KR20110137446A - Apparatus and method for transmitting power information in multiple component carrier system - Google Patents

Abstract

PURPOSE: A device and a method for transmitting power information in a multiple component carrier system are provided to configure an MAC(Medium Access) PDU(Control Protocol Data Unit) for transmitting power information. CONSTITUTION: A surplus power calculating unit(1705) obtains the residual power which is the difference between the maximum transmission power of the terminal per element carrier wave and power which is estimated about a real uplink transmission. A field generating unit(1710) generates a residual power field expressing the level of the residual power and the identification field whether the residual power is about the element carrier wave. An MAC PDU configuring unit(1715) configures a MAC PDU including the identifying field and the residual power field. A transceiver(1725) transmits the MAC PDU to a base station.

Description

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

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

3rd Generation Partnership Project (3GPP) long term evolution (LTE) and Institute of Electrical and Electronics Engineers (IEEE) 802.16m are being developed as candidates for the next generation wireless communication system. The 802.16m specification implies two aspects: past continuity, a modification to the existing 802.16e specification, and future continuity, a specification for the next generation of IMT-Advanced systems. Accordingly, the 802.16m standard requires all the advanced requirements for the IMT-Advanced system to be maintained while maintaining compatibility with the Mobile WiMAX system based on the 802.16e standard.

Wireless communication systems generally use one bandwidth for data transmission. For example, the second generation wireless communication system uses a bandwidth of 200KHz ~ 1.25MHz, the third generation wireless communication system uses a bandwidth of 5MHz ~ 10MHz. In order to support increasing transmission capacity, recent 3GPP LTE or 802.16m continues to expand its bandwidth to 20 MHz or more. In order to increase the transmission capacity, it is necessary to increase the bandwidth. However, even when the level of service required is low, supporting a large bandwidth can cause a large power consumption.

Accordingly, a multiple component carrier system has emerged, which defines a carrier having one bandwidth and a center frequency and enables transmission and / or reception of data over a wide band through a plurality of carriers. By using one or more carriers, it is possible to support narrowband and broadband at the same time. For example, if one carrier corresponds to a bandwidth of 5 MHz, it can support a maximum bandwidth of 20 MHz by using four carriers.

One way for the base station to efficiently utilize the resources of the terminal is to use the power information of the terminal. Power control technology is an essential core technology for minimizing interference factors and reducing battery consumption of a terminal for efficient allocation of resources in wireless communication.

However, the multi-component carrier system has not yet been determined as to whether to transmit power information for each component carrier.

An object of the present invention is to provide a method for transmitting power information by a terminal in a multi-component carrier system.

Another technical problem of the present invention is to provide an apparatus for transmitting power information in a multi-element carrier system.

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

Another technical problem of the present invention is to provide a method and apparatus for transmitting information indicating whether power information is transmitted in a multi-component carrier system.

Another technical problem of the present invention is to provide a method and apparatus for reporting surplus power excluding the sum of the transmit powers used in each component carrier in the maximum transmit power in a multi-element carrier system.

Another object of the present invention is to provide a method and apparatus for configuring a MAC PDU for reporting surplus power excluding the sum of the transmit powers used in each component carrier in the maximum transmit power in a multi-element carrier system.

According to an aspect of the present invention, a method of transmitting power information by a terminal in a multi-component carrier system is provided. The method comprises the steps of obtaining surplus power which is a difference between the maximum transmission power of the UE for each CC and the estimated power for actual uplink transmission, and constructing an identification field for identifying which CC of which CC is the surplus power. Constructing a surplus power field indicative of the surplus power level, generating a medium access control protocol data unit (MAP PDU) including the identification field and the surplus power field, and transmitting the MAC PDU to a base station Characterized in that it comprises a step.

According to another aspect of the present invention, there is provided an apparatus for transmitting power information in a multi-element carrier system. The apparatus includes a surplus power calculating unit for obtaining surplus power which is a difference between a maximum transmission power of a terminal for each component carrier and an estimated power for actual uplink transmission, an identification field for identifying which component carrier the surplus power relates to; A field generator for generating a surplus power field indicating the surplus power level, a MAC PDU configuration unit for constructing a MAC PDU including the identification field and the surplus power field, and a transceiver for transmitting the MAC PDU to a base station; Characterized in that.

By the new MAC PDU format, information on the power available to the UE for each CC can be transmitted, and the resource allocated as the control information can be used as it is, thereby reducing the overhead caused by the transmission of the power information. In the two MAC PDU structures according to the present invention, the number of bits in the LCID field of the MAC subheader and the surplus power field of the MAC control element can be significantly reduced.

In other words, according to the present specification, the reserved field may be used for the component carrier triggered by the surplus power transmission according to the present invention without increasing the existing LCID field. Therefore, it is possible to achieve the accuracy of surplus power transmission of each component carrier and to use a predetermined resource efficiently.

In addition, when the control information is transmitted, priority is given to surplus power transmission, so that the base station achieves efficiency of downlink scheduling and link adaptation.

1 shows a wireless communication system.
2 is an explanatory diagram illustrating the same intra-band contiguous carrier aggregation.
3 is an explanatory diagram illustrating the same in-band non-contiguous carrier aggregation.
4 is an explanatory diagram illustrating the same inter-band carrier aggregation.
5 shows an example of a protocol structure for supporting multiple carriers.
6 shows an example of a frame structure for multi-carrier operation.
FIG. 7 illustrates linkage between a downlink component carrier and an uplink component carrier in a multi-carrier system.
8 is an example of a graph showing surplus power on a time-frequency axis.
9 is another example of a graph showing surplus power on the time-frequency axis to which the present invention is applied.
10 is a structure of a MAC PDU according to an embodiment of the present invention.
11 is a block diagram illustrating a structure of a MAC subheader and a surplus power MAC control element according to an embodiment of the present invention.
12A and 12B are block diagrams illustrating structures of a MAC subheader and a surplus power MAC control element according to another example of the present invention.
13 is a diagram showing the structure of a MAC control element according to another embodiment of the present invention.
14 is a block diagram illustrating the structure of a MAC subheader and a MAC SDU according to an embodiment of the present invention.
15 is a block diagram illustrating a structure of a MAC subheader and a MAC SDU according to another embodiment of the present invention.
16 is a flowchart illustrating a method of transmitting a MAC PDU by a terminal in a multi-component carrier system according to an embodiment of the present invention.
17 is a block diagram illustrating an apparatus for transmitting a MAC PDU in a multi-component carrier system 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.

In addition, in describing the component of this specification, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but between components It will be understood that may be "connected", "coupled" or "connected".

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, 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 may again be divided into multiple regions (referred to as 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 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.

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.

Carrier aggregation includes intra-band contiguous carrier aggregation as shown in FIG. 2, intra-band non-contiguous carrier aggregation as shown in FIG. 3, and inter-band carrier as shown in FIG. Can be divided into aggregates.

First, referring to FIG. 2, in-band adjacent carrier aggregation is performed between consecutive CCs in the same band. For example, the aggregated CCs CC # 1, CC # 2, CC # 3, ..., CC #N are all adjacent.

Referring to FIG. 3, in-band non-adjacent carrier aggregation is achieved between discrete CCs. For example, the aggregated CCs CC # 1 and CC # 2 are spaced apart from each other by a specific frequency.

Referring to FIG. 4, when a plurality of CCs exist, one or more CCs are aggregated on different frequency bands. For example, CC # 1, which are aggregated CCs, exist in band # 1, and CC # 2 exists in band # 2.

The number of carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink CCs and the number of uplink CCs are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.

In addition, the size (ie bandwidth) of the CCs may be different. For example, assuming that 5 CCs are used for a 70 MHz band configuration, 5 MHz CC (carrier # 0) + 20 MHz CC (carrier # 1) + 20 MHz CC (carrier # 2) + 20 MHz CC (carrier # 3) It may be configured as + 5MHz CC (carrier # 4).

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.

5 shows an example of a protocol structure for supporting multiple carriers.

Referring to FIG. 5, the common medium access control (MAC) entity 510 manages a physical layer 520 using a plurality of carriers. The MAC management message transmitted on a specific carrier may be applied to other carriers. That is, the MAC management message is a message capable of controlling other carriers including the specific carrier. The physical layer 520 may operate in a time division duplex (TDD) and / or a frequency division duplex (FDD).

There are several physical control channels used in the physical layer 520. 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).

6 shows an example of a frame structure for multi-carrier operation.

Referring to FIG. 6, a radio frame includes 10 subframes. The subframe includes a plurality of OFDM symbols. Each CC may have its own control channel (eg, PDCCH). CCs may or may not be adjacent to each other. The terminal may support one or more CCs according to its capability.

The CC may be divided into a fully configured CC and a partially configured CC according to directionality. The preconfigured CC refers to a carrier capable of transmitting and / or receiving all control signals and data on a bidirectional carrier, and the partial set CC refers to a carrier capable of transmitting only downlink data on a unidirectional carrier. The partially configured CC may be mainly used for a multicast and broadcast service (MBS) and / or a single frequency network (SFN).

CC may be divided into Primary Component Carrier (PCC) and Secondary Component Carrier (SCC) 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. The PCC may be a preset carrier file, and is a carrier to which main control information is exchanged between the base station and the terminal. The SCC may be a preset carrier or a partially configured carrier file, and is a carrier assigned according to a request of a terminal or an indication of a base station. The PCC may be used for network entry of the terminal and / or allocation of the SCC. The PCC may be selected from among preset carriers rather than being fixed to a specific carrier. The carrier set to SCC may also be changed to PCC.

FIG. 7 illustrates linkage between a downlink component carrier and an uplink component carrier in a multi-carrier system.

Referring to FIG. 7, in downlink, downlink component carriers (hereinafter, referred to as DL CCs) D1, D2, and D2 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.

An example of an UL CC connected to a DL CC is as follows.

1) a UL CC to which the terminal transmits ACK / NACK information on data transmitted by the base station through the DL CC,

2) a DL CC to which the base station transmits ACK / NACK information with respect to data transmitted by the terminal through the UL CC,

3) when the UE, which starts the random access procedure, receives a random access preamble (RAP) transmitted through the UL CC, the DL CC to transmit a response thereto;

4) When the base station transmits uplink control information through the DL CC, it is a UL CC to which the uplink control information is applied.

FIG. 7 illustrates only a 1: 1 connection setting between a DL CC and an UL CC, but it is a matter of course that a connection setting of 1: n or n: 1 may 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.

In the following, the surplus power (Power Headroom) PH is described.

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

The surplus power PH may be called power headroom PH, 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 by the CCs in the maximum transmit power of the terminal set by the base station.

As an example, P _estimated is equal to the 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.

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, P _PH can be obtained by equation (3).

P _PH according to Equation 3 is expressed as a graph in the time-frequency axis, as shown in FIG. 8. This represents P _PH for one CC.

Referring to FIG. 8, the set maximum output power P _max of the terminal includes a P _PH 805, a P _PUSCH 810, and a P _PUCCH 815. That is, surplus power other than P _PUSCH 810 and P _PUCCH 815 at P _max is defined as P _PH 805. Each power is calculated in units of a transmission time interval (TTI).

In a multi-component carrier system, surplus power may be individually defined for a plurality of CCs, which are represented graphically in the time-frequency axis as shown in FIG. 9.

Referring to FIG. 9, the set maximum output power P _max of the terminal corresponds to the maximum output power P _{CC # 1} , P _{CC # 2} , ..., for each CC # 1, CC # 2, ..., CC #N. It is equal to the sum of P _{CC #N} .

Assuming that P _{CC # 1} = P _{CC # 2} = ... = P _{CC #N} = P _CC , the P _PH 905 of CC # 1 is P _CC- P _PUSCH 910-P _PUCCH 915 P _PH 920 of CC #n is the same as P _CC -P _PUSCH 925 -P _PUCCH 930. The maximum output power level for each CC is fixed, and P _PH , P _PUSCH , and P _PUCCH exist at different ratios for each CC. In other words, the power ratio per CC is differently allocated.

The presence of multiple CCs means that there may be multiple pathlosses. In addition, surplus power may vary for each CC due to multiple path losses.

For example, when CC # 1, CC # 2, CC # 3 is allocated to the terminal, surplus power P _PH1 for CC # 1 is -8dB, surplus power P _PH2 for CC # 2 is -10dB, CC # The surplus power P _PH3 for ₃ may be 0 dB. Since the surplus power is different for each CC as described above, the terminal should inform the base station of a field (hereinafter, referred to as the surplus power field) indicating the surplus power value for each CC. That is, the terminal may transmit a plurality of surplus power fields to the base station.

The power headroom field (PH field) is an information field indicating a surplus power value and may have a size of 6 bits as an example. Table 1 below shows a surplus power field and a surplus power field table indicating surplus power values.

PH field Power headroom level Measured Quantity Value (dB) 0 Power Headroom_0 -23≤P _PH ≤-22 One Power headroom_1 -22≤P _PH ≤-21 2 Power headroom_2 -21≤P _PH ≤-20 3 Power Headroom_3 -20≤P _PH ≤-19 ... ... ... 60 Power Headroom_60 37≤P _PH ≤38 61 Power Headroom_61 38≤P _PH ≤39 62 Power Headroom_62 39≤P _PH ≤40 63 Power Headroom_63 P _PH ≥40

Referring to Table 1, the value of surplus power is in the range of -23dB to + 40dB. Since the surplus power MAC control element is 6 bits, 2 ⁶ = 64 indexes can be indicated, and the surplus power values are divided into 64 levels.

For example, the field indicates that the excessive power is zero (that is, 6 bits represents 000 000 Im) when the surplus electric power value of a specific CC -23≤P _PH ≤-22dB. There may be a plurality of surplus power fields in one MAC PDU. This is because a plurality of CCs exist in a multi-carrier system, and surplus power may be set differently for each CC.

The surplus power field is a MAC level message and is processed by the MAC layer. Thus, the surplus power field is included in the MAC PDU. In particular, the surplus power field may be included in a MAC control element (CE) and / or MAC payload.

In one embodiment, all surplus power fields may be included in the MAC control element or the MAC payload.

For example, the first surplus power field for CC # 1 may be included in the first MAC control element, and the second surplus power field for CC # 2 may be included in the second MAC control element. Alternatively, the first surplus power field for CC # 1 may be included in the first MAC payload, and the second surplus power field for CC # 2 may be included in the second MAC payload.

In another embodiment, some surplus power fields may be included in the MAC control element and the remaining surplus power fields may be included in the MAC payload. For example, the first surplus power field for CC # 1 may be included in the first MAC control element, and the second surplus power field for CC # 2 may be included in the first MAC payload.

In order to describe the MAC control element and the MAC payload including the surplus power field in more detail, the structure of the MAC PDU is described first.

10 is a structure of a MAC PDU according to an embodiment of the present invention. MAC PDUs are also called Transport Blocks (TBs).

Referring to FIG. 10, the MAC PDU 1000 includes a MAC header 1010, at least one MAC control element 1020, 1025, at least one MAC Service Data Unit 1030-1, 1030-m) and padding 1040.

MAC control elements 1020 and 1025 are control messages generated by the MAC layer. When the MAC control elements 1020,..., 1025 include a surplus power field, they are referred to as surplus power MAC control elements.

The MAC SDUs 1030-1,... 1030-m are the same as the RLC PDUs delivered in the Radko Link Control (RLC) layer. Padding 1040 is a predetermined number of bits added to make the size of the MAC PDU constant. The MAC control elements 1020,..., 1025, MAC SDUs 1030-1,... 100-m, and padding 1040 together are also referred to as MAC payloads.

MAC header 1010 includes at least one sub-header (1010-1, 1010-2, ..., 1010-k), each subheader (1010-1, 1010-2, ... .1010-k) corresponds to one MAC SDU or one MAC control element or padding. The order of the subheaders 1010-1, 1010-2,..., 1010-k is arranged in the same order as the corresponding MAC SDUs, MAC control elements or paddings within the MAC PDU 1000.

Each subheader 1010-1, 1010-2, ..., 1010-k contains four fields: R, R, E, LCID, or R, R, E, LCID, F, L Field may be included. 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, in accordance with the present invention, the LCID field identifies which CC the surplus power MAC control element includes the surplus power field for.

There is one LCID field for each MAC SDU, MAC control element or padding. When a MAC control element or MAC payload includes a surplus power field, which CC the surplus power field relates to may be identified by an LCID field.

11 is a block diagram illustrating a structure of a MAC subheader and a surplus power MAC control element according to an embodiment of the present invention. This is the case when the surplus power MAC control element includes a surplus power field.

Referring to FIG. 11, a surplus power MAC control element (MAC CE) 1150 includes two R fields 1155 and a surplus power field (PH field) 1160, and a MAC subheader 1100 has a value of 2. R fields 1105, E fields 1110, and LCID fields 1115. The R field 1105 is an extra bit remaining. The E field 1110 is an extension field indicating whether an additional LCID field 1115 exists in the subheader.

If the E field 1110 is set to 1, it means that another LCID field 1115 and a set of the E field 1110 are followed by the E field 1110. If the E field 1110 is set to 0, it means that the MAC payload follows the E field 1110.

When the LCID field 1115 indicates that the MAC control element is a surplus power MAC control element (PH MAC CE), it can be seen that the surplus power MAC control element includes a surplus power field 1160. Further, the LCID field 1115 identifies which CC the surplus power field 1160 relates to by indicating a specific value. Table 2 is an example of an LCID field 1115.

Index LCID values 00000 CCCH 00001-01010 Identity of the logical channel 01011-10101 Reserved 10110 Power Headroom Report for CC # 1 10111 Power Headroom Report for CC # 2 11000 Power Headroom Report for CC # 3 11001 Power Headroom Report for CC # 4 11010 Power Headroom Report for CC # 5 11011 C-RNTI 11100 Truncated BSR 11101 Short bsr 11110 Long bsr 11111 Padding

Referring to Table 2, the LCID field values of 10110 to 11010 indicate that the MAC control element 1150 is a surplus power MAC control element. Each of the LCID field values 10110 through 11010 indicates that the surplus power field 1160 of the MAC control element 1150 is redundant with respect to any one of CC # 1, CC # 2, CC # 3, CC # 4, and CC # 5. Indicates power value. That is, the LCID field 1115 identifies which CC the surplus power field 1160 relates to.

For example, if the LCID field value is 10110, the surplus power field 1160 indicates that it is related to CC # 1. If the LCID field value is 11010, the surplus power field 1160 indicates that it is related to CC # 5. In this manner, the surplus power fields for the plurality of CCs can be identified. Of course, the mapping between the index and the CC indication does not necessarily have to be as shown in Table 2, which is merely an example.

That is, assuming N CCs, a portion in which N indexes are reserved in the LCID field table is used. Accordingly, a total of 5N bits are allocated as the LCID field necessary to transmit the surplus power fields for N CCs. Meanwhile, the surplus power field of the MAC control element has a size of 6 bits for each CC since there is no part different from the existing scheme.

The plurality of surplus power fields may be transmitted through a single MAC PDU or a plurality of MAC PDUs. As an example, the terminal may transmit the surplus power field for all CCs or the surplus power field for some CCs to the base station using one MAC PDU.

For example, the first surplus power field for CC # 1 and the second surplus power field for CC # 2 may be included in one MAC PDU and transmitted. If the surplus power field is 6 bits, the number of bits required for one MAC PDU to transmit two surplus power fields is 2 (CC number) x 6 (bits / CC) = 12 bits. That is, the number of bits required to transmit the surplus power fields for N CCs is obtained from the following equation (4).

Here, N _{PH fields} is the total number of bits required for transmission of all surplus power fields, and N is the number of CCs.

As another example, the surplus power field for each CC may be divided and transmitted through the MAC PDU of the corresponding CC. For example, the first surplus power field for CC # 1 is included in the first MAC PDU and transmitted through CC # 1, and the second surplus power field for CC # 2 is included in the second MAC PDU to provide CC # 1. 2, the third surplus power field for CC # 3 is included in the third MAC PDU and transmitted through CC # 3.

As another example, the surplus power field for each CC may be divided and transmitted through the MAC PDU of any CC. For example, the first surplus power field for CC # 1 is included in the first MAC PDU and transmitted over CC # 1, while the second surplus power field for CC # 2 and the third surplus for CC # 3 are included. The power fields are all included in the second MAC PDU and transmitted through CC # 2.

12A is a block diagram illustrating a structure of a MAC subheader and a surplus power MAC control element according to another example of the present invention.

Referring to FIG. 12A, the MAC PDU 1200 includes a plurality of MAC subheaders (1210-1, ..., 1210-i, ..., 1120-k) and a plurality of surplus power MAC control elements ( PH MAC CE, 1250-1, ..., 1250-i, ..., 1250-k) (i≤ k). The MAC subheader 1120-i includes two R fields 1125-i, an E field 1220-i, and an LCID field 1225-i. The surplus power MAC control element 1250-i includes two R fields 1125-i and a surplus power field 1260-i. It is different from FIG. 11 in that a plurality of surplus power MAC control elements 1250-i including the surplus power field 1260-i exist. The value of the LCID field 1225-i follows Table 2 above.

For example, when the CCs configured in the UE are CC # 1, CC # 2, and CC # 3 (that is, k = 3), the MAC PDU 1200 includes three MAC subheaders 1210-1 and 1210-2. 1210-3) and three surplus power MAC control elements 1250-1, 1250-2, and 1250-3.

The MAC subheader 1210-1 includes an LCID field 1225-1, and the LCID field 1225-1 is 10110 indicating that the surplus power field 1260-1 is for CC # 1. In this manner, the LCID field 1225-2 is 10111 indicating that the surplus power field 1260-2 is for CC # 2, and the LCID field 1225-3 is the surplus power field 1260-3. 11000 indicating that it is for CC # 3.

12A illustrates that a plurality of surplus power fields are transmitted in one MAC PDU, but this is merely an example. As described above, a plurality of surplus power fields may be divided into a plurality of MAC PDUs and transmitted.

12B is a block diagram illustrating a structure of a MAC subheader and a surplus power MAC control element according to another embodiment of the present invention.

Referring to FIG. 12B, the MAC PDU 1200 includes a plurality of MAC subheaders (1210-1, ..., 1210-i, ..., 1120-k) and a plurality of surplus power MAC control elements ( PH MAC CE, 1250-1, ..., 1250-i, ..., 1250-k) (i≤ k).

The MAC subheader 1120-i includes an R1 field and an R2 field 1125-i, an E field 1220-i, and an LCID field 1225-i. The surplus power MAC control element 1250-i includes an R1 'field and an R2' field 1125-i and a surplus power field 1260-i. It is different from FIG. 11 in that a plurality of surplus power MAC control elements 1250-i including the surplus power field 1260-i exist. The value of the LCID field 1225-i follows Table 3 below.

Index LCID values 00000 CCCH 00001-01010 Identity of the logical channel 01011-11001 Reserved 11010 Power Headroom Report for CC 11011 C-RNTI 11100 Truncated BSR 11101 Short bsr 11110 Long bsr 11111 Padding

Referring to Table 3, the LCID field 1225-i indicates that the corresponding MAC subheader 1120-i is a surplus power MAC subheader, and does not indicate which CC the surplus power field 1126-i is about. . That is, when the value of the LCID field 1225-i is 11010, this indicates that the corresponding MAC subheader 1120-i is a surplus power MAC subheader.

Here, which CC the surplus power field 1260-i relates to is indicated by the R1 and R2 fields 1125-i and the R1 'and R2' fields 1125-i. That is, since the R field is an already allocated field or is not used, it may indicate a specific CC using this. For example, three of the R1, R2, R1 ', and R2' fields may be selected to indicate which CC the surplus power field 1260-i relates to.

Since three R fields are 3 bits, a total of 2 ³ = 8 cases can be represented. Alternatively, if only two R fields are selected, a total of 2 ² = 4 CCs may be indicated. If there are 5 total CCs, all of them must be able to be represented, so 3 R fields should be used. The three R fields may be any of R1 and R2 fields 1125-i and R1 'and R2' fields 1125-i. Table 4 below shows CCs that can be represented by three R fields.

CC index _{Indication bits (3bits: R LCID R} 1PH R 2PH) CC1 000 CC2 001 CC3 010 CC4 011 CC5 100

Therefore, assuming N CCs, since only one index is used in the LCID field table regardless of the number of CCs, only 5 bits of the LCID field for the transmission of the surplus power field are allocated, and the surplus power of the MAC control element. The field has a size of 6 bits for each CC as in the conventional method. In case of Release 8 or 9 of LTE, since only one CC is used, only 5 bits are allocated as LCID fields as shown in Table 3, and the surplus power field of the MAC control element is 6 bits as in the conventional method. However, unlike Table 4, all R fields are set to '0'.

13 is a diagram showing the structure of a MAC control element according to another embodiment of the present invention.

Referring to FIG. 13, the surplus power MAC control element 1300 includes two M fields (Mode Field) 1305 and a surplus power field (PH Field) 1310. The redundant power MAC control element 1300 differs from FIG. 11 in that it includes two M fields 1305 instead of two R fields 1155. The M field 1305 indicates whether the corresponding MAC PDU includes a surplus power field for all CCs or only a surplus power field for some CCs.

For example, when the CC configured in the terminal is CC # 1, CC # 2, CC # 3 (that is, k = 3), if any one of the M field 1305 is 0, the corresponding MAC PDU is assigned to CC # 1 It indicates that the surplus power field relating to the surplus power field related to CC # 3 and the surplus power field related to CC # 2 are included.

Conversely, if either M field 1305 is 1, it may indicate that the corresponding MAC PDU includes only surplus power fields for some CCs, for example, CC # 1 and CC # 2. Of course, what the M field 1305 indicates may be changed. Here, which CC the surplus power field 1310 relates to may be determined by the LCID field of the MAC subheader as shown in Table 2.

Of course, the base station knows whether the LCID field and the corresponding surplus power field 1126-i are present, whether the surplus power field for the entire CC is implicitly transmitted or some surplus power field is transmitted, and thus the M field 1305. ) May be omitted.

14 is a block diagram illustrating the structure of a MAC subheader and a MAC SDU according to an embodiment of the present invention. This is the case where the surplus power field is included in the MAC SDU.

Referring to FIG. 14, the MAC PDU 1400 includes a MAC subheader 1410 and a MAC SDU 1450. The MAC SDU 1450 includes a surplus power field (PH Field) 1460, and the MAC subheader 1410 includes two R fields 1415, an E field 1420, an LCID field 1425, and an F field 1430. ) And L field 1435. LCID field 1425 identifies which CC the surplus power field 1460 relates to by indicating a particular value. The LCID field 1425 is determined by Table 2 above.

The E field 1420 is an extension field indicating whether an additional LCID field 1425 and an L field 1435 exist in the subheader. If the E field 1420 is set to 1 then it is followed by another set of LCID fields 1425 and E fields 1420 after the E field 1420. If the E field 1420 is set to 0, it means that the MAC payload follows the E field 1420. The L field 1435 is a field indicating the length of the corresponding MAC SDU 1450, and there is one L field 1435 per one MAC SDU 1450 included in the MAC PDU 1400.

15 is a block diagram illustrating a structure of a MAC subheader and a MAC SDU according to another embodiment of the present invention. This is the case where the MAC SDU includes a surplus power field.

Referring to FIG. 15, MAC PDU 1500 includes MAC subheaders 1510-1,... 1510-i,... 1510-k and MAC SDUs 1550-1,. ..1550-k). The MAC SDU 1550-i includes a surplus power field (PH Field 1560-i), the MAC subheader 1510-i includes two R fields 1151-i, an E field 1152-i, LCID field 1525-i, F field 1553-i and L field 1553-i.

The LCID field 1525-i identifies which CC the surplus power field 1560-i relates to by indicating a particular value. The LCID field 1525-i is determined by Table 2 above. In this manner, the surplus power fields for k CCs can be identified.

16 is a flowchart illustrating a method of transmitting a MAC PDU by a terminal in a multi-component carrier system according to an embodiment of the present invention.

Referring to FIG. 16, the terminal measures a path loss value for each of the plurality of CCs (S1600).

In the LTE system to which the present invention is applied, uplink data transmission is performed through an uplink shared channel, and one of the elements necessary for the terminal to determine the transmission power of the uplink shared channel is a path loss estimate. . This value is measured by the terminal based on a reference symbol received power (RSRP).

On the other hand, closed-loop power control (Closed-loop power control) is a terminal to control the uplink transmission power by the Transmit Power Control (TPC) command. The TPC command is transmitted to the terminal by the base station by the target SINR (Measured received SINR) value and the measured SINR (Measured received SINR) value. If the target SINR is larger than the measured SINR, the base station requests the terminal to increase the transmission power and vice versa .

The terminal calculates surplus power for each CC based on the measured path loss value for each CC (S1605).

For example, when surplus power is determined by Equation 2, the maximum transmit power and PUSCH transmit power for CC # 1 are P _max1 and P _PUSCH1 , respectively, and the maximum transmit power and PUSCH transmit for CC # 2 are respectively. If the power is P _max2 , P _PUSCH2 , the surplus power for CC # 1 is P _max1- P _PUSCH1, and the surplus power for CC # 1 is P _max2- P _PUSCH2 .

The terminal maps the obtained surplus power value for each CC to the surplus power field with reference to the surplus power field table of Table 5 (S1610).

PH field Power headroom level Measured Quantity Value (dB) 0 Power Headroom_0 -23≤P _PH ≤-22 One Power headroom_1 -22≤P _PH ≤-21 2 Power headroom_2 -21≤P _PH ≤-20 3 Power Headroom_3 -20≤P _PH ≤-19 ... ... ... 60 Power Headroom_60 37≤P _PH ≤38 61 Power Headroom_61 38≤P _PH ≤39 62 Power Headroom_62 39≤P _PH ≤40 63 Power Headroom_63 P _PH ≥40

When the surplus power field for each CC is determined, it is necessary to inform the base station which CC the surplus power field relates to, using the LCID field.

Therefore, the terminal determines the LCID field and the MAC CE (S1615). As an example, the LCID field may be determined with reference to the LCID field table of Table 6 below.

Index LCID values 00000 CCCH 00001-01010 Identity of the logical channel 01011-10101 Reserved 10110 Power Headroom Report for CC # 1 10111 Power Headroom Report for CC # 2 11000 Power Headroom Report for CC # 3 11001 Power Headroom Report for CC # 4 11010 Power Headroom Report for CC # 5 11011 C-RNTI 11100 Truncated BSR 11101 Short bsr 11110 Long bsr 11111 Padding

Table 6 is the same as Table 1 above. For example, if the surplus power fields for CC # 1 and CC # 3 are generated, the LCID fields are 10110 and 11000, respectively.

As another example, the LCID field may be determined with reference to the LCID field table of Table 7 below.

Index LCID values 00000 CCCH 00001-01010 Identity of the logical channel 01011-11001 Reserved 11010 Power Headroom Report for CC 11011 C-RNTI 11100 Truncated BSR 11101 Short bsr 11110 Long bsr 11111 Padding

Table 7 is the same as Table 3 above. The LCID field does not separately indicate which CC the surplus power field is related to, but merely serves to indicate that the surplus power field is transmitted through a corresponding MAC PDU. Therefore, the LCID field is 11010.

Here, which CC the surplus power field relates to is indicated by the R field of the MAC subheader and / or the R field of the MAC control element. This has been explained in detail in Figure 12B above. That is, when the LCID field is 10110, it is determined using the R field to indicate which CC the mapped surplus power field relates to, as shown in Table 8 below.

CC index Indication bits (3bits: R ₁ R ₂ R ₁ ') CC1 000 CC2 001 CC3 010 CC4 011 CC5 100

The terminal configures a MAC PDU including the determined LCID field and the mapped surplus power field (S1620).

As already mentioned, the LCID field identifies which CC the surplus power field to be transmitted relates to. More specifically, the determined LCID field is included in the MAC subheader of the MAC PDU.

In addition, the mapped surplus power field is included in the surplus power MAC control element and / or MAC payload of the MAC PDU. As an example of the case where the surplus power field is included in the MAC control element (CE), when the UE performs the surplus power report on CC # 1, CC # 4, the MAC PDU is configured as shown in Table 9 below. The MAC PDU configured by the LCID field table of Table 6 is called Type1, and the MAC PDU configured by the LCID field table of Table 7 is called Type2.

Type MAC PDU MAC Subheader1 MAC Subheader2 MAC CE1 MAC CE2 R R E LCID R R E LCID R R PH Field R R PH Field One - - - 10110 - - - 11001 - - 00011 - - 11101 2 0 0 - 11010 0 One - 11010 0 - 00111 One - 01001

Referring to Table 9, MAC PDUs are divided into Type 1 and Type 2. Type1 is a MAC PDU structure according to FIG. 12A, and Type2 is a MAC PDU structure according to FIG. 12B.

First, the MAC PDU of Type 1 is composed of a MAC subheader 1, a MAC subheader 2, a MAC control element 1 (MAC CE1), and a MAC control element 2 (MAC CE2).

Since the LCID of MAC subheader 1 is 10110, indicating CC # 1, and the surplus power field value of MAC control element 1 corresponding to MAC subheader 1 is 00011, the surplus power value for CC # 1 is -20≤P. Indicates that _PH ≦ -19.

Further, since the LCID of the MAC subheader 2 indicates CC # 4 as 11001, and the surplus power field value of the MAC control element 2 corresponding to the MAC subheader 2 is 11101, the surplus power value for the CC # 4 is 38≤P. _It indicates _PH ≦ 39. Here, the R field included in the MAC subheader and the MAC control element does not include separate information.

Next, referring to the MAC PDU of Type 2, like the Type 1, it consists of the MAC subheader 1, MAC subheader 2, MAC control element 1, MAC control element 2. However, unlike Type1, the LCID field of all MAC subheaders is 11010, indicating that the MAC control element is a surplus power MAC control element.

Which CC the surplus power field of each MAC control element relates to is indicated by the R field. The value of the two R fields of MAC subheader 1 is 00, and the value of the first R field of MAC control element 1 is zero. According to Table 8, since 000 indicates CC # 1, it can be seen that the surplus power field of MAC subheader 1 relates to CC # 1.

Similarly, the value of the two R fields of MAC subheader 2 is 01, and the value of the first R field of MAC control element 2 is 1. According to Table 8, since 011 indicates CC # 4, it can be seen that the surplus power field of MAC subheader 2 relates to CC # 4.

As another example, in the case of Type2, two R fields of the MAC subheader 1, a value of the first R field of the MAC control element 1 or two R fields of the MAC subheader 1, and a first R of the MAC control element 2 The value of the field may be used to indicate the CC to which the transmission of the surplus power field is indicated. Here, whether the MAC control element 2 is present may be indicated by using an L field indicating the length of the MAC subheader. In the case of Type2, the LCID field of MAC subheader 2 may be set to be the same as the LCID field of MAC subheader 1. Alternatively, the actual value may not be assigned.

Here, the MAC control element may further include an M field indicating whether to transmit a surplus power field for all CCs set in the terminal (first mode) or only a surplus power field for some CCs (second mode). Can be.

As such, when the MAC PDU includes LCID fields and surplus power fields for a plurality of CCs, the base station may obtain a first surplus power field for CC # 1 from the first LCID field, from which CC # 1 Know the surplus power for. In addition, the base station can obtain the fourth surplus power field for CC # 4 by the second LCID field, from which the base station can know the surplus power for CC # 4.

The terminal determines whether the surplus power report is triggered (S1625).

If the surplus power transmission is triggered, the terminal requests uplink scheduling (Uplink Scheduling) to the base station (S1630), and receives an uplink grant (Uplink Grant) (S1635). At this time, the UE requests uplink scheduling for all CCs. Thereafter, an uplink grant for each CC for all CCs is received or an uplink grant is received for selected CCs.

Or, the terminal requests uplink scheduling for all CCs for surplus power reporting, or requests uplink scheduling for CCs selected for surplus power reporting. Thereafter, an uplink grant for each CC for all CCs for surplus power reporting is received, or an uplink grant is received for selected CCs for surplus power reporting.

In addition, the terminal transmits the configured MAC PDU (s) to a base station by using an uplink resource according to the received uplink grant (S1640).

In this case, the MAC PDU (s) may be transmitted through a PCC, or may be transmitted divided into each CC. In step 1640, the transmission of the MAC PDU configured in connection with the surplus power reporting for all CCs may be transmitted through one CC or multiple CCs. Here, one CC may be a PCC, and a plurality of CCs include the PCC and also include SCCs.

For example, when performing surplus power reporting for CC1 to CC5, the whole, if the PCC is CC2, the transmission of the MAC PDU configured for the CC1 to CC5 (for) through CC2 is performed. Alternatively, the MAC PDU configured for CC1 to CC5 is transmitted through CC2, which is the PCC, and CC3 having a good channel state, that is, a large surplus power value. Alternatively, the MAC PDU configured for the CC1 to CC5 is performed through the CC1, CC3 to CC5, including the PCC CC2.

Meanwhile, the transmission of the MAC PDU configured in connection with the surplus power reporting for the CCs selected in step 1640 may be transmitted through one CC of the selected CCs or through the selected CCs. .

For example, when performing surplus power reporting for CC1 to CC3 and CC5, if the PCC is CC2, transmission of the configured MAC PDU for CC1 to CC3 and CC5 is performed through CC2. Alternatively, the transmission of the MAC PDU configured for the CC1 to CC3 and the CC5 may be performed through the CCC CC2, any CC4 having a good channel state, and the CC5. Alternatively, the MAC PDU configured for the CC1 to CC3 and CC5 is transmitted through the CC1 to CC3 and CC5 including the PCC CC2.

If the surplus power transmission is not triggered, the terminal measures the next path loss value (S1600) and repeats the subsequent steps.

The condition under which surplus power transmission is triggered is one of the following cases.

When the UE has an uplink resource for new transmission, the path loss change is larger than a specific threshold, when the prohibit surplus power report timer expires.

When the periodic surplus power reporting timer expires,

-When setting or resetting surplus power report by upper layer

The surplus power report is measured every 1 subframe period. In addition, it is measured only in the subframe when the PUSCH is transmitted. In addition, the delay of the surplus power report is defined as the interval between the start of the surplus power reference period and the time when the terminal starts to transmit the surplus power field on the air interface.

17 is a block diagram illustrating an apparatus for transmitting a MAC PDU in a multi-component carrier system according to an embodiment of the present invention. The MAC PDU transmitter may be part of the terminal.

Referring to FIG. 17, the MAC PDU transmitter 1700 may include a surplus power calculator 1705, a field generator 1710, a MAC PDU configuration unit 1715, a trigger determination unit 1720, and a transceiver 1725. Include.

The surplus power calculating unit 1705 calculates surplus power for each CC based on the maximum transmission power of the terminal and the estimated power for uplink transmission. The calculation method of surplus power is based on Equations 1 to 3 above.

The field generator 1710 generates various fields required for surplus power transmission for a plurality of CCs, that is, at least one LCID field, at least one surplus power field, and at least one M field. The LCID field is generated with reference to the LCID field table of Table 4, and identifies which CC the corresponding surplus power field relates to. Each surplus power field indicates the level of surplus power of the terminal for each CC according to Table 3, and the M field indicates a transmission mode of the surplus power field, that is, the surplus power field for all CCs set in the terminal is transmitted or It indicates whether only the surplus power field for some CCs is transmitted.

The MAC PDU configuration unit 1715 generates a MAC subheader based on the LCID field, and generates a surplus power MAC control element and / or MAC SDU based on the surplus power field and the M field. The MAC PDU configuration unit 1715 configures a MAC PDU based on the MAC subheader, the MAC control element, and / or the MAC SDU. The MAC PDU configuration unit 1715 may include the surplus power fields for all CCs in a single MAC PDU, or may be included in a plurality of different MAC PDUs.

The trigger determiner 1720 determines whether the surplus power report is triggered. The surplus power report means transmitting the MAC PDU. The trigger is one of the following cases. i) When the UE has uplink resources for new transmission, when the path loss change is greater than a certain threshold, when the prohibit surplus power reporting timer expires, ii) The periodic surplus power reporting timer expires. Iii) when setting or resetting surplus power reporting by a higher layer.

When the surplus power report is triggered by the trigger determination unit 1720, the transceiver 1725 is instructed to transmit the MAC PDU, and the transceiver 1725 transmits the MAC PDU.

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 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 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 (14)

In a method of transmitting power information by a terminal in a multiple component carrier system,
Obtaining surplus power which is a difference between the maximum transmit power of the MS for each CC and the estimated power for actual uplink transmission;
Constructing an identification field identifying which component carrier the surplus power relates to;
Constructing a surplus power field indicative of the level of surplus power;
Configuring a MAC PDU (Medium Access Control Protocol Data Unit) including the identification field and the surplus power field; And
Transmitting the MAC PDU to a base station. The method of claim 1,
The MAC PDU includes a MAC subheader, a MAC control element, and a MAC Service Data Unit (SDU), the MAC subheader including the identification field, and the MAC control element or the MAC SDU. The power information transmission method, characterized in that it comprises the surplus power field. The method of claim 2,
The MAC control element further includes a mode field for identifying whether the MAC PDU includes a surplus power field for all component carriers configured for the UE or a surplus power field for some component carriers. A power information transmission method. The method of claim 1,
The MAC PDU comprises a plurality of identification fields and a plurality of surplus power fields. The method of claim 1,
The power estimated for the actual uplink transmission is characterized in that the transmission power of the Physical Uplink Shared CHannel (PUSCH), power information transmission method. The method of claim 1,
The power estimated for the actual uplink transmission is a sum of the transmission power of the PUSCH and the transmission power of the physical uplink control channel (PUCCH), power information transmission method. The method of claim 1, wherein before transmitting the MAC PDU to a base station:
Requesting the base station for uplink scheduling for transmission of the MAC PDU; And
Receiving uplink scheduling information from the base station;
The MAC PDU is transmitted using the uplink resource according to the uplink scheduling information, power information transmission method. In the apparatus for transmitting power information in a multi-element carrier system,
A surplus power calculation unit for calculating surplus power which is a difference between the maximum transmission power of the MS for each CC and the estimated power for actual uplink transmission;
A field generating unit for generating an identification field for identifying which component carrier the surplus power relates to and a surplus power field indicating a level of the surplus power;
A MAC PDU configuration unit constituting a MAC PDU including the identification field and the surplus power field; And
And a transmitter / receiver for transmitting the MAC PDU to a base station. A method of reporting surplus power in a wireless communication system supporting a plurality of CCs,
Mapping a surplus power value excluding the sum of the transmit powers used in each CC from the maximum transmit power of the UE to a 6-bit separated index set in consideration of a relative parameter of each CC;
A header including a logical channel ID (LCID) indicating a surplus power report, information indicating the component carrier on which the surplus power report is triggered among the plurality of component carriers, and a surplus power value of the triggered component carrier are mapped Constructing a Media Control Access (MAC) Protocol Data Unit (PDU) including an index; And
And transmitting the configured MAC PDU on the uplink. 10. The method of claim 9, wherein the index in which the information indicating the component carrier triggered by the surplus power report of the plurality of component carriers and the surplus power value of the triggered component carrier is mapped is a medium control approach (MAC) of the MAC PDU. Redundant power reporting method, characterized in that included in the control element. The method of claim 9,
Transmitting the configured MAC PDU on the uplink,
Surplus power reporting method characterized in that the terminal transmits to the base station via a major carrier. The method of claim 9,
Transmitting the configured MAC PDU on the uplink,
The terminal transmits a surplus power of the plurality of CCs to the base station through any CC or any CC selected from the CCs triggered by the surplus power report triggered the excess power reporting method to the base station . The component carrier of claim 12, wherein the UE is triggered by a surplus power report among the plurality of component carriers.
Redundant power carriers configured by the terminal or a subset of all component carriers selected by the terminal. A method of reporting surplus power in a wireless communication system supporting a plurality of CCs,
Mapping a surplus power value excluding the sum of the transmit powers used in each CC from the maximum transmit power of the UE to a 6-bit separated index set in consideration of a relative parameter of each CC;
Media control including a header including a logical channel ID (LCID) is set corresponding to the component carrier triggered by the surplus power report of the plurality of component carriers, and the index mapped to the surplus power value of the triggered component carriers Configuring an access (MAC) protocol data unit (PDU); And
And transmitting the configured MAC PDU on the uplink.

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