KR20140080387A - Method for Controlling Communication in Carrier Aggregation and Apparatus therefor - Google Patents

Abstract

The present invention relates to a method for controlling communication in carrier aggregation and an apparatus therefor. A method for controlling communication in carrier aggregation according to one embodiment of the present invention includes a step of transmitting UE capability information to a base station; a step of transmitting a power imbalance indication message to the base station; and a step of solving power imbalance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control method,

The present invention relates to a communication control method and apparatus in a CA environment. More particularly, the present invention relates to a communication control method and apparatus for solving a power imbalance situation in a CA environment.

According to the trend of standardization of 3GPP LTE-Advanced, various discussions about carriers are proceeding. One of them is a new type of carrier (NCT).

NCT refers to a carrier type in which the overhead is reduced by removing the control area to increase the payload size compared to the conventional carrier type (LCT). With this design, it is possible to obtain an increase in the payload size, a reduction in the interference intensity to the adjacent cell, and energy saving of the corresponding cell.

Carrier aggregation (CA) (hereinafter referred to as CA) is a frequency utilization technique that allows a total of 100 MHz of distributed or adjacent bands to be utilized by using up to 20 bands up to a total of 5 bands.

There is a Standalone NCT (S-NCT) that operates the NCT independently of the conventional carrier type (LCT) as the type of NCT.

In contrast to this, NCT type can not use NCT carrier in PCell (Primary serving cell), but uses only LCT carrier in Pcell and non-standalone NCT (NCT carrier) in Scell (Secondary serving cell) NCT) type. In the non-standalone type, the terminal obtains the RRC setting information for the NCT carrier through the LCT carrier.

The present invention is intended to provide a communication control method and apparatus in a CA environment. Specifically, the present invention provides a method and apparatus for controlling communication in a CA environment through the help information of a terminal and the problem of a base station to effectively solve a power imbalance situation occurring in a CA environment.

According to an exemplary embodiment of the present invention, a method of controlling a communication of a terminal includes: a first serving cell of a LCT (Legacy Carrier Type) carrier and a second serving cell of a NCT (Carrier Type) carrier in a CA (Carrier Aggregation) Transmitting a UE Capability Information message for solving a power imbalance problem caused by the UE to the base station; Performing a measurement on the Pcell and the Scell upon receiving information indicating that the power imbalance problem is solved from the base station, and transmitting a power imbalance indication message to the base station according to a measurement result; And resolving the power imbalance in accordance with the resolution when receiving a solution for resolving the power imbalance problem from the base station.

According to another example of the present invention, a UE is a power due to a primary serving cell of a legacy carrier type (LCT) carrier and a secondary serving cell of a NCT (Carrier Type) carrier in a CA (Carrier Aggregation) Transmits a UE Capability Information message for solving a power imbalance problem to the base station and performs a measurement on the Pcell and the Scell when receiving information indicating that the power imbalance problem is solved from the base station A transmission / reception unit for transmitting a power imbalance indication message to the base station according to a measurement result; And a controller for canceling the power imbalance in accordance with the resolution when receiving a solution for solving the power imbalance problem from the base station.

A communication control method of a base station according to an exemplary embodiment of the present invention includes a primary serving cell of a LCT (Legacy Carrier Type) carrier and a secondary serving cell of a NCT (Carrier Type) carrier in a CA (Carrier Aggregation) A Radio Resource Control (RRC) reconfiguration message for informing whether or not to support the power imbalance problem is received when receiving a UE Capability Information message for solving the power imbalance problem due to the power imbalance problem ; And receiving a power imbalance indication message according to a result of performing measurements on the Pcell and the Scell from the UE, determining a solution to resolve the power imbalance and transmitting the solution to the UE ; ≪ / RTI >

A base station according to another exemplary embodiment of the present invention is a power due to a primary serving cell of a LCT (Legacy Carrier Type) carrier and a secondary serving cell of a NCT (Carrier Type) carrier in a Carrier Aggregation (CA) environment Receiving a UE Capability Information message for solving a power imbalance problem from the UE, and transmitting and receiving an RRC connection reconfiguration (RRC) reconfiguration message indicating whether the power imbalance problem is resolved part; And a power imbalance indication message according to a result of performing a measurement on the Pcell and the Scell through the transceiver from the terminal, determines a solution to resolve the power imbalance, And transmitting the data to the terminal through the terminal.

According to the present invention, it is possible to efficiently cope with a power imbalance situation between a secondary component carrier (SCC) and a primary component carrier (PCC) in a CA environment.

In addition, when a power imbalance situation occurs, the power imbalance situation can be quickly and efficiently solved under the control of the terminal, and when the power imbalance situation is changed, the terminal can quickly recover the limitation condition for solving the power imbalance problem, Resources can be utilized more efficiently.

1 is a diagram illustrating a communication system to which embodiments of the present invention are applied.
FIG. 2 is a diagram for explaining a power imbalance situation. FIG.
3 is a diagram for explaining a communication control method according to an embodiment of the present invention.
4 and 5 are views for explaining a signaling method of a communication control method according to an embodiment of the present invention.
6 to 8 are diagrams for explaining a power imbalance problem solution method of a communication control method according to an embodiment of the present invention.
9 is a diagram for explaining a communication control method according to another embodiment of the present invention.
10 is a view for explaining a terminal that performs embodiments of the present invention.
11 is a view for explaining a base station that performs embodiments 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 symbols as possible even if 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.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

1 is a diagram illustrating a wireless communication system to which embodiments of the present invention are applied. Wireless communication systems are widely deployed to provide various communication services such as voice, packet data, and the like.

1, a communication system includes a base station (BS) 20 or 30 (Base Station, BS or eNB) that performs uplink and downlink communications with a user equipment (UE) 10 and a terminal 10.

The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS Base transceiver system, an access point, a relay node, and the like.

That is, the base station or the cell in this specification is interpreted as a comprehensive meaning indicating a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as a megacell, a macrocell, a microcell, a picocell, a femtocell, and a relay node communication range.

Herein, the user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word Do not.

Although one terminal 10 and two base stations 20 and 30 are shown in Fig. 1, the present invention is not limited thereto. It is possible that one terminal 10 can communicate with two or more base stations 20 and 30 and that a plurality of terminals 10 communicate with two or more base stations 20 and 30 It is possible.

There is no limitation on a multiple access technique applied to a communication system, and the present invention is applicable to a CDMA (Code Division Multiple Access), a TDMA (Time Division Multiple Access), an FDMA (Frequency Division Multiple Access), an OFDMA (Orthogonal Frequency Division Multiple Access) -FDMA, OFDM-TDMA, and OFDM-CDMA.

In addition, the present invention can be applied to a TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, a Frequency Division Duplex (FDD) scheme in which different frequencies are used, It is applicable to the hybrid duplexing method.

Specifically, the embodiment of the present invention is applied to asynchronous wireless communication that evolves into LTE (Long Term Evolution) and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA- . It should be understood that the present invention is not limited to or limited to a particular wireless communication field and should be construed as including all technical fields to which the spirit of the present invention may be applied.

The base station 20 can perform uplink and downlink transmission using a LCT carrier having a control region as a primary serving cell (PCell).

For this, the BS 20 and the UE 10 perform control such as Physical Downlink Control Channel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), Physical Uplink Control CHannel Transmits and receives control information through a channel, and transmits / receives data through a data channel such as a Physical Downlink Shared CHannel (PDSCH) or a Physical Uplink Shared CHannel (PUSCH).

Also, the base station 30 can perform uplink and downlink transmission using an NCT carrier that does not partially include a control region as a scell.

Although two separate base stations 20 and 30 operate here as Pcell 40 and Scell 50, respectively, the present invention is not limited thereto. For example, when one base station includes a Pcell and a Scell It is also possible to operate as a plurality of cells. That is, it can be assumed that there is a connection between base stations 20 and 30 that can be regarded as one base station. For example, the base station 30 may be a remote radio head (RRH) connected to the base station 20 through an optical fiber.

Meanwhile, the terminal 10 can receive the NCT carrier and the LCT carrier from the two base stations 20 and 30, respectively. In this case, when the power of the NCT carrier of the Scell becomes larger than a certain level of the LCT carrier of the PCell, the signal quality of the Pcell is lowered in the process of receiving the signal at the terminal 10, have.

Fig. 2 is a view for explaining a situation where a power imbalance problem occurs. Fig.

If the power of the SCC is larger than the PCC by a certain amount, the signal is not sufficiently removed in the process of down conversion of the received signal and image rejection or image frequency rejection The problem of reception at the PCC is referred to as a power imbalance problem.

However, when the power imbalance problem occurs as shown in FIG. 2, since the NS-NCT is set to Scell and the NS-NCT can not be a Pcell, a handover to the NS-NCT having a strong power can not occur . Therefore, the problem of power imbalance that occurs due to the increased power of the scell compared to the Pcell can not be solved, and the communication quality of the terminal 10 may be affected due to the reception problem in the Pcell.

3 is a diagram for explaining a communication control method according to an embodiment of the present invention.

Referring to FIG. 3, the UE 10 may transmit a UE Capability Information message to the BS 20 to trigger a power imbalance problem (S310).

That is, the terminal 10 may determine whether it can support the NCT carrier, whether there is a possibility of a power imbalance problem, whether it is capable of resolving the power imbalance problem when a power imbalance problem occurs, At least one of capability information or terminal capability information on whether or not the capability to transmit a power unbalance notification message for notifying and notifying a problem is transmitted to a terminal capable of initiating a power imbalance problem resolution procedure as shown in Fig. It can be included in the information message and transmitted to the base station.

The capability information or the terminal capability information can be displayed in the UE Capability Information message using, for example, one bit, for example, a bit indicating that the NCT carrier can be supported, a power imbalance problem A bit indicating the likelihood of occurrence of a power imbalance problem, or a bit indicating a capability of solving a power imbalance problem, or a bit indicating that there is a power imbalance alert message transmission capability, Capability information or terminal capability information.

On the other hand, the capability information or the terminal capability information can be indicated for each band combination. Referring to FIG. 4, capability information or terminal capability information can be displayed for each band combination supported by the terminal, for example.

The combination of bands means a combination of bands in which the terminal 10 can perform CA. If the band list supported in the existing signal is 1, 2, or 3 as shown in the figure, {1}, {2,2}, {1,3}, {1,2,3}.

{1} denotes an intra-band contiguous band combination in Band 1, {2, 2} denotes an intra-band non-contiguous band combination in Band 2, combination. {1, 3} denotes the inter-band band combination between Band 1 and 3, {1,2,3} denotes the inter-band combination between Band 1, ).

Therefore, in the above example, {2} (intra-band contiguous band combination in Band 2) or {1,2} (Band 1, 2 The inter-band band combination) or the like, or the terminal capability information.

In the above example, the terminal 10, as an example of the capability information or the terminal capability information, indicates a bit indicating the possibility of a power imbalance problem, for example, {1, possible}, {2 , 2}, {1,3, possible}, {1,2,3, possible}.

That is, it is possible to notify the base station 20 through the terminal capability information message that the power imbalance problem may occur in the band combinations {1}, {1, 3}, {1, 2, 3}.

Alternatively, in the above example, the terminal 10 may indicate bits capable of solving the power imbalance problem as examples of capability information or terminal capability information for each band supported by the terminal 10, for example, {1}, {2 , 2, supported}, {1,3}, {1,2,3}. That is, the terminal 10 can inform the base station 20 of the ability to support the power imbalance problem for the {2, 2} band combination through the terminal capability information message described above.

Meanwhile, the UE 10 can include the information only once in the UE capability information message without distinguishing between FDD (Frequency Division Duplex) / TDD (Time Division Duplex). Alternatively, the terminal 10 may divide the FDD and the TDD into a UE capability message and signal the UE 10 with each of the information.

Also, the terminal 10 may signal the information as separate information regardless of whether or not the NCT is supported, or may signal the terminal 10 only to receive the NCT carrier.

The base station 20 receiving the terminal capability information message notifies the base station 20 of information on support of the power imbalance problem and transmits a radio resource control (RRC) connection for performing a power imbalance indication configuration process And transmits a Connection Reconfiguration message (S320).

That is, for the power imbalance indication configuration, the base station 20 may transmit information indicating that it supports the power imbalance notification process to the terminal 10 by including it in the RRC connection reset message. The terminal 10 can transmit a power unbalance notification message to be described later if the power imbalance notification process is supported by the base station 10.

The base station 20 may indicate the power imbalance notification process support or permission information with, for example, one bit information. The bit will be a bit in the sense that the power imbalance notification process is supported or allowed.

As another example, the base station 20 may refer to carrier frequencies at which power imbalance notification triggering can be performed as power imbalance notification procedure support information. That is, the terminal 10 performs power imbalance notification triggering only on the carrier frequency set through the corresponding signaling.

As one example, the frequencies may be composed of a list of E-UTRA Absolute Radio Frequency Channel Number (EARFCN) and may be transmitted from the base station 20 to the terminal 10. [ The EARFCN value is a value assigned to a center frequency (also referred to as a carrier frequency) used in E-UTRA. Each value between 0 and 65535, EARFCN value can have different value if the value of the band in which the frequency is operated is different even if the specified center frequency value is the same. As another example, a cell list may be additionally signaled for each frequency, with or without a list of EARFCNs. The cell list may be a list of Physical Cell IDs or a list of Evolved Cell Global Identity (ECGI) values. Here, the ECGI refers to an ID for distinguishing a base station and a cell from each other globally, and may include a public land mobile network (PLMN) and / or a base station ID (eNB ID), which are network IDs.

Upon receiving the RRC connection re-establishment message, the terminal 10 performs a measurement in the Pcell and the Scell in order to identify the power imbalance problem (S330).

The terminal 10 may perform all of the carrier frequency ranges set in the measurement configuration including the Pcell and the Scell. This will be the case where only one bit is acquired in the above example, meaning that the power imbalance notification process is supported or allowed through the RRC connection re-establishment message.

Alternatively, when the terminal 10 acquires the power unbalance notification process support information corresponding to the cell list corresponding to the specific carrier frequency domain or the carrier frequency domain from the above-described RRC connection re-establishment message, Can perform the measurement selectively.

The terminal 10 may have a problem or incur a problem in performing the video removal based on the information indicating that the power imbalance problem may occur, that is, the measurement result of the Pcell and the Scell A power imbalance indication message may be transmitted to the base station to notify the occurrence of a power imbalance problem (S340).

In order to confirm whether a power imbalance problem has occurred, the terminal 10 can confirm whether or not the power of the scell exceeds a predetermined threshold value in comparison with the Pcell, for example. The threshold value may be set to a predetermined value, for example, through various experiments on the occurrence of a power imbalance problem.

The terminal 10 may store information for informing occurrence of a power imbalance problem (i.e., power imbalance occurrence information), for example, a serving cell ID list, a physical cell ID, a frequency list, A band combination list, and a measurement object ID list, in the power imbalance notification message.

The serving cell ID is set to the terminal 10 by the base station 20 and is defined as a number ranging from 0 to 7 for each cell regardless of the frequency. The serving cell ID value may be represented by CIF (Carrier Indication Field) within the PDCCH. CIF is a 3-bit information that can express values from 0 to 7.

Accordingly, the terminal 10 can display the power imbalance occurrence information corresponding to the serving cell ID. This type of information may be an 8-bit or 7-bit type bitmap as shown in FIG. 5 (the index may not exist in the case of a Pcell corresponding to the bit 0 position). In FIG. 5, for example, information may be displayed in such a manner that bit positions corresponding to the serving cell IDs in which a power imbalance problem may occur are displayed.

In another example, the terminal 10 can display the power imbalance occurrence information using the cell ID list. Here, the cell ID means a physical cell ID. For example, a cell in which power imbalance has occurred for each cell can be displayed corresponding to the cell ID list. The physical cell ID is a value corresponding to 0 to 503 and may be referred to by a combination of PSS and SSS values.

As another example, the terminal 10 may indicate information for informing occurrence of a power imbalance problem corresponding to a frequency list where power imbalance occurs. The frequency list may be, for example, a list of E-UTRA Absolute Radio Frequency Channel Number (EARFCN) values.

As another example, the terminal 10 may display power imbalance occurrence information for informing occurrence of a power imbalance problem corresponding to the band combination list. For example, in each of the band combinations {1}, {2, 2}, {1, 2, 3} in the band combination list described above, a power imbalance problem Can be displayed.

As another example, the terminal 10 may transmit information for notifying the occurrence of a power imbalance problem in the form of a list of Measurement Object IDs (Measurement Object IDs). The measurement object ID is a value corresponding to 1 to 32, and is an ID value for a measurement object used to designate a frequency or cell in which a measurement is performed at the time of setting a measurement. 4, when the center frequencies of the carrier to be measured are f1, f2, f3 and f4, and their measurement object IDs are 4, 5, 2 and 1, respectively, When an imbalance problem occurs, information indicating the occurrence of the power imbalance problem can be displayed corresponding to the measurement object ID 2 of the corresponding f3. That is, the measurement object ID of f4 in Fig. 4 is displayed and notified to the base station.

The base station 20 receiving the power imbalance notification message determines an appropriate solution (S350). For this, the base station 20 can select an appropriate solution based on the measurement report result and the NCT cell information received by the base station 20 through the network.

6 to 8 are diagrams for explaining respectively examples of solutions that the base station 20 can select.

6, if the terminal 10 receives a service from the NCT cell where a power imbalance problem has occurred, the base station 20 releases the corresponding cell, that is, It is possible to delete the connection from the configuration information to disconnect the cell.

7, when the terminal 10 receives a service from the NCT cell in which a power imbalance problem has occurred, the base station 20 maintains the RRC configuration information of the corresponding cell, To deactivate the receiving operation of the corresponding cell.

8, when the terminal 10 receives a service from the NCT cell in which a power imbalance problem has occurred, the base station 20 may power-down the power of the corresponding cell . To this end, the base station 20 that transmits the LCT carrier, which is currently the Pcell, is the power in the NCT cell in which the problem occurs through the X2 interface or the S2 interface or the eNB internal interface (when the same base station 20 transmits a NCT that is a Scell) Information on which terminal is generating the balance problem can be informed to the base station 30 that transmits the NCT carrier of Scell. At this time, the power imbalance generation indicator can be indicated as 1-bit information, for example, to indicate the terminal where the power imbalance problem has occurred. As the information for indicating the UE, for example, a C-RNTI (Control-Radio Network Temporary) which is a unique identifier for indicating a UE in one cell can be used.

Accordingly, the base station 30 of the NCT cell, which has received the power imbalance occurrence information, may reduce its transmission power as a whole or reduce only the transmission power for the terminal in which the power imbalance problem occurs.

When the transmission power of the NCT cell is reduced, the UEs belonging to the NCT cell can be updated through RRC signaling or system information (for example, SIB message) for transmission power reduction.

9 is a diagram for explaining a communication control method according to another embodiment of the present invention.

Referring to FIG. 9, when a power imbalance problem occurs, the terminal 10 transmits a power imbalance notification message according to an embodiment of the present invention described with reference to FIG. 3 to the base station 20 (S910).

Thereafter, the terminal 10 may experience a change in the power imbalance problem depending on the measurement result in the Pcell and the measurement result in the scell (S920).

For example, information about the occurrence of a power imbalance problem may change, or a power imbalance problem may no longer occur. That is, the serving cell ID list, the cell ID list, the frequency list, the band combination list, the measurement target ID list, and the like, which are reported as having generated the power imbalance problem, may be changed in step S910. In addition, the power imbalance problem may no longer occur in a serving cell ID list, a cell ID list, a frequency list, a band combination list, a measurement target ID list, etc., which are reported to have a power imbalance problem.

Accordingly, the terminal 10 transmits a new power imbalance indication message to the base station (S930). That is, the terminal 10 can display information indicating the occurrence of the current power imbalance problem corresponding to the serving cell ID list, the cell ID list, the frequency list, the band combination list, the measurement target ID list, If there is no balance problem at all, the information indicating that a power imbalance problem has occurred can be set to zero, or an empty power imbalance notification message in which this information itself does not exist can be transmitted. That is, an information component (not shown) indicating that a power imbalance problem has occurred, such as a serving cell ID list, a cell ID list, a frequency list, a band combination list, IE, Information Element) is emptied can be transmitted.

The base station 10 may again determine an appropriate new solution to recover the solution previously presented according to the power imbalance notification message S910 (S940) and transmit the newly determined solution to the terminal 10 accordingly (S950 ). For example, if a Scell has been released, the cell may be added back to the RRC configuration information, the reception operation may be resumed when the reception operation for the Scell is deactivated, When the power of the corresponding cell is boosted down, it can be boosted up again.

10 is a diagram showing a configuration of a user terminal 10 or 1000 that performs embodiments of the present invention.

10, the user terminal 1100 includes a measurement performing unit 1010, a control unit 1020, and a transmitting and receiving unit 1030.

The performance performing unit 1010 performs the measurement according to the above-described embodiments of the present invention.

In addition, the controller 1020 controls the overall operation of the terminal to perform the embodiments of the present invention described above.

The transceiver 1330 transmits and receives messages including a terminal capability information message, an RRC connection reset message, and a power imbalance notification message according to the embodiments of the present invention to the base stations 20 and 1100.

The terminal 10 or 1000 described with reference to FIG. 10 transmits and receives messages according to the embodiments of the present invention through the measurement performing unit 1010, the control unit 1020 and the transmitting and receiving unit 1030 and performs a measurement It detects the power imbalance problem, solves the power imbalance problem from the base station, and solves the power imbalance problem by performing the solution.

11 is a diagram illustrating a configuration of a base station that performs embodiments of the present invention.

11, the base station 20 or 1100 according to another embodiment includes a network communication unit 1110, a control unit 1120, and a transmission / reception unit 1130.

The controller 1120 controls the overall operation of the base station to perform the operations required to perform the above-described embodiments of the present invention.

The network communication unit 1010 communicates with the network via the X2 interface or the S2 interface.

The transmission / reception unit 1130 transmits / receives a message, such as a terminal capability information message, an RRC connection reset message, a power unbalance notification message, and the like necessary for performing the above-described embodiments of the present invention to /

The base station 20 or 1100 described with reference to FIG. 11 transmits and receives a message according to the above-described embodiments of the present invention through the control unit 1120 and the transmission and reception unit 1130 to determine a solution to the power imbalance problem, (10 or 1000) to eliminate the power imbalance problem.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Or two or more steps may be integrated, or one step may be performed in two or more separate steps.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. The codes and code segments constituting the computer program may be easily deduced by those skilled in the art.

Such a computer program can be stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing an embodiment of the present invention. As a storage medium of the computer program, a magnetic recording medium, an optical recording medium, or the like can be included.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

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 falling within the scope of the same shall be construed as falling within the scope of the present invention.

Communication unit: 1110 Control unit: 1120 Transmission unit: 1130

Claims (20)

A terminal for solving the problem of power imbalance due to the primary serving cell of the LCT (Legacy Carrier Type) carrier and the secondary serving cell of the NCT (Carrier Type) carrier in a CA (Carrier Aggregation) Transmitting a UE Capability Information message to a base station;
Performing a measurement on the Pcell and the Scell upon receiving information indicating that the power imbalance problem is solved from the base station, and transmitting a power imbalance indication message to the base station according to a measurement result; And
And resolving the power imbalance in accordance with the resolution when receiving a solution for solving the power imbalance problem from the base station.
The method according to claim 1,
The power imbalance notification message includes at least one of a serving cell ID list, a physical cell ID list, a frequency list, a band combination list, and a measurement object ID list And the power imbalance occurrence information is displayed correspondingly.
The method according to claim 1,
The solution to the problem of eliminating the power imbalance problem may include a method of releasing a scell where the power imbalance occurs, a method of stopping a receiving operation on the scell where the power imbalance occurs, And a method of boosting down the terminal.
The method according to claim 1,
The UE Capability Information message includes at least one of information indicating whether or not the NCT carrier is supported, whether a power imbalance is generated, whether a power imbalance problem solving capability exists, and whether or not a power imbalance notification message can be transmitted And transmitting the communication control information to the terminal.
The method according to claim 1,
Transmitting a new power imbalance indication message to the base station in response to the changed measurement result when a change occurs in the measurement result; And
Receiving a new solution to resolve the new power imbalance from the base station, and resolving the new power imbalance according to the solution. A terminal for solving the problem of power imbalance due to the primary serving cell of the LCT (Legacy Carrier Type) carrier and the secondary serving cell of the NCT (Carrier Type) carrier in a CA (Carrier Aggregation) And transmits a capability information (UE Capability Information) message to the base station. When receiving information indicating that the power imbalance problem is solved from the base station, the base station performs a measurement on the Pcell and the Scell, a transmission / reception unit for transmitting a power imbalance indication message to the base station; And
And a controller for receiving the solution to the power imbalance problem from the base station and resolving the power imbalance according to the solution.
The method according to claim 6,
The transmission / reception unit may include at least one of a serving cell ID list, a physical cell ID (physical cell ID) list, a frequency list, a band combination list, and a measurement object ID list And displays the power imbalance occurrence information in response to one piece of information.
The method according to claim 6,
The control unit may be configured to solve the power imbalance problem by releasing a scell where the power imbalance occurs, to suspend a reception operation for a scell where the power imbalance occurs, And a method of boosting down the power of the generated scell.
The method according to claim 6,
In the UE Capability Information message, the transmission / reception unit determines whether or not the NCT carrier is supported, whether a power imbalance is generated, whether a power imbalance problem solving capability exists, and whether a power imbalance notification message can be transmitted And displays one piece of information.
The method according to claim 6,
The transmission / reception unit transmits a new power imbalance indication message to the base station in accordance with the changed measurement result when a change occurs in the measurement result,
Wherein the controller, when receiving a new solution for resolving the new power imbalance from the base station, resolves the new power imbalance in accordance with the solution.
A terminal for solving the problem of power imbalance due to the primary serving cell of the LCT (Legacy Carrier Type) carrier and the secondary serving cell of the NCT (Carrier Type) carrier in a CA (Carrier Aggregation) Receiving a UE Capability Information message from a terminal, the method comprising: transmitting an RRC connection reconfiguration message informing whether the power imbalance problem is solved; And
Receiving a power imbalance indication message according to a result of performing a measurement on the Pcell and the Scell from the MS, determining a solution for resolving the power imbalance and transmitting the solution to the MS; Wherein the base station is a mobile station.
12. The method of claim 11,
Wherein the RRC connection reestablishment message indicates whether or not to support the power imbalance problem in response to a physical cell ID (physical cell ID) list or a frequency list.
12. The method of claim 11,
The power imbalance solution includes a method of releasing a scell where the power imbalance occurs, a method of stopping a receiving operation on a scell where the power imbalance occurs, and a method of boosting down the power of the scell in which the power imbalance occurs Wherein the at least one base station comprises at least one base station.
12. The method of claim 11,
The UE Capability Information message includes at least one of information indicating whether or not the NCT carrier is supported, whether a power imbalance is generated, whether a power imbalance problem solving capability exists, and whether a power imbalance notification message can be transmitted Wherein the base station is a mobile station.
12. The method of claim 11,
When a new power imbalance indication message is received from the terminal according to the changed measurement result and the measurement result is changed, a new solution for resolving the new power imbalance is determined, To the base station, and transmitting the base station communication control message to the base station.
A terminal for solving the problem of power imbalance due to the primary serving cell of the LCT (Legacy Carrier Type) carrier and the secondary serving cell of the NCT (Carrier Type) carrier in a CA (Carrier Aggregation) A transmission / reception unit for transmitting a Radio Resource Control (RRC) reconnection message informing whether or not to support the power imbalance problem when the UE capability information message is received from the UE; And
Receiving a power imbalance indication message according to a result of performing a measurement on the Pcell and the Scell through the transceiver from the MS, determines a solution to resolve the power imbalance, To the mobile station through the base station.
17. The method of claim 16,
Wherein the transmission / reception unit indicates whether the power imbalance problem is supported in response to a physical cell ID (physical cell ID) list or a frequency list in the RRC connection re-establishment message.
17. The method of claim 16,
Wherein the control unit is configured to perform a method of releasing a scell where the power imbalance is generated, a method of stopping a receiving operation on a scell where the power imbalance occurs, and a power of a scell in which the power imbalance occurs, Down of the mobile station.
17. The method of claim 16,
In the UE Capability Information message, the transmission / reception unit determines whether or not the NCT carrier is supported, whether a power imbalance is generated, whether a power imbalance problem solving capability exists, and whether a power imbalance notification message can be transmitted And one information is displayed and transmitted.
17. The method of claim 16,
When the transmission / reception unit receives a new power imbalance indication message from the terminal according to the changed measurement result due to a change in the measurement result,
Wherein the controller determines a new solution to resolve the new power imbalance and transmits the new solution to the terminal through the transceiver.

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