JP2004222008A - Communication system between vehicles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system between vehicles capable of efficiently performing communication by using a short address even in the case that the constitution of a network is frequently changed. <P>SOLUTION: In the communication system between the vehicles, the network is constituted when nodes corresponding to respective ones of the plurality of vehicles can communicate with each other. The terminal control part 11 of on-vehicle terminal equipment 10 constituting each node judges whether or not the other node constitutes the network at the time of detecting the other node and performs an address imparting processing required for forming a new network on the basis of the judged result. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inter-vehicle communication system in which in-vehicle terminals communicate with each other.
[0002]
[Prior art]
In an inter-vehicle communication system in which vehicle-mounted terminals communicate with each other, the number of vehicle-mounted terminals constituting a network increases or decreases with the passage of time, or two networks that are separated from each other come closer and merge into one network. It is conceivable that each of the on-board terminals constituting the network may be separated and separated into two or more networks. In general, an address is assigned to identify each in-vehicle terminal. However, if an address having a unique bit length is assigned in advance in consideration of all in-vehicle terminals, the address becomes longer. When used as an address, a frame to be transmitted and received becomes long, which is not preferable. In particular, in an inter-vehicle communication system, communication between in-vehicle terminals is performed by a wireless method such as a mobile phone or a wireless LAN. Therefore, the radio wave condition is often unstable, and the communication time is preferably as short as possible. Therefore, instead of using a fixed address having a long bit length, it is convenient if an address having a short bit length sufficient to identify an on-board terminal constituting the network at that time can be variably set.
[0003]
As a conventional technology that can variably set the address of each terminal constituting a network, a terminal is provided with an address holding unit that variably sets and holds address information, and is activated by starting up a host computer. A communication control system that sets this address information as a physical address of a terminal when the communication is performed is known (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-5-14373 (page 3-4, FIG. 1-8)
[0005]
[Problems to be solved by the invention]
By the way, in the system disclosed in Patent Document 1 described above, the host computer sets the physical address of each terminal at the time of system startup, and copes with the case where the number of terminals configuring the network frequently increases or decreases. There was a problem that can not be. For example, in this system, the physical address of each terminal is set when the system starts up. Therefore, when the number of terminals increases, it is necessary to restart the system each time the system starts up. Further, the above-described conventional system merely discloses an address setting method for a single network centered on a host computer. Therefore, a system in which network fusion or separation frequently occurs, such as an inter-vehicle communication system. Can not respond. Further, in the conventional system described above, it is necessary to set a unique address that can be changed in advance in each terminal, and when an unspecified in-vehicle terminal forms a network such as an inter-vehicle communication system, the unique address is set in advance. It is difficult to set the address, and if it is not possible to set it, it is necessary to increase the address length and prepare an address that is unlikely to be duplicated in advance. As described above, the conventional system has a problem in that even when the network configuration is frequently changed, communication cannot be efficiently performed using short addresses.
[0006]
The present invention has been made in view of such a point, and an object of the present invention is to provide a vehicle-to-vehicle which can efficiently communicate using a short address even when the network configuration is frequently changed. A communication system is provided.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, an inter-vehicle communication system according to the present invention has a network configured when nodes corresponding to a plurality of vehicles are in a mutually communicable state. Is a node detecting unit that detects another node, a network determining unit that determines whether the other node configures a network, and the other node does not configure a network by the network determining unit. Address setting means for performing an address assignment process for forming a new network by the own node and another node when it is determined that When a single node meets each other, a new network is formed, and a new address assignment process is performed at this time. Therefore, a short address can be set for each node. As a result, in subsequent communication between nodes in the network, it is possible to use a frame of a small address area or the like to identify another node from each other and to notify the own node to other nodes. Efficient communication can be achieved by reducing the address area which is not directly related to the data to be transmitted / received. Further, unlike the related art, there is an advantage that a network can be configured without assembling a client-server type system, and a network suitable for an ad hoc environment can be constructed.
[0008]
Further, the above-described address setting means may be configured such that, as a result of arbitration when data is first transmitted and received between the own node and another node, when data transmitted from the own node to another node is prioritized. It is desirable to set an address for subordinate another node to the own node, and to set an address to subordinate the own node to another node when data transmitted from another node toward the own node is prioritized. . Thus, when a new network is formed, the address of each node included in this network can be uniquely determined, and the processing related to address assignment can be simplified.
[0009]
Further, the above-mentioned address setting means performs an address assigning process for making the own node subordinate to the network to which the other node belongs when it is judged by the network judging means that the other node forms a network. It is desirable. Thereby, when the own node is absorbed into the network, it is possible to identify the other node in the network only by setting the address of the own node, thereby simplifying the address setting process. it can.
[0010]
Further, it is preferable that the above-mentioned address setting means sets the address of the own node so as to be serially numbered with the address of each node to which the other node belongs. As a result, the address of each node constituting the network can be a continuous number, so that the bit length of the address can be minimized, and the address area included in frames transmitted and received between nodes can be reduced. Communication can be performed efficiently.
[0011]
In the inter-vehicle communication system of the present invention, a network is configured when nodes corresponding to a plurality of vehicles can communicate with each other, and a node included in one network detects another node. Node detecting means, a network determining means for determining whether or not another node constitutes another network, and when the network determining means determines that another node is included in another network. And address setting means for performing an address assignment process for forming a new network by fusing one network including its own node with another network including another node. When two networks meet each other, a new network is formed by fusing them, and a new address assignment process is performed. Therefore, a short address can be set for each node. As a result, in subsequent communication between nodes in the new network, it is possible to use a frame of a small address area or the like to identify another node from each other and to notify the own node to another node. In addition, it is possible to efficiently communicate by reducing an address area which is not directly related to data to be transmitted / received.
[0012]
Further, the above-mentioned address setting means makes a node included in one network dependent on a node included in another network when the number of nodes included in one network is smaller than the number of nodes included in another network. It is desirable to perform an address assignment process for causing the address to be assigned. By clarifying the superiority between the two networks in this way, the address assignment process can be simplified.
[0013]
Further, it is desirable that the above-mentioned address setting means sets the address of a node included in one network so as to be a serial number with the address of a node included in another network. This makes it possible to make the addresses of the nodes constituting the new network continuous numbers, so that the bit length of the addresses can be minimized, and the address area included in frames transmitted and received between nodes can be reduced. This makes it possible to perform efficient communication.
[0014]
Further, in the inter-vehicle communication system of the present invention, a network is configured when nodes corresponding to a plurality of vehicles can communicate with each other, and the number of nodes included in the network is reduced to the number of nodes configuring the network. The network configuration determining means for determining whether or not there is a change, and when the network configuration determining means determines that the number of nodes constituting the network has changed, the addresses of the nodes included in the network are serialized. And an address assigning means for performing an address assigning process. When the configuration of the network is changed, the address assignment process is performed so that the serial numbers are re-numbered. Therefore, the bit length of the address of each node constituting the network can always be minimized, and transmission and reception between nodes can be performed. It is possible to perform efficient communication by reducing the address area included in a frame or the like.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an inter-vehicle communication system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an overview of an inter-vehicle communication system according to an embodiment. In the inter-vehicle communication system of the present embodiment, as shown in FIG. 1, a first network N1 is configured by a group including nodes A, B, and C. In this network N1, an address “0” is assigned to a node A serving as a root, an address “1” is assigned to a node B, and an address “2” is assigned to a node C. Similarly, a second network N2 is configured by a group including nodes D, E, F, G, and H. In this network N2, the address “0” is assigned to the root node E, the address “1” is assigned to the node D, the address “2” is assigned to the node F, the address “3” is assigned to the node G, and the address is assigned to the node H. “4” is allocated to each. Each node constituting each network included in the inter-vehicle communication system is configured by an in-vehicle terminal device mounted on the vehicle.
[0016]
As described above, in the present embodiment, in each network, addresses are always assigned with serial numbers starting from 0. Also, when such two networks N1 and N2 approach each other, it becomes possible to transmit and receive data between the node C configuring one network N1 and the node F configuring the other network N2. A new network is formed by fusing these two networks N1 and N2. In this case, addresses are assigned to the nodes constituting the network in a sequential number starting from 0. In addition, even when a large network is separated into two or more small networks, or when the configuration of the network is changed such as when one node leaves the network, the network always starts from 0 in the changed network. Addresses are assigned sequentially.
[0017]
FIG. 2 is a diagram illustrating a configuration of the in-vehicle device 100 mounted on each vehicle constituting the inter-vehicle communication system of the present embodiment. As shown in FIG. 2, the in-vehicle device 100 includes an in-vehicle terminal device 10, a GPS device 20, and an application processing device 200.
[0018]
The in-vehicle terminal device 10 transmits and receives various types of information by performing wireless communication with the in-vehicle terminal device 10 mounted on another vehicle. To this end, the in-vehicle terminal device 10 includes a terminal control unit 11, a communication information storage unit 12, a transmission unit 13, a reception unit 14, and an antenna switching unit 15.
[0019]
The terminal control unit 11 performs information transmission / reception control and relay control. For example, assuming that data transmission / reception is performed in the form of a packet, the terminal control unit 11 performs a transmission process by creating a packet whose own vehicle is a transmission source, or receives a packet whose own vehicle is a transmission destination. Sometimes, a receiving process for taking in the packet is performed, or a relay process is performed to transfer the packet to another vehicle when another vehicle receives the packet to be transmitted.
[0020]
The communication information storage unit 12 stores the address of the in-vehicle terminal device 10 of another vehicle that is the transmission source when a packet is transmitted from another vehicle, and the own vehicle forms a network with the other vehicle at present. If this is the case, the configuration information of this network is stored.
[0021]
The transmission unit 13 performs a process of transmitting a transmission signal (packet) output from the terminal control unit 11 to another vehicle from the antenna 17 via the antenna switching unit 15. The receiving unit 14 performs a process of receiving a reception signal (packet) transmitted from another vehicle and reaching the antenna 17 via the antenna switching unit 15. The receiving unit 14 has a function of detecting a reception level of a transmission radio wave of a surrounding vehicle. The antenna switching unit 15 switches the antenna 17 based on a transmission / reception switching signal input from the terminal control unit 11. It is selectively connected to the transmission unit 13 or the reception unit 14.
[0022]
In addition, a GPS device 20 and an application processing device 200 are connected to the above-described in-vehicle terminal device 10. The GPS device 20 includes a GPS antenna and a calculation unit that analyzes satellite radio waves received by the GPS antenna, and outputs the position (longitude and latitude) of the vehicle on which the in-vehicle device 100 is mounted.
[0023]
The application processing device 200 instructs the in-vehicle terminal device 10 to transmit information, or performs predetermined processing upon receiving the received information. For example, the application processing device 200 is configured by a navigation device, an in-vehicle computer, and the like.
[0024]
The above-described terminal control unit 11 corresponds to a node detection unit, a network determination unit, an address setting unit, a network configuration determination unit, and an address assignment unit.
The vehicle-to-vehicle communication system according to the present embodiment has such a configuration. Next, an operation of re-assigning an address at a node in each network when the network configuration is changed will be described.
[0025]
When each node included in the inter-vehicle communication system of the present embodiment is classified, it can be roughly classified into three types. The first is a single node that is not included in any network and is not in a communicable state with other nodes. The second is a node included in any of the networks and serving as a root. The third is a node included in any of the networks and other than the root. Hereinafter, the operation of each of these three types of nodes will be described in different cases.
[0026]
(1) In the case of a single node
FIG. 3 is a flowchart showing an operation procedure of a single node, and mainly shows an operation procedure related to an address change. In this embodiment, the node number of each node is used as an address for identifying each node.
[0027]
The terminal control unit 11 in the in-vehicle terminal device 10 constituting a single node determines whether or not another node has been detected (Step 100). If not, a negative determination is made. Leveraging is repeated. If another node is detected, an affirmative determination is made in the determination of step 100.
[0028]
Next, the terminal control unit 11 determines whether or not the detected other nodes constitute a network (step 101). Whether or not another node forms a network can be determined by making an inquiry to this other node. If another node constitutes the network, an affirmative determination is made in the determination of step 101. In this case, the own node of interest is absorbed by the network including the other detected nodes (step 102), and the terminal control unit 11 determines the node number of each node constituting the absorbed network. The node with the largest value is detected, and a node number obtained by adding 1 to the value is set as the address of the own node.
[0029]
When the detected other node does not form a network (when the other node is also a single node), a negative determination is made in the determination of step 101, and then the terminal control unit 11 One of the other nodes is determined as the root (step 103). When two nodes meet, one node attempts to communicate with the other node, so that frames transmitted to each other compete and a predetermined arbitration (arbitration) is performed. As a result, the node on which the transmission frame has priority has been determined as the root. Next, the terminal control unit 11 sets a node number according to whether or not the own node is a root (Step 104). Specifically, the node number “0” is set when the own node becomes the root, and the node number “1” is set when the own node does not become the root. In this way, a new network is formed by the newly detected other node and the own node.
[0030]
FIG. 4 and FIG. 5 are diagrams showing an outline of the node number setting when a single node encounters another single node. As shown in FIG. 4, when single nodes X and Y meet, as shown in FIG. 5, these two nodes X and Y constitute one network. At this time, the node that wins the arbitration becomes the root (node number “0”), and the node number of the other node is set to “1”.
[0031]
FIGS. 6 and 7 are diagrams showing an outline of the node number setting when a single node encounters another node constituting the network. As shown in FIG. 6, when a single node X and any of the three nodes constituting the network meet, the node X is absorbed into the network as shown in FIG. At this time, since the node number of each node included in the original network is "2", the node number of the node X newly added to the network is "3".
[0032]
(2) In the case of the root node included in the network
FIG. 8 is a flowchart showing an operation procedure of a node as a route included in the network, and mainly shows an operation procedure related to an address change.
The terminal control unit 11 in the in-vehicle terminal device 10 constituting a node as a root determines whether or not another node has been detected (step 200). It is determined whether or not the configuration of the included network has been changed (step 201). For example, the terminal control unit 11 corresponding to the root node periodically inquires of other nodes, and checks whether or not there is a response to determine whether or not the other node has left the network. Monitoring. When another node configuring the network has left and the configuration of the network has been changed, an affirmative determination is made in the determination of step 201.
[0033]
Next, the terminal control unit 11 determines whether the own node has become a single node as a result of the change in the network configuration (Step 202). If the node has not become a single node, a negative determination is made, and then the terminal control unit 11 instructs each node to change the setting information, such as reassigning the node number of another node that has not left the network. (Step 203). When the own node becomes a single node, an affirmative determination is made in the determination of step 202. In this case, the network including the own node disappears (step 204).
[0034]
If another node is detected, an affirmative determination is made in the determination of step 200, and then the terminal control unit 11 determines whether the detected other node forms a network (step 205). If the other node is a single node, a negative determination is made, and the other node is absorbed into the network including the own node (step 210).
[0035]
If another node constitutes the network, an affirmative decision is made in the judgment of step 205, and then the terminal control unit 11 determines the number of nodes constituting the own network (the network including the own node). Is larger than the number of nodes constituting another network (a network including other detected nodes) (step 206), and whether the number is smaller (step 207). If the own network has a larger number of nodes, an affirmative determination is made in the determination of step 206, and each node included in another network is absorbed into the network including the own node (step 210). On the other hand, if the own network has a smaller number of nodes, an affirmative determination is made in the determination of step 207, and the own node is absorbed by the other network (step 209).
[0036]
If the number of nodes included in the own network and the number of nodes included in the other network are the same, a negative determination is made in the determination of step 207. Next, the terminal control unit 11 determines whether to absorb the other network. Is determined (step 208). For example, the node numbers of the nodes first encountered in each network are compared, and if the node number included in the own network word is smaller, the own network absorbs the other network. In this case, an affirmative determination is made in the determination of step 208, and each node of the other network is absorbed in the own network (step 210). In the opposite case, a negative determination is made in step 208, and the own node is absorbed in another network (step 209).
[0037]
(3) For nodes other than the root included in the network
FIG. 9 is a flowchart showing an operation procedure of a node other than the root included in the network, and mainly shows an operation procedure related to a node number change.
The terminal control unit 11 in the in-vehicle terminal device 10 constituting a node other than the route determines whether or not another node has been detected (step 300). Is notified to the root node (step 301).
[0038]
If another node has not been detected, a negative determination is made in the determination of step 300, and then the terminal control unit 11 determines whether or not the configuration of the network including the own node has been changed. (Step 302). For example, the terminal control unit 11 corresponding to a node other than the root node periodically receives an inquiry from the root node, and by examining the contents of the inquiry, the root node and other nodes We are monitoring whether we have left. When another node configuring the network has left and the configuration of the network has been changed, an affirmative determination is made in the determination of step 302.
[0039]
Next, the terminal control unit 11 determines whether the own node has become a single node as a result of the change in the network configuration (Step 303). If the individual node has not become a single node, a negative determination is made, and then the terminal control unit 11 determines whether or not its own network includes a root node (step 304). If it is included, an affirmative determination is made, and the setting information such as the node number is changed as necessary according to the instruction of the root node (step 305).
[0040]
If the route is not included in the own network, a negative determination is made in the determination of step 304, and then the terminal control unit 11 determines a route from the remaining nodes of the own network (step 306). ). For example, the node having the smallest node number among all the nodes remaining in the own network is the root.
[0041]
Next, the terminal control unit 11 determines whether the own node has become the root (Step 307). If not, a negative determination is made, and the setting information such as the node number is changed according to the instruction of the newly rooted node (step 305). If the own node has become the root, an affirmative determination is made in the determination of step 307. Next, the terminal control unit 11 sends setting information such as node numbers to all nodes included in the own network. Change (step 308).
[0042]
If the own node becomes a single node as a result of the change of the network configuration, an affirmative determination is made in the determination of step 303. In this case, the network including the own node disappears (step 309).
FIGS. 10 and 11 are diagrams showing an outline of the node number setting when two networks having different sizes meet each other. As shown in FIG. 10, when a network composed of three nodes meets a network composed of four nodes, a large network having a large number of nodes absorbs a small network having a small number of nodes. In this case, as shown in FIG. 11, the node numbers of the nodes in the new network are not changed for the four nodes constituting the large network, but are changed for the three nodes constituting the small network. With regard to, the order of the node numbers among these does not change, and a new node number is assigned from the node number (node number 4) next to the node numbers of the four nodes that constituted the large network.
[0043]
FIGS. 12, 13 and 14 are diagrams showing an outline of the node number setting when two networks having the same size meet each other. As shown in FIG. 12, when two networks each consisting of three nodes meet, the dependency of these networks is determined by which node of each network first meets. For example, as shown in FIG. 13, when a node serving as a route included in one network first encounters a node with a node number 2 included in the other network, the other network is connected to one network. Absorbed. As a result, as shown in FIG. 14, the node numbers of the nodes in the new network are not changed for the three nodes constituting one network, but are changed for the three nodes constituting the other network. With regard to, a new node number is assigned from the next (node number 3) after the node numbers of the three nodes constituting one network without changing the order of the node numbers among them.
[0044]
FIG. 15 to FIG. 19 are diagrams showing the outline of the node number setting when the network configuration is changed. When there is a network consisting of seven nodes (FIG. 15), when the root node leaves the network (FIG. 16), the network disappears when viewed from the separated node X, and when viewed from the other nodes. The root node disappears from the own network (FIG. 17). In this case, the node numbers of the remaining nodes in the network whose configuration has been changed are such that the order of the node numbers among these nodes does not change, and the node numbers are shifted one by one as a whole. The node to which the node number 1 has been assigned becomes the new root.
[0045]
Also, when the network composed of seven nodes shown in FIG. 15 is separated into a first network composed of three nodes and a second network composed of four nodes (FIG. 18), , The numbers are changed while maintaining the order of the node numbers, and the node having the smallest node number in each network becomes the root (FIG. 19).
[0046]
As described above, in the inter-vehicle communication system of the present embodiment, when a single node meets each other, a new network is formed, and at this time, a new address assignment process is performed, so that a short address is assigned to each node. It becomes possible to set. As a result, in subsequent communication between nodes in the network, it is possible to use a frame of a small address area or the like to identify another node from each other and to notify the own node to other nodes. Efficient communication can be achieved by reducing the address area which is not directly related to the data to be transmitted / received.
[0047]
In addition, as a result of arbitration when data is first transmitted and received between the own node and another node, when data transmitted from the own node to another node is prioritized, an address having the own node as a root. When the data sent from another node to its own node is prioritized, an address with the other node as the root is set, and when a new network is formed, it is included in this network. The address of each node to be assigned can be uniquely determined, and processing related to address assignment can be simplified.
[0048]
Also, when it is determined that the other node with which the own node meets constitutes a network, the own node performs the address assignment processing for making the own node subordinate to the network to which the other node belongs. When it is absorbed into the network, it is possible to identify the node from other nodes in the network only by setting the address of the own node, thereby simplifying the address setting process.
[0049]
In addition, by setting the address of the own node so as to be consecutive with the address of each node to which the other node belongs, the address of each node constituting the network can be made a continuous number. The bit length can be minimized, and efficient communication can be performed by reducing the address area included in frames and the like transmitted and received between nodes.
[0050]
In addition, in the inter-vehicle communication system of the present embodiment, when two networks meet each other, a new network is formed by fusing them, and a new address assignment process is performed. Therefore, a short address is assigned to each node. It becomes possible to set. As a result, in subsequent communication between nodes in the new network, it is possible to use a frame of a small address area or the like to identify another node from each other and to notify the own node to another node. In addition, it is possible to efficiently communicate by reducing an address area which is not directly related to data to be transmitted / received.
[0051]
Further, by performing an address assignment process for making the network with the smaller number of nodes dependent on the network with the larger number of nodes, it is possible to clarify the superiority between the two networks, and to simplify the address assignment process. Becomes possible. Further, by setting the addresses of the nodes included in one network so as to be consecutive with the addresses of the nodes included in the other networks, the addresses of the nodes constituting the new network are set as continuous numbers. Therefore, the bit length of the address can be minimized, and efficient communication can be performed by reducing the address area included in a frame or the like transmitted and received between nodes.
[0052]
Further, the vehicle-to-vehicle communication system according to the present embodiment also has an advantage that a network can be configured without forming a client-server type system as in the related art, and a network suitable for an ad hoc environment can be constructed.
In addition, in the inter-vehicle communication system of the present invention, when the configuration of the network is changed, the address assignment processing is performed so that the serial number is again set. Therefore, the bit length of the address of each node configuring the network is always the most. It is possible to reduce the address area included in a frame or the like transmitted and received between the nodes, thereby enabling efficient communication.
[0053]
Note that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, when a single node meets each other, the root node is determined based on the result of the arbitration. May be determined. Similarly, when two networks with the same number of nodes meet, the node numbers of the first two nodes encountered are compared to determine the network dependency, but other criteria are set to determine which network to use. It may be determined whether or not to be dependent.
[0054]
【The invention's effect】
As described above, according to the present invention, when a single node meets each other, a new network is formed, and a new address assignment process is performed at this time. Therefore, a short address is set for each node. It becomes possible. As a result, in subsequent communication between nodes in the network, it is possible to use a frame of a small address area or the like to identify another node from each other and to notify the own node to other nodes. Efficient communication can be achieved by reducing the address area which is not directly related to the data to be transmitted / received.
[0055]
In addition, when two networks meet each other, a new network is formed by fusing them, and a new address assignment process is performed. Therefore, a short address can be set for each node. As a result, in subsequent communication between nodes in the new network, it is possible to use a frame of a small address area or the like to identify another node from each other and to notify the own node to another node. In addition, it is possible to efficiently communicate by reducing an address area which is not directly related to data to be transmitted / received.
[0056]
Furthermore, when the configuration of the network is changed, the address assignment processing is performed so that the serial numbers are again assigned. Therefore, the bit length of the address of each node configuring the network can always be minimized, and the Thus, efficient communication can be performed by reducing an address area included in a frame or the like to be transmitted and received.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an outline of an inter-vehicle communication system according to an embodiment;
FIG. 2 is a diagram showing a configuration of an in-vehicle device mounted on each vehicle constituting the communication system between vehicles according to the embodiment.
FIG. 3 is a flowchart showing an operation procedure of a single node.
FIG. 4 is a diagram schematically illustrating a node number setting when a single node encounters another single node;
FIG. 5 is a diagram schematically illustrating a node number setting when a single node encounters another single node;
FIG. 6 is a diagram showing an outline of a node number setting when a single node encounters another node constituting a network.
FIG. 7 is a diagram illustrating an outline of a node number setting when a single node encounters another node configuring a network;
FIG. 8 is a flowchart showing an operation procedure of a node as a route included in the network.
FIG. 9 is a flowchart showing an operation procedure of a node other than the root included in the network.
FIG. 10 is a diagram showing an outline of node number setting when two networks having different sizes meet each other.
FIG. 11 is a diagram showing an outline of node number setting when two networks having different sizes meet each other.
FIG. 12 is a diagram schematically illustrating node number setting when two networks having the same size meet;
FIG. 13 is a diagram showing an outline of node number setting when two networks having the same size meet each other.
FIG. 14 is a diagram schematically illustrating node number setting when two networks having the same size meet;
FIG. 15 is a diagram showing an outline of node number setting when a network configuration is changed.
FIG. 16 is a diagram showing an outline of setting a node number when a network configuration is changed.
FIG. 17 is a diagram showing an outline of setting a node number when a network configuration is changed.
FIG. 18 is a diagram illustrating an outline of node number setting when a network configuration is changed.
FIG. 19 is a diagram illustrating an outline of node number setting when a network configuration is changed.
[Explanation of symbols]
10 In-vehicle terminal device
11 Terminal control unit
12 Communication information storage
13 Transmission section
14 Receiver
15 Antenna switching unit
100 In-vehicle device
200 Application processing device

Claims (8)

An inter-vehicle communication system in which a node corresponding to each of a plurality of vehicles is configured to have a network when the nodes can communicate with each other,
A single node not included in the network is
Node detection means for detecting another node;
Network determination means for determining whether the other node constitutes the network,
An address setting unit that performs an address assignment process for forming a new network by the own node and the other node when the network determination unit determines that the other node does not configure the network; ,
An inter-vehicle communication system comprising: In claim 1,
The address setting means is configured such that, as a result of arbitration when data is first transmitted and received between the own node and the other node, when data transmitted from the own node to the other node is prioritized, It is characterized by setting an address that causes another node to subordinate to the node, and setting an address that causes the own node to subordinate to another node when data transmitted from another node toward the own node is prioritized. Communication system between vehicles. In claim 1,
The address setting means, when the network determining means determines that the other node forms the network, an address assigning process for making the own node subordinate to the network to which the other node belongs. Communication system between vehicles. In claim 3,
The inter-vehicle communication system, wherein the address setting means sets an address of the own node so as to be a serial number with an address of each node to which the other node belongs. An inter-vehicle communication system in which a network is configured when nodes corresponding to each of a plurality of vehicles can communicate with each other,
The nodes included in one network are:
Node detection means for detecting another node;
Network determining means for determining whether the other node constitutes another network,
When the network determination unit determines that the other node is included in the other network, the network includes the one network including the own node and the other network including the other node. Address setting means for performing an address assignment process for fusing to form a new network;
An inter-vehicle communication system comprising: In claim 5,
The address setting means, when the number of nodes included in the one network is smaller than the number of nodes included in the other network, includes the node included in the one network included in the other network. An inter-vehicle communication system for performing an address assignment process for subordinate to a node. In claim 6,
The inter-vehicle communication system, wherein the address setting means sets an address of the node included in the one network so as to be a serial number with an address of the node included in the other network. An inter-vehicle communication system in which a network is configured when nodes corresponding to each of a plurality of vehicles can communicate with each other,
The nodes included in the network are:
Network configuration determining means for determining whether the number of nodes configuring the network has changed,
An address assigning unit that performs an address assigning process so that, when the network configuration determining unit determines that the number of nodes configuring the network has changed, the addresses of the nodes included in the network are serial numbers; ,
An inter-vehicle communication system comprising:

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