JP2002141909A - Atm-pon dynamic band control method and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system and method that sets a required band for each of IP data so as to set the band suitable for actual usage thereby permitting economical network operations. SOLUTION: In an ATM transmission network system adopting the ATM- PON(Passive Optical Network) system, a network side device 1 is provided with an incoming band control section 112 that dynamically controls the assignment of an incoming transmission band from a subscriber side device 3b to the network side device on the basis of information of a control cell for a band request sent from the subscriber side device 3b, assigns the band to transmission of data only when the subscriber device 3b actually uses the band so as to minimize the setting of fixed bands depending on the application made in advance, and distributes bands to other subscribers when the device 3b is not in operation so as to realize the economical and efficient transmission network adopting the ATM-PON system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM (Asynchro
nous Transfer Mode) Regarding network systems,
In particular, it relates to an ATM-PON dynamic band control technique.

[0002]

2. Description of the Related Art ATM-PON (Passive Optical Neural Network)
A transmission network based on the twork) method is a method that can economically convert to a home (FTTH: Fiber To The Home). There is an Internet connection as a service that makes use of the bandwidth that can be used at the time of lightening. The data used for Internet connection is IP (internet prot
ocol) in the form of a packet, and is generally used such that data is generated only at the required moment.

[0003] In the ATM-PON system, the upstream band from the subscriber to the network is generally operated in a fixed manner.

[0004] In an environment where the exchange of IP data is the main purpose, it is impossible to predict the used bandwidth in advance, so that the bandwidth is set by reporting the used bandwidth. However,
Considering the instantaneous increase of data, the set band needs to secure a very wide band, and is not economical. Further, even when the transmission network is not used, the band is fixedly secured, so that the entire transmission network is not efficient.

[0005] Therefore, in order to economically convert the light to the home, in the ATM transmission network of the ATM-PON system,
A bandwidth control method specialized for IP data is required.

[0006] As an existing band control method in the ATM-PON type ATM transmission network, there is a fixed setting by declaring a band to be used. The outline of the system configuration of the ATM-PON ATM transmission network will be described with reference to FIG. In FIG. 4, IP terminals 5a, 5b and 5c
Is a terminal that performs IP communication.

[0007] The CLADs 4a, 4b and 4c are cell assembly and deassembly devices having an Ethernet (registered trademark) interface and an ATM interface and performing mutual conversion between IP packets and ATM cells.

The optical passive elements 2a and 2b are ATM-PO
This is a device for optically combining optical signals based on the N system.

The ATM-PON subscriber unit 3b includes a transmission buffer 310 for temporarily storing an ATM cell to be transmitted.
A control cell transmitting unit 312 for generating and transmitting a control cell;
A subscriber-side optical transmission unit 311 for transmitting an optical signal of the ATM-PON system (transmitting to the optical passive element 2a via an optical fiber), and a transmission request control using a control cell when the transmission band needs to be increased. And a transmission control unit 313 that performs transmission control based on the assigned transmission timing.
A subscriber-side optical receiving unit 323 for receiving an optical signal of the ON system (receiving a signal transmitted from the optical passive element 2b via an optical fiber), and a control cell for receiving a control cell among the received ATM cells Receiver 324 and VPI to be received
(Virtual Pass Identifier) Received VP that stores the number
The I table 322 is compared with the VPI number of the received ATM cell and the value stored in the received VPI table 322, and when they match, the reception cell filter unit 321 that passes the ATM cell, and temporarily stores the received ATM cell. And a reception buffer 320 stored in the ATM-PON
The subscriber unit 3c is an ATM-PON subscriber unit 3b.
It is a device similar to.

[0010] The ATM-PON network side device 1
A transmission buffer 113 for temporarily storing TM cells, an upstream band control unit 112 for controlling an upstream band, and a control cell transmitting unit 111 for generating a control cell incorporating an upstream transmission timing based on the upstream band at regular intervals. And the sending AT
A network-side optical transmitting unit 110 for transmitting an ATM-PON optical signal by adding an M cell and a control cell;
A network-side optical receiving unit 120 for receiving an N-type optical signal; and a receiving buffer 121 for temporarily storing received ATM cells.
And a control cell receiving unit 122 for receiving a control cell among the received ATM cells.

[0011]

In the above-mentioned conventional system, the setting of the upstream band in the upstream band control unit 112 of the network device 1 is fixed. That is, there is no coordination between the state of the subscriber-side device and the band control from the network side.

As described above, in a use environment in which the exchange of IP data is the main purpose, it is necessary to secure a very wide band for a fixedly set band in consideration of a momentary increase in data. Not a target. In addition, since the bandwidth is fixedly secured even when not in use, the entire transmission network is not efficient, meaning that the network cannot be operated economically. Furthermore, when considering use at home, the usage fee is a major problem, and the operating cost of the network, which is the basis for the calculation, is a major issue for the spread of light to the home.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to set a necessary band for each data on an uplink transmission line in an ATM-PON ATM transmission network. Accordingly, it is an object of the present invention to provide a system and a method capable of setting a bandwidth suitable for actual use and enabling economical network operation.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an ATM transmission network system based on the ATM-PON system, wherein a network side device is provided based on a band request control cell transmitted from a subscriber side device. The transmission band is dynamically controlled from the subscriber unit to the network unit.

[0015]

Embodiments of the present invention will be described. The present invention is to dynamically control a transmission band from a subscriber to a network side in an ATM transmission network based on the ATM-PON system to efficiently transmit IP data.

ATM-PON (Passive Optical Network)
The ork) system is an ATM transmission system in which one network-side device and a plurality of subscriber-side devices are connected by coupling by an optical passive element. One of the features is that one network-side device is shared by a plurality of subscribers. Therefore, the cost on the network side can be reduced, and the ATM transmission network can be constructed economically by performing band control according to the actual band used for each subscriber.

In the ATM-PON system, downlink transmission from the network side to the subscriber side and uplink transmission from the subscriber side to the network side are performed using different optical frequencies, and control is performed separately. .

In the downstream transmission from the network side to the subscriber side, the same ATM cell is distributed to all subscribers. this,
In the subscriber device, the V of the own device set for each subscriber is used.
The PI (Virtual Pass Identifier) number is compared with the VPI number of the ATM cell to be delivered, and the matched one is fetched.

The band control is performed by controlling the ATM cell transmission rate from the network side, and this is realized by a shaping technique which is a traffic control function of a general ATM device.

In the upstream transmission from the subscriber unit to the network unit, the light emission timing of the optical output circuit for each subscriber unit connected by the optical passive element is controlled.
The cells from each subscriber unit are received as if they were one cell data stream.

The light emission timing in the subscriber unit is controlled based on a light emission control signal included in a control cell distributed in a manner interwoven with the downstream transmission cells from the network side device.

The upstream band control is controlled by the light emission interval set by the network device. Therefore, the band control of the upstream transmission is performed by the network side device.

As described with reference to FIG. 4, in general,
The upstream band control of the ATM-PON system is operated by declaring a band to be used or by setting a fixed band based on prediction in advance.

Here, as in the configuration shown in FIG. 2, in the use environment where the exchange of IP data is the main purpose, it is impossible to predict the used bandwidth in advance, so the bandwidth is set by reporting the used bandwidth. I have. The band set here is not economical because it is necessary to secure a very wide band in consideration of an instantaneous increase in data. In addition, since the band is fixedly secured even when not in use, the entire transmission network is not efficient.

According to the present invention, in a use environment where the exchange of IP data having the configuration shown in FIG. 2 is the main purpose, the bandwidth is allocated only during actual use, thereby minimizing the fixed bandwidth setting by prior declaration, and when not in use. The bandwidth is distributed to other subscribers, and as a result, an economical and efficient ATM-PON transmission network is realized.

FIG. 1 is a diagram for explaining the operation principle of the embodiment of the present invention. The IP packet from the IP terminal 5b is divided into a plurality of ATM cells by a CLAD (cell assembling / disassembling unit) 4b, and the ATM cells are stored in the transmission buffer 311 of the ATM-PON subscriber unit 3b.

Here, the control cell storing the light emission timing information based on the band determined by the upstream band control unit 112 of the ATM-PON network-side device 1 is transmitted to the control cell transmitting unit 111 of the ATM-PON network-side device 1. , At regular intervals, ATM-
Interlaced with data cells from the PON network-side device 1 to the subscriber device, and from the network-side optical transmitting unit 110 to all connected ATM-PON subscriber-side devices via the optical passive element 2b. ,Send.

An ATM cell stream including the above-mentioned control cell transmitted through the optical passive element 2b is received by the subscriber-side receiving section 323 of the ATM-PON subscriber-side apparatus, and when the ATM cell stream is a data cell, Referring to the VPI value in the reception VP table 322, if the VPI value matches the VPI value of the cell, the cell is stored in the reception buffer 320.

In the subscriber side receiving section 323, if the received cell is a control cell, the control cell receiving section 32
Send to 4. The control cell device 324 extracts the light emission timing information from the control cell, and sends it to the control cell transmission unit 312 and the transmission control unit 313.

The transmission control unit 313 judges from the transmission timing information and the amount of cells staying in the transmission buffer 310, and transmits a band request control cell at a timing not allocated to any ATM-PON subscriber unit. To the control cell transmitting unit 312 to perform
12 generates a band request control cell and sends it to the subscriber side optical transmission unit 311. The subscriber side optical transmission unit 311 sends out the band request control cell.

When the bandwidth request control cell transmitted from the ATM-PON subscriber unit 3b arrives at the network optical receiving unit 120 of the ATM-PON network unit 1 via the optical passive element 2a, Similarly, other ATM-
When the bandwidth request control cell from the PON subscriber side device arrives at the same timing, the data is destroyed, the data cannot be received normally, and the ATM-PON network side device 1 ignores it.

When the band request control cell transmitted from the ATM-PON subscriber unit 3b arrives at the network optical receiving unit 120 of the ATM-PON network unit 1 via the optical passive element 2a. When there is no band request control cell from the ATM-PON subscriber unit other than the ATM-PON subscriber unit 3b, the band request control cell from the ATM-PON subscriber accommodation unit 3b is the ATM-PON network. Received by the network-side optical receiving unit 120 of the local device 1,
The control cell receiving unit 122 sends the band request control cell reception information to the uplink band control unit 112.

The upstream band control unit 112 adds light emission timing information by the maximum cell length necessary for transmitting one piece of IP data, and transmits a control cell including light emission timing information to the control cell.
The control cell transmitting unit 111 interweaves the data cells from the network side device to the subscriber unit at regular intervals, and the network side optical transmitting unit 110
From the ATM-PO via the optical passive element 2b.
Sent to the N-subscriber device.

After the increase of the light emission timing by the maximum cell length is completed in the upstream band control unit 112, the value is returned to the original light emission timing value.

In the ATM-PON subscriber unit 3b, if the bandwidth does not increase even after a predetermined period of time elapses after transmitting the bandwidth request control cell, the bandwidth request control cell becomes the ATM. Judge that the PON network side device 1 has not been reached or that it has collided with a control cell from another ATM-PON subscriber side device, wait for an irregular period of time, and send out the request control cell again. By retransmission control of the request control cell,
The bandwidth of the upstream transmission path increases (even if it does not increase immediately, it will increase at some point in probability), and IP packets are transmitted.

As described above, in the ATM transmission network based on the ATM-PON system, the transmission band from the subscriber to the network can be dynamically controlled, and the IP data can be transmitted efficiently.

[0037]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 1 is a diagram showing the configuration of one embodiment of the present invention, showing an example of the configuration of an ATM-PON ATM transmission network and the internal configuration of a network-side device and a subscriber-side device.

Referring to FIG. 1, IP terminals 5a, 5b and 5c are terminals for performing IP communication. CLAD4a,
4b and 4c are Ethernet interface and ATM
This is a cell decellularization device that has an interface and performs mutual conversion.

The ATM-PON subscriber unit 3b includes a transmission buffer 310 for temporarily storing ATM cells to be transmitted.
A control cell transmitting unit 312 for generating and transmitting a control cell;
A subscriber-side optical transmission unit 311 for transmitting an optical signal of the ATM-PON system (transmission to the optical passive element 2a via an optical fiber), and transmission request control using a control cell when a transmission band needs to be increased. And a transmission control unit 313 that performs transmission control based on the assigned transmission timing.
A subscriber-side optical receiver 323 for receiving an ON-mode optical signal (receiving a signal transmitted from the optical passive element 2b via an optical fiber), and a control cell receiver for receiving a control cell among the received ATM cells Section 324, a reception VPI table 322 storing VPI numbers to be received, and a received ATM
A reception cell filter unit 321 that passes an ATM cell when the VPI number of the cell matches a value stored in the reception VPI table 322 and matches, a reception buffer 320 that temporarily stores the received ATM cell, It has. The ATM-PON subscriber side device 3c is an ATM-P
This is a device similar to the ON subscriber device 3b.

The ATM-PON network side device 1 transmits
A transmission buffer 113 for temporarily storing TM cells, an upstream band control unit 112 for adding a band request from each ATM-PON subscriber side device to a preset upstream band and determining a new set band, A control cell transmission unit 111 that generates a control cell incorporating the uplink transmission timing based on the determined uplink bandwidth at regular intervals, and performs an ATM-PON optical signal transmission by adding the transmission ATM cell and the control cell. A network-side optical transmitting unit 110, a network-side optical receiving unit 120 for receiving an ATM-PON optical signal, and a received AT
It comprises a receiving buffer 121 for temporarily storing M cells, and a control cell receiving unit 122 for receiving control cells among the received ATM cells.

The optical passive elements 2a and 2b are ATM-PO
This is a device for optically combining optical signals based on the N system.

FIG. 2 is a diagram showing a system configuration according to an embodiment of the present invention. IP terminals 5a, 5b and 5c
A terminal that performs communication. CLAD4a, 4b and 4c
Is a cellular decelerating device. The ATM-PON subscriber units 3b and 3c use an ATM-PON AT
A subscriber device that performs M processing. The optical passive element 2 has A
This is a device for optically combining optical signals based on the TM-PON system. The ATM-PON network side device 1 is an ATM-PO
This is a network device that performs ATM processing according to the N method. The IP network 6 is a network including a group of a plurality of IP terminals.

FIG. 3 is a diagram for explaining the operation of the embodiment of the present invention, and shows a sequence for increasing the upstream band. In FIG. 3, cells a402 to g410 are:
This is a data ATM cell. The OAM 401 is a control cell for indicating a light emission timing. REQ 404 is a control cell for requesting a band.

Is the light emission timing information reception timing of frame n.

Is the light emission timing information reception timing of frame n + 1.

Is a signal notifying that the data cell has stayed in the transmission buffer.

Is a command to generate a band request cell (the transmission control unit 31 in the ATM-PON subscriber unit).
3 to the control cell transmitting unit 312).

Is a command for receiving the band requesting cell and generating the emission timing information with the band increased (command from the upstream band control unit 112 to the control cell transmitting unit 111 in the network device 1).

Is the light emission timing information reception timing of frame n + 2.

Is the light emission timing information reception timing of frame n + 3.

In FIG. 1, an IP terminal 5b sends an I
It is assumed that there is a case where communication using an IP packet is performed to the P terminal 5a.

The IP packet from the IP terminal 5b is
In AD4b, the cell is divided into a plurality of ATM cells,
It is sent to the ATM-PON subscriber unit 3b.

In the ATM-PON subscriber side device 3 b, first, the ATM cell is stored in the transmission buffer 311.

A control cell (OAM (Operation And And As shown in FIG. 3) storing emission timing information based on the band determined by the upstream band control unit 112 of the ATM-PON network side device 1
Management) The cell 401) is transmitted to the control cell transmitting unit 111.
Is interlaced with the data cells from the network-side device to the subscriber device at regular intervals, and is transmitted from the network-side optical transmission unit 110 to all ATM-PON subscriber-side devices connected via the optical passive element 2b. Send.

In the ATM-PON subscriber side device 3b, the subscriber side receiving section 323 receives the ATM cell stream including the OAM cell, and if it is a data cell, the received VP
Referring to the VPI value in I table 322, the V
If the value matches the PI value, the cell is stored in the reception buffer 320. If it is a control cell (OAM cell),
It is sent to the control cell receiving unit 324. The control cell device 324 includes:
The light emission timing information is extracted from the control cell and sent to the control cell transmission unit 312 and the transmission control unit 313.

The transmission control unit 313 of the ATM-PON subscriber unit 3b transmits the transmission timing information and the transmission buffer 3
It is determined from the amount of cells staying at 10 and, when data cells stay in the transmission buffer (in the example of FIG. 3, b to g stay in the transmission buffer), which ATM-PON is used.
At the transmission timing not allocated to the subscriber device,
It instructs the control cell transmitting unit 312 to transmit the control cell (REQ) for band request.

The control cell transmitter 312 of the ATM-PON subscriber unit 3b generates a band request control cell (REQ) and sends it to the subscriber optical transmitter 311. The subscriber optical transmitter 311 A band request control cell (REQ) 404 is transmitted.

When the band request control cell (REQ) 404 arrives at the network-side optical receiving unit 120 of the ATM-PON network-side device 1 via the optical passive element 2a, similarly, another ATM to which data is to be transmitted is transmitted. -When the bandwidth request control cell from the PON subscriber side device arrives at the same timing, the data is destroyed and cannot be received normally, and the ATM-PON network side device 1
Is ignored. On the other hand, when there is no control cell for band request from another ATM-PON subscriber side device, the ATM-PO
The control cell for bandwidth request from the N subscriber accommodating device 3b normally returns to the network side optical receiving unit 120 of the ATM-PON network side device 1.
And sent to the control cell receiving unit 122.

The control cell receiving unit 122 of the ATM-PON network side device 1 sends the reception information of the band request control cell to the upstream band control unit 112, and the upstream band control unit 112 transmits one piece of IP data. The light emission timing information is added by the required maximum cell length, and the control cell (OAM) is interwoven by the control cell transmitting unit 111 with the data cell from the network device to the subscriber device at a fixed period, so that the network light is From the transmitting unit 110, the control cell (OAM) 40 via the optical passive element 2b
5 to all ATM-PON subscriber units.

After the increase of the light emission timing by the maximum cell length has been completed, the upstream band control unit 112 of the ATM-PON network side device 1 manages to return the value to the original light emission timing value (initial value).

In the ATM-PON subscriber unit 3b, if the bandwidth request control cell (REQ) is transmitted and the bandwidth does not increase after a certain period of time, the bandwidth request control cell becomes the ATM-PON network. The other side of the ATM-
It determines that it is in a collision state with the control cell from the PON subscriber side device, waits for an irregular time, and sends out the request control cell again. Stochastically the bandwidth will increase sometime, and the IP packet will be sent out.

The normally received ATM cell data is CL
It is sent to the AD 4a, decellularized and sent as an IP packet to the IP terminal 5a. The communication from the IP terminal 5a to the IP terminal 5b is according to the current ATM-PON system.

In the above-described embodiment, the increased bandwidth allocated at the time of receiving a bandwidth request control cell at one time is not fixed, but is changed in a timely manner with reference to the history of the allocated bandwidth in the past, so that more efficient operation is possible. it can.

[0064]

As described above, according to the present invention,
In the usage environment where the exchange of IP data is the main purpose, A
In the case of using the TM-PON system, by allocating the bandwidth only during the actual use, the fixed bandwidth setting by the prior declaration is minimized, and when not in use, the bandwidth is distributed to other subscribers. There is an effect that an efficient ATM-PON transmission network can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram illustrating a system configuration according to an embodiment of the present invention.

FIG. 3 is a diagram showing an operation sequence of one embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional ATM-PON type ATM transmission network.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ATM-PON network side apparatus 2a, 2b Optical passive element 3b, 3c ATM-PON subscriber side apparatus 4a, 4b, 4c CLAD (cellular decellularization apparatus) 5a, 5b, 5c IP terminal 110 Network side optical transmission part 111 Control cell transmitting unit 112 Up band control unit 113 Transmission buffer 120 Network side optical receiving unit 121 Reception buffer 122 Control cell receiving unit 310 Transmission buffer 311 Subscriber side optical transmitting unit 312 Control cell transmitting unit 313 Transmission control unit 320 Reception buffer 321 Reception Cell filter unit 322 Receive VPI table 323 Subscriber side optical receiver 324 Control cell receiver 401, 405, 411 Control cell (OAM) 402, 403, 406-410 Data cell 404 Control cell (REQ)

Claims (15)

[Claims] An ATM-PON type ATM in which a network-side device and a subscriber-side device are connected by coupling by an optical passive element.
In the transmission network system, the network device includes means for dynamically determining an upstream transmission band from the subscriber device to the network device based on band request information transmitted from the subscriber device. ing,
An ATM transmission network system, characterized in that: 2. A network device and a plurality of subscriber devices are connected by coupling by an optical passive element, and in downstream transmission from the network device to the subscriber device, coupling by an optical passive element. The same cell is distributed to all the subscriber units to be controlled, and in the upstream transmission from the subscriber unit to the network unit, the light emission timing of each of the subscriber units coupled by an optical passive element is controlled. An ATM transmission network system configured to receive a cell transmitted from the subscriber-side device to an uplink transmission line as a cell data stream in the network-side device, wherein the subscriber-side device is located on the uplink transmission line. In transmitting data, the network-side device includes means for transmitting a control cell for a band request to the network device in accordance with the amount of data to be transmitted, wherein the network device transmits a control cell for a band request from the subscriber device. Based on the control cell Can, ATM transmission network system, characterized in that comprises means for dynamically controlling the allocation of uplink transmission band. 3. A network-side device and a plurality of subscriber-side devices are connected by coupling by an optical passive element, and in downstream transmission from the network-side device to the subscriber-side device, coupling is performed by an optical passive element. The same cell is distributed to all the subscriber units to be controlled, and in the upstream transmission from the subscriber unit to the network unit, the light emission timing of each of the subscriber units coupled by an optical passive element is controlled. An ATM transmission network system configured to receive a cell transmitted from the subscriber-side device to an upstream transmission line as a cell data stream at the network-side device, wherein the network-side device is determined by an upstream band control unit. Means for transmitting a control cell storing light emission timing information based on a band to be transmitted to the subscriber side device connected via the optical passive element, wherein the subscriber side device transmits light emission timing from the control cell. Means for extracting information and transmitting a control cell for a bandwidth request, wherein the network device receives the control cell for the bandwidth request transmitted from the subscriber device and transmits the transmission data. Means for adding light emission timing information for a maximum cell length, and transmitting a control cell including the light emission timing information to the subscriber side device connected via an optical passive element. ATM transmission network system. 4. A network-side device and a plurality of subscriber-side devices are connected by coupling by an optical passive element, and in downstream transmission from the network-side device to the subscriber-side device, coupling is performed by an optical passive element. The same cell is distributed to all the subscriber units to be controlled, and in the upstream transmission from the subscriber unit to the network unit, the light emission timing of each of the subscriber units coupled by an optical passive element is controlled. The network device receives the cells transmitted from the subscriber device to the uplink transmission line as a cell data stream, and the network device and one or more of the subscriber devices,
An ATM transmission network system connected to an IP terminal via a cellularization device for performing mutual conversion between an IP packet and an ATM cell, wherein the network-side device is based on a band determined by an upstream band control unit. Means for transmitting a control cell storing light emission timing information to the subscriber device connected via the optical passive element, wherein the subscriber device extracts light emission timing information from the control cell, and Means for transmitting a control cell for request, the network-side device, upon receiving a control cell for band request transmitted from the subscriber-side device, the uplink band control unit,
Light emission timing information is added by the maximum cell length necessary for transmitting IP packet data, and a control cell including the updated light emission timing information is transmitted from the optical transmission unit to the subscriber side device via an optical passive element. An ATM transmission network system comprising means for controlling transmission. 5. The apparatus according to claim 1, wherein said subscriber unit transmits cell data obtained by converting IP packet data into ATM cells on an upstream transmission path from said subscriber unit to said network unit. The ATM transmission network system according to any one of claims 1 to 3, wherein 6. An uplink transmission band is allocated only when the subscriber unit uses an uplink transmission line, and a fixed bandwidth setting by prior declaration is set to a minimum value as an uplink transmission band managed by the network unit. 2. The method according to claim 1, wherein
5. The ATM transmission network system according to any one of claims 1 to 4. 7. The network device according to claim 1, wherein when the light emission timing has been increased by the maximum cell length, the value is returned to the original value of the light emission timing. The ATM transmission network system as described. 8. An ATM-PON type ATM in which a network-side device and a subscriber-side device are connected by coupling by an optical passive element.
A bandwidth control method for a transmission network, wherein the network-side device operates to allocate an upstream transmission band from the subscriber-side device to the network-side device based on bandwidth request information transmitted from the subscriber-side device. A dynamic bandwidth control method for an ATM transmission network, comprising: 9. A network-side device and a plurality of subscriber-side devices are connected by coupling by an optical passive element, and in downstream transmission from the network-side device to the subscriber-side device, coupling is performed by an optical passive element. The same cell is distributed to all the subscriber units to be controlled, and in the upstream transmission from the subscriber unit to the network unit, the light emission timing of each of the subscriber units coupled by an optical passive element is controlled. A bandwidth control method for an ATM transmission network configured to receive, as a cell data stream, a cell transmitted from the subscriber-side device to an uplink transmission path in the network-side device, wherein the subscriber-side device includes: Upon transmitting data on the upstream transmission path from the subscriber side device to the network side device, in accordance with the amount of stagnation of transmission data, transmits a control cell for bandwidth request to the network side device, and the network side device , A bandwidth request from the subscriber unit. A dynamic bandwidth control method for an ATM transmission network, characterized by dynamically controlling allocation of an upstream transmission bandwidth based on a control cell for request. 10. A network-side device and a plurality of subscriber-side devices are connected by coupling by an optical passive element, and in downstream transmission from the network-side device to the subscriber-side device, coupling is performed by an optical passive element. The same cell is distributed to all the subscriber units to be controlled, and in the upstream transmission from the subscriber unit to the network unit, the light emission timing of each of the subscriber units coupled by an optical passive element is controlled. A bandwidth control method for an ATM transmission network, wherein the network-side device receives cells transmitted from the subscriber-side device to an upstream transmission path as a cell data stream; Transmitting a control cell storing light emission timing information based on the band determined by the control unit to all the subscriber units connected via the optical passive element; and Departing from cell Extracting timing information and transmitting a bandwidth request control cell based on the amount of data stored in a transmission buffer; andthe network device receives the bandwidth request control cell transmitted from the subscriber device, and Transmitting the control cell including the updated light emission timing information to the subscriber side device via the optical passive element, by adding the light emission timing information by the maximum cell length necessary for transmitting the control signal. A dynamic bandwidth control method for an ATM transmission network. 11. A network-side device and a plurality of subscriber-side devices are connected by coupling by an optical passive element, and in downstream transmission from the network-side device to the subscriber-side device, coupling is performed by an optical passive element. The same cell is distributed to all the subscriber units to be controlled, and in the upstream transmission from the subscriber unit to the network unit, the light emission timing of each of the subscriber units coupled by an optical passive element is controlled. The network device receives the cells transmitted from the subscriber device to the uplink transmission line as a cell data stream, and the network device and one or more of the subscriber devices,
A bandwidth control method for an ATM transmission network connected to an IP terminal via a cellularization device for performing mutual conversion between an IP packet and an ATM cell, wherein the network device includes a bandwidth determined by an upstream bandwidth control unit. Transmitting a control cell storing light emission timing information based on the above to all the subscriber devices connected via the optical passive element, wherein the subscriber device transmits light emission timing information from the control cell. Extracting a control cell for a bandwidth request in accordance with the amount of data stored and transmitting data, and the network device receives the control cell for a bandwidth request transmitted from the subscriber device and receives an IP packet. A control cell including the updated light emission timing information, by adding the light emission timing information by the maximum cell length necessary for sending data,
Transmitting to the subscriber-side device via the optical passive device. 12. The subscriber unit transmits cell data obtained by converting IP packet data into ATM cells on an upstream transmission path from the subscriber unit to the network unit. Item 11. The dynamic bandwidth control method for an ATM transmission network according to any one of Items 8 to 10. 13. An uplink transmission band is allocated only when the subscriber unit uses an uplink transmission line, and a fixed bandwidth setting based on a prior declaration is set to a minimum value. 12. The dynamic bandwidth control method for an ATM transmission network according to claim 8, wherein the bandwidth is distributed. 14. The subscriber unit transmits cell data obtained by converting IP packet data into ATM cells on an upstream transmission line from the subscriber unit to the network unit. Item 12. The dynamic bandwidth control method for an ATM transmission network according to any one of Items 8 to 11. 15. The network device according to claim 8, wherein when the light emission timing has been increased by the maximum cell length, the value is returned to the original value of the light emission timing.
5. The dynamic bandwidth control method for an ATM transmission network according to claim 1.