JP2016054476A - Communication terminal device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a mobile communication terminal that a carrier or a communication method suppressing power consumption or a communication charge with satisfactory communication quality cannot be selected.SOLUTION: When communication quality in a communication method currently in use becomes lower than a predetermined value, in regard to communication of at least one of other communication methods, one method is selected for the communication from communication methods in which stored power consumption or a communication charge is lower than the communication method in use, among communication methods in which determined quality is a predetermined value or more, so that communication is performed using the selected communication method.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a communication terminal apparatus and method.

  In a mobile communication terminal, it is possible to selectively receive communication services from a plurality of carriers by making a SIM (Subscriber Identity Module) free, a plurality of SIM implementations, and the like. It is also possible to selectively receive a communication service from a plurality of communication methods. However, in that case, the carrier and the communication method for receiving the communication service are selected by the user. For example, in a terminal that supports a wireless LAN and an LTE communication system of a plurality of carriers, if the throughput of the used wireless LAN cannot be obtained, the user switches from the wireless LAN to the LTE of the carrier that can obtain the throughput. Is done. LAN is an abbreviation for Local Area Network and LTE is Long Term Evolution. At this time, the user is not always able to select LTE of the optimum quality, and the work related to the switching becomes a burden on the user. As described above, the selection of the carrier or communication system that receives the communication service depends on the user.

  A technique for solving such a problem is described in Patent Document 1.

  That is, the wireless communication terminal described in Patent Literature 1 can temporarily change the configuration of the integrated circuit unit based on the configuration data of the integrated circuit unit stored in the database and replace it with the communication method used. Tries and evaluates communication using other communication methods. Thus, the wireless communication terminal performs communication by selecting a highly evaluated communication method.

  As described above, the wireless communication terminal described in Patent Document 1 evaluates the communication quality of the communication method and selects a communication method with a high evaluation. It is possible to make the selection of the method independent of the user.

JP 2004-343559 A

  With the technique described in Patent Document 1, selection of a carrier that receives a communication service and a communication method can be made independent of the user. However, the selected carrier or communication method with good communication quality may have higher power consumption or higher communication charges than other carriers or communication methods. That is, with the technique described in Patent Document 1, even if a carrier or communication method with good communication quality is selected, the power consumption of the wireless communication terminal may increase or the communication fee may increase. That is, in the mobile communication terminal, it is a problem that it is not possible to select a carrier or a communication method that has good communication quality and can reduce power consumption or communication charge.

  The objective of this invention is providing the communication terminal device and method which solve this subject.

  The communication terminal device of the present invention, when the communication quality in the communication method used is less than a predetermined value, for each of at least one other communication method, the determined quality is higher than the predetermined value for the communication concerned Among the communication methods, one is selected from communication methods whose stored power consumption or communication charge is lower than that of the communication method being used, and communication is performed using the selected communication method.

  The communication terminal device control method according to the present invention determines, when communication quality in a communication method used in a communication terminal device is less than a predetermined value, for each of at least one other communication method. Of the communication methods whose quality is equal to or higher than a predetermined value, select one communication method whose power consumption or communication charge stored in the device is lower than that of the communication method used, and the selected Communication is performed by a communication method.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to select the carrier and communication system which are favorable in communication quality, and can suppress power consumption or a communication charge in a portable communication terminal.

It is a figure which shows the structural example of the communication network containing the portable communication terminal in the 1st Embodiment of this invention. It is a table | surface which shows the example of the priority table in the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the portable communication terminal in the 1st Embodiment of this invention. It is a table | surface which shows the example of the priority table in the 1st Embodiment of this invention. It is a figure which shows the structural example of the communication network containing the portable communication terminal in the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the portable communication terminal in the 2nd Embodiment of this invention. It is a figure which shows the structural example of the communication terminal device in the 3rd Embodiment of this invention.

  A first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration example of a communication network including a mobile communication terminal in the present embodiment. The communication network includes a mobile communication terminal 10 and an upper station 20. The mobile communication terminal 10 performs communication via the upper station 20. The mobile communication terminal 10 includes a communication unit 11, a priority table 12, a communication measurement unit 13, a remaining battery / charge calculation unit 14, and a communication selection unit 15.

  Each part of the mobile communication terminal 10 will be described.

  The communication unit 11 has a function of performing communication corresponding to each of a plurality of carriers and communication methods, and performs communication as an operation state using any of the carriers and communication methods. In each carrier and communication method, communication quality measurement by the communication measurement unit 13 is possible in an operation state, a standby state, and a power saving state.

  In the priority table 12, power consumption and communication charges related to communication are input in advance for each of a plurality of carriers and communication methods. Further, the reception level, reception quality such as CQI (Channel Quality Indicator) measured by the communication measurement unit 13, and communication quality such as throughput are input, and the remaining battery level calculated by the remaining battery level / charge calculation unit 14 is input. Or a communication charge that has already been generated is entered.

  The communication measurement unit 13 measures communication quality such as reception level, reception quality such as CQI, and throughput in the communication unit 11 for each of a plurality of carriers and communication methods.

  The remaining battery charge / charge calculator 14 calculates the remaining battery charge of the mobile communication terminal 10 or the communication charge that has already been generated.

  The communication selection unit 15 prioritizes carriers and communication methods based on the priority table 12, and selects a carrier and communication method to be put into an operation state.

  Based on the above configuration example, the operation of the mobile communication terminal 10 in the present embodiment will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of the mobile communication terminal in this embodiment.

  The user inputs in advance the power consumption and the communication fee (predetermined) relating to the communication by each of a plurality of carriers and communication methods to be used in the priority table 12. FIG. 2 is a table showing an example of the priority order table 12. In FIG. 2, for the carrier / communication method, the carrier and the communication method are input. For power consumption and communication charges, for example, numerical values per unit time may be input, but in FIG. 2, the numerical ranges for all carriers and communication methods are divided into high, medium, and low. One of the high, medium, and low ranges applicable to the method is entered. As for the communication state, each carrier and communication method is set to one of operation, standby, and power saving as an initial value, and the number of carriers and communication methods set in each state is 1 in the operation state and the standby state. 1 or more, and the power saving state becomes 0 or more. FIG. 2 shows a case where the number of carriers and communication methods set in the standby state is 5, and the number of carriers and communication methods set in the power saving state is 1. Further, the number of carriers and communication methods set in the operation state is one.

  The circuit and processing related to the carrier and communication method set in the operation state perform normal operations. The circuit and processing related to the carrier and communication method set in the standby state perform only transmission / reception operations related to measurement of communication quality such as reception level, reception quality such as CQI, and throughput, and stop other operations. The circuit and processing related to the carrier and the communication method set to the power saving state perform only the reception operation related to the measurement of the communication quality such as the reception level and the reception quality, and stop the other operations. Thereby, power saving of the mobile communication terminal 10 is achieved. As described above, the throughput is not determined for the carrier and the communication method set in the power saving state.

  When the mobile communication terminal 10 is activated by a user's predetermined operation, the mobile communication terminal 10 communicates with the carrier and communication method set to the operating state, that is, Company A LTE in FIG. In the mobile communication terminal 10, when the communication quality in the carrier or communication method set to the operation state becomes less than a predetermined value (FIG. 3 (hereinafter the same) Yes in S1), the following operation is performed.

  The communication measurement unit 13 measures the communication quality such as the reception level, the reception quality such as CQI, and the throughput in the communication unit 11 for each of the carrier and communication method in the standby state and the power saving state, and inputs them to the priority table 12. (S2). Further, the remaining battery charge / charge calculator 14 calculates the remaining battery charge of the mobile communication terminal 10 or the communication charge that has already been generated, and inputs it to the priority table 12 (S3). FIG. 4 is a table showing an example of the priority table 12 in which these inputs are performed in FIG. In FIG. 4, the communication quality and throughput determination results are represented as high, medium, and low. In addition, about C company UTRA-TDD, since it is set to the power saving state, the determination of a throughput is not performed.

  Next, when there is a carrier or communication method having a predetermined communication quality or higher by the communication selection unit 15 based on the priority table 12 (Yes in S4), the use state of the carrier or communication method is reset as in the following example. (S5).

  As an example, when the remaining battery level is less than a predetermined value, for example, 50% (Yes in S5-11), the power consumption is set to the operating state among carriers and communication methods having a predetermined communication quality or higher. Reset the carrier or communication method lower than that of the existing carrier or communication method to the operating state. If there is no such carrier or communication system having a predetermined communication quality or higher, a carrier or communication system other than the one with the highest power consumption is reset to the operating state. However, when there is only one carrier or communication method with a predetermined communication quality or higher, it is reset to the operating state. Other carriers and communication systems are reset to the standby state and the power saving state in the order of good communication quality that can be compared or in the order of low power consumption (S5-12). When the remaining battery level is 50% or more (No in S5-11), the operation state, the standby state, and the power saving state are reset in the order in which the comparable communication quality is good (S5-13). In FIG. 4, since the remaining battery level is 30%, the LAN communication method is reset to the operating state, and the B company CDMA2000 is reset to the power saving state.

  As another example, when the communication charge that has been generated is a predetermined value, for example, 3,000 yen or more (Yes in S5-21), the communication charge is in an operating state among carriers and communication methods having a predetermined communication quality or higher. Reset the carrier or communication method lower than that of the carrier or communication method set to the operational state. If there is no such carrier or communication method with a predetermined communication quality or higher, the carrier or communication method other than the carrier or communication method with the highest communication charge is reset to the operating state. However, when there is only one carrier or communication method with a predetermined communication quality or higher, it is reset to the operating state. Other carriers and communication systems are reset to the standby state and the power saving state in the order in which the comparable communication quality is good or the communication charge is low (S5-22). When the communication fee is less than 3,000 yen (No in S5-21), the operation state, the standby state, and the power saving state are reset in the order in which the comparable communication quality is good (S5-23). In FIG. 4, since the communication charge that has already been generated is 5,000 yen, Company C UTRA-TDD is reset to the operating state and Company A LTE is reset to the power saving state.

  Further, for example, in the first example, when the remaining battery level is 50% or more, a carrier or communication method with a high throughput (a predetermined value or more) may be reset to an operating state. .

  In addition, the example of resetting is not limited to the above, but resetting is performed so that a combination of power consumption and communication charge or a lower one of the combination of power consumption and communication charge is selected from among carriers and communication methods having a predetermined communication quality or higher. Just do it. For example, the combination of the power consumption and the communication charge is ranked by a weighted average of both. However, if there is no carrier or communication method with a predetermined communication quality or higher (No in S4), no resetting is performed. Further, the resetting may be performed without depending on the remaining battery charge or the generated communication charge (without performing S3, S5-11 and S5-13, S5-21 and S5-23, etc.). Even in such a case, the resetting is performed by selecting a lower one of the combination of power consumption and communication charge or one of the carriers and communication methods having a predetermined communication quality or higher.

  Next, the communication selection unit 15 selects the carrier and communication method set to the operation state in the communication unit 11, and the communication unit 11 performs communication using the selected carrier and communication method (S6).

  In addition, when communication is not performed in the mobile communication terminal 10 or when communication activated by an application is performed, a carrier or communication method with high power consumption or communication fee is selected to reduce power consumption or communication fee. You may make it not.

  As described above, based on the communication quality for a plurality of communication methods, the remaining battery level of the mobile communication terminal, or the generated communication fee, the mobile communication terminal uses the power consumption or the carrier or communication method of a predetermined communication quality or higher. A carrier or communication method with a low communication charge is selected.

  Thereby, in the mobile communication terminal, it is possible to select a carrier and a communication method that have good communication quality and can reduce power consumption or communication charge.

  Next, a second embodiment of the present invention will be described with reference to the drawings.

  The communication terminal device according to the second embodiment of the present invention is a device that does not check the remaining battery level (specifically, the determination in S5-11) when power is supplied from an external power source. This is because when power is supplied, there is no need to worry about the remaining battery level. The specific configuration and operation will be described below.

  FIG. 5 is a diagram illustrating a configuration example of a communication network including the mobile communication terminal 30 in the present embodiment. As shown in FIG. 5, the mobile communication terminal 30 of the present embodiment includes a communication selection unit 35 instead of the communication selection unit 15. Although not shown, the mobile communication terminal 30 is connected to an external power source.

  FIG. 6 is a flowchart showing the operation of the mobile communication terminal 30 according to the second embodiment of the present invention.

  As illustrated in FIG. 6, the communication selection unit 35 determines whether power is supplied from an external power supply before S5-11 (S5-14).

  Specifically, the communication selection unit 35 determines whether or not a predetermined amount of power is input from the outside. Therefore, the communication selection unit 35 may include a power meter on a connection line with the external power source, and determine whether or not a predetermined amount of power is input by the power meter. The predetermined amount is set in the communication selection unit 35 by the user of the mobile communication terminal 30 of the present embodiment.

  When the power is supplied (Yes in S5-14), the communication selection unit 35 does not perform the confirmation of the remaining battery level and the process accompanying it, that is, the process of S5-11 to S5-13, and The process of S6 is performed. Note that the communication selection unit 35 may perform processes other than S5-11 to S5-13 (for example, processes of S5-21 to S5-23) before performing the process of S6. On the other hand, when the power is not supplied (No in S5-14), the communication selection unit 35 performs the processes of S5-11 to S5-13 in the same manner as the communication selection unit 15.

  As described above, when power is supplied from an external power source, the mobile communication terminal 30 according to the present embodiment performs confirmation of the remaining battery level and processing associated therewith (that is, processing in S5-11 to S5-13). Not performed. As a result, the mobile communication terminal 30 according to the present embodiment can reduce the amount of processing when power is supplied from an external power source, and can further save power.

  Furthermore, the communication selection part 35 may also perform the following operation | movement as one variation.

  That is, the communication selection unit 35 determines whether or not each determination process for performing resetting (for example, determination processes such as S5-11 and S5-21) is performed in advance by the user of the mobile communication terminal 30. You may implement based on information. The discrimination information includes information indicating the presence / absence of execution for each discrimination processing (for example, discrimination processing such as S5-11 and S5-21).

  As an example, as illustrated in FIG. 6, the communication selection unit 35, after S4, includes information indicating that the determination process of S5-24 (communication charge check process) is performed on the determination information (hereinafter referred to as “checking process of communication charge”). It may be determined whether or not “charge check presence information” is included (S5-24). The communication selection unit 35 performs the above-described process of S5-21 (communication charge check process) when the check information includes the charge check presence information (Yes in S5-24). If the fee check presence information is not included in the discrimination information (No in S5-24), the communication selection unit 35 does not perform the process of S5-21 (communication charge check process), and performs the next process. I do. The next process may be a process of determining whether or not the determination information includes information indicating that the determination process of S5-11 (a battery remaining amount check process) is performed. When the determination information includes information indicating that the determination process of S5-11 (battery remaining amount check process) is performed, the communication selection unit 35 performs the process of S5-11 (battery remaining amount check process). )I do. When not included, the communication selection unit 35 performs the following process without performing the process of S5-11 (the battery remaining amount check process). The next process may be the process of S6. Note that the communication selection unit 35 performs other determination processing on the determination information for other determination processing (for example, processing for determining whether the throughput is equal to or higher than a predetermined value) before performing the processing of S6. It may be determined whether or not the information shown is included. In a case where information indicating execution is included, the communication selection unit 35 may perform the other determination processing.

  Next, a third embodiment of the present invention will be described with reference to the drawings.

  FIG. 7 shows a configuration example of the communication terminal apparatus in the present embodiment.

  The communication terminal device 40 extracts, for each of at least one communication method, a communication method having a determined quality equal to or higher than a predetermined value for the communication. In addition, the communication terminal device 40 performs communication by selecting one of the extracted communication methods from the stored communication methods with low power consumption or communication charge.

  Based on the above configuration example, the operation of the communication terminal device 40 in the present embodiment will be described with reference to FIG.

  The communication terminal device 40 performs communication by a predetermined communication method by a predetermined operation of the user. When the communication quality in the communication method being used becomes less than a predetermined value, the communication terminal device 40 is a communication whose determined quality is equal to or higher than the predetermined value for each of at least one other communication method. Extract method. Next, the communication terminal device 40 selects one of the extracted communication methods from communication methods whose stored power consumption or communication charge is lower than that of the communication method used. If there is no such communication method among the extracted communication methods, one may be selected from those other than the communication method with the highest power consumption or communication charge. However, if there is only one extracted communication method, it is selected. The communication terminal device 40 performs communication using the selected communication method.

  As described above, the communication terminal device selects a communication method with low power consumption or communication charge among communication methods with a predetermined communication quality or higher.

  Thereby, in the mobile communication terminal, it is possible to select a carrier and a communication method that have good communication quality and can reduce power consumption or communication charge.

  The embodiment described above is not limited to the embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage.

Furthermore, a part or all of each of the above embodiments can be described as in the following supplementary notes, but is not limited thereto.
(Appendix 1)
If the communication quality of the communication method being used is less than the predetermined value, the communication quality determined for the communication is stored for each of at least one other communication method. A communication terminal device that selects one communication method whose power consumption or communication charge is lower than that of the communication method used and performs communication by the selected communication method.
(Appendix 2)
If there is no communication method in which the power consumption or communication fee is lower than that of the communication method being used, the communication method having the quality equal to or higher than a predetermined value other than the communication method having the highest power consumption or communication fee. If one is selected and there is one communication method greater than or equal to the predetermined value, a communication method greater than or equal to the predetermined value is selected.
The communication terminal device according to Supplementary Note 1, wherein
(Appendix 3)
A communication means for performing communication corresponding to each of a plurality of communication methods;
Communication determining means for determining communication quality in the communication means for each of the communication methods;
For each communication method, a memory unit to which an assumed power consumption or communication charge is input in advance and a determination result of the communication quality is input;
If the communication quality of the communication method being used is less than a predetermined value among the communication methods, communication for which the quality determination result is greater than or equal to the predetermined value for each of at least one other communication method. Among the communication methods, the power consumption or the communication fee is lower than that of the communication method used, and if there is no low communication method, the communication method other than the communication method with the highest power consumption or communication fee. The communication selection means for selecting the one communication method for execution of the communication when there is one communication method greater than or equal to the predetermined value. Communication terminal device.
(Appendix 4)
The selection of the communication method is performed based on comparing the calculated remaining battery charge of the own device or the generated communication charge with a predetermined value. Communication terminal device.
(Appendix 5)
The communication terminal according to any one of appendices 1 to 4, wherein for at least one of the communication methods, the circuit and the process perform only a transmission / reception operation or a reception operation related to the quality determination and stop other operations. apparatus.
(Appendix 6)
The comparison relating to the remaining battery level is performed only when power is not supplied from the outside.
The communication terminal device according to any one of appendices 4 to 5, characterized in that:
(Appendix 7)
When the communication quality of the communication method used in the communication terminal device is less than a predetermined value, the communication quality of the communication method for which the determined quality is greater than or equal to the predetermined value for each of at least one other communication method. A power consumption or a communication fee stored in the device is selected from communication methods lower than that of the communication method used, and communication is performed using the selected communication method. A method for controlling a communication terminal device.
(Appendix 8)
If there is no communication method in which the power consumption or communication fee is lower than that of the communication method being used, the communication method having the quality equal to or higher than a predetermined value other than the communication method having the highest power consumption or communication fee. If one is selected and there is one communication method greater than or equal to the predetermined value, a communication method greater than or equal to the predetermined value is selected.
The control method of the communication terminal device according to appendix 7, wherein
(Appendix 9)
9. The communication method according to any one of appendices 7 to 8, wherein the selection of the communication method is performed based on comparing the calculated battery remaining amount of the own device or the generated communication fee with a predetermined value. A method for controlling a communication terminal device.
(Appendix 10)
For at least one of the communication methods, the circuit and the process perform only a transmission / reception operation or a reception operation related to the quality determination, and stop the other operations. A communication terminal device control method according to claim 1.
(Appendix 11)
The comparison relating to the remaining battery level is performed only when power is not supplied from the outside.
The control method for a communication terminal device according to any one of appendices 9 to 10, characterized in that:
(Appendix 12)
The selection of the communication method is performed based on comparing the battery remaining amount, the communication fee, or the throughput with a predetermined value.
The control method for a communication terminal device according to any one of appendices 9 to 11, characterized in that:
(Appendix 13)
When the information indicating that the comparison related to the throughput is performed is included in predetermined information, the comparison related to the throughput is performed.
The method of controlling a communication terminal device according to appendix 12, characterized by:
(Appendix 14)
When the predetermined information includes information indicating that the comparison related to the communication fee is performed, the comparison related to the communication fee is performed.
14. The method for controlling a communication terminal apparatus according to any one of appendices 9 to 13, characterized in that:
(Appendix 15)
When the predetermined information includes information indicating that the comparison relating to the remaining battery level is performed, the comparison relating to the remaining battery level is performed.
The method for controlling a communication terminal device according to any one of appendices 9 to 14, characterized in that:
(Appendix 16)
A communication process for performing communication corresponding to each of a plurality of communication methods;
A communication determination step for determining communication quality in the communication step for each of the communication methods;
For each communication method, a memory step in which an assumed power consumption or communication fee is input in advance to the memory, and a determination result of the communication quality is input;
If the communication quality of the communication method being used is less than a predetermined value among the communication methods, communication for which the quality determination result is greater than or equal to the predetermined value for each of at least one other communication method. Among the communication methods, the power consumption or the communication fee is lower than that of the communication method used, and if there is no low communication method, the communication method other than the communication method with the highest power consumption or communication fee. And a communication selection step of selecting the one communication method for execution of the communication when there is one communication method greater than or equal to the predetermined value. The control method of the communication terminal device of any one of Claims.
(Appendix 17)
It further comprises a calculation step for calculating the battery level of the device itself or the communication charge that has already occurred,
In the memory step, the remaining battery level or the generated communication charge is further input,
The communication terminal device control method according to appendix 16, wherein the communication method is selected based on comparing the remaining battery charge or the generated communication charge with a predetermined value.
(Appendix 18)
It further comprises a calculation means for calculating the battery level of the device itself or the communication charge that has already occurred,
The memory means is further inputted with the remaining battery charge or the generated communication charge,
The communication terminal apparatus according to any one of appendices 3 to 6, wherein the communication method is selected based on comparing the remaining battery level or the generated communication fee with a predetermined value. .

  The present invention is applicable to a communication terminal apparatus and method.

DESCRIPTION OF SYMBOLS 10 Mobile communication terminal 20 Upper station 11 Communication part 12 Priority order table 13 Communication measurement part 14 Battery remaining charge / charge calculation part 15 Communication selection part 30 Mobile communication terminal 35 Communication selection part 40 Communication terminal apparatus

Claims (10)

  If the communication quality of the communication method being used is less than the predetermined value, the communication quality determined for the communication is stored for each of at least one other communication method. A communication terminal device that selects one communication method whose power consumption or communication charge is lower than that of the communication method used and performs communication by the selected communication method. If there is no communication method in which the power consumption or communication fee is lower than that of the communication method being used, the communication method having the quality equal to or higher than a predetermined value other than the communication method having the highest power consumption or communication fee. If one is selected and there is one communication method greater than or equal to the predetermined value, a communication method greater than or equal to the predetermined value is selected.
The communication terminal device according to claim 1. A communication means for performing communication corresponding to each of a plurality of communication methods;
Communication determining means for determining communication quality in the communication means for each of the communication methods;
For each communication method, a memory unit to which an assumed power consumption or communication charge is input in advance and a determination result of the communication quality is input;
If the communication quality of the communication method being used is less than a predetermined value among the communication methods, communication for which the quality determination result is greater than or equal to the predetermined value for each of at least one other communication method. Among the communication methods, the power consumption or the communication fee is lower than that of the communication method used, and if there is no low communication method, the communication method other than the communication method with the highest power consumption or communication fee. The communication selection means for selecting the one communication method for execution of the communication when there is one communication method equal to or greater than the predetermined value. Communication terminal device.   4. The method according to claim 1, wherein the communication method is selected based on comparing the calculated remaining battery level of the own device or the generated communication fee with a predetermined value. Communication terminal device.   5. The communication according to claim 1, wherein, for at least one of the communication methods, the circuit and processing perform only a transmission / reception operation or a reception operation related to the quality determination, and stop other operations. Terminal device. The comparison relating to the remaining battery level is performed only when power is not supplied from the outside.
The communication terminal device according to any one of claims 4 to 5, wherein   When the communication quality of the communication method used in the communication terminal device is less than a predetermined value, the communication quality of the communication method for which the determined quality is greater than or equal to the predetermined value for each of at least one other communication method. A power consumption or a communication fee stored in the device is selected from communication methods lower than that of the communication method used, and communication is performed using the selected communication method. A method for controlling a communication terminal device. If there is no communication method in which the power consumption or communication fee is lower than that of the communication method being used, the communication method having the quality equal to or higher than a predetermined value other than the communication method having the highest power consumption or communication fee. If one is selected and there is one communication method greater than or equal to the predetermined value, a communication method greater than or equal to the predetermined value is selected.
The communication terminal apparatus control method according to claim 7.   The selection of the communication method is performed based on comparing the calculated battery remaining amount of the own device or the generated communication fee with a predetermined value. Method for controlling the communication terminal apparatus of the present invention.   10. At least one of the communication methods, the circuit and processing perform only a transmission / reception operation or a reception operation related to the quality determination, and stop other operations. The communication terminal device control method according to the item.

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