KR20130027086A - Apparatus and method for performing power headroom report - Google Patents

Abstract

PURPOSE: A PHR(Power Headroom Report) execution device and a method thereof are provided to trigger a PHR according to the change of PB(Power Back-off) in a wireless communication system. CONSTITUTION: A trigger blocking unit(2310) measures a first block timer, the increase amount or decrease amount of PB, and the change amount of PL(Path Loss) for a serving cell set in a terminal. The first blocking timer is used for blocking the trigger of a PHR. The trigger blocking unit generates or blocks the trigger of a first PHR based on the change amount of the PL or the trigger of a second PHR based on the decrease amount of the PB. The trigger blocking unit generates or blocks the trigger of a third PHR based on the increase amount of the PB. [Reference numerals] (2305) Downlink receiving unit; (2310) Trigger blocking unit; (2315) Excessive power report generating unit; (2320) Uplink transmitting unit; (2355) RRC setting unit; (2360) Scheduling unit; (2365) Downlink transmitting unit; (2370) Uplink receiving unit; (AA) Uplink grant, RRC message; (BB) Excessive power report

Description

Apparatus and method for reporting surplus power {APPARATUS AND METHOD FOR PERFORMING POWER HEADROOM REPORT}

The present invention relates to wireless communication, and more particularly, to an apparatus and method for performing surplus power reporting in a wireless communication system supporting a plurality of CCs.

One way for the base station to efficiently utilize the resources of the terminal is to use the power headroom 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. When the terminal provides surplus power information to the base station, the base station may estimate how much uplink maximum transmission power that the terminal can afford. Accordingly, the base station may be configured such that uplink such as transmit power control (TPC), modulation and coding scheme (MCS), bandwidth, and the like within a range of the estimated uplink maximum transmit power. Link scheduling may be provided to the terminal.

When transmission based on different communication bases occurs at the same time at the terminal, power management is required because uplink power consumption is larger than when transmission based on any one communication base occurs. Power backoff for power management further reduces the maximum power of the uplink of the terminal. Accordingly, it is necessary to report surplus power according to additional maximum power reduction (MPR).

The present specification provides an apparatus and method for performing surplus power reporting in a wireless communication system.

In addition, the present specification provides an apparatus and method for performing surplus power reporting in a wireless communication system supporting a plurality of CCs.

In addition, the present disclosure provides an apparatus and method for triggering a surplus power report in accordance with a change in power backoff in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for triggering a surplus power report by a plurality of shutdown timers in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for controlling the blocking of the shutdown timer in consideration of an increase amount of power backoff (PB) for the terminal in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for performing a surplus power report in consideration of the increase amount of the power backoff (PB) for the terminal in a wireless communication system.

According to an aspect of the present invention, a terminal performing a power headroom report (PHR) includes an amount of change in a pathloss (PL) for a serving cell configured in the terminal and a power back for the terminal. An increase amount of power backoff (PB) or a decrease amount of PB for the terminal and a first prohibit timer used to block a trigger of the PHR, and a first based on the change amount of the PL Generate or block at least one of a trigger of a PHR and a trigger of a second PHR based on a decrease amount of the PB based on a state of the first shutdown timer, or generate a trigger of a third PHR based on an increase amount of the PB. A trigger blocker to shut off the battery; A downlink receiving unit configured to receive an uplink grant from a base station for allocating a resource used to transmit a PHR; A surplus power report generation unit for generating a medium access control (MAC) message including the PHR; And an uplink transmitter for transmitting the MAC message to the base station.

According to another aspect of the present invention, a method of performing a surplus power report (PHR) by a terminal includes a change amount of a path loss for a serving cell set in a terminal, an increase amount of a power backoff (PB) for the terminal, or the Measuring a decrease amount of the PB for the terminal and a first cutoff timer used to block the trigger of the PHR; A control procedure for generating or blocking at least one of the trigger of the first PHR based on the change amount of the PL and the trigger of the second PHR based on the decrease amount of the PB based on the state of the first shutdown timer or the increase amount of the PB. Performing a control procedure of generating or blocking a trigger of the third PHR based on the method; Receiving an uplink grant from the base station that allocates resources used to transmit the PHR; Generating a embedded access control (MAC) message including the PHR; And transmitting the MAC message to the base station.

According to the present invention, since the interlocking operation between the trigger of the surplus power report based on the power backoff and the trigger of the surplus power report based on the path loss is clearly defined, uplink power control can be efficiently performed. In addition, since the number of transmissions of the surplus power report is properly adjusted, overhead can be reduced.

1 shows a wireless communication system to which the present invention is applied.
2 is an explanatory diagram illustrating the same intra-band contiguous carrier aggregation in a wireless communication system to which the present invention is applied.
3 is an explanatory diagram illustrating the same in-band non-contiguous carrier aggregation in a wireless communication system to which the present invention is applied.
4 is an explanatory diagram illustrating inter-band carrier aggregation in a wireless communication system to which the present invention is applied.
5 shows a linkage between a downlink component carrier and an uplink component carrier in a wireless communication system to which the present invention is applied.
6 is an example of a graph showing surplus power on the time-frequency axis to which the present invention is applied.
7 is a conceptual diagram illustrating an effect of uplink scheduling of a base station on transmission power of a terminal in a wireless communication system.
8 is an explanatory diagram illustrating a power adjustment amount and a maximum transmission power in a multi-element carrier system according to an embodiment of the present invention.
FIG. 9 is an explanatory diagram showing a state in which a power backoff caused by 1xRTT to which the present invention is applied and a path loss measured by an LTE receiver change with time.
Fig. 10 shows the change in the maximum transmission power Pcmax when the amount of change in PMPR is larger than the threshold.
11 is an explanatory diagram illustrating a trigger of surplus power report according to an embodiment of the present invention.
12 is an explanatory diagram illustrating a trigger of surplus power report according to another example of the present invention.
13 is an explanatory diagram illustrating a trigger of surplus power report according to another example of the present invention.
14 is an explanatory diagram illustrating a trigger of surplus power report according to another example of the present invention.
15 is an explanatory diagram illustrating a trigger of surplus power report according to another example of the present invention.
FIG. 16 is an explanatory diagram illustrating an embodiment in which surplus power reporting is triggered based on a plurality of shutdown timers according to the present invention.
17 is a flowchart illustrating a method of performing a surplus power report of a terminal according to an embodiment of the present invention.
18 is a flowchart illustrating a method of performing a surplus power report of a terminal according to another embodiment of the present invention.
19 is a flowchart illustrating a method of performing a surplus power report of a terminal according to another embodiment of the present invention.
20 is a flowchart illustrating a method of performing a surplus power report of a terminal according to another embodiment of the present invention.
21 is a flowchart illustrating a method of performing a surplus power report of a terminal according to another embodiment of the present invention.
22 is a flowchart illustrating a method of performing a surplus power report of a base station according to an embodiment of the present invention.
23 is a block diagram showing a terminal and a base station for performing a surplus power report 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 describing the components of the present specification, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the components from other components, and the essence of the components is not limited in order or order by the terms. When 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 specification describes a wireless communication network, the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting data in a system (for example, a base station) that is in charge of the wireless communication network, Work may be done at the terminal coupled to the network.

1 shows a wireless communication system.

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

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

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

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

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

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

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

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

The Physical Layer, which is the first layer, is connected to the upper Media Access Control (MAC) layer through a transport channel, and the transport layer between the MAC and the physical layer through this transport channel. The data moves. In addition, data is moved between different physical layers, that is, between physical layers of a transmitting side and a receiving side through a physical channel. There are several physical control channels used in the physical layer.

A physical downlink control channel (PDCCH) for transmitting physical control information is a HARQ (hybrid automatic repeat) associated with a resource allocation of a paging channel (PCH) and a downlink shared channel (DL-SCH) and DL-SCH to a UE. request) Provides information. The PDCCH may have an uplink grant informing the UE of resource allocation of uplink transmission. A physical control format indicator channel (PCFICH) informs the UE of the number of OFDM symbols used for PDCCHs and is transmitted every subframe. The Physical Hybrid ARQ Indicator Channel (PHICH) carries HARQ ACK / NAK signals 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) refers to an uplink shared channel (UL-SCH).

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

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

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

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

Carrier aggregation (CA) supports a plurality of component carriers and is also called 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 25 MHz may be supported.

CCs may be classified into primary CCs (hereinafter referred to as PCCs) and secondary CCs (hereinafter referred to as SCCs) according to activation. PCC is always active carrier, SCC is a carrier that is activated / deactivated according to a specific condition. Activation means that transmission or reception of traffic data is done or in a standby state. Deactivation means that transmission or reception of traffic data is not possible and that the measurement is capable of transmitting / receiving minimal information. The terminal may use only the lower PCC, or may use the lower or more SCCs together with the PCC. The terminal may be assigned a PCC and / or SCC from the base station.

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 collected in aggregate.

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

Referring to FIG. 5, in downlink, downlink component carriers (hereinafter, referred to as DL CCs) D1, D2, and D3 are aggregated, and in uplink, uplink component carriers (hereinafter, referred to as UL CCs) U1, U2, and U3 are represented. Are concentrated. Where Di is an index of DL CC and Ui is an index of UL CC (i = 1, 2, 3). At least the lower DL CC is PCC and the merge is SCC. Similarly, at least the lower UL CC is PCC and the merge is SCC. For example, D1 and U1 are PCCs, and D2, U2, D3, and U3 are SCCs.

In the FDD system, DL CC and UL CC are connected to each other, D1 is connected to U1, D2 is connected to U2, and D3 is connected to U3. The UE establishes a connection between the DL CCs and the UL CCs through system information transmitted by a logical channel BCCH (Broadcast Control Channel) or a dedicated RRC message transmitted by a dedicated control channel (DCCH). Each connection configuration may be set cell specific or UE specific.

5 illustrates only a connection configuration between a DL CC and an UL CC, as an example. Of course, a connection configuration of 1: n or n: 1 may also be established. In addition, the index of the component carrier does not correspond to the order of the component carrier or the position of the frequency band of the component carrier.

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

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

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

The reported surplus power can be given as the following table.

Reported value Measured quantity value (dB) POWER_HEADROOM_0 -23≤PH <-22 POWER_HEADROOM_1 -22≤PH <-21 POWER_HEADROOM_2 -21≤PH <-20 POWER_HEADROOM_3 -20≤PH <-19 POWER_HEADROOM_4 -19≤PH <-18 POWER_HEADROOM_5 -18≤PH <-17 ... ... POWER_HEADROOM_57 34≤PH <35 POWER_HEADROOM_58 35≤PH <36 POWER_HEADROOM_59 36≤PH <37 POWER_HEADROOM_60 37≤PH <38 POWER_HEADROOM_61 38≤PH <39 POWER_HEADROOM_62 39≤PH <40 POWER_HEADROOM_63 PH≥40

Referring to Table 1, surplus power is in the range of -23dB to + 40dB. If 6 bits are used to represent the surplus power, 2 ⁶ = 64 indexes can be represented. The surplus power is divided into 64 levels. For example, when the bit representing the surplus power 0 (that is, 6 bits, the other being an inner surface 000000) produce other that the surplus power -23≤P _PH ≤-22dB.

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

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

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

Surplus power P _PH may be referred to as power headroom, remaining power, or surplus power. That is, the merged 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 becomes the P _PH value.

As an example, P _estimated is equal to an estimated power P _{PUSCH for} transmission of a Physical Uplink Shared CHannel (PUSCH). Therefore, in this case, P _PH can be obtained by Equation 2.

As another example, P _estimated is equal to the sum of the power P _PUSCH estimated for the transmission of the _PUSCH and the power P _PUCCH estimated for the transmission of the Physical Uplink Control Channel (PUCCH). Therefore, in this case, the surplus power can be obtained by equation (3).

The surplus power according to Equation 3 is represented as a graph in the time-frequency axis as shown in FIG. This represents the surplus power for the lower CC.

Referring to FIG. 6, the set maximum transmission power P _cmax of the terminal is composed of P _PH 605, P _PUSCH 610, and P _PUCCH 615. In other words, the P _cmax in the near future, except for P _PUSCH (610) and P _PUCCH (615) power is defined as P _PH (605). Each power is calculated in units of a transmission time interval (TTI).

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

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

In a multi-component carrier system, surplus power may be individually defined for a plurality of configured CCs, which is represented as a graph in the time-frequency axis as shown in FIG. 7.

Whether a single component carrier system or a multi-component carrier system, the maximum transmit power set in the terminal is affected by the maximum power reduction (MPR) of the terminal. The maximum power reduction means to reduce the maximum transmission power set in the terminal within the allowable constant range, and the amount of power reduced by the maximum power reduction is referred to as the maximum power reduction amount.

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

Referring to FIG. 7, the terminal receives an uplink grant through the PDCCH that allows uplink data transmission from the base station at time (or subframe) t0. Therefore, the terminal should calculate the amount of transmission power according to the uplink grant at t0.

First, at time t0, the UE is weighted to the PUSCH power offset (700) value and the transmit power control (TPC, 705) value received from the base station and the path loss (PL) 710 between the base station and the terminal. The primary transmit power 725 is calculated in consideration of the value a (received from the base station). The first transmission power (1st Tx Power, 725) is mainly based on a parameter that is influenced by the path environment between the base station and the terminal and a parameter that is determined by the policy of the network. In addition, the UE considers the QPSK modulation included in the uplink grant and the scheduling parameter 715 indicating the allocation of 10 resource blocks (RBs). Calculate The secondary transmission power 730 is a transmission power that is changed through uplink scheduling of the base station.

Accordingly, the terminal may calculate the final uplink transmission power by adding both the primary transmission power 725 and the secondary transmission power 730. Here, the final uplink transmission power may not exceed the configured maximum UE transmit power (P _cmax ) of the configured UE. In the example of FIG. 7, since the final transmission power is smaller than the value of P _cmax at time t0, uplink information transmission according to a set parameter may be performed. In addition, there is a surplus power (power headroom) 720 which is a margin for additional transmission power. The surplus power 720 is transmitted by the terminal to the base station according to a rule determined by the wireless communication system.

At time t1, the base station changes to a scheduling parameter 750 indicating allocation of 16QAM modulation scheme and 50 resource blocks in consideration of the transmission power that can be additionally set to the terminal through the information of the surplus power 720. The terminal resets the secondary transmit power 765 according to the scheduling parameter 750. The primary transmit power 760 at t1 is a PUSCH power offset (735) value and a transmit power control (TPC) 740 value and a value that is weighted to the PL 745 between the base station and the terminal (received from the base station). It is determined in consideration of the above, and assumes the same as the primary transmission power 725 at t0.

The time t1, P _cmax the other hand there is changed to a value close to P _{cmax_L,} the sum of the second transmission power (765) and the first transmission power 760 required by the scheduling parameters 750 exceeds the P _cmax. That is, P -P _{cmax_H} surplus power estimate of error by _cmax; occurs (PH estimation error 755). As described above, when the scheduling for the uplink resource is performed based only on the surplus power information, the terminal cannot set uplink transmission power expected by the base station, and thus performance degradation occurs. When using the component carrier aggregation scheme, the surplus power estimate error 755 becomes larger. Therefore, the terminal should reduce the set maximum transmission power.

The maximum transmission power of the terminal in consideration of the maximum power reduction is as follows.

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

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

Maximum power reduction can be set to a specific range or a specific constant. The maximum power reduction may be defined in units of terminals, or may be defined in units of CCs, and may be set as a range or a constant in each unit of CCs. In addition, the maximum power reduction may be set to a range or a constant depending on whether the PUSCH resource allocation of each CC is continuous or discontinuous. The maximum power reduction may be set to a range or a constant depending on whether the PUCCH is present.

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

Referring to Figure 8, when assumed that △ T _C = 0, the maximum value (P _cmax- H) of the maximum transmission power (P _cmax) may be 23dBm corresponding to the power class 3. The minimum value _{(P-L cmax)} of the maximum transmission power (P _cmax) is a value obtained by subtracting the maximum value of the maximum power reduction (MPR, 800) and an additional maximum power reduction (AMPR, 805) in (P _cmax-H). That is, the terminal reduces the minimum value P _cmax-L of the maximum transmission power P _cmax by using the maximum power reduction amount 800 and the additional maximum power reduction amount 805. The maximum transmit power P _cmax is determined between the maximum value P _cmax-H and the minimum value P _cmax-L .

Meanwhile, the uplink transmission power 830 may include a bandwidth (BW), a modulation and coding scheme (MCS), a power 815 determined by the RB, a path loss (PL, 820), and a PUSCH transmission power control (PUSCH TPCs). 825). Surplus power (PH, 810) is the maximum transmission power (P _cmax ) minus the uplink transmission power (830).

In FIG. 8, only the following UL CCs are described. When a plurality of UL CCs are allocated, the maximum transmit power will be given in units of terminals rather than in units of UL CCs, and the maximum transmit power of each unit is the maximum of all UL CCs. It can be given as the sum of the transmit powers.

In calculating the maximum transmission power, P _Emax , ΔT _C , P _powerclass , and additional maximum power reduction amount are information known to the base station. However, since the base station does not know the maximum power reduction amount, it is also impossible to know the maximum transmission power according to the maximum power reduction amount. However, when the terminal reports the surplus power to the base station, the base station can only estimate the extent of the maximum transmission power through the surplus power. Since the base station performs uncertain uplink scheduling within the estimated maximum transmit power, the base station may schedule the modulation / channel bandwidth / RB that requires a transmit power of the maximum transmit power or more for the terminal.

As described above, the surplus power reporting procedure is used to provide the serving base station with information about the difference between the estimated power for the uplink data transmission for each active serving cell and the nominal maximum transmit power of the terminal. do. In addition, the surplus power reporting procedure is also used to provide information about the difference between the estimated power for uplink data transmission and PUCCH transmission for the primary serving cell and the rated maximum transmit power of the terminal.

Trigger conditions must be met for surplus power reporting to be triggered. Trigger requirements are also called events. Parameters related to trigger requirements include pathloss variation, power backoff variation and various timers. These parameters define trigger requirements in association with each other or independently.

1. Power backoff

Power backoff refers to a maximum power reduction additionally generated by power management in uplink. When transmission based on different communication bases occurs at the same time at the terminal, power management is required because uplink power consumption is larger than when transmission based on any one communication base occurs. As an example of the case where power management is required, in the case of simultaneous transmission of packet switching and circuit switching, non-voice data and voice data can be simultaneously transmitted. For example, simultaneous transmission of LTE-based data and 1x-Evolution-Data Optimized (1x-EVDO) (or 1xRTT (Radio Transmission Technology))-based data, or a case of considering a specific absorption rate (SAR) may be considered. Off is also called PMPR (or P-MPR).

Power backoff is a variable that determines the maximum transmit power P _cmax configured in the terminal. As an example, when considering the power backoff, Equation 5 may be modified as Equation 7.

Referring to Equation 7, PMPR is a power backoff value. P cmax _-L is determined by the higher of MPR + AMPR and PMPR. That is, MPR + AMPR and PMPR are incompatible with each other, and maximum power reduction may be independently performed by PMPR itself. For example, if PMPR> MPR + AMPR in equation (7), PMPR is equated to MPR in equation (5) by itself.

As another example, when considering the power backoff, Equation 5 may be modified as Equation 8.

According to Equation 8, P cmax _-L is calculated by all of MPR, AMPR, and PMPR. That is, MPR, AMPR, and PMPR are compatible with each other, and they together affect P _cmax-L . The PMPR of Equation 8 is an additional MPR generated by power management, which is different from the pure MPR defined in Equation 5.

Comparing the definition of the PMPR value according to Equation 7 and the PMPR value according to Equation 8, PMPR in Equation 7 refers to the power backoff value generated by 1xRTT, and PMPR in Equation 8 corresponds to 1xRTT. The power backoff value generated by the comparison with the pure MPR value defined in Equation (5) is large, the difference value is defined.

For example, if the pure MPR value defined in Equation 5 is 8 dB and the power backoff value expected by 1xRTT is 7 dB, the PMPR value defined by Equation 7 will be 7 dB, and Equation 8 The PMPR value defined by is 0 dB. The PMPR value defined by Equation 8 is 0 dB because it does not have a small case.

As another example, if the pure MPR value is 8 dB and the power backoff value by 1xRTT is 10 dB, the PMPR value defined by Equation 7 is 10 dB, and the PMPR value defined by Equation 8 is 2 dB (= 10dB-8dB).

As described in Equations 7 and 8, the maximum transmission power P _cmax is changed by the power backoff. If the maximum transmit power P _cmax is changed, the surplus power also changes as a result. That is, the power backoff affects the change of surplus power, and the power backoff change is used to define the trigger requirement along with the pathloss change. That is, the trigger of the surplus power report may occur based on the power backoff or may occur based on the path loss. For example, the trigger requirement may include that the change in power backoff is greater than the power backoff threshold, where the increase in power backoff is greater than the power backoff threshold and the decrease in power backoff is greater than the power backoff threshold. There is a big case. Further, the trigger requirement may include that the amount of change in path loss is greater than the path loss threshold.

Power backoff and path loss have different characteristics. FIG. 9 is an explanatory diagram showing a state in which a power backoff caused by 1xRTT and a path loss measured by an LTE receiver change with time.

Here, 1xRTT means a circuit based communication system and includes CDMA 2000 or WCDMA communication. That is, it may include other communication systems that are distinguished from the LTE system.

Referring to FIG. 9, power backoff by 1 × RTT occurs regardless of channel change. In addition, the path loss changes slowly in units of 200ms, but the change in power backoff by 1xRTT changes relatively rapidly in units of 20ms.

Meanwhile, the maximum power reduction (MPR) is generated by the terminal according to a method of allocating resources in an LTE uplink grant or a modulation. Therefore, the maximum power reduction may be equally applied to an uplink grant in which the resource allocation scheme has the same modulation. However, power backoff by 1xRTT occurs separately from the LTE uplink grant, and a change occurs rapidly depending on whether 1xRTT data transmission occurs simultaneously with LTE transmission.

Thus, if the maximum transmission power P _cmax changes due to the power back off, the surplus power also changes accordingly. However, since the change in surplus power due to the power back-off changes rapidly, sending the surplus power report every time may act as an overhead due to frequent transmission. In addition, the overhead can be even greater because redundant power reporting can occur based on other causes such as path loss as well as power backoff. Therefore, in order to efficiently perform uplink power control, a method of appropriately triggering surplus power reporting according to a change in power backoff is required. For this purpose, a trigger requirement of a different type from the trigger requirement defined based on the path loss must be defined. In addition, a clear procedure for operation when pathloss-based trigger requirements are interlocked with other types of trigger requirements is required.

Figure 10 tanaen the maximum change in the transmit power P _cmax of a case in which the amount of change in PMPR greater than a threshold.

If the value of PMPR changing the power back-off process, the P value _cmax changed to interfere with the uplink scheduling base station. When the PMPR is changed during the power backoff process, there are cases where PMPR increases (S1010) and PMPR decreases (S1020).

In particular, when the PMPR increases (S1010), a power attenuation phenomenon occurs in the uplink transmission of the UE, which is particularly problematic. Here, the power attenuation phenomenon is, the base station performs the uplink scheduling and expects a P _cmax value incorrectly, and thus the required transmit power to the mobile station becomes larger than P _cmax value with increasing values of PMPR by P _cmax value decreases The actual transmission power of the terminal means a phenomenon that becomes smaller within the P _cmax value.

As such, when a power attenuation occurs in uplink transmission of the terminal due to incorrect scheduling of the base station, the receiving end of the base station will receive less power than the expected reception power at the time of scheduling, and the performance of the uplink may be degraded. have.

If the PMPR is reduced (S1020), there is a problem in that the terminal does not fully utilize the transmission power possessed. Although uplink scheduling is inefficient, it does not cause serious performance degradation problems such as power attenuation.

Therefore, in order to efficiently report surplus power when the PMPR increases, it is required to adjust the surplus power reporting trigger requirement so that the surplus power reporting trigger due to the PMPR increase is well transmitted at the corresponding time point. It is necessary to report surplus power separately from the case where PMPR increases.

Hereinafter, the case in which the surplus power report is reported by increasing the PMPR value by more than the threshold value (S1010) is called surplus power reporting based on the power backoff according to the PMPR increase, and the surplus power report is reported by reducing the PMPR value by the threshold value or more (S1020). ) Is called surplus power reporting based on power backoff following PMPR reduction. At this time, the threshold when the PMPR value increases and the threshold when decreasing may be the same or different. In the following, it is assumed to be the same and only expressed as a threshold. Therefore, the increase or decrease amount of PMPR, that is, the absolute value of the change amount is compared with the threshold value.

2. Timer

The timer is a factor in defining the trigger requirement. The timer controls the trigger of the surplus power report along with the path loss variation and the power backoff variation. The timer includes a periodic surplus power report timer (hereinafter referred to as a "periodic timer") and a blocking surplus power report timer (hereinafter referred to as a "blocking timer"). The periodic timer is a timer that controls the surplus power report to be triggered periodically. The cutoff timer is a timer that cuts off the trigger of the surplus power report.

The periodic timer is a PHR MAC that includes a subheader when an uplink resource for a new transmission is allocated to a terminal at a current transmission time interval (TTI) or the allocated uplink resource is a result of logical channel priority. If it can accept a control element, it can be started (or started) or restarted (or restarted). Alternatively, the periodic timer may be restarted when a trigger of the surplus power report based on any of pathloss and power backoff occurs. Periodic timers expire after a period of time after they have been started or restarted.

The values of the periodic timer and the cutoff timer may be expressed by the number of subframes. For example, if the value of the periodic timer is 10, this corresponds to 10 subframes. According to this, the UE reports the surplus power every 10 subframes. On the other hand, if the value of the cutoff timer is 10, the trigger of the surplus power report is blocked for 10 subframes. If the cutoff timer expires after the 10 subframes have elapsed, there is a chance that the surplus power report is triggered.

The setting of the periodic timer and the shutoff timer may be controlled by the RRC layer. As an example, the base station may transmit an RRC message such as the MAC-MainConfig information element of Table 2 to the terminal. Table 2 shows two disconnect timers.

Referring to Table 2, the RRC message includes a periodic PHR-Timer value and a cutoff timer value. There are two types of cutoff timers: a primary prohibit PHR timer and a secondary prohibit PHR timer. Alternatively, the first blocking timer may be referred to as a second blocking timer. The value sfn of the sleep timer means that the sleep timer operates for n subframes.

The first cutoff timer may block the trigger of the surplus power report based on all causes except the trigger of the surplus power report based on the power backoff according to the PMPR increase. For example, the first cutoff timer blocks not only the trigger of the surplus power report based on the power backoff due to the PMPR reduction but also the trigger of the surplus power report based on the path loss. However, triggering of surplus power reporting based on power backoff due to PMPR increase cannot be blocked. As described above, when PMPR increases, there is a possibility of performance deterioration due to a power attenuation phenomenon, which has a high priority for surplus power reporting. On the other hand, the second cutoff timer blocks only the trigger of the surplus power report based on the power backoff. For example, the second shutdown timer may trigger the trigger of the surplus power report based on the power backoff or the surplus power report based on the power backoff based on the PMPR increase or the trigger of the surplus power report based on the PMPR decrease. Block it. However, the trigger of surplus power reporting based on path loss is not blocked.

 Therefore, when the first shutdown timer does not expire and the second shutdown timer expires, surplus power reporting based on power backoff due to PMPR increase may be triggered, and surplus power reporting or path based on power backoff due to PMPR reduction may be triggered. Loss-based surplus power reporting is not triggered. On the other hand, when the first shutdown timer expires and the second shutdown timer does not expire, surplus power reporting based on power backoff due to an increase in PMPR or a decrease in PMPR is not triggered, and surplus power reporting based on path loss may be triggered. have. Accordingly, the triggering of the surplus power report based on the power backoff according to the PMPR reduction may be performed only when both the first shutdown timer and the second shutdown timer expire.

The time point for restarting after the first shutdown timer and the second shutdown timer expires may vary.

As an example, if a surplus power report based on a cause is transmitted, both the first shutdown timer and the second shutdown timer are restarted. For example, the transmission of the surplus power report based on the path loss restarts the second cutoff timer as well as the first cutoff timer. On the other hand, the transmission of the surplus power report based on the power backoff according to the PMPR increase or PMPR decrease restarts only the second cutoff timer and does not restart the first cutoff timer.

As another example, surplus power reporting based on a particular cause may restart a particular shutdown timer. For example, the transmission of the surplus power report based on the path loss restarts only the first shutdown timer, and the transmission of the surplus power report based on the power backoff according to the PMPR increase or PMPR decrease restarts only the second shutdown timer.

As another example, the transmission of the surplus power report based on the path loss restarts both the first shutdown timer and the second shutdown timer, and also the transmission of the surplus power report based on the power backoff according to the increase or decrease of PMPR. Both the timer and the second cutoff timer can be restarted.

As another example, the transmission of the surplus power report based on the path loss restarts only the first shutdown timer, and the transmission of the surplus power report based on the power backoff according to the PMPR increase or the PMPR decrease may include the first shutdown timer and the second shutdown timer. You can restart all of them.

In Table 2, two types of cutoff timers are described. This is merely an example, and three or more cutoff timers may be provided. In this case, two other cutoff timers may be cut off at the bottom cutoff timer.

On the other hand, the setting of the periodic timer and the cutoff timer is another example controlled by the RRC layer, the base station may transmit an RRC message such as the MAC-MainConfig information element of Table 3 to the terminal. Table 3 shows a case where there is one shutdown timer.

Referring to Table 3, the RRC message includes a periodic timer value and a cutoff timer value. The shutdown timer is one, and the trigger of the surplus power report based on all causes except the surplus power report based on the power backoff according to the PMPR increase can be blocked. That is, the cutoff timer blocks all triggers of surplus power reporting based on power backoff based on PMPR reduction and surplus power reporting based on path loss except for surplus power reporting based on power backoff due to PMPR increase. The cutoff timer expires when n subframes have elapsed by sfn, and the cutoff timer is restarted when a surplus power report based on some cause is transmitted. If the shutdown timer expires before restarting, it is said to reset the shutdown timer. Reset and restart differ only in that the start time is before or after the shutdown timer expires, and the time expires when the shutdown timer is reset or restarted.

3. Trigger of surplus power reporting

The surplus power report is triggered when the trigger requirement is met. Factors that define trigger requirements include power backoff variations (increase or decrease), pathloss variations, and timers, as described above. These elements are related to each other to define trigger requirements. Basically, in order for the surplus power report to be triggered, it is required that the power backoff reduction is greater than the threshold, the periodic timer expires, the path loss variation is greater than the threshold, and the cutoff timer expires. The exception is that the power backoff increase is greater than the threshold. Hereinafter, a trigger requirement for triggering a surplus power report will be described. The case where there is one shutdown timer as shown in Table 3 and a plurality of cases as shown in Table 2 will be described. In particular, when there is one cutoff timer, the redundant power report based on the power backoff according to the PMPR increase is transmitted and the cutoff timer is restarted. Otherwise, only the expired cutoff timer is restarted.

In addition, when the periodic timer expires, the same requirements as in the case where the change amount of the path loss is larger than the path loss threshold are configured. Therefore, the same result is obtained by substituting the case where the periodic timer expires when the path loss change amount is larger than the path loss threshold.

(1) When there is only one shutdown timer, and the shutdown timer does not restart after reporting surplus power based on power backoff due to PMPR increase.

As an example, the surplus power report may be triggered when the periodic timer expires.

As another example, the surplus power report may be triggered when the shutdown timer expires, the periodic timer expires, or the pathloss change is greater than the pathloss threshold.

As another example, the surplus power report may be triggered when the shutdown timer expires and the power backoff reduction amount is greater than the power backoff threshold.

As another example, surplus power reporting may be triggered when the power backoff increase is greater than the power backoff threshold. At this time, the surplus power report may be triggered before the shutdown timer expires.

11 is an explanatory diagram illustrating a trigger of surplus power report according to an embodiment of the present invention. This is a case where there is one shutdown timer, and the shutdown timer does not restart after reporting surplus power based on power backoff due to PMPR increase.

Referring to FIG. 11, a trigger of PHR triggering by PL based on path loss and a trigger of surplus power based on power backoff (PB) are controlled by one blocking timer. Surplus power reporting based on power backoff includes PHR triggering by PMPR up based on power backoff as PMPR increases and PHR triggering by PMPR down based on power backoff due to PMPR reduction. . As time passes, B1 to B5, which are the time points at which the reduction of the power backoff becomes larger than the power backoff threshold, occur relatively more frequently than A1, A2, and A3, which are the time points at which the change in the path loss becomes larger than the path loss threshold.

In principle, two trigger requirements must be met for surplus power reporting to be triggered. First, when the periodic timer expires, the amount of change in path loss becomes greater than the path loss threshold, and the amount of decrease in power backoff is greater than the power back off threshold, the requirement 1 of PHR triggering is satisfied.

When the shutdown timer expires, the requirement 2 of the surplus power reporting trigger is satisfied. When both Requirements 1 and 2 are met, the surplus power report is triggered and the transmission of the surplus power report occurs.

As such, if the increase in power backoff is greater than the power backoff threshold, it will trigger surplus power reporting even before the shutdown timer expires. This is called requirement 3. If requirement 3 is met, the surplus power reporting trigger requirement is met even if requirement 1 or 2 is not met. The reason is that if the increase amount of the power backoff is greater than the power backoff threshold, power attenuation may occur, resulting in performance degradation. Even when the surplus power report is sent shortly after satisfying the trigger requirement, the surplus power report is transmitted again to prevent power attenuation.

At time A1, the periodic timer expires or the path loss change is greater than the path loss threshold (PHR triggering by PL), which satisfies Requirement 1, and does not meet Requirement 2 since the cutoff timer expires. Similarly, at the time points B1 and B2, the reduction amount of the power backoff is greater than the threshold value of the power backoff, which satisfies the requirement 1, and does not satisfy the requirement 2 since the cutoff timer expires. Therefore, the surplus power report is not triggered at the points A1, B1, and B2.

Next, since requirement 1 and requirement 2 are satisfied at time A2, surplus power report is triggered, and transmission of surplus power report (PHR Tx) occurs. Since the transmission of the surplus power report has occurred in accordance with Requirement 1 and Requirement 2, the shutdown timer is restarted at this point. At time B3, after the shutdown timer is restarted but before expiration, surplus power reporting is not triggered because requirement 1 is still met but requirement 2 is still not met.

However, at the time C1, the increase amount of the power backoff is larger than the threshold value of the power backoff to satisfy the requirement 3. If requirement 3 is met, the surplus power report is triggered (PHR triggering by PMPR up) even before the shutdown timer expires (ie, does not meet requirement 2), and the transmission of surplus power report (PHR Tx) occurs. However, if surplus power reporting is triggered by satisfying requirement 3, the shutdown timer does not reset or restart.

After the shutdown timer expires, since both requirements 1 and 2 are satisfied at time B4, the surplus power report is triggered, and transmission of the surplus power report occurs. Since the transmission of the surplus power report has occurred in accordance with Requirement 1 and Requirement 2, the shutdown timer is restarted at this point.

At A3 and B5, the requirement 1 is met and the requirement 2 is not met, and the surplus power report is not triggered by the interrupt timer.

However, since the requirement 3 is satisfied at the time C2, the surplus power report is triggered even if the requirement 2 is not satisfied, and transmission of the surplus power report (PHR Tx) occurs. In the case of the C2 time, the interrupt timer does not reset or restart because the surplus power report is triggered by satisfying the requirement 3 as in the C1 time.

At the C3 time point, since the requirement 3 is satisfied as in the C1 time point or the C2 time point, the surplus power report is triggered, and the surplus power report transmission (PHR Tx) occurs. The shutdown timer does not reset or restart because surplus power reporting has been triggered by meeting requirement 3. Therefore, the start of the cutoff timer does not occur.

As such, when the shutdown timer controls the trigger of the surplus power report due to various causes at once, the overhead caused by the frequent surplus power report can be reduced as much as possible, and the trigger procedure of the surplus power report can be clarified. In addition, it helps to inform the base station of the change in the PMPR increase. Transmission of surplus power report due to changes in PMPR increase (PHR Tx) does not restart the shutdown timer, thus preventing the triggering of the surplus power report by the change amount of periodic timer path loss unintentionally blocked by the shutdown timer. . In FIG. 11, it is described that the trigger of the surplus power report and the transmission of the surplus power report occur simultaneously for convenience. This is only an example, and the trigger of the surplus power report and the transmission of the surplus power report may occur at different time points.

(2) When there is only one shutdown timer, and the shutdown timer is reset or restarted after reporting surplus power based on power backoff due to PMPR increase.

As an example, the surplus power report may be triggered when the periodic timer expires.

As another example, the surplus power report may be triggered when the shutdown timer expires, the periodic timer expires, or the pathloss change is greater than the pathloss threshold.

As another example, the surplus power report may be triggered when the shutdown timer expires and the power backoff reduction amount is greater than the power backoff threshold.

As another example, surplus power reporting may be triggered when the power backoff increase is greater than the power backoff threshold. At this time, the surplus power report may be triggered before the shutdown timer expires.

12 is an explanatory diagram illustrating a trigger of surplus power report according to an embodiment of the present invention. This is a case where there is one shutdown timer, and the shutdown timer is reset or restarted after the surplus power is reported based on the power backoff according to the PMPR increase.

Referring to FIG. 12, the trigger of the PHR triggering by PL based on the expiration or the path loss of the periodic timer and the trigger of the surplus power based on the power backoff (PB) are generated by one shutdown timer. Controlled. Surplus power reporting based on power backoff includes PHR triggering by PMPR up based on power backoff as PMPR increases and PHR triggering by PMPR down based on power backoff due to PMPR reduction. . As time passes, B1 to B6, which is the point where the decrease of the power backoff becomes larger than the power backoff threshold, occur relatively more frequently than A1, A2, and A3, when the change in the path loss becomes larger than the path loss threshold.

In principle, two trigger requirements must be met for surplus power reporting to be triggered. First, when the periodic timer expires, the change amount of the path loss becomes greater than the path loss threshold, and the decrease amount of the power backoff exceeds the power back off threshold, the requirement 1 of the surplus power reporting trigger is satisfied. When the shutdown timer expires, the requirement 2 of the surplus power reporting trigger is satisfied. When both Requirements 1 and 2 are met, the surplus power report is triggered and the transmission of the surplus power report occurs.

As such, when the increase amount of the power backoff is greater than the power backoff threshold and satisfies the requirement 3 of the surplus power reporting trigger, the surplus power reporting is triggered even before the shutdown timer expires. This is to prevent power deterioration and performance degradation when the increase amount of the power backoff exceeds the power backoff threshold.

Comparing the example of FIG. 12 with the example of FIG. 11, the transmission of the trigger and surplus power report according to Requirements 1 to 3 is the same. When the surplus power report is transmitted when the requirement 3 is satisfied, the shutdown timer is reset. Or restart.

At time A1, the periodic timer expires or the pathloss change is greater than the pathloss threshold, which satisfies Requirement 1, and does not meet Requirement 2, since the cutoff timer expires. Similarly, at the time points B1 and B2, the reduction amount of the power backoff is greater than the threshold value of the power backoff, which satisfies the requirement 1, and does not satisfy the requirement 2 since the cutoff timer expires. Therefore, the surplus power report is not triggered at the points A1, B1, and B2.

Next, since requirement 1 and requirement 2 are satisfied at time A2, surplus power report is triggered, and transmission of surplus power report (PHR Tx) occurs. Since the transmission of the surplus power report has occurred, the cutoff timer restarts at this point. At time B3, after the shutdown timer is restarted but before expiration, surplus power reporting is not triggered because requirement 1 is still met but requirement 2 is still not met.

At C1, the increase in power backoff is greater than the threshold for power backoff to meet requirement 3. If requirement 3 is met, surplus power reporting is triggered (PHR triggering by PMPR up) even before the shutdown timer expires (even if requirement 2 is not met) and transmission of surplus power reporting (PHR Tx) occurs. Unlike the embodiment of FIG. 11, in the embodiment of FIG. 12, even when surplus power reporting is triggered by satisfying requirement 3, the shutdown timer is reset or restarted.

Requirement 1 is satisfied at time B4, but since the shut down timer restarted at time C1 has not yet expired, requirement 2 is not satisfied, so surplus power reporting is not triggered.

At B5, both requirements 1 and 2 are met, so the surplus power report is triggered (PHR triggering by PMPR down), and the surplus power report is sent. Since the transmission of the surplus power report has occurred, the cutoff timer restarts at this point.

At A3 and B6, the requirement 1 is satisfied and the requirement 2 is not met, and the surplus power report is not triggered by the interrupt timer.

As such, when the shutdown timer controls the trigger of the surplus power report due to various causes at once, the overhead caused by the frequent surplus power report can be reduced as much as possible, and the trigger procedure of the surplus power report can be clarified. In particular, the overhead can be further reduced by sending a surplus power report according to requirement 3 and restarting the shutdown timer. In addition, the reset operation of the cutoff timer is consistent with the transmission of the surplus power report (PHR Tx), thereby preventing the operation of the cutoff timer from being complicated. In FIG. 12, the triggering of the surplus power report and the transmission of the surplus power report occur simultaneously for convenience. This is only an example, and the trigger of the surplus power report and the transmission of the surplus power report may occur at different time points.

(3) When there is only one shutdown timer and surplus power reporting based on power backoff due to PMPR increase, restart only the expired shutdown timer.

As an example, the surplus power report may be triggered when the periodic timer expires.

As another example, the surplus power report may be triggered when the shutdown timer expires, the periodic timer expires, or the pathloss change is greater than the pathloss threshold.

As another example, the surplus power report may be triggered when the shutdown timer expires and the power backoff reduction amount is greater than the power backoff threshold.

As another example, the surplus power report may be triggered if the shutdown timer has not expired but the power backoff increase is greater than the power backoff threshold.

13 is an explanatory diagram illustrating a trigger of surplus power report according to an embodiment of the present invention. This means that if there is one shutdown timer and surplus power reporting based on power backoff due to PMPR increase, only the expired shutdown timer is restarted.

Referring to FIG. 13, the trigger of PHR triggering by PL based on the expiration or path loss of a periodic timer and the trigger of PHR triggering by PB based on power backoff (PB) It is controlled by one shutdown timer.

Requirements 1 to 3, which are requirements for which surplus power reporting is triggered, are the same as in cases (1) and (2). In principle, surplus power reporting is triggered if requirements 1 and 2 are met simultaneously, and surplus power reporting is triggered only if requirement 3 is met.

Comparing the example of FIG. 13 with the example of FIGS. 11 and 12, the transmission of the trigger and the surplus power report according to the requirements 1 to 3 is the same, but expires when the surplus power report is transmitted by satisfying the requirement 3. The only difference is that the restarted timer is restarted.

At time A1, the periodic timer expires or the pathloss change is greater than the pathloss threshold, which satisfies Requirement 1, and does not meet Requirement 2, since the cutoff timer expires. Similarly, at the time points B1 and B2, the reduction amount of the power backoff is greater than the threshold value of the power backoff, which satisfies the requirement 1, and does not satisfy the requirement 2 since the cutoff timer expires. Therefore, the surplus power report is not triggered at the points A1, B1, and B2.

Next, since requirement 1 and requirement 2 are satisfied at time A2, surplus power report is triggered, and transmission of surplus power report (PHR Tx) occurs. Since the transmission of the surplus power report has occurred in accordance with Requirement 1 and Requirement 2, the shutdown timer is restarted at this point. At time B3, after the shutdown timer is restarted but before expiration, surplus power reporting is not triggered because requirement 1 is still met but requirement 2 is still not met.

Since the requirement 3 is satisfied at the time point C1, the surplus power report is triggered (PHR triggering by PMPR up) and the surplus power report transmission (PHR Tx) occurs even if the requirement 2 is not satisfied. Unlike the embodiment of FIG. 12, in the embodiment of FIG. 13, the requirement 3 is satisfied, but the interruption timer is not restarted since the interruption timer expires.

At B4, both requirements 1 and 2 are satisfied, so the surplus power report is triggered (PHR triggering by PMPR down), and the surplus power report transmission (PHR Tx) occurs. Since the transmission of the surplus power report has occurred, the cutoff timer restarts at this point.

At A3 and B5, Requirement 1 is not satisfied and Requirement 2 is not satisfied. The surplus power report is not triggered by the shutdown timer.

Since the requirement 3 is satisfied at the time of C2, the surplus power report is triggered even if the requirement 2 is not satisfied, and transmission of the surplus power report occurs. In the case of time C2, unlike the time C1, since the timeout timer has expired, the timeout timer is restarted.

In B6, the requirement 1 is satisfied and the requirement 2 is not met, and the surplus power report is not triggered by the interrupt timer.

As such, when the shutdown timer controls the trigger of the surplus power report due to various causes at once, the overhead caused by the frequent surplus power report can be reduced as much as possible, and the trigger procedure of the surplus power report can be clarified. In particular, the overhead can be further reduced by sending a surplus power report according to requirement 3 and restarting the shutdown timer. Transmission of surplus power report due to changes in PMPR increase (PHR Tx) does not restart the shutdown timer, thus preventing the triggering of the surplus power report by the change amount of periodic timer path loss unintentionally blocked by the shutdown timer. . In FIG. 13, the trigger of the surplus power report and the transmission of the surplus power report are simultaneously generated for convenience. This is merely an example.

(4) When there are multiple cutoff timers

The cutoff timer may be plural as shown in Table 2 above. The technical idea of an operation of interlocking two trigger timers, that is, a first shutdown timer and a second shutdown timer interlocking a trigger of surplus power report may be equally applied even when three or more shutdown timers exist.

As an example, the surplus power report may be triggered when the periodic timer expires.

As another example, the surplus power report may be triggered when the first shutdown timer expires, the periodic timer expires, or the pathloss change is greater than the pathloss threshold.

As another example, the surplus power report may be triggered when the power backoff reduction amount is greater than the power backoff threshold when the first shutdown timer expires or the second shutdown timer expires.

As another example, it may be triggered if the power backoff increase amount is greater than the power backoff threshold when the second shutdown timer expires.

In summary, the first cutoff timer blocks the trigger when the periodic timer expires or the path loss change amount is greater than the path loss threshold and the trigger when the power backoff decrease amount is greater than the power backoff threshold. The second cutoff timer also blocks a trigger when the power backoff increase is greater than the power backoff threshold and a trigger when the power backoff decrease is greater than the power backoff threshold.

The value of the first cutoff timer and the value of the second cutoff timer may be the same as or different from each other. When the value of the first cutoff timer and the value of the second cutoff timer are different from each other, the value of the first cutoff timer may be larger or smaller than the value of the second cutoff timer.

On the other hand, when the periodic timer expires or the surplus power report is transmitted by triggering the surplus power report when the path loss change amount is greater than the path loss threshold, both the first interrupt timer and the second interrupt timer can be restarted and the first interrupt timer You can only restart it. Hereinafter, a case in which both the first and second shutdown timers are restarted will be described with reference to FIG. 14, and a case where only the first shutdown timer is restarted will be described with reference to FIG. 15. Meanwhile, in both FIGS. 14 and 15, when the surplus power report is transmitted by triggering the surplus power report when the amount of power backoff increase is greater than the power backoff threshold and when the amount of power backoff decrease is greater than the power backoff threshold, the second power is transmitted. Restart only the shutdown timer.

14 is an explanatory diagram illustrating a trigger of surplus power report according to another example of the present invention. This means that the first shutdown timer and the second shutdown timer are reset or restarted together when there are two shutdown timers and the surplus power report is sent by triggering the surplus power report when the periodic timer expires or the path loss change is greater than the pathloss threshold. This is the case.

Referring to FIG. 14, a trigger of PHR triggering by PL based on the expiration or path loss of a periodic timer and PHR triggering by PB based on power backoff (PB) Controlled by two shutdown timers. Surplus power reporting based on power backoff includes PHR triggering by PMPR up based on power backoff as PMPR increases and PHR triggering by PMPR down based on power backoff due to PMPR reduction. .

In principle, two trigger requirements must be met for surplus power reporting to be triggered. First, when the periodic timer expires, the amount of change in path loss becomes greater than the path loss threshold, and the amount of decrease in power backoff is greater than the power back off threshold, the requirement 1 of PHR triggering is satisfied.

 The fulfillment of requirement 2 is interpreted differently depending on what caused the trigger. That is, a requirement 2 for the first shutdown timer to expire for the triggering of the surplus power report based on the expiration or the path loss of the periodic timer, and the first shutdown timer for the trigger for the surplus power reporting based on the power backoff due to PMPR reduction Requirement 2 is that both and second shutoff timer expire.

However, as an exception, the surplus power reporting trigger requirement is satisfied even when the increase amount of the power backoff is greater than the power backoff threshold. This is called requirement 3.

In the case of one cutoff timer, if the requirement 3 is satisfied, the surplus power report is triggered and transmitted without being cut off by the cutoff timer. However, when two cutoff timers are provided, it is assumed that the second cutoff timer expires even if the requirement 3 is satisfied.

In summary, if there are two shutdown timers, if requirement 1 is met, requirement 2 must also be met to trigger surplus power reporting. If requirement 3 is satisfied, requirement 2 must be satisfied to trigger surplus power reporting.

Judging whether the trigger requirement at each time point is satisfied is as follows.

First, at time A1, the periodic timer expires or the pathloss change becomes larger than the pathloss threshold to satisfy the requirement 1, and thus does not satisfy the requirement 2 since the first shutdown timer expires. Similarly, at the time points B1 and B2, the reduction amount of the power backoff is greater than the threshold value of the power backoff to satisfy the requirement 1 and does not satisfy the requirement 2 since the first shutdown timer or the second shutdown timer is not expired. In addition, at the time C1, the increase amount of the power backoff is greater than the threshold value of the power backoff to satisfy the requirement 3, and thus does not satisfy the requirement 2 since the second shutdown timer expires. Therefore, the surplus power report is not triggered at the points A1, B1, B2, and C1.

Next, at time B3, the reduction amount of the power backoff is greater than the threshold value of the power backoff, which satisfies Requirement 1, and since both the first and second cutoff timers have expired, the requirement 2 is also satisfied and the surplus power report is triggered (PHR). triggering by PMPR down), transmission of surplus power report (PHR Tx) occurs. When the decrease amount of the power backoff is greater than the threshold of the power backoff, the first shutdown timer is not restarted but only the second shutdown timer is restarted.

At time C2, requirement 3 is satisfied but before expiration after the second shutdown timer is restarted, so requirement 2 is not satisfied and surplus power reporting is not triggered.

At time A2, the periodic timer expires or the pathloss change is greater than the pathloss threshold to meet requirement 1, and requirement 2 is also satisfied because the first shutdown timer has expired. Therefore, the surplus power report is triggered (PHR triggering by PL), and the surplus power report transmission (PHR Tx) occurs. Since the change amount of the path loss is greater than the path loss threshold, the transmission of the surplus power report has occurred, so that the first cutoff timer that has already expired is restarted, and the second cutoff timer that has expired is also reset and restarted.

At the time point B4, since the first shutdown timer and the second shutdown timer are restarted and before expiration, requirement 1 is satisfied, but requirement 2 is not satisfied, so the surplus power report is not triggered.

Even at A3, requirement 1 is satisfied because the first shutdown timer is restarted and then expires, so surplus power reporting is not triggered because requirement 2 is still not satisfied.

At the time C3, since the second cutoff timer has expired, requirement 2 is satisfied regardless of the first cutoff timer. Since both Requirement 3 and Requirement 2 are met, surplus power reporting is triggered (PHR triggering by PMPR up) and surplus power reporting transmission (PHR Tx) occurs. The second cutoff timer restarts. However, the first shutdown timer does not reset or restart.

At time A4, the periodic timer expires or the pathloss change is greater than the pathloss threshold to meet requirement 1, and requirement 2 is also satisfied because the first shutdown timer has expired. Therefore, the surplus power report is triggered, and the transmission of the surplus power report (PHR Tx) occurs. Since the periodic timer expires or the amount of change in the path loss is greater than the path loss threshold, the transmission of the surplus power report has occurred, so that both the first and second interrupt timers which have already expired are restarted.

In FIG. 14, the value of the second cutoff timer is described as being smaller than the value of the first cutoff timer. This is merely an example. The value of the second cutoff timer may be greater than the value of the first cutoff timer.

15 is an explanatory diagram illustrating a trigger of surplus power report according to another example of the present invention. This is the case when there are two shutdown timers, and only the first shutdown timer is restarted by the transmission of the surplus power report triggered when the periodic timer expires or the path loss change is larger than the path loss threshold. In addition, the transmission of the surplus power report triggered by the power backoff increase or decrease amount restarts only the second shutdown timer.

Referring to FIG. 15, trigger requirements 1, 2, and 3 of the surplus power report are determined by the same method as described in FIG. However, there is a difference from FIG. 14 in view of the cause of restart or reset of the first shutdown timer and the second shutdown timer.

Judging whether the trigger requirement at each time point is satisfied is as follows.

First, at time A1, the periodic timer expires or the pathloss change becomes larger than the pathloss threshold to satisfy the requirement 1, and thus does not satisfy the requirement 2 since the first shutdown timer expires. Similarly, at the time points B1 and B2, the reduction amount of the power backoff is greater than the threshold value of the power backoff to satisfy the requirement 1 and does not satisfy the requirement 2 since the first shutdown timer or the second shutdown timer is not expired. Further, even at the time C1, the increase amount of the power backoff is greater than the threshold value of the power backoff to satisfy the requirement 3, and thus does not satisfy the requirement 2 since the second shutdown timer expires. Therefore, the surplus power report is not triggered at the points A1, B1, B2, and C1.

At time B3, the reduction in power backoff is greater than the threshold for power backoff, which satisfies requirement 1, and because both the first and second shutdown timers have expired, the requirement 2 is also satisfied and surplus power is triggered (PHR triggering by PMPR down). ), Transmission of surplus power report (PHR Tx) occurs. When the transmission of the surplus power report occurs, only the second shutdown timer is restarted.

At the time A2, since the first shutdown timer has expired, both the requirements 1 and 2 are satisfied so that the surplus power report is triggered (PHR triggering by PL), and the surplus power report transmission (PHR Tx) occurs. Unlike the embodiment of FIG. 14, when the periodic timer expires or the amount of change in the path loss is greater than the path loss threshold and the transmission of the surplus power report occurs, only the first block timer that has already expired is restarted, and the second block timer that has not expired is Do not reset or restart.

At time C2, requirement 2 is not satisfied because the second timeout timer has not expired, at time A3, requirement 1 is not satisfied because the first timeout timer has not expired, and at time B4, requirement 2 is not expired. Not satisfied Therefore, the surplus power report is not triggered at the time C2, A3, B4.

At the time C3, the increase in power backoff is greater than the power backoff threshold to meet requirement 3, and the second shutdown timer expires to satisfy requirement 2. Therefore, the surplus power report based on the power backoff is triggered (PHR triggering by PMPR up), and the transmission of the surplus power report occurs (PHR Tx). Then, only the second blocking timer is restarted. As such, the first shutdown timer is still not reset or restarted.

At B5, the second cutoff timer has not expired, so requirement 2 is not satisfied, and thus the surplus power report is not triggered.

At time A4, the periodic timer expires or the pathloss change is greater than the pathloss threshold to meet requirement 1, and the first shutdown timer also expires, thereby satisfying requirement 2. Therefore, the terminal triggers the surplus power report and transmits the surplus power report to the base station. At this time, only the first blocking timer is restarted. The second shutdown timer is still not restarted.

In FIG. 15, the value of the second cutoff timer is described as being smaller than the value of the first cutoff timer. This is merely an example, and the value of the second cutoff timer may be greater than the value of the first cutoff timer.

As shown in FIG. 14 to FIG. 15, when there are a plurality of cutoff timers, the triggering of the surplus power report by the amount of change in the periodic timer path loss is not intended by the transmission of the surplus power report by the power backoff (PHR Tx). Prevents being blocked; Unintentional blocking refers to a situation in which the start of the first blocking timer is affected by the transmission of the surplus power report (PHR Tx) such that the triggering of the PHR due to the change amount of the periodic timer path loss is blocked. In addition, it is possible to prevent unnecessary transmission of surplus power report (PHR Tx) due to power backoff through the second cutoff timer.

As described with reference to FIGS. 11 to 15, the trigger time of the surplus power report is determined by i) whether one or more shutdown timers are used, and ii) whether restart or reset timings of the plurality of shutdown timers are related by a trigger factor. It depends on whether you are independent. In other words, the timing at which the surplus power report is triggered is A2, B4, C1, C2 in FIG. 11, A2, B5, C1 in FIG. 12, A2, B4, C1, C2 in FIG. 13, and A2, A4 in FIG. 14. , B3, C3, and in FIG. 15, A2, A4, B3, and C3.

In this case, if one shutdown timer expires, even if requirement 1 of the surplus power reporting trigger is satisfied because the periodic timer expires, the change of the path loss becomes greater than the path loss threshold, or the decrease of the power backoff is greater than the power back off threshold, the requirement 2 is not satisfied. If not satisfied, no surplus power is triggered. That is, since the determination of the requirement 2 is to consider the shutdown timer, the surplus power report depends on the operation method of the shutdown timer. However, if the increase amount of the power backoff is greater than the power backoff threshold, it satisfies Requirement 3 to trigger surplus power reporting regardless of the operation of the shutdown timer.

On the other hand, when two cut-off timers satisfy requirement 2 as well as requirement 1, the requirement 2 must be satisfied. Therefore, the first and second cut-off timers are considered in all cases. Depends on.

16 is an explanatory diagram for explaining an embodiment in which the surplus power report is triggered based on the shutdown timer according to the present invention. This is an example of a case where the shutdown timer does not restart after reporting surplus power based on power backoff due to PMPR increase. This is a case where the surplus power report is triggered on the condition that the surplus power reportable state lasts for a predetermined time (Time To Trigger (TTT)). Sustained during the TTT applies only to the triggering of surplus power reporting for cases where the decrease in power backoff is greater than the power backoff threshold. That is, the surplus power report is triggered only when the state in which the power backoff reduction is larger than the threshold is maintained for the TTT. In FIG. 16, only the change amount of PMPR is shown.

Referring to FIG. 16, power backoff (P-MPR) changes over time, and requirement 1 may include a case where the amount of reduction in power backoff is greater than a power backoff threshold. Although not shown in FIG. 16, requirement 1 may include a case where the change amount of the path loss is greater than the path loss threshold or when the periodic timer expires. Requirement 2 is when the shutdown timer expires and Requirement 3 can include when the increase in power backoff is greater than the power backoff threshold. Alternatively, requirements 1 to 3 may be defined with a new baseline. On the other hand, surplus power report (PHR) transmission occurs when both requirement 1 and requirement 2 are met or when requirement 3 is met. The shutdown timer is restarted by all the surplus power reports except the surplus power report by the case where the increase in power backoff is greater than the threshold.

For example, triggered by satisfying requirement 1 and requirement 2 simultaneously at t ₀ , triggering of surplus power report and transmission of surplus power report occur. At this time, the shutdown timer is restarted.

t ₁ , since the cutoff timer has not expired, requirement 1 may be satisfied but requirement 2 is not satisfied.

At t ₂ , since no change in PMPR occurs at t ₀ , PHR transmission does not occur because requirement 1 is not met and requirement 2 is not met. The reason why the change in PMPR at t ₂ is compared based on t ₀ is that PHR transmission did not occur at time t ₁ . As described above, the change amount of the PMPR changes the path loss based on the point in time at which the PHR is transmitted. For example, the change amount of PMPR at t ₂ is 0 dB.

Requirement 1 and Requirement 2 are satisfied at t ₃ , but this condition must be continued by TTT to meet Requirement 4, but before the TTT expires, the power backoff value rises at t ₄ so that Requirement 1 does not persist. Since requirement 4 is not met, surplus power reporting is not triggered. Here, requirement 4 is a new trigger requirement, which is applicable only to the trigger according to the decrease of the power backoff value. The condition that satisfies Requirement 1 (limited to the case where the reduction in power backoff is greater than the threshold in FIG. 16) and Requirement 2 is required to be maintained for a certain time (during TTT). That is, the time when the surplus power report is triggered is not the first time to satisfy the requirements 1 and 2, but the time to satisfy the requirements 1 and 2 by the TTT. This is because the reduction of the power backoff value may be recognized as the change of the voice call state only when the corresponding decrease state is maintained until the TTT passes.

Meanwhile, since requirement 1 and requirement 2 are satisfied at t ₅ , and the state is continued by TTT so that requirement 4 is satisfied, the terminal only triggers surplus power reporting at t ₆ .

Requirement 4 does not take into account surplus power reporting under Requirement 3.

At t ₇ , requirement 3 is met, resulting in the transmission of surplus power reports. The transmission of the surplus power report has occurred, but because it is in compliance with Requirement 3, the shutdown timer is not restarted.

Here, when the surplus power report based on FIG. 16 operates in conjunction with the surplus power report (PHR trigger by PL) based on the path loss as shown in FIGS. 11 to 15, the description of FIGS. 11 to 15 may be applied as it is. For example, the cutoff timer in FIG. 16 may be the second cutoff timer in FIG. 14 or 15, and as in FIG. 14 or 15, the trigger of the surplus power report is generated or blocked. In this case, the TTT constituting requirement 4 does not take precedence over the first cutoff timer. That is, when the first shutdown timer expires, the surplus power report or the periodic surplus power report based on the path loss may still be triggered even if the TTT does not expire.

16 illustrates an example of a case in which the shutdown timer does not restart after reporting surplus power based on power backoff according to PMPR increase, but the scope of the present invention is not limited thereto. That is, even if the shutdown timer is restarted after the surplus power reporting based on the power backoff due to the increase of PMPR or when only the expired timer is restarted, the surplus power report is triggered when the requirement 4 by the TTT is satisfied. Can be.

In addition, according to FIG. 16, the duration of the TTT is explained only with respect to the trigger of the surplus power report when the reduction amount of the power backoff is greater than the power backoff threshold, but the scope of the present invention is not limited thereto. There is also room to apply when the periodic timer expires or when the amount of change in path loss is greater than the path loss threshold or when the amount of increase in power backoff is greater than the power back off threshold.

17 is a flowchart illustrating a method of performing a surplus power report of a terminal according to an embodiment of the present invention. As shown in FIG. 11, when the shutdown timer is one and the increase amount of the power backoff is greater than the threshold of the power backoff (requirement 3), the shutdown timer is not restarted.

 Referring to FIG. 17, the terminal receives an uplink grant from a base station (S1700). The uplink grant is downlink control information (DCI) of format 0 or 4 for uplink resource allocation for a terminal and is transmitted on a PDCCH. The uplink grant is configured as shown in Table 4 below.

Referring to Table 4, the uplink grant includes information such as RB, modulation and coding scheme (MCS), and TPC.

The terminal measures the current cutoff timer (S1705). The start time or restart time of the cutoff timer is as described above. The current cutoff timer may be measured in units of subframes.

The terminal determines whether the cutoff timer has expired based on the measured cutoff timer value (S1710). If the cutoff timer does not expire, it does not satisfy the requirement 2 of the trigger. Therefore, the trigger does not trigger surplus power reporting based on power backoff due to PMPR reduction or surplus power reporting based on the expiration of the periodic timer or the path loss variation.

When the cutoff timer expires, the terminal satisfies the requirement 2 of the trigger, and thus, the terminal compares the path loss change amount ΔPL with the path loss threshold value PL _TH and determines whether the periodic timer has expired (S1715).

If PL> PL _TH this periodic timer expires, it satisfies trigger requirement 1. Even if both requirements 1 and 2 of the trigger are satisfied, surplus power reports cannot be transmitted without uplink resources. Therefore, the terminal determines whether uplink resources for transmitting the surplus power report are secured (S1720). If the uplink resources are secured, the terminal transmits a surplus power report to the base station (S1725). The terminal restarts the cutoff timer (S1730).

In step S1720, if uplink resources are not secured, the terminal skips the transmission of the surplus power report (S1735).

In step S1715, if ΔPL> PL _TH and the periodic timer does not expire, the terminal determines whether the amount of power backoff reduction is greater than the power backoff threshold (S1740). If the power backoff reduction is greater than the power backoff threshold, the trigger meets requirement 1. Therefore, the terminal performs the process of step S1720 or less again. If the amount of power backoff reduction is not greater than the power backoff threshold, the terminal does not satisfy the requirement 1 of the trigger, so that the terminal terminates the procedure.

Again, even if the cutoff timer has not expired in step S1710, triggering of surplus power reporting based on power backoff due to PMPR increase is possible regardless of the requirement 2, so whether the increase in power backoff is greater than the threshold of power backoff It is determined (S1745). That is, it is determined whether the requirement 3 is satisfied.

If the requirement 3 is satisfied, the terminal transmits a surplus power report to the base station (S1750). The terminal terminates without restarting the cutoff timer. If the requirement 3 is not satisfied, the terminal terminates the procedure.

18 is a flowchart illustrating a method of performing a surplus power report of a terminal according to another embodiment of the present invention. As shown in FIG. 12, one interrupt timer is used, and when the surplus power report is triggered by the requirement 3, the interrupt timer is restarted.

Therefore, the embodiment of FIG. 18 differs only in whether the restart timer is restarted when the surplus power report is triggered according to the embodiment of FIG. 17 and requirement 3.

Referring to FIG. 18, the terminal receives an uplink grant from a base station (S1800). The uplink grant is as described above.

The terminal measures the current cutoff timer (S1805). The start time or restart time of the cutoff timer is as described above. The current cutoff timer may be measured in units of subframes.

The terminal determines whether the cutoff timer has expired based on the measured cutoff timer value (S1810).

When the cutoff timer expires, the terminal satisfies the requirement 2 of the trigger, and thus, the terminal compares the path loss change amount ΔPL with the path loss threshold PL _TH and determines whether the periodic timer has expired (S1815).

If PL> PL _TH this periodic timer expires, it satisfies trigger requirement 1. Even if both requirements 1 and 2 of the trigger are satisfied, surplus power reports cannot be transmitted without uplink resources. Therefore, the terminal determines whether uplink resources for transmitting the surplus power report are secured (S1820). If the uplink resources are secured, the terminal transmits a surplus power report to the base station (S1825). The terminal restarts the cutoff timer (S1830).

In step S1820, if uplink resources are not secured, the terminal skips the transmission of the surplus power report (S1835).

In step S1815, if ΔPL> PL _TH and the periodic timer does not expire, the terminal determines whether the amount of power backoff reduction is greater than the power backoff threshold (S1840). If the power backoff reduction is greater than the power backoff threshold, the trigger meets requirement 1. Therefore, the terminal performs the process of step S1820 or less again. If the amount of power backoff reduction is not greater than the power backoff threshold, the terminal does not satisfy the requirement 1 of the trigger, so that the terminal terminates the procedure.

Again, even if the cutoff timer has not expired in step S1810, triggering of surplus power reporting based on power backoff due to PMPR increase is possible regardless of the requirement 2, so whether the increase in power backoff is greater than the threshold of power backoff It is determined (S1845). That is, it is determined whether the requirement 3 is satisfied.

If the requirement 3 is satisfied, the terminal performs the process of step S1825 or less again. If the uplink resource is secured, the terminal transmits a surplus power report to the base station, and restarts the cutoff timer. If the requirement 3 is not satisfied, the terminal terminates the procedure.

19 is a flowchart illustrating a method of performing a surplus power report of a terminal according to another embodiment of the present invention. As shown in FIG. 13, if there is one stop timer, and if the requirement 3 is satisfied, only the expired stop timer is restarted.

Thus, the embodiment of FIG. 19 is distinguished from the embodiment of FIG. 17 whether to restart the sleep timer according to requirement 3, and is distinguished from the embodiment of FIG. 18 in whether to restart the sleep timer that has not expired.

Referring to FIG. 19, the terminal receives an uplink grant from a base station (S1900). The uplink grant is as described above.

The terminal measures the current cutoff timer (S1905). The start time or restart time of the cutoff timer is as described above. The current cutoff timer may be measured in units of subframes.

The terminal determines whether the cutoff timer has expired based on the measured cutoff timer value (S1910).

When the cutoff timer expires, the terminal 2 satisfies the requirement 2 of the trigger, and thus, the terminal compares the path loss change amount ΔPL with the path loss threshold PL _TH and determines whether the periodic timer has expired (S1915).

If PL> PL _TH this periodic timer expires, it satisfies trigger requirement 1. Even if both requirements 1 and 2 of the trigger are satisfied, surplus power reports cannot be transmitted without uplink resources. Therefore, the terminal determines whether uplink resources for transmitting the surplus power report are secured (S1920). If the uplink resources are secured, the terminal transmits a surplus power report to the base station (S1925). The terminal restarts the blocking timer (S1930). In step S1920, if uplink resources are not secured, the terminal skips the transmission of the surplus power report (S1935).

In step S1915, if ΔPL> PL _TH and the periodic timer does not expire, the terminal determines whether the amount of power backoff reduction is greater than the power backoff threshold (S1940). If the power backoff reduction is greater than the power backoff threshold, the trigger meets requirement 1. Therefore, the terminal performs the process of step S1920 or less again. If the amount of power backoff reduction is smaller than the power backoff threshold, the terminal does not satisfy the requirement 1 of the trigger, and thus the terminal terminates the procedure.

Again, even if the cutoff timer has not expired in step S1910, triggering of surplus power reporting based on power backoff due to PMPR increase is possible regardless of the requirement 2, so whether the increase in power backoff is greater than the threshold of power backoff It is determined (S1945). That is, it is determined whether the requirement 3 is satisfied.

If the requirement 3 is satisfied, the terminal transmits a surplus power report to the base station (S1950). The terminal determines whether the cutoff timer has expired (S1955), and restarts the cutoff timer when the cutoff timer has expired and is not yet started (S1960). Do not reset or restart the shutdown timer if the shutdown timer expires.

If the requirement 3 is not satisfied again in step S1945, the terminal terminates the procedure.

20 is a flowchart illustrating a method of performing a surplus power report of a terminal according to another embodiment of the present invention. There are two shutdown timers, and both the first shutdown timer and the second shutdown timer are reset or restarted by the surplus power reporting trigger based on the path loss change amount, as shown in FIG. 14, and the second shutdown timer by the surplus power reporting trigger based on the power backoff. Only the shutdown timer is reset or restarted.

Referring to FIG. 20, the terminal receives an uplink grant from a base station (S2000). The terminal measures the current first cutoff timer and the second cutoff timer (S2005).

The terminal first determines whether the first cutoff timer has expired based on the measured value of the first cutoff timer and the second cutoff timer (S2010). If the first blocking timer expires, the terminal 2 satisfies the requirement 2 of the trigger, and thus, the terminal compares the path loss change amount ΔPL and the path loss threshold value PL _TH (S2015). Or, the terminal determines whether the periodic timer has expired. Alternatively, the surplus power report trigger may be generated even when the period timer expires in step S2015.

In step S2015, if ΔPL> PL _TH this periodic timer expires, the requirement 1 of the trigger is satisfied. Even if both requirements 1 and 2 of the trigger are satisfied, surplus power reports cannot be transmitted without uplink resources. Therefore, the terminal determines whether uplink resources for transmitting the surplus power report are secured (S2020). If the uplink resources are secured, the terminal transmits a surplus power report to the base station (S2025). The terminal restarts both the first blocking timer and the second blocking timer (S2030). That is, when the transmission of the surplus power report based on the path loss occurs, both the first blocking timer and the second blocking timer are restarted.

In step S2020, if uplink resources are not secured, the terminal skips the transmission of the surplus power report (S2035).

In step S2015 again, if ΔPL> PL _TH and the periodic timer does not expire, the requirement 1 of the trigger is not satisfied. The terminal determines whether the second cutoff timer has expired (S2040). If the second cutoff timer does not expire, the terminal does not satisfy the requirement 2 of the trigger, so the terminal terminates the procedure. If the second cutoff timer expires, the terminal satisfies the requirement 2 of the trigger, and thus, the terminal determines whether the amount of power backoff reduction is greater than the power backoff threshold (S2045). If the amount of reduction in power backoff is greater than the power backoff threshold, the requirement 1 of the trigger is met. Therefore, the terminal determines whether an uplink resource for transmitting the surplus power report is secured (S2050). If the uplink resource is secured, the terminal transmits the surplus power report to the base station (S2055), and the terminal blocks the second cutoff timer. Only restart (S2060). That is, when transmission of the surplus power report based on power backoff due to PMPR reduction occurs, only the second cutoff timer is restarted.

In step S2050, if uplink resources are not secured, the terminal skips the transmission of the surplus power report (S2035).

In step S2010, if the first shutdown timer has not expired, it is determined whether the increase amount of the power backoff is greater than the threshold (S2065). That is, it is determined whether the requirement 3 is satisfied.

When the requirement 3 is satisfied, the terminal determines whether the requirement 2 has been satisfied whether the second blocking timer has expired. That is, the terminal performs the process of step S2040 or less again. If the requirement 3 is not satisfied, the terminal terminates the procedure.

21 is a flowchart illustrating a method of performing a surplus power report of a terminal according to another embodiment of the present invention. It has two shutdown timers, and as shown in FIG. 15, only the first shutdown timer is reset or restarted by the surplus power reporting trigger based on the path loss change amount, and only the second shutdown timer is reset or restarted by the surplus power reporting trigger based on the power backoff. It is restarted.

FIG. 21 is distinguished from whether only the first shutdown timer is reset or restarted or whether both the first shutdown timer and the second shutdown timer are reset or restarted by the surplus power reporting trigger based on the path loss variation.

Referring to FIG. 21, the terminal receives an uplink grant from a base station (S2100). The terminal measures the current first cutoff timer and the second cutoff timer (S2105).

The terminal first determines whether the first cutoff timer has expired based on the measured value of the first cutoff timer and the second cutoff timer (S2110). If the first blocking timer expires, the terminal 2 satisfies the requirement 2 of the trigger, and thus the terminal compares the path loss change amount ΔPL and the path loss threshold value PL _TH (S2115). Or, the terminal determines whether the periodic timer has expired. Alternatively, the surplus power reporting trigger may also occur when the period timer expires in step S2115.

In step S2115, if ΔPL> PL _TH this periodic timer expires, the requirement 1 of the trigger is satisfied. Even if both requirements 1 and 2 of the trigger are satisfied, surplus power reports cannot be transmitted without uplink resources. Therefore, the terminal determines whether uplink resources for transmitting the surplus power report are secured (S2120). If the uplink resource is secured, the terminal transmits a surplus power report to the base station (S2125). The terminal restarts only the first blocking timer (S2130). That is, when the transmission of the surplus power report based on the path loss occurs, only the first shutdown timer is restarted and does not affect the second shutdown timer.

In step S2120, if uplink resources are not secured, the terminal skips the transmission of the surplus power report (S2135).

In step S2115 again, if ΔPL> PL _TH and the periodic timer does not expire, the requirement 1 of the trigger is not satisfied. The terminal determines whether the second cutoff timer has expired (S2140). If the second cutoff timer does not expire, the terminal does not satisfy the requirement 2 of the trigger, so the terminal terminates the procedure.

If the second cutoff timer expires, the terminal satisfies the requirement 2 of the trigger, and thus the terminal determines whether the amount of power backoff reduction is greater than the power backoff threshold (S2145). If the amount of reduction in power backoff is greater than the power backoff threshold, the requirement 1 of the trigger is met. Therefore, the terminal determines whether an uplink resource for transmitting the surplus power report is secured (S2150). If the uplink resource is secured, the terminal transmits a surplus power report to the base station (S2155), and the terminal blocks the second cutoff timer. Only restart (S2160). That is, when transmission of the surplus power report based on power backoff due to PMPR reduction occurs, only the second shutdown timer is restarted and does not affect the first shutdown timer.

In step S2150, if uplink resources are not secured, the terminal skips the transmission of the surplus power report (S2135).

In step S2110, if the first shutdown timer has not expired, it is determined whether the increase amount of the power backoff is greater than the threshold (S2165). That is, it is determined whether the requirement 3 is satisfied.

If the requirement 3 is satisfied, the terminal determines whether the requirement 2 has expired or not, and performs the process of step S2140 or less again. If the requirement 3 is not satisfied, the terminal terminates the procedure.

22 is a flowchart illustrating a method of performing a surplus power report of a base station according to an embodiment of the present invention.

Referring to FIG. 22, the base station transmits cutoff timer setting information to the terminal (S2200). The cutoff timer setting information includes information about the length of the first cutoff timer and the second cutoff timer. The length of the first cutoff timer and the second cutoff timer may be in units of subframes. The cutoff timer setting information may have a form as shown in Table 2 or Table 3 as an RRC message.

The base station transmits an uplink grant to the terminal (S2210). The uplink grant is shown in Table 4, for example.

The base station receives the surplus power report transmitted through the uplink resources allocated by the uplink grant from the terminal (S2220).

23 is a block diagram showing a terminal and a base station for performing a surplus power report according to an embodiment of the present invention.

Referring to FIG. 23, the terminal 2300 includes a downlink receiver 2305, a trigger blocker 2310, a surplus power report generator 2315, and an uplink transmitter 2320.

The downlink receiver 2305 receives an uplink grant or an RRC message from the base station 2350. The RRC message includes cutoff timer setting information or MAC-MainConfig information element. For example, the RRC message may be the same as Table 2 or Table 3 above.

 The trigger blocking unit 2310 measures a change amount of the path loss for the secondary serving cell set in the terminal 2300 and an increase or decrease amount of the power backoff for the terminal 2300, and is used to block the trigger of the surplus power report. Measuring a first shutdown timer and a second shutdown timer and blocking at least one of a trigger of the first surplus power report based on the change amount of the path loss and a trigger of the second surplus power report based on the increase or decrease amount of the power backoff; Generate or cut off based on the state of the timer and the second cutoff timer.

For example, the trigger blocking unit 2310 blocks both the trigger of the first surplus power report and the trigger of the second surplus power report if the first interrupt timer does not expire. Alternatively, the trigger blocking unit 2310 generates or blocks a trigger of the second surplus power report based on the state of the second blocking timer. Further, when any one of the trigger of the first surplus power report and the trigger of the second surplus power report is triggered and transmitted, the trigger cutoff unit 2310 restarts at least one of the first and second cutoff timers.

More specifically, the trigger blocking unit 2310 may block or proceed the trigger of the surplus power report according to any one of FIGS. 17 to 21. That is, the trigger cutoff unit 2310 determines that the trigger requirement 1 is satisfied when the path loss change amount is greater than the path loss threshold value and the power backoff decrease amount is greater than the power backoff threshold value. It is determined that trigger requirement 2 is satisfied. In addition, if the power backoff increase is greater than the power backoff threshold, it is determined that trigger requirement 3 is satisfied.

The trigger blocking unit 2310 blocks the trigger of the surplus power report if the trigger requirement is not satisfied, and triggers the surplus power report if the trigger requirement is satisfied, and then notifies the surplus power report generation unit 2315.

The surplus power report generator 2315 generates a MAC control element (CE) for surplus power report and transmits it to the uplink transmitter 2320.

The uplink transmitter 2320 transmits the generated MAC control element for reporting the surplus power to the base station 2350.

The base station 2350 includes an RRC setting unit 2355, a scheduling unit 2360, a downlink transmitter 2365, and an uplink receiver 2370.

The RRC setting unit 2355 sets a cutoff timer, generates an RRC message including information on the cutoff timer, and sends it to the downlink transmitter 2365.

The scheduling unit 2360 performs uplink scheduling for the terminal 2300 and generates an uplink grant to be transmitted through the PDCCH.

The downlink transmitter 2365 transmits an RRC message or an uplink grant to the terminal 2300.

The uplink receiver 2370 receives the surplus power report transmitted by the trigger of the surplus power report from the terminal 2300.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (8)

In the terminal for performing a power headroom report (PHR),
A change amount of a pathloss (PL) for a serving cell configured in a terminal, an increase amount of power backoff (PB) for the terminal or a decrease amount of PB for the terminal, and triggering of PHR measure a first prohibit timer used to block a trigger, and determine at least one of a trigger of a first PHR based on a change amount of the PL and a trigger of a second PHR based on a decrease amount of the PB. A trigger cutoff unit generating or blocking based on a state of a cutoff timer or generating or blocking a trigger of a third PHR based on an increase amount of the PB;
A downlink receiving unit configured to receive an uplink grant from a base station for allocating a resource used to transmit a PHR;
A surplus power report generation unit for generating a medium access control (MAC) message including the PHR; And
And an uplink transmitter for transmitting the MAC message to the base station. The method of claim 1,
The trigger blocker further measures a second prohibit timer used to block a trigger of the PHR, and based on the state of the second prohibit timer, triggers of the second PHR and the third PHR. And generating or blocking at least one of the triggers. The method of claim 1,
The trigger blocking unit, characterized in that to block both the trigger of the first PHR and the trigger of the second PHR if the first blocking timer has not expired. The method of claim 1,
The trigger blocking unit may include restarting the first blocking timer when any one of the trigger of the first PHR and the trigger of the second PHR is triggered. In the method of performing the surplus power report (PHR) by the terminal,
A change amount of a path loss for a serving cell configured in a terminal, an increase amount of a power backoff (PB) for the terminal or a decrease amount of PB for the terminal, and a first cutoff timer used to block a trigger of the PHR Measuring;
A control procedure for generating or blocking at least one of the trigger of the first PHR based on the change amount of the PL and the trigger of the second PHR based on the decrease amount of the PB based on the state of the first shutdown timer or the increase amount of the PB. Performing a control procedure of generating or blocking a trigger of the third PHR based on the method;
Receiving an uplink grant from the base station that allocates resources used to transmit the PHR;
Generating a embedded access control (MAC) message including the PHR; And
And transmitting the MAC message to the base station. The method of claim 5, wherein
The performing of the control procedure further includes measuring a second shutdown timer used to block the trigger of the PHR,
And triggering the second PHR and triggering the third PHR are generated or blocked based on the state of the second shutdown timer. The method of claim 5, wherein
And if any one of the trigger of the first PHR and the trigger of the second PHR is triggered, the first shutdown timer is restarted. And if both of the trigger of the first PHR and the trigger of the second PHR are blocked, when the first shutdown timer does not expire.

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