JP7151345B2 - Wireless communication device, clock and wireless communication program - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wireless communication device, a watch provided with the wireless communication device, and a wireless communication program.

Bluetooth (registered trademark) Low Energy (BLE) is known as one of the low-power communication technologies. In recent years, BLE has been used as a short-range wireless communication device in various electronic devices such as watches. Some wireless communication devices of this type have a function of automatically attempting to reconnect communication when a link loss occurs due to unintentional disconnection of communication between devices due to some failure or the like. It is

JP-A-2004-96453

Generally, in BLE communication, power consumption for "connecting" is greater than power consumption for "connecting". Therefore, if reconnection is performed frequently, there is a risk that the remaining battery level of the wireless communication device will soon run out.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wireless communication device having a highly practical reconnection function, a timepiece equipped with the wireless communication device, and a wireless communication method.

In order to achieve the above object, a wireless communication device according to a first aspect is a wireless communication device that communicates with another wireless communication device, and detects whether or not communication with the other wireless communication device has been disconnected. and, when the communication is disconnected, the reconnection based on the power consumption required until reconnection with the other radio communication device and the power consumption during connection of the communication with the other radio communication device A processing unit is provided for determining a time interval before making a connection.

A clock of a second aspect is a clock that communicates with an external terminal, determines whether or not communication with the external terminal is disconnected, and reconnects with the external terminal when the communication is disconnected. and a processing unit that determines a time interval until the reconnection based on power consumption required until the reconnection and power consumption during connection of the communication with the external terminal.

A wireless communication program according to a third aspect is a wireless communication program in a wireless communication device that communicates with another wireless communication device, the program determining whether or not communication with the other wireless communication device has been disconnected; When the communication is disconnected, the reconnection is performed based on the power consumption required until reconnection with the other wireless communication device and the power consumption during connection of the communication with the other wireless communication device. causing the computer to determine a time interval to .

According to the present invention, it is possible to provide a wireless communication device having a highly practical reconnection function, a clock provided with the wireless communication device, and a wireless communication program.

FIG. 1 is a diagram showing an example configuration of a watch as an example of a wireless communication device according to each embodiment. FIG. 2 is a data flow diagram showing the flow of communication between the watch and the smartphone. FIG. 3 is a flow chart showing main operations of the timepiece in each embodiment. FIG. 4 is a flowchart showing disconnection processing in each embodiment. FIG. 5 is a flowchart showing reconnection interval calculation processing in the first embodiment. FIG. 6 is a flowchart showing reconnection interval calculation processing in the second embodiment. FIG. 7A is a diagram showing a modification in which the advertising signal is divided into multiple times and sent. FIG. 7B is a diagram showing a modification in which the advertising signal is divided into multiple times and sent. FIG. 7C is a diagram showing a modification in which the advertising signal is divided into multiple times and sent.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 is a diagram showing an example configuration of a watch as an example of a wireless communication device according to each embodiment. Clock 100 has CPU 1 , bus 2 , clock circuit 3 , switch 4 , ROM 5 , RAM 6 , antenna 7 , Bluetooth module 8 , UART interface 9 and timer 10 . Here, the watch 100 performs BLE communication with a smartphone (external terminal), which is another wireless communication device, for example. Then, the clock 100 receives an incoming email or the like from the smartphone, and notifies the user of the incoming email by sounding an alarm sound or the like.

CPU 1 is a processing unit that controls the overall operation of timepiece 100 . The CPU 1 performs various controls according to programs stored in the ROM 5, for example. Here, the processing unit that controls the timepiece 100 does not necessarily have to be the CPU. ASIC, FPGA, or the like may be used instead of the CPU. Also, the CPU 1 does not necessarily have to be independent. The CPU 1 may perform the operations described later by a plurality of CPUs.

A bus 2 is connected to the CPU 1, the clock circuit 3, the switch 4, the ROM 5, the RAM 6, the UART interface 9, and the timer 10, and is a transfer path for transferring various data inside the clock 100. FIG.

The clock circuit 3 is a circuit that measures time and presents the measured time so that the user can visually recognize it. The timer circuit 3 measures time using, for example, a crystal oscillator. The clock circuit 3 is not particularly limited as long as it can keep accurate time. Also, the configuration for presenting the time may be an analog system using a long hand and a short hand, or a digital system using a display. The timer circuit 3 may also include a circuit for reproducing an alarm sound or the like.

The switch 4 is various hardware switches for performing various operations of the timepiece 100 . When the switch 4 is operated, a signal corresponding to the operated switch is input to the CPU1. Switch 4 may include buttons, dials, and the like.

The ROM 5 nonvolatilely stores programs necessary for various processes by the CPU 1 . In addition, the ROM 5 nonvolatilely stores various parameters necessary for the operation of the timepiece 100 .

The RAM 6 temporarily stores data and the like processed by the CPU 1 and the like.

The antenna 7 is, for example, a printed antenna, and is used for transmitting and receiving radio waves during wireless communication in the watch 100 . The antenna 7 does not necessarily have to be a printed antenna.

The Bluetooth module 8 performs various processes for BLE communication. For example, the Bluetooth module 8 performs processing such as modulation or demodulation of signals during BLE communication.

A UART (Universal Asynchronous Receiver Transmitter) interface 9 is an interface for communication between the Bluetooth module 8 and, for example, the CPU 1 in the watch 100 . The interface does not necessarily have to be a UART interface.

The timer 10 is a timer for counting various timings during BLE communication.

FIG. 2 is a data flow diagram showing the flow of communication between the watch 100 and the smartphone. First, the watch 100 performs advertising. In advertising, watch 100 broadcasts advertising signal ADV_IND at predetermined advertising intervals. After the advertising signal is transmitted for a predetermined advertising period, the watch 100 waits for advertising until the next advertising period arrives. Such advertising is repeated until a connection request is made from the smartphone. Of course, it may be configured such that the advertising is timed out after a certain number of advertising periods have elapsed.

The smartphone that receives the advertising signal refers to the information contained in the packet of the advertising signal, recognizes the existence of the watch 100, and transmits a connection request CONNECT_REQ to the watch 100 as necessary.

Upon receiving the connection request CONNECT_REQ, the communication state shifts to service discovery. In service discovery, the watch 100 and the smartphone transmit and receive necessary data LL_DATA at predetermined connection intervals.

After completion of service discovery, the smartphone transmits a connection parameter update request LL_CONNECTION_UPDATE_REQ to watch 100 . Upon receiving the connection parameter update request LL_CONNECTION_UPDATE_REQ, the watch 100 returns a response ACK to the smartphone. The state of communication then transitions to connection parameter update. In the connection parameter update, the watch 100 and the smartphone transmit/receive necessary data LL_DATA at predetermined connection intervals. After transmitting and receiving data a predetermined number of times (eg, 6 times), the connection interval is changed. The connection interval is changed, for example, according to the content of communication requested by the application running on the smart phone. A short connection interval is set when an application that requires frequent data transmission/reception is executed. Conversely, when executing an application that does not require frequent data transmission/reception, the connection interval is set long for power saving.

After the connection parameter update is completed, the state of communication shifts to the normal connection state. In the normal connected state, the smart phone requests data LL_DATA required for processing in the application. The watch 100 then returns data LL_DATA in response to the request. Thereafter, basically, data transmission/reception between the watch 100 and the smartphone is repeated at predetermined connection intervals until the smartphone issues a disconnection request.

Here, communication between the watch 100 and the smartphone may be disconnected unintentionally (for example, without user operation) due to radio interference or the like. When such an unintended link loss occurs, the watch 100 automatically performs reconnection processing. The reconnection process is the process from the above-described advertising to connection parameter update. After the reconnection process, the communication state shifts to the connected state.

This embodiment aims to improve the efficiency of reconnection processing by adjusting the time from link loss to reconnection. A specific description will be given below. FIG. 3 is a flow chart showing main operations of the timepiece 100 in each embodiment.

In step S1, the CPU 1 instructs the Bluetooth module 8 to execute advertising. In response to this, the Bluetooth module 8 starts broadcasting the advertising signal.

In step S2, the CPU 1 determines whether or not there is a connection request CONNECT_REQ. If it is determined in step S2 that there is no connection request CONNECT_REQ, the process returns to step S1. In this case, advertising is resumed during the next advertising period. The process may time out after a certain number of advertising periods. If it is determined in step S2 that there is a connection request CONNECT_REQ, the process proceeds to step S3.

At step S3, the CPU 1 instructs the Bluetooth module 8 to transmit and receive data for service discovery. In response to this, the Bluetooth module 8 transmits/receives data LL_DATA for service discovery to/from the device to which the connection request CONNECT_REQ is issued, here the smartphone. After the data transmission/reception is completed, the process proceeds to step S4.

In step S4, the CPU 1 determines whether or not there is a connection parameter update request LL_CONNECTION_UPDATE_REQ. If it is determined in step S4 that there is no connection parameter update request LL_CONNECTION_UPDATE_REQ, the process returns to step S3. In this case, transmission and reception of data for service discovery are continued. If it is determined in step S4 that there is a connection parameter update request LL_CONNECTION_UPDATE_REQ, the process proceeds to step S5.

At step S5, the CPU 1 instructs the Bluetooth module 8 to transmit and receive data for changing the connection interval. In response to this, the Bluetooth module 8 transmits/receives data LL_DATA for changing the connection interval to/from the smartphone. After the transmission/reception of data for a predetermined number of times is completed, the process proceeds to step S6.

In step S6, the CPU 1 instructs the Bluetooth module 8 to transmit data according to the request from the smart phone. In response to this, the Bluetooth module 8 transmits data LL_DATA to and from the smart phone. Although not shown in FIG. 3, when a communication disconnection request is received from the smartphone in step S6, the CPU 1 instructs the Bluetooth module 8 to disconnect communication.

At step S7, the CPU 1 determines whether or not a link loss has occurred. For example, if there is no data request from the smartphone during the connection interval, it is determined that a link loss has occurred. In addition, it may be determined whether or not a link loss has occurred based on the intensity of radio waves or the like. When it is determined in step S7 that link loss has not occurred, the process returns to step S6. In this case, data transmission/reception continues. When it is determined in step S7 that link loss has occurred, the process proceeds to step S8.

In step S8, the CPU 1 executes disconnection processing. Details of the disconnection process will be described later. When reconnection is performed as a result of the disconnection process, the process returns to step S3.

The disconnection process will be described below. FIG. 4 is a flowchart showing disconnection processing in each embodiment.

In step S11, the CPU 1 performs reconnection interval calculation processing. The reconnection interval calculation process is a process of calculating a reconnection interval, which is the interval until advertising for reconnection is executed. Details of the reconnection interval calculation processing will be described later. Here, the explanation is continued on the assumption that the reconnection interval is calculated.

At step S12, the CPU 1 causes the timer 10 to start counting. At step S13, the CPU 1 determines whether the count of the timer 10 has exceeded the reconnection interval. When it is determined in step S13 that the count of timer 10 has not exceeded the reconnection interval, CPU 1 waits for processing. That is, in the present embodiment, reconnection processing is not performed until the reconnection interval elapses. When it is determined in step S13 that the count of timer 10 has exceeded the reconnection interval, the process proceeds to step S14.

In step S14, the CPU 1 instructs the Bluetooth module 8 to execute advertising. In response to this, the Bluetooth module 8 starts broadcasting the advertising signal.

In step S15, the CPU 1 determines whether or not there is a connection request CONNECT_REQ. If it is determined in step S15 that there is no connection request CONNECT_REQ, the process proceeds to step S16. If it is determined in step S15 that there is a connection request CONNECT_REQ, the process of FIG. 4 ends. In this case, the process returns to step S3 in FIG. 3, as described above.

In step S16, the CPU 1 determines whether or not the advertising has ended, that is, whether or not the advertising period has elapsed. If it is determined in step S16 that advertising should be terminated, the process returns to step S12. In this case, advertising is resumed after the reconnection interval elapses. The process may time out after a certain number of advertising periods. When the CPU 1 determines in step S16 not to end the advertising, the process returns to step S15. In this case, advertising continues.

The reconnection interval calculation process will be described below. FIG. 5 is a flowchart showing reconnection interval calculation processing in the first embodiment.

In step S21, the CPU 1 calculates the reconnection interval T based on (Equation 1) below.
T=I _R /I _N −T _R (Formula 1)
Here, I _R in (Equation 1) is the current required for reconnection (that is, power consumption), I _N is the current per unit time required for communication in the normal connection state, and _TR is reconnection. This is the time it takes to connect. Note that the CPU 1 may obtain the variable values stored in the ROM 5 in this step.

As described above, advertising, service discovery, and connection parameter update are required before the connection between the watch 100 and the smartphone is completed. That is, _IR is the sum of the current required for advertising, the current required for service discovery, and the current required for connection parameter update reconnection. Also, _TR is the sum of the time required for advertising, the time required for service discovery, and the time required for connection parameter update reconnection.

On the other hand, the current required for communication in the normal connected state is represented by a time average value, and differs depending on the application used on the smartphone in the connected state. For example, when executing an application that does not require relatively frequent data transmission/reception, such as receiving an e-mail on a smartphone, the connection interval is set longer, so the current required as a time average value is small. Conversely, when real-time performance is required, the connection interval is set to be short, so the current required as the time average value is large.

For example, the advertising interval is 20 (ms), the advertising period is 30 (s), the current required for advertising is 1400 (μA/s), the time required for service discovery and connection parameter update is 5 (s), service discovery (connection interval 50 (ms)) and the current required for connection parameter update are each 350 (μA/s), the current IR required for _reconnection can be calculated as follows.
Current required for reconnection _IR = advertising current x advertising period + service discovery current + connection parameter update current
≈ 1400 (µA/s) x 30 (s) + 350 (µA/s) x 5 (s)
= 43750 (μA)
Further, when the current during normal connection (in the case of a connection interval of 1 (s)) is assumed to be 20 (μA/s) on average, the reconnection interval T can be calculated as follows.
Reconnection interval T = 43750 (μA)/20 (μA/s) - (30 (s) + 5 (s))
≈2153 (s)
= 35 minutes and 53 seconds In this example, by setting the reconnection interval to 35 minutes and 53 seconds or more, the time average value of the current required for reconnection will be less than the time average value of the current required during the previous connection. become. In other words, when averaged over time, the current required for reconnection can be the same as or less than the current consumed during connection. In this way, low power consumption can be achieved. Note that the method of calculating the reconnection interval is not limited to the method shown here. In other words, the reconnection interval should be determined so that the time average value of power consumption required until reconnection is less than or equal to the time average value of power consumption during communication connection.

As described above, in the first embodiment, the reconnection interval is set according to the current required for communication during normal connection. As a result, the time average value of power consumption during reconnection can be made equal to the time average value of power consumption during normal connection. Therefore, practical reconnection can be performed even with a wireless communication device that operates on a battery with a small capacity, such as a watch.

[Second embodiment]
A second embodiment will be described below. In the second embodiment, a plurality of advertising patterns are selectively used depending on which of power consumption and reconnection time is emphasized. The advertising pattern includes advertising intervals and advertising periods.

The second embodiment will be specifically described below. The following second embodiment differs from the first embodiment only in reconnection interval calculation processing. The configuration of the watch 100 and operations other than the reconnection interval calculation process are the same as those of the first embodiment. Therefore, the description is omitted.

FIG. 6 is a flowchart showing reconnection interval calculation processing in the second embodiment.

In step S<b>31 , the CPU 1 calculates the reconnection interval T<b>1 when the advertising pattern is the advertising pattern 1 according to the above-described (Equation 1). Advertising pattern 1 is, for example, a pattern in which the advertising interval is advertising interval 1 (eg, 20 (ms)) and the advertising period is advertising period 1 (eg, 30 (s)). In advertising pattern 1, the current required for advertising is, for example, 1400 (μA/s). The time required for service discovery and connection parameter update, the current required for service discovery and the current required for connection parameter update remain unchanged. On the other hand, the current required for communication in the normal connected state is represented by a time average value, and differs depending on the application used on the smartphone in the connected state. Assuming that the average current at the time of normal connection is 20 (μA/s) as described above with a connection interval of 1 (s), the reconnection interval T1 is 35 minutes and 53 seconds.

In step S32, the CPU 1 determines whether or not the reconnection interval T1 calculated in step S31 exceeds a predetermined time (for example, 30 minutes). When it is determined in step S32 that the reconnection interval T1 has not exceeded the predetermined time, the process proceeds to step S33. When it is determined in step S32 that the reconnection interval T1 has exceeded the predetermined time, the process proceeds to step S34.

In step S<b>33 , the CPU 1 adopts the advertising pattern 1 . That is, the CPU 1 sets the advertising interval to advertising interval 1 and sets the advertising period to advertising period 1 . After that, the process of FIG. 6 ends. Advertising is performed with the advertising pattern 1 at the time of reconnection.

In step S34, the CPU 1 calculates the reconnection interval T2 when the advertising pattern is the advertising pattern 2 according to the above-described (formula 1). After that, the process moves to step S35. Advertising pattern 2 is, for example, a pattern in which the advertising interval is advertising interval 2 (eg, 100 (ms)) and the advertising period is advertising period 2 (eg, 60 (s)). In advertising pattern 2, the current required for advertising is, for example, 280 (μA/s). In other words, the advertising pattern 2 is a pattern that tends to take a long time to establish a connection, but consumes less power. The time required for service discovery and connection parameter update, the current required for service discovery and the current required for connection parameter update do not change, so the average current during normal connection (for a connection interval of 1 (s)) is 20 (μA/s) Then, the reconnection interval T2 is calculated as follows.
Current required for reconnection _IR = advertising current x advertising period + connection current + service discovery current + connection parameter update current
≈280(μA/s)×60(s)+350(μA/s)×5(s)
= 18550 (μA)
Reconnection interval T = 18550 (μA)/20 (μA/s) - (60 (s) + 5 (s))
≈863 (s)
= 14 minutes 23 seconds In step S35, the CPU 1 adopts the advertising pattern 2 . That is, the CPU 1 sets the advertising interval to the advertising interval 2 and sets the advertising period to the advertising period 2 . After that, the process of FIG. 6 ends. Advertising is performed with the advertising pattern 1 at the time of reconnection.

As described above, in the second embodiment, an advertising pattern that tends to take a short time to establish a connection but consumes a large amount of power, and an advertising pattern that tends to take a long time to establish a connection but consumes a small amount of power. , it is possible to perform reconnection processing with emphasis on either power consumption or reconnection time. Therefore, a more practical reconnection can be performed compared to the first embodiment.

[Modification 1]
Modifications of the first and second embodiments will be described below. In each of the above-described embodiments, as shown in FIG. 7A, it is assumed that one advertising signal is transmitted during one advertising. On the other hand, as shown in FIG. 7B, one advertising may be divided into two or more times and two or more advertising signals may be transmitted. Also, when two or more advertising signals are transmitted in one advertising, the transmission intervals of the respective advertising signals may be different, as shown in FIG. 7C.

[Modification 2]
In each of the above-described embodiments, the reconnection interval calculation process is performed in the disconnection process when link loss occurs. On the other hand, the reconnection interval calculation process may be performed at any timing, such as after the connection parameter is updated or during normal connection, when the connection interval during normal connection can be known and the current consumption during normal connection can be obtained.

[Modification 3]
In each of the embodiments described above, the reconnection interval calculation process is performed in the clock 100 . On the other hand, the calculation processing of the reconnection interval may be performed in the smart phone. In the case of a smartphone, the connection interval for normal connection can be determined from the content of the application used by itself, so calculation of the reconnection interval is easy.

[Modification 4]
In the second embodiment described above, there are two advertising patterns, advertising pattern 1 and advertising pattern 2 . There may be three or more advertising patterns. Further, in the above-described second embodiment, when the reconnection interval calculated for advertising pattern 1 exceeds a predetermined time, advertising pattern 2 is automatically adopted. The reconnection interval calculated for each advertising pattern may be compared with a predetermined time. Also, there may be two or more predetermined times to be compared with the reconnection interval. Furthermore, this predetermined time may be set according to the content of the application being executed on the smartphone during normal connection.

[Modification 5]
In the second embodiment described above, the advertising pattern is assumed to include the advertising interval and the advertising period. If the Bluetooth module 8 is configured to change the transmission power of the advertising signal, the advertising pattern may further include the transmission power of the advertising signal. In this case, the transmission power of the first advertising pattern is higher than the power consumption of the second advertising pattern. Also, the transmission power of the advertising signal may be included instead of the advertising interval and the advertising period. Furthermore, the advertising pattern may include the configuration of the advertising signal shown in Modification 1.

[Other Modifications]
In each of the embodiments described above, a watch is exemplified as an example of the wireless communication device, and a smart phone is exemplified as an example of the external terminal. The technology described in each of the above-described embodiments can be applied to various wireless communication devices and external terminals that perform wireless communication other than watches and smartphones. Further, in each of the above-described embodiments, BLE communication is exemplified as communication performed between wireless communication devices. Communication performed between wireless communication devices is not limited to BLE communication.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications and applications are of course possible within the scope of the present invention. Further, each process according to the above-described embodiment can also be stored as a program that can be executed by the CPU 1, which is a computer. In addition, it can be distributed by being stored in a storage medium of an external storage device such as a magnetic disk, an optical disk, or a semiconductor memory. Then, the CPU 1 reads the program stored in the storage medium of the external storage device, and the operation is controlled by the read program, thereby executing the above-described processing.

The present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the scope of the present invention at the implementation stage. Further, each embodiment may be implemented in combination as appropriate, in which case the combined effect can be obtained. Furthermore, various inventions are included in the above embodiments, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiments, if the problem can be solved and effects can be obtained, the configuration with the constituent elements deleted can be extracted as an invention.

The invention described in the original claims of the present application is appended below.
[1] A wireless communication device that communicates with another wireless communication device,
Determining whether communication with the other wireless communication device has been disconnected,
When the communication is disconnected, the reconnection is performed based on the power consumption required until reconnection with the other wireless communication device and the power consumption during connection of the communication with the other wireless communication device. determine the time interval to
A wireless communication device comprising a processing unit.
[2] The wireless communication device according to [1], wherein the processing unit determines whether communication with the other wireless communication device has been disconnected without user's operation.
[3] In the processing unit, the time average value of power consumption required until the reconnection with the other wireless communication device is equal to or less than the time average value of power consumption during connection of the communication with the other wireless communication device. The wireless communication device according to [1] or [2], which determines the time interval until the reconnection so that:
[4] The reconnection includes a first pattern that emphasizes the time required to establish reconnection and a second pattern that emphasizes power consumption,
The processing unit performs the reconnection based on the second pattern when a first time interval until the reconnection determined based on the first pattern exceeds a predetermined time. The wireless communication device according to any one of claims [1] to [3].
[5] The reconnection is performed by transmitting an advertising signal to the wireless communication device,
The wireless communication device according to [4], wherein the transmission interval and transmission period of the advertising signal in the first pattern are shorter than the transmission interval and transmission period of the advertising signal in the second pattern.
[6] The reconnection is performed by transmitting an advertising signal to the wireless communication device,
The wireless communication device according to [4] or [5], wherein transmission power of the advertising signal in the first pattern is higher than transmission power of the advertising signal in the second pattern.
[7] The processing unit determines power consumption during connection of the communication with the other wireless communication device according to an interval of transmission and reception of data during connection of the communication with the other wireless communication device [ 1] to [6], the wireless communication device.
[8] A watch that communicates with an external terminal,
Determining whether communication with the external terminal has been disconnected,
Determining a time interval until reconnection based on power consumption required until reconnection with the external terminal and power consumption during connection of the communication with the external terminal when the communication is disconnected do,
A watch with a processing unit.
[9] A wireless communication program in a wireless communication device that communicates with another wireless communication device,
Determining whether communication with the other wireless communication device has been disconnected;
When the communication is disconnected, the reconnection is performed based on the power consumption required until reconnection with the other wireless communication device and the power consumption during connection of the communication with the other wireless communication device. determining a time interval to
A wireless communication program that causes a computer to run

1 CPU, 2 bus, 3 timer circuit, 4 switch, 5 ROM, 6 RAM, 7 antenna, 8 Bluetooth module, 9 UART interface, 10 timer, 100 clock.

Claims (9)

A wireless communication device that communicates with another wireless communication device,
Determining whether communication with the other wireless communication device has been disconnected,
When the communication is disconnected, the reconnection is performed based on the power consumption required until reconnection with the other wireless communication device and the power consumption during connection of the communication with the other wireless communication device. determine the time interval to
A wireless communication device comprising a processing unit. The wireless communication device according to claim 1, wherein the processing unit determines whether communication with the other wireless communication device has been disconnected without user's operation. The processing unit is configured such that a time average value of power consumption required until the reconnection with the other wireless communication device is equal to or less than a time average value of power consumption during connection of the communication with the other wireless communication device. 3. The wireless communication device according to claim 1, wherein the time interval until said reconnection is determined. The reconnection includes a first pattern that emphasizes the time required to establish reconnection and a second pattern that emphasizes power consumption,
The processing unit performs the reconnection based on the second pattern when a first time interval until the reconnection determined based on the first pattern exceeds a predetermined time. The wireless communication device according to any one of claims 1 to 3. The reconnection is performed by transmitting an advertising signal to the wireless communication device,
The radio communication apparatus according to claim 4, wherein the transmission interval and transmission period of the advertising signal in the first pattern are shorter than the transmission interval and transmission period of the advertising signal in the second pattern. The reconnection is performed by transmitting an advertising signal to the wireless communication device,
The radio communication apparatus according to claim 4 or 5, wherein transmission power of the advertising signal in the first pattern is higher than transmission power of the advertising signal in the second pattern. 1 to 8, wherein the processing unit determines power consumption during connection of the communication with the other wireless communication device according to an interval of transmission and reception of data during connection of the communication with the other wireless communication device. 7. The radio communication device according to any one of 6. A clock that communicates with an external terminal,
Determining whether communication with the external terminal has been disconnected,
Determining a time interval until reconnection based on power consumption required until reconnection with the external terminal and power consumption during connection of the communication with the external terminal when the communication is disconnected do,
A watch with a processing unit. A wireless communication program in a wireless communication device that communicates with another wireless communication device,
Determining whether communication with the other wireless communication device has been disconnected;
When the communication is disconnected, the reconnection is performed based on the power consumption required until reconnection with the other wireless communication device and the power consumption during connection of the communication with the other wireless communication device. determining a time interval to
A wireless communication program that causes a computer to run

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