KR20110037139A - Apparatus and method for receiving and transmitting control message of multimedia broadcasting service in mobile communication system - Google Patents

Abstract

PURPOSE: A method and device for transceiving a control message of a multimedia broadcasting service are provided to supply a multimedia broadcasting service by including whether service information a bit map type changed in a MBMS(Multimedia Broadcast Multicast Service) inform message or not. CONSTITUTION: A transceiving unit(605) receives and transmits a notification message which is transmitted from a base station. A MCCH(MBMC Control Channel) receiving control unit(630) interprets a bitmap included in the informing message according to a mapping relation between a plurality of control channels and a bit map. The MCCH receiving control unit selects at least one control channel among the control channels for multimedia broadcasting service. The MCCH receiving control unit receives control information of the control channel.

Description

Method and apparatus for transmitting and receiving a control message of a multimedia broadcasting service in a mobile communication system {APPARATUS AND METHOD FOR RECEIVING AND TRANSMITTING CONTROL MESSAGE OF MULTIMEDIA BROADCASTING SERVICE IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a method and apparatus for transmitting and receiving a control message for a multimedia broadcasting service in a mobile communication system. More specifically, the present invention relates to a method and apparatus for providing a multimedia broadcasting service by including whether or not to change service information in a bitmap format in an MBMS notification message.

In general, a mobile communication system has been developed for the purpose of providing communication while securing user mobility. Such a mobile communication system has reached a stage capable of providing high-speed data communication service as well as voice communication due to the rapid development of technology.

Recently, one of the next generation mobile communication systems, 3GPP is working on the specification of Long Term Evolution (LTE). LTE is a technology that implements high-speed packet-based communication with a transmission rate of up to 100 Mbps higher than the currently provided data rate with a goal of commercialization in 2010. To this end, various approaches are being discussed, for example, to reduce the number of nodes located on the communication path by simplifying the network structure, or to close wireless protocols as close to the wireless channel as possible.

On the other hand, the data service, unlike the voice service, is determined according to the amount of data to be transmitted and the channel conditions and resources that can be allocated. Therefore, in a wireless communication system such as a mobile communication system, management such as allocating transmission resources is performed in consideration of the amount of resources to be transmitted by the scheduler, the situation of the channel, and the amount of data. This is the same in LTE, one of the next generation mobile communication systems, and a scheduler located in a base station manages and allocates radio transmission resources. Layer 2 protocols such as MAC and RLC are also located at the base station.

In a mobile communication system providing increased wireless capacity and improved quality, such as an LTE mobile communication system, since there are enough conditions to provide a multimedia broadcasting service, attempts to integrate multimedia broadcasting service with mobile communication have continued. In LTE, a multimedia broadcast service is called an MBMS (Multimedia Broadcast Multicast Service), and is defined as a form in which a plurality of base stations transmit data generated from an MBMS server. When ENBs providing MBMS service transmit the same data wirelessly, the transmission efficiency over the wireless is maximized. This technique is called MBSFN (MBMS Single Frequency Network). Since the MBMS service is usually provided for the required period at the required time, the UEs that are interested in the specific MBMS service should be notified of the MBMS service start. For this purpose, notification messages with similar characteristics to paging are used.

The present invention relates to a method and an apparatus for notifying a terminal of change of MBMS service related information using a notificaiton message.

It is an object of the present invention to propose a method and apparatus for providing a multimedia broadcasting service by including whether a service information in a bitmap format is changed in an MBMS notification message.

The method for receiving a control message of a multimedia broadcasting service in a mobile communication system of the present invention for solving the above problems includes receiving system information transmitted from a base station and determining a mapping relationship between a multimedia broadcasting area and a bitmap; Receiving a notification message transmitted from the base station, interpreting a bitmap included in the notification message according to the mapping relationship, and confirming a multimedia broadcasting area in which a multimedia broadcasting service is changed; and a multimedia to be received by the changed multimedia broadcasting area. In the case of a broadcast area, the method may include receiving control information of the corresponding multimedia broadcast area.

In addition, the method for receiving a control message of a multimedia broadcasting service according to another aspect of the present invention, the base station determines the mapping relationship between the plurality of control channels and the bitmap, and setting the corresponding bitmap in the notification message and the Receive the notification message transmitted from the base station, interpret the bitmap included in the notification message according to the mapping relationship, select one or more control channels of the control channel for the multimedia broadcasting service, Receiving control information.

In addition, the apparatus for receiving a control message of the multimedia broadcasting service in the mobile communication system of the present invention for solving the above problems is a multimedia from the transceiver unit for receiving and transmitting the system information and communication message transmitted from the base station and the system information Determine a mapping relationship between a broadcast area and a bitmap, and interpret the bitmap included in the notification message according to the mapping relationship to identify a multimedia broadcast area where a multimedia broadcasting service is changed, and to receive the changed multimedia broadcast area. In the case of a multimedia broadcasting area, the control information receiving control unit controls to receive control information of the corresponding multimedia broadcasting area.

In another aspect of the present invention, an apparatus for receiving a control message of a multimedia broadcasting service in a mobile communication system having a plurality of control channels for a multimedia broadcasting service includes a transceiver unit for receiving and transmitting a notification message transmitted from a base station. The bitmap included in the notification message is interpreted according to the mapping relationship between the plurality of control channels and the bitmap, one or more control channels are selected from the control channels for the multimedia broadcasting service, and the control information of the control channel is obtained. It characterized in that it comprises a control information receiving control unit for controlling to receive.

Application of the present invention can minimize the reception of unnecessary MBMS control messages can extend the battery life of the terminal.

The present invention relates to a method and an apparatus for notifying a terminal whether to change MBMS service related information by using an MBMS notificaiton message (or a notification message, which is the same below).

Prior to explaining the present invention, the LTE mobile communication system will be described in more detail with reference to FIGS. 1 and 2.

1 is a diagram illustrating the structure of an LTE mobile communication system.

Referring to FIG. 1, as illustrated, a radio access network of an LTE mobile communication system includes a next-generation base station (hereinafter referred to as an Evolved Node B, ENB or Node B) 105, 110, 115, and 120 and MME (125 Mobility Management). Entity) and S-GW (130 Serving Gateway). The user equipment (hereinafter referred to as UE) 135 connects to an external network through the ENB and S-GW.

The ENBs 105 to 120 correspond to existing Node Bs of the UMTS system. The ENB is connected to the UE 135 by a radio channel and performs a more complicated role than the existing Node B. In LTE, all user traffic, including real-time services such as Voice over IP (VoIP) over the Internet protocol, is serviced through a shared channel, which requires a device that collects the UE's context information and schedules it. 105-120). One ENB typically controls multiple cells. In order to realize a transmission rate of up to 100 Mbps, LTE uses Orthogonal Frequency Division Multiplexing (OFDM) as a radio access technology in a bandwidth of up to 20 MHz. In addition, an adaptive modulation & coding (AMC) scheme that determines a modulation scheme and a channel coding rate according to the channel state of the terminal is applied. S-GW is a device that provides a data bearer, and generates or removes a data bearer under the control of the MME. The MME is a device that is in charge of various control functions and is connected to a plurality of base stations.

Although not shown in FIG. 1, in the LTE system, there is an MBMS server that generates MBMS data and transmits it to the ENBs. The MBMS server and the ENBs are connected to an IP network.

2 is a diagram illustrating a radio protocol structure in an LTE mobile communication system.

As shown in FIG. 2, the wireless protocol of the LTE system includes PDCP (Packet Data Convergence Protocol 205, 240), RLC (Radio Link Control 210, 235), and MAC (Medium Access Control 215, 230). The PDCP (Packet Data Convergence Protocol) 205, 240 is responsible for operations such as IP header compression / restore, and the radio link control (hereinafter referred to as RLC) 210, 235 is a PDCP PDU (Packet Data Unit). ) Is reconfigured to an appropriate size to perform ARQ operations. An RLC header is added in the RLC layer to perform a predetermined RLC operation such as the ARQ operation. The MACs 215 and 230 are connected to several RLC layer devices configured in one terminal, and multiplex RLC PDUs to MAC PDUs and demultiplex RLC PDUs from MAC PDUs. A MAC header is added at the MAC layer for the multiplexing and demultiplexing. The physical layers 220 and 225 channel-code and modulate upper layer data, make an OFDM symbol, and transmit it to a wireless channel, or demodulate, channel decode, and transmit an OFDM symbol received through a wireless channel to a higher layer. The data input to the protocol entity based on the transmission is called a service data unit (SDU), and the output data is called a protocol data unit (PDU).

3 is a diagram illustrating an example of providing an MBMS service.

Referring to FIG. 3, the MBMS will be briefly described as follows.

MBMS service data is generated in the MBMS server 305, and the data is transmitted to all ENBs 310, 315, 320, 325, and 330 participating in the MBMS transmission. The ENBs store the data received from the MBMS server and transmit the same at the promised time. Since the data transmitted at the same time is the same signal, the signal strength is mutually amplified, and terminals located in the reception area of ENBs receive signals transmitted simultaneously from the multiple ENBs, compared to only receiving signals transmitted by one ENB. It can enjoy much higher reception quality. As described above, a technique in which ENBs transmit the same signal is referred to as MBSFN. An area in which the same data is simultaneously transmitted at the same time is called an MBSFN area (or a multimedia broadcasting area, hereinafter, the same), and one cell may be included in several MBSFN areas at the same time in the form of time division. In other words, any cell belongs to MBSFN region 1 at any time and MBSFN region 2 at another time.

On the other hand, in order to receive the MBMS service, the UE must acquire control information for the MBMS service. In the case of an MBMS service, the control information is transmitted through a common control channel called an MBMS Control Channel (MCCH), and one MCCH exists for each MBSFN region. As described below, the information required for receiving the MCCH may be known as system information of a corresponding cell. In addition, the MCCH transmits information about which MBMS service is transmitted in which format in which MBMS service in the corresponding MBSFN area.

When a new MBMS service is started, information about the new service is newly added to the MCCH. In this case, the network notifies the UEs interested in the newly started MBMS service that it needs to receive the MCCH by transmitting a message called MBMS notification.

The present invention provides a method and apparatus for indicating which MBSFN area MCCH has been changed by including information in a bitmap format in an MBMS notification message. The bitmap information contains bits corresponding to one MBSFN area and bits corresponding to a plurality of MBSFN areas according to a predetermined rule. The UE determines whether the MBMS control channel of the MBSFN region has changed or is likely to be changed based on the value of the bit, and changes the MCCH that may contain control information about the MBMS service that the UE intends to receive or receives. If so, the corresponding MCCH is received.

As described above, one cell may belong to several MBSFN regions, and since there are separate MCCHs for each MBSFN region, several MCCHs may exist in one cell. The present invention eliminates the problem that the UE unnecessarily receives the MCCH even when the MCCH which is not of interest is changed by storing bitmap information indicating 'MBSFN region where the MCCH is changed' in the MBMS notification message. Also, by using the bitmap format, even if several MCCHs are changed at the same time, it is possible to indicate whether or not the plurality of MCCHs are changed at the same time. A specific bit of the bitmap is used as a 'multi bit' to store information about all MBSFN areas that do not correspond one-to-one with bits of a bitmap, thereby providing the number of MBSFN areas to which a cell belongs in the bitmap. Even if the number of bits is exceeded, it is possible to notify whether or not the MCCH is changed.

4 shows the overall operation of the present invention.

The terminal that wants to receive the MBMS service must first acquire control information necessary for receiving the MBMS service through the MCCH. In this case, information necessary for MCCH reception is known as system information of a corresponding cell. The system information includes information on MBSFN regions to which the cell belongs and MCCH configuration information. In this case, the MCCH configuration information may be given as sub information of MBSFN region information as shown in Table 1. In Table 1 below, angle brackets ('>') indicate levels of information, and the lower the number of angle brackets, the higher the level. For example, information with two angles is a lower level of information with one angle.

TABLE 1

Information Element  name Singular plural Contents MBSFN Area Information revenge The number of MBSFN regions to which the cell belongs is stored. > MBSFN area identifier singular Identifier indicating the MBSFN area MCCH Configuration Information singular >> MCCH Identifier singular >> Cycle singular Period in which MCCH is repeated. Unit radio frames >> offset singular Information about when the MCCH is transmitted. Radio frame unit >> Sub frame number singular Subframe number in which the MCCH is transmitted.

On the other hand, the UE needs to know at what time the MCCH for any MBSFN area is transmitted. Hereinafter, a description will be given of a method for the UE to calculate a time point at which an arbitrary MCCH is transmitted. A radio frame is also called a system frame in units of time having a length of 10 msec. The subframe is a unit of time having a length of 1 msec, the ten subframes constitute one system frame. Any time point in an LTE system is identified by a system frame number and a sub frame number. The UE calculates when an arbitrary MCCH is transmitted by substituting the period of the corresponding MCCH and the offset information of the corresponding MCCH into the equation (1).

<Equation 1>

System frame number on which a specific MCCH is broadcast = offset of the corresponding MCCH + period of the corresponding MCCH * n,

Where n is an integer starting from 0. The maximum value of the system frame is 1023.

The UE calculates in which system frame a specific MCCH is transmitted through Equation 1 and recognizes that the corresponding MCCH may be received in a subframe corresponding to a known subframe number in MCCH configuration information among subframes of the system frame. .

The terminal receives and interprets the system information to recognize which MBSFN regions the cell to which it is connected belongs, and the terminal also knows when the MCCH for the MBSFN region is transmitted.

When the UE receives the MBSFN area information, it determines a mapping relationship between the BITMAP and the MBSFN area as described below (417). For reference, throughout the present invention, the MBSFN region and the MCCH always maintain a one-to-one correspondence. In other words, if the MBSFN region is different, the MCCH for it is also different. Therefore, in the embodiments of the present invention described below, MCCH and MBSFN may be used interchangeably for convenience of description.

The BITMAP and the MBSFN region (or MCCH) may be mapped according to a predetermined rule. For example, the MBSFN region (or MCCH) and arbitrary bits of the bitmap can be correlated with each other by using the order in which the MBSFN region information is stored in the system information and the order of the bits located in the BITMAP. As a first example of the mapping method, the MCCH of the MBSFN region information stored first in system information corresponds to the first bit of BITMAP, and the MCCH of the MBSFN region information stored second corresponds to the second bit of BITMAP. You can consider the method. Alternatively, as a second example of the mapping method, an MBSFN region identifier may be used. For example, the MBSFN region with the lowest identifier (or MCCH in that region) maps to the first bit of BITMAP, and the MBSFN region of the second lowest value identifier (with MCCH in that region) corresponds to the second bit in BITMAP. You can consider the method. Alternatively, as a third example of the mapping method, the bits of the MCCH and the BITMAP may be mapped in ascending order of identifiers. Although three embodiments have been described above with respect to a method of mapping a bitmap and an MBSFN region to each other, it should be noted that the present invention is not limited thereto.

On the other hand, since the MBMS Notificaiton message is transmitted through the existing forward control channel, the number of available bits is limited. Depending on which forward control channel format is used, the number of bits available for MBMS notification may vary. For example, if using Downlink Control Information (DCI) format 1C, which is a format for scheduling information for a common control message, 8 bits are available for MBMS notification.

 As such, since the number of bits available for the MBMS notification is limited, in some cases, the number of MCCHs provided in one cell (or the number of MBSFN regions to which one cell belongs) may be larger than the number of available bits. In this case, the present invention does not correspond to the last bit of the bitmap to one MCCH (or not one MBSFN region), but rather all MCCHs other than the MCCH that correspond one-to-one with bits of the bitmap ( Or multiple bits corresponding to all MBSFN areas). That is, the last bit of the bitmap corresponds to all remaining MCCHs that do not correspond to the bits of the bitmap.

For a more detailed description, for example, when the size of the bitmap is 8 bits, the first 7 bits of the bitmap correspond to each of MCCH 0 to MCCH 6 (or MBSFN area 0 to MBSFN area 6), and the last bit It corresponds to all MCCHs (or MBSFN regions) except MCCH 0 to MCCH 6.

According to another embodiment of the present invention, it is also possible to correspond the first bit to multiple MCCHs and the second to last bits to one MCCH by the same principle. In other words, a method of mapping the first bit of the bitmap to all remaining MCCHs other than the MCCH corresponding to the bits below the second bit may be considered.

For convenience of explanation, the MCCH (or MBSFN region) and the one-to-one correspondence bit in the bitmap are single bits, and the remaining MCCHs (or the remaining MBSFN except the MBSFN region) are single bits. The bits corresponding to all of the regions) are named as multiple bits.

In the following description, it is assumed that an arbitrary terminal is interested in an MBMS service corresponding to MBSFN region 11 and that the size of the bitmap is 8 bits. In this case, the terminal determines whether to receive the MCCH in the MBSFN region 11 by checking the multiple bits. For reference, the size of the bitmap is determined by which forward control channel format is used to transmit the MBMS notificaiton. Thus, the size of the bitmap does not change dynamically and has a constant value.

If an event occurs such that a new MBMS service corresponding to the MCCH of the MBSFN region 3 starts at any point in time, the network 415 instructs the base station 410 to update the information on the MCCH of the MBSFN region 3. (410). The base station 410 transmits an MBMS notification to the terminal 405 using a predetermined forward control channel format and a predetermined forward control channel. According to an embodiment of the present invention, the MBMS notification contains a bitmap indicating which MCCH (or MCCH of which MBSFN region) is changed. Assuming that the cell belongs to 12 MBSFN areas from MBSFN area 0 to MBSFN area 11 and that the size of the bitmap is 8 bits and the multiple bits are the last bits, the base station 410 codes the bitmap as 0010 0000 The terminal 405 transmits the data to the terminal 405. Then, the terminal 405 that has received the bitmap of the MBMS notification does not receive the MCCH because the bit corresponding to the MCCH of the MBSFN region 11 of which it is interested, that is, the multiple bits, is set to 0 (420).

If there is a need for updating the MCCH in MBSFN region 1 and the MCCH in MBSFN region 11 at any time thereafter, the network 415 may update the MCCH of MBSFN region 1 with the base station 410 (435). It indicates that the MCCH of the MBSFN area 11 is to be updated (440). The base station 410 transmits the second bit and multiple bits corresponding to the MBSFN area 1 and the MBSFN area 11 to 1 in the MBMS notification. (445). When the terminal 405 receives a bitmap in which multiple bits are set to 1, the terminal 405 recognizes that some of the MCCHs in the MBSFN region between the MBSFN region 7 and the MBSFN region 11, which are not corresponding MBSFN regions in the bitmap, have changed (450). ). The UE 405 refers to the MCCH configuration information to determine the time point at which the MCCH of MBSFN 11 is interested and receives the MCCH at the time point (465). If the multi-bit is set to 1 because the MCCH of the MBSFN region other than the MBSFN region 11 is set to 1, the terminal may unnecessarily receive the MCCH, but compared with the prior art in which all MCCHs were unnecessarily received at all times, power consumption of the terminal Can be greatly reduced.

5 is a flowchart illustrating an operation sequence of a terminal according to an embodiment of the present invention.

First, in step 505 the terminal 405 receives the system information containing the MBSFN area information and MCCH configuration information.

In step 510, the UE 405 determines the correspondence between the MBSFN region (or MCCH in the MBSFN region) and the bits of the BITMAP based on the MCCH configuration information and a predetermined rule. For example, if multiple bits are used as the last bits of the bitmap, and the bits of BITMAP are mapped to the corresponding MCCH in the order in which the MCCH configuration information is stored in the system information, the first bit of the bitmap is the MBSFN region stored in the first part of the system information. MCCH, the second bit of the bitmap is the MCCH of the MBSFN area stored second in the system information, the third bit of the bitmap is the MCCH of the MBSFN area third stored in the system information, and the fourth bit of the bitmap is the system information. The MCCH of the fourth stored MBSFN region, the MCCH of the MBSFN region stored fifth in the system information, the fifth bit of the bitmap, and the MCCH of the MBSFN region stored sixth in the system information, the sixth bit of the bitmap. And the seventh bit of the bitmap corresponds to the MCCH of the MBSFN region seventh stored in the system information, and the last bit of the bitmap corresponds to the MCCHs of the remaining MBSFN regions. The UE checks which single bit in the bitmap the MCCH of the MBSFN area providing the MBMS service of interest, and if it does not correspond to a single bit, determines that it corresponds to multiple bits.

The terminal 405 monitors whether the MBMS notification is transmitted through the forward control channel. When the terminal 405 receives the MBMS notification in step 515, the terminal 405 proceeds to step 520 to interpret the BITMAP stored in the notification. That is, the terminal 405 examines which bit of the BITMAP is set to 1 and determines which MBSFN area corresponds to the MBSFN area corresponding to the bit set to 1. In step 525, the terminal 405 checks whether there is an MBSFN area of interest among the MBSFN areas indicated to receive the MCCH. If there is such an MBSFN area, the terminal 405 proceeds to step 530 to receive the MCCH.

On the other hand, if the terminal 405 is not interested in the MBSFN area where the current bit is set to 1, the terminal 405 waits until another MBMS notification is received. The terminal 405 is interested in itself at step 530 and indicated that the MCCH is changed (if the corresponding MBSFN region corresponds to an individual bit), or that it may be changed (if the corresponding MBSFN region corresponds to multiple bits). Receive MCCH in MBSFN area.

6 is a block diagram showing the structure of a terminal according to an embodiment of the present invention.

As illustrated in FIG. 6, the terminal apparatus according to the embodiment of the present invention includes a transceiver 605, an MCCH reception controller 630, a transceiver controller 635, a multiplexing and demultiplexing apparatus 610, and a control message processing unit ( 625 and various higher layer devices 615 and 620.

The transceiver 605 receives the forward control signal transmitted from the base station through the forward control channel and transmits the forward control signal to the transmit / receive control unit 635.

If the received forward control signal is general forward or reverse scheduling information, the transmission / reception control unit 635 controls the transmission / reception control unit 635 to transmit and receive a signal having a format indicated through the allocated transmission resource. Meanwhile, if the received forward control signal is MBMS notification, the transmission / reception control unit 635 transmits the message to the MCCH reception control unit 630.

The control message processing unit 625 processes the control message transmitted by the network to take necessary actions or transfer the corresponding information to the necessary devices. For example, when the control message processing unit 625 receives system information containing the MCCH configuration information, the control message processing unit 625 transfers the system information to the MCCH receiving control unit 630.

The MCCH reception control unit 630 recognizes a time point at which an arbitrary MCCH is transmitted based on the system information transmitted from the control message processing unit 625, and recognizes a relationship between a bit of the bitmap of the MBMS notification and the MCCH. That is, it recognizes which MCCH corresponds to which bit. The MCCH reception control unit 630 interprets the BITMAP of the MBMS notification transmitted by the transmission and reception control unit 635 to determine which MCCH is likely to be changed or changed, and if the corresponding MBSFN area corresponds to an individual bit, or is to be changed. If there is a possibility (when the corresponding MBSFN region corresponds to multiple bits) and the MCCH is the MCCH of interest, the transceiver 605 is controlled to receive the MCCH. In other words, the MCCH receiving control unit 630 determines the mapping relationship between the multimedia broadcasting area and the bitmap from system information. The MCCH reception control unit 630 analyzes the bitmap included in the notification message according to the mapping relationship to identify the multimedia broadcasting area where the multimedia broadcasting service is changed. As a result, when the changed multimedia broadcasting area is the multimedia broadcasting area to be received, the MCCH receiving control unit 630 controls to receive control information of the corresponding multimedia broadcasting area.

The multiplexing and demultiplexing apparatus 610 multiplexes data generated by the upper layer apparatuses 615 and 620 or the control message processor 625 or demultiplexes the data received by the transceiver 605 so as to provide an appropriate upper layer apparatus or control message. It serves to deliver to the processing unit 625.

The upper layer devices 615 and 620 may be configured for each service. The upper layer devices 615 and 620 may be configured for each service. The upper layer devices 615 and 620 may process data generated from user services such as FTP or VoIP, and deliver the data to the multiplexing device or process the data delivered by the demultiplexing device to the upper layer service application. To pass.

The embodiments of the present invention disclosed in the present specification and drawings are intended to be illustrative only and not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

1 is a diagram illustrating a structure of an LTE mobile communication system.

2 is a diagram illustrating a protocol structure in an LTE mobile communication system.

3 is a diagram illustrating an example of providing an MBMS service.

4 is a diagram showing the overall operation of the present invention.

5 is a flowchart illustrating an operation sequence of a terminal according to an embodiment of the present invention.

6 is a diagram illustrating a terminal device structure of the present invention.

Claims (10)

A method for receiving a control message of a multimedia broadcasting service in a mobile communication system in which control channels for a plurality of multimedia broadcasting services exist, Determining, by the base station, a mapping relationship between the plurality of control channels and the bitmap and setting the corresponding bitmap in the notification message; And Receiving the notification message transmitted from the base station, interpreting a bitmap included in the notification message according to the mapping relationship, selecting one or more control channels of the control channels for the multimedia broadcasting service, and controlling the control channel. And receiving control information of the control message of the multimedia broadcasting service. The method of claim 1, wherein the bitmap information, And controlling the presence or absence of the plurality of control channels for the multimedia broadcast at the same time. The method of claim 1, wherein the determining of the mapping relationship comprises: And determining the mapping relationship by matching control information of the multimedia broadcasting area with bits constituting the bitmap. The method of claim 1, wherein the determining of the mapping relationship comprises: And determining the mapping relationship by associating an identifier of the multimedia broadcasting area with bits constituting the bitmap. The method of claim 1, wherein the determining of the mapping relationship comprises: Determining the mapping relationship by dividing any bit constituting the bitmap into a single bit corresponding to the multimedia broadcasting area one-to-one and multiple bits corresponding to the remaining multimedia broadcasting area except the one-to-one corresponding multimedia broadcasting area. A control message receiving method of a multimedia broadcasting service. An apparatus for receiving a control message of a multimedia broadcasting service in a mobile communication system in which control channels for a plurality of multimedia broadcasting services exist. A transceiver for receiving and transmitting a notification message transmitted from a base station; And The bitmap included in the notification message is interpreted according to the mapping relationship between the plurality of control channels and the bitmap, and one or more control channels are selected from the control channels for the multimedia broadcasting service. And a control information receiving control unit for controlling to receive the control message. The method of claim 6, wherein the bitmap information, And controlling the presence or absence of the plurality of control channels for the multimedia broadcast at the same time. The method of claim 6, wherein the control information receiving control unit, Apparatus for receiving a control message of a multimedia broadcasting service, characterized in that the mapping relationship is determined by matching the control information of the multimedia broadcasting area with the bits constituting the bitmap. The method of claim 6, wherein the control information receiving control unit, And controlling the mapping relationship by associating an identifier of the multimedia broadcasting area with bits constituting the bitmap. The method of claim 6, wherein the control information receiving control unit, Determining the mapping relationship by dividing any bit constituting the bitmap into a single bit corresponding to the multimedia broadcasting area one-to-one and multiple bits corresponding to the rest of the multimedia broadcasting area except for the one-to-one corresponding multimedia broadcasting area. Apparatus for receiving a control message of a multimedia broadcasting service.

Images