Patent Publication Number: US-2023164260-A1

Title: Communication apparatus, method, and program

Description:
FIELD 
     The present disclosure relates to a communication apparatus, a method, and a program. 
     BACKGROUND 
     In 5th generation mobile communication system (5G), standardization for large-capacity communication such as for 10 to 20 Gbps using wideband transmission that uses a frequency band (28 GHz) higher than that of 4G (LTE) has proceeded. Centimeter waves or millimeter waves used in such a high frequency band have a short wavelength, achieving an increased capacity of data to be transmitted and a reduced size of antennas. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: JP 2019-213747 A 
     SUMMARY 
     Technical Problem 
     However, the centimeter waves and millimeter waves have highly straight propagation, and are easily affected by an obstruction such as a building, a person, or a vehicle. For example, when a user himself/herself becomes an obstruction between a communication apparatus such as a smartphone supporting 5G and a base station, signal strength is reduced depending on the direction in which the user faces even at the same place, considerably deteriorating communication quality. Therefore, it is necessary to guide the user to turn in a direction in which high signal strength is received. 
     Meanwhile, depending on a method of guiding the orientation of the user, there is a possibility to hinder, for example, the user experience (UX) of the user who enjoys video distribution, games, or the like on the communication apparatus. 
     Therefore, the present disclosure proposes a communication apparatus, a method, and a program that are configured to guide a user to turn in a direction in which high signal strength is received, without hindering the UX of the user of the communication apparatus using high frequency band as much as possible. 
     Solution to Problem 
     According to the present disclosure, a communication apparatus includes: a determination unit that determines a direction in which the communication apparatus faces; a measurement unit that measures signal strength indicating strength of a radio wave received by the communication apparatus; a notification unit that notifies a user of the signal strength falling below a first threshold; and a display unit that superimposes a direction in which the signal strength exceeds a second threshold, as first display, on second display being displayed. 
     Moreover, according to the present disclosure, a method includes: by a communication apparatus, determining a direction in which the communication apparatus faces; measuring signal strength indicating strength of a radio wave received by the communication apparatus; notifying a user of the signal strength falling below a first threshold; and superimposing a direction in which the signal strength exceeds a second threshold, as first display, on second display being displayed. 
     Moreover, according to the present disclosure, a program causes a communication apparatus to perform: determining a direction in which the communication apparatus faces; measuring signal strength indicating strength of a radio wave received by the communication apparatus; notifying a user of the signal strength falling below a first threshold; and superimposing a direction in which the signal strength exceeds a second threshold, as first display, on second display being displayed. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a diagram illustrating an example of a communication apparatus  100  according to the present embodiment. 
         FIG.  2    is a block diagram illustrating an exemplary functional configuration of the communication apparatus  100  according to the embodiment. 
         FIG.  3    is a diagram illustrating a display example of a signal strength indicator  300  being measuring signal strength, according to the embodiment. 
         FIG.  4    is a diagram illustrating a display example of the signal strength indicator  300  upon completion of the measurement of the signal strength, according to the embodiment. 
         FIG.  5    is a diagram illustrating an example of superimposed display of the signal strength indicator  300  during a portrait mode, according to the embodiment. 
         FIG.  6    is a diagram illustrating an example of superimposed display of the signal strength indicator  300  during a landscape mode, according to the embodiment. 
         FIG.  7    is a diagram illustrating an example of changing a display position of the signal strength indicator  300  according to the embodiment. 
         FIG.  8    is a diagram illustrating an example of a method of notifying of signal strength by a vibration function according to the embodiment. 
         FIG.  9    is a flowchart illustrating a process of measurement of the signal strength and display processing, according to the embodiment. 
         FIG.  10    is a block diagram illustrating an exemplary hardware configuration of the communication apparatus  100  according to the embodiment. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The present embodiment will be described in detail below with reference to the drawings. Note that in the present description and the drawings, substantially the same portions are denoted by the same reference numerals, and redundant description thereof will be omitted. 
     Note that the description will be given in the following order. 
     1. Embodiment 
     1.1. Exemplary functional configuration 
     1.2. Details of functions 
     1.3. Functional process 
     2. Exemplary hardware configuration 
     3. Conclusion 
     1. Embodiment 
     «1.1. Exemplary Functional Configuration» 
     A communication apparatus  100  according to the present embodiment will be described first.  FIG.  1    is a diagram illustrating an example of the communication apparatus  100  according to the present embodiment. The communication apparatus  100  is a mobile terminal such as a smartphone or a tablet PC carried and used by a user. The communication apparatus  100  is connected to base stations  200 - 1  and  202 - 2  (hereinafter, collectively referred to as “base stations  200 ”) by wireless communication. 
     When a radio wave transmitted by each base station  200  is a radio wave in a high frequency band, the user himself/herself becomes an obstruction to each base station  200 , in some cases. For example, when the user stands between the base station  202 - 2  and the communication apparatus  100 , the user may be the obstruction to the base station  202 - 2 . In this case, even if the user stands at a position closer to the base station  202 - 2  than to the base station  202 - 1 , the base station  200 - 1  is higher than the base station  200 - 2  in a strength of the radio wave from each base station  200  received by the communication apparatus  100 , in some cases. 
     However, the radio waves from the base stations  200  are invisible, and the most users do not know where the base stations  200  are installed, thereby not being aware that the orientation of the user causes deterioration in communication quality. Therefore, as a matter of course, the user is not aware that the communication quality can be improved if the user turns in the spot. Therefore, in the present embodiment, the user is guided to turn in a direction in which high signal strength is received. 
     Next, an example of the functional configuration of the communication apparatus  100  according to the present embodiment will be described.  FIG.  2    is a block diagram illustrating an exemplary functional configuration of the communication apparatus  100  according to the present embodiment. As illustrated in  FIG.  2   , the communication apparatus  100  according to the present embodiment includes a communication unit  110 , a storage unit  120 , a determination unit  130 , a measurement unit  140 , a notification unit  150 , a display unit  160 , a vibration unit  170 , an output selection unit  180 , and a control unit  190 . 
     (Communication Unit  110 ) 
     The communication unit  110  according to the present embodiment is wirelessly connected to various communication networks such as the Internet, and transmits and receives information to and from the base stations  200 , other information processing devices, and the like on the network. 
     (Storage Unit  120 ) 
     The storage unit  120  according to the present embodiment is a storage area for temporarily or permanently storing various programs and data. For example, the storage unit  120  is configured to store programs and data for the communication apparatus  100  to perform various functions. As a specific example, the storage unit  120  may store a program and data for measuring and displaying the signal strength, a user interface (UI), management data for managing various settings and the like. As a matter of course, the above description is merely examples, and the type of data to be stored in the storage unit  120  is not particularly limited. 
     (Determination Unit  130 ) 
     The determination unit  130  according to the present embodiment determines a direction (orientation) in which the communication apparatus  100  is facing. Therefore, the determination unit  130  includes, for example, a magnetic sensor. Furthermore, the determination unit  130  is configured to include an acceleration sensor and a gyro sensor, and is also configured to determine the inclination and rotation direction of the communication apparatus  100  on the basis of acceleration and angular velocity measured by various sensors. 
     (Measurement Unit  140 ) 
     The measurement unit  140  according to the present embodiment measures the strength of the radio wave (signal strength) received by the communication unit  110 . The measurement unit  140  continues to measure the signal strength, but may change a measurement interval according to the change of the direction in which the communication apparatus  100  is facing, determined by the determination unit  130 . For example, in a case where it can be determined that the user turns in the spot to measure the signal strength on the basis of the change of the direction in which the communication apparatus  100  is facing, the measurement interval of the measurement unit  140  can be further reduced. Furthermore, in this case, when it can be determined, on the basis of the change of the direction in which the communication apparatus  100  faces, that the turning of the user is stopped and the measurement of the signal strength is finished, the measurement interval of the measurement unit  140  can be returned to the original measurement interval. 
     (Notification Unit  150 ) 
     The notification unit  150  according to the present embodiment is configured so that when the signal strength measured by the measurement unit  140  falls below a predetermined threshold (corresponding to “first threshold”), the user is notified of the signal strength. Although a method of notifying the user will be described later, the notification unit  150  is configured to notify the user by, for example, displaying a signal strength indicator  300  for displaying the signal strength, outputting a predetermined message in text or by sound, outputting a sound or vibration with a specific pattern, or blinking LED light. 
     (Display Unit  160 ) 
     The display unit  160  according to the present embodiment displays various visual information under the control of the control unit  190 . The display unit  160  may display, for example, an image, characters, or the like related to the application. Therefore, the display unit  160  according to the present embodiment includes various display devices such as a liquid crystal display (LCD) device and an organic light emitting diode (OLED) display device. 
     Furthermore, when the signal strength measured by the measurement unit  140  exceeds a predetermined threshold (corresponding to “second threshold”), the display unit  160  superimposes a direction in which the signal strength exceeds the predetermined threshold (corresponding to “first display”), on a display on the display unit  160  (e.g., display of any application, corresponding to “second display”). In addition, the display unit  160  displays a direction in which the measurement of the signal strength by the measurement unit  140  is completed. 
     In addition, the display unit  160  is configured to hide the first display described above, on the basis of an elapsed time, such as passage of a certain time period in which the communication apparatus  100  is kept facing in a direction in which the signal strength measured by the measurement unit  140  exceeds the predetermined threshold (corresponding to the “second threshold”). 
     In addition, the display unit  160  is configured to display the direction in which the signal strength exceeds the predetermined threshold, at a display position set in advance by the user. Note that the display position is allowed to be set for each application. Furthermore, the display position may be determined in advance depending on the type of application (classification such as video viewing application, game, browsing, etc.). In addition, when a predetermined application is being used, the display position may be adjusted by automatically determining a position where drawing is updated less frequently. Therefore, it is possible to change the display position of the first display described above, for each application being displayed on the display unit  160 , suppressing hindrance of the UX of the user of the communication apparatus  100 . 
     (Vibration Unit  170 ) 
     The vibration unit  170  according to the present embodiment vibrates by changing at least one of the strength and pattern of vibration depending on the signal strength received by the communication unit  110 . 
     (Output Selection Unit  180 ) 
     The output selection unit  180  according to the present embodiment selectively determines, on the basis of an application being displayed on the display unit  160 , whether to output notification of the signal strength to the user through the first display by the display unit  160 , described above, or through the vibration by the vibration unit  170 . This configuration makes it possible to selectively use the display, the vibration, or both thereof to notify the user of the signal strength, for each application being used with displayed on the display unit  160 , suppressing hindrance of the UX of the user of the communication apparatus  100 . 
     (Control Unit  190 ) 
     The control unit  190  according to the present embodiment controls each configuration of the communication apparatus  100 . In addition to the control of each configuration, the control unit  190  is configured to control, for example, each application displayed on the display unit  160 . 
     The exemplary functional configuration of the communication apparatus  100  according to the present embodiment has been described. Note that the functional configuration described above with reference to  FIG.  2    is merely an example, and the functional configuration of the communication apparatus  100  according to the present embodiment is not limited to such an example. For example, the communication apparatus  100  may not necessarily include all of the configurations illustrated in  FIG.  2   . The functional configuration of the communication apparatus  100  according to the present embodiment can be flexibly modified according to specifications and operations. 
     In addition, an arithmetic device such as a central proccessing unit (CPU) may perform the function of each component element by reading a control program from a storage medium such as a read only memory (ROM) or a random access memory (RAM) storing control programs in which process procedures to implement the functions of the component elements are described, and by interpreting and performing the program. Therefore, it is possible to appropriately change the configuration to be used, according to technical level whenever the present embodiment is carried out. Furthermore, an example of a hardware configuration of the communication apparatus  100  will be described later. 
     «1.2. Details of Functions» 
     Next, functions of the communication apparatus  100  according to the present embodiment will be described in detail. The communication apparatus  100  according to the present embodiment guides the user to turn in the direction in which high signal strength is received. As a specific method of guiding the user, the communication apparatus  100  measures the signal strength in a direction in which the communication apparatus  100  faces, and displays the measured signal strength via the signal strength indicator  300 . 
       FIG.  3    is a diagram illustrating a display example of the signal strength indicator  300  being measuring signal strength, according to the embodiment. The signal strength indicator  300  is configured to be displayed on the display unit  160 , for example, when the signal strength received and measured by the communication apparatus  100  falls below the predetermined threshold (corresponding to the “first threshold”). On the left side of  FIG.  3   , states of the signal strength indicator  300  and the user, at the beginning of the measurement of the signal strength are illustrated. In the signal strength indicator  300 , for example, a direction in which the user is facing is indicated by an arrow  310  through 360° around the user. 
     In the example illustrated on the left side of 
       FIG.  3   , the user holds the communication apparatus  100  facing in an appropriate direction, and the signal strength indicator  300  is displayed on the display unit  160 . Then, when the user turns clockwise or counterclockwise in the spot, the signal strength in a direction in which the communication apparatus  100  faces is measured. 
     In the center of  FIG.  3   , states of the signal strength indicator  300  and the user, during the measurement of the signal strength are illustrated. As illustrated in the center of  FIG.  3   , when the user turns 90° clockwise (or counterclockwise) in the spot from the state at the beginning of measurement, the communication apparatus  100  measures the signal strength during the 90° turning. In this case, as illustrated in the center of  FIG.  3   , a measurement completion range  320  is displayed on the signal strength indicator  300  so that the direction in which the measurement of the signal strength is completed can be visually recognized. Then, when the user further continues to turn in the spot, the direction in which the measurement of the signal strength is completed increases, and the measurement completion range  320  that increases as the measurement is completed is displayed, as illustrated on the right side of  FIG.  3   . 
     Next, display of the signal strength indicator  300  will be described, where the user has turned round in the spot and the measurement of the signal strength has been completed in all directions.  FIG.  4    is a diagram illustrating a display example of the signal strength indicator  300  upon completion of the measurement of the signal strength, according to the present embodiment. On the left side of  FIG.  4   , a display example of the signal strength indicator  300  upon completion of the measurement of the signal strength in all directions is illustrated. In this case, as illustrated on the left side of  FIG.  4   , the measurement completion range  320  is displayed through all directions. 
     Note that the measurement of the signal strength in all directions does not necessarily require measurement in all directions, and may be measurement, for example, in four directions of east, west, north, and south, or in only two directions of a direction in which the communication apparatus  100  faces at the start of measurement and a direction opposite to the direction by 180°. However, the limitation of the directions in which the signal strength is measured as described above reduces the granularity (e.g., fineness in a direction indicated as a direction in which high signal strength is received) of a result of the measurement. In addition, a learning model that is trained by training data having an input of results of the measurement (e.g., a direction for which the measurement is performed and the signal strength thereof) and having a correct output of the direction in which high signal strength is received may be used to estimate the direction in which high signal strength is received from the signal strength measured in a certain direction, not all direction. 
     When the measurement of the signal strength is completed, the direction in which high signal strength is received is displayed as a high-strength range  330 , as illustrated in the center of  FIG.  4   . In the example illustrated in the center of  FIG.  4   , the high-strength range  330  concentrates into a single location, but may disperses into a plurality of locations. Note that the high-strength range  330  may indicate a direction in which the signal strength is equal to or more than the predetermined threshold, or may indicate a direction in which higher signal strength is received, from among all directions measured. 
     Furthermore, the threshold may be a fixed value, or may be dynamically set referring to a surrounding radio wave environment. Alternatively, the threshold may be determined for each application being used on the communication apparatus  100 . This is because the communication quality required at that time differs depending on the application being used. For example, in a case where the application being used on the communication apparatus  100  is a video distribution application or the like requiring a large communication volume, a certain level of high communication quality is required, and thus the threshold is also determined to be higher. Meanwhile, in a case where the application being used on the communication apparatus  100  is a mail application, chat application, or the like requiring a low communication volume, the high communication quality as required in the above is not required, and thus the threshold is determined to be lower. 
     As illustrated in the center and on the right side of  FIG.  4   , when the high-strength range  330  is displayed on the signal strength indicator  300 , the user turns in the spot so that the communication apparatus  100  faces in the direction in which high signal strength is received (so that the arrow  310  falls within the high-strength range  330 . Therefore, the user can turn in the direction in which high signal strength is received. Note that as illustrated on the right side of  FIG.  4   , when a certain period of time has passed while the arrow  310  remains within the high-strength range  330 , the signal strength indicator  300  can be hidden. 
     Note that the display forms such as the shapes, colors, sizes, and transparencies of the signal strength indicator  300 , the arrow  310 , the measurement completion range  320 , and the high-strength range  330  illustrated in  FIGS.  3  and  4    are merely examples, and are not limited to the examples in  FIGS.  3  and  4   . 
     Next, superimposed display of the signal strength indicator  300  will be described.  FIG.  5    is a diagram illustrating an example of superimposed display of the signal strength indicator  300  during a portrait mode, according to the present embodiment. The example illustrated on the left side of  FIG.  5    shows a state in which the communication apparatus  100  is in the portrait mode (so-called vertical holding) and an application is being used with displayed on the display unit  160 . 
     For example, when the signal strength falls below the predetermined threshold in this state, the signal strength indicator  300  is displayed as illustrated on the right side of  FIG.  5   . At this time, the signal strength indicator  300  is superimposed on the application being displayed on the display unit  160 . Furthermore, the signal strength indicator  300  can also be displayed by a predetermined user operation (e.g., double tap operation at a predetermined position). This configuration makes it possible for the user to search for a direction in which higher signal strength is received, even if the signal strength does not fall below the predetermined threshold. 
     Note that the display position of the signal strength indicator  300  is configured to be changed to any position as described later. In addition, as described above, when the certain period of time has passed while the communication apparatus  100  is kept facing in the direction in which high signal strength is received, the signal strength indicator  300  can be hidden. Alternatively, the signal strength indicator  300  can be hidden by a user operation (e.g., long tap or flick operation on the signal strength indicator  300 ). 
     In addition, the signal strength indicator  300  in a landscape mode (so-called horizontal holding) of the communication apparatus  100  is also displayed as in the portrait mode.  FIG.  6    is a diagram illustrating an example of superimposed display of the signal strength indicator  300  during the landscape mode, according to the present embodiment. The display position of the signal strength indicator  300  can be changed between the landscape mode and the portrait mode. Therefore, for example, when the communication apparatus  100  is switched from the portrait mode to the landscape mode, the display position of the signal strength indicator  300  can also be switched depending on the display on the display unit  160 . 
     Next, changing the display position of the signal strength indicator  300  will be described.  FIG.  7    is a diagram illustrating an example of changing the display position of the signal strength indicator  300  according to the present embodiment. For example, the user performs a tap operation on the signal strength indicator  300  as illustrated on the left side of  FIG.  7   . Then, as illustrated on the right side of  FIG.  7   , the display position of the signal strength indicator  300  can be changed by performing a drag-and-drop operation to transfer the signal strength indicator  300  to a position to which the signal strength indicator  300  is desired to be moved. Note that changing the position of the indicator by the drag-and-drop operation is merely an example, and the display position of the signal strength indicator  300  can also be changed to any position by another operation such as a tap operation or flick operation. 
     Note that the display position is stored in the storage unit  120  of the communication apparatus  100 , and for subsequent display of the signal strength indicator  300 , the signal strength indicator  300  is displayed at the changed display position. In addition, the display position of the signal strength indicator  300  can be stored for each application used with displayed on the display unit  160 . Furthermore, the display position of the signal strength indicator  300  can be stored for each display format of the display unit  160 , that is, the portrait mode or the landscape mode. Furthermore, the user can also perform, for example, a pinch in/out operation for the signal strength indicator  300  to appropriately change the size of the signal strength indicator  300 . As described above, displaying the signal strength indicator  300  makes it possible for the user to freely customize the display of the signal strength indicator  300  so as not to obstruct the UX of the user of the communication apparatus  100  as much as possible. 
     In addition, some users may not desire to display the signal strength indicator  300  or for some applications being used on the communication apparatus  100 , the display of the signal strength indicator  300  may be not desired. In this case, the user can be notified of the signal strength by vibrations caused by a vibration function.  FIG.  8    is a diagram illustrating an example of the method of notifying of the signal strength by the vibration function according to the present embodiment. 
     In the example illustrated on the left side of  FIG.  8   , the user holds the communication apparatus  100  facing in an appropriate direction. When the signal strength received and measured by the communication apparatus  100  falls below the predetermined threshold, the vibration unit  170  vibrates in a specific pattern to notify the user that the signal strength has decreased. Therefore, when the user turns clockwise or counterclockwise in the spot, the signal strength in a direction in which the communication apparatus  100  faces is measured. 
     The center of  FIG.  8    shows that the user turns in the spot and the communication apparatus  100  faces in a direction in which low signal strength is received. In this case, the vibration unit  170  vibrates weakly to notify the user that the user is facing in the direction in which low signal strength is received. 
     The right side of  FIG.  8    shows that the user turns in the spot and the communication apparatus  100  faces in a direction in which high signal strength is received. In this case, the vibration unit  170  vibrates strongly to notify the user that the user is facing in the direction in which high signal strength is received. 
     Note that the example illustrated in  FIG.  8    is merely an example, and the vibration unit  170  can vibrate strongly when the communication apparatus  100  is facing in the direction in which low signal strength is received, or the vibration unit  170  can vibrate weakly (i.e., the vibrations are opposite in magnitude to those in the example illustrated in  FIG.  8   ) when the communication apparatus  100  faces in the direction in which high signal strength is received. Furthermore, the vibration unit  170  can vibrate by changing not only the strength of vibration but also the vibration pattern depending on the level of the signal strength. 
     Furthermore, the method of notifying of the signal strength by the vibration function as illustrated in  FIG.  8    can be used in combination with a method of notifying of the signal strength by the signal strength indicator  300 . In other words, the communication apparatus  100  is configured to notify the user of the direction in which high signal strength is received by vibration caused by the vibration function while displaying the signal strength indicator  300 . Note that whether notification of the signal strength to the user is output by the signal strength indicator  300 , by the vibration function as illustrated in  FIG.  8   , or by combination thereof can be set for each application. This configuration makes it possible to selectively use the methods of notifying the user, depending on the application being used on the communication apparatus  100 . The selective use of the methods of notifying the user means to notify the user, for example, by using vibration in a video viewing application, by using LED light or sound and voice in a game application, and by displaying the signal strength indicator  300  in other applications. 
     «1.3. Functional Process» 
     Next, a procedure of measurement of the signal strength and display processing will be described with reference to  FIG.  9   .  FIG.  9    is a flowchart illustrating a process of measurement of the signal strength and display processing, according to the present embodiment. 
     As illustrated in  FIG.  9   , the measurement unit  140  of the communication apparatus  100  measures the signal strength received (Step S 101 ). When the measured signal strength is equal to or more than the predetermined threshold (Step S 102 : No), the process returns to Step S 101 . 
     On the other hand, when the measured signal strength is lower than the predetermined threshold (Step S 102 : Yes), it is determined that the signal strength is low, and the notification unit  150  of the communication apparatus  100  notifies the user of the low signal strength (Step S 103 ). As described above, the notification to the user is, for example, display of the signal strength indicator  300 , output of text or voice of the predetermined message, output of the sound or vibration with a specific pattern, or blinking of LED light. Whether to perform what kind of notification is determined by the output selection unit  180  of the communication apparatus  100  on the basis of the application being used with displayed on the display unit  160  of the communication apparatus  100 . 
     When the user turns in the spot in response to the notification to the user by the notification unit  150 , the measurement unit  140  measures the signal strengths in all directions (Step S 104 ). Note that the signal strength may not necessarily be measured in all directions. 
     When the measurement of the signal strength is completed, the communication apparatus  100  notifies the user of the direction in which high signal strength is received (Step S 105 ). As described above, the notification here can also be performed by, for example, displaying the signal strength indicator  300 , outputting text or voice of the predetermined message, outputting the sound or vibration with a specific pattern, or blinking LED light. The notification method here is also determined by the output selection unit  180  on the basis of the application being used on the communication apparatus  100 . After Step S 105 , the present process ends. 
     2. Exemplary Hardware Configuration 
     Next, an exemplary hardware configuration of the communication apparatus  100  according to the present embodiment will be described.  FIG.  10    is a block diagram illustrating the exemplary hardware configuration of the communication apparatus  100  according to the present embodiment. Referring to  FIG.  10   , the communication apparatus  100  includes, for example, a processor  801 , ROM  802 , RAM  803 , a host bus  804 , a bridge  805 , an external bus  806 , an interface  807 , an input device  808 , an output device  809 , a storage  810 , a drive  811 , a connection port  812 , and a communication device  813 . Note that the hardware configuration shown here is merely an example, and some of the component elements may be omitted. In addition, a component element other than the component elements shown here may be further included. 
     (Processor  801 ) 
     The processor  801  functions, for example, as an arithmetic processing device or a control device, and controls all or part of the operation of each component element, on the basis of various programs recorded in the ROM  802 , the RAM  803 , the storage  810 , or a removable recording medium  901 . 
     (ROM  802  and RAM  803 ) 
     The ROM  802  is a unit that stores a program read by the processor  801 , data used for calculation, and the like. The RAM  803  temporarily or permanently stores, for example, a program read by the processor  801 , various parameters appropriately changing upon running the program, and the like. 
     (Host Bus  804 , Bridge  805 , External Bus  806 , and Interface  807 ) 
     The processor  801 , the ROM  802 , and the RAM  803  are connected to each other, for example, via the host bus  804  configured to transmit data at high speed. Meanwhile, the host bus  804  is connected to, for example, the external bus  806  configured to transmit data at a relatively low transmission rate, via the bridge  805 . In addition, the external bus  806  is connected to various component elements via the interface  807 . 
     (Input Device  808 ) 
     For the input device  808 , for example, a mouse, a keyboard, a touch panel, a button, a switch, a lever, and the like are used. Furthermore, for the input device  808 , a remote controller configured to transmit a control signal by using infrared ray or another radio wave is sometimes used. Furthermore, the input device  808  includes a voice sound input device such as a microphone. 
     (Output Device  809 ) 
     The output device  809  is a device that is configured to visually or audibly notify the user of acquired information, the device including a display device such as a cathode ray tube (CRT), LCD, or organic EL, an audio output device such as a speaker or headphone, a printer, a mobile phone, or a facsimile. Furthermore, the output device  809  according to the present embodiment includes various vibrating devices that are configured to output tactile stimulation. In addition, the output device  809  is a device, such as a smart speaker, exclusively outputting voice sound, and may have a text to speech (TTS) function of reading out a character string. 
     (Storage  810 ) 
     The storage  810  is a device for storing various data. For the storage  810 , for example, a magnetic storage device such as a hard disk drive (HDD), a semiconductor storage device, an optical storage device, a magneto-optical storage device, or the like is employed. 
     (Drive  811 ) 
     The drive  811  is, for example, a device that reads information recorded on the removable recording medium  901  such as a magnetic disk, optical disk, magneto-optical disk, or semiconductor memory, or that writes information in the removable recording medium  901 . 
     (Connection Port  812 ) 
     The connection port  812  is a port, such as a universal serial bus (USB) port, an IEEE1394 port, a small computer system interface (SCSI), an RS-232C port, or a port for connecting an externally connected device  902 , such as an optical audio terminal. 
     (Communication Device  813 ) 
     The communication device  813  is a communication device that is used for connection to various communication networks such as a mobile network, including the Internet and a mobile phone network by using a centimeter wave or a millimeter wave using a high frequency band, and that is, for example, a wireless LAN, a communication card for a wireless USB (WUSB), a router for optical communication, a modem for various communications, or the like. 
     (Removable Recording Medium  901 ) 
     The removable recording medium  901  is, for example, a DVD medium, a Blu-ray (registered trademark) medium, an HD DVD medium, various semiconductor storage media, and the like. As a matter of course, the removable recording medium  901  may be, for example, an IC card with a non-contact IC chip, an electronic device, or the like. 
     (Externally Connected Device  902 ) 
     The externally connected device  902  includes, for example, a printer, a portable music player, a digital camera, a digital camcorder, or an IC recorder. 
     3. Conclusion 
     As described above, the communication apparatus  100  includes the determination unit  130  that determines the direction in which the communication apparatus  100  faces, the measurement unit  140  that measures the signal strength indicating the strength of the radio wave received by the communication apparatus  100 , the notification unit  150  that notifies the user of the signal strength falling below the first threshold, and the display unit  160  that superimposes the direction in which the signal strength exceeds the second threshold, as the first display, on the second display being displayed. 
     This configuration makes it possible to guide the user to turn in the direction in which high signal strength is received, without hindering the UX of the user of the communication apparatus  100  using the high frequency band as much as possible. 
     Preferred embodiments of the present disclosure have been described above in detail with reference to the accompanying drawings, but the technical scope of the present disclosure is not limited to these examples. A person skilled in the art may obviously find various alternations and modifications within the technical concept described in claims, and it should be understood that the alternations and modifications will naturally come under the technical scope of the present disclosure. 
     Furthermore, the effects descried herein are merely explanatory or exemplary effects, and not limitative. In other words, the technology according to the present disclosure can achieve other effects that are apparent to those skilled in the art from the description herein, along with or instead of the above effects. 
     Note that the present technology can also employ the following configurations.
     (1)   

     A communication apparatus including: 
     a determination unit that determines a direction in which the communication apparatus faces; 
     a measurement unit that measures signal strength indicating strength of a radio wave received by the communication apparatus; 
     a notification unit that notifies a user of the signal strength falling below a first threshold; and 
     a display unit that superimposes a direction in which the signal strength exceeds a second threshold, as first display, on second display being displayed.
     (2)   

     The communication apparatus according to (1), wherein the display unit further displays a direction in which measurement of the signal strength is completed.
     (3)   

     The communication apparatus according to (1) or (2), wherein the display unit further hides the first display when the communication apparatus is kept facing in the direction in which the signal strength exceeds the second threshold, for a certain time.
     (4)   

     The communication apparatus according to any one of (1) to (3), wherein at least one of the first threshold and the second threshold is determined by an application being used on the communication apparatus.
     (5)   

     The communication apparatus according to any one of (1) to (4), wherein a display position of the first display is set in advance by the user.
     (6)   

     The communication apparatus according to (5), wherein 
     the display position of the first display is set in advance by the user, for each application, and 
     the display unit superimposes the first display on the display position set in advance, based on the second display of the application being displayed on the display unit.
     (7)   

     The communication apparatus according to any one of (1) to (6), further including a vibration unit that vibrates by changing at least one of the strength and pattern of vibration depending on the signal strength.
     (8)   

     The communication apparatus according to (7), further including an output selection unit that selectively determines, based on an application being displayed on the display unit, whether to output notification of the signal strength to the user through the first display by the display unit or through the vibration by the vibration unit.
     (9)   

     A method including: 
     by a communication apparatus, 
     determining a direction in which the communication apparatus faces; 
     measuring signal strength indicating strength of a radio wave received by the communication apparatus; 
     notifying a user of the signal strength falling below a first threshold; and 
     superimposing a direction in which the signal strength exceeds a second threshold, as first display, on second display being displayed.
     (10)   

     A program causing 
     a communication apparatus to perform: 
     determining a direction in which the communication apparatus faces; 
     measuring signal strength indicating strength of a radio wave received by the communication apparatus; 
     notifying a user of the signal strength falling below a first threshold; and 
     superimposing a direction in which the signal strength exceeds a second threshold, as first display, on second display being displayed. 
     REFERENCE SIGNS LIST 
       100  COMMUNICATION APPARATUS 
       110  COMMUNICATION UNIT 
       120  STORAGE UNIT 
       130  DETERMINATION UNIT 
       140  MEASUREMENT UNIT 
       150  NOTIFICATION UNIT 
       160  DISPLAY UNIT 
       170  VIBRATION UNIT 
       180  OUTPUT SELECTION UNIT 
       190  CONTROL UNIT 
       200  BASE STATION 
       300  SIGNAL STRENGTH INDICATOR 
       310  ARROW 
       320  MEASUREMENT COMPLETION RANGE 
       330  HIGH-STRENGTH RANGE