CN104486812B - A kind of ship movement ad hoc networks system, network-building method and method of work - Google Patents
A kind of ship movement ad hoc networks system, network-building method and method of work Download PDFInfo
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- CN104486812B CN104486812B CN201410684480.8A CN201410684480A CN104486812B CN 104486812 B CN104486812 B CN 104486812B CN 201410684480 A CN201410684480 A CN 201410684480A CN 104486812 B CN104486812 B CN 104486812B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
- H04W40/248—Connectivity information update
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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Abstract
The invention discloses a kind of ship to move ad hoc network systems, comprising：Ship moves ad hoc networks and several AIS terminals to communicate by ship movement ad hoc networks, each AIS terminals are connected the information exchange for realizing AIS terminal rooms with ship movement ad hoc networks, wherein the VHF radio station of the AIS terminals are set to the physical layer of ship movement ad hoc networks；The SOTDMA agreements of the AIS terminals are set to the MAC layer of ship movement ad hoc networks.The invention also discloses a kind of network-building method of ship movement ad hoc networks and the method for work of ship movement ad hoc networks.The present invention is according to the characteristics of ship formation group-net communication, the network control message of minimum number is added in existing AIS terminals, network control message is parsed using heuristic, the network for carrying out ship formation is established and network operation process, the ship for being loaded with AIS terminals is set to possess ad hoc network function, communication link can be established with any AIS terminals in fleet, interactive information, exchanges each other's needs.
Description
Technical field
The present invention relates to ship wireless communication field, and in particular to a kind of ship movement ad hoc networks system, networking side
Method and method of work.
Background technology
With the fast development of China market economy and global trade, maritime traffic is also quickly grown, ships quantity and ship
Oceangoing ship speed is all continuously improved, and causes maritime traffic density to be also continuously increased, to ship collision prevention, harbor traffic management and navigation safety
Propose new requirement.Automatic recognition system (automatic identification system, AIS) is International Maritime group
Knit the common achievement in research of (IMO), International Association of Lighthouse Authorities (IALA), International Telecommunication Union (ITI-R).AIS is in maritime affairs VHF frequencies
Section, is modulated using GMSK/FM, launches accommodation, the speed of a ship or plane, course, name of vessel, identification in a manner of SOTDMA (self-organizing time division multiple acess)
The ships such as code, captain, the beam move the shipborne system of static data.AIS can improve the navigation safety of ship, reduce ship collision
Possibility, and can help to search and rescue that ship is more preferable, is more quickly completed marine salvage task.End 2012 bottoms, the whole nation it is coastal and
Inland river has nearly 20,000 ships and is equipped with AIS equipment.But AIS systems only define the data interaction strategy of physical layer and MAC layer,
Network effective coverage range only limits a hop neighbor node, the applications such as collaboration supply of forming into columns to fairly large ship, collaboration are searched and rescued
Scene, lacks the overall control and information exchange ability of overlay network.
Ship movement ad hoc networks (Shipping Mobile Ad hoc network, SMANET) have become ship and have compiled
One of hot issue in team's control research.Compared with single ship, SMANET has stronger fault-tolerance by the cooperation of more ships
And adaptability, fleet can form dynamic network, pass through quickly and accurately interactive ship of sharing out the work and help one another between each ship under sail
The environmental information of team region, so as to accelerate system task completion, improves system work efficiency.
Mainly have for SMANET systematic researches both at home and abroad at present following some：The bottom knot of ship ad hoc systems
The structure coordination system；The scene application study of ship ad hoc systems；The bank station system such as ship terminal and 3GPP LTE, 802.11p
Information interacting method；Routing algorithm based on positional information and its applied in marine system.
The content of the invention
It is an object of the invention to provide a kind of ship movement ad hoc networks system, network-building method and method of work, root
The characteristics of according to ship formation group-net communication, the network control message of minimum number is added in existing AIS terminals, utilization is heuristic
Method parses network control message, carries out network foundation and the network operation process of ship formation, makes the ship for being loaded with AIS terminals
Possess ad hoc network function, communication link can be established with any AIS terminals in fleet, interactive information, exchanges each other's needs.
In order to achieve the above object, the present invention is achieved through the following technical solutions：A kind of ship movement ad hoc networks system
System, its main feature is that, comprising：
Ship moves ad hoc networks and several AIS ends to communicate by ship movement ad hoc networks
End, each AIS terminals are connected the information exchange for realizing AIS terminal rooms with ship movement ad hoc networks, wherein
The VHF radio station of the AIS terminals are set to the physical layer of ship movement ad hoc networks；
The SOTDMA agreements of the AIS terminals are set to the MAC layer of ship movement ad hoc networks.
A kind of network-building method of ship movement ad hoc networks, its main feature is that, comprise the steps of：
A1, AIS terminal radio network connection matrix within each AIS cycles, and by neighbours AIS terminal rooms constantly
Information exchange updates network connection matrix；
A2, after all AIS terminals complete information exchange to each other in system, network connection matrix update finishes, often
One AIS terminals obtain the topological connection relation of whole network, complete networking；
A3, AIS terminal-pair network connection matrix carry out topology information parsing using heuristic, and generation one is with local
Node is the spanning tree of root as routing table；
A4, AIS terminal utilize transmission and forwarding of the source-routed protocol according to routing table into row information.
The network-building method of ship movement ad hoc networks further includes slow networking AIS terminals and adds ship movement ad hoc
The step of network, slow networking AIS terminals receive the network connection matrix of its neighbours' AIS terminal broadcast, obtain opening up for whole network
Connection relation is flutterred, is completed into network process.
The step of network-building method of ship movement ad hoc networks further includes network operation, when the Topology connection of network
Relation changes, that is, has new AIS terminals to network or when original AIS terminals are left, neighbours AIS terminals can be at next AIS weeks
Interim renewal network connection matrix, is sent to whole network, the local spanning tree of other AIS terminals will phase by spot broadcasting
It should change, after all AIS terminals complete information exchange to each other, network operation process terminates.
The heuristic carries out the step of topology information parsing and includes：
B1, AIS terminal preserve its neighbours' AIS terminal to routing table；
B2, judge newly to add the number of neighbours' AIS terminals of the AIS terminals of routing table；
If zero, then terminate analyzing step；
If not zero, then perform step B3；
B3, ship information interactive system generate a forward link according to the neighbours AIS terminals newly added；
B4, judge whether neighbours' AIS terminals of new AIS terminals occur in forward link；
If so, then terminate analyzing step；
If it is not, step B2 then will be performed after the neighbours AIS terminals write-in routing table of new AIS terminals.
The network connection matrix is symmetrical matrix.
The AIS cycles are 1 minute.
The generation step of the spanning tree includes：
The root AIS terminals of C1, local AIS terminals as spanning tree；
The sub- AIS terminals of the first generation of C2, the neighbours AIS terminals of local AIS terminals as root AIS terminals；
C3, the sub- AIS terminals to each new addition, the sub- AIS terminals not occurred in the limb of the AIS terminals are made
For the sub- AIS terminals of future generation of the AIS terminals；
C4, when the AIS terminals for newly adding spanning tree for it is empty when, terminate the generation step of spanning tree.
A kind of method of work of ship movement ad hoc networks, its main feature is that, comprise the steps of：
The each AIS periodic broadcastings network connection matrix of S1, AIS terminal；
S2, other AIS terminals are updated network connection matrix after receiving, and generate a life using local node as root
Cheng Shu；
S3, AIS terminal room network connection matrix interactively with each other；
S4, when interaction cycle number is more than or equal to network maximum hop count, each AIS terminals will obtain opening up for whole network
Connection relation is flutterred, completes route establishment process；
S5, when thering are new AIS terminals to add or original AIS terminals are left, the whole network is notified by the interaction of network connection matrix, it is complete
Into network maintenance process.
The present invention a kind of ship movement ad hoc networks system, network-building method and method of work have compared with prior art
Advantages below：According to the characteristics of ship formation group-net communication, the network control letter of minimum number is added in existing AIS terminals
Breath, network control message is parsed using heuristic, is carried out network foundation and the network operation process of ship formation, is made to be loaded with
The ship of AIS terminals possesses ad hoc network function, can establish communication link, interactive information, intercommunication with any AIS terminals in fleet
Whether there is.
Brief description of the drawings
Fig. 1 is the overall structure diagram that a kind of ship of the present invention moves ad hoc network systems；
Fig. 2 is exemplary topology diagram；
Fig. 3 is network connection matrix schematic diagram；
Fig. 4 is the network-building method that a kind of ship of the present invention moves ad hoc networks；
Fig. 5 is the flow chart that heuristic carries out topology information parsing；
Fig. 6 is the generation method flow chart of spanning tree；
Fig. 7 is the method for work that a kind of ship of the present invention moves ad hoc networks.
Embodiment
Below in conjunction with attached drawing, by describing a preferable specific embodiment in detail, the present invention is further elaborated.
As shown in Figure 1, a kind of ship movement ad hoc network systems, comprising：Ship moves ad hoc networks and passes through institute
State several AIS terminals that ship movement ad hoc networks communicate, each AIS terminals and ship movement ad hoc
The information exchange of AIS terminal rooms is realized in network connection, wherein the VHF radio station of the AIS terminals are set to ship movement ad hoc nets
The physical layer of network；The SOTDMA agreements of the AIS terminals are set to the MAC layer of ship movement ad hoc networks；In the network of system
The control information of minimum data amount is added in layer, by designing didactic method for routing, the ship for making to be loaded with AIS terminals possesses
Ad hoc network function, can establish communication link interactive information with fleet's interior joint.AIS terminals need interactive accommodation, boat in itself
The ships such as speed, course, name of vessel, identification code, captain, the beam move static data, for realize system group network communication function, it is necessary to
The spare field of AIS sends route test information, to carry out the Route establishment of network layer and route maintenance procedure.Due to AIS
There is uncertainty in load number, to ensure effective work of system network network layers, network control message should be minimized, easy to it
Carried out incidentally in AIS terminals.
The topological structure of network in fleet's operation process constantly converts, and different is topological by the different network of correspondence
Control information.To reduce influence of fleet's change in topology to grid topology information, topology is cured using network connection Matrix C
Information content.In network topology structure as shown in Figure 2, its network connection matrix neighbours are as shown in Figure 3.In network connection matrix
Element（I represents row, and j represents row）Represent that there are a communication link between node i and node j；Represent
Link is not present.After the received network connection matrix of node, you can obtain the connection relation of whole network topology.Connection matrix C
It is symmetrical matrix,.So can only transmission network in order to reduce information content in network connection matrix interaction
The upper triangular matrix or lower triangular matrix of connection matrix are as shown in figure 3, the quantity of transmission information is, wherein N is
The quantity of AIS terminals in network.
As shown in figure 4, the network-building method of ship movement ad hoc networks, i.e. route establishment process, comprise the steps of：
A1, AIS terminal are in each AIS cycles（1 minute）Interior radio network connection matrix, and pass through neighbours' AIS terminals
Between constantly information exchange renewal network connection matrix；
A2, after all AIS terminals complete information exchange to each other in system, network connection matrix update finishes, often
One AIS terminals obtain the topological connection relation of whole network, complete networking；
A3, AIS terminal-pair network connection matrix carry out topology information parsing using heuristic, and generation one is with local
Node is the spanning tree of root as routing table；
A4, AIS terminal utilize transmission and forwarding of the source-routed protocol according to routing table into row information.
The step of slow networking AIS terminals add ship movement ad hoc networks is further included, slow networking AIS terminals receive
The network connection matrix of its neighbours' AIS terminal broadcast, obtains the topological connection relation of whole network, completes, into network process, late to enter
The network entry time for netting AIS terminals is an AIS cycle（1 minute）.
The step of further including network operation, when the topological connection relation of network changes, that is, has new AIS terminals
When networking or original AIS terminals are left, neighbours AIS terminals can be in next AIS cycles（1 minute）Middle renewal network connection square
Battle array, whole network is sent to by spot broadcasting, and the local spanning tree of other AIS terminals will be changed accordingly, when all AIS are whole
After information exchange to each other is completed at end, network operation process terminates, so influence of the network topology change to network is also one
A AIS cycles（1 minute）.
Included as shown in figure 5, the heuristic carries out the step of topology information parsing：
B1, AIS terminal preserve its neighbours' AIS terminal to routing table；
B2, judge newly to add the number of neighbours' AIS terminals of the AIS terminals of routing table；
If zero, then terminate analyzing step；
If not zero, then perform step B3；
B3, ship information interactive system generate a forward link according to the neighbours AIS terminals newly added；
B4, judge whether neighbours' AIS terminals of new AIS terminals occur in forward link；
If so, then terminate analyzing step；
If it is not, step B2 then will be performed after the neighbours AIS terminals write-in routing table of new AIS terminals.
As shown in fig. 6, the generation step of the spanning tree includes：
The root AIS terminals of C1, local AIS terminals as spanning tree；
The sub- AIS terminals of the first generation of C2, the neighbours AIS terminals of local AIS terminals as root AIS terminals；
C3, the sub- AIS terminals to each new addition, the sub- AIS terminals not occurred in the limb of the AIS terminals are made
For the sub- AIS terminals of future generation of the AIS terminals；
C4, when the AIS terminals for newly adding spanning tree for it is empty when, terminate the generation step of spanning tree.
As shown in fig. 7, a kind of method of work of ship movement ad hoc networks, comprises the steps of：
S1, AIS terminal each AIS cycles（1 minute）Radio network connection matrix；
S2, other AIS terminals are updated network connection matrix after receiving, and generate a life using local node as root
Cheng Shu；
S3, AIS terminal room network connection matrix interactively with each other；
S4, when interaction cycle number is more than or equal to network maximum hop count, each AIS terminals will obtain opening up for whole network
Connection relation is flutterred, completes route establishment process；
S5, when thering are new AIS terminals to add or original AIS terminals are left, the whole network is notified by the interaction of network connection matrix, it is complete
Into network maintenance process.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. a kind of network-building method of ship movement ad hoc networks, it is characterised in that comprise the steps of：
A1, AIS terminal radio network connection matrix within each AIS cycles, and pass through neighbours AIS terminal rooms constantly information
Interactive refreshing network connection matrix；
A2, after all AIS terminals complete information exchange to each other in system, network connection matrix update finishes, every AIS
Terminal obtains the topological connection relation of whole network, completes networking；
A3, AIS terminal-pair network connection matrix carry out topology information parsing using heuristic, and generation one is with local node
For root spanning tree as routing table；
A4, AIS terminal utilize transmission and forwarding of the source-routed protocol according to routing table into row information.
2. network-building method as claimed in claim 1, it is characterised in that further include slow networking AIS terminals and add ship shifting
The step of dynamic ad hoc networks, slow networking AIS terminals receive the network connection matrix of its neighbours' AIS terminal broadcast, obtain whole
The topological connection relation of network, is completed into network process.
3. network-building method as claimed in claim 1 or 2, it is characterised in that the step of further including network operation, works as network
Topological connection relation change, that is, there are new AIS terminals to network or when original AIS terminals are left, neighbours AIS terminals can be under
Network connection matrix is updated in one AIS cycle, whole network is sent to by spot broadcasting, the local of other AIS terminals is raw
Will accordingly it be changed into tree, after all AIS terminals complete information exchange to each other, network operation process terminates.
4. network-building method as claimed in claim 1, it is characterised in that the heuristic carries out topology information parsing
Step includes：
B1, AIS terminal preserve its neighbours' AIS terminal to routing table；
B2, judge newly to add the number of neighbours' AIS terminals of the AIS terminals of routing table；
If zero, then terminate analyzing step；
If not zero, then perform step B3；
B3, ship information interactive system generate a forward link according to the neighbours AIS terminals newly added；
B4, judge whether neighbours' AIS terminals of new AIS terminals occur in forward link；
If so, then terminate analyzing step；
If it is not, step B2 then will be performed after the neighbours AIS terminals write-in routing table of new AIS terminals.
5. network-building method as claimed in claim 1, it is characterised in that the network connection matrix is symmetrical matrix.
6. network-building method as claimed in claim 3, it is characterised in that the AIS cycles are 1 minute.
7. network-building method as claimed in claim 1, it is characterised in that the generation step of the spanning tree includes：
The root AIS terminals of C1, local AIS terminals as spanning tree；
The sub- AIS terminals of the first generation of C2, the neighbours AIS terminals of local AIS terminals as root AIS terminals；
C3, the sub- AIS terminals to each new addition, using the sub- AIS terminals not occurred in the limb of local AIS terminals as
The sub- AIS terminals of future generation of local AIS terminals；
C4, when the AIS terminals for newly adding spanning tree for it is empty when, terminate the generation step of spanning tree.
8. a kind of method of work of ship movement ad hoc networks, it is characterised in that comprise the steps of：
The each AIS periodic broadcastings network connection matrix of S1, AIS terminal；
S2, other AIS terminals are updated network connection matrix after receiving, and generate a generation using local node as root
Tree；
S3, AIS terminal room network connection matrix interactively with each other；
S4, when interaction cycle number is more than or equal to network maximum hop count, each AIS terminals will obtain the topology of whole network even
Relation is connect, completes route establishment process；
S5, when thering are new AIS terminals to add or original AIS terminals are left, pass through network connection matrix interaction notice the whole network, completion net
Network maintenance process.
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| CN106162525A (en) * | 2016-06-28 | 2016-11-23 | 施玥 | Shortwave MANET chain-circuit system |
| CN110247850B (en) * | 2019-06-19 | 2021-07-09 | 中国石油大学(华东) | Ship networking protocol implementation method based on dynamic routing table |
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