JP2014165885A - Radio communication apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication apparatus that performs switching according to a measurement of at least one of power consumption, communication quality and communication speed, and is capable of suppressing generation of frequent switching.SOLUTION: A radio communication apparatus (10) comprises: an evaluation section (6) that continues comparison between a measurement and a threshold value and calculates an evaluation value from an evaluation result obtained through the continuation; and a control section (3) that switches a communication system of communication means or a communication partner of communication means according to an evaluation value calculated by the evaluation section (6).

Description

  The present invention relates to a wireless communication apparatus.

  In Patent Document 1, in a mobile communication terminal, when an occurrence of an event such as activation of an application program is detected, switching determination between a plurality of communication means included in the mobile communication terminal is performed. Detecting and comparing quality or communication speed is described.

JP 2009-49875 A (published March 5, 2009)

  However, power consumption, communication quality, and communication speed in a wireless communication device frequently change due to fading caused by movement of the wireless communication device. Therefore, as in the prior art, in a wireless communication device that simply detects and compares power consumption etc., and performs switching processing such as switching between communication means according to the result, when power consumption etc. changes finely In addition, there is a possibility of frequent switching processing. In that case, there is a problem that processing accompanying the switching processing (processing for establishing a connection, etc.) frequently occurs, resulting in an increase in power consumption.

  The present invention has been made in view of the above problems, and suppresses frequent switching processing in a wireless communication apparatus that performs switching processing according to at least one measured value of power consumption, communication quality, and communication speed. The main purpose.

  In order to solve the above problem, a wireless communication device according to one aspect of the present invention is selected from the group consisting of a communication unit that performs wireless communication and power consumption, communication quality, and communication speed of the communication unit. Continue to compare the measurement value acquired by the measurement means with a predetermined threshold within a range that does not exceed the predetermined measurement period from the measurement means that acquires the above measurement values and arbitrarily set timing. And calculating means for calculating the evaluation value from the comparison result obtained continuously, and switching means for switching the communication method or the communication partner of the communication means according to the evaluation value calculated by the calculating means. It is characterized by that.

  According to one aspect of the present invention, the measurement value and the threshold value are continuously compared, and the switching process is performed based on the comparison result obtained continuously. Therefore, the switching process is performed when the measurement value changes finely. Frequent occurrence can be suppressed.

It is a functional block diagram which shows schematic structure of the radio | wireless communication apparatus which concerns on one Embodiment of this invention. It is a flowchart explaining the flow of the event determination process and switching process in one Embodiment of this invention. It is a figure for demonstrating the event determination process in one Embodiment of this invention. It is a figure for demonstrating the event determination process in one Embodiment of this invention. It is a figure for demonstrating the event determination process in one Embodiment of this invention. It is a figure for demonstrating the event determination process in one Embodiment of this invention. It is a figure for demonstrating the difference between the total value of an excess amount, and an integral value. It is a figure for demonstrating the event determination process in one Embodiment of this invention. It is a figure for demonstrating the event determination process in one Embodiment of this invention.

Embodiment 1
One embodiment (Embodiment 1) of the present invention will be described as follows. FIG. 1 is a functional block diagram illustrating a schematic configuration of a wireless communication device 10 according to the first embodiment.

  As shown in FIG. 1, a wireless communication device 10 includes a communication unit A (communication unit) 1, a communication unit B (communication unit) 2, a control unit (switching unit) 3, an event measurement unit (measurement unit) 4, a threshold determination. A unit (calculation unit) 5 and an evaluation unit (calculation unit) 6 are provided.

  Each of the communication unit A1 and the communication unit B2 includes a wireless circuit unit, a power amplifier, an antenna, and the like as appropriate, and performs wireless communication using different communication methods. As a communication method, a known wireless method may be used, but is not limited thereto. For example, GSM (registered trademark) (Global System for Mobile Communications), UMTS (Universal Mobile Telecommunications System), LTE (Long Term Evolution), Examples include WiMAX, WiFi (Wireless Fidelity), HSPA (High Speed Packet Access), WCDMA (Wideband Code Division Multiple Access), PCS (Personal Communications Service), and the like. The communication partners of the communication unit A1 and the communication unit B2 are external devices (for example, a base station, an access point, etc.) that can communicate with each other with a corresponding communication method. Or an original communication system may be sufficient.

  The event measurement unit 4 acquires at least one measurement value selected from the group consisting of power consumption, communication quality, and communication speed in the communication unit A1 and the communication unit B2.

  For example, the event measurement unit 4 includes a power consumption detection circuit (not shown) as long as it can acquire power consumption in the communication unit A1 and the communication unit B2. Moreover, the method of utilizing the output of the power consumption detection circuit which communication part A1 and communication part B2 have may be used. The event measuring unit 4 may measure the power consumption of only some members (for example, transmission power amplifiers) included in the communication unit A1 and the communication unit B2, for example.

  Moreover, the event measurement part 4 may acquire communication quality in communication part A1 and communication part B2. As indicators of communication quality, RSSI (Received Signal Strength Identifier), transmission / reception error rate, QoS (Quality of Service) level, delay, jitter, packet loss, and the like can be used as appropriate. Or the method of utilizing the output of the communication quality detection circuit which communication part A1 and communication part B2 have may be used.

  Moreover, the event measurement part 4 may acquire the communication speed in communication part A1 and communication part B2. Or the method of utilizing the output of the communication speed detection circuit which communication part A1 or communication part B2 has may be used.

  Moreover, the event measurement part 4 may acquire the sum which weighted several values among the power consumption in the communication part A1 and the communication part B2, communication quality, and communication speed as a measured value.

  The threshold determination unit 5 compares the measurement value acquired by the event measurement unit 4 with a preset threshold value, and notifies the control unit 3 of the result of interruption.

  The evaluation unit 6 calculates an evaluation value from the comparison result of the threshold value determination unit 5. In the present embodiment, as the evaluation value, the total time during which the measured value of the event measuring unit 4 has exceeded a preset threshold is used. In the present specification, the expression “measured value exceeds a threshold” means that the measured value exceeds a predetermined threshold and is in a bad state (a state to be switched). If the measured value is power consumption, it means that the measured value is above the threshold value. If the measured value is communication quality or communication speed, it means that the measured value is below the threshold value. .

  In the control unit 3, the event measurement unit 4 continuously performs the above measurement within a range not exceeding a predetermined measurement period from an arbitrarily set timing, and the threshold determination unit 5 continuously performs the above comparison. The evaluation unit 6 switches the communication unit to be used between the communication unit A1 and the communication unit B2 according to the evaluation value calculated from the comparison result of the threshold value determination unit 5 (that is, the communication method) To switch). In addition, the control part 3 may switch on / off of each part as needed.

  Hereinafter, an example of the event determination process (evaluation process) and the switching process (switching process) in the present embodiment will be described. FIG. 2 is a flowchart for explaining the flow of these processes. The event determination process is a process for determining whether or not events such as power consumption, communication quality, and communication speed are stably changed, and corresponds to steps S1 to S6 in the flowchart shown in FIG. Further, the switching process is a process of switching the communication method, and corresponds to steps S7 to S8 in the flowchart shown in FIG.

  The event determination process starts at a timing arbitrarily set by the control unit 3. The start timing is not particularly limited. For example, it may be executed periodically, and when the power consumption of the communication system in use increases beyond a threshold, the signal strength or communication speed of the communication system in use is increased. Detects other communication systems with strong signal strength exceeding the criterion value when the number of retransmissions of the packet exceeds the criterion value, when the number of retransmissions of the packet exceeds the criterion value, or when the reception sensitivity decreases beyond the criterion value Then, it may be started when the switching determination function is enabled by the user's operation during communication.

  In step S1, the control unit 3 performs a start process. Specifically, the control unit 3 causes the event measurement unit 4 to start acquiring measurement values, and causes the threshold value determination unit 5 to start comparing the measurement values acquired by the event measurement unit 4 with a preset threshold value. Let Further, the control unit 3 initializes the evaluation value in the evaluation unit 6. That is, the evaluation unit 6 stores a value ΣTt indicating the total time during which the measured value has exceeded the threshold value, and sets this ΣTt to 0.

  In step S2, the event measurement unit 4 acquires a measurement value (measurement process). The event measurement unit 4 may always acquire measurement values, but it is preferable to periodically sample and measure the measurement values. Thereby, the power consumption in the event measurement part 4 can be suppressed.

  In step S3, the threshold determination unit 5 compares the measurement value acquired by the event measurement unit 4 with a preset threshold value (comparison process). Then, the threshold determination unit 5 determines whether or not the measured value exceeds the threshold (if the measured value is power consumption, whether or not the power consumption exceeds the threshold, whether the measured value is communication quality or communication speed). In some cases, the controller 3 is notified of whether the communication quality or the communication speed is below a threshold value).

  In step S4, the evaluation unit 6 calculates an evaluation value from the comparison result of the threshold value determination unit 5 (calculation step). That is, the evaluation unit 6 performs time measurement while the comparison result of the threshold determination unit 5 indicates that the measured value exceeds the threshold, and adds the measured time Tt to ΣTt.

  In step S5, the control unit 3 determines whether or not the evaluation value ΣTt calculated by the evaluation unit 6 exceeds a preset designated time Ts (determination step). Is determined to be stable, the process proceeds to step S7 to perform a switching process. The specified time Ts is not limited to this, but can be, for example, about 70% of the measurement period Ta.

  In step S6, the control unit 3 determines whether the time elapsed since the start of the event determination process is within a preset measurement period Ta, and if it is within the measurement time Ta, Returning to S2, if the measurement time Ta is exceeded, it is determined that a stable event change has not been detected during the measurement period, and the process is terminated without performing the switching process.

  In step S7, the control part 3 performs the event determination process similar to step S1-S6 using communication parts other than the communication part in use. If a communication unit other than the communication unit in use is not activated, the event determination process using the communication unit is executed after the communication unit is activated.

  In step S8, the control unit 3 compares the evaluation values calculated using the communication units in steps S1 to S7, and switches the communication unit to be used to the communication unit having the most favorable evaluation value (switching). Process). In other words, the communication method of the wireless communication device 10 is switched to the communication method with the most favorable evaluation value.

(Effect of this embodiment)
FIG. 3 is a diagram for explaining an event determination process in the present embodiment. As shown in FIG. 3 (a), when the measurement value fluctuates finely during the measurement period, it exceeds the threshold value at a1, but returns at b1, and again exceeds the threshold value at a2, but returns again at b2, and again at a3. The threshold is exceeded, but is back again at b3.

  In the configuration in which the switching process is performed based on the comparison between the measured value and the threshold value only once, the switching process occurs in a1, b1, a2, b2, a3, and b3 as shown in FIG. As a result, an increase in power consumption associated with the switching process occurs.

  On the other hand, in the present embodiment, the comparison between the measurement value and the threshold value is continuously performed, and the switching process is performed based on the comparison result obtained continuously. Therefore, the switching process is frequently performed when the measurement value changes finely. Generation | occurrence | production can be suppressed. Thereby, an increase in power consumption due to frequent switching processing can be suppressed.

  Specifically, in step S4, the evaluation unit 6 measures the time (a1 to b1, a2 to b2, a3 to b3) while the measurement value exceeds the threshold value, and the measurement value exceeds the threshold value. The total time (ΣTt = Tt1 + Tt2 + Tt3 = b1−a1 + b2−a2 + b3−a3) is calculated as an evaluation value, and the switching process is not performed unless the evaluation value exceeds the specified time Ts. ), It is possible to prevent the switching process from being performed when the change in the event (measured value) is unstable.

  Here, the total time for which the measured value exceeds the threshold value is low when the measured value is finely changed in the vicinity of the threshold value as shown in FIG. 3A, so that the measured value is finely changed in the vicinity of the threshold value. In such an unstable state, it is possible to suitably suppress the occurrence of the switching process.

  Then, as shown in FIG. 3B, when the measurement value stably changes during the measurement period, the total time during which the measurement value exceeds the threshold quickly exceeds the specified time Ts. The switching process can be performed smoothly.

  For example, as shown in FIG. 3C, when the state where the measured value greatly exceeds the threshold value continues, the switching process can be performed promptly. On the other hand, when the measured value fluctuates in the vicinity of the threshold as shown in FIG. 3D, or when it takes time until the measured value exceeds the threshold as shown in FIG. The switching process can be performed after the measured value sufficiently exceeds the threshold value.

  As described above, by appropriately setting the designated time Ts, it is possible to appropriately set a criterion for determining whether or not the change in the event (measured value) is stable, and the switching process for the change in the event Can be executed stably. As a result, troubles such as unintentional cutting and malfunction can be prevented.

  In the present embodiment, the switching process is not performed unless a stable event (measured value) change is detected in the communication unit in use. As a result, the communication method being used can be preferentially used continuously.

[Embodiment 2]
Another embodiment (Embodiment 2) of the present invention will be described as follows. For convenience of explanation, members having the same functions as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, as the evaluation value, the total ratio ΣTt / Ta of the time with respect to the measurement period Ta is used instead of the total time in which the measurement value exceeds the threshold value in the first embodiment. For example, in step S4, the evaluation unit 6 calculates the evaluation value ΣTt / Ta by calculating ΣTt and then dividing by Ta. In step S5, the control unit 3 determines whether or not the evaluation value ΣTt / Ta calculated by the evaluation unit 6 exceeds a preset designated ratio Rs. Is determined to be stable, the process proceeds to step S7 to perform a switching process. The designated ratio Rs is not limited to this, but can be set to, for example, about 70%. Even with the above configuration, the same effect as in the first embodiment can be obtained.

[Embodiment 3]
Another embodiment (Embodiment 3) of the present invention will be described as follows. For convenience of explanation, members having the same functions as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, as an evaluation value, an excess amount Po with respect to the threshold value of the measured value is used as shown in FIG. 4 instead of the total time during which the measured value exceeds the threshold value in the first embodiment. That is, the switching process is performed when an excess amount Po equal to or greater than the specified excess amount Ps is observed during the measurement period. For example, in step S4, the evaluation unit 6 subtracts the threshold value from the measurement value when the measurement value is power consumption, and subtracts the measurement value from the threshold value when the measurement value is communication quality or communication speed. As a result, the excess amount Po is calculated. In step S5, the control unit 3 determines whether or not the excess amount Po calculated by the evaluation unit 6 exceeds a preset designated excess amount Ps. It is determined that the operation has been stabilized, and the process proceeds to step S7 to perform a switching process.

  According to the above configuration, when a large excess amount occurs early or early in the measurement period, that is, when the change of the event (measurement value) is abrupt, the switching process can be performed with a quick response without a large delay, and reception is possible. Problems such as a decrease in sensitivity and communication rate can be prevented.

  In the present embodiment, when the measured value greatly exceeds the threshold value in the event determination process, that is, when the excess amount Po becomes a large value, the specified excess amount Ps is increased in the event determination process after the next time. Thus, it is possible to reduce the switching frequency and suppress power consumption. That is, as shown in FIG. 3B, depending on the communication state, a state in which the measured value greatly exceeds the threshold value may continue. In such a case, if switching is simply performed when the threshold value is exceeded, switching processing frequently occurs and power consumption may increase. However, in this embodiment, as described above, the measured value increases the threshold value. When the excess state continues, it is possible to prevent frequent switching processing by increasing the designated excess amount Ps.

[Embodiment 4]
The following will describe another embodiment (Embodiment 4) of the present invention. For convenience of explanation, members having the same functions as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, the total amount ΣPo of the excess amount is used as the evaluation value, as shown in FIG. 5, instead of the excess amount with respect to the threshold value of the measurement value in the third embodiment. For example, in step S1, the evaluation unit 6 initializes ΣPo, and in step S4, the evaluation unit 6 calculates the excess amount Po as in the third embodiment, and adds it to the total ΣPo of the excess amount. In step S5, the control unit 3 determines whether or not the total excess amount ΣPo calculated by the evaluation unit 6 exceeds a preset designated excess amount total value Ps. The event change is determined to be stable, and the process proceeds to step S7 to perform a switching process.

  Here, since the total amount ΣPo of the excess amount is low when the measurement value is finely changed near the threshold, the switching process occurs in an unstable state where the measurement value is finely changed near the threshold. It can suppress suitably. In addition, when the change of the event (measured value) is abrupt, a large excess amount occurs early in the measurement period, and the total excess amount becomes large, the switching process can be performed with a quick response and no large delay. As described above, by appropriately setting the designated excess amount total value Ts, it is possible to appropriately set the determination criterion as to whether or not the change in the event (measured value) is stable, and the communication status Stability and sensitivity can be controlled accordingly.

[Embodiment 5]
Another embodiment (Embodiment 5) of the present invention will be described as follows. For convenience of explanation, members having the same functions as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, as an evaluation value, instead of the total excess amount with respect to the measurement value threshold in the fourth embodiment, as shown in FIG. 6, the integral value ΣPo of the excess amount with respect to the measurement value threshold (in FIG. Area). The integral value of the excess amount can be calculated using, for example, a trapezoid formula, a Simpson formula, or the like. Thus, by using the integral value of the excess amount instead of the total value of the excess amount, the calculation error can be reduced as compared with the fourth embodiment, and the accuracy of the acquired data can be further improved. That is, the total value of the excess amount is equivalent to the total area S of the rectangles shown in FIG. 7A (S = Σy, where unit time Δt = 1). The integral value of the calculated excess amount is the sum of the trapezoidal areas shown in FIG. 7B (S = (y1 + y2) / 2 + (y2 + y3) / 2 + (y3 + y4) / 2 + (y4 + y5) / 2, but unit time Δt = 1), and a more accurate value can be calculated.

[Embodiment 6]
Another embodiment (Sixth Embodiment) of the present invention will be described as follows. For convenience of explanation, members having the same functions as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In this embodiment, as shown in FIG. 8, in addition to the total time ΣTt1 of the measurement value exceeding the threshold in Embodiment 1, the total time ΣTt2 of the measurement value not exceeding the threshold is used as the evaluation value. Use. For example, in step S1, the evaluation unit 6 initializes ΣTt1 and ΣTt2, and in step S4, the evaluation unit 6 shows that the comparison result of the threshold value determination unit 5 indicates that the measured value exceeds the threshold value. The measured time Tt1 is added to ΣTt1, and the measured time Tt2 while adding that the measured value does not exceed the threshold is added to ΣTt2. In step S5, the control unit 3 determines whether or not the evaluation value ΣTt1 calculated by the evaluation unit 6 exceeds ΣTt2, and if so, determines that the event change is stable, and step S7. Switch to and perform the switching process. Even with the above configuration, the same effect as in the first embodiment can be obtained.

[Embodiment 7]
Another embodiment (Embodiment 7) of the present invention will be described as follows. For convenience of explanation, members having the same functions as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, as shown in FIG. 9, as an evaluation value, in addition to the integral value ΣPo1 of the excess amount with respect to the measurement value threshold in Embodiment 5 (area of the hatched portion in the figure), The insufficient amount of integration value ΣPo2 (the area of the shaded portion in the figure) is used. For example, in step S1, the evaluation unit 6 initializes ΣPo1 and ΣPo2, and in step S4, the evaluation unit 6 indicates that the comparison result of the threshold value determination unit 5 indicates that the measured value exceeds the threshold value. Integral value Po1 calculated using the trapezoidal formula or the like from the excess amount is added to ΣPo1, and the integral value Po2 calculated using the trapezoidal formula or the like from the shortage amount indicating that the measured value does not exceed the threshold value Is added to ΣPo2. In step S5, the control unit 3 determines whether or not the evaluation value ΣPo1 calculated by the evaluation unit 6 exceeds ΣPo2, and if so, determines that the event change is stable, and step S7. Switch to and perform the switching process. Even with the above configuration, the same effect as in the fifth embodiment can be obtained.

[Modification]
In Embodiments 1 to 7, the case where there are two communication units has been described. However, the present invention is not limited to this, and there may be three or more communication units. Further, when one communication unit is compatible with a plurality of communication methods, the number of communication units may be one.

  Moreover, although Embodiment 1-7 demonstrated the structure which the control part 3 switches a communication system according to the evaluation value which the evaluation part 6 computed, it is not limited to this, The evaluation part 6 is not limited to this. The configuration may be such that the communication partner is switched according to the calculated evaluation value.

  For example, when the communication unit performs mobile communication (cellular communication), by executing the event determination process described above as a determination process at the time of switching (handover) a base station that is a communication partner of wireless communication, It is possible to suppress the occurrence of unnecessary inter-cell handover at the boundary. In this case as well, there may be one communication unit.

  In the first to seventh embodiments, the control unit 3 calculates an evaluation value other than the communication unit being used in the switching process and compares the evaluation values to perform switching. Without being limited, the control unit 3 may switch the communication method or the communication partner based only on the evaluation value of the communication unit in use.

  In the first to seventh embodiments, the evaluation unit 6 calculates the evaluation value based on the comparison result between the measurement value acquired by the event measurement unit 5 and the threshold value. The evaluation value may be calculated by taking into consideration such factors as return, recovery, application activation and termination, network connection and disconnection, handover, and remaining battery level (voltage) reduction. Moreover, in the said embodiment, you may make it perform the calculation performed when the evaluation part 6 has exceeded the threshold value conversely when the threshold value is not exceeded, and the details of the calculation are changed as appropriate. be able to.

  Moreover, you may use the evaluation part 6 combining the calculation method of the evaluation value in Embodiment 1-7.

[Summary]
A wireless communication device (10) according to an aspect of the present invention is selected from the group consisting of communication means (communication unit A1, communication unit B2) for performing wireless communication and power consumption, communication quality, and communication speed of the communication unit. Measurement means (event measurement unit 4) for acquiring one or more measurement values, and a measurement value acquired by the measurement means within a range not exceeding a predetermined measurement period from an arbitrarily set timing. In accordance with the evaluation value calculated by the calculation means (threshold determination section 5 and evaluation section 6) that continuously performs the comparison with the obtained threshold and calculates the evaluation value from the comparison result obtained continuously. Switching means (control unit 3) for switching the communication method or communication partner of the communication means.

  According to the above configuration, since the comparison between the measurement value and the threshold value is continuously performed, and the switching process is performed based on the comparison result obtained continuously, the switching process is frequently performed when the measurement value changes finely. Generation | occurrence | production can be suppressed.

  In the wireless communication apparatus according to one aspect of the present invention, the calculation unit continuously performs the comparison between the measured value and the threshold value, and the total time when the measured value exceeds the threshold value, or the total The ratio with respect to the measurement period may be calculated as an evaluation value.

  According to said structure, the sum total of the time when a measured value exceeds the threshold value, or the ratio with respect to the measured time is made into an evaluation value. Since such an evaluation value is low when the measurement value is finely changed near the threshold value, it is preferable to suppress occurrence of switching processing in an unstable state where the measurement value is finely changed near the threshold value. can do.

  In the wireless communication apparatus according to one aspect of the present invention, the calculation unit continuously compares the measured value with the threshold value, and calculates an excess amount of the measured value with respect to the threshold value as an evaluation value. May be.

  According to said structure, it is set as the excess amount evaluation value with respect to the threshold value of a measured value observed during the fixed measurement period. As a result, when a large excess occurs early or early in the measurement period, that is, when the event (measurement value) changes suddenly, the switching process can be performed without a large delay with a quick response, and the communication rate is reduced. Can prevent problems.

  In the wireless communication apparatus according to one aspect of the present invention, the calculation unit continues to compare the measured value with the threshold value, and calculates a total of the excess amount of the measured value with respect to the threshold value as an evaluation value. It may be.

  Here, since the total amount ΣPo of the excess amount is low when the measurement value is finely changed near the threshold value, according to the above configuration, in an unstable state where the measurement value is finely changed near the threshold value, It is possible to suitably suppress the occurrence of the switching process. In addition, when the change of the event (measured value) is abrupt, a large excess amount occurs early in the measurement period, and the total excess amount becomes large, the switching process can be performed with a quick response and no large delay.

  In the wireless communication apparatus according to one aspect of the present invention, the calculation unit continuously performs the comparison between the measured value and the threshold value, the time when the measured value exceeds the threshold value, and the measured value is the threshold value. The time when the measured value does not exceed the threshold value is compared with the time when the measured value exceeds the threshold value, which is calculated by the calculating means. Depending on the result, the communication method of the communication means or the communication partner may be switched.

  According to said structure, a switching process is performed according to the comparison result of the time when the measured value exceeds the threshold value, and the time when the measured value does not exceed the threshold value. When the measurement value changes finely near the threshold value, the time during which the measurement value does not exceed the threshold value becomes long.Therefore, switching processing occurs in an unstable state where the measurement value changes finely near the threshold value. It can suppress suitably.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

[Example of software implementation]
Finally, each block of the wireless communication device 10, in particular, the control unit 3, the threshold determination unit 5, and the evaluation unit 6 may be realized in hardware by a logic circuit formed on an integrated circuit (IC chip). Alternatively, it may be realized by software using a CPU (Central Processing Unit).

  In the latter case, the wireless communication device 10 includes a CPU that executes instructions of a program that realizes each function, a ROM (Read Only Memory) that stores the program, a RAM (Random Access Memory) that expands the program, the program, A storage device (recording medium) such as a memory for storing various data is provided. An object of the present invention is a recording medium in which a program code (execution format program, intermediate code program, source program) of a control program of the wireless communication apparatus 10 which is software that realizes the above-described functions is recorded so as to be readable by a computer. This can also be achieved by supplying the wireless communication apparatus 10 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).

  Examples of the recording medium include non-transitory tangible medium, such as magnetic tape and cassette tape, magnetic disk such as floppy (registered trademark) disk / hard disk, and CD-ROM / MO. Discs including optical discs such as / MD / DVD / CD-R, cards such as IC cards (including memory cards) / optical cards, semiconductor memories such as mask ROM / EPROM / EEPROM (registered trademark) / flash ROM Alternatively, logic circuits such as PLD (Programmable Logic Device) and FPGA (Field Programmable Gate Array) can be used.

  The wireless communication device 10 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited as long as it can transmit the program code. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication network, and the like can be used. The transmission medium constituting the communication network may be any medium that can transmit the program code, and is not limited to a specific configuration or type. For example, even with wired lines such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, and ADSL (Asymmetric Digital Subscriber Line) line, infrared rays such as IrDA and remote control, Bluetooth (registered trademark), IEEE 802.11 wireless, HDR ( It can also be used by radio such as High Data Rate (NFC), Near Field Communication (NFC), Digital Living Network Alliance (DLNA), mobile phone network, satellite line, and digital terrestrial network. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  The present invention can be used in the field of manufacturing wireless communication devices.

1 Communication unit A (communication means)
2 Communication part B (communication means)
3 Control unit (switching means)
4 Event measurement unit (measuring means)
5 threshold determination unit (calculation means)
6 Evaluation part (calculation means)
10 Wireless communication device

Claims (5)

A communication means for performing wireless communication;
Measuring means for acquiring one or more measurement values selected from the group consisting of power consumption, communication quality and communication speed of the communication means;
Comparison between the measured value acquired by the measuring means and the predetermined threshold is continuously performed within a range not exceeding the predetermined measurement period from the arbitrarily set timing, and the comparison result obtained continuously. Calculating means for calculating an evaluation value from
A wireless communication apparatus comprising: a switching unit that switches a communication method or a communication partner of the communication unit according to the evaluation value calculated by the calculation unit.   The calculation means continues to compare the measured value with the threshold value, and calculates the total time when the measured value exceeds the threshold value or the ratio of the total to the measurement period as an evaluation value. The wireless communication apparatus according to claim 1.   The wireless communication apparatus according to claim 1, wherein the calculation unit continuously compares the measured value with the threshold value, and calculates an excess amount of the measured value with respect to the threshold value as an evaluation value.   2. The wireless communication according to claim 1, wherein the calculation unit continuously compares the measured value with the threshold value, and calculates a sum of excess amounts of the measured value with respect to the threshold value as an evaluation value. apparatus. The calculation means continuously performs the comparison between the measured value and the threshold value, calculates a time when the measured value exceeds the threshold value, and a time when the measured value does not exceed the threshold value as an evaluation value,
The switching means is a communication method or communication of the communication means according to a result of comparing the time when the measurement value calculated by the calculation means exceeds the threshold value and the time when the measurement value does not exceed the threshold value. The wireless communication apparatus according to claim 1, wherein the other party is switched.

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