KR20050081836A - Method which makes system effectively transmit paging information to an ue that receives an signaling related to multimedia broadcast/multicast service in a mobile communication system - Google Patents

Abstract

The present invention relates to a multicast multimedia broadcast service (hereinafter referred to as an 'MBMS service'), and more particularly to a calling method for providing the MBMS service.

The present invention informs the presence of the call message to transmit a call message for notifying whether the start of the session of the MBMS service or the control information related to the MBMS service to a plurality of UEs subscribed to a particular MBMS service. The present invention provides a method of transmitting a paging indicator.

The transmission of the call indicator used in the current standard has a problem that the UE which does not have the call message also calls and causes the UE to consume battery. In addition, the call message has a problem of bringing unnecessary burden on the Iub interface.

Therefore, the present invention minimizes the number of times the RNC transmits from the RNC to the Node B using paging duration in transmitting the call indicator, and enables the Node B to repeatedly transmit the call indicator. In addition, the present invention provides a method for transmitting a call indicator from the RNC to Node B using the NBAP control message in order to ensure the reliability of the call indicator transmission.

Description

{Method which makes system effectively transmit Paging information to an UE that receives an signaling related to Multimedia Broadcast / Multicast service in a mobile communication system}

The present invention relates to a multicast multimedia broadcast service (hereinafter referred to as an 'MBMS service'), and more particularly to a calling method for providing the MBMS service.

Due to the development of communication technology, services provided by a mobile communication system using a wideband code division multiple access (CDMA) scheme are not only conventional voice services but also packet data and circuit data. Packet service communication that transmits a large amount of data, such as, etc., and multimedia broadcasting / communication that can also transmit multimedia services. 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 UEs) 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 multiple 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, and text. The MBMS service is a service that can simultaneously provide audio data and video data according to the multimedia transmission format, and requires a large amount of transmission resources. In the case of the MBMS service, since the same data must be transmitted to a plurality of cells in which users are located, one-to-one (Point to Point: 'PtP') or one-to-many depending on the number of users located in each cell : Hereinafter called 'PtM') Connection is made.

1 is a diagram schematically illustrating nodes participating in providing an MBMS service in a mobile communication network.

Referring to FIG. 1, UEs 161, 162, 163, 171, and 172 refer to terminal devices or subscribers capable of receiving MBMS services, and are referred to as cell 1 160 and cell 2 170. ) Is a base station apparatus that wirelessly transmits MBMS related data to subscribers, that is, controlled by Node B. 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 an MBMS service. Control the established wireless channels. 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') network such as the Internet by a service packet wireless service support node (hereinafter referred to as 'SGSN') 130. Is connected. Communication between the RNC 140 and the PS network is made 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 (called 'BM-SC') 110 and the SGSN 130, and provides a gateway packet radio service. 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.

Meanwhile, the RNC 140 is connected to a circuit switched 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.

MBMS data streams are delivered to UEs 161, 162, 163, 171 and 172 via the transport network 120, SGSN 130, RNC 140, Node B and cells 160, 170.

Although not shown in FIG. 1, there may be multiple SGSNs for one MBMS service and multiple RNCs for each SGSN. Each SGSN is an RNC 140, and each RNC performs selective data transmission to each of a plurality of cells, and for this purpose, a list of nodes to which a data stream should be delivered (that is, SGSN is a list of RNCs and an RNC List) and the like, and selectively transmit MBMS data only to the stored nodes later.

In order for UEs to access a network and receive a service, a context, which is a set of information required to provide a corresponding service between UEs and network nodes, must be created. Typically, the context includes a UE context and a mobility management (hereinafter referred to as 'MM') context.

First, the RNC creates a UE context for UEs after establishing a Radio Resource Control (RRC) connection. The UE context is composed of basic information such as UE identifier, UE location information, UE RRC status information, radio resource information allocated to the UE, and is managed by the RNC while the RRC connection is active.

The MM context is for managing the location of the UE in the core network (including SGSN 130 and GGSN (not shown)). In order for the UE to receive the PS service, first, the MM context of the UE must be generated in the SGSN 130 and the GGSN through a GPRS attach procedure. In particular, the MM context of the SGSN 130 may include international mobile subscriber identity (hereinafter referred to as IMSI), temporary mobile subscriber identity (hereinafter referred to as P-TMSI), and international mobility. Routing with UE identifiers such as device identification (International Mobile Equipment Identity, hereinafter referred to as "IMEI"), Mobile Subscriber Integrated Switched Data Network (ISDN) Number (hereinafter referred to as "MS-ISDN") Location information such as Routing Area (hereinafter referred to as 'RA') and Service Area Code (hereinafter referred to as 'SAC'), authentication / encryption related information, billing information and discontinuous reception parameters (Discontinuous Reception Parameters) , Hereinafter, referred to as 'DRX parameter').

2 is a diagram illustrating a procedure between a subscriber station and a network for an MBMS service. Here, the BM-SC 306 communicates with the UE 302 via the RNC 304. The RNC 304 also communicates with the BM-SC 306 via SGSN (not shown). Although only one RNC 304 and only one UE 302 are shown here, of course, the same procedure is applicable to multiple UEs and multiple RNCs that wish to receive MBMS service.

Referring to FIG. 2, a service registration (SUBSCRIPTION) step 310 is a process in which a user who wants to receive MBMS service, that is, a UE 302, registers with a BM-SC 306 which is a service provider. In the service registration step 310, the service provider BM-SC 306 and the user UE 302 exchange basic information related to charging or service reception.

In the service announcement (ANNOUNCEMENT) step 320, 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 306, service start time, and duration are recognized. Here, the MBMS service identifier is composed of a multicast address and an access point name (hereinafter, referred to as 'APN').

Nodes located between the BM-SC 306 and the UE 302, that is, the RNC 304, the SGSN, the transport network, etc., are connected with the UE 302 in the ANNOUNCEMENT step 320. Recognize nodes connected to the UE 302. 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 302 having acquired the MBMS service basic information performs a service joining step 330 to receive desired MBMS service data. In the JOINING step 330, the UE 302 transmits at least one desired MBMS service identifier among the MBMS service identifiers obtained through the ANNOUNCEMENT step 320 to the BM-SC 306. To pass.

The NOTIFICATION step 340 is a step of calling the UE 302 to notify that the MBMS service requested by the UE 302 will start soon in the JOINING step 330. In the NOTIFICATION step 340, group paging is performed for a plurality of UEs joining the MBMS service.

RADIO RESOURCE ALLOCATION step 350 is the step of actually allocating a radio resource between the UE 302 and the RNC 304 to provide the MBMS service and informing the relevant nodes of the information. . In step 350, the RNC 304 provides a point-to-multipoint mode based on information on the number of UEs belonging to each lower cell and a radio resource management function. It may be called 'PTM') or one-to-one transmission mode (Point-to-Point).

In a DATA TRANSFER step 360, actual MBMS data is transmitted to the UE 302 via the RNC 304. In step 360, for example, if there is a need to change a ciphering key for the MBMS service, the RNC 304 sends a new encryption key to all UEs receiving the MBMS service. To pass.

When the MBMS service is terminated, the allocated radio resource is released in the radio resource release step 370 and the UE 302 is notified that the MBMS radio resource is released. Although not shown, the UE 302 may voluntarily stop receiving the MBMS service and stop receiving the MBMS service while receiving the MBMS service (ie, in operation 350).

In order to proceed with the MBMS service, a call message for notifying the existence of control information, such as starting a session or transmitting a control message according to the MBMS service, must be transmitted to a plurality of UEs subscribed to the same MBMS service. In order to indicate the existence of a paging message, a paging indicator must be transmitted in advance. The call indicator is for multiple UEs.

However, using the method of transmitting call indicators for individual UEs used in the current standard introduces an unnecessary burden on the IuB interface. In addition, the call message is a group call message, which causes a specific UE to recognize the call message for the unsolicited MBMS service. Thus, there is a problem that does not guarantee battery consumption of the UE.

Accordingly, an object of the present invention for solving the above problems relates to a multicast multimedia broadcasting service (hereinafter referred to as an MBMS service), and to provide a calling method for providing the MBMS service. In providing.

Another object of the present invention is to provide a method in which a RNC can set necessary parameters in a method of calling a mobile communication system providing the MBMS service.

Still another object of the present invention is to provide a method of configuring a physical channel to transmit a call indicator in providing a method of calling a mobile communication system providing the MBMS service.

It is still another object of the present invention to provide a method for updating main parameters of a physical channel to transmit a call indicator in a mobile communication system supporting an MBMS service.

It is still another object of the present invention to provide a method for minimizing the number of transmissions by using periodic information when the RNC transmits a call indicator to a Node B in a mobile communication system supporting an MBMS service.

It is still another object of the present invention to provide a method of using an NBAP control message to ensure reliability in transmitting a call indicator to a Node B by a RNC in a mobile communication system supporting an MBMS service.

In accordance with a first embodiment of the present invention for solving the above-described problems, one or more user terminals, cells in which the user terminals are located, and a wireless network controller managing one or more cells are multicasted through the cells. In a mobile communication system including a wireless network controller for providing a multimedia broadcast / multicast service (MBMS) service, the wireless network controller is a method for efficiently transmitting control information according to the broadcast service, the wireless network controller Transmitting, to the base station, a control message including information on a notification indicator corresponding to an MBMS call group and time information on which the information on the notification indicator is transmitted, and the base station corresponding to the message; Setting and transmitting a response message to the wireless network controller; It characterized in that the base station transmits an indicator channel group including the indicator through an iterative physical channel is set according to the time information to the user terminal. According to a second embodiment of the present invention for solving the above problems, one or more user terminals, cells in which the user terminals are located, and a wireless network controller managing one or more cells are multicasted through the cell. In a mobile communication system including a wireless network controller providing a multimedia broadcast (Multicast Service) service, the wireless network controller is a method for efficiently transmitting control information according to the broadcast service, the wireless network controller is a broadcast Transmitting a notification information update request message including a notification branch indicating presence or absence of control information according to a service and a period which is time information transmitted to the notification indicator to the base station, and the base station transmits a notification information update request message to the base station; Correspondingly, a notification information update response message is sent to the radio network controller. Transmitting a notification indicating that a physical channel for transmitting the notification indicator is configured, and the base station controller repeatedly transmits the notification indicator to the user terminal during the period through the configured physical channel.

According to a third embodiment of the present invention for solving the above-mentioned problems, one or more user terminals, cells in which the user terminals are located, and a wireless network controller managing one or more cells are provided for each service through the cell. In a mobile communication system including a wireless network controller for providing a broadcast service, in a method for efficiently transmitting control information according to the broadcast service by the wireless network controller, to set an indicator channel in which the wireless network controller is a physical channel Transmitting, to the base station, a common transport channel setup request message including a maximum number of notification indicators that can be contained in the indicator channel and a period indicating a time for continuously transmitting the notification indicator, and the base station responds to the request message. Physical transport via common transport channel setup response messages It is set to inform the process that the RNC and further characterized in that the base station and to distinguish the set physical channel identification information, and transmitting the period and the notification indicator to the user terminal.

According to a fourth embodiment of the present invention for solving the above-described problems, one or more user terminals, cells in which the user terminals are located, and a wireless network controller managing one or more cells are provided for each service. In a mobile communication system including a wireless network controller for providing a broadcast service, in a method for a user terminal receiving control information according to the broadcast service, distinguishing a physical channel set by the base station from a base station through a system information block Receiving identification information and a notification indicator indicating whether there is a call according to the broadcast service, and whether or not there is control information according to the broadcast service distinguished from a call indicator indicating whether control information exists at a call-only time Identifying a notification indicator indicating a message; If it is confirmed through the indicator that the control information according to the broadcast service is characterized in that for receiving the control channel according to the broadcast service.

In accordance with a fifth embodiment of the present invention, a wireless network controller managing one or more user terminals, cells in which the user terminals are located, and a wireless network controller managing one or more cells are provided for each service. In a mobile communication system including a wireless network controller for providing a broadcast service, the wireless network controller is to update the control information according to the broadcast service, the wireless network controller to determine the presence or absence of the control information according to the broadcast service Transmitting a common transport channel reset request message including a changed call cycle of a notification indicator to the base station, and indicating that the physical channel is reset in response to the request message by the base station through the common transport channel reconfiguration response message; Characterized in that it comprises a process of notifying to the wireless network controller All.

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

In the following description, several representative embodiments of the present invention for achieving the above-described technical problem will be presented.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

The present invention provides a method for more efficiently transmitting a call indicator indicating that a call message exists to a plurality of UEs subscribed to the MBMS service.

In general, the mobile communication system transmits a paging indicator (hereinafter, referred to as a 'PI') indicating that the call message exists when a call message exists to arbitrary UEs and after receiving the PI. The operation of the UE is defined as follows.

In order to prevent unnecessary consumption of the battery, the UE receives a PICH signal at a predetermined time, Paging Occasion (hereinafter, referred to as' PO '), and a corresponding paging signal (Paging Instance, hereinafter') of the received PICH signal. If PI is set to "1", it confirms that the call exists. At this time, the start time of the PO is determined by an identifier of each UE, and the repetition time of the PO may be a value determined in a core network or a UMTS Territorial Radio Access Network. That is, when the PI exists, the UE is called a paging channel (hereinafter referred to as 'PCH'), which is a transport channel transmitted on a secondary common control physical channel (hereinafter referred to as 'S-CCPCH'). ), And determines whether a paging message for the UE has been transmitted.

In other words, a two-stage process of PI and call message is used to inform the existence of control information for the UE, and the UE, which is convinced that the control information exists through the process, is later transmitted through the S-CCPCH. Control information is received.

As described above, the method of notifying the current UE that the control information is present uses a dedicated calling method for the UE to receive the control information. Therefore, even when transmitting the PI, since different UEs are called every moment, the contents of the PI transmitted to the PICH are changed every time.

However, as described in the prior art, since the MBMS is a service for a plurality of UEs, and the control information for the MBMS is also for a plurality of UEs, the PI indicating that the control information of the MBMS exists is determined by the MBMS. Repeated transmission for a certain period so that all UEs to receive can receive.

A call process for notifying the existence of the MBMS control information, and operations of the UE and the UTRAN will be described below.

That is, in the present invention, the PI indicating that the control information is present to the conventional UE, and the NI indicating that the control information related to the PICH and MBMS to which the PI is transmitted exist and the control information related to the MBMS is present. The MICH attempts to distinguish the physical channel. Herein, a call indicator indicating that there is control information related to the MBMS is called a notification indicator (hereinafter, referred to as 'NI'), and the physical channel to which the NI is transmitted is an MBMS Notification Indicator Channel (MBMS Notification Indicator Channel). Hereinafter referred to as 'MICH'.

In this regard, the UE supporting the MBMS service checks the NI at the PO, which is the time when the receiver is turned on to receive the PI, and whether there is a call corresponding to the corresponding MBMS service requested by the UE to receive the service. At the same time, discrimination is made. That is, the reason for checking the NI together in the PO is to prevent unnecessary power consumption of the UE by turning on the receiver several times in order to receive the PI and NI.

At this time, if the UE confirms that there is a call for control information for the MBMS service through the NI, it is referred to as a forward access channel (hereinafter referred to as 'FACH') which is a transport channel transmitted through S-CCPCH. Receives an MBMS Control Channel (hereinafter referred to as 'MCCH') for transmission of control information for the MBMS mapped to). That is, the UE confirms that there is control information for the requested MBMS through the NI.

Here, the method for confirming the existence of the control information for the MBMS is a method of receiving and confirming the call message via the MCCH in the same manner as the conventional call method, and directly receiving the MBMS control information to receive the MBMS control information is the UE A method of directly checking whether the control information corresponds to the MBMS that the user wants to receive a service may be used.

As described in the method of notifying that there is control information for the MBMS, UEs that want to receive the MBMS turn on the receiver in their PO to identify the NI. Accordingly, the RNC repeatedly transmits the NI for a predetermined period of time so that all UEs can receive the NI in transmitting control information for any MBMS.

In order to transmit the NI for the MBMS, the RNC uses the last 12 bits which is an unused area of the PICH or uses the newly defined MBMS Notification Indication Channel (hereinafter referred to as 'MICH'). In general, the physical channel characteristics of the PICH may transmit 300 bits for 10 ms, and use only 288 bits among the 300 bits. Therefore, the RNC transmits the NI on the last 12 bits, which is an unused region of the PICH.

Alternatively, the NI may be transmitted through the MICH. The MICH may have the same physical characteristics as the PICH. In this case, the RNC may transmit the NI using all 300 bits of the MICH.

Whether the PICH or the MICH is used is set in the RNC by a network operator that is determined by the RNC or performs an operation & management by using a radio resource management function (hereinafter, referred to as 'RRM'). It is possible. When using the RRM function, the RNC may determine whether to use the PICH or the MICH in consideration of the use of radio resources of the cell and the number of MBMS sessions in progress.

In addition, when the MICH is used, all 300 bits constituting the MICH frame are all used to transmit the NI, so that a larger number of MBMS services can be simultaneously called. In this case, in order for the RNC to transmit an NI according to a specific MBMS to a UE through a cell managed by the RNC, a procedure of configuring a PICH or a MICH, which is a common physical channel, must be preceded in the corresponding cell.

3 illustrates a control message transmission and reception process between an RNC and a Node B for configuring a PICH or a MICH. Before explaining FIG. 3, the network structure, that is, the multicast / broadcast-service center (BM-SC) and the gateway packet described in the present invention will be described below. It is assumed that the connection structure of the wireless service support node (GGSN) (hereinafter referred to as 'GGSN'), the SGSN, the RNC, and the UE has the structure described with reference to FIG.

Referring to FIG. 3, the RNC 403 configures a physical channel for transmitting NI to the Node B 402 through a common transport channel setup (steps 410 and 411).

In this regard, Table 1 below shows a case in which an unused 12 bit of PICH is used as a physical channel to transmit NI, that is, MBMS service is supported in an existing common transport channel setup request. Represents a parameter to be added. The tables described below do not describe the overall parameters of the message but only the parameters added according to an embodiment of the present invention.

The NI mode of Table 1 indicates the number of MBMS call groups included in the unused 12 bits of the PICH.

For example, when the NI mode is set to 3, it indicates that there are three MBMS call groups in total. When there are three MBMS call groups as described above, when the RNC sets one MI to 1 and transmits it to Node B, Node B sets the four bits corresponding to the NI to 1 out of the unused 12 bits of the PICH frame to 1. Set to send to the UE.

For reference, the MBMS call group indicates a set of one or more MBMS services to which the same notification indicator is assigned. In addition, an independent notification indicator can be allocated to each MBMS service. Accordingly, when the number of MBMS call groups becomes 1, the MBMS paging group ID may be determined using a corresponding MBMS service identifier. That is, the notification indicator may be allocated for each MBMS service identifier.

The paging duration is to ensure that all UEs wishing to receive the MBMS service belonging to the same MBMS call group receive the NI, even though multiple UEs receive the NI in different periods of PO and DRX periods. This is the period during which Node B must continuously transmit NI. In Table 1, the paging duration may be set differently for each MBMS call group.

In this case, the MBMS paging group ID and the paging duration are configured in one pair, and a list having a length corresponding to the maximum number of MBMS paging groups can be generated. Alternatively, paging group IDs may be removed from Table 1, MBMS paging group identifiers may be sorted in ascending order, and a list having only the paging duration may be generated in a fixed order.

In this case, when all call groups have the same call period, the common transport channel setup request message includes one paging duration, not a list.

On the other hand, Tables 2a and 2b below describe a case where a newly defined MICH is used as a physical channel to transmit NI. In this regard, a parameter added to an existing common transport channel setup request will be described.

The MICH mode of Table 2a and Table 2b includes the same meaning as the NI mode of Table 1. That is, the MICH mode indicates the number of MBMS call groups included in the MICH.

In addition, the paging duration of the <Table 2a> is also the same as the <Table 1>. That is, it is a period during which Node B continuously transmits NI to UEs belonging to the same MBMS call group to receive the corresponding MBMS service. The paging duration may be set differently for each MBMS call group.

Modulation Period of Table 2b is a term indicating the common call period when the same call period is provided for each MBMS call group or MBMS service. In order to ensure that a UE receiving a particular MBMS service receives a call for that service, it is not possible for Node B to add or exclude calls for a new service within the change period.

Common Physical Channel IDs of Tables 2a and 2b are channel identifiers for identifying the MICH. Frequency Division Duplex (FDD) Downlink (DL) Channelization Code Number indicates the number of the channelization code assigned to the MICH. MBMS notification indicator channel power (MICH Power) represents the maximum amount of power available to the MICH.

In addition, in Table 2b, each MBMS service to be called is grouped into MBMS call group units, that is, an MBMS call group ID is set to transmit an NI, or a service identifier for each MBMS service. You can configure NI with (Service ID) and send it to Node B.

Referring to FIG. 3 again, the RNC 403 transmits a Node B (Common Transport Channel Setup Request) message including a NI mode or MICH mode and a paging duration parameter in step 410. 402). In step 411, the Node B 402 successfully configures a physical channel to transmit the NI according to MBMS to complete the common transport channel setup.

In step 415, the Node B 402 updates System Information Block (hereinafter, referred to as 'SIB') information related to PICH or MICH in connection with transmitting the NI from the RNC 403. In step 417, the Node B 402 broadcasts the updated SIB information through the step 415 to the entire cell at a designated time. In step 417, the SIB information includes MBMS NI Indicator, NI Mode, or MICH Mode.

In this case, the MBMS NI Indicator is an indicator indicating whether to use a 12-bit unused region of the PICH or a newly defined MICH for the MBMS call. The NI mode means the parameters described in Table 1 above. The MICH mode is identical to the parameters described in Tables 2a and 2b. The UE acquiring the SIB information through the step 417 may periodically monitor the unused 12 bits or the MICH of the PICH.

Here, the paging duration of one MBMS call group is determined as the longest value among the DRX cycles of UEs belonging to the same MBMS call group. Therefore, the paging duration is not a fixed value but a value that can be changed while the MBMS service is active.

FIG. 4 illustrates a process of changing unused 12 bits of PICH or Paging Duration parameter of MICH initially set up through the process as shown in FIG. 3.

Referring to FIG. 4, the RNC 453 uses a common transport channel reconfiguration procedure (steps 460 and 461) to configure a physical channel (unused 12-bit or MICH of a PICH) configured in the Node B 452. Change the paging duration of). That is, in step 460, the RNC 453 transmits a Common Transport Channel Reconfiguration Request message including a paging duration for each MBMS call group to be changed to the Node B 452. .

In this case, as a method of transmitting the paging duration, a method of clearly transmitting the MBMS call group identifier and the call period as a pair is transmitted firstly and secondly, the MBMS call group. There is a method of transmitting by setting paging duration sequentially.

The first method of changing the MBMS call group identifier and the call period into one pair is effective when the MBMS call group identifier is to change the paging duration of most MBMS call groups at the same time. On the other hand, the second method is efficient when only the paging duration of a specific MBMS group is to be changed among MBMS call groups. The third method, optimized with respect to the first and second methods, can enable the RNC to adaptively use the first and second methods.

The third method may be equally applied to the common transport channel setup request message shown in Table 1, Table 2a, and Table 2b. When using the third optimized method, an example of the Common Transport Channel Reconfiguration Request message is shown in Table 3 below.

Table 3 below shows only the case of MICH. In this case, the unused 12 bits of the PICH also have the same message format as shown in Table 3 below.

Definition of each parameter of Table 3 will be omitted in the description of Table 1, Table 2a, Table 2b.

As shown in Table 3, the RNC may optionally request one of the first and second methods to request Node B to change the call period using the Choice Paging Duration parameter. have. Although not shown according to the second method, the same paging duration may be set for all MBMS call groups.

In this case, when the RNC wants to change the NI mode or the MICH mode set to 12 bits or the MICH which is an unused area of the PICH, the common transport channel reconfiguration procedure cannot be used. In this case, to reconfigure the common transport channel through the common transport channel delete procedure, a common transport channel setup must be newly performed to set the changed NI mode and the MICH mode.

After the Common Transport Channel Setup procedure, it is obvious that the SIB update process is performed as shown in FIG. 3.

3 and 4, Node B repeatedly prepares to transmit NI to a specific MBMS group during a paging duration, and the UE also acquires information about the physical channel to receive the NI through SIB. Ready to receive.

Accordingly, the RNC sends a Notification Indicator to the UE to signal that the MBMS session has started or to indicate that there is an aperiodic MBMS message transmission over the MCCH.

5 is a diagram illustrating a message transmission / reception process between an RNC and a Node B for transmitting a notification indicator corresponding to a corresponding MBMS call group according to a second embodiment of the present invention.

Here, the NI is repeatedly transmitted during the paging duration set through step 410 of FIG. 3 or step 460 of FIG. 4. The method in which the RNC transmits the values of NIs to the Node B every PICH or MICH frame during paging duration is inefficient.

Accordingly, in FIG. 5, the RNC transmits an NI value to the Node B at the start time, and the Node B repeatedly configures the PICH and MICH frames for a preset paging duration and transmits the same to the UE. In this method, if the node B does not receive the NI value transmitted by the RNC at the start time due to an error on the Iub interface, the configuration of a large number of PICH and MICH frames occurs during the paging duration. Is essential.

Accordingly, in FIG. 5, instead of a method of transmitting NI using a frame protocol of a user plane, the NI is represented using a Node B Application Protocol (NBAP) message of a control plane. Provide a way to send.

Also, in the present invention, a new NBAP message for transmitting the NI includes a notification information update request message transmitted by the RNC to Node B and a response message transmitted by the Node B to the RNC in response to the request message. Defines a Notification Information Update Response message.

The Notification Information Update Request / Response message may be transmitted through an existing Node B control port or through a newly defined MBMS control port according to the present invention. . The Node B control port is used to exchange an NBAP message for managing a cell not related to a specific UE between one RNC and one Node B. On the other hand, the newly defined MBMS control port is used to send and receive information on the notification indicator (Notification Indication) between the one RNC and one Node B in the NBAP message.

Referring to FIG. 5, the RNC 503 transmits a Notification Information Update Request message to the Node B 503 in step 510 to allow the Node B to configure a PICH frame or MICH frame. It is apparent that the physical channel is configured through the process of FIG. 3 to perform step 510.

The Notification Information Update Request message of step 510 includes NI information to be included in a PICH or MICH frame and optionally paging duration information to be changed. Here, two methods may be used to represent the NI information.

Method 1: Using a Bitmap

Allocate one bit for each MBMS call group. Thus, a bitmap consisting of total NI mode bits is constructed. If the bit is set to 0, the corresponding NI is not transmitted. If the bit is set to 1, the NI is continuously transmitted during the preset call cycle.

Second Method: Using Index

MBMS call groups are listed sequentially and numbered in ascending order, which is called paging group identification. If the paging group ID is included, the corresponding NI is continuously transmitted for a preset call period. If the paging group ID is not included, the corresponding NI is not transmitted. In this case, two MBMS services belonging to the same call group are called at the same location every frame within a modification period.

In this regard, Tables 4A and 4B below show examples of the Notification Information Update Request message.

Each parameter of Tables 4a and 4b has already been described and will be omitted. In particular, when transmitting the NI, the RNC uses a Choice NI Information To Be Configured parameter as shown in Tables 4a and 4b to optionally select one of the bitmap and the index. It can be configured to send to Node B.

In addition, as shown in Tables 4a and 4b, a paging duration parameter is optionally included to transmit the notification information update request message, thereby calling each MBMS call group. You can also change the Paging Duration.

In this regard, Table 4b shows that only the difference between the MBMS service group already in progress and the MBMS service group to be newly called can be included in the notification information update request.

In Table 4b, if there is an MBMS call group that was previously transmitted before the notification information update request, the new notification information update request is compared with the call group that has already been transmitted. delta list). In this case, an MBMS service ID may be used instead of the MBMS call group identifier.

In this case, when the bitmap is used, Iub wired resources can be used more efficiently because all MBMS call groups are to be simultaneously called. On the other hand, when the index is used, the smaller the number of MBMS call groups to be called at the same time, the more efficiently the Iub wired resource can be used. Accordingly, the RNC can efficiently use the Iub wired resource by adaptively selecting the case of using the bitmap and the case of using the index.

In addition, when using the bitmap, the RNC includes the paging duration information in the common transport channel setup request message or a notification information update request message. It is also possible to transmit to Node B without making a request. That is, similar to the bitmap signaling for the PICH signaling of the existing Rel99, the RNC transmits the updated bitmap to Node B both at the time when the NI changes from 0 to 1 and when the NI changes from 1 to 0.

At this time, the Node B receives the Notification Information Update Request message in step 510 and stores the configuration information for the MICH frame in the same manner as above, and in step 511, the Notification Information Update Response. Response) Reply with a message. That is, Node B receiving the Notification Information Update Request message, starting from the connection frame number (hereinafter referred to as CFN) time point of the message in step 512, is called in advance for each MBMS call group. During paging duration, bits corresponding to NI of consecutive MICH frames are repeatedly set to 1 and transmitted.

The paging duration may be the common transport channel setup request message of step 410 of FIG. 3 or the common transport channel reconfiguration request of step 460 of FIG. 4. The message is set in advance for each call group. Alternatively, in step 510 of FIG. 5, a notification information update request message may be set.

For example, if a particular NI is set to 1 at CFN = 0 and the paging duration of the MBMS call group corresponding to the NI is set to 200, bits corresponding to the NI of a PICH frame or a MICH frame are CFN. While the value is 0 to 199, all of 200 frames are set to 1 and transmitted to the UE. At this time, if the NI is set to 1 again at CFN = 20 and the paging duration is equal to 200, bits corresponding to the NI of the PICH frame or the MICH frame have CFN values of 20 to 219. During all 200 frames are set to 1 and transmitted to the UE.

Referring to FIG. 5, FIG. 6 illustrates a method of using an MBMS service ID instead of the MBMS call group identifier if a call is to be made at each position independent of each MBMS service for each frame. do.

Referring to FIG. 6, as an example, it is assumed that a certain UE joins a service in MBMS service 1. In this regard, it is assumed that the NI for the MBMS service 1 is transmitted at the third position in the first frame of the MICH and is transmitted at the seventh position in the second frame. In addition, NI for MBMS service 2 assumes that the first frame is transmitted at the third position and the second frame is transmitted at the fifth position.

At this time, if the MBMS service 1 and the MBMS service 2 belong to the same call group, any UE checks the NI at the third position of the first frame with respect to the MBMS service 1. However, in the second frame, we identify NI at the fifth position and NI at the seventh position. That is, there is a problem in that NI needs to be checked unnecessarily for MBMS service 2 belonging to the same call group.

Accordingly, in the present invention, when the NI for different MBMS services are transmitted through a newly configured MICH having a 300-bit length, that is, if the NIs are transmitted from independent locations for each MBMS service, Likewise, instead of using the MBMS call group identifier, NI is transmitted for each MBMS service ID.

7 is a flowchart illustrating the operation of the RNC shown in FIG. 3 according to an embodiment of the present invention.

Referring to FIG. 7, in step 600, if the RNC wants to configure PICH or MICH in a specific Node B, it first checks whether the Node B is capable of MBMS service. If the Node B is a NodeB capable of MBMS service, the flow proceeds to step 610 to select an appropriate common physical channel from the unused region 12 bits of the PICH or the MICH using a RRM function or a value preset by the O & M.

In step 620, the RNC determines parameters for configuring the common physical channel selected in step 610. Representative parameters include NI Mode or MICH Mode and Paging Duration. In step 630, the RNC configures a common physical channel for transmitting NI to Node B by performing a common transport channel setup procedure.

In step 640, the RNC updates the SIB information through the SIB update procedure so that the Node B can broadcast configuration information on the common physical channel set in step 630 to the UE.

8 is a diagram illustrating an operation of an RNC for performing the process illustrated in FIG. 4 according to an embodiment of the present invention.

Referring to FIG. 8, a paging duration of one MBMS call group is determined as the longest value among DRX periods of UEs belonging to the same MBMS call group. In this case, when UEs located in a cell managed by the RNC are changed by the mobility of the UE, the paging duration may be changed to the longest value among the DRX periods of the UEs. Alternatively, the RNC can change the DRX cycle by the RRM function.

If the maximum DRX cycle is changed in step 650 for the same reason as described above, the RNC changes the paging duration of the corresponding MBMS call group in step 660. Thereafter, in step 670, the RNC performs common transport channel reconfiguration to inform Node B of the changed paging duration so as to reconfigure the MICH.

9A is a first diagram illustrating an operation of an RNC performing the process illustrated in FIG. 5 according to an embodiment of the present invention.

Referring to FIG. 9A, when it is necessary to transmit an MBMS group call in association with an MBMS service in step 700, the RNC proceeds to step 710 to identify an MBMS call group corresponding to the MBMS service. In this case, when UEs located in a cell managed by the RNC are changed by the mobility of the UE, the paging duration may be changed to the longest value among the DRX periods of the UEs. At this time, the RNC may change the DRX cycle by the RRM function.

If the maximum DRX cycle is changed in step 720 for the same reason as described above, the flow proceeds to step 730 where the RNC changes the paging duration of the corresponding MBMS call group. If there is no change in the DRX cycle in step 720, step 730 is not performed. In step 740, the RNC can transmit using the bitmap or index using the NI transmission.

If the NI is transmitted using the bitmap in step 740, the flow proceeds to step 741. In step 741, the RNC allocates one bit for each MBMS call group to form a bitmap of a total of NI Mode bits. In this case, the bitmap is included in a Notification Information Update Request message and transmitted to the Node B. At this time, the NI corresponding to the MBMS call group to be called is set to 1.

On the other hand, if the NI is transmitted using the index in step 740, the flow proceeds to step 743. In step 743, the RNC checks whether to make a call according to the MBMS call group or each MBMS service, and according to the result, the RNC calls a paging group identifier corresponding to the MBMS call group to be called or an MBMS service to be called. Identifiers are included in the Notification Information Update Request message and transmitted to Node B.

The RNC, which has sent the Notification Information Update Request message to Node B through steps 741 and 743, receives a Notification Information Update Response from Node B in step 750 and receives notification information update response. Complete the update of.

9B is a second diagram illustrating an operation of an RNC for performing the process illustrated in FIG. 5 according to an embodiment of the present invention. This illustrates the operation when a delta list of the MBMS call group is available, including whether to call for MBMS service to be added or deleted in accordance with the present invention.

Referring to FIG. 9B, steps 760 through 770 are the same as the steps 700 through 741 of FIG. 9A.

At this time, when transmitting the NI using the index in step 768, the RNC determines in step 770 whether to use a delta list or an entire call group identifier. If the RNC decides to transmit to Node B a call group identifier corresponding to all call groups to be called without using the delta list, the flow proceeds to step 774.

On the other hand, if the delta list is to be used to transmit only the difference from the previously called group, the process proceeds to step 772. In step 772, step 774, and step 776, information corresponding to each format is configured. In step 778, the RNC transmits the NI information configured in steps 772, 774, and 776 to the Node B by including the notification information update request message. Thereafter, a notification information update response message is received from the Node B to complete updating of the notification information.

FIG. 10 is a view illustrating a Node B operation for performing the processes shown in FIGS. 3 and 4 according to an embodiment of the present invention.

Referring to FIG. 10, in step 800, Node B checks whether a message received from the RNC is a common transport channel setup request message. In this case, if the message is a common transport channel setup request, the process proceeds to step 810 and the NI Mode or MICH mode and paging duration, which are parameters necessary for configuring a PICH or MICH, are determined from the message. Confirm and save.

In step 813, Node B configures a common physical channel, PICH or MICH, based on the NI mode or MICH mode and paging duration parameters, and proceeds to step 815 for a common transport channel setup response. Response) Send a message to RNC.

On the other hand, if the message received from the RNC in step 800 is not a common transport channel setup request message, the flow proceeds to step 820. In step 820, Node B checks whether the received message is a Common Transport Channel Reconfiguration Request message. In this case, if the message is a common transport channel reconfiguration request message, the controller checks and stores the parameter to be updated in step 823.

Node B reconfigures a common physical channel, PICH or MICH, based on the updated paging duration, and transmits a common transport channel reconfiguration response message to the RNC.

FIG. 11 illustrates a Node B operation for performing the process illustrated in FIG. 5 according to an embodiment of the present invention.

Referring to FIG. 11, in step 900, Node B receives a MBMS Notification Information Update Request message from the RNC. In step 910, Node B checks whether the paging duration parameter has been changed through the message.

If the paging duration is changed in step 910, in step 920, Node B updates the paging duration of the corresponding MBMS call group or each MBMS service and reconfigures the PICH or MICH. Thereafter, in step 930, Node B extracts NI information from the message to form a PICH frame or MICH frame.

In step 940, a notification information update response is transmitted to the RNC to inform the RNC that the call cycle is normally changed. In step 950, Node B transmits the PICH frame or MICH frame configured in step 930 from the CFN indicated by the Notification Information Update Request message. That is, each bit of the MICH frame is repeatedly transmitted to the UE for a paging duration set for each MBMS call group or each MBMS service.

As described above, the present invention minimizes power consumption of a UE by checking a general call indicator and a call indicator according to the MBMS service at a call-only time in a mobile communication system providing an MBMS service. In addition, the wireless network controller efficiently transmits the signaling according to the MBMS service by transmitting a MBMS service group or a list including each MBMS service and a period in which the call is continuously transmitted to the base station through a control message. do.

That is, the number of messages transmitted from the radio network controller to the base station is minimized. Transmission of the call information using a control message has the effect of ensuring reliability. In addition, the base station repeatedly transmits the call information to the UE according to the period included in the message, thereby ensuring the reliability of the call information in the MBMS service.

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

2 is a diagram illustrating a procedure for a multicast multimedia broadcasting service.

3 is a signal flow diagram illustrating a control message transmission and reception process between an RNC and a Node B for configuring a MICH according to a first embodiment of the present invention.

4 is a signal flow diagram illustrating a control message transmission and reception process between an RNC and a Node B for updating an MICH set in accordance with a first embodiment of the present invention;

5 is a signal flow diagram illustrating a message transmission and reception process between an RNC and a Node B for configuring a MICH according to a second embodiment of the present invention.

6 is a diagram illustrating a configuration for transmitting an MICH using an MBMS service identifier according to the present invention.

7 is a flow chart showing the operation of the RNC according to FIG.

8 is a flow chart showing the operation of the RNC according to FIG.

9A is a first embodiment showing the operation of the RNC according to FIG. 5;

9b is a second embodiment showing the operation of the RNC according to FIG.

10 is a flowchart illustrating the operation of Node B according to FIG.

11 is a flowchart illustrating the operation of Node B according to FIG. 5.

Claims (18)

A mobile communication comprising one or more user terminals, a plurality of cells in which the user terminals are located, and a wireless network controller managing the cells and providing a multimedia broadcast / multicast service service through each cell. In the system for the wireless network controller to efficiently transmit the control information according to the MBMS service, Transmitting, by the radio network controller, a control message including information on a notification indicator corresponding to an MBMS call group and time information on which the information on the notification indicator is transmitted to a base station; Setting, by the base station, a physical channel in response to the message, and transmitting a response message to the wireless network controller; And the base station transmits an indicator channel including the notification indicator to a user terminal through a physical channel repeatedly set according to the time information. The method of claim 1, The wireless network controller transmits information about the notification indicator and the time information to a base station using a message of a control plane. The method of claim 2, The wireless network controller transmits the information about the notification indicator by using a bitmap method of allocating information about the notification indicator to one bit for each MBMS call group. The method of claim 2, The wireless network controller transmits the information about the notification indicator by using the index method for numbering and listing the MBMS call group. A mobile communication comprising one or more user terminals, a plurality of cells in which the user terminals are located, and a wireless network controller managing the cells and providing a multimedia broadcast / multicast service service through each cell. In the system for the wireless network controller to efficiently transmit the control information according to the MBMS service, Transmitting, by the radio network controller, a notification information update request message including a notification branch indicating presence or absence of control information according to the MBMS service and a period of time information transmitted to the notification indicator to the base station; In response to the base station transmitting a notification information update response message to the wireless network controller in response to the notification information update request message, informing that the physical channel for transmitting the notification indicator is configured; And the base station controller repeatedly transmits the notification indicator to the user terminal during the period through the configured physical channel. In a mobile communication system including one or more user terminals, cells in which the user terminals are located, and a wireless network controller managing one or more cells and providing a broadcast service for each service through the cell, the wireless network controller includes: In the method for efficiently transmitting control information according to the broadcast service, Transmitting, by a wireless network controller, a channel setup request message to a base station, wherein the channel setup request message includes a notification indicator indicating the presence or absence of control information according to the broadcast service and a period indicating a time for transmitting the notification indicator; Informing the radio network controller that the physical channel is established through a channel setup response message in response to the request message; Wherein the base station transmits identification information for identifying the set physical channel and the notification indicator to a user terminal. The method of claim 6, The wireless network controller configures a physical channel so that the base station transmits a notification indicator to the user terminal indicating whether there is control information according to the broadcast service through an unused area of a call indicator channel indicating presence of control information. Said method. The method of claim 6, And the radio network controller sets a physical channel such that the base station transmits a notification indicator indicating the presence or absence of control information according to the broadcast service to a user terminal through a notification indicator channel. The method of claim 8, The wireless network controller transmits a common transport channel setup request message to a base station, including a parameter indicating a channel code number to which the notification indicator channel is assigned. The method of claim 8, And the base station transmits identification information for distinguishing the set physical channel, the notification indicator, and the period to a user terminal through a system information block. In a mobile communication system comprising one or more user terminals, cells in which the user terminals are located, and a wireless network controller managing one or more cells and providing a broadcast service for each service through the cell, wherein the user terminal broadcasts the broadcast. In the method for receiving control information according to a service, Receiving identification information indicating a presence of a call according to the broadcast service and identifying information identifying a physical channel set by the base station from a base station through a system information block; Checking, by the user terminal, a notification indicator indicating presence of control information according to the broadcast service, which is distinguished from a call indicator indicating presence of control information at a call-only time; And if it is determined through the notification indicator that control information according to the broadcast service exists, the control channel according to the broadcast service is received. In a mobile communication system including one or more user terminals, cells in which the user terminals are located, and a wireless network controller managing one or more cells and providing a broadcast service for each service through the cell, the wireless network controller includes: In the method for updating the control information according to the broadcast service, Transmitting, by the radio network controller, a common transport channel reset request message including a changed call cycle of a notification indicator indicating whether there is control information according to the broadcast service to a base station; And the base station notifying the radio network controller through a common transport channel reset response message that the physical channel is reset in response to the request message. The method of claim 12, The wireless network controller transmits a common transport channel reset request message including the changed call period to the base station for each broadcast service group. The method of claim 12, The wireless network controller transmits a common transport channel reset request message including a list of mapping of the corresponding broadcast service identifier group and the changed call period to the base station. The method of claim 12, The wireless network controller includes the changed call period sequentially generated in order of the corresponding broadcast service identifier group in a common transport channel reconfiguration request message and transmits to the base station. The method of claim 1, And the wireless network controller can transmit a control message including only a difference between a previous MBMS call group and a new MBMS call group where a call occurs to the base station. The method of claim 2, The wireless network controller sets information on the notification indicator for each new MBMS call group in which the call is made and delivers the information to the base station. The method of claim 2, And the wireless network controller sets information on the notification indicator for each new MBMS service identifier where a call is made and delivers the information to the base station.