JP2000049807A - ATM cell transmitting apparatus, ATM cell receiving apparatus, and ATM cell transmitting / receiving system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct transmission of plurality of audio information sets at a low bit rate assembled into packets and multiplexed on an ATM VC or transmission of audio information at a low bit rate and information of a 64 kbit/s system multiplexed on one ATM VC or the like efficiently. SOLUTION: A maximum cell assembling delay setting notice section 21 of the ATM cell transmitter 1 sets various cell assembling limit times to cells dynamically based on all data types and a channel number of each data type during communication and a packet delay fluctuation absorption section 22 of the ATM cell receiver 11 similarly sets dynamically an absorption amount of delay fluctuation in matching with number of channels or the data types during communication. Thus, the delay time in the entire system is minimized with respect to all the data types and number of channels for each data type during communication.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of packetizing low bit rate audio information obtained by using, for example, an audio encoding technique or a silent compression technique that does not transmit a silent part, to form one asynchronous transfer mode (Asynchronous Transfer Mode: A
TM) virtual channel (VC)
Alternatively, these low bit rate audio information and 64 kb
it / s information (existing telephone voice, fax data, mode
In particular, the present invention relates to an ATM cell transmitting apparatus, an ATM cell receiving apparatus, and an ATM cell transmitting / receiving system suitable for minimizing a communication delay time. .

[0002]

2. Description of the Related Art Conventionally, when low bit rate audio information using a low bit rate encoding technique or a silent compression technique is applied to an ATM network, a header is added to each low bit rate audio information as shown in FIG. Then, these voice packets are collected in a plurality of channels (ch # 1, ch # 2, Ch # 3) and one A
Techniques for multiplexing on TMVC are being considered.

In this technique, a plurality of channels (ch # 1, ch # 2,
By multiplexing the voice packet of Ch # 3) into one ATM cell, cell delay can be suppressed and highly efficient cell conversion can be achieved. Therefore, this technique has an advantage over the conventional telephone network that the line cost can be reduced without deteriorating the quality. However, when the number of multiplexed channels is small, the following problem remains.

[0004] Fig. 9 shows ITU-T recommendation G.729, which is one of the 8 kbit / s low bit rate coding schemes, and low bit rate audio information generated by a silent compression technique. 7 shows the average transfer efficiency of the ATM cell payload with respect to the elapsed time from the start of the cellization when the cell is converted into an ATM cell.

[0005] For example, in the figure, when the number of channels (the number of multiplexes) N = 16, the cell-limited time (elapsed time) is set to 8
When the time is set to ms, almost 100% of the transfer efficiency is obtained, but when the time is set to 6 ms, the average transfer efficiency becomes slightly more than 95%. Also, when the number of channels (the number of multiplexes) N = 32, when the cell-limited time (elapsed time) is 4 ms, almost 1
A transfer efficiency of 00% is obtained.

As described above, when performing silence compression, if the number of channels is low, the transfer efficiency of the ATM cell payload is one.
The time required to reach 00% increases, which causes deterioration of the voice quality. Therefore, it is effective to have a function of setting the optimal cell-limited time using the number of channels as a parameter.

[0007] From such a request, as shown in FIG. 10, the type of data being communicated and the number of channels of each type of data are managed, and the maximum cell delay is set based on this management information. An apparatus is described by the inventors of the present invention in Japanese Patent Application No. 10-157659.

In the ATM cell forming apparatus 1d shown in FIG.
By comparing the measured value of the time from the start of cellization in the cellization time measurement device 3 with the cellization limit time set value set in the cellization time limit setting device 4, the maximum value of the cell delay is calculated. It regulates. In addition, the number of channels for each data type can be managed using the call setting / disconnection identification function, the data type recognition device 8 and the communication channel management device 7, and the cell-forming time limit suitable for the number of communication channels can be set. , Is set in the cell limit time setting device 4.

[0009] In the cell technology of FIG. 10, the ATM cell transmitting apparatus changes the cell delay (time) by reflecting the change in the number of channels during communication.
It is desired that the ATM cell receiving apparatus which receives cells from the ATM cell transmitting apparatus, decellulates the data, and restores the packet of each channel, also absorbs such fluctuations.

However, in the conventional ATM cell receiving apparatus,
Although the variation in the cell delay (time) when the number of channels is fixed is supported, the variation in the cell delay (time) due to the change in the number of channels is considered. Absent. Here, the fluctuation of the cell delay amount (time) that occurs when the number of channels is fixed means, for example, that the number of channels (multiplex number) N = 16 in FIG. Even when the time is set to 8 ms, in actuality, the cellization may be completed before 8 ms, for example, 6 ms, which results in a change in the celling delay amount (time). In the conventional ATM cell receiving apparatus, in order to absorb such a variation, an absorption amount that assumes a case where the delay variation becomes largest, here, 8 ms is set.

As described above, in the prior art, the AT
On the M cell transmitting device side, while reflecting the change in the number of channels during communication, the cell delay can be suppressed to an optimal value.
The ATM cell receiver only sets the absorption amount assuming the case where the delay variation is the largest when the number of channels is fixed, and the ATM cell transmitter optimizes the celling delay. Even if the value is suppressed, the ATM cell receiving apparatus will suffer unnecessary delay.

[0012]

The problem to be solved is that, in the prior art, the change in the amount of cell delay (time) reflecting the change in the number of channels during communication on the ATM cell transmitting apparatus side. Cannot be efficiently absorbed by the receiving device of the ATM cell.

An object of the present invention is to solve these problems of the prior art and packetize a plurality of low bit rate voice information and multiplex them into one ATM VC, or transmit low bit rate voice information and 64 kbit / s. It is an object of the present invention to provide an ATM cell transmitting apparatus, an ATM cell receiving apparatus, and an ATM cell transmitting / receiving system that can efficiently perform transmission and the like by multiplexing s-system information with one ATM VC.

[0014]

In order to achieve the above object, an ATM cell transmitting apparatus, an ATM cell receiving apparatus, and an ATM cell transmitting / receiving system of the present invention comprise an ATM cell transmitting apparatus, wherein all types of data during communication and each data type are transmitted. When the cell limit time is dynamically changed and set based on the number of channels of the type, the ATM cell receiving apparatus also similarly uses the information used for this setting to set the delay corresponding to the number of channels or the type of data being communicated. It is configured to dynamically set the amount of fluctuation absorption. This makes it possible to minimize the delay time in the entire system with respect to all data types during communication and the number of channels of each data type.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of a configuration according to the present invention of an ATM cell transmitting apparatus, an ATM cell receiving apparatus, and an ATM cell transmitting / receiving system of the present invention. In FIG. 1, reference numeral 1 denotes an ATM cell transmitting device, and 11 denotes an ATM cell receiving device.

A plurality of telephones are connected to each of the ATM cell transmitting device 1 and the ATM cell receiving device 11,
In the cell transmission device 1, information from each telephone (64 kbit / s
Voice information) is multiplexed into one ATM cell and transmitted to the ATM cell receiving device 11. Here, the ATM cell transmitting apparatus 1 is provided with a maximum cell delay setting / notifying unit 21,
The TM cell receiver 11 includes a packet delay fluctuation absorbing unit 22
Are provided respectively.

Then, the ATM cell transmitting apparatus 1 performs cell formation by changing the cell delay (time) optimal for the number of communicating channels by the maximum cell delay amount setting / notifying section 21. Information used to determine the amount of
Notify the cell receiving device 11 and notify the ATM cell receiving device 11
Using the information, the packet delay fluctuation absorbing unit 22 dynamically sets an absorption amount corresponding to the number of communicating channels. In this example, in order to dynamically set the absorption amount corresponding to the number of communicating channels in the ATM cell receiver 11, this embodiment uses any one of the following three techniques (a) to (c). .

In the first technique (a), the ATM cell transmitting apparatus 1 uses the maximum cell delay amount setting / notifying section 21 to
The maximum cell delay amount set as the optimum value for the number of communicating channels is notified to the ATM cell receiving apparatus 11. ATM
The cell receiving device 11 performs the delay variation absorption control on the packet of each channel by the packet delay variation absorbing unit 22 based on the maximum cell delay amount received from the ATM cell transmitting device 1.

In the second technique (b), the ATM cell transmitting apparatus 1 uses the maximum cell delay amount setting / notifying section 21 to
The ATM cell receiving device 11 is notified of all data types in communication and the number of channels of each data type. The ATM cell receiving device 11 uses the packet delay fluctuation absorbing unit 22 to
An optimum delay fluctuation absorption time is calculated for all data types received from the M cell transmitting apparatus 1 and information on the number of channels of each data type, and delay fluctuation absorption control is performed for each channel bucket based on the calculation result. Do it.

In the third technology (c), the ATM cell transmitting apparatus 1 uses the maximum cell delay amount setting / notifying section 21
When a new channel is created or terminated, the channel ID (identifier), the creation or termination of the channel, and the data type of the channel,
When the data type of the currently communicating channel is changed, the channel ID and the changed data type are notified to the ATM cell receiving apparatus 11.

The ATM cell receiving device 11 updates all data types and the number of channels of each data type up to that time based on each information received from the ATM cell transmitting device 1 by the packet delay fluctuation absorbing unit 22. An optimum delay fluctuation absorption time for this is calculated, and delay fluctuation absorption control is performed on the packets of each channel based on the calculation result.

As described above, when the ATM cell transmitting apparatus 1 dynamically sets the cell-forming time limit (the maximum cell-forming delay amount) based on all data types in communication and the number of channels of each data type, Since the ATM cell receiving device 11 dynamically sets the amount of delay fluctuation absorption corresponding to the number of channels or the data type during communication, the ATM cell receiving device 11 also performs all data types during communication and each data type during communication. Delay time can be minimized with respect to the number of channels.

FIG. 2 shows an ATM cell transmitting apparatus of the present invention and A
FIG. 11 is a block diagram showing a second embodiment of the configuration according to the present invention of the TM cell receiving device and the ATM cell transmitting / receiving system. In the example shown in FIG. 2, the ATM cell transmitting device 1a
The maximum cell delay amount setting unit 21a changes the cell delay (time) to the optimal cell delay amount (time) for the number of channels during communication, and performs cell formation. The ATM cell receiving apparatus 11a uses the packet delay fluctuation absorber 22a to By using the fourth technique (d), the absorption amount corresponding to the number of channels during communication is dynamically set.

In the fourth technique (d), the ATM cell transmitting apparatus 1a uses the maximum cell delay setting section 21a to change the cell delay (time) to the optimum cell delay (time) for the number of communicating channels. The first to the first of FIG.
Unlike the third technique (c), the ATM cell receiving apparatus 11 is not notified of the maximum cell delay amount that is optimally changed according to the number of channels during communication and information used for the setting. .

That is, the ATM cell receiving device 11a
Upon receiving a packet carrying each data type sent from the ATM cell transmitting apparatus 1a, the packet delay fluctuation absorbing unit 2
According to 2a, the channel ID (identifier) and the packet length are analyzed. If the channel ID of this packet is a new channel ID, or if the received packet length has changed, the total The data type and the number of channels of each data type are updated, the optimum delay fluctuation absorption time is calculated for the data type, and the delay fluctuation absorption control based on the calculation result is performed on the packets of each channel.

Even with such a configuration, the ATM cell receiving apparatus 11 can dynamically set the amount of delay fluctuation absorption corresponding to the number of channels or the data type during communication, and all data types during communication and The delay time can be minimized for the number of channels of each data type. Next, the first technique of (a) to (d) will be described with reference to FIGS.
An ATM cell transmitting apparatus and an ATM cell receiving apparatus using the fourth technique described above, and an ATM cell transmitting / receiving system including them will be described in further detail.

FIG. 3 shows an ATM cell transmitting apparatus of the present invention and A
FIG. 13 is a block diagram showing a third embodiment of the configuration according to the present invention of the TM cell receiving device and the ATM cell transmitting / receiving system. The example shown in FIG. 3 shows the configuration of an ATM cell transmission / reception system using the first technique shown in FIG. 1A, and the ATM cell transmission device 1 uses the ATM cell explained in FIG.
The control signal generation device 10 is provided in the cell device 1d.

The provision of the control signal generating device 10 allows the ATM cell transmitting device 1 to
A notification of the maximum cell delay amount is made toward 1. still,
The call setup / disconnection identification device 9 in the figure is a function provided in the communication channel management device 7 in FIG.

In this example, the information output device 2 encodes the information to be transferred by low bit rate voice coding (using ITU-T recommendation G.729) if the information to be transferred is voice.
64kbit / s Pu1se C for FAX or modem
Encode with ode Modulation (PCM). When the voice channel setting is performed, the call setting / disconnection identification device 9 receives the information of the channel setting (call setting / disconnection information) from the information output device 2 and notifies the communication channel management device 7 of the information. At this time, the data type recognizing device 8 notifies the communication channel management device 7 of the recognition result of the data type, here, voice.

Upon obtaining the audio channel setting information, the communication channel management device 7 increases the number of audio channels currently in communication by one. Then, a cell limit time suitable for the current number of channels is set in the cell limit time setting device 4. The cell device 6 converts the voice information of each channel to a packet length of 13 bytes.
The FAX information is packetized with a packet length of 43 bytes, and these packets are multiplexed into cells.

When a new channel is set, the cell forming device 6 assigns a new channel ID to the packet. Furthermore, when the packet is stored at the head of the payload of the cell, the cellifying device 6 transmits celling start information to the celling time measuring device 3. Along with this, the celling time measuring device 3 measures the time from the start of celling.

The comparator 5 compares the measured value of the cell-forming time measuring device 3 with the set value of the cell-forming time limit of the cell-forming time limit setting device 4. , And sends a command to forcibly end cell formation. Upon receiving this command, the cell forming device 6 ends the cell formation and sends the cell to the transmission path. In this way, when the voice channel is set, the cell limit time set in the cell limit time setting device 4 is set as the maximum cell delay time via the control signal generator 10 and the ATM cell receiver 11. Will be notified.

The notification between the ATM cell transmitting device 1 and the ATM cell receiving device 11 is transferred by the control signal generating device 10 and the control signal receiving device 13 together with their channel control signals. Then, the ATM cell receiving device 11
Upon receiving an ATM cell from the ATM cell transmitting device 1, the decellularizing device 12 performs a decellularizing process for extracting a packet multiplexed therein.

Further, the ATM cell receiver 11 receives the maximum cell delay by the control signal receiver 13,
This is set in the delay fluctuation absorption time setting device 14. Then, the packet delay fluctuation absorbing device 15 performs the delay fluctuation absorption control based on the new setting time set in the delay fluctuation absorbing time setting device 14 for the packets of each channel. The voice or fax information after this absorption processing is
The data is decoded by a decoding device (not shown) and sent to each terminal (information input device 16). U.

FIG. 4 shows an ATM cell transmitting apparatus of the present invention and A
FIG. 14 is a block diagram showing a fourth embodiment of the configuration according to the present invention of the TM cell receiving apparatus and the ATM cell transmitting / receiving system. The example shown in FIG. 4 shows the configuration of the ATM cell transmission / reception system using the second technique shown in FIG. 1 (b). The control signal generation device 10a in the ATM cell transmission device 1b of the present example performs communication. Information from the channel management device 7a, that is, all data types during communication and the number of channels of each data type are transmitted to the ATM cell receiving device 11b as control signals.

For example, when an audio channel is set, the communication channel management device 7a is set as in the example of FIG.
Increases the number of voice channels currently in communication by one. The updated information on all data types and the number of channels of each data type is transferred to the control signal generation device 10a,
ATM signal receiver 11b from control signal generator 10a
Is transmitted to the control signal receiving device 13a.

In the ATM cell receiving device 11b, information from the ATM cell transmitting device 1b received by the control signal receiving device 13a (information on all data types and the number of channels of each data type updated by the communication channel management device 7a) is transmitted. , To the communication channel management device 17. The communication channel management device 17 calculates an optimum delay fluctuation absorption time based on the notified information, and sets the calculation result in the delay fluctuation absorption time setting device 14.

In the ATM cell receiving device 11b,
In the same manner as in the example in FIG.
5, the delay fluctuation absorption control based on the new set time set in the delay fluctuation absorption time setting device 14 is performed on the packet of each channel decellularized by the decellularization device 12. The voice or FAX information after this absorption processing is decoded by a decoding device (not shown) and sent to each terminal (information input device 16).

FIG. 5 shows the ATM cell transmitting apparatus of the present invention and A
FIG. 14 is a block diagram showing a fifth embodiment of the configuration according to the present invention of the TM cell receiving apparatus and the ATM cell transmitting / receiving system. The example shown in FIG. 5 shows the configuration of an ATM cell transmission / reception system using the third technique (c) in FIG. 1, and the control signal generation device 10b in the ATM cell transmission device 1c of the present example Information from the channel management device 7b, that is, the channel ID and the call generation and data type, or the channel ID and the call end and data type, or the channel ID and the changed data type are used as control signals for the ATM cell receiving device. 11c.

That is, when a new channel is generated or terminated from the communication channel management device 7b to the control signal generation device 10b, the channel I
D, generation or termination of a channel, notification of the data type of the channel, and, when the data type of the channel being communicated is changed, notification of the channel ID and the changed data type are performed. Is transmitted from the control signal generator 10b to the control signal receiver 13b of the ATM cell receiver 11c.

In the ATM cell receiving device 11c, information (channel ID, call generation and data type, or channel ID, call termination and data type, or channel ID, call generation and data type) received from the ATM cell transmitting device 1c received by the control signal receiving device 13b. The communication channel management device 17a is notified of the ID and the changed data type). Communication channel management device 17a
Increases the number of channels of the data type “voice” by 1, calculates an optimum delay fluctuation absorption time based on the notified information,
This calculation result is set in the delay fluctuation absorption time setting device 14.

Then, in the ATM cell receiving device 11b,
Similarly to the examples in FIGS. 3 and 4, the delay variation absorption control based on the new set time set in the delay variation absorption time setting device 14 is decelerated by the deceleration device 12 by the packet delay variation absorption device 15. This is performed for packets of each channel. The voice or FAX information after this absorption processing is decoded by a decoding device (not shown) and sent to each terminal (information input device 16).

FIG. 6 shows the ATM cell transmitting apparatus of the present invention and A
FIG. 14 is a block diagram showing a sixth embodiment of the configuration according to the present invention of the TM cell receiving device and the ATM cell transmitting / receiving system. The example shown in FIG. 6 shows the configuration of the ATM cell transmission / reception system using the fourth technique (d) shown in FIG. 2 and is limited to the configuration of the ATM cell receiving device 11a. The ATM cell transmitting apparatus has the same configuration as that shown in FIG. 10 and is not shown.

In this example, similarly to the example shown in FIG. 3, a voice channel is set from the information output device. The information is packetized with a packet length of 43 bytes, and these packets are multiplexed into cells. The ATM cell receiving device 11a
When an ATM cell is received from the TM cell transmitting device, the packet multiplexed in the received ATM cell is extracted by the decellularizing device 12a, and its channel ID and packet length are notified to the communication channel managing device 17b.

When a voice packet having a new channel ID arrives at the decellularization device 12a, the communication channel management device 17b determines the data type from the packet length (13 bytes) of the channel, and manages the data type " Increase the number of “voice” channels by one. Then, an optimum delay fluctuation absorption time is calculated based on the updated value, and the calculation result is set in the delay fluctuation absorption time setting device 14.

The ATM cell receiving device 11a uses the packet delay variation absorbing device 15 to control the delay variation based on the new setting time set in the delay variation absorbing time setting device 14 in the same manner as in the examples in FIGS. The absorption control is performed on the packet of each channel decellularized by the decellularization device 12a. The voice or FAX information after this absorption processing is decoded by a decoding device (not shown) and sent to each terminal (information input device 16).

FIG. 7 shows the ATM cell transmitting apparatus of the present invention and A
It is a flow chart which shows the example of processing operation concerning the present invention of the TM cell receiving set and the ATM cell transmitting and receiving system.
This example is particularly applicable to the ATM cell transmitting device 1 and A
FIG. 7A shows an example of the processing operation of the TM cell receiving apparatus 11 and the ATM cell transmitting / receiving system including the same.
FIG. 7B shows an example of a processing operation for notifying the maximum cell delay amount on the ATM cell transmitting device side, and FIG. 7B shows an example of a processing operation for setting the delay fluctuation absorption time on the ATM cell receiving device side.

In FIG. 7A, when a change in the number of channels occurs, such as the occurrence of a new channel or the end of a channel (step 701), the ATM cell transmitting apparatus recognizes the type of the data (step 702). Then, the number of channels for each data type is obtained (step 703).

Then, the maximum permissible value (Tm) of the celling time stored in advance and associated with the acquired number of channels for each data type is read out and set (step 704), and the maximum permissible value of the set celling time is set. The value (Tm) is notified to the ATM cell receiving apparatus as the maximum cell delay (step 705).

In FIG. 7B, the ATM cell receiving apparatus waits for the notification of the maximum cell delay from the ATM cell transmitting apparatus (step 706), and the delay variation corresponding to the notified maximum cell delay. The absorption time is set (step 707). Thereafter, delay fluctuation absorption processing is performed based on the set value of the delay fluctuation absorption time.

As described above with reference to FIGS. 1 to 7, in the ATM cell transmitting apparatus, the ATM cell receiving apparatus, and the ATM cell transmitting / receiving system of the present embodiment, the number of communicating channels and The celling limit time can be dynamically set in accordance with the data type, and cellization that achieves both high efficiency and low delay can be performed. Also,
In the ATM cell receiver, the delay fluctuation absorption amount is dynamically set in accordance with the number of communication channels or data types, and the delay time is minimized for all data types during communication and the number of channels of each data type. Can be
As an ATM cell transmission / reception system, the communication delay time can be dynamically minimized in accordance with all data types during communication and the number of channels of each data type.

Such delay fluctuation absorption is realized by holding data in a buffer for a certain period of time. Therefore, even with the same holding time, the required buffer amount increases in proportion to the data speed. For example, the retention time is 10
In the case of ms, the buffer amount is 10 By for 8 kbit / s data
te can be used, but for 64 kbit / s data, the buffer capacity is 80
Byte is also required. In this example, there is an effect of reducing the buffer amount. That is, when a 64 kbit / s FAX channel is generated, in this example, a change in the data type is recognized and the delay fluctuation absorption time can be shortened, so that the buffer amount can be suppressed.

The present invention is not limited to the embodiment described with reference to FIGS. 1 to 7, and can be variously modified without departing from the gist thereof. For example, in this example, low bit rate voice information, FAX data, and modem data are shown as data to be cellized, but existing telephone voice (64 kbit / s voice) information is directly used (low bit rate voice coding). It is also possible to add it as data to be cellized (without).

Although the present embodiment does not specifically describe the fluctuation (fluctuation) of the cell delay occurring in the network, the maximum value of such fluctuation in the network is set in advance. This can be dealt with by setting it and treating it as a fixed thing.

[0055]

According to the present invention, the change in the cell delay (time) reflecting the number of channels during communication on the ATM cell transmitting device side is efficiently absorbed by the ATM cell receiving device. A plurality of low bit rate voice information can be packetized and multiplexed on one ATM VC for transmission, or the low bit rate voice information and 64 kbit / s information can be multiplexed on one ATM VC. Can be efficiently transmitted.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a configuration according to the present invention of an ATM cell transmitting apparatus, an ATM cell receiving apparatus, and an ATM cell transmitting / receiving system of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the configuration according to the present invention of the ATM cell transmitting apparatus, the ATM cell receiving apparatus, and the ATM cell transmitting / receiving system of the present invention.

FIG. 3 is a block diagram showing a third embodiment of the configuration according to the present invention of the ATM cell transmitting apparatus, the ATM cell receiving apparatus, and the ATM cell transmitting / receiving system of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the configuration according to the present invention of the ATM cell transmitting apparatus, the ATM cell receiving apparatus, and the ATM cell transmitting / receiving system of the present invention.

FIG. 5 is a block diagram showing a fifth embodiment of the configuration according to the present invention of the ATM cell transmitting apparatus, the ATM cell receiving apparatus, and the ATM cell transmitting / receiving system of the present invention.

FIG. 6 is a block diagram showing a sixth embodiment of the configuration according to the present invention of the ATM cell transmitting apparatus, the ATM cell receiving apparatus, and the ATM cell transmitting / receiving system of the present invention.

FIG. 7 is a flowchart showing an example of processing operation of the ATM cell transmitting apparatus, the ATM cell receiving apparatus, and the ATM cell transmitting / receiving system according to the present invention.

FIG. 8 is an explanatory diagram showing an example of a cell operation of the ATM cell transmitting apparatus.

FIG. 9 is an explanatory diagram showing a change in an average transfer efficiency of a payload of an ATM cell with respect to an elapsed time from the start of cell formation.

FIG. 10 is a block diagram showing a configuration example of an ATM cell transmitting apparatus according to the present invention.

[Explanation of symbols]

1, 1a to 1c: ATM cell transmitting device, 1d: ATM cell forming device, 2: information output device, 3: cellizing time measuring device, 4, 4a, 4b: celling limit time setting device, 5: comparator, 6: Cellular device, 7, 7a, 7b: Communication channel management device, 8: Data type recognition device, 9: Call setup / disconnection identification device, 10, 10a, 10b: Control signal generation unit, 1
1, 11a to 11c: ATM cell receiving device, 12, 12
a: decellularization device, 13, 13a, 13b: control signal receiving device, 14: delay fluctuation absorption time setting device, 15: packet delay fluctuation absorption device, 16: information input device, 17, 1
7a, 17b: communication channel management device, 21: maximum cell delay amount setting / notification unit, 21a: maximum cell delay amount setting unit, 22, 22a: packet delay fluctuation absorbing unit.

Claims (8)

[Claims] 1. When multiplexing each packet of a plurality of channels into cells, the maximum delay time of the cellization is dynamically adjusted in accordance with information including the number of channels to be multiplexed and the data type of each channel. An ATM cell transmitting device for setting, cellizing at the set maximum cell delay time, and sending out to the ATM cell receiving device, wherein the dynamically set maximum cell delay time is set to the ATM cell. An ATM cell transmitting device comprising means for notifying a receiving device. 2. When multiplexing each packet of a plurality of channels to form a cell, the maximum delay of the cell formation corresponding to information including the number of channels to be multiplexed and the bit rate or data type of each channel. Set the time dynamically,
Perform cellization with the maximum delay time of the set cellization,
An ATM cell transmitting device for transmitting to an ATM cell receiving device, the ATM cell receiving device transmitting information including the number of channels to be multiplexed used for setting the maximum delay time and the bit rate or data type of each channel. An ATM cell transmission device comprising means for notifying a device. 3. When multiplexing each packet of a plurality of channels into a cell, the maximum delay of the cell formation corresponding to the number of channels to be multiplexed and information including the bit rate or data type of each channel. Set the time dynamically,
Perform cellization with the maximum delay time of the set cellization,
An ATM cell transmitting apparatus for transmitting to an ATM cell receiving apparatus, wherein a newly generated channel identifier and information indicating generation, an ended channel identifier and information indicating termination, and a bit rate or a data type changed during communication are changed. Information indicating the changed channel identifier and change, information including the bit rate or data type of the newly generated channel, information including the bit rate or data type of the terminated channel, and information changed during the communication. An ATM cell transmitting device comprising means for notifying the ATM cell receiving device of information including a bit rate or a data type of a subsequent channel. 4. An ATM cell receiving apparatus for receiving a cell from the ATM cell transmitting apparatus according to claim 1 and transmitting each decellularized packet for each channel.
Means for receiving the maximum delay time of the cellization notified from the TM cell transmitting apparatus; and, based on the maximum delay time of the cellularization received by the means, a packet for each channel in communication with the ATM cell transmitting apparatus. Means for calculating the delay absorption time, based on the delay absorption time calculated by the means,
Means for performing absorption control with respect to a delay variation of a packet of each channel during communication with the ATM cell transmitting apparatus. 5. An ATM cell receiving apparatus for receiving a cell from the ATM cell transmitting apparatus according to claim 2 and transmitting each decellularized packet for each channel.
Means for receiving information including the number of channels to be multiplexed and the bit rate or data type of each channel notified from the TM cell transmitting apparatus, and the ATM cell transmitting apparatus based on the information received by the means. Means for calculating a delay absorption time for a packet of each channel being communicated; and A based on the delay absorption time calculated by the means.
An ATM cell receiving apparatus comprising: a means for performing absorption control on a delay variation of a packet of each channel during communication with a TM cell transmitting apparatus. 6. An ATM cell receiving apparatus for receiving a cell from the ATM cell transmitting apparatus according to claim 3 and transmitting each decellulated packet for each channel.
The identifier of the newly created channel and the information indicating the generation notified from the TM cell transmitting apparatus, the identifier of the terminated channel and the information indicating the termination, the identifier of the channel whose bit rate or data type has been changed during communication, and Information indicating a change, information including the bit rate or data type of the newly generated channel, information including the bit rate or data type of the terminated channel,
And means for receiving information including the bit rate or data type of the channel changed during the communication, and based on each information received by the means, the number of channels in communication with the ATM cell transmitting apparatus, and Means for determining the bit rate or data type of each channel, and calculating a delay absorption time for a packet of each channel communicating with the ATM cell transmitting apparatus based on the determination result;
An ATM cell receiving apparatus comprising: means for controlling absorption of delay fluctuation of packets of each channel being communicated with the ATM cell transmitting apparatus based on the delay absorption time calculated by the means. 7. When multiplexing each packet of a plurality of channels to form a cell, the maximum delay of the cell formation corresponding to the number of channels to be multiplexed and information including the bit rate or data type of each channel. Set the time dynamically,
In the ATM cell receiving apparatus which receives cells from the ATM cell transmitting apparatus which performs cell formation with the maximum delay time of the set cell conversion and transmits the cells and transmits the decellularized packets corresponding to each channel, the ATM cell transmission Means for storing the number of channels in communication with the device and the bit rate or data type of each channel; and a delay absorption time for packets of each channel in communication with the ATM cell transmitting device based on the information stored in the means. And the AT based on the delay absorption time calculated by the means.
Means for controlling absorption of delay variation of packets of each channel during communication with the M cell transmitting apparatus, and a bit rate or data type of a channel for the packet based on a length of the packet received from the ATM cell transmitting apparatus. Means for updating, if the identification result is different from the stored number of communicating channels and the bit rate or data type of each channel, updating the information of the stored contents; An ATM cell receiving apparatus for performing absorption control on delay variation of a packet of each channel communicating with a cell transmitting apparatus. 8. An ATM cell, comprising: the ATM cell transmitting device according to any one of claims 1 to 3; and the ATM cell receiving device according to any one of claims 4 to 7. Transmission / reception system.