KR20040001235A - Method for proviging network service by class on Asynchronous Transfer Mode network - Google Patents

Abstract

The present invention relates to a class-specific Internet access service method according to the quality of service in an ATM network which diversifies the class of internet access services that can be provided to subscribers using a quality of service (QoS).

The present invention provides a first process of transmitting a service menu to a subscriber terminal when the subscriber terminal is connected in an ATM (asynchronous transfer mode) based network; When a particular service is selected from the service menu by the subscriber terminal, it is checked whether a QoS (Quality of Service) condition and a resource state corresponding to the selected service are satisfied. If the QoS and the resource state are satisfied, the service is accepted. And a second process of transmitting data by the service selected by the subscriber terminal.

The present invention configured as described above can cope with various QoS requirements when providing a multimedia service of the Internet, and can provide a high quality service according to a subscriber's request.

Description

Internet access service method according to quality of service in ATM network {Method for proviging network service by class on Asynchronous Transfer Mode network}

The present invention relates to an Internet access service method for each grade according to the quality of service in an ATM network. More specifically, the Internet access service grade that can be provided to a subscriber by using a quality of service (hereinafter, referred to as a quality of service) can be diversified. It is about how it can be.

Current Internet traffic is largely divided into elastic traffic and inelastic traffic.

The elastic traffic is traffic supported in a TCP / IP-based network, and is non-real-time traffic that is insensitive to delay, delay change, and change of interest rate like the Internet. This kind of traffic is loss sensitive and uses either Transmission Control Protocol (TCP) or User Datagram Protocol (UDP).

Inelastic traffic is real-time traffic that does not adapt well to datagram networks such as the Internet. This kind of traffic is sensitive to delay and varies in the amount of packet loss allowed.

The current Internet service is a best-effort service, and there is a limit in providing a real-time service, a connected service, and a delay-sensitive service. As a result, the Internet-based multimedia service such as voice and video has a high quality limitation.

In the process of deploying the network to the next generation network structure, the current service is regarded as a packet-based voice service.

Accordingly, the present invention has been made to solve the above-described conventional problems, and differentiates the Internet access service grade that can be provided to the subscriber by using a quality of service (QoS: Qulity of Service). It aims to be able to provide services.

1 is a block diagram of an ATM network to which a method for classifying Internet access service according to a service quality according to an embodiment of the present invention is applied.

2 is a signal flow diagram illustrating a method for accessing an Internet service according to a grade according to a quality of service in an ATM network according to an embodiment of the present invention.

3 is a flowchart for explaining the admission control procedure shown in FIG.

4 is a diagram illustrating a protocol structure for message transmission in an Internet access service device for each grade according to a quality of service in an ATM network according to an embodiment of the present invention.

According to an embodiment of the present invention for achieving the above object, a method of accessing Internet for each grade according to quality of service in an ATM network is provided.

Transmitting a service menu to the subscriber terminal when the subscriber terminal accesses the network in an asynchronous transfer mode (ATM);

When a particular service is selected from the service menu by the subscriber terminal, it is checked whether a QoS (Quality of Service) condition and a resource state corresponding to the selected service are satisfied. If the QoS and the resource state are satisfied, the service is accepted. And a second process of transmitting data by the service selected by the subscriber terminal.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail.

1 is a configuration diagram of an ATM network to which an Internet access service method for each grade according to a service quality according to an embodiment of the present invention is applied.

ATM network implemented by a plurality of routers (20, 30, 40) is divided into 53 bytes of cells or packets, ATM (dedicated-connection) switching technology for transmitting over a medium using a digital signal technology It is a network by asynchronous transfer mode. One cell is individually processed asynchronously with respect to the other cells and placed in a queue for multiplexing for circuit sharing.

The routers 20, 30, and 40 are represented by the ingress ATM node 20, the ATM switching node 30, and the output ATM mode 40 based on the subscriber terminal 10.

Here, the ingress ATM node 20 is a gateway router through which the subscriber terminal 10 enters the ATM network. The ingress ATM node 20 receives a service grade from the subscriber terminal 10 and performs a service according to the received service grade. A series of control is provided to provide a graded Internet access service according to the quality of service.

The input stage of the ingress ATM node 20 takes into account usage parameter control (UPC), admission control, usage-based charging, and the like. In the buffer of the ingress ATM node 20, queuing in a VC (Virtual Container), Consider priority queuing, weight-based cheating, and so on.

ATM switching node 30 is an element of the core network constituting the network, it is possible to over-congestion (congestion) in the node-to-node. In this case, the over-density control is a technique for determining whether to process and output the packet by an appropriate procedure when a packet is suddenly input to one node and to control the packet.

The egress ATM node 40 is a gateway router to which the subscriber terminal of the subscriber terminal 10 is connected.

Next, the Internet access service method for each grade according to the quality of service in the ATM network will be described in detail with reference to the signal flowchart shown in FIG. 2 and the flowchart shown in FIG. 3.

First, when a setup signal is transmitted from the calling party subscriber terminal 10 (S10), the ingress ATM node 29 transmits a setup confirmation signal to the calling party subscriber terminal 10 (S12), the calling party subscriber terminal 10 In step S14, the service menu is transmitted.

A screen for allowing a subscriber to select an Internet service type according to QoS is outputted to the calling party's terminal 10 receiving the service menu, and the subscriber selects a specific Internet service type and induces a service selection signal accordingly. If it transmits to the node 20 (S16), the acceptance procedure like the flowchart shown in FIG. 3 is performed.

Meanwhile, a best effort service with no QoS guaranteed through the service menu, a differential service with guaranteed QoS for the best service, and end-to-end bandwidth You will be able to choose one of these absolutely allocated guaranteed services.

Referring to FIG. 3, the input terminal of the ingress ATM node determines which service corresponds to the service selection signal (S100), and if it is a guaranteed service, the QoS of the current network satisfies the QoS condition that can provide the guaranteed service. It is determined whether or not (S102) and the resource state is satisfied (S104), and if the QoS condition is satisfied and the resource state is satisfied (Y in S102, Y in S104), the guaranteed service that absolutely allocates end-to-end bandwidth is accepted ( S102, S104). In this case, in order to provide guaranteed service, bandwidth must be absolutely allocated between end nodes.

On the contrary, if the QoS condition is not satisfied or the resource condition is not satisfied as a result of the determination in S102 and S104, the call is rejected.

On the other hand, if the service selected from the subscriber terminal 10 is a differential service as a result of the determination in S100, if the Expedited Forwarding (EF) QoS conditions and resource conditions are satisfied, the load control service, which is a differential service for transmitting data in the MPLS method, is accepted ( S106, 108). Here, EF (Expedited Forwarding) is a service that does not allow packet delay, and the parameters related to the appropriate QoS, that is, bandwidth, delay, delay jitter packet loss, etc. in the service. Becomes EF QoS.

For reference, the Multiprotocol Label Switching (MPLS) is a proven standard technique for speeding up and managing network traffic flow, and is involved in establishing a specific path for a given packet sequence, in which each packet has a label so that the router This saves you the time it takes to look at the address of the node that should forward the packet. MPLS works with IP, ATM, and Frame Relay network protocols, and, in relation to the OSI standard reference model of the network, allows most packets to be delivered at the switching 2 layer instead of the 3 layer (routing) traffic. In addition to speeding up the overall operation, it also facilitates network management for QoS.

On the other hand, if it is determined in S106 and S108 that the EF QoS or the resource status is not satisfied, the subscriber terminal 10 confirms the intention to connect, and if the subscriber terminal 10 wishes to connect (Y), S112 described later. If the subscriber terminal 10 does not wish to connect (N), the call is rejected.

Finally, if it is determined in S100 that the best service is selected by the subscriber terminal 10, it is determined whether there is a resource that can deliver current data (S112), and if the resource exists (Y), the best service is accepted.

When the acceptance of the load-controlled service or the best service according to the guaranteed service or the differential service is determined, the ingress ATM node 20 calls the subscriber terminal 50 through the ATM switching node 30 and the egress ATM node 40. Request processing (S20) (Please confirm that the description is correct.

Subsequently, when a connection acknowledgment signal is transmitted from the called party subscriber terminal 50 (S22) and the connection acknowledgment signal is transmitted to the ingress ATM node 20, the ingress ATM node 20 transmits it to the calling party subscriber terminal. And transmits the data from the calling party subscriber terminal 10 to the called party subscriber terminal 50 (S26).

When data transmission is completed and a disconnect signal is transmitted from the calling party subscriber terminal 50, the ingress ATM node 20 receives the called party subscriber terminal 50 through the ATM switching node 30 and the egress ATM node 40. Send the cutting signal to).

Thus, when the release signal transmitted from the called subscriber terminal 50 is transmitted to the ingress ATM node 20 through the egress ATM node 40 and the ATM switching node 30, the ingress ATM node 20 is released. The signal is transmitted to the calling party subscriber terminal 10 and the resources occupied are released.

Data transmission between the subscriber terminal 10 and the ingress ATM node 20 is performed at the ATM layer and the ATM layer, as shown in FIG.

The specific control signal (signal transmitted at each step in FIG. 2) is a CS-PDU (Convergence Sub layer-Protocol) by attaching header (HEADER) and trailer (TRAILER) information to AAL-SDU (service data unit) in AAL. Data Unit). After that, the CS-PDU becomes a SAR-PDU by attaching a segmentation and reassembly (SAR) header after data decomposition. The SAR-PDU consists of a header (HDR), a payload, and a trailer (TRLR). Subsequently, the ATM layer attaches a cell head (CELL HDR) to the ATM-SDU information to form an ATM-PDU, that is, a cell. This ATM cell is transmitted in units of bits.

According to the present invention as described above, when providing a multimedia service of the Internet can respond to a variety of QoS requirements, there is an effect that can provide a high-quality service in accordance with the needs of the subscriber.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

Claims (6)

Transmitting a service menu to the subscriber terminal when the subscriber terminal accesses the network in an asynchronous transfer mode (ATM); When a particular service is selected from the service menu by the subscriber terminal, it is checked whether a QoS (Quality of Service) condition and a resource state corresponding to the selected service are satisfied. If the QoS and the resource state are satisfied, the service is accepted. And a second process of performing data transmission by a service selected by the subscriber terminal. The method of claim 1, And a plurality of services classified according to QoS conditions as the service menu in the second process. The method of claim 2, The services classified according to the QoS conditions are guaranteed service, differential service, and best service. The method according to any one of claims 1 to 3, And if the service selected in the second process is a guaranteed service and fails to satisfy a QoS condition and a resource state corresponding to the guaranteed service, the call is rejected according to the quality of service in the ATM network. The method according to any one of claims 1 to 3, If the service selected in the second process is the differential service and the QoS condition and the resource situation corresponding to the differential service are not satisfied, the subscriber terminal checks whether the subscriber terminal desires to access and requests the access for the best service. Internet access service method according to the grade according to the quality of service in ATM network, characterized in that confirming acceptance. The method according to any one of claims 1 to 3, If the service selected in the second process is the best service, and satisfies the resource state corresponding to the best service, the call is connected, otherwise the call is disconnected. Way.