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    • 专利摘要:
    The present invention relates to a method of utilizing VPI and VCI of an internal switching cell of an ATM switching system. The method of utilizing VPI and VCI of an internal switching cell of an ATM switching system according to the present invention includes a reception line matching device, an input cell processing device, and a switch input matching. A VPI and a VCI utilization method of an internal switching cell of an ATM switching system including a device, a switch device, a switch output matching device, an output cell processing device, and a transmission line matching device, wherein the virtual path conversion table of the input cell processing device is used. (A) converting the ATM cell into an internal switching cell by replacing VPI and VCI of the ATM cell header region extracted by the reception line matching device with the switch output port number and the virtual path conversion table address; (B) receiving, by the switch input matching device, the internal switching cell converted in the step (a) from the input cell processing device and inputting it to the switch device; (C) outputting the output port to the corresponding output port by the switch device by setting the path of the output port by the switch output port number of the internal switching cell input to the switch device in the step (b); (D) converting, by the output cell processor, the internal switching cell output in step (c) into a ATM cell for transmission by granting a new VPI and VCI by a virtual path conversion table address; And (e) transmitting, by the transmission line matching device, a transmission ATM line to which a new VPI and VCI have been assigned in step (d) through a physical layer and a convergence layer process. According to the method of using the VPI, VCI of the internal switching cell in the ATM switching system according to the present invention, by using the VPI, VCI region of the internal switching cell to efficiently display and manage the path information of the internal switching cell, the switch input matching device In addition, the structure of the switching unit including the switch device and the switch output matching device can be simplified, thereby simplifying the implementation of multicasting and broadcasting. That is, since the cells transmitted and received by the switch input matching device and the switch output matching device are ATM standard cell types, standardized convergence layer and physical layer processing processes can be used, and various structural designs can be made according to system or network configuration. . In addition, multicasting and broadcasting functions through cell copying can be easily implemented. By allocating the virtual path translation table address area as necessary, the size of the virtual path translation table can be efficiently managed.
    公开号:KR20020025525A
    申请号:KR1020000057418
    申请日:2000-09-29
    公开日:2002-04-04
    发明作者:이태재
    申请人:구자홍；엘지전자주식회사；
    IPC主号:
    专利说明:

    {Method for Broadcasting and Multicasting using the VPI and VCI of switching cell in ATM Switching System} in asynchronous transmission mode switching system
    [14] The present invention relates to a method for utilizing a virtual path identifier (hereinafter referred to as 'VPI') and a virtual channel identifier (hereinafter referred to as 'VCI') of an internal switching cell in an asynchronous transmission mode (hereinafter referred to as 'ATM') switching system. In this regard, by efficiently displaying and managing path information of an internal switching cell using the VPI and VCI areas of the internal switching cell, the structure of the switching unit including the switch input matching device, the switching device, and the switch output matching device can be simplified. In this regard, the present invention relates to a method for easily implementing multicasting and broadcasting.
    [15] 1 is a block diagram illustrating a conventional ATM switching system including a receiving line matching device, an input cell processing device, a switch input matching device, a switching device, a switch output matching device, an output cell processing device, and a transmission line matching device.
    [16] The conventional ATM switching system includes a receiving line matching device 10, an input cell processing device 11, a switch input matching device 12, a switch device 13, a switch output matching device 14, and an output cell processing device 15. ), And a transmission line matching device 16. In the ATM protocol layer model, the input cell processing unit 11, the switch input matching unit 12, the switch unit 13, the switch output matching unit 14, and the output cell processing unit 15 process the ATM layer. In addition, the reception line matching device 10 and the transmission line matching device 16 process a physical layer and a convergence layer.
    [17] Receiving line matching device 10 describes the ATM protocol layer model, and processes the physical layer and convergence layer of the receiving line. 2A shows the shape of a cell extracted from the receiving line matching device 10.
    [18] The input cell processing apparatus 11 assigns a routing tag with a new VCI and VPI according to VPI and VCI located in the header region of the cell extracted through the reception line matching apparatus 10. In FIG. 2B, the shape of the cell processed by the input cell processor 11 is shown. In FIG. 2E, the virtual path conversion table provided in the input cell processor 11 and the output cell processor 15 is implemented. An example is shown.
    [19] The switch input matching device 12 is responsible for cell transfer between the input cell processing device 11 and the switch device 13.
    [20] The switch device 13 provides a path according to the routing tag information of the cell.
    [21] The switch output matching device 14 is responsible for cell transfer between the switch device 13 and the output cell processing device 15. 2C shows the form of the cell transmitted from the switch device 13 to the output cell processing device 15 via the switch output matching device 14.
    [22] The output cell processing unit 15 performs VPI and VCI conversion to give a new virtual path to the output cell. FIG. 2D shows the shape of the cell transmitted from the output cell processing device 15 to the transmission line matching device 16. In FIG. 2E, the input cell processing device 11 and the output cell processing device 15 are shown. An embodiment of a virtual path translation table provided at is shown.
    [23] The transmission line matching device 16 transmits the cell output from the output cell processing device 15 to the transmission line through the physical layer and convergence layer processing of the ATM protocol layer model.
    [24] 2A, 2B, 2C, 2D and 2E illustrate the processing of an internal switching cell by a conventional ATM switching system. Reference is made to the reference numerals of FIG. 1 to describe FIGS. 2A, 2B, 2C, 2D and 2E.
    [25] 2A illustrates the shape of a cell extracted from the receiving line matching device 10, and FIG. 2B illustrates the shape of a cell processed by the input cell processing device 11. In FIG. 2C, the switch device (eg, through the switch output matching device 14) is used. 13 is a form of a cell transmitted from the output cell processing apparatus 15 to FIG. 2D, a form of a cell transmitted from the output cell processing apparatus 15 to the transmission line matching device 16, and FIG. 2E is a representation of the input cell processing. An embodiment of a virtual path translation table provided in the device 11 and the output cell processing device 15 is shown.
    [26] The ATM cell extracted through the reception line matching device 10 is composed of a 48-byte payload and a 5-byte header, as shown in FIG. 2A. The extracted ATM cell is converted into a VPI and VCI of the cell header area shown in FIG. 2A by the virtual path conversion table of the input cell processing apparatus 11 in the form as shown in FIG. 2B. As shown in FIG. 2E, the virtual path conversion table of the input cell processor 11 is configured to convert VPI and VCI of the extracted ATM cell header area into new VPI and VCI, and to provide routing tag information. It is. Typically, an ATM cell as shown in FIG. 2B is called an internal switching cell.
    [27] In more detail, the process “201” of FIG. 2A corresponds to “241” of FIG. 2E, and “242” and “243” corresponding to “241” replace “201” of FIG. 2A. Converted to an internal switching cell as shown in FIG. 2B.
    [28] The switch input matching device 12 processes the process of inputting the internal switching cell to the switch device 13, and the processing thereof depends on the type of the internal switching cell.
    [29] The switch device 13 provides a path according to the routing tag information of the internal switching cell. The operation process is closely related to the type of the routing tag information and the switch structure, and depends on the type of the internal switching cell. The switching device 13 also performs copying, multicasting and broadcasting of the cell.
    [30] The internal switching cell output from the switch device 13 is sent to the output cell processing device 15 via the switch output matching device 14, and a process similar to that performed by the input cell processing device 11 is performed. Is performed. The output internal switching cell is converted into the VPI and VCI of the cell header area shown in FIG. 2C by the virtual path conversion table of the output cell processing device 15 in the form as shown in FIG. 2D. As shown in FIG. 2E, the virtual path conversion table of the output cell processing device 15 is configured with information for converting the VPI and VCI of the output internal switching cell header area into a new VPI and VCI.
    [31] In more detail, the internal switching cell output from the switch device 13 becomes a cell without routing tag information as shown in FIG. 2C, where "221" is changed to a value such as "212". There is no "221" corresponds to "251" in FIG. 2E, and "252" corresponding to "251" replaces "221", resulting in an ATM cell as shown in FIG. 2D.
    [32] Through the above process, VPI and VCI corresponding to "243" of FIG. 2E are converted into VPI and VCI corresponding to "252".
    [33] As described above, the switch input matching device 12 has a very different structure and operation depending on the shape of the internal switching cell, and thus, it is difficult to implement the switch input matching device 12 using a standardized physical layer. In addition, the virtual condensation conversion table address area of the output cell processing device 15 is inefficiently disadvantageous.
    [34] An object of the present invention is to solve the above problems, by utilizing the VPI, VCI region of the internal switching cell to efficiently display and manage the path information of the internal switching cell, the switch input matching device, switch device and switch output matching device It is possible to simplify the structure of the switching unit including, thereby providing a way to easily implement multicasting and broadcasting.
    [1] 1 is a block diagram showing a conventional ATM switching system consisting of a receiving line matching device, an input cell processing device, a switch input matching device, a switching device, a switch output matching device, an output cell processing device, and a transmission line matching device.
    [2] Figure 2a shows the form of the cell extracted from the receiving line matching device of the conventional ATM switching system,
    [3] Figure 2b shows the shape of the cell processed in the input cell processing apparatus of the conventional ATM switching system,
    [4] Figure 2c shows the form of the cell transmitted from the switch to the output cell processing unit through the switch output matching device of the conventional ATM switching system,
    [5] Figure 2d shows the form of a cell transmitted from the output cell processing threshold of the conventional ATM switching system to the transmission line matching device,
    [6] 2E is an exemplary diagram illustrating a virtual path conversion table provided in an input cell processor and an output cell processor of a conventional ATM switching system.
    [7] Figure 3a shows the configuration of an ATM switching system in which the present invention is implemented,
    [8] Figure 3b is an embodiment according to the present invention, showing the shape of a cell extracted from the receiving line matching device,
    [9] 3C is an exemplary diagram illustrating a virtual path conversion table of an input cell processing apparatus and a virtual path conversion table of an output cell processing apparatus according to an embodiment of the present invention.
    [10] Figure 3d is an embodiment according to the present invention, showing the form of the cell output from the input cell processing device and the switch device,
    [11] 3E illustrates an embodiment of a cell transmitted from an output cell processing threshold to a transmission line matching device according to an embodiment of the present invention.
    [12] 4 is an exemplary view illustrating a structure of a switch output port number as an embodiment of the present invention.
    [13] FIG. 5 illustrates an example in which a switch output port number and a virtual path translation table address replace VPI and VCI located in an ATM cell header area according to an embodiment of the present invention.
    [35] In order to achieve the object as described above, VPI, VCI utilization method of the switching cell in the ATM switching system according to the present invention, the receiving line matching device, input cell processing device, switch input matching device, switch device, switch output matching device And a VPI and VCI utilization method of an internal switching cell in an ATM switching system including an output cell processing unit and a transmission line matching unit, wherein the ATM cell header extracted by the reception line matching unit is extracted by a virtual path conversion table of the input cell processing unit. (A) converting an ATM cell into an internal switching cell by replacing VPI and VCI of an area with a switch output port number and a virtual path translation table address; (B) receiving, by the switch input matching device, the internal switching cell converted in the step (a) from the input cell processing device and inputting it to the switch device; (C) outputting the output port to the corresponding output port by the switch device by setting the path of the output port by the switch output port number of the internal switching cell input to the switch device in the step (b); (D) converting, by the output cell processor, the internal switching cell output in step (c) into a ATM cell for transmission by granting a new VPI and VCI by a virtual path conversion table address; And (e) transmitting, by the transmission line matching device, a transmission ATM line to which a new VPI and VCI have been assigned in step (d) through a physical layer and a convergence layer process.
    [36] Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.
    [37] Prior to the detailed description, terms used below will be described in order to explain how to use VPI and VCI of an internal switching cell in an ATM switching system according to the present invention.
    [38] 'Output Port Number' is used to replace routing tag information of a conventional virtual path conversion table and is used as information for path setting in a switch device. The position value of the bit indicates the output port of the switch device, and when set to "1", the cell is output to the port.
    [39] The 'Virtual Connection eXchange Table Address' replaces the routing tag information of the conventional virtual path conversion table and the VPI and VCI information of the internal switching cell, and the cell copy count value and the VPI and VCI of the transmitted cell. It means the address of the virtual path conversion table of the output cell processing apparatus that stores the.
    [40] 3A, 3B, 3C, 3D and 3E illustrate an internal switching cell processing by an ATM switching system as an embodiment of the present invention.
    [41] FIG. 3A illustrates a configuration of an ATM switching system in which the present invention is implemented. FIG. 3B illustrates an embodiment of a cell extracted from a receiving line matching device according to an embodiment of the present invention, and FIG. 3C illustrates the present invention. By way of example, the virtual path conversion table of the input cell processing apparatus and the virtual path conversion table of the output cell processing apparatus are illustrated. FIG. 3D is an embodiment of the present invention. Figure 3e shows the form of the cell output from the switch device, Figure 3e shows the form of the cell transmitted from the output cell processing threshold to the transmission line matching device as an embodiment of the present invention.
    [42] The ATM switching system shown in FIG. 3A has the same structure as the conventional ATM switching system shown in FIG. However, operations of the input cell processing unit 21, the switch input matching unit 22, the switch unit 23, and the output cell processing unit 25 of the ATM switching system to which the present invention is implemented are different from those of the conventional ATM switching system. . In addition, the structure of the virtual path conversion table provided in the input cell processing unit 21 and the output cell processing unit 25 is different from the conventional ATM switching system as shown in FIG. 3C.
    [43] The ATM cell extracted through the reception line matching device 20 is composed of a 48-byte payload and a 5-byte header, as shown in FIG. 3B. The extracted ATM cell is converted into the VPI and VCI of the cell header area shown in FIG. 3B by the virtual path conversion table of the input cell processing apparatus 21 in the form as shown in FIG. 3D. As shown in FIG. 3C, the virtual path translation table of the input cell processing apparatus 21 converts the VPI and VCI of the extracted ATM cell header area into a switch output port number and a virtual path translation table address.
    [44] In FIG. 3D, the switch output port number is composed of the first 16 bits of the ATM cell header area, which is an ATM cell header configuration in an ATM switching system in which the switch device 23 has 16 output ports. 5 shows an ATM cell header configuration according to the number of output ports. As the switch output port number is 148A (H) 312, bit 2, 4, 8, 11, and 13 are '1' as shown in FIG. 4, output port 2 of switch device, 4 Information for routing inside the switch device 23 that the internal switching cell should be output to the output port # 1, the output port # 8, the output port # 11, and the output port # 13.
    [45] The switch input matching device 22 receives the internal switching cell from the input cell processing device and inputs it to the switch device 23. The switch device 23 sets the path to the output port corresponding to the bit position set to '1' according to the switch output port number.
    [46] In more detail, the process of "301" of FIG. 3B corresponds to "311" of FIG. 3C, and "312" and "313" corresponding to "311" replace "301" of FIG. 3B, Converted to an internal switching cell as shown in FIG. 3D.
    [47] The internal switching cell output from the switch device 23 is sent to the output cell processing device 25 via the switch output matching device 24, and the output cell processing device newly grants VPI and VCI for the cell for transmission. The cell copy made at the output port of the switch device 23 is made at the output cell processing device 25. The transmission cell newly assigned the VPI and VCI is transmitted by the transmission line matching device 26 through the physical layer and convergence layer processing.
    [48] In more detail, the internal switching cell received from the switch device 23 to the output cell processing device 25 is as shown in FIG. 3D, and "332" is provided in the output cell processing device 25. Corresponds to "321" of the converted virtual path conversion table. The output cell processor 25 reads the value of "323" by referring to "322" corresponding to "321", and transmits the switch output port number and the virtual path conversion table address of the internal switching cell to the VPI for the ATM cell. And the VCI is converted into a transmission ATM cell as shown in Fig. 3E. In FIG. 3C, since "322" is 1, only one VCI and VPI are read from "323". Then, the read VPI and VCI are replaced with "331" and "332" in FIG. 3D and converted into a transmission ATM cell as shown in FIG. 3E. When " 322 " is 2 or more, cell copy is performed by reading the VPI and VCI corresponding to the number, and the copied cell is transmitted.
    [49] 4 is an exemplary view illustrating a structure of a switch output port number as an embodiment of the present invention.
    [50] In an ATM switching system having 16 output ports, a 16-bit switch output port number indicates each output port to which an internal switching cell is to be output. The position value of each bit indicates the output port of the switch device, and when set to "1", it means that the internal switching cell is output to the corresponding output port. Therefore, it is very easy to implement multicasting and brocasting by the output port of the switch device.
    [51] FIG. 5 illustrates an example in which a switch output port number and a virtual path translation table address replace VPI and VCI located in an ATM cell header area according to an embodiment of the present invention.
    [52] The 5-byte header area can flexibly adjust the switch output port number and the virtual path translation table address according to the number of output ports of the ATM switching system. When there are eight output ports, the switch output port number can determine the output port by 8 bits, and when the output ports are 16, the output port can be determined by 16 bits. The switch output port number is determined by the number of output ports, thereby dynamically determining the virtual path translation table address. The position occupied by the switch output port number and the virtual path translation table address in the ATM cell header area may be configured differently according to the ATM switching system.
    [53] As described above, according to the method of using VPI and VCI of the internal switching cell in the ATM switching system according to the present invention, by efficiently displaying and managing path information of the internal switching cell by using the VPI and VCI regions of the internal switching cell. In addition, the structure of the switching unit including the switch input matching device, the switch device, and the switch output matching device can be simplified, thereby simplifying the implementation of multicasting and broadcasting. That is, since the cells transmitted and received by the switch input matching device and the switch output matching device are ATM standard cell types, standardized convergence layer and physical layer processing processes can be used, and various structural designs can be made according to system or network configuration. . In addition, multicasting and broadcasting functions through cell copying can be easily implemented. By allocating the virtual path translation table address area as necessary, the size of the virtual path translation table can be efficiently managed.
    权利要求:
    Claims (6)
    [1" claim-type="Currently amended] In the method using the VPI, VCI of the switching cell in the ATM switching system consisting of a receiving line matching device, an input cell processing device, a switch input matching device, a switch device, a switch output matching device, an output cell processing device and a transmission line matching device,
    Converting an ATM cell into an internal switching cell by replacing VPI and VCI of an ATM cell header area extracted by the receiving line matching device with a switch output port number and a virtual path conversion table address by a virtual path conversion table of the input cell processing device Step (a);
    (B) receiving, by the switch input matching device, the internal switching cell converted in the step (a) from the input cell processing device and inputting it to the switch device;
    (C) outputting the output port to the corresponding output port by the switch device by setting the path of the output port by the switch output port number of the internal switching cell input to the switch device in the step (b);
    (D) converting the internal switching cell output in step (c) into a transmission ATM cell by assigning a new VPI and VCI based on a switch output port number and a virtual path conversion table address; And
    In step (d), a transmission line matching device transmits an ATM cell to which a new VPI and VCI are granted, through a physical layer and a convergence layer process. How to use VPI and VCI in switching cells.
    [2" claim-type="Currently amended] The method of claim 1,
    In step (a), the ATM switching comprises replacing the VPI and VCI of the ATM cell header area with the switch output port number and the virtual path translation table address of the virtual path translation table corresponding to the VPI and VCI of the ATM cell header area. How to use VPI, VCI of internal switching cell in system.
    [3" claim-type="Currently amended] The method of claim 1,
    In the step (c), the switch device in the ATM switching system, characterized in that the path is set so that the internal switching cell is output to the output port is set to 1 bit corresponding to each output port of the switch output port number How to use VPI and VCI in switching cells.
    [4" claim-type="Currently amended] The method of claim 1,
    In the step (d), the output cell processing apparatus includes a virtual path conversion table storing the number of cell copies corresponding to the virtual path conversion table address and the number of VPIs and VCIs in the ATM switching system. How to use VPI, VCI of internal switching cell.
    [5" claim-type="Currently amended] The method of claim 4, wherein
    The output cell processor reads the VPI and VCI corresponding to the virtual path translation table address from the virtual path translation table and converts the internal switching cell into a transmission ATM cell. The VPI and VCI of the internal switching cell in the ATM switching system. How to use.
    [6" claim-type="Currently amended] The method of claim 4, wherein
    The output cell processing apparatus reads the cell copy number value corresponding to the virtual path translation table address of the internal switching cell from the virtual path translation table, and reads the VPI and VCI from the virtual path translation table by the number of times to read the ATM cell for transmission. Method of utilizing VPI, VCI of internal switching cell in ATM switching system characterized by copying.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2000-09-29|Application filed by 구자홍, 엘지전자주식회사
    2000-09-29|Priority to KR1020000057418A
    2000-09-29|Priority claimed from KR1020000057418A
    2002-04-04|Publication of KR20020025525A
    2002-08-24|Application granted
    2002-08-24|Publication of KR100349805B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1020000057418A|KR100349805B1|2000-09-29|Method for Broadcasting and Multicasting using the VPI and VCI of switching cell in ATM Switching System|
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