CN104980979B - Adaptive subnet switching method - Google Patents
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- CN104980979B CN104980979B CN201510376950.9A CN201510376950A CN104980979B CN 104980979 B CN104980979 B CN 104980979B CN 201510376950 A CN201510376950 A CN 201510376950A CN 104980979 B CN104980979 B CN 104980979B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
Abstract
The present invention relates to a kind of adaptive subnet switching methods, heartbeat detection information is sent by timing, it reads and Egress node that mouthful nodal distance obtains is separated out apart from subnet information table according to node, judge whether Egress node receives the heartbeat detection response message that network management center issues in corresponding preset time, if it is not, subnet where the node of subnet where Egress node is then switched to Egress node Egress node small with nodal distance second in subnet information table.New subnet is formed with the node in nearest neighbouring subnet, more excellent network is formed, communication quality is improved while to ensure that node can continue to work.According to the position where the position of Egress node and node, self-adaptation flexible networking is carried out, even if Egress node breaks down, passes through switch subnet, it is ensured that node normally connects network, existing resource is rationally utilized, to reduce the waste of resource.
Description
Technical field
The present invention relates to network transmission technologies, more particularly to a kind of adaptive subnet switching method.
Background technology
Equipment on the iron tower of power transmission line of national grid uses non-stop layer adhoc networks (self-organizing network), in electricity
When carrying out plurality of subnets data transmission on net power transmission line, due to the limitation of each node emission function, in long distance transmission, in subnet
Portion's node needs to send data to network management center by way of forwarded hop-by-hop, the signal frequency and IP network that each subnet uses
Section differs.Each node is operated in adhoc patterns in subnet, forms acentric ad-hoc network.Subnet internal node is all pair
Deng, each node has forwarding capability, one of node and wired connection as Egress node, other nodes are by data
It is transferred to Egress node.Multiple Egress nodes constitute the entire transmission network as shown in Fig. 5 by being wiredly connected to network management center
Network.During long distance transmission, multi-hop relay transmission causes bandwidth to reduce, and performance cannot be satisfied use demand.It needs in this way
It divides no subnet to be transmitted respectively, to ensure transmission quality.During multi-hop transmission, it may appear that individual relay nodes
The case where damage causes other nodes in subnet that can not normally access network, waste of resource.
It is existing that base station is transported to by one jump set of each station data using cellular mobile communication method.As shown in Fig. 6, stand
When o'clock being moved to the coverage area of another base station from the coverage area of a base station, handoff techniques are used to ensure data
Transmission.Handover be using between mobile site and base station uplink and downlink level quality and Timing Advance as master data,
Decide whether to switch according to handoff algorithms.According to the different switchings that can be divided into based on downlink signal quality of trigger parameter, it is based on
The switching of uplink and downlink signals level, the switching based on distance and the switching based on portfolio.All it is arranged in various switching methods
Corresponding handoff threshold.
However, the data transmission of cell mobile communication systems is a kind of centralized data transmission having center, it can not multi-hop
Relay transmission, the switching between different sub-network are established on the basis of website moves.Since equipment is erected on the steel tower of power transmission line,
Equipment can not move, if a base station cannot work, the node in this base station range can not be switched to another base
The case where coverage area stood, the then node in the base station range can not normally access network, waste of resource.
Invention content
Based on this, it is necessary to when being directed to data transmission on existing power grid electric wire the problem of the wasting of resources, provide a kind of energy conjunction
Reason utilizes the adaptive subnet switching method of existing resource.
A kind of adaptive subnet switching method, includes the following steps：
Timing sends heartbeat detection information；
The Egress node obtained with a distance from each Egress node according to node is read apart from subnet information table；
Judge whether the Egress node receives the heartbeat detection that network management center issues in corresponding preset time and answer
Answer information；
If it is not, the node of subnet where Egress node is then switched to the Egress node in subnet information table
Subnet where the Egress node small with the nodal distance second.
Above-mentioned adaptive subnet switching method further includes step in one of the embodiments,：
If receiving the heartbeat detection response message that network management center issues in the corresponding preset time, root
According to the heartbeat detection response message, the Egress node is updated apart from subnet information table；
The network segment of the node of subnet where judging the Egress node whether with the newer Egress node distance
It is consistent with the Egress node network segment of nodal distance minimum in subnet information table；
If it is determined that inconsistent, by the node switch to the newer Egress node in subnet information table with it is described
Subnet where the Egress node of nodal distance minimum.
Above-mentioned adaptive subnet switching method further includes step in one of the embodiments,：
Node subnet information is obtained, and the node subnet information is reported to network management center；
Receive the Egress node information table established according to the node subnet information that the network management center issues；
According to the Egress node information table, the node is calculated with a distance from the Egress node；
According to distance carry out sequence sequence from small to large, establishes and preserve the Egress node apart from subnet information
Table.
The heartbeat detection information includes the node subnet information in one of the embodiments,.
The heartbeat detection response message includes the Egress node information table in one of the embodiments,；It is described go out
Mouth informational table of nodes includes Egress node position coordinates.
Above-mentioned adaptive subnet switching method further includes step in one of the embodiments,：
Judge whether network management center receives the corresponding outlet in time threshold corresponding with the Egress node
The heartbeat detection information of node；
If so, updating the Egress node information table according to the node subnet information in the heartbeat detection information, concurrently
Send the heartbeat detection response message；
If it is not, the position coordinates of the corresponding Egress node are set as infinitely great, the Egress node information table is updated,
And send the heartbeat detection response message.
It is described according to the heartbeat detection response message in one of the embodiments, update the Egress node distance
The step of subnet information table includes：
According to the Egress node position coordinates of Egress node information table described in the heartbeat detection response message, more
The new node is with a distance from each Egress node；
According to the updated node with a distance from each Egress node, the Egress node is updated apart from subnet information
Table.
The node subnet information includes the node present channel frequency, the node in one of the embodiments,
The basic service set identification of subnet and the position coordinates of the node where the place subnet network segment, the node.
The Egress node includes that the Egress node is arranged by distance apart from subnet information table in one of the embodiments,
The serial number of sequence, the node are with a distance from the Egress node, subnet frequency, Egress node institute where the Egress node
In the basic service set identification of subnet where the subnet network segment and the Egress node.
Above-mentioned adaptive subnet switching method, when the Egress node in network can not access network, according to Egress node
Node in subnet where the Egress node of failure is switched to Egress node distance by the information in subnet information table
Node in subnet information table in subnet where the Egress node small with nodal distance second, with neighbouring subnet forms new son
Net forms more excellent network, communication quality is improved while to ensure that node can continue to work.According to the position of Egress node
And the position where node, self-adaptation flexible networking is carried out, even if Egress node breaks down, passes through switch subnet, it is ensured that
Node normally connects network, existing resource is rationally utilized, to reduce the waste of resource.
Description of the drawings
Fig. 1 is the flow chart of the adaptive subnet switching method of an embodiment；
Fig. 2 is the flow chart of the adaptive subnet switching method of another embodiment；
Fig. 3 is the sub-process figure in the adaptive subnet switching method of another embodiment；
Fig. 4 is the sub-process figure in the adaptive subnet switching method of another embodiment；
Fig. 5 is traditional networking schematic diagram；
Fig. 6 is Cellular Network Planning figure；
Fig. 7 is the networking schematic diagram that the adaptive subnet of an embodiment switches.
Specific implementation mode
Referring to Fig. 1, providing a kind of adaptive subnet switching method of embodiment, include the following steps：
S100：Timing sends heartbeat detection information.
In order to understand Egress node in time either with or without failure, heartbeat detection information is sent by Egress node timing,
When Egress node breaks down, Egress node cannot be communicated with network management center, to receive network management center's transmission
Heartbeat detection response message, when Egress node does not break down, Egress node and network management center's normal communication then export section
Point can receive the heartbeat detection response message of network management center's transmission after sending heartbeat detection information.
S200：The Egress node obtained with a distance from each Egress node according to node is read apart from subnet information table.
In node local data base, Egress node has been prestored apart from subnet information table.Node is saved from each outlet
The distance of point has differences, and Egress node is established apart from subnet information table, outlet with a distance from each Egress node according to node
Node is had recorded in nodal distance subnet information table with a distance from each Egress node.When the heartbeat for receiving network management center's transmission
After detecting response message, the Egress node is updated apart from subnet information table, i.e., more new node is with a distance from each Egress node.
S300：Judge whether Egress node receives the heartbeat detection that network management center issues in corresponding preset time and answer
Answer information.
If it is not, thening follow the steps：
S400：By the node of subnet where Egress node switch to Egress node in subnet information table with nodal distance
Subnet where second small Egress node.
The heartbeat detection that network management center issues whether is received in corresponding preset time by judging Egress node to answer
Answer information, it can be determined that Egress node is whether there is or not failure, when being not received by, then it represents that the Egress node breaks down, when
Egress node breaks down, then cannot receive the heartbeat detection response message that network management center issues, subnet where Egress node
In node cannot carry out normal communication with network management center, by the node of subnet where the Egress node switch to Egress node away from
Subnet, the outlet section that node passes through the subnet after switching where the Egress node small with nodal distance second in ion net information table
Point is communicated with network management center, and update Egress node is apart from subnet information table, and updated Egress node is in subnet information table
With the Egress node of nodal distance minimum be original Egress node in subnet information table with nodal distance second is small goes out
Mouth node, the node Egress node distance nearest with node in subnet information table with original Egress node become infinite
Greatly, i.e., out of order Egress node becomes infinitely great at a distance from node.
Above-mentioned adaptive subnet switching method, when the Egress node in network can not access network, according to Egress node
Node in subnet where the Egress node of failure is switched to Egress node distance by the information in subnet information table
Node in subnet information table in subnet where the Egress node small with nodal distance second, with neighbouring subnet forms new son
Net forms more excellent network, communication quality is improved while to ensure that node can continue to work.According to the position of Egress node
And the position where node, self-adaptation flexible networking is carried out, even if Egress node breaks down, passes through switch subnet, it is ensured that
Node normally connects network, existing resource is rationally utilized, to reduce the waste of resource.
Referring to Fig. 2, above-mentioned adaptive subnet switching method further includes step in one of the embodiments,：
If receiving the heartbeat detection response message that network management center issues in corresponding preset time, then follow the steps：
S500：According to heartbeat detection response message, update Egress node is apart from subnet information table.
When Egress node receives the heartbeat detection response message that network management center issues, there is shown event does not occur in mouth node
Barrier, with network management center's energy normal communication, according to heartbeat detection response message, update Egress node is apart from subnet information table, i.e., more
New node is from the distance between each Egress node.When node is switched to Egress node apart from subnet letter by S400 through the above steps
After subnet where ceasing Egress node small with nodal distance second in table, node and network management center's normal communication are examined according to heartbeat
Survey response message, the Egress node of more new node is apart from subnet information table, the Egress node of node and the subnet after switching at this time
Distance be nearest.
S600：Judge the node of subnet where Egress node the network segment whether with newer Egress node apart from subnet information
It is consistent with the Egress node network segment of nodal distance minimum in table；
If it is determined that it is inconsistent, it thens follow the steps：
S700：Node is switched into outlet section of the newer Egress node with nodal distance minimum in subnet information table
Subnet where point.
Egress node indicates and the nearest outlet of node in subnet information table with the Egress node of nodal distance minimum
Node, the network segment of node and identical as the Egress node network segment that node is nearest indicate that the Egress node of node and nearest neighbours exists
Same subnet, the network segment when node and, the outlet of expression node and nearest neighbours different from the Egress node network segment that node is nearest
Node difference is in same subnet.
When the network segment of node and different from the Egress node network segment that node is nearest, then need node switching to nearest neighbours
Egress node where subnet.On the one hand, when the Egress node of subnet where node does not break down, node is switched
To the subnet of nearest neighbours, that is, selects nearest Egress node place network to form subnet, ensure node from place subnet
The distance of Egress node is nearest, improves communication quality, on the other hand, when the Egress node of failure restores normal,
Node is minimum with normal Egress node distance is restored, and node is switched to and restores normal Egress node, is formed more excellent
Network.
Above-mentioned adaptive subnet switching method further includes step in one of the embodiments,：
Node subnet information is obtained, and node subnet information is reported to network management center.
Receive the Egress node information table established according to node subnet information that network management center issues.
According to Egress node information table, calculate node is with a distance from each Egress node.
According to node with a distance from each Egress node, establishes and preserve Egress node apart from subnet information table.
Each node establishes wireless self-networking, is divided into different subnets and is transmitted respectively, and the node inside subnet is all pair
Deng, each node has forwarding capability, and for one of node by wired connection network center, which is that outlet saves
Point, other nodes send data to Egress node, the data that Egress node sends subnet interior nodes by wire transmission extremely
Network management center.Different sub-network is gone out data transmission by the Egress node in subnet, and Egress node is by node subnet information
It is reported to network management center, network management center establishes Egress node information table after receiving node subnet information, and passes through Egress node
It is sent to each node, each node calculates this node with a distance from each Egress node, built according to distance according to Egress node information table
It stands and preserves Egress node apart from subnet information table.In the present embodiment, according to node with a distance from each Egress node from small
To big carry out sequence sequence, establishes and preserve Egress node apart from subnet information table.Pass through subnet where judging Egress node
Whether the primary outlet node network segment is consistent in subnet information table with updated Egress node for the network segment of node.
It is appreciated that can also the carry out sequence sequence from big to small with a distance from each Egress node according to node, establish and protect
Egress node is deposited apart from subnet information table, by the network segment of the node of subnet where judging Egress node whether with it is updated go out
The last one Egress node network segment is consistent in mouth nodal distance subnet information table.
Egress node includes sequence of the Egress node by distance-taxis apart from subnet information table in one of the embodiments,
Number, node is with a distance from Egress node, the subnet network segment and Egress node where subnet frequency, Egress node where Egress node
The basic service set identification of place subnet.
In one of the embodiments, node subnet information include node present channel frequency, the subnet network segment where node,
The basic service set identification of subnet and the position coordinates of node where node.
Heartbeat detection information includes node subnet information in one of the embodiments,.Heartbeat detection response message includes
Egress node information table, Egress node information table include Egress node position coordinates.
Referring to Fig. 3, above-mentioned adaptive subnet switching method further includes step in one of the embodiments,：
S110：Judge whether network management center receives corresponding Egress node in time threshold corresponding with Egress node
Heartbeat detection information；
If so, thening follow the steps：
S120：Egress node information table is updated according to the node subnet information in heartbeat detection information, and sends heartbeat inspection
Survey response message；
If it is not, thening follow the steps：
S130：The position coordinates of corresponding Egress node are set as infinitely great, update Egress node information table, and send the heart
Jump detection response message.
With or without the heartbeat detection information for receiving corresponding Egress node, above-mentioned judgment step can be all carried out again
S110 is the continuous process for repeating to judge.Corresponding outlet section is not received by time threshold corresponding with Egress node
The heartbeat detection information of point indicates that the Egress node breaks down, the position coordinates of corresponding Egress node is updated to infinite
Greatly, Egress node information table is updated, the heartbeat detection response message of transmission includes updated Egress node information table.At this
In specific embodiment, the corresponding time threshold of Egress node is more than the time interval for sending heartbeat detection information, this is in order to anti-
Only heartbeat detection information is not sent also, has just been had reached the corresponding time threshold of Egress node, has not been detected Egress node
Heartbeat detection information, finally judge that the Egress node breaks down, however, it is possible to the Egress node does not break down, only
Be send heartbeat detection information interval it is too long, do not have enough time also send, cause in this way judgement slip up.With Egress node
The heartbeat detection information that corresponding Egress node is received in corresponding time threshold indicates that event does not occur in the Egress node
Barrier updates Egress node information table according to heartbeat detection information interior joint subnet information.When the Egress node of failure restores
When normal, network management center can normally receive the heartbeat detection information of Egress node transmission, according in heartbeat detection information
The position coordinates of the Egress node are restored normal, to update Egress node information table by node subnet information by infinity.
Referring to Fig. 4, in one of the embodiments, according to heartbeat detection response message, update Egress node distance
The step S500 of net information table includes：
S510：According to the Egress node position coordinates of heartbeat detection response message middle outlet informational table of nodes, more new node
With a distance from each Egress node.
S520：According to updated node with a distance from each Egress node, update Egress node is apart from subnet information table.
Include Egress node information table in heartbeat detection response message, network management center can carry out Egress node information table
Then update sends heartbeat detection response message, according to the Egress node coordinate in Egress node information table, to node from respectively going out
The distance of mouth node is updated, then is updated apart from subnet information table to Egress node.
In order to understand Egress node in time either with or without failure, heartbeat detection information is sent by Egress node timing,
Network management center selects to update according to whether there is or not the heartbeat detection information for detecting corresponding Egress node within the corresponding time
Mouth informational table of nodes mode, retransmits heartbeat detection response message.When having received corresponding Egress node within the corresponding time
Heartbeat detection information, then the No way out node do not break down, when being not received by corresponding outlet within the corresponding time
The heartbeat detection information of node, then Egress node failure, the Egress node can not work, will be unable to receive in webmaster
The node of subnet where the Egress node is switched to Egress node apart from subnet information by the heartbeat detection response message that the heart issues
Subnet where the Egress node small with nodal distance second in table is normally logical with network management center in the subnet of node after handover
Letter, node become infinitely great with a distance from failure Egress node, become most at a distance from the Egress node of subnet where after switching
Small, Egress node is updated apart from subnet information table.
Below with an example to traditional plurality of subnets data transmission method, cellular mobile communication method and above-mentioned adaptive
Subnet switching method is subject to comparative illustration.
Referring to Fig. 5, subnet internal node is all reciprocity, each node has forwarding capability, one of node
With wired connection as Egress node, i.e. Egress node 3 and Egress node 8 by wired connection network management center, node 1,2,4 and
Node 5 sends data to Egress node 3, and node 6,7 and node 9 transfer data to Egress node 10.Wherein Mesh equipment
For wireless base station device, as customer access equipment.During long distance transmission, multi-hop relay transmission causes bandwidth to reduce,
Performance cannot be satisfied use demand.When the Egress node in subnet breaks down, other nodes will be unable to connection net in subnet
Network can not work, waste of resource.
Referring to Fig. 6, cellular mobile communication mode transports to base station by one jump set of each station data, wherein MS1~MS6
Respectively wireless base station device.When website is moved to the coverage area of another base station from the coverage area of a base station, use
Handoff techniques are a kind of centralized data transfer modes having center to ensure the transmission of data, can not multi-hop relay biography
Defeated, the switching between different sub-network is established on the basis of website moves.Since equipment is erected on the steel tower of power transmission line, equipment without
Method moves, if a base station cannot work, the node in this base station range can not be switched to covering for another base station
The case where lid range, the then node in the base station range can not normally access network, waste of resource.
Referring to Fig. 7, node A, B, D, E and Egress node C composition adhoc subnets one, node F, G, I, J and outlet section
Point H composition adhoc subnets two, node K, L, N, O and Egress node M composition adhoc subnets three.Egress node is from local data base
Network management center is reported to after middle acquisition node subnet information, network management center receives the node subnet letter that each Egress node reports
Egress node information table is established after breath, and Egress node information is handed down to by each node by Egress node, is believed according to Egress node
Table is ceased, egress is calculated and is ranked up with a distance from each Egress node, and according to the far and near size of distance, establish and preserve node
Apart from subnet information table.If Egress node H can not work in use, Egress node H can not be received under network management center
Node in subnet two where Egress node H is switched to Egress node apart from subnet information by the heartbeat detection response message of hair
Subnet where the Egress node small with nodal distance second in table, i.e., due to node F and node G and Egress node C distances second
Closely, by node F and node G by the node in the adhoc subnets one where being switched to Egress node C and in adhoc subnets one
New adhoc subnets are formed, data pass to network management center from Egress node C.Due to node I and node J and Egress node M distances
Second is close, by node I and node J by the section in the adhoc subnets three where being switched to Egress node M and in adhoc subnets three
Point forms new adhoc subnets, and data pass to network management center from Egress node M.
Network management center will be unable to detect the heartbeat detection message that Egress node H is sent, by the location information of Egress node H
Be set as infinitely great, the update of Egress node information table, in the adhoc subnets one of node F and node G after handover can in webmaster
The heart communicates, and can be communicated with network management center in the adhoc subnets three of node I and node J after handover.It is saved according to updated outlet
Point information table, update Egress node apart from subnet information table, updated Egress node in subnet information table with node F away from
To no longer be Egress node H from minimum Egress node, but Egress node C, updated Egress node is apart from subnet information
The Egress node minimum with node G distances will no longer be Egress node H in table, but Egress node C.Updated Egress node
The Egress node minimum with node I distances will no longer be Egress node H in subnet information table, but Egress node M, update
The Egress node minimum with node J distances in subnet information table of Egress node afterwards will no longer be Egress node H, but go out
Mouth node M.
If Egress node H resumes work, Egress node H can receive the heartbeat detection response letter that network management center issues
Breath, network management center can receive the heartbeat detection information that Egress node H is sent, according to the node subnet in heartbeat detection information
Information updates Egress node information table.After Egress node H is received in heartbeat detection response message, according to heartbeat detection response
The Egress node position coordinates of Egress node information table in information will carry out more Egress node apart from subnet information table again
Newly, node F, G, I and node J is minimum at a distance from original Egress node H respectively, by node F, G, I and node J switchings
To original adhoc subnets two.
In node A, B, D, E and Egress node C composition adhoc subnets one, node F, G, I, J and Egress node H compositions
After adhoc subnets two, node K, L, N, O and Egress node M composition adhoc subnets three, break down without Egress node, root
According to the heartbeat detection response message middle outlet informational table of nodes that network management center sends, update Egress node apart from subnet information table,
Whether the network segment of decision node is consistent with the Egress node network segment of nodal distance minimum in subnet information table with Egress node,
If inconsistent, illustrate that node is not nearest at a distance from the Egress node of the subnet where it is located, node is switched into first outlet
Subnet where node so that node is formed according to network where with a distance from Egress node, selecting immediate Egress node
Subnet.
Each technical characteristic of above example can be combined arbitrarily, to keep description succinct, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield is all considered to be the range of this specification record.
Only several embodiments of the present invention are expressed for above example, the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, these are all within the scope of protection of the present invention.
Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (7)
1. a kind of adaptive subnet switching method, which is characterized in that include the following steps：
Timing sends heartbeat detection information；
The Egress node obtained with a distance from each Egress node according to node is read apart from subnet information table；
Judge whether the Egress node receives the heartbeat detection response letter that network management center issues in corresponding preset time
Breath；
If it is not, the node of subnet where the Egress node is then switched to the Egress node in subnet information table
Subnet where the Egress node small with the nodal distance second；
The adaptive subnet switching method, further includes step：
If the heartbeat detection response message that network management center issues is received in the corresponding preset time, according to institute
Heartbeat detection response message is stated, updates the Egress node apart from subnet information table；
The network segment of the node of subnet where judging the Egress node whether with the newer Egress node apart from subnet
It is consistent with the Egress node network segment of nodal distance minimum in information table；
If it is determined that inconsistent, by the node switch to the newer Egress node in subnet information table with the node
Subnet where the minimum Egress node of distance；
The adaptive subnet switching method, further includes step：
Node subnet information is obtained, and the node subnet information is reported to network management center；
Receive the Egress node information table established according to the node subnet information that the network management center issues；
According to the Egress node information table, the node is calculated with a distance from each Egress node；
From small to large or carry out sequence sequence from big to small according to the distance, it establishes and preserves the Egress node apart from subnet
Information table.
2. adaptive subnet switching method according to claim 1, which is characterized in that the heartbeat detection information includes institute
State node subnet information.
3. adaptive subnet switching method according to claim 2, which is characterized in that the heartbeat detection response packet
Include the Egress node information table；The Egress node information table includes Egress node position coordinates.
4. adaptive subnet switching method according to claim 3, which is characterized in that further include step：
Judge whether the network management center receives the corresponding outlet in time threshold corresponding with the Egress node
The heartbeat detection information of node；
If so, updating the Egress node information table according to the node subnet information in the heartbeat detection information, and send institute
State heartbeat detection response message；
If it is not, the position coordinates of the corresponding Egress node are set as infinitely great, the Egress node information table is updated, concurrently
Send the heartbeat detection response message.
5. adaptive subnet switching method according to claim 4, which is characterized in that described to be answered according to the heartbeat detection
Information is answered, update the Egress node includes apart from the step of subnet information table：
According to the Egress node position coordinates of Egress node information table described in the heartbeat detection response message, institute is updated
Node is stated with a distance from each Egress node；
According to the updated node with a distance from each Egress node, the Egress node is updated apart from subnet information table.
6. adaptive subnet switching method according to claim 1, which is characterized in that the node subnet information includes institute
The basic service set identification of subnet where stating node present channel frequency, the subnet network segment, the node where the node and
The position coordinates of the node.
7. adaptive subnet switching method according to claim 1, which is characterized in that the Egress node is believed apart from subnet
Breath table includes the Egress node by the serial number of distance-taxis, the node with a distance from the Egress node, the outlet saves
The basic service set mark of subnet where the subnet network segment where subnet frequency, the Egress node where point and the Egress node
Know.
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