KR100369369B1 - A Virtual Channel Merge Apparatus MutiProtocol Label Switch System - Google Patents

Abstract

The present invention relates to a virtual channel merge device of a multi-channel label switch system, which can handle up to 622 Mbps traffic required in a multi-channel label switch (MPLS) system to provide IP services in an ATM network. It provides the virtual channel merge device of the system, and provides the virtual channel merge function at the maximum speed of 622Mbps by using the assembly and partitioning method of AAL5 frame.

Description

A virtual channel merge device of a multichannel label switch system {A Virtual Channel Merge Apparatus MutiProtocol Label Switch System}

The present invention relates to a virtual channel merge device of a multi-channel label switch system, and more particularly, to a virtual channel merge of a multi-channel label switch system (MPLS) system for providing IP service using an ATM network. Relates to a device.

As a system designed to support IP services in an existing ATM switch, there is a multi-channel label switch (MPLS) system, and the multi-channel label switch (MPLS) system requires a virtual channel merge device.

In the virtual channel merge device of the multi-channel label switch (MPLS) system, when ATM cells received from multiple subscribers are delivered to the same destination, they are assembled into AAL5 frames for each virtual channel connection (VCC) and then multiplexed in units of frames. In addition, the number of virtual channel connections (VCCs) available in a multi-channel label switch (MPLS) network may be increased by dividing the data into ATM cells having the same virtual path identification number (VPI) / virtual channel identification number (VCI). Can be.

However, the existing ATM switch does not provide a virtual channel merge device that is required to provide an IP (Internet Protocol) service, thereby providing an IP service.

An object of the present invention is proposed to solve such a conventional problem, a multi-channel label capable of handling up to 622 Mbps traffic required in a multi-channel label switch (MPLS) system to provide IP services in ATM networks The present invention provides a virtual channel merge device of a switch system.

1 is a block diagram of a virtual channel merge device of a multi-channel label switch system according to an embodiment of the present invention.

2 is a structural diagram of a data frame of a virtual channel merge device of a multi-channel label switch system according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

101: CPU 102: receiving cell storage unit

103: UTOPIA matching unit 104: packet receiving unit

105: transmission buffer control unit 106: packet storage unit

107: scheduling 108: transmitting cell processing unit

109: reception control memory 110: reception packet memory

111: transmission control memory 112: transmission packet memory

The apparatus of the present invention for achieving the above object is, in a virtual channel merge device of a multi-channel label switch system, receiving an ATM (Asynchronous Transfer Mode) cell and a physical link port number from a UTOPIA interface from a reception control memory. A receiving cell processing unit for reading a transmission / reception channel identification value and transferring the received channel identification value to the receiving cell storage unit together with the cell; A reception control memory for receiving the transmission / reception channel identification value, storing the result in a memory, deleting the call release, and reading the transmission / reception channel identification value from the memory and transferring the received channel identification value to the reception cell processor; Receives a cell from the receiving cell processing unit and stores cells belonging to the same frame in the receiving packet memory using each receiving channel identification value, and receives at least one complete frame from the packet memory upon receiving a frame transmission notification from the packet transmitting unit. Receiving cell storage unit for outputting after checking whether included; A utopia matching unit for transferring the data transmitted from the receiving cell storage unit to the packet receiving unit; A reception packet memory for storing or reading data in a memory at the request of the reception cell storage unit and transferring the data to the reception cell storage unit; The transmission channel identification value is read using the transmission channel identification value of the data received from the utopia matching unit, the IP packet received at the utopia matching unit is divided into ATM cell payloads, and the transmission channel identification value received from the transmission control memory. A packet receiver for attaching the packet to a transmission buffer controller; A transmission control memory section for receiving transmission channel expression values for each VCC (Virtual Channel Connection) from a central processing unit (CCC) at call setup and storing them in a memory, and deleting these values upon call release; A transmission buffer control unit for managing a state of a transmission packet memory unit for storing packets for each channel; Create ATM cell and store it in transmission packet memory, manage by linking memory location where cell is stored for each transmission channel identification value, and store packet to read and transmit ATM cell transmission request in specific channel if requested part; A scheduling unit for receiving the cell stored information provided from the packet storage unit and determining the next cell to be delivered based on the priority information and the traffic shaping information and delivering the cell to the packet storage unit; A transmission packet memory for storing or reading a packet in a memory at the request of the packet storage unit and delivering the packet to the packet storage unit; And a transmitting cell processor for receiving the cell from the scheduling unit and delivering the cell to the outside.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a virtual channel merge device of a multi-channel label switch system according to an embodiment of the present invention. As shown in FIG. 1, the virtual channel of a multi-channel label switch system according to an embodiment of the present invention is shown. The channel merge device is configured to receive an ATM cell and a physical link port number from a UTOPIA interface, and to read and receive channel identification values 203 and 209 from the reception control memory 109 using the VPI / VCI value and the physical link port number. Receiving cell processing unit 100 to transmit to the receiving cell storage unit 102, and when receiving a call from the CPU 101 receives the transmission and reception channel identification value allocated for each physical link number and VPI / VCI stored in the memory and released the call Deletes it, and the receiving cell processor 100 receives the physical link port number and the VPI / VCI value of the receiving cell and reads the transmission / reception channel identification value from the memory using this as an address of the memory. The reception control memory 109 and the reception cell processing unit 100 transmits the cell from the reception cell processing unit 100, and successively connects cells belonging to the same frame by using the reception channel identification values. A packet consisting of a value 203 and an AAL5 frame (204, 205, 206) is stored in the receiving packet memory 110 and one complete frame (203, 204, 205, 206) is received from the packet memory when the packet transmitter is informed that the frame can be transmitted through the UTOPIA interface. Reads and checks whether an error is included in the AAL5 frame (204, 205, 206). If there is an error, discards the corresponding packet. If there is no error, UTOPIA matches the data consisting of the transmission channel identification value (207) and the IP packet (208). Receiving cell storage unit 102 for transmitting to the unit 103, theUTOPIA matching unit 103 for transferring the transmitted data to the packet receiving unit 104, and the receiving cell storage unit Data including the reception packet memory 110 for storing or reading data in the memory or transmitting the data to the reception cell storage unit 106 by the blue, and the transmission channel identification value 203 and the IP packet 208 from the UTOPIA matching unit. Reads the transmission channel expression value from the transmission control memory 211 using the transmission channel identification value, divides the IP packet 208 received at the UTOPIA matching unit into the ATM cell payload in units of 48 bytes, and transmits the transmission control memory. The packet receiving unit 104 attaches the transmission channel identification value 207 received from the transmission unit to the transmission buffer control unit 105, and receives the transmission channel expression value for each VCC from the CPU 101 at the time of call setup and stores it in the memory. And manages the state of the transmission control memory 111 for deleting these values upon call release and the transmission packet memory 112 for storing packets for each channel, if there is no space for storing the received packets. ATM Cells Otherwise, if not, the transmission buffer control section 105 for transmitting the ATM cell to the packet storage section 106, and the IP packet divided into a transmission channel identification value, transmission channel expression value, and 48 bytes from the transmission buffer control section 105. Receives 208, generates an AAL5 frame, generates an ATM cell using the transmission channel expression value, stores the ATM cell in the transmission packet memory 112, and stores the cell for each transmission channel identification value. The memory location is managed by cell storage information, and the cell management information is transmitted to the cell scheduling function for each transmission channel identification value, and when the ATM cell transmission request of a specific channel is requested from the scheduling, the ATM cell is read from the transmission packet memory for scheduling. Priority information and traffic shaping determined at the time of call establishment by receiving the forwarding packet storage unit 106 and the linked list provided from the packet storage unit 107 Scheduling 107 which determines cells to be delivered next by the information and forwards them to the packet storage unit, and transmit packet memory which stores or reads the packets in the memory and transmits them to the packet storage unit 106 at the request of the packet storage unit. 112) and a transmitting cell processor 108 which receives the cell in the scheduling and delivers the cell to the outside through the UTOPIA level 2 interface.

With the above configuration, the operation of the virtual channel merge device of the multi-channel label switch system according to the embodiment of the present invention is as follows.

A virtual channel merging device is required to reduce the number of virtual channel connections (VCCs) when IP packets are delivered using AAL5 frames delivered from a multichannel label switch network (or ATM network). The virtual channel merge device of a multi-channel label switch (MPLS) system provides a multi-channel label switch (MPLS) network by giving the same VCI and VPI values of ATM cells delivered to the same destination among ATM cells received from multiple subscribers. Increase the number of virtual channel connections (VCC) available in.

A brief description of the procedure of the virtual channel merge function is as follows. A number of subscribers send ATM 200, 201, 202 cells having an AAL5 frame composed of frame header 204, frame data 205, and frame trailer 206 to an ATM switch.

At the ATM exchange, cells received for each subscriber are assembled to recover AAL5 (204, 205, 206) frames and multiplex in AAL5 frame units. Then, the frame is divided into output ATM cells so as to have the same VPI / VCI value for the frame having the same destination, and delivered to the destination subscriber.

The destination subscriber recovers an AAL5 frame consisting of the AAL5 frame header 204, data 205, and trailer 206 from the ATM cell, and extracts the IP packet 208 contained in the frame. Then, the transmission subscriber is identified by the transmission address of the extracted IP packet 208.

If the ATM switch is multiplexed by ATM cell instead of AAL5 frame unit for the cell delivered to the same destination, the cells delivered from different subscribers are mixed and the destination subscriber cannot extract the AAL5 frame. Since this is impossible, AAL5 frame recovery is required.

As shown in FIG. 1, a detailed configuration of the virtual channel merging device for the virtual channel merging function includes a receiving cell processing unit 100, a receiving cell storage unit 102, a UTOPIA matching unit 103, and the like. The packet receiving unit 104, the transmission buffer control unit 105, the packet storage unit 106, the scheduling 107, the transmission cell processing unit 108, the reception control memory 109, the reception packet memory ( 110, a transmission control memory 111, and a transmission packet memory 112. As shown in FIG.

The receiving cell processing unit 100 receives the ATM cell 200, 201, 202 and the physical link port number from the UTOPIA interface, and includes a virtual path identification number (VPI) / virtual channel identification number (VCI) value and a physical link port included in the header part. Using the number as an address, the reception channel identification value 209 and the transmission channel identification value 203 are read from the control memory and transferred to the reception cell storage unit 101 together with the cell. The reception channel identification value is a unique channel identification value that can be used instead of the virtual path identification number (VPI) / virtual channel identification number (VCI) value of the received ATM cell.

The reception control memory 109 receives the transmission / reception channel identification values allocated to the virtual path identification number (VPI) / virtual channel identification number (VCI) from the CPU 101 at the time of call setup, stores them in the memory, and deletes them when the call is released. . Then, the physical cell port number and the virtual path identification number (VPI) / virtual channel identification number (VCI) values are received from the reception cell processing unit 100, and the transmission and reception channel identification value is transmitted to the reception cell processing unit 100.

The receiving cell storage unit 102 receives the ATM cell and the transmission / reception channel identification value from the reception cell processing unit 100 and stores the transmission channel identification value and the payload portion of the cell in a buffer allocated to each reception channel. That is, by connecting cells belonging to the same frame for each reception channel continuously, the packet including the transmission channel identification value 203 and the AAL5 frames 204, 205, and 206 is stored in the reception packet memory 110. In addition, when the receiving cell storage unit 102 receives a notification from the packet receiving unit 104 that the frame transmission is possible through the UTOPIA interface, the receiving cell storage unit 102 reads one complete frame 203, 204, 205, or 206 from the packet memory and includes an error in the AAL5 frame (204, 205, 206). Investigate whether or not. If there is an error, the corresponding packet is discarded. If there is no error, the data consisting of the transmission channel identification value 207 and the IP packet 208 is transmitted to the UTOPIA matching unit 103.

The UTOPIA matching unit 103 transfers the data transmitted from the receiving cell storage unit 102 to the packet receiving unit 104. If the amount of data transferred from the receiving cell storage unit 102 is greater than the data capacity that can be processed by the packet receiving unit 104, congestion occurs in the internal buffer. In this case, a control signal for temporarily stopping traffic flowing from the receiving cell storage unit 102 is transmitted to the receiving cell storage unit 102.

The reception packet memory 110 stores or reads data in the memory at the request of the reception cell storage 102 and transfers the data to the reception cell storage 106.

The packet receiving unit 104 receives data including the transmission channel identification value 203 and the IP packet 208 from the UTOPIA matching unit 103 and expresses the transmission channel from the transmission control memory 211 using the transmission channel identification value. Read the value. The transmit channel expression includes ATM cell header information, service class, and traffic shaping information. In addition, the packet receiver 104 divides the IP packet 208 received by the UTOPIA matching unit into ATM cell payloads in units of 48 bytes, and attaches a packet over header 207 received from the transmission control memory 211. The transmission is transmitted to the transmission buffer control unit 105.

The transmission control memory 111 receives transmission channel expression values for each transmission channel from the CPU at the time of call setup and stores them in the memory, and deletes these values when the call is released.

The transmission buffer controller 105 manages the state of the transmission packet memory for storing the packet in consideration of the service level for each transmission channel. If there is no space for storing the received packet, the received ATM cell is discarded. Otherwise, the transmitted ATM identification value, the transmit channel expression value, and the payload portion of the ATM cell are transmitted to the packet storage unit 106. do.

The packet storing unit 106 receives the transmission channel expression value, the transmission channel identification value 207, and the IP packet 208 divided into 48 bytes from the transmission buffer control unit 105, thereby receiving the frame header 204 and the frame data. 205 generates an AAL5 frame consisting of a trailer 206. The generated AAL5 frame is divided into ATM cells using the cell header information included in the transmission channel expression value, and stores the memory location for each transmission channel in the transmission packet memory as the cell stored information (linked list). The cell management information for each transmission channel is transmitted to a cell scheduling function, and when there is a request for transmission of an ATM cell of a specific channel from the scheduling, the cell management information is read from the transmission packet memory and transferred to the scheduling 107.

The scheduling 107 receives the cell stored information (linked list) provided from the packet storage 106 and determines the cells to be delivered next, and transmits the cells to the packet storage 106. Upon completion of one cell transmission in the scheduling 107, the cell is deleted from the linked list of the corresponding transmission channel and automatically waits for the next cell to be delivered. In addition, when there are cells to be transmitted simultaneously in multiple virtual channel connections (VCC), the transmission order is determined by the service class and traffic shaping information determined at the time of call setup for each virtual channel connection (VCC) to the packet storage unit 106. To pass. In addition, the service class is classified into four classes. If transmission of cells is simultaneously required in multiple channels, cells included in a channel having high priority are transmitted first. Traffic shaping information indicates traffic characteristics such as a peak cell rate (PCR) and a sustainable cell rate (SCR) for each virtual channel connection (VCC). The transmission packet memory 112 stores or reads the packet in the memory at the request of the packet storage unit 106 and transfers the packet to the packet storage unit 106. The transmitting cell processor 108 transmits the cell to be transmitted to the outside through the UTOPIA level 2 interface.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

As described above, the virtual channel merging device of the multi-channel label switch system of the present invention provides a virtual channel merging function capable of processing high speed (eg, 622 Mbps) traffic, thereby ensuring a high speed IP service in an ATM network. Has an effect.

Claims (10)

In the virtual channel merge device of a multi-channel label switch system, A receiving cell processor for receiving an Asynchronous Transfer Mode (ATM) cell and a physical link port number from a UTOPIA interface, reading a transmit / receive channel identification value from a receiving control memory, and transferring the received channel identification value to the receiving cell storage unit together with the cell; A reception control memory for receiving the transmission / reception channel identification value, storing the result in a memory, deleting the call release, and reading the transmission / reception channel identification value from the memory and transferring the received channel identification value to the reception cell processor; Receives a cell from the receiving cell processing unit and stores cells belonging to the same frame in the receiving packet memory using each receiving channel identification value, and receives at least one complete frame from the packet memory upon receiving a frame transmission notification from the packet transmitting unit. Receiving cell storage unit for outputting after checking whether included; A utopia matching unit for transferring the data transmitted from the receiving cell storage unit to the packet receiving unit; A reception packet memory for storing or reading data in a memory at the request of the reception cell storage unit and transferring the data to the reception cell storage unit; The transmission channel identification value is read using the transmission channel identification value of the data received from the utopia matching unit, the IP packet received at the utopia matching unit is divided into ATM cell payloads, and the transmission channel identification value received from the transmission control memory. A packet receiver for attaching the packet to a transmission buffer controller; A transmission control memory section for receiving transmission channel expression values for each VCC (Virtual Channel Connection) from a central processing unit (CCC) at call setup and storing them in a memory, and deleting these values upon call release; A transmission buffer control unit for managing a state of a transmission packet memory unit for storing packets for each channel; Create ATM cell and store it in transmission packet memory, manage by linking memory location where cell is stored for each transmission channel identification value, and store packet to read and transmit ATM cell transmission request in specific channel if requested part; A scheduling unit for receiving the cell stored information provided from the packet storage unit and determining the next cell to be delivered based on the priority information and the traffic shaping information and delivering the cell to the packet storage unit; A transmission packet memory for storing or reading a packet in a memory at the request of the packet storage unit and delivering the packet to the packet storage unit; And Transmission cell processing unit for receiving the cell from the scheduling unit for delivery to the outside Virtual channel merge device of a multi-channel label switch system comprising a. The method of claim 1, The receiving cell processing unit, And a virtual channel identification value (VPI) / virtual channel identification number (VCI) value and a physical link port number are used to read the transmission and reception channel identification value from the reception control memory. The method of claim 1, The transmission and reception channel identification value, Virtual channel merging device of a multi-channel label switch system, characterized in that the physical link number and the virtual path identification number (VPI) / virtual channel identification number (VCI) is assigned from the central processing unit (CPU). The method of claim 1, The reception control memory, The receiving cell processor receives the physical link port number and the virtual path identification number (VPI) / virtual channel identification number (VCI) of the receiving cell and uses the address of the memory to read the transmission and reception channel identification value from the memory. Virtual channel merge device of a multichannel label switch system. The method of claim 1, The receiving cell storage unit, Upon receiving a notification that a frame can be transmitted from the packet transmission unit, at least one complete frame is read to check whether an error is included in the AAL5 frame, and if there is an error, the corresponding packet is discarded. Virtual channel merge device of a multi-channel label switch system, characterized in that for outputting the data consisting of the IP packet to the UTOPIA matching unit. The method of claim 1, The packet receiver, Receives data including a transmission channel identification value and an IP packet from the UTOPIA matching unit, divides the IP packet received at the UTOPIA matching unit into ATM cell payloads in units of 48 bytes, and transmits and controls memory. Virtual channel merging device of a multi-channel label switch system, characterized in that the transmission channel identification value received from the attached to the transmission buffer control unit. The method of claim 1, The transmission buffer control unit, Manages the state of the transmission packet memory unit for storing packets for each channel. If there is no space for storing the received packet, discards the received ATM cell and receives the ATM if there is space for storing the received packet. Virtual channel merge device of a multi-channel label switch system, characterized in that for delivering the cell to the packet storage. The method of claim 1, The packet storage unit, Receiving the transmission channel identification value, the transmission channel expression value, and the IP packet divided into 48 bytes from the transmission buffer controller to generate an AAL5 frame, and generating the ATM cell using the transmission channel expression value. Virtual channel merge device of a multichannel label switch system. The method of claim 1, The packet storage unit, Link and manage memory locations in which cells are stored for each transmission channel identification value, and transmit cell management information for each transmission channel identification value to a cell scheduling function, and if there is an ATM cell transmission request of a specific channel from the scheduling unit. Virtual channel merge device of a multi-channel label switch system, characterized in that for reading from the transmission packet memory. The method according to claim 1, wherein The transmission cell processing unit, Virtual channel merging device of the multi-channel label switch system, characterized in that for transmitting the cell developed by the scheduling unit to the outside through a utopia (UTOPIA) level 2 interface.