JPH01286651A - Communication system - Google Patents

Abstract

PURPOSE:To simplify control, to reduce the division loss of a transmission line and to increase a use efficiency by controlling so that the sum of the sending speed of respective transmission nodes cannot exceed the capacity of the transmission line between terminal station nodes. CONSTITUTION:A transmission node 1a delimits the information from a transmission line 17 to a prescribed length, gives a virtual pulse identifier defined in a transmission line 13a corresponding to a reception node to be transmitted, constitutes a cell and sends it to the transmission line 13a. A terminal station node 7 receives the cell from the transmission line, refers to a table 24, rewrites the identifier and outputs it through a switch 9. A terminal station node 8 executes the same processing as the node 7 and a cell 19b from the node 1a is sent to a receiving node 2b as a cell 23a. The cell from transmission nodes 1a and 1b is multiplexed to a transmission line 14b. The nodes 1a and 1b control so that the sum of the sending speed of respective nodes of the cell having the identifier toward the transmission line 14b cannot exceed the capacity of the transmission line 14b.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a system for sharing a transmission path between a plurality of points,
It relates to a communication method for communicating.

[Conventional technology]

The prior art will be explained using FIG. 5. FIG. 5 shows the configuration of a conventional general communication network, with 51a to 5
1c, 52a to 52c are subscriber exchanges, 55.56 is a relay exchange, and 528a to 528c.

529a to 529c, 530.531 are the communication path switches of the respective exchanges, 513a to 513c, 514a
514c, 515, and 516 indicate control units of the respective subscriber line exchanges and trunk exchanges. Also, 57 a
~57 c, 58 a ~58c, 59a ~59c,
510a to 510c, 511a to 511c, 512
A to 512c transmit signals from the exchange to transmission paths 51, respectively.
7a~517C1518a~518e, 519a~5
It is a multiplexing device that multiplexes signals from the transmission line to 19c, and conversely separates signals from the transmission path and sends them to the exchange.It has the role of configuring a certain number of lines 520.521.522 with a constant speed between the exchanges. . These lines are set semi-fixedly depending on the traffic demand between exchanges.

In FIG. 5, a communication request signal from a subscriber passes through the subscriber line, and a zero communication request that arrives at the terminal 53a of the subscriber line exchange 51a, for example, is not accepted by the control unit 513a of the subscriber line exchange 1115j, 1115j, l. After that, the control unit checks the availability status of the transit exchange on the route leading to the subscriber line exchange 52C to which the connection request is made, the availability status of the subscriber line exchange 52C, and the availability status of the outgoing line of each exchange, of each exchange. Confirm by communicating with the control unit 515, 516, 514c consisting of control system devices, and if there are any vacancies in all of them,
Communication is started by connecting the incoming circuit line and the outgoing line at each exchange as shown in the route 524.525.526.527.

[Problem to be solved by the invention]

In the conventional communication network configuration system described above, a certain number of lines with a constant speed must be set in advance in anticipation of traffic demand, and the network cannot be operated flexibly in response to sudden changes in demand. In addition, the line usage efficiency could not be improved very much, leading to an increase in network costs.

Furthermore, in response to communication requests from subscribers, each relay exchange must perform control such as selection of an available line for each call, leading to complicated control. Furthermore, in conventional communication network configuration systems, the multiplexing equipment that sets up lines and the switching equipment that selects lines are separated, which also increases network costs, complicates maintenance and operation, and reduces transmission quality. However, the present invention solves the above-mentioned problems such as the complexity of maintenance and operation in conventional networks, the complexity of control within the system, and the complexity of control within the system. It is an object of the present invention to provide a communication system that solves drawbacks such as increased cost and decreased transmission quality.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention transmits a cell in which a receiving node to which the transmitted information is destined or an address indicating the route to the receiving node is added to the transmitted information, and the speed is increased from zero to a finite speed defined by the information transmission speed. a plurality of transmitting nodes that transmit cells with different values; at least one or more receiving nodes that receive cells transmitted from the transmitting nodes; and at least one receiving node that receives cells transmitted from the transmitting nodes or other terminal nodes; At least one or more terminal nodes that transmit the cell to a predetermined receiving node or another terminal node according to an address attached to the cell, and the transmitting node, the receiving node, and the terminal node are connected. The digital transmission path for transmitting cells and the total transmission speed of cells output from the terminal node to the digital transmission path connected to the terminal node are each within the maximum speed determined by the capacity of the digital transmission path. This communication system is characterized by comprising means for controlling the transmission rate of cells directed toward the digital transmission path at the transmitting node.

The present invention is also effective when applied to a bidirectional system, and a cell in which a receiving node to which the transmitted information is destined or an address indicating the route to the receiving node is added to the transmitted information is specified by the information transmission speed from zero. A plurality of transmitting/receiving nodes transmit cells at different speeds up to a finite speed, and receive cells transmitted from opposing transmitting nodes, and receive cells transmitted from the transmitting/receiving nodes or other terminal nodes. , at least one terminal node that transmits the cell to a transmitting/receiving node or another terminal node determined in advance according to the address added to the cell, and the transmitting/receiving node and the terminal node are connected to each other. and the total transmission speed of cells output from the end node to the digital transmission path connected to the end node is within the maximum speed determined by the capacity of the digital transmission path. This communication system is characterized in that it is comprised of means for controlling the sending speed of cells directed toward the digital transmission path at the sending and receiving nodes.

[For production]

In the present invention, on the transmitting side of a transmitting node such as a subscriber line exchange or a transmitting/receiving node, an address indicating the destination receiving node such as a subscriber line exchange or transmitting/receiving node is added to transmission information in a cell, which will be described later. The cells are transmitted within a speed limit given by the control of At least one terminal node having only the function of receiving a cell and transmitting the cell to a predetermined transmitting/receiving node or another terminal node according to the address attached to the cell, and The transmitting/receiving node and the terminal node are connected by a digital transmission line, and each terminal is connected so that the total transmission rate of cells output from a certain terminal node to a certain digital transmission line does not exceed the maximum rate determined by the capacity of the digital transmission line. It is characterized by comprising means for controlling the sending speed of cells toward the digital transmission path on the sending side of each sending node or sending/receiving node. In other words, only the route that cells take between the transmitting node and the receiving node or between the receiving nodes is predetermined (this route is hereinafter referred to as a vertical cell path), and its capacity is limited by the number of calls made from the originating exchange, etc. A major feature is that the route is allocated only in response to the request of the user, within a range that does not exceed the transmission speed limit of the transmission line that the route passes. In this way, unlike the conventional technology in which a line with a fixed capacity is set in advance and selected at intermediate exchanges in response to calls, etc., this technology simplifies control and is more economical. In addition, there is no need to set up lines of various speeds between nodes in advance depending on demand, and division loss of transmission lines can be reduced. Examples will be described below.

〔Example〕

First, the principle of construction of the present invention will be explained with reference to FIG. In FIG. 1, it is assumed that signals flow in one direction from left to right for ease of explanation. la in Figure 1.

1b is a sending node, 2a, 2b are receiving nodes, 3a, 3
b, 5a, 5b are respective switch parts, 4a, 4b,
6a and 6b are respective control units, 7.8 is a terminal node,
9, IO are respective switch parts, 11S12 are respective control parts, 13a, 13b, 14a to 14c, .
15a, 15c, 16a.

16b is a digital transmission line, 17al to a3.17b
1 to b3.18al to a3.18bl to b3 indicate transmission paths such as access lines that connect the terminal to the transmitting node and the receiving node. Also, 19a to 19c, 20a to 20
c, 21a-21c, 22a-22c, 23a
~23c are transmission lines 13a, 13b, 14b, respectively.
It shows the signals flowing through 16a and 16b, that is, the form of cells.

Furthermore, FIG. 2 shows the format of the signal handled by the communication network in FIG. It is a field.

In FIG. 1, reference numeral 24 indicates a conversion table for the verticell bus identifier in the terminal node 7, as an example.As shown in the conversion table 24, the control unit of each terminal node is configured to transmit The cells sent to the road,
Mutual correspondence relationships are stored in advance so that cells output from the terminal nodes correspond to each other.

Information transfer from the sending node la to the receiving node 2b is performed as follows. That is, the sending node 1a is connected to the transmission path 1
The transmission information arriving through 7a1 to 17a3 is divided into certain lengths, and a cell is formed by adding a verticell path identifier defined in the transmission path 13a corresponding to the receiving node to which the data is to be transmitted, and sent to the transmission path 13a. . The terminal node 7 receives the cell from the transmission path, reads the verticell path identifier written in the cell, refers to the table 24 stored in the control unit in advance, and assigns the identifier to the corresponding output transmission path. Rewrite to birch cell path identifier,
The switch section 9 distributes the signals to the output transmission paths and sends them out. In general, in order to prevent cell collisions on output transmission paths, when cells arriving at the same time from multiple input transmission paths are directed to the same output transmission path, the switch unit 9 temporarily stores the cells and sequentially sends them out. , a storage type switch is used. The terminal node 8 performs the same processing as the terminal node 7, and as shown in the figure, the cell 19b from the transmitting node la is delivered to the receiving node 2b as a cell 23a.

In FIG. 1, cells from transmitting nodes 1a and 1b are multiplexed on transmission path 14b. In the zero-start mode, the above configuration is adopted, and the transmitting node 1
a and 1b, the verch cell path identifier toward the transmission path 14b (in the table 24, the transmitting node 1a
is characterized in that control is performed so that the sum of the transmission speeds of the respective nodes of the cell having VPIs 2 and 5, and VPI 4 in the transmitting node 1b, does not exceed the transmission capacity of the transmission line 14b.

FIG. 3 is a diagram explaining the first embodiment of the present invention,
313.31b receives communication requests from subscribers through the subscriber lines 321a and 321b, issues a desired allocation request to the control center 39 that allocates verticel bus capacity, and when the request is accepted, transmits a signal from the subscriber. The digital transmission lines 311a, 31 are arranged in a cell format as shown in FIG.
Calling side subscriber line exchange (sending node) sending to 1b
, 323a, 323b are the communication path switch sections, 33a
, 33b is a control section. 310 is a control link connecting each subscriber line exchange and the control center.

There may be two or more control centers 39, and the functions of the control center 39 are the control units 33a, 33 of each subscriber line exchange.
311a, 311b, which may be distributed in b.
312a to 312e, 313a, and 313b are digital transmission lines that transfer signals from left to right in the figure. 32a and 32b are subscriber line exchanges (receiving nodes) on the receiving side that sort cells sent from transmission lines 313a and 313b by destination and send them to predetermined subscribers via subscriber lines 322a and 322b; 3
24b is the communication path switch section 34a.

34b is a control section. 35.36 is a cross-connect multiplexing device (terminal node) that distributes cells sent from transmission lines from various directions to each destination based on the information written in the cell header and sends them to the desired transmission line. , 325
．． 326 is each switch section, and 37 and 38 are each control section. 314.315.316.317.
318, 319, and 320 indicate connection paths of each switch section.

The communication operation will be explained using FIG. 3 and FIG. 2.

Upon receiving a communication request from a subscriber, the originating subscriber line exchange 31 (31a, 3lb are collectively referred to hereinafter in accordance with this example) connects the terminating subscriber line to the control center 39 through a control link 310. Control center 3 issues a request to allocate a verticel path with a certain transmission capacity to the exchange.
Step 9 examines the usage status of the transmission line in which the verticel path connecting the originating subscriber line exchange 31 and the terminating subscriber line exchange 32 is accommodated, based on the past verti cell path allocation status;
If there is a vacancy, communication permission is issued to the originating subscriber line exchange that issued the allocation request. After receiving permission to receive the call, the subscriber line exchange 31 also checks the blockage state in the subscriber line exchange on the destination side, and then issues communication permission to the calling subscriber and a paging signal to the called subscriber, and information transfer is started. . The information signal from the subscriber is sent to the subscriber's terminal or subscriber line exchange 31.
The scent is cut to length and placed in the information field of the cell.

Subsequently, the subscriber line exchange 31 adds a logical channel number (3 in FIG. 2) for identifying the subscriber or service content. At the time of system installation, the subscriber line exchange on the originating side and the subscriber line exchange on the terminating side decide which subscriber on the originating side and which subscriber on the terminating side will use a certain logical channel number for communication. Alternatively, it can be assigned in advance at the time of making a call (in addition, the subscriber line exchange 31
The cross-connect multiple subscriber equipment 35, which has received the cell from the transmission line 311, assigns to the cell a vertical cell path identifier that identifies the route to the subscriber line exchange 32, which is the destination of the connection, and sends the cell to the transmission line 311. The route allocation stored in the control unit 37 is sent to a predetermined transmission transmission line 312 according to the control information. The cross-connect multiplexing device 36 also performs the same operation as the cross-connect multiplexing device 35.

Verticel paths connecting the subscriber line exchanges on the originating side and the subscriber line exchanges on the terminating side are determined at the time of setting up the communication network, depending on the network design conditions, and A control unit of a connected cross-connect multiplexing device is stored in advance to which transmission path it is to be distributed when a cell having a certain verticell bus identifier is received from a certain transmission path. Further, the control unit of the subscriber line exchange also stores which verticel path identifier is used for the verticel path connecting which opposing subscriber line exchange. A plurality of verticel paths are allocated between subscriber line exchanges as necessary. The verticell path identifier may be defined for each transmission path and exchanged in some way in the cross-connect multiplexer, or it can be arbitrarily defined and exchanged in the cross-connect multiplexer regardless of the transmission path. It is also possible to pass the meeting without doing so.

314.315.316 in Fig. 3 indicates the connection form of the verticel path accommodated in the transmission path, and 318.31
Reference numeral 9 represents the connection form of the verticel path within the cross-connect multiplexing device, and 317 and 320 represent the connection paths showing the connection form within the subscriber line exchange.

With the configuration described above, there is no need for a relay exchange with complicated functions that performs line concentration and routing processing for each call, as in the past, between subscriber line exchanges. It becomes possible to perform communication without incurring division loss.

The above describes a method for controlling the capacity allocation of the verticel bus each time there is a communication request from a subscriber. By allocating a certain amount of vertical cell path capacity in advance to a subscriber, and without controlling the vertical cell path capacity allocation for each communication request from a subscriber, when the total cell transfer rate changes significantly or due to a failure in the transmission line, etc., the vertical cell path It is also possible to perform verch cell path capacity allocation control only when the state changes, and the same effect can be obtained with even simpler control.

FIG. 4 is a diagram illustrating a second embodiment of the present invention,
Unlike FIG. 3, this configuration shows a bidirectional system. 41
a, 4lb, 42a, 42b are subscriber lines 421a, 42lb, or 422a
, 422b, receives a communication request from the subscriber, issues a desired allocation request to the control center 49 for allocating verticell path capacity, and when the request is accepted, converts the signal from the subscriber into a cell format as shown in FIG. Subscriber line exchanges, 423a, 423b, 424, which send out cells to the transmission line, and conversely distribute cells sent from the transmission line by destination, and send them to predetermined subscribers through the subscriber line.
a, 424b are the communication path switch parts, 43a, 43b
, 44a, 44b are control units. 410 indicates each subscriber line exchange 413, 41b, 42a, 42b and the control center 4.
This is a control link connecting 9. There may be two or more control centers 49, and the function of the control center 49 is the control section 43a of each subscriber line exchange.

They may be distributed in 43b, 44a, and 44b.

411a, 411b, 412a-412e.

413a and 413b are bidirectional digital transmission lines, respectively. 45.46 is a cross-connect multiplexing device that distributes cells sent from transmission lines from various directions to each destination based on information written in the cell header and sends them to a desired transmission line. Each switch section, 47.48, each control section, 414 to 420
is the connection path of each switch section.

In this configuration, communication is performed in the same manner as in the first embodiment, and there is no need for a relay exchange that performs line concentration and routing processing for each call between the subscriber line exchanges as in the past. It becomes possible to perform communication without causing division loss between lines.

〔Effect of the invention〕

As described above, according to the present invention, cells transmitted from the transmitting node or the transmitting unit of the transmitting/receiving node are received and transmitted between the transmitting node and the receiving node or between the transmitting and receiving nodes for each cell. A receiving node that is determined in advance according to the address written in the cell or a receiving unit of a transmitting/receiving node is connected via a digital transmission path to a plurality of terminal nodes that transmit the cell, and the transmitting node and the receiving node are connected to each other via a digital transmission path. Alternatively, communication between sending and receiving nodes is made possible by controlling the transfer rate of cells transmitted from the sending node or sending/receiving nodes so that the total transfer rate of cells transferred on the transmission path corresponding to the route does not exceed the allowable rate. Compared to the conventional communication system that required a relay switch between transmitting and receiving nodes to perform line concentration and routing processing for each call, it is easier to control, more economical, and can be used to meet demand in advance. Since there is no need to set lines of various speeds between the nodes, it is possible to reduce the division loss of the transmission line and to improve the efficiency of using the transmission line.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the present invention in detail, FIG. 2 is a diagram showing the shape of a cell which is a transfer format of transmission information in an embodiment of the invention, and FIGS. FIG. 5 is a diagram showing the configuration of a conventional communication network. l...Cell, 2...Birch cell path identifier, 3...
- Logical channel number, 4... Information field, 1a,
1b... Sending node, 2at2b... Receiving node,
3a+3b...switch section, 4a, 4b...control section, 5a. 5b... switch section, 5a, 5b... control section, 7.
8... Terminal node, 9, 10... Switch section, 11
．． 12...control unit, 13a, 13b, 14a to 14
c, 15a, 15c, 16a, 16b--digital transmission line, 17al-a3, 17bl-b3. '18
a1-a 3. 18 b 1 to b 3...transmission line,
19a-19c, 20a-20c, 21a-21c
, 22a to 22c, 23a to 23c-cell, 24... Conversion table configuration of verti cell path identifier, 31a, 31b... Calling side local exchange (transmission node), 32a, 32b... Calling side Subscriber line exchange (receiving node), 321a, 321b, 322a,
322b. 421a, 421b, 422a, 422b... subscriber line, 418.41b, 42a, 42b... subscriber line exchange, 311a, 311b, 312a to 312e, 3
13a, 313b, 411a, 411b. 412a to 412e, 413a, 413b...-digital transmission line, 323a, 323b, 324
a. 324b, 423a, 423b, 424a, 4
24 b--Communication path switch section, 33a, 33b, 3
4a, 34b, 43a, 4.3b, 44a, 44b-・
Control unit, 35.36.45.46... Cross-connect multiplexing device, 325.326.425.426... Switch unit, 37.38.47.48... Control unit, 51
a~51c, 52a~52cm... subscriber line exchange,
55.56...Relay switch, 528a-528C15
29a to 529C1530, 531...Call path switch, 513a to 513c, 514a to 514c, 5
15.516...control unit, 53a to 53c, 54
a ~ 54 b - Switch terminal, 57a ~ 57C15
8a ~ 58c, 59a ~ 59c, 510a ~ 510
c, 511a ~ 511c, 512a ~ 512c
=-Multiplexer, 517a to 517c, 518a
~518c, 519a~519C...transmission line, 520
~522...Line, 524~527...Route Patent applicant Nippon Telegraph and Telephone Co., Ltd. agent Patent attorney Tama Mushi Kugobe (2 others) 1. Cell Transfer format of transmission information in the embodiment of the present invention The t-le shape of the second figure

Claims (2)

[Claims] (1) Multiple transmissions in which cells to which transmission information is appended with an address indicating the destination receiving node of the transmission information or the route to the receiving node are sent at varying speeds from zero to a finite speed defined by the information transmission speed. a node; at least one or more receiving nodes that receive cells sent from the sending node; and at least one receiving node that receives cells sent from the sending node or another terminal node and sends an address to the address attached to the cell. Therefore, at least one or more terminal nodes that transmit the cell to a predetermined receiving node or another terminal node, and digital transmission that connects the transmitting node, the receiving node, and the terminal node to transmit the cell. and the total transmission rate of cells output from the end node to the digital transmission path connected to the end node is within the maximum speed determined by the capacity of the digital transmission path at each sending node. 1. A communication system comprising: means for controlling the transmission rate of cells directed toward said digital transmission path. (2) Sends a cell with an address indicating the destination receiving node of the transmitted information or the route to the receiving node added to the transmitted information at a speed varying from zero to a finite speed specified by the information transmission speed, and sends the cell to the opposite side. a plurality of transmitting nodes that receive cells sent from transmitting/receiving nodes that receive cells; at least one terminal node that transmits the cell to a transmitting/receiving node or another terminal node; a digital transmission line that connects the transmitting/receiving node and the terminal node and transmits the cell; and the terminal node. The cells are sent to the digital transmission line at each transmitting/receiving node within the maximum speed determined by the capacity of the digital transmission line, so that the total transmission rate of cells output from the terminal node to the digital transmission line connected to the terminal node is within the maximum speed determined by the capacity of the digital transmission line. 1. A communication method comprising means for controlling a cell transmission rate.