KR20050047439A - Method for transmit control information for efficient ue operation in a mobile communication system serving multimedia broadcast/multicast service - Google Patents

Abstract

The present invention provides a multimedia broadcast / multicast service (MBMS) for providing the same service to a plurality of terminals or a service desired by the plurality of terminals in a mobile communication system using a code division multiple access system. The present invention relates to a method of transmitting an MBMS control message for efficient terminal operation.

According to the MBMS control message transmission method of the present invention, the overhead of information transmitted on the air interface is reduced, and the operation of the radio network controller (RNC) and the terminal is simplified, thereby saving power of the terminal.

Description

In a mobile communication system supporting a multicast multimedia broadcasting service, a method of transmitting control information for efficient operation of a terminal is provided.

The present invention provides a method for efficiently transmitting MBMS control information to a terminal in a mobile communication system that provides a multimedia broadcast / multicast service (hereinafter, referred to as MBMS). The MBMS refers to a service for transmitting the same multimedia data to a plurality of receivers through a wireless network.

FIG. 1 is a diagram illustrating a wireless communication network for supporting an MBMS to which the present invention is applied. Here, a structural diagram applied to a 3GPP system, which is a standard of a third generation asynchronous mobile communication method, is used to help understanding of the present invention.

Referring to FIG. 1, UEs 101, 102, 103, 104, 105, 106, 107, and 108 of FIG. 1 are capable of receiving MBMS data according to the MBMS service. Used interchangeably). In addition, Cell 1, Cell 2, Cell 3 of the reference numerals 111, 112, and 113 refer to the cell area of the base station where the UEs are located. Node B (121) (a term used in 3GPP to refer to a device that plays a wired signal or vice versa) refers to the UEs 101, 102, 103, 104, 105, 106, 107, and 108 means a base station for transmitting MBMS. The radio network controller 131 (hereinafter, referred to as 'RNC' as used in 3GPP) represents a base station controller for controlling a plurality of Node Bs. The RNC 131 selectively transmits multimedia data provided through the MBMS service to specific Node Bs 121 supporting or transmitting the MBMS. In addition, it serves to control radio channels established between the Node B 121 and the UEs 101, 102, 103, 104, 105, 106, 107, and 108 to provide the MBMS. Here, the Node B 121 under the control of the RNC 131 and the RNC 131, Cell 1 (111), Cell 2 (112), and Cell 3 (113) in the Node B 121 are UMTS radios. Access network (UMTS Radio Access Network: referred to as 'UTRAN'), the UTRAN is a UE (101, 102, 103, 104, 105, 106, 107, 108) and the core network (Core Network: hereinafter 'CN') It is connected to ').

A service packet wireless service support node (hereinafter referred to as 'SGSN') of 141 serves to control MBMS related services of respective subscriber stations (UEs). Representative examples include managing service billing data of each subscriber and selectively transmitting multimedia data to a specific RNC. The Home Location Register (HLR) of the 151 is connected to the SGSN 141 to authenticate a subscriber. The gateway packet wireless service support node (hereinafter referred to as 'GGSN') of the 161 refers to MBMS data to be supplied to the UE, referred to as the 181 multicast broadcast service center (hereinafter referred to as 'BM-SC'). SGSN 141 is received from a Contents Provider of 191 and a Multicast Broadcast Source of 192 and 193 through Border Gateway (BG) of 171. To send. In this case, the GGSN 161 plays a role of managing the movement status of each UE 101, 102, 103, 104, 105, 106, 107, 108, and service quality management of the MBMS serviced by the UE. The BG 171 receives MBMS data from the Multicast Broadcast source 192 in a network not currently managed by the service provider and transmits the MBMS data to the GGSN 161. In addition, the BM-SC 181 receives MBMS data from a contents provider 191 and delivers the MBMS data to the GGSN 161, and authenticates the contents provider 191 and determines the quality of service of the MBMS. , Error correction function for MBMS data loss, charging for contents provider (Contents Provider) 191, and serving as MBMS notification currently being serviced for UE. Content providers (911) and 192,193 multicast broadcast sources indicate the source of MBMS data transmission.

Here, the MBMS data stream is passed from the content provider (Contents Provider) 191 via the BM-SC (181), from the Multicast Broadcast Source (192) to the BG (171), or directly from the Multicast Broadcast Source (193). 161, a plurality of UEs 101, 102, 103, 104, 105, 106 via SGSN 141, RNC 131, Node B 121, and respective Cells 111, 112, 113. 107, 108). Although not shown in FIG. 1, a plurality of SGSNs and a plurality of RNCs connected to each SGSN may exist for one MBMS. In addition, the SGSN is an RNC, and the RNC needs to perform selective data transmission to Node B. For this purpose, a list of nodes (SGSG list in RSN, Node B list in RNC), etc., is stored. do.

The structure of the MBMS service applied to the 3GPP system was described in FIG. 1, and FIG. 2 below illustrates a process in which the MBMS service is provided in a specific cell. Here, 201 indicates a terminal receiving the MBMS service, 211 indicates an RNC for the MBMS service, and 221 indicates an SGSN for the MBMS service.

Referring to FIG. 2, the service announcement step 231 is to deliver basic information on a specific MBMS service, for example, an identifier of the MBMS service and the availability of the service, to the terminal 201. .

In this case, when there is a service to be received among MBMS services recognized through the service announcement (Announcemen, 231), the terminal 201 performs a service request (Joining) process at 241. The service request (Joining) 241 informs the terminal 201 of the MBMS service to be received by the terminal 201 to the SGSN 221 and the terminal 201 after the SGSN 221 performs authentication or the like. A process of notifying whether the MBMS service can be received is made. In addition, the SGSN 221 stores a list and a location of a terminal to receive a specific MBMS service through the service request (241).

If the BM-SC notifies the start of the MBMS service in the future, in step 251, the SGSN 221 starts a session with the RNC 211 where the terminal 201 where the service request (Joining, 241) process is located is located (hereinafter referred to as BMS-SC). Send a message called 'Session Start'. In step 252, the RNC 211 transmits a service notification (hereinafter, referred to as 'Notification') message to call the terminal 201 to receive the MBMS service. Since a plurality of terminals can be called through the notification message transmission, step 252 is also referred to as a group paging process in a sense that is different from the existing calling procedure.

In step 261, the terminal 201 called in step 252 transmits a response message. Through the response message transmission procedure, the RNC 211 may determine the number of terminals to receive the MBMS service for each cell and determine the type of radio channel of the corresponding cell. If the number of terminals to receive the MBMS service is greater than a predetermined predetermined threshold value, if the MBMS service is provided through a common channel (Point to Multipoint, hereinafter referred to as PtM), and if the number of terminals is smaller than the predetermined predetermined threshold value, MBMS service may be provided by configuring a dedicated channel (Point to Point, hereinafter PtP) for each terminal.

Accordingly, in step 271, the RNC 211 transmits MBMS Radio Bearer (hereinafter, referred to as 'RB') information to the terminal 201. The MBMS RB information includes radio channel information to be provided with the MBMS service, for example, OVSF code information, transport format information, radio link control (hereinafter, referred to as RLC) information, and packet data conversion control. Packet Data Convergence Control, hereinafter referred to as 'PDCP') information. Therefore, in step 281, the terminal 201 receives the MBMS service provided through the MBMS RB in step 271.

1 and 2 have been described a system structure for the MBMS service and the process of the MBMS service. In addition to the MBMS data stream, the MBMS service has a multicast characteristic of a control signal for controlling the MBMS service. For example, MBMS RB information to be used when providing a specific MBMS service in a specific cell is valid information for all UEs that want to receive the MBMS service in the cell. Therefore, it is efficient that control signals related to MBMS are transmitted through a common control channel configured in a cell. Currently, 3GPP, which is in charge of standardizing MBMS, is discussing a method of transmitting MBMS control signals through a new logical channel called MCCH (MBMS Control Channel, hereinafter referred to as MCCH).

3 is a diagram illustrating a method of transmitting an MBMS control message (MCCH) according to the prior art.

Referring to FIG. 3, 301 denotes a paging indicator channel (hereinafter referred to as 'PICH'), and 302 denotes an MCCH for transmitting control information. For example, when an event related to the MBMS service occurs, the RNC 211 generates a session start or transmits a control message based on the MBMS event. In this case, the RNC 211 first wakes up terminals belonging to the MBMS paging group by using MBMS paging identification information of the PICH exclusively used for the terminal 201. The operation of the PICH is applied to terminals in idle mode, CELL_PCH, and URA_PCH states. In operation 311, MBMS paging identification information of the PICH is set and transmitted according to the occurrence of the MBMS event. In this case, the PICH has not been determined whether to use the PICH used for Rel99 or the MBMS dedicated PICH used for REL6, but does not affect the present invention.

In step 311, the UE, which is woken up by MBMS paging identification information, receives an MCCH channel and receives an MBMS paging discontinuous reception (DRX: Discontinuous Reception (DRX)) cycle. Paging Channel, hereinafter referred to as 'PCH'.

321, 322, and 323 represent MBMS PCHs transmitted with MBMS Paging DRX cycles. If the terminal decodes the MBMS paging identification information (indication) through 311 at an intermediate time point between 321 and 322 and knows the transmission of the MBMS PCH, the terminal 201 transmits the MBMS PCH message at a predetermined time. MBMS PCH will be received at a predetermined time point 322. At this time, the terminal 201 checks the MBMS Service Id through the MBMS PCH of 322. If there is a service identifier (MBMS Service Id) that the terminal joins in the MBMS PCH, the MS until the MBMS control message corresponding to the cause value of the MBMS page message (PCH) is received. Receive the MCCH channel continuously.

For example, if the MBMS paging message (PCH) received at 322 includes a service identifier (MBMS Service Id) that the terminal joins a service request and the MBMS paging cause value (cause value) is set to session start The RNC 211 continuously establishes an MBMS RB and continuously transmits an MCCH channel until it informs the session start to a terminal that has set up the MBMS RB. In FIG. 3, when the MBMS RB is determined to be an RB in the PTM mode, the PTM RB information is transmitted through a 324 message. Therefore, the terminal 201 receiving the MBMS paging message (PCH) at 322 must continuously receive the MCCH channel until 324 receiving the MBMS PTM RB at 322. That is, the terminal 201 has to decode all messages including the MBMS paging message 323 received from 322 to 324, thereby causing an overhead. In this case, the MBMS paging messages are repeatedly transmitted until 324 MBMS control messages corresponding to the cause value of the MBMS paging message are transmitted.

That is, the transmission of the MBMS PTM RB information of the 324 is an MBMS event-based control message that is unknown when the RNC 211 is transmitted when the RB is set up, but the terminal 201 is an MBMS paging message 322. There is a problem that the overhead of the terminal is increased since the MCCH must be continuously received after receiving the MBMS PTM RB information message 324 corresponding to the MBMS paging message. That is, there is a problem that wastes power of the terminal 201.

Accordingly, an object of the present invention, which is invented to solve the problems of the prior art operating as described above, receives a MCCH channel only for a minimum period of time after a terminal receiving an MBMS paging message receives a MBMS service in a mobile communication system. To provide a way.

Another object of the present invention is to provide a method for defining the format and information of an MBMS paging message and an MBMS control message in a mobile communication system.

It is still another object of the present invention to provide a method for a terminal receiving an MBMS service in a mobile communication system to determine whether an MBMS control message is received according to cause value information of an MBMS paging message.

Another object of the present invention is to provide a method for determining whether a terminal receiving a MBMS service receives a MBMS control message according to counting identification information, even if the cause value information of the MBMS paging message is the same.

It is still another object of the present invention to provide a method for transmitting an MBMS paging message provided with an MBMS service in a mobile communication system at an MBMS paging dedicated time point.

It is still another object of the present invention to provide a method for receiving an MBMS service validity message and an MBMS radio bearer information message periodically transmitted by a terminal receiving an MBMS service in a mobile communication system.

It is still another object of the present invention to provide a method for defining an MBMS service validity message and an MBMS radio bearer information message according to provision of an MBMS service in a mobile communication system.

The first embodiment of the present invention, which was invented to achieve the above object, includes one or more terminals, cells in which the terminals are located, a wireless network control apparatus for managing one or more cells, and In a mobile communication system comprising a wireless network control device for providing a broadcast service for each service, the wireless network control device transmits a reception time of a control message to provide the broadcast service, the wireless network control device is Setting identification information according to the number of activation terminals requesting the broadcast service and a call cause value according to the broadcast service; and calling a call message including the identification information and the call cause value. And transmitting the terminal to receive at the call-only time point of the terminal. It features.

The second embodiment of the present invention, which is invented to achieve the above object, includes one or more terminals, cells in which the terminals are located, a wireless network control apparatus for managing one or more cells, and In a mobile communication system comprising a wireless network control device for providing a broadcast service for each service, the terminal receives a control message including radio bearer information, the terminal from the wireless network control device at the call-only time point Receiving a call message including identification information according to the number of transmitted terminals and a call cause value according to the broadcast service, and receiving the control message through the identification information and a call cause value according to the broadcast service After checking the time point, the control message is received at the time point.

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. Definitions of terms to be described below should be made based on the contents throughout the specification.

The present invention relates to transmitting an MBMS control message, and proposes a method of reducing an overhead of radio bearer (RB) information transmitted on an air interface, and saving power of the terminal by simplifying operations of the RNC and the terminal. do.

In this regard, in the first embodiment, the apparatus for controlling a wireless network transmits a call cause value including the call cause value for the MBMS service and identification information according to the number of activated terminals requesting the MBMS service in a call message. do. At this time, the reception time of the control message for receiving the MBMS service is determined according to each call cause value and the identification information.

First embodiment

4 is a diagram illustrating a process of transmitting MBMS control information according to the first embodiment of the present invention.

Referring to FIG. 4, 401 indicates a PICH channel and 402 indicates an MCCH channel. In step 411, the terminal decodes the MBMS paging identification information (occasion) assigned to it to determine whether the MBMS paging message is transmitted, and if the MBMS paging identification information exists in the terminal, the terminal 402 Receive the MCCH channel. Here, 421, 422, 423, and 424 indicate MBMS paging messages transmitted with an MBMS paging DRX cycle. Information on the transmission period of the MBMS paging message and information on when the MBMS paging message is transmitted is transmitted through a broadcast control channel (hereinafter referred to as 'BCCH') System Information Block (System Information Block) This can be seen through.

For example, if the terminal receives the MBMS paging message 422 through the MCCH channel 402, it checks the MBMS service identifier (ID) included in the MBMS paging message 422, the cause of the MBMS paging message Operate according to the value. In this regard, Table 1 below describes the operation of the terminal according to a cause value that the MBMS paging message may have.

Cause value of MBMS paging and operation of terminal MBMS paging cause Corresponding action Session start If the counting indication is set to true, the MCCH is not received until the next cycle of MBMS paging message is received, whereas if the counting indication is set to false, the MBMS RB Continue to receive MCCH until information is received. Recounting start Do not receive the MCCH until the next cycle of MBMS paging message is received. Recounting stop No longer receiving the MCCH channel. Session stop No longer receiving the MCCH channel.

For example, suppose that the MBMS paging messages of 421, 422, 423, and 424 in FIG. 4 are MBMS paging messages generated by a session start MBMS event, and the number of terminals in PMM connected mode for MBMS RB configuration. Suppose a counting procedure is needed because is not sufficient. If the cause value of the session start and counting indication are set to true in the MBMS paging message at 421, 422, and 423, the PMM idle mode terminal receiving the 421, 422, or 423 is wireless. Radio Resource Control (hereinafter referred to as 'RRC') The connection setup process begins. If, after 423, the RNC has a sufficient number of terminal lists for MBMS RB configuration, the MBMS paging message sent at 424 is set to the cause value of the session start and the counting indication to false. Is sent. In this case, 425 denotes transmission of MBMS PTM RB information for the MBMS service through MCCH.

The terminal receives the MCCH 402 according to a cause value of the MBMS paging and a counting indication value. That is, in the prior art, the MCCH channel must be continuously received until the MBMS RB information of 421 is received from 421 to which the first MBMS paging message is transmitted. On the other hand, in the present invention, if counting indication is set to true according to the cause value and the counting indication, the MCCH is received until the MBMS paging message of the next cycle is received. I never do that. Accordingly, in the paging messages 421, 422, and 423, when the cause value is a session start and the counting indication is true, the MCCH channel is not continuously received. That is, according to the cause value and the counting indication value at 421, the terminal does not receive the MCCH 402 for a period 422 at 421 and MBMS paging message at 422 by MBMS paging DRX cycle. Receive In the same way, the terminal does not receive the MCCH channel for the period 422 to 423 and the period 423 to 424. Thus, the power of the terminal is saved.

Also, if the counting indication is set to false, MCCH is continuously received until MBMS RB information is received. That is, if the terminal has set the cause value (cause value) to the session start at 424 and the counting indication (counting indication) is set to false, after receiving the MBMS paging message 424, MBMS RB of 425 The MCCH channel is continuously received until information is received.

As described above, the terminal continuously receives to receive the MCCH for the periods 421 to 422, 422 to 423, and 423 to 424 until the terminal receives the MBMS paging message at 421 and receives the MBMS RB information of 425. This saves power and reduces the overhead of continuous decoding.

5 is a diagram illustrating an operation flow of an RNC according to the first embodiment of the present invention.

Referring to FIG. 5, when an MBMS event occurs in 501, it is determined which event occurred in 502, 503, and 504. At this time, if an MBMS session start event occurs, the process proceeds from 502 to 511 and sets information in an MBMS paging message to be transmitted. In this case, as information to be set in the MBMS paging message, an MBMS service identifier (ID) and an MBMS paging cause value (cause value) according to the MBMS session start are set. In addition, a counting indication is set according to the number of terminals.

In this case, if the number of UEs in the PMM connected mode to receive the MBMS service maintained by the RNC is insufficient to set an MBMS PTM RB, counting identification information for requesting an RRC connection of the PMM idle mode terminal is indicated. Set the information to true. On the other hand, if the number of PMM connected mode terminals maintained by the RNC is sufficient to set the MBMS PTM RB, the counting indication may be set to false. That is, the counting identification information is set differently according to the number of terminals in the PMM connected mode. In addition, according to the type of MBMS event occurring at 501, the MBMS cause values are different at 511, 512, and 513, respectively. As a result, the terminal does not need to continuously receive the MCCH channel according to the MBMS cause value and counting indication value, thereby saving power of the terminal.

In step 521, the MBMS paging counting identification information for resetting the terminal in the idle mode and the CELL_PCH and URA_PCH states is reset for transmission of the MBMS paging message and transmitted at the time of paging transmission of each terminal through the PICH channel. Accordingly, in 531, the MBMS paging message is transmitted according to the number of terminals according to the MBMS paging, and the MBMS paging message may be transmitted through PCCH or MCCH.

Steps 541 and below are flows of the RNC when the RNC performs a counting procedure or when a recount event occurs to set MBMS RB when the RNC receives a session start from SGSN, the upper system. This situation occurs because the RNC does not maintain a list of terminals in the PMM connected mode.

In step 531, the RNC performs an operation for the RRC connection in the PMM idle mode based on a counting identification value of the MBMS paging message. In this case, after the terminals establish the RRC connection, the RNC may set the MBMS RB at 541. If the number of terminals determining the PTM RB exceeds the set threshold, the MBMS RB is set to the PTM RB. On the other hand, if the number of terminals according to the MBMS does not exceed the set threshold, the PTP RB is set. If the PTM RB is configured at 551, the PTM RB information is transmitted through the MCCH at 561. In addition, if the PTP RB is determined at 551, a radio bearer setup message for setting up the PTP RB is transmitted to the terminal at 562. In 571, the MBMS RB INFO message and the MBMS SA message are periodically updated and transmitted according to the MBMS event occurring in step 501.

6 is a diagram illustrating an operation flow of a terminal according to the first embodiment of the present invention.

Referring to FIG. 6, at 601, a terminal receives an MBMS paging message including an MBMS service identifier (ID) that has requested a service through an MCCH channel. At this time, the MBMS paging message of the 611, 612, 613, 614, the cause value (cause value) to determine what MBMS event occurred. That is, the MBMS paging cause value (cause value) is a value to inform the terminals of what MBMS event has occurred, and to perform an operation suitable for the generated MBMS event. That is, by distinguishing between when the MCCH channel should be continuously received and when it is not according to the MBMS paging cause value, the time required for the terminal to continuously receive the MCCH channel is minimized and accordingly Reduce the overhead of the terminal.

In this case, if the MBMS paging cause value is a session start at 611 and counting indication is false at 621, the terminal proceeds to 622. At 622, the MCCH channel is received until the PTM RB information is received through the MCCH or an RRC message for the PTP RB information is received. On the other hand, if the counting indication (counting indication) is set to true at 621, and if the terminal is in the PMM idle mode at 631 to perform the operation according to the RRC connection connection at 641 and the time for receiving the next MBMS paging message at 651 It does not receive the MCCH channel until. That is, it is recognized that the MBMS event message corresponding to the MBMS service is not transmitted during the period so that the terminal does not receive the MCCH channel. On the other hand, if the terminal is not in the PMM idle mode in step 631, the terminal proceeds to step 632 and does not perform an RRC connection connection.

In operation 612, when the terminal receives the MBMS paging message and confirms that the cause value is set to the recount start, the terminal proceeds to step 631 to perform a corresponding operation. In step 613, if an MBMS paging message having a cause value set to a recounting stop is received, step 622 is received. That is, the MCCH channel is continuously received until the PTM RB information is received through the MCCH or an RRC message for the PTP RB information is received. If, at 614, the terminal receives an MBMS paging message with the cause value (cause value) session stop, go to 623 and stop receiving MBMS data without receiving MCCH any more and update the MBMS service context maintained by the terminal. do. At this time, if an MBMS paging message having a cause value of an unspecified type is received, the process proceeds to 615 and assumes that an error has occurred.

Second embodiment

Hereinafter, in order to reduce an operation for receiving an MBMS paging message, an operation for receiving an MBMS event-based message, and an overhead for continuously receiving an MCCH channel, a terminal receiving the MBMS service is provided with an MBMS paging message according to the first embodiment. MBMS service availability (MBMS Service Availability, hereinafter referred to as MBMS SA message) and MBMS Radio Bearer Information (MBMS RB INFO), which are periodically transmitted without using MBMS event-based messages. We will propose a method of utilizing the message. Here, the MBMS SA message and the MBMS RB INFO message are messages that periodically transmit information on the MBMS service that can be serviced in a cell through the MCCH to support mobility of the terminal.

7 is a diagram illustrating a process of transmitting MBMS control information according to a second embodiment of the present invention.

Referring to FIG. 7, 701 represents a PICH channel and 702 represents an MCCH channel. 711 illustrates a process of setting and transmitting MBMS paging identification information at a paging call point (occasion) corresponding to a terminal through a PICH channel. Here, 722, 723, 724, and 726 represent MBMS paging messages (PCH) and 727 represents MBMS event based control messages according to the MBMS paging. On the other hand, 721 and 725 indicate MBMS SA messages transmitted periodically, and 728 indicates MBMS RB INFO messages transmitted periodically.

In FIG. 7, the MBMS paging message of 722, 723, 724, 726 and the control message based on the MBMS event of 727 are not used. That is, the MCCH has periodic MBMS SA messages 721, 725, and periodic MBMS. Use only 728 RB INFO messages.

According to the second embodiment, the operation of the RNC reduces the power consumption for transmitting the MBMS paging message and the power for transmitting the MBMS event-based message, and also simplifies the operation and facilitates scheduling. In addition, since the terminal is also periodically transmitted, wake up only at the time of transmission of the predetermined MBMS SA and MBMS RB INFO messages and receive the MCCH, thereby simplifying the reception operation and reducing power consumption.

8 is a diagram illustrating an operation flow of an RNC according to a second embodiment of the present invention.

Referring to FIG. 8, when an MBMS event occurs at 801, the RNC sets and transmits MBMS paging identification information through a PICH at 821. Thereafter, the service information is updated and transmitted in the MBMS SA message and the MBMS RB message periodically transmitted at 831. That is, the RNC sets and transmits MBMS paging identification information through the PICH at 821 regardless of the session start event at 811, the recount event at 812, and the session stop event at 813, and the MBMS SA message periodically transmitted at 831. The information of the corresponding service is updated and transmitted in the MBMS RB message. In this case, the PICH including the MBMS paging identification information may be transmitted, and the MBMS paging message (PCH) including the MBMS service identifier (ID) may be transmitted through the PCCH channel.

9 is a diagram illustrating an operation flow of a terminal according to a second embodiment of the present invention.

Referring to FIG. 9, it is checked at 901 whether the terminal has received a predetermined number of MBMS SA messages or whether a predetermined DRX cycle has been exceeded. This is because when an event of the MBMS service occurs, a certain time is required until the corresponding MBMS control message is transmitted by the event. For example, the MBMS service is added to the MBMS SA message received by the terminal after receiving the PICH at the session start. If the identifier (ID) and the PTM identification information are set to false, it cannot be guaranteed that the information is absolutely up to date.

That is, the information is because the RNC sets the MBMS RB to PTM and the PTM identification information is changed to true after a certain period of time according to the counting result of the idle mode terminal. Accordingly, the contents of the most recent message among the MBMS SA messages received for a certain period of time are accepted as MBMS control information generated by the MBMS event. By doing so, the terminal can maintain the correct MBMS control information corresponding to the MBMS event that has occurred and also wake up and decode at a given point in time to receive MBMS SA and MBMS RB INFO messages every designated DRX cycle unless the terminal changes the cell. There is no need to perform the operation.

If the MBMS SA message has not been received a predetermined number of times or the predetermined cycle has not been exceeded, the process proceeds to 921 where the MBMS service identifier (ID) requested by the mobile station receives the MCCH channel after receiving the PICH. And check whether it is included in the first MBMS SA message received. In this case, if the MBMS service identifier (ID) does not exist in step 921, the process proceeds to step 922 to determine whether or not the MBMS service has already been session started. The process of checking whether the MBMS service is a session started service or not can be confirmed using service context and variables maintained by the terminal. If the service is not already started at step 922, it is not an event occurrence for the MBMS service requested by the terminal, and therefore, goes to 923 and ignores the MBMS SA message and no longer receives the MCCH. On the other hand, if the MBMS service has already been started in step 922, go to 932 and perform an operation for session stop. That is, the MBMS service is started in the cell, the MBMS paging is detected through the PICH channel, and the MBMS SA message is received through the MCCH channel, but the absence of the MBMS service identifier (ID) indicates that a session stop event has occurred. To indicate.

If the MBMS service identifier (ID) is present in the first received MBMS SA message at 921, the PTM identification information is checked. If the PTM Indication is false in 931 and the terminal is in idle mode in 941, the UE performs an operation for the RRC connection in 951 and proceeds to 911. Even though the PTM identification information is true in step 931, when the recounting MBMS event occurs, the information is undetermined information that may be changed after a certain time, so the process proceeds to 911 and repeatedly performs the operation for a predetermined period of time.

That is, if the terminal has received a predetermined number of MBMS SA messages or has exceeded a predetermined cycle at 911, the terminal proceeds to 912. In step 912, it proceeds to step 961 to determine what value the PTM identification information of the most recently received MBMS SA message of the MBMS SA messages received during the DRX cycle determined in step 911 is. At this time, if the PTM identification information is true, the MBMS RB INFO message is received through the MCCH at the time determined in step 971 to receive the PTM RB information. On the other hand, if the PTM identification information is not true, the flow proceeds to 962 to receive PTP RB information through an RRC message. During the predetermined number of MBMS SA reception or a predetermined DRX cycle at 911, the RNC sets an MBMS control message due to the occurrence of the MBMS event, for example, when counting is required when a session start event occurs, the PTM RB is determined and the MBMS SA is determined. You must ensure time to notice the message.

Accordingly, the terminal may act as a message based on MBMS paging and MBMS events through the latest MBMS SA message. Accordingly, except when the UE changes the cell, the UE receives only the MCCH channel when the MBMS event occurs in the cell, and continuously receives the MCCH to receive the previous MBMS paging message and the control message based on the MBMS event. No need to receive In addition, it is not necessary to receive the MBMS SA message and the MBMS RB INFO message transmitted periodically.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative of the disclosed invention will be briefly described as follows. In the present invention, the terminal receives a call message transmitted from the RNC at a call-only time point, The MCCH according to the MBMS service is received through the call cause value included in the call message and identification information according to the number of terminals. In addition, the terminal wakes up at the time of transmission of MBMS SA and MBMS RB INFO messages periodically transmitted from the RNC and receives the MCCH according to the MBMS service. Accordingly, the terminal does not continuously receive the MCCH, thereby reducing the overhead caused by the reception and has the effect of saving power consumption.

1 is a diagram illustrating a structure of a 3GPP mobile communication network for a multicast multimedia broadcasting service (MBMS) to which the present invention is applied.

2 is a diagram illustrating a procedure of providing an MBMS service to which the present invention is applied.

3 is a diagram illustrating a process of transmitting an MBMS control message according to the prior art.

4 is a diagram illustrating a process of transmitting MBMS control information according to the first embodiment of the present invention.

5 is a diagram illustrating an operation flow of an RNC according to the first embodiment of the present invention.

6 is a view showing the operation of the terminal according to the first embodiment of the present invention.

7 is a diagram illustrating a process of transmitting MBMS control information according to a second embodiment of the present invention.

8 is a flowchart illustrating the operation of the RNC according to the second embodiment of the present invention.

9 is a view showing the operation of the terminal according to the second embodiment of the present invention.

Claims (5)

In the mobile communication system including one or more terminals, cells in which the terminals are located, a wireless network control device for managing one or more cells, and a wireless network control device for providing a broadcast service for each service through the cell, In the method for transmitting a control message reception time to provide the broadcast service in a wireless network control device, Setting, by a wireless network controller, identification information according to the number of activation terminals requesting the broadcast service indicating a reception time of the control message and a call cause value according to the broadcast service; And transmitting a call message including the identification information and the call cause value to be received by the terminal at a call-only time point of the terminal. The method of claim 1, The call message further comprises the broadcast service identifier. The method of claim 1, And if the identification information is set to a predetermined value, the terminal does not receive the control message including radio bearer information to receive the broadcast service until a next call-only time. And if the identification information is not set to a predetermined value, continuously receiving the control message including radio bearer information to receive the broadcast service. In the mobile communication system including one or more terminals, cells in which the terminals are located, a wireless network control device for managing one or more cells, and a wireless network control device for providing a broadcast service for each service through the cell, A method for receiving a control message including radio bearer information by a terminal, the method comprising: Receiving, by the terminal, a call message including identification information according to the number of terminals transmitted from the radio network controller at a call-only time and a call cause value according to the broadcast service; And after receiving the control message through the identification information and the call cause value according to the broadcast service, receiving the control message at the corresponding time.