WO2013109091A1

WO2013109091A1 - Apparatus and method for transmitting power information in multiple component carrier system

Info

Publication number: WO2013109091A1
Application number: PCT/KR2013/000416
Authority: WO
Inventors: 안재현; 권기범; 허강석
Original assignee: 주식회사 팬택
Priority date: 2012-01-20
Filing date: 2013-01-18
Publication date: 2013-07-25
Also published as: KR20130085884A

Abstract

The present invention provides an apparatus and a method for transmitting power information by a terminal in a multiple component carrier system. The method disclosed in the present specification comprises: checking a period in which the nth frame from among subframes determined by a first serving cell and the n+1th frame from among subframes determined by a second serving cell are overlapped with each other, or checking a period in which the nth frame from among subframes determined by a first serving cell and the n-1th frame from among subframes determined by a second serving cell are overlapped with each other; and determining power information including maximum carrier transmission power for controlling transmission power of the terminal based on the overlapped period.

Description

Apparatus and method for transmitting power information in multi-element 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, as a scheduling method for minimizing interference and ensuring battery consumption of a terminal for efficient allocation of resources, a transmission power control (TPC), modulation and coding level (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-component carrier system includes n + of subframes determined by a second serving cell and n + th subframes determined by a first serving cell. Confirm the section in which the first frame overlaps, or the section in which the n-th frame among the subframes determined by the first serving cell and the n-1 frame among the subframes determined by the second serving cell overlap. And determining power information including a maximum carrier power for controlling a transmission power of the terminal based on the checked result.

According to another aspect of the present invention, a method for receiving power information by a base station in a multi-element carrier system includes n + of subframes determined by a second serving cell and n + th subframes determined by a first serving cell. Confirm the section in which the first frame overlaps, or the section in which the n-th frame among the subframes determined by the first serving cell and the n-1 frame among the subframes determined by the second serving cell overlap. Receiving power information including the maximum carrier power determined by the carrier and performing uplink scheduling for each carrier based on the power information.

According to another aspect of the present invention, a terminal for transmitting power information in a multi-component carrier system is n + 1 of the n-th frame of the sub-frame determined by the first serving cell and the sub-frame determined by the second serving cell Checking a section in which the first frame overlaps, or checking a section in which an n-th frame among the subframes determined by the first serving cell and an n-1 th frame among the subframes determined by the second serving cell overlap And a power information generation unit for determining power information including a maximum carrier power for controlling the transmission power of the terminal based on the result of the checking and the result of the check.

According to another aspect of the present invention, in a multi-component carrier system, the base station receiving power information includes n + 1 of subframes determined by the second serving cell and nth frame of the subframes determined by the first serving cell. Confirm a section in which the first frame overlaps, or check a section in which the n-th frame among the subframes determined by the first serving cell and the n-1 th frame among the subframes determined by the second serving cell overlap A receiver for receiving power information including the determined maximum transmission power and a scheduling unit for performing uplink scheduling for each carrier based on the power information.

According to the present invention, when different subframes are transmitted simultaneously, power information values (eg, P _cmax values) may be configured.

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 the 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 illustrating a method of determining a 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 the accompanying 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 addition, in describing the embodiments of the present specification, when it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present specification, the detailed description thereof will be omitted.

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, the present invention is characterized in that the terminal supports a plurality of component carriers, and calculates the transmission power in consideration of subframes determined by each component carrier for the configured cell.

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

In addition, the present specification describes a wireless communication network, the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting data in the system (for example, the base station) that is in charge of the wireless communication network, or the corresponding wireless Work may be done at the terminal coupled to the network.

1 shows a wireless communication system.

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

The wireless communication system 10 includes at least one base station (BS) 11. Each base station 11 provides a communication service for a specific geographic area (generally called a cell) 15a, 15b, 15c. The cell can in turn be divided into a number of regions (called sectors).

The mobile station (MS) 12 may be fixed or mobile, and may include a user equipment (UE), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms.

The base station 11 generally refers to a fixed station communicating with the terminal 12, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. have. The cell should be interpreted in a comprehensive sense of a part of the area covered by the base station 11 and encompasses various coverage areas such as megacells, macrocells, microcells, picocells and femtocells.

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

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

There is no limitation on the multiple access scheme applied to the wireless communication system. Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA (SC-FDMA), OFDM-FDMA, OFDM-TDMA For example, various multiple access schemes such as OFDM-CDMA may be used. The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

Layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) model, which is well known in communication systems. (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 resource allocation of uplink transmission. The 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. Physical uplink control channel (PUCCH) carries uplink control information such as HARQ ACK / NAK, scheduling request, and CQI for downlink transmission. 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 UE configures a PUCCH for at least one or more of information on channel quality information (CQI), information on a selected precoding matrix index (PMI), or rank indicator (RI) based on the 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 a PUCCH capable of transmitting ACK / NACK is not allocated from the base station, the ACK / NACK information can be carried on the PUSCH.

The second data layer, the radio 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 logical channels and transport channels. The MAC layer selects an appropriate transport channel for transmitting data transmitted from the RLC layer, and supplies necessary control information to a header of a MAC protocol data unit (PDU). Add to The RLC layer is located above the MAC to support reliable transmission of data. In addition, the RLC layer segments and concatenates RLC Service Data Units (SDUs) delivered from a higher layer to configure data of an appropriate size for a wireless section. The RLC layer of the receiver supports a reassemble function of data 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 terminal and the network. Various RRC states such as an idle mode and an RRC connected mode are defined according to the communication state of the UE, and transition between RRC states is possible as needed. The RRC layer defines various procedures related to radio resource management such as system information broadcasting, RRC connection management procedure, multi-element carrier setup procedure, radio bearer control procedure, security procedure, measurement procedure, mobility management procedure (handover), etc. 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, to prevent cost increase due to the introduction of wideband radio frequency (RF) devices, and to 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. PCC is always active carrier, SCC is a carrier that is activated / deactivated according to a specific condition. Activation refers to the transmission or reception of traffic data being made or in a ready state. Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible. The terminal may use only one PCC, or may use one or more SCCs together with the PCC. The terminal may be assigned a PCC and / or SCC from the base station.

Hereinafter, a multiple carrier system refers to a system supporting carrier aggregation. Adjacent carrier aggregation and / or non-adjacent carrier aggregation may be used in a multi-carrier system, 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.

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 an index of DL CC and Ui is an index of UL CC (i = 1, 2, 3). At least one DL CC is a PCC and the rest is an SCC. Similarly, at least one UL CC is a PCC and the rest are SCCs. For example, D1 and U1 are PCCs, and D2, U2, D3, and U3 are SCCs.

In the FDD system, the DL CC and the UL CC are configured to be connected 1: 1, D1 is connected to U1, D2 is set to U2, and D3 is set to 1: 1 to U3. 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 configuration may be set 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. In addition, the index of the component carrier does not correspond to the order of the component carrier or the position of the frequency band of the component carrier.

Hereinafter, the surplus power (Power Headroom) PH will be described.

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 18W (= 9W * 2) 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) Estimation 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 signal 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.

Equation 1

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

As an example, P _estimated is equal to the power P _PUSCH estimated for transmission of a physical uplink shared channel (hereinafter, referred to as 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.

Equation 2

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.

Equation 3

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. Accordingly, since the PUCCH cannot be transmitted in the secondary serving cell, surplus power is determined as in Equation 2, and parameters and operations 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.

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. Accordingly, the terminal calculates a transmission power amount at t0 according to the uplink grant.

At time t0, the UE weights a PUSCH power offset (400) value received from the base station and a transmission power control (TPC, 405) value and a path loss between the base station and the UE (PL, 410). The primary transmit power 425 is calculated in consideration of the value (eg, a value received from the base station). The first transmission power (1st Tx Power) 425 may be determined by a parameter affected by a path environment between the base station and the terminal and a parameter determined by a policy of the network.

In addition, the UE considers a second transmission power (2nd Tx Power) by considering a QPSK modulation scheme included in an uplink grant and a scheduling parameter 415 indicating allocation of 10 resource blocks (RBs). 430). 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 is changed 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 . do. That is, the surplus power estimation value error 455 by 'P _cmax-H -P _cmax ' occurs.

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.

In both the single component carrier system and the multi-component carrier system, the maximum transmit 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 allowed range, also referred to as Maximum Power Reduction (MPR). The amount of power reduced by the power adjustment is referred to as the power adjustment amount.

There is a case where the maximum transmission power set in the terminal must be limited by the type of signal to be transmitted currently based on the hardware configuration (especially RF) in the terminal.

An example of the range of maximum transmission power in consideration of power adjustment is as follows.

Equation 4

Here, P _cmax is the maximum transmission power set for the UE, _P-L is the minimum value of _cmax _cmax P, _{P-H cmax} is the maximum value of P _cmax. More specifically, P _cmax-L and P _cmax-H can be calculated by the following equations, respectively.

Equation 5

Equation 6

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. As the amount of power, it may be 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. 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 units of terminals, may be defined in units of CCs, or may be set to a predetermined range or a constant in each CC. 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 'ΔT _C = 0', the maximum value P _cmax−H of the maximum transmit power P _cmax may be 23 dB corresponding to 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. . The surplus power PH and 510 is obtained by subtracting the uplink transmission power 530 from the maximum transmission power P _cmax .

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 may 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} ). In the following _description , P _{cmax, c} and P _cmax may be mixed, and P _cmax and P _{cmax, c} both mean the maximum transmission power of the carrier.

Meanwhile, scheduling cases of various CCs may exist in a multi-component carrier environment. Transmission of P _{cmax, c} information is required for each case. 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, c} may be the same among a plurality of CCs according to a scheduling configuration. Since P _{cmax, c} is a value related to the characteristics of 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, an RB configuration, an MCS configuration, and the like scheduled to the UE.

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

1. Definition and Expression Method of Carrier Maximum Transmission 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. The carrier maximum transmit power may be given as a range value such as _'20 dB≤P _cmax.c <22dB ', or may be given as a constant such as 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 can all be set to P _cmax.c1, UL UL CC2 and CC3 are set to P _cmax.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 maximum carrier 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 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 transmit power in 3 bits and 5 bits will be described. However, the present invention is not limited to these bits only.

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

Table 1

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 maximum carrier transmit power range is 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.

For example, each step of the range of the maximum carrier power of the carrier may be different by a predetermined size, that is, 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 the maximum power reduction (MPR) may be set based on the power class.

Table 2 is another example of the range mapping table according to 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.

TABLE 2

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 2, 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 maximum carrier transmit power range is 19 _≦ P _cmax.c <20.

Table 3 is another example of the range mapping table according to the present invention. The range mapping table may be configured by setting the dB difference at each step of the lower index based on the power class.

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 another example of the range mapping table according to 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.

Table 4

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, index 19 indicates that the range of carrier maximum transmit power is 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.

Table 4 lists the 1dB differences between each stage. Of course, the range mapping table may be configured to have an n dB 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

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 'R, R, E, LCID' or six fields 'R, R, E, LCID, F, 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 ID (LCID) field is an identification field for identifying a logical channel corresponding to a MAC SDU or 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. It identifies whether the DRX (Discontinuous Reception) command MAC control element for the command 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.

Table 5

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 '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, 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 each CC, a negotiation is first made about which CC is reported between the terminal and the base station. If not, 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 report target CC should be specified, and the set of report target CCs is referred to as a power report cell group (PRCG). That is, only the CC belonging to the power report cell group is reported to the maximum transmission power of the carrier, the carrier is not reported to the maximum transmission power for the CC otherwise.

Specifically, there is a first mode in which the terminal informs the base station dynamically as bitmap information which CC belongs to the power report cell group, or a second mode in which the terminal and the base station pre-provision. 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, included in the MAC control element for surplus power reporting, or included in the MAC control element for maximum transmission power reporting.

Criteria for selecting a power report cell group may be various embodiments.

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

7 illustrates an example of a method for selecting a power report cell group according to the present invention. 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 may be selected as the power reporting cell group.

8 illustrates 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. 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 may be 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. When C _i is 1, surplus power values and P _{cmax and c} values for the corresponding cell are configured or set in the corresponding MAC CE. R means reserved bits. V is a bit indicating whether the corresponding PH value and P _{cmax, c} value are calculated by actual transmission. If V is 1, the corresponding PH value and P _{cmax, c} value does not cause actual transmission of the corresponding cell at the time of transmission. Therefore, the PH CE and P _{cmax, c} values virtually calculated by the predetermined rule are configured in the MAC CE. PH is a field containing surplus power values. P is set to 1 for a corresponding cell when the value of P _{cmax, c} changes due to power management. P _{cmax, c} means P _cmax value in each cell.

10 is a block diagram illustrating a terminal and a base station for transmitting and 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 generator 1010 expresses or sets a carrier maximum transmission 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, the maximum transmission power to be transmitted by the terminal may be the minimum value of P _{cmax, c} calculated for each part. As another example, the maximum transmit power terminal is transmitted, it can be determined by P _{cmax, c} value of P _{cmax, c} of the first calculation part for each part.

Based on the value of P _{cmax, c} determined through the above process, the terminal performs uplink power control. The determined P _{cmax, c} value is also referred to as 'power control P _{cmax, c} '. P _{cmax, c} as the value of the power information transmitted to the base station in the P _{cmax, c} value and the terminal used for the power control can be distinguished. Here, P _{cmax, c} as power information transmitted from the terminal to the base station is also referred to as 'information transfer P _{cmax, c} '.

According to an embodiment of the present invention, the power control P _{cmax, c} is determined as the minimum value among P _{cmax, c} calculated for each part, and the information transfer P _{cmax, c} is P _cmax, of the first part (eg, a sync frame interval) _{. It} can be determined by the value of _c .

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 as the value of P _{cmax, c} of the first part (that is, the sync frame interval) _, and the information transfer 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 (ie, the synchronous frame period) _, and the information transfer P _{cmax, c is} also determined by the first part (ie, the synchronous frame period). P _{cmax, c} value can be determined.

In this case, the power information may be higher layer signaling such as a MAC message or an RRC message or may be physical layer signaling. Alternatively, the power information may refer to a MAC control element for power reporting. Or, the power information may 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 the 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 may represent or set a carrier maximum transmission 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. As an example, the maximum transmission power transmitted by the terminal may be a minimum value of P _{cmax, c} calculated by the terminal for each part. As another example, the maximum transmission power that the mobile station transmission can be determined by P _{cmax, c} value of P _{cmax, c} of the first calculation part for each part.

The maximum transmit power transmitted by the terminal may be distinguished from a value of 'power control P _{cmax, c} ' in which the terminal performs uplink power control. Here, P _{cmax, c} as power information transmitted from the terminal to the base station is also referred to as 'information transfer P _{cmax, c} '.

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. The uplink grant is information corresponding to format 0 of the downlink control information transmitted through the PDCCH and may include information such as RB, modulation and coding scheme (MCS), and TPC.

The base station 1050 may further include a transmitter for transmitting the uplink grant to the terminal (not shown).

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 (or different TAGs), there is a period 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.

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, in the sTAG ₂ 1220 that transmits a subframe by applying the TA3 1225, a period in which the subframe 21224 is transmitted is indicated by a first part 1250, a second part 1255, and a first part. It can be divided into three parts (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 'synchronous 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, when the UE calculates the value of P _{cmax, c} , 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, in calculating the P _{cmax, c} value, the UE determines that the n-th frame of the subframe S1 determined by any serving cell Cell ₁ and the n-1 th frame of the subframe S2 determined by the serving cell Cell ₂ Calculate considering the overlapping sections.

For example, based on subframe 2 1224 of sTAG ₂ 1220, subframe 3 1206 of pTAG 1200 that is another serving cell group, and subframe 2 1214 of sTAG ₁ 1210. And overlap with 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 P _{cmax, c} values calculated for the first parts 1250 to ₃₂₆₀ may be different from each other, the terminal determines the P _{cmax, c} value to be transmitted in consideration of this.

For example, the terminal calculates P _{cmax, c} values in the first parts 1250 to _3260, respectively, and transmits the most appropriate P _{cmax, c} value to the base station through the power information. .

Through this, it is possible to solve the problem that the accuracy is lowered by calculating the P _{cmax, c} value based on the same subframe in the carrier aggregation situation.

P _{cmax, c} value may be calculated using the following equations (7) to (10).

Equation 7

Here, P _{cmax, c} is the maximum transmit power set in the terminal for the serving cell c, P _{cmax_L, c} is P _cmax, the minimum value, P _{cmax_H, _c,} _c is the maximum value of P _cmax.

Specifically, P _{cmax_L, c} is calculated as in Equation 8 in the contiguous carrier aggregation of the intra-band, and the non-contiguous carrier of the inter-band In the aggregation, it may be calculated as in Equation 9. On the other hand, P _{cmax_H} can be calculated by the following equation (10).

Equation 8

Equation 9

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 the band for the serving cell c The amount of power applied when there is uplink transmission at the edge of the terminal has 1.5dB or 0dB 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, and Table 6 below shows an example of ΔT _{IB, c} .

Table 6

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

According to another embodiment of the present invention, the terminal determines the P _{cmax, c} value applied for power control as the maximum value of the P _{cmax, c} values calculated in the first parts 1250 to _3260, respectively. Can be. 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).

Another example embodiment of the present invention, the terminal can be determined by the P _{cmax, c} calculated at the first part 1250, a P _{cmax, c} value is applied for power control. 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.

13 is a diagram illustrating the application of a different maximum power reduction in each part 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.

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 point as different TAGs have different TA values, the UE transmits one part in parallel transmitting different subframes. Or divide into more parts and calculate P _{cmax, c} value for each part.

Following step S1400, 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, the 'maximum transmit power to be transmitted by the terminal' may be a minimum value of P _{cmax, c} calculated for each part.

As another example, "maximum UE transmission power is transmitted, it can be determined by P _{cmax, c} value of the first part of the P _{cmax, c} calculated for each part.

The UE may perform uplink power control based on the P _{cmax, c} value determined through the above process. The determined P _{cmax, c} values can be referred to as "power control P _{cmax, c} '. P _{cmax, c} value as a power information transmitted from the used to perform the power control P _{cmax, c} value and the terminal to the base station are distinguished, where the P _cmax as the power information transmitted from the terminal to the base _{station, c} is _the "communication It may be referred to as P _{cmax, c} '.

According to an embodiment of the present invention, the power control P _{cmax, c} is determined as the minimum value among P _{cmax, c} calculated for each part, and the information transmission P _{cmax, c} is P _cmax of the first part (that is, the sync frame interval) _{, It} can be determined by the value of _c .

Subsequently to step S1405, the terminal transmits power information to the base station (S1410), and the base station obtains a value of P _{cmax, c} from the power information (S1415). The base station may obtain the obtain the minimum value among the P _{cmax, c} calculated for each part or section of the synchronization frame P _{cmax, c} as discussed in the above embodiment.

Following step S1415, the base station performs uplink scheduling for each CC based on the obtained P _{cmax, c} information (S1420). The base station may generate an uplink grant and transmit it to the terminal. Here, the uplink grant is information corresponding to format 0 of downlink control information (DCI) transmitted through the PDCCH and may include information such as RB, modulation and coding scheme (MCS), and TPC.

The base station may perform scheduling based on the obtained P _{cmax, c} information to a value different from a previously scheduled value of the RB, modulation and coding scheme (MCS), and TPC of the terminal.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited thereto. 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

In the multi-component carrier system in the power information transmission method by the terminal,

Check the overlapping interval of the nth frame among the subframes determined by the first serving cell and the n + 1th frame among the subframes determined by the second serving cell or the subframe determined by the first serving cell Identifying a section in which an n-th frame among the n-th frames of the subframes determined by the second serving cell overlaps; And

And determining power information including a maximum carrier power for controlling a transmission power of the terminal based on the result of the checking.
The method of claim 1, wherein the carrier maximum transmit power is

And determining the minimum value among the maximum carrier power values calculated based on the result of the checking.
The method of claim 1, wherein the carrier maximum transmit power is

And a maximum transmission power value of a carrier in a section in which a subframe having the same value is transmitted among the maximum carrier power values calculated based on the checked result.
The method of claim 1,

Determining an information transmission carrier maximum transmit power which is a carrier maximum transmit power for uplink scheduling of the base station; And

And transmitting power information including the information transmission carrier maximum transmission power to the base station.
The method of claim 1,

The maximum transmission power of the carrier includes a media access control (MAC) subheader and a MAC control element,

The MAC subheader includes a logical channel identification field identifying that the MAC control element is for power reporting of at least one component carrier,

The MAC subheader is transmitted through a MAC message, characterized in that for transmitting power information.
A method of receiving power information by a base station in a multi-element carrier system,

Check the overlapping interval of the nth frame among the subframes determined by the first serving cell and the n + 1th frame among the subframes determined by the second serving cell or the subframe determined by the first serving cell Receiving power information including a carrier maximum transmit power determined by checking a region where an n-th frame of the nth frame and a subframe determined by the second serving cell overlap each other; And

And performing uplink scheduling for each carrier based on the power information.
The method of claim 6, wherein the carrier maximum transmission power

And determining the minimum value among the maximum carrier power values calculated based on the result of the checking.
The method of claim 6, wherein the carrier maximum transmission power

And a maximum transmission power value of a carrier in a section in which a subframe having the same value is transmitted among the maximum carrier power values calculated based on the checked result.
7. The method of claim 6, wherein performing uplink scheduling

And generating an uplink grant including a resource block, modulation and coding scheme or transmission power control information, and transmitting the generated uplink grant to the terminal.
A terminal for transmitting power information in a multi-component carrier system,

Check the overlapping interval of the nth frame among the subframes determined by the first serving cell and the n + 1th frame among the subframes determined by the second serving cell or the subframe determined by the first serving cell A power calculator for checking a section in which an n-th frame of the n-th frame and the subframe determined by the second serving cell overlap each other; And

On the basis of the result of the check, characterized in that it comprises a power information generation unit for determining the power information including the maximum transmission power of the carrier for controlling the transmission power of the terminal.
The method of claim 10, wherein the power information generating unit

And determining the maximum transmission power of the carrier as the minimum value among the maximum transmission power values calculated based on the result of the checking.
The method of claim 10, wherein the power information generating unit

Characterized in that the maximum carrier power is determined as the maximum carrier power value of a section in which a subframe having the same value is transmitted among the maximum carrier power values calculated based on the result of the checking.
The method of claim 10,

The power information generation unit determines the maximum information transmission carrier maximum transmission power of the carrier maximum transmission power for uplink scheduling of the base station,

And a transmission unit for transmitting the power information including the maximum transmission power of the information transmission carrier to the base station.
The method of claim 10,

The power information generation unit

The carrier maximum transmission power is determined to include a media access control (MAC) subheader and a MAC control element,

The MAC subheader includes a logical channel identification field identifying that the MAC control element is for power reporting of at least one component carrier,

The MAC subheader is transmitted through a MAC message.
In the base station for receiving power information in a multi-component carrier system,

Check the overlapping interval of the nth frame among the subframes determined by the first serving cell and the n + 1th frame among the subframes determined by the second serving cell or the subframe determined by the first serving cell A receiving unit receiving power information including a maximum transmission power determined by checking a section in which an n-th frame of the n-th frame and a subframe determined by the second serving cell overlap each other; And

And a scheduling unit configured to perform uplink scheduling for each carrier based on the checked result.
The method of claim 15, wherein the scheduling unit

Generate an uplink grant including resource blocks, modulation and coding schemes or transmit power control information,

The base station further comprises a transmitting unit for transmitting the uplink grant to the terminal.