JP3683196B2 - Termination node connection control method in ATM-LAN - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ATM-LAN destination node connection control method that enables multimedia communication using an ATM (Asynchronous Transfer Mode) communication system for a LAN (intra-area network), and more particularly, to a destination side switching node. The present invention relates to an ATM-LAN destination node connection restriction method that recognizes the connection restriction state of an exchange node and reflects the restriction process on the originating exchange node.
[0002]
[Prior art]
Conventionally, an ATM-LAN system adopting an ATM (Asynchronous Transfer Mode) communication system, particularly an ATM-LAN system using an SVC (Switched Virtual Connection) system, restricts connection by ATM address. A technique for performing the above is known from JP-A-11-122251.
[0003]
[Problems to be solved by the invention]
However, when the connection restriction is performed by the ATM address in the conventional node connection restriction of the conventional ATM-LAN system, there are the following problems.
1) The restriction at the destination node is that the originating node does not recognize the restriction state of the destination node, so that invalid traffic occurs due to retry of the connection processing of the exchange node for the call from the ATM terminal, and the exchange within the network Consume node resources unnecessarily.
2) If the originating device is a HUB (LAN concentrator), router, etc., the retry interval is as short as seconds, and infinite retry is possible, which will seriously affect the CPU load on the relay switching node. .
3) Since the LAN administrator is often performed for each department or department, it is difficult to reflect the restrictions on the called side on all the switching nodes in the network.
[0004]
The present invention has been made to solve the above-described conventional problems, and automatically reflects the connection restriction status of the destination switching node in the ATM-LAN system on the source switching node side. It is an object of the present invention to provide an ATM-LAN destination node connection regulation method that eliminates call connection processing and connection regulation registration, and can greatly reduce the load on an exchange node.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a plurality of ATM switching nodes connected to constitute an ATM communication network as a LAN medium, and a plurality of ATM terminals connected to each of these ATM switching nodes. An ATM-LAN destination node connection regulation method for reflecting an incoming call regulation state of a destination side ATM exchange node among the ATM exchange nodes to a source side ATM exchange node, wherein the destination side ATM exchange node uses the destination side ATM exchange node. Incoming call restriction for an arbitrary ATM terminal connected to the switching node is registered, and the called-side ATM is set at the time of initial call setting from the ATM terminal connected to the originating ATM exchange node to the incoming call-restricted ATM terminal. the called party ATM and return the call acceptance rejection message indicating an incoming call regulation contents of the exchange node on the calling side ATM switching node and relay ATM switching node The connection regulations conversion node automatically be reflected in the calling side ATM switching node and relay ATM switching nodes, and characterized in that said connection restriction processing for subsequent call set was to be performed by the calling side ATM switching node To do.
[0006]
In the present invention, the connection restriction of the terminating ATM exchange node is automatically reflected in the originating ATM exchange node, and connection restriction processing is performed at the originating ATM exchange node, so that invalid traffic at the relay exchange node is reduced. The restriction registration only needs to be performed at the destination exchange node, and it is not necessary to reflect the restriction at the destination side on all nodes in the network, and the restriction registration at the originating exchange node is reflected only at the node where the traffic occurred. Therefore, it is not registered in an exchange node that does not generate traffic, and unnecessary call connection processing and connection regulation registration can be omitted.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an ATM-LAN destination node connection restriction method according to the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram showing an example of an ATM-LAN network to which the destination node connection regulation method of the present invention is applied.
In FIG. 1, 10A to 10F are ATM switching nodes constituting an ATM communication network as a LAN medium. An ATM switching node 10C is connected to the line 00 of the ATM switching node 10D, and an ATM switching node 10C is connected to the ATM switching node 10C. Each of the exchange node 10A and the ATM exchange node 10B is connected.
An ATM exchange node 10F is connected to the line 20 of the ATM exchange node 10D, and an ATM exchange node 10E is connected to the ATM exchange node 10F.
[0008]
An ATM terminal AAA having an ATM address of ATMadr = AAA, an ATM terminal AAB having an ATM address of ATMadr = AAB, and an ATM terminal AAC having an ATM address of ATMadr = AAC are connected to the ATM switching node 10A.
An ATM terminal BBA with an ATM address of ATMadr = BBA is connected to the ATM switching node 10B. An ATM terminal DDA with an ATM address of ATMadr = DDA and an ATM terminal DDB with an ATM address of ATMadr = DDB are connected to the ATM switching node 10D. Further, an ATM terminal EEA whose ATM address is ATMadr = EEA is connected to the ATM switching node 10F.
Although an actual ATM address has a 26-digit address prefix, it is displayed in three digits for convenience in this embodiment.
[0009]
The ATM exchange nodes 10A to 10F send a call acceptance rejection message representing the contents of the incoming call restriction to a function of enabling registration of incoming call restriction to an arbitrary ATM terminal connected to the ATM exchange node. The function of reflecting the connection restriction of the destination exchange node to the originating ATM exchange node and relay ATM exchange node by returning to the node and relay ATM exchange node side, and the originating ATM exchange node receiving the call acceptance rejection message Has a function of performing a connection restriction process for calls. In the ATM switching nodes 10A to 10F of the network shown in FIG. 1, the ATM switching nodes 10A, 10B, 10D, and 10E function as an originating or destination ATM switching node, and the ATM switching nodes 10C and 10F function as a relay switching note. To do.
[0010]
Next, the operation of the present embodiment configured as described above will be described with reference to the sequence diagrams shown in FIGS.
A case will be described in which incoming call restriction is performed at the ATM switching node 10D in the network configuration shown in FIG.
In this case, restriction registration is performed in the ATM switching node 10D so as to restrict the call of the incoming address = DDB on the line 00 (see FIG. 2). For a call with the destination address = DDB at the time of restriction, a call acceptance rejection message (Cause) using a disconnection confirmation message (Release Complete Massage, hereinafter abbreviated as RELCOM) which is one of the call control messages. = **) is sent back to the originating ATM switching node and the relay ATM switching node.
In addition, in the ATM exchange nodes other than the ATM exchange node 10D, the connection restriction of the destination ATM exchange node 10D is enabled to be reflected, and the origination ATM exchange node and the relay of the connection restriction of the destination ATM exchange node 10D are enabled. A condition for reflecting to the ATM exchange node is set. That is, the RELCOM Cause to be returned when the destination ATM exchange node 10D performs the connection restriction is designated, and the valid time of the connection restriction automatically reflected is designated. The effective time of this connection restriction is set by a timer (not shown) provided in the terminating ATM exchange node.
[0011]
In this state, from the ATM terminal AAA under the ATM switching node 10A to the ATM terminal DDB under the ATM switching node 10D, the line indicated by the arrow in FIG. Assuming that a call having a destination address = DDB is set as an incoming call, as shown in FIG. 2, the processing for call connection is performed from the ATM terminal AAA to the ATM switching node 10A, ATM switching node 10C, ATM switching node. Step up to 10D sequentially.
Here, since the ATM switching node 10D is in an incoming call restriction state, the ATM switching node 10D sequentially returns a call acceptance rejection message (cause = **) to the ATM switching node 10C, the ATM switching node 10A, and the ATM terminal AAA. And reject the call. When the ATM exchange node 10C and the ATM exchange node 10A receive the call acceptance rejection message (cause = **), the connection restriction of the destination address = DDB is reflected in the ATM exchange node 10C and the ATM exchange node 10A. A method of deriving the called address from the call memory at this time is adopted. Also, the source node A reflects the restriction when receiving RELCOM only when Cause = ** in which the Cause included in RELCOM is specified.
[0012]
As a result, the connection restriction of the terminating ATM exchange node 10D is reflected in the originating ATM exchange node 10A, so that calls destined for the ATM terminal DDB from the ATM terminals AAA, AAB, AAC under the ATM exchange node 10A are restricted. It becomes a target.
Therefore, as shown in FIG. 2, the acceptance of a call addressed to the ATM terminal DDB from the ATM terminal AAA is rejected at the time when the call is stepped up to the ATM switching node 10D, but the connection restriction is applied at the time of a re-call. The connection restriction process is performed at the reflected ATM exchange node 10A. Similarly, in order to accept calls addressed to the ATM terminal DDB from the ATM terminals AAB and AAC, connection restriction processing is performed at the ATM exchange node 10A reflecting the connection restriction as shown in FIG.
[0013]
On the other hand, when a call addressed to the ATM terminal DDB is generated from the ATM terminal BBA under the control of the ATM switching node 10B, the processing for call connection is performed from the ATM terminal BBA to the ATM switching node 10B, as shown in FIG. Step-up is performed sequentially to the ATM exchange node 10C. At this time, since the incoming call restriction state of the ATM exchange node 10D is reflected in the ATM exchange node 10C, a call acceptance rejection message (cause = **) is sequentially returned to the ATM exchange node 10B and the ATM terminal BBA, Reject the reception. When the ATM exchange node 10B receives the call acceptance rejection message (cause = **), the connection restriction of the destination address = DDB is reflected in the ATM exchange node 10B. Thereby, at the time of a recall from the ATM terminal BBA to the ATM terminal DDB, the connection restriction process is performed in the ATM switching node 10B in which the connection restriction is reflected.
[0014]
Further, in FIG. 1, since the ATM switching node 10F is connected to the line 20 of the ATM switching node 10D that is not regulated, calls from the ATM switching node 10E and the ATM switching node 10F are not regulated. .
Therefore, when a call having a destination address = DDB occurs on the line 20 of the ATM switching node 10D from the ATM terminal EEA to the ATM terminal DDB, the process for call connection is performed as shown in FIG. Steps up from EEA to ATM terminal DDB through ATM switching node 10E, ATM switching node 10F, and ATM switching node 10D, establishing a call connection between ATM terminal EEA and ATM terminal DDB, enabling transmission of user data become.
[0015]
Also, the reflected connection restriction valid time is automatically canceled by a timer (not shown) provided in the terminating ATM exchange node 10D.
[0016]
According to the present embodiment, the connection restriction state of the terminating ATM exchange node is automatically reflected on the originating and relay ATM exchange nodes, and restriction processing is performed at the originating ATM exchange node. Occurrence of connection processing retry (recall) at the relay ATM switching node can be suppressed at the originating ATM switching node, thereby reducing the signal processing load on the switching node.
In addition, according to the present embodiment, since the connection restriction of the terminating ATM exchange node is automatically reflected in the originating ATM exchange node, it is conventionally necessary to perform connection restriction registration for the number of nodes per restriction pattern. However, the maintenance work for the operator can be simplified by simply performing it at one place on the terminating ATM exchange node.
In addition, according to the present embodiment, the restriction registration is reflected on the RELCIMP message receiving node, so that it is not necessary to perform the restriction registration at the exchange node where traffic does not occur, and thus the restriction registration can be optimized. become.
[0017]
In the present invention, in addition to the ATM Forum UNI3.0, 3.1, 4.0 and ITU-T Q.2931 used in the AIM-LAN, the ITU-T Q.931 used in the telephone network is used. Is also applicable.
It is also possible to apply the restriction by the combination of the source address / the destination address.
In the above embodiment, the case where the reflected connection restriction effective time is automatically canceled by the timer has been described. However, the present invention is not limited to this, and may be manually canceled by a maintenance person or the like. Good.
[0018]
【The invention's effect】
As described above, according to the present invention, the connection restriction of the terminating ATM exchange node is automatically reflected in the originating ATM exchange node, and the connection restriction processing is performed in the originating ATM exchange node. Invalid traffic is reduced, and it is only necessary to register the restriction on the destination exchange node, and it is not necessary to reflect the restriction on the destination side on all the nodes in the network. It is not registered in an exchange node that does not generate traffic by only the node that has occurred, and unnecessary call connection processing and regulation registration can be omitted.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an example of an ATM-LAN network to which a destination node connection restriction method of the present invention is applied.
FIG. 2 is a signal sequence diagram during connection restriction in the method of the present invention.
FIG. 3 is a signal sequence diagram during connection restriction in the method of the present invention.
FIG. 4 is a signal sequence diagram that is not subject to connection restriction in the method of the present invention.
[Explanation of symbols]
10A to 10F: ATM switching node, AAA, AAB, AAC ... ATM terminal, BBA ... ATM terminal, DDA, DDB ... ATM terminal, EEA ... ATM terminal.

Claims (5)

A plurality of ATM switching nodes connected so as to constitute an ATM communication network as a LAN medium, and a plurality of ATM terminals connected to each of the ATM switching nodes. An ATM-LAN incoming node connection restriction method for reflecting an incoming call restriction state of a node to an originating ATM exchange node,
Registering incoming call restrictions for any ATM terminal connected to the called ATM switching node at the called ATM switching node;
When an initial call is set up from an ATM terminal connected to the originating ATM switching node to the ATM terminal restricted to the incoming call, a call acceptance rejection message indicating the incoming call restriction content of the incoming ATM switching node is sent to the originating ATM. The connection restriction of the destination ATM exchange node is automatically reflected on the originating ATM exchange node or the relay ATM exchange node by returning to the exchange node or the relay ATM exchange node , and the connection restriction processing for the subsequent call setting is It was done at the originating ATM exchange node.
An ATM-LAN destination node connection regulation method characterized by the above.   2. The ATM-LAN destination node connection restriction method according to claim 1, wherein the call acceptance rejection message is a disconnection confirmation message that is one of call control messages.   2. The ATM-LAN destination node connection regulation method according to claim 1, wherein the reflected connection regulation valid time is automatically canceled by a timer at the destination ATM switching node.   2. The ATM-LAN destination node connection regulation method according to claim 1, wherein the reflected connection regulation valid time is manually canceled on the destination ATM switching node side.   2. The ATM-LAN destination node connection restriction method according to claim 1, wherein the incoming call restriction registration is performed by designating an incoming address of an ATM terminal subject to connection restriction.

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