JP2012216968A - Method used in mobile station and radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology to determine the maximum transmission power of a mobile station for each component carrier (CC) in order to transmit various channels simultaneously in a radio communication system in which carrier aggregation (CA) is applied.SOLUTION: A mobile station used in a radio communication system employing CA comprises: a control signal receiving unit for receiving a control signal indicating multiple channels allocated such that the mobile station transmits them simultaneously by use of multiple CCs; and a maximum transmission power calculation unit for calculating transmission power to transmit multiple channels allocated to the multiple CCs and for calculating the maximum transmission power to transmit each of the multiple CCs based on the calculated transmission power of the multiple channels. The maximum transmission power calculation unit determines the maximum transmission power such that transmission power is secured to transmit a high-priority channel among the multiple channels according to a prescribed channel priority order where a control channel is assigned as the highest priority order.

Description

  The present invention relates generally to wireless communication systems, and more particularly to wireless communication systems that utilize carrier aggregation techniques.

  In the LTE (Long Term Evolution) scheme, an orthogonal frequency division multiple access (OFDMA) scheme is used as an uplink radio access scheme, and a single carrier frequency division multiple access (SC-FDMA) scheme as a downlink radio access scheme. : Single-Carrier Frequency Division Multiple Access) method is used.

  The OFDMA scheme is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is transmitted by each subcarrier. According to the OFDMA scheme, it is possible to realize high-speed transmission and improve frequency utilization efficiency by arranging subcarriers densely while being orthogonal to each other on the frequency axis.

  The SC-FDMA scheme is a single carrier transmission scheme in which data is transmitted by dividing a frequency band and assigning different frequency bands to each mobile station. According to the SC-FDMA system, fluctuations in transmission power can be suppressed, so that power consumption of the mobile station can be reduced.

By the way, the standardization organization 3GPP (3rd Generation Partnership Project) is currently standardizing the LTE-Advanced system, which is an extension of LTE. In the LTE-Advanced scheme, carrier aggregation (CA) technology is introduced in order to achieve a throughput that exceeds LTE while maintaining backward compatibility with the LTE scheme. In CA, communication is performed using a plurality of LTE carriers called component carriers (CCs) at the same time. For this reason, in order to determine the transmission power allocated to each CC, the maximum transmission power P _{cmax, c} of the mobile station for each CC is considered.

  Further, in 3GPP Release 10, a rule for simultaneously transmitting various channels in a plurality of CCs is being formulated. Specifically, as shown in FIG. 1, an uplink physical shared channel (PUSCH) that is a data channel, and an uplink physical control channel (PUCCH) that is a control channel, Are being considered for simultaneous transmission. Furthermore, PUSCH may be subdivided into PUSCH (PUSCH w / UCI) having uplink control information (UCI) and PUSCH without PUCI (PUSCH w / o UCI) and transmitted. It is being considered. In addition to these channels, SRS (Sounding Reference Signal), which is an uplink reference signal for measuring the channel state, is also being considered for simultaneous transmission.

3GPP TS36.101 3GPP TS 36.213

However, it has not been studied how to determine the transmission power allocated to each CC when the above-described PUCCH, PUSCH, and SRS are simultaneously transmitted by a plurality of CCs using CA technology. For this reason, since PUCCH, PUSCH, and SRS are simultaneously transmitted by a plurality of CCs, a technique for determining the maximum transmission power P _{cmax, c} of the mobile station for each CC is required.

  In view of the above problems, an object of the present invention is to provide a technique for determining the maximum transmission power of a mobile station for each CC in order to simultaneously transmit various channels in a wireless communication system to which CA is applied. .

  In order to solve the above problems, one feature of the present invention is a mobile station used in a wireless communication system using carrier aggregation, and the mobile station is assigned to transmit simultaneously using a plurality of component carriers. A control signal receiving unit that receives control signals indicating a plurality of channels, and a transmission power for transmitting the plurality of channels assigned to the plurality of component carriers are calculated, and the calculated transmission power of the plurality of channels is calculated. A maximum transmission power calculation unit that calculates a maximum transmission power for transmitting each of the plurality of component carriers based on the predetermined channel assigned the control channel with the highest priority. According to the priority order, a channel having a higher priority among the plurality of channels is transmitted. A mobile station for determining the maximum transmission power so as to ensure the transmission power for.

  According to the present invention, since various channels are simultaneously transmitted in a radio communication system to which CA is applied, the maximum transmission power of a mobile station for each CC can be determined.

FIG. 1 is a schematic diagram illustrating an example assignment of various channels to component carriers by carrier aggregation. FIG. 2 is a block diagram illustrating a wireless communication system according to an embodiment of the present invention. FIG. 3 is a block diagram showing a configuration of a mobile station according to an embodiment of the present invention. FIG. 4 is a schematic diagram illustrating an example assignment of SRS to component carriers by carrier aggregation. FIG. 5 is a flowchart illustrating an exemplary process for determining the maximum transmission power in a mobile station according to an embodiment of the present invention. FIG. 6 is a flowchart showing an exemplary process for determining the transmission power of the PUCCH in the mobile station according to an embodiment of the present invention. FIG. 7 is a flowchart showing another example process for determining the transmission power of the PUCCH in the mobile station according to one embodiment of the present invention. FIG. 8 is a flowchart showing an exemplary process for determining the transmission power of PUSCH having UCI in a mobile station according to an embodiment of the present invention. FIG. 9 is a flowchart showing an exemplary process for determining transmission power of PUSCH without UCI in a mobile station according to an embodiment of the present invention. FIG. 10 is a flowchart showing an exemplary process for determining SRS transmission power in a mobile station according to an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The LTE-Advanced system using carrier aggregation (CA), maximum transmittable transmit power _{P cmax} uplink for each component carrier _{(CC), c} is determined, the determined maximum transmission power _{P cmax, c} The transmission power of each CC is controlled so as not to exceed. More specifically, since the mobile station determines the maximum transmission power P _{cmax, c} of each CC _, the upper limit value P _cmax, c_H and the lower limit value P _{cmax, c} of the maximum transmission power P _{cmax, c} are determined for each CC _. and _c _L calculated in accordance with a predetermined calculation formula, the upper limit value _{P cmax,} c _H and the lower limit value _{P cmax,} maximum transmission in the range defined by the c _L power _{P cmax,} determines or _c. The mobile station controls the transmission power of each CC so as not to exceed the determined maximum transmission power P _{cmax, c} .

  Further, in 3GPP Release 10, a rule for simultaneously transmitting various channels in a plurality of CCs is being formulated. Specifically, an uplink physical shared channel (PUSCH) that is a data channel, an uplink physical control channel (PUCCH) that is a control channel, and an uplink for measuring a channel state It has been studied that SRS (Sounding Reference Signal) as a reference signal is transmitted simultaneously. Furthermore, PUSCH may be subdivided into PUSCH (PUSCH w / UCI) having uplink control information (UCI) and PUSCH without PUCI (PUSCH w / o UCI) and transmitted. It is being considered.

  When various channels are simultaneously transmitted by a plurality of CCs, it is considered that the CC transmission power needs to be determined so as to preferentially secure the transmission power of a channel with a high priority. In general, a high priority needs to be set for a channel including control information, and it is considered necessary to preferentially secure the transmission power. For this reason, in one embodiment of the present invention, transmission power necessary for transmitting a channel including control information is first considered in consideration of the channel type, and the surplus power is allocated to the transmission power of other channels.

  On the other hand, in CA, several CC is divided roughly into a primary cell and a secondary cell. In CA, the plurality of CCs are sequentially set between the mobile station and the base station. The primary cell is a CC set first between the base station and the mobile station, and the secondary cell is a CC set second and later. Generally, it is desired that the primary cell is transmitted with priority over the secondary cell. For this reason, in one embodiment of the present invention, the transmission power necessary to transmit the primary cell is first secured in consideration of the CC or the cell type, and the surplus power is allocated to the transmission power of the secondary cell.

  As will be described later, the maximum transmission power available for each CC may be determined in consideration of both the channel type and the cell type.

  First, a radio communication system according to an embodiment of the present invention will be described with reference to FIG. The wireless communication system according to the present embodiment is an LTE-Advanced system that performs wireless communication using CA technology. In CA, communication is performed using a plurality of CCs simultaneously to enable broadband transmission. Furthermore, in the wireless communication system according to the present embodiment, different types of channels of PUCCH, PUSCH w / UCI, PUSCH w / o UCI, and SRS are simultaneously transmitted using a plurality of CCs. However, the present invention is not limited to this, and can be applied to any other suitable wireless communication system that simultaneously transmits different types of channels using a plurality of carriers or cells.

  FIG. 2 is a block diagram illustrating a wireless communication system according to an embodiment of the present invention. As shown in FIG. 2, the wireless communication system 10 includes a base station 50 and a mobile station 100. Although only one base station 50 is shown in the illustrated embodiment, typically, in the wireless communication system 10, a plurality of base stations 50 are arranged to cover the service area of the system. The base station 50 covers a certain geographical area and provides various communication services to the mobile station 100 by wirelessly communicating with the mobile station 100 located in the area. In the following embodiments, transmission power control processing for each CC in uplink communication using CA technology using a plurality of CCs will be described. However, the present invention is not limited to this, and can be similarly applied to downlink communication using CA technology.

  The mobile station 100 according to the present embodiment is typically a user apparatus (UE) such as a mobile phone terminal, a smartphone, or a personal computer. The mobile station 100 typically includes one or more of various hardware resources such as an auxiliary storage device, a memory device, a CPU, a communication device, a display device, and an input device. The auxiliary storage device is composed of a hard disk, a flash memory, and the like, and stores programs and data for realizing various processes described later. The memory device is composed of a RAM (Random Access Memory) or the like, and reads and stores the program from the auxiliary storage device when an instruction to start the program is given. The CPU functions as a processor for processing information, and realizes various functions described later according to a program stored in the memory device. The communication device includes various communication circuits for wireless connection with the base station 50 in order to communicate with other devices such as a server via a network. The display device and the input device provide a user interface between the mobile station 100 and the user.

Next, a mobile station according to an embodiment of the present invention will be described with reference to FIGS. The mobile station 100 according to the present embodiment considers the channel type and / or the cell type for each CC to which at least one channel of PUCCH, PUSCH w / UCI, PUSCH w / o UCI, and SRS is assigned by the base station 50. The maximum transmission power P _{cmax, c} that can be used in the CC is determined. Then, the mobile station 100 controls the transmission power of each CC so as not to exceed the determined maximum transmission power P _{cmax, c} , and simultaneously transmits a channel to which a plurality of CCs are assigned.

FIG. 3 is a block diagram showing a configuration of a mobile station according to an embodiment of the present invention. As illustrated in FIG. 3, the mobile station 100 includes an RRC signaling receiver 110, a scheduling information receiver 120, a CA situation determination unit 130, a P _cmax, c_H calculation unit 140, and a P _cmax, c_L calculation. Unit 150 and P _{cmax, c} calculation unit 160.

  The RRC signaling receiving unit 110 receives from the base station 50 various messages for controlling radio resources between the base station 50 and the mobile station 100. Specifically, when CA is applied, the base station 50 sequentially establishes RRC connections for CCs connected to the mobile station 100. The CC in which the RRC connection is first established is called a primary CC (PCC) or a primary cell (Pcell). The CC in which the RRC connection is established after the second is called a secondary CC (SCC) or a secondary cell (Scell). Further, the base station 50 may designate a cell index for each assigned CC and notify the mobile station 100 of the designated cell index. This cell index may be individually specified for each mobile station. In general, the cell index is assigned such that the primary cell of each mobile station is first, followed by the secondary cell. The RRC signaling reception unit 110 provides the received RRC message to the CA status determination unit 130.

  The scheduling information receiving unit 120 receives scheduling information indicating resource blocks and channels allocated to each CC by the base station 50 from the base station 50. Specifically, the scheduling information indicates the allocation status of various channels allocated to the resource blocks of the subframes of each CC. The scheduling information receiving unit 120 provides the received scheduling information to the CA situation analyzing unit 130.

When the CA status determination unit 130 receives the RRC message from the RRC signaling reception unit 110, the CA status determination unit 130 determines which band is assigned as CC by the base station 50 and the RRC connection is established. When the cell index for identifying each CC is received from the base station 50, the CA status determination unit 130 notifies the P _cmax, c_L calculation unit 150 of the cell index. Further, the CA status determination unit 130 provides the scheduling information provided from the scheduling information receiving unit 120 to the P _cmax, c_L calculation unit 150 in order to notify which CC the resource block has been allocated.

The P _cmax, c_H calculation unit 140 calculates the upper limit value P _cmax, c_H of the range of the maximum transmission power P _{cmax, c that} can be transmitted by the mobile station 100 for each CC. Specifically, the P _cmax, c_H calculation unit 140 performs the following for each CC.
P _{cmax, c} — _H = Min {P _EMAX , P _PowerClass }
And the upper limit value P _{cmax, c_H} of the maximum transmission power P _{cmax, c} of the mobile station 100 for each CC is calculated. Here, P _EMAX represents the maximum transmission power of the mobile station 100 in each CC permitted by the base station 50, and P _PowerClass represents the maximum transmission power (such as ₂₃ dBm) that the mobile station 100 can transmit. The present invention is not limited to this, and the upper limit value of the maximum transmission power that can be transmitted by the mobile station 100 is the maximum transmission power permitted by the base station 50 and the maximum transmission power that can be transmitted by the mobile station 100. It only has to be set to a value that does not exceed. The P _cmax, c_H calculation unit 140 notifies the P _{cmax, c_H} determination unit 160 of the calculated P _cmax, c_H.

The P _cmax, c_L calculation unit 150 calculates the lower limit value P _cmax, c_L of the range of the maximum transmission power P _{cmax, c that} can be transmitted by the mobile station 100 for each CC. Specifically, the P _{cmax, c} _L calculation unit 150 performs the following for each CC to which a resource block is allocated.
P _{cmax, c} — L = Min {P _EMAX −ΔT _c , P _PowerClass − (MPR + A−MPR) −ΔT _c }
And P _{cmax, c} _L is calculated. Here, P _EMAX represents the maximum transmission power of the mobile station 100 in each CC permitted by the base station 50, ΔT _c represents an allowable amount of relaxation when using the resource block at the end of the band, P _PowerClass represents the maximum transmission power that can be transmitted by the mobile station 100, MPR (Maximum Power Reduction) represents an allowable mitigation amount determined by the modulation scheme (QPSK, etc.) and the number of resource blocks, and A-MPR ( (Additional Maximum Power Reduction) represents an amount of mitigation that can be tolerated in order not to interfere with other adjacent systems. P _cmax, c _L calculation unit 150 notifies Thus _P was calculated _cmax, the c _L _{P cmax,} the _c calculating unit 160.

The P _{cmax, c} calculation unit 160 is defined by the upper limit value P _cmax, c_H received from the P _cmax, c_H calculation unit 140 and the lower limit value P _cmax, c_L received from the P _cmax, c_L calculation unit 150. Within the range, the maximum transmission power P _{cmax, c} of each CC allocated by the base station 50 is determined. Specifically, the P _{cmax, c} calculation unit 160 determines, for each CC to which a resource block is assigned, the channel type, cell type, and channel type / cell type combination assigned to the CC. The maximum transmission power P _{cmax, c} of each CC is determined.

First, an embodiment will be described in which the P _{cmax, c} calculation unit 160 determines the maximum transmission power P _{cmax, c} according to the channel type. In the present embodiment, the P _{cmax, c} calculator 160 determines the maximum transmission power P _{cmax, c} that can be used for each CC according to the channel priority that defines the priority between the channels. As described above, when various channels are simultaneously transmitted by a plurality of CCs, priority is given to securing transmission power of a channel having a high priority. Generally, a high priority needs to be set for a channel including control information, and priority is given to securing the transmission power. That is, in the present embodiment, the priority of PUCCH is set highest, and the priorities of other channels are appropriately set as follows.
Case 1: PUCCH → PUSCH w / UCI → PUSCH w / o UCI → SRS
Case 2: PUCCH → PUSCH w / UCI → SRS → PUSCH w / o UCI
Case 3: PUCCH → SRS → PUSCH w / UCI → PUSCH w / o UCI
P _{cmax, c} calculation section 160 calculates transmission power necessary for transmitting each channel in order from the channel with the highest priority according to a predetermined channel priority, and calculates the total transmission power and maximum value of each calculated channel. The upper limit value P _{cmax, c_H of the} transmission power P _{cmax, c} is compared. When the total value of the calculated transmission powers of the channels is equal to or less than P _cmax, c_H, the P _{cmax, c} calculation unit 160 calculates the transmission power of the next priority channel. On the other hand, the total value _{P cmax} transmission power of the calculated _channel, if it exceeds c _{_H, P cmax, c} calculating unit _160, the transmission power calculated for the current channel now exceed _{P cmax,} c _H Is scaled by any method so that the total value of the transmission power of the current channel after scaling and the transmission power of each channel before the current channel is equal to or less than the transmission power P _cmax, c_H.

This process can also be rephrased as follows. That is, the P _{cmax, c} calculation unit 160 subtracts the accumulated value of the transmission power of the channel calculated so far according to the channel priority order from the upper limit value P _cmax, c_H and the transmission of the currently calculated channel. When the transmission power of the currently calculated channel exceeds the surplus power by comparing with the power, the transmission power of the currently calculated channel can be expressed as being scaled to be equal to or less than the surplus power.

A specific example of priority order of case 1 will be described. For each CC or cell to which a channel is assigned, P _{cmax, c} calculation section 160 first calculates the transmission power required to transmit the highest priority PUCCH, and calculates the calculated PUCCH transmission power and P _{cmax and} c_H are compared. When the transmission power of the calculated PUCCH exceeds _{P cmax, c _H, P cmax} , c calculating unit _{160, P cmax,} scales the transmit power of the PUCCH so that the following c _H. For example, the PUCCH transmission power may be multiplied by a multiplier (scaling coefficient) smaller than 1 and scaled to be equal to or less than P _{cmax, c} _H.

On the other hand, when the calculated transmission power of the PUCCH is equal to or less than P _cmax, c_H, the P _{cmax, c} calculation unit 160 calculates the transmission power necessary for transmitting the next highest priority PUSCH w / UCI. . Thereafter, the P _{cmax, c} calculation unit 160 calculates a total value of the calculated transmission power of the PUSCH w / UCI and the transmission power of the already calculated PUCCH, and calculates the total value of the transmission power and P _cmax, c_H Compare When the calculated total transmission power value exceeds P _cmax, c_H, P _{cmax, c} calculation unit 160 scales the transmission power of PUSCH w / UCI to be equal to or less than P _cmax, c_H. For example, the transmission power of PUSCH w / UCI is multiplied by a scaling factor smaller than 1, and scaling is performed so that the total value of the scaled transmission power of PUSCH w / UCI and the transmission power of PUCCH is equal to or less than P _{cmax, c} _H. May be. Alternatively, the PUSCH w / UCI transmission power may be simply set to 0, and only the PUCCH may be reliably transmitted.

On the other hand, when the total value of the calculated transmission power is equal to or less than P _cmax, c_H, the P _{cmax, c} calculation unit 160 calculates the transmission power necessary for transmitting the PUSCH w / o UCI having the next highest priority. calculate. Thereafter, the P _{cmax, c} calculation unit 160 calculates a total value of the calculated PUSCH w / o UCI transmission power and the already calculated PUCCH and PUSCH w / UCI transmission power, and calculates the total transmission power value. Compare P _{cmax and c —} H. If the total value of the calculated transmission power exceeds _{P cmax, c _H, P cmax} , c calculating unit _{160, P cmax,} scales the transmit power of PUSCH w / o UCI to be below c _H.

On the other hand, when the total value of the calculated transmission power is equal to or smaller than P _cmax, c_H, the P _{cmax, c} calculation unit 160 calculates the transmission power necessary for transmitting the SRS having the lowest priority. Thereafter, the P _{cmax, c} calculation unit 160 calculates the total value of the calculated transmission power of the SRS and the transmission power of the already calculated PUCCH, PUSCH w / UCI, and PUSCH w / o UCI, and calculates the total of the calculated transmission power. Compare the value with P _{cmax, c —} H. If the total value of the calculated transmission power exceeds _{P cmax, c _H, P cmax} , c calculating unit _{160, P cmax,} it scales the transmit power of the SRS to be below c _H.

On the other hand, when the total value of the calculated transmission power is equal to or smaller than P _cmax, c_H, the P _{cmax, c} calculation unit 160 determines the calculated total value of the transmission power as the maximum transmission power P _{cmax, c} of the CC. .

Of course, the transmission power of the CC determined as the total value of the calculated transmission power is required to be equal to or higher than the lower limit value P _cmax, c_L of the maximum transmission power P _{cmax, c} . It will be understood that the maximum transmission power P _{cmax, c} of the CC can be determined in the same manner for cases 2 and 3. In addition, about the scaling process mentioned above, you may make it apply the same scaling coefficient between CC between the same channels.

Here, the transmission power necessary for transmitting each channel may be calculated using any known calculation method such as a calculation formula defined in TS 36.213 of LTE Release 8. For example, the transmission power of PUSCH may be calculated by using the calculation formula of PUSCH specified in LTE Release 8 and applying this calculation formula to each CC. The transmission power of PUCCH may also be calculated by applying this calculation formula to each CC using the calculation formula of PUCCH defined in LTE Release 8. Similarly, SRS transmission power may be calculated by adding an offset P _{SRS_OFFSET, c} to the PUSCH transmission power calculation formula. However, the present invention is not limited to this, and any other suitable calculation method of PUCCH, PUSCH, and SRS can be applied.

Here, regarding the transmission of the SRS, as shown in FIG. 4, when the SRS is transmitted, other channels may not be transmitted. In general, since the SRS is transmitted in the last symbol of the subframe or the like, the maximum transmission power P _{cmax, c} of each CC to which the SRS is assigned may be determined as follows. That is, based on the multiplexing status of various channels, P _{cmax, c} calculation section 160 may determine maximum transmission power P _{cmax, c} for each symbol included in the subframe. Specifically, for the CC to which the SRS is assigned, the P _{cmax, c} calculation unit 160 determines the transmission power for transmitting the symbol to which the SRS is assigned and the symbols to which the other PUCCH and PUSCH are assigned. The transmission power for transmission may be calculated separately, and the maximum transmission power P _{cmax, c} that is different for each symbol may be set. That is, both P _{cmax, c} for PUSCH and PUCCH and P _{cmax, c} for SRS may be set. On the other hand, the P _{cmax, c} calculation unit 160 may determine the maximum transmission power P _{cmax, c} for the entire subframe. Specifically, for the CC to which the SRS is assigned, the P _{cmax, c} calculation unit 160 determines the transmission power for transmitting the symbol to which the SRS is assigned and the symbols to which the other PUCCH and PUSCH are assigned. The transmission power for transmission may be calculated separately, and a larger value of the two calculated transmission powers may be set as the maximum transmission power P _{cmax, c} of the subframe. In addition, scaling may be performed as necessary, and the transmission power after scaling may be set as the maximum transmission power P _{cmax, c} . However, it should be noted that the transmission power of the PUCCH is not scaled to a value that is insufficient to transmit the PUCCH.

Next, an embodiment in which the P _{cmax, c} calculation unit 160 determines the maximum transmission power P _{cmax, c} according to the cell type will be described. In this embodiment, the P _{cmax, c} calculation unit 160 determines the maximum transmission power P _{cmax that} can be used for each CC depending on whether the CC or cell is a primary cell (Pcell) or a secondary cell (Scell). _{, C.} LTE-Advanced in the method, the maximum transmission power _{P cmax} of the CC resource blocks are allocated by the base _station, when determining the _c, maximum transmission power _{P cmax,} the maximum transmission power transmission capable of _c is the mobile station of each CC It is required not to exceed P _PowerClass . Furthermore, it is assumed that the total value of the maximum transmission power P _{cmax, c} of all CCs to which the resource block is allocated is required not to exceed the maximum transmission power P _PowerClass that can be transmitted by the mobile station. In this case, it is necessary to consider how to allocate the maximum transmission power of each cell within a range that does not exceed the maximum transmission power P _PowerClass that can be transmitted by the mobile station.

  In this embodiment, transmission power is preferentially allocated to a primary cell that is a CC or a cell that is first connected among a plurality of CCs, compared to a secondary cell that is a CC or a cell that is subsequently connected. Is done. Further, when the base station allocates resource blocks to a plurality of secondary cells, the transmission power is distributed among the secondary cells according to any priority order. For example, when the cell index of each cell is acquired from the base station 50 via the RRC signaling receiver 110 as the priority between the secondary cells, the priority may be set according to the order of the cell index. Further, the priority order may be set according to the magnitude of the path loss between the base station 50 and the mobile station 100. That is, a higher priority may be set for a secondary cell with a small path loss and a good communication state. In this case, it is possible to reliably transmit a signal transmitted by the secondary with a small path loss and a relatively small required transmission power. On the other hand, a higher priority may be set for a secondary cell with a large path loss. In this case, a signal transmitted by a secondary cell having a large path loss and a relatively large required transmission power can be transmitted better.

FIG. 5 is a flowchart illustrating an exemplary process for determining the maximum transmission power in a mobile station according to an embodiment of the present invention. In the illustrated embodiment, the mobile station 100 determines the maximum transmit power P _{cmax, c} that can be transmitted for each CC to which the resource block is allocated in accordance with the priority order of case 1 described above.

As shown in FIG. 5, when a resource block is allocated from the base station 50, the mobile station 100 starts a process for determining the maximum transmission power P _{cmax, c} of the CC to which the resource block is allocated.

In step S101, the mobile station 100 determines the maximum transmission power P _{cmax, c} that can be used for each CC based on the RRC message received from the base station 50 and the scheduling information, and thus the upper limit value of the maximum transmission power P _{cmax, c} . P _cmax, c _H and the lower limit value _{P cmax,} various parameters of the calculation formula, such as c _L such as initialization, executes initialization processing.

In step S102, the P _{cmax, c} calculation unit 160 calculates the transmission power of the PUCCH having the highest priority according to the processing as illustrated in FIGS.

In step S103, the P _{cmax, c} calculation unit 160 calculates the transmission power of the PUSCH w / UCI having the next highest priority according to the process as shown in FIG.

In step S104, the P _{cmax, c} calculation unit 160 calculates the transmission power of the PUSCH w / o UCI having the next highest priority according to the process as shown in FIG.

In step S105, the P _{cmax, c} calculation unit 160 calculates the transmission power of the SRS having the lowest priority according to the process as shown in FIG.

In step S106, the P _{cmax, c} calculation unit 160 determines the maximum transmission power P _{cmax, c} based on the transmission power calculated for PUCCH, PUSCH w / UCI, PUSCH w / o UCI, and SRS. In a case where the total value of the maximum transmission powers P _{cmax, c} of all CCs to which the resource block is allocated is required not to exceed the maximum transmission power that can be transmitted by the mobile station, the determined maximum transmission power P _{If cmax, c} is less than the upper limit value P _cmax, c_H and there is a CC with surplus transmission power, this surplus transmission power may be equally distributed to other CCs.

  Next, the PUCCH transmission power calculation process corresponding to step S102 of FIG. 5 will be described in more detail with reference to FIGS.

  FIG. 6 is a flowchart showing an exemplary process for determining the transmission power of the PUCCH in the mobile station according to an embodiment of the present invention. This process corresponds to step S102 of FIG. 5, and is a process for a case where the PUCCH is assigned only to the primary cell.

In step S _<b> 201, the P _{cmax, c} calculation unit 160 executes an initialization process based on the RRC message and scheduling information received from the base station 50. For example, the P _{cmax, c} calculation unit 160 initializes various parameters of the calculation formula of the transmission power P _PUCCH of the _PUCCH based on the received RRC message and scheduling information.

In step S202, the P _{cmax, c} calculation unit 160 determines whether a PUCCH is assigned to the primary cell based on the received scheduling information. When PUCCH is allocated to the primary cell, the process moves to step S203, and further process for determining the transmission power of PUCCH is performed. On the other hand, when the PUCCH is not assigned to the primary cell, the process ends, and the process proceeds to step S103 in FIG.

In step S203, P _{cmax, c} calculation section 160 calculates transmission power P _{PUCCH_Pcell} necessary for transmitting the PUCCH assigned to the primary cell, according to a calculation formula for deriving the transmission power of a predetermined PUCCH. .

In step S204, the P _{cmax, c} calculation unit 160 determines whether the calculated P _{PUCCH_Pcell} is less than the upper limit value P _{cmax, c_H} . When the calculated P _{PUCCH_Pcell} is less than the upper limit value P _{cmax, c_H} , the process proceeds to step S205. When the calculated P _{PUCCH_Pcell} is not less than the upper limit value P _{cmax, c_H} , the process proceeds to step S206. Transition.

In step S205, the P _{cmax, c} calculation unit 160 determines _{whether the} calculated P _{PUCCH_Pcell satisfies a} predetermined transmission power request ( _Unknown emission requirements). This transmission power request may be, for example, whether or not the calculated P _{PUCCH_Pcell} is less than or equal to a power level that ensures that there is no possibility of causing interference to other systems. When the calculated P _{PUCCH_Pcell} satisfies the predetermined transmission power request, the process _proceeds to step S207. When the calculated P _{PUCCH_Pcell} does not satisfy the predetermined transmission power request, the process _proceeds to step S206.

In step S _<b> 206, the P _{cmax, c} calculation unit 160 sets the calculated P _{PUCCH_Pcell} to the maximum transmission power allowed for the mobile station 100. Maximum transmission power allowed to the mobile station 100, if the maximum transmission power _{P cmax} of each _{CC, c} that does not exceed the maximum transmittable transmit power _{P PowerClass} mobile station is _requested, the _{P PowerClass} It may be set. Further, when it is required that the total value of the maximum transmission power P _{cmax, c} of all CCs to which the resource block is allocated does not exceed the maximum transmission power P _PowerClass that can be transmitted by the mobile station, the mobile station 100 The allowable maximum transmission power may be set to any appropriate value such that the total value of P _{cmax, c} does not exceed the maximum transmission power P _PowerClass that can be transmitted by the mobile station.

In step S207, P _{cmax, c} calculation section 160 sets the calculated P _{PUCCH_Pcell} as PUCCH transmission power P _PUCCH . Thereafter, the process ends, and the process proceeds to step S103 in FIG.

FIG. 7 is a flowchart showing another example process for determining the transmission power of the PUCCH in the mobile station according to one embodiment of the present invention. This process corresponds to step S102 in FIG. 5, and is a process for a case where the PUCCH is assigned not only to the primary cell but also to the secondary cell. In this case, P _{cmax, c} calculation section 160 determines _PUCCH transmission power P _PUCCH in consideration of not only the channel type but also the cell type.

In step S301, the P _{cmax, c} calculation unit 160 executes an initialization process based on the RRC message and scheduling information received from the base station 50. For example, the P _{cmax, c} calculation unit 160 initializes various parameters of a calculation formula for calculating the transmission power P _{PUCCH of the} PUCCH based on the received RRC message and scheduling information.

In step S302, P _{cmax, c} calculation section 160 determines whether PUCCH is assigned to the primary cell based on the received scheduling information. When the PUCCH is assigned to the primary cell, the process moves to step S303, and a further process for determining the transmission power of the PUCCH is performed. On the other hand, when the PUCCH is not assigned to the primary cell, the process proceeds to step S308 in order to process the case where the PUCCH is assigned to the secondary cell.

In step S303, P _{cmax, c} calculation section 160 calculates transmission power P _{PUCCH_Pcell} necessary for transmitting the PUCCH assigned to the primary cell, according to a predetermined PUCCH transmission power calculation formula.

In step S304, the P _{cmax, c} calculation unit 160 determines whether the calculated P _{PUCCH_Pcell} is less than the upper limit value P _{cmax, c_H} . If the calculated P _{PUCCH_Pcell} is less than the upper limit value P _{cmax, c_H} , the process proceeds to step S305. If the calculated P _{PUCCH_Pcell} is not less than the upper limit value P _{cmax, c_H} , the process proceeds to step S306. Transition.

In step S305, the P _{cmax, c} calculation unit 160 determines whether or not the calculated P _{PUCCH_Pcell satisfies a} predetermined transmission power request (Unwanted emission requirements). This transmission power request may be, for example, whether or not the calculated P _{PUCCH_Pcell} is less than or equal to a power level that ensures that there is no possibility of causing interference to other systems. When the calculated P _{PUCCH_Pcell} satisfies the predetermined transmission power request, the process _proceeds to step S307. When the calculated P _{PUCCH_Pcell} does not satisfy the predetermined transmission power request, the process _proceeds to step S306.

In step S _<b> 306, the P _{cmax, c} calculation unit 160 sets the calculated P _{PUCCH_Pcell} to the maximum transmission power allowed for the mobile station 100.

In step S307, P _{cmax, c} calculation section 160 sets the calculated P _{PUCCH_Pcell} as PUCCH transmission power P _PUCCH .

In step S308, P _{cmax, c} calculation section 160 first sorts the secondary cells according to a predetermined selection criterion in order to determine the transmission power of PUCCH allocated to one or more secondary cells. As described above, the base station 50 notifies the mobile station 100 of the cell index for identifying each CC or cell assigned to the mobile station 100 using the RRC message. The P _{cmax, c} calculation unit 160 may sort the secondary cells to which the resource block is allocated according to the ascending order or descending order of the cell index. In addition, the P _{cmax, c} calculation unit 160 assigns resource blocks in ascending or descending order of path loss based on the path loss of each cell between the base station 50 and the mobile station 100 acquired by any method. Cells may be sorted. Thereafter, the P _{cmax, c} calculation unit 160 calculates the total number N of each sorted secondary cell and initializes the secondary cell index i to 0.

In step S309, P _{cmax, c} calculation section 160 calculates PUCCH transmission power P _{PUCCH_Scell_i} in accordance with a predetermined PUCCH transmission power calculation formula for each secondary cell i to which the resource block is allocated.

In step S310, P _{cmax, c} calculation section 160 determines whether or not PUCCH is assigned to the secondary cell (referred to as secondary cell i) corresponding to secondary cell index i. When the PUCCH is assigned to the secondary cell i, the process moves to step S311. When the PUCCH is not assigned to the secondary cell i, the process moves to step S315.

In step S311, the P _{cmax, c} calculation unit 160 determines the PUCCH transmission power P _{PUCCH_Scell_i} calculated for the secondary cell i from the upper limit value P _{cmax, c_H} of the PUCCH assigned to the primary cell determined in step S307. It is determined whether or not the transmission power P _{PUCCH_Pcell} is less than the surplus power after subtraction. If the calculated P _{PUCCH_Scell_i} is less than the surplus power, the process _proceeds to step S312. If the calculated P _{PUCCH_Scell_i} is not less than the surplus power, the process _proceeds to step S313.

In step _{S312, P cmax, c} calculating unit 160, the calculated _{P PUCCH_Scell_i} is, the PUCCH transmission power _{P PUCCH_Pcell} allocated to primary cells that are already determined in consideration of a predetermined transmission power requirement (Unwanted emission requirements) Judgment is satisfied. This transmission power request may be, for example, whether or not the total transmission power of P _{PUCCH_Scell_i} and P _{PUCCH_Pcell} is less than or equal to a power level that ensures that there is no risk of causing interference to other systems. When the calculated P _{PUCCH_Scell_i} satisfies the predetermined transmission power request, the process proceeds to step S314. When the calculated P _{PUCCH_Scell_i} does not satisfy the predetermined transmission power request, the process proceeds to step S313.

In step S313, the P _{cmax, c} calculation unit 160 sets the calculated P _{PUCCH_Scell_i} to the maximum transmission power allowed by the mobile station 100.

In step S314, the P _{cmax, c} calculation unit 160 increments the secondary cell index i by 1.

In step S315, the P _{cmax, c} calculation unit 160 determines whether the updated secondary cell index i has reached the total number N of secondary cells to which the resource block is allocated. When the updated secondary cell index i reaches the total number N of secondary cells to which resource blocks are allocated, the P _{cmax, c} calculation unit 160 executes a process of calculating PUCCH transmission power for all the secondary cells. The process proceeds to step S316. On the other hand, when the updated secondary cell index i has not reached the total number N of secondary cells to which the resource block is allocated, the P _{cmax, c} calculation unit 160 does not execute the process of calculating the PUCCH transmission power. It is determined that there is a cell, the process returns to step S310, and the above-described processing is repeated.

In step S316, the P _{cmax, c} calculation unit 160 transmits the transmission power P _{PUCCH_Pcell of the} PUCCH allocated to the primary cell calculated in step S307 and the PUCCH allocated to the secondary cell i calculated for the secondary cell i. obtains the total value of the power _{P PUCCH_Scell_i,} if the total value exceeds the upper limit value _{P cmax} _H the maximum transmission power _{P cmax} can transmit the mobile station 100 in the _uplink, by scaling _{P PUCCH_Scell_i,} the scaled P total value of _{PUCCH_Scell_i} and _{P PUCCH_Pcell} is set to be equal to or less than the upper limit value _{P cmax} _H.

This scaling can be performed in several ways. For example, all resource blocks are allocated sum of the _{P PUCCH_Pcell} and _{P PUCCH_Scell_i} calculates the scaling factor X a _{P PUCCH_Scell_i} such that less than the upper limit value _{P cmax} _H to the secondary cell, for all secondary cells The maximum transmission power P _{PUCCH_Scell_i} may be multiplied by a common scaling factor X for scaling. Moreover, as the path loss between the base station 50 and the mobile station 100 sets the maximum transmission power _{P PUCCH_Scell_i} large secondary cell to _0, the sum of _{P PUCCH_Pcell} and _{P PUCCH_Scell_i} falls below the upper limit value _{P cmax} _H It may be. On the other hand, as the path loss between the base station 50 and the mobile station 100 is the maximum transmission power _{P PUCCH_Scell_i} small secondary cell is set to _0, the sum of _{P PUCCH_Pcell} and _{P PUCCH_Scell_i} falls below the upper limit value _{P cmax} _H It may be. In addition, the transmission power of a secondary cell in which the difference between the maximum transmission power and P _{PUCCH_Scell_i} is _equal to or greater than a predetermined threshold may be set to 0 as compared to the cell with the maximum transmission power. Alternatively, when the target secondary cell has a power equal to or lower than a predetermined threshold value compared to a cell having a transmission power larger than this and closest, the transmission power may be set to zero.

  Thereafter, the process ends, and the process proceeds to step S103 in FIG. Thus, in the process according to the present embodiment, when the PUCCH is assigned to the primary cell and the secondary cell, it becomes possible to preferentially transmit the PUCCH of the primary cell.

  Next, the PUSCH w / UCI transmission power calculation process corresponding to step S104 of FIG. 5 will be described in more detail with reference to FIG.

In step S401, the P _{cmax, c} calculation unit 160 executes an initialization process based on the RRC message and scheduling information received from the base station 50. For example, the P _{cmax, c} calculation unit 160 initializes various parameters of a calculation formula for calculating the transmission power P _{PUSCH_UCI} of PUSCH w / UCI based on the received RRC message and scheduling information.

In step S402, the P _{cmax, c} calculation unit 160 first determines the PUSCH w / UCI transmission power P _{PUSCH_UCI_i} of one or more cells i to which the resource block is allocated. Sort according to selection criteria. As described above, the base station 50 notifies the mobile station 100 of the cell index for identifying each CC or cell assigned to the mobile station 100 using the RRC message. The P _{cmax, c} calculation unit 160 may sort the cells to which the resource block is allocated according to the ascending order or descending order of the cell index. In addition, the P _{cmax, c} calculation unit 160 is a cell to which resource blocks are allocated in ascending or descending order of path loss based on the path loss of each cell between the base station 50 and the mobile station 100 acquired by any method. May be sorted. The P _{cmax, c} calculation unit 160 calculates the total number N of the sorted cells and initializes the cell index i to 0.

In step S403, P _{cmax, c} calculation section 160 calculates PUSCH w / UCI transmission power P _{PUSCH_UCI_i} for each cell i to which a resource block is allocated, according to a predetermined PUSCH transmission power calculation formula.

In step S404, the P _{cmax, c} calculation unit 160 determines whether PUSCH w / UCI is assigned to a cell (referred to as cell i) corresponding to the cell index i. When PUSCH w / UCI is assigned to cell i, the process proceeds to step S405. When PUSCH w / UCI is not assigned to cell i, the process proceeds to step S409.

In step S405, the P _{cmax, c} calculation unit 160 transmits the PUSCH w / UCI transmission power P _{PUSCH_UCI_i} calculated for the cell i from the upper limit value P _{cmax, c_H} in step S102 of FIG. It is determined whether the power is less than the surplus power after subtracting power P _PUCCH . If the calculated P _{PUSCH_UCI_i} is less than the surplus power, the process proceeds to step S406. If the calculated P _{PUSCH_UCI_i} is not less than the surplus power, the process proceeds to step S407.

In step S406, the P _{cmax, c} calculation unit 160 determines _{whether the} calculated P _{PUSCH_UCI_i} satisfies a predetermined transmission power request (Unwanted emission requirements) in consideration of the transmission power P _PUCCH of the already determined PUCCH. To do. This transmission power request may be, for example, a request that the total transmission power of P _{PUSCH_UCI_i} and P _PUCCH is equal to or lower than a power level that ensures that there is no possibility of causing interference to other systems. If the calculated P _{PUSCH_UCI_i} satisfies the predetermined transmission power request, the process _proceeds to step S408. If the calculated P _{PUSCH_UCI_i} does not satisfy the predetermined transmission power request, the process _proceeds to step S407.

In step S407, the P _{cmax, c} calculation unit 160 sets the calculated P _{PUSCH_UCI_i} to the maximum transmission power allowed for the mobile station 100.

In step S408, P _{cmax, c} calculation unit 160 increments cell index i by one.

In step S409, the P _{cmax, c} calculation unit 160 determines whether the updated cell index i has reached the total number N of cells to which resource blocks are allocated. When the updated cell index i reaches the total number N of cells to which resource blocks are allocated, the P _{cmax, c} calculation unit 160 executes a process of calculating PUSCH w / UCI transmission power for all cells. The process proceeds to step S410. On the other hand, when the updated cell index i has not reached the total number N of cells to which the resource block is allocated, the P _{cmax, c} calculation unit 160 has not executed the process of calculating PUSCH w / UCI transmission power. It is determined that there is a cell, the process returns to step S404, and the above-described processing is repeated.

In step S410, the P _{cmax, c} calculation unit 160 _obtains a total value P _{PUSCH_UCI} of the calculated PUSCH w / UCI transmission power P _{PUSCH_UCI_i} , and calculates the PUCCH transmission power P _PUCCH and P _{PUSCH_UCI} calculated in step S102 of FIG. And find the total value. If the total value of the P _PUCCH and _{P PUSCH_UCI} exceeds the upper limit value _{P cmax} _H the maximum transmission power _{P cmax} can transmit the mobile station 100 in the _uplink, by scaling _{P PUSCH_UCI,} the scaled _{P PUSCH_UCI} and _{P PUCCH} Is set to be equal to or lower than the upper limit value P _{cmax_H} .

This scaling can be performed in several ways. For example, to calculate a scaling factor X to _{P PUSCH_UCI} such as the sum of the _{P PUCCH} and _{P PUSCH_UCI} for all cells that resource blocks are allocated is less than the upper limit value _{P cmax} _H, maximum transmission of all cells The power P _{PUSCH_UCI} may be multiplied by a common scaling factor X for scaling. Also, the maximum transmission power _{P PUSCH_UCI_i} path loss of a large cell between the base station 50 and the mobile station 100 is set to _0, so the sum of the _{P PUCCH} and _{P PUSCH_UCI} falls below the upper limit value _{P cmax} _H May be. On the other hand, as the path loss between the base station 50 and the mobile station 100 is the maximum transmission power _{P PUSCH_UCI_i} small secondary cell is set to _0, the sum of _{P PUCCH} and _{P PUSCH_UCI} falls below the upper limit value _{P cmax} _H It may be. In addition, the transmission power of a cell in which the difference between the maximum transmission power and P _{PUSCH_UCI_i} is _equal to or greater than a predetermined threshold may be set to 0, compared to a cell with the maximum transmission power. Alternatively, when the target cell has a power that is equal to or lower than a predetermined threshold value compared to the cell having a transmission power that is larger and closest to the target cell, the transmission power may be set to zero.

  Thereafter, the process ends, and the process proceeds to step S104 in FIG. In this way, in the processing according to the present embodiment, it is possible to transmit PUSCH w / UCI using the remaining power while preferentially transmitting the already determined PUCCH. Thereafter, the process ends, and the process proceeds to step S104 in FIG.

  Next, referring to FIG. 9, the PUSCH w / o UCI transmission power calculation process corresponding to step S104 in FIG. 5 will be described in more detail.

In step S501, the P _{cmax, c} calculation unit 160 executes an initialization process based on the RRC message and scheduling information received from the base station 50. For example, the P _{cmax, c} calculation unit 160 initializes various parameters of a calculation formula for calculating the transmission power P _{PUSCH_UCI_cell} of PUSCH w / o UCI based on the received RRC message and scheduling information.

In step S502, the P _{cmax, c} calculation unit 160 first determines a cell to which the resource block is assigned in order to determine the PUSCH w / o UCI transmission power P _{PUSCH_cell_i} of one or more cells i to which the resource block is assigned. Sort according to the selection criteria. As described above, the base station 50 notifies the mobile station 100 of the cell index for identifying each CC or cell assigned to the mobile station 100 using the RRC message. The P _{cmax, c} calculation unit 160 may sort the cells to which the resource block is allocated according to the ascending order or descending order of the cell index. In addition, the P _{cmax, c} calculation unit 160 is a cell to which resource blocks are allocated in ascending or descending order of path loss based on the path loss of each cell between the base station 50 and the mobile station 100 acquired by any method. May be sorted. The P _{cmax, c} calculation unit 160 calculates the total number N of the sorted cells and initializes the cell index i to 0.

In step S503, the P _{cmax, c} calculation unit 160 calculates PUSCH w / o UCI transmission power P _{PUSCH_cell_i} according to a predetermined PUSCH transmission power calculation formula for each cell i to which a resource block is allocated.

In step S504, P _{cmax, c} calculation section 160 determines whether or not PUSCH w / o UCI is assigned to the cell corresponding to cell index i (referred to as cell i). If the PUSCH w / o UCI is assigned to the cell i, the process proceeds to step S505. If the PUSCH w / o UCI is not assigned to the cell i, the process proceeds to step S509.

In step S505, the P _{cmax, c} calculator 160 determines the PUSCH w / o UCI transmission power P _{PUSCH_cell_i} calculated for the cell i from the upper limit value P _{cmax, c_H} of the PUCCH determined in step S102 of FIG. It is determined whether the power is less than the surplus power after subtracting the total value of the transmission power P _PUCCH and the transmission power P _{PUSCH_UCI} of PUSCH w / UCI determined in step S103. When the calculated P _{PUSCH_cell_i} is less than the surplus power, the process proceeds to step S506. When the calculated P _{PUSCH_cell_i} is not less than the surplus power, the process proceeds to step S507.

In step S506, the P _{cmax, c} calculation unit 160 determines that the calculated P _{PUSCH_cell_i} is a predetermined value in consideration of the total value of the transmission power P _{PUCCH of the} previously determined _PUCCH and the transmission power P _{PUSCH_UCI} of the PUSCH w / UCI. It is determined whether a transmission power request (Unwanted emission requirements) is satisfied. This transmission power request may be, for example, a request that the total transmission power of P _{PUSCH_cell_i} , P _PUCCH, and P _{PUSCH_UCI} is equal to or lower than a power level that ensures that there is no possibility of causing interference to other systems. When the calculated P _{PUSCH_cell_i} satisfies the predetermined transmission power request, the process _proceeds to step S508. When the calculated P _{PUSCH_cell_i} does not satisfy the predetermined transmission power request, the process _proceeds to step S507.

In step S507, the P _{cmax, c} calculation unit 160 sets the calculated P _{PUSCH_cell_i} to the maximum transmission power allowed by the mobile station 100.

In step S508, the P _{cmax, c} calculation unit 160 increments the cell index i by 1.

In step S509, the P _{cmax, c} calculation unit 160 determines whether the updated cell index i has reached the total number N of cells to which resource blocks are allocated. When the updated cell index i reaches the total number N of cells to which resource blocks are allocated, the P _{cmax, c} calculation unit 160 performs a process of calculating PUSCH w / o UCI transmission power for all cells. It is determined that it has been executed, and the process proceeds to step S510. On the other hand, when the updated cell index i has not reached the total number N of cells to which resource blocks are allocated, the P _{cmax, c} calculation unit 160 is executing processing for calculating the transmission power of PUSCH w / o UCI. It is determined that there is no cell, and the process returns to step S504 to repeat the above-described processing.

In step S510, the P _{cmax, c} calculation unit 160 _obtains the total transmission value P _{PUSCH_cell} of the calculated PUSCH w / o UCI transmission power P _{PUSCH_cell_i} , and calculates the transmission power P _{PUCCH of the} PUCCH calculated in step S102 of FIG. The sum of the transmission powers P _{PUSCH_UCI} and P _{PUSCH_cell} of PUSCH w / UCI determined in S103 is obtained. If the sum exceeds the upper limit value _{P cmax} _H the maximum transmission power _{P cmax} that can be transmitted in the mobile station 100 uplink scales _{the P PUSCH_cell,} the scaled _{P PUSCH_cell,} the sum of _{P PUCCH} and _{P PUSCH_UCI} Is less than or equal to the upper limit value P _{cmax_H} . This scaling can be performed in the same manner as the scaling method of _{PPUSCH_UCI} described above.

  In this way, in the processing according to the present embodiment, it is possible to transmit the PUSCH w / o UCI using the remaining power while preferentially transmitting the already determined PUCCH and PUSCH w / UCI. Thereafter, the process ends, and the process proceeds to step S105 in FIG.

  Next, the SRS transmission power calculation process corresponding to step S105 of FIG. 5 will be described in more detail with reference to FIG.

In step S601, the P _{cmax, c} calculation unit 160 executes an initialization process based on the RRC message and scheduling information received from the base station 50. For example, the P _{cmax, c} calculation unit 160 initializes various parameters of a calculation formula for calculating the transmission power P _{SRS_cell of the} SRS based on the received RRC message and scheduling information.

In step S602, the P _{cmax, c} calculation unit 160 first determines the SRS transmission power P _{SRS_cell_i} of one or more cells i to which the resource block is allocated according to a predetermined selection criterion. Sort. As described above, the base station 50 notifies the mobile station 100 of the cell index for identifying each CC or cell assigned to the mobile station 100 using the RRC message. The P _{cmax, c} calculation unit 160 may sort the cells to which the resource block is allocated according to the ascending order or descending order of the cell index. In addition, the P _{cmax, c} calculation unit 160 is a cell to which resource blocks are allocated in ascending or descending order of path loss based on the path loss of each cell between the base station 50 and the mobile station 100 acquired by any method. May be sorted. The P _{cmax, c} calculation unit 160 calculates the total number N of the sorted cells and initializes the cell index i to 0.

In step S603, the P _{cmax, c} calculation unit 160 calculates SRS transmission power P _{SRS_cell_i} according to a predetermined SRS transmission power calculation formula for each cell i to which the resource block is allocated.

In step S604, P _{cmax, c} calculation unit 160 determines whether or not an SRS is assigned to a cell corresponding to cell index i (referred to as cell i). When the SRS is assigned to the cell i, the process moves to step S605. When the SRS is not assigned to the cell i, the process moves to step S609.

In step S605, the P _{cmax, c} calculation unit 160 determines that the transmission power P _{SRS_cell_i of the} SRS calculated for the cell i is determined from the upper limit value P _{cmax, c_H} in step S102 of FIG. 5 in the PUCCH transmission power P _PUCCH. Then, it is determined whether the power is less than the surplus power after subtracting the total value of the transmission power _{PPUSCH_UCI} of PUSCH w / UCI determined in step S103 and the transmission power _{PPUSCH_cell} of PUSCH w / o UCI determined in step S104. If the calculated P _{SRS_cell_i} is less than the surplus power, the process _proceeds to step S606. If the calculated P _{SRS_cell_i} is not less than the surplus power, the process _proceeds to step S607.

In step S606, the P _{cmax, c} calculation unit 160 determines that the calculated P _{SRS_cell_i} is the transmission power P _PUCCH , PUSCH w / UCI transmission power P _{PUSCH_UCI} and PUSCH w / o UCI transmission power P that has already been determined. _{In consideration} of the total value of _{PUSCH_cell} , it is determined whether a predetermined transmission power requirement (Unwanted emission requirements) is satisfied. This transmission power request is, for example, a request that the total transmission power of P _{SRS_cell_i} , P _PUCCH , P _{PUSCH_UCI} and P _{PUSCH_cell} is below a power level that ensures that there is no risk of causing interference to other systems. Also good. When the calculated P _{SRS_cell_i} satisfies the predetermined transmission power request, the process _proceeds to step S608. When the calculated P _{SRS_cell_i} does not satisfy the predetermined transmission power request, the process _proceeds to step S607.

In step S _<b> 607, the P _{cmax, c} calculation unit 160 sets the calculated P _{SRS_cell_i} to the maximum transmission power allowed by the mobile station 100.

In step S608, the P _{cmax, c} calculation unit 160 increments the cell index i by 1.

In step S609, the P _{cmax, c} calculation unit 160 determines whether the updated cell index i has reached the total number N of cells to which resource blocks are allocated. When the updated cell index i reaches the total number N of cells to which resource blocks are allocated, the P _{cmax, c} calculation unit 160 determines that the process of calculating the SRS transmission power has been performed for all cells. Then, the process proceeds to step S610. On the other hand, when the updated cell index i has not reached the total number N of cells to which resource blocks are allocated, the P _{cmax, c} calculation unit 160 includes a cell for which processing for calculating the transmission power of the SRS has not been performed. Then, the process returns to step S604, and the above-described processing is repeated.

In step S610, the P _{cmax, c} calculation unit 160 _obtains the total value P _{SRS_cell} of the calculated transmission power P _{SRS_cell_i} of the SRS, and is determined in step S103, the transmission power P _{PUCCH of the} PUCCH calculated in step S102 of FIG. The PUSCH w / UCI transmission power P _{PUSCH_UCI} and the PUSCH w / o UCI transmission power P _{PUSCH_cell} and P _{SRS_cell} determined in step S104 are _obtained . If the sum exceeds the upper limit value _{P cmax} _H the maximum transmission power _{P cmax} that can be transmitted in the mobile station 100 uplink scales _{the P SRS_cell,} the scaled _{P SRS_cell, P} PUCCH, _{P PUSCH_UCI} and _{P PUSCH_cell} Is set to be equal to or lower than the upper limit value P _cmax —H. This scaling can be performed in the same manner as the scaling method of P _{PUSCH_UCI} and P _{PUSCH_cell} described above.

  In this way, in the processing according to the present embodiment, it is possible to transmit SRS using surplus power while preferentially transmitting the previously determined PUCCH, PUSCH w / UCI, and PUSCH w / o UCI. Become. Thereafter, the process ends, and the process proceeds to step S106 in FIG.

  In the above-described embodiment, the priority order of case 1 has been described. However, it will be easily understood by those skilled in the art that the processing for the priority orders of cases 2 and 3 can be similarly executed.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to embodiment mentioned above, In the range of the summary of this invention described in the claim, various deformation | transformation / change Is possible.

10 wireless communication system 50 base station 100 mobile station

Claims (5)

A mobile station used in a wireless communication system using carrier aggregation,
A control signal receiving unit for receiving a control signal indicating a plurality of channels allocated to be simultaneously transmitted by the mobile station using a plurality of component carriers;
Maximum transmission power for transmitting each of the plurality of component carriers based on the calculated transmission power of the plurality of channels, by calculating transmission power for transmitting the plurality of channels allocated to the plurality of component carriers A maximum transmission power calculation unit for calculating
Have
The maximum transmission power calculation unit is configured to ensure the transmission power for transmitting a channel having a higher priority among the plurality of channels according to a predetermined channel priority assigned to a control channel with the highest priority. A mobile station that determines power.   The maximum transmission power calculation unit sequentially calculates transmission power for transmitting the plurality of channels according to the predetermined channel priority, and the accumulated value of the calculated transmission power exceeds the upper limit value of the maximum transmission power. The mobile station according to claim 1, wherein the transmission power calculated for a channel having a low channel priority is scaled so as to be equal to or less than the upper limit value. The plurality of channels include a reference channel transmitted using the entire bandwidth of each component carrier;
The maximum transmission power calculation unit is configured to transmit a symbol for transmitting the reference channel independently of transmission power for a symbol for transmitting a channel excluding the reference channel of the plurality of channels among the component carriers. The mobile station according to claim 1 or 2, wherein power is determined. The plurality of channels include a reference channel transmitted using the entire bandwidth of each component carrier;
The maximum transmission power calculation unit calculates and calculates transmission power for transmitting a channel excluding the reference channel of the plurality of channels and transmission power for transmitting the reference channel among the component carriers. The mobile station according to claim 1 or 2, wherein the maximum transmission power is determined based on a large transmission power of the two transmission powers. A method used in a wireless communication system using carrier aggregation,
A base station transmitting a control signal indicating a plurality of channels allocated to be simultaneously transmitted by a mobile station using a plurality of component carriers;
The mobile station receiving the control signal;
The mobile station calculating transmission power for transmitting a plurality of channels allocated to the plurality of component carriers;
Calculating the maximum transmission power for the mobile station to transmit each of the plurality of component carriers based on the calculated transmission power of the plurality of channels;
Have
The step of calculating the maximum transmission power includes securing a transmission power for transmitting a channel with a higher priority among the plurality of channels according to a predetermined channel priority assigned to a control channel with the highest priority. A method for determining the maximum transmit power.

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