Radio terminal device, communication control method, and program

Abstract

To effectively find out a frequency of a signal that has to be received in accordance with a position of a user.SOLUTION: A radio terminal device comprises: a reception part that converts the received signal into a base band signal; a scan control part that scans a predetermined frequency band; a reception processing part that stops a scanning at a frequency that a squelch component of a predetermined threshold value or larger is detected by controlling the scan control part in the case where the squelch component of the predetermined threshold value or larger is detected; a position information acquisition part that acquires position information of an own device; a storage part that stores information in regard to the frequency for skipping the scan and position information indicating a registered point by corresponding them as scan skip frequency information; and a scan skip control part that determines whether or not the frequency when the scan is stopped is skipped on the basis of the scan skip frequency information and the position information of the own device when the scan is stopped. In the case where it is determined that the scan skip control part skips, the scan is restarted.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wireless terminal device, a communication control method, and a program. [Background technology]

[0002] There is a known technology that temporarily excludes frequencies or channels received by the scan function from the scan target. For example, Patent Document 1 discloses a technology that, after registering a frequency to be excluded from the scan target, skips the registered frequency and scans until a predetermined time has elapsed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-116796 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the frequencies and channels that are not required for reception often differ depending on the location of reception. If you skip registered frequencies and scan as in the past, depending on the location of reception, you may receive unnecessary signals because the frequencies you want to skip are not registered enough. In addition, you may skip frequencies of signals that you actually need to receive.

[0005] An object of the present invention is to provide a wireless terminal device, a communication control method, and a program that can efficiently find the frequency of a signal to be received depending on the user's location. [Means for solving the problem]

[0006] The wireless terminal device of the present invention comprises a receiving unit that converts a received signal into a baseband signal, a scan control unit that scans a predetermined frequency band, a receiving processing unit that detects squelch components from the baseband signal and, if a squelch component above a predetermined threshold is detected, controls the scan control unit to stop scanning at the frequency at which a squelch component above the predetermined threshold is detected, a location information acquisition unit that acquires location information of the device itself, a memory unit that associates information regarding the frequency at which scanning is skipped with location information indicating a registered point and stores the information as scan skip frequency information, and a scan skip control unit that, when scanning stops, determines whether to skip the frequency at which scanning stopped based on the scan skip frequency information and the location information of the device itself, and if the scan skip control unit determines to skip, scanning is resumed.

[0007] The communication control method of the present invention includes the steps of converting a received signal into a baseband signal, scanning a predetermined frequency band, detecting a squelch component from the baseband signal, and if a squelch component equal to or greater than a predetermined threshold is detected, stopping the scan at the frequency at which the squelch component equal to or greater than the predetermined threshold is detected, acquiring location information of the device itself, correlating information regarding the frequency at which scanning is to be skipped with location information indicating a registered point and storing the information as scan skip frequency information, and, when scanning stops, determining whether or not to skip the frequency at which scanning stopped based on the scan skip frequency information and the location information of the device itself, and if it is determined to skip, resuming scanning.

[0008] The program of the present invention causes a computer to execute the following steps: converting a received signal into a baseband signal; scanning a predetermined frequency band; detecting a squelch component from the baseband signal; and, if a squelch component equal to or greater than a predetermined threshold is detected, stopping scanning at the frequency at which the squelch component equal to or greater than the predetermined threshold is detected; acquiring location information of the device itself; correlating information regarding the frequency at which scanning is to be skipped with location information indicating a registered point and storing the information as scan skip frequency information; when scanning stops, determining whether or not to skip the frequency at which scanning stopped based on the scan skip frequency information and the location information of the device itself; and, if it is determined to skip, resuming scanning. Effect of the Invention

[0009] According to the present invention, convenience is improved by efficiently finding the frequency of a signal to be received depending on the user's location. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram showing an example of the configuration of a wireless terminal device according to the first embodiment. [Diagram 2] FIG. 2 is a diagram showing an example of a scan skip registration table according to the first embodiment. [Diagram 3] FIG. 3 is a diagram for explaining a method for setting a range in which a scan is skipped according to the first embodiment. [Figure 4] FIG. 4 is a diagram for explaining the scan skip operation according to the first embodiment. [Diagram 5] FIG. 5 is a flowchart showing the flow of the scan skip process according to the first embodiment. [Figure 6] FIG. 6 is a flowchart showing the flow of the scan skip registration process according to the first embodiment. [Figure 7] FIG. 7 is a flowchart showing the flow of the scan skip process according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to this embodiment, and in the following embodiments, the same components are designated by the same reference numerals, and duplicated explanations will be omitted.

[0012] [First embodiment] (Wireless terminal device) A configuration example of a wireless terminal device according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a block diagram showing a configuration example of a wireless terminal device according to the first embodiment.

[0013] 1, the wireless terminal device 10 includes an antenna 20, an audio input unit 22, an audio output unit 24, a display unit 26, an operation unit 28, a notification unit 30, a transmission unit 32, a reception unit 34, a GNSS (Global Navigation Satellite System) module 36, a storage unit 38, and a control unit 40. The wireless terminal device 10 is, for example, a commercial wireless device having a scan skip function. The wireless terminal device 10 may be, for example, a smartphone.

[0014] The antenna 20 receives communication signals transmitted by other wireless terminal devices 10. The antenna 20 transmits communication signals to other wireless terminal devices 10.

[0015] The voice input unit 22 detects the voice of the user who uses the wireless terminal device 10. The voice input unit 22 converts the detected voice into a voice signal. The voice input unit 22 is realized by, for example, a microphone.

[0016] The audio output unit 24 outputs audio. For example, the audio output unit 24 outputs the audio of a user who is using another wireless terminal device 10. For example, the audio output unit 24 outputs a beep sound. When outputting a beep sound, the audio output unit 24 functions as a notification unit 30. The audio output unit 24 is realized by, for example, a speaker.

[0017] The display unit 26 displays various information. The display unit 26 is realized by, for example, a liquid crystal display or an organic EL (Electro-Luminescence) display, etc. When the operation unit 28 is a touch panel, the display unit 26 and the operation unit 28 are integrally configured.

[0018] The operation unit 28 accepts various operations for the wireless terminal device 10. The operation unit 28 is realized by various input devices such as switches, buttons, keys, and a touch panel.

[0019] The notification unit 30 notifies the user. For example, the notification unit 30 notifies the user when the scan is stopped. The notification unit 30 is realized by, for example, an LED (Light Emitting Diode).

[0020] The transmitting unit 32 converts the audio signal output by the audio input unit 22 into a communication signal. The transmitting unit 32, under the control of the control unit 40, causes the antenna 20 to transmit the communication signal.

[0021] The receiving unit 34 receives a communication signal received by the antenna 20. The receiving unit 34 demodulates the communication signal received by the antenna 20 to generate a baseband signal. The receiving unit 34 outputs the generated baseband signal to the control unit 40.

[0022] The GNSS module 36 is configured with a GNSS receiver that receives GNSS signals from GNSS satellites, etc. The GNSS module 36 outputs the received GNSS signals to the control unit 40.

[0023] The storage unit 38 stores various types of information. For example, the storage unit 38 stores information such as the contents of calculations and programs of the control unit 40. For example, the storage unit 38 stores a scan skip registration table including information on frequencies at which scans are skipped. The scan skip registration table will be described later. For example, the storage unit 38 includes at least one of a RAM (Random Access Memory), a main storage device such as a ROM (Read Only Memory), and an external storage device such as a HDD (Hard Disk Drive).

[0024] The wireless terminal device 10 performs scanning on a predetermined frequency band. Here, scanning means detecting squelch components from a baseband signal of a predetermined frequency band while changing the frequency. If a squelch component equal to or greater than a predetermined threshold is detected while scanning, the scanning is paused. The frequency at which the scanning is paused is the frequency at which the squelch component equal to or greater than the predetermined threshold is detected. When the scanning is paused, a scan skip is performed based on the scan skip registration table and the current position information of the wireless terminal device 10. Here, the scan skip checks whether the frequency at which the scanning is paused is registered in the skip registration table TB, and if it is registered, if the frequency is within a predetermined range from the position registered in association with the registered frequency, the extraction of the audio signal, which is the processing after the extraction of the squelch signal at that frequency, is skipped.

[0025] Fig. 2 is a diagram showing an example of a scan skip registration table according to the first embodiment. As shown in Fig. 2, the scan skip registration table TB includes items such as "No.", "Frequency / Memory Channel Number", and "Location Information".

[0026] "No." indicates identification information for identifying the registered frequency.

[0027] "Frequency / memory channel number" indicates a scan skip frequency, which is a frequency at which scanning is skipped. The scan skip frequency can be registered by the user of the wireless terminal device 10 at his / her discretion.

[0028] "Location information" indicates the location information of the wireless terminal device 10 when the scan skip frequency was registered. The location information is expressed as longitude and latitude. "Latitude #1" and "Longitude #1" indicate the location information when it was registered the first time. "Latitude #2" and "Longitude #2" indicate the location information when it was registered the second time. In other words, "location information" may include location information of multiple locations.

[0029] That is, the scan skip registration table TB is information in which frequency information indicating a scan skip frequency is associated with location information indicating a registration point. The scan skip registration table TB is also called scan skip frequency information. For example, the scan skip registration table TB indicates that "433.220 MHz (megahertz)" is registered at a point with latitude of "35 degrees 30 minutes 54 seconds" and longitude of "139 degrees 33 minutes 35 seconds" and a point with latitude of "35 degrees 32 minutes 89 seconds" and longitude of "139 degrees 47 minutes 17 seconds."

[0030] The control unit 40 controls each unit of the wireless terminal device 10. The control unit 40 has, for example, an information processing device such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit), and a storage device such as a RAM or a ROM. The control unit 40 executes a program that controls the operation of the wireless terminal device 10. The control unit 40 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The control unit 40 may be realized by a combination of hardware and software.

[0031] The control unit 40 includes a reception processing unit 50, a scan control unit 52, a scan skip control unit 54, a notification processing unit 56, and a location information acquisition unit 58. The control unit 40 performs an initialization process when starting the scan and scan skip processes. In this initialization process, parameters such as a predetermined frequency band, which is the range of frequencies to be scanned, and a frequency at the start of scanning may be initialized.

[0032] The reception processing unit 50 performs signal processing on the baseband signal generated by the receiving unit 34. The reception processing unit 50 detects a squelch component from the baseband signal and extracts the squelch signal and the audio signal. When a squelch component whose signal strength is equal to or greater than a threshold is detected, the reception processing unit 50 may notify the scan control unit 52 to stop scanning.

[0033] The scan control unit 52 starts scanning and executes a frequency scan operation. The scan control unit 52 checks for squelch components at the frequency being scanned with the baseband signal. If a squelch component with a signal strength equal to or greater than a threshold is detected from the frequency to be scanned, the scan control unit 52 stops scanning and controls the reception processing unit 50 to start extracting an audio signal.

[0034] Here, the operation of scanning frequencies involves, for example, checking for squelch components while sweeping the frequency, and when a squelch component whose signal strength is equal to or greater than a threshold is detected, the scan is stopped and the reception processing unit 50 starts extracting the audio signal of that frequency. This operation is sometimes called a search. In addition, the operation of scanning frequencies involves, for example, checking for squelch components while changing a frequency determined under predetermined conditions, and when a squelch component whose signal strength is equal to or exceeds a threshold is detected, the scan is stopped and extraction of an audio signal of that frequency is started by the reception processing unit 50. Here, the frequency determined under predetermined conditions may be, for example, a frequency at a predetermined frequency interval or a plurality of preset frequencies.

[0035] The scan skip control unit 54 starts the scan skip process and determines whether or not to skip the frequency scan based on the scan skip registration table TB stored in the storage unit 38. For example, when the scan control unit 52 detects a squelch component with a signal strength equal to or greater than a threshold and stops the scan, the scan skip control unit 54 determines whether or not to skip the frequency scan based on frequency information indicating the frequency at the time when the scan was stopped. When the scan skip control unit 54 determines to skip the frequency scan, the scan control unit 52 resumes the scan without extracting an audio signal.

[0036] Specifically, the scan skip control unit 54 skips a frequency when the current location of the wireless terminal device 10 is registered in the skip registration table TB and is within a predetermined range from the location registered in association with the scan skip frequency that matches the frequency information indicating the frequency when the scan was stopped.

[0037] Fig. 3 is a diagram for explaining a method for setting a range in which a scan is skipped according to the first embodiment. A setting screen 26a shown in Fig. 3 is displayed on the display unit 26. On the setting screen 26a, the user can set a scan skip range in which the registered scan skip frequencies are scanned. The scan skip range is a range centered on the point where the scan skip frequency is registered.

[0038] In the example shown in FIG. 3, the scan skip ranges are "Off", "5km", "10km", "15km", "20km", "50km", and "100km". The user can set the scan skip range by moving the icon 261 to a desired range. For example, when the scan skip range is set to "5km", the scan skip control unit 54 skips the scan skip frequency when the current location of the wireless terminal device 10 is located within a range of 5km from the location where the scan skip frequency is registered in the skip registration table TB. Also, when the scan skip frequency is set to "Off", the scan skip control unit 54 does not perform a scan skip based on the current location of the wireless terminal device 10.

[0039] Also, like "433.220MHz" in the scan skip registration table TB shown in Fig. 2, multiple pieces of location information may be registered for one frequency. In this case, the position indicated by "latitude #1" and "longitude #1" and the position indicated by "latitude #2" and "longitude #2" that is closer to the current position is adopted as the registered point for determining whether the current position is within the scan skip range. For example, when "latitude #1" and "longitude #1" are closer to the current position than "latitude #2" and "longitude #2", the scan skip control unit 54 skips the scan if the current position is located within the scan skip range from the position indicated by "latitude #1" and "longitude #1".

[0040] The notification processing unit 56 controls at least one of the audio output unit 24 and the notification unit 30 to audibly or visually notify the user. For example, the notification processing unit 56 audibly or visually notifies the user when the scan by the scan control unit 52 is stopped. For example, the notification processing unit 56 audibly or visually notifies the user when a frequency for skipping scanning is registered.

[0041] The position information acquisition unit 58 acquires current position information of the wireless terminal device 10. The position information acquisition unit 58 calculates the current latitude and longitude of the wireless terminal device 10 based on the GNSS signal received by the GNSS module 36, for example.

[0042] (Scan skip operation) The scan skip operation according to the first embodiment will be described with reference to Fig. 4. Fig. 4 is a diagram for explaining the scan skip operation according to the first embodiment.

[0043] Fig. 4 shows a frequency display screen displayed on the display unit 26. In the example shown in Fig. 4, the skip frequency for skipping scanning is 20 kHz. In this case, the scan control unit 52 scans frequencies in 20 kHz steps starting from 433.200 MHz. In the example shown in Fig. 4, it is assumed that 433.220 MHz is registered as the scan skip frequency. In the example shown in Fig. 4, it is assumed that the current location of the wireless terminal device 10 is within the scan skip range.

[0044] First, when the frequency is set to 433.200 MHz and the operation unit 28 receives a predetermined operation from the user, the scan control unit 52 starts scanning the frequency (step S1), and then proceeds to step S2.

[0045] The next frequency after 433.200 MHz is 433.220 MHz, but since 433.220 MHz is a scan skip frequency, the scan skip control unit 54 skips 433.220 MHz. In this case, the scan control unit 52 scans the frequency of 433.240 MHz (step S2). Then, the process proceeds to step S3.

[0046] Thereafter, the scan control unit 52 scans the frequency of 433.260 MHz (step S3), scans the frequency of 433.280 MHz (step S4), and scans the frequency of 433.300 MHz (step S5).

[0047] 4, an example has been described in which scanning of the 433.220 MHz frequency is skipped because the current location of the wireless terminal device 10 is within the scan skip range. When the current location of the wireless terminal device 10 is outside the scan skip range, the notification processing unit 56 may, for example, change the color of 433.220 MHz displayed on the display unit 26 to a different color from normal to notify that the location is outside the scan skip range.

[0048] (Scan skip processing) The flow of the scan skip processing according to the first embodiment will be described with reference to Fig. 5. Fig. 5 is a flowchart showing the flow of the scan skip processing according to the first embodiment.

[0049] First, the control unit 40 is switched to the scan mode state by operating the operation unit 28 (for example, a VFO (Variable Frequency Oscillator) button). When starting the scan skip process, the control unit 40 executes an initialization process (step S10). Then, the process proceeds to step S12.

[0050] The scan control unit 52 starts scanning and searching for a frequency (step S12), and the scan skip control unit 54 starts a scan skip process, and the process proceeds to step S14.

[0051] The scan control unit 52 determines whether the signal strength of the squelch component of the searched frequency is equal to or greater than the threshold (step S14). If it is determined that the signal strength of the squelch component is not equal to or greater than the threshold (step S14; No), the process proceeds to step S16. If it is determined that the signal strength of the squelch component is equal to or greater than the threshold (step S14; Yes), the process proceeds to step S18.

[0052] If it is determined as No in step S14, the scan control unit 52 continues searching for the frequency (step S16), and then the process proceeds to step S14.

[0053] If the result of step S14 is Yes, the scan control unit 52 suspends the frequency search (step S18), and then the process proceeds to step S20.

[0054] The scan skip control unit 54 judges whether the frequency determined to have a squelch component whose signal strength is equal to or greater than the threshold is a scan skip frequency (step S20). Specifically, the scan skip control unit 54 judges whether the frequency is a scan skip frequency based on the scan skip registration table TB stored in the storage unit 38. If the frequency determined to have a squelch component whose signal strength is equal to or greater than the threshold is a scan skip frequency (step S20; Yes), the process proceeds to step S22. If the frequency determined to have a squelch component whose signal strength is equal to or greater than the threshold is not determined to be within the scan skip range (step S20; No), the process proceeds to step S24.

[0055] If the result of the determination in step S20 is Yes, the scan skip control unit 54 determines whether or not the current location of the wireless terminal device 10 is within the scan skip range (step S22). Specifically, the scan skip control unit 54 determines whether or not the current location of the wireless terminal device 10 is within the scan skip range based on the current location of the wireless terminal device 10 and the location information registered in the scan skip registration table TB stored in the storage unit 38 and associated with a frequency matching the frequency information indicating the frequency when the scan was stopped. For example, if the scan skip setting range is registered as 5 km, when the current location of the wireless terminal device 10 is within 5 km from the registered point, which is the location information associated with the scan skip frequency matching the frequency information indicating the frequency when the scan was stopped, the scan skip control unit 54 determines that the current location of the wireless terminal device 10 is within the scan skip range. The current location of the wireless terminal device 10 is acquired by the location information acquisition unit 58 constantly or at a predetermined interval. If the current position of the wireless terminal device 10 is not determined to be within the scan skip range (step S22; No), the process proceeds to step S24. If it is determined that the current location of the wireless terminal device 10 is within the scan skip range (step S22; Yes), the process proceeds to step S34.

[0056] If the result of the determination in step S22 is No, the reception processing unit 50 controls the receiving unit 34 to start receiving the communication signal (step S24). Specifically, the reception processing unit 50 controls the receiving unit 34 to convert the received communication signal into a baseband signal. Then, the process proceeds to step S26.

[0057] The reception processing unit 50 determines whether or not the baseband signal includes a busy signal (step S26). If it is determined that the baseband signal includes a busy signal (step S26; Yes), the process proceeds to step S28. If it is not determined that the baseband signal includes a busy signal (step S26; No), the process proceeds to step S34.

[0058] If it is determined that the result of step S26 is Yes, the control unit 40 determines whether or not a scan skip write operation for skipping a scan has been detected for the frequency determined to include a busy signal in the baseband signal (step S28). The user can operate the operation unit 28 to perform a scan skip write operation. If it is determined that a scan skip write operation has been detected (step S28; Yes), the process proceeds to step S30. If it is not determined that a scan skip write operation has been detected (step S28; No), the process proceeds to step S32.

[0059] If it is determined as Yes in step S28, the control unit 40 executes a scan skip frequency registration process (step S30). The scan skip frequency registration process will be described in detail later.

[0060] If it is determined that the result of step S28 is No, the control unit 40 determines whether or not a predetermined time has elapsed (step S32). Specifically, the control unit 40 determines whether or not a predetermined waiting time has elapsed before searching for the next frequency. If it is determined that the predetermined time has elapsed (step S32; Yes), the process proceeds to step S34. If it is not determined that the predetermined time has elapsed (step S32; No), the process proceeds to step S28.

[0061] If it is determined that the scan mode is on (step S34), the control unit 40 determines whether the scan mode is on (step S34; Yes). If it is determined that the scan mode is on (step S34; No), the control unit 40 proceeds to step S36. If it is not determined that the scan mode is on (step S34; No), the process of FIG. 5 is terminated.

[0062] If it is determined as Yes in step S34, the scan control unit 52 restarts the frequency search (step S36), and then the process proceeds to step S14.

[0063] (Scan skip frequency registration process) The scan skip frequency registration process according to the first embodiment will be described with reference to Fig. 6. Fig. 6 is a flowchart showing the flow of the scan skip registration process according to the first embodiment.

[0064] The scan control unit 42 acquires frequency information indicating a frequency (step S40). Specifically, the scan control unit 42 acquires frequency information indicating a frequency that is currently paused. Then, the process proceeds to step S42.

[0065] The position information acquisition unit 58 acquires current position information of the wireless terminal device 10 (step S42). Specifically, the position information acquisition unit 58 calculates the latitude and longitude of the current position of the wireless terminal device 10 based on the GNSS signal received by the GNSS module 36. Then, the process proceeds to step S44.

[0066] The control unit 40 associates the frequency information with the position information and stores the associated information as scan skip frequency information in the storage unit 38 (step S44). Then, the process of FIG. 6 ends.

[0067] As described above, in the first embodiment, when the current location is within a predetermined range from the point where the scan skip frequency is registered, the scan skip frequency is skipped and the next frequency is scanned. This makes it possible to determine the frequency that does not need to be received according to the current location, improving convenience.

[0068] [Second embodiment] A second embodiment will now be described. In the second embodiment, a squelch component is detected while changing the frequency in predetermined frequency increments, and it is determined whether or not to skip scanning.

[0069] (Scan skip processing) The scan skip processing according to the second embodiment will be described with reference to Fig. 7. Fig. 7 is a flowchart showing the flow of the scan skip processing according to the second embodiment.

[0070] The process of step S50 is the same as the process of step S10 shown in FIG. 5, and therefore a description thereof will be omitted.

[0071] The scan control unit 52 starts scanning and acquires a frequency (step S52). Specifically, the scan control unit 52 acquires the first frequency when scanning a predetermined frequency band at a predetermined interval. The scan skip control unit 54 also starts a scan skip process. Then, the process proceeds to step S54.

[0072] The scan control unit 52 determines whether the signal strength of the squelch component of the acquired frequency is equal to or greater than a threshold (step S54). If it is determined that the signal strength of the squelch component is equal to or greater than the threshold (step S54; Yes), the process proceeds to step S56. If it is not determined that the signal strength of the squelch component is equal to or greater than the threshold (step S54; No), the process proceeds to step S72.

[0073] The processes from step S56 to step S72 are the same as the processes from step S18 to step S34 shown in FIG. 5, respectively, and therefore will not be described.

[0074] If the result of the determination in step S72 is Yes, the scan control unit 52 switches to the next frequency and continues the scan (step S74). Specifically, the scan control unit 52 switches to a frequency obtained by adding 20 kHz to the frequency acquired in step S52, for example, and continues the scan. Then, the process in FIG. 7 ends.

[0075] As described above, in the second embodiment, when the current location is within a predetermined range from the point where the scan skip frequency is registered, the scan skip frequency is skipped and the next frequency is scanned. This makes it possible to determine frequencies that do not need to be received according to the current location, improving convenience.

[0076] Each component of each device shown in the figure is a functional concept, and does not necessarily have to be physically configured as shown in the figure. In other words, the specific form of distribution and integration of each device is not limited to that shown in the figure, and all or part of them can be functionally or physically distributed and integrated in any unit according to various loads, usage conditions, etc. This distribution and integration configuration may be performed dynamically.

[0077] Although the embodiments of the present invention have been described above, the present invention is not limited to the contents of these embodiments. The above-described components include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the above-described components can be appropriately combined. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the spirit of the above-described embodiments. [Explanation of symbols]

[0078] 10 Wireless terminal equipment 20 Antenna 22 Audio input section 24 Audio output section 26 Display section 28 Control section 30. Notification Department 32 Transmitter 34 Receiving section 36 GNSS Module 38 Memory section 40 Control section 50 Receiving processing section 52 Scan control section 54 Scan skip control section 56 Notification processing section 58 Location information acquisition section

Claims

1. A receiver that converts a received signal into a baseband signal; A scan control unit that scans a predetermined frequency band; a reception processing unit that detects squelch components from the baseband signal, and when a squelch component equal to or greater than a predetermined threshold is detected, controls the scan control unit to stop scanning at the frequency at which the squelch component equal to or greater than the predetermined threshold is detected; A location information acquisition unit that acquires location information of the device itself; a storage unit that stores information about frequencies for which scanning is skipped and location information indicating a registered location in association with each other as scan skip frequency information; a scan skip control unit that determines whether or not to skip a frequency when scanning is stopped based on the scan skip frequency information and location information of the own device when scanning is stopped; Equipped with When the scan skip control unit determines to skip, the scan is resumed. Wireless terminal device.

2. The scan control unit performs scanning while changing a frequency determined under predetermined conditions.

2. The wireless terminal device according to claim 1.

3. When determining whether to skip the frequency when the scan stopped, the scan skip control unit calculates the shortest distance among distances between the location information of the device itself and a plurality of location information items stored in the storage unit and associated with a frequency that matches the frequency when the scan stopped, and if the calculated distance is within a predetermined distance, skips the frequency when the scan stopped.

3. The wireless terminal device according to claim 1 or 2.

4. converting the received signal into a baseband signal; scanning a predetermined frequency band; detecting a squelch component from the baseband signal, and when detecting a squelch component equal to or greater than a predetermined threshold, stopping scanning at the frequency at which the squelch component equal to or greater than the predetermined threshold is detected; acquiring location information of the own device; a step of storing information on frequencies for skipping scans as scan skip frequency information in association with location information indicating a registration point; When the scan is stopped, determining whether or not to skip the frequency at which the scan was stopped based on the scan skip frequency information and location information of the own device; if it is determined that the scan should be skipped, restarting the scan; A communication control method comprising:

5. converting the received signal into a baseband signal; scanning a predetermined frequency band; detecting a squelch component from the baseband signal, and when detecting a squelch component equal to or greater than a predetermined threshold, stopping scanning at the frequency at which the squelch component equal to or greater than the predetermined threshold is detected; acquiring location information of the own device; a step of storing information on frequencies for skipping scans as scan skip frequency information in association with location information indicating a registration point; When the scan is stopped, determining whether or not to skip the frequency at which the scan was stopped based on the scan skip frequency information and location information of the own device; if it is determined that the scan should be skipped, restarting the scan; A program that causes a computer to execute the following.

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