WO2013128605A1 - Dispositif d'émission, dispositif de réception, procédé de commande de puissance d'émission et programme - Google Patents

Dispositif d'émission, dispositif de réception, procédé de commande de puissance d'émission et programme Download PDF

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Publication number
WO2013128605A1
WO2013128605A1 PCT/JP2012/055147 JP2012055147W WO2013128605A1 WO 2013128605 A1 WO2013128605 A1 WO 2013128605A1 JP 2012055147 W JP2012055147 W JP 2012055147W WO 2013128605 A1 WO2013128605 A1 WO 2013128605A1
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WIPO (PCT)
Prior art keywords
path loss
calculation method
loss value
transmission
reception
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PCT/JP2012/055147
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English (en)
Japanese (ja)
Inventor
大介 実川
田中　良紀
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富士通株式会社
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Priority to PCT/JP2012/055147 priority Critical patent/WO2013128605A1/fr
Publication of WO2013128605A1 publication Critical patent/WO2013128605A1/fr

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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
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • 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
    • 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
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • 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

Definitions

  • the present invention relates to a transmission device, a reception device, a transmission power control method, and a program.
  • LTE Long Term Evolution
  • 3GPP Release 8 Long Term Evolution-Advanced (Release 10)
  • 3GPP Third Generation Partnership Project
  • FIG. 2 is a diagram for explaining CoMP reception.
  • the RP includes a macro base station (eNB: Enhanced Node-B), pico base station, RRH (Remote Radio Head), etc., but these are not distinguished in FIG.
  • RP1 is the RP of the “connected cell”.
  • the UE 1 exchanges control signals and the like with the RP of the connected cell.
  • RP2 is the RP of the “cooperative cell”.
  • the RP of the cooperative cell transfers information based on the received signal from UE1 to RP1.
  • the following two methods are conceivable as the contents of information transferred from the RP of the cooperative cell to the RP of the connected cell and the combining method in the RP of the connected cell.
  • the RP of the cooperative cell performs demodulation and decoding of the signal transmitted from the UE, and transfers the result, that is, user data and decoding success / failure to the RP of the connected cell. Then, the RP of the connected cell selectively uses the result of self-demodulating and decoding the signal transmitted from the UE and the result transferred from the RP of the cooperative cell.
  • the RP of the cooperative cell transfers the signal itself and the channel estimation value received from the UE to the RP of the connected cell. Then, the RP of the connected cell performs demodulation and decoding in a batch using the signal and channel estimation value received by itself from the UE and the reception signal and channel estimation value from the RP of the cooperative cell. In the following description, the latter method will be described, but the present invention is not limited to this.
  • the RP of the cooperative cell When selecting the RP of the cooperative cell from the RPs of cells other than the connected cell, it is preferable to select an RP that can be expected to have the effect of cooperative reception.
  • a method for selecting the RP of the coordinated cell for example, a cell in which the downlink received power measurement value (RSRP) of each cell fed back from the UE is used as a determination criterion, and the RSRP difference from the connected cell is within a specified threshold value. There is a way to choose.
  • RSRP downlink received power measurement value
  • a method for selecting an RP of a cooperative cell a method using a path loss estimated based on RSRP as a determination criterion is also known.
  • RP3 shown in FIG. 2 is a RP of a cell that does not perform cooperative reception, that is, a non-cooperative cell, and allocates radio resources to UE2 different from UE1 without cooperation with RP1 and RP2. For this reason, the data signal transmitted from UE1 and the data signal transmitted from UE2 may interfere with each other.
  • the transmission power control (TPC) scheme has a great influence on the throughput characteristics.
  • TPC transmission power control
  • PUSCH uplink shared channel
  • P CMAX, c (i) is the maximum transmission power.
  • M PUSCH, c (i) is the size of the allocated frequency resource (RB: Resource Block).
  • PL C is the path loss estimated using the downlink signal, i.e. the propagation loss.
  • ⁇ is a path loss coefficient. When the value of ⁇ is 1.0, the path loss is completely compensated.
  • ⁇ TF, c (i) is an offset value for each modulation and coding scheme (MCS).
  • f c (j) is an offset value by closed loop control using a TPC command. Important among these parameters are involved in open-loop TPC for compensating for path loss, P 0_PUSCH, c (j) , ⁇ , and a PL C.
  • the transmission power is increased so that a reception quality of a certain level or higher can be obtained in any cooperative cell.
  • the throughput of the UE to which JR is applied is higher in the case of the reference path loss calculation method (b) than in the case of the reference path loss calculation method (a).
  • the position of the UE to which JR is applied there is a possibility of causing large interference to neighboring cells.
  • the transmission power is adjusted so that a certain reception quality or higher is obtained in any one of the cooperative cells.
  • the reference path loss calculation method (c) is basically based on the same concept as the reference path loss calculation method (a). However, in a heterogeneous network in which RPs having different transmission powers are mixed, the RP of the minimum path loss and the RP of the connected cell are not always the same, so the reference path loss calculation method (c) should explicitly compensate for the minimum path loss. It is what. However, if there is a large difference in the path loss of the RP that is cooperatively received, the transmission power is adjusted to be small, so in the case of the reference path loss calculation method (c), the throughput improvement due to JR becomes slight.
  • the reception quality after the reception signal is synthesized between the RPs is made constant. That is, the transmission power is reduced in anticipation of the gain by JR. For this reason, the throughput of the UE to which JR is applied is basically the same as the throughput when JR is not applied.
  • the reference path loss calculation method (d) interference from the UE to which the JR is applied to the adjacent cell is reduced. For this reason, there is an effect that the throughput of each UE including the UE to which JR is not applied is improved.
  • the disclosed technology has been made in view of the above, and an object thereof is to provide a transmission device, a reception device, a transmission power control method, and a program capable of improving the throughput characteristics of the entire system.
  • the transmitting apparatus disclosed in the present application is a transmitting apparatus in which a transmission signal by the own apparatus is received by cooperative reception by a plurality of receiving apparatuses, and adjusts the amplitude of the transmission signal based on a set transmission power value And a calculation unit that calculates received power of a reference signal transmitted from another receiving device that does not perform the cooperative reception, and interference with respect to the other receiving device related to the transmitted signal according to the calculated received power Based on the amount, a reference path loss value calculation method is selected from a plurality of calculation method candidates, and a transmission power value set in the adjustment unit is calculated using a reference path loss value calculated using the selected calculation method.
  • a control unit is a control unit.
  • the transmission device the reception device, the transmission power control method, and the program disclosed in the present application, it is possible to improve the throughput characteristics of the entire system.
  • FIG. 1 is a diagram for explaining CoMP transmission / reception technology.
  • FIG. 2 is a diagram for explaining CoMP reception.
  • FIG. 3 is a diagram conceptually showing the relationship between the geographical position of the UE to which JR is applied and the transmission power.
  • FIG. 4 is a diagram conceptually illustrating the influence of a UE to which JR is applied on the RP of a non-cooperative cell.
  • FIG. 5 is a diagram illustrating an example of a communication system according to the first embodiment.
  • FIG. 6 is a block diagram illustrating an example of a terminal according to the first embodiment.
  • FIG. 7 is a diagram illustrating an example of the cooperative reception base station group according to the first embodiment.
  • FIG. 8 is a diagram illustrating an example of a processing operation of the communication system according to the first embodiment.
  • FIG. 9 is a flowchart illustrating an example of transmission power control in the terminal according to the first embodiment.
  • FIG. 10 is a diagram for explaining an example of a switching pattern of the reference path loss calculation method according to the first embodiment.
  • FIG. 11 is a diagram for explaining an example of a switching pattern of the reference path loss calculation method according to the first embodiment.
  • FIG. 12 is a diagram illustrating an example of switching of the reference path loss calculation method when the interference amount in the non-cooperative cell is used as a reference for switching the reference path loss calculation method.
  • FIG. 13 is a flowchart illustrating an example of transmission power control in the terminal according to the second embodiment.
  • FIG. 14 is a diagram for explaining an example of a switching pattern of the reference path loss calculation method according to the second embodiment.
  • FIG. 15 is a diagram for explaining another example of the switching pattern of the reference path loss calculation method according to the second embodiment.
  • FIG. 16 is a diagram illustrating a hardware configuration of the terminal.
  • FIG. 17 is a diagram
  • FIG. 3 is a diagram conceptually showing the relationship between the geographical position of the UE to which JR is applied and the transmission power. Assuming that the RP of the connected cell and the RP of the cooperative cell exist in a location that is close to some extent as shown in FIG. 1, for example, and that the RP of the non-cooperative cell exists relatively far away, In the case of a UE to which JR is applied, which is close to the RP, the transmission power is relatively low. Then, as the UE to which the JR is applied moves away from the RP of the connected cell and the RP of the cooperative cell, the transmission power of the UE to which the JR is applied is considered to be relatively high. FIG.
  • FIG. 4 is a diagram conceptually illustrating the influence of the UE to which JR is applied on the RP of the non-cooperative cell. Assuming that the transmission power of the UE to which the JR is applied is the same, of course, the non-cooperative cell is smaller when the path loss from the RP of the non-cooperative cell is small (FIG. 4A) (FIG. 4B). The interference given to the RP increases.
  • the UE to which JR is applied may increase the transmission power unnecessarily. This is not a good idea in terms of characteristics. On the other hand, if the UE to which JR is applied unnecessarily decreases the transmission power, it is considered that its own throughput is significantly reduced. Focusing on these characteristics, the following examples were conceived.
  • FIG. 5 is a diagram illustrating an example of a communication system according to the first embodiment.
  • the communication system 10 includes a terminal 20, a base station 30, a base station 40, and a base station 50.
  • the base station 30 and the base station 40 correspond to the base station of the connected cell and the base station of the cooperative cell that receive the data signal transmitted from the terminal 20 in a coordinated manner.
  • the base station 30 of the connected cell transmits “information regarding a measurement set” to the terminal 20.
  • the measurement set is information for specifying the transmission source base station of the reference signal for the terminal 20 to measure the received power.
  • the measurement set includes not only the base station 30 and the base station 40 of the cell related to coordinated reception but also information about the cell base station 50 not related to coordinated reception.
  • the base station 50 is a non-cooperative cell base station that does not participate in cooperative reception of signals transmitted from the terminal 20.
  • the terminal 20 receives information related to the measurement set transmitted from the base station 30 of the connected cell, and based on the reference signals transmitted from each of the plurality of base stations included in the measurement set, the terminal 20 The path loss value between is estimated. And the terminal 20 switches the calculation method of a reference
  • FIG. 6 is a block diagram illustrating an example of a terminal according to the first embodiment.
  • the terminal 20 includes a radio unit 21 and a control unit 22.
  • the radio unit 21 includes a reception RF (Radio Frequency) unit 61 and a transmission RF unit 62.
  • the control unit 22 includes an FFT (Fast Fourier Transform) unit 63, a separation unit 64, a channel estimation unit 65, a control signal demodulation unit 66, an RSRP measurement unit 67, a transmission power control unit 68, and a data signal generation unit. 69, an amplitude adjustment unit 70, a control signal generation unit 71, a reference signal generation unit 72, a multiplexing unit 73, and an IFFT (Inverse Fast Fourier Transform) unit 74.
  • FFT Fast Fourier Transform
  • the reception RF unit 61 receives an OFDM (Orthogonal Frequency-Division Multiplexing) signal transmitted from the base station 30, the base station 40, or the base station 50, and performs radio reception processing (down-conversion, orthogonal demodulation, A / D conversion, etc.) ) And output to the FFT unit 63.
  • a signal transmitted from the base station 30, the base station 40, or the base station 50 includes a downlink data signal.
  • a downlink control signal and a downlink reference signal are taken up.
  • the FFT unit 63 performs an FFT process on the OFDM signal after the radio reception process received from the reception RF unit 61 to convert it into a frequency domain signal.
  • the separating unit 64 separates the received OFDM signal received from the FFT unit 63 into a control signal and a reference signal included therein.
  • the reference signal is output to channel estimation unit 65, and the control signal is output to control signal demodulation unit 66.
  • the channel estimation unit 65 calculates a cross-correlation between a reference signal transmitted from each of a plurality of base stations included in the measurement set notified in advance and a known reference signal replica of each base station. Thereby, the channel estimation value of the radio channel represented by a complex number is obtained for each base station.
  • the control signal demodulator 66 performs channel compensation on the control signal using the channel estimation value, performs demodulation and error correction decoding, and restores control information.
  • the control information includes information related to the measurement set described above, information related to downlink (DL) transmission power, information related to cooperative RP, uplink transmission permission (UL grant), and the like.
  • the RSRP measurement unit 67 calculates RSRP for each of the plurality of base stations included in the notified measurement set. Specifically, the RSRP is obtained by averaging the power value of the channel estimation value obtained by the channel estimation unit 65 within the system bandwidth.
  • the plurality of RSRPs for the plurality of base stations thus calculated may be collectively referred to as an RSRP set below.
  • the transmission power control unit 68 calculates the transmission power value using the target value of the reception level, the path loss coefficient, and the reference path loss. And the transmission power control part 68 switches a reference
  • the relative relationship between the reception quality in any one of a plurality of cells performing cooperative reception and the amount of interference in a non-cooperative cell is used.
  • the relative relationship is, for example, a relative relationship of path loss (PL_ratio).
  • PL_ratio is calculated as follows. That is, first, the path loss of each RP is obtained by subtracting RSRP [dBm] from the transmission power [dBm] of the RP indicated by the information on the downlink transmission power. Next, the path loss value of the RP of the cell related to the cooperative reception and the path loss value of the RP of the non-cooperative cell are obtained based on the information related to the cooperative RP, and PL_ratio is obtained from the ratio thereof. Specifically, as the RP path loss value of a cell related to cooperative reception, for example, the smallest one of the plurality of path loss values obtained for a plurality of cells related to cooperative reception is used. Further, when there are a plurality of non-cooperative cell RPs, the smallest path loss value of the RPs of non-cooperative cells is used.
  • the data signal generation unit 69 generates a data signal corresponding to the specified radio resource and transmission format in accordance with UL transmission permission (UL grant), and outputs the data signal to the amplitude adjustment unit 70.
  • the amplitude adjustment unit 70 adjusts the transmission power of the data signal generated by the data signal generation unit 69 based on the transmission power value calculated by the transmission power control unit 68. That is, the amplitude adjustment unit 70 adjusts the amplitude of the data signal based on the transmission power value calculated by the transmission power control unit 68.
  • the control signal generation unit 71 generates a control signal and outputs it to the multiplexing unit 73.
  • the generated control signal includes the RSRP for each base station calculated by the RSRP measurement unit 67.
  • the reference signal generation unit 72 generates a reference signal and outputs it to the multiplexing unit 73.
  • the multiplexing unit 73 frequency-multiplexes the data signal received from the amplitude adjustment unit 70, the control signal received from the control signal generation unit 71, and the reference signal received from the reference signal generation unit 72 by mapping in the frequency axis, and the multiplexed signal Is output to the IFFT unit 74.
  • the IFFT unit 74 performs IFFT processing on the multiplexed signal received from the multiplexing unit 73 to convert it into a time domain signal (that is, an OFDM signal).
  • the transmission RF unit 62 performs radio transmission processing (D / A conversion, quadrature modulation, up-conversion, etc.) on the OFDM signal received from the IFFT unit 74, and transmits the obtained radio signal via the antenna.
  • radio transmission processing D / A conversion, quadrature modulation, up-conversion, etc.
  • CP Cyclic Prefix
  • CP Cyclic Prefix
  • FIG. 7 is a diagram illustrating an example of the cooperative reception base station group according to the first embodiment.
  • the coordinated reception base station group includes a base station 30 of a connected cell and a base station 40 of the coordinated cell.
  • the base station 30 includes a radio unit 31 and a control unit 32.
  • the radio unit 31 includes a transmission RF unit 81 and a reception RF unit 82.
  • the control unit 32 includes a scheduler 83, a control signal generation unit 84, a reference signal generation unit 85, a multiplexing unit 86, an IFFT unit 87, an FFT unit 88, a separation unit 89, a channel estimation unit 90, and a control unit.
  • a signal demodulator 91 and a cooperative receiver 92 are included.
  • the scheduler 83 controls cooperative reception based on the RSRP set that is included in the control signal from the terminal 20 and fed back. That is, the scheduler 83 performs determination of terminals to which JR is applied, determination of base stations of cooperative cells and non-cooperative cells, and user scheduling.
  • the determined base station of the cooperative cell and the base station of the non-cooperative cell correspond to the measurement set.
  • the control signal generator 84 generates a control signal and outputs it to the multiplexer 86.
  • the control signal includes information on the measurement set, information on downlink transmission power, information on cooperative RP, and uplink transmission permission (UL grant).
  • the reference signal generation unit 85 generates a reference signal and outputs it to the multiplexing unit 86.
  • the multiplexing unit 86 performs frequency multiplexing by mapping the control signal received from the control signal generation unit 84 and the reference signal received from the reference signal generation unit 85 on the frequency axis, and outputs the multiplexed signal to the IFFT unit 87.
  • the IFFT unit 87 performs IFFT processing on the multiplexed signal received from the multiplexing unit 86 to convert it into a time domain signal (that is, an OFDM signal).
  • the transmission RF unit 81 performs radio transmission processing (D / A conversion, quadrature modulation, up-conversion, etc.) on the OFDM signal received from the IFFT unit 87, and transmits the obtained radio signal via the antenna.
  • radio transmission processing D / A conversion, quadrature modulation, up-conversion, etc.
  • the reception RF unit 82 receives the OFDM signal transmitted from the terminal 20, performs radio reception processing (down-conversion, orthogonal demodulation, A / D conversion, etc.), and outputs the result to the FFT unit 88.
  • the FFT unit 88 performs an FFT process on the OFDM signal after the radio reception process received from the reception RF unit 82 to convert it into a frequency domain signal.
  • the separation unit 89 separates the received OFDM signal received from the FFT unit 88 into a control signal, a reference signal, and a data signal included therein.
  • the reference signal is output to the channel estimation unit 90, the control signal is output to the control signal demodulation unit 91, and the data signal is output to the cooperative reception unit 92.
  • the channel estimation unit 90 performs channel estimation between the terminal 20 and its own device using the reference signal transmitted from the terminal 20, and obtains the obtained channel estimation value as a control signal demodulation unit 91, a cooperative reception unit 92, Output to.
  • the control signal demodulator 91 performs channel compensation on the control signal using the channel estimation value, and restores the control information.
  • the control signal is output to the scheduler 83.
  • the control signal includes the RSRP set calculated in the terminal 20.
  • the cooperative reception unit 92 executes cooperative reception based on the data signal transmitted from the terminal 20 and received by the base station 40 of the cooperative cell, which is received by the own device. Specifically, for example, the cooperative reception unit 92 receives the data signal received from the separation unit 89, the channel estimation value received from the channel estimation unit 90, the data signal received from the separation unit 108, and the channel estimation received from the channel estimation unit 109. The maximum ratio synthesis is performed based on the values.
  • the base station 40 includes a radio unit 41 and a control unit 42.
  • the radio unit 41 includes a transmission RF unit 101 and a reception RF unit 102.
  • the control unit 42 includes a scheduler 103, a reference signal generation unit 104, a multiplexing unit 105, an IFFT unit 106, an FFT unit 107, a demultiplexing unit 108, a channel estimation unit 109, and a control signal demodulation unit 110. .
  • the scheduler 103 receives the control signal from the control signal demodulator 110 and controls cooperative reception in cooperation with the scheduler 83.
  • the reference signal generation unit 104 generates a reference signal and outputs it to the multiplexing unit 105.
  • the multiplexing unit 105 performs frequency multiplexing by mapping the reference signal received from the reference signal generation unit 104 on the frequency axis, and outputs the multiplexed signal to the IFFT unit 106.
  • the IFFT unit 106 performs IFFT processing on the multiplexed signal received from the multiplexing unit 105 to convert it into a time domain signal (that is, an OFDM signal).
  • the transmission RF unit 101 performs radio transmission processing (D / A conversion, quadrature modulation, up-conversion, etc.) on the OFDM signal received from the IFFT unit 106, and transmits the obtained radio signal via the antenna.
  • radio transmission processing D / A conversion, quadrature modulation, up-conversion, etc.
  • the reception RF unit 102 receives the OFDM signal transmitted from the terminal 20, performs radio reception processing (down-conversion, orthogonal demodulation, A / D conversion, etc.), and outputs the result to the FFT unit 107.
  • the FFT unit 107 performs an FFT process on the OFDM signal after the radio reception process received from the reception RF unit 102 to convert it to a frequency domain signal.
  • the demultiplexing unit 108 demultiplexes the received OFDM signal received from the FFT unit 107 into a control signal, a reference signal, and a data signal included therein.
  • the reference signal is output to channel estimation section 109
  • the control signal is output to control signal demodulation section 110
  • the data signal is output to cooperative reception section 92.
  • the channel estimation unit 109 performs channel estimation between the terminal 20 and its own device using the reference signal transmitted from the terminal 20, and obtains the obtained channel estimation value as a control signal demodulation unit 110, a cooperative reception unit 92, Output to.
  • the control signal demodulator 110 performs channel compensation on the control signal using the channel estimation value, and restores the control information.
  • the control signal is output to the scheduler 103.
  • FIG. 8 is a diagram illustrating an example of a processing operation of the communication system 10 according to the first embodiment.
  • the base station 30 of the connected cell transmits information on the measurement set to the terminal 20 (step S1).
  • the measurement set includes not only the cell base station 30 and the base station 40 related to coordinated reception, but also information related to the cell base station 50 not related to coordinated reception. That is, an RP that is a RP around the RP of the connection cell and is not directly connected by a high-speed wired line such as an optical fiber and is difficult to perform a cooperative operation is also included in the measurement set.
  • the base station 30, the base station 40, and the base station 50 transmit a reference signal (step S2). This reference signal is transmitted periodically.
  • the terminal 20 determines the RSRP for each of the base station 30, the base station 40, and the base station 50 based on the reference signals transmitted from the base station 30, the base station 40, and the base station 50 included in the measurement set. Is calculated (step S3).
  • the terminal 20 transmits the calculated RSRP set to the base station 30 of the connected cell (step S4).
  • the base station 30 determines a cooperative RP (step S5).
  • the base station 30 notifies the terminal 20 and the base station 40 of information regarding the determined cooperative RP (step S6).
  • the base station 30 and the base station 40 are connected by an optical fiber or the like and perform processing integrally.
  • the base station 30 and the base station 40 execute user scheduling (step S7).
  • user scheduling radio resources are allocated for PUSCH transmission of the terminal 20 based on, for example, the proportional fairness algorithm.
  • the base station 30 transmits UL grant to the terminal 20 (step S8).
  • UL grant indicates the radio resource and transmission format used by the terminal 20.
  • the terminal 20 Upon receiving the UL grant, the terminal 20 controls transmission power (step S9) and transmits uplink data to the base station 30 and the base station 40 (step S10).
  • the base station 30 and the base station 40 cooperatively receive uplink data from the terminal 20 to which JR is applied (step S11). That is, the base station 30 and the base station 40 perform combining processing and decoding processing on the uplink data from the terminal 20 to which JR is applied. Examples of the combining process include a method of performing maximum ratio combining (MRC) across all receiving antennas of the base station 30 and the base station 40.
  • MRC maximum ratio combining
  • FIG. 9 is a flowchart illustrating an example of transmission power control in the terminal 20 according to the first embodiment.
  • the transmission power control unit 68 calculates PL_ratio, which is the RP path loss value of the non-cooperative cell with respect to the RP path loss value of the cell related to cooperative reception (step S21).
  • the transmission power control unit 68 compares the calculated PL_ratio value with the threshold values Th (1), Th (2), and Th (3) (steps S22, S23, and S24).
  • the relationship of the threshold values satisfies Th (1) ⁇ Th (2) ⁇ Th (3).
  • These threshold values may be set in advance in the terminal 20, or may be set in the terminal 20 from the base station by an upper layer signal.
  • the transmission power control unit 68 selects the reference path loss calculation method (b) (step S25). That is, the reference path loss calculation method is switched to the reference path loss calculation method (b) in which the maximum path loss value among the path loss values of a plurality of cells performing cooperative reception is the reference path loss value.
  • the transmission power control unit 68 calculates the reference path loss (a). Is selected (step S26). That is, the reference path loss calculation method is switched to the reference path loss calculation method (a) in which the path loss value of the connected cell is the reference path loss value.
  • the transmission power control unit 68 calculates the reference path loss (d). Is selected (step S27). That is, the reference path loss calculation method is switched to the reference path loss calculation method (d) in which the reciprocal of the path loss of each cell that performs cooperative reception is added, and the reciprocal of the addition result is used as the reference path loss value.
  • the transmission power control unit 68 selects the reference path loss calculation method (c) when the value of PL_ratio is equal to or less than Th (1), that is, when the distance from the non-cooperative cell is relatively close (step S28). That is, the reference path loss calculation method is switched to the reference path loss calculation method (c) in which the minimum path loss value among the path loss values of a plurality of cells performing cooperative reception is used as the reference path loss value.
  • the transmission power control unit 68 calculates transmission power using the reference path loss value calculated by the selected reference path loss calculation method (step S29).
  • FIGS. 10 and 11 are diagrams for explaining an example of a switching pattern of the reference path loss calculation method according to the first embodiment.
  • the reference path loss calculation methods (b), (a), (d), and (c) are sequentially switched.
  • the reference path loss calculation method (c) when the value of PL_ratio is small, that is, when the position of the terminal 20 is close to the non-cooperative cell, the reference path loss calculation method (c) is selected.
  • the reference path loss calculation method (c) is switched to the reference path loss calculation method (d) at the threshold Th (1).
  • the threshold value Th (1) corresponds to, for example, the lowest level at which reception quality by cooperative reception is acceptable. That is, as shown in FIG. 11B, when PL_ratio is small, the transmission power of the terminal 20 to which JR is applied becomes lower by selecting the reference path loss calculation method (d).
  • the reception characteristic of the data signal transmitted from the terminal 20 to which JR is applied is guaranteed to be the same as that in the case where JR is not applied, and it can be avoided that the reception characteristic is significantly lowered.
  • the threshold path Th (2) switches from the reference path loss calculation method (d) to the reference path loss calculation method (a).
  • the reference path loss calculation method (a) is switched to the reference path loss calculation method (b) at the threshold Th (3). That is, as shown in FIG. 11A, when PL_ratio is large, the transmission power of the terminal 20 to which JR is applied is increased by selecting the reference path loss calculation method (b). For this reason, the reception quality is greatly improved by the effect of JR. On the other hand, even if the transmission power is high, the influence on a non-cooperative cell with a large path loss is small.
  • the RSRP measurement unit 67 calculates the received power of the reference signal transmitted from the base station 50 that does not perform cooperative reception. Then, the transmission power control unit 68 performs a reference based on the relative relationship between the reception quality in any one of the base station 30 and the base station 40 that performs cooperative reception and the amount of interference in the base station 50 of the non-cooperative cell. A path loss calculation method is selected from a plurality of calculation method candidates. Then, the transmission power control unit 68 calculates a reference path loss value calculated using the selected reference path loss calculation method, and calculates a transmission power value using the calculated reference path loss value. The plurality of calculation method candidates have different characteristics regarding the transmission power value and the amount of interference with the base station 50 of the non-cooperative cell.
  • the above-mentioned relative relationship is, for example, the path loss value between any one of the base station 30 and the base station 40 that performs cooperative reception and the terminal 20, and the base station 50 and the terminal 20 in the non-cooperative cell. Relative to the path loss value.
  • the reception quality in the relative relationship may be the reception quality at the base station of the connected cell, or may be the reception quality at the base station with the smallest path loss in the base station group performing the cooperative reception.
  • the present invention is not limited to this and may be two or more.
  • the amount of interference in the relative relationship is preferably the amount of interference of the base station with the smallest path loss in the base station group of the non-cooperative cells.
  • FIG. 12 is a diagram illustrating an example of switching of the reference path loss calculation method when the interference amount in the non-cooperative cell is used as a reference for switching the reference path loss calculation method.
  • FIG. 12A is the same as FIG. 10A, and FIG. 12B corresponds to FIG. 10B. As can be seen from FIG.
  • the transmission power control unit 68 only needs to be able to switch the reference path loss calculation method based on the amount of interference in the non-cooperative cell regarding the signal transmitted by the own device.
  • the description has been made on the assumption that all the four reference path loss calculation methods are used.
  • the number and combination of the reference path loss calculation methods used are not limited to this.
  • a combination of the reference path loss calculation method (d) and another reference path loss calculation method is preferable.
  • the other reference path loss calculation method is preferably the reference path loss calculation method (a) or the reference path loss calculation method (b).
  • the second embodiment includes a reference path loss calculation method in which the amount of interference in a base station of a non-cooperative cell is made constant as a candidate for the reference path loss calculation method.
  • the main structures of the terminal and base station of Example 2 are the same as that of Example 1, it demonstrates using FIG.6 and FIG.7.
  • any of the above-described relative relationship and the amount of interference itself in the non-cooperative cell can be used as a reference for switching the reference path loss calculation method. In the following description, a case where the amount of interference in a non-cooperative cell is used will be described as an example.
  • the transmission power control unit 68 switches the reference path loss calculation method based on the amount of interference in the non-cooperative cell regarding the signal transmitted by the own device.
  • a reference path loss calculation method (e) in which the amount of interference (that is, the amount of interference) in a base station of a non-cooperative cell is made constant is included as a candidate for the reference path loss calculation method.
  • the target value of the amount of interference is set in the terminal 20 in advance, or is set from the base station to the terminal 20 by an upper layer signal.
  • the threshold values used for switching the reference path loss calculation method are the interference amount and the target value of the interference amount when the reference path loss calculation methods (a), (b), (c), and (d) are applied, respectively.
  • the matching path loss values PLadjacent may be set to threshold values Th (a), Th (b), Th (c), and Th (d), respectively.
  • the path loss values calculated by the reference path loss calculation methods (a), (b), (c), and (d) are PL (a), PL (b), PL (c), and PL (d).
  • the threshold values Th (a), Th (b), Th (c), and Th (d) are expressed by the following equations.
  • FIG. 13 is a flowchart illustrating an example of transmission power control in the terminal 20 according to the second embodiment.
  • the transmission power control unit 68 calculates PL adjacent , which is the RP path loss value of the non-cooperative cell (step S31).
  • the transmission power control unit 68 compares the calculated PLadient value with each of the threshold values Th (b) and Th (d) (steps S32 and S33).
  • the relationship of the threshold values satisfies Th (d) ⁇ Th (b).
  • the transmission power control unit 68 selects the reference path loss calculation method (b) when the value of PLadjacent is larger than the threshold Th (b), that is, when the distance from the non-cooperative cell is relatively far (step S34). ).
  • the transmission power control unit 68 determines the reference path loss calculation method (e ) Is selected (step S35).
  • the transmission power control unit 68 selects the reference path loss calculation method (d) (step S36). .
  • the transmission power control unit 68 calculates transmission power using the reference path loss value calculated by the selected reference path loss calculation method (step S37).
  • FIG. 14 is a diagram for explaining an example of a switching pattern of the reference path loss calculation method according to the second embodiment.
  • the reference path loss calculation methods (b), (e), and (d) are sequentially switched.
  • the reference path loss calculation method (d) when the value of PLadjacent is small, that is, when the position of the terminal 20 is close to the non-cooperative cell, the reference path loss calculation method (d) is selected.
  • the reference path loss calculation method (d) is switched to the reference path loss calculation method (e) at the threshold Th (d).
  • the reference path loss calculation method (e) is switched to the reference path loss calculation method (b) at the threshold Th (b).
  • the reference path loss calculation method (b) when the position of the terminal 20 is away from the non-cooperative cell and the path loss value is large, the reference path loss calculation method (b) is applied, and the reception characteristics of the terminal 20 to which JR is applied can be improved. Further, when the path loss value becomes medium, the reference path loss calculation method (e) is applied, and the amount of interference can be held at the target value. In addition, when the path loss value is small, the reference path loss calculation method (d) is applied, and it is possible to avoid the reception characteristics of the terminal 20 to which JR is applied from being significantly deteriorated.
  • FIG. 15 is a diagram for explaining another example of the switching pattern of the reference path loss calculation method according to the second embodiment.
  • the reference path loss calculation methods (c) and (e) are switched in this order as the position of the terminal 20 approaches the base station of the non-cooperative cell.
  • This switching pattern is based on the idea that importance is placed on suppressing the amount of interference with neighboring cells.
  • the reference path loss calculation method (e) is selected.
  • the reference path loss calculation method is changed from the reference path loss calculation method (e) to the reference path loss calculation method (c) with a threshold Th (c).
  • Th a threshold
  • the reference path loss calculation method (c) is applied, while maintaining the reception characteristics of the terminal 20 to which JR is applied, The amount of interference is reduced as much as possible.
  • the reference path loss calculation method (e) is applied, and it is possible to avoid an increase in the amount of interference to the non-cooperative cell at the expense of the reception characteristics of the terminal 20 to which JR is applied. .
  • one of a plurality of switching patterns including those exemplified may be set in advance for the terminal 20, or may be set by a higher layer signal. Moreover, it may be switched among a plurality of switching patterns depending on the situation.
  • a plurality of reference path loss value calculation method candidates selected by the transmission power control unit 68 include a reference path loss calculation method in which the amount of interference with a base station in a non-cooperative cell is constant. (E) is included.
  • the terminals and base stations in the first and second embodiments can be realized by the following hardware configuration.
  • FIG. 16 is a diagram illustrating a hardware configuration of the terminal.
  • the terminal 20 includes a CPU (Central Processing Unit) 20a, a memory 20b, an RF circuit 20c having an antenna, and a display device 20d such as an LCD (Liquid Crystal Display).
  • the memory 20b is composed of, for example, a RAM such as an SDRAM, a ROM, and a flash memory.
  • the wireless unit 21 is realized by the RF circuit 20c.
  • the control unit 22 is realized by an integrated circuit such as the CPU 20a.
  • FIG. 17 is a diagram illustrating a hardware configuration of the base station.
  • the base station 30 includes, as hardware components, a DSP (Digital Signal Processor) 30a, an FPGA (Field Programmable Gate Array) 30b, a memory 30c, and an RF (Radio Frequency) circuit 30d. And a network IF (Inter Face) 30e.
  • the DSP 30a and the FPGA 30b are connected so that various signals and data can be input / output via a network IF 30e such as a switch.
  • the RF circuit 30d has an antenna.
  • the memory 30c includes, for example, a RAM such as a SDRAM (Synchronous Dynamic Random Access Memory), a ROM (Read Only Memory), and a flash memory.
  • the control unit 32 is realized by an integrated circuit such as a DSP 30a or FPGA 30b.
  • the wireless unit 31 is realized by the RF circuit 30d.
  • the various processes described in the first and second embodiments can be realized by executing a program prepared in advance on a computer. That is, a program corresponding to each process executed by the control unit 22 may be recorded in the memory 20b, and each program may be read by the CPU 20a to function as a process. Also, a program corresponding to each process executed by the control unit 32 may be recorded in the memory 30c, and each program may be read out to the DSP 30a and the FPGA 30b to function as a process.
  • the terminal 20 and the base stations 30, 40, and 50 are described as examples.
  • the present invention is not limited to this, and the embodiment described above also applies to a transmission device, a plurality of reception devices that cooperatively receive signals transmitted from the transmission device, and other reception devices that do not participate in the cooperative reception. Holds.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

Selon l'invention, dans un terminal (20), une unité de mesure de RSRP (67) calcule la puissance reçue d'un signal de référence émis par une station de base (50) qui ne réalise pas une réception coopérative. Un dispositif de commande de puissance d'émission (68) sélectionne un procédé de calcul d'affaiblissement de propagation (PL) de référence parmi une pluralité de procédés de calcul candidats sur la base de la relation relative entre la qualité de réception soit dans une station de base (30) réalisant une réception coopérative, soit dans une station de base (40), et la quantité de brouillage dans la station de base de cellule non coopérative (50). Le dispositif de commande de puissance d'émission (68) utilise le procédé de calcul d'affaiblissement de propagation de référence sélectionné pour calculer une valeur d'affaiblissement de propagation de référence, et utilise la valeur d'affaiblissement de propagation de référence calculée pour calculer une valeur de puissance d'émission.
PCT/JP2012/055147 2012-02-29 2012-02-29 Dispositif d'émission, dispositif de réception, procédé de commande de puissance d'émission et programme WO2013128605A1 (fr)

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