CN106412999A - Load balancing method and load balancing system - Google Patents
Load balancing method and load balancing system Download PDFInfo
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- CN106412999A CN106412999A CN201611032773.3A CN201611032773A CN106412999A CN 106412999 A CN106412999 A CN 106412999A CN 201611032773 A CN201611032773 A CN 201611032773A CN 106412999 A CN106412999 A CN 106412999A
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- reception device
- radio reception
- load
- balancing
- signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- Computer Networks & Wireless Communication (AREA)
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- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a load balancing method and a load balancing system. The method is characterized by through a wireless access control server, establishing a load balancing group, assigning main wireless access equipment, generating a load balancing information table of the load balancing group and storing to all the wireless access equipment; detecting whether the wireless access equipment with highest receiving signal intensity satisfies a load balancing threshold, if the wireless access equipment satisfies the load balancing threshold, associating equipment to be accessed with the wireless access equipment; otherwise, through the load balancing information table, measuring and calculating service quality coefficients of all the wireless access equipment of the load balancing group and determining the wireless access equipment which allows the equipment to access. By using the load balancing method and the load balancing system, a high quality network service is provided and simultaneously frequencies of states of all the wireless access equipment which can be accessed and is scanned by the equipment to be accessed can be reduced, and a connection and network access speed of the equipment to be accessed can be increased. Simultaneously, a condition that the equipment to be accessed acquires load information condition of the wireless access equipment can be avoided and safety of a WLAN network system is increased.
Description
Technical field
The present invention relates to network insertion load balancing field, more particularly, to a kind of load-balancing method and load balancing system
System.
Background technology
Commonly used in each field with various communication equipments, at present, more and more equipment (tion) to be accessed needs
Rapidly to connect networking, and keep the networking speed of high speed simultaneously.Now, when multiple equipment to be accessed need access network
When, the burden of single radio reception device radio reception device (Access Point wireless access node), may lead
Cause radio reception device cannot undertake, the equipment to be accessed of access cannot obtain good using effect.
In prior art, typically by AC (Access Point Controller wireless access control especially in wlan system
Control server) and multiple stage radio reception device composition, wherein AC is responsible for the data from different radio access device to be converged
Coalescence access network, complete simultaneously the configuration management of radio reception device equipment, the certification of wireless user, management and broadband-access,
The control functions such as safety.
In wlan system, equipment to be accessed generally all can be connected to RSSI (Received Signal Strength
The signal strength signal intensity instruction that Indication accepts) on the strongest radio reception device that is to say, that when multiple equipment request connects
, wireless connection that RSSI radio reception device the strongest is set up will compare many, and relatively weak wirelessly the connecing of RSSI
Entering the wireless connection that equipment sets up can seldom, and this largely can cause load imbalance between radio reception device, no
Effectively utilizes beneficial to resource in wlan system.
And existing load balancing scheme needs equipment to be accessed to scan all wireless access that can connect in the pre-connection
The state of equipment, obtain radio reception device is currently accessed number and current access total flow, and therefrom choosing is currently accessed number
Less or being currently accessed the little radio reception device of total flow is wirelessly connected.But, this kind of solution exist with
Some problem lower：
Equipment to be accessed needs first to scan the state of all radio reception devices having access to before accessing, and directly results in and treats
Access device turn-on time is long, reduces access speed, leads to using effect not good；
Equipment to be accessed always needs to scan the state of all radio reception devices having access to before accessing, and easily causes
Repeat to obtain state and the load-balancing information of all radio reception devices in short time, lead to the wasting of resources, reduce using effect
Rate；
Equipment to be accessed can obtain the current access number of radio reception device and current access total flow, wirelessly connects
The load-balancing information entering equipment needs external coordination to equipment to be accessed, is that network security hides some dangers for.
Therefore, how efficiently and safely realize the load balancing of wlan network system, raising equipment to be accessed connect into
The speed of net, effectively improves the service efficiency of wlan network system, is problem demanding prompt solution in current load balancing scheme.
Content of the invention
The present invention is directed to that the turn-on time lead in load balancing scheme in prior art is long, network resource utilization mistake
Low and radio reception device load-balancing information leaks the deficiencies such as harm system safety, discloses a kind of load-balancing method and negative
Carry equalizing system, that is, by setting up load balancing group, setting up load balancing table, reduce the institute that equipment surface sweeping to be accessed has access to
There is the frequency of radio reception device state, it is possible to increase equipment to be accessed connects the speed networking.Simultaneously and it can be avoided that waiting
Enter the load information situation that equipment gets radio reception device, improve the security of wlan network system.
A kind of load-balancing method that the present invention provides, comprises the steps：
Step 1, described wireless access control server set up load balancing group, and described load balancing group at least includes 2
Radio reception device, and specify radio reception device based on one of radio reception device；
Step 2, described main radio reception device send the request of query load situation to remaining radio reception device, according to sound
The load-balancing information table of described load balancing group should be generated, and to the broadcast of remaining radio reception device；
Step 3, remaining described radio reception device receive described load-balancing information table and store；
Step 4, described wireless access control server detect and accept signal strength signal intensity radio reception device the strongest in group；
Step 5, the described signal strength signal intensity radio reception device the strongest that accepts determine current permission by load-balancing algorithm
The described radio reception device accessing.
According to a preferred embodiment of the invention：Described step 2 specifically includes：
Step 20：The broadcast cycle of the main radio reception device of described wireless access control server settings；
Step 21：Described main radio reception device is pressed broadcast cycle and is periodically sent broadcast report to remaining radio reception device
Literary composition；
Step 22：Remaining described radio reception device after receiving the broadcasting packet that described main radio reception device sends,
The loading condition of itself is replied described main radio reception device, described loading condition includes being currently accessed number and currently always flows
Amount；
Step 23：Described main radio reception device receives the described load feelings that remaining described radio reception device is replied
After condition, update the loading condition of itself, and generate the load-balancing information table of described load balancing group；
Step 24：Described load-balancing information table is broadcasted and is set to wireless access remaining described by described main radio reception device
Standby.
According to a preferred embodiment of the invention：Also include after described step 4：
Step 40：In load balancing group described in described wireless access control server settings, arbitrary radio reception device is negative
Carry threshold value, described load threshold includes accessing number trimming threshold and flow equalization threshold value；
Step 41：Described wireless access control server detects that the described signal strength signal intensity radio reception device the strongest that accepts is
No meet load balancing；
Including detect described accept signal strength signal intensity radio reception device the strongest be currently accessed number and/or present flow rate be
No less than load balancing threshold value；
If being less than, permission access is described to accept signal strength signal intensity radio reception device the strongest；
Otherwise, go to step 5.
According to a preferred embodiment of the invention：In described step 5, load-balancing algorithm is
Q=kr*r+kf*(1-f)+ku* (1-u), wherein, Q is service quality coefficient, and Q value is bigger, and service quality is higher；
krFor accepting the design factor of signal strength signal intensity, kfFor total flow design factor, kuFor accessing number design factor, u is use
Family load factor, f is the flow load factor.
According to a preferred embodiment of the invention：Described step 5 comprises the steps：
Step 50：Described wireless access control server settings accept the design factor of signal strength signal intensity, total flow calculates system
Number, access number design factor；
Step 51：The described described load-balancing information accepting signal strength signal intensity radio reception device inquiry preservation the strongest
Table, obtain remaining described radio reception device accepts signal strength signal intensity, and calculates the user load factor and the flow load factor；
Wherein, when the number that is currently accessed of described radio reception device is less than access number trimming threshold, then described user load
The factor is 0；Otherwise, the described user load factor is 1；
When the current total flow of described radio reception device is less than flow equalization threshold value, then the described flow load factor is 0；
Otherwise, the described flow load factor is 1.
Step 53：Described accept signal strength signal intensity radio reception device the strongest calculated by load-balancing algorithm all
The Q value of described radio reception device；
Step 54：The described signal strength signal intensity radio reception device the strongest that accepts relatively draws maximum Q value, and determines correspondence
Described radio reception device be the current radio reception device allowing and accessing.
According to a preferred embodiment of the invention：Also comprise the steps after described step 5：
Step 60：The described signal strength signal intensity radio reception device the strongest that accepts sends probe messages, report to equipment to be accessed
The information of the described radio reception device allowing and accessing is comprised in literary composition；
Step 61：Described equipment to be accessed receives the described probe messages accepting signal strength signal intensity radio reception device the strongest
Afterwards, the radio reception device accessing to the described permission that described detection Bao Wenzhong specifies sends association request.
According to a preferred embodiment of the invention：Also include before step 1：
Step 00：Described wireless access control server settings maximum stream flow threshold value, described maximum access quantity threshold value；
Step 01：The current total flow of all described radio reception device real-time monitorings itself, if described current total flow
During more than maximum stream flow threshold value, then corresponding described radio reception device is excluded in described load balancing group, is not involved in bearing
Carry equilibrium, and do not allow to access new equipment described to be accessed；
Step 02：All described radio reception device real-time monitorings itself be currently accessed number, if described be currently accessed number
During more than maximum access quantity threshold value, then corresponding described radio reception device is excluded in described load balancing group, is not involved in
Load balancing, and do not allow to access new equipment described to be accessed.
Present invention also offers a kind of SiteServer LBS, connect a plurality of including a wireless access control server with wirelessly
Enter equipment, wherein：
Wireless access control server includes initialization unit, detector unit；
Described radio reception device includes radio unit, signal generating unit, memory cell, identifying unit；
Described initialization unit, for setting up the load balancing group at least including 2 radio reception devices, for specifying master
Radio reception device,
Described detector unit, accepts signal strength signal intensity radio reception device the strongest for detection；
Described radio unit, for broadcast query loading condition request simultaneously broadcast load equalization information table；
Described signal generating unit, generates the load-balancing information table of described load balancing group according to response；
Described memory cell, for storing the described load-balancing information table receiving；
Described identifying unit, for determining the current radio reception device allowing and accessing by load-balancing algorithm.
According to a preferred embodiment of the invention：
Described initialization unit, for setting the broadcast cycle of main radio reception device；
Described radio unit, for periodically sending broadcasting packet to remaining radio reception device by broadcast cycle；
Remaining described radio reception device after receiving the broadcasting packet that described main radio reception device sends, by itself
Loading condition replys described main radio reception device, and described loading condition includes being currently accessed number and current total flow；
After described main radio reception device receives the described loading condition that remaining described radio reception device is replied, more
The new loading condition of itself；
The signal generating unit of described main radio reception device, generates the load-balancing information table of described load balancing group；
Described load-balancing information table is broadcasted and is wirelessly connect to remaining described by the radio unit of described main radio reception device
Enter equipment.
According to a preferred embodiment of the invention：
Described initialization unit, for setting the load threshold of arbitrary radio reception device in described load balancing group, institute
State load threshold to include accessing number trimming threshold and flow equalization threshold value；
Described detector unit, described accepts whether signal strength signal intensity radio reception device the strongest meets load all for detecting
Weighing apparatus；
Including detect described accept signal strength signal intensity radio reception device the strongest be currently accessed number and/or present flow rate be
No less than load balancing threshold value, if being less than, allowing to access and described accept signal strength signal intensity radio reception device the strongest；Otherwise,
The described signal strength signal intensity radio reception device the strongest that accepts determines the described wireless of current permission access by load-balancing algorithm
Access device.
According to a preferred embodiment of the invention：Described load-balancing algorithm is
Q=kr*r+kf*(1-f)+ku* (1-u), wherein, Q is service quality coefficient, and Q value is bigger, and service quality is higher；
krFor accepting the design factor of signal strength signal intensity, kfFor total flow design factor, kuFor accessing number design factor, u is use
Family load factor, f is the flow load factor.
According to a preferred embodiment of the present invention：Described initialization unit, for set accept signal strength signal intensity design factor,
Total flow design factor, access number design factor；
The described described load-balancing information table accepting signal strength signal intensity radio reception device inquiry preservation the strongest, obtains it
Remaining described radio reception device accept signal strength signal intensity；
Described identifying unit, for calculating the user load factor and the flow load factor；
Wherein, when the number that is currently accessed of described radio reception device is less than access number trimming threshold, then described user load
The factor is 0；Otherwise, the described user load factor is 1；
When the current total flow of described radio reception device is less than flow equalization threshold value, then the described flow load factor is 0；
Otherwise, the described flow load factor is 1.
Described identifying unit, calculates the Q value of all described radio reception devices, maximum Q by load-balancing algorithm
Being worth corresponding radio reception device is the current radio reception device allowing and accessing.
According to a preferred embodiment of the invention：The described signal strength signal intensity radio reception device the strongest that accepts sets to be accessed
Preparation send probe messages, comprises the information of the described radio reception device allowing and accessing in message；
After described equipment to be accessed receives the described probe messages accepting signal strength signal intensity radio reception device the strongest, to institute
State the radio reception device transmission association request detecting the described permission access that Bao Wenzhong specifies.
According to a preferred embodiment of the invention：Described initialization unit, for setting maximum stream flow threshold value, maximum access
Number threshold value；
The current total flow of all described radio reception device real-time monitorings itself, if described current total flow is more than maximum
During flow threshold, then corresponding described radio reception device is excluded in described load balancing group, is not involved in load balancing, and
Do not allow to access new equipment described to be accessed；
All described radio reception device real-time monitorings itself be currently accessed number, if described be currently accessed number more than maximum
When accessing number threshold value, then corresponding described radio reception device is excluded in described load balancing group, is not involved in load balancing,
And do not allow to access new equipment described to be accessed.
By above solution, the invention has the advantages that：
Firstth, the main radio reception device in load balancing group periodically in inquiry group remaining radio reception device negative
Load equilibrium state, and generate the load-balancing information table of all radio reception devices in group, need not equipment acquisition to be accessed own
The load information of radio reception device, reduces equipment power dissipation to be accessed；
Secondth, equipment to be accessed goes to obtain by load-balancing algorithm by accepting signal strength signal intensity radio reception device the strongest
Take the radio reception device that service quality is best, improve the speed that equipment to be accessed obtains information, thus improve connecting networking
Speed；
3rd, service quality coefficient is calculated by radio reception device, and the load-balancing information of radio reception device is not
Can leak to equipment to be accessed, enhance the security of wlan system.
4th, signal strength signal intensity is the strongest, access number, total flow etc. as parameter to accept for service quality coefficient, completely contains
The situation of impact load balancing, and computing formula is simple.
Brief description
Fig. 1 is a kind of schematic flow sheet of load-balancing method of the present invention；
Fig. 2 be the present invention a kind of load-balancing method in step 2 schematic flow sheet；
Fig. 3 be the present invention a kind of load-balancing method in step 4 schematic flow sheet；
Fig. 4 be the present invention a kind of load-balancing method in step 5 schematic flow sheet；
Fig. 5 is a kind of schematic flow sheet of the preferred embodiment of load-balancing method of the present invention；
Fig. 6 is a kind of system schematic of SiteServer LBS of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, in order to just
Part related to the present invention rather than entire infrastructure is illustrate only in description, accompanying drawing.
The embodiment of the present invention is for equipment access network overlong time to be accessed, wlan system utilization rate in prior art not
High, radio reception device facility information easily leaks to equipment to be accessed, the not high full shortcoming of degree of safety, discloses a kind of load
Equalization methods and SiteServer LBS, can improve the speed that linking of devices to be accessed networks, and set by calculating each wireless access
Standby service quality coefficient, the higher radio reception device of distribution service quality connects equipment to be accessed, is finally reached efficient, fast
The load balancing effect of speed.
Fig. 1 is a kind of schematic flow sheet of load-balancing method of the present invention.As shown in figure 1, the method shown in the present invention
Comprise the steps：
Step 1, described wireless access control server set up load balancing group, and described load balancing group at least includes 2
Radio reception device, and specify radio reception device based on one of radio reception device；
Step 2, described main radio reception device send the request of query load situation to remaining radio reception device, according to sound
The load-balancing information table of described load balancing group should be generated, and to the broadcast of remaining radio reception device；
Step 3, remaining described radio reception device receive described load-balancing information table and store；
Step 4, described wireless access control server detect and accept signal strength signal intensity radio reception device the strongest in group；
Step 5, the described signal strength signal intensity radio reception device the strongest that accepts determine current permission by load-balancing algorithm
The described radio reception device accessing.
In the present invention, equipment to be accessed need not carry out load state inquiry to each radio reception device, in load balancing group
All radio reception devices be all stored with load-balancing information table, accept the strongest (RSSI) the highest wireless access of signal strength signal intensity
Equipment can calculate determination by the load-balancing information table of inquiry itself storage, by load-balancing algorithm and provide access service
Radio reception device, and the information of this radio reception device is conveyed to equipment to be accessed, effectively improve the company of equipment to be accessed
Connect speed and ensure the information security of wlan system.
Further, Fig. 2 is a kind of schematic flow sheet of the step 2 of load-balancing method of the present invention, specifically includes：
Step 20：The broadcast cycle of the main radio reception device of described wireless access control server settings；
Step 21：Described main radio reception device periodically sets to remaining wireless access described in group according to described broadcast cycle
Preparation send broadcasting packet (LDB_REQUEST message), the loading condition of other radio reception devices in query load equilibrium group；
Step 22：Remaining described radio reception device is receiving the broadcasting packet LDB_ that described main radio reception device sends
After REQUEST, the loading condition of itself is replied described main wireless access by UDP unicast message (LDB_RESPONSE message)
Equipment, what described loading condition included described radio reception device is currently accessed several ucurrAnd current total flow fcurr；
Step 23：Described main radio reception device receives remaining described radio reception device by LDB_RESPONSE message
After the described loading condition replied, update the described main radio reception device loading condition of itself, and generate described load balancing
The load-balancing information table of group；
Step 24：Described main radio reception device broadcasts described load-balancing information table to (L DB_UPDATE message)
Remaining described radio reception device；
Further, Fig. 3 is a kind of schematic flow sheet of the step 4 of load-balancing method of the present invention, specifically includes：
Step 40：In load balancing group described in described wireless access control server settings, arbitrary radio reception device is negative
Carry threshold value, described load threshold includes accessing number trimming threshold and flow equalization threshold value；
Step 41：Described wireless access control server detects that the described signal strength signal intensity radio reception device the strongest that accepts is
No meet load balancing；
Including detect described accept signal strength signal intensity radio reception device the strongest be currently accessed number and/or present flow rate be
No less than load balancing threshold value；
If being less than, permission access is described to accept signal strength signal intensity radio reception device the strongest；
Otherwise, go to step 5.
Non-load balanced case typically accesses quantity by current equipment to be accessed and current total flow is weighed, therefore,
When whether multilevel iudge RSSI radio reception device the strongest meets load balancing condition, it is also to be accessed by current equipment
Quantity and current total flow are judging.
As shown in figure 3, in step S41, only accept signal strength signal intensity radio reception device the strongest is currently accessed number
ucurrAnd current total flow fcurrIt is respectively less than user access set in advance number trimming threshold uldbAnd flow equalization threshold value fldbWhen,
Just can be judged as that this radio reception device meets load balancing and requires it is allowed to equipment to be accessed accesses；As long as accessing number ucurrAnd
Total flow fcurrIn have arbitrary be unsatisfactory for load balancing threshold value, then be judged to not meet load balancing and require, do not allow to be accessed
Equipment accesses.
Certainly, it is to reach under high-level non-load balanced case shown in Fig. 3, simultaneously to being currently accessed several ucurrAnd it is current
Total flow fcurrThe method carrying out threshold restriction.When the load balancing that need not reach highest standard, also can be only to access number ucurrOr
Total flow fcurrIn any value carry out threshold decision.It is understood as the change expected without creative work, still
Cover within the scope of the present invention.
Further, Fig. 4 is a kind of schematic flow sheet of the step 5 of load-balancing method of the present invention, specifically includes as follows
Step：
Step 50：Described wireless access control server settings accept the design factor k of signal strength signal intensity (RSSI) value rr, total
Flow rate calculation coefficient kf, access number design factor ku；
Step 51：The described described load-balancing information accepting signal strength signal intensity radio reception device inquiry preservation the strongest
Table, obtain remaining described radio reception device accepts signal strength signal intensity r, and calculates user load factor u, calculated flow rate load because
Sub- f；
Wherein, as the access number u of described radio reception devicecurrLess than the access number trimming threshold u settingldb, then load
Factor u is 0；If the access number u of described radio reception devicecurrMore than or equal to maximum access quantity threshold value u settingmax, then load
Factor u is 1；
Total flow f when described radio reception devicecurrLess than described flow equalization threshold value f settingldb, then described stream
Amount load factor f is 0；If total flow f of described radio reception devicecurrMore than or equal to the described flow equalization threshold value setting
fldb, then described flow load factor f is 1.
Step 52：Described accept signal strength signal intensity radio reception device the strongest calculated by load-balancing algorithm all
The Q value of described radio reception device, Q=kr*r+kf*(1-f)+ku*(1-u)；
Step 53：The described signal strength signal intensity radio reception device the strongest that accepts relatively draws maximum Q value, and determines correspondence
Described radio reception device be the current radio reception device allowing and accessing.
In the embodiment of the present invention, load balancing threshold value cannot be met when accepting signal strength signal intensity radio reception device the strongest
When, described radio reception device inquires about the load-balancing information table of itself storage, by formula Q=kr*r+kf*(1-f)+ku*
(1-u) calculate highest service quality coefficient, and match corresponding radio reception device.This radio reception device is fair
Permitted the radio reception device that equipment to be accessed accesses.
In a kind of load-balancing method that the present invention provides, the calculating of service quality coefficient is with RSSI, radio reception device
Traffic load, the network equipment number of radio reception device association etc. be parameter, taken into account RSSI, total flow, user
Number, prevent the network equipment to be associated with far radio reception device, that is, reached make the network equipment associate be associated with nearby negative
Carry the purpose on lighter radio reception device.
Further, after determining described accessible radio reception device, comprise the steps：
Step 60：The described signal strength signal intensity radio reception device the strongest that accepts sends probe messages, report to equipment to be accessed
The information of the described radio reception device allowing and accessing is comprised in literary composition；
Step 61：Described equipment to be accessed receives the described probe messages accepting signal strength signal intensity radio reception device the strongest
Afterwards, the radio reception device accessing to the described permission that described detection Bao Wenzhong specifies sends association request.
In the present embodiment, described equipment to be accessed gets always by accepting signal strength signal intensity radio reception device the strongest
The information of the optimum radio reception device of service quality coefficient, and accept signal strength signal intensity radio reception device the strongest be RSSI
Strong radio reception device, that is, always strong with the RSSI signal radio reception device of described equipment to be accessed communicated, carry
The speed that high information exchanges, is conducive to quickly connecting networking.
Further, carrying out before step 1 opens load balancing, following steps being carried out：
Step 00：Described wireless access control server settings maximum stream flow threshold value, described maximum access quantity threshold value；
Step 01：The current total flow of all described radio reception device real-time monitorings itself, if described current total flow
During more than maximum stream flow threshold value, then corresponding described radio reception device is excluded in described load balancing group, is not involved in bearing
Carry equilibrium, and do not allow to access new equipment described to be accessed；
Step 02：All described radio reception device real-time monitorings itself be currently accessed number, if described be currently accessed number
During more than maximum access quantity threshold value, then corresponding described radio reception device is excluded in described load balancing group, is not involved in
Load balancing, and do not allow to access new equipment described to be accessed.
Further, the present invention provides the preferred embodiment of a load-balancing method.As shown in figure 5, specifically include as
Lower step：
Open load-balancing function, set up load balancing group, described load balancing group at least includes 2 wireless access and sets
Standby, and specify a main radio reception device；
Set dependent thresholds, the broadcast cycle of main radio reception device, dependent thresholds are arbitrary in described load balancing group
The access number trimming threshold u of radio reception deviceldbAnd flow equalization threshold value fldb；
All described radio reception device real-time monitoring total flows f of itselfcurrIf, described total flow fcurrMore than maximum
Flow threshold fmaxWhen, then corresponding described radio reception device is excluded in described load balancing group, is not involved in load all
Weighing apparatus, and do not allow to access new described equipment；
The access number u of all described radio reception device real-time monitorings itselfcurrIf, described access number ucurrMore than maximum
Access number threshold value uldbWhen, then corresponding described radio reception device is excluded in described load balancing group, is not involved in load all
Weighing apparatus, and do not allow to access new described equipment；
Update load balancing group and main radio reception device；
Generate the load-balancing information table of described load balancing group and store to all radio reception devices；
Judge RSSI value r highest radio reception device, and detect whether this radio reception device meets load balancing
Threshold value；
If meeting, described equipment to be accessed connects to this radio reception device；
Conversely, being unsatisfactory for load balancing threshold value, then described RSSI value r highest radio reception device is by described load
The service quality coefficient Q that all described radio reception devices of load balancing group calculated by equalization information table determines what permission equipment accessed
Radio reception device, wherein service quality coefficient Q pass through formula Q=kr*r+kf*(1-f)+ku* (1-u) calculates；
Described RSSI value r highest radio reception device sends probe messages to described equipment to be accessed, comprises in message
The information of described service quality coefficient Q highest radio reception device；
After described equipment to be accessed receives the probe messages of described RSSI value r highest radio reception device, to described spy
Survey the described service quality coefficient Q highest radio reception device transmission association request that Bao Wenzhong specifies.
Meanwhile, as shown in fig. 6, the present invention also provides a kind of SiteServer LBS, the main wireless access control that includes takes
Business device 00 and a plurality of radio reception device 10；
Described wireless access control server 00 includes initialization unit 01, detector unit 02；
Described radio reception device 10 includes radio unit 11, signal generating unit 12, memory cell 13, identifying unit 14；
Described initialization unit 01, for setting up the load balancing group at least including 2 radio reception devices 10, for referring to
Fixed main radio reception device 100,
Described detector unit 02, accepts signal strength signal intensity radio reception device the strongest 101 for detection；
Described radio unit 11, for broadcast query loading condition request simultaneously broadcast load equalization information table；
Described signal generating unit 12, generates the load-balancing information table of described load balancing group according to response；
Described memory cell 13, for storing the described load-balancing information table receiving；
Described identifying unit 14, for determining the current radio reception device 102 allowing and accessing by load-balancing algorithm.
Further, described initialization unit 01, for setting the broadcast cycle of main radio reception device 100；
Described radio unit 11, for periodically sending broadcasting packet to remaining radio reception device 10 by broadcast cycle；
Remaining described radio reception device 10, will after receiving the broadcasting packet that described main radio reception device 100 sends
The loading condition of itself replys described main radio reception device 100, and described loading condition includes being currently accessed number and currently always flows
Amount；
Described main radio reception device 100 receives the described loading condition that remaining described radio reception device 10 is replied
Afterwards, update the loading condition of itself；
The signal generating unit 12 of described main radio reception device 100, generates the load-balancing information table of described load balancing group；
The radio unit 11 of described main radio reception device 100 broadcasts described load-balancing information table to nothing remaining described
Line access device.
Further, described initialization unit 01, for setting arbitrary radio reception device 10 in described load balancing group
Load threshold, described load threshold includes accessing number trimming threshold and flow equalization threshold value；
Described detector unit 02, described accepts whether signal strength signal intensity radio reception device the strongest 101 meets for detecting
Load balancing；
Described accept being currently accessed number and/or current flowing of signal strength signal intensity radio reception device the strongest 101 including detecting
Whether amount is less than load balancing threshold value, if being less than, permission access is described to accept signal strength signal intensity radio reception device the strongest
101；Otherwise, the described signal strength signal intensity radio reception device the strongest 101 that accepts determines currently to allow to connect by load-balancing algorithm
The described radio reception device 102 entering.
Described load-balancing algorithm is Q=kr*r+kf*(1-f)+ku* (1-u), wherein, Q is service quality coefficient, and Q value is got over
Greatly, service quality is higher；
krFor accepting the design factor of signal strength signal intensity, kfFor total flow design factor, kuFor accessing number design factor, u is use
Family load factor, f is the flow load factor.
Further, described initialization unit 01, for setting the design factor accepting signal strength signal intensity, total flow calculates system
Number, access number design factor；
The described described load-balancing information table accepting signal strength signal intensity radio reception device the strongest 101 inquiry preservation, obtains
Take remaining described radio reception device accepts signal strength signal intensity；
Described identifying unit 14, for calculating the user load factor and the flow load factor；
Wherein, when the number that is currently accessed of described radio reception device 10 is less than access number trimming threshold, then described user bears
Carrying the factor is 0；Otherwise, the described user load factor is 1；
When the current total flow of described radio reception device 10 is less than flow equalization threshold value, then the described flow load factor is
0；Otherwise, the described flow load factor is 1.
Described identifying unit 14, calculates the Q value of all described radio reception devices 10, by load-balancing algorithm
The big corresponding radio reception device of Q value 10 is the current radio reception device 102 allowing and accessing.
Further, the described signal strength signal intensity radio reception device the strongest 101 that accepts sends detection report to equipment to be accessed
Literary composition, comprises the information of the described radio reception device 102 allowing and accessing in message；
After described equipment to be accessed receives the described probe messages accepting signal strength signal intensity radio reception device the strongest 101,
The radio reception device 102 accessing to the described permission that described detection Bao Wenzhong specifies sends association request.
Further, described initialization unit 01, for setting maximum stream flow threshold value, maximum access quantity threshold value；
The current total flow of all described radio reception device 10 real-time monitorings itself, if described current total flow is more than
During big flow threshold value, then corresponding described radio reception device 10 is excluded in described load balancing group, is not involved in load all
Weighing apparatus, and do not allow to access new equipment described to be accessed；
All described radio reception device 10 real-time monitorings itself be currently accessed number, if the described number that is currently accessed is more than
During big access number threshold value, then corresponding described radio reception device 10 is excluded in described load balancing group, is not involved in loading
Equilibrium, and do not allow to access new equipment described to be accessed.
A kind of load-balancing method and SiteServer LBS that the present invention provides, beneficial effect：
Firstth, the main radio reception device in load balancing group periodically in inquiry group remaining radio reception device negative
Load equilibrium state, and generate the load-balancing information table of all radio reception devices in group, need not equipment acquisition to be accessed own
The load information of radio reception device, reduces equipment power dissipation to be accessed；
Secondth, equipment to be accessed goes to obtain Service Quality by load-balancing algorithm by RSSI radio reception device the strongest
Measure best radio reception device, improve the speed that equipment to be accessed obtains information, thus improve connecting the speed networking；
3rd, service quality coefficient is calculated by radio reception device, and the load-balancing information of radio reception device is not
Can leak to equipment to be accessed, enhance the security of wlan system.
4th, service quality coefficient, with RSSI, access number, total flow etc. as parameter, completely contains impact load balancing
Situation, and computing formula is simple.
It should be noted herein that although the foregoing describing the example embodiment of the present invention, but these descriptions are not
Should be understood in a limiting sense.On the contrary, can carry out several changing and modifications will without departing from such as appended right
The scope of the present invention defined in asking.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment above-mentioned here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore although being carried out to the present invention by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other Equivalent embodiments more can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (14)
1. a kind of load-balancing method, is applied to be made up of a wireless access control server and a plurality of radio reception device
Wlan system is it is characterised in that comprise the steps：
Step 1, described wireless access control server set up load balancing group, and described load balancing group at least includes 2 wirelessly
Access device, and specify radio reception device based on one of radio reception device；
Step 2, described main radio reception device send the request of query load situation to remaining radio reception device, according to response life
Become the load-balancing information table of described load balancing group, and to the broadcast of remaining radio reception device；
Step 3, remaining described radio reception device receive described load-balancing information table and store；
Step 4, described wireless access control server detect and accept signal strength signal intensity radio reception device the strongest in group；
By load-balancing algorithm, step 5, the described signal strength signal intensity radio reception device the strongest that accepts determine that current permission accesses
Described radio reception device.
2. as claimed in claim 1 a kind of load-balancing method it is characterised in that described step 2 specifically includes：
Step 20：The broadcast cycle of the main radio reception device of described wireless access control server settings；
Step 21：Described main radio reception device is pressed broadcast cycle and is periodically sent broadcasting packet to remaining radio reception device；
Step 22：Remaining described radio reception device, will be from after receiving the broadcasting packet that described main radio reception device sends
The loading condition of body replys described main radio reception device, and described loading condition includes being currently accessed number and current total flow；
Step 23：After described main radio reception device receives the described loading condition that remaining described radio reception device is replied,
Update the loading condition of itself, and generate the load-balancing information table of described load balancing group；
Step 24：Described main radio reception device broadcasts described load-balancing information table to radio reception device remaining described.
3. as claimed in claim 2 a kind of load-balancing method it is characterised in that specifically including in described step：
Step 40：The load threshold of arbitrary radio reception device in load balancing group described in described wireless access control server settings
Value, described load threshold includes accessing number trimming threshold and flow equalization threshold value；
Step 41：Whether completely described wireless access control server detection is described accepts signal strength signal intensity radio reception device the strongest
Sufficient load balancing；
Including detect described accept signal strength signal intensity radio reception device the strongest be currently accessed number and/or present flow rate whether little
In load balancing threshold value；
If being less than, permission access is described to accept signal strength signal intensity radio reception device the strongest；
Otherwise, go to step 5.
4. as claimed in claim 2 a kind of load-balancing method it is characterised in that in described step 5 load-balancing algorithm be Q
=kr*r+kf*(1-f)+ku* (1-u), wherein, Q is service quality coefficient, and Q value is bigger, and service quality is higher；
krFor accepting the design factor of signal strength signal intensity, kfFor total flow design factor, kuFor accessing number design factor, u bears for user
Carry the factor, f is the flow load factor.
5. as claimed in claim 4 a kind of load-balancing method it is characterised in that described step 5 comprises the steps：
Step 50：Described wireless access control server settings accept the design factor of signal strength signal intensity, total flow design factor, connect
Enter several design factors；
Step 51：The described described load-balancing information table accepting signal strength signal intensity radio reception device inquiry preservation the strongest, obtains
Take remaining described radio reception device accepts signal strength signal intensity, and calculates the user load factor and the flow load factor；
Wherein, when the number that is currently accessed of described radio reception device is less than access number trimming threshold, the then described user load factor
For 0；Otherwise, the described user load factor is 1；
When the current total flow of described radio reception device is less than flow equalization threshold value, then the described flow load factor is 0；No
Then, the described flow load factor is 1.
Step 52：Described accept signal strength signal intensity radio reception device the strongest calculated by load-balancing algorithm all described
The Q value of radio reception device；
Step 53：The described signal strength signal intensity radio reception device the strongest that accepts relatively draws maximum Q value, and determines corresponding institute
Stating radio reception device is the current radio reception device allowing and accessing.
6. a kind of load-balancing method as described in claim 1-5 is it is characterised in that also include after described step 5 walking as follows
Suddenly：
Step 60：The described signal strength signal intensity radio reception device the strongest that accepts sends probe messages to equipment to be accessed, in message
Comprise the information of the described radio reception device allowing and accessing；
Step 61：After described equipment to be accessed receives the described probe messages accepting signal strength signal intensity radio reception device the strongest,
The radio reception device accessing to the described permission that described detection Bao Wenzhong specifies sends association request.
7. as claimed in claim 6 a kind of load-balancing method it is characterised in that also including before step 1：
Step 00：Described wireless access control server settings maximum stream flow threshold value, described maximum access quantity threshold value；
Step 01：The current total flow of all described radio reception device real-time monitorings itself, if described current total flow is more than
During maximum stream flow threshold value, then corresponding described radio reception device is excluded in described load balancing group, is not involved in load all
Weighing apparatus, and do not allow to access new equipment described to be accessed；
Step 02：All described radio reception device real-time monitorings itself be currently accessed number, if described be currently accessed number be more than
During maximum access quantity threshold value, then corresponding described radio reception device is excluded in described load balancing group, is not involved in loading
Equilibrium, and do not allow to access new equipment described to be accessed.
8. a kind of SiteServer LBS, including a wireless access control server and a plurality of radio reception device, its feature exists
In：
Wireless access control server includes initialization unit, detector unit；
Described radio reception device includes radio unit, signal generating unit, memory cell, identifying unit；
Described initialization unit, for setting up the load balancing group at least including 2 radio reception devices, main wireless for specifying
Access device,
Described detector unit, accepts signal strength signal intensity radio reception device the strongest for detection；
Described radio unit, for broadcast query loading condition request simultaneously broadcast load equalization information table；
Described signal generating unit, generates the load-balancing information table of described load balancing group according to response；
Described memory cell, for storing the described load-balancing information table receiving；
Described identifying unit, for determining the current radio reception device allowing and accessing by load-balancing algorithm.
9. as claimed in claim 8 a kind of SiteServer LBS it is characterised in that：
Described initialization unit, for setting the broadcast cycle of main radio reception device；
Described radio unit, for periodically sending broadcasting packet to remaining radio reception device by broadcast cycle；
Remaining described radio reception device after receiving the broadcasting packet that described main radio reception device sends, by the load of itself
Situation replys described main radio reception device, and described loading condition includes being currently accessed number and current total flow；
After described main radio reception device receives the described loading condition that remaining described radio reception device is replied, update certainly
The loading condition of body；
The signal generating unit of described main radio reception device, generates the load-balancing information table of described load balancing group；
Described load-balancing information table is broadcasted and is set to wireless access remaining described by the radio unit of described main radio reception device
Standby.
10. as claimed in claim 9 a kind of SiteServer LBS it is characterised in that：
Described initialization unit, for setting the load threshold of arbitrary radio reception device in described load balancing group, described negative
Carry threshold value to include accessing number trimming threshold and flow equalization threshold value；
Described detector unit, described accepts whether signal strength signal intensity radio reception device the strongest meets load balancing for detecting；
Including detect described accept signal strength signal intensity radio reception device the strongest be currently accessed number and/or present flow rate whether little
In load balancing threshold value, if being less than, permission access is described to accept signal strength signal intensity radio reception device the strongest；Otherwise, described
Accept signal strength signal intensity radio reception device the strongest and the current described wireless access allowing and accessing is determined by load-balancing algorithm
Equipment.
11. as claimed in claim 10 a kind of SiteServer LBS it is characterised in that：
Described load-balancing algorithm is Q=kr*r+kf*(1-f)+ku* (1-u), wherein, Q is service quality coefficient, and Q value is bigger,
Service quality is higher；
krFor accepting the design factor of signal strength signal intensity, kfFor total flow design factor, kuFor accessing number design factor, u bears for user
Carry the factor, f is the flow load factor.
12. as claimed in claim 11 a kind of SiteServer LBS it is characterised in that：
Described initialization unit, for setting the design factor accepting signal strength signal intensity, total flow design factor, accessing number calculating system
Number；
The described described load-balancing information table accepting signal strength signal intensity radio reception device inquiry preservation the strongest, obtains remaining institute
That states radio reception device accepts signal strength signal intensity；
Described identifying unit, for calculating the user load factor and the flow load factor；
Wherein, when the number that is currently accessed of described radio reception device is less than access number trimming threshold, the then described user load factor
For 0；Otherwise, the described user load factor is 1；
When the current total flow of described radio reception device is less than flow equalization threshold value, then the described flow load factor is 0；No
Then, the described flow load factor is 1.
Described identifying unit, calculates the Q value of all described radio reception devices by load-balancing algorithm, and maximum Q value is right
The radio reception device answered is the current radio reception device allowing and accessing.
A kind of 13. SiteServer LBSs as described in claim 8-12 it is characterised in that：
The described signal strength signal intensity radio reception device the strongest that accepts sends probe messages to equipment to be accessed, comprises described in message
Allow the information of the radio reception device of access；
After described equipment to be accessed receives the described probe messages accepting signal strength signal intensity radio reception device the strongest, to described spy
The radio reception device surveying the described permission access that Bao Wenzhong specifies sends association request.
14. as claimed in claim 13 a kind of SiteServer LBS it is characterised in that：
Described initialization unit, for setting maximum stream flow threshold value, maximum access quantity threshold value；
The current total flow of all described radio reception device real-time monitorings itself, if described current total flow is more than maximum stream flow
During threshold value, then corresponding described radio reception device is excluded in described load balancing group, is not involved in load balancing, and does not permit
Permitted to access new equipment described to be accessed；
All described radio reception device real-time monitorings itself be currently accessed number, if the described number that is currently accessed accesses more than maximum
During number threshold value, then corresponding described radio reception device is excluded in described load balancing group, is not involved in load balancing, and not
Allow to access new equipment described to be accessed.
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