JP2006080763A - Wireless communication device, communication control method, recording medium, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the communication quality of a noncontact IC card function. <P>SOLUTION: Upon receiving a transmission power reduction start command from an external reader/writer through an antenna 24, a noncontact IC card 25 delivers a transmission power reduction start designation signal to a CPU 21. The CPU 21 controls a transmission amplifier 13 to lower the transmission power of a portable telephone transmission signal transmitted to a base station. Upon receiving a transmission power reduction end command from the external reader/writer through the antenna 24, the noncontact IC card 25 delivers a transmission power reduction end designation signal to the CPU 21. The CPU 21 controls the transmission amplifier 13 to return the transmission power of the portable telephone transmission signal back to a normal level. The invention is applicable to a portable telephone. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wireless communication device, a communication control method, a recording medium, and a program, and relates to a wireless communication device having a non-contact IC card function and another wireless communication function different from the non-contact IC card function, a communication control method, and a recording The present invention relates to a medium and a program.

  In recent years, management systems for commuter pass information and electronic money information using non-contact IC cards have become widespread, and users can approach non-contact IC cards holding commuter pass information close to the ticket gates, for example, at ticket gates. It is possible to pass through the ticket gate by simply making it, or to pay the price of the product with electronic money simply by bringing a non-contact IC card holding electronic money information close to the reader / writer.

By the way, there is a mobile phone as one of the items that the user always carries, and a mobile phone equipped with the above-described non-contact IC card function has been proposed (for example, see Patent Document 1) or commercially available. Using the mobile phone, the user can not only perform various communications such as calls and e-mails, but also can pass through the ticket gates or pay for goods.
JP 2002-345037 A

  However, if a non-contact IC card system including an LSI (Large Scale Integration) with an non-contact IC card function or an antenna is incorporated in the case of the mobile phone, the mobile When a transmission signal (carrier wave) (hereinafter referred to as a cellular phone transmission signal) is being output to communicate with a cellular phone base station, when a non-contact IC card function is to be used, the cellular phone is transmitted. Under the influence of the signal, noise is superimposed on a carrier wave (hereinafter referred to as a non-contact IC card carrier wave) transmitted and received between the mobile phone and an external non-contact IC card wireless reader / writer, and the mobile phone and the external wireless There has been a problem that the quality of communication with the reader / writer (hereinafter referred to as non-contact IC card communication) is deteriorated.

  The present invention has been made in view of such circumstances, and is intended to improve the quality of contactless IC card communication.

  The wireless communication device of the present invention is a wireless communication device having a non-contact IC card function and another wireless communication function different from the non-contact IC card function, according to communication with a wireless reader / writer for the non-contact IC card. An instruction means for instructing to lower the transmission power of a signal to be transmitted in another communication function; and a transmission power control means for controlling the transmission power to lower the transmission power according to an instruction from the instruction means, To do.

  The instructing unit can instruct to reduce the transmission power of the transmission signal based on an instruction from the wireless reader / writer.

  Carrier detection means for detecting reception of a carrier wave transmitted from the wireless reader / writer is further included, and the instruction means instructs to lower the transmission power while reception of the carrier wave is detected by the carrier wave detection means. Can do.

  The instructing means may instruct to reduce the transmission power from the start of the reception of the command from the wireless reader / writer until the end of transmission of the response signal to the command to the wireless reader / writer. it can.

  The instructing means can instruct the transmission power to be lowered while communication of a predetermined service is performed with the wireless reader / writer.

  The transmission power control means controls the transmission power so as to reduce the transmission power when communication by another wireless communication function is performed when the instruction means instructs to reduce the transmission power. Can do.

  Another wireless communication function may be a communication function based on a communication standard of a mobile phone or a personal handyphone system (PHS).

  The communication control method of the present invention is a communication control method for a wireless communication apparatus having a contactless IC card function and another wireless communication function different from the contactless IC card function, and a wireless reader / writer for a contactless IC card An instruction step for instructing to lower the transmission power of a signal to be transmitted in another communication function according to communication with the transmission power, and a transmission power control for controlling the transmission power to lower the transmission power by an instruction by the processing of the instruction step And a step.

  The program recorded on the recording medium of the present invention is a program for a computer of a wireless communication device having a non-contact IC card function and another wireless communication function different from the non-contact IC card function. An instruction step for instructing to reduce the transmission power of a signal to be transmitted in another communication function according to communication with the card wireless reader / writer, and a transmission power to reduce the transmission power by an instruction by the processing of the instruction step. A transmission power control step for controlling the transmission power.

  The program of the present invention is a program for causing a computer of a wireless communication apparatus having a contactless IC card function and another wireless communication function different from the contactless IC card function to perform communication control processing. In response to communication with the wireless reader / writer, an instruction step for instructing to reduce the transmission power of a signal transmitted in another communication function, and the transmission power is controlled to reduce the transmission power by an instruction by the processing of the instruction step. And a transmission power control step.

  In the wireless communication device, the communication control method, the recording medium, and the program of the present invention, transmission is performed in another communication function different from the non-contact IC card function in response to communication with the wireless reader / writer for the non-contact IC card. An instruction is given to reduce the transmission power of the signal, and the transmission power is controlled to reduce the transmission power.

  ADVANTAGE OF THE INVENTION According to this invention, it can communicate with the reader / writer for external non-contact IC cards. Further, according to the present invention, it is possible to improve communication quality with an external non-contact IC card reader / writer.

  Embodiments of the present invention will be described below. Correspondences between constituent elements described in the claims and specific examples in the embodiments of the present invention are exemplified as follows. This description is to confirm that specific examples supporting the invention described in the claims are described in the embodiments of the invention. Therefore, even though there are specific examples that are described in the embodiment of the invention but are not described here as corresponding to the configuration requirements, the specific examples are not included in the configuration. It does not mean that it does not correspond to a requirement. On the contrary, even if a specific example is described here as corresponding to a configuration requirement, this means that the specific example does not correspond to a configuration requirement other than the configuration requirement. not.

  Further, this description does not mean that all the inventions corresponding to the specific examples described in the embodiments of the invention are described in the claims. In other words, this description is an invention corresponding to the specific example described in the embodiment of the invention, and the existence of an invention not described in the claims of this application, that is, in the future, a divisional application will be made. Nor does it deny the existence of an invention added by amendment.

  The wireless communication device according to claim 1 (for example, the mobile phone 1 of FIG. 1) is different from the contactless IC card function and the wireless communication function different from the contactless IC card function (for example, according to a communication standard of a mobile phone). Of a signal transmitted in the other communication function in response to communication with a wireless reader / writer for a non-contact IC card (for example, reader / writer 72 in FIG. 2). Instructing means (for example, CPU 103 in FIG. 3) for instructing to reduce transmission power (for example, mobile phone transmission power), and transmission power for controlling the transmission power to decrease the transmission power in accordance with an instruction from the instructing means And a control means (for example, the transmission power control unit 122 in FIG. 4).

  In the wireless communication apparatus (for example, the mobile phone 1 of FIG. 1) according to claim 2, the instruction unit is configured to transmit the transmission signal based on an instruction (for example, a transmission power reduction start command) from the wireless reader / writer. It is characterized by instructing to reduce the transmission power.

  In the wireless communication apparatus according to claim 3 (for example, the cellular phone 1 in FIG. 1), carrier detection means (for example, the analog front end unit 101 in FIG. 3) that detects reception of the carrier transmitted from the wireless reader / writer. ), And the instruction means instructs to reduce the transmission power while reception of the carrier wave is detected by the carrier wave detection means.

  The communication control method according to claim 8 includes a non-contact IC card function and another wireless communication function different from the non-contact IC card function (for example, a communication function based on a communication standard of a mobile phone). (For example, the cellular phone 1 in FIG. 1) in the other communication function according to communication with a wireless reader / writer for a non-contact IC card (for example, the reader / writer 72 in FIG. 2). An instruction step (for example, step S2 in FIG. 5) for instructing to lower the transmission power (for example, mobile phone transmission power) of a signal to be transmitted, and the transmission power to be reduced by an instruction by the processing of the instruction step. And a transmission power control step (for example, step S5 in FIG. 5) for controlling the transmission power.

  The program recorded on the recording medium according to claim 9 (for example, the magnetic disk 51, the optical disk 52, the magneto-optical disk 53, or the semiconductor memory 54 in FIG. 1) includes a non-contact IC card function and the non-contact IC. A non-contact program for a computer of a wireless communication apparatus (for example, the mobile phone 1 in FIG. 1) having another wireless communication function (for example, a communication function based on a mobile phone communication standard) different from the card function Instructs to lower the transmission power (for example, mobile phone transmission power) of signals transmitted in the other communication function in response to communication with a wireless reader / writer for IC card (for example, reader / writer 72 in FIG. 2). The transmission power is controlled to decrease the transmission power according to an instruction step (for example, step S2 in FIG. 5) and an instruction by the processing of the instruction step. Transmission power control step (e.g., step S5 in FIG. 5), characterized in that it comprises a.

  A program according to claim 10 is a wireless communication device having a non-contact IC card function and another wireless communication function (for example, a communication function based on a mobile phone communication standard) different from the non-contact IC card function (for example, 1 is a program for causing a computer of the cellular phone 1) in FIG. 1 to perform communication control processing, in accordance with communication with a wireless reader / writer for a non-contact IC card (for example, the reader / writer 72 in FIG. 2). An instruction step (for example, step S2 in FIG. 5) for instructing to reduce transmission power (for example, mobile phone transmission power) of a signal to be transmitted in another communication function, and an instruction by the processing of the instruction step, the transmission power And a transmission power control step (for example, step S5 in FIG. 5) for controlling the transmission power so as to reduce the transmission power.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of a mobile phone 1 having a non-contact IC card function to which the present invention is applied. The mobile phone 1 includes an antenna 11, a transmission unit 12, a transmission amplifier 13, a reception unit 14, a DSP (Digital Signal Processor) 15, a sound processing unit 16, a speaker 17, a microphone 18, a display unit 19, an input unit 20, a CPU (Central It comprises a processing unit (ROM) 21, a read only memory (ROM) 22, a random access memory (RAM) 23, an antenna 24, and a non-contact IC card unit 25.

  The transmission unit 12 performs predetermined processing (for example, digital-analog conversion processing and frequency conversion processing) on the audio information supplied from the DSP 15 under the control of the CPU 21, and transmits the audio signal obtained as a result thereof. This is supplied to the amplifier 13.

  Under the control of the CPU 21, the transmission amplifier 13 amplifies the transmission power of the transmission signal supplied from the transmission unit 12 (hereinafter referred to as mobile phone transmission power) to a predetermined value, and the amplified transmission signal (carrier wave) is amplified. Then, the data is transmitted to the base station 71 shown in FIG.

  The receiving unit 14 receives the RF signal transmitted from the base station 71 through the antenna 11 under the control of the CPU 21 and performs predetermined processing (for example, signal amplification, frequency conversion processing, analog processing) on the RF signal. Digital conversion processing and the like are performed, and the audio information obtained as a result is output to the DSP 15.

  In addition, in the transmission unit 12, the transmission amplifier 13, and the reception unit 14, for example, communication conforming to a PDC (Personal Digital Cellular) method or a W-CDMA (Wideband-Code Division Multiple Access) method (hereinafter, a mobile phone) Called communication).

  Under the control of the CPU 21, the DSP 15 performs, for example, spectrum despreading processing on the audio information supplied from the receiving unit 14, and outputs the resulting data to the audio processing unit 16. In addition, the DSP 15 performs, for example, spread spectrum processing on the audio information supplied from the audio processing unit 16, and outputs the data obtained as a result to the transmission unit 12.

  The voice processing unit 16 converts the user's voice collected by the microphone 18 into voice information under the control of the CPU 21 and outputs the voice information to the DSP 15. The audio processing unit 16 converts the audio information supplied from the DSP 15 into an analog audio signal, and outputs audio based on the analog audio signal from the speaker 17.

  The display unit 19 is configured by an LCD (Liquid Crystal Display) or the like, and displays an image corresponding to information supplied from the CPU 21. The input unit 20 detects user input to various buttons such as a numeric keypad, a call button, and a power button provided on the surface of the casing of the mobile phone 1, and outputs a signal corresponding to the detection to the CPU 21.

  The non-contact IC card unit 25 is configured by an LSI composed of one chip or two or more chips, and the antenna 24 and the non-contact IC card unit 25 constitute one module. The electromagnetic wave (carrier wave) transmitted from the external reader / writer 72 shown in FIG. 2 is received by the antenna 24, and the received electromagnetic wave is converted into an electric signal (hereinafter referred to as a reader / writer transmission signal), and a non-contact IC. It is supplied to the card unit 25. The non-contact IC card unit 25 modulates the response signal to the command or data transmitted from the reader / writer 72 by the reader / writer transmission signal by changing the load between itself and the antenna 24 to thereby change the antenna. 24 to the reader / writer 72.

  The non-contact IC card unit 25 is supplied with power for driving an internal circuit from a battery (not shown) of the mobile phone 1. The internal circuit of the non-contact IC card unit 25 may be configured to be driven by a DC power supply voltage obtained by rectifying and smoothing the reader / writer transmission signal.

  The CPU 21 develops a control program stored in the ROM 22 in the RAM 23 and controls the overall operation of the mobile phone 1 according to the control program.

  A drive 41 is connected to the CPU 21 as necessary. The CPU 21 reads a computer program from the magnetic disk 51, the optical disk 52, the magneto-optical disk 53, the semiconductor memory 54, or the like that is appropriately mounted in the drive 41, and installs it in a non-volatile memory such as an EEPROM (not shown). Further, the CPU 21 supplies the read computer program to the non-contact IC card unit 25 as necessary, and the non-contact IC card unit 25 installs the program in the internal nonvolatile memory 107 (FIG. 3).

  FIG. 3 is a block diagram showing details of a configuration example of the non-contact IC card unit 25 of FIG. The non-contact IC card unit 25 includes an analog front end unit 101, an SPU 102, a CPU 103, an encryption circuit 104, a RAM 105, a ROM 106, a nonvolatile memory 107, and a communication unit 108. The analog front end unit 101 is connected to the SPU 102, and the SPU 102, CPU 103, encryption circuit 104, RAM 105, ROM 106, nonvolatile memory 107, and communication unit 108 are connected to each other via a bus 119.

  The analog front end unit 101 performs predetermined processing (for example, ASK demodulation, signal amplification, A / D conversion, etc.) on the reader / writer transmission signal received from the reader / writer 72 via the antenna 24, and performs the predetermined processing. The reader / writer transmission signal is supplied to the SPU 102. The analog front end unit 101 turns on or off a switch (not shown) provided inside based on response data supplied from the SPU 102, and impedance (reader / writer) of a circuit electromagnetically coupled via the antenna 24. The response signal based on the response data is transmitted to the reader / writer 72 by changing the load of the antenna provided at 72.

  The analog front end unit 101 detects whether an electromagnetic wave (carrier wave) radiated from the reader / writer 72 is received by the antenna 24 by detecting a change in voltage between both ends of the antenna 24. While detecting the reception of the electromagnetic wave radiated from the reader / writer 72, the analog front end unit 101 supplies a signal indicating the detection result (hereinafter referred to as a non-contact IC card communication detection signal) to the CPU 103. The analog front end unit 101 extracts a clock component from the reader / writer transmission signal and supplies the extracted clock component to each unit of the non-contact IC card unit 25 as a clock signal.

  The SPU 102 performs predetermined processing on the reader / writer transmission signal supplied from the analog front-end unit 101 (for example, conversion of a signal encoded by Manchester to an NRZ (Non Return to Zero) system signal, packet consistency And the processed signal is supplied to the CPU 103 via the bus 109. Further, the SPU 102 acquires response data to be transmitted to the reader / writer 72 from the CPU 103 via the bus 109, and performs predetermined processing (for example, packetization of response data, Manchester encoding of response data in the NRZ method) on the acquired response data. Etc.). The SPU 102 supplies response data subjected to predetermined processing to the analog front end unit 101.

  The CPU 103 develops a control program stored in the ROM 106 or the nonvolatile memory 107 in the RAM 105, and controls processing of each unit of the non-contact IC card unit 25 according to the control program. Further, the CPU 103 performs various processes based on commands and data transmitted from the reader / writer 72 by the reader / writer transmission signal. For example, when data writing is instructed by a command transmitted from the reader / writer 72, the CPU 103 stores data obtained from the reader / writer transmission signal in the nonvolatile memory 107. When the CPU 103 is instructed to read data by a command transmitted from the reader / writer 72, the CPU 103 reads the instructed data from the nonvolatile memory 107, generates response data for transmitting the read data, and generates The response data is supplied to the SPU 102 via the bus 109.

  The CPU 103 transmits and receives data and control signals to and from the CPU 21 via the bus 109 and the communication unit 108. For example, the CPU 103 indicates a signal indicating that the mobile phone transmission power is to be reduced (hereinafter referred to as a transmission power reduction start instruction signal), and a signal indicating that the reduction of the mobile phone transmission power is instructed ( Hereinafter, the transmission power reduction end instruction signal is transmitted to the CPU 21.

  The encryption circuit 104 encrypts data or decrypts the encrypted data under the control of the CPU 103.

  The RAM 105 stores a program used in executing the processing of the SPU 102 or the CPU 103, and parameters and data that change as appropriate during the execution.

  The ROM 106 stores basically fixed data among the programs used by the CPU 103 and calculation parameters.

  The nonvolatile memory 107 is configured by a rewritable nonvolatile memory such as an EEPROM, for example. The non-volatile memory 107 stores programs used by the CPU 103 and data used for the non-contact IC card function or the mobile phone function.

  For example, in a management system using a contactless IC card, various services such as services for managing commuter pass information and services for managing electronic money information are provided, and each service has its own service code to identify each service. Is assigned. When using a predetermined service, use the service such as information for securing an area for storing the service data in the nonvolatile memory 107 (hereinafter referred to as a service area), authentication information, and the service code described above. Various management information necessary for this is written into the non-volatile memory 107 by the reader / writer 72 before the service is used for the first time (service is registered). In the data written by the reader / writer 72 using the service, a service area corresponding to the service provided by the reader / writer 72, that is, a service code that matches the service code of the service provided by the reader / writer 72 is registered. Stored in the service area.

  Accordingly, a service area of services that can be received by the mobile phone 1 is secured in the non-volatile memory 107, and conversely, a service in which no service area is secured, that is, a service in which no service code is registered is stored in the mobile phone. 1 cannot be received.

  Further, for each service registered in the non-volatile memory 107, information indicating whether or not the service needs to reduce the mobile phone transmission power during communication of the service (hereinafter referred to as a transmission power reduction target service). (Hereinafter referred to as “transmission power reduction target service information”) is stored in the nonvolatile memory 107. For example, the transmission power reduction target service information is divided and stored in each service area, or is stored in an area other than the service area for all registered services. The setting of the transmission power reduction target service is performed by a user or a service provider that provides the service, for example.

  FIG. 4 is a block diagram illustrating an example of a partial configuration of functions realized by the CPU 21 that executes the control program. When the CPU 21 executes the control program, the communication unit 121, the transmission power control unit 122, and the communication processing control unit 123 are realized.

  The communication unit 121 transmits and receives data and control signals to and from the communication unit 108 of the non-contact IC card unit 25.

  The transmission power control unit 122 acquires a transmission power reduction start instruction signal and a transmission power reduction end instruction signal from the CPU 103 of the non-contact IC card unit 25 via the bus 109 and the communication units 108 and 121. The transmission power control unit 122 controls the transmission amplifier 13 based on the transmission power reduction start instruction signal or the transmission power reduction end instruction signal, as described later with reference to FIGS. Control the value of. The transmission power control unit 122 appropriately supplies a signal indicating the value of the mobile phone transmission power to the communication processing control unit 123.

  The communication processing control unit 123 controls the transmission unit 12, the reception unit 14, the DSP 15, and the voice processing unit 16 to communicate with the base station 71, signal processing of a transmission signal transmitted to the base station 71, and base Signal processing of the received signal received from the station 71 is performed. The communication processing control unit 123 appropriately supplies information indicating the communication status with the base station 71 to the transmission power control unit 122.

  Next, processing executed by the mobile phone 1 will be described with reference to FIGS.

  First, an example of transmission power control processing executed by the mobile phone 1 will be described with reference to the flowchart of FIG. This process is started when the power of the mobile phone 1 is turned on and is finished when the power is turned off.

  For example, when the cellular phone 1 is close to the reader / writer 72, the cellular phone 1 receives a polling signal periodically transmitted from the reader / writer 72 and transmits a response signal to the polling signal to the reader / writer 72. Thereafter, the cellular phone 1 and the reader / writer 72 perform a predetermined procedure (for example, an authentication procedure) between the cellular phone 1 and the reader / writer 72, and communication between the cellular phone 1 and the reader / writer 72. Is established, data is actually written and read.

  The reader / writer 72 establishes a transmission power reduction start command for instructing reduction of the mobile phone transmission power as necessary before establishing the communication with the mobile phone 1 and before actually writing or reading data. Send. The CPU 103 of the non-contact IC card unit 25 receives a transmission power reduction start command from the reader / writer 72 via the antenna 24, the analog front end unit 101, the SPU 102, and the bus 109. Note that the transmission power reduction start command is an arbitrary command that does not necessarily need to be transmitted in communication between the reader / writer 72 and the mobile phone 1.

  In step S <b> 1, the CPU 103 determines whether a transmission power reduction start command is received from the reader / writer 72. When the transmission power reduction start command is transmitted from the reader / writer 72 and it is determined in step S1 that the transmission power reduction start command has been received, the process proceeds to step S2.

  In step S <b> 2, the CPU 103 supplies a transmission power reduction start instruction signal to the transmission power control unit 122 via the bus 109, the communication unit 108, and the communication unit 121.

  For example, when the reader / writer 72 ends the session with the mobile phone 1 after writing or reading data, the reader / writer 72 sends a transmission power reduction end command for instructing the end of reduction of the mobile phone transmission power, if necessary. Send. The CPU 103 receives a transmission power reduction end command from the reader / writer 72 via the antenna 24, the analog front end unit 101, the SPU 102, and the bus 109. Note that the transmission power reduction end command is an arbitrary command that does not necessarily need to be transmitted in communication between the reader / writer 72 and the mobile phone 1.

  In step S <b> 3, the CPU 103 determines whether a transmission power reduction end command has been received from the reader / writer 72. If it is determined that the transmission power reduction end command has not been received, the process proceeds to step S4.

  In step S4, the CPU 103 determines whether or not the contactless IC card communication is finished. When the contactless IC card communication detection signal is supplied from the analog front end unit 101 or when the CPU 103 has stopped supplying the contactless IC card communication detection signal, a predetermined time (for example, 100 milliseconds) has elapsed. If not, that is, if the electromagnetic wave (carrier wave) radiated from the reader / writer 72 is received by the antenna 24, or if a predetermined time has not passed since the reception of the electromagnetic wave is stopped, It is determined that the contact IC card communication has not ended, and the process proceeds to step S5.

  In step S5, the CPU 21 performs transmission power reduction processing. Details of the transmission power reduction process will be described later with reference to FIG. 6, but this process reduces the mobile phone transmission power by a predetermined value.

  Thereafter, the process returns to step S3, and in steps S3 to S5 until it is determined in step S3 that a transmission power reduction end command has been received or in step S4, it is determined that contactless IC card communication has ended. The process is repeatedly executed, and the mobile phone transmission power is lowered step by step by a predetermined value.

  If it is determined in step S3 that a transmission power reduction end command has been received from the reader / writer 72, the process proceeds to step S6.

  If it is determined in step S4 that the contactless IC card communication has ended, that is, if a predetermined time has elapsed since the supply of the contactless IC card communication detection signal was stopped, the process proceeds to step S6. Proceed to Thereby, even when the transmission power reduction end command cannot be received, the loop processing of steps S3 to S5 can be exited.

  In step S <b> 6, the CPU 103 supplies a transmission power reduction end instruction signal to the transmission power control unit 122 via the bus 109, the communication unit 108, and the communication unit 121.

  In step S <b> 7, the transmission power control unit 122 controls the transmission amplifier 13 to return to the normal mobile phone transmission power (before the mobile phone transmission power value is lowered). Thereafter, the processing returns to step S1, and the above-described processing is repeatedly executed.

  In this way, transmission / reception is performed between the mobile phone 1 and the reader / writer 72 by reducing the mobile phone transmission power based on the instruction of the reader / writer 72 in accordance with the start and end of the non-contact IC card communication. The influence of mobile phone transmission signals on electromagnetic waves (carrier waves) can be reduced, and the quality of contactless IC card communication can be improved. In addition, since the mobile phone transmission power is reduced by an instruction from the reader / writer 72, it is possible to set whether to reduce the mobile phone transmission power for each reader / writer, and to arbitrarily set the timing for reducing the mobile phone transmission power. Can be set to

  Next, details of the transmission power reduction processing in step S5 in FIG. 5 will be described with reference to the flowchart in FIG.

  In step S <b> 21, the communication processing control unit 123 determines whether communication with the base station 71 is in progress. The communication processing control unit 123 is communicating with the base station 71 when performing communication with the base station 71 during a call, data communication, or other communication (for example, location registration). And the process proceeds to step S22.

  In step S22, the transmission power control unit 122 determines whether or not the mobile phone transmission power is a lower limit value. If it is determined that the mobile phone transmission power is not the lower limit value, the process proceeds to step S23.

  In step S23, the transmission power control unit 122 lowers the mobile phone transmission power by a predetermined value by lowering the amplification factor of the transmission amplifier 13 by a predetermined value, and the transmission power reduction process ends.

  If it is determined in step S21 that communication is not being performed with the base station 71, the process proceeds to step S24.

  In step S22, when it is determined that the mobile phone transmission power is the lower limit value, the process of step S23 is skipped, and the transmission power reduction process ends. That is, the value of the mobile phone transmission power is maintained at the lower limit value.

  In step S24, similar to the process in step S7 of FIG. 5, the transmission power is returned to the normal mobile phone transmission power, and the transmission power reduction process ends.

  Note that the mobile phone transmission power may be reduced without performing the determination process in step S21 regardless of whether or not the communication with the base station 71 is in progress. In step S21, the condition for determining that communication with the base station 71 is in progress may be limited to only when predetermined communication is being performed such as during a call or during data communication. Further, in step S21, instead of determining whether or not communication with the base station 71 is in progress, it is determined whether or not a mobile phone transmission signal is being transmitted to the base station 71, and the mobile phone transmission signal is transmitted. The mobile phone transmission power may be lowered only in the middle. In step S23, instead of lowering the transmission power by a predetermined value, the transmission power may be lowered to the lower limit at once, or transmission of the transmission signal may be stopped.

  FIG. 7 is a flowchart showing another example of the transmission power control process executed by the mobile phone 1. This process is started when the power of the mobile phone 1 is turned on and is finished when the power is turned off.

  In step S41, the CPU 103 determines whether reception of a command has been started. Specifically, the CPU 103 performs the reader / writer 72 based on the change in the value of the reader / writer transmission signal received from the reader / writer 72 via the antenna 24, the analog front end unit 101, the SPU 102, and the bus 109. It is determined whether or not the reception of the command transmitted from is started.

  The determination process in step S41 is repeatedly executed until it is determined that reception of some command is started regardless of the type of command. If transmission of some command is started from the reader / writer 72 and it is determined in step S41 that reception of the command is started, the process proceeds to step S42.

  In step S42, a transmission power reduction start instruction signal is supplied from the CPU 103 to the CPU 21 in the same manner as in step S2 of FIG.

  In step S43, the CPU 103 determines whether or not the transmission of the response signal for the command received from the reader / writer 72 in step S41 has been completed. In step S41, the CPU 103 receives the command from the reader / writer 72, generates response data for the received command, and supplies the generated response data to the SPU 102 via the bus 109. The SPU 102 performs predetermined processing on the response data, and supplies the processed response data to the analog front end unit 101. The analog front end unit 101 transmits a response signal based on the response data to the reader / writer 72 via the antenna 24. At this time, for example, the SPU 102 supplies a signal indicating that supply of response data to the analog front end unit 101 has ended (hereinafter referred to as a response data supply end signal) to the CPU 103 via the bus 109, and the CPU 103 When the response data supply end signal is acquired, it is determined that the transmission of the response signal has ended.

  If it is determined in step S43 that the transmission of the response signal has not ended, that is, if the response data supply end signal has not yet been supplied from the SPU 102, the process proceeds to step S44, and in FIG. The transmission power reduction process described above with reference to is executed. Thereafter, the process returns to step S43, and the processes in steps S43 and S44 are repeatedly executed until it is determined in step S43 that the transmission of the response signal has been completed, and the mobile phone transmission power is gradually reduced by a predetermined value. It is done.

  If it is determined in step S43 that the transmission of the response signal has ended, that is, if a response data supply end signal is supplied from the SPU 102 to the CPU 103, the process proceeds to step S45.

  In step S45, a transmission power reduction end instruction signal is supplied from the CPU 103 to the CPU 21 in the same manner as in step S6 in FIG. 5, and in step S46, the normal mobile phone transmission power is transmitted in the same manner as in step S7 in FIG. After returning to step S41, the process returns to step S41, and the above-described process is repeatedly executed.

  In this way, by reducing the mobile phone transmission power only while the command or response signal is being transmitted / received between the reader / writer 72 and the mobile phone 1, the period for reducing the mobile phone transmission power is reduced. By shortening the length, it is possible to improve the quality of contactless IC card communication while suppressing deterioration of the quality of mobile phone communication. Further, the mobile phone transmission power can be controlled without changing the reader / writer 72.

  FIG. 8 is a flowchart showing still another example of the transmission power control process executed by the mobile phone 1. This process is started when the power of the mobile phone 1 is turned on and is finished when the power is turned off.

  In step S <b> 61, the CPU 103 determines whether a carrier wave is received from the reader / writer 72. As described above, the analog front end unit 101 supplies a non-contact IC card communication detection signal to the CPU 103 while detecting reception of an electromagnetic wave (carrier wave) radiated from the reader / writer 72. The CPU 103 determines whether a carrier wave is received from the reader / writer 72 based on the non-contact IC card communication detection signal.

  When the cellular phone 1 is brought close to the reader / writer 72, an electromagnetic wave transmitted from the reader / writer 72 is received by the antenna 24, and a non-contact IC card communication detection signal is supplied from the analog front end unit 101 to the CPU 103, in step S61 Then, it is determined that the carrier wave is received from the reader / writer 72, and the process proceeds to step S62.

  In step S62, a transmission power reduction start instruction signal is supplied from the CPU 103 to the CPU 21 as in the process of step S2 of FIG.

  In step S63, it is determined whether a carrier wave is received from the reader / writer 72 as in the process of step S61. If it is determined that the carrier wave is received from the reader / writer 72, the process proceeds to step S64, and the transmission power reduction process described above with reference to FIG. 6 is executed in step S64. Thereafter, the process returns to step S63, and the processes in steps S63 and S64 are repeatedly executed until it is determined in step S63 that the carrier wave is not received from the reader / writer 72, and the mobile phone transmission power is incremented by a predetermined value. Lowered.

  When the mobile phone 1 is separated from the reader / writer 72, the electromagnetic wave transmitted from the reader / writer 72 is not received by the antenna 24, and the supply of the non-contact IC card communication detection signal from the analog front end unit 101 to the CPU 103 is stopped. In step S63, it is determined that no carrier wave is received from the reader / writer 72, and the process proceeds to step S65.

  In step S65, a transmission power reduction end instruction signal is supplied from CPU 103 to CPU 21 in the same manner as in step S6 in FIG. 5. In step S66, normal mobile phone transmission power is obtained in the same manner as in step S7 in FIG. Then, the process returns to step S61, and the above-described process is repeatedly executed.

  In this way, the mobile phone transmission power can be reduced when a carrier wave is received from the reader / writer 72 before command / data transmission / reception is performed between the reader / writer 72 and the mobile phone 1. Can improve the quality of non-contact IC card communication. Further, the mobile phone transmission power can be controlled without changing the reader / writer 72.

  FIG. 9 is a flowchart showing still another example of the transmission power control process executed by the mobile phone 1. This process is started when the power of the mobile phone 1 is turned on and is finished when the power is turned off.

  For example, as described above, when the mobile phone 1 is close to the reader / writer 72, the mobile phone 1 receives a polling signal periodically transmitted from the reader / writer 72 and transmits a response signal to the polling signal to the reader / writer 72. . Thereafter, a service code of a service provided by the reader / writer 72 is transmitted from the reader / writer 72 to the mobile phone 1 in the processing of the authentication procedure performed between the reader / writer 72 and the mobile phone 1. The CPU 103 receives a service code from the reader / writer 72 via the antenna 24, the analog front end unit 101, the SPU 102, and the bus 109.

  In step S <b> 81, the CPU 103 determines whether a service code has been received from the reader / writer 72. The determination process in step S81 is repeatedly executed at predetermined intervals (for example, 10 milliseconds) until it is determined that the service code has been received. If the service code is transmitted from the reader / writer 72 and it is determined in step S81 that the service code has been received, the process proceeds to step S82.

  In step S82, the CPU 103 determines whether or not the service code received in step S81 is registered in the nonvolatile memory 107. If it is determined that the service code is registered, that is, if the mobile phone 1 can receive the service provided by the reader / writer 72, the process proceeds to step S83.

  In step S83, the CPU 103 determines that the service provided from the reader / writer 72 is the transmission power reduction target service based on the service code received in step S81 and the transmission power reduction target service information stored in the nonvolatile memory 107. It is determined whether or not there is. If it is determined that the service provided from the reader / writer 72 is a transmission power reduction target service, the process proceeds to step S84.

  The transmission power reduction target service information is registered in the ROM 22 or a non-volatile memory (not shown) accessible by the CPU 21, and information indicating the service code of the service provided by the reader / writer 72 is supplied from the CPU 103 to the CPU 21. The determination process in step S83 may be performed.

  In step S84, as in the process of step S4 in FIG. 5, it is determined whether or not the non-contact IC card communication has ended. If it is determined that the non-contact IC card communication has not ended, the process proceeds to step S85, and the transmission power reduction process described above with reference to FIG. 6 is executed. Thereafter, the process returns to step S84, and the processes of steps S84 and S85 are repeatedly executed at a predetermined interval (for example, 10 milliseconds) until it is determined in step S84 that the non-contact IC card communication has ended. The mobile phone transmission power is gradually reduced.

  If it is determined in step S84 that the non-contact IC card communication has been completed, the process proceeds to step S86.

  In step S86, a transmission power reduction end instruction signal is supplied from the CPU 103 to the CPU 21 in the same manner as the processing in step S6 in FIG. 5. In step S87, as in the processing in step S7 in FIG. Then, the process returns to step S81, and the above-described process is repeatedly executed.

  If it is determined in step S82 that the received service code is not registered, or if it is determined in step S83 that the service provided from the reader / writer 72 is not a transmission power reduction target service, the process proceeds to step S82. Returning to S81, the above-described processing is repeatedly executed.

  In this way, the mobile phone transmission output of the mobile phone 1 can be controlled according to the type of service provided by the reader / writer 72. Further, the mobile phone transmission power can be controlled without changing the reader / writer 72.

  For example, using a service that manages commuter pass information, such as when passing through a ticket gate provided with a reader / writer, contactless IC card communication fails, and the problem (for example, If the service is burdened on the user or the ticket gate is congested), the quality of contactless IC card communication can be improved while using the service by setting the service as a target for reducing transmission power. Can be improved.

  In addition, using a service that manages electronic money information, contactless IC card communication may fail and communication may be restarted from the beginning, as in the case of paying for goods with a register equipped with a reader / writer. If there is no problem, by not setting the service as a transmission power reduction target service, it is possible to prevent the communication quality of the mobile phone from being deteriorated while using the service.

  As described above, according to the communication with the wireless reader / writer for the non-contact IC card, it is instructed to reduce the transmission power of the signal transmitted in another communication function different from the non-contact IC card function, and the transmission power is reduced. When the transmission power is controlled so as to decrease, it is possible to communicate with an external reader / writer for a non-contact IC card. In addition, the communication quality with an external non-contact IC card reader / writer can be improved.

  In the above description, an example of a mobile phone having a non-contact IC card communication function and a communication function based on a mobile phone communication standard as a wireless communication function other than the non-contact IC card communication function is shown. Is a wireless LAN defined by IEEE (Institute of Electrical and Electronic Engineers) 802.11 (802.11a, 802.11b, 802.11g, etc.) as a non-contact IC card communication function and a wireless communication function other than the non-contact IC card communication function. (Local Area Network) standards, PHS (Personal Handyphone System Internet Access Forum Standard) PHS (Personal Handyphone System) communication standards, Bluetooth (trademark) standards and other wireless communication devices with wireless communication functions can do. The present invention can also be applied to a wireless communication device having three or more types of wireless communication functions including a contactless IC card communication function.

  The series of processes described above can be executed by hardware or can be executed by software.

  When a series of processing is executed by software, the control program is received from a network server connected to the base station 71 via the antenna 11 in addition to providing the control program in a state incorporated in the ROMs 22 and 106. Or a removable medium comprising a magnetic disk 51, an optical disk 52, a magneto-optical disk 53, or a semiconductor memory 54 in which a control program is recorded, the removable medium is mounted on the drive 41, and the control program is downloaded from the removable medium 41. It is also possible to read and install the acquired control program in a nonvolatile memory (not shown) or the nonvolatile memory 107 that can be accessed by the CPU 21.

  In the present specification, the step of describing the program stored in the program storage medium is not limited to the processing performed in chronological order according to the described order, but is not necessarily performed in chronological order. Or the process performed separately is also included.

It is a block diagram which shows one Embodiment of the mobile telephone to which this invention is applied. It is a figure which shows the apparatus which communicates with the mobile telephone of FIG. It is a block diagram which shows the detail of the example of a structure of the non-contact IC card part of FIG. FIG. 2 is a block diagram illustrating an example of a part of functions realized by the CPU of FIG. 1. 4 is a flowchart illustrating an example of transmission power control processing executed by the mobile phone of FIG. 1. It is a flowchart which shows the detail of the transmission power reduction process of FIG.5 S5. 6 is a flowchart showing another example of transmission power control processing executed by the mobile phone of FIG. 1. 6 is a flowchart showing still another example of transmission power control processing executed by the mobile phone of FIG. 1. 6 is a flowchart showing still another example of transmission power control processing executed by the mobile phone of FIG. 1.

Explanation of symbols

  1 Mobile phone, 11 Antenna, 12 Transmitter, 13 Transmitter amplifier, 14 Receiver, 15 DSP, 16 Audio processor, 21 CPU, 22 ROM, 23 RAM, 24 Antenna, 25 Non-contact IC card, 41 Drive, 51 Magnetic disk, 52 optical disk, 53 magneto-optical disk, 54 semiconductor memory, 71 base station, 72 reader / writer, 101 analog front end unit, 102 SPU, 103 CPU, 105 RAM, 106 ROM, 107 nonvolatile memory, 108 communication unit, 121 communication unit, 122 transmission power control unit, 123 communication processing control unit

Claims (10)

In a wireless communication device having a contactless IC card function and another wireless communication function different from the contactless IC card function,
In response to communication with the wireless reader / writer for the non-contact IC card, instruction means for instructing to reduce the transmission power of the signal transmitted in the other communication function,
And a transmission power control means for controlling the transmission power so as to reduce the transmission power according to an instruction from the instruction means. The wireless communication apparatus according to claim 1, wherein the instruction unit instructs to reduce transmission power of the transmission signal based on an instruction from the wireless reader / writer. Further comprising carrier wave detection means for detecting reception of a carrier wave transmitted from the wireless reader / writer,
The wireless communication apparatus according to claim 1, wherein the instruction unit instructs the transmission power to be lowered while reception of the carrier wave is detected by the carrier wave detection unit. The instructing unit instructs to reduce the transmission power after the reception of the command from the wireless reader / writer is started until the transmission of the response signal to the command to the wireless reader / writer is completed. The wireless communication apparatus according to claim 1. The wireless communication apparatus according to claim 1, wherein the instruction unit instructs to reduce the transmission power while communication of a predetermined service is performed with the wireless reader / writer. The transmission power control means, when instructed by the instruction means to reduce the transmission power, reduces the transmission power so as to reduce the transmission power when communication by the other wireless communication function is performed. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is controlled. The wireless communication apparatus according to claim 1, wherein the other wireless communication function is a communication function based on a communication standard of a cellular phone or a PHS (Personal Handyphone System). In a communication control method of a wireless communication device having a non-contact IC card function and another wireless communication function different from the non-contact IC card function,
Instructing to reduce the transmission power of the signal transmitted in the other communication function according to the communication with the wireless reader / writer for the non-contact IC card,
And a transmission power control step of controlling the transmission power so as to reduce the transmission power according to an instruction by the processing of the instruction step. A program for a computer of a wireless communication device having a non-contact IC card function and another wireless communication function different from the non-contact IC card function,
Instructing to reduce the transmission power of the signal transmitted in the other communication function according to the communication with the wireless reader / writer for the non-contact IC card,
And a transmission power control step of controlling the transmission power so as to lower the transmission power according to an instruction by the processing of the instruction step. A recording medium on which a computer-readable program is recorded. In a program for performing communication control processing on a computer of a wireless communication device having a wireless communication device having a wireless communication function different from the contactless IC card function and the contactless IC card function,
Instructing to reduce the transmission power of the signal transmitted in the other communication function according to the communication with the wireless reader / writer for the non-contact IC card,
A transmission power control step of controlling the transmission power so as to lower the transmission power according to an instruction by the processing of the instruction step.

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