KR20150017883A - Method and Apparatus for System Information Delivery - Google Patents

Abstract

According to an embodiment of the present invention, a method for delivering system information in a dual connectivity situation includes: a step in which a master eNB (MeNB) delivers a change in a system information block (SIB) of the master eNB to a secondary eNB (SeNB); and a step in which the secondary eNB delivers the change in the system information block of the master eNB to user equipment.

Description

TECHNICAL FIELD The present invention relates to a method and apparatus for transmitting system information,

The present invention relates to a method and apparatus for transmitting system information to a terminal in a wireless communication system.

In a wireless communication system such as LTE (Long Term Evolution) or LTE-A (LTE Advanced), a BS transmits system information to a UE. System information is information repeatedly broadcast by the network, which is the information that the terminal needs to know in order for the terminal to access the cell and to operate properly within the network and within a particular cell. The system information may include information on downlink and uplink cell bandwidths, downlink / uplink settings for TDD (Time Division Duplex), detailed parameters related to random access, uplink power control, and the like.

System information delivered from the base station to the terminal may be delivered in two ways through two different transport channels. System information called a master information block (MIB) can be transmitted through a PBCH (Physical Broadcast Channel). A major part of the system information corresponding to different SIBs (System Information Blocks) can be transmitted through PDSCH (Physical Downlink Shared Channel).

On the other hand, a small cell is considered to overcome the network overload problem caused by the explosion of mobile data traffic. When a small cell is applied, the UE may be operated by receiving resources from two or more base stations connected to a non-ideal backhaul. In this case, the base station may need to transmit its system information as well as other base station system information.

It is an object of the present invention to provide a method and apparatus for transmitting system information to a terminal in a wireless communication system. More particularly, the present invention relates to a method of transmitting a system information block (SIB) change to a master base station (Master eNB, MeNB) through a secondary base station (Secondary eNB, SeNB) And an object of the present invention is to provide a device.

 According to an embodiment of the present invention, there is provided a method for transmitting system information executed in the master base station in a system including a master base station capable of communicating with a terminal through a secondary base station and a secondary base station, Block, SIB) to the secondary base station, and informing the secondary base station of an indicator informing that the SIB of the master base station has changed and information on the changed part of the master base station in the SIB. Provides a system information transfer method.

According to another embodiment of the present invention, there is provided a system information transmitting method executed by the secondary base station in a system including a master base station capable of communicating with a terminal through a secondary base station and the secondary base station, Receiving an indication of a change in a System Information Block (SIB) and information on a changed part in the SIB of the master base station; Configuring paging information to inform that the SIB of the master base station has changed and signaling specified by the terminal to inform the changed part of the SIB of the master base station; And transmitting the paging information and the signaling to the MS.

According to another embodiment of the present invention, there is provided a method of changing system information of a terminal in a system including a master base station capable of communicating with the terminal through the secondary base station and the secondary base station, Receiving paging information for informing that the information block (SIB) has changed and signaling specified for the terminal to inform the changed part of the SIB of the master base station; And changing the SIB information setting for the master base station in the SIB modification period after receiving the paging information and the signaling.

Another embodiment of the present invention is a system including a master base station capable of communicating with a terminal through a secondary base station and the secondary base station, wherein a change in a system information block (SIB) of the master base station And a secondary base station communication unit for transmitting an indication to the secondary base station indicating that the SIB of the master base station has changed and information about a changed part in the SIB of the master base station.

According to another embodiment of the present invention, there is provided a system including a master base station capable of communicating with a terminal through a secondary base station and the secondary base station, the system information block (SIB) of the master base station An indicator indicating that the master base station has changed and an information about a changed part in the SIB of the master base station; A controller configured to configure paging information for informing that the SIB of the master base station has changed and signaling for the terminal to inform the changed part of the SIB of the master base station; And a terminal communication unit for transmitting the paging information and the signaling to the terminal.

A secondary base station and a secondary base station, the secondary base station including paging information for informing that the system information block (SIB) of the master base station has changed from the secondary base station, A communication unit for signaling the terminal to inform a changed part of the SIB of the master base station; And a controller for changing the SIB information setting for the master base station in a next SIB modification period after receiving the paging information and the signaling.

According to the present invention, the terminal acquires a system information block (SIB) change for the master base station (Master eNB, MeNB) in a dual connectivity situation through a secondary base station (Secondary eNB, SeNB) can do.

1 shows a network configuration in an LTE system.
2 to 5 show examples of scenarios in which a small cell is applied.
6 shows an example in which MeNB and SeNB communicate with a terminal in a TDM manner in a double access situation.
7 shows an example of communicating with a terminal via SeNB in a double connection situation.
8 is a flowchart illustrating a method of transmitting a system information block according to an embodiment of the present invention.
9 is a flowchart illustrating a method of transmitting a system information block according to another embodiment of the present invention.
10 is a block diagram illustrating a configuration of a MeNB according to an embodiment of the present invention.
11 is a block diagram showing a configuration of an SeNB according to an embodiment of the present invention.
12 is a block diagram showing a configuration of a terminal according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 shows a network configuration in an LTE system.

1, a user equipment (UE) 10 is a comprehensive concept of a terminal in a wireless communication. It is a UE (User Equipment) in WCDMA, LTE, HSPA, , A user terminal (UT), a subscriber station (SS), a wireless device, and the like.

An evolved Node-B (eNB) 20 performs uplink and downlink communications with the UE 10. The base station 20 is a station that generally communicates with the terminal 10 and includes a Node-B, an evolved Node-B, an eNodeB, a sector, a site, a BTS (Base Transceiver System), an access point (Access Point), a relay node (Relay Node).

The base station 20 includes various coverage areas such as a megacell, a macrocell, a microcell, a picocell, a femtocell, a small cell, a radio resource head (RRH), and a relay node communication range.

The base station 20 may be referred to as a Transmission Point (TP) in terms of transmitting downlink communication to the terminal 10 and may be referred to as a Reception Point , RP), or may be referred to as a Point or a Transmission and Reception Point.

In this specification, a cell may refer to a component carrier (CC) having a coverage of a signal transmitted from a transmitting / receiving end and a signal transmitted from a transmitting / receiving end, or a transmitting / receiving end itself.

The MME (Mobility Management Entity) 30 is an entity that manages the mobility of the EPC (Evolved Packet Core). The MME 30 may perform network mobility signaling, and may provide location registration and paging processing for idle terminals, network selection such as S-GW, P-GW.

The S-GW (Serving Gateway) 40 connects the EPC to the LTE RAN (Radio Access Network). The S-GW 40 becomes a mobility anchor point between the base station 20 and the 3GPP network and can perform routing and forwarding by switching packet data to the new base station 20 at the time of handover. In addition, the S-GW 40 can buffer packets and notify the MME 30 when the user is in the idle mode. The S-GW 40 manages the uplink / downlink data packet transmission layer and can provide a charging function.

A Packet Data Network Gateway (P-GW) 50 connects the user plane data connected to the EPC to the Internet. The P-GW 50 serves as a mobility anchor point between the 3GPP network and the Non-3GPP network, performs charging and bearer QCI (QoS Class Identifier) policies according to policies, and performs packet filtering functions, IP allocation to users, Lt; RTI ID = 0.0 > 40 < / RTI >

Meanwhile, a small cell using a low power node is considered as a means for coping with a mobile traffic explosion. Low power nodes typically represent nodes that use lower transmit (Tx) power than macro nodes.

In technologies prior to 3GPP Release 11, a small cell could be constructed using a low-power radio resource control (RRH) that is a geographically dispersed antenna within macro cell coverage.

However, in the above description, the macro cell and the RRH cell are constructed so as to be scheduled under the control of one base station, and an ideal backhaul is required between the macro cell node and the RRH. An ideal backhaul is a backhaul that has very high throughput and very little delay, such as a dedicated point-to-point connection using optical fiber, Line Of Sight (LOS) microwave. On the flip side, a backhaul with relatively low throughput and large delay characteristics, such as Digital Subscriber Line (xDSL) and Non-LOS microwave, is called a non-ideal backhaul.

The presently considered small cell technology is intended to be applied not only to ideal backhaul but also to non-ideal backhaul.

Figures 2-5 illustrate a small cell deployment scenario that may be considered.

Figure 2 shows a small cell deployment scenario 1. The scenario 1 in Fig. 2 shows a case where a macro cell and a small cell (or a small cell cluster with a small cell) operate in the same frequency band F1.

Figure 3 shows the small cell deployment scenario 2a. Scenario 2a in Fig. 3 shows a case where macro cells and small cells (or small cell clusters) operate in different frequency bands. That is, in Fig. 3, the macro cell operates in the frequency band F1 and the small cell operates in the frequency band F2. Particularly, scenario 2a shows a case where a small cell (or a small cell cluster) operates in an outdoor environment.

Figure 4 shows a small cell deployment scenario 2b. Scenario 2b of Fig. 4 shows a case where macro cells and small cells (or small cell clusters) operate in different frequency bands. That is, in Fig. 4, the macro cell operates in the frequency band F1 and the small cell operates in the frequency band F2. In particular, scenario 2b shows a case where a small cell (or a small cell cluster) operates in an indoor environment.

Figure 5 shows a small cell deployment scenario 3. The scenario 3 of FIG. 5 shows a case where only the small cell cluster operates without an macrocell in an indoor environment.

It may be considered to use dual connectivity (or may be referred to as anchor mode) technique in a small cell environment. A dual access means that the terminal operates by receiving resources from at least two different base stations connected by a non-ideal backhaul.

The system using the dual access technology may include a master base station (Master eNB, MeNB) and at least one secondary base station (Secondary eNB, SeNB). Alternatively, MeNB may be referred to as a macro base station (Macro eNB), and SeNB may be referred to as a small base station (Small eNB).

MeNB refers to a base station that operates as a mobility anchor by maintaining at least the S1-MME interface with a core network (CN) in a dual access situation. MeNB may also be referred to as an anchor.

SeNB refers to a base station that is not MeNB and provides additional resources in a dual access situation.

MeNB may be a macro cell base station and SeNB may be a small cell base station. Alternatively, both MeNB and SeNB may be small cell base stations. For example, when only a small cell is arranged as in the scenario 3 of Fig. 5, both MeNB and SeNB can be small cell base stations.

When the macro cell base station and the small cell base station operate in the same frequency band as in the scenario 1 of FIG. 2 described above, interference occurs between the macro cell base station and the small cell base station, . Also, since a small cell is likely to be installed with a large number of base stations such as a cluster, frequent handover can occur, thereby increasing the signaling load in the core network. To solve such a problem, it is possible to perform an operation in the form of a double connection.

In the double access situation, MeNB can perform data communication directly with the terminal or through the backhaul connected SeNB. Also, the MeNB can perform some mobility management of the terminal. Frequent handover may occur in a small cell environment, which may place a heavy load on a core network (for example, MME) that performs mobility management. In this case, the MeNB can perform a part of the mobility management function of the MME to reduce the load on the MME.

6 shows an example in which MeNB and SeNB communicate with a terminal in a TDM manner in a double access situation. Referring to FIG. 6, a terminal 610 can be connected to a communication between a MeNB 620 and a SeNB 630 in a TDM (Time Division Multiplexing) manner. For example, at a specific time, downlink data is forwarded from the MeNB 620 to the SeNB 630, then transmitted from the SeNB 630 to the terminal 610, and downlink data is transmitted directly from the MeNB 620 And transmitted to the terminal 610.

7 shows an example of communicating with a terminal via SeNB in a double connection situation. Referring to FIG. 7, downlink data is forwarded from the MeNB 720 to the SeNB 730, and then transmitted from the SeNB 730 to the terminal 710.

6 and 7, the UE may be in the Connected state with MeNB and / or SeNB and Radio Resource Control (RRC). The RRC Connected state may refer to the following states.

- The terminal has Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) -RRC connection.

- The terminal has a context in the E-UTRAN.

- The E-UTRAN knows which cell the terminal is located in.

- The network can perform data transmission / reception with the terminal.

- The network can perform handover to the terminal.

The UE performs neighbor cell measurement.

- At the Packet Data Convergence Protocol (PDCP) / Radio Link Protocol (RLC) / Medium Access Control (MAC) level, the terminal can transmit and receive data to and from the network, and the terminal can communicate with the network through a shared channel The UE monitors any control signaling, and the UE reports channel quality information and feedback information to the BS, and DRX (Discontinuous Reception) can be set for power saving of the UE, and the BS performs the setting.

A terminal operating in a dual connection may need to acquire both system information blocks of MeNB and SeNB. However, if the system information block for the MeNB changes in a situation where a terminal operating in a dual connection communicates with the SeNB and does not communicate with the MeNB, the terminal may not receive information on the change in the system information block for the MeNB have. For this case, it is possible to consider a method of transmitting information on the change of system information block to MeNB through SeNB.

In one embodiment, consideration is given to the case where the UE is formed by a dual connection with an RRC connection with the MeNB initially. For example, when the terminal is operating within the coverage of the MeNB and the communication with the SeNB is more important than the communication with the MeNB, the terminal performs most of the data communication with the SeNB, (Or anchor mode). ≪ / RTI >

8 is a flowchart illustrating a method of transmitting a system information block according to an embodiment of the present invention.

8, the UE acquires system information blocks of the MeNB and performs SIB acquisition (S802), and the UE enters the RNC connected state with MeNB through an establishment and reconfiguration process from the MeNB S804).

The MeNB determines whether the SeNB can be set in a double connection (or an anchor mode) for the corresponding terminal (S806). For example, the MeNB determines whether the SeNB can be set to the UE based on the measurement report of the UE based on the dual access.

If the terminal is able to establish SeNB with a dual connection, the MeNB sets up a dual connection (or an anchor mode) configuration for the terminal (S808). The UE receiving the configuration information enters the RRC connected state with the SeNB based on the configuration information (S810).

Thereafter, when a change occurs in the system information block of the MeNB in a state where the terminal maintains the dual connection (or an anchor mode) state (S812), the MeNB informs the change information of the indicator and the indicator indicating that the system information block has changed To the SeNB (S814).

The SeNB constructs paging information for informing that the system information block of the MeNB has changed and configures a dedicated signaling for informing the changed part of the system information block (S816). The information may include modified system information and a modification indicator for modifying the MeNB system information. The changed portion of the system information block may be deleted, changed or added in the existing SIB. For example, when the information of the existing system information block (for example, the information received from the terminal MeNB in step S810) is A, B, and C, the changed part is a case where specific information such as A and B is deleted Or may be a case where the value of specific information such as A, B, C 'is changed or a case where specific information such as A, B, C and D is added.

The SeNB transmits the information configured in step S816 to the terminal (S818). In step S820, the MS changes the system information block information setting in the next system information block change period of the current system information block change period (SIB modification period) upon receiving the system information change message for the MeNB.

In another embodiment, at the time of changing the system information block information setting, the terminal may change the system information block information setting in the current system information block change period in which the change message of the system information for the MeNB is received. In this embodiment, the synchronization of the change period of the MeNB system information may be discordant between the MeNB and the UE in a situation where the SIB change system information block change of the MeNB delivered to the UE is delayed by the non-ideal backhaul and arrived at the UE. Therefore, it is possible to immediately perform the system information block change at the present time instead of the next system information block change period. The present embodiment may additionally include a time indicator indicating a time at which the MeNB changes the SIB change system in step S818. As an example of the time indicator, a system frame number of the change period may be transmitted.

In another embodiment, consideration is given to the case where the terminal is formed by a double connection with the first RN connection with the SeNB. For example, if the UE is in an anchor mode while the UE is communicating in the RRC connected state through the initial connection to the SeNB, the SeNB maintains the MeNB as an anchor base station and transmits a signaling load Lt; RTI ID = 0.0 > mobility robustness. ≪ / RTI >

9 is a flowchart illustrating a method of transmitting a system information block according to another embodiment of the present invention.

Referring to FIG. 9, the UE enters the RRC connected state with the SeNB through establishment, reconfiguration, etc. from the SeNB (S902).

The SeNB determines whether the terminal can be set to a dual connection (or an anchor mode) (S904). For example, the SeNB determines whether the terminal can establish a dual connection based on the measurement report of the terminal.

If the terminal can establish a dual connection, the SeNB sets up a dual connection (or an anchor mode) configuration for the terminal, provides information on the system information block of the MeNB (S906) (S908).

At this time, the SeNB may have information on the system information block of MeNB. In one example, the exchange of information about the system information blocks between MeNB and SeNB may occur periodically. In another example, the SeNB may be triggered when there is a terminal operating in an anchor mode in the SeNB, and the MeNB may request information to be provided to the MeNB, and the MeNB may provide information on the system information block to the SeNB.

In step S904, information on the system information block of the MeNB provided by the SeNB to the UE is information of the entire system information block of the MeNB, or basic information for maintaining an anchor with the MeNB (e.g., cell ID, S -MAC information, etc.), or information for establishing an RRC connection (for example, SIB2 information).

Thereafter, when a change in the system information block of the MeNB occurs while the terminal is in a dual connection (or an anchor mode) state (S910), the MeNB transmits an indicator indicating that the system information block has been changed, Information to the SeNB (S912).

The SeNB constructs paging information for informing that the system information block of the MeNB has changed and configures a dedicated signaling for informing the changed part of the system information block (S914). The changed portion of the system information block may be deleted, changed or added in the existing SIB. For example, when the information of the existing system information block (for example, the information received from the terminal MeNB in step S906) is A, B, and C, the changed part is the case where specific information such as A and B is deleted Or may be a case where the value of specific information such as A, B, C 'is changed or a case where specific information such as A, B, C and D is added.

The SeNB transmits the information configured in step S914 to the terminal (S916). In step S918, the UE changes the system information block information setting in the next system information block change period of the current system information block change period (SIB modification period) upon receiving the system information change message for the MeNB.

In another embodiment, at the time of changing the system information block information setting, the terminal may change the setting of the system information block information in the current system information block change period in which the change message of the system information about the MeNB is received. In this embodiment, the synchronization of the change period of the MeNB system information may be discordant between the MeNB and the UE in a situation where the SIB change system information block change of the MeNB delivered to the UE is delayed by the non-ideal backhaul and arrived at the UE. Therefore, it is possible to immediately perform the system information block change at the present time instead of the next system information block change period. The embodiment may additionally include a time indicator indicating a time at which the MeNB changes the SIB change system in step S916. As an example of the time indicator, a system frame number of the change period may be transmitted.

10 is a block diagram illustrating a configuration of a MeNB according to an embodiment of the present invention.

Referring to FIG. 10, the MeNB 1000 includes a control unit 1010 and a SeNB communication unit 1020.

The control unit 1010 performs an operation as an anchor in a double connection mode (or an anchor mode).

When a change occurs in the system information block of the MeNB, the SeNB communication unit 1020 can transmit to the SeNB information indicating the change of the system information block of the MeNB in the SeNB and information of the changed part in the system information block of the MeNB.

In addition, the SeNB communication unit 1020 can transmit information on the system information block of the MeNB to the SeNB. The SeNB communication unit 1020 may periodically transmit information on the system information block to the SeNB or may transmit information on the system information block when there is an information provision request from the SeNB. The SeNB communication unit 1020 transmits basic information (e.g., cell IDA, S-MAC, etc.) for maintaining the anchoring, transmits the information of the entire system information block of the MeNB to the SeNB, Information (for example, SIB2 information).

11 is a block diagram showing a configuration of an SeNB according to an embodiment of the present invention.

Referring to FIG. 11, the SeNB 1100 includes a control unit 1110, a MeNB communication unit 1120, and a terminal communication unit 1130.

The MeNB communication unit 1120 can receive from the MeNB an indicator for indicating that the system information block of the MeNB has changed and information about the changed part in the system information block of the MeNB. The control unit 1110 may configure paging information indicating that the SIB of the MeNB has changed and signaling specified in the terminal to notify the changed part in the system information block of the MeNB and the terminal communication unit 1130 may transmit the paging information Information and signaling to the terminal.

In addition, when the terminal and the SeNB become RRC connected, the terminal communication unit 1130 can transmit information on the system information block of the MeNB to the terminal. Information on the system information block of the MeNB may be periodically transmitted from the MeNB to the SeNB, or may be transmitted from the MeNB to the SeNB when there is a request from the SeNB. The information on the system information block of the MeNB may be information on the entire system information block of the MeNB or basic information (e.g., cell ID, S-MAC) for maintaining the anchoring with the MeNB, information for establishing the RRC connection For example, SIB2 information).

12 is a block diagram showing a configuration of a terminal according to an embodiment of the present invention.

Referring to FIG. 12, the terminal 1200 includes a controller 1210 and a communication unit 1220.

The communication unit 1220 receives paging information for informing that the system information block of the MeNB has changed from the SeNB and signaling specified for the terminal to inform the changed part in the system information block of the MeNB.

The control unit 1230 changes the information setting of the system information block for the MeNB in the next SIB modification period from the time of receiving the paging information and the signaling.

Also, when the terminal is in the RRC connected state with the SeNB and not in the RRC connected state with the MeNB, the communication unit 1220 can receive information on the system information block of the MeNB from the SeNB. The information on the system information block of MeNB may be information on the entire system information block of MeNB or basic information (e.g., cell ID, S-MAC) for maintaining anchoring with MeNB, information for establishing RRC connection For example, SIB2 information).

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (16)

In a system including a master base station capable of communicating with a terminal through a secondary base station and the secondary base station,
When a change occurs in a system information block (SIB) of the master base station, transmitting an indication to the secondary base station that the SIB of the master base station has changed and information about a changed part of the SIB of the master base station And transmitting the system information to the master base station. And a master base station capable of communicating with the terminal through the secondary base station and the secondary base station, the system information transmitting method executed by the secondary base station,
Receiving an indication from the master base station indicating that a system information block (SIB) of the master base station has changed and information about a changed part in the SIB of the master base station;
Configuring paging information to inform that the SIB of the master base station has changed and signaling specified by the terminal to inform the changed part of the SIB of the master base station; And
And transmitting the paging information and the signaling to the MS. 3. The method of claim 2,
Further comprising the step of transmitting information on the SIB of the master base station to the terminal when the terminal is connected to the terminal in an RRC (Radio Resource Control) connected state. The method of claim 3,
Wherein information on the SIB of the master base station is periodically transmitted from the master base station to the secondary base station or transmitted from the master base station to the secondary base station when a request is made from the secondary base station. Delivery method. The method of claim 3,
Wherein the information on the SIB of the master base station includes at least one of SIB information, cell ID, and S-MAC information, or SIB 2 information. In a system including a master base station capable of communicating with a terminal through a secondary base station and the secondary base station,
Receiving paging information for informing that the system information block (SIB) of the master base station has changed from the secondary base station and signaling specified for the terminal to inform the changed part of the SIB of the master base station; And
And changing the SIB information setting for the master base station in the next SIB modification period after receiving the paging information and the signaling. The method according to claim 6,
Further comprising the step of receiving information on the SIB of the master base station from the secondary base station when the terminal becomes RRC (Radio Resource Control) connected with the secondary base station. 8. The method of claim 7,
Wherein the information on the SIB of the master base station includes at least one of SIB information, cell ID, and S-MAC information, or SIB 2 information. In a system including a master base station capable of communicating with a terminal through a secondary base station and the secondary base station,
When a change occurs in a system information block (SIB) of the master base station, an indicator informing that the SIB of the master base station has been changed to the secondary base station, and an indicator indicating a change in the SIB of the master base station, And a base station communication unit. 1. A system including a master base station capable of communicating with a terminal via a secondary base station and the secondary base station,
A master base station communication unit for receiving from the master base station an indicator indicating that a system information block (SIB) of the master base station has changed and information about a changed part in the SIB of the master base station;
A controller configured to configure paging information for informing that the SIB of the master base station has changed and signaling for the terminal to inform the changed part of the SIB of the master base station; And
And a terminal communication unit for transmitting the paging information and the signaling to the terminal. 11. The method of claim 10,
Wherein the terminal communication unit transmits information on the SIB of the master base station to the terminal when the terminal is in a RRC (Radio Resource Control) connected state with the terminal. 12. The method of claim 11,
Wherein information on the SIB of the master base station is periodically transmitted from the master base station to the secondary base station or from the master base station to the secondary base station when a request is made from the secondary base station. 12. The method of claim 11,
Wherein the information on the SIB of the master base station includes at least one of SIB information, cell ID, and S-MAC information, or SIB 2 information. A terminal communicating with a system including a master base station capable of communicating with a terminal through a secondary base station and the secondary base station,
A communication unit for receiving paging information for informing that the system information block (SIB) of the master base station has changed from the secondary base station and signaling specified for the terminal to inform the changed part of the SIB of the master base station; And
And a controller for changing the SIB information setting for the master base station in a next SIB modification period after receiving the paging information and the signaling. 15. The method of claim 14,
Wherein the communication unit receives information on the SIB of the master base station from the secondary base station when the terminal becomes an RRC (Radio Resource Control) connected state with the secondary base station. 16. The method of claim 15,
Wherein the information on the SIB of the master base station includes at least one of SIB information, cell ID, and S-MAC information, or SIB 2 information.

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