WO2005015837A1 - Procede et systeme de mise en oeuvre d'emission de paquets de donnees - Google Patents

Procede et systeme de mise en oeuvre d'emission de paquets de donnees Download PDF

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Publication number
WO2005015837A1
WO2005015837A1 PCT/CN2004/000911 CN2004000911W WO2005015837A1 WO 2005015837 A1 WO2005015837 A1 WO 2005015837A1 CN 2004000911 W CN2004000911 W CN 2004000911W WO 2005015837 A1 WO2005015837 A1 WO 2005015837A1
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WO
WIPO (PCT)
Prior art keywords
cell
multicast
network
user
transmission bus
Prior art date
Application number
PCT/CN2004/000911
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English (en)
Chinese (zh)
Inventor
Qiang Xie
Yufa Han
Yupeng Xiong
Yong Luo
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CNB031439934A external-priority patent/CN100546263C/zh
Priority claimed from CNB031541461A external-priority patent/CN100358319C/zh
Priority claimed from CNB031542948A external-priority patent/CN1327664C/zh
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2005015837A1 publication Critical patent/WO2005015837A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/168—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP] specially adapted for link layer protocols, e.g. asynchronous transfer mode [ATM], synchronous optical network [SONET] or point-to-point protocol [PPP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5665—Interaction of ATM with other protocols
    • H04L2012/5667—IP over ATM

Definitions

  • the present invention relates to the field of network communication technology, and more particularly, to a method for implementing data transmission and a system based on which data transmission is implemented. Background of the invention
  • data message transmission methods include: unicast and multicast.
  • multicast includes multicast and broadcast.
  • Unicast is a point-to-point transmission method; multicast is a transmission method based on one-point transmission and specific multi-point reception; and broadcast is a transmission method based on one-point transmission and unspecified multi-point reception.
  • multimedia services such as streaming media, video conferencing, and video-on-demand on the Internet become an important part of information transmission in network communication systems, more and more multicast data packets are transmitted on the network. It becomes more and more important in network communication.
  • this transmission method requires the server to copy a corresponding message for each user requesting to send a message, and The message is sent to the user. Therefore, if the transmission of multicast data messages is implemented in unicast mode, when multiple users request the same message to be sent, the server will copy a copy of the same content for each user's request. The message is sent to each user who requests the message through the network node. Obviously, a large amount of system resources will be occupied on the network due to repeated transmission of packets with the same content. In addition, this processing method requires the server in the system to repeatedly copy and send packets with the same content, which will cause a bottleneck in data transmission and waste service. Server resources and cause server processing power to decrease.
  • this transmission method requires that when a user of one node in the network sends a message, all other user nodes must Receive, so if the multicast data transmission is implemented in a broadcast mode, as long as one user requests a data message, the server in the system will send the data message to all users, and all users in the network To receive the data message. In fact, not all users need these data packets, so this processing method will cause unnecessary packets to be transmitted on the network, which will cause a bottleneck in data transmission and waste network resources.
  • the current broadcast mode is implemented by copying data packets. Therefore, the system may need to copy many data packets. Obviously, this will waste network resources.
  • the information transmission method adopted by multicast is single-point transmission and specific multi-point reception.
  • This transmission method requires the server to send data packets to specific multiple receivers in the network. Therefore, when one or more users under the same network node request the same data message, the multicast server should theoretically only need to copy one message and send it to the network node. Users receive messages according to their needs.
  • the existing method for solving the transmission of multicast data messages can be implemented based on an Ethernet switching module, which is the above-mentioned network node, and the network connected to the Ethernet switching module can be an IP network.
  • the module The specific internal connection relationship is shown in Figure 1. In FIG.
  • users 1 to 4 are connected to the switching module through a user interface in the switching module, and a multicast server is connected to the switching module through a network interface in the switching module.
  • the multicast server sends a corresponding multicast data packet to the switching module according to the user's application, and there is only one packet; the switching module receives the multicast sent by the multicast server through the network interface. Data packets and store them in their own shared buffers; assuming that user 1 and user 4 need the multicast data messages stored in the shared buffer, the switching module copies the corresponding multicast data messages to User interface 1 and user interface 4; user 1 receives a multicast data message from user interface 1, and user 4 receives a multicast data message from user interface 4.
  • the transmission of the multicast data message is completed.
  • the switching module 1 to the switching module 5 constitute a multicast device, and the multicast server is connected to the multicast device through a network interface in the multicast device; the switching module 2 to the switching module 5 are respectively connected to the switching module 1 and exchanged Module 1 uses its cascaded switching modules 2 to 5 as its own users.
  • Users 1, 2 are connected to switch module 2
  • user 3 is connected to switch module 3
  • user 4 is connected to switch module 4
  • users 5, 6 are connected to switch module 5.
  • the multicast server sends corresponding multicast data packets to the multicast device according to the application data of the multicast messages of users 1 to 6, and the multicast device receives the multicast server through the network interface.
  • Send a multicast data message and store the data message in a shared buffer of the switching module 1.
  • switch module 1 copies and sends the data message stored in its shared buffer to the switch module.
  • Block 2 and switching module 4; switching module 2 and switching module 4 receive the multicast data message sent by switching module 1, and store the data message in its own shared buffer; after that, switching module 2 stores itself This data message stored in the shared buffer is sent to user 1, and the switching module 4 sends this data message stored in its own shared buffer to user 4.
  • the switching module needs to copy the multicast data message stored in its own shared buffer to the corresponding cascade switching module or user, which requires higher processing performance of the switching module;
  • the switching device may be an asynchronous transmission mode digital subscriber line access multiplexer (ATM DSLAM), which is within the ATM DSLAM.
  • ATM DSLAM asynchronous transmission mode digital subscriber line access multiplexer
  • the department implements multicast replication through point-to-multipoint connections.
  • each network server that is, multicast source 1
  • VC virtual connection
  • the transmission of multicast data will cause the cells to be out of order due to the interleaving of multicast cells and Internet cells. Therefore, in addition to establishing a VC for Internet access on each user's remote terminal device (RTU), And also establish a dedicated multicast VC ".
  • the ATM DSLAM also needs to be configured with a multicast forwarding table, which specifies the correspondence between the user multicast VC "and the multicast source VC. After receiving the multicast data from the multicast source VC, the ATM DSLAM uses the multicast forwarding table. Copy the multicast data to the specified user multicast VC ".
  • each multicast source must be an ATM node, so it cannot implement a VC connection bearer.
  • Multiple multicast groups On the one hand, this causes waste of connection resources and equipment, and P reduces the flexibility and simplicity of networking.
  • new multicast sources are to be added, data configuration must be increased, so the scalability of the network is poor. .
  • Multicast streams and unicast service streams on the network side need to pass through different VCs to the ATM DSLAM. This is because unicast streams and multicast streams are processed differently on DSLAM. Unicast streams are only cross-connected on DSLAM. Multicast streams are based on virtual path identifiers and virtual channel identifiers. The (VPI / VCI) identifier is used for multicast forwarding. Therefore, the unicast stream and the multicast stream cannot use the same VC for downlink.
  • the RTU configuration requirements should be as simple and fixed as possible.
  • the DSLAM is downlinked to the RTU, it needs to be carried on two VCs.
  • Unicast data and multicast data bring some complexity to the configuration of RTU.
  • ATM DSLAM internally implements multicast replication through point-to-multipoint connections, which is not efficient, and multicast data is replicated within DSLAM, adding DSLAM equipment With the load of T2004 / 000911, too much multicast data can easily become a performance bottleneck.
  • ATM DSLAM is fixedly forwarded according to the multicast forwarding table, which prevents users from dynamically joining or leaving a multicast group. If a user needs to receive data of a certain multicast group, he must apply to the operator for service provisioning. After the operator opens this application for the user, even if the user closes the multicast terminal software on the terminal device, that is, when the user no longer needs to receive the multicast data, the ATM DSLAM will still send the multicast data to the user RTU.
  • the multicast forwarding table is managed and configured by the network administrator, which results in inflexible service development, increases the workload of maintenance, and consumes the user's bandwidth when the user does not need it.
  • the main purpose of the present invention is to provide a method for implementing data message transmission, so as to realize the transmission of data messages including unicast, multicast, and broadcast, and not to transmit multicast datagrams. Text and waste network resources.
  • Another object of the present invention is to provide a system for implementing data message transmission.
  • a method for implementing data packet transmission according to the present invention includes the following steps: a.
  • the transmitting end converts a data packet to be sent into a cell and sends it;
  • the receiving end receives the cell, and transmits the data message corresponding to the cell according to the information carried by the cell.
  • a transmission bus connecting the transmitting end and the receiving end may be set, the cell is a cell set to be transmitted on the transmission bus, and the cell has a corresponding VPI / VCI, and the cell may be an ATM cell ;
  • step a the transmitting end transmits the converted cell to the transmission bus: in step b, the receiving end receives the cell from the transmission bus.
  • the data message includes: a unicast data message, a multicast data message, and a broadcast data message.
  • a system for implementing data message transmission according to the present invention includes:
  • Network-side interface device converts a data message sent from the network into a cell, and sends the cell and the cell identifier to the transmission bus together;
  • User-side interface device Receives a cell sent by a network-side interface device to a transmission bus, and then sends the cell to a corresponding user terminal according to a cell identifier of the cell.
  • the user-side interface device in the system can further convert the data message sent by the user terminal into a cell, and send it to the transmission bus together with the unicast cell identifier;
  • the network-side interface device may further receive a cell sent by the user-side interface device to the transmission bus, and send a data packet corresponding to the cell to the network.
  • the user terminal sends the request data message of the user terminal to the network side through the transmission bus, and records related information of the request data message; the network side sends the unicast data message and multicast data message to be sent in the network After the text is converted into a cell, it is transmitted to the transmission bus; each user side connected to the transmission bus receives the cell on the transmission bus, and sends the cell to the corresponding user terminal according to the cell identifier and the requirements of the user terminal, so that
  • the cell when multiple users need the same cell, the cell does not need to be copied multiple times to transmit the cell to the corresponding user, so that the system does not transmit when a multicast data message is transmitted.
  • the bottleneck and the package efficiently implement the transmission of multicast data messages, save network resources, and improve the transmission performance of network communication equipment, thereby reducing the cost of communication equipment when the communication equipment supports the same number of users. Alas.
  • the solution of the present invention also provides a processing procedure for data packet transmission of the ATM network. Since multicast packet transmission does not need to be transmitted through a multicast forwarding table, multiple multicast group data on the network side can be placed on one VC. As a result, multiple multicast streams can be provided by one multicast server, which effectively saves uplink connection resources and equipment investment, and also facilitates simplified networking. Network-side multicast data streams and unicast data streams can also be placed on a VC This saves uplink connection resources and reduces the maintenance workload of operator maintenance personnel.
  • the user-side multicast data stream and unicast data stream can be carried on a VC, which can avoid the need to reconfigure a large number of user terminals when adding multicast services, which greatly reduces the workload of maintenance personnel.
  • the ATM DSLAM internally implements multicasting via the ATM transmission bus, which saves system resources and improves efficiency.
  • each user port receives multicast data on the bus according to its own multicast group. It does not require the CPU to perform cell replication and saves Bandwidth resources inside the device.
  • the solution of the present invention also enables users to dynamically join or leave multicast groups as needed, and the system can control users to join multicast groups according to pre-set permissions. After users leave, the system no longer sends multicasts to them Data, reducing the bandwidth occupation of user ports and improving forwarding efficiency.
  • FIG. 1 is a schematic diagram of implementing a multicast data message transmission using a switching module in the prior art
  • FIG. 2 is a schematic diagram of implementing a multicast data message transmission using a cascade of switching modules in the prior art
  • FIG. 3 is a schematic diagram of multiple multicast, wide area network, bandwidth access, and user RTU systems based on ATM DSLAM equipment in the prior art;
  • 5 is a second system for implementing data message transmission according to an embodiment of the present invention.
  • FIG. 6 is a third system for implementing data packet transmission according to an embodiment of the present invention.
  • FIG. 7 is a system for implementing data packet transmission based on IP DSLAM in an embodiment of the present invention
  • FIG. 8 is a schematic diagram of protocol processing in the system shown in FIG. 7;
  • FIG. 9 is a diagram illustrating a system for transmitting data packets based on an ATM DSLAM in an embodiment of the present invention.
  • 10 is a flowchart of processing a downlink transmission data message in the system shown in FIG. 9;
  • FIG. 11 is a flowchart of processing a transmission data message upstream in the system shown in FIG. 9;
  • FIG. 12 is an ATM DSLAM in the system shown in FIG. Structure diagram of the equipment after adding relevant modules;
  • FIG. 13 is a processing flowchart of a user joining a multicast group in the system shown in FIG. 9. Mode of Carrying Out the Invention
  • the core idea of the present invention is: setting a transmission bus between a transmitting end and a receiving end, and setting a cell for transmission on the transmission bus, and the transmitting end converts a data message to be transmitted in the network into the cell, And sending the cell to the transmission bus; the receiving end receives the cell from the transmission bus, and restores the cell to a data message according to the information carried by the cell.
  • information transmission between a network server connected to the network side and a user terminal connected to the user side in the network can be realized.
  • the transmission bus used in the present invention may specifically adopt a bus based on the ATM transmission bus standard.
  • a bus based on the ATM transmission bus standard can support a maximum of 32 transmission bus interface units at the same time, that is, the sum of the user side and the network side to which the transmission bus is connected is 32.
  • buses based on the ATM transmission bus standard can provide shared switching capacity above IGbps.
  • the characteristic of the transmission bus is to use one bus to complete the exchange of ATM cells between the transmission bus interface units of different boards, and there can be multiple user sides connected to the transmission bus, and each user connected to the transmission bus
  • the transmission bus interface unit on the side and the network side provides a richer cell scheduling mechanism such as three-level routing lookup. Therefore, ATM cells on the transmission bus can be implemented in each user-side and network-side transmission bus interface unit. Exchange.
  • the invention can realize the transmission of data messages on the transmission bus through ATM cells.
  • ATM is a high-speed, low-latency multiplexing switching technology.
  • ATM uses cells and provides limited error detection operations to make the network fast enough to support multi-megabit transmission rates. Therefore, the present invention utilizes the transmission characteristics of ATM cells, and converts unicast data packets and multicast data packets into ATM cells, and receives and sends them through a transmission bus.
  • the user side and the network side connected to the transmission bus The ATM cell is then restored into a data message, and the data message is transmitted according to the destination address carried by the data message, thereby completing the transmission of the data message between the network side and the user side.
  • data packets can be transmitted between the network side and the user side without requiring multiple replications, thereby achieving the datagram simply and efficiently. Text transmission.
  • the network side When the network is an IP network, when the network side sends data packets to the user terminal, the network side first converts unicast data packets and multicast data packets transmitted by the network server into cells, and passes them through The transmission bus is sent to the user side; the user side receives the cell from the transmission bus, and converts the cell into a corresponding data message according to the information carried by the cell, and then transmits the data to the corresponding data message.
  • User terminal The request data message sent from the user terminal to the network side is first converted by the user side into the corresponding cell and sent to the network side through the transmission bus; the network side receives the cell from the transmission bus, It converts it into a request data message according to the information carried by the cell, and then transmits it to the corresponding network server.
  • MAC media access control
  • the upstream direction refers to the direction from the user side to the network.
  • Side the downward direction refers to the network side to the user side.
  • the user side When the user side receives the request data message transmitted from the user terminal, the user side converts the message into a cell according to the source MAC address in the request data message. This is because different types of data packets have different MAC addresses, so cell conversion can be performed based on the MAC address. Different types of cells have different VPI VCL after conversion
  • the types of data messages that the user terminal requests the IP network to send to it include unicast data messages, multicast data messages, and broadcast data messages. If the user terminal needs the IP network to send a multicast data message to itself, it needs to record the relevant information of the request data message.
  • the relevant information includes the address information of the user terminal and the multicast group number of the multicast data message requested to be sent. .
  • the related information may be specifically recorded on the user side or on the network side, so that the user side can forward multicast data packets according to the information. Of course, if recorded on the network side, the network side needs to send the information To the user side.
  • the user side adds a unicast cell identifier and the characteristic information of the destination to the cell according to the VPI / VCI of the converted cell, and passes the cell, the unicast cell identifier, and the characteristic information of the destination to the unicast message together.
  • the VC corresponding to the meta ID is sent to the transmission bus.
  • the characteristic information of the destination includes a port number and a slot number, and the characteristic information of the destination may also be set in a unicast cell identifier. Because the request data message sent by the user terminal can only be unicast data, the cell identifier added to the cell by the user side is the unicast cell identifier.
  • All ports connected to the transmission bus receive cells on the transmission bus, and determine whether to receive the cell based on the cell identifier and the characteristic information of the destination.
  • the network side restores the received cell into a request data packet, and according to The destination MAC address of the request data message is sent to the IP network. Because the feature information of each user side and the feature information of the destination end of the cell are different, Therefore, each user side discards the received cells.
  • the network side converts the data packet into a cell according to the source MAC address of the data packet to be sent from the IP network.
  • the network side adds the corresponding cell identifier and the characteristic information of the destination according to the VPI / VCI of the cell, and sends the cell, the cell identifier, and the characteristic information of the destination to the transmission bus together.
  • the data messages to be sent may be unicast data messages, multicast data messages, and broadcast data messages.
  • the network side When sending a cell and related information to a transmission bus, if the data packet is a unicast data packet, the network side adds a cell identifier for the cell according to the source MAC address of the unicast data packet as unicast. Cell ID. In addition, the characteristic information of the destination end corresponding to the destination MAC address of the unicast data message is also added to the cell. Then, the converted cells, the characteristic information of the destination end, and the unicast cell identifier are sent to the transmission bus through the VC corresponding to the unicast cell identifier. Similarly, the feature information of the destination can be set in the unicast cell identifier.
  • the network side adds a multicast cell identifier to the cell according to the source MAC address of the multicast data message, and increases the multicast group number of the multicast data message. Then, the cell, the multicast cell identifier, and the multicast group number are sent to the transmission bus through the VC corresponding to the multicast cell identifier.
  • the multicast group number may be set in the multicast cell identifier.
  • the network side may add a broadcast cell identifier to the cell according to the source MAC address of the broadcast message, and correspond the cell and the broadcast cell identifier together through the broadcast cell identifier.
  • VC is sent to the transmission bus.
  • the network side may determine to allow the currently sent cells according to a predetermined algorithm and a predetermined priority to avoid transmission of the cells. Data congestion occurred during the process.
  • multicast cells can be set Has the highest priority, and the unicast cell has the second highest priority. In this way, the unicast cell, the multicast cell, and the broadcast cell can be sent according to the priority.
  • Each user side connected to the transmission bus receives the cells on the transmission bus, and determines to transmit the cells to the corresponding user terminal according to the cell identifier and the needs of the user terminal.
  • each user side determines a user terminal that needs to receive the cell according to the characteristic information of the destination end of the cell, and restores the cell to a unicast datagram. And send it to the user terminal.
  • each user side determines a user terminal that needs to receive the cell according to the recorded request information, restores the cell to a multicast data packet, and sends the packet to the User terminal. If the request information is recorded on the network side, the network side should send the request information to the user side.
  • each user side restores the cell to a broadcast data message and sends it to all user terminals connected to itself.
  • the data packets sent by the network side can only be unicast data packets and multicast data packets. There are no broadcast data packets. Therefore, only these two types of packets need to be addressed. Text for processing.
  • the data message sent is an ATM cell
  • the ATM cell may include both a unicast data packet and a multicast data ⁇ :
  • the network side needs to form the ATM cell into a corresponding Ethernet frame, and tag the Ethernet frame with a VLAN ID according to the connection information, and then perform unicast and multicast distribution on the Ethernet frame. Multicast frames are transmitted separately.
  • the connection information refers to pre-configured exchange information on the DSLAM device, and is mainly the VPI / VCI on the ADSL port side. T N2004 / 000911 Correspondence with Ethernet VLAN ID, etc.
  • the Ethernet frame For a unicast frame, the Ethernet frame needs to be converted into a corresponding ATM message according to the destination MAC address or VLAN ID of the unicast frame, and according to the correspondence between the MAC address or VLAN and the user VC identifier, that is, VPI / VIC.
  • the ATM cell is then sent to the transmission bus.
  • the multicast frame For a multicast frame, the multicast frame needs to be converted into an ATM cell according to the correspondence between the multicast group and the multicast VC identifier, and then the ATM cell is sent to the transmission bus.
  • the user side receives the multicast ATM cells and unicast ATM cells belonging to the port according to the preset multicast reception table and unicast reception table, and multiplexes the received cells in the original cell order, and Send the multiplexed ATM cell to the RTU through the user VC;
  • the RTU recovers the received ATM cells into an Ethernet frame, and then sends the Ethernet frame to the user terminal.
  • the data packet sent by the user terminal to the user side is converted into an ATM cell by the RTU, and is carried in the user VC and sent to the user side.
  • the ATM cell directly add the unicast cell identifier and the characteristic information of the destination to the cell according to the VPI / VCI of the user VC, and pass the unicast message together with the cell, the unicast cell identifier, and the characteristic information of the destination.
  • the VC corresponding to the meta ID is sent to the transmission bus.
  • the network side After receiving a cell on the transmission bus, the network side determines whether the destination characteristic information of the cell meets its own receiving conditions. If it does, the ATM cell is converted to the Ethernet of the corresponding VLAN according to the VPI / VCI of the cell. Network frame, and record the correspondence between the source MAC address of the data packet and the user VC identifier, and then convert the Ethernet frame into an ATM cell, and send the ATM cell according to the correspondence between the VLAN and the network-side VC Go to the corresponding network-side VC.
  • Figure 4 shows the first system for data packet transmission. This system enables the network to send data packets to the user.
  • the transmission bus interface unit in this system leads the transmission bus interface on the backplane side, and is connected to the transmission bus through the derived transmission bus interface.
  • the ATM universal test and operation physical layer interface is led out on the transmission bus interface unicast board ( UTOPIA), and is connected to the user equipment interface unit through the UTOPIA.
  • various network equipment interface units or user equipment interface units can be flexibly connected to the transmission bus interface unit through UTOPIA, so that the network side and the user side can complete the transmission and reception of ATM cells.
  • Each interface unit has a unique identifier, and this identifier can be the port address of each interface unit. Because the transmission bus interface unit has a priority scheduling function, the cells that need to be currently sent to the transmission bus can be determined through a predetermined algorithm and priority.
  • the user-side transmission bus interface unit is connected to the user equipment interface unit, and the network-side transmission bus interface unit is connected to the network equipment interface unit.
  • the user equipment interface unit has multiple slots, each slot has a slot number, and each slot number can correspond to multiple user terminals.
  • three transmission bus interface units 400, 410, and 420 are connected to the transmission bus, and are respectively connected to the network equipment interface unit 430 and the user equipment interface units 440 and 450.
  • the transmission bus interface unit 400 and the network device interface unit 430 constitute a network-side interface device;
  • the transmission bus interface unit 410 and the user equipment interface unit 440 constitute a user-side interface device, and
  • the transmission bus interface unit 420 and the user equipment interface unit 450 constitute a user-side Interface equipment.
  • the network device interface unit 430 When the network device interface unit 430 receives a unicast data message to be transmitted, After the unicast data packet is converted into a cell, it is transmitted to the transmission bus interface unit 400 through the dedicated VC of the unicast cell; the transmission bus interface unit 400 adds a unicast cell identifier and the cell according to the cell's VCI and VPI. Specific information of the destination of the unicast cell. The specific information is the port number and slot number of the board at the destination, and then the unicast cell, the unicast cell identifier, and the unicast port number of the destination of the unicast cell. The slot numbers are sent to the transmission bus through the VC corresponding to the unicast cell identifier.
  • Each transmission bus interface unit 410 and 420 connected to the transmission bus receives the cell at the same time, determines that the cell is a unicast cell according to the unicast cell identifier of the cell, and determines whether the port number of the destination end of the cell is the same as that of the cell. Their own port addresses are the same. If they are the same, they are transmitted according to the slot number of the cell, and the user equipment interface unit sends them to the corresponding user terminal device according to the VPI and VCI of the cell; if they are not the same, then discard the Cell.
  • the slot number belongs to the user equipment interface unit 440, that is, the transmission bus interface unit 410 can determine that the destination port number of the cell is the same as its own port address, and then according to the slot of the cell
  • the cell is transmitted to the user equipment interface unit 440, and the user equipment interface unit 440 converts the cell into a data message, and sends the converted data message to the corresponding user terminal according to the VP CI of the cell. device.
  • the transmission bus interface unit 420 it is determined that the destination port number of the cell is different from its own port address, and therefore the cell is discarded. In this way, unicast cells are transmitted between transmission bus interface units on the transmission bus.
  • the multicast data message is converted and transmitted to the transmission bus interface unit 400 through the dedicated VC of the multicast cell; the transmission bus interface unit 400 according to The VCI / VPI of a cell adds a multicast cell identifier and a multicast group number to the cell, and sends the cell, the multicast cell identifier, and the multicast group number to the VC corresponding to the multicast cell identifier to the VC.
  • the VCI / VPI of a cell adds a multicast cell identifier and a multicast group number to the cell, and sends the cell, the multicast cell identifier, and the multicast group number to the VC corresponding to the multicast cell identifier to the VC.
  • Each transmission bus interface unit 410 and 420 connected to the transmission bus simultaneously interfaces the cell, determines that the cell is a multicast cell based on the cell's multicast cell identifier, and according to the recorded user request multicast data message Request letter Information and the multicast group number of the cell to determine whether the user terminal connected to itself needs the cell of the multicast group number. If the user terminal connected to the transmission bus interface unit 410 needs this cell, the transmission bus interface unit 410 Transmit it to the corresponding user equipment interface unit 440, the user equipment interface unit 440 converts the cell into a corresponding data message, and transmits the converted data message to the corresponding data message according to the VPI / VCI of the cell User terminal. If none of the user terminals connected to the transmission bus interface unit 420 need this cell, the transmission bus interface unit 420 discards the multicast cell. Thus, the transmission of multicast data between the transmission bus interface units on the transmission bus is realized.
  • the broadcast data message When the network device interface unit 430 receives the broadcast data message to be transmitted, the broadcast data message is converted into a cell, and then transmitted to the transmission bus interface unit 400 through the dedicated VC of the broadcast cell; the transmission bus interface unit 400 according to The VCI / VPI of the cell adds a broadcast cell identifier to the cell, and sends the cell along with the broadcast cell identifier to the transmission bus through the VPI corresponding to the broadcast cell identifier.
  • Each transmission bus interface unit 410 and 420 connected to the transmission bus receives the cell at the same time, determines that the cell is a broadcast cell according to the broadcast cell identifier of the cell, and then transmits the cell to users connected to itself.
  • a device interface unit, and the user equipment interface units 440 and 450 convert the broadcast cell into a corresponding broadcast data message, and transmit the broadcast data message to all user terminal devices connected to itself.
  • the transmission of broadcast cells between the transmission bus interface units on the transmission bus is realized.
  • Figure 5 shows the second system for data packet transmission.
  • the system includes a network-side interface device 500 and a user-side interface device 510. There is only one network-side interface device on the transmission bus, and there can be multiple user-side interface devices.
  • the network-side interface device 500 includes a transmission bus interface unit 501, a data message processing unit 502, and an interface conversion unit 503.
  • the transmission bus interface unit 501 has a priority scheduling function for determining a cell identifier corresponding to a cell transmitted by the data message processing unit 502, and transmitting the cell and the cell identifier to the transmission according to a predetermined algorithm and priority.
  • a bus; the interface unit further receives a cell and a cell identifier on the transmission bus, determines a cell to be transmitted to the data packet processing unit 502 according to the cell identifier, and performs transmission.
  • a data message processing unit 502 configured to convert a data message transmitted by the IP network through the interface conversion unit 403 into a cell, and transmit it to a transmission bus interface unit 501 with an arbitration function together with its corresponding cell identifier; the processing The unit also restores the cells transmitted by the transmission bus interface unit 501 into a request data message, and transmits them to the IP network through the interface conversion unit 503.
  • the interface conversion unit 503 is configured to provide an interface between the network-side interface device and the IP network.
  • the interface conversion unit may be a Fast Ethernet (FE) optical port, an FE electrical port, or a G-bit Ethernet optical port.
  • FE Fast Ethernet
  • the user-side interface device 510 includes a transmission bus interface unit 511, a cell bearing unit 512, and a user terminal access unit 513.
  • the transmission bus interface unit can be connected to multiple cell bearer units at the same time, and the cell bearer unit can also be connected to multiple user terminal access units, respectively.
  • the transmission bus interface unit 511 is configured to transmit the cells and the cell identifiers transmitted by the cell carrying unit 512 to the transmission bus; receive the cells on the transmission bus; and transmit the information according to the cell identifier and user requirements.
  • the cells are transmitted to the corresponding cell carrying unit 512.
  • the cell carrying unit 512 is configured to transmit the ATM cells transmitted from the user terminal access unit 513 to the transmission bus interface unit 511; and carry the ATM cells transmitted from the transmission bus interface unit 511 in a predetermined frame.
  • the VPI / VCI of the cell is transmitted to the corresponding user terminal access unit 513.
  • the cell bearing unit may be an asymmetric digital subscriber line chip, a high-speed digital subscriber line chip, or a high-bit digital subscriber line chip.
  • a user terminal access unit 513 configured to convert a request data message transmitted from the user terminal into a cell, and send the converted cell in a predetermined frame to the cell carrying unit 512; the access unit will also The cells carried in the predetermined frame transmitted by the cell carrying unit 512 are restored into corresponding data messages and transmitted to the user terminal.
  • Figure 6 shows a third system that implements data message transmission.
  • the user terminal in the system shown in FIG. 6 can send the ATM cell corresponding to the request data message to the transmission bus through the user side, and the network side obtains it according to the cell sent by the transmission bus.
  • a corresponding request data message and sending the message to the IP network according to the destination MAC address in the request data message.
  • the IP network After receiving the request data message, the IP network returns a corresponding data message to the user terminal.
  • transmission bus interface units 600, 610, and 620 are connected to the transmission bus in FIG. 6, and they are connected to user equipment interface units 630, 640, and 650, respectively;
  • the transmission bus interface unit 600 and data message processing Unit 630 constitutes a network-side interface device;
  • transmission bus interface unit 610 and user equipment interface unit 640 constitute a user-side interface device;
  • transmission bus interface unit 620 and user equipment interface unit 650 constitute a user-side interface device.
  • the transmission bus interface unit 600 is a transmission bus interface unit with a priority scheduling function on the network side, and the transmission bus interface unit 610 and the transmission bus interface unit 620 are transmission user interface unit on the user side.
  • the data packet processing unit 630 is a network equipment interface unit on the network side, and the user equipment interface unit 640 and the user equipment interface unit 650 are user equipment interface units on the user side, respectively.
  • the IP network 660 is connected to the data packet processing unit 630, and the user terminal 641, the user terminal 642, the user terminal 643, the user terminal 644, and the user terminal 645 are connected to the user equipment interface unit 540 and the user equipment interface unit 650, respectively.
  • This virtual connection includes unicast.
  • the VC corresponding to the cell identity, the VC corresponding to the multicast cell identity, and the broadcast cell identity to establish the correspondence between the VPI, the VCI, and the cell identity.
  • the cell identity includes a unicast cell identity, a multicast cell identity, and a broadcast cell identity. It is set that the user terminal 641 needs the IP network 660 to send a data message to it.
  • the user terminal 641 transmits the request data message to the user equipment interface unit 640, and the user equipment interface unit 640 converts the request data message into a cell and transmits the request data message to the transmission bus interface unit 610 through a permanent virtual connection corresponding to the unicast cell identifier.
  • the transmission bus interface unit 610 After receiving the cell transmitted by the user equipment interface unit 640, the transmission bus interface unit 610 adds a unicast cell identifier and a port number and data of the transmission bus interface unit 600 to the slot number of the text processing unit 630, and sends the The unit and unicast cell identifier are sent to the transmission bus together with the port number and slot number. If the information carried by the received cell is a request for the IP network 660 to send a multicast data packet to it, the request information for requesting the IP network to send a multicast data packet also needs to be recorded; the request information includes the group of the requested multicast data packet Broadcast group number and user terminal address information. The request information for a multicast data message can be recorded in any component device of the system that implements the data message transmission.
  • Each transmission bus interface unit connected to the transmission bus receives the cells on the transmission bus at the same time. After receiving the cells, the transmission bus interface unit 600 determines according to the cell identifier that the received cells are unicast cells, multicast cells, Still broadcasting cells. If the cell identifier is a unicast cell identifier, it is determined according to the port number that it should receive the cell, and is transmitted to the data packet processing unit 620 through the permanent virtual connection corresponding to the unicast cell identifier according to the slot number; other transmissions The bus interface unit 620 discards the received cell by judging that the port number of the cell is not consistent with its own port number.
  • the data packet processing unit 620 After receiving the unicast cell transmitted by the transmission bus interface unit 600, the data packet processing unit 620 restores the unicast cell to a request data packet, and according to the media access control of the request data packet The address is transmitted to the IP network 660.
  • the data message processing unit 630 receives a data message transmitted from the IP network 660.
  • the data packets transmitted by the IP network 660 include unicast data packets, multicast data packets, and broadcast data packets. ,
  • the data message processing unit 630 can identify the type of the data message by judging the MAC address of the received data message.
  • the IP network 660 transmits a data message corresponding to the request data message to the data message processing unit 630 according to the request data message of the user terminal 641.
  • the IP network 660 needs to send a broadcast data packet, the data packet transmission to the broadcast data packet processing unit 630.
  • the transmission bus interface unit 600 receives a cell transmitted by the data packet processing unit 630 from the permanent virtual connection corresponding to the unicast cell identifier, adds a unicast cell identifier to the cell, and determines the cell according to the VPI and VCI of the cell. Its corresponding destination port number and slot number. If this unicast data message is a unicast data message sent by the IP network requested by user terminal 641, add the port number and user equipment of the transmission bus interface unit 610 to the cell The slot number of the interface unit 640; and sends the cell, the unicast cell identifier, the port number, and the slot number to the transmission bus together.
  • the transmission bus interface unit 600 receives a cell transmitted by the data packet processing unit 630 from the permanent virtual connection corresponding to the multicast cell identifier, and adds a multicast cell identifier and a multicast Group number; and send the cell with the multicast cell identifier and the multicast group number to the transmission bus.
  • the transmission bus interface unit 600 receives a cell transmitted by the data message processing unit 630 from the permanent virtual connection corresponding to the broadcast cell identifier, adds a broadcast cell identifier to it, and sends the cell and the broadcast cell identifier to the transmission together. bus.
  • the transmission bus interface unit 600 is a transmission bus interface unit with an arbitration function. When there are multiple cells converted from data packets that need to be sent, the transmission bus interface unit 600 may determine which transmission is allowed according to a predetermined algorithm and a predetermined priority. Cell.
  • Each transmission bus interface unit 610 and 620 receives a cell on the transmission bus.
  • the transmission bus interface unit 610 judges whether the received cells are unicast cells, multicast cells, or broadcast cells based on the cell identification.
  • the cell identifier of the cell received by the transmission bus interface unit 610 is a unicast cell identifier, then it is determined according to the port number of the cell whether it is the same as its own port number, and if it is the same, the unicast cell is passed according to the slot number. Identifies the corresponding permanent virtual connection and transmits it to the corresponding slot in the user equipment interface unit 640.
  • the user equipment interface unit 640 restores the cells transmitted by the transmission bus interface unit 610 to a unicast data packet, and according to the unicast data packet
  • the destination MAC address of the text transmits the unicast data ⁇ : the text to the user terminal 641. If not, the received cells are discarded.
  • the transmission bus interface unit 620 also processes the received cells according to the above method.
  • the transmission bus interface unit 610 If the cell identifier of the cell received by the transmission bus interface unit 610 is a multicast cell identifier, transmitting the cell to the corresponding slot of the user equipment interface unit 640 according to the recorded request information of the requested multicast data message, The user equipment interface unit 640 restores the cells transmitted by the transmission bus interface unit 610 to a multicast data message, and transmits the cells to the corresponding user according to the recorded request information. The other transmission bus interface unit 620 transmits the received cell to the corresponding user through the recorded request information of the request multicast data message.
  • the cell identifier of the cell received by the transmission bus interface unit 610 is a broadcast cell identifier
  • the cell is transmitted to each slot of the user equipment interface unit 640, and the user equipment interface unit 640 restores the cells transmitted by the transmission bus interface unit 610 into broadcast data messages, and transmits them to all user terminals connected to them.
  • the transmission bus interface unit 620 also transmits the cells received from the transmission bus to all user terminals connected to it according to the method described above.
  • FIG 7 shows a fourth system for data packet transmission.
  • This system is based on IP interface digital subscriber line access multiplexing equipment (IP DSLAM).
  • IP DSLAM IP interface digital subscriber line access multiplexing equipment
  • DSLAM is mainly composed of two service boards. These two service boards are a network interface board and a user interface board.
  • the main role of the network interface board is to provide a network-side interface for the DSLAM to connect the DSLAM equipment with the user terminal access unit (CPE).
  • CPE user terminal access unit
  • the user interface board and the user terminal access unit together form the user-side interface equipment in the DSLAM.
  • the network interface board 700 in the DSLAM includes a transmission bus interface unit 701, a data message processing unit 702, and a LANSWITCH chip 703.
  • the network interface board 700 is a network-side interface device
  • the transmission bus interface unit 701 is a transmission bus interface unit with an arbitration function on the network side.
  • the data packet processing unit 702 and the LANSWITCH chip 703 constitute the network device interface unit of the present invention.
  • the user interface board 710 in the DSLAM includes a transmission bus interface unit 711, an ADSL chip 712, and an ADSL chip 713.
  • ADSL chip 711 k CPE 730 is connected and forms a user equipment interface unit;
  • ADSL chip 712 is connected with CPE 740 and CPE 750 and forms a user equipment interface unit.
  • the user interface board 610 and the CPE 730, CPE 740, and CPE 750 together form a user-side interface device.
  • the IP network 720 is connected to the LANSWITCH chip 703, and the user terminals 731, 741, and 751 are connected to the user terminal access units CPE 730, CPE 740, and CPE 750, respectively.
  • the VC includes a VC corresponding to a unicast cell identifier, a VC corresponding to a multicast cell identifier, and a VC corresponding to a broadcast cell identifier. And establish the correspondence between VPI / VCI and cell identity.
  • the cell identity includes a unicast cell identity, a multicast cell identity, and a broadcast cell identity.
  • data communication is performed between the IP network and the user terminal through a DSLAM, and a protocol processing process thereof is shown in FIG. 8.
  • the user terminal sends a data packet to the IP network in the uplink direction, and the protocol processing method in the uplink direction is:
  • IP network data message sent by the user terminal is processed by the computer's protocol stack, encapsulated into an Ethernet frame, and then sent to the CPE;
  • the CPE After receiving the Ethernet frame, the CPE divides the data of the IP network into standard ATM cells according to the 1483B / AAL5 protocol, and then carries the ATM cells in the ADSL frame and sends it to the user interface board. ;
  • the user interface board recovers ATM cells from the ADSL frame, and sends the ATM cells to the network interface board through the transmission bus;
  • the network interface board composes the received ATM cells into an Ethernet frame according to the 1483B / AAL5 protocol, and sends the Ethernet frame to the IP network.
  • the data packet sent by the IP network to the user terminal is in the downlink direction.
  • the protocol processing process in the downlink direction is opposite to the uplink direction, so it will not be described again.
  • the user terminal 731 needs the IP network 720 to send a data message to the user, then the user terminal 731 transmits a request data message to the CPE 730, and the CPE 730 converts the request data message into a cell and the cell
  • the bearer carried in the ADSL frame is transmitted to the ADSL chip 712 through the VC corresponding to the unicast cell identifier; the ADSL chip 712 transmits the cell carried in the ADSL frame to the transmission bus interface unit 711 through the VC corresponding to the unicast cell identifier.
  • the DSLAM needs to record the request information of the multicast data message, that is, the multicast group number and user of the multicast data message. Address information of the terminal 731.
  • the request information can be recorded in DSLAM In any of its constituent units.
  • the ADSL chip 712 transmits the received cell to the transmission bus interface unit 711, and the transmission bus interface unit 711 adds a unicast cell identifier, the port number of the transmission bus interface unit 711, and the data packet processing unit 730 to the cell.
  • the slot number is sent to the transmission bus through the VC corresponding to the unicast cell together with the unicast cell identifier, the port number, and the slot number.
  • Each transmission bus interface unit connected to the transmission bus receives a cell on the transmission bus at the same time. After receiving the cell, the transmission bus interface unit 701 determines that the cell is a unicast cell according to the unicast cell identifier. According to the port number carried by the cell, it is determined that the local port should receive the cell, so the VC corresponding to the unicast cell identifier is transmitted to the data packet processing unit 702 according to the slot number. Of course, other transmission bus interface units connected to the transmission bus discard the cell according to the port number carried by the cell and its own port number.
  • the data packet processing unit 702 After receiving the unicast cell transmitted from the transmission bus interface unit 701, the data packet processing unit 702 restores the cell to a request data packet, and according to the request data packet MAC address, sends the request through the LANSWITCH chip 703 The data is transmitted to the IP network 720.
  • the IP network 720 sends a data packet to the user terminal 731, which is specifically transmitted to the data packet processing unit 702 through the LANSWITCH chip 703.
  • the data packets transmitted by the IP network 720 may be unicast data packets, multicast data packets, and broadcast data packets. Since the MAC addresses of the unicast data message, the multicast data message, and the broadcast data message are different, the data message processing unit 702 can identify the type of the data message by determining the MAC address of the received data message.
  • the IP network 720 transmits the data message corresponding to the request data message of the user terminal 731 to the data message processing unit 702 through the LANSWITCH chip 703.
  • Data message The processing unit 702 converts the received data message into a cell according to the MAC address.
  • the cell should be a unicast cell and transmitted to the transmission bus interface unit 701 through the VC corresponding to the unicast cell identifier; if it is a multicast Data message, the cell should be a multicast cell, and transmitted to the transmission bus interface unit 701 through the VC corresponding to the multicast cell identifier; if it is a broadcast data message, the cell should be a broadcast cell And transmit the VC corresponding to the broadcast cell identifier to the transmission bus interface unit 701.
  • the transmission bus interface unit 701 adds a unicast cell identifier to a cell transmitted from the VC corresponding to the unicast cell identifier, and determines the port number and slot number of the corresponding transmission bus interface unit 711 according to the VPI VCI of the cell, and The port number and slot number are added to the cell, and the cell is sent to the transmission bus through the VC corresponding to the unicast cell together with the unicast cell identifier and the port number slot number.
  • the transmission bus interface unit 701 adds a multicast cell identifier and a multicast group number to a cell transmitted from the VC corresponding to the multicast cell identifier, and passes the cell, the multicast cell identifier, and the multicast group number together through the group.
  • the VC corresponding to the broadcast cell identifier is sent to the transmission bus.
  • the transmission bus interface unit 701 adds a broadcast cell identifier to a cell transmitted from the VC corresponding to the broadcast cell identifier, and sends the cell and the broadcast cell identifier to the transmission bus through the VC corresponding to the broadcast cell identifier.
  • a transmission bus interface unit 711 connected to the transmission bus receives a cell on the transmission bus.
  • other transmission bus interface units connected to the transmission bus also receive the cell.
  • each transmission bus interface unit After each transmission bus interface unit receives the cell, it judges which cell is the received cell according to the cell identifier. After determining the type of the cell, it is determined whether the interface unit receives the cell or discards the cell according to the related information of the cell.
  • the transmission bus interface unit 711 determines that the port number of the cell is the same as its own port number, and then uses the VC corresponding to the unicast cell identifier to identify the cell.
  • the data is transmitted to the ADSL chip 712 corresponding to the slot number in the cell, and the ADSL chip 712 carries the cell in an ADSL frame, and transmits it to the CPE 730 through the VC corresponding to the unicast cell identifier.
  • the CPE 730 restores the cells in the received ADSL frame to a unicast data message, and transmits it to the user 731 according to the destination MAC address of the unicast data message.
  • Other transmission bus interface units connected to the transmission bus discard the cell by judging that the port number of the cell is not consistent with its own port number.
  • the transmission bus interface unit 711 determines that the user is a user to which the interface unit belongs according to the user address information in the recorded request information of the requested multicast data message, and therefore the The VC corresponding to the cell identification transmits the cell to the ADSL chip 712.
  • the ADSL chip 712 carries it in an ADSL frame and transmits it to the CPE 730 through the VC corresponding to the multicast cell identifier.
  • the CPE 730 restores the cells in the received ADSL frame to a multicast data message, and transmits it to the user terminal 731 according to the destination MAC address of the multicast data message.
  • the transmission bus interface unit 711 uses the user address information in the recorded request information of the requested multicast data message, and identifies the corresponding VC through the multicast cell.
  • the cell is transmitted to the ADSL chip 713 to which the user terminal 741 belongs.
  • the ADSL chip 713 carries the cell in an ADSL frame, and transmits the frame to the CPE 740 through the VC corresponding to the multicast cell identifier.
  • the CPE 740 restores the cells in the received ADSL frame to a multicast data message, and transmits it to the user terminal 741 according to the destination MAC address of the multicast data message. If other transmission bus interface units determine that the user address in the request message does not belong to this interface unit, the cell is discarded.
  • the transmission bus interface unit 711 determines that the cell is a broadcast cell according to the broadcast cell identifier
  • the VC corresponding to the broadcast cell identifier is transmitted to the ADSL chips 712 and 713
  • the ADSL chips 712 and 713 carry the cell
  • the ADSL frame is transmitted to the CPEs 730, 740, and 750 through the corresponding VC of the broadcast cell identifier.
  • CEP 730, 740 and 750 restore the cells in the ADSL frame to a broadcast data message, and transmit the broadcast data message to the user terminals 731, 741, and 751 according to the destination MAC address of the broadcast data message, respectively.
  • Other transmission bus interface units also transmit the broadcast data message to the corresponding users in the same way.
  • the user terminal may send a data packet requesting to join a certain multicast group to the user side. After receiving the request data packet, the user side converts the request data packet into an ATM cell and sends it to the ATM cell. Transmission bus; the network side receives the ATM cell from the transmission bus, and obtains a request data message corresponding to the ATM cell, and then records the VC identifier of the user and the multicast group to be joined according to the request data message
  • the main control module is requested to authenticate the authority of the user through the message channel.
  • the main control module determines whether there is a multicast VC for the multicast group. If it exists, it directly The user port is added to the multicast VC; otherwise, a multicast VC is established, and the user port is added to the multicast VC.
  • a protocol processing module may be added to the system shown in FIG. 7, the ATM cell is converted into a request data message by the protocol processing module, and an authentication request is sent to the main control module.
  • Figure 9 shows a system for data packet transmission for ATM networks, which is based on ATM DSLAM.
  • the network interface board 900 includes a transmission bus interface unit 901, a unicast message processing unit 903, a multicast message processing unit 902, and a protocol conversion module 904.
  • the RTU 930 is connected to the ADSL chip 912 in the user interface board 910, and the RTU 940 and 950 are connected to the ADSL chip 913.
  • the ADSL chip completes the functions of user ADSL line adaptation, access, and convergence of multicast VC and unicast VC.
  • one end of the network-side VC in FIG. 9 is terminated at the BAS device of the upper layer network, and one end is terminated at the protocol processing module, and the AVC network, the DSLAM uplink interface, and the ATM space bus are interposed in the middle.
  • the AVC network, the DSLAM uplink interface, and the ATM space bus are interposed in the middle.
  • multiple pieces are provided.
  • One end is terminated on each RTU, and the other end is terminated on the protocol processing module.
  • the user RTU, ADSL interface board, and ATM space bus are interposed.
  • the downlink forwarding process will be described.
  • the processing in the downstream direction is shown in Figure 10.
  • the ATM cells carried on the network-side VC are first converted by the protocol conversion module from ATM to IP, and the cells are composed into Ethernet frames, and the Ethernet is based on the correspondence between the network-side VC and the VLAN.
  • the network frame is marked with the corresponding VLAN ID, and then the Ethernet frame is unicasted and multicasted. Because the destination MAC address of the unicast frame is different from the destination MAC address of the multicast frame, the unicast can be achieved by the destination MAC address.
  • the unicast frame enters the unicast message processing unit 903 in FIG. 9, and the multicast frame enters the multicast message processing unit 902 in FIG. 9.
  • the multicast forwarding module converts a multicast Ethernet frame into an ATM cell according to the corresponding relationship between the multicast group (1,2) and the multicast VC (VC1, VC2), and adds a multicast group number and an ATM cell to the ATM cell.
  • the multicast cell identification, and the transmission bus interface unit 801 sends the ATM cell to the ATM bus through the multicast VC.
  • the unicast forwarding module converts the Ethernet frame into an ATM cell corresponding to the user VC according to the destination MAC address or VLAN of the unicast Ethernet frame.
  • a cell identifier and destination characteristic information are added to the element, and are transmitted to the bus by the transmission bus interface unit 901 through a unicast VC.
  • the user-side transmission bus interface unit 911 receives the ATM cell on the transmission bus, and transmits the ATM cell to the ADSL chip. Specifically, the transmission bus interface unit 911 Determine whether the receiving conditions are met according to the feature information of the destination and the unicast / multicast identifier carried by the cell. If so, remove the unicast / multicast identifier carried in the cell, strip the feature information of the destination, and The feature information of the destination sends the cell to the corresponding ADSL chip.
  • the ADSL chip receives the group of speech belonging to the port according to the set multicast receiving table, and receives the unicast cells belonging to the user VC on the port according to the set unicast receiving table.
  • the elements are multiplexed together to the user VC in the original cell order, so that a user VC can simultaneously transmit unicast cells and multicast cells. It should be pointed out that when an Ethernet frame is carried on an ATM, the cells cannot be out of order. Before the cells divided by an Ethernet frame are transmitted, the cells of other frames cannot be transmitted on the line.
  • a multicast Ethernet frame in an Ethernet frame is divided into four cells eight, B, C, and D, and a unicast Ethernet frame in the Ethernet frame is divided into four 1, 2, 3, and 4 Cells are sent by the sender in the order of ABCD1234. After the Ethernet frame reaches the receiver through multiple intermediate exchanges, the order of the cells cannot be changed.
  • the RTU After receiving the ATM cell sent by the ADSL chip, the RTU recovers the cell into an Ethernet frame and sends it to a user terminal such as a user computer or a set-top box.
  • multicast can not be completed through point-to-multipoint replication, but the internal ATM bus is used to implement multicast.
  • Each user port receives the multicast data on the bus according to the multicast group in which it is located, without the need for the CPU to perform cell replication, which also saves the bandwidth occupied by the device.
  • multiple multicast group data on the network side are carried on a VC, multiple multicast streams can be provided by one multicast server, which can effectively save uplink connection resources and equipment investment, and is also beneficial to networking. simplify.
  • multiple user VCs can converge to one network-side VC, and the network-side VC can carry both unicast data packets and multicast data packets, which reduces maintenance costs and saves network resources.
  • the processing in the uplink direction is shown in Figure 11. Specifically, the Ethernet frame sent by the user terminal is decomposed into ATM cells by the RTU and sent to the ADSL chip through the user VC.
  • the ADSL chip sends the ATM cell to the user-side transmission bus interface unit.
  • the transmission bus interface unit After receiving the ATM cell, the transmission bus interface unit directly adds a unicast cell identifier to the ATM cell according to the VPI VCI of the user VC. And the characteristic information of the destination, and send the cell, the unicast cell identifier, and the characteristic information of the destination to the transmission bus together.
  • the transmission bus interface unit on the network side determines that the received ATM cell is the cell it should receive according to the characteristic information of the destination end of the cell, and then sends the ATM cell to the unicast message processing module and the unicast message processing module. Convert the ATM cell into an Ethernet frame according to the cell's VPI / VCI, record the correspondence between the source MAC address and the user's VC identifier, and then send the Ethernet frame to the protocol conversion module. The protocol conversion module then uses the VLAN and The corresponding relationship of the network VC converts the Ethernet frame into ATM cells, and sends the ATM cells to the network-side VC, and the network-side VC sends the ATM cells to the ATM network.
  • the unicast message processing module may not perform Ethernet frame conversion on the ATM cell and learn the source MAC address. Instead, the unicast message processing module may perform the mapping based on the correspondence between the user VC and the network VC Send the ATM cell directly to the network-side VC.
  • the transmission bus interface unit connected to the transmission bus on the network side has a priority scheduling function, and implements cell transmission according to the arbitration function.
  • the data multiplexing in the upstream channel is jointly completed by the ATM backplane bus and the bus interface chip.
  • each interface chip connected to the transmission bus needs to send data to the transmission bus, it must obtain the token given by the arbiter; the token can be handed over after a complete frame of data is sent. This ensures that the services of multiple ADSL interface boards are aggregated into the strict framing in the protocol processing module, and no cell disorder occurs.
  • the point between the protocol processing module and the uplink interface board is a point-to-point channel, and there is no problem of multiplexing multiple data streams.
  • the multiplexing method of sending data on different ports of the same ADSL interface board is still statistically complex. use.
  • the bus interface chip sends the cells of each ADSL port in a round-robin manner. Each port sends a complete frame before sending data for the next port. This ensures that when an ADSL interface board is sent to the bus, it is also sent in frames, and no cell disorder occurs.
  • ATM DSLAM internally implements multicasting through the ATM space bus, which saves system resources and improves efficiency.
  • Multicast is not completed through point-to-multipoint replication, but instead uses the internal ATM space bus to implement multicast.
  • Each user port receives the multicast data on the bus according to the multicast group in which it is located. It does not require the CPU to perform cell replication, and saves Bandwidth occupied by the device.
  • multiple multicast group data can be carried on a VC.
  • multiple multicast streams can be provided by a multicast server to effectively save uplink connections.
  • Investment in resources and equipment is also conducive to simplification of networking; network-side multicast data streams and unicast data streams can also be carried on a VC to save uplink connection resources and reduce the maintenance workload of operator maintenance personnel.
  • the multicast data stream and unicast data stream can be carried on one VC, which is of great significance for simplifying the configuration of the terminal.
  • the unicast data and multicast data on the terminal side are carried on one VC, which can avoid the increase of When starting a multicast service, a large number of user terminals need to be reconfigured, which can also greatly reduce the workload of maintenance personnel.
  • the network interface board shown in FIG. 9 can also add a protocol processing module, and add a single board as a master control module on the transmission bus.
  • the main control module provides functions such as authentication of user multicast rights, management of user multicast channels, management of multicast users, data configuration, and provision of uplink interfaces.
  • the protocol processing module performs functions such as protocol conversion between ATM and Ethernet, capture of IGMP application messages, IGMP querier, and IGMP PROXY. If a protocol processing module is set, the module can also implement multicast and unicast data. Of the diversion.
  • the IGMP request is a module implemented using high-speed logic and works at the bottom. It mainly captures the message according to the format of the IGMP application message and reports it to the high-level software.
  • IGMP querier is a high-level software implementation
  • a function is to periodically send a general group query to all ADSL users to determine the user's multicast group joining status.
  • the IGMP PROXY module is also a function implemented by high-level software. It mainly performs proxy services for user requests and leave messages reported to the multicast router, and responds to general group queries and specific group queries sent by the multicast router on behalf of ADSL users. The main purpose is It is to reduce the traffic impact on the multicast router and improve the multicast efficiency.
  • the ATM DSLAM equipment after adding the main control module and protocol processing module can be set in the form shown in Figure 12.
  • users connected to ATM DSLAM devices can also dynamically join or leave multicast groups as needed, and after users leave, ATM DSLAM no longer sends multicast data to the user port.
  • the process for a user to join a multicast group is shown in Figure 13, and the specific process is as follows: After the user opens a multicast application, the computer sends a message requesting to join a multicast group, and the request message is The RTU is decomposed into ATM cells and exchanged to the network-side protocol processing module through the corresponding user VC.
  • the protocol processing module forms the ATM cells into an Ethernet frame, that is, according to the protocol carried on the ATM by the Ethernet frame RFC1483B, restore the frame of 1483B into an Ethernet frame; the underlying hardware logic recognizes this message according to the standard IGMP protocol, and captures it to the software of the protocol processing module.
  • the software uses the request message to identify the user VC ID and the user request
  • the joined multicast group is recorded in the user table, and at the same time, a high-level message is sent to the main control module through the message channel, requesting the authorization of the user.
  • the main control module After the main control module passes the authentication, it sends a response to the protocol processing module.
  • Establish a multicast VC connection for this multicast group send a message to notify the ADSL interface board, and then add the user port To the multicast VC in.
  • the function of the IGMP querier sends a multicast general query to all ADSL users through the user VC at a certain interval. If a user does not send a response message for a long time, the user is considered to have left the multicast group. The other is that when a user computer supporting the IGMP V2 protocol leaves a multicast group, it sends a leave multicast group message to the upper-layer network. After capturing the message, the protocol processing module determines that the user has left a specific multicast group. Broadcast group.
  • the protocol processing module After determining that a user leaves a multicast group, the protocol processing module sends a high-level message to the main control module, and the main control module sends a message to the user interface board to delete the user port from the corresponding multicast VC. In this way, the user will No more data messages will be received from this multicast group.
  • the interface unit connected to the transmission bus will have a priority scheduling function, but for the user-side transmission bus interface unit, the data packets transmitted to the transmission bus may only be unicast data packets Therefore, the priority scheduling function of the interface unit can be disabled.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne un procédé et un système de mise en oeuvre d'émission de paquets de données. Ce procédé comporte plusieurs opérations. On commence par établir un bus de transmission relié au port émission et au port réception. On définit les cellules qui sont transmises par le bus de transmission. Le port émission convertit alors les paquets de données qui sont à transmettre, et on envoie les cellules au bus de transmission. Enfin, on transmet le paquet de données correspondant à la cellule en fonction de l'information portée par la cellule. L'invention concerne également un système de mise en oeuvre d'émission de paquets de données avec diffusion unique ou multiple entre le réseau et l'utilisateur, plus particulièrement lorsque le réseau doit transmettre un certain nombre de paquets de données multiples, ce qui économise des ressources réseau et améliore l'efficacité de la transmission par le réseau, grâce au découpage en cellules des paquets de données en diffusion multiple et à la transmission par le bus de transmission pour réduire le coût de la communication, étant donné que l'appareil de communication accepte le même nombre d'utilisateurs.
PCT/CN2004/000911 2003-08-07 2004-08-06 Procede et systeme de mise en oeuvre d'emission de paquets de donnees WO2005015837A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CNB031439934A CN100546263C (zh) 2003-08-07 2003-08-07 空间多播数字用户线接入复接器组播业务实现方法和装置
CN03143993.4 2003-08-07
CN03154146.1 2003-08-12
CNB031541461A CN100358319C (zh) 2003-08-12 2003-08-12 一种实现数据报文传输的方法和系统
CN03154294.8 2003-08-19
CNB031542948A CN1327664C (zh) 2003-08-19 2003-08-19 异步传输模式数据流的转发装置及方法

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CN111786890A (zh) * 2020-06-29 2020-10-16 新华三信息安全技术有限公司 一种组播报文发送方法、相关装置和网络设备
CN114338448A (zh) * 2021-12-29 2022-04-12 北京天融信网络安全技术有限公司 性能测试方法、装置、电子设备及存储介质
CN115632979A (zh) * 2022-12-19 2023-01-20 成都菁蓉联创科技有限公司 一种通信数据转发方法、系统及存储介质

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CN1396748A (zh) * 2001-07-11 2003-02-12 日本电气株式会社 分组处理装置
CN1422508A (zh) * 2000-03-23 2003-06-04 西门子移动通讯公司 用于处理按照可变长度信元组织的数据的通信方法和系统

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CN1396748A (zh) * 2001-07-11 2003-02-12 日本电气株式会社 分组处理装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111786890A (zh) * 2020-06-29 2020-10-16 新华三信息安全技术有限公司 一种组播报文发送方法、相关装置和网络设备
CN111786890B (zh) * 2020-06-29 2022-05-27 新华三信息安全技术有限公司 一种组播报文发送方法、相关装置和网络设备
CN114338448A (zh) * 2021-12-29 2022-04-12 北京天融信网络安全技术有限公司 性能测试方法、装置、电子设备及存储介质
CN114338448B (zh) * 2021-12-29 2024-02-20 北京天融信网络安全技术有限公司 性能测试方法、装置、电子设备及存储介质
CN115632979A (zh) * 2022-12-19 2023-01-20 成都菁蓉联创科技有限公司 一种通信数据转发方法、系统及存储介质

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