CN105578529A - Access point selection system and method - Google Patents
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- CN105578529A CN105578529A CN201610132704.3A CN201610132704A CN105578529A CN 105578529 A CN105578529 A CN 105578529A CN 201610132704 A CN201610132704 A CN 201610132704A CN 105578529 A CN105578529 A CN 105578529A
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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
Abstract
The invention relates to an access point selection system and method. The system comprises a controller, a resource manager, a server, a workstation and multiple access points; the access point is used for sending request information of the workstation to the server, and the request information comprises signal strength information and user demand preference; the server is used for scheduling the resource manager according to the request information of the workstation to obtain network state information; the resource manager is used for scheduling a northern interface of the server to collect the network state information; in a small scale network, the resource manager is used for obtaining an optimal access point according to the network state information and the signal strength information, in combination with the user demand preference; and in a large scale network, the server is used for sending the obtained network state information to the workstation through the access point, thus allowing the workstation to obtain the optimal access point. According to the access point selection system provided by the invention, before accessing the network, the terminal obtains the network state information, the workstation selects the optimal access point according to the network condition, and the network load is more balanced.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of selective system and method for access point.
Background technology
Software defined network (SoftwareDefinedNetwork, be called for short SDN) (as shown in Figure 1) be a kind of novel transmission via net framework, based on OpenFlow technology, network central control plane is separated with datum plane, thus achieve the flexible control of data flow in network, have centralized network control and network can have the features such as external program programming.The typical architecture of SDN is divided into three layers, and the superiors are application layer, mainly comprises the relevant business of network and management application; Intermediate layer is key-course, mainly contain controller carry out stream table generation and under send the data retransmission of net control, network global view can be obtained, maintaining network topological sum state information simultaneously; The bottom is data Layer, forms primarily of switch, and the stream table issued according to controller carries out the process of data, forwarding and information.
WLAN (wireless local area network) (WirelessLocalAreaNetwork, be called for short WLAN) refers to wireless channel to be the computer network of transmission medium, for user provides the service of network insertion at any time, everywhere.WLAN (wireless local area network) based on IEEE802.11 standard is widely used in society.In a wireless local area network, work station (Station, i.e. terminal, be called for short STA) when needing access network, send broadcast probe frame, access point (AccessPoint is called for short AP) receives explore frame and carries out response reply, STA can obtain the signal strength values of each AP afterwards, selects the AP of stronger signal to associate.In above process, STA only selects according to signal strength values, have ignored the loading condition of channel disturbance situation and AP, may affect the communication performance of terminal and the load balancing of whole network.Trace it to its cause, that STA cannot get the more network information before association on the one hand, the state information that the distributed network architecture cannot collect the overall situation on the other hand, even if also there is by access controller (AccessController is called for short AC) central controlled mode built network problems such as increasing access delay.
802.11u is the WLAN of IEEE802.11 working group definition and the Interoperability Protocol of external network, which provide general board service (GenericAdvertisementService, be called for short GAS), make STA with AP can carry out the information exchange of more data link layer before associating.Access network vlan query protocol VLAN (AccessNetworkQueryProtocol, be called for short ANQP) agreement of NSLOOKUP function is provided based on GAS in standard, the request that STA sends to AP can be responded according to self all information by AP, also can be undertaken processing by being forwarded to corresponding ANQPServer and responding.But ANQP is mainly used in the internetwork roaming switch of different operators, better AP cannot be provided to select.The solution of current more existing AP and network cooperating, or needing first to associate after an AP inquires about switches, and increases the time delay of association, or needs to set up tunnel, need more exploitation amount, and do not have standard support.
Summary of the invention
Technical problem to be solved by this invention is: existing terminal and network cannot obtain detailed network parameter and cause access point to select unexcellent, the unbalanced problem of offered load before associating.
For solving the problems of the technologies described above, one aspect of the present invention proposes a kind of access point selective system, and this system comprises:
Controller, explorer, server, work station, multiple access point;
Described access point is for sending the solicited message of work station to described server, and described request information comprises signal strength information;
Described server is used for calling explorer according to the solicited message of work station and obtains network state information;
Described explorer gathers described network state information for the northbound interface calling described server;
Under small scale network, described explorer is used for obtaining optimum access point according to described network state information and signal strength information and user's request preference;
Under large scale network, described server is used for the network state information of acquisition to be sent to work station through access point, obtains optimum access point to make described work station;
Wherein, described network state information comprises the bottleneck bandwidth that the load demand number of access point, channel utilization, retransmission rate and access point export to local area network (LAN);
Described user's request preference be to access point selection according to the sequence of property value set, described to access point selection according to property value set comprise: the bottleneck bandwidth that the load demand number of received signal strength indicator value, access point, channel utilization, retransmission rate and access point export to local area network (LAN).
Alternatively, described server obtains network state information specifically for the API vlan query protocol VLAN calling explorer according to the solicited message of work station.
Alternatively, the network state information after change, also for when described network state information changes, is sent to access point by the API of invoking server by described explorer.
Alternatively, described access point also for, receive explorer send change after network state information after, the network state information after described change is forwarded to work station.
Alternatively, between described access point and controller, at least one switch is also provided with.
The present invention proposes a kind of access point system of selection on the other hand, and the method comprises:
Before work station association access point, obtain the signal strength signal intensity of multiple access point, access point maximum for signal strength signal intensity is defined as inquire about access point;
After server receives the workstation requests information of described inquiry access point forwarding, call explorer and obtain network state information, described request information comprises signal strength information and user's request preference;
Under small scale network, explorer obtains optimum access point according to described network state information and signal strength information in conjunction with user's request preference;
Under large scale network, the network state information of acquisition is sent to work station through described inquiry access point by described server, obtains optimum access point to make described work station;
The described optimum access point of described work station association;
Wherein, described network state information comprises the bottleneck bandwidth that the load demand number of access point, channel utilization, retransmission rate and access point export to local area network (LAN);
Described user's request preference be to access point selection according to the sequence of property value set, described to access point selection according to property value set comprise: the bottleneck bandwidth that the load demand number of received signal strength indicator value, access point, channel utilization, retransmission rate and access point export to local area network (LAN).
Alternatively, described explorer obtains optimum access point according to described network state information and signal strength information and user's request preference, comprising:
Described explorer adopts analytic hierarchy process (AHP) to construct five scales or nine scale fuzzy matrixes according to described network state information and signal strength information in conjunction with user's request preference, obtain the score of each access point, access point the highest for score is defined as optimum access point.
Alternatively, described server calls explorer obtains network state information, comprising:
The API vlan query protocol VLAN of described server calls explorer obtains network state information.
Alternatively, the method also comprises:
When described network state information changes, the network state information after change is sent to access point by the API calling described server by described explorer.
Alternatively, the method also comprises:
After the network state information of described access point after the change receiving explorer transmission, the network state information after described change is forwarded to work station.
Access point selective system provided by the invention and method, before accessing terminal to network, obtain network state information, achieve work station carries out access point optimum choice according to network condition, more effectively carry out access point selection, make offered load more balanced, improve terminal communication performance.
Accompanying drawing explanation
Can understanding the features and advantages of the present invention clearly by reference to accompanying drawing, accompanying drawing is schematic and should not be construed as and carry out any restriction to the present invention, in the accompanying drawings:
Fig. 1 shows the structural representation of the access point selective system of one embodiment of the invention;
Fig. 2 shows the schematic diagram 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 system of selection of one embodiment of the invention;
Fig. 6 shows the signaling process figure of the access point system of selection of one embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
Fig. 1 shows the structural representation of the access point selective system of one embodiment of the invention.As shown in Figure 1, the access point selective system of this embodiment, comprising:
Controller 1, explorer 2, server (Server) 3, work station (STA) 4, multiple access point (AP) 5;
Access point 5 is for sending the solicited message of work station 4 to server 3, and described request information comprises signal strength information and user's request preference;
Server 3 obtains network state information for calling explorer 2 according to the solicited message of work station 4;
Explorer 2 gathers described network state information for the northbound interface of invoking server 3;
Under small scale network, explorer 2 is for obtaining optimum access point according to described network state information and signal strength information and user's request preference;
Under large scale network, server 3, for the network state information of acquisition is sent to work station 4 through access point 5, obtains optimum access point to make described work station;
Wherein, described network state information comprises the bottleneck bandwidth that the load demand number of access point, channel utilization, retransmission rate and access point export to local area network (LAN);
Described user's request preference be to access point selection according to the sequence of property value set, described to access point selection according to property value set comprise: the bottleneck bandwidth that the load demand number of received signal strength indicator value, access point, channel utilization, retransmission rate and access point export to local area network (LAN).
It should be noted that, the access point of the present embodiment supports 802.11u, is controlled by controller; Controller can be the SDN controller of specialty or runs the server of OpenFlow software; The collection of network state information adopts the mode periodically gathered.
The access point selective system of the present embodiment, before accessing terminal to network, obtains network state information, achieve work station carries out access point optimum choice according to network condition, more effectively carry out access point selection, make offered load more balanced, improve terminal communication performance.
In the optional execution mode of one, described server obtains network state information specifically for the API vlan query protocol VLAN calling explorer according to the solicited message of work station.Access point selective system by server and explorer provide mutually the mode of RESTfulapi make two independently structure achieve organic combination.
Network state information after change, also for when described network state information changes, is sent to access point by the API of invoking server by described explorer.
Explorer can work as network state change or STA moves time, by the API of invoking server, STA is informed, carries out some actions.
Described access point also for, receive explorer send change after network state information after, the network state information after described change is forwarded to work station.
At least one switch is also provided with between described access point and controller.Should use actual, this switch is the SDN switch supporting OpenFlow.
The access point selective system of the present embodiment is the system design scheme in conjunction with 802.11u in SDN wireless network, achieves network and terminal synergistic mechanism, provides STA active inquiry and passive ability of informing when not associated AP.
It should be noted that, the access point selective system of this embodiment utilizes the Internet resources vlan query protocol VLAN (NetworkResourceQueryProtocol) based on GAS design to realize.This NRQP is mainly used in the internetwork roaming switch of different operators to solve existing ANQP agreement, better AP cannot be provided to select and the agreement of redesign.From the design of the expansion of Beacon frame, claim frame and design three part of response frame, NRQP agreement is described below.
(1) Fig. 2 shows the schematic diagram of the Beacon frame of one embodiment of the invention.As shown in Figure 2, the first row is the field of 802.11u new expansion in Beacon frame, in Radio Broadcasting Agreements (Advertisementprotocol) field, can carry the GAS agreement that network is supported.Second row and the third line are the data format of Radio Broadcasting Agreements field, protocol number (AdvertisementProtocolID) altogether 8 bit, and can support 0 ~ 255 totally 255 agreements, major part is in reserved state.The present invention chooses the NRQP that two protocol numbers retained represent network decision and network inquiry pattern respectively.Network manager can carry out the configuration of different mode NRQP according to network size, under large scale network, adopt network inquiry pattern, alleviate server stress; Under small scale network, adopt network decision pattern, allow guiding via network terminal be about to the action carried out, react fast.The NRQP pattern supported that STA can be broadcast out by AP is asked.
(2) Fig. 3 shows the schematic diagram of the claim frame of one embodiment of the invention.As shown in Figure 3, in figure, the first row is depicted as GAS claim frame data format, and AdvertisementProtocolElement contains protocol number, invention defines inquiry request corresponding to NRQP (QueryRequest) field.The data format of the second behavior request field in figure, it comprises user's request preference (UserSatisfy) and inquiry AP list (QueryAPList) two fields.In figure, the third line is each data format of list, comprising can the SSID (ServiceSetIdentifier of unique identification AP, service set) and BSSID (BasicServiceSetIdentifier, basic service set identification), also has the RSSI (ReceivedSignalStrengthIndication of an access point needing the STA carried to listen under network decision pattern, the signal strength signal intensity instruction received) value, at the underlying sky of network inquiry pattern.
In GAS claim frame, AdvertisementProtocolElement is the protocol number of request correspondence, and STA carries out arranging according to the NRQP protocol number scanned.Invention defines inquiry request corresponding to NRQP (QueryRequest) field, mainly comprise user's request preference (UserSatisfy) and inquiry AP list (QueryAPList) two fields.User's request preference AP is selected to the sequence of property value set of basis, and the property value set that the present invention adopts comprises: the bottleneck bandwidth that retransmission rate (5) AP of channel utilization (4) AP of load number (3) AP of access point RSSI value (2) AP that (1) STA listens to exports to local area network (LAN).These attributes can reflect the working condition of AP substantially, can carry out the basic parameter selected as STA.Inquiry AP list refers to the AP set of the certain RSSI threshold value of this network conforms that STA can listen to, and the information of each AP is as in list.In AP list, comprise can SSID and BSSID of unique identification AP for the data format of each, also has the RSSI value of an access point needing the STA carried to listen under network decision pattern, at the underlying sky of network inquiry pattern.
(3) Fig. 4 shows the schematic diagram of the response frame of one embodiment of the invention.As shown in Figure 4, in figure, the first row is depicted as GAS response frame data format.It is the protocol number of corresponding requests that GAS responds AdvertisementProtocolElement in frame number, and NRQP server carries out identical setting according to claim frame.Invention defines inquiry response (QueryResponse) field that NRQP under two kinds of different modes is corresponding.Under network decision pattern, the data format of inquiry response field mainly comprises two fields: target AP (TargetAP) is the information returned according to explorer by NRQP server, and the STA user's request preference uploaded calculates, it comprises can SSID and BSSID of unique identification AP; Action (Action) field is obtained by server decision-making by user's current state, comprises certification, association and switching etc.Under network inquiry pattern, the data format of inquiry response field comprises a field: response AP list (RespondAPList), be that all items of inquiry AP list corresponded in STA request inquire about the information obtained, the information of inquiry comprises the bottleneck bandwidth (Bottleneckbandwidth) that AP load demand number (Usernumber), channel utilization (Channelutilization), retransmission rate (RetryCount) and AP export to local area network (LAN).
Fig. 5 shows the flow chart of the access point system of selection of one embodiment of the invention, and the access point system of selection of this embodiment based on above-mentioned access point selective system, and make use of aforesaid NRQP agreement.As shown in Figure 5, the access point system of selection of this embodiment, comprising:
S51: before work station association access point, obtains the signal strength signal intensity of multiple access point, is defined as by access point maximum for signal strength signal intensity inquiring about access point;
S52: after server receives the workstation requests information of described inquiry access point forwarding, call explorer and obtain network state information, described request information comprises signal strength information and user's request preference;
S53: under small scale network, explorer obtains optimum access point according to described network state information and signal strength information in conjunction with user's request preference; Under large scale network, the network state information of acquisition is sent to work station through described inquiry access point by described server, obtains optimum access point to make described work station;
S54: the described optimum access point of described work station association;
Wherein, described network state information comprises the bottleneck bandwidth that the load demand number of access point, channel utilization, retransmission rate and access point export to local area network (LAN);
Described user's request preference be to access point selection according to the sequence of property value set, described to access point selection according to property value set comprise: the bottleneck bandwidth that the load demand number of received signal strength indicator value, access point, channel utilization, retransmission rate and access point export to local area network (LAN).
The access point system of selection that the present embodiment provides, before accessing terminal to network, obtains network state information, achieve work station carries out access point optimum choice according to network condition, more effectively carry out access point selection, make offered load more balanced, improve terminal communication performance.
In the optional execution mode of one, described explorer obtains optimum access point according to described network state information and signal strength information in conjunction with user's request preference, comprising:
Described explorer adopts analytic hierarchy process (AHP) to construct five scales or nine scale fuzzy matrixes according to described network state information and signal strength information in conjunction with user's request preference, obtain the score of each access point, access point the highest for score is defined as optimum access point.
Particularly, described server calls explorer obtains network state information, comprising:
The API vlan query protocol VLAN of described server calls explorer obtains network state information.
In order to realize after STA association, netter can carry out some actions by this A Yong communication link notice STA, and realize the optimization of overall performance, the method also comprises:
When described network state information changes, the network state information after change is sent to access point by the API calling described server by described explorer.
Further, the method also comprises:
After the network state information of described access point after the change receiving explorer transmission, the network state information after described change is forwarded to work station.
Fig. 6 shows the signaling process figure of the access point system of selection of one embodiment of the invention.The concrete implementing procedure of one embodiment of the invention is described below in conjunction with Fig. 6:
Step 1, STA scans the Beacon frame of all AP broadcast in current network, checks its NRQP pattern supported, using the AP of wherein signal strength signal intensity optimum as inquiry AP, according to user's request configuration and network support agreement situation, initiates GAS ask to AP.
Step 2, after AP receives the request of STA, according to the protocol number in request, is transmitted to NRQP server.
Step 3, NRQP server calls the API of explorer, is generally HTTP request, inquire about attribute data (four that relate in Fig. 3) every in AP list to be checked after receiving the next request of AP forwarding.
Step 4, explorer adopts the mode periodically gathered, and obtains these data by controller.Wherein the number of users of AP, channel utilization and retransmission rate all can according to Simple Network Management Protocol (SimpleNetworkManagementProtocol is called for short SNMP) from AP reading, and be carried out preserving and safeguarding.When inquiring about API and being called, explorer can according to the sampled value <C of last 3 times of each attribute of each AP of requesting query
3, C
2, C
1>, wherein C
1be up-to-date sampled value, draw numerical value C responsively according to following formulae discovery
r=0.2*C
3+ 0.3*C
2+ 0.5*C
1, so both considered current AP load, and also with reference to account of the history, made property value have more representativeness.
Step 5, NRQP server is different according to the pattern of setting, and under decision-making mode, oneself calculates according to return value and user's request preference, and decision information result obtained sends to STA, under query pattern, directly return value is transmitted to STA and carries out calculating and decision-making.Computational process adopts analytic hierarchy process (AHP), and according to user's request preference, carry out the structure of nine calibration fuzzy matrixes, the first row represents the attribute that sequence is the highest, and matrix is as follows:
Can calculate its eigenvalue of maximum is 5.2375, and characteristic of correspondence vector is [0.863,0.4401,0.217,0.1067,0.0561] as weight vectors
tand consistency checking is carried out to it, calculate coincident indicator CI=0.0594, same order random index RI=1.12, random Consistency Ratio CR=0.053 < 0.1, illustrates that gained weighted value has satisfactory consistency.According to this weighted value, the comprehensive grading attribute after normalization being carried out to AP calculates and sorts, and can obtain target AP.
Step 6, STA, according to the result calculated, determines target AP, carries out associating or the action such as switching.
Step 7, when network state changes or STA moves, such as current AP load becomes heavy, has user to carry out mass data transmission, and explorer can by calling the interface of NRQP server, and notice STA initiates new inquiry, reselects AP.
Access point selective system provided by the invention and method, before accessing terminal to network, obtain network state information, achieve work station carries out access point optimum choice according to network condition, more effectively carry out access point selection, make offered load more balanced, improve terminal communication performance.
Although describe embodiments of the present invention by reference to the accompanying drawings, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, such amendment and modification all fall into by within claims limited range.
Claims (10)
1. an access point selective system, is characterized in that, comprising: controller, explorer, server, work station, multiple access point;
Described access point is for sending the solicited message of work station to described server, and described request information comprises signal strength information and user's request preference;
Described server is used for calling explorer according to the solicited message of work station and obtains network state information;
Described explorer gathers described network state information for the northbound interface calling described server;
Under small scale network, described explorer is used for obtaining optimum access point according to described network state information and signal strength information in conjunction with user's request preference;
Under large scale network, described server is used for the network state information of acquisition to be sent to work station through access point, obtains optimum access point to make described work station;
Wherein, described network state information comprises the bottleneck bandwidth that the load demand number of access point, channel utilization, retransmission rate and access point export to local area network (LAN);
Described user's request preference be to access point selection according to the sequence of property value set, described to access point selection according to property value set comprise: the bottleneck bandwidth that the load demand number of received signal strength indicator value, access point, channel utilization, retransmission rate and access point export to local area network (LAN).
2. access point selective system according to claim 1, is characterized in that, described server obtains network state information specifically for the API vlan query protocol VLAN calling explorer according to the solicited message of work station.
3. the selective system of access point according to claim 1, is characterized in that, the network state information after change, also for when described network state information changes, is sent to access point by the API of invoking server by described explorer.
4. access point selective system according to claim 3, is characterized in that, described access point also for, receive explorer send change after network state information after, the network state information after described change is forwarded to work station.
5. access point selective system according to claim 1, is characterized in that, between described access point and controller, be also provided with at least one switch.
6. an access point system of selection, is characterized in that, comprising:
Before work station association access point, obtain the signal strength signal intensity of multiple access point, access point maximum for signal strength signal intensity is defined as inquire about access point;
After server receives the workstation requests information of described inquiry access point forwarding, call explorer and obtain network state information, described request information comprises signal strength information and user's request preference;
Under small scale network, explorer obtains optimum access point according to described network state information and signal strength information in conjunction with user's request preference;
Under large scale network, the network state information of acquisition is sent to work station through described inquiry access point by described server, obtains optimum access point to make described work station;
The described optimum access point of described work station association;
Wherein, described network state information comprises the bottleneck bandwidth that the load demand number of access point, channel utilization, retransmission rate and access point export to local area network (LAN);
Described user's request preference be to access point selection according to the sequence of property value set, described to access point selection according to property value set comprise: the bottleneck bandwidth that the load demand number of received signal strength indicator value, access point, channel utilization, retransmission rate and access point export to local area network (LAN).
7. access point system of selection according to claim 6, is characterized in that, described explorer obtains optimum access point according to described network state information and signal strength information in conjunction with user's request preference, comprising:
Described explorer adopts analytic hierarchy process (AHP) to construct five scales or nine scale fuzzy matrixes according to described network state information and signal strength information in conjunction with user's request preference, obtain the score of each access point, access point the highest for score is defined as optimum access point.
8. access point system of selection according to claim 6, is characterized in that, described server calls explorer obtains network state information, comprising:
The API vlan query protocol VLAN of described server calls explorer obtains network state information.
9. access point system of selection according to claim 6, is characterized in that, also comprise:
When described network state information changes, the network state information after change is sent to access point by the API calling described server by described explorer.
10. access point system of selection according to claim 9, is characterized in that, also comprise:
After the network state information of described access point after the change receiving explorer transmission, the network state information after described change is forwarded to work station.
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