JP2009153078A - Information communication terminal, information communication system, and control method and control program of information communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce stress of a user viewing data content and improve utilization efficiency of radio wave bands and power. <P>SOLUTION: A radio wave situation monitor part 16 monitors a radio wave situation. A read ahead determination condition storing part 17 stores a parameter that associates the radio wave situation and the degree of read ahead. A read ahead determining part 23 finds a parameter of the degree of read ahead in accordance with the current radio wave situation and determines the extent of read ahead to be performed based on the parameter. A content analyzing part 24 determines content to be preread based on the determination result by the read ahead determining part 23 and stores the preread content in a content storing part 18. Then, when an instruction to view the content is input by a user, the content is read and displayed if the content is already present. Otherwise, the content acquired via a radio communication is displayed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an information communication terminal, an information communication system, an information communication terminal control method, and a control program capable of acquiring data content and the like by wireless communication, such as a mobile phone terminal.

  Conventionally, various wireless systems have developed into their own methods, and a mobile phone system is known as a representative example of these wireless systems. In recent years, as mobile phone terminals used in mobile phone systems, those equipped with browser applications (programs) have become popular. In particular, recent mobile phone terminals are increasingly equipped with a display device capable of high-definition display, and as a result, more and more information is displayed on the high-definition display device by the browser application. Demand is growing.

  On the other hand, the radio wave band that can be used in a mobile phone system is limited, and it is often impossible to secure a sufficient communication band during data communication. In this case, a lot of information expected by users of each mobile phone terminal can be discomforted. It is difficult to display on the screen of the display device by a browser application.

  For this reason, in the past, by defining a browser application dedicated to mobile phone terminals, at the same time, by preparing a website that can efficiently supply data content for mobile phone terminal users even with a small communication capacity A device has been devised to reduce discomfort when the user browses the data content.

  In addition, in the published patent publication (Patent Document 1) of Japanese Patent Laid-Open No. 10-333965, in a vehicle-mounted information communication device that acquires hypertext, while a vehicle is traveling with low possibility of user operation, The hypertext is prefetched, the read page is stored in the buffer means, and then when the user instructs to read the page, the page stored in the buffer means is read, so that the page can be quickly read. A technique for enabling page reading is disclosed.

JP-A-10-333965 (FIG. 1)

  However, as the display device becomes higher definition and the number of display pixels increases as described above, the amount of data content dedicated to mobile phone terminals is also increasing, and recently, it has been viewed on a general personal computer. Mobile phone terminals equipped with browser applications (so-called full browsers) capable of displaying such data contents are also becoming widespread.

  In recent years, wireless communication technology adapted to radio wave conditions such as a so-called HSDPA (High Speed Downlink Packet Access) system is becoming widespread in order to aim to use an efficient radio wave band. Note that the HSDPA system is a system that is an extension of the WCDMA modulation system, and adopts an adaptive modulation technique that changes the modulation system in accordance with the state of radio waves (transmission path conditions). According to this HSDPA system, for example, the HSDPA system is used when the HSDPA system can be used, and the normal WCDMA system is used at other times. Things are switched and used every moment. Further, in a mobile phone terminal compatible with the HSDPA method, regardless of whether the modulation method is changed or the modulation parameter is changed, an ACLR (Adjacent Channel Leakage Ratio) characteristic is always obtained. In other words, the transmission power amplifier (power amplifier) is set so as to obtain an ACLR characteristic of a certain level or more in all cases. In other words, for example, an HSDPA mobile phone terminal can acquire data content in a short time in an environment where the radio wave condition is good, but it is difficult to acquire the data content in a short time in an environment where the radio wave condition is bad. There is a problem that power is consumed.

As described above, in recent years, the amount of information displayed in browser applications has been increasing, while the need to efficiently use a finite radio band has also increased at the same time. For example, when data communication is performed in an environment where the radio wave condition is bad, a lot of bandwidth is required and a lot of power is consumed. From the viewpoint of effective use of limited radio wave band and effective power use As a result, a problem of inefficiency occurs. That is, particularly in an environment where the radio wave condition is bad, it takes a lot of time to acquire the data content, so that the user's stress increases, and there is a problem that the radio wave band and power use efficiency are lowered.
The present invention has been proposed in view of such circumstances, and for example, it is possible to reduce user stress when browsing data content by a browser application, and to improve utilization efficiency of a radio wave band and power. Information communication terminal, information communication system, control method and control program for information communication terminal

  The information communication terminal of the present invention has a display unit for displaying information, a wireless communication unit for performing wireless communication, a radio wave state monitoring unit for monitoring a radio wave state during wireless communication, and an instruction from a user. A user instruction input unit, a setting value storage unit that stores at least a plurality of radio wave conditions and a plurality of information read-ahead levels, and information corresponding to the radio wave condition currently being monitored from these setting values A prefetch control unit that controls the prefetching of information through the wireless communication unit at the determined information prefetching level, an information storage unit that stores the prefetched information, and a user that displays information When the display instruction is input, if the display instruction information is already stored, the stored information is read and displayed on the display unit, and the display instruction information is stored. If not even by having a control unit for displaying on the display unit the information obtained through the wireless communication unit, to solve the problems described above.

  In addition, the information communication system of the present invention determines the transmission power and communication band during wireless communication with the information communication terminal and the data amount permitting prefetching, and the transmission power, communication band and data amount permitting prefetching. A wireless communication base station that sets a dedicated communication channel that uses a communication band and information that indicates the transmission power and communication band of the wireless communication and the amount of data that is prefetched from the wireless communication base station Information, and using the transmission power and the dedicated communication channel, information for the amount of data for which prefetching is permitted is prefetched and stored with the information prefetching degree according to the radio wave status at the time of wireless communication, When the information input instruction is input from the user, if the information instructed to display is already stored, the stored information is read and displayed, and the display instruction is displayed. If the information is not saved by having the information communication terminal to display the acquired information through a wireless communication, to solve the problems described above.

  The control method of the information communication terminal according to the present invention includes a step of monitoring a radio wave condition during wireless communication, and a setting value associated with at least a plurality of radio wave conditions and a plurality of information prefetching levels, A step of determining information prefetching according to radio wave conditions, controlling prefetching of information by wireless communication with the determined information prefetching, storing information prefetched through wireless communication, and displaying information from the user When the instruction for display is input, if the information instructed to be displayed has been stored, the stored information is read and displayed. If the information instructed to display is not stored, it is acquired through wireless communication. The above-described problem is solved by including the step of displaying the information.

  In addition, the control program for the information communication terminal of the present invention includes a radio wave status monitoring unit that monitors a radio wave status at the time of wireless communication, and a setting value that associates at least a plurality of radio wave statuses and a plurality of information prefetch levels, respectively, Determines the information read-ahead level according to the radio wave condition being monitored, and stores and controls the pre-read control unit that controls the read-ahead acquisition of information through wireless communication based on the determined information read-ahead level, and the information read and acquired through wireless communication When an instruction to display information is input from the information storage control unit and the user, if the information instructed to display is already stored, the stored information is read out and displayed on the display unit. When the information instructed to be displayed is not stored, the information communication terminal is operated as a control unit that displays the information acquired through the wireless communication unit on the display unit. It allows to solve the problems described above.

  That is, according to the present invention, the radio wave status and the information prefetching degree are associated with each other, and when information prefetching is performed, the information prefetching degree is determined according to the radio wave situation of wireless communication, and the information prefetching is based on the information prefetching degree. Save the prefetched information. When an instruction to display information is input from the user, if the information has been stored, the stored information is read out and displayed. On the other hand, if the information is not stored, the information acquired through wireless communication is displayed. I will let you.

  In the present invention, information such as data content is pre-read and saved according to the radio wave condition, and when the user instructs to browse the data content, the data content is saved if it has been saved. Data content is read out and displayed. On the other hand, data content acquired through wireless communication is displayed when it is not stored, so until the content is actually displayed when the user gives a content browsing instruction As a result, it is possible to reduce the stress applied to the user, and it is also possible to improve the use efficiency of the radio wave band and power.

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

  In the following embodiments, a mobile phone terminal is cited as an application example of the present invention. Of course, the content described here is merely an example, and it goes without saying that the present invention is not limited to this example.

[Outline of Embodiment of the Present Invention]
In the embodiment of the present invention, a browser application that dynamically switches the data content acquisition method according to the radio wave condition (communication quality) is defined.

  The browser application in the embodiment of the present invention has a function of prefetching as much information (data content) as possible even when the radio wave condition (communication quality) is good. Specifically, the browser application in the embodiment of the present invention acquires in advance and stores it in the buffer of the mobile phone terminal regardless of whether the user selects the data content of the link destination.

  In addition, as a use case for prefetching with the browser application of this embodiment, a case of prefetching a linked page or site included in the content last displayed when browsing the site last time, or a mobile phone terminal For example, a case where a desired portal site or an acquaintance's web log (so-called blog) is prefetched every day is conceivable. In the case of prefetching the link destination at the time of browsing the site the previous time, the browser application of this embodiment prefetches data content such as the linked page or site when the radio wave condition (communication quality) is good. And save it in the buffer. In addition, in the case where the desired portal site or acquaintance's blog is prefetched every day, for example, the browser application of this embodiment uses the history of the sites and pages checked every day to check the radio wave condition (communication quality). ) Is good, for example, data contents such as those sites and pages are prefetched periodically and stored in a buffer. Further, in a case where a desired portal site or an acquaintance's blog is checked every day, for example, when a site that the user wants to check every day is registered in the “favorite list” in advance, the browser application of this embodiment is When the radio wave condition (communication quality) is good, for example, data contents such as sites in the favorites list are prefetched periodically and stored in a buffer.

  In the browser application according to the embodiment of the present invention, for example, when the radio wave condition (communication quality) is poor, when the user instructs display of the data content of the link destination, the above-described browser application does not newly perform wireless communication. As described above, when the radio wave condition (communication quality) is good, the data content prefetched and stored in the buffer of the mobile phone terminal is read and displayed.

  In addition, the browser application according to the present embodiment can set in advance how much prefetching is performed, that is, the degree of prefetching, according to the radio wave condition (that is, communication quality and communication environment) when prefetching the data content and the like. ing.

  Here, parameters for defining the degree of prefetching include the number of stages and pages of the prefetched link, the data size of the prefetched content, the buffer capacity of the mobile phone device that stores the prefetched data, and the site or page in the prefetched link. , Parameters such as priority order set in advance for the data content can be listed. In other words, for example, when the number of link stages and the number of pages to be prefetched are set, the number of stages and the number of pages are prefetched. When the data size of the content is set, the prefetching is performed until the data size is reached. In addition, prefetching is performed for the amount of data corresponding to the buffer capacity of the mobile phone terminal, and when priority is set, prefetching is performed in order from the page with the highest priority. In particular, when priority is set, for example, when there is a site that is checked daily, the higher the priority is, the quicker the check can be made. A detailed usage example of the parameters defining the prefetching degree will be described later.

  On the other hand, the parameters defining the radio wave conditions include, for example, parameters represented by binary values of radio wave intensity “strong” and radio wave intensity “weak”, for example, radio wave intensity “strong”, radio wave intensity “medium”, Three values such as “weak”, radio wave intensity “strong 1”, radio wave intensity “strong 2”, radio wave intensity “medium 1”, radio wave intensity “medium 2”, radio wave intensity “weak 1”, radio wave intensity “weak 2” ”Can be cited as a parameter having three or more values. Further, as a parameter that defines the radio wave condition, not only the radio wave intensity as described above but also an index indicating the wireless communication quality in the mobile phone terminal such as a block error rate and a bit error rate can be used. An index that associates the communication quality with the transmission power can also be used. A detailed usage example of the parameters defining these radio wave conditions will be described later.

  That is, in the case of the present embodiment, for each parameter representing the radio wave condition, communication quality, etc., the number of prefetched link stages and the number of pages, the data size of the prefetched content, the priority order of the sites in the prefetched link, etc. The parameters can be set individually.

  Note that the above-described parameters regarding the degree of prefetching, the radio wave condition, and the like may be set by the user or may be set in advance as initial values in the mobile phone terminal. Each parameter that defines the degree of prefetching is dynamic depending on the radio wave condition etc., whether it is already set by the user or is already set as an initial value in the mobile phone terminal in advance. It may be changed to.

  In addition, the browser application of the present embodiment, for example, when a mobile phone terminal is compatible with a plurality of wireless communication systems, has a good radio wave condition in the plurality of communication systems and can perform data transfer at a higher speed. A function for selectively switching the system may be provided. Even if the browser application of the present embodiment is a communication system capable of high-speed data communication, for example, when an expensive communication fee is required, the system capable of high-speed communication is not necessarily selected. A low-cost communication system may be used.

  According to the browser application of the present embodiment, each of the above-described settings, that is, the communication system and its strength, the read-ahead degree, the switching of a plurality of communication systems, the selection of the communication system according to the data transfer rate, etc. It can be set to.

  As described above, in the mobile phone terminal according to the present embodiment, the acquisition of data content and the amount of data acquisition can be dynamically controlled in accordance with the radio wave condition. Reduction and effective utilization of a finite radio wave band are possible, which is very efficient and can realize high convenience.

[Schematic configuration of information communication system]
FIG. 1 shows a schematic configuration of an information communication system according to an embodiment of the present invention. FIG. 1 shows only main components necessary for explaining the information communication system of the embodiment of the present invention.

  In FIG. 1, a user's mobile phone terminal 5 can be connected to the Internet 2 through a base station 4 and an exchange 3 of the mobile phone network. Further, the mobile phone terminal 5 can access the content server 1 via the Internet 2. The mobile phone terminal 5 can acquire data content that can be displayed on the screen of the display device from the content server 1 by the browser application of this embodiment.

  Although FIG. 1 shows only one server as the content server 1, the actual content server 1 stores data contents of a plurality of sites registered in the “favorite list” of the mobile phone terminal 5, for example. A plurality of content servers.

[Schematic configuration of mobile phone terminal]
FIG. 2 shows a schematic configuration of the mobile phone terminal according to the embodiment of the present invention. FIG. 2 shows only main components necessary for the description of the mobile phone terminal according to the embodiment of the present invention.

  2 includes, as main components, a content control unit 10, an input control unit 11 including a user instruction input unit of the present invention, a display unit 12, a timer 13, a GPS unit 14, and a wireless communication unit of the present invention. Including a data communication control unit 15 and a radio control unit 19, a radio wave condition monitoring unit 16, a prefetch determination condition storage unit 17 corresponding to the setting value storage unit of the present invention, and a content storage unit 18 corresponding to the information storage unit of the present invention. Have.

  The wireless control unit 19 includes a wireless communication device that supports a single communication system or a plurality of communication systems, and a control circuit that controls the wireless communication device.

  The data communication control unit 15 performs TCP / IP control for a communication protocol for wireless communication and a communication protocol associated with execution of a browser application (program).

  The wireless control unit 19 and the data communication control unit 15 also perform control related to wireless communication using a pre-read-only communication channel, which will be described later.

  In the mobile phone terminal of the present embodiment, the wireless control unit 19 communicates with the base station 4 of the mobile phone network, and further connects to the content server 1 via the exchange 3 and the Internet 2, and the data communication control unit 15 By performing TCP / IP communication, data content can be acquired from the content server 1.

  The radio wave condition monitoring unit 16 monitors the radio wave condition when wireless communication is performed with the base station 4. More specifically, the radio wave condition monitoring unit 16 acquires and monitors an index indicating the wireless communication quality in the mobile phone terminal, such as the radio wave intensity, the block error rate, and the bit error rate, thereby obtaining the current radio wave condition. Detect how it is. In addition, as an index indicating the wireless communication quality in the mobile phone network, for example, information sent from the base station 4, for example, the distance between the base station and the mobile phone terminal, the base station 4 The number of users accommodated per band can also be used. Whether the radio wave status monitoring unit 16 uses any one of the indices indicating the radio communication quality such as the radio wave intensity, the block error rate, the bit error rate, the distance to the base station, the number of users accommodated per band, etc. Alternatively, the current radio wave condition is judged by using a combination of at least two. Then, the radio wave status monitoring unit 16 sends information representing the radio wave status obtained by the monitoring to the content control unit 10.

  The content control unit 10 performs various operations and controls for executing the browser application (program) of the present embodiment, storing the data content, displaying the data content, and the like accompanying the execution of the application.

  The input control unit 11 detects a user operation through various keys and the like mounted on the mobile phone terminal, and sends the user operation signal to the content control unit 10. Examples of the user operation in the present embodiment include a display instruction for browsing data contents, a link destination designation, a page designation, and the like.

  The display unit 12 includes, for example, a display device such as a liquid crystal or an organic EL and a display control circuit that controls the display device, and content and the like are displayed on the screen of the display device by the browser application of the present embodiment. Is done.

  As described above, the prefetch determination condition storage unit 17 stores setting information about prefetch determination conditions such as a parameter that defines the degree of prefetching and a parameter that defines the radio wave condition when performing the prefetching. ing. In the prefetch determination condition storage unit 17, addresses (URLs) of sites that the user wants to check every day such as a desired portal site or an acquaintance's blog are registered as a “favorite list”.

  The content storage unit 18 stores data content prefetched by execution of the browser application of the present embodiment. The content storage unit 18 can also store data content cached by the browser application.

  The timer unit 13 measures date and time. In the present embodiment, the time information of the timer unit 13 is used, for example, for determining the prefetch execution time when the data content is set to be prefetched periodically.

  A GPS (Global Positioning System) unit 14 measures the current position of the mobile phone terminal according to the present embodiment. In the present embodiment, the current position information of the GPS unit 14 can be used for detecting the prefetching execution location, for example, when the position where the prefetching is performed is determined. The prefetch execution location may be, for example, a location determined in advance by the user, a location determined as an initial value for the mobile phone terminal, or a location acquired by learning, for example. Examples of the place acquired by learning include a place where the radio wave condition monitoring unit 16 always determines that the radio wave condition is always good on a route frequently used by the user, such as a commute route or a commute route. That is, in this case, the mobile phone terminal of the present embodiment has a place where the radio wave condition monitored by the radio wave condition monitoring unit 16 is good, for example, on a certain period on a route frequently used by the user such as a commute route or a school route. When it is repeatedly detected, it has a learning function that learns a place where the radio wave condition is good as a place suitable for prefetching. When the mobile phone terminal determines from the positioning information of the GPS unit 14 that it has come to the place obtained by the learning, the mobile phone terminal performs prefetching. Thereby, efficient prefetching becomes possible. In addition to the position information by the GPS unit 14, the position information uses the position information of the base station in which the mobile phone terminal of the present embodiment is located in the area (that is, the position information specified by the base station number). You may do it.

  In the mobile phone terminal of the present embodiment, the content control unit 10 includes, as main components, a request display unit 21, a display control unit 22, a prefetch determination corresponding to the prefetch control unit and the information storage control unit of the present invention. A section 23 and a content analysis section 24. Note that the function of each main component of the content control unit 10 is realized by, for example, the CPU executing the browser application (program) of the present embodiment.

  For example, when the prefetch determination unit 23 prefetches the link destination of the previously displayed site or the site of the “favorite list” registered in the prefetch determination condition storage unit 17, the prefetch determination condition storage unit 17. Whether or not to prefetch the data contents of those sites is determined based on the parameters stored in the above and the radio wave status monitoring information by the radio wave status monitoring unit 16. That is, the prefetch determination unit 23 recognizes the current radio wave status from the radio wave status monitoring information by the radio wave status monitoring unit 16 and can perform wireless communication for prefetching from the radio wave status. And how much data content of each site is prefetched (that is, the degree of prefetching) is determined according to the radio wave condition. In the present embodiment, the prefetch determination unit 23 can also make a determination regarding learning of a place where the radio wave condition is good and execution of prefetching based on the learning information.

  The content analysis unit 24 determines a site and content to be prefetched based on the above-described parameters stored in the prefetch determination condition storage unit 17 and the memory capacity of the content storage unit 18. That is, the content analysis unit 24 responds to the number of link stages and pages in the prefetched site, the data size of the prefetched content, the remaining memory capacity of the content storage unit 18, the priority set for the prefetched site, and the like. Thus, it is determined which site data content is prefetched.

  The request control unit 21 generates information for requesting the content server 1 for the data content of the site determined to be prefetched by the content analysis unit 24. The data content request information in this case is transmitted to the base station 4 in FIG. 1 via the data communication control unit 15 and the radio control unit 19, and further transmitted to the content server 1 via the exchange 3 and the Internet 2. When the user operation information is supplied from the input control unit 11 and the user operation information is information for instructing acquisition of data content, the request control unit 21 selects the data content instructed by the user operation information. The content server 1 is also requested.

  When the data content is transmitted from the content server 1 in response to the request from the request control unit 21 and the data content is received via the wireless control unit 19 and the data communication control unit 15, the content analysis unit 24 The received data content is stored in the content storage unit 18.

  Further, when user operation information is supplied from the input control unit 11 and the user operation information is information for instructing display of data content, the content analysis unit 24 has already received the data content instructed by the user operation information. It is analyzed whether or not it is stored in the content storage unit 18 by prefetching.

  When the data content instructed to be displayed by the user is stored in the content storage unit 18, the content analysis unit 24 reads the data content from the content storage unit 18 and passes it to the display control unit 22. The display control unit 22 performs a process necessary for displaying the data content on the display device of the display unit 12 and transfers display data generated by the process to the display unit 12. As a result, the data content pre-read and stored in the content storage unit 18 is displayed on the screen of the display device.

  On the other hand, when the data content instructed to be displayed by the user is not stored in the content storage unit 18, the content analysis unit 24 requests the request control unit 21 to acquire the data content. Thereby, the request control unit 21 generates information for requesting the data server 1 for the data content. When the data content is transmitted from the content server 1 in response to the request from the request control unit 21 and the data content is received via the wireless control unit 19 and the data communication control unit 15, the display control unit 22 Then, processing necessary to display the data content on the display device of the display unit 12 is performed, and display data generated by the processing is transferred to the display unit 12. Thereby, the data content acquired from the content server 1 is displayed on the screen of the display device.

  Note that, for example, when a display instruction for data content is given by the user, the data content stored in the content storage unit 18 is read out when the data content is stored in the content storage unit 128 and the radio wave condition is It may be performed only when the current radio wave condition being monitored by the monitoring unit 16 is poor.

[Parameter example for prefetch judgment condition]
In FIG. 3, the parameters stored in the prefetch determination condition storage unit 17 referred to by the prefetch determination unit 23 to determine whether prefetching is possible according to the radio wave condition and to grasp the amount of data to be prefetched. An example of (setting value) is shown.

  When the mobile phone terminal according to the present embodiment is compatible with a plurality of wireless communication systems, the prefetch determination condition storage unit 17 includes, for each wireless communication system, parameters that define, for example, a radio wave condition as shown in FIG. And a parameter defining the degree of prefetching are set and registered in association with each other.

  FIG. 3 lists HSDPA and GSM (Global System for Mobile Communications) as an example of a plurality of wireless communication systems. Further, in FIG. 3, an effective communication speed with respect to the upper limit of the maximum data transfer amount of the wireless communication band given by each wireless communication system is set as a parameter defining the radio wave condition (that is, communication quality). An example is given in which the maximum prefetchable capacity and the number of links are set as parameters defining the degree. In the example of FIG. 3, the upper limit of the maximum data transfer amount of the wireless communication band given by the wireless communication system is, for example, 100 kbps, and data transfer of, for example, 70 kbps is possible with respect to the upper limit of the maximum data transfer amount. In some cases, the communication quality is expressed as 70%. In the example of FIG. 3, how much content is prefetched for each communication quality is defined by the maximum prefetch capacity and the maximum number of prefetch links. Also, a case where no prefetching is performed in the first place, such as “N / A” in FIG. In the present embodiment, a combination of at least two of these indexes is used for determining communication quality. For communication quality, as described above, other indexes indicating the wireless communication quality of mobile phones such as radio wave intensity, block error rate, bit error rate, distance to base station, number of users accommodated per band, etc. are used. May be. In the case of the present embodiment, specifically, the base station determines the communication quality using these indices and sends the communication quality information to the mobile phone terminal. Of course, the communication is performed on the mobile phone terminal side. You may judge quality.

  The specific example of FIG. 3 will be described in more detail. In the prefetch determination condition storage unit 17, for example, a value indicating communication quality “70% or more” is set as a parameter that defines the radio wave condition of the communication system “HSDPA”. In addition, as a parameter that defines the degree of prefetching, a value of the maximum prefetching capacity “100 KB” and a value of the maximum number of prefetching links “10 links” are set. The prefetch determination condition storage unit 17 is set with a value of communication quality “30 to 70%” as a parameter that defines the radio wave condition of the communication system “HSDPA”, and the maximum prefetch as a parameter that defines the degree of prefetching. A value of the reading capacity “10 KB” and a value of the maximum number of prefetched links “3 links” are set. The prefetch determination condition storage unit 17 is set with a value of communication quality “less than 30%” as a parameter that defines the radio wave condition of the communication system “HSDPA”, and the maximum prefetch as a parameter that defines the degree of prefetching. A value of capacity “N / A” and a value of maximum prefetch link number “N / A” are set. Further, in the prefetch determination condition storage unit 17, for example, a value of communication quality “70% or more” is set as a parameter that defines the radio wave condition of the communication system “GSM”, and the maximum prefetch as a parameter that defines the degree of prefetching. A value of the reading capacity “10 KB” and a value of the maximum number of prefetched links “3 links” are set. The prefetch determination condition storage unit 17 is set with a value of communication quality “less than 70%” as a parameter that defines the radio wave condition of the communication system “GSM”, and a maximum prefetch as a parameter that defines the degree of prefetching. A value of capacity “N / A” and a value of maximum prefetch link number “N / A” are set.

  Therefore, in the case of the example in FIG. 3, when “HSDPA” is used as the communication system, if the radio wave condition monitoring unit 16 detects that the communication quality is “70% or more”, The prefetch determination unit 23 determines that the data can be prefetched up to the number of links within the maximum prefetch capacity “100 KB” and the number of links within the maximum prefetch link number “10 links”. Further, when “HSDPA” is used as the communication system, if the radio wave condition monitoring unit 16 detects that the communication quality is “30 to 70%”, the prefetch determination unit 23 It is determined that the data can be prefetched up to the number of links within the maximum prefetch capacity “10 KB” and the number of links within the maximum prefetch link number “3 links”. In addition, when “HSDPA” is used as the communication system, if the radio wave condition monitoring unit 16 detects that the communication quality is “less than 30%”, the prefetch determination unit 23 It is determined that data prefetching is not performed based on the maximum prefetch capacity “N / A” and the maximum prefetch link number “N / A”. On the other hand, when “GSM” is used as the communication system, if the radio wave condition monitoring unit 16 detects that the communication quality is “70% or higher”, the prefetch determination unit 23 It is determined that the data can be prefetched up to the number of links within the maximum prefetch capacity “10 KB” and the number of links within the maximum prefetch link number “3 links”. Further, when “GSM” is used as the communication system, if the radio wave condition monitoring unit 16 detects that the communication quality is “less than 70%”, the prefetch determination unit 23 It is determined that data prefetching is not performed based on the maximum prefetch capacity “N / A” and the maximum prefetch link number “N / A”.

  In this embodiment, an example is given in which the maximum prefetch capacity is specified and data content within the capacity is prefetched. For example, the type of data content to be prefetched is recognized (for example, an extension is viewed) Whether to perform prefetching may be determined according to the recognition result of the content type. As a result, for example, when the data content has a very large amount of data such as moving image content or still image content due to the extension of the data content to be prefetched, it is possible to control such that prefetching is not performed. Become. Conversely, files with extensions such as HTML and TXT may be preferentially acquired.

[Example of definition of transmission power and communication quality on the mobile phone terminal]
In the present embodiment, for example, when the target “Eb / Io” can be satisfied even if the transmission power is low, the communication quality is defined as good. If the transmission power is not increased, the target “Eb / Io” is defined. It is also possible to define that the communication quality is poor when the above is not satisfied. Note that “Eb / Io” is an index for satisfying the required quality, and the ratio between the received power (Eb) required per bit after error correction and the interference power (Io) per unit type band ( Eb / Io).

  That is, in this example, the transmission power is a parameter depending on the communication system. For example, as shown in FIG. 4, a communication system in which the maximum transmission power is “0 dBm” and the minimum transmission power is “−100 dBm”. Assuming that, for example, when the target transmission rate “−100 dBm” can satisfy the target “Eb / Io”, the communication quality is set to “100%”. For example, the transmission power is set to “−80 dBm”. When “Eb / Io” can be satisfied, the communication quality is set to “80%”. Conversely, for example, when the maximum transmission power “0 dBm” cannot satisfy the target “Eb / Io”, the communication quality is set. Is “0%”.

  However, the target “Eb / Io” varies depending on conditions such as a given communication method, bandwidth, bit rate, error correction method, and the like. Therefore, for example, a table may be defined for each target “Eb / Io” of each condition such as the communication method, the bandwidth, the bit rate, and the error correction method. FIG. 4 is an example in which transmission power and communication quality are defined on the assumption that these conditions are simply the same.

[Definition example of transmission power, communication quality and prefetchable capacity on the base station side]
The above-described example of FIG. 4 shows the definition of transmission power and communication quality on the mobile phone terminal side. For example, as shown in FIG. It is also possible to define a readable capacity and allow the mobile phone terminal to pre-read only in a communication band that can be secured with a small transmission power. Note that the definitions of transmission power and communication quality in FIG. 5 are the same as in the example of FIG. 4, and in the example of FIG. 5, a prefetchable capacity is further defined.

  That is, on the base station side, with reference to the table in FIG. 5, when transmission can be performed with less power, the mobile phone terminal pre-reads within a certain time (for example, within 1000 ms) from a predetermined start time. A good data capacity is specified, and the specified data capacity is notified to the mobile phone terminal.

  In addition, when the predetermined time has elapsed, the base station performs again the process of determining the data capacity that the mobile phone terminal can prefetch within the next specified time (fixed time). Note that the limit on the amount of data that can be prefetched by the mobile phone terminal is, for example, when a communication channel dedicated to prefetching is defined and a certain amount of data (data with a prescribed data capacity) is detected through the dedicated communication channel. This can be realized by closing the dedicated communication channel on the base station side. That is, according to this example, it is possible to impose restrictions on the data capacity unilaterally from the base station side.

  In the present embodiment, the predetermined start time that defines a certain time on the base station side is the time when a mobile phone terminal that desires prefetching requests the base station to open the dedicated communication channel. And The base station uses the trigger (predetermined start time) to receive the dedicated communication channel open request from the mobile phone terminal, calculates the prefetchable data capacity within the predetermined time, and opens the dedicated communication channel. .

  As described above, when the base station determines the prefetchable data capacity within a predetermined time and further opens the dedicated communication channel, the mobile phone terminal performs prefetching as much as possible within the range of the data capacity. It becomes possible.

  Note that the mobile phone terminal may take measures such as preferentially acquiring a file with an extension such as HTML or TXT in order to efficiently prefetch in the limited communication capacity.

[Prefetch processing based on favorites list]
Next, FIG. 6 is referred to when the prefetch determination unit 23 determines a site to be prefetched, determines which site is prefetched preferentially, and determines the number of links to be prefetched and the amount of data. An example of the relationship between the “favorite list” stored in the prefetch determination condition storage unit 17 and parameters (setting values) is shown.

  FIG. 6 shows, as an example of the “favorite list” stored in the prefetch determination condition storage unit 17, a site whose registered name is “Weekly Weather Forecast” and its URL, and a site whose registered name is “Today's Stock Price Information”. In addition, the URL, the site with the registered name “News Bulletin”, and an example in which the URL is registered are given. In the example of FIG. 6, the priority of the site of “Weekly Weather Forecast” is “1st”, the priority of the site of “Stock Information of Today” is “2nd”, and the priority of the site of “Breaking News” Is set to “3rd place”. The prefetch determination condition storage unit 17 then sets the value of the maximum prefetch capacity “50 KB” and the maximum number of prefetch links as parameters defining the degree of prefetch for the “weekly weather forecast” site with the priority “first place”. A value of “10 links” is set. Similarly, the prefetch determination condition storage unit 17 sets the value of the maximum prefetch capacity “20 KB” and the maximum prefetch link as parameters for defining the prefetch degree for the site of “today's stock price information” with the priority “second place”. The value of the number “5 links” is set, and the value of the maximum prefetch capacity “10 KB” and the maximum number of prefetch links are set as parameters defining the degree of prefetch for the “new news” site of the priority “third place”. A value of “3 links” is set.

  Therefore, in the example of FIG. 6, when the communication quality detected by the radio wave condition monitoring unit 16 is very good, the prefetch determination unit 23 first selects the “weekly weather” having a priority of “1st place”. Prefetch from the site of “Forecast” with maximum read-ahead capacity of “50KB” and “10 links”, and then from the site of “stock price information of the day” with the priority of “second place”, the maximum read-ahead capacity of “20 KB” , “5 links” is pre-read, and then the pre-read for the maximum pre-read capacity “10 KB” and “3 links” is performed from the “new news bulletin” site with the priority “3rd”. Further, for example, when the communication quality detected by the radio wave condition monitoring unit 16 is medium, the prefetch determination unit 23 determines the maximum from the site of the “weekly weather forecast” having a priority of “1st place”, for example. Prefetch capacity “50KB” and “10 links” are prefetched, and then from the above-mentioned “today's stock price information” site with the priority “second place”, the maximum prefetch capacity “20 KB” and the maximum prefetch link The number of “5 links” is pre-read, but for example, the pre-reading is not performed for the “new news bulletin” site with the priority “3rd”. Further, for example, when the communication quality detected by the radio wave condition monitoring unit 16 is poor, the prefetch determination unit 23 may, for example, select the “weekly weather forecast” site having the priority “1st”. Pre-fetch capacity of “50KB” and “10 links”, but the site of the “stock price information” with the priority priority “2nd” and the “breaking news” with the priority “3rd” Do not pre-read about sites.

  In the above description, the maximum prefetch capacity and the maximum number of prefetch links registered in the prefetch determination condition storage unit 17 are prefetched, but the communication quality detected by the radio wave condition monitoring unit 16 Depending on, the maximum prefetch capacity and the maximum number of prefetch links may be changed.

  In the example of FIG. 6, an example is given in which priority is set for each site. For example, priority is further set for each link destination or page in the same site, and each priority in the same site is set. It is also possible to perform prefetch processing for links and pages in descending order of priority.

  In the description of FIG. 6, when the communication quality is poor, an example is given in which only the sites with higher priority are prefetched. However, for the top page of each site registered in the “favorite list”, the communication quality is improved. You may make it look ahead without failing. In this way, when prefetching the top page of each site, the mobile phone terminal determines the number of links existing in the top page of each site, what data contents are prepared, and what updates are made. You will be able to get information such as. Of course, after the pre-reading of the top page is completed, the mobile phone terminal determines the extent of pre-reading according to the communication quality, priority, etc., as described above.

  Further, in the description of FIG. 6, illustration of the communication system and the specific example of the communication quality as in the example of FIG. 3 is omitted, but actually, in the example of FIG. 6 as well as in the case of FIG. Specific values are set for the communication system and communication quality.

  The prefetch processing of the “favorite list” by the prefetch determination unit 23 as described above is executed at a timer time preset in the prefetch determination condition storage unit 17 (for example, a predetermined time such as every day in the morning or afternoon). The content acquired by the prefetching is stored in the content storage unit 18. Note that the content stored in the content storage unit 18 is sequentially deleted when a preset storage period elapses. For example, the contents may be erased in order from the oldest storage period, or may be performed in order from the lowest priority, for example, by combining the storage period and the priority. .

[Processing flow of content control unit of mobile phone terminal]
FIG. 7 shows a flowchart of a prefetch process executed by the content control unit 10 in FIG. 2 based on the communication quality and the prefetch condition definition as described above. Note that the processing in the flowchart of FIG. 7 is realized by the CPU executing the browser application program according to the embodiment of the present invention.

  In FIG. 7, when the browser application program of the present embodiment is activated and the function of the content control unit 10 is activated by the CPU, the prefetch determination unit 23 of the content control unit 10 performs the prefetch determination condition as the process of step S1. The setting values (each parameter, etc.) of the above-described prefetch conditions set in advance in the storage unit 17 are read. Note that the prefetching condition may be set while the browser application is running.

  Next, the prefetch determination unit 23 determines whether or not a predetermined time has passed since the previously executed prefetch process, that is, for example, when the content is set to be prefetched periodically as the process of step S2. It is determined whether or not the read-ahead execution time is reached. If it is determined in step S2 that the predetermined time has elapsed, the prefetch determination unit 23 advances the process to step S3. In the present embodiment, it is possible to prevent the prefetching from being repeatedly executed, for example, when the radio wave condition is always good by performing the determination of the elapse of a certain time in step S2.

  When the processing proceeds to step S3, the prefetch determination unit 23 determines each parameter of the prefetch condition read from the prefetch determination condition storage unit 17 in step S1 and the radio wave status (communication quality, etc.) acquired from the radio wave status monitoring unit 16. ) And whether or not prefetching is performed as described above and whether or not prefetching is possible is determined from the radio wave status.

  If it is determined in step S3 that prefetching is necessary and possible, the content control unit 10 advances the process to step S10. On the other hand, if it is determined that prefetching is unnecessary or cannot be prefetched, step S4 is performed. Proceed to the process.

  When the processing proceeds to step S10, the content analysis unit 24 of the content control unit 10 checks the link destination page or site obtained by analyzing the last displayed content when browsing the previous site or the like, or checks daily. The site or page obtained by analyzing the history of the site or page to be registered, or the registered site or page obtained by analyzing the “favorite list” is specified.

  Next, in step S11, the request control unit 21 of the content control unit 10 requests the content server 1 to request the data content of the site or page specified by the content analysis unit 24. And the data content request information is transmitted via the data communication control unit 15 and the wireless control unit 19.

  Then, when the desired data content is transmitted from the content server 1 and the data content is received via the data communication control unit 15 and the wireless control unit 19, the content analysis unit 24 performs the prefetching as the process of step S12. The obtained data content is stored in the content storage unit 18. After the process of step S12, the content control unit 10 returns the process to step S2.

  On the other hand, when it is determined in step S3 that prefetching is unnecessary or cannot be prefetched and the process proceeds to step S4, the request control unit 21 of the content control unit 10 instructs the user to acquire content through the input control unit 11. It is determined whether or not an input has been made. Then, the content control unit 10 returns the process to step S2 while it is determined that the content acquisition instruction is not input by the request control unit 21, while the content acquisition instruction is input by the request control unit 21. When it is determined that the process has been performed, the process proceeds to step S5.

  In step S5, the content analysis unit 24 of the content control unit 10 has already stored the content instructed to be acquired by the user operation received by the request control unit 21 in the content storage unit 18. It is analyzed and determined whether the content (pre-read content).

  If the content analysis unit 24 determines that the content has been pre-read in step S5, the content control unit 10 proceeds to step S6, while the content analysis unit 24 has not been pre-read. If it is determined, the process proceeds to step S7.

  When the processing proceeds to step S6, the content analysis unit 24 of the content control unit 10 reads the preread content data stored in the content storage unit 18, and proceeds to step S8.

  When the processing proceeds to step S7, the request control unit 21 of the content control unit 10 generates information for requesting the content server 1 for the content instructed to be acquired by the user operation. The data content request information is transmitted via the data communication control unit 15 and the wireless control unit 19. When it is determined in step S3 that the radio wave condition is bad and wireless communication itself cannot be performed, in step S7, for example, display information for notifying the display control unit 22 is generated and displayed. The information is displayed on the unit 12 to notify the user.

  When the desired data content is transmitted from the content server 1 in response to the data content request in step S7 and the data content is received via the data communication control unit 15 and the wireless control unit 19, the content control unit 10 Then, the process is passed to the display control unit 22, and the process proceeds to step S8.

  In step S8, the display control unit 22 displays the data content (data content read from the content storage unit 18 or data content sent from the content server 1) on the display device of the display unit 12. Processing necessary for display is performed, and display data generated by the processing is transferred to the display unit 12 to display the content on the screen of the display device. It should be noted that control such as saving (that is, caching) the content that has already been displayed and not performing communication again when it is displayed again is generally performed, and content display control by the browser application of the present embodiment is performed. Needless to say, it can coexist with general control such as redisplay of cache content.

  Thereafter, the content control unit 10 returns the process to step S2.

[Processing flow of the base station when prefetch permission and prefetch data capacity are set on the base station side]
In FIG. 8, as described with reference to FIG. 5 above, the transmission power, communication quality, and prefetchable capacity are defined on the base station side. The flowchart on the base station side in the case of performing processing that permits prefetching is shown. Note that the processing of the flowchart of FIG. 8 is realized by the CPU of the communication control device installed in the base station executing the communication control program.

  In FIG. 8, when the base station receives a prefetch request for data content using the prefetch dedicated communication channel from the mobile phone terminal as the process of step S21, first, as the process of step S22, the congestion of the current communication band is performed. It is determined whether or not it is possible to secure the communication band of the prefetch-only communication channel from information such as the situation, the distance from the mobile phone terminal, and the required transmission power.

  If the base station determines in step S22 that the communication band of the pre-read-only communication channel cannot be secured due to the congestion state of the current communication band, etc., the base station proceeds to step S29 and transmits the pre-read request. After transmitting a notice for rejecting the prefetch communication to the mobile phone terminal, the process returns to step S21.

  On the other hand, if it is determined in step S22 that a prefetch-only communication channel can be secured, the base station proceeds to step S23 and performs communication quality when communicating with the mobile phone terminal that has transmitted the prefetch request. Measure. Note that the communication quality in this case is the same as described above.

  Next, the base station determines whether or not communication for prefetching can be permitted from the measured communication quality as the process of step S24.

  If the base station determines that permission is not permitted in step S24, the base station proceeds to step S29 and notifies the mobile phone terminal that has transmitted the prefetch request that prefetch communication is not permitted. The process returns to S21.

  On the other hand, if it is determined in step S24 that prefetch communication can be permitted, the base station advances the process to step S25.

  When the process proceeds to step S25, the base station determines a communication band that can be secured with a small transmission power when communicating with the mobile phone terminal that has transmitted the prefetch request, as described above with reference to FIG. Then, as the processing of step S26, the data capacity that permits prefetching to the mobile phone terminal is determined.

  Next, the base station sets a pre-read only communication channel with the mobile phone terminal that has transmitted the pre-read request as the process of step S27. Thereby, the mobile phone terminal can be prefetched.

  In addition, the base station determines whether or not a predetermined time during which data transfer through the pre-read-only communication channel as described above has been permitted has passed as the process of step S28. To return. Then, when returning to the processing of step S22, it is determined again whether or not the communication band of the pre-read-only communication channel can be secured. Close. If the communication band of the prefetch-only communication channel can be secured in step S22, the communication quality is measured again in step S23, and whether or not prefetch communication is possible is determined again in step S24. If it is determined that the prefetch communication is not possible, the prefetch dedicated communication channel is closed in step S29.

[Summary]
As described above, according to the embodiment of the present invention, when the radio wave condition (communication quality) is good, the data content is prefetched and stored. When the radio wave condition becomes bad, the prefetched data content is stored. By displaying the data so that it can be browsed, it is possible to reduce the stress on the user when browsing the data content by the browser application, and to improve the use efficiency of the radio wave band and power.

  In addition, according to the embodiment of the present invention, the contents of sites and pages registered in the “favorite list” are prefetched periodically, and the prefetching is performed in the order according to the priority. When there is a site or the like, the user can check more quickly as the priority is higher.

  Further, according to the embodiment of the present invention, the position where the radio wave condition is improved is set in advance or is automatically set by learning, so that the prefetching can be surely executed. The user's stress can be reduced, and the use efficiency of the radio wave band and power can be improved.

  The above description of the embodiment of the present invention is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made according to the design or the like as long as the technical idea according to the present invention is not deviated.

  In the above-described embodiment, the mobile phone terminal and its system have been exemplified. However, the present invention is not limited to these, and a PDA (Personal Digital Assistant) or a portable video game device equipped with a communication function and a browser application, The present invention can also be applied to various terminals such as a portable digital television receiver and a car navigation device.

It is a block diagram which shows schematic structure of the information communication system of embodiment of this invention. It is a block diagram which shows schematic structure of the mobile telephone terminal of this invention embodiment. It is a figure used for description of the parameter (setting value) referred when determining the possibility of prefetch according to an electromagnetic wave condition, or determining the amount of prefetch data at the time of prefetch determination. It is a figure used for description of the definition of transmission power and communication quality on the mobile phone terminal side. It is a figure used for description of the definition of transmission power in the base station side, communication quality, and prefetchable capacity. It is a figure used for description of the "favorite list" and parameters (setting values) that are referred to when determining the site to be prefetched, the number of links, and the amount of data in the prefetch determination. It is a flowchart of the prefetch process which a content control part performs based on the definition of communication quality and prefetch conditions. It is a flowchart of the process of the determination of the data capacity which the base station side performs based on transmission power, communication quality, and prefetchability, and the decision | availability of prefetching.

Explanation of symbols

  1 content server, 2 Internet, 3 exchange, 4 base station, 5 mobile phone terminal, 10 content control unit, 11 input control unit, 12 display unit, 13 timer unit, 14 GPS unit, 15 data communication control unit, 16 radio wave status Monitoring unit, 17 Prefetch determination condition storage unit, 18 Content storage unit, 19 Wireless control unit, 21 Request control unit, 22 Display control unit, 23 Prefetch determination unit, 24 Content analysis unit

Claims (11)

A display for displaying information;
A wireless communication unit for performing wireless communication;
A radio wave condition monitoring unit that monitors a radio wave condition at the time of wireless communication in the wireless communication unit;
A user instruction input unit for inputting an instruction from the user;
A setting value storage unit that stores setting values each associated with at least a plurality of radio wave conditions and a plurality of information prefetching levels;
From the setting values stored in the setting value storage unit, the information prefetching degree is determined according to the radio wave condition being monitored by the radio wave condition monitoring unit, and the determined information prefetching level is passed through the wireless communication unit. A prefetch control unit for controlling the prefetch acquisition of the received information;
An information storage unit for storing prefetched information through the wireless communication unit;
When an instruction for displaying information is input from the user through the user instruction input unit, if the information instructed to be displayed is stored in the information storage unit, the stored information is read and displayed. A control unit that displays the information acquired through the wireless communication unit on the display unit when the information instructed to display is not stored in the information storage unit.
An information communication terminal characterized by that.   When an instruction for displaying information is input from the user through the user instruction input unit, the control unit stores the information instructed to be displayed in the information storage unit and is monitored by the radio wave condition monitoring unit. The information communication terminal according to claim 1, wherein the stored information is read out and displayed on the display unit when the radio wave condition inside is poor. The radio wave condition monitoring unit acquires an index indicating communication quality at the time of wireless communication in the wireless communication unit as a value indicating the radio wave condition,
The information communication terminal according to claim 1, wherein the setting value storage unit stores a setting value in which an index indicating the communication quality is associated with the information prefetching degree. The wireless communication unit has a function of performing wireless communication using a plurality of wireless communication systems,
The setting value storage unit stores setting values in which the at least a plurality of radio wave conditions and a plurality of information prefetch levels are associated with each other for each of the plurality of wireless communication systems,
The prefetch control unit, when acquiring the prefetch of the information, determines which of the plurality of wireless communication systems to use according to the radio wave status being monitored by the radio wave status monitoring unit. Item 1. An information communication terminal according to item 1.   2. The information communication terminal according to claim 1, wherein the setting value storage unit also stores source address information of information prefetched and acquired through the wireless communication unit. The set value storage unit stores a value indicating a priority set for each provider address information as one of the set values that define the prefetching degree,
6. The prefetch control unit according to claim 5, wherein the prefetch control unit performs prefetching of the information according to a priority order set for each of the provider address information stored in the setting value storage unit. Information communication terminal. It has a location information acquisition unit that acquires location information,
The prefetch control unit learns the radio wave condition monitored by the wireless communication unit for each position acquired by the position information acquisition unit, and controls the prefetch acquisition of the information based on the learning result. The information communication terminal according to claim 1, wherein From a wireless communication base station, it has a base station information acquisition unit that acquires information indicating the transmission power and communication band of wireless communication and the amount of data that permits prefetching,
The wireless communication unit performs wireless communication through a dedicated communication channel using the communication band set by the wireless communication base station,
The prefetch control unit performs prefetching of information corresponding to the amount of data for which prefetching is permitted, using the transmission power acquired by the base station information acquisition unit and a dedicated communication channel of the communication band. Item 1. An information communication terminal according to item 1. Determines the transmission power and communication band during wireless communication with the information communication terminal and the data amount permitting prefetching, and transmits information indicating the transmission power, communication band and data amount permitting prefetching to the information communication terminal. And a radio communication base station that sets a dedicated communication channel using the communication band,
Data indicating the transmission power and communication band of wireless communication and the amount of data for which prefetching is permitted is acquired from the wireless communication base station, and the data for which prefetching is permitted using the dedicated communication channel of the transmission power and the communication band. A predetermined amount of information is prefetched and stored at a degree of information prefetching according to the radio wave conditions at the time of wireless communication, and when the user inputs an information display instruction, the information instructed to be displayed is already stored. An information communication terminal that reads and displays the stored information, and displays the information acquired through wireless communication when the display-instructed information is not stored.
An information communication system. A step of monitoring a radio wave condition at the time of wireless communication in a radio communication part performing wireless communication by a radio wave condition monitoring part;
Information according to the radio wave condition monitored by the prefetch control unit from the setting values stored in the setting value storage unit in association with at least a plurality of radio wave statuses and a plurality of information prefetch levels. Determining the prefetching level, and controlling the prefetching of information through the wireless communication unit at the determined information prefetching level;
Storing information prefetched through the wireless communication unit in an information storage unit;
When an instruction for displaying information is input from a user through a user instruction input unit through which a user operation is input, if the information instructed to be displayed is stored in the information storage unit, the information is stored. Is read out by the control unit and displayed on the display unit, and when the information instructed to be displayed is not stored in the information storage unit, the information acquired by the control unit through the wireless communication unit is displayed on the display unit. And a step of causing
A control method for an information communication terminal. A radio wave condition monitoring unit that monitors a radio wave condition at the time of wireless communication in a wireless communication part that performs wireless communication;
From the setting values stored in the setting value storage unit in association with at least a plurality of radio wave statuses and a plurality of information prefetching levels, the information prefetching level according to the radio wave status being monitored by the radio wave status monitoring unit is determined. A prefetch control unit that controls the prefetching of information through the wireless communication unit at the determined information prefetching degree;
An information storage control unit that stores information prefetched through the wireless communication unit in an information storage unit;
When an instruction for displaying information is input from the user through the user instruction input unit to which an instruction by the user is input, if the information instructed to display is stored in the information storage unit, the information is stored. As a control unit for reading out information displayed on the display unit and displaying the information acquired through the wireless communication unit on the display unit when the information instructed to display is not stored in the information storage unit,
An information communication terminal control program for operating an information communication terminal.

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