KR19980022175A - Service session establishment method in open communication network - Google Patents

Abstract

The present invention relates to a service session establishment method in an open communication network for establishing a call satisfying a multimedia service by introducing a service session concept when an open communication network is constructed by applying an open information network structure on a broadband ISDN.

In an open communication network, when a service session for establishing a service call is established, a physical connection for providing a service in the network should be established.

In order to establish a connection that satisfies the quality of service according to the multimedia service, the communication session function unit is requested without reservation of a network connection. In this case, when network resources are allocated according to the request of all service session functional units without consideration of network resources, service connection may be delayed or connection establishment may fail due to lack of resources. In addition, depending on the characteristics of multimedia and services, many problems may occur in multi-party communication and connection protocol connection. In order to solve this problem, in the distributed processing environment, separate service session resource management and network resource sharing objects are placed to maintain resource sharing, and then check the shared network resources of the service session and the connection management function in advance according to the service quality. In addition, the service connection of a fast and stable multimedia communication session is required by requesting a communication session. As a result, when the network resources are insufficient, the performance of the network can be improved by avoiding the rejection message processing for the quick service call setup and the frequent connection between objects due to the call setup, and can effectively cope with network resource management and operation.

Description

Method of Service Session Establishment in Open Networking Architecture

1 is a conceptual diagram of an open information network structure.

2 is a conceptual diagram of an access session service session and a communication session.

3 is a detailed functional configuration diagram of a service session function unit.

4 is a diagram illustrating a procedure for accessing computed objects according to service session settings.

5 is a configuration diagram of a service session function unit that satisfies a service quality.

6 is a network resource management and connection procedure for establishing a service session.

7 is a processing flowchart of network resource management.

8 is a decentralized network resource management configuration

* Explanation of symbols for main parts of the drawings

410: network operator area 420: service provider area

423: communication session function unit 431,432: user

455: User service session management function

460: session with the application service session management function

470: connection management function

The present invention relates to a service session establishment method in an open communication network, and more specifically, to provide various multimedia services in an open information network architecture (Open Infomation Networking Architecture) based on a broadband communication network (B-ISDN). In the case of interconnecting each other by the signaling method that introduces the concept of service session between service users, physical network connection between end service user terminals quickly and stably according to the quality of service required for multimedia service. The present invention relates to a network resource management and access procedure for accessing a service session that satisfies the function and quality of service.

In the prior art, the connection for the multimedia service is established based on the communication network applied depending on the environment of the service user using the application service according to the characteristics of the communication network. That is, before starting a new application service, the network connection was established between end users in the call setup process, and signaling was used to reserve the network connection in advance.

Such a signaling method is recognized in the network as allocating and using network resources in advance even when the service is not used when the network connection between users is not completely connected.

Therefore, when an emergency or a large number of service users request a service, network resources are preempted in the communication network in advance, and thus, services cannot be provided in a timely manner, and they cannot effectively cope with communication network operation and network resource allocation.

In addition, the network is recognized and operated as if it is using unused network resources, and due to the large number of information exchanges and managements between service call setup and connection, implementation difficulties and significant degradation of network system performance have occurred.

In this way, the service call and connection are integrated to separate the service call and the connection in the conventional signaling method that preempts and reserves the network connection while establishing the service call. It is possible to support various multimedia call settings by reducing and effectively using network resources.

Based on the separation principle of call and connection, TINA (Telecommunication Information Networking Architecture) consortium, which was formed by 1993 NTT, USA Belcore and UK BT, the world's leading telecommunication companies By establishing the concept of sessions, the international standardization is divided into the signaling method for service call establishment by dividing the signaling method for establishing a service call into an access session for connection with a network operator or service provider, a service session for providing a multimedia service, and a communication session for connecting actual network resources. Promoting.

In general, the multimedia service has a point-to-point quality of service such as delay, loss, and traffic control of data information according to different bandwidths and service provision depending on the user environment of the service. It requires a point-to-multipoint, multiplexing, or multi-Party connection rather than a point-to-point connection. In addition, a separate communication network and a connection protocol between terminals are required according to the mobility of the terminal, and a multicasting or broadcast type protocol must be supported in a one-to-many connection depending on the type of service.

In order to establish a connection for supporting the various service quality and access protocol required by the service, the conventional signaling method and the network structure have reached the limit of resources, and new open information for providing various multimedia services based on the next generation communication network. The TINA consortium proposed a communication network structure.

Open communication network basically establishes service session by object modeling, software development and object modeling that separate service call and connection, accommodate various service quality, and introduce object-oriented design technique.

In particular, the open communication network conceptualizes a communication network structure that performs the function of an object in a distributed processing environment without depending on the hardware of the network device (ATM switch, transmission device, etc.).

These open networks are driving strategies and possibilities for evolution into next generation networks without major changes to existing networks, and the world's leading network operators and vendors are technically verifying and testing.

Therefore, as a signaling method for providing a multimedia service in an open communication network based on a distributed processing environment, a network resource management and an access procedure that satisfies the service quality according to call establishment by a service session are required.

In an open communication network, service sessions provide similar functions as used in the conventional communication network for the call establishment function.

In other words, when a service session is established for call establishment according to the conventional method, a physical connection for providing a service should be established.

However, the service session requests a direct communication session function without reserving a connection to establish a connection that satisfies the service quality according to the service request. At this time, when allocating network resources according to the requirements of all service session function units in the communication session without considering network resources, service connection may be delayed or connection establishment may fail due to lack of network resources.

In addition, due to the inefficient management of network resources according to the multi-party connection, many problems may occur in multi-party communication and access protocols depending on the characteristics of multimedia services.

In order to solve this problem, a separate object is placed in the distributed processing environment to check the shared network resources of the service session and the connection management function in advance for a connection suitable for the quality of service, and then request a communication session for a fast and stable multimedia communication session. Service connection is required.

As a result, when network resources are insufficient, the performance of the network can be improved by effectively handling the rejection message for quick service call setup and frequent connection between objects due to call setup, and can effectively cope with network resource management and operation.

In accordance with the present invention, the present invention provides a multimedia service by sharing information with a network resource manager in advance for fast service call establishment based on a service session concept to provide a service quality in a communication network based on an open communication network. The purpose is to achieve rapid and effective network resource sharing according to call setup.

In order to achieve the above object, the present invention provides a service session between end-user service users, including an application service session management function in a service provider area and a connection management function in a network service provider area in an open information communication network based on a distributed processing environment. In the method of setting the method, if there is a request according to the service call setup, the first step of checking whether the network resource allocation request of the quality of service for the service call request is a new request, and if the new request, the application service session management function A second step of requesting resource allocation while increasing the number of retries (N) during the retry time (T) when network resource allocation is impossible outside the on-site service session information management function; and when the network resource allocation is possible, The connection management after receiving network resources according to the quality of service A third step of requesting a physical network connection to a communication session within a functional unit; a fourth step of waiting for the service call request after updating connection information of the service session and the communication session each time a connection is requested to the communication session; and, is not a new request by the check, the number of retry attempts (N) is, if fixed retries is less than the number of times (N _optimal) is performing a retry while continuously increasing a resource confirmation request number of times, and if exceeded, the service call By performing the fifth step of delivering the service unavailable message to the user requesting the service request, the service is provided by efficient resource sharing and use of the network according to the provision of a new multimedia service, and in the distributed processing environment, the frequent connection between objects is used to connect to the network. It can improve network performance by reducing overhead. It shall be.

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

1 is a conceptual diagram of an open information network structure.

The open communication network is divided into a service provider area 1000 that directly provides a multimedia service or a carrier area l000 that provides a service such as a network connection, and a user area 2000 that requests a service in the communication service area. .

The open communication network includes a distributed processing environment (distributed system) 300, an access session for service call processing, a service session, and a communication session management function on a high-speed transmission delivery network 200 composed of network components 100. It provides various multimedia application services such as video conferencing 500 and video-on-demand service 600 based on networking middleware 400 that performs network management functions.

As such, the open communication network is basically a software hierarchical structure independent of the hardware devices constituting the high-speed transmission delivery network 100, and is based on the networking middleware 400 that performs network management and service management functionally with the distributed processing environment 300. It is composed.

Therefore, such software is composed of a hierarchical structure supporting various multimedia services, and they are constructed based on the object-oriented design concept.

Based on the distributed processing environment, multimedia services are designed based on the object-oriented design concept, which has the advantage of software reuse and maintenance, network management and new service provision. In particular, functions such as call processing and connection performed in the networking middleware 400 are designed to be object-oriented so that all functions are performed in units of objects, and are advantageous for maintenance such as online.

FIG. 2 is a conceptual diagram illustrating the detailed functions of the networking middleware 400 of FIG. 1. In the network operator area 410 and the service provider area 420, an access session function unit 421 for multimedia service and call establishment is provided. ), The service session function unit 422, and the communication session function unit 423 are conceptual views.

When user-1431 requests an application service by connecting an application service to user-2432, user-1431 connects to the service provider 420 as an interface function between objects at a distributed processing environment level. Request an application service.

At this time, the service connection step 433, which is connected to the service provider 420 through the user and the communication network, is referred to as an access session connection.

The access session has functions such as service subscription, subscriber information management, and network access.It has information such as terminal environment, billing information, and subscriber service category of service subscriber according to service presser ID (Identification). Set the environment according to the user and the provided service according to the managed search service. When the access session is connected, the necessary application service provided by the network can be provided at any time.

If user-1 431, a service pressure man, wants an application service, a session of the application service is created. At this time, the service performing step 434 is performed, and it is necessary to grasp the address of the counterpart performing the application service session for establishing the service call and the environment of the counterpart terminal.

When the service session is established, a physical data channel (stream connection) between the counterpart 431 and the service requester 432, which is the target of the service, must be established. The functional unit responsible for making such a physical channel connection is the communication session function unit 423, and substantially connects the physical line in the connection management function unit.

Therefore, the communication session is tied to the connection management function that manages the service session and the physical network resource and maps the communication session and the physical network resource.

In practice, the communication session function unit 423 does not have a separate function except for mapping between the service session and the communication session without special management of network resources, and requests a physical connection to the connection management function unit 411 according to the requested multimedia service quality. do. In general, the connection management function is the network operator area 410, and the part for controlling and managing the session is considered as the service provider area 420. FIG.

The network and access and service connection establishment process is a server connection step 435, which is a physical connection between end-to-end service users. After the connection is performed, application services are performed between end users 431 and 432.

3 illustrates a detailed service session function unit 422 in the service provider area of FIG. 2.

The service session function unit (the reference numeral '450' is the same as '422') includes a user service session management function unit 455 and an application service session management function unit 458.

The application service session management function unit 458 performs overall control and management of the overall service session for call setup of the application service, the user service session management function unit 455 is configured according to the user using the service, the service Perform a user dependent function.

The application service session management function unit 458 includes a user service session management connection function unit 458a, an application service session access management function unit 458b, an application service session establishment / release control function unit 458c, and a communication session management connection function. Section 458d.

The user service session management function unit 455 includes an application service session management access unit 455a, a user access application service control function unit 455b, and a user access application service access management function unit 455c.

The application service session management function unit 458 and the user service session management function unit 455 form a connection 456 between computing objects through the session management connection function unit of each function unit.

In addition, if a call setup is made in the service session, it must be connected to the connection management function 411 for the physical network connection. At this time, a connection is established through the communication session management connection function unit 458d for the function connection between the service session and the communication session.

FIG. 4 is a diagram illustrating a procedure for accessing operation objects according to service session establishment for service call establishment in a general service session function unit.

Service user-1 and user-2 first access the service provider in an access session to receive the application service. In this case, users must first subscribe the application service to the service provider.

Users first use inter-object connection protocols and operations in distributed processing environments. When requesting the access session access message 1, the service provider sends an access session access permission message 2 to approve the connection between the service user and the service provider.

When the access session is connected, the user-1 requesting the service first requests the service session establishment for establishing the application service call to receive the application service with the user-2.

Accordingly, the service provider sends a message (4) that the service session is established to user-1 requesting the service, and creates an object group of the user service session management function unit-1 of the corresponding users in the service factory.

When the service session management function of the user-1 is generated, the user-1 may establish a service session at any time to receive an application service or to request a higher application service.

User-1 sends a message 5 requesting to receive User-2's application service to the service session management function via the user service session management function.

The service session manager requests an application service request message (6), which is requested by the user-1, and sends a message (7, 8) through the access session access function of the user-2 for a permission message capable of application service at the user-2. do.

When user-2 sends a message (9,10) to accept the participation in the application service, the call setup of the service session level for service provisioning is completed.

Therefore, a user service session management function unit for user-2 and user-2 for service session management is generated (11).

When such a service session establishment process is completed, a physical network connection establishment 12 for substantially providing an application service is requested to the communication session management function unit of the connection management unit.

As can be seen in Figure 4, in the conventional procedure for the physical network connection, if the service session is established in the service session management function directly with the other party without investigation or confirmation of the resources of the network, the connection management function to request the connection settings (12) Even if a service session is established in a state where network resources are insufficient or a configuration for connection between users is not established, a service cannot be provided because an actual physical connection is not established.

Also, the service setup time and connection delay time may be long to wait for a connection until a physical connection is established, or to find another connection path of a network. FIG. 5 is a view of a conventional service session function unit ('450' of FIG. 3), which avoids a method of requesting a physical connection through a direct communication session without considering network resources according to a service quality according to a user's multimedia service request. This is a service session management function configuration diagram for establishing a service call requesting a physical connection to a communication session function after checking a network resource capable of connecting a service for establishing a service call from a session to a communication session.

5 is a diagram illustrating a communication session resource management function unit 472, a communication session mapping function unit 474, and an application service session management function unit 460 of the connection management function unit 470 managing network resources of the connection management. An application service session setting / cancellation function unit 463, an application service session information management function unit 465, and a service session mapping function unit 466 are configured.

That is, in the application service session management function unit ('460' of FIG. 5) proposed in the present invention, the application service session information management function unit (465) is compared with the conventional application service session management function unit ('458' of FIG. 3). The service session mapping function 466 has been added, and the mapping information between network resources and sessions is shared between the communication session mapping function 474 of the connection management function 470 through an interface between objects in a distributed processing environment. Since the connection management function unit 470 must manage the network resource information of many network devices in the service provider area, a system (472, 473) for storing and managing separate data information is required. The disk 473 is stored and managed, and frequently used network information is managed by storing a session connection table in a separate resident memory.

The communication session mapping function unit 474 provides this information to the service mapping function while mapping network connection information of the communication session management function with the service session so that the physical connection requested by the service session can be provided on the network. .

The service session mapping function unit 466 uses the network information for determining whether a call establishment network resource is available according to the quality of service required by the user in the service session. Accordingly, the service session mapping function unit 466 has a function of confirming whether a network resource reservation function and resource allocation is possible for service call establishment, and is connected to the communication session mapping function unit 474 to share information with each other. Modify and change to have connection information.

Therefore, the conventional communication network, i.e., a method of allocating communication resources in advance, or checking the resource allocation of the network in advance, and requesting the communication session, the connection delay according to the network connection and the many control signals according to the network connection It has a more favorable condition than that which lowers the performance. The communication session mapping function of the service session mapping function unit is connected to the distributed processing system in different service provider environment areas by a contract, which is an object group unit connection procedure 475, and communicates at night allowed by the service provider. Supports establishing service sessions while sharing network resources for sessions.

6 is based on the concept of a service session in an open communication network. This is a connection procedure for establishing a service session by checking network resources when establishing a service call.

6 is basically the same as the access session of FIG. 4 until the access session. However, if User-2 accepts the provision of the application service (4), it creates the user service session management function-2 (5), and the service session before the service session management function requires a physical connection to the communication session function. Requests to the information management function whether to allocate network resources in a message (6),

When resource allocation is possible, resource allocation is possible immediately and sends a message (7, 8) to attempt a physical connection through the communication session function. However, if resource allocation is not possible due to lack of resources in the network, first, a message 11 is transmitted that the service call setup is difficult, and the service session management function starts the timer T 14 to retransmit several messages 12. Require resource allocation.

At this time, the timer value and the number N (10,12) of requesting retransmission are determined by the operator who operates the communication network later according to the performance of the network, the characteristics of the transmission network, and the service.

FIG. 7 is a flowchart illustrating a process for allocating network resources according to service call setup in an application service session management function unit (460 of FIG. 5).

If there is a request according to the service call setup, check whether the network resource allocation of service quality for the service call request is functioning.

In this case, as shown in the procedure of FIG. 6, since there is a case where resource allocation is impossible (10 in FIG. 6) and a case of reassignment (12 in FIG. 6), it is first checked whether the new resource allocation request (S3 in FIG. 7). do.

At this time, if a new request, resource allocation is possible (S4) immediately receives a network resource according to the requested quality of service (S6 in Figure 7, 6,7 in Figure 6), and requests a specific physical network connection to the communication session (8, 9 of FIG. 6, S7 of FIG. 7).

However, if resource allocation is impossible, N relocation may be requested, so N retries are performed for a reasonable time. At this time, the timer value T indicating the retry waiting time and the number of retries N are tuned according to the policy of the service provider of the network operator according to the performance of the network. However, the product of T and N should be less than 500ms to maintain normal network performance.

If the number of retries is less than N _optimal (S9), the retry is continuously performed. If the resource allocation is possible as a result of the retries, the communication session is immediately requested for a physical connection. In order to prevent inconsistency between the mapping table of the service session and the mapping table of the communication session, the contents are updated between the mapping tables each time a connection is requested in the communication session (S8 in FIG. 7).

However, if it exceeds the N _optimal number of retries (S9), the network resources are insufficient, so the user who requested the service call transmits a message (14, 15 of FIG. 6) indicating that the service is not available, and rejects the service call request. That is, after canceling the service session connection (S10), the service session connection information table is cleaned up (Sl1).

FIG. 8 shows that the information for network resource management uses a distributed processing environment rather than that of all systems in a specific region. Therefore, the characteristics of the network configuration apparatus (eg, outliers) 711 and the high-speed transmission network 713 are the same. The communication areas 715 and 716 are set by grouping according to the group. In the same area, it is advantageous to have a system management function 711 for managing resource collection of one system.

In the high-speed transmission network, each network component manages its own information while performing its own network resource management. However, a resource management system 711 of a representative communication session is provided for effective network resource management and monitoring in terms of distributed environment and network management.

FIG. 8 divides the network management system into regions according to regions and characteristics, and has one representative communication session and a network resource management system such as a physical network connection for each communication region, and is connected to a service session management system.

As described above, a distributed network resource management is needed to classify a communication network by classifying the location and characteristics of a specific network component device in a distributed processing environment, and to manage a plurality of network resources according to communication areas.

8 is a block diagram illustrating such distributed network resource management according to a communication area.

The present invention as described above has the following effects.

First, the present invention is a method of establishing a service call by applying a service session graph form of an open communication network, unlike a conventional service call setting method, and using a separate service session not defined in an open communication network structure in a distributed processing environment. By establishing a communication object with a communication session mapping function, the service session and the connection management function's shared network resources are checked after requesting for a communication session, so that a fast and stable multimedia service connection is possible.

As a result, when network resources are insufficient, the performance of the network can be improved by effectively avoiding frequent inter-object connections (operations) caused by call setup of reject message processing for quick service call setup, and can effectively cope with network resource management and operation.

Secondly, the present invention manages network resource management in the existing distributed processing environment as object information by using an open object distributed processing environment, and is easily portable to other distributed environments. It is simple to implement by using network resource management and can be used in various environments because it is easy to apply.

By applying this object-oriented design concept, information management of service and communication session for sharing network resources apart from service call setup is easily and quickly applied to connection service between different objects by operation connection between objects in distributed processing system environment. In addition, efficient and economical network resource management enables efficient network management and construction, which is expected to have high addedness.

Third, after establishing the service session as a method for improving the performance of the network, the number of connection retry attempts in case the communication session cannot be established due to insufficient network resources in the network resource allocation request N _optimal (FIG. 6). 10,12) and the retry latency T (14 of FIG. 6) can be set to extract the appropriate network tuning parameters according to the network configuration and application service characteristics to maximize network performance and to be efficient and resilient to the network. You can expect a way.

In addition, in a distributed processing environment, it is possible to construct a stable network by using network resource duplication and reconstruction by decentralizing and systemizing network resource information according to a service provider area and a service provider area.

Claims (4)

In the method of establishing a service session between service users in the terminal, including the application service session management function in the service provider area and the connection management function in the network service provider area in an open information communication network based on a distributed processing environment. A first step of confirming whether the network resource allocation request of the quality of service for the service call request is a new request when there is a request according to the setting, and the service session information management function in the application service session management function If network resource allocation is impossible, the second step of requesting resource allocation while increasing the number of retries (N) during the retry time (T); and if the network resource allocation is possible, network resources according to the service quality requested by the user. After receiving the assignment, physical network to the communication session in the connection management function A third step of requesting a connection and a fourth step of waiting for the service call request after updating the connection information of the service session and the communication session each time a connection is requested to the communication session, and if not a new request by the confirmation. If the number of retries (N) is less than the predetermined number of retries (N _optimal ), the number of resource check requests is continuously increased to perform retries. If the number of retries (N _optimal ) is exceeded, a service unavailable message is delivered to the user who requested the service call. A service session establishment method in an open communication network, comprising five steps, managing network resources. The method of claim 1, wherein the product of the retry time (T) and the retry frequency (N) is tuned to less than 500 ms to maintain normal network performance. 2. The method of claim 1, wherein the network share sharing check is performed by placing a separate service session and a calculation object of a communication session mapping function before the network connection request to the communication session. The method of claim 1, wherein the service session connection information is configured in a separate service session connection table and stored in a resident memory.