CN107948180B - A New Generation Network Realization Method Based on Multipath - Google Patents

Abstract

The present invention provides a method for implementing a new generation network based on multipath, the network includes infrastructure equipment and mobile nodes; each mobile node has N interfaces, each interface uses a different protocol for communication, and a mobile node can Communication is carried out through N types of protocols, and an infrastructure equipment link has at least 2N interfaces, which can communicate through N types of protocols, and at least two or more interfaces use the same protocol for communication; in the present invention, Nodes obtain data simultaneously through multiple paths, thereby reducing data communication delay and improving data service quality. The invention can be applied to many fields such as traffic road condition inspection and control, agricultural engineering, etc., and has wide application prospects.

Description

A New Generation Network Realization Method Based on Multipath

technical field

The invention relates to an implementation method, in particular to a multipath-based new generation network implementation method.

Background technique

The communication between nodes in the next-generation network is realized through the forwarding and routing of intermediate nodes. Therefore, one of the key technologies to be solved in the realization of the next-generation network is to reduce the data transmission delay so that users can quickly obtain network services. With the development of the new generation network technology, the new generation network will become a mode of providing services in the future network.

At present, the implementation mode of the new generation network is realized through broadcasting, so the delay and cost are relatively large, which reduces the network service performance. Therefore, how to reduce the delay and cost of providing services in the new generation network has become a hot research issue in recent years.

Contents of the invention

Purpose of the invention: The technical problem to be solved by the present invention is to provide a multipath-based new generation network implementation method for the deficiencies of the prior art.

Technical solution: the present invention discloses a method for implementing a new generation network based on multipath, the network includes infrastructure equipment and mobile nodes; each mobile node has N interfaces, and each interface uses a different protocol for communication, for example Wifi, bluetooth, etc., a mobile node can communicate through N types of protocols, and an infrastructure equipment link has at least 2N interfaces, which can communicate through N types of protocols, and at least two or more interfaces use the same Each infrastructure device maintains an interface table, and each interface table item includes a protocol field and an interface collection field. The protocol field value defines the type of protocol, and the interface collection field value stores all interfaces that use this protocol for communication; The interface table of each infrastructure device (can be preset by the manufacturer);

A mobile node is connected to an infrastructure device link and communicates with other mobile nodes through the infrastructure device;

One type of data is uniquely identified by a name, one type of data consists of more than two data blocks, and each data block is uniquely identified by a data block ID;

A message is composed of message format field, name field, data block ID set field, message type field and payload. If the message format field is 0, a message only includes message format field, name field, message type field and payload; if the message If the format field is 1, a message includes message format field, name field, data block ID set field, message type field and payload;

The message types are shown in the table below

message type message type value make an announcement 1 request message 2 response message 3 toggle message 4

Each infrastructure device or mobile node maintains a forwarding table, and the forwarding table item is composed of name field value and interface set field value;

Under the condition that the mobile node R1 has N interfaces, and the interface x supports the protocol p _x and is connected to the interface link of the infrastructure device I1 supporting the protocol p _x , 1≤x≤N, the data C1 is uniquely identified by the name NA1, and the mobile After node R1 generates data C1, it executes the following publishing operations:

Step 101: start;

Step 102: The mobile node R1 constructs a release message, the message format of the release message is 0, the name field value is NA1, the message type is 1, and the payload is empty, and the mobile node R1 sends the release message from each interface;

Step 103: After infrastructure device I1 receives the release message from N interfaces, for each received release message, infrastructure device I1 performs the following operations: Infrastructure device I1 receives the release message from its own interface y message, the infrastructure device I1 checks the forwarding table, if there is a forwarding table entry whose name field value is equal to the name field value of the published message, then add interface y to the interface set field value of the forwarding table entry; if there is no name field value A forwarding table entry equal to the name field value of the published message, the infrastructure device creates a forwarding table entry, the name field value of the forwarding table entry is equal to the name field value of the published message, and the interface set field value is equal to {y}; the infrastructure device I1 Check the interface table, select the interface table entry whose interface set field value includes interface y, and then forward the publish message from every interface except interface y in the interface set field value;

Step 104: If the mobile node receives the publish message, then execute step 106, otherwise execute step 105;

Step 105: After the infrastructure device receives the release message from the N interfaces, for each received release message, the infrastructure device performs the following operations: the infrastructure device receives the release message from its own interface y1, and the basic The facility checks the forwarding table. If there is a forwarding table entry whose name field value is equal to the name field value of the published message, interface y1 is added to the interface collection field value of the forwarding table entry; if there is no name field value equal to the published message’s The forwarding table entry of the name field value, the infrastructure device creates a forwarding table entry, the name field value of the forwarding table entry is equal to the name field value of the published message, and the interface collection field value is equal to {y1}; the infrastructure device checks the interface table, select The interface set domain value includes the interface entry of interface y1, and then forward the publish message from each interface except interface y1 in the interface set domain value, and execute step 104;

Step 106: After the mobile node receives the release message from the N interfaces respectively, for each received release message, the mobile node performs the following operations: the mobile node receives the release message from its own interface y2, and the mobile node checks the forwarded message If there is a forwarding table entry whose name field value is equal to the name field value of the published message, add interface y2 to the interface collection field value of the forwarding entry; if there is no name field value equal to the name field value of the published message Forwarding table entry, the mobile node creates a forwarding table entry, the name field value of the forwarding table entry is equal to the name field value of the published message, and the interface collection field value is equal to {y2};

Step 107: end.

The mobile node creates a forwarding entry through the above publishing process to obtain data.

In the method of the present invention, the infrastructure equipment maintains a convergence table, and a convergence table item is composed of a name domain, an interface domain and a data block ID collection domain;

The mobile node maintains a request table, and a request table item includes a name field, an interface field and a data block ID collection field;

There are N interfaces in the mobile node U1, the interface j supports the protocol p _j and is connected to the interface link of the infrastructure equipment I2 supporting the protocol p _j , 1≤j≤N, the data C1 is uniquely identified by the name NA1, and is represented by M1 Data block structure, the data block ID of each data block is m, and under the condition of 1≤m≤M1, if the mobile node U1 needs to obtain data C1, it will check the forwarding table, select the forwarding table item E1 whose name field value is NA1, and Obtain the number n1 of elements in the interface set field value of the forwarding entry E1; if M1 is greater than n1, the mobile node U1 obtains the data C1 through the following process:

Step 201: start;

Step 202: The mobile node U1 divides the M1 data block IDs into n1 data block ID sets, and sets the parameter z to 1, which indicates the zth element in the interface set field of the forwarding entry E1, 1≤z≤n1 ;

Step 203: judge whether the parameter z is greater than n1, if yes, execute step 205, otherwise execute step 204;

Step 204: For the zth element in the forwarding entry E1 interface collection field, the mobile node U1 performs the following operations, and calculates the data block assigned to the zth element in the forwarding entry E1 interface collection field according to formula (1) ID set F _z , create a request entry, the name field value of the request entry is NA1, the interface field value is the zth element in the interface collection field of the forwarding entry E1, and the data block ID collection field value is F _z , The mobile node U1 builds a request message, the message format of the request message is 1, the name field value is NA1, the data block ID set is F _z , the message type is 2, and the payload is empty; from the interface set field in the forwarding entry E1 The zth element sends the request message, increments the z value by 1, and executes step 203;

Step 205: If the mobile node receives the request message from the interface z1, execute step 210; otherwise execute step 206;

Step 206: After the infrastructure device receives the request message from interface z2, it checks its aggregation table to determine whether there is an interface domain value equal to interface z2, and the name domain value and data block ID set domain value are respectively equal to the name domain value and the data block ID set domain value in the request message. The aggregation entry of the data block ID set domain value, if it exists, execute step 211, otherwise execute step 207;

Step 207: The infrastructure device that receives the request message from interface z2 checks its aggregation table to determine whether there is a name field value equal to the name field value in the request message, and the data block ID set field value is the data block ID set of the request message The aggregation table entry of the superset of , if it exists, execute step 208, otherwise execute step 209;

Step 208: The infrastructure device that receives the request message from interface z2 creates an aggregation table entry, the interface field value of this aggregation table entry is equal to interface z2, and the name field value and data block ID set field value are respectively equal to the name field in the request message Value and data block ID set domain value, execute step 211;

Step 209: The infrastructure device that receives the request message from interface z2 creates an aggregation table entry, the interface field value of this aggregation table entry is equal to interface z2, and the name field value and data block ID set field value are respectively equal to the name field in the request message Value and data block ID collection field value; the infrastructure device checks the interface table, selects the interface entry E2, where interface z2 is an element in the interface collection field of the interface entry E2, and the infrastructure device checks the forwarding table, selects the name field The forwarding entry E3 whose value is equal to the name of the received request message selects the interface z3 that meets the condition 1, forwards the received request message from the interface z3, and executes step 205;

Condition 1: The interface is not only an element in the interface set of the interface entry E2, but also an element in the interface set of the forwarding entry E3;

Step 210: If the mobile node receiving the request message from interface z1 cannot provide data C1, then discard the request message, otherwise, the mobile node creates a response message, the message format of which is 1, the name field value and data The block ID set field value is the name field value and the data block ID set field value of the received request message respectively, the message type is 3, and the load is the data block set defined by each data block ID in the data block ID set; then from Interface z1 sends the response message;

Step 211: If the mobile node U1 receives a response message from the interface z3, then execute step 213, otherwise execute step 212;

Step 212: The infrastructure device receives the response message from its own interface, calls the interface z4, checks the aggregation table, selects all aggregation entries whose name field value is equal to the name field value of the response message, and for each selected For the aggregation entry, the infrastructure equipment performs the following operations: if the intersection S1 of the data block ID set of the aggregation entry and the data block ID set of the received response message is not empty, the infrastructure equipment constructs a response message, the The message format of the response message is 1, the name field value is the name field value of the aggregation entry, and the data block ID set is the intersection S1 of the data block ID set of the aggregation entry and the data block ID set of the received response message, The message type is 3, and the payload is the set of data blocks defined by each data block ID in the intersection S1. The constructed response message is sent from the interface field of the aggregation entry, and the infrastructure device simultaneously receives the data block ID of the aggregation entry Delete the intersection S1 from the set, if the data block ID set of the aggregation entry is empty, delete the aggregation entry, and execute step 211;

Step 213: after the mobile node U1 receives the response message from the interface z3, check the request table and delete the request entry whose name field value is equal to the name field value of the response message and whose data block ID set is equal to the data block ID set of the response message, If there is no request entry whose name domain value is equal to the name domain value of the response message in the request table of the mobile node U1, then perform step 214, otherwise perform step 211;

Step 214: The mobile node U1 constructs all received data blocks into data C1;

Step 215: end;

In step 210, if the mobile node that receives the request message from interface z1 can provide data C1, and the mobile node fails before sending the response message, the mobile node selects an interface x2 that is in a valid working state, and constructs a A response message is sent from the interface x2, and steps 211-215 are executed to complete the data acquisition process.

The mobile node can quickly obtain data through the above process.

In the method of the present invention, there are N interfaces in the mobile node U1, the interface j supports the protocol p _j and is connected to the interface link of the infrastructure equipment I2 supporting the protocol p _j , 1≤j≤N, and the data C2 has the name NA2 It is uniquely identified and consists of M2 data blocks. The data block ID of each data block is q, and under the condition of 1≤q≤M2, if the mobile node U1 needs to obtain data C2, then check the forwarding table and select the name field value as Name the forwarding table entry E5 of NA2 and obtain the number n5 of elements in the interface set field value of the forwarding table entry E5; if M2 is less than or equal to n5, then the mobile node U1 obtains the data C2 through the following process:

Step 301: start;

Step 302: The mobile node U1 sets the parameter b to 1, and the parameter b indicates the data block ID of the bth data block of the data C2;

Step 303: judge whether the parameter b is greater than M2, if yes, execute step 305, otherwise execute step 304;

Step 304: The mobile node U1 checks the request table, selects the interface z5 that meets the condition 2, and creates a request entry. The name field value of the request entry is NA2, the interface field value is z5, and the data block ID set field value is {b }, the mobile node U1 constructs a request message, the message format of the request message is 1, the name domain value is NA2, the data block ID set is {b}, the message type is 2, and the payload is empty, and then sends the request from the interface z5 message; increase the value of b by 1, and execute step 303;

Condition 2: Among all the interfaces of the mobile node U1, the number of request entries of the interface set domain value including the interface z5 is the smallest;

Step 305: If the mobile node receives the request message from its own interface, the interface is called interface z6, then perform step 310; otherwise, perform step 306;

Step 306: After the infrastructure device receives the request message from its own interface, it calls the interface z7, checks its aggregation table to determine whether there is an interface domain value equal to interface z7, the name domain value and the data block ID set domain value respectively Equal to the aggregation entry of the name domain value and the data block ID collection domain value in the request message, if exist, then execute step 311, otherwise execute step 307;

Step 307: The infrastructure device that receives the request message from interface z7 checks its aggregation table to determine whether there is a name field value equal to the name field value in the request message, and the data block ID set field value is the data block ID set of the request message The aggregation entry of the superset of , if it exists, execute step 308, otherwise execute step 309;

Step 308: The infrastructure device that receives the request message from interface z7 creates an aggregation table entry, the interface field value of the aggregation table entry is equal to interface z7, and the name field value and data block ID set field value are respectively equal to the name field in the request message Value and data block ID set domain value, execute step 311;

Step 309: The infrastructure device that receives the request message from interface z7 creates an aggregation table entry, the interface field value of this aggregation table entry is equal to interface z7, and the name field value and data block ID set field value are respectively equal to the name field in the request message value and data block ID set field value, then the infrastructure device checks the interface table, selects interface entry E6, where interface z6 is an element in the interface collection field of interface entry E6, then checks the forwarding table, selects the name field value Equal to the forwarding entry E7 of the name of the received request message, then select the interface z8 that meets the condition 3, forward the received request message from the interface z8, and execute step 305;

Condition 3: The interface is not only an element in the interface set of the interface entry E6, but also an element in the interface set of the forwarding entry E7;

Step 310: If the mobile node receiving the request message from interface z6 cannot provide the data C2, then discard the request message; otherwise, the mobile node creates a response message, the message format of which is 1, name field value and data The block ID set field value is the name field value and the data block ID set field value of the received request message respectively, the message type is 3, and the load is the data block set defined by each data block ID in the data block ID set; then from Interface z6 sends the response message;

Step 311: If the mobile node U1 receives a response message from its own interface, the interface is called interface z8, then execute step 313, otherwise execute step 312;

Step 312: The infrastructure device receives the response message from its own interface, calls the interface z9, then checks the aggregation table, selects all aggregation entries whose name field value is equal to the name field value of the response message, and for each selected The infrastructure equipment performs the following operations: if the intersection S2 of the data block ID set of the aggregation table item and the data block ID set of the received response message is not empty, the infrastructure equipment constructs a response message, The message format of the response message is 1, the name field value is the name field value of the aggregation entry, and the data block ID set is the intersection S2 of the data block ID set of the aggregation entry and the data block ID set of the received response message , the message type is 3, and the payload is the set of data blocks defined by each data block ID in the intersection S2, and then the constructed response message is sent from the interface field of the aggregation entry, and the infrastructure device simultaneously receives the data from the aggregation entry Delete the intersection S2 in the block ID set, if the data block ID set of the aggregation entry is empty, delete the aggregation entry, and execute step 311;

Step 313: The mobile node U1 that receives the response message from the interface z8 checks the request table and deletes the request entry whose name domain value is equal to the name domain value of the response message and whose data block ID set is equal to the data block ID set of the response message, if In the request table of the mobile node U1, there is no request entry whose name domain value is equal to the name domain value of the response message, then step 314 is performed, otherwise step 311 is performed;

Step 314: The mobile node U1 constructs all received data blocks into data C2;

Step 315: end;

In step 310, if the mobile node that receives the request message from interface z6 can provide data C2, and the mobile node fails before sending the response message, the mobile node selects an interface x3 that is in a valid working state and constructs a A response message is sent from the interface x3, and steps 311-315 are executed to complete the data acquisition process.

The mobile node can quickly obtain data through the above process.

In the method of the present invention, when the mobile node U1 has N interfaces, the interface f supports the protocol p _f and is connected to the interface link of the infrastructure device I2 supporting the protocol p _f , and under the condition of 1≤f≤N, if the mobile Node U1 detects that interface f1 fails, and 1≤f1≤N, then performs the following switching process:

Step 401: start;

Step 402: The mobile node U1 checks the request table, selects all request entries whose interface field value is equal to interface f1, and for each request entry, the mobile node U1 performs the following operations: the mobile node U1 selects the interface f2 that meets the condition 3, and sets The interface domain value of the request entry is updated to interface f2, and a switching message is constructed. The message format of the switching message is 0, the name is empty, the message type is 4, and the payload is the request entry, and then the request is sent from interface f2 information;

Condition 3: Among all the interfaces of the mobile node U1, the number of request entries of the interface set domain value including the interface f2 is the smallest;

Step 403: After the infrastructure device I2 receives the switching message from the interface f3, it checks the aggregation table, and selects the name field value and the data block ID collection field value equal to the name field value and data block of the request entry in the load of the received switching message The aggregation entry of the ID set, and then update the interface domain value of the aggregation entry to interface f3;

Step 404: end.

The above switching process can ensure that the nodes obtain data correctly and quickly.

Beneficial effects: the present invention provides a new generation network implementation method based on multipath. In the present invention, nodes obtain data simultaneously through multiple paths, thereby reducing data communication delay and improving data service quality. The invention can be applied to many fields such as traffic road condition inspection and control, agricultural engineering, etc., and has wide application prospects.

Description of drawings

The advantages of the above and/or other aspects of the present invention will become clearer as the present invention will be further described in detail in conjunction with the accompanying drawings and specific embodiments.

FIG. 1 is a schematic diagram of the publishing process described in the present invention.

FIG. 2 is a schematic diagram of the data acquisition process described in the present invention.

FIG. 3 is a schematic diagram of the data communication process described in the present invention.

FIG. 4 is a schematic diagram of a handover process according to the present invention.

Detailed ways:

The present invention provides a new generation network realization method based on multipath. In the present invention, nodes simultaneously obtain data through multiple paths, thereby reducing data communication delay and improving data service quality. The invention can be applied to many fields such as traffic road condition inspection and control, agricultural engineering, etc., and has wide application prospects.

FIG. 1 is a schematic diagram of the publishing process described in the present invention. The network includes infrastructure equipment and mobile nodes; each mobile node has N interfaces, and each interface uses different protocols for communication, such as wifi, bluetooth, etc. A mobile node can communicate through N types of protocols, and a basic The facility equipment link has at least 2N interfaces, which can communicate through N types of protocols, and at least two or more interfaces use the same protocol for communication; each infrastructure equipment maintains an interface table, and each interface table item Including the protocol field and the interface collection field, the protocol field value defines the type of protocol, and the interface collection field value stores all the interfaces that use this protocol for communication; the interface table of each infrastructure device can be preset by the manufacturer;

A mobile node is connected to an infrastructure device link and communicates with other mobile nodes through the infrastructure device;

One type of data is uniquely identified by a name, one type of data consists of more than two data blocks, and each data block is uniquely identified by a data block ID;

A message is composed of message format field, name field, data block ID set field, message type field and payload. If the message format field is 0, a message only includes message format field, name field, message type field and payload; if the message If the format field is 1, a message includes message format field, name field, data block ID set field, message type field and payload;

The message types are shown in the table below:

message type message type value make an announcement 1 request message 2 response message 3 toggle message 4

Each infrastructure device or mobile node maintains a forwarding table, and the forwarding table item is composed of name field value and interface set field value;

Under the condition that the mobile node R1 has N interfaces, and the interface x supports the protocol p _x and is connected to the interface link of the infrastructure device I1 supporting the protocol p _x , 1≤x≤N, the data C1 is uniquely identified by the name NA1, and the mobile After node R1 generates data C1, it executes the following publishing operations:

Step 101: start;

Step 102: The mobile node R1 constructs a release message, the message format of the release message is 0, the name field value is NA1, the message type is 1, and the payload is empty, and the mobile node R1 sends the release message from each interface;

Step 103: After infrastructure device I1 receives the release message from N interfaces, for each received release message, infrastructure device I1 performs the following operations: Infrastructure device I1 receives the release message from its own interface y message, the infrastructure device I1 checks the forwarding table, if there is a forwarding table entry whose name field value is equal to the name field value of the published message, then add interface y to the interface set field value of the forwarding table entry; if there is no name field value A forwarding table entry equal to the name field value of the published message, the infrastructure device creates a forwarding table entry, the name field value of the forwarding table entry is equal to the name field value of the published message, and the interface set field value is equal to {y}; the infrastructure device I1 Check the interface table, select the interface table entry whose interface set field value includes interface y, and then forward the publish message from every interface except interface y in the interface set field value;

Step 104: If the mobile node receives the publish message, then execute step 106, otherwise execute step 105;

Step 105: After the infrastructure device receives the release message from the N interfaces, for each received release message, the infrastructure device performs the following operations: the infrastructure device receives the release message from its own interface y1, and the basic The facility checks the forwarding table. If there is a forwarding table entry whose name field value is equal to the name field value of the published message, interface y1 is added to the interface collection field value of the forwarding table entry; if there is no name field value equal to the published message’s The forwarding table entry of the name field value, the infrastructure device creates a forwarding table entry, the name field value of the forwarding table entry is equal to the name field value of the published message, and the interface collection field value is equal to {y1}; the infrastructure device checks the interface table, select The interface set domain value includes the interface entry of interface y1, and then forward the publish message from each interface except interface y1 in the interface set domain value, and execute step 104;

Step 106: After the mobile node receives the release message from the N interfaces respectively, for each received release message, the mobile node performs the following operations: the mobile node receives the release message from its own interface y2, and the mobile node checks the forwarded message If there is a forwarding table entry whose name field value is equal to the name field value of the published message, add interface y2 to the interface collection field value of the forwarding entry; if there is no name field value equal to the name field value of the published message Forwarding table entry, the mobile node creates a forwarding table entry, the name field value of the forwarding table entry is equal to the name field value of the published message, and the interface collection field value is equal to {y2};

Step 107: end.

FIG. 2 is a schematic diagram of the data acquisition process described in the present invention. The infrastructure equipment maintains a collection table, and a collection table item is composed of a name field, an interface field and a data block ID collection field;

The mobile node maintains a request table, and a request table item includes a name field, an interface field and a data block ID collection field;

There are N interfaces in the mobile node U1, the interface j supports the protocol p _j and is connected to the interface link of the infrastructure equipment I2 supporting the protocol p _j , 1≤j≤N, the data C1 is uniquely identified by the name NA1, and is represented by M1 Data block structure, the data block ID of each data block is m, and under the condition of 1≤m≤M1, if the mobile node U1 needs to obtain data C1, it will check the forwarding table, select the forwarding table item E1 whose name field value is NA1, and Obtain the number n1 of elements in the interface set field value of the forwarding entry E1; if M1 is greater than n1, the mobile node U1 obtains the data C1 through the following process:

Step 201: start;

Step 202: The mobile node U1 divides the M1 data block IDs into n1 data block ID sets, and sets the parameter z to 1, which indicates the zth element in the interface set field of the forwarding entry E1, 1≤z≤n1 ;

Step 203: judge whether the parameter z is greater than n1, if yes, execute step 205, otherwise execute step 204;

Step 204: For the zth element in the forwarding entry E1 interface collection field, the mobile node U1 performs the following operations, and calculates the data block assigned to the zth element in the forwarding entry E1 interface collection field according to formula (1) ID set F _z , create a request entry, the name field value of the request entry is NA1, the interface field value is the zth element in the interface collection field of the forwarding entry E1, and the data block ID collection field value is F _z , The mobile node U1 builds a request message, the message format of the request message is 1, the name field value is NA1, the data block ID set is F _z , the message type is 2, and the payload is empty; from the interface set field in the forwarding entry E1 The zth element sends the request message, increments the z value by 1, and executes step 203;

Step 205: If the mobile node receives the request message from the interface z1, execute step 210; otherwise execute step 206;

Step 206: After the infrastructure device receives the request message from interface z2, it checks its aggregation table to determine whether there is an interface domain value equal to interface z2, and the name domain value and data block ID set domain value are respectively equal to the name domain value and the data block ID set domain value in the request message. The aggregation entry of the data block ID set domain value, if it exists, execute step 211, otherwise execute step 207;

Step 207: The infrastructure device that receives the request message from interface z2 checks its aggregation table to determine whether there is a name field value equal to the name field value in the request message, and the data block ID set field value is the data block ID set of the request message The aggregation table entry of the superset of , if it exists, execute step 208, otherwise execute step 209;

Step 208: The infrastructure device that receives the request message from interface z2 creates an aggregation table entry, the interface field value of this aggregation table entry is equal to interface z2, and the name field value and data block ID set field value are respectively equal to the name field in the request message Value and data block ID set domain value, execute step 211;

Step 209: The infrastructure device that receives the request message from interface z2 creates an aggregation table entry, the interface field value of this aggregation table entry is equal to interface z2, and the name field value and data block ID set field value are respectively equal to the name field in the request message Value and data block ID collection field value; the infrastructure device checks the interface table, selects the interface entry E2, where interface z2 is an element in the interface collection field of the interface entry E2, and the infrastructure device checks the forwarding table, selects the name field The forwarding entry E3 whose value is equal to the name of the received request message selects the interface z3 that meets the condition 1, forwards the received request message from the interface z3, and executes step 205;

Condition 1: The interface is not only an element in the interface set of the interface entry E2, but also an element in the interface set of the forwarding entry E3;

Step 210: If the mobile node receiving the request message from interface z1 cannot provide data C1, then discard the request message, otherwise, the mobile node creates a response message, the message format of which is 1, the name field value and data The block ID set field value is the name field value and the data block ID set field value of the received request message respectively, the message type is 3, and the load is the data block set defined by each data block ID in the data block ID set; then from Interface z1 sends the response message;

Step 211: If the mobile node U1 receives a response message from the interface z3, then execute step 213, otherwise execute step 212;

Step 212: The infrastructure device receives the response message from its own interface, calls the interface z4, checks the aggregation table, selects all aggregation entries whose name field value is equal to the name field value of the response message, and for each selected For the aggregation entry, the infrastructure equipment performs the following operations: if the intersection S1 of the data block ID set of the aggregation entry and the data block ID set of the received response message is not empty, the infrastructure equipment constructs a response message, the The message format of the response message is 1, the name field value is the name field value of the aggregation entry, and the data block ID set is the intersection S1 of the data block ID set of the aggregation entry and the data block ID set of the received response message, The message type is 3, and the payload is the set of data blocks defined by each data block ID in the intersection S1. The constructed response message is sent from the interface field of the aggregation entry, and the infrastructure device simultaneously receives the data block ID of the aggregation entry Delete the intersection S1 from the set, if the data block ID set of the aggregation entry is empty, delete the aggregation entry, and execute step 211;

Step 213: after the mobile node U1 receives the response message from the interface z3, check the request table and delete the request entry whose name field value is equal to the name field value of the response message and whose data block ID set is equal to the data block ID set of the response message, If there is no request entry whose name domain value is equal to the name domain value of the response message in the request table of the mobile node U1, then perform step 214, otherwise perform step 211;

Step 214: The mobile node U1 constructs all received data blocks into data C1;

Step 215: end;

In step 210, if the mobile node that receives the request message from interface z1 can provide data C1, and the mobile node fails before sending the response message, the mobile node selects an interface x2 that is in a valid working state, and constructs a A response message is sent from the interface x2, and steps 211-215 are executed to complete the data acquisition process.

FIG. 3 is a schematic diagram of the data communication process described in the present invention. There are N interfaces in the mobile node U1, the interface j supports the protocol p _j and is connected to the interface link of the infrastructure equipment I2 supporting the protocol p _j , 1≤j≤N, the data C2 is uniquely identified by the name NA2, and is represented by M2 Composition of data blocks, the data block ID of each data block is q, and under the condition of 1≤q≤M2, if the mobile node U1 needs to obtain data C2, it will check the forwarding table and select the forwarding table item E5 whose name field value is the name NA2 And obtain the number n5 of elements in the interface set domain value of the forwarding entry E5; if M2 is less than or equal to n5, then the mobile node U1 obtains the data C2 through the following process:

Step 301: start;

Step 302: The mobile node U1 sets the parameter b to 1, and the parameter b indicates the data block ID of the bth data block of the data C2;

Step 303: judge whether the parameter b is greater than M2, if yes, execute step 305, otherwise execute step 304;

Step 304: The mobile node U1 checks the request table, selects the interface z5 that meets the condition 2, and creates a request entry. The name field value of the request entry is NA2, the interface field value is z5, and the data block ID set field value is {b }, the mobile node U1 constructs a request message, the message format of the request message is 1, the name domain value is NA2, the data block ID set is {b}, the message type is 2, and the payload is empty, and then sends the request from the interface z5 message; increase the value of b by 1, and execute step 303;

Condition 2: Among all the interfaces of the mobile node U1, the number of request entries of the interface set domain value including the interface z5 is the smallest;

Step 305: If the mobile node receives the request message from its own interface, the interface is called interface z6, then perform step 310; otherwise, perform step 306;

Step 306: After the infrastructure device receives the request message from its own interface, it calls the interface z7, checks its aggregation table to determine whether there is an interface domain value equal to interface z7, the name domain value and the data block ID set domain value respectively Equal to the aggregation entry of the name domain value and the data block ID collection domain value in the request message, if exist, then execute step 311, otherwise execute step 307;

Step 307: The infrastructure device that receives the request message from interface z7 checks its aggregation table to determine whether there is a name field value equal to the name field value in the request message, and the data block ID set field value is the data block ID set of the request message The aggregation entry of the superset of , if it exists, execute step 308, otherwise execute step 309;

Step 308: The infrastructure device that receives the request message from interface z7 creates an aggregation table entry, the interface field value of the aggregation table entry is equal to interface z7, and the name field value and data block ID set field value are respectively equal to the name field in the request message Value and data block ID set domain value, execute step 311;

Step 309: The infrastructure device that receives the request message from interface z7 creates an aggregation table entry, the interface field value of this aggregation table entry is equal to interface z7, and the name field value and data block ID set field value are respectively equal to the name field in the request message value and data block ID set field value, then the infrastructure device checks the interface table, selects interface entry E6, where interface z6 is an element in the interface collection field of interface entry E6, then checks the forwarding table, selects the name field value Equal to the forwarding entry E7 of the name of the received request message, then select the interface z8 that meets the condition 3, forward the received request message from the interface z8, and execute step 305;

Condition 3: The interface is not only an element in the interface set of the interface entry E6, but also an element in the interface set of the forwarding entry E7;

Step 310: If the mobile node receiving the request message from interface z6 cannot provide the data C2, then discard the request message; otherwise, the mobile node creates a response message, the message format of which is 1, name field value and data The block ID set field value is the name field value and the data block ID set field value of the received request message respectively, the message type is 3, and the load is the data block set defined by each data block ID in the data block ID set; then from Interface z6 sends the response message;

Step 311: If the mobile node U1 receives a response message from its own interface, the interface is called interface z8, then execute step 313, otherwise execute step 312;

Step 312: The infrastructure device receives the response message from its own interface, calls the interface z9, then checks the aggregation table, selects all aggregation entries whose name field value is equal to the name field value of the response message, and for each selected The infrastructure equipment performs the following operations: if the intersection S2 of the data block ID set of the aggregation table item and the data block ID set of the received response message is not empty, the infrastructure equipment constructs a response message, The message format of the response message is 1, the name field value is the name field value of the aggregation entry, and the data block ID set is the intersection S2 of the data block ID set of the aggregation entry and the data block ID set of the received response message , the message type is 3, and the payload is the set of data blocks defined by each data block ID in the intersection S2, and then the constructed response message is sent from the interface field of the aggregation entry, and the infrastructure device simultaneously receives the data from the aggregation entry Delete the intersection S2 in the block ID set, if the data block ID set of the aggregation entry is empty, delete the aggregation entry, and execute step 311;

Step 313: The mobile node U1 that receives the response message from the interface z8 checks the request table and deletes the request entry whose name domain value is equal to the name domain value of the response message and whose data block ID set is equal to the data block ID set of the response message, if In the request table of the mobile node U1, there is no request entry whose name domain value is equal to the name domain value of the response message, then step 314 is performed, otherwise step 311 is performed;

Step 314: The mobile node U1 constructs all received data blocks into data C2;

Step 315: end;

In step 310, if the mobile node that receives the request message from interface z6 can provide data C2, and the mobile node fails before sending the response message, the mobile node selects an interface x3 that is in a valid working state and constructs a A response message is sent from the interface x3, and steps 311-315 are executed to complete the data acquisition process.

FIG. 4 is a schematic diagram of a handover process according to the present invention. Under the condition that the mobile node U1 has N interfaces, the interface f supports the protocol p _f and is connected to the interface link of the infrastructure device I2 that supports the protocol p _f , and 1≤f≤N, if the mobile node U1 detects that the interface f1 fails , 1≤f1≤N, then perform the following switching process:

Step 401: start;

Step 402: The mobile node U1 checks the request table, selects all request entries whose interface field value is equal to interface f1, and for each request entry, the mobile node U1 performs the following operations: the mobile node U1 selects the interface f2 that meets the condition 3, and sets The interface domain value of the request entry is updated to interface f2, and a switching message is constructed. The message format of the switching message is 0, the name is empty, the message type is 4, and the payload is the request entry, and then the request is sent from interface f2 information;

Condition 3: Among all the interfaces of the mobile node U1, the number of request entries of the interface set domain value including the interface f2 is the smallest;

Step 403: After the infrastructure device I2 receives the switching message from the interface f3, it checks the aggregation table, and selects the name field value and the data block ID collection field value equal to the name field value and data block of the request entry in the load of the received switching message The aggregation entry of the ID set, and then update the interface domain value of the aggregation entry to interface f3;

Step 404: end.

Example 1

Based on the simulation parameters in Table 1, this embodiment simulates a new-generation network implementation method based on multipath in the present invention, and the performance analysis is as follows: when the number of interfaces increases, the delay for the mobile node to obtain data decreases, and when the number of interfaces decreases When , the delay for the mobile node to obtain data increases. The average delay for mobile nodes to obtain data is 600ms.

Table 1 Simulation parameters

The present invention provides an idea of a new-generation network implementation method based on multipath. There are many methods and approaches to realize this technical solution. The above descriptions are only preferred implementation modes of the present invention. For those skilled in the art, on the premise of not departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components that are not specified in this embodiment can be realized by existing technologies.

Claims (4)

1. A method for implementing a new generation network based on multipath, characterized in that, the network includes infrastructure equipment and mobile nodes; each mobile node has N interfaces, and each interface uses different protocols for communication. Nodes can communicate through N types of protocols. An infrastructure equipment link has at least 2N interfaces that can communicate through N types of protocols, and at least two interfaces use the same protocol for communication; each infrastructure equipment maintains a Interface table, each interface entry includes a protocol field and an interface collection field, the protocol field value defines the type of protocol, and the interface collection field value stores all interfaces that use this protocol for communication; the interface table of each infrastructure device is preset; A mobile node is connected to an infrastructure device link and communicates with other mobile nodes through the infrastructure device; One type of data is uniquely identified by a name, one type of data consists of more than two data blocks, and each data block is uniquely identified by a data block ID; A message is composed of message format field, name field, data block ID set field, message type field and payload. If the message format field is 0, a message only includes message format field, name field, message type field and payload; if the message If the format field is 1, a message includes message format field, name field, data block ID set field, message type field and payload; The message types include: publish message, request message, response message and switching message, and the message type values of publishing message, request message, response message and switching message are 1, 2, 3 and 4 respectively; Each infrastructure device or mobile node maintains a forwarding table, and the forwarding table item is composed of name field value and interface set field value; Under the condition that the mobile node U1 has N interfaces, the interface x supports the protocol p _x and is connected to the interface link of the infrastructure equipment I1 supporting the protocol p _x , 1≤x≤N, the data C1 is uniquely identified by the name NA1, and the mobile After node U1 generates data C1, it executes the following publishing operations: Step 101: start; Step 102: The mobile node U1 constructs a release message, the message format of the release message is 0, the name field value is NA1, the message type is 1, and the payload is empty, and the mobile node U1 sends the release message from each interface; Step 103: After infrastructure device I1 receives the release message from N interfaces, for each received release message, infrastructure device I1 performs the following operations: Infrastructure device I1 receives the release message from its own interface y message, the infrastructure device I1 checks the forwarding table, if there is a forwarding table entry whose name field value is equal to the name field value of the published message, then add interface y to the interface set field value of the forwarding table entry; if there is no name field value A forwarding table entry equal to the name field value of the published message, infrastructure device I1 creates a forwarding table entry, the name field value of the forwarding table entry is equal to the name field value of the published message, and the interface set field value is equal to {y}; I1 checks the interface table, selects the interface table entry whose interface set field value includes interface y, and then forwards the release message from each interface except interface y in the interface set field value; Step 104: If the mobile node connected to the infrastructure equipment link forwarding the release message receives the release message, then execute step 106, otherwise execute step 105; Step 105: After the infrastructure equipment connected to the link of the infrastructure equipment forwarding the release message receives the release message from the N interfaces, for each received release message, the infrastructure equipment performs the following operations: The device receives the release message from its own interface y1, and the infrastructure device checks the forwarding table. If there is a forwarding table entry whose name field value is equal to the name field value of the published message, the interface y1 is added to the interface collection field of the forwarding table entry value; if there is no forwarding table entry whose name field value is equal to the name field value of the published message, the infrastructure device creates a forwarding table entry, the name field value of the forwarding table entry is equal to the name field value of the published message, and the interface collection field value Equal to {y1}; the infrastructure device checks the interface table, selects the interface entry whose interface set domain value includes interface y1, and then forwards the publish message from every interface except interface y1 in the interface set domain value, and executes step 104; Step 106: After the mobile node receives the release message from the N interfaces respectively, for each received release message, the mobile node performs the following operations: the mobile node receives the release message from its own interface y2, and the mobile node checks the forwarded message If there is a forwarding table entry whose name field value is equal to the name field value of the published message, add interface y2 to the interface collection field value of the forwarding entry; if there is no name field value equal to the name field value of the published message Forwarding table entry, the mobile node creates a forwarding table entry, the name field value of the forwarding table entry is equal to the name field value of the published message, and the interface collection field value is equal to {y2}; Step 107: end. 2. A kind of new generation network realization method based on multi-path according to claim 1, it is characterized in that, infrastructure equipment maintains a convergence table, and a convergence table item is made up of name domain, interface domain and data block ID collection domain ; The mobile node maintains a request table, and a request table item includes a name field, an interface field and a data block ID collection field; There are N interfaces in the mobile node U1, the interface j supports the protocol p _j and is connected to the interface link of the infrastructure equipment I2 supporting the protocol p _j , 1≤j≤N, the data C1 is uniquely identified by the name NA1, and M1 Data block structure, the data block ID of each data block is m, and under the condition of 1≤m≤M1, if the mobile node U1 needs to obtain data C1, it will check the forwarding table, select the forwarding table item E1 whose name field value is NA1, and Obtain the number n1 of elements in the interface set field value of the forwarding entry E1; if M1 is greater than n1, the mobile node U1 obtains the data C1 through the following process: Step 201: start; Step 202: The mobile node U1 divides the M1 data block IDs into n1 data block ID sets, and sets the parameter z to 1, which indicates the zth element in the interface set field of the forwarding entry E1, 1≤z≤n1 ; Step 203: judge whether the parameter z is greater than n1, if yes, execute step 205, otherwise execute step 204; Step 204: For the zth element in the forwarding entry E1 interface collection field, the mobile node U1 performs the following operations, and calculates the data block assigned to the zth element in the forwarding entry E1 interface collection field according to formula (1) ID set F _z , create a request entry, the name field value of the request entry is NA1, the interface field value is the zth element in the interface collection field of the forwarding entry E1, and the data block ID collection field value is F _z , The mobile node U1 builds a request message, the message format of the request message is 1, the name field value is NA1, the data block ID set is F _z , the message type is 2, and the payload is empty; from the interface set field in the forwarding entry E1 The zth element sends the request message, increments the z value by 1, and executes step 203; Indicates that the value of M1/n1 is rounded up, and U indicates the union operation; Step 205: If the mobile node forwarding the request message or the mobile node connected to the infrastructure equipment link receives the request message from the interface z1, then perform step 210; otherwise, perform step 206; Step 206: After receiving the request message from the interface z2, the infrastructure equipment connected to the mobile node or the infrastructure equipment link forwarding the request message checks its own aggregation table to determine whether there is an interface domain value equal to interface z2, a name domain value and The data block ID set field value is respectively equal to the name field value in the request message and the aggregation entry of the data block ID set field value, if it exists, then perform step 211, otherwise perform step 207; Step 207: The infrastructure device that receives the request message from interface z2 checks its aggregation table to determine whether there is a name field value equal to the name field value in the request message, and the data block ID set field value is the data block ID set of the request message The aggregation table entry of the superset of , if it exists, execute step 208, otherwise execute step 209; Step 208: The infrastructure device that receives the request message from interface z2 creates an aggregation table entry, the interface field value of this aggregation table entry is equal to interface z2, and the name field value and data block ID set field value are respectively equal to the name field in the request message Value and data block ID set domain value, execute step 211; Step 209: The infrastructure device that receives the request message from interface z2 creates an aggregation table entry, the interface field value of this aggregation table entry is equal to interface z2, and the name field value and data block ID set field value are respectively equal to the name field in the request message Value and data block ID collection field value; the infrastructure device checks the interface table, selects the interface entry E2, where interface z2 is an element in the interface collection field of the interface entry E2, and the infrastructure device checks the forwarding table, selects the name field The forwarding entry E3 whose value is equal to the name of the received request message selects the interface z3 that meets the condition 1, forwards the received request message from the interface z3, and executes step 205; Condition 1: The interface is not only an element in the interface set of the interface entry E2, but also an element in the interface set of the forwarding entry E3; Step 210: If the mobile node receiving the request message from interface z1 cannot provide data C1, then discard the request message, otherwise, the mobile node creates a response message, the message format of which is 1, the name field value and data The block ID set field value is the name field value and the data block ID set field value of the received request message respectively, the message type is 3, and the load is the data block set defined by each data block ID in the data block ID set; then from Interface z1 sends the response message; Step 211: If the mobile node U1 receives a response message from the interface z3, then execute step 213, otherwise execute step 212; Step 212: The infrastructure equipment connected to the mobile node or the infrastructure equipment link that forwards the response message receives the response message from its own interface, calls the interface z4, checks the aggregation table, and selects all name field values equal to the The aggregation entry of the name field value of the response message, for each selected aggregation entry, the infrastructure device performs the following operations: If the data block ID set of the aggregation entry is the same as the data block ID set of the received response message If the intersection S1 is not empty, the infrastructure device constructs a response message. The message format of the response message is 1, the name field value is the name field value of the aggregation entry, and the data block ID set is the data block ID of the aggregation entry The intersection S1 of the set and the data block ID set of the received response message, the message type is 3, the payload is the data block set defined by each data block ID in the intersection S1, and the constructed data is sent from the interface field of the aggregation entry In response to the message, the infrastructure device deletes the intersection S1 from the data block ID set of the aggregation entry at the same time, if the data block ID set of the aggregation entry is empty, delete the aggregation entry, and perform step 211; Step 213: after the mobile node U1 receives the response message from the interface z3, check the request table and delete the request entry whose name field value is equal to the name field value of the response message and whose data block ID set is equal to the data block ID set of the response message, If there is no request entry whose name domain value is equal to the name domain value of the response message in the request table of the mobile node U1, then perform step 214, otherwise perform step 211; Step 214: The mobile node U1 constructs all received data blocks into data C1; Step 215: end; In step 210, if the mobile node that receives the request message from interface z1 can provide data C1, and the mobile node fails before sending the response message, the mobile node selects an interface x2 that is in a valid working state, and constructs a A response message is sent from the interface x2, and steps 211-215 are executed to complete the data acquisition process. 3. a kind of new generation network realization method based on multipath according to claim 2, is characterized in that, There are N interfaces in the mobile node U1, the interface j supports the protocol p _j and is connected to the interface link of the infrastructure equipment I2 supporting the protocol p _j , 1≤j≤N, the data C2 is uniquely identified by the name NA2, and M2 Composition of data blocks, the data block ID of each data block is q, and under the condition of 1≤q≤M2, if the mobile node U1 needs to obtain data C2, it will check the forwarding table and select the forwarding table item E5 whose name field value is the name NA2 And obtain the number n5 of elements in the interface set domain value of the forwarding entry E5; if M2 is less than or equal to n5, then the mobile node U1 obtains the data C2 through the following process: Step 301: start; Step 302: The mobile node U1 sets the parameter b to 1, and the parameter b indicates the data block ID of the bth data block of the data C2; Step 303: judge whether the parameter b is greater than M2, if yes, execute step 305, otherwise execute step 304; Step 304: The mobile node U1 checks the request table, selects the interface z5 that meets the condition 2, and creates a request entry. The name field value of the request entry is NA2, the interface field value is z5, and the data block ID set field value is {b }, the mobile node U1 constructs a request message, the message format of the request message is 1, the name domain value is NA2, the data block ID set is {b}, the message type is 2, and the payload is empty, and then sends the request from the interface z5 message; increase the value of b by 1, and execute step 303; Condition 2: Among all the interfaces of the mobile node U1, the number of request entries of the interface set domain value including the interface z5 is the smallest; Step 305: If the mobile node that forwards the request message or the mobile node connected to the infrastructure equipment link receives the request message from its own interface, call the interface z6, then perform step 310; otherwise, perform step 306; Step 306: After receiving the request message from its own interface, the infrastructure device connected to the mobile node or the infrastructure device link forwarding the request message calls the interface z7, and checks its aggregation table to determine whether there is an interface domain The value is equal to the interface z7, and the name field value and the data block ID set field value are respectively equal to the name field value in the request message and the aggregation entry of the data block ID set field value. If it exists, then perform step 311, otherwise perform step 307; Step 307: The infrastructure device that receives the request message from interface z7 checks its aggregation table to determine whether there is a name field value equal to the name field value in the request message, and the data block ID set field value is the data block ID set of the request message The aggregation entry of the superset of , if it exists, execute step 308, otherwise execute step 309; Step 308: The infrastructure device that receives the request message from interface z7 creates an aggregation table entry, the interface field value of the aggregation table entry is equal to interface z7, and the name field value and data block ID set field value are respectively equal to the name field in the request message Value and data block ID set domain value, execute step 311; Step 309: The infrastructure device that receives the request message from interface z7 creates an aggregation table entry, the interface field value of this aggregation table entry is equal to interface z7, and the name field value and data block ID set field value are respectively equal to the name field in the request message value and data block ID set field value, then the infrastructure device checks the interface table, selects interface entry E6, where interface z6 is an element in the interface collection field of interface entry E6, then checks the forwarding table, selects the name field value Equal to the forwarding entry E7 of the name of the received request message, then select the interface z8 that meets the condition 3, forward the received request message from the interface z8, and execute step 305; Condition 3: The interface is not only an element in the interface set of the interface entry E6, but also an element in the interface set of the forwarding entry E7; Step 310: If the mobile node receiving the request message from interface z6 cannot provide the data C2, then discard the request message; otherwise, the mobile node creates a response message, the message format of which is 1, name field value and data The block ID set field value is the name field value and the data block ID set field value of the received request message respectively, the message type is 3, and the load is the data block set defined by each data block ID in the data block ID set; then from Interface z6 sends the response message; Step 311: If the mobile node U1 receives a response message from its own interface, the interface is called interface z8, then execute step 313, otherwise execute step 312; Step 312: The infrastructure equipment connected to the mobile node or the infrastructure equipment link that forwards the response message receives the response message from its own interface, calls the interface z9, then checks the aggregation table, and selects all name field values equal to The aggregation entry of the name field value of the response message, for each selected aggregation entry, the infrastructure device performs the following operations: if the data block ID set of the aggregation entry is the same as the data block ID set of the received response message The intersection S2 of is not empty, then the infrastructure device constructs a response message, the message format of the response message is 1, the name field value is the name field value of the aggregation entry, and the data block ID set is the data block of the aggregation entry The intersection S2 of the ID set and the data block ID set of the received response message, the message type is 3, and the payload is the data block set defined by each data block ID in the intersection S2, and then sent from the interface domain of the aggregation entry For the constructed response message, the infrastructure device deletes the intersection S2 from the data block ID set of the aggregation entry at the same time, if the data block ID set of the aggregation entry is empty, delete the aggregation entry, and execute step 311; Step 313: The mobile node U1 that receives the response message from the interface z8 checks the request table and deletes the request entry whose name domain value is equal to the name domain value of the response message and whose data block ID set is equal to the data block ID set of the response message, if In the request table of the mobile node U1, there is no request entry whose name domain value is equal to the name domain value of the response message, then step 314 is performed, otherwise step 311 is performed; Step 314: The mobile node U1 constructs all received data blocks into data C2; Step 315: end; In step 310, if the mobile node that receives the request message from interface z6 can provide data C2, and the mobile node fails before sending the response message, the mobile node selects an interface x3 that is in a valid working state and constructs a A response message is sent from the interface x3, and steps 311-315 are executed to complete the data acquisition process. 4. a kind of new generation network realization method based on multipath according to claim 3 is characterized in that, there are N interfaces at mobile node U1, and interface f supports protocol p _f and supports protocol p with infrastructure equipment I2 The interface link of _f is connected, under the condition of 1≤f≤N, if the mobile node U1 detects that the interface f1 fails, 1≤f1≤N, the following handover process will be performed: Step 401: start; Step 402: Mobile node U1 checks the request table, selects all request entries whose interface field value is equal to interface f1, and for each request entry, mobile node U1 performs the following operations: mobile node U1 selects interface f2 that meets condition 4, and sets The interface domain value of the request entry is updated to interface f2, and a switching message is constructed. The message format of the switching message is 0, the name is empty, the message type is 4, and the payload is the request entry, and then the request is sent from interface f2 information; Condition 4: Among all the interfaces of the mobile node U1, the number of request entries of the interface set field value including the interface f2 is the smallest; Step 403: After the infrastructure device I2 receives the switching message from the interface f3, it checks the aggregation table, and selects the name field value and the data block ID collection field value equal to the name field value and data block of the request entry in the load of the received switching message The aggregation entry of the ID set, and then update the interface domain value of the aggregation entry to interface f3; Step 404: end.