KR20020054447A - Device and method of routing aal 2/5 cell in mobile communication system - Google Patents

Abstract

The present invention relates to a routing interface apparatus and method for processing AAL 2/5 cells in a mobile communication system capable of performing AAL2 / 5 cell processing in a board mounted on a low speed subscriber matching block and a base station ATM network block of an ATM network. . In the mobile communication system according to the present invention, a routing interface apparatus for processing AAL 2/5 cells includes an E1 physical interface for interfacing a cell to be inputted and outputted at a first predetermined rate; An FPGA for an STM-1 transmission interface that receives a cell output from the E1 physical interface and sets a transmission path; A transmission AAL2 protocol processor for converting a protocol of a cell received in the FPGA for the STM-1 transmission interface; An STM-1 physical interface for interfacing cells output from the FPGA for the STM-1 transmission interface to be transmitted at a second predetermined rate; An STM-1 receive interface FPGA for setting a receive path of a cell output from the STM-1 physical interface, and a receive AAL2 protocol processor for converting a protocol of a cell received in the STM-1 receive interface FPGA; It is connected to the FPGA for the STM-1 receive interface and the FPGA for the STM-1 transmit interface, and comprises a memory unit for storing a value for each communication path and information about a cell.

Description

Routing interface device and method for processing AL2 / 5 cell in mobile communication system {DEVICE AND METHOD OF ROUTING AAL 2/5 CELL IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a routing interface apparatus and method for processing AAL 2/5 cells in a mobile communication system, and more particularly, to routing for processing AAL2 / 5 cells in a board mounted in a low speed subscriber matching block and a base station ATM network block of an ATM network. A routing interface apparatus and method for processing AAL 2/5 cells in a mobile communication system is disclosed.

Currently, a routing interface device for processing AAL 2/5 cells has not yet been developed in a mobile communication system such as IMT-2000, and each communication equipment manufacturer is under development to provide various kinds of services under an IMT-2000 system environment. have.

If a routing interface technology for processing AAL 2/5 cells is provided in a mobile communication system under an IMT-2000 system environment, a variable bit rate that is efficient for transmitting compressed video or audio along with an AAL5 protocol for multicasting is provided. The AAL2 protocol can be used at the same time, and the cells belonging to the AAL2 and 5 protocols can be effectively routed, thereby increasing the efficiency of network resources.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art mentioned above and to meet the same industry expectations as mentioned above, and includes AAL2 in a low speed subscriber matching block of an ATM network and a board mounted in a base station ATM network block. The present invention provides a routing interface apparatus and method for processing AAL 2/5 cells in a mobile communication system capable of performing / 5 cell processing.

1 is a block diagram of a routing interface device for processing AAL 2/5 cells according to the present invention;

2 is an explanatory diagram for explaining the operation of FIG.

3A and 3B show registers when the input / output register format and ATM adaptation layer information of the memory of FIG. 2 are included;

4 is a control flow diagram for establishing a traffic path using SVC in a routing interface for ATM adaptation layer 2/5 cell processing according to the present invention;

* Description of the symbols for the main parts of the drawings *

1: E1 physical interface

2, 6: First-in, first-out buffer

3: FPGA for STM-1 Receive Interface

4, 11: AAL2 protocol processor

5: Backbone

7, 8: memory

9: STM-1 physical interface

10: FPGA for STM-1 Transmit Interface

13: central processing unit

21a ~ 21n: E1 / T1 matching part

23: STM-1 matching part

In order to achieve the above object, in the mobile communication system according to the present invention, a routing interface device for processing AAL 2/5 cells includes an E1 physical interface for interfacing a cell to be inputted and outputted at a first predetermined rate; An FPGA for an STM-1 transmission interface that receives a cell output from the E1 physical interface and sets a transmission path; A transmission AAL2 protocol processor for converting a protocol of a cell received in the FPGA for the STM-1 transmission interface; An STM-1 physical interface for interfacing cells output from the FPGA for the STM-1 transmission interface to be transmitted at a second predetermined rate; An STM-1 receive interface FPGA for setting a receive path of a cell output from the STM-1 physical interface, and a receive AAL2 protocol processor for converting a protocol of a cell received in the STM-1 receive interface FPGA; It is connected to the FPGA for the STM-1 receive interface and the FPGA for the STM-1 transmit interface, and comprises a memory unit for storing a value for each communication path and information about a cell.

In addition, a routing interface method for processing AAL 2/5 cells in a mobile communication system includes: setting a switched virtual circuit (SVC) according to a control signal and determining whether a cell is introduced; Extracting a VP / VC from a header of the cell when a cell is introduced as a result of the determination; Determining whether the extracted VP / VC value and the VP / VC value stored in the memory unit coincide with each other; As a result of the determination, if there is a matching VP / VC, the output VP / VC is updated in the header of the cell, and directly transmitted or converted and transmitted according to the type of the cell.

Hereinafter, with reference to the accompanying drawings will be described the configuration and operation of the present invention.

1 is a block diagram of a routing interface device for processing AAL 2/5 cells according to the present invention.

Referring to FIG. 1, a routing interface device for processing AAL 2/5 cells of the present invention includes an E1 physical interface (1) for interfacing a cell to be inputted and outputted at a rate of 2.048 bps, and an E1 physical interface ( A transmission protocol AAL2 protocol processor for converting the protocol of the cell received in the STM-1 transmission interface FPGA 10 for receiving a cell output from 1) and setting a transmission path. 11, the STM-1 physical interface 9 for interfacing the cells output from the STM-1 transmission interface FPGA 10 to be transmitted at a rate of 155 Mbps, and the output signals of the STM-1 physical interface 9 A first-in-first-out buffer 2 for temporary storage, an STM-1 receiving interface FPGA 3 for setting a reception path of a cell output from the first-in-first-out buffer 2, and an FPGA for an STM-1 receiving interface. (3) reception to convert the protocol of the received cell AAL2 protocol processor (4), a first memory (7) and a second memory (8), and stores values for communication paths and information about cells, FPGA for STM-1 receive interface (3 And the memory unit 12 connected to the FPGA 10 for the STM-1 transmission interface to perform specific pre-stored functions, the E1 physical interface 1 and the STM-1 physical interface and the entire board. It consists of a central processing unit (13) in charge of repair.

In the present invention, the low speed subscriber matching block is accommodated in the control station and the base station ATM network block in the base station. Each of these blocks has 16 T1 / E1 matches and one STM-1 match and is equipped with a device as shown in FIG. 1 for VP / VC conversion of ATM cells and AAL2 cell processing.

The interfacing apparatus shown in FIG. 1 performs AAL5 cell processing, and AAL2 cell processing is processed by the AAL2 protocol processor 4,11. Therefore, the section in which the AAL2 cell moves is a path from the E1 / T1 section to the AAL2 protocol processors 4 and 11.

Hereinafter, the operation of the routing interface device for processing AAL 2/5 cells in the same mobile communication system will be described.

2 is a view for explaining the operation of FIG.

Referring to FIG. 2, AAL2 or AAL5 cells are introduced from the T1 / E1 matching units 21a to 21n. The FPGA 10 for the STM-1 interface refers to the memory unit 12 through a control command and determines that the input cell belongs to any layer of AAL2 and AAL5.

If the cell to which the determination result is input is an AAL2 cell, the AAL2 protocol processor 11 converts the cell into AAL5 through cell processing, and transmits the higher level through the STM-1 link. However, if the input cell is an AAL5 cell, it is immediately transmitted to the upper end without conversion.

Therefore, the cell flowing from the STM-1 matching section 23 is an AAL5 or AAL5 'cell. Here, the AAL5 'cell refers to a cell in which AAL2 is converted.

These cells are transferred to the E1 / T1 link through the E1 / T1 matching units 21a to 21n in the case of the AAL5 cell by referring to the memory unit 12 through the FPGA 3 for the STM-1 receiving interface. On the other hand, in the case of the AAL5 'cell, it is converted to AAL2 through the AAL2 protocol processor 4 and then transmitted to the E1 / T1 link.

The configuration of the input / output registers of the memory unit 12 for routing the AAL2 cell and the AAL5 cell is shown in FIGS. 3A and 3B, and the configuration procedure is as shown in FIG. 4.

That is, as shown in Figure 3, the input and output registers of the memory unit 12 is composed of a total of 64 bits to store the VP / VC conversion table, extract the VPI / VCI included in the header of the ATM cell to proceed The usefulness of the cell is determined by comparing the data stored in the memory unit 12.

The I / O register consists of four 16-bit registers, all 16 bits for the VC and 8 bits for the VP. Therefore, 16 bits of free space are created, so this area is used to manage ATM adaptation layer information.

In FIG. 3, a portion indicated by 'A' is a field for storing ATM adaptation layer information, 'O' is an OAM cell, and 'LID' is a field for managing a link identifier (ID) for T1 / E1. Routing to AAL2 / 5 is used when using Switched Virtual Circuit (SVC).

In order to establish a traffic path using SVC, a control signal including an SVC table must be transmitted from an upper process. This control signal contains a VP / VC value to be written to the memory unit 12 and information on the ATM adaptation layer.

4 is a control flowchart for establishing a traffic path using SVC in a routing interface for AAL 2/5 cell processing according to the present invention.

First, the SVC is set by the control signal. Subsequently, the cell to be processed in the board to which the present invention is applied stores "00" in the "A" field of the memory unit 12 and stores information on the VP / VC (S101). The cell to be processed in the AAL2 protocol processor 4 and 11 stores "01" in the 'A' field and stores information on the VP / VC.

Subsequently, it is determined whether there is an incoming cell after the SVC path is established (S102). If there is an incoming cell as a result of the determination, VP / VC is extracted from the header of the cell (S103).

Subsequently, it is determined whether the VP / VC value stored in the memory unit 12 and the extracted VP / VC value coincide with the extracted VP / VC value (S104).

As a result of the determination, if there is a matching VP / VC, the output VP / VC is updated in the cell header (S105).

Subsequently, at the same time as the update, the value of the 'A' field is read to determine whether to transmit the cell to the AAL2 protocol processor 4 or directly process it. That is, it is determined whether the cell to be transmitted is an AAL2 cell or an AAL5 cell (S106). If it is determined that the AAL2 cell is to be transmitted to the AAL2 protocol processor 4, 1 byte is added to the 53-byte ATM cell format and the ATM adaptation layer information and the information (LID) read from the memory unit 12 are attached. (S107).

Subsequently, the AAL2 protocol processor 4 receives 54 bytes of data, performs an ATM adaptation layer conversion operation, and then transmits the converted cell to the destination (S108).

According to the routing interface apparatus and method for processing AAL 2/5 cells in the mobile communication system according to the present invention described above, a variable bit rate that is efficient for transmitting compressed video or audio together with the AAL5 protocol for multicasting is advantageous. It is effective to use AAL2 protocol simultaneously. In addition, since the cells belonging to the AAL2,5 protocol can be efficiently routed, network resource efficiency can be improved.

Claims (3)

An E1 physical interface for interfacing the input / output cell to be transmitted at a first predetermined rate; An FPGA for an STM-1 transmission interface that receives a cell output from the E1 physical interface and sets a transmission path; A transmission AAL2 protocol processor for converting a protocol of a cell received in the FPGA for the STM-1 transmission interface; An STM-1 physical interface for interfacing cells output from the FPGA for the STM-1 transmission interface to be transmitted at a second predetermined rate; An FPGA for an STM-1 receive interface configured to set a receive path of a cell output from the STM-1 physical interface: A receiving AAL2 protocol processor for converting a protocol of a cell received in the STM-1 receiving interface FPGA; AAL 2/5 cells in the mobile communication system, which is connected to the FPGA for the STM-1 receive interface and the FPGA for the STM-1 transmit interface, comprising a memory unit for storing values for each communication path and information about the cells. Routing interface device for processing. Setting a switched virtual circuit (SVC) according to a control signal, and determining whether a cell is introduced; Extracting a VP / VC from a header of the cell when a cell is introduced as a result of the determination; Determining whether the extracted VP / VC value and the VP / VC value stored in the memory unit coincide with each other; As a result of the determination, if there is a matching VP / VC, the output VP / VC is updated in the header of the cell, and directly transmitted or converted according to the type of the cell. / 5 Routing interface method for cell processing. The mobile station of claim 2, wherein when the cell is an AAL2 cell, 1 byte is added to an ATM cell format to transmit ATM adaptation layer information and information (LID) read from the memory unit. Routing interface method for processing AAL 2/5 cells in a communication system.