WO2012090327A1 - 無線通信システム、移動局、基地局および無線通信方法 - Google Patents
無線通信システム、移動局、基地局および無線通信方法 Download PDFInfo
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- WO2012090327A1 WO2012090327A1 PCT/JP2010/073806 JP2010073806W WO2012090327A1 WO 2012090327 A1 WO2012090327 A1 WO 2012090327A1 JP 2010073806 W JP2010073806 W JP 2010073806W WO 2012090327 A1 WO2012090327 A1 WO 2012090327A1
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- transmission power
- power
- power control
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- mobile station
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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
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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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
Definitions
- the present invention relates to a wireless communication system, a mobile station, a base station, and a wireless communication method that can communicate using a plurality of frequency carriers simultaneously.
- LTE-A Long Term Evolution-Advanced introduces carrier aggregation (Carrier Aggregation (CA)) as a technology capable of transmitting larger volumes of data.
- CA Carrier Aggregation
- UE mobile station
- eNB base station
- CC component carriers
- the mobile station when data is transmitted and received by CA, the mobile station is assigned frequency resources with good radio quality for each CC by frequency scheduling. Therefore, in CA, the allocated frequency resource amount may differ for each CC.
- CA can perform independent transmission power control (TPC: Transmission Power Control) for each CC. Therefore, the transmission power value and power spectral density (PSD: Power Spectral Density) of each CC may differ between CCs.
- TPC Transmission Power Control
- PSD Power Spectral Density
- a mobile station calculates a transmission power value for each CC based on a TPC command sent from a base station. Then, the mobile station converts the difference in transmission power value between CCs into an amplitude ratio, and adjusts the amplitude of each CC based on the amplitude ratio. Therefore, for example, when the difference between the transmission power values of the CCs is large, if the amplitude adjustment is performed with reference to the CC having the largest transmission power value in the mobile station, the amplitude level of the CC signal having a small transmission power value becomes small. As a result, the quantization error increases. As a result, there has been a problem that the signal quality of a CC having a small transmission power value is deteriorated.
- the amplitude adjustment is performed with reference to the CC having the smallest transmission power value in the mobile station in order to avoid deterioration of the signal quality of the CC having a small transmission power value
- the amplitude of the CC signal having a large transmission power value is used.
- the level increases and overflow occurs in the DA converter. That is, there is a problem that this overflow may cause deterioration of signal quality and unnecessary signal out-of-band interference.
- the disclosed technology has been made in view of the above, and provides a wireless communication system, a mobile station, a base station, and a wireless communication method capable of suppressing degradation of signal quality without increasing the circuit scale. Objective.
- the wireless communication system disclosed in the present application is a wireless communication system capable of performing wireless communication using a plurality of frequency bands at the same time, and the mobile station uses the power difference between the allowable power differences between the frequency bands and the transmission power control of the local station.
- An uplink transmission unit that transmits mode information indicating a restriction target to a base station, and a transmission power control unit that controls transmission power based on a transmission power control command received from the base station.
- the station includes a generation unit that generates a transmission power control command based on an allowable power difference between the frequency bands and the mode information, and a downlink transmission unit that transmits the transmission power control command to the mobile station.
- FIG. 1 is a diagram illustrating an example of carrier aggregation.
- FIG. 2 is a diagram illustrating an example of carrier aggregation using discontinuous component carriers.
- FIG. 3 is a diagram illustrating a configuration example of a mobile station.
- FIG. 4 is a diagram illustrating a configuration example of a base station.
- FIG. 5 is a diagram illustrating a configuration example of the transmission power control unit.
- FIG. 6 is a diagram illustrating an example of the configuration of the baseband unit and the RF unit.
- FIG. 7 is a diagram illustrating an example of the configuration of the baseband unit and the RF unit.
- FIG. 8 is a diagram illustrating an example of frequency scheduling in carrier aggregation.
- FIG. 9 is a diagram illustrating an example when transmission power control is performed for each component carrier.
- FIG. 10A is a diagram illustrating an example of a signal when amplitude adjustment is performed on the basis of a component carrier having the maximum transmission power value.
- FIG. 10B is a diagram illustrating an example of a signal when amplitude adjustment is performed on the basis of a component carrier having the maximum transmission power value.
- FIG. 11A is a diagram illustrating an example of a signal when amplitude adjustment is performed with reference to a component carrier having a minimum transmission power value.
- FIG. 11B is a diagram illustrating an example of a signal when amplitude adjustment is performed on the basis of a component carrier having a minimum transmission power value.
- FIG. 12A is a diagram illustrating an example of a signal when the number of quantization bits is large.
- FIG. 12B is a diagram illustrating an example of a signal when the number of quantization bits is large.
- FIG. 13 is a flowchart illustrating an example of a wireless communication method in the wireless communication system according to the first embodiment.
- FIG. 14 is a diagram illustrating a configuration example of a mobile station.
- FIG. 15 is a diagram illustrating a configuration example of a base station.
- FIG. 16 is a diagram illustrating a configuration example of a transmission power control unit.
- FIG. 17 is a flowchart illustrating an example of a wireless communication method in the wireless communication system according to the second embodiment.
- FIG. 18 is a diagram illustrating a configuration example of a mobile station.
- FIG. 19 is a diagram illustrating a configuration example of a base station.
- FIG. 20 is a diagram illustrating a configuration example of the transmission power control unit.
- FIG. 21 is a flowchart illustrating an example of a wireless communication method in the wireless communication system according to the third embodiment.
- LTE-A 3rd Generation Partnership Project
- CA Carrier Aggregation
- FIG. 1 is a diagram showing an example of CA.
- each bundled LTE radio carrier is referred to as a component carrier (Component Carrier (CC)).
- CC component carrier
- UE mobile station
- eNB base station
- LTE-A for example, a mobile station (UE) and a base station (eNB) transmit and receive data using a plurality of CCs.
- a case where communication is performed using three CCs with a bandwidth of 20 MHz (CC # 0, CC # 1, CC # 2) is shown.
- 1 shows a case where communication is performed using CCs in a continuous frequency band.
- CA for example, communication is performed using CCs in a non-continuous frequency band as shown in FIG. It is also possible to do this.
- FIG. 2 is a diagram illustrating an example of CA by discontinuous CC.
- FIG. 3 is a diagram illustrating a configuration example of a mobile station in a wireless communication system
- FIG. 4 is a diagram illustrating a configuration example of a base station in the wireless communication system. Note that the configuration example of the mobile station and the base station lists the configuration related to the processing of the present embodiment for convenience of description, and does not represent all the functions of the mobile station and the base station.
- the mobile station includes a downlink reception unit 1, an uplink transmission unit 2, and a transmission power control unit 3.
- the reception unit 11 notifies the TPC command received from the base station via the antenna 4 to the transmission power control unit 3, and similarly receives the received scheduling information to the uplink transmission unit 2.
- the uplink transmission unit 2 includes a baseband unit 21 and an RF (Radio Frequency) unit 22, and encodes user data assigned to a predetermined CC based on scheduling information, a maximum power difference P MPD between CCs, and limited mode information. And transmit to the base station via the antenna 5.
- RF Radio Frequency
- FIG. 5 is a diagram illustrating a configuration example of the transmission power control unit 3.
- the transmission power control unit 3 includes a CC transmission power calculation unit 31 and an amplitude adjustment coefficient calculation unit 32.
- the CC transmission power calculation unit 31 calculates the transmission power value of each CC based on the TPC command.
- the amplitude adjustment coefficient calculation unit 32 calculates an amplitude adjustment coefficient (amplitude ratio) from the ratio of the transmission power value of each CC or the ratio of the PSD of the transmission power value of each CC, and notifies the baseband unit 21 of the calculation result. .
- the amplitude adjustment coefficient calculation unit 32 calculates the total power, which is the sum of the transmission power values for all CCs, and notifies the RF unit 22 of the calculation result. That is, the transmission power control unit 3 controls the transmission power of each CC based on the amplitude adjustment coefficient obtained by calculation and the total power for all CCs.
- the downlink receiving unit 1, the uplink transmitting unit 2, and the transmission power control unit 3 may be composed of, for example, a CPU (Central Processing Unit), an FPGA (Field Programmable Gate Array), a memory, and the like. Is possible.
- a CPU Central Processing Unit
- FPGA Field Programmable Gate Array
- the base station includes an uplink receiving unit 6 and a downlink transmitting unit 7.
- the receiving unit 61 receives the maximum power difference P MPD between CCs and the limited mode information transmitted from the mobile station via the antenna 8, and the maximum power difference P between CCs after decoding.
- the downlink transmission unit 7 is notified of MPD and restriction mode information.
- the scheduler unit 71 performs scheduling based on the communication quality measurement result by SRS (Sounding Reference Signal).
- the TPC command generation unit 72 generates a TPC command based on the maximum power difference P MPD between CCs after decoding and the limited mode information.
- the transmission unit 73 performs OFDM (Orthogonal Frequency Division Multiplexing) modulation on the TPC command and scheduling information, and transmits the OFDM signal via the antenna 9.
- OFDM Orthogonal Frequency Division Multiplexing
- the uplink receiving unit 6 and the downlink transmitting unit 7 can be configured with, for example, a CPU, an FPGA, a memory, and the like.
- FIG. 6 is a diagram illustrating an example of the configuration of the baseband unit 21 and the RF unit 22.
- the modulation units 101-1, 101-2, and 101-3 individually modulate corresponding CC data (user data, maximum power difference P MPD between CCs, limited mode information, etc.), respectively.
- DFT Discrete Fourier Transform
- IFFT Inverse Fast Fourier Transform
- Upsampling units 104-1, 104-2, and 104-3 increase the sampling rate of each CC signal.
- Frequency shift sections 105-1, 105-2, and 105-3 shift each CC signal after upsampling to a desired frequency band.
- the amplitude adjusting units 106-1, 106-2, and 106-3 each adjust the amplitude of the corresponding CC based on the amplitude adjustment coefficient (amplitude ratio) notified from the transmission power control unit 3.
- the synthesis unit 107 synthesizes the CC signals after amplitude adjustment, and outputs the synthesized signal to the RF unit 22.
- a DAC Digital to Analog Converter
- the orthogonal transformer 112 up-converts the received signal to a radio frequency band.
- a PA Power Amplifier
- FIG. 7 is a diagram showing a configuration example of the baseband unit 21 and the RF unit 22 different from those in FIG.
- symbol is attached
- the amplitude adjustment units 121-1, 121-2, and 121-3 are respectively associated with the corresponding CCs based on the amplitude adjustment coefficient (amplitude ratio) notified from the transmission power control unit 3.
- the amplitude of the frequency domain signal is adjusted.
- an IFFT unit 122 having a sufficiently large FFT (Fast Fourier Transform) size covering all CCs synthesizes the signal of each CC after amplitude adjustment in the frequency domain, and outputs the synthesized signal to the RF unit 22.
- FFT Fast Fourier Transform
- the signals of the CCs are synthesized using any one of the baseband units 21 described above. 6 and 7 describe the case where the baseband unit 21 synthesizes three CC signals, the present invention is not limited to this. For example, two CC signals or four or more CC signals may be combined.
- FIG. 8 is a diagram illustrating an example of frequency scheduling in CA. Since each CC is a DFT-S (Spread) -OFDM signal in the uplink of CA (CC # 0, CC # 1, CC # 2 with a bandwidth of 20 MHz), the mobile station can receive a plurality of DFT-S-OFDM signals. Is transmitted. At this time, frequency resources with good radio quality are allocated to the mobile station for each CC by frequency scheduling. Therefore, for example, as shown in FIG. 8, the frequency resource amount allocated to each CC may differ between CCs (see CC # 0, CC # 1, CC # 2 in FIG. 8). The communication quality is measured by the base station based on the SRS transmitted by the mobile station. The base station performs frequency scheduling based on this measurement result. Further, the amount of frequency resources allocated by frequency scheduling is controlled in units of “resource blocks”.
- CA can apply independent transmission power control (TPC) for each CC.
- FIG. 9 is a diagram illustrating an example when transmission power control is performed for each CC.
- the mobile station performs transmission power increase / decrease processing for each CC in accordance with the TPC command notified from the base station. Therefore, as shown in FIG. 9, the transmission power value and power spectral density (PSD) of each CC may differ between CCs.
- the horizontal axis represents frequency
- the vertical axis represents PSD
- the area of the enclosed portion represents the transmission power value of each CC.
- the mobile station calculates the transmission power value of each CC based on the TPC command sent from the base station. Then, the mobile station converts the difference in transmission power between CCs into an amplitude ratio, and adjusts the amplitude of each CC based on the amplitude ratio.
- FIG. 10A and 10B are diagrams illustrating an example of a signal when amplitude adjustment is performed with reference to a CC having the maximum transmission power value.
- FIG. 10A illustrates a signal of a CC having the maximum transmission power value.
- FIG. 10B shows an example of a CC signal with a small transmission power value.
- the solid line waveform is a signal after quantization, and the dotted line waveform is an ideal signal.
- FIG. 11A and 11B are diagrams illustrating an example of a signal when amplitude adjustment is performed on the basis of a CC having a minimum transmission power value.
- FIG. 11A is an example of a signal of a CC having a large transmission power value.
- FIG. 11B shows an example of a CC signal having the minimum transmission power value. Overflow as shown in FIG. 11A can cause signal quality degradation and unnecessary out-of-band interference.
- FIG. 12A and 12B are diagrams illustrating an example of a signal when the number of quantization bits is large (4 bits ⁇ 5 bits), and more specifically, FIG. 12A is an example of a CC signal having a large transmission power value. FIG. 12B shows an example of a CC signal with a small transmission power value.
- a countermeasure can avoid the overflow of the DAC, but on the other hand, the circuit scale of the DAC increases and the power consumption also increases.
- transmission power control is performed by the base station.
- the mobile station transmits information regarding the allowable maximum power difference P MPD between CCs to the base station. Whether the mobile station limits the transmission power value for each CC ( PMPD is a transmission power difference) or the PSD of the transmission power value for each CC (P Limit mode information indicating whether MPD is a PSD difference is transmitted to the base station.
- PMPD is a transmission power difference
- PSD the transmission power value for each CC
- P Limit mode information indicating whether MPD is a PSD difference
- the restriction mode when restricting the transmission power value for each CC is called “inter-CC transmission power difference restriction mode”
- the restriction mode when restricting the PSD of the transmission power value for each CC is “inter-CC PSD difference restriction”. This is called “mode”.
- the mobile station when the mobile station is configured to perform digital synthesis in the time domain as shown in FIG. 6, the mobile station transmits restriction mode information indicating a transmission power difference restriction mode between CCs to the base station.
- restriction mode information indicating the inter-CC PSD difference restriction mode to the base station.
- the restriction mode is uniquely determined according to the configuration of the baseband unit 21 of the mobile station as described above. Therefore, when the mobile station controls the transmission power based on the TPC command sent from the base station, the mobile station sets the maximum power difference between the limited mode and the allowable CC to the base station only once. Just notify me. In the case where the mobile station is configured to include both the baseband units 21 shown in FIGS. 6 and 7, the restriction mode may be changed as appropriate according to the configuration of the baseband unit 21 used for communication. It is good.
- the base station generates a TPC command based on the information regarding the maximum power difference P MPD between CCs received from the mobile station and the restriction mode information. For example, when the limiting mode is the inter-CC transmission power difference limiting mode, the base station generates a TPC command so that the transmission power difference between CCs is within P MPD by comparing the transmission power values of the CCs. When the restriction mode is the inter-CC PSD difference restriction mode, the base station generates a TPC command so that the PSD difference between the CCs is within P MPD by comparing the PSDs of the CCs.
- FIG. 13 is a flowchart illustrating an example of a wireless communication method in the wireless communication system according to the first embodiment.
- the uplink transmission unit 2 receives information on the maximum power difference P MPD between CCs, restriction mode information indicating the transmission power difference restriction mode between CCs or the PSD difference restriction mode between CCs, and the antenna 5 To the base station (S1).
- the reception unit 61 of the uplink reception unit 6 notifies the downlink transmission unit 7 of the information about the maximum power difference P MPD between CCs and the limited mode information received from the mobile station via the antenna 8.
- the scheduler unit 71 performs scheduling based on the communication quality of each CC, and notifies the transmission unit 73 of scheduling information (S3).
- the TPC command generation unit 72 confirms whether the information indicated by the restriction mode information transmitted from the mobile station is the inter-CC transmission power difference restriction mode or the inter-CC PSD difference restriction mode. (S4).
- the TPC command generation unit 72 uses the power so that the transmission power difference between CCs is within P MPD by comparing the transmission power values of the CCs. Adjustment is performed, and a TPC command is generated based on the adjustment result (S5).
- the TPC command generation unit 72 adjusts the power so that the PSD difference between CCs is within P MPD by comparing the PSD of each CC. And a TPC command is generated based on the adjustment result (S6). Then, the transmission unit 73 transmits the scheduling information and the TPC command to the mobile station via the antenna 9 (S7).
- the receiving unit 11 receives the scheduling information and the TPC command sent from the base station via the antenna 4 (S8). Then, the scheduling information is notified to the uplink transmission unit 2. Thereby, the uplink transmission part 2 becomes possible to allocate user data to each CC based on scheduling information. In addition, the reception unit 11 notifies the transmission power control unit 3 of the TPC command received from the base station.
- the CC transmission power calculation unit 31 calculates the transmission power value of the corresponding CC based on the TPC command, and notifies the amplitude adjustment coefficient calculation unit 32 of the calculation result (S9).
- the amplitude adjustment coefficient calculation unit 32 calculates the amplitude adjustment coefficient from the ratio of the transmission power values of the CCs when the own station supports the inter-CC transmission power difference limiting mode, and uses the calculation result as the amplitude of the baseband unit 21. The adjustment unit is notified (S9).
- the amplitude adjustment coefficient calculation unit 32 converts the transmission power value of each CC into a PSD, and calculates the amplitude adjustment coefficient from the PSD ratio of each CC.
- the calculation result is notified to each amplitude adjustment unit of the baseband unit 21 (S9). Also, the amplitude adjustment coefficient calculation unit 32 calculates the total power for all CCs from the transmission power value of each CC, and notifies the calculation result to the PA of the RF unit 22 (S9).
- the baseband unit 21 digitally synthesizes a user data signal whose amplitude is adjusted for each CC in the time domain. Then, the RF unit 22 amplifies the combined user data signal to the total power for all CCs, and transmits the amplified signal to the base station via the antenna 5 (S10).
- the baseband unit 21 digitally synthesizes the user data signal whose amplitude is adjusted for each CC in the frequency domain. Then, the RF unit 22 amplifies the combined user data signal to the total power for all CCs, and transmits the amplified signal to the base station via the antenna 5 (S10).
- the receiving unit 61 receives a user data signal transmitted from the mobile station via the antenna 8 (S11).
- the mobile station notifies the allowable maximum power difference between CCs and the limit mode to the base station, and the base station transmits the transmission power difference (or PSD difference) between CCs according to the limit mode. ) Is generated so as to be within the allowable maximum power difference.
- transmission power control TPC
- TPC transmission power control
- the mobile station performs transmission power control based on the TPC command generated so that the transmission power difference (or PSD difference) between CCs is within the allowable maximum power difference.
- the mobile station autonomously controls transmission power when receiving a TPC command from the base station.
- FIG. 14 is a diagram illustrating a configuration example of a mobile station in a wireless communication system
- FIG. 15 is a diagram illustrating a configuration example of a base station in the wireless communication system.
- the configuration example of the mobile station and the base station lists the configuration related to the processing of the present embodiment for convenience of description, and does not represent all the functions of the mobile station and the base station. Further, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the receiving unit 61a of the uplink receiving unit 6a performs processing for receiving data transmitted from the mobile station
- the TPC command generating unit 72a of the downlink transmitting unit 7a is set to the restricted mode. Regardless, a known TPC command generation process is performed.
- the mobile station has a downlink receiving unit 1, an uplink transmitting unit 2a, and a transmission power control unit 3a.
- the uplink transmission unit 2 a includes a baseband unit 21 and an RF unit 22, encodes user data assigned to a predetermined CC based on scheduling information, and transmits the encoded user data to the base station via the antenna 5.
- FIG. 16 is a diagram illustrating a configuration example of the transmission power control unit 3a.
- the transmission power control unit 3 a includes a CC transmission power calculation unit 31, an inter-CC power limiting unit 33, and an amplitude adjustment coefficient calculation unit 32.
- the inter-CC power limiting unit 33 adjusts (limits) the transmission power value of each CC or the PSD of each CC based on the maximum allowable power difference P MPD between CCs.
- the downlink reception unit 1, the uplink transmission unit 2a, and the transmission power control unit 3a can be configured by, for example, a CPU, an FPGA, a memory, and the like.
- FIG. 17 is a flowchart illustrating an example of a wireless communication method in the wireless communication system according to the second embodiment.
- the transmission unit 73 of the downlink transmission unit 7a transmits the TPC command generated by the TPC command generation unit 72a and the scheduling information generated by the scheduler unit 71 to the mobile station via the antenna 9. (S21).
- the receiving unit 11 of the downlink receiving unit 1 receives the scheduling information and the TPC command transmitted from the base station via the antenna 4 (S22). Then, the reception unit 11 notifies the scheduling information to the uplink transmission unit 2a. Thereby, the uplink transmission part 2a becomes possible to allocate user data to each CC based on scheduling information. In addition, the receiving unit 11 notifies the transmission power control unit 3a of the TPC command received from the base station.
- P i represents the transmission power value of the i-th CC
- N cc represents the number of CCs.
- the inter-CC power limiting unit 33 determines whether the limiting mode corresponding to the own station is the inter-CC transmission power difference limiting mode or the inter-CC PSD difference limiting mode (S24). As a result, in the case of the inter-CC transmission power difference restriction mode (S24, Yes), the inter-CC power restriction unit 33 first obtains the minimum value P min from the transmission power value P i of each CC. Then, the inter-CC power limiting unit 33 determines that Pi i (P i (P min + P MPD) when the transmission power value P i of the i-th CC exceeds the value “P min + P MPD ” obtained by adding the maximum power difference P MPD to the minimum value P min.
- the inter-CC power restriction unit 33 first converts the transmission power value P i into a power value per resource block (i The number of the first resource block is M i ).
- the conversion value (PSD) of each CC is “P i ⁇ 10 log 10 M i ”.
- the inter-CC power limiting unit 33 obtains the minimum value P min ′ from the PSD of each CC.
- the inter-CC power limiting unit 33 sets the PSD of the CC.
- the amplitude adjustment coefficient calculation unit 32 of the transmission power control unit 3a calculates the amplitude adjustment coefficient from the ratio of the transmission power values of the CCs when the own station supports the inter-CC transmission power difference limiting mode, and the calculation. The result is notified to each amplitude adjustment unit of the baseband unit 21 (S27).
- the amplitude adjustment coefficient calculation unit 32 calculates the amplitude adjustment coefficient from the PSD ratio of each CC, and the calculation result is used as each amplitude adjustment of the baseband unit 21. (S27). Further, the amplitude adjustment coefficient calculation unit 32 calculates the total power for all CCs from the transmission power value of each CC, and notifies the PA of the RF unit 22 of the calculation result (S27).
- the baseband unit 21 digitally synthesizes a user data signal whose amplitude is adjusted for each CC in the time domain. Then, the RF unit 22 amplifies the combined user data signal to the total power for all CCs, and transmits the amplified signal to the base station via the antenna 5 (S28).
- the baseband unit 21 digitally synthesizes the user data signal whose amplitude is adjusted for each CC in the frequency domain. Then, the RF unit 22 amplifies the combined user data signal to the total power for all CCs, and transmits the amplified signal to the base station via the antenna 5 (S28).
- the receiving unit 61a of the uplink receiving unit 6a receives the user data signal transmitted from the mobile station via the antenna 8 (S29).
- the mobile station determines information regarding the maximum power difference P MPD between CCs and limit mode information (inter-CC transmission power difference limit mode or inter-CC PSD) according to the configuration of the mobile station.
- the difference limit mode may be notified to the base station.
- the transmission power difference (or PSD difference) between the CCs is within the allowable maximum power difference according to the restriction mode of the local station.
- the transmission power was controlled autonomously so that As a result, transmission power control (TPC) can be performed within the range of the number of quantization bits, so that signal quality deterioration can be suppressed without increasing the DAC circuit scale.
- the mobile station notifies the base station of the maximum allowable power difference between CCs and the restriction mode, and the base station transmits the TPC command generated according to the restriction mode to the mobile station.
- the process in case a mobile station notifies the allowable maximum power difference between CC to a base station, and does not notify a restriction
- FIG. 18 is a diagram illustrating a configuration example of a mobile station in a wireless communication system
- FIG. 19 is a diagram illustrating a configuration example of a base station in the wireless communication system.
- the configuration example of the mobile station and the base station lists the configuration related to the processing of the present embodiment for convenience of description, and does not represent all the functions of the mobile station and the base station. Further, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the mobile station includes a downlink reception unit 1, an uplink transmission unit 2b, and a transmission power control unit 3b.
- the uplink transmission unit 2 b includes a baseband unit 21 and an RF unit 22, encodes user data assigned to a predetermined CC based on scheduling information, and the maximum power difference P MPD between CCs, Send to the station.
- the transmission power control unit 3b controls transmission power based on TPC commands (corresponding to first and second TPC commands described later) notified from the base station.
- FIG. 20 is a diagram illustrating a configuration example of the transmission power control unit 3b.
- the transmission power control unit 3 b includes a TPC command identification unit 34, a CC transmission power calculation unit 31, and an amplitude adjustment coefficient calculation unit 32.
- the TPC command identifying unit 34 identifies a TPC command corresponding to the configuration of the baseband unit 21 of the local station from the first and second TPC commands transmitted by the base station, and notifies the CC transmission power calculating unit 31 of the TPC command.
- the downlink reception unit 1, the uplink transmission unit 2b, and the transmission power control unit 3b can be configured by, for example, a CPU, an FPGA, a memory, and the like.
- the base station includes an uplink receiving unit 6b and a downlink transmitting unit 7b.
- the reception unit 61b receives the maximum power difference P MPD between CCs transmitted from the mobile station via the antenna 8, and downlinks the maximum power difference P MPD between CCs after decoding. Notify the transmitter 7b.
- the TPC command generation unit 72b corresponds to the inter-CC transmission power difference limiting mode (mode for limiting the transmission power value) based on the maximum power difference P MPD between CCs after decoding. A first TPC command is generated.
- the TPC command generation unit 72b generates a second TPC command corresponding to the inter-CC PSD difference limiting mode (a mode for limiting PSD) based on the maximum power difference P MPD between CCs after decoding. Then, the transmission unit 73 is notified of each generated TPC command.
- the uplink receiving unit 6b and the downlink transmitting unit 7b can be configured by, for example, a CPU, FPGA, memory, and the like.
- FIG. 21 is a flowchart illustrating an example of a wireless communication method in the wireless communication system according to the third embodiment.
- the uplink transmitter 2b transmits information on the maximum power difference P MPD between CCs to the base station via the antenna 5 (S31).
- the reception unit 61b of the uplink reception unit 6b notifies the downlink transmission unit 7b of information on the maximum power difference P MPD between CCs received from the mobile station via the antenna 8 (S32).
- the scheduler unit 71 performs scheduling based on the communication quality of each CC, and notifies the transmission unit 73 of scheduling information (S3).
- the TPC command generation unit 72b of the base station generates a TPC command so that the transmission power difference between CCs is within P MPD by comparing the transmission power values of the CCs (S33). That is, here, a first TPC command corresponding to the inter-CC transmission power difference limiting mode is generated. Then, the TPC command generation unit 72b associates the first TPC command with the first identification information for identifying the first TPC command and notifies the transmission unit 73 (S33).
- the TPC command generation unit 72b generates a TPC command so that the PSD difference between CCs is within P MPD in the comparison of the PSD of each CC (S34). That is, here, the second TPC command corresponding to the inter-CC PSD difference limiting mode is generated. Then, the TPC command generation unit 72b associates the second TPC command with the second identification information for identifying the second TPC command, and notifies the transmission unit 73 (S34).
- the transmission unit 73 transmits the scheduling information, each TPC command, and identification information associated with each TPC command to the mobile station via the antenna 9 (S35).
- the first identification information and the second identification information are information known in advance in the mobile station and the base station.
- the receiving unit 11 receives the scheduling information, each TPC command, and identification information associated with each TPC command sent from the base station via the antenna 4 (S36). Then, the reception unit 11 notifies the scheduling information to the uplink transmission unit 2b. Thereby, the uplink transmission part 2b can allocate user data to each CC based on scheduling information. In addition, the receiving unit 11 notifies the transmission power control unit 3b of each TPC command and identification information associated with each TPC command.
- the TPC command identification unit 34 detects a TPC command associated with the identification information corresponding to the restriction mode of the own station based on the notified identification information, and the TPC command is transmitted to the CC transmission power.
- the calculation unit 31 is notified (S37).
- the CC transmission power calculation unit 31 calculates the transmission power value of the corresponding CC based on the notified TPC command, and notifies the amplitude adjustment coefficient calculation unit 32 of the calculation result (S37).
- the amplitude adjustment coefficient calculation unit 32 calculates the amplitude adjustment coefficient from the ratio of the transmission power values of the CCs when the own station supports the inter-CC transmission power difference restriction mode, and the calculation result is used as the amplitude of the baseband unit 21.
- the adjustment unit is notified (S37).
- the amplitude adjustment coefficient calculation unit 32 converts the transmission power value of each CC into PSD, and calculates the amplitude adjustment coefficient from the PSD ratio of each CC. Then, the calculation result is notified to each amplitude adjustment unit of the baseband unit 21 (S37). In addition, the amplitude adjustment coefficient calculation unit 32 calculates the total power for all CCs from the transmission power value of each CC, and notifies the PA of the RF unit 22 of the calculation result (S37). Thereafter, the mobile station transmits data to the base station by the same operation as in the first embodiment.
- the mobile station notifies the base station of the allowable maximum power difference between CCs.
- the base station generates the first TPC command so that the transmission power difference between CCs is within the allowable maximum power difference, and at the same time, the base station generates the first TPC command so that the PSD difference between CCs is within the allowable maximum power difference. 2 TPC commands are generated.
- the mobile station controls transmission power using a TPC command (first or second TPC command) corresponding to the restriction mode of the local station.
- TPC transmission power control
- the base station transmits each TPC command in association with identification information for identifying each TPC command.
- the mobile station can reliably detect the TPC command corresponding to the restriction mode of the local station.
Abstract
Description
2,2a,2b 上りリンク送信部
3,3a,3b 送信電力制御部
4,5,8,9 アンテナ
6,6a,6b 上りリンク受信部
7,7a,7b 下りリンク送信部
11,61,61a,61b 受信部
21 ベースバンド部
22 RF部
31 CC送信電力計算部
32 振幅調整係数計算部
33 CC間電力制限部
34 TPCコマンド識別部
71 スケジューラ部
72,72a,72b TPCコマンド生成部
73 送信部
101-1,101-2,101-3 変調部
102-1,102-2,102-3 DFT部
103-1,103-2,103-3,122 IFFT部
104-1,104-2,104-3 アップサンプリング部
105-1,105-2,105-3 周波数シフト部
106-1,106-2,106-3,121-1,121-2,121-3 振幅調整部
107 合成部
111 DAC部
112 直交変換器
113 PA部
Claims (25)
- 複数の周波数帯域を同時に使用して無線通信可能な無線通信システムにおいて、
移動局が、
周波数帯域間の許容電力差と、自局の送信電力制御における電力制限の対象を示すモード情報と、を基地局に送信する上り送信部と、
前記基地局から受信した送信電力制御コマンドに基づいて送信電力を制御する送信電力制御部と、
を有し、
前記基地局が、
前記周波数帯域間の許容電力差および前記モード情報に基づいて送信電力制御コマンドを生成する生成部と、
前記送信電力制御コマンドを前記移動局に送信する下り送信部と、
を有する、
ことを特徴とする無線通信システム。 - 前記電力制限の対象を、各周波数帯域の送信電力値または当該送信電力値の電力スペクトル密度とする、
ことを特徴とする請求項1に記載の無線通信システム。 - 前記基地局の生成部は、
前記電力制限の対象が各周波数帯域の送信電力値の場合、当該送信電力値の比較で各周波数帯域間の送信電力差が前記許容電力差以内になるように電力制限を行い、
前記電力制限の対象が各周波数帯域の送信電力値の電力スペクトル密度の場合、当該電力スペクトル密度の比較で各周波数帯域間の電力スペクトル密度差が前記許容電力差以内になるように電力制限を行い、
前記電力制限の結果に基づいて送信電力制御コマンドを生成する、
ことを特徴とする請求項2に記載の無線通信システム。 - 複数の周波数帯域を同時に使用して無線通信可能な無線通信システムにおいて、
基地局が、
送信電力制御コマンドを生成する生成部と、
前記送信電力制御コマンドを移動局に送信する下り送信部と、
を有し、
前記移動局が、
前記基地局から送信電力制御コマンドを受信する受信部と、
前記受信部で送信電力制御コマンドを受信した場合に、周波数帯域間の許容電力差に基づいて電力制限の対象となる電力値を制限し、当該制限処理の結果に基づいて送信電力を制御する送信電力制御部と、
を有する、
ことを特徴とする無線通信システム。 - 前記電力制限の対象となる電力値を、各周波数帯域の送信電力値または当該送信電力値の電力スペクトル密度とする、
ことを特徴とする請求項4に記載の無線通信システム。 - 前記移動局の送信電力制御部は、
前記電力制限の対象となる電力値が各周波数帯域の送信電力値の場合、各周波数帯域間の送信電力差が前記許容電力差以内になるように送信電力値を制限し、
前記電力制限の対象となる電力値が各周波数帯域の送信電力値の電力スペクトル密度の場合、各周波数帯域の送信電力値をそれぞれの電力スペクトル密度に換算し、各周波数帯域間の電力スペクトル密度差が前記許容電力差以内になるように電力スペクトル密度を制限する、
ことを特徴とする請求項5に記載の無線通信システム。 - 複数の周波数帯域を同時に使用して無線通信可能な無線通信システムにおいて、
移動局が、
周波数帯域間の許容電力差を基地局に送信する上り送信部、
を有し、
前記基地局が、
前記周波数帯域間の許容電力差に基づいて、第1の電力制限の対象に対応する第1の送信電力制御コマンドを生成し、並行して、第2の電力制限の対象に対応する第2の送信電力制御コマンドを生成する生成部と、
前記生成部にて生成された第1および第2の送信電力制御コマンドを前記移動局に送信する下り送信部と、
を有し、
前記移動局が、さらに、
前記基地局から前記第1および第2の送信電力制御コマンドを受信する受信部と、
前記第1および第2の送信電力制御コマンドから、自局の送信電力制御における電力制限の対象に対応する所望の送信電力制御コマンドを検出し、当該検出結果に基づいて送信電力を制御する送信電力制御部と、
を有する、
ことを特徴とする無線通信システム。 - さらに、
前記基地局の生成部は、前記各送信電力制御コマンドに、それぞれを識別するための識別情報を関連付けておき、
前記移動局の送信電力制御部は、前記所望の送信電力制御コマンドを、自局と前記基地局との間で予め既知の前記識別情報に基づいて検出する、
ことを特徴とする請求項7に記載の無線通信システム。 - 前記第1の電力制限の対象を、各周波数帯域の送信電力値とし、前記第2の電力制限の対象を、当該送信電力値の電力スペクトル密度とする、
ことを特徴とする請求項7に記載の無線通信システム。 - 前記基地局の生成部は、
前記各周波数帯域の送信電力値の比較で、送信電力差が前記許容電力差以内になるように電力制限を行い、その結果に基づいて第1の送信電力制御コマンドを生成し、
前記各周波数帯域の送信電力値の電力スペクトル密度の比較で、電力スペクトル密度差が前記許容電力差以内になるように電力制限を行い、その結果に基づいて第2の送信電力制御コマンドを生成する、
ことを特徴とする請求項9に記載の無線通信システム。 - 複数の周波数帯域を同時に使用して無線信号を送受信可能な移動局において、
自局の送信電力制御における電力制限の対象を示すモード情報を基地局に送信する送信部と、
前記基地局から受信した送信電力制御コマンドに基づいて送信電力を制御する送信電力制御部と、
を有する、
ことを特徴とする移動局。 - 前記送信部が、さらに、周波数帯域間の許容電力差を基地局に送信する、
ことを特徴とする請求項11に記載の移動局。 - 前記基地局が前記周波数帯域間の許容電力差および前記モード情報に基づいて生成した送信電力制御コマンドを受信する受信部、
をさらに有する、
ことを特徴とする請求項12に記載の移動局。 - 前記電力制限の対象を、各周波数帯域の送信電力値または当該送信電力値の電力スペクトル密度とする、
ことを特徴とする請求項11、12または13に記載の移動局。 - 複数の周波数帯域を同時に使用して無線信号を送受信可能な移動局において、
基地局から送信電力制御コマンドを受信する受信部と、
前記受信部で送信電力制御コマンドを受信した場合に、周波数帯域間の許容電力差に基づいて電力制限の対象となる電力値を制限し、当該制限処理の結果に基づいて送信電力を制御する送信電力制御部と、
を有する、
ことを特徴とする移動局。 - 前記電力制限の対象となる電力値を、各周波数帯域の送信電力値または当該送信電力値の電力スペクトル密度とする、
ことを特徴とする請求項15に記載の移動局。 - 前記送信電力制御部は、
前記電力制限の対象となる電力値が各周波数帯域の送信電力値の場合、各周波数帯域間の送信電力差が前記許容電力差以内になるように送信電力値を制限し、
前記電力制限の対象となる電力値が各周波数帯域の送信電力値の電力スペクトル密度の場合、各周波数帯域の送信電力値をそれぞれの電力スペクトル密度に換算し、各周波数帯域間の電力スペクトル密度差が前記許容電力差以内になるように電力スペクトル密度を制限する、
ことを特徴とする請求項16に記載の移動局。 - 複数の周波数帯域を同時に使用して無線信号を送受信可能な移動局において、
周波数帯域間の許容電力差を基地局に送信する送信部と、
前記基地局が、前記周波数帯域間の許容電力差に基づいて生成した第1の電力制限の対象に対応する第1の送信電力制御コマンドと、並行して前記許容電力差に基づいて生成した第2の電力制限の対象に対応する第2の送信電力制御コマンドと、を受信する受信部と、
前記第1および第2の送信電力制御コマンドから、自局の送信電力制御における電力制限の対象に対応する所望の送信電力制御コマンドを検出し、当該検出結果に基づいて送信電力を制御する送信電力制御部と、
を有する、
ことを特徴とする移動局。 - さらに、前記送信電力制御部は、前記所望の送信電力制御コマンドを、自局と前記基地局との間で予め既知である、各送信電力制御コマンドを識別するための識別情報に基づいて検出する、
ことを特徴とする請求項18に記載の移動局。 - 前記自局の送信電力制御における電力制限の対象を、各周波数帯域の送信電力値または当該送信電力値の電力スペクトル密度とする、
ことを特徴とする請求項18または19に記載の移動局。 - 複数の周波数帯域を同時に使用して無線信号を送受信可能な基地局において、
移動局が送信する周波数帯域間の許容電力差と当該移動局の送信電力制御における電力制限の対象を示すモード情報とに基づいて、送信電力制御コマンドを生成する生成部と、
前記送信電力制御コマンドを前記移動局に送信する送信部と、
を有する、
ことを特徴とする基地局。 - 複数の周波数帯域を同時に使用して無線信号を送受信可能な基地局において、
移動局から受信した周波数帯域間の許容電力差に基づいて、第1の電力制限の対象に対応する第1の送信電力制御コマンドを生成し、並行して、第2の電力制限の対象に対応する第2の送信電力制御コマンドを生成する生成部と、
前記生成部にて生成された第1および第2の送信電力制御コマンドを前記移動局に送信する送信部と、
を有する、
ことを特徴とする基地局。 - 複数の周波数帯域を同時に使用して無線通信可能な無線通信システムにおける無線通信方法であって、
移動局が、周波数帯域間の許容電力差と、自局の送信電力制御における電力制限の対象を示すモード情報とを基地局に送信し、
前記基地局が、前記周波数帯域間の許容電力差および前記モード情報に基づいて送信電力制御コマンドを生成し、当該送信電力制御コマンドを前記移動局に送信し、
前記移動局が、前記基地局から受信した送信電力制御コマンドに基づいて送信電力を制御する、
ことを特徴とする無線通信方法。 - 複数の周波数帯域を同時に使用して無線通信可能な無線通信システムにおける無線通信方法であって、
基地局が、送信電力制御コマンドを生成し、当該送信電力制御コマンドを移動局に送信し、
前記移動局が、前記基地局から送信電力制御コマンドを受信した場合に、周波数帯域間の許容電力差に基づいて電力制限の対象となる電力値を制限し、当該制限処理の結果に基づいて送信電力を制御する、
ことを特徴とする無線通信方法。 - 複数の周波数帯域を同時に使用して無線通信可能な無線通信システムにおける無線通信方法であって、
移動局が、周波数帯域間の許容電力差を基地局に送信し、
前記基地局が、前記周波数帯域間の許容電力差に基づいて、第1の電力制限の対象に対応する第1の送信電力制御コマンドを生成し、並行して、第2の電力制限の対象に対応する第2の送信電力制御コマンドを生成し、当該第1および第2の送信電力制御コマンドを前記移動局に送信し、
前記移動局が、前記基地局から前記第1および第2の送信電力制御コマンドを受信し、当該第1および第2の送信電力制御コマンドから、自局の送信電力制御における電力制限の対象に対応する所望の送信電力制御コマンドを検出し、当該検出結果に基づいて送信電力を制御する、
ことを特徴とする無線通信方法。
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Also Published As
Publication number | Publication date |
---|---|
JP5573965B2 (ja) | 2014-08-20 |
EP2661132A1 (en) | 2013-11-06 |
EP2661132B1 (en) | 2017-06-21 |
EP2661132A4 (en) | 2016-01-06 |
US20130281148A1 (en) | 2013-10-24 |
JPWO2012090327A1 (ja) | 2014-06-05 |
US9560606B2 (en) | 2017-01-31 |
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