JP3002547B2 - ATM traffic control device and ATM traffic control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an asynchronous transfer mode (ATM: Asynchronous Tr
ansfer Mode), voice, data,
Control the traffic of multimedia information such as images
The present invention relates to an ATM traffic control device and an ATM traffic control method.

BACKGROUND ART Broadband ISDN (Integrated Service Digital Network)
ATM is attracting attention as the mainstream technology of k).

FIG. 28 is a cell structure diagram showing the structure of a cell used in this ATM.

In FIG. 28, reference numeral 2801 denotes a cell used in ATM, 2
Reference numeral 802 denotes a cell header including control information of the cell 2801, and reference numeral 2803 denotes a cell information section including data information and voice information of the cell 2801. At ATMs, voice, data, images, facsimile, etc.
A cell information section 2803 is created by dividing all information into a certain length, and a cell header 2802 including information such as a logical channel number (VCI: Virtual Call Indicater) necessary for exchange of the cell 2801 is added to the cell information section 2803. Cell 2801 is created. It is possible to perform uniform transmission in the form of this cell 2801. In particular, voice communication and LAN (Local Area)
In intra-company communication where data communication represented by inter-network communication is the mainstream, it is expected to construct an efficient transmission switching network by integrating these traffics using ATM technology.

FIG. 29 is a network configuration diagram showing a configuration example of an integrated voice / data network using this ATM.

In FIG. 29, reference numeral 2901 denotes an ATM multiplex transmission apparatus for multiplexing cells, 2902 denotes an ATM switching network, 2903 denotes a data ATM terminal for setting a data connection and transmitting a data cell, and 2904 denotes a voice connection for setting a voice connection and transmitting a voice cell. Voice ATM
Terminal, 2905 is local data ATM line, 2906 is local voice system A
TM line, 2907 is a wide area ATM line connecting ATM multiplex transmission apparatus 2901 and ATM switching network 2902, 2908 is provided in ATM multiplex transmission apparatus 2901, data ATM terminal 2903 and private data system ATM line 29
Data ATM line termination connected via 05, 2909 is A
A voice ATM line termination unit provided in the TM multiplex transmission device 2901 and connected to the voice ATM terminal 2904 via the private voice ATM line 2906, and a multiplex transmission unit 2910 provided in the ATM multiplex transmission device 2901.

 Next, the operation will be described.

In the ATM multiplex transmission apparatus 2901, the cell received by the data ATM line termination unit 2908 and the cell received by the voice ATM line termination unit 2909 are multiplexed by the multiplex transmission unit 2910 to form a wide area AT.
Sent to M line 2907.

In intra-company communication, efficient use of the wide area ATM line 2907 shown in FIG. 29 is required. Generally speaking, voice communication
Since about 50% of the time is silence, voice ATM terminals 2
904, in order to enhance the efficiency of the line, audio information of only a sound part (hereinafter referred to as an audio cell) is transmitted every cell cycle (T).
It operates so as not to transmit the silence part by transmitting it on the private ATM line 2906.

On the other hand, voice communication generally requires more real-time performance than data communication.
Transmits to the wide area ATM line 2907 with priority given to the voice cell transmitted from the voice ATM terminal 2904, and the data information (hereinafter referred to as data cell) transmitted from the data ATM terminal 2903 has no voice cell to be transmitted. It operates to transmit to the wide area ATM line 2907 using the idle time.

A method of realizing a conventional multiplex transmission unit 2910 that realizes such multiplex transmission of voice and data by ATM is, for example,
IEEE Transaction on Communication Vol.41 No.1
1 “Analysis and Engineering of a Voice / Data
Packet Multiplexer ", pp. 1656-1667.

FIG. 30 is a configuration diagram showing the configuration of this conventional multiplex transmission unit 2910. In the figure, reference numeral 3001 denotes an audio / data identification unit for identifying whether a received cell is audio or data, and 3002 stores data cells to be transmitted. A data cell transmission buffer 3003, a voice cell transmission buffer for storing voice cells to be transmitted, 3004, a transmission circuit for transmitting voice cells or data cells, 3005, a reception circuit for receiving voice cells or data cells, 3006, a reception circuit. Reference numeral 3005 denotes a reception buffer for storing received voice cells or data cells.

 Next, the operation will be described.

In FIG. 30, a voice / data identification unit 3001 is a data system.
The cell arriving from the ATM line terminating unit 2908 or the voice ATM line terminating unit 2909 is identified as a voice cell or a data cell.If the cell is a voice cell, the data is stored in the voice cell transmission buffer 3003. The data is accumulated in the transmission buffer 3002.

Next, when voice cells are stored in the voice cell transmission buffer 3003, the transmission circuit 3004 takes out the voice cells and transmits them to the wide area ATM line 2907. Also, if no voice cells are stored in the voice cell transmission buffer 3003 and if data cells are stored in the data cell transmission buffer 3002,
Take it out and send it to the wide area ATM line 2907.

On the other hand, a cell arriving from another terminal via the wide area ATM line 2907 is received by the receiving circuit 3005, and then stored in the reception buffer 3006.
908 or transmitted to the voice ATM line termination unit 2909. As described above, multiplex transmission of voice and data is realized by separating the data buffer and performing preferential transmission of the voice cell.

However, in this case, when the traffic of the voice cell increases, the probability that the data cell is waited in the data cell transmission buffer increases, and when the buffer amount of the data cell transmission buffer is small, a buffer overflow occurs and a part of the buffer overflows. The cell will be discarded. In order to suppress the cell loss rate due to the buffer overflow to an appropriate amount, a large buffer amount is required for the data cell transmission buffer.

In recent years, it has become clear that when ATM is applied to wide area network data communication such as LAN-to-LAN communication, the communication efficiency becomes extremely poor unless the cell loss rate is kept low.
On the other hand, for example, in the 1996 IEICE General Conference SB-10-5 “Quality Evaluation of ABR Service Class”, a method in which the data terminal adjusts the transmission rate according to the network load is an effective measure. It is shown that

FIG. 31 is a sequence diagram showing a method for adjusting the transmission rate, and shows a transmission sequence in a normal state of the data ATM terminal 2903a.

FIG. 32 is a sequence diagram for adjusting the transmission rate, and shows a transmission sequence in an abnormal state of the data ATM terminal 2903a.

FIG. 33 is an RM cell structure diagram showing a format of a data traffic control cell (hereinafter, referred to as an RM cell) for controlling data traffic appearing in the sequences of FIGS. 31 and 32.

33, reference numeral 3301 denotes a cell, 3302 denotes an example of a header indicating an RM cell, 3303 denotes an information section of the cell 3301, and 3304 denotes a transfer rate designation value included in the information section 3303.

First, a method of adjusting the transmission rate will be described with reference to FIG.

Each time the data ATM terminal 2903a on the transmitting side transmits a data cell, the predetermined number of times (this is (Nrm-1) times. Nrm: RM cell transmission rate = Number of cells / RM interval) RM cell (forward RM
(Called a cell) once. Data ATM terminal 2 on the receiving side
The 903b returns this RM cell and returns it to the data ATM terminal 2903a on the transmitting side (this is called a backward RM cell). This RM cell includes a transfer rate designation value 3304 indicating a transfer rate at which the data ATM terminal 2903a shown in FIG. 33 can transmit.

In FIG. 31, the period Td is a period for changing the transmission rate of the data ATM terminal 2903a. Since the period Td is determined by the rate Nrm of transmitting RM cells, the period Td dynamically fluctuates due to a change in the transmission rate.

The data ATM terminal 2903b on the receiving side sets a transfer rate that can be processed by itself to the transfer rate designation value 3304 shown in FIG. 33 when returning the backward RM cell. Backward RM
The cell is transmitted to the data ATM terminal 2903a on the transmitting side via the ATM multiplex transmission apparatus 2901 or the ATM switching network 2902, and the transfer rate specification value 3304 set at that time is transmitted to the ATM multiplex transmission apparatus 2901 or the ATM switching network. If the transfer rate that can be processed by 2902 is exceeded, this ATM multiplex transmission device 2901 or ATM switching network
The 2902 (hereinafter, the ATM multiplex transmission apparatus 2901 or the ATM switching network 2902 may be referred to as a node) resets the transfer rate specification value 3304 of the RM cell to a transfer rate that can be processed by itself, and relays.

In this way, when the backward RM cell arrives at the transmitting side, the minimum value of the transfer rate that can be processed by each node provided on the route through the cell is the transfer rate designated value 33.
It will be set to 04. That is, the transfer rate designation value 3304 of the RM cell indicates the transferable rate of the node that becomes a bottleneck on the route. The data ATM terminal 2903a that has received the backward RM cell adjusts the cell transmission interval according to the received RM cell transfer rate designation value 3304 and continues the transfer.

This makes it possible to realize transfer control dynamically following the state of the network.

FIG. 32 is a sequence diagram showing an adjustment sequence when the backward RM cell is not sent to the transmitting side for some reason. In this case, the data ATM terminal 2903a stores the forward RAM cell in the forward RAM cell a specified number of times (hereinafter, referred to as Crm: Crm:
Number of Outstanding forward RM cells allow
ed before cutoff) If a backward RM cell is not received even after transmission, the transmission rate is reduced and cell transmission is performed. That is, if the backward RM cell cannot be received,
The mechanism is such that the network is determined to be congested and the transmission rate is automatically suppressed, and congestion can be automatically suppressed.

As described above, the method of controlling the transmission rate of the data ATM terminal 2903 can adjust the transfer rate according to the state of the network.
In the TM switching network 2902, congestion can be avoided without requiring a large buffer, but in order to make this mechanism effective, a node in the network, that is, the ATM multiplex transmission apparatus 2901 or the ATM switching network 2902 processes itself. It is necessary to know the possible transfer rate and to specify this to the transmitting terminal. In particular, in a corporate communication network that requires efficient use of the wide area ATM line 2907, accurate control is required, but there is no specific means.

As described above, in the conventional ATM multiplex transmission apparatus, when multiplexing voice and data, a voice cell is simply transmitted in preference to a data cell, so a large buffer is required to suppress the cell loss rate of data. There was a problem that.

There is also a problem that there is no ATM track control device in which the data terminal on the transmitting side specifically adjusts the transmission rate so that the transmission rate can be processed by nodes such as an ATM multiplex transmission device and an ATM switching network. Was.

The present invention has been made in order to solve the above-described problems, and has been made to solve the above-described problems. An ATM traffic control device that suppresses a cell loss rate of data to an appropriate value with a small-capacity buffer for excessive traffic from a data terminal is provided. And an ATM traffic control method.

DISCLOSURE OF THE INVENTIONThe ATM traffic control device according to the present invention includes a plurality of voice connections for transferring voice information communicated between voice ATM terminals using voice cells and data information communicated between data ATM terminals as data cells. An ATM (Asynchronous ATM) that accommodates a data connection to be transferred using a data traffic control cell (hereinafter referred to as an RM cell) on the same ATM line.
Transfer mode) The ATM traffic control device provided in the multiplex transmission device monitors the arrival status of voice cells in the plurality of voice connections sent from the voice ATM terminal at predetermined intervals, and arrives at the next period. A transmission rate determining unit for predicting the number of data traffic and determining a data traffic transmission rate; a transmission rate for receiving a data traffic control cell from an ATM line, setting the transmission rate in the data traffic control cell, and transmitting the data to the data ATM terminal And a change unit.

The ATM traffic control device according to the present invention includes a data ATM
A transmission buffer for receiving and storing data cells from the terminal and voice cells from the voice ATM terminal, a transmission circuit for transmitting the cells of the transmission buffer, and a prediction coefficient based on the number of voice connections connected simultaneously. A rate calculating circuit that calculates a transferable rate based on the prediction coefficient and the number of arriving voice cells, and processes an RM cell including a transfer rate specification value that specifies a transfer rate to a data ATM terminal on the transmission side. RM cell processing circuit, a reception circuit for receiving cells, and a reception buffer for storing received data cells, wherein the RM cell processing circuit has a rate higher than a transfer rate specification value included in the RM cell. If the value of the transferable rate from the calculation circuit is small, the transfer rate designation value included in the RM cell is replaced with the value of the transferable rate from the rate calculation circuit. The features.

The rate calculation circuit of the ATM traffic control device according to the present invention determines whether or not a voice cell is used as voice band data, and individually arrives at a voice cell having voice information and a voice cell of voice band data. It is characterized in that the number of arriving voice cells in the next cycle is predicted based on the result of monitoring the situation and the transmission rate of data traffic is determined.

The ATM traffic control device according to the present invention includes a data ATM
A transmission buffer for receiving and accumulating data cells from the terminal and voice cells from the voice ATM terminal, a transmission circuit for transmitting cells in the transmission buffer, monitoring signaling information, and connecting simultaneously based on the signaling information. A signaling monitor circuit for creating the number of simultaneous voice connections (hereinafter referred to as the number of simultaneous connections); obtaining a prediction coefficient based on the number of simultaneous connections; and transmitting its own transmission based on the prediction coefficient and the number of incoming voice cells. A rate calculation circuit that calculates a possible rate; an RM cell processing circuit that processes an RM cell that includes a transfer rate specification value that specifies a transfer rate to a data ATM terminal on the transmission side; a reception circuit that receives the cell; And a receiving buffer for storing the data cells.

The rate calculation circuit of the ATM traffic control device according to the present invention is characterized in that when the number of simultaneous voice connections exceeds a specified value, the rate calculation circuit predicts the arrival state of a voice cell in the next cycle based on the number of simultaneous connections. .

The rate calculation circuit of the ATM traffic control device according to the present invention is characterized in that the data ATM terminal predicts the number of cells arriving in this cycle from the cycle of changing the transmission rate and the arrival state of voice cells.

The ATM traffic control device according to the present invention includes a data ATM
A transmission buffer for receiving and storing data cells from the terminal and voice cells from the voice ATM terminal, a transmission circuit for transmitting the cells of the transmission buffer, and a prediction coefficient based on the number of voice connections connected simultaneously. A rate calculating circuit for calculating its own transferable rate based on the prediction coefficient and the number of incoming voice cells, and an RM cell including a transfer rate designation value for designating a transfer rate to a data ATM terminal on the transmitting side. RM cell processing circuit that processes data, a reception circuit that receives cells, a reception buffer that stores received data cells, and a data monitor that monitors the arrival status of data cells and calculates the cycle at which the data terminal changes the transmission rate And a circuit.

The RM cell processing circuit of the ATM traffic control device according to the present invention monitors the arrival state of the backward RM cell and detects the absence of the backward RM cell.
It is characterized by transmitting RM cells spontaneously.

The RM cell processing circuit of the ATM traffic control device according to the present invention monitors the arrival status of the data connection in the data connection, and the data ATM terminal
It is characterized in that a transmission rate change cycle and a change rate are obtained when M cells are lost.

The rate calculation circuit of the ATM traffic control device according to the present invention is characterized in that a prediction coefficient for calculating the number of voice cells arriving in the next cycle is automatically corrected from the voice cell arrival status in a plurality of voice connections. .

The rate calculation circuit of the ATM traffic control device according to the present invention includes a buffer that separates and stores voice cells and data cells, and performs data traffic based on the storage state of the data cells and the arrival state of voice cells in a plurality of voice connections. Is determined.

An ATM traffic control method according to the present invention includes a plurality of voice connections for transferring voice information communicated between voice ATM terminals using voice cells and a data cell and data traffic control for data information communicated between data ATM terminals. ATM (Asynchronous) that accommodates data connections transferred using cells (hereinafter referred to as RM cells) on the same ATM line
Transfer mode) In the ATM traffic control method provided in the multiplex transmission method, the arrival status of the voice cells in the plurality of voice connections transmitted from the voice ATM terminal is monitored at predetermined intervals, and the arrival voice cells of the next period are monitored. A transmission rate determining step of predicting the number and determining a data traffic transmission rate; and a transmission rate of receiving a data traffic control cell from an ATM line, setting the transmission rate in the data traffic control cell, and transmitting the data to a data ATM terminal. And a changing step.

The ATM traffic control method according to the present invention comprises a data ATM
A transmission buffer step of receiving and storing data cells from the terminal and voice cells from the voice ATM terminal, a transmission step of transmitting cells in the transmission buffer step, and a prediction coefficient based on the number of voice connections connected simultaneously. Rate calculating step of calculating a transferable rate based on the prediction coefficient and the number of arriving voice cells, and an RM cell including a transfer rate designation value for designating a transfer rate to a data ATM terminal on the transmission side. An RM cell processing step of processing the RM cell, a receiving step of receiving the cell, and a receiving buffer step of storing the received data cell, wherein the RM cell processing step is performed based on a transfer rate designation value included in the RM cell. Also, if the value of the transferable rate from the rate calculation step is small, the transfer rate designation value included in the RM cell is changed to the value of the transferable rate from the rate calculation step. And wherein the changing trees.

In the rate calculation step of the ATM traffic control method according to the present invention, it is determined whether or not the voice cell is used as voice band data, and the voice cell having voice information and the voice cell of voice band data individually arrive. It is characterized in that the number of arriving voice cells in the next cycle is predicted based on the result of monitoring the situation and the transmission rate of data traffic is determined.

The ATM traffic control method according to the present invention comprises a data ATM
A transmission buffer step of receiving and storing data cells from the terminal and voice cells from the voice ATM terminal; a transmission step of transmitting cells in the transmission buffer step; monitoring signaling information, and simultaneously connecting based on the signaling information A signaling monitor step of creating the number of simultaneous voice connections (hereinafter referred to as the number of simultaneous connections); obtaining a prediction coefficient based on the number of simultaneous connections; A rate calculating step of calculating a transferable rate of the RM cell; a RM cell processing step of processing an RM cell including a transfer rate designation value designating a transfer rate to the data ATM terminal on the transmitting side; and a receiving step of receiving the cell. And a receiving buffer step of storing received data cells.

The rate calculation step of the ATM traffic control method according to the present invention is characterized in that when the number of simultaneous voice connections exceeds a prescribed value, the arrival state of the next cycle voice cell is predicted based on the number of simultaneous connections. .

The rate calculation step of the ATM traffic control method according to the present invention is characterized in that the number of cells arriving in this cycle is predicted from the cycle at which the data ATM terminal changes the transmission rate and the arrival status of voice cells.

The ATM traffic control method according to the present invention comprises a data ATM
A transmission buffer step of receiving and storing data cells from the terminal and voice cells from the voice ATM terminal, a transmission step of transmitting cells in the transmission buffer step, and a prediction coefficient based on the number of voice connections connected simultaneously. And a rate calculating step of calculating its own transferable rate based on the prediction coefficient and the number of arriving voice cells, and a transfer rate designation value for designating the transfer rate to the data ATM terminal on the transmission side. An RM cell processing step for processing RM cells, a receiving step for receiving cells, a receiving buffer step for storing received data cells, and monitoring of data cell arrival status to calculate a period at which a data terminal changes a transmission rate by monitoring a data cell arrival state. And a data monitoring step.

The RM cell processing step of the ATM traffic control method according to the present invention includes a step of monitoring the arrival state of the backward RM cell and detecting the backward RM cell when the backward RM cell is lost.
The cell is spontaneously transmitted.

In the RM cell processing step of the ATM traffic control method according to the present invention, the arrival state of the data connection in the data connection is monitored, and the data ATM terminal
It is characterized in that a transmission rate change cycle and a change rate are obtained when M cells are lost.

The rate calculation step of the ATM traffic control method according to the present invention is characterized in that a prediction coefficient for calculating the number of arriving voice cells in the next cycle is automatically corrected from the arrival state of voice cells in a plurality of voice connections. .

The rate calculation step of the ATM traffic control method according to the present invention includes a buffer step of separating and storing voice cells and data cells, and based on the storage state of the data cells and the arrival state of voice cells in a plurality of voice connections. The transmission rate of traffic is determined.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram showing an embodiment of an ATM traffic control device according to the present invention.

FIG. 2 is a flowchart showing the operation of the rate calculation circuit A101 shown in FIG.

FIG. 3 is a VCI analysis table configuration diagram showing a configuration example of the VCI analysis table shown in the flowchart of FIG.

FIG. 4 is a prediction coefficient table configuration diagram showing a configuration example of the prediction coefficient table shown in the flowchart of FIG.

FIG. 5 is a flowchart showing the operation of the RM cell processing circuit A shown in FIG.

FIG. 6 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

FIG. 7 is a flowchart illustrating the operation of the rate calculation circuit B601 shown in FIG.

FIG. 8 is a voice cell structure diagram showing an example of the format of the voice cell used in the flowchart shown in FIG.

FIG. 9 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

FIG. 10 is a flowchart showing the operation of the signaling monitor circuit shown in FIG.

FIG. 11 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

FIG. 12 is a flowchart for explaining the operation of the rate calculation circuit C shown in FIG.

FIG. 13 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

FIG. 14 is a flowchart for explaining the operation of the rate calculation circuit D1103 shown in FIG.

FIG. 15 is a prediction coefficient table configuration diagram showing a configuration example of the prediction coefficient table appearing in the flowchart shown in FIG.

FIG. 16 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

FIG. 17 is a flowchart illustrating the operation of data monitor circuit 1601 shown in FIG.

FIG. 18 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

FIG. 19 is a flowchart showing an operation of the RM cell processing circuit B1801 shown in FIG. 18 when a cell is received from an ATM terminal.

FIG. 20 shows the state shown in FIG. 18 when an RM cell is received from the circuit.
FIG. 18 is a flowchart showing the operation of the RM cell processing circuit B1801.

FIG. 21 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

FIG. 22 is a flowchart showing an operation of the RM cell processing circuit C2101 shown in FIG. 21 when a cell is received from an ATM terminal.

FIG. 23 shows a case where a cell is received from a wide area ATM line.
FIG. 21 is a flowchart showing the operation of the RM cell processing circuit C2101 shown in FIG.

FIG. 24 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

FIG. 25 is a flowchart showing an operation of the rate calculation circuit E2401 shown in FIG.

FIG. 26 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

FIG. 27 is a flowchart showing an operation of the rate calculation circuit F1001 shown in FIG.

FIG. 28 is a cell structure diagram showing a configuration of the present invention and a conventional ATM cell.

FIG. 29 is a network configuration diagram showing a configuration example of the present invention and a conventional voice / data integrated network.

FIG. 30 is a configuration diagram showing a configuration of a conventional multiplex transmission unit 2910.

FIG. 31 is a sequence diagram illustrating a method of adjusting a transmission rate according to the present invention and a conventional method.

FIG. 32 is a sequence diagram showing an adjustment sequence when the backward RM cell of the present invention and the conventional RM cell are not transmitted to the transmission side for some reason.

FIG. 33 is an RM cell structure diagram showing a format of an RM cell used in a transmission rate adjusting method of the present invention and a conventional data terminal.

FIG. 34 is a network configuration diagram showing a configuration example of an integrated voice / data network of the present invention.

 FIG. 35 is an explanatory diagram of the operation of the present invention.

FIG. 36 is a network configuration diagram showing a configuration example of the integrated voice / data network of the present invention.

 FIG. 37 is an explanatory diagram of the operation of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is a configuration diagram showing an embodiment of an ATM traffic control device according to the present invention.

In the figure, 100 is a multiplex transmission unit which is an ATM traffic control device according to the present invention, 101 is a rate calculation circuit A, 102 is a transmission buffer, 103 is an RM cell processing circuit A, 104 is a reception circuit A, and 105 is a reception buffer. is there. 198 is a transmission rate determination unit, and 199 is a transmission rate change unit.

FIG. 2 is a flowchart showing the operation of the rate calculation circuit A101 shown in FIG. 1, and FIG. 3 is a VCI analysis table configuration diagram showing a configuration example of the VCI analysis table shown in the flowchart of FIG. FIG. 4 is a prediction coefficient table configuration diagram showing a configuration example of the prediction coefficient table shown in the flowchart of FIG.

FIG. 5 is a flowchart showing the operation of the RM cell processing circuit A shown in FIG.

FIG. 34 is a diagram showing a configuration example of a voice data integration network of this embodiment.

In FIG. 34, D1 indicates a data ATM terminal. V1 to V3 indicate voice ATM terminals. Therefore, in FIG. 34, the number of voice connections is three, and the number of data connections is one.
Becomes

 FIG. 35 is an operation explanatory diagram.

28, 29, and 33 are also used in the description of the present invention.

Hereinafter, the traffic control method of the present invention will be described with reference to the drawings.

Data-based ATM line termination 2908 or voice-based ATM line termination
The cells received by 2909 are stored in the transmission buffer 102 and input to the rate calculation circuit A101. In the rate calculation circuit A101, the cell received from the terminal side
VC in cell header 2802 in cell format shown in
Using I, the VCI analysis table shown in FIG. 3 is indexed and connection information is obtained (step S201) to determine whether the information is audio information (step S202).
The counter C in the rate calculation circuit A101 is incremented (step S203).

FIG. 35 shows a case where three voice ATM terminals 2904 output two voice cells at a voice cellization period T1 and three voice cells at a voice cellization period T2. Also, the case where the value of the counter C is 2 after the cellization period T1 of the voice is shown.

The rate calculation circuit A101 has a circuit that is started in a fixed cycle (speech cell cycle T). This circuit uses a preset value, the number of simultaneous connections for voice cells (shown in FIG. 34).
In the exchange 3401 in the ATM switching network 2902, it means the number of voice ATM terminal pairs connected simultaneously for voice connection. In FIG. 34, based on M = 3), a prediction coefficient is obtained by indexing the prediction coefficient table shown in FIG. 4 (step S204). An estimated value (hereinafter, referred to as n) of the number of arriving voice cells is obtained (step S205).

Next, as shown in the following equation, the maximum transmission cell rate R of the wide area ATM line 2907 including both the transmission cell rate of the voice cell (hereinafter also referred to as the transmission rate) and the transmission cell rate of the data cell.
By subtracting the transmission cell rate n / T (cell / second) of the voice cell from (cell / second), the transmission cell rate of the data cell is calculated, and the specified rate (the value is output as the rate output value R1 or simply the rate specification) In the following, the output to the RM cell processing circuit A103 is updated, and the counter is reset (steps S206 and S207).

Rate output value R1 (cell / second) = R−n / T (where R is the maximum transmission cell rate of the wide area ATM line 2907) If the prediction coefficient is 1, in the case of FIG. Counter value × prediction coefficient = 2 × 1 = 2.

Further, assuming that T = 1 second and R = 8 cells / second, the rate output value R1 = R−n / T = 8−2 / 1 = 6, and the rate output value R1 = 6 cells / second. The rate output value R1 indicates the free line capacity of the wide area ATM line 2907. When the prediction coefficient is 1, it means that the number of arriving voice cells in the current cycle is predicted as it is as the number of arriving voice cells in the next cycle.

The RM cell processing circuit A103 operates independently of the rate calculation circuit A101 except that the output of the specified rate is referred to. The receiving circuit A104 receives A from the wide area ATM line 2907.
To determine whether the TM cell is an RM cell, the type of the cell header 2802 shown in FIG. 28 is analyzed. That is, the receiving circuit A104
Is the PT (Payload T) in the cell header 2802 shown in FIG.
If the value of “ype: used for displaying the information type” is 6 as shown in FIG. 33, it is determined that the ATM cell is an RM cell, and
If it is a cell, it is input to the RM cell processing circuit A103. If it is not a RM cell, it is stored in the reception buffer 105. Receive buffer 1
The ATM cells stored in 05 are then transferred to the data ATM line termination unit 2908 or the voice ATM line termination unit 2909.

Next, the operation of the RM cell processing circuit A103 will be described with reference to the flowchart shown in FIG.

The RM cell processing circuit A103 receives the RM
The cell transfer rate specification value 3304 is taken out (step S50).
1), the rate specification value indicated by the rate calculation circuit A101 is the above RM
If it is smaller than the cell transfer rate specification value 3304 (step
S502), the transfer rate designated value is replaced with this rate designated value (step S503), and if it is not small, it is transferred to the receiving buffer 105 without change, and transmitted to the data ATM line termination unit 2908 like other cells. (Step S504). Data ATM terminal 2
The 903 receives the RM cell, and changes the transmission rate to the RM cell transfer rate designation value 3304. In this embodiment, as shown in FIG. 34, since the number of data connections is 1, the transfer rate specification value is directly specified as the transfer rate specification value 3304 of the RM cell, but if the number of data connections is 2 In the above case, a value obtained by equally dividing the rate specification value indicated by the rate calculation circuit A101 by the number of data connections or a value proportionally distributed by the transmission cell speed of each data connection is specified as the RM cell transfer rate specification value 3304. .

In this embodiment, the rate calculation circuit A101
Predict the number of voice cell arrival cells in the next cycle based on the result of observing the number of voice cells in a plurality of voice connections arriving from the M terminal via the voice ATM line termination unit 2909,
The predicted value and a transmission rate at which each node such as an ATM multiplex transmission device or an ATM switching network can transfer is obtained. RM cell processing circuit A1
03 sets a transfer rate at which data can be transferred when a data traffic control cell (RM cell) is relayed, and notifies the data ATM terminal via the data ATM line termination unit 2908 of the transfer rate at which data can be transferred. Thereby, the transmission rate of the data ATM terminal is adjusted in accordance with the state of use of the line by the voice connection.

According to this embodiment, the ATM traffic control device predicts the free channel capacity based on the arrival state of the voice cell, and suppresses the transmission rate to the transmission rate corresponding to the predicted free channel capacity. There is an effect that good multiplex transmission can be provided.

Embodiment 2 FIG. 6 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

6, the same reference numerals as those in FIG. 1 denote the same or corresponding parts as in FIG. Reference numeral 601 denotes a rate calculation circuit B. The present invention
In the invention described in the first embodiment, the operation of the rate calculation circuit is different.

FIG. 7 is a flowchart for explaining the operation of the rate calculation circuit B601 shown in FIG.

FIG. 8 is a voice cell structure diagram showing an example of a format of a voice cell used in the flowchart shown in FIG.

In FIG. 8, reference numeral 801 denotes a cell, 802 denotes a cell header, 803 denotes a cell information section, and 804 denotes voice information for identifying whether a voice cell provided in the cell information section 803 is a FAX cell (a FAX cell is also a type of voice cell). Identification.

In FIG. 36, VF indicates a voice ATM terminal that converts facsimile data into voice band information and transfers the information. Figure 37
As shown in (1), during the voice connection, the voice ATM terminal VF always generates and transmits one FAX cell for each voice cell period T. V1 and V2 indicate voice ATM terminals that transfer voice information. As shown in FIG. 37, the voice ATM terminals V1 and V2 generate and transmit at most one voice cell in each voice cell cycle T.

28, 29, and 33 are also used in the description of the present invention.

Next, the operation of the rate calculation circuit B601 shown in FIG.
This will be described with reference to FIG.

In the rate calculation circuit B601, the cell header in the cell format shown in FIG.
Using the VCI in 2802, the VCI analysis table shown in FIG. 3 is indexed to obtain connection information (step S701).
The rate calculation circuit B601 determines whether or not the received cell is a voice cell based on the connection information (step S702). If the result of the determination is a voice cell, the rate calculation circuit B601 further uses the identification information section in the voice cell format shown in FIG. It is determined whether or not the information (voice cell) is voice band information (FAX cell) (step S703). If the result of the determination is that the information is voice information (voice cell), the counter 1C1 is incremented (step S703).
704), counter 2C for voice band information (fax cell)
2 is incremented (step S705).

The rate calculation circuit B601 has a circuit that is started at a fixed period (T). This circuit has a preset number of simultaneous connections M for voice cells (for voice cells and fax
Number of connections for voice connection, including both for cells. Figure 36
, M = 3), the number of simultaneous connections M for voice cells (in FIG. 36, M) is a value obtained by subtracting the value m of the counter 2 (the number of connections for the FAX cell; 1 in FIG. 36). M = 3-1 =
2 is obtained by indexing the prediction coefficient table shown in FIG. 4 (step S711), and this prediction coefficient is multiplied by the number of currently arriving voice cells which is the value of the counter 1. Thus, the estimated value n of the number of arriving voice cells in the next cycle is obtained (step S712). The reason why the value m of the counter 2 is subtracted is to estimate the arrival of only the voice cell in the next cycle. Next, the designated rate of the data cell is calculated by the following equation, the output to the RM cell processing circuit A103 is updated as the rate output value R1 (step S713), and the counter 1C1 and the counter 2C2 are reset (step S714).

Rate output value R1 = R- (n + m) / T (where m means the counter value of counter 2C2) The reason for adding the value m of the counter 2 to the estimated value n is FA
This is because the X cell is always transferred every period during the connection.

According to this embodiment, the ATM traffic control device identifies the information content of the voice cell data, and the traffic characteristics in the case of voice band data (that is, the characteristics that the FAX cell is always transferred every period). Is performed in consideration of the above, so that there is an effect that multiplex transmission with good cell discard characteristics can be provided without restricting the method of using the voice connection.

Embodiment 3 FIG. 9 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts as in FIG. Reference numeral 901 denotes a signaling monitor circuit. The present invention is different from the first and second embodiments in that the signaling monitor circuit 901 automatically obtains the number M of simultaneous connections which is a preset value.

In FIG. 9, cells received from the data ATM line termination unit 2908 or voice ATM line termination unit 2909 and from the wide area ATM line 2907 are input to the signaling monitor circuit 901. The number M of simultaneous connections calculated by the signaling monitor circuit 901 is input to the rate calculation circuit A101.

FIG. 10 is a flowchart showing the operation of the signaling monitor circuit shown in FIG.

28, 29, and 33 are also used in the description of the present invention.

Next, the operation of the signaling monitor circuit shown in FIG.
This will be described according to the flowchart shown in FIG.

The signaling monitor circuit 901 extracts the VCI in the cell header 2802 shown in FIG. 28 of the cell received from the data-based ATM line termination unit 2908 or the voice-based ATM line termination unit 2909 and from the wide area ATM line 2907, and indexes the VCI analysis table. The connection information is obtained (step S1001). Next, it is determined whether or not the connection information is signaling information based on the specific value (step S1002). If the connection information is signaling information, it is determined whether or not the information in the VCI is a call setup (step S1003). If the call setup is a call setup, the simultaneous connection number counter C3 is incremented.
In the case of disconnection, the simultaneous connection number counter C is decremented, and the input value to the rate calculation circuit A101 is updated.

According to this embodiment, the ATM traffic control device detects the set number of voice connections and performs traffic prediction based on the detected number, so that efficient multiplexing can be performed in response to a change in the set number of voice connections. This has the effect of enabling transmission.

Embodiment 4 FIG. 11 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

9, the same reference numerals as those in FIG. 9 denote the same or corresponding parts as in FIG. Reference numeral 1100 denotes a multiplex transmission unit which is an ATM traffic control device, and 1101 denotes a rate calculation circuit C. The present invention is characterized in that, in the operation of the rate calculation circuit A according to the third embodiment, when the number of simultaneous connections exceeds a certain value, the rate is calculated not by the counter value of the number of cells but by a value determined only by the number of simultaneous connections. Are different.

FIG. 12 is a flowchart for explaining the operation of the rate calculation circuit C1101 shown in FIG.

28, 29, and 33 are also used in the description of the present invention.

Next, the operation of the rate calculation circuit C1101 shown in FIG.
This will be described with reference to the flowchart shown in FIG.

When the rate calculation circuit C1101 receives a cell from the terminal side as in the third embodiment, the VCI in the cell header shown in FIG. 28 is used to look up the VCI analysis table shown in FIG. 3 to obtain connection information (step S1201). Thus, it is determined whether the information is audio information (step S1202).

If the result of the determination is a voice, it is determined whether or not the counter exceeds a specified upper limit (for example, 10) (step S120).
3) If the value does not exceed the specified upper limit (10), the counter C
Is incremented (step S1204). At this time,
It does not update if it has already reached the specified value (10). Then, it is determined whether or not the number of simultaneous connections M input from the signaling monitor circuit 901 in units of the cycle (T) is equal to or greater than the specified value (10) (step S1211).
A rate output value of the data cell based on the number M of simultaneous connections is obtained by the following equation (step S1212).

Rate output value R1 = R- (M * constant coefficient) / T When the number of simultaneous connections M is a large value (for example, a specified value of 10 or more), it is statistically determined how much the voice cells are transferred. Can be calculated. For example, if 80% of voice ATM terminals generate voice cells, a constant coefficient of 0.8
And it is sufficient. When the number M of simultaneous connections is a small value, it is difficult to apply a statistical calculation, and thus a constant coefficient is not used.

That is, if the simultaneous connection number M is equal to or less than the specified value, the prediction coefficient table is indexed from the prediction coefficient table of the next cycle arriving voice cell shown in FIG. Is obtained (step S1213), the estimated value n of the number of arriving voice cells in the next cycle is obtained by multiplying the prediction coefficient by the counter value (step S1214), and the rate output value is calculated by the following equation (step S1215). Next, the counter C is cleared (step S1216).

Rate output value R1 = R−n / T According to this embodiment, when the set number of voice connections exceeds a specified value, the ATM traffic control device performs traffic prediction based on the set number. Therefore, it is possible to suppress the capacity of the counter for counting the number of arriving cells, and to provide more economical multiplex transmission.

Fifth Embodiment FIG. 13 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts as in FIG. Reference numeral 1300 denotes a multiplex transmission unit which is an ATM traffic control device, and 1301 denotes a rate calculation circuit D. The present invention is different from the first embodiment in that the time interval to be predicted is set to the cell period T of the voice, whereas the data ATM terminal 2
903 uses a period Td which is a period for changing the transmission rate. As shown in FIG. 31 or FIG. 32, the cycle Td is determined by the rate at which the transmission rate change interval of the data terminal transmits the RM cell (Nrm: in this embodiment, Nrm is preset). Just because
Dynamically fluctuates due to fluctuations in the transmission rate. In this embodiment, means for estimating the period Td is added to the rate calculation circuit D1301.

FIG. 14 is a flowchart for explaining the operation of the rate calculation circuit D1301 shown in FIG.

FIG. 15 is a prediction coefficient table configuration diagram showing a configuration example of the prediction coefficient table appearing in the flowchart shown in FIG.

28, 29, and 33 are also used in the description of the present invention.

Next, the operation of the rate calculation circuit D1301 shown in FIG.
This will be described with reference to the flowchart shown in FIG.

When receiving a cell from the terminal side as in the first embodiment, the rate calculation circuit D1301 extracts the VCI in the cell header 2802 shown in FIG. 28, and obtains connection information by indexing the VCI analysis table shown in FIG. 3 ( Step S1401). next,
It is determined whether or not the connection information is voice information (step S1402).
Is incremented (step S1403). Then, the rate Nrm at which the RM cell is transmitted for each period (T) and the received RM
Based on the current rate value obtained from the cell transfer rate specification value 3304, a cycle Td based on the cycle Td = Nrm / current rate value is calculated (step S1411), and the obtained cycle Td and the simultaneous Based on the number M of connections, the prediction coefficient table of the next cycle arrival voice cell shown in FIG. 15 is indexed to read out the prediction coefficient (step S1412), and the obtained prediction coefficient is multiplied by the counter value of the voice cell, thereby obtaining An estimated value n of the number of arriving voice cells in the next cycle is obtained (step S1).
413).

Next, based on the estimated value n of the number of arriving voice cells and the cycle Td calculated in step S1411, the voice rate is calculated by the following equation, and the wide area including the voice cell rate and the data cell rate is calculated.
By subtracting the voice rate from the maximum transmission cell rate R of the ATM line, the output to the RM cell processing circuit is updated using the data cell rate as a rate output value (step S1).
414) and reset the counter C (step S
1415).

Rate output value R1 = R−n / Td According to the present embodiment, the ATM traffic control device uses the period Td for changing the transmission rate of the terminal in the data connection as a unit, and the available line capacity based on the arrival state of the voice cell data. Is predicted, and the transmission rate can be suppressed to a value corresponding to the prediction. Therefore, it is possible to provide multiplex transmission with better cell discard characteristics.

Embodiment 6 FIG. 16 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

13, the same reference numerals as in FIG. 13 indicate the same or corresponding parts as in FIG. 1600 is a multiplex transmission unit which is an ATM traffic control device, 1601 monitors the data cell transmission status and
Is a data monitor circuit that automatically calculates In the present invention, while Nrm is a preset value in the fifth embodiment, the data monitor circuit 1601 monitors the transmission status of the data cells and automatically calculates the RAM cell transmission ratio Nrm. The points are different.

FIG. 17 is a flowchart illustrating the operation of the data monitor circuit 1601 shown in FIG.

28, 29, and 33 are also used in the description of the present invention.

Next, the operation of the data monitor circuit 1601 shown in FIG.
This will be described with reference to the flowchart shown in FIG.

Cells received from the data ATM terminal 2903 and the voice ATM terminal 2904 are input to the data monitor circuit 1601. The data monitor circuit 1601 extracts connection information by indexing the VCI analysis table shown in FIG. 3 using the VCI in the cell header shown in FIG. 28, and determines whether or not this connection is a data connection (step S1701). If the result of the determination is that the connection is a data connection, the PT in the cell header shown in FIG. 28 is checked to determine whether it is a data cell or an RM cell (step S1702). If the result of the determination is that the cell is a data cell, the counter C4 is incremented (step S170).
3) In the case of RM cell (PT = 6 as shown in FIG. 33),
The counter value of the counter C4 is set to the rate Nrm for transmitting RM cells, and output to the rate calculation circuit D1301 (step S
1704), and clear the counter C4 (step S1).
705).

According to this embodiment, the ATM traffic control device automatically determines the cycle Td for changing the transmission rate of the terminal in the data connection, instead of a fixed value set in advance. This has the effect of providing multiplex transmission with good cell discard characteristics.

Embodiment 7 FIG. 18 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts as in FIG. Reference numeral 1800 denotes a multiplex transmission unit which is an ATM traffic control device, and reference numeral 1801 denotes an RM cell processing circuit B. The present invention is different from the above embodiments in that a circuit for monitoring the backward RM cell loss and automatically transmitting the RM cell is provided in the RM cell processing circuit B1801.

FIG. 19 is a flowchart showing an operation of the RM cell processing circuit B1801 shown in FIG. 18 when a cell is received from an ATM terminal.

FIG. 20 shows a case where an RM cell is received from the line.
48 is a flowchart showing the operation of the RM cell processing circuit B1801 shown in FIG.

28, 29, and 33 are also used in the description of the present invention.

Next, the operation of the RM cell processing circuit B1801 shown in FIG.
And the flowchart shown in FIG.

Data-based ATM line termination 2908 or voice-based ATM line termination
The cell received from the 2909 and the RM cell received from the wide area ATM line 2907 are both input to the RM cell processing circuit B1801. RM cell processing circuit B1801 that received cells from ATM terminals
Obtains connection information by indexing the VCI analysis table shown in FIG. 3 using the VCI in the cell header 2802 shown in FIG. 28, and determines whether or not the connection is a data connection (step S1901).

Furthermore, if the result of the judgment is
It is determined whether it is a data cell or an RM cell by looking at the PT of the RM cell shown in 33 in the header 3302 (step S1902). If the result of the determination is that the cell is an RM cell, the counter C5 for the RM cell is incremented (step S1903). Then, the counter C5 for the RM cell has a preset value (the specified number of times Cr shown in FIG. 32).
m) It is checked whether it is larger than (step S1904), and when it becomes larger, another preset value (Cdf: Cutoff decrease)
factor) multiplied by the current rate value is the rate calculation circuit
It is determined whether or not the value exceeds the specified rate specified by A101 (step S1905). If so, the specified rate from the rate calculation circuit A101 is set to the specified transfer rate 3304 and the RM cell is received. The data is transferred to the buffer 105 and transmitted to the data ATM line termination unit 2908 as in the other cells (step S1906).

On the other hand, the RM cell processing circuit B1801
If an RM cell has been received, the counter RM for the RM cell is cleared (step S2001).

Subsequent operations are the same as in the first embodiment. That is, the transfer rate specification value of the received RM cell is extracted (step S2).
002) Thereafter, it is checked whether or not the specified rate value from the rate calculation circuit A101 is smaller than the specified rate value indicated by the specified transfer rate value of the received RM cell (step S2003). The specified value is replaced with the specified value from the rate calculation circuit A101 (step S2004). If the specified value is large, the data is transferred to the receiving buffer 105 without any change, and the data ATM line termination unit 2908 is used as in the other cells. (Step S2005).

According to this embodiment, since the ATM traffic control device automatically transmits an RM cell when a backward RM cell is lost, even in a situation where a backward RM cell is lost, the terminal automatically adjusts the transmission rate. When the transmission rate to be changed exceeds the estimated free line capacity based on the arrival state of voice cell data, this can be corrected, and the cell discard characteristic can be further improved. There is an effect that a good multiplex transmission device can be provided.

Embodiment 8 FIG. 21 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

In the figure, the same reference numerals as in FIG. 18 indicate the same or corresponding parts as in FIG. Reference numeral 2100 denotes a multiplex transmission unit which is an ATM traffic control device, and 2101 denotes an RM cell processing circuit C. The present invention provides a method according to the seventh embodiment, wherein the Crm and Cdf (Cdf: Cutoff decrease) are used.
The factor is that the RM cell processing circuit C2101 is provided with a circuit that monitors the data transmission status of the data terminal and automatically obtains the values of Crm and Cdf. Hereinafter, Crm and Cdf will be referred to as parameters.

FIG. 22 is a flowchart showing an operation of the RM cell processing circuit C2101 shown in FIG. 21 when a cell is received from an ATM terminal.

FIG. 23 is a flowchart showing an operation of the RM cell processing circuit C2101 shown in FIG. 21 when a cell is received from a wide area ATM line.

28, 29, and 33 are also used in the description of the present invention.

Next, the operation of the RM cell processing circuit C2101 shown in FIG.
This will be described with reference to the flowchart of FIG.

Data-based ATM line termination 2908 or voice-based ATM line termination
The cell received from the 2909 and the RM cell received from the wide area ATM line 2907 are both input to the RM cell processing circuit C2101. The RM cell processing circuit C2101 that has received the cell from the terminal,
The VCI in the cell header 2802 shown in FIG. 28 is used to read the connection information by indexing the VCI analysis table shown in FIG. 3 to determine whether this connection is a data connection (step S2201).

Furthermore, if the result of the judgment is
Looking at PT in cell header 2802 shown in 28, it is a data cell
It is determined whether the cell is an RM cell (step S2202). As a result of the judgment, R
In the case of the M cell, the counter C5 is incremented (step S2203). Subsequent operations differ between the parameter derivation phase and the parameter derivation phase. In the phase after parameter derivation, as in the seventh embodiment, when the counter matches Crm (step S2205), a value obtained by multiplying Cdf by the current rate value is a value smaller than the specified rate specified by the rate calculation circuit A101. If there is (Step S220
6) The RM cell in which the transfer rate specification value is set is transferred to the reception buffer 18 and transmitted to the data ATM line termination unit 11 like other cells (step S2207).

In the case of the parameter derivation phase (step S2205),
The interval time (t) between the RM cells is obtained from the difference between the current time and the previous value stored at the time of receiving the previous RM cell (step S2209). Next, by comparison with the previously stored interval value (f previous value) (step S2210),
It is determined that the transmission rate has been changed, and if the counter C5 at this time is not 1, the counter value of the counter C5 is set as Crm, and the current interval time (t) is set to the previous interval value (t previous value). The interval ratio (t / t previous value) obtained as a result of the division is set as Cdf, and the phase is set as a phase after deriving parameters (step S2211).

If the change of the transmission rate is not determined, the current time is stored in the previous time value and the interval value is stored in the previous time value t (step S2212). Line to R
The operation when an M cell is received is the same as in the seventh embodiment. That is, the counter is cleared (step S2301).
Thereafter, the transfer rate designated value indicated in the received RM cell is extracted (step S2302). If the rate designated value from the rate calculation circuit A is smaller than the transfer rate designated value indicated in the received RM cell (step S2303), the transfer is performed. The designated rate value is replaced with the designated rate value from the calculation circuit A (step S230)
4) If it is large, transfer it to receive buffer 18 without change,
The data is transmitted to the data ATM line termination unit 2908 as in the other cells (step S2305).

According to this embodiment, the ATM traffic control device is configured to automatically change the transmission rate of the terminal when the backward RM cell is lost (interval time t).
And the change rate (previous value of the interval time t / t), the parameters Crm and Cdf can be automatically detected by monitoring the data arrival status instead of the fixed values set in advance. There is an effect that a multiplex transmission device having better cell discarding characteristics can be achieved with a device having better maintainability.

Embodiment 9 FIG. 24 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts as in FIG. Reference numeral 2400 denotes a multiplex transmission unit which is an ATM traffic control device, and 2401 denotes a rate calculation circuit E. According to the present invention, in the above-described embodiments, the rate calculation is performed using a prediction coefficient which is set in advance as the characteristics of the voice are known in advance. A circuit that automatically corrects the prediction coefficient is a rate calculation circuit E240
It is characterized by preparing for 1.

FIG. 25 is a flowchart showing the operation of the rate calculation circuit E2401 shown in FIG.

28, 29, and 33 are also used in the description of the present invention.

Next, the operation of the rate calculation circuit E2401 shown in FIG.
This will be described with reference to the flowchart shown in FIG.

The rate calculation circuit E2401 provides a cell header in the cell format shown in FIG. 28 for the cell received from the terminal side.
The connection information is obtained by indexing the VCI analysis table shown in FIG. 3 using the VCI in the 2802 (step S2).
501). It is determined whether or not the connection information is audio information (step S2502). If the connection information is audio, the counter C is incremented (step S2503).

Further, the relay calculation circuit E2401 has a circuit that is started at a fixed cycle (T). This circuit first checks whether the difference between the current counter value of the counter and the estimated value (n stored value) in the previous cycle exceeds a specified value (step S2511). It is determined that the error is large, and the prediction coefficient table is changed using the ratio of the current counter storage value to the previous counter storage value as a new prediction coefficient (step
S2512). Subsequent operations are the same as those of the rate calculation circuit A101 according to the first embodiment.
By multiplying the counter value by a prediction coefficient obtained by indexing the prediction coefficient table shown in (1), an estimated value n of the number of arriving voice cells in the next cycle is obtained.

On the other hand, the value estimated in the previous cycle is stored, then the rate is calculated by the following equation, and the output to the RM cell processing circuit is updated (step S2513).

Rate output value R1 = R-n / T Finally, the counter value and the predicted value are stored for use in the determination of the next cycle, and the counter C is reset (step S2514).

According to this embodiment, the ATM traffic control device corrects the prediction method based on the arrival state of voice cells by comparing it with the number of cells that have actually arrived, so that strict adjustment of parameters is not required. In addition, it is possible to provide multiplex transmission with good cell discard characteristics by using a device having better maintainability.

Embodiment 10 FIG. 26 is a configuration diagram showing another embodiment of the ATM traffic control device according to the present invention.

In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts as in FIG. 2600 is a multiplex transmission unit which is an ATM traffic control device, 2601 is a rate calculation circuit F, 2602 is a voice / data identification unit, 2603 is a data cell transmission buffer for temporarily storing data cells when transmitting, and 2604 is a voice cell transmission buffer. This is a voice cell transmission buffer that is temporarily stored when transmitting. According to the present invention, the transmission buffer is shared by voice and data in the above-described embodiments, but the data terminal buffer and the voice buffer are separated, and the data buffer remains. It is characterized by providing a circuit for calculating the rate based on the amount in the rate calculating circuit F2601.

FIG. 27 is a flowchart showing the operation of the rate calculation circuit F2601 shown in FIG.

28, 29, and 33 are also used in the description of the present invention.

Next, the operation of the rate calculation circuit F2601 shown in FIG.
This will be described with reference to the flowchart shown in FIG.

The rate calculation circuit F2601 is a cell header in the cell format shown in FIG. 28 for the cell received from the ATM terminal.
The connection information is extracted by indexing the VCI analysis table shown in FIG. 3 using the VCI in the 2802 (step S2701), and it is determined whether or not the connection information is audio information (step S2702). In the case of audio information, the counter C is incremented (step S270).
3).

Further, the rate calculation circuit F2601 has a circuit started at a fixed period (T). This circuit obtains a prediction coefficient by indexing the prediction coefficient table shown in FIG. (Step S2711) By multiplying this prediction coefficient by the voice cell counter obtained in step S2703, the estimated value n of the number of arriving voice cells in the next cycle is obtained.
Is obtained (step S2712).

Next, the rate output value R1 is calculated by the following equation using the estimated value n, the number of cells waiting for transmission (hereinafter referred to as m1) indicating the use state of the data cell transmission buffer 2603, and the number of empty buffers (hereinafter referred to as m2). Then, the output is updated to the RM cell processing circuit A103 (step S2713), and the counter is reset (step S2714).

Rate output value R1 = R− (n + m1−m2) / T According to this embodiment, the ATM traffic control device includes a buffer dedicated to the data cell, and uses the free line based on the use state and the arrival state of the voice cell data. The transmission rate is determined by the capacity, and the transmission rate is suppressed to the transmission rate corresponding to the available line capacity, so that when a prediction error occurs, it can be absorbed by the buffer, so that a multiplex transmission apparatus with better cell discard characteristics is provided. It has the effect of being able to.

INDUSTRIAL APPLICABILITY As described above, the ATM traffic control device and method of the present invention predict an available line capacity based on the arrival status of voice cell data, and set the transmission rate to a transmission rate corresponding to the available line capacity. Since the suppression is performed, there is an effect that multiplex transmission having a good cell discard characteristic can be provided.

As described above, the present invention provides an ATM multiplex transmission apparatus that outputs a plurality of connections for transferring voice information and a connection for transferring data information at the same output port, and satisfies voice quality and discards data cells. An ATM traffic control apparatus and method for suppressing a rate to an appropriate value are economically realized.

Continuation of the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04L 12/54 H04L 12/58 H04J 3/00-3/26 JICST file (JOIS)

Claims (22)

(57) [Claims] A plurality of voice connections for transferring voice information communicated between voice ATM terminals using voice cells and data information communicated between data ATM terminals include data cells and data traffic control cells (hereinafter referred to as RMs). In a ATM traffic control device provided in an ATM (Asynchronous Transfer mode) multiplex transmission device that accommodates a data connection that transfers data using the same ATM line, a voice ATM terminal sends the data connection at predetermined intervals. A transmission rate determination unit that monitors the arrival status of voice cells in the plurality of voice connections, predicts the number of arriving voice cells in the next cycle, and determines a data traffic transmission rate, and receives a data traffic control cell from an ATM line. And a transmission rate changing unit for setting the transmission rate in the data traffic control cell and transmitting the data to the data ATM terminal. Characteristic ATM traffic control device. 2. A data cell and voice A from a data ATM terminal.
A transmission buffer for receiving and accumulating voice cells from the TM terminal, a transmission circuit for transmitting the cells of the transmission buffer, and a prediction coefficient based on the number of simultaneously connected voice connections. A rate calculation circuit that calculates a transferable rate based on the number of voice cells, an RM cell processing circuit that processes an RM cell that includes a transfer rate specification value that specifies a transfer rate for a data ATM terminal on the transmission side, A receiving buffer for storing the received data cells, wherein the RM cell processing circuit is configured to transmit the data from the rate calculating circuit more than the specified transfer rate in the RM cell. 2. The ATM according to claim 1, wherein if the value of the transfer rate is small, the transfer rate designation value included in the RM cell is replaced with the transferable rate value from the rate calculation circuit. Traffic control device. 3. The rate calculating circuit determines whether or not the voice cell is used as voice band data, and individually monitors the arrival status of the voice cell having voice information and the voice cell of voice band data. 3. The ATM traffic control device according to claim 2, wherein the number of arriving voice cells in the next cycle is predicted based on the result, and the transmission rate of data traffic is determined. 4. A data cell and voice A from a data ATM terminal.
A transmission buffer that receives and accumulates voice cells from the TM terminal, a transmission circuit that transmits cells in the transmission buffer, monitors signaling information, and, based on the signaling information, determines the number of simultaneously connected voice connections (hereinafter referred to as the number of voice connections). ,
A signaling monitor circuit for generating the number of simultaneous connections); a rate calculation circuit for obtaining a prediction coefficient based on the number of simultaneous connections; and calculating its own transferable rate based on the prediction coefficient and the number of incoming voice cells. An RM cell processing circuit that processes an RM cell that includes a transfer rate specification value that specifies a transfer rate to a transmitting data ATM terminal; a reception circuit that receives cells; and a reception buffer that stores received data cells. The ATM traffic control device according to claim 1, comprising: 5. The rate calculation circuit according to claim 4, wherein when the number of simultaneous voice connections exceeds a prescribed value, the arrival state of voice cells in the next cycle is predicted based on the number of simultaneous connections. ATM traffic control device. 6. The rate calculation circuit predicts the number of cells arriving in this cycle from a cycle at which the data ATM terminal changes the transmission rate and an arrival situation of voice cells.
The ATM traffic control device as described. 7. A data cell and voice A from a data ATM terminal.
A transmission buffer for receiving and accumulating voice cells from the TM terminal, a transmission circuit for transmitting the cells of the transmission buffer, and a prediction coefficient based on the number of simultaneously connected voice connections. A rate calculation circuit that calculates its own transferable rate based on the number of voice cells, and an RM cell processing circuit that processes RM cells that include a transfer rate specification value that specifies the transfer rate for the transmitting data ATM terminal A receiving circuit for receiving cells, a receiving buffer for storing received data cells, and a data monitoring circuit for monitoring the arrival status of data cells and calculating a period at which the data terminal changes the transmission rate. The ATM traffic control device according to claim 1, wherein: 8. The RM cell processing circuit spontaneously transmits the backward RM cell when the arrival state of the backward RM cell is monitored and the lack of the backward RM cell is detected. Item 4. The ATM traffic control device according to item 2. 9. An RM cell processing circuit monitors an arrival state of a data connection in a data connection, and
3. A method according to claim 2, wherein the ATM terminal obtains a period and a change rate at which the transmission rate is changed when a backward RM cell is lost.
The ATM traffic control device as described. 10. The rate calculating circuit according to claim 2, wherein a prediction coefficient for calculating the number of arriving voice cells in the next cycle is automatically corrected based on voice cell arrival states in a plurality of voice connections. ATM traffic control device. 11. A rate calculating circuit having a buffer for separating and storing voice cells and data cells, and for determining a data traffic transmission rate based on the storage state of the data cells and the arrival state of voice cells in a plurality of voice connections. The ATM traffic control device according to claim 2, wherein the determination is made. 12. A plurality of voice connections for transferring voice information communicated between voice ATM terminals by using voice cells, and data information communicated between data ATM terminals by data cells and data traffic control cells (hereinafter referred to as RMs). In the ATM traffic control method provided in the ATM (Asynchronous Transfer mode) multiplex transmission method, in which data connections to be transferred using cells are accommodated in the same ATM line, the data is transmitted from the voice ATM terminal at predetermined intervals. Monitoring the arrival status of voice cells in the plurality of voice connections, determining a transmission rate of data traffic by predicting the number of arriving voice cells in the next cycle, and receiving a data traffic control cell from the ATM line. A transmission rate changing step of setting the transmission rate in the data traffic control cell and transmitting the data to the data ATM terminal. An ATM traffic control method, characterized in that: 13. A transmission buffer step for receiving and storing a data cell from a data ATM terminal and a voice cell from a voice ATM terminal, a transmission step for transmitting cells in the transmission buffer step, and a voice connection simultaneously connected. A rate calculation step of calculating a transferable rate based on the prediction coefficient and the number of arriving voice cells, and a transfer for designating a transfer rate to the data-side ATM terminal on the transmission side. An RM cell processing step of processing the RM cell including the specified rate value; a reception step of receiving the cell; and a reception buffer step of storing the received data cell. The RM cell processing step is included in the RM cell. If the value of the transferable rate from the rate calculation step is smaller than the specified transfer rate value, the transfer rate specification value included in the RM cell is calculated from the rate calculation step. ATM traffic control method according to claim 12, wherein replacing the value of the transferable rate. 14. The rate calculating step determines whether or not the voice cell is used as voice band data, and monitors the arrival status of the voice cell having voice information and the voice cell of the voice band data individually. 14. The ATM traffic control method according to claim 13, wherein the number of arriving voice cells in the next cycle is predicted based on the result, and the transmission rate of data traffic is determined. 15. A receiving buffer step for receiving and accumulating a data cell from a data ATM terminal and a voice cell from a voice ATM terminal, a transmitting step for transmitting a cell in a transmitting buffer step, and monitoring signaling information. The number of simultaneously connected voice connections based on the signaling information (hereinafter referred to as
A signaling monitoring step of creating a number of simultaneous connections), a rate calculating step of obtaining a prediction coefficient based on the number of simultaneous connections, and calculating its own transferable rate based on the prediction coefficient and the number of incoming voice cells. An RM cell processing step for processing an RM cell including a transfer rate specification value for specifying a transfer rate for a data ATM terminal on the transmission side; a reception step for receiving the cell; and a reception buffer for storing the received data cell. 13. The ATM traffic control method according to claim 12, comprising the steps of: 16. The rate calculating step according to claim 15, wherein when the number of simultaneous voice connections exceeds a prescribed value, the arrival status of voice cells in the next cycle is predicted based on the number of simultaneous connections. ATM traffic control method. 17. The rate calculating step predicts the number of cells arriving in this cycle from the cycle at which the data ATM terminal changes the transmission rate and the state of arrival of voice cells.
14. The ATM traffic control method according to item 13. 18. A transmission buffer step for receiving and storing data cells from a data ATM terminal and voice cells from a voice ATM terminal, a transmission step for transmitting cells in the transmission buffer step, and a voice connection which is simultaneously connected. Rate calculation step of obtaining a transfer coefficient based on the prediction coefficient and the number of arriving voice cells, and specifying a transfer rate for a data ATM terminal on the transmission side. An RM cell processing step of processing an RM cell including a transfer rate specification value to be transmitted, a reception step of receiving the cell, a reception buffer step of storing the received data cell, and a data terminal that monitors the arrival state of the data cell and 13. The ATM traffic control method according to claim 12, further comprising: a data monitoring step of calculating a cycle for changing a transmission rate. 19. The RM cell processing step spontaneously transmits the backward RM cell when the arrival state of the backward RM cell is monitored and the lack of the backward RM cell is detected. Item 14. The ATM traffic control method according to item 13. 20. The RM cell processing step monitors an arrival state of a data connection in a data connection, and obtains a cycle and a change rate at which a data ATM terminal changes a transmission rate when a backward RM cell is lost. Term
14. The ATM traffic control method according to item 13. 21. The rate calculating step according to claim 13, wherein a prediction coefficient for calculating the number of arriving voice cells in the next cycle is automatically corrected based on arrival states of voice cells in a plurality of voice connections. ATM traffic control method. 22. The rate calculating step includes a buffering step of separating and storing voice cells and data cells, and a data traffic transmission rate based on the storage state of the data cells and the arrival state of voice cells in a plurality of voice connections. 14. The ATM traffic control method according to claim 13, wherein is determined.