KR20040100330A - Method for providing multimedia broadcast/multicast service in mobile communication system - Google Patents

Abstract

The present invention proposes a method for providing an MBMS service in a mobile communication system. To this end, the signaling process for MBMS service is divided into a process before receiving a NOTIFICATION message and an operation after receiving a NOTIFICATION message. The mobile terminal located in the service exclusion area is performed before receiving the NOTIFICATION message, and the mobile terminal moving from the service exclusion area to the service providing area is performed after receiving the NOTIFICATION message. This is to ensure that the MBMS service is normally performed even for the mobile terminal moving from the service exclusion area to the service providing area after the transmission of the NOTIFICATION message.

Description

METHOD FOR PROVIDING MULTIMEDIA BROADCAST / MULTICAST SERVICE IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a multicast multimedia broadcasting service method in a mobile communication system, and more particularly, to a method for providing control information for a multicast multimedia broadcasting service to a mobile terminal.

Today, due to the development of the telecommunications industry, the services provided by Code Division Multiple Access (CDMA) mobile communication systems are not only voice services, but also packet data and circuit data. It is evolving into a multicasting multimedia communication that transmits a large amount of data. Accordingly, in order to support the multicasting multimedia communication, a broadcast / multicast service that provides a service from one data source to a plurality of user equipments (hereinafter referred to as UE) is provided. ) Is being actively developed. The broadcast / multicast service is a message-oriented cell broadcast service (hereinafter referred to as "CBS") and a multicast multimedia broadcast service that supports multimedia forms such as real-time video, audio, still images, and text. (MBMS: Multimedia Broadcast / Multicast Service, hereinafter referred to as "MBMS").

The CBS service is a service that broadcasts a plurality of messages to all UEs located in a specific service area. In this case, the specific service area may be an entire area where the CBS service is provided in one cell.

The MBMS service generally refers to a service for transmitting the same multimedia data to a plurality of UEs through a wireless network. Since the MBMS service provides voice data and video data at the same time, a large amount of transmission resources are required. As such, in view of the possibility that a large number of services can be deployed simultaneously in one cell, the MBMS service is serviced through a broadcast channel. Thus, multiple UEs receiving MBMS service from the same base station (hereinafter referred to as "Node B") can share a radio channel, thereby saving radio resources.

1 is a diagram illustrating an example of a typical mobile communication network for an MBMS service. FIG. 1 illustrates an example of applying an MBMS service to a mobile communication system proposed by 3GPP, which is a standard for 3G asynchronous mobile communication.

Referring to FIG. 1, UEs 161, 162, 163, 171, and 172 are terminal devices capable of receiving MBMS service. The first cell (Cell 1) 160 and the second cell (Cell 2) 170 are service areas divided by one Node B or two different Node Bs. The UEs 161, 162, 163, 171, and 172 are located in a cell region of any one of the cells 160 and 170. The first cell 160 transmits relevant MBMS data for the MBMS service to the UEs 161, 162, and 163, and the second cell 170 sends the MBMS to the UEs 171, 172. Send the relevant MBMS data for the service. In this case, only one radio channel for the MBMS service is configured between the first cell 160 and the UEs 161, 162, and 163, and between the second cell 170 and the UEs 171 and 172. do. The radio network controller (hereinafter referred to as "RNC") 140 refers to a base station controller that controls the plurality of cells 160 and 170. The RNC 140 selectively transmits the MBMS data to specific cells 160 and 170 of the plurality of cells, and controls a radio channel configured to provide the MBMS service. The radio channel indicates a radio resource established between the cells 160 and 170 and the UEs 161, 162, 163, 171 and 171 for the MBMS service. A UMTS Radio Access Network (hereinafter referred to as "UTRAN") is the first and second cells 160 and 170 according to the service area of the RNC 140 and Node Bs controlled by the RNC 140. It consists of. The UTRAN serves to connect the UEs 161, 162, 163, 171, and 172 with a core network (hereinafter referred to as "CN").

A service packet radio service support node (SGSN: Serving GPRS Support Node, hereinafter referred to as "SGSN") 130 performs control related to MBMS service for each of the UEs 161, 162, 163, 171, and 172. . Representative examples include a role of managing service charging related data of each of the UEs 161, 162, 163, 171, and 172, and selectively transmitting MBMS data to a specific RNC. Although not shown in the drawing, a home location register (HLR) is connected to the SGSN 130 to perform a function of authenticating each of the UEs 161, 162, 163, 171, and 172.

Transit N / W 120 is between a Broadcast / Multicast Service Center (BM-SC) (hereinafter referred to as "BM-SC") 110 and the SGSN 130. It means a network that exists. The transport network 120 delivers a stream for the MBMS service received from the BM-SC 110 to the SGSN 130. Here, the transport network 120 may be configured with a Gateway Packet Radio Service Support Node (GGSN) (hereinafter referred to as "GGSN") and an external network.

The BM-SC 110 is a source for providing an MBMS stream. The BM-SC 110 schedules and streams a stream for an MBMS service to the transport network 120.

Referring to the above-described configuration, the MBMS data supplied from the BM-SC 110 is provided to the SGSN 130 through the transmission network 120, and the SGSN 130 sends the MBMS data to the RNC 140. To pass. At this time, the RNC 140 to which the MBMS data is delivered is limited to a specific RNC for which a corresponding MBMS service is requested. The RNC 140 delivers the MBMS data to cells 160 and 170 via Node Bs. At this time, the Node Bs to which the MBMS data is delivered are limited to the specific Node B to which the MBMS service is requested, and the cells 160 and 170 to which the MBMS data is transmitted are also limited to the specific cell to which the MBMS service is requested. The Node B managing the first cell 160 provides the MBMS data to the UEs 161, 162, and 163 located in the first cell 160 and requesting the corresponding MBMS service. The Node B managing the second cell 170 provides the MBMS data to the UEs 171 and 172 located in the second cell 170 and requesting the corresponding MBMS service.

1 shows a structure in which one RNC is connected to one SGSN for one MBMS service, but a plurality of SGSNs and a plurality of RNCs may exist for each of the SGSNs. In addition, a plurality of Node Bs may have a structure connected to each of the plurality of RNCs. In this structure, it is possible for one SGSN to selectively transmit MBMS data for multiple RNCs or one RNC to selectively transmit MBMS data for multiple Node Bs. To this end, the SGSNs and the RNCs must manage a list of nodes to which MBMS data is to be delivered. For example, each of the SGSNs manages a list of RNCs to transmit MBMS data, and each of the RNCs manages a list of Node Bs to transmit MBMS data.

2 is a diagram illustrating a signal flow for providing an MBMS service between a UE and a network in a mobile communication system.

Referring to FIG. 2, a service guide for transmitting basic information about MBMS services currently provided by SGSN, for example, menu information, MBMS service identifier, and service availability, to UEs in step 200. The ANNOUNCEMENT process is performed. Here, the menu information is information indicating time information, duration, and the like, when a specific MBMS service is started. The SGSN may broadcast the menu information through preset service areas (broadcast service such as CBS) or transmit only to UEs having a MBMS service request. The SGSN informs the MBMS Service ID of the MBMS service to differentiate and distinguish each MBMS service through the menu information.

A JOINING procedure (step 210) is performed between the UE to receive a particular MBMS service among the UEs notified of the menu information through the service guide process and the SGSN. For the connection procedure, the UE sends a service request message for requesting a specific MBMS service to the SGSN. The SGSN confirms the availability of the specific MBMS service to the UE through a process such as authentication and notifies the UE of the availability. Here, the service request message transmitted by the UE to the SGSN includes an MBMS service identifier indicating the selected MBMS service and a UE identifier indicating the corresponding UE. Meanwhile, the SGSN stores a list of UEs that want to receive a specific MBMS service and location information of the UEs through the aforementioned connection procedure.

Then, when the BM-CS is notified that the specific MBMS service will start soon, the SGSN transmits a SESSION START message indicating that the specific MBMS service is started to RNCs where UEs requesting the specific MBMS service are located (215). step). The RNCs in which the UEs are located may be identified by location information stored in the connection procedure. Receiving the SESSION START message, the RNC transmits a NOTIFICATION message for calling UEs to receive the specific MBMS service through a common channel. A second common control channel may be used as a common channel for transmitting the NOTIFICATION message. The calling process performed in step 220 uses an existing calling method or a group paging method. The group calling method has a meaning in contrast to the existing calling method and indicates a method of calling a plurality of UEs by transmitting a single NOTIFICATION message. The procedure performed in step 215 and step 220 is referred to as a "service notification procedure".

The UE, which detects that the requested MBMS service will be started soon through the service notification procedure, transmits a NOTIFICATION RESPONSE message to the RNC in response to the NOTIFICATION message in step 230. In response, the RNC sends a response message in response to the SESSION START message to the SGSN. The procedure made in step 220 is referred to as a "response procedure". The RNC determines the number of UEs to receive the specific MBMS service for each cell in step 230 and determines the type of radio channel to be used in the cell based on the number of UEs. For example, for a cell in which the number of UEs that want to receive the specific MBMS service is larger than a predetermined reference value, a common channel is determined as a radio channel for providing the specific MBMS service. However, for a cell in which the number of UEs that want to receive the specific MBMS service is smaller than a predetermined reference value, a dedicated channel is determined as a radio channel for providing the specific MBMS service. If the dedicated channel is determined as a radio channel for providing the specific MBMS service, a dedicated channel should be allocated to each of all UEs that want to receive the specific MBMS service. The above-described response procedure may proceed with a control message exchange between the RNC and a UE that wants to receive the specific MBMS service or a control message exchange between the SGSN and UEs that want to receive the specific MBMS service.

When the radio channel is determined as described above, a radio resource for actually providing the specific MBMS service is actually allocated between the RNC and the UE through a radio resource allocation procedure. In the radio resource allocation procedure, the RNC transmits MBMS Radio Bearer Information (hereinafter, referred to as "MBMS RB information") to which the specific MBMS service is to be transmitted in a corresponding cell to UEs to which the RNC wants to receive the specific MBMS service. Informing (hereinafter referred to as "radio bearer setup" step) and transport bearer information to be configured on an Iub interface to cells where UEs to receive the specific MBMS service are located and wirelessly It is divided into a step of notifying bearer information (hereinafter referred to as a "radio link setup" step). The MBMS RB information is transmitted through an MBMS Control Channel (hereinafter referred to as "MCCH"). The MBMS RB information is radio channel information to which the specific MBMS service is to be provided. For example, OVSF code information, transmission format information, radio link control (hereinafter referred to as "RLC") information, packet data convergence control (Packet Data Convergence Control, hereinafter referred to as "PDCP") information and the like. A detailed description of the above information is described in "3GPP TS 25.331" in the 3GPP standard. One MCCH to which control information related to the MBMS service is transmitted is configured per cell and is transmitted through a common channel such as S-CCPCH. Meanwhile, the UE may obtain information on the MCCH configured for each cell as system information.

When the radio resource allocation process is completed, all UEs that want to receive the specific MBMS service are aware of radio link related information to be provided with the specific MBMS service and higher layer information to be processed, and the cells to which the UE belongs. Complete the wireless link and Iub interface setup.

In the state where preparation for providing an MBMS service between the RNC and UEs is completed, the SGSN performs an MBMS data transmission process of transmitting MBMS data according to the specific MBMS service to the UEs through the RNC (step 240). ).

The above general description of the MBMS service assumes that all cells receive a specific MBMS service. However, a plurality of cells belonging to one RNC may be divided into a cell that provides a specific MBMS service and a cell that does not. Hereinafter, a cell in which the specific MBMS service is provided is referred to as an "In Service Area", and a cell in which the specific MBMS service is not provided is referred to as an "out of service area". The OOS area and the IS area are defined for each MBMS service provided.

Looking specifically at providing the MBMS service by dividing the OOS area and the IS area, an operator providing a specific MBMS service may decide not to provide a specific MBMS service for a specific cell due to any reason. . In this case, the specific cell becomes an OOS region. For example, when a user who uses a voice service statistically has many cells or a plurality of cells overlapping each other, some of them may be set as an OOS area.

3 illustrates an example of setting an OOS area and an IS area in a mobile communication network.

Referring to the MBMS service procedure in the mobile communication network in which the OOS region exists with reference to FIG. 3, the SGSN 300 includes a list of cells belonging to the OOS region in the SESSION START message 305 and transmits it to the RNC 310. . Thereafter, the RNC 310 performs a differential signaling procedure for cells belonging to the OOS region and cells belonging to the IS region. For example, the RNC 310 may not perform any operation related to the corresponding MBMS service for cells belonging to the OOS region 320. Any operation related to the MBMS service may be a NOTIFICATION message transmission, MBMS RB information transmission, MBMS data transmission, and the like, as described above with reference to FIG. 2. However, if a NOTIFICATION message is not unilaterally transmitted for cells belonging to the OOS region, serious problems may occur.

Hereinafter, a problem that may be caused by not unilaterally transmitting a NOTIFICATION message for cells belonging to the OOS region will be described with reference to FIG. 4.

In FIG. 4, it is assumed that cell A 400 is a cell belonging to an OOS region, and cell B 410 is assumed to be a cell belonging to an IS region. In addition, the UE 405 located in the cell A waits to receive a NOTIFICATION message after performing a connection procedure to receive a specific MBMS service, and assumes that the RNC receives a SESSION START message from SGSN at this point.

When the RNC receives the SESSION START message, the RNC transmits a NOTIFICATION message only to cells belonging to an IS region among cells controlled by the RNC. Accordingly, the NOTIFICATION message is transmitted to the cell B 410 belonging to the IS region, and the NOTIFICATION message is not transmitted to the cell A 400 belonging to the OOS region. Therefore, at the time point when the NOTIFICATION message is transmitted, the UE 405 located in the cell A 400 cannot receive the NOTIFICATION message. Meanwhile, even when the specific MBMS service is started, the RNC transmits MBMS data according to the MBMS service only to the cell B 410 belonging to the OOS region.

After a certain time has elapsed from when the NOTIFICATION message was transmitted, the UE 405 may move from the cell A 400 to the cell B 410. In this case, since the UE 405 has moved to the cell B 410 belonging to the IS region, it should be able to receive a desired MBMS service. However, since the UE 405 does not know that the MBMS service that it wants to receive has been started, the UE 405 cannot take the necessary operation to receive the MBMS data according to the MBMS service, and as a result, the MBMS service is not provided. There is a problem.

An operation required for receiving MBMS data according to the MBMS service is as follows. The first operation should determine whether the desired MBMS service is provided to the moved cell, and the second operation should request the MBMS service if the desired MBMS service is not provided.

The first operation may be performed by receiving the MCCH in the corresponding cell. However, the UE 405 does not receive the MCCH until the specific MBMS service is started. That is, the NOTIFICATION message plays a role similar to that of the MCCH reception indicator. In other words, the UE 405 does not perform the operation for receiving the MCCH before receiving the NOTIFICATION message, and performs the operation for receiving the MCCH only after receiving the NOTIFICATION message.

For this reason, the UE located in the OOS region does not receive the NOTIFICATION message even though the MBMS service is started, and thus does not perform the operation for receiving the MCCH, and thus cannot receive the desired MBMS service. A problem arises.

Accordingly, an object of the present invention for solving the above problems is to propose a method for providing a desired MBMS service for a mobile terminal located in a service exclusion area.

Another object of the present invention is to provide a method for notifying a desired MBMS service is started for a cell belonging to a service excluded area.

It is still another object of the present invention to provide a method for transmitting a notification message including service excluded region identification information to a mobile terminal located in a cell belonging to a service excluded region.

It is still another object of the present invention to provide a method for achieving a desired MBMS service for a mobile terminal moving from a service excluded area to a service providing area.

In a first aspect to achieve the above object, the present invention provides a wireless network controller, SGSN for providing a specific MBMS service to the wireless network controller, a plurality of cells connected to the wireless network controller, In the mobile communication system including a plurality of mobile terminals located in the cells, the plurality of cells are divided into cells belonging to the service exclusion area for the specific MBMS service and cells belonging to the service providing area to provide the specific MBMS service. The method for notifying the specific MBMS service is started for each cell by the radio network controller, the method comprising: service cells for providing the specific MBMS service from the SGSN and service exclusion cells belonging to the service excluded area among the service cells; Receiving information and excluding current service for the service excluding cells Transmitting a notification message for setting information indicating the location of the station; and transmitting a notification message for setting information indicating the location of the current service provision area for the remaining cells except the non-service cells of the service cells. Characterized by including the process.

In a second aspect for achieving the above object, the present invention provides a wireless network controller, a SGSN for providing a specific MBMS service to the wireless network controller, a plurality of cells connected to the wireless network controller, In the mobile communication system including a plurality of mobile terminals located in the cells, the plurality of cells are divided into cells belonging to the service exclusion area for the specific MBMS service and cells belonging to the service providing area to provide the specific MBMS service. In the method for the mobile terminal to receive the specific MBMS service, Receive a notification message transmitted for each cell corresponding to the specific MBMS service from the wireless network controller, and the service exclusion area identification information set in the notification message Determining whether the cell to which the cell belongs is an out-of-service area by Checking the reception time of the notification message for the specific MBMS service through monitoring of the pilot channel when the mobile station is excluded from the control channel; and moving the control channel based on the common channel information provided as system information from the wireless network controller when moving to a new cell. And receiving radio bearer information for receiving the specific MBMS service.

In a third aspect for achieving the above object, the present invention provides a wireless network controller, a SGSN for providing a specific MBMS service to the wireless network controller, a plurality of cells connected to the wireless network controller, In the mobile communication system including a plurality of mobile terminals located in the cells, the plurality of cells are divided into cells belonging to the service exclusion area for the specific MBMS service and cells belonging to the service providing area to provide the specific MBMS service. In the SGSN providing the specific MBMS service, transmitting information on service cells to provide the specific MBMS service and information on service excluded cells belonging to the service excluded area among the service cells to the radio network controller; And the specific MBMS service request is received from a mobile terminal of an idle situation moved to a new cell. When it is characterized by determining whether said new cell belonging to the exclusion, the service, and comprising the step that the new cell belongs to the exclusion zone indicating that the service is located in the area except the current service to the mobile terminal.

1 illustrates an example of a typical mobile communication network for MBMS services.

2 is a diagram illustrating a signal flow for providing an MBMS service between a mobile terminal and a network in a mobile communication system.

3 is a diagram illustrating an example of setting a service excluding area and a service providing area in a mobile communication network.

FIG. 4 is a diagram for explaining a problem that may be caused by not unilaterally transmitting a NOTIFICATION message for cells belonging to a conventional service exclusion area.

5 is a diagram illustrating signaling for performing a call procedure in a mobile communication network according to an embodiment of the present invention.

6 is a diagram illustrating a signaling procedure performed in a mobile communication network by moving an idle mode mobile terminal located in a service excluded area to a new cell according to an embodiment of the present invention.

7 is a diagram illustrating a signaling procedure performed in a mobile communication network by moving a mobile terminal in a URA_PCH state, a CELL_PCH state, and a CELL_FACH state to a new cell according to an embodiment of the present invention.

8 is a view showing a control flow showing the operation of a mobile terminal according to an embodiment of the present invention.

9 is a diagram illustrating an operation when a mobile terminal connected to a specific MBMS service moves to a new cell according to an embodiment of the present invention.

10 is a diagram illustrating an operation in a wireless network controller according to an exemplary embodiment of the present invention.

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

DETAILED DESCRIPTION In the following detailed description, one representative embodiment of the present invention is set forth in order to achieve the above technical problem. And other embodiments that can be presented with the present invention are replaced by the description in the configuration of the present invention.

In the present invention to be described later, the RNC inserts and transmits an OOS region identifier (hereinafter referred to as "OOS identification information") in a NOTIFICATION message, and the operation of the UE will be described in detail. The operation of the UE according to the present invention may be divided into a first operation performed before receiving a NOTIFICATION message including OOS identification information and a second operation performed after receiving a NOTIFICATION message not including OOS identification information. In addition, in performing the first operation or the second operation, a specific operation of the UE may be further subdivided according to the current state of the UE. Table 1 and Table 2 below divide the current state of the UE into an idle state, URA_PCH state, CELL_PCH state, CELL_FACH state and CELL_DCH state. The idle state indicates a state in which the RRC connection is not established between the UE and the cell in which the UE is located. The URA_PCH state monitors the PCH for voice communication and reports the state to the RNC when the UE is moved to another URA. Indicates. At this time, the URA is larger than the general cell and is determined by the service operator. The CELL_PCH state indicates the fact that the PCC monitors the PCH for voice communication and reports the fact to the RNC when it moves to another cell. Indicates the status reported by. Finally, the CELL_DCH state represents a state having a dedicated wireless channel.

Table 1 below shows operations that can be subdivided according to the current state of the UE before receiving the NOTIFICATION message (Before Notification operations).

division action Idle mode UE Idle mode UE operation + PIF monitoring NOTIFICATION message reception time check operation URA_PCH UE URA_PCH UE operation + PIF monitoring NOTIFICATION message reception time check operation CELL_PCH UE CELL_PCH UE operation + PIF monitoring NOTIFICATION message reception time confirmation operation CELL_FACH UE CELL_FACH UE Behavior CELL_DCH UE CELL_DCH UE Behavior

In Table 1, idle mode UE operation, URA_PCH UE operation, CELL_PCH UE operation, CELL_FACH UE operation, and CELL_DCH UE operation are the same as those defined previously. The state-specific UE operations defined above are described in detail in the 3GPP standard "3GPP TS 25.331". Meanwhile, in order to implement the present invention, as shown in Table 1, the UE in the Idle mode state, the URA_PCH state, and the CELL_PCH state additionally performs an operation of confirming the timing of receiving a NOTIFICATION message through PICH monitoring.

To summarize the operations performed by the UE before receiving the NOTIFICATION message (Before Notification operations), UEs in the Cell_FACH state and the Cell_DCH state operate in the same manner as before. However, UEs in an idle state, Cell_PCH state, and URA_PCH state perform a PICH monitoring operation. The purpose of the PICH monitoring operation is to determine whether to send a NOTIFICATION message for a specific MBMS service, even if the UE is located in an OOS region, in addition to checking whether a normal call is made.

Table 2 below shows operations that can be subdivided according to the current state of the UE after receiving a NOTIFICATION message (After Notification operations).

division action Idle mode UE idle mode UE operation + MCCH reception operation URA_PCH UE URA_PCH UE Action + MCCH Receive Action CELL_PCH UE CELL_PCH UE Action + MCCH Receive Action CELL_FACH UE CELL_FACH UE operation + MCCH reception operation CELL_DCH UE CELL_DCH UE Behavior

In Table 2, idle mode UE operation, URA_PCH UE operation, CELL_PCH UE operation, CELL_FACH UE operation, and CELL_DCH UE operation are the same as those defined previously. The state-specific UE operations defined above are described in detail in the 3GPP standard "3GPP TS 25.331". Meanwhile, in order to implement the present invention, as shown in Table 2, the UE in the Idle mode state, URA_PCH state, CELL_PCH state, and CELL_FACH state additionally performs an operation of receiving the MCCH configured for each cell. As described above, the UE receives the MCCH as an operation after receiving the NOTIFICATION message in order to receive the desired MBMS service even when the UE located in the OOS region moves to the IS region.

In an example of allowing the UE to receive the MCCH, the MCCH is transmitted through a common channel configured for each cell by an RNC. To this end, the RNC announces the information on the common channel to which the MCCH is transmitted for each cell as system information. UEs wishing to receive the MCCH recognize the MCCH information (common channel information to which the MCCH is transmitted) in advance through the system information, and receive the MCCH using the previously recognized MCCH information as necessary. .

Hereinafter, an operation according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

5 is a diagram illustrating signaling for performing a call procedure in a mobile communication network according to an embodiment of the present invention.

Referring to FIG. 5, when the SGSN is notified of the start of a specific MBMS service from the BM-SC, the SGSN transmits a SESSION START message to the RNC in step 505. The SESSION START message may include an MBMS ID, a quality of service (QoS) information required for the MBMS service, a routing area (RA) list, and a service area information. The service region information includes a list of cells belonging to an OOS region for applying an embodiment of the present invention.

When the RNC receives the SESSION START message, the RNC transmits a NOTIFICATION message to the cells corresponding to the RAs included in the RA list in step 510. The NOTIFICATION message includes an MBMS ID, an OOS identifier, and the like. The RA is a collection of cells. The RNC may correspond to one or more RAs and recognize cells corresponding to a specific RA. The RA is described in detail in 3GPP TS 23.060, which is a standard of 3GPP. The OOS identifier is determined according to whether a cell to which the NOTIFICATION message is to be transmitted belongs to an OOS region. For example, the RNC transmits a NOTIFICATION message including an OOS identifier for indicating that the cell belongs to the OOS region belongs to the OOS region. In contrast, the RNC transmits a NOTIFICATION message including an OOS identifier for notifying that the cell belongs to the IS region for a cell not belonging to the OOS region. The OOS identifier may be represented as 1 bit. That is, "1 (true)" can be set for the OOS identifier for notifying that it belongs to the OOS area, and "0 (false)" for the OOS identifier for notifying that it belongs to the IS area.

Step 515 is a procedure performed by the UE located in the OOS region, and step 520 is a procedure performed by a UE located in the IS region. The UEs located in the OOS region receive a NOTIFICATION message in which the OOS identifier is set to "1" through step 510, and the UEs located in the IS region set NOTIFICATION in which the OOS identifier is set to "0" in step 510. You will receive a message.

In step 510, the UEs (UEs belonging to the OOS region) that have received the NOTIFICATION message with the OOS identifier set to "1" perform an operation before receiving the NOTIFICATION message shown in Table 1 below. To perform. That is, even if the UEs receive the NOTIFICATION message, the UEs do not perform an After Notification operation after receiving the NOTIFICATION message shown in Table 2 and move the After Notification operation to a new cell belonging to the IS region. Until until postponed.

On the contrary, after receiving the NOTIFICATION message in which the OOS identifier is set to "0" in step 510, UEs (UEs belonging to an IS region) operate after receiving the NOTIFICATION message shown in Table 2 below. Operation). At this time, if necessary, the UEs may transmit a response message corresponding to the NOTIFICATION message to the RNC.

FIG. 6 is a diagram illustrating a signaling procedure performed in a mobile communication network by moving an idle mode UE located in an OOS region to a new cell. 6 assumes that the UE has already received the NOTIFICATION message in the previous cell.

Referring to FIG. 6, when the idle mode UE located in the OOS region moves to a new cell in step 605, the After Notification operation, which was postponed when it is located in a cell belonging to the previous OOS region, starts. That is, it receives the MCCH and checks whether the desired MBMS service is provided in the new cell (step 610). If the desired MBMS service is provided in a new cell, the UE acquires MBMS RB information provided through the MCCH and then starts receiving MBMS data according to the desired MBMS service by the obtained MBMS RB information. However, if the desired MBMS service is not being provided in the new cell, the UE requests the desired MBMS service to the new cell.

Since the UE is operating in the idle mode, in step 615, the RRC connection is set. The RRC CONNECTION setting is started by the UE sending an RRC CONNECTION REQUEST message to the RNC, and the RNC sends an RRC CONNECTION SETUP message to the UE in response to the RRC CONNECTION REQUEST message. The UE completes the RRC CONNECTION setup by receiving the RRC CONNECTION SETUP message, setting the RRC CONNECTION, and then sending an RRC CONNECTION SETUP COMPLETE message to the RNC. Through this procedure, the idle mode UE transitions to the Cell_FACH or Cell_DCH state and is in a state capable of transmitting data in the reverse direction.

When the RRC CONNECTION configuration is completed, the UE transmits a SERVICE REQUEST message to SGSN through the RNC (620). The SERVICE REQUEST message may include an MBMS service identifier corresponding to the MBMS service that the UE wants to receive and an identifier of the UE. The SERVICE REQUEST message transmitted by the UE is delivered to the SGSN through the RNC. At this time, the RNC transmits the identifier of the cell where the UE is located.

When the SGSN receives the SERVICE REQUEST message, the SGSN determines whether the cell in which the UE is located belongs to an OOS region. If the SGSN determines that the cell in which the UE is located belongs to the OOS region, the SGSN sets an OOS identifier indicating that the UE is currently located in the OOS region in a SERVICE REJECT message and transmits it to the UE. In this case, the SERVICE REJECT message includes an MBMS service identifier corresponding to the MBMS service that the UE wants to receive. However, when the SGSN determines that the cell in which the UE is located belongs to an IS region, the SGSN performs a general procedure for providing an MBMS service requested by the UE.

If it is confirmed that the UE is located in the OOS region through the SERVICE REJECT message, the UE performs an operation before receiving the NOTIFICATION message shown in Table 1 below. That is, the UEs do not perform an After Notification operation after receiving the NOTIFICATION message shown in Table 2 and re-delay the After Notification operation until moving to a new cell belonging to the IS region.

FIG. 7 is a diagram illustrating a signaling procedure performed in a mobile communication network when a UE in a URA_PCH state, a CELL_PCH state, and a CELL_FACH state located in an OOS region moves to a new cell. It is assumed that the UE in FIG. 7 has already received the NOTIFICATION message in the previous cell.

Referring to FIG. 7, when a UE in a URA_PCH state, a CELL_PCH state, and a CELL_FACH state that has received a NOTIFICATION message in the OOS region in step 705 moves to a new cell, it postpones when it is located in a cell belonging to the previous OOS region. Start the action. That is, it receives the MCCH and checks whether the desired MBMS service is provided in the new cell (step 710). If the desired MBMS service is provided in a new cell, the UE acquires MBMS RB information provided through the MCCH and then starts receiving MBMS data according to the desired MBMS service by the obtained MBMS RB information. However, if the desired MBMS service is not being provided in the new cell, the UE requests the desired MBMS service to the new cell. Since the UE is operating in the URA_PCH state, the CELL_PCH state, and the CELL_FACH state, the RRC connection is already set. In step 715, it is assumed that the MBMS service request by the UE is made through a CELL UPDATE message. The CELL UPDATE message is typically a message used for updating cell information. When the CELL UPDATE message is used to request the MBMS service, the CELL UPDATE message should include an MBMS service identifier and service request information corresponding to the MBMS service that the UE wants to receive. The CELL UPDATE message is provided to the RNC.

When the RNC receives the CELL UPDATE message, the RNC checks the MBMS service identifier and service request information included in the CELL UPDATE message. The RNC then determines whether the cell in which the UE is located belongs to an OOS region. If it is determined that the cell in which the UE is located belongs to the OOS region, the RNC sets an OOS identifier indicating that the UE is currently located in the OOS region in a CELL UPDATE CONFIRM message and transmits it to the UE. In this case, the CELL UPDATE CONFIRM message may include an MBMS service identifier corresponding to the MBMS service that the UE wants to receive. However, when the RNC determines that the cell in which the UE is located belongs to an IS region, the RNC performs a general procedure for providing an MBMS service requested by the UE.

If it is confirmed that the UE is located in the OOS region through the CELL UPDATE CONFIRM message, the UE performs a before notification operation before receiving the NOTIFICATION message shown in Table 1. That is, the UEs do not perform an After Notification operation after receiving the NOTIFICATION message shown in Table 2 and re-delay the After Notification operation until moving to a new cell belonging to the IS region.

8 is a diagram illustrating a control flow showing operation of a UE according to an embodiment of the present invention.

Referring to FIG. 8, the UE proceeds to step 810 after receiving a notification message from the RNC in step 805. In step 810, the UE sets the relevant item of the MBMS started variable to "yes". The MBMS started variable is used to determine whether to perform a Before Notification operation or an After Notification operation after the UE moves to a new cell. Thereafter, the UE checks the OOS identifier set in the NOTIFICATION message, and determines in step 815 whether the UE is located in an OSS area based on the check result. If it is determined in step 815 that it is located in the OOS region, the flow proceeds to step 820. Otherwise, if it is determined that it is located in the IS area, the flow proceeds to step 825.

The UE proceeds to step 820 and performs the Before Notification operation shown in Table 1 below. However, if it proceeds to step 825, the UE performs the After Notification operation shown in Table 2.

The structure of the MBMS started variable set in step 810 is shown in Table 3 below.

MBMS started MBMS ID STATUS MBMS ID STATUS MBMS ID STATUS

The MBMS started variable having the structure shown in Table 3 is a variable for storing whether to start a service for each MBMS service. In Table 3, the MBMS ID is generated corresponding to the specific MBMS service while the UE performs the connection procedure for receiving the specific MBMS service. At this time, the STATUS indicating whether the MBMS service is started is set to "NO" because it is not before receiving the NOTIFICATION for the MBMS service. After receiving the NOTIFICATION message for the specific MBMS service, the UE sets the STATUS of the MBMS ID corresponding to the specific MBMS service to “YES” in the MBMS started variable. Each MBMS ID shown in Table 3 and the STATUS corresponding to each MBMS ID are removed when the UE releases a connection to the MBMS service. In Table 3, the STATUS is information for confirming whether a NOTIFICATION message is received for each MBMS service, that is, whether the corresponding MBMS service is started. Accordingly, when the UE later moves to another cell, the UE may determine whether to receive a NOTIFICATION message or an MCCH by checking the STATUS.

9 illustrates an operation when a UE connected to a specific MBMS service moves to a new cell according to an embodiment of the present invention.

Referring to FIG. 9, in step 905, the UE moves to a new cell and proceeds to step 910. In step 910, the UE checks the MBMS started variable shown in Table 3 to determine the STATUS for each MBMS service. If there is an MBMS service whose STATUS is set to “YES” among the MBMS services stored in the MBMS started variable, the UE proceeds to step 915. Otherwise, if there is no MBMS service whose STATUS is set to "YES" among the MBMS services stored in the MBMS started variable, the process proceeds to step 920. The absence of the MBMS service with the STATUS set to "YES" means that the UE has not received a NOTIFICATION message corresponding to the MBMS service that the UE wants to receive from the previous cell. In contrast, the presence of the MBMS service with the STATUS set to "YES" means that the UE has received a NOTIFICATION message corresponding to the MBMS service that the UE wants to receive from the previous cell.

If the UE proceeds to step 915, the UE performs the After Notification operation shown in Table 2, and if proceeds to step 920, the UE performs the Before Notification operation shown in Table 1. The After Notification operation refers to an operation of acquiring MBMS RB information of an MBMS service started by receiving an MCCH of a newly moved cell.

10 is a diagram illustrating an operation in an RNC according to an embodiment of the present invention.

10, the RNC receives a SESSION START message from SGSN in step 1000 and proceeds to step 1005. The RNC determines cells to transmit a NOTIFICATION message in step 1005. Cells for transmitting the NOTIFICATION message may be determined as cells included in RA information included in the SESSION START message.

When the cells to which the NOTIFICATION message is to be determined are determined, the RNC determines OOS identifiers corresponding to the cells and transmits NOTIFICATION messages in which the determined OOS identifiers are set for each cell.

To this end, the RNC determines whether the RNC belongs to an OOS region for each cell for transmitting the NOTIFICATION message in step 1010. The determination for each cell may be made by service area information included in the SESSION START message. The service area information is location information indicating whether each cell is located in an OOS area or an IS area.

If the RNC determines that the cell is located in the OOS region, the RNC proceeds to step 1015. The RNC proceeds to step 1015 and sets the OOS identifier corresponding to the corresponding cell to "true." Setting the OOS identifier to "true" is to indicate that the UE is located in the OOS area.

However, if the RNC determines that the corresponding cell is not located in the OOS region, the RNC proceeds to step 1020. Not being located in the OOS area may be interpreted as being located in the IS area. The RNC proceeds to step 1020 and sets the OOS identifier corresponding to the corresponding cell to "false." Setting the OOS identifier to "false" is to indicate that the UE is not located in the OOS area.

If the OOS identifier for each cell is set in steps 1015 and 1020, the RNC sets the set OOS identifier in the NOTIFICATION message and transmits the set OOS identifier to the corresponding cell in step 1025.

As described above, the present invention has the effect of improving the service satisfaction of the user by providing the desired MBMS service even for the mobile terminal moving from the service exclusion area to the service available area.

Claims (3)

A wireless network controller, an SGSN for providing a specific MBMS service to the wireless network controller, a plurality of cells connected to the wireless network controller, and a plurality of mobile terminals located in each of the cells; In a mobile communication system providing the specific MBMS service by dividing it into cells belonging to a service exclusion area and cells belonging to a service providing area for a specific MBMS service, the radio network controller notifies that the specific MBMS service is started for each cell. To Receiving, from the SGSN, service cells for providing the specific MBMS service and information regarding service excluded cells belonging to the service excluded area of the service cells; Transmitting a notification message for setting information indicating that the service excluded cells are located in a current service excluded area; And transmitting a notification message for setting information indicating that the remaining cells except for the non-service cells among the service cells are located in the current service providing area. A wireless network controller, an SGSN for providing a specific MBMS service to the wireless network controller, a plurality of cells connected to the wireless network controller, and a plurality of mobile terminals located in the respective cells, In the method for the mobile terminal to receive the specific MBMS service in a mobile communication system providing the specific MBMS service by dividing it into cells belonging to a service exclusion area for a specific MBMS service and cells belonging to a service providing area, Receiving a notification message transmitted for each cell in response to the specific MBMS service from the wireless network controller, and confirming whether a cell to which the cell belongs is a service excluded region by service exclusion region identification information set in the notification message; , Checking the reception time of the notification message for the specific MBMS service through monitoring of a pilot channel when the service is excluded from the service area; And moving to a new cell, receiving radio bearer information for receiving the specific MBMS service through a control channel based on common channel information provided as system information from the radio network controller. A wireless network controller, an SGSN for providing a specific MBMS service to the wireless network controller, a plurality of cells connected to the wireless network controller, and a plurality of mobile terminals located in each of the cells; In the method for providing the specific MBMS service by the SGSN in a mobile communication system for providing the specific MBMS service by dividing into cells belonging to the service exclusion area for the specific MBMS service and cells belonging to the service providing area, Transmitting information about service cells to provide the specific MBMS service and service excluded cells belonging to the service excluded area among the service cells to the wireless network controller; When the specific MBMS service request is received from the mobile terminal of the idle state moved to a new cell, it is determined whether the new cell belongs to the service excluded area, and if the new cell belongs to the excluded service area, the mobile terminal excludes the current service. And informing that the user is located in an area.