WO2006086914A1

WO2006086914A1 - A communication system and the interconnecting method thereof

Info

Publication number: WO2006086914A1
Application number: PCT/CN2005/000202
Authority: WO
Inventors: Zhen Tan; Xiaohu Dong; Xinhui Wang
Original assignee: Zte Corporation
Priority date: 2005-02-21
Filing date: 2005-02-21
Publication date: 2006-08-24
Also published as: CN101073232A; CN101073232B

Abstract

A communication system and the interconnecting method thereof. And the system comprises more than one communication domains which has an unique identifier, and said communication domains includes one communication subsystem which has one or more than one communication nodes and a communication gateway module which exchanges information with the communication nodes of the communication subsystem of the domain the communication gateway module belongs to; more than one communication domains setup communication connections through the communication gateway module, and setup a route information table within each communication gateway module at the same time; the communication gateway module informs the domain connection message to the communication nodes within the communication subsystem of the domain the communication gateway module belongs to; the nodes of different domains setup the communication connection. The present invention interconnects the independent systems which are not designed to be the interconnected communication systems without changing the intrinsic communication mechanisms of these systems, can screen the conflicts for communication addressing and the conflicts of the same names in systems using name service without additional management and services and can implement the system interconnection using the intrinsic communication mechanisms.

Description

Communication system and interconnection method thereof

The present invention relates to a communication system and an interconnection method thereof, and particularly to a communication system and an interconnection method for accomplishing information exchange and service discovery between a plurality of communication systems having the same communication mode and having the same naming service. Background technique

A communication system usually consists of several communication nodes, each of which has at least one unique identifier in its communication system for communication addressing. In order to facilitate the specific implementation of the communication, this description is usually generated by a specific sequence, such as an IP address. In actual use, this sequence is not conducive to the expansion and flexible configuration of the system, so a naming service is generated, which provides a mnemonic (name) for the communication node with specific requirements - mapping its communication identifier, The application uses the name to access the communication node, and the conversion of the name and communication representation is done by the naming service before the actual communication.

For communication systems using the same communication mode and naming service, if their usage is completely the same, the mnemonics used in the allocation and naming services of the internal communication identifiers will be basically the same or even identical. The same communication systems must be relatively isolated to prevent communication interference and collisions. If these same communication systems require information interaction, it is necessary to redistribute the identity of the communication nodes for several systems participating in the communication. Two methods are usually used for reallocation. One is to uniformly plan all the communication node identifiers in multiple interconnected systems, and the other is to add a new part based on the original communication identifier, so that the identification of each communication node Not repeated, but these two methods cause changes in the original communication logic, and the information interaction based on the communication identifier is inevitably affected. Impact, especially when the interaction between systems is not the main form, such adjustment is obviously too costly; likewise, for naming services, the same names in different communication systems will conflict after the system is interconnected, resulting in addressing The uniqueness of this is not tolerated by the communication system, and the names of many communication nodes are directly reflected in the application logic. The replacement of the name of the package is not a practical method. The usual solution is to add a global naming service. The conversion of the name and communication identifier between the systems is submitted to the global naming service, and an additional burden is generated. The name resolution resources inside the original system are redundant and cannot be utilized during communication between systems. Summary of the invention

The object of the present invention is to provide a communication system and an interconnection method thereof, which overcomes the adverse effects on the internal communication of the original system when the interconnection between communication systems of the same communication mode is currently implemented, and prevents the internal system from being communicated between the systems. The conflict of naming services, based on the internal communication mechanism of the original system, uses the internal communication mechanism of the original system to realize the interconnection of multiple communication systems.

In order to achieve the above object, the present invention provides a communication system, and the present invention defines a communication domain concept. Each communication domain includes a communication subsystem, and the communication domain is distinguished by a unique identifier in each communication domain. A communication gateway module is set up, and the communication gateway module uses the original internal communication mechanism of the communication nodes of the communication domain, and the information interaction between the communication gateway modules of each communication domain constitutes an interconnection between communication domains. The communication gateway module completes the virtual communication connection between the internal nodes of the subsystem and the communication nodes of other communication subsystems, and acts as a conversion adapter for the communication protocol between different communication subsystems; the communication system of the present invention includes more than one communication domain The communication domain has a unique identifier, and the communication domain includes a communication subsystem and a communication gateway module, and the communication gateway module exchanges information with a communication node in a communication subsystem of the communication domain in which it is located. The communication node and the communication gateway module both include an application function module and a domain. a communication driver module and an internal communication driver module, wherein the communication gateway module further comprises a transmission module for inter-domain communication and a reception module for inter-domain communication; and the application function module is configured to transmit to the domain communication driver module that the device needs to be sent The message or the message received from the domain communication driver module is used; the domain communication driver module is configured to package the sent message and then transmit the message to the internal communication driver module, or process the received message, and then extract the domain related message to An application function module; the internal communication driver module is configured to send a message to a communication node inside the communication system and receive a message sent by the internal communication node; and the sending and receiving module of the inter-domain communication is used to complete the inter-domain message. Send and receive.

The invention also provides a method for interconnecting the above communication system, comprising the following steps:

Step 1: One or more communication domains establish a communication connection through the communication gateway module, and establish a routing information table in each communication gateway module. The routing information table includes a target domain and a link identifier, and is used to save and communicate with the communication. The communication domain where the gateway module is located establishes the communication domain name and link identifier of the communication link;

Step 2. The communication gateway module notifies the communication node of the communication subsystem in the communication domain of the communication domain in the communication connection message;

Step 3. The communication nodes of different communication domains establish a communication link.

In the communication system of the present invention, the communication subsystems in different communication domains are independent communication systems, and may be systems with the same communication mode or systems with different communication modes. The present invention is applicable to interconnecting independent systems not designed to interconnect communication systems without altering the original communication mechanisms of these systems. Existing communication interconnection systems require that interconnections between systems must be considered at the beginning of system design. Even if these systems do not participate in system interconnection in the future, they must be affected by the interconnection requirements in the later transformation. Transformation of communication mechanism; the present invention The method can shield the conflict of communication addressing when the same communication mode system is interconnected. In the system using the naming service, the conflict of the same name can be avoided, and the present invention does not need to provide additional management and services, and utilizes the original communication. Mechanisms enable system interconnection. DRAWINGS

Figure 1 is a schematic structural view of the system of the present invention;

Figure 2 is a flow chart of the method of the present invention;

3 is a schematic diagram of a system in which the system of the present invention adopts a mesh type interconnection manner;

4 is a schematic diagram of a system in which the system according to the present invention adopts a tree interconnection method;

FIG. 5 is a schematic structural diagram of a communication node in a system according to the present invention; FIG.

6 is a schematic structural diagram of a communication gateway module in a system according to the present invention;

7 is a schematic diagram of a format of a message transmitted in the method according to the present invention;

8 is a schematic diagram of a format of a message transmitted between communication nodes in the system of the present invention;

FIG. 9 is a schematic diagram showing the format of a message transmitted between two communication gateway modules in the present invention. detailed description

The invention defines a communication domain concept, the communication domain is distinguished by a unique identifier, each communication domain comprises a communication subsystem, and a communication gateway module is set in each communication domain, the communication gateway module and the communication domain The internal information exchange of each communication node adopts the original internal communication mechanism of the subsystem. Each communication domain forms the interconnection between the communication domains through the information interaction between the communication gateway modules. The communication gateway module completes the internal nodes and other communication sub-systems of the subsystem. A virtual communication connection between system communication nodes and acting as a conversion adapter for communication protocols between different communication systems. As shown in FIG. 1, the communication system of the present invention includes more than one communication domain 100, 200, 300, 400, as described The communication domain has a unique identifier, and the communication domain includes one or more communication nodes

Nodel, a communication subsystem 110 of Node2 and a communication gateway module Gate 1, the communication gateway module Ga t e 1 interacts with the communication nodes Nodel and Node2 in the communication subsystem 110 of the communication domain in which it is located. Each communication domain forms an interconnection between communication domains through the information exchange of its respective communication gateway modules.

The flow of the method of the present invention is shown in Figure 2 and includes the following:

In step 1, the communication gateway module connects the communication domains, and the establishment of the link can be performed in two ways, one is a network interconnection manner, as shown in FIG. 3; The interconnection method is shown in Figure 4. The network interconnection mode, that is, one or more communication domains are interconnected by a communication gateway module and a communication gateway module of another communication domain to form a mesh, and the communication gateway module periodically sends a broadcast message to the outside periodically during its lifetime. The message includes the domain identifier of the communication domain in which it is located, and listens to the broadcast message sent from the outside, and determines whether the domain identifier in the received broadcast message is the target domain in the routing information table. If not, the domain is indicated. If there is no contact with the domain, a link establishment request is initiated to the communication domain that sends the broadcast message, a communication link is established with it, and the routing information table is updated. If yes, it indicates that the domain has been linked with the domain, and does not respond. Broadcast elimination The tree interconnection means that any one communication domain is used as the first layer communication domain, the first layer communication domain is connected to more than one communication domain, and the communication domain is used as the communication domain of the second layer. Each second layer communication domain is connected to more than one communication domain, and the communication domain is used as a communication domain of the third layer, and each third layer communication domain is connected to more than one communication domain, and the communication domain is used as the communication domain of the fourth layer. And so on to form a tree, specifically how many layers, how many communication domains are connected to each layer, depending on the specific circumstances. At the same time that the communication gateway module connects the communication domains, a routing information table is also established in each communication gateway module, and the routing information table includes a target domain and a link identifier, and is used for saving communication with the communication gateway module. The domain establishes the communication domain name and link identifier of the communication link. Referring to FIG. 4, the routing information table of some of the communication domains is as shown in Table 1.

Table 1

Domain 1 Route Table

No Target Domain Link ID

1 Domain 1 Inner Link

2 Domain2 Linkl-2

3 Domain3 Linkl-3

4 Domain4 Linkl-2

5 Domain5 Linkl-2

6 Domain6 Linkl-3

Domain2 Route Table

No Target Domain Link ID

1 Domainl Linkl-2

2 Domain2 Inner Link

3 Domain3 Linkl-2

4 Domain4 Link2-4

5 Domain5 Link2-5

6 Domain6 Linkl-2

Domain4 Route Table

No Target Domain Link ID

1 Domainl Link2-4

2 Domain2 Link2-4

3 Domain3 Link2-4

4 Domain4 Inner Link

5 Domain5 Link2-4

6 Domain6 Link2-4 Taking communication domains 1, 2, and 4 as an example, referring to Figure 4, communication domain 1 is the first layer communication domain, communication domains 2, 3 are the second layer communication domain, and communication domains 4, 5, and 6 are the third layer communication domain. The communication domain 1 is directly connected to the communication domains 2, 3, and is connected to the communication domain 4, 5 via the communication domain 2, and is connected to the communication domain 6 via the communication i or 3, so when the communication domain 1 and the communication i or 2, 3, 4, 5, 6 When establishing a connection, it can be directly connected to the communication domains 2, 3, but the communication domain 2 is connected with the communication domains 4, 5, and the communication domain 3 is connected with the communication domain 6, so when When the target domain of the connection is the communication domain 2 or 3, the link identifiers are Linkl-2 and Linkl-3 respectively. When the target domain to which the connection is the communication domain 4 or 5, the link identifier is still Linkl-2. When the target domain to which it is connected is the communication domain 6, its link identifier is still Linkl-3.

Similarly, if communication domain 2 establishes a connection with communication i or 1, 3, 4, 5, 6, when the target domain to which it is connected is communication domain 4, 5, the link identifiers are Link2- 4, Link2- 5, when the target domain to which it is connected is the communication domain 1, 3, 6, its link identifier is Linkl - 2.

Similarly, if the communication domain 4 establishes a connection with the communication domains 1, 2, 3, 5, 6, the link identifiers are all Link2-4.

If the target domain is the local area, the link identifier is Inner Link, and the message is sent to the internal system through the link.

When the communication gateway module connects the communication domains, the communication gateway module sends a domain connection message notification to the communication node of the communication domain in which it is located. For the network connection mode, the communication gateway module communicates with all communication domains in the communication domain at the time of link establishment. The node broadcasts the domain connection message notification, and may also provide a query interface for the newly added communication node in the communication subsystem to query the connected domain, or when the internal communication node does not respond to the broadcast message. You can also actively query the inter-domain link connection through the query interface when needed; for the tree connection mode, The gateway module broadcasts the domain connection message notification to all communication nodes in the communication system of the communication domain where the link is established, and determines whether the communication domain in which the communication domain is located is the lowest layer of the established communication connection, and if not, Passing the connection message to all communication domains of the next layer connected thereto, and maintaining the routing information table information inside the communication gateway module, and determining the routing information table when establishing and disconnecting with other non-directly connected communication domains. The information in it correctly reflects the link state changes between any two domains in the entire system. Tree connection is a relatively simple connection method. There is no duplicate link. Therefore, the routing table changes only when the inter-domain link is established and disconnected. However, when establishing and disconnecting, any two of the entire system are created. The link state between domains changes, not just the contiguous domain that has a physical connection directly with the domain. If yes, the process ends; wherein the domain connection message notification includes at least a domain identifier of a communication domain with which a communication connection is established. The domain connection message notification may also include some messages required by the application layer, so that the application not only obtains the domain identifier required for subsequent inter-domain communication, but also identifies the application logic of each connection domain through the application layer message bound thereto. The layer establishes its connection relationship.

Similarly, when a link break occurs between systems, a similar message notification is also required.

After the communication gateway module notifies the communication node of the communication domain in the communication domain of the communication domain, the communication node saves or does not save the connection message, and the communication node saves the inter-domain link state by setting the communication form of the destination domain. The logical link establishment between the communication nodes is performed; if not saved, the communication node needs to establish a logical communication link with the communication nodes in other communication domains through the inter-domain broadcast.

The communication link between the communication node and the communication nodes in other communication domains is:

The communication node sends a message to the communication gateway module of the communication domain in which it is located, where the message includes the domain identifier of the communication domain in which it is located; The communication gateway module broadcasts the received message according to the link identifier in the routing information table to the communication domain with which the communication is connected; if the format supported by the internal communication protocol of the domain is different from the format of the inter-domain communication protocol, the communication interface needs to be received. The message sent by the communication node is converted into a format supported by the inter-domain communication protocol;

The communication gateway module connected to the communication node monitors the sent broadcast message, and sends the broadcast message to the communication node of the communication domain where the communication node sends a response, and the response of the receiving communication node is sent to the sending node. The communication node of the end responds according to the source address (including the source domain representation) information in the received message, and the response message is also transmitted as the message of the inter-domain communication.

For the tree connection mode, after the communication gateway module monitors the sent broadcast message, it determines whether the domain identifier in the broadcast message is the same as the communication domain in which the broadcast message is located. If not, the communication gateway module follows the broadcast message according to the communication message. The correct link identifier of the internal routing information table is forwarded to the peer communication gateway module through the inter-domain link, and the peer communication gateway module determines whether the domain identifier in the broadcast message is the same as the communication domain in which the broadcast message is located, if not The same, then send down until the same communication domain as the domain identifier in the broadcast message is found, the broadcast message is sent to the communication node of the communication domain in which it is located, and the communication node sends a response, thus establishing the communication node and communication The communication connection of the node.

The broadcast message is converted into a format supported by the intra-domain communication protocol before being sent to the communication node of the communication domain in which it is located, and if the receiving communication node address included in the message is a logical name, The communication gateway translates the logical name into a physical communication address through its system internal name service.

When the communication connection between the communication node and the communication node is established, the communication node can exchange information with the communication node in other communication systems. In order to complete the establishment of the above communication link, the structure diagram of the communication node in each communication subsystem is as shown in FIG. 5, including the application function module 1, the domain communication driver module (DCD) and the internal communication. The driver module (the inner-Domain Communication Driver is called ICD), the domain communication driver module includes an Inter-domain Communication Interface (DCD-API) 21 and or The internal communication driver module includes an Inner-Domain Communication Driver-Appliable Program Interface (ICD-API) 31 and Inner-Domain Communication Driver- Adaptor (ICD-ADP) 32; The structure of the communication gateway module is basically the same as that of the communication node, and its structure is shown in Figure 6, including application functions. Module 1', domain communication driver module, internal communication driver module, transmission module for inter-domain communication DCD-S) 41, and a receiving module (DCD-R) 42' for inter-domain communication, the application function module 1' is used for routing query, judgment and name conversion in the naming service; the transmitting module 41 for inter-domain communication And the receiving module 42 of the inter-domain communication respectively maintains the transmission and reception of the inter-domain communication link. For the communication node, when transmitting the message, for intra-domain communication, the DCD-API 21 provides the same interface as the ICD-API 31, and the DCD-API 21 receives the transmission message of the application function module 1, and transparently transmits the transmission message to the internal communication driver. Module; then pass the message to other nodes in the domain;

For inter-domain communication, the ICD-API 31 provides a corresponding messaging interface for use by the DCD, and the application function module 1 transmits the message to be sent to the DCD through the DCD-AP 121, and wraps the sent message (ie, adds/packages the inter-domain The message header is passed to the ICD-API 31, and the ICD-API 31 sends the message to the communication gateway module of the communication domain where the communication node is located. When receiving a message, for intra-domain communication, all intra-domain messages are transparently transmitted to the application function module via ICD-ADP 32, DCD-ADP 22;

For inter-domain communication, the inter-domain message is passed to the DCD-ADP 22 via the ICD-ADP 32, processed in the DCD-ADP 22, and the domain-related message is extracted and provided to the application function module 1.

The domain communication driver module 2 is configured to provide an inter-domain messaging interface (DCD-GAPI) 21' and an inter-domain message acceptance adaptation (DCD-GAPT) 22 to the application function module 1 in the communication gateway module, and the internal communication The driver module includes an intra-domain communication driver interface (ICD-GAPI) 32' and an intra-domain communication driver adaptation (ICD-GADP) 32',

When the intra-domain message arrives at the communication gateway module, the intra-domain message reaches the application function module 1 of the communication gateway module through ICD-GAPI 32' and DCD-GAPT 22'; the application function module 1' queries the IP address according to the destination domain address in the message. The internal maintenance routing table determines the sending link. When there is a link to the destination domain in the routing table, the application function unit sends the message through the DCD-S 41' after the message is encapsulated.

When sending a message from outside the domain to the domain, when the out-of-domain message passes through DCD-R 42, to the communication gateway module, the message is received by the application function module 1, and the corresponding conversion is performed; after the message processing is completed, the function module 1 is applied, and the DCD is applied. -GAPI21', port ICD-API 31, sent to the communication node in the domain.

For the format of the message in the present invention, as shown in Figs. 7, 8, and 9, each message is composed of a message header a and a message body b, as shown in Fig. 7. The format of the message transmitted between the internal communication nodes of the system is "Internal Communication Header (IC-MSG-HEADER)" + "Message Body (MSG-BODY)", as shown in Figure 8; internal communication node and communication gateway module The message transmission follows the internal communication mechanism, so its format does not change, only the "inter-domain communication message header (DC-MSG-HEADER)" is handled as part of the message body; the transmission format of the message between the two communication gateway modules As shown in Figure 9, the domain will be The intercommunication message header "with" the internal communication header" is synthesized for the unified message header a.

It should be noted that the above embodiments are merely illustrative of the present invention and are not intended to limit the technical solutions described herein; therefore, although the present specification has been described in detail with reference to the various embodiments described above, It is to be understood that the invention may be modified or equivalently modified without departing from the spirit and scope of the invention.

Claims

Rights request

A communication system, comprising: more than one communication domain having a unique identifier, the communication source or a communication subsystem having one or more communication nodes and a communication gateway module, the communication gateway module The communication node and the communication gateway module include an application function module, a domain communication driver module and an internal communication driver module, wherein the communication gateway module further includes a transmitting module for inter-domain communication and a receiving module for inter-domain communication;

The application function module is configured to transmit a message to be sent to the domain communication driver module or receive a message transmitted from the domain communication driver module;

The domain communication driver module is configured to package the sent message and transmit the message to the internal communication driver module; or after processing the received message, extract the domain related message and transmit the message to the application function module; the internal communication driver module is used for Sending a message to a communication node inside the communication system and receiving a message sent by the internal communication node;

The transmitting and receiving module of the inter-domain communication is used to complete the sending and receiving of inter-domain messages.

2. The communication system according to claim 1, wherein the domain communication driver module of the communication node comprises a DCD-API and a DCD-ADP, and the internal communication driver module comprises an I CD-API and an ICD-ADP. ,

When sending a message, for intra-domain communication, DCD-API provides the same interface as ICD-API, DCD-API receives the sending message of the application function module, and transparently transmits the sending message to the internal communication driver module;

For inter-domain communication, the ICD-API provides a corresponding message sending interface to the domain communication driver module, and the DCD-API receives the sending message of the application function module through the inter-domain message sending interface, and sends the message. Message encapsulation/adding inter-domain headers to the internal communication driver module;

When receiving a message, for intra-domain communication, all intra-domain messages are transparently transmitted to the application function module through ICD-ADP and DCD-ADP;

For inter-domain communication, inter-domain messages are passed to DCD-ADP via ICD-ADP. In DCD-ADP processing, domain-related messages are extracted and provided to the application function module.

3. The communication system according to claim 1 or 2, wherein the domain communication driver module of the communication gateway module comprises DCD-GAPI and DCD-GAPT, and the internal communication driver module comprises I CD-API and ICD-ADP. ;

When a message is sent from the domain to the outside of the domain, when the intra-domain message reaches the communication gateway module, the intra-domain message reaches the application function module of the communication gateway module through ICD-ADP and DCD-GAPT; the application function module queries the message according to the destination domain address in the message. The internal maintenance routing table determines the sending link. When there is a link to the destination domain in the routing table, the application function module encapsulates the message, and sends the message through the sending module of the inter-domain communication;

When the message is sent from the out-of-domain to the domain, after receiving the out-of-domain message through the receiving module of the inter-domain communication, the message is transmitted to the application function module, and the application function module performs corresponding processing; the processed message is processed by the application function module. Send to the communication node in the domain through DCD-GAPI and ICD-API.

A communication system interconnection method, characterized in that: the communication system comprises more than one communication domain having a unique identifier, the communication domain comprises a communication subsystem and a communication gateway module, and the communication gateway module The communication node interaction information in the communication subsystem of the communication domain, the method includes the following steps:

Step 1. More than one communication domain establishes a communication connection through the communication gateway module, and at the same time A routing information table is established in the communication gateway module, and the routing information table includes a target domain and a link identifier, and is used to save a communication domain name and a link identifier of a communication link with a communication domain where the communication gateway module is located;

Step 2. The communication gateway module notifies the communication domain connection message to the communication node inside the communication subsystem of the communication domain;

The method for interconnecting communication systems according to claim 4, wherein one or more of the communication domains in the step 1 establish a communication connection through a communication gateway module, and the one or more The communication domain is interconnected by a communication gateway module to form a mesh, and the communication gateway module periodically sends a broadcast message to the outside during the lifetime thereof, the message includes the domain identifier of the communication domain, and at the same time, listens to the broadcast message sent from the outside, and Determining whether the domain identifier in the received broadcast message is the target domain in the routing information table, and if not, initiating a link establishment request to the communication domain that sends the broadcast message, establishing a communication link with it, and updating its routing information table, If yes, the broadcast message is not responded to.

The method for interconnecting communication systems according to claim 4, wherein one or more communication domains in the step 1 establish a communication connection through a communication gateway module in a tree connection manner, to any one of The communication domain is used as the first layer communication domain, the first layer communication domain is connected to one or more communication domains, the communication domain is used as the second layer communication domain, and the communication domain of the second layer communication domain is connected to one or more communication domains. The communication domain, the communication domain acts as a layer 3 communication domain, and thus forms a tree.

7. The method for interconnecting a communication system according to claim 5, wherein the process of the communication gateway module in step 2 notifying the communication domain connection message to the communication node of the communication subsystem in the communication domain is: The communication gateway module communicates to the communication domain of its communication domain at the time of link establishment. All the communication nodes in the system broadcast the communication domain connection message, and the communication domain connection message includes the domain identifier of the communication domain with which the communication connection is established.

8. The method for interconnecting communication systems according to claim 6, wherein the process of the communication gateway module in step 2 notifying the communication domain connection message to all communication nodes in the communication system of the communication domain in which it is located is: The communication gateway module broadcasts the communication domain connection message to all communication nodes in the communication system of the communication domain where the communication gateway is located, and determines whether the communication domain where the communication gateway module is located is the last layer of the established communication connection. And if not, transmitting the connection message to the next layer of communication domain connected thereto, and updating the routing information table, and if yes, ending; wherein, the communication domain connection message at least includes establishing a communication connection with the communication domain The domain ID of the communication domain.

The method for interconnecting communication systems according to claim 7, wherein the communication gateway module broadcasts the communication domain connection message to all communication nodes in the communication system of the communication domain in which the communication domain is located at the link establishment time. At the same time, the query interface is provided for the new communication node in the communication subsystem where the communication subsystem is located to query the connected domain, or when the internal communication node does not respond to the broadcast message, actively use the query interface to perform the domain when needed. Query of the link connection situation.

The method for interconnecting a communication system according to claim 7, 8 or 9, wherein the communication domain connection message further comprises an application layer message for identifying application logic of the connected communication domain, Establish a connection relationship at the application layer.

The method for interconnecting communication systems according to claim 4, wherein the step of establishing a communication link by the communication nodes of different communication domains in the step 3 includes the following steps:

Step 3a: The communication node in any communication domain sends a message to the communication gateway module of the communication domain in which it is located, where the message includes the domain identifier of the communication domain in which it is located; Step 3b, the communication gateway module receives the message and broadcasts the received message to a communication domain connected to the communication link according to the link identifier in the routing information table;

Step 3c: The communication gateway module monitors the sent broadcast message, and sends the broadcast message to the communication node in the communication subsystem of the communication i or the communication.

The method for interconnecting a communication system according to claim 11, wherein in the step 3b, the received message is broadcasted to the communication domain connected to the communication domain according to the link identifier in the routing information table. The received message sent by the correspondent node is converted into a format supported by the inter-domain communication protocol.

The method for interconnecting a communication system according to claim 11, wherein the communication gateway module in the step 3c listens to the sent broadcast message, and then sends the broadcast message to the communication in the communication domain where it is located. The communication node in the subsystem also includes the following steps:

Step 3cl: The communication gateway module determines whether the domain identifier in the broadcast message is the same as the communication domain in which the communication gateway module is located. If the same, the broadcast message is sent to the communication subsystem of the communication domain in which it is located. Communication node; if not the same, perform the next step;

Step 3c2: The communication gateway module forwards the broadcast message to the peer communication gateway module through the inter-domain link according to the correct link identifier of the internal routing information table, and performs step 3cl.

The method for interconnecting communication systems according to claim 11, 12 or 13, wherein in the step 3c, the broadcast message is sent to a communication node in a communication subsystem of a communication domain in which it is located, The received broadcast message is converted to a format supported by the domain internal communication protocol.

The method for interconnecting a communication system according to claim 14, wherein in the step 3c, the broadcast message is sent to a communication node in a communication subsystem of a communication domain in which it is located, if the message includes Accepting the communication node address as a logical name, then the communication gateway module The logical name is converted to a physical communication address by its internal system name service.

The method for interconnecting communication systems according to claim 4, 5, 6, 7, 8, 9, 11, 12, 13 or 15, characterized in that: said communication nodes, communication nodes and communication gateways The message transmitted between the modules and between the two communication gateway modules includes a message header and a message body. For the message transmitted between the communication node and the communication gateway module, the inter-domain communication message header DC-MSG-HEADER is used as a message. Part of the MSG-BODY; For the messages transmitted between the two communication gateway modules, the inter-domain communication header DC-MSG-HEADER and the internal communication header IC-MSG-HEADER are combined into a unified header.

The method for interconnecting communication systems according to claim 10, wherein the messages transmitted between the communication nodes, between the communication node and the communication gateway module, and between the two communication gateway modules include a message header and Message body, for the message transmitted between the communication node and the communication gateway module, the inter-domain communication message header DC-MSG-HEADER is used as part of the message body MSG-BODY; for the message transmitted between the two communication gateway modules The inter-domain communication header DC-MSG-HEADER and the internal communication header IC-MSG-HEADER are combined into a unified header.

The method for interconnecting communication systems according to claim 14, wherein the messages transmitted between the communication nodes, between the communication node and the communication gateway module, and between the two communication gateway modules include a message header and Message body, for the message transmitted between the communication node and the communication gateway module, the inter-domain communication message header DC-MSG-HEADEIH is part of the message body MSG-BODY; for the message transmitted between the two communication gateway modules The inter-domain communication header DC-MSG-HEADER and the internal communication header IC-MSG-HEADER are combined into a unified header.