KR0175567B1 - Interworking control apparatus and method for ABR / ABT transmission capability interworking of asynchronous transmission mode public network - Google Patents

Abstract

(ABR) input traffic having different resource management (RM) cell structures and flow control schemes when only asynchronous transfer mode block transfer (ABT) flow control is implemented in an asynchronous transfer mode (ATM) (ABR / ABT) transmission capability for interworking with an effective bit rate / asynchronous transmission mode block transmission (ABR / ABT) capable of receiving an asynchronous transmission mode block transmission (ABT) is required to pass through the implemented public network, a transmission capability interoperability mechanism capable of accommodating effective bit rate traffic is required, and a block cell ratio of the control unit traffic according to a change of a permissible cell ratio of a temporally variable effective bit rate source Therefore, in the present invention, an interworking unit is required to have an effective bit rate for traffic flow control Source and virtual source functions to terminate the effective bit rate forward resource management cell input from the external effective bit rate switching system and transmit the effective bit rate reverse resource management cell to the effective bit rate switching system, (ABR / ABT) by performing the asynchronous transmission mode block transmission traffic control by generating a resource management cell which requests the block cell rate band of the asynchronous transmission mode block transmission traffic according to the extracted allowed cell ratio value, Interoperability can be performed.

Description

Interworking control device and method for ABR / transmission capability interworking of asynchronous transmission mode public network

The present invention relates to control of interworking for interworking of effective bit rate / asynchronous transmission mode block transmission capability in an asynchronous transfer mode (ATM) public network. In ITU-T SG13 Q.8, Recommendation I.371 provides a deterministic bit rate (ATM Transfer Capability), which is a deterministic bit rate (DBR), a statistical bit rate (SBR), an asynchronous transfer mode (ABT) and an effective bit rate (ABR) ATC) were defined.

Unlike the fixed bit rate (CBR) classified in the user service view and the variable bit rate (VBR) service, the asynchronous transmission mode transmission capabilities are classified in terms of transmission characteristics of the asynchronous transmission mode layer.

However, the Asynchronous Transfer Mode (ATM) Forum does not accept the Asynchronous Transfer Mode (ABT) transmission capability recommended by ITU-T, and the ITU-T does not accept the Unspecified Bit Rate UBR) are not yet defined in the Recommendation, so that different asynchronous transfer mode transmission capabilities are standardized in both standardization organizations.

Meanwhile, the user considers only the asynchronous transmission mode transmission capability (ATC) provided in the user network interface (UNI), but does not consider which asynchronous transmission mode transmission capability is provided in the public network.

In addition, the public network may not provide all of the asynchronous transmission mode transmission capabilities defined in the Recommendation.

Accordingly, the user may request an asynchronous transmission mode transmission capability not implemented in the public network. In this case, even though the switching system of the public network can not provide the asynchronous transmission mode transmission capability requested by the user, the quality of service (QoS) QoS), or a function of routing from a network management point of view.

Currently, ITU-T SG13 defines the implementation of a deterministic bit rate (DBR) as essential and recommends that all asynchronous transmission mode transmission capabilities be accommodated at a deterministic bit rate.

However, in this case, since the transmission band is allocated as the maximum transmission rate (Peak Cell Rate), the bandwidth utilization efficiency for the traffic having a large burst is lowered.

Especially, in the case of effective bit rate traffic, the effective bit rate characteristic is maintained in the private network to efficiently use the bandwidth. However, if the public bit rate is allocated to the public bit rate, the characteristic of the effective bit rate traffic can not be represented and the bandwidth becomes wasted.

Also, since the statistical bit rate (SBR) requires a sustained cell rate (SCR) and an intrinsic burst tolerance (IBT) as traffic parameters, it is difficult to accept an effective bit rate or an asynchronous transmission mode block transmission traffic.

Therefore, the effective bit rate or the asynchronous transmission mode block transmission must be implemented in the public network in terms of traffic characteristics and bandwidth utilization efficiency.

However, the effective bit rate and the asynchronous transmission mode block transmission are intended to support a bursty data transmission and can accommodate a user request service for the same purpose.

Therefore, only one of the effective bit rate and the asynchronous transmission mode block transmission can be implemented in the public network, and the other asynchronous transmission mode transmission capacity can be accommodated by the interoperability mechanism.

In this case, the asynchronous transmission mode block transmission, which can request the transmission rate in the source switching system, is more advantageous from the viewpoint of interoperability than the effective bit rate whose transmission rate is controlled by the control of the network in the public network.

However, the effective bit rate and the asynchronous transfer mode block transfer differ in the structure of the resource management cell used for each flow control and the flow control method.

Therefore, when a subscriber of a private network using an effective bit rate needs to pass through a public network having only an asynchronous transmission mode block transmission, an effective bit rate / asynchronous transmission mode block transmission (ABR / ABT) transmission Capability interoperability mechanisms are needed.

At this time, in the effective bit rate / asynchronous transfer mode block transmission (ABR / ABT) transmission capability interoperability mechanism, an effective bit rate resource management (ABR RM) cell must be converted into an asynchronous transfer mode block transmission resource management (ABT RM) Should also be converted.

Also, since the allowed bit rate (ACR), which is the transmission rate of the transmission source, is temporally variable according to the control of the network, the effective bit rate traffic is changed in the asynchronous transmission mode block transmission resource management flow controller, There is a problem that the block cell rate (BCR) of the block transmission traffic must be changed.

According to an aspect of the present invention, there is provided an interworking apparatus mounted on an asynchronous transfer mode (ATM) switching system, the interworking apparatus comprising: an effective bit rate (ABR) switching system for detecting a forward resource management cell A bit rate forward resource management cell detector; The effective bit rate forward resource management cell is received from the effective bit rate forward resource management cell detector and an effective bit rate reverse resource management cell is generated according to the parameter in the resource management cell to transmit the effective bit rate reverse resource management cell to the external effective bit rate switching system A bit rate reverse resource management cell generation unit; A buffer for receiving cells from the effective bit rate forward resource management cell detector and outputting the cells to another asynchronous transmission mode block transmission switching system; (BCR) bandwidth requesting resource management cell to the asynchronous transfer mode block transfer switching system by receiving an allowable cell ratio (ACR) parameter in the effective bit rate forward resource management cell from the effective bit rate forward resource management cell detection unit, The asynchronous transfer mode block transfer control unit configured to notify the block cell rate transfer rate to the buffer upon receipt of the block cell rate control resource management cell from the asynchronous transfer mode block transfer switching system of the interworking unit, A block cell rate bandwidth requesting resource management cell detector for detecting a block cell rate bandwidth requesting resource management cell among cells input from an external asynchronous transfer mode block transmission switching system; Upon receiving the block cell ratio bandwidth request resource management cell from the block cell ratio bandwidth requesting resource management cell detector, the currently available asynchronous transfer mode block transmission band status is examined to determine the block cell ratio (BCR) as the asynchronous transfer mode block transmission (ABT) An asynchronous transfer mode block transfer (ABT) band manager for transmitting a band acknowledgment resource management cell; A buffer for receiving cells from the BCR bandwidth requesting resource management cell detector and outputting the cells to an external effective bit rate (ABR) switching system; Counts the cells input from the external effective bit rate switching system into the effective bit rate reverse resource management cell and the buffer, and transmits the effective bit rate forward resource management cell to the effective bit rate switching system or controls the transmission rate of the buffer to the allowed cell ratio (ACR) And an interworking unit transmission unit configured to perform a virtual transmission source function.

In order to achieve the above object, the present invention provides a method for interworking with an interworking unit device mounted on an asynchronous transfer mode (ATM) switching system, the method comprising the steps of: transmitting an effective bit rate / asynchronous transfer mode block transmission (ABR / ABT) In an interworking method, when an effective bit rate forward resource management cell is received from an external effective bit rate (ABR) switching system, an effective bit rate reverse resource management cell is generated to transmit an effective bit rate reverse resource management cell to an external effective bit rate switching system Step 1; After performing the first step, an ACR parameter is extracted from an effective bit rate forward resource management cell, and an external relative asynchronous transfer mode block transmission (ABR / ABT) A second step of transmitting and terminating the cell; Upon receipt of a block cell ratio (BCR) bandwidth resource management cell from the external, asynchronous transfer mode block transmission switching system, the block cell rate bandwidth management resource management cell is transmitted again and the data cells in the buffer are transmitted at the block cell rate transmission rate A fourth step of performing a virtual receiver function and checking if a requested bandwidth can be allocated by receiving a block cell transmission bandwidth requesting resource management cell from an external asynchronous transmission mode block transmission switching system; ; If it is possible to allocate a bandwidth after the fourth step, allocating the requested bandwidth to the block cell rate and transmitting the block cell rate bandwidth management resource management cell; If the bandwidth allocation is not possible after the fourth step, allocating a bandwidth that can be allocated in the current system to the block cell rate, and transmitting and terminating the block cell rate bandwidth management resource management cell; Receiving an effective bit rate reverse resource management cell from the external effective bit rate (ABR) switching system; and controlling to transmit data cells in the buffer at an ACR transmission rate; And an eighth step of transmitting an effective bit rate forward resource management cell for every 32 data cells according to the effective bit rate flow control while performing the seventh step.

FIG. 1 is an overall configuration diagram of an asynchronous transfer mode (ATM) system in which the present invention is mounted; FIG.

FIG. 2 is a block diagram of a receiver of an interworking unit according to the present invention; FIG.

FIG. 3 is a configuration diagram of a transmitting unit of the interworking unit according to the present invention; FIG.

FIG. 4 is a flowchart of a control method of the interworking receiver according to the present invention;

FIG. 5 is a flowchart of a control method of an interworking transmission unit according to the present invention;

DESCRIPTION OF THE REFERENCE NUMERALS

10: Asynchronous Transfer Mode (ATM) switching system 11: Subscriber unit

12: asynchronous transfer mode (ATM) switch 13: call control device

14: Network matching device 15: Interworking unit

20: Interworking unit receiver

21: effective bit rate forward resource management cell detection unit

22: effective bit rate reverse resource management cell generation unit

23: Receiver Buffer

24: Asynchronous transfer mode block transfer flow control section

30: Interworking unit transmitter

31: Block cell ratio bandwidth request resource management cell detection unit

32: Asynchronous transmission mode block transmission bandwidth management unit

33: Transmitter buffer

34: Effective bit rate Flow control unit

The present invention relates to interworking control for interworking with an effective bit rate / asynchronous transmission mode block transmission (ABR / ABT) transmission capability of an asynchronous transfer mode (ATM) public network, and more particularly, As follows.

FIG. 1 is an overall configuration diagram of an asynchronous transfer mode (ATM) switching system 10 on which the present invention is mounted.

According to the above configuration, only the asynchronous transfer mode block transfer (ABR / ABT) flow control is implemented in the asynchronous transfer mode (ATM) exchange system 10 of the public network, so that the effective bit rate / asynchronous transfer mode block transfer (ABR / ABT) When the asynchronous transmission mode switching system 10 is to perform a virtual transmission source function for interworking transmission capability, an interworking unit transmission unit is mounted on the network matching apparatus 14 to transmit the asynchronous transmission mode block transmission (ABR / ABT) traffic To effective bit rate (ABR) traffic.

When it is necessary to perform the function of the virtual receiver according to the effective bit rate flow control after the conversion, the interworking unit receiver is mounted in the subscriber unit 11 to transmit the effective bit rate input traffic to the asynchronous (ABT) traffic, and delivers it to the correspondent node according to the asynchronous transfer mode block transfer flow control.

FIG. 2 is a block diagram of a receiving unit 20 of an interworking unit according to the present invention. The effective bit rate reverse resource management cell generation unit 22 detects an effective bit rate forward resource management cell from among cells input from an external effective bit rate switching system, To the effective bit rate forward resource management cell detector (21) for delivering the effective bit rate forward resource management cell to the asynchronous transmission mode block forwarding (ABT) flow control unit (24) )Wow; Receives an effective bit rate forward resource management cell from the effective bit rate forward resource management cell detector 21 and generates an effective bit rate reverse resource management cell according to a parameter in the resource management cell to generate an effective bit rate reverse resource management cell An effective bit rate reverse resource management cell generation unit 22 for transmitting the effective bit rate; A reception buffer 23 for receiving cells from the effective bit rate forward resource management cell detection unit 21 and outputting the cells to another asynchronous transmission mode block transmission (ABT) switching system and an effective bit rate forward resource management cell detection unit 21, (BCR) from an asynchronous transfer mode block transfer (ABT) switching system by receiving a block cell ratio bandwidth request resource management cell to an asynchronous transfer mode block transfer switch system by receiving an allowable cell ratio (ACR) And an asynchronous transfer mode block transfer flow control unit 24 for controlling the transfer rate of the buffer 23 at a block cell rate upon receipt of the bandwidth check resource management cell.

FIG. 3 is a block diagram of a transmitting unit of an interworking unit according to the present invention. The BCR bandwidth request resource management cell is detected from cells input from an external asynchronous transfer mode block transmission (ABT) switching system, A block cell rate bandwidth requesting resource management cell detecting unit 31 for transmitting the block cell rate bandwidth requesting resource management cell to the block transmission (ABT) band managing unit 32; Upon receiving the block cell ratio bandwidth request resource management cell from the block cell ratio bandwidth requesting resource management cell detection, the currently available bandwidth state is checked and the block cell ratio bandwidth is confirmed by the asynchronous transmission mode block transmission (ABT) switching system. An asynchronous transfer mode block transfer (ABT) band manager 32; A transmission buffer 33 for receiving cells from the block cell rate requesting resource management cell detector 31 and outputting the received cells to an external effective bit rate switching system and an effective bit rate reverse resource management cell and a buffer 33 And an effective bit rate flow control unit 34 for counting the cells input into the effective bit rate switching system and transmitting the effective bit rate forward resource management cell or controlling the transmission rate of the buffer 33 to the allowable cell ratio ACR .

FIG. 4 is a flowchart illustrating a method of controlling an interworking receiver according to the present invention. When an effective bit rate forward resource management cell is received from an external effective bit rate (ABR) switching system 401, an effective bit rate reverse resource management cell is generated 402, The effective bit rate reverse resource management cell is transmitted to the external effective bit rate switching system (403).

After the transmission, an allowed cell ratio (ACR) parameter is extracted in an effective bit rate forward resource management cell (step 404), and an outer relative asynchronous transmission mode block transmission switching system extracts a block cell ratio (BCR) The management cell is transmitted (405) and the process ends.

On the other hand, when receiving the block cell rate bandwidth confirmation resource management cell from the external relative asynchronous transfer mode block transmission (ABR / ABT) switching system (406), the block cell rate bandwidth confirmation resource management cell is transmitted again (407) Lt; / RTI > at a block cell rate transmission rate (408).

5 is a flowchart illustrating a method of controlling an interworking transmission unit according to the present invention. When a block cell ratio (BCR) bandwidth resource management cell is received (501) from an external relative asynchronous transfer mode block transmission (ABR / ABT) switching system, It is checked whether a bandwidth allocation is possible (502).

If the requested block cell rate band allocation is possible, the requested bandwidth is stored in the block cell ratio (503), the block cell rate bandwidth management resource management cell is transmitted (504), and the requested block cell rate bandwidth allocation If it is not possible, a band currently allocated to the block cell ratio is designated (505), and the block cell rate band confirmation resource management cell is transmitted (504).

On the other hand, when an effective bit rate reverse resource management cell is received from an external effective bit rate switching system 506, control is performed to transmit data cells in the buffer at an ACR transmission rate 507, (508) the effective bit rate forward resource management cell for every 32 data cells according to FIG.

The present invention configured to operate as described above includes interworking control for performing a virtual source and a virtual source function for effective bit rate traffic flow control when only asynchronous transfer mode block transmission (ABT) flow control is implemented in a public network The effective bit rate input traffic is converted into the asynchronous transmission mode block transmission traffic by using the effective bit rate / asynchronous transmission mode block transmission capability interoperability.

The present invention relates to a virtual source and a virtual destination for effective bit rate (ABR) flow control in an interworking unit of a public network switching system implemented only asynchronous transfer mode block transfer (ABR / ABT) (RM) cell input from an external effective bit rate switching system is terminated, an effective bit rate reverse resource management cell is transmitted to an effective bit rate switching system, an effective bit rate is extracted from a forward resource management cell Effective bit rate / asynchronous transfer mode for performing block transfer traffic control by generating a resource management cell that requires a bandwidth ratio (BCR) band of effective bit rate traffic according to a cell ratio (ACR) value; a block transfer (ABR / ABT) And to provide an interoperability method.

Claims (4)

An interworking control apparatus, which is respectively installed in a plurality of subscriber matching apparatuses and a network matching apparatus in an asynchronous transfer mode (ATM) switching system, the interworking control apparatus comprising: an effective bit rate forward resource management RM) cell of the forward resource management cell; An effective bit rate reverse resource management cell for receiving an effective bit rate forward resource management cell from the cell detecting unit and generating an effective bit rate reverse resource management cell according to a parameter in the resource management cell and transmitting an effective bit rate reverse resource management cell to an external effective bit rate switching system; A generating unit; A buffer for receiving cells from the effective bit rate forward resource management cell detector and outputting the cells to another asynchronous transmission mode block transmission (ABT) switching system; (BCR) bandwidth request resource management cell to the asynchronous transfer mode block transfer switching system by receiving the valid bit from the allowable cell ratio (ACR) parameter in the forward resource management cell of the forward resource management cell rotor effective bit rate, And an asynchronous transfer mode block transfer flow controller for notifying the block cell rate transfer rate to the buffer when receiving the block cell rate band acknowledgment resource management cell from the asynchronous transfer mode block transfer switching system, An Interworking Control Device for ABR / ABT Transmission Capability Interworking of ATM Public Networks. An interworking control device, which is respectively installed in a plurality of subscriber-mating devices and network adapters in an asynchronous transfer mode (ATM) switching system, characterized by comprising: means for selecting one of the cells input from an external asynchronous transfer mode block transfer (ABT) (BCR) bandwidth request resource management (RM) cell; An asynchronous transmission mode block transmission band management unit for receiving a block cell rate bandwidth requesting resource management cell from the cell detection unit and transmitting a block cell rate bandwidth control resource management cell to an asynchronous transmission mode block transmission switching system by checking a currently available bandwidth state; A buffer for receiving cells from the block cell rate bandwidth requesting resource management cell detector and outputting the cells to an external effective bit rate switching system; Counts the cells input from the external effective bit rate switching system into the effective bit rate reverse resource management cell and the buffer, and transmits the effective bit rate forward resource management cell to the effective bit rate switching system or controls the transmission rate of the buffer to the allowed cell ratio (ACR) And an interworking unit transmitter configured to perform a virtual transmission source function, the interworking unit transmitting an ABR / ABT transmission capability interworking function of an asynchronous transmission mode ATM network. Effective bit rate / asynchronous transmission mode Block transmission (ABR / ABT) transmission capability applied to interworking control devices respectively installed in a plurality of subscriber matching devices and network matching devices in an asynchronous transfer mode (ATM) switching system Interworking for interoperability A first step of generating an effective bit rate reverse resource management cell and transmitting an effective bit rate reverse resource management cell to an external effective bit rate switching system upon receiving an effective bit rate forward resource management cell from an external effective bit rate (ABR) switching system; Wow; (BCR) bandwidth requesting resource management cell to an external relative asynchronous transfer mode block transmission (ABR / ABT) switching system by extracting an allowed cell ratio (ACR) parameter within the transmitted effective bit rate forward resource management cell A second step of terminating the process; Upon receipt of the block cell rate control resource management cell from the external relative asynchronous transfer mode block transmission switching system, the control unit controls the block cell rate control resource management cell to be transmitted again and the data cells in the buffer to be transmitted at the block cell rate transmission rate (ABR) transmission capability interworking of an asynchronous transfer mode (ATM) public network, wherein the virtual source function is performed, including the third step. An interworking method for effective bit rate / asynchronous transfer mode block transmission (ABR / ABT) interworking applied to interworking unit devices mounted in a plurality of subscriber matching devices and network adapters in an asynchronous transfer mode (ATM) A fourth step of determining whether a requested bandwidth allocation is possible upon receiving a block cell ratio (BCR) bandwidth request resource management cell from an external relative asynchronous transfer mode block transfer (ABT) switching system; If it is possible to allocate a bandwidth after the fourth step, allocating the requested bandwidth to the block cell rate and transmitting the block cell rate bandwidth management resource management cell; If the bandwidth allocation is not possible after the fourth step, allocating a bandwidth that can be allocated in the current system to the block cell rate, and transmitting and terminating the block cell rate bandwidth management resource management cell; Receiving an effective bit rate reverse resource management cell from an external effective bit rate switching system, and controlling the data cells in the buffer to be transmitted at an ACR transmission rate; And an eighth step of transmitting the effective bit rate downlink resource control cell for every 32 data cells according to the effective bit rate flow control in the seventh step of performing the virtual transmission source function. Interworking Control Method for ABR / ABT Transmission Capability Interoperability.