WO2014163382A1 - Method for supporting continuity of mbms considering nct carrier wave and apparatus therefor - Google Patents

Abstract

The present invention relates to a method for supporting the continuity of MBMS considering an NCT carrier wave in a wireless communications system and an apparatus therefor, and the method is characterized by including the steps of: receiving MBMS service construction information for a source NCT cell by a source auxiliary cell; receiving MBMS from the source base station by the source NCT cell based on the MBMS service construction information for the source NCT cell; receiving a handover command including the MBMS service construction information for a target NCT cell from the source base station by the source auxiliary LCT cell; and receiving MBMS from the target base station by the target NCT cell based on the MBMS service construction information for the target NCT cell.

Description

Method and device for supporting MBMS continuity considering NCT carrier

The present invention relates to wireless communication, and more particularly, to a method and apparatus for supporting MBMS continuity in consideration of NCT carriers in a wireless communication system.

Handover or handoff is when the terminal moves away from the current communication service area (source cell) as the terminal moves to an adjacent communication service area (target cell). It is a function that automatically tunes to a new traffic channel of an adjacent communication service area and keeps a call state continuously. That is, a terminal communicating with a specific base station is linked to another neighboring base station (target base station) when the signal strength of the specific base station (hereinafter referred to as a source base station) is weakened. . If a handover is made, the problem of call disconnection occurring when moving to an adjacent cell can be solved.

MBMS (Multimedia Broadcast / Multicast Service) is a service that transmits data packets to multiple users at the same time similarly to the existing CBS (Cell Broadcast Service). However, unlike CBS, which is a low-speed message-based service, MBMS is intended for high-speed multimedia data transmission, and has a difference in that it is based on IP multicast. When a certain level of users exists in the same cell, the necessary resources (or channels) are shared when they are transmitted to each user so that multiple users receive the same multimedia data to improve the efficiency of radio resources and to provide multimedia services from the user's point of view. It is an advantage of MBMS that it is available cheaply. In order to support MBMS, a multimedia broadcast multicast service single frequency network (MBSFN) scheme may be used. MBSFN uses a common scrambling code and spreading code to simultaneously broadcast the same MBMS channel in a plurality of cells forming an MBMS cell group.

Meanwhile, a multiple component carrier system refers to a wireless communication system capable of supporting carrier aggregation (CA). Carrier aggregation is a technique for efficient use of small fragmented bands. Its effect is to combine multiple bands that are physically continuous or non-continuous in the frequency domain and use logically large bands. It is to make it.

Component Carriers (CC) used in the existing multi-component carrier systems are important for the versatility of the physical layer, and there is still control region redundancy and common signal overhead. As a result, the problems of reducing the resources for data signals, such as unnecessary loss in spectral efficiency are emphasized. Accordingly, in order to efficiently operate such a multi-carrier system, it is required to introduce a new carrier type (NCT: New Carrier Type) constituting a multi-carrier system. In the NCT, signaling for control signaling or channel estimation may be removed or reduced within a range in which there is no degradation or minimization of performance as compared to the legacy carrier type (LCT). Through this, the maximum data transmission efficiency can be obtained.

As a concept such as NCT is introduced in a next generation communication system, a method for supporting MBMS or MBSFN using NCT should be considered. In particular, the nature of the MBMS should be able to support the continuity (MB) continuity (MB) even in the process of handover according to the movement of the terminal. However, there is no disclosure about a method that can support the continuity of MBMS in a communication system based on NCT.

An object of the present invention is to provide a method and apparatus for receiving MBMS in consideration of NCT carriers.

Another technical problem of the present invention is to provide a method and apparatus for supporting MBMS continuity considering an NCT carrier.

Another technical problem of the present invention is to propose a signaling method for guaranteeing MBMS continuity even when receiving an MBMS through an NCT carrier.

Another technical problem of the present invention is to support MBMS continuity when a UE performs handover while receiving an MBMS through an NCT carrier.

Another technical problem of the present invention is to support MBMS continuity when a UE performs cell reselection during MBMS reception through an NCT carrier.

According to an aspect of the present invention, there is provided a method for supporting continuity of a multimedia broadcast multicast service (MBMS) by a terminal in a wireless communication system supporting carrier aggregation (CA). The method includes receiving MBMS service configuration information for a source NCT cell on a source auxiliary cell from a source base station, based on the MBMS service configuration information for the source NCT cell, on the source NCT cell from the source base station. Receiving an MBMS, receiving MBMS service configuration information for a target NCT cell from the source base station or target base station, and the target NCT from the target base station based on the MBMS service configuration information for the target NCT cell Receiving the MBMS on a cell.

According to another aspect of the present invention, a method for supporting continuity of MBMS by a source base station in a wireless communication system supporting carrier aggregation (CA) is provided. The method includes transmitting, on a source auxiliary cell, MBMS service configuration information for a source NCT cell to a terminal, transmitting the MBMS to the terminal on the source NCT cell, and requesting a handover including MBMS continuity information to a target base station. Transmitting a message, receiving a handover response message including MBMS service configuration information for a target NCT cell from the target base station, and receiving, on the source auxiliary cell, the MBMS service configuration information for the target NCT cell; And transmitting a handover command to the terminal.

According to another aspect of the present invention, there is provided a method for supporting continuity of MBMS by a target base station in a wireless communication system supporting carrier aggregation (CA). The method includes transmitting MBMS service configuration information for a target NCT cell to a source base station or a terminal on a target auxiliary cell, and transmitting the MBMS to the terminal on the target NCT cell. It is done.

According to another aspect of the present invention, there is provided a method for supporting continuity of MBMS by a target base station in a wireless communication system supporting carrier aggregation of an NCT carrier and an LCT carrier. The method comprises: receiving a handover request message including MBMS continuity information from a source base station, transmitting a handover response message including MBMS service configuration information for a target NCT cell to the source base station, and the target And transmitting the MBMS to the UE on the NCT cell.

According to the present invention, the MBMS can be smoothly received on the NCT cell. Even when the UE moves to perform handover or cell reselection, the UE can seamlessly receive the MBMS on the changed NCT cell (of the target base station), and the UE supports MBMS related information that cannot be transmitted according to the structural characteristics of the NCT carrier. By receiving with the help of the LCT cell, even when the terminal moves, it is possible to smoothly receive the MBMS on the changed NCT cell.

1 is a block diagram illustrating a wireless communication system.

2 shows mapping between a downlink logical channel, a downlink transport channel, and a downlink physical channel.

3 is a diagram illustrating an MBSFN based communication system to which the present invention is applied.

4 shows an example of a configuration for performing an MBMS service.

5 shows a method of transmitting MBMS service configuration information for an NCT carrier to a terminal through an RRC connection reconfiguration message according to an embodiment of the present invention.

6 illustrates a method of transmitting MBMS service configuration information for an NCT carrier to a terminal through system information blocks according to another embodiment of the present invention.

7 illustrates a method of transmitting MBMS service configuration information for an NCT carrier to a terminal through a system information block according to another embodiment of the present invention.

8 is a flowchart illustrating a handover method for service continuity in an MBMS considering an NCT carrier according to an embodiment of the present invention.

9 is a flowchart illustrating a handover method for service continuity in an MBMS considering an NCT carrier according to another embodiment of the present invention.

10 is a flowchart illustrating a handover method for service continuity in an MBMS considering an NCT carrier according to another example of the present invention.

11 is a flowchart illustrating a cell reselection method for service continuity in an MBMS considering an NCT carrier according to another embodiment of the present invention.

12 is a flowchart illustrating a source base station supporting continuity of MBMS service in consideration of an NCT carrier according to the present invention.

13 is a flowchart illustrating a target base station supporting continuity of MBMS service in consideration of an NCT carrier according to the present invention.

14 shows an example of a flowchart of a terminal supporting continuity of an MBMS service in consideration of an NCT carrier according to the present invention.

15 shows another example of a flowchart of a terminal supporting continuity of an MBMS service in consideration of an NCT carrier according to the present invention.

16 is a block diagram of a source base station, a target base station and a terminal supporting continuity of MBMS service in consideration of an NCT carrier according to the present invention.

Hereinafter, some embodiments will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present specification, when it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present specification, the detailed description thereof will be omitted.

In addition, the present specification describes a wireless communication network, the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting data in the system (for example, the base station) that is in charge of the wireless communication network, or the corresponding wireless Work may be done at the terminal coupled to the network.

1 is a block diagram illustrating a wireless communication system. This may be a network structure of an Evolved-Universal Mobile Telecommunications System (E-UMTS). The E-UMTS system may be referred to as Long Term Evolution (LTE) or LTE-A (Advanced) system. Wireless communication systems are widely deployed to provide various communication services such as voice, packet data, and the like.

On the other hand, there is no limitation on the multiple access scheme applied to the wireless communication system. Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA (SC-FDMA), OFDM-FDMA, OFDM-TDMA For example, various multiple access schemes such as OFDM-CDMA may be used.

Here, the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies. .

Referring to FIG. 1, an Evolved-UTRAN (E-UTRAN) includes at least one base station (BS) 20 that provides a control plane and a user plane to a terminal. The UE 10 may be fixed or mobile and may have other mobile stations, advanced MSs (AMS), user terminals (UTs), subscriber stations (SSs), wireless devices (Wireless Devices), and the like. It may be called a term.

The base station 20 generally refers to a fixed station communicating with the terminal 10, and includes an evolved-NodeB (eNodeB), a base transceiver system (BTS), an access point, and a femto base station. Other terms may be referred to as an eNB, a pico-eNB, a home eNB, a relay, and the like. The base station 20 may provide at least one cell to the terminal. The cell may mean a geographic area where the base station 20 provides a communication service or may mean a specific frequency band. The cell may mean a downlink frequency resource and an uplink frequency resource. Alternatively, the cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource. In addition, in general, when carrier aggregation (CA) is not considered, one cell always has a pair of uplink and downlink frequency resources.

An interface for transmitting user traffic or control traffic may be used between the base stations 20. The source base station (Source BS) 21 refers to a base station in which a radio bearer is currently set up with the terminal 10, and the target base station (Target BS, 22) means that the terminal 10 disconnects the radio bearer from the source base station 21 and renews it. It means a base station to be handed over to establish a radio bearer.

The base stations 20 may be connected to each other through an X2 interface, which is used to exchange messages between the base stations 20. The base station 20 is connected to an evolved packet system (EPS), more specifically, a mobility management entity (MME) / serving gateway (S-GW) 30 through an S1 interface. The S1 interface supports a many-to-many-relation between base station 20 and MME / S-GW 30. A Packet Data Network Gateway (PDN-GW) 40 is used to provide packet data services to the MME / S-GW 30. The PDN-GW 40 varies depending on the purpose or service of communication, and the PDN-GW 40 supporting a specific service can be found using APN information.

2 shows mapping between a downlink logical channel, a downlink transport channel, and a downlink physical channel.

Referring to FIG. 2, a paging control channel (PCCH) is mapped to a paging channel (PCH), and a broadcast control channel (BCCH) is mapped to a broadcast channel (BCH) or a downlink shared channel (DL-SCH). Common Control Channel (CCCH), Dedicated Control Channel (DCCH), and Dedicated Traffic Channel (DTCH) are mapped to DL-SCH. Multicast Control Channel (MCCH) and Multicast Traffic Channel (MTCH) are mapped to Multicast Channel (MCH).

Each logical channel type is defined by what kind of information is transmitted. There are two types of logical channels: control channels and traffic channels.

The control channel is used for transmission of control plane information. BCCH is a downlink channel for broadcasting system control information. PCCH is a downlink channel that transmits paging information and is used when the network does not know the location of the terminal. CCCH is a channel for transmitting control information between the terminal and the network, and is used when the terminal does not have a radio resource control (RRC) connection with the network. The MCCH is a point-to-multipoint or point-to-multipoint downlink channel used for transmitting MBMS control information and is used for terminals receiving MBMS. The DCCH is a point-to-point or point-to-point unidirectional channel for transmitting dedicated control information between the terminal and the network, and is used by a terminal having an RRC connection.

The traffic channel is used for transmission of user plane information. DTCH is a point-to-point or point-to-point channel for transmitting user information and exists in both uplink and downlink. MTCH is a point-to-multipoint or point-to-multipoint downlink channel for transmission of traffic data, and is used for a terminal receiving an MBMS.

Transport channels are classified according to how and with what characteristics data is transmitted over the air interface. The BCH has a predefined transmission format that is broadcast and fixed in the entire cell area. DL-SCH supports hybrid automatic repeat request (HARQ). Support for dynamic link adaptation by changing modulation, coding and transmission power, possibility of broadcast, possibility of beamforming, support for dynamic / semi-static resource allocation, and support for discontinuous reception (DRX) to save terminal power And MBMS transmission support. PCH is characterized by DRX support for terminal power saving and broadcast to the entire cell area. The MCH is characterized by broadcast to the entire cell and MBMS Single Frequency Network (MBSFN) support. MBSFN uses a common scrambling code and spreading code to simultaneously broadcast the same MBMS channel in a plurality of cells forming an MBMS cell group.

Meanwhile, the BCH is mapped to a physical broadcast channel (PBCH), the MCH is mapped to a physical multicast channel (PMCH), and the PCH and DL-SCH are mapped to a PDSCH. PBCH carries the BCH transport block, PMCH carries the MCH, and PDSCH carries the DL-SCH and PCH.

MBMS uses two logical channels. MCCH as a control channel and MTCH as a traffic channel. User data such as real voice or video is transmitted on the MTCH, and configuration information for receiving the MTCH is transmitted on the MCCH. The MTCH and MCCH are point-to-multipoint downlink channels for a plurality of terminals, and may be referred to as shared channels. The MBMS does not allocate radio resources as many as the number of terminals receiving a service, but allocates only radio resources for a shared channel, and simultaneously receives a shared channel from a plurality of terminals, thereby improving efficiency of radio resources.

3 is a diagram illustrating an MBSFN based communication system to which the present invention is applied.

Referring to FIG. 3, the MBSFN-based communication system 300 includes a multi-cell coordination entity (hereinafter referred to as MCE 310), an MBMS gateway (MBMS GW 315) and a base station (eNB) 320. do.

The MCE 310 is a main entity controlling the MBMS and performs a role of session management, radio resource allocation, or admission control of the base station 320 in the MBSFN region. . The MBMS gateway 315 is an entity that transmits MBMS service data and performs MBMS packet transmission and broadcast to the base station 320. MBMS gateway 315 uses Packet Data Convergence Protocol (PDCP) and Internet Protocol (IP) multicast to transmit user data to base station 320.

MBMS service may be provided by setting different MBSFN areas even though they are geographically different locations or the same location. For example, MBSFN region # 1 may support a specific MBMS service A by assigning an MBSFN subframe to frequency f1. At this time, in the MBSFN region, the MBSFN subframe may be allocated to the same frequency f1 to support the MBMS service A. For example, MBMSN region # 2 may support MBMS service A, but MBMS service A may be supported using f3 different from frequency resource f1 in MBSFN region # 1.

The MBSFN based communication system 300 uses the MBSFN subframe for providing MBMS service. For example, in FIG. 3, the second and fifth subframes from the left are MBSFN subframes, the second subframe supports MBMS service of MBSFN region # 1, and the fifth subframe supports MBMS service of MBSFN region # 2. Support. A subframe providing a general communication service other than the MBSFN is called a normal subframe separately from the MBSFN subframe.

The MBSFN subframe may be defined as a subframe that can be used to perform an MBMS service on one frequency carrier. The MBSFN subframe has a special type of slot structure for performing MBMS. For example, the MBSFN subframe uses antenna port 4 for transmission of MBSFN RS, which is a reference signal (RS) for channel estimation for PMCH transmission.

4 shows an example of a configuration for performing an MBMS service.

Referring to FIG. 4, the terminal acquires MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN area information list to perform MBMS service.

The UE may know the MBSFN subframe configuration information, that is, the location of the MBSFN subframe, through System Information Block 2 (SIB2) and RRC dedicated signaling. For example, the MBSFN subframe configuration information may be included in an MBSFN-SubframeConfig information element (IE).

In addition, the UE needs to acquire MBMS control information associated with one or more MBSFN regions capable of performing MBMS services through the system information block 13 (SIB13), and includes an MBSFN region information list and an MBMS notification. Configuration information can be obtained. The MBSFN region information list is the MBSFN region ID for each MBSFN region, the information on the MBSFN region in the MBSFN subframe in the MBSFN region, and the MBSFN subframe position where the MCCH transmission, which is the MBMS control information channel, is generated. Information may be included. For example, the MBSFN area information list may be included in the MBSFN-AreaInfoList information element. On the other hand, MBSFN notification configuration information is the configuration information for the subframe location in which the MBMS notification that informs that there is a change in the MBSFN region configuration information transmitted to the terminal through the MCCH. For example, the MBSFN notification configuration information may be included in the MBMS-NotificationConfig information element. The MBSFN notification configuration information includes time information used for change notification of the MCCH applicable to all MBSFN regions. For example, the time information may include a notification repetition coefficient (notificationRepetitionCoeff), a notification offset (notificationOffset) and a notification subframe index (notificationSF-Index). Here, the notification repetition coefficient means a common change notification repetition period for all MCCHs. The notification offset indicates an offset of a radio frame for which MCCH change notification information is scheduled. The notification subframe index is a subframe index used for transmitting an MCCH change notification on a physical downlink control channel (PDCCH).

  The UE may obtain MBSFN region configuration information through the MCCH corresponding to each of the MBSFN regions obtained through SIB13. The MBSFN region configuration information may be included in the MBSFNAreaconfiguration message, and includes information on physical multicast channels (PMCHs) used by the corresponding MBSFN region. For example, the information on each PMCH includes the location of the MBSFN subframe in which the PMCH is located, Modulation and Coding Scheme (MCS) level information used for data transmission in the subframe, and the MBMS transmitted by the PMCH. Service information and the like.

UE receives MCH data through MTCH based on PMCH. Scheduling on time for the corresponding MCH data can be known through MCH Scheduling Information (MSI) coming down through PMCH. The MCH scheduling information includes information on how long the corresponding MCH data transmission lasts.

As described above, in order to receive the MBMS, the UE must first receive the SIB2 and the SIB13 for the corresponding cell, and the UE can receive the MBMS not only in the connected mode but also in the idle mode. Depending on whether the RRC layer of the UE is logically connected to the RRC layer of the E-UTRAN, the UE may be classified into the connection mode (or state) or the idle mode (or state). It may be called connected mode or idle mode when not connected. Since the UE in the connected mode has an RRC connection, the E-UTRAN may grasp the existence of the UE in units of cells, and thus may effectively control the UE. On the other hand, the idle mode terminal is not identified by the E-UTRAN and managed by the core network in units of a tracking area, which is a larger area unit than the cell. That is, the presence of the terminal in the idle mode is identified only in a large area unit, and must move to the RRC connected mode in order to receive a normal mobile communication service such as voice or data.

When the terminal changes the connected primary serving cell for reasons such as location movement in the connected mode, it may be called handover. When the terminal changes the selected cell in the idle mode, it may be called cell reselection.

If the UE changes the cell due to the location movement while receiving the MBMS service, it may not be possible to continuously receive the MBMS service by changing the MBMS service configuration information. In addition, even in this state, if the UE continuously performs the decoding operation for receiving the MBMS service, it may cause unnecessary battery consumption. There is a need for a terminal using the MBMS service to continuously receive the MBMS service without wasting resources during handover or cell reselection.

A source cell refers to a cell in which a terminal is currently receiving a service. A base station providing a source cell is called a source base station. A neighbor cell refers to a cell that is geographically adjacent to a source cell or on a frequency band. An adjacent cell using the same band with respect to the source cell is called an intra-frequency neighbor cell. In addition, adjacent cells using different bands based on the source cell are called inter-frequency neighbor cells. That is, not only a cell using the same band as the source cell but also a cell using another band, all of the cells adjacent to the source cell may be referred to as adjacent cells.

The UE handover from the source cell to the neighboring cell in frequency is called intra-frequency handover. On the other hand, the UE handover from the source cell to the inter-frequency neighbor cell is referred to as inter-frequency handover. An adjacent cell to which the UE moves in handover is called a target cell. The base station providing the target cell is called a target base station.

The source cell and the target cell may be provided by one base station or may be provided by different base stations. Hereinafter, for convenience of description, it is assumed that the source cell and the target cell are provided by different base stations, that is, the source base station and the target base station. Therefore, the source base station and the source cell, the target base station and the target cell can be used interchangeably.

The MBMS service is designed for the legacy carrier type (LCT), but in order to remove or reduce signaling for control signaling or channel estimation within a range that does not reduce or minimize performance as compared to LCT. There is no design for services in the configured new carrier type (NCT). That is, since the current UE cannot know the information on the MBMS serviced in the NCT cell, it is difficult to correctly receive the MBMS service through the NCT cell. In particular, the nature of the MBMS should be able to support the continuity of the MBMS in the process of handover and cell reselection due to the movement of the terminal, but has yet to be disclosed a method that can support the continuity of the MBMS in the NCT-based communication system There is no bar.

Hereinafter, a new carrier type (NCT) to which the technical spirit of the present invention is applied will be described in detail. When the terminal aggregates the carrier, for example, the legacy carrier type (set as the primary serving cell) and the NCT may be aggregated. In the NCT, for example, signals such as PBCH, PDCCH, PHICH, and PCFICH may not be transmitted. In the LTE-A standard, various transmission modes (TM) are defined to control the type of a multi-antenna transmission scheme, and NCT supports transmission modes (TM) 1 to 8. It may not be. That is, TM9 or TM10 may be supported in NCT. In NCT, downlink control information (DCI) formats 1A and 2D may be used for PDSCH transmission on the NCT. The DCI formats 1A and / or 2D may be indicated through PDCCH or EPDCCH (EPDCCH) on the NCT, or may be indicated through cross-carrier scheduling from the LCT.

Specifically, the NCT may include a non-standalone NCT and a macro-assisted standalone NCT.

First, a non-standalone NCT carrier may mean an NCT carrier associated with an LCT carrier. That is, the non-standalone NCT carrier may mean a carrier that can be connected as a secondary serving cell (Scell) in a situation where the UE is connected to the LCT carrier as a primary serving cell (Pcell). In other words, the UE cannot be connected using the non-standalone NCT carrier as the main serving cell.

Non-standalone NCT carriers can be classified into a synchronous (synchronized) NCT carrier and an unsynchronized NCT carrier.

A synchronous NCT carrier refers to an NCT carrier that operates by referring to synchronization of another carrier (eg, LCT carrier). In other words, the synchronous NCT carrier may be synchronized with other carriers in time and frequency so that a separate synchronization procedure is not required at the terminal. The synchronous NCT carrier may not include PSS, SSS, and CRS (or TRS). This allows for overhead reduction of common RSs. In the synchronous NCT carrier, due to the overhead reduction, there may be advantages such as interference mitigation, energy saving, and improved spectral efficiency for neighboring cells. As a result, network providers can utilize frequency bands more flexibly.

An asynchronous NCT carrier refers to an NCT carrier capable of acquiring and operating independent synchronization regardless of other carriers (eg, LCT carriers). In this case, the asynchronous NCT carriers transmit PSS and SSS in the same manner as the legacy carrier type, but the CRS transmission frequency may be low. For example, in an asynchronous NCT carrier, the CRS may be transmitted with a certain period and / or a predetermined bandwidth, in which case the CRS may be called a reduced CRS or a tracking RS. In more detail, for example, the TRS has a 5 ms period on a time axis and may be transmitted based on the CRS antenna port 0. The TRS may be transmitted in the entire system band on the frequency axis, or may be transmitted only in some system bands. Meanwhile, even in this case, the CSI-RS may be transmitted.

Second, the macro-assisted standalone NCT carrier refers to a carrier that can be connected as a main serving cell, unlike the non-standalone NCT carrier. However, even in this case, it may be different from the LCT cell configured with the LCT carrier in system information for cell operation or signaling for radio resource control. The macro auxiliary standalone NCT carrier may be referred to as a standalone NCT carrier.

In order for a wireless communication system based on such an NCT carrier (cell) to normally support MBSFN, an MBSFN subframe is provided on an NCT carrier. The MBMS service on the NCT carrier is transmitted through an MBSFN subframe, and signaling information similar to that of the MBMS service on a backward compatible carrier type (BCCT) carrier is required. However, the structure of the MBSFN subframe on the NCT carrier differs from the structure of the MBSFN subframe on the BCCT carrier due to the characteristics of the NCT carrier. In addition, operations specific to NCT carriers, for example, signaling structures and methods, which are different from those of the existing MBSFN, must also be changed.

For example, configuration information on an MBMS service provided in an NCT cell using an NCT carrier may be transmitted to a terminal through a secondary LCT cell. Here, the secondary LCT cell refers to an LCT cell that assists the NCT cell. For example, when the carrier aggregation (CA) is configured in the terminal, the secondary LCT cell may mean an LCT cell that is a main serving cell. Another example might be a macro LCT cell that assists macro-assisted stand-alone NCT. In this case, the secondary LCT cell may specifically transmit MBMS service configuration information for the NCT carrier (cell) to the terminal through an RRC connection reconfiguration message, or through system information blocks (ex. SIB2 and SIB13). It may be broadcasted to multiple terminals. Through this, the UE can know the MBMS service configuration information serviced by the NCT cell and can receive the MBMS service through the NCT cell.

5 shows a method of transmitting MBMS service configuration information for an NCT carrier to a terminal through an RRC connection reconfiguration message according to an embodiment of the present invention. Hereinafter, the LCT cell or the NCT cell transmitting information or a message to the terminal means that the LCT cell or the base station configuring the NCT cell transmits the information or message to the terminal through the LCT cell or the NCT cell. Can be. In addition, the following LCT cell may be represented by the LCT carrier, NCT cell may be represented by the NCT carrier.

Referring to FIG. 5, the assisting LCT cell transmits an RRC connection reconfiguration message including MBMS service configuration information for the NCT cell to the terminal (S500). In other words, the secondary LCT cell performs cross-carrier configuration for MBMS service for the NCT cell.

In more detail, the RRC connection reconfiguration message may include, for example, at least one of MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list for an NCT carrier. For example, at least one of the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list is broken into an information element for adding a secondary cell (Scell) in an RRC connection reconfiguration message. It may be included as one component of a cell or may be included in another information element. Specifically, for example, as shown in Table 1 below, the RRC connection reconfiguration message may include a ScellToAddMod field, and the ScellToAddMod field may include a radioResourceConfigCommonScell subfield. At least one of the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list may be information included in the radioResourceConfigCommonScell subfield.

Table 1

On the other hand, since the secondary LCT cell performs cross-carrier configuration (MB) service for the MBMS service for the NCT cell, in this case, the classification of the corresponding NCT carrier should be performed. That is, an indicator for identifying the corresponding NCT carrier may be included in the RRC connection reconfiguration message.

For example, based on the notificationIndicator information allocated to the MBSFN region of the NCT carrier, the corresponding NCT carrier can be distinguished.

TABLE 2

Referring to Table 2, the MBSFN-AreaInfolList information element includes an MBSFN AreaInfo field, and the MBSFN AreaInfo field includes notificationIndicator information. The value configured in the notificationIndicator information indicates a bit position in the PDCCH that notifies the MCCH change. The PDCCH may contain 8-bit bitmap information. For example, if the notificationIndicator information is set to 0 for one MBSFN region, information corresponding to the first bit of the 8-bit bitmap indicates an MCCH change notification of the region. Therefore, when NCT carriers are divided and allocated based on the corresponding bits, confusion may be avoided in MCCH change notification between carriers. That is, the NCT carriers can be distinguished by allocating some of the 8 bits to the LCT carriers and allocating the rest to the NCT carriers. Specifically, for example, in the LCT carrier, if the values 0, 1, 2, and 3 are set as values of the notificationIndicator information for four MBSFN regions, the network selects any one of the remaining values of 4 to 7 for the NCT carrier. The MBSFN region corresponding to the NCT carrier may be set by selecting.

As another example, an MBSFN carrier index may be assigned to an NCT carrier. That is, the RRC connection reconfiguration message may include an MBSFN carrier index. The index may mean an index for carriers providing MBMS service in an eNB providing a service to a UE. Considering Carrier Aggregation (CA), the MBSFN carrier index may be any one of values corresponding to 0 to 7. FIG. In this case, the number of carriers capable of performing MBMS for one UE may be up to eight. However, the MBSFN carrier index is not limited to a value corresponding to 0 to 7, and the range of the index may be defined differently in consideration of the service situation in the system.

The terminal may receive the MBMS service on the NCT cell based on the MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list for the NCT carrier (S510). In this case, in order to receive the MBMS service, the UE receives the MCCH including the MBSFN region configuration information for the NCT carrier, the MAC CE including the MCH scheduling information (MSI) for the target NCT carrier, and the MBMS notification for the target NCT carrier. Receiving, including the PDCCH / EPDCCH may be further performed, the information may be transmitted to the terminal directly from the NCT cell and / or indirectly from the source LCT cell in some cases.

6 illustrates a method of transmitting MBMS service configuration information for an NCT carrier to a terminal through system information blocks according to another embodiment of the present invention.

Referring to FIG. 6, the secondary LCT cell transmits MBSFN subframe configuration information among MBMS service configuration information for the NCT cell to the terminal through SIB2 (S600), and the MBSFN notification configuration information and the MBSFN region information list are transmitted through the SIB13 terminal. In step S605.

In this case, since the secondary LCT cell performs cross-carrier configuration for the MBMS service for the NCT cell, it should be distinguished whether the MBSFN subframe configuration information included in the SIB2 is for the NCT carrier and included in the SIB13. It should be distinguished whether the MBSFN notification configuration information and the MBSFN region information list are for NCT carriers. In other words, the classification of the corresponding NCT carrier should be performed through the delimiter.

First, a separator for an NCT carrier of MBSFN subframe configuration information included in SIB2 may be needed.

As an example of the delimiter, an E-UTRA Absolute Radio Frequency Channel Number (EARFCN) value may be signaled. The carrier frequency is designed by the EARFCN value. Based on the EARFCN value, the MBSFN subframe configuration may indicate to which frequency the EARFCN value is applied. Based on this, the UE may distinguish a corresponding NCT carrier.

As another example of the separator, the MBSFN carrier index value may be indicated. In this case, the MBSFN carrier index value may be signaled together with the EARFCN value to indicate what frequency the MBSFN carrier index means. The MBSFN carrier index may mean an index for carriers providing MBMS service in an eNB that provides a service to a UE.

Next, a separator may be needed for the NSF carrier of the MBSFN notification configuration information and MBSFN region information list included in SIB13.

According to one embodiment of the NCT carrier identifier for the MBSFN notification configuration information, the same may be applied to all MBSFN regions signaled by SIB13. In this case, no separate delimiter is applied.

In another embodiment of the NCT carrier identifier for the MBSFN notification configuration information, the separator may be given differently for each carrier. In this case, an EARFCN value may be used as a separator, and an MBSFN carrier index signaled through SIB2 in S600 may be used.

In addition, as an example of the NCT carrier identifier for the MBSFN region information list, the EARFCN value may be used, and in this case, the MBSFN carrier index signaled through SIB2 in S600 may be used.

The terminal may receive the MBMS service on the NCT cell based on the MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list for the NCT carrier (S610). In this case, in order to receive the MBMS service in the terminal as described above, the MCCH including the MBSFN region configuration information for the NCT carrier, the MAC CE including the MCH scheduling information (MSI) for the target NCT carrier, and the target NCT carrier Receiving such as PDCCH / EPDCCH including MBMS notification may be further performed, and the information may be transmitted from the NCT cell directly and / or indirectly from the source LCT cell to the terminal.

7 illustrates a method of transmitting MBMS service configuration information for an NCT carrier to a terminal through a system information block according to another embodiment of the present invention.

Referring to FIG. 7, the secondary LCT cell transmits MBMS service configuration information (ie, MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list) for the NCT cell to the terminal through SIB15 (S700).

In this case, as described above with reference to FIG. 6, MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list included in the SIB15 may be distinguished through a delimiter whether the corresponding NCT carrier is for the corresponding NCT carrier.

The UE may receive the MBMS service on the NCT cell based on the MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list for the NCT carrier (S710). In this case, in order to receive the MBMS service in the terminal as described above, the MCCH including the MBSFN region configuration information for the NCT carrier, the MAC CE including the MCH scheduling information (MSI) for the target NCT carrier, and the target NCT carrier Receiving such as PDCCH / EPDCCH including MBMS notification may be further performed, and the information may be transmitted from the NCT cell directly and / or indirectly from the source LCT cell to the terminal.

Hereinafter, a method for supporting continuity of MBMS in an MBMS considering an NCT carrier according to the present invention even in a process such as handover and cell reselection according to a movement of a terminal will be described.

8 is a flowchart illustrating a handover method for service continuity in an MBMS considering an NCT carrier according to an embodiment of the present invention. Hereinafter, the MBMS service configuration information may include MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list.

Referring to FIG. 8, when it is recognized that the handover is necessary for the terminal, the source base station transmits a handover request message to the target base station (S820). For example, the source base station may determine the need for handover based on the measurement report received from the terminal. The handover request message includes MBMS continuity information. The MBMS continuity information may be information indicating that the terminal receives the MBMS service. Alternatively, the MBMS continuity information may be information indicating that the UE receives the MBMS service through the NCT cell. Alternatively, the MBMS continuity information may be information indicating that the MBMS service is preferred in the corresponding terminal.

For example, if the terminal supports the MBMS, it may send an MBMS interest indication message to the source base station. The MBMS interest indication message may carry information on a frequency carrier related to a service currently being received or related to a service to be received in the future. The MBMS interest indication message may be generated based on service information received through a specific SIB (n) on the main serving cell. For example, the specific SIB (n) may be SIB15, and SIB15 may be configured with a list of service indicators about which MBMS services are performed by the serving cell and the neighbor cell. The UE can know what services the serving cell and the neighbor cell each support based on SIB15.

The MBMS interest indication message may include a frequency list included in the MBMS-FreqList field. The MBMS continuity information may include, for example, at least one of the frequency list.

Here, the source LCT cell may be, for example, an LCT cell that directly provides an MBMS service to a terminal. In this case, the source LCT cell may transmit the MBMS service configuration information (via system information block (s) (for example, SIB2 and SIB13 or SIB15)) to the terminal. As another example, the source LCT cell may be an LCT cell that assists the source NCT cell to provide MBMS service to the terminal in the source NCT cell. In this case, the source LCT cell transmits MBMS service configuration information for the source NCT cell to the terminal (via an RRC connection reconfiguration message or system information blocks) on the source LCT cell to assist in providing the MBMS service to the terminal. Can be. In this case, the source LCT cell may be called a source auxiliary LCT cell.

The target base station transmits a handover response message to the source base station (S830). The handover response message may include MBSFN subframe configuration information for the target NCT carrier, MBSFN notification configuration information for the target NCT carrier, and MBSFN region information list for the target NCT carrier. In this case, if the UE has a frequency of interest and any one of the NCT carriers configured in the target base station can provide the corresponding MBMS service through the frequency, the target base station is the MBSFN subframe for the target NCT carrier of the frequency The configuration information, the MBSFN notification configuration information, and the MBSFN region information list may be included in the handover response message and transmitted to the source base station.

The source base station transmits a handover command to the terminal on the source LCT cell (S840). The handover command includes the MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list for the target NCT carrier. The handover command may be included in an RRC connection reconfiguration message and transmitted to the terminal.

The terminal changes the MBMS-related configuration at the terminal, based on the MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list for the target NCT carrier, and uses a target NCT carrier. Receive the MBMS service on the cell (S850). Through this, the UE can obtain MBMS service configuration information for the target NCT carrier (cell) even when a handover occurs, and can secure the continuity of the MBMS service.

Hereinafter, an example in which a UE supports continuity of an MBMS service on a target NCT cell, which is a changed cell due to a handover or cell reselection while receiving an MBMS service on a source NCT cell, based on the help of a source (secondary) LCT cell, will be described. However, as described above, the present invention can be applied to the case where the UE receives the MBMS service from the target NCT cell, which is a changed cell due to a handover or cell reselection occurring while receiving the MBMS service directly on the source LCT cell.

9 is a flowchart illustrating a handover method for service continuity in an MBMS considering an NCT carrier according to another embodiment of the present invention. 9 illustrates a case in which a UE performs handover while receiving an MBMS through a source NCT cell. FIG. 9 illustrates a handover procedure in a situation where it is assumed that MBMS service configuration information for an NCT carrier is delivered to each UE by an RRC connection reconfiguration message.

Referring to FIG. 9, the source base station transmits an RRC connection reconfiguration message including MBMS service configuration information for the source NCT carrier to the terminal on the source secondary LCT cell (S900). MBMS service configuration information includes MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list. S900 may include the contents of the S500 procedure in FIG. 5.

The terminal receives the MBMS service on the NCT cell based on the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list for the source NCT carrier (S910).

Since the remaining steps S920, S930, S940, and S950 may be performed in the same manner as the procedures of S820, S830, S840, and S850 in FIG. 8, a detailed description thereof will be omitted.

10 to 11 are flowcharts illustrating a handover method for service continuity in MBMS considering an NCT carrier according to another example of the present invention. 10 to 11 basically include a process of broadcasting MBMS service configuration information for an NCT carrier through system information blocks. In addition, the broadcasting information further includes an MBMS service configuration relationship indicator indicating which secondary LCT carrier the MBMS service configuration information is transmitted in addition to the MBMS service configuration information for the NCT carrier. A description of the MBMS service configuration relationship indicator will be described later with reference to FIGS. 10 to 11.

10 is a flowchart illustrating a handover method for service continuity in an MBMS considering an NCT carrier according to another example of the present invention. 10 is basically MBMS service configuration information for the NCT carrier is broadcast through the system information block (s), but when the handover occurs for the UE, MBMS service configuration information for the target NCT cell through the RRC connection reconfiguration message Assume to transmit.

Referring to FIG. 10, the source base station transmits MBMS service configuration information for the source NCT carrier and MBMS service configuration relationship indicator to the user equipment through SIB (s) on the source secondary LCT cell (S1000). ). Here, as described above, the MBMS service configuration information for the source NCT carrier may include MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list. For example, MBSFN service frame configuration information on the source NCT carrier can be transmitted to the terminal through SIB2, MBSFN notification configuration information for the source NCT carrier, MBSFN region information list for the source NCT carrier and the MBMS service configuration The relationship indicator may be transmitted to the terminal through SIB13. As another example, MBSFN service frame configuration information on the source NCT carrier, MBSFN notification configuration information on the source NCT carrier, MBSFN region information list on the source NCT carrier and the MBMS service configuration relationship indicator to be transmitted to the terminal through SIB15 It may be. Here, SIB15 is an example, of course, another SIB or a new SIB may be used to transmit the MBMS service configuration information and the MBMS service configuration person to the terminal.

In this case, since the source secondary LCT cell performs cross-carrier configuration for the MBMS service for the source NCT cell, MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information included in the SIB (s). Whether or not the list is for a source NCT carrier is as described above in the S600 and S605 procedures of FIG. 6 and the S700 procedure of FIG. 7.

On the other hand, the MBMS service configuration relationship indicator indicates that in the case of MBMS service configuration of a specific cell or MBSFN region, assistance should be received through a secondary LCT cell. The MBMS service configuration relationship indicator indicates NCT cell (and / or the corresponding MBSFN region) to be assisted in receiving the MBMS service when the UE performs handover in the future, and auxiliary LCT cell (and / or the corresponding MBSFN region) to assist. It may include at least one of.

For example, the MBMS service configuration relationship indicator may include only information on an NCT cell or a corresponding MBSFN region that is supported. In this case, the information on the NCT cell or the MBSFN region that receives the help may be referred to as assisted carrier information.

As another example, the MBMS service configuration relationship indicator, along with the information of the NCT cell or MBSFN region (ie, assisted carrier information) that is assisted, the information of the secondary LCT cell or MBSFN region that helps the NCT cell or MBSFN region. It may include. In this case, the assistance LCT cell or the information of the corresponding MBSFN region may be referred to as assisting carrier information. In this case, the assisted carrier information and the assisted carrier information may be configured in pairs. The pair may basically consist of one assisted carrier and one assisted carrier, but the present invention is not limited thereto. That is, the present invention may include one assisted carrier and a plurality of assisted carriers, and a plurality of assisted carriers and one assisted carrier.

As another example, the MBMS service configuration relationship indicator may include only information (ie, assisting carrier information) of an assisting LCT cell or a corresponding MBSFN region.

The range of a cell and / or MBSFN region targeted by the MBMS service configuration relationship indicator may vary according to system layout and configuration. For example, the MBMS service configuration representative may target a neighbor cell and / or a neighboring MBSFN region with respect to a terminal. You can do Or it may target a cell and / or MBSFN region belonging to the same MCE or MBMS GW.

In detail, the assisted carrier information may include the following.

For example, the assisted carrier information may include cell ID list information. The cell ID may be a physical cell ID or may be an evolved cell global ID (ECGI). In this case, a cell having a corresponding cell ID (for example, an NCT cell) indicates that the cell should be helped by another cell (for example, a secondary LCT cell) in performing an MBMS service. That is, in this case, the MBMS service configuration information for the cell may be transmitted to the terminal by another cell.

As another example, the assisted carrier information may include an EARFCN list. In this case, the corresponding cell belonging to the frequency indicated by the EARFCN indicates that the cell should be helped by another cell in performing the MBMS service.

As another example, the assisted carrier information may include an MBSFN carrier index list. In this case, the cell using the carrier having the MBSFN carrier index indicates that the cell should be helped by another cell in performing the MBMS service.

In addition, the assisting carrier information may include the following.

For example, the assisting carrier information may include cell ID list information. The cell ID may be a physical cell ID or may be an ECGI. In this case, the cell having the corresponding cell ID indicates a cell (eg, secondary LCT cell) that helps another cell (eg, an NCT cell) to perform MBMS service. That is, in this case, MBMS service configuration information for another cell may be transmitted to the terminal by the cell for which the help is provided.

As another example, the assisting carrier information may include an EARFCN list. In this case, the corresponding cell belonging to the frequency indicated by the EARFCN represents a cell which helps in performing MBMS service of another cell.

As another example, the assisting carrier information may include an MBSFN carrier index list. In this case, a cell using a carrier having the MBSFN carrier index indicates a cell which helps in performing MBMS service of another cell.

The terminal receives the MBMS service on the source NCT cell based on the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list for the source NCT carrier (S1010).

The remaining steps S1020, S1030, S1040 and S1050 may be performed in the same manner as the procedures of S820, S830, S840 and S850 in FIG. 8, and thus a detailed description thereof will be omitted.

Meanwhile, as described above, the terminal may support the MBMS service even in the idle mode, and continuity of the MBMS service should be supported even when cell reselection is performed according to the movement of the terminal.

11 is a flowchart illustrating a cell reselection method for service continuity in an MBMS considering an NCT carrier according to another embodiment of the present invention.

Referring to FIG. 11, the processes of S1100 and S1110 may be performed in the same manner as the procedures of S1000 and S1010 of FIG. 10. Here, the UE may be moving to another cell while being selected as the source secondary LCT cell as the (RRC) idle mode.

The terminal selects the target secondary LCT cell by cell reselection (S1120). The cell reselection may be performed in the following manner based on the MBMS service configuration relationship indicator received by the UE in step S1100.

For example, when the MBMS service configuration relationship indicator does not include assisted broadcast information and includes only assisted carrier information, the UE may include at least one cell (ie, a target NCT cell) indicated by assisted carrier information; In order to obtain MBMS service configuration information for the MBSFN region, cell reselection may be performed on a secondary cell (ie, target secondary LCT cell) through an autonomous search process, and corresponding information may be obtained.

As another example, when the MBMS service configuration participant does not include assisted carrier information and includes only assisted carrier information, the UE may obtain a cell and / or MBSFN referred to by the assisted carrier information to obtain MBMS service configuration information. You can reselect a cell for a region and get that information.

As another example, when the MBMS service configuration participant includes assisted carrier information and assisted carrier information, the terminal may acquire at least one cell and / or MBSFN region indicated by the assisted carrier information in order to obtain MBMS service configuration information. It is possible to reselect a cell and / or a cell for the MBSFN region referred to by the assisted carrier information paired with the corresponding information.

The target base station configures MBMS service configuration information (ie, MBSFN subframe configuration information for the target NCT carrier, MBSFN notification configuration information for the target NCT carrier, and MBSFN region information for the target NCT carrier on the target secondary LCT cell). List) is transmitted to the terminal through the SIB (s) (S1130). In addition, the target base station may further transmit the MBMS service configuration relationship indicator to the terminal through the SIB (s).

For example, MBSFN service frame configuration information on the target NCT carrier can be transmitted to the terminal through SIB2, MBSFN notification configuration information for the target NCT carrier, MBSFN region information list for the target NCT carrier and the MBMS service configuration The relationship indicator may be transmitted to the terminal through SIB13.

As another example, MBSFN service frame configuration information for the target NCT carrier, MBSFN notification configuration information for the target NCT carrier, MBSFN region information list for the target NCT carrier and the MBMS service configuration relationship indicator to be transmitted to the terminal through SIB15 It may be. Here, SIB15 is an example, of course, another SIB or a new SIB may be used to transmit the MBMS service configuration information and the MBMS service configuration person to the terminal.

In this case, since the target secondary LCT cell performs cross-carrier configuration for the MBMS service for the target NCT cell, the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list included in the SIB (s) are targeted. Whether or not for the NCT carrier is to be distinguished as described above.

The terminal receives the MBMS service on the target NCT cell based on the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list for the target NCT carrier (S1140).

Accordingly, even when the UE performs cell reselection while receiving the MBMS service through the NCT cell in the idle mode, the UE may receive the MBMS service on the changed NCT cell and maintain continuity of the MBMS service.

12 is a flowchart illustrating a source base station supporting continuity of MBMS service in consideration of an NCT carrier according to the present invention.

Referring to FIG. 12, the source base station UE performs MBMS service configuration information for the source NCT cell (or for the NCT cell) on the source secondary LCT cell, that is, the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list. Transmit to (S1200).

For example, the source base station may transmit the MBSFN subframe configuration information, the MBSFN notification configuration information and the MBSFN region information list to the terminal through an RRC connection reconfiguration message on a source secondary LCT cell. In this case, it is possible to distinguish whether the information is on the corresponding NCT carrier based on notificationIndicator information allocated to the MBSFN region of the NCT carrier, or whether the information is on the corresponding NCT carrier based on the MBSFN carrier index.

As another example, the source base station may transmit the MBSFN subframe configuration information to the terminal through SIB2 on the source secondary LCT cell, and transmit the MBSFN notification configuration information and the MBSFN region information list to the terminal through SIB13. In this case, the UE may receive the MBMS service configuration information not only in the RRC connection mode but also in the idle mode. In addition, the source base station may further transmit the MBMS service configuration relationship indicator to the terminal through the SIB13 on the source secondary LCT cell. In this case, the MBMS service configuration relationship indicator may include at least one of the above-described assisted carrier information and assisted carrier information.

As another example, the source base station may transmit the MBSFN subframe configuration information, the MBSFN notification configuration information and the MBSFN region information list to the terminal on the source secondary LCT cell through SIB15. In addition, the source base station may further transmit the MBMS service configuration relationship indicator to the terminal through the SIB15 on the source secondary LCT cell. In this case, the MBMS service configuration relationship indicator may include at least one of the above-described assisted carrier information and assisted carrier information. Here, SIB15 is an example, of course, another SIB or a new SIB may be used to transmit the MBMS service configuration information and the MBMS service configuration person to the terminal.

In the case of MBSFN subframe configuration information, whether the information on the corresponding NCT carrier can be distinguished based on the EARFCN value, or whether the information on the corresponding NCT carrier can be distinguished based on the MBSFN carrier index. In the case of MBSFN notification configuration information, it may be applied to all the signaled MBSFN regions in the same manner, or may be applied differently for each carrier based on the EARFCH value to distinguish whether it is information on a corresponding NCT carrier. The MBSFN region information list may be classified as information on the corresponding NCT carrier based on the EARFCN value or the MBSFN carrier index.

The source base station transmits the MBMS service to the terminal on the source NCT cell (S1210). The source base station transmits the MBMS service including user data such as voice or video to the terminal on the source NCT cell.

The source base station transmits a handover request message to the target base station (S1220). The handover request message includes MBMS continuity information. The MBMS continuity information may be information indicating that the terminal receives the MBMS service. Alternatively, the MBMS continuity information may be information indicating that the UE receives the MBMS service through the NCT cell. Alternatively, the MBMS continuity information may be information indicating that the MBMS service is preferred in the corresponding terminal. For example, if the terminal supports MBMS, it may send an MBMS interest indication message to the source base station, the MBMS interest indication message includes a frequency list included in the MBMS-FreqList field. The MBMS continuity information may include at least one of the frequency list.

The source base station receives a handover response message from the target base station (S1230). The handover response message may include MBSFN subframe configuration information for the target NCT cell (or carrier), MBSFN notification configuration information for the target NCT cell, and MBSFN region information list for the target NCT cell.

The source base station transmits a handover command to the terminal on the source LCT cell (S1240). The handover command includes the MBSFN subframe configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN region information list for the target NCT cell. The handover command may be included in an RRC connection reconfiguration message and transmitted to the terminal.

Meanwhile, even when the terminal is in the idle mode, the source base station may support the continuity of the MBMS service in consideration of the NCT carrier. In this case, in step S1200, the source base station may transmit the MBMS service configuration relationship indicator to the terminal. Specifically, for example, the source base station transmits MBSFN subframe configuration information for the source NCT cell to the terminal through the SIB2 on the source secondary LCT cell, MBSFN notification configuration information for the source NCT cell, MBSFN region information for the source NCT cell The list and the MBMS service configuration relationship indicator may be transmitted to the terminal through SIB13. As another example, the source base station may determine the MBSFN subframe configuration information for the source NCT cell, the MBSFN notification configuration information for the source NCT cell, the MBSFN area information list for the source NCT cell, and the MBMS service configuration relationship indicator on the source secondary LCT cell. It can be transmitted to the terminal through. Here, SIB15 is an example, of course, another SIB or a new SIB may be used to transmit the MBMS service configuration information and the MBMS service configuration person to the terminal.

The MBMS service configuration relationship indicator is information indicating to which secondary LCT cell (or carrier) MBMS service configuration information (ie, MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list) is delivered. The MBMS service configuration relationship indicator may include at least one of assisted carrier information and assisted carrier information.

The procedure of S1220 to S1240 may be omitted in the case of the source base station supporting the continuity of the MBMS service in consideration of the NCT carrier when the terminal is in the idle mode.

13 is a flowchart illustrating a target base station supporting continuity of MBMS service in consideration of an NCT carrier according to the present invention.

Referring to FIG. 13, the target base station receives a handover request message from a source base station (S1300). The handover request message includes MBMS continuity information. The target base station may recognize that the MBMS service should be provided to the terminal through the target NCT cell of the target base station based on the MBMS continuity information.

The target base station transmits a handover response message to the source base station (S1310). The handover response message may include MBSFN subframe configuration information for the target NCT cell (or carrier), MBSFN notification configuration information for the target NCT cell, and MBSFN region information list for the target NCT cell. In this case, if the UE has a frequency of interest and any one of the NCT carriers configured in the target base station can provide the corresponding MBMS service through the frequency, the target base station is the MBSFN subframe for the target NCT carrier of the frequency The configuration information, the MBSFN notification configuration information, and the MBSFN region information list may be included in the handover response message and transmitted to the source base station.

The target base station transmits the corresponding MBMS service to the terminal on the target NCT cell (S1320). The target base station transmits the MBMS service including user data such as voice or video to the terminal on the target NCT cell.

Meanwhile, in the case of the target base station supporting the continuity of the MBMS service in consideration of the NCT carrier when the terminal is in the idle mode, steps S1300 to S1310 may be omitted. However, when the terminal intends to receive the MBMS service on the NCT cell of the target base station through cell reselection while receiving the MBMS service from the source base station in the idle mode, the target base station broadcasts the MBMS service configuration information for the target NCT cell before S1320. It can be transmitted to the terminal through a message (SIB (s)). In this case, for example, the target base station transmits MBSFN configuration information for the target NCT cell to the terminal through SIB2, and sends MBSFN notification configuration information for the target NCT cell and the MBSFN region information list for the target NCT cell to the terminal through SIB13. Can transmit In addition, the target base station may further transmit the MBMS service configuration relationship indicator to the terminal through SIB13. As another example, the target base station may transmit the MBSFN configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN region information list for the target NCT cell to the terminal through SIB15. In addition, the target base station may further transmit the MBMS service configuration relationship indicator to the terminal through SIB15. Here, SIB15 is an example, and the target base station may also transmit the MBMS service configuration information and the MBMS service configuration actor to another UE by including it in another SIB or a new SIB.

14 shows an example of a flowchart of a terminal supporting continuity of an MBMS service in consideration of an NCT carrier according to the present invention. 14 illustrates an operation in which a UE supports MBMS service continuity when performing handover.

Referring to FIG. 14, a terminal receives MBMS service configuration information for a source NCT cell (or carrier), that is, MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list on a source auxiliary LCT cell of a source base station. (S1400).

For example, the terminal may receive the MBSFN subframe configuration information, the MBSFN notification configuration information and the MBSFN region information list through an RRC connection reconfiguration message on a source auxiliary LCT cell of a source base station. As another example, the terminal may receive the MBSFN subframe configuration information through SIB2 on the source auxiliary LCT cell of the source base station, and receive the MBSFN notification configuration information and the MBSFN region information list through SIB13. In addition, the terminal may further receive the MBMS service configuration relationship indicator through the SIB13. As another example, the terminal may receive the MBSFN subframe configuration information, the MBSFN notification configuration information and the MBSFN region information list on the source auxiliary LCT cell of the source base station through SIB15. In addition, the terminal may further receive the MBMS service configuration relationship indicator through the SIB15. Here, SIB15 is an example, and the UE may receive the MBMS service configuration information and the MBMS service configuration actor through another SIB or a new SIB.

The terminal receives the MBMS service on the source NCT cell of the source base station (S1410). The terminal may receive an MBMS service on a source NCT cell based on the MBSFN subframe configuration information for the source NCT carrier, the MBSFN notification configuration information, and the MBSFN region information list.

The terminal receives a handover command on the source secondary LCT cell of the source base station (S1420). The handover command includes MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list for the target NCT carrier of the target base station. The handover command may be included in an RRC connection reconfiguration message.

The terminal receives the MBMS service on the target NCT cell of the target base station (S1430). The terminal may receive an MBMS service on a target NCT cell based on the MBSFN subframe configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN region information list for the target NCT cell. In addition, even when a handover occurs due to the movement of the terminal, the continuity of the MBMS service can be maintained.

15 shows another example of a flowchart of a terminal supporting continuity of an MBMS service in consideration of an NCT carrier according to the present invention. 15 illustrates an operation in which the UE supports MBMS service continuity when performing cell reselection. Here, the UE may move to another cell while receiving an MBMS service on the source NCT cell while being selected as the source secondary LCT cell in the (RRC) idle mode.

Referring to FIG. 15, the terminal receives MBMS service configuration information for the source NCT cell (or carrier) and MBMS service configuration relationship indicator from the source base station through the SIB (s) on the source auxiliary LCT cell of the source base station (S1500). ).

For example, the terminal receives MBSFN subframe configuration information for the source NCT cell from the source base station through SIB2, MBSFN notification configuration information for the source NCT cell, MBSFN region information list for the source NCT cell, and MBMS service configuration relationship The indicator may be received from the source base station via SIB13.

As another example, the terminal receives the MBSFN subframe configuration information for the source NCT cell, the MBSFN notification configuration information for the source NCT cell, the MBSFN region information list for the source NCT cell, and the MBMS service configuration relationship indicator from the source base station through SIB15. can do. Here, SIB15 is an example, and the UE is a MBSFN subframe configuration information for a source NCT cell, MBSFN notification configuration information for a source NCT cell, a list of MBSFN region information for a source NCT cell, and another MB or SBS for a new SIB. Of course, it can also receive through.

The MBMS service configuration relationship indicator is information indicating to which secondary LCT cell (or carrier) MBMS service configuration information (ie, MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list) is delivered. The MBMS service configuration relationship indicator may include at least one of the above-described assisted carrier information and assisted carrier information.

The terminal receives the MBMS service on the source NCT cell of the source base station (S1510). The terminal may receive an MBMS service on a source NCT cell based on the MBSFN subframe configuration information for the source NCT cell, the MBSFN notification configuration information for the source NCT cell, and the MBSFN region information list for the source NCT cell. .

The terminal selects the target secondary LCT cell by cell reselection (S1520). The UE may perform the cell reselection based on the MBMS service configuration relationship indicator received in the S1500 procedure.

The UE may configure MBMS service configuration information for the target NCT cell on the target secondary LCT cell (ie, MBSFN subframe configuration information for the target NCT cell, MBSFN notification configuration information for the target NCT cell, and MBSFN region information list for the target NCT cell). Is received from the target base station through the SIB (s) (S1530). In addition, the terminal may further receive the MBMS service configuration relationship indicator on the target secondary LCT cell from the target base station through the SIB (s).

For example, the terminal may receive the MBSFN subframe configuration information for the target NCT cell on the target secondary LCT cell from the target base station through SIB2, MBSFN notification configuration information for the target NCT cell, MBSFN region information for the target NCT cell The list may be received from the target base station via SIB13. In addition, the terminal may further receive the MBMS service configuration relationship indicator on the target secondary LCT cell from the target base station through SIB13.

As another example, the terminal may receive the MBSFN subframe configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN region information list for the target NCT cell from the target base station on the target auxiliary LCT cell through SIB15. have. In addition, the terminal may further receive the MBMS service configuration relationship indicator on the target secondary LCT cell from the target base station through SIB15. Here, SIB15 is an example, and the UE is a MBSFN subframe configuration information for a target NCT cell, MBSFN notification configuration information for a target NCT cell, a list of MBSFN region information for a target NCT cell, and another MB or SBS for a new SIB. Of course, it can also receive through.

In this case, since the target secondary LCT cell performs cross-carrier configuration for the MBMS service for the target NCT cell, the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list included in the SIB (s) are targeted. Whether or not for the NCT carrier is to be distinguished as described above.

The terminal receives the MBMS service on the target NCT cell based on the MBSFN subframe configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN region information list for the target NCT cell (S1540). Accordingly, even when the UE performs cell reselection while receiving the MBMS service through the NCT cell in the idle mode, the UE may receive the MBMS service on the changed NCT cell and maintain continuity of the MBMS service.

16 is a block diagram of a source base station, a target base station, and a terminal supporting continuity of MBMS service in consideration of an NCT carrier according to the present invention.

Referring to FIG. 16, the terminal 1600 according to the present invention may receive an MBMS service from a source base station 1630 or a target base station 1660. The terminal 1600 includes a terminal receiver 1605, a terminal transmitter 1610, and a terminal processor 1620. The terminal processor 1620 performs functions and controls necessary to implement the features of the present invention as described above.

The terminal receiving unit 1605 receives MBMS service configuration information for the source NCT cell, that is, the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list from the source base station 1630 on the source secondary LCT cell of the.

For example, the terminal receiver 1605 may receive the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list through an RRC connection reconfiguration message. As another example, the terminal receiving unit 1605 may receive the MBSFN subframe configuration information through SIB2 and receive the MBSFN notification configuration information and the MBSFN region information list through SIB13. In addition, the terminal may further receive the MBMS service configuration relationship indicator through the SIB13. As another example, the terminal receiver 1605 may receive the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list through SIB15 (or a new SIB). In addition, the UE may further receive the MBMS service configuration relationship indicator through SIB15 (or a new SIB).

The terminal processor 1620 interprets the message or the information received by the terminal receiver 1605. The terminal processor 1620 interprets the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list for the source NCT carrier (cell), and changes or changes the MBMS related configuration at the terminal based on this. Adjust Through this, the terminal receiver 1605 may receive the MBMS service from the source base station 1630 on the source NCT cell.

The terminal receiver 1605 receives a handover command on the source secondary LCT cell of the source base station 1630. The handover command includes MBSFN subframe configuration information, MBSFN notification configuration information, and MBSFN region information list of the target NCT carrier of the target base station 1660. The handover command may be included in the RRC connection reconfiguration message and received by the terminal receiver 1605.

The terminal processor 1620 interprets the MBSFN subframe configuration information, the MBSFN notification configuration information, and the MBSFN region information list for the target NCT carrier (cell), and changes or changes the MBMS related configuration at the terminal based on the list. Reconstruct Based on this, the terminal receiver 1605 may receive an MBMS service from the source base station 1630 on the target NCT cell.

In addition, the terminal processor 1620 may generate an RRC connection reconfiguration complete message corresponding to the RRC connection reconfiguration message received by the terminal receiver 1605.

The terminal transmitter 1610 transmits an RRC connection reconfiguration complete message corresponding to the RRC connection reconfiguration message received by the terminal receiver 1605 to the source base station 1630.

Meanwhile, when the terminal 1600 is in the RRC idle mode, the terminal processor 1620 may perform (or determine) a cell reselection according to the movement of the terminal 1600. In this case, the terminal processor 1620 may perform cell reselection based on the MBMS service configuration relationship indicator received by the terminal receiver 1605. For example, the terminal processor 1620 may reselect the target secondary LCT cell based on the MBMS service configuration relationship indicator according to the movement of the terminal while the source secondary LCT cell is selected in the RRC idle mode. In this case, the terminal receiving unit 1605 may configure MBMS service configuration information (ie, MBSFN subframe configuration information for the target NCT cell, MBSFN notification configuration information for the target NCT cell, and the target NCT cell for the target NCT carrier). MBSFN region information list) can be received through the SIB (s) on the target secondary LCT cell. In addition, the terminal receiver 1605 may further receive the MBMS configuration relationship indicator through the SIB (s).

For example, the terminal receiver 1605 may receive MBSFN subframe configuration information for the target NCT cell through SIB2, MBSFN notification configuration information for the target NCT cell, and MBSFN region information list for the target NCT cell Can be received through the SIB13 on the target secondary LCT cell. In addition, the MBMS service configuration relationship indicator may be further received through the SIB13 on the target secondary LCT cell.

As another example, the terminal receiving unit 1605 may use the MBSBN subframe configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN region information list for the target NCT cell on the target auxiliary LCT cell. (Or a new SIB). In addition, the MBMS service configuration relationship indicator may be further received through the SIB15 (or a new SIB) on the target secondary LCT cell.

The source base station 1630 includes a source transmitter 1635, a source receiver 1640, and a source processor 1650. The source processor 1650 performs the functions and controls necessary to implement the features of the present invention as described above.

The source transmitter 1635 is configured to transmit the MBSFN subframe configuration information for the source NCT cell, the MBSFN notification configuration information for the source NCT cell, and the MBSFN region information list for the source NCT cell on the source auxiliary LCT cell. To send. For example, the source transmitter 1635 may RRC the MBSFN subframe configuration information for the source NCT cell, the MBSFN notification configuration information for the source NCT cell, and the MBSFN region information list for the source NCT cell. It may be included in the connection reconfiguration message and transmitted to the terminal 1600. As another example, the source transmitter 1635 transmits the MBSFN subframe configuration information for the source NCT cell to the terminal 1600, including the SIB2, and the MBSFN notification configuration information for the source NCT cell, and the The MBSFN region information list for the source NCT cell may be included in the SIB13 and transmitted to the terminal 1600. In this case, the source transmitter 1635 may further include the MBMS service configuration relationship indicator in the SIB13 and transmit the MBMS service configuration relationship indicator to the terminal 1600. As another example, the source transmitter 1635 may include the MBSFN subframe configuration information for the source NCT cell, the BMSFN notification configuration information for the source NCT cell, and the MBSFN region information list for the source NCT cell. It may be included in SIB15 (or a new SIB) and transmitted to the terminal 1600. In this case, the source transmitter 1635 may further include an MBMS service configuration relationship indicator in the SIB15 (or a new SIB) and transmit the MBMS service configuration relationship indicator to the terminal 1600.

The source transmitter 1635 transmits the MBMS service to the terminal 1600 on the source NCT cell. The source transmitter 1635 may transmit the MBMS service including user data such as voice or video to the terminal 1600 on the source NCT cell.

The source processor 1650 determines whether a handover is recognized for the terminal 1600. If the need for handover is recognized, the source processor 1650 may generate a handover request message. For example, the source receiver 1640 may receive a measurement report from the terminal 1600, and the source processor 1650 may determine a need for a handover based on the measurement report. The source processor 1650 may generate the handover request message including the MBMS continuity information. The MBMS continuity information may be information indicating that the terminal receives the MBMS service. Alternatively, the MBMS continuity information may be information indicating that the UE receives the MBMS service through the NCT cell. Alternatively, the MBMS continuity information may be information indicating that the MBMS service is preferred in the corresponding terminal. For example, the source receiver 1640 may receive an MBMS interest indication message from the terminal 1600, and the MBMS interest indication message may include a frequency list included in the MBMS-FreqList field. The MBMS continuity information may include at least one of the frequency list.

The source transmitter 1635 transmits the generated handover request message to the target base station 1660.

The source receiver 1640 receives a handover response message from the target base station 1660. The handover response message may include the MBSFN subframe configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN region information list for the target NCT cell.

The source processor 1650 interprets the handover response message, and the MBSFN subframe configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN region for the target NCT cell. Generate the handover command message including a list of information.

The source transmitter 1635 includes the MBSFN subframe configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN region information list for the target NCT cell. The over command message is transmitted to the terminal 1600.

The target base station 1660 includes a target receiving unit 1665, a target transmitting unit 1670, and a target processor 1680. The target processor 1680 performs functions and controls necessary to implement the features of the present invention as described above.

The target receiving unit 1665 receives the handover request message from the source base station 1630. The handover request message includes the MBMS continuity information.

The target processor 1680 may interpret the handover request message and recognize that the MBMS service should be provided to the terminal 1600 through a target NCT cell based on the MBMS continuity information included in the handover request message. have.

The target processor 1680 includes a handover response message including the MBSFN subframe configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN notification configuration information for the target NCT cell. Create

The target transmitter 1670 includes the MBSFN subframe configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN notification configuration information for the target NCT cell. The response message source base station 1630 is sent.

In addition, when the target processor 1680 determines that the terminal 1600 performs reselection to a target secondary LCT cell configured in the target base station 1660 in an RRC idle mode, MBMS service configuration information for the target NCT cell (ie, MBSFN subframe configuration information for the target NCT cell, MBSFN notification configuration information for the target NCT cell, and MBSFN region information list for the target NCT cell) in the SIB (s), thereby providing a target transmitter 1670. Through the target secondary LCT cell may be transmitted to the terminal 1600 through. In this case, the target processor 1680 may further include the MBMS configuration relationship indicator in the SIB (s) and further transmit the target processor 1670 to the terminal 1600 on the target secondary LCT cell through the target transmitter 1670.

For example, the target processor 1680 includes the MBSFN subframe configuration information for the target NCT cell in SIB2 and transmits the target SFN 1670 to the terminal 1600 on the target auxiliary LCT cell through the target transmitter 1670 and the target NCT. The MBSFN notification configuration information for the cell and the MBSFN notification configuration information for the target NCT cell may be included in SIB13 and transmitted to the terminal 1600 on the target auxiliary LCT cell through the target transmitter 1670. In addition, the target processor 1680 may further include the MBMS service configuration relationship indicator in the SIB13 and transmit the target processor 1670 to the terminal 1600 through the target transmitter 1670.

As another example, the target processor 1680 may use the SIB15 (or the MBSFN subframe configuration information for the target NCT cell, the MBSFN notification configuration information for the target NCT cell, and the MBSFN notification configuration information for the target NCT cell. In addition to the new SIB, it may be transmitted to the terminal 1600 on the target auxiliary LCT cell through the target transmitter 1670. In addition, the target processor 1680 may further include the MBMS service configuration relationship indicator in the SIB15 (or a new SIB) and transmit the MBMS service configuration relationship indicator to the terminal 1600 through the target transmitter 1670.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (20)

1. A method of supporting continuity of a multimedia broadcast multicast service (MBMS) by a terminal in a wireless communication system supporting carrier aggregation (CA),

   Receiving MBMS service configuration information for a source NCT cell on a source auxiliary cell from a source base station;

   Receiving the MBMS on the source NCT cell from the source base station based on the MBMS service configuration information for the source NCT cell;

   Receiving MBMS service configuration information for a target NCT cell from the source base station or target base station; And

   Receiving the MBMS on the target NCT cell from the target base station based on the MBMS service configuration information for the target NCT cell.
2. The method of claim 1,

   And the MBMS service configuration information for the source NCT cell is included in an RRC connection reconfiguration message including a handover command and received from the source base station on the source auxiliary cell.
3. The method of claim 1,

   Further receiving an MBMS service configuration relationship indicator on the source secondary cell from the source base station,

   MBMS service configuration information for the source NCT cell may include multimedia broadcast multicast service single frequency network (MBSFN) subframe configuration information for the source NCT cell, MBSFN notification configuration information for the source NCT cell, and the A method for supporting MBMS continuity, comprising: a list of MBSFN area information for a source NCT cell.
4. The method of claim 3, wherein

   MBSFN subframe configuration information for the source NCT cell is received and included in a system information block (SIB) 2, MBSFN notification configuration information for the source NCT cell, and MBSFN region information list for the source NCT cell. , And the MBMS service configuration relationship indicator is included in SIB13 and received.
5. The method of claim 3, wherein

   MBSFN subframe configuration information for the source NCT cell, MBSFN notification configuration information for the source NCT cell, MBSFN region information list for the source NCT cell, and the MBMS service configuration relation indicator are included in SIB15 and received. MBMS continuity support method.
6. The method of claim 3, wherein

   The MBMS service configuration relation indicator may include assisted carrier information, which is information on an NCT carrier, which is necessary for performing the MBMS, and assisted carrier information, which is information on a carrier that supports the NCT carrier, which needs help. MBMS continuity support method, characterized in that it comprises at least one of (assisting carrier information).
7. The method of claim 6,

   The assisted carrier information includes a cell ID list, an EARFCN list, or an MBSFN carrier index indicating an NCT carrier requiring the assistance,

   The assisting carrier information, characterized in that it comprises a cell ID list, EARFCN list or MBSFN carrier index indicating the LCT carrier to assist the NCT carrier needing assistance, MBMS continuity support method.
8. As a method for supporting continuity of MBMS by a source base station in a wireless communication system supporting carrier aggregation (CA),

   Transmitting, on the source auxiliary cell, MBMS service configuration information for the source NCT cell to the terminal;

   Transmitting the MBMS to the UE on the source NCT cell;

   Transmitting a handover request message including MBMS continuity information to the target base station;

   Receiving a handover response message including MBMS service configuration information for a target NCT cell from the target base station; And

   Transmitting, on the source auxiliary cell, a handover command including the MBMS service configuration information for the target NCT cell.
9. The method of claim 8,

   And including the MBMS service configuration information for the source NCT cell in the RRC connection reconfiguration message and transmitting the information on the source auxiliary cell.
10. The method of claim 8,

    On the source secondary cell, further send an MBMS service configuration relationship indicator to the terminal,

    MBMS service configuration information for the source NCT cell includes MBSFN subframe configuration information for the source NCT cell, MBSFN notification configuration information for the source NCT cell, and MBSFN region information list for the source NCT cell. MBMS continuity support method.
11. The method of claim 10,

    MBSFN subframe configuration information for the source NCT cell is transmitted to the UE, including in SIB2, MBSFN notification configuration information for the source NCT cell, MBSFN region information list for the source NCT cell, and the MBMS service configuration relationship indicator MBMS continuity support method, characterized in that included in SIB13 and transmitted to the terminal.
12. The method of claim 10,

    MBSFN subframe configuration information for the source NCT cell, MBSFN notification configuration information for the source NCT cell, MBSFN region information list for the source NCT cell, and the MBMS service configuration relation indicator are included in SIB15 and transmitted to the terminal. Characterized in that the MBMS continuity support method.
13. The method of claim 10,

    The MBMS service configuration relationship indicator includes at least one of assisted carrier information which is information on an NCT carrier that needs help in performing the MBMS, and assisted carrier information which is information about a carrier that assists the NCT carrier that needs help. MBMS continuity support method, characterized in that.
14. The method of claim 13,

    The assisted carrier information includes a cell ID list indicating an NCT carrier requiring assistance, an E-UTRA Absolute Radio Frequency Channel Number (EARFCN) list, or an MBSFN carrier index.

    The assisting carrier information, characterized in that it comprises a cell ID list, EARFCN list or MBSFN carrier index indicating the LCT carrier to assist the NCT carrier needing assistance, MBMS continuity support method.
15. The method of claim 14,

    The MBMS continuity information, characterized in that any one of the frequencies included in the MBMS frequency list, MBMS continuity support method.
16. In a wireless communication system supporting carrier aggregation (CA), a method of supporting continuity of MBMS by a target base station,

    Transmitting MBMS service configuration information for the target NCT cell to the source base station, or transmitting to the terminal on the target secondary cell; And transmitting the MBMS to the terminal on the target NCT cell.
17. The method of claim 16,

    Receiving a handover request message including MBMS continuity information from the source base station,

    The MBMS service configuration information for the target NCT cell is included in a handover response message and transmitted to the source base station, MBMS continuity support method.
18. The method of claim 17,

    And determining the target NCT cell to provide the MBMS based on the MBMS continuity information.
19. The method of claim 18,

    The MBMS continuity information is information indicating that the terminal is receiving the MBMS at the terminal, information indicating that the terminal is receiving the MBMS through an NCT cell or the source NCT cell, and the terminal is the MBMS Is at least one of information that prefers to continue.
20. The method of claim 18,

    The MBMS continuity information, characterized in that any one of the frequencies included in the MBMS frequency list, MBMS continuity support method.

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