CN105430700B - WLAN motion management method based on the association access of more virtual access point - Google Patents

WLAN motion management method based on the association access of more virtual access point Download PDF

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Publication number
CN105430700B
CN105430700B CN201510886004.9A CN201510886004A CN105430700B CN 105430700 B CN105430700 B CN 105430700B CN 201510886004 A CN201510886004 A CN 201510886004A CN 105430700 B CN105430700 B CN 105430700B
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client
lsvap
access point
rssi
access
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CN105430700A (en
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徐川
韩远兵
倪名
靳文强
唐红
赵国锋
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Chongqing University of Post and Telecommunications
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Chongqing University of Post and Telecommunications
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A kind of WLAN motion management method based on the association access of more virtual access point, including step is claimed in the present invention：AP first is responsible for monitoring the radio frames from client, and is forwarded to SDN controllers；Then a LSVAP mapped one by one is generated by the client that SDN controllers are request access, and the signal strength RSSI by client on each AP makes comparisons with preset threshold value HTresRSSI respectively, the AP by controller to RSSI more than or equal to HTresRSSI issues the order for generating LSVAP；Then AP completes certification using LSVAP and client, is associated with interactive process, realizes that multiple spot is associated with access simultaneously；The assignment of traffic for being generated client using shunting mechanism can be obviously improved client handling capacities to multiple while access AP；When client signal strengths are less than threshold value HTresRSSI on AP, the order for removing LSVAP is issued by control terminal.The present invention can not only reinforce the reliability of wireless data transmission, more be obviously improved client handling capacities, improve the utilization rate of radio resource under dense deployment environment.

Description

WLAN motion management method based on the association access of more virtual access point
Technical field
It is the invention belongs to mobile communication technology field, more particularly to a kind of based on the wireless of more virtual access point association access LAN motion management method.
Background technology
Nearly ten years, mobile Internet is grown rapidly, and mobile terminal (such as smart mobile phone, tablet, laptop) makes With increasingly popularizing, mobile cellular network is faced with the challenge of transmission mass data.In order to mitigate the burden of cellular network, it is based on The dense deployment of the WLAN (Wireless Location Area Network, WLAN) of IEEE802.11 also everywhere may be used See.However, there are following two deficiencies for existing WLAN deployment scheme：(1) due in IEEE802.11 standards client moving It must disconnect and be associated with old AP during dynamic, re-start association process with new AP, just can proceed with data transmission, this is cut The time delay for changing process generation is larger, and to VoIP, the business of real-time video and TCP connection causes larger shake, causes to connect It disconnects.(2) WLAN does not have a kind of mechanism for centralized control mobile terminal association access point, and the selection of association access point is by end End determines, and client can only be associated with an access point.Above-mentioned deficiency limits the effective mobile management of WLAN.Meanwhile making Wireless resource utility efficiency is relatively low in intensive AP environment, the data transfer bandwidth that client is obtained is small, influences QoS (Quality of Service)。
With the appearance of software defined network (Software Defined Network, abbreviation SDN), network centralized control Thought become focus of people's attention.Under the driving of SDN New Waves, people attempt SDN control and forward separatings Thought is introduced into WLAN, to solve the problems, such as that WLAN exists.The advantages that network centralized control and Network Programmable of SDN, More fine-grained network-control can be provided, in addition the thought of virtualization, can be very good the deficiency for solving existing WLAN.
Invention content
For following existing deficiency, it is proposed that a kind of wireless resource utility efficiency promoted under dense deployment environment is reinforced The reliability of wireless data transmission is more obviously improved the wireless office based on the association access of more virtual access point of client handling capacities Domain network mobility management method..Technical scheme is as follows：A kind of wireless office based on the association access of more virtual access point Domain network mobility management method comprising following steps：
101, it is responsible for monitoring the request from client by wireless access node AP/ first and accesses frame, works as reception Then request access frame is then forwarded to software defined network SDN controllers；
102, then one is generated by the client that software defined network SDN controllers are request access to reflect one by one The soft virtual access point LSVAP of lightweight penetrated, and it is strong to extract signal of the client on each wireless access node AP Spend RSSIi；；
103, the RSSI for extracting SDN controllersiIt makes comparisons with the signal strength threshold value HTresRSSI of setting, if RSSIiMore than or equal to HTresRSSI, then controller issues addition lightweight is soft and virtually connects to corresponding wireless access node AP The control command of access point LSVAP, and the information for transmitting the soft virtual access point LSVAP of lightweight is controlled to wireless access node AP End generates an AP set-APGroup, and the AP for having issued the soft virtual access point LSVAP of lightweight is added to APGroup, with Afterwards, AP can utilize LSVAP to make corresponding response to the certification request and association request of client, complete IEEE802.11 agreements Defined certification, association interaction flow, realize the wireless access of client；Otherwise, any operation is not done, continues to wirelessly visit Ask the RSSI for the client that node AP is uploaded；
104, in client moving process, SDN controllers take publish/subscribe mechanism to obtain being somebody's turn to do on each point AP The signal strength RSSI of clienti；For not in AP set APGroup and signal strength RSSIiIt is greater than or equal to The AP of HTresRSSI, the control command of the soft virtual access point LSVAP of addition lightweight is issued by control terminal, and transmits lightweight APGroup is added to the AP, while by wireless access node AP in the information of soft virtual access point LSVAP；For in APGroup In and RSSIiAP less than HTresRSSI is issued the order for removing LSVAP by control terminal, and the AP is deleted from APGroup It removes.
Further, when publish/subscribe mechanism, when SDN controllers take publish/subscribe mechanism, all AP, which are in, monitors Pattern, the radio frames for perceiving client obtain its RSSI.
Further, the soft virtual access point LSVAP of the lightweight is that an abstract mobile terminal is associated with physics AP The information of system records, and for completing client wireless access, includes mainly：The MAC Address of terminal, the IP address of terminal, control The virtual basic service sets of device distribution identify address BSSID, the network name SSID of terminal access and OpenFlow flow rule Then.
Further, customized handle is taken to be transmitted into row information between control terminal and AP, including add_lsvap, remove_lsvap。
Further, signal strength threshold value HTresRSSI is set as -70dBm.
It advantages of the present invention and has the beneficial effect that：
Present invention employs the network architectures that SDN and virtualization are combined, and construct and meet 802.11 consensus standards LSVAP is for the incidence relation between decoupling client and physics AP.The method is made using the network overall situation control of controller With the access decision of terminal being transferred to controller end, complete client using LSVAP is associated with access with multiple AP simultaneously. During client is moved, mobile management is realized by dynamically adding/deleting corresponding LSVAP on different AP. Also, this method can also promote the wireless resource utility efficiency under dense deployment environment, reinforce the reliability of wireless data transmission, More it is obviously improved client handling capacities.
Description of the drawings
Fig. 1 is that the present invention provides the more virtual access point association access network architecture diagrams of WLAN of the preferred embodiment based on SDN；
Fig. 2：WLAN mobile management flow chart based on the association access of more virtual access point.
Specific implementation mode
Below in conjunction with attached drawing, the invention will be further described：
As shown in Figure 1, the present invention provides a kind of wireless local network mobilities based on the association access of more virtual access point Management method.This method is acted on by the overall situation of SDN controllers, and client is uniformly issued on different physics AP by controller Corresponding LSVAP completes the wireless access of client using the multiple LSVAP being distributed on different AP.More virtual access point nets Network framework is as shown in Figure 1.Meanwhile in client moving process, by obtain RSSIs of the client on each point AP and with HTresRSSI realizes dynamic addition/deletion of LSVAP, to realize the movement of " client is moved, and LSVAP is moved " Property management strategy.
Below in conjunction with the accompanying drawings 2, the specific of the motion management method based on the association access of more virtual access point is described in detail Step：
201：AP in wireless space residing for client forwards its network request to controller；
202：Controller extracts signal strength RSSIs of the client on each APi, and it is corresponding for client generations LSVAP；
203：According to the comparison result of the RSSIi of control terminal extraction and the signal strength threshold value HTresRSSI of setting, control Device processed makes corresponding operation；
204：If RSSIiMore than or equal to HTresRSSI, then controller issues the control of addition LSVAP to corresponding AP Order, and the information of LSVAP is transmitted to AP.Meanwhile control terminal is that the client generates an AP set-APGroup, by the AP It is added into gathering；Otherwise, any operation is not done, continues to the RSSI of the client of AP uploads；
205：In client moving process, control terminal takes publish/subscribe mechanism to obtain in the whole network the client in each point Signal strength RSSI on APi；
206：Inquiry uploads the AP of the RSSI of client whether in above-mentioned APGroup.If not existing, then follow the steps 207；Otherwise, step 209 is executed；
207：Judge whether the RSSI that new AP is uploaded is greater than or equal to HTresRSSI.If meeting condition, then follow the steps 208；Otherwise, any operation is not done, and AP continues to monitor and upload the RSSI of client；
208：The control command of addition LSVAP is issued by control terminal, and transmits the information of LSVAP to the AP, and will be new AP is added in above-mentioned APGroup；
209：Judge whether the RSSI that associated AP has been uploaded is greater than or equal to HTresRSSI.If meeting condition, do not do Any operation, AP continue to monitor and upload the RSSI of client；Otherwise, step 210 is executed；
210：The order for removing LSVAP is issued by control terminal, and the AP is deleted from APGroup.
In short, the foregoing is merely presently preferred embodiments of the present invention, it is all according to impartial made by scope of the present invention patent Variation and modification, should all belong to the covering scope of patent of the present invention.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limit the scope of the invention. After the content for having read the record of the present invention, technical staff can make various changes or modifications the present invention, these equivalent changes Change and modification equally falls into the scope of the claims in the present invention.

Claims (5)

1. a kind of WLAN motion management method based on the association access of more virtual access point, which is characterized in that including Following steps：
101, it is responsible for monitoring the request from client by wireless access node AP/ first and accesses frame, when received Request access frame is then forwarded to software defined network SDN controllers；
102, then one is generated by the client that software defined network SDN controllers are request access to map one by one The soft virtual access point LSVAP of lightweight, and extract signal strength of the client on each wireless access node AP RSSIi, wherein the soft virtual access point LSVAP of lightweight meets 802.11 consensus standards, is used for decoupling client and object Manage the incidence relation between AP；
103, the RSSI for extracting SDN controllersiIt makes comparisons with the signal strength threshold value HTresRSSI of setting, if RSSIiGreatly In or be equal to HTresRSSI, then controller to corresponding wireless access node AP issue addition the soft virtual access point of lightweight The control command of LSVAP, and the information of the soft virtual access point LSVAP of lightweight is transmitted to wireless access node AP, control terminal production A raw AP set-APGroup, the AP for having issued the soft virtual access point LSVAP of lightweight is added to APGroup, then, AP Corresponding response is made to the certification request and association request of client using LSVAP, is completed as defined in IEEE802.11 agreements Certification, association interaction flow, realize the wireless access of client；Otherwise, any operation is not done, continues to wireless access node The RSSI for the client that AP is uploaded；
104, in client moving process, SDN controllers take publish/subscribe mechanism to obtain being somebody's turn to do on each point AP The signal strength RSSI of clienti；For not in AP set APGroup and signal strength RSSIiIt is greater than or equal to The AP of HTresRSSI, the control command of the soft virtual access point LSVAP of addition lightweight is issued by control terminal, and transmits lightweight APGroup is added to the AP, while by wireless access node AP in the information of soft virtual access point LSVAP；For in APGroup In and RSSIiAP less than HTresRSSI is issued the order for removing LSVAP by control terminal, and the AP is deleted from APGroup It removes.
2. the WLAN motion management method according to claim 1 based on the association access of more virtual access point, It is characterized in that, working as publish/subscribe mechanism, when SDN controllers take publish/subscribe mechanism, all AP are in listening mode, Radio frames for perceiving client obtain its RSSI.
3. the WLAN mobile management side according to claim 1 or 2 based on the association access of more virtual access point Method, which is characterized in that the soft virtual access point LSVAP of lightweight is an abstract mobile terminal and physics AP incidence relations Information records, and for completing client wireless access, includes mainly：The MAC Address of terminal, the IP address of terminal, controller point The virtual basic service sets mark address BSSID matched, the network name SSID and OpenFlow flow rule of terminal access.
4. the WLAN motion management method according to claim 3 based on the association access of more virtual access point, It is characterized in that, customized handle is taken to be transmitted into row information between control terminal and AP, including add_lsvap, remove_ lsvap。
5. the WLAN motion management method according to claim 4 based on the association access of more virtual access point, It is characterized in that, signal strength threshold value HTresRSSI is set as -70dBm.
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CN105898809A (en) * 2016-05-25 2016-08-24 努比亚技术有限公司 WiFi connection management device and method, and mobile terminal
CN107979877B (en) 2016-10-25 2021-01-01 华为技术有限公司 Method, equipment and central access point for associating wireless local area network
CN109600811A (en) * 2019-01-28 2019-04-09 重庆邮电大学 WLAN seamless handover method and equipment based on location aware

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