KR20070105810A - Method for providing service between heterogeneous networks - Google Patents

Abstract

A method for providing a service between heterogeneous networks is provided to provide the optimum service to a mobile station in a system connected between a portable Internet and an IMS network. The first message including an authority token is received to provide a service to a portable subscriber terminal in a communication system cooperating with heterogeneous networks. The authority token is authority information for bearer resources. A flow ID is created to distinguish at least one service flow based on session description protocol information of the portable subscriber terminal. The second message including the authority token and the flow ID is transmitted. The first message is an SIP 183 message.

Description

How to provide heterogeneous manganese services {METHOD FOR PROVIDING SERVICE BETWEEN HETEROGENEOUS NETWORKS}

1 is a diagram illustrating a system structure in which an IMS network and a portable Internet network are interoperable according to an embodiment of the present invention.

2 is a diagram illustrating a mapping relationship for providing QoS in a system in which an IMS network and a portable Internet network are interworking according to an embodiment of the present invention.

3 is a signal flow diagram illustrating a call connection procedure according to a first embodiment of the present invention.

4 is a signal flow diagram illustrating a call connection procedure according to a second embodiment of the present invention.

5 is a flowchart illustrating an operation process for receiving a service from a mobile station according to an embodiment of the present invention.

6 is a flowchart illustrating an operation process for providing a service by a base station according to an embodiment of the present invention.

7 is a diagram illustrating an operation of mapping a service flow identifier and a flow identifier by a base station according to an embodiment of the present invention;

The present invention relates to a service providing method between heterogeneous networks, and more particularly, to a method for providing a service when interworking with an IP (Internet Protocol) Multimedia Subsystem (hereinafter referred to as 'IMS') network and another network. .

IMS network is a system for providing an IP-based packet communication service. The IMS is based on a Session Initiation Protocol (hereinafter referred to as SIP), which is a text-based application layer control protocol. The SIP is based on a client / server architecture in which the server responds when clients initiate a call and has the ability to create, modify and terminate a session with one or more participants.

Therefore, the IMS network is expected to be a base network for providing VoIP (Voice over IP) services and multimedia services in wired and wireless converged networks. However, when interworking with the IMS network and other networks, a method for providing various services is not clearly defined.

The present invention was devised to solve the above problems, and an object of the present invention is to provide a method for providing a service when interworking with an IMS network and another network.

According to a first method of the present invention for achieving the above object, in a communication system interworking between heterogeneous networks, a method for receiving a service by a mobile subscriber station, the authority token being authority information for a bearer resource receiving a first message including a token, and referring to session description protocol (SDP) information of the portable subscriber station, a flow ID for identifying at least one service flow; Generating and transmitting a second message including the authorization token and the flow identifier.

A second method of the present invention for achieving the above object is a flow for identifying at least one service flow from a portable subscriber station in a method for providing a service by a base station in a communication system interworking between heterogeneous networks; Receiving a first message including an identifier (flow ID) and an authority token which is authority information in a bearer resource, and binding information including binding information combining the flow identifier and the authority token; 2) transmitting a message, generating a service flow identifier (SFID) logically corresponding to the flow identifier, and mapping the generated service flow identifier and the flow identifier.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation of the present invention will be described, and other background art will be omitted so as not to distract from the gist of the present invention.

The present invention proposes a method for providing a service between heterogeneous networks. Here, the heterogeneous network may be, for example, an IP (Internet Protocol) Multimedia Subsystem (hereinafter, referred to as “IMS”) network and a portable Internet network. Hereinafter, an embodiment of the present invention describes a service providing method when interworking between the IMS network and a portable Internet network. However, the present invention provides equal service between the IMS network and all networks that can be linked to the IMS network. Of course, it can be applied in a range.

1 is a diagram illustrating a system structure in which an IMS network and a portable Internet network interwork with each other according to an embodiment of the present invention.

Referring to FIG. 1, the system includes an IMS core network 100, an access control router 110 (ACR) 110, a radio access station (RAS) RAS 120, a Portable Subscriber Station (hereinafter referred to as Mobile Station) 130, a Correspondent Node (CN) 140, and a Policy Server 150. In addition, it may further include an authentication, authorization and accounting (AAA) server.

The IMS core network 100 may be configured as an IMS server, a home subscriber server (HSS), a multimedia content providing server, and the like, and a session initiation protocol (hereinafter referred to as SIP) with the mobile station 130. Has an interface.

The ACR 110 manages a user's connection and mobility, and provides an interface with the RAS 120 and the IMS core network 100. In addition, the ACR 110 exchanges functions related to the RAS 120 and the IP Convergence Sublayer (CS), and the interface with the IMS core network 100 is a COPS (Common Open Policy Server). You can use interfaces. The ACR 110 may use a Diameter interface with the AAA server (not shown). In addition, the ACR 110 performs a function of assigning a unique service flow for each service connection.

The RAS 120 is located between the ACR 110 and the mobile station 130 to provide a communication service to the mobile station 130, or medium access control (MAC) Quality of Service (hereinafter referred to as "the quality of service"). The scheduling is performed based on the information called 'QoS'.

The mobile station 130 may receive various services such as VoIP service, and supports the IEEE 802.16 standard.

The policy server 150 receives notification of call generation from the IMS server when the mobile station 130 establishes a call through SIP signaling. Then, the policy server 150 generates a flow ID and a corresponding QoS profile information of the session. The generated information is delivered to the ACR 110, and the ACR 110 applies QoS for each service flow based on the information.

2 is a diagram illustrating a mapping relationship for providing QoS in a system in which an IMS network and a portable Internet network are interworking according to an embodiment of the present invention.

Referring to FIG. 2, the system in which the IMS network and the portable Internet network are interworked includes a mobile Internet network 200, a portable Internet network composed of a BS 210, and an IMS network composed of an IMS server 220 and a policy server 230. It can be divided into Here, the BS 210 is defined as including RAS and ACR.

The mobile station 200, the BS 210, the IMS server 220 and the policy server 230 include hardware and / or software driven units for providing QoS. Maintain and manage QoS 201, 209, 211, 16 MAC QoS 203, 207, 215 and IP QoS 205, 213 profile information.

The respective QoS profile information is shown below.

Application QoS

Connection information

Media Format Information

Bandwidth information

IP QoS

Packet classification (5 tuples): source IP address, destination IP address, protocol, source port number, destination port number

QoS Service Class: Diiffserv Code Point (DSCP)

QoS data rate

-16 MAC QoS

Service flow scheduling type

Tolerated jitter

Maximum latency

Maximum sustained traffic rate

Maximum traffic burst

Maximum reserved traffic rate

Maximum tolerable traffic rate

3 is a signal flow diagram illustrating a call connection procedure according to a first embodiment of the present invention.

Referring to FIG. 3, mobile station 1 300 transmits a SIP_INVITE message to IMS server 330 to establish a call (eg, a VoIP call) connection to a destination terminal, that is, mobile station 2 340, as an originating terminal. (Step 301). In this case, the SIP_INVITE message includes Session Description Protocol (hereinafter referred to as SDP) information of the mobile station 1 (300). The SDP information is QoS information and bearer related information of the mobile station 1 (300).

The IMS server 330 sends the SIP_INVITE message to mobile station 2 340 (step 303). Mobile station 2 340 sends a SIP 183 message to IMS server 330 (step 305). The SIP 183 message includes SDP information of mobile station 2 (340).

The IMS server 330 transmits an authorization request message including SDP information, which is bearer information about the session, to the policy server 320 (step 307). The policy server 320 generates an authorization token and a flow identifier as an authorization identifier, and transmits an authorization response (ACK) message including the generated authorization token and the flow identifier to the IMS server 330. (Step 311). Here, the authorization token includes policy server information and QoS authorization information for managing the QoS profile of the session.

The IMS server 330 transmits the SIP 183 message including the authorization token to the mobile station 1 300 (step 313). The mobile station 1 300 generates a flow identifier (step 315), and receives the QoS information of the mobile station 1 300 in a dynamic service addition request (hereinafter referred to as DSA-REQ) message. The authority token is transmitted to the base station (BS) 310 (step 317). Here, the DSA-REQ message is a connection establishment request message for the session.

The base station 310 transmits a COPS-REQ message including binding information to the policy server 320 (step 319). Here, the binding information means information in which a right token and a flow identifier are combined.

The policy server 320 transmits a Common Open Policy Server-DECision (COPS-DEC) message to the base station 310. The COPS-DEC message may include information indicating whether a service connection is successful. Since the following procedures are not related to the gist of the present invention, the detailed description thereof will be omitted.

4 is a signal flow diagram illustrating a call connection procedure according to a second embodiment of the present invention.

Referring to FIG. 4, mobile station 1 400 transmits a SIP_INVITE message to IMS server 430 to establish a call (e.g., a VoIP call) connection to a destination terminal, that is, mobile station 2 440, as an originating terminal. (Step 401). In this case, the SIP_INVITE message includes SDP information of mobile station 1 (400). The SDP information is QoS information and bearer related information of the mobile station 1 (400).

The IMS server 430 sends the SIP_INVITE message to mobile station 2 440 (step 403). Mobile station 2 440 sends a SIP 183 message to IMS server 430 (step 405). The SIP 183 message includes SDP information of mobile station 2 (440).

The IMS server 430 transmits an authorization request message including SDP information, which is bearer information about the session, to the policy server 420 (step 407). The policy server 420 generates an authorization token and a flow identifier as an authorization identifier, and transmits an authorization response (ACK) message including the generated authorization token and the flow identifier to the IMS server 430 ( Step 411).

The IMS server 430 transmits the SIP 183 message including the authorization token to the mobile station 1 400 (step 413). The mobile station 1 400 generates a flow identifier for distinguishing flows for each media using its SDP information (step 415), and includes an authorization token received from the IMS server 430 and a generated flow identifier. The DSA-REQ message is transmitted (step 417).

The base station 410 transmits a COPS-REQ message including binding information combining the authorization token and the flow identifier to the policy server 420 (step 419). Thereafter, the base station 410 maps the flow identifier and a service flow identifier (SFID) (step 421). Here, the service flow identifier is generated by the base station 410, and the base station 410 logically maps the flow identifier and the service flow identifier. The flow identifier is used to distinguish flows for each media based on the SDP information, and the service flow identifier refers to an identifier of a one-way connection having a specific QoS.

Meanwhile, the flow identifier is flow information of an application layer, while the service flow identifier is flow information of a medium access control (MAC) layer. The reason why the base station maps the flow identifier and the service flow identifier in step 421 is that the flow identifier values in the DSA-REQ message received from the mobile station are the same regardless of the downlink and the uplink, but the service flow identifiers are the downlink and the uplink. It must have a value to distinguish it from. Therefore, the same flow identifier in uplink and downlink should be mapped to different service flow identifiers in uplink and downlink. Operation 421 will be described in more detail with reference to FIG. 7.

The mapped information is then binding information that can map service flow identification using QoS profile information provided from the policy server 420 using the flow identifier.

The policy server 420 transmits a COPS-DEC message including QoS information and classifier information to the base station 410 (step 423). The policy server 420 maps SDP information for the session to IP QoS information and includes the mapped information in the COPS-DEC message.

Upon receiving the COPS-DEC message, the base station 410 allocates a bearer resource for the corresponding session, maps the received IP QoS information to MAC QoS information, and compares the MAC QoS information requested by the mobile station 1 400. To determine the MAC QoS suitable for mobile station 1 (400). The base station 410 transmits the determined MAC QoS information to the mobile station 1 400 in a dynamic service addition response (hereinafter referred to as a DSA-RSP) message (step 427). .

The mobile station 1 400 transmits a DSA-ACK message to the base station 410 in response to the DSA-RSP message (step 427). The base station 410 transmits a COPSRPT message including information indicating that bearer resource allocation and MAC QoS determination is successful to the policy server 420 (step 429).

Thereafter, the mobile station 1 400 is connected to the mobile station 2 440 and the IMS network by a SIP message transmission / reception procedure (steps 423 to 437) between the mobile station 1 400, the IMS server 430, and the mobile station 2 440. The traffic exchange with QoS provided by the UE is enabled (step 439).

On the other hand, the mobile station generates the flow identifier for each media by using the SDP information. Table 1 below shows an example of allocating a flow identifier for each media (m) and uplink (UL) / downlink (DL) in a mobile station. In Table 1, RTP stands for Real Time Protocol, and RTCP stands for Real Time Control Protocol.

As mentioned above, the mobile station should include the flow identifier in the DSA-REQ message and transmit it to the base station. The base station can apply the QoS profile for each flow through the received flow identifier. Table 2 below is a table showing a DSA-REQ message format newly proposed in the present invention.

In the above description, the flow identifier generated by the mobile station is included in the DSA-REQ message and transmitted. However, the flow identifier can be generated by the policy server. Accordingly, the mobile station may receive the flow identifier generated by the policy server, and the mobile station may transmit the generated flow identifier to the base station by including it in the DSA-REQ message. In addition, even when the base station transmits the DSA-RSP message without receiving the DSA-REQ message of the mobile station, the base station may include the flow identifier.

5 is a flowchart illustrating an operation process for receiving a service by a mobile station according to an embodiment of the present invention.

Referring to FIG. 5, in step 502, the mobile station receives a SIP 183 message including authorization token information from an IMS server, and proceeds to step 504. The mobile station generates a flow identifier in step 504 and proceeds to step 506. In step 506, the mobile station requests a service to the base station by including an authorization token and a flow identifier in the DSA-REQ message.

6 is a flowchart illustrating an operation process for providing a service by a base station according to an embodiment of the present invention.

Referring to FIG. 6, in step 602, the base station receives a DSA-REQ message including an authorization token and a flow identifier from a mobile station, and proceeds to step 604. In step 604, the base station transmits a COPS-REQ message including binding information combining the authorization token and the flow identifier to the policy server, and proceeds to step 606. In step 606, the base station generates a service flow identifier and proceeds to step 608. In step 608, the base station maps a flow identifier and a service flow identifier.

7 is a diagram illustrating an operation of mapping a service flow identifier and a flow identifier by a base station according to an embodiment of the present invention.

Referring to FIG. 7, the packet classifier 704 of the base station detects an Internet Protocol (IP) header in a signal 702 received from the mobile station, and 5-tuple information 706 in the detected header information. Read out. Here, the 5-tuple information 706 shows a service flow identifier # 1 (UL audio) as an example. The 5-tuple information 706 includes a source IP address, a destination IP address, a source port number, a destination port number, and a protocol type.

The base station may obtain QoS information for uplink and / or downlink traffic using the read 5-tuple information 706 and other information. The base station maps the flow identifier and the newly generated service flow identifier according to the obtained QoS information. For example, SFID # 1 for UL audio has a mapping relationship with flow identifiers <1, 1> transmitted by the mobile station.

In the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

As described above, in the present invention, when the IMS network and another network are interworked, there is an advantage that the mobile station can be provided with an optimized quality of service. In particular, there is an advantage that the mobile station can be provided with an optimized quality of service in a system in which the mobile Internet network and the IMS network interwork.

Claims (12)

In a communication system interworking between heterogeneous networks, a method for a mobile subscriber station to receive a service, Receiving a first message in which a bearer resource includes an authority token, which is authority information, Generating a flow identifier (ID) for identifying at least one service flow by referring to session description protocol (SDP) information of the portable subscriber station; And receiving a service by transmitting a second message including the authorization token and the flow identifier. The method of claim 1, And the first message is a SIP 183 message. The method of claim 1, And the second message is a dynamic service addition request (DSA-REQ) message. The method of claim 1, And the second message is a dynamic service addition request (DSA-REQ) message. The method of claim 1, Receiving the service as a response message to the second message transmission, further comprising receiving a third message including associated quality of service (QoS) information; . The method of claim 5, And wherein the third message is a Dynamic Service Addition Response (DSA-RSP) message. The method of claim 1, The heterogeneous network includes an IP Multimedia Subsystem (IMS) network and a portable Internet network. The method of claim 1, The heterogeneous network includes an IP Multimedia Subsystem (IMS) network and a portable Internet network. In a communication system interworking between heterogeneous networks, the base station provides a service, Receiving a first message including a flow ID for identifying at least one service flow from a portable subscriber station and an authority token which is authority information in a bearer resource; Transmitting a second message including binding information combining the flow identifier and the authorization token; Generating a service flow identifier (SFID) logically corresponding to the flow identifier; And mapping the generated service flow identifier with the flow identifier. The method of claim 9, And the first message is a Dynamic Service Addition REQuest (DSA-REQ) message. The method of claim 9, And the second message is a common open policy service (COPS-REQ) message. The method of claim 9, The mapping of the service flow identifier and the flow identifier is used for distinguishing a quality of service (QoS) profile provided from a policy server.

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