JP4129467B2 - Mobile communication terminal and radio wave interference avoiding method - Google Patents

Description

  The present invention relates to a mobile communication terminal and a radio wave interference avoiding method.

In a wireless communication device such as a cellular phone, interference between radio waves transmitted and received and radio waves emitted from internal devices can cause communication quality degradation. As a technique for avoiding such radio wave interference, for example, there is a clock control method described in Patent Document 1 below. In this clock control method, the frequency band of the radio wave used by the wireless module is determined, and the internal CPU is operated at a clock frequency that does not interfere with the frequency band.
JP 2002-290261 A

  However, in the mobile communication system adopted in mobile phones and the like, the channel frequency used between the mobile phone and the base station is not constant. Therefore, even with the clock control method in the above prior art, the interference frequency is accurately determined. It is difficult to predict and control.

  Furthermore, due to recent developments in short-range wireless technology, a mobile communication terminal such as a mobile phone may be equipped with both a communication module for mobile communication and a communication module for short-range wireless communication. Has been done. In this case, when the communication between the short-range wireless communication module and the external IC card, personal computer, etc. and the communication using the mobile communication module are performed at the same time, radio wave interference to the mobile communication side is caused. It tends to occur. That is, when the distance between a plurality of wireless modules is short, spurious radiation from one wireless module adversely affects communication in the other wireless module.

  Accordingly, an object of the present invention is to provide a mobile communication terminal and a radio wave interference avoiding method capable of sufficiently preventing deterioration of communication quality due to interference when simultaneous communication is performed using a plurality of wireless systems. .

In order to solve the above-described problem, a mobile communication terminal of the present invention includes an antenna, an IC chip, and a memory that transmit radio waves having the same frequency as a carrier wave in response to reception of the carrier wave by a short-range wireless method. mobile short distance wireless communication means, for transmitting and receiving radio waves by the mobile communication system, and outputs a communication start notification and a communication completion notice in response to the occurrence of the communication by the radio wave to output a communication start notification and a communication completion notice in response to and body communication means, after receiving the communication start notification from both the short-range wireless communication means and the mobile communication means, the timing from one of the short-range wireless communication means and the mobile communication means to receive the communication end notification detection by, timing of detecting the timing of transmission and reception of radio waves by short-range wireless communication means, an overlap of the timing of transmission and reception of radio waves by the mobile communication means Detection means, of the frequency of the radio waves received by the mobile communication means, and the frequency information storage means for storing the interference frequency information indicating a frequency to produce a radio interference that is received by the short-range wireless communication means, the mobile communication and a frequency control means for controlling the reception frequency of the device, the frequency control means is detected duplicates by the timing detection unit, and the frequency of the radio waves received by the mobile communications unit, is stored in the frequency information storage unit When the received frequency matches the received frequency represented by the interference frequency information, the received frequency of the mobile communication means is shifted by a predetermined frequency within the accuracy range of the received frequency .

The radio wave interference avoiding method of the present invention includes an antenna, an IC chip, and a memory in which the short-range wireless communication means transmits a radio wave having the same frequency as that of the carrier in response to reception of the carrier by the short-range wireless method. A short-range wireless communication step for outputting a communication start notification and a communication end notification in response to the detection of the communication, and the mobile communication means transmit and receive radio waves by the mobile communication method , and a communication start notification in response to the occurrence of communication by the radio waves And the mobile communication step for outputting the communication end notification and the timing detection means after receiving the communication start notification from both the short-range wireless communication means and the mobile communication means, the short-range wireless communication means and the mobile communication means by detecting the timing to receive a communication completion notice from either the timing of the radio wave transmission and reception in a short-range wireless communication step, the mobile communication Interference timing detection step of detecting a duplication of the timing of transmission and reception of radio waves in the step, the frequency information storage means, of the frequency of the radio wave received at the mobile communication step, the radio wave transmitted and received in the short-range wireless communication step The frequency information storing step for storing interference frequency information representing the frequency causing the occurrence of the interference and the frequency control means detect the duplication in the timing detecting step and the frequency of the radio wave received in the mobile communication step is stored in the frequency information storing means. A frequency control step of shifting the reception frequency of the mobile communication means by a predetermined frequency within a range of accuracy of the reception frequency when the reception frequency matches the reception frequency represented by the stored interference frequency information. Features.

  According to such a mobile communication terminal and radio wave interference avoiding method, a reception frequency that interferes with radio waves transmitted and received by the short-range wireless method among the frequencies of radio waves received by the mobile communication method is stored in advance. When the transmission / reception timing of radio waves using the distance wireless method and the transmission / reception timing of radio waves using the mobile communication method overlap, and the frequency of the radio wave received using the mobile communication method matches the pre-stored reception frequency The transmission frequency by the short-range wireless system or the reception frequency by the mobile communication system is shifted by a predetermined frequency. Thereby, when it is predicted that interference will occur, it is possible to immediately avoid data loss and bit errors in mobile communication. In addition, since the frequency is shifted only when communication between different communication schemes collides, efficient use of radio wave resources is realized.

The frequency information storage means stores harmonic frequencies of radio waves transmitted and received by the short-range wireless communication means as interference frequency information, the frequency control means detects duplication by the timing detection means, and the mobile communication means When the frequency of the radio wave received by the radio frequency coincides with the harmonic frequency stored in the frequency information storage means, it is preferable to shift the reception frequency of the mobile communication means by a predetermined frequency. The predetermined frequency is also preferably within 0.05 × 10 ⁻⁶ times the reception frequency of the mobile communication means .

  In this case, radio wave interference due to harmonics contained in radio waves transmitted and received by the first wireless communication means is prevented, and data loss and bit error occurrence in mobile communication can be more effectively avoided.

  ADVANTAGE OF THE INVENTION According to this invention, when performing simultaneous communication by a some radio | wireless system, degradation of the communication quality accompanying interference can fully be prevented.

  Hereinafter, preferred embodiments of a mobile communication terminal according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is a schematic configuration diagram showing a first embodiment of a mobile communication terminal according to the present invention. A mobile communication terminal 1 shown in the figure is a communication terminal capable of data communication by a mobile communication system and a short-range wireless system. Examples of such communication terminals include devices capable of information communication via a mobile communication network such as a mobile phone, a PHS (Personal Handyphone System), and a PDA (Personal Digital Assistance). The mobile communication terminal 1 transmits and receives radio waves to and from the base station 3 using a mobile communication system, and also uses a non-contact system between the mobile communication terminal 1 and a non-contact IC (Integrated Circuit) card 2 located at a short distance. It is configured to be able to send and receive radio waves.

  Here, the mobile communication system is a communication system for transmitting and receiving digital data intended for mobile communication terminals such as PDC (Personal Digital Cellular Telecommunication System) system and IMT-2000 (International Mobile Telecommunications-2000) system. is there. In this scheme, radio waves transmitted and received between the mobile communication terminal and the base station are transmitted on a plurality of radio channels in various frequency bands.

  The non-contact method is a communication method for transmitting and receiving data in a non-contact manner between a non-contact IC card and an external reader / writer (R / W) device built in an automatic ticket gate, vending machine or the like. This is a method adopted by Felica (registered trademark), Edy (registered trademark), and the like.

  As shown in FIG. 1, the mobile communication terminal 1 is a non-contact ICR / W (Reader / Writer) unit 11 which is a first wireless communication means and a second wireless communication means as functional components. The mobile communication unit 12 includes a timing detection unit (timing detection unit) 13, a frequency control unit (frequency control unit) 14, and a frequency information storage unit (frequency storage unit) 15. Hereinafter, each component will be described in detail.

  The non-contact ICR / W unit 11 is a part that transmits and receives radio waves to and from the non-contact IC card 2 by a non-contact method. At that time, if the frequency is not shifted by the frequency control unit 14 described later, the non-contact ICR / W unit 11 sets the transmission frequency to 13.56 MHz and transmits a carrier wave (radio wave) to the non-contact IC card 2. Further, the non-contact ICR / W unit 11 receives a radio wave transmitted from the non-contact IC card 2 induced by the carrier wave. In this case, the reception frequency is set to 13.56 MHz which is a frequency equal to the transmission frequency of the carrier wave. Through the above-described bidirectional communication, the non-contact ICR / W unit 11 performs detection of the non-contact IC card 2, mutual authentication with the non-contact IC card 2, and data reading / writing with respect to the non-contact IC card 2.

  Further, the non-contact ICR / W unit 11 outputs a communication start notification to the timing detection unit 13 when the non-contact IC card 2 is detected in the communicable area. Similarly, the non-contact ICR / W unit 11 also outputs a communication end notification to the timing detection unit 13 when communication with the non-contact IC card 2 is ended.

  The mobile communication unit 12 is a part that transmits and receives radio waves to and from the base station 3 using a mobile communication method. More specifically, the mobile communication unit 12 transmits radio waves to the base station 3 in response to a communication start request from an input unit such as a button (not shown). In this case, a radio channel designated in advance by the base station 3 using a control signal or the like is used. In addition, the mobile communication unit 12 receives radio waves transmitted from the base station 3 at the same time. The frequency of the received radio wave is variable according to the radio channel designated in advance by the base station 3, and the mobile communication unit 12 sets the reception frequency so that the reception sensitivity matches the frequency of the received radio wave.

  In addition, when the mobile communication unit 12 receives a communication start request from the input unit, the mobile communication unit 12 outputs a communication start notification to the timing detection unit 13. Similarly, when the communication with the base station 3 is ended, the mobile communication unit 12 also outputs a communication end notification to the timing detection unit 13. Further, the mobile communication unit 12 outputs a frequency code of a radio channel used with the base station 3 to the frequency control unit 14. This frequency code is for specifying the frequency of the radio wave transmitted from the base station 3 to the mobile communication unit 12.

  The timing detection unit 13 is a part that detects an overlap between the timing of transmission / reception of radio waves by the non-contact ICR / W unit 11 and the timing of transmission / reception of radio waves by the mobile communication unit 12. Specifically, the timing detection unit 13 outputs a detection start notification to the frequency control unit 14 immediately after receiving the communication start notification from both the non-contact ICR / W unit 11 and the mobile communication unit 12. Thereafter, when receiving a communication end notification from the non-contact ICR / W unit 11 or the mobile communication unit 12, the timing detection unit 13 outputs a detection end notification to the frequency control unit 14. Between the time when the detection start notification is output and the time when the detection end notification is output, transmission / reception of radio waves by the non-contact ICR / W unit 11 and transmission / reception of radio waves by the mobile communication unit 12 overlap. It is substantially coincident with the time zone.

  The frequency control unit 14 is a part that controls the frequency of the carrier wave that the non-contact ICR / W unit 11 transmits to the non-contact IC card 2 and the reception frequency in the mobile communication unit 12. In other words, the frequency control unit 14 detects the duplication of radio wave transmission / reception timing by the timing detection unit 13 and the frequency of the radio wave received by the mobile communication unit 12 matches the reception frequency stored in advance. First, one of the carrier frequency and the reception frequency of the mobile communication unit 12 is controlled to be shifted by a predetermined frequency. Hereinafter, a case where the frequency of the carrier wave is controlled will be described.

  More specifically, the frequency control unit 14 outputs the interference frequency information stored in the frequency information storage unit 15 after the detection start notification is output from the timing detection unit 13 until the detection end notification is output. The frequency is controlled by referring to it.

  Here, FIG. 2 shows a data structure of the interference frequency information stored in the frequency information storage unit 15. As shown in the figure, the reception frequency indicating the frequency of the radio wave received by the mobile communication unit 12, the radio wave received by the mobile communication unit 12, and the radio wave transmitted and received by the non-contact ICR / W unit 11 An interference flag indicating the presence or absence of interference is stored in association with the frequency code of the radio channel used with the base station 3. For example, in the radio channel of the frequency code “Analog 1536”, the reception frequency is “881.4 MHz”, which is a 13.56 MHz higher harmonic wave (65th harmonic wave) that is likely to cause interference. 1 ”(= interference exists) is set.

  Therefore, the frequency control unit 14 refers to the frequency information storage unit 15 based on the frequency code output from the mobile communication unit 12, and reads the interference frequency information with the matching frequency code. When the interference flag in the read interference frequency information is “1”, the frequency control unit 14 shifts the frequency of the carrier wave transmitted from the non-contact ICR / W unit 11 from 13.56 MHz to +0.1 MHz. To “13.66 MHz”. According to the example of FIG. 2, when the frequency code output from the mobile communication unit 12 is “Analog 1536”, the interference flag in the interference frequency information is “1”, so the frequency of the carrier wave is “13”. .66 MHz ". On the other hand, when the frequency code output from the mobile communication unit 12 is “analog 1532”, the interference flag is “0” (= no interference) in the interference frequency information, so the frequency of the carrier wave is “13.56 MHz. Is maintained.

  Next, the operation of the mobile communication terminal 1 will be described with reference to FIG. 3 and a radio wave interference avoiding method in the mobile communication terminal 1 will be described in detail. FIG. 3 is a flowchart showing the operation of the mobile communication terminal 1.

  First, the non-contact ICR / W unit 11 detects that the non-contact IC card 2 is within a communicable range, and simultaneously notifies the timing detection unit 13 of communication start (step S101). Next, when a communication start request is received by the mobile communication unit 12, a communication start notification is output to the timing detection unit (step S102). In the processing in steps S101 to S102, the non-contact IC card 2 may be detected after the mobile communication unit 12 receives a communication start request. As a result, the timing detection unit 13 detects an overlap between the radio wave transmission / reception timing by the non-contact ICR / W unit 11 and the radio wave transmission / reception timing by the mobile communication unit 12 (step S103).

  When duplication of radio wave transmission / reception timing is detected by the timing detection unit 13, the frequency control unit 14 is stored in the frequency information storage unit 15 based on the frequency code of the communication channel through which the mobile communication unit 12 receives radio waves. The interference frequency information is read (step S104). Then, based on the interference flag included in the read interference frequency information, the frequency control unit 14 determines the frequency of the radio wave received and transmitted by the non-contact ICR / W unit 11 based on the frequency of the radio wave received by the mobile communication unit 12. It is determined whether or not the frequency is subject to interference (step S105).

  As a result of the above determination, when the interference flag corresponding to the frequency of the radio wave received by the mobile communication unit 12 is “1” (step S105; YES), the frequency control unit 14 determines that the non-contact ICR / W unit 11 Control is performed to shift the frequency of the radio wave transmitted to the non-contact IC card 2 by +0.1 MHz (step S106). By this control, radio waves with a frequency of 13.66 MHz are transmitted and received between the non-contact ICR / W unit 11 and the non-contact IC card 2 (step S107). At the same time, transmission / reception of radio waves is started between the mobile communication unit 12 and the base station 3 (step S108).

  On the other hand, when the interference flag corresponding to the frequency of the radio wave received by the mobile communication unit 12 is “0” (step S105; NO), the frequency of the radio wave transmitted to the non-contact IC card 2 Are not shifted, and a conventional radio wave with a frequency of 13.56 MHz is transmitted and received between the non-contact ICR / W unit 11 and the non-contact IC card 2 (step S109). At the same time, transmission / reception of radio waves is started between the mobile communication unit 12 and the base station 3 (step S110).

  According to the mobile communication terminal 1 described above, a frequency that interferes with a radio wave transmitted / received by the non-contact IC card method among the frequencies of radio waves received by the mobile communication method is stored in advance. If the transmission / reception timing of the radio wave and the transmission / reception timing of the mobile communication system overlap, and the frequency of the radio wave received by the mobile communication system matches the pre-stored frequency, The transmission frequency by the wireless system or the reception frequency by the mobile communication system is shifted by a predetermined amount.

  The radio wave induced in the non-contact IC card 2 by the carrier wave transmitted from the non-contact ICR / W unit 11 tends to include a harmonic component of the frequency of the carrier wave due to a prior radiation. Therefore, for example, if these harmonic frequencies are stored in advance in the frequency information storage unit 15 as reception frequencies, interference can be prevented by shifting the harmonic frequencies or the reception frequency of the mobile communication unit 12. Data loss and bit error occurrence in mobile communication can be avoided more effectively.

  In addition, since frequency shift is performed only when communication using the non-contact IC card method and communication using the mobile communication method collide, efficient use of radio resources is achieved without occupying unnecessary frequency bands. Is done.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. FIG. 4 is a schematic configuration diagram showing a second embodiment of the mobile communication terminal according to the present invention. The main differences of the mobile communication terminal 5 in this embodiment from the first embodiment are that a non-contact IC card 51 is built in place of the non-contact ICR / W unit 11 and the mobile communication system. Only the reception frequency of the radio wave received at can be shifted. Hereinafter, differences between the components of the mobile communication terminal 5 according to the present embodiment and the first embodiment will be described in detail.

  The non-contact IC card 51 has an antenna, an IC chip, and a memory inside, and is configured to be able to transmit and receive radio waves with an external R / W (Reader / Writer) 4 by a non-contact method. Yes. At that time, the non-contact IC card 51 receives a carrier wave having a frequency of 13.56 MHz from the external R / W 4 and transmits a radio wave having the same frequency induced by this carrier wave to the external R / W 4. By the transmission / reception of radio waves as described above, detection of the non-contact IC card 51 by the external R / W 4, mutual authentication between the external R / W 4 and the non-contact IC card 51, and from the external R / W 4 to the memory of the non-contact IC card 51 Can be accessed (read / write).

  Further, the non-contact IC card 51 outputs a communication start notification to the timing detection unit 13 when detecting a carrier wave from the external R / W 4. Similarly, the non-contact IC card 51 also outputs a communication end notification to the timing detection unit 13 when the communication with the external R / W 4 is ended.

  The frequency control unit 54 is a part that controls the reception frequency of radio waves received by the mobile communication unit 12 from the base station 3. In other words, the frequency control unit 54 detects the duplication of radio wave transmission / reception timing by the timing detection unit 13 and the frequency of the radio wave received by the mobile communication unit 12 matches the reception frequency stored in advance. In this case, the reception frequency is controlled to be shifted by a predetermined frequency.

  More specifically, the frequency control unit 54 outputs the interference frequency information stored in the frequency information storage unit 15 after the detection start notification is output from the timing detection unit 13 until the detection end notification is output. The reception frequency is controlled by referring to it.

That is, the frequency control unit 54 refers to the frequency information storage unit 15 based on the frequency code output from the mobile communication unit 12 and reads the interference frequency information that matches the frequency code. Then, when the interference flag in the read interference frequency information is “1”, the frequency control unit 54 performs control so that the reception sensitivity of the mobile communication unit 12 is adjusted to the frequency obtained by shifting the reception frequency by +40 Hz. Generally, since the frequency accuracy of the radio wave transmitted from the base station is ± 0.05 × 10 ⁻⁶ , the shift amount of the reception frequency is 40 Hz. According to the example of FIG. 2, when the frequency code output from the mobile communication unit 12 is “analog 1536” and the reception frequency is “881.4 MHz”, the interference flag in the interference frequency information is “1”. Therefore, the reception frequency of the mobile communication unit 12 is controlled to be “881.4400040 MHz”. On the other hand, when the frequency code output from the mobile communication unit 12 is “analog 1532” and the reception frequency “881.3 MHz”, the interference flag is “0” (= no interference) in the interference frequency information. The reception frequency of the mobile communication unit 12 is maintained at “881.3 MHz”.

  Next, the operation of the mobile communication terminal 5 will be described with reference to FIG. 5, and a radio wave interference avoiding method in the mobile communication terminal 5 will be described in detail. FIG. 5 is a flowchart showing the operation of the mobile communication terminal 5. In addition, since each process of step S202-S205 in FIG. 5 is the same as each process (refer FIG. 3) of step S102-S105 explained in full detail in 1st Embodiment, it differs from 1st Embodiment, respectively. The processes of S201 and S206 to S208 will be described.

  First, the carrier wave transmitted from the external R / W is detected by the non-contact IC card 51 (step S201). Thereafter, in steps S202 to S205, an overlap between the communication timing in the non-contact IC card 51 and the communication timing in the mobile communication unit 12 is detected, and the frequency of the radio wave received by the mobile communication unit 12 is determined as the non-contact IC card 51. It is determined whether or not the frequency causes interference by radio waves transmitted and received.

  When the interference flag corresponding to the frequency of the radio wave received by the mobile communication unit 12 is “1” as a result of the determination (step S205; YES), the frequency control unit 54 receives the reception frequency of the mobile communication unit 12. Is controlled to be shifted by +40 Hz (step S206). Thereafter, transmission / reception of radio waves between the mobile communication unit 12 and the base station 3 is started, and communication in the non-contact IC card 51 is continued (step S207).

  On the other hand, when the interference flag corresponding to the frequency of the radio wave received by the mobile communication unit 12 is “0”, the reception frequency of the mobile communication unit 12 is not shifted. Then, radio wave transmission / reception is started between the mobile communication unit 12 and the base station 3, and communication in the non-contact IC card 51 is continued (step S208).

  Also in the mobile communication terminal 5 described above, the frequency that interferes with the radio wave transmitted / received by the non-contact IC card method among the frequencies of the radio waves received by the mobile communication method is stored in advance, and the non-contact IC card method is used. If the transmission / reception timing of the radio wave and the transmission / reception timing of the radio wave by the mobile communication method overlap, and the frequency of the radio wave received by the mobile communication method matches the frequency stored in advance, the mobile communication The reception frequency according to the method is shifted by a predetermined frequency.

  The radio wave transmitted from the external R / W unit 4 tends to include harmonic components of the frequency of the carrier due to a prior radiation. Therefore, for example, if these harmonic frequencies are stored in advance in the frequency information storage unit 15 as reception frequencies, radio wave interference can be prevented by shifting the reception frequency of the mobile communication unit 12. Data loss and bit errors can be effectively avoided.

  In addition, since frequency shift is performed only when communication using the non-contact IC card method and communication using the mobile communication method collide, efficient use of radio resources is achieved without occupying unnecessary frequency bands. Is done.

  The present invention is not limited to the above-described embodiments. For example, the mobile communication terminals 1 and 5 may employ other methods such as Bluetooth (registered trademark), a wireless LAN communication method, and an infrared communication method as a short-range wireless method.

  Further, in the mobile communication terminals 1 and 5, the frequency control is performed at the timing when the mobile communication unit 12 receives the communication start request, but the frequency is transmitted at the timing when the connection request from another mobile communication terminal or the like is received. Control may be performed.

  In the mobile communication terminal 1, the transmission frequency by the non-contact method is shifted. However, the mobile communication terminal 1 may be operated so that the reception frequency by the mobile communication method is shifted in the same manner as the mobile communication terminal 5. . In this case, instead of shifting the frequency of the carrier wave transmitted from the non-contact ICR / W unit 11, or in addition to shifting the frequency of the carrier wave, the reception frequency of the mobile communication unit 12 can be shifted. Flexible communication control according to the situation becomes possible.

It is a schematic block diagram which shows 1st Embodiment of the mobile communication terminal by this invention. It is a figure which shows the data structure of the interference frequency information stored in the frequency information storage part of FIG. It is a flowchart which shows operation | movement of the mobile communication terminal of FIG. It is a schematic block diagram which shows 2nd Embodiment of the mobile communication terminal by this invention. 5 is a flowchart showing the operation of the mobile communication terminal of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,5 ... Mobile communication terminal, 2 ... Non-contact IC card, 3 ... Base station, 4 ... External R / W, 11 ... Non-contact ICR / W part, 12 ... Mobile communication part, 13 ... Timing detection part, 14 , 54 ... frequency control unit, 15 ... frequency information storage unit, 51 ... non-contact IC card.

Claims (4)

A short-range wireless system has an antenna, an IC chip, and a memory that transmit radio waves of the same frequency as the carrier wave in response to reception of the carrier wave , and outputs a communication start notification and a communication end notification in response to detection of the carrier wave. Distance wireless communication means ;
A mobile communication means for transmitting and receiving radio waves, and outputs a communication start notification and a communication completion notice in response to the occurrence of communication by the radio wave by the mobile communication system,
Timing from receiving the communication start notification from both the short-range wireless communication means and the mobile communication means until receiving the communication end notification from either the short-range wireless communication means or the mobile communication means By detecting, timing detection means for detecting an overlap between the timing of radio wave transmission / reception by the short-range wireless communication means and the timing of radio wave transmission / reception by the mobile communication means ,
Frequency information storage means for storing interference frequency information representing a frequency that causes interference with radio waves transmitted and received by the short-range wireless communication means among frequencies of radio waves received by the mobile communication means ;
Frequency control means for controlling the reception frequency of the mobile communication means ,
The frequency control means is a reception frequency in which the duplication is detected by the timing detection means and the frequency of the radio wave received by the mobile communication means is represented by interference frequency information stored in the frequency information storage means The received frequency of the mobile communication means is shifted by a predetermined frequency within the accuracy range of the received frequency ,
A mobile communication terminal characterized by the above. The frequency information storage means stores, as interference frequency information, harmonic frequencies of radio waves transmitted and received by the short-range wireless communication means ,
The frequency control means, when the duplication is detected by the timing detection means, and the frequency of the radio wave received by the mobile communication means coincides with the harmonic frequency stored in the frequency information storage means In addition, the reception frequency of the mobile communication means is shifted by a predetermined frequency,
The mobile communication terminal according to claim 1. The predetermined frequency is 0.05 × 10 4 of the reception frequency of the mobile communication means. ^-6 Is within double,
The mobile communication terminal according to claim 1, wherein the mobile communication terminal is a mobile communication terminal. The short-range wireless communication means has an antenna, an IC chip, and a memory for transmitting a radio wave having the same frequency as the carrier according to reception of the carrier by a short-range wireless method , and a communication start notification according to detection of the carrier and A short-range wireless communication step for outputting a communication end notification ;
Mobile communication means transmits and receives radio waves by the mobile communication system, a mobile communication step of outputting a communication start notification and a communication completion notice in response to the occurrence of the communication by electric waves,
The timing detection means receives the communication start notification from both the short-range wireless communication means and the mobile communication means, and then sends the communication end notification from either the short-range wireless communication means or the mobile communication means. Detecting a timing until receiving, a timing detecting step of detecting an overlap between a radio wave transmission / reception timing in the short-range wireless communication step and a radio wave transmission / reception timing in the mobile communication step;
A frequency information storage means for storing interference frequency information representing a frequency causing interference with the radio wave transmitted and received in the short-range wireless communication step among the frequencies of the radio wave received in the mobile communication step ; ,
The frequency control means detects the duplication in the timing detection step, and the frequency of the radio wave received in the mobile communication step is a reception frequency represented by interference frequency information stored in the frequency information storage means. If they match, the frequency control step of shifting the reception frequency of the mobile communication means by a predetermined frequency within the accuracy range of the reception frequency ;
A method for avoiding radio wave interference, comprising:

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