CN103179581A - Wireless control plane handling in a split plane deployment - Google Patents

Abstract

The invention relates to wireless control plane handling in a split plane deployment. A method, an apparatus and a computer program product for providing a wireless control plane failover handling in a split-plane deployment are presented. A first AP in a split-plane deployment detects failure of a Wireless Control Plane (WCP) device. The First AP hides an SSW in beacons broadcast by the first AP, The first AP stores information for existing Mobile Units (MUs) that dissociate after the detection of the failure of the WCP device. The first AP will respond to probes from existing MUs and also respond to probes from MUs that have their information stored in the AP, such that the first AP appears hidden from new MUs while being exposed to existing MUs.

Description

Controlled in wireless plane fault during segmentation plane is disposed is controlled

Background technology

It is omnipresent that wireless network has become.Wireless network refers to wireless and usually and the computer network of any type of being associated of communication network (in communication network, can in the situation that do not use electric wire to realize interconnection between each node).Radio telecommunication network is generally utilize to use the long haul information transfer architecture of some types that electromagnetic wave (for example radio wave) carries to realize, therefore this realization usually occurs in physical layer or network layer.

Typical wireless network can comprise one or more access points (AP), one or more wireless controller (WC) and one or more mobile unit (MU).MU can comprise laptop computer, mobile phone, personal digital assistant (PDA) etc.

WLAN (wireless local area network) (LAN) is to make a plurality of " mobile unit " user (MU) can intercom mutually, access a kind of popular and cheap mode of cable LAN, access home server, access remote server (such as by the Internet etc.) etc.WLAN (wireless local area network) (WLAN) generally includes access point (AP) and one or more mobile unit.

Wireless aps is to allow radio communication device to be connected to the device of wireless network.Access point allows radio mobile unit intercom mutually and communicate with the infrastructure that is connected to AP.

Server is used for providing the service such as access application (for example, e-mail system, word processing program, accounting system and/or private database) and so on.WLAN is used in facility such as enterprise, university classroom or building, lounge, airport, hotel meeting room etc.In the time of near the user is positioned at access point physically, transceiver and the access point of mobile unit communicate, and are established thereby make with being connected of WLAN.

AP and mobile unit by the communication channel shared take frame as the unit the transmission of data.The frame that transfers to AP from mobile unit is called as uplink frame, and is called as descending chain circuit frame from the frame that AP transfers to mobile unit.In the situation that two or more mobile units (perhaps AP and mobile unit) transmission frame simultaneously, one or more frame might be damaged (referred to herein as conflict).Therefore, WLAN (wireless local area network) (WLAN) adopts one or more agreements to guarantee that mobile unit or AP can obtain the exclusive access of shared communication channel is reached the predetermined time interval usually, in order in the situation that do not clash its frame of transmission.

Some wireless network protocol (for example, Institute of Electrical and Electric Engineers [IEEE] 802.11 etc.) regulation, AP broadcasts the special frames that is called as beacon that can be listened to by the mobile unit in BSA (primary service area, that is, the zone that AP covers) termly.Beacon comprises various information, these information make the mobile unit can be in an orderly way (for example, timestamp) set up and keep communication, thereby make mobile unit synchronously its local clock and signaling information (for example, channel number, frequency hopping pattern, residence time etc.).

Wireless network can also comprise one or more VLANs (VLAN).VLAN comprises having one group of common device group that requires, and how these physical locations that install them all communicate just as being attached to identical broadcast domain.VLAN has the attribute identical with physics LAN, even but allow device in the situation that be not positioned on the identical network switch and also can be aggregated together.

When controlled in wireless plane (WCP) function was implemented in virtual or physical facilities in enterprise data center, segmentation plane was disposed the existing switching infrastructure facility parts of reusing customer site and is carried out wireless data and forward.The WCP function is responsible for configuration, control and the monitoring of wireless access medium.MU is related, authentication is controlled by WCP with releasing is related.Wireless switching surface (WSP) is carried out and is repeated but the action of jumbo data retransmission.

Because network interrupts and can frequently occur because of the fault in hardware or software or mismanagement, be the importance of network design so redundancy and fault shift.The keeper need to possess the ability of closing, move and restart virtual WCP application program according to the resource requirement in data center.Wireless network in the situation that these transition periods in the ability that does not affect the wireless user and operate, be very crucial for the success of segmentation plane architecture.

The most frequently used deployment model is the covering scheme, and wherein WCP and WSP function are integrated in the single assembly that is called as wireless controller (WC).In the case, the fault that is connected between AP and WC can be to controlling and data retransmission both exert an influence.

Summary of the invention

Conventional mechanism as above has number of drawbacks.In the segmentation plane architecture, the fault of WCP can not affect wireless data and forward.This allows AP to continue as the MU that is associated the data retransmission service is provided, and this is in one of advantage that is described to the segmentation plane architecture in the past.Another business industry ﹠ solution that solves redundancy issue is that the WCP function is transferred in AP, and wherein most of function is to carry out in AP, and controller only carries out configuration and monitoring, and this does not affect the normal running of wireless access.This is a kind of diverse architecture, and is popular for disposing on a small scale, but along with the increase of AP number can not be regulated scale well in proportion.In general, the WCP function is computation-intensive, and these functions can regulate scale well in proportion when being concentrated on powerful CPU, and the WSP function can be regulated scale well in proportion when decentralized simultaneously.This benefit only has from the segmentation plane architecture and just can obtain.

Shift for fault the current solution that proposes and do not solve issuable problem between failover period fully.This problem is vital for the feasibility of the following theory that proposes: AP can in the situation that do not rebulid with the segmentation plane model in being connected of WCP equipment continuing forwarding data and reach the long period.This problem be because AP can't access the WCP function to support for the related of the MU of new or roaming it by 802.11 beacons with continue to report it for probe response new or MU roaming and be present in wireless environment and occur.The time that is in this state along with AP is more and more longer, and increasing MU begins to experience wireless service to interrupt.

Present solution has increased the problem of deployment aspect, and wherein the honeycomb redundancy is carried out intelligent load-balancing to AP and is placed in deployment by crossing over WCP.In this scheme, popularly in cover disposing be that the adjacent AP in the RF territory is assigned to alternative WCP device.Thereby, when WCP equipment breaks down, there is all the time certain AP that is connected and provides for MU complete WCP function that keeps with the WCP that works in the given physical location of enterprise.In cover disposing, the honeycomb redundancy provides faster to be recovered, in case because AP has detected the disappearance that is connected with WC, it just closes radio and MU can roam into the adjacent AP that wireless radio service still is provided immediately.In segmentation plane is disposed, ignored fully during the problem of the solution of discussing aspect solving not damaged data forwarding and closed the advantage of radio to recover to cover.

Embodiments of the invention have significantly overcome these defectives and following mechanism and technology are provided, these mechanism and technology provide the segmentation plane failover mechanisms, thereby make the advantage that the MU that there is no roaming between failover period is kept the segmentation plane architecture, still allow simultaneously the MU of roaming to receive service in the wireless network that is designed with the honeycomb redundancy.Mechanism described in the present invention can allow affected AP in the situation that need not to access fully the long duration of WCP function operation.

In the specific embodiment of the method for controlling on the controlled in wireless plane that is used for providing segmentation plane to dispose, the method comprises: the first access point (AP) in disposing by segmentation plane detects the fault that install on controlled in wireless plane (WCP).The method further comprises the SSID that hides by the AP in the beacon of an AP broadcasting, and in will being stored in the high-speed cache of an AP in the information of the existing mobile unit (MU) of disassociation after the fault that the WCP device detected.In addition, the method comprises responding and the detection from the MU with the information in high-speed cache is responded from the detection that has MU now, is hidden thereby make an AP show as new MU when being exposed to existing MU.

Other embodiment comprises the computer-readable medium that has computer-readable code on it, and this computer scale code is used for providing segmentation plane disposes controlled in wireless plane to control (handling).Computer-readable medium comprises the instruction that detects the fault of controlled in wireless plane (WCP) device for the first access point (AP) of disposing by segmentation plane.Computer-readable medium further comprises for hiding by the instruction of the SSID of an AP of the beacon of an AP broadcasting and being used for being stored in the information of the existing mobile unit (MU) of disassociation after the fault that the WCP device detected the instruction of the high-speed cache of an AP.In addition, computer-readable medium comprises the instruction that responds for to the detection from existing MU, instruction with being used for the detection from the MU of the information with high-speed cache is responded is hidden thereby make an AP show as new MU when being exposed to existing MU.

Other embodiment in addition comprises computerized device, and described computerized device is configured to process as embodiments of the invention and operates in all methods disclosed herein.In these embodiments, computerized device (for example, AP) comprising: storage system, processor and connect communication interface in the interconnection mechanism of these parts.This storage system is encoded with following processing, as illustrated in this paper, this processing provides the controlled in wireless plane of segmentation plane in disposing to control, this processing is (for example when carrying out) when being performed on processor, as illustrated in this paper, move to carry out as embodiments of the invention illustrated in this article all embodiments of the method and operation in AP.Therefore, any computerized device of carrying out or be programmed to carry out the illustrated processing of this paper is embodiments of the invention.

Other layout of embodiments of the invention disclosed herein comprises software program, and described software program be used for to be carried out above that sum up and in following detailed disclosed embodiment of the method step and operation.More specifically, computer program is an embodiment with computer-readable medium, computer-readable medium comprises coding computer program logic thereon, this computer program logic provides the operation that is associated when being performed in computerized device, as described herein, described operation provides the controlled in wireless plane of segmentation plane in disposing to control.Described computer program logic makes processor carry out the operation (for example, method) of pointing out in this article as embodiments of the invention when being performed at least one processor with computing system.This layout of the present invention at computer-readable medium (for example is provided as usually, optical medium (for example, CD-ROM), floppy disk or hard disk or other medium) upper software, code and/or other data structure that arranges or encode, for example, firmware or microcode in one or more ROM or RAM or PROM chip perhaps are provided as application-specific integrated circuit (ASIC) (ASIC) or are provided as downloadable software image in one or more modules, shared library etc.Software or firmware or other this configuration can be installed in computerized device, the illustrated technology in this article so that the one or more processors in computerized device are carried out as embodiments of the invention.The software of (for example, in one group of data communication equipment or other entity) operation is processed and also can be provided system of the present invention in one group of computerized device.System of the present invention can be distributed between many softwares on some data communication equipments process, and perhaps all processing can or move on a computer separately in operation on a small group special-purpose computer.

It should be understood that embodiments of the invention can strictly be embodied as software program in data communication equipment for example, software and hardware or only hardware and/or circuit.The illustrated feature of the present invention of this paper can be used in data communication equipment and/or be used in (being for example Basking Ridge by the address, the Avaya of New Jersey, the Inc. manufacturing) software systems of this device.

Note, the feature that each that discuss in the disclosure is different, technology, configuration etc. can be carried out independently or in combination.Therefore, the present invention can implement and treat by many different modes.In addition, notice that summary of the invention part does not herein illustrate each embodiment of the disclosure or described invention and/or the novel aspect of increase.On the contrary, summary of the invention only provides the preliminary discussion to different embodiment and the corresponding novel point compared with routine techniques.In order to obtain other details of the present invention, element and/or possible viewpoint (displacement), embodiment part and the respective drawings of the present disclosure further discussed below the reader should forward to.

Description of drawings

According to following more specific description to the preferred embodiment of the present invention, it is clear that aforementioned content will become, and as shown in the drawing, wherein similar Reference numeral refers to identical parts in all different views.These accompanying drawings needn't be drawn in proportion, and it focuses on explanation principle of the present invention on the contrary.

Fig. 1 is the block diagram of describing the overlay model deployment (overlay model deployment) of prior art;

Fig. 2 describes the block diagram that the prior art of fault has occured wireless controller wherein overlay model is disposed;

Fig. 3 describes access point wherein to have closed the block diagram that the overlay model of its wireless prior art is disposed;

Fig. 4 is provided by the block diagram that access point wherein is associated with another wireless controller and begins to provide the overlay model of the prior art of radio frequency (RF) service to dispose;

Fig. 5 is the block diagram of describing the segmentation plane model deployment of prior art;

Fig. 6 describes the block diagram that the prior art of fault has occured controlled in wireless plane device wherein segmentation plane model is disposed;

Fig. 7 describes wireless switching surface device wherein search for another controlled in wireless plane device but continue as the block diagram that the segmentation plane model of the prior art of AP forwarding data communication is disposed.Thereby lost the MU that continues to utilize radio to operate as being associated with the AP that is connected of WCP service is provided.Yet new MU can not obtain service, does not connect to complete association for new MU because AP does not have WCP;

Fig. 8 describes the block diagram that wherein wireless switching surface device and AP have been associated with another WCP and have recovered to dispose for the segmentation plane model of the prior art of the full service of all MU;

Fig. 9 is illustrated in to cover the block diagram that uses the honeycomb redundancy in deployment;

Figure 10 is illustrated in the block diagram that the honeycomb redundancy is used in fault has occured wireless controller wherein covering in disposing;

Figure 11 is illustrated in the block diagram that the honeycomb redundancy is used in fault has occured wireless controller wherein covering in disposing, wherein the AP by WC management closes radio, and affected MU roams into and is connected with another WC and reports the neighboring access point that the WLAN in the RF territory serves;

Figure 12 is illustrated in the block diagram that uses the honeycomb redundancy in the segmentation plane deployment;

Figure 13 is illustrated in the block diagram that uses the honeycomb redundancy in the segmentation plane deployment that wherein the controlled in wireless plane device has broken down;

Figure 14 be illustrated in that controlled in wireless plane device has wherein broken down and new client not have to receive be not the block diagram of use honeycomb redundancy in being disposed by the segmentation plane of the service in the AP residential quarter of any WCP management;

The flow chart of the specific embodiment of the method for controlling is provided for the controlled in wireless plane fault that provides segmentation plane to dispose for Figure 15 A and Figure 15 B; And

The flow chart of the specific embodiment of the method for controlling is provided for the controlled in wireless plane fault that provides the segmentation plane of wherein having used wireless data service (WDS) link to dispose Figure 16.

Embodiment

The embodiment that the below proposes represents to make those skilled in the art can implement necessary information of the present invention and shows the best mode of implementing the embodiment of the present invention.After explanation below the reference accompanying drawing is read, it will be appreciated by those skilled in the art that concept of the present invention and recognize the application of these concepts of specifically not mentioning in this article.Should be understood that, these concepts and application fall in the scope of the disclosure and the accompanying claims.

Covering architectural model is the wireless network deployment model of commonly using.In the case, controlled in wireless plane (WCP) and wireless switching surface (WSP) are on the same apparatus that is called as wireless controller (WC).With reference to Fig. 1, show the covering architectural model.In this example, the first building comprises the first wireless controller WC1.Solid lines represent data tunnel between device, the dotted line of light color represents control channel, the data communication on more dark dotted line representative data tunnel.Set up control channel respectively between WC1 and AP1, AP2 and AP3.And set up control channel respectively between WC2 and AP4, AP5 and WC1.Set up data tunnel respectively between WC1 and AP1, AP2 and AP3.Set up data tunnel respectively between WC2 and AP4, AP5 and WC1.Data communication MU1 and MU2 has occured to WC2, from WC2 to AP4 and from AP4 to MU2 by the L2/L3 cloud from MU1 to AP1, from AP1 to WC1, from WC1.

Referring now to Fig. 2, WC2 breaks down.Because WC2 breaks down, so controlled in wireless and wireless handoff functionality are both all no longer worked.The MU1-MU2 connection is interrupted.Sometimes after physical fault, AP4 and AP5 detect the fault of WC2.As shown in Figure 3, AP4 and AP5 close its radio.Because the radio in its RF neighborhood is closed, so MU2 is disengaged association.AP4 and AP5 another wireless controller in mobile domains that tries to find out.As shown in Figure 4, AP4 and AP5 find the data tunnel of WC1 and foundation and WC1.AP4 and AP5 also set up the control channel with newfound WC1.Then, AP4 and AP5 open its radio and the RF service are provided.Then, MU2 can again be associated with wireless network and can rebulid and the communicating by letter of MU1.

To shown in Figure 4, WCP and WSP break down simultaneously as Fig. 2.AP detects fault with certain delay, yet the data flow that is used for MU on AP is interrupted immediately.AP closes radio after WCP and WSP fault being detected, make the MU disassociation.AP finds another WCP and WSP device, and control and the data tunnel of foundation and this device.AP opens radio and again accepts MU.The data retransmission of MU has been interrupted the long duration.Many mobile wireless devices can not obtain to serve until the AP recovery is connected with the WSP device with WCP is connected.

The segmentation plane architecture is separated controlled in wireless plane (WCP) function and wireless switching surface (WSP) function.The WCP function can realize in virtual equipment or actual hardware.One of advantage of the segmentation plane deployment model that proposes is that it might allow WCP to break down, and does not affect existing customer's data retransmission.With reference to Fig. 5, show the segmentation plane architectural model.In this example, the first building comprises the first controlled in wireless plane device (WCP1).Set up corresponding control channel between WCP1 and AP1, AP2, AP3 and WSP1.And set up control channel between WCP2 and WCP1, AP4, AP5 and WSP2.Set up data tunnel respectively between WSP1 and AP1, AP2 and AP3.And set up data tunnel respectively between WSP2 and AP4, AP5 and WSP1.Data communication between MU1 and MU2 traverses to AP1, traverses to WSP1, traverses to WSP2, traverses to AP4 and traverse to MU2 from AP4 from WSP2 by the L2/L3 cloud from WSP1 from AP1 from MU1.

Referring now to Fig. 6, WCP2 breaks down.Even WCP2 breaks down, the MU1-MU2 connection is not interrupted yet.AP4 and AP5 can keep they and the data tunnel of WSP2 and the radio of not closing them.

As shown in Figure 7, WSP2 detects the fault of WCP2 and searches for another WCP device.AP4 and AP5 detect the fault of WCP2 and try to find out another WCP device.Between AP4 and WSP2 and the data tunnel between AP5 and WSP2 continue to keep and the carrying wireless data.Radio plot (radio cell) still can not be related the still new client of operation or roaming device (for example, MU3, MU4 or MU5), because association is the WCP function.Referring now to Fig. 8, WSP2 finds WCP1 and sets up with it control channel.AP4 and AP5 also set up corresponding control channel with WCP1.As a result, new or device (such as MU3, MU4 and/or MU5) roaming can obtain service now.

The honeycomb redundancy is by network design being become to make adjacent AP realized by different WCP management.The honeycomb redundancy can by the AP-WC load balancing algorithm realize and can guarantee in the situation that the WCP fault be not the building or floor in all AP all stop providing service.Referring now to Fig. 9, show the exemplary honeycomb redundancy that covers in disposing.AP1 has set up control channel and data tunnel with WC1, and MU1 is associated with AP1.The AP2 adjacent with AP3 with AP1 set up control channel and data tunnel with WC2.AP3 has set up control channel and data tunnel and MU2 with WC1 and has been associated with AP3.The AP4 adjacent with AP3 set up control channel and data tunnel with WC2.When breaking down, the data and the control channel that begin to end at the WC that breaks down from AP both all are affected as WC (for example, the WC1 in Figure 10).As shown in figure 11, the AP1 that before exists and the data tunnel between WC1 and control channel and the AP3 that exists before and the data tunnel between WC1 and control channel are interrupted.When WC1 breaks down, be affected immediately from MU1 and communicating by letter of MU2.AP1 and AP3 will close its radio when the fault of WC1 being detected.After AP1 and AP3 close radio, MU1 and MU2 will roam into the adjacent AP that continues to provide wireless service immediately.MU1 will set up network with AP2 and be connected, and MU2 will set up network with AP4 and be connected.

In the situation that the WC fault occurs, the honeycomb redundancy in covering provides than the recovery without wireless connections faster in the situation of honeycomb redundancy.AP is distributed to alternative WC also the WSP function is distributed to alternative WC.This is not in the situation in the best place (for example, WC is positioned at the building of separating on the geographical position) of seeing from the data retransmission angle at the WC that substitutes may not be desirable.

The honeycomb redundancy is used in and covers in deployment model, but its use in the segmentation plane model has been subjected to some challenges.With reference to Figure 12, show the network of having incorporated the honeycomb redundancy in segmentation plane is disposed into.

AP1 has set up control channel and has set up data tunnel with WSP1 with WCP1, and MU1 is associated with AP1.The AP2 adjacent with AP3 with AP1 set up control channel and set up data tunnel with WSP1 with WCP2.AP3 has set up with the control channel of WCP1 and has been associated with AP3 with data tunnel and the MU2 of WSP2.The AP4 adjacent with AP3 set up control channel and set up data tunnel with WSP2 with WCP2.WCP1 also has the control channel with WCP2 and WSP1.WCP2 has the control channel with WSP2.Also there is data tunnel between WSP1 and WSP2.MU1 communicates by AP1, WSP1, WSP2 and AP3 and MU2.In this environment, adjacent AP is by different WCP device managements.

As WCP (for example, the WCP1 in Figure 13) when breaking down, be interrupted with the control channel of this WCP.In the segmentation plane model, the MU data communication is unaffected.In segmentation plane was disposed, affected AP did not close radio.The new client who roams in affected AP residential quarter will experience the WLAN service disruption, because affected AP does not provide the access to the WCP function.If the existing customer in affected AP residential quarter temporarily roams in neighbor cell and returns, will be cut off connection.The segmentation plane failover mechanisms need to strengthen with the supporting cellular redundancy, because affected AP does not close radio.

Segmentation plane solution as herein described has avoided closing the radio on affected AP, thereby allows AP residential quarter maintenance to the WSP function of existing MU.Radio is stayed open, attracted new equipment to roam into affected AP.Owing to can not complete association on affected AP from the unavailable new equipment that causes of the WCP function of AP, so any device that newly roams in affected AP residential quarter will experience service disruption.For example, in Figure 14, MU3 can not complete related and will experience service disruption with MU4.

Be in the often roaming continually between the residential quarter of MU on the overlay region of two residential quarters.Therefore, some MU in affected AP residential quarter can roam back and forth.The mechanisms known that the roaming client provides the honeycomb redundancy and provides the segmentation plane of continual service to dispose for the fixed client in affected AP residential quarter is not provided.

The method and apparatus of controlling by the controlled in wireless plane of disposing for segmentation plane as herein described, when AP detected the fault of the WCP of segmentation plane in disposing, AP carried out following action.AP will hide the SSID that broadcasts in the AP beacon.SSID is the title of the wlan network that is associated with MU.After AP will further be buffered in the WCP event of failure will occur and AP set up with being connected of another WCP before the related information of MU of disassociation.AP only responds to the detection of the MU that is buffered from existing MU or from related information.When new MU roams near affected AP residential quarter, it can not detect from the SSID in the beacon of affected AP, because affected AP has hidden the SSID in the beacon.When new MU surveys on the channel of affected AP residential quarter, it will can not obtain any response from affected AP.Because new MU can not detect affected AP by active or drive sweep, so it will not attracted to this affected AP and will attempt only to connect for its visible AP.In the situation that the segmentation plane fault shifts, this mechanism is that new MU has kept the honeycomb redundancy.

When existing MU roams into adjacent AP, due to the honeycomb redundancy, it will obtain to connect on adjacent AP.When existing MU roams back affected AP, affected AP will be visible to this MU, because this MU will obtain the response for detection from affected AP.Affected AP can accept MU based on the information of former buffer memory.

In the deployment that is designed to have the honeycomb redundancy, affected AP might utilize the AP-AP wireless distribution system (WDPS) with adjacent AP to receive access to the WCP function.This can be used for the service of the WLAN on affected AP is extended to new MU.Should guarantee the safety to the access of WCP function, because it is used for postponing MU to the associated data of the sensitivity of WCP.Control channel between AP and WCP is encrypted.In order to make AP by obtaining secure access to the WCP function with the WDS link of adjacent AP, the WDS link also should be encrypted.For the WDS link safety, all AP WCP from turnover zone when setting up with being connected of WCP receives pre-shared encryption key.Should can and be pushed to all AP by periodic modification by the pre-encryption key of sharing.

AP reports WDS and serves to support for the access that loses with the WCP function of the adjacent AP that is connected of WCP in its RF neighborhood.When WCP breaks down, affected AP according to the present invention in foregoing mechanism continue as the existing customer service be provided.Affected AP stops at and reports the WDS service in its neighborhood, and simultaneously unaffected AP continues to report the WDS service.Affected AP also scans its RF neighborhood, to determine reporting any adjacent AP of WDS service.In case determined adjacent work AP, affected AP just sets up the interim WDS link with this work AP, thereby by the access of this work AP acquisition to the WCP function.When new MU was associated with affected AP, affected AP sent request by the WDS chain road direction WCP with work AP.

Because AP provides service on all radio, so affected AP might be the only tuning blink interval of reaching is to send request by adjacent AP to WCP.When response when arriving from WCP, adjacent AP can be tuned to affected AP working channel and this response is transmitted to affected AP.This MU that has guaranteed that affected AP and work AP both continue as in its RF neighborhood provides service (only the cost time seldom is used for communicating by adjacent AP and WCP).

The method and apparatus of controlling for the controlled in wireless plane that provides segmentation plane to dispose as herein described allows the complete honeycomb redundancy of segmentation plane in disposing, the advantage that keeps simultaneously the WCP fault of segmentation plane to shift.In addition, method and apparatus as herein described allows affected AP in the situation that do not access the WCP function and work and reach the long duration and support roaming MU and the fixedly connection of MU between failover period.

Described the flow chart of the specific embodiment of method 100 disclosed herein in Figure 15 A and Figure 15 B.Rectangular element represents with " processing block " in this article and represents computer software instructions or instruction group.Alternately, the processing block representative is by the performed step of function equivalent circuit (for example digital signal processor circuit or application-specific integrated circuit (ASIC) (ASIC)).These flow charts are not described the syntax of any certain programmed language.On the contrary, these flow charts show those skilled in the art and make circuit or produce computer software to carry out the function information required according to processing of the presently claimed invention.Should be noted that many routine key elements (for example, the use of the initialization of loop and variable and temporary variable) are not shown.Unless it will be appreciated by those skilled in the art that herein and point out in addition, the concrete order of described step is illustrative and can be in the situation that does not deviate from spirit of the present invention and change.Therefore, except as otherwise noted, step described below is unordered, and the meaning is in the situation that possiblely can carry out each step by the order of any convenience or expectation.

Method 100 starts from processing block 102, and the first access point (AP) that frame 102 discloses in being disposed by segmentation plane detects the fault that install on controlled in wireless plane (WCP).The WCP device can break down due to the reason (comprising hardware fault, software fault or interconnect fault) of any amount.

Processing block 104 has been stated the SSID that hides by the AP in the beacon of an AP broadcasting.SSID is the title of WLAN.All devices on WLAN all adopt identical SSID, so that intercommunication mutually.

During processing block 106 has been stated and will be stored in the high-speed cache of an AP in the information of the existing mobile unit (MU) of disassociation after the fault that the WCP device detected.Processing block 108 discloses the detection from existing MU has been responded.Processing block 110 has been stated the detection from the MU with the information in high-speed cache has been responded, and makes an AP show as new MU and is exposed to existing MU when being hidden.

Processing block 112 stated and roamed into adjacent AP when then roaming back an AP as existing MU, due to this MU received from an AP for the response of surveying, so an AP is visible for this MU.Processing block 114 discloses an AP and has accepted MU based on the information in high-speed cache.

Processing proceeds to processing block 116, and frame 116 has stated that an AP is in the honeycomb redundant arrangement, and wherein adjacent AP is managed by different controlled in wireless plane devices from an AP.

Processing block 118 has stated that near the new MU that roams into an AP can not listen to the beacon from an AP.When new MU roams near affected AP residential quarter, it can not receive the beacon from affected AP.When new MU surveys on the channel of affected AP residential quarter, it will not obtain any response from affected AP.

Processing block 120 discloses an AP not to responding from the detection that roams near the new MU a AP.Because new MU can not detect affected AP by active or drive sweep, so it will can not attracted to affected AP and will attempt only to connect for its visible AP.

Referring now to Figure 16, show the embodiment that affected AP wherein can provide service.Method 150 starts from processing block 152, and frame 152 has stated that an AP scans its radio frequency (RF) neighborhood to judge whether adjacent AP is reporting wireless data service (WDS).When WCP broke down, affected AP continued as the existing customer service is provided.Affected AP stops reporting wireless data service, and simultaneously unaffected AP continues to report the WDS service.Affected AP can also scan its RF neighborhood to determine reporting any adjacent AP of WDS service.

Processing block 154 discloses when adjacent AP is reporting the WDS service, and an AP sets up the interim WDS link with this adjacent AP, to obtain the access to the controlled in wireless plane function by this adjacent AP.

In case adjacent work AP is determined, affected AP just sets up the interim WDS link with this work AP, to obtain the access to the WCP function by this work AP.

Processing block 156 stated when new MU is associated with an AP, and an AP sends request by adjacent AP to the controlled in wireless plane device via interim wireless WDS link.

" microprocessor " mentioned and " processor " or " this microprocessor " and " this processor " can be understood as that and comprise one or more microprocessors that can communicate in independence and/or distributional environment, therefore and can be configured to communicate with other processor by wire communication or radio communication, wherein this one or more processor can be configured to move in the device of one or more processors controls that can be similar or different device.Therefore, the use of the term of this " microprocessor " or " processor " also can be understood as and comprises CPU, ALU, application-specific integrated circuit (ASIC) (IC) and/or task engine, and these examples in order to illustrate unrestriced purpose and providing.

In addition, except as otherwise noted, the memory of mentioning can comprise the readable and addressable memory element of one or more processors and/or parts, the outside of the inside of the device that this memory element and/or parts can be controlled at processor, the device controlled at processor, and/or can use various communication protocols by wired or wireless network and accessed, and except as otherwise noted, can be set to comprise the combination of external memory and internal storage device, wherein sort memory can be adjacency and/or based on application and subregion.Therefore, the database of mentioning can be understood as that and comprise one or more memories associations, wherein this mentioning (for example can comprise commercially available database product, SQL, Informix, Oracle) and proprietary database, and can comprise other structure for associative storage, such as link, formation, figure, tree, this structure provides for the purpose that illustrates rather than limit.

Except as otherwise noted, the network of mentioning can comprise one or more Intranets and/or the Internet and virtual network.The microprocessor instruction of mentioning in this article according to foregoing or microprocessor executable instruction can be understood as and comprise programmable hardware.

Except as otherwise noted, the use of word " basically " can be understood as that this deviation is not substantially to affect disclosed method and system as exact relationship, state, layout, orientation and/or further feature and the deviation thereof of comprising understood by one of ordinary skill in the art.

In full text of the present disclosure, unless illustrate in addition, be used for the article " " of modification noun or " one " can be understood as that for convenient and use and comprise one or more than one by modification noun.

Unless regulation is separately arranged herein, by accompanying drawing be depicted as communicate, be associated with other something or others and/or based on element, parts, module and/or its part of other something or others can be understood as that communicate, be associated with other something or others like this and/or in mode directly and/or indirectly based on other something or others.

Although by specific embodiment, method and system has been described, they are not limited to this.Obviously, modifications and changes many according to above instruction can become apparent.Those skilled in the art make many other variations in can and arranging the details, material of the each several part of described and explanation herein.

The preferred embodiments of the present invention have been described, have it will be apparent to one skilled in the art that now and to adopt other embodiment that incorporates these concepts into.In addition, but the software that comprises as the present invention part can implement in the computer program that comprises the computer working medium.For example, this computer usable medium can comprise the readable storage device of having stored the computer readable program code section, for example hard disk drive device, CD-ROM, DVD-ROM or computer diskette.Computer-readable medium can also comprise and carries program code segments as optics, the wired or wireless communication link of digital signal or analog signal.Therefore, can think that the present invention should not be limited to described embodiment, only should be subject to the restriction of the spirit and scope of claims on the contrary.

Claims (10)

1. the method carried out of a computer comprises:

The first access point AP in disposing by segmentation plane detects the fault of controlled in wireless plane WCP device;

Hide the SSID by the described AP in the beacon of a described AP broadcasting;

In will the information of the existing mobile unit MU of disassociation be stored in the high-speed cache of a described AP after the fault that described WCP device detected;

Detection from existing MU is responded; And

Detection from the MU with the information in described high-speed cache is responded, be hidden thereby make a described AP show as new MU when being exposed to existing MU.

2. method according to claim 1, wherein, when existing MU roams into adjacent AP when then roaming back a described AP, due to described MU received from a described AP for the response of surveying, so a described AP is visible for described MU.

3. method according to claim 2, wherein, a described AP accepts described MU based on the described information in described high-speed cache.

4. method according to claim 1, wherein, a described AP is in the honeycomb redundant arrangement, and wherein, adjacent AP and a described AP are by different controlled in wireless plane device management.

5. method according to claim 1 wherein, roams near a described AP new MU and can not listen to beacon from a described AP.

6. method according to claim 1, wherein, a described AP is not to responding from the detection that roams near the new MU a described AP.

7. method according to claim 1, comprise that further a described AP scans its radio frequency neighborhood, whether reporting wireless data service WDS to judge adjacent AP.

8. method according to claim 7, wherein, when adjacent AP was reporting the WDS service, a described AP set up interim WDS link with described adjacent AP to obtain the access to the controlled in wireless surface function by described adjacent AP.

9. method according to claim 8, wherein, when new MU was associated with a described AP, a described AP sent request by described adjacent AP to the controlled in wireless plane device via described interim WDS link.

10. the first access point AP comprises:

Memory;

Processor;

Communication interface;

Interconnection mechanism, this interconnection mechanism connects described memory, described processor and described communication interface; And

Wherein, described memory is by with following application code, described application program provides the controlled in wireless plane fault transfer in the segmentation plane deployment to control, described application program is provided for the processing of process information when being performed in described processor, described processing makes a described AP carry out following operation:

A described AP in disposing by segmentation plane detects the fault of controlled in wireless plane WCP device;

Hide the SSID by the described AP in the beacon of a described AP broadcasting;

In will the information of the existing mobile unit MU of disassociation be stored in the high-speed cache of a described AP after the fault that described WCP device detected;

Detection from existing MU is responded;

Detection from the MU with the information in described high-speed cache is responded, be hidden thereby make a described AP show as new MU when being exposed to existing MU;

Wherein, when existing MU roams into adjacent AP when then roaming back a described AP, due to described MU received from a described AP for the response of surveying, so a described AP is visible for described MU, and wherein, a described AP accepts described MU based on the information in described high-speed cache; And

Wherein, a described AP is in the honeycomb redundant arrangement, and wherein adjacent AP and a described AP are by different WCP device managements.

Images