KR910007715B1 - Method for connecting nodes between communication networks - Google Patents

Abstract

The method detects the dynamic connection of new node connected to the activated network and forms a protocol having the connection information. The newly formed physical link by the new node connection is activated and supervised by the method. The method comprises steps: (A) sending the link activation instruction to a link activating module when a new node detection message is received and then standing-by until the response message is transmitted by the module; (B) sending the link activation instruction until the link activation success message is received; (C) transmitting the connection completion message to a link supervising module, (D) setting the link and the state field on a network state table when the connection completion message is received, and sending the identification request message to the newly connected node; and (E) recoding the node number of identification message on the network state table.

Description

Switching Network Node Connection Process

1 is the connection network of each node.

2 is a system block diagram of each node shown in FIG.

3 is a software module structure diagram for connection processing between nodes according to the present invention.

4 is a flowchart of a link management module according to the present invention.

5a, b is a transmission, reception flow diagram of the network management module according to the present invention.

6 is a block diagram of a network connection state table according to the present invention.

7 is a message format used in the present invention.

* Explanation of symbols for main parts of the drawings

NodeA-NodeE: Node 10: Call Processing Module

20: memory 30: clock module

40: subscriber control module 50: switching module

60: other node interface

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for handling the connection of a new node in a telecommunication network having a switch as a node, and more particularly to a method for handling the connection of a new node in a communication network in which the structure of the node is dynamically converted.

The communication network is a comprehensive system in which a plurality of exchange systems having exchange and communication control functions, that is, nodes are connected through a reliable communication link to perform various information exchanges. When the existing communication network exists, the connection of the new node should be made without reducing the structure and function of the existing network.

In the conventional switching network, a new node connection can be controlled in a controlled form only when the switching network and the identity of the access node and the identity of the access node are known in advance.

However, as described above, the method has a limit that cannot be replaced at all in a dynamic change situation in which the new node is connected, the timing of the connection, and the identity of the access node.

Therefore, when a node of the present invention is interconnected and a new node is connected to an activated switching network, a method of handling a new node connection by constructing a protocol that dynamically detects a new node connection and reflects it in network structure information In providing.

Another object of the present invention is to provide a link management method for dynamically detecting a new node connection, activating a set link when a physical link is established, and performing link management by logically verifying a signal link.

Another object of the present invention is to provide a network management method for recognizing the identity of a new node by transmitting a predetermined message with a newly connected node when establishing a new link for a new access node.

Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings.

1 is a connection network between each node having a switch as a node, where NodeA-NodeE represents each node, of which NodeA-NodeE is an active switching network and NodeE is newly connected to NodeA. The node to be done. In the above, the node refers to an exchange that can provide a service service to any subscriber.

2 is a system block diagram of each node (NodeA-NodeE), a call processing module 10 having a central processing unit and controlling the overall call processing of the system, and the control of the call processing module 10. The memory device 20 for accessing the data, the clock module 30 for generating a clock having a predetermined state period and providing the call processing module 10 to the call processing module 10, and controlling subscribers to provide predetermined information to the call processing module. Subscriber control module 40 to report to (10), and the switching module is switched by the control of the call processing module 10 to provide a call path of the subscriber module 40 and to form a call path of a predetermined state ( 50) and another node interface (MLI) 60 connected between the switching module 50 and the other node to interface signaling and data between the other node and the system by a predetermined control, and the other node interface 60. Is created when a new signal link is It consists of the signaling module 70 for performing link management, and network management by the leg (flag).

In the configuration as shown in FIG. 1, the other node 60 has a link for connecting another node. When the other node's link is connected to the link, the other node 60 detects the connection of the other node in hardware. Link connection flags (0111, 1110) (7EH in hexadecimal) are transmitted and received between nodes through the connected link. When the access flag (0111, 1110) is received through the connected link it is input to the signaling module 70.

3 is a software module for connection processing between nodes according to the present invention, and is composed of an interrupt module, a link management module, a link activation module, and a network management module, which exist in the signaling module 70 of each node system.

At this time, each module performs the following functions.

(1) Interrupt module for flag detection: Connection flags (0111, 0110) (7EH) generated in hardware at the other node interface 60 as a previous step for message transmission when a new signal link is connected according to a new node connection. Detection, that is, when the access flags (0111, 1110) output from the other node interface 60 is received, a "flag detection message" is generated and transmitted to the link management module.

(2) Link Management Module: If it is known that the physical link is established by the "flag detection" message transmitted from the interrupt module, the link management module sends a 'link activation' message to the link activation module. To activate the link. In this case, link activation means that a message can be transmitted without loss by logically verifying and establishing a physically established signal link.

(3) Link Activation Module: Link Activation Module implements status transition through peer-to-peer entity (corresponding link activation module of corresponding node) and message sending / receiving (LSSU). To activate the link.

From the link activation module's point of view, the state of the link is

-Out-of-service

-Not-aligned

-Aligned

-Aligned-Ready, Aligned-Not-Ready

-In-Service is divided into five types. The status of the link activation module as described above is related to events such as message type, error occurrence frequency, and flag lost frequency from other nodes. By transition. When the link activation module receives an activation instruction from the link management module, the status is 'Out-of-Service'. If the activation is successful, the status is 'In-Service'.

The above activation process is performed according to the level 2 recommendation in Q.7, 03 (Volume 6-Fascicle 7, Q.7, 03) of CCITT Recommendation Volume 6, Part 7. do.

(4) Network management module: When the interrupt module, link activation module, and link management module are normally operated and a new signal link is established between their own node and another node, it transmits and receives a prescribed message to congestion between newly connected nodes. Find out.

In FIG. 3, message transmission and reception between the interrupt module, the link management module, the link management module, the link activation module, the link management module, and the network management module are performed as shown in FIG.

4 is a detailed flow diagram of the link management module of FIG. 3 according to the present invention. When a "flag detection message" output from an interrupt module is connected to an arbitrary node and outputs a "link activation message" to the link activation module, In step 1, the link activation result message waits until the arrival of the link activation result message. The second step of the repetitive transmission, and the third step of outputting a message informing the new node connection to the network management module, the link state is made available when successful activation in the search process in the second step.

5 (a) is a detailed flowchart of the network management module, and is a flowchart of the transmitting side. In the above flow, when a message of a new node arrives from the link management module, the first step of setting a link number and a link state in the network connection status table and sending and waiting a message asking for the identity of the connected node is performed. A message identifying the congestion takes place in the second step of recording the connection node in the connection node field of the network connection status table upon arrival.

5 (b) is a flowchart of the network management module, and is a flowchart of the receiving side. It receives a message asking for the identity of a node and sends a message containing its identity.

FIG. 6 is a structural diagram of a network connection state table, which is a memory map including a plurality of records consisting of a link number field, a link state field, and a connection node field, and the record is a link established in the other node interface 60 of FIG. As many as many are set in the memory in the signaling module 70.

Each field in FIG. 6 is set to a size of 1 byte, and when set to such a size, the total size of the network connection state table is the maximum number of links that can be connected to the node. It will be the size of bytes.

The first field of each record (i, in-1, in) is a byte indicating a link number, the second field is a byte indicating a link status, and the last field is a byte indicating a node number connected through a link. .

7 is a message format used in the present invention, which consists of a total of six bytes, and the area of each byte is as follows.

MFLAG: Byte to distinguish start of message

LENGTH: a byte indicating the length of the message

MSG.ID: Byte indicating type of message

LINK: a byte representing the link number

OPC: byte indicating the exchange node number that sent the message

DPC: Byte indicating exchange node number to receive message

The message format shown in FIG. 7 is used when sending and receiving messages between the interrupt module, the link management module, the link management module and the link activation module, and the link management module and the network management module of FIG. At this time, MFLAG of the message bytes is set to FEH (1111, 1110), and LENGTH is set to 06H (0000,0110) because the message format of FIG. 7 is 6 bytes in total. MSG indicating the type of message. ID indicates that the message of FIG. 7 is a status message. If the value is 01H, it indicates “Flag detection message”, and if it is 02H, it indicates “Link Activation Instruction Message”. 04H indicates "link activation failure message", 05H indicates "new node access message", 06H indicates "WHO ARE YOU message", and 07H indicates "I AM message".

Therefore, the data of the message format of FIG. 7 is MSG. The contents of the ID data indicate what kind of message it is.

Hereinafter, in the present invention, for convenience of explanation, each message is referred to as {MFLAG, LENGTH MSG. ID, LINK, OPC, DPC} will be described by displaying the above-described data.

An operation example of the present invention will be described with reference to FIGS. 1 to 7 described above.

Now, in the node connection switching network as shown in FIG. 1, when a link of a new node NodeE is connected to a connection link of a node NodeA by a line (communication path), another node interface inside each of the nodes NodeA and NodeE 60 detects the connection of the line by hardware, and sends out connection flags 0111 and 1110 (7EH) to the connected line.

Accordingly, the other node interface 60 of the node NodeA receives the connection flags 0111 and 1110 transmitted from the node NodeE, and the other node interface 60 of the node NodeE transmits from the node NodeA. Receive connection flags (0111, 1110). The other node 60 of the node NodeA that receives the access flags 0111 and 1110 transmits the flags 0111 and 1110 to the signaling module 70. At this time, the interrupt module in the signaling module 70 knows that a new node is connected when the 'hardware flags 0111 and 1110' outputted from the other node interface 60 are transmitted. Links in this state are called physical links. When each interrupt module of NodeA NodeE receives a 'hardware flag', each of the interrupt modules formats the "flag detection message" into the message format of FIG. 7 to signal the module 70 in each node. Send it to the link management module in. That is, when the flags (0111, 1110) are received, the interrupt module formats the 6-byte data shown in FIG. 7 with the value of MSG.ID described in FIG. 7 as "01H" as follows.

(01H indicates that the data of the message format of FIG. 7 as MSG.ID is a flag detection message.

At this time, if the node NodeA has its own node number '1' and the link number physically connected to the node NodeE is '2', the node number '01H' and the link number will be '02H'. This is because the interrupt module in the own node transmits the message to the link management module of the own node because the node number is written in the OPC and DPC in the flag detection message.

As described above, when the interrupt module in each node NodeE sends the "flag detection message" to the link management module, the link management module in each node transmits the? FEH, 06H, 01H, link number, child node number, and child node number “flag detection message” is received.

In step 4a, the link management module receiving the “flag detection message” formats the link activation message in the message format as shown in FIG. 7 to the link activation module and waits for the link activation result message in step 4c. Enter

Formatting of the activation message in step 4b is as follows.

On the other hand, the link activation module of each node that has received a message from the link management module in each node has various link state according to the level 2 recommended in CCITT, Q.7, 30 of Recommendation Volume 6 By sending and receiving a signal unit), the link is activated. In this case, the link activation means that the link activation module in the signaling module 70 in each NodeA nodeNodeE transmits / receives the LSSU signal defined in CCITT level 2 through a connection link of another node interface 60. Then, CRC (Cyclic Redundancy Cheek) is performed to check an error occurrence frequency (transmission / reception error).

If the activation of the activation is terminated according to the link activation protocol (CCITT Level 2) already established, the link activation module formats the "link activation result message" according to the activation link result into the message format of FIG. 7 to inform the link management module of this fact. By notifying and providing the activated logical link service to the upper layer, the necessary operation according to the new node connection is completed.

The link activation result message is formatted as an activation success message and an activation failure message according to the transmission / reception error state of the LSSU signal. The message is as follows.

If the link activation result arrives in step 4d, the link management module of FIG. 3 analyzes the "link activation result message" received in step 4e to search whether the activation is successful.

If the MSG.ID data is '04H' in step 4e, it is determined that the link activation has failed, and the "activation message" is repeated n times until the link activation is successful. After transferring to the jump to step 4c.

If the MSG.ID data is " 03H ", the link activation result is determined to be successful. In step 4e, the link management module determines that the link activation is successful, and in step 4g, a link state bit in each memory area in the memory area of the signaling module 70 of FIG. 2 is available (In-Service State). bit). At this time, the link state bit is searched and set as the link number included in the link activation result message transmitted from the link activation module. The link state bit is configured as a bitmap in the memory of the signaling module 70 by the number of links of the other node interface 50. In step 4g, the link management module that sets the link status bit of the corresponding link formats a new node access message indicating that a new node is connected to the network management module as described below in step 4h and transmits it to the network management module.

At this time, the node NodeA and the node NodeE have a link activated in a logical link by an operation of an activation module inside each node. On the other hand, each network management module in each NodeA (NodeE) receiving a new node connection message indicating a connection of a new node from the link management module in step 5a is linked to the network connection status table in FIG. 5b in FIG. 5b. Set the number and link status fields.

The operation of setting the link number and the link state field in the network connection state table (FIG. 6) in FIG. 5B is as follows.

When a message indicating that a new link is connected is received from the link management module, the network management module searches for a record corresponding to the link number by data of the LINK field of the new node connection message. For example, if the link number is the i-th link, the i-th record is selected to store the link number in the link number field, and the link status field records the data "normal" (link activation is normal). Each network management module in NodeA (NodeE) that has performed step 5b receives a message asking for the identity of the access node through a link of another node interface 60 activated by formatting as follows. And wait for a response in step 5d.

(Here 'FFh' in the DPC field means null. That means you know that another node is connected via a new link, but you still don't know the identity of the other node).

At this time, the network management module of each node that receives the message transmitted in step 5c in step 5g formats the message indicating its identity in the format of FIG. 7 in step 5h and transmits it through the activated link.

For example, if NodeA receives a message asking for such “congestion” in step 5c while NodeA's network management module transmits the message in step 5c, it receives the node in Node 5 of FIG. In step 5h, the network management module transmits a message indicating its identity (own node number) to the node NodeA by formatting as follows.

[If NodeA and NodeE are connected through Link 3 in a network connection state, and if NodeE sends its own identity message to NodeA, the link number is '03h', The child node number is (NodeE), and the other node number is (NodeA). ]

On the other hand, the transmitting axis [NodeA] network management module which sends a message asking for the connection congestion of the node receives the message containing the node congestion transmitted from the network management module of the other node [NodeE] in step 5e. In step 5f, the node number of the transmission axis recorded in the OPC field in the reception message (I AM) containing the node identity in the node field of the connection node in each network connection status table (Fig. 6) is connected to the connection node. Record it.

Accordingly, it can be seen that the link number, the link state, and the node number of the other party are recorded in the record of the link to which the line is connected among the network connection state records corresponding to the number of links by the above operation.

Therefore, it can be seen that the node connection fact and access node congestion of the dynamically changing switching network can be detected by the protocol communication and reflected in the network operation information.

As described above, it is possible to increase the efficiency of network operation by detecting dynamic state changes and immediately reflecting them on the network structure, and there is an advantage of improving software reliability efficiency and maintainability by hierarchical module configuration.

Claims (1)

Another node having a link connected to the other node, and interfacing the signal and data between the other node and the system by a predetermined control; and from the other node interface 60 when a new node is connected to the link. Nodes composed of an interrupt module, a link management module, a link activation module, a network management module, and a signaling module 70 having a network connection status table corresponding to a link by link generation and network management. A method for processing a connection-configured switched network node connection, wherein an arbitrary node is connected and instructs a link activation module to activate a link upon input by a flag generated by hardware, and waits for a link activation result message to arrive. Successful activation upon arrival of the link activation result message in the first steps 4a, 4b and 4c and in the first steps 4a, 4b and 4c. In the second step (4d, 4e, 4f) and the search in the second step (4d, 4e, 4f) and the successful activation in the second step (4d, 4e, 4f) to retrieve the authorization and transmit the link activation message when the activation is not successful until the link activation module succeeded The third step (4e, 4g, 4h) of making the link status available and outputting a message informing the network management module of the new node connection, and the network connection when the new node's connection message is sent from the link management module. The fourth step (5a, 5b, 5c, 5d) of setting the link and status fields in the status table, sending a congestion inquiry message asking the identity of the new connection node to the newly connected node, and identifying the identity of the node. And a fifth step (5e, 4f) of recording the access node in the node field of the network connection status table when the congestion message is transmitted and received from the newly connected node. The exchange network node connection method.

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