KR20120001981A - Method for reporting transmitting power headroom in wireless communication system and apparatus therefor - Google Patents

Abstract

PURPOSE: A transmission power residual rate reporting method in a wireless communication system and apparatus therefor are provided to reduce power consumption by effectively reporting transmission power residual rate to a terminal. CONSTITUTION: A reception module receives parameters related to transmission power from a base station. A processor(810) measures a route loss value using the parameters. When the route loss value is higher than a standard value, the processor calculates a transmission power residual rate based on preset first maximum power. The transmission module transmits the transmission power residual rate to the base station. The first maximum power is lower than second maximum power included in the parameter.

Description

TECHNICAL FOR REPORTING TRANSMITTING POWER HEADROOM IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR}

The present invention relates to a wireless communication system. More specifically, the present invention relates to a transmission power remaining amount report method and apparatus therefor in a wireless communication system.

As an example of a mobile communication system to which the present invention may be applied, a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (LTE)) communication system will be described in brief.

1 is a diagram schematically illustrating an E-UMTS network structure as an example of a mobile communication system. The Evolved Universal Mobile Telecommunications System (E-UMTS) system evolved from the existing Universal Mobile Telecommunications System (UMTS), and is currently undergoing basic standardization work in 3GPP. In general, E-UMTS may be referred to as an LTE (Long Term Evolution) system. For details of the technical specifications of UMTS and E-UMTS, refer to Release 7 and Release 8 of "3rd Generation Partnership Project (Technical Specification Group Radio Access Network)" respectively.

1, an E-UMTS is located at the end of a user equipment (UE) 120, an eNode B (eNode B) 110a and 110b, and a network (E-UTRAN) And an access gateway (AG). The base station may transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.

One or more cells exist in one base station. The cell is set to one of the bandwidths of 1.25, 2.5, 5, 10, 15, 20Mhz and the like to provide downlink or uplink transmission service to a plurality of UEs. Different cells may be configured to provide different bandwidths. The base station controls data transmission and reception for a plurality of terminals. For downlink (DL) data, the base station transmits downlink scheduling information, which is related to time / frequency domain, encoding, data size, and hybrid automatic repeat and reQuest (HARQ) request for data to be transmitted to the corresponding UE. Give information and more. In addition, the base station transmits uplink scheduling information to the terminal for uplink (UL) data and informs the user equipment of time / frequency domain, encoding, data size, and hybrid automatic retransmission request information. An interface for transmitting user traffic or control traffic may be used between base stations. The Core Network (CN) can be composed of an AG and a network node for user registration of the UE. The AG manages the mobility of the UE in units of a tracking area (TA) composed of a plurality of cells.

Wireless communication technologies have been developed to LTE based on WCDMA, but the demands and expectations of users and operators are continuously increasing. In addition, as other radio access technologies continue to be developed, new technological evolution is required to be competitive in the future. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interface, and adequate power consumption of the terminal are required.

Recently, 3GPP has been working on standardization of follow-up technology for LTE. In the present specification, the above technique is referred to as "LTE-Advanced" or "LTE-A". One of the major differences between LTE and LTE-A systems is the difference in system bandwidth. The LTE-A system aims to support a broadband of up to 100 MHz, and for this purpose, a carrier aggregation or bandwidth aggregation technique for achieving broadband using a plurality of frequency blocks is intended. Carrier aggregation allows a plurality of frequency blocks to be used as one large logical frequency band in order to use a wider frequency band. The bandwidth of each frequency block may be defined based on the bandwidth of the system block used in the LTE system. Each frequency block is transmitted using a component carrier.

SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission power remaining amount reporting method and a device therefor in a wireless communication system.

Technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

Receiving parameters related to transmit power from a base station, which is an aspect of the present invention; Measuring a path loss value using the parameters; Calculating a residual amount of transmission power based on a first preset maximum power when the path loss value is greater than a reference path loss value; And transmitting the remaining amount of transmission power to the base station, wherein the first maximum power is less than a second maximum power included in the parameter, and the first maximum power and the second maximum power are transmitted by the terminal. It is characterized by the maximum possible power. The method may further include calculating a remaining amount of transmission power based on the second maximum power when the path loss value is smaller than the reference path loss value. Preferably, the second maximum power is 23 [dBm].

More preferably, the method further includes receiving grant information for transmitting an uplink signal from the base station, wherein the grant information is generated at the base station based on the remaining amount of transmission power. The grant information may include at least one of a resource block size and a transport block size for transmitting the uplink signal to the base station by the terminal.

In addition, a terminal apparatus of a wireless communication system according to another aspect of the present invention includes a receiving module for receiving parameters related to transmission power from a base station; A processor configured to measure a path loss value using the parameters, and calculate a residual amount of transmission power based on a first predetermined maximum power when the path loss value is greater than a reference path loss value; And a transmitting module for transmitting the remaining amount of transmission power to the base station, wherein the first maximum power is smaller than a second maximum power included in the parameter, and the first maximum power and the second maximum power are determined by the terminal. It is characterized by the maximum power that can be transmitted. The processor may calculate the remaining amount of transmission power based on the second maximum power when the path loss value is smaller than the reference path loss value.

Preferably, the processor receives grant information for transmitting an uplink signal from the base station, and the grant information is generated at the base station based on the remaining transmission power amount.

According to embodiments of the present invention, the terminal can effectively report the remaining transmission power in the wireless communication system. In particular, the terminal can reduce power consumption when transmitting an uplink signal, and can reduce interference between a neighbor cell and the terminal.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

1 is a diagram schematically illustrating an E-UMTS network structure as an example of a mobile communication system;
FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on a 3GPP radio access network standard; FIG.
FIG. 3 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same; FIG.
4 is a diagram illustrating a structure of a radio frame used in an LTE system;
5 is a diagram illustrating a structure of an uplink subframe used in an LTE system;
6 is a flowchart of a method of performing a transmission power remaining amount report according to an embodiment of the present invention;
7 is a view showing a result of performing a power remaining amount report according to an embodiment of the present invention;
8 illustrates a block diagram of a communication transceiver according to an embodiment of the present invention.

Hereinafter, the structure, operation and other features of the present invention will be readily understood by the embodiments of the present invention described with reference to the accompanying drawings. The embodiments described below are examples in which technical features of the present invention are applied to a 3GPP system.

Hereinafter, a system in which the system band uses a single frequency block is referred to as a legacy system or a narrowband system. Correspondingly, a system in which a system band includes a plurality of frequency blocks and uses at least one or more frequency blocks as a system block of a legacy system is referred to as an evolved system or a wideband system. The frequency block used as the legacy system block has the same size as the system block of the legacy system. On the other hand, the size of the remaining frequency blocks is not particularly limited. However, for system simplification, the size of the remaining frequency blocks may also be determined based on the system block size of the legacy system. For example, the 3GPP LTE system and the 3GPP LTE-A system are in a relationship between a legacy system and an evolved system.

Based on the above definition, the 3GPP LTE system is referred to herein as an LTE system or a legacy system. In addition, the terminal supporting the LTE system is referred to as an LTE terminal or a legacy terminal. Correspondingly, the 3GPP LTE-A system is referred to as LTE-A system or evolved system. In addition, a terminal supporting the LTE-A system is referred to as an LTE-A terminal or an evolved terminal.

For convenience, the present specification describes an embodiment of the present invention using an LTE system and an LTE-A system, but this is an example and the embodiment of the present invention can be applied to any communication system corresponding to the above definition. In addition, although the present invention is described with reference to the FDD scheme, the embodiments of the present invention can be easily modified to the H-FDD scheme or the TDD scheme.

2 is a diagram showing a control plane and a user plane structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard. The control plane refers to a path through which control messages used by a UE and a network are transferred. The user plane means a path through which data generated in the application layer, for example, voice data or Internet packet data, is transmitted.

The physical layer as the first layer provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to a medium access control layer (upper layer) through a transport channel. Data moves between the MAC layer and the physical layer over the transport channel. Data is transferred between the transmitting side and the receiving side physical layer through the physical channel. The physical channel utilizes time and frequency as radio resources. Specifically, the physical channel is modulated in the Orthogonal Frequency Division Multiple Access (OFDMA) scheme in the downlink, and modulated in the Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme in the uplink.

The Medium Access Control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is an upper layer, through a logical channel. The RLC layer of the second layer supports reliable data transmission. The function of the RLC layer may be implemented as a functional block inside the MAC. The PDCP (Packet Data Convergence Protocol) layer of the second layer provides unnecessary control for efficiently transmitting IP packets such as IPv4 or IPv6 over a narrow bandwidth air interface. It performs header compression function that reduces information.

The Radio Resource Control (RRC) layer located at the bottom of the third layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transport channels, and physical channels in connection with configuration, reconfiguration, and release of radio bearers. The radio bearer refers to a service provided by the second layer for data transmission between the terminal and the network. To this end, the terminal and the RRC layer of the network exchange RRC messages with each other. If there is an RRC connection (RRC Connected) between the UE and the RRC layer of the network, the UE is in the RRC Connected Mode, otherwise it is in the RRC Idle Mode. The Non-Access Stratum (NAS) layer at the top of the RRC layer performs functions such as session management and mobility management.

One cell constituting the base station eNB is set to one of the bandwidths of 1.25, 2.5, 5, 10, 15, 20Mhz and the like to provide a downlink or uplink transmission service to a plurality of terminals. Different cells may be configured to provide different bandwidths.

A downlink transmission channel for transmitting data from a network to a terminal includes a BCH (Broadcast Channel) for transmitting system information, a PCH (Paging Channel) for transmitting a paging message, a downlink SCH (Shared Channel) for transmitting user traffic or control messages, have. In case of a traffic or control message of a downlink multicast or broadcast service, it may be transmitted through a downlink SCH, or may be transmitted via a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the UE to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink SCH (shared channel) for transmitting user traffic or control messages. It is located above the transport channel, and the logical channel mapped to the transport channel is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and an MTCH (multicast). Traffic Channel).

FIG. 3 is a diagram for describing physical channels used in a 3GPP system and a general signal transmission method using the same.

When the terminal is turned on or newly enters a cell, the terminal performs an initial cell search operation such as synchronizing with the base station (S301). To this end, the terminal may receive a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station to synchronize with the base station and obtain information such as a cell ID. have. Then, the terminal can receive the physical broadcast channel from the base station and acquire the in-cell broadcast information. Meanwhile, the terminal may receive a downlink reference signal (DL RS) in an initial cell search step to check the downlink channel state.

After completing the initial cell search, the UE acquires more specific system information by receiving a physical downlink control channel (PDSCH) according to a physical downlink control channel (PDCCH) and information on the PDCCH. It may be (S302).

On the other hand, if the base station is initially connected or there is no radio resource for signal transmission, the mobile station can perform a random access procedure (RACH) on the base station (steps S303 to S306). To do this, the UE transmits a specific sequence through a Physical Random Access Channel (PRACH) (S303 and S305), and receives a response message for the preamble on the PDCCH and the corresponding PDSCH S304 and S306). In case of the contention-based RACH, a contention resolution procedure can be additionally performed.

After performing the procedure as described above, the UE performs a PDCCH / PDSCH reception (S307) and a physical uplink shared channel (PUSCH) / physical uplink control channel (Physical Uplink) as a general uplink / downlink signal transmission procedure. Control Channel (PUCCH) transmission (S308) may be performed. The control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), and the like. It includes. In the 3GPP LTE system, the terminal may transmit the above-described control information such as CQI / PMI / RI through the PUSCH and / or PUCCH.

4 is a diagram illustrating a structure of a radio frame used in an LTE system.

Referring to FIG. 4, a radio frame has a length of 10 ms (327200 * T _s ) and consists of 10 equally sized subframes. Each subframe has a length of 1 ms and consists of two slots. Each slot has a length of 0.5 ms (15360 * T _s ). Here, T _s represents a sampling time and is represented by Ts = 1 / (15 kHz * 2048) = 3.2552 * 10 ^-8 (about 33 ns). The slot includes a plurality of OFDM symbols or SC-FDMA symbols in the time domain and a plurality of resource blocks in the frequency domain. In an LTE system, one resource block includes 12 subcarriers * 7 (6) OFDM symbols or SC-FDMA symbols. Transmission time interval (TTI), which is a unit time for transmitting data, may be determined in units of one or more subframes. The structure of the above-described radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe, the number of OFDM symbols or SC-FDMA symbols included in the slot may be variously changed. have.

5 is a diagram illustrating a structure of an uplink subframe used in an LTE system.

Referring to FIG. 5, a subframe 500 having a length of 1 ms, which is a basic unit of LTE uplink transmission, is composed of two 0.5 ms slots 501. Assuming the length of a normal cyclic prefix (CP), each slot is composed of seven symbols 502 and one symbol corresponds to one SC-FDMA symbol. The resource block 503 is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and one slot in the time domain. The structure of the uplink subframe of LTE is largely divided into a data region 504 and a control region 505. Here, the data area means a series of communication resources used in transmitting data such as voice and packet transmitted to each terminal, and corresponds to the remaining resources except for the control area in the subframe. The control region means a series of communication resources used for transmitting downlink channel quality reports from each terminal, reception ACK / NACK for downlink signals, and uplink scheduling requests.

First, the terminal power control method of the base station according to the prior art will be described.

In the LTE system, a power (dBm) for transmitting a UL physical channel by the UE is determined by Equation 1 below.

는 인덱스 i 서브프레임에 할당된 PUSCH 대역폭이며 자원 블록 개수 단위로 표현된다.

와

는 상위 계층으로부터 시그널링되는 값이다. 또한,

는

가 1.25일 경우

이며,

가 0일 경우

는 0이다. 또한,

상위 계층에 의하여 시그널링되는 단말 특정 파라미터이다.In Equation 1

Is the PUSCH bandwidth allocated to the index i subframe and expressed in units of resource block number.

Wow

Is the value signaled from the higher layer. Also,

Is

Is 1.25

,

Is 0

Is 0. Also,

UE specific parameters signaled by higher layers.

In addition, the power for the terminal to transmit the uplink physical control channel and the sounding reference signal is determined by the following equation (2) and (3), respectively.

Here, P _cmax means the maximum power (actual maximum transmission power) that the terminal can transmit in the cell, which can be simply expressed as Equation 4 below.

Here, P _emax means the maximum power available to the terminal in the cell signaled by the base station. In addition, P _umax refers to a power in consideration of a maximum power reduction (MPR), an additional maximum power reduction (A-MPR), and the like to the maximum transmission power P _PowerClass of the terminal itself. In the current LTE system, the maximum power (P _PowerClass ) of the terminal itself is defined as Power Class 3, which means power of 23 dBm. MPR, on the other hand, is the maximum defined for a particular modulation order or resource block (RB) number to meet RF requirements defined in the standard (Spectrum Emission Mask (SEM), Adjacent Channel Leakage Ratio (ACLR), etc.). The amount of power reduction for transmit power, and A-MPR refers to the amount of power reduction for the maximum transmit power defined by the regional characteristics.

In particular, the current LTE standard of 3GPP defines the A-MPR value corresponding to the NS when the base station signals the network signaling (NS) according to the characteristics of each country and region. Currently, the protocol standard of the LTE system defines an information element (hereinafter referred to as IE) called AdditionalSpectrumEmission, which is configured to include 32 NSs. The A-MPR value corresponding to each NS is defined in 3GPP standard document TS36.101 and is currently defined in Table 8 as shown in Table 1.

Network  Signaling value Requirements  ( sub - clause ) E- UTRA Band Channel  bandwidth ( MHz ) Resources Blocks A- MPR  ( dB ) NS_01 NA NA NA NA NA NS_03 6.6.2.2.1 2, 4,10, 35, 36 3 > 5 = 1 6.6.2.2.1 2, 4,10, 35,36 5 > 6 = 1 6.6.2.2.1 2, 4,10, 35,36 10 > 6 = 1 6.6.2.2.1 2, 4,10,35,36 15 > 8 = 1 6.6.2.2.1 2, 4,10,35, 36 20 > 10 = 1 NS_04 6.6.2.2.2 TBD TBD TBD NS_05 6.6.3.3.1 One 10,15,20 = 50 for QPSK = 1 NS_06 6.6.2.2.3 12, 13, 14, 17 1.4, 3, 5, 10 n / a n / a NS_07 6.6.2.2.3
6.6.3.3.2 13 10 Table 6.2.4-2 Table 6.2.4-2 .. NS_32 - - - - -

The LTE standard of 3GPP broadcasts a Master Information Block (MIB) and a System Information Block (SIB) containing information about a corresponding cell in a cell through physical channels such as PBCH and PDSCH. Among them, SIBs are classified into various types, and information related to power of a terminal and network signaling (hereinafter referred to as NS) is transmitted through SIB type 1 and SIB type 2.

In SIB type1, a maximum power (P _emax ) of a terminal available in a corresponding cell is signaled through a field called p-max, and in SIB type2, an appropriate NS value for a corresponding cell is signaled through a field called 'additionalSpectrumEmission'. It is configured to recognize the A-MPR to the terminals present in the cell.

Meanwhile, the terminal reports its transmission power residual amount (Power Headroom) to the eNB to schedule the uplink resource block size and the transport block size of the terminal. Here, the transmission power remaining amount report is determined by Equation 5 below.

As described above, a scheme of signaling MPR or A-MPR through a higher layer has already been proposed as a method of limiting a maximum transmission power of a UE in 3GPP, but it is defined only in a specific bandwidth to prevent inter-cell interference and inter-terminal interference. Not only is it difficult to limit, there is a problem that consumes unnecessary power for the terminal.

First, since the biggest factor determining the uplink transmission power of the UE is pathloss, Equation 1 may be summarized as in Equation 6 below.

In the present invention, the reference path loss is set as a threshold value, and when the path loss measured by the terminal is greater than the reference path loss, P _cmax signaled by the base station Instead, it is proposed to perform the transmission power remaining amount report by setting the modified P _cmax value. That is, Equation 5 may be modified as in Equation 7 below.

6 is a flowchart of a method of performing a transmission power remaining amount report according to an embodiment of the present invention.

Referring to FIG. 6, the terminal calculates a path loss using Equation 6 and compares it with a reference path loss. In such a case, if the calculated path loss is larger than the reference path loss, the transmission power should be increased. Therefore, the remaining amount of transmission power needs to be reported. Therefore, the remaining transmission power is calculated by Equation 7 and reported to the base station.

On the other hand, if the calculated path loss is smaller than the reference path loss, the transmission power remaining amount is calculated and reported to the base station by Equation 5 as in the related art.

The base station performs scheduling to transmit an uplink signal according to the received transmission power remaining amount and instructs it to the terminal.

In addition, the value of the reference path loss can be calculated by way of example using Tables 2 and 3 below.

Reference channel A1-1 A1-2 A1-3 Allocated resource blocks 6 15 25 DFT-OFDM Symbols per subframe 12 12 12 Modulation QPSK QPSK QPSK Code rate 1/3 1/3 1/3 Payload size (bits) 600 1544 2216 Transport block CRC (bits) 24 24 24 Code block CRC size (bits) 0 0 0 Number of code blocks-C One One One Coded block size including 12bits trellis termination (bits) 1884 4716 6732 Total number of bits per sub-frame 1728 4320 7200 Total symbols per sub-frame 864 2160 3600

Table 2 shows conditions of reference channel bandwidths of E-UTRA disclosed in 3GPP TS 36.104. In this example, the resource block size and transport block size of Table 1 are used to calculate the reference path loss, and the values of Table 3 below are assumed for the purpose of illustration. It is obvious to those skilled in the art that the values in Table 3 may vary depending on the channel situation and the cell construction.

The condition of algorithm

-108 dBm

One

0 Modified P _cmax 20 dBm

When the reference path loss is calculated using Tables 2, 3, and Equation 6, it is shown in Tables 4 and 5.

가 0인 경우

Is 0

가 1.25인 경우

Is 1.25

7 is a diagram illustrating a result of performing a power remaining amount report according to an embodiment of the present invention.

Referring to FIG. 7, when the transmission power remaining amount report is performed by using the modified P _cmax value, the eNB appropriate resource block size and transport block size for uplink signals such as PUSCH and SRS do not exceed the modified P _cmax value. Since it is possible to allocate, it is possible to reduce the interference between the intercept cells and the interference between terminals, and to reduce the battery consumption by preventing unnecessary transmission power in the terminal.

8 illustrates a block diagram of a communication transceiver according to an embodiment of the present invention. The transceiver may be part of a base station or a terminal.

Referring to FIG. 8, the transceiver 800 includes a processor 810, a memory 820, an RF module 830, a display module 840, and a user interface module 850.

The transceiver 800 is shown for convenience of description and some modules may be omitted. In addition, the transceiver 800 may further include necessary modules. In addition, some modules in the transceiver 800 may be divided into more granular modules. The processor 820 is configured to perform an operation according to the embodiment of the present invention illustrated with reference to the drawings.

In detail, when the transceiver 800 is part of a base station, the processor 820 may generate a control signal and perform a function of mapping a control channel set in a plurality of frequency blocks. In addition, when the transceiver 800 is part of a terminal, the processor 820 may identify a control channel directed to the user from signals received from the plurality of frequency blocks and extract a control signal therefrom.

Thereafter, the processor 820 may perform a required operation based on the control signal. Detailed operations of the processor 820 may refer to the contents described with reference to FIGS. 1 to 7.

The memory 820 is connected to the processor 810 and stores an operating system, an application, program code, data, and the like. The RF module 830 is connected to the processor 810 and performs a function of converting a baseband signal into a radio signal or converting a radio signal into a baseband signal. To this end, the RF module 830 performs analog conversion, amplification, filtering and frequency up conversion, or a reverse process thereof. The display module 840 is connected to the processor 810 and displays various information. The display module 840 may use well-known elements such as, but not limited to, a liquid crystal display (LCD), a light emitting diode (LED), and an organic light emitting diode (OLED). The user interface module 850 is connected to the processor 810 and may be configured with a combination of well-known user interfaces such as a keypad and a touch screen.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.

In this document, the embodiments of the present invention have been mainly described with reference to the data transmission / reception relationship between the terminal and the base station. The specific operation described herein as being performed by the base station may be performed by its upper node, in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the terminal may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and the like.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The present invention can be applied to a wireless communication system. More specifically, the present invention can be applied to a method for reporting the remaining transmission power by a terminal in a wireless communication system and an apparatus therefor.

Claims (10)

A method for a terminal to report a remaining amount of transmission power in a wireless communication system,
Receiving parameters related to transmit power from a base station;
Measuring a path loss value using the parameters;
Calculating a residual amount of transmission power based on a first preset maximum power when the path loss value is greater than a reference path loss value; And
Transmitting the remaining amount of transmit power to the base station;
The first maximum power is less than a second maximum power included in the parameter,
The first maximum power and the second maximum power is characterized in that the maximum power that the terminal can transmit,
Transmit Power Remaining Reporting Method. The method of claim 1,
If the path loss value is less than a reference path loss value, further comprising calculating a residual amount of transmission power based on the second maximum power;
Transmit Power Remaining Reporting Method. The method of claim 1,
The second maximum power is,
It is characterized by being 23 [dBm],
Transmit Power Remaining Reporting Method. The method of claim 1,
Receiving grant information for transmitting an uplink signal from the base station;
The grant information is generated in the base station based on the remaining amount of transmission power,
Transmit Power Remaining Reporting Method. The method of claim 4, wherein
The grant information is,
The terminal includes at least one of a resource block size and a transport block size for transmitting the uplink signal to the base station,
Transmit Power Remaining Reporting Method. As a terminal device of a wireless communication system,
A receiving module for receiving parameters related to transmit power from a base station;
A processor configured to measure a path loss value using the parameters, and calculate a residual amount of transmission power based on a first predetermined maximum power when the path loss value is greater than a reference path loss value; And
A transmission module for transmitting the remaining amount of transmission power to the base station,
The first maximum power is less than a second maximum power included in the parameter,
The first maximum power and the second maximum power is characterized in that the maximum power that the terminal can transmit,
Terminal device. The method according to claim 6,
The processor comprising:
When the path loss value is smaller than the reference path loss value, the remaining amount of transmission power is calculated based on the second maximum power.
Terminal device. The method according to claim 6,
The second maximum power is,
It is characterized by being 23 [dBm],
Terminal device. The method according to claim 6,
The processor comprising:
Receiving grant information for transmitting an uplink signal from the base station,
The grant information is generated in the base station based on the remaining amount of transmission power,
Terminal device. The method according to claim 6,
The grant information is,
The terminal includes at least one of a resource block size and a transport block size for transmitting the uplink signal to the base station,
Terminal device.

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