JPH11239142A - Call setup method in nodes and networks - Google Patents

Abstract

(57) [Summary] The present invention relates to a switching service in a switching network, and aims to provide an instant connection service by reducing the accumulated delay time when passing through one or more relay nodes. When a call setting request from a user is received at a node accommodating a user and connected to another node via a previously secured path, and a path setting via the other node is performed, the call setting request is issued. Is transmitted to the other node via the previously secured path.
Further, when a call is set up to a user via a previously reserved path, the acquisition of the channel identifier of the path is performed such that the nodes on both sides of the path acquire channel identifiers that can be used with different logics from each other. Set up capture logic. Further, when selecting a previously secured path, a configuration is adopted in which the path having a small bandwidth usage rate or a large usable bandwidth is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call setting system in a node and a network. In recent years, PC (Per
With the spread of sonal computers and the development of multimedia technology, the number of users who transfer large amounts of data such as voice, still images, and moving images has increased in the field of communication services.
Providing faster communication services is desired. Also,
Some operators have provided public ATM switching services as high-speed communication services. In the future, as the number of ATM switching service users increases, the ATM switching network will expand,
It is considered that the number of installed ATM switches will also increase.
The increase in the number of ATM exchanges causes a processing delay at a relay node in the ATM exchange network, and it is expected that the time required for connection in call setup will increase. In the high-speed communication service, a delay in the connection time results in a decrease in the transfer rate per unit time from the start of the connection to the end of the transfer.

[0002]

2. Description of the Related Art SVC (Switched Virtual Channel)
l) The call setting is originated by the calling user and reaches the called user via the calling node, the relay node, and the called node of the ATM switching network. In this relay node, connection time is delayed in proportion to the number of relay nodes due to relay processing such as signal reception, analysis, routing processing, and VC (Virtual Channel) capture. In addition, a delay in connection time may be affected by congestion or a failure at a relay node from a source node to a destination node, which may result in a call loss.

[0003]

As described above, in the conventional SVC call setting processing, the connection processing time increases in proportion to the number of relay nodes in the ATM switching network, and the call congestion at the relay nodes, etc. This causes a problem of call loss and delay. The present invention relates to a path (PVP: Permanent Virtua) previously secured between a source node and a destination node in a switching network.
l Path) is set before the start of the call setup service, and the call setup accepted by the source node is set up directly from the source node to the destination node without performing the relay process at the relay node. And to provide an instant connection service.

[0004]

In order to achieve the above object, a call setting method according to the present invention (a method of transmitting a dial number of a partner terminal when performing communication and communicating only with a partner who has set a communication channel). )), A path (PVP: Permanent Vi) previously secured between nodes of a network (ATM switching network) before the connection service starts.
rtual Path) is set.

[0005] A path (PVP) that accommodates a user (calling user) and is secured in advance with another node (destination node switching means)
In the node connected by the above, when a call setting request from the user is received and a path setting via the other node is performed, the call setting request is transmitted to the other node via the previously secured path. I do. Also, a user (called user) who receives a call setting request from another node (source node switching means, relay node switching means) via a path secured in advance and whose destination is accommodated in its own node (destination node switching means).
In the case of, a call setting process for the user is performed.

Furthermore, a plurality of other nodes (source node exchange means, destination node exchange means) and a path (PV
In the node connected in P), the relay node receives a call setting request from the first other node (source node switching means) via a previously secured path, and the destination is the second other node. In the case of a user (terminating user) accommodated in a node (terminating node switching means), the relay node serves as a means for transmitting a call setting request via a path previously established with the second other node. It is configured as a relay node exchange means.

In a network in which a previously secured path (PVP) is set between a first node (source node switching means) and a second node (destination node switching means) each accommodating a user. When a node (calling user) receives a call setting request from a user (originating user) to a called user accommodated in the second node, the path secured in advance between the first node and the second node And sends a call setup request to the second node via the terminal. The second node receives the call setup request and performs a call setup process on the called user.

[0008] Between a first node (source node exchange means) accommodating a user (originating user) and a second node (relay node exchange means), and a third node accommodating the second node and the user. In a network in which a path (PVP) secured in advance between a node (destination node switching means) and a node (destination node exchange means), a user (a destination user) of the first node to a user (a destination user) of the third node ) Is received by the first node, and the call setting request is sent to the second node via the path previously established between the first node and the second node. , The second node receives the call setup request, and the second node and the third
Via a previously secured path between the third node
, The third node receives the call setting, and if the destination is a user accommodated in the third node, performs call setting processing for the called user.

[0009] Further, as the previously secured path, a path having a low band usage rate or a path having a large usable band is selected. Also, the channel identifier is captured (by the VC resource capturing means) according to a preset capture logic.
The acquisition logic needs to be set so as to preferentially acquire even or odd channel identifiers, or preferentially acquire in ascending or descending order.

By providing the above method, the above-mentioned problem is solved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining an embodiment (1) of the present invention, and FIG. 2 is a diagram for explaining a basic signal sequence in the embodiment (1) of the present invention. FIG. 5 is a diagram for explaining the format of the routing management table 25 shown in FIG. 1, and FIG. 6 is a diagram for explaining the routing confirmation table 47 shown in FIG. FIG. 7 is a view for explaining the format of the VC management tables 24 and 44 shown in FIG.

In the embodiment of the present invention, before starting the SVC switching service in the ATM switching network 60, the operation via the source node 20 and the relay node 30 is performed by an operation or a manual operation from a maintenance workstation (not shown). It is necessary to set the PVP 27 with the destination node 40. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0013] The source node exchange means described in the above [Means for Solving the Problems] is characterized in that:
C call accepting means 21, SVC relay connecting means 22, VC resource capturing and managing means 23a, routing managing means 2
6, composed of the routing management table 25. Also,
The VC resource capturing / managing means comprises a VC resource managing means 23 and a VC management table 24 as a VC resource capturing / managing means 23a.
3a comprises a VC resource management means 43 and a VC management table 44, and the destination node exchange means comprises an SVC relay connection means 42, a VC resource acquisition management means 43a, and a routing confirmation means 4 as destination node exchange means 40a.
8, a routing confirmation table 47 and an SVC incoming call control means 49.

The call setting request transmitted from the calling user 10 to the called user 50 corresponds to the SETUP 101 shown in FIG.
The SVC call accepting means 21 requests the SVC relay connecting means 22 to perform a relay connection process of the call setting request. The SVC relay connection means 2
2 requests the routing management means 26 to select a PVP reaching the destination node 40 in which the destination user 50 is accommodated. The routing management means 26 searches the routing management table shown in FIG. 5 using the upper N digits of the telephone number of the called user 50 as a key. For example, a telephone number with 10 digits
If abc-def-ghij is used and the upper N digits are 3, the key becomes abc which is the first three digits of the telephone number. The routing management means 26 stores the routing management table 25
abc-th remote node number, first PVP identifier,
..., read out the n-th PVP identifier. The routing management means 26 uses the read first PVP identifier. However, if the first PVP identifier cannot be used due to a failure or congestion, the second PVP identifier set between the source node 20 and the destination node 40 is selected as an alternative PVP identifier. The second
If the PVP identifier cannot be selected due to a failure or congestion, a process of selecting a PVP usable up to the n-th PVP identifier is performed, and the selected PVP is notified to the SVC relay connection unit 22. The SVC relay connection unit 22 requests the VC resource management unit 23 to acquire a usable VC identifier based on the PVP identifier selected by the routing management unit 26. The VC resource management means 23
Is the VC management table 2 using the PVP identifier as a key.
4 (refer to FIG. 7 for the detailed table format), capture the available VC identifiers from the free / busy table, update the VC management table 24 for the declared maximum bandwidth and used bandwidth, and capture The VC identifier
C relay connection means 22 is notified. The SVC relay connection means 22 uses the VC identifier to the IAM 111 (In) shown in FIG.
The SVC call accepting means 21 transmits the CALL PROC 12 to the calling user 10.
Send 1

The SVC relay connection means 42 is connected to the IAM 11
1 is received, the routing confirmation means 48 searches the routing confirmation table 47 (refer to FIG. 6 for a detailed table format) using the PVP identifier as a key, and sends the remote node number obtained to the SVC relay connection means 42 to the SVC relay connection means 42. Notice. The SVC relay connection unit 42 confirms the consistency between the notified remote node number and the remote node number included in the IAM 111. The SVC relay connection unit 42 requests the VC resource management unit 43 to capture the VC identifier if the consistency check is performed and the remote node numbers match. The VC resource management unit 43 searches the free / busy table of the VC management table 44 (see FIG. 7 for the detailed table format) using the PVP identifier as a key, captures a usable VC identifier, and sets a maximum bandwidth. And updates the VC management table 44 for the used band and notifies the SVC relay connection unit 42 of the VC identifier. When the capture of the VC identifier is completed, the SVC relay connection means 42 sends the IAA1 to the SVC relay connection means 22 as an address confirmation message.
31 (IAM acknowledgement message) is transmitted. The S
The VC relay connection means 42 requests the SVC call control means 49 for a call setting request to the called user 50. The SV
C. The incoming call control means 49 confirms the state of the incoming user 50, and if there is no problem, a call setting request as shown in FIG.
The TUP 102 is transmitted.

The SVC relay connection means 42 sends an ACM 141 (Address) as an address completion signal indicating that information necessary for receiving the call to the called user 50 has been received.
s complete message) to the SVC relay connection means 22. Upon receiving the SETUP 102, the called user 50 sends a CONN 151 (Connect)
The call is transmitted to the VC incoming call control means 49. When the SVC incoming call control means 49 receives the CONN 151, the SVC relay connection means 42 sends an ANM 171 (Answe
r message) to the SVC relay connection means 22, and sends a CONN ACK 161 as a response confirmation to the destination user 50.
Send to The SVC relay connection means 22 is connected to the ANM 17
When the SVC 1 is received, the SVC call receiving means 21 transmits CONN 152 (Connect) to the calling user 10 as a response. Upon receiving the CONN 152, the calling user 10 receives a CONN ACK 162 (Connect acknowledgment) as a response confirmation.
Nowledge) is transmitted to the SVC call accepting means 21, and a communication state is established between the calling user 10 and the called user 50 via the ATM switching network 60.

When the communication is completed, the calling side or the called side transmits REL (Release) as release. In FIG.
An example of release from the calling user 10 is shown. When the SVC call receiving unit 21 receives the RELEASE 181 from the calling user 10, the SVC relay connection unit 22 sends a REL 191 to the destination node 40. The destination node 40 sends the RELEASE 182 to the destination user 5
Send to 0. The wearing user 50 is the RELEASE 18
2 is received, the response is RELCOM 211 (Relea
(se completion) to the SVC incoming call control means 49. The SVC call control means 49 sends RLC as a release response.
201 (Release completion message) is transmitted to the SVC relay connection means 22. The SVC relay connection means 22
When the RLC 201 receives the RLC 201, it requests the VC resource management unit 23 to release the currently used VC. The VC resource management means 23 searches the VC management table 24 to release the VC, and updates the maximum bandwidth and the used bandwidth of the PVP relating to the VC. And the SV
By transmitting the RELCOM 212 to the calling user 10, the C relay connection unit 22 completes the connection release processing.

FIG. 3 is a diagram for explaining the embodiment (2) of the present invention, and FIG. 4 is a diagram for explaining a basic signal sequence in the embodiment (2) of the present invention. FIG. 5 is a diagram for explaining the format of the routing management tables 25 and 35 shown in FIG. 1, and FIG. 6 is a diagram for explaining the routing confirmation tables 37 and 47 shown in FIG. FIG. 7 shows the VC shown in FIG.
FIG. 4 is a diagram illustrating the format of management tables 24, 34, and 44.

In the embodiment of the present invention, before starting the SVC switching service in the ATM switching network 60, the operation between the source node 20 and the relay node 30 is performed by an operation or a manual operation from a maintenance workstation (not shown) or the like. And a PVP 28 between the relay node 30 and the destination node 40, respectively.
39 must be set. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The calling node switching means described in the means for solving the problems includes an SVC call receiving means 21, an SVC relay connection means 22, and a V
It comprises C resource acquisition management means 23a, routing management means 26, and routing management table 25. Further, the relay node switching means includes a relay node switching means 3
0a is constituted by the SVC relay connection means 32, the VC resource acquisition management means 33a, the VC management table 34, the routing management means 36, the routing management table 35, the routing confirmation means 38, and the routing confirmation table 37, Destination node exchange means 4
0a is constituted by the SVC relay connection means 42, the VC resource acquisition management means 43a, the routing confirmation means 48, the routing confirmation table 47, and the SVC incoming call control means 49. The VC resource acquisition management means is a VC resource acquisition management means 23a. VC resource management means 23, V
A VC resource management means 33a, a VC resource management means 33, and a VC resource management means 43a.
VC resource management means 43, VC management table 4
4.

The call setting request transmitted from the calling user 10 to the called user 50 is transmitted to the SETUP 101 shown in FIG.
The SVC call accepting means 21 requests the SVC relay connecting means 22 to perform a relay connection process of the call setting request. The SVC relay connection means 2
2 requests the routing management means 26 to select the PVP 28 set in the relay node 30 from the source node. The routing management means 26 searches the routing management table shown in FIG. 5 using the upper N digits of the telephone number of the called user 50 as a key. For example, if the telephone number is 10-digit abc-def-ghij and the upper N digits are 3, the key is abc which is the first 3 digits of the telephone number. The routing management means 26 stores the routing management table 25
abc-th remote node number, first PVP identifier,
..., read out the n-th PVP identifier. The routing management means 26 uses the read first PVP identifier. However, if the first PVP identifier cannot be used due to a failure, congestion, or the like, the second PVP identifier or later is selected as an alternative PVP. The alternative PVP selects a PVP set between the source node 20 and a relay node (not shown) other than the relay node 30. If the second PVP identifier cannot be used due to a failure or congestion, a process of selecting a PVP that can be used up to the n-th PVP identifier is performed. The SVC relay connection means 22 instructs the VC resource management means 23 on the basis of the PVP identifier selected by the routing
Request capture of an identifier. The VC resource management means 23
Is the VC management table 24 based on the PVP identifier.
(Refer to FIG. 7 for details of the table format.) Searches the free / busy table of the VC identifier, captures the usable VC identifier, updates the VC management table 24 for the maximum band and the used band, and The identifier is notified to the SVC relay connection means 22. The SVC relay connection means 22 uses the VC identifier to send an IAM 112 (Initial address message) shown in FIG. 2 to the SVC relay connection means 32.
Is transmitted, and the SVC call receiving means 21 transmits the CALLPROC 121 to the calling user 10.

The SVC relay connection means 32 is connected to the IAM 11
2 is received and the remote node number obtained by searching the routing confirmation table 37 (see FIG. 5 for the detailed table format) using the PVP identifier as a key is sent to the SVC relay connection means 32. Notice. The SVC relay connection means 32 confirms that the notified remote node number and the remote node number included in the IAM 112 match,
This prevents an erroneous call setting request to the destination node 40. If the remote node numbers match in the consistency check, the SVC relay connection means 32 sends an IAA 132 (IA
M acknowledgement message).

The SVC relay connection means 32 requests the routing management means 36 to select a PVP 39 reaching the destination node 40 in which the destination user 50 is accommodated. The routing management means 36 searches the routing management table shown in FIG. 5 using the upper N digits of the telephone number of the called user 50 as a key. For example, change the telephone number to 10-digit abc-def-ghij
If the upper N digits are 3, the key is abc which is the first three digits of the telephone number. The routing management means 36 determines the abc-th remote node number in the routing management table 35, the first PVP identifier,.
Is read out. The routing management means 3
6 is used from the read first PVP identifier. However, when the first PVP identifier cannot be used due to a failure or congestion, a second PVP identifier set between the relay node 30 and the destination node 40 is selected as an alternative PVP identifier. If the second PVP identifier cannot be selected, a process of selecting a PVP usable up to the n-th PVP identifier is performed, and the selected PVP is notified to the SVC relay connection unit 32.

The SVC relay connection means 32 provides the VC resource management means 33 with the routing management means 36
Requests acquisition of a VC identifier based on the selected PVP identifier. The VC resource management means 33 searches the VC management table 34 (see FIG. 7 for details of the table format) for a VC identifier free / busy table based on the PVP identifier, and captures a usable VC identifier. The maximum bandwidth and the used bandwidth in the VC management table 24 are updated, and the VC identifier is notified to the SVC relay connection unit 32. The SVC relay connection means 32 transmits an IAM 113 (Initial address message) shown in FIG. 2 to the SVC relay connection means 42 of the destination node using the VC identifier.

The SVC relay connection means 42 is connected to the IAM 11
3, the remote node number obtained by searching the routing confirmation table 47 (refer to FIG. 5 for the detailed table format) using the PVP identifier as a key is sent to the routing confirmation means 48 to the SVC relay connection means 42. Notice. The SVC relay connection means 42 confirms the consistency between the notified remote node number and the remote node number included in the IAM 113, and sends a request for an erroneous call setting request to the called user 50. To prevent. If the remote node numbers match in the consistency check, the VC resource management unit 43 is requested to capture the VC identifier. The VC resource management means 43 searches the VC management table 44 (see FIG. 7 for details of the table format) for a free / busy table of VC identifiers based on the PVP identifiers, captures usable VC identifiers, and Updating the maximum bandwidth and the used bandwidth in the management table 44,
The VC identifier is notified to the SVC relay connection means 42.
The SVC relay connection means 42 sends an IAA 133 (IAM) to the relay node 30 as an address confirmation message.
acknowledgment message). The SVC relay connection means 42 requests the SVC call control means 49 to call the called user 50. The SVC incoming call control means 49 confirms the state of the called user 50, and if there is no problem, transmits SETUP 102 shown in FIG. 2 as a call setting request. Also, the SVC relay connection means 42 sends an ACM 142 (Address code) as an address completion signal indicating that information necessary for receiving a call to the called user 50 has been received.
mplete message) to the relay node 30. Upon receiving the ACM 142, the SVC relay connection unit 32 transmits the ACM 142 to the source node 20 as the ACM 143.

When receiving the SETUP 102, the destination user 50 sends CONN 151 (Connect) to the destination node 40 as a response. The SVC incoming call control means 49
When ONN 151 is received, CONN A is used as a response confirmation.
CK 161 is transmitted to the called user 50, and ANM 172 (Answer message) is transmitted to the relay node 30 as a response message. The relay node 30 is connected to the ANM 17
2 receives the ANM 172 from the source node.
173 is transmitted. Upon receiving the ANM 173, the calling node 20 transmits CONN 152 (Connect) to the calling user 10 as a response. The calling user 10 receives the CO
When NN 152 is received, CONN AC is used as a response confirmation.
K162 (Connect acknowledge) is transmitted to the source node 20, and a communication state is established between the source user 10 and the destination user 50 via the ATM network 60. When the communication is completed, the calling or called party releases the REL (Release)
Send FIG. 4 shows an example of release from the calling user 10. RELEA from the calling user 10
When the source node 20 receives the SE 181, the source node 20 transmits a REL 192 to the relay node 30. The relay node 30 stores the REL 193 in the destination node 4
Send to 0. The destination node 40 is the RELEASE 18
2 is transmitted to the destination user 50. The wearing user 50 is
Upon receiving ELEASE182, RELC is returned as a response.
OM 211 (Release completion) is transmitted to the destination node 40, and the destination node 40
(Release completion message) to the relay node 30
Send to The SVC relay connection means 22 provides the VC resource management means 33 with the relay node 30 and the destination node 4.
A request is made to release the VC being used between 0 and 0. The VC
The resource management means 33 searches the VC management table 34 to release the VC, and updates the maximum bandwidth and the used bandwidth. The SVC relay connection means 32 transmits an RLC 203 to the source node 20. The source node 20 is the RL
Upon receiving C203, the SVC relay connection unit 22 requests the VC resource management unit 23 to release the VC currently used. The VC resource management means 23 searches the VC management table 24 to release the VC, and updates the maximum bandwidth and the used bandwidth. Then, the SVC relay connection means 22 sends the RELCOM 212 to the calling user 1
By transmitting to 0, the release processing of the connection is completed.

In the above-described embodiment (2) of the present invention, the type is set in advance in the VC management tables 24, 34 and 44 as VC identifier capture logic. For example,
The types include ascending order, descending order, even number, odd number, and the like. For example, the source node 20 captures VC identifiers in even numbers and in ascending order, and the relay node 30 captures VC identifiers in odd numbers and in descending order, thereby reducing the timing of capturing the same VC identifier. . In capturing the VC identifier of the source node 20 (or the relay node 30), if all the even (or odd) VC identifiers are in use, the odd (or even) VC identifier is captured.

In this case, the VC management tables 24, 34,
As values for setting the VC capture logic at 44, it is assumed that the ascending order is 8, the descending order is 4, the even number is 2, and the odd number is 1. In the VC management tables 24 and 44, 8 + 2 = 10 is set when VC identifiers are to be captured in even numbers and in ascending order.
When capturing VC identifiers in odd numbers and in descending order, 4 + 1 = 5 is set in the C management table 34. The VC
The resource management means 23, 33, 43
The VC identifier is captured according to the capture logic implied by 0 or 5.

In the above embodiment (2) of the present invention, when a PVP is selected by the source node 20 and the relay node 30, a PVP having a larger usable bandwidth among the first PVP to the nth PVP is selected. Alternatively, a PVP with a low bandwidth resource usage rate is selected. That is, the routing management means 26, 36, 46 reads the first to n-th PVP identifiers from the routing management tables 25, 35, 45. Next, the maximum bandwidth and the bandwidth in use of the VC management tables 24, 34, and 44 are read based on the first to n-th PVP identifiers, and the available bandwidth and the bandwidth usage rate are obtained. Then, from among them, PVP with a large usable bandwidth
Alternatively, a PVP with a low band usage rate is selected. Said S
The VC relay connection means 22, 32, 42 selects the selected PVP.
On the basis of the VC identifier, and transmits an IAM signal.

[0030]

According to the SVC call setting service, the cumulative delay time due to the number of relay nodes in the ATM switching network is reduced by passing through the PVP set between the originating node and the destination node, and the SVC call setting service is established. Connection time can be made nearly uniform. In other words, relay processing (reception and analysis of messages, routing processing,
VP and VC capture, message transmission) can be omitted, so that the load on the relay node is reduced.
The processing time at the relay node can be reduced.
Further, it is possible to reduce call loss due to call congestion at the relay node. In addition, in data transfer, etc., in the processing from connection start, transfer start, transfer end, and release end, the time required for connection and release processing can be reduced, and the transfer rate per unit time from the connection start to release end can be reduced. We can expect improvement.

In addition, the use of a public network may be considered as a protection line for a dedicated line due to a reduction in connection time. However, in the related art, since several seconds are required for the connection time, it is necessary to temporarily store communication data in the connection time in a memory or the like, and the technical / cost barrier is high. It is considered that the present invention also has the effect of lowering the technical / cost barrier to utilizing the backup line using the public line network.

[Brief description of the drawings]

FIG. 1 illustrates an embodiment (1) of the present invention.

FIG. 2 is a view for explaining a basic signal sequence in the embodiment (1) of the present invention.

FIG. 3 illustrates an embodiment (2) of the present invention.

FIG. 4 is a view for explaining a basic signal sequence in the embodiment (2) of the present invention.

FIG. 5 is a diagram illustrating a routing management table.

FIG. 6 is a diagram illustrating a routing confirmation table.

FIG. 7 illustrates a VC management table.

[Explanation of symbols]

 Reference Signs List 10 calling user 20 calling node 20a calling node switching means 21 SVC call receiving means 22 SVC relay connection means 23 VC resource management means 23a VC resource capture management means 24 VC management table 25 routing management table 26 routing management means 27, 28 PVP 30 Relay node 30a Relay node switching means 32 SVC relay connection means 33 VC resource management means 33a VC resource capture management means 34 VC management table 35 Routing management table 36 Routing management means 37 Routing confirmation table 38 Routing confirmation means 39 PVP 40 Termination node 40a Arrival Node switching means 42 SVC relay connection means 43 VC resource management means 43a VC resource acquisition management means 44 VC management table 47 Routing confirmation Table 48 Routing confirmation means 49 SVC incoming call control means 50 Called user 60 ATM switching network 101,102 SETUP 111,112,113 IAM 121 CALL PROC 131,132,133 IAA 141,142,143 ACM 151,152 CONN 161,162 CONN ACK 171,172,173 ANM 181,182 RELEASE 191,192,193 REL 201,202,203 RLC 211,212 RELCOM

Claims (9)

[Claims] 1. A call setup method in a node accommodating a user and connected to another node by a previously secured path, wherein a call setup request from the user is received and a path setup via the other node is performed. In the case, the call setting request in the node is transmitted to the other node via the path secured in advance. 2. A call setup method in a node accommodating a user and connected to another node by a path secured in advance, receiving a call setup request from the other node via the path secured in advance, If the destination is a user accommodated in the own node, a call setting process for the node is performed for the user. 3. A call setup method in a node connected to a plurality of other nodes via a previously secured path, wherein a call setup request from a first other node is received via a previously secured path. Transmitting a call setting request via a path previously established between the user and the second other node when the destination is a user accommodated in the second other node. Call setup method. 4. A call setup method in a network in which a previously established path is set between a first node and a second node each accommodating a user, wherein the first node is configured by a user to receive the second When a call setting request to a called user accommodated by the node is received, the node issues a call setting request to the second node via the path previously secured between the first node and the second node. Transmitting, the second node receiving the call setup request, and performing a call setup process on the called user. 5. A first node for accommodating a user, and a second node for accommodating a user.
Between the second node and the third node accommodating the user, in a call setting method in a network in which a path secured in advance is set between the second node and the third node. The first node receives a call setup request for a user accommodated by the third node, and the second node receives the call setup request via the path previously established between the first node and the second node. Transmits a call setup request to the second node, the second node receives the call setup request, and receives the call setup request via the path previously established between the second node and the third node. The third node transmits the call setting to the third node, the third node receives the call setting, and when the destination is a user accommodated in the third node, performs a call setting process for the called user. A call setup method in a network. 6. The call in a node and a network according to claim 1, wherein the path reserved in advance selects a path having a small bandwidth usage rate or a large available bandwidth. Setting method. 7. The call setting method in a node and a network according to claim 1, wherein a channel identifier in the path secured in advance is acquired according to an acquisition logic set in advance. 8. The call setup method according to claim 7, wherein said acquisition logic preferentially acquires even or odd channel identifiers. 9. The method according to claim 7, wherein the acquisition logic preferentially acquires the channel identifiers in ascending or descending order.