JP2008527904A - Method and system for transmitting / receiving terminal session indifference instruction information in multimedia broadcast / multicast service system - Google Patents

Abstract

  The present invention is a method for transmitting session indifference indication information for an MBMS service of a terminal in a multimedia broadcast / multicast service (MBMS) system, wherein a serving radio network controller (SRNC) is configured for an MBMS service subscribed by the terminal. Determining whether or not the terminal wishes to receive the current session, and according to the determination result, the SRNC transmits session indifference indication information for the MBMS service of the terminal to the drift radio network controller (DRNC) And DRNC includes including the terminal in the MBMS context for the MBMS service, and determining whether to exclude the terminal from counting for the MBMS service according to the session indifference indication information of the terminal. .

Description

  The present invention relates to a multimedia broadcast / multicast service (hereinafter referred to as “MBMS”) system, and in particular, a UE (User Equipment) is a new drift radio network controller during a session. When a movement to (Drift Radio Network Controller: DRNC) is detected, a serving radio network controller (SRNC) relates to a method of notifying the DRNC whether or not the UE session has been received. Is.

  Recently, with the development of communication technology, services provided in mobile communication systems using Wideband Code Division Multiple Access (hereinafter referred to as “WCDMA”) systems are not limited to conventional voice services. Developed in multimedia broadcasting / communication, which can support packet services and multimedia services used for large-capacity data transmission. In order to support multimedia broadcasting / communication, MBMS services that provide services to one or more UEs from one or more multimedia data sources have been discussed.

  Here, the “MBMS service” refers to a service for transmitting the same multimedia data to a plurality of recipients through a wireless network. This MBMS service can save radio transmission resources by allowing a plurality of recipients to share one radio channel. This MBMS service supports multimedia transmission such as real-time video and audio, still images, and characters, and can simultaneously provide audio data and video data through multimedia transmission. For this reason, this MBMS service requires a large amount of transmission resources.

FIG. 1 schematically illustrates nodes participating in providing an MBMS service in a typical mobile communication network. Here, for example based on GSM (Global System for Mobile Communications) and GPRS (General Packet Radio Services), MBMS service is applied to the standard and is 3GPP (3 ^rd Generation Project Partnership) system of the third-generation asynchronous mobile communication system Assume that.

  Referring to FIG. 1, user terminals (UEs) 161, 162, 163, 171, and 172 are terminals or subscribers that can receive the MBMS service, and the first cell 160 and the second cell 170 are subscribed. A base station that wirelessly transmits MBMS-related data to a user, that is, a Node B, and each indicates a physical or logical service area controlled by the Node B. A radio network controller (hereinafter referred to as “RNC”) 140 controls a plurality of cells 160 and 170 to selectively transmit multimedia data to a specific cell and provide an MBMS service. Control the radio channel set to. The RNC 140 and the UEs 161, 162, 163, 171, and 172 are connected by a radio resource control (Radio Resource Control: hereinafter referred to as “RRC”) interface.

  The RNC 140 is connected to a packet switching or packet service such as the Internet by an SGSN (Serving GPRS Support Node) 130. Communication between the RNC 140 and a PS (Packet Switched) network is performed by PS Signaling. In particular, the connection between the RNC 140 and the SGSN 130 is called an Iu-PS interface. The SGSN 130 controls each subscriber's MBMS related services. Examples of typical functions controlled by the SGSN 130 include a function for managing service charging related data of each subscriber and a function for selectively transmitting data to a specific RNC 140.

  A transit network 120 provides a communication path between a broadcast multicast service center (hereinafter referred to as “BM-SC”) 110 and an SGSN 130, and passes through a GGSN (Gateway GPRS Support Node) (not shown). Can be connected to an external network. The BM-SC 110 that is a source of MBMS data plays a role of scheduling MBMS data.

  The RNC 140 is connected to a circuit switched (CS) network by a mobile switching center (hereinafter referred to as “MSC”) 150. The CS network means a voice-centric existing communication network that is a connection base. Communication between the RNC 140 and the MSC 150 is performed by CS signaling. In particular, the connection between the RNC 140 and the MSC 150 is referred to as an Iu-CS interface.

  The MBMS data stream generated from the BM-SC 110 reaches the UEs 161, 162, 163, 171, and 172 through the relay network 120, the SGSN 130, the RNC 140, and the Node B or cells 160 and 170.

  Although not shown in FIG. 1, a plurality of SGSNs can be provided for one MBMS service, and a plurality of RNCs can be provided for each SGSN. Each SGSN selectively performs data transmission to a plurality of RNCs and each RNC to a plurality of cells. For this purpose, a list of lower nodes (for example, a list of RNCs and a list of cells, respectively) to which a data stream is to be transmitted to SGSN and RNC is stored, and MBMS data transmission is selectively performed only to the nodes included in this list. Carry out.

  FIG. 2 shows a situation where SRNC and DRNC are different for a specific UE. That is, FIG. 2 shows that in the mobile communication system, the first RNC 302 manages the communication of the UEs 311 to 314, but the physically located UEs 311 to 314 use radio resources actually managed by the second RNC 303. Indicates the situation to be performed.

  Referring to FIG. 2, a core network (CN) node 301 is a simplified representation of nodes such as BM-SC, relay network, MSC, and SGSN. The first and second RNCs 302 and 303 are both connected to the CN node 301. A wired route 331 for connecting the CN node 301 and the RNCs 302 and 303 is called an Iu interface, and a wired route 332 for connecting the first and second RNCs 302 and 303 is called an Iur interface. Here, the Node B located between the second RNC 303 and the UEs 311 to 314, which directly manages one or more cells, is omitted. The second RNC 303 is called DRNC (Drift RNC) that directly manages one or more cells where the UEs 311 to 314 are located, and the first RNC 302 is an SRNC (Serving RNC) that controls communication of the UEs 311 to 314. Called.

  FIG. 3 shows an MBMS service procedure between the UE and the network. In FIG. 3, the BM-SC 206 communicates with the UE 202 through the RNC 204. Further, the RNC 204 communicates with the BM-SC 206 through SGSN (not shown). Although FIG. 3 shows one RNC 204 and one UE 202, the embodiment of the present invention can be applied to a plurality of UEs and a plurality of RNCs that desire to receive the MBMS service, and is limited to this. is not.

  Referring to FIG. 3, in a service subscription stage 210, a user desiring to receive an MBMS service, ie UE 202, registers itself with the service provider's BM-SC 206. At this stage, the BM-SC 206 exchanges basic information related to charging and service reception with the UE 202.

  In the service announcement stage 220, the UE knows basic information about the MBMS service. For example, the UE recognizes an MBMS identifier (ID) for distinguishing MBMS services that can be provided by the BM-SC 206, a service start time, and a duration. This MBMS ID includes a multicast address and an access point name (hereinafter referred to as “APN”). In this advertisement phase 220, nodes located between the BM-SC 206 and the UE 202, that is, the RNC 204, the SGSN, and the relay network, recognize the UE 202 and a node connected to the UE 202. For example, the SGSN grasps a list of UEs that desire to receive the MBMS service and a list of RNCs where the UE is located, and transmits MBMS data only to the RNC where the UE is located based on the list.

  After acquiring the basic information of the MBMS service, the UE 202 performs a service joining step 230 in order to receive the desired MBMS service data. The UE 202 transmits at least one MBMS ID desired among the MBMS IDs obtained through the announcement stage 220 to the BM-SC 206.

  A service notification stage 240 calls the UE 202 to inform that the MBMS service requested by the UE 202 is about to start. That is, the notification step 240 performs group paging for a plurality of UEs participating in the MBMS service.

  Radio resource allocation stage 250 allocates radio resources between UE 202 and RNC 204 to provide MBMS service and provides corresponding information to related nodes. The RNC 204 performs point-to-multipoint (PTM) and point-to-point (PTP) based on information on the number of UEs belonging to each cell and a radio resource management (Raio Resource Management: RRM) function. One of the modes can be selected.

  In a data transfer step 260, actual MBMS data is transmitted to the UE 202 through the RNC 204. When it is necessary to change information related to this MBMS service, for example, a ciphering key, the RNC 204 provides a new encryption key to all UEs that receive the MBMS service.

  When the MBMS service is terminated, a radio resource release stage 270 notifies the UE 202 that the allocated radio resource is released and the MBMS radio resource is released. Although not shown, in step 250, the UE 202 may voluntarily request to interrupt the reception of the MBMS service while receiving the MBMS service, and may request to block the MBMS service.

  For each MBMS service, the RNC manages an MBMS context in which information on UEs that want to receive the MBMS service is stored. One MBMS service consists of several sessions. This MBMS context is managed until the MBMS service ends or until there is no UE receiving the MBMS service in the RNC regardless of the start and end of the session, and is included in the MBMS context when a new session starts. In consideration of the number of UEs, it is determined whether the session is transmitted by the PTP method or the PTM method. The process of counting the number of UEs is a counting stage.

  FIG. 4 shows a situation where the same MBMS service is transmitted in the first cell 401 and the second cell 402. As shown, the same session can repeatedly appear for the MBMS service, which is referred to as a “repeated session”. In such a repetitive session situation, if the UE has already received the same session, the RNC can further increase the efficiency of the radio resources by excluding the UE from the counting phase.

  In a repetitive transmission situation as described above, the SRNC knows that the UE has already received a session, but if the UE moves to another cell managed by the DRNC, as indicated by reference numeral 450, the DRNC Includes this UE in the counting process. In this case, since the UE does not actually receive the session, an MBMS service for which the PTP scheme is desirable may be set to the PTM scheme, thereby causing a waste of radio resources.

  Therefore, there is a need for a method and apparatus for detecting that a UE moves to a new DRNC during a session and notifying the DRNC whether or not the UE has received a session.

  Therefore, in order to solve the above problems, the object of the present invention is to determine whether the UE actually received the session when the UE moves to the target cell managed by the DRNC. It is to provide a method and an apparatus for determining and providing the result information to DRNC.

  In addition, an object of the present invention is that a DRNC that has received information indicating whether or not a UE actually receives a session from an SRNC can more efficiently use radio resources by excluding the UE from the counting process. It is to provide a method and apparatus that can be used.

  To achieve the above object, the present invention provides a method for transmitting session indifference indication information for a terminal's MBMS service in a multimedia broadcast / multicast service (MBMS) system, comprising a serving radio network controller (SRNC). ) Determines whether the terminal wishes to receive a current session for the MBMS service subscribed by the terminal, and the SRNC determines whether the terminal has a session for the MBMS service according to the determination result. Transmitting indifference indication information to a drift radio network controller (DRNC); and the DRNC includes the terminal in an MBMS context for the MBMS service, and the terminal is added to the MBMS service according to the session indifference indication information of the terminal. County for Determining whether or not to exclude from the storage.

  Also, the present invention provides an MBMS system that provides a multimedia broadcast / multicast service (MBMS) to a terminal, and determines whether or not it is desired to receive a current session for the MBMS service subscribed by the terminal. A serving radio network controller (SRNC) that generates session indifference indication information of the terminal, and receives the session indifference indication information of the terminal from the SRNC, and in accordance with the session indifference indication information, the terminal is used for the MBMS service. And a drift radio network controller (DRNC) for determining whether or not to exclude them from counting.

  In the present invention, when a UE moves to a cell managed by a new RNC, the SRNC determines whether the UE is interested in the session and provides the information to the DRNC. If it is determined that the UE is not interested in the session, the DRNC can increase the efficiency of radio resources by not including the UE in the counting. That is, the embodiment of the present invention informs the DRNC whether or not the UE receives a session of the current service for the subscribed service regardless of its mobility, thereby improving the efficiency of radio resources. There is an effect that can be increased more.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  In the following, when it is determined that a specific description of a known function or configuration related to the present invention makes the gist of the present invention unclear, the detailed description thereof will be omitted.

  The gist of the embodiment of the present invention is to provide UE's 'session interest information' for a specific MBMS service from SRNC to DRNC. Here, the expression “UE is not interested in a specific MBMS service” includes a case where the UE has already received the same session in a repetitive transmission situation. Also, the expression “UE is interested in a particular MBMS service” includes the case where the UE has not received a session before.

  FIG. 5 shows a signal flow diagram when a UE in a state other than CELL_DCH (Cell_Dedicated Channel), that is, without a DCH moves to another cell according to a preferred embodiment of the present invention.

  Referring to FIG. 5, if a high reception sensitivity of a neighboring cell is detected in step 510, the UE 501 transmits a cell update message to the DRNC 502 that controls the neighboring cell. In step 520, the DRNC 502 transmits a cell update message to the SRNC 503 through an uplink signaling transmission message.

  When receiving the cell update message, the SRNC 503 determines in step 530 whether the MBMS service subscribed by the UE 501 is currently in progress, and if this MBMS service is currently in progress, the UE 501 Determine whether to receive the current session of the service.

  When it is determined that the UE 501 receives the current session, the SRNC 503 sets the non-interest indication indicating that the UE 501 receives the current session to be unset, and sets the unset indifference indicator to the MBMS. It is included in the downlink signal transfer (DST) message together with the service ID of the service. Here, unsetting the indifference indicator applies to a method in which the indifference indicator is not included in the downlink signaling message or a method in which the indifference indicator is set to N (No).

  If the UE 501 subscribes to the service but does not receive a current session, the SRNC 503 sets an indifference indicator and includes it in the downlink signaling message along with the service ID. Here, setting the indifference indicator applies to the method of setting the indifference indicator to Y (Yes).

  In FIG. 5, when UE 501 is interested in MBMS service S1 and not interested in MBMS service S2, in step 530, SRNC 503 unsets the indifference indicator for S1, and sets S2 to S2. On the other hand, an indifference indicator is set. In step 540, the SRNC 503 transmits a downlink signal transmission message to the DRNC 502.

  In step 550, the DRNC 502 determines whether an indifference indicator is set in the downlink signaling message for each MBMS service. As a result, if the indifference indicator is set, the DRNC 502 includes the UE 501 in the MBMS context and excludes the UE 501 from counting. However, if it is determined that only the service ID is included in the downlink signaling message without setting the indifference indicator, the DRNC 502 includes the UE 501 in the MBMS context and at the same time determines the transmission mode of the MBMS service. The UE 501 is included in the counting. For reference, let the stage of including the UE in the MBMS context be “attach”.

  In step 560, the DRNC 502 transmits a cell update confirmation message to the UE 501. Further, the DRNC 502 can transmit a cell update confirmation message after transmitting the uplink signal transmission message.

  FIG. 6 shows a signal flow diagram for moving a UE in CELL_DCH state, i.e. having DCH, to a cell managed by DRNC according to a preferred embodiment of the present invention.

  Referring to FIG. 6, in step 610, the SRNC 603 determines whether to move the UE 601 to a cell managed by the new DRNC 602, and in step 620, whether the UE 601 actually receives a session for the MBMS service. Determine whether or not.

  If it is determined that the UE 601 actually receives the current session, in step 620, the SRNC 603 unsets the indifference indicator indicating that the UE 601 receives the current session. The ID is included in the radio link setup message. However, if the UE 601 subscribes to the service but does not receive a current session, the SRNC 603 sets an indifference indicator and includes this in the radio link setup message along with the service ID.

  In step 630, the SRNC 603 transmits a radio link setup message to the DRNC 602.

  In step 640, the DRNC 602 determines whether the indifference indicator is set for each MBMS service in the radio link setup message. If the indifference indicator is set, the DRNC 602 includes the UE 601 in the MBMS context and excludes this UE 601 from counting. However, if the indifference indicator is not set and it is determined that only the service ID is included in the radio link setup message, the DRNC 602 includes the UE 601 in the MBMS context and at the same time the UE 601 counts for the MBMS service. Including.

  In step 650, the SRNC 603 transmits the active set update message to the UE 601 as a result of the step 610, so that the UE 601 performs the handover.

  In FIG. 5 and FIG. 6, an indifference indicator including whether a UE receives a current session including a downlink signaling (DST) message or a radio link setup message transmitted from the SRNC to the DRNC is shown in Table 1 below. And the format shown in Table 2.

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

  For example, if the indifference indicator is set to '1', it indicates that the UE has subscribed to the MBMS service but does not receive the current session. However, if the indifference indicator is set to '0', it indicates that the UE receives the current session. For example, the 1-bit indicator assumes a situation in which session transmission timings of a cell in which the UE is initially located and a cell to be moved match.

  Table 2 shows an indifference indicator indicating whether or not the UE is interested in a session corresponding to the session ID, including the session ID of the current session in the session setting instruction information of the UE according to the second embodiment of the present invention. Shows how to provide the DRNC.

  This method can also be used when session transmission timing does not match between cells. By using the inclusion indication of the session ID as an indifference indicator, the DRNC can determine whether or not the UE can receive the corresponding session.

  FIG. 7 is a flowchart showing the operation of the SRNC according to the signal flow diagram of FIG.

  Referring to FIG. 7, in step S700, the SRNC receives a cell update message from a UST (Uplink Signaling Transfer) system, and in step S710, determines whether the cell update message requests a handover between RNCs.

  If it is determined that a handover is required for the new RNC, the SRNC checks the number n of MBMS services subscribed by the UE and sets the index i to '0' in step S720. Then, in step S730, the SRNC determines whether i is smaller than n. As a result, if i is greater than or equal to n, the SRNC proceeds to step S780. On the other hand, if i is smaller than n, the SRNC repeatedly performs steps S740 to S770 for all MBMS services subscribed by the UE.

  That is, in step S740, the SRNC confirms whether the UE is interested in the current session of the i-th MBMS service. If it is determined that the UE is interested in the current session, that is, if the UE receives the current session, the SRNC proceeds to step S755 and sets the indifference indicator unset for the i th MBMS service. . However, if the UE has subscribed to the i th MBMS service but is not interested in the current session, ie if the UE does not receive the current session, the SRNC sets an indifference indicator for the i th MBMS service in step S760. In step S770, the service list includes the service ID of the i-th MBMS service and the indifference indicator, and after i is increased by 1, the process returns to step S730.

  After repeating steps S730 to S770 for all MBMS services subscribed by the UE, the SRNC includes a service list of the form shown in <Table 1> or <Table 2> in the DST message in step S780, and In S790, the DST message is transmitted to the DRNC.

  As a result of the determination in step S710, if a handover is not required for the new DRNC, the SRNC proceeds to step S790, transmits the existing DST message to the DRNC, and ends the operation procedure.

  FIG. 8 is a flowchart showing the SRNC operation according to the signal flow diagram of FIG.

  Referring to FIG. 8, in step S800, the SRNC decides to hand over the UE in the CELL_DCH state, and in step S810, determines whether or not there is a need to hand over to a new DRNC.

  If it is determined that the handover is performed to the new DRNC, the SRNC proceeds to step S820. Otherwise, the SRNC transmits an existing radio link setup message to the DRNC in step S890, and ends the above operation.

  In step S820, the SRNC confirms the number n of MBMS services subscribed by the UE and sets the index i to 0. Thereafter, in step S830, the SRNC determines whether i is smaller than n. If i is greater than or equal to n, the SRNC proceeds to step S880. However, if i is smaller than n, the SRNC repeatedly performs steps S840 to S870 for all MBMS services subscribed by the UE.

  That is, the SRNC checks whether the UE is interested in the current session of the i-th MBMS service. As a result of the determination, if the UE is interested in the current session, that is, if the UE receives the current session, the SRNC proceeds to step S855 and does not set the indifference indicator for the i-th MBMS service.

  However, if the UE has subscribed to the i th MBMS service but is not interested in the current session, ie if the UE does not receive the current session, the SRNC is indifferent to the i th MBMS service in step S860. The indicator is set, and the service list includes the service ID of the i-th MBMS service and the indifference indicator in step S870, and after i is incremented by 1, the process returns to step S830.

  After repeating steps S830 to S870 for all MBMS services subscribed by the UE, in step S880, the SRNC includes the service list shown in Table 1 or Table 2 in the radio link setup message, and In S890, a radio link setup message is transmitted to the DRNC, and the above procedure is terminated.

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

  Referring to FIG. 9, in step S900, the DRNC receives a downlink signaling (DST) message or a radio link setup message from the SRNC to a specific UE. In step S910, the DRNC receives the received downlink signaling message or It is determined whether the wireless link setup message includes a service list as shown in <Table 1> or <Table 2>. If the service list is not included as a result of the determination, the DRNC performs a predefined DRNC operation in step S980.

  However, if it is determined that the service list is included, in step S920, the DRNC checks the number n of MBMS services subscribed by the UE and sets the index i to 0, and then in step S930, The DRNC determines whether i is less than n. As a result of the determination, if i is greater than or equal to n, the DRNC proceeds to step S980. As a result of the above determination, if i is smaller than n, the DRNC repeatedly performs steps S940 to S970 for all MBMS services subscribed by the UE.

  That is, in step S940, the DRNC confirms whether an indifference indicator is set for the i-th MBMS service included in the service list. As a result, if the indifference indicator is set for the i-th MBMS service, in step S960, the UE is added to the MBMS context of the i-th MBMS service to add the UE to the i-th MBMS service transmission mode. Is excluded from counting to determine.

  However, if the indifference indicator is not set for the i-th MBMS service, the DRNC adds the UE to the MBMS context of the i-th MBMS service in step S950 and simultaneously counts the UE for the i-th MBMS service. Include in

  After performing steps S930 to S970 for all MBMS services included in the service list, the DRNC performs an existing operation using a downlink signal transmission message or a radio link setup message in step S980 and ends the operation. To do.

  The third embodiment of the present invention is not interested in a service or a session of services in which the UE is currently in progress of one or more MBMS services subscribed by the UE, regardless of the mobility of the UE. Indicates whether or not.

  FIG. 10 shows a signal flow diagram according to the third embodiment of the present invention. Here, the UE subscribes to MBMS services S1 and S2.

  Referring to FIG. 10, in step 1010, the SRNC 1003 receives an MBMS change request message including indifference indication information for the MBMS service from the UE 1001. In step 1020, the SRNC 1003 checks whether the UE 1001 is interested in the current session of each MBMS service subscribed by the UE 1001. In FIG. 10, it is assumed as an example that the UE 1001 is not interested in S2.

  In step 1030, the SRNC 1003 transmits indifference indication information indicating that the UE 1001 is not interested in S2 to the DNRC 1002 in the MBMS session disconnection indication message.

  Table 3 below shows an example of an MBMS session disconnection instruction message according to the third embodiment of the present invention.

  As shown in Table 3 above, the MBMS session disconnection instruction message always includes at least one MBMS service identifier TMGI (Temporary MBMS Group Identify), so that the UE 1001 subscribes but does not receive the service. The information MBMS bearer service list is provided to the DRNC 1002. Further, the MBMS session disconnection instruction message includes the session ID of the current session in the MBMS bearer service list, thereby transmitting whether or not the UE can receive the current session for each MBMS service.

  In step 1040, the DRNC 1002 does not perform the counting including the UE for the MBMS service included in the MBMS bearer service list included in the received MBMS session disconnection indication message.

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

  Referring to FIG. 11, when an MBMS change request message indicating that the current session of a specific MBMS service is not interested is received from the UE in step S1100, the SRNC receives the number n of MBMS services subscribed by the UE in step S1110. In step S1120, the SRNC determines whether i is smaller than n. As a result, if i is greater than or equal to n, the SRNC proceeds to step S1170. On the other hand, if i is smaller than n, the SRNC repeatedly performs steps S1130 to S1160 for all MBMS services subscribed by the UE.

  That is, the SRNC confirms the context of the i-th MBMS service in step S1130, and determines whether the UE is interested in the i-th MBMS service in step S1140. As a result, if the UE is not interested in the i-th MBMS service, the SRNC includes the service ID and session ID of the i-th MBMS service in the MBMS bearer service list in step S1150, and in step S1160, i After incrementing by 1, the process returns to step S1120. However, if the UE is interested in the i th MBMS service, the SRNC proceeds to step S1160.

  After determining whether the UE is interested in all MBMS services currently in progress, the SRNC includes the MBMS bearer service list in the MBMS session disconnection indication message in step S1170, and in step S1180, the DRNC An MBMS session disconnection instruction message is transmitted.

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

  Referring to FIG. 12, in step S1200, the DRNC receives an MBMS session disconnection instruction message including an MBMS bearer service list for a specific UE from the SRNC. In step S1210, the DRNC confirms the number n of MBMS services included in the MBMS bearer service list and sets the index i to '0'. In step S1220, the DRNC determines whether i is smaller than n. As a result, if i is greater than or equal to n, the DRNC ends the operation in step S1250. However, if i is smaller than n as a result of the determination, the DRNC repeatedly performs steps S1230 and S1240 for all MBMS services subscribed by the UE. That is, in step S1230, the DRNC excludes the UE from counting for determining the transmission mode of the i-th MBMS service included in the MBMS bearer service list, and increments i by 1 in step S1240. The process returns to S1220.

  As described above, in the detailed description of the present invention, specific embodiments have been described. However, it is usual in the technical field that various changes in form and details can be made without departing from the scope of the claims. It is clear to those who have knowledge of. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined based on the description of the scope of claims and equivalents thereof.

It is a figure which shows the network structure for a general MBMS service. It is a figure which shows the condition where SRNC and DRNC differ with respect to a general specific UE. It is a figure which shows the general MBMS service procedure between UE and a network. It is a figure which shows the case where the same MBMS service is transmitted to two adjacent cells. It is a figure which shows the flowchart of the signal between UE in a state other than RNC and CELL_DCH by the 1st Embodiment of this invention. FIG. 6 is a diagram illustrating a signal flow diagram between an RNC and a UE in a state other than CELL_DCH according to the second embodiment of the present invention. 6 is a flowchart showing the operation of the SRNC according to the signal flow diagram of FIG. It is a flowchart which shows operation | movement of SRNC by the signal flowchart of FIG. 5 is a flowchart showing an operation of a DRNC according to the first and second embodiments of the present invention. FIG. 6 is a signal flow diagram according to a third embodiment of the present invention. 7 is a flowchart illustrating an operation of an SRNC according to a third embodiment of the present invention. 7 is a flowchart illustrating an operation of a DRNC according to a third embodiment of the present invention.

Explanation of symbols

110 Broadcast Multicast Service Center (BM-SC)
120 transit network
130 SGSN (Serving GPRS Support Node)
140 Radio Network Controller (RNC)
150 Mobile Switching Center (MSC)
160 First cell 170 Second cell 161, 162, 163, 171, 172 User terminal (UE)
202 UE
204 RNC
206 BM-SC
210 Service Subscription Stage 220 Service Announcement Stage 230 Service Joining Stage 240 Service Notification Stage 250 Radio Resource Allocation Stage 260 Data Transfer Stage 270 Radio Resource Release (radio resource release) stage 301 core network (CN) node 302 first RNC
303 2nd RNC
311 to 314 UE
331 Wired route 332 Wired route 401 First cell 402 Second cell 501 UE
502 DRNC
503 SRNC
601 UE
602 DRNC
603 SRNC
1001 UE
1002 DRNC
1003 SRNC

Claims (13)

A method for transmitting session indifference indication information for an MBMS service of a terminal in a multimedia broadcast / multicast service (MBMS) system, comprising:
A serving radio network controller (SRNC) determines whether the terminal wishes to receive a current session for an MBMS service subscribed by the terminal;
The SRNC transmits session indifference indication information for the MBMS service of the terminal to a drift radio network controller (DRNC) according to the determination result;
The DRNC includes the terminal in an MBMS context for the MBMS service and determines whether to exclude the terminal from counting for the MBMS service according to the session indifference indication information of the terminal;
An MBMS service method comprising:   The SRNC may further receive a cell update request from the terminal through the DRNC before determining whether it wishes to receive a current session for the MBMS service subscribed by the terminal. The MBMS service method according to claim 1.   The SRNC further receives the session indifference indication information for the MBMS service from the terminal before determining whether or not it wishes to receive a current session for the MBMS service subscribed by the terminal. The MBMS service method according to claim 1, wherein: The session indifference instruction information is:
The MBMS service method according to claim 1, further comprising an indifference indicator indicating that the terminal does not want to receive a current session and a service ID of the MBMS service. The transmitting step includes
Unsetting the indifference indicator when the terminal is currently receiving a session for the MBMS service;
Setting the indifference indicator if no current session is received for the MBMS service;
Transmitting the indifference indicator together with the service ID of the MBMS service to the DRNC;
The MBMS service method according to claim 4, further comprising: The step of determining includes
Excluding the terminal from counting for the MBMS service if the indifference indicator is set;
Including the terminal in the counting for the MBMS service if the indifference indicator is unset;
The MBMS service method according to claim 5, further comprising:   A 1-bit identifier is used as the indifference indicator when session transmission timings between a cell located before the terminal moves and a cell located after the terminal moves substantially coincide. The MBMS service method according to claim 4. An MBMS system that provides multimedia broadcasting / multicast service (MBMS) to a terminal,
A serving radio network controller (SRNC) that generates session indifference indication information for the terminal indicating whether it wants to receive a current session for the MBMS service subscribed by the terminal;
A drift radio network controller (DRNC) that receives session indifference indication information of the terminal from the SRNC and determines whether to exclude the terminal from counting for the MBMS service according to the session indifference indication information;
An MBMS system comprising:   9. The MBMS system according to claim 8, wherein the SRNC is configured to receive a cell update request from the terminal through the DRNC and generate session indifference indication information of the terminal.   The MBMS system according to claim 10, wherein the DRNC is configured to determine whether the terminal receives a current session based on the session indifference indication information received from the terminal. .   9. The MBMS system according to claim 8, wherein the session indifference indication information includes an indifference indicator indicating that the terminal does not want to receive a current session and a service ID of the MBMS service. The SRNC is
The indifference indicator is not set when the terminal is receiving the current session, the indifference indicator is set when the terminal is not receiving the current session, and the indifference indicator is set to the MBMS service. The MBMS system according to claim 11, wherein the MBMS system transmits the service ID to the DRNC together with the service ID. The DRNC is
The terminal is excluded from counting for the MBMS service when the indifference indicator is set, and the terminal is included in the counting for the MBMS service when the indifference indicator is not set. Item 13. The MBMS system according to Item 12.

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