JPH05268252A - Connection connecting system in communication network - Google Patents

Abstract

PURPOSE:To obtain technology which can separate a call setting from a connection connecting and can connect a connection in accordance with various situations concerning a communication control system performing a call setting and a connection setting separately from each other in an ATM network. CONSTITUTION:A direct pass D-PASS is previously set between all the nodes. A call connection uses the direct pass D-PASS and connection connecting uses a route different from the direct pass D-PASS. Thus, the various kinds of services of B-ISDN can concretely be realized. One of the examples of those is that a transmission node 7 can set a connection pass C-PASS which reaches an incoming node 8 by way of a data conversion node 21 separately from the direct pass in the case of detecting the mismatching of layers between a transmission terminal 6 and an incoming terminal 13 at the time of connecting the call.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control system for separating call setting and connection setting in an ATM network.

[0002]

2. Description of the Related Art B-ISDN is a next-generation communication technology.
(Broad-band Integreated Service Digital Network) is under study, and ATM (Asynchronous Transfer Mode) is used as a communication exchange technology for realizing this B-ISDN.
Exchange technology is being considered. With this ATM exchange technology,
This is a technology to transfer data such as voice or image in fixed length packets called cells, and the conventional STM (Synchrono) that allocates a fixed band according to the amount of information.
It is expected to be a technology that enables the transfer processing of enormous amounts of data such as image information that is difficult to handle with the us Transfer Mode) method.

[0003]

However, the above-mentioned A
Also in the TM switching technology, call setup is performed by an existing method, that is, by sequentially linking a destination node (destination switching center) and a destination node (destination switching center) from a source node (source switching center) through a plurality of relay nodes (relay switching center). Then, a method of establishing a call and a connection by so-called link-by-link is considered.
Therefore, the communication speed after the connection is established is sufficiently high, but there is a problem that it takes a lot of processing time to establish the connection.

In addition, in the ATM network, since a large amount of information, so-called burst information, is instantaneously handled, it is necessary to appropriately select a path (a path with a large used bandwidth) that can minimize cell discard depending on the information content. It is expected that it will be necessary to select a route with a connection setting different from the call setting.

The present invention has been made in view of the above problems, and an object thereof is to provide a technique capable of separating call setting from connection connection and performing connection connection according to various situations. Especially.

[0006]

According to the present invention, a direct path (D-PASS) is set in advance between all nodes,
Call connection is performed using this direct path (D-PASS). As a result, first direct path (D-PASS)
When a call connection is established through the connection, and when a layer mismatch between the calling terminal (6) and the called terminal (13) is detected at this time, the calling node (7) calls the data conversion node (21). The connection path (C-PASS) to the destination node (8) via the connection path is set separately from the direct path.

[0007]

According to the present invention, as shown in FIG. 1, which is a principle diagram, the originating node 7 does not connect the originating terminal 6 and the terminating terminal 13 by a call connection made through, for example, a direct path (D-PASS). When a match is detected, the connection connection request sent from the source node 7 can be guided to arrive at the destination node 8 via the data conversion node 21, thus efficiently connecting various terminals. can do.

[0008] In this way, the call setting and the connection connection are separated from each other by processing, and each independent path is secured, so that such data conversion is started, the addition / change of the band, and the independent upper and lower paths are performed. , Teleconferencing system, etc. B-
Various services planned by ISDN can be concretely realized.

[0009]

(Embodiment 1) In the present embodiment 1, first, a direct path (D-PASS) setting method and the like (FIGS. 4 to 6) for separating call setting and connection connection are described, and then, An example using this method will be described with reference to FIGS.

2 and 3 show a cell 1 in ATM.
1 shows the format of FIG. 1, and FIG.
3 shows a header portion of the cell 11 in the source node 7, and FIG. 3 shows a header portion of the cell 11 between the nodes.

The header 9 includes 4-bit flow control information (GFC: Generic Flow Control), 8-bit path information (VPI), and 12-bit channel information (VC).
I) and 3-bit cell format information (PT: Payload Typ)
e) and cell loss priority information (CLP: Cell Loss Priorit)
y), and 8-bit header control information (HEC: Heade
rError Control) and.

The latter includes flow control information (GFC).
The path information (VPI) is assigned instead of. Both of them have an information field 12 following the header.

In the cell 11, the path information (VPI) as the route information and the channel information (VCI) are sequentially rewritten for each node and transmitted, and finally reach the destination terminal 13 from the destination node 8.

FIG. 4 is a diagram conceptually showing separation control between call setting and connection setting. As shown in the figure, a plurality of nodes 1 are provided between the calling terminal 6 and the called terminal 13.
0 ,, exist, and the connection connection request is achieved by link-by-link for each node, but the call connection request is realized by the direct path from the source node 7 to the destination node 8. Here, the “direct path” actually passes through each node 10 ,,, even in the case of a call connection request, but each node 10 ,,, does not perform any connection procedure such as bandwidth reservation. , Which means that a route for mechanically sending out the cell 11 of the call connection request to the next node 10 is set.

FIG. 5 is an overall view showing the network configuration of this embodiment. In the figure, a unique node number is given to each node, and these are collectively managed by the maintenance center 5.

FIG. 6 is a block diagram showing the configuration of the maintenance center 5 and the nodes. In the figure, the maintenance center 5 has a network configuration database 4 and a node management device 14.

The network configuration database 4 has a registration area for each node, and the destination node 8 and the corresponding outgoing route number are registered as a pair in this registration area. In FIG. 6, for example, in the node # 1, when the call connection request cell 11 whose destination node 8 is # 2 arrives, the cell 11 is instructed to output from the outgoing route "A". Is becoming

Each node is provided with a switching control device 2, a route information table 1 and a switch device 3.
The switching control device 2 has a function of controlling the rewriting of the route information table 1, and the cell 11 that arrives at the node concerned.
The header information is rewritten according to the contents of the route information table 1 to pass through the switch device 3.

The path information table 1 contains the path information (input VPI) and channel information (input VC) of the input cell 11.
I) is used as an index, and the physical outgoing line of the node, the path information (outgoing VPI) and the channel information (outgoing VCI) of the output cell 11 are respectively registered.

Although the route information table 1 is divided into a direct connection table 15 and a general user table 16, only the direct connection table 15 is used in this embodiment.

Here, regarding the route information for call connection used in this embodiment, the node number of the destination node 8 is registered as it is as channel information (VCI). In the figure, when the outgoing line is indicated by “¥”, the cell 11 itself is taken in as the destination node 8. Therefore, the cell 11 whose incoming VCI is shown as "00001" in the figure indicates that the cell (# 1) itself should take in the cell 11.

"*" Means don't care, that is, the corresponding information in the cell 11 is ignored.
In the figure, the cell 11 whose incoming VCI is "00002"
Indicates that the outgoing line is "0" regardless of the values of incoming VPI and outgoing VPI.
000A ", and the input VCI is output as it is as the output VCI.

As described above, the channel information (VCI) for direct connection can determine the outgoing line only by the channel information (VCI) regardless of the value of the path information (VPI). Moreover, since this channel information (VCI) is a unique value indicating each node in the entire network,
In each node, when the cell 11 having the same channel information (VCI) as its own node number arrives, the node becomes the destination node 8 and therefore the cell 11 is fetched. Also, channel information (V
When the cell 11 having the CI) arrives, the channel information (VCI) is directly rewritten to the node of the next stage determined by the route information table 1 without rewriting.
Send 1.

In this embodiment, the contents of the network configuration database 4 of the maintenance center 5 are notified to the exchange control unit 2 of each node through the node management unit 14 in order to set the direct path between all the nodes.

Upon receipt of the notification, the switching control device 2 of each node converts the node number into an input VCI and an output VCI, further converts the output route number into a physical output line number, and routes them. It is registered in the direct connection table 15 of the information table 1.

As described above, by writing the route information collectively managed by the network configuration database 4 in the route information table 1 of each node, a direct path is realized between all the nodes and from any of the originating nodes 7. It is conceptually possible to directly make a call connection request to any destination node 8.

FIG. 4 shows an example in which a direct path is set between the Kawasaki station which is the source node 7 and the Aizu station which is the destination node 8. However, since this direct path does not consider bandwidth etc. at all, it can be used only for call setup and communication of a small band, but as far as call setup is concerned, it is extremely fast and efficient compared to the conventional technology. Is possible.

Further, regarding connection connection, linking is performed while securing bandwidth between each node as in the prior art.
It is done by a bi-link system. Therefore, in the case of a connection connection request, the route information table 1 is rewritten for each node while a band is secured with the next-stage node, and a link-by-link connection is performed.

In FIG. 4, connection connection is realized while establishing links in the order of Kawasaki station → Tokyo station → Fukushima station → Aizu station. As described above, in this embodiment, the call setup procedure and the connection connection procedure are separated, and the call setup procedure is performed through the direct path set between all the nodes.
The call setup process can be performed at high speed.

Next, different from the above, a case where each node autonomously sets a direct path to another node will be described with reference to FIG. This is a direct path setting method using a general call setting procedure in the prior art.

Each node has an exchange control device 2, and in this exchange control device 2, all node numbers and a signal transmission destination (outgoing route) to the next node 10 corresponding thereto are registered. It has a logical node database 17. Also,
In addition to this, it has a call connection analysis table 18 and a connection connection analysis table 20 as shown in FIG. 8, which will be described later.

The structure of the route information table 1 is the same as in the first embodiment.
And is composed of a direct connection table 15 and a general user table 16. Further, the switch device 3 has the same configuration.

A procedure for setting a direct path between nodes will be described with reference to FIG. First, originating node 7
(# 1) stores the partner node number in the IAM signal which is the direct path setting request and transmits it to all the nodes.

The next node 10 (# 2) compares the node number stored in the IAM signal, which is the signal of the direct path setting request, with the node number given to itself, and if they match, the node itself is It becomes the destination node 8, determines the VPI and VCI with the preceding node (# 1), stores this in the ACM signal which is a direct path setting completion notification, and returns it to the originating node 7 (# 1). The originating node 7 (# 1) rewrites its own routing information table 1 (# 1) based on the VPI and VCI stored in the ACM signal.

On the other hand, in the next node 10 (# 2), when the direct path setting request signal (IAM signal) received from the source node 7 (# 1) is not for itself (does not match its own node number), Previous node 7 (#
The VPI and VCI with 1) are supplemented, and the direct path setting request signal (IAM signal) is retransmitted to the node 8 (# 3) at the next stage.

If the next-stage node 8 (# 3) is the destination node 8, the VPI and the VPI stored in the direct path setting completion notification (ACM signal) received from the destination node 8 (# 3) VCI out VPI and out VCI
, The VPI and VCI with the preceding node 10 (# 1) are registered in the incoming VPI and incoming VCI, and the route information table 1
To complete the rewriting.

Further, the relay node 10 (# 2) sends a direct path setting completion notification (ACM signal) to the upstream node 7 (# 1) using the VPI and VCI between the upstream nodes as parameters. The node 7 (# 1) at the preceding stage that has received this rewrites its own route information table 1 (# 1) based on the VPI and VCI stored in the ACM signal. As described above, the source node 7 (#
A direct path between 1) → relay node 10 (# 2) → destination node 8 (# 3) is set.

As described above, in the second embodiment, since the direct path is set between all the nodes by using the normal call setting procedure, it is not necessary to add particularly complicated hardware.
Once the direct path is set, it is not necessary to set it again except when the node configuration is changed.

Next, the processing after the direct path from the source node to the destination node is set as described above will be explained. FIG. 7 shows a network configuration targeted by this embodiment. This figure is characterized in that a data conversion node 21 is omitted in FIGS. 4 and 5 for convenience of explanation.

In the data conversion node 21, for example, a layer mismatch between the calling terminal 6 and the receiving terminal 13, for example, one terminal is a G3 fax and the other terminal is a G4 fax.
It has a function to perform mutual data conversion in cases such as fax.

Next, the sequence of call connection and connection connection when there is a mismatch between terminals will be described with reference to FIG. First, when the call-out node 7 receives the setup signal from the call-out terminal 6, it analyzes the telephone number and receives the call-out node 8.
To decide. Then, the call connection request is notified to the destination node 8 through the direct path (route indicated by the broken line in FIG. 7) already set up above. The destination node 8 checks whether or not the terminal attributes of the source terminal 6 and the destination terminal 13 are matched, and returns a call connection completion notification to the source node 7. At this time, if the terminal attributes are inconsistent, information indicating the inconsistency is included in the call connection completion notification. As a result, the source node 7 recognizes that there is a mismatch between the terminals.

Next, the source node 7 selects the data conversion node 21 in the network and sends a connection connection request so that the data conversion node 21 arrives at the destination node 8 via the data conversion node 21. Specifically, this processing is the path information (VPI) and channel information (VCI) of the header 9.
Is rewritten to a path secured with the next-stage node, and the cell 11 in which the ID of the data conversion node 21 is registered in the information field 12 as a node selector is transmitted.

As a result, the connection connection request first establishes a link from the source node 7 to the relay node 10b, and then a link from the relay node 10b to the data conversion node 21 and a link from the data conversion node 21 to the destination node 8. Then, the destination node 8 sends a connection connection request to the destination terminal 13. At the data conversion node 21 in the middle of this process, the data from the transmitting terminal 6 is transferred to the receiving terminal 13
Is converted to a data format compatible with.

When the connection connection is completed at the terminating terminal 13, the connection connection completion notification is sequentially established by establishing a link from the destination node 8 to the data conversion node 21 to the relay node 10b to the origination node 7 in the reverse route. The connection completion notification is returned and the connection path is set.

As described above, in the first embodiment, the call connection and the connection are separated, and the connection connection in which the mismatch between the terminals is adjusted is realized. (Embodiment 2) FIG. 9 is a sequence diagram in the case where connection is established by upper and lower separate routes.

In the second embodiment, after the call connection is established by the direct path set from the source node 7 to the destination node 8, an upstream connection connection request is issued from the source node 7.
The case where the destination node 8 sends a downlink connection connection request in parallel is shown.

The details will be described below with reference to FIG. For convenience of explanation, FIG. 7 is referred to for the network configuration. First, regarding the call connection, the first embodiment is described.
The description is omitted because it is the same as.

After the call connection is completed, the originating node 7 sends an upstream connection connection request while securing a necessary band. In parallel with this, the destination node 8 sends a downlink connection connection request. The upstream connection connection request notification and the downstream connection connection request notification each independently reserve a necessary band and arrive at the destination node 8 and the source node 7 while establishing a link for each node.

In FIG. 9, the upstream connection connection request notification is from the originating node 7 to the relay node (10a) to the destination node 8, and the downstream connection connection request notification is from the destination node 8 to the relay node (10b) → the originating node. There are eight routes, and different routes are selected for the upper and lower routes.

When the destination node 8 receives the upstream connection connection completion notification (ACK) from the destination node 8 and the source node 7 receives the downstream connection connection completion notification, the connection connection is completed. These connection connection completion notifications (ACK) include the call number in the already established call connection as a parameter, so that the corresponding call can be identified in the originating node 7 and the terminating node 8.

As described above, in the second embodiment, the source node 7
By sending the connection connection request notification in parallel between the destination node 8 and the destination node 8, the connection connection processing can be performed at high speed.

In addition, the communication line can be efficiently used in a communication mode in which required bandwidths are different between the upper and lower routes, such as broadcast communication and broadcasting. (Third Embodiment) FIG. 10 is a sequence diagram when a connection is added from the source node 7 to the destination node 8 during communication.

FIG. 11 shows a state in which bandwidth is added in the network. In the third embodiment, the path addition control mechanism 22 is provided in the switching control device 2 of the source node 7.
Is provided. The path addition control mechanism 22 may be provided as hardware in the exchange control device 2, or may be provided as a software function of the exchange control device 2 itself.

In the third embodiment, as shown in FIG. 11, the call setup is performed by the direct path between the source node 7 and the destination node 8, and the connection path is the source node 7 indicated by the one-dot chain line in the figure. → Relay node "A" → Relay node "
It is assumed that the route is set to B ″ → destination node 8.

It is assumed that the path between the relay node "A" and the relay node "C" is communicating only with voice in a state where the free area is 50 Mbps. At this time, it is assumed that a request for transfer of moving image information of 150 Mbps is issued from the transmitting terminal 6. At this time, in the originating node 7, since the free area of the connection path leading to the destination node is 50 Mbps, the moving image information cannot be transferred by the current connection path (the one-dot chain line in the figure). Therefore, as shown in FIG. 10, a new connection connection request (path ADD) is transmitted by the path addition control mechanism 22 in the source node 7. This connection connection request (path ADD) is
This is performed by sending the cell registered in the information field with the band required for the connection and the call number of the connection as parameters to the node at the next stage. That is, each node first selects a route to the next stage, secures a band by a response from the next stage, sends a connection connection request to the node of the next stage, and establishes a link.
While securing the necessary band (150 Mbps) in this way, as shown by the chain double-dashed line in the figure, the originating node 7 → relay node “A” → relay node “B” → relay node “C” → destination node 8 A wideband connection path up to is newly set.

When it is only the upstream route (source node 7 → destination node 8) that the bandwidth needs to be expanded, the old connection path is set for the downstream route (destination node 8 → source node 7). You may keep it as it is.

In this way, when the connection connection completion notification (ADD-OK) is returned from the receiving terminal 13 and the destination node 8 to the source node 7, the communication is switched to the new connection path set above, and The moving picture information is transferred through a new connection path (path indicated by a chain double-dashed line in the figure).

According to the third embodiment, a new connection path having a wide band different from the existing connection path can be secured, so that the call loss rate can be kept low. (Embodiment 4) Similar to Embodiment 3, FIG. 12 shows that when a band change request is issued from the originating terminal 6, a part of the paths cannot secure the band or the communication line is used efficiently. It is a sequence diagram which shows the example of a connection path change at the time of reducing an unnecessary band.

For the sake of convenience, the network configuration will be described with reference to FIG. Here, the third embodiment
Similarly, a direct path is set between the source node 7 and the destination node 8, and the connection path is indicated by the one-dot chain line in the figure: source node 7 → relay node “A” → relay node “B”
→ It is assumed that the route was set to the destination node 8.

At this time, if a request for changing the band is issued from the transmitting terminal 6, an attempt is made to secure the band on the currently set connection path. At this time, the bandwidth change request from the source node 7 includes the node ID of the source node 7 and
The ID of the currently set connection path or the like is stored as a parameter in the information field 12 of the cell 11 and transmitted.

In FIG. 12, the bandwidth reservation request is notified from the relay node "A" to the relay node "C" using the currently set connection path. There is a shortage, and the band change between the relay node "A" and the relay node "C" is rejected. Therefore, the relay node "A" sends a connection connection request to the relay node "B" to secure the band. In the figure, the relay node “A” → relay node ”
A required band can be secured between B "and a new link is established. In this way, a new connection route is set while sequentially establishing links between relay nodes.

When the band change request reaches the terminating terminal 13 and the band change request is accepted, a band change completion notice is transmitted to the calling terminal 6. By this band change completion notification, the connection path of the old route is disconnected and the connection path to the new connection path is changed.

In this way, when the band change completion notification arrives at the originating node 7, communication is performed through a new connection path (path indicated by a chain double-dashed line in the figure). In the above description, the case of expanding the used band has been described, but the present embodiment can be applied to the case where the transfer of the moving image information is completed and the normal voice communication is resumed.

That is, when reducing the used band,
The originating node 7 may send the bandwidth change request while selecting a path that can secure the minimum bandwidth required for voice communication. In this way, by using the change of the connection path for the reduction of the used bandwidth, it becomes possible to use the communication line more efficiently.

(Fifth Embodiment) FIG. 13 is a sequence diagram showing a procedure of call connection and connection connection in a conference system using a network, and FIG. 14 is a block diagram showing a network configuration in the conference system of the fifth embodiment. ..

In FIG. 14, the media processing node 23
Are connected to each terminal device 6,
It has a function of sending to 13a and 13b. In addition, # 1 to # 6 in the figure respectively indicate relay nodes.

The originating node 7, which has received the setup signal from the originating terminal 6, receives the setup signal from the terminating node "A" (8a) and destination node "B" (8b) in advance via the direct path. A call connection request (conference SETUP) is sent to 13b.

Between the respective nodes (7 → 8a, 7 → 13)
When the call connection of b) is completed, each node 7, 8a and 8
In parallel, a connection connection request is issued from the relay node (#
1 to # 6) and is sent to the media processing node 23. Then, a connection path between each of the nodes 7, 8a, 8b and the media conversion node 23 is set while establishing a link in which a band is secured for each relay node. At this time, in the media processing node 23, in order to determine which connection connection request is a participant in which conference room, a unique call number within the network (for example, the ID of the calling node and a management call within the network). The cell 11 storing the number) in the information field 12 is used as a connection connection request.

As described above, according to the fifth embodiment, since the conference can be controlled (call setting) by a node (calling node 7 in FIG. 9) different from the conference bridge, load distribution can be realized. Furthermore, since the connection path can be set from each node to other nodes at the same time (in parallel), the connection path can be set at high speed.

[0070]

According to the present invention, since the connection connection is separated from the call connection, various connection connections can be performed while the call connection is maintained, or addition / change of the connection connection can be performed efficiently. In addition, various high-speed communication systems and services can be realized.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a diagram showing a cell format in ATM.

FIG. 3 is a diagram showing a cell format in ATM.

FIG. 4 is a diagram conceptually showing separation control between call setting and connection setting.

FIG. 5 is an overall diagram showing a network configuration of the first embodiment.

FIG. 6 is a block diagram showing a configuration of a maintenance center and a node.

FIG. 7 shows a target network configuration according to the first embodiment.

FIG. 8 is a sequence of call connection and connection connection when there is a mismatch between terminals in the first embodiment.

FIG. 9 is a sequence diagram in the case of performing connection connection by different routes in the second embodiment.

FIG. 10 is a sequence diagram when a connection is added from the source node to the destination node during communication in the third embodiment.

FIG. 11 is a network configuration diagram showing addition / change of bandwidth in the embodiment.

FIG. 12 is a sequence diagram showing an example of changing a connection path when there is a bandwidth change request in the fourth embodiment.

FIG. 13 is a sequence diagram showing a processing procedure in a conference system using a network in the fifth embodiment.

FIG. 14 is a block diagram showing a network configuration in a conference system according to a fifth embodiment.

FIG. 15 is a diagram for explaining a case where each node autonomously sets a direct path to another node in the embodiment.

[Explanation of symbols]

 1 ... Route information table 2 ... Switching control device 3 ... Switch device 4 ... Network configuration database 5 ... Maintenance center 6 ... Originating terminal 7 ... Originating node 8 ... Destination node 9 ... Header 10 ... Relay node 11-Cell 12-Information field 13-Termination terminal 14-Node management device 15-Direct connection table 16-General user table 17-Logical node database 18-Call connection analysis table 20 .. Connection connection analysis table 21. Data conversion node 22. Path addition control mechanism 23. Media processing node

Claims (4)

[Claims] 1. A cell (11) for transmitting information from a transmitting terminal (6).
Stored in the terminal and passed through multiple nodes to receive terminal (13)
In a communication network that transmits data to a node, a direct path (D-PA
SS), a source node (7) connected to a source terminal (6), a destination node (8) connected to a destination terminal (13), and a data conversion node (21) having a speed conversion function. The calling node (7) notifies the called node (8) and the called terminal (13) of the call connection request from the calling terminal (6) through the direct path (D-PASS), and the called terminal (13) ) And a call connection completion notification from the destination node (8), if the source node (7) detects a layer mismatch between the source terminal (6) and the destination terminal (13), The source node (7) sets a connection path (C-PASS) reaching the destination node (8) via the data conversion node (21) separately from the direct path (D-PASS). In a communication network Nekushon connection method. 2. A cell (11) for transmitting information from a transmitting terminal (6).
Stored in the terminal and passed through multiple nodes to receive terminal (13)
In a communication network that transmits data to a node, a direct path (D-PA
SS), a source node (7) connected to the source terminal (6), a destination node (8) connected to the destination terminal (13), and a relay node (10). 7) notifies the destination node (8) and the destination terminal (13) of the call connection request from the source terminal (6) through the direct path (D-PASS), and the destination terminal (13) and the destination node (8). ) Receives a call connection request completion notification from the above-mentioned direct path (D-PASS), and then a connection path (C-PASS) setting request is received from the calling node (7) and the called node (8) in parallel. A connection connection method in a communication network, which transmits to a node (8) and a source node (7). 3. A cell (11) for transmitting information from a transmitting terminal (6).
Stored in the terminal and passed through multiple nodes to receive terminal (13)
In a communication network that transmits data to a node, a direct path (D-PA
SS) and the path addition control mechanism (22) connected to the originating terminal (6)
A destination node (8) connected to the receiving terminal (13) and a relay node (10), and the call connection is completed through the direct path (D-PASS). , A connection path (C-PA) from the source node (7) to the destination node (8) via the relay node (10).
SS) is set, the connection path (C-PAS) is sent from the originating terminal (6).
When there is a bandwidth addition request of S), the source node (7) controls an additional path different from the connection path (C-PASS) by the destination node (8) under the control of the path addition control mechanism (22). A connection connection method in a communication network that is set independently for each other. 4. A cell (11) for transmitting information from a transmitting terminal (6).
Stored in the terminal and passed through multiple nodes to receive terminal (13)
In a communication network that transmits data to a node, a direct path (D-PA
SS), a plurality of nodes (7, 8a, 8b) to which source / reception terminals (6, 13a, 13b) are respectively connected, and a media processing node for distributing and transmitting a signal from any one of the nodes to the plurality of nodes. (23), after completing the call connection between the nodes participating in the conference through the direct path (D-PASS), a connection connection request from each node is sent to the media processing node (2).
A connection connection method in a communication network characterized in that all other nodes participating in the conference are notified via a relay node via 3).