KR20040051361A - Access Gateway System Using Multimedia Service And Multimedia Service Method - Google Patents

Abstract

PURPOSE: An access gateway system for a multimedia service and a method for a service thereof are provided to concentrate packet routing/forwarding engines on L2 switch cards and connect voice and data cards of a service sub-system with the L2 switch cards through inexpensive high speed ethernet links, thereby improving the extensibility and the flexibility of a system. CONSTITUTION: A service control card(75) controls a VoIP(Voice over IP) voice service and an Internet service. A service sub-system connects with voice or data service subscribers, and includes a plurality of voice cards(50-1 - 50-n), a plurality of data cards(60-1 - 60-n), and the service control card(75). A routing/switch sub-system connects to a VoP IP(Voice over Packet IP) network or the Internet for routing and forwarding IP packets to the cards. The routing/switch sub-system includes a plurality of packet cards(80-1,80-2), a plurality of L2 switch cards(70), and a routing control and switch module(90). The plurality of packet cards(80-1,80-2) connect to the VoP IP network for transmitting and receiving VoIP packets or connect to the Internet for transmitting and receiving Internet IP datagram. The plurality of L2 switch cards(70) concentrate ethernet links of the cards belonging to the service sub-system, and make an ethernet MAC(Media Access Control) frame of the individual card into IP packets to route or forward the IP packets to the voice card or the data card corresponding to a target IP address. The routing control and switch module(90) controls a routing and switching function to the IP packets and exchanges data.

Description

Access Gateway System Using Multimedia Service And Multimedia Service Method

The present invention relates to an access gateway for a multimedia service. In particular, in a system for processing a subscriber card, that is, a voice card and a data card, routing and forwarding processing of IP packets is performed in an L2 switch card connected to a separate card and a fast Ethernet link. The present invention relates to an access gateway system for a multimedia service and a service method thereof.

The recent proliferation of the Internet has allowed Internet users to use their own IP address or e-mail address for data or multimedia communications, and without using a regular telephone over a public switched telephone network (PSTN) network. It is possible to communicate with the other party in the remote place, for example, voice over IP (Voice over IP) service through the low-cost Internet is actively performed mainly by a separate carrier.

As an example of such a VoIP service through the Internet, conventionally, as shown in FIG. 1, the Voice over Packet (VoP) IP network is distinguished from the general Internet, and thus related to the call quality provided in the general PSTN. We wanted to build a next-generation communication network that can guarantee the quality of service (QoS) of voice packets, which is replaced by IP-based access gateways and softswitches. It provides the economics and scalability of the equipment.

Therefore, the service provider benefits from the efficient operation of the circuit and network and the economics of the open product, but there is a problem that the subscriber using the actual service does not have any additional benefits, especially the Digital Subscriber Line Access that accesses the Internet. As each module and access gateway exist independently, subscribers have to subscribe to voice service and data service separately. For this reason, it is difficult to provide integrated service for voice and data even in the case of telecommunication operators. .

Due to this problem, the applicant of the present invention completely separates the VoP IP network, which is the core network for guaranteeing QoS related to the call quality, such as VoIP service, and the existing best-in-class network, physically or logically, for voice and various additional services for subscribers. In order to provide the multimedia service of the Internet and the Internet as a single integrated telephone number, the next-generation communication network as shown in FIG. 2 is configured. The VoIP gateway as shown in FIG. A plurality of voice cards 10-1 to 10-n for accommodating subscriber lines for voice services, a plurality of data cards 20-1 to 20-n for accommodating internet access for data services, and system services Control and switch module (25) for exchanging data and exchanging data with VoP IP network to transmit VoIP packets It is configured to include a packet card (30-1, 30-2) for transmitting and receiving Internet IP datagram by accessing the Internet, which is a new or best network, and the received IP packet is stored inside each of the cards (10, 20, 30). By providing a packet routing / forwarding engine for routing and forwarding, respectively, it provides a multimedia service that allows simultaneous access to the VoP IP network and the Internet, but completely separates them so that they do not affect each other.

By the way, the above-described access gateway for multimedia services has the advantage of providing a multimedia service while guaranteeing QoS by providing a voice card and a data card without providing a separate DSLAM and equipment. However, a voice card, a data card, and a packet card are provided. System switches to interwork through the internal system bus and performs the routing and forwarding process of IP packets, and implements an access gateway system by independently implementing an expensive packet routing / forwarding engine on an individual card. In order to change the capacity, the internal system bus must be changed, and accordingly, individual cards must be changed. Also, as the packet routing / forwarding engine is implemented for each individual card, the possibility of proportional reduction is poor. , Individual car There was a problem of price rise in the overall cost of the expensive system.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to concentrate a packet routing / forwarding engine on an L2 switch card, which performs routing and forwarding processing for IP packets in an access gateway system, and provides a voice of a service subsystem. Individual cards, such as cards or data cards, connect with L2 switch cards over low-cost, high-speed Ethernet links, so that even if you change the capacity of the routing / switch subsystem to implement an access gateway system, It is to improve the scalability and flexibility of the system by using the application system software of the access gateway as it is.

Another object of the present invention is to improve the possibility of proportional reduction in the implementation of the access gateway system by concentrating on the L2 switch card without providing a packet routing / forwarding engine for each of the voice cards or data cards constituting the access gateway system. To reduce the overall cost of implementation of the system.

1 is a diagram schematically illustrating a next-generation communication network in which a VoIP service communication network and a VoP IP network are conventionally divided over the Internet.

2 is a schematic illustration of a next-generation communication network including a conventional access gateway for multimedia services.

FIG. 3 is a diagram showing an internal configuration of an access gateway for a multimedia service in FIG. 2; FIG.

4 is a diagram illustrating an internal configuration of an access gateway system for a multimedia service according to the present invention.

FIG. 5 is a diagram showing a detailed configuration of a sound card in FIG. 4; FIG.

FIG. 6 is a diagram showing a detailed configuration of a data card in FIG. 4; FIG.

FIG. 7 is a diagram showing a detailed configuration of an L2 switch card in FIG. 4; FIG.

FIG. 8 is a diagram showing a detailed configuration of a packet card in FIG. 4; FIG.

Explanation of symbols on the main parts of the drawings

50-1 to 50-n: sound card 51: POTS line interface

52: DSP 53, 62, 65, 72, 82: controller

54, 63: Ethernet interface unit 60-1 to 60-n: data card

61 xDSL / Cable Modem Interface

64,71: Ethernet Interface and L2 Switch

70: L2 switch card 73, 83: packet routing / forwarding engine

75: service control card 80-1, 80-2: packet card

81: L2 link interface unit 90: routing control and switch module

A feature of the present invention for achieving the object described above includes at least one voice card for IP packetization and delivery of subscriber voice in a next generation communication network, and at least one data card for providing Internet access to the subscriber side. An access gateway system for a multimedia service, comprising: a service control card for controlling a VoIP voice service and an Internet service; A service subsystem for connecting with a voice or data service subscriber and having said voice card, data card and service control card; The present invention provides an access gateway system for a multimedia service including a routing / switch subsystem connected to a VoP IP network or the Internet and performing routing and forwarding functions for IP packets of individual cards.

The routing / switch subsystem may include: a packet card for connecting to a VoP IP network to transmit and receive VoIP packets, or for connecting to the Internet to transmit and receive Internet IP datagrams; Aggregate Ethernet links of individual cards belonging to the service subsystem, IP packetize the Ethernet MAC frames of the individual cards, and route / forward to the packet card connected to the VoP IP network or the Internet, or forward the VoIP packet and the Internet IP packet to a destination. An L2 switch card for transferring the voice card or the data card corresponding to the IP address; And a routing control and switch module for controlling routing and switching functions for IP packets and exchanging data.

The L2 switch card, the packet card, and the routing control and switch module interoperate with each other through an internal data and control bus which is a system bus.

The L2 switch card further includes: an Ethernet interface and an L2 switch for converging the Ethernet of the voice card and the data card and the service control card and exchanging Ethernet MAC frames belonging to the service subsystem; An IP packet buffer and a packet routing / forwarding table are provided to forward the IP packet to a packet card connected to a VoP IP network or a packet card connected to the Internet through an internal system bus based on the packet routing table, and received from a corresponding packet card. A packet routing / forwarding processor for transmitting an IP packet; Extract the IP packet from the Ethernet MAC frame received from the Ethernet interface and the L2 switch and deliver the IP packet to the packet routing / forwarding processor, or wrap the Ethernet MAC address of an individual subscriber line in the IP packet received from the packet routing / forwarding processor. And a controller for transmitting, distributing and controlling the Ethernet interface and the L2 switch.

Furthermore, the packet card may include: an L2 link interface unit for transmitting and receiving an IP packet by connecting a Gigabit Ethernet, Fast Ethernet, POS, and ATM link connected to a VoP IP network or the Internet; An IP packet buffer and a packet routing / forwarding table to route / forward IP packets to the L2 switch card via an internal system bus based on the packet routing table, or to deliver IP packets received from the L2 switch card. A forwarding processor; And a controller configured to transfer the IP packet received from the L2 link interface unit to the packet routing / forwarding processor, or to transfer and control the IP packet received from the packet routing / forwarding processor to the L2 link interface unit. .

Meanwhile, the routing / switch subsystem allocates and manages an IP address assigned to a voice card and an IP subnetwork address of an L2 switch card, and manages an IP subnetwork address provided by a QoS guaranteed VoP IP network. The IP subnetwork address of the L2 switch card, the IP address included in the IP subnetwork address space allocated to the L2 switch card is fixedly assigned to each voice card, and the IP address is managed in association with the telephone number in the service controller. It characterized in that it comprises a controller to.

In addition, the routing / switch subsystem may include an IP subnetwork address including a plurality of IP addresses to configure, in a corresponding data card, an IP subnetwork terminating an IP network for a plurality of subscriber lines connected to the data card. A fixed allocation for each data card and L2 switch card that aggregates the corresponding data cards, and a controller for allocating and managing the IP subnetwork address used for the Internet and the IP subnetwork address used for the VoP IP network. Characterized in that.

In this case, the controller allocates individual IP addresses included in the IP subnetwork address space allocated to the data card to a plurality of subscribers connected to the data card, and the number of IP addresses included in the IP subnetwork address. Is less than the number of subscriber lines connected to the data card, it performs a function of a DHCP server to assign and release an IP address only when the subscriber's Internet terminal activates the connection. In assigning individual IP addresses included in an IP subnetwork address space allocated to a data card to a plurality of subscribers, wherein the number of IP addresses included in the IP subnetwork address is connected to the data card. More than the number of VoP IP The IP address included in the IP subnetwork address space and the IP address included in the IP subnetwork address space of the Internet are allocated and managed, and the IP address included in the IP subnetwork address space of the VoP IP network is a POTS service. It is characterized by managing in correspondence with the telephone number.

In addition, the above-described access gateway system for a multimedia service includes a number of VoIP sessions activated with other access gateway systems for each packet card connected to a VoP IP network to guarantee QoS for VoIP packets transmitted and received through the VoP IP network. If the number exceeds the number of active sessions set in the packet card, the call setup is rejected for the VoIP new call setup of the subscriber.

Furthermore, when the data card transmits / receives a plurality of bursted Internet packets of a PC through a link and a physical channel shared by the VoIP packet and the Internet packet, a VoIP session is established to ensure call quality of the VoIP voice packet. It performs a QoS management function to guarantee the bandwidth for the VoIP packet, characterized in that it comprises a controller for ensuring packet delivery by giving priority to the VoIP packet.

According to another aspect of the present invention, there is provided a QoS control network for guaranteeing communication quality and a body-generation communication network in which the Internet is physically or logically separated, comprising: at least one subscriber access means for connecting with a voice or data service subscriber; Switching means for switching a packet received from the subscriber access means; The present invention provides an access gateway system for a multimedia service including routing / forwarding means for routing / forwarding a packet switched by the switching means to a QoS guaranteed network or the Internet.

Here, the switching means is characterized in that the switching to switch according to the type of data received, characterized in that the data type is separated according to the QoS.

In another aspect of the present invention, there is provided a body-generation communication network in which a QoS-guaranteed network for guaranteeing communication quality and the Internet are physically or logically separated, the method comprising: receiving data from a voice or data service subscriber; Switching the packet according to the QoS type of the data after packetizing the received data; To provide a multimedia service method comprising the step of routing / forwarding the switched data packet to the QoS guaranteed network or the Internet.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The gateway system for a multimedia service according to the present invention is applied to a next-generation communication network as shown in FIG. 2, which is a VoIP voice service and an IP multimedia service and a voice and internet addition to a subscriber as shown in FIG. 4. Routing / switch that connects to service subsystem to provide service, VoP IP network and Internet, and is connected to service subsystem and Fast Ethernet link to perform routing and forwarding function of IP packets of individual cards. With a subsystem.

Here, the service subsystem includes a plurality of voice cards 50-1 to 50-n that accept subscriber lines for VoIP voice services, and a plurality of data cards 60-1 to 60 that accommodate Internet access for data services. -n) and a service control card 75 for controlling the VoIP voice service, the Internet multimedia service and the VoIP supplementary service.

Then, the routing / switch subsystem connects the L2 switch card 70 which aggregates and exchanges the high-speed Ethernet links of the individual cards belonging to the service subsystem, and transmits and receives VoIP packets by connecting a VoP IP network or accesses the Internet, which is the best network. Packet cards 80-1 and 80-2 for transmitting and receiving Internet IP datagrams, and routing control and switch module 90 for controlling the routing and switching functions for IP packets and exchanging data, At this time, the L2 switch card 70, the packet cards 80-1 and 80-2, and the routing control and switch module 90 interoperate with each other through an internal data and control bus which is a system bus.

In addition, the above-described access gateway for multimedia services has a number of VoIP sessions activated with other access gateways for each packet card 80-1 to 80-2 in order to guarantee QoS for VoIP packets transmitted and received through the VoP IP network. When the number of active sessions set in the packet card is exceeded, the function of rejecting call setup for the subscriber's VoIP new call setup is performed.

On the other hand, the above-described routing / switch subsystem is the IP address assigned to the sound cards 50-1 to 50-n, and the L2 switch card 70 condensing the sound cards 50-1 to 50-n. A controller (not shown) for assigning and managing an IP sub-network address, wherein the IP of the L2 switch card 70 condensing the voice cards 50-1 to 50-n is provided. The subnetwork address allocates the IP subnetwork address provided by the QoS-guaranteed VoP IP network, and is included in the IP subnetwork address space allocated to the L2 switch card 70 for the voice cards 50-1 to 50-n. The IP address is fixedly managed by each voice card 50-1 to 50-n, and the service controller manages the IP address in association with the phone number.

In addition, in the case of the IP address assigned to the data cards 60-1 to 60-n by the controller of the above-described routing / switch subsystem, for a plurality of subscriber lines connected to the data cards 60-1 to 60-n. An IP subnetwork address including a plurality of IP addresses is configured to configure one IP subnetwork that terminates the IP network in the corresponding data card 60-1 to 60-n. And fixedly manage each L2 switch card 70 converging these data cards 60-1 to 60-n, and IP subnetwork addresses fixedly assigned to each data card 60-1 to 60-n. It assigns IP subnetworks used in the Internet and IP subnetworks used in VoP IP network together.

At this time, the controller of the routing / switch subsystem is the IP subnetwork address assigned to the data cards 60-1 to 60-n corresponding to the plurality of subscribers connected to the data cards 60-1 to 60-n. Individual IP addresses included in the space are allocated. If the number of IP addresses included in the IP subnetwork address is less than the number of subscriber lines connected to the data cards 60-1 to 60-n, DHCP server assigns and releases an IP address only when the Internet terminal activates a connection. The number of IP addresses included in the IP subnetwork address is connected to the data card 60-1 to 60-n. If there is more than enough subscriber lines, each subscriber line will have an IP address included in the IP subnetwork address space of the VoP IP network and an IP address included in the IP subnetwork address space of the Internet. By administration but, in the case of the VoP IP address contained in the IP sub-network address space for the IP network is managed in association with the phone number for POTS service.

The internal configuration of each card and module of the above-described access gateway system will be described in more detail with reference to the accompanying drawings. Each voice card 50-1 to 50-n is a POTS terminal on the subscriber side connected by a 2-wire loop or DS0. Converts the analog voice or PCM voice signal into IP packet and transmits it to the called party through VoP IP network, which is a VoIP packet network, or conversely, the encoded voice received as IP packet through VoP IP network is converted into PCM voice signal or analog voice. A reverse conversion is performed to transmit to a POTS terminal of a subscriber. For this purpose, as illustrated in FIG. 5, a POTS line for accepting a plurality of analog subscribers through a POTS line and providing a Plain Old Telephony (POT) service is provided. A digital signal (DSP) for converting and inversely converting an audio signal into an encoded packet and removing echo from the interface unit 51 Processor 52 and the encoded voice packet received from DSP 52 are converted into IP packets of RTP / UDP / IP and transmitted to the Ethernet interface unit 54, or the IP received from the Ethernet interface unit 54. The controller 53 extracts the encoded voice packet from the packet, transfers it to the DSP 52, and controls the L53 switch card 70 through the fast Ethernet link by converting the IP packet received from the controller 53 into an Ethernet MAC packet. ), And extracts an IP packet from the Ethernet MAC packet received from the L2 switch card 70 and transmits the IP packet to the controller 53.

Each data card 60-1 to 60-n is connected to the subscriber's home xDSL / cable through a 2-wire loop POTS line or HFC (Hybrid Fiber Optic) line as shown in Figs. 6A and 6B. Data card for xDSL / cable modem which transmits high speed packet data to VoP IP network and Internet by interworking with modem and high speed packet data is transmitted to VoP IP network and Internet by interworking with Ethernet terminal of subscriber's house through Ethernet line. Can be divided into Ethernet data card.

Here, the xDSL / cable modem data card includes an xDSL / cable modem interface unit 61 which decrypts / encodes a modem signal received through the xDSL / cable modem at the subscriber side, as shown in FIG. The IP packet received from the xDSL / cable modem interface unit 61 is transferred to the Ethernet interface unit 63, or the IP packet received from the Ethernet interface unit 63 is transmitted to the individual subscriber modem of the xDSL / cable modem interface unit 61. Controller 62 for forwarding, distributing, and controlling the controller, and Ethernet MAC / IP packets received from the controller 62 to the L2 switch card 70 through the high-speed Ethernet link, or received from the L2 switch card 70. Ethernet interface 63 for delivering the Ethernet MAC / IP packet to the controller (62).

And, as shown in (b) of FIG. 6, the Ethernet data card includes an Ethernet interface and an L2 switch 64 for converging the Ethernet on the subscriber side and exchanging MAC packets, an Ethernet interface and an L2 switch 64, and the like. The controller 65 relays and controls the Ethernet MAC frame transmitted and received between the Ethernet interface unit 63, and transfers the Ethernet MAC frame received from the controller 65 to the L2 switch card 70 through a fast Ethernet link, Ethernet interface unit 63 for transmitting the Ethernet MAC frame received from the L2 switch card 70 to the controller (65).

Each L2 switch card 70 transfers Ethernet MAC frames of subscribers, which are individual cards, to the packet cards 80-1 and 80-2 connected to the VoP IP network or the Internet through a high-speed Ethernet link. As shown in FIG. 7, an Ethernet interface for converging Ethernet of a plurality of voice cards 50-1 to 50-n and data cards 60-1 to 60-n and exchanging Ethernet MAC frames; Extract the IP packet from the L2 switch 71 and the Ethernet MAC frame received from the Ethernet interface and the L2 switch 71 and forward the IP packet to the packet routing / forwarding engine 73 or received from the packet routing / forwarding engine 73. Controller 72, which packs the Ethernet MAC address of individual subscriber line, forwards, distributes and controls Ethernet interface and L2 switch 71, and controller 72 includes IP packet buffer and packet routing / forwarding table. in Forwards the received IP packet to the first packet card 80-1 connected to the VoP IP network through the internal system bus or to the second packet card 80-2 connected to the Internet based on the packet routing table. And a packet routing / forwarding engine 73 for forwarding the IP packets received from the corresponding packet cards 80-1 and 80-2 to the controller 72.

At this time, each packet card (80-1 ~ 80-2) is connected to the QoS-guaranteed VoP IP network or the Internet to transmit the VoIP packet and the Internet packet of the subscriber to the corresponding network, or the VoIP packet and the Internet packet received from the network. Routing / forwarding to the corresponding L2 switch card 70 according to the destination IP address, for this purpose, as shown in Figure 8 of the accompanying drawings according to the access technology of the link layer connected to the VoP IP network or the Internet L2 link interface 81 for transmitting and receiving IP packets by connecting a link such as Gigabit Ethernet (GbE) / High Speed Ethernet / POS (Packet Over SONET) / ATM, and received from the L2 link interface 81 A controller 82 which delivers IP packets to the packet routing / forwarding engine 83 or forwards and controls IP packets received from the packet routing / forwarding engine 83 to the L2 link interface unit 81; A packet buffer and a packet routing / forwarding table to route / forward IP packets received from the controller 82 to the corresponding L2 switch card 70 via an internal system bus based on the packet routing table, or to an L2 switch card ( A packet routing / forwarding engine 83 that forwards the IP packet received from 70 to the controller 82.

On the other hand, the routing control and switch module 90 performs packet routing signaling with a router of an IP network, and the packet routing / forwarding engine provided in the L2 switch card 70 and the packet cards 80-1 and 80-2. (73, 83), and manages and updates the packet routing / forwarding table, and also exchanges IP packets between the L2 switch card 70 and the packet cards 80-1, 80-2. It performs a switch function, where the switch has enough switching capacity so that all IP packets exchanged within the system are exchanged without delay or loss.

In such an access gateway system for multimedia services, a packet routing / forwarding engine for routing and forwarding IP packets of a voice card or data card of a service subsystem is connected to a service subsystem and a fast Ethernet link. Implemented only on the L2 switch card of the switch subsystem, and the L2 switch card converges the Fast Ethernet link connected to the voice card or the data card to separate the IP packets of the corresponding individual cards into the VoP IP network or the Internet for routing and forwarding processing. This ensures that the QoS is guaranteed by only transmitting VoIP packets to the VoP IP network, which is guaranteed for QoS, and only Internet packets, when the voice and data cards are not equipped with a packet routing / forwarding engine. Providing multimedia services It can be so.

The data link between the data cards 60-1 to 60-n in the above-described access gateway for multimedia services transmits / receives an IP packet for VoIP of an Internet telephone, and at the same time, a PC or a data terminal in a subscriber area can access the Internet. In this case, since the VoIP packet and the Internet packet share the same link and physical channel, and the controllers 62 and 65 of the data card 60-1 to 60-n simultaneously process the VoIP packet and the Internet packet, the burst in the PC When a large amount of Internet packets are transmitted and received, the controller 62 of the subscriber's Internet phone and the data card 60-1 to 60-n when a VoIP session is established as a method for guaranteeing the call quality of the VoIP voice packet. QoS management functions are performed to ensure bandwidth for VoIP packets between the network gateways 65 and 65 so that the VoIP packets are not delayed or lost. The controllers 62 and 65 of 0-1 to 60-n give priority to VoIP packets to ensure packet delivery, and ensure that burst best-in-class Internet packet traffic of subscriber premises PC does not affect VoIP packets.

In addition, the embodiment according to the present invention is not limited to the above, and various alternatives, modifications and changes can be made within the scope apparent to those skilled in the art in connection with the present invention, for example In a QoS network that guarantees communication quality, and in a physical generation network where the Internet is physically or logically separated, a plurality of subscriber access devices that connect to voice or data service subscribers, and switching packets that are received from the subscriber access devices. It is possible to implement an access gateway system for a multimedia service including a device and a routing / forwarding device for routing / forwarding a packet switched by the switching device to a QoS-guaranteed network or the Internet, wherein the switching means is a type of data received. Thus, switching separately according to the required QoS It will be able to implement.

In the next-generation communication network as described above, when data is received from a voice or data service subscriber, the packet is packetized and then switched according to the QoS type of the corresponding data, and the switched data packet is routed / forwarded to the QoS-guaranteed network or the Internet. By processing, it is possible to provide a multimedia service.

As described above, the present invention concentrates a packet routing / forwarding engine that performs routing and forwarding processing on IP packets to an L2 switch card, and individual cards such as voice cards or data cards of a service subsystem are inexpensive. By linking with an L2 switch card by link, even if the capacity of the routing / switch subsystem is changed to implement an access gateway system as IP packets from individual cards are aggregated on the L2 switch card and then associated with the packet routing / forwarding engine. The system's scalability and flexibility can be improved by allowing individual cards in the service subsystem and application software in the access gateway to be used as is.

In addition, the present invention can improve the possibility of proportional reduction in the implementation of the access gateway system by concentrating on the L2 switch card without providing a packet routing / forwarding engine for each voice card or data card constituting the access gateway system. The overall cost of implementation of the system can also be reduced.

Claims (15)

An access gateway system for a multimedia service, comprising: at least one voice card for IP packetization and transmission of subscriber voice in a next generation communication network; and at least one data card for providing Internet access to a subscriber side, A service control card for controlling the VoIP voice service and the Internet service; A service subsystem for connecting with a voice or data service subscriber and having said voice card, data card and service control card; And a routing / switch subsystem connected to a VoP IP network or the Internet to perform routing and forwarding functions for the IP packets of the individual cards. The method of claim 1, The routing / switch subsystem includes: a packet card for transmitting and receiving VoIP packets by connecting to a VoP IP network or transmitting and receiving Internet IP datagrams by connecting to the Internet; Aggregate Ethernet links of individual cards belonging to the service subsystem, IP packetize the Ethernet MAC frames of the individual cards, and route / forward to the packet card connected to the VoP IP network or the Internet, or forward the VoIP packet and the Internet IP packet to a destination. An L2 switch card for transferring the voice card or the data card corresponding to the IP address; An access gateway system for a multimedia service, comprising: a routing control and switch module for controlling routing and switching functions for IP packets and exchanging data. The method of claim 2, And the L2 switch card, the packet card, and the routing control and switch module interoperate with each other via an internal data and control bus which is a system bus. The method of claim 2, The L2 switch card comprises: an Ethernet interface and an L2 switch for converging the Ethernet of voice cards, data cards and service control cards belonging to a service subsystem and exchanging Ethernet MAC frames; An IP packet buffer and a packet routing / forwarding table are provided to forward the IP packet to a packet card connected to a VoP IP network or a packet card connected to the Internet through an internal system bus based on the packet routing table, and received from a corresponding packet card. A packet routing / forwarding processor for transmitting an IP packet; Extract the IP packet from the Ethernet MAC frame received from the Ethernet interface and the L2 switch and transfer the IP packet to the packet routing / forwarding processor, or wrap the Ethernet MAC address of an individual subscriber line in the IP packet received from the packet routing / forwarding processor. And a controller for transmitting, distributing, and controlling the Ethernet interface and the L2 switch. The method of claim 2, The packet card may include an L2 link interface unit for transmitting and receiving an IP packet by connecting a Gigabit Ethernet, Fast Ethernet, POS, and ATM link connected to a VoP IP network or the Internet; An IP packet buffer and a packet routing / forwarding table to route / forward IP packets to the L2 switch card via an internal system bus based on the packet routing table, or to deliver IP packets received from the L2 switch card. A forwarding processor; And a controller configured to transfer the IP packet received from the L2 link interface unit to the packet routing / forwarding unit, or to transfer and control the IP packet received from the packet routing / forwarding unit to the L2 link interface unit. Access gateway system for multimedia services. The method of claim 1, The routing / switch subsystem allocates and manages an IP address assigned to a voice card and an IP subnetwork address of an L2 switch card, and manages an IP subnetwork address provided by a QoS-guaranteed VoP IP network. A controller for assigning a network address, fixedly assigning and managing IP addresses included in the IP subnetwork address space allocated to the L2 switch card for each voice card, and managing the IP address in association with a telephone number in the service controller. Access gateway system for a multimedia service, characterized in that it comprises a. The method of claim 1, The routing / switch subsystem may include an IP subnetwork address including a plurality of IP addresses to configure, in a corresponding data card, an IP subnetwork terminating an IP network for a plurality of subscriber lines connected to the data card. It includes a controller that assigns and manages a data card and a corresponding L2 switch card that aggregates the corresponding data cards, but allocates and manages both an IP subnetwork address used for the Internet and an IP subnetwork address used for the VoP IP network. An access gateway system for a multimedia service. The method of claim 7, wherein The controller is configured to allocate individual IP addresses included in an IP subnetwork address space allocated to a data card to a plurality of subscribers connected to the data card, wherein the number of IP addresses included in the IP subnetwork address is the same. And accessing and releasing an IP address only when the subscriber's Internet terminal activates the connection when the number of subscriber lines connected to the data card is less than that. The method of claim 7, wherein The controller is configured to allocate individual IP addresses included in an IP subnetwork address space allocated to a data card to a plurality of subscribers connected to the data card, wherein the number of IP addresses included in the IP subnetwork address is the same. If there are more subscriber lines connected to the data card, the IP address included in the IP subnetwork address space of the VoP IP network and the IP address included in the IP subnetwork address space of the Internet are managed for each subscriber line. And the IP address included in the IP subnetwork address space of the VoP IP network in association with the POTS service telephone number. According to claim 1, In order to guarantee QoS for VoIP packets transmitted and received through the VoP IP network, the number of activated VoIP sessions and other access gateway systems for each packet card connected to the VoP IP network exceeds the number of active sessions set in the packet card. If it is, the access gateway system for a multimedia service, characterized in that for rejecting the call setup for the VoIP call establishment of the subscriber. According to claim 1, When the data card transmits / receives a plurality of bursted Internet packets of a PC through a link and a physical channel shared by the VoIP packet and the Internet packet, a VoIP session is established to guarantee the call quality of the VoIP voice packet. And a controller which performs a QoS management function to guarantee bandwidth for the network, and prioritizes the VoIP packet to ensure packet delivery. In a generation-generation network in which QoS guarantee network and the Internet are physically or logically separated to guarantee communication quality, At least one subscriber access means for connecting with a voice or data service subscriber; Switching means for switching a packet received from the subscriber access means; And routing / forwarding means for routing / forwarding a packet switched by the switching means to a QoS guaranteed network or the Internet. The method of claim 12, The switching means, the access gateway system for a multimedia service, characterized in that for switching according to the type of data received. The method of claim 13, The data type is separated according to QoS, the access gateway system for a multimedia service. In a generation-generation network in which QoS guarantee network and the Internet are physically or logically separated to guarantee communication quality, Receiving data from a voice or data service subscriber; Switching the packet according to the QoS type of the data after packetizing the received data; And routing / forwarding the switched data packet to a QoS guaranteed network or the Internet.