KR20000033652A - Asynchronous gateway mode having a quality of service (QOS) mapping function and its control method - Google Patents

Abstract

PURPOSE: A device of an ATM(asynchronous transfer mode) gateway having a mapping function for QoS(quality of service) and its controlling method are provided to support to receive the QoS secured in a service to fit for itself through an optional subscriber of the service contacts the internet service using any kinds of communication networks and any kinds of terminals. CONSTITUTION: When mapping function is needed in an ATM gateway, a QoS is compared. A converting function needed at a real service is defined by performing the mapping operation of service quality parameter for mapping between parameters of service quality based on the ATM. A converting operation of service selecting ability for navigating contents belonged in the appropriate service is performed for a selecting operation of service requested from the service terminal. When a selection of program change to fit for an environment of the terminal is performed, a transferring/changing operation of routing information is performed to offer a conversion of service displaying method and a request of QoS between the appropriate terminal and a server. When the service mapping is not requested or a restoring signal about the selected internet service is received, a traffic speed interface function between the service terminal and the server is performed. The traffic to request the specific QoS is controlled to conform the appropriate QoS according to a control operation of traffic priority. When the restoration is finished in the server or the stopping signal of service is transmitted form the terminal, a media format change between the service terminal and the server is performed.

Description

Asynchronous gateway mode (ATM) gateway device having quality of service mapping function and control method thereof

The present invention enables uninterrupted provision between next-generation Internet services requiring various service qualities in a broadband information communication network (hereinafter referred to as B-ISDN) environment, and provides quality of service (QoS) between devices to ensure interoperability at the communication network and service level. The present invention relates to an asynchronous transmission mode (hereinafter referred to as ATM) gateway device and a control method that provides a mapping function, and to a standard ATM application service in a B-ISDN network environment in which heterogeneous service terminals and various types of servers are connected. The present invention relates to an ATM gateway device having a QoS mapping function that can be provided, and which allows a service user to receive various Internet services regardless of the type and processing capability of a terminal.

In general, broadband information network (B-ISDN) forms a wide area network infrastructure at the public network level based on ATM technology, and is connected to existing telephone network, data network, cable TV (CATV) network and local area network (LAN). And configured to interoperate.

Therefore, until the B-ISDN network is activated, it is necessary to use the existing service terminal and server to receive a new Internet service through the B-ISDN according to the quality level required and the level of cost that can be paid.

To do this, an ATM gateway device is needed to understand the type of Internet service, the terminal currently used, the ability of a server to provide a service, and the like to provide uninterrupted service between end-to-end services using an appropriate QoS mapping function. .

In this dimension, a transport layer level network interworking function that connects heterogeneous networks is needed first, and a gateway function of a transport level or higher that interconnects end users of the Internet service is essential.

According to these requirements, the standardization of interworking between heterogeneous communication networks has been mainly carried out for network interworking at the network level.

In other words, due to the explosive growth of Internet services and the development of multimedia next-generation Internet services with multi-service requirements, the application of existing end-to-end QoS guarantee mechanisms to B-ISDN networks is a limitation in many respects.

In particular, since heterogeneous networks or various terminals and servers have different QoS, QoS mapping function that converts the quality level according to the quality level required by each device or service is required to guarantee QoS between them.

Accordingly, an ATM gateway device having a QoS mapping function is required to provide uninterrupted provision of next-generation Internet services based on B-ISDN.

Looking at the related research / standard-setting activities of international standardization organizations, the International Telecommunication Union (ITU-T) is conducting standardization of network interworking with B-ISDN network, public telephone network (PSTN) and packet data exchange network (PSDN). , ATM Forum, Internet Engineering Task Force (IETF), Digital Audio Optical Conference (DAVIC), etc. are known as IP over ATM (Internet over IP) or data link level interworking. IPOA), circuit emulation, and local area network emulation (LAN Emulation).

Most of them are standardizing on network interworking from the point of view of communication networks.In recent years, standardization on integrated service structure and differential service structure based on Internet Engineering Task Force (IETF) has been provided. Is considering in earnest.

Until now, the QoS guarantee research has been mainly conducted at the network level, but recently, the research on the QoS guarantee at the service level and the apparatus providing the same have been actively conducted.

In view of the conventional requirements that the present invention cannot provide a multimedia next-generation Internet service having various QoS in a B-ISDN network-based high-speed information communication network environment by a simple network interworking as described above, It is an object of the present invention to implement a gateway device having a QoS mapping function and a control method thereof so that a subscriber can properly receive the QoS guaranteed by the service even if the subscriber accesses the Internet service using any communication network and any kind of terminal. .

1 is a schematic configuration diagram of a next generation internet network to which an ATM gateway device of the present invention is applied.

2 is a detailed configuration diagram of a next generation internet network to which an ATM gateway device according to the present invention is applied.

Figure 3 is a detailed block diagram showing the internal configuration of the ATM gateway device and terminal according to the present invention.

4 is a flowchart illustrating a QoS mapping process of an ATM gateway device according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: Next Generation Internet Network 11: ATM Switching Device

12: satellite communication network switching device 13: mobile communication network switching device

20: server 30: service terminal

31, 41: ATM network accessors 311, 411: IP-based API processing unit

312, 412: ATM network connector 32: network level connector

321: middleware function unit 33: service level connector

331: service browser function unit 40: ATM gateway device

42: network level mapper 421: routing conversion function

422 traffic processing mapping unit 423 priority control unit

424: QoS parameter mapping unit 43: application level mapper

431 media conversion unit 432 display method conversion unit

433: service selection conversion unit

In order to achieve the above object, an asynchronous transmission mode (ATM) network accessor for accessing the next generation Internet network;

A network level mapper for performing a protocol conversion function and an information compression method conversion function for service information and service control / management information received from the ATM network accessor and transmitting the same to the ATM network accessor;

An application level mapper that enables a service user and a service provider to receive and provide a service irrespective of a communication network and a service control / management protocol by using a quality of service (QoS) support and QoS information conversion function performed by the network level mapper. And providing a mapping function according to the QoS level required for each service connection.

In addition, in order to achieve the above object, a first step of determining whether a service mapping function is required at an ATM gateway receiving a service request from a service terminal, and performing the QoS capability comparison operation of the terminal if the mapping function is required. Wow;

A second step of defining a conversion function required for providing an actual service by performing a QoS parameter mapping operation for mapping between an IP-based QoS parameter of an Internet service and an ATM-based QoS parameter of a next-generation Internet network;

A third step of determining whether a mapping function for a desired service selection operation is required in the service terminal in this state, and performing a service selection capability conversion operation for navigating contents belonging to a corresponding service if a mapping function is required;

A fourth step of, if there is a program conversion selection to suit the environment of the terminal, converting the service display method and performing routing information transfer / transformation operation to provide QoS requirements between the terminal and the server;

When there is no service mapping request in the first step or when a reproduction signal for the selected Internet service is received, the traffic speed matching function between the service terminal and the server is performed, and traffic requiring a specific QoS is controlled according to the traffic priority control operation. A fifth step of controlling that the QoS is complied with;

And a sixth step of performing media format conversion between the service terminal and the server until the stop signal is transmitted from the terminal or the reproduction is completed in the server.

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

First of all, prior to describing the present invention, the quality of service (hereinafter referred to as QoS) referred to in the present invention will be described in brief. QoS is a quality of service that a user feels. Is very important for the successful proliferation of these

QoS parameters are defined for each communication layer (especially at the user terminal), which ultimately translates into network parameters that are meaningful to the network provider (Network Parameter: NP, eg Cell Loss Ratio in the case of ATM transport levels). Receive the desired level of service from the network.

At present, IP is a best-effort service and QoS is guaranteed.

Looking at the network configuration of the next generation Internet using the ATM gateway device implemented by the present invention as shown in Figure 1, the next generation Internet network 10 based on the B-ISDN network for the construction of the information communication path and;

A server 20 and a service terminal 30 connected to the next generation internet network 10 to receive or provide various Internet services provided by an ATM network;

ATM gateway device 40 for controlling the entire service interworking device, such as interworking method, location, communication between devices provided by the network is provided.

In practice, the QoS mapping function is required due to the difference in retention capability and request between the service devices through the ATM network.

In this case, for interconnection between service devices having different service characteristics, an ATM gateway device 40 that is located inside a communication network and provides a mapping function according to a QoS level required for each service connection is required.

ATM gateway device 40 having a QoS mapping function according to the present invention may be present in each of the locations shown in Figure 1, through which any Internet service can be provided through the next-generation Internet network (10).

FIG. 2 is a detailed block diagram illustrating a relationship between a location where an ATM gateway device having a QoS mapping function according to the present invention is mounted in a next generation Internet environment and related devices. The ATM gateway device of the present invention is located in an access network location of a B-ISDN network. There may be more than one network device.

An ATM switching device 11 for providing a B-ISDN network connection service to a service user as a network included in the next generation Internet network 10;

A satellite communication network switching device (12) for providing a satellite service to a service user;

A switching device (13) of a mobile communication network for providing a wireless service to a service user;

It is responsible for interconnection between heterogeneous Internet servers 20 and terminals 30 used by the ATM network and the service users so that service users can receive the services provided by the switching devices 11, 12, 13. A plurality of network interlockers 50;

Various heterogeneous internet servers 20 and terminals 30 connected to the network interlocker 50 to receive Internet services are provided.

3 is a block diagram showing a detailed configuration of an ATM gateway apparatus according to the present invention applied to a communication network as described above and a terminal receiving a service through the same, and is connected to a next-generation Internet network 314. )Wow;

After performing the service information received from the ATM network connector 41, a protocol conversion function for service control / management information, an information compression method conversion function, etc., the network level mapper 42 is transmitted to the ATM network connector 304 again. )Wow;

Application level that enables the service user and service provider to receive and provide services irrelevant to the communication network and service control / management protocol by using the QoS support and QoS information conversion function performed by the network level mapper 42. The mapper 43 is provided.

The ATM network connector 41 may include an ATM network connection unit 411 having an access protocol with a B-ISDN network;

An IP-based API processing unit 412 is provided to provide a standard access function according to the Internet protocol with the network level mapper 42, which is a higher level application and a higher level function of the gateway device.

The network level mapper (42) includes a routing converter (421) for providing proper routing in accordance with QoS;

A traffic processing mapping unit 422 for performing a traffic rate matching function suitable for each service characteristic;

A priority control unit 423 which processes the service in accordance with the characteristics of the service and the QoS level;

The QoS parameter mapping unit 424 is configured to process QoS parameters according to ATM network environments.

The application level mapper 43 provides a set of information related to service reception, such as the location of a server, a list of programs provided by the server, and a reception fee for each service, to the service terminals 30 requesting reception of a service through a new medium. A media conversion unit 431 for providing the service terminal 30 and performing a function required for QoS mapping, such as a function of profiling and managing information of the service terminal 30;

Functions of connecting to various servers 20 to receive the latest program information from the server, support the registration and program update of the server 20 to provide new services, and profile and manage the information of the server 20. A display method converting unit 432 in charge of the;

Identify differences in service receiving capabilities, service transmission / reception protocols, service control and management capabilities, operating system (OS), and window environment among servers 20 providing services to various service terminals 30. A service selection conversion unit 433 to grasp necessary conversion functions between the corresponding service terminal 30 and the server 20 requesting communication, and perform a QoS mapping function with the support of the network level mapper 303. do.

The service terminal 30 has an ATM network connector including an IP-based API processing unit 311 that provides a substantial communication function with another system, and an ATM network connection unit 312 for physical connection with the next-generation Internet network 10. (31);

A network level connector 32 having a middleware function unit 321 for providing communication between a communication protocol and a device, and providing functions necessary for end-to-end connection;

The service level connector 33 includes a service browser function unit 331 which provides an application service and processes a session for each service.

Referring to the flow chart of the ATM gateway device having a QoS mapping function of the present invention implemented as described above with reference to the flow chart of Figure 4, the ATM gateway device 40 receives a service request from the service terminal 30, It is determined whether a mapping function according to a service is required, and if a mapping function is required, the UE QoS capability comparison operation is first performed to examine the QoS capability of the UE (first step S1).

Subsequently, a QoS parameter mapping operation for mapping between the IP-based QoS parameter of the Internet service and the ATM-based QoS parameter of the next-generation Internet network is performed to define conversion functions required for actual service provision (step S2).

In this state, it is determined whether a mapping function is required in the service selection operation required by the service terminal 30, and if a mapping function is required, a service selection capability for navigating content belonging to the corresponding service. A conversion operation is performed (third step S3).

Subsequently, if there is a program conversion selection to suit the environment of the terminal 30, the service display method conversion and routing information transmission / transformation for routing the Internet service to provide QoS requirements between the terminal 30 and the server 20. Perform the action.

In this case, the service display method conversion is a function of selecting a service display method suitable for the Internet service among different navigation functions (S4).

Subsequently, when there is no request for mapping function in the first step S1 or when a playback signal for the selected Internet service is received, traffic overload due to a difference in traffic processing capability between the service terminal 30 and the server 20 is prevented. The traffic speed matching function is performed for the traffic, and the traffic requiring the specific QoS is controlled to comply with the QoS according to the traffic priority control operation (S5).

In addition, when the method of expressing the media between the service terminal 30 and the server 20 is different, the media format is converted through the data media conversion operation (S6).

The process executed in the sixth step continues while the service is being played, and when the play is finished in the server 20 or when a service stop signal is received from the terminal 30, the process returns to the initial standby state again and a new service is performed. Wait until there is a request (seventh step S7).

As described in detail above, when the ATM gateway device according to the present invention is used in an ATM-based high-speed information communication network, a next-generation Internet service is provided between an existing communication device and an ATM-based communication device and an existing service terminal and an ATM-based device. It has the advantage of being able to send and receive without interruption according to the quality of service demand, and can provide not only common network structure for accommodating newly developed multimedia type internet service in ATM network, but also required quality of service and terminal QoS gaps can be guaranteed or mapped and resolved to reduce the cost of service provision.

In addition, it is possible to support the difference in the QoS provision capability between the service terminal and the server through the ATM QoS parameter mapping function and the media conversion function, and to provide a service having better QoS to all service subscribers connected to the next generation Internet network.

Furthermore, it can provide a base that can accommodate various Internet providers based on ATM network.

In addition, a preferred embodiment of the present invention is disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the following claims You will have to look.

Claims (4)

An asynchronous transmission mode (ATM) network connector for accessing the next generation Internet network; A network level mapper for performing a protocol conversion function and an information compression method conversion function for service information and service control / management information received from the ATM network accessor and transmitting the same to the ATM network accessor; Application level mapping that enables the service user and service provider to receive and provide services irrespective of the communication network and service control / management protocol by using the quality of service (QoS) support and the service quality information conversion function performed by the network level mapper. And a mapping function according to a service quality level required for each service connection, wherein the asynchronous transmission mode (ATM) gateway device has a quality of service (QoS) mapping function. The method of claim 1, The network level mapper may include a routing converter configured to provide routing according to a service quality of each terminal; A traffic processing mapping unit for performing a traffic rate matching function suitable for each service characteristic; A priority control unit processing a service according to a service characteristic and a service quality grade; An asynchronous transmission mode (ATM) gateway device having a quality of service (QoS) mapping function, characterized in that it comprises a quality of service parameter mapping unit for processing the quality of service parameters to suit the ATM network environment. The method of claim 1, The application level mapper may include a media conversion unit configured to provide information related to service reception to service terminals requesting reception of a service through a new medium, and to profile and manage information of the service terminal; A display method converting unit connected to the various servers to receive program information from the server, support registration and update of a server to provide a new service, and profile and manage information of the server; A service that checks the environment and capabilities of servers providing services to various service terminals, grasps necessary conversion functions between the corresponding service terminal and the server requiring the communication, and performs a service quality mapping function in conjunction with the network level mapper. An asynchronous transmission mode (ATM) gateway device having a quality of service (QoS) mapping function, characterized in that it comprises a selection conversion unit. A first step of determining whether a service mapping function is required at an ATM gateway receiving a service request from a service terminal, and performing a service quality capability comparison operation of the terminal if a mapping function is required; A second step of defining a conversion function required for providing an actual service by performing a service quality parameter mapping operation for mapping between an IP based quality of service parameter of an Internet service and an ATM based quality of service parameter of a next generation Internet network; A third step of determining whether a mapping function for a desired service selection operation is required in the service terminal in this state, and performing a service selection capability conversion operation for navigating contents belonging to a corresponding service if a mapping function is required; A fourth step of, if there is a program conversion selection to suit the environment of the terminal, converting a service display method and performing routing information transfer / transformation operation to provide a service quality requirement between the terminal and the server; When there is no service mapping request in the first step or when a reproduction signal for the selected Internet service is received, the traffic speed matching function between the service terminal and the server is performed, and traffic requiring a specific quality of service is not included in the traffic priority control operation. A fifth step of controlling the service quality to be complied with; Asynchronous with a quality of service (QoS) mapping function, characterized in that the server comprises a sixth step of performing a media format conversion between the service terminal and the server when the reproduction is completed or the service interruption signal is transmitted from the terminal Transmission mode (ATM) gateway control method.