CN101616426B - Method for avoiding wireless mesh network loop and mobile wireless mesh network access point - Google Patents
Method for avoiding wireless mesh network loop and mobile wireless mesh network access point Download PDFInfo
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- CN101616426B CN101616426B CN2009100891359A CN200910089135A CN101616426B CN 101616426 B CN101616426 B CN 101616426B CN 2009100891359 A CN2009100891359 A CN 2009100891359A CN 200910089135 A CN200910089135 A CN 200910089135A CN 101616426 B CN101616426 B CN 101616426B
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Abstract
The invention provides a method for avoiding wireless MESH network loop and a mobile wireless MESH network access point (MP). The method comprises the following steps: the mobile MP selects one link from MESH links established by the mobile MP and fixed MPs as an active link and other MESH links are taken as dormant links; when the preset switching condition is satisfied, the active link is switched into the dormant link and the dormant links which satisfy the switching condition are switched into the active links; wherein, the mobile MP carries out data transceiving on the active link but only maintains the connection statuses of the MESH links on the dormant links. The invention can improve the MP transceiving capacity and reduce the packet loss while avoiding the loop in the MESH network.
Description
Technical field
The present invention relates to network communications technology field, particularly a kind of method and mobile wireless mesh network access point (MP) of avoiding wireless mesh (MESH) network loop.
Background technology
In conventional WLAN (WLAN) technology, all connect between each access point (AP) by cable network, be the wireless connections of single-hop between wireless terminal (STA) and the wired backbone.Along with the development of wireless technology, wireless mesh (MESH) network because of its have networking flexibility and easily advantage be used widely gradually.As shown in Figure 1, between STA and the wired backbone, may there be many wireless connections in other words and between the AP in the MESH network.Specifically, both may wired connection between AP and the AP, also may be wireless connections.Usually will support that the AP of MESH function is called MP, the Radio Link of setting up between the MP is called MESH link.The fixed MP that connects by cable network is called fixedly MP, with the MP of other MP by wireless connections movably MP be called mobile MP.
In the MESH networking, as long as configuration allows and the intensity of wireless signal is suitable, MP just can set up MESH link with MP on every side, and this randomness of setting up link is easy to cause the broadcasting loop in the MESH network.Shown in each MP among Fig. 1, the MESH link that sets up between each MP produces loop, in case loop produces, the broadcast storm of its initiation may make whole network congestion, even makes the load of each MP collapse, and the service of any data forwarding can't be provided.
In order to solve the network loop problem, propose to adopt two layers of MESH route or two kinds of technology of Multiple Spanning Tree Protocol (MSTP) in the prior art.Some link in the MESH network is blocked in calculating by these two kinds of technology, thereby prevents the loop that may occur, and the link that gets clogged simultaneously can be used as redundant link.
Yet, no matter be two layers of MESH route or MSTP technology, all need each the MP collaborative work in the network, each MP need issue the link information of self in network, and the link information by other each MP issue carries out link and calculates, thus the obstruction of total network links or open on reach an agreement.As previously mentioned, mobile MP in the MESH network can set up or deletion MESH link with the MP that closes in moving, if the translational speed of mobile MP is very fast, set up or delete the speed of MESH link so also accelerates thereupon, for the MP that has used two layers of MESH route or MSTP technology, each MP needs constantly the link information of self to be issued, and constantly carries out link and calculate.Link change is fast more, and each MP information releasing amount is big more, and amount of calculation is also big more, will inevitably cause the flow transfer capability of each MP to descend, and when the speed of link change surpasses the convergence capabilities of MP, may cause the interruption of whole network traffics and the increase of packet loss.
Give one example at this, the MESH technology is usually utilized in such as traffic systems such as subways, as shown in Figure 2, usually at the subway operation fixedly MP that lays along the line, fixedly MP can be connected with the center control machine room by switch, for convenience subway is controlled or information gathering, and mobile MP can be set in subway carriage, this mobile MP is connected with vehicle-mounted data equipment, is responsible for the MESH network insertion and the data forwarding of vehicle-mounted data equipment.When subway compartment high-speed mobile, be equivalent to mobile MP and carry out high-speed mobile, mobile MP and the fixedly signal strength signal intensity between the MP on every side can take place to change more significantly, thereby can set up new link continually or remove some existing link, therefore, when how avoiding the MESH intermediate ring road under this environment, improve the transfer capability of MP, reduce packet loss, become assurance traffic system reliability institute urgent problem.
Summary of the invention
In view of this, the invention provides a kind of method and mobile MP of the MESH of avoiding network intermediate ring road, so that when avoiding MESH network intermediate ring road, improve the transfer capability of MP and reduce packet loss.
A kind of method of avoiding the netted loop of MESH, this method comprises:
Mobile wireless mesh network access point MP from this move MP with each fixedly the MESH that sets up of MP select one as active hyperlink link, all the other MESH link and link as dormancy;
When default switching condition is satisfied, active hyperlink is switched to the dormancy link, and the dormancy link that will satisfy switching condition switches to active hyperlink;
Wherein, mobile MP receives and dispatches at the enterprising line data of active hyperlink, and chains the connection status of only keeping the MESH link in dormancy.
A kind of mobile MP, this moves MP and comprises: link selected cell, condition judgment unit and message process unit;
Described link selected cell, be used for from this move MP with each fixedly the MESH that sets up of MP link and selects one as active hyperlink, all the other MESH link and link as dormancy; After receiving the switching notice that described condition judgment unit sends, active hyperlink is switched to the dormancy link, and the dormancy link that will satisfy switching condition switches to active hyperlink;
Described condition judgment unit is used to judge whether default switching condition is satisfied, if send the switching notice of carrying the dormancy link information that satisfies switching condition to described link selected cell;
Described message process unit is used in the enterprising line data transmitting-receiving of described active hyperlink, and chains the connection status of only keeping the MESH link in dormancy.
As can be seen from the above technical solutions, in method provided by the invention and mobile MP, only a MESH link who links with fixing MP is carried out data transmit-receive as active hyperlink at mobile MP, all the other MESH link only keep connection status as the dormancy link, thereby avoid the MESH network loop effectively.And, method provided by the invention only need be carried out the selection and the switching of link at mobile MP end, need not fixing MP is carried out any change, and each MP need not carry out the issue and the link calculating of self link information, alleviate the burden of each MP greatly, improved the transfer capability of MP; Also avoid the delivery flow rate of the link information of each MP issue in the network, reduced network congestion.Mobile MP is with the redundancy of dormancy link as active hyperlink, when the change in topology that causes in high-speed mobile satisfies switching condition, one of them dormancy link and active hyperlink can be carried out role exchange, this mode can realize the flow seamless switching that change in topology causes well, reduces packet loss greatly.
Description of drawings
Fig. 1 is the networking schematic diagram of MESH network of the prior art;
Fig. 2 is the MESH network diagram that is applied in the traffic system;
(a) among Fig. 3 and (b) be the Link State figure in two moment in the subway running that provides of the embodiment of the invention;
The structure chart of the mobile MP that Fig. 4 provides for the embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Method provided by the invention mainly comprises: mobile MP selects one as active hyperlink (Active link) from itself and each MESHlink that fixedly MP sets up, all the other MESH link are as dormancy (Dormant link), when default switching condition is satisfied, Active link is switched to Dormantlink, and the Dormant link that will satisfy switching condition switches to Active link; Wherein, mobile MP receives and dispatches at the enterprising line data of Active link, and only keeps the connection status of MESH link on Dormant link.
In the present invention, mobile MP follow link establishment principle in the MESH technology and each fixedly MP set up or remove MESH link.Be specifically as follows: the channel quality of the fixedly MP that receives as mobile MP is more than or equal to the link maintenance channel quality and when being less than or equal to the saturated channel quality of link, set up and the fixing MESH link between the MP, otherwise do not set up and be somebody's turn to do fixedly MESHlink between the MP or dismounting and be somebody's turn to do the MESH link that fixedly set up between the MP.Wherein, channel quality can adopt received signal intensity indication (RSSI) to identify.Fixedly do not set up any MESHlink between the MP at each, can carry out wired connection by switch.
In addition, need to prove that the present invention does not need to change for fixing MP, carrying out MESH link when connecting, initiatively initiate foundation and the dismounting of MESH link by mobile MP according to the channel quality that receives, these can be realized by configurations in advance.
More preferably, move for fear of mobile MP and other and to set up MESH link between MP and bring loop, can dispose mobile MP and not accept the MESH link that other MP initiatively initiates and set up process, perhaps, different mobile MP is configured in the different MESH networks.
Be that example is described in detail said method still below so that mobile MP to be set in the subway shown in Fig. 2.Mobile MP and fixedly MP can all adopt directional antenna transmitting/receiving wireless signal, be used to avoid the fixedly phase mutual interference of the channel between the MP, and approaching more in the horizontal direction some fixedly MP, MP receive this fixedly the channel quality of MP are strong more, otherwise weak more.
Mobile MP is in the moving process along with subway, according to receiving each fixedly channel quality of MP, when satisfying the link establishment condition, set up MESH link with the fixedly MP that satisfies the link establishment condition, do not set up MESH link or remove the MESHlink that has set up with the fixedly MP that does not satisfy the link establishment condition.
Suppose that mobile MP moves to the position shown in (a) among Fig. 3, at this moment, the channel quality that receives MP1 is less than the link maintenance channel quality, the MESH link that sets up between then mobile MP dismounting and the MP1, if the channel quality that receive MP2, MP3 and MP4 this moment is between link maintenance channel quality and the saturated channel quality of link the time, mobile MP is the MESH link between foundation and MP2, MP3 and the MP4 respectively.
Mobile MP selects one as Active link in the MESH link that sets up with fixing MP, other as Dormant link.Wherein, Active link shows as link UP, allows transceive data, and Dormant link shows as link Down, can not transmit data, thereby but the protocol massages that can normally receive and dispatch MESH link is kept the connection status of MESH link.
When selecting Active link, the channel quality that can selective reception arrives the highest as Activelink, certainly, can also adopt other selection mode, at this, do not do concrete restriction.If only there is a MESH link, then with this MESH link as Active link.
When default switching condition is satisfied, Active link can be switched to Dormant link, and the Dormant link that will satisfy switching condition switches to Active link, promptly switch to transceive data on the other MESH link, and, this switching is carried out by mobile MP, for fixedly MP is also invisible.
Wherein, default switching condition can for: the difference of the channel quality of the channel quality of the Dormant link that receives and current Active link can think then that more than or equal to the switch area thresholding of presetting this Dormant link satisfies switching condition.In addition, frequent switching for fear of link causes the performance loss of MP and the instability of transceive data, the link retention time can further be set, MESHlink is at least this link retention time as the duration of Active link, at this moment, default switching condition can for: the duration of current Active link is more than or equal to the link retention time, and the difference of the channel quality of the channel quality of Dormant link and current Active link is more than or equal to default switch area thresholding, and then this Dormant link satisfies switching condition.If exist many Dormantlink to satisfy switching condition, then the Dormant link that therefrom the selective channel quality is the highest or optional Dormant link switch to Active link.
In addition, need to prove, because Active link has a link retention time, therefore, may be in the retention time at the link of this Active link, its channel quality is lower than the link maintenance channel quality, and this Active link can be removed, that is to say that the MESH link of dismounting may be Active link.At this situation, mobile MP can judge whether the MESH link of this dismounting is Active link when removing MESH link, if, then after removing this MESH link, from remaining MESH link, select a MESH link again as Active link.
Above-mentioned switching condition is foundation with the channel quality, and the present invention does not get rid of in conjunction with other parameter as switching condition.
Subway is in the process of advancing, suppose to run to the position shown in (a) among Fig. 3, among this moment the MESH link that mobile MP set up, the MESH link that sets up with fixing MP3 is Active link, is Dormant link with the MESH link of fixedly MP2, fixedly MP4 foundation.
If subway runs to the position shown in (b) among Fig. 3, mobile MP receives fixedly that the channel quality of MP2 is lower than the link maintenance channel quality, removes and the fixing MESH link of MP2; Mobile MP receives the channel quality of fixing MP5 between link maintenance channel quality and the saturated channel quality of link, sets up and the fixing MESH link of MP5.Suppose this moment and fixedly the MESHlink between the MP3 as the duration of Active link more than or equal to the link retention time, and the channel quality that receives fixing MP4 and the channel quality that receives fixing MP3 are more than or equal to the switch area thresholding of presetting, then mobile MP will and fixedly the MESH link between the MP3 switch to Dormant link, will and fixedly the MESH link between the MP4 switch to Active link.But, and if fixedly the MESH link between the MP3 as the duration of Active link less than the link retention time, then do not switch.
Because switching on mobile MP of link realize, also invisible for fixing MP, therefore, before the link switchover, when MAC address learning, in the forwarding-table item of foundation, this MAC Address corresponding port that moves MP is original Active link corresponding port.After carrying out link switchover, mobile MP no longer receives and dispatches message in former Active link corresponding port, and the aging mechanism iff relying on forwarding-table item then may cause the flow interrupt of long period.At this situation, mobile MP needs in time to notify fixedly, and MP refreshes forwarding-table item, and therefore, mobile MP can be when setting up new Activelink, and sending source MAC by new Active link be the multicast or the broadcasting packet of the MAC Address of mobile MP.Like this, the fixedly MP that receives this multicast or broadcasting packet just can refresh forwarding-table item rapidly, with the MAC Address corresponding port of new Active link corresponding port as mobile MP, thereby E-Packet to new Active link corresponding port, thus when reduce switching the message dropping that may bring.
More than be the detailed description that method provided by the present invention is carried out, below mobile MP provided by the present invention be described in detail.The structural representation of the mobile MP that Fig. 4 provides for the embodiment of the invention, as shown in Figure 4, this moves MP and can comprise: link selected cell 401, condition judgment unit 402 and message process unit 403.
Link selected cell 401, fixedly one of the MP MESH link selection of setting up is as Active link with each to be used for moving MP from this, and all the other MESH link are as Dormant link; After receiving the switching notice of condition judgment unit 402 transmissions, Active link is switched to Dormant link, the Dormant link that satisfies switching condition is switched to Active link.
Wherein, this mobile MP can also comprise: link processing unit 404, be used at this channel quality that moves the fixedly MP that MP receives more than or equal to the link maintenance channel quality and when being less than or equal to the saturated channel quality of preset link, set up and this fixing MESH link between the MP; Otherwise do not set up and be somebody's turn to do fixedly MESH link between the MP or dismounting and be somebody's turn to do the MESH link that fixedly set up between the MP.
This link processing unit 404 can be mobile MP existing unit.
More preferably, because when removing a MESH link, that remove may be Active link, at this situation, this mobile MP can also comprise: remove judging unit 405, be used in the link processing unit 404 when removing MESH LINK, judge whether the MESH LINK that removes is Active link, if then trigger link selected cell 401 moves at this and selects one among each current MESH LINK of MP as Active link.
Particularly, condition judgment unit 402 more than or equal to default switch area thresholding, determines then that default switching condition is satisfied in this difference of channel quality that moves the channel quality of the Dormant link that MP receives and Active link; Perhaps, duration of Active link more than or equal to the preset link retention time, and the difference of the channel quality of the Dormant link that this mobile MP receives and the channel quality of Active link determines then that more than or equal to default switch area thresholding default switching condition is satisfied; When switching condition is satisfied, with the difference of the channel quality of channel quality and Active link more than or equal to one among the Dormant link of default switch area thresholding as the Dormant link that satisfies switching condition.
In addition, MP goes up the forwarding-table item of setting up by the MAC address learning function in order can in time to refresh fixedly, message process unit 403, can also be used for when link selected cell 401 is chosen as a MESHlink Active link or switches to Active link, on Active link, send source MAC immediately and move the multicast message or the broadcasting packet of the MAC Address of MP for this.Like this, the fixedly MP that receives this multicast or broadcasting packet just can refresh forwarding-table item rapidly, with the MAC Address corresponding port of new Active link corresponding port as mobile MP, thereby E-Packet to new Active link corresponding port, thus when reduce switching the message dropping that may bring.
By above description as can be seen, in method provided by the invention and mobile MP, only a MESH link who links with fixing MP is carried out data transmit-receive as active hyperlink at mobile MP, all the other MESH link only keep connection status as the dormancy link, thereby avoid the MESH network loop effectively.And, method provided by the invention only need be carried out the selection and the switching of link at mobile MP end, need not fixing MP is carried out any change, and each MP need not carry out the issue and the link calculating of self link information, alleviate the burden of each MP greatly, improved the transfer capability of MP; Also avoid the delivery flow rate of the link information of each MP issue in the network, reduced network congestion.Mobile MP is with the redundancy of Dormantlink as Active link, when the change in topology that causes in high-speed mobile satisfies switching condition, one of them Dormant link and Active link can be carried out role exchange, this mode can realize the flow seamless switching that change in topology causes well, reduces packet loss greatly.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (11)
1. a method of avoiding wireless mesh MESH network loop is characterized in that, this method comprises:
When the channel quality of the fixedly MP that receives as mobile mesh network access point MP is kept channel quality and is less than or equal to the saturated channel quality of preset link more than or equal to preset link, set up with this fixedly the MESH between the MP link;
Described mobile MP from this move MP with each fixedly the MESH that sets up of MP select one as active hyperlink link, all the other MESH link and link as dormancy;
When default switching condition is satisfied, active hyperlink is switched to the dormancy link, and the dormancy link that will satisfy switching condition switches to active hyperlink;
Wherein, mobile MP receives and dispatches at the enterprising line data of active hyperlink, and chains the connection status of only keeping the MESH link in dormancy.
2. method according to claim 1, it is characterized in that, this method also comprises: the channel quality of the fixedly MP that receives as described mobile MP is kept channel quality less than preset link or greater than the saturated channel quality of preset link, does not set up to link or remove with this MESH that fixedly set up between the MP with the fixing MESH between the MP to link.
3. method according to claim 2 is characterized in that, described mobile MP judges whether the MESH link of removing is active hyperlink when removing the MESH link, if then select one as active hyperlink in each current MESH link of described mobile MP.
4. according to claim 1 or 3 described methods, it is characterized in that being chosen as of described active hyperlink: the highest MESH link of selective channel quality is as active hyperlink.
5. method according to claim 1 is characterized in that, the difference of the channel quality that the dormancy that receives as described mobile MP links and the channel quality of active hyperlink is more than or equal to default switch area thresholding, and then Yu She switching condition is satisfied; Perhaps, when duration of active hyperlink more than or equal to the preset link retention time, and the difference of the channel quality of the dormancy that described mobile MP receives link and the channel quality of active hyperlink is more than or equal to default switch area thresholding, and then Yu She switching condition is satisfied;
When switching condition was satisfied, during the difference of channel quality and the channel quality of active hyperlink linked more than or equal to the dormancy of default switch area thresholding one linked as the dormancy of satisfying switching condition.
6. according to claim 1,2,3 or 5 described methods, it is characterized in that, when a MESH link was selected as active hyperlink or is switched into active hyperlink, described mobile MP sent source MAC immediately and moves the multicast message or the broadcasting packet of the MAC Address of MP for this on active hyperlink.
7. one kind is moved netted MESH Network Access Point MP, it is characterized in that this moves MP and comprises: link processing unit, link selected cell, condition judgment unit and message process unit;
Described link processing unit, the channel quality that is used for the fixedly MP that receives at described mobile MP be more than or equal to the link maintenance channel quality and when being less than or equal to the saturated channel quality of preset link, set up with this fixedly the MESH between the MP link;
Described link selected cell, be used for from this move MP with each fixedly the MESH that sets up of MP link and selects one as active hyperlink, all the other MESH link and link as dormancy; After receiving the switching notice that described condition judgment unit sends, active hyperlink is switched to the dormancy link, and the dormancy link that will satisfy switching condition switches to active hyperlink;
Described condition judgment unit is used to judge whether default switching condition is satisfied, if send the switching notice of carrying the dormancy link information that satisfies switching condition to described link selected cell;
Described message process unit is used in the enterprising line data transmitting-receiving of described active hyperlink, and chains the connection status of only keeping the MESH link in dormancy.
8. mobile MP according to claim 7, it is characterized in that, described link processing unit, also be used at this channel quality that moves the fixedly MP that MP receives during, do not set up to link or remove with this MESH that fixedly set up between the MP and link with the fixing MESH between the MP less than the link maintenance channel quality or greater than the saturated channel quality of preset link.
9. mobile MP according to claim 8, it is characterized in that, this mobile MP also comprises: remove judging unit, be used for when described link processing unit is removed the MESH link, judge whether the MESH link of removing is active hyperlink, if then trigger described link selected cell and move in current each MESH link of MP at this and select one as active hyperlink.
10. mobile MP according to claim 7, it is characterized in that, described condition judgment unit more than or equal to default switch area thresholding, determines then that the switching condition of presetting is satisfied in the difference of this channel quality that moves the dormancy link that MP receives and the channel quality of active hyperlink; Perhaps, duration of active hyperlink more than or equal to the preset link retention time, and the difference of the channel quality of the dormancy that this mobile MP receives link and the channel quality of active hyperlink determines then that more than or equal to default switch area thresholding default switching condition is satisfied; When switching condition was satisfied, during the difference of channel quality and the channel quality of active hyperlink linked more than or equal to the dormancy of default switch area thresholding one linked as the dormancy of satisfying switching condition.
11. according to the described mobile MP of the arbitrary claim of claim 7 to 10, it is characterized in that, described message process unit, also be used for when described link selected cell is chosen as a MESH link active hyperlink or switches to active hyperlink, on active hyperlink, sending source MAC immediately and moving the multicast message or the broadcasting packet of the MAC Address of MP for this.
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| CN101801058B (en) * | 2010-03-24 | 2013-04-17 | 杭州华三通信技术有限公司 | Method and device for refreshing media access control (MAC) items in Mesh mobile application network |
| US9072110B2 (en) | 2010-11-08 | 2015-06-30 | Mediatek Inc. | Method for UE pattern indication and measurement for interference coordination |
| WO2017015904A1 (en) * | 2015-07-29 | 2017-02-02 | 华为技术有限公司 | Data transmission method, device and system for wireless local area network mesh network |
| CN108990170B (en) * | 2018-07-20 | 2020-08-28 | 新华三技术有限公司 | Mesh link establishment method and device, fat AP and storage medium |
| CN109547339B (en) * | 2019-01-18 | 2021-07-09 | 深圳市吉祥腾达科技有限公司 | Method and system for preventing network from forming loop in wireless router networking |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Patentee after: Xinhua three Technology Co., Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Patentee before: Huasan Communication Technology Co., Ltd. |