CN101621821A - Method and node for monitoring network in wireless mesh network - Google Patents
Method and node for monitoring network in wireless mesh network Download PDFInfo
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Abstract
The invention discloses a method and a node for monitoring a wireless mesh network. The method for monitoring the wireless mesh network comprises the steps: acquiring information about the node and a path to be monitored in the network; acquiring a monitoring proxy candidate set with maximum link coverage and minimum nodes in the network according to the association between the node and the path in the network, and selecting a node set with larger node residence weight from the proxy candidate set as a monitoring proxy; monitoring the wireless mesh network by the selected monitoring proxy; and sending a network failure report to a failure management center when detecting any network failure. The invention can effectively search and assign a monitoring proxy for the wireless mesh network so as to perform network monitoring and improve the network monitoring efficiency.
Description
Technical field
The present invention relates to the communications field, particularly relate to wireless mesh network Mesh network (WMN, wireless Mesh Network).
Background technology
Wireless Mesh netword is based on the WiMAX access technology of IP agreement, it has merged WLAN (wireless local area network) (WLAN, Wireless LAN) and the Adhoc network advantages, support multi-multipoint network structure, have characteristics such as intelligent advantages such as MANET, selfreparing, multi-hop cascade, node self-management and mobile broadband, wireless location, be the network of a kind of big capacity, two-forty, wide coverage, become a kind of effective means of broadband access.Say that in a sense what the Mesh network was main is a kind of network architecture thought, major function is embodied in no center, MANET, multistage jumper connection and route and judges selection etc.
In the network that adopts the Mesh technology building, its topological structure is grid-like, and typical structure as shown in Figure 1.Whole network is made up of WAP (wireless access point) (AP), wireless router (WR), terminal equipment (CLIENT).Wherein, an AP can connect a plurality of WR in tens to up to a hundred meters scope, the main effect of AP is that wireless network is inserted core net, secondly each terminal equipment that links to each other with WR is linked together, and makes the terminal equipment that wireless network card is housed can share the resource of core net by AP.In addition, described AP can be replaced by smart access point (IAP), and IAP is the equipment that has increased the Adhoc routing function on the basis of AP.In addition, AP/IAP also has network management function, realizes control and management to Radio Access Network, with traditional intelligent being distributed in the access point (AP/IAP), and the construction cost of saving backbone network greatly, the ductility of raising network.As the WR of IAP lower floor configuration, its function is that the terminal equipment (being the user) for bottom provides packet routing and transfer functions, and downloads and realize the radio broadcasting software upgrading from IAP.Route according to spendable node configuration offhand decision is at that time transmitted grouping information promptly realizes dynamic routing.In this network configuration, can realize that by using WR the elasticity of communication range between mobile terminal device and AP extends.Terminal equipment then has both main frame and two kinds of roles of router.On the one hand, terminal equipment is as the relevant application program of main frame operation; On the other hand, terminal equipment need move relevant Routing Protocol as router, participates in common routing operations such as route discovery, route maintenance.
In wireless Mesh netword, any wireless device node all can be simultaneously as router, and each node in the network can both send and received signal, and each node can both carry out direct communication with one or more peer node.The largest benefit of this structure is: congested if nearest AP causes owing to flow is excessive, data can re-route a less adjacent node of communication flows automatically and transmit.The rest may be inferred, and packet can also continue to be routed to nearest with it next node and transmit according to the situation of network, till arriving the final destination.Such access mode is the multi-hop visit.
In carrying out the invention process, the inventor finds that there is following problem at least in above-mentioned prior art wireless mesh network:
Routing Protocol at the cable network design is not useable for mobile ad-hoc network, and subject matter is the unreliability of Radio Link.Because the unreliability of Mesh wireless network need be provided with the fault detect that the monitoring agency helps through network in network.
In the Mesh wireless network, the network failure that causes took place often because node motion or physical link lose efficacy.Therefore in network management, always wish that the fault management center can receive the report all about network failure, so that analyze and maintaining network.After yet fault took place, the loss that how to reduce Trouble Report was the difficult point in the network failure management always.Usually, the loss of Trouble Report is mainly caused by three kinds of situations:
1. the improper operation of certain node and cause that report loses in the fault transfer path, too busy as this node communication, to such an extent as to transmit receiving that report back is not free; When have the ability transmitting, report out of date and be dropped.
2. certain node is not carried out and is transmitted operation and cause that report loses in the fault transfer path, such as the Web Grafiti person who has malice.
3. fault transmits certain bar or some path failure in the route, makes Trouble Report be dropped because of the destination is unreachable.
In communication network, for avoid the generation of above situation as far as possible, the monitoring agency is set in network usually is used for the monitoring network fault, and after monitoring the fault generation, in time Trouble Report is sent to the fault management center, so that response is accurately and timely made by administrative center.For the Mesh wireless network, under perfect condition, each node is the most reliable way to manage as the monitoring agent node of network all.But along with the increase of network size, such method of salary distribution will consume a large amount of Internet resources.
Summary of the invention
The technical problem that the present invention mainly solves provides a kind of monitoring method and node of network in wireless mesh network, can seek and distribute the monitoring agency to carry out network monitor, raising network monitor efficient effectively for the Mesh wireless network.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of monitoring method of network in wireless mesh network is provided, comprises step: need in the network to obtain the node and the routing information of monitoring; According to the incidence relation between node described in the network and the path, link covers maximum in the acquisition network, candidate collection is acted on behalf of in the minimum monitoring of node, selects the bigger node set of the resident weights of node in the candidate collection described agency, acts on behalf of as monitoring; Adopt the described network in wireless mesh network of monitoring agency monitoring of described selection; When monitoring network failure, send described network failure report to the fault management center.
Wherein, link covers maximum, the minimum monitoring of node and acts on behalf of in the step of candidate collection in the described acquisition network, the number of nodes that candidate collection is acted on behalf of in the monitoring of described acquisition account for node sum in the network 1/3rd in.
Wherein, act on behalf of in the step of selecting the bigger node set of the resident weights of node in the candidate collection described, the resident weights of described node are: network insertion control centre distributes to the resident weights of node according to the node situation when node enters described network, and its computing formula is as follows:
Ti＝Wi(r，l，t)
And wi (r, l, t) ∈ [0,1]
In the formula, r is role's parameter that node is born in network, and l is the location parameter of node in network, and t is the residence time parameter that node and network insertion control centre are consulted.
Wherein, describedly send in the step of described network failure report to the fault management center when monitoring network failure, the network failure that monitors comprises: the network failure that node motion or physical link lost efficacy and cause.
Wherein, need the step of the routing information of monitoring to comprise in the described acquisition network: to obtain with route in the network and reflect the relational matrix that links between node and node as association; Delete all column element values in the described relational matrix and be 0 path, needing to obtain the routing information of monitoring.
For solving the problems of the technologies described above, another technical solution used in the present invention is: a kind of network in wireless mesh network node is provided, comprises: the node path acquiring unit is used for obtaining network and needs the node and the routing information of monitoring; Selected cell is acted on behalf of in monitoring, be used for according to the incidence relation between node described in the network and the path, link covers maximum in the acquisition network, candidate collection is acted on behalf of in the minimum monitoring of node, selects the bigger node set of the resident weights of node in the candidate collection described agency, acts on behalf of as monitoring; The network node monitoring means adopts the monitoring agency of described selection to monitor described network in wireless mesh network; Failure report sending is used for sending described network failure report to the fault management center when monitoring network failure.
Wherein, comprising: resident weights acquiring unit is used to obtain when node enters described network network insertion control centre and distributes to the resident weights of node according to the node situation, and adopts computing formula as follows:
Ti＝Wi(r，l，t)
And wi (r, l, t) ∈ [0,1]
In the formula, r is role's parameter that node is born in network, and l is the location parameter of node in network, and t is the residence time parameter that node and network insertion control centre are consulted.
Wherein, comprise: the 802.11Wi-Fi radio frequency component of two cover standards and two cover mesh network architecture MEA mobile broadband radio frequency components, wherein a cover Wi-Fi and MEA radio frequency component are operated in 2.4GHz and exempt from licensed band, and another set of operating frequency is a 5.8GHz public safety licensed band; The frequency range that described 2.4GHz frequency range is used is 2400MHz～2483.5MHz, and being divided into is 4 channels, comprises a Mesh channel, 1 802.11g channel, and 4 channel widths are 20MHz; The employed frequency range of described 5.8GHz frequency range is 5725～5850MHz, and being divided into is 148 channels, and first channel is the Mesh channel, channel width is 20MHz, be control and this channel of data sharing, second begins the channel for 802.11a, and channel width is 10MHz.
Wherein, described network in wireless mesh network node is a WAP (wireless access point).
Wherein, described WAP (wireless access point) connects authorization server, and comprises fire compartment wall, digest authentication unit and preferential open shortest path computing unit.
The invention has the beneficial effects as follows: be different from prior art with each node all as the monitoring agent node of network and the situation that consumes a large amount of Internet resources, the present invention has provided the Mesh wireless network monitoring agent allocation program, method based on the resident weights of node, this method can search out the minimum monitoring that covers crucial link path effectively and act on behalf of candidate collection, and select the optimum monitoring agent node of stability in the network according to the resident weights of node, has less time complexity, analysis result shows, the present invention can seek for the Mesh wireless network effectively and distribute the monitoring agency, improves network monitor efficient.
Description of drawings
Fig. 1 is the network architecture schematic diagram of prior art Mesh wireless network;
Fig. 2 is the monitoring method embodiment flow chart of network in wireless mesh network of the present invention;
Fig. 3 is the theory diagram of network in wireless mesh network node embodiment one of the present invention;
Fig. 4 is the theory diagram of network in wireless mesh network node embodiment two of the present invention;
Fig. 5 is the theory diagram of network in wireless mesh network node embodiment three of the present invention;
Fig. 6 is the theory diagram of network in wireless mesh network node embodiment four of the present invention.
Embodiment
Research emphasis of the present invention is how reasonably to distribute the network monitor agent list of a minimum.The present invention is directed to the characteristic that the Mesh wireless network architecture changes often, the network monitoring method of a kind of utilization based on the monitoring agent allocation program, method of resident weights proposed, the present invention has following characteristics: 1. introduce the resident faith mechanism of node, avoid the expense that produces owing to the frequent replacement of agent node; 2. functional, its time complexity can not be exponential increase along with the expansion of network size.
The present invention introduces the notion of the resident weights of node, the monitoring agent node set that meets the demands is optimized, to distribute the most rational network monitor agency.
Consult Fig. 2, the monitoring method embodiment of network in wireless mesh network of the present invention mainly may further comprise the steps:
Step 101: to need in the network to obtain the node and the routing information of monitoring;
Step 102: according to the incidence relation between node described in the network and the path, link covers maximum in the acquisition network, candidate collection is acted on behalf of in the minimum monitoring of node, select the bigger node set of the resident weights of node in the candidate collection described agency, as the monitoring agency;
Step 103: the described network in wireless mesh network of monitoring agency monitoring that adopts described selection;
Step 104: when monitoring network failure, send described network failure report to the fault management center.
Be different from prior art with each node all as the monitoring agent node of network and the situation that consumes a large amount of Internet resources, the present invention has provided the Mesh wireless network monitoring agent allocation program, method based on the resident weights of node, this method can search out the minimum monitoring that covers crucial link path effectively and act on behalf of candidate collection, and select the optimum monitoring agent node of stability in the network according to the resident weights of node, have less time complexity, do not need each node in the network all as the monitoring agency.
Show that by analysis the present invention can seek for the Mesh wireless network effectively and distribute the monitoring agency, improves network monitor efficient, reduces resource consumption.
In other embodiment of the invention, link covers maximum, the minimum monitoring of node and acts on behalf of in the step of candidate collection in the described acquisition network, the number of nodes that candidate collection is acted on behalf of in the monitoring of described acquisition account for node sum in the network 1/3rd in.
Describedly send in the step of described network failure report to the fault management center when monitoring network failure, the network failure that monitors can be: the network failure that node motion or physical link lost efficacy and cause.
Below describe step 101 in detail for an embodiment:
1, Mesh wireless network monitoring agent allocation
1.1 condition and constraint
List of references " T H Wu.Fiber Network Service Survivability Reading[M] .MA:Ar-tech House; 1992 " method used among the SONET, when a settled approximately fault takes place, may cause by certain node in the network or certain bar link fails, Trouble Report will be sent to upstream node and the descendant node by the network route of fault nidus, and is transmitted by these nodes.Describe for convenient, make the following assumptions:
1. network topology structure be designated as G (N, L);
2. have four routes in the network, they are respectively
α：a\b\c\e，
β：a\b\d\g，
γ: d c e h and
δ：c\e\g\f。
1.2 monitoring agent allocation
1.2.1 mapping matrix
(1) matrix M NRn * r describes the relation between routed path and the node, and n is the node number in the network, and r is the number of routes that exists in the network.If route j is through node i, then corresponding MNRn * r[i, j] value be 1, otherwise be 0.For example, MNRn * r[α, β] value be 1, representing route β through node alpha.
(2) matrix M RLr * l describes the relation that links between routed path and node, and r is the number of routes that exists in the network, and l is internodal link number.If route i is through path j, then corresponding MRLr * l[i, j] value be 1, otherwise be 0.For example, MRLr * l[β, 6] value be 1, representing route through link 6.
Matrix M NRn * r and matrix M RLr * l are multiplied each other, can obtain the relational matrix CNLn * l that links between the node that reflects as association by route in the network and node.
1.2.2 agent allocation table
Construct the assignment agent table according to following rule:
(1) all column element values are 0 path among deletion Matrix C NLn * l, do not have route to pass through this path because all column elements are 0 explanation, thereby even this path is unusual, also can not influence the normal of network, so do not need to monitor; (2) Dui Ying CNLn * l[i, j] 〉=1, correspondence table T[i, j] value be X.For example:
CNLn * l[b, 1]=2 〉=1, so correspondence table T[b, 1]=X.
Below describe step 102 in detail for an embodiment:
According to node shown in the table T and the incidence relation between the path, the monitoring that can obtain the minimum node of maximum link covering is acted on behalf of candidate collection S={{a, c}, { b, c}, { d, c}, { a, e}, { b, e}, { d, e}, { c, g}, { e, g}}.
Because Mesh wireless network node residence time in network is uncertain, therefore residence time is the longest relatively in this network range need to find node as the agency, seeks the required expense of agent node again so that reduce owing to what the agent node deviated from network caused.Therefore, the present invention introduces resident factor Ti, Ti ∈ [0,1].Resident factor Ti is when node enters network, is distributed to the resident weights of node according to the node situation by network insertion control centre.The method that the calculating of these weights can list of references " A Abdul-Rahman, S Hailes.A Distributed TrustModel[C] .Proc.of New Security Paradigms Workshop, 1997.48-60 " mentions, computing formula is as follows:
Ti=Wi (r, l, t) (1) and wi (r, l, t) ∈ [0,1].In the formula, (t) determined by three parameters: r is role's parameter that node is born in network to wi for r, l; L is the location parameter of node in network; T is the residence time parameter that node and access control center are consulted.
Suppose that calculating the resident weights of resulting node by formula is respectively: Ta=0.9, Tb=0.5, Tc=0.8, Td=0.7, Te=0.6, Tf=0.8, Tg=0.3 and Th=0.7.According to acting on behalf of taking all factors into consideration of candidate collection and the resident weights of node, choose that { a, c} also promptly choose node a and node c as the monitoring of network agency, and this monitoring agent list have best stability as the monitoring agent list.
Can realize finding good stability, monitoring agency that cost is low for proof adopts method of the present invention, existing supposition exist network G (N, L, R), wherein N be node in the network to count L be number of links, R is a number of routes.Suppose that multiplication required time of computing is α, and computing one sub-addition required time is β, then according to the present invention, for network G (N, L, R) in monitoring agency's candidate collection seek and need the time spent altogether:
T＝N×[L×[R×\u945X+(R-1)×\u946X]]
By following formula as can be known, the time complexity o≤o (n3) that utilizes the present invention to handle, n=max (N, L, R).Therefore, the present invention can realize the monitoring of network in wireless mesh network simply, effectively.
Consult Fig. 3, the present invention also provides a kind of network in wireless mesh network node embodiment, comprising:
The node path acquiring unit is used for obtaining network and needs the node and the routing information of monitoring;
Selected cell is acted on behalf of in monitoring, be used for according to the incidence relation between node described in the network and the path, link covers maximum in the acquisition network, candidate collection is acted on behalf of in the minimum monitoring of node, selects the bigger node set of the resident weights of node in the candidate collection described agency, acts on behalf of as monitoring;
The network node monitoring means adopts the monitoring agency of described selection to monitor described network in wireless mesh network;
Failure report sending is used for sending described network failure report to the fault management center when monitoring network failure.
Consult Fig. 4, in other embodiments, can also comprise:
Resident weights acquiring unit is used to obtain when node enters described network network insertion control centre and distributes to the resident weights of node according to the node situation, and adopts computing formula as follows:
Ti＝Wi(r，l，t)
And wi (r, l, t) ∈ [0,1]
In the formula, r is role's parameter that node is born in network, and l is the location parameter of node in network, and t is the residence time parameter that node and network insertion control centre are consulted.
Consult Fig. 5, in other embodiments, can also comprise:
The 802.11Wi-Fi radio frequency component of two cover standards and two cover mesh network architecture MEA mobile broadband radio frequency components, wherein a cover Wi-Fi and MEA radio frequency component are operated in 2.4GHz and exempt from licensed band, and another set of operating frequency is a 5.8GHz public safety licensed band;
The frequency range that described 2.4GHz frequency range is used is 2400MHz～2483.5MHz, and being divided into is 4 channels, comprises a Mesh channel, 1 802.11g channel, and 4 channel widths are 20MHz;
The employed frequency range of described 5.8GHz frequency range is 5725～5850MHz, and being divided into is 148 channels, and first channel is the Mesh channel, channel width is 20MHz, be control and this channel of data sharing, second begins the channel for 802.11a, and channel width is 10MHz.
Consult Fig. 6, in some embodiments of the invention, described network in wireless mesh network node is a WAP (wireless access point).Described WAP (wireless access point) connects authorization server, comprises fire compartment wall, digest authentication unit and preferential open shortest path computing unit.Certainly, described network in wireless mesh network node can also be the general node of network, such as the routing node of supporting OSPF (Open Shortest Path First, ospf) agreement etc.
Described network in wireless mesh network node can include 1000MHzAMCC 460EX processor and flash memory, and flash memory comprises U-Boot and Linux 3.0.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. the monitoring method of a network in wireless mesh network is characterized in that:
To need in the network to obtain the node and the routing information of monitoring;
According to the incidence relation between node described in the network and the path, link covers maximum in the acquisition network, candidate collection is acted on behalf of in the minimum monitoring of node, selects the bigger node set of the resident weights of node in the candidate collection described agency, acts on behalf of as monitoring;
Adopt the described network in wireless mesh network of monitoring agency monitoring of described selection;
When monitoring network failure, send described network failure report to the fault management center.
2. the monitoring method of network in wireless mesh network according to claim 1 is characterized in that, link covers maximum in the described acquisition network, the minimum monitoring of node is acted on behalf of in the step of candidate collection, comprising:
The number of nodes that candidate collection is acted on behalf of in the monitoring of described acquisition account for node sum in the network 1/3rd in.
3. the monitoring method of network in wireless mesh network according to claim 2 is characterized in that, acts on behalf of in the step of selecting the bigger node set of the resident weights of node in the candidate collection described, and the resident weights of described node are:
Network insertion control centre distributes to the resident weights of node according to the node situation when node enters described network, and its computing formula is as follows:
Ti＝Wi(r，l，t)
And wi (r, l, t) ∈ [0,1]
In the formula, r is role's parameter that node is born in network, and l is the location parameter of node in network, and t is the residence time parameter that node and network insertion control centre are consulted.
4. according to the monitoring method of each described network in wireless mesh network of claim 1 to 3, it is characterized in that describedly send in the step of described network failure report to the fault management center, the network failure that monitors comprises when monitoring network failure:
The network failure that node motion or physical link lost efficacy and cause.
5. according to the monitoring method of each described network in wireless mesh network of claim 1 to 3, it is characterized in that, need the step of the routing information of monitoring to comprise in the described acquisition network:
Obtain with route in the network and reflect the relational matrix that links between node and node as association;
Delete all column element values in the described relational matrix and be 0 path, needing to obtain the routing information of monitoring.
6. a network in wireless mesh network node is characterized in that, comprising:
The node path acquiring unit is used for obtaining network and needs the node and the routing information of monitoring;
Selected cell is acted on behalf of in monitoring, be used for according to the incidence relation between node described in the network and the path, link covers maximum in the acquisition network, candidate collection is acted on behalf of in the minimum monitoring of node, selects the bigger node set of the resident weights of node in the candidate collection described agency, acts on behalf of as monitoring;
The network node monitoring means adopts the monitoring agency of described selection to monitor described network in wireless mesh network;
Failure report sending is used for sending described network failure report to the fault management center when monitoring network failure.
7. network in wireless mesh network node according to claim 6 is characterized in that, comprising:
Resident weights acquiring unit is used to obtain when node enters described network network insertion control centre and distributes to the resident weights of node according to the node situation, and adopts computing formula as follows:
Ti＝Wi(r，l，t)
And wi (r, l, t) ∈ [0,1]
In the formula, r is role's parameter that node is born in network, and l is the location parameter of node in network, and t is the residence time parameter that node and network insertion control centre are consulted.
8. network in wireless mesh network node according to claim 6 is characterized in that, comprising:
802.11 Wi-Fi radio frequency components of two cover standards and two cover mesh network architecture MEA mobile broadband radio frequency components, wherein a cover Wi-Fi and MEA radio frequency component are operated in 2.4GHz and exempt from licensed band, and another set of operating frequency is a 5.8GHz public safety licensed band;
The frequency range that described 2.4GHz frequency range is used is 2400MHz～2483.5MHz, and being divided into is 4 channels, comprises a Mesh channel, 1 802.11g channel, and 4 channel widths are 20MHz;
The employed frequency range of described 5.8GHz frequency range is 5725～5850MHz, and being divided into is 148 channels, and first channel is the Mesh channel, channel width is 20MHz, be control and this channel of data sharing, second begins the channel for 802.11a, and channel width is 10MHz.
9. network in wireless mesh network node according to claim 6 is characterized in that, described network in wireless mesh network node is a WAP (wireless access point).
10. network in wireless mesh network node according to claim 9 is characterized in that, described WAP (wireless access point) connects authorization server, comprises fire compartment wall, digest authentication unit and preferential open shortest path computing unit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607744A (en) * | 2013-12-04 | 2014-02-26 | 湖南大学 | Opportunistic routing method for sensing mesh network channels of multi-radio-frequency multi-channel wireless network |
| CN106789150A (en) * | 2016-11-22 | 2017-05-31 | 广州市诚毅科技软件开发有限公司 | A kind of network fault detecting method and device |
| CN110445715A (en) * | 2019-07-11 | 2019-11-12 | 首都师范大学 | Flow monitoring dispositions method and device in Autonomous Domain network |
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2009
- 2009-07-30 CN CN200910108861A patent/CN101621821A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607744A (en) * | 2013-12-04 | 2014-02-26 | 湖南大学 | Opportunistic routing method for sensing mesh network channels of multi-radio-frequency multi-channel wireless network |
| CN103607744B (en) * | 2013-12-04 | 2016-04-27 | 湖南大学 | A kind of chance method for routing of many radio frequencies multi-channel wireless net mesh network channel-aware |
| CN106789150A (en) * | 2016-11-22 | 2017-05-31 | 广州市诚毅科技软件开发有限公司 | A kind of network fault detecting method and device |
| CN106789150B (en) * | 2016-11-22 | 2020-04-17 | 广州市诚毅科技软件开发有限公司 | Network fault detection method and device |
| CN110445715A (en) * | 2019-07-11 | 2019-11-12 | 首都师范大学 | Flow monitoring dispositions method and device in Autonomous Domain network |
| CN110445715B (en) * | 2019-07-11 | 2021-11-16 | 首都师范大学 | Method and device for monitoring and deploying flow in autonomous domain network |
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