CN115665028A - Subnet fusion and subnet splitting method and system of mobile ad hoc network - Google Patents
Subnet fusion and subnet splitting method and system of mobile ad hoc network Download PDFInfo
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Abstract
The invention discloses a subnet fusion and subnet splitting method and system of a mobile ad hoc network, the subnet fusion method firstly selects control nodes in the subnet, under the non-synchronous state, the nodes of each subnet search the synchronous signals of the adjacent subnet, after any node receives the synchronous signals, the BCCH of the subnet which sends the synchronous signals is read, after the control node of the subnet receives the first BCCH, the BCCH is not received until the subnet is fused with the other subnet; the control node constructs a fusion control instruction, completes the fusion with the local subnet and the other subnet, and then reselects the control node; the invention can not influence the business traffic of the sub-networks when the sub-networks are fused, simultaneously avoids the time slot conflict in the sub-network fusion and improves the efficiency of the sub-network fusion.
Description
Technical Field
The invention relates to a subnet merging and splitting method and a subnet merging and splitting system, in particular to a subnet merging and splitting method and a subnet splitting system of a mobile ad hoc network.
Background
In the process of ad hoc network communication, a plurality of small subnets are established in different communication ranges by each node of the same subnet, and with the overall movement of the nodes, the subnets which are integrated into a whole by each small subnet in the same communication range are communicated with each other to form a research hotspot. In the prior art, subnet fusion is performed according to the information of a whole network topology structure, a geographical position and the like as fusion preconditions, the method firstly divides edge nodes by the geographical position, secondly divides fusion time slot groups on the edge nodes, and finally sends fusion frames for subnet fusion, but the method has an obvious defect that distance measurement needs to be performed by depending on a GPS (global positioning system), and the division of the time slot groups can influence the original service transmission of the subnet. In addition, the prior art also includes a subnet fusion method of different quasi-spider subnets in power line communication, but this method needs to disassemble another subnet and then re-network to the whole new large subnet when performing subnet fusion, which is not only slow in efficiency but also needs to stop the traffic of another subnet.
Disclosure of Invention
The invention aims to: the first purpose of the invention is to provide a subnet amalgamation and subnet splitting method of a mobile ad hoc network which does not affect the business traffic and avoids the time slot conflict; the invention provides a subnet fusion and subnet splitting system of a mobile ad hoc network.
The technical scheme is as follows: the invention relates to a subnet fusion and subnet splitting method of a mobile ad hoc network, wherein the subnet fusion comprises the following steps:
(1) Selecting the node with the minimum number of the node of the sub-network as a control node;
(2) Under the state of no synchronization, the nodes of each subnet search the synchronization signals of the adjacent subnet, and after any node receives the synchronization signals, the BCCH of the subnet which sends the synchronization signals is read;
(3) After receiving the first BCCH, the control node of the subnet does not receive the BCCH until the integration with the subnet of the other party is completed;
(4) The local subnet control node constructs a fusion control instruction according to the node number and the time offset of the other subnet, and completes the fusion with the local subnet and the other subnet;
(5) And re-electing the control node.
Further, after the control node election in step (1) is completed, broadcasting a control signaling heartbeat to the whole network at regular time, if any node in the subnet does not receive the control signaling heartbeat for 3 times continuously, determining that the control node is disconnected, and reselecting the control node.
Further, in the step (4), fusion time is determined according to the time offset, and a plurality of superframes are added after the fusion time to start adjusting the time difference for subnet fusion.
Further, the merging control instruction in step (4) includes determining a merging subnet and a merged subnet according to a merging policy, where the merging policy is: the subnet with less subnet nodes is a fused subnet, and the subnet with more subnet nodes is a fused subnet; if the number of the nodes of the sub-network is the same as that of the other sub-network, the sub-network with the smaller frame number is the fused sub-network, and the sub-network with the larger frame number is the fused sub-network.
Further, the converged subnet adjusts the time to be consistent with the time of the converged subnet according to the time offset.
Further, in step (3), the control node receives the first BCCH, which includes that the control node receives the BCCH of the subnet of the opposite party, and after the non-control node in the subnet receives the BCCH of the subnet of the opposite party, the control node in the subnet receives the BCCH forwarded by the non-control node.
Further, in the step (2), in a state where there is no synchronization, the node of each sub-network searches for a synchronization signal of the neighboring node with a priority lower than that of the traffic of the node.
Further, the subnet splitting comprises: the sub-network is split into a plurality of sub-networks because a plurality of nodes move to different communication ranges, and each node elects a control node again to finish the sub-network splitting.
The invention relates to a subnet fusion and subnet splitting system of a mobile ad hoc network, which comprises:
the control node election module is used for electing the node with the minimum number of the subnet nodes as a control node;
a blind search module, which is used for searching the synchronous signal of the adjacent node by the node of each sub-network under the state without synchronization, and reading the BCCH of the sub-network sending the synchronous signal after any node receives the synchronous signal; after receiving the first BCCH, the control node of the subnet does not receive the BCCH until the integration with the subnet of the other party is completed;
the subnet fusion module is used for constructing a fusion control instruction by the subnet control node according to the node number and the time offset of the subnet of the opposite side so as to complete the fusion with the subnet and the subnet of the opposite side;
and the subnet splitting module is used for splitting the plurality of nodes into a plurality of subnets when the plurality of nodes of the subnet move to different communication ranges.
The computer readable storage medium of the present invention stores a computer program, and when the computer program is executed by a processor, the computer program implements the subnet merging and subnet splitting method of the mobile ad hoc network.
Has the beneficial effects that: compared with the prior art, the invention has the advantages that: (1) The priority of blind search is set to be lower than the service priority, so that the service traffic of the sub-networks cannot be influenced during the fusion of the sub-networks; (2) The control node of the invention adjusts the state of subnet fusion to the state to be fused when receiving the first BCCH, thereby avoiding time slot conflict in subnet fusion; (3) The invention does not need to dissolve the subnet, adjusts the time of the fused subnet to be the same as the fused subnet at the same time point, and improves the efficiency of subnet fusion; (4) The invention is generally applicable to mobile ad hoc networks based on time division multiplexing and each node sends a BCCH (the BCCH has SYNC information and each node sends the information on a fixed time slot) once in a superframe.
Drawings
Fig. 1 is a flow chart of subnet fusion according to the present invention.
Fig. 2 is a diagram of a subnet convergence process in the embodiment of the present invention.
Fig. 3 is a flowchart of a control node broadcasting data to the whole network in the embodiment of the present invention.
Fig. 4 is a schematic diagram of blind timeslot search according to an embodiment of the present invention.
Fig. 5 is a diagram of a subnet splitting process in an embodiment of the invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the subnet merging and subnet splitting include the following:
(1) Electing a control node in each small subnet:
(1a) The election of the control node is a convergence process, the control node is converged to the node with the minimum MACID (node number of the node) of the sub-network according to the network access condition of each small sub-network, and if the node does not have network access, the control node is selected as the control node;
(1b) After the control node election is finished, control signaling heartbeat is broadcasted to the whole network at regular time, if any node in the subnet does not receive the control signaling heartbeat for 3 times continuously, the control node is considered to be disconnected, and the control node election is initiated again.
(2) Blind searching among networks:
blind search refers to a process of searching for SYNC (synchronization signal, each node sends the signal once in a superframe to facilitate adjustment of time offset in the subnet) signals of neighboring nodes by nodes of each subnet to acquire synchronization time offset between the two nodes in a non-synchronization state. Since the blind search is performed in a non-synchronized state, the longer the search time is, the greater the possibility of acquiring the SYNC signal of the neighboring node is.
The nodes of the other party need to be found by maintaining blind search among the subnets, but in order to not influence the self service of the nodes in the subnets, the priority of the blind search is lower than the self service priority, namely the blind search is carried out on the premise of completing the self service. Because all nodes in the sub-networks have blind searching mechanisms, theoretically, two sub-networks in the same communication range are bound to have nodes capable of finding the SYNC signals of the sub-networks of the other side.
And if any node in the subnet receives the SYNC signal of the adjacent subnet, calculating the time offset according to the SYNC signal. And obtaining the time slot position of sending BCCH (broadcast control channel) by the node sending the SYNC signal according to the time offset, and then reading the BCCH at the position.
(3) Subnet convergence collision avoidance:
the problem of conflict that two subnets are fused to the other subnet simultaneously needs to be solved in the subnet fusion process, and meanwhile, the fusion can be also completed when the subnets discover the other subnet unidirectionally;
if the BCCH of the adjacent node of the subnet of the opposite side is read during blind search in the step (2), judging whether the node is a control node or not, if so, analyzing the BCCH information to obtain time offset and the node number of the subnet of the opposite side, and determining whether to initiate subnet fusion or not and the time point of the subnet fusion according to the node number of the subnet of the opposite side and the time offset; if not, the message is forwarded to the control node.
When the control node receives the first BCCH, the state of subnet fusion is adjusted to be a state to be fused, and the BCCH of the other subnet adjacent node sent by other nodes is not received any more. And after the fusion is finished, switching the state back to the fusion state, and recovering the receiving of the BCCH of the adjacent node of the adjacent subnet.
(4) Subnet fusion:
in the step (3), the control node of the subnet acquires the node number of the subnet of the opposite side and the time offset of the subnet of the opposite side according to the BCCH, and the control node starts to construct a fusion control instruction according to the two parameters;
(4a) Constructing a fusion instruction, namely firstly fusing a small number of sub-network nodes with a large number of sub-network nodes, and fusing a slow time and a fast time if the number of nodes is the same, namely fusing a small number of frame and a large number of frame;
(4b) Step (4 a) determines the fused policy, and then adds the policy result and the calculated time offset to the fusion instruction. Finally, determining the fusion time of the sub-network, considering the time delay of the multi-hop node in receiving the fusion instruction of the control node, and adding 6 super frames (about 3 seconds per super frame) to start adjusting the time difference for sub-network fusion after determining the fusion time point according to the service condition of the sub-network;
(4c) After the fusion instruction is constructed, the control node broadcasts the information in the whole subnet;
(4d) When the whole subnet network receives the fusion instruction of the control node, the policy assumed to be obtained in this embodiment is that the subnet is fused to the neighboring subnet, and then all nodes of the subnet add a subnet fusion task according to the time difference brought by the fusion instruction and the time point for starting fusion;
(4e) When the fusion time point arrives, all the nodes of the local subnet adjust the time of the local node according to the time difference, and the time of the local subnet is consistent with that of the other subnet after the time adjustment is completed.
(5) Updating the routing information:
(5a) Step (4) time synchronization is completed, and under the state of time synchronization, the service information of the two small subnetworks can be received by the opposite side; according to the routing service information of the subnet of the opposite side, the routing information of the whole network can be obtained;
(5b) And (5 a) re-electing the control nodes according to the MACIDs of the whole networks provided by the routes, and completing subnet fusion if the election of the control nodes is completed.
(6) Subnet splitting:
(6a) Subnet splitting is a node originally in the same subnet, which results in the node splitting into several different small subnets as some nodes move into different communication ranges.
(6b) And (3) after the sub-network is split into a plurality of sub-networks, the heartbeat signaling of the original control node cannot be accepted, and the control node election process is triggered, wherein the specific process is in the step (1).
(6c) And when the control node election is completed, the subnet splitting is completed.
The method of the invention is demonstrated below by way of example.
And step 1, electing a control node.
And step 2, broadcasting control node information to the sub-network by the selected control node, and sending control signaling heartbeat at regular time. As shown in fig. 3, in the subnet, the control node A1 broadcasts control node information and sends a control signaling heartbeat to the non-control nodes of the subnet according to the arrow sequence of (1) to (3), and if the subnet does not receive the control signaling for 3 consecutive times after generating the control node, the subnet is regarded as a control node drop, and a new control node is reselected.
And 2, blind searching among networks.
And step 2, judging whether sync of the adjacent subnet can be searched blindly, wherein A2 and A4 are within a communication range as shown in FIG. 2, and theoretically, the A2 and A4 can find each other by blindly searching.
And step 3, fusing.
A2, A4 in fig. 2 find the counterpart subnet as shown by arrows (1) - (3) in fig. 2; suppose that the subnet 1 is determined to start merging to the subnet 2 according to the time offset and the subnet size of the other party.
Firstly, the BCCH received by A2 is sent to the control node A1, and after A1 determines the merging time, the BCCH is broadcasted to the subnet 1, as shown by the arrows (4) and (5) in fig. 2; after the broadcasting is finished, all nodes in the subnet carry out time adjustment at a uniform time point.
After the time adjustment is completed, the time of the sub-network 1 and the sub-network 2 is synchronized, and when all the nodes in the two sub-networks send own signaling in a specific time slot, each node can receive the signaling. When all nodes in the sub-network receive the signaling, the service can be received according to the service announced by the signaling.
And 4, updating the route and reselecting the control node.
After the time synchronization of the two sub-networks, all nodes of the whole network of the broadcasted routing information can receive the routing information, and the routing is updated. And according to the control node selection process, re-triggering control node election. And after the control node is selected, the subnet integration is finished.
And 5, subnet splitting.
As shown in fig. 5, the two subnets are not in the same communication range, and are divided into two subnets, and then respective control nodes are selected, so that the subnet splitting is completed. The control nodes of the two subnets in fig. 5 are A1, A4, respectively.
Based on the same inventive concept, the subnet fusion and subnet splitting system of the mobile ad hoc network comprises:
the control node election module is used for electing the node with the smallest subnet node number as the control node;
the blind searching module is used for searching the synchronous signals of the adjacent nodes by the nodes of each sub-network in a non-synchronous state, and reading the BCCH of the sub-network for sending the synchronous signals after any node receives the synchronous signals; after receiving the first BCCH, the control node of the subnet does not receive the BCCH until the integration with the subnet of the other party is completed;
the subnet fusion module is used for constructing a fusion control instruction by the subnet control node according to the node number and the time offset of the subnet of the opposite side so as to complete the fusion with the subnet of the opposite side;
and the subnet splitting module is used for splitting the plurality of nodes of the subnet into a plurality of subnets when the plurality of nodes move to different communication ranges.
Based on the same inventive concept, the computer readable storage medium of the present invention stores a computer program, and the computer program is executed by a processor to implement the subnet merging and subnet splitting method of the mobile ad hoc network.
Claims (10)
1. A subnet fusion and subnet splitting method of a mobile ad hoc network is characterized in that the subnet fusion comprises the following steps:
(1) Selecting the node with the minimum number of the node of the sub-network as a control node;
(2) Under the state of no synchronization, the nodes of each subnet search the synchronization signals of the adjacent subnet, and after any node receives the synchronization signals, the BCCH of the subnet which sends the synchronization signals is read;
(3) After receiving the first BCCH, the control node of the subnet does not receive the BCCH until the integration with the subnet of the other party is completed;
(4) The local subnet control node constructs a fusion control instruction according to the node number and the time offset of the opposite subnet, and completes the fusion with the local subnet and the opposite subnet;
(5) And re-electing the control node.
2. The method for subnet integration and subnet splitting of a mobile ad hoc network according to claim 1, wherein after the control node election in step (1) is completed, a control signaling heartbeat is broadcasted to the whole network at regular time, and if any node in the subnet does not receive the control signaling heartbeat for 3 consecutive times, it is determined that the control node is disconnected, and the control node is elected again.
3. The method according to claim 1, wherein in step (4), the merging time is determined according to the time offset, and a plurality of superframes are added after the merging time to start adjusting the time difference for merging the subnets.
4. The subnet merging and subnet splitting method of a mobile ad hoc network according to claim 1, wherein the merging control command in step (4) comprises determining a merged subnet and a merged subnet according to a merging policy, and the merging policy is: the subnet with less subnet nodes is a fused subnet, and the subnet with more subnet nodes is a fused subnet; if the number of the nodes of the sub-network is the same as that of the other sub-network, the sub-network with the smaller frame number is the fused sub-network, and the sub-network with the larger frame number is the fused sub-network.
5. The method of subnet fusion and subnet splitting of a mobile ad-hoc network according to claim 4, wherein the time of the fusing subnet is adjusted to be consistent with the time of the fused subnet according to a time offset.
6. The subnet merging and subnet splitting method of the mobile ad hoc network as claimed in claim 1, wherein in step (3), the control node receives the first BCCH, which includes that the control node receives the BCCH of the subnet of the opposite party, and after the non-control node in the subnet receives the BCCH of the subnet of the opposite party, the control node in the subnet receives the BCCH forwarded by the non-control node.
7. The subnet merging and subnet splitting method of a mobile ad hoc network according to claim 1, wherein in the step (2), in a state without synchronization, the nodes of each subnet search for the priority of the synchronization signal of the neighboring node to be lower than the priority of the traffic of the node.
8. The subnet merging and subnet splitting method of a mobile ad hoc network according to claim 1, wherein the subnet splitting comprises: the sub-network is split into a plurality of sub-networks because a plurality of nodes move to different communication ranges, and each node elects a control node again to finish the sub-network splitting.
9. A subnet fusion and subnet splitting system of a mobile ad hoc network is characterized by comprising:
the control node election module is used for electing the node with the minimum number of the subnet nodes as a control node;
the blind searching module is used for searching the synchronous signals of the adjacent nodes by the nodes of each sub-network in a non-synchronous state, and reading the BCCH of the sub-network for sending the synchronous signals after any node receives the synchronous signals; after receiving the first BCCH, the control node of the subnet does not receive the BCCH until the integration with the subnet of the other party is completed;
the subnet fusion module is used for constructing a fusion control instruction by the subnet control node according to the node number and the time offset of the subnet of the opposite side so as to complete the fusion with the subnet and the subnet of the opposite side;
and the subnet splitting module is used for splitting the plurality of nodes of the subnet into a plurality of subnets when the plurality of nodes move to different communication ranges.
10. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the subnet fusion and subnet splitting method of a mobile ad hoc network according to any one of claims 1 to 8.
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