JP3412524B2 - ATM cell transmitting apparatus, ATM cell receiving apparatus, and ATM cell transmitting / receiving system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention packetizes low bit rate audio information obtained by using, for example, a voice encoding technique or a silence compression technique that does not transfer a silent portion into one asynchronous transfer mode (Asynchronous Transfer Mode: A
When multiplexing to the virtual channel (VC) of TM),
Alternatively, these low bit rate audio information and 64 kb
It / s system information (existing telephone voice, FAX data, mode
The present invention relates to an ATM cell transmission technique in the case of multiplexing (m data etc.) into one ATM VC, and particularly to an ATM cell transmission device, an ATM cell reception device, and an ATM cell transmission / reception system suitable for minimizing the communication delay time. .

[0002]

2. Description of the Related Art Conventionally, when applying low bit rate audio information using low bit rate coding technology or silence compression technology 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 on multiple channels (ch # 1, ch # 2, Ch # 3) and one A
A technique of multiplexing to the TM VC is considered.

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

FIG. 9 shows ITU-T recommendation G.729, which is one of the low bit rate coding systems of 8 kbit / s, and low bit rate audio information generated by a silence compression technique, which is shown in FIG. 2 shows the average transfer efficiency of the payload of ATM cells with respect to the elapsed time from the start of cell assembling when the cells are made into ATM cells.

For example, in the figure, when the number of channels (number of multiplexing) N = 16, the cell formation time limit (elapsed time) is 8
Almost 100% of the transfer efficiency can be obtained when ms is set, but an average transfer efficiency of a little over 95% is obtained when 6 ms is set. Further, when the number of channels (number of multiplexes) N = 32, when the cell formation time limit (elapsed time) is set to 4 ms, it is almost 1
A transfer efficiency of 00% can be obtained.

As described above, in the case of performing silent compression, if the number of channels is low, the transfer efficiency of the payload of ATM cells is 1.
It takes a long time to reach 00%, which causes deterioration of voice quality. Therefore, it is effective to have a function of setting the optimal cell formation time limit using the number of channels as a parameter.

From such a request, as shown in FIG. 10, ATM cell conversion for managing the data type during communication and the number of channels of each data type and setting the maximum cell delay amount based on this management information. A device is described by the inventors of the present invention in Japanese Patent Application No. 10-157659.

In the ATM cell assembling apparatus 1d shown in FIG.
The maximum value of the cellization delay amount is calculated by comparing the measured value of the cellization time in the cellification time measurement device 3 with the cellization time limit setting value set in the cellization time limit setting device 4. It regulates. Further, the number of channels for each data type can be managed by using the call setup / disconnection identification function, the data type recognition device 8 and the communication channel management device 7, and the cell formation time limit suitable for the number of channels in communication can be set. , And set in the cell formation time limit setting device 4.

In the cell assembly technique of FIG. 10, the cell assembly delay amount (time) is changed on the side of the ATM cell transmitter, reflecting the change in the number of channels during communication.
It is also desired that the ATM cell receiving apparatus that receives cells from the ATM cell transmitting apparatus, decellizes them, and restores the packet of each channel absorbs such fluctuations.

However, in the conventional ATM cell receiver,
It corresponds to the variation of the cellization delay amount (time) when the number of channels is fixed, but does not consider the variation of the cellization delay amount (time) due to such a change of the channel number. Absent. Here, the fluctuation of the cellization delay amount (time) that occurs when the number of channels is fixed is, for example, the number of channels (multiplex number) N = 16 in FIG. 9 and the cellization time limit (elapsed time). Even if it is set to 8 ms, the cell assembling may be completed 8 ms before, for example, 6 ms, and this is the variation in the cell assembling delay amount (time). In the conventional ATM cell receiver, in order to absorb such a variation, the absorption amount is set assuming that the delay variation becomes the largest, here, 8 ms.

As described above, in the conventional technique, the AT
On the M cell transmission device side, the cellization delay can be suppressed to an optimum value by reflecting the change in the number of channels during communication.
The ATM cell receiving device side only sets the absorption amount assuming the case where the delay variation becomes the largest when the number of channels is fixed, and the ATM cell transmitting device side optimizes the cellization delay. Even if the value is suppressed to the value, the ATM cell receiving device suffers an unnecessary delay.

[0012]

The problem to be solved by the prior art is that in the prior art, the fluctuation of the celling delay amount (time) reflecting the change in the number of channels during communication on the ATM cell transmitter side. Is not able to be efficiently absorbed by the ATM cell receiving device.

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 transmit the multiplexed information in one ATM VC, or low bit rate voice information and 64 kbit / bit. An object of the present invention is to provide an ATM cell transmitting device, an ATM cell receiving device, and an ATM cell transmitting / receiving system capable of efficiently performing transmission and the like by multiplexing s-series information on 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 are an ATM cell transmitting apparatus, and all data types and respective data in communication are used. When the cell formation time limit is dynamically changed and set based on the number of channels of the type, the ATM cell receiving device similarly delays according to the number of channels or data type during communication based on the information used for this setting. The configuration is such that the fluctuation absorption amount is dynamically set. As a result, the delay time in the entire system can be minimized for all data types in communication and the number of channels of each data type.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the configuration according to the present invention of an ATM cell transmitting device, an ATM cell receiving device and an ATM cell transmitting / receiving system of the present invention. In FIG. 1, 1 is an ATM cell transmitter and 11 is an ATM cell receiver.

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

In the ATM cell transmitter 1, the maximum cellization delay amount setting / notifying unit 21 changes the cellization delay amount (time) to the optimum number of channels in communication to perform cellization. The information used to determine the amount of delay
Notifying the cell receiving device 11 of the ATM cell receiving device 11
Using the information, the packet delay variation absorber 22 dynamically sets an absorption amount commensurate with the number of channels in communication. In this ATM cell receiver 11, in order to dynamically set the absorption amount commensurate with the number of channels in communication, in this example, any one of the following three techniques (a) to (c) is used. .

In the first technique (a), the ATM cell transmitter 1 uses the maximum cell delay amount setting / notification unit 21.
The maximum cellization delay amount set as the optimum value for the number of channels in communication is notified to the ATM cell receiver 11. ATM
The cell reception device 11 causes the packet delay variation absorber 22 to perform delay variation absorption control on the packet of each channel based on the maximum cellization delay amount received from the ATM cell transmission device 1.

In the second technique (b), the ATM cell transmitter 1 uses the maximum cell delay setting / notifying unit 21 to
The ATM cell receiver 11 is notified of all data types in communication and the number of channels of each data type. The ATM cell receiver 11 uses the packet delay variation absorber 22
Optimal delay variation absorption time is calculated for all data types and the number of channels of each data type received from the M cell transmitter 1, and delay variation absorption control is performed for the bucket of each channel based on the calculation result. Do it.

In the third technique (c), the ATM cell transmitter 1 uses the maximum cell delay setting / notifying unit 21 to
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 channel being communicated is changed, the channel ID and the changed data type are notified to the ATM cell receiver 11.

The ATM cell receiver 11 updates all the data types up to that point and the number of channels of each data type based on each information received from the ATM cell transmitter 1 by the packet delay variation absorber 22. An optimum delay variation absorption time for this is calculated, and delay variation absorption control is performed on the packet of each channel based on the calculation result.

In this way, the ATM cell transmitter 1 dynamically sets the cell formation time limit (maximum cell formation 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 absorption amount of the delay fluctuation corresponding to the number of channels or data types in communication, the ATM cell receiving device 11 also has a function of all data types in communication and each data type. The delay time can be minimized with respect to the number of channels.

FIG. 2 shows an ATM cell transmitter and A of the present invention.
It is a block diagram which shows the 2nd Example of the structure which concerns on this invention of a TM cell receiver and an ATM cell transmission / reception system. In the example shown in FIG. 2, the ATM cell transmitter 1a is
The maximum cellization delay amount setting unit 21a varies the cellization delay amount (time) to the optimum number of channels in communication to perform cellization, and the ATM cell receiving device 11a uses the packet delay variation absorption unit 22a to Using the fourth technique (d), the absorption amount commensurate with the number of channels in communication is dynamically set.

In the fourth technique (d), the ATM cell transmitter 1a uses the maximum cellization delay amount setting section 21a to change the cellization delay amount (time) to the optimum cell number for the number of channels in communication. The first to the first of (a) in FIG.
Unlike the third technique of (c), the maximum cellization delay amount optimally changed according to the number of channels in communication and each information used for the setting are not notified to the ATM cell receiving device 11. .

That is, the ATM cell receiver 11a is
When the packet carrying each data type sent from the ATM cell transmitter 1a is received, the packet delay variation absorber 2
2a, the channel ID (identifier) and the packet length are analyzed, and if the channel ID of this packet is a new channel ID, or if the received packet length has changed, the total packet length is changed based on this change. The data type and the number of channels of each data type are updated, the optimum delay variation absorption time is calculated for this, and delay variation absorption control is performed on the packet of each channel based on this calculation result.

With this configuration, the ATM cell receiver 11 can also dynamically set the absorption amount of the delay variation corresponding to the number of channels or data types in communication, and all the data types in communication and The delay time can be minimized for the number of channels of each data type. Next, using FIG. 3 to FIG. 6, the first technique of (a) to (d)
An ATM cell transmitter and an ATM cell receiver using the fourth technique of No. 1 and an ATM cell transmission / reception system including them will be described in more detail.

FIG. 3 shows an ATM cell transmitter and A of the present invention.
It is a block diagram which shows the 3rd Example of the structure which concerns on this invention of a TM cell receiver and an ATM cell transmission / reception system. The example shown in FIG. 3 shows a configuration of an ATM cell transmission / reception system using the first technique of (a) in FIG. 1, and the ATM cell transmission device 1 is the ATM cell transmission device 1 described with reference to FIG.
The cell signal generator 1d is provided with a control signal generator 10.

By providing this control signal generating device 10, the ATM cell transmitting device 1 to the ATM cell receiving device 1
The notification of the maximum cellization delay amount is performed 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 the present example, the information output device 2 performs low bit rate audio encoding (using ITU-T Recommendation G.729) when the transferred information is audio, and
64kbit / s Pu1se C for FAX or mode
It is encoded by ode Moduation (PCM). When the voice channel is set, the call setup / disconnection identification device 9 receives the channel setup information (call setup / disconnection information) from the information output device 2 and notifies the communication channel management device 7 of this. At this time, the communication type managing device 7 is notified from the data type recognizing device 8 of the recognition result of the data type, in this case, voice.

When the communication channel management device 7 obtains the voice channel setting information, it increases the number of voice channels currently in communication by one. Then, a cellization time limit suitable for the current number of channels is set in the cellization time limit setting device 4. The cell assembling device 6 outputs the voice information of each channel with a packet length of 13 bytes.
In addition, the FAX information is packetized with a packet length of 43 bytes, and these packets are multiplexed in the cell.

Then, when a new channel is set, the cell assembling device 6 gives a new channel ID to the packet. Further, the cell assembling apparatus 6 transmits the cell assembling start information to the cell assembling time measuring apparatus 3 when the packet is stored at the beginning of the payload of the cell. Along with this, the cell assembly time measuring device 3 measures the time from the start of cell assembly.

The comparator 5 compares the measured value of the cell assembling time measuring device 3 with the cell assembling time limit setting value of the cell assembling time limit setting device 4, and when both values match, the cell assembling device 6 is notified. , Send an instruction to forcibly terminate cell assembly. Upon receiving this command, the cell assembling device 6 terminates the cell assembling and sends the cell to the transmission path. In this way, when the voice channel is set, the cellization time limit set in the cellization time limit setting device 4 is used as the maximum cellization delay amount, and the ATM cell reception device 11 passes through the control signal generation device 10. Will be notified.

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

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

FIG. 4 shows an ATM cell transmitter and A of the present invention.
It is a block diagram which shows the 4th Example of the structure which concerns on this invention of a TM cell receiver and an ATM cell transmission / reception system. The example shown in FIG. 4 shows the configuration of an ATM cell transmission / reception system using the second technique of (b) in FIG. 1, and the control signal generation device 10a in the ATM cell transmission device 1b of this example is Information from the channel management device 7a, that is, all data types in communication and the number of channels of each data type are sent to the ATM cell receiving device 11b as control signals.

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

In the ATM cell receiver 11b, the information from the ATM cell transmitter 1b received by the control signal receiver 13a (all data types updated by the communication channel management device 7a and information on the number of channels of each data type) is sent. , And notifies the communication channel management device 17. The communication channel management device 17 calculates the 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 receiver 11b,
In the same manner as the example in FIG. 3, the packet delay variation absorber 1
5, the delay variation absorption control based on the new set time set in the delay variation absorption time setting device 14 is performed on the packet of each channel decellized by the decellization device 12. The voice or FAX information after the absorption processing is decoded by a decoding device (not shown) and sent to each terminal (information input device 16).

FIG. 5 shows an ATM cell transmitter and A of the present invention.
It is a block diagram which shows the 5th Example of the structure which concerns on this invention of a TM cell receiver and an ATM cell transmission / reception system. The example shown in FIG. 5 shows the configuration of an ATM cell transmission / reception system using the third technique of (c) in FIG. 1, and the control signal generation device 10b in the ATM cell transmission device 1c of this example is The information from the channel management device 7b, that is, the channel ID and the call generation and the data type, or the channel ID and the call end and the data type, or the channel ID and the changed data type, are used as control signals, and the ATM cell receiving device. 11c.

That is, when a new channel is generated or the channel is 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, the channel ID and the changed data type are notified, and this information is , From the control signal generator 10b to the control signal receiver 13b of the ATM cell receiver 11c.

The ATM cell receiver 11c receives information from the ATM cell transmitter 1c received by the control signal receiver 13b (channel ID and call generation and data type, or channel ID and call termination and data type, or channel The ID and the changed data type) are notified to the communication channel management device 17a. Communication channel management device 17a
Increases the number of channels of data type "voice" by 1, calculates the optimum delay variation absorption time based on the notified information,
The calculation result is set in the delay variation absorption time setting device 14.

In the ATM cell receiver 11b,
Similarly to the example in FIGS. 3 and 4, the packet delay variation absorbing device 15 decelerates the delay variation absorbing control based on the new setting time set in the delay variation absorbing time setting device 14 by the decellizing device 12. It is performed for the packet of each channel. The voice or FAX information after the absorption processing is decoded by a decoding device (not shown) and sent to each terminal (information input device 16).

FIG. 6 shows an ATM cell transmitter and A of the present invention.
It is a block diagram which shows the 6th Example of the structure which concerns on this invention of a TM cell receiver and an ATM cell transmission / reception system. The example shown in FIG. 6 shows the configuration of the ATM cell transmitting / receiving 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 transmitter 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, voice channel setting is performed from the information output device, and in the ATM cell transmission device, the cell information is transmitted by the cellizing device into a packet length of 13 bytes and a fax. Information is packetized with a packet length of 43 bytes, and these packets are multiplexed in a cell. The ATM cell receiver 11a is
When the ATM cell is received from the TM cell transmitter, the deceller 12a takes out the packet multiplexed in the received ATM cell and notifies the communication channel manager 17b of its channel ID and packet length.

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

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

FIG. 7 shows an ATM cell transmitter and A of the present invention.
6 is a flowchart showing an example of processing operation according to the present invention of a TM cell receiving device and an ATM cell transmitting / receiving system.
This example is particularly applicable to ATM cell transmitters 1 and A in FIG.
An example of the processing operation of the TM cell receiving device 11 and the ATM cell transmitting / receiving system including them is shown in FIG.
FIG. 7B shows an example of the notification processing operation of the maximum cellization delay amount on the ATM cell transmitter side, and FIG. 7B shows an example of the processing operation for setting the delay variation absorption time on the ATM cell receiver side.

In FIG. 7A, when a change in the number of channels occurs, such as the generation of a new channel or the end of a channel (step 701), the ATM cell transmitter recognizes the data type (step 702). , The number of channels for each data type is acquired (step 703).

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

In FIG. 7B, the ATM cell receiving device waits for the notification of the maximum cellization delay amount from the ATM cell transmitting device (step 706), and the delay variation corresponding to the notified maximum cellization delay amount. The absorption time is set (step 707). Thereafter, the 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 device, the ATM cell receiving device and the ATM cell transmitting / receiving system of this example, the number of channels in communication and The cell formation time limit can be dynamically set according to the data type, and it is possible to realize cell formation that achieves both high efficiency and low delay. Also,
In the ATM cell receiver, the amount of delay fluctuation absorption that is commensurate with the number of channels or data types in communication is dynamically set, and the delay time is minimized for all data types in communication and the number of channels of each data type. Can be
Then, as the ATM cell transmission / reception system, the communication delay time can be dynamically minimized in accordance with all the data types in communication and the number of channels of each data type.

Such delay variation absorption is realized by holding the data in the 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 10By for 8kbit / s data.
te is fine, but with 64kbit / s data, the buffer amount is 80
Byte is also required. This example has the effect of reducing this buffer amount. That is, when a 64 kbit / s fax channel is generated, in this example, the change in data type can be recognized and the delay variation absorption time can be shortened, so that the buffer amount can be suppressed.

The present invention is not limited to the embodiments described with reference to FIGS. 1 to 7, and various modifications can be made without departing from the scope of the invention. For example, in this example, low bit rate voice information, FAX data, and modem data are shown as data to be converted into cells. However, existing telephone voice (64 kbit / s voice) information is unchanged (low bit rate voice encoding is performed). It is also possible to add as data to be made into cells (without needing).

Further, in the present embodiment, the fluctuation (fluctuation) of the celling delay occurring in the network is not particularly described, but the maximum value of such fluctuation in the network is set in advance. It can be dealt with by setting it and treating it as a fixed value.

[0055]

According to the present invention, fluctuations in the cellization delay amount (time) reflecting the number of channels in communication on the ATM cell transmitter side are efficiently absorbed by the ATM cell receiver. It is possible to packetize a plurality of low bit rate voice information and multiplex them into one ATM VC, or to transmit low bit rate voice information and 64 kbit / s system information into one ATM VC. Can be efficiently transmitted.

[Brief description of drawings]

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

FIG. 7 is a flowchart showing an example of processing operation of the ATM cell transmitter, the ATM cell receiver and the ATM cell transceiver system according to the present invention.

FIG. 8 is an explanatory diagram showing an example of a cell assembling operation of the ATM cell transmitter.

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

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

[Explanation of symbols]

1, 1a to 1c: ATM cell transmission device, 1d: ATM cell conversion device, 2: Information output device, 3: Cell conversion time measurement device, 4, 4a, 4b: Cell conversion time limit setting device, 5: Comparator, 6: Cellularization 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: decellization device, 13, 13a, 13b: control signal receiving device, 14: delay variation absorption time setting device, 15: packet delay variation absorption device, 16: information input device, 17, 1
7a and 17b: communication channel management device, 21: maximum cellization delay amount setting / notifying unit, 21a: maximum cellization delay amount setting unit, 22 and 22a: packet delay variation absorbing unit.

Continued Front Page (56) References JP-A-7-245628 (JP, A) JP-A-11-355284 (JP, A) Kazuhiko Nagata, Yoshihiro Kitamura, CODEC voice quality in low bit rate voice communication. Consideration of cellization and decellization techniques, Technical report SSE97-6, April 8, 1997 Juichi Tsuboya, Hiroshi Nakamura, Fumiaki Ishino, Akihisa Nakajima, Application of ATM technology to mobile communication network-Low speed voice Technical Issues of ATM Transmission-, IEICE Technical Report IN96-37, July 19, 1996 Kazuhiko Nagata, Toshiyuki Kanazawa, Takemi Nisase, Hiroshi Fujitani, A Study on ATM Cellization Control Method for Low Bit Rate Speech, Shin Gakugiho SSE98-65, August 21, 1998 (58) Fields investigated (Int.Cl. ⁷ , DB name) H04L 12/56

Claims (10)

(57) [Claims] 1. When the packets of a plurality of channels are multiplexed into cells, the maximum delay time of the cell formation is dynamically changed according to information including the number of channels to be multiplexed and the data type of each channel. An ATM cell transmitting device that sets a cell at the set maximum delay time of the cellization and sends the cell to the ATM cell receiving device, wherein the dynamically set maximum delay time of the cellization is the ATM cell. An ATM cell transmission device having means for notifying a reception device. 2. When the packets of a plurality of channels are multiplexed into cells, the maximum delay time of the cell conversion is changed according to the number of channels to be multiplexed and information including the data type of each channel. Which is an ATM cell transmitting apparatus that is set to a specific cell, performs cell formation with the set maximum cell delay time, and sends the cell to an ATM cell receiving apparatus, wherein the multiplexing channel used for setting the maximum delay time. Number, and information including the data type of each channel to the ATM cell receiving device.
TM cell transmitter. 3. When the packets of a plurality of channels are multiplexed into a cell, the maximum delay time of the cell conversion is changed according to the number of channels to be multiplexed and information including the data type of each channel. Which is an ATM cell transmitting device which is set to a desired channel, performs cell formation at the set maximum cell formation delay time, and sends the cell to the ATM cell receiving device, and a newly generated channel identifier and information indicating generation. The information indicating the identifier and the end of the ended channel, the information indicating the identifier and the change of the channel whose data type is changed during communication, the information including the data type of the newly generated channel, the data type of the ended channel, Information to include, and
An ATM cell transmitting apparatus comprising means for notifying the ATM cell receiving apparatus of information including the data type of the channel after being changed during the communication. 4. An ATM cell receiving device which receives cells from the ATM cell transmitting device according to claim 1 and sends out decellized packets corresponding to respective channels, said A cell receiving device comprising:
Means for receiving the maximum delay time for cellization notified from the TM cell transmitter, and a packet for each channel in communication with the ATM cell transmitter based on the maximum delay time for cellization received by the means Based on the means for calculating the delay absorption time and the delay absorption time calculated by the means,
An ATM cell receiving apparatus comprising: the ATM cell transmitting apparatus; and means for performing absorption control for delay variation of a packet of each channel during communication. 5. An ATM cell receiving apparatus which receives cells from the ATM cell transmitting apparatus according to claim 2 and sends out decellized packets corresponding to respective channels,
A means for receiving information including the number of channels to be multiplexed and the data type of each channel notified from the TM cell transmitter, and a means for communicating with the ATM cell transmitter based on the information received by the means. It has means for calculating the delay absorption time for the packet of each channel, and means for performing absorption control for the delay fluctuation of the packet of each channel in communication with the ATM cell transmission device based on the delay absorption time calculated by the means. An ATM cell receiving device characterized by the above. 6. An ATM cell receiving device for receiving cells from the ATM cell transmitting device according to claim 3 and sending out decellized packets corresponding to respective channels,
Information indicating the identifier and generation of the newly generated channel notified from the TM cell transmitter, information indicating the identifier of the ended channel and information indicating the end, and an identifier of the channel whose data type is changed during communication and the change Means for receiving information, information including the data type of the newly generated channel, information including the data type of the terminated channel, and information including the data type of the channel after being changed during the communication; The number of channels in communication with the ATM cell transmitter and the data type of each channel are determined based on each information received by the means, and each channel in communication with the ATM cell transmitter is determined based on the determination result. Means for calculating the delay absorption time for the packet, and communicating with the ATM cell transmitter based on the delay absorption time calculated by the means. ATM cell receiving apparatus characterized by comprising a means for absorbing control for packet jitter of each channel. 7. A maximum delay of cell formation corresponding to information including the number of channels to be multiplexed and the packet length or data type of each channel when multiplexing packets of a plurality of channels into cells. ATM cell for dynamically setting the time, performing cell formation with the maximum delay time of the set cell formation, and transmitting the ATM cell, which receives cells from the transmitting device and decellizes each packet, and sends the decellized packets to each channel In the receiving device, the number of channels communicating with the ATM cell transmitting device, and means for storing the packet length or data type of each channel, and a means for communicating with the ATM cell transmitting device based on the information stored by the means A means for calculating a delay absorption time for a packet of each channel, and a means for communicating with the ATM cell transmitter based on the delay absorption time calculated by the means. Based on the means for performing absorption control on the delay variation of the packet of each channel and the packet received from the ATM cell transmitter, the packet length or the data type of the channel for the packet is identified, and the identification result is stored in the memory. The number of channels in communication, and
If it is different from the packet length or the data type of each channel, it has means for updating the information of the above stored contents,
An ATM cell receiving device, characterized by performing absorption control for delay variation of a packet of each channel during communication with the ATM cell transmitting device. 8. The ATM cell transmission and reception system, characterized by comprising a set of ATM cells received equipment according to claim 4 and ATM cell transmitter of claim 1. 9. An ATM cell transmission / reception system comprising a set of the ATM cell transmitter according to claim 2 and the ATM cell receiver according to claim 5. 10. An ATM cell transmission / reception system comprising a set of the ATM cell transmitter according to claim 3 and the ATM cell receiver according to claim 6.