is remaining time slots situation；
Described server positions VLC focus according to the ID of VLC focus described in VLC downlink access request, and judges described
Whether the channel quality of VLC focus reaches target；If so, and there is remaining time slots, then server is by link access request
The gap information of success message and distribution controls channel by WiFi and sends to user terminal, and afterwards, user terminal uses described
VLC focus receives downlink data, thus accesses VLC downlink.
A kind of VLC-WiFi hybrid network user link the most according to claim 1 accesses and the method for switching, its feature
It is,
If user terminal is currently at non-VLC overlay area, then cannot receive VLC signal, cannot connect waiting for a period of time
After receiving the VLC frame that VLC focus sends, send WiFi downlink access request by WiFi up-link to server；?
After receiving the confirmation message that server returns, described user terminal accesses WiFi downlink.
A kind of VLC-WiFi hybrid network user link the most according to claim 1 accesses and the method for switching, its feature
It is,
If user terminal is currently at the overlapping region of VLC overlay area, then user terminal receives what two VLC focuses sent
After VLC frame, send VLC downlink access request by WiFi up-link to server；Described VLC downlink accesses please
Seek the channel quality of ID, VLC focus containing the VLC focus that user terminal obtains from two VLC frames and whether deposit
In remaining time slots situation；
After described server receives VLC downlink access request, it is determined that user terminal is currently at the overlapping of VLC overlay area
Region, then control channel by WiFi and send application failed message to user terminal；
After described user terminal receives application failed message, send WiFi downlink by WiFi up-link to server and connect
Enter request, and after receiving the confirmation message that server returns, access WiFi downlink.
A kind of VLC-WiFi hybrid network user link the most according to claim 1 accesses and the method for switching, its feature
Being, when user terminal carrier moves between VLC overlay area and non-VLC overlay area, user terminal is under WiFi
Line link includes with VLC downlink handover process:
When user terminal carrier moves to non-VLC overlay area from VLC overlay area, VLC signal gradually weakens, and user is eventually
End can receive wrong data, the most described user terminal by WiFi up-link to server send by VLC downlink to
The handover request of WiFi downlink, and after receiving the confirmation message that server returns, discharge the time slot of oneself, by VLC
Downlink handover is to WiFi downlink；
When user terminal carrier moves to VLC overlay area from non-VLC overlay area, user terminal will receive VLC heat
The VLC frame that point sends, then user terminal is sent by WiFi downlink to the descending chain of VLC to server by WiFi up-link
The handover request on road；Handover request contains the channel of ID, VLC focus of the VLC focus that user terminal obtains from VLC frame
Quality and whether there is remaining time slots situation；Described server positions VLC heat according to the ID of VLC focus described in handover request
Point, and judge whether the channel quality of described VLC focus reaches target；If so, and there is remaining time slots, then server will
The gap information of handover request success message and distribution controls channel by WiFi and sends to user terminal, afterwards, and user terminal
By WiFi downlink handover to VLC downlink.
A kind of VLC-WiFi hybrid network user link the most according to claim 1 accesses and the method for switching, its feature
Be, when user terminal carrier by current VLC overlay area through the overlapping region of VLC overlay area to another VLC area of coverage
When territory is moved, user terminal includes with VLC downlink handover process at WiFi downlink:
When user terminal carrier is moved the overlapping region to VLC overlay area by current VLC overlay area, described VLC covers
There is area interference in the overlapping region in cover region territory, described user terminal can receive wrong data；Then user terminal passes through WiFi
Up-link sends by VLC downlink to the handover request of WiFi downlink to server, and returns receiving server
Confirmation message after, discharge the time slot of oneself, by VLC downlink handover to WiFi downlink；
When user terminal carrier is moved to another VLC overlay area by the overlapping region of VLC overlay area, described user is eventually
Termination receives the VLC frame that VLC focus sends, then user terminal is sent by the descending chain of WiFi to server by WiFi up-link
The handover request of road direction VLC downlink；Handover request contains the VLC focus that user terminal obtains from VLC frame ID,
The channel quality of VLC focus and whether there is remaining time slots situation；Described server is according to VLC focus described in handover request
ID position VLC focus, and judge whether the channel quality of described VLC focus reaches target；If so, and exist residue time
Gap, then the gap information of handover request success message and distribution is sent to user terminal by server by WiFi control channel,
Afterwards, user terminal by WiFi downlink handover to VLC downlink.
A kind of VLC-WiFi hybrid network user link the most according to claim 1 accesses and the method for switching, its feature
Being, when user terminal carrier moves between non-VLC overlay area and the overlapping region of VLC overlay area, user is eventually
End cannot receive the VLC frame of VLC focus transmission or can receive wrong data；Described user terminal keeps accessing under WiFi
Line link.
8. access and the side of switching according to a kind of VLC-WiFi hybrid network user link described in any one of claim 2-7
Method, it is characterised in that described VLC frame includes: the time slot of each user terminal under frame head and a VLC focus；Wherein:
Multiple user terminals under one VLC focus use time division multiple access way distribution time slot；
Frame head comprises synchronizing sequence, training sequence and the ID of VLC focus；Described synchronizing sequence connects for VLC focus and user
Receiving end synchronizes, and training sequence is for estimating the channel quality of VLC focus, and ID is for unique mark VLC focus.
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