CN105430700A - Wireless local area network mobility management method based on multi-virtual-access-point associated access - Google Patents
Wireless local area network mobility management method based on multi-virtual-access-point associated access Download PDFInfo
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- CN105430700A CN105430700A CN201510886004.9A CN201510886004A CN105430700A CN 105430700 A CN105430700 A CN 105430700A CN 201510886004 A CN201510886004 A CN 201510886004A CN 105430700 A CN105430700 A CN 105430700A
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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
- 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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Abstract
The invention provides a wireless local area network mobility management method based on multi-virtual-access-point associated access. The method comprises the following steps that: firstly, APs (Access Points) monitor a wireless frame from a client, and forward the monitored wireless frame to an SDN (Software Defined Network) controller; the SDN controller generates LSVAPs (Lightweight Soft Virtual Access Points) which are mapped one by one for the client requesting to access, compares received signal strength indicators (RSSIs) of the client on the APs with a preset threshold HTresRSSI respectively, and issues a command of generating the LSVAPs to the APs of which the RSSIs are greater than or equal to the HTresRSSI; the APs finish authentication and associated interaction processes through the LSVAPs and the client in order to realize simultaneous associated access of a plurality of points; traffic generated by the client is allocated to a plurality of APs which are accessed simultaneously through a shunting mechanism in order to remarkably increase the throughput of the client; and when the RSSIs of the client on the APs are smaller than the threshold HTresRSSI, a control end issues a command of removing the LSVAPs. Through adoption of the method, the reliability of wireless data transmission can be enhanced; the throughput of the client is increased remarkably; and the utilization ratio of wireless resources in a dense deployment environment is increased.
Description
Technical field
The invention belongs to mobile communication technology field, particularly a kind of WLAN (wireless local area network) motion management method based on many virtual access point association accesses.
Background technology
Nearly ten years, mobile Internet fast development, the use of mobile terminal (as smart mobile phone, flat board, notebook computer) is more and more universal, and mobile cellular network is faced with the challenge of transmission mass data.In order to alleviate the burden of cellular network, the dense deployment based on the WLAN (WirelessLocationAreaNetwork, WLAN (wireless local area network)) of IEEE802.11 is also seen everywhere.But, there are following two deficiencies in existing WLAN deployment scheme: (1) associates because client in IEEE802.11 standard must disconnect with old AP in moving process, association process is re-started with new AP, just transfer of data can be proceeded, the time delay that this handoff procedure produces is larger, to VoIP, the business that real-time video and TCP connect causes larger shake, causes connecting disconnecting.(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 determined by terminal, and client can only associate an access point.Above-mentioned deficiency limits the effective mobile management of WLAN.Meanwhile, make wireless resource utility efficiency in intensive AP environment lower, the data transfer bandwidth that client obtains is little, affects QoS (QualityofService).
Along with the appearance of software defined network (SoftwareDefinedNetwork is called for short SDN), the central controlled thought of network becomes the focus that people pay close attention to.Under the ordering about of SDN New Wave, people attempt and are incorporated in WLAN by the thought of SDN control and forward separating, in order to solve WLAN Problems existing.The advantages such as the network centralized control of SDN and Network Programmable, can provide more fine-grained network control, add virtualized thought, can well solve the deficiency of existing WLAN.
Summary of the invention
For following existing deficiency, propose a kind of wireless resource utility efficiency promoted under dense deployment environment, strengthen the reliability of Wireless Data Transmission, significantly promote the WLAN (wireless local area network) motion management method based on many virtual access point association accesses of client throughput.。Technical scheme of the present invention is as follows: a kind of WLAN (wireless local area network) motion management method based on many virtual access point association accesses, and it comprises the following steps:
101, be first responsible for the request of monitoring from client by wireless access node AP/ and access frame, request access frame is then forwarded to software defined network SDN controller when received;
102, the client being then request access by software defined network SDN controller produces a soft virtual access point LSVAP of the lightweight mapped one by one, and extracts the signal strength signal intensity RSSI of this client on each wireless access node AP
i;;
103, by the RSSI of SDN controller extraction
imake comparisons, if RSSI with the signal strength threshold value HTresRSSI arranged
ibe more than or equal to HTresRSSI, then controller issues the control command of adding the soft virtual access point LSVAP of lightweight to corresponding wireless access node AP, and the information transmitting the soft virtual access point LSVAP of lightweight is to wireless access node AP, control end produces an AP set-APGroup, the AP having issued the soft virtual access point LSVAP of lightweight is added to APGroup, subsequently, AP can utilize LSVAP to ask to make corresponding response with associating to the authentication request of client, complete the certification that IEEE802.11 agreement specifies, association interaction flow, realize the wireless access of client, otherwise, do not do any operation, continue the RSSI receiving the client that wireless access node AP uploads,
104, in client moving process, SDN controller takes publish/subscribe mechanism to obtain the signal strength signal intensity RSSI of this client on each point AP
i; For not in AP set A PGroup and signal strength signal intensity RSSI
ibe more than or equal to the AP of HTresRSSI, issued the control command of adding lightweight soft virtual access point LSVAP by control end, and the information transmitting the soft virtual access point LSVAP of lightweight is to this AP, this wireless access node AP is added APGroup simultaneously; For in APGroup and RSSI
ibe less than the AP of HTresRSSI, issued the order removing LSVAP by control end, and this AP is deleted from APGroup.
Further, when publish/subscribe mechanism, when publish/subscribe mechanism taked by SDN controller, all AP are in listen mode, for the radio frames of perception client, obtain its RSSI.
Further, described lightweight soft virtual access point LSVAP is the information record of an abstract mobile terminal and physics AP incidence relation, for completing client wireless access, mainly comprise: the MAC Address of terminal, the IP address of terminal, the virtual basic service sets home address BSSID that controller distributes, the network name SSID of terminal access, and OpenFlow flow rule.
Further, take self-defining handle to carry out information transmission between control end and AP, comprise add_lsvap, remove_lsvap.
Further, signal strength threshold value HTresRSSI is set to-70dBm.
Advantage of the present invention and beneficial effect as follows:
Present invention employs SDN and the virtual network architecture combined, constructing the LSVAP of satisfied 802.11 consensus standards for separating the incidence relation between coupling client and physics AP.Described method utilizes the network overall situation control action of controller, and the access decision-making of terminal is transferred to controller end, uses LSVAP to complete client and accesses with associating of multiple AP simultaneously.In the process of client movement, realize mobile management by dynamically adding/deleting corresponding LSVAP on different AP.Further, this method also can promote the wireless resource utility efficiency under dense deployment environment, strengthens the reliability of Wireless Data Transmission, significantly promotes client throughput.
Accompanying drawing explanation
Fig. 1 the invention provides the WLAN many virtual access point association access network Organization Chart of preferred embodiment based on SDN;
Fig. 2: based on the WLAN (wireless local area network) mobile management flow chart of many virtual access point association accesses.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, the invention provides a kind of WLAN (wireless local area network) motion management method based on many virtual access point association accesses.The method, by the overall situation effect of SDN controller, issues LSVAP corresponding to client by controller is unified on different physics AP, utilizes the multiple LSVAP be distributed on different AP to complete the wireless access of client.Many virtual access point network architecture as shown in Figure 1.Meanwhile, in client moving process, by obtaining the RSSI of client on each point AP and realizing the dynamic interpolation/deletion of LSVAP with HTresRSSI, thus realize the Mobility Management Strategy of " client moves, and LSVAP moves thereupon ".
Below in conjunction with accompanying drawing 2, describe the concrete steps of the motion management method based on many virtual access point association accesses in detail:
AP in wireless space residing for 201:client all forwards its network request to controller;
202: controller extracts the signal strength signal intensity RSSI of this client on each AP
i, and produce corresponding LSVAP for this client;
203: the comparative result of the RSSIi extracted according to control end and the signal strength threshold value HTresRSSI of setting, corresponding operation made by controller;
204: if RSSI
ibe more than or equal to HTresRSSI, then controller issues the control command of adding LSVAP to the AP of correspondence, and the information transmitting LSVAP is to AP.Meanwhile, control end produces an AP set-APGroup for this client, is added in set by this AP; Otherwise, do not do any operation, continue the RSSI receiving the client that AP uploads;
In 205:client moving process, control end takes publish/subscribe mechanism to obtain the signal strength signal intensity RSSI of this client on each point AP in the whole network
i;
206: inquiry uploads the AP of the RSSI of client whether in above-mentioned APGroup.If do not exist, then perform step 207; Otherwise, perform step 209;
207: judge whether the RSSI that new AP uploads is more than or equal to HTresRSSI.If satisfy condition, then perform step 208; Otherwise do not do any operation, AP continues to monitor and uploads the RSSI of client;
208: issued by control end and add the control command of LSVAP, and the information transmitting LSVAP is to this AP, and new AP is added in above-mentioned APGroup;
209: judge whether the RSSI that the AP associated uploads is more than or equal to HTresRSSI.If satisfy condition, then do not do any operation, AP continues to monitor and uploads the RSSI of client; Otherwise, perform step 210;
210: issued the order removing LSVAP by control end, and this AP is deleted from APGroup.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
These embodiments are interpreted as only being not used in for illustration of the present invention limiting the scope of the invention above.After the content of reading record of the present invention, technical staff can make various changes or modifications the present invention, and these equivalence changes and modification fall into the scope of the claims in the present invention equally.
Claims (5)
1., based on a WLAN (wireless local area network) motion management method for many virtual access point association accesses, it is characterized in that, comprise the following steps:
101, be first responsible for the request of monitoring from client by wireless access node AP/ and access frame, request access frame is then forwarded to software defined network SDN controller when received;
102, the client being then request access by software defined network SDN controller produces a soft virtual access point LSVAP of the lightweight mapped one by one, and extracts the signal strength signal intensity RSSI of this client on each wireless access node AP
i;;
103, by the RSSI of SDN controller extraction
imake comparisons, if RSSI with the signal strength threshold value HTresRSSI arranged
ibe more than or equal to HTresRSSI, then controller issues the control command of adding the soft virtual access point LSVAP of lightweight to corresponding wireless access node AP, and the information transmitting the soft virtual access point LSVAP of lightweight is to wireless access node AP, control end produces an AP set-APGroup, the AP having issued the soft virtual access point LSVAP of lightweight is added to APGroup, , subsequently, AP utilizes LSVAP to ask to make corresponding response with associating to the authentication request of client, complete the certification that IEEE802.11 agreement specifies, association interaction flow, realize the wireless access of client, otherwise, do not do any operation, continue the RSSI receiving the client that wireless access node AP uploads,
104, in client moving process, SDN controller takes publish/subscribe mechanism to obtain the signal strength signal intensity RSSI of this client on each point AP
i; For not in AP set A PGroup and signal strength signal intensity RSSI
ibe more than or equal to the AP of HTresRSSI, issued the control command of adding lightweight soft virtual access point LSVAP by control end, and the information transmitting the soft virtual access point LSVAP of lightweight is to this AP, this wireless access node AP is added APGroup simultaneously; For in APGroup and RSSI
ibe less than the AP of HTresRSSI, issued the order removing LSVAP by control end, and this AP is deleted from APGroup.
2. the WLAN (wireless local area network) motion management method based on many virtual access point association accesses according to claim 1, it is characterized in that, when publish/subscribe mechanism, when publish/subscribe mechanism taked by SDN controller, all AP are in listen mode, for the radio frames of perception client, obtain its RSSI.
3. the WLAN (wireless local area network) motion management method based on many virtual access point association accesses according to claim 1 and 2, it is characterized in that, described lightweight soft virtual access point LSVAP is the information record of an abstract mobile terminal and physics AP incidence relation, for completing client wireless access, mainly comprise: the MAC Address of terminal, the IP address of terminal, the virtual basic service sets home address BSSID that controller distributes, the network name SSID of terminal access, and OpenFlow flow rule.
4. the WLAN (wireless local area network) motion management method based on many virtual access point association accesses according to claim 3, is characterized in that, take self-defining handle to carry out information transmission, comprise add_lsvap, remove_lsvap between control end and AP.
5. the WLAN (wireless local area network) motion management method based on many virtual access point association accesses according to claim 4, it is characterized in that, signal strength threshold value HTresRSSI is set to-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 |
| CN107979877A (en) * | 2016-10-25 | 2018-05-01 | 华为技术有限公司 | Associate method, equipment and the central access point of WLAN |
| 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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Cited By (5)
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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 |
| CN107979877A (en) * | 2016-10-25 | 2018-05-01 | 华为技术有限公司 | Associate method, equipment and the central access point of WLAN |
| 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 |
| US11019558B2 (en) | 2016-10-25 | 2021-05-25 | Huawei Technologies Co., Ltd. | Wireless local area network association method and device, and central access point |
| 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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| CN105430700B (en) | 2018-10-12 |
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