KR101064758B1 - Method and Apparatus for providing VoIP service guaranteeing Qos - Google Patents

Abstract

A call connection method and apparatus for providing a voice packet network service, comprising: receiving a call connection request including quality of service (QoS) information from an originating terminal; Confirming a network resource state for the call connection based on the received quality of service information; And determining whether to allow a call connection by the call connection request according to the resource state check result, and performing a call connection with a called terminal when the call connection is allowed. By using the call connection method to provide voice packet network service (QoS) guarantee, it is possible to provide high quality service of existing public switched telephone network (PSTN) level while using mobile VoIP service in broadband converged network. High quality voice service based on

Description

Method and Apparatus for Call Connection for Providing Voice Packet Network Service with Guarantee of Quality of Service {Method and Apparatus for providing VoIP service guaranteeing Qos}

The present invention relates to a voice packet network (VoIP) service, and more particularly to a call connection method and apparatus for providing a broadband voice packet network service.

Recently, the network is being formed through the Internet, and its use is also increasing. As a result, the telephone service provided through the existing public switched telephone network (PSTN) is being converted to Voice over Internet Protocol (VoIP).

VoIP is a communication service technology that converts voice data into Internet Protocol (IP) data packets to enable calls over a general telephone network. VoIP uses session protocols such as Session Initiation Protocol (SIP) to create, modify, and terminate sessions. SIP is designed to be used regardless of the type of session created, and can be used for session control of various types of multimedia services as well as Internet telephony.

IP Multimedia Subsystem (IMS) of the 3rd Generation Partnership Project (3GPP) is a structure that supplements the lack of to provide a SIP-based session control base to an operator network, and was basically developed to protect a session-based service of an operator. IMS works with network transport layer for easy delivery of IP multimedia services, and makes it easy to develop various application services. Especially, third-party service companies, not telecommunication service providers, also use open access structures to connect with IMS. It enables to develop interlocked services.

Resource and Admission Control Function (RACF) was defined by Working Group 3 (WG3), who is responsible for QoS standards in the ITU-T's Focus Group on Next Generation Network (GNFGN). It provides a function for resource management. It is located between the service stratum and the transport stratum, and performs quality management in the next generation network such as resource reservation, admission control, and service control. Provides QoS for That is, by considering the resource status of the transport network between the service control function and the transport function, the service layer needs to be specifically reflected in the next three networks, thus serving as a mediator for resource negotiation and allocation. Will be performed. RACF is not only defining the control structure of the network to support the quality guarantee service in the Internet-based transport network, but is also being developed to define the functions necessary to ensure the quality of session-based, such as voice telephony. .

The present invention is derived from this background, and aims to improve the quality of service (QoS) between networks in a broadband converged network in VoIP service.

The technical problem is a call connection method for providing a Voice over Internet Protocol (VoIP) service, comprising: receiving a call connection request including quality of service (QoS) information from an originating terminal; Confirming a network resource state for the call connection based on the received quality of service information; And determining whether to allow a call connection by the call connection request according to the resource state check result, and performing a call connection with a called terminal when the call connection is allowed. It is achieved by a call connection method for providing a voice packet network service that guarantees (QoS).

The checking of the network resource state may include: identifying, by a service controller, service quality information from the received call connection request; Transmitting, by the service controller, a network resource status check request to a network controller based on the grasped service quality information; And checking, by the network controller, whether or not resource reservation is possible for a call connection by the call connection request, and transmitting the request to the service controller.

The transmitting of the service control unit may include: transmitting, by the network control unit, a network resource status check request to a policy server of an access network to which the calling terminal and the called terminal belong according to the request; A policy server receiving the request, analyzing resource state information of each node and attempting to reserve a resource; Delivering, by the policy server, a result of whether a reservation is possible to the network controller; And transmitting, by the network controller, a result of availability of resource reservation received from the policy server to the service controller. Characterized in that it comprises a.

The method may further include determining whether a call is connected to the call connection request according to a result of the resource state check, and if it is determined that call connection is impossible, transmitting a call connection impossible message to the calling terminal. It is done.

On the other hand, the technical problem is a call connection device for providing a Voice over Internet Protocol (VoIP) service, Network connection for determining the network resource state based on the quality of service (QoS) information; And receiving a call connection request including quality of service (QoS) information from an originating terminal, requesting network resource state information on the quality of service (QoS) information from the network control unit, and receiving the network resource state information according to the received network resource state information. It is also achieved by a call connection device for providing a voice packet network service guaranteeing a quality of service (QoS) comprising a; a service control unit for performing a call connection by the call connection request.

The network controller may determine a network resource state according to availability of resource reservation in a policy server of an access network to which the calling terminal and the called terminal belong.

According to the present invention, when using a mobile voice packet network (VoIP) service in a broadband converged network, it is possible to provide a high-quality voice service based on the existing public switched telephone network (PSTN) level while providing a high-quality voice service based on IP. Can be.

Accordingly, it is possible to improve the profitability of the service provider and provide convenience to the service subscriber.

The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail so that those skilled in the art can easily understand and reproduce the present invention through these embodiments.

1 is a block diagram of a mobile VoIP service providing system according to an embodiment of the present invention.

As shown, the mobile VoIP service providing system according to an embodiment of the present invention includes a call connection device 100 including a service control unit 20 and a network control unit 30.

The originating terminal 10a and the terminating terminal 10b are multiband mobile communication terminals that can be connected to various radio access networks. For example, the calling terminal 10a and the called terminal 10b may be implemented as a mobile phone, a cellular phone, etc., and have a multimode / multiband function.

In this embodiment, the originating terminal 10a generates and transmits a SIP message including QoS information.

Session Initiation Protocol (SIP) is a protocol corresponding to H.323 of ITU-T and controls multimedia sessions or calls. SIP is a simple text-based application layer control protocol that is easy to implement and compatible with other services.

In this embodiment, the SIP message received from the originating terminal 10a is a SIP INVITE message, which includes a Session Description Protocol (SDP) containing network QoS information.

The service controller 20 is configured to process a call signal of a user and includes a call session control function (CSCF) server. The CSCF handles subscriber registration, authentication, billing, service-specific triggering and routing to the application server, caller location lookup, compression and decompression of SIP messages, and performs user session setup, adjustment, and management. It is linked with HSS (Home Subscriber Server) which stores subscriber profile information, authentication and location related data. It is an infrastructure system that performs basic functions for SIP-based multimedia session control and can be divided into P-CSCF (Proxy-CSCF), I-CSCF (Interrogating-CSCF), and S-CSCF (Serving-CSCF). .

The P-CSCF is the first point of access point to the user terminal in the IMS network, and serves as a proxy between the user terminal and the I-CSCF during SIP registration. In addition, the SIP call setup serves as a proxy between the terminal and the S-CSCF, and performs security management (IPSec of the UNI section) between the P-CSCF and each user terminal.

The I-CSCF is the first point point of one provider network, where the called terminal finds the registered S-CSCF or finds the originating S-CSCF of the user who roams into the service area of the current provider network. In addition, it performs a Topology Hiding Inter-network Gateway (THIG) function to prevent exposure of configuration, capacity, and topology information of the operator's network to the outside. In this embodiment, the I-CSCF grasps the network to which the called terminal 10b belongs from the interworking HSS, and transmits a SIP message including a call connection request to the registered S-CSCF.

The S-CSCF registers that the server controls the session of the user terminal in the home subscriber server (HSS), and acquires and stores subscriber information of the user terminal. In addition, session control and state management are performed for the registered UE. In addition, session control and state management are performed for the registered UE. In the present embodiment, the S-CSCF grasps the information of the called terminal 10b based on the received SIP message, and selects the P-CSCF in the network, including the SIP message including the call connection request received from the calling terminal 10a. Via the transmission to the destination terminal 10b.

The network controller 30 allocates and releases network resources for the call according to the QoS information received from the service controller 20. In the present embodiment, the network controller 30 reserves network resources by transmitting a resource allocation message according to a policy to the policy servers 40a and 40b existing on the path of voice traffic based on the QoS setting information.

2 is a flowchart illustrating a call connection method for providing a voice packet network service that guarantees quality of service (QoS) according to an embodiment of the present invention.

First, the originating terminal collects QoS information when there is a call connection request. The originating terminal transmits a SIP message including QoS information to the service controller based on the collected information.

Therefore, if a call connection request including QoS information is received from the originating terminal (S200), the service controller analyzes the SDP included in the SIP message and extracts QoS information therefrom (S210). In this case, the service controller extracts, analyzes, and stores only a portion of the SDP protocol of the body part of the SIP message including the network QoS related parameter. The extracted QoS information is transmitted to the network controller.

Thereafter, the network controller checks the network resource state based on the extracted QoS information (S220). Then, the access network to which the originating terminal and the called terminal to the call connection request belong, and the resource status in the core network is identified to determine whether to accept or reject the resource (S230).

If the resource state is allowed, the service control unit performs a call connection process by transferring a call connection request to the called terminal (S240). On the other hand, if the resource state is not allowed, the service control unit notifies that the call connection to the call connection request is impossible to the calling terminal (S245).

Hereinafter, a call connection method according to an embodiment of the present invention will be described in more detail with reference to FIGS. 3 and 4.

3 is a data flow diagram between components of a call connection method according to an embodiment of the present invention.

First, the calling terminal 10a transmits a call connection request to the service control unit 20 (S300). At this time, the call connection request is a SIP INVITE message including QoS information. Then, the service control unit 20 analyzes the SDP parameters in the SIP INVITE message, and extracts the QoS parameters (S310).

After that, the service control unit 20 transmits the extracted QoS information to the network control unit 30 (S315). QoS information is transmitted using the DIAMETER protocol. The DIAMETER protocol is peer-based to provide extensions for emerging policy and authentication (AAA: Authentication, Authorization, Accounting) services such as Point-to-Point Protocol (PPP), Roaming, and Mobile IP. It is a lightweight authentication protocol.

Then, the network controller 30 requests network resource reservation of each node to the policy servers 40a and 40b in the access network to which the core network, the originating terminal 10a and the terminating terminal 10b belong (S320a, S320b). ). The policy server 40a or 40b collects and analyzes the status of resources (S330a and S330b) and reports the reservation or acceptance result to the network controller 30 (S340a and S340b). At this time, the policy servers 40a and 40b use a common open policy service (COPS) and its model, COPS-PR (Policy Provisioning), to transmit a policy. COPS-PR provides a mechanism that can be effectively utilized in many network management areas.

Thereafter, the network controller 30 determines whether the resource state is a good state to perform the call connection according to the analysis result report received from the policy servers 40a and 40b. When it is determined that the resource state is good, the network controller 30 transmits a resource acceptance response to the service controller 20 (S350).

After receiving the resource acceptance response from the network control unit 30, the service control unit 20 transmits a call connection request from the originating terminal 10a to the called terminal 10b (S360). The call connection request delivered to the called terminal 10b is a SIP INVITE message. In addition, the called terminal 10b transmits a 200 OK message to the calling terminal 10a through the service control unit 20 (S375) in response to the call connection request (S375).

After that, the calling terminal 10a transmits an ACK message to the called terminal 10b in response thereto, and the called terminal receives the ACK message, thereby performing a call connection between the calling terminal 10a and the called terminal 10b. A session for connecting is connected (S380).

4 is a data flow diagram between components when a call connection by a call connection request is not allowed according to an embodiment of the present invention.

As described above, first, the calling terminal 10a transmits a call connection request to the service control unit 20 (S400). At this time, the call connection request is a SIP INVITE message including QoS information. Then, the service control unit 20 analyzes the SDP parameters in the SIP INVITE message, and extracts the QoS parameters (S410).

After that, the service control unit 20 transmits the extracted QoS information to the network control unit 30 (S415). QoS information is transmitted using the DIAMETER protocol.

Then, the network controller 30 requests network resource reservation of each node to the policy servers 40a and 40b in the access network to which the core network, the originating terminal 10a and the terminating terminal 10b belong (S420a, S420b). ). The policy server 40a or 40b collects and analyzes the status of resources (S430a and S430a) and reports the reservation or acceptance result to the network controller 30 (S440a and S440b).

Thereafter, the network controller 30 determines whether the resource state is in a good state to perform the call connection according to the analysis result report received from the policy server 40a or 40b.

If it is determined that the result is not good, the resource rejection response is transmitted to the service controller 20 (S450). At this time, the resource rejection response is transmitted when the policy server 40a or 40b fails to perform resource reservation for performing the call connection.

Then, the service control unit 20 transmits a connection impossible Reject message to the calling terminal 10a (S460), and additionally, the calling terminal 10a transmits a response thereto to the service control unit 20 (S465). . Accordingly, a session for call connection between the calling terminal 10a and the called terminal is not established. Accordingly, prior to any processing for attempting to connect a call with the called terminal, resource information is first identified, and whether or not a call connection is attempted, so as not to try to connect the call, it is possible to prevent waste of resources.

Meanwhile, the aforementioned call connection method can be created by a computer program. The program may also be embodied by being stored in a computer readable media and being read and executed by a computer. The storage medium includes a magnetic recording medium, an optical recording medium and the like.

So far I looked at the preferred embodiments of the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is shown in the claims, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

1 is a block diagram of a mobile VoIP service providing system according to an embodiment of the present invention

2 is a flowchart illustrating a call connection method for providing a voice packet network service that guarantees quality of service (QoS) according to an embodiment of the present invention;

3 is a data flow diagram between components of a call connection method according to an embodiment of the present invention;

4 is a data flow diagram between components when a call connection by a call connection request is not allowed according to an embodiment of the present invention.

Claims (10)

In a call connection method for providing a Voice over Internet Protocol (VoIP) service, Receiving a call connection request including quality of service (QoS) information from an originating terminal; Confirming a network resource state for the call connection based on the received quality of service information; And Determining whether to allow a call connection by the call connection request according to the network resource state check result, and performing a call connection with a called terminal when the call connection is permitted. Call connection method for providing voice packet network service with guaranteed (QoS). The method of claim 1, wherein the checking of the network resource status comprises: Grasping, by a service controller, service quality information from the received call connection request; Transmitting, by the service controller, a network resource status check request to a network controller based on the grasped service quality information; And Checking, by the network controller, whether or not resource reservation is possible for a call connection by the call connection request, and transmitting the same to the service controller; Call connection method for providing a voice packet network service to ensure a quality of service (QoS) comprising a. The method of claim 2, wherein the transferring to the service controller comprises: Transmitting, by the network controller, a network resource status check request to a policy server of an access network to which the calling terminal and the called terminal belong according to the request; A policy server receiving the request, analyzing resource state information of each node and attempting to reserve a resource; Delivering, by the policy server, a result of whether a reservation is possible to the network controller; And Transmitting, by the network controller, a result of availability of resource reservation received from the policy server to the service controller; Call connection method for providing a voice packet network service to ensure a quality of service (QoS) comprising a. The method of claim 1, Determining whether a call is connected to the call connection request according to a result of the resource state check, and if it is determined that call connection is impossible, transmitting a call connection impossible message to the calling terminal. Call connection method to provide voice packet network service guaranteeing quality of service (QoS). The method of claim 1, The call connection request is a call connection method for providing a voice packet network service guaranteeing a quality of service (QoS), characterized in that the SIP INVITE message, including the Session Description Protocol (SDP) containing network quality of service (QoS) information. . A call connection device for providing a voice packet network (VoIP: Voice over Internet Protocol) service, A network controller configured to determine a network resource state based on quality of service (QoS) information; And Receives a call connection request including quality of service (QoS) information from the calling terminal, requests network resource state information on the quality of service (QoS) information to the network control unit, and network resource state information received from the network control unit. And a service control unit for performing a call connection according to the call connection request according to the call connection apparatus for providing a voice packet network service. The method of claim 6, The network controller determines a network resource state according to availability of resource reservation in a policy server of an access network to which the originating terminal and the called terminal belong. Call for providing a voice packet network service guaranteeing quality of service (QoS) Connecting device. The method of claim 7, wherein The policy server analyzes the resource state information of each node using a COPS-PR protocol and reserves resources. Call connection apparatus for providing a voice packet network service guaranteeing quality of service (QoS). The method of claim 6, And the service control unit exchanges quality of service (QoS) related information with the network control unit using a DIAMETER protocol. The method of claim 6, If it is determined that the call connection is impossible according to the network resource state information, the service controller transmits a call connection impossible message to the calling terminal, and provides a call packet service for guaranteeing quality of service (QoS). Connecting device.

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