KR101070696B1 - Method for updating presence service information on heterogeneous network by presence network agent - Google Patents

Abstract

The present invention relates to a method for supporting a presence service in a wireless communication terminal. When the mobile station performs the handoff of the heterogeneous network, the access node and the radio node of the air interface before performing the heterogeneous network handoff are performed. Establishing a tunnel between the access nodes of the air interface that performed the network handoff, and the terminal uses the set tunnel to obtain an IP address from the access node of the air interface before performing the heterogeneous network handoff. Providing a presence service to a terminal moving the heterogeneous network, including a step of assigning and transmitting a current information of the terminal to a presence network agent using the set tunnel; In addition, there is an advantage of knowing which wireless interface the terminal is connected to.

Presence service, A-P interface, heterogeneous network handoff, current information of terminal

Description

Method for updating presence service information in heterogeneous network environment using presence network agent {METHOD FOR UPDATING PRESENCE SERVICE INFORMATION ON HETEROGENEOUS NETWORK BY PRESENCE NETWORK AGENT}

1 is a diagram illustrating the structure of a presence service network defined in the 3GPP standard;

2 is a diagram illustrating a heterogeneous network environment structure in a presence service structure using a presence network agent according to the prior art;

3 is a diagram illustrating a structure in which a terminal hands off a heterogeneous network between a CDMA-2000 and WiBro in a presence service structure using a presence network agent according to an embodiment of the present invention;

4 is a diagram illustrating a procedure for handing off a heterogeneous network from a 3G (WiBro) to a WiBro in a presence service structure using a presence network agent according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating a procedure for handing off a heterogeneous network from a WiBro to a 3G generation in a presence service structure using a presence network agent according to an embodiment of the present invention; and

FIG. 6 illustrates the structure of an A11 Registration Message defined in the 3GPP2 standard. FIG.

The present invention relates to a method for updating presence service information in a heterogeneous network environment. In particular, the present invention provides a presentation in a heterogeneous network environment using a presence network agent (hereinafter, referred to as a PNA). It relates to a method for updating service information.

The presence service refers to a service that provides presence information, such as checking a user's location information, checking a user's communication status, that is, checking a user's online or offline status, and checking a media type. For example, Instant Messenger, which has recently been used as an online communication means between Internet users, is a service for sending a message to a user who is online by using the presence information. It is a form.

1 illustrates the structure of a presence service network defined in the 3rd Generation Partnership Project (3GPP) standard.

Referring to FIG. 1, in order to provide a presence service, a presence server 117 is a presentation of users who provide a presence, that is, presence information to be stored and distributed. The presence information is provided to perform the function of providing the presence information to other users who want to know the presence information.

According to the object of providing the presence information to the presence server 117, the presence external agent (hereinafter referred to as PEA) 101, the presence user agent (hereinafter referred to as PUA) ( 103) and Present Network Agent (hereinafter referred to as PNA) 105.

First, the PEA 101 receives the presence information of the presence service subscriber from an external network and provides it to the presence server 117 using a P _ex interface.

The PUA 103 receives the presence information directly from a user and provides the presence information to the presence server 117 using a P _eu interface. In addition, the PUA 103 is connected to the Presentity Presence Proxy 113 using the P _ep interface.

The PNA 105 receives the presence information through a network and provides the presence information to the presence server 117 using a P _en interface. Therefore, the PNA 105 requires several network elements and interfaces connecting the network elements and the PNA 105. Here, the number of network elements and interfaces, the first P _r interface using the 3GPP AAA Server (3rd Generation Partnership Project Authentication Authorization and Accounting Server) (119) in the 3G authentication of the terminal included in a radio network, permission, billing The information is provided, and it is possible to know whether the subscriber is receiving an interworking service with a wireless LAN (WLAN) in the PDG (Packet Data Gateway) 121 using the P _p interface. Further, in the HSS / HLR (Home Subscriber System / Home Location Register) (123) using a P _h Interface been provided with the access means and the profile information and authentication information of the user, S-CSCF using the P _i interface ( In the Serving-Call Session Control Function (125), it is possible to know whether the subscriber uses the IP Multimedia Subsystem (IMS) network, and the MAC Server / VLR (Media Access Control Server / Visitor Location Register) 127 using the P _c interface. It is possible to find out whether the subscriber uses the CS service, and the PDP packet of the subscriber in the SGSN (Serving GPRS Node) 129 and the GGSN (Gateway GPRS Node) 131 using the P _g and P _k interfaces. know the status of the Data Protocol context), and using a P _l interface receives a location information of the user from the Gateway Mobile location Control (GMLC) ( 133).

The presence information obtained from the PEA 101, the PUA 103, and the Pna 105 may be provided to the Watcher application 107 using the P _w interface so that another user may use the presence information. Will be available. The watcher application 107 is an application program for the other user to use the presence information. If the watcher application 107 does not provide a presence service in a terminal used by the other user, Performs a series of operations for providing a presence service to the terminal.

FIG. 2 illustrates a heterogeneous network environment structure in a presence service structure using a presence network agent according to the prior art. In the following description, the heterogeneous network will be described by using a CDMA-2000 (Code Division Multiple Access-2000), which is a cellular network, and a WiBro, which is a broadband mobile communication. In the following description, the mobile communication terminal will be described as an example of a dual band dual mode (DBDM) terminal that can be used in both the WiBro and the CDMA-2000.

Referring to FIG. 2, first, the PNA 202 uses a P _en interface to present presence information of a user equipment (UE) 210 in order to provide the presence service. It transmits to the presence server (Presence Server) (200).

If the air interface (Air interface) a WiMAX environment 216 of the MS 210, (Access Control Router), ACR (204) is the P _k to PNA (202) the presence information of the MS 210 Use it as an interface to transmit (214). Here, the ACR 204 is a state information (eg, active, sleep, idle), IP address, SFID (Service Flow ID), paging group (Paging Group) information, etc. of the terminal 210 in the WiBro network (WiBro) network Having

On the other hand, when the air interface of the terminal 210 is CDMA-2000 218, a packet control function (hereinafter referred to as a PCF) 208 transmits the presence information of the terminal 210 to a packet data service. The packet is transmitted to the node (Packet Data Service Node: PDSN) 206 using the A11 interface (220). However, the PDSN 206 or the PCF 208 does not define an interface for transmitting separate status information to the PNA 202 (222). That is, the presence information of the terminal 210 connected to the CDMA-2000 air interface cannot be transmitted to the PNA 202. Here, the PCF 208 includes the state information of the terminal 210 in the CDMA-2000 network, and the PDSN 206 provides a billing / authentication function, a PPP function, an IP routing function, a vertical handoff function to a user. And so on.

As described above, the interface for transmitting the presence information of the terminal 210 to the PNA 202 is not defined in the CDMA-2000, that is, 3G (3rd Generation) to support the presence service. When performing vertical hand-off from the WiBro to the 3G, the terminal 210 can communicate using the 3G air interface, but the PNA 202 is connected to the 3G network. Since the presence information of the terminal 210 is unknown, there is a problem that the terminal 210 seems to be disconnected from the network.

On the contrary, when performing the vertical handoff to the WiBro in the 3G, even though the terminal 210 is continuously receiving service from the 3G network, the terminal 210 in the ACR 204 of the WiBro network. Since there is no method for notifying that only the air interface has changed and continuously communicating, the ACR 204 has a problem in that the terminal 210 is recognized as if it is added to the network.

Accordingly, an object of the present invention is to provide a method for supporting a presence service in a plurality of access network environments.

Another object of the present invention is to provide a method for supporting a presence service when a terminal supporting a plurality of access networks performs a vertical handoff.

Another object of the present invention is to provide a method for delivering the presence information even when the type of the air interface to which the terminal belongs is changed when the presence information of the terminal is transmitted to a presence network agent.

Another object of the present invention is to provide a method for delivering presence information of a terminal using a layer 2 extension setting message.

According to a first aspect of the present invention for achieving the above objects, a method for supporting a presence service in a wireless communication terminal, when the terminal performs handoff between the heterogeneous networks, Establishing a tunnel between an access node of an air interface before performing a handoff and an access node of the air interface that performed the handoff between the heterogeneous networks, and the terminal uses the set tunnel Before performing the handoff between the networks, receiving an IP address from an access node of an air interface, and transmitting current information of the terminal to a presence network agent by using the established tunnel. Characterized in that.

According to a second aspect of the present invention, a method for providing a presence service when a terminal supporting WiBro and Code Division Multiple Access-2000 (CDMA-2000) moves from WiBro to CDMA-2000 includes: Layer 2 of the CDMA-2000 receives a handoff request message between heterogeneous networks and a tunnel between the Packet Data Service Node of the CDMA-2000 and the WiBro Access Control Router. And a step of, by the terminal, assigning an IP from the access control router using the set tunnel, and transmitting current information of the terminal to the access control router using the set tunnel. Characterized in that.

According to a third aspect of the present invention, a method for providing a presence service when a terminal supporting WiBro and Code Division Multiple Access-2000 (CDMA-2000) moves from CDMA-2000 to WiBro is provided. The second layer of the tunnel establishes a tunnel between the access control router of the WiBro and the packet data service node of the CDMA-2000 that receives the handoff request message between the heterogeneous networks. And a step of receiving an IP from the packet data service node using the set tunnel, and transmitting the current information of the terminal to the presence network agent through the access control router. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, a description will be given of a technique for allowing a terminal supporting a plurality of access networks to support a presence service based on a presence network agent (hereinafter, referred to as a PNA). In the following description, the plurality of wireless interfaces is meant to include all of WiBro, Wireless LAN, Wideband Code Division Multiple Access (WCDMA), and Code Division Multiple Access-2000 (CDMA-2000). The description will be given using the CDMA-2000 and WiBro as an example. In the following description, the mobile communication terminal will be described as an example of a dual band dual mode (DBDM) terminal that can be used in both the WiBro and the CDMA-2000.

FIG. 3 illustrates a structure in which a terminal performs vertical hand-off between CDMA-2000 and WiBro in a presence service structure using a PNA according to an embodiment of the present invention. In the following description, FIG. 3A illustrates a structure in which a mobile communication terminal performs a vertical handoff from the CDMA-2000 to the WiBro, and FIG. 3B illustrates a structure in which the mobile communication terminal performs a vertical handoff from the WiBro to the CDMA-2000. Doing. Here, the vertical handoff means handoff between the heterogeneous networks (different networks). The handoff between the heterogeneous networks is called a vertical handoff (interlayer handoff) because the handoff is not possible through the upper layer, but only through a connection procedure established from the lower layer to the upper layer.

First, referring to FIG. 3A, when a user equipment (UE) 312 performs a vertical hand-off to WiBro from the CDMA-2000, the UE 312 may access the ACR. A vertical handoff request message is sent to the router 304. The ACR 304 transmits (324) an AP Registration Request message to the PDSN 308 based on the received vertical handoff request message, so that the terminal 312 sends the PDSN 308. Is assigned an IP address.

That is, since the terminal 312 performs the vertical handoff with the WiBro, the ACR 304 manages the air interface and the MAC (Media Access Control) of the terminal 312 and is assigned an IP address assigned by the PDSN 308. Communicate 318 with a Correspondent Node (CN) 306 via an address. Here, the CN 306 is connected by using a packet data network (PDN).

Since the presence information of the terminal 312 is managed by the ACR 304, the ACR 304 manages the presence information of the terminal 312 through the P _k interface 318. To be sent). Thereafter, the PNA 302 transmits the received presence information of the terminal 3120 to the presence server 300 using the P _en interface to provide the presence service.

Referring to FIG. 3B, when the terminal 312 performs a vertical handoff from the WiBro to the CDMA-2000, the terminal 312 sends a vertical handoff request message to the PDSN 308. Message). The PDSN 308 transmits an AP registration request message to the ACR 304 based on the received vertical handoff request message (330), so that the terminal 312 is the ACR 304 Is assigned an IP address.

That is, the terminal 312 communicates with the CN 306 with the IP address assigned from the ACR 304 (332), but the air interface and MAC information of the terminal 312 is in the CDMA-2000 region. Manage. Here, the CN 306 is connected by using a packet data network (PDN). When the terminal 312 is vertical handoff to the CDMA-2000, since the presence information of the terminal 312 is held by the PCF 310, the PCF 310 uses the A11 interface 322 to transmit the terminal information. The presence information of 312 is transmitted to the ACR 304. Here, the A11 interface transmits an A11 registration request-refresh including the presence information of the terminal 312 from the PCF 310 to the PDSN 308 at regular intervals. In addition, the A11 stored message periodically transmits the application subtype “All Dormant Indicator” of the application type “Indicator” in the “Normal Vender / Organization Specific Extension” of the message, as shown in FIG. Informs the state of the terminal 312.

That is, when the presence information of the terminal 312 is transmitted to the PDSN 308 at regular intervals, the PDSN 308 uses the AP refresh request message (AP Registration Request-Refresh) to the terminal 312 The presence information of the ACR 304 is transmitted.

When the ACR 304 receives the presence information of the terminal 312, that is, the ACR 304 can know the status information of the CDMA-2000 and the MAC that the PCF 310 has, The ACR 304 transmits the presence information including the information that the terminal 312 is connected to the CDMA-2000 to the PNA 302 using the P _k interface 316.

Thereafter, the PNA 302 transmits the presence information of the terminal 312 to the presence server 300 using the P _en interface 314 to provide a presence service.

FIG. 4 illustrates a procedure of vertical handoff from a CDMA-2000 to WiBro in a presence service structure using a presence network agent according to an embodiment of the present invention. The following description shows the procedure of the vertical handoff structure of FIG. 3A.

Referring to FIG. 4, when performing a vertical hand-off from the CDMA-2000 to WiBro, a terminal (PSS: Personal Subscriber Station) determining the vertical hand-off is performed. In step 421, the 400 requests an ACR 404 a layer 2 vertical handoff (L2 Vertical H / O request). Upon receiving the vertical handoff request message, the ACR 404 requests an AP interface storage request from a packet data service node (PDSN) 408 for the second layer vertical handoff. Request) message and presence information (PI) are transmitted together (step 422).

Thereafter, the PDSN 408 transmits an A-P interface registration response to the ACR 404 corresponding to the R-P interface (RN) (step 423). Here, the R-P interface is used to transmit packet data between the PCF 406 and the PDSN 408 in a 3G network, and the A11 interface is used in the present invention.

Upon receiving the response to the AP interface, the ACR 404 determines that the AP tunnel is established between the PDSN 408 and the ACR 404 to perform L2 extension handoff. 400) (Vertical H / O Response) (step 424).

Thereafter, the ACR (404) is the terminal 400 presence information the P _k interface for RADIUS (Remote Authentication Dial-In User Services) access request (Access Request) using a message (Presence Network Agent) PNA's (410 In step 425, the PNA 410 receiving the RADIUS access request message sends a RADIUS access response message to the ACR 404 (step 426). The PNA 410 updates the presence information on the presence server 414 using an IMS-based network (step 427).

Thereafter, when the state of the MAC (Media Access Control) of the UE located in the ACR 404 is changed (step 428), the ACR 404 sends a Pk interface message (RADIUS access-request) to the changed MAC state information of the UE. (PI update) is transmitted to the PNA 410 (step 429).

5 illustrates a procedure for vertical handoff from WiBro to CDMA-2000 in a presence service structure using a presence network agent according to an embodiment of the present invention. The following description shows the procedure of the vertical hand off structure of FIG. 3B.

Referring to FIG. 5, when performing a vertical handoff from the WiBro to the CDMA-2000, the terminal determines the vertical handoff (PSS: Personal Subscriber Station). 500 requests a two-layer vertical handoff (L2 Vertical H / O Request) to the Packet Data Serving Node (PDSN) 504 (step 521). The PDSN 504 receiving the handoff request transmits an AP interface storage request message corresponding to an RP interface to the access control router (ACR) 508 together with the presentation information (AP interface Registration Request with Presence Information). (Step 522).

Thereafter, the ACR 508 transmits a response corresponding to the R-P interface (A-P Registration Response) to the PDSN 504 (step 523). The PDSN 504, which has received a response corresponding to the RP interface, sets the AP tunnel between the ACR 508 and the PDSN 504 to perform a L2 extension handoff. Inform 500 (Vertical H / O Response) (step 524).

Thereafter, the ACR (508) is the presence information of the terminal (500) P _k RADIUS of the interface (Remote Authentication Dial-In User Services ) access request (Access Request) using messages presence network agent (Presence Network Agent In step 525, the PNA 510 receives the RADIUS access request message and sends a response message of the RADIUS access request message to the ACR 508. After transmitting (step 526), the PNA 510 transmits the presence information to the presence server 514 using the IMS-based network 512 (step 527). Here, the presence information of the terminal 500 includes information that the terminal 500 is connected to 3G.

Since the terminal 500 is connected to the CDMA-2000, the MAC state of the terminal 500 is managed by a packet control function 502. The PCF 502 periodically transmits state information of the terminal 500 to the PDSN 504.

When the status information update period of the terminal 500 is reached (step 528), the PCF 502 transmits the status information of the terminal 500 to the PDSN 504 (A11 Registration Request-refresh). Thereafter, the PDSN 504 transmits the status information to the ACR 508 (AP Registration Request-refresh), and the ACR 508 sends the status information of the terminal 500 to the PNA 510. The presence server transmits the data to the presence server 514 (step 529).

6 shows the structure of an A11 Registration Message as defined in the 3GPP2 standard.

Referring to FIG. 6, in the A11 registration message, a life time, which is a time for verifying a path of an RP interface, a home address, which is an IP address of a mobile node, and a home agent address of the mobile node. In-Home Agent, and also includes a care of address (COA) indicating the address of the end of the tunnel, the application type "Indicator" in the "Normal Vender / Organization Specific Extension" that is part of the message according to the present invention The application subtype “All Dormant Indicator” is periodically transmitted to provide the presence information of the terminal which has vertical handoff to the PDSN (Packet Data Service Network).

Meanwhile, 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 determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, in a network that supports a plurality of air interfaces at the same time, the presence service is provided to a terminal moving this type network, and the advantage of knowing which air interface the terminal is connected to There is this. Furthermore, since the information is transmitted using an option field already present in the layer 2 extension configuration message, there is an advantage that the cellular network can provide the presence service without any additional additions.

Claims (11)

A method for supporting a presence service in a wireless communication terminal supporting a plurality of access networks, the method comprising: When the terminal performs handoff between heterogeneous networks from the first access node of the first access network to the second access node of the second access network, the first access node is requested by the second access node. Establishing a tunnel between the second access node and the second access node; The terminal, performing communication using the IP address provided from the first access node through the tunnel; And transmitting the current information of the terminal to a presence network agent through any one of the first access node and the second access node that support the presence service using the established tunnel. , When the terminal communicates using the IP address provided from the first access node, the wireless interface and the MAC of the terminal are managed by the second access node. The method of claim 1, The plurality of access networks may include WiBro, Wireless LAN, Wideband Code Division Multiple Access (WCDMA), and Code Division Multiple Access-2000 (CDMA-2000). The method of claim 1, The tunnel is set up using an L2 extension setup message. A method for providing a presence service when a terminal supporting a broadband mobile communication network and a cellular network moves from a broadband mobile communication network to a cellular network, The packet data service node of the cellular network and the access control router of the broadband mobile communication network in which the second layer of the terminal receives a handoff request message between heterogeneous networks. The process of establishing a tunnel between The terminal receiving an IP from the access control router using the established tunnel; And transmitting the current information of the terminal to the access control router using the established tunnel. The method of claim 4, wherein The tunnel is set up using an Access Control Router-Packet Data Service Node (A-P) interface. The method of claim 4, wherein The process of transmitting the presence information, Transmitting to the packet data service node from a packet control function including current information of the terminal; And transmitting, by the packet data service node receiving the current information of the terminal, to the access control router. The method of claim 6, And transmitting the current information of the terminal between the packet control function and the packet data service node using an A11 interface. The method of claim 6, The current information transmission of the packet data service node and the terminal of the access control router is configured using an Access Control Router-Packet Data Service Node (A-P) interface. The method of claim 4, wherein And the current information of the terminal includes information that the terminal has handed off between the heterogeneous networks to a cellular network. A method for providing a presence service when a mobile station supporting a broadband mobile communication network and a cellular network moves from a cellular network to a broadband mobile communication network, An access control router of the broadband mobile communication network and a packet data service node of the cellular network in which the second layer of the terminal receives a handoff request message between heterogeneous networks. The process of establishing a tunnel between them, Receiving an IP from the packet data service node using the established tunnel; Transmitting the current information of the terminal to the presence network agent through the access control router. The method of claim 10, The tunnel is set up using an Access Control Router-Packet Data Service Node (A-P) interface.

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