CN110493837A - The method efficiently switched is realized in a kind of VLC/RF heterogeneous network - Google Patents
The method efficiently switched is realized in a kind of VLC/RF heterogeneous network Download PDFInfo
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- CN110493837A CN110493837A CN201910599603.0A CN201910599603A CN110493837A CN 110493837 A CN110493837 A CN 110493837A CN 201910599603 A CN201910599603 A CN 201910599603A CN 110493837 A CN110493837 A CN 110493837A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004891 communication Methods 0.000 description 15
- 230000005540 biological transmission Effects 0.000 description 10
- 238000001228 spectrum Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005315 distribution function Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
Classifications
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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
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
- H04W36/28—Reselection being triggered by specific parameters by agreed or negotiated communication parameters involving a plurality of connections, e.g. multi-call or multi-bearer connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses the method efficiently switched, the required rate Γ based on user when single user uses are realized in a kind of VLC/RF heterogeneous networkuWith the rate-valve value Γ of settingqRelationship carry out network switching；Multi-user is in use, the required rate Γ based on useruWith the channel speed Γ for being currently located VLCvRelationship carry out network switching.The method efficiently switched is realized in the VLC/RF heterogeneous network, simplifies hardware facility and reduces outage probability and time complexity, the QoE for improving user and efficiently switching.
Description
Technical field
The invention belongs to indoor visible light communication technique field, it is related to realizing in a kind of VLC/RF heterogeneous network and efficiently switches
Method.
Background technique
Wireless communication has great development in message transmission rate, mobility, coverage area and spectrum efficiency at present,
But the access for hundreds billion of equipment that face the future, growing flow demand, it is clear that radio frequency (Radio Frequency, RF) has
The frequency spectrum resource of limit is not also able to satisfy.Limited network capacity and unlimited service traffics demand, the contradiction of the two promote
People must explore new technological means to cope with the flow demand of sustainable growth.Visible light communication (Visible Light
Communication, VLC) it is to use the light of 380nm-780nm visible light wave range as information carrier, without wired letters such as optical fiber
The transmission medium in road directly transmits the communication mode of optical signal in air, it is possible to provide the available bandwidth of nearly 400THz has peace
All risk insurance is close, will not injure human eye and the advantages that not vulnerable to electromagnetic interference, while also meeting user to communication channel safety, fast
The requirement of speed, environmental protection etc..Now based on the illumination of indoor light emitting diode (Light Emitting Diode, LED) basis
Equipment can provide another high speed, safety, flexible access way as wireless access point for indoor short-distance wireless communication.
VLC/RF heterogeneous network can reduce the outage probability of receiving end, improve the transmission rate of receiving end, provide optimal user experience
Quality (Quality of Experience, QoE), suitable for the electromagnetic radiation such as hospital are small and military base strong security is answered
Use scene.The following VLC/RF heterogeneous network still needs to the QoE that user is continuously improved, and provides for the big place of the flows of the people such as hospital, airport
Higher user rate reaches the communication of high quality, high speed between person to person, people and object, object and object in conjunction with 5G, 6G.
The selection and switching of VLC/RF heterogeneous network access point at present is mostly the signal-to-noise ratio with the handling capacity of user and receiving end
For criterion, the cumulative distribution function of signal-to-noise ratio is released, reduce the outage probability of system receiving terminal and improves the transmission rate of user.
In the algorithm of user experience quality, determine whether user switches over according to the grade of user terminal QoE, although the algorithm is examined
The reduction of user's switching times is considered, but has introduced higher time complexity, has kept user higher to hardware facility when switching.It should
The standard that user switches in algorithm is exactly to be linked into optimal quantification gradation, when customer service rate requirement is high, calculates the access
The quantification gradation whether signal-to-noise ratio of point (Access Point, AP) is optimal user, this process user's request data
Time just will increase, and correspondingly increase the outage probability of receiving end.In the algorithm of preferential VLCAPs access, VLC APs is main
Communicating access point, RF AP as auxiliary communicating access point, this algorithm although make full use of visible light communication (VLC) believe
The advantages of road (lower electromagnetic interference, highly-safe, broader bandwidth etc.), higher transmission rate is provided for user.But
Be because no matter customer service rate requirement height, be all priority access VLC channel, therefore the load for accessing VLC channel is more, institute
To introduce occupancy of the user to VLC channel spectrum resource of demand low rate.User is to access network according to sequencing, with
Increasing for user, the rate that channel can be provided gradually decrease, just will affect the access of high rate user.In this way, not only drawing
Enter higher outage probability and time complexity, also greatly reduces the QoE of user.It is first in the algorithm of equal signal-to-noise ratio
First calculating user is the difference that will connect the signal-to-noise ratio and current network channel SNRs of network channel, and secondary calculates
Difference compare with the threshold value of setting, then select to switch if more than the threshold value of setting, otherwise not switch.Although the algorithm reaches
Channel SNRs are maximum, but introduce higher switching times and time complexity, signal-to-noise ratio needed for ignoring customer service
Size increases the difficulty for building hardware facility.
Summary of the invention
The object of the present invention is to provide the method efficiently switched is realized in a kind of VLC/RF heterogeneous network, hardware is simplified
Facility and reduction outage probability and time complexity, the QoE for improving user and efficiently switching.
To achieve the goals above, it the technical scheme adopted by the invention is that, is realized in a kind of VLC/RF heterogeneous network efficient
The method of switching, the required rate Γ based on user when single user usesuWith the rate-valve value Γ of settingqRelationship carry out net
Network switching；Multi-user is in use, the required rate Γ based on useruWith the channel speed Γ for being currently located VLCvRelationship come into
Row network switching.
The features of the present invention also characterized in that
Required rate Γ based on user when single user usesuWith the rate-valve value Γ of settingqRelationship cut to carry out network
It changes specifically:
After the request of data of user is delivered to master controller, master controller analyzes required rate Γu, and with setting
Rate-valve value ΓqIt compares, issues to issue orders:
If Γu> Γq, then it is directly connected in VLC network；
If Γu< Γq, then it is directly connected in RF network；
If Γu=Γq, access load few VLC network or RF network.
Required rate Γ based on user when multi-user usesuWith the rate Γ for being currently located VLC networkvRelationship come into
Row network switching specifically:
After the request of data of user is delivered to master controller, master controller analyzes required rate Γu, and with it is current
The channel speed Γ of VLC networkvIt compares, issues to issue orders:
If Γv< Γu, then user is entered in current VLC network by horizontal handoff, otherwise without horizontal handoff.
Single user, the request of data of multi-user realizing and user and master controller as uplink using RF network
Between information conveyance.
When being used as link of RF network, when being used as link of modulation system OFDM, VLC network, modulation system is
OOK。
The beneficial effects of the present invention are: realizing the method efficiently switched in a kind of (1) VLC/RF heterogeneous network of the invention, drop
Low time complexity, improves user service Quality of experience, user need to only calculate the current shape of user when selecting downlink
Rate needed for state, compared with the threshold value of setting, as long as the channel of current network meet active user's business needed for rate,
Corresponding network just may be selected to access as downlink；(2) efficiently switching is realized in a kind of VLC/RF heterogeneous network of the invention
Method simplify hardware facility, go switching only using the rate of customer service demand as measurement standard, if network channel meet use
The rate requirement at family, then the user is horizontally or vertically switched, and is otherwise maintained for the connection of current network；(3) of the invention
Realize that the method efficiently switched reduces the outage probability of user in a kind of VLC/RF heterogeneous network, when user switches only with customer service
The rate of demand is related, although user has the requirements such as handling capacity is big, signal-to-noise ratio is high, the bit error rate is low to communication link, need to only expire
The rate of sufficient customer service demand.
Specific embodiment
Technical solution of the present invention is described in detail With reference to embodiment.
The method efficiently switched is realized in a kind of VLC/RF heterogeneous network of the invention, specifically:
When single user, after the request of data of user is delivered to master controller, master controller analyzes required rate
Γu, and the rate-valve value Γ with settingqIt compares, issues to issue orders:
If Γu> Γq, then it is directly connected in VLC network；
If Γu< Γq, then it is directly connected in RF network；
If Γu=Γq, access load few VLC network or RF network.
When multi-user, after the request of data of user is delivered to master controller, master controller analyzes required rate
Γu, and the channel speed Γ with current VLC networkvIt compares, issues to issue orders:
If Γv< Γu, then user is entered in current VLC network by horizontal handoff, otherwise without horizontal handoff.
When single user, user is had to enter into the mixing heterogeneous network of VLC/RF first, and the antenna of user is believed by RF
The uplink in road gives detector signal, learns the request of user data, and selecting the uplink of RF channel is because of VLC
Channel is difficult to realize full-duplex communication, the interference of the uplink of VLC channel by downlink light, and visible light communication uplink
The dynamic reference range of link rate is only [80kbps, 120kbps], and the dynamic model of the uplink peak rate of RF channel
It encloses, can achieve [3000kbps, 9000kbps].When the downlink of RF channel receives the request of data of user, by user
Request of data is sent to master controller, according to rate needed for the threshold value of the setting stored in master controller and customer service
Height, master controller judges which type of network meets its rate requirement, and user just accesses the downlink of the network.
If Γv< Γu, but corresponding network loads when reaching certain amount, and receiving end will do it Vertical Handover (Vertical Handover
Refer in heterogeneous wireless network, the switching between different access networks), the outage probability of user is effectively reduced, is realized
User efficiently switches.
In real life, not only one user in a VLC/RF heterogeneous network, may there are two and it is more than two
User, so present invention also proposes the methods of multiple access in conjunction with actual conditions.In order to reduce the complex nature of the problem, RF letter
Road is only used for uplink and carries out information transmission, the selection of user's downlink horizontal handoff between VLC APs.
Multiple users only consider the step of access of VLC channel:
There are two first or more than two users enter in the heterogeneous network of VLC/RF, identical as single user, by RF
Channel is used to complete the information transmission of uplink, and is sent to it request of data, and RF channel is as the modulation system of link
OFDM, VLC channel are OOK as the modulation system of link.
When RF channel receives the request of data of user, user data requests are sent to master controller, are calculated current
VCL channel can be provided to the flank speed of user.Calculate will access VLC channel customer service (see video, play games,
Browsing webpage, stroll Taobao, downloading file or video etc.) rate size.By comparing the rate of customer service demand and current
VLC channel can be provided to the maximum rate of user.If channel speed is greater than the rate of user's request, user carries out horizontal cutting
It changes, otherwise user keeps the connection of current network.
When user enters in the superimposed coverage area of two neighboring VLC APs, master controller can detect optical signal,
But due to can not be decoded the problem of the interference of light between the access point of visible light communication be which VLC AP ID sequence information.
User sends specific information to master controller by the uplink of RF channel at the same time, and master controller is known that use
Family is located at the overlapping region VLC APs, then the data transmission of user is completed by the downlink of RF channel.
System model: indoor environment includes N number of VLC APs and single Wi-Fi AP, and is placed on ceiling and uses
Power line is connected to the same CU.Because visible light has the function of to illuminate and communicate two kinds, so the rational deployment to VLC APs is first
First meet illumination.Downlink disturbs to the light of uplink when visible light communication realizes full-duplex communication, VLC letter
The uplink in road is difficult to realize the transmission of information, so, the uplink of user of the present invention is carried out data transmission by RF channel,
Only the horizontally or vertically switching of user's downlink is studied.But determine that user is located at covering for which VLC AP for convenience of CU
VLC APs is distributed different ID sequences, and is stored in master controller by lid domain, and master controller detects different ID sequences
To determine user is the coverage area positioned at which VLC AP.
Claims (5)
1. realizing the method efficiently switched in a kind of VLC/RF heterogeneous network, which is characterized in that based on user's when single user uses
Required rate ΓuWith the rate-valve value Γ of settingqRelationship carry out network switching；Multi-user is in use, based on needed for user
Rate ΓuWith the channel speed Γ for being currently located VLCvRelationship carry out network switching.
2. realizing the method efficiently switched in VLC/RF heterogeneous network according to claim 1, which is characterized in that single user makes
Required rate Γ of the used time based on useruWith the rate-valve value Γ of settingqRelationship carry out network switching specifically:
After the request of data of user is delivered to master controller, master controller analyzes required rate Γu, and the speed with setting
Rate threshold value ΓqIt compares, issues to issue orders:
If Γu> Γq, then it is directly connected in VLC network；
If Γu< Γq, then it is directly connected in RF network；
If Γu=Γq, access load few VLC network or RF network.
3. realizing the method efficiently switched in VLC/RF heterogeneous network according to claim 2, which is characterized in that multi-user makes
Required rate Γ of the used time based on useruWith the rate Γ for being currently located VLC networkvRelationship carry out network switching specifically:
After the request of data of user is delivered to master controller, master controller analyzes required rate Γu, and with current VLC net
The channel speed Γ of networkvIt compares, issues to issue orders:
If Γv< Γu, then user is entered in current VLC network by horizontal handoff, otherwise without horizontal handoff.
4. realizing the method efficiently switched in VLC/RF heterogeneous network according to claim 3, which is characterized in that single user,
The request of data of multi-user is realized using RF network as uplink and the information conveyance between user and master controller.
5. realizing the method efficiently switched in VLC/RF heterogeneous network according to claim 4, which is characterized in that RF network
When as link, when being used as link of modulation system OFDM, VLC network, modulation system OOK.
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| CN201910599603.0A CN110493837B (en) | 2019-07-04 | 2019-07-04 | Method for realizing efficient switching in VLC/RF heterogeneous network |
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Effective date of registration: 20231130 Address after: Room 858, 8th Floor, SEG Computer City, No.8 Yanta Road Middle Section, Beilin District, Xi'an City, Shaanxi Province, 710054 Patentee after: Shaanxi Qibang Ruili Electronic Technology Co.,Ltd. Address before: 710048 Shaanxi province Xi'an Beilin District Jinhua Road No. 5 Patentee before: XI'AN University OF TECHNOLOGY |