Wireless communication device and wireless communication method

Abstract

To provide a wireless communication device and a wireless communication method that appropriately receive various broadcasts according to a reception environment.SOLUTION: A wireless communication device 10 includes: a position information acquisition part 22 that acquires position information of its own communication device; a reception part 20 that receives data; an acquisition part 40 that acquires a reception time, reception information, and a voice signal from the data received by the reception part, and acquires the reception time of its own device when the data is received; a power supply determination part 42 that determines whether a power supply supplying power to its own communication device is an AC power supply or a DC power supply; a reception control part 44 that sets a reception condition; and a storage part 28 that stores the first reception condition and a plurality of other reception conditions different from the first reception condition. The reception control part switches from the first reception condition to a second reception condition corresponding to the predetermined condition among the plurality of other reception conditions when it is determined that the power supply for supplying the power to the own communication device is the DC power supply and at least one of the remaining battery level of the DC power supply, the reception time, and the reception information satisfies the predetermined condition.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a wireless communication device and a wireless communication method. [Background technology]

[0002] There are known techniques for reducing the power consumption of wireless communication devices. For example, Patent Document 1 discloses a technique that can save power for a predetermined process when the reception state is good. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5125482 Summary of the Invention [Problem to be solved by the invention]

[0004] Residential receivers that receive regular broadcasts, emergency broadcasts, and other information from local governments are installed in homes. In the event of a disaster, residents often take their residential receivers out of their homes to receive various broadcasts. In such cases, it is necessary to be able to receive various broadcasts properly while minimizing battery consumption in the residential radio.

[0005] An object of the present disclosure is to provide a wireless communication device and a wireless communication method that can appropriately receive various broadcasts depending on the reception environment. [Means for solving the problem]

[0006] The wireless communication device of the present disclosure comprises a location information acquisition unit that acquires location information of the communication device itself, a receiving unit that receives data from another communication device, an acquisition unit that acquires reception information and an audio signal from the data received by the receiving unit and acquires the reception time of the communication device itself when the data is received, a power source determination unit that determines whether the power source supplying power to the communication device itself is an AC power source or a DC power source, a reception control unit that sets reception conditions that are setting conditions at the time of reception for the receiving unit, and a memory unit that stores a first reception condition that is the reception condition under normal conditions and multiple other reception conditions that are different from the first reception condition as a reception condition table, and when the reception control unit determines that the power source supplying power to the communication device itself is the DC power source and at least one of the remaining battery charge of the DC power source, the reception time, and the reception information satisfies a predetermined condition, the reception control unit switches from the first reception condition to a second reception condition among the multiple other reception conditions that corresponds to the predetermined condition.

[0007] The wireless communication method disclosed herein includes the steps of: acquiring location information of the communication device by a receiving unit; receiving data from another communication device; acquiring reception information and an audio signal from the data received by the receiving unit and acquiring the reception time of the communication device when the data was received; determining whether the power source supplying power to the communication device is an AC power source or a DC power source; setting reception conditions for the receiving unit as setting conditions during reception; storing a first reception condition, which is the reception condition under normal conditions, and multiple other reception conditions different from the first reception condition as a reception condition table; and, when it is determined that the power source supplying power to the communication device is the DC power source and at least one of the remaining battery charge of the DC power source, the reception time, and the reception information satisfies a predetermined condition, switching from the first reception condition to a second reception condition among the multiple other reception conditions that corresponds to the predetermined condition. [Effects of the Invention]

[0008] According to the present disclosure, various broadcasts can be appropriately received depending on the reception environment. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication device according to an embodiment. [Figure 2] FIG. 2 is a diagram showing an example of a reception condition table for normal reception conditions according to the embodiment. [Figure 3] FIG. 3 is a diagram showing an example of a reception condition table of emergency reception conditions according to the embodiment. [Figure 4] FIG. 4 is a diagram showing an example of a reception condition table of periodic reception conditions according to the embodiment. [Figure 5] FIG. 5 is a diagram showing an example of a reception condition table of preferential reception conditions according to the embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of a reception condition table for a low battery level reception condition according to the embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of a reception condition table of interference reception conditions according to the embodiment. [Figure 8] FIG. 8 is a diagram illustrating an example of setting values ​​set for the setting items according to the embodiment. [Figure 9] FIG. 9 is a diagram illustrating an example of a reception table according to the embodiment. [Figure 10] FIG. 10 is a flowchart showing the flow of processing for generating a reception table according to the embodiment. [Figure 11] FIG. 11 is a diagram for explaining reception history information according to the embodiment. [Figure 12] FIG. 12 is a flowchart showing the flow of the update process of the reception table and the reception condition table according to the embodiment. [Figure 13] FIG. 13 is a flowchart showing the flow of the reception condition change process according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that the present disclosure is not limited to these embodiments, and in the following embodiments, the same components are designated by the same reference numerals, and redundant description will be omitted.

[0011] [Embodiment] (wireless communication device) A wireless communication device according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing an example of the configuration of a wireless communication device according to an embodiment.

[0012] As shown in Fig. 1, the wireless communication device 10 includes a receiving unit 20, a GNSS (Global Navigation Satellite System) receiving unit 22, an input unit 24, an output unit 26, a storage unit 28, and a control unit 30. The wireless communication device 10 is a door-to-door radio installed in a home to receive emergency broadcasts broadcast by a local government in the event of a disaster or the like. The wireless communication device 10 is normally connected to an AC power source (alternating current power source) such as a household power source to receive power. When the wireless communication device 10 is taken out of the home in the event of a disaster or the like, it receives power from a DC power source (direct current power source) such as a battery installed inside.

[0013] The receiving unit 20 receives various data from other communication devices and is composed of, for example, an antenna and a receiving circuit.

[0014] The GNSS receiving unit 22 is configured with a GNSS receiver that receives GNSS signals from GNSS satellites, etc. The GNSS receiving unit 22 is also called a position information acquiring unit.

[0015] The input unit 24 accepts various input operations for the wireless communication device 10. The input unit 24 includes, for example, a button, a switch, and the like.

[0016] The output unit 26 includes a speaker that outputs various sounds, an LED (Light Emitting Diode) that emits light, etc. The output unit 26 may also include a display unit that displays video.

[0017] The storage unit 28 stores various types of information. The storage unit 28 stores information such as the contents of calculations performed by the control unit 30 and programs. The storage unit 28 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 an HDD (Hard Disk Drive).

[0018] The storage unit 28 stores a reception condition table indicating reception conditions set in the receiving unit 20.

[0019] FIG. 2 is a diagram showing an example of a reception condition table for normal reception conditions according to the embodiment. The reception condition table TB1 represents reception conditions that are set in the receiving unit 20 during normal times. As shown in FIG. 2, the reception condition table TB1 includes items such as "setting items" and "setting values." The "setting items" represent parameters to be set as reception conditions. The "setting values" represent values ​​to be set for the corresponding setting items. The "setting items" include a received signal strength indicator (RSSI) threshold value, a flame synchronization word (FSW) allowable number of bits, and an FWS determination time. The parameters included in the "setting items" are not limited to these.

[0020] The RSSI threshold indicates the threshold level of radio wave strength at which a signal is determined to be received. If the RSSI threshold is high, the signal will be received only when it is strong, resulting in low power consumption. If the RSSI threshold is low, the signal will be received even when it is weak, resulting in high power consumption.

[0021] The FSW allowable bit count represents the number of bits that can be tolerated as a difference between the FSW bit count and the number of received data. For example, if the FSW allowable bit count is "5 bits," a data difference of up to 5 bits is tolerated. If the FSW allowable bit count is large, the number of false positives increases but the number of missed data decreases. If the FSW allowable bit count is small, the number of false positives decreases but the number of missed data increases.

[0022] The FSW determination time represents the determination time required to determine that the data is frame synchronized data to be received. If the FSW determination time is long, it is determined that the data has been received if the number of frames matches for a long period of time. In this case, the number of determinations increases, so the number of false receptions decreases. However, power consumption increases because the processing time is long. If the FSW determination time is short, it is determined that the data has been received if the number of frames matches for a short period of time. In this case, the number of determinations decreases, so the number of false receptions increases. However, power consumption decreases because the processing time is reduced.

[0023] As shown in the reception condition table TB1, the normal reception conditions are an RSSI threshold of -90 [dBm (decibels milliwatts)], an FSW allowable bit count of 3 [bits], and an FSW determination time of 180 [msec (milliseconds)]. Note that the setting values ​​of each parameter under the normal reception conditions are not limited to these.

[0024] FIG. 3 is a diagram showing an example of a reception condition table for emergency reception conditions according to an embodiment. The reception condition table TB2 represents reception conditions set in the receiving unit 20 when receiving an emergency broadcast. As shown in the reception condition table TB2, the emergency reception conditions are an RSSI threshold of −120 [dBm], an FSW allowable bit count of 5 [bits], and an FSW determination time of 90 [msec]. That is, when receiving an emergency broadcast, the RSSI value is made smaller, the FSW allowable bit count is made larger, and the FSW determination time is made shorter compared to normal times. This allows the receiving unit 20 to avoid missing the reception of an emergency broadcast, which is an important broadcast. Note that the setting values ​​of each parameter when the emergency reception conditions are met are not limited to these.

[0025] FIG. 4 is a diagram showing an example of a reception condition table for periodic reception conditions according to an embodiment. The reception condition table TB3 represents the reception conditions set in the receiving unit 20 when receiving a periodic broadcast. As shown in the reception condition table TB3, the periodic reception conditions are an RSSI threshold of -120 [dBm], an FSW allowable number of bits of 5 [bits], and an FSW determination time of 180 [msec]. In other words, when receiving a periodic broadcast, the RSSI value is made smaller and the FSW allowable number of bits is made larger than usual. This allows the receiving unit 20 to reliably receive periodic broadcasts that are broadcast periodically. Note that the setting values ​​of each parameter for the periodic reception conditions are not limited to these.

[0026] FIG. 5 is a diagram showing an example of a reception condition table for priority reception conditions according to an embodiment. The reception condition table TB4 represents reception conditions set in the receiving unit 20 when receiving priority broadcasts. As shown in the reception condition table TB4, the priority reception conditions are an RSSI threshold of -120 [dBm], an FSW allowable bit count of 3 [bits], and an FSW determination time of 180 [msec]. In other words, when receiving priority broadcasts, the RSSI value is set smaller than normal. This allows the receiving unit 20 to avoid missing important cable broadcasts. Note that the setting values ​​of each parameter for priority reception conditions are not limited to these.

[0027] FIG. 6 is a diagram showing an example of a reception condition table for a low battery reception condition according to the embodiment. The reception condition table TB5 represents reception conditions set in the receiving unit 20 when the remaining battery power falls below a predetermined value. As shown in the reception condition table TB5, the priority reception conditions are an RSSI threshold of −60 dBm, an FSW allowable bit count of 3 bits, and an FSW determination time of 90 msec. In other words, when the remaining battery power falls below a predetermined value, the RSSI value is increased and the FSW determination time is decreased compared to normal. This allows the receiving unit 20 to reduce battery consumption in consideration of the remaining battery power and avoid receiving broadcasts that are less necessary. Note that the setting values ​​of each parameter for the low battery reception condition are not limited to these.

[0028] FIG. 7 is a diagram showing an example of a reception condition table for jamming reception conditions according to the embodiment. The reception condition table TB6 represents reception conditions set in the receiving unit 20 when jamming radio waves exceed a predetermined value. As shown in the reception condition table TB6, the priority reception conditions are an RSSI threshold of −90 dBm, an FSW allowable number of bits of 5 bits, and an FSW determination time of 270 msec. In other words, when jamming radio waves exceed a predetermined value, the FSW allowable number of bits and the FSW determination time are increased compared to normal times. This allows the receiving unit 20 to avoid erroneous reception due to jamming radio waves. Note that the setting values ​​of each parameter under jamming reception conditions are not limited to these.

[0029] 3 to 7, in this embodiment, the values ​​of the RSSI threshold level, the number of FSW allowable bits, and the FSW determination time are changed according to the reception conditions. Fig. 8 is a diagram showing an example of setting values ​​set in the setting items according to this embodiment.

[0030] 8 shows a setting value table TB7 in which the RSSI threshold level, the number of FSW allowable bits, and the FSW determination time are associated with setting values. As shown in the setting value table TB7, in this embodiment, each setting item is set to one of three values: "large," "medium," and "small."

[0031] The RSSI threshold level is set to -120 [dBm] for "small," -90 [dBm] for "medium," and -60 [dBm] for "large."

[0032] The number of FSW allowable bits is set to 1 [bit] for "small", 3 [bit] for "medium", and 5 [bit] for "large".

[0033] The FSW judgment time is set to 90 [msec] for "Small," 180 [msec] for "Medium," and 270 [msec] for "Large."

[0034] The setting values ​​shown in the setting value table TB7 are merely examples and are not limited to these. Furthermore, in the setting value table TB7, each setting value is shown in three levels: "large," "medium," and "small," but the present invention is not limited to these levels. Each setting value may be set in two levels, or in four or more levels. Furthermore, each setting value may be changed depending on the location where the wireless communication device 10 is used. In this case, for example, each setting value may be changed depending on the location received by the GNSS receiver 22.

[0035] Although the storage unit 28 has been described as storing six reception tables, namely, reception condition table TB1 to reception condition table TB6, which correspond to reception conditions, the present disclosure is not limited to this. The number of reception tables stored in the storage unit 28 may be seven or more, or five or less.

[0036] The storage unit 28 may store a reception table that associates time periods with reception conditions. Fig. 9 is a diagram showing an example of the reception table according to the embodiment. As shown in Fig. 9, the reception table TB8 includes items such as "time period" and "reception conditions."

[0037] The "time period" indicates the time set for the associated reception condition. The "reception condition" includes the normal reception condition, the periodic reception condition, and the priority reception condition. An example of the reception table TB8 indicates that the reception condition set in the receiving unit 20 is the normal reception condition between 0:00 and 8:30.

[0038] Specifically, as will be described later, the reception table TB8 may be generated based on, for example, a reception history for the past week or so. The reception table TB8 may be updated, for example, at predetermined intervals (for example, once a week). The reception table TB8 may be updated, for example, according to the location where the wireless communication device 10 is used.

[0039] Returning to FIG. 1, the control unit 30 controls each unit of the wireless communication device 10. The control unit 30 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 30 executes a program that controls the operation of the wireless communication device 10 according to the present invention. The control unit 30 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 30 may be realized by a combination of hardware and software.

[0040] The control unit 30 includes an acquisition unit 40, a power supply determination unit 42, a reception control unit 44, and an output control unit 46.

[0041] The acquisition unit 40 acquires various types of information. For example, the acquisition unit 40 acquires reception time information, reception information, and audio signals included in the data received by the reception unit 20. For example, the acquisition unit 40 acquires GNSS signals received by the GNSS reception unit 22.

[0042] The power supply determination unit 42 determines whether the power supply supplying power to the wireless communication device 10 is an AC power supply or a DC power supply. For example, if power is supplied to the wireless communication device 10 from a household outlet, the power supply determination unit 42 determines that the power supply supplying power to the wireless communication device 10 is an AC power supply. For example, if power is supplied to the wireless communication device 10 from an internally mounted battery, the power supply determination unit 42 determines that the power supply supplying power to the wireless communication device 10 is a DC power supply.

[0043] The reception control unit 44 sets reception conditions, which are setting conditions when receiving radio waves, for the reception unit 20. For example, if the power source determination unit 42 determines that the power source supplying power to the wireless communication device 10 is an AC power source, the reception control unit 44 sets normal reception conditions for the reception unit 20. For example, if the power source determination unit 42 determines that the power source supplying power to the wireless communication device 10 is a DC power source, the reception control unit 44 switches the conditions set for the reception unit 20 from the normal reception conditions to other reception conditions if at least one of the remaining battery charge of the DC power source and the reception time information and reception information acquired by the acquisition unit 40 meets a predetermined condition.

[0044] For example, when the power source supplying power to the wireless communication device 10 is a DC power source and the received information includes emergency information, the reception control unit 44 switches the reception conditions set in the receiving unit 20 to emergency reception conditions. For example, when the power source supplying power to the wireless communication device 10 is a DC power source, the received information includes emergency information, and the location of the wireless communication device 10 is included in an area covered by the emergency information, the reception control unit 44 switches the conditions set in the receiving unit 20 to emergency reception conditions.

[0045] The reception control unit 44 may switch the reception conditions set in the reception unit 20, for example, based on the reception time information acquired by the acquisition unit 40. In this case, the reception control unit 44 switches the reception conditions set in the reception unit 20 to reception conditions associated with the time period corresponding to the reception time information, for example, based on the reception table TB8 (see FIG. 9) stored in the storage unit 28. For example, if the reception time indicated by the reception time information is 9:00, the reception control unit 44 switches the reception conditions set in the reception unit 20 to periodic reception conditions.

[0046] The output control unit 46 controls the output unit 26 to output audio. For example, the output control unit 46 decodes the audio signal acquired by the acquisition unit 40 and causes the output unit 26 to output audio.

[0047] For example, when the receiving unit 20 receives an emergency broadcast, the output control unit 46 causes the output unit 26 to output an emergency sound at a high volume. For example, when the receiving unit 20 receives an emergency broadcast, the output control unit 46 causes the LED to emit light in a predetermined light emission pattern to notify the user that an emergency broadcast has been received. This allows the user to reliably hear the emergency broadcast, which is an important broadcast.

[0048] [Processing of wireless communication devices] (Reception table generation process) The flow of processing for generating a reception table according to the embodiment will be described with reference to Fig. 10. Fig. 10 is a flowchart showing the flow of processing for generating a reception table according to the embodiment.

[0049] The process shown in FIG. 10 is executed when, for example, the wireless communication device 10 is supplied with power from an AC power source such as a household power source.

[0050] The reception control unit 44 determines whether the receiving unit 20 has received a broadcast (step S10). If it is determined that the receiving unit 20 has received a broadcast (step S10; Yes), the process proceeds to step S12. If it is determined that the receiving unit 20 has not received a broadcast (step S10; No), the process proceeds to step S14.

[0051] If the determination in step S10 is Yes, the reception control unit 44 generates reception history information representing the broadcasts received by the receiving unit 20 (step S12). FIG. 11 is a diagram for explaining the reception history information according to the embodiment. The reception control unit 44 generates the reception history information as a reception history table TB9. The reception history table TB9 includes items such as "reception time," "reception ID," "broadcast type," and "radio wave strength."

[0052] "Reception time" indicates the time when the receiving unit 20 received the broadcast. "Reception ID" indicates the sender of the broadcast received by the receiving unit 20. "Broadcast type" indicates the type of broadcast received by the receiving unit 20. "Radio wave strength" indicates the radio wave strength when the receiving unit 20 received the broadcast. One example of the reception history table TB9 indicates that the receiving unit 20 received a "regular broadcast" from "AAAA" at "9:00", and the radio wave strength was "-90 [dBm]". It is preferable that the reception control unit 44 generates the reception history table TB9 for each day of the week, for example.

[0053] Returning to FIG. 10, the reception control unit 44 determines whether a predetermined period of time has elapsed (step S14). The predetermined period of time may be set arbitrarily, such as one week or one month. If it is determined that the predetermined period of time has elapsed (step S14; Yes), the process proceeds to step S16. If it is determined that the predetermined period of time has not elapsed (step S14; No), the process proceeds to step S10.

[0054] If the determination in step S14 is Yes, the reception control unit 44 generates a reception table based on the reception history information (step S16). Specifically, the reception control unit 44 generates a reception table that associates reception times with reception conditions for receiving broadcasts corresponding to those reception times, for example, based on the reception history table TB9 (see FIG. 11). In this way, the reception control unit 44 can generate, for example, the reception table TB8 shown in FIG. 9. For example, if reception history information is generated for each day of the week, the reception control unit 44 generates a reception table for each day of the week. The reception control unit 44 stores the generated reception table in the storage unit 28. Then, the processing of FIG. 10 ends.

[0055] (Update process for reception table and reception condition table) The update process of the reception table and the reception condition table according to the embodiment will be described with reference to Fig. 12. Fig. 12 is a flowchart showing the flow of the update process of the reception table and the reception condition table according to the embodiment.

[0056] The process shown in FIG. 12 is executed, for example, when the wireless communication device 10 stores the reception table and the reception condition table and is supplied with power from an AC power source such as a household power source.

[0057] The reception control unit 44 determines whether or not a reception table and a reception condition table are stored in the storage unit 28 (step S20). If it is determined that a reception table and a reception condition table are stored in the storage unit 28 (step S20; Yes), the process proceeds to step S22. If it is determined that a reception table and a reception condition table are not stored in the storage unit 28 (step S20; No), the process of FIG. 12 ends.

[0058] The processes from step S22 to step S26 are the same as the processes from step S10 to step S14 shown in FIG. 10, respectively, and therefore will not be described here.

[0059] If step S26 returns "Yes," the reception control unit 44 updates the reception table and reception condition table stored in the storage unit 28 based on the reception history information (step S28). Specifically, the reception control unit 44 updates the reception table stored in the storage unit 28 to a reception table that reflects the latest communication conditions based on the reception history information. This allows the reception control unit 44 to set reception conditions for the reception unit 20 that correspond to the latest communication conditions for each time period. This enables the reception unit 20 to properly receive various broadcasts in each time period. The reception control unit 44 updates the RSSI threshold, FSW allowable number of bits, and FSW determination time settings included in the reception table based on the reception history information. For example, if the radio wave strength included in the reception history information indicates a tendency toward low radio wave strength, the reception control unit 44 updates the RSSI value included in the reception table to be lower than the current value. This allows the reception unit 20 to properly receive broadcasts with low radio wave strength under various reception conditions. The processing of FIG. 12 then ends.

[0060] Furthermore, in step S28, the reception control unit 44 may update the reception table and the reception condition table based on location information of the location where the wireless communication device 10 is used. For example, if the reception control unit 44 acquires, via the receiving unit 20, reception history information for the past week in the area that includes the location where the wireless communication device 10 is used, the reception control unit 44 may update the reception table and the reception condition table based on the acquired reception history information. This updates the reception table and the reception condition table to be appropriate for the location where the wireless communication device 10 is used, allowing the receiving unit 20 to properly receive various broadcasts.

[0061] (Reception condition change process) The reception condition change process according to the embodiment will be described with reference to Fig. 13. Fig. 13 is a flowchart showing the flow of the reception condition change process according to the embodiment.

[0062] The power supply determination unit 42 determines whether or not power to the wireless communication device 10 is supplied from a DC power supply (step S40). If it is determined that power is supplied from a DC power supply (step S40; Yes), the process proceeds to step S44. If it is determined that power is not supplied from a DC power supply, that is, that power is supplied from an AC power supply (step S40; No), the process proceeds to step S42.

[0063] If the determination in step S40 is No, the reception control unit 44 sets the normal reception conditions in the reception unit 20 (step S42), and then proceeds to step S52.

[0064] If the determination in step S40 is Yes, the reception control unit 44 determines whether the receiving unit 20 has received emergency information (step S44). If it is determined that the receiving unit 20 has received emergency information (step S44; Yes), the process proceeds to step S46. If it is determined that the receiving unit 20 has not received emergency information (step S44; No), the process proceeds to step S50.

[0065] If the determination in step S44 is Yes, the reception control unit 44 determines whether the location where the wireless communication device 10 is used is in a target area for emergency broadcasts (step S46). Specifically, if the location information indicated by the GNSS signal received by the GNSS receiving unit 22 is included in the target area indicated by the emergency information, the reception control unit 44 determines that the location where the wireless communication device 10 is used is in a target area for emergency broadcasts. If it is determined that the location where the wireless communication device 10 is used is in a target area for emergency broadcasts (step S46; Yes), the process proceeds to step S48. If it is determined that the location where the wireless communication device 10 is used is not in a target area for emergency broadcasts (step S46; No), the process proceeds to step S50.

[0066] If the determination in step S46 is Yes, the reception control unit 44 sets emergency reception conditions in the reception unit 20 (step S48).

[0067] The control unit 30 determines whether or not to end the process (step S52). The control unit 30 determines to end the process when, for example, the power is turned off or power is no longer supplied to the wireless communication device 10. If it is determined to end the process (step S52; Yes), the process of Fig. 13 ends. If it is determined not to end the process (step S52; No), the process returns to step S40, and the control unit 30 repeats the process of Fig. 13.

[0068] As described above, this embodiment sets reception conditions for the wireless communication device based on the power supplied to the wireless communication device, the reception time, and information on whether the information is an emergency information, thereby enabling appropriate reception of various broadcasts according to the reception environment.

[0069] The components of each device shown in the figure are conceptual functional components and do not necessarily have to be physically configured as shown. 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 depending on various loads and usage conditions. This distribution and integration configuration may also be performed dynamically.

[0070] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the contents of these embodiments. Furthermore, 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 combined as appropriate. 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]

[0071] 10. Wireless communication devices 20 Receiving unit 22 GNSS receiver 24 Input section 26 Output section 28 Memory section 30 Control Unit 40 Acquisition Department 42 Power supply determination section 44 Reception control section 46 Output control section

Claims

1. a location information acquisition unit that acquires location information of the communication device; a receiving unit that receives data from another communication device; an acquisition unit that acquires reception information and an audio signal from the data received by the receiving unit and acquires a reception time of the device itself when the data is received; a power supply determination unit that determines whether the power supply supplying power to the communication device is an AC power supply or a DC power supply; a reception control unit that sets reception conditions, which are setting conditions for reception, for the reception unit; a storage unit that stores a first receiving condition, which is the normal receiving condition, and a plurality of other receiving conditions different from the first receiving condition as a receiving condition table; Equipped with the reception control unit, when it is determined that the power source supplying power to the communication device is the DC power source, and at least one of the remaining battery charge of the DC power source, the reception time, and the reception information satisfies a predetermined condition, switches from the first reception condition to a second reception condition corresponding to the predetermined condition among the plurality of other reception conditions; Wireless communication device.

2. the plurality of other reception conditions includes an emergency reception condition, the reception control unit switches the reception conditions to the emergency reception conditions when emergency information is included in the reception information acquired by the acquisition unit and the location information is included in a target area of ​​the emergency information. The wireless communication device according to claim 1 .

3. the storage unit stores, as history information, the reception condition table in which the reception times previously acquired by the acquisition unit are associated with the reception conditions; the reception control unit switches to the reception conditions corresponding to the current time based on the history information recorded in the storage unit when the reception information acquired by the acquisition unit does not include emergency information, or when the reception information acquired by the acquisition unit includes emergency information and the location information is not included in a target area of ​​the emergency information; The wireless communication device according to claim 2 .

4. the reception conditions are an RSSI threshold, which is a threshold level of received radio wave strength, an FSW allowable bit number, which is a determination bit number for determining that frame synchronization data has been received, and an FSW determination time, which is a determination time for determining that frame synchronization data has been received; When switching the reception condition to the emergency reception condition, the reception control unit executes at least one of making the RSSI threshold smaller than that of the first reception condition, making the FSW allowable bit number larger than that of the first reception condition, and making the FSW determination time shorter than that of the first reception condition. The wireless communication device according to claim 2 .

5. acquiring location information of the communication device by a receiving unit; receiving data from another communication device; acquiring reception information and an audio signal from the data received by the receiving unit, and acquiring a reception time of the device itself when the data was received; determining whether the power source supplying power to the communication device is an AC power source or a DC power source; setting reception conditions for the receiving unit; a step of storing a first receiving condition, which is the normal receiving condition, and a plurality of other receiving conditions different from the first receiving condition as a receiving condition table; a step of switching from the first reception condition to a second reception condition corresponding to the predetermined condition among the plurality of other reception conditions when it is determined that the power source supplying power to the communication device is the DC power source and at least one of the remaining battery charge of the DC power source, the reception time, and the reception information satisfies a predetermined condition; A wireless communication method comprising:

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