CN105578529B - A kind of selection system and method for access point - Google Patents
A kind of selection system and method for access point Download PDFInfo
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- 230000004044 response Effects 0.000 description 11
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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
- H04W48/16—Discovering, processing access restriction or access 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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Abstract
The present invention relates to a kind of access points to select system and method.The system includes: controller, resource manager, server, work station, multiple access points；Described access point is used to send the solicited message of work station to the server, and the solicited message includes signal strength information and user demand preference；The server is used to call resource manager to obtain network state information according to the solicited message of work station；The resource manager is used to call the northbound interface of the server to acquire the network state information；Under small scale network, the resource manager is used to obtain optimal access point according to the network state information and signal strength information combination user demand preference；Under large scale network, the network state information that the server is used to will acquire is sent to work station through access point, so that the work station obtains optimal access point.The present invention obtains network state information before accessing terminal to network, realizes the optimum choice that work station carries out access point according to Network status, keeps network load more balanced.
Description
Technical field
The present invention relates to wireless communication technology field more particularly to a kind of selection system and methods of access point.
Background technique
Software defined network (Software Defined Network, abbreviation SDN) (as shown in Figure 1) is a kind of novel
Transmission via net framework, based on OpenFlow technology by network central control plane and data planar separation, to realize in network
The flexible control of data flow has the characteristics that centralized network control and network can have external program programming.The typical architecture of SDN
Three layers are divided into, top layer is application layer, mainly includes the relevant business of network and management application；Middle layer is control layer, main
Have controller carry out flow table generation and under send the data forwarding of control network, while available network global view,
Safeguard network topology and status information；The bottom is data Layer, mainly by exchange mechanism at, the flow table issued according to controller into
Processing, forwarding and the information of row data are collected.
WLAN (Wireless Local Area Network, abbreviation WLAN) refers to wireless channel for transmission
The computer network of medium provides network insertion service at any time, everywhere for user.Wireless office based on IEEE802.11 standard
Domain net is widely used in society.In a wireless local area network, work station (Station, i.e. terminal, abbreviation STA) needs to access
When network, broadcast detection frame is sent, access point (Access Point, abbreviation AP) receives detection frame and carries out response reply, later
The signal strength indication of the available each AP of STA selects the AP compared with strong signal to be associated.In above process, STA is according only to letter
Number intensity value is selected, and channel disturbance situation and the loading condition of AP are had ignored, and may influence the communication performance of terminal and whole
The load balancing of a network.To find out its cause, be on the one hand that STA can not get the more network information before association, it is another
Aspect is that the distributed network architecture can not be collected into global status information, even if passing through access controller (Access
Controller, abbreviation AC) central controlled mode built network the problems such as there is also increase access delays.
802.11u is the Interoperability Protocol of the WLAN that IEEE802.11 working group defines and external network, which provide
General board service (Generic Advertisement Service, abbreviation GAS) allows STA being associated with advance with AP
The information exchange of the more data link layers of row.Access network inquiry agreement (Access Network Query Protocol,
Abbreviation ANQP) agreement of network information query function is provided based on GAS in standard, the request that STA is sent to AP can be by AP root
It is responded according to itself all information, can also be handled and be responded by being forwarded to corresponding ANQP Server.But
ANQP is mainly used for the internetwork roaming switch of different operators, can not provide better AP selection.Current existing some AP
It with the solution of network cooperating, or needs first to be associated with after an AP is inquired and switch over, increase associated time delay,
Or need to establish tunnel, more exploitation amount is needed, and support without standard.
Summary of the invention
The technical problems to be solved by the present invention are: existing terminal can not obtain detailed network with network before being associated with
Parameter causes access point to select unexcellent, the unbalanced problem of network load.
In order to solve the above technical problems, one aspect of the present invention proposes a kind of access point selection system, which includes:
Controller, resource manager, server, work station, multiple access points；
Described access point is used to send the solicited message of work station to the server, includes signal in the solicited message
Strength information；
The server is used to call resource manager to obtain network state information according to the solicited message of work station；
The resource manager is used to call the northbound interface of the server to acquire the network state information；
Under small scale network, the resource manager be used for according to the network state information and signal strength information and
User demand preference obtains optimal access point；
Under large scale network, the network state information that the server is used to will acquire is sent to work through access point
It stands, so that the work station obtains optimal access point；
Wherein, the network state information includes load demand number, channel utilization, retransmission rate and the access point of access point
The bottleneck bandwidth exported to local area network；
The user demand preference is the sequence to the property value set of access point selection basis, described to select access point
According to property value set include: received signal strength indication value, the load demand number of access point, channel utilization, retransmission rate
The bottleneck bandwidth exported with access point to local area network.
Optionally, the server is specifically used for calling the API of resource manager to inquire according to the solicited message of work station
Agreement obtains network state information.
Optionally, the resource manager is also used to when the network state information changes, by the net after variation
Network status information is sent to access point by the API of invoking server.
Optionally, described access point is also used to, the network state information after the variation for receiving resource manager transmission
Later, the network state information after the variation is forwarded to work station.
Optionally, at least one interchanger is additionally provided between described access point and controller.
Another aspect of the present invention proposes a kind of access point selection method, this method comprises:
Before work station association access point, the signal strength of multiple access points is obtained, by the maximum access of signal strength
Point is determined as inquiring access point；
After server receives the workstation requests information of the inquiry access point forwarding, resource manager is called to obtain net
Network status information, the solicited message include signal strength information and user demand preference；
Under small scale network, resource manager is according to the network state information and signal strength information combination user's need
Preference is asked to obtain optimal access point；
Under large scale network, the network state information that the server will acquire is sent to work through the inquiry access point
It stands, so that the work station obtains optimal access point；
The work station is associated with the optimal access point；
Wherein, the network state information includes load demand number, channel utilization, retransmission rate and the access point of access point
The bottleneck bandwidth exported to local area network；
The user demand preference is the sequence to the property value set of access point selection basis, described to select access point
According to property value set include: received signal strength indication value, the load demand number of access point, channel utilization, retransmission rate
The bottleneck bandwidth exported with access point to local area network.
Optionally, the resource manager is according to the network state information and signal strength information and user demand preference
Obtain optimal access point, comprising:
The resource manager is used according to the network state information and signal strength information combination user demand preference
Analytic hierarchy process (AHP) constructs five scales or nine scale fuzzy matrixes, the score of each access point is obtained, by the access point of highest scoring
It is determined as optimal access point.
Optionally, the server calls resource manager obtains network state information, comprising:
The API vlan query protocol VLAN of the server calls resource manager obtains network state information.
Optionally, this method further include:
When the network state information changes, the resource manager passes through the network state information after variation
The API of the server is called to be sent to access point.
Optionally, this method further include:
Described access point is after the network state information after the variation for receiving resource manager transmission, by the variation
Network state information afterwards is forwarded to work station.
Access point provided by the invention selects system and method, before accessing terminal to network, obtains network state information,
The optimum choice that work station carries out access point according to Network status is realized, access point selection is more effectively carried out, keeps network negative
Load is more balanced, improves terminal communication performance.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 shows the structural schematic diagram of the access point selection system of one embodiment of the invention；
Fig. 2 shows the schematic diagrames of the Beacon frame of one embodiment of the invention；
Fig. 3 shows the schematic diagram of the claim frame of one embodiment of the invention；
Fig. 4 shows the schematic diagram of the response frame of one embodiment of the invention；
Fig. 5 shows the flow chart of the access point selection method of one embodiment of the invention；
Fig. 6 shows the signaling process figure of the access point selection method of one embodiment of the invention.
Specific embodiment
Below in conjunction with attached drawing, embodiments of the present invention is described in detail.
Fig. 1 shows the structural schematic diagram of the access point selection system of one embodiment of the invention.As shown in Figure 1, the reality
Apply the access point selection system of example, comprising:
Controller 1, resource manager 2, server (Server) 3, work station (STA) 4, multiple access points (AP) 5；
Access point 5 is used to send the solicited message of work station 4 to server 3, and the solicited message includes signal strength letter
Breath and user demand preference；
Server 3 is used to call resource manager 2 to obtain network state information according to the solicited message of work station 4；
Northbound interface of the resource manager 2 for invoking server 3 acquires the network state information；
Under small scale network, resource manager 2 is used for according to the network state information and signal strength information and use
Family Demand perference obtains optimal access point；
Under large scale network, the network state information that server 3 is used to will acquire is sent to work station 4 through access point 5,
So that the work station obtains optimal access point；
Wherein, the network state information includes load demand number, channel utilization, retransmission rate and the access point of access point
The bottleneck bandwidth exported to local area network；
The user demand preference is the sequence to the property value set of access point selection basis, described to select access point
According to property value set include: received signal strength indication value, the load demand number of access point, channel utilization, retransmission rate
The bottleneck bandwidth exported with access point to local area network.
It should be noted that the access point of the present embodiment supports 802.11u, controlled by controller；Controller can be
The SDN controller of profession or the server for running OpenFlow software；The acquisition of network state information is using periodically acquisition
Mode.
The access point of the present embodiment selects system, before accessing terminal to network, obtains network state information, realizes work
It stands and carries out the optimum choice of access point according to Network status, be more effectively carried out access point selection, keep network load more balanced,
Improve terminal communication performance.
In a kind of optional embodiment, the server is specifically used for calling resource according to the solicited message of work station
The API vlan query protocol VLAN of manager obtains network state information.Access point selects system mutual by server and resource manager
The mode for providing RESTful api makes two independent structures realize organic combination.
The resource manager is also used to when the network state information changes, and the network state after variation is believed
Breath is sent to access point by the API of invoking server.
Resource manager can pass through the API of invoking server when network state changes or STA is moved
STA is informed, some movements are carried out.
Described access point is also used to, will after the network state information after the variation for receiving resource manager transmission
Network state information after the variation is forwarded to work station.
At least one interchanger is additionally provided between described access point and controller.It should actually use, which is
Support the SDN switch of OpenFlow.
The access point selection system of the present embodiment is the system design scheme that 802.11u is combined in SDN wireless network, real
Show network and terminal synergistic mechanism, provides STA active inquiry and the ability passively informed in the case where not associated AP.
It should be noted that the access point selection system of the embodiment is inquired using the Internet resources designed based on GAS
What agreement (Network Resource Query Protocol) was realized.The NRQP is to solve existing ANQP agreement master
It is used for the internetwork roaming switch of different operators, better AP selection can not be provided and the agreement of redesign.Below from
Three extension of Beacon frame, the design of claim frame and the design of response frame parts illustrate NRQP agreement.
(1) Fig. 2 shows the schematic diagrames of the Beacon frame of one embodiment of the invention.As shown in Fig. 2, the first row is
The field that 802.11u newly extends in Beacon frame can be taken in Radio Broadcasting Agreements (Advertisement protocol) field
The GAS agreement supported with network.The data format of second row and third behavior Radio Broadcasting Agreements field, protocol number
(Advertisement Protocol ID) has 8 bit altogether, can support 0~255 totally 255 agreements, be mostly in guarantor
Stay state.The protocol number that the present invention chooses two reservations respectively indicates the NRQP of network decision and network inquiry mode.Network pipe
Reason person, using network inquiry mode, can subtract under large scale network according to the configuration that network size carries out different mode NRQP
Light server stress；Under small scale network, using network decision mode, the movement that guiding via network terminal will be carried out, into
Row quickly reaction.The NRQP mode supported that STA can be broadcast out by AP makes requests.
(2) Fig. 3 shows the schematic diagram of the claim frame of one embodiment of the invention.As shown in figure 3, in figure shown in the first row
Frame data format is requested for GAS, Advertisement Protocol Element contains protocol number, invention defines
The corresponding inquiry request of NRQP (Query Request) field.The data format of second behavior request field in figure, it includes with
Family Demand perference (User Satisfy) and inquiry AP list (Query AP List) two fields.Third behavior list in figure
The data format of each single item, the SSID (Service Set Identifier, service set) including capableing of unique identification AP
With BSSID (Basic Service Set Identifier, basic service set identification), there are also one under network decision mode
RSSI (Received Signal Strength Indication, the received letter for the access point that the STA that need to be carried is listened to
The instruction of number intensity) value, it is emptied under network inquiry mode.
Advertisement Protocol Element is the corresponding protocol number of request in GAS claim frame, STA according to
The NRQP protocol number scanned is configured.Invention defines the corresponding inquiry request (Query of NRQP
Request) field mainly includes user demand preference (User Satisfy) and inquiry AP list (Query AP List) two
A field.User demand preference is the sequence to the property value set of AP selection basis, the property value set packet that the present invention uses
It includes: (1) retransmission rate (5) of channel utilization (4) AP of load number (3) AP for access point RSSI value (2) AP that STA is listened to
The bottleneck bandwidth that AP is exported to local area network.These attributes can reflect out the working condition of AP substantially, can be used as STA and is selected
The basic parameter selected.Inquiry AP list refers to that the network that STA can be listened to meets the AP set of certain RSSI threshold value, each
The information of AP is as one in list.In AP list the data format of each single item include be capable of unique identification AP SSID and
BSSID, the RSSI value for the access point for needing the STA carried to listen under network decision mode there are also one, in network inquiry mould
It is emptied under formula.
(3) Fig. 4 shows the schematic diagram of the response frame of one embodiment of the invention.As shown in figure 4, in figure shown in the first row
Frame data format is responded for GAS.Advertisement Protocol Element is the association of corresponding requests in GAS response frame number
View number, NRQP server carry out identical setting according to claim frame.Invention defines NRQP pairs under two kinds of different modes
Inquiry response (Query Response) field answered.Under network decision mode, the data format of inquiry response field is mainly wrapped
Include two fields: target AP (Target AP) is on the information returned by NRQP server according to resource manager and STA
What the user demand preference of biography was calculated comprising be capable of the SSID and BSSID of unique identification AP；Act (Action) field
It is to be obtained by user's current state by server decision, including certification, association and switching etc..Under network inquiry mode, inquiry
The data format of response field includes a field: response AP list (Respond AP List), is corresponded in STA request
Inquiry AP list all inquire obtained information, the information of inquiry includes AP load demand number (User number), channel
The bottleneck bandwidth that utilization rate (Channel utilization), retransmission rate (Retry Count) and AP are exported to local area network
(Bottleneck bandwidth)。
Fig. 5 shows the flow chart of the access point selection method of one embodiment of the invention, and the access of the embodiment clicks
Selection method selects system based on above-mentioned access point, and NRQP agreement above-mentioned is utilized.As shown in figure 5, the embodiment
Access point selection method, comprising:
S51: before work station association access point, obtaining the signal strength of multiple access points, and signal strength is maximum
Access point is determined as inquiring access point；
S52: after server receives the workstation requests information of the inquiry access point forwarding, resource manager is called to obtain
Network state information is taken, the solicited message includes signal strength information and user demand preference；
S53: under small scale network, resource manager is combined according to the network state information and signal strength information and is used
Family Demand perference obtains optimal access point；Under large scale network, described in the network state information warp that the server will acquire
Inquiry access point is sent to work station, so that the work station obtains optimal access point；
S54: the work station is associated with the optimal access point；
Wherein, the network state information includes load demand number, channel utilization, retransmission rate and the access point of access point
The bottleneck bandwidth exported to local area network；
The user demand preference is the sequence to the property value set of access point selection basis, described to select access point
According to property value set include: received signal strength indication value, the load demand number of access point, channel utilization, retransmission rate
The bottleneck bandwidth exported with access point to local area network.
Access point selection method provided in this embodiment obtains network state information before accessing terminal to network, realizes
Work station carries out the optimum choice of access point according to Network status, is more effectively carried out access point selection, makes network load more
Equilibrium improves terminal communication performance.
In a kind of optional embodiment, the resource manager is believed according to the network state information and signal strength
Breath combines user demand preference to obtain optimal access point, comprising:
The resource manager is used according to the network state information and signal strength information combination user demand preference
Analytic hierarchy process (AHP) constructs five scales or nine scale fuzzy matrixes, the score of each access point is obtained, by the access point of highest scoring
It is determined as optimal access point.
Specifically, the server calls resource manager obtains network state information, comprising:
The API vlan query protocol VLAN of the server calls resource manager obtains network state information.
In order to realize after STA association, netter can notify STA to carry out some movements with this A Yong communication link, realize
The optimization of overall performance, this method further include:
When the network state information changes, the resource manager passes through the network state information after variation
The API of the server is called to be sent to access point.
Further, this method further include:
Described access point is after the network state information after the variation for receiving resource manager transmission, by the variation
Network state information afterwards is forwarded to work station.
Fig. 6 shows the signaling process figure of the access point selection method of one embodiment of the invention.Illustrate below in conjunction with Fig. 6
The specific implementation process of one embodiment of the invention:
Step 1, STA scans the Beacon frame of all AP broadcast in current network, its NRQP mode supported is checked, by it
The optimal AP of middle signal strength initiates GAS to AP and asks as inquiry AP according to user demand configuration and network support agreement situation
It asks.
Step 2, after AP receives the request of STA, according to the protocol number in request, NRQP server is forwarded it to.
Step 3, after NRQP server receives the request that AP forwarding comes, the API of resource manager, generally HTTP is called to ask
It asks, inquires attribute data every in AP list to be checked (involved in Fig. 3 four).
Step 4, resource manager obtains these data by controller by the way of periodically acquiring.Wherein AP
Number of users, channel utilization and retransmission rate can be according to Simple Network Management Protocol (Simple Network Management
Protocol, abbreviation SNMP) it is read from AP, and saved and safeguarded.When inquiry API is called, resource manager meeting
Last 3 times sampled value < C of each attribute of each AP are inquired according to request3, C2, C1>, wherein C1It is newest sampled value,
Numerical value C in response is calculated according to following formular=0.2*C3+0.3*C2+0.5*C1, both considered so current
AP load, also to keep attribute value more representative with reference to account of the history.
Step 5, NRQP server is different according to the mode of setting, oneself is according to return value and user's need under decision-making mode
It asks preference to be calculated, and the decision information that result is obtained is sent to STA, under query pattern, directly forwards return value
Calculating and decision are carried out to STA.Calculating process uses analytic hierarchy process (AHP), according to user demand preference, carries out nine and indexes fuzzy square
The construction of battle array, the first row indicate that the highest attribute that sorts, matrix are as follows:
Can calculate its maximum eigenvalue be 5.2375, corresponding feature vector as weight vectors for [0.863,
0.4401,0.217,0.1067,0.0561]TAnd consistency checking is carried out to it, coincident indicator CI=is calculated
0.0594, same order random index RI=1.12, random consistency ratio CR=0.053 < 0.1 illustrate gained weighted value
With satisfactory consistency.According to this weighted value, the comprehensive score that the attribute after normalization carries out AP is calculated and sorted, can be obtained
To target AP.
Step 6, STA is associated or switch etc. and act according to being calculated as a result, determine target AP.
Step 7, when network state changes or STA is moved, such as, current AP load becomes weight, useful
Family carries out mass data transmission, and resource manager can initiate new looks by the interface of calling NRQP server, notice STA
It askes, reselects AP.
Access point provided by the invention selects system and method, before accessing terminal to network, obtains network state information,
The optimum choice that work station carries out access point according to Network status is realized, access point selection is more effectively carried out, keeps network negative
Load is more balanced, improves terminal communication performance.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations are made in the case where bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (9)
1. a kind of access point selects system characterized by comprising controller, resource manager, server, work station, multiple
Access point；
Described access point is used to send the solicited message of work station to the server, includes signal strength in the solicited message
Information and user demand preference；
The server is used to call resource manager to obtain network state information according to the solicited message of work station；
The resource manager is used to call the northbound interface of the server to acquire the network state information；
Under small scale network, the resource manager is used to be combined according to the network state information and signal strength information and use
Family Demand perference constructs five scales or nine scale fuzzy matrixes using analytic hierarchy process (AHP), obtains the score of each access point, will
Highest access point is divided to be determined as optimal access point；
Under large scale network, the network state information that the server is used to will acquire is sent to work station through access point, with
The work station is set to obtain optimal access point；
Wherein, the network state information includes load demand number, channel utilization, retransmission rate and the access point of access point to office
The bottleneck bandwidth of domain net outlet；
The user demand preference is the sequence to the property value set of access point selection basis, described to select basis to access point
Property value set include: received signal strength indication value, the load demand number of access point, channel utilization, retransmission rate and connect
The bottleneck bandwidth that access point is exported to local area network.
2. access point according to claim 1 selects system, which is characterized in that the server is specifically used for according to work
The solicited message stood calls the API vlan query protocol VLAN of resource manager to obtain network state information.
3. access point according to claim 1 selects system, which is characterized in that the resource manager is also used to when described
When network state information changes, the network state information after variation is sent to access point by the API of invoking server.
4. access point according to claim 3 selects system, which is characterized in that described access point is also used to, and is being received
After network state information after the variation that resource manager is sent, the network state information after the variation is forwarded to work
It stands.
5. access point according to claim 1 selects system, which is characterized in that between described access point and controller also
Equipped at least one interchanger.
6. a kind of access point selection method characterized by comprising
Before work station association access point, the signal strength of multiple access points is obtained, the maximum access point of signal strength is true
It is set to inquiry access point；
After server receives the workstation requests information of the inquiry access point forwarding, resource manager is called to obtain network-like
State information, the solicited message include signal strength information and user demand preference；
Under small scale network, resource manager is inclined according to the network state information and signal strength information combination user demand
Optimal access point is obtained well；
Under large scale network, the network state information that the server will acquire is sent to work through the inquiry access point
It stands, so that the work station obtains optimal access point；
The work station is associated with the optimal access point；
Wherein, the network state information includes load demand number, channel utilization, retransmission rate and the access point of access point to office
The bottleneck bandwidth of domain net outlet；
The user demand preference is the sequence to the property value set of access point selection basis, described to select basis to access point
Property value set include: received signal strength indication value, the load demand number of access point, channel utilization, retransmission rate and connect
The bottleneck bandwidth that access point is exported to local area network；
Wherein, the resource manager is obtained according to the network state information and signal strength information combination user demand preference
Optimal access point, comprising:
The resource manager uses level according to the network state information and signal strength information combination user demand preference
Analytic approach constructs five scales or nine scale fuzzy matrixes, obtains the score of each access point, and the access point of highest scoring is determined
For optimal access point.
7. access point selection method according to claim 6, which is characterized in that the server calls resource manager obtains
Take network state information, comprising:
The API vlan query protocol VLAN of the server calls resource manager obtains network state information.
8. access point selection method according to claim 6, which is characterized in that further include:
When the network state information changes, the network state information after variation is passed through calling by the resource manager
The API of the server is sent to access point.
9. access point selection method according to claim 8, which is characterized in that further include:
Described access point is after the network state information after the variation for receiving resource manager transmission, after the variation
Network state information is forwarded to work station.
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