Technical field

[0001]

　The present invention relates to a base station apparatus, terminal apparatus, a wireless communication system and a communication method.

BACKGROUND

[0002]

　Current network, the traffic of mobile terminals (smartphones and feature phones) accounted for most of the network of resources. In addition, traffic to the mobile terminal use is, there is a tendency to expand in the future.

[0003]

　On the other hand, IoT (Internet of things) service (e.g., transportation systems, smart meter, the monitoring system of the apparatus, etc.) in accordance with the development of, are required to correspond to the services with diverse requirements. Therefore, the next generation (e.g., 5G (fifth generation mobile communications)) In the communication standards, in addition to the 4G standard techniques (4th generation mobile communication) (for example, Non-Patent Documents 1 to 11), even higher data rate reduction, large capacity, a technique for realizing a low delay is demanded. Note that the next generation communication standard, 3GPP working group (e.g., TSG-RAN WG1, TSG-RAN WG2, etc.) techniques discussed have been developed (Non-Patent Documents 12-18).

[0004]

　As described above, in order to meet the various services, the 5G, are classified into eMBB (Enhanced Mobile BroadBand), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communication) support of many use cases have been assumed.

[0005]

　Also, the 5G, to accommodate different products mentioned above, for example reliability, there is an increasing demand for wireless communications such as delay. For example, the URLLC, the error rate in the radio section 10 -5 with ultra high reliability is required that the order of the delay in the radio section to be below 0.5 milliseconds is targeted there. Note that the delay in the radio section below 0.5 milliseconds, 4G wireless systems: a (LTE Long Term Evolution) high requirements of less than 1/10 of.

CITATION

Non-patent literature

[0006]

Non-Patent Document 1: 3GPP TS 36.211 V14.2.0 (2017-03 )
Non-Patent Document 2: 3GPP TS 36.212 V14.2.0 (2017-03 )
Non-Patent Document 3: 3GPP TS 36.213 V14.2.0 (2017-03 )
Non-Patent Document 4: 3GPP TS 36.300 V14.2.0 (2017-03 )
non-Patent Document 5: 3GPP TS 36.321 V14.2.0 (2017-03 )
non-Patent Document 6: 3GPP TS 36.322 V14.0.0 (2017-03 )
non-Patent Document 7 : 3GPP TS 36.323 V14.2.0 (2017-03)
non-Patent Document 8: 3GPP TS 36.331 V14.2.0 (2017-03 )
non-Patent Document 9: 3GPP TS 36.413 V14.2.0 (2017-03 )
non-Patent Document 10: 3GPP TS 36.423 V14.2.0 (2017-03)
non-Patent Document 11: 3GPP TS 36.425 V14.0.0 (2017-03 )
non-Patent Document 12: 3GPP TR 38.801 V14.0.0 (2017-03 )
non-Patent Document 13: 3GPP TR 38.802 V14.0.0 (2017-03)
non-Patent Document 14: 3GPP TR 38.803 V14.0.0 (2017-03 )
non-Patent Document 15: 3GPP TR 38.804 V14.0.0 (2017-03 )
non-Patent Document 16: 3GPP TR 38.900 V14. 2.0 (2016-12)
non-Patent Document 17: 3GPP TR 38.912 V14.0.0 (2017-03 )
non-Patent Document 18: 3GPP TR 38.913 V14.2.0 (2017-03 )
non-Patent Document 19: "New SID Proposal: Study on New Radio Access Technolo gy ", NTT docomo, RP- 160671, 3GPP TSG RAN Meeting # 71, Goteborg, Sweden, 7.-10. March, 2016

Summary of the Invention

Problems that the Invention is to Solve

[0007]

　However, future wireless communication systems (e.g., 5G wireless communication system), the it is desirable to efficient wireless communications than the current radio system. The efficient radio communications, such as those or reducing or reducing interference between data, the power consumption of the wireless communication device such as a base station apparatus and the terminal apparatus are transmitted simultaneously.

[0008]

　For example, it keeps 5G wireless communication system, high priority data (e.g., URLLC data) other data (e.g., EMBB data) is required a method for reducing interference from. As an example of efficiency in a wireless communication system, it has been mentioned interference between data, other conditions (e.g., the power consumption, transmission power, etc.) efficient operation in a wireless communication system is also required in It is, needless to say.

[0009]

　The technology disclosed, which has been made in view of the above, the base station apparatus can perform efficient radio communication terminal device, and an object thereof is to provide a radio communication system and a communication method.

Means for Solving the Problems

[0010]

　Or the base station apparatus disclosed herein enables achieving, in one aspect, a method of calculating the one term of the multiple terms included in the formula for determining the transmission power is in any of the first and second methods the has a control unit for determining in the communication, and a transmission unit that transmits the notification information to notify the calculation method determined by the control unit.

The invention's effect

[0011]

　The base station apparatus disclosed in this application terminal device, according to one embodiment of the wireless communication system and a communication method, an effect that it is possible to perform efficient radio communications.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012]

[1] Figure 1 is a block diagram showing a configuration of a base station apparatus according to the first embodiment.
FIG. 2 is a block diagram showing a configuration of a terminal apparatus according to the first embodiment.
FIG. 3 is a flowchart showing operations of the base station apparatus according to the first embodiment.
[4] FIG. 4 is a block diagram showing a configuration of a base station apparatus according to the second embodiment.
FIG. 5 is a flowchart showing operations of the base station apparatus according to the second embodiment.
FIG. 6 is a diagram showing a specific example of a change in the communication environment.
[7] FIG. 7 is a diagram showing a specific example of a specified value by the TPC command.
[8] FIG. 8 is a block diagram showing a configuration of a base station apparatus according to the third embodiment.
[9] FIG. 9 is a sequence diagram showing operations of the radio communication system according to the third embodiment.
[10] FIG 10 is a block diagram showing a configuration of a base station apparatus according to the fourth embodiment.
[11] FIG. 11 is a sequence diagram showing operations of the radio communication system according to the fourth embodiment.
[12] FIG 12 is a diagram showing a specific example of a specified value by the TPC command.

DESCRIPTION OF THE INVENTION

[0013]

　Hereinafter, the base station apparatus disclosed in this application terminal device, an embodiment of a wireless communication system and a communication method will be described in detail with reference to the drawings. It should be understood that the present invention is not limited by these embodiments.

[0014]

(Embodiment 1)
　FIG. 1 is a block diagram showing a configuration of a base station apparatus 100 according to the first embodiment. The 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 wireless transceiver 140.

[0015]

　Processor 110 is, for example CPU (Central Processing Unit), FPGA (Field Programmable Gate Array) or a DSP (Digital Signal Processor) and the like, which controls the whole base station apparatus 100. The processor 110, upon communication (in communication), among the plurality of sections included in the equation for determining the transmission power of the terminal apparatus of the communication partner, to determine the method of calculating the one term.

[0016]

　That is, for example, a transmission power P of the terminal apparatus UE if is calculated by the equation (1)
　below, P UE = x 1 + x 2 + ... + x n　· · · (1)
processor 110, for example, terms x n calculation of how to determine the second method or the first method. However, in the above equation (1), x 1 ~ x n are each an Section. The term x n is, for example, a section on the value specified by the base station apparatus 100 by the transmission power control command (hereinafter referred to as "TPC command").

[0017]

　Processor 110, term x in the above equation (1) n a, or calculated by the first method of using a relative value based on the past values, a second method of using independent absolute values and past values to determine calculated by. Processor 110, this determines not only at the start of communication with the terminal device, also performed during communication. That is, the processor 110 is in communication, switching the calculation method of the transmission power by the terminal device.

[0018]

　Section x by a first method of using a relative value n when calculating the the transmission power P of the terminal apparatus UE while it is possible to vary slowly and term x by a second method using the absolute value n calculated when the transmission power P of the terminal apparatus UE can be varied rapidly the.

[0019]

　Memory 120 includes, for example, a RAM (Random Access Memory) or ROM (Read Only Memory), when the processing is executed by the processor 110, stores various information.

[0020]

　Network I / F 130 is an interface for connecting to the upper network, via the host network, communicates for example, a base station apparatus of the adjacent cell and.

[0021]

　Wireless transceiver 140 transmits and receives radio signals to and from the terminal device. That is, the wireless transceiver 140 transmits the radio signal to the terminal device via the antenna receives a radio signal transmitted from the terminal apparatus via the antenna. The radio transceiver unit 140, by the processor 110, the method of calculating the one term included in the equation for determining the transmission power of the terminal device is determined, to generate the notification information for notifying this method, the terminal device to send to. That is, the wireless transceiver 140, for example, term x in the above equation (1) n transmits the notification information indicating a calculated by the second method or calculated by the first method to the terminal device.

[0022]

　Figure 2 is a block diagram showing a configuration of a terminal apparatus 200 according to the first embodiment. Terminal apparatus 200 shown in FIG. 2 includes a radio transceiver 210, a processor 220 and memory 230.

[0023]

　Wireless transceiver 210 transmits and receives radio signals with a base station apparatus 100. That is, the wireless transceiver 210 via the antenna to the base station apparatus 100 transmits a radio signal, receives a radio signal transmitted from the base station apparatus 100 via the antenna. Specifically, the wireless transceiver 210 receives a notification information notifying method of calculating the example one term included in the equation for determining the transmission power from the base station apparatus 100.

[0024]

　The processor 220 includes, for example, a CPU, etc. provided with a FPGA DSP, or integrally controls the entire terminal apparatus 200. The processor 220 controls the transmission power of the radio signal transmitted from the wireless transceiver 210. Specifically, the processor 220 sets the transmission power is calculated using the equation for determining the transmission power, sets the transmission power calculated in the wireless transceiver 210. At this time, the processor 220 may calculate the transmission power using the above equation (1), the term x in the formula (1) n The calculated according to the notification information received by the radio transceiver 210. That is, the processor 220, according to the notification information, term x in formula (1) n is calculated by the first or second method.

[0025]

　Memory 230 includes, for example, a RAM or ROM, when the processing is executed by the processor 220, stores various information.

[0026]

　Next, the uplink transmission power control in a wireless communication system having a base station apparatus 100 and the terminal device 200 configured as described above will be described with reference to a flowchart shown in FIG.

[0027]

　By the processor 110 of the base station apparatus 100, or the second method or the method of calculating the one term included in the equation for determining the transmission power of the terminal apparatus 200 to the first method is determined (step S101 ). One term calculation method is determined, for example, term x in the above equation (1) n is, may be a section on the value specified by the TPC command. The first method is a method of calculating the section using the relative value, the second method is a method of calculating the section using the absolute value.

[0028]

　Term x by processor 110 n the method for calculating the is determined, notification information for notifying the calculation method is generated, the notification information by the radio transceiver unit 140 is transmitted to the terminal apparatus 200. Accordingly, terms x n calculation method of is notified to the terminal device 200 (step S102).

[0029]

　Notification information transmitted is received by the wireless transceiver 210 of the terminal apparatus 200. Then, the processor 220, when the calculation of the transmission power using the equation (1) is executed, Section x n for is calculated by the first or second method according to the notification information. Transmission power calculated by the processor 220 is set to the wireless transceiver 210, transmit power of a signal transmitted from the radio transceiver 210 is controlled.

[0030]

　Section x n when the first method is used as the calculation method of Section x n order is calculated past values as a relative value to the reference, the transmission power is slowly varying. Meanwhile, terms x n when the second method is used as the calculation method of Section x n order is calculated as independent of the absolute value of the past values can be varied rapidly transmit power. For example, after the transmission power during the period when the first method is used has been gradually increased, term x by notification information n the method of calculating the is switched to the second method, it is to reduce elevated transmission power abruptly it can. Therefore, if the increase or decrease of significantly transmit power required, terms x n by switching to the second method using the absolute value of the calculation method of, reducing the time to converge to the transmission power which is a target can do.

[0031]

　As described above, according to this embodiment, to determine whether to calculate a one term included in the equation for determining the transmission power of the terminal apparatus in both the first and second methods were determined and notifies the calculation method to the terminal device. Therefore, it is possible to switch in accordance with the method of calculating the transmission power of the terminal apparatus on the situation. As a result, it is possible to shorten the time to converge to the transmission power as a target, it is possible to perform efficient radio communications.

[0032]

(Embodiment 2)
　Features of the second embodiment, when the radio environment between the base station apparatus and the terminal apparatus abruptly changes, a point for switching the calculation method of the transmission power of the terminal apparatus.

[0033]

　Figure 4 is a block diagram showing a configuration of a base station apparatus 100 according to the second embodiment. 4, the same reference numerals are given to the same parts as in FIG. 1, the description thereof is omitted. Further, since the configuration of the terminal device 200 according to the second embodiment is the same as Embodiment 1 (FIG. 2), description thereof is omitted.

[0034]

　As shown in FIG. 4, in the second embodiment, the processor 110 includes a reception power determination unit 310, calculation method selection unit 320 and TPC command generating unit 330.

[0035]

　Reception power determining unit 310 determines whether to monitor the received power of the signal received from the terminal apparatus 200, the received power fluctuates greatly. Specifically, the reception power determination unit 310, the received power of the current subframe of a signal received from the terminal apparatus 200 calculates a difference between the predetermined time received power of the past sub-frame, is calculated difference equal to or larger than a predetermined threshold value. The reception power determination portion 310 determines that the calculated difference is if more than a predetermined threshold value, the received power fluctuates greatly. Significant fluctuations of such a reception power, for example, the terminal device 200 moves to happen if the presence or absence of obstructions between the base station apparatus 100 and the terminal device 200 has changed.

[0036]

　Calculation method selection unit 320, in response to the received power of the determination result by the reception power determination section 310 selects a method of calculating the one term included in the equation for determining the transmission power of the terminal apparatus 200. That is, calculation method selection unit 320, the one term of equation for transmission power, or calculated by the first method of using a relative value relative to the previous value, independent of the absolute value of the past values choose to calculate the second method is used.

[0037]

　Here, the transmission power P in a sub-frame i of the terminal device 200 UE (i) is determined for example by the following equation (2).
[Number 1]

[0038]

　In the formula (2), min {A, B} represents the minimum value of A and B, P MAX (i) denotes the predetermined upper limit transmission power. Further, M (i) is a term corresponding to the frequency band of the channel, P O (j) denotes the transmission power in the past subframe j than the sub-frame i. alpha (j) PL represents the path loss in a subframe j, Δ (i) is a term corresponding to the MCS, f (i) is a term that includes the specified value by the TPC command.

[0039]

　Or calculation method selection unit 320, among the plurality of sections included in the above equation (2), the second method or the first method the calculation method of paragraph f designated (i) by TPC command select. Specifically, calculation method selection unit 320, if the received power is determined not to vary greatly by receiving power determination unit 310 selects the first method using a relative value. Also, calculating method selecting unit 320, if the received power is determined to have varied greatly by the reception power determination section 310 selects the second method using the absolute value.

[0040]

　When the calculation method of claim f (i) and the first method, since the term f (i) is calculated using the relative value, as specified by the TPC command in the past term f (i-1) relative values ​​are added to produce term f (i) is to be calculated that. On the other hand, in the case of the calculation method of claim f (i) and the second method is that term f (i) is calculated using the absolute value, term by the absolute value specified by the TPC command f (i ) is to be calculated.

[0041]

　Calculation method selection unit 320 has either selects any of the first and second methods, is notified to the terminal device 200 from the wireless transceiver 140 by notification information. At this time, the wireless transceiver 140, for example, RRC notification information by (Radio Resource Control) signaling may be transmitted to the terminal apparatus 200.

[0042]

　TPC command generation unit 330, according to the method of calculating the selected term f (i) by the calculation method selection unit 320, generates a TPC command. Specifically, TPC command generator 330, when the first method by the calculation method selection section 320 is selected, specifies a relative value to be added to the 1 sub-frame past term f (i-1) to generate a TPC command to. On the other hand, TPC command generator 330, when the second method by calculation method selection section 320 is selected, generates a TPC command for designating the absolute value of the transmission power. TPC commands generated by the TPC command generation unit 330 is transmitted from the wireless transceiver 140 to the terminal apparatus 200.

[0043]

　Next, the operation of the base station apparatus 100 configured as described above will be described with reference to a flowchart shown in FIG. In the following, it is assumed that the base station apparatus 100 and the terminal device 200 is a wireless communication, in the initial state, the terminal device 200, calculates a term f (i) in the above equation (2) by a first method of using a relative value and, it is assumed that the determined transmission power.

[0044]

　Reception power determining unit 310 always monitors the received power of a signal received from the terminal apparatus 200 by wireless transceiver 140 (step S201). Then, for example, when the difference between the received power and the predetermined time received power of the past sub-frame of the current sub-frame is less than the predetermined threshold value, it is determined that variation of the received power is small (step S201No). In this case, since the continued term f (i) is calculated by the first method, the TPC command generator 330, TPC command that specifies a relative value is generated (step S204). TPC command generated is transmitted from the wireless transceiver 140 to the terminal apparatus 200. Then, the terminal apparatus 200, the 1 sub-frame past term f (i-1), calculates the term f (i) by adding the relative value specified by the TPC command, transmitted by the above equation (2) Power to determine.

[0045]

　On the other hand, for example when the difference between the received power of the received power and the predetermined time past subframe of the current sub-frame is above a predetermined threshold value, it is determined that variation of the received power is large (step S201Yes). Such a variation in received power, for example, as shown in FIG. 6, the terminal device 200 is moved, such as would occur if the existence of an obstacle X between the base station apparatus 100 and the terminal device 200 has changed. That is, in the example shown in FIG. 6, since the obstacle X between the base station apparatus 100 and the terminal device 200 is eliminated by the terminal device 200 has moved, if the transmission power of the terminal apparatus 200 is constant, the base station apparatus received power is increased at 100. The rapidly when the communication environment changes, as, instead of being slowly varying the transmission power of the terminal apparatus 200 preferably changes drastically.

[0046]

　Therefore, when the fluctuation of the received power is large, the calculation method selection unit 320, a method for calculating the term f of the equation (2) (i), a second method using the absolute value is selected (step S202 ). Then, that the second method is selected is notified from the radio transceiver 140 by the notification information to the terminal device (step S203). Further, the term f (i) by a second method using the absolute value is calculated is notified to the TPC command generation unit 330.

[0047]

　Then, the TPC command generator 330, TPC commands for specifying the absolute value is generated (step S204). Incidentally, TPC commands generated by the TPC command generator 330 may be of common to specifying the absolute value and when specifying a relative value. For example, as shown in FIG. 7, each TPC command, both the relative value and the absolute value it may be associated. In the example shown in FIG. 7, for example, TPC command "0", if the first method is selected as the method for calculating the term f (i) specifies the "-1dB" as a relative value, term f (i ) If the second method as a calculation method is selected to specify "-4dB" as an absolute value. Thus, by sharing the TPC command as specifying the absolute value and when specifying a relative value, by suppressing the increase in the number of bits allocated to TPC commands, the control channel for transmitting the TPC command it is possible to reduce the overhead.

[0048]

　TPC command generated is transmitted from the wireless transceiver 140 to the terminal apparatus 200. Then, the terminal apparatus 200 calculates a term f (i) based on the absolute value specified by the TPC command, determines the transmission power by the above equation (2). Here, it is possible to claim on the basis of the absolute value f (i) reduces to be calculated, for example, the transmission power abruptly the first method of using the relative value is increased gradually in the period which has been selected. Thus, for example, when the obstacle between the base station apparatus 100 and the terminal device 200 has run out, the excessive transmission power of the terminal apparatus 200 can be reduced sharply, to rapidly reduce interference to the surrounding it can. Further, it is possible that the terminal apparatus 200 to reduce the time to perform transmission at excessive transmit power, reducing the power consumption of the terminal apparatus 200.

[0049]

　As described above, according to this embodiment, one term included in the formula the received power of the signal received from the terminal device in response to whether or not vary significantly determines the transmission power of the terminal device the determine is calculated by either of the first and second methods, and notifies the determined calculation method to the terminal device. Therefore, in accordance with a change in communication environment between the base station apparatus and the terminal apparatus, it is possible to switch the method of calculating the transmission power of the terminal apparatus. As a result, for example, when an obstacle between the base station apparatus and the terminal apparatus has run out, the interference to the surroundings by the terminal device can be quickly reduced, it is possible to perform efficient radio communications.

[0050]

(Embodiment 3)
　Features of Embodiment 3, when the URLLC data is transmitted, a point for switching the calculation method of the transmission power of the terminal apparatus that transmits eMBB data.

[0051]

　Figure 8 is a block diagram showing a configuration of a base station apparatus 100 according to the third embodiment. 8, the same reference numerals are given to the same parts as in FIG. 1 and FIG. 4, the description thereof is omitted. Further, since the configuration of the terminal device 200 according to the third embodiment is the same as Embodiment 1 (FIG. 2), description thereof is omitted.

[0052]

　As shown in FIG. 8, in the third embodiment, the processor 110 includes a resource identification unit 410, calculation method selection unit 420 and TPC command generating unit 330.

[0053]

　Resource identification unit 410 of the terminal device 200 in communication with the base station apparatus 100, the terminal device 200 to transmit and receive URLLC data a higher priority than other data (hereinafter referred to as "URLLC terminal 200-1") is URLLC identifying a resource for transmitting data. That is, the resource identification unit 410 identifies the frequency and time used for the transmission of URLLC data by URLLC terminal device 200-1. URLLC resources used for transmission of data, for example may be previously determined, such as a predetermined frequency band and a predetermined time in each subframe.

[0054]

　Calculation method selection unit 420, based on the resource identified by the resource identification unit 410, selects a method of calculating the one term included in the equation for determining the transmission power of the terminal apparatus 200. That is, calculation method selection unit 420, the one term of equation for transmission power, or calculated by the first method of using a relative value relative to the previous value, independent of the absolute value of the past values choose to calculate the second method is used. Incidentally, the formula for determining the transmission power may be the same example above equation (2).

[0055]

　Calculation method selection unit 420, for the resources except for the resource URLLC data is transmitted, selects a first method of using a relative value. Further, the calculation method selection unit 420, the resources that URLLC data is transmitted, selects the second method using the absolute value. Calculation method selection unit 420 has either selects any of the first and second methods, is notified from the radio transceiver 140 by the notification information to the terminal apparatus 200 except URLLC terminal 200-1. That is, for example the terminal device 200 URLLC priority than data to transmit and receive low eMBB data (hereinafter referred to as "eMBB terminal 200-2"), the notification information is transmitted. At this time, the wireless transceiver 140, for example, by the RRC signaling may transmit the notification information to eMBB terminal 200-2.

[0056]

　Next, the uplink transmission power control in a wireless communication system having a base station apparatus 100, URLLC terminal 200-1 and eMBB terminal 200-2 which is configured as described above will be described with reference to the sequence diagram shown in FIG.

[0057]

　In the third embodiment, the resource identification unit 410, a resource used to transmit the URLLC data or URLLC terminal 200-1 is specified. That is, the timing of URLLC terminal 200-1 transmits the URLLC data is identified by the resource identification unit 410.

[0058]

　Then, for resources that are not used for the transmission of URLLC data, the first method is selected using a relative value by calculation method selection unit 420, the selected calculation method is reported to eMBB terminal 200-2 by the notification information. Therefore, when the URLLC terminal 200-1 does not send a URLLC data, EMBB terminal 200-2, one section on example TPC commands formula for the transmission power calculated by the first method, determining the transmit power to. Then, EMBB terminal 200-2, the determined transmission power to transmit the EMBB data (step S301).

[0059]

　Then, approaches the timing of URLLC terminal 200-1 transmits the URLLC data, the second method is selected using the absolute value by the calculation method selection unit 420, EMBB terminal by the selected calculation method notification information 200-2 It is notified to. Thus, EMBB terminal 200-2, one section on example TPC commands formula for the transmission power calculated by the second method, to determine the transmission power. Here, since based on the absolute value specified by the TPC command is one term is calculated, to reduce drastically the transmission power, for example, a first method of using the relative value is increased gradually in the period which has been selected be able to. Thus, (Step S302) when URLLC terminal 200-1 transmits the URLLC data, EMBB terminal 200-2 transmits EMBB data with a small transmission power (step S303), reduce interference to URLLC data by EMBB data can do.

[0060]

　As described above, according to this embodiment, depending on whether the resource used for transmission of high priority data, the one term included in the equation for determining the transmission power of the terminal device determining whether to calculate either the first and second methods. Then, the determined calculation method, and notifies the terminal apparatus for transmitting low priority data. Therefore, in the frequency and time that higher priority data is transmitted, it is possible to switch the method of calculating the transmission power of the terminal apparatus for transmitting other data. As a result, when the high priority data is transmitted, it is possible to reduce the interference from the other data, it is possible to perform efficient radio communications.

[0061]

(Embodiment 4)
　Features of Embodiment 4, when URLLC data is transmitted, a point for switching the calculation method of the transmission power of the terminal apparatus that transmits eMBB data in other cells.

[0062]

　Figure 10 is a block diagram showing a configuration of a base station apparatus 100 according to the fourth embodiment. 10, the same reference numerals are given to the same parts as in FIG. 1 and FIG. 4, the description thereof is omitted. Further, since the configuration of the terminal device 200 according to the fourth embodiment is the same as Embodiment 1 (FIG. 2), description thereof is omitted.

[0063]

　As shown in FIG. 10, in the fourth embodiment, the processor 110 includes a resource identification unit 510, the terminal position determination unit 520, calculation method selection unit 530 and TPC command generating unit 330.

[0064]

　Resource identification unit 510 via the network I / F 130 from the base station apparatus of the adjacent cell receives the resource information indicating the resource allocation in adjacent cells, the transmission of URLLC data a higher priority than other data in the adjacent cell identifying a resource to be used for. That is, the resource identification unit 510 identifies the frequency and time used for the transmission of URLLC data in adjacent cells.

[0065]

　Terminal position determination unit 520 determines the terminal device 200 of the respective position of the own cell, whether close to neighboring cells transmitting the URLLC data. That is, the terminal position determination unit 520 determines whether the terminal apparatus 200 or located near the center of the own cell, located near the cell edge of the own cell. In this case, the terminal position determination unit 520, for example based on such a received power of signals received from each terminal device 200, estimates the distance from the base station apparatus 100 to the terminal device 200 determines the position of the terminal device 200 and it may be. Terminal apparatus 200 located near the center of the own cell interference is relatively small to give to the adjacent cell, but the interference is relatively large to the terminal apparatus 200 located near the cell edge of the own cell provides to an adjacent cell.

[0066]

　Calculation method selection unit 530 includes a resource identified by the resource identification unit 510, based on the position of the terminal device 200 is determined by the terminal position determination unit 520, the equation for determining the transmission power of the terminal apparatus 200 selecting a method of calculating the one term. That is, calculation method selection unit 530, the one term of equation for transmission power, or calculated by the first method of using a relative value relative to the previous value, independent of the absolute value of the past values choose to calculate the second method is used. Incidentally, the formula for determining the transmission power may be the same example above equation (2).

[0067]

　Calculation method selection unit 530, for the resources except for the resource URLLC data is transmitted, selects a first method of using a relative value. Further, the calculation method selection unit 530, located near the center of the own cell, for the terminal device 200 that is remote from the adjacent cell, selects the first method using a relative value. On the other hand, calculation method selection unit 530, the resource URLLC data is transmitted for the terminal apparatus 200 located near the cell edge of the own cell, and selects the second method using the absolute value. In other words, calculation method selection unit 530, the distance from the base station apparatus 100 includes the terminal device 200 is less than the predetermined distance by selecting a first method, the distance from the base station apparatus 100 is equal to or greater than the predetermined distance for the terminal device 200 selects the second method. Calculation method selection unit 530 has either selects any of the first and second methods, is notified from the radio transceiver 140 by the notification information to the terminal device 200 of the own cell. At this time, the wireless transceiver 140, for example, the notification information by the RRC signaling may be transmitted to the terminal apparatus 200.

[0068]

　Next, the uplink transmission power control in a wireless communication system having a base station apparatus 100 and the terminal device 200 configured as described above will be described with reference to the sequence diagram shown in FIG. 11. eMBB terminal Hereinafter, the URLLC terminal 200-1 to send and receive URLLC data in the cell A formed by the base station device 100-1 belongs, to send and receive eMBB data in the cell B to be formed by the base station device 100-2 200-2,200-3 will be described as belonging.

[0069]

　In the fourth embodiment, the resource information indicating the resource allocation within each cell between the base station devices 100-1 and 100-2 are exchanged (step S401). Thus, the resource information indicating the resources used for transmission of URLLC data in the cell A is received by the network I / F 130 of the base station device 100-2 cell B, it is obtained by the resource identification unit 510. Then, the resource identification unit 510, the timing of URLLC terminal 200-1 in the cell A is a neighboring cell transmits a URLLC data is identified.

[0070]

　Moreover, the terminal position determination unit 520, the position of the eMBB terminal 200-2,200-3 cell B is a self-cell is determined. Here, EMBB terminal 200-2 are close to the cell A is located near a cell edge of the cell B, a one EMBB terminal 200-3 is away from the cell A located near the center of the cell B to.

[0071]

　For eMBB terminal 200-3 that is remote from the cell A, with respect to the eMBB terminal 200-3, the first method by the calculation method selection section 530 is selected. Then, the notification information for notifying the first method of using the relative value is transmitted from the wireless transceiver 140 to eMBB terminal 200-3 (step S402). Therefore, EMBB terminal 200-3, one section on example TPC commands formula for the transmission power calculated by the first method to determine the transmit power. Then, in the cell A, even when URLLC terminal 200-1 transmits a URLLC data (step S403), eMBB terminal 200-3 in the cell B transmits EMBB data at a transmission power determined by the first method (step S404). At this time, since the eMBB terminal 200-3 is away from the cell A, be determined transmission power of eMBB data by a first method of using a relative value, interference with URLLC data cell A is relatively small ( step S405).

[0072]

　On the other hand, EMBB terminal 200-2 because of the proximity to cell A, with respect to the EMBB terminal 200-2, the second method is selected by the calculation method selection unit 530. Then, the notification information for notifying the second method using the absolute value is transmitted from the wireless transceiver 140 to eMBB terminal 200-2 (step S406). Therefore, EMBB terminal 200-2, one section on example TPC commands formula for the transmission power calculated by the second method, to determine the transmission power. Then, in the cell A, when URLLC terminal 200-1 transmits the URLLC data (step S407), eMBB terminal 200-2 in the cell B transmits EMBB data at a transmission power determined by the second method (step S408). Here, one term of equation for the transmission power of eMBB data, because it is calculated based on the absolute value specified by the TPC command, a period, for example, a first method of using a relative value has been selected the transmission power was gradually increased can be reduced drastically. Therefore, EMBB terminal 200-2 transmits EMBB data with a small transmission power, interference with URLLC data cell A is relatively small (step S409).

[0073]

　As described above, according to this embodiment, the resources used for transmission of the data is high priority in neighboring cells, according to the position of the terminals in the local cell, determine the transmission power of the terminal device the one term included in the formula for determining whether to calculate either the first and second methods. Then, the determined calculation method, and notifies the terminal apparatus in the own cell. Therefore, in the frequency and time that higher priority data is transmitted in adjacent cells, it is possible to switch the method of calculating the transmission power of the terminal apparatus of the own cell. As a result, can be performed in which high priority data is transmitted in adjacent cells, it is possible to reduce the interference from the own cell, an efficient wireless communication.

[0074]

　Incidentally, in the form 3 and 4 above embodiment has been described with reference to URLLC data as an example of the high priority data, high priority data may not necessarily be a URLLC data. In short, in the resource data low delay and high reliability than other data is requested is transmitted, by varying rapidly by a second method using the absolute value of the transmission power of other data, other it is possible to reduce the interference from data.

[0075]

　In the above embodiments, the relative value and the absolute value TPC command designates may be the same value. For example, as shown in FIG. 12, each TPC command, and each one of the values ​​associated with, when the first method is selected as the method of calculating the one term of equation for transmit power the value of the TPC command designates is used as a relative value. When the second method is selected as the method of calculating the one term of equation for transmit power value TPC command designates is used as an absolute value.

[0076]

　In this case, the absolute value is large values, may not be used as a relative value. For example, as shown in FIG. 12, TPC command "0", "1", the value corresponding to "6" and "7", "-8dB", "- 4dB", "6dB" and "10dB" is not used as a relative value. Therefore, when the first method is selected as the method of calculating the one term of equation for transmit power, TPC command "0", "1", "6" and "7" are not generated. Thus, by a value used as a relative value as limiting, it is possible to reduce the variation of the transmission power when the first method is selected.

[0077]

　The above respective embodiments can be implemented in appropriate combination. For example, by combining the first to third embodiments, when and priority if the communication environment changes is high data is transmitted, so as to be switched calculation method of one term of equation for determining the transmission power it may be. Furthermore, by combining the first to fourth embodiments, if the high priority data is transmitted in neighboring cells also may be is switched calculation method of one term of equation for determining the transmission power.

DESCRIPTION OF SYMBOLS

[0078]

　110, 220 processors
　120,230 memory
　130 network
　I / F 140 and 210 wireless transceiver
　310 receives the power determination unit
　320,420,530 calculation method selection unit
　330 TPC command generator
　410, 510 resource identification unit
　520 terminal location determination unit

The scope of the claims

[Requested item 1]

　The method of calculating the one term of the multiple terms included in the formula for determining the transmission power, and a control unit for determining during communication or to any of the first and second methods,
　by the controller a transmission unit for transmitting the notification information for notifying the determined calculation method
　the base station apparatus characterized by having a.

[Requested item 2]

　The control unit may
　either calculate the one first of said one term by a method using relative value based on the past values of the term, the independent absolute values and past values of the one term the base station apparatus according to claim 1, wherein the determining whether to calculate the one term by the second method employed.

[Requested item 3]

　And the transmission unit,
　the base station apparatus according to claim 2, wherein the transmitting a transmission power control command specifying a value corresponding to the relative value or the absolute value.

[Requested item 4]

　Wherein,
　the communication environment between the own apparatus and the terminal apparatus determines whether or not changed,
　when it is determined that the communication environment changes, selects the second method
　claims, characterized in that the base station apparatus of claim 2 wherein.

[Requested item 5]

　Wherein,
　the first terminal device to identify a resource to be used for transmission of data,
　as a method of calculating the transmission power in a specific resource, selects the second method,
　the transmission unit,
　the second way to send notification information indicating that it has been selected to the second terminal device
　the base station apparatus according to claim 2, wherein a.

[Requested item 6]

　Wherein the control unit
　identifies a resource that a first terminal device communicating with different base station apparatus and the own apparatus is used for the transmission of data,
　as a method of calculating the transmission power in a specific resource, the second method selected,
　and the transmission unit,
　transmits notification information indicating that the second method is selected to the second terminal device communicating with its own device
　base station apparatus according to claim 2, wherein a.

[Requested item 7]

　Wherein the control unit
　determines the position of the second terminal device,
　and the transmission unit,
　when the distance from the radar device to the second terminal device is determined to be a predetermined distance or more, the second way to send notification information indicating that it has been selected to the second terminal device
　the base station apparatus according to claim 6, wherein a.

[Requested item 8]

　A receiving portion in which a plurality of one way of calculating the term of the term, to receive notification information indicating whether to either of the first and second methods in communication included in the equation for determining the transmission power,
　according to the notification information received by the receiving unit, and a control unit for calculating the transmission power by the first or second method,
　a transmitter for transmitting a signal at the transmission power calculated by the control unit
　to have a terminal device according to claim.

[Requested item 9]

　A wireless communication system comprising a base station apparatus and a terminal apparatus,
　the base station apparatus,
　a method of calculating the one term of the multiple terms included in the formula for determining the transmission power, the first method and the a first controller for determining during communication or to any of the second method,
　and a transmission unit that transmits the notification information to notify the calculation method determined by the first control unit,
　the terminal device ,
　a receiver for receiving the notification information transmitted from the base station apparatus,
　according to the notification information received by the receiving unit, a second control unit which calculates the transmission power by the first or second method,
　and a transmission unit for transmitting a signal at the transmission power calculated by the second control unit
　wireless communication system, characterized in that.

[Requested item 10]

　The method of calculating the one term of the multiple terms included in the formula for determining the transmit power, whether to one of the first and second methods to determine during the communication,
　notifying the determined calculation method It transmits the notification information
　communication method characterized by having a process.