JP2018117180A - Communication terminal device, base station, and communication network side device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication terminal device capable of expanding a communication area communicable with a base station while suppressing an increase in load of the base station, and also to provide the base station and a communication network side device.SOLUTION: Disclosed is a communication terminal device used for a mobile communication system. The communication terminal device includes:a wireless communication part capable of selectively executing an IoT communication mode in which communication for IoT (Internet of Things) is performed with a base station, and a broadband communication mode in which broadband communication is performed with the base station in a narrower area than an IoT communication area capable of communicating therewith in the IoT communication mode; and a control part for controlling a wireless communication part to switch between the broadband communication mode and the IoT communication mode so as to communicate with the base station.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a communication terminal device, a base station, and a communication network side device of a mobile communication system.

  2. Description of the Related Art Conventionally, a communication standard called LTE-AdvancedPro, which is an extension of 3GPP LTE (Long Term Evolution) -Advanced (see Non-Patent Document 1), which is a communication standard for mobile communication systems, is known (see Non-Patent Document 2). . In LTE-AdvancedPro, specifications for providing communication to devices for recent IoT (Internet of Things) have been formulated. Here, “IoT” is a general term for a form in which various things are connected to the Internet or the cloud, and control / information communication is performed. And in LTE-AdvancedPro, in order to support IoT, the price of the communication terminal device (also referred to as “UE (user device)”) used by the user is reduced and the coverage area that can communicate with the base station is expanded. Accordingly, two new communication standards (eMTC, NB-IoT) are supported. In a communication terminal device of eMTC (also referred to as “eMTC: enhanced Machine-Type Communications”), the reception bandwidth is limited to 1.4 MHz, and coverage extension of about 15 dB is supported. In addition, a communication terminal apparatus of NB-IoT (also referred to as “NB-IoT: NarrowBand-IoT”) has a reception bandwidth limited to 200 kHz, supports a coverage extension of about 23 dB, and can be used in an LTE frequency band. .

There are out of service areas that cannot communicate with base stations in mountainous areas, suburbs, underground, etc., but it may be difficult to newly install base stations. In this case, it is necessary to expand the coverage area capable of communicating with the existing base station so as to minimize the out-of-service area.
In the event of an emergency such as a power outage or earthquake, some base stations may be unable to communicate, the number of operating base stations may be reduced, and the coverage area of the base station may be reduced. In such an emergency, it is necessary to expand a coverage area that can communicate with an active base station in order to ensure emergency communication.
On the other hand, when the communication area (coverage area) where the communication terminal device can communicate with the base station is expanded, the number of terminals that perform simultaneous communication per base station may increase, and the load on the base station may increase.

A communication terminal apparatus according to an aspect of the present invention is a communication terminal apparatus used in a mobile communication system, and performs IoT (Internet of Things) communication with a base station, and the IoT communication mode. A wireless communication unit capable of selectively executing a wideband communication mode for performing broadband communication with the base station in an area narrower than an IoT communication area communicable with the mobile station, and the wideband communication mode and the IoT communication mode, And a control unit that controls the radio communication unit so as to communicate with the base station.
The communication terminal apparatus may further include an automatic switching unit that automatically switches between the broadband communication mode and the IoT communication mode based on a communication status with the base station.
In the communication terminal apparatus, the communication status may be determined based on received power or reception quality of a reference signal from the base station.
In the communication terminal apparatus, the communication unit communicates with the base station preferentially using the broadband communication mode when communication is possible in the broadband communication mode and the IoT communication mode. When moving out of the area, the broadband communication mode is switched to the IoT communication mode to communicate with the base station, and when moving out of the IoT communication area, the base station according to the IoT communication mode The wireless communication unit may be controlled to receive at least one of a signal and a signal from the base station in the broadband communication mode at a predetermined interval.
Further, in the communication terminal device, the control unit, when the received power or the communication quality measured in the broadband communication mode exceeds a predetermined threshold or exceeds the threshold, the broadband communication from the IoT communication mode. The wireless communication unit may be controlled to switch to a mode and communicate with the base station.
The communication terminal device may further include manual switching means for switching between the broadband communication mode and the IoT communication mode by a user operation.
In the communication terminal device, the broadband communication mode may be a communication mode conforming to a third generation (3G), LTE (Long Term Evolution), LTE-Advanced or LTE-Advanced Pro standard of mobile communication, or a fifth communication mode. It may be a communication mode of a new radio access technology (5G (New Radio)) proposed in the generation mobile communication, and the IoT communication mode is an eMTC (enhanced machine-type communications) or NB of LTE-Advanced Pro. -Communication mode compliant with IoT (Narrow Band-IoT) standard, or large-scale machine type communication (5G (mMTC: massive machine) proposed in 5th generation mobile communication -Type Communications)) may be a communication mode of.
In the communication terminal apparatus, the wireless communication unit may include a first wireless communication unit that communicates in the broadband communication mode and a second wireless communication unit that communicates in the IoT communication mode.
In the communication terminal device, the first wireless communication unit and the second wireless communication unit may be configured by different electronic circuit components.
In the communication terminal device, the first wireless communication unit and the second wireless communication unit are configured to be able to output parameter values indicating communication states in the broadband communication mode and the IoT communication mode, respectively. Also good.
The communication terminal apparatus may further include an application execution management unit that limits an application that can be activated when the terminal is located in the IoT communication area and is communicating with the base station in the IoT communication mode.

A base station according to another aspect of the present invention is a base station capable of wireless communication with any one of the communication terminal apparatuses, wherein the communication terminal apparatus is located in the IoT communication area and is in the IoT communication mode. And means for limiting the data transfer rate in the uplink direction, the downlink direction, or both directions for the communication terminal apparatus when communicating with the own station. Here, the data transfer rate includes the received power and communication quality in the communication terminal apparatus communicating in the IoT communication mode, and the amount of radio resources used by the base station for communication in the IoT communication mode. You may restrict | limit for every communication terminal device based on at least one.
Further, a base station according to still another aspect of the present invention is a base station capable of wireless communication with any one of the communication terminal apparatuses, based on the communication status of the broadband communication mode and the IoT communication mode. It comprises means for changing a ratio of radio resources that can be used in a communication mode, and means for transmitting control information including the ratio of radio resources to the communication terminal apparatus.
A communication network side device according to still another aspect of the present invention is a communication network side device connected to a base station capable of wireless communication with any one of the communication terminal devices, wherein the communication terminal device is the IoT. Means for limiting a data transfer rate in an uplink direction, a downlink direction, or both directions with respect to the communication terminal apparatus when being in a communication area and communicating in the IoT communication mode; Here, the data transfer rate is at least the received power and communication quality of a communication terminal apparatus communicating in the IoT communication mode, and the amount of radio resources used by the base station for communication in the IoT communication mode. Based on one, you may restrict | limit for every communication terminal device.

  According to the present invention, when moving from the broadband communication area of the base station to the extended IoT communication area based on the communication status with the base station, the broadband communication mode can be switched to the IoT communication mode to communicate with the base station. Moreover, in the IoT communication area extended from the broadband communication area, the load on the base station can be suppressed by limiting the throughput by performing IoT communication with the base station in the IoT communication mode. Therefore, it is possible to expand the communication area capable of communicating with the base station while suppressing an increase in the load on the base station.

Explanatory drawing for demonstrating the difference of the coverage area of the broadband communication mode (1st communication mode) and IoT communication mode (2nd communication mode) of the mobile communication system which concerns on this embodiment. Explanatory drawing for demonstrating the state which the communication terminal device which concerns on this embodiment communicates in the coverage area of each of broadband communication mode and IoT communication mode. The block diagram which shows an example of schematic structure of the communication terminal device which concerns on this embodiment. The block diagram which shows schematic structure of the radio | wireless communication part and communication mode switching part of the communication terminal device which concern on this embodiment. The state transition diagram which shows an example of the state transition at the time of the communication mode switching process in the communication terminal device which concerns on this embodiment. (A), (b), and (c) are explanatory drawings explaining the change of the radio resource ratio between broadband communication and IoT communication by the base station when normal, disaster, and the number of broadband communication connection terminals are small, respectively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram for explaining a difference in coverage area between the broadband communication mode (first communication mode) and the IoT communication mode (second communication mode) of the mobile communication system according to the present embodiment. Moreover, FIG. 2 is explanatory drawing for demonstrating the state which a communication terminal device communicates in the coverage area of each of wideband communication mode and IoT communication mode. Here, the IoT communication mode is a communication mode in which IoT communication is performed with a base station. For example, communication conforming to the LTE-Advanced Pro eMTC or NB-IoT standard (see Non-Patent Document 2). This is a communication mode of a large-scale machine type communication (5G (mMTC: massive machine-type communications)) (see Non-Patent Document 3) proposed in the fifth mode mobile communication. The broadband communication mode is a communication mode in which broadband communication is performed with a base station in a broadband communication area narrower than the IoT communication area in which communication is possible in the IoT communication mode. For example, the third generation (3G of mobile communication) ), A new radio access technology (5G (New Radio)) proposed in LTE, LTE-Advanced or LTE-Advanced Pro standards, or 5th generation mobile communication (Non-Patent Document 4) -12)).

  Hereinafter, a case where the broadband communication mode is a communication mode compliant with the LTE standard and the IoT communication mode is a communication mode compliant with the NB-IoT communication standard will be described.

  As shown in FIG. 1, the base station 20 has a broadband communication mode communication coverage area (wideband communication area) 21 and an IoT communication mode communication coverage area (IoT communication area) 22. The coverage area 22 in the IoT communication mode is set wider than the coverage area 21 in the broadband communication mode mode, for example, by 3 to 5 times in the cell radius and 9 to 25 times in the cell area.

  The communication terminal device 10 according to the present embodiment is configured to be compatible with both the broadband communication mode and the IoT communication mode. In FIG. 2, the communication terminal apparatus 10 performs communication in the broadband communication mode when the communication terminal apparatus 10 is in the coverage area 21 in the broadband communication mode. When the communication terminal apparatus 10 moves from the coverage area 21 in the broadband communication mode to the coverage area 22 in the IoT communication mode, the communication mode is switched from the broadband communication mode to the IoT communication mode, and communication is performed in the IoT communication mode.

  FIG. 3 is a block diagram illustrating an example of a hardware configuration of the communication terminal device 10 according to the present embodiment. The communication terminal device 10 includes a main control unit 110, a wireless communication unit 111, a communication mode switching unit 112, a sound input / output unit 113, a display unit 114, and an operation unit 115 as an operation unit. In addition, the communication terminal apparatus 10 is equipped with a UICC 15 that can be attached to and detached from the apparatus main body. The UICC 15 incorporates a function as a USIM used in a mobile communication service.

  The main control unit 110 includes an MPU (micro processing unit), a RAM, a ROM, and the like, and controls each unit such as the communication mode switching unit 112 by executing a program such as a predetermined basic OS or middleware. Or build a native platform environment or application execution environment on the software configuration.

The main control unit 110 can function as the following units (1) to (4) by cooperating with other units such as the other wireless communication unit 111, the communication mode switching unit 112, and the operation unit 115.
(1) A control unit that controls the wireless communication unit 111 to communicate with the base station 20 by switching between the broadband communication mode and the IoT communication mode.
(2) Automatic switching means for automatically switching between the broadband communication mode and the IoT communication mode based on the communication status with the base station 20.
(3) Means for determining based on the reception power or reception quality of the reference signal from the base station 20.
(4) Manual switching means for switching between the broadband communication mode and the IoT communication mode by a user operation.

  The communication status with the base station 20 may be determined based on, for example, received power (RSRP: Reference Signal Received Power) or received quality (RSRQ: Reference Signal Received Quality) of a reference signal from the base station 20. The values of parameters such as RSRP and RSRQ indicating the communication status in the broadband communication mode and the IoT communication mode are used for broadband communication (LTE communication) constituting a baseband processing unit of the broadband communication mode in the first wireless communication unit described later. For example, the IoT communication chip constituting the baseband processing unit in the IoT communication mode in the chip and the second wireless communication unit may output to the main control unit 110.

  The wireless communication unit 111 functions as a network communication unit that communicates via a mobile communication network, and includes, for example, a synthesizer, a frequency converter, a high-frequency amplifier, and the like, and performs wireless communication with the base station 20 of the mobile communication network. High-frequency signal processing is performed.

  The wireless communication unit 111 according to the present embodiment includes two broadband communication (LTE communication) chips that constitute a baseband processing unit in the broadband communication mode and two IoT communication chips that constitute a baseband processing unit in the IoT communication mode. The communication mode is switched by switching the chip used for communication to either one by the communication mode switching unit 112 (see FIG. 4 described later).

  The communication mode switching unit 112 is connected to the wireless communication unit 111. As described above, the baseband processing unit used for communication is a baseband processing unit including a broadband communication (LTE communication) chip and an IoT communication chip. By switching to one of the baseband processing units consisting of the above, switching processing between the broadband communication mode (LTE mode) and the IoT communication mode is executed.

  The sound input / output unit 113 includes a microphone, a speaker, a sound signal processing unit, and the like. The analog audio signal output from the microphone is converted into a digital signal by the sound signal processing unit and sent to the main control unit 110, the wireless communication unit 111, and the like. The speaker receives an analog signal converted from a digital signal by the sound signal processing unit, and outputs a voice during a call, or outputs a ringtone for a mail, a ringing tone for a telephone, music, or the like. The speaker may be configured by separately providing a receiver speaker (receiver) for listening to voice during a call and an external output speaker for outputting ringtones, music, etc. You may comprise with one speaker so that a speaker and an external output speaker may be combined.

  The display unit 114 is configured by an LCD (liquid crystal display) or the like, and displays various images based on commands from the main control unit 110. The operation unit 115 includes a touch panel incorporated in the display unit 114, various operation keys and buttons, a power switch as a power ON / OFF unit, and the like. The operation unit 115 allows the user to switch communication modes, turn on / off the main body power of the communication terminal device 10, instruct to start / end a call, select a menu, switch screens, etc., and input information It is used when doing.

  In addition, the communication terminal device 10 includes a GPS (global positioning system) unit 117 as a position information acquisition unit, a camera unit 118 as an imaging unit, a sensor unit 119, a power supply unit 120 as a power supply unit, a watch (not shown). The department etc. are also provided.

  The GPS unit 117 includes a GPS receiving module, a GPS antenna, and the like, receives radio waves from a plurality of GPS satellites arranged around the earth, and the latitude and longitude at which the communication terminal device 10 is located based on the reception result And altitude data. The camera unit 118 includes a lens, an imaging device, and the like, and is used when shooting a person, a landscape, and the like. As an imaging device, a CCD (Charge Coupled Device) camera or a CMOS camera can be used. The sensor unit 119 includes an acceleration sensor and / or a geomagnetic sensor. The acceleration sensor may be a uniaxial acceleration sensor or a multi-axis acceleration sensor such as a biaxial or triaxial acceleration sensor. Further, the geomagnetic sensor may be a uniaxial geomagnetic sensor, or may be a multiaxial geomagnetic sensor such as a biaxial or a triaxial. Based on the output of the sensor unit 119, data indicating the position, orientation, posture, and movement of the communication terminal device 10 can be calculated. Further, based on the output of the sensor unit 119, the communication terminal device 10 determines whether or not the communication terminal device 10 is based on history information that is information on temporal changes in acceleration data and geomagnetic data when the user's communication terminal device 10 moves from a reference position at a predetermined altitude. Data indicating the altitude, angle, and the like that are located can be calculated.

  The power supply unit 120 includes a rechargeable battery, a power supply circuit that supplies power of a predetermined voltage from the battery to each unit, a charging circuit that charges the battery, and the like. The power supply unit 120 also supplies power to the main part of the communication terminal device 10, that is, the sound input / output unit 113, the display unit 114, a part of the operation unit 115, the GPS unit 117, the camera unit 118, and the sensor unit 119. The above-described power switch that can be operated by the user can be turned ON / OFF. In order to operate some functions when the power switch is OFF, the power supply unit 120 is configured to continuously supply power to the wireless communication unit 111 and the UICC 15 even when the power switch is OFF. Also good.

  The clock unit is configured by a clock circuit or the like, counts accurate date and time, and generates time information for various update processes, for example.

  FIG. 4 is a block diagram illustrating a schematic configuration of the wireless communication unit 111 and the communication mode switching unit 112 of the communication terminal device 10 according to the present embodiment. As shown in FIG. 4, the wireless communication unit 111 includes a first baseband processing unit 135A and an IoT composed of a broadband communication (LTE communication) chip optimized for the broadband communication mode (LTE communication mode) and the IoT communication mode, respectively. A second baseband processing unit 135B made of a communication chip and a high-frequency radio signal processing unit 136 shared for the broadband communication mode and the IoT communication mode are provided. The high-frequency wireless signal processing unit 136 includes an antenna 130, a DUP (Duplexer: duplexer) 131, a reception power amplifier 133, and a transmission power amplifier 134. In addition, a communication mode switching unit 112 is connected to the baseband processing units 135A and 135B.

  As shown in FIG. 4, the wireless communication unit 111 is a broadband communication (LTE communication) chip that constitutes the first baseband processing unit 135A and an IoT communication chip that constitutes the second baseband processing unit 135B. One chip is provided, and the chip used by the communication mode switching unit 112 is switched as hardware depending on the communication mode used. Switching of the communication mode is performed by automatically switching the chip used by the communication mode switching unit 112 based on a control signal from the main control unit 110 when the coverage area in which the communication terminal apparatus 10 has moved and moved is changed. By doing. As described above, the communication mode is automatically switched, but may be manually performed by the user operating the operation unit 115. Further, the baseband processing unit of the wireless communication unit 111 may be configured using a single chip capable of broadband communication (LTE communication) and IoT communication, and the communication mode may be switched by software.

Next, an example of the state transition at the time of the communication mode switching process in the communication terminal device 10 according to the present embodiment will be described.
FIG. 5 is a flowchart illustrating an example of state transition during the communication mode switching process. In FIG. 5, when the communication terminal apparatus 10 performs broadband communication by starting the broadband communication mode 502, the received power (RSRP) or communication quality (RSRQ) of the reference signal during the broadband communication is a predetermined threshold value. If the received power (RSRP) or communication quality (RSRQ) falls below the predetermined threshold or falls below the predetermined threshold, the IoT is determined. The communication mode 504 is entered (506).

  In addition, when the communication terminal device 10 activates the IoT communication mode 504 and performs IoT communication, the received power (RSRP) or communication quality (RSRQ) of the reference signal during the IoT communication exceeds a predetermined threshold value. Wideband communication when the received power (RSRP) or communication quality (RSRQ) exceeds a predetermined threshold or exceeds a predetermined threshold. The mode is shifted to mode 502 (507).

  In the IoT communication mode, the broadband communication mode is activated at regular intervals, and it is determined whether or not the received power (RSRP) or communication quality (RSRQ) exceeds a predetermined threshold or exceeds a predetermined threshold. May be. If the received power (RSRP) or communication quality (RSRQ) does not exceed the predetermined threshold or does not exceed the predetermined threshold, the broadband communication mode is stopped and the IoT communication mode is maintained. Good.

  As described above, according to the present embodiment, when moving from the broadband communication mode coverage area 21 of the base station 20 to the extended IoT communication mode coverage area 22 based on the communication status with the base station 20, Switching to the IoT communication mode enables communication with the base station 20, and in the coverage area 22 of the IoT communication mode, the base station 20 is limited in throughput by communicating with the base station 20 with a narrower frequency bandwidth than the broadband communication mode. The load on the station 20 can be suppressed. Therefore, it is possible to expand a communication area that can communicate with the base station 20 while suppressing an increase in the load on the base station 20.

  In the mobile communication system according to this embodiment, the radio resource allocation by the base station 20 may be changed. For example, when a plurality of communication terminal apparatuses 10 are present in the coverage area, the use bands of the broadband communication and the IoT communication may be changed over the entire bandwidth according to the communication status.

  FIGS. 6A, 6B, and 6C are radio resources for broadband communication and IoT communication by the base station 20 when the number of broadband communication connection terminals communicating in the broadband communication mode is small during normal times, disasters, and times, respectively. It is explanatory drawing explaining the change of these ratios.

As shown in FIG. 6A, the base station 20 at the normal time changes the ratio of radio resources so that the ratio of IoT communication is less than that of broadband communication in the entire bandwidth.
Also, as shown in FIG. 6B, the base station 20 at the time of disaster changes the ratio of radio resources so that the ratio of IoT communication out of the total bandwidth is larger than that of broadband communication. Thereby, at the time of a disaster, a coverage area expands compared with the normal time, and it becomes possible to perform IoT communication with more communication terminal devices 10.
Further, as shown in FIG. 6C, when the number of broadband communication connection terminals communicating in the broadband communication mode is small, the base station 20 is configured so that the ratio of IoT communication in the total bandwidth is slightly higher than that in broadband communication. The ratio of radio resources is changed. As a result, when the number of broadband communication connection terminals is small, the coverage area is expanded as compared with the normal time, and IoT communication can be performed with more communication terminal apparatuses 10.

  When the coverage area is expanded and a large number of communication terminal devices 10 are simultaneously connected to the base station 20 as in the case of FIGS. 6B and 6C described above, the IoT communication mode is used. By limiting the use bandwidth to the communication terminal device 10 connected in this manner, the throughput is limited and an increase in the load on the network can be suppressed.

  In addition, when a large number of communication terminal apparatuses 10 are simultaneously connected to the base station 20 in the extended area extended from the broadband communication mode coverage area 21 in the coverage area 22 of the IoT communication mode, the extended area By restricting applications (hereinafter also referred to as “apps”) that can be used in communication terminal apparatus 10 that is located and performing IoT communication, an increase in load on the network can be suppressed. For example, when using the communication terminal device 10 in the broadband communication mode, all applications can be used, whereas when using the communication terminal apparatus 10 in the IoT communication mode, a limitation is set on applications that can be used from operations by software. Other than some applications may be disabled. In this case, examples of applications that can be used in the IoT communication mode include an application that transmits and receives a short message, a call application, and a disaster application.

  The method of limiting the applications that can be used in the broadband communication mode is not limited to the above-described operation by software, and when the communication terminal device 10 is used in the IoT communication mode, the use restriction on the communication terminal device 10 from the network side. The application to be notified may be notified, and the use of the application for which the communication terminal device 10 has been notified may be restricted. In addition, if an application restriction flag is prepared on the network side server and the application makes an inquiry to the network side server periodically or irregularly, and the application restriction flag is set, use of that application May be restricted.

  In the above embodiment, the base station 20 capable of wireless communication with the communication terminal device 10 is located in the coverage area 22 of the IoT communication mode and is communicating with the own station in the IoT communication mode. In addition, a means for limiting the data communication speed [bps] for the communication terminal apparatus 10 may be provided. For example, the transfer data rate for the communication terminal apparatus 10 communicating in the IoT communication mode is limited to be lower than the transfer data rate for the communication terminal apparatus communicating in the broadband communication mode. The means for limiting the transfer data rate for the communication terminal apparatus 10 communicating in the IoT communication mode may be provided in a communication network side apparatus such as a core network apparatus provided in the core network to which the base station 20 is connected. Good. By limiting the transfer data rate for the communication terminal apparatus 10 communicating in the IoT communication mode, the throughput in the coverage area 22 in the IoT communication mode is limited, and an increase in the load on the network can be suppressed.

  Here, the transfer data rate restricted by the base station 20 or the core network device is located in the coverage area 22 when a plurality of communication terminal devices 10 are in the coverage area 22 of the IoT communication mode. You may set according to the number of the communication terminal devices 10 which are present. For example, when the number of communication terminal devices 10 existing in the coverage area 22 is large, the transfer data rate is limited to be low, and when the number of communication terminal devices 10 is small, the transfer data rate is limited to be high. Also good. The transfer data rate limited by the base station 20 or the core network device may be set for each communication terminal device 10. For example, the transfer data rate may be limited for each communication terminal device 10 according to the type of application running on the communication terminal device 10. More specifically, since the communication data amount is small for the communication terminal device 10 in which an application for transmitting / receiving a short message, a call application, a disaster application, or the like is activated, the transfer data rate is limited to be low. As many communication terminal devices 10 as possible can communicate at the same time, and the communication terminal device 10 running an application with a large amount of communication data according to the network status is transferred so that the application operates normally. The data rate may be limited to a higher value.

  Note that the processing steps described in this specification and the components of the mobile communication system, base station, and communication terminal device (user terminal device, mobile station) can be implemented by various means. For example, these steps and components may be implemented in hardware, firmware, software, or a combination thereof.

  Regarding hardware implementation, means such as processing units used to realize the above-described steps and components in an entity (for example, various wireless communication devices, NodeBs, communication terminal devices, hard disk drive devices, or optical disk drive devices) One or more application specific ICs (ASICs), digital signal processors (DSPs), digital signal processors (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), It may be implemented in a processor, controller, microcontroller, microprocessor, electronic device, other electronic unit designed to perform the functions described herein, a computer, or a combination thereof.

  In addition, for firmware and / or software implementation, each unit used to realize the above components includes a program (for example, a procedure, a function, a module, an instruction, etc.) that executes the functions described in this specification. ). In general, any computer / processor readable medium that specifically embodies firmware and / or software code is means such as a processing unit used to implement the steps and components described herein. May be used to implement For example, firmware and / or software code may be stored in a memory and executed by a computer or a processor, for example, in a control device or a storage device. The memory may be implemented inside the computer or processor, or may be implemented outside the processor. The firmware and / or software code may be, for example, random access memory (RAM), read only memory (ROM), nonvolatile random access memory (NVRAM), programmable read only memory (PROM), electrically erasable PROM (EEPROM) ), FLASH memory, floppy disk, compact disk (CD), digital versatile disk (DVD), magnetic or optical data storage, etc. Good. The code may be executed by one or more computers or processors, and may cause the computers or processors to execute the functional aspects described herein.

  Also, descriptions of embodiments disclosed herein are provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. The present disclosure is therefore not limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

10 Communication Terminal Device 20 Base Station 21 Broadband Communication Mode Communication Coverage Area (Wideband Communication Area)
22 IoT communication mode communication coverage area (IoT communication area)
110 main control unit 111 wireless communication unit 112 communication mode switching unit 130 antenna 131 DUP (shared duplexer)
133 Reception power amplifier 134 Transmission power amplifier 135A, B Baseband processing unit 136 High frequency signal processing unit

3GPP TS 36.300 V10.12.0 (2014-12). 3GPP TS 36.300 V13.5.0 (2016-09). C. Bockelmann, et al. , "Massive Machine-type Communications in 5G: Physical and MAC-layer solutions", IEEE Communications Magazine (Volume: 54, Issue: 9, September 16). G. Romano, “3GPP RAN progress on“ 5G ””, [online], [searched on December 27, 2016], Internet (URL: http://www.3gpp.org/ftp/Information/presentations/presentations_2016 /3GPP%20RAN%20Progress%20on%205G%20-%20NetFutures.pdf). 3GPP TR 38.801 V1.0.0 (2016-12). 3GPP TR 38.802 V1.0.0 (2016-11). 3GPP TR 38.803 V1.0.0 (2016-12). 3GPP TR 38.804 V0.4.0 (2016-11). 3GPP TR 38.805 V0.0.2 (2016-12). 3GPP TR 38.900 V14.1.0 (2016-09). 3GPP TR 38.912 V0.0.2 (2016-09). 3GPP TR 38.913 V14.0.0 (2016-10).

Claims (16)

A communication terminal device used in a mobile communication system,
Broadband communication that performs broadband communication with the base station in an IoT communication mode that performs IoT (Internet of Things) communication with a base station and an area that is narrower than an IoT communication area that can communicate with the IoT communication mode A wireless communication unit capable of selectively executing a communication mode;
A communication terminal apparatus comprising: a control unit that controls the radio communication unit to switch between the broadband communication mode and the IoT communication mode and communicate with the base station. The communication terminal device according to claim 1,
A communication terminal apparatus comprising: an automatic switching unit that automatically switches between the broadband communication mode and the IoT communication mode based on a communication status with the base station. In the communication terminal device according to claim 2,
The communication terminal apparatus is characterized in that the communication status is determined by reception power or reception quality of a reference signal from the base station. In the communication terminal device according to claim 2 or 3,
The controller is
If you are in a broadband communication area where communication is possible in the broadband communication mode and the IoT communication mode, communicate with the base station using the broadband communication mode preferentially,
When moving out of the broadband communication area, switch from the broadband communication mode to the IoT communication mode to communicate with the base station,
When moving outside the IoT communication area, at least one of a signal from the base station in the IoT communication mode and a signal from the base station in the broadband communication mode is received at a predetermined interval.
A communication terminal apparatus that controls the wireless communication unit. In the communication terminal device in any one of Claims 2 thru | or 4,
When the received power or communication quality measured in the broadband communication mode exceeds a predetermined threshold value or more than the threshold value, the control unit switches from the IoT communication mode to the broadband communication mode and A communication terminal apparatus that controls the wireless communication unit to communicate. In the communication terminal device in any one of Claims 1 thru | or 5,
A communication terminal device comprising manual switching means for switching between the broadband communication mode and the IoT communication mode by a user operation. In the communication terminal device in any one of Claims 1 thru | or 6,
The broadband communication mode is proposed in the third generation (3G) of mobile communication, LTE (Long Term Evolution), a communication mode compliant with LTE-Advanced or LTE-Advanced Pro standards, or five generations of mobile communication. A new wireless access technology (5G (New Radio)) communication mode,
The IoT communication mode is a communication mode compliant with the LTE-Advanced Pro eMTC (enhanced Machine-Type Communications) or NB-IoT (NarrowBand-IoT) standard, or a large-scale proposed in the fifth generation mobile communication. A communication terminal apparatus characterized by being in a communication mode of scale machine type communication (5G (mMTC: massive machine-type communications)). In the communication terminal device in any one of Claims 1 thru | or 7,
The wireless communication unit includes a first wireless communication unit that communicates in the broadband communication mode and a second wireless communication unit that communicates in the IoT communication mode. The communication terminal device according to claim 8.
The communication terminal apparatus, wherein the first wireless communication unit and the second wireless communication unit are configured by different electronic circuit components. In the communication terminal device according to claim 8 or 9,
The first wireless communication unit and the second wireless communication unit are configured to be able to output parameter values indicating communication states in the broadband communication mode and the IoT communication mode, respectively. . In the communication terminal device in any one of Claims 1 thru | or 10,
A communication terminal apparatus comprising: an application execution management unit that limits applications that can be activated when the terminal is in the IoT communication area and is communicating with the base station in the IoT communication mode. A base station capable of wireless communication with the communication terminal device according to claim 1,
The communication terminal apparatus includes means for limiting a data transfer rate in an uplink direction, a downlink direction, or both directions for the communication terminal apparatus when the communication terminal apparatus is in the IoT communication area and is communicating with the local station in the IoT communication mode. A base station characterized by that. The base station of claim 12,
The data transfer rate is at least one of reception power and communication quality in a communication terminal apparatus communicating in the IoT communication mode, and a usage amount of radio resources used by the base station for communication in the IoT communication mode. Based on the above, the base station is limited for each communication terminal device. A base station capable of wireless communication with the communication terminal device according to claim 1,
Means for changing a ratio of radio resources that can be used in each communication mode based on the communication status of the broadband communication mode and the IoT communication mode;
Means for transmitting control information including a ratio of the radio resources to the communication terminal apparatus. A communication network side device connected to a base station capable of wireless communication with the communication terminal device according to any one of claims 1 to 11,
The communication terminal device comprises means for limiting a data transfer rate in an uplink direction, a downlink direction, or both directions with respect to the communication terminal device when the communication terminal device is in the IoT communication area and is communicating in the IoT communication mode. A communication network side device. The communication network side device according to claim 15,
The data transfer rate is at least one of reception power and communication quality of a communication terminal apparatus communicating in the IoT communication mode, and usage of radio resources used by the base station for communication in the IoT communication mode. A communication network side device that is limited for each communication terminal device.