Wireless communication device, wireless communication method and program

Abstract

In this wireless communication device, a wireless communication module transmits a wireless signal, and a CPU sets a phase of the wireless signal, a modulation depth, and a transmission power on the basis of a resonant frequency of the wireless communication module, a received signal strength of the wireless communication module, and the temperature inside the wireless communication module.

Description

[Technical field]

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

[0002] In recent years, portable wireless communication devices (hereinafter sometimes referred to as "portable communication devices") that are equipped with wireless communication modules that are configured using contactless IC (Integrated Circuit) chips and the like and that can communicate with a reader / writer in a short distance without contact have become widespread. Examples of contactless communication systems in which communication is performed between a portable communication device and a reader / writer include electronic money systems and ticket gate systems for public transportation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-201751 A [Patent Document 2] JP 2015-142208 A [Patent Document 3] JP 2012-209749 A Summary of the Invention [Problem to be solved by the invention]

[0004] The resonant frequency of a wireless communication module mounted on a mobile communication device varies for each wireless communication module due to variations in the performance of the components that make up the wireless communication module. Also, the optimal phase of a wireless signal transmitted from a mobile communication device to a reader / writer varies depending on the resonant frequency of the wireless communication module. Therefore, if the phase of the wireless signal deviates from the optimal phase due to a change in the resonant frequency, the communication characteristics of the mobile communication device cannot be guaranteed.

[0005] Therefore, the present disclosure proposes a technique capable of ensuring the communication characteristics of a wireless communication device. [Means for solving the problem]

[0006] A wireless communication device according to the present disclosure includes a wireless communication module and a CPU. The wireless communication module transmits a wireless signal. The CPU sets a phase of the wireless signal based on a resonant frequency of the wireless communication module. [Brief description of the drawings]

[0007] [Figure 1] 1 is a diagram illustrating a configuration example of a wireless communication system according to a first embodiment of the present disclosure. [Diagram 2] 1 is a diagram illustrating a configuration example of a mobile communication device according to a first embodiment of the present disclosure. [Diagram 3] FIG. 2 is a diagram illustrating an example of a table according to the first embodiment of the present disclosure. [Figure 4] FIG. 11 is a diagram illustrating an example of a table according to the second embodiment of the present disclosure. [Diagram 5] FIG. 13 is a diagram illustrating an example of a table according to the third embodiment of the present disclosure. [Figure 6] FIG. 13 is a diagram showing an example of a table according to the fourth embodiment of the present disclosure. [Figure 7] FIG. 13 is a diagram showing an example of a table according to the fourth embodiment of the present disclosure. [Figure 8] FIG. 13 is a diagram showing an example of a table according to the fifth embodiment of the present disclosure. [Figure 9] FIG. 23 is a diagram showing an example of a table according to the sixth embodiment of the present disclosure. [Figure 10] FIG. 23 is a diagram showing an example of a table according to the sixth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, the same components or processes are denoted by the same reference numerals, and redundant description may be omitted.

[0009] Next, the technology of the present disclosure will be described in the order of items shown below. [Embodiment 1] [Configuration of Wireless Communication System] [Configuration of Portable Communication Device] [Operation of Portable Communication Device] [Embodiment 2] [Operation of Portable Communication Device] [Embodiment 3] [Operation of Portable Communication Device] [Embodiment 4] [Operation of Portable Communication Device] [Determination of R / W Type] [Determination Example 1] [Determination Example 2] [Embodiment 5] [Operation of Portable Communication Device] [Embodiment 6] [Operation of Portable Communication Device] [Embodiment 7] [Operation of Portable Communication Device] [Embodiment 8] [Effects of the Disclosed Technology]

[0010] [Embodiment 1] [Configuration of Wireless Communication System] FIG. 1 is a diagram showing a configuration example of a wireless communication system according to Embodiment 1 of the present disclosure. In FIG. 1, the wireless communication system 1 includes a reader / writer 10 and a portable communication device 20. The portable communication device 20 communicates with the reader / writer 10 using a short-range wireless communication technology such as NFC (Near Field Communication). For example, the reader / writer 10 transmits a carrier signal of 13.56 [MHz]. The portable communication device 20 receives the carrier signal transmitted from the reader / writer 10, and transmits a response signal, which is a wireless signal generated by load modulation with respect to the received carrier signal, to the reader / writer 10. The reader / writer 10 receives the response signal transmitted from the portable communication device 20. Examples of the portable communication device 20 include smart devices such as smartphones and tablet terminals.

[0011] [Configuration of Portable Communication Device] Fig. 2 is a diagram showing a configuration example of a mobile communication device according to the first embodiment of the present disclosure. In Fig. 2, the mobile communication device 20 includes a wireless communication module 21, a CPU (Central Processing Unit) 22, a memory 23, a microphone 24, a speaker 25, a touch panel 26, a temperature sensor 27, and a position sensor 28. The wireless communication module 21 includes an antenna 21A, a wireless processing unit 21W, and a processor 21P. Examples of the processor 21P include a DSP (Digital Signal Processor) and an FPGA (Field Programmable Gate Array). The wireless processing unit 21W includes a matching circuit (not shown) that matches with the antenna 21A.

[0012] <Mobile communication device operation> The carrier signal transmitted from the reader / writer 10 is received by the wireless communication module 21 via the antenna 21A of the portable communication device 20.

[0013] In the wireless communication module 21, the wireless processing unit 21W generates a response signal by load modulation for the carrier signal received via the antenna 21A under the control of the processor 21P, and transmits the generated response signal to the reader / writer 10 via the antenna 21A. The wireless processing unit 21W generates the response signal by performing load modulation on the carrier signal using an ASK (Amplitude Shift Keying) modulation method.

[0014] Data (hereinafter sometimes referred to as "resonant frequency data") indicating a resonant frequency (hereinafter sometimes referred to as "module resonant frequency") in wireless communication module 21 is stored in advance in memory 23. The module resonant frequency is determined by the configurations of antenna 21A and wireless processing unit 21W. In addition, the module resonant frequency is measured in advance during a shipping test before shipping of mobile communication device 20.

[0015] Further, the memory 23 stores in advance a table in which the module resonant frequency [Hz] is associated with the phase [degree] of the response signal transmitted from the wireless communication module 21 (hereinafter, may be referred to as the "response signal phase"). FIG. 3 is a diagram showing an example of a table according to the first embodiment of the present disclosure. As shown in FIG. 3, the table TA has a plurality of ranges of the module resonant frequency and an optimal response signal phase for each range of the module resonant frequency associated with each other. In the table TA, for example, when the module resonant frequency is equal to or greater than FA and less than FB, the optimal response signal phase is PA, when the module resonant frequency is equal to or greater than FB and less than FC, the optimal response signal phase is PB, and when the module resonant frequency is equal to or greater than FC and less than FD, the optimal response signal phase is PC.

[0016] Here, the response signal phase in table TA may be either a fixed value or a variable value that changes according to the module resonant frequency. When the response signal phase in table TA is a variable value, each response signal phase in table TA is set as a function of the module resonant frequency.

[0017] The CPU 22 acquires the resonance frequency data from the memory 23, and acquires the response signal phase corresponding to the module resonance frequency from the table TA by referring to the table TA based on the module resonance frequency indicated by the acquired resonance frequency data. For example, when the module resonance frequency is equal to or greater than FA and less than FB, the response signal phase of "PA" is acquired, when the module resonance frequency is equal to or greater than FB and less than FC, the response signal phase of "PB" is acquired, and when the module resonance frequency is equal to or greater than FC and less than FD, the response signal phase of "PC" is acquired. The CPU 22 instructs the processor 21P to set the response signal phase acquired in this manner to the wireless processing unit 21W.

[0018] The processor 21P sets the response signal phase acquired from the table TA by the CPU 22 in the wireless processing unit 21W in accordance with an instruction from the CPU 22. As a result, the optimal response signal phase according to the module resonant frequency is set in the wireless processing unit 21W.

[0019] The wireless processing unit 21W generates a response signal having a response signal phase set by the processor 21P, and transmits the generated response signal via the antenna 21A to the reader / writer 10. The reader / writer 10 receives the response signal transmitted from the wireless processing unit 21W.

[0020] The first embodiment has been described above.

[0021] [Embodiment 2] <Mobile communication device operation> The following describes the differences from the first embodiment.

[0022] The optimum modulation depth of the response signal transmitted from the portable communication device 20 to the reader / writer 10 also varies depending on the module resonant frequency.

[0023] Therefore, the memory 23 stores in advance a table in which the module resonant frequency [Hz] is associated with the modulation depth [%] of the load modulation performed by the wireless processing unit 21W. FIG. 4 is a diagram showing an example of a table according to the second embodiment of the present disclosure. As shown in FIG. 4, in the table TB, a plurality of ranges of the module resonant frequency and an optimal modulation depth for each range of the module resonant frequency are associated with each other. In the table TB, for example, when the module resonant frequency is equal to or greater than FA and less than FB, the optimal modulation depth is MA, when the module resonant frequency is equal to or greater than FB and less than FC, the optimal modulation depth is MB, and when the module resonant frequency is equal to or greater than FC and less than FD, the optimal modulation depth is MC.

[0024] Here, the modulation depth in table TB may be either a fixed value or a variable value that changes according to the module resonant frequency. When the modulation depth in table TB is a variable value, each modulation depth in table TB is set as a function of the module resonant frequency.

[0025] The CPU 22 acquires the resonance frequency data from the memory 23, and acquires the modulation depth corresponding to the module resonance frequency from the table TB by referring to the table TB based on the module resonance frequency indicated by the acquired resonance frequency data. For example, when the module resonance frequency is equal to or greater than FA and less than FB, the modulation depth of "MA" is acquired, when the module resonance frequency is equal to or greater than FB and less than FC, the modulation depth of "MB" is acquired, and when the module resonance frequency is equal to or greater than FC and less than FD, the modulation depth of "MC" is acquired. The CPU 22 instructs the processor 21P to set the modulation depth acquired in this manner to the wireless processing unit 21W.

[0026] The processor 21P sets the modulation depth acquired from the table TB by the CPU 22 in the wireless processing unit 21W in accordance with an instruction from the CPU 22. As a result, the optimal modulation depth according to the module resonant frequency is set in the wireless processing unit 21W.

[0027] The wireless processing unit 21W generates a response signal that is load modulated at the modulation depth set by the processor 21P, and transmits the generated response signal to the reader / writer 10 via the antenna 21A. The reader / writer 10 receives the response signal transmitted from the wireless processing unit 21W.

[0028] The second embodiment has been described above.

[0029] [Embodiment 3] <Mobile communication device operation> The following describes the differences from the first and second embodiments.

[0030] In the wireless communication module 21, the wireless processing unit 21W measures the received signal strength [dBm] of the carrier signal received via the antenna 21A, and outputs the measurement result of the received signal strength to the processor 21P. The processor 21P notifies the CPU 22 of the measurement result of the received signal strength.

[0031] It is estimated that the smaller the received signal strength is, the greater the distance between the reader / writer 10 and the portable communication device 20 is.

[0032] Therefore, the memory 23 stores in advance a table in which the received signal strength of the carrier signal and the transmission power [dBm] of the response signal transmitted from the wireless communication module 21 are associated with each other. FIG. 5 is a diagram showing an example of a table according to the third embodiment of the present disclosure. As shown in FIG. 5, the table TC has a plurality of ranges of received signal strength and optimal transmission powers for each range of received signal strength associated with each other. In the table TC, for example, the optimal transmission power when the received signal strength is equal to or greater than RA and less than RB is VA, the optimal transmission power when the received signal strength is equal to or greater than RB and less than RC is VB, and the optimal transmission power when the received signal strength is equal to or greater than RC and less than RD is VC. In addition, the relationship between the transmission powers in the table TC is "VA>VB>VC>VD>VE>VF". In other words, the smaller the received signal strength of the carrier signal, the higher the optimal transmission power of the response signal.

[0033] Here, the transmission power in table TC may be either a fixed value or a variable value that changes according to the received signal strength. When the transmission power in table TC is a variable value, each transmission power in table TC is set as a function of the received signal strength.

[0034] The CPU 22 refers to the table TC based on the received signal strength notified from the processor 21P, and acquires the transmission power corresponding to the received signal strength from the table TC. For example, when the received signal strength is equal to or greater than RA but less than RB, the transmission power of "VA" is acquired, when the received signal strength is equal to or greater than RB but less than RC, the transmission power of "VB" is acquired, and when the received signal strength is equal to or greater than RC but less than RD, the transmission power of "VC" is acquired. The CPU 22 instructs the processor 21P to set the transmission power acquired in this manner to the wireless processing unit 21W.

[0035] The processor 21P sets the transmission power acquired from the table TC by the CPU 22 in the wireless processing unit 21W in accordance with an instruction from the CPU 22. As a result, the optimal transmission power according to the received signal strength is set in the wireless processing unit 21W.

[0036] The wireless processing unit 21W transmits a response signal at the transmission power set by the processor 21P via the antenna 21A to the reader / writer 10. The reader / writer 10 receives the response signal transmitted from the wireless processing unit 21W.

[0037] The third embodiment has been described above.

[0038] [Embodiment 4] <Mobile communication device operation> The following describes the differences from the first to third embodiments.

[0039] The memory 23 stores in advance a table in which the module resonant frequency, the response signal phase, and the modulation depth of the load modulation performed in the wireless processing unit 21W are associated with each other for each type of reader / writer 10. Figs. 6 and 7 are diagrams showing examples of tables according to the fourth embodiment of the present disclosure. Fig. 6 shows a table TD1 for a reader / writer 10 whose type (hereinafter sometimes referred to as "R / W type") of the reader / writer 10 that has transmitted a carrier signal to the mobile communication device 20, that is, whose type (hereinafter sometimes referred to as "R / W type") of the reader / writer 10 that receives a response signal transmitted from the mobile communication device 20 is "RWA", and Fig. 7 shows a table TD2 for a reader / writer 10 whose R / W type is "RWB".

[0040] A reader / writer 10 whose R / W type is "RWA" is, for example, a reader / writer 10 for Suica (registered trademark), and a reader / writer 10 whose R / W type is "RWB" is, for example, a reader / writer 10 for Edy (registered trademark).

[0041] As shown in Fig. 6 and Fig. 7, in the tables TD1 and TD2, a plurality of ranges of module resonant frequencies, optimal response signal phases for each range of module resonant frequencies, and optimal modulation depths for each range of module resonant frequencies are set in correspondence with each other for each R / W type. In the table TD1 (Fig. 6), for example, the optimal response signal phase and modulation depth when the module resonant frequency is equal to or greater than FA and less than FB are PA1 and MA1, the optimal response signal phase and modulation depth when the module resonant frequency is equal to or greater than FB and less than FC are PB1 and MB1, and the optimal response signal phase and modulation depth when the module resonant frequency is equal to or greater than FC and less than FD are PC1 and MC1. On the other hand, in the table TD2 (Fig. 7), for example, the optimal response signal phase and modulation depth when the module resonant frequency is equal to or greater than FA and less than FB are PA2 and MA2, the optimal response signal phase and modulation depth when the module resonant frequency is equal to or greater than FB and less than FC are PB2 and MB2, and the optimal response signal phase and modulation depth when the module resonant frequency is equal to or greater than FC and less than FD are PC2 and MC2. In this way, the optimal response signal phase and modulation depth for the same module resonant frequency differ depending on the R / W type.

[0042] The CPU 22 determines the type of the reader / writer 10 that transmitted the carrier signal to the mobile communication device 20. In addition, the CPU 22 obtains the resonance frequency data from the memory .

[0043] The CPU 22 refers to either table TD1 or table TD2 based on the module resonant frequency indicated by the acquired resonant frequency data, and acquires the response signal phase and modulation depth corresponding to the module resonant frequency from table TD1 or table TD2. When the CPU 22 determines that the R / W type is "RWA", it refers to table TD1, and when the CPU 22 determines that the R / W type is "RWB", it refers to table TD2. Then, the CPU 22 instructs the processor 21P to set the acquired response signal phase and modulation depth in the wireless processing unit 21W.

[0044] The processor 21P sets, according to an instruction from the CPU 22, the response signal phase and modulation depth acquired from the table TD1 or the table TD2 by the CPU 22 in the wireless processing unit 21W. Thereby, for each R / W type, an optimal response signal phase and modulation depth corresponding to the module resonance frequency are set in the wireless processing unit 21W.

[0045] The wireless processing unit 21W has the response signal phase set by the processor 21P, generates a response signal load-modulated at the modulation depth set by the processor 21P, and transmits the generated response signal to the reader / writer 10 via the antenna 21A. The reader / writer 10 receives the response signal transmitted from the wireless processing unit 21W.

[0046] <Determination of R / W type> Hereinafter, two determination examples, determination example 1 and determination example 2, are exemplified for the determination of the R / W type. The CPU 22 determines the R / W type as in the following determination example 1 or determination example 2.

[0047] <Determination example 1> The R / W type can be specified by the location where the reader / writer 10 is installed (hereinafter sometimes referred to as the "reader / writer installation location"). For example, the reader / writer 10 for Suica (registered trademark) with the R / W type "RWA" is mainly installed at the ticket gate of a station, and the reader / writer 10 for Edy (registered trademark) with the R / W type "RWB" is mainly installed in a specific store.

[0048] Also, when the mobile communication device 20 communicates with the reader / writer 10, the mobile communication device 20 is located in the vicinity of the reader / writer 10.

[0049] Therefore, by detecting the current position of the mobile communication device 20 (hereinafter sometimes referred to as the "mobile communication device position"), the R / W type of the reader / writer 10 communicating with the mobile communication device 20 can be determined.

[0050] Therefore, memory 23 stores in advance table TE in which the R / W type is associated with the reader / writer installation location. In table TE, the reader / writer installation location is registered in table TE as information using, for example, latitude and longitude. Position sensor 28 detects the position of the portable communication device and outputs the detected position of the portable communication device to CPU 22. The position of the portable communication device is detected as information using, for example, latitude and longitude. Position sensor 28 detects the position of the portable communication device using, for example, a Global Positioning System (GPS).

[0051] The CPU 22 determines the R / W type by referring to the table TE based on the mobile communication device position detected by the position sensor 28. The CPU 22 identifies in the table TE a reader / writer installation location within a predetermined range from the mobile communication device position, and determines the R / W type corresponding to the identified reader / writer installation location as the R / W type of the reader / writer 10 that transmitted a carrier signal to the mobile communication device 20. For example, the CPU 22 determines the R / W type of the reader / writer 10 that exists within a 5-meter radius from the mobile communication device position.

[0052] <Judgment Example 2> When the portable communication device 20 communicates with the reader / writer 10, application software (hereinafter sometimes referred to as "app") used to generate data included in a response signal differs for each R / W type. For example, an app for Suica (registered trademark) with an R / W type of "RWA" is different from an app for Edy (registered trademark) with an R / W type of "RWB".

[0053] Therefore, a table TF in which the R / W type and the identification information of the application are associated with each other is stored in advance in the memory 23. The CPU 21 identifies an application currently being executed in the CPU 21 from among applications used for communication with the reader / writer 10. Then, the CPU 21 refers to the table TF based on the identification information of the identified application, and determines the R / W type corresponding to the identification information of the application as the R / W type of the reader / writer 10 that transmitted the carrier wave signal to the mobile communication device 20.

[0054] The fourth embodiment has been described above.

[0055] [Embodiment 5] <Mobile communication device operation> The following describes the differences from the first to fourth embodiments.

[0056] The optimum phase and optimum modulation depth of the response signal transmitted from the portable communication device 20 to the reader / writer 10 also change depending on the temperature.

[0057] Therefore, the temperature sensor 27 detects the temperature inside the mobile communication device 20 (hereinafter, may be referred to as the "device temperature"), and outputs the detection result to the CPU 22. The temperature sensor 27 detects the device temperature at regular time intervals.

[0058] The memory 23 stores in advance a table in which the device temperature [°C], the module resonant frequency, the response signal phase, and the modulation depth of the load modulation performed in the wireless processing unit 21W are associated with each other. FIG. 8 is a diagram showing an example of a table according to the fifth embodiment of the present disclosure. As shown in FIG. 5, the table TG has a plurality of ranges of the device temperature, a plurality of ranges of the module resonant frequency, an optimal response signal phase for each range of the device temperature and the module resonant frequency, and an optimal modulation depth for each range of the device temperature and the module resonant frequency, which are associated with each other. In the table TG, for example, when the device temperature is 20°C or more and less than 25°C, and the module resonant frequency is FA or more and less than FB, the optimal response signal phase and modulation depth are PA and MA. On the other hand, when the device temperature is 25°C or more and less than 30°C, and the module resonant frequency is FA or more and less than FB, the optimal response signal phase and modulation depth are PD and MD. In this way, the optimal response signal phase and modulation depth for the same module resonant frequency differ depending on the device temperature.

[0059] The CPU 22 refers to the table TG based on the device temperature detected by the temperature sensor 27 and the module resonant frequency indicated by the resonant frequency data acquired from the memory 23, and acquires the response signal phase and modulation depth corresponding to the device temperature and the module resonant frequency from the table TG. For example, when the device temperature is 20[°C] or more and less than 25[°C], and the module resonant frequency is FA or more and less than FB, the response signal phase of "PA" and the modulation depth of "MA" are acquired. When the device temperature is 25[°C] or more and less than 30[°C], and the module resonant frequency is FA or more and less than FB, the response signal phase of "PD" and the modulation depth of "MD" are acquired. The CPU 22 instructs the processor 21P to set the response signal phase and modulation depth acquired in this way to the wireless processing unit 21W.

[0060] The processor 21P sets the response signal phase and modulation depth acquired from the table TG by the CPU 22 to the wireless processing unit 21W in accordance with an instruction from the CPU 22. As a result, the optimal response signal phase and modulation depth according to the device temperature and module resonant frequency are set in the wireless processing unit 21W.

[0061] The wireless processing unit 21W generates a response signal that has a response signal phase set by the processor 21P and is load modulated at the modulation depth set by the processor 21P, and transmits the generated response signal to the reader / writer 10 via the antenna 21A. The reader / writer 10 receives the response signal transmitted from the wireless processing unit 21W.

[0062] In addition, the CPU 22 changes the response signal phase and modulation depth set in the wireless processing unit 21W only when the amount of change in the device temperature over a specified period of time (hereinafter sometimes referred to as the "device temperature change amount") becomes equal to or greater than a threshold value, and when the amount of change in the device temperature is less than the threshold value, the CPU 22 may maintain the response signal phase and modulation depth already set in the wireless processing unit 21W.

[0063] The fifth embodiment has been described above.

[0064] [Embodiment 6] <Mobile communication device operation> It is also possible to appropriately combine some of the first to fifth embodiments. For example, the memory 23 stores in advance a table in which the correspondence between the device temperature, the module resonant frequency, the received signal strength, the response signal phase, the modulation depth of the load modulation performed in the wireless processing unit 21W, and the transmission power of the response signal transmitted from the wireless communication module 21 is set for each type of the reader / writer 10. Figs. 9 and 10 are diagrams showing examples of tables according to the sixth embodiment of the present disclosure. Fig. 9 shows a table TH1 for the reader / writer 10 whose R / W type is "RWA", and Fig. 10 shows a table TH2 for the reader / writer 10 whose R / W type is "RWB".

[0065] As shown in Figures 9 and 10, in tables TH1 and TH2, for each R / W type, multiple ranges of device temperature, multiple ranges of module resonant frequency, multiple ranges of received signal strength, and optimal response signal phases, modulation depths, and transmission powers for each range of device temperature, module resonant frequency, and received signal strength are set in correspondence with each other.

[0066] The CPU 22 determines the R / W type. The CPU 22 also obtains the device temperature from the temperature sensor 27, obtains resonance frequency data indicating the module resonance frequency from the memory 23, and obtains the measurement result of the received signal strength from the processor 21P.

[0067] The CPU 22 refers to either table TH1 or table TH2 based on the device temperature, the module resonant frequency, and the received signal strength, and acquires from table TH1 or table TH2 the response signal phase, modulation depth, and transmission power corresponding to the device temperature, the module resonant frequency, and the received signal strength. When the CPU 22 determines that the R / W type is "RWA", it refers to table TH1, and when the CPU 22 determines that the R / W type is "RWB", it refers to table TH2. Then, the CPU 22 instructs the processor 21P to set the acquired response signal phase, modulation depth, and transmission power in the wireless processing unit 21W.

[0068] The processor 21P sets, in the wireless processing unit 21W, the response signal phase, modulation depth, and transmission power acquired from the table TH1 or table TH2 by the CPU 22 in accordance with an instruction from the CPU 22. As a result, the optimal response signal phase, modulation depth, and transmission power according to the device temperature, module resonance frequency, and received signal strength for each R / W type are set in the wireless processing unit 21W.

[0069] The wireless processing unit 21W generates a response signal that has a response signal phase set by the processor 21P and is load modulated at the modulation depth set by the processor 21P, and transmits the generated response signal to the reader / writer 10 via the antenna 21A at the transmission power set by the processor 21P. The reader / writer 10 receives the response signal transmitted from the wireless processing unit 21W.

[0070] The sixth embodiment has been described above.

[0071] [Embodiment 7] <Mobile communication device operation> The following describes the differences from the first embodiment.

[0072] In the first embodiment, the module resonant frequency is measured in advance during a shipping test before shipping of the mobile communication device 20, and resonant frequency data indicating the module resonant frequency measured during the shipping test is stored in advance in the memory 23.

[0073] In contrast, in the seventh embodiment, the processor 21P measures the module resonant frequency, which changes from time to time, under an instruction from the CPU 22. The CPU 22 outputs an instruction to measure the module resonant frequency to the processor 21P. The CPU 22 outputs a measurement instruction to the processor 21P, for example, at regular time intervals. The processor 21P measures the module resonant frequency in the wireless processing unit 21W according to the measurement instruction from the CPU 22, and outputs the measurement result to the CPU 22. The CPU 22 acquires a response signal phase corresponding to the module resonant frequency from the table TA by referring to the table TA in the same manner as in the first embodiment, based on the measurement result of the module resonant frequency. The CPU 22 instructs the processor 21P to set the response signal phase acquired from the table TA to the wireless processing unit 21W.

[0074] The processor 21P sets the response signal phase acquired from the table TA by the CPU 22 in the wireless processing unit 21W in accordance with an instruction from the CPU 22. As a result, the optimal response signal phase according to the module resonant frequency is set in the wireless processing unit 21W.

[0075] The wireless processing unit 21W generates a response signal having a response signal phase set by the processor 21P, and transmits the generated response signal via the antenna 21A to the reader / writer 10. The reader / writer 10 receives the response signal transmitted from the wireless processing unit 21W.

[0076] In addition, when the difference between the module resonant frequency measured during shipping test and the module resonant frequency measured by processor 21P is equal to or greater than a threshold value, CPU 22 may determine that an object (e.g., metal, etc.) that affects the module resonant frequency is present around mobile communication device 20, and maintain the response signal phase already set in wireless processing unit 21W.

[0077] Furthermore, the measurement of the module resonant frequency in the seventh embodiment can be used in place of the acquisition of resonant frequency data in not only the first embodiment but also the second and fourth to sixth embodiments.

[0078] The seventh embodiment has been described above.

[0079] [Embodiment 8] All or part of each process in the above description in the CPU 22 may be realized by making the CPU 22 execute a program corresponding to each process. For example, a program corresponding to each process in the above description may be stored in the memory 23, and the program may be read from the memory 23 by the CPU 22 and executed. The program may be stored in a program server connected to the mobile communication device 20 via an arbitrary network, downloaded from the program server to the mobile communication device 20 and executed, or stored in a recording medium readable by the mobile communication device 20, read from the recording medium and executed. Examples of recording media readable by the mobile communication device 20 include portable storage media such as memory cards, USB memories, SD cards, flexible disks, magneto-optical disks, CD-ROMs, DVDs, and Blu-ray (registered trademark) disks. The program is a data processing method described in any language or any description method, and may be in any format such as source code or binary code. The program is not necessarily limited to a single program, but may be a program that is distributed as multiple modules or multiple libraries, or a program that achieves its function by working with a separate program such as an OS.

[0080] The eighth embodiment has been described above.

[0081] [Effects of the disclosed technology] As described above, the wireless communication device (portable communication device 20 of the embodiment) of the present disclosure includes a wireless communication module (wireless communication module 21W of the embodiment) and a CPU (CPU 22 of the embodiment). The wireless communication module transmits a wireless signal (response signal of the embodiment). The CPU sets the phase of the wireless signal (response signal phase of the embodiment) based on the resonant frequency of the wireless communication module (module resonant frequency of the embodiment).

[0082] In this way, the phase of the wireless signal transmitted by the wireless communication device can be automatically set to an optimal phase according to the resonant frequency of the wireless communication module, so that the communication characteristics of the wireless communication device can be guaranteed. Also, since it is no longer necessary to mount an additional component such as a variable capacitor for adjusting the resonant frequency to a resonant frequency at which an optimal phase is obtained, the wireless communication device can be made smaller. Furthermore, since the phase of the wireless signal can be automatically set to an optimal phase according to the resonant frequency of the wireless communication module, the calibration that was conventionally performed at the time of shipment of the wireless communication device is no longer necessary.

[0083] The CPU also sets the modulation depth of the wireless signal based on the resonant frequency in the wireless communication module.

[0084] In this way, the modulation depth of the wireless signal transmitted by the wireless communication device can be automatically set to the optimal modulation depth according to the resonant frequency of the wireless communication module, thereby ensuring the communication characteristics of the wireless communication device.

[0085] Moreover, the CPU further sets the transmission power of the wireless signal based on the received signal strength in the wireless communication module.

[0086] In this way, the transmission power of the wireless signal transmitted by the wireless communication device can be automatically set to the optimum transmission power according to the received signal strength, thereby ensuring the communication characteristics of the wireless communication device.

[0087] Furthermore, the CPU sets the phase of the wireless signal based on the resonant frequency in the wireless communication module and the temperature inside the wireless communication device (device temperature in the embodiment).

[0088] In this way, the phase of the wireless signal transmitted by the wireless communication device can be automatically set to an optimal phase in response to temperature changes, thereby ensuring the communication characteristics of the wireless communication device.

[0089] In addition, the CPU sets the phase of the wireless signal based on the resonant frequency in the wireless communication module and the type (R / W type in the embodiment) of the device (reader / writer 10 in the embodiment) that receives the wireless signal transmitted using the wireless communication module.

[0090] For example, the CPU determines the type of device receiving the wireless signal based on the current location of the wireless communication device (the location of the mobile communication device in the embodiment).

[0091] Also, for example, the CPU determines the type of device receiving the wireless signal based on the running application used to generate the data included in the wireless signal.

[0092] In this way, the phase of the radio signal transmitted by the wireless communication device can be automatically set to the optimal phase according to the type of device receiving the radio signal, thereby ensuring the communication characteristics of the wireless communication device regardless of the type of device receiving the radio signal.

[0093] The effects described in this specification are merely examples and are not limiting, and other effects may also be present.

[0094] The disclosed technology can also be configured as follows. (1) a wireless communication module for transmitting wireless signals; A CPU that sets a phase of the wireless signal based on a resonant frequency in the wireless communication module; A wireless communication device comprising: (2) The CPU further sets a modulation depth of the wireless signal based on the resonant frequency. The wireless communication device according to (1). (3) The CPU further sets a transmission power of the wireless signal based on a received signal strength in the wireless communication module. The wireless communication device according to (1). (4) The CPU sets the phase based on the resonant frequency and a type of a device that receives the wireless signal transmitted by the wireless communication module. The wireless communication device according to (1). (5) A position sensor for detecting a current position of the device itself is further provided. The CPU determines the type based on the current location. The wireless communication device according to (4). (6) the CPU determines the type based on running application software used to generate the data included in the wireless signal; The wireless communication device according to (4). (7) A temperature sensor for detecting a temperature inside the device itself is further provided. The CPU sets the phase based on the resonant frequency and the temperature. The wireless communication device according to (1). (8) setting a phase of the wireless signal based on a resonant frequency in the wireless communication module; transmitting the wireless signal having the phase using the wireless communication module; A wireless communication method. (9) Acquire a resonant frequency in a wireless communication module that transmits a wireless signal; setting a phase of the radio signal based on the resonant frequency; A program that causes the CPU to execute a process. [Explanation of symbols]

[0095] 1. Wireless communication systems 10 Reader / Writer 20 Portable communication devices 21 Wireless communication module 21A Antenna 21W Wireless Processing Unit 21P Processor 22 CPU 23 Memory 27 Temperature Sensor 28 Position Sensor

Claims

1. A wireless communication device, a wireless communication module for transmitting wireless signals; a CPU that sets a phase of the wireless signal based on a resonant frequency of the wireless communication module and a type of a device that receives the wireless signal transmitted using the wireless communication module; a location sensor for detecting a current location of the wireless communication device; Equipped with The CPU further determines the type based on the current position. Wireless communication device.

2. The CPU further sets a modulation depth of the wireless signal based on the resonant frequency. The wireless communication device of claim 1 .

3. The CPU further sets a transmission power of the wireless signal based on a received signal strength in the wireless communication module. The wireless communication device of claim 1 .

4. The CPU further determines the type based on running application software used to generate the data included in the wireless signal. The wireless communication device of claim 1 .

5. a temperature sensor for detecting a temperature inside the wireless communication device; The CPU sets the phase based on the resonance frequency and the temperature. The wireless communication device of claim 1 .

6. A CPU provided in a wireless communication device, setting a phase of the wireless signal based on a resonant frequency of the wireless communication module and a type of device that receives the wireless signal transmitted by using the wireless communication module; transmitting the wireless signal having the phase using the wireless communication module; 1. A wireless communication method, comprising: and determining the type based on a current location of the wireless communication device detected by a position sensor that detects the current location of the wireless communication device. A wireless communication method.

7. setting a phase of the wireless signal based on a resonant frequency of the wireless communication module and a type of device that receives the wireless signal transmitted by using the wireless communication module; transmitting the wireless signal having the phase using the wireless communication module; A program for causing a CPU to execute a process, and determining the type based on a current location detected by a position sensor that detects a current location of the wireless communication device including the CPU. program.

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