KR20100068154A - Continuity providing apparatus and method for multicast service - Google Patents

Abstract

PURPOSE: A device and a method capable of providing continuity of multicast service are provided to minimize cut of the multicast service when inter-cell occurs on a sleep mode terminal receiving the multicast service. CONSTITUTION: A wireless bearer information receiver unit(310) periodically receives the wireless bearer information about the multicast service from the source base station and stores it. If the hand over occurs among the reception of the multicast service packet, a service support decision unit(320) decides the multicast service support of a target base station. In case the target base transceiver station supports the multicast service, a wireless bearer information setting unit(330) sets the wireless bearer information about the recently received multicast service.

Description

Continuity providing apparatus and method for multicast service

The present invention relates to a technology for maintaining multicast service continuity in multimedia broadcast / multicast services (MBMS), and in particular, to prevent the loss of multicast service due to a base station change caused by a handover of a dormant terminal. The present invention relates to an apparatus and a method for providing multicast service continuity.

The present invention is derived from a study conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Telecommunication Research and Development. [Task management number: 2008-S-006-01, Task name: Open IPTV in wired and wireless environment] 2.0) Technology Development].

In the mobile communication network, multimedia broadcast / multicast services (MBMS) are defined for efficient use of wired and wireless resources. The multicast service of the multimedia broadcasting / multicast service (MBMS) can be used only by a person who subscribes to the service, and the service is performed in the cell by the user joining the service.

The multicast service has a feature of setting and transmitting radio bearers (RBs) only when there is at least one receiving terminal in a cell, so that long breaks occur when moving to an unserviced cell.

In the case of a connected mode (RRC-Connected Mode) terminal, a handover message may be used. However, when a mobile terminal moves to an idle mode, the base station does not know the movement of the terminal. The disconnection becomes more serious as the time to set it becomes longer.

Accordingly, the present invention provides a continuity of a multicast service during inter-cell handover of a dormant mode terminal receiving a multicast service, and in particular, a technique capable of minimizing interruption of a multicast service when moving to a cell in which the multicast service is not running. I did research.

The present invention has been made in view of the above, and provides an apparatus and method for providing a multicast service continuity capable of minimizing interruption of a multicast service when a dormant mode terminal receiving a multicast service performs handover between cells. For that purpose.

According to an aspect of the present invention for achieving the above object, when a dormant mode terminal receiving a multicast service is handovered between cells, if the target base station supports the multicast service, the neighbor received recently through the source base station A multicast service packet is seamlessly received using radio bearer information on a multicast service provided by a cell.

According to an additional aspect of the present invention, if a dormant mode terminal receiving a multicast service performs handover between cells, the multicast service provided by the current cell received from the target base station if the target base station does not support the multicast service. It is characterized by receiving a multicast service packet without interruption using radio bearer information for.

Accordingly, the present invention can minimize the interruption of the multicast service during inter-cell handover of the dormant mode terminal receiving the multicast service, thereby improving the quality of the multicast service.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the embodiments of the present invention may unnecessarily obscure the gist of the present invention.

The terms used throughout the present specification are terms defined in consideration of functions in the embodiments of the present invention, and may be sufficiently modified according to the intention, custom, etc. of the user or operator, and the definitions of these terms are used throughout the specification. It should be made based on the contents.

1 is a block diagram illustrating a mobile communication system configuration for a multimedia broadcasting / multicast service (MBMS), including a base station 110, a mobility management entity 120, a serving gateway 130, and a packet data network gateway ( 140, a multimedia service server 150, an MBMS controller 160, and an MBMS gateway 170.

The base station 110 manages radio resources and is in charge of wired / wireless protocol functions for communication with other nodes. For example, the base station 110 corresponds to an evolved NodeB (eNodeB) in case of an LTE-Advanced system.

The mobility management entity 120 performs the mobility (Mobility) and session management (Session Management) function of the mobile terminal 200. For example, in the case of the LTE-Advanced system, the mobility management entity 120 corresponds to a mobility management entity (MME).

The serving gateway 130 is responsible for the mobility and control of the wired bearer between the base station or homogeneous networks. For example, the serving gateway 130 corresponds to a serving GW (sGW) in the LTE-Advanced system.

The packet data network gateway 140 is responsible for mobility and control of wired bearers between heterogeneous networks. For example, the packet data network gateway 140 corresponds to pGW (PDN GW) in the LTE-Advanced system.

The multimedia service server 150 performs multimedia data service management including storage and transmission of multimedia data provided by a content provider and user authentication for the multimedia data service. For example, the multimedia service server 150 corresponds to a broadcast and multicast service center (BM-SC) in the case of an eMBMS of the LTE-Advanced system.

The MBMS controller 160 receives information for mobility management from the mobility management entity 120 of the mobile communication system 150 and is stored in the multimedia service server 150 using the received information for mobility management. Perform multicast control on multimedia data. For example, the MBMS controller 160 corresponds to MBMS1 in the case of an eMBMS of the LTE-Advanced system.

The MBMS gateway 170 receives a multimedia data service participation request from the packet data network gateway 140 of the mobile communication system 100, and transmits multimedia data according to the multicast control of the MBMS controller 160. Multicast). For example, the MBMS gateway 170 corresponds to MBMS2 in the case of an eMBMS of the LTE-Advanced system.

For example, in the LTE-Advanced system, the Evolved Packet Core (EPC) function related to unicast is composed of MME, sGW, and pGW, and the function of EPC related to multicast is composed of MBMS1, MBMS2, and BM-SC.

The mobile terminal performing the MBMS client function and the application program to accommodate the multicast service communicate with the base station through the LTE-Advanced wireless standard, the base station can communicate with the mobile terminal by applying the LTE-Advanced wireless standard, multicast It communicates with MBMS1 and MBMS2 functions for service packet transmission, and communicates with sGW and MME for message transmission for multicast participation.

The mobile station and the base station follow the LTE-Uu interface, which is based on the radio access standard of the LTE-Advanced system, and supports PTM (Point-to-Multipoint) transmission. The interface between the MBMS2 and the base station is based on IP multicast traffic transmission as a passage for MBMS data transmission, and the control interface between the base station and the MBMS1 is for controlling the MBMS session. In the LTE-Advanced system, for example, the M3AP protocol is used between the base station and the MME. Can be interfaced with

There are two interfaces between the control plan and the data plan between the MBMS2 and the BM-SC. The session control of the MBMS is performed through the control plan, and the MBMS packet is transmitted through the data plan. No specific protocol is defined between the BM-SC and the content provider.

Through such a mobile communication system configuration, the mobile terminal receives a multimedia broadcasting / multicast service (MBMS). The mobile terminal may move with mobility and receive a multicast service.

The configuration of a multicast service continuity providing apparatus for guaranteeing continuity of a multicast service when a mobile terminal in a dormant mode receiving a multicast service (hereinafter, referred to as a dormant mode terminal) performs inter-cell handover will be described with reference to FIG. 2. .

2 is a block diagram according to an embodiment of an apparatus for providing multicast service continuity according to the present invention. As shown in the figure, the multicast service continuity providing apparatus 300 according to this embodiment includes a radio bearer information receiver 310, a service support determination unit 320, and a radio bearer information setting unit 330. It is made to include.

The radio bearer information receiver 310 periodically receives and stores radio bearer information on a multicast service provided by a neighbor cell from a source base station.

The base station periodically broadcasts control information for the MBMS, for example, dormant radio bearer information for the multicast service provided by neighboring cells through the 'MBMS Neighbor Cell PTM RB Information message' included in the control information for the MBMS. It can be provided to the mode terminal.

In the conventional case, the 'MBMS Neighbor Cell PTM RB Information message' was used to provide soft-combining or selective combining information between cells, but in the present invention, a multicast service provided by neighboring cells It is used to provide radio bearer information for.

The dormant mode terminal may periodically receive radio bearer information on a multicast service provided by a neighbor cell from a source base station by receiving MBMS Neighbor Cell PTM RB Information information through an MBMS control channel.

The service support determination unit 320 determines whether the target base station supports the multicast service when a handover occurs while receiving the multicast service packet through the source base station and moves to the target base station.

For example, the determination of whether the target base station supports the multicast service may include determining, by the radio bearer information receiver 310, that the multicast service information provided by the dormant mode terminal is provided by the neighboring cell (target base station) selected by the handover. If it is included in the most recently received MBMS Neighbor Cell PTM RB Information message, it can be determined that the target base station supports the multicast service. Otherwise, it can be determined that the target base station does not support the multicast service. .

The radio bearer information setting unit 330 determines that the target base station supports the multicast service by the service support determining unit 320. The radio bearer information receiving unit 310 receives radio bearer information for the multicast service. Multicast service packet can be received from the target base station immediately after setting the radio bearer information on the multicast service provided by the neighboring cell recently received by < RTI ID = 0.0 >). ≪ / RTI >

Accordingly, when the target base station supports the multicast service, the interruption of the multicast service can be minimized during the inter-cell handover of the dormant mode terminal receiving the multicast service, thereby improving the quality of the multicast service. It becomes possible.

Meanwhile, according to an additional aspect of the present invention, the multicast service continuity providing apparatus 300 further includes a radio bearer information processing unit 340. If it is determined by the service support determination unit 320 that the target base station does not support the multicast service, the radio bearer information processing unit 340 establishes a radio resource control connection with the target base station after establishing a radio resource control connection. Transmits multicast related information for a bearer allocation request to a target base station, receives radio bearer information on a multicast service provided by a current cell from a target base station, and transmits radio bearer information on a multicast service through the radio bearer information setting unit. Process to reset

The radio bearer information processing unit 340 includes a radio resource control connection setting unit 341, a multicast related information transmission unit 342, and a radio bearer information resetting processing unit 343.

If it is determined by the service support determination unit 320 that the target base station does not support the multicast service, the radio resource control connection setting unit 341 establishes a radio resource control connection with the target base station.

If the target base station does not support the multicast service, the multicast service continuity providing apparatus 300 requests the radio base station connection setting unit 341 to request the radio base station bearer information for the multicast service provided by the current cell. Radio resource control (RRC) connection is performed with the target base station.

The multicast related information transmitting unit 342 transmits multicast related information for requesting a radio bearer allocation for a multicast service to a target base station after establishing a radio resource control connection by the radio resource control connection setting unit 341. do.

For example, the MBMS Dedicated Information may be transmitted through an UL Information Transfer message of a multimedia broadcast / multicast service (MBMS) as shown in FIG. 6.

In the conventional UL information transfer (UL Information Transfer) message was used for transmitting a Non Access Stratum (NAS) message, but in the present invention, the multicast-related information (MBMS Dedicated Information) is defined, and the dormant mode terminal uplinks Included in the UL Information Transfer message and transmitted to the target base station.

The radio bearer information resetting processing unit 343 receives radio bearer information for a multicast service provided by a current cell including multicast traffic channel information set from a target base station for establishing a multicast traffic channel, and sets the radio bearer information. Process to reset radio bearer information for the multicast service.

The target base station receiving the MBMS Dedicated Information through an UL Information Transfer message transmits a radio bearer allocation request message (MBMS RB Request) for the multicast service to the MBMS controller.

As shown in FIG. 7, the radio bearer allocation request message (MBMS RB Request) for the multicast service includes a multicast service ID and a cause code.

Upon receiving the radio bearer allocation request message from the target base station, the MBMS controller requests a terminal connection to the target base station, and after receiving a response thereto, reregisters and starts a multicast service and starts a session and a multicast service for the source base station. Handles release and session abort.

After re-registering / deactivating the multicast service and starting / stopping the session, the target base station sets a multicast traffic channel (MTCH), notifies the dormant mode of the change of the traffic channel information, and then sets the multicast traffic. The radio bearer information for the multicast service provided by the current cell including the channel information is transmitted to the dormant mode terminal.

At this time, the radio bearer information on the multicast service provided by the current cell is transmitted through an RRC connection reconfiguration message of a multimedia broadcasting / multicast service (MBMS) as shown in FIG. 8. Can be sent.

Upon receiving the radio bearer information for the multicast service provided by the current cell including the multicast traffic channel information from the target base station, the dormant mode terminal uses this to reestablish the radio bearer connection for the multicast service.

That is, a session for multicast traffic between the target base station and the MBMS gateway is connected at the request of the dormant mode terminal, and the target base station establishes a multicast traffic channel (MTCH) for transmitting a multicast service packet to the dormant mode terminal. In this case, in the conventional case, since the multicast traffic channel information is transmitted through a multicast control channel (MCCH) message periodically broadcasted by the base station, the multicast control channel (MCCH) is broadcasted. During the period, they had to wait about 1 to 10 seconds.

For this reason, the conventional multicast service disconnection time is long. However, in the present invention, the multicast service provided by the current cell in the radio resource control connection reconfiguration message for faster configuration of the multicast traffic channel (MTCH). By transmitting the radio bearer information for the information on the newly set multicast traffic channel (MTCH) is immediately delivered to the dormant mode terminal.

Accordingly, the present invention can minimize the interruption of the multicast service during the inter-cell handover of the dormant mode terminal receiving the multicast service, thereby improving the quality of the multicast service.

Referring to FIGS. 3 to 5, a multicast service continuity providing operation when a dormant mode terminal receiving a multicast service is handed over between cells will be described. 3 is a flowchart illustrating an embodiment of a method for providing multicast service continuity according to the present invention, FIG. 4 is a flowchart illustrating a sleep mode terminal side operation when providing multicast service continuity, and FIG. 5 is a target when providing multicast service continuity. A flowchart illustrating the base station side operation.

The base station periodically broadcasts control information for the MBMS, for example, dormant radio bearer information for the multicast service provided by neighboring cells through the 'MBMS Neighbor Cell PTM RB Information message' included in the control information for the MBMS. Provide to the mode terminal.

Then, in the radio bearer information receiving step (S410) (S510), the dormant mode terminal periodically receives and stores radio bearer information on the multicast service provided by the neighboring cell from the source base station. At this time, radio bearer information on the multicast service provided by the neighbor cell may be received through a multicast control channel (MCCH).

If the dormant mode terminal moves to the target base station while a handover occurs while receiving the multicast service packet through the source base station, the dormant mode terminal performs the multicast service on the target base station in step S420 (S520). Determine if it supports

For example, the determination of whether the target base station supports the multicast service may include determining that the multicast service information provided by the dormant mode terminal from the neighbor cell (target base station) selected by the handover is received (S410) (the radio bearer information). If it is included in the MBMS Neighbor Cell PTM RB Information message most recently received by S510, it is determined that the target base station supports the multicast service. If not, the target base station does not support the multicast service. You can judge.

If it is determined that the target base station supports the multicast service by the service support determination step (S420) (S520), the multicast service being received by the dormant mode terminal in the service support processing step (S430) (S530). Set the radio bearer information for the radio bearer information as the radio bearer information for the multicast service provided by the neighbor cell recently received by the radio bearer information receiving step (S410) (S510) to receive a multicast service packet directly from the target base station. This allows the multicast service packet to be received without interruption.

If it is determined that the target base station does not support the multicast service by the service support determination step (S420) (S520), the dormant mode terminal is wireless with the target base station in the service non-support processing step (S440) (S540). After establishing the resource control connection, transmit the multicast-related information for the radio bearer allocation request for the multicast service to the target base station, and receives the radio bearer information for the multicast service provided by the current cell from the target base station to multicast By resetting radio bearer information for a service, information on a newly set multicast traffic channel (MTCH) is immediately transmitted to a dormant mode terminal so that a multicast service packet can be received without interruption.

Accordingly, the present invention can minimize the interruption of the multicast service during the inter-cell handover of the dormant mode terminal receiving the multicast service, thereby improving the quality of the multicast service. You can achieve your purpose.

On the other hand, when the service non-support processing step (S440) (S540) in detail, if the target base station does not support the multicast service, in order to request the radio bearer information for the multicast service provided by the current cell to the target base station The dormant mode terminal establishes a radio resource control connection (RRC connection) with the target base station in step S441 (S541) (S610).

After the radio resource control connection establishment step (S541) (S610) by the radio resource control connection establishment step (S441), the dormant mode terminal for the radio bearer allocation request for the multicast service in the multicast-related information transmission step (S442). The uplink information transmission message including the multicast related information is transmitted to the target base station (S542). For example, the MBMS Dedicated Information may be transmitted through an UL Information Transfer message of a multimedia broadcasting / multicast service (MBMS) as described above.

In the conventional UL information transfer (UL Information Transfer) message was used for transmitting a Non Access Stratum (NAS) message, but in the present invention, the multicast-related information (MBMS Dedicated Information) is defined, and the dormant mode terminal uplinks Included in the UL Information Transfer message and transmitted to the target base station.

When the uplink information transmission message is transmitted (S542) by the multicast-related information transmission step (S442), the target base station that has received it (S620) transmits to the multicast service to the MBMS controller in the radio bearer allocation request step (S443). Transmits a radio bearer allocation request (MBMS RB Request) message;

At this time, when the target base station receiving the uplink information transmission message determines whether the multicast-related information is included in the uplink information transmission message (S630), the radio bearer allocation request for the multicast service to the MBMS controller ( MBMS RB Request) message is transmitted (S640).

The MBMS controller receiving the radio bearer allocation request message transmitted by the radio bearer allocation request step S443 links the MBMS UE context information to the target base station in the terminal connection step S444. UE linking request (UE Linking Request) (S650), and stores the MBMS UE context (S660), and receives a UE linking response (UE Linking Response) (S660).

After the terminal connection by the terminal connection step (S444), the MBMS controller processes the multicast service re-registration / release and session start / stop in the service re-registration step (S445) (S670). In this UE connection step (S444), the MBMS controller performs multicast service re-registration and session start for the target base station, multicast service release and session stop processing for the source base station (receiving multicast service to the source base station). If there is no user).

After re-registering / unregistering the multicast service by the service re-registration step (S445) and starting / stopping the session, the target base station sets a multicast traffic channel (MTCH) in the multicast traffic channel setting step (S446). (S680).

When the multicast traffic channel is established by the multicast traffic channel setting step (S446), the target base station notifies the dormant mode terminal of the change of traffic channel information (MBMS Info Change) in the traffic channel information change notification step (S447) ( In step S690, the dormant mode terminal receives the fact that the traffic channel information is changed (S543). At this time, the traffic channel information change notification may be included in the paging request (Paging Request) message and broadcast.

Then, after notifying the change of the traffic channel information by the traffic channel information change notification step S447, the multicast traffic set by the target base station by the multicast traffic channel setting step S446 in the radio bearer information transmission step S448. The radio bearer information for the multicast service provided by the current cell including the channel information is transmitted to the dormant mode terminal (S700).

At this time, the radio bearer information on the multicast service provided by the current cell may be transmitted through an RRC connection reconfiguration message of a multimedia broadcasting / multicast service (MBMS) as described above. have.

The sleep mode resetting step (S449) of the dormant mode terminal receiving the radio bearer information for the multicast service provided by the current cell including the multicast traffic channel information transmitted by the radio bearer information transmission step (S448) (S449). In this case, the radio bearer connection for the multicast service is reset (S545).

That is, a session for multicast traffic between the target base station and the MBMS gateway is connected at the request of the dormant mode terminal, and the target base station establishes a multicast traffic channel (MTCH) for transmitting a multicast service packet to the dormant mode terminal. In this case, in the conventional case, since the multicast traffic channel information is transmitted through a multicast control channel (MCCH) message periodically broadcasted by the base station, the multicast control channel (MCCH) is broadcasted. During the period, they had to wait about 1 to 10 seconds.

For this reason, the conventional multicast service disconnection time is long. However, in the present invention, the multicast service provided by the current cell in the radio resource control connection reconfiguration message for faster configuration of the multicast traffic channel (MTCH). By transmitting the radio bearer information for the information on the newly set multicast traffic channel (MTCH) is immediately delivered to the dormant mode terminal.

Accordingly, the present invention can minimize the interruption of the multicast service during the inter-cell handover of the dormant mode terminal receiving the multicast service, thereby improving the quality of the multicast service.

As described above, in the conventional case, an IGMP (Internet Group Management Protocol) join message was transmitted from a dormant mode terminal during inter-cell handover of a dormant mode terminal, and for this purpose, a unicast bearer from a dormant mode terminal. However, in the present invention, the terminal can reduce the signal delay according to the handover notification through the message for radio resource control, and after setting the multicast traffic channel (MTCH) at the target base station, By adding a procedure that can immediately notify the dormant terminal, the dormant terminal can set radio bearer information on the received multicast service without waiting for the Modification Period in which the multicast control channel (MCCH) is broadcast. Multi-cell handover of dormant mode UE receiving multicast service It is possible to minimize the interruption of host service makes it possible to improve the multicast quality of service it is possible to achieve the object of the present invention presented above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. .

The present invention is industrially available in the field of multimedia broadcasting / multicast service (MBMS) technology and its application.

1 is a block diagram showing a mobile communication system configuration for a multimedia broadcasting / multicast service (MBMS);

2 is a block diagram according to an embodiment of an apparatus for providing multicast service continuity according to the present invention;

3 is a flowchart according to an embodiment of a multicast service continuity providing method according to the present invention.

4 is a flowchart illustrating an operation of a sleep mode terminal side in providing multicast service continuity.

5 is a flowchart illustrating an operation of a target base station side in providing a multicast service continuity;

6 is a diagram illustrating a configuration of an uplink information transmission message.

7 is a diagram illustrating a configuration of a radio bearer allocation request message for a multicast service.

8 is a diagram illustrating the configuration of a radio resource control connection reset message.

<Explanation of symbols for the main parts of the drawings>

100: mobile communication system 110: base station

120: mobility management object 130: serving gateway

140: packet data network gateway 150: multimedia service server

160: MBMS controller 170: MBMS Gateway

200: mobile terminal 300: multicast service continuity providing device

310: radio bearer information receiver 320: service support determination unit

330: radio bearer information setting unit 340: radio bearer information processing unit

341: radio resource control connection setting unit 342: multicast related information transmission unit

343: radio bearer information reset processing unit

Claims (7)

A radio bearer information receiver for periodically receiving and storing radio bearer information on a multicast service provided by a neighbor cell from a source base station; A service support determining unit determining whether the target base station supports the multicast service when a handover occurs to the target base station while receiving the multicast service packet through the source base station; If it is determined by the service support determination unit that the target base station supports the multicast service, for the multicast service that provides radio bearer information for the multicast service in the neighbor cell recently received by the radio bearer information receiver. A radio bearer information setting unit configured to receive multicast service packets without interruption by setting as radio bearer information; Apparatus for providing multicast service continuity, characterized in that comprising a. The method of claim 1, The multicast service continuity providing device: If it is determined by the service support determination unit that the target base station does not support the multicast service, after establishing a radio resource control connection with the target base station, multicast-related information for requesting radio bearer allocation for the multicast service is provided. A radio bearer information processor configured to receive a radio bearer information on a multicast service provided by a current cell from a target base station and to reconfigure radio bearer information on a multicast service through the radio bearer information setting unit; Apparatus for providing multicast service continuity further comprising. The method of claim 2, The radio bearer information processing unit: A radio resource control connection setting unit configured to establish a radio resource control connection with the target base station when it is determined by the service support determination unit that the target base station does not support the multicast service; A multicast-related information transmitter for transmitting the multicast-related information for the radio bearer allocation request for a multicast service to a target base station after the radio resource control connection-establisher is established; Receives radio bearer information for a multicast service provided by a current cell including multicast traffic channel information set from a target base station configured with a multicast traffic channel, and transmits radio bearer information for a multicast service through the radio bearer information setting unit. A radio bearer information resetting processing unit for processing to reconfigure; Apparatus for providing multicast service continuity comprising a. The method according to claim 2 or 3, The multicast related information is: Apparatus for providing a multicast service continuity characterized in that it is transmitted through an uplink information transmission message of the multimedia broadcast / multicast service (MBMS). The method according to claim 2 or 3, Radio bearer information for the multicast service provided by the current cell is: Apparatus for providing a multicast service continuity characterized in that it is transmitted through a radio resource control connection reset message of the multimedia broadcast / multicast service (MBMS). A radio bearer information reception step of periodically receiving, by a dormant mode terminal, radio bearer information on a multicast service provided by a neighbor cell from a source cell; Determining whether the dormant mode terminal supports the multicast service if the target base station supports the multicast service when the dormant terminal moves to the target base station while receiving a multicast service packet through the source base station; When it is determined that the target base station supports the multicast service by the service support determination step, radio bearer information on the multicast service being received by the dormant mode terminal is received in the neighbor cell recently received by the radio bearer information reception step. A service support processing step of receiving a multicast service packet without interruption by setting as radio bearer information on a provided multicast service; The multicast service continuity providing method comprising a. The method of claim 6, The multicast service continuity providing method is: If it is determined by the service support determination step that the target base station does not support the multicast service, the dormant mode terminal establishes a radio resource control connection with the target base station, and then multicasts for the radio bearer allocation request for the multicast service. A service non-support processing step of transmitting the related information to the target base station, receiving radio bearer information on the multicast service provided by the current cell from the target base station, and resetting the radio bearer information on the multicast service; The multicast service continuity providing method further comprising.

Images