WO2018229950A1 - 基地局装置、端末装置、無線通信システム及び通信方法 - Google Patents
基地局装置、端末装置、無線通信システム及び通信方法 Download PDFInfo
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- 238000004364 calculation method Methods 0.000 claims abstract description 76
- 238000010586 diagram Methods 0.000 description 17
- 238000005516 engineering process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000011664 signaling Effects 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
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- 230000003247 decreasing effect Effects 0.000 description 1
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- H04W52/18—TPC being performed according to specific parameters
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/228—TPC being performed according to specific parameters taking into account previous information or commands using past power values or information
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- H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
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- H04W52/146—Uplink power control
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Definitions
- the present invention relates to a base station device, a terminal device, a wireless communication system, and a communication method.
- next generation for example, 5G (5th generation mobile communication)
- 4G (4th generation mobile communication) standard technology for example, Non-Patent Documents 1 to 11
- 3GPP working groups eg, TSG-RAN WG1, TSG-RAN WG2, etc.
- 5G is classified into eMBB (Enhanced Mobile BroadBand), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications). Support for many use cases is envisioned.
- eMBB Enhanced Mobile BroadBand
- Massive MTC Machine Type Communications
- URLLC Ultra-Reliable and Low Latency Communications
- Efficient wireless communication is, for example, reducing interference between simultaneously transmitted data or reducing power consumption of wireless communication devices such as base station devices and terminal devices.
- a method for reducing the interference of high priority data (for example, URLLC data) from other data for example, eMBB data
- URLLC data for example, URLLC data
- the interference between data was mentioned as an example of efficiency improvement in a radio
- the disclosed technology has been made in view of the above points, and an object thereof is to provide a base station device, a terminal device, a wireless communication system, and a communication method capable of performing efficient wireless communication.
- the base station apparatus disclosed in the present application selects one of a plurality of terms included in an expression for determining transmission power as a first method or a second method. And a transmission unit for transmitting notification information for notifying the calculation method determined by the control unit.
- the base station device According to one aspect of the base station device, the terminal device, the wireless communication system, and the communication method disclosed in the present application, there is an effect that efficient wireless communication can be performed.
- FIG. 1 is a block diagram showing a configuration of a base station apparatus according to Embodiment 1.
- FIG. 2 is a block diagram showing the configuration of the terminal apparatus according to Embodiment 1.
- FIG. 3 is a flowchart showing an operation of the base station apparatus according to Embodiment 1.
- FIG. 4 is a block diagram showing a configuration of the base station apparatus according to Embodiment 2.
- FIG. 5 is a flowchart showing an operation of the base station apparatus according to Embodiment 2.
- FIG. 6 is a diagram illustrating a specific example of a change in the communication environment.
- FIG. 7 is a diagram illustrating a specific example of the specified value by the TPC command.
- FIG. 8 is a block diagram showing a configuration of the base station apparatus according to Embodiment 3.
- FIG. 9 is a sequence diagram showing operations of the wireless communication system according to the third embodiment.
- FIG. 10 is a block diagram showing a configuration of a base station apparatus according to Embodiment 4.
- FIG. 11 is a sequence diagram showing operations of the radio communication system according to the fourth embodiment.
- FIG. 12 is a diagram illustrating a specific example of the specified value by the TPC command.
- FIG. 1 is a block diagram showing a configuration of base station apparatus 100 according to Embodiment 1.
- a base station apparatus 100 shown in FIG. 1 includes a processor 110, a memory 120, a network interface (hereinafter abbreviated as “network I / F”) 130, and a wireless transmission / reception unit 140.
- network I / F network interface
- the processor 110 includes, for example, a CPU (Central Processing Unit), an FPGA (Field Programmable Gate Array), or a DSP (Digital Signal Processor), and performs overall control of the base station apparatus 100 as a whole. Further, the processor 110 determines a method for calculating one term among a plurality of terms included in an equation for determining the transmission power of the communication partner terminal device during communication (during communication).
- a CPU Central Processing Unit
- FPGA Field Programmable Gate Array
- DSP Digital Signal Processor
- the processor 110 determines whether the calculation method of the term x n is the first method or the second method.
- x 1 to x n each represent a term.
- the term x n is a term relating to a value specified from the base station apparatus 100 by, for example, a transmission power control command (hereinafter referred to as “TPC command”).
- the processor 110 calculates the term x n of the above formula (1) by a first method using a relative value based on a past value, or a second method using an absolute value unrelated to the past value. To determine whether to calculate.
- the processor 110 executes this determination not only when communication with the terminal device is started but also during communication. That is, the processor 110 switches the transmission power calculation method by the terminal device during communication.
- the transmission power P UE of the terminal apparatus can be gradually changed, while the term x n is calculated by the second method using the absolute value. In this case, the transmission power P UE of the terminal device can be rapidly changed.
- the memory 120 includes, for example, a RAM (Random Access Memory) or a ROM (Read Only Memory), and stores various types of information when processing is performed by the processor 110.
- a RAM Random Access Memory
- ROM Read Only Memory
- the network I / F 130 is an interface connected to an upper network, and communicates with, for example, a base station apparatus in an adjacent cell via the upper network.
- the radio transmission / reception unit 140 transmits / receives a radio signal to / from the terminal device. That is, the radio transmission / reception unit 140 transmits a radio signal to the terminal device via the antenna, and receives the radio signal transmitted from the terminal device via the antenna.
- the wireless transmission / reception unit 140 when the processor 110 determines a method for calculating one term included in the equation for determining the transmission power of the terminal device, the wireless transmission / reception unit 140 generates notification information for notifying this method, and the terminal device Send to. That is, the wireless transmission / reception unit 140 transmits, for example, notification information indicating whether the term x n of the above formula (1) is calculated by the first method or the second method to the terminal device.
- FIG. 2 is a block diagram showing a configuration of terminal apparatus 200 according to Embodiment 1.
- the terminal device 200 illustrated in FIG. 2 includes a wireless transmission / reception unit 210, a processor 220, and a memory 230.
- the wireless transmission / reception unit 210 transmits / receives a wireless signal to / from the base station device 100. That is, the radio transmission / reception unit 210 transmits a radio signal to the base station apparatus 100 via the antenna, and receives the radio signal transmitted from the base station apparatus 100 via the antenna. Specifically, the wireless transmission / reception unit 210 receives, from the base station apparatus 100, notification information for notifying a method for calculating one term included in an expression for determining transmission power, for example.
- the processor 220 includes, for example, a CPU, FPGA, DSP, or the like, and performs overall control of the entire terminal device 200. Further, the processor 220 controls the transmission power of the radio signal transmitted from the radio transmission / reception unit 210. Specifically, the processor 220 calculates transmission power using an expression for determining transmission power, and sets the calculated transmission power in the wireless transmission / reception unit 210. At this time, the processor 220 calculates the transmission power using, for example, the above equation (1), and calculates the term x n of the equation (1) according to the notification information received by the wireless transmission / reception unit 210. That is, the processor 220 calculates the term x n of the formula (1) by the first method or the second method according to the notification information.
- the memory 230 includes, for example, a RAM or a ROM, and stores various information when processing is executed by the processor 220.
- the processor 110 of the base station apparatus 100 determines whether the calculation method of one term included in the equation for determining the transmission power of the terminal apparatus 200 is the first method or the second method (step S101). ).
- One term for which the calculation method is determined is, for example, the term x n in the above equation (1), and may be a term relating to a value specified by the TPC command.
- the first method is a method of calculating this term using a relative value
- the second method is a method of calculating this term using an absolute value.
- step S102 When the calculation method of the term x n is determined by the processor 110, notification information for notifying this calculation method is generated, and the notification information is transmitted to the terminal device 200 by the wireless transmission / reception unit 140. Thereby, the calculation method of term xn is notified to the terminal device 200 (step S102).
- the transmitted notification information is received by the wireless transmission / reception unit 210 of the terminal device 200. Then, when the processor 220 calculates transmission power using Equation (1), the term x n is calculated by the first method or the second method according to the notification information. The transmission power calculated by the processor 220 is set in the wireless transceiver 210, and the transmission power of the signal transmitted from the wireless transceiver 210 is controlled.
- the transmission power is slowly varying.
- the second method since the term x n is calculated as independent of the absolute value of the past values can be varied rapidly transmit power. For example, if the calculation method of the term x n is switched to the second method by the notification information after the transmission power gradually increases during the period in which the first method is used, the increased transmission power may be rapidly decreased. it can. For this reason, when a significant increase or decrease in transmission power is required, the time until convergence to the target transmission power is shortened by switching the calculation method of the term x n to the second method using an absolute value. can do.
- the terminal device is notified of the calculation method. For this reason, the calculation method of the transmission power of a terminal device can be switched according to a situation. As a result, the time until convergence to the target transmission power can be shortened, and efficient wireless communication can be performed.
- Embodiment 2 The feature of Embodiment 2 is that the calculation method of the transmission power of the terminal device is switched when the wireless environment between the base station device and the terminal device changes abruptly.
- FIG. 4 is a block diagram showing a configuration of base station apparatus 100 according to Embodiment 2. 4, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted. Moreover, since the structure of the terminal device 200 which concerns on Embodiment 2 is the same as Embodiment 1 (FIG. 2), the description is abbreviate
- the processor 110 includes a received power determination unit 310, a calculation method selection unit 320, and a TPC command generation unit 330.
- the received power determination unit 310 monitors the received power of the signal received from the terminal device 200 and determines whether or not the received power has changed significantly. Specifically, the received power determination unit 310 calculates the difference between the received power of the current subframe of the signal received from the terminal device 200 and the received power of the subframe past a predetermined time, and the calculated difference is It is determined whether or not it is a predetermined threshold value or more. Then, the received power determination unit 310 determines that the received power has changed significantly when the calculated difference is equal to or greater than a predetermined threshold. Such a large variation in received power occurs, for example, when the terminal device 200 moves and the presence or absence of an obstacle between the base station device 100 and the terminal device 200 changes.
- the calculation method selection unit 320 selects a calculation method for one term included in the equation for determining the transmission power of the terminal device 200 according to the reception power determination result by the reception power determination unit 310. That is, the calculation method selection unit 320 calculates one term of the expression for obtaining the transmission power by the first method using a relative value based on the past value, or calculates an absolute value unrelated to the past value. Whether to calculate by the second method to be used is selected.
- the transmission power P UE (i) in the subframe i of the terminal device 200 is determined by, for example, the following equation (2).
- Equation (2) min ⁇ A, B ⁇ indicates the minimum value of A and B, and P MAX (i) indicates a predetermined upper limit transmission power.
- M (i) is a term corresponding to the frequency band of the channel, and P O (j) represents transmission power in subframe j that is past subframe i.
- ⁇ (j) PL indicates a path loss in subframe j, ⁇ (i) is a term corresponding to MCS, and f (i) is a term including a value specified by a TPC command.
- the calculation method selection unit 320 sets the calculation method of the term f (i) specified by the TPC command as the first method or the second method among the plurality of terms included in the above equation (2). select. Specifically, the calculation method selection unit 320 selects the first method using the relative value when the reception power determination unit 310 determines that the reception power does not vary significantly. In addition, the calculation method selection unit 320 selects the second method using the absolute value when the reception power determination unit 310 determines that the reception power has changed significantly.
- the calculation method of the term f (i) is the first method
- the term f (i) is calculated using a relative value
- the past term f (i ⁇ 1) is specified by the TPC command.
- the term f (i) is calculated by adding the relative values.
- the calculation method of the term f (i) is the second method
- the term f (i) is calculated using an absolute value, and thus the term f (i) is determined by the absolute value specified by the TPC command. ) Is calculated.
- the radio transmission / reception unit 140 may transmit the notification information to the terminal device 200 by, for example, RRC (Radio Resource Control) signaling.
- RRC Radio Resource Control
- the TPC command generation unit 330 generates a TPC command according to the calculation method of the term f (i) selected by the calculation method selection unit 320. Specifically, the TPC command generation unit 330 specifies a relative value to be added to the term f (i ⁇ 1) in the past of one subframe when the calculation method selection unit 320 selects the first method. A TPC command to be generated is generated. On the other hand, when the second method is selected by the calculation method selection unit 320, the TPC command generation unit 330 generates a TPC command that specifies the absolute value of the transmission power. The TPC command generated by the TPC command generation unit 330 is transmitted from the wireless transmission / reception unit 140 to the terminal device 200.
- the operation of the base station apparatus 100 configured as described above will be described with reference to the flowchart shown in FIG.
- the terminal device 200 calculates the term f (i) of the above equation (2) by the first method using the relative value. Assume that the transmission power is determined.
- the reception power determination unit 310 constantly monitors the reception power of the signal received from the terminal device 200 by the wireless transmission / reception unit 140 (step S201). Then, for example, when the difference between the received power of the current subframe and the received power of the subframe past a predetermined time is less than a predetermined threshold, it is determined that the variation in received power is small (No in step S201). In this case, since the term f (i) is continuously calculated by the first method, the TPC command generating unit 330 generates a TPC command that specifies a relative value (step S204). The generated TPC command is transmitted from the wireless transmission / reception unit 140 to the terminal device 200. Then, the terminal device 200 calculates the term f (i) by adding the relative value specified by the TPC command to the term f (i ⁇ 1) in the past of one subframe, and transmits the transmission power by the above equation (2). To decide.
- step S201 Yes when the difference between the received power of the current subframe and the received power of the subframe in the past for a predetermined time is equal to or larger than a predetermined threshold, it is determined that the variation of the received power is large (step S201 Yes).
- Such fluctuations in received power occur, for example, when the terminal device 200 moves and the presence or absence of the obstacle X between the base station device 100 and the terminal device 200 changes as shown in FIG. That is, in the example illustrated in FIG. 6, since the obstacle X between the base station apparatus 100 and the terminal apparatus 200 disappears due to the movement of the terminal apparatus 200, if the transmission power of the terminal apparatus 200 is constant, the base station apparatus The received power at 100 increases. When the communication environment changes suddenly in this way, it is preferable to change the transmission power of the terminal device 200 rapidly rather than gently.
- the calculation method selection unit 320 selects the second method using the absolute value as the calculation method of the term f (i) in the above equation (2) (step S202). ). And it is notified to the terminal device from the radio
- the TPC command specifying the absolute value is generated by the TPC command generating unit 330 (step S204).
- the TPC command generated by the TPC command generation unit 330 may be the same when specifying a relative value and when specifying an absolute value. That is, for example, as shown in FIG. 7, each TPC command may be associated with both a relative value and an absolute value.
- the TPC command “0” specifies “ ⁇ 1 dB” as a relative value when the first method is selected as the calculation method of the term f (i), and the term f (i When the second method is selected as the calculation method of), “ ⁇ 4 dB” is designated as the absolute value.
- the generated TPC command is transmitted from the wireless transmission / reception unit 140 to the terminal device 200.
- the terminal device 200 calculates the term f (i) based on the absolute value specified by the TPC command, and determines the transmission power by the above equation (2).
- the term f (i) is calculated based on the absolute value, for example, the transmission power that gradually increases during the period when the first method using the relative value was selected can be rapidly reduced. Therefore, for example, when there is no obstacle between the base station device 100 and the terminal device 200, the excessive transmission power of the terminal device 200 can be rapidly reduced, and interference to the surroundings can be rapidly reduced. it can. In addition, it is possible to shorten the period during which the terminal device 200 performs transmission with excessive transmission power, and to reduce the power consumption of the terminal device 200.
- one term included in the equation for determining the transmission power of the terminal apparatus according to whether or not the reception power of the signal received from the terminal apparatus has changed significantly Is determined by either the first method or the second method, and the terminal device is notified of the determined calculation method. For this reason, the calculation method of the transmission power of a terminal device can be switched according to the change of the communication environment between a base station apparatus and a terminal device. As a result, for example, when there is no obstacle between the base station device and the terminal device, interference to the surroundings by the terminal device can be quickly reduced, and efficient wireless communication can be performed.
- a feature of the third embodiment is that when URLLC data is transmitted, a method for calculating transmission power of a terminal device that transmits eMBB data is switched.
- FIG. 8 is a block diagram showing a configuration of base station apparatus 100 according to Embodiment 3.
- the description is abbreviate
- the processor 110 includes a resource specifying unit 410, a calculation method selecting unit 420, and a TPC command generating unit 330.
- the resource specifying unit 410 allows the terminal device 200 (hereinafter referred to as “URLLC terminal 200-1”) that transmits and receives URLLC data having higher priority than other data among the terminal devices 200 in communication with the base station device 100 to the URLLC. Identify the resource to send data. That is, the resource specifying unit 410 specifies the frequency and time used for the transmission of URLLC data by the URLLC terminal device 200-1. Resources used for transmitting URLLC data may be determined in advance, for example, in a predetermined frequency band and a predetermined time in each subframe.
- the calculation method selection unit 420 selects a calculation method for one term included in an expression for determining the transmission power of the terminal device 200 based on the resource specified by the resource specification unit 410. That is, the calculation method selection unit 420 calculates one term of the expression for obtaining the transmission power by the first method using a relative value based on the past value, or calculates an absolute value unrelated to the past value. Whether to calculate by the second method to be used is selected. Note that the expression for obtaining the transmission power may be the same as the above expression (2), for example.
- the calculation method selection unit 420 selects the first method using a relative value for resources other than the resource to which the URLLC data is transmitted. Further, the calculation method selection unit 420 selects the second method using the absolute value for the resource to which the URLLC data is transmitted. Whether the calculation method selection unit 420 has selected the first method or the second method is notified from the wireless transmission / reception unit 140 to the terminal device 200 other than the URLLC terminal 200-1 by the notification information. That is, for example, notification information is transmitted to terminal device 200 (hereinafter referred to as “eMBB terminal 200-2”) that transmits and receives eMBB data having a lower priority than URLLC data. At this time, the radio transmission / reception unit 140 may transmit the notification information to the eMBB terminal 200-2 by RRC signaling, for example.
- the resource identifying unit 410 identifies the resource used for URLLC terminal 200-1 or URLLC data transmission. That is, the resource identifying unit 410 identifies the timing at which the URLLC terminal 200-1 transmits URLLC data.
- the calculation method selection unit 420 selects the first method that uses relative values, and the selected calculation method is notified to the eMBB terminal 200-2 by notification information. For this reason, when the URLLC terminal 200-1 does not transmit URLLC data, the eMBB terminal 200-2 calculates, by the first method, one term related to, for example, a TPC command in the equation for determining the transmission power, and determines the transmission power. To do. Then, the eMBB terminal 200-2 transmits eMBB data with the determined transmission power (step S301).
- the calculation method selection unit 420 selects the second method using the absolute value, and the selected calculation method is determined by the notification information according to the eMBB terminal 200-2. To be notified.
- the eMBB terminal 200-2 calculates, by the second method, one term relating to, for example, the TPC command in the equation for determining the transmission power, and determines the transmission power.
- one term is calculated based on the absolute value specified by the TPC command, for example, the transmission power that gradually increases during the period when the first method using the relative value was selected is rapidly reduced. be able to.
- the eMBB terminal 200-2 transmits the eMBB data with a small transmission power (step S303), and the interference of the eMBB data to the URLLC data is reduced. can do.
- one term included in the equation for determining the transmission power of the terminal apparatus is determined depending on whether the resource is used for transmission of data with high priority. It is determined which of the first method and the second method is used for calculation. And the determined calculation method is notified to the terminal device which transmits data with low priority. For this reason, the calculation method of the transmission power of the terminal device which transmits other data can be switched in the frequency and time when data with high priority are transmitted. As a result, when high-priority data is transmitted, interference received from other data can be reduced, and efficient wireless communication can be performed.
- the feature of the fourth embodiment is that when URLLC data is transmitted, the calculation method of the transmission power of the terminal device that transmits eMBB data in another cell is switched.
- FIG. 10 is a block diagram showing a configuration of base station apparatus 100 according to Embodiment 4.
- the same parts as those in FIGS. 1 and 4 are denoted by the same reference numerals, and the description thereof is omitted.
- the structure of the terminal device 200 which concerns on Embodiment 4 is the same as Embodiment 1 (FIG. 2), the description is abbreviate
- the processor 110 includes a resource specifying unit 510, a terminal position determining unit 520, a calculation method selecting unit 530, and a TPC command generating unit 330.
- the resource identifying unit 510 receives resource information indicating resource allocation in the neighboring cell from the base station apparatus of the neighboring cell via the network I / F 130, and transmits URLLC data having a higher priority than other data in the neighboring cell. Identify the resources used for. That is, the resource specifying unit 510 specifies the frequency and time used for transmitting URLLC data in the adjacent cell.
- the terminal location determination unit 520 determines whether or not the location of each terminal device 200 of the own cell is close to an adjacent cell where URLLC data is transmitted. That is, terminal location determination section 520 determines whether terminal device 200 is located near the center of the own cell or near the cell edge of the own cell. At this time, the terminal position determination unit 520 estimates the distance from the base station apparatus 100 to the terminal apparatus 200 based on, for example, the received power of the signal received from each terminal apparatus 200, and determines the position of the terminal apparatus 200. May be. The terminal device 200 located near the center of the own cell gives relatively small interference to the adjacent cell, but the terminal device 200 located near the cell edge of the own cell gives relatively large interference.
- the calculation method selection unit 530 is included in the equation for determining the transmission power of the terminal device 200 based on the resource specified by the resource specification unit 510 and the position of the terminal device 200 determined by the terminal position determination unit 520. Select a calculation method for one term. That is, the calculation method selection unit 530 calculates one term of the expression for obtaining the transmission power by the first method using a relative value based on the past value, or calculates an absolute value that is unrelated to the past value. Whether to calculate by the second method to be used is selected. Note that the expression for obtaining the transmission power may be the same as the above expression (2), for example.
- the calculation method selection unit 530 selects a first method using a relative value for resources other than the resource to which the URLLC data is transmitted. Moreover, the calculation method selection part 530 selects the 1st method using a relative value with respect to the terminal device 200 which is located near the center of the own cell and is distant from the adjacent cell. On the other hand, the calculation method selection unit 530 selects the second method using the absolute value for the terminal device 200 located near the cell edge of the own cell for the resource to which the URLLC data is transmitted. In other words, the calculation method selection unit 530 selects the first method for the terminal device 200 whose distance from the base station device 100 is less than the predetermined distance, and the distance from the base station device 100 is equal to or greater than the predetermined distance.
- the second method is selected. Whether the calculation method selection unit 530 has selected the first method or the second method is notified from the radio transmission / reception unit 140 to the terminal device 200 in the own cell by the notification information. At this time, the radio transmission / reception unit 140 may transmit the notification information to the terminal device 200 by RRC signaling, for example.
- URLLC terminal 200-1 that transmits / receives URLLC data belongs to cell A formed by base station apparatus 100-1
- eMBB terminal transmits / receives eMBB data to cell B formed by base station apparatus 100-2.
- description will be made assuming that 200-2 and 200-3 belong.
- step S401 resource information indicating resource allocation in each cell is exchanged between base station apparatuses 100-1 and 100-2 (step S401). Therefore, resource information indicating resources used for transmitting URLLC data in the cell A is received by the network I / F 130 of the base station apparatus 100-2 of the cell B and acquired by the resource specifying unit 510. Then, the resource specifying unit 510 specifies the timing at which the URLLC terminal 200-1 transmits URLLC data in the cell A that is a neighboring cell.
- the terminal position determination unit 520 determines the positions of the eMBB terminals 200-2 and 200-3 of the cell B that is the own cell.
- eMBB terminal 200-2 is located near the cell edge of cell B and close to cell A
- eMBB terminal 200-3 is located near the center of cell B and away from cell A. To do.
- the calculation method selection unit 530 selects the first method for the eMBB terminal 200-3. Then, notification information for notifying the first method using the relative value is transmitted from the wireless transmission / reception unit 140 to the eMBB terminal 200-3 (step S402). For this reason, the eMBB terminal 200-3 calculates, by the first method, one term related to, for example, a TPC command in an expression for determining the transmission power, and determines the transmission power.
- URLLC terminal 200-1 transmits URLLC data
- eMBB terminal 200-3 in cell B transmits eMBB data with the transmission power determined by the first method. (Step S404).
- Step S405 since the eMBB terminal 200-3 is away from the cell A, even if the transmission power of the eMBB data is determined by the first method using the relative value, the interference given to the URLLC data of the cell A is relatively small ( Step S405).
- the calculation method selection unit 530 selects the second method for the eMBB terminal 200-2. Then, notification information for notifying the second method using the absolute value is transmitted from the wireless transmission / reception unit 140 to the eMBB terminal 200-2 (step S406). For this reason, the eMBB terminal 200-2 calculates a transmission power by calculating one term related to, for example, a TPC command in an expression for determining the transmission power by the second method.
- the URLLC terminal 200-1 transmits URLLC data in the cell A (step S407)
- the eMBB terminal 200-2 in the cell B transmits eMBB data with the transmission power determined by the second method. (Step S408).
- one term of the equation for obtaining the transmission power of the eMBB data is calculated based on the absolute value specified by the TPC command, for example, during the period when the first method using the relative value is selected.
- the gradually increased transmission power can be rapidly reduced. Therefore, the eMBB terminal 200-2 transmits eMBB data with a small transmission power, and the interference given to the URLLC data of the cell A is relatively small (step S409).
- the transmission power of a terminal device is determined according to the resources used for transmission of high priority data in the neighboring cell and the position of the terminal device in the own cell. It is determined whether one term included in the formula is calculated by the first method or the second method. And the determined calculation method is notified to the terminal device in the own cell. For this reason, the calculation method of the transmission power of the terminal device of a self-cell can be switched in the frequency and time when data with high priority are transmitted in an adjacent cell. As a result, when high-priority data is transmitted in the adjacent cell, interference from the own cell can be reduced and efficient wireless communication can be performed.
- URLLC data is used as an example of high priority data.
- high priority data is not necessarily URLLC data.
- the transmission power of the other data is quickly changed by the second method using the absolute value, Interference from data can be reduced.
- the relative value and the absolute value specified by the TPC command may be the same value. That is, for example, as shown in FIG. 12, each TPC command is associated with one value, and the first method is selected as the method for calculating one term in the equation for obtaining the transmission power. The value specified by the TPC command is used as a relative value. Further, when the second method is selected as the calculation method for one term of the expression for obtaining the transmission power, the value specified by the TPC command is used as the absolute value.
- a value having a large absolute value may not be used as a relative value. That is, for example, as shown in FIG. 12, the values “ ⁇ 8 dB”, “ ⁇ 4 dB”, “6 dB”, and “10 dB” corresponding to the TPC commands “0”, “1”, “6”, and “7” It is not used as a relative value. Therefore, when the first method is selected as the calculation method for one term of the expression for obtaining the transmission power, the TPC commands “0”, “1”, “6”, and “7” are not generated. Thus, by limiting the value used as the relative value, it is possible to reduce the variation in transmission power when the first method is selected.
- the above embodiments can be implemented in combination as appropriate.
- the calculation method of one term of the equation for determining the transmission power is switched. Also good. Further, by combining Embodiments 1 to 4, the calculation method of one term of the equation for determining the transmission power may be switched even when data with high priority is transmitted in the adjacent cell.
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Abstract
Description
図1は、実施の形態1に係る基地局装置100の構成を示すブロック図である。図1に示す基地局装置100は、プロセッサ110、メモリ120、ネットワークインタフェース(以下「ネットワークI/F」と略記する)130及び無線送受信部140を有する。
PUE=x1+x2+…+xn ・・・(1)
プロセッサ110は、例えば項xnの算出方法を第1の方法とするか第2の方法とするかを決定する。ただし、上式(1)において、x1~xnは、それぞれ項を示している。そして、項xnは、例えば送信電力制御コマンド(以下「TPCコマンド」という)によって基地局装置100から指定される値に関する項である。
実施の形態2の特徴は、基地局装置と端末装置の間の無線環境が急激に変化した場合に、端末装置の送信電力の算出方法を切り替える点である。
実施の形態3の特徴は、URLLCデータが送信される際に、eMBBデータを送信する端末装置の送信電力の算出方法を切り替える点である。
実施の形態4の特徴は、URLLCデータが送信される際に、他セルにおいてeMBBデータを送信する端末装置の送信電力の算出方法を切り替える点である。
120、230 メモリ
130 ネットワークI/F
140、210 無線送受信部
310 受信電力判定部
320、420、530 算出方法選択部
330 TPCコマンド生成部
410、510 リソース特定部
520 端末位置判定部
Claims (10)
- 送信電力を決定する式に含まれる複数の項のうち1つの項の算出方法を、第1の方法及び第2の方法のいずれにするかを通信中に決定する制御部と、
前記制御部によって決定された算出方法を通知する通知情報を送信する送信部と
を有することを特徴とする基地局装置。 - 前記制御部は、
前記1つの項の過去の値を基準とした相対値を用いる第1の方法によって前記1つの項を算出するか、前記1つの項の過去の値とは無関係の絶対値を用いる第2の方法によって前記1つの項を算出するかを決定することを特徴とする請求項1記載の基地局装置。 - 前記送信部は、
前記相対値又は前記絶対値に対応する値を指定する送信電力制御コマンドを送信することを特徴とする請求項2記載の基地局装置。 - 前記制御部は、
自装置と端末装置の間の通信環境が変化したか否かを判定し、
通信環境が変化したと判定した場合に、前記第2の方法を選択する
ことを特徴とする請求項2記載の基地局装置。 - 前記制御部は、
第1の端末装置がデータの送信に使用するリソースを特定し、
特定したリソースにおける送信電力の算出方法として、前記第2の方法を選択し、
前記送信部は、
前記第2の方法が選択されたことを示す通知情報を第2の端末装置へ送信する
ことを特徴とする請求項2記載の基地局装置。 - 前記制御部は、
自装置とは異なる基地局装置と通信する第1の端末装置がデータの送信に使用するリソースを特定し、
特定したリソースにおける送信電力の算出方法として、前記第2の方法を選択し、
前記送信部は、
前記第2の方法が選択されたことを示す通知情報を自装置と通信する第2の端末装置へ送信する
ことを特徴とする請求項2記載の基地局装置。 - 前記制御部は、
前記第2の端末装置の位置を判定し、
前記送信部は、
自装置から前記第2の端末装置までの距離が所定距離以上であると判定された場合に、前記第2の方法が選択されたことを示す通知情報を前記第2の端末装置へ送信する
ことを特徴とする請求項6記載の基地局装置。 - 送信電力を決定する式に含まれる複数の項のうち1つの項の算出方法を、第1の方法及び第2の方法のいずれにするかを示す通知情報を通信中に受信する受信部と、
前記受信部によって受信された通知情報に従って、第1の方法又は第2の方法によって送信電力を算出する制御部と、
前記制御部によって算出された送信電力で信号を送信する送信部と
を有することを特徴とする端末装置。 - 基地局装置と端末装置とを有する無線通信システムであって、
前記基地局装置は、
送信電力を決定する式に含まれる複数の項のうち1つの項の算出方法を、第1の方法及び第2の方法のいずれにするかを通信中に決定する第1制御部と、
前記第1制御部によって決定された算出方法を通知する通知情報を送信する送信部とを有し、
前記端末装置は、
前記基地局装置から送信された通知情報を受信する受信部と、
前記受信部によって受信された通知情報に従って、第1の方法又は第2の方法によって送信電力を算出する第2制御部と、
前記第2制御部によって算出された送信電力で信号を送信する送信部とを有する
ことを特徴とする無線通信システム。 - 送信電力を決定する式に含まれる複数の項のうち1つの項の算出方法を、第1の方法及び第2の方法のいずれにするかを通信中に決定し、
決定された算出方法を通知する通知情報を送信する
処理を有することを特徴とする通信方法。
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SAMSUNG: "Evaluation results of superposition scheme in case of multiplexing eMBB and URLLC", 3GPP TSG-RAN WG1 MEETING #86B R1-1609058, no. R1-1609058, 1 October 2016 (2016-10-01), Lisbon, Portugal, XP051159254 * |
See also references of EP3641414A4 |
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JP7390112B2 (ja) | 2019-04-25 | 2023-12-01 | シャープ株式会社 | 端末装置、および、通信方法 |
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CN116528342A (zh) | 2023-08-01 |
KR102377878B1 (ko) | 2022-03-24 |
US20240073828A1 (en) | 2024-02-29 |
US11832194B2 (en) | 2023-11-28 |
KR20200004878A (ko) | 2020-01-14 |
CN110731106B (zh) | 2023-05-30 |
EP3641414A4 (en) | 2020-06-17 |
EP3641414A1 (en) | 2020-04-22 |
CN110731106A (zh) | 2020-01-24 |
US20200112963A1 (en) | 2020-04-09 |
JPWO2018229950A1 (ja) | 2020-04-02 |
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