WO2019026831A1 - ユーザ装置及び基地局装置 - Google Patents
ユーザ装置及び基地局装置 Download PDFInfo
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- WO2019026831A1 WO2019026831A1 PCT/JP2018/028414 JP2018028414W WO2019026831A1 WO 2019026831 A1 WO2019026831 A1 WO 2019026831A1 JP 2018028414 W JP2018028414 W JP 2018028414W WO 2019026831 A1 WO2019026831 A1 WO 2019026831A1
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- Prior art keywords
- transmission power
- user apparatus
- antenna
- base station
- gain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/365—Power headroom reporting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Definitions
- the present invention relates to a user apparatus and a base station apparatus in a wireless communication system.
- 5G or NR New Radio
- 5G In 3GPP (3rd Generation Partnership Project), 5G or NR (New Radio) is required to realize further increase in system capacity, further increase in data transmission speed, and further reduction in delay in a wireless section.
- Investigation of a called wireless communication system (hereinafter, the wireless communication system is referred to as "5G” or "NR”) is in progress.
- 5G in order to meet the requirement of reducing the delay of the wireless section to 1 ms or less while achieving a throughput of 10 Gbps or more, various wireless technologies are being studied.
- Non-Patent Document 1 wireless communication using millimeter waves is under consideration, and it is assumed to use a wide range of frequencies up to higher frequency bands than LTE (Long Term Evolution).
- LTE Long Term Evolution
- the propagation loss increases in the high frequency band, application of beamforming with a narrow beam width has been studied in order to compensate for the propagation loss (for example, Non-Patent Document 1).
- the present invention has been made in view of the above, and it is an object of a user apparatus corresponding to transmission by beamforming to perform appropriate transmission power control.
- the beamforming is performed based on the gain of the transmitting unit that communicates with the base station apparatus and performs beamforming using an antenna having directivity and transmits the signal to the base station apparatus, and the antenna And a control unit that controls the maximum transmission power in the transmission that performs the user equipment.
- a user apparatus capable of beamforming transmission can perform appropriate transmission power control.
- the existing technology can be used as appropriate.
- the existing technology is, for example, the existing LTE, but is not limited to the existing LTE.
- LTE used herein has a broad meaning including LTE-Advanced and LTE-Advanced or later (eg, 5G or NR) unless otherwise specified.
- SS Synchronization Signal
- PSS Primary SS
- SSS Secondary SS
- PBCH Physical broadcast channel
- SS Synchronization Signal
- PSS Primary SS
- SSS Secondary SS
- PBCH Physical broadcast channel
- FIG. 1 is a diagram showing an example of a configuration of a wireless communication system according to an embodiment of the present invention.
- the wireless communication system in the embodiment of the present invention includes base station apparatus 100 and user apparatus 200 as shown in FIG. Although one base station apparatus 100 and one user apparatus 200 are shown in FIG. 1, this is an example, and may be plural.
- the base station apparatus 100 is a communication apparatus that provides one or more cells and performs wireless communication with the user apparatus 200. As shown in FIG. 1, the base station apparatus 100 transmits information on transmission power control and information on scheduling to the user apparatus 200.
- the information on transmission power control is, for example, a TPC command (Transmission Power Control command) transmitted by DCI (Downlink Control Information).
- the TPC command notifies the user apparatus 200 of the absolute value or the accumulated value of the transmission power of PUSCH (Physical Uplink Shared Channel).
- the information related to scheduling is information specifying a resource to be used in uplink or downlink by DCI, and the information specifying the resource is notified to the user apparatus 200.
- the user apparatus 200 transmits information on transmission power setting and antenna gain information to the base station apparatus 100.
- the information on the transmission power setting is, for example, PHR (Power Head Room).
- the user apparatus 200 transmits, to the base station apparatus 100, information indicating a value obtained by subtracting the current transmission power from the maximum transmission power by PHR.
- the antenna gain information is information indicating the antenna gain in the direction in which the user apparatus 200 is currently transmitting (details will be described later).
- the user apparatus 200 transmits an uplink transmission signal by beamforming to the base station apparatus 100.
- the duplex method may be a frequency division duplex (FDD) method or a method other than that (flexible duplex etc.).
- FDD frequency division duplex
- transmitting a signal using a transmit beam may be synonymous with transmitting a signal that has been multiplied by a precoding vector (precoded with a precoding vector).
- receiving a signal using a receive beam may be synonymous with multiplying the received signal by a predetermined weight vector.
- transmitting a signal using a transmit beam may be referred to as transmitting a signal at a particular antenna port.
- receiving a signal using a receive beam may be referred to as receiving a signal at a particular antenna port.
- the antenna port refers to a logical antenna port or a physical antenna port defined in the 3GPP standard.
- the method of forming the transmit beam and the receive beam is not limited to the method described above.
- a method of changing the angle of each antenna may be used, or a method combining the method of using precoding vector and the method of changing the antenna angle Alternatively, other methods may be used.
- a plurality of different transmit beams may be used in the high frequency band.
- the use of multiple transmission beams is called multi-beam operation, and the use of one transmission beam is called single-beam operation.
- FIG. 2 is a diagram showing an example of the configuration of a circuit that performs digital beam forming.
- DACs Digital Analog Converters
- baseband signal processing for performing precoding is performed as many as the number of transmission antenna elements Digital beamforming is being considered.
- FIG. 3 is a diagram showing a configuration example of a circuit that performs analog beam forming.
- beamforming is performed using a variable phase shifter in an RF (Radio Frequency) circuit at a subsequent stage where a transmission signal is converted to an analog signal through a DAC.
- RF Radio Frequency
- FIG. 4 is a diagram showing an example of the configuration of a circuit that performs hybrid beam forming. As shown in FIG. 4, by combining digital beamforming and analog beamforming, a hybrid beam that realizes beamforming processing with both baseband signal processing for precoding and a variable phase shifter in an RF circuit. Forming is being considered.
- Example 1 will be described below.
- FIG. 5 is a diagram for explaining an antenna gain at the time of beam forming in the embodiment of the present invention.
- the antenna characteristic at the time of the beamforming of the user apparatus 200 is shown typically.
- the antenna characteristic at the time of beamforming of the user apparatus 200 has directivity.
- the upper diagram in FIG. 5 shows the antenna characteristics in the horizontal plane, showing the main lobe corresponding to the largest radiation and the other sublobes. As shown in FIG. 5, since the antenna has directivity, the gain largely changes depending on the radiation angle. From the dotted line indicating the isotropic antenna gain 0 dBi to the maximum radiation of the main lobe becomes the antenna gain of the directional antenna of the user apparatus 200.
- the lower diagram in FIG. 5 shows the antenna characteristics in the vertical plane, showing the main lobe corresponding to the largest radiation and the other sublobes. Since it is assumed that the user device 200 is on the ground, a hemispherical vertical surface is displayed, but in practice the power is radiated in a spherical manner.
- EIRP Equivalent Isotropic Radiated Power
- the user apparatus 200 can set the antenna gain as shown in FIG. 5 in the direction in which the user is currently transmitting, for example, how many elevations and azimuths are each. It is calculated by storing in advance how much the gain is when the beam is directed in the direction.
- the antenna gain may be calculated by another algorithm. That is, the user apparatus 200 can obtain the antenna gain in the direction in which it is currently transmitting.
- FIG. 6 is a diagram (1) for explaining the case where the transmission power in the embodiment of the present invention is defined by the peak EIRP value.
- the antenna characteristic of the user apparatus 200 in a horizontal surface is shown typically.
- the maximum radiation of the main lobe of the antenna of the user device 200 corresponds to the peak EIRP. That is, peak EIRP can be achieved in the direction in which the antenna of the user apparatus 200 can obtain the maximum antenna gain.
- peak EIRP can be achieved in the direction in which the antenna of the user apparatus 200 can obtain the maximum antenna gain.
- the antenna gain is 10 dB when the peak EIRP is achieved.
- the antenna gain is reduced to, for example, 7 dB.
- the maximum transmission power P CMAX, c of the user apparatus 200 in LTE is given by the following equation.
- P PowerClass is the maximum transmission power according to the class of user equipment. For example, a typical LTE user equipment is class 3 and the maximum transmission power is defined as 23 dBm.
- MPR Maximum Power Reduction
- A-MPR Additional MPR
- ⁇ T is, for example, a correction value such as an allowable error.
- the maximum transmission power P CMAX is given by a formula based on P PowerClass as shown in the above formula.
- P PowerClass is the maximum transmission power at the antenna connector end.
- P PowerClass is defined as 30 dBm which is a peak EIRP including antenna gain, and other parameter values are set to zero in order to simplify the calculation, the maximum transmission power P cmax, C is 30 dBm It becomes.
- P EMAX, c be a sufficiently high value.
- the transmission power of PUSCH in LTE is defined by the following equation.
- P PUSCH, c (i) min ⁇ P CMAX, c (i), 10 log 10 (M PUSCH, c (i)) + P O _ PUSCH , c (j) + ⁇ c (j) PL c + ⁇ T F, c (i) + F c (i) ⁇
- the transmission power of the PUSCH occur if the P CMAX based P PowerClass, the value of c 30 dBm, the maximum transmit power that exceeds the capabilities of the user device 200 is set, appropriate power I can not control.
- the power control may adversely affect the power consumption of the user apparatus 200, network scheduling, and the like.
- the maximum transmission power is corrected according to the antenna gain in the direction in which the user apparatus 200 is transmitting, so that the appropriate maximum transmission power setting is performed.
- a parameter “ ⁇ G c ” corresponding to the correction is newly introduced.
- the above “ ⁇ G c ” is a difference value obtained by subtracting the current antenna gain of the user apparatus 200 from the antenna gain when the user apparatus 200 for the serving cell c achieves the peak EIRP. Therefore, “ ⁇ G c ” always takes a positive value.
- the parameter for calculating the maximum transmission power is corrected according to the antenna gain in the direction in which the current user apparatus 200 is transmitting, and the appropriate maximum transmission power You can set it.
- the user apparatus 200 transmits information on the maximum transmission power setting calculated by the above method based on the antenna gain to the base station apparatus 100 via Uplink Control Information (UCI) or Medium Access Control (MAC) signaling or the like. It may be notified. Also, the base station apparatus 100 may be notified of information indicating the antenna gain in the direction in which the current user apparatus 200 is transmitting, together with or instead of the information on the maximum transmission power setting.
- UCI Uplink Control Information
- MAC Medium Access Control
- the user apparatus 200 may notify the base station apparatus 100 of the information regarding the above-mentioned maximum transmission power setting and / or the information indicating the antenna gain by including it in the PHR.
- the PHR includes information indicating a value obtained by subtracting the present transmission power from the maximum transmission power of the user apparatus 200, and further includes information on the setting of the maximum transmission power according to the first embodiment and / or information indicating the antenna gain. Then, the base station apparatus 100 can perform accurate transmission power control on the user apparatus 200.
- the base station apparatus 100 performs control of the network, that is, transmission power control and scheduling of the user apparatus 200 based on the information on the maximum transmission power setting notified from the user apparatus 200 and / or the information indicating the antenna gain.
- the maximum transmission power may be calculated based on the information related to the antenna gain of the user apparatus 200, and the method of calculating the maximum transmission power is the above equation or the like. It is not limited to the method based on.
- FIG. 7 is a diagram (2) for explaining the case where the transmission power in the embodiment of the present invention is defined by the peak EIRP value.
- the antenna characteristic of the user apparatus 200 in a perpendicular surface is shown typically.
- the maximum radiation of the main lobe of the antenna of the user device 200 corresponds to the peak EIRP. Therefore, peak EIRP can be achieved in the direction in which the antenna of the user apparatus 200 can obtain the maximum antenna gain. At this time, from the dotted line indicated by the isotropic antenna gain 0 dBi to the tip of the main lobe corresponds to the antenna gain.
- the maximum transmission power based on the antenna gain in the direction in which the user apparatus 200 is transmitting (the direction to the base station)
- the maximum transmission power exceeding the capability of the user apparatus 200 is set. In such a case, it is possible to avoid an inappropriate maximum transmission power setting, and to enable appropriate transmission power control and scheduling.
- Example 2 Example 2 will be described below. In the second embodiment, differences from the first embodiment will be described. Therefore, points that are not particularly mentioned may be the same as in the first embodiment.
- FIG. 8 is a diagram (1) for explaining the case where the transmission power in the embodiment of the present invention is defined by the EIRP value based on the CDF.
- the antenna characteristic of the user apparatus 200 in a horizontal surface is shown typically.
- P PowerClass is defined by an EIRP value at which the CDF of the antenna of the user apparatus 200 shown in FIG. 8 is 50%.
- EIRP EIRP value at which the CDF of the antenna of the user apparatus 200 shown in FIG. 8 is 50%.
- the antenna gain is 7 dB.
- the antenna gain increases to, for example, 10 dB.
- the user apparatus 200 further transmits in the direction away from the boresight of the antenna, it drops to 3 dB and so on.
- P PowerClass is defined as 27 dBm, which is an EIRP at which the CDF including antenna gain is 50%, and other parameter values are set at zero in order to simplify the calculation.
- the transmission power P cmax, C is 27 dBm.
- the transmission power of PUSCH in LTE is defined by the following equation.
- P PUSCH, c (i) min ⁇ P CMAX, c (i), 10 log 10 (M PUSCH, c (i)) + P O _ PUSCH , c (j) + ⁇ c (j) PL c + ⁇ T F, c (i) + F c (i) ⁇
- the transmission power of the PUSCH occur if the P CMAX based P PowerClass, the value of c 27 dBm, the maximum transmit power that is less than the capabilities of the user device 200 is set, appropriate power I can not control.
- the power control may adversely affect the power consumption of the user apparatus 200, network scheduling, and the like.
- the antenna gain changes to 3 dB or the like.
- the capacity of the maximum transmission power that can be transmitted by the user apparatus 200 is 23 dBm.
- the transmission power of PUSCH in LTE is defined by the following equation.
- P PUSCH, c (i) min ⁇ P CMAX, c (i), 10 log 10 (M PUSCH, c (i)) + P O _ PUSCH , c (j) + ⁇ c (j) PL c + ⁇ T F, c (i) + F c (i) ⁇
- the transmission power of the PUSCH occur if the P CMAX based P PowerClass, the value of c 27 dBm, the maximum transmit power that is higher than the capability of the user equipment 200 is set, the appropriate power control I can not The power control may adversely affect the power consumption of the user apparatus 200, network scheduling, and the like.
- the maximum transmission power is corrected according to the antenna gain in the direction in which the user apparatus 200 is transmitting, so that the appropriate maximum transmission power setting is performed.
- a parameter “ ⁇ G c ” corresponding to the correction is newly introduced.
- the above “ ⁇ G c ” is a difference value obtained by subtracting the current antenna gain of the user apparatus 200 from the antenna gain when the user apparatus 200 for the serving cell c achieves the EIRP at which the CDF is 50%. Become. Therefore, “ ⁇ G c ” takes a negative value when transmitting toward the boresight of the antenna more, and a positive value when transmitting toward the antenna away from the boresight of the antenna.
- P CMAX, c By correcting P CMAX, c by “ ⁇ G c ”, the parameter for calculating the maximum transmission power is corrected according to the antenna gain in the direction in which the current user apparatus 200 is transmitting, and the appropriate maximum transmission power You can set it.
- the user apparatus 200 notifies the base station apparatus 100 of the information on the maximum transmission power setting calculated by the above method based on the antenna gain via UCI or MAC signaling or the like. It is also good. Also, the base station apparatus 100 may be notified of information indicating the antenna gain in the direction in which the current user apparatus 200 is transmitting, together with or instead of the information on the maximum transmission power setting.
- the user apparatus 200 may notify the base station apparatus 100 of the information regarding the above-mentioned maximum transmission power setting and / or the information indicating the antenna gain by including it in the PHR.
- the PHR includes information indicating a value obtained by subtracting the present transmission power from the maximum transmission power of the user apparatus 200, and further includes information on the setting of the maximum transmission power according to the second embodiment and / or information indicating the antenna gain. Then, the base station apparatus 100 can perform accurate transmission power control on the user apparatus 200.
- the base station apparatus 100 controls the network based on the information on the maximum transmission power setting notified from the user apparatus 200 and / or the information indicating the antenna gain, that is, the transmission power control of the user apparatus. And scheduling etc.
- EIRP value at which the CDF is 50% has been described in the above-mentioned second embodiment, for example, an EIRP value at which the CDF is 80% or the CDF is 30% may be used.
- the percentage of CDF as a reference can be freely set, and an EIRP value defined based on the percentage of the CDF may be used for maximum transmission power control. That is, maximum transmission power control may be performed based on any intermediate value from the minimum value to the maximum value of the antenna gain achieved by the user apparatus 200.
- FIG. 9 is a diagram (2) for explaining the case where the transmission power in the embodiment of the present invention is defined by the EIRP value based on the CDF.
- the antenna characteristic of the user apparatus 200 in a perpendicular surface is shown typically.
- the maximum transmission power which does not meet the capability of the user apparatus 200 is set. Inappropriate maximum transmit power settings can be avoided. In addition, it is possible to avoid an inappropriate maximum transmission power setting in which the maximum transmission power exceeding the capability of the user apparatus 200 is set. Therefore, appropriate transmission power control and scheduling are possible.
- Example 3 The third embodiment will be described below. In the third embodiment, points different from the first embodiment or the second embodiment will be described. Therefore, points that are not particularly mentioned may be the same as in Example 1 or Example 2.
- P CMAX, c of the user apparatus 200 in LTE is given by the following equation.
- P PowerClass in the above equation may represent the EIRP value in the direction in which the user device 200 is transmitting, without introducing ⁇ Gc. That is, P PowerClass may be defined as a variable indicating an EIRP value in the direction in which the user apparatus 200 is transmitting
- P Powerclass is defined including the EIRP value corresponding to the antenna gain in the direction in which the user apparatus 200 is transmitting (the direction with respect to the base station), thereby setting the maximum transmission power. It becomes possible.
- the base station apparatus 100 and the user apparatus 200 each include the function of implementing at least the first, second, and third embodiments. However, the base station apparatus 100 and the user apparatus 200 may be provided with only some of the functions in the first, second, and third embodiments, respectively.
- FIG. 10 is a diagram showing an example of a functional configuration of the base station apparatus 100.
- the base station apparatus 100 includes a transmission unit 110, a reception unit 120, a setting information management unit 130, and a network control unit 140.
- the functional configuration shown in FIG. 10 is merely an example. As long as the operation according to the embodiment of the present invention can be performed, the names of the function divisions and the function parts may be arbitrary.
- the transmission unit 110 includes a function of generating a signal to be transmitted to the user apparatus 200 and transmitting the signal wirelessly.
- the receiving unit 120 includes a function of receiving various signals transmitted from the user apparatus 200 and acquiring, for example, higher layer information from the received signals.
- the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signal and the like to the user apparatus 200.
- the transmitting unit 110 transmits information on transmission power control and information on scheduling to the user apparatus 200, and the receiving unit 120 receives information on transmission power setting and information indicating antenna gain from the user apparatus 200.
- the setting information management unit 130 stores setting information set in advance and various setting information to be transmitted to the user device 200.
- the contents of the setting information are, for example, information on transmission power control and information on scheduling.
- the network control unit 140 performs control related to transmission power control and scheduling for the user apparatus 200 in the base station apparatus 100 described in the first, second, and third embodiments.
- the control, information on transmission power setting received from the user apparatus 200, and information indicating antenna gain may be used.
- FIG. 11 is a diagram showing an example of a functional configuration of the user apparatus 200.
- the user apparatus 200 includes a transmission unit 210, a reception unit 220, a setting information management unit 230, and a transmission power control unit 240.
- the functional configuration shown in FIG. 11 is merely an example. As long as the operation according to the embodiment of the present invention can be performed, the names of the function divisions and the function parts may be arbitrary.
- the transmission unit 210 creates a transmission signal from transmission data, and wirelessly transmits the transmission signal.
- the receiving unit 220 wirelessly receives various signals, and acquires higher layer signals from the received physical layer signals.
- the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL control signal and the like transmitted from the base station apparatus 100.
- the transmitting unit 210 transmits information on transmission power setting and information indicating antenna gain to the base station apparatus 100, and the receiving unit 120 receives information on transmission power control and information on scheduling from the base station apparatus 100.
- the setting information management unit 230 stores various setting information received from the base station apparatus 100 by the receiving unit 220.
- the setting information management unit 230 also stores setting information set in advance.
- the content of the setting information is, for example, information on transmission power setting and information indicating an antenna gain.
- the transmission power control unit 240 performs control related to transmission power setting in the user apparatus 200 described in the first, second, and third embodiments.
- a functional unit related to signal transmission in the transmission power control unit 240 may be included in the transmission unit 210, and a functional unit related to signal reception in the transmission power control unit 240 may be included in the reception unit 220.
- each functional block may be realized by one device physically and / or logically connected to a plurality of elements, or directly and two or more physically and / or logically separated devices. And / or indirectly (for example, wired and / or wirelessly) connected, and may be realized by the plurality of devices.
- both the base station apparatus 100 and the user apparatus 200 in the embodiment of the present invention may function as a computer that performs the process according to the embodiment of the present invention.
- FIG. 12 is a diagram showing an example of a hardware configuration of a wireless communication apparatus which is the base station apparatus 100 or the user apparatus 200 according to the embodiment of the present invention.
- the above-described base station apparatus 100 and user apparatus 200 physically are each a computer apparatus including a processor 1001, a storage apparatus 1002, an auxiliary storage apparatus 1003, a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006, a bus 1007 and the like. It may be configured.
- the term "device” can be read as a circuit, a device, a unit, or the like.
- the hardware configuration of the base station apparatus 100 and the user apparatus 200 may be configured to include one or more of the devices indicated by 1001 to 1006 shown in the figure, or may be configured without including some devices. It may be done.
- Each function in base station apparatus 100 and user apparatus 200 causes processor 1001 to perform an operation by reading predetermined software (program) on hardware such as processor 1001, storage apparatus 1002, etc. This is realized by controlling reading and / or writing of data in the storage device 1002 and the auxiliary storage device 1003.
- the processor 1001 operates, for example, an operating system to control the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.
- CPU Central Processing Unit
- the processor 1001 reads a program (program code), a software module or data from the auxiliary storage device 1003 and / or the communication device 1004 to the storage device 1002, and executes various processing according to these.
- a program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
- the transmission unit 110, the reception unit 120, the setting information management unit 130, and the network control unit 140 of the base station apparatus 100 shown in FIG. 10 are stored in the storage device 1002 and realized by a control program operated by the processor 1001. It is also good.
- control unit 210 stores the transmission unit 210, the reception unit 220, the setting information management unit 230, and the transmission power control unit 240 of the user apparatus 200 illustrated in FIG. It may be realized by The various processes described above have been described to be executed by one processor 1001, but may be executed simultaneously or sequentially by two or more processors 1001.
- the processor 1001 may be implemented by one or more chips.
- the program may be transmitted from the network via a telecommunication line.
- the storage device 1002 is a computer readable recording medium, and is, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). It may be configured.
- the storage device 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the storage device 1002 can store a program (program code), a software module, and the like that can be executed to perform the process according to an embodiment of the present invention.
- the auxiliary storage device 1003 is a computer-readable recording medium, and for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray disc) -Ray (R) disk), smart card, flash memory (for example, card, stick, key drive), floppy (R) disk, magnetic strip and the like.
- the auxiliary storage device 1003 may be called an auxiliary storage device.
- the above-described storage medium may be, for example, a database including the storage device 1002 and / or the auxiliary storage device 1003, a server or other appropriate media.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, or the like.
- the transmission unit 110 and the reception unit 120 of the base station apparatus 100 may be realized by the communication apparatus 1004.
- the transmission unit 210 and the reception unit 220 of the user apparatus 200 may be realized by the communication apparatus 1004.
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside.
- 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 be integrated (for example, a touch panel).
- each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured by a single bus or may be configured by different buses among the devices.
- the base station apparatus 100 and the user apparatus 200 respectively include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), and the like.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- Hardware, and part or all of each functional block may be realized by the hardware.
- processor 1001 may be implemented in at least one of these hardware.
- a user apparatus that communicates with a base station apparatus performs beamforming using an antenna having directivity and performs transmission to the base station apparatus.
- a user apparatus comprising: a transmission unit; and a control unit that controls the maximum transmission power in transmission for performing the beamforming based on the gain of the antenna.
- the above configuration enables the user apparatus to perform appropriate transmission power control based on the antenna gain.
- the gain may be a maximum gain of the antenna.
- the gain may be an intermediate value from the maximum gain to the minimum gain of the gain of the antenna.
- Information on the maximum transmission power controlled by the control unit or information indicating the gain of the antenna may be transmitted to the base station apparatus.
- the base station apparatus can perform appropriate transmission power control and scheduling based on the information received from the user apparatus.
- the information for reporting the power headroom to the base station apparatus may include information on the maximum transmission power controlled by the control unit or information indicating the gain of the antenna.
- the base station apparatus can perform appropriate transmission power control and scheduling based on the PHR received from the user apparatus.
- a base station apparatus that communicates with a user apparatus, and receives, from the user apparatus, information on maximum transmission power involved in transmission by beamforming of the user apparatus or information indicating an antenna gain for beamforming of the user apparatus
- a base station apparatus comprising: a receiving unit; and a network control unit that performs transmission power control and scheduling for the user apparatus based on information on the maximum transmission power or information indicating the gain of the antenna.
- the above configuration enables the base station apparatus to perform appropriate transmission power control and scheduling for the user apparatus based on the information on the maximum transmission power reported from the user apparatus or the information indicating the antenna gain. .
- the operations of multiple functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by multiple components.
- the order of processing may be changed as long as there is no contradiction.
- the base station apparatus 100 and the user apparatus 200 are described using a functional block diagram for the convenience of the processing description, such an apparatus may be realized in hardware, software or a combination thereof.
- the software operated by the processor of the base station apparatus 100 according to the embodiment of the present invention and the software operated by the processor of the user apparatus 200 according to the embodiment of the present invention are random access memory (RAM), flash memory, read It may be stored in a dedicated memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.
- RAM random access memory
- ROM dedicated memory
- EPROM EPROM
- EEPROM electrically erasable programmable read-only memory
- register hard disk
- removable disk CD-ROM
- database database
- server server or any other suitable storage medium.
- notification of information is not limited to the aspect / embodiment described herein, and may be performed by other methods.
- notification of information may be physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block), other signals, or a combination thereof.
- RRC signaling may be called an RRC message, for example, RRC It may be a connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.
- Each aspect / embodiment described in the present specification is LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), 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-Wide Band),
- the present invention may be applied to a system utilizing Bluetooth (registered trademark), other appropriate systems, and / or an advanced next-generation system based on these.
- the specific operation performed by the base station apparatus 100 in this specification may also be performed by its upper node.
- various operations performed for communication with the user apparatus 200 may be performed by the base station apparatus 100 and / or the base station apparatus 100. It will be appreciated that it may be performed by other network nodes other than (for example but not limited to MME or S-GW etc).
- MME Mobility Management Entity
- S-GW Serving GPRS Support Node
- the user equipment 200 may be a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, by those skilled in the art. It may also be called a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.
- Base station apparatus 100 may also be referred to by those skilled in the art with NB (Node B), eNB (enhanced Node B), gNB, Base Station, or some other suitable term.
- NB Node B
- eNB enhanced Node B
- gNB Base Station
- determining may encompass a wide variety of operations.
- “Judgment”, “decision” are, for example, judging, calculating, calculating, processing, processing, deriving, investigating, looking up (for example, a table) (Searching in a database or another data structure), ascertaining may be regarded as “decision”, “decision” and the like.
- “determination” and “determination” are receiving (e.g. receiving information), transmitting (e.g. transmitting information), input (input), output (output), access (Accessing) (for example, accessing data in a memory) may be regarded as “judged” or “decided”.
- judgement and “decision” are to be regarded as “judgement” and “decision” that they have resolved (resolving), selecting (selecting), choosing (choosing), establishing (establishing) May be included. That is, “judgment” "decision” may include considering that some action is “judged” "decision”.
- the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- the transmission power control unit 240 is an example of a control unit.
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Abstract
Description
図1は、本発明の実施の形態における無線通信システムの構成例を示す図である。本発明の実施の形態における無線通信システムは、図1に示すように、基地局装置100及びユーザ装置200を含む。図1には、基地局装置100及びユーザ装置200が1つずつ示されているが、これは例であり、それぞれ複数であってもよい。
図2は、デジタルビームフォーミングを行う回路の構成例を示す図である。ビームフォーミングを実現する方法として、図2に示されるように、送信アンテナ素子数と同じ数のDAC(Digital Analog Converter)を備えると共に、プリコーディングを行うベースバンド信号処理を送信アンテナ素子の数だけ行うデジタルビームフォーミングが検討されている。
以下、実施例1について説明する。
PCMAX_L,c≦PCMAX,c≦PCMAX_H,c with
PCMAX_L,c=MIN{PEMAX,c-ΔTC,c,(PPowerClass-ΔPPowerClass)-MAX(MPRc+A-MPRc+ΔTIB,c+ΔTC,c+ΔTProSe,P-MPRc)}
PCMAX_H,c=MIN{PEMAX,c,PPowerClass-ΔPPowerClass}
PEMAX,cは、セルCにおけるユーザ装置の最大送信電力である。
PPowerClassは、ユーザ装置のクラスに応じた最大送信電力である。例えば、通常のLTEユーザ装置は、クラス3であり、最大送信電力は23dBmと定義されている。
MPR(Maximum Power Reduction)は、最大電力低減である。
A-MPR(Additional MPR)は、追加最大電力低減である。
ΔTは、例えば、許容誤差等の補正値である。
PPUSCH,c(i)=min{PCMAX,c(i),10log10(MPUSCH,c(i))+PO_PUSCH,c(j)+αc(j)PLc+ΔTF,c(i)+fc(i)}
上記の数式に従えば、PUSCHの送信電力は、PPowerClassに基づくPCMAX,cの値である30dBmとなる場合が生じ、ユーザ装置200の能力を超えた最大送信電力が設定され、適切な電力制御ができない。当該電力制御によって、ユーザ装置200の消費電力及びネットワークスケジューリング等に、悪影響が及ぼされる可能性がある。
PCMAX_H,c=MIN{PEMAX,c,PPowerClass-ΔGc-ΔPPowerClass}
PPowerClassは、ピークEIRP値で規定されるものとする。したがって、上記の「ΔGc」は、サービングセルcに対するユーザ装置200がピークEIRPを達成しているときのアンテナゲインから、ユーザ装置200の現在のアンテナゲインを減じた差分値となる。そのため、「ΔGc」は常に正の値をとる。「ΔGc」によって、PCMAX,cを補正することにより、現在のユーザ装置200が送信している方向のアンテナゲインに応じて、最大送信電力を算出するパラメータを補正し、適切な最大送信電力設定を行うことができる。
以下、実施例2について説明する。実施例2では実施例1と異なる点について説明する。したがって、特に言及されない点については、実施例1と同様であってよい。
PPUSCH,c(i)=min{PCMAX,c(i),10log10(MPUSCH,c(i))+PO_PUSCH,c(j)+αc(j)PLc+ΔTF,c(i)+fc(i)}
上記の数式に従えば、PUSCHの送信電力は、PPowerClassに基づくPCMAX,cの値である27dBmとなる場合が生じ、ユーザ装置200の能力に満たない最大送信電力が設定され、適切な電力制御ができない。当該電力制御によって、ユーザ装置200の消費電力及びネットワークスケジューリング等に、悪影響が及ぼされる可能性がある。
PPUSCH,c(i)=min{PCMAX,c(i),10log10(MPUSCH,c(i))+PO_PUSCH,c(j)+αc(j)PLc+ΔTF,c(i)+fc(i)}
上記の数式に従えば、PUSCHの送信電力は、PPowerClassに基づくPCMAX,cの値である27dBmとなる場合が生じ、ユーザ装置200の能力を超える最大送信電力が設定され、適切な電力制御ができない。当該電力制御によって、ユーザ装置200の消費電力及びネットワークスケジューリング等に、悪影響が及ぼされる可能性がある。
PCMAX_H,c=MIN{PEMAX,c,PPowerClass-ΔGc-ΔPPowerClass}
PPowerClassは、CDFが50%となるEIRP値で規定されるものとする。したがって、上記の「ΔGc」は、サービングセルcに対するユーザ装置200が、CDFが50%となるEIRPを達成しているときのアンテナゲインから、ユーザ装置200の現在のアンテナゲインを減じた差分値となる。そのため、「ΔGc」は、よりアンテナのボアサイトに向けた送信である場合は負の値、よりアンテナのボアサイトから逸れた方向への送信である場合は正の値をとる。「ΔGc」によって、PCMAX,cを補正することにより、現在のユーザ装置200が送信している方向のアンテナゲインに応じて、最大送信電力を算出するパラメータを補正し、適切な最大送信電力設定を行うことができる。
以下、実施例3について説明する。実施例3では実施例1又は実施例2と異なる点について説明する。したがって、特に言及されない点については、実施例1又は実施例2と同様であってよい。
PCMAX_L,c≦PCMAX,c≦PCMAX_H,c with
PCMAX_L,c=MIN{PEMAX,c-ΔTC,c,(PPowerClass-ΔPPowerClass)-MAX(MPRc+A-MPRc+ΔTIB,c+ΔTC,c+ΔTProSe,P-MPRc)}
PCMAX_H,c=MIN{PEMAX,c,PPowerClass-ΔPPowerClass}
実施例3においては、ΔGcを導入せずに、上記の式中のPPowerClassが、ユーザ装置200が送信している方向のEIRP値を表してもよい。すなわち、PPowerClassは、ユーザ装置200が送信している方向のEIRP値を示す変数と定義されてもよい。
次に、これまでに説明した処理及び動作を実行する基地局装置100及びユーザ装置200の機能構成例を説明する。基地局装置100及びユーザ装置200はそれぞれ、少なくとも実施例1、2及び3を実施する機能を含む。ただし、基地局装置100及びユーザ装置200はそれぞれ、実施例1、2及び3の中の一部の機能のみを備えることとしてもよい。
図10は、基地局装置100の機能構成の一例を示す図である。図10に示されるように、基地局装置100は、送信部110と、受信部120と、設定情報管理部130と、ネットワーク制御部140とを有する。図10に示される機能構成は一例に過ぎない。本発明の実施の形態に係る動作を実行できるのであれば、機能区分及び機能部の名称はどのようなものでもよい。
図11は、ユーザ装置200の機能構成の一例を示す図である。図11に示されるように、ユーザ装置200は、送信部210と、受信部220と、設定情報管理部230と、送信電力制御部240とを有する。図11に示される機能構成は一例に過ぎない。本発明の実施の形態に係る動作を実行できるのであれば、機能区分及び機能部の名称はどのようなものでもよい。
上述の本発明の実施の形態の説明に用いた機能構成図(図10及び図11)は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及び/又はソフトウェアの任意の組み合わせによって実現される。また、各機能ブロックの実現手段は特に限定されない。すなわち、各機能ブロックは、物理的及び/又は論理的に複数要素が結合した1つの装置により実現されてもよいし、物理的及び/又は論理的に分離した2つ以上の装置を直接的及び/又は間接的に(例えば、有線及び/又は無線)で接続し、これら複数の装置により実現されてもよい。
以上、説明したように、本発明の実施の形態によれば、基地局装置と通信を行うユーザ装置であって、指向性を有するアンテナを用いてビームフォーミングを行い前記基地局装置に送信を行う送信部と、前記アンテナの利得に基づいて、前記ビームフォーミングを行う送信における最大送信電力を制御する制御部とを有するユーザ装置が提供される。
以上、本発明の実施の形態を説明してきたが、開示される発明はそのような実施形態に限定されず、当業者は様々な変形例、修正例、代替例、置換例等を理解するであろう。発明の理解を促すため具体的な数値例を用いて説明がなされたが、特に断りのない限り、それらの数値は単なる一例に過ぎず適切な如何なる値が使用されてもよい。上記の説明における項目の区分けは本発明に本質的ではなく、2以上の項目に記載された事項が必要に応じて組み合わせて使用されてよいし、ある項目に記載された事項が、別の項目に記載された事項に(矛盾しない限り)適用されてよい。機能ブロック図における機能部又は処理部の境界は必ずしも物理的な部品の境界に対応するとは限らない。複数の機能部の動作が物理的には1つの部品で行われてもよいし、あるいは1つの機能部の動作が物理的には複数の部品により行われてもよい。実施の形態で述べた処理手順については、矛盾の無い限り処理の順序を入れ替えてもよい。処理説明の便宜上、基地局装置100及びユーザ装置200は機能的なブロック図を用いて説明されたが、そのような装置はハードウェアで、ソフトウェアで又はそれらの組み合わせで実現されてもよい。本発明の実施の形態に従って基地局装置100が有するプロセッサにより動作するソフトウェア及び本発明の実施の形態に従ってユーザ装置200が有するプロセッサにより動作するソフトウェアはそれぞれ、ランダムアクセスメモリ(RAM)、フラッシュメモリ、読み取り専用メモリ(ROM)、EPROM、EEPROM、レジスタ、ハードディスク(HDD)、リムーバブルディスク、CD-ROM、データベース、サーバその他の適切な如何なる記憶媒体に保存されてもよい。
200 ユーザ装置
110 送信部
120 受信部
130 設定情報管理部
140 ネットワーク制御部
200 ユーザ装置
210 送信部
220 受信部
230 設定情報管理部
240 送信電力制御部
1001 プロセッサ
1002 記憶装置
1003 補助記憶装置
1004 通信装置
1005 入力装置
1006 出力装置
Claims (6)
- 基地局装置と通信を行うユーザ装置であって、
指向性を有するアンテナを用いてビームフォーミングを行い前記基地局装置に送信を行う送信部と、
前記アンテナの利得に基づいて、前記ビームフォーミングを行う送信における最大送信電力を制御する制御部とを有するユーザ装置。 - 前記利得は、前記アンテナの最大利得である請求項1記載のユーザ装置。
- 前記利得は、前記アンテナの利得の最大利得から最小利得までの中間値である請求項1記載のユーザ装置。
- 前記制御部に制御される最大送信電力に関する情報又は前記アンテナの利得を示す情報を、前記基地局装置に送信する請求項1記載のユーザ装置。
- 前記基地局装置にパワーヘッドルームを報告する情報に、前記制御部に制御される最大送信電力に関する情報又は前記アンテナの利得を示す情報を含める請求項1記載のユーザ装置。
- ユーザ装置と通信を行う基地局装置であって、
前記ユーザ装置から、前記ユーザ装置のビームフォーミングによる送信に係る最大送信電力に関する情報又は前記ユーザ装置のビームフォーミングに係るアンテナの利得を示す情報を受信する受信部と、
前記最大送信電力に関する情報又は前記アンテナの利得を示す情報に基づいて、前記ユーザ装置に対する送信電力制御及びスケジューリングを行うネットワーク制御部とを有する基地局装置。
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Also Published As
Publication number | Publication date |
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EP3664497A4 (en) | 2021-04-21 |
PT3664497T (pt) | 2024-03-14 |
ZA201907453B (en) | 2021-05-26 |
EP3664497A1 (en) | 2020-06-10 |
SG11201909838WA (en) | 2019-11-28 |
BR112020001423A2 (pt) | 2020-07-28 |
JPWO2019026831A1 (ja) | 2020-06-25 |
JP7128820B2 (ja) | 2022-08-31 |
CN110945894B (zh) | 2023-06-16 |
EP3664497B1 (en) | 2024-02-21 |
CN110945894A (zh) | 2020-03-31 |
US20200252887A1 (en) | 2020-08-06 |
US11582702B2 (en) | 2023-02-14 |
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