JP2016213621A - Radio communication device, radio communication program, and radio communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately control an impact on the reception sensitivity of other radio communication units other than a radio communication unit that performs multi-carrier transmission.SOLUTION: A radio communication device obtains and stores information on an impact of intermodulation distortion due to combination of frequencies at a plurality of radio transmission units included in a first radio communication unit on the reception sensitivity of a second radio communication unit, and stores gradual priority of the reception sensitivity of the second radio communication unit to the quality of multicarrier transmission performed by the first radio communication unit, and information on the transmission level of the radio transmission unit performing multicarrier transmission determined correspondingly to the priority. When the radio communication device determines that there is an impact on the reception sensitivity of the second radio communication unit, it controls the transmission level of the radio transmission unit performing multicarrier transmission to the transmission level corresponding to the priority of the reception sensitivity of the second radio communication unit selected prior to the execution of multicarrier transmission.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless communication device, a wireless communication program, and a wireless communication method.

  Recently, mobile stations capable of multi-carrier transmission that transmit a plurality of carriers, such as a high-performance mobile phone (hereinafter simply referred to as a mobile phone) called a smart phone or the like, have appeared. Such a mobile station may include, for example, a wireless communication unit for GPS (Global Positioning System) or television reception in addition to a wireless communication unit that performs multicarrier transmission. When multicarrier transmission is performed in a mobile station having such other wireless communication units, it is assumed that intermodulation distortion due to the combination of multicarrier transmission frequencies affects the reception sensitivity of the other wireless communication units. . Conventionally, in order to reduce the influence of such intermodulation distortion on the reception sensitivity of other wireless communication units, proposals have been made to control the transmission parameters of one or both of the wireless transmission units during multicarrier transmission. ing. Specifically, a proposal has been made to control the transmission power of one or both of the radio transmission units during multicarrier transmission (see, for example, Patent Document 1). Moreover, there exists patent document 2 as a proposal considered to be related to this. By taking these measures, it is considered that the influence on the reception sensitivity of other wireless communication units can be suppressed.

JP 2014-192670 A JP 2014-116743 A

  However, if the transmission power is reduced during multi-carrier transmission, it is assumed that the throughput of multi-carrier transmission is reduced or communication itself is interrupted against the user's will. On the other hand, if the transmission power of multicarrier transmission is maintained, the reception sensitivity of other wireless communication units is affected.

  In one aspect, the wireless communication device, the wireless communication program, and the wireless communication method disclosed in the present specification appropriately control the influence on the reception sensitivity of other wireless communication units other than the wireless communication unit that performs multicarrier transmission. Is an issue.

  The wireless communication device disclosed in the present specification includes a first wireless communication unit that performs multicarrier transmission, a second wireless communication unit that is installed together with the first wireless communication unit, and the first wireless communication unit. Acquires and stores information on the influence of intermodulation distortion on the reception sensitivity of the second wireless communication unit due to the combination of frequencies of a plurality of wireless transmission units included, and the reception sensitivity of the second wireless communication unit A storage unit that stores a priority for the quality of multicarrier transmission performed by the first wireless communication unit and information on a transmission level of the wireless transmission unit that performs the multicarrier transmission determined in correspondence with the priority. And determining that the intermodulation distortion has an influence on the reception sensitivity of the second wireless communication unit based on the information on the influence on the reception sensitivity of the second wireless communication unit. A control unit that controls a transmission level of the wireless transmission unit that performs carrier transmission to a transmission level corresponding to a priority of reception sensitivity of the second wireless communication unit that is selected prior to execution of the multicarrier transmission; including.

  The wireless communication program disclosed in this specification determines whether multicarrier transmission by a plurality of wireless transmission units included in the first wireless communication unit is possible, and determines that the multicarrier transmission is possible , Based on the information on the influence of the intermodulation distortion on the reception sensitivity of the second wireless communication unit due to the combination of the frequencies of the plurality of wireless transmission units acquired in advance prior to the execution of the multicarrier transmission, When the presence / absence of the influence on the reception sensitivity of the wireless communication unit is determined and it is determined that the reception sensitivity of the second wireless communication unit is affected, the transmission level of the wireless transmission unit that performs the multi-carrier transmission is determined. Control to a transmission level corresponding to the priority of reception sensitivity of the second wireless communication unit selected prior to execution of the multicarrier transmission, and perform the multicarrier transmission; To perform the management to the computer.

  The wireless communication method disclosed in the present specification determines whether multicarrier transmission by a plurality of wireless transmission units included in a first wireless communication unit is possible, and determines that the multicarrier transmission is possible In this case, based on the information on the influence of the intermodulation distortion on the reception sensitivity of the second wireless communication unit due to the combination of the frequencies of the plurality of wireless transmission units acquired in advance prior to the execution of the multicarrier transmission, the first A step of determining whether there is an influence on the reception sensitivity of the second wireless communication section, and the wireless transmission section that performs the multicarrier transmission when it is determined that there is an influence on the reception sensitivity of the second wireless communication section The transmission level corresponding to the priority of the reception sensitivity of the second wireless communication unit selected prior to the execution of the multicarrier transmission, and the multicarrier transmission And a step to perform.

  According to the wireless communication device, the wireless communication program, and the wireless communication method disclosed in this specification, it is possible to appropriately control the influence on the reception sensitivity of other wireless communication units other than the wireless communication unit that performs multicarrier transmission.

FIG. 1 is an explanatory diagram illustrating an example of a hardware configuration of the mobile phone according to the embodiment. FIG. 2 is an explanatory view schematically showing the influence of mutual distortion modulation by multicarrier transmission. FIG. 3 is a flowchart illustrating an example of control of the mobile phone according to the embodiment. FIG. 4 is an example of an influence determination table for combinations of frequencies for performing multicarrier transmission and reception sensitivity. FIG. 5 is an example of a table showing the relationship between GPS reception sensitivity and GPS_S / N. FIG. 6 is an example of a table showing a combination pattern of GPS reception sensitivity priorities set in stages for multicarrier transmission. FIG. 7 is an example of a table showing a combination pattern of priority of reception sensitivity of DTV (terrestrial digital broadcasting) set in stages for multicarrier transmission. FIG. 8 is an example of a table for performing transmission power limitation when performing multicarrier transmission in the embodiment. FIG. 9 is an example of a table for performing transmission power limitation when performing multicarrier transmission in another embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, in the drawings, the dimensions, ratios, and the like of each part may not be shown so as to completely match the actual ones. Further, depending on the drawings, components that are actually present may be omitted for convenience of explanation, or dimensions may be exaggerated from the actual drawing.

(Embodiment)
First, the hardware configuration of the mobile phone 1 according to the embodiment will be described with reference to FIG. FIG. 1 is an explanatory diagram illustrating an example of a hardware configuration of the mobile phone 1. The cellular phone 1 includes a communication circuit 2, a GPS receiver 3, a DTV receiver 4, and a controller 5. A central processing unit (CPU) is incorporated in the control unit 5. The mobile phone 1 also includes a random access memory (RAM) 6, a read only memory (ROM) 7, a display 8, a microphone 9, a camera 10, and a touch panel 11 as a volatile storage unit. These elements are connected to each other by an internal bus 1a. At least the control unit 5 and the RAM 6 cooperate to realize a computer.

  A program stored in the ROM 7 is stored in the RAM 6 by the CPU in the control unit 5. When the control unit 5 executes the stored program, various functions described later are realized, and various operations are performed. Note that the program includes a wireless communication program. The operation of the mobile phone 1 by the wireless communication program will be described with reference to the flowchart shown in FIG.

  The mobile phone 1 is an example of a wireless communication device. The wireless communication apparatus may include a first wireless communication unit that performs multicarrier transmission and a second wireless communication unit that is installed separately from the first wireless communication unit, and may be a mobile station.

  The communication circuit 2 corresponds to a first wireless communication unit that performs multicarrier transmission. The communication circuit 2 includes an antenna 2a. The communication circuit 2 includes a plurality of wireless transmission units. Specifically, the communication circuit 2 includes a first wireless transmission unit 21, a second wireless transmission unit 22, a third wireless transmission unit 23, and a fourth wireless transmission unit 24. The first wireless transmission unit 21 to the fourth wireless transmission unit 24 each perform wireless transmission in a predetermined frequency band. In the following description, for convenience of explanation, each frequency band is represented by a center frequency. Specifically, the frequency of the first radio transmission unit 21 is the center frequency F1, the frequency of the second radio transmission unit 22 is the center frequency F2, the frequency of the third radio transmission unit 23 is the center frequency F3, and the frequency of the fourth radio transmission unit 24 is The frequency is represented as a center frequency F4. In the present embodiment, four wireless transmission units are provided. However, the communication circuit 2 only needs to include a plurality of wireless transmission units for the mobile phone 1 to perform multicarrier transmission, and the number thereof is four. It is not limited to.

  The communication circuit 2 can perform multicarrier transmission by operating a plurality of wireless transmission units among the first wireless transmission unit 21 to the fourth wireless transmission unit 24. Here, which one of the first wireless transmission unit 21 to the fourth wireless transmission unit 24 can perform multicarrier transmission depends on the relationship between the mobile phone 1 and the base station that performs transmission / reception. . For example, it is assumed that the base station capable of transmitting and receiving with the mobile phone 1 is only allowed to transmit at the frequency F1 of the first radio transmission unit 21 and to transmit at the frequency F2 of the second radio transmission unit 22. In this case, multicarrier transmission using the frequency F1 and the frequency F2 is possible, and multicarrier transmission using a combination of other frequencies is not performed.

  Each of the GPS receiver 3 and the DTV receiver 4 corresponds to a second wireless communication unit. The GPS receiving unit 3 includes an antenna 3a. The DTV receiving unit 4 includes an antenna 4a. The GPS receiver 3 and the DTV receiver 4 are installed in the mobile phone 1 together with the communication circuit 2 corresponding to the first wireless communication unit. For this reason, when multicarrier transmission is performed by the communication circuit 2, the reception sensitivity of the GPS receiving unit 3 and the DTV receiving unit 4 may be affected by intermodulation distortion caused by a combination of multicarrier transmission frequencies.

  Here, intermodulation distortion due to multicarrier transmission will be described with reference to FIG. FIG. 2 schematically illustrates the influence of multicarrier transmission using a combination of frequency f1 and frequency f2 on the DTV broadcast band (fa1 to fa2) as an example in which intermodulation distortion occurs. When multicarrier transmission is performed with a combination of the center frequency f1 and the center frequency f2, these two waves of intermodulation distortion components | f2-f1 | are generated in the DTV broadcast band. For this reason, it is considered that the reception sensitivity of terrestrial digital broadcasting is affected. Further, a fifth-order distortion component | 3 times f1−2 times f2 | is generated in the vicinity of fa1. Even if the value of the fifth-order distortion component | 3 times f1−2 times f2 | is out of the DTV broadcast band (fa1 to fa2), it is assumed that the reception sensitivity is affected. This is because each carrier has a bandwidth of several MHz, and sufficient attenuation may not be obtained only with the filter in the DTV receiving unit 4. Similar effects may occur in the GPS receiver 3. Therefore, the cellular phone 1 of the present embodiment takes measures when the reception sensitivity is affected in this way. This will be described in detail later.

  The second wireless communication unit is not limited to the GPS receiving unit 3 or the DTV receiving unit 4, and may be, for example, an FM / AM radio broadcast receiving unit.

  The ROM 7 functions as a storage unit. The ROM 7 relates to the influence of intermodulation distortion on the reception sensitivity of the GPS receiver 3 due to the combination of the frequencies F1 to F4 of the first wireless transmitter 21 to the fourth wireless transmitter 24, and the influence of the DTV receiver 4 on the reception sensitivity. Acquire and store information. In the present embodiment, the ROM 7 stores information regarding the influence on the reception sensitivity of the GPS receiver 3 and the influence on the reception sensitivity of the DTV receiver 4 as a table. This storage can be performed by uploading at the time of manufacturing the mobile phone 1 or updating a table by the user. That is, this table is stored in advance in the ROM 7 prior to execution of multicarrier transmission. An example of this table is shown in FIG. 4, and the contents will be described in detail later.

  The ROM 7 further stores a priority for the quality of multicarrier transmission performed by the communication circuit 2 of the reception sensitivity of the GPS receiver 3 and the DTV receiver 4 corresponding to the second wireless communication unit. In addition, the ROM 7 stores information related to the transmission levels of the first wireless transmission unit 21 to the fourth wireless transmission unit 24 that perform multicarrier transmission determined in correspondence with the priority. These pieces of information are collected in a table and stored in the ROM 7. Since these pieces of information are stored in the ROM 7, the user can select a priority for the quality of multicarrier transmission performed by the communication circuit 2 of the reception sensitivity of the GPS receiver 3 and the DTV receiver 4. . The selection of the priority for the quality of multicarrier transmission performed by the communication circuit 2 having the reception sensitivity of the GPS receiver 3 or the DTV receiver 4 involves a change in the transmission level of the first wireless transmitter 21 to the fourth wireless transmitter 24. . However, the user can select which of the reception sensitivity of the GPS reception unit 3 and the DTV reception unit 4 and the transmission level of the first wireless transmission unit 21 to the fourth wireless transmission unit 24 is prioritized. For this reason, it is possible to avoid any function being restricted against the user's will. An example of these tables is shown in FIG. 8, and the contents will be described in detail later.

  The control unit 5 determines whether multicarrier transmission by the communication circuit 2 is possible. Further, when the control unit 5 determines that multicarrier transmission is possible, the presence or absence of an influence on the reception sensitivity of the GPS reception unit 3 or the reception sensitivity of the DTV reception unit 4 due to the intermodulation distortion due to the multicarrier transmission. Determine. The control unit 5 controls the transmission level of the wireless transmission unit that performs multicarrier transmission when it is determined that the reception sensitivity of the GPS reception unit 3 or the reception sensitivity of the DTV reception unit 4 is affected. Perform carrier transmission. These specific controls will be described later in detail. In addition, the control part 5 is a warning part which notifies that these receiving sensitivities are restrict | limited when the priority of the receiving sensitivity of the GPS receiving part 3 or the DTV receiving part 4 is low and these receiving sensitivities are restrict | limited. Also works. Specifically, the control unit 5 displays on the display 8 that the reception sensitivity is limited.

  Next, an example of the operation of the mobile phone 1 will be described with reference to FIGS. FIG. 3 is a flowchart illustrating an example of control of the mobile phone 1 according to the embodiment. FIG. 4 is an example of an influence determination table for combinations of frequencies for performing multicarrier transmission and reception sensitivity. FIG. 5 is an example of a table showing the relationship between GPS reception sensitivity and GPS_S / N. FIG. 6 is an example of a table showing a combination pattern of GPS reception sensitivity priorities set in stages for multicarrier transmission. FIG. 7 is an example of a table showing a combination pattern of DTV reception sensitivity priorities set in stages for multicarrier transmission. FIG. 8 is an example of a table for performing transmission power limitation when performing multicarrier transmission in the embodiment. The operation of the mobile phone 1 is mainly performed by the control unit 5 based on various programs stored in the ROM 7.

  First, in step S1, it is determined whether or not the transmission power change process start condition of the communication circuit 2 is satisfied. Specifically, it is determined whether or not the mobile phone 1 has acquired control information from the base station, or whether or not changes in the operation status of the GPS receiver 3 and the DTV receiver 4 have been observed. Since the mobile phone 1 is a mobile station, it is assumed that the surrounding communication environment changes every moment. Such a change in the communication environment is determined by control information from the base station. When the mobile phone 1 moves and the communicable base station is changed, the combination of executable multicarrier transmission frequencies also changes. Further, if the operation status of the GPS receiving unit 3 and the DTV receiving unit 4 changes, the influence on the reception sensitivity due to multicarrier transmission also changes. Step S1 is intended to update the control content of the mobile phone 1 each time such a change is observed. When it is determined NO in step S1, the process is terminated after exiting the flow. On the other hand, when it determines with YES by step S1, it progresses to step S2.

  In step S2, it is determined whether or not multicarrier transmission by the communication circuit 2 is possible. This determination is made based on control information from the base station and setting information of the mobile phone 1. This is because if multicarrier transmission is not performed, it is not necessary to consider the influence of the multicarrier transmission on the reception sensitivity of the GPS receiver 3 and the DTV receiver 4. If the environment is such that multi-carrier transmission is not possible, NO is determined in step S2, and the process ends after exiting the flow. On the other hand, when it determines with YES by step S2, it progresses to step S3.

  In step S3, it is determined whether the GPS receiving unit 3 and the DTV receiving unit 4 corresponding to the second wireless communication unit are affected by intermodulation distortion due to multicarrier transmission. Specifically, the control unit 5 makes a determination by referring to the table shown in FIG. Referring to FIG. 4, it can be seen that the reception sensitivity of the DTV receiver 4 is affected when multi-carrier transmission is performed using a combination of the center frequency F1 and the center frequency F2. It can also be seen that the reception sensitivity of the GPS receiver 3 is affected when multi-carrier transmission is performed using a combination of the center frequency F1 and the center frequency F4. In step S3, it is determined whether or not the reception sensitivity of the GPS receiver 3 or DTV receiver 4 is affected by intermodulation distortion due to multicarrier transmission by referring to the table stored in the ROM 7 in advance. . For example, if it is determined that multi-carrier transmission using a combination of the center frequency F1 and the center frequency F4 is possible based on the control information from the base station that is being received at that time, the GPS receiver 3 It is determined that reception sensitivity is affected. If it is determined that multi-carrier transmission by the combination of the center frequency F1 and the center frequency F2 is possible based on the control information from the base station that is received at that time, the DTV receiving unit 4 It is determined that reception sensitivity is affected. With reference to the table shown in FIG. 4, if the reception sensitivity of the GPS receiver 3 or DTV receiver 4 is not affected by intermodulation distortion due to multicarrier transmission, it is determined as NO, and the process is terminated after exiting the flow. On the other hand, when it determines with YES at step S3, it progresses to step S4.

In this embodiment, information regarding the influence of the intermodulation distortion on the reception sensitivity of the GPS receiving unit 3 and the reception sensitivity of the DTV receiving unit 4 is held as a table. This information is calculated using a calculation formula. You may make it acquire. As the calculation formula, for example, the following formulas 1 to 3 are used. Expression 1 is an expression for calculating the frequency fIM generated by the intermodulation distortion, and Expression 2 is an expression for determining whether or not the frequency fIM is in the reception band of the DTV receiving unit 4. Expression 3 is an expression for determining whether or not the frequency fIM is in the reception band of the GPS receiver 3. If the frequency fIM satisfies the relationship of Equation 2 or Equation 3, YES is determined in Step S3.

fIM = | m × Freq1 ± n × Freq2 |
Here, Freq1 and Freq2 are center frequencies used for multicarrier transmission, and m and n are arbitrary integers indicating the magnification of the center frequency.

fa1 <fIM <fa2 Formula 2
Here, fa1 is a lower limit value of the reception band of the DTV reception unit 4, and fa2 is an upper limit value of the reception band of the DTV reception unit 4.

fb1 <fIM <fb2 Equation 3
Here, fb1 is a lower limit value of the reception band of the GPS reception unit 3, and fb2 is an upper limit value of the reception band of the GPS reception unit 3.

  In step S4, it is determined whether or not the second wireless communication unit determined to have an influence on the reception sensitivity is activated. Specifically, when it is determined that the reception sensitivity of the GPS reception unit 3 is affected, it is determined whether the GPS reception unit 3 is activated or not, and the reception sensitivity of the DTV reception unit 4 is affected. Sometimes it is determined whether or not the DTV receiving unit 4 is activated. If the receiving unit determined to have an influence on the reception sensitivity is not activated, the reception sensitivity is not affected. Therefore, in this case, it is determined as NO in step S4, and the process ends after exiting the flow. On the other hand, when it determines with YES at step S4, it progresses to step S5. Note that “the second wireless communication unit is activated” in step 4 is automatically performed by the cellular phone 1 in addition to when the user of the cellular phone 1 intentionally activates the GPS receiving unit 3 or the DTV receiving unit 4. It also includes the case of starting up automatically. For example, a case where the DTV receiving unit 4 is activated without the user being aware of it, such as a recording operation by a program, is also included.

  In step S5, it is determined whether a pattern giving priority to the quality of multicarrier transmission is selected. Here, the priority of the reception sensitivity of the GPS receiver 3 will be described. Note that the priority of the reception sensitivity of the DTV receiving unit 4 is the same as the priority of the reception sensitivity of the GPS receiving unit 3, and the description thereof will be omitted. The priority of the reception sensitivity of the GPS receiver 3 is a priority for multicarrier transmission performed by the communication circuit 2. Therefore, if the priority of the reception sensitivity of the GPS receiver 3 increases, the priority with respect to the quality of multicarrier transmission performed by the communication circuit 2 decreases. The priority of the reception sensitivity of the GPS receiver 3 is set in stages. It is known that the positioning accuracy and positioning time of the GPS receiver 3, that is, the reception sensitivity, depends on the S / N (Signal / Noise) of the received signal. Here, the relationship between the reception sensitivity of the GPS receiver 3 and GPS_S / N, which is the S / N of the GPS receiver 3, is shown in the table of FIG. If GPS_S / N is equal to or greater than X2 (dB), the reception sensitivity is in a state where the design regulation value can be cleared. The design specified value can be set arbitrarily, but may be a value indicating a state in which the highest performance of the GPS receiver 3 is exhibited, for example. If GPS_S / N is X1 (dB) to X2 (dB), the reception sensitivity is in a state where actual use is possible. If GPS_S / N is less than or equal to X1 (dB), the reception sensitivity is in an unusable state. Note that the magnitude relationship between X1 and X2 is X1 <X2, and GPS_S / N has higher reception sensitivity as its numerical value increases.

  In the present embodiment, a combination pattern of priorities as shown in FIG. 6 is set on the premise of the relationship between the reception sensitivity of the GPS receiver 3 shown in FIG. 5 and GPS_S / N. Specifically, a pattern that prioritizes the quality of multicarrier transmission, a pattern that balances the reception sensitivity of the GPS receiver 3 and the quality of multicarrier transmission, and a pattern that prioritizes the reception sensitivity of the GPS receiver 3 are set. Yes. Thus, in this embodiment, three patterns are set step by step.

  In a pattern in which priority is given to the quality of multicarrier transmission, the transmission level of multicarrier transmission is not limited. Thereby, the quality of multicarrier transmission is ensured. On the other hand, the reception sensitivity of the GPS receiver 3 may be greatly affected. In this case, in this embodiment, a warning is given to inform that the reception sensitivity of the GPS receiver 3 is limited.

  In the pattern for achieving both the reception sensitivity of the GPS receiver 3 and the quality of multicarrier transmission, the degree of decrease in the reception sensitivity of the GPS receiver 3 is stopped at a level where it can be actually used, and the transmission level of multicarrier transmission is limited. Also keep it to a minimum. Specifically, the restriction on the transmission level of multicarrier transmission is stopped to the extent that X1 <GPS_S / N <X2 is realized. As a result, both are compatible.

  In the pattern in which the reception sensitivity of the GPS receiver 3 is prioritized, the transmission level of multicarrier transmission is limited until X2 ≦ GPS_S / N is realized.

  These patterns are selected according to the intention of the designer or user. For example, the user can select one of these patterns according to his / her own intention before executing the multi-carrier transmission. Thereby, the user can appropriately control the influence on the reception sensitivity of the GPS receiving unit according to his / her will. In the present embodiment, such three patterns are set, but the number of patterns is not limited to three.

  FIG. 7 shows a combination pattern of priorities for the DTV receiving unit 4. As with the GPS receiver 3, the DTV receiver 4 is also set with three patterns stepwise. When the reception sensitivity of the DTV receiving unit 4 is affected, the DTV receiving unit 4 is in a view-disabled state if a pattern that prioritizes the quality of multicarrier transmission is selected. Further, in a pattern in which both the reception sensitivity of the DTV receiving unit 4 and the quality of multicarrier transmission are achieved, the DTV receiving unit 4 is in a state in which only one segment (one segment broadcasting) can be viewed. Furthermore, in the pattern in which the reception sensitivity of the DTV receiving unit 4 is prioritized, the DTV receiving unit 4 is in a state where it can watch full segment (full segment broadcasting). In the present embodiment, the same three patterns are set for both the GPS receiver 3 and the DTV receiver 4, but the contents of both patterns may be different, and the number of patterns is different for both. You may do it.

  In the cellular phone 1, the priority for the quality of multicarrier transmission performed by the communication circuit 2 of the reception sensitivity of the GPS receiver 3 and the DTV receiver 4 corresponding to the second wireless communication unit is stored in the ROM 7. In addition, the mobile phone 1 stores information on the transmission levels of the first wireless transmission unit 21 to the fourth wireless transmission unit 24 that performs multicarrier transmission determined according to the priority in the ROM 7. Specifically, the mobile phone 1 stores a table shown in FIG. FIG. 8 shows an example of a table, and shows a table for performing transmission power limitation when performing multicarrier transmission using the first radio transmission unit 21 and the second radio transmission unit 22. The table shown in FIG. 8 is used when the GPS receiver 3 is affected by intermodulation distortion due to multicarrier transmission using the first radio transmitter 21 and the second radio transmitter 22. The cellular phone 1 according to the present embodiment includes such a table for each combination of wireless transmission units that may perform multicarrier transmission and for each target second wireless communication unit. In this case, each table can be set to different contents. Also, a common table may be used for different combinations of wireless transmission units and different second wireless communication units. In the following description, the table shown in FIG. 8 is used. That is, the case where the GPS receiver 3 is affected by intermodulation distortion due to multicarrier transmission using the first radio transmitter 21 and the second radio transmitter 22 will be described.

  The control unit 5 determines the transmission power limit value [dB] based on this table, and controls the transmission levels of the first radio transmission unit 21 and the second radio transmission unit 22 that perform multicarrier transmission. In the table shown in FIG. 8, a pattern giving priority to the quality of multicarrier transmission is defined in the row (1). Further, a pattern for achieving both the reception sensitivity of the GPS receiver 3 and the quality of multicarrier transmission is defined in the row (4). Furthermore, a pattern giving priority to the reception sensitivity of the GPS receiver 3 is defined in the row (8). The table includes information on the transmission level of the wireless transmission unit that performs multicarrier transmission. The transmission level is determined by how much the maximum transmission power value [dBm] is limited in each of the first wireless transmission unit 21 and the second wireless transmission unit 22. Therefore, the transmission power value [dBm] that is not restricted means the maximum transmission power value [dBm] that can be exhibited by the first wireless transmission unit 21 to the fourth wireless transmission unit 24. In the table shown in FIG. 8, the relative value [dB] with respect to the maximum transmission power value [dBm] expressed as an absolute power value is represented. For example, when the transmission level is not limited, the transmission power limit value that is a relative value with respect to the maximum transmission power value [dBm] is 0 [dB].

  Information on the transmission level is determined in correspondence with each pattern. For example, in the pattern in which priority is given to the quality of multicarrier transmission in (1), the transmission power value [dBm] in which the transmission level of the first radio transmission unit 21 and the transmission level of the second radio transmission unit 22 are not restricted. Is allowed to be sent. That is, the transmission power limit value is 0 [dB], and transmission at the maximum transmission power value [dBm] is permitted.

  Further, in the pattern (4) in which the reception sensitivity of the GPS receiver 3 and the quality of multicarrier transmission are compatible, the transmission level of the first wireless transmitter 21 is expressed as 0 [dB] in FIG. Is set to a transmission power value [dBm] that is not limited to. Then, the transmission level of the second wireless transmission unit 22 is limited. Specifically, the transmission level of the second wireless transmission unit 22 is set to a value obtained by changing the maximum transmission power value [dBm] of the second wireless transmission unit 22 to −3 [dB]. As a result, the transmission level of the second wireless transmission unit 22 is limited to the maximum transmission power value −3 [dB].

  In the pattern (8) in which the reception sensitivity of the GPS receiver 3 is prioritized, both the transmission level of the first wireless transmission unit 21 and the transmission level of the second wireless transmission unit 22 are limited. Specifically, the transmission level of the first wireless transmission unit 21 is set to a value that is set to -4 [dB] from the maximum transmission power value [dBm] of the first wireless transmission unit 21. As a result, the transmission level of the first wireless transmission unit 21 is limited to the maximum transmission power value −4 [dB]. On the other hand, the transmission level of the second wireless transmission unit 22 is set to a value that is set to −5 [dB] from the maximum transmission power value [dBm] of the second wireless transmission unit 22. As a result, the transmission level of the second wireless transmission unit 22 is limited to the maximum transmission power value −5 [dB].

  In the table shown in FIG. 8, numerical values related to transmission power values are stored in rows other than rows (1), (4), and (8). These numerical values measure the reception quality of the GPS receiver 3 during multicarrier transmission, and based on the measurement result of the reception quality, the first wireless transmission unit 21 and the second wireless transmission unit 22 perform multicarrier transmission. Used when adjusting the transmission level. That is, the numerical values stored in the rows other than the rows (1), (4), and (8) are values used for feedback control. This transmission level adjustment will be described later.

  When the mobile phone 1 is in use, one of the three patterns is selected. Accordingly, in step S5, it is determined which of these three patterns is selected. At this point, when a pattern giving priority to the quality of multicarrier transmission is selected, it is determined as YES in Step S5, and the process proceeds to Step S6. On the other hand, when a pattern that prioritizes the quality of multicarrier transmission is not selected, that is, a pattern that achieves both the reception sensitivity of the GPS receiver 3 and the quality of multicarrier transmission, or a pattern that prioritizes the reception sensitivity of the GPS receiver 3 If is selected, the process proceeds to step S7. In addition, since the order of the process of step S2-step S5 is not ask | required, you may replace the order of these processes.

  In step S6, the display 8 is displayed to notify that the reception sensitivity of the GPS receiver 3 is limited. This is processing for notifying the user that the GPS receiving unit 3 may be in an unusable state due to selection of a pattern that prioritizes the quality of multicarrier transmission. After step S6, the process ends. In addition, the user who has received such a warning operates the mobile phone 1 by himself / herself, and a pattern for achieving compatibility between the reception sensitivity of the GPS receiver 3 and the quality of multicarrier transmission or a pattern that prioritizes the reception sensitivity of the GPS receiver 3 It is possible to escape from the state in which the reception sensitivity of the GPS receiver 3 is limited by reselecting.

  In step S7, the transmission levels of the first radio transmission unit 21 and the second radio transmission unit 22 that perform multicarrier transmission correspond to the priority of the reception sensitivity of the GPS reception unit 3 selected prior to the execution of multicarrier transmission. Control the transmission level. Specifically, the transmission level of the first radio transmission unit 21 and the transmission level of the second radio transmission unit 22 are controlled based on the table shown in FIG. When a pattern for achieving both the reception sensitivity of the GPS receiver 3 and the quality of multicarrier transmission is selected, the transmission level of the first wireless transmitter 21 is set to the transmission power value [dBm] that is not restricted. To do. Further, the transmission level of the second radio transmission unit 22 is limited to the maximum transmission power value −3 [dB]. When the pattern giving priority to the reception sensitivity of the GPS receiver 3 is selected, the transmission level of the first wireless transmitter 21 is limited to the maximum transmission power value −4 [dB]. Further, the transmission level of the second radio transmission unit 22 is limited to the maximum transmission power value −5 [dB]. After the processing up to step S7 is completed, the process waits until multicarrier transmission is actually executed. That is, when multicarrier transmission is executed, the first radio transmission unit 21 and the second radio transmission unit 22 are in a state of being controlled to a transmission level based on user settings.

  In step S8 performed subsequent to step S7, multicarrier transmission is actually started. Then, in step S9 performed subsequent to step S8, the reception quality of the second wireless communication unit is acquired, and in step S10, it is determined whether or not the acquired reception quality is a desired quality. For example, when the second wireless communication unit is the GPS receiver 3 and a pattern for achieving both the reception sensitivity of the GPS receiver 3 and the quality of multicarrier transmission is selected, X1 <GPS_S / N <X2 It is determined whether or not. When the second wireless communication unit is the GPS receiving unit 3 and a pattern that prioritizes the reception sensitivity of the GPS receiving unit 3 is selected, it is determined whether X2 ≦ GPS_S / N. For the reception quality, an evaluation index other than S / N may be used. In addition, a conventionally known method can be adopted for the reception quality measurement. For example, RSSI (Received Signal Strength Indication) indicating the reception quality of the wireless system, BER (Bit Error Rate), BLER (Block Error Ratio), and throughput can be used. Moreover, you may use the evaluation parameter | index which shows the intensity | strength and quality of the reception power of WCDMA (Wideband Code Division Multiple Access, registered trademark) and a LTE (Long Term Evolution) radio | wireless system. For example, RSCP (Received Signal Code Power), RSRP (Reference Signal Received Power), or RSRQ (Reference Signal Received Quality) can be used.

  When it determines with YES in step S10, a series of processes are complete | finished. On the other hand, if NO is determined in step S10, the process proceeds to step S11. In step S11, the transmission level is reset. Specifically, the transmission levels of the first wireless transmission unit 21 and the second wireless transmission unit 22 are represented by values in the rows (2) and (3), values in the rows (5) to (7) in the table shown in FIG. 9) to (11) Reset to any of the values in the row. Which value is set is determined based on the degree of deviation from the desired reception quality.

  There is a possibility that distortion characteristics such as intermodulation vary depending on individual differences of components constituting the mobile phone 1. Therefore, multicarrier transmission is performed at a transmission level selected prior to the execution of multicarrier transmission, and the quality during the transmission operation is measured. If the desired result is not obtained, the power limit value, that is, the transmission level is updated. After resetting the transmission level, the processes in steps S9 and S10 are performed again. Thereby, the reception quality based on the user setting can be obtained.

  In the above description, the case where the GPS receiving unit 3 is affected by the intermodulation distortion after Step S5 has been described, but the same applies to the case where the DTV receiving unit 4 is affected by the intermodulation distortion. That is, in the mobile phone 1, the ROM 7 stores a table similar to that in FIG. 8 for the DTV receiver 4. However, the specific transmission level may be set differently in the GPS receiver 3 and the DTV receiver 4.

  In this embodiment, the countermeasure against the influence of the intermodulation distortion caused by the combination of the frequencies of the two wireless transmission units is taken. However, the same applies to the influence of the intermodulation distortion caused by the combination of the frequencies of the three or more wireless transmission units. Measures can be taken. For example, a table as shown in FIG. 9 can be provided for the influence of intermodulation distortion caused by the combination of frequencies of the first wireless transmission unit 21, the second wireless transmission unit 22, and the third wireless transmission unit 23. . That is, the countermeasure against the influence of intermodulation distortion of the present embodiment can be extended to n frequencies and generalized and applied.

  The above processing functions can be realized by a computer. In that case, a program describing the processing contents of the functions that the processing apparatus should have is provided. By executing the program on a computer, the above processing functions are realized on the computer. The program describing the processing contents can be recorded on a computer-readable recording medium (except for a carrier wave).

  When the program is distributed, for example, it is sold in the form of a portable recording medium such as a DVD (Digital Versatile Disc) or a CD-ROM (Compact Disc Read Only Memory) on which the program is recorded. It is also possible to store the program in a storage device of a server computer and transfer the program from the server computer to another computer via a network.

  The computer that executes the program stores, for example, the program recorded on the portable recording medium or the program transferred from the server computer in its own storage device. Then, the computer reads the program from its own storage device and executes processing according to the program. The computer can also read the program directly from the portable recording medium and execute processing according to the program. Further, each time the program is transferred from the server computer, the computer can sequentially execute processing according to the received program.

  Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment, and various modifications, within the scope of the gist of the present invention described in the claims, It can be changed.

In addition, the following additional remarks are disclosed regarding description of the above embodiment.
(Supplementary Note 1) A first wireless communication unit that performs multicarrier transmission;
A second wireless communication unit installed together with the first wireless communication unit;
Acquires and stores information on the influence of intermodulation distortion on the reception sensitivity of the second wireless communication unit due to the combination of frequencies of a plurality of wireless transmission units included in the first wireless communication unit, and the second The priority of the reception sensitivity of the wireless communication unit with respect to the quality of multicarrier transmission performed by the first wireless communication unit, and the transmission level of the wireless transmission unit that performs the multicarrier transmission determined according to the priority A storage unit for storing information on
The multicarrier transmission is performed when it is determined that the intermodulation distortion has an influence on the reception sensitivity of the second wireless communication unit based on information on the influence on the reception sensitivity of the second wireless communication unit A control unit that controls the transmission level of the radio transmission unit to a transmission level corresponding to the priority of the reception sensitivity of the second radio communication unit that is selected prior to the execution of the multicarrier transmission;
A wireless communication device including
(Additional remark 2) The said control part performs the said multicarrier transmission performed by the transmission level corresponding to the priority of the receiving sensitivity of the said 2nd radio | wireless communication part selected prior to execution of the said multicarrier transmission. The wireless communication apparatus according to appendix 1, wherein the reception quality of the second wireless communication unit is measured, and control is performed to adjust the transmission level of the wireless transmission unit that performs the multicarrier transmission based on the measurement result of the reception quality. .
(Additional remark 3) The said memory | storage part contains the information regarding the influence on the receiving sensitivity of the said 2nd radio | wireless communication part of the intermodulation distortion by the combination of the frequency of these radio | wireless transmission parts contained in the said 1st radio | wireless communication part. The wireless communication apparatus according to appendix 1 or 2, which is stored in advance as a table prior to execution of the multicarrier transmission.
(Supplementary Note 4) When the reception sensitivity of the second wireless communication unit is limited due to the fact that the priority of the reception sensitivity of the second wireless communication unit is set low, the second wireless communication The wireless communication device according to any one of appendices 1 to 3, further comprising a warning unit that notifies that the reception sensitivity of the unit is limited.
(Supplementary Note 5) The priority of the reception sensitivity of the second wireless communication unit is set in stages, and at least the pattern giving priority to the quality of the multicarrier transmission and the reception sensitivity of the second wireless communication unit 5. The wireless communication device according to claim 1, further comprising: a pattern that achieves both the quality of the multicarrier transmission and a pattern that prioritizes reception sensitivity of the second wireless communication unit.
(Additional remark 6) When the control information from a base station is acquired, or when the change of the operation condition of the said 2nd wireless communication part is observed, the said 1st wireless communication part memorize | stored in the said memory | storage part Presence or absence of influence on the reception sensitivity of the second wireless communication unit based on information on the influence of intermodulation distortion on the reception sensitivity of the second wireless communication unit due to the combination of frequencies of a plurality of wireless transmission units included in The wireless communication device according to any one of supplementary notes 1 to 5, wherein a transmission level of the wireless transmission unit that performs the multicarrier transmission is controlled based on the determination result.
(Supplementary note 7) It is determined whether multicarrier transmission by a plurality of radio transmission units included in the first radio communication unit is possible,
When it is determined that the multicarrier transmission is possible, the reception sensitivity of the second wireless communication unit of the intermodulation distortion due to the combination of the frequencies of the plurality of wireless transmission units acquired in advance prior to the execution of the multicarrier transmission On the basis of the information on the influence on the reception of the second wireless communication unit to determine whether there is an influence on the reception sensitivity,
The transmission level of the wireless transmission unit that performs the multicarrier transmission is selected prior to the execution of the multicarrier transmission when it is determined that the reception sensitivity of the second wireless communication unit is affected. 2 to control the transmission level corresponding to the priority of the reception sensitivity of the wireless communication unit, to perform the multi-carrier transmission,
A wireless communication program that causes a computer to execute processing.
(Supplementary Note 8) The second wireless communication during multicarrier transmission performed at a transmission level corresponding to the priority of reception sensitivity of the second wireless communication unit selected prior to execution of the multicarrier transmission. Measure the reception quality of the
The wireless communication program according to appendix 7, further causing a computer to execute a process of adjusting a transmission level of the wireless transmission unit that performs the multicarrier transmission based on the measurement result of the reception quality.
(Supplementary Note 9) In a table in which information on the influence of intermodulation distortion on the reception sensitivity of the second wireless communication unit due to the combination of frequencies of the plurality of wireless transmission units included in the first wireless communication unit is stored The wireless communication program according to appendix 7 or 8, further causing the computer to execute a process of determining whether or not there is an influence on the reception sensitivity of the second wireless communication unit.
(Supplementary note 10) When the reception sensitivity of the second wireless communication unit is limited due to the fact that the priority of the reception sensitivity of the second wireless communication unit is set low, the second wireless communication The wireless communication program according to any one of appendices 7 to 9, further causing the computer to execute a process of notifying that the reception sensitivity of the unit is limited.
(Additional remark 11) When the control information from a base station is acquired, or when the change of the operation condition of the said 2nd radio | wireless communication part is observed, the transmission level of the said radio | wireless transmission part which performs the said multicarrier transmission is set. Any one of appendixes 7 to 10 for causing a computer to execute a process of controlling the transmission level corresponding to the priority of the reception sensitivity of the second wireless communication unit selected prior to the execution of the multicarrier transmission. The wireless communication program described.
(Supplementary Note 12) A step of determining whether or not multicarrier transmission by a plurality of wireless transmission units included in the first wireless communication unit is possible;
When it is determined that the multicarrier transmission is possible, the reception sensitivity of the second wireless communication unit of the intermodulation distortion due to the combination of the frequencies of the plurality of wireless transmission units acquired in advance prior to the execution of the multicarrier transmission Determining whether there is an influence on the reception sensitivity of the second wireless communication unit based on information on the influence on
The transmission level of the wireless transmission unit that performs the multicarrier transmission is selected prior to the execution of the multicarrier transmission when it is determined that the reception sensitivity of the second wireless communication unit is affected. Controlling to a transmission level corresponding to the priority of the reception sensitivity of the two wireless communication units, and performing the multi-carrier transmission;
A wireless communication method including:
(Supplementary Note 13) The second wireless communication during multicarrier transmission executed at a transmission level corresponding to the priority of the reception sensitivity of the second wireless communication unit selected prior to execution of the multicarrier transmission. Measuring the reception quality of the part,
Adjusting the transmission level of the radio transmission unit that performs the multi-carrier transmission based on the measurement result of the reception quality;
The wireless communication method according to appendix 12, further comprising:
(Supplementary Note 14) In a table storing information on the influence of intermodulation distortion on the reception sensitivity of the second wireless communication unit due to the combination of frequencies of the plurality of wireless transmission units included in the first wireless communication unit The wireless communication method according to appendix 12 or 13, wherein the presence or absence of an influence on the reception sensitivity of the second wireless communication unit is determined based on.
(Supplementary Note 15) When the reception sensitivity of the second wireless communication unit is limited because the priority of the reception sensitivity of the second wireless communication unit is set low, the second wireless communication 15. The wireless communication method according to any one of appendices 12 to 14, further comprising a step of notifying that the reception sensitivity of the unit is limited.
(Additional remark 16) When the control information from a base station is acquired, or when the change of the operation condition of the said 2nd radio | wireless communication part is observed, the transmission level of the said radio | wireless transmission part which performs the said multicarrier transmission is set. The wireless communication method according to any one of appendices 12 to 15, wherein control is performed to a transmission level corresponding to a priority of reception sensitivity of the second wireless communication unit selected prior to execution of the multicarrier transmission.

DESCRIPTION OF SYMBOLS 1 Mobile phone 2 Communication circuit 3 GPS receiving part 4 DTV receiving part 5 Control part 6 RAM
7 ROM
21 1st wireless transmission part 22 2nd wireless transmission part 23 3rd wireless transmission part 24 4th wireless transmission part

Claims (8)

A first wireless communication unit that performs multicarrier transmission;
A second wireless communication unit installed together with the first wireless communication unit;
Acquires and stores information on the influence of intermodulation distortion on the reception sensitivity of the second wireless communication unit due to the combination of frequencies of a plurality of wireless transmission units included in the first wireless communication unit, and the second The priority of the reception sensitivity of the wireless communication unit with respect to the quality of multicarrier transmission performed by the first wireless communication unit, and the transmission level of the wireless transmission unit that performs the multicarrier transmission determined according to the priority A storage unit for storing information on
The multicarrier transmission is performed when it is determined that the intermodulation distortion has an influence on the reception sensitivity of the second wireless communication unit based on information on the influence on the reception sensitivity of the second wireless communication unit A control unit that controls the transmission level of the radio transmission unit to a transmission level corresponding to the priority of the reception sensitivity of the second radio communication unit that is selected prior to the execution of the multicarrier transmission;
A wireless communication device including   The control unit is configured to transmit the second radio during multicarrier transmission performed at a transmission level corresponding to a priority of reception sensitivity of the second radio communication unit selected prior to execution of the multicarrier transmission. The radio communication apparatus according to claim 1, wherein control is performed to measure reception quality of a communication unit and adjust a transmission level of the radio transmission unit that performs the multicarrier transmission based on a measurement result of the reception quality.   The storage unit stores, as a table, information on the influence of intermodulation distortion on the reception sensitivity of the second wireless communication unit due to a combination of frequencies of the plurality of wireless transmission units included in the first wireless communication unit as a table. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is stored in advance prior to execution of carrier transmission.   The reception sensitivity of the second wireless communication unit when the reception sensitivity of the second wireless communication unit is limited due to the fact that the priority of the reception sensitivity of the second wireless communication unit is set low. The wireless communication apparatus according to any one of claims 1 to 3, further comprising a warning unit that notifies that the communication is restricted.   The priority of the reception sensitivity of the second wireless communication unit is set in stages, at least a pattern that prioritizes the quality of the multicarrier transmission, the reception sensitivity of the second wireless communication unit, and the multicarrier 5. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus includes a pattern that achieves both transmission quality and a pattern that prioritizes reception sensitivity of the second wireless communication unit.   When the control information from the base station is acquired or when a change in the operating status of the second wireless communication unit is observed, a plurality of pieces included in the first wireless communication unit stored in the storage unit Determining whether or not there is an influence on the reception sensitivity of the second wireless communication unit based on information on the influence of the intermodulation distortion on the reception sensitivity of the second wireless communication unit due to the combination of the frequencies of the wireless transmission unit, The wireless communication device according to claim 1, wherein a transmission level of the wireless transmission unit that performs the multicarrier transmission is controlled based on the determination result. Determining whether multicarrier transmission by a plurality of radio transmission units included in the first radio communication unit is possible;
When it is determined that the multicarrier transmission is possible, the reception sensitivity of the second wireless communication unit of the intermodulation distortion due to the combination of the frequencies of the plurality of wireless transmission units acquired in advance prior to the execution of the multicarrier transmission On the basis of the information on the influence on the reception of the second wireless communication unit to determine whether there is an influence on the reception sensitivity,
The transmission level of the wireless transmission unit that performs the multicarrier transmission is selected prior to the execution of the multicarrier transmission when it is determined that the reception sensitivity of the second wireless communication unit is affected. 2 to control the transmission level corresponding to the priority of the reception sensitivity of the wireless communication unit, to perform the multi-carrier transmission,
A wireless communication program that causes a computer to execute processing. Determining whether multicarrier transmission by a plurality of wireless transmission units included in the first wireless communication unit is possible;
When it is determined that the multicarrier transmission is possible, the reception sensitivity of the second wireless communication unit of the intermodulation distortion due to the combination of the frequencies of the plurality of wireless transmission units acquired in advance prior to the execution of the multicarrier transmission Determining whether there is an influence on the reception sensitivity of the second wireless communication unit based on information on the influence on
The transmission level of the wireless transmission unit that performs the multicarrier transmission is selected prior to the execution of the multicarrier transmission when it is determined that the reception sensitivity of the second wireless communication unit is affected. Controlling to a transmission level corresponding to the priority of the reception sensitivity of the two wireless communication units, and performing the multi-carrier transmission;
A wireless communication method including:

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