KR20100118515A - Control system for supporting mbms service - Google Patents

Abstract

PURPOSE: A control system for MBMS(Multimedia Broadcast Multicast Service) service support is provided to select efficient service area or base station according to the configuration scenario of a service net for broadcasting of multimedia service and multi transmission in a cellular system, thereby providing a MBMA service to a terminal. CONSTITUTION: A transmitting unit(310) transmits a MBMS service request message to a first base station. Based on the MBMS service request message, a receiving unit(330) receives MBMS data from the first base station. In other words, the receiving unit receives MBMS data from a second base station(350) neighbor to the first base station. A handover execution unit(320) performs handover from the first base station to the second base station.

Description

CONTROL SYSTEM FOR SUPPORTING MBMS SERVICE}

The present invention relates to a network configuration and operation including a base station and a technique for controlling the operation of a terminal to efficiently select a service area or a base station to support multiple and broadcast multimedia services in a cellular system. The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research and Development. [Task management number: 2006-S-003-04, Task name: Development of next generation mobile communication service platform] ]

The present invention relates to a network and a base station including a base station to support broadcasting and multiplexing of multimedia services (for example, MBMS (Multimedia Broadcast Multicast Service)) in addition to voice service and data service in a cellular system for providing a packet service. And a method and procedure for controlling a selection procedure such as a service area and a base station in the operation of a terminal. There is no separate control method for this in a conventional system.

In existing cellular systems based on 3GPP, Code Division Multiple Access (CDMA) is applied, and MBMS is used by using a common physical channel (S-CCPCH) that reserves and allocates some codes for MBMS. Provided. The 3GPP wideband CDMA (WCDMA) system, which is asynchronous between base stations, supports MBSFN (MBMS Single Frequency Network) function to enable soft combining between multiple paths at the terminal through synchronous control of downlink physical channels. The selective combine function improves the quality of the radio link channel. In addition, in the existing WCDMA system, the state of the base station and the terminal for information exchange such as traffic is variously applied, and an operation procedure for information exchange is applied differently according to the state of the terminal. The state of the terminal is largely divided into an idle mode and an active mode, and the active mode is subdivided into URA_PCH, CELL_PCH, CELL_FACH, and CELL_DCH states to control the operation of the terminal. In addition, the configuration of a wireless network for providing a service is performed by network nodes such as UE (User Equipment), Node B (Node B), Control Station (RNC: Radio Network Controller), GSN (GPRS Support Node). Configured. In the existing cellular system, not only can a broadcast and multi-transmission of a multimedia service be transmitted using a common channel between a base station and a terminal, but also a common channel is generated when a terminal requesting a broadcast and multi-transmission service requests a base station. In addition, like a unicast service, a point-to-point channel is set up to provide a multimedia broadcasting and multicast service.

However, the LTE (Long Term Evolution) system, which is currently being standardized, is a packet-based system for the purpose of providing pure packet services, and is based on IP (Internet Protocol) -based voice services, games, file transfer protocol (FTP), and video. It will provide various packet services such as streaming and multicast or broadcast service. To this end, the service network is simply composed of a terminal, a base station (or cell), and an aGW (access gateway), which is an endpoint of the network, and the states of the base station and the terminal are simplified and controlled in two states, RRC_IDLE and RRC_CONNECTED. In addition, the LTE system adopts an Orthogonal Frequency Division Multiple (Access) scheme (OFDM (A)), so that radio resource allocation is switched to two-dimensional allocation of frequency and time, not code allocation. In addition, the multimedia broadcasting and multicasting services are based on providing a point to multi point channel rather than a point to point channel.

Accordingly, in the LTE system, a method for efficiently providing a multicast or broadcast service according to various base station environments and terminal operating states including a hierarchical cell configuration is required.

An object of the present invention is to provide an MBMS service to a terminal by selecting an efficient service area or a base station according to a configuration scenario of a service network for broadcasting and multiplexing multimedia services in a cellular system.

The present invention provides a terminal connected to a first base station, comprising: a transmitter for transmitting an MBMS service request message to the first base station and receiving MBMS data from the first base station based on the MBMS service request message; Provided is a terminal including a receiving unit for receiving MBMS data based on the MBMS service request message from a second base station adjacent to a base station.

According to one aspect of the present invention, a base station comprising: a receiving unit and a transmitting unit for receiving an MBMS service request message from a terminal connected to the base station; And an MBMS service determiner configured to determine whether to control the transmitter to directly transmit the MBMS data to the terminal based on the MBMS service request message, or to control the second base station adjacent to the base station to transmit the MBMS data to the terminal. Provided is a base station comprising.

According to another aspect of the present invention, the first base station or the first base station according to the control information receiving unit for receiving the MBMS service control information for the second base station adjacent to the first base station from the first base station and the MBMS service control information; Provided is a terminal including an MBMS data receiving unit for receiving MBMS data from a base station.

According to another aspect of the present invention, in the base station, comprising a control information transmission unit and a transmission unit for transmitting the MBMS service control information of the second base station adjacent to the base station to the terminal, the transmission unit based on the MBMS service control information The base station transmits MBMS data to the terminal or transmits MBMS data to the terminal based on the MBMS service control information.

According to the present invention, an MBMS service can be provided to a terminal by selecting an efficient service area or a base station according to a configuration scenario of a service network for broadcasting and multiplexing multimedia services in a cellular system.

1 is a diagram illustrating a cellular system according to an embodiment of the present invention.
2 is a diagram illustrating a case where two MBSFN regions overlap.
3 is a diagram illustrating a structure of a terminal according to an embodiment of the present invention.
4 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.
5 is a diagram illustrating a structure of a terminal according to another embodiment of the present invention.
6 is a diagram illustrating a structure of a base station according to another embodiment of the present invention.

1 is a diagram illustrating a cellular system according to an embodiment of the present invention.

The cellular system shown in FIG. 1 includes a plurality of base stations 111, 113, 121, 123. In addition, each of the base stations 111, 113, 121, and 123 may configure the MBSFN regions 110 and 120. In FIG. 1, the first MBSFN region 110 includes base stations 111 and 113, and the second MBSFN region 120 includes base stations 121 and 123.

In a cellular system that supports the Multimedia Broadcast Multicast Service (MBMS) service, the base station is an MBMS dedicated base station or cell that supports only the multicast service, a mixed service base station or a mixed service cell that supports both the MBMS and the unicast service (for example, For example, it may be classified into a mixed cell), a general base station or a cell that does not support MBMS.

In addition, in an OFDM or OFDMA-based cellular system, a MBMBN (MBMB Single Frequency Network) function for MBMS service may be introduced to improve performance of terminals in a boundary area of a base station or a cell.

The synchronization of the downlink physical channel is controlled between base stations belonging to the same MBSFN area and belonging to the same frequency layer. Accordingly, MBMS signals transmitted from multiple base stations constituting the same MBSFN area can be soft combined between multiple paths in the terminal. Accordingly, the terminal can overcome performance degradation at the cell boundary. That is, the MBSFN function is a method for a plurality of base stations to efficiently provide MBMS service by overcoming performance degradation due to a wireless environment such as interference to terminals at a cell boundary. For this MBSFN function, base stations or cells belonging to the same MBSFN area must transmit the same MBMS information with the same modulation and coding level using a transmission frequency band (or carrier) designated at a predetermined scheduling period or transmission timing. Accordingly, in the MBSFN region, the terminals may receive packet information for the MBMS service from a plurality of cells, thereby obtaining diversity gain.

In addition, the MBMS service is capable of single cell transmission (Single Cell Transmission) providing the MBMS service with only one base station or cell. In this case, the MBMS service is received from the base station only within the base station area, and the reception performance in the cell boundary area is degraded. Such performance degradation may overcome performance degradation through repetitive transmission or separate modulation and coding schemes.

The MBSFN region may include at least one mixed service base station or cells that simultaneously support unicast service and MBMS. Or it may include only one mixed base station or only MBMS base station.

Base stations included in a particular MBSFN region may transmit data using the same frequency band. The base stations 111 and 113 belonging to the first MBSFN region 1 110 transmit MBMS information by using the first frequency band, and the base stations 121 and 123 belonging to the second MBSFN region 2 120 are made of the first base station. In the case of sharing a second frequency band different from the first frequency band used in one MBSFN region 110 or using the same first frequency band, MBMS information is transmitted with a different transmission time.

In a mobile communication system, a state of a terminal may be classified into a connected state that maintains a connection for exchanging data with a base station, and an idle state that does not have a connection with the base station. Handover is a procedure in which a terminal moves between base stations or cells in an active state and maintains a connection, and cell camping is a procedure for checking a system information of a certain base station during the idle state and preparing a wireless network connection if necessary. It is called). In addition, performing the camping procedure to the new cell as the terminal moves during the idle cell camping is called cell selection or reselection.

MBMS service should basically be able to receive regardless of the state of the terminal. That is, the MBMS service should be able to receive regardless of whether the terminal has established a connection with the base station. Accordingly, in a mobile communication system, a procedure for receiving an MBMS service may vary depending on whether the terminal is in an idle state or a connected state.

1. Control procedure for base station providing only unicast service

In FIG. 1, it is assumed that the first base station 113 is included in the first MBSFN region 110 and the second base station 123 is included in the second MBSFN region 120. In addition, it is assumed that the first base station 113 provides only unicast service. If the terminal 112 is connected to the first base station 113, the terminal 112 may not use the MBMS service using the first base station 113.

If the terminal 112 is in the connected state, the terminal 112 may transmit an MBMS service request message to the first base station 113.

According to an embodiment, the first base station 113 may be switched to the base station providing the MSMS service based on the MBMS service request message.

According to another embodiment, the MBMS service area 120 may be extended to provide the MBMS service to the terminal 112. To this end, the coverage of the second base station 123 adjacent to the first base station 113 may be increased. Alternatively, the second base station 123 may be included as the first MBSFN region 110. In this case, the terminal 112 may perform handover to the second base station 123 capable of MBMS service.

If the terminal 112 is in the idle state, the terminal 113 camped on the first base station 113 cannot use the MBMS service. If the terminal 112 can request the MBMS service using a random access procedure or a separate procedure for joining the MBMS, the MBMS service may be used similarly to the connected state.

If the terminal 112 cannot use a random access procedure or a separate procedure for subscribing to the MBMS, the first base station 113 may transmit MBMS service control information to enable the terminal 112 to use the MBMS service. .

According to an embodiment, the MBMS service control information may be information on an MBMS service provided by the adjacent second base station 123. Alternatively, the MBMS service control information may be information on the MBSFN of the adjacent second base station 123.

The information on the MBMS provided by the second base station 123 may include whether the MBMS dedicated cell exists, whether the MBMS service is provided, MBSFN operation related information, MCCH information change related information, MCCH control channel configuration, and scheduling information. In addition, the MBMS service being provided may include information on whether it is in a broadcast form or a multicast form. If the MBMS service is provided in a multicast form, it may further include subscription and release information.

MBSFN information indicates whether the MBSFN region by the MBMS dedicated cell exists in the vicinity of the first base station 113 camped by the terminal 112, whether the MBSFN region by the mixed cells exists and configuration information of the MBSFN. It may include.

According to another embodiment, the MBMS service control information may be MBMS data transmission priority for the first base station 112 and the second base station 123. When the terminal 112 registers with the network, accesses the wireless network, transitions from the connected state to the idle state, and sets the operating parameters of the idle state, the base station 113 at least at one point in time. ) May give priority to MBMS data transmission to be applied in a cell selection or cell reselection procedure for cell camping.

In general, the terminal 112 camps to the base station 113 that covers the point where the terminal is located in the cell selection or cell reselection procedure or to a base station having the best signal received from the base station. However, the base station may assign the MBMS data transmission priority for cell selection or cell reselection to the terminal, and the terminal may camp at the base station in consideration of the MBMS data transmission priority. The terminal may camp to the base station 123 providing the MBMS service instead of the base station 113 providing the unicast service only in consideration of the MBMS data transmission priority.

2. Control procedure for base stations belonging to different MBSFN areas

When the terminal 112 is in the connected state, the terminal 112 may transmit an MBMS service request message to the first base station 113. The MBMS service request message may include information on the MBMS service that the terminal 112 wants to use. If the first base station 113 provides the MBMS service that the terminal 112 wants to use, the first base station 113 may transmit MBMS data corresponding to the MBMS service to the terminal 112.

If the first base station 113 does not provide the MBMS service that the terminal 112 wants to use and the second base station 123 provides the first base station 113, the first base station 113 determines that the terminal 112 is the second base station 123. ) To receive MBMS service. As an example, the first base station 113 may control the terminal 112 to perform a handover from the first base station 113 to the second base station 123.

In addition, the terminal 112 may receive information on the MBMS service provided by the second base station 123 from the first base station 113 and handover to the second base station 123.

When the terminal 112 is in the idle state, the MBMS service may be provided using a control procedure similar to the control procedure for the base station providing only unicast service.

For example, when the terminal 112 camps to a base station providing a desired MBMS service, the terminal 112 in an idle state receives the MBMS service, and the MBMS service provided by each of the base stations 113 and 123. The priority of MBMS data transmission to each base station 113, 123 can be given according to the type and form of the data base. The terminal 112 may use the desired MBMS service by camping at a specific base station according to the MBMS data transmission priority.

3. Control procedure for cases where two or more MBSFN areas overlap

2 is a diagram illustrating a case where two MBSFN regions overlap.

In FIG. 2, the first MBSFN area 210 includes base stations 211 and 230, and the second MBSFN area 220 includes base stations 221 and 230. That is, the base station 230 is included in both the first MBSFN area 210 and the second MBSFN area 220.

When the terminal 231 is in the connected state, the MBMS service may be provided using a control procedure similar to 'control procedures for base stations belonging to different MBSFN regions'.

When the terminal 231 is in the idle state, the two MBSFN regions 210 and 220 may use the frequency bands dealt with each other. Base stations in each MBSFN area 210 and 220 may use the same frequency band.

The terminal preferentially searches for the frequency band of the base station camped previously. Accordingly, the terminal 231 intending to use the MBMS service may receive MBMS service control information for the adjacent base station in the cell camping procedure, and may preferentially select or reselect the base station providing the MBMS service.

Alternatively, the terminal 231 may receive the MBMS data transmission priority for each base station and preferentially camp for the base station providing the desired MBMS service.

When two MBSFN regions 210 and 220 overlap each other as illustrated in FIG. 2, the terminal 231 camped on the connected terminal or the base station 230 included in both of the MBSFN regions 210 and 220 includes: Both MBMS service control information for two MBSFN areas can be received. Accordingly, the terminal 231 may selectively determine the MBMS region. Also, in this case, the base station 230 may give priority to MBMS data transmission so that the terminal 231 selects a specific MBMS region in consideration of the load state of each MBMS region 210 or 220.

According to another embodiment, the terminal 231 provides MBMS service control information to the user by using a method such as display so that the user of the terminal 231 directly selects a base station or an MBSFN area that provides the MBMS service. can do.

An example of the MBMS service control information displayed by the terminal 231 to the user may be as follows.

-Information on whether MBMS service is provided by neighboring base stations

MBSFN information of neighbor base stations

-Identifier information of MBMS serviceable base station or MBSFN area

-Frequency band information and transmission information of the base station or MBSFN area capable of serving the MBMS;

-Load status of MBMS serviceable base station or MBSFN area

-Service identifier or service information of MBMS serviceable base station or MBSFN area

Signal strength of MBMS serviceable base station or MBSFN area

-Degree of interference of MBMS serviceable base station or MBSFN area

-MBMS service provided by the base station or MBSFN area capable of MBMS service

-Physical layer information such as antenna configuration information of a base station or MBSFN area capable of MBMS service

-UE capability information of MBMS serviceable base station or MBSFN area

3 is a diagram illustrating a structure of a terminal according to an embodiment of the present invention.

The terminal 300 includes a transmitter 310, a handover performer 320, and a receiver 330.

It is assumed that the terminal 300 is connected to the first base station 340.

The transmitter 310 transmits an MBMS service request message to the first base station 340. The MBMS service request message may include information on the MBMS service that the terminal 300 wants to use.

If the first base station 340 is a base station capable of providing an MBMS service, and the first base station 340 can provide an MBMS service that the terminal 300 wants to use, the receiving unit 330 is a first base station ( 340 may receive MBMS data based on the MBMS service request message. The MBMS data may include data corresponding to the MBMS service desired by the terminal 300.

According to another embodiment, when the first base station 340 is a unicast base station or a base station that the terminal 300 does not provide the desired MBMS service, the receiver 330 may receive MBMS data from the second base station 350. Can be. The second base station 350 is a base station adjacent to the first base station 340 and is a base station capable of providing the MBMS service desired by the terminal 300.

According to an embodiment, the second base station 350 may transmit the MBMS data to the terminal 300 by changing the coverage. For example, the second base station 350 may change the coverage of the second base station 350 by increasing the transmission power of the reference signal based on the MBMS service request message or by concentrating and transmitting the reference signal in a specific direction. The terminal 300 may be located within the changed coverage of the second base station 350.

In this case, the handover performer 320 may handover from the first base station 340 to the second base station 350.

If the first base station 340 and the second base station 350 are included in different MBSFN areas, the frequency band used by the first base station 340 and the frequency band used by the second base station 350 may be different from each other. have. According to an embodiment, the terminal 300 may receive data using a plurality of frequency bands. In this case, the receiver 330 may receive unicast data from the first base station 340 using the first frequency band, and receive multicast data from the second base station 350 using the second frequency band. have.

4 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.

The base station 400 includes a receiver 410, an MBMS service determiner 420, and a transmitter 430.

The receiver 410 receives an MSMS service request message from the terminal 450 connected to the base station 400. According to an embodiment, the MBMS service request message may include information on the MBMS service that the terminal 450 wants to use.

The MBMS service determination unit 420 determines whether the base station 400 directly transmits MBMS data related to the MBMS service to the terminal 450, and the second base station 440 adjacent to the base station 400 transmits the MBMS data to the terminal 450. Decide whether or not to do so.

According to an embodiment, when the base station 400 is a base station providing only unicast service, the MBMS service determination unit 420 may determine that the second base station 440 transmits MBMS data to the terminal 450. . In addition, although the base station 400 is a multicast base station capable of providing a multicast service, even if the terminal 450 cannot provide a specific MBMS service desired, the MBMS service determination unit 420 may perform a second base station 440. It may be determined that the MBMS data is transmitted to the terminal 450.

According to another exemplary embodiment, when the base station 400 is a multicast base station capable of providing a multicast service, and the terminal 450 may provide a specific MBMS service desired, the MBMS service determination unit 420 may perform a first service. The base station 400 may determine to directly transmit the MBMS data to the terminal 450.

The transmitter 430 transmits MBMS data directly to the terminal 450 according to the decision of the MBMS service determiner 420.

According to an embodiment, the second base station 440 may transmit MBMS data to the terminal 450 by changing the coverage of the second base station 440. For example, the second base station 440 may change the coverage by increasing the transmission power of the reference signal. In this case, the terminal 450 may be located in the changed coverage of the second base station 440.

The terminal 450 may handover from the first base station 400 to the second base station 450.

According to another embodiment, the second base station 440 may change the included MBSFN area and transmit MBMS data to the terminal 450 according to the changed MBSFN area.

If the first base station 400 and the second base station 440 are included in different MBSFN areas, the frequency band used by the first base station 400 and the frequency band used by the second base station 440 may be different from each other. have. According to an embodiment, the terminal 450 may receive data using a plurality of frequency bands. In this case, the terminal 450 may receive unicast data from the receiver 410 using the first frequency band and receive multicast data from the second base station 440 using the second frequency band.

Alternatively, the terminal 450 may receive multicast data from the receiver 410 using the first frequency band, and receive unicast data from the second base station 440 using the second frequency band.

5 is a diagram illustrating a structure of a terminal according to another embodiment of the present invention.

The terminal 500 includes a control information receiver 510, an MBMS data receiver 520, and a cell selection unit 530.

The control information receiver 510 receives MBMS service control information for the second base station 550 from the first base station 540.

According to an embodiment, the MBMS service control information for the second base station 550 may include information about MBMS service provided by the second base station 550 and information about MBMS data provided by the second base station 550. Can be.

According to an embodiment, the information on the MBMS service provided by the second base station 550 may include information on whether the MBMS data provided by the second base station 550 is in a broadcast form or a multicast form. If the MBMS data is in the form of multicast, it may further include information on subscription and release for multicast.

When the terminal 500 wants to receive the MBMS service in the idle state, the cell selector 530 compares the MBMS service provided by the first base station 540 with the MBMS service provided by the second base station 550. A base station that provides a desired service can be selected.

In addition, the cell selection unit 530 may subscribe or release the multicast service to the first base station 540 or the second base station 550 according to the type of MBMS data.

According to another embodiment, the MBMS service control information for the second base station 550 may include information about the MBSFN of the second base station 550. The MBMS data receiver 520 may receive MBMS data from a plurality of base stations including the second base station 550, and soft combine the respective MBMS data using information on the MBSFN.

According to another embodiment, the MBMS service control information may be MBMS data transmission priority for each base station (540, 550). The cell selector 530 may refer to MBMS data transmission priorities for the base stations 540 and 550 in order to use a specific MBMS service, and select a base station that provides a specific MBMS service.

According to an embodiment, the control information receiver 510 may receive MBMS service control information in a system information block (SIB) of the first base station 540.

Alternatively, the control information receiver 510 may receive MBMS service control information using a separate control channel.

6 is a diagram illustrating a structure of a base station according to another embodiment of the present invention.

The base station 600 includes a control information transmitter 610 and a transmitter 620.

The control information transmitter 610 transmits MBMS service control information of the second base station 640 adjacent to the base station 600 to the terminal 630. According to an embodiment, the MBMS service control information of the second base station 640 may be information on an MBMS service provided by the second base station 640. That is, it may include information on which MBMS service is provided by the second base station 640 and whether the MBMS data transmitted by the second base station 640 is in a broadcast form or a multicast form. If the MBMS service provided by the second base station 640 is in the form of multicast, information on the MBMS transmitted by the second base station 640 may be used for subscribing to the multicast service provided by the second base station 640. May include release information. The terminal 630 may receive MBMS service control information and select one of the base stations 600 and 640 with reference to the MBMS service control information.

According to another embodiment, the MBMS service control information may be MBMS data transmission priority for each base station 600 or 640. When the terminal 630 wants to use a specific MBMS service, the terminal 630 selects a specific base station with reference to the MBMS data transmission priority for each base station 600, 640, and camps at the selected base station. Can be. According to an embodiment of the present invention, the priority of MBMS data transmission for each base station 600, 640 takes into account the data transmission amount of each base station 600, 640, the type and format of MBMS service provided by each base station 600, 640. Can be determined.

When the terminal 630 selects the base station 600, the terminal 630 camps to the base station 600, and the transmitter 620 transmits MBMS data to the terminal 630 based on the MBMS service control information. Can be.

When the terminal 630 selects the second base station 640, the terminal 630 camps to the second base station 640, and the second base station 640 based on the MBMS service control information. Can transfer MBMS data

According to another embodiment, the MBMS service control information may be information on MBSFN of the second base station 640. The terminal 630 may receive MBMS data from a plurality of base stations including the second base station 550, and soft combine the respective MBMS data using information on the MBSFN.

According to an embodiment, the control information transmitter 610 may include MBMS service control information in a system information block (SIB) of the base station 600 and transmit the MBMS service control information to the terminal 630.

Alternatively, the control information transmitter 610 may transmit the MBMS service control information to the terminal 630 using a separate control channel.

110, 120: MBSFN area
111: base stations configuring a first MBSFN region
112: first terminal
113 Unicast Base Stations
121: Base stations configuring a second MBSFN region
122: second terminal
123: multicast base station

Claims (18)

In a terminal connected to a first base station,
A transmitter for transmitting an MBMS service request message to the first base station; And
Receiving unit for receiving MBMS data from the first base station based on the MBMS service request message or from the second base station adjacent to the first base station
Terminal comprising a. The method of claim 1,
The second base station changes the coverage of the second base station in response to the MBMS service request message, and the terminal is located in the changed coverage. The method of claim 1,
Handover performing unit for performing a handover from the first base station to the second base station
The terminal further comprising. The method of claim 1,
And the receiving unit receives unicast data from the first base station using a first frequency band and receives the MBMS data from the second base station using a second frequency band. In the base station,
A receiver which receives an MBMS service request message from a terminal connected to the base station;
A transmission unit; And
An MBMS service determination unit for determining whether to control the transmitter to directly transmit the MBMS data to the terminal based on the MBMS service request message or to control the transmission of the MBMS data to the terminal by a second base station adjacent to the base station;
Base station comprising a. The method of claim 5,
And the second base station transmits the MBMS data to the terminal by changing the coverage of the second base station. The method of claim 5,
And the terminal performs a handover from the base station to the second base station. The method of claim 5,
The transmitter transmits the unicast data to the terminal using a first frequency band, and the second base station transmits the MBMS data to the terminal using a second frequency frequency band. A control information receiver configured to receive MBMS service control information for a second base station adjacent to the first base station from a first base station; And
An MBMS data receiver configured to receive MBMS data from the first base station or the second base station according to the MBMS service control information;
Terminal comprising a. 10. The method of claim 9,
The MBMS service control information is information on MBMS service transmitted by the second base station or information on MBSFN of the second base station. The method of claim 10, wherein the information on the MBMS transmitted by the second base station,
And information on whether the MBMS data is in a broadcast form or a multicast form, and subscription and release information when the MBMS data is in a multicast form. 10. The method of claim 9,
The MBMS service control information is a terminal of the MBMS data transmission priority for each base station. 10. The method of claim 9,
And the control information receiver includes the MBMS service control information in a system information block (SIB) of the first base station. In the base station,
A control information transmitter for transmitting MBMS service control information of a second base station adjacent to the base station to a terminal; And
Transmission
Including,
The transmitter transmits MBMS data to the terminal based on the MBMS service control information, or the second base station transmits MBMS data to the terminal based on the MBMS service control information. The method of claim 14,
And the MBMS service control information is information on MBMS service transmitted by the second base station or information on MBSFN of the second base station. The method of claim 15, wherein the information on the MBMS transmitted by the second base station,
A base station including information on whether the MBMS data is in a broadcast form or a multicast form, and subscription and release information when the MBMS data is in a multicast form. 16. The method of claim 15,
The MBMS service control information is a base station MBMS data transmission priority for each base station. The method of claim 14,
And the control information transmitter includes the MBMS service control information in a system information block (SIB) of the first base station.

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