KR20080097918A - Mehtod and terminal for performing handover in mobile communications system of multimedia broadcast multicast service - Google Patents

Abstract

A method for operating handover in the point to multipoint service mobile communication system and a terminal therefor are provided to enable a terminal between base stations which the terminal will be handed over to transmit and receive information about the point to multipoint service. A method for performing handover from the first base station to the second base station includes the following steps. The first base station decides the handover and transmits a handover request message including the first information related to a point to multipoint service to the second base station. The first base station receives a response message from the second base station. The first base station instructs the terminal to transmit the first information to the second base station through the handover command message, in case the first base station does not receive the second information related to the point to multipoint service from the second base station.

Description

A handover method and a terminal thereof in a point-to-multipoint mobile communication system {MEHTOD AND TERMINAL FOR PERFORMING HANDOVER IN MOBILE COMMUNICATIONS SYSTEM OF MULTIMEDIA BROADCAST MULTICAST SERVICE}

The present invention relates to a point-to-multipoint service, and more particularly, to a method for performing handover in a point-to-multipoint service mobile communication system. Here, the point-to-multipoint service refers to a service that transmits (provides) data to a plurality of receivers (recipients) from one source entity, for example, a multimedia broadcast multicast service (MBMS) (a point-to- multipoint service (eg, MBMS) is one in which data is transmitted from a single source entity to multiple recipients).

1 is a diagram illustrating a network structure of an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) which is a mobile communication system to which the present invention and the present invention are applied. The E-UTRAN system is an evolution from the existing UTRAN system and is currently undergoing basic standardization work in 3GPP. The E-UTRAN system is also called a Long Term Evolution (LTE) system.

The E-UTRAN consists of base stations (hereinafter abbreviated as eNode B or eNB). The eNBs are connected via an X2 interface. The eNB is connected to a user equipment (hereinafter abbreviated as UE) through a wireless interface and is connected to an Evolved Packet Core (EPC) through an S1 interface.

Layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. (Second layer) and L3 (third layer), wherein a physical layer belonging to the first layer provides an information transfer service using a physical channel, and a third layer. The radio resource control layer (hereinafter referred to as RRC) layer located in the layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the network.

2 and 3 illustrate a structure of a radio interface protocol between a terminal based on a 3GPP radio access network standard and an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN). In particular, Figure 2 is a structure of the control plane of the wireless protocol, Figure 3 is a structure of the user plane of the wireless protocol.

The wireless interface protocol of FIGS. 2 and 3 consists of a physical layer, a data link layer, and a network layer horizontally, and vertically a user plane for transmitting data information. It is divided into User Plane and Control Plane for Signaling. The protocol layers of FIGS. 2 and 3 are based on the lower three layers of the Open System Interconnection (OSI) reference model, which are well known in communication systems, and include L1 (first layer), L2 (second layer), It may be classified as L3 (third layer). Hereinafter, each layer of the wireless protocol control plane of FIG. 2 and the wireless protocol user plane of FIG. 3 will be described.

The physical layer, which is the first layer, provides an information transfer service to an upper layer by using a physical channel. The physical layer is connected to the upper medium access control layer through a transport channel, and data between the medium access control layer and the physical layer moves through the transport channel. Then, data is moved between different physical layers, that is, between physical layers of a transmitting side and a receiving side through physical channels. The physical channel is modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.

Medium access control (hereinafter referred to as MAC) of the second layer provides a service to a radio link control layer, which is a higher layer, through a logical channel. The radio link control layer (hereinafter referred to as RLC) layer of the second layer supports reliable data transmission. The function of the RLC layer may be implemented as a functional block inside the MAC layer. In this case, the RLC layer may not exist. In the wireless protocol user plane, the PDCP layer of the second layer reduces the IP packet header size, which includes relatively large and unnecessary control information, for efficient transmission in a low bandwidth wireless section when transmitting IP packets such as IPv4 or IPv6. Yeoju performs Header Compression.

The radio resource control layer (hereinafter abbreviated as RRC) layer located at the top of the third layer is defined only in the control plane, and the configuration and reset of the radio bearer (abbreviated as RB) are performed. It is responsible for the control of logical channels, transport channels and physical channels in relation to configuration and release. In this case, RB means a service provided by the second layer for data transmission between the terminal and the UTRAN. If there is an RRC connection (RRC Connection) between the RRC of the terminal and the RRC layer of the wireless network, the terminal is in the RRC connected mode (Connected Mode), otherwise it is in the RRC idle mode (Idle Mode).

The NAS (Non-Access Stratum) layer located above the RRC layer performs functions such as session management and mobility management.

One cell constituting the eNB is set to one of the bandwidth, such as 1.25, 2.5, 5, 10, 20Mhz to provide a downlink or uplink transmission service to multiple terminals. In this case, different cells may be configured to provide different bandwidths.

The downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information, a Paging Channel (PCH) for transmitting a paging message, and a downlink SCH (Shared Channel for transmitting user traffic or control messages). There is. Traffic or control messages of the downlink point-to-multipoint service (multicast or broadcast service) may be transmitted through the downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the UE to the network includes a RACH (Random Access Channel) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

It is located above the transport channel, and the logical channel mapped to the transport channel is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), and an MBMS point-to-multipoint control channel / MCCH. Multicast Control Channel) and MTCH (MBMS point-to-multipoint Traffic Channel / Multicast Traffic Channel).

4 illustrates a control channel transmission of the prior art.

The physical channel is composed of several subframes on the time axis and several subcarriers on the frequency axis. Here, one sub-frame consists of a plurality of symbols on the time axis. One subframe consists of a plurality of resource blocks, and one resource block consists of a plurality of symbols and a plurality of subcarriers. In addition, each subframe may use specific subcarriers of specific symbols (eg, the first symbol) of the corresponding subframe for a physical downlink control channel (PDCCH), that is, an L1 / L2 control channel. One subframe is 0.5 ms, and a transmission time interval (TTI), which is a unit time for transmitting data, is 1 ms corresponding to two subframes.

The wireless network may perform a counting process to determine the existence of a terminal receiving a specific point-to-multipoint service in a specific cell or to count the number of terminals. In the point-to-many service counting process, when a wireless network transmits an access information message through an MCCH channel, the terminal sends an RRC connection setup message or a cell update message in response to the access information message. Say the process of transmission.

The present invention relates to a wireless terminal for receiving a point-to-multipoint service, and when a terminal subscribed to the point-to-multipoint service moves from a first base station (source eNB) to a second base station (target eNB: target eNB), Point-to-multipoint activated service list is instructed by the base station, and the terminal subscribes to the point-to-multipoint activated service list or information on the point-to-point service received by the first base station according to the instruction (for example, It is to provide a handover scheme for delivering a point-to-multipoint selected service list to a second base station.

In addition, the present invention, when a terminal subscribed to the point-to-multipoint service moves from the first base station to the second base station and receives a handover command from the first base station, the terminal instructs to transfer the point-to-multipoint service information transmission from the first base station to the second base station; And a handover scheme for delivering the point-to-service list subscribed to by the terminal and / or the information on the point-to-point service received from the first base station and other point-to-service information related to the second base station according to the instruction. will be.

In the prior art, the information on the service to be received by the terminal is managed by the base station controller above the base station. Therefore, when the UE moves to different base stations, the base station performs a point-to-multiple service (eg, MBMS service) control function for the terminal according to the information provided by the base station controller. In this case, since the base station should always perform a point-to-many service control function through the base international controller, there may be a delay in the point-to-many service during handover.

An object of the present invention is to eliminate the point-to-many service control function of the base station controller in the prior art, by providing information about the point-to-many service subscribed to the terminal between the base stations to be handed over, the point-to-point is provided to the terminal during handover It is to prevent the delay of service.

In order to achieve the above object, a method for performing handover in a mobile communication system according to the present invention,

A method of performing a handover from a first base station to a second base station when a terminal receiving point-to-multipoint service from a first base station moves to a second base station,

Determining, by the first base station, a handover and sending a handover request message to the second base station, the handover request message including first information related to the point-to-multiple service; Receiving, by the first base station, a response message from the second base station; When the first base station does not receive the second information related to the point-to-multiple service from the second base station through the response message, the first base station to the second base station through the handover command message to the second information It characterized in that it comprises the step of instructing the terminal to deliver.

Preferably, the step of the terminal to synchronize the downlink channel with the second base station; Transmitting, by the terminal, a random access preamble to the second base station; Receiving, by the terminal, the random access response; The terminal further comprises the step of transmitting a handover confirmation message to the second base station.

Preferably, the first information related to the point-to-multipoint service includes at least one of point-to-many service information provided by the first base station and terminal-related point-to-many service information.

Preferably, the terminal-related point-to-multipoint service information includes a point-to-multipoint service list subscribed to by the terminal and a point-to-multipoint service list currently received by the terminal.

Preferably, the point-to-multipoint service information provided by the first base station is control information of the first base station with respect to the point-to-point service and / or the point-to-point service received by the terminal.

Preferably, the second information related to the point-to-point service includes control information of the second base station with respect to the point-to-point service and / or the point-to-point service that the terminal subscribes to. It features.

Preferably, the control information of the second base station is The second Including a random access preamble signature for the point-to-multipoint service used at the base station. It features.

In addition, in order to achieve the above object, a method for performing handover in a mobile communication system according to the present invention,

A method of performing a handover from a first base station to a second base station when a terminal receiving point-to-multipoint service from a first base station moves to a second base station,

Receiving, by the first base station, a response message for a handover request from the second base station;

And instructing the terminal to transmit broadcast service related information to the second base station while the first base station delivers a handover command message to the terminal.

In addition, to achieve the above object, the terminal according to the present invention

A transmitter / receiver including a receiver for receiving a handover command message from a source base station and a transmitter for transmitting point-to-many service information to a target base station according to an instruction of point-to-many service information transmission included in the handover command message;

And a processing unit configured to transmit the point-to-multipoint service information to the target base station when the handover command message indicates the point-to-multipoint service information delivery.

In addition, in order to achieve the above object, a method for performing handover in a mobile communication system according to the present invention,

A method of performing a handover from a first base station to a second base station when a terminal receiving broadcast and multicast service from a first base station moves to a second base station,

Determining, by the first base station, a handover and sending a handover request message to the second base station, the handover request message including first information related to the point-to-multipoint service; Receiving, by the first base station, a response message including second information related to the point-to-multiple service from the second base station; And transmitting, by the first base station, a handover command to the terminal together with the second information.

In addition, the present invention is to prevent the service delay that may occur during the handover, when a terminal subscribed to the point-to-multiple service moves from the first base station to the second base station, the first base station is subscribed to the second base station After transmitting the information on the one-to-many service, the second base station notifies the terminal of the handover completion after receiving the information, and provides the point-to-many service to the terminal according to the information.

In addition, when a terminal subscribed to the point-to-multipoint service moves from the first base station to the second base station, the terminal is instructed to deliver the point-to-multipoint service from the first base station, and according to the instruction, the broadcast service list or the first subscribed to the terminal Information about the point-to-multipoint service received from the 1 base station is transmitted to the second base station.

Preferably, after handing over to the second base station, the terminal transmits the transmission / control information for the point-to-multipoint service received from the first base station and the downlink channel provided for the point-to-multiple service from the first base station to the second base station. To pass.

Preferably, the information is included in a message for requesting handover from the first base station to the second base station.

Preferably, the second base station transmits the control information of the point-to-multipoint service to the first base station by including a response message for the handover request.

Preferably, the control information of the point-to-multipoint service includes MCCH channel setting / transmission information provided by a cell of a second base station and channel information on the service.

According to the present invention, when a terminal subscribed to a point-to-multiple service moves from a first base station to a second base station, the terminal is instructed to transmit point-to-multiple service information from the first base station, and the terminal subscribes to the broadcast service list according to the instruction. Alternatively, information on the point-to-multipoint service received by the first base station is transmitted to the second base station, thereby preventing a service delay that may occur during handover.

The present invention is applied to a point-to-multiple service system in wireless communication. However, the present invention is not limited thereto and may be applied to all systems and methods to which the technical spirit of the present invention can be applied.

The basic concept of the present invention is a base station controller (hereinafter, referred to as a base station controller) when a user handovers from a first base station (source base station) to a second base station (target base station) in a multimedia broadcast multicast service (MBMS). In order to solve the delay of the MBMS service due to the control function performed by the base station controller (BSC), control information about the MBMS service and the MBMS between the base stations (ie, the source base station and the target base station) where the handover is performed and the terminal By exchanging service information, it replaces the control function of the base station controller which caused the conventional service delay. That is, according to the present invention, first, the first base station MBMS service information (for example, MBMS activated service list) that the terminal subscribes to the second base station to which the terminal is going to hand over and / or MBMS service information currently received (for example For example, the terminal transmits an MBMS selected service list, or the terminal receives an instruction from the first base station and delivers MBMS service information subscribed to the terminal and / or information on the MBMS service received from the first base station to the second base station. will be. Second, when the terminal is handed over from the first base station to the second base station, the second base station provides the MBMS service to the terminal based on MBMS service information subscribed to the terminal and / or MBMS service information currently received by the terminal. To provide.

Meanwhile, in terms described in the present invention, "MBMS activated services" in the MBMS service information (for example, MBMS activated service list) subscribed to by the terminal is a broadcast service of interest to the terminal and the terminal. MBMS activated services: the MBMS multicast services the UE has joined as well as the broadcast services the UE is interested in). In addition, in the MBMS service information (for example, MBMS selected service list), the term "MBMS selected services" indicates that the UE informs UTRAN that the service has been selected (MBB activated MBMS activated services) for applying an RRC procedure. MBMS Selected Services: a subset of the MBMS activated services of (the Broadcast type) for which the UE applies RRC procedures to inform UTRAN that the service has been selected (by upper layers)).

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention.

5 is a signal flow diagram illustrating a handover process of a terminal receiving an MBMS service according to the present invention.

Referring to FIG. 5, the terminal 100 receives an MCCH channel and an MTCH channel for a specific service (that is, a specific MBMS service) from the source base station 200 (S1). The MCCH channel is a channel for transmitting MBMS service related control information, and the MTCH channel is a channel for transmitting data for a specific MBMS service.

The terminal 100 is currently moving from a base station (ie, a source base station) to another base station (ie, a target base station). The mobile station, as the information for handover determination, sends a measurement report to the source eNB 200 (S2). The source base station 200 determines the handover of the terminal based on the measurement report (S3) ("HO (Hand Over) Decision" in FIG. 5).

The source base station 200 requests a handover of the terminal to a target eNB 300 (“Handover Request” in FIG. 5) (S4). At this time, the source base station 200 transmits the MBMS service information (for convenience, referred to as 'A information') and the terminal related MBMS service information (for convenience, referred to as 'B information') provided to the target base station 300. do. Here, the terminal-related MBMS service information (ie, B information) may be, for example, an MBMS service list (ie, MBMS activated service list) subscribed to by the terminal and a point-to-point service list currently received by the terminal 100 ( That is, the MBMS selected service list) is included. In addition, the MBMS service information (ie, A information) provided by the source base station 200 may be controlled by the source base station 200 with respect to the service subscribed to and / or received by the terminal 100 (eg, For example, the transmission rate of the MTCH, the transmission period of the MCCH, the MTCH scheduling information, HARQ information including the number of retransmissions, etc.) may be included.

The target base station 300 transmits a response (“Handover Request Ack” in FIG. 5) to the source base station 200 in response to the handover request of the terminal (S5). In this case, the response message (that is, "Handover Request Ack") is the control information of the target base station 300 for the service that the terminal 100 subscribed to and / or the service (referred to as "C information" for convenience) ). The control information (ie, C information) of the target base station 300 may include, for example, MCCH configuration information and MCCH transmission period, MTCH configuration information and MTCH scheduling information, HARQ information of MTCH, information of an uplink feedback channel for MBMS, and the like. It includes. In addition, the control information (ie, C information) includes a random access preamble signature (Random Access Preamble Signature) for the specific service used in the target base station 300. Meanwhile, the control information (ie, A information) of the source base station 200 and the control information (ie, C information) of the target base station 300 are different from each other.

The source base station 200 transmits a handover command message ("Handover Command") to the terminal 100 to instruct a handover to the target base station 300 (S6). In this case, the handover command message includes control information (ie, C information) received from the target base station 300 for the service subscribed to and / or received by the terminal. In addition, the handover command message includes a random access preamble signature for the specific service (ie, specific MBMS service) delivered by the target base station 300.

In another embodiment of the present invention, if the target base station 300 does not transmit the control information (ie, C information) to the source base station 200 in the step (S5) (or, the source base station is When the control information, that is, the C information is not received from the target base station, in step S6, the source base station 200 transmits the terminal-related MBMS service information (ie, B information) to the target base station 300. The terminal 100 may be instructed (commanded) through the overcommand message. In addition, the source base station 100 may transmit MBMS service information (ie, A information) provided by the source base station to the terminal 100 through the handover command message, and also transmit the information (ie, A information) to the target base station. 300 may be instructed to deliver. That is, the terminal 100 of the present invention is the indication included in the handover command message from the source base station 200 (ie, the terminal-related MBMS service information (ie, B information) and / or information of the source base station (ie, A information ) Is transmitted to the target base station, and at least one of the A information and the B information can be directly transmitted to the target base station to be handed over. Thus, during handover, the source base station 200 does not have to transmit point-to-multiple service information (eg, A information and / or B information) to the target base station 300. This means that the handover between the source base station 200 and the target base station 300 during handover. By saving resources associated with the point-to-multipoint service information transmission, resource efficiency can be improved.

The terminal 100 may continuously receive the MCCH channel and the MTCH channel for the specific service from the source base station 200 until it moves to the target base station 300 (S7).

The terminal 100 receiving the handover command message of step S6 performs a handover. That is, the terminal 100 moves to the target base station and synchronizes a downlink channel (S8). The terminal 100 may receive the MCCH channel and the MTCH channel for the specific service from the target base station 300 after synchronization of the downlink channel (S9). That is, the terminal 100 receives the specific service received from the source base station 100 from the target base station 300.

The terminal 100 transmits a random access preamble to the target base station 300 using the random access preamble signature included in the handover command message (S10). The target base station 300 responds to the random access preamble (“Random Access Response” in FIG. 5) (S11).

In addition, the terminal 100 transmits a handover confirmation message (Handover Confirm) to the target base station 300 (S12).

On the other hand, as another embodiment of the present invention, if there is a transmission instruction (command) of the terminal-related MBMS service information to the target base station 300 in the handover command message of the step (S6), the terminal 100 The UE transmits MBMS service information (ie, B information) related to the UE in the handover decision message. Here, the terminal-related MBMS service information, like the information of the step (S4), includes a point-to-many service list subscribed to the terminal 100 and a point-to-many service list currently being received. In addition, the handover command message may transfer MBMS service information (ie, A information) provided by the source base station 200 to the target base station 300.

Hereinafter, the configuration and function of the terminal according to the present invention will be described with reference to FIG. 6.

 6 is a schematic block diagram of a terminal according to the present invention.

Terminal 100 according to the present invention is a comprehensive device including all devices that can use the MBMS service. Accordingly, the terminal according to the present invention includes all mobile communication terminals (for example, mobile phones, mobile phones, DMB phones, camera phones, etc.) that can use the MBMS service, and all other electronic products that can use the MBMS service, that is, game consoles; Laptops, desktop computers, and home appliances.

The terminal 100 according to the present invention includes essential hardware for implementing the above-described technical features of the present invention, software, and a module (apparatus) including the software. Hereinafter, the configuration and function of the terminal according to the present invention.

For example, the terminal of the present invention includes a receiving unit for receiving a handover command message from the source base station 200 and an instruction for delivering point-to-multiple service information included in the handover command message (for example, a kind of indicator or parameter). And a transmitter / receiver 110 including a transmitter for transmitting point-to-multipoint service information to the target base station 300; A processing unit 120 for analyzing the handover command message and checking whether the message has an instruction for point-to-many service information transmission, and transmitting the point-to-many service information to a target base station 300 when the instruction is indicated. It is configured by. Here, the point-to-multipoint service information is as described with reference to FIG. 5. That is, the point-to-multipoint service information includes at least one of terminal-related MBMS service information (ie, B information) and MBMS service information (ie, A information) provided by the source base station 200. The terminal-related MBMS service information (ie, B information) includes a point-to-many service list subscribed to by the terminal 100 and a point-to-many service list currently being received.

In addition, the terminal 100 according to the present invention includes a display and a speaker as an output device; A keypad and a microphone as an input device; A battery for supplying power to the terminal; The terminal includes basic hardware and software (or a module including the software) of the terminal, such as a storage device (memory) storing a list of mobility protocols that the terminal can support. Description of each function of these components will be apparent to those skilled in the art, and thus will be omitted.

On the other hand, the method according to the invention described so far may be implemented in software, hardware, or a combination thereof. For example, the method according to the present invention may be stored in a storage medium (eg, mobile terminal internal memory, flash memory, hard disk, etc.) and may be stored in a processor (eg, mobile terminal internal microprocessor). It may be implemented as codes or instructions in a software program that can be executed by.

In the above, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary and will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. . For example, a mobile communication system including the configuration as shown in FIG. 5 of the present invention can be implemented, and each component of FIG. 5 can implement the present invention through a processor and a module for processing each signal. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a network structure of an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) which is a mobile communication system to which the present invention and the present invention are applied.

2 is a control plane structure of a Radio Interface Protocol (Radio Interface Protocol) between a UE and a UTRAN (UMTS Terrestrial Radio Access Network) based on the 3GPP radio access network standard.

3 is a user plane structure of a radio interface protocol (Radio Interface Protocol) between a terminal and a UTRAN (UMTS Terrestrial Radio Access Network) based on the 3GPP radio access network standard.

4 illustrates a control channel transmission of the prior art.

5 is a signal flow diagram illustrating a handover process of an MBMS terminal according to the present invention.

6 is a schematic block diagram of a terminal according to the present invention.

Claims (16)

A method in which handover is performed from a first base station to a second base station, Determining, by the first base station, a handover and sending a handover request message to the second base station, the handover request message including first information related to point-to-multiple services; Receiving, by the first base station, a response message from the second base station; If the first base station does not receive the second information related to the point-to-multiple service from the second base station through the response message, the first base station to the second base station through the handover command message to the first information And instructing the terminal to deliver the handover method in a mobile communication system. The method of claim 1, Synchronizing the downlink channel with the second base station by the terminal; Transmitting, by the terminal, a random access preamble to the second base station; Receiving, by the terminal, the random access response; And transmitting, by the terminal, a handover confirmation message to the second base station. The method of claim 1, wherein the first information related to the point-to-multipoint service is Point-to-many service information provided by the first base station; And at least one of the terminal-related point-to-multipoint service information. The method of claim 3, wherein the point-to-multipoint service information provided by the first base station is Method for performing a handover in a mobile communication system, characterized in that the control information of the first base station for the point-to-point service and / or the point-to-point service to which the terminal subscribes. The method of claim 3, wherein the terminal-related point-to-multipoint service information And a point-to-many service list subscribed to by the terminal and a point-to-many service list currently received by the terminal. The method of claim 4, wherein the control information is A mobile communication system comprising a transmission rate of an MTCH (MBMS Traffic Channel), a transmission period of an MBMS Control Channel (MCCH), MTCH scheduling information, and HARQ (Hybrid Auto Repeat reQuest) information including retransmission times. How to perform a handover in. The method of claim 1, wherein the second information related to the point-to-many service is It includes the control information of the second base station for the point-to-point service and / or the point-to-point service that the terminal subscribed to A method for performing handover in a mobile communication system characterized by the above. The method of claim 7, wherein the control information of the second base station is Includes MCCH (MBMS Control Channel) configuration information, MCCH transmission period, MTCH (MBMS Traffic Channel) configuration information, MTCH scheduling information, MTCH HARQ (Hybrid Auto Repeat reQuest) information, and uplink feedback channel information for MBMS. A method for performing handover in a mobile communication system, characterized in that the. The method of claim 7, wherein the control information of the second base station is The second Including a random access preamble signature for the point-to-multipoint service used at the base station. A method for performing handover in a mobile communication system characterized by the above. A method in which handover is performed from a first base station to a second base station, Receiving, by the first base station, a response message for a handover request from the second base station; Performing a handover in a mobile communication system, wherein the first base station instructs the terminal to deliver point-to-multiple service related information to the second base station while transmitting a handover command message to the terminal. Way. 11. The method of claim 10, wherein the point-to-multipoint service related information Point-to-many service information provided by the first base station; And at least one of the terminal-related point-to-multipoint service information. A transmitting and receiving unit including a receiving unit for receiving a handover command message from a source base station, and a transmitting unit for transmitting the point-to-many service information to a target base station according to the instruction for delivering point-to-many service information included in the handover command message; And a processing unit for processing to transmit the point-to-multipoint service information to the target base station when the handover command message indicates the point-to-multipoint service information delivery. The terminal of claim 12, wherein the handover command message further includes point-to-many service information provided by the source base station. The method of claim 12, wherein the point-to-multipoint service information is And the terminal-related point-to-multipoint service information. The method of claim 13, wherein the point-to-multipoint service information is And point-to-multipoint service information and terminal-related point-to-multipoint service information provided by the source base station. The method of claim 12, wherein the point-to-multipoint service information is Terminal included in the handover confirmation message is transmitted.

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