KR100462026B1 - Apparatus of proxy server and method of policy controling for mobile multimedia service - Google Patents

Abstract

A proxy server device for a mobile multimedia service according to the present invention is a proxy server device for interworking of a mobile communication network and a mobile multimedia subsystem for providing a multimedia service to a mobile terminal subscribed to the mobile communication network, wherein the mobile terminal is provided. A SIP protocol processing unit which receives a Session Initiation Protocol (SIP) message from the network; A SIP access processor for matching between the SIP protocol processor and an upper application layer; DNS connection processing unit for knowing the address of the location register having the location information of the mobile terminal; A policy control unit controlling a new QoS bearer setup with a mobile communication network according to a change of a quality of service (QoS) according to a service of the mobile multimedia subsystem; A call controller for call processing between the mobile terminals; And a subscriber information management unit for connecting the call control unit according to the path storage and call setup request according to the location registration of the mobile terminal.

According to the present invention, when the subscriber's location is frequently moved in the mobile multimedia service system, and the QoS of the mobile communication network is affected when the QoS changes due to the service, a proxy server having a policy control function for this configuration is used to configure the QoS. The change is expected to be reflected in connection with the mobile communication network.

Description

Apparatus of proxy server and method of policy controling for mobile multimedia service}

The present invention relates to a Session Initiation Protocol (SIP) server device for a mobile multimedia service in a mobile communication system, and more particularly, to transfer SIP processing to an IMS (IP Multimedia Subsystem) network between a mobile communication system and a mobile communication system. A proxy server apparatus and policy control method for a multimedia service.

In order to transfer the SIP protocol and data using the bearer of the mobile communication system so that the mobile terminal can use the services of the mobile multimedia system, a proxy server for a call processing end role in the mobile multimedia service system is required.

It handles the change of information in the IMS network according to the change of the location of the subscriber generated in the mobile communication system, or controls the reallocation of resources and the media flow according to the change of quality of service (QoS).

Conventionally, a subscriber having a PC for voice service or simple data communication in a wired internet network has accessed a SIP server through a wired internet network to receive voice service with an internet phone.

In relation to the above technology, Korean Patent Application No. 10-1999-0061618 (SIP protocol server device) proposed a SIP protocol server device for receiving various services of PSTN while using the Internet.

According to the above patent, the SIP server is composed of an Internet SIP client interface module, a PSTN interface module, a SIP message processing module, a SIP protocol module, a service logic unit, and a logging module for database management. It has a structure that can be applied to a variety of services in a non-structured structure, it is easy to add the service logic has the effect of facilitating expansion.

However, the above patent relates to a SIP server for providing a multimedia service in connection with a wired Internet network, and there is a problem in that a matter of reflection of a subscriber's location or a change of QoS is not reflected.

In order to solve the above problems, the present invention is a mobile multimedia service system for providing a mobile multimedia service in conjunction with a mobile communication network, the subscriber's location is frequently moved, affecting the QoS of the mobile communication network when the QoS changes depending on the service Proxy server for mobile multimedia service that configures a proxy server with policy control function for notification and reflection when giving a security policy to reflect QoS fluctuations generated in mobile multimedia subsystem in connection with mobile communication network. It is an object of the present invention to provide an apparatus and method.

1 is a diagram illustrating a network configuration of a mobile communication network and a mobile multimedia service system according to an exemplary embodiment of the present invention.

2 is a block diagram illustrating a functional structure of a proxy server for a mobile multimedia service according to an embodiment of the present invention.

3 is a call flow diagram for processing the policy control function of FIG. 2 according to an embodiment of the present invention.

4 is a detailed flowchart of the UMTS bearer setup of FIG. 3 according to an embodiment of the present invention.

<Brief description of the main parts of the drawings>

100: mobile multimedia subsystem 110, 160: proxy server

120, 150 serving server 130: HSS

140: query server 111: SIP protocol processing unit

112: SIP access processing unit 113: policy control unit

114: DNS access processing unit 115: proxy server call control unit

116: subscriber information management unit 200: mobile communication network

210: base station 220: SGSN

230: GGSN 300, 310: mobile terminal

A proxy server apparatus for a mobile multimedia service is a proxy server apparatus for interworking a mobile communication network with a mobile multimedia subsystem for providing a multimedia service to a mobile terminal subscribed to the mobile communication network. SIP protocol processing unit for receiving a Session Initiation Protocol) message; A SIP access processor for matching between the SIP protocol processor and an upper application layer; DNS connection processing unit for knowing the address of the location register having the location information of the mobile terminal; A policy control unit controlling a new QoS bearer setup with a mobile communication network according to a change of a quality of service (QoS) according to a service of the mobile multimedia subsystem; A call controller for call processing between the mobile terminals; And a subscriber information management unit for connecting the call control unit according to the path storage and call setup request according to the location registration of the mobile terminal.

Preferably, the SIP protocol processing unit is characterized in that the independent management according to the interface so that the application protocol is configured independently of the lower protocol.

Preferably, the policy control unit may control to transmit and receive a policy related message in association with the mobile communication network for QoS change or new bearer setup according to the service type of the mobile communication network.

In addition, the policy control method for a mobile multimedia service according to the present invention includes a calling party mobile terminal and a called party mobile terminal, a mobile communication network to which the calling party and the called mobile terminal are subscribed, and a calling party through the mobile communication network. In a mobile multimedia service system comprising an originating proxy server for providing an interface for a multimedia service of a mobile terminal, and a destination proxy server for providing an interface for a multimedia service of a called mobile terminal through the mobile communication network. A policy control method comprising: (a) transmitting a call connection request message from the calling party's mobile terminal to the called party's proxy server through the calling proxy server; (b) generating a token for performing a corresponding call connection in the called proxy receiving the call connection request message, and transmitting the call connection request message to the called mobile terminal; (c) the called mobile station generates a flow identifier for message division for the call, sends a session progress request message including the generated flow identifier to the called proxy server, and bears the bearer according to QoS resources of the call; Performing setup; (d) verifying, by the called proxy server, QoS resources according to media information of the call according to the session progress request message received from the called mobile terminal, and transmitting a session progress message to the calling proxy server; (e) The originating proxy server generates a token for performing a corresponding call connection according to the session progress message received from the called proxy server, verifies QoS resources, and then performs a session progress response message with the calling mobile terminal. Transmitting and performing bearer setup according to QoS resources of the call at the calling mobile station; And (f) performing bearer setup in the called mobile station and the calling mobile station and approving the QoS acceptance of the call to transmit and receive multimedia data with each other.

Preferably, in the step (d) or the step (e), the called proxy server or the calling proxy server is required for the session by using the media and bandwidth information and the end-point information for the call. And verifying the QoS resource.

Preferably, performing bearer setup in step (e) or step (f) may include the QoS information and the session included in the response message received by the calling party or the called mobile station according to the call setup request message transmission. Reallocating available QoS resources using QoS information included in a progress message and requesting verification of the reallocated QoS resources to the mobile communication network; The mobile communication network verifies the required QoS resource with reference to the subscriber profile of the mobile terminal and, if resource allocation is possible, a policy including the assignable QoS resource information, the token information, and flow identifier information to the proxy server. Sending a service connection request message; And re-verify the token information and the flow identifier information of the policy service connection request message received by the proxy server, transmit a QoS resource allocation determination message to the mobile communication network, and allocate the QoS resource to the mobile terminal in the mobile communication network. Delivering a decision message to complete the QoS resource allocation negotiation.

Preferably, the QoS acceptance acknowledgment of step (f) includes the proxy server sending a packet transfer request message informing the mobile communication network of the availability of QoS resources, and receiving a response.

In addition, the mobile multimedia service system according to the present invention is a mobile multimedia sub system for providing a multimedia service to a mobile terminal user subscriber subscribed to a mobile communication network, and is in charge of an interface between the mobile terminal and the mobile communication network. A proxy server including a policy control function according to resetting and changing of a quality of service (QoS); A home subscriber server (HSS) for storing and managing information of registered subscribers for receiving a multimedia service through the mobile communication network; A query server that interworks with the mobile communication network and performs a role of a firewall, inquires whether the destination subscriber is registered with the HSS, and retrieves location information; And a serving server that notifies the HSS of location registration or release information of the mobile terminal, downloads and stores a subscriber profile when registering location, and performs call control based on the stored subscriber information.

Preferably, the proxy server, SIP protocol processing unit for receiving a Session Initiation Protocol (SIP) message from the mobile terminal; A SIP access processor for matching between the SIP protocol processor and an upper application layer; DNS connection processing unit for knowing the address of the location register having the location information of the mobile terminal; A policy control unit controlling a new QoS bearer setup with a mobile communication network according to a change of a quality of service (QoS) according to a service of the mobile multimedia subsystem; A call controller for call processing between the mobile terminals; And a subscriber information management unit for connecting the call control unit according to the path storage and call setup request according to the location registration of the mobile terminal.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a diagram illustrating a network configuration of a mobile communication network and a mobile multimedia service system according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a mobile multimedia service system through an association with a mobile communication network includes a mobile multimedia sub system 100, a mobile communication network 200, and mobile terminals 1, 2 (300, subscribing to a mobile communication network 200). 310).

The mobile multimedia subsystem 100 includes proxy servers 1 and 2 (110 and 160), serving servers 1 and 2 (120 and 150), and home subscriber server (HSS) 130. And an interrogating server 140.

The proxy servers 1 and 2 110 and 160 serve as a substitute for a mobile multimedia service as a first connection point between the mobile communication network 200 and the mobile multimedia subsystem 200.

The serving servers 1 and 2 120 and 150 notify the HSS 130 at the time of registering or releasing the location, and downloading and storing the profile of the subscriber at the time of registering the location, based on the information of the subscriber. Take control.

In addition, the HSS 130 stores and manages subscriber information.

The mobile communication network 200 includes a 3GPP (3 ^rd Generation Partnership Project) as the web of the case (Universal Mobile Telecommunication System), UMTS according to standard mangil, base station 210 and, SGSN (Serving GPRS-General Packet Radio Service Support Node) ( 220 and a Gateway GPRS Support Node (GGSN) 230.

The base station 210 of the mobile communication network 200 serves to transmit to the radio signal and traffic network or data of the network to the terminal, SGSN 220 is a node that supports packet service, the base station 210 and the GGSN ( 230 serves as signaling and traffic forwarding.

In addition, the GGSN 230 serves as a gateway to the Internet.

In addition, mobile terminals 1 and 2 (300 and 310) should be equipped with a SIP protocol and an application program for mobile multimedia services.

In the mobile multimedia service system configured as described above, the proxy servers 1 and 2 (110 and 160) become initial connection points between the mobile communication network 100 and the mobile multimedia sub-system 200, and the mobile terminals 1 and 2 of the mobile subscribers. The passages (bearers) for 300 and 310 should be opened.

Therefore, a procedure of connecting a bearer in the mobile communication network 200 is preceded, and then a control message between the mobile stations 1 and 2 (300 and 310) and the proxy servers 1 and 2 (110 and 160) is transmitted and received.

The functional structure of the proxy server 1, 2 (110, 160) is as follows.

2 is a block diagram illustrating a functional structure of a proxy server 110 for a mobile multimedia service according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the proxy server 110 applied to the present invention includes a SIP protocol processor 111, a SIP connection processor 112, a policy controller 113, and a DNS (Domain Name Server) connection. And a processing unit 114, a proxy server call control unit 115, and a subscriber information management unit 116.

In the proxy server 110 having the above configuration, the SIP protocol processing unit 111 is a place for implementing a SIP protocol according to a standard standard, and the SIP access processing unit 112 connects a lower SIP protocol to a higher call control unit. Modulo upper application block implements upper call control irrespective of SIP protocol, and plays a role of connecting between upper application block and SIP.

The policy controller 113 sets a bearer with a new QoS in the mobile communication network 200 when the QoS needs to be changed and reflects it in the mobile multimedia network.

In addition, the DNS connection processing unit 114 is used to find the address of the location register, the proxy server call control unit 115 processes the general call processing such as input message processing and output message transmission according to the state.

When the subscriber's location registration is completed, the subscriber information manager 116 stores the path, and connects the corresponding call controller when the call setup request (INVITE) is received.

In the mobile multimedia network to which the proxy server 110 according to the embodiment of the present invention has the above configuration, the message flow between the policy controls in the proxy server 110 is as follows.

3 is a call flow diagram for processing the policy control function of FIG. 2 according to an embodiment of the present invention.

Referring to FIG. 3, in order to provide a mobile multimedia service, an originating mobile terminal 1 300, an originating proxy server 1160, and an originating proxy server 2 160 are provided through a mobile communication network 200. And, for the policy control between the mobile terminal 2 310 of the called party, the originating mobile terminal 1 300 first establishes a call to the proxy server 1 110 of the mobile multimedia subsystem 100 through the mobile communication network 200. The request message is transmitted (S301), and a response is received.

Proxy server 1 (110) receiving the call setup request message of mobile station 1 (110) forwards the call setup request message to proxy server 2 (160) at the called party (S302), and the destination proxy server 2 (160). Policy Control Function (PCF) 180 of) generates a token (S303).

At this time, since the called party's proxy server 2 160 has not yet received all the information on the called party, the proxy server 2 160 transmits the token generated without authenticating the media to the called mobile terminal 2 310 (see FIG. S304).

Then, the mobile station 2 310 of the called party responds to the call setup request message received from the proxy server 2 160 in step S304, generates a flow identifier (S305), and then proxy server 2 310 In step S306, a progress message is transmitted to the SIP session.

In this case, the flow identifier is used to distinguish the IP media flow related to the SIP session, and since the proxy server 2 310 having received the session progress message has information about media, bandwidth, and end point, it is required for the session. The QoS resource is verified (S307).

When the verification of the QoS resources is completed in the proxy server 2 310, a message for transmitting a session is transmitted to the proxy server 1 110 of the calling party, and the mobile terminal 2 310 of the called party sets up a UMTS bearer. Proceed to step (S316) and delivers an OK message to the proxy server 2 (160).

In addition, the proxy server 1 (110) of the calling party having received the session progress message of step S308 generates a token, verifies QoS resources (S309), and sends a session progress message to the mobile terminal 1 (300) of the calling party. Transfer (S310), the mobile terminal 1 (300) of the calling party also proceeds to the UMTS bearer setup (S311).

In addition, the PCF 180 of the proxy server 2 160 having received the OK message of step S316 approves acceptance of QoS (S317), and causes the mobile communication network 200 to open an IP bearer at the GGSN 230. .

Proxy server 2 (160) forwards the OK message to proxy server 1 (110) of the calling party (S312), and the PCF (170) of proxy server 1 (110) that received the OK message also grants QoS acceptance. After that (S313), the OK message is transmitted to the mobile terminal 1 (300) (S314).

The UMTS bearer setup in steps S311 and S316 and the QoS acceptance grant in steps S313 and S317 will be described in more detail as follows.

4 is a detailed flowchart of UMTS bearer setup and QoS acceptance of FIG. 3 according to an embodiment of the present invention.

Referring to FIG. 4, the UMTS bearer setup is performed in the same order in the calling party and the called party. Referring to the operation of the calling party, the mobile terminal 1 300 of the calling party first sets up a PDP for UMTS bearer setup. (Packet Data Protocol) The activation request message (Activate PDP Context) is transmitted to the SGSN 220 of the mobile communication network 200 (S401).

At this time, the mobile terminal 1 300 reassigns QoS resources based on the information received through the response and the information from the session progress message when the call is set up, and puts them in the PDP activation request message. To send.

Then, after verifying the required QoS resources and valid resources with reference to the subscriber profile, SGSN 220 transmits a PDP creation request message (Create PDP Context) to the GGSN 230 (S402) if resource allocation is possible. At this time, the PDP generation request message includes media authentication token information and information on a flow identifier.

In response to the received PDP generation request message, the GGSN 230 transmits a Common Open Policy Service (COPS): REQ (Request) message to the PCF 170 of the proxy server 1110 of the calling party (S403).

The PCF 170 verifies the media authentication token information and the flow identifier included in the received COPS: REQ message, and sends the result back to the SGSN 220 in a COPS: DEC (Decision) message (S404).

In response to the COPS: DEC message, the GGSN 230 transmits a COPS: RPT (Report) message, such as 'ACK' or "Error Response," to the PCF 170 (S405), and the SGSN 220 transmits the message. In step S402, a PDP creation response message (Create PDP Context Response) corresponding to the PDP creation request message is transmitted (S406).

In this case, the PDP generation response message includes QoS information for which the UMTS bearer setup negotiation is completed, and the GSGN 220 carries the negotiated QoS information and sends an PDP Activation Response message to the mobile terminal 1 (300). Transmit (S407) to complete the UMTS bearer setup.

Operation S401 to S407 described above is a UMTS bearer setup operation at the calling party, and steps S411 to S417 corresponding to UMTS bearer setup at the called party are also performed.

In addition, the operation on the QoS acceptance acknowledgment is a COPS: DEC message meaning that the PCF 170 of the originating proxy server 1110 notifies the GGSN 230 of the availability of QoS resources and sends a packet to be sent to the called party. In step S408, the GGSN 230 transmits a COPS: RPT message to the PCF 170 of the proxy server 1 110 in response (S409), thereby enabling multimedia data transmission and reception with the called party. do.

The called party can also transmit and receive multimedia data with the calling party in steps S418 and S419.

As described above, the proxy server apparatus and method for a mobile multimedia service according to the present invention controls a policy according to a service in a mobile multimedia sub-system and has a proxy server having an association with a mobile communication network so that the proxy server is moved. By separating the function between the communication network and the mobile multimedia network, it serves as an end of the mobile multimedia sub-system, so that it is easy to add service logic or expand network nodes in the mobile multimedia network. It is not extended to the server, and is processed in a proxy server, thereby minimizing the impact on mobile multimedia.

In addition, the configuration of the proxy server has the effect of enabling independent expansion according to node characteristics by implementing function separation such as query server or serving server.

Claims (9)

A proxy server device for interworking with a mobile terminal in a mobile multimedia subsystem for providing a multimedia service to a mobile terminal subscribed to a mobile communication network, A SIP protocol processing unit which receives a Session Initiation Protocol (SIP) message from the mobile terminal; A SIP access processor for matching between the SIP protocol processor and an upper application layer; DNS connection processing unit for knowing the address of the location register having the location information of the mobile terminal; A policy control unit controlling a new QoS bearer setup with a mobile communication network according to a change of a quality of service (QoS) according to a service of the mobile multimedia subsystem; A call controller for call processing between the mobile terminals; And Subscriber information management unit for connecting the call control unit according to the path storage and call setup request according to the location registration of the mobile terminal Proxy server device for a mobile multimedia service comprising a. The method of claim 1, The SIP protocol processor is a proxy server device for a mobile multimedia service, characterized in that the independent management according to the interface so that the application protocol is configured independently of the lower protocol. The method of claim 1, The policy control unit, Proxy server apparatus for mobile multimedia service, characterized in that for controlling the QoS change or the new bearer setup according to the service type of the mobile communication network to transmit and receive a policy related message. A calling party proxy server for providing a calling party mobile terminal and a called mobile terminal, a mobile communication network to which the calling party and the called mobile terminal are subscribed, and an interface for multimedia service of the calling mobile terminal through the mobile communication network; In the policy control method in a mobile multimedia service system comprising a destination proxy server for providing an interface for a multimedia service of a destination mobile terminal through the mobile communication network, (a) transmitting, by the calling mobile terminal, a call connection request message to the called proxy server through the calling proxy server; (b) generating a token for performing a corresponding call connection in the called proxy server that has received the call connection request message, and transmitting the call connection request message to the called mobile terminal; (c) the called mobile station generates a flow identifier for distinguishing a message for the call, and transmits a session progress request message including the generated flow identifier to the called proxy server, according to QoS resources of the call. Performing a bearer setup; (d) verifying, by the called proxy server, QoS resources according to media information of the call according to the session progress request message received from the called mobile terminal, and transmitting a session progress message to the calling proxy server; (e) The originating proxy server generates a token for performing a corresponding call connection according to the session progress message received from the called proxy server, verifies QoS resources, and then performs a session progress response message with the calling mobile terminal. Transmitting and performing bearer setup according to QoS resources of the call at the calling mobile station; And (f) performing bearer setup on the called mobile station and the calling mobile station and approving QoS of the call to transmit and receive multimedia data with each other; Policy control method for a mobile multimedia service comprising a. The method of claim 4, wherein In step (d) or step (e), the destination proxy server or the source proxy server uses the media and bandwidth information and the end-point information for the call to obtain the QoS resources required for the session. Policy control method for a mobile multimedia service, characterized in that verified. The method of claim 4, wherein Performing bearer setup in step (e) or step (f), The calling party or the called mobile station reallocates available QoS resources by using the QoS information included in the response message received in response to the call establishment request message and the QoS information included in the session progress message, and the mobile communication network. Requesting verification of the reallocated QoS resource; The mobile communication network verifies the required QoS resource with reference to the subscriber profile of the mobile terminal and, if resource allocation is possible, a policy including the assignable QoS resource information, the token information, and flow identifier information to the proxy server. Sending a service connection request message; And Re-verify the token information and flow identifier information of the policy service connection request message received by the proxy server, transmit a QoS resource allocation determination message to the mobile communication network, and determine the QoS resource allocation from the mobile communication network to the mobile terminal. Passing messages to complete negotiation of QoS resource allocation Policy control method for a mobile multimedia service comprising a. The method of claim 4, wherein QoS acceptance of the step (f), And transmitting, by the proxy server, a packet transmission request message for notifying the availability of QoS resources to the mobile communication network, and receiving a response. A mobile multimedia sub system for providing a multimedia service to a subscriber using a mobile terminal subscribed to a mobile communication network, A proxy server in charge of interfacing with the mobile terminal and a mobile communication network, the proxy server including a policy control function according to a reset and change of a quality of service (QoS) of a service; A home subscriber server (HSS) for storing and managing information of registered subscribers for receiving a multimedia service through the mobile communication network; A query server that interworks with the mobile communication network and performs a role of a firewall, inquires whether the destination subscriber is registered with the HSS, and retrieves location information; And A serving server that notifies the HSS of location registration or release information of the mobile terminal, downloads and stores a subscriber profile when registering a location, and performs call control based on the stored subscriber information. Mobile multimedia service system comprising a. The method of claim 8, The proxy server, A SIP protocol processing unit which receives a Session Initiation Protocol (SIP) message from the mobile terminal; A SIP access processor for matching between the SIP protocol processor and an upper application layer; DNS connection processing unit for knowing the address of the location register having the location information of the mobile terminal; A policy control unit controlling a new QoS bearer setup with a mobile communication network according to a change of a quality of service (QoS) according to a service of the mobile multimedia subsystem; A call controller for call processing between the mobile terminals; And Subscriber information management unit for connecting the call control unit according to the path storage and call setup request according to the location registration of the mobile terminal Mobile multimedia service system comprising a.