CN102036425B - Wireless mesh network communication method and equipment based on border gateway - Google Patents
Wireless mesh network communication method and equipment based on border gateway Download PDFInfo
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Abstract
The embodiment of the invention provides a wireless mesh network communication method and equipment based on a border gateway. The method comprises the following steps of: receiving identification information sent by a neighbor network node by a border node; judging whether the neighbor network node sending the identification information and the border node are in the same Mesh network according to the identification information; when the neighbor network node and the border node are not in the same Mesh network, carrying out border gateway negotiation by the border node and the neighbor network node, and determining the border gateway; forming a border gateway group by a plurality of border gateways; and sharing processing data forwarding to lighten the processing capacity of single-point equipment. The technical scheme provided by the invention can solve the problem that intercommunication nodes between the geographically adjacent wireless mesh networks directly communicate by a wireless link by building intercommunication links between the wireless mesh networks, the intercommunication method between networks is flexible, data forwarding efficiency is improved, and hollow cost for data forwarding is reduced.
Description
Technical field
The embodiment of the present invention is about the communication technology, especially in regard to the wireless mesh network communication in the communication technology, a kind of wireless mesh network communication method and equipment based on borde gateway.
Background technology
Mesh network (Mesh Network:MN) can combine with the technology such as multiple wireless access wide band technology, 3G mobile communication, forms the wireless mesh network (Wireless MeshNetwork:WMN) that contains multi-hop wireless link.As shown in Figure 1,802.11s protocol definition wifi mesh network communications method.Communication between different radio mesh network is to be used and had line method communication by the wireless mesh network outlet (MeshNetwork Portal:MPP) as gateway.Even two nodes that geographical position is adjacent, if belong to separately different wireless mesh network, so also must communicate by outlet gateway separately.
802.11s agreement has stipulated that the communication between mesh network must be exported and be carried out intercommunication forwarding by mesh network.Mesh network outlet is by wired two layers of 802.1D bridge joint or two mesh network communications of three layers of IP route implementing.
The routing to communicate mechanism of a kind of wired network and wireless network is proposed at present.It is for access node, to have defined two kinds of signs: default set sign and current group of sign.It is that default set by current group of sign of one of them access node is configured to opposite end access node identifies to realize that default value identifies the method for setting up link between two different access nodes.But according to this method, between the group of different groups, communication remains by route access node and carries out wire communication.
Summary of the invention
The embodiment of the present invention proposes a kind of wireless mesh network communication method and equipment based on borde gateway, and the communication that can solve between different mesh networks all must cannot realize the problem of radio communication by means of cable network.
The embodiment of the present invention provides a kind of wireless mesh Mesh network communication method, comprising:
Boundary node receives the identification information that neighbor networks node sends;
The neighbor networks node that sends this identification information according to described identification information judgment whether with described boundary node in same Mesh net;
When described neighbor networks node and described boundary node be not during at same Mesh network, described boundary node and described neighbor networks node carry out borde gateway negotiation, determine borde gateway;
Described boundary node is the intercommunication link with described neighbor networks node by described borde gateway foundation.
Further, the embodiment of the present invention provides a kind of wireless mesh network communication equipment, comprising:
Receiving element, for receiving the identification information of neighbor networks node broadcasts;
Whether judging unit, for netting at same Mesh according to the neighbor networks node of described identification information judgment and described this identification information of transmission;
Negotiation element, for when during not at same Mesh network, carrying out borde gateway negotiation with described neighbor networks node with described neighbor networks node, determines borde gateway;
Link establishment unit, sets up the intercommunication link with described neighbor networks node for described boundary node by described borde gateway.
The embodiment of the present invention by setting up intercommunication link between wireless mesh network, overcome wireless lead to adjacent networks still need multi-hop to gateway again by the defect of wired intercommunication, solved intercommunication node between the adjacent wireless mesh network in geographical position and can not pass through the method for wireless link direct communication; Make between network interoperability methods more flexible, promoted the efficiency of data retransmission, reduced the empty overhead of data retransmission.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The flow chart of the wireless mesh network communication method based on borde gateway that Fig. 1 provides for the embodiment of the present invention;
The wireless mesh network structural representation that Fig. 2 provides for the embodiment of the present invention;
The flow chart of the wireless mesh network communication method based on borde gateway that Fig. 3 provides for the embodiment of the present invention;
The flow chart of the establishment multi-hop link of the wireless mesh network communication method based on borde gateway that Fig. 4 provides for the embodiment of the present invention;
The schematic diagram of the single-hop intercommunication link forwarding data that Fig. 5 provides for the embodiment of the present invention;
The schematic diagram of the multi-hop intercommunication link forwarding data that Fig. 6 provides for the embodiment of the present invention;
The borde gateway group that Fig. 7 provides for the embodiment of the present invention shares the schematic diagram of processing forward data;
Fig. 8 is the structured flowchart of embodiment of the present invention wireless mesh network communication equipment;
Fig. 9 is the structured flowchart of further embodiment of this invention wireless mesh network communication equipment.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment mono-
As shown in Figure 1, the wireless mesh network communication method based on borde gateway of the embodiment of the present invention comprises the following steps:
S101, boundary node receives the identification information that neighbor networks node sends;
S102, the neighbor networks node that sends this identification information according to described identification information judgment whether with described boundary node in same Mesh net;
S103, when described neighbor networks node and described boundary node be not during at same Mesh network, described boundary node and described neighbor networks node carry out borde gateway negotiation, determine borde gateway;
S104, described boundary node is the intercommunication link with described neighbor networks node by described borde gateway foundation.
The embodiment of the present invention consults to set up intercommunication link between wireless mesh network by borde gateway, overcome the wireless adjacent networks that can communicate by letter still need multi-hop to gateway again by the defect of wired intercommunication, provide intercommunication node between the adjacent wireless mesh network in geographical position can pass through the method for wireless link direct communication; Make between network interoperability methods more flexible, promoted the efficiency of data retransmission, reduced the empty overhead of data retransmission.
Embodiment bis-
The present embodiment comprises:
S201, boundary node receives the identification information that neighbor networks node sends.
Identification information carries by beacon frame (beacon frame) in the present embodiment, after boundary node receives the beacon frame of neighbor networks node broadcasts, reads identification information (Mesh ID) and corresponding ability information.
S202, the neighbor networks node that sends this identification information according to described identification information judgment whether with this boundary node in same Mesh net.
Judge whether this Mesh ID is the network identity of own present networks.If the network identity of own present networks illustrates in same Mesh net.Network identity if not own present networks illustrates not in same mesh net.If this Mesh ID is not the network identity of own present networks, search in RoamingList, whether there has been this Mesh ID, if existed, represented that neighbor networks has been set up intercommunication link therewith, the opposite end that further judgement sends beacon frame whether with oneself created intercommunication link, if it is needn't create again new link.If not further carrying out borde gateway role negotiation.If there is not this Mesh ID in roaming list (Roaming List), whether this fringe node will set up intercommunication link with opposite end network according to own ability information and intercommunication strategy decision, and ability information and intercommunication strategy can comprise the whether roaming agreement record between compatibility or each network etc. of security capabilities.
S203, when described neighbor networks node and described boundary node be not during at same Mesh network, described boundary node and described neighbor networks node carry out borde gateway negotiation, determine borde gateway.
Border MP node fictionalizes MP entity and supports to create intercommunication link with neighbor networks, and carrys out this virtual MP entity of unique identification by new MAC Address.
Boundary node is initiated request for building link frame (Peer Link Open frame) to neighbor networks node.In this frame, carry intercommunication link identification, can identify with bit, this intercommunication link identification is used for carrying out borde gateway role negotiation, and this frame can be indicated the available network parameter of this MP simultaneously.Or the Mesh ID carrying in this frame, by this Mesh ID, determine whether opposite end can be borde gateway, when creating intercommunication link, if the Mesh ID that recipient receives is identical with own local Mesh network Mesh ID, represent that transmit leg can be borde gateway, otherwise can not.
Neighbor networks node, according to the information in the Peer Link Open frame of boundary node, if can set up link with it, responds, and sends Peer Link Confirm frame, and this frame can be indicated the network parameter of its selection.Complete the negotiation of borde gateway.
If the side in boundary node and described neighbor networks node listens to the other side's beacon frame, by a side who listens to, use Mesh ID and the ability information that the other side broadcasts out to create intercommunication link; Now the side of intercepting is borde gateway;
If boundary node and described neighbor networks node both sides listen to the other side's beacon frame, now need to carry out borde gateway negotiation.Both sides can send the request of Link Open frame and create intercommunication link, suppose that both sides can become borde gateway, corresponding bit position is 1, what now in Link Open frame, carry is Mesh ID and the ability information that opposite end Mesh network identity is corresponding, according to policy selection one side as borde gateway.For example, this strategy can be to select a node that MAC Address is large as borde gateway.
S204, described boundary node is the intercommunication link with described neighbor networks node by described borde gateway foundation.
Described boundary node has been set up the intercommunication link with neighbor networks by described neighbor networks node, can with the wireless intercommunication link of this and neighbor networks.After wireless intercommunication link establishment, by wireless intercommunication link, send data.
In embodiments of the present invention, describedly by wireless intercommunication link, send data and comprise: by wireless intercommunication link, carry out forwarding data in wireless mesh network; Or by wireless intercommunication link, carry out the outer forwarding data of net of wireless mesh network and neighbor networks.
The embodiment of the present invention by setting up intercommunication link between wireless mesh network, overcome wireless lead to adjacent networks still need multi-hop to gateway again by the defect of wired intercommunication, solved intercommunication node between the adjacent wireless mesh network in geographical position and can pass through the method for wireless link direct communication; Make between network interoperability methods more flexible, when using wireless intercommunication to forward jumping figure to be less than wired mode and to forward jumping figure, promoted the efficiency of data retransmission, reduced the empty overhead of data retransmission.
Embodiment tri-
Consult Fig. 2, the wireless mesh network structural representation that the present embodiment provides, wherein have two Mesh networks, each mesh net has a plurality of MP (Mesh Point, mesh network node) and a MPP (outlet of Mesh Point Portal mesh node).
As shown in Figure 3, the wireless mesh network communication method based on borde gateway of the embodiment of the present invention comprises the following steps:
S401, the identification information that boundary node receives the node broadcasts of neighbor networks (for example: beacon frame), (for example: Mesh id information) and corresponding ability information read identity information.
S402, boundary node determines whether described Mesh id information is the network identity of own present networks.
S403 searches in roaming list Roaming List, whether there has been described Mesh ID when network identity that described Mesh ID is not own present networks,
S404, if existed, has represented that neighbor networks has been set up intercommunication link therewith, the opposite end that further judgement sends beacon frame whether with oneself created intercommunication link, if it is needn't create again new link; If not triggering borde gateway role negotiation flow process.If there is not this Mesh ID in Roaming List, whether this fringe node will set up intercommunication link with opposite end network according to own ability information and intercommunication strategy decision, and ability information and intercommunication strategy can comprise the whether roaming agreement record between compatibility or each network etc. of security capabilities.
Border MP node fictionalizes MP entity and supports to create intercommunication link with neighbor networks, and carrys out this virtual MP entity of unique identification by new MAC Address, has increased borde gateway role negotiation process, and has created intercommunication link.
In creating the mutual frame of link, increase whether intercommunication link identification bit sign is intercommunication link; Whether identification nodes role can be borde gateway, and method has two kinds: (1) increases a borde gateway bit and represents whether transmit leg can be used as borde gateway.(2) according to the Mesh ID carrying in frame, decide whether opposite end can be borde gateway, when creating intercommunication link, if the MeshID that recipient receives is identical with own local Mesh network Mesh ID, represents that transmit leg can be borde gateway, otherwise can not.
If the success of intercommunication link establishment, is that corresponding informance adds in Roaming List by this Mesh ID, and the role of record oneself, such as being borde gateway etc.Borde gateway will support to activate a plurality of Mesh ID simultaneously.After intercommunication link establishment success, data retransmission between can directly netting by wireless intercommunication link.
In practical application, allow to create two intercommunication links, after link establishment success, more whether will delete one according to strategy decision.If so, both sides can consult to delete a link, and negotiation step, for sending Link Close frame, increases a cause value in the reason of this frame code, have represented to set up the intercommunication link repeating and have required to delete this.
In embodiments of the present invention, describedly by wireless intercommunication link forwarding data, comprise: by wireless intercommunication link, carry out forwarding data in wireless mesh network; Or by wireless intercommunication link, carry out the outer forwarding data of net of wireless mesh network and neighbor networks.
The embodiment of the present invention by setting up intercommunication link between wireless mesh network, overcome wireless lead to adjacent networks still need multi-hop to gateway again by the defect of wired intercommunication, solved intercommunication node between the adjacent wireless mesh network in geographical position and can pass through the method for wireless link direct communication; Make between network interoperability methods more flexible, when using wireless intercommunication to forward jumping figure to be less than wired mode and to forward jumping figure, promoted the efficiency of data retransmission, reduced the empty overhead of data retransmission.
Embodiment tetra-
Further, the embodiment of the present invention provides the wireless mesh network communication method based on borde gateway to create multi-hop link.If boundary node creates intercommunication link negotiation failure, boundary node can become borde gateway agency according to strategy decision, creates multi-hop intercommunication link realize intercommunication with other borde gateways; If borde gateway need to find other MP nodes also to become borde gateway, form borde gateway group and share forwarding data, alleviate the processing load of single-point equipment, boundary node also can be used as and creates multi-hop intercommunication link.The flow chart of the establishment multi-hop link of the wireless mesh network communication method based on borde gateway providing for the embodiment of the present invention as shown in Figure 4.
First, borde gateway is used new MAC Address to forward neighbours Mesh network information frame, for example, forward the Beacon frame of neighbor networks; Until find suitable borde gateway.Optionally, in forwarding beacon frame, can increase flag, identifying this beacon is neighbor networks beacon frame; Intermediate node receives after neighbor networks nodal information, according to self-ability and strategy decision, whether can be used as borde gateway or borde gateway agency; If can become borde gateway agency, record sends the upper hop node address of neighbor networks nodal information, and continues to forward neighbor networks nodal information; After can becoming the node M P N of borde gateway and receiving neighbor networks information, use Mesh ID and the ability information and transmit leg establishment intercommunication link of Mesh network #1; From borde gateway MP N, start according to the intercommunication link of the reverse establishment multi-hop of information forward-path like this.Optionally, consider that MPP node can directly carry out intercommunication by wired with neighbor networks, so MPP node can not respond this kind of neighbor networks information according to strategy decision.Optionally, owing to forwarding neighbor networks, can increase the empty overhead of local network, therefore, when forwarding this frame, can increase therein a jumping figure upper limit, when hop count reaches this thresholding, no longer forward.
After link establishment, can carry out data retransmission, below introduce the scene of data retransmission:
A mesh network can have one or more borde gateways; Borde gateway can be set up one or more single-hop intercommunication link with neighbours' boundary node; Neighbor networks node can be that a common netted node can be also a borde gateway.Borde gateway also can be acted on behalf of and be set up multi-hop intercommunication link and carry out data retransmission by borde gateway.
Intercommunication link form according to different, can produce different data forwarding paths, and data retransmission had both comprised that Mesh internetwork communication also comprises with the outer home domain of the net of neighbor networks and communicated by letter.The following is several typical data forwarding paths.
As shown in Figure 5, the schematic diagram of the single-hop intercommunication link forwarding data providing for the embodiment of the present invention, between netting by single-hop intercommunication link in Fig. 5 between data send, or forwarding data is to the home domain of neighbor networks.Local network MP is connected with opposite end borde gateway, forwarding data.Shown in Fig. 6, the schematic diagram of the multi-hop intercommunication link forwarding data that the embodiment of the present invention provides, local network MP is directly connected with [Dan gateway multi-hop by opposite end network edge MP, and this kind of edge MP of forwarding data need to support a plurality of MeshID simultaneously, is called borde gateway agency;
As shown in Figure 7, the borde gateway group that the embodiment of the present invention provides shares the schematic diagram of processing forward data.A plurality of borde gateways form borde gateway group, share the disposal ability that deal with data forwards to alleviate single-point equipment.Borde gateway 1 can be selected the data retransmission of partial mesh network 2 to borde gateway 2, thereby alleviating borde gateway 1 is the processing load of mesh network 1 data retransmission form by mesh network 2 data retransmission format conversion, change by borde gateway 2 and process, such as security algorithm conversion and QoS (service quality) mapping conversion processing etc.
Embodiment five
The embodiment of the present invention provides a kind of wireless mesh network communication equipment, in Mesh net, is wherein MP.This equipment is for carrying out the method for above-described embodiment.As shown in 8, the structured flowchart of embodiment of the present invention wireless mesh network communication equipment 80.
This wireless mesh network communication equipment 80 comprises:
Receiving element 801, for receiving the identification information of neighbor networks node broadcasts;
Whether judging unit 803, for netting at same Mesh according to the neighbor networks node of described identification information judgment and described this identification information of transmission;
Negotiation element 805, for when during not at same Mesh network, carrying out borde gateway negotiation with described neighbor networks node with described neighbor networks node, determines borde gateway;
Link establishment unit 807, forms borde gateway group for a plurality of borde gateways, shares the disposal ability that deal with data forwards to alleviate single-point equipment.
This device by setting up intercommunication link between wireless mesh network, overcome wireless lead to adjacent networks still need multi-hop to gateway again by the defect of wired intercommunication, solved intercommunication node between the adjacent wireless mesh network in geographical position and can pass through the method for wireless link direct communication; Make between network interoperability methods more flexible, when using wireless intercommunication to forward jumping figure to be less than wired mode and to forward jumping figure, promoted the efficiency of data retransmission, reduced the empty overhead of data retransmission.
Further, as another embodiment, the identification information of the reception neighbor networks node that described receiving element 801 receives comprises identity information and the ability information that receives neighbor networks node broadcasts.Negotiation element 805 comprises: the first sending module, for initiating request for building link frame to described neighbor networks node, in this request for building link frame, carry intercommunication link identification, and this intercommunication link identification is used for carrying out borde gateway role negotiation; The first receiver module, the request response frame sending for receiving neighbor networks node, determines borde gateway.
In another embodiment, negotiation element 805 comprises:
The second transmitting element, for initiating request for building link frame to described neighbor networks node, in this request for building link frame, carry Mesh sign, by this Mesh sign, determine whether opposite end can be borde gateway, if the Mesh that described neighbor networks node receives sign is identical with the Mesh sign of described neighbor networks node place Mesh network, described boundary node is borde gateway.
As further supplementing of embodiment, consult Fig. 9, equipment 80 also comprises maintenance of information unit 809, after the success of intercommunication link establishment, described message identification is added in roaming list.
Further again, if this equipment is by the mode implementation method embodiment of gateway proxy, this equipment also comprises: agent unit 811, sends identification information more definite borde gateway as borde gateway agency to neighbor node for described boundary node after carrying out borde gateway negotiation with described neighbor networks node.
Device in each embodiment by setting up intercommunication link between wireless mesh network, overcome wireless lead to adjacent networks still need multi-hop to gateway again by the defect of wired intercommunication, solved intercommunication node between the adjacent wireless mesh network in geographical position and can pass through the method for wireless link direct communication; Make between network interoperability methods more flexible, when using wireless intercommunication to forward jumping figure to be less than wired mode and to forward jumping figure, promoted the efficiency of data retransmission, reduced the empty overhead of data retransmission.
Claims (8)
1. a wireless mesh Mesh network communication method, is characterized in that, described method comprises:
Boundary node receives the identification information that neighbor networks node sends;
The neighbor networks node that sends this identification information according to described identification information judgment whether with described boundary node in same Mesh net;
When described neighbor networks node and described boundary node be not during at same Mesh network, described boundary node and described neighbor networks node carry out borde gateway negotiation, determine borde gateway;
Described boundary node is the intercommunication link with described neighbor networks node by described borde gateway foundation;
Wherein, described in carry out borde gateway negotiation, determine that borde gateway comprises:
Described boundary node is initiated request for building link frame to described neighbor networks node, in this request for building link frame, carries intercommunication link identification, and this intercommunication link identification is used for carrying out borde gateway role negotiation;
Receive the request response frame that neighbor networks node sends, determine borde gateway; Or
Described boundary node is initiated request for building link frame to described neighbor networks node, in this request for building link frame, carry Mesh sign, by this Mesh sign, determine whether opposite end can be borde gateway, if the Mesh that described neighbor networks node receives sign is identical with the Mesh sign of described neighbor networks node place Mesh network, described boundary node is borde gateway; Or
If the side in described boundary node and described neighbor networks node listens to the other side's identification information, a side who listens to is as borde gateway; Or
If described boundary node and described neighbor networks node both sides listen to the other side's identification information, both sides consult to select wherein a side as borde gateway.
2. the method for claim 1, is characterized in that, the identification information of described reception neighbor networks node comprises identity information and the ability information that receives neighbor networks node broadcasts.
3. the method for claim 1, it is characterized in that, described method also comprises: described boundary node and described neighbor networks node carry out after borde gateway negotiation, and described boundary node sends identification information as borde gateway agency to neighbor node and determines borde gateway again.
4. the method for claim 1, is characterized in that, described method also comprises:
After the success of intercommunication link establishment, described identification information is added in roaming list.
5. a wireless mesh network communication equipment, is characterized in that, described equipment comprises:
Receiving element, for receiving the identification information of neighbor networks node broadcasts;
Whether judging unit, for netting at same Mesh according to described identification information judgment and the neighbor networks node that sends this identification information;
Negotiation element, for when during not at same Mesh network, carrying out borde gateway negotiation with described neighbor networks node with described neighbor networks node, determines borde gateway;
Link establishment unit, for the intercommunication link with described neighbor networks node by described borde gateway foundation;
Wherein, described negotiation element comprises:
The first sending module, for initiating request for building link frame to described neighbor networks node, carries intercommunication link identification in this request for building link frame, and this intercommunication link identification is used for carrying out borde gateway role negotiation;
The first receiver module, the request response frame sending for receiving neighbor networks node, determines borde gateway; Or
Described negotiation element comprises:
The second transmitting element, for initiating request for building link frame to described neighbor networks node, in this request for building link frame, carry Mesh sign, by this Mesh sign, determine whether opposite end can be borde gateway, if the Mesh that described neighbor networks node receives sign is identical with the Mesh sign of described neighbor networks node place Mesh network, described communication equipment is borde gateway; Or
Described negotiation element specifically for:
If the side in described communication equipment and described neighbor networks node listens to the other side's identification information, a side who listens to is as borde gateway; Or
If described communication equipment and described neighbor networks node both sides listen to the other side's identification information, both sides consult to select wherein a side as borde gateway.
6. equipment as claimed in claim 5, is characterized in that, the identification information of the reception neighbor networks node that described receiving element receives comprises identity information and the ability information that receives neighbor networks node broadcasts.
7. equipment as claimed in claim 5, is characterized in that, described equipment also comprises:
Agent unit, for carrying out after borde gateway negotiation with described neighbor networks node, described communication equipment is acted on behalf of as borde gateway, sends identification information determine borde gateway again to neighbor node.
8. equipment as claimed in claim 5, is characterized in that, described equipment also comprises:
Maintenance of information unit, after the success of intercommunication link establishment, adds described identification information in roaming list.
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| CN102065511B (en) * | 2010-12-09 | 2013-10-23 | 北京星网锐捷网络技术有限公司 | Cross-mesh network communication method and mesh point device |
| WO2019183919A1 (en) * | 2018-03-30 | 2019-10-03 | 华为技术有限公司 | Method and apparatus for converged networking |
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| CN1209606A (en) * | 1997-08-26 | 1999-03-03 | 日本电气株式会社 | Device analog method |
| CN1761231A (en) * | 2004-10-15 | 2006-04-19 | 中国科学技术大学 | The construction method of the distributed dynamic cellular route of mobile self-grouping network |
| CN101483539A (en) * | 2008-01-07 | 2009-07-15 | 华为技术有限公司 | Method, path computing unit and system for obtaining path |
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| KR101245856B1 (en) * | 2006-09-29 | 2013-03-20 | 삼성전자주식회사 | Multi radio mesh network system and the control method that support radio communication standard more than different kind |
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| CN1209606A (en) * | 1997-08-26 | 1999-03-03 | 日本电气株式会社 | Device analog method |
| CN1761231A (en) * | 2004-10-15 | 2006-04-19 | 中国科学技术大学 | The construction method of the distributed dynamic cellular route of mobile self-grouping network |
| CN101483539A (en) * | 2008-01-07 | 2009-07-15 | 华为技术有限公司 | Method, path computing unit and system for obtaining path |
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