KR20060115561A - Method and apparatus for notifying change of service information according state of terminal in wireless telecommunications system - Google Patents

Abstract

A method and an apparatus for notifying changed service information according to a terminal state in a wireless communication system are provided to enable various services to be used directly from a user's point of view and to be provided to users from a service provider's point of view. A method and an apparatus for notifying changed service information according to a terminal state in a wireless communication system comprises the following several steps. A connection with the other side UE(UE-B) is established and a service is used via the connection(200). An available service list(UE-ASL-A) for a UE(UE-A) is updated according to the state change, upon generation of an event triggering a change in the state of the UE(UE-A) during the service(202-206). The updated service list(UE-ASL-A) is sent to the other side UE(UE-B)(210). An available service list(UE-ASL-B) for the other side UE(UE-B) is acquired(211-218). The updated service list(UE-ASL-A) is compared with the service list(UE-ASL-B) and a list of common available services is updated according to the comparison(220-224). The user is notified of the updated common available services, while maintaining the connection(226).

Description

METHOD AND APPARATUS FOR NOTIFYING CHANGE OF SERVICE INFORMATION ACCORDING STATE OF TERMINAL IN WIRELESS TELECOMMUNICATIONS SYSTEM}

1 is a diagram illustrating a radio capability exchange procedure of a combined (CSI) service of a circuit switched (CS) call and an Internet multimedia subsystem (IMS) session.

2 is a diagram of UE-A notifying each user of a UE Available Services List (UE-ASL) when an event occurs in UE-A making a connection with UE-B according to the first embodiment of the present invention. Flowchart showing the operation.

3 is a flowchart illustrating the operation of UE-B according to the first embodiment of the present invention.

4 is a flowchart illustrating IMS signaling according to the first embodiment of the present invention.

5 is a diagram illustrating a format of an OPTIONS + message used in an embodiment of the present invention.

6 illustrates the format of a NOTIFY message used in an embodiment of the present invention.

7 is a flowchart illustrating CS signaling according to the first embodiment of the present invention.

8 is a diagram of UE-A notifying each user of UE Available Services List (UE-ASL) when an event occurs to UE-A making a connection with UE-B according to the second embodiment of the present invention. Flowchart showing the operation.

9 is a flowchart illustrating operation of UE-B according to a second embodiment of the present invention.

10 is a flowchart illustrating IMS signaling according to a second embodiment of the present invention.

11 is a flowchart illustrating CS signaling according to a second embodiment of the present invention.

12 is a flowchart illustrating CS signaling according to another example of the second embodiment of the present invention.

13 illustrates an apparatus of a UE according to a preferred embodiment of the present invention.

14 illustrates a network device according to a preferred embodiment of the present invention.

The present invention relates to a combined CS call and IMS session (hereinafter referred to as CSI) of a circuit service (Circuit Switched) call and an Internet Protocol Multimedia Subsystem (hereinafter referred to as IMS) session. In particular, the service information according to the state change of the user equipment (hereinafter referred to as UE) having a connection with the other party (entity) is exchanged with the other party and the service information to participate in the connection; It is about a method and apparatus for notifying a user or an object.

The circuit switched (CS) scheme is for a typical voice service, and means a scheme in which a fixed call path of CS based is formed between one user and the other user. In contrast, the Internet Multimedia Subsystem (IMS) uses a packet-based unfixed call path based on the Internet Protocol (hereinafter referred to as IP) to increase transmission efficiency and ensure stability. These IMS can support not only simple one-to-one calls but also connections involving multiple users.

For example, the Global System for Mobile communications (GSM) and Enhanced Data Rates GSM Evolution (EDGE) radio access networks (GSM / EDGE Radio Access Network, hereinafter referred to as GERAN) basically support CS calls. Based on the Universal Mobile Telecommunications System (UMTS), the Radio Access Network (UTRAN) can support not only CS calls but also IMS-based multimedia services. Two users using a dual mode terminal having accessibility to the GERAN and the UTRAN are accessing a CS call in a plane GERAN region and a UTRAN region, respectively. In this case, when a user of the plane GERAN region hands over to the UTRAN region, the user can use an enhanced packet switched service such as messaging or file transmission and reception at the same time as the CS call.

As described above, when a state change occurs in a UE having a connection with a counterpart entity, there may be a change in a service that can be actually used by users participating in the connection. However, in the conventional system, there is no way to inform the users or entities participating in the connection of the changed available services.

In the prior art, there is a service for exchanging whether a corresponding service is available at a service start time. In detail, the CSI service combined with the CS call and the IMS session exchanges a radio state to which the user belongs during the call setup to inform the user of service availability. The CSI service uses CS calls for voice calls, and IMS sessions for enhanced packet switched (PS) services, for example messaging or file transfer. The CSI terminal and the dual mode terminal of the CS and the PS may support the CSI service. Since the CSI service uses both the CS network and the PS network (including the IMS domain) as described above, it is available in the Dual Transfer Mode (DTM) GERAN or UTRAN region. That is, in the CSI service, radio capability information of a region where a terminal is located is used as information indicating whether service of a corresponding region is available.

1 is a flowchart illustrating a radio capability exchange procedure of a CSI service. Here, the UE-A 100 and the UE-B 110 both support the CSI service or dual modes of the CS service and the PS service, and the UE-A 100 supports the CS domain-A 102. The IMS Core-A 104 is accessed through, and the UE-B 110 accesses the IMS Core-B 106 via the CS Domain-B 108.

As shown in FIG. 112, the UE-A 100 carries a current radio environment of the current location of the UE-A 100 in a SETUP message for setting up a CS call. To 110). In step 114, the CS-A-102 connected to the UE-A 100 may transmit an IAM (Initial Address Message) message including the radio state information of the UE-A 100 to the UE-B 110. It is sent to the connected CS domain-B 108. In step 116, the CS domain-B 108 sends a SETUP message including the radio state information to the UE-B 110, and the UE-B 110 sends the radio state information to the UE-A 100. Save it. Subsequently, in step 118, the UE-B 110 transmits radio state information of the region to which the UE-B 110 belongs to the UE-A 100 in a CONNECT message. CS domain-B 108 includes the radio state information in the CON message and sends it to CS domain-A 102. In step 122, CS domain-A 102 includes the radio state information in the CONNECT message to the UE. Send to -A (100). Likewise, UE-A 100 stores the radio state information.

As such, when establishing a CS call, both UEs may know radio function information available in the region where they are currently located, that is, types of available CSI services. However, as mentioned above, when a state change such as a handover occurs in one terminal after call establishment, other users participating in the connection cannot know the changed service information due to the state change. As a result, even when the PS service is available, there is a problem that the PS service cannot be used and thus does not satisfy the user's request.

Therefore, the present invention, which is designed to solve the problems of the prior art operating as described above, a method for notifying other terminals connecting to the terminal of the type of service changed due to the state change of the terminal connecting to the call. And to provide an apparatus.

The present invention provides a method and apparatus for checking available services of a terminal when an event of a terminal connected to a call is changed and notifying other terminals connected with the terminal to the checked service information.

According to a preferred embodiment of the present invention, in a method of notifying service information changed according to a state change of a terminal UE-A in a wireless communication system,

Establishing a connection with a UE-B and using a service using the connection;

Updating an available service list (UE-ASL-A) of the UE (UE-A) according to the state change when an event causing a state change occurs during the connection;

Transmitting the UE-ASL-A to the counterpart terminal;

Obtaining a usable service list (UE-ASL-B) of the counterpart terminal;

Comparing the UE-ASL-A with the UE-ASL-B and updating a service list (ASL) indicating services that can be used in common;

And notifying the user of the updated ASL while maintaining the connection.

According to a preferred embodiment of the present invention, in a method of receiving, by a terminal UE-B in a wireless communication system, service information changed according to a state change of a counterpart terminal UE-A,

Establishing a connection with a UE-A and using a service using the connection;

Receiving an available service list (UE-ASL-A) of the counterpart terminal updated according to a state change of the counterpart terminal during the connection;

Comparing the UE-ASL-A with the available service list (UE-ASL-B) of the terminal and updating a service list (ASL) indicating services available in common;

And notifying the user of the updated ASL while maintaining the connection.

According to a preferred embodiment of the present invention, in a method of notifying service information changed according to a state change of a terminal in a network device of a wireless communication system,

Establishing a connection between terminals through the network device and providing a service using the connection;

As an event causing a state change occurs in one of the UEs UE-A, an available service list UE-ASL-A of the UE-A updated according to the state change is generated from the UE-A. Receiving process,

And transmitting the received UE-ASL-A to a counterpart network device that is connected to the counterpart UE-B of the UE-A.

According to a preferred embodiment of the present invention, in a method of notifying service information changed according to a state change of a terminal UE-A in a wireless communication system,

Establishing a connection with a UE-B and using a service using the connection;

Updating an available service list (UE-ASL-A) of the UE (UE-A) according to the state change when an event causing a state change occurs during the connection;

Comparing the available service list (UE-ASL-B) of the counterpart terminal previously stored with the updated UE-ASL-A;

If there is a change in the ASL according to the comparison result, updating the ASL;

Transmitting the updated ASL to the counterpart terminal;

And notifying the user of the updated ASL while maintaining the connection.

According to a preferred embodiment of the present invention, in a method of notifying service information changed according to a state change of a terminal in a network device of a wireless communication system,

Establishing a connection between terminals through the network device and providing a service using the connection;

As an event causing a state change occurs in one of the UEs UE-A, the UE-A updated according to the state change and the UE-B of the UE-A are jointly used. Receiving a service list (ASL) indicating possible services from the UE-A;

And transmitting the received ASL to a counterpart network device connected to the counterpart UE-B.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The main subject of the present invention to be described later, when a condition change event occurs in the user terminal (UE), check the services available to the UE according to the event, and a message containing the confirmed service information Exchange with a counterpart entity that has a connection with the UE. As a result, entities connecting to the UE may know services actually available to the UE in a changed environment. In the following description, a service information notification refers to a procedure of notifying the counterpart entities connecting with the UE of service information indicating possible services according to a state change.

The counterpart entity may be any type of entity or network node that can establish a connection with the UE, such as a server, a user terminal (UE), and the like. In the present specification, for the convenience of description, it will be described that the counterpart entity is a user terminal (UE), but it will be apparent that such a technique does not limit the scope of the present invention. Specifically, one entity will be referred to as UE-A, and the other entity will be referred to as UE-B.

In addition, the condition (condition) of the UE is a set of characteristics that may indicate the environment (environment) to which the UE participating in the connection belongs. The characteristics include GERAN, DTM GERAN, UTRAN region, PS domain baring state, data rate, IMS serviceable state and the like. Baring here refers to an operator setting the UE to not use a specific service (eg, a PS service) in a specific cell. For example, when a service request of a UE cannot be accepted due to a limitation of a function of providing a PS service in a specific cell, this is called an operator PS service baring. State changes are caused by events. The event may include a handover of a UE, a PS attached or PS detached, an IMS registration, a situation change in an area where a user is served, a change of an operator policy, and the like. The change in state may or may not result in a change in the service available to users participating in the connection.

The UE available service list (hereinafter referred to as UE-ASL) is a list of services available to the UE in its current state, updated when the UE wants to check its UE-ASL or after the UE changes its state. do. The UE-ASL is a service list before comparing with the UE available service of the other party. UE-ASL is selected from the UE Supported Service List (UE-SSL). UE-SSL is a list of services predetermined according to terminal capability of a user and types of services subscribed to by a user, and is a list of all services that the UE can support. UE-SSL can be updated by a user or a service operator. UE-enabled service of UE-A is represented by UE-ASL-A, and UE-enabled service of UE-B is represented by UE-ASL-B.

The available service list (hereinafter referred to as ASL) is a list of services that UE-ASL-A and UE-ASL-B have in common, and shows a list of services actually available during connection with a counterpart entity. The services that may be included in the ASL may be a service of a large concept such as the CS-based service or the PS-based service, or may be a detailed PS-based service such as a multimedia messaging service (MMS) or a file transfer protocol (FTP). . Each UE participating in the connection notifies each user of the ASL.

The above-described ASL, UE-ASL, UE-SSL, etc. are [service information] related to the UE, and can be stored in all kinds of storage locations that the UE can refer to in the terminal.

The present invention provides two embodiments for service information notification. The first embodiment exchanges UE-ASL when exchanging service information, and the second embodiment exchanges ASL. In the following, the two embodiments will be described separately.

<< first embodiment >>

2 is a diagram of UE-A notifying each user of a UE Available Services List (UE-ASL) when an event occurs in UE-A making a connection with UE-B according to the first embodiment of the present invention. A flow chart showing the operation.

As shown, in step 200 there is a connection between the UE-A and the UE-B. The UE-A and the UE-B use the connection to use a service such as a voice call. If an event occurs in the UE-A in step 202, the UE-A determines whether there is a state change according to the event in step 204. If there is no state change (203), the UE-A returns to the process of monitoring the occurrence of the event. If there is a state change (205), in step 206, the UE-A identifies and stores the UE-ASL-A according to the state change. The UE-ASL-A is a list of services that the UE-A can support after the state change.

In step 208, the UE-A determines a message exchange method and performs an associated procedure to send the UE-ASL-A to the UE-B. The message exchange method follows the user's preference method or operator's preference method. In addition, the message exchange method may be selected by the user or operator at each event occurrence, or the method selected when the first event occurs may continue to be used thereafter. In the present invention, CS signaling and IMS signaling are proposed as a message exchange method. A detailed procedure of message exchange according to the CS signaling will be shown in FIG. 7, and a detailed procedure of message exchange according to the IMS signaling will be shown in FIG. 4.

In step 210, the UE-A transmits the UE-ASL-A to the UE-B using the determined message exchange scheme. In step 212, the UE-A determines whether the UE-ASL-B needs to be received. When UE-ASL-B reception is required (211), there is no UE-ASL-B previously stored by UE-A because there is no state change of UE-B. In this case, in step 214, the UE-A receives the UE-ASL-B from the UE-B according to the determined message exchange scheme, stores the UE-ASL-B in step 218, and proceeds to step 220. At this time, in step 216, the UE-A may transmit an acknowledgment (acck) indicating that the UE-ASL-B is normally received. On the other hand, if the UE-ASL-B reception is not necessary in step 212 (213), the UE-A already has the UE-ASL-B, and proceeds directly to step 220.

In step 220, the UE-A compares the UE-ASL-B with the UE-ASL-A. In step 222, the UE-A determines whether an ASL change is necessary according to the comparison result. If there is no change in the ASL (221), the process returns to step 202. On the other hand, if there is a change in the ASL (223), the process proceeds to step 224 to update the ASL. Here, ASL is a list of services that the UE-A and the UE-B can support in common, and are determined by services included in the UE-ASL-A and the UE-ASL-B in common. In step 226, the UE-A notifies the user A using the UE-A of the updated ASL while maintaining the existing connection.

3 is a flowchart illustrating the operation of UE-B according to the first embodiment of the present invention.

As shown, there is a connection between UE-A and UE-B in step 300. In step 302, the UE-B receives the UE-ASL-A from the UE-A, and replaces, ie, updates, the UE-ASL-A previously stored in the received UE-ASL-A in step 304. In step 306, the UE-B determines whether transmission of the UE-ASL-B is necessary. If transmission of the UE-ASL-B is required (305), the UE-B sends a UE-ASL-B to the UE-A in step 308, and then proceeds to step 312. In step 310, the UE-B may receive an acknowledgment that the UE-ASL-B has been normally received from the UE-A. On the other hand, if the transmission of the UE-ASL-B is not required (307), the process proceeds directly to step 312.

In step 312, the UE-B compares the UE-ASL-A with the UE-ASL-B. In step 314, the UE-B determines whether there is a change in the ASL according to the comparison result. If there is no change in the ASL, the process returns to step 302. On the other hand, if there is a change in the ASL, the process proceeds to step 315 316 to update the ASL. In step 318, the UE-B notifies the user B using the UE-B of the updated ASL while maintaining the existing connection.

As such, the present invention updates the ASL to be used in the connection while maintaining the connection of the UE-A and the UE-B, and notifies users related to the connection of the update of the ASL. The notification may be made by a screen display or a voice.

4 is a flowchart illustrating IMS signaling according to the first embodiment of the present invention. Here, the UE-A 400 and the UE-B 410 may use CSI services, and the UE-A 400 uses the CS domain-A 402 when using a CS call, and an IMS core-A when using an IMS call. 404 is used. Similarly, UE-B 410 uses CS Domain-B 408 when using a CS call and IMS Core-B 406 when using an IMS call.

As illustrated, in step 412, the UE-A 400 and the UE-B 410 are only performing voice calls using the CS call. In step 414, the UE-A 400 performs a handover to a region where CSI service is available (for example, a UTRAN region), and in step 416, the UE-A 400 includes a UE-ASL-A including CSI valid information. Update In this case, the UE-A 400 determines to exchange messages with the UE-B 410 through IMS signaling. If the UE-A 400 is not IMS registered, in step 418, the UE-A 400 performs IMS registration with the IMS Core-A 404. In step 420, the UE-A 400 includes the UE-ASL-A in the Supported header of the OPTIONS + message and sends it to the UE-B 410. In the present embodiment, it is assumed that UE-ASL-A contains only CSI valid information, and then UE-ASL-A and CSI valid information are the same.

The OPTION + message is a modified form of the OPTIONS message according to the Session Initiation Protocol (SIP). The OPTION + message is used to query the capability of the other party and receives a 200OK message in response. In the present invention, both a typical OPTIONS message and a modified OPTIONS + message can be used. When using the OPTIONS message, when the UE-A 400 sends the OPTIONS message to the UE-B 410, the UE-B 410 adds CSI valid information to the support header of the 200OK message (Supported: CSI available). ) UE-A 400. In contrast, when the UE-B 410 sends an OPTIONS message to the UE-A 400, the UE-A 400 adds CSI valid information to the support header of the 200OK message (Supported: CSI available). To). The OPTIONS + message further includes a support header having a [Service Information Notification] function in the format of the OPTIONS message. That is, the OPTIONS + message may include not only a simple query but also service information of the sender in the support header.

5A illustrates the format of an OPTIONS + message used in an embodiment of the present invention. As shown, the OPTIONS + message 500 further includes a support header in a typical OPTIONS message. The support header is service information of the transmitting side, and may contain, for example, CSI valid information.

Upon receiving the OPTIONS + message from the UE-A 400, the IMS Core-A 404 transmits the OPTION + message to the IMS Core-B 406 in step 422. In step 424, the IMS Core-B 404 delivers the OPTIONS + message to the UE-B 410. In step 426, the UE-B 410 adds CSI valid information extracted from the OPTION + message to previously stored UE-ASL-A. If the UE-B 404 needs to transmit the UE-ASL-B to the UE-A 400, the UE-B 410 sends the UE-ASL-B to the 200OK + message in steps 428, 430, and 432. It includes and delivers to the UE-A (400). The 200OK + message has the meaning of Ack.

The 200OK * message adds a support header with a [Service Information Notification] function to a typical 200OK message according to SIP. 5B is a diagram illustrating the format of a 200OK + message used in the first embodiment of the present invention. As shown, the 200OK + message 502 further includes a support header in a typical 200OK message. The support header is service information of the transmitting side, and may contain, for example, CSI valid information. If the transmission of the UE-ASL-B is not necessary, the UE-B 410 transmits a typical 200OK message to the UE-A 400 as an acknowledgment in steps 428 to 432.

The UE-A 400 receiving the 200OK + message or the 200OK message updates the UE-ASL-B in step 440, and compares the UE-ASL-A with the UE-ASL-B in step 442. Update ASL in. The UE-B 410 also compares the UE-ASL-A with the UE-ASL-B in step 448 and updates the ASL in step 450. In steps 446 and 452, the UE-A and the UE-B notify each user of the updated ASL to notify that the CSI service is available.

Next, a case of using CS signaling for message exchange between UE-A and UE-B will be described. Here, UE-A exchanges service information with UE-B using a NOTIFY message. The NOTIFY message is a message according to No.7 signaling. It is a message used to convey specific information to a partner without affecting an ongoing call during a CS call, and is transmitted in one direction. In a preferred embodiment of the present invention, 'CSI validity information' is added to the notification description so that service information can be added to the NOTIFY message.

6 illustrates a NOTIFY message used in an embodiment of the present invention. As shown, for the notification detail field included in the NOTIFY message, 7-bit bit combinations '0000000', respectively indicating user suspended, user resumed, and bearer change. , '0000001' and '0000010' are defined. Bits indicating CSI available can use any bit combination except bit combinations used for other purposes, and are denoted as 'xxxxxxx'.

The NOTIFY message may indicate various kinds of information accompanying the [available service] as well as the [available service]. For example, in the case of a CSI service, information such as 'CSI capable' as well as 'CSI-384 kbps capable' may be included in the notification description.

7 is a flowchart illustrating CS signaling according to the first embodiment of the present invention. UE-A 700 uses CS Domain-A 702 when using a CS call and IMS Core-A 704 when using an IMS call. Similarly, UE-B 710 uses CS Domain-B 708 when using a CS call and IMS Core-B 706 when using an IMS call. Here, the NOTIFY message is an Integrated Services Digital Network (ISDN) User Part (ISP), which uses a FAR (Facility Request message) and a FAA (Facility Accepted message).

As illustrated, in step 712, the UE-A 700 and the UE-B 710 are only performing voice calls using the CS call. In step 714, the UE-A 700 performs a handover to a region where CSI service is available (for example, a UTRAN region), and in step 716, the UE-A 700 includes a UE-ASL-A including CSI valid information. Update In this case, the UE-A 700 determines to exchange messages with the UE-B 710 through CS signaling.

In operation 718, the NOTIFY message including the UE-ASL-A sent by the UE-A 700 is delivered to the CS domain-A 702. In step 720, the CS domain-A 702 transfers the UE-ASL-A included in the NOTIFY message to the CS domain-B 708 by including it in a User to User Information (UUI) field of the FAR message. In step 722, the CS domain-B 708 transfers the FAR message to the UE-B 719 by including the NOTIFY message. After updating the UE-ASL-A in step 724, the UE-B 710 updates the UE-ASL-A to the UE-A 700 by including the UE-ASL-B in a NOTIFY message in step 726. In step 728, the CS domain-B 708 transfers the UE-ASL-B included in the NOTIFY message received from the UE-B 710 to the CS domain-A 702 by including it in the UUI field of the FAA message. . In operation 730, the CS domain-A 702 transmits the NOTIFY message to the UE-A 700.

The UE-A 700 receiving the NOTIFY message updates the UE-ASL-B in operation 732, compares the UE-ASL-A with the UE-ASL-B in operation 734, and updates the ASL in operation 736. do. If the UE-A 700 is not registered in the IMS Core-A 604, the UE-A 700 performs IMS registration with the IMS Core-A 704 in step 738. The UE-B 710 also compares the UE-ASL-A with the UE-ASL-B in operation 742 and updates the ASL in operation 744. In steps 740 and 746, the UE-A and the UE-B notify each user of the updated ASL to notify that the CSI service is available.

In FIG. 7, each UE may periodically transmit an OPTIONS message or an OPTIONS + message to trace the state of the other party. In the case of the CSI service, when a UE in the UTRAN region hands over to the plane GERAN region, it is possible to determine whether the user has moved to an unserviceable region by transmitting and receiving the OPTIONS message or OPTIONS + message. That is, each UE tracks the status of the other party through periodic OPTIONS / OPTONS + messages. For example, if UE-A sends an OPTION / OPTION + message but there is no response from UE-B, UE-A may know that UE-B has handed over to the CSI unavailable area.

<< 2nd Example >>

The second embodiment discloses a method of exchanging ASLs when exchanging service information.

8 is a diagram of UE-A notifying each user of UE Available Services List (UE-ASL) when an event occurs to UE-A making a connection with UE-B according to the second embodiment of the present invention. A flow chart showing the operation.

As shown, there is a connection of UE-A and UE-B in step 800. If an event occurs in UE-A in step 802, UE-A determines whether there is a state change in step 804. If there is no state change (803), the UE-A returns to step 802 for monitoring whether an event has occurred. If there is a state change (805), in step 806 UE-A confirms the change of the UE-ASL-A according to the state change, and updates the UE-ASL-A. In step 808, the UE-A compares the pre-stored UE-ASL-B with the updated UE-ASL-A. In step 810, the UE-A determines whether there is a change in ASL according to the comparison result. Since there is a change in the ASL (811), the UE-A updates the ASL in step 812. If there is no change in the ASL, the UE-A returns to step 802 for monitoring whether an event has occurred. If there is no pre-stored UE-ASL-B, the UE-A may proceed with the [Service Information Notification] procedure as shown in the first embodiment.

In step 814, the UE-A determines the message exchange method as IMS signaling or CS signaling to send the ASL to the UE-B, and performs a related procedure. A detailed procedure of message exchange according to the CS signaling will be shown in FIGS. 11 and 12, and a detailed procedure of message exchange according to the IMS signaling will be shown in FIG. 10. In step 816, the UE-A transmits the ASL to the UE-B, and informs the user of the ASL in step 820. In step 718, the UE-A may receive an acknowledgment that the ASL has been normally received from the UE-B. The connection of step 800 is maintained while the above steps are in progress.

9 is a flowchart illustrating the operation of UE-B according to the second embodiment of the present invention.

As shown in FIG. 900, there is a connection between UE-A and UE-B. In operation 902, the UE-B receives the ASL from the UE-A, updates the previously stored ASL according to the received ASL in operation 904, and then informs the user of the updated ASL in operation 908 (508). In step 906, the UE-B may transmit an Ack message indicating that the ASL is normally received to the UE-A. Likewise, while the above steps are in progress, the connection of step 902 is maintained.

10 is a flowchart illustrating IMS signaling according to a second embodiment of the present invention. Here, instead of comparing the UE-ASL received by each UE, the UE where the event occurred transmits the changed ASL to the counterpart UE. UE-A 1000 and UE-B 1010 may use CSI service, UE-A 1000 uses CS domain-A 1002 when using a CS call, and IMS Core-A (when using IMS call). 1004). Similarly, UE-B 1010 uses CS domain-B 1008 when using a CS call and IMS Core-B 1006 when using an IMS call.

As illustrated, in step 1012, the UE-A 1000 and the UE-B 1010 perform only a voice call using a CS call. In step 1014, the UE-A 1000 performs handover to an area (eg, a UTRAN area) where CSI service is available. In step 1016, the UE-A 1000 updates the UE-ASL-A to include CSI valid information. In step 1018, the UE-A 1000 compares the UE-ASL-A with the pre-stored UE-ASL-B, and updates the ASL according to the comparison result in step 1020. In operation 1022, the UE-A 1000 performs IMS registration with the IMS Core-A 1004 if necessary. In step 1124, the UE-A 1000 transmits the updated ASL to the UE-B 1010 using the OPTIONS + message. The format of the OPTION + message is as shown in FIG. 5 mentioned above. In the present embodiment, it is assumed that the ASL contains only CSI valid information. Then, the ASL and CSI valid information are the same.

In steps 1026 and 1028, the OPTION + message arrives at the UE-B 1010 via the IMS Core-B 1006. In step 1030, the UE-B 1010 updates the ASL according to the OPTION + message, and sends a 200OK message as an acknowledgment that the ASL has been normally received in steps 1032, 1034, and 1036. In steps 1038 and 1040, the UE-A 1000 and the UE-B 1010 inform each user of the updated ASL.

In FIG. 10, each UE may periodically transmit an OPTIONS message or an OPTIONS + message to trace the state of the other party. In the case of the CSI service, when a UE in the UTRAN region hands over to the plane GERAN region, it is possible to determine whether the user has moved to an unserviceable region by transmitting and receiving the OPTIONS message or OPTIONS + message.

11 is a flowchart illustrating CS signaling according to a second embodiment of the present invention. Here, the UE-A 1100 and the UE-B 1110 may use CSI services, and the UE-A 1100 uses the CS domain-A 1102 when using a CS call, and an IMS core-A when using an IMS call. (1104) is used. Similarly, UE-B 1110 uses CS Domain-B 1108 when using a CS call and IMS Core-B 1106 when using an IMS call. The NOTIFY message is an ISUP, using FAR and FAA.

As illustrated, in step 1112, the UE-A 1100 and the UE-B 1110 are only performing voice calls using a CS call. In step 1114, the UE-A 1100 performs a handover to an area (eg, a UTRAN area) where CSI service is available. In step 1116, the UE-A 1100 updates the UE-ASL-A to include CSI valid information. In step 1118, the UE-A 1100 compares the UE-ASL-A with a pre-stored UE-ASL-B, and updates the ASL according to the comparison result in step 1120. In step 1122, the UE-A 1100 delivers the updated ASL to the UE-B 1110 using a NOTIFY message. The format of the NOTIFY message is as shown in FIG. In the present embodiment, it is assumed that the ASL contains only CSI valid information. Then, the ASL and CSI valid information are the same.

In step 1124, the CS domain-A 1102 transmits the CSI valid information included in the NOTIFY message to the CS domain-B 1108 by putting the CSI valid information in the UUI field of the FAR message. In step 1126, the CS domain-B 1108 transfers the CSI valid information included in the FAR message to the UE-B 1110 in a NOTIFY message. In step 1128, the UE-B 1110 updates the previously stored ASL according to the CSI valid information included in the NOTIFY message, and then, in step 1130, the UE-B 1110 updates the NOTIFY message including the CSI valid information in the CS domain-B 1108. To send).

In step 1132, the CS domain-B 1108 transmits the CSI validity information included in the NOTIFY message to the CS domain-A 1102 in the UUI field of the FAA message. In step 1134, the CS domain-A 1102 transfers the CSI validity information included in the FAA message to the UE-A 1100 in a NOTIFY message. In step 1136, the UE-A performs IMS registration with the IMS Core-A 1104, if necessary. Thereafter, in steps 1138 and 1140, the UE-A 1100 and the UE-B 1110 notify each user of the updated ASL to notify that the CSI service is available.

12 is a flowchart illustrating CS signaling according to another example of the second embodiment of the present invention. Here, the UE-A 1200 and the UE-B 1210 may use CSI services, and the UE-A 1200 uses the CS domain-A 1202 when using a CS call, and an IMS core-A when using an IMS call. (1204). Similarly, UE-B 1210 uses CS Domain-B 1208 when using a CS call and IMS Core-B 1206 when using an IMS call. Here, the NOTIFY message is an ISUP and uses a user-to-user information message (USR). That is, FIG. 12 illustrates [service information notification] when the ISUP message transferring the NOTIFY message between the CS domain-A 1202 and the CS domain-B 1208 is USR, unlike FIG. 11.

In order to use the USR message, the CSR needs to exchange information with the other party that the USR message is to be used during the call setup. The call setup process (step 1212 to step 1222) included in FIG. 12 includes an operation of exchanging the above-mentioned information. Specifically, it is as follows.

In step 1212, the UE-A 1200 sets USR indication [USR indication] indicating that the USR message is to be used in the SETUP message for setting up the CS call and sends it to the UE-B 1210. In step 1214, the CS domain-A 1202 to which the UE-A 1200 is connected sends an IAM message including the USR indication information to the CS domain-B 1208 to which the UE-B 1210 is connected. . In step 1216, the CS domain-B 1208 sends a SETUP message including the USR indication information to the UE-B 1210, and the UE-B 1210 sends the USR indication information to the UE-A 1200. Save it. In step 1218, the UE-B 1210 transmits the USR indication information to the UE-A 1200 by including the CONNECT message. The CS domain-B 1208 includes the USR indication information in an ANM (Answer Message) message and sends it to the CS domain-A 1202. In step 1222, the CS domain-A 1202 sends the USR indication information to the CONNECT message. Including to send to the UE-A (1200).

If the call setup is made as described above, the UE-A 1200 and the UE-B 1210 perform only a voice call using a CS call in step 1224. In step 1226, the UE-A 1200 performs a handover to a region where a CSI service is available (for example, a UTRAN region). In step 1228, the UE-A 1200 updates the UE-ASL-A to include CSI valid information. In step 1230, the UE-A 1200 compares the UE-ASL-A with a pre-stored UE-ASL-B, and in step 1232, updates the ASL according to the comparison result. In step 1234, the UE-A 1200 delivers the updated ASL to the UE-B 1210 using a NOTIFY message. The format of the NOTIFY message is as shown in FIG. In the present embodiment, it is assumed that the ASL contains only CSI valid information. Then, the ASL and CSI valid information are the same.

In step 1236, the CS domain-A 1202 transmits the CSI valid information included in the NOTIFY message to the CS domain-B 1208 by putting the CSI valid information in the UUI field of the USR message. In step 1238, the CS domain-B 1208 transfers the CSI validity information included in the USR message to the UE-B 1210 in a NOTIFY message. In step 1240, the UE-B 1210 updates the previously stored ASL according to the CSI valid information included in the NOTIFY message, and then, in step 1242, the UE-B 1210 updates the NOTIFY message including the CSI valid information in the CS domain-B 1208. To send).

In step 1244, the CS domain-B 1208 transmits the CSI validity information included in the NOTIFY message to the CS domain-A 1202 in the UUI field of the USR message. In step 1246, the CS domain-A 1202 transfers the CSI validity information included in the USR message to the UE-A 1200 in a NOTIFY message. In step 1248, the UE-A performs IMS registration with the IMS Core-A 1204, if necessary. Thereafter, in steps 1250 and 1252, the UE-A 1200 and the UE-B 1210 notify each user of the updated ASL to notify that the CSI service is available.

13 is a diagram illustrating an apparatus of a UE according to a preferred embodiment of the present invention.

As shown, the UE includes an event checker 1300, a service information extractor 1302, a service information storage 1304, an ASL determiner 1306, a message exchanger 1308, and a user notification unit 1310. Consists of

The event check unit 1300 determines whether an event occurs in the UE. The service information extracting unit 1302 checks the UE-ASL, that is, its US-ASL (UE-ASL-A) and its counterpart UE-ASL (UE-ASL-B), and if necessary, the event checking unit 1300. The UE-ASL-A is updated according to the event identified by). The service information storage unit 1304 stores and manages service information such as ASL, UE-ASL, and UE-SSL described above. The ASL determination unit 1306 compares the UE-ASLs stored in the service information storage unit 1304 to determine whether there is a change in the ASL, and if there is a change in the ASL, stored in the service information storage unit 1304. Update the ASL.

The message exchange unit 1308 exchanges service information with a counterpart entity participating in call connection. In more detail, the message exchanger 1308 determines a message exchange method and exchanges the updated UE-ASL or updated ASL with the counterpart entity through the above-described procedure. If the ASL is updated, the user notifier 1310 notifies the user of the updated ASL to inform that the CSI service is possible. The user notification unit 1310 expresses that the ASL has been updated in a manner that the user can recognize, such as an image (for example, text on a terminal display, an image, an icon, etc.), audio (for example, voice notification), and vibration.

14 is a diagram showing a network device according to a preferred embodiment of the present invention. The network device shown here refers to any entity through which a message transmitted by UE-A or UE-B passes through the network, for example, a mobile switching center (MSC) or an IMS core of a CS domain. There is a Call Session Control Function (CSCF). As illustrated, the network device includes a connection setting unit 1400, a service information receiving unit 1402, and a service information transmitting unit 1404.

The connection setting unit 1400 performs a process in which the own terminal establishes a connection with a counterpart terminal (for example, any entity). The service information receiver 1402 receives service information sent from the user or the UE to the counterpart terminal, that is, updated UE-ASL or updated ASL. The received service information is transmitted by the service information transmitting unit 1404 to the counterpart terminal participating in the connection with the UE.

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 defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

When the state change occurs to each UE making a call connection, the present invention notifies each user so that which service is available due to the change. Through such notification, there are more opportunities for using various services on the user side, and there is an advantage that more opportunities for providing various services to users on the service provider side.

Claims (42)

A method of notifying service information changed according to a state change of a terminal UE-A in a wireless communication system, Establishing a connection with a UE-B and using a service using the connection; Updating an available service list (UE-ASL-A) of the UE (UE-A) according to the state change when an event causing a state change occurs during the connection; Transmitting the UE-ASL-A to the counterpart terminal; Obtaining a usable service list (UE-ASL-B) of the counterpart terminal; Comparing the UE-ASL-A with the UE-ASL-B and updating a service list (ASL) indicating services that can be used in common; Notifying the user of the updated ASL while maintaining the connection. The method of claim 1, wherein the transmitting of the UE-ASL-A comprises: And using Internet Protocol Multimedia Subsystem (IMS) signaling using an OPTIONS message according to Session Initiation Protocol (SIP). The method of claim 1, wherein the transmitting of the UE-ASL-A comprises: And using circuit switched signal (CS) signaling using a NOTIFY message according to an ISDN user part. The method of claim 1, wherein the obtaining of the UE-ASL-B comprises: The method as claimed in claim 1, wherein the UE-ASL-B is stored in the UE-A. The method of claim 1, wherein the obtaining of the UE-ASL-B comprises: And receiving the UE-ASL-B from the UE-B. In the method of receiving a service information changed in accordance with the state change of the terminal (UE-A) of the terminal (UE-B) in a wireless communication system, Establishing a connection with a UE-A and using a service using the connection; Receiving an available service list (UE-ASL-A) of the counterpart terminal updated according to a state change of the counterpart terminal during the connection; Comparing the UE-ASL-A with the available service list (UE-ASL-B) of the terminal and updating a service list (ASL) indicating services available in common; Notifying the user of the updated ASL while maintaining the connection. The method of claim 6, further comprising transmitting the UE-ASL-B to the counterpart terminal after receiving the UE-ASL-A. The method of claim 6, wherein the receiving of the UE-ASL-A comprises: The method using IMS signaling using an OPTIONS message according to Session Initiation Protocol (SIP). The method of claim 6, wherein the receiving of the UE-ASL-A comprises: Using CS signaling using a NOTIFY message according to ISUP. A method for notifying service information changed according to a state change of a terminal in a network device of a wireless communication system, Establishing a connection between terminals through the network device and providing a service using the connection; As an event causing a state change occurs in one of the UEs UE-A, an available service list UE-ASL-A of the UE-A updated according to the state change is generated from the UE-A. Receiving process, And transmitting the received UE-ASL-A to a counterpart network device that is connected to a counterpart terminal (UE-B) of the UE-A. The method of claim 10, wherein the receiving and the transmitting step, The method using IMS signaling using an OPTIONS message according to Session Initiation Protocol (SIP). The method of claim 10, wherein the receiving and the transmitting step, Using CS signaling using a NOTIFY message according to ISUP. An apparatus for notifying service information changed according to a state change of a terminal (UE-A) in a wireless communication system, An event confirmation unit configured to establish a connection with a UE-B and monitor whether an event causing a state change occurs while using a service using the connection; Stores an available service list (UE-ASL-A) of the UE (UE-A), an available service list (UE-ASL-B) of the counterpart terminal, and a service list (ASL) indicating jointly available services. A service information storage unit, A service information extracting unit configured to update the UE-ASL-A stored in the service information storage unit and to output the updated UE-ASL-A and the UE-ASL-B when it is determined that the event has occurred; , An ASL determination unit for updating the ASL by comparing the updated UE-ASL-A and the UE-ASL-B output from the service information storage unit; A message exchange unit for transmitting the updated UE-ASL-A to the counterpart terminal; And a user notification unit for notifying the user of the updated ASL while maintaining the connection. The method of claim 13, wherein the message exchange unit, The device according to claim 1, characterized by using Internet Protocol Multimedia Subsystem (IMS) signaling using an OPTIONS message according to Session Initiation Protocol (SIP). The method of claim 13, wherein the message exchange unit, And using circuit switched signal (CS) signaling using a NOTIFY message according to an ISDN user part. The method of claim 13, wherein the ASL determination unit, And the UE-ASL-B previously stored in the service information storage unit. The method of claim 13, wherein the ASL determination unit, And the UE-ASL-B is received from the UE-B by the message exchanger. In the apparatus for receiving the service information changed in accordance with the state change of the UE-A terminal (UE-B) in a wireless communication system, A message for receiving a service list (UE-ASL-A) of the counterpart terminal updated according to the state change of the counterpart terminal while establishing a connection with the counterpart UE-A and using the service using the connection. With exchange, An ASL determination unit for comparing the UE-ASL-A with the available service list (UE-ASL-B) of the terminal and updating a service list (ASL) indicating services available in common; And a user notification unit for notifying the user of the updated ASL while maintaining the connection. The method of claim 18, wherein the message exchange unit, And transmitting the UE-ASL-B to the counterpart terminal after receiving the UE-ASL-A. The method of claim 18, wherein the message exchange unit, Said IMS signaling using OPTIONS message according to Session Initiation Protocol (SIP). The method of claim 18, wherein the message exchange unit, And using CS signaling using a NOTIFY message according to ISUP. An apparatus for notifying service information changed according to a state change of a terminal in a network apparatus of a wireless communication system, A connection setting unit for establishing a connection between terminals through the network device and providing a service using the connection; As an event causing a state change occurs in one of the UEs UE-A, an available service list UE-ASL-A of the UE-A updated according to the state change is generated from the UE-A. Receiving service information receiving unit, And a service information transmitter configured to transmit the received UE-ASL-A to a counterpart network device that is connected to a counterpart terminal (UE-B) of the UE-A. The method of claim 22, wherein the service information receiving unit and the service information transmitting unit, Said IMS signaling using OPTIONS message according to Session Initiation Protocol (SIP). The method of claim 22, wherein the service information receiving unit and the service information transmitting unit, And using CS signaling using a NOTIFY message according to ISUP. A method of notifying service information changed according to a state change of a terminal UE-A in a wireless communication system, Establishing a connection with a UE-B and using a service using the connection; Updating an available service list (UE-ASL-A) of the UE (UE-A) according to the state change when an event causing a state change occurs during the connection; Comparing the available service list (UE-ASL-B) of the counterpart terminal previously stored with the updated UE-ASL-A; If there is a change in the ASL according to the comparison result, updating the ASL; Transmitting the updated ASL to the counterpart terminal; Notifying the user of the updated ASL while maintaining the connection. The method of claim 25, wherein the transmitting of the updated ASL comprises: The method using IMS signaling using an OPTIONS message according to Session Initiation Protocol (SIP). The method of claim 25, wherein the transmitting of the updated ASL comprises: Using CS signaling using a NOTIFY message according to ISUP. In the method of receiving a service information changed in accordance with the state change of the terminal (UE-A) of the terminal (UE-B) in a wireless communication system, Establishing a connection with a UE-A and using a service using the connection; Receiving a service list (ASL) indicating jointly available services updated according to a state change of the counterpart terminal during the connection; Notifying the user of the updated ASL while maintaining the connection. The method of claim 28, wherein receiving the ASL comprises: The method using IMS signaling using an OPTIONS message according to Session Initiation Protocol (SIP). The method of claim 28, wherein receiving the ASL comprises: Using CS signaling using a NOTIFY message according to ISUP. A method of notifying service information changed in accordance with a state change of a terminal in a network device of a wireless communication system, Establishing a connection between terminals through the network device and providing a service using the connection; As an event causing a state change occurs in one of the UEs, UE-A and UE-B, which are updated according to the state change, may be used jointly. Receiving a service list (ASL) indicating services from the UE-A; And transmitting the received ASL to a counterpart network device connected to the counterpart terminal (UE-B). 32. The method of claim 31, wherein the receiving and transmitting are: The method using IMS signaling using an OPTIONS message according to Session Initiation Protocol (SIP). 32. The method of claim 31, wherein the receiving and transmitting are: Using CS signaling using a NOTIFY message according to ISUP. An apparatus for notifying service information changed according to a state change of a terminal (UE-A) in a wireless communication system, An event confirmation unit configured to establish a connection with a UE-B and monitor whether an event causing a state change occurs while using a service using the connection; Stores an available service list (UE-ASL-A) of the UE (UE-A), an available service list (UE-ASL-B) of the counterpart terminal, and a service list (ASL) indicating jointly available services. A service information storage unit, A service information extraction unit configured to update the UE-ASL-A stored in the service information storage unit and output the updated UE-ASL-A and the UE-ASL-B when it is determined that the event has occurred; An ASL determination unit for updating the ASL by comparing the updated UE-ASL-A and the UE-ASL-B output from the service information storage unit; A message exchange unit for transmitting the updated ASL to the counterpart terminal; And a user notification unit for notifying the user of the updated ASL while maintaining the connection. The method of claim 34, wherein the message exchange unit, Said IMS signaling using OPTIONS message according to Session Initiation Protocol (SIP). The method of claim 34, wherein the message exchange unit, And using CS signaling using a NOTIFY message according to ISUP. An apparatus for receiving a service information changed in accordance with a state change of a UE-A by a UE-B in a wireless communication system, A connection setting part which establishes a connection with a counterpart terminal (UE-A) and uses a service using the connection; A message exchange unit which receives a service list (ASL) indicating jointly available services updated according to a change of state of the counterpart terminal during the connection; And a user notification unit for notifying the user of the updated ASL while maintaining the connection. The method of claim 37, wherein the message exchange unit, Said IMS signaling using OPTIONS message according to Session Initiation Protocol (SIP). The method of claim 37, wherein the message exchange unit, And using CS signaling using a NOTIFY message according to ISUP. An apparatus for notifying service information changed according to a state change of a terminal in a network apparatus of a wireless communication system, A connection setting unit for establishing a connection between terminals and providing a service using the connection; As an event causing a state change occurs in one of the UEs UE-A, the UE-A and the UE-B of the UE-A, which are updated according to the state change, are jointly used. A service information receiver for receiving a service list (ASL) indicating available services from the UE-A; And a service information transmitter for transmitting the received ASL to a counterpart network device connected to the counterpart terminal (UE-B). 41. The apparatus of claim 40, wherein the service information receiver and the service information transmitter, Said IMS signaling using OPTIONS message according to Session Initiation Protocol (SIP). 41. The apparatus of claim 40, wherein the service information receiver and the service information transmitter, And using CS signaling using a NOTIFY message according to ISUP.

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