CN105517091A - Vehicle-mounted network communication method - Google Patents

Abstract

The invention discloses a vehicle-mounted network communication method. The vehicle-mounted network comprises access nodes and a vehicle node, and is accessed to the internet through more than one access router. A lane enclosed by p access nodes in the vehicle-mounted network forms a vehicle domain Mx, wherein access nodes in the vehicle domain Mx are recorded as AP(x-j), and the vehicle domain Mx is represented by an access node set Cx. One access node AP(x-j) belongs to more than one vehicle domain, and is connected with r(x-j) access routers, and the access routers are recorded as AR(x-j-y). Through adoption of the vehicle-mounted network communication method, communication continuity in movement can be ensured, and data package loss rate is lowered, so that the service quality of the vehicle-mounted network is improved. The vehicle-mounted network communication method can be applied to fields like road condition monitoring, vehicle management and so on, and has a broad application prospect.

Description

A kind of communication means of vehicle-mounted net

Technical field

The present invention relates to a kind of communication means, in particular a kind of communication means of vehicle-mounted net.

Background technology

Vehicular ad hoc network is subject to extensive concern due to its practicality, becomes the focus of research.One of main feature of vehicular ad hoc network carries out high-speed mobile for vehicle node along road, therefore, the high quality communication how realizing vehicle node is one of focus of research.

Current existing communication protocol is applied in In-vehicle networking also exists some problems, and main cause is as follows:

1), in existing protocol, mobile node needs to send and receives a large amount of control informations to guarantee to communicate unimpeded in moving process, and reduce the loss of packet, and control information transmission can consume a large amount of energy, this significantly can reduce the life-span of mobile node;

2) the control information overhead data packet of existing protocol is comparatively large, and mobile to deliver delay longer thus improve bursts dropping ratio.

Summary of the invention

Goal of the invention: technical problem to be solved by this invention is for the deficiencies in the prior art, the communication means of a kind of vehicle-mounted net providing packet loss low.

Technical scheme: the communication means that the invention discloses a kind of vehicle-mounted net, described vehicle-mounted net comprises access node and vehicle node, and is linked into the Internet by more than one couple in router; The track that in vehicle-mounted net, p access node is closed is built into a car territory M _x, p>=2, car territory M _xin access node be denoted as AP _x-j, p>=j>=1, car territory M _xby the access node set C such as shown in formula (1) _xrepresent;

An access node AP _x-jbelong to more than one car territory, and simultaneously and r _x-jindividual couple in router is connected, r _x-j>=1, described couple in router is denoted as AR _x-j-y, r _x-j>=y>=1; Access node AP _x-jwith couple in router AR _x-j-yby a network prefix GNP _x-j-yunique identification; Car territory M _xby the network prefix set G such as shown in formula (2) _xdefine;

$C_x=\underset{j=1}{\overset{p}{\∪}}{\mathrm{AP}}_{x-j}$ Formula (1),

$G_x=\underset{j=1}{\overset{p}{\∪}}\underset{y=1}{\overset{r_{x-j}}{\∪}}{\mathrm{GNP}}_{x-j-y}$ Formula (2),

The IPv6 allocated by network prefix of vehicle node and node ID are formed, and the node ID of vehicle node has global uniqueness;

Vehicle-mounted net comprises N number of access node, and node ID is i bit, i<64, and node ID space is [1,2 ⁱ﹣ 1], node ID space is divided into N part, each access node preserves a node ID space, and the node ID space of each access node has global uniqueness thus; The node ID space of the n-th access node is [L (n), U (n)], 1≤n≤N, as shown in formula (3) and formula (4), the node ID A (n) of the n-th access node is as shown in formula (5), and the node ID of access node pre-sets;

$L\left(n\right)=\left\{\begin{array}{cc}2;& n=1\\ \frac{(n-1)\&CenterDot;2^i}{N}+1;& 2\&le;n\&le;N\end{array}\right.$ Formula (3),

$U\left(n\right)=\left\{\begin{array}{cc}\frac{n\&CenterDot;2^i}{N}-1;& 1\&le;n\&le;N-1\\ \frac{n\&CenterDot;2^i}{N}-2;& n=N\end{array}\right.$ Formula (4),

$A\left(n\right)=\left\{\begin{array}{cc}1;& n=1\\ \frac{(n-1)\&CenterDot;2^i}{N};& 2\&le;n\&le;N\end{array}\right.$ Formula (5),

An access node belongs to more than one car territory, and for each affiliated car territory, access node preserves a neighbor table, and each list item of neighbor table comprises three territories: neighbours' access node territory, network prefix territory and geographical coordinate territory; The node ID of neighbours' access node territory record neighbours access node, the network prefix of the couple in router be connected with the neighbours' access node in car territory belonging to this access node is recorded in network prefix territory, and the geographical coordinate of the neighbours' access node in car territory belonging to this access node is recorded in geographical coordinate territory.

Said process proposes a car territory and identified by multiple network prefix, thus reduces communication delay and packet loss.

In the method for the invention, access node AP1 obtains the network prefix of these couple in routers by the routing broadcast message receiving the couple in router be connected with oneself, after the network prefix that access node AP1 obtains the couple in router be connected with oneself and node ID, set up neighbor table by following process:

Step 101: start;

Step 102: access node AP1 broadcasts a neighbor table and sets up message, neighbor table sets up the geographical coordinate that Message Payload is access node AP1, and the network prefix of the couple in router be connected with access node AP1;

Step 103: receive neighbor table and set up the vehicle node of message or access node operates respectively according to following three kinds of situations:

Situation 1: vehicle node receive neighbor table set up message and this vehicle node not in the communication range of any access node, this vehicle node forwards the neighbor table received and sets up message, perform step 103;

Situation 2: vehicle node receive neighbor table set up message and this vehicle node in the communication range of an access node, the destination address that the neighbor table received is set up message by this vehicle node is updated to the address of this access node, then send this neighbor table and set up message, perform step 103;

Situation 3: access node receives neighbor table and sets up message, receive the access node that neighbor table sets up message in neighbor table, create a list item, the access node territory of this list item is the node ID of access node AP1, network prefix territory is the network prefix that neighbor table sets up in message, and coordinate domain is the coordinate figure that neighbor table sets up the access node AP1 in message;

Step 104: terminate;

Set up message by the neighbor table receiving the broadcast of neighbours' access node, access node can set up a neighbor table for each affiliated car territory.

In the method for the invention, be arranged in car territory M1 at vehicle node V1, when access node AP1 belongs to car territory M1, after vehicle node V1 starts, adopt MAC Address as temporary address and to access node AP1 application node ID, comprise the steps:

Step 201: start;

Step 202: vehicle node V1 sends address request to access node AP1;

Step 203: after access node AP1 receives address request, a unappropriated node ID is selected from the node ID space of oneself, and return an address response message to vehicle node V1, address response message load is the node ID and the neighbor table corresponding with car territory M1 of distributing, and the node ID distributing to vehicle node V1 is set to distribution state by access node AP1 simultaneously;

Step 204: after vehicle node V1 receives address response message, is set to the node ID of oneself by the node ID in address response message, preserve the neighbor table of car territory M1 in address response message;

Step 205: terminate;

After vehicle node obtains node ID by said process, by this node ID unique identification in whole life cycle;

Node ID combines with each network prefix in network prefix territory in neighbor table and builds the IPv6 address of the heterogeneous networks prefix with global uniqueness after obtaining the neighbor table of car territory M1 by vehicle node.

In the method for the invention, a k-anycast address is used to define the data of a type, all nodes of the data of a type are provided to form a k-anycast group, by a k-anycast address unique identification, k-anycast address is made up of two parts, the reserved field of k-anycastID and the 128-i bit of i bit, the value of reserved field is that 0, k-anycastID pre-sets; The Chinese meaning of anycast is broadcast for appointing;

The Data Placement of the type defined by k-anycast address is plural part, and each part is by a part ID unique identification; When part ID is 0, show to obtain complete data, when part ID is not 0, show the partial data that acquisition node ID identifies; Vehicle node adopts data address to obtain data, and data address is made up of two parts, comprises the part ID set of k-anycastID and the 128-i bit of i bit; K-anycastID shows the type of data, and part ID set indicates the specific part of the type data.{ when P1, P2}, show to obtain the partial data defined by part IDP1 and P2 in the data of K1 definition if k-anycastID is K1, partIDset is;

The present invention proposes vehicle node adopts k-anycast traffic model to communicate, thus effectively reduces communication delay and packet loss.

In the method for the invention, the car territory M1 at vehicle node V1 place is defined by network prefix set G1, comprises the individual different network prefix of g1, the data that vehicle node V1 is defined by following Procedure Acquisition k-anycast address K1 in network prefix set G1:

Step 301: start;

Step 302: vehicle node V1 is from G ₁network prefix structure g the IPv6 address that middle selection g is different, 1≤g≤g ₁, described IPv6 address is denoted as S _z, 1≤z≤g, the node ID of described IPv6 address is the node ID of vehicle node V1, and vehicle node V1 builds g data address, and described data address is denoted as D _z, the k-anycastID of described data address is the part ID that K1, part ID gather the data for k-anycast address K1 definition;

Step 303: vehicle node V1 sends g data request information, and described data request information is denoted as R _z, data request information R _zdestination address be D _z, source address is S _z;

Step 304: data request information R _zfirst be routed to and address S _zthere is the couple in router AR of identical network prefix _z, couple in router AR _zreceive data request information R _zafter, according to IPv6 routing table, by data request information R _zbe sent to the k-anycast group membership that nearest k-anycast address is K1;

Step 305:k-anycast group membership receives data request information R _zafter, return a data response message E _z, data response message E _zload be data request information R _zdestination address D _zpart ID gather the data division defined, data response message E _zdestination address be address S _z, source address is data address D _z;

Step 306: according to data response message E _zdestination address S _znetwork prefix, data response message E _zbe routed to couple in router AR _z, then according to data response message E _zdestination address S _znode ID, data response message E _zbe routed to vehicle node V1;

Step 307: vehicle node V1 receives the data division that g data response message returns simultaneously;

Step 308: terminate.

By said process, vehicle node can utilize the IPv6 address of multiple heterogeneous networks prefix to obtain different pieces of information by heterogeneous networks path simultaneously, thus effectively reduces data communication delays.

Beneficial effect: the communication means that the invention provides a kind of vehicle-mounted net, described In-vehicle networking is by communication means provided by the present invention, the continuity communicated in moving process can be kept, reduce bursts dropping ratio, thus improve the service quality of vehicle-mounted net, the present invention can be applicable to the fields such as road conditions monitoring, vehicle management, is with a wide range of applications.

Accompanying drawing explanation

To do the present invention below in conjunction with the drawings and specific embodiments and further illustrate, above-mentioned and/or otherwise advantage of the present invention will become apparent.

Fig. 1 is network architecture schematic diagram of the present invention.

Fig. 2 is node IP v6 address structure schematic diagram of the present invention.

Fig. 3 of the present inventionly sets up neighbor table schematic flow sheet.

Fig. 4 is address acquisition schematic flow sheet of the present invention.

Fig. 5 is communication process schematic diagram of the present invention.

Embodiment:

The invention provides a kind of communication means of vehicle-mounted net, described In-vehicle networking is by communication means provided by the present invention, the continuity communicated in moving process can be kept, reduce bursts dropping ratio, thus improve the service quality of vehicle-mounted net, the present invention can be applicable to the fields such as road conditions monitoring, vehicle management, is with a wide range of applications.

Fig. 1 is network architecture schematic diagram of the present invention.Described vehicle-mounted net comprises access node 1 and vehicle node 2, and is linked into the Internet by more than one couple in router 3; The track that in vehicle-mounted net, p access node 1 is closed is built into a car territory M _x, p>=2, car territory M _xin access node 1 be denoted as AP _x-j, p>=j>=1, car territory M _xby the access node set C such as shown in formula (1) _xrepresent; In Fig. 1, p equals 4.

An access node AP _x-jbelong to more than one car territory, and simultaneously and r _x-jindividual couple in router 3 is connected, r _x-j>=1, described couple in router 3 is denoted as AR _x-j-y, r _x-j>=y>=1; Access node AP _x-jwith couple in router AR _x-j-yby a network prefix GNP _x-j-yunique identification; Car territory M _xby the network prefix set G such as shown in formula (2) _xdefine;

$C_x=\underset{j=1}{\overset{p}{\&cup;}}{\mathrm{AP}}_{x-j}$ Formula (1),

$G_x=\underset{j=1}{\overset{p}{\&cup;}}\underset{y=1}{\overset{r_{x-j}}{\&cup;}}{\mathrm{GNP}}_{x-j-y}$ Formula (2).

Said process proposes a car territory and identified by multiple network prefix, thus reduces communication delay and packet loss.

Fig. 2 is node IP v6 address structure schematic diagram of the present invention.The IPv6 allocated by network prefix of vehicle node and node ID are formed, and the node ID of vehicle node has global uniqueness;

Vehicle-mounted net comprises N number of access node, and node ID is i bit, i<64, and node ID space is [1,2 ⁱ﹣ 1], node ID space is divided into N part, each access node preserves a node ID space, and the node ID space of each access node has global uniqueness thus; The node ID space of the n-th access node is [L (n), U (n)], 1≤n≤N, as shown in formula (3) and formula (4), the node ID A (n) of the n-th access node is as shown in formula (5), and the node ID of access node pre-sets;

$L\left(n\right)=\left\{\begin{array}{cc}2;& n=1\\ \frac{(n-1)\&CenterDot;2^i}{N}+1;& 2\&le;n\&le;N\end{array}\right.$ Formula (3),

$U\left(n\right)=\left\{\begin{array}{cc}\frac{n\&CenterDot;2^i}{N}-1;& 1\&le;n\&le;N-1\\ \frac{n\&CenterDot;2^i}{N}-2;& n=N\end{array}\right.$ Formula (4),

$A\left(n\right)=\left\{\begin{array}{cc}1;& n=1\\ \frac{(n-1)\&CenterDot;2^i}{N};& 2\&le;n\&le;N\end{array}\right.$ Formula (5),

An access node belongs to more than one car territory, and for each affiliated car territory, access node preserves a neighbor table, and each list item of neighbor table comprises three territories: neighbours' access node territory, network prefix territory and geographical coordinate territory; The node ID of neighbours' access node territory record neighbours access node, the network prefix of the couple in router be connected with the neighbours' access node in car territory belonging to this access node is recorded in network prefix territory, and the geographical coordinate of the neighbours' access node in car territory belonging to this access node is recorded in geographical coordinate territory.

Said process proposes a car territory and identified by multiple network prefix, thus reduces communication delay and packet loss.

Fig. 3 of the present inventionly sets up neighbor table schematic flow sheet.Access node AP1 obtains the network prefix of these couple in routers by the routing broadcast message receiving the couple in router be connected with oneself, after the network prefix that access node AP1 obtains the couple in router be connected with oneself and node ID, set up neighbor table by following process:

Step 101: start;

Step 102: access node AP1 broadcasts a neighbor table and sets up message, neighbor table sets up the geographical coordinate that Message Payload is access node AP1, and the network prefix of the couple in router be connected with access node AP1;

Step 103: receive neighbor table and set up the vehicle node of message or access node operates respectively according to following three kinds of situations:

Situation 1: vehicle node receive neighbor table set up message and this vehicle node not in the communication range of any access node, this vehicle node forwards the neighbor table received and sets up message, perform step 103;

Situation 2: vehicle node receive neighbor table set up message and this vehicle node in the communication range of an access node, the destination address that the neighbor table received is set up message by this vehicle node is updated to the address of this access node, then send this neighbor table and set up message, perform step 103;

Situation 3: access node receives neighbor table and sets up message, receive the access node that neighbor table sets up message in neighbor table, create a list item, the access node territory of this list item is the node ID of access node AP1, network prefix territory is the network prefix that neighbor table sets up in message, and coordinate domain is the coordinate figure that neighbor table sets up the access node AP1 in message;

Step 104: terminate;

Set up message by the neighbor table receiving the broadcast of neighbours' access node, access node can set up a neighbor table for each affiliated car territory.

Fig. 4 is address acquisition schematic flow sheet of the present invention.Be arranged in car territory M1 at vehicle node V1, when access node AP1 belongs to car territory M1, after vehicle node V1 starts, adopt MAC Address as temporary address and to access node AP1 application node ID, comprise the steps:

Step 201: start;

Step 202: vehicle node V1 sends address request to access node AP1;

Step 203: after access node AP1 receives address request, a unappropriated node ID is selected from the node ID space of oneself, and return an address response message to vehicle node V1, address response message load is the node ID and the neighbor table corresponding with car territory M1 of distributing, and the node ID distributing to vehicle node V1 is set to distribution state by access node AP1 simultaneously;

Step 204: after vehicle node V1 receives address response message, is set to the node ID of oneself by the node ID in address response message, preserve the neighbor table of car territory M1 in address response message;

Step 205: terminate;

After vehicle node obtains node ID by said process, by this node ID unique identification in whole life cycle;

Node ID combines with each network prefix in network prefix territory in neighbor table and builds the IPv6 address of the heterogeneous networks prefix with global uniqueness after obtaining the neighbor table of car territory M1 by vehicle node.

Fig. 5 is communication process schematic diagram of the present invention.A k-anycast address is used to define the data of a type, all nodes of the data of a type are provided to form a k-anycast group, by a k-anycast address unique identification, k-anycast address is made up of two parts, the reserved field of k-anycastID and the 128-i bit of i bit, the value of reserved field is that 0, k-anycastID pre-sets; The Chinese meaning of anycast is broadcast for appointing;

The Data Placement of the type defined by k-anycast address is plural part, and each part is by a part ID unique identification; When part ID is 0, show to obtain complete data, when part ID is not 0, show the partial data that acquisition node ID identifies; Vehicle node adopts data address to obtain data, and data address is made up of two parts, comprises the part ID set of k-anycastID and the 128-i bit of i bit; K-anycastID shows the type of data, and part ID set indicates the specific part of the type data.{ when P1, P2}, show to obtain the partial data defined by part IDP1 and P2 in the data of K1 definition if k-anycastID is K1, partIDset is;

The present invention proposes vehicle node adopts k-anycast traffic model to communicate, thus effectively reduces communication delay and packet loss.

In the method for the invention, the car territory M1 at vehicle node V1 place is defined by network prefix set G1, comprises the individual different network prefix of g1, the data that vehicle node V1 is defined by following Procedure Acquisition k-anycast address K1 in network prefix set G1:

Step 301: start;

Step 302: vehicle node V1 is from G ₁network prefix structure g the IPv6 address that middle selection g is different, 1≤g≤g ₁, described IPv6 address is denoted as S _z, 1≤z≤g, the node ID of described IPv6 address is the node ID of vehicle node V1, and vehicle node V1 builds g data address, and described data address is denoted as D _z, the k-anycastID of described data address is the part ID that K1, part ID gather the data for k-anycast address K1 definition;

Step 303: vehicle node V1 sends g data request information, and described data request information is denoted as R _z, data request information R _zdestination address be D _z, source address is S _z;

Step 304: data request information R _zfirst be routed to and address S _zthere is the couple in router AR of identical network prefix _z, couple in router AR _zreceive data request information R _zafter, according to IPv6 routing table, by data request information R _zbe sent to the k-anycast group membership that nearest k-anycast address is K1;

Step 305:k-anycast group membership receives data request information R _zafter, return a data response message E _z, data response message E _zload be data request information R _zdestination address D _zpart ID gather the data division defined, data response message E _zdestination address be address S _z, source address is data address D _z;

Step 306: according to data response message E _zdestination address S _znetwork prefix, data response message E _zbe routed to couple in router AR _z, then according to data response message E _zdestination address S _znode ID, data response message E _zbe routed to vehicle node V1;

Step 307: vehicle node V1 receives the data division that g data response message returns simultaneously;

Step 308: terminate.

By said process, vehicle node can utilize the IPv6 address of multiple heterogeneous networks prefix to obtain different pieces of information by heterogeneous networks path simultaneously, thus effectively reduces data communication delays.

In sum, the invention provides a kind of communication means of vehicle-mounted net, described In-vehicle networking is by communication means provided by the present invention, the continuity communicated in moving process can be kept, reduce bursts dropping ratio, thus improve the service quality of vehicle-mounted net, the present invention can be applicable to the fields such as road conditions monitoring, vehicle management, is with a wide range of applications.

Embodiment 1

Based on the simulation parameter of table 1, the present embodiment simulates the mobile switch method of the vehicle-mounted net in the present invention, performance evaluation is as follows: when vehicle node obtains the data of 100MB, and when the address that vehicle node has heterogeneous networks prefix increases, its data obtaining time reduces.When the number of addresses that vehicle node has heterogeneous networks prefix is 2, data acquisition average retardation is 200ms, and when the number of addresses that vehicle node has heterogeneous networks prefix is 5, data acquisition average retardation is 100ms.

Table 1 simulation parameter

The invention provides the thinking of vehicle-mounted Network Communication method; the method and access of this technical scheme of specific implementation is a lot; the above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.The all available prior art of each component part not clear and definite in the present embodiment is realized.

Claims (5)

1. a communication means for vehicle-mounted net, is characterized in that, described vehicle-mounted net comprises access node and vehicle node, and is linked into the Internet by more than one couple in router; The track that in vehicle-mounted net, p access node is closed is built into a car territory M _x, p>=2, car territory M _xin access node be denoted as AP _x-j, p>=j>=1, car territory M _xby the access node set C such as shown in formula (1) _xrepresent;

An access node AP _x-jbelong to more than one car territory, and simultaneously and r _x-jindividual couple in router is connected, r _x-j>=1, described couple in router is denoted as AR _x-j-y, r _x-j>=y>=1; Access node AP _x-jwith couple in router AR _x-j-yby a network prefix GNP _x-j-yunique identification; Car territory M _xby the network prefix set G such as shown in formula (2) _xdefine;

$C_x=\underset{j=1}{\overset{p}{\&cup;}}{\mathrm{AP}}_{x-j}$ Formula (1),

$G_x=\underset{j=1}{\overset{p}{\&cup;}}\underset{y=1}{\overset{r_{x-j}}{\&cup;}}{\mathrm{GNP}}_{x-j-y}$ Formula (2),

The IPv6 allocated by network prefix of vehicle node and node ID are formed, and the node ID of vehicle node has global uniqueness;

Vehicle-mounted net comprises N number of access node, and node ID is i bit, i<64, and node ID space is [1,2 ⁱ﹣ 1], node ID space is divided into N part, each access node preserves a node ID space, and the node ID space of each access node has global uniqueness thus; The node ID space of the n-th access node is [L (n), U (n)], 1≤n≤N, as shown in formula (3) and formula (4), the node ID A (n) of the n-th access node is as shown in formula (5), and the node ID of access node pre-sets;

$L\left(n\right)=\left\{\begin{array}{cc}2;& n=1\\ \frac{(n-1)\&CenterDot;2^i}{N}+1;& 2\&le;n\&le;N\end{array}\right.$ Formula (3),

$U\left(n\right)=\left\{\begin{array}{cc}\frac{n\&CenterDot;2^i}{N}-1;& 1\&le;n\&le;N-1\\ \frac{n\&CenterDot;2^i}{N}-2;& n=N\end{array}\right.$ Formula (4),

$A\left(n\right)=\left\{\begin{array}{cc}1;& n=1\\ \frac{(n-1)\&CenterDot;2^i}{N};& 2\&le;n\&le;N\end{array}\right.$ Formula (5),

An access node belongs to more than one car territory, and for each affiliated car territory, access node preserves a neighbor table, and each list item of neighbor table comprises three territories: neighbours' access node territory, network prefix territory and geographical coordinate territory; The node ID of neighbours' access node territory record neighbours access node, the network prefix of the couple in router be connected with the neighbours' access node in car territory belonging to this access node is recorded in network prefix territory, and the geographical coordinate of the neighbours' access node in car territory belonging to this access node is recorded in geographical coordinate territory.

2. the communication means of a kind of vehicle-mounted net according to claim 1, it is characterized in that, access node AP1 obtains the network prefix of these couple in routers by the routing broadcast message receiving the couple in router be connected with oneself, after the network prefix that access node AP1 obtains the couple in router be connected with oneself and node ID, set up neighbor table by following process:

Step 101: start;

Step 102: access node AP1 broadcasts a neighbor table and sets up message, neighbor table sets up the geographical coordinate that Message Payload is access node AP1, and the network prefix of the couple in router be connected with access node AP1;

Step 103: receive neighbor table and set up the vehicle node of message or access node operates respectively according to following three kinds of situations:

Situation 1: vehicle node receive neighbor table set up message and this vehicle node not in the communication range of any access node, this vehicle node forwards the neighbor table received and sets up message, perform step 103;

Situation 2: vehicle node receive neighbor table set up message and this vehicle node in the communication range of an access node, the destination address that the neighbor table received is set up message by this vehicle node is updated to the address of this access node, then send this neighbor table and set up message, perform step 103;

Situation 3: access node receives neighbor table and sets up message, receive the access node that neighbor table sets up message in neighbor table, create a list item, the access node territory of this list item is the node ID of access node AP1, network prefix territory is the network prefix that neighbor table sets up in message, and coordinate domain is the coordinate figure that neighbor table sets up the access node AP1 in message;

Step 104: terminate;

Set up message by the neighbor table receiving the broadcast of neighbours' access node, access node can set up a neighbor table for each affiliated car territory.

3. the communication means of a kind of vehicle-mounted net according to claim 2, it is characterized in that, car territory M1 is arranged at vehicle node V1, when access node AP1 belongs to car territory M1, after vehicle node V1 starts, adopt MAC Address as temporary address and to access node AP1 application node ID, comprise the steps:

Step 201: start;

Step 202: vehicle node V1 sends address request to access node AP1;

Step 203: after access node AP1 receives address request, a unappropriated node ID is selected from the node ID space of oneself, and return an address response message to vehicle node V1, address response message load is the node ID and the neighbor table corresponding with car territory M1 of distributing, and the node ID distributing to vehicle node V1 is set to distribution state by access node AP1 simultaneously;

Step 204: after vehicle node V1 receives address response message, is set to the node ID of oneself by the node ID in address response message, preserve the neighbor table of car territory M1 in address response message;

Step 205: terminate;

After vehicle node obtains node ID by said process, by this node ID unique identification in whole life cycle;

Node ID combines with each network prefix in network prefix territory in neighbor table and builds the IPv6 address of the heterogeneous networks prefix with global uniqueness after obtaining the neighbor table of car territory M1 by vehicle node.

4. the communication means of a kind of vehicle-mounted net according to claim 3, it is characterized in that, a k-anycast address is used to define the data of a type, all nodes of the data of a type are provided to form a k-anycast group, by a k-anycast address unique identification, k-anycast address is made up of two parts, the reserved field of k-anycastID and the 128-i bit of i bit, the value of reserved field is that 0, k-anycastID pre-sets;

The Data Placement of the type defined by k-anycast address is plural part, and each part is by a part ID unique identification; When part ID is 0, show to obtain complete data, when part ID is not 0, show the partial data that acquisition node ID identifies; Vehicle node adopts data address to obtain data, and data address is made up of two parts, comprises the part ID set of k-anycastID and the 128-i bit of i bit; K-anycastID shows the type of data, and part ID set indicates the specific part of the type data.

5. the communication means of a kind of vehicle-mounted net according to claim 4, it is characterized in that, the car territory M1 at vehicle node V1 place is defined by network prefix set G1, the individual different network prefix of g1 is comprised, the data that vehicle node V1 is defined by following Procedure Acquisition k-anycast address K1 in network prefix set G1:

Step 301: start;

Step 302: vehicle node V1 is from G ₁network prefix structure g the IPv6 address that middle selection g is different, 1≤g≤g ₁, described IPv6 address is denoted as S _z, 1≤z≤g, the node ID of described IPv6 address is the node ID of vehicle node V1, and vehicle node V1 builds g data address, and described data address is denoted as D _z, the k-anycastID of described data address is the part ID that K1, part ID gather the data for k-anycast address K1 definition;

Step 303: vehicle node V1 sends g data request information, and described data request information is denoted as R _z, data request information R _zdestination address be D _z, source address is S _z;

Step 304: data request information R _zfirst be routed to and address S _zthere is the couple in router AR of identical network prefix _z, couple in router AR _zreceive data request information R _zafter, according to IPv6 routing table, by data request information R _zbe sent to the k-anycast group membership that nearest k-anycast address is K1;

Step 305:k-anycast group membership receives data request information R _zafter, return a data response message E _z, data response message E _zload be data request information R _zdestination address D _zpart ID gather the data division defined, data response message E _zdestination address be address S _z, source address is data address D _z;

Step 306: according to data response message E _zdestination address S _znetwork prefix, data response message E _zbe routed to couple in router AR _z, then according to data response message E _zdestination address S _znode ID, data response message E _zbe routed to vehicle node V1;

Step 307: vehicle node V1 receives the data division that g data response message returns simultaneously;

Step 308: terminate.