WO2019202649A1

WO2019202649A1 - User device and base station

Info

Publication number: WO2019202649A1
Application number: PCT/JP2018/015771
Authority: WO
Inventors: 高橋　秀明; 大將梅田; 洋介佐野
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2018-04-16
Filing date: 2018-04-16
Publication date: 2019-10-24

Abstract

A user device having: a transmission unit that supports a first power class in a given frequency band; a reception unit for receiving a wireless signal transmitted by a base station; and a control unit that, when the reception unit has received a wireless signal including information that indicates a condition for a specific absorption rate to be satisfied by the user device in a frequency band having a second power class lower than the first power class as a default power class, determines the maximum transmitted power of the transmission unit so as to satisfy the specific absorption rate to be satisfied by the user device.

Description

User equipment and base station

The present invention relates to a user apparatus and a base station.

In 3GPP (Third Generation Partnership Project), specifications regarding a transmission power control method in a user apparatus that supports a power class having a higher maximum transmission power than the power class defined by default are being promoted (for example, non-patent) Reference 1).

In the technology disclosed in Non-Patent Document 1, when a frequency band is a TDD (Time Division Division Duplex) band and 50% or more slots in a radio frame are uplink transmissions, the user apparatus has a maximum transmission power. A higher high power class cannot be used.

However, actually, even when the frequency band is a TDD band and 50% or more slots in the radio frame are uplink transmissions, for example, the frequency band, the specific absorption rate of the user equipment, the country, High power class may be available depending on the region.

As described above, in the conventional technology, there is a case where the high power class supported by the user apparatus cannot be efficiently used in a frequency band having a default power class lower than the high power class supported by the user apparatus.

Embodiments of the present invention have been made in view of the above problems, and in a frequency band having a default power class lower than the high power class supported by the user apparatus, the high power class supported by the user apparatus is determined. Make it available more efficiently.

In order to solve the above problem, a user apparatus according to an aspect of the present invention includes a transmission unit that supports a first power class in a certain frequency band, a reception unit that receives a radio signal transmitted by a base station, and In the frequency band having a second power class lower than one power class as a default power class, the receiving unit receives the radio signal including information indicating a specific absorption rate condition to be satisfied by the user apparatus And a control unit that determines a maximum transmission power of the transmission unit so as to satisfy a specific absorption rate that should be satisfied by the user apparatus.

According to the embodiment of the present invention, the high power class supported by the user apparatus can be used more efficiently in a frequency band having a default power class lower than the high power class supported by the user apparatus.

1 is a schematic diagram illustrating a wireless communication system according to one embodiment. It is a block diagram which shows the function structure of the user apparatus by one Example. It is a block diagram which shows the function structure of the base station by one Example. It is a flowchart which shows the example of the determination process of the maximum transmission power by one Example. It is a figure for demonstrating RequiredSAR by one Example. It is a sequence diagram which shows the example of the initial access process by one Example. It is a sequence diagram which shows the example of the hand-over process by one Example. It is a figure which shows the example (1) of the specification change by one Example. It is a figure which shows the example (2) of the specification change by one Example. It is a figure which shows the example (3) of the specification change by one Example. It is a block diagram which shows the hardware constitutions of the user apparatus and base station by one Example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<System configuration>
First, a radio communication system according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention. As illustrated in FIG. 1, the wireless communication system 10 includes a user device 100 and a base station 200.

The wireless communication system 10 may typically be a wireless communication system compliant with a standard by 3GPP (Third Generation Partnership Project) such as LTE system, LTE-Advanced system, or 5G system. However, the radio communication system 10 according to the present invention is not limited to this, and may be, for example, UMTS (Universal Mobile Telecommunications System), UMTS enhancement, LTE single-cluster, LTE multi-cluster, UL inter- It may be a variation of the LTE system, such as band CA, UL intra-band contiguous CA, UL intra-band non-continuous CA, Dual Connectivity. In the illustrated embodiment, only one base station 200 is shown, but a number of base stations 200 are arranged to cover the service area of the wireless communication system 10.

The user apparatus 100 performs wireless communication with the base station 200 via a cell or a frequency band provided by the base station 200 according to 3GPP standards such as LTE, LTE-Advanced and / or 5G. Typically, the user apparatus 100 may be any appropriate information processing apparatus having a wireless communication function such as a smartphone, a mobile phone, a tablet, a mobile router, and a wearable terminal as illustrated.

The base station 200 is wirelessly connected to the user apparatus 100 via a cell or a frequency band according to 3GPP standards such as LTE, LTE-Advanced and / or 5G, and is connected to a higher level connected to a core network (not shown). The downlink (DL) packet received from the station and / or the server is transmitted to the user apparatus 100, and the uplink (UL) packet received from the user apparatus 100 is transmitted to the server.

In the above configuration, the base station 200 sets a power class (hereinafter referred to as a second power class) lower than a high power class (hereinafter referred to as a first power class) supported by the user apparatus 100 as a default power class. System information is transmitted in the frequency band possessed as Further, the system information transmitted by the base station 200 indicates “P-Max”, which is information indicating the maximum transmission power applied to the frequency band, and a specific absorption rate (SAR) condition to be satisfied by the user apparatus. Information “Required SAR” is included.

Specific Absorption Rate (SAR) is the amount of energy absorbed per unit time by a tissue of unit mass when a human body is exposed to radio waves. As a standard of the specific absorption rate (hereinafter referred to as SAR) regarding the user apparatus 100, for example, a local SAR is used, and the standard value is defined.

When receiving the system information including the above-described P-Max and Required SAR from the base station 200, the user apparatus 100 performs maximum transmission so as to satisfy the SAR conditions indicated by the Required SAR when accessing the base station 200. Determine the power.

For example, the user apparatus 100 receives from the base station 200 system information including P-Max indicating the maximum transmission power of the first power class and Required SAR indicating the SAR conditions to be satisfied by the user apparatus. To do. In addition, it is assumed that the user device 100 stores the SAR characteristics (capability) for each frequency band of the user device 100 in advance in the storage unit as a part of the terminal capability information, for example.

At this time, the user apparatus 100 determines whether or not the SAR characteristic of the user apparatus 100 in the frequency band satisfies the SAR condition indicated by the Required SAR included in the information in the received system. Further, when the SAR characteristic of the user apparatus 100 satisfies the SAR condition indicated by the Required SAR, the user apparatus 100 performs the maximum transmission of the first power class according to the transmission regulations of the first power class in the frequency band. The power is determined as the maximum transmission power of the user apparatus 100.

On the other hand, when the SAR characteristic of the user apparatus 100 does not satisfy the condition indicated by the Required SAR, the user apparatus 100 sets the maximum transmission power of the default power class according to the transmission rule of the default power class in the frequency band. A maximum transmission power of 100 is determined.

In addition, when the received system information includes P-Max indicating the maximum transmission power of the first power class and does not include Required SAR, the user apparatus 100 defines transmission specifications for the first power class in the frequency band. Accordingly, the maximum transmission power of the first power class is determined as the maximum transmission power of the user apparatus 100.

The transmission regulations for each power class of the frequency band include, for example, adjacent channel leakage power ratio (ACLR: AdjacentjaChannel Ratio), adjacent channel sensitivity (ACS: Adjacent Channel Selectivity), and reference sensitivity power level (REFSENS: Reference). Sensitivity (Power Level), spectrum emission mask (SEM: Spectrum Emission Mask), maximum power reduction value (MPR: Maximum Power Reduction), maximum transmission power, etc. are included (Non-patent Document 1).

With the above processing, for example, the user apparatus 100 can satisfy the requirement for Required SAR even when the frequency band is a TDD band and 50% or more slots in a radio frame are uplink transmissions. A first power class can be utilized.

Therefore, according to the present embodiment, the high power class supported by the user apparatus 100 can be used more efficiently in a frequency band having a default power class lower than the high power class supported by the user apparatus 100.

<Functional configuration>
Subsequently, functional configurations of the user apparatus 100 and the base station 200 according to an embodiment of the present invention will be described.

(Functional configuration of user equipment)
FIG. 2 is a block diagram illustrating a functional configuration of a user apparatus according to an embodiment of the present invention. As illustrated in FIG. 2, the user device 100 includes a transmission unit 110, a reception unit 120, a control unit 130, a storage unit 140, and the like.

The transmission unit 110 transmits a radio signal to the base station 200. For example, the transmission unit 110 transmits various radio signals such as an uplink control channel and an uplink data channel to the base station 200. In addition, the transmission unit 110 supports a first power class having a maximum transmission power larger than a default power class (second power class) in a certain frequency band.

The receiving unit 120 receives a radio signal transmitted from the base station 200. For example, the receiving unit 120 receives various radio signals such as a downlink control channel and a downlink data channel transmitted from the base station 200.

When the control unit 130 receives system information including the above-described P-Max and Required SAR from the base station 200 in the frequency band supporting the above-described first power class, the control unit 130 indicates the SAR indicated by Required SAR. The maximum transmission power of the transmission unit 110 is determined so as to satisfy the condition.

For example, in a frequency band in which the receiving unit 120 has a second power class lower than the first power class as a default power class, a system including P-Max indicating the maximum transmission power of the first power class and RequiredSAR Assume that information is received.

At this time, the control unit 130 determines whether or not the SAR characteristics of the user apparatus 100 in the frequency band stored in advance in the storage unit 140 satisfy the condition indicated by the Required SAR. In addition, when the SAR characteristic of the user apparatus 100 satisfies the SAR condition indicated by the Required SAR, the control unit 130 increases the maximum transmission power of the first power class according to the transmission rule of the first power class in the frequency band. The maximum transmission power of the user apparatus 100 is determined.

On the other hand, when the SAR characteristic of the user apparatus 100 does not satisfy the SAR conditions indicated by the Required SAR, the control unit 130 determines the maximum transmission power of the default power class according to the transmission rule of the default power class in the frequency band. A maximum transmission power of 100 is determined.

In addition, when the received system information includes P-Max indicating the maximum transmission power of the first power class and does not include Required SAR, the control unit 130 defines transmission specifications for the first power class in the frequency band. Accordingly, the maximum transmission power of the first power class is determined as the maximum transmission power of the user apparatus 100. An example of a specific process performed by the control unit 130 will be described in detail later.

The storage unit 140 stores in advance information such as the power class supported by the user apparatus 100 in each frequency band, the SAR characteristics in each frequency band, and the like.

(Functional configuration of base station)
FIG. 3 is a block diagram showing a functional configuration of the base station according to one embodiment of the present invention. As illustrated in FIG. 3, the base station 200 includes an information transmission unit 210, a connection control unit 220, and the like.

The information transmission unit 210 transmits system information, for example. This system information includes, for example, P-Max, which is information indicating the maximum transmission power applied in the frequency band provided by the base station 200, Required SAR, which is information indicating the SAR conditions that the user apparatus 100 should satisfy. . For example, the information transmission unit 210 periodically broadcasts P-Max and RequiredSAR values applied in the frequency band using SystemInformationBlockType1 (hereinafter referred to as SIB1).

The connection control unit 220 controls wireless connection with the user device 100. For example, when the RA preamble is received from the user apparatus 100, the connection control unit 220 transmits an RA response to the user apparatus 100 and establishes a wireless connection or RRC connection with the user apparatus 100. After establishing the wireless connection, the connection control unit 220 manages the wireless connection with the user apparatus 100 such as mobility control, and also transmits information such as P-Max and Required SAR applied in the frequency band to the user apparatus 100 by individual signaling. Notice.

<Process flow>
Next, the flow of processing according to an embodiment of the present invention will be described. As described above, the user apparatus 100 transmits the transmission power when accessing the base station 200 according to the maximum transmission power (P-Max) notified from the base station 200 and the SAR conditions (Required SAR) that the user apparatus 100 should satisfy. To control.

First, the determination process of the maximum transmission power by the user apparatus 100 will be described with reference to FIG.

(Maximum transmission power determination process)
FIG. 4 is a flowchart illustrating an example of the maximum transmission power determination process according to an embodiment. This process shows an example of the maximum transmission power determination process executed by the user apparatus 100 in the frequency band having the second power class lower than the first power class supported by the user apparatus 100 as the default power class. Yes. This process is executed, for example, when the user apparatus 100 transitions from the idle state to the connected state, or when a handover is performed.

In step S1, the control unit 130 of the user apparatus 100 determines whether or not P-Max is provided from the base station 200. For example, the control unit 130 determines that the P-Max is provided from the base station 200 when the system information (SIB1) received by the receiving unit 120 or the P-MAX is included in the handover instruction or the like.

When P-Max is provided from the base station 200, the control unit 130 shifts the process to step S3. On the other hand, if P-Max is not provided from the base station 200, the process proceeds to step S2.

When the process proceeds to step S2, the control unit 130 of the user apparatus 100 determines the maximum transmission power of the default power class in the frequency band as the maximum transmission power of the user apparatus 100.

In step S3, the control unit 130 of the user apparatus 100 determines whether or not the provided P-Max is set to a value higher than the maximum transmission power of the default power class.

When P-Max is set to a value higher than the maximum transmission power of the default power class, the control unit 130 shifts the process to step S4. On the other hand, when P-Max is not set to a value higher than the maximum transmission power of the default power class, the control unit 130 shifts the process to step S2.

When the process proceeds to step S4, the control unit 130 of the user apparatus 100 determines whether or not the Required SAR is provided from the base station 200. For example, the control unit 130 determines that the required SAR is provided from the base station 200 when the required SAR is included in the system information (SIB1) received by the receiving unit 120, the handover instruction, or the like.

As an example, RequiredSAR is represented by an index (Index in IE RequiredSAR) as shown in FIG.

FIG. 5 is a diagram for explaining RequiredSAR according to an embodiment. In the example of FIG. 5, when the index “1” is specified for the Required SAR in the band X, it is indicated that the SAR condition to be satisfied by the user apparatus 100 is “60% for 1.6 W / kg”. Yes. On the other hand, when the index “2” is specified for the Required SAR in the band X, it is indicated that the SAR condition to be satisfied by the user apparatus 100 is “80% for 1.6 W / kg”. Thus, in the present embodiment, different required SARs can be notified to the user apparatus 100 even in the same frequency band (for example, band X). Thereby, for example, the maximum transmission power can be controlled based on different standards depending on the country, the region, and the like.

For example, when band X is a TDD band and 60% of slots in a radio frame are operated in uplink in a certain area A, the technology disclosed in Non-Patent Document 1 uses the user apparatus 100 as the first The power class cannot be used.

On the other hand, in this embodiment, when the index “1” is specified for the Required SAR in the band X in the region A and the user apparatus 100 has the SAR characteristic of “60% for 1.6 W / kg” or more, the user The apparatus 100 can utilize the first power class.

Further, in the example of FIG. 5, when the index “1” is specified in the Required SAR in the band Y, the SAR condition that the user apparatus 100 should satisfy is “80% for 2 W / kg”. Yes. As described above, in the present embodiment, it is possible to notify the user apparatus 100 of a different required SAR for each frequency band.

Here, it returns to FIG. 4 and continues description of a flowchart.

In step S4, when Required SAR is provided from the base station 200, the control unit 130 of the user apparatus 100 shifts the processing to step S5. On the other hand, when the Required SAR is not provided from the base station 200, the control unit 130 of the user apparatus 100 shifts the process to step S6.

When the process proceeds to step S5, the control unit 130 of the user apparatus 100 determines whether the SAR characteristics of the user apparatus 100 in the frequency band satisfy the SAR condition indicated by the Required SAR provided from the base station 200. To do.

As described above, the storage unit 140 of the user device 100 stores the SAR characteristics in each frequency band of the user device 100 in advance. Therefore, the control unit 130 acquires, from the storage unit 140, the SAR characteristic of the user apparatus 100 corresponding to the frequency band, and compares the SAR condition indicated by the Required SAR with the SAR condition indicated by the Required SAR. Can be determined.

When the SAR characteristic of the user apparatus 100 satisfies the SAR condition indicated by the Required SAR provided from the base station 200, the control unit 130 shifts the process to step S6. On the other hand, when the SAR characteristic of the user apparatus 100 does not satisfy the SAR condition indicated by the Required SAR provided from the base station 200, the control unit 130 shifts the process to step S2.

When the process proceeds to step S6, the control unit 130 of the user apparatus 100 determines the maximum transmission power of the first power class in the frequency band as the maximum transmission power of the user apparatus 100.

Through the above processing, the control unit 130 of the user apparatus 100 can determine the maximum transmission power in the frequency band according to the P-Max provided from the base station 200 and the Required SAR.

Further, even when the frequency band is the TDD band and 50% or more of the slots in the radio frame are uplink transmissions, the user apparatus 100 satisfies the requirement for Required SAR as long as the first power class is satisfied. Can be used.

Note that the maximum transmission power determination process shown in FIG. 4 is an example. For example, when the frequency band is a TDD band and 50% or more slots in the radio frame are uplink transmissions, when the Required SAR is not provided in step S4, the control unit 130 sets the default power class. The maximum transmission power may be determined as the maximum transmission power of the user apparatus 100.

(Initial access processing)
FIG. 6 is a sequence diagram illustrating an example of initial access processing according to an embodiment. This process is executed, for example, when the user apparatus 100 transitions from the idle state to the connected state.

In step S101, it is assumed that the user apparatus 100 supports 26 dBm of PC2 in the band X having 23 dBm of PC3 as a default power class. In step S102, the user apparatus 100 tries to be in the band X cell.

In step S103, the receiving unit 120 of the user apparatus 100 receives SIB1 (SystemInformationBlockType1), which is system information broadcast from the base station 200. The information element (IE: IEInformation Element) of SIB1 includes P-Max indicating the maximum transmission power, Required SAR indicating the SAR conditions to be satisfied by the user apparatus 100, and the like.

In step S104, the control unit 130 of the user apparatus 100 determines the maximum transmission power of the user apparatus 100 by the maximum transmission power determination process illustrated in FIG.

For example, it is assumed that P-Max is set to the maximum transmission power of 26 dBm of PC2 higher than the maximum transmission power of the default power class (PC3), and the SAR characteristics of the user apparatus 100 satisfy the Required SAR. In this case, the user apparatus 100 control unit 130 determines the maximum transmission power 26 dBm of the PC 2 as the maximum transmission power of the user apparatus 100.

Also, for example, it is assumed that P-Max is set to a maximum transmission power of 26 dBm of PC2 higher than the default power class (PC3), and the SAR characteristics of the user apparatus 100 do not satisfy the Required SAR. In this case, the control unit 130 determines the maximum transmission power 23 dBm of the default power class (PC3) as the maximum transmission power of the user apparatus 100.

Further, for example, when P-Max is set to the maximum transmission power of 26 dBm of PC3 higher than the default power class (PC2) and the Required SAR is not provided, the control unit 130 sets the maximum transmission power of PC2 to 26 dBm. A maximum transmission power of 100 is determined.

In step S <b> 105, the transmission unit 110 of the user apparatus 100 transmits a random access request (RA preamble) to the base station 200 according to the power class transmission rule determined by the control unit 130 and the maximum transmission power. In step S106, the base station 200 returns an RA response to the RA request, and establishes an RRC connection with the user apparatus 100 in step S107.

Thereafter, in step S108, the connection control unit 220 of the base station 200 transmits UE capability Enquiry to request capability information from the user apparatus 100. In step S <b> 109, the control unit 130 of the user apparatus 100 notifies the UE capability information indicating the terminal capability information of the user apparatus 100 to the base station 200 via the transmission unit 110. The UE capability information includes information such as the power class supported by the user apparatus 100 and the SAR characteristics of the user apparatus 100 in the band X, for example.

Note that the initial access process shown in FIG. 4 is an example. For example, in step S103 of FIG. 4, the system information (SIB1) transmitted by the base station 200 may include a plurality of Required SARs for one cell.

Preferably, when a plurality of Required SARs are included in the system information (SIB1), the plurality of Required SARs are arranged in descending order of priority.

Preferably, when the user apparatus 100 receives system information including a plurality of Required SARs, the maximum transmission is performed so as to satisfy the SAR condition indicated by the Required SAR having the highest priority among the SAR conditions supported by the user apparatus 100. Determine the power.

(Handover processing)
FIG. 7 is a sequence diagram illustrating an example of a handover process according to an embodiment. This process is executed, for example, when the user apparatus 100 performs a handover.

In step S201, it is assumed that the user apparatus 100 supports the PC2 of 26 dBm in the band X having the PC3 of 23 dBm as the default power class. In step S202, the user apparatus 100 receives a handover instruction (RRCConnectionReconfiguration with mobilityControlInfo) from the cell # 1 of the source base station (base station A) to the cell # 1 of the target base station (base station B). Here, the handover instruction includes P-Max, Required SAR, and the like.

In step S203, the control unit 130 of the user apparatus 100 determines the maximum transmission power of the user apparatus 100 by the maximum transmission power determination process illustrated in FIG.

In step S <b> 204, the transmission unit 110 of the user apparatus 100 transmits a random access request (RA preamble) to the base station 200 in accordance with the power class transmission rule determined by the control unit 130 and the maximum transmission power. In step S205, the base station 200 returns an RA response to the RA request. In step S206, the user apparatus 100 transmits a handover completion notification (RRCConnectionReconfigurationComplete) indicating establishment of RRC connection with the base station 200. .

Note that the handover process shown in FIG. 7 is an example. For example, in step S202 of FIG. 7, the base station A may determine the required SAR index to be notified to the user apparatus 100 with reference to the terminal capability information received in step S109 of FIG. Accordingly, it is possible to reduce the notification to the user apparatus 100 of the requirement SAR not supported by the user apparatus 100 in step S202 of FIG.

<Example of specification change>
An example of a specification change according to the above embodiment will be described with reference to FIGS. FIG. 8 shows a modification of section 6.2.1 of 3GPP TS 38.101-1, shown in Non-Patent Document 1. As shown in FIG. 8, a description 801 related to the processing of steps S4 and S5 in FIG. 4 is added, and a table 802 that defines the Required SAR described in FIG. 5 is added.

As a result, the restriction 803 when the frequency band is the TDD band and 50% or more of the slots in the radio frame are uplink transmissions is deleted, and the high power class supported by the user apparatus 100 is made more efficient. It becomes available.

FIG. 9 shows a modification example of the FrequencyUL information element 900 transmitted by the base station 200. The FrequencyUL information element 900 is an information element for providing the user apparatus 100 with basic parameters related to the uplink carrier and its transmission.

In the example of FIG. 9, requiredSAR 902 is added to FrequencyUL information element 900. As described above, the base station 200 provides the user equipment 100 with the FrequencyUL information element 900 including the required SAR 902 and the frequencyBandList 901. Note that the information element representing RequiredSAR is defined as shown in FIG. 10, for example.

<Hardware configuration>
The block diagrams (FIGS. 2 to 3) used in the description of the above-described embodiment show functional unit blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device in which a plurality of elements are physically and / or logically combined, or two or more devices physically and / or logically separated may be directly and directly. It may be realized by a plurality of these devices connected indirectly (for example, wired and / or wirelessly).

Also, for example, both the user apparatus 100 and the base station 200 in an embodiment of the present invention may function as a computer that performs processing according to the present embodiment. FIG. 11 is a diagram illustrating an example of a hardware configuration of the user apparatus 100 and the base station 200 according to the present embodiment. Each of the above-described user apparatus 100 and base station 200 may be physically configured as a computer apparatus including a processor 1001, a memory 1002, a storage 1003, a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006, a bus 1007, and the like. Good.

In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configurations of the user apparatus 100 and the base station 200 may be configured to include one or a plurality of apparatuses indicated by 1001 to 1006 shown in the figure, or may be configured not to include some apparatuses. May be.

Each function in the user apparatus 100 and the base station 200 is performed by causing the processor 1001 to perform calculation by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, communication by the communication apparatus 1004, and memory 1002. This is realized by controlling reading and / or writing of data in 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 a peripheral device, a control device, an arithmetic device, a register, and the like.

Further, the processor 1001 reads a program (program code), software module, or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the transmission unit 110, the reception unit 120, the control unit 130, and the storage unit 140 of the user device 100 illustrated in FIG. 2 may be realized by a control program stored in the memory 1002 and operating on the processor 1001. For example, the information transmission unit 210 and the connection control unit 220 of the base station 200 illustrated in FIG. 3 may be realized by a control program stored in the memory 1002 and operating on the processor 1001. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and includes, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to perform the processing according to the embodiment of the present invention.

The storage 1003 is a computer-readable recording medium such as an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. The storage 1003 may be called an auxiliary storage device. The storage medium described above may be, for example, a database, server, or other suitable medium including the memory 1002 and / or the storage 1003.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or 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, the transmission unit 110 and the reception unit 120 of the user device 100 may be realized by the communication device 1004. Further, the information transmission unit 210 of the base station 200 may 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, etc.) that accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.

In addition, the user apparatus 100 and the base station 200 are respectively a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a programmable logic device (FPD), an ASIC (Application Logic Integrated Circuit), a PLD (Programmable Logic Device), an AFP It may be configured including hardware, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.

<Supplement>
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. I will. Although specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may be applied to the matters described in (if not inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. About the processing procedure described in the embodiment, the processing order may be changed as long as there is no contradiction. For convenience of description of the processing, the user apparatus 100 and the base station 200 have been described using functional block diagrams, but such an apparatus may be realized by hardware, software, or a combination thereof. The software operated by the processor of the user apparatus 100 according to the embodiment of the present invention and the software operated by the processor of the base station 200 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only, respectively. It may be stored in any appropriate storage medium such as a memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server or the like.

Further, the notification of information is not limited to the aspect / embodiment described in the present specification, and may be performed by other methods. For example, the notification of information includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (MediumCong) It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof, and RRC signaling may be referred to as an RRC message, for example, RRC Connection setup (RRC Con ection Setup) message, RRC connection reconfiguration (it may be a RRC Connection Reconfiguration) message.

Each aspect / embodiment described in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Fureure Radio Access), and W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), The present invention may be applied to a Bluetooth (registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system.

The processing procedures, sequences, flowcharts and the like of each aspect / embodiment described in this specification may be switched in order as long as there is no contradiction. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

The specific operation assumed to be performed by the base station 200 in this specification may be performed by the upper node (upper node) in some cases. In a network including one or a plurality of network nodes having the base station 200, various operations performed for communication with the user apparatus 100 may be performed by the base station 200 and / or other than the base station 200. Obviously, it can be done by a network node (for example, but not limited to MME or S-GW). Although the case where there is one network node other than the base station 200 in the above is illustrated, a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.

Each aspect / embodiment described in this specification may be used alone, in combination, or may be switched according to execution.

User equipment 100 can be used by those skilled in the art to a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, It may also be referred to as a wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terminology.

Base station 200 may also be referred to by those skilled in the art as NB (Node B), eNB (enhanced Node B), base station (Base Station), gNB, or some other appropriate terminology.

As used herein, the terms “determining” and “determining” may encompass a wide variety of actions. “Judgment” and “determination” are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (investigation), investigation (investigating), search (loking up) (for example, table , Searching in a database or another data structure), considering ascertaining “determining”, “determining”, and the like. Further, “determination” and “determination” are reception (for example, receiving information), transmission (for example, transmitting information), input (input), output (output), and access. (Accessing) (for example, accessing data in a memory) may be considered as “determining” or “determining”. In addition, “determination” and “determination” means that “resolving”, selection (selecting), selection (choosing), establishment (establishing), comparison (comparing), etc. are regarded as “determination” and “determination”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.

As used herein, the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

As long as the terms “including”, “including”, and variations thereof are used herein or in the claims, these terms are similar to the term “comprising”. It is intended to be comprehensive. Furthermore, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

Throughout this disclosure, if articles are added by translation, for example, a, an, and the in English, these articles are not clearly indicated otherwise from the context, Multiple can be included.

Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

DESCRIPTION OF SYMBOLS 10 Radio | wireless communications system 100 User apparatus 110 Transmission part 120 Reception part 130 Control part 200 Base station 210 Information transmission part 220 Connection control part

Claims

A transmitter that supports a first power class in a frequency band;
A receiver for receiving a radio signal transmitted by the base station;
In the frequency band having a second power class lower than the first power class as a default power class, the reception unit receives the radio signal including information indicating a specific absorption rate condition to be satisfied by the user apparatus. A control unit that determines a maximum transmission power of the transmission unit so as to satisfy a specific absorption rate that the user apparatus should satisfy,
A user equipment.
The controller is
The reception unit receives the radio signal including information indicating the maximum transmission power of the first power class and information indicating a condition of a specific absorption rate to be satisfied by the user apparatus, and the user apparatus includes: If the user equipment satisfies the specific absorption rate condition to be satisfied,
The user apparatus according to claim 1, wherein the maximum transmission power of the first power class is determined as the maximum transmission power of the transmission unit in accordance with the definition of the first power class in the frequency band.
The controller is
The reception unit receives the radio signal including information indicating the maximum transmission power of the first power class and information indicating a condition of a specific absorption rate to be satisfied by the user apparatus, and the user apparatus includes: If the user equipment does not meet the specific absorption rate condition to be satisfied,
The user apparatus according to claim 1 or 2, wherein the maximum transmission power of the default power class is determined as the maximum transmission power of the transmission unit in accordance with the definition of the default power class in the frequency band.
The controller is
The reception unit receives the radio signal including information indicating the maximum transmission power of the first power class, and the radio signal does not include information indicating a specific absorption rate condition that the user apparatus should satisfy If
The user according to any one of claims 1 to 3, wherein the maximum transmission power of the first power class is determined as the maximum transmission power of the transmission unit in accordance with the definition of the first power class in the frequency band. apparatus.
A connection control unit for controlling wireless connection with the user device;
In a frequency band having a second power class lower than the first power class as a default power class, information on maximum transmission power applied to the frequency band and a condition of a specific absorption rate that the user apparatus should satisfy An information transmission unit for transmitting system information including information;
Having a base station.