WO2017104088A1 - Station de base, procédé de commande de station de base et système de communication sans fil - Google Patents

Station de base, procédé de commande de station de base et système de communication sans fil Download PDF

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Publication number
WO2017104088A1
WO2017104088A1 PCT/JP2015/085591 JP2015085591W WO2017104088A1 WO 2017104088 A1 WO2017104088 A1 WO 2017104088A1 JP 2015085591 W JP2015085591 W JP 2015085591W WO 2017104088 A1 WO2017104088 A1 WO 2017104088A1
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Prior art keywords
terminal
subframe
transmission power
change
unit
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PCT/JP2015/085591
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English (en)
Japanese (ja)
Inventor
裕明 渡辺
義博 河▲崎▼
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富士通株式会社
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Priority to JP2017556310A priority Critical patent/JP6673365B2/ja
Priority to PCT/JP2015/085591 priority patent/WO2017104088A1/fr
Publication of WO2017104088A1 publication Critical patent/WO2017104088A1/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
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to a base station, a base station control method, and a radio communication system.
  • a TDD Time Division Duplex which has a base station and a terminal, and the base station performs communication by switching between an uplink section for receiving an uplink signal and a downlink section for transmitting a downlink signal in a time division manner with the terminal.
  • Type wireless communication system is known.
  • the base station instructs each terminal of a UL (Up Link) / DL (Down Link) configuration for switching an uplink section and a downlink section in a time division manner for each subframe.
  • the base station instructs each terminal in the cell to have the same UL / DL configuration.
  • the traffic volume in the downlink is larger than the traffic volume in the uplink except for voice communication. Therefore, in the UL / DL configuration instructed from the base station to each terminal, the number of downlink subframes is often set to be larger than the number of uplink subframes.
  • the base station may transmit a downlink signal to a certain terminal and receive an uplink signal transmitted from another terminal at the same frequency. is there.
  • the downlink signal transmitted to the terminal wraps around the receiving unit at a high level via the antenna. For this reason, when receiving an uplink signal having the same frequency while transmitting a downlink signal, the quality of the uplink signal received from the terminal deteriorates due to the downlink signal that wraps around the reception unit in the base station.
  • a base station provided with a self-interference canceller that suppresses quality degradation of the uplink signal from the terminal by canceling the downlink signal from the signal received via the antenna.
  • a base station cell includes a terminal that transmits an uplink signal and a terminal that receives a downlink signal for each subframe.
  • the transmission of the uplink signal and the reception of the downlink signal are performed in the same subframe using the same frequency, the signal from the terminal that transmits the uplink signal is transmitted to the terminal that receives the downlink signal. Interference signal. Therefore, when a terminal in the vicinity of a terminal that receives a downlink signal transmits an uplink signal, the reception quality of the downlink signal may deteriorate, and the throughput of downlink data may decrease.
  • the disclosed technology has been made in view of the above, and an object thereof is to suppress a decrease in throughput in a downlink section when a different UL / DL configuration is assigned to each terminal.
  • a base station that performs communication by switching between an uplink section that receives an uplink signal and a downlink section that transmits a downlink signal in a time-sharing manner with each terminal includes a specifying unit, an instruction unit, And a calculation unit.
  • the identifying unit identifies the first subframe when the switching pattern for switching between the uplink and the downlink in time division is changed for each subframe for any of the terminals.
  • the first subframe is a subframe that is set to the downlink section in the switching pattern before the change and is changed to the uplink section in the switch pattern after the change.
  • the instructing unit instructs an initial value of transmission power in the first subframe to a first terminal that is a terminal whose switching pattern has been changed.
  • the calculation unit receives the downlink signal reception quality in the first subframe before the change of the switching pattern and the first subframe after the change of the switching pattern.
  • the amount of change between the reception quality of the downlink signal is calculated.
  • the instructing unit controls the transmission power instructed to the first terminal based on the amount of change after the first terminal transmits with the initial transmission power in the first subframe.
  • FIG. 1 is a diagram illustrating an example of a wireless communication system.
  • FIG. 2 is a block diagram illustrating an example of an eNB.
  • FIG. 3 is a diagram for explaining the influence of switching between UL / DL configurations.
  • FIG. 4 is a diagram illustrating an example of control of transmission power of the first UE.
  • FIG. 5 is a diagram illustrating an example of control of transmission power of the first UE.
  • FIG. 6 is a diagram illustrating an example of control of transmission power of the first UE.
  • FIG. 7 is a block diagram illustrating an example of a UE.
  • FIG. 8 is a flowchart illustrating an example of the operation of the eNB.
  • FIG. 9 is a flowchart illustrating an example of the operation of the eNB.
  • FIG. 8 is a flowchart illustrating an example of the operation of the eNB.
  • FIG. 10 is a sequence diagram illustrating an example of the operation of the wireless communication system.
  • FIG. 11 is a diagram illustrating an example of hardware of a communication device that implements an eNB.
  • FIG. 12 is a diagram illustrating an example of hardware of a communication device that implements a UE.
  • FIG. 1 is a diagram illustrating an example of a wireless communication system 10.
  • the radio communication system 10 includes an eNB (evolved Node B) 20 and a plurality of UEs (User Equipment) 30-1 to 30-n (n is an integer of 2 or more).
  • the eNB 20 performs radio communication with each of the plurality of UEs 30-1 to 30-n in the cell 11 by, for example, the TDD scheme.
  • a plurality of UEs 30-1 to 30-n are collectively referred to as UE 30 without being distinguished from each other.
  • one eNB 20 is provided in the radio communication system 10, but a plurality of eNBs 20 may be provided in the radio communication system 10.
  • the eNB 20 is an example of a base station.
  • Each UE 30 is an example of a terminal.
  • ENB20 changes UL / DL structure at any time based on the data amount of the uplink signal transmitted from UE30 to eNB20 and the data amount of the downlink signal transmitted from eNB20 to UE30 for every UE30.
  • the UL / DL configuration is information that defines a combination pattern of an uplink subframe and a downlink subframe in one frame.
  • the UL / DL configuration is an example of a switching pattern and an array pattern.
  • Each UE 30 transmits data to the eNB 20 in the uplink subframe and receives data from the eNB 20 in the downlink subframe according to the UL / DL configuration instructed from the eNB 20.
  • FIG. 2 is a block diagram illustrating an example of the eNB 20.
  • the eNB 20 includes, for example, a reception unit 21, a control unit 22, a transmission unit 23, and an antenna 24 as illustrated in FIG.
  • the antenna 24 receives the uplink signal transmitted from the UE 30 and outputs it to the reception unit 21. Moreover, the antenna 24 transmits the downlink signal output from the transmission unit 23 to the UE 30.
  • the receiving unit 21 includes a quality information extracting unit 210, a control information extracting unit 211, a demodulation / decoding unit 212, a self-interference removing unit 213, and a wireless receiving unit 214.
  • the control unit 22 includes an offset calculation unit 220, a system information management unit 221, and a wireless line control unit 222.
  • the transmission unit 23 includes a control signal generation unit 230, a pilot generation unit 231, a radio channel control information generation unit 232, an encoding / modulation unit 233, a multiple access processing unit 234, a delay unit 235, and a radio transmission unit 236.
  • Radio receiving section 214 performs processing such as down-conversion on the uplink signal output from antenna 24, and outputs the processed uplink signal to self-interference removal section 213.
  • the self-interference removal unit 213 cancels the downlink signal output from the transmission unit 23 from the uplink signal output from the wireless reception unit 214. Thereby, eNB20 can suppress the quality degradation of the uplink signal received from UE30, even if it is a case where reception of an uplink signal and transmission of a downlink signal are performed simultaneously on the same frequency.
  • the self-interference removing unit 213 outputs the uplink signal from which the downlink signal is canceled to the demodulation / decoding unit 212.
  • the demodulator / decoder 212 demodulates the uplink signal output from the self-interference canceler 213. Then, the demodulation / decoding unit 212 decodes received data from the demodulated uplink signal. Then, the demodulator / decoder 212 outputs the decoded received data to the core network. The reception data decoded by the demodulation / decoding unit 212 is also output to the quality information extraction unit 210 and the control information extraction unit 211.
  • the control information extraction unit 211 extracts control information from the reception data output from the demodulation / decoding unit 212. Then, the control information extraction unit 211 outputs the extracted control information to the system information management unit 221. Further, when the extracted control information includes a BSR (Buffer Status Report), the control information extraction unit 211 outputs the BSR to the radio channel control unit 222 together with the information of the UE 30 that is the transmission source of the BSR.
  • BSR Buffer Status Report
  • the quality information extraction unit 210 determines whether or not the reception data output from the demodulation / decoding unit 212 includes quality information indicating whether the downlink data has been successfully received or received.
  • the quality information includes ACK (ACKnowledgement) indicating successful reception of data in the downlink section or NACK (Negative ACK) indicating reception failure.
  • the quality information extraction unit 210 includes the information on the UE 30 that is the transmission source of the quality information and the data that is the target of the quality information.
  • the downstream subframe identification information is output to offset calculation section 220.
  • the system information management unit 221 manages system information for each UE 30 based on the control information output from the quality information extraction unit 210. For example, the system information management unit 221 manages the identification information of the UE 30 in an active state in the cell 11. The UE 30 in the active state is, for example, the UE 30 in RRC (Radio Resource Control) connected mode. In addition, the system information management unit 221 outputs information used to create a pilot signal to the transmission unit 23.
  • RRC Radio Resource Control
  • the radio network controller 222 manages the amount of downlink signal data transmitted from the core network side to the UE 30 for each UE 30. Then, the radio network controller 222 determines the UL / DL configuration for each UE 30 based on the data amount of the downlink signal and the BSR output from the quality information extraction unit 210. Further, the radio channel controller 222 determines the reference transmission power P def in the uplink section of the UL / DL configuration based on the physical resources allocated to the UE 30, the propagation loss between the eNB 20 and the UE 30, and the like.
  • the radio channel control unit 222 outputs the determined UL / DL configuration and reference transmission power P def information to the radio channel control information creation unit 232 together with the identification information of the UE 30 that is the allocation target of the UL / DL configuration. .
  • the radio network controller 222 changes the UL / DL configuration of another UE 30 in the cell 11 for a predetermined period when the UL / DL configuration of any UE 30 in the cell 11 is changed. Do not do.
  • the predetermined period is a period in which, for example, the UE 30 whose UL / DL configuration has been changed is controlling the transmission power offset A in the uplink section.
  • the radio network controller 222 determines whether or not there is a first subframe in the changed UL / DL configuration.
  • the first subframe is a subframe that is designated as the downlink section in the UL / DL configuration before the change and is designated as the uplink section in the UL / DL configuration after the change.
  • the subframe specified for the uplink section is an example of an uplink section subframe
  • the first subframe is an example of a specific uplink section subframe.
  • UE30 by which UL / DL structure was changed is called 1st UE30.
  • the first UE 30 is an example of a first terminal.
  • the radio network controller 222 determines that another UE 30 to which the UL / DL configuration in which the first subframe is a downlink section is assigned is the cell 11 is present or not.
  • another UE 30 to which the UL / DL configuration in which the first subframe is a downlink section is assigned is referred to as a second UE 30.
  • the second UE 30 is an example of a second terminal.
  • the radio network controller 222 When the second UE 30 is present in the cell 11, the radio network controller 222, the first subframe information, the first UE 30 identification information, the second UE 30 identification information, Information on the reference transmission power P def of UE 30 is output to offset calculation section 220. In addition, when the instruction to restore the UL / DL configuration is output from the offset calculation unit 220, the radio network controller 222 changes the UL / DL configuration of the first UE 30 to the UL / DL configuration before the change. return.
  • the wireless line control unit 222 is an example of a control unit and a specifying unit.
  • FIG. 3 is a diagram for explaining the influence of switching between UL / DL configurations.
  • 3A to 3C show the UL / DL configuration for one frame.
  • One frame includes 10 subframes # 0 to # 9.
  • 3A to 3C “D” indicates a subframe in a downstream section, “U” indicates a subframe in an upstream section, and “S” indicates a special subframe.
  • the UL / DL configuration of the first UE 30 is, for example, the UL / DL configuration illustrated in FIG. 3C
  • the UL / DL configuration of the first UE 30 is, for example, the UL / DL configuration illustrated in FIG.
  • the allocation of subframes # 6 to 9 is different.
  • the subframes # 7 to # 9 are changed from the downlink section to the uplink section.
  • the subframes # 7 to # 9 are the first subframe.
  • the subframe set in the downlink section in the UL / DL configuration of the second UE 30 is, for example, the subframe # 9 as shown in FIG.
  • the first UE 30 transmits an uplink signal to the eNB 20 in the first subframes # 7 to # 9.
  • the second UE 30 receives the downlink signal from the eNB 20 in the subframe # 9 in the first subframe # 7 to # 9. Therefore, when the UL / DL configuration is changed, the uplink signal transmitted from the first UE 30 in the subframe # 9 may newly give interference to the second UE 30.
  • the second UE 30 may fail to receive the downlink signal due to the uplink signal transmitted from the first UE 30. Thereby, the throughput of the downlink section in the 2nd UE30 may fall.
  • the eNB 20 of this embodiment controls the transmission power of the first UE 30 in the first subframe so that the transmission power is lower than the reference transmission power P def by an offset A. That is, in the changed UL / DL configuration, the transmission power applied to the signal transmitted in the first subframe and the subframe specified in the uplink section other than the first subframe are transmitted. An offset is set between the transmission power applied to the signal. Thereby, the reception failure of the downlink signal by the second UE 30 can be suppressed, and a decrease in the throughput of the downlink section can be suppressed.
  • the eNB 20 may notify the first UE 30 of information specifically indicating which subframe the offset A is applied to. .
  • an offset A application target is determined using a bitmap of length m. Can be shown.
  • the eNB 20 may transmit this bitmap to the first UE 30 together with information indicating the change contents of the UL / DL configuration.
  • eNB20 may notify the value of offset A to UE30 by including the value of offset A in the control signal used in order to give permission of signal transmission with respect to UE30.
  • eNB20 of a present Example monitors the NACK incidence rate of 2nd UE30 about the downlink signal of a 1st sub-frame, and transmission power of 1st UE30 in a 1st sub-frame based on this NACK occurrence rate To control. Specifically, the eNB 20 changes the NACK occurrence rate of the second UE 30 after the UL / DL configuration is changed with reference to the NACK occurrence rate of the second UE 30 before the UL / DL configuration is changed. The transmission power of the first UE 30 is controlled so that the amount is less than a predetermined value. Thereby, eNB20 can suppress the fall of the throughput of 2nd UE30 in a downlink area.
  • eNB20 controls the transmission power of 1st UE30 so that the transmission power of 1st UE30 may become large in the range from which the variation
  • the throughput of the up section in 1st UE30 can be improved.
  • the first UE 30 transmits an uplink signal with the reference transmission power P def for the subframes in the uplink section other than the first subframe.
  • the offset calculation unit 220 when information such as the first subframe is output from the radio channel control unit 222, the initial value A 0 of the offset A of the transmission power output by the first UE 30 in the first subframe. Is calculated.
  • the offset calculation unit 220 calculates the initial value of the transmission power P of the first UE 30 in the first subframe based on the area of the cell 11 of the eNB 20 and the number of UEs 30 in the cell 11. For example, the offset calculation unit 220 determines whether the UEs 30 in the active state are evenly distributed in the cell 11 based on the number of UEs 30 in the cell 11 and the area of the cell 11. Calculate the average distance. Then, the offset calculation unit 220 assumes that the first UE 30 and the second UE 30 are adjacent to each other at the calculated average distance, and the upstream of the first UE 30 is within a range in which the NACK occurrence rate of the second UE 30 does not deteriorate. The maximum value P max of the signal transmission power is calculated.
  • the maximum value P max is an example of the initial value of the transmission power P of the first UE 30 in the first subframe. Then, the offset calculation unit 220 calculates the difference between the reference transmission power P def calculated by the radio channel control unit 222 and the aforementioned maximum value P max as the initial value A 0 of the offset A. Then, the offset calculation unit 220 outputs the calculated initial value A 0 of the offset A to the transmission unit 23 together with the information of the first subframe and the identification information of the first UE 30.
  • the maximum value P max is, if the reference is greater than the transmission power P def equal to or reference transmission power P def, the initial value A 0 is 0 offset A.
  • the initial value A 0 of the offset A may be notified to the first UE 30 together with the UL / DL configuration information when the UL / DL configuration is changed.
  • the offset calculation unit 220 calculates the NACK occurrence rate for each subframe for each UE 30 based on the quality information output from the control information extraction unit 211.
  • the NACK occurrence rate is an example of reception quality.
  • the offset calculation unit 220 calculates the difference between the NACK occurrence rate R 1 of the second UE 30 and the NACK occurrence rate R 2 of the second UE 30. Calculated as a change amount ⁇ R.
  • the NACK occurrence rate R 1 is the NACK occurrence rate of the first subframe before the UL / DL configuration change
  • the NACK occurrence rate R 2 is the NACK occurrence of the first subframe after the UL / DL configuration change. is the rate R 2.
  • the offset calculator 220 calculates a value obtained by subtracting the NACK occurrence rate R 1 from the NACK occurrence rate R 2 as the change amount ⁇ R.
  • the offset calculation unit 220 after the UL / DL configuration is changed, for example, every several frames, calculates the NACK occurrence rate R 2 of the first sub-frame after the change of the UL / DL configurations. Then, the offset calculation unit 220 updates the change amount ⁇ R using the calculated NACK occurrence rate R 2 and the NACK occurrence rate R 1 .
  • the offset calculation unit 220 changes the offset A to a predetermined change
  • the transmission power P of the first UE 30 when the amount is increased by the amount ⁇ A 1 is calculated. If the offset A is increased change amount .DELTA.A 1 minute, the transmission power P of the first UE30 is decreased change amount .DELTA.A 1 minute.
  • the change amount ⁇ A 1 of the offset A is an example of an instruction to reduce the transmission power by the first power.
  • the offset calculating unit 220 When the calculated transmission power P is greater than the predetermined lower limit value P th , the offset calculating unit 220 outputs the calculated change amount ⁇ A 1 of the offset A to the control signal generating unit 230 together with the identification information of the first UE 30. To do.
  • the calculated change amount ⁇ A 1 of the offset A is transmitted to the first UE 30. Thereby, the transmission power of the first UE 30 in the first subframe is decreased by the change amount ⁇ A 1 , and the NACK occurrence rate of the second UE 30 in the first subframe is improved.
  • the lower limit value P th is an example of a third threshold value.
  • the offset calculation unit 220 outputs an instruction to restore the UL / DL configuration to the radio line control unit 222. And the offset calculation part 220 complete
  • the offset calculation unit 220 changes the offset A to the predetermined change amount ⁇ A 2.
  • the transmission power P of the first UE 30 when it is decreased by a certain amount is calculated. If the offset A is decreased change amount .DELTA.A 2 minutes, the transmission power P of the first UE30 increases change amount .DELTA.A 2 minutes. Note that the second threshold value R th2 is lower than the first threshold value R th1 .
  • the offset calculation unit 220 sets the difference between the current transmission power P of the first UE 30 and the reference transmission power P def as the change amount ⁇ A 2 ′. calculate. Then, the calculated change amount ⁇ A 2 ′ of the offset A is output to the control signal creation unit 230 together with the identification information of the first UE 30, and the process of controlling the offset A of the first UE 30 is ended. The calculated change amount ⁇ A 2 ′ of offset A is transmitted to the first UE 30. Thus, the transmission power of the first UE30 in the first sub-frame is increased to the reference transmission power P def.
  • the offset calculation unit 220 outputs the calculated change amount ⁇ A 2 of the offset A to the transmission unit 23 together with the identification information of the first UE 30. .
  • the calculated change amount ⁇ A 2 of the offset A is transmitted to the first UE 30.
  • the change amount ⁇ A 2 and the change amount ⁇ A 2 ′ of the offset A are an example of an instruction for increasing the transmission power by the second power.
  • the absolute value of the change amount ⁇ A 1 and the absolute value of the change amount ⁇ A 2 may be the same size or different sizes.
  • the offset calculation unit 220 does not change the offset A of the first UE 30.
  • the fact that the offset change amount is 0 may be indicated in the control signal transmitted to the first UE 30.
  • the predetermined time is, for example, a time for several frames. The value of the predetermined time may be notified to the first UE 30 together with the UL / DL configuration information when the UL / DL configuration is changed.
  • this predetermined time may be alert
  • the offset calculation unit 220 calculates the change amount ⁇ R for each second UE 30 and, for example, the largest value among the calculated change amounts ⁇ R. Is determined. Then, using the specified change amount ⁇ R, the offset calculation unit 220 determines whether the change amount ⁇ R is greater than or equal to the first threshold value R th1 and whether the change amount ⁇ R is greater than or equal to the second threshold value R th2. judge.
  • the offset calculation unit 220 is an example of an instruction unit and a calculation unit.
  • the control signal generator 230 outputs the first subframe output from the offset calculator 220, the initial value A 0 of the offset A, the change amount ⁇ A 1 , the change amount ⁇ A 2 , the change amount ⁇ A 2 ′, and the effective period of the offset value.
  • a control signal including one or a plurality of pieces of information such as the first UE 30 is created.
  • the control signal creation unit 230 outputs the created control signal to the encoding / modulation unit 233.
  • the pilot creation unit 231 creates a pilot signal based on the information output from the system information management unit 221, and outputs the created pilot signal to the encoding / modulation unit 233.
  • the radio channel control information creation unit 232 includes, together with the identification information of the UE 30, one or more of the UL / DL configuration, information indicating a subframe to which the transmission power offset is applied, information on the reference transmission power P def , and the like.
  • radio channel control information including these pieces of information and destined for the UE 30 is created.
  • Radio channel control information creation section 232 then outputs the created radio channel control information to encoding / modulation section 233.
  • the encoding / modulation unit 233 outputs the transmission data output from the core network, the control signal output from the control signal generation unit 230, the pilot signal output from the pilot generation unit 231 and the radio channel control information generation unit 232 The obtained radio channel control information is encoded.
  • the control signal output from control signal generator 230 and the radio channel control information output from radio channel control information generator 232 may be transmitted independently of each other at the same time or independently of each other at different times. It doesn't matter.
  • the encoding / modulation unit 233 modulates the encoded downlink signal and outputs the modulated downlink signal to the multiple access processing unit 234.
  • the multiple access processing unit 234 maps the downlink signal to each UE 30 to a physical resource. Then, the multiple access processing unit 234 outputs the mapped downlink signal to the delay unit 235 and the wireless transmission unit 236.
  • the delay unit 235 delays the downlink signal output from the multiple access processing unit 234 by a predetermined time and outputs the delayed signal to the self-interference removal unit 213.
  • the radio transmission unit 236 performs processing such as up-conversion on the downlink signal output from the multiple access processing unit 234, and transmits the processed downlink signal via the antenna 24.
  • FIG. 4 shows the offset A and the transmission power P of the first UE 30 when the fluctuation amount ⁇ R of the NACK occurrence rate of the second UE 30 is equal to or greater than the first threshold R th1 due to the change in the UL / DL configuration.
  • FIG. 4B shows a change in the transmission power P of the first UE 30 in the first subframe.
  • the offset calculation unit 220 at time t 0, for example, as shown in FIG. 4 (a), to calculate the initial value A 0 of the offset A.
  • Information on the initial value A 0 of the offset A is notified to the first UE 30.
  • the first UE 30 starts transmission of the uplink signal at time t 0 with power P 0 that is lower than the reference transmission power P def by the initial value A 0 , for example, as shown in FIG. 4B.
  • the offset calculation unit 220 sets the offset A as shown in FIG. Increase from the initial value A 0 by the change amount ⁇ A 1 .
  • the first UE 30 decreases the transmission power P of the uplink signal by the change amount ⁇ A 1 from the power P 0 at time t 1 , for example, as illustrated in FIG. 4B.
  • the offset calculation unit 220 increases the offset A by the change amount ⁇ A 1 , and the first UE 30 The transmission power P decreases by the change amount ⁇ A 1 .
  • the offset calculation unit 220 restores the UL / DL configuration to the original at time t 2 when the transmission power P of the first UE 30 is equal to or lower than the lower limit value P th. An instruction to that effect is output to the radio network controller 222. Thereby, the UL / DL configuration of the first UE 30 is restored. And the offset calculation part 220 complete
  • FIG. 5B shows a change in the transmission power P of the first UE 30 in the first subframe.
  • the offset calculation unit 220 at time t 0, for example, as shown in FIG. 5 (a), to calculate the initial value A 0 of the offset A, first UE30 at time t 0, for example, FIG. 5 ( As shown in b), uplink signal transmission is started at power P 0 .
  • the offset calculation unit 220 sets the offset A as shown in FIG. Decrease the change amount ⁇ A 2 from the initial value A 0 .
  • the first UE 30 increases the transmission power P of the uplink signal by the change amount ⁇ A 2 from the power P 0 at time t 1 , for example, as illustrated in FIG. 5B.
  • the offset calculation unit 220 decreases the offset A by the change amount ⁇ A 2 , and the first UE 30 Transmission power P increases by a change amount ⁇ A 2 .
  • the offset calculation unit 220 calculates the current offset A value. It is calculated as the change amount ⁇ A 2 ′ of the offset A.
  • the change amount ⁇ A 2 ′ corresponds to the difference between the current transmission power P ′ and the reference transmission power P def .
  • Information on the change amount ⁇ A 2 ′ is notified to the first UE 30.
  • the first UE30 at time t 2, the example as shown in FIG. 5 (b), the transmission power P of the uplink signal is increased change amount .DELTA.A 2 'min.
  • the transmission power P of the first UE 30 becomes the reference transmission power P def .
  • the offset calculation part 220 complete
  • the first UE30 is a reference transmission power P def, transmits an uplink signal in the first subframe.
  • P changes, for example, as shown in FIG. FIG. 6B shows a change in the transmission power P of the first UE 30 in the first subframe.
  • the offset calculation unit 220 at time t 0, for example, as shown in FIG. 6 (a), to calculate the initial value A 0 of the offset A, first UE30 at time t 0, for example, FIG. 6 ( As shown in b), uplink signal transmission is started at power P 0 .
  • the offset calculation unit 220 increases the offset A by the change amount ⁇ A 1 or changes the change amount ⁇ A 2 minutes, for example, as shown in FIG. Decrease. Accordingly, the first UE 30 decreases the transmission power P of the uplink signal by the change amount ⁇ A 1 or increases the change amount ⁇ A 2 as shown in FIG. 6B, for example. Then, at the time t 1 when the period during which the offset A is not changed continues for the predetermined time ⁇ T or more, the offset calculation unit 220 ends the process of controlling the offset A of the first UE 30. Thereafter, the first UE 30 transmits the uplink signal in the first subframe with the transmission power P at time t 1 .
  • FIG. 7 is a block diagram illustrating an example of the UE 30.
  • the UE 30 includes a reception unit 31, a control unit 32, a transmission unit 33, and an antenna 34.
  • the antenna 34 receives the downlink signal transmitted from the eNB 20 and outputs it to the reception unit 31. Further, the antenna 34 transmits the uplink signal output from the transmission unit 33 to the eNB 20.
  • the reception unit 31 includes a radio reception unit 310, a demodulation / decoding unit 311, a system information extraction unit 312, a control signal extraction unit 313, a pilot extraction unit 314, and a channel quality measurement unit 315.
  • the control unit 32 includes a terminal information control unit 320, a system information management unit 321, and a wireless line control unit 322.
  • the transmission unit 33 includes a radio transmission unit 330, an encoding / modulation unit 331, a pilot creation unit 332, a control signal creation unit 333, and a radio channel control information creation unit 334.
  • the wireless reception unit 310 performs a reception operation in accordance with control from the wireless line control unit 322.
  • Radio receiving section 310 performs processing such as down-conversion on the downlink signal output from antenna 34 in the receiving operation, and outputs the processed downlink signal to demodulation / decoding section 311.
  • the demodulation / decoding unit 311 demodulates the downlink signal output from the wireless reception unit 310. Then, the demodulation / decoding unit 311 decodes received data from the demodulated downlink signal. Then, the demodulation / decoding unit 311 outputs the decoded received data to an application processing unit (not shown) that performs processing based on the received data.
  • the reception data decoded by the demodulation / decoding unit 311 is also output to the system information extraction unit 312, the control signal extraction unit 313, and the pilot extraction unit 314.
  • the system information extraction unit 312 extracts system information from the reception data output from the demodulation / decoding unit 311. Then, the system information extraction unit 312 outputs the extracted system information to the system information management unit 321.
  • the control signal extraction unit 313 extracts radio channel control information and control signals from the received data output from the demodulation / decoding unit 311. Then, the control signal extraction unit 313 extracts information on the UL / DL configuration and the reference transmission power P def from the extracted radio channel control information and outputs the information to the radio channel control unit 322. Further, the control signal extraction unit 313 extracts the first subframe, the initial value A 0 of the offset A, the change amount ⁇ A 1 , the change amount ⁇ A 2 , and the change amount ⁇ A 2 ′ from the extracted control signal. The data is output to the wireless line control unit 322. Further, the control signal extraction unit 313 outputs information indicating whether the demodulation / decoding unit 311 has successfully decoded received data to the line quality measurement unit 315.
  • Pilot extraction section 314 extracts a pilot signal from the reception data output from demodulation / decoding section 311. Then, pilot extraction section 314 outputs the extracted pilot signal to channel quality measurement section 315.
  • the channel quality measurement unit 315 measures the quality of the radio channel based on the pilot signal output from the pilot extraction unit 314. Also, the channel quality measurement unit 315 acquires information indicating whether or not the received data has been successfully decoded from the control signal extraction unit 313, and creates ACK or NACK information for each subframe in the downlink section. Then, channel quality measuring section 315 outputs ACK or NACK information generated for each subframe to radio channel control information creating section 334.
  • the terminal information control unit 320 monitors the data amount in the transmission buffer of the UE 30 and creates a BSR indicating the data amount in the transmission buffer. Terminal information control unit 320 then outputs the created BSR to radio channel control unit 322.
  • the system information management unit 321 manages the system information output from the system information extraction unit 312. Then, system information management section 321 outputs information used for generating a pilot signal to pilot creation section 332.
  • the radio line control unit 322 When the BSR is output from the terminal information control unit 320, the radio line control unit 322 outputs the BSR information to the control signal creation unit 333. Further, based on the UL / DL configuration output from the control signal extraction unit 313, the radio line control unit 322 instructs the radio reception unit 310 to perform a reception operation in the subframe in the downlink section, and performs radio communication in the subframe in the uplink section. A transmission operation is instructed to the transmission unit 330.
  • the radio channel control unit 322 outputs the reference transmission power P def. Then, the power obtained by subtracting the initial value A 0 is calculated as the initial value P 0 of the transmission power P. Then, the wireless channel control unit 322 controls the wireless transmission unit 330 to transmit the uplink signal in the first subframe with the calculated initial value P 0 of the transmission power P.
  • the radio line control unit 322 decreases the transmission power P in the first subframe from the current transmission power P by the change amount ⁇ A 1.
  • the radio line control unit 322 changes the transmission power P in the first subframe from the current transmission power to the change amount ⁇ A.
  • the wireless transmission unit 330 is controlled to increase by 2 or the change amount ⁇ A 2 ′.
  • the wireless line control unit 322 changes the change amount ⁇ A 1 , ⁇ A 2 , or ⁇ A. The control of the transmission power P in the first subframe based on 2 ′ is terminated.
  • the radio channel control information creation unit 334 creates radio channel control information including ACK or NACK information output from the channel quality measurement unit 315. Radio channel control information creation section 334 then outputs the created radio channel control information to encoding / modulation section 331.
  • the control signal creation unit 333 creates a control signal including the BSR output from the wireless line control unit 322. Then, the control signal creation unit 333 outputs the created control signal to the encoding / modulation unit 331.
  • the pilot creation unit 332 creates a pilot signal using information output from the system information management unit 321. Then, pilot creation section 332 outputs the created pilot signal to encoding / modulation section 331.
  • the encoding / modulation unit 331 encodes transmission data output from an application processing unit (not shown) to generate an uplink signal. Also, the encoding / modulation unit 331 receives the pilot signal output from the pilot generation unit 332, the control signal output from the control signal generation unit 333, and the radio channel control information output from the radio channel control information generation unit 334. The upstream signal is generated by encoding. Then, the encoding / modulation unit 331 modulates the encoded uplink signal and outputs the modulated uplink signal to the radio transmission unit 330.
  • the wireless transmission unit 330 performs a transmission operation in accordance with control from the wireless line control unit 322.
  • the wireless transmission unit 330 performs processing such as up-conversion on the uplink signal output from the encoding / modulation unit 331 in the transmission operation. Then, the wireless transmission unit 330 transmits the processed uplink signal with the transmission power P instructed from the wireless line control unit 322 via the antenna 34.
  • ⁇ Operation of eNB 20> 8 and 9 are flowcharts illustrating an example of the operation of the eNB 20.
  • the eNB 20 starts the operation illustrated in FIG. 8 at a predetermined timing after activation, for example.
  • the offset calculation unit 220 of the eNB 20 calculates the NACK occurrence rate for each subframe for each UE 30 at a predetermined timing.
  • the radio network controller 222 determines whether to change the UL / DL configuration for each UE 30 (S100). Whether or not the radio network controller 222 changes the UL / DL configuration for each UE 30 based on, for example, the amount of downlink signal data transmitted from the core network side to the UE 30 and the BSR transmitted from the UE 30. Determine. If it is determined that the UL / DL configuration is not to be changed (S100: No), the wireless line control unit 222 executes the process shown in step S100 again.
  • the radio network controller 222 determines the UL / DL after the change based on the data amount of the downlink signal and the BSR output from the quality information extraction unit 210. Determine the DL configuration. Further, the radio network controller 222 determines the reference transmission power P def of the UE 30 that changes the UL / DL configuration.
  • the radio network controller 222 specifies the first subframe in the changed UL / DL configuration (S101). Then, the radio network controller 222 determines whether or not the second UE 30 to which the UL / DL configuration in which the first subframe is a downlink section is assigned exists in the cell 11 (S102). .
  • the radio network controller 222 When the second UE 30 does not exist (S102: No), the radio network controller 222 outputs the changed UL / DL configuration and reference transmission power P def together with the identification information of the first UE 30 to the transmitter 23. .
  • the transmission unit 23 transmits information on the UL / DL configuration and the reference transmission power P def to the first UE 30 (S106). Then, the wireless line control unit 222 executes the process shown in step S100 again.
  • the eNB 20 starts a process of controlling the offset A of the first UE 30.
  • the radio network controller 222 outputs the changed UL / DL configuration and reference transmission power P def together with the identification information of the first UE 30 to the transmitter 23.
  • the radio network controller 222 obtains information on the first subframe, identification information on the first UE 30, identification information on the second UE 30, and information on the reference transmission power P def of the first UE 30.
  • the offset calculation unit 220 stores the NACK occurrence rate R 1 of the second UE 30 before the UL / DL configuration is changed for the first subframe (S103).
  • the offset calculation unit 220 calculates an initial value A 0 of the offset A applied to the transmission power P of the uplink signal transmitted by the first UE 30 in the first subframe (S104). Then, the offset calculation unit 220 outputs the calculated initial value A 0 of the offset A to the transmission unit 23 together with the information of the first subframe and the identification information of the first UE 30.
  • the transmitter 23 transmits the changed UL / DL configuration, the first subframe, the initial value A 0 of the offset A, and the information of the reference transmission power P def to the first UE 30 (S105).
  • the offset calculation unit 220 resets and starts the timer (S107 in FIG. 9). Then, the offset calculation unit 220 calculates the NACK occurrence rate R 2 of the first subframe after the UL / DL configuration change for the second UE 30 based on the quality information output from the control information extraction unit 211. (S108). Then, the offset calculation unit 220 calculates, as the change amount ⁇ R, a value obtained by subtracting the NACK occurrence rate R 1 stored in step S103 from the NACK occurrence rate R 2 calculated in step S108 (S109).
  • the offset calculation unit 220 determines whether or not the amount of change ⁇ R is greater than or equal to the first threshold R th1 (S110). If the change amount ⁇ R is the first threshold value R th1 or more (S110: Yes), offset calculation section 220 calculates the transmission power P of the first UE30 the case of increasing the offset A change amount .DELTA.A 1 minute (S111). Increasing the offset A change amount .DELTA.A 1 minute, the transmission power P of the first UE30 is decreased change amount .DELTA.A 1 minute. The offset calculation unit 220 determines whether or not the calculated transmission power P is less than or equal to the lower limit value P th (S112).
  • the offset calculation unit 220 When the calculated transmission power P is equal to or lower than the lower limit value P th (S112: Yes), the offset calculation unit 220 outputs an instruction to restore the UL / DL configuration to the radio channel control unit 222, and the eNB 20 The process for controlling the offset A of the first UE 30 is terminated.
  • the radio network controller 222 restores the UL / DL configuration of the first UE 30 (S113). Then, the wireless line control unit 222 executes the process shown in step S100 in FIG. 8 again.
  • offset calculation section 220 a change amount .DELTA.A 1 offset A, output to the transmission section 23 together with the identification information of the first UE30 To do.
  • the transmission unit 23 transmits the change amount ⁇ A 1 of the offset A to the first UE 30 (S114).
  • the transmission power P of the first UE 30 in the first subframe decreases by the change amount ⁇ A 1 .
  • the offset calculation part 220 performs the process shown to step S107 again.
  • the offset calculation unit 220 determines whether or not the change amount ⁇ R is less than the second threshold value R th2 (S115). If the amount of change ⁇ R is less than the second threshold value R th2 (S115: Yes), offset calculation section 220 calculates the transmission power P of the first UE30 when reduced offset A change amount .DELTA.A 2 minutes (S116). Reducing the offset A change amount .DELTA.A 2 minutes, the transmission power P of the first UE30 increases change amount .DELTA.A 2 minutes. Then, the offset calculation unit 220 determines whether or not the calculated transmission power P is greater than or equal to the reference transmission power P def (S117).
  • the offset calculation unit 220 calculates the current offset A value as the offset A change amount ⁇ A 2 ′.
  • the change amount ⁇ A 2 ′ corresponds to the difference between the current transmission power P ′ and the reference transmission power P def .
  • the offset calculation unit 220 a change amount .DELTA.A 2 'of the calculated offset A, and outputs to the transmission section 23 together with the identification information of the first UE 30, and terminates the process of controlling the offset A of the first UE 30 .
  • the transmission unit 23 transmits the change amount ⁇ A 2 ′ of the offset A to the first UE 30 (S118).
  • the wireless line control unit 222 executes the process shown in step S100 in FIG. 8 again.
  • the offset calculation unit 220 transmits the change amount ⁇ A 2 of the offset A together with the identification information of the first UE 30 to the transmission unit 23. Output to.
  • the transmission unit 23 transmits the change amount ⁇ A 2 of the offset A to the first UE 30 (S119).
  • the transmission power P of the first UE 30 in the first subframe increases by the change amount ⁇ A 2 .
  • the offset calculation part 220 performs the process shown to step S107 again.
  • the offset calculation unit 220 determines whether or not the timer value is equal to or greater than a value indicating the predetermined time ⁇ T (S120). When the value of the timer is equal to or greater than the value indicating the predetermined time ⁇ T (S120: Yes), the offset calculation unit 220 ends the process of controlling the offset A of the first UE 30. Then, the wireless line control unit 222 executes the process shown in step S100 in FIG. 8 again. On the other hand, when the value of the timer is less than the value indicating the predetermined time ⁇ T (S120: No), the offset calculation unit 220 executes the process shown in step S108 again.
  • FIG. 10 is a sequence diagram illustrating an example of the operation of the wireless communication system 10.
  • the UE 30-1 is the first UE 30 and the UE 30-2 is the second UE 30.
  • the UE 30-1 transmits a BSR to the eNB 20 (S200).
  • the eNB 20 decides to change the UL / DL configuration of the UE 30-1, the information about the changed UL / DL configuration, the first subframe, the reference transmission power P def , and the initial value A 0 of the offset A is transmitted to the UE 30-1. -1 (S201).
  • the UE 30-1 resets and starts the timer (S202), and transmits a transmission request to the eNB 20 (S203).
  • the eNB 20 transmits a transmission permission to the UE 30-1 (S204).
  • the UE 30-1 starts data transmission in the uplink subframe in the UL / DL configuration after the change transmitted from the eNB 20 in step S201 (S205).
  • the UE 30-1 starts uplink signal transmission with power lower by the initial value A 0 of the offset A than the reference transmission power P def in the section of the first subframe in the UL / DL configuration after the change.
  • the eNB 20 After the UL / DL configuration of the UE 30-1 is changed, the eNB 20 receives the ACK or NACK information transmitted from the UE 30-2 (S206), and calculates the change amount ⁇ R of the NACK occurrence rate. Then, the eNB 20 calculates the change amount ⁇ A of the offset A based on the change amount ⁇ R of the NACK occurrence rate (S207).
  • the eNB 20 transmits the change amount ⁇ A 1 to the UE 30-1, and the change amount ⁇ R of the NACK occurrence rate is less than the second threshold value R th2 If there is, the change amount ⁇ A 2 is transmitted to the UE 30-1 (S208). Then, the UE 30-1 resets and starts the timer (S209). And eNB20, UE30-1, and UE30-2 perform the process after step S203 again.
  • the eNB 20 of this embodiment includes an offset calculation unit 220 and a radio channel control unit 222.
  • the radio network controller 222 is set to the downlink section in the UL / DL configuration before the change, and is changed to the uplink section in the UL / DL configuration after the change.
  • a first subframe that is a subframe is identified.
  • the offset calculation unit 220 instructs the initial value of the transmission power in the first subframe to the first UE 30 that is the UE 30 whose UL / DL configuration has been changed.
  • the offset calculation unit 220 receives the downlink signal reception quality in the first subframe before the UL / DL configuration change and the downlink in the first subframe after the UL / DL configuration change. The amount of change between the reception quality of the signal is calculated. In addition, after the first UE 30 performs transmission with the initial transmission power in the first subframe, the offset calculation unit 220 controls the transmission power instructed to the first UE 30 based on the amount of change. Thereby, when assigning a different UL / DL configuration for each UE 30, it is possible to suppress a decrease in throughput in the downlink section.
  • the offset calculation unit 220 determines that the second UE 30 has failed to receive the downlink signal before the UL / DL configuration is changed, and the second UE 30 receives the downlink signal after the UL / DL configuration is changed.
  • the difference from the rate of failure to receive is calculated as the amount of change.
  • the offset calculation unit 220 transmits an instruction to lower the transmission power by the first power to the first UE 30 when the amount of change in reception quality is equal to or greater than the first threshold. Moreover, the offset calculation part 220 transmits the instruction
  • the offset calculation unit 220 calculates the initial value of the transmission power P of the first UE 30 in the first subframe based on the area of the cell 11 of the eNB 20 and the number of UEs 30 in the cell 11. Thereby, it is possible to prevent the initial value of the transmission power P of the first UE 30 in the first subframe from becoming too large.
  • the radio channel control unit 222 is UL. / DL configuration is changed back to the previous UL / DL configuration. Thereby, it is possible to prevent the first UE 30 whose UL / DL configuration has been changed from continuing the transmission of the uplink signal with the transmission power P that is too low in the first subframe.
  • the offset calculation unit 220 determines the first UE 30 based on the amount of change in reception quality. The transmission power control is terminated. Thereby, the processing load of eNB20 can be reduced.
  • the offset calculation unit 220 when the offset calculation unit 220 has not instructed the first UE 30 for new transmission power for a predetermined time or more after instructing the transmission power to the first UE 30, the first calculation based on the amount of change in reception quality The control of the transmission power of the UE 30 is finished. Thereby, increase of the processing load of eNB20 can be suppressed.
  • FIG. 11 is a diagram illustrating an example of hardware of the communication device 200 that implements the eNB 20.
  • the communication device 200 includes a network interface circuit 201, a memory 202, a processor 203, a wireless circuit 204, and an antenna 205.
  • the radio circuit 204 performs predetermined processing such as modulation on the signal output from the processor 203, and transmits the processed signal via the antenna 205. In addition, the radio circuit 204 performs predetermined processing such as demodulation on the signal received via the antenna 205 and outputs the result to the processor 203.
  • the radio circuit 204 implements the functions of, for example, the radio reception unit 214 of the reception unit 21 and the radio transmission unit 236 of the transmission unit 23.
  • the network interface circuit 201 is an interface for connecting to the core network or another eNB 20 by wired connection.
  • the memory 202 stores programs for realizing the functions of the quality information extraction unit 210, the control information extraction unit 211, the demodulation / decoding unit 212, and the self-interference removal unit 213 of the reception unit 21.
  • the memory 202 also stores programs for realizing the functions of the offset calculation unit 220, the system information management unit 221, and the wireless line control unit 222 of the control unit 22.
  • the memory 202 has functions of a control signal creation unit 230, a pilot creation unit 231, a radio channel control information creation unit 232, an encoding / modulation unit 233, a multiple access processing unit 234, and a delay unit 235 of the transmission unit 23.
  • a program to be realized is stored.
  • the processor 203 reads out the program stored in the memory 202 from the memory 202 and executes it, whereby the quality information extraction unit 210, the control information extraction unit 211, the demodulation / decoding unit 212, and the self-interference removal unit 213 of the reception unit 21. Realize the function. Further, the processor 203 reads out the program stored in the memory 202 from the memory 202 and executes the program, thereby realizing the functions of the offset calculation unit 220, the system information management unit 221 and the wireless line control unit 222 of the control unit 22. .
  • the processor 203 reads out the program stored in the memory 202 from the memory 202 and executes it, thereby performing the functions of the control signal creation unit 230, the pilot creation unit 231 and the radio channel control information creation unit 232 of the transmission unit 23. Realize. Further, the processor 203 reads out the program stored in the memory 202 from the memory 202 and executes it, thereby realizing the functions of the encoding / modulation unit 233, the multiple access processing unit 234, and the delay unit 235 of the transmission unit 23. .
  • FIG. 12 is a diagram illustrating an example of hardware of the communication device 300 that implements the UE 30.
  • the communication apparatus 300 includes an antenna 301, a radio circuit 302, a memory 303, and a processor 304, for example, as shown in FIG.
  • the radio circuit 302 performs predetermined processing such as modulation on the signal output from the processor 304, and transmits the processed signal via the antenna 301.
  • the radio circuit 302 performs predetermined processing such as demodulation on the signal received via the antenna 301 and outputs the result to the processor 304.
  • the radio circuit 302 realizes the functions of, for example, the radio reception unit 310 of the reception unit 31 and the radio transmission unit 330 of the transmission unit 33.
  • the memory 303 stores programs for realizing the functions of the demodulation / decoding unit 311, the system information extraction unit 312, the control signal extraction unit 313, the pilot extraction unit 314, and the line quality measurement unit 315 of the reception unit 31. .
  • the memory 303 stores a program for realizing the functions of the terminal information control unit 320, the system information management unit 321 and the wireless line control unit 322 of the control unit 32. Further, the memory 303 stores programs for realizing the functions of the encoding / modulation unit 331, the pilot creation unit 332, the control signal creation unit 333, and the radio channel control information creation unit 334 of the transmission unit 33.
  • the processor 304 reads out the program stored in the memory 303 from the memory 303 and executes it, thereby realizing the functions of the demodulation / decoding unit 311, the system information extraction unit 312, and the control signal extraction unit 313 of the reception unit 31. Further, the processor 304 reads out the program stored in the memory 303 from the memory 303 and executes it, thereby realizing the functions of the pilot extraction unit 314 and the channel quality measurement unit 315. Further, the processor 304 reads out the program stored in the memory 303 from the memory 303 and executes it, thereby realizing the functions of the terminal information control unit 320, the system information management unit 321 and the wireless line control unit 322 of the control unit 32. To do.
  • the processor 304 reads out the program stored in the memory 303 from the memory 303 and executes the program, whereby the encoding / modulation unit 331, the pilot creation unit 332, the control signal creation unit 333, and the radio channel control of the transmission unit 33
  • the function of the information creation unit 334 is realized.
  • the eNB 20 of the above embodiment changes the offset A by the change amount ⁇ A 1 when the change amount ⁇ R of the NACK occurrence rate of the second UE 30 after the change of the UL / DL configuration is equal to or greater than the first threshold R th1.
  • the transmission power P of the first UE 30 is decreased by the change amount ⁇ A 1 .
  • the disclosed technology is not limited to this.
  • the eNB 20 and the first threshold value R th1 May be instructed to the first UE 30 as the change amount ⁇ A 1 of the offset A.
  • the eNB 20 can recover the reception quality of the second UE 30 more quickly.
  • the eNB 20 of the above embodiment performs UL / DL for the other UE 30 in the cell 11. Do not make configuration changes.
  • the eNB 20 controls the offset A of the transmission power P of the first UE 30 in the cell 11
  • the other cell 11 adjacent to the cell 11 also has another cell 11. You may make it not change a UL / DL structure with respect to UE30 inside.
  • the eNB 20 may instruct the other eNB 20 not to change the UL / DL configuration for a predetermined period. Thereby, eNB20 can exclude the influence of having changed UL / DL structure in the adjacent cell 11 in the change of the NACK incidence rate of 2nd UE30 after changing UL / DL structure. .

Abstract

Selon l'invention, un nœud B évolué (eNB) (20) comprend une unité de calcul de décalage (220) et une unité de commande de ligne sans fil (222). Si une configuration de liaison montante (UL)/liaison descendante (DL) d'un UE quelconque a été changée, l'unité de commande de canal sans fil (222) identifie une première sous-trame qui est un ensemble de sous-trames comme section aval dans la configuration UL/DL avant le changement, et qui est changée en une section amont dans la configuration UL/DL après le changement. L'unité de calcul de décalage (220) fournit à un premier UE dans lequel la configuration UL/DL a été changée une instruction d'une valeur initiale de puissance de transmission dans la première sous-trame. En outre, pour un second UE, l'unité de calcul de décalage (220) calcule la quantité de changement de la qualité de réception de la première sous-trame avant et après le changement de configuration UL/DL. En outre, après que le premier UE a réalisé une transmission dans la première sous-trame à l'aide d'une puissance de transmission correspondant à la valeur initiale, l'unité de calcul de décalage (220), sur la base de la quantité de changement, commande la puissance de transmission dont une instruction doit être fournie au premier UE.
PCT/JP2015/085591 2015-12-18 2015-12-18 Station de base, procédé de commande de station de base et système de communication sans fil WO2017104088A1 (fr)

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Citations (3)

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JP2011504669A (ja) * 2007-11-05 2011-02-10 ノーテル・ネットワークス・リミテッド 資源割り当てのための方法およびシステム
WO2012165067A1 (fr) * 2011-05-30 2012-12-06 ソニー株式会社 Procédé d'attribution de ressources sans fil, dispositif d'attribution de ressources sans fil et système de communication
WO2014163163A1 (fr) * 2013-04-04 2014-10-09 シャープ株式会社 Appareil terminal, procédé de communication et circuit intégré

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US20110235582A1 (en) * 2010-03-25 2011-09-29 Qualcomm Incorporated Subframe dependent transmission power control for interference management

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JP2011504669A (ja) * 2007-11-05 2011-02-10 ノーテル・ネットワークス・リミテッド 資源割り当てのための方法およびシステム
WO2012165067A1 (fr) * 2011-05-30 2012-12-06 ソニー株式会社 Procédé d'attribution de ressources sans fil, dispositif d'attribution de ressources sans fil et système de communication
WO2014163163A1 (fr) * 2013-04-04 2014-10-09 シャープ株式会社 Appareil terminal, procédé de communication et circuit intégré

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