CN104066207A - 802.11 wireless access network based on virtualization technology - Google Patents

802.11 wireless access network based on virtualization technology Download PDF

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CN104066207A
CN104066207A CN201410238355.4A CN201410238355A CN104066207A CN 104066207 A CN104066207 A CN 104066207A CN 201410238355 A CN201410238355 A CN 201410238355A CN 104066207 A CN104066207 A CN 104066207A
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access point
tunnel
virtual
wireless
physical
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CN104066207B (en
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彭家亮
张宏纲
赵志峰
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The invention discloses an 802.11 wireless access network based on a virtualization technology. The 802.11 wireless access network comprises a virtual access point and more than two physical access points, wherein the virtual access point comprises a virtualized wireless network card capable of generating a 802.11 data frame, a first channel for encapsulating the 802.11 data frame, and a virtual switch; the virtualized wireless network card is connected with the virtual switch through the first channel; each physical access point comprises a wired network card, a wireless network card and a second channel for encapsulating the 802.11 data frame; each wired network card is connected with each wireless network card through each second channel; the virtual switch is connected with the wired network card in each physical access point respectively in a wired way. By adopting the 802.11 wireless access network, seamless switching among the physical wireless access points can be realized, and the problem of wireless local area network signal coverage in medium and small ranges is effectively solved. Moreover, an open virtual switch standard switch and a software definition network controller are used, thereby simplifying the network topology, realizing uniform management and monitoring of planned configuration and laying a basis for whole network optimization.

Description

A kind of 802.11 wireless access networks based on Intel Virtualization Technology
Technical field
The present invention relates to network virtualization technology and wireless access network, belong to mobile communication technology field.
Background technology
Along with reaching its maturity and fast development of wireless communication technology, the explosive growth of use amount of the mobile devices such as smart mobile phone, panel computer, people more and more rely on mobile internet device, and the mobility demand of wireless lan (wlan) is more and more stronger.More and more extensive along with WLAN application, increasing WAP (wireless access point) is deployed for meeting people's demand.Traditional WAP (wireless access point) is all independently not controlled conventionally.This design set pattern is substituted gradually, the WAP (wireless access point) function that gets more and more, diversification.Because the area coverage of single WAP (wireless access point) is limited, a lot of situations need to adopt the wireless access network of multi-access point.
The structure that tradition multi-access point wireless access network be same extended service set, realizes a plurality of WAP (wireless access point) roamings, and in radio roaming network, client configuration is identical with the configuration in access point network like this, user in the process of movement without manual switchover.But this mode can not realize seamless link, and handoff procedure expends the plenty of time, and user experiences poor, revise configuration inconvenient, cannot manage and dispose by collector, can not well adapt to the demand of indoor wireless networks.
Present stage, enterprise-level wireless access network adopted the scheme of " wireless exchange board+thin WAP (wireless access point) " conventionally, the object of this scheme, and in order to solve, original WAP (wireless access point) product cannot be managed concentratedly and the deficiency of concentrated deployment secure strategy exactly.In this cover solution framework, by three parts, formed, be respectively thin WAP (wireless access point), wireless controller, wireless network management platform.This mode safety is effective, and high but shortcoming is cost, complexity is high, needs professional webmaster to be configured product, and Ge Jia producer product exists technology barriers, and product must support the use, and is not therefore suitable for the network topologies flexibly such as Smart Home.
Current, Intel Virtualization Technology has become the important means that promotes cluster performance, raising utilization ratio, the total cost of ownership that reduces, enhancing system flexibility.And network virtualization is to use abstract based on software, a kind of mode of separated network flow from physical network element.Wherein " many empty one " technology is exactly a plurality of independently physical locations virtual to be a logical block, a plurality of unit are cooperated mutually, process same task.Its main purpose is for extended resources, increases the capacity of network node.Also play simplified network topology simultaneously, be easy to management, strengthen the effect of network reliability.
Open virtual switch standard switchboard (Open vSwitch) is subject to industry extensive concern, and its target is to realize a multilayer virtual switch with Product-level quality.By expansion able to programme, the automation that can realize large scale network configures, administers and maintains.It supports existing standard management interface and agreement, as netFlow, and sFlow, SPAN, RSPAN, CLI, LACP, 802.1ag etc.
Software defined network (Software-defined Networking), a kind of new network innovation framework that seminar of Shi You Stanford Univ USA proposes, its core technology OpenFlow is by separating the chain of command of the network equipment and data surface, thereby to network design planning and management, provide great flexibility, for the innovation of core network and application provides good platform.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, propose a kind of 802.11 wireless access networks based on Intel Virtualization Technology, thereby overcome all or part of defect of prior art.
The present invention realizes the technical scheme that its object takes: 802.11 wireless access networks that the present invention is based on Intel Virtualization Technology comprise a virtual access point and two above physical access point, and described virtual access point comprises can produce the virtual wireless network card of 802.11 Frames, for encapsulating the first tunnel and the virtual switch of 802.11 Frames; Virtual radio network interface card is connected with described virtual switch by described the first tunnel; Described in each, physical access point comprises wired network adapter, wireless network card and for encapsulating the second tunnel of 802.11 Frames, described wired network adapter is connected with described wireless network card by described the second tunnel, and described virtual switch is connected with the described wired network adapter in each physical access point respectively by wired mode.
Further, virtual switch of the present invention is open virtual switch standard switchboard.
Further, the present invention also comprises software defined network controller, and described software defined network controller is connected with described virtual switch.
Further, the first tunnel of the present invention comprises tunnel encapsulation table; On the one hand, when the first tunnel receives the packet from new mobile terminal first by physical access point, the ethernet data frame deblocking of self-virtualizing switch becomes 802.11 Frames and extracts relevant information in the future, described " relevant information " comprises IP address and the physical address of physical access point and physical address and the signal strength signal intensity that sends the new mobile terminal of this packet, and described tunnel encapsulation table carries out associated record according to extracted relevant information by this new mobile terminal and the physical access point that receives the packet of this mobile terminal; If the first tunnel receives, it not the packet of new mobile terminal, whether the mobile terminal that the first tunnel sends this packet according to original associated record judgement of its tunnel encapsulation table is associated with the physical access point of receiving this packet, if be associated, the first tunnel by the Packet Generation from mobile terminal to virtual radio network interface card; If unconnected, abandon this packet; On the other hand, when the first tunnel receives 802.11 Frame of virtual radio network interface card generation, extract the frame header information of 802.11 Frames, and according to original associated record of this frame header information and described tunnel encapsulation table, determine the associated physical access point of object mobile terminal of this 802.11 Frame, and using the IP address of this physical access point and physical address and encapsulate this 802.11 Frame as object IP address and the object physical address of capsule header, and then 802.11 Frames after encapsulation are sent to virtual switch.
Compared with prior art, the invention has the beneficial effects as follows: the present invention by two above physical access point virtual be a virtual access point, realize that 802.11 WAP (wireless access point) " many empty " are virtual, the virtual unified management of multi-access point, the mobile terminal function such as seamless switching between multi-access point.If virtual switch further adopts open virtual switch standard switchboard, and be connected with software defined network controller, software defined network controller can also be controlled the data stream list of 802.11 wireless access networks, realize the flexible control of network traffics, can effectively facilitate management and configuration wireless access network; By the open platform on controller, write various application, can realize multiple network configuration feature, as detected flow situation in dynamic virtual environment of mobile terminal and access point, the service quality of fine granularity, traffic policy load balancing, the monitoring of dynamic real-time stream amount, fire compartment wall, gateway and the wireless link monitoring etc. based on port.Thereby, wireless access network of the present invention is supported different application scenarioss, realization from 802.11 radio interface layers to network interface layer, each layer of cross-layer network virtualization such as internetwork layer, transport layer, realize the fully virtualized configuration of network, simplified network topology, facilitate unified management planning, can provide basis for network-wide optimization.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the schematic layout pattern of a practical application of the present invention.
Embodiment
As shown in Figure 1,802.11 wireless access networks that the present invention is based on Intel Virtualization Technology comprise a virtual access point and two above physical access point.Wherein, virtual access point comprise can produce the virtual wireless network card of 802.11 Frames, for encapsulating the first tunnel and the virtual switch of 802.11 Frames; Virtual radio network interface card is connected with virtual switch by described the first tunnel.Each physical access point comprises wired network adapter, wireless network card and for encapsulating the second tunnel of 802.11 Frames.In each physical access point, wired network adapter is connected with wireless network card by the second tunnel, and virtual switch is connected with the wired network adapter in each physical access point respectively by wired mode.Implementation and the function of each several part are described respectively with specific embodiment below.
1. virtual access point
As shown in Figure 1, virtual access point comprise can produce the virtual wireless network card of 802.11 Frames, for encapsulating the first tunnel and the virtual switch of 802.11 Frames.The carrier of virtual access point can be the electronic equipments such as computer, switch, router.On virtual access point, by software virtual, go out 802.11 virtual radio network interface cards, and the channel of configuration virtual wireless network card, service set number, authentication mode, access point mode of operation etc., can receive and send 802.11 Frames.Virtual switch is to realize a virtual switch by Intel Virtualization Technology, is used for bridge joint physical interface, can bind several Ethernet interfaces, thereby their bridge joints are got up.The first tunnel that encapsulates 802.11 Frames adopts usings 802.11 Frames as the tunnel encapsulation technology of load, as being the three layer tunnel of 802.11MAC_over_IP or the two layer tunnel encapsulation of 802.11MAC_over_MAC etc.The one end in the first tunnel connects the virtual radio network interface card of virtual access point, and the other end connects virtual switch.
On the one hand, when the first tunnel receives the packet from new mobile terminal first by physical access point, the ethernet data frame deblocking of self-virtualizing switch becomes 802.11 Frames and extracts relevant information in the future, described " relevant information " comprises IP address and the physical address of physical access point and physical address and the signal strength signal intensity that sends the new mobile terminal of this packet, and described tunnel encapsulation table carries out associated record according to extracted relevant information by this new mobile terminal and the physical access point that receives the packet of this mobile terminal; If the first tunnel receives, it not the packet of new mobile terminal, whether the mobile terminal that the first tunnel sends this packet according to original associated record judgement of its tunnel encapsulation table is associated with the physical access point of receiving this packet, if be associated, the first tunnel by the Packet Generation from mobile terminal to virtual radio network interface card; If unconnected, abandon this packet; On the other hand, when the first tunnel receives 802.11 Frame of virtual radio network interface card generation, extract the frame header information of 802.11 Frames, and according to original associated record of this frame header information and described tunnel encapsulation table, determine the associated physical access point of object mobile terminal of this 802.11 Frame, and using the IP address of this physical access point and physical address and encapsulate this 802.11 Frame as object IP address and the object physical address of capsule header, and then 802.11 Frames after encapsulation are sent to virtual switch.Virtual switch is transmitted by checking self, and this Frame is forwarded to corresponding physical access point.
2. physical access point
As shown in Figure 1, each physical access point comprises respectively wired network adapter, wireless network card and for encapsulating the second tunnel of 802.11 Frames.In each physical access point, wired network adapter is connected with wireless network card by the second tunnel.The virtual switch of virtual access point is connected with the wired network adapter in each physical access point by wired mode.The wireless network card of each physical access point is all operated in monitoring mode, and the working frequency range of wireless network card is identical with the working frequency range of the Microsoft Loopback Adapter of virtual access point, receives 802.11 all wireless data frame under interior this frequency range of coverage.The wireless network card of each physical access point disposes a wave point, when a mobile terminal sends 802.11 Frames after the wireless network card of physical access point, wave point sends 802.11 real-time confirmation frames to mobile terminal by wireless network card, shows that WAP (wireless access point) received this frame.The second tunnel that encapsulates 802.11 Frames adopts usings 802.11 Frames as the tunnel encapsulation technology of load, such as thinking the three layer tunnel encapsulation technology of 802.11MAC_over_IP or the two layer tunnel encapsulation technology of 802.11MAC_over_MAC etc.The one end in the second tunnel connects wireless network card, and the other end connects wired network adapter.When wireless network card receives after 802.11 packets, send to the second tunnel of encapsulation 802.11 Frames, the second tunnel carries out filter operation according to the relevant information of virtual access point to 802.11 Frames that receive, the Frame that does not belong to this virtual access point is abandoned, reduce unnecessary network spending.802.11 Frames after filtration, in the second tunnel, packed Ethernet data bag, sends to wired network adapter, and sends to virtual access point by wired mode.The packet from virtual access point that wired network adapter is received, directly be forwarded to the second tunnel, the packet solution that wired network adapter is sent in the second tunnel is packaged into 802.11 packets, is transmitted to wireless network card, and wireless network card sends to mobile terminal 802.11 Frames.
In the present invention, because authentication and the association status of the IEEE802.11 of mobile terminal is only kept in virtual access point, so when moving in the signal cover of mobile terminal in physical access point, only trigger flow switch between physical access point, do not triggered 802.11 standard switching flow.For mobile terminal, associated WAP (wireless access point) is virtual access point, and 802.11 standard switching does not occur in the switching of mobile terminal between physical access point.Therefore, the flow switch process between physical access point, is transparent for mobile terminal, and the switching of mobile terminal between physical access point can't cause the interruption of network service.Specifically describe handoff procedure below.
Referring to Fig. 1, when mobile terminal is when a physical access point 1 moves to another physical access point 2, the signal strength signal intensity of this mobile terminal that physical access point 1 detects constantly weakens, and the signal strength signal intensity of this mobile terminal that physical access point 2 detects constantly strengthens.The information such as signal strength signal intensity of this access point that physical access point detects are included in 802.11 Radiotap frame header of 802.11 Frames.802.11 Frames that send when mobile terminal are through the encapsulation in the second tunnel of physical access point, send to behind the first tunnel of virtual access point, the first tunnel extracts the information such as signal strength signal intensity in 802.11 Radiotap frame header, and is recorded in self tunnel encapsulation table.Virtual access point carries out real-time size comparison by the signal strength signal intensity between each physical access point and this mobile terminal, thereby the flow switch carrying out between physical access point is controlled automatically.When physical access point 2 detects the signal strength signal intensity of certain terminal associated with physical access point 1 and the difference of the signal strength signal intensity that physical access point 1 detects reaches predefined threshold value Signal tHafter, trigger the handoff procedure between physical access point.Trigger the threshold value Signal of the difference in signal strength of handoff procedure tH, rule of thumb its default value is 50dBm, technical staff can adjust voluntarily according to the demand of switching sensitivity the threshold value of difference in signal strength.Because the incidence relation of mobile terminal and physical radio access point is determined by the first tunnel, communication path between virtual access point and mobile terminal is selected by the first tunnel, so completing the switching of mobile terminal between physical access point, the first tunnel only the associated physical access point of this mobile terminal need be made into physical access point 2 by physical access point 1, the flow of this mobile terminal is just transferred to physical access point 2 from physical radio access point 1 like this, completes handoff procedure.This handoff procedure is transparent for mobile terminal.This handoff procedure can be applied in different scenes, such as flow equalization and mobile management etc.In addition, the first tunnel can be by closing the tunnel passage of certain physical access point, and the packet that virtual radio network interface card is produced cannot arrive physical access point, reduces physical access point transmitting power consumption and reduce the interference to spacing wireless frequency spectrum resource.
Fig. 2 is the schematic layout pattern of a practical application of the present invention.Consider that indoor wireless channels fading effect and indoor wall are to the stopping of wireless channel, can in each needs the room of wireless access, respectively place a physical access point, and place in doors a virtual access point.When layout, the signal cover that technical staff should each physical access point of reasonable disposition, is limited in each room the signal coverage areas of physical access point, guarantees that the signal cover of each physical access point is not overlapping as far as possible.Due to when the area of coverage overlapping region of terminal in contiguous physical radio access point, can receive the signal of the physical radio access point in coverage of living in simultaneously, therefore when contiguous physical access point has packets need to send simultaneously, due to signal collision, the communication quality of terminal can decline.The present invention can be limited in certain scope the signal cover between each physical access point by limiting the transmitting power of each physical access point, can effectively reduce the problem in signal overlap region.The present invention can meet the wireless access demand in the indoor places such as family and hotel, can realize transparent seamless switching, and coverage can have very large flexibility.As mobile subscriber moves to the room at physical access point 2 places from the room at physical access point 1 place, can detect signal between user and physical access point 1 more and more a little less than, and between physical access point 2, signal is more and more stronger, when the latter exceeds after certain thresholding than the former, carry out the switching between physical access point rapidly, the associated physical access point of terminal is switched to physical access point 2 from physical access point 1.Mobile terminal can not perceive handoff procedure, realizes the seamless switching of terminal between physical access point, makes user have better experience.
Virtual switch can be the Hyper-V of Microsoft virtual switch, the Nexus of Cisco 1000, linux kernel bridge joint and open virtual switch standard switchboard (Open vSwitch).Wherein preferably use open virtual switch standard switchboard, open virtual switch standard switchboard is the multilayer virtual exchange standard switch of the Product-level quality under the Apache2.0 license of increasing income.It can be expanded by programming, makes network realize automation configuration, administer and maintain, and also supports management interface and the agreement (as NetFlow, sFlow, SPAN, RSPAN, CLI, LACP, 802.1ag, OpenFlow etc.) of standard simultaneously.
What the virtual switch in the present invention was used is while opening virtual switch standard switchboard (Open vSwitch), open virtual switch standard switchboard can be connected with software defined network (Software-defined Networking) controller, make the present invention can realize software defined network management.Software defined network controller can be the controller that Floodlight, Open Daylight, NOX, POX etc. support OpenFlow agreement.Software defined network controller can be controlled the stream list item of open virtual switch standard switchboard by OpenFlow agreement, make network traffics obtain management and control.By the open interface platform on software defined network controller, technical staff can write various open applications and realize multiple network configuration feature, as various custom features such as load balancing, network service quality assurance, flow monitoring, fire compartment wall, gateway, DHCP, wireless link monitorings.Therefore the open applications on software defined network controller can be carried out dynamic control and management to the stream table of open virtual switch standard switchboard, thereby make wireless access network of the present invention adapt to different application scenarioss, realize from 802.11 radio interface layers to network interface layer, the multilayer cross-layer network virtualization such as internetwork layer, transport layer.Similarly, software defined network controller can obtain the real-time topology information of the whole network, and controller can dynamically be adjusted the configuration of network, do not need manual intervention, realize the fully virtualized automation configuration of network, unified management planning, can provide basis for network-wide optimization.

Claims (4)

1. 802.11 wireless access networks based on Intel Virtualization Technology, it is characterized in that: comprise the above physical access point of a virtual access point and two, described virtual access point comprises can produce the virtual wireless network card of 802.11 Frames, for encapsulating the first tunnel and the virtual switch of 802.11 Frames; Virtual radio network interface card is connected with described virtual switch by described the first tunnel; Described in each, physical access point comprises wired network adapter, wireless network card and for encapsulating the second tunnel of 802.11 Frames, described wired network adapter is connected with described wireless network card by described the second tunnel, and described virtual switch is connected with the described wired network adapter in each physical access point respectively by wired mode.
2. 802.11 wireless access networks based on Intel Virtualization Technology according to claim 1, is characterized in that: described virtual switch is open virtual switch standard switchboard.
3. 802.11 wireless access networks based on Intel Virtualization Technology according to claim 2, is characterized in that: also comprise software defined network controller, described software defined network controller is connected with described virtual switch.
4. according to 802.11 wireless access networks based on Intel Virtualization Technology described in any one in claims 1 to 3, it is characterized in that: described the first tunnel comprises tunnel encapsulation table; On the one hand, when the first tunnel receives the packet from new mobile terminal first by physical access point, the ethernet data frame deblocking of self-virtualizing switch becomes 802.11 Frames and extracts relevant information in the future, described " relevant information " comprises IP address and the physical address of physical access point and physical address and the signal strength signal intensity that sends the new mobile terminal of this packet, and described tunnel encapsulation table carries out associated record according to extracted relevant information by this new mobile terminal and the physical access point that receives the packet of this mobile terminal; If the first tunnel receives, it not the packet of new mobile terminal, whether the mobile terminal that the first tunnel sends this packet according to original associated record judgement of its tunnel encapsulation table is associated with the physical access point of receiving this packet, if be associated, the first tunnel by the Packet Generation from mobile terminal to virtual radio network interface card; If unconnected, abandon this packet; On the other hand, when the first tunnel receives 802.11 Frame of virtual radio network interface card generation, extract the frame header information of 802.11 Frames, and according to original associated record of this frame header information and described tunnel encapsulation table, determine the associated physical access point of object mobile terminal of this 802.11 Frame, and using the IP address of this physical access point and physical address and encapsulate this 802.11 Frame as object IP address and the object physical address of capsule header, and then 802.11 Frames after encapsulation are sent to virtual switch.
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