KR100933143B1 - Method and device for frequency selection / selection control for connected mode terminal in mobile communication system for multimedia broadcasting / multicast service - Google Patents

Abstract

Disclosed are a method and apparatus for moving terminals to a preferred frequency provided with a desired MBMS service in a mobile communication system for a multimedia broadcasting / multicast (MBMS) service. The connected mode terminal receives information indicating whether it can move to a preferred frequency of a desired MBMS service, and maintains or moves to the preferred frequency according to the received information. In this case, even if the received information is restricted from moving to the preferred frequency, the connected mode terminal may move to the preferred frequency of another MBMS service selected according to priority. This invention prevents the terminals from moving to the preferred frequency even though the traffic for the desired service of the connected mode terminals cannot be accommodated at the preferred frequency.

MBMS, FLC (Frequency Layer Convergence), PL (Preferred Layer), NPL (Non Preferred Layer), FLC disabled indication for connected mode UE, flag, bitmap

Description

TECHNICAL AND APPARATUS FOR SELECTING / SELECT CONTROLLING A FREQUENCY LAYER BY CONNECTED MODE UE IN A MOBILE TELECOMMUNICATION SUPPORTING MULTIMEDIA BROADCAST / MULTICAST SERVICE}

1 is a diagram illustrating a simplified configuration of a mobile communication system for an MBMS service.

2 is a diagram illustrating an example of a cell layer structure overlapping a region providing the same MBMS service.

3 is a diagram illustrating a procedure for determining whether FLC of a connected mode terminal is applied by an RNC according to an embodiment of the present invention.

4 is a flowchart illustrating an operation of a connected mode terminal to which a method of notifying whether FLC is applied as a flag of one bit is applied according to an exemplary embodiment of the present invention.

5 is a flowchart illustrating an operation of a connected mode terminal to which a method of notifying whether FLC is applied as a flag value of one bit according to another embodiment of the present invention is applied.

6 shows an FLC method according to the present invention.

The present invention relates to a Multimedia Broadcast / Multicast Service (hereinafter, referred to as an 'MBMS Service'). In particular, a connected mode terminal selects / selects a frequency for receiving an desired MBMS service. A control method and apparatus are provided.

Today, due to the development of communication technology, the services provided by a mobile communication system using a wideband code division multiple access (CDMA) scheme are not only a conventional voice service but also a large data transfer such as packet data. It is developing into packet service communication and multimedia broadcasting / communication capable of transmitting multimedia service. Accordingly, in order to support the multimedia broadcasting / communication, an MBMS service that provides a service to a plurality of user equipments from one or more multimedia data sources 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 FLC (Frequency Layer Convergence) for more efficient use of radio resources. The FLC does not provide a specific service through all frequencies superimposed in the same region, but provides the service only at one specified frequency, and moves a terminal to receive the service to the specified frequency. It is a scheme. The specified frequency is called a preferred frequency or a preferred frequency layer (PL) of a corresponding service, and the terminal performs an MBMS frequency selection procedure according to the FLC.

When the session of the MBMS service is started, a preferred frequency, that is, PL, for the MBMS service is determined by RRM (Radio Resource Management). In this case, since the idle mode terminal does not have associated traffic, even if the idle mode terminal joined to the MBMS service in another frequency band moves to the PL, it does not affect the system resource situation. Do not.

However, since the connected mode terminal receiving the dedicated traffic service has associated traffic, the PL may not receive the dedicated service according to the radio resource availability of the PL. That is, when the radio resource of the PL cannot accommodate the traffic of the connected mode terminal, the dedicated service of the connected mode terminal is interrupted.

The present invention provides a method and apparatus for frequency selection / selection control for FLC application or restriction of a connected mode terminal subscribed to an MBMS service.

The present invention provides a method and apparatus for frequency selection / selection control in order for a network to determine FLC application or restriction for a connected mode terminal in consideration of a radio resource state of a PL.

The present invention provides a frequency selection / selection control method and apparatus for transmitting information on whether FLC is applied for a connected mode terminal to the terminal.

The present invention provides a method and apparatus for selecting / selecting a frequency for the connected mode terminal according to information on whether FLC is applied to the connected mode terminal.

In a mobile communication system for a multimedia broadcasting / multicast service (hereinafter referred to as MBMS service) according to the present invention, a frequency selection method by a connected mode terminal located in a non-preferred frequency layer (NPL) includes a non-preferred frequency layer of the MBMS service. In the NPL, receiving a message including preferred frequency information related to a preferred frequency of an MBMS service from a radio network controller (RNC), and the preferred frequency information is used to determine the preferred frequency layer (PL) service restriction information. And optionally performing a frequency selection procedure according to whether or not it is included.

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In a mobile communication system for a multimedia broadcasting / multicast service (MBMS service) according to the present invention, a device of a terminal for selecting a frequency for an MBMS service in a connected mode includes an MBMS service from a radio network controller (RNC). A message receiving unit for receiving a message including preferred frequency information related to a preferred frequency of the UE, whether the terminal is located in a non-preferred frequency layer of the MBMS service, and the preferred frequency information includes preferred frequency layer (PL) service restriction information A service control unit for checking whether the terminal is located in the non-preferred frequency layer and if the preferred frequency information does not include the PL service restriction information, the service control unit moves to the preferred frequency to receive the MBMS service, and the terminal receives the non-preferred frequency layer. Located above and preferred If the frequency information includes the PL service restriction information, it includes a data receiver for maintaining the current frequency.

In a mobile communication system for a multimedia broadcasting / multicasting service (MBMS service) according to the present invention, a method of controlling a frequency selection of connected mode terminals by a wireless network controller may include: MBMS desired by connected mode terminals located in controlled cells. Determining preference frequency information including preferred frequency layer (PL) service restriction information for restricting movement to preferred frequencies of services, and transmitting a message including the determined preferred frequency information to the connected mode terminals. It includes the process of doing.

An apparatus of a wireless network controller for controlling frequency selection of connected mode terminals in a mobile communication system for a multimedia broadcasting / multicast service (MBMS service) according to the present invention is an MBMS desired for connected mode terminals located in controlled cells. A FLC controller for determining preferred frequency information including preferred frequency layer (PL) service restriction information for restricting movement to preferred frequencies of services, and a message including the determined preferred frequency information to the connected mode terminals. It includes a message transmitting unit for transmitting.

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Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. Like reference numerals are used to designate like elements even though they are shown in different drawings, and detailed descriptions of related well-known functions or configurations are not required to describe the present invention. If it is determined that it can be blurred, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

First, the MBMS service applied to the present invention will be described.

1 shows a simplified configuration diagram of a mobile communication system for an MBMS service. Here, an example of applying a MBMS service to a 3GPP (3rd Generation Project Partnership) system, which is a standard of third generation asynchronous mobile communication, is illustrated.

Referring to FIG. 1, UEs 161, 162, 163, 171, and 172 refer to terminal devices or subscribers capable of receiving MBMS services, and are referred to as cell 1 160 and cell 2 170. Is controlled by a base station apparatus, Node B, which wirelessly transmits MBMS related data to subscribers. A Radio Network Controller (RNC) 140 controls the plurality of cells 160 and 170, selectively transmits multimedia data to a specific cell, and is configured to provide MBMS service. Control the wireless channel. The connection between the RNC 140 and the UEs 161-172 is called a Radio Resource Control (RRC) interface.

The RNC 140 is connected to a Packet Switched or Packet Service (PS) network such as the Internet by a Serving GPRS Support Node (hereinafter referred to as 'SGSN') 130. 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 (BM-SC) 110 and the SGSN 130 and to an external network through a Gateway GPRS Support Node (GGSN). Can be connected. The BM-SC 110 is responsible for scheduling MBMS data as a source of MBMS data.

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

Hereinafter, an example of a cell structure overlapping an area for providing the same MBMS service will be described with reference to FIG. 2.

As shown in FIG. 2, regions covered by a plurality of frequencies, that is, frequency 1 (f1) and frequency 2 (f2), are spatially overlapped in the region A providing a specific MBMS service. Each overlapping frequency or successive cell is referred to herein as a layer.
The FLC does not provide one service at all frequencies (f1, f2) overlapping the same area (A), but moves the terminals joined to the MBMS service to the corresponding frequency in order to provide a service at only one frequency for each possible service. Say a scheme to let.

For example, if the preferred layer PL for a specific MBMS service B is f2 in the cell structure as shown in FIG. 2, the terminals in the layer f1 in the region A are configured when the session of the MBMS service B is started and when In order to receive the MBMS service B during the session, it moves to the layer of f2, that is, performs cell reselection. The UTRAN informs the terminals on the f1 to move to the f2 when the session of the MBMS service B starts and during the session. In this case, f2 is a PL of the MBMS service B, and f1 is a non-preferred layer (NPL) of the MBMS service B.

However, even in NPL, the MBMS service B is not necessarily impossible. The MBMS service B may be provided by RRM (Radio Resource Management) in the NPL for a terminal left in the NPL due to insufficient signal strength measurement results of the PL for providing the MBMS service B. In the above description, the example in which the PL for MBMS service B is fixed to the layer f2 is used. However, the PL for MBMS service B may be a frequency other than f2 depending on the region. For example, in some regions f2 may be a PL of the MBMS service B, while in other regions, f1 may be a PL of the MBMS service B. That is, the PLs of MBMS services are determined according to the cell structure policy of the system operator and the situation of radio resources of the cell currently being used. In the standard of 3GPP, the FLC structure indicating the relationship between MBMS services and corresponding PLs is applied from the start of each MBMS service until the end of the session.

Since the idle mode terminal joining the MBMS service has no connection with the UTRAN and no data transmission, the idle mode terminal can move from the NPL to the PL regardless of whether the PL is available. However, the connected mode terminal is any one of CELL_FACH (Cell-Forward Access Channel), CELL_PCH (Cell-Paging Channel), URA_PCH (UMTS Registration Area-Paging Channel), and CELL_DCH (Cell-Dedicated Channel). The availability of radio resources is determined by their availability.

The CELL_FACH is a state in which a dedicated physical channel is not assigned to a terminal and uses shared transport channels, and the CELL_PCH is a state in which a dedicated physical channel is not assigned to a terminal and a dedicated logical channel is not available. The URA_PCH is almost similar to the CELL_PCH, and is used when the mobility of the terminal is large and there is a burden due to cell update. Finally, the CELL_DCH is a state in which the UE can use dedicated physical channels.

In the mobile communication system providing the MBMS service, the UTRAN may select whether to apply the FLC of the connected mode terminal according to the radio resource state of the corresponding PL. The UTRAN performs an RRM to determine whether to allow or restrict the connected mode terminal to move to the preferred frequency of the corresponding MBMS service, that is, the PL, and to transmit the information according to the determination result to terminals in the controlled cells. Send to. The connected mode terminal operates according to the information.

Hereinafter, an operation of the RNC for determining whether the terminal applies the FLC will be described in detail with reference to FIG. 3.

3 is a diagram illustrating a procedure for determining whether to apply an FLC of a connected mode terminal by an RNC according to the present invention.

Referring to FIG. 3, in step 201, the RNC measures radio resources of a PL for an MBMS service currently in progress in order to determine whether to apply FLC of the UEs in the connected mode located in the NPL.

In step 203, the RNC determines whether the measured radio resource can accommodate related traffic of connected mode terminals. In this case, the radio resource for the PL is sufficient, and the total number of connected mode terminals joined to the MBMS service while being located in the NPL or each state (CELL_FACH, CELL_PCH, URA_PCH, CELL_DCH) among the connected modes. The number of terminals and the like can be considered. If the measured radio resource can accommodate the relevant traffic of the connected mode terminals, it is determined to apply the FLC to the connected mode terminals located in the NPL and proceeds to step 205.

In step 205, the RNC sets FLC_DI (FLC disabled indication for connected mode UE), which is information indicating whether the FLC is applied, to N and transmits the FLC disabled indication for connected mode UE to the connected mode terminal related to the MBMS service. Where N means perform FLC. As such, when FLC_DI is set to N, the UTRAN may provide non-MBMS services at the MBMS preferred frequency.

If the measured radio resource is not acceptable for the associated traffic of the connected mode terminals in step 203, it is determined not to apply the FLC to the connected mode terminals and proceeds to step 207. In step 207, the RNC sets FLC_DI to Y and transmits the FLC_DI to the terminal. Where Y means do not perform FLC. As described above, when FLC_DI is set to Y, dedicated traffic services except for MBMS services having PLs are limited. That is, the UTRAN does not provide any non-MBMS services at MBMS preferred frequencies. Therefore, FLC_DI set to Y is referred to as PL service restriction information.

The FLC_DI may be a flag value of one bit indicating to apply or limit FLC to connected mode terminals or terminals of a specific RRC state (eg, CELL_FACH state). As another embodiment, the FLC_DI may also be given as a 4-bit bitmap format or a 2-bit integer value when it is desired to indicate whether to apply the FLC according to the four states of the connected mode in the network.
For example, if a 4-bit bitmap is used, the first bit represents the URA_PCH state, the second bit represents the CELL_PCH state, the third bit represents the CELL_FACH state, and the fourth bit represents the CELL_DCH state to indicate whether FLC is applied to each state. For example, if the bit map is '0011', it means that a terminal in CELL_FACH and CELL_DCH states does not apply FLC, and a terminal in URA_PCH and CELL_PCH states applies FLC.

As another example, when a 2-bit integer value is used, 00 may represent a CELL_DCH state, 01 may represent a CELL_FACH state, 10 may represent a CELL_PCH state, and 11 may represent a URA_PCH state. In this case, if the integer value has a value of '01', terminals in CELL_FACH state do not apply FLC, and terminals of CELL_DCH, CELL_PCH, and URA_PCH apply FLC.

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4 is a flowchart illustrating the operation of a connected mode terminal according to an exemplary embodiment of the present invention. Here, a case of notifying whether the connected mode terminals apply FLC to FLC_DI, which is a flag value of one bit, will be described.

Referring to FIG. 4, in step 222, the terminal receives a FLC notification message (FLC_notification) including MBMS preferred frequency information through common signaling or dedicated signaling. The MBMS preferred frequency information includes a service ID indicating an MBMS service to perform FLC, preferred frequency information indicating a PL of the MBMS service, MBMS offset, and FLC_DI.

In step 224, the terminal receiving the MBMS preferred frequency information confirms that the service ID indicates the MBMS service joined by the terminal. If the service ID does not indicate the MBMS service joined by the terminal, the flow proceeds to step 234 to maintain the current cell, that is, the current frequency, without performing the FLC.

If the service ID indicates the MBMS service joined by the terminal, the flow proceeds to step 226. In step 226, the terminal identifies the FLC_DI. If the FLC_DI is set to Y, the terminal does not need to apply the FLC and proceeds to step 234. In step 234, the operation is performed at the current frequency without performing an operation such as measuring the PL and reselecting the PL. Even if the current frequency is NPL, if there are enough resources available for the current frequency, the MBMS service that the terminal is to be provided at the current frequency may be provided. Whether the service is provided for the NPL may be known by the terminal receiving MBMS control information transmitted from the NPL.

If the FLC_DI value is set to N in step 226, the terminal proceeds to step 228 and determines whether the currently located frequency is NPL. If the determination result is located in the NPL, in step 230 the terminal performs cell reselection to the PL. If the determination result is not located in the NPL, the flow proceeds to step 234 to maintain the current frequency.

In step 230, the cell reselection is performed based on the result of the signal strength measurement for the PL indicated by FLC_notification received in step 222, and the MBMS offset value increases the cell reselection probability to the PL. Used as an argument for

In FIG. 4, the case in which the FLC is applied or limited to the connected mode terminal or the terminal in a specific RRC state is illustrated as an example of a flag value. However, according to each state of the connected mode, When determining whether to apply FLC, FLC_DI may be given as a 4-bit bitmap or an integer value of 2 bits.

5 is a flowchart illustrating an operation of a connected mode terminal according to another embodiment of the present invention. Here, the terminal checks the FLC_DI only when it is currently located in the NPL, and performs the service selection procedure according to the priority when the FLC_DI is Y.

Referring to FIG. 5, in step 302, the UE receives a FLC notification message including MBMS preferred frequency information. The MBMS preferred frequency information includes a service ID indicating an MBMS service to perform FLC, preferred frequency information indicating a PL, MBMS offset, and FLC_DI. In step 303, the terminal receiving the MBMS preferred frequency information confirms that the service ID indicates the MBMS service joined by the terminal. If the service ID does not indicate the MBMS service joined by the terminal, the flow proceeds to step 311 to maintain the current cell, that is, the current frequency, without applying the FLC.

If the service ID indicates the MBMS service joined by the terminal, the process proceeds to step 312. In step 312, the terminal determines whether the current frequency is NPL. If it is determined that the current frequency is not NPL, the process proceeds to step 311 and the terminal maintains the current frequency without applying the FLC. If the current frequency is NPL as a result of the determination, step 321 is performed.

In step 321, the terminal checks the FLC_DI. If the FLC_DI is set to Y, the terminal proceeds to step 323. In step 323, the terminal selects a service from among a dedicated traffic service currently being received and an MBMS service for applying FLC included in the FLC_notification message. Selection of the service selects a service having a high priority through interaction with a user or a non-access stratum (NAS).

After the service selection, in step 324, it is checked whether the selected service is an MBMS service included in the FLC_notification message, that is, an MBMS service having a PL. If it is confirmed that the MBMS service having the PL, in step 325, to cancel or abandon the dedicated traffic service, and proceeds to step 322 to perform cell reselection to the corresponding PL. In step 322, the terminal performs an operation such as signal strength measurement for the PL for the selected MBMS service and reselection to PL according to the measurement result.

If the selected service is not the MBMS service having the PL but the dedicated traffic service, the terminal proceeds to step 311 and continues to receive the dedicated traffic service while maintaining the current frequency without applying the FLC.

In FIG. 5, the case in which the connected mode terminal indicates whether the FLC is applied as a flag value of one bit has been described as an example. However, the flag value of one bit applied to the terminal in a specific RRC state is used or in the connected mode. According to each state, a 4-bit bitmap or a 2-bit integer value indicating whether FLC is applied may be used.

6 is a view showing an embodiment of a FLC method according to a preferred embodiment of the present invention.

 Here, reference numeral 408 denotes an NPL for a specific MBMS service, and reference numeral 409 denotes a PL. The areas covered by the NPL and the PL overlap the same area, and reference numeral 210 denotes an RNC for managing radio resources of the NPL and PL for the MBMS service.

Referring to FIG. 6, step 411 indicates that the RNC 410 receives a session start message for one session of the MBMS service from the SGSN of the core network. The session start message indicates that the operation of establishing a radio bearer for starting a session of the MBMS service is to be performed. The session start message includes a service ID, quality of service (QoS) information, and the like.

In step 421, the RNC 410 receiving the session start message transmits an FLC Notification message to the NPL 408 as signaling for the FLC. The FLC Notification message includes the service ID, preferred frequency information indicating a PL, MBMS offset, and FLC_DI.

In this case, the service ID indicates the MBMS service corresponding to the session, and the preferred frequency information indicates the PL of the MBMS service. The MBMS offset indicates a threshold value to be compared with the signal strength measurement result of the PL when the terminal of the NPL reselects the PL. In addition, the FLC_DI indicates whether the connected mode terminal applies the FLC.

In step 431, the connected mode terminal of the NPL 408 that has received the FLC Notification message operates according to the FLC_DI of the FLC Notification message. If the FLC_DI is N, the connected mode terminal performs reselection to the PL 409 according to the result of the measurement for the PL 409. If the FLC_DI is Y, the connected mode terminal is receiving at the current frequency. Among the MBMS services to which the traffic service and the FLC indicated in the FLC notification message are applied, service selection according to priority is performed. If the MBMS service to which the FLC is applied is selected in the service selection, the terminal 408 stops the dedicated traffic service and reselects to the corresponding PL according to the result of the management of the PL of the selected MBMS service. To perform. On the other hand, if the dedicated traffic service is selected in the service selection, the terminal 408 continues to receive the dedicated traffic service while maintaining the current frequency and does not perform cell reselection.

In this case, when the idle mode terminal located in the NPL 408 receives the FLC Notification message, regardless of the FLC_DI of the FLC_Notification message, if the signal strength measurement result for the PL 409 is sufficient, the PL 409 may be used. Go to).

Before the session of the MBMS service is started, the RNC 410 performs a counting procedure, a channel type determination, a radio bearer setup, and the like, between steps 431 to 441. .

When the session of the MBMS service is started in step 441, the RNC 410 periodically transmits the FLC Notification message for the session of the MBMS service in steps 451 to 452. This is to support mobility of terminals located in cells controlled by the RNC 410. The terminal of the NPL 408 receives the FLC Notification message which is periodically transmitted. If the FLC is necessary, the terminal of the NPL 408 receives the FLC Notification message in step 461 based on the service ID, the preferred frequency information and the FLC_DI of the FLC Notification message. Cell reselection may be performed to receive the MBMS service.

 In FIG. 6, the case of indicating whether FLC is applied (FLC_DI) for the connected mode terminals by using a flag value of one bit in the FLC application method proposed by the present invention is described. A 4-bit bitmap or a 2-bit integer value indicating the FLC application or restriction may be used using the flag value or depending on the respective state of the connected mode.

As described above, the connected mode terminal can perform the FLC efficiently by knowing the resource availability information of the PL for the desired MBMS service through the FLC_DI.

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 target among the disclosed inventions will be briefly described as follows.

The present invention has an effect of preventing a state in which traffic for a specific service cannot be accepted at a target frequency by being provided with a radio resource state for a service that a connected mode terminal wants to receive.

Claims (26)

A method for selecting a frequency by a connected mode terminal located in a non-preferred frequency layer (NPL) in a mobile communication system for a multimedia broadcasting / multicast service (hereinafter referred to as MBMS service), Receiving, at a non-preferred frequency layer (NPL) of the MBMS service, a message including preferred frequency information related to a preferred frequency of the MBMS service from a Radio Network Controller (RNC); And selectively performing a frequency selection procedure according to whether the preferred frequency information includes preferred frequency layer (PL) service restriction information. The method of claim 1, And if the preferred frequency information does not include the PL service restriction information, moving to the preferred frequency. The method according to claim 1 or 2, And if the preferred frequency information includes the PL service restriction information, maintaining the current frequency. The method of claim 1, And if the terminal is not located in the non-preferred frequency layer, maintaining the current frequency. The method of claim 1, wherein the preferred frequency information, The radio resource of the preferred frequency includes the PL service restriction information when the traffic of the terminals in the connected mode or the specific RRC (Radio Resource Control) state, which is to receive the MBMS service, is not sufficiently acceptable. Frequency selection method. The method of claim 1, wherein the PL service restriction information, A frequency selection method characterized by having a bitmap or an integer value indicating whether a frequency selection procedure is performed according to each state of a connected mode. The method of claim 1, If the preferred frequency information includes the PL service restriction information, performing a service selection procedure according to corresponding priorities; And determining whether to maintain a current frequency according to a result of the service selection procedure. 8. The method of claim 7, further comprising maintaining the current frequency if the service selected according to the service selection procedure is a dedicated traffic service being received at the current frequency. 8. The method of claim 7, wherein if the service selected according to the service selection procedure is an MBMS service having a corresponding preferred frequency, stopping the dedicated traffic service received at the current frequency and moving to the preferred frequency of the selected MBMS service. Frequency selection method comprising a. An apparatus of a terminal for selecting a frequency for an MBMS service in a connected mode in a mobile communication system for a multimedia broadcasting / multicast service (MBMS service), A message receiver for receiving a message including preferred frequency information related to a preferred frequency of the MBMS service from a radio network controller (RNC); A service controller for checking whether the terminal is located in an unpreferred frequency layer of the MBMS service and whether the preferred frequency information includes preferred frequency layer (PL) service restriction information; If the terminal is located in the non-preferred frequency layer and the preferred frequency information does not include the PL service restriction information, the terminal moves to the preferred frequency to receive the MBMS service, and the terminal is located in the non-preferred frequency layer and the preferred frequency information is And a data receiver which maintains a current frequency when the PL service restriction information is included. The method of claim 10, wherein the data receiving unit, And if the terminal is not located in the non-preferred frequency hierarchy, maintain the current frequency. The method of claim 10, wherein the service control unit, And if the terminal is located in the non-preferred frequency layer and the preferred frequency information includes the PL service restriction information, performing a service selection procedure according to corresponding priorities. The method of claim 12, wherein the data receiving unit, If the service selected according to the service selection procedure is a dedicated traffic service being received at the current frequency, the current frequency is maintained; if the selected service is an MBMS service having a corresponding preferred frequency, the dedicated traffic service received at the current frequency is stopped; And moving to a preferred frequency of the selected MBMS service. The method of claim 10, wherein the preferred frequency information, And the radio frequency resource of the preferred frequency includes the PL service restriction information when the traffic of the terminal in the connected mode or the specific RRC state, which is to receive the MBMS service, is not sufficiently acceptable. . The method of claim 10, wherein the PL service restriction information, And a bitmap or an integer value indicating whether a frequency selection procedure is performed according to each state of the connected mode. A method of controlling a frequency selection of connected mode terminals by a wireless network controller in a mobile communication system for a multimedia broadcasting / multicast service (MBMS service), Determining preferred frequency information including preferred frequency layer (PL) service restriction information that restricts connected mode terminals located in controlled cells from moving to preferred frequencies of desired MBMS services; And transmitting a message including the determined preferred frequency information to the connected mode terminals. The method of claim 16, wherein the preferred frequency information, Frequency selection control, characterized in that the radio resource of the preferred frequency includes the PL service restriction information when the traffic of the terminal in the connected mode or a specific RRC state to receive the desired MBMS services is not sufficiently acceptable Way. The method of claim 16, wherein the PL service restriction information, A frequency selection control method characterized by having a bitmap or an integer value indicating whether a frequency selection procedure is performed according to each state of a connected mode. An apparatus of a wireless network controller for controlling frequency selection of connected mode terminals in a mobile communication system for a multimedia broadcasting / multicast service (MBMS service), A FLC control unit for determining preferred frequency information including preferred frequency layer (PL) service restriction information for restricting movement of connected mode terminals located in controlled cells to preferred frequencies of desired MBMS services; And a message transmitter for transmitting a message including the determined preferred frequency information to the connected mode terminals. The method of claim 19, wherein the preferred frequency information, Frequency selection control, characterized in that the radio resource of the preferred frequency includes the PL service restriction information when the traffic of the terminal in the connected mode or a specific RRC state to receive the desired MBMS services is not sufficiently acceptable Device. The method of claim 19, wherein the PL service restriction information, And a bitmap or an integer value indicating whether a frequency selection procedure is performed according to each state of the connected mode. 20. The method of claim 19, wherein the radio resources of the cells controlled by the radio network controller are managed to measure an amount of radio resources available for each frequency of the cells and to be used to determine the preferred frequency information. And a radio resource management unit for providing radio resources to the FLC control unit. delete delete delete delete

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