JP2018026629A - User device and incoming signal transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve frequency utilization efficiency while considering interference with an adjacent system by determining transmission power or resource block when a user device transmits an incoming signal using a relationship between transmission power and an available resource block.SOLUTION: The user device in a radio communication system having a base station and the user device includes: a transmission power determination unit for determining maximum allowable transmission power on the basis of an available resource block as well as transmission power from the maximum allowable transmission power; and a transmission unit for transmitting an incoming signal by the determined transmission power.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a user apparatus and an uplink signal transmission method. In particular, the present invention relates to a user apparatus and an uplink signal transmission method for transmitting signals in consideration of interference with adjacent systems.

  In LTE (Long Term Evolution) wireless communication systems, protection regulations are provided so as not to interfere with other bands used in the same region (see Non-Patent Document 1).

  In order to satisfy this protection rule, a base station (eNodeB: evolved Node B) assigns a resource block (RB: Resource Block) to a user equipment (UE: User Equipment) under the cell or controls transmission power.

  In addition, when it is difficult to observe the protection regulations, it is also stipulated that A-MPR (Additional Maximum Power Reduction) that allows reduction of the maximum transmission power in the user apparatus is applied.

3GPP TS 36.101 V13.4.0 (2016-06) 3GPP TS 36.213 V13.2.0 (2016-06)

  The radio frequency is shared not only by the LTE radio communication system but also by satellite communication or the like.

  For example, in the 1.5 GHz band, a band from 1427.9 MHz to 1462.9 MHz can be used as an upstream band, and a band from 1475.9 MHz to 1510.9 MHz can be used as a downstream band. On the other hand, an Earth Exploration-Satellite Service (EESS) band exists adjacent to the upstream band. At this time, the interference given to the EESS band by the upstream signal needs to satisfy the EESS protection regulations.

  Normally, the protection provision is not finely defined for each transmission power of the uplink signal, but an interference value at a certain transmission power is defined. For this reason, when resource block allocation and transmission power control are performed in consideration of this interference value, resource block allocation is restricted more than necessary, and the frequency utilization efficiency decreases.

  FIG. 1 is a diagram showing an example of resource block allocation in the 1.5 GHz band. As described above, the band from 1427.9 MHz to 1462.9 MHz can be used as the upstream band of the 1.5 GHz band. When designing to use the entire band from 1427.9MHz to 1462.9MHz for the upstream band without setting an offset (also called a guard band) with EESS, resource blocks around 1427.9MHz in consideration of interference with EESS Are not actually allocated, and resource block allocation is limited. Further, such resource block allocation restrictions are also applied to user devices having a transmission power lower than the reference, and the frequency utilization efficiency decreases.

  Note that by setting an offset with EESS, the resource block allocation limit can be relaxed, and by increasing the offset, the resource block allocation limit can be eliminated. Since it is not used, the frequency utilization efficiency decreases.

  Such a decrease in frequency use efficiency may occur not only in the case where the adjacent system is EESS, but also in other systems.

  The present invention determines the transmission power or the resource block when the user apparatus transmits an uplink signal using the relationship between the transmission power and the available resource block, and uses the frequency while considering the interference to the adjacent system. The objective is to improve efficiency.

A user apparatus according to an aspect of the present invention is provided.
A user apparatus in a wireless communication system having a base station and a user apparatus,
A transmission power determining unit that determines a maximum allowable transmission power based on an available resource block, and determines a transmission power from the maximum allowable transmission power;
A transmission unit for transmitting an uplink signal with the determined transmission power;
It is characterized by having.

  According to the present invention, it is possible to improve frequency utilization efficiency while considering interference with adjacent systems.

Diagram showing an example of resource block allocation in the 1.5 GHz band The figure which shows the structural example of the radio | wireless communications system which concerns on the Example of this invention. The figure which shows the maximum permissible transmission power set according to the resource block which can be used The sequence diagram which shows the uplink signal transmission method based on the Example of this invention The figure which shows an example of the message for notifying the correspondence of P _{EMAX_RB} and RB The figure which shows an example of the correspondence of _{PEMAX_RB} and RB which are set to a base station and a user apparatus The block diagram which shows the function structure of a base station in the Example of this invention The block diagram which shows the function structure of the user apparatus which concerns on the Example of this invention. The figure which shows the resource block which can be used set according to the transmission power of a physical uplink shared channel The sequence diagram which shows the uplink signal transmission method of the physical uplink shared channel based on the Example of this invention The figure which shows an example of the hardware constitutions of the radio | wireless communication apparatus concerning the Example of this invention

  Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments. For example, although the wireless communication system according to the present embodiment assumes a system based on LTE, the present invention is not limited to LTE and can be applied to other systems. In addition, in this specification and claims, “LTE” corresponds to not only a communication method corresponding to Release 8 or 9 of 3GPP but also Release 10, 11, 12, 13, or Release 14 or later of 3GPP. It is used in a broad sense including the fifth generation communication system.

<System configuration>
FIG. 2 is a schematic diagram illustrating a configuration example of a wireless communication system according to an embodiment of the present invention. As shown in FIG. 2, the radio | wireless communications system which concerns on the Example of this invention has the base station eNB and the user apparatus UE. In the example of FIG. 2, one base station eNB and one user apparatus UE are illustrated, but a plurality of base stations eNB may be included, or a plurality of user apparatuses UE may be included.

  A base station eNB may accommodate one or multiple (eg, three) cells (also referred to as sectors). When the base station eNB accommodates multiple cells, the entire coverage area of the base station eNB can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (e.g., an indoor small base station RRH). : Remote Radio Head) can also provide communication services. The term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication services in this coverage. Further, the terms “base station”, “eNB”, “cell”, and “sector” may be used interchangeably herein. The base station eNB may be referred to by terms such as a fixed station, NodeB, eNodeB (eNB), access point, femtocell, and small cell.

  The user equipment UE is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, It may also be referred to as a wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terminology.

  The base station eNB and the user apparatus UE perform downlink (DL: Downlink) and uplink (UL: Uplink) communication using a predetermined band.

  First, the user apparatus UE needs to perform a cell search in order to communicate with the base station eNB. A signal used for the cell search is called a synchronization signal (SS), and the synchronization signal mainly includes a PSS (Primary Synchronization Signal) mainly for symbol timing synchronization and local ID detection, and mainly a radio frame. SSS (Secondary Synchronization Signal) for the purpose of synchronization and cell group ID detection is included.

  Basic information that the user apparatus UE should read after cell search is called broadcast information, and includes an MIB (Master Information Block) including a system bandwidth and a system frame number, and an SIB (System Information Block) that is other system information. Is included. The SIB may be transmitted using PDSCH (Physical Downlink Shared Channel).

  Next, signals used for uplink communication will be described.

  The user apparatus UE transmits uplink data using an uplink shared channel (uplink data channel) arranged in a predetermined band. The uplink shared channel may be referred to as a PUSCH (Physical Uplink Shared Channel).

  The user apparatus UE transmits SR (Scheduling Request) in order to request the base station eNB to allocate an uplink data channel. SR is transmitted by PUCCH (Physical Uplink Control Channel). When the resource block allocation is notified from the eNB to the SR by the UL grant (UL grant), the user apparatus UE can transmit data. In addition to the SR, the PUCCH transmits an ACK / NACK response to downlink data, quality information, and the like.

  Further, SRS (Sounding Reference Signal) is used as a reference signal for quality measurement. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot depending on an applied standard.

  The above channels and signals are examples in LTE, and names different from the above names may be used.

  The above-described channel and signal are transmitted in a predetermined part of a resource configured in a time domain and a frequency domain, for example. A radio frame may be composed of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe. A subframe may further be composed of one or more slots in the time domain. A slot may further be composed of one or more symbols (OFDM symbols, SC-FDMA symbols, etc.) in the time domain. Each of the radio frame, subframe, slot, and symbol represents a time unit for transmitting a signal. Radio frames, subframes, slots, and symbols may be called differently corresponding to each. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidth and / or transmission power that can be used in each user apparatus) to each user apparatus. The minimum scheduling time unit may be referred to as TTI (Transmission Time Interval). For example, one subframe may be called a TTI, a plurality of consecutive subframes may be called a TTI, and one slot may be called a TTI.

  The resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. In the time domain of the resource block, one or a plurality of symbols may be included, and one slot, one subframe, or a length of 1 TTI may be included. One TTI and one subframe may each be composed of one or a plurality of resource blocks. The structure of the radio frame described above is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, the number of symbols and resource blocks included in the slots, and the subframes included in the resource block The number of carriers can be variously changed.

Next, uplink transmission power control will be described. The user apparatus UE controls transmission power according to a transmission power control (TPC) command from the base station eNB. The base station eNB notifies the user apparatus UE of the maximum transmission power allowed in the cell (hereinafter referred to as the maximum allowable transmission power) P _EMAX , and the user apparatus UE uses the maximum transmission power P _CMAX of the user apparatus UE from P _EMAX. And transmission power is determined for each channel (see Non-Patent Documents 1 and 2).

  Here, considering the influence on the adjacent system, it is considered that the user apparatus UE having a small transmission power has a small influence on the adjacent system, and the user apparatus UE having a large transmission power has a large influence on the adjacent system. In other words, when the number of resource blocks for transmitting uplink signals is large or when the position of resource blocks for transmitting uplink signals is close to the adjacent system, the effect on the adjacent system is reduced by reducing the maximum allowable transmission power. Can be reduced. Further, when the number of resource blocks for transmitting uplink signals is small, or when the position of resource blocks for transmitting uplink signals is far from the adjacent system, the maximum allowable transmission power can be increased.

  In other words, the influence on the adjacent system can be reduced by limiting the resource block for transmitting the uplink signal to the user apparatus UE having a large transmission power. Moreover, the restriction | limiting of the resource block for transmitting an uplink signal can be made small with respect to the user apparatus UE with small transmission power.

  In the first embodiment of the present invention, a specific example in which the maximum allowable transmission power is determined in accordance with the number or position of resource blocks for transmitting an uplink signal in consideration of the influence on the adjacent system will be described.

  Also, in the second embodiment of the present invention, a specific example in which the PUSCH resource block is determined based on the transmission power of the PUSCH in consideration of such influence on the adjacent system will be described.

  Each example will be described in detail below.

<Example 1>
In the first embodiment of the present invention, a specific example in which the maximum allowable transmission power is determined according to the number or position of resource blocks for transmitting an uplink signal will be described.

FIG. 3 is a diagram showing the maximum allowable transmission power set according to the available resource block. The usable resource block indicates a resource block when the user apparatus UE transmits a signal such as PUSCH, PUCCH, SRS, and PRACH, and indicates a resource block allocated by the base station eNB in the case of PUSCH. In the case of PUCCH, SRS, PRACH, etc., a predetermined resource block that can be transmitted is shown. Here, in order to distinguish from the maximum transmission power P _EMAX allowed in the cell by the base station eNB, the maximum allowable transmission power set according to the available resource block is referred to as P _{EMAX_RB} . P _{EMAX_RB} may be set larger as the number of resource blocks usable by the user apparatus UE is smaller, and may be set smaller as the number of resource blocks usable by the user apparatus UE is larger.

For example, assuming that the system bandwidth is 10 MHz (50 RB), as shown in FIG. 3, when the number of RBs is 10 or less, P _{EMAX_RB} is ₂₃ dBm, and when the number of RBs is greater than 10 and 15 or less, P _{EMAX_RB} is P _{EMAX_RB} may be set to 10 dBm when the number of RBs is greater than 15 and less than or equal to 25, and P _{EMAX_RB} may be set to be 0 dBm when the number of RBs is greater than 25 and less than or equal to 50. Although FIG. 3 shows the relationship between P _{EMAX_RB} and the number of RBs in the form of a staircase graph, the relationship between P _{EMAX_RB} and the number of RBs may be expressed by an appropriate function.

3 shows the relationship between P _{EMAX_RB} and the number of RBs, the relationship between P _{EMAX_RB} and the position of an available resource block may be set. For example, P _{EMAX_RB} is set to be smaller as the distance that the resource block that can be used by the user apparatus UE can be separated from the adjacent system on the frequency axis is larger, and the resource block that can be used by the user apparatus UE is moved from the adjacent system to the frequency axis. The distance may be set larger as the distance away is smaller.

The embodiment of the present invention can also be applied to cases where carrier aggregation (CA) or dual connectivity (DC) is used, and can be used for each carrier carrier of carrier aggregation or dual connectivity. Maximum allowable transmission power P _{EMAX_RB, c} set according to a resource block may be defined.

  FIG. 4 is a sequence diagram illustrating an uplink signal transmission method according to an embodiment of the present invention.

The base station eNB broadcasts the maximum transmission power P _EMAX allowed in the cell to the user apparatus UE (step S101).

Then, the base station eNB notifies the user apparatus UE of the correspondence relationship between P _{EMAX_RB} and RB (step S103). FIG. 5 is a diagram illustrating an example of a message for notifying the correspondence relationship between P _{EMAX_RB} and RB. The base station eNB defines the correspondence between P _{EMAX_RB} and RB as shown in FIG. 3 as P-Max-RB-r14 and adds the item NS-PmaxValue-v14xy to the NS-PmaxList information element. May be notified to the user apparatus UE. This correspondence P-Max-RB-r14 may be notified by broadcast information (SIB1, SIB3, SIB5, etc.), may be notified by individual signaling (RadioResourceConfigCommon, etc.), and control information for side link communication ( (SL-DiscResourcePool, SL-DiscTxPowerInfo, SL-DiscSysInfoReport, etc.).

Alternatively, the correspondence relationship between P _{EMAX_RB} and RB is set in advance in the base station eNB and the user apparatus UE, and the base station eNB broadcasts a network signaling value (NS value: Network Signaling Value) to the user apparatus UE. _Thus , P _{EMAX_RB} may be selected according to the resource block by the user apparatus UE. FIG. 6 is a diagram illustrating an example of a correspondence relationship between P _{EMAX_RB} and RB set in the base station eNB and the user apparatus UE. FIG. 6 represents the graph of FIG. 3 in a table format. The base station eNB may broadcast a specific NS value (NS_XX) to the user apparatus UE and select P _{EMAX_RB} according to the number of resource blocks (N _RB ).

The user apparatus UE can recognize the correspondence between P _{EMAX_RB} and RB by the notification of the correspondence from the base station eNB or the notification of the NS value. The user apparatus UE refers to the correspondence relationship between P _{EMAX_RB} and RB, and determines P _{EMAX_RB} from the resource block for transmitting the uplink signal (step S105).

Then, the user apparatus UE determines transmission power from P _{EMAX_RB} (step S107).

Specifically, the user apparatus UE may determine that P _EMAX is the smaller of the maximum transmission power allowed in the cell and P _{EMAX_RB} and determine the transmission power of each channel. For example, in the calculation of LTE transmission power, P _EMAX is defined to be the same as the maximum transmission power P-Max allowed in the cell, but defined as P _EMAX = min (P-Max, P _{EMAX_RB} ). May be. Using this P _EMAX , the maximum transmission power P _CMAX of the user apparatus UE is calculated, and the transmission power is determined for each channel.

Alternatively, the user equipment UE, in the formula for calculating the P _CMAX from P _EMAX, may change the portion of the _{P EMAX min (P EMAX, P} EMAX_RB) and. In this case, P _CMAX cell _c, c P _{EMAX_RB} is P _{EMAX_RB} cell _c, it may be calculated by the following equation using or _c.
P _{CMAX_L, c ≤P CMAX, c ≤P CMAX_H, c}
P _{CMAX_L, c} = MIN {MIN (P _{EMAX, c} P _{EMAX_RB, c} ) -ΔT _{C, c} , P _PowerClass -MAX (MPR _c + A-MPR _c + ΔT _{IB, c} + ΔT _{C, c} + ΔT _ProSe , P-MPR _c )}
P _{CMAX_H, c} = MIN {P _{EMAX, c} , P _{EMAX_RB, c} , P _PowerClass }
However, ΔT _{C, c} represents the allowable amount of relaxation when using the resource block at the end of the frequency band, P _PowerClass represents the maximum transmission power provided by the UE, and MPR _c is determined by the modulation scheme and the number of resource blocks. A-MPR _c represents the amount of relaxation allowed to avoid interference with other adjacent systems, and ΔT _{IB, c} is the maximum transmission considering the loss in the duplexer in carrier aggregation It represents the lower limit of power, ΔT _ProSe represents the amount of power reduction when the UE supports ProSe (Proximity Services), and P-MPR _c is the application of SAR (Specific Absorption Rate) regulations that are allowed to the human body Represents power reduction to meet possible electromagnetic energy absorption requirements.

Using the P _{CMAX, c} calculated in this way, for example, the transmission power of PUSCH is obtained by the following equation.

P _{PUSCH, c} (i) = min {P _{CMAX, c} , 10log ₁₀ (M _{PUSCH, c} (i)) + P _{O_PUSCH, c} (j) + α _c (j) * PL _c + Δ _{TF, c} (i ) + f _c (i)}
Here, P _{PUSCH, c} (i) is the transmission power value of PUSCH in the i-th subframe. M _{PUSCH, c} (i) is the number of physical resource blocks for PUSCH transmission allocated to the i-th subframe. P _{O_PUSCH, c} (j) is the transmission power that is the basis of a predetermined PUSCH. α _c (j) is a coefficient by which the path loss is multiplied. PL _c is a path loss. Δ _{TF, c} (i) is an offset value by a modulation method or the like. f _c (i) is a cumulative value of TPC commands related to PUSCH instructed from the base station.

Transmission power of PUCCH, SRS, PRACH, etc. other than PUSCH can also be calculated using the maximum transmission power P _CMAX of the user apparatus UE.

  The user apparatus UE transmits uplink signals such as PUSCH, PUCCH, SRS, and PRACH with the determined transmission power (step S109).

<Example 1: Configuration of base station and user apparatus>
FIG. 7 is a block diagram showing a functional configuration of the base station 10 in the embodiment of the present invention.

  The base station 10 includes a correspondence setting unit 101, a transmission unit 103, and a reception unit 105.

The correspondence setting unit 101 sets the correspondence between P _{EMAX_RB} and available resource blocks as shown in FIG. 3 or FIG.

The transmission unit 103 generates various downlink signals to be transmitted from the base station 10 and transmits them to the user apparatus UE. The transmission unit 103 may explicitly transmit the correspondence relationship between P _{EMAX_RB} and RB to the user apparatus UE by broadcast information, individual signaling, or the like. Alternatively, the transmission unit 103 may transmit an NS value indicating the correspondence relationship between P _{EMAX_RB} and RB to the user apparatus UE. Moreover, the transmission part 103 transmits the allocation information of the resource block used when the user apparatus UE transmits an uplink signal to the user apparatus UE.

  The receiving unit 105 receives various uplink signals from the user apparatus UE.

  FIG. 8 is a block diagram showing a functional configuration of the user device 20 in the embodiment of the present invention.

  The user device 20 includes a reception unit 201, a transmission unit 203, a correspondence relationship setting unit 205, a resource block determination unit 207, and a transmission power determination unit 209.

The receiving unit 201 receives various downlink signals from the base station eNB. The receiving unit 201 receives the correspondence relationship or NS value between P _{EMAX_RB} and RB transmitted from the base station eNB. Moreover, the receiving part 201 receives the allocation information of the resource block used when the user apparatus UE transmits an uplink signal from the base station eNB.

  The transmission part 203 produces | generates the various uplink signal which should be transmitted from the user apparatus 20, and transmits to the base station eNB. The transmission unit 203 transmits an uplink signal with the resource block determined by the resource block determination unit 207 and the transmission power determined by the transmission power determination unit 209.

When the receiving unit 201 receives the correspondence between P _{EMAX_RB} and RB, the correspondence setting unit 205 stores the received correspondence. Correspondence setting section 205 sets the correspondence between P _{EMAX_RB} and RB in advance, and uses the correspondence set in advance in the calculation of transmission power when receiving section 201 receives the NS value. Set as follows.

  The resource block determination unit 207 determines a resource block that can be used for transmitting an uplink signal. In the case of PUSCH transmission, resource blocks are allocated by UL grant from the base station eNB, and therefore the resource block determination unit 207 determines the resource blocks allocated by the base station eNB as usable resource blocks. In the case of PUCCH, SRS, PRACH, and the like, the resource block determination unit 207 determines a predetermined transmittable resource block as an available resource block.

The transmission power determination unit 209 determines P _{EMAX_RB} based on the available resource blocks, and determines transmission power from P _{EMAX_RB} . Specifically, as described with reference to FIG. 4, the transmission power determination unit 209 refers to the correspondence relationship between P _{EMAX_RB} and RB, and the number of resource blocks that can be used for transmitting an uplink signal. Alternatively, P _{EMAX_RB} is determined from the position, and transmission power is determined from P _{EMAX_RB} .

<Example 2>
In the second embodiment of the present invention, a specific example in which PUSCH resource blocks are determined based on PUSCH transmission power will be described.

  FIG. 9 is a diagram showing usable resource blocks set according to the transmission power of the physical uplink shared channel. The usable resource block indicates a resource block when the user apparatus UE transmits a PUSCH signal. Normally, the usable resource block is a resource block allocated by the base station eNB, but here, an upper limit is set for the resource block when transmitting a PUSCH signal according to the transmission power of the PUSCH. The upper limit value of this resource block may be set smaller as the PUSCH transmission power is larger, and may be set larger as the PUSCH transmission power is smaller.

For example, assuming that the system bandwidth is 10 MHz (50 RB), as shown in FIG. 9, when the PUSCH transmission power P _{PUSCH, c} is 0 dBm or less, the upper limit of the PUSCH resource block is 50, and P _{PUSCH, c} Is greater than 0 dBm and less than or equal to 10 dBm, the upper limit of the PUSCH resource block is 25. When P _{PUSCH, c} is greater than 10 dBm and less than or equal to 15 dBm, the upper limit of the PUSCH resource block is 15, and P _{PUSCH, c} is 15 dBm. When it is greater than 23 dBm, the upper limit of the PUSCH resource block may be set to 10. Although FIG. 9 shows the relationship between the number of RBs and P _{PUSCH, c in} the form of a staircase graph, the relationship between the number of RBs and P _{PUSCH, c} may be expressed by an appropriate function.

9 shows the relationship between the number of RBs and P _{PUSCH, c} , the relationship between P _{PUSCH, c} and the position of an available resource block may be set. For example, the position of the usable resource block is set to a position away from the adjacent system on the frequency axis as P _{PUSCH, c} is larger, and is set closer to the frequency axis from the adjacent system as P _{PUSCH, c} is smaller. May be.

  The embodiments of the present invention can also be applied to cases where carrier aggregation (CA) or dual connectivity (DC) is used. For each carrier carrier of carrier aggregation or dual connectivity, the PUSCH An upper limit may be set for a resource block when a PUSCH signal is transmitted according to transmission power.

  FIG. 10 is a sequence diagram illustrating an uplink signal transmission method according to the embodiment of the present invention.

The base station eNB broadcasts the maximum transmission power P _EMAX allowed in the cell to the user apparatus UE (step S201).

  Then, the base station eNB notifies the user apparatus UE of the correspondence relationship between the available resource blocks and the PUSCH transmission power (step S203). Similarly to FIG. 5, a message for notifying the correspondence between the available resource block and the PUSCH transmission power may be defined, and the correspondence may be notified to the user apparatus UE by broadcast information, individual signaling, or the like.

  Alternatively, a correspondence relationship between usable resource blocks and PUSCH transmission power is set in advance in the base station eNB and the user apparatus UE, and the base station eNB sends a network signaling value (NS value: Network Signaling) to the user apparatus UE. By broadcasting (Value), the user apparatus UE may be allowed to select a resource block that can be used according to the PUSCH transmission power.

  The base station eNB allocates resource blocks to the user apparatus UE according to the SR from the user apparatus UE, and notifies the resource block allocation by UL grant (step S205).

The user apparatus UE determines transmission power from P _EMAX (step S207).

Specifically, the user apparatus UE calculates the maximum transmission power P _CMAX of the user apparatus UE using P _EMAX and determines the PUSCH transmission power.

For example, P _CMAX cell _{c, c} P _EMAX is the P _EMAX cell _c, it may be calculated by the following equation using or _c.
P _{CMAX_L, c ≤P CMAX, c ≤P CMAX_H, c}
P _{CMAX_L, c} = MIN {P _{EMAX, c} -ΔT _{C, c} , P _PowerClass -MAX (MPR _c + A-MPR _c + ΔT _{IB, c} + ΔT _{C, c} + ΔT _ProSe , P-MPR _c )}
P _{CMAX_H, c} = MIN {P _{EMAX, c} , P _PowerClass }
However, ΔT _{C, c} represents the allowable amount of relaxation when using the resource block at the end of the frequency band, P _PowerClass represents the maximum transmission power provided by the UE, and MPR _c is determined by the modulation scheme and the number of resource blocks. A-MPR _c represents the amount of relaxation allowed to avoid interference with other adjacent systems, and ΔT _{IB, c} is the maximum transmission considering the loss in the duplexer in carrier aggregation It represents the lower limit of power, ΔT _ProSe represents the amount of power reduction when the UE supports ProSe (Proximity Services), and P-MPR _c is the application of SAR (Specific Absorption Rate) regulations that are allowed to the human body Represents power reduction to meet possible electromagnetic energy absorption requirements.

Using P _{CMAX, c} calculated in this way, the transmission power of PUSCH is obtained by the following equation.

P _{PUSCH, c} (i) = min {P _{CMAX, c} , 10log ₁₀ (M _{PUSCH, c} (i)) + P _{O_PUSCH, c} (j) + α _c (j) * PL _c + Δ _{TF, c} (i ) + f _c (i)}
Here, P _{PUSCH, c} (i) is the transmission power value of PUSCH in the i-th subframe. M _{PUSCH, c} (i) is the number of physical resource blocks for PUSCH transmission allocated to the i-th subframe. P _{O_PUSCH, c} (j) is the transmission power that is the basis of a predetermined PUSCH. α _c (j) is a coefficient by which the path loss is multiplied. PL _c is a path loss. Δ _{TF, c} (i) is an offset value by a modulation method or the like. f _c (i) is a cumulative value of TPC commands related to PUSCH instructed from the base station.

  Further, the user apparatus UE refers to the correspondence relationship between the available resource blocks and the PUSCH transmission power, determines the available resource blocks according to the PUSCH transmission power, and determines the determined number of usable resource blocks The smaller of the number of resource blocks allocated by the UL grant is determined as the number of PUSCH resource blocks (step S209).

  The user apparatus UE transmits the PUSCH uplink signal using the determined resource block (step S211).

<Embodiment 2: Configuration of base station and user equipment>
The base station according to the embodiment of the present invention is configured similarly to FIG.

  The correspondence setting unit 101 sets the correspondence between usable resource blocks and PUSCH transmission power as shown in FIG.

  The transmission unit 103 generates various downlink signals to be transmitted from the base station 10 and transmits them to the user apparatus UE. The transmission unit 103 may explicitly transmit the correspondence relationship between the available resource block and the PUSCH transmission power to the user apparatus UE using broadcast information, individual signaling, or the like. Or the transmission part 103 may transmit NS value which shows the resource block and PUSCH transmission power which can be used to the user apparatus UE. Moreover, the transmission part 103 transmits the allocation information of the resource block used when the user apparatus UE transmits the uplink signal of PUSCH to the user apparatus UE.

  The receiving unit 105 receives various uplink signals from the user apparatus UE.

  The user apparatus according to the embodiment of the present invention is configured similarly to FIG.

  The receiving unit 201 receives various downlink signals from the base station eNB. The receiving unit 201 receives a correspondence relationship or an NS value between an available resource block and PUSCH transmission power transmitted from the base station eNB. Moreover, the receiving part 201 receives the allocation information of the resource block used when the user apparatus UE transmits the uplink signal of PUSCH from the base station eNB.

  The transmission part 203 produces | generates the various uplink signal which should be transmitted from the user apparatus 20, and transmits to the base station eNB. The transmission unit 203 transmits an uplink signal with the resource block determined by the resource block determination unit 207 and the transmission power determined by the transmission power determination unit 209.

  When the correspondence relationship setting unit 205 receives the correspondence relationship between the resource block that can be used by the reception unit 201 and the PUSCH transmission power, the correspondence relationship setting unit 205 stores the received correspondence relationship. Correspondence setting section 205 presets the correspondence between usable resource blocks and PUSCH transmission power, and is set in advance in transmission power calculation when receiving section 201 receives an NS value. Set to use correspondence.

The transmission power determination unit 209 determines PUSCH transmission power. Specifically, as described with reference to FIG. 10, the transmission power determination unit 209 determines transmission power from P _EMAX .

  The resource block determination unit 207 determines a PUSCH resource block based on the transmission power of the PUSCH. Specifically, as described with reference to FIG. 10, the resource block that can be used is determined according to the PUSCH transmission power with reference to the correspondence between the available resource block and the PUSCH transmission power. Further, before transmission of PUSCH, resource blocks are allocated by UL grant from the base station eNB, and the resource block determination unit 207 determines the number of usable resource blocks and resource blocks allocated by the UL grant. The smaller of the number is determined as the number of PUSCH resource blocks.

<Hardware configuration>
In addition, the block diagram used for description of the said Example has shown the block of the functional unit. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.

  For example, a base station, a user apparatus, etc. in an embodiment of the present invention may function as a computer that performs processing of the uplink signal transmission method of the present invention. FIG. 11 is a diagram illustrating an example of a hardware configuration of a wireless communication apparatus that is the base station 10 or the user apparatus 20 according to the embodiment of the present invention. The base station 10 and the user device 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .

  In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the base station 10 and the user apparatus 20 may be configured to include one or a plurality of the apparatuses illustrated in the figure, or may be configured not to include some apparatuses.

  Each function in the base station 10 and the user apparatus 20 is performed by causing the processor 1001 to perform calculation by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and communication by the communication apparatus 1004 and / or Alternatively, it is realized by controlling data reading and / or writing in the memory 1002 and the storage 1003.

  For example, the processor 1001 controls the entire computer by operating an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the above-described correspondence setting unit 101, the correspondence setting unit 205, the resource block determination unit 207, the transmission power determination unit 209, and the like may be realized by the processor 1001.

  Further, the processor 1001 reads a program (program code), a software module, and / or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the correspondence relationship between the correspondence relationship setting unit 101 of the base station 10 and the correspondence relationship setting unit 205 of the user device 20 may be stored in the memory 1002 and realized by a control program operating on the processor 1001. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

  The memory 1002 is a computer-readable recording medium and includes, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the uplink signal transmission method according to an embodiment of the present invention.

  The storage 1003 is a computer-readable recording medium, such as an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. The storage 1003 may be referred to as an auxiliary storage device. The storage medium described above may be, for example, a database, server, or other suitable medium including the memory 1002 and / or the storage 1003.

  The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. For example, the transmission unit 103, the reception unit 105, the reception unit 201, the transmission unit 203, and the like described above may be realized by the communication device 1004.

  The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that accepts an external input. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

  Each device such as the processor 1001 and / or the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.

  The base station 10 and the user apparatus 20 include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). Hardware may be configured, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.

<Effect of the embodiment of the present invention>
According to the embodiment of the present invention, it is possible to improve the frequency utilization efficiency while considering the interference with the adjacent system.

  By defining the correspondence between the transmission power and the number or location of resource blocks that can be used, the resource blocks that can be used by user equipment with low transmission power can be increased, and the transmission power can be maximized by resource blocks. It becomes possible to use. Therefore, the frequency efficiency can be improved, and the influence that the communicable area becomes narrow due to the decrease in transmission power can be reduced.

  The first embodiment can be applied to other channels regardless of the PUSCH.

  In addition, the second embodiment cannot be applied to PUCCH, SRS, PRACH, etc., in which the number of resource blocks is fixed. Becomes higher.

<Supplement>
Each aspect / example described in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, Future Radio Access (FRA), W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), The present invention may be applied to a Bluetooth (registered trademark), a system using other appropriate systems, and / or a next generation system extended based on these systems.

  As used herein, the terms “system” and “network” are used interchangeably.

  The specific operation assumed to be performed by the base station in this specification may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by a base station and / or other network nodes other than the base station (e.g., Obviously, this can be done by MME or S-GW, but not limited to these. Although the case where there is one network node other than the base station in the above is illustrated, a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.

  Information or the like can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

  Input / output information or the like may be stored in a specific location (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.

  The notification of information is not limited to the aspect / example described in the present specification, and may be performed by other methods. For example, notification of information includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.

  The determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true / false value (Boolean: true or false), or may be performed by comparing numerical values (for example, a predetermined value) Comparison with the value).

  Software, whether it is called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be interpreted broadly.

  Also, software, instructions, etc. may be transmitted / received via a transmission medium. For example, software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave. When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.

  Information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of

  Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning. For example, the channel and / or symbol may be a signal. The signal may be a message. Further, the component carrier (CC) may be called a carrier frequency, a cell, or the like.

  In addition, information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information. . For example, the radio resource may be indicated by an index.

  The names used for the parameters described above are not limiting in any way. Further, mathematical formulas and the like that use these parameters may differ from those explicitly disclosed herein. Since various channels (eg, PUCCH, PDCCH, etc.) and information elements (eg, TPC, etc.) can be identified by any suitable name, the various names assigned to these various channels and information elements are However, it is not limited.

  As used herein, the terms “determining” and “determining” may encompass a wide variety of actions. “Judgment”, “decision” can be, for example, calculating, computing, processing, deriving, investigating, looking up (eg, table, database or another (Searching in the data structure), and confirming (ascertaining) what has been confirmed may be considered as “determining” or “determining”. In addition, “determination” and “determination” include receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (accessing) (e.g., accessing data in a memory) may be considered as "determined" or "determined". In addition, “determination” and “decision” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “deciding”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.

  The terms “connected”, “coupled”, or any variation thereof, means any direct or indirect connection or coupling between two or more elements and It can include the presence of one or more intermediate elements between two “connected” or “coupled” elements. The coupling or connection between the elements may be physical, logical, or a combination thereof. As used herein, the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples By using electromagnetic energy, such as electromagnetic energy having a wavelength in the region, microwave region, and light (both visible and invisible) region, it can be considered to be “connected” or “coupled” to each other.

  As used herein, the phrase “based on” does not mean “based only on,” unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

  Any reference to elements using the designations "first", "second", etc. as used herein does not generally limit the amount or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, a reference to the first and second elements does not mean that only two elements can be employed there, or that in some way the first element must precede the second element.

  As long as “including”, “comprising” and variations thereof are used in the specification or claims, these terms are inclusive of the term “comprising”. Intended to be Furthermore, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

  As long as there is no contradiction, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / example described in this specification may be changed. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

  Each aspect / example demonstrated in this specification may be used independently, may be used in combination, and may be switched and used with execution. In addition, notification of predetermined information (for example, notification of being “X”) is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.

  Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

DESCRIPTION OF SYMBOLS 10 Base station 101 Correspondence setting part 103 Transmission part 105 Reception part 20 User apparatus 201 Reception part 203 Transmission part 205 Correspondence setting part 207 Resource block determination part 209 Transmission power determination part

Claims (6)

A user apparatus in a wireless communication system having a base station and a user apparatus,
A transmission power determining unit that determines a maximum allowable transmission power based on an available resource block, and determines a transmission power from the maximum allowable transmission power;
A transmission unit for transmitting an uplink signal with the determined transmission power;
A user device. A receiver that receives information indicating a correspondence relationship between a maximum allowable transmission power and an available resource block from the base station;
The transmission power determining unit refers to the correspondence relationship, determines the maximum allowable transmission power from the number or position of resource blocks that can be used for transmitting the uplink signal, and determines the transmission power from the maximum allowable transmission power. The user device according to claim 1, wherein the user device is determined. A user apparatus in a wireless communication system having a base station and a user apparatus,
A transmission power determination unit that determines transmission power of the physical uplink shared channel;
A resource block determining unit that determines a resource block of the physical uplink shared channel based on transmission power of the physical uplink shared channel;
A transmitting unit for transmitting a signal of the physical uplink shared channel using the determined resource block;
A user device. A receiving unit that receives information indicating a correspondence relationship between transmission power of the physical uplink shared channel and available resource blocks from the base station;
The resource block determination unit determines the number of resource blocks that can be used for the physical uplink shared channel with reference to the correspondence relationship, and the determined number of resource blocks and the physical uplink shared allocated by the base station The user apparatus according to claim 3, wherein the smaller of the number of channel resource blocks is determined as the number of resource blocks of the physical uplink shared channel. An uplink signal transmission method in a user apparatus in a wireless communication system having a base station and a user apparatus,
Determining a maximum allowable transmission power based on an available resource block, and determining a transmission power from the maximum allowable transmission power;
Transmitting an uplink signal with the determined transmission power;
An uplink signal transmission method comprising: An uplink signal transmission method in a user apparatus in a wireless communication system having a base station and a user apparatus,
Determining the transmission power of the physical uplink shared channel;
Determining resource blocks of the physical uplink shared channel based on transmission power of the physical uplink shared channel;
Transmitting the signal of the physical uplink shared channel in the determined resource block;
An uplink signal transmission method comprising: