KR20130085884A - Apparatus and method for transmitting power information of component carrier in multiple component carrier system - Google Patents

Abstract

PURPOSE: An apparatus and method for transmitting the power information of a component carrier are provided to form a MAC component about the power information. CONSTITUTION: An overlap section between an n-th frame of a subframe S1 and an (n+1)-th frame of a subframe S2 is checked. The subframe S1 is determined by an arbitrary serving cell 1. The subframe S2 is determined by a serving cell 2. An overlap section between the n-th frame of the subframe S1 and an (n-1)-th frame of the subframe S2 is checked. A power control value for the transmission power of a terminal is determined in consideration of the overlap subframe section. [Reference numerals] (1202,1212,1222) Subframe 1; (1204,1214,1224) Subframe 2; (1206,1216,1226) Subframe 3; (1235) Different subframe parallel transmission section; (1250) First part; (1255) Second part; (1260) Third part

Description

Apparatus and method for transmitting power information of component carriers in a multi-component carrier system {APPARATUS AND METHOD FOR TRANSMITTING POWER INFORMATION OF COMPONENT CARRIER IN MULTIPLE COMPONENT CARRIER SYSTEM}

The present invention relates to wireless communication, and more particularly, to an apparatus and method for transmitting power information of a component carrier in a multi-component carrier system.

Wireless communication systems generally use bandwidth for data transmission. Recent 3GPP LTE systems are discussing expanding bandwidth to support increasing transmission capacity.

In connection with this, a multiple component carrier system that supports data in a wideband through a plurality of carriers has emerged. Meanwhile, in a wireless communication system, a scheduling scheme for minimizing interference and ensuring battery consumption of a terminal for efficient resource allocation includes transmit power control (TPC), modulation and coding scheme (Modulation and Coding Scheme); MCS) and bandwidth can be adjusted.

Therefore, there is a need for a more efficient transmission power control scheme of a terminal for supporting a plurality of CCs.

An object of the present invention is to provide an apparatus and method for transmitting and receiving power information of a terminal for a plurality of component carriers in a multi-component carrier system.

Another technical problem of the present invention is to provide an apparatus and method for configuring power information of a terminal for a plurality of component carriers in a multi-component carrier system.

Another technical problem of the present invention is to provide an apparatus and method for configuring a MAC control element for power information in a multi-element carrier system.

Another technical problem of the present invention is to provide an apparatus and method for analyzing a MAC control element for power information in a multi-element carrier system.

Another technical problem of the present invention is to provide an apparatus and method for calculating a transmission power of a terminal in consideration of subframes determined corresponding to a component carrier in a multi-component carrier system.

Another technical problem of the present invention is to provide an apparatus and method for configuring a transmission power of a terminal when supporting different subframes for each serving cell according to M-TA in a multi-component carrier system.

Another technical problem of the present invention is an apparatus and method for calculating a transmission power of a terminal in an overlapping subframe period when synchronization of subframes corresponding to each serving cell is different according to M-TA in a multi-component carrier system. In providing.

According to an aspect of the present invention, a method of transmitting power information by a terminal in a multi-element carrier system includes an nth frame of a subframe S1 determined by an arbitrary serving cell Cell1 and a subframe S2 determined by the serving cell Cell2. The interval in which the n + 1 th frame overlaps is checked, or the n th frame of the subframe S1 determined by the arbitrary serving cell Cell1 and the n-1 th frame of the subframe S2 determined by the serving cell Cell2 overlap. And determining a power control value (P _{cmax , c} ) for the transmission power of the terminal in consideration of the overlapping subframe period.

According to the present invention, P _cmax may be configured when different subframes are transmitted at the same time.

According to the present invention, the maximum transmission power report on the primary serving cell in the MAC control element is not duplicated by using the type indication field in a wireless system using carrier aggregation, thereby reducing the waste of uplink resources. Can be obtained.

In addition, according to the present invention, a P _cmax value transmitted for efficient uplink power control in a wireless system using carrier aggregation may be configured without resource waste on a MAC control element. Since there is no resource waste in the MAC control element, it is possible to increase the reliability of the MAC message and to reduce the waste of uplink resources used for control.

1 shows a wireless communication system.
2 shows a connection configuration between a downlink component carrier and an uplink component carrier in a multi-carrier system.
3 is a graph representing surplus power in the time-frequency axis according to the present invention.
4 is a conceptual diagram illustrating an effect of uplink scheduling of a base station on transmission power of a terminal in a wireless communication system.
5 is an explanatory diagram illustrating a power adjustment amount and a maximum transmission power in a multi-element carrier system according to an embodiment of the present invention.
6 is a block diagram illustrating a structure of a MAC PDU for power reporting according to another embodiment of the present invention.
7 is an explanatory diagram illustrating an example of a method of selecting a power report cell group.
8 is an explanatory diagram illustrating another example of a method of selecting a power report cell group.
9 is a diagram illustrating a P _{cmax , c} structure according to the present invention.
10 is a block diagram showing a terminal for transmitting power information and a base station for receiving power information according to an embodiment of the present invention.
11 is a diagram illustrating the transmission of subframes in different TAGs having different TA values according to the present invention.
12 is a diagram showing a method for determining the maximum transmit power value P _{cmax , c} according to the present invention.
FIG. 13 is a diagram illustrating the application of different maximum power reductions in the first to third parts according to the present invention.
14 is a flowchart illustrating a method of transmitting power information according to an embodiment of the present invention.

Hereinafter, some embodiments will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In the following description of the embodiments 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 disclosure rather unclear.

The present invention discloses a method for controlling uplink transmission power of a terminal supporting a plurality of component carriers in a wireless communication system, and in particular, a method for controlling a maximum transmission power of a terminal supporting a plurality of component carriers. Initiate. In this regard, the terminal of the present invention operates by a power lower than the maximum transmission power of the transmission power of the allowable range, and also discloses a method for sharing information on the uplink transmission power between the terminal and the base station. In particular, in the present invention, the terminal supports a plurality of component carriers, characterized in that to calculate the transmission power in consideration of the subframes determined by each component carrier for the configured cell.

In other words, in the multi-component carrier system supporting M-TA (multiple-timing advance), when the subframe synchronization is different for each serving cell, a method of calculating the transmission power of the terminal in the overlapping subframe period It starts.

In addition, the present invention will be described with respect to a wireless communication network. The work performed in the wireless communication network may be performed in a process of controlling a network and transmitting data by a system (e.g., a base station) Work can be done at a terminal connected to the network.

1 shows a wireless communication system.

Referring to FIG. 1, a wireless communication system 10 is widely deployed to provide various communication services such as voice, packet data, and the like.

The wireless communication system 10 includes at least one base station 11 (BS). Each base station 11 provides a communication service for a specific geographic area (generally called a cell) 15a, 15b, 15c. The cell may again be divided into multiple regions (referred to as sectors).

A mobile station (MS) 12 may be fixed or mobile and may be a user equipment (UE), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, (personal digital assistant), a wireless modem, a handheld device, and the like.

The base station 11 generally refers to a fixed station that communicates with the terminal 12 and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point have. The cell should be interpreted in a generic sense to indicate a partial area covered by the base station 11 and is meant to cover various coverage areas such as a megacell, a macro cell, a microcell, a picocell, and a femtocell.

Hereinafter, downlink refers to communication from the base station 11 to the terminal 12, and uplink refers to communication from the terminal 12 to the base station 11. In the downlink, the transmitter may be part of the base station 11, and the receiver may be part of the terminal 12.

In the uplink, the transmitter may be part of the terminal 12, and the receiver may be part of the base station 11.

There are no restrictions on multiple access schemes applied to wireless communication systems. (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA , OFDM-CDMA, and the like. A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

The layers of the radio interface protocol between the terminal and the network are classified into L1 (first layer), L2 (first layer), and L2 (third layer) based on the lower three layers of the Open System Interconnection (Second layer), and L3 (third layer).

The physical layer, which is the first layer, is connected to the upper medium access control (MAC) layer through a transport channel, and data between the MAC and the physical layer moves through the transport channel. . In addition, data is moved between different physical layers, that is, between physical layers of a transmitting side and a receiving side through a physical channel. There are several physical control channels used in the physical layer. A physical downlink control channel (PDCCH) for transmitting physical control information is a HARQ (hybrid automatic repeat) associated with a resource allocation of a paging channel (PCH) and a downlink shared channel (DL-SCH) and DL-SCH to a UE. request) Provides information. The PDCCH may carry an uplink grant informing the UE of the resource allocation of the uplink transmission. A physical control format indicator channel (PCFICH) informs the UE of the number of OFDM symbols used for PDCCHs and is transmitted every subframe. PHICH (physical Hybrid ARQ Indicator Channel) carries a HARQ ACK / NAK signal in response to uplink transmission. A physical uplink control channel (PUCCH) carries uplink control information such as HARQ ACK / NAK, scheduling request and CQI for downlink transmission. A physical uplink shared channel (PUSCH) carries an uplink shared channel (UL-SCH).

The situation in which the UE transmits a PUCCH or a PUSCH is as follows.

The terminal configures a PUCCH for at least one or more of information on channel quality information (CQI), or information on a precoding matrix index (PMI) or rank indicator (RI) selected based on measured spatial channel information. Send periodically. In addition, the terminal should transmit information on ACK / NACK (Acknowledgement / non-Acknowledgement) for the downlink data received from the base station to the base station after a predetermined number of subframes after receiving the downlink data. For example, when downlink data is received in the nth subframe, the PUCCH configured with ACK / NACK information for the downlink data is transmitted in the n + 4 subframe. If all of the ACK / NACK information cannot be transmitted on the PUCCH allocated from the base station, or if the PUCCH capable of transmitting ACK / NACK is not allocated from the base station, the ACK / NACK information may be carried on the PUSCH.

The second layer, the wireless data link layer, is composed of a MAC layer, an RLC layer, and a PDCP layer. The MAC layer is a layer responsible for mapping between a logical channel and a transport channel. The MAC layer selects an appropriate transport channel to transmit data transmitted from the RLC layer, and transmits necessary control information to a header of a MAC PDU (Protocol Data Unit) . The RLC layer is located on top of the MAC to support reliable transmission of data. In addition, the RLC layer segments and concatenates RLC SDUs (Service Data Units) transmitted from an upper layer in order to construct data of an appropriate size suitable for a radio section. The RLC layer of the receiver supports data reassembling to recover the original RLC SDU from the received RLC PDUs. The PDCP layer is used only in the packet switched area, and may compress and transmit the header of the IP packet to increase the transmission efficiency of packet data in the wireless channel.

The third layer, the RRC layer, controls the lower layer and exchanges radio resource control information between the UE and the network. Various RRC states such as idle mode and RRC connection mode (Connected Mode) are defined according to the communication state of the UE, and transition between RRC states is possible if necessary. The RRC layer defines various procedures related to radio resource management such as system information broadcasting, RRC connection management procedure, multi-carrier configuration procedure, radio bearer control procedure, security procedure, measurement procedure, and mobility management procedure (handover) do.

Carrier aggregation (CA) supports a plurality of carriers, also referred to as spectrum aggregation or bandwidth aggregation. Individual unit carriers bound by carrier aggregation are called component carriers (CC). Each CC is defined by a bandwidth and a center frequency. Carrier aggregation is introduced to support increased throughput, prevent cost increases due to the introduction of wideband radio frequency (RF) devices, and ensure compatibility with existing systems. For example, if five CCs are allocated as granularity in a carrier unit having a 5 MHz bandwidth, a bandwidth of up to 20 MHz may be supported.

CCs may be divided into primary CCs (hereinafter referred to as PCCs) and secondary CCs (hereinafter referred to as SCCs) according to activation. The PCC is a carrier that is always active, and the SCC is a carrier that is activated / deactivated according to certain conditions. Activation means that the transmission or reception of traffic data is performed or is in a ready state. Deactivation means that transmission or reception of traffic data is impossible and measurement or transmission / reception of minimum information is possible. A terminal may use only one PCC or one or more SCCs with a PCC. The terminal may be assigned a PCC and / or SCC from the base station.

Hereinafter, a multi-carrier system refers to a system that supports carrier aggregation. In a multi-carrier system, adjacent carrier aggregation and / or non-adjacent carrier aggregation may be used, and either symmetric aggregation or asymmetric aggregation may be used.

2 illustrates linkage between a downlink component carrier and an uplink component carrier in a multi-carrier system.

Referring to FIG. 2, in downlink, downlink component carriers (hereinafter, referred to as DL CCs) D1, D2, and D3 are aggregated, and in uplink, uplink component carriers (hereinafter, referred to as UL CCs) U1, U2, and U3 are represented. Are concentrated. Where Di is the index of the DL CC and Ui is the index of the UL CC (i = 1, 2, 3). At least one DL CC is PCC and the rest is SCC. Likewise, at least one UL CC is PCC and the rest is SCC. For example, D1, U1 is PCC, and D2, U2, D3, U3 are SCC.

In the FDD system, DL CC and UL CC are set to 1: 1, and D1 is set to U1, D2 is set to U2, and D3 is set to 1: 1 respectively. The UE establishes a connection between the DL CCs and the UL CCs through system information transmitted through a logical channel BCCH or a UE-specific RRC message transmitted by a DCCH. Each connection setting may be cell specific or UE specific.

2 illustrates only a 1: 1 connection setup between a DL CC and an UL CC, but a connection setup of 1: n or n: 1 may also be established. The index of the element carrier does not match the order of the element carriers or the position of the frequency band of the corresponding element carrier.

Hereinafter, a description will be given of the power headroom (PH).

The surplus power means extra power that can be used in addition to the power currently used by the UE for uplink transmission. For example, suppose a terminal having a maximum transmission power of 10W, which is an allowable transmission power. And suppose that the current terminal uses a power of 9W in the frequency band of 10Mhz. Since the terminal can additionally use 1W, surplus power becomes 1W.

Here, if the base station allocates a frequency band of 20Mhz to the terminal, power of 9W * 2 = 18W is required. However, since the maximum power of the terminal is 10W, if 20Mhz is allocated to the terminal, the terminal may not use all of the frequency band, or the base station may not properly receive the signal of the terminal because of insufficient power. In order to solve this problem, the terminal reports that the surplus power is 1W to the base station, so that the base station can schedule within the surplus power range. This report is called a Power Headroom Report (PHR).

Since surplus power changes from time to time, a periodic surplus power reporting method may be used. According to the periodic surplus power reporting method, when the periodic timer expires, the terminal triggers the surplus power report, and when the surplus power is reported, the terminal restarts the periodic timer.

In addition, the surplus power report may be triggered when the Path Loss (PL) estimate measured by the UE changes to a predetermined reference value or more. The path loss estimate is measured by the terminal based on a reference symbol received power (RSRP).

The surplus power P _PH is defined as a difference between the maximum transmit power P _cmax configured in the terminal and the estimated power P _{estimated for} uplink transmission as expressed by Equation 1, and is expressed in dB.

Surplus power P _PH may also be referred to as power headroom PH, remaining power, or surplus power. That is, the remaining value excluding the P _estimated which is the sum of the transmit powers used in each CC from the maximum transmit power of the terminal set by the base station becomes the P _PH value.

As an example, P _estimated is equal to an estimated power P _{PUSCH for} transmission of a Physical Uplink Shared CHannel (PUSCH). Therefore, in this case, P _PH can be obtained by Equation 2. Equation 2 is a case where only the PUSCH is transmitted in the uplink, and this is called Type 1. Surplus power according to type 1 is referred to as type 1 surplus power.

As another example, P _estimated is equal to the sum of the power P _PUSCH estimated for the transmission of the _PUSCH and the power P _PUCCH estimated for the transmission of the Physical Uplink Control Channel (PUCCH). Therefore, in this case, the surplus power can be obtained by the equation (3). Equation 2 is a case where a PUSCH and a PUCCH are simultaneously transmitted in uplink, and this is called type 2. Surplus power according to type 2 is referred to as type 2 surplus power.

3 is a graph representing surplus power according to Equation 3 on a time-frequency axis. This shows the surplus power for one CC.

Referring to FIG. 3, the set maximum transmission power P _cmax of the terminal is composed of P _PH 305, P _PUSCH 310, and P _PUCCH 315. In other words, this is the exception of the P _PUSCH (310) and P _PUCCH (315) in the P _cmax power is defined as P _PH (305). Each power is calculated in units of a transmission time interval (TTI).

The primary serving cell is the only serving cell having a UL PCC capable of transmitting PUCCH. Therefore, since the PUCCH cannot be transmitted in the secondary serving cell, surplus power is determined as in Equation 2, and a parameter and an operation for the method for reporting surplus power determined by Equation 3 are not defined.

On the other hand, in the main serving cell, the operation and parameters for the method of reporting surplus power determined by Equation 3 may be defined. If the terminal receives the uplink grant from the base station to transmit the PUSCH in the main serving cell and simultaneously transmits the PUCCH in the same subframe according to a predetermined rule, the terminal at the time when the surplus power report is triggered And all surplus power according to Equation 3 are transmitted to the base station.

4 is a conceptual diagram illustrating an effect of uplink scheduling of a base station on transmission power of a terminal in a wireless communication system.

Referring to FIG. 4, the terminal receives an uplink grant through the PDCCH that allows uplink data transmission from the base station at time (or subframe) t0. Therefore, the terminal should calculate the amount of transmission power according to the uplink grant at t0.

First, at time t0, the UE is weighted to the PUSCH power offset value 400 and the TPC 405 value received from the base station and the path loss between the base station and the UE. The primary transmit power 425 is calculated in consideration of the value a (received from the base station). The first transmission power (1st Tx Power) 425 is mainly based on a parameter that is influenced by the path environment between the base station and the terminal and a parameter that is determined by the policy of the network. In addition, the UE considers the QPSK modulation included in the uplink grant and the scheduling parameter 415 indicating allocation of 10 resource blocks (RBs). Calculate The secondary transmission power 430 is a transmission power that is changed through uplink scheduling of the base station.

Accordingly, the terminal may calculate the final uplink transmission power by adding the primary transmission power 425 and the secondary transmission power 430 together. Here, the final uplink transmission power may not exceed the configured maximum UE transmit power (P _cmax ) of the configured UE. In the example of FIG. 4, since the final transmission power is smaller than the value of P _cmax at time t0, uplink information transmission according to a set parameter is possible. In addition, there is a surplus power (power headroom) 420, which is a margin for additionally set transmission power. The surplus power 420 is transmitted by the terminal to the base station according to a rule determined by the wireless communication system.

At time t1, the base station changes to the scheduling parameter 450 indicating the 16QAM modulation scheme and the allocation of the 50 resource blocks in consideration of the transmission power that can be additionally set to the terminal through the information of the surplus power 420. The terminal resets the secondary transmit power 465 according to the scheduling parameter 450. The primary transmit power 460 at t1 is a PUSCH power offset (435) value and a transmit power control (TPC, 440) value and a value that is weighted to the PL 445 between the base station and the terminal (received from the base station). Is determined in consideration of, and is assumed to be equal to the primary transmit power 425 at t0.

At time t1, P _cmax changes to a value close to P _{cmax _L} , whereas the sum of the secondary transmit power 465 and the primary transmit power 460 required by the scheduling parameter 450 exceeds P _cmax . . That is, P _{cmax _H} -P there occurs a surplus power estimation error 455 as the _cmax. As described above, when the scheduling for the uplink resource is performed based only on the surplus power information, the terminal cannot set uplink transmission power expected by the base station, and thus performance degradation occurs. When using the component carrier aggregation scheme, the surplus power estimate error 455 becomes larger.

Whether a single component carrier system or a multi-component carrier system, the maximum transmission power set in the terminal is affected by the power adjustment of the terminal. Power adjustment means to reduce the maximum transmission power set in the terminal within a certain allowable range, it may be referred to as Maximum Power Reduction (MPR). The amount of power reduced by the power adjustment is referred to as the power adjustment amount. The reason for reducing the maximum transmission power set in the terminal is as follows. There is a case where the maximum transmission power has to be limited by the type of signal to be transmitted currently based on the hardware configuration in the terminal (particularly, RF (Radio Frequency)).

The maximum transmission power in consideration of power adjustment is expressed by the following equation.

Here, P _cmax is the maximum transmission power set for the UE, P _{cmax -L} is the minimum value, P _cmax-H of P _cmax is the maximum value of P _cmax. More specifically, P _{cmax -L} and P _{cmax -H} are each calculated by the following equation.

Here, MIN [a, b] is the smaller of a and b, P _Emax is the maximum power determined by the RRC signaling of the base station, and ΔT _C is applied when there is uplink transmission at the edge of the band. The amount of power to be made, which is 1.5 dB or 0 dB depending on the bandwidth. P _powerclass is a power value according to several power classes defined to support various terminal specifications in the system. In general, the LTE system supports the power class 3, P _powerclass by the power class 3 is 23dBm. PC is the amount of power adjustment, and APC (Additional Power Coordination) is an additional amount of power signaled by the base station.

The power regulation may be set to a specific range or to a certain constant. The power adjustment may be defined in terminal units, may be defined in each CC unit, or may be set to a predetermined range or constant in each CC unit. In addition, the power adjustment may be set to a range or a constant depending on whether the PUSCH resource allocation of each CC is continuous or discontinuous. The power adjustment may be set to a range or a constant according to the presence or absence of the PUCCH.

5 is an explanatory diagram illustrating a power adjustment amount and a maximum transmission power in a multi-element carrier system according to an embodiment of the present invention. For convenience of explanation, it is assumed that only one UL CC is allocated to the terminal.

Referring to FIG. 5, assuming that ΔT _C = 0, the maximum value P _cmax−H of the maximum transmit power P _cmax may be 23 dB corresponding to the power class 3. The minimum value P _cmax-L of the maximum transmit power P _cmax is obtained by subtracting the power adjustment amount PC 500 and the additional power adjustment amount APC 505 from the maximum value P _cmax-H . That is, the terminal reduces the minimum value P _cmax-L of the maximum transmission power P _cmax by using the power adjustment amount PC 500 and the additional power adjustment amount APC 505. The maximum transmit power P _cmax is determined between the maximum value P _cmax-H and the minimum value P _cmax-L .

Meanwhile, the uplink transmission power 530 is represented by the sum of the bandwidth (BW), the power 515 determined by the MCS and the RB, the path loss (PL, 520), and the PUSCH transmission power control (PUSCH TPCs) 525. . Surplus power (PH, 510) is the maximum transmission power (P _max ) minus the uplink transmission power (530).

In FIG. 5, only one UL CC is described. However, when a plurality of UL CCs are allocated, the maximum transmit power will be given in units of terminals rather than in units of UL CCs. It can be given as the sum of the maximum transmit powers.

In calculating the maximum transmit power, P _Emax , ΔT _C , P _powerclass , and additional power adjustment amount (APC) are information known or known by the base station. However, since the power adjustment amount PC may be variable, the maximum transmission power of the terminal also varies accordingly. When the terminal reports the surplus power to the base station, the base station can only estimate the extent of the maximum transmission power through the surplus power. Since the base station performs an uncertain uplink scheduling within the estimated maximum transmit power, the base station may schedule the modulation / channel bandwidth / RB requiring a transmit power of the maximum transmit power or more for the terminal. This problem may occur more prominently in a multi-component carrier system. Therefore, the terminal needs to inform the base station of the amount or range of the maximum transmission power for each CC. Hereinafter, the maximum transmit power for each CC is referred to as a carrier maximum transmit power (P _{cmax , c} ).

Meanwhile, scheduling cases of various CCs may exist in a multi-component carrier environment. For each case, the transmission of P _{cmax and c} information is required.

However _, if the amount of P _{cmax , c} information is too large, it may be a problem under limited uplink resources. It may occur that P _{cmax , c} is the same for several CCs.

As an example, P _{cmax and c} may be the same among a plurality of CCs according to a scheduling configuration. Since the P _{cmax and c} information is a value related to the characteristics of the radio frequency (RF), it is highly likely to have the same value for each CC for the same scheduling configuration. Herein, the scheduling setting refers to a setting including a CC configuration, a RB (Resource Block) configuration, a Modulation and Coding Scheme (MCS) configuration, and the like scheduled to the UE.

Hereinafter, first, a definition and expression method of the maximum carrier power of the carrier will be described. The structure of the MAC control element according to the second method will be described in detail.

1. Definition and Expression Method of Carrier Maximum Transmitting Power (P _{cmax .c} )

Carrier maximum transmit power (P _{cmax .c} ) is expressed in dB as the maximum transmit power that can be output per one UL CC. Carrier maximum transmit power may be given to the threshold value as 20dB≤P _{cmax .c} <22dB, it may be given as a constant, such as P _{cmax .c} = 20dB. The maximum transmission power of the carrier may be expressed by quantizing a predetermined size in dB units, for example, in 1 dB units. That is, P _cmax.c may be expressed as 1 dB, 2 dB, 3 dB, or the like. The maximum carrier power may be set differently for each UL CC or may be set to the same value. For example, UL CC1 is set to P _cmax.c1 , and UL CC2 and UL CC3 are both P _{cmax .} can be set to _c2 .

The maximum carrier power is divided into at least one level having a predetermined range. Between each step there is a dB difference of constant or variable magnitude. The terminal and the base station operate a range mapping table in which an index is assigned to each step. By using the range mapping table, it is effective because the size of the maximum transmit power of a carrier can be expressed by only an index. The size of the range mapping table is determined according to the amount of information (for example, the number of bits) used for reporting the carrier maximum transmission power. The report on the range of the maximum transmission power of the carrier and the report of the maximum transmission power of the carrier are used in the same sense, and hereinafter, the report of the maximum transmission power of the carrier will be referred to for the unification of the term.

The number of bits representing the maximum carrier power depends on what the system defines. More bits may allow for a wider or more granular range of power reporting. However, if the UE consumes a lot of uplink resources to report the maximum carrier power to the base station, it may cause a significant degradation of system performance. Therefore, there is a need for a method of minimizing the amount of information required for reporting the maximum transmit power of the carrier. Hereinafter, a method of expressing a carrier maximum transmission power in 3 bits and 5 bits will be described. However, this is merely an example and the number of bits does not limit the present invention.

Table 1 is a range mapping table according to an embodiment of the present invention. This is a case where 3 bits are used for reporting the maximum transmission power of the carrier.

Index P _{cmax .c} (dB) Range Report 0 P _{cmax .c} ≥22 (or 22≤P _{cmax .c} ≤23) One 20≤P _{cmax .c} <22 2 18≤P _{cmax .c} <20 3 16≤P _{cmax .c} <18 4 14≤P _{cmax .c} <16 5 12≤P _{cmax .c} <14 6 10≤P _{cmax .c} <12 7 P _{cmax .c} <10

Referring to Table 1, the range of carrier maximum transmit power is divided into eight levels. The index is 3 bits and indicates the range of the maximum carrier power of the eight steps. For example, index 3 indicates that the range of the carrier maximum transmit power 16≤P _{cmax .c} <18. As such, one index is mapped to a range of one carrier maximum transmit power. After determining the range to which the maximum carrier power belongs, the terminal may report the maximum carrier power as an index mapped to the determined range. For example, assuming that UL CC1 and UL CC2 are configured in the terminal, the terminal may report index 2 to the base station for UL CC1 and index 5 to the base station for UL CC2. Each step in the range of carrier maximum transmit power differs by a certain amount, that is, by 2 dB intervals.

The range of the maximum transmission power in the carrier range of the mapping table may vary according to the power class (P _powerclass) of the terminal. The power class of the terminal is the maximum output power for any transmission bandwidth within the channel bandwidth. As an example, a total of four power classes of the terminal defined in the LTE system, among which the maximum transmission power is defined in the power class 3 is 23dB. The power class is measured at least one subframe period, and the range of maximum power reduction (MPR) is set depending on the power class.

Table 2 is a range mapping table according to another example of the present invention. This is a case where 4 bits are used to report the maximum transmission power of the carrier, and there is a 1 dB difference between steps in the maximum transmission power range of the carrier.

Index P _{cmax .c} (dB) Range Report 0 P _{cmax .c} ≥22 (or 22≤P _{cmax .c} ≤23) One 21≤P _{cmax .c} <22 2 20≤P _{cmax .c} <21 3 19≤P _{cmax .c} <20 4 18≤P _{cmax .c} <19 5 17≤P _{cmax .c} <18 6 16≤P _{cmax .c} <17 7 15≤P _{cmax .c} <16 8 14≤P _{cmax .c} <15 9 13≤P _{cmax .c} <14 10 12≤P _{cmax .c} <13 11 11≤P _{cmax .c} <12 12 10≤P _{cmax .c} <11 13 9≤P _{cmax .c} <10 14 8≤P _{cmax .c} <9 15 P _{cmax .c} <8

Referring to Table 3, the maximum carrier power range is divided into 16 levels. The index is 4 bits and indicates the range of the maximum carrier power in step 16 above. For example, index 3 indicates that the range of the carrier maximum transmit power 19≤P _{cmax .c} <20.

The table can also be constructed by setting the dB difference at each step of the lower index based on the power class. This is shown in Table 3.

Index P _{cmax .c} (dB) Range Report 0 P _powerclass One P _powerclass -1≤P _{cmax .c} <P _powerclass 2 _{P powerclass -2≤P cmax .c <P powerclass} -1 3 _{P powerclass -3≤P cmax .c <P powerclass} -2 4 _{P powerclass -4≤P cmax .c <P powerclass} -3 5 _{P powerclass -5≤P cmax .c <P powerclass} -4 6 _{P powerclass -6≤P cmax .c <P powerclass} -5 7 _{P powerclass -7≤P cmax .c <P powerclass} -6 8 _{P powerclass -8≤P cmax .c <P powerclass} -7 9 _{P powerclass -9≤P cmax .c <P powerclass} -8 10 _{P powerclass -10≤P cmax .c <P powerclass} -9 11 _{P powerclass -11≤P cmax .c <P powerclass} -10 12 _{P powerclass -12≤P cmax .c <P powerclass} -11 13 _{P powerclass -13≤P cmax .c <P powerclass} -12 14 _{P powerclass -14≤P cmax .c <P powerclass} -13 15 _{P powerclass -15≤P cmax .c <P powerclass} -14

Referring to Table 3, there is a 1dB difference between each step in all indexes.

Table 4 is a range mapping table according to another example of the present invention. This is a case where 5 bits are used for reporting the maximum transmission power of the carrier, and there is a constant 1 dB difference between steps in the range of the maximum transmission power of the carrier.

Index P _{cmax .c} (dB) Range Report 0 P _{cmax .c} ≥22 (or 22≤P _{cmax .c} ≤23) One 21≤P _{cmax .c} <22 2 20≤P _{cmax .c} <21 3 19≤P _{cmax .c} <20 4 18≤P _{cmax .c} <19 5 17≤P _{cmax .c} <18 6 16≤P _{cmax .c} <17 7 15≤P _{cmax .c} <16 8 14≤P _{cmax .c} <15 9 13≤P _{cmax .c} <14 10 12≤P _{cmax .c} <13 11 11≤P _{cmax .c} <12 12 10≤P _{cmax .c} <11 13 9≤P _{cmax .c} <10 14 8≤P _{cmax .c} <9 15 7≤P _{cmax .c} <8 16 6≤P _{cmax .c} <7 17 5≤P _{cmax .c} <6 18 4≤P _{cmax .c} <5 19 3≤P _{cmax .c} <4 20 2≤P _{cmax .c} <3 21 1≤P _{cmax .c} <2 22 0≤P _{cmax .c} <1 23 Reserved 24 Reserved 25 Reserved 26 Reserved 27 Reserved 28 Reserved 29 Reserved 30 Reserved 31 Reserved

Referring to Table 4, the maximum carrier power range is divided into a total of 32 levels. The index is 5 bits, which indicates the range of the maximum carrier power in 32 steps. For example, the index 19 indicates that the range of the carrier maximum transmit power 3≤P _{cmax .c} <4. Since the maximum transmit power should be greater than zero, there is no range of the maximum transmit power mapped to the remaining indexes 23 to 31. Therefore, indexes 23 to 31 remain as reserved code points.

 Tables 1 to 4 show differences of 1 dB between steps. Of course, the range mapping table may be configured to have an ndB difference between steps, or the range mapping table may be configured to have a variable size difference for each step.

2. Structure of Information for Power Reporting

6 is a block diagram illustrating a structure of a MAC PDU for power reporting according to another embodiment of the present invention.

Referring to FIG. 6, the MAC PDU 600 includes a MAC header 610, a MAC control element 620 for power reporting, a MAC SDU 630, and a padding 640.

The MAC header 610 includes at least one MAC subheader. The MAC subheader and MAC control element 620 for power reporting is configured in octets. An octet refers to 8 bits of information. For example, the MAC subheader is composed of an R field 611, an E field 612, an LCID field 613, an F field 614, and an L field 615.

The L field 615 indicates the length of the MAC control element 620 for the corresponding power report in bytes. The MAC control element 620 for power reporting includes at least one octet, and each octet includes any one of surplus power information and carrier maximum transmit power. Accordingly, the MAC control element 620 for power reporting may include both surplus power information and carrier maximum transmit power, or may include only one of them.

As another example, the MAC header includes at least one subheader, and each subheader corresponds to one MAC SDU or one MAC control element or padding. The order of the subheaders is arranged in the same order as the corresponding MAC SDU, MAC control element or padding in the MAC PDU.

Each subheader may include four fields, such as R, R, E, LCID, or six fields, such as R, R, E, LCID, F, and L. A subheader containing four fields is a subheader corresponding to a MAC control element or padding, and a subheader containing six fields is a subheader corresponding to a MAC SDU.

The logical channel identification information (LCID) field is an identification field for identifying a logical channel corresponding to a MAC SDU or for identifying a type of a MAC control element or padding and may be 5 bits.

For example, the LCID field indicates whether the corresponding MAC control element is a surplus power MAC control element for transmission of surplus power, a feedback request MAC control element for requesting feedback information from the terminal, and discontinuous reception. DRX (Discontinuous Reception) command for the command Identifies whether it is a MAC control element or a Contention Resolution Identity (MAC) control element for contention resolution between terminals.

In addition, according to the present invention, the LCID field may identify whether the corresponding MAC control element is a MAC control element for power reporting. There is one LCID field for each MAC SDU, MAC control element or padding. Table 5 is an example of an LCID field.

Index LCID values 00000 CCCH 00001-01010 Identity of the logical channel 01011-10111 Reserved 11000 Scell activation / deactivation 11001 Reference CC Indicator 11010 Power Report (CA) 11011 C-RNTI 11100 Truncated BSR 11101 Short bsr 11110 Long bsr 11111 Padding

Referring to Table 5, the LCID field value of 11010 may indicate that the corresponding MAC control element is a MAC control element for power reporting of at least one component carrier according to the present invention. The MAC control element for power reporting includes at least one of power headroom information and carrier maximum transmit power information P _{cmax and c} information. The surplus power information is information including at least one surplus power field (PHF) and an additional field related thereto. The carrier maximum transmit power information is information including at least one carrier maximum transmit power field and additional fields related thereto. Here, a field is at least one bit representing meaningful information. For example, the surplus power field is a field indicating surplus power, and the carrier maximum transmit power field is a field indicating carrier maximum transmit power. The number of bits in these fields is determined by the system.

3. Power report cell group and same power cell group

(1) Power Report Cell Group (PRCG)

In order to report the power of the CC, the terminal and the base station must first discuss about which CC the power is reported. The UE reports the first carrier maximum transmit power for CC1 because the base station cannot determine whether the first carrier maximum transmit power is for CC1 or CC2. Therefore, the CC to be reported should be specified, and the set of CCs to be reported is called a Power Report Cell Group (PRCG). Therefore, the carrier maximum transmit power is reported only for CCs belonging to the power report cell group, and the carrier maximum transmit power is not reported for CCs that are not.

In more detail, there may be a first mode in which the UE dynamically informs the base station as bitmap information and a second mode in which the UE belongs to the power report cell group in advance. In the case of the first mode, bitmap information may be included in the MAC control element. In this case, the bitmap information may be disposed at the front end of the MAC control element, may be included in the MAC control element for surplus power reporting, or may be included in the MAC control element for maximum transmission power reporting.

Regarding the criteria for selecting a power report cell group, there may be various cases.

As an example, all cells configured in the terminal are selected as the power report cell group.

7 is an explanatory diagram illustrating an example of a method of selecting a power report cell group.

Referring to FIG. 7, three CCs CC1, CC2, and CC3 are set in the terminal. RF1 includes CC1 and CC2, and RF2 includes CC3.

As another example, only activated cells are selected as the power reporting cell group.

8 is an explanatory diagram illustrating another example of a method of selecting a power report cell group.

Referring to FIG. 8, when three CCs CC1, CC2, and CC3 are configured in a terminal, only CC1 and CC2 are activated, and CC3 is in a deactivated state. In this case, the deactivation state means a state in which data and control information transmission is not performed until the activation command falls through the corresponding CC. In the situation of FIG. 8, the number of CCs available for transmission is three, but the CCs used for actual transmission are CC1 and CC2.

As another example, only scheduled cells are selected as the power report cell group.

9 is a diagram illustrating a P _{cmax , c} structure according to the present invention. Extended Power Headroom MAC Control Element.

Referring to FIG. 9, C _i denotes a cell index bitmap, and when this bit is 1, surplus power values and P _{cmax and c} values for the corresponding cell are configured in the corresponding MAC CE. R means reserved bits. V is a bit indicating whether the corresponding PH value and the value of P _{cmax , c are the} values calculated by the actual transmission. If this bit is 1, the corresponding PH value and the value of P _{cmax , c} are the actual transmission of the cell at the time of transmission. However, the PH value and the P _{cmax and c} values virtually calculated by the predetermined rule are configured in the MAC CE. PH (Power Headroom) is a field containing surplus power values. In P _, when a change occurs in a value of P _{cmax and c due} to power management, a corresponding bit for a corresponding cell is set to 1. P _{cmax , c} means P _{cmax , c} value in each cell.

10 is a block diagram showing a terminal for transmitting power information and a base station for receiving power information according to an embodiment of the present invention.

Referring to FIG. 10, the terminal 1000 includes a power calculator 1005, a power information generator 1010, and an uplink information transmitter 1015.

The power calculator 1005 calculates surplus power or maximum carrier power for the CC. The power calculation unit 1005 calculates the maximum transmit power that can be output for the CCs, respectively, and calculates the maximum transmit power for each part by dividing the parts for a period in which different subframes are transmitted in a timing alignment group (TAG). do. That is, when a part of transmitting different subframes in parallel for each TAG occurs at a certain time as different TAGs have different TA values, one or more parts of transmitting different subframes in parallel are generated. Separate the above parts and calculate P _{cmax, c} values for each part.

The power information generation unit 1010 expresses the maximum carrier power for each CC based on Tables 1 to 5 above. In this case, the maximum transmit power transmitted by the terminal included in the power information may be determined as one of P _{cmax and c} values calculated for each part. For example, it may be a minimum value of P _{cmax , c} calculated for each part. As another example, a P _cmax calculated for each _part, the first part _c of the P _cmax, can be determined by the value _c.

The UE will perform uplink power control based on the P _{cmax and c} values determined through the above process. In the present invention, the predetermined P _{cmax , c} value is _referred to as power control P _{cmax , c} . P _{cmax, c} as a value used to perform the power control P _{cmax, c} value and the power information transmitted from the terminal to separate the base station may be different. Herein, it is _{referred to as} information transmission P _{cmax , c} .

An exemplary example of the power control of the present invention P _{cmax, c} is determined as a minimum value among the P _{cmax, c} calculation of each part, transfer information P _{cmax, c} is the P _{cmax, c} the first part (that is, the sync frame interval) Can be determined by a value.

The power information may be higher layer signaling such as a MAC message or an RRC message or may be physical layer signaling. The power information may refer to a MAC control element for power reporting. Alternatively, the power information may specifically refer to a MAC control element for reporting the maximum transmission power of the carrier. Alternatively, the power information may refer to both the MAC control element for surplus power reporting and the MAC control element for maximum carrier power reporting. Alternatively, the power information may mean a carrier maximum transmission power field.

The uplink information transmitter 1015 transmits power information to the base station 1050.

The base station 1050 includes an uplink information receiver 1055, a power information analyzer 1060, a power acquirer 1065, and a scheduling unit 1070.

The uplink information receiver 1055 receives power information from the terminal 1000.

The power information analyzer 1060 analyzes power information.

The power acquisition unit 1065 extracts a carrier maximum transmit power field based on the result analyzed by the power information analyzer 1060, and calculates a carrier maximum transmit power value for each CC therefrom.

The scheduling unit 1070 performs uplink scheduling based on a carrier maximum transmit power value for each CC and generates an uplink grant.

11 is a diagram illustrating the transmission of subframes in different TAGs having different TA values according to the present invention.

Referring to FIG. 11, pTAG 1100, sTAG ₁ 1110, and sTAG ₂ 1120 have different TA values based on a reference time 1130 for TA. The pTAG 1100 applies a TA1 1105 to transmit a subframe, the sTAG ₁ 1110 applies a TA2 1115 to transmit a subframe, and the sTAG ₂ 1120 applies a TA3 1125 Send a subframe.

In this case, since different TA values are applied in different serving cells, there is an interval 1135 in which different subframes are simultaneously transmitted in parallel. That is, while the subframe 3 1106 is transmitted in the pTAG 1100, the subframe ₂ 1114 and 1124 exist in the sTAG ₁ 1110 and the sTAG ₂ 1120. In addition, while the subframes 3 (1106 and 1116) are transmitted in the pTAG 1100 and the sTAG ₁ 1110, the subframe 2 (1124) is transmitted in the sTAG ₂ 1120.

12 is a diagram showing a method for determining the maximum transmit power value P _{cmax , c} according to the present invention. As in FIG. 11, the pTAG 1200, the sTAG ₁ 1210, and the sTAG ₂ 1220 have different TA values based on a reference time 1230 for the TA. The pTAG 1200 applies a TA1 1205 to transmit a subframe, the sTAG ₁ 1210 applies a TA2 1215 to transmit a subframe, and the sTAG ₂ 1220 applies a TA3 1225 to Send a subframe.

Referring to FIG. 12, a period in which a subframe 21224 is transmitted in sTAG ₂ 1220 that transmits a subframe by applying TA3 1225 may include a first part 1250, a second part 1255, and the like. It may be divided into a third part 1260.

The first part 1250 is a period in which the subframes 2120, 1214, and 1224 are transmitted in all of the pTAG 1200, the sTAG ₁ 1210, and the sTAG ₂ 1220.

In the second part 1255, the subframe 3 1206 is transmitted in the pTAG 1200, but the subframe ₂ 1214 and 1224 are transmitted in the sTAG ₁ 1210 and the sTAG ₂ 1220.

The third part 1260 is a period in which the subframes 3 1206 and 1216 are transmitted in the pTAG 1200 and the sTAG ₁ 1210, but the subframe 2 1224 is transmitted in the sTAG ₂ 1220.

Like the first part, a section in which all subframes having the same value are transmitted is referred to as a sync frame section in the corresponding subframe. On the other hand, a section in which transmission of a subframe having a different value except for the first part occurs is referred to as an asynchronous frame section in the corresponding subframe.

According to the present invention, in calculating the P _{cmax , c} value of the terminal _, the n-th frame of the subframe S1 determined by any serving cell Cell ₁ and n + 1 of the subframe S2 determined by the serving cell Cell ₂ It is calculated considering the section where the second frame overlaps. Alternatively, the calculation is performed considering an interval where an nth frame of subframe S1 determined by an arbitrary serving cell Cell ₁ overlaps with an n-1th frame of subframe S2 determined by serving cell Cell ₂ .

For example, in FIG. 12, based on the subframe 21224 of the sTAG ₂ 1220, the subframe 3 1206 of the pTAG 1200, which is another serving cell group, and the sTAG ₁ 1210 of FIG. 12. It overlaps with the subframe 21214 and the subframe 31216. Accordingly, the terminal supporting the pTAG 1200, the sTAG ₁ 1210, and the sTAG ₂ 1220 determines a value of P _{cmax , c} to be transmitted in consideration of the overlapping subframe periods.

That is, since the P _{cmax , c} values calculated for the first parts 1250 to 1260 may be different from each other, the terminal determines the P _{cmax , c} value to be transmitted. After calculating P _{cmax and c} values in the first part 1250 to 1260, respectively, the most appropriate P _{cmax and c} values are transmitted to the base station through power information. Accordingly, the present invention can solve the problem of inferior accuracy by calculating P _{cmax and c} values based on the same subframe in a carrier aggregation situation.

P _{cmax and c} values are calculated using the following equations (7) to (10).

Here, P _{cmax, c} is a minimum value, P _{cmax _H, c} of the serving and the maximum transmit power set in the terminal for the cell c, P _{cmax _L, c} is P _{cmax, c} is the maximum value of P _cmax.

More specifically, P _{cmax _L, c} is calculated as in Equation 8 in the contiguous carrier aggregation of the intra-band, and non-contiguous of the inter-band. In carrier aggregation, the following equation is calculated. On the other hand, P _{cmax _H} is calculated by the following equation (10).

Where MIN [a, b] is the smaller of a and b, P _{EMAX , c} is the maximum power determined by the RRC signaling of the base station for the serving cell c, and ΔT _{C , c} is for the serving cell c The amount of power applied when there is uplink transmission at the edge of the band, and has 1.5 dB or 0 dB depending on the bandwidth. P _PowerClass is a power value according to several power classes defined to support various terminal specifications in the system. In general, LTE system supports power class 3, P _powerClass by power class 3 is 23dBm. ΔT _{IB , c} is an additional tolerance for the serving cell c, as shown in Table 6 below.

Inter-band CA Configuration E-UTRA Band ΔT _{IB , c} [dB] CA_1A-5A One 0.3 5 0.3

At near carrier aggregation in the same frequency band, MPR _c is equal to MPR and A-MPR _c is equal to A-MPR.

P-MPR _c refers to power management for the serving cell c. The power management term for the terminal in different frequency band carrier aggregation is one P-MPR, and P-MPR _c is the same as that of the P-MPR. same.

For example, P _{cmax and c} values applied for power control may be determined as the maximum values of P _{cmax and c} values calculated in the first parts 1250 to 1260, respectively. The P _{cmax, c} value reported may be a value corresponding to a period for transmitting the same sub-frame, in a P _{cmax, c} value, that is, all the TAG calculated in the first part (1250).

As another example, the value of P _{cmax , c} applied for power control may be determined as the value of P _{cmax , c} calculated in the first part 1250. The P _{cmax, c} value is also the P _{cmax, c} calculated at the first part (1250) are reported, that is, it may be a value corresponding to a period for transmitting the same sub-frame.

FIG. 13 is a diagram illustrating applying different maximum power reductions in the first to third parts of FIG. 12 according to the present invention.

Referring to FIG. 13, the MPR is 13 dB for the first part 1250 in (a), the MPR is 3 dB for the second part 1255 in (b), and the third part 1255 in (c). MPR is 1 dB. It can be seen that the MPR value is determined differently for each part.

14 is a flowchart illustrating a method of transmitting power information according to an embodiment of the present invention.

Referring to FIG. 14, the terminal calculates a maximum transmit power that can be output for each of a plurality of CCs, and calculates a maximum transmit power for each part by dividing parts for a period for transmitting different subframes in a TAG ( S1400). That is, when a part of transmitting different subframes in parallel for each TAG occurs at a certain time as different TAGs have different TA values, one or more parts of transmitting different subframes in parallel are generated. Separate the above parts and calculate P _{cmax and c} values for each part.

The terminal generates power information (S1405). In this case, the maximum transmit power transmitted by the terminal included in the power information may be determined as one of P _{cmax and c} values calculated for each part. For example, it may be a minimum value of P _{cmax , c} calculated for each part. As another example, a P _cmax calculated for each _part, the first part _c of the P _cmax, can be determined by the value _c.

The UE will perform uplink power control based on the P _{cmax and c} values determined through the above process. In the present invention it will be referred to as the designated P _{cmax, c} value of the power control P _{cmax, c.}

P _{cmax, c} as a value used to perform the power control P _{cmax, c} value and the power information transmitted from the terminal to separate the base station may be different. Herein, the information transmission P _{cmax and c will} be referred to.

The power information may be higher layer signaling such as a MAC message or an RRC message or may be physical layer signaling. The power information may refer to a MAC control element for power reporting. Alternatively, the power information may specifically refer to a MAC control element for reporting the maximum transmission power of the carrier. Alternatively, the power information may refer to both the MAC control element for surplus power reporting and the MAC control element for maximum carrier power reporting. Alternatively, the power information may mean a carrier maximum transmission power field.

An exemplary example of the power control of the present invention P _{cmax, c} is determined as a minimum value among the P _{cmax, c} calculation of each part, transfer information P _{cmax, c} is the P _{cmax, c} the first part (that is, the sync frame interval) Can be determined by a value.

In another embodiment, the power control P _{cmax , c} may be determined as the minimum value among P _{cmax , c} calculated for each part, and the information transfer P _{cmax , c} may also be determined as the minimum value among P _{cmax , c} calculated for each part.

In another embodiment, the power control P _{cmax , c} is determined by the value of P _{cmax , c} of the first part (that is, the sync frame interval) _, and the information transmission P _{cmax , c} is the minimum value among P _{cmax , c} calculated for each part. Can be determined.

In another embodiment, the power control P _{cmax , c} is determined by the value of P _{cmax , c} of the first part (that is, the sync frame period) _, and the information transfer P _{cmax , c is} also P of the first part (that is, the sync frame period). _{cmax, c} can be determined.

The terminal transmits power information to the base station (S1410). The base station obtains P _{cmax, c} information from the power information (S1415). As mentioned in the above embodiment, the base station may obtain a minimum value or obtain P _{cmax , c} of a sync frame interval.

The base station performs uplink scheduling for each CC based on the obtained P _{cmax and c} information (S1420). In addition, an uplink grant may be generated and informed to the terminal. The uplink grant is information corresponding to format 0 of downlink control information (DCI) transmitted on the PDCCH and may include information such as RB, modulation and coding scheme (MCS), and TPC. Accordingly, the base station may perform scheduling based on the obtained P _{cmax , c} information with a value different from a previously scheduled value of the RB, modulation and coding scheme (MCS), and TPC of the terminal.

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 protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (3)

In the multi-component carrier system in the power information transmission method by the terminal,
Check the overlapping section of the n-th frame of the subframe S1 determined by the arbitrary serving cell Cell1 and the n + 1th frame of the subframe S2 determined by the serving cell Cell2 or determine by the arbitrary serving cell Cell1 Identifying a section in which an nth frame of subframe S1 overlaps with an n-1th frame of subframe S2 determined by serving cell Cell2;
And determining a power control (Pcmax, c) value for the transmission power of the terminal in consideration of the overlapping subframe periods. The method of claim 1, wherein the power control (P _{cmax , c} ) is
And determining a minimum value among P _{cmax and c} calculated in the overlapping subframe period. The method of claim 1, wherein the power control (P _{cmax , c} ) is
A MAC subheader and a MAC control element, the MAC subheader including a logical channel identification field to identify that the MAC control element is a MAC control element for power reporting of at least one component carrier, transmitted via a MAC message Receiving power information, characterized in that.

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