CN113424601A

CN113424601A - Terminal and wireless communication control method

Info

Publication number: CN113424601A
Application number: CN201980092130.3A
Authority: CN
Inventors: 小熊优太; 古田敬幸
Original assignee: NTT Docomo Inc
Current assignee: NTT Docomo Inc
Priority date: 2019-02-14
Filing date: 2019-02-14
Publication date: 2021-09-21
Also published as: WO2020166040A1

Abstract

A terminal is provided with: a reception unit that receives control information related to transmission power in a first frequency band; and a control unit that controls a communication operation in the second frequency band based on the control information.

Description

Terminal and wireless communication control method

Technical Field

The present disclosure relates to a terminal and a wireless communication control method.

Background

In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high data rate, low latency, and the like. Further, for the purpose of further widening LTE bandwidth and increasing LTE speed, systems following LTE are also being studied. In the systems following LTE, there are, for example, systems called LTE-Advanced (LTE-a), Future Radio Access (FRA)), fifth generation mobile communication system (5G)), 5G plus (5G +), Radio Access Technology (New-RAT), New Radio (NR)), and the like.

In a wireless communication system, it is known that interference to other devices is reduced by performing transmission power control by a wireless communication apparatus (for example, a terminal) (for example, non-patent document 1).

Documents of the prior art

Non-patent document

Non-patent document 1: 3GPP TS 36.101v16.0.0, "User Equipment (UE) radio transmission and reception (Release 15)," Decumber 2018

Disclosure of Invention

Problems to be solved by the invention

However, there is room for further research regarding a method for reducing interference that the wireless communication apparatus applies to other devices, compared to the related art.

An object of the present disclosure is to further reduce interference that a wireless communication apparatus exerts on other devices, compared to the prior art.

Means for solving the problems

A terminal according to one aspect of the present disclosure includes: a reception unit that receives control information related to transmission power in a first frequency band; and a control unit that controls a communication operation in the second frequency band based on the control information.

Effects of the invention

According to the present disclosure, interference that the wireless communication apparatus exerts on other devices can be further reduced as compared with the related art.

Drawings

Fig. 1 is a block diagram showing an example of the configuration of a base station according to an embodiment.

Fig. 2 is a block diagram showing an example of the configuration of a terminal according to an embodiment.

Fig. 3 is a flowchart showing an example of a control flow by the control method 1 according to the embodiment.

Fig. 4 is a flowchart showing an example of a control flow by the control method 2 according to the embodiment.

Fig. 5 is a flowchart showing an example of a control flow by the control method 3 according to the embodiment.

Fig. 6 is a diagram showing an example of hardware configurations of a base station and a terminal according to an embodiment.

Detailed Description

Hereinafter, an embodiment of one embodiment of the present disclosure will be described with reference to the drawings.

In NR, a frequency band including existing LTE and having a wider width than that of LTE is used. For example, in NR, Frequency bands are classified into 2 groups of Frequency bands called Frequency Range 1(FR1)) and Frequency Range 2(FR 2)). FR1 denotes a frequency band below 6 GHz. FR1 is also referred to as 6 or less (less than 6(Sub 6)). Further, FR2 denotes a higher frequency band than FR1, for example, including the millimeter wave band.

In wireless communication using FR1 of the conventional LTE frequency band and NR, transmission power control is defined. For example, when the base station instructs the terminal to control the transmission power, information to be notified to the terminal by the base station is defined. Control information indicating transmission power control is sometimes described as Pmax or Pmax control information, for example.

Hereinafter, the LTE band may be referred to as an "LTE band". In the following, FR1 for NR and FR2 for NR are sometimes referred to as "FR 1" and "FR 2", respectively. In addition, FR1 of the LTE band and/or NR may be hereinafter referred to as "LTE/FR 1".

For example, in a wireless communication system supporting communication of LTE/FR1, when the transmission power of a terminal is suppressed in a location (for example, a hospital) where a precision device affected by radio waves is used and in interference adjustment for another system, Pmax is specified from the base station side. Pmax represents, for example, the maximum value of transmission power. The terminal controls the transmission power based on Pmax, for example, in a range below Pmax.

However, in a wireless communication system supporting communication of FR2, transmission power control is not specified. Therefore, for example, in a place (for example, a hospital) where a precision device affected by a radio wave is used and in interference adjustment for another system, there is room for study on transmission control (for example, transmission power control) for FR 2.

When transmission power control is not performed in a wireless communication system supporting communication of FR2, for example, a precision device affected by radio waves may malfunction or cause interference with other systems. Due to such a concern, there is a concern that there is a limitation in the configuration of a device (e.g., a base station) supporting FR 2.

Further, for example, in an area where NR communication is possible, when a terminal receives a signal of FR2 (for example, a millimeter wave band) from a base station, a signal of FR2 (for example, a millimeter wave band) may be transmitted in accordance with the reception. For example, when receiving a Reference Signal (Reference Signal) of FR2 (for example, millimeter wave band), a terminal may form a directional beam in an Uplink (UL) in order to report Reference Signal Received Power (RSRP) and transmit an UL Signal.

Since the base station and the terminal are far apart from each other, in the peripheral area of the terminal, the power of an UL signal transmitted by the terminal is higher than the power of a downlink (dl) signal received by the terminal. Therefore, in the peripheral area of the terminal, there is a possibility that malfunction occurs in a precision device affected by the radio wave or interference with another system occurs.

In this embodiment, a technique of reducing interference that a wireless communication apparatus (for example, a terminal) applies to other devices by controlling a communication operation in FR2 will be described.

In addition, the communication operation in the present disclosure may include an operation (transmission operation) in which the terminal transmits an UL signal, an operation (reception operation) in which the terminal receives a DL signal, and an operation in which the terminal searches for a signal from the base station. Further, in the transmission operation and the reception operation, an operation of forming a beam and scanning the formed beam may be included.

[ Structure of base station and terminal ]

Fig. 1 is a block diagram showing an example of the configuration of a base station 10 according to the present embodiment. For example, the base station 10 includes a transmitting unit 101, a receiving unit 102, and a control unit 103.

The base station 10 according to the present embodiment communicates with the terminal 20 (see fig. 2) in the LTE band and/or FR1 and FR 2. In addition, a base station communicating with terminal 20 in the LTE band, a base station communicating with terminal 20 in FR1, and a base station communicating with terminal 20 in FR2 may be different base stations, respectively. Alternatively, the base station may support part or all of communication of LTE band, communication of FR1, and communication of FR 2.

Transmission section 101 transmits a DL signal for terminal 20 to terminal 20. For example, transmission section 101 transmits a DL signal under the control of control section 103.

In the case where the base station 10 supports communication of LTE, information indicating transmission power control in LTE may be included in a DL signal transmitted by the base station 10. Further, in the case where the base station 10 supports communication of FR1, information indicating transmission power control in FR1 may be included in the DL signal transmitted by the base station 10. For example, information related to transmission power control in LTE or FR1 is referred to as Pmax. Pmax represents the maximum value of transmission power in LTE or FR1, for example.

The reception unit 102 receives the UL signal transmitted from the terminal 20. For example, the reception unit 102 receives the UL signal by the control of the control unit 103.

Control section 103 controls transmission processing in transmission section 101 and reception processing in reception section 102. For example, control section 103 receives data, control information, and the like from an upper layer not shown, and outputs the data and control information to transmission section 101. Further, control section 103 outputs the data and control information received from reception section 102 to the higher layer.

In the case where the base station 10 supports communication of LTE, the control unit 103 may determine whether or not to instruct the terminal 20 to transmit power control in LTE. Further, in the case where the base station 10 supports communication of FR1, the control unit 103 may determine whether or not to instruct the terminal 20 of transmission power control in FR 1. Control section 103 may determine Pmax for terminal 20 that instructs transmission power control, and output the determined Pmax to transmission section 101.

Fig. 2 is a block diagram showing an example of the configuration of the terminal 20 according to the present embodiment. For example, the terminal 20 includes a receiving unit 201, a transmitting unit 202, and a control unit 203.

The terminal 20 of the present embodiment communicates with the base station 10 in the LTE band and/or FR1 and FR 2. In addition, a base station communicating with terminal 20 in the LTE band, a base station communicating with terminal 20 in FR1, and a base station communicating with terminal 20 in FR2 may be different base stations, respectively. Alternatively, the base station with which the terminal 20 communicates may support part or all of the communication of the LTE band, the communication of FR1, and the communication of FR 2.

For example, the terminal 20 may be connected with the base station 10 operating in the LTE band and/or FR1 and the base station 10 operating in FR2 through Dual Connectivity (DC).

In addition, hereinafter, the base station 10 operating in the LTE band and/or FR1 is sometimes referred to as "LTE/FR 1 base station 10". The LTE/FR1 base station 10 supports communication in at least one of the LTE band and FR1, but may support communication in FR2, for example. Further, a base station 10 operating in FR2 is sometimes described as an "FR 2 base station 10". The FR2 base station 10 supports at least communication of FR2, but may also support communication of LTE band domain and/or FR1, for example.

The reception unit 201 receives a DL signal transmitted from the base station 10. For example, receiving section 201 receives a DL signal in the frequency band of LTE and/or FR1 under the control of control section 203. Further, for example, the reception unit 201 receives a DL signal in FR2 by the control of the control unit 203. Further, the transmission source of the DL signal received by the reception unit 201 may be the same base station 10 (base station 10 operating in the LTE frequency band and/or FR1, and FR2) or different base stations 10 (e.g., LTE/FR1 base station 10 and FR2 base station 10).

The transmission unit 202 transmits the UL signal to the base station 10. For example, the transmission unit 202 transmits the UL signal in the LTE band and/or FR1 under the control of the control unit 203. Further, for example, transmitting section 202 transmits an UL signal in FR2 under the control of control section 203. The destination of the UL signal transmitted by the transmission section 202 may be the same base station 10 or may be a different base station 10.

The control unit 203 controls a communication operation including a reception process in the reception unit 201 and a transmission process in the transmission unit 202. For example, control section 203 detects Pmax included in a DL signal in the LTE band and/or FR 1. For example, when Pmax included in a DL signal in the LTE band is detected, control section 20 controls transmission power in the LTE band based on Pmax. For example, when Pmax included in the DL signal in FR1 is detected, control section 20 controls the transmission power in FR1 based on Pmax. Further, when Pmax included in a DL signal in the LTE band and/or FR1 is detected, control section 203 controls a communication operation in FR2 based on Pmax.

In addition, when the operation is performed in FR2, the terminal 20 may form a beam having directivity. For example, in case of transmitting UL signals, the terminal 20 may form a beam in a specific direction. Further, the terminal 20 may also scan a beam in the case of searching for a base station 10 to connect to in FR2, and/or in the case of searching for a DL signal including control information and the like from the base station 10 in FR 2.

Here, the control of the communication operation of the terminal 20 in FR2 may include, for example, any one or more of control of the transmission power of the UL signal in FR2, control of on (continuation) or off (stop) of communication (e.g., transmission of the UL signal), control of beam patterns, and the like.

In addition, terminal 20 may be a stand-alone (SA) operation of FR 2. Alternatively, the terminal 20 may be operated in a Non-Standalone (NSA) mode. For example, the terminal 20 may communicate in a combination of FR1 and/or LTE band domains, and FR 2.

Hereinafter, 3 control methods are exemplified for the control of the communication operation. The control method in the present disclosure is not limited to these 3 methods.

[ control method 1]

In the control method 1, the terminal 20 controls whether to reduce the transmission power of the UL signal in FR2 based on the control information on the transmission power in the LTE band and/or FR 1.

For example, receiving section 201 of terminal 20 receives control information (e.g., Pmax) related to transmission power in the LTE band and/or FR1, and control section 203 controls whether to reduce transmission power of the UL signal in FR2 based on the control information.

For example, control for reducing the transmission power may be performed in a baseband chip that performs baseband signal processing such as modulation processing. Alternatively, the control for reducing the transmission power may be performed by measuring the transmission power in an RF device that performs signal processing in a Radio Frequency (RF) band such as Frequency conversion (up conversion) and adjusting the transmission power based on the measured transmission power.

The control for reducing the transmission Power may be a control for reducing the Total Radiated Power (TRP) or Peak Equivalent Isotropic Radiated Power (Peak eirp) of the terminal by setting Power-Maximum Power Reduction (P-MPR), which is an example of a back-off value of the Maximum transmission Power for the terminal.

For example, as for the control of reducing the transmission power, it may be a control of reducing the peak eirp (peak eirp) by changing the beam pattern of the transmission beam.

For example, the control of reducing the transmission power may be a control of reducing the power of a beam directed in a specific direction (for example, a direction in which it is desired that the radio wave of FR2 does not reach) by changing the beam pattern of the transmission beam. The control of reducing the power of the beam in a specific direction may be, for example, control of directing Null (Null) in a specific direction.

In addition, when the terminal 20 receives Pmax, control for reducing the transmission power may be performed actively (independently). The active control corresponds to autonomous control, for example, control performed independently of an instruction from the base station 10 regarding the magnitude of transmission power.

Alternatively, terminal 20 may notify base station 10 of the reduction of transmission power in FR 2. In this case, the base station 10 may decrease the transmission power instructed to the terminal 20 and instruct the terminal 20 of the decreased transmission power.

In the above example, the terminal 20 reduces the transmission power based on the presence or absence of reception of Pmax when Pmax is received, but the present disclosure is not limited thereto. For example, the terminal 20 may determine whether to reduce the transmission power based on the value indicated by Pmax and/or the number of received Pmax. For example, when the terminal 20 determines to reduce the transmission power, the reduction degree of the transmission power may be controlled based on the value indicated by Pmax and/or the number of received Pmax.

For example, the terminal 20 may set a first threshold value to be compared with the value of Pmax, and determine whether to reduce the transmission power based on the result of the comparison. For example, the terminal 20 may decrease the transmission power when the value of Pmax is equal to or less than the first threshold, and may not decrease the transmission power when the value of Pmax is greater than the first threshold. Further, it is also possible to set a second threshold value that is equal to or lower than the first threshold value, and the terminal 20 controls the reduction width by which the transmission power is to be reduced based on the result of the comparison. For example, the terminal 20 may change the reduction width of the transmission power to be reduced when the value of Pmax is equal to or less than the second threshold value and when Pmax is greater than the second threshold value.

Pmax is information related to power control in the LTE band and/or FR1, but it can be assumed that power control in FR2 is also desirable in an area where power control is desired in the LTE band and/or FR 1. Therefore, the terminal 20 may determine whether or not to reduce the transmission power in FR2 based on the magnitude of the value Pmax, that is, the magnitude of the power to be reduced in FR1, and may control the reduction width of the transmission power when the transmission power is to be reduced.

Further, for example, the terminal 20 may also determine whether to reduce the transmission power based on the number of Pmax received at every specific time (every specific time period). For example, the terminal 20 may decrease the transmission power when the number of received Pmax is equal to or greater than a specific number; when the notified number of Pmax is smaller than a specific number, the transmission power is not reduced. Further, the terminal 20 may also control the reduction range of the transmission power to be reduced based on the number of Pmax received per unit time.

The terminal 20 may receive a plurality of Pmax, for example, the terminal 20 may receive notification of Pmax from a plurality of LTE/FR1 base stations 10. Further, for example, the specific number may be an integer of 1 or more.

For example, it is estimated that, when a certain number or more of base stations 10 (for example, 2 or more of base stations 10) notify Pmax, the requirement for power control of the area in which the base stations 10 are installed is stricter than when less than the certain number of base stations 10 (for example, 1 of base stations 10) notify Pmax. Therefore, the terminal 20 may determine whether or not to reduce the transmission power based on the number of received Pmax, and may control the reduction width of the transmission power when the transmission power is to be reduced.

For example, the terminal 20 may determine whether or not to reduce the transmission power based on both the value of Pmax and the number of Pmax. For example, the terminal 20 may determine that the transmission power is to be reduced when Pmax equal to or smaller than the threshold is received by a predetermined number or more, and may determine not to reduce the transmission power when Pmax is not received by the threshold. For example, the terminal 20 may control the reduction width in the case of reducing the transmission power based on both the value of Pmax and the number of Pmax.

The terminal 20 may determine whether or not to reduce the transmission power based on other information, not limited to Pmax notified from the base station 10. For example, the terminal 20 may determine whether to reduce the transmission power based on the location information of the other device.

For example, a device (hereinafter, sometimes referred to as "reference device") that operates in the LTE band and/or FR1 and notifies the LTE/FR1 base station 10 of the location information may be provided in an area that needs to be protected from radio waves (hereinafter, sometimes referred to as "protection area"). Here, the set reference device supports the transmit power control of the LTE band and/or FR1 based on Pmax.

For example, the terminal 20 receives the location information of the terminal 20 and the base station 10 receives the location information of the reference device via LTE/FR 1. The terminal 20 may determine whether the terminal 20 exists in the protection area based on the location information of the terminal 20 and the location information of the reference device. Then, in the case of existence in the protection area, the terminal 20 may reduce the transmission power in the FR 2.

In addition, the FR2 base station 10 may receive the location information of the reference device via the LTE/FR1 base station 10, for example, and determine the direction in which the protection area exists. Then, the FR2 base station 10 can perform control to make the beam not face the determined direction. In this case, even in the case of existence in the protection area, since the terminal 20 does not communicate with the FR2 base station 10 in the FR2, the UL signal of the FR2 may not be transmitted.

Further, in the case of receiving Pmax, the terminal 20 can estimate the distance between the base station 10 and the terminal 20 based on the reference signal from the base station 10 in the LTE band and/or FR1, and control the transmission power.

For example, when the distance between the LTE/FR1 base station 10 and the terminal 20 is equal to or greater than a predetermined distance, the terminal 20 that is determined to be a protection area near the LTE/FR1 base station 10 does not reduce the transmission power in FR 2. On the other hand, when the distance is shorter than the predetermined distance, the terminal 20 lowers the transmission power in the FR 2.

Next, an example of a flow of control by the control method 1 will be described.

Fig. 3 is a flowchart showing an example of a control flow in the control method 1 according to the present embodiment. The flowchart shown in fig. 3 starts, for example, when the terminal 20 receives Pmax from the base station 10.

The terminal 20 receives Pmax from the base station 10 (S101).

The terminal 20 performs transmission power control of LTE and/or FR1 based on Pmax (S102).

The terminal 20 determines whether or not Pmax received at every specific time is equal to or greater than a specific number (S103). In addition, in the case where the specific number is 1, the terminal 20 may not perform the determination process.

If the received Pmax is not equal to or greater than the specific number (no in S103), the control flow based on the control method 1 ends.

When the received Pmax is equal to or greater than the specific number (yes in S103), the terminal 20 determines whether or not Pmax is equal to or less than a first threshold value (S104).

When the received Pmax is plural, Pmax to be compared with the first threshold value may be all or part of the plural Pmax, may be the smallest Pmax of the plural Pmax, may be the largest Pmax, or may be an average of the plural Pmax.

If Pmax is not equal to or less than the first threshold value (no in S104), the control flow based on the control method 1 ends.

When Pmax is equal to or lower than the first threshold value (yes in S104), the terminal 20 determines whether or not data communication is being performed in FR2 (S105).

If data communication is not being performed (no in S105), the terminal performs transmission power control of FR2 based on Pmax (S106).

Then, the terminal 20 continues the signal search in FR2 (S107). Then, the control flow based on the control method 1 ends.

When data communication is being performed (yes in S105), the terminal 20 determines to perform transmission power control of FR2 (S108).

Then, the terminal 20 determines whether Pmax is equal to or less than the second threshold value (S109). In addition, for example, the second threshold may be equal to or lower than the first threshold used in S104.

When Pmax is equal to or smaller than the second threshold value (yes in S109), the terminal 20 sets the reduction width of the transmission power of FR2 to the first reduction width (S110). For example, the first reduction width is larger than a second reduction width in S111 described later. The terminal 20 continues data communication with the transmission power reduced by the first reduction amount. Then, the control flow based on the control method 1 ends.

If Pmax is not equal to or smaller than the second threshold value (no in S109), the terminal 20 sets the reduction width of the transmission power of FR2 to the second reduction width (S111). The terminal 20 continues data communication with the transmission power reduced by the second reduction amount. Then, the control flow based on the control method 1 ends.

In the control flow described above, one or both of the processes in S103 and S104 may be skipped. For example, as described above, in the case where the terminal 20 controls the communication operation based on the presence or absence of Pmax, the processing of both S103 and S104 may not be executed. In this case, for example, after the processing of S102, S103 and S104 may be skipped.

Further, for example, in the case where the communication operation is not controlled based on the number of received Pmax, the process of S103 may not be performed. In this case, for example, after the processing of S102, S103 may be skipped.

Further, for example, in the case where the communication operation is not controlled based on the value of Pmax, the process of S104 may not be performed. In this case, for example, after the processing of S103, S104 may be skipped.

In addition, in the control flow described above, the terminal 20 may determine whether or not to reduce the transmission power based on the information on the position of the other device in addition to the processing of S103 and S104 or instead of at least one of the processing of S103 and S104. The information on the location of the other device may be, for example, the distance between the terminal 20 and the base station 10, or may be location coordinates of a device operating in the LTE band and/or FR1 and supporting transmission power control based on Pmax.

For example, in the control flow described above, the terminal 20 may decrease the transmission power in steps in S110 and/or S111. For example, the terminal 20 may decrease the transmission power 1dB at a time per unit time. In this case, the initial reduction range and the stepwise reduction range of the transmission power may be set in advance or may be notified from the base station 10. For example, in S110, the initial reduction width may be set larger than S111, and the reduction width that is reduced in stages may be set larger than S111.

Further, in S111, terminal 20 may not perform transmission power control of FR 2.

In the control flow described above, the processing in S109 to S111 is processing for changing the setting of the reduction width of the transmission power of FR2 according to the value of Pmax, but these processing may be omitted.

For example, in the processing in S109 to S111, instead of setting the reduction width of the transmission power, a predetermined reduction width of the transmission power may be used. In this case, the terminal 20 determines the transmission power control of FR2 (S108), and sets the reduction width of the transmission power of FR2 to the preset reduction width. Then, the terminal 20 can continue data communication by using the transmission power reduced by the set reduction width.

In the control method 1 described above, the terminal 20 controls whether or not to reduce the transmission power of the UL signal in FR2 based on the control information on the transmission power in the LTE band and/or FR 1. By this method, even in wireless communication using FR2 for which transmission power control is not prescribed, terminal 20 can reduce interference to other devices more than in the related art by appropriately reducing transmission power.

In the above-described control method 1, the terminal 20 determines whether or not to control the transmission power in FR2 based on the value of Pmax and/or the number of Pmax. By this method, in the case where power control is desired in the LTE band and/or FR1 and not desired in FR2, the terminal 20 can perform control without performing power control in FR 2.

[ control method 2]

In the control method 2, the terminal 20 controls whether to stop communication (e.g., transmission of UL signals) in FR2 based on control information on transmission power in the LTE band and/or FR 1.

For example, receiving section 201 of terminal 20 receives control information (e.g., Pmax) related to transmission power in the LTE band and/or FR1, and control section 203 controls whether to stop communication in FR2 based on the control information. For example, the terminal 20 may stop communication in FR2 by stopping supply of power related to communication in FR 2.

Instead of stopping the communication in FR2, the terminal 20 may return the communication system (frequency band) in use to another communication system such as the LTE band and/or FR1 to continue the communication. The terminal 20 may stop the communication in FR2 after returning the communication system in use to another communication system, or may return to another communication system after stopping the communication in FR 2. Alternatively, the fallback to another communication system and the stopping of communication in FR2 may be performed simultaneously.

In the case where the terminal 20 receives Pmax, the transmission request of FR2 may also be stopped actively (independently). Alternatively, terminal 20 may notify base station 10 of the fact that the UL transmission of FR2 is stopped. In this case, the FR2 base station 10 that has received the notification may not provide the terminal 20 with the transmission opportunity in FR 2. Since the terminal 20 is not provided with a transmission opportunity in FR2, the transmission of FR2 is stopped.

For example, when the terminal 20 notifies the base station 10 that the P-max is being received, the base station 10 may not allocate the transmission permission (Grant) of FR2 to the terminal 20. In the case where no transmission permission is assigned, the terminal 20 stops transmission.

In the above example, terminal 20 stops communication in FR2 based on the presence or absence of reception of Pmax when Pmax is received, but the present disclosure is not limited to this. For example, the terminal 20 may also determine whether to stop communication in FR2 based on the value indicated by Pmax and/or the number of received Pmax.

For example, in the terminal 20, a threshold value for comparison with the value of Pmax may be set, and the stop of communication is controlled based on the result of the comparison. For example, the terminal 20 may stop the communication in FR2 when the value of Pmax is equal to or less than the threshold value; in the case where the value of Pmax is larger than the threshold value, the communication in FR2 is not stopped.

Pmax is information related to power control in the LTE band and/or FR1, but it can be assumed that power control in FR2 is also desired in an area where power control is desired in the LTE band and/or FR 1. Therefore, the terminal 20 may determine whether to stop communication in FR2, based on whether or not the value of Pmax is equal to or less than the threshold value, that is, whether or not the power to be reduced in the LTE band and/or FR1 is large.

Further, for example, the terminal 20 may also determine whether to stop communication based on the number of Pmax received at each specific time. For example, the terminal 20 may determine to stop the communication in FR2 when the number of received Pmax is equal to or greater than a specific number; when the number of Pmax is smaller than the specific number, it is determined not to stop (continue) communication.

For example, it is estimated that, when a certain number or more of base stations 10 (for example, 2 or more of base stations 10) notify Pmax, the requirement for power control in the area where the base stations 10 are installed is stricter than when less than the certain number of base stations 10 (for example, 1 of base stations 10) notify Pmax. Therefore, the terminal 20 may determine whether to stop the communication in the FR2 based on the number of received Pmax.

For example, the terminal 20 may determine whether to stop communication in FR2 based on both the value of Pmax and the number of Pmax. For example, the terminal 20 may determine to stop the communication in the FR2 when Pmax equal to or less than the threshold value is received by a certain number or more, and determine not to stop when it is not.

For example, the terminal 20 may determine whether to stop communication in FR2 immediately or stop communication after reducing the transmission power in stages, based on at least one of the value of Pmax and the number of Pmax.

The terminal 20 may determine whether or not to stop the communication in the FR2 based on other information, not only Pmax notified from the base station 10. For example, the terminal 20 may determine whether to stop communication in the FR2 based on the location information of the other device.

For example, a reference device operating in the LTE band domain and/or FR1 and informing the LTE/FR1 base station 10 of the location information may also be disposed in the protection area. Here, the set reference device supports the transmission power control of the LTE band and/or FR1 based on Pmax.

The terminal 20 receives the location information of the terminal 20 and the location information of the reference device via the LTE/FR1 base station 10. The terminal 20 may determine whether the terminal 20 exists in the protection area based on the location information of the terminal 20 and the location information of the reference device. Then, in the case of existence in the protection area, the terminal 20 may stop the communication in the FR 2.

Further, in case of receiving Pmax, the terminal 20 may estimate the distance of the base station 10 and the terminal 20 based on the reference signal from the base station 10 in the LTE band and/or FR 1.

For example, when the distance between the LTE/FR1 base station 10 and the terminal 20 is equal to or greater than a predetermined distance, the terminal 20 determined to be a protection area near the LTE/FR1 base station 10 does not stop communication in FR 2. On the other hand, when the distance is shorter than the predetermined distance, the terminal 20 stops the communication in the FR 2.

Next, an example of a flow of control by the control method 2 will be described.

Fig. 4 is a flowchart showing an example of a control flow in the control method 2 according to the present embodiment. The flowchart shown in fig. 4 starts, for example, when the terminal 20 receives Pmax from the base station 10. In fig. 4, the same processes as those in fig. 3 are denoted by the same reference numerals and the description thereof may be omitted.

When Pmax is equal to or less than the first threshold value (yes in S104), the terminal 20 determines whether or not data communication is being performed in FR2 (S105).

In a case where data communication is not being performed (no in S105), the terminal 20 stops the operation of the FR2 (S201). Then, the control flow based on the control method 2 ends.

When data communication is being performed (yes in S105), the terminal 20 determines that communication stop of the FR2 is to be performed (S202).

Then, the terminal 20 determines whether Pmax is equal to or less than the second threshold value (S203). In addition, for example, the second threshold may be equal to or lower than the first threshold used in S104.

When Pmax is equal to or lower than the second threshold value (yes in S203), the terminal 20 stops communication of the FR2 (S205). Then, the control flow based on the control method 2 ends.

When Pmax is not equal to or lower than the second threshold (no in S203), terminal 20 performs control to reduce the transmission power of FR2 in stages (S204). For example, the transmission power may be reduced in stages until data communication for a certain time (for example, a time until a certain amount of data is transmitted) elapses. Then, the terminal stops the communication of FR2 (S205), and the control flow based on control method 2 ends.

In addition, as in the control method 1, in the control method 2, one or both of the processes in S103 and S104 may not be executed in the control flow described above. In addition, as in the control method 1, in addition to the processing of S103 and S104 or instead of at least one of the processing of S103 and S104, the terminal 20 may determine whether or not to stop the communication based on the information on the position of the other device as described above.

In the control flow described above, the processing in S203 and S204 may not be executed. For example, in a case where the processes of S203 and S204 are not executed, the terminal 20 may execute the process of S205 (the process of stopping the transmission of FR2) after deciding that the transmission of FR2 is to be stopped (after the process of S202).

Further, in the above-described control flow, after stopping the communication in FR2 in S205, the terminal 20 may also fall back the communication system in use to another communication system (e.g., a communication system in LTE and/or FR1 or Wi-fi (registered trademark)).

In the control method 2 described above, the terminal 20 controls whether to stop communication (for example, transmission of an UL signal) in FR2 based on control information on transmission power in the LTE band and/or FR 1. By this method, even in wireless communication using FR2 for which transmission power control is not prescribed, terminal 20 can further reduce interference applied to other devices than in the related art by appropriately stopping communication.

In the control method 2 described above, the terminal 20 determines whether to stop the communication in FR2 based on the value of Pmax and/or the number of Pmax. By this method, in the case where power control is desired in the LTE band and/or FR1 and not desired in FR2, the terminal 20 can perform control without stopping communication in FR 2.

[ control method 3]

In the above-described control method 1 and control method 2, an example of performing control (transmission power control or stop of communication) of a communication operation when the terminal 20 performs data communication is shown. In the control method 3, for example, the terminal 20 stops a part of the process of searching for a signal in the case of searching for the base station 10 to be connected in FR 2. The process of searching for a signal may be either one or both of a process of searching for a DL signal including control information and the like from the base station 10 and a process of performing beam scanning for UL for establishing a connection with the base station 10, for example.

For example, receiving section 201 of terminal 20 receives control information (e.g., Pmax) related to transmission power in the LTE band and/or FR 1. The control unit 203 controls whether to stop the process of searching for a signal in FR2 (for example, the beam scanning process of UL in FR2 and/or the search process of DL signal in FR2) based on the control information.

For example, the terminal 20 may perform control to suppress the peak of the beam in the beam sweep of the UL instead of stopping the beam sweep of the UL.

In addition, the terminal 20 may determine whether or not to stop the process of searching for the signal in FR2 based on the value indicated by Pmax and/or the number of received Pmax.

For example, in the terminal 20, a threshold value for comparison with the value of Pmax may be set, and control is performed based on the result of the comparison. For example, the terminal 20 may stop the process of searching for the signal in FR2 when the value of Pmax is equal to or less than the threshold value; in the case where the value of Pmax is larger than the threshold value, the process of searching for a signal in FR2 is not stopped.

Pmax is information related to power control in the LTE band and/or FR1, but it is conceivable that power control in FR2 is also desired in an area where power control is desired in the LTE band and/or FR 1. Therefore, the terminal 20 may determine whether or not to stop the process of searching for the signal in FR2, depending on whether or not the value of Pmax is equal to or less than the threshold value, that is, whether or not the power to be reduced in the LTE band and/or FR1 is large.

Further, for example, the terminal 20 may also perform control based on the number of Pmax received at each specific time. For example, the terminal 20 may stop the process of searching for the signal in FR2 when the number of received Pmax is equal to or greater than a certain number; in the case where the number of Pmax is smaller than the specific number, the process of searching for a signal in FR2 is not stopped.

For example, it is estimated that, when a certain number or more of base stations 10 (for example, 2 or more of base stations 10) notify Pmax, the requirement for power control in the area where the base stations 10 are installed is stricter than when less than the certain number of base stations 10 (for example, 1 of base stations 10) notify Pmax. Therefore, the terminal 20 may determine whether or not to stop the process of searching for the signal in FR2, based on the number of received Pmax.

For example, the terminal 20 may determine whether or not to stop the process of searching for the signal in FR2 based on both the value of Pmax and the number of Pmax. For example, the terminal 20 may determine to stop the process of searching for the signal in FR2 when Pmax equal to or less than the threshold value is received by a certain number or more, and may determine not to stop when Pmax is not received by a certain number or more.

Next, an example of a flow of control by the control method 3 will be described.

Fig. 5 is a flowchart showing an example of a control flow of the control method 3 according to the present embodiment. The flowchart shown in fig. 5 starts, for example, when the terminal 20 receives Pmax from the base station 10. In fig. 5, the same processes as those in fig. 3 are denoted by the same reference numerals and the description thereof may be omitted.

When Pmax is equal to or less than the first threshold value (yes in S104), the terminal 20 determines whether or not beam scanning is being performed in FR2 (S301).

When the beam scanning is being performed in FR2 (yes in S301), the terminal 20 determines whether or not Pmax is equal to or less than the second threshold value (S302).

When Pmax is equal to or lower than the second threshold value (yes in S302), the terminal 20 stops beam scanning in FR2 (S303).

Then, the terminal 20 interrupts (or stops) transmission of an SRS (Sounding Reference Signal) notifying beam information (S304).

Then, the terminal 20 releases the setting based on Pmax and releases the stop of the communication operation in FR2 (S305). Then, the terminal 20 executes the process of S307.

If beam scanning is not being performed in FR2 (no in S301), terminal 20 does not perform DL signal search and/or UL beam scanning (S306). Then, the terminal 20 executes the process of S307.

If Pmax is not equal to or less than the second threshold (no in S302), or if the beam scanning in FR2 is stopped after the processing in S305 or S306, the terminal 20 releases the stopping of the beam scanning in FR2 (S307). Then, the control flow based on the control method 3 ends.

In addition, as in the control method 1, in the control method 3, one or both of the processes in S103 and S104 may not be executed in the control flow described above.

In the control flow described above, the process of S302 may not be executed. For example, in a case where the processing of S302 is not performed, the terminal 20 may skip S302 and perform the processing of S303 (processing of stopping beam scanning in FR2) in a case where beam scanning is being performed in FR2 (yes in S301).

In the control flow described above, the process of S307 may not be executed. For example, the terminal 20 may continue the stopping of the beam scanning without performing the process of S307.

In the control flow described above, the process of S305 may be executed based on Pmax. For example, in a case where the value of Pmax received after a certain timing is larger than a threshold value, and/or in a case where the number of Pmax is smaller than a certain number, the terminal 20 may release the setting based on Pmax, and release the stop of the communication operation in FR 2. The "specific timing" may correspond to the timing at which the terminal 20 receives Pmax in the process of S101, or may correspond to the timing at which the terminal 20 stops beam scanning in FR2 in the process of S303.

In the control flow described above, the process of S307 may be executed based on Pmax. For example, in a case where the value of Pmax received after a certain timing is larger than a threshold value, and/or in a case where the number of Pmax is smaller than a certain number, the terminal 20 may release the stop of beam scanning in FR 2. The "specific timing" may correspond to, for example, the timing at which the terminal 20 receives Pmax in the process of S101, or may correspond to the timing at which the terminal 20 stops beam scanning in FR2 in the process of S303.

For example, when the terminal 20 leaves the area of the base station 10 where Pmax is set, the terminal 20 may cancel the stop of the communication operation in FR2, for example, the stop of the beam scanning in FR 2. Therefore, the determination as to whether or not to release the stop of the communication operation in FR2, for example, the stop of the beam scanning in FR2, can be made based on the value of the received Pmax and the number of the received Pmax.

When the terminal 20 leaves the area of the base station 10 where Pmax is set, the control of the other communication operation in FR2 may be canceled. For example, when the terminal 20 leaves the area of the base station 10 where Pmax is set, the terminal 20 may cancel the reduction of the transmission power in FR2 by the control method 1. Alternatively, when the terminal 20 leaves the area of the base station 10 where Pmax is set, the terminal 20 may cancel the stop of the communication in FR2 by the control method 2. The determination as to whether or not the area of the base station 10 in which Pmax is set is left can be made based on the value of Pmax received and the number of Pmax received.

In the control method 3 described above, the terminal 20 controls whether or not to stop the process of searching for a signal in FR2 based on the control information on the transmission power in the LTE band and/or FR 1. By this method, even in wireless communication using FR2 for which transmission power control is not prescribed, terminal 20 can reduce interference to other devices more than in the related art by appropriately stopping the processing of the search signal.

In the control method 3 described above, the terminal 20 determines whether or not to stop the process of searching for a signal in FR2, based on the value of Pmax and/or the number of Pmax. By this method, in the case where power control is desired in the LTE band and/or FR1 and not desired in FR2, control can be performed without stopping the process of searching for a signal in FR 2.

In addition, in control method 3 described above, by stopping the process of searching for a signal in FR2, power consumption in terminal 20 can be saved.

The terminal 20 of the present embodiment may use any one of the control methods 1 to 3 described above, or may use a combination of 2 or more.

For example, in a case where data communication is being implemented, the terminal 20 may perform control of reducing the transmission power in FR2 based on control method 1. Further, when data communication is not being carried out, the terminal 20 may perform control of stopping the process of searching for a signal in FR2 based on the control method 3 or perform control of stopping communication in FR2 based on the control method 2.

Alternatively, in the case where data communication is being conducted, the terminal 20 may determine whether the data communication should be continued. Then, in the case where the data communication is to be continued, the terminal 20 may perform control of reducing the transmission power in the FR2 to continue the data communication. On the other hand, the terminal 20 may perform control of stopping communication in the FR2 without continuing data communication. In the case where the communication in FR2 is to be stopped, the terminal 20 can fall back to another communication system (e.g., a communication system in LTE and/or FR1 or Wi-fi (registered trademark)).

For example, as to whether data communication should be continued, a determination may be made based on the value of Pmax and/or the number of Pmax. For example, in the case where Pmax is equal to or less than a threshold value and/or the number of Pmax is equal to or more than a certain number, the terminal 20 may determine that data communication should not be continued; in the case where Pmax is greater than the threshold and/or the number of Pmax is less than a certain number, the terminal 20 can determine that data communication should be continued.

Alternatively, the terminal 20 may perform control of stopping the processing of searching for the signal in FR2 and/or control of stopping the communication in FR2, regardless of whether or not data communication is being performed. In this case, as to whether or not the control of stopping the process of searching for the signal in FR2 and/or the control of stopping the communication in FR2 are performed, it can be determined based on the value of Pmax and/or the number of Pmax. For example, when Pmax is equal to or less than a threshold value and/or the number of Pmax is equal to or more than a certain number, the terminal 20 may determine to perform control to stop processing for searching for a signal in FR2 and/or control to stop communication in FR 2.

Note that "Pmax" in the above-described embodiments is an example of control information related to transmission power in the LTE band and/or FR1, and the present disclosure is not limited thereto. The control information related to the transmission power in the LTE band and/or FR1 may be replaced with other terms.

In the above-described embodiment, the threshold values to be compared with the value indicated by Pmax may be different from each other. For example, the threshold values may be different from each other in each of the above-described control methods 1 to 3. In the above-described embodiment, the specific numbers to be compared with the number of Pmax may be different from each other. For example, the specific number may be different from each other in each of the above-described control methods 1 to 3.

In the above-described embodiment, the "reception of Pmax by the terminal 20" may correspond to, for example, "the reception of a notification of Pmax by the terminal 20" or "the detection of Pmax by the terminal 20". Further, "detect" may be replaced with other expressions such as "detect", "identify", "determine", and the like. Further, the "the terminal 20 does not receive Pmax" may correspond to "the number of Pmax received by the terminal 20 is zero".

(hardware construction)

The block diagrams used in the description of the above embodiments represent blocks in functional units. These functional blocks (structural units) are realized by any combination of at least one of hardware and software. Note that the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by using 1 device physically or logically combined, or by directly or indirectly (for example, by using a wired or wireless connection) connecting 2 or more devices physically or logically separated and using these plural devices. The functional blocks may be implemented by combining software in the above-described 1 device or a plurality of devices.

The functions include judgment, determination, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, consideration, broadcast (broadcasting), notification (notification), communication (communicating), forwarding (forwarding), setting (configuring), reconfiguration (resetting), allocation (allocating), mapping (mapping), assignment (allocating), and the like, but are not limited thereto. For example, a function block (a structural unit) that enables transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like. As described above, the implementation method is not particularly limited in each case.

For example, a base station, a terminal, or the like in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 6 is a diagram showing an example of hardware configurations of a base station and a terminal according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In the following description, terms such as "means" and "apparatus" may be replaced with circuits, devices, units, and the like. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the illustrated devices, or may be configured to exclude some of the devices.

Each function of the base station 10 and the terminal 20 is realized by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, and performing an operation by the processor 1001 to control communication by the communication device 1004 or to control at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the control unit 103, the control unit 203, and the like described above may be implemented by the processor 1001.

The processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with the read program. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 103 of the base station 10 or the control unit 203 of the terminal 20 may be realized by a control program stored in the memory 1002 and operated in the processor 1001, and may be similarly realized with respect to other functional blocks. Although the various processes described above are described as being executed by one processor 1001, they may be executed simultaneously or sequentially by 2 or more processors 1001. The processor 1001 may also be implemented by 1 or more chips. In addition, the program may be transmitted from a network via an electric communication line.

The Memory 1002 is a computer-readable recording medium, and may be configured by at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable EPROM), a RAM (Random Access Memory), and the like. The memory 1002 may be referred to as a register, cache, main memory (primary storage), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to one embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and may be configured with at least one of an optical disk such as a CD-ROM (Compact Disc read only memory), a hard disk drive, a flexible disk, an optical disk (e.g., a Compact disk, a digital versatile Disc, a Blu-ray (registered trademark) Disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) Disc, a magnetic stripe, and the like. The storage 1003 may be referred to as a secondary storage device. For example, the storage medium may be a database including at least one of the memory 1002 and the storage 1003, a server, or other appropriate medium.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like, for example. Communication apparatus 1004 may be configured to include, for example, a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, in order to realize at least one of Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD). For example, the transmitting unit 101, the receiving unit 102, the receiving unit 201, the transmitting unit 202, and the like described above can be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, or the like) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

The processor 1001 and the memory 1002 are connected to each other via a bus 1007 for communicating information. The bus 1007 may be formed using a single bus, or may be formed using a bus different from one device to another.

Each of the base station 10 and the Device 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may also be implemented using at least one of these hardware.

(information Notification, Signaling)

The information notification is not limited to the embodiment described in the present disclosure, and may be performed by other methods. For example, the Information may be notified by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control)) signaling, MAC (Medium Access Control) signaling, broadcast Information (MIB (Master Information Block)), SIB (System Information Block), other signals, or a combination thereof).

(application System)

The aspects/embodiments described in the present disclosure may also be applied to LTE (Long Term Evolution), LTE-a (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (fourth generation mobile communication system), 5G (fifth generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-wide band), Bluetooth (registered trademark), a system using another appropriate system, and a next generation system expanded based on these. Further, a plurality of systems may be applied in combination (for example, a combination of 5G and at least one of LTE and LTE-a).

(treatment Processes, etc.)

The order of processing procedures, sequences, flows, and the like of the respective modes/embodiments described in the present disclosure may be changed as long as they are not contradictory. For example, with respect to the methods described in this disclosure, elements of the various steps are suggested using an illustrative order and are not limited to the particular order presented.

(operation of base station)

In the present disclosure, it is assumed that a specific operation performed by the base station is sometimes performed by its upper node (upper node) depending on the case. Obviously, in a network configured by one or more network nodes (network nodes) having a base station, various operations performed for communication with a terminal can be performed by at least 1 of the base station and other network nodes (for example, an MME, an S-GW, or the like may be considered, but not limited thereto) other than the base station. In the above, the case where one network node is used other than the base station is exemplified, however, a combination of a plurality of other network nodes (e.g., MME and S-GW) is also possible.

(direction of input/output)

Information and the like (items referred to as "information and signal") can be output from a higher layer (upper layer) (or from a lower layer (lower layer)) to a lower layer (or higher layer). Or may be input and output via a plurality of network nodes.

(processing of input/output information and the like)

The information to be input and output may be stored in a specific location (for example, a memory) or may be managed using a management table. Information and the like to be input and output can be overwritten, updated, or written. The output information and the like may be deleted. The inputted information and the like may be transmitted to other devices.

(determination method)

The determination may be performed by a value (0 or 1) expressed by 1 bit, by a true or false value (boolean value) true or false, or by a comparison of values (for example, comparison with a specific value).

(software)

Software shall be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects (objects), executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names.

In addition, software, instructions, information, and the like may also be transmitted or received via a transmission medium. For example, in the case where software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of transmission medium.

(information, Signal)

Information, signals, etc. described in this disclosure may also be represented using one of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

In addition, terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). Further, the signal may also be a message. Further, a Component Carrier (CC) may also be referred to as a Carrier frequency, a cell, a frequency Carrier, and the like.

("System", "network")

The terms "system" and "network" as used in this disclosure may be used interchangeably.

(name of parameter, channel)

In addition, information, parameters, and the like described in the present disclosure may be expressed by absolute values, may be expressed by relative values to specific values, and may be expressed by other corresponding information. For example, the radio resource may also be indicated by an index.

The names used for the above parameters are in no way limiting. Further, there are also cases where the mathematical expressions using these parameters and the like are different from those explicitly disclosed in the present disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and thus the various names assigned to these various channels and information elements are not limiting names in any respect.

(base station (radio base station))

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "fixed Station", "NodeB", "enodeb (enb)", "gnnodeb (gnb)", "access Point", "transmission Point", "Reception Point", "transmission/Reception Point", "cell", "sector", "cell group", "carrier", "component carrier" and the like can be used interchangeably. A base station is sometimes also referred to by terms such as macrocell, smallcell, femtocell, picocell, and the like.

A base station can accommodate one or more (e.g., three) cells. In the case where a base station accommodates a plurality of cells, the coverage area of the base station as a whole can be divided into a plurality of smaller areas, and each smaller area can also provide a communication service through a base station subsystem (e.g., an indoor small base station (RRH): Remote Radio Head) — "cell" or "sector" which is a term referring to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that performs a communication service in the coverage area.

(terminal)

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE)", and "terminal" can be used interchangeably.

A mobile station is sometimes referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communications device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or several other appropriate terms.

(base station/mobile station)

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving body may be a vehicle (e.g., an automobile, an airplane, etc.), may be a moving body that moves in an unmanned manner (e.g., an unmanned aerial vehicle, an autonomous automobile, etc.), or may be a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

In addition, the base station in the present disclosure may also be replaced with a user terminal. For example, the aspects and embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, also referred to as D2D (Device-to-Device), V2X (Vehicle-to-event), and the like). In this case, the terminal 20 may have the function of the base station 10. Terms such as "upstream" and "downstream" may be replaced with terms corresponding to inter-terminal communication (e.g., "side"). For example, the uplink channel, the downlink channel, and the like may be replaced with the side channel.

Likewise, a terminal in the present disclosure may also be replaced with a base station. In this case, the base station 10 may have the functions of the terminal 20.

(meanings and explanations of terms)

The terms "determining" and "deciding" used in the present disclosure sometimes include various operations. The terms "determining" and "decision" may include, for example, determining "and" deciding "on a decision (judging), calculation (calculating), processing (processing), derivation (deriving), investigation (investigating), search (looking up), search (retrieving), inquiry (querying)) (e.g., a search in a table, database, or other data structure), confirmation (authenticating), and the like. The terms "determining" and "determining" may include determining "and" determining "as to whether reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), access (e.g., access to data in a memory), and the like have been performed. The terms "determining" and "determining" can include determining and determining that a solution (resolving), a selection (selecting), a selection (sounding), a building (establishing), a comparison (comparing), and the like are performed. That is, "judgment" and "determination" may include "judgment" and "determination" regarding an arbitrary operation. The "determination (decision)" may be replaced with "assumption", "desire", "treating", and the like.

The terms "connected", "coupled" or all variations thereof mean that all connections or couplings, direct or indirect, between 2 or more elements, and can include 1 or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may also be replaced with "accessed". As used in this disclosure, 2 elements are "connected" or "joined" to each other using at least one of one or more wires, cables, and printed electrical connections, and as a few non-limiting and non-exhaustive examples, are "connected" or "joined" to each other using electromagnetic energy or the like having wavelengths in the wireless frequency domain, the microwave region, and the optical (both visible and non-visible) region.

The Reference Signal can also be referred to simply as RS (Reference Signal) and, depending on the standard of application, may also be referred to as Pilot (Pilot) or the like.

The term "based on" used in the present disclosure does not mean "based only on" unless otherwise noted. In other words, the expression "based on" means both "based only on" and "based at least on".

Any reference to elements using the designations "first", "second", etc. does not define the quantity or order of those elements as a whole. These designations can be used in the present disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to first and second elements does not mean that only two elements can be employed, or that in some form the first element must precede the second element.

The "unit" in the configuration of each device described above may be replaced with "means", "circuit", "device", or the like.

In the present disclosure, when the terms "including", and variations thereof are used, these terms mean an inclusive meaning as with the term "comprising". Further, the term "or" as used in this disclosure is not meant to refer to a logical exclusive or.

A radio frame may also be made up of one or more frames in the time domain. In the time domain, one or more individual frames may also be referred to as subframes. Further, a subframe may also be composed of one or more slots in the time domain. The subframe may also be a fixed time length (e.g., 1ms) independent of a parameter set (numerology).

The parameter set may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set may indicate at least one of a SubCarrier Spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a Transmission Time Interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by the transmitter/receiver in the frequency domain, a specific windowing process performed by the transmitter/receiver in the Time domain, and the like.

The slot may be formed of one or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, or the like). The time slot may also be a time unit based on a parameter set.

A timeslot may also contain multiple mini-slots. Each mini-slot may also be made up of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be made up of fewer symbols than the number of slots. The PDSCH (or PUSCH) transmitted in a time unit larger than the mini slot may also be referred to as PDSCH (or PUSCH) mapping type a. The PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (or PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may also use other names respectively corresponding thereto.

For example, 1 subframe may also be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may also be referred to as TTIs, and 1 slot or 1 mini-slot may also be referred to as TTIs. That is, at least one of the subframe and TTI may be a subframe (1ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1 to 13 symbols), or may be a period longer than 1 ms. The unit indicating TTI may be referred to as a slot, a mini slot, or the like, and is not referred to as a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidth, transmission power, and the like that can be used by each user terminal) to each user terminal in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, code word, or the like, or may be a processing unit of scheduling, link adaptation, or the like. In addition, when a TTI is given, a time interval (for example, the number of symbols) to which a transport block, a code block, a codeword, and the like are actually mapped may be shorter than the TTI.

In addition, when 1 slot or 1 mini-slot is referred to as TTI, 1 TTI or more (i.e., 1 slot or more or 1 mini-slot) may be the minimum time unit for scheduling. The number of slots (the number of mini-slots) constituting the minimum time unit of the schedule may be controlled.

The TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in LTE rel.8-12), a normal (normal) TTI, a long (long) TTI, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length smaller than the long TTI and equal to or longer than 1 ms.

A Resource Block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more continuous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may also be decided based on the parameter set.

In addition, an RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. Each of 1 TTI and 1 subframe may be configured by one or more resource blocks.

In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB peers, and so on.

In addition, a Resource block may also be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

The Bandwidth Part (BWP: Bandwidth Part) (may also be referred to as a partial Bandwidth) may indicate a subset of consecutive common RBs (common resource blocks) for a certain parameter set in a certain carrier. Here, the common RB may also be determined by an index of an RB with the common reference point of the carrier as a reference. PRB is defined in a certain BWP and may also be numbered within the BWP.

The BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). One or more BWPs may be set for the UE within 1 carrier.

At least 1 of the set BWPs may be active, and the UE may or may not be supposed to transmit and receive a specific signal/channel other than the active BWPs. In addition, "cell", "carrier", and the like in the present disclosure may also be replaced with "BWP".

The above-described structures of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and other configurations may be variously modified.

In the present disclosure, in the case where articles such as "a", "an", and "the" in english are added by translation, a case where nouns after these articles are plural forms can also be included in the present disclosure.

In the present disclosure, the term "a and B are different" may also mean "a and B are different from each other". In addition, the term also means "a and B are different from C, respectively". The terms "separate", "combine", and the like are also to be construed as similar to "different".

(variations of the embodiment, etc.)

The aspects and embodiments described in the present disclosure may be used alone, may be used in combination, or may be switched to use with execution. Note that the notification of the specific information (for example, the notification of "X") is not limited to be explicitly performed, and may be performed implicitly (for example, the notification of the specific information is not performed).

While the present disclosure has been described in detail, it will be apparent to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure determined based on the description of the claims. Accordingly, the description of the present disclosure is for the purpose of illustration and is not intended to be in any way limiting.

Industrial applicability of the invention

An aspect of the present disclosure is useful for a mobile communication system.

Description of the reference symbols

10 base station

20 terminal

101. 202 sending unit

102. 201 receiving unit

103. 203 control unit.

Claims

1. A terminal is provided with:

a reception unit that receives control information related to transmission power in a first frequency band; and

a control unit that controls a communication operation in the second frequency band based on the control information.

2. The terminal of claim 1, wherein,

the control unit performs control to reduce the transmission power of an uplink signal in the communication operation, in a case where a value indicated by the control information is a threshold value or less.

3. The terminal of claim 1, wherein,

the control unit performs control to reduce the transmission power of an uplink signal in the communication operation, in a case where the number of receptions per specific time of the control information is equal to or greater than a threshold value.

4. The terminal of claim 1, wherein,

the control unit performs control of reducing transmission power of an uplink signal in the communication operation in a case where the terminal is located in a specific area.

5. The terminal of claim 2, wherein,

the control of reducing the transmission power of the uplink signal in the second frequency band includes control of a transmission beam pattern of the uplink signal.

6. A wireless communication control method, wherein,

receiving control information related to transmission power in a first frequency band; and

controlling a communication operation in the second frequency band based on the control information.