CN107135523A - A kind of management method of 802.11 wireless access networks based on software defined network - Google Patents
A kind of management method of 802.11 wireless access networks based on software defined network Download PDFInfo
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- CN107135523A CN107135523A CN201710272575.2A CN201710272575A CN107135523A CN 107135523 A CN107135523 A CN 107135523A CN 201710272575 A CN201710272575 A CN 201710272575A CN 107135523 A CN107135523 A CN 107135523A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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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
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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Abstract
The invention discloses a kind of management method of 802.11 wireless access networks based on software defined network.802.11 wireless access networks include SDN controllers, network application and more than one WAP.WAP is responsible for handling 802.11 frames of wireless terminal transmission and sends 802.11 frames to wireless terminal, simultaneously, WAP is by OpenFlow protocol extensions functional interface to SDN controller report access requests, link circuit condition and event-triggered message, the OpenFlow message that SDN controllers processing WAP is sent, issued to WAP and set up virtual radio access point, the request of received signal strength indicator trigger, SDN controllers provide the REST interfaces of developing network application to the network application on upper strata, network application is responsible for accessing wireless terminal, switching behavior and disturbance regime and channel configuration are managed.The present invention realize to 802.11 wireless access networks carry out centralized management so that SDN controllers can higher management net can manage wireless access network again.
Description
Technical field
The present invention relates to the management method of a kind of software defined network and 802.11 wireless access networks, belong to communication network neck
Domain.
Background technology
The demand that current people access to wireless network is increasing, concurrently supports the network of wireless data service to set
Standby use is also increasingly wider, and the demand that entire society accesses to wireless network is growing.The 802.11 of IEEE propositions are wireless
Access technology is rapidly progressed in the past more than ten years, and provides wireless network as enterprise, campus and public place
The key technology of network access.
Because the service range of a WAP is limited to very much, in order to expand wireless access scope and improve service
Quality, enterprise network or campus network would generally carry out large-scale WAP deployment.However, carrying out the big of WAP
Still suffered from Scaledeployment much the problem of can not be ignored, on the one hand, the solution that network equipment vendor provides be it is privately owned,
Poor compatibility, client must buy a whole set of expensive hardware and software equipment；It is privately owned soft that another aspect equipment vendor provides
It is limited that part management platform, which can provide managerial ability, so that network manager neatly can not be managed to the network equipment
And configuration.
SDN（Software defined network）It is a kind of new network architecture, separation and SDN by data surface and chain of command
Controller carries out centralized management neatly to manage network to the network equipment of bottom.Utilize SDN, network function developer
The network equipment of relation bottom is not needed, it is only necessary to be programmed according to the interface that SDN controllers are provided, this new network frame
Structure substantially increases automatic management and the control ability of network, in addition, south of the OpenFlow agreements as main flow in SDN frameworks
One kind into interface, with opening, SDN controllers support the OpenFlow network equipment by OpenFlow protocol integrated test systems
Forwarding strategy is performed, the forwarding unit under SDN frameworks is only needed to according to the corresponding forwarding behaviors of strategy execution of SDN controllers i.e.
Can, the mode of this chain of command and data surface separation causes the cost of hardware switch or forwarding unit to substantially reduce, and tool
There is stronger versatility.
It is worth noting that, SDN application scenarios are concentrated mainly in data center at present, not applied to wireless access
Net.How the interchanger of Ethernet is controlled in fact, OpenFlow agreements define only, so SDN control at present
Device can only carry out the control of centralization to Ethernet switch, and wireless access network can not be managed.
The content of the invention
It is an object of the invention to provide a kind of management method of 802.11 wireless access networks based on software defined network, lead to
Cross and realize SDN controllers to the WAP in 802.11 wireless access networks the progress radio function extension of OpenFlow agreements
Centralized management is carried out, so as to solve at present present in wireless access network management the problem of poor compatibility.
The present invention realizes that its purpose is adopted the technical scheme that：
802.11 wireless access network bags described in the management method of 802.11 wireless access networks of the invention based on software defined network
SDN controllers, network application and more than one WAP are included, the network application includes access-in management application, switching pipe
It ought to use and channel configuration and interference management application；OpenFlow agreements are provided with expanded function interface, and the expanded function connects
Mouth includes access management function interface, handover management functional interface and interference management functional interface；SDN controllers will be received
The access request of wireless terminal reports access-in management application, and access-in management applies disappearing in received access request
Breath formulates access strategy and sends execution access request to SDN controllers, and the execution access request is converted into control by SDN controllers
Message processed and being sent to the control message by the access management function interfaces of OpenFlow agreements is treated and the wireless terminal is closed
The OpenFlow agencies of the target wireless access points of connection, OpenFlow agencies decide whether to permit according to the control message received
Perhaps wireless terminal access target wireless access points, if the wireless terminal is allowed to and accesses target wireless access points, switch
Management application issues the request being monitored to the Link State of the wireless terminal to SDN controllers, and SDN controllers receive this please
Backward each WAP is asked to issue the request for the Link State for monitoring the wireless terminal, if the Link State of the wireless terminal is touched
Handover event is sent out, then the WAP triggered by Link State is cut by handover management functional interface to SDN controller reports
Change event, the handover event received is reported handover management network application by SDN controllers, handover management network application according to
Message in received handover event formulates switchover policy and sends execution handover request, SDN controllers to SDN controllers
The execution handover request is converted into corresponding control message and the control message is sent to by handover management functional interface
The OpenFlow agencies for the new WAP that target wireless access points and treating are associated with the wireless terminal, two OpenFlow
Agency is switched to the WAP associated with the wireless terminal by target wireless access points according to the control message received
New WAP；
Interference information between the WAP received is reported channel configuration and interference management application by SDN controllers,
Channel configuration and interference management, which are applied, to be formulated channel assignment strategy according to received interference information and is sent to SDN controllers
The request of the channel configuration of WAP is performed, the request is converted into control message and by OpenFlow by SDN controllers
The interference management functional interface of agreement acts on behalf of the OpenFlow that the control message is sent to all WAPs, each wirelessly to connect
The OpenFlow agencies of access point carry out reconfiguring for channel according to the control message received.
Further, in the present invention, wireless terminal accesses WLAN after access request is sent to target wireless access points,
Target wireless access points are received after access request by access management function interface to SDN controllers forwarding access request,
Information reporting in the access request received is given access-in management application by SDN controllers by REST interfaces, and access-in management should
Decide whether to allow the wireless terminal to access with the permission access list according to setting：If the wireless terminal is allowing to access
Among list, then access-in management applies the request for being sent to SDN controllers and accessing the wireless terminal, and SDN controllers ask this
It is converted into control message and control message is sent to the OpenFlow of target wireless access points by access management function interface
Agency, OpenFlow agencies are established as the radio terminal service according to the control message received on target wireless access points
Virtual radio access point.
Further, in the present invention, when wireless terminal accesses target wireless access points, handover management, which is applied, passes through REST
Interface issues the request being monitored to the Link State of the wireless terminal to SDN controllers, and SDN controllers are received after the request
The request for the Link State for monitoring the wireless terminal is issued to each WAP, if the Link State of the wireless terminal is triggered
The trigger of the reception signal designation intensity of WAP setting, the then WAP triggered by Link State passes through switching
The handover event received is passed through REST interfaces by management function interface to the SDN controller reports handover event, SDN controllers
Handover management application is reported, handover management is to be associated using determining whether the wireless terminal is switched to according to the handover event
New WAP, if determining switching, handover management to SDN controllers using sending execution handover request, SDN controllers
The execution handover request is converted into corresponding control message and the control message is sent to by handover management functional interface
The OpenFlow agencies of target wireless access points and new WAP, OpenFlow agency's bases of target wireless access points should
Control message deletes former virtual radio access point, and the OpenFlow agencies of new WAP set up new empty according to the control message
Intend WAP.
Further, in the present invention, each WAP by interference management functional interface periodically to SDN controls
Device reports the interference message of WAP, and the interference message of the WAP includes the link circuit condition of each WAP
And each WAP is by the disturbed condition of surrounding wireless access points, SDN controllers are by the interference message of each WAP
Channel configuration and interference management application are reported, channel configuration is applied according to the interference information received to each nothing with interference management
Asking for the channel configuration of execution WAP is generated strategy and sent to SDN controllers to the channel configuration of line access point work
Ask, the request is converted into control message and is sent to the control message respectively by interference management functional interface by SDN controllers
The OpenFlow agencies of WAP, each OpenFlow agencies are according to work of the control message received to each WAP
Make channel to be reconfigured.
Compared with prior art, the beneficial effects of the invention are as follows：By carrying out radio function extension to OpenFlow agreements,
The functional interface of extension includes：Radio access management functional interface, handover management functional interface and interference management functional interface.From
And realize centralized management of the SDN controllers to WAP using open OpenFlow interfaces so that SDN controllers were both
Energy higher management net can manage wireless access network again, solve poor compatibility between existing WAP and wireless controller
Problem.Meanwhile, it is serviced by setting up VAP for each wireless terminal, improve wireless terminal switching when
Flexibility, can reduce the time delay of switching.In addition, SDN controllers can be according to the operation conditions of wireless network to wireless access
The channel configuration of Mobile state is clicked through, the interference between WAP is reduced, the performance of system is improved.The present invention is based on
The controller of OpenFlow extensions can carry out global monitoring, dynamic management and distribution Internet resources to network condition, further
Optimize network performance.
Brief description of the drawings
Fig. 1 is the network architecture schematic diagram of management method of the present invention.
Embodiment
As shown in figure 1,802.11 wireless network architectures used in management method of the present invention include several WAPs, one
Individual SDN controllers and several network applications（APP）.Wherein, network application is responsible for carrying out layout to network function, in this hair
In bright, these network applications include access-in management application, handover management application and channel configuration and interference management application.This
Network function is handed down to SDN controllers by a little applications by REST interfaces to be realized.SDN controllers are responsible for each wireless access
Point, event message and status information that processing WAP is reported, and realize that the network function that each network application is issued please
Ask.Each WAP generally includes wireless network card, Ethernet card, system kernel and realizes OpenFlow Extended Protocols
OpenFlow is acted on behalf of.Wireless network card and Ethernet card are each responsible for sending and receiving 802.11 frames and ethernet frame, system kernel
The responsible data frame progress that will be received from wireless network card and Ethernet card is processed and forwarded to OpenFlow and acted on behalf of into traveling one
Step processing, while the packet for needing to send is passed to system kernel and is transmitted by OpenFlow agencies.OpenFlow is acted on behalf of
It is responsible for completing to provide wireless terminal service according to the request of controller, reports trigger event and link information and channel to switch
Etc. function.
The access-in management application, handover management application and channel configuration and interference management application work(of application layer are just realized below
Can, it is described in detail with specific embodiment.
1st, access-in management is realized
As shown in figure 1, illustrating wireless access pipe by taking wireless terminal STA1 and wireless terminal STA2 access WAPs 1 as an example
Manage access-in managements of the APP to wireless terminal.Wireless terminal STA1 and wireless terminal in range of signal in WAP 1
STA2 is sent on Probe Request management frames, WAP 1 to WAP 1 respectively before access WLAN
802.11 wireless network cards are received after the signal about Probe Request management frames, and the system kernel in WAP 1 is carried
Take out Probe Request management frames and the additional information relevant with the frame is added in frame head portion（Including time synchronized function
Timer, channel, RSSI, power and speed）, then system kernel Probe Request management frames are passed to
OpenFlow is acted on behalf of, the information relevant with wireless terminal under OpenFlow proxy records（Including MAC Address, RSSI, channel, when
Between synchronizing function timer, power and speed）And by the access management function interfaces of OpenFlow agreements to SDN controllers
The Probe Request message about wireless terminal STA1 and wireless terminal STA2 is sent, SDN controllers receive Probe
The event is reported to access-in management application by REST interfaces after Request message, access-in management applies the permission according to setting
Access list decide whether allow wireless terminal STA1 and wireless terminal STA2 access and decision is performed by SDN controllers,
Allow access list as wireless terminal STA1 and wireless terminal STA2 is in, then allow it to access and sent to SDN controllers and hold
Row access request, otherwise refuses its access.If allowing wireless terminal STA1 and wireless terminal STA2 to access, then SDN is controlled
The execution access request is converted into control message and is controlled this by the access management function interface of OpenFlow agreements by device
Message is sent to the OpenFlow agencies treated with wireless terminal STA1 and wireless terminal the STA2 target wireless access points 1 associated,
I.e. SDN controllers are sent by the access management function interface of OpenFlow agreements to the OpenFlow agencies of WAP 1
VAP request is set up for wireless terminal STA1 and wireless terminal STA2 and issues Probe Response message.WAP 1
On OpenFlow agencies receive and set up after VAP request, be that wireless terminal STA1 sets up the VAP1 individually serviced for it, be
Wireless terminal STA2 sets up the VAP2 individually serviced for it, and be responsible for respectively to wireless terminal STA1 and nothing from VAP1 and VAP2
Line terminal STA 2 sends Probe Response management frames and Beacon management frames, and wherein Beacon frames, which are contained, multiple wirelessly connects
The SSID that access point is supported（Service set）, wireless terminal STA1 and wireless terminal are just hereafter handled by VAP1 and VAP2 respectively
802.11 wireless management frames and data frame that STA2 is sent.Wireless terminal STA1 and wireless terminal STA2 receive Beacon pipes
Manage to the transmission Authentication Request management frames of WAP 1 after frame, VAP1 and VAP2 receive certification request
Authentication Response management frames are sent to wireless terminal afterwards, then wireless terminal STA1 and wireless terminal STA2
Association Request management frames are sent to WAP 1, VAP1 and VAP2 are received after association request respectively to nothing
Line terminal STA 1 and wireless terminal STA2 send Association Response management frames, so far, wireless terminal STA1 and nothing
Line terminal STA 2 has been successfully accessed WLAN.Likewise, STA3 and STA4 in the range of signal of WAP 2 are also with same
The mode of sample accesses WAP 2.
OpenFlow agreements are open interfaces, and SDN controllers are supported by OpenFlow consultative managements and control
The WAP of OpenFlow agreements, solves the problem of SDN controllers and WAP can not be compatible.
2nd, handover management is realized
If wireless terminal STA1 and wireless terminal STA2 are allowed to and access wireless network, handover management is applied and connect by REST
Mouth issues the monitoring request of the Link State to wireless terminal STA1 and wireless terminal STA2 to SDN controllers, and SDN controllers are received
Wireless terminal STA1 is issued to all WAPs by the handover management functional interface of OpenFlow agreements after to the request
Monitoring with wireless terminal STA2 Link State is asked, and is monitored when setting up the WAP 1 associated with wireless terminal STA1
Link State to wireless terminal STA1 is deteriorated, and the RSSI received is less than threshold value（Such as -70dBm）When, now trigger
Handover event.VAP1 on WAP 1 is by the handover management functional interfaces of OpenFlow agreements to SDN controllers
Handover event is reported, the handover event received is reported handover management application by SDN controllers by REST interfaces, simultaneously
SDN controllers notify all other WAP to be monitored wireless terminal and are higher than threshold value in the RSSI received
（Such as -50dBm）When to SDN controller report trigger events, SDN controllers collect that all WAPs report on switching
Event message and give handover management application by information reporting, handover management is using determining the wireless end according to the handover event
Whether end is switched to new WAP to be associated, if determining switching, and handover management is applied as wireless terminal STA1 selections
The WAP that RSSI value is more than threshold value in WAP and current load is minimum is switched over and to SDN controls
Device sends execution handover request, and the execution handover request is converted into corresponding control message and managed by switching by SDN controllers
Reason functional interface acts on behalf of the OpenFlow that the control message is sent to target wireless access points and new WAP, target without
The OpenFlow agencies of line access point delete former virtual radio access point according to the control message, new WAP
OpenFlow agencies set up new virtual radio access point according to the control message.This switching flow need not carry out re-authentication
And association, switching time is shortened, service quality is improved.
3rd, channel configuration and interference management are realized
In order to avoid the adjacent WAP of physical location is operated on adjacent or identical channel, it is necessary to WAP
Between disturbance regime be monitored and neatly switching WAP work channel, improve WAP work effect
The service quality of rate and whole network.The wireless network card of each WAP receives nothing of the surrounding all working in same frequency range
Wireless signal that line terminal and other WAPs are sent simultaneously is sent to system kernel, and system kernel is from the data flow received
In extract 802.11 frames, and the information of 802.11 frame will be obtained about when will receive radio frames（Including time synchronized function
Timer, channel, RSSI, power and speed）It is added to frame head and is sent to OpenFlow agencies, OpenFlow acts on behalf of basis
Wireless terminal and other WAPs around the source of 802.11 frames and address information recording and this WAP it
Between link-quality and disturbed condition.As shown in figure 1, the interference size of the monitoring WAP 2 of WAP 1 and wireless
The signal quality of terminal STA 1 and wireless terminal STA2, the interference size of the monitoring WAP 1 of WAP 2 and wireless
OpenFlow proxy records on the signal quality of terminal STA 3 and wireless terminal STA4, WAP 1 and WAP 2
The interference information and the signal quality for associating wireless terminal of lower neighbouring WAP, and the interference pipe for passing through OpenFlow agreements
Interface is managed periodically to SDN controller reports link-quality and interference information, SDN controllers are collected and handle each wireless access
The message that point is reported, if there is multiple（Such as more than 3）The adjacent WAP of physical location is operated in same channel, letter
Road configures to apply with interference management and redistributes working channel for WAP and send execution wireless access to SDN controllers
The request is converted into control message and should by interference management functional interface by the request of the channel configuration of point, SDN controllers
Control message is sent to the OpenFlow agencies of each WAP, and each OpenFlow agencies are according to the control message pair received
The working channel of each WAP is reconfigured..The channel point crossed by channel configuration and interference management optimizing application
Method of completing the square ensure that the stability of the service quality of system, realize the automatic configuration of WAP, more adapt to existing
In flexible deployment scheme.
Claims (4)
1. a kind of management method of 802.11 wireless access networks based on software defined network, it is characterised in that：Described 802.11
Wireless access network includes SDN controllers, network application and more than one WAP, and the network application includes access-in management
Using the application of, handover management and channel configuration and interference management application；OpenFlow agreements are provided with expanded function interface, institute
Stating expanded function interface includes access management function interface, handover management functional interface and interference management functional interface；SDN is controlled
The access request of the wireless terminal received is reported access-in management application by device, and access-in management is applied and connect according to received
Enter the message in request to formulate access strategy and send execution access request to SDN controllers, SDN controllers access the execution
Request be converted into control message and the control message is sent to by the access management function interfaces of OpenFlow agreements treat with
The OpenFlow agencies of the target wireless access points of wireless terminal association, OpenFlow agencies disappear according to the control received
Breath decides whether to allow the wireless terminal to access target wireless access points, if the wireless terminal is allowed to and accesses Target Wireless to connect
Access point, the then request that handover management is monitored using being issued to SDN controllers to the Link State of the wireless terminal, SDN controls
Device processed receives the request that the backward each WAP of the request issues the Link State for monitoring the wireless terminal, if the wireless terminal
Link State triggering handover event, then the WAP triggered by Link State is by handover management functional interface to SDN
The handover event received is reported handover management network application, handover management by controller report handover event, SDN controllers
Message of the network application in received handover event formulates switchover policy and sends execution switching to SDN controllers and asks
Ask, the execution handover request is converted into corresponding control message and is controlled this by handover management functional interface by SDN controllers
Message processed is sent to target wireless access points and treats the OpenFlow agencies of new WAP associated with the wireless terminal, should
Two OpenFlow agencies are according to the control message received by the WAP associated with the wireless terminal by Target Wireless
Access point switches to new WAP；
Interference information between the WAP received is reported channel configuration and interference management application by SDN controllers,
Channel configuration and interference management, which are applied, to be formulated channel assignment strategy according to received interference information and is sent to SDN controllers
The request of the channel configuration of WAP is performed, the request is converted into control message and by OpenFlow by SDN controllers
The interference management functional interface of agreement acts on behalf of the OpenFlow that the control message is sent to all WAPs, each wirelessly to connect
The OpenFlow agencies of access point carry out reconfiguring for channel according to the control message received.
2. a kind of management method of 802.11 wireless access networks based on software defined network according to claim 1, its
It is characterised by：Wireless terminal accesses WLAN after access request is sent to target wireless access points, and target wireless access points are received
Access request is forwarded to SDN controllers by access management function interface after to access request, SDN controllers are connect by REST
Information reporting in the access request received is given access-in management application by mouth, and access-in management is applied allows access according to setting
List come decide whether to allow the wireless terminal access：If the wireless terminal is allowing among access list, access-in management
The request is converted into control message and passed through by the request for accessing the wireless terminal using being sent to SDN controllers, SDN controllers
Access management function interface acts on behalf of the OpenFlow that control message is sent to target wireless access points, and the OpenFlow acts on behalf of root
The virtual radio access point of the radio terminal service is established as on target wireless access points according to the control message received.
3. a kind of management method of 802.11 wireless access networks based on software defined network according to claim 1 or 2,
It is characterized in that：When wireless terminal accesses target wireless access points, handover management, which is applied, passes through REST interfaces to SDN controllers
The request being monitored to the Link State of the wireless terminal is issued, SDN controllers receive the backward each WAP of the request
The request for the Link State for monitoring the wireless terminal is issued, if the Link State of the wireless terminal triggers WAP setting
Reception signal designation intensity trigger, then the WAP triggered by Link State by handover management functional interface to
The handover event received is reported handover management by the SDN controller reports handover event, SDN controllers by REST interfaces
Using handover management is applied and determines whether the wireless terminal is switched to new wireless access to be associated according to the handover event
Point, if determining switching, handover management to SDN controllers using execution handover request is sent, and SDN controllers switch the execution
Request is converted into corresponding control message and the control message is sent into Target Wireless by handover management functional interface and accesses
The OpenFlow of point and new WAP is acted on behalf of, and the OpenFlow agencies of target wireless access points delete according to the control message
Former virtual radio access point, the OpenFlow agencies of new WAP set up new virtual radio according to the control message and accessed
Point.
4. a kind of 802.11 wireless access networks based on software defined network according to any one of claim 1 to 3
Management method, it is characterised in that：Each WAP by interference management functional interface periodically to SDN controller reports without
The interference message of line access point, the interference message of the WAP includes the link circuit condition and each nothing of each WAP
Line access point is by the disturbed condition of surrounding wireless access points, and the interference message of each WAP reports letter by SDN controllers
Road is configured to be applied according to the interference information received to each WAP with interference management application, channel configuration with interference management
The channel configuration of work is generated strategy and the request for the channel configuration for performing WAP is sent to SDN controllers, and SDN is controlled
The request is converted into control message and the control message is sent into each WAP by interference management functional interface by device
OpenFlow agencies, each OpenFlow agency carries out according to the control message received to the working channel of each WAP
Reconfigure.
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| CN108156621A (en) * | 2017-12-05 | 2018-06-12 | 东南大学 | Intensive WLAN interference control methods based on OpenFlow agreements |
| CN108495347A (en) * | 2018-03-05 | 2018-09-04 | 江苏创通电子股份有限公司 | A kind of method of seamless roam |
| CN108495347B (en) * | 2018-03-05 | 2021-01-12 | 江苏创通电子股份有限公司 | Seamless roaming method |
| CN109495295A (en) * | 2018-10-31 | 2019-03-19 | 电子科技大学 | A kind of intelligent management-control method of access |
| CN109495295B (en) * | 2018-10-31 | 2021-02-02 | 电子科技大学 | Access intelligent management and control method |
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