KR100790130B1 - Method for Indicating UE's Reception Session Receiving Of Session in Multimedia Broadcast/Multicast System - Google Patents

Abstract

The present invention relates to a multicast multimedia broadcasting service (MBMS service). According to the present invention, a serving radio network controller (SRNC) checks whether a terminal wants to receive a current session for a MBMS service subscribed to a terminal, and the SRNC is indifferent to a session for the MBMS service of the terminal according to the check result. Transmits information to a drift radio network controller (DRNC), wherein the DRNC includes the terminal in an MBMS context for the MBMS service, and counts the terminal in accordance with the session indifference information of the terminal in the counting for the MBMS service. Determine whether to exclude In this way, radio resources can be used more efficiently.

MBMS (Multimedia Multicast / Broadcast Service), Repeated Session (Frequency Layer Convergence), Counting, UE interest

Description

Method and system for transmitting / receiving session indifference information of UE in multimedia broadcasting / multicast service system {Method for Indicating UE's Reception Session Receiving Of Session in Multimedia Broadcast / Multicast System}

1 is a diagram illustrating a network configuration for a general multicast multimedia broadcasting service.

2 is a diagram illustrating a situation where SRNC and DRNC are different for a specific specific UE.

3 is a diagram illustrating a reception procedure of a general MBMS service.

4 is a diagram illustrating a case where two adjacent cells transmit the same service.

5 is a diagram illustrating a message flow between RNCs and UEs in a state other than CELL_DCH according to the first embodiment of the present invention.

6 is a diagram illustrating a message flow between RNCs and a UE in a CELL_DCH state according to a second embodiment of the present invention.

7 is a diagram showing the operation of the SRNC according to the first embodiment of the present invention;

8 illustrates the operation of an SRNC according to a second embodiment of the present invention;

9 is a flowchart showing the operation of the DRNC according to the first and second embodiments of the present invention.

Fig. 10 shows the operation of the third embodiment of the present invention.

11 is a diagram showing the operation of the SRNC according to the third embodiment of the present invention;

12 illustrates operation of a DRNC according to a third embodiment of the present alias.

The present invention relates to a multicast multimedia broadcasting service (hereinafter referred to as an MBMS), and in particular, an SRNC that detects when a UE moves to a new DRNC while a session is in progress indicates whether the UE receives a session. This is how you tell DRNC.

Due to the development of communication technology, the services provided by the mobile communication system using the Wideband Code Division Multiple Access (WCDMA) scheme are not only conventional voice services but also packets that transmit large amounts of data. It is developing into multimedia broadcasting / communication capable of transmitting service communication and multimedia service. Accordingly, in order to support the multimedia broadcasting / communication, an MBMS service that provides a service from one or more multimedia data sources to a plurality of user equipments (hereinafter referred to as 'UE') has been discussed.

The MBMS service refers to a service for transmitting the same multimedia data to multiple receivers through a wireless network. In this case, by allowing a plurality of receivers to share one radio channel, it is possible to save radio transmission resources. The MBMS service supports multimedia transmission forms such as real-time video, audio, still images, text, etc., and can provide voice data and video data simultaneously according to the multimedia transmission format. .

1 is a diagram schematically illustrating nodes participating in providing an MBMS service in a general mobile communication network. Here, a configuration example in which MBMS service is applied to 3GPP (3rd Generation Project Partnership) system, which is a standard of 3G asynchronous mobile communication based on Global System for Mobile Communications (GSM) and General Packet Radio Services (GPRS), is illustrated.

Referring to FIG. 1, UEs 161, 162, 163, 171, and 172 refer to terminal devices or subscribers capable of receiving MBMS services, and include cell 1 160 and cell 2 170. Denotes a physical or logical service area controlled by Node B, which is a base station for wirelessly transmitting MBMS-related data to subscribers. A radio network controller (hereinafter referred to as 'RNC') 140 is configured to control the plurality of cells 160 and 170 and to selectively transmit multimedia data to a specific cell and to provide MBMS services. Control the wireless channel. The connection between the RNC 140 and the UEs 161 to 172 is connected to a Radio Resource Control (RRC) interface.

The RNC 140 is a Packet Switched or Packet Service (hereinafter, referred to as 'PS') by a service packet radio service support node (hereinafter referred to as 'SGSN') 130. Connected to the network. Communication between the RNC 140 and the PS network is performed by packet switched signaling (PS signaling). In particular, the connection between the RNC 140 and the SGSN 130 is called an Iu-PS interface. SGSN 130 controls the MBMS-related services of each subscriber. Representative examples of the role played by the SGSN 130 include managing a service related data of each subscriber and selectively transmitting multimedia data to a specific RNC 140.

The Transit NW 120 provides a communication path between the Broadcast Multicast Service Center (hereinafter referred to as 'BM-SC') 110 and the SGSN 130, and provides a gateway packet radio. It may be connected to an external network through a gateway GPRS support node (hereinafter referred to as 'GGSN') (not shown). The BM-SC 110 is responsible for scheduling MBMS data as a source of MBMS data.

On the other hand, the RNC 140 is connected to a circuit switched (Circuit Switched (CS)) network by a Mobile Switching Center (hereinafter referred to as "MSC") 150. The CS network refers to a voice-based legacy communication network that is connection-based. Communication between the RNC 140 and the MSC 150 is performed by circuit switched signaling (CS signaling). In particular, the connection between the RNC 140 and the MSC 150 is called an Iu-CS interface.

The MBMS data stream generated from the BM-SC 110 is transmitted to the UEs 161, 162, 163 via the transport network 120, SGSN 130, RNC 140, Node B and cells 160, 170. , 171 and 172.

Although not shown in FIG. 1, there may be multiple SGSNs for one MBMS service and multiple RNCs for each SGSN. Each SGSN is a plurality of RNCs, each RNC performs a selective data transmission to each of a plurality of cells, and for this purpose a list of sub-nodes (i.e., SGSN list of RNCs, In this case, a list of cells) may be stored to selectively perform MBMS data transmission only to the stored nodes.

2 shows a situation in which SRNC and DRNC are different for a specific UE. That is, managing communication of UEs 311 to 314 in a mobile communication system consumes radio resources managed by the RNC2 303 because the RNC1 302 or actual UEs 311 to 314 are physically located. It shows the situation.

Referring to Figure 2, CN node 301 is a brief representation of nodes such as BM-SC, transport network, MSC, SGSN. The RNC1 302 and RNC2 303 are connected to the CN node 301, and the wired passage 331 connecting the CN node 301 and the RNCs 302 and 303 is an Iu interface, an RNC1 302 and an RNC2. The wired passage 332 connecting the 303 is called an Iur interface. In this case, the Node B existing between the RNC2 303 and the UEs 311 to 314 is omitted because the cells 321 to 323 directly manage the cells. Here, the RNC2 303 is referred to as a drift RNC (hereinafter referred to as DRNC) that directly manages the cells 321 to 323 where the UEs 311 to 314 are located, and the RNC1 311 to 314 is the UE. A serving RNC (hereinafter referred to as SRNC) that controls the communication of the fields 311 to 314 is called.

3 is a diagram illustrating a procedure between a subscriber station and a network for an MBMS service. Here, the BM-SC 206 communicates with the UE 202 via the RNC 204. The RNC 204 also communicates with the BM-SC 206 via SGSN (not shown). Although only one RNC 204 and only one UE 202 are shown here, the same procedure is of course applicable to multiple UEs and multiple RNCs wishing to receive MBMS service.

Referring to FIG. 3, a service registration (SUBSCRIPTION) step 210 is a process in which a user who wants to receive MBMS service, that is, a UE 202, registers with a BM-SC 206 which is a service provider. At this time, the BM-SC 206 and the UE 202 exchange basic information related to charging or service reception.

In the service announcement (ANNOUNCEMENT) step 220, the UEs grasp basic information about the MBMS service. For example, service identifiers (MBMS IDs) for identifying MBMS services that can be provided by the BM-SC 206, service start time, and duration are recognized. Here, the MBMS ID is composed of a multicast address and an access point name (hereinafter, referred to as 'APN'). Nodes located between the BM-SC 206 and the UE 202 at the service announcement 220, that is, the RNC 204, SGSN, transport network, etc., are connected to the UE 202 and the UE. Recognize nodes that are connected to 202. For example, the SGSN grasps a list of UEs that want to receive the MBMS service and a list of RNCs in which the UEs are located, and transmits MBMS data only to RNCs in which the UEs are located later with reference to the lists. .

The UE 202 having acquired the basic MBMS service information as described above performs a JOINING step 230 to receive desired MBMS service data. In this case, the UE 202 transmits at least one desired MBMS ID among the MBMS IDs obtained through the service announcement 220 to the BM-SC 206.

The NOTIFICATION step 340 is to call the UE 202 to inform that the MBMS service requested by the UE 202 will start soon. That is, group paging is performed for a plurality of UEs joining the MBMS service.

RADIO RESOURCE ALLOCATION step 250 actually allocates radio resources between the UE 202 and the RNC 204 to provide the MBMS service and announces the information to related nodes. Here, the RNC 204 is based on information on the number of UEs belonging to each of the lower cells and a radio resource management function (RaRM) function. PTM ') or one-to-one transmission mode (Point-to-Point).

In the data transfer step 260, actual MBMS data is transmitted to the UE 202 through the RNC 204. In this case, when there is a need to change information on the MBMS service, for example, a ciphering key, the RNC 204 transmits a new encryption key to all UEs receiving the MBMS service.

When the MBMS service is terminated, the allocated radio resource is released in step RADIO RESOURCE RELEASE 270, and the UE 202 is notified that the MBMS radio resource is released. Although not shown, the UE 202 may voluntarily stop receiving the MBMS service and stop receiving the MBMS service while receiving the MBMS service in step 250.

The RNC manages an MBMS context in which information about UEs to receive a service is collected for each MBMS service. One MBMS service consists of several sessions. The MBMS context is managed until the end of the service, or until no UE receives service under the RNC, regardless of the start and end of the session, and whether or not to send the session to the PTP or PTM when a new session starts. This is determined by considering the number of UEs included. This process of counting the number of UEs is called a counting process.

4 illustrates a situation in which the same MBMS service is transmitted in cell 1 401 and cell 2 402. As shown in the figure, the same session may appear repeatedly for the MBMS service and this is called a 'repeated session'. In this repeated session situation, if the UE has already received the same session, the RNC can use the radio resource more efficiently by excluding the UE from counting.

Although the SRNC knows that the UE has already received the session in such a repetitive transmission situation, when the UE moves to another cell managed by the DRNC, as indicated at 450, the DRNC includes the UE in counting. In this case, a service that may be serviced by PTP may be set to PTM because of a UE that does not receive an actual session, which causes a waste of radio resources.

An object of the present invention for solving the above problems is to provide a method and apparatus for notifying the DRNC by checking whether the SRNC receives the actual session of the UE when the UE moves to the target cell managed by the DRNC.

Another object of the present invention is to provide a method and apparatus for receiving a real session of a UE from an SRNC 'by using a radio resource more efficiently by not including the UE in counting.
A preferred embodiment of the present invention for achieving the above object is, in the multimedia broadcasting / multicast service (MBMS service) system, a method for transmitting session indifference information on the MBMS service of the terminal subscribed to the MBMS service The SRNC may be configured to determine, by the serving radio network controller (SRNC), whether the terminal desires to receive a current session for the MBMS service subscribed to by the terminal, and the SRNC is responsible for the MBMS service of the terminal according to the verification result. Transmitting session indifference information to a drift radio network controller (DRNC), wherein the DRNC includes the terminal in an MBMS context for the MBMS service and sends the terminal to the MBMS service according to the session indifference information of the terminal; Characterized in that it comprises a process of determining whether to exclude from the counting for.
In addition, the preferred embodiment of the present invention, in the MBMS system for providing a multimedia broadcasting / multicast service (MBMS service) to the terminal, indicating whether the terminal wants to receive the current session for the MBMS service subscribed to the terminal A serving radio network controller (SRNC) generating session indifferent information of the terminal and receiving the session indifference information of the terminal from the SRNC, and determining whether to exclude the terminal from counting for the MBMS service according to the session indifference information; It characterized in that it comprises a drift radio network controller (DRNC).

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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 is to provide 'session interest information' of the UE for a specific MBMS service from SRNC to DRNC. Here, the UE is indifferent to a particular MBMS session includes a case where the UE has already received the same session in a repeated transmission situation. In addition, the UE's interest in a particular MBMS session includes the case where it has never received the session before.

FIG. 5 is a message flow diagram when a UE in a situation other than CELL_Dedicated CHannel (ie, does not have a dedicated channel (DCH)) moves to another cell according to a preferred embodiment of the present invention.

Referring to FIG. 5, in step 510, when the UE 501 detects that the reception sensitivity of the neighbor cell is good, the UE 501 transmits a cell update message to the DRNC 502 controlling the neighbor cell. In step 520, the DRNC 502 delivers the cell update message to the SRNC 503 through an 'uplink signaling transfer' message.

After receiving the cell update message, the SRNC 503 checks whether the MBMS service subscribed to by the UE 501 is currently in progress in step 530, and if it is currently in progress, the UE 501 receives the current session of the MBMS service. Determine whether there is.

If the UE 501 is currently receiving a session, the SRNC 503 indicates that the UE 501 is not currently receiving a session in step 540, indicating that the UE 501 is not receiving a current session. Is not set, and the unset indifference indicator is included in the 'Downlink signaling transfer (DST)' message together with the service ID of the MBMS service. In this case, the non-interest indicator may be set not to include the indifference indicator in the DST message or to set the indifference indicator to N (No).

In addition, if the UE 501 subscribes to the service but is not receiving the current session, the UE 501 sets the 'non-interest indication' and includes it in the DST message together with the service ID. Here, the indifference indicator may be set by setting the indifference indicator to Y (Yes).
In FIG. 5, if the UE is interested in the MBMS service S1 and is indifferent to the MBMS service S2, in step 530, the SRNC sets an indifference indicator for S1 and an indifference indicator for S2. In step 540, the SRNC transmits the DST message to the DRNC.

In step 550, the DRNC 502 determines whether an indifference indicator is set for each MBMS service in the DST message. If the indifference indicator is set as a result of the checking, the UE 501 is included in the MBMS context and the UE 501 is excluded from counting. If the check result indicates that the indifference indicator is not set and only the service ID is included, the UE 501 is included in the MBMS context (for reference, the process of including the UE in the MBMS context is called 'Attach'). The UE 501 is included in the counting to determine the transfer mode of the MBMS service.

In step 560, the DRNC 502 transmits a 'cell update confirm' message to the UE 501. The 'cell update confirm' message may be transmitted after transmitting the 'uplink signaling transfer' message.

6 is a flowchart of a message when a UE in a CELL_DCH state, that is, having a dedicated channel, is moved to a cell managed by a DRNC according to a preferred embodiment of the present invention.

In step 610, the SRNC 603 determines to move the UE 601 to a cell managed by the new DRNC 602. In step 620, the SRNC 603 determines whether the UE 601 actually receives a session for an MBMS service.

If the UE 601 is actually receiving the current session as a result of the check, the SRNC 603 does not set an indifference indicator, which means that the UE 601 is not currently receiving the session. In addition, the uninterested indifference identifier and the service ID of the MBMS service are included in the 'Radio Link setup' message. However, if the UE 601 subscribes to the service but does not receive the current session, it sets the 'interest indicator' and includes it in the 'Radio Link setup' message together with the service ID.

In step 630, the SRNC 603 transmits the 'Radio Link setup' message to the DRNC 602.

In step 640, the DRNC 602 checks whether an 'interest indicator' is set for each MBMS service in the 'Radio Link setup' message. If the check result 'indifference indicator' is set, the UE 601 is included in the MBMS context and the UE is excluded from counting. If the check result indicates that the 'interest indicator' is not set and only the service ID is included, the UE 601 is included in the MBMS context and the UE is included in the counting for the MBMS service.

In step 650, the SRNC 603 transmits an 'Active set update' message to the UE 601 as a result of the step 610, thereby allowing the UE 601 to perform a handover.

5 to 6 illustrate whether the UE receives a current ongoing session included in a 'Downlink signaling transfer (hereinafter referred to as' DST ')' message or a 'Radio link setup' message transmitted from the SRNC to the DRNC. The 'interest indicator', which is the session reception information, has a form as shown in Tables 1 and 2 below.

<< first embodiment >>

Table 1 shows a case where a 1-bit identifier is used as an indifference indicator according to the first embodiment of the present invention.

That is, if the indifference indicator is set to '1', it indicates that the UE subscribes to the MBMS service but does not receive a session in progress. In addition, when the indifference indicator is set to '0', it means that the UE is currently receiving a session in progress. When using this 1-bit identifier, it is assumed that the transmission timing of the session coincides between the cell where the UE is initially located and the cell to be moved.

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<< 2nd Example >>

<Table 2> shows whether the UE receives a session corresponding to the session ID, including the session ID of the session currently being performed in the session establishment information of the UE, according to the second embodiment of the present invention. It shows how to inform the DRNC of the indifference indicator.
This method can be used even when the transmission timings of sessions do not match between cells, and DRNC can know whether the UE has received a corresponding session by using the session ID as an indifference indicator.

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7 is an example of an SRNC operation according to FIG. 5.

Referring to FIG. 7, in step 700, the SRNC receives a 'cell update' message from an uplink signaling transfer (UST) system. In step 710, the SRNC checks whether the 'cell update' message requires handover between RNCs.

In case of handover to the new RNC, the SRNC checks the number of MBMS services (n) subscribed to by the UE in step 720 and sets the index (i) to 0. In step 730, the SRNC checks that i is smaller than n. Judge. If i is greater than n, the determination proceeds to step 780. If i is less than n, steps 740 to 770 are repeated for all MBMS services subscribed to the UE.

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That is, in step 740, the SRNC checks whether the UE is interested in the current session of the i-th MBMS service. If the UE is interested in the current session as a result of the checking, the UE proceeds to step 755 to set an indifference indicator for the i-th MBMS service.

If it is confirmed that the UE subscribes to the i-th MBMS service but is not interested in the current session, an indifference indicator for the i-th MBMS service is set in step 760, and the service ID of the i-th MBMS service in the service list in step 770. And the indifference indicator, increase i by 1 and return to step 730.

After repeating steps 730 to 770 for all the services subscribed to by the UE, in step 780, the SRNC includes a service list of a type as shown in Table 1 or Table 2 in the DST message. The DST message is sent to the DRNC to complete the operation.

If the handover to the new DRNC is not performed as a result of the check in step 710, the SRNC proceeds to step 790 and transmits an existing DST message to the DRNC and ends the operation.

8 is an example of an SRNC operation according to FIG. 6.

Referring to FIG. 8, in step 800, the SRNC determines to handover a UE in a CELL_DCH state, and in step 810, the SRNC determines whether to handover to a new DRNC.

If it is determined that the handover to the new DRNC is to be performed, the process proceeds to step 820. Otherwise, the process proceeds to step 890, after which the existing 'Radio Link Setup' message is sent to the DRNC, and the operation ends.

In step 820, the SRNC checks the number of MBMS services (n) subscribed to by the UE and sets the index (i) to 0. In step 830, the SRNC determines whether i is smaller than n. If i is greater than n, the determination proceeds to step 880. If i is less than n, steps 840 to 870 are repeated for all MBMS services subscribed to the UE.

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That is, in step 840, the SRNC checks whether the UE is interested in the current session of the i-th MBMS service. If the UE determines that the UE is interested in the current session, that is, receiving the current session, the UE proceeds to step 855 and does not set an indifference indicator for the i-th MBMS service.

If it is determined that the UE is not interested in the current session, the UE has subscribed to the i-th MBMS service but is not interested in the current session, so in step 860, an indifference indicator for the i-th MBMS service is set; After setting the service ID and the indifference indicator of the i-th MBMS service in the list, i is increased by 1 and the process returns to step 830.

After repeating steps 830 to 870 for all the services subscribed to by the UE, in step 880, the SRNC includes a service list in the form of <Table 1> or <Table 2> in the 'Radio Link Setup' message. In step 790, the 'Radio Link Setup' is transmitted to the DRNC to complete the operation.

9 illustrates a DRNC operation according to the first and second exemplary embodiments of the present invention.

9, in operation 900, the DRNC receives a 'Downlink signaling transfer (DST)' or 'radio link setup' message for a specific UE from the SRNC, and in step 910, the received 'Downlink signaling transfer' or 'radio' Check whether the link setup 'message includes the service list such as <Table 1> or <Table 2>. If the check result does not include a service list, in step 980, the operation of the previously defined DRNC is performed.

If the check result is included in the service list, in step 920, the DRNC checks the number of MBMS services (n) subscribed to the UE and sets the index (i) to 0. Judge. If i is greater than n, the determination proceeds to step 980. If i is less than n, steps 940 to 970 are repeated for all MBMS services subscribed to the UE.

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That is, in step 940, the DRNC checks whether an indifference indicator is set for the i-th MBMS service included in the service list. If the indifference indicator is set for the i-th MBMS service, in step 960, the UE adds the UE to the MBMS context of the i-th MBMS service and determines the transmission mode of the i-th MBMS service. Exclude from counting.

If it is determined that the indifference indicator is not set for the i-th MBMS service, in step 950, the UE is added to the MBMS context of the i-th MBMS service and the UE is included in the counting for the i-th MBMS service. Let's do it.

In operation 980, the DRNC performs all operations included in the service list in operation 930 to 970, and performs an existing operation according to a 'downlink signaling transfer' or 'radio link setup' message and ends the operation.

<< third embodiment >>

The third embodiment of the present invention informs whether the UE is indifferent to one of the one or more MBMS services to which the UE subscribes or a session of the services, regardless of the mobility of the UE.

10 is a flowchart according to a third embodiment of the present invention. Here, the UE subscribes to MBMS services S1 and S2.

Referring to FIG. 10, in step 1010, an 'MBMS Modification Request' message including indifference information about MBMS services is received from the UE 1001, and in step 1020, the SRNC 1003 subscribes to the UE 1001. Check whether there is interest in current session of each MBMS service. In FIG. 10, a case where the UE 1001 is indifferent to S2 is taken as an example.

In step 1030, the SRNC 1003 transmits indifference information indicating that the UE 1001 is indifferent to S2 in the message 'MBMS Session Delinking Indication' to the DRNC 1002.

Table 3 below is an example of an MBMS Session Delinking Indication message according to a third embodiment of the present invention.

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As shown in Table 3, the 'MBMS Session Delinking Indication' message must include at least one Temporary MBMS Group Identify (TMGI), which is an MBMS service identifier, so that the UE 1001 subscribes but does not receive services. It informs the DRNC 1002 of the MBMS Bearer Service list, which is indifference information. In addition, by including the current session ID in the MBMS Bearer Service list, it transmits whether the UE receives the current session for each MBMS service.

In step 1040, the DRNC 1002 does not perform counting including the UE on MBMS services included in the MBMS Bearer Service list included in the received MBMS Session Delinking Indication message.

11 is a flowchart illustrating the operation of the SRNC according to the third embodiment of the present invention.

Referring to FIG. 11, in step 1100, an SRNC that receives a UE from the UE through a command such as an MBMS Modification Request from the UE is not interested in a current session of a specific MBMS service. n) and the index (i) is set to 0. In step 1120, the SRNC determines whether i is less than n. If the i is greater than n, the process proceeds to step 1170. If the i is less than n, steps 1130 to 1160 are repeated for all MBMS services subscribed to the UE.
That is, in step 1130, the SRNC checks the context of the i-th MBMS service, and in step 1140, the SRNC checks whether the UE is interested in the i-th MBMS service. If the check result is not interested in the i-th MBMS service, the service ID and session ID of the i-th MBMS service are included in the MBMS Bearer Service list in step 1150, and i is increased by 1 in step 1160, and then in step 1120. Return to. On the other hand, if the UE is interested in the i-th MBMS service, the process proceeds directly to step 1160.

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In step 1170, the SRNC includes the MBMS Bearer Service list configured as described above in the 'MBMS Session Delinking Indication' message, and in step 1180, the SRNC includes the MBMS Bearer Service list. The Delinking Indication 'message is sent to the DRNC.

12 is a flowchart illustrating a DRNC operation according to a third embodiment of the present invention.

Referring to FIG. 12, in step 1200, the DRNC receives an 'MBMS Session Delinking Indication' message including an 'MBMS bearer Service list' for a specific UE from the SRNC. In step 1210, the DRNC checks the number of MBMS services (n) included in the 'MBMS bearer Service list' and sets the index (i) to zero. In operation 1120, the SRNC determines whether i is smaller than n. If i is greater than n as a result of the determination, it ends. If i is less than n, steps 1230 to 1240 are repeated for all MBMS services subscribed to the UE.
That is, in step 1230, the DRNC excludes the UE from counting for determining a transmission mode of the i-th MBMS service included in the 'MBMS bearer Service list', and in step 1240, increases i by 1 and then, in step 1220 Return to.

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 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.

According to the present invention, when a UE moves to a cell managed by a new RNC, the SRNC determines whether the UE is interested in a session and informs the DRNC, and the DRNC that recognizes that the UE is indifferent to the session does not include the UE in counting. As a result, it is possible to use radio resources more efficiently. In other words, regardless of the mobility of the UE, the present invention informs the DRNC whether a session of an ongoing service is received with respect to the services subscribed to the UE, thereby enabling the use of radio resources more efficiently.

Claims (13)

In a multimedia broadcasting / multicast service (MBMS service) system, a method for transmitting session indifference information about the MBMS service of a terminal subscribed to the MBMS service, A serving radio network controller (SRNC) checking whether the terminal wants to receive a current session for the MBMS service subscribed to by the terminal; Transmitting, by the SRNC, session indifference information on the MBMS service of the terminal according to the confirmation result to a drift radio network controller (DRNC); And the DRNC includes the terminal in the MBMS context for the MBMS service and determines whether to exclude the terminal from counting for the MBMS service according to the session indifference information of the terminal. Service method. The method of claim 1, Prior to the above confirmation process, The SRNC further comprises the step of receiving a cell update request from the terminal through the DRNC. The method of claim 1, Prior to the above confirmation process, The SRNC further comprises the step of receiving the session indifference information on the MBMS service from the terminal. The method of claim 1, The session indifference information, MBMS service method comprising the indifference indicator indicating that the terminal does not want to receive the current session and the service ID of the MBMS service. The method of claim 4, wherein The transmitting process, Set the indifference indicator if the terminal is receiving the current session for the MBMS service, and set the indifference indicator if it is not receiving the current session for the MBMS service, And transmitting the indifference indicator to the DRNC along with the service ID of the MBMS service. The method of claim 4, wherein The determining process, If the indifference indicator is set, the terminal is excluded from the counting for the MBMS service, if the indifference indicator is not set, MBMS service method characterized in that to include the terminal in the counting for the MBMS service. The method of claim 4, wherein And displaying the indifference indicator as a 1-bit identifier when the session transmission timing between the cell located before the mobile station and the cell located after the mobile station coincides. In the MBMS system for providing a multimedia broadcasting / multicast service (MBMS service) to the terminal, A serving radio network controller (SRNC) for generating session indifference information of the terminal indicating whether the terminal wants to receive a current session for the MBMS service subscribed to by the terminal; And a drift radio network controller (DRNC) for receiving session indifference information of the terminal from the SRNC and determining whether to exclude the terminal from counting for the MBMS service according to the session indifference information. The method of claim 8, The SRNC, And receiving a cell update request from the terminal through the DRNC and generating session indifference information of the terminal. The method of claim 8, The DRNC, MBMS system, characterized in that whether the terminal receives the current session through the session indifferent information received from the terminal. The method of claim 8, The session indifference information, And an indifference indicator indicating that the terminal does not want to receive the current session and a service ID of the MBMS service. The method of claim 11, The SRNC, Set the indifference indicator if the terminal is receiving the current session, set the indifference indicator if it is not receiving the current session, And transmit the indifference indicator to the DRNC along with the service ID of the MBMS service. The method of claim 11, The DRNC, And remove the terminal from the counting for the MBMS service when the indifference indicator is set, and include the terminal in the counting for the MBMS service when the indifference indicator is set.

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