JP2009301213A - Information delivery server, mobile communication terminal, information delivery system and information delivery method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information delivery server, a mobile communication terminal, an information delivery system and an information delivery method that are efficient in terms of battery consumption and highly compatible with changes in user position. <P>SOLUTION: The mobile communication terminal 10, which transmits a delivery request signal including position information to the information delivery server 20 and receives delivery information corresponding to the position information from the information delivery server 20, includes an information storage part 14 for storing the delivery information, which includes content position information, content information corresponding to the content position information, and information on the distribution of content information located around the position information about the mobile communication terminal, in association with the position information, and a transmission determination part 15 for determining the presence of undelivered content information close to the latest position information according to the content information distribution information and determining whether or not to transmit the delivery request signal to the information delivery server 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an information distribution server, a mobile communication terminal, an information distribution system, and an information distribution method for distributing distribution information to mobile communication terminals.

  Communication services that distribute useful information to users of mobile communication terminals are widely spread to mobile communication terminals such as mobile phones. Among them, a position-dependent communication service that determines information to be distributed using the current position information of the user is widely used. Patent Documents 1 and 2 disclose techniques related to such a position-dependent communication service.

  In Patent Document 1, for a mobile phone that has transmitted content acquisition request data including specific location information sent from a location information server, content related to the specific location information included in the data is stored in the mobile phone. A mobile phone having a content server for transmitting, a location information stored in the past from the location information server, a content storage unit for storing a set of content acquired from the content server in the past, and making a distribution request to the content server An information providing system is disclosed.

Further, Patent Document 2 discloses a location registration server and an information providing server that deliver various information such as location information and content information of a management area related to a communication management area in which a mobile phone is located, and a delivery request to these servers. A communication system including a mobile phone that performs the above is disclosed.
JP 2004-289256 A JP 2006-155508 A

  However, in the information providing system described in Patent Document 1, when the mobile phone does not store the content related to the specific position information, the content acquisition request data is generated and the distribution request is made to the content server. I do. Therefore, even if the mobile phone does not store content related to specific location information even if it is in a quasi-stationary state without movement that does not change the content information to be acquired, it is uniform. This is inefficient from the viewpoint of power consumption. Further, in the information providing system described in Patent Document 2, the distribution request is made at the timing when the mobile phone is set in advance by the initial setting or at the timing set by the user. Therefore, when the content information to be acquired is in a high-speed movement state in which the content information changes frequently, updating of the content information may be delayed depending on the timing interval. Therefore, it has been difficult to achieve both efficiency of power consumption and follow-up of information update with respect to movement.

  The present invention has been made in view of such problems, and is an information distribution server, a mobile communication terminal, an information distribution system, and an information distribution server that are efficient in terms of power consumption and have high followability with respect to changes in the position of the user. An object is to provide an information distribution method.

  In order to solve the above problem, the mobile communication terminal according to the present invention transmits a distribution request signal including position information to a predetermined information distribution server, and receives distribution information corresponding to the position information from the predetermined information distribution server. A mobile communication terminal, positioning means for performing positioning of position information at a predetermined positioning cycle, content position information indicating a location close to the position information transmitted from the information distribution server, and content information corresponding to the content position information And information storage means for storing distribution information including information related to distribution of content information located around the position information of the mobile communication terminal in association with the position information, and distribution of content information stored in the information storage means Whether to determine the presence of undelivered content information close to the latest location information based on the information on the location and send a distribution request signal to the information distribution server A transmission determination means for determining whether a transmission request signal is transmitted to the information distribution server by the transmission determination means, a distribution request signal transmission means for transmitting a distribution request signal including the latest position information, It is characterized by providing.

  The mobile communication terminal according to the present invention includes not only the content position information indicating a location close to the position information of the mobile communication terminal and the content information corresponding to the content position information from the information distribution server, but also the periphery of the position information of the mobile communication terminal. Also receives information about the distribution of content information located at.

  Accordingly, the mobile communication terminal determines whether or not to transmit the distribution request signal to the information distribution server by determining the presence of undistributed content information close to the latest position information based on the information regarding the distribution of the content information. The distribution request signal can be transmitted only when necessary. Therefore, it is possible to avoid the distribution request signal being automatically transmitted when content related to the specific position information is not stored or at a predetermined timing interval as in the past. Therefore, according to the mobile communication terminal according to the present invention, it is possible to achieve both the efficiency of power consumption and the ability to follow information update with respect to movement.

  Also, according to the mobile communication terminal of the present invention, it is possible to estimate the distribution of content information including unacquired content information around the position information. Thereby, even if the distribution of content information around the location information of the mobile communication terminal is not uniform, it is possible to cope with the above and obtain the above effect.

  Moreover, it is preferable that the information regarding the distribution of the content information is a content density inside a specific area around the content position information indicating a location close to the position information of the mobile communication terminal.

  When there is a lot of content information including unacquired content information around the location information of the mobile communication terminal, if the mobile communication terminal receives the content location information associated with each content information as information related to the distribution of the content information, Is not efficient in terms of battery consumption and network usage. Therefore, by using the content density that is a statistical value as information related to the distribution of content information, it is possible to reduce the amount of communication, and to achieve efficient battery consumption and network usage.

  Further, it is preferable that the information related to the distribution of the content information is content position information corresponding to the content information positioned inside a specific area around the content position information indicating a location close to the position information of the mobile communication terminal. .

  Thereby, the information regarding distribution of content information can be grasped accurately. Further, when there is little content information around the location information of the mobile communication terminal, the amount of communication does not become a problem.

  Further, it is preferable that the specific area is specified by an area in which an annular area centering on the position information of the mobile communication terminal is drawn and an outer area of the annular area is divided.

  Thereby, the mobile communication terminal can keep content information around the position information equally in all directions, and even if the user of the mobile communication terminal cannot predict the next direction of travel, it can effectively follow the movement. Can be improved.

  An information distribution server according to the present invention is an information distribution server that distributes distribution information to the mobile communication terminal, and that receives a distribution request signal including position information transmitted from the mobile communication terminal. Means, distribution information storage means in which content information and content position information corresponding to the content information are stored in association with each other, content position information indicating a location close to the position information received by the distribution request signal receiving means, A distribution information acquisition means for acquiring distribution information including content information corresponding to the content position information and information regarding distribution of content information located around the position information of the mobile communication terminal, and acquired by a distribution information acquisition unit And an information distribution means for distributing the distribution information to the mobile communication terminal.

  In the information distribution server according to the present invention, for the mobile communication terminal that has transmitted the distribution request signal including the position information, content position information indicating a location close to the position information of the mobile communication terminal, and content information corresponding to the content position information In addition, information on the distribution of content information located around the location information of the mobile communication terminal is also distributed.

  Accordingly, the mobile communication terminal that has received the distribution information from the information distribution server according to the present invention determines the presence of undistributed content information close to the latest position information based on the information related to the distribution of the content information, and the information distribution server Whether or not to send a distribution request signal is determined, and the distribution request signal can be transmitted only when necessary. Therefore, it is possible to avoid the distribution request signal being automatically transmitted when content related to the specific position information is not stored or at a predetermined timing interval as in the past. Therefore, according to the information distribution server according to the present invention, it is possible to achieve both the efficiency of power consumption and the ability to follow information update with respect to movement.

  Further, according to the information distribution server of the present invention, the mobile communication terminal that has received the distribution information from the information distribution server can estimate the distribution of content information including unacquired content information around the position information. . Thereby, even if the distribution of content information around the location information of the mobile communication terminal is not uniform, it is possible to cope with the above and obtain the above effect.

  Moreover, it is preferable that the information regarding the distribution of the content information is a content density inside a specific area around the content position information indicating a location close to the position information of the mobile communication terminal.

  When there is a lot of content information including unacquired content information around the location information of the mobile communication terminal, when content location information itself associated with each content information is delivered from the information delivery server as information related to the distribution of content information, The amount of communication increases, which is not efficient from the viewpoint of battery consumption and network usage. Therefore, by using the content density that is a statistical value as information related to the distribution of content information, it is possible to reduce the amount of communication, and to achieve efficient battery consumption and network usage.

  Further, it is preferable that the information related to the distribution of the content information is content position information corresponding to the content information positioned inside a specific area around the content position information indicating a location close to the position information of the mobile communication terminal. .

  Thereby, the information regarding distribution of content information can be grasped accurately. Further, when there is little content information around the location information of the mobile communication terminal, the amount of communication does not become a problem.

  Further, it is preferable that the specific area is specified by an area in which an annular area centering on the position information of the mobile communication terminal is drawn and an outer area of the annular area is divided.

  Thereby, the mobile communication terminal can keep content information around the position information equally in all directions, and even if the user of the mobile communication terminal cannot predict the next direction of travel, it can effectively follow the movement. Can be improved.

  An information distribution system according to the present invention includes the mobile communication terminal and the information distribution server.

  According to the information distribution system according to the present invention, even if the distribution of content information is not uniform, the information distribution system in which both efficiency from the viewpoint of battery consumption and network utilization and followability to movement are compatible. Can be provided.

  The information distribution method according to the present invention includes a mobile communication terminal that transmits a distribution request signal including position information, and an information distribution server that distributes distribution information corresponding to the position information of the mobile communication terminal to the mobile communication terminal. In the information distribution method executed in the information distribution system, the mobile communication terminal determines the presence of undistributed content information close to the latest location information based on information on the distribution of content information included in the distribution information, and requests for distribution A transmission determination step for determining whether or not to transmit a signal to the information distribution server, and a transmission request including the latest position information when it is determined to transmit a distribution request signal to the information distribution server in the transmission determination step. A distribution request signal transmission step for transmitting a signal to the information distribution server, and the information distribution server transmitted in the distribution request signal transmission step. Distribution information including content position information indicating a location close to the latest position information included in the communication request signal, content information corresponding to the content position information, and information regarding a distribution of the content information located around the position information. And an information distribution step for transmitting to the mobile communication terminal.

  According to the information distribution method of the present invention, the mobile communication terminal determines the presence of undistributed content information close to the latest position information based on information related to the distribution of content information, and sends a distribution request signal to the information distribution server. It is possible to determine whether or not to transmit, and to transmit the distribution request signal only when necessary. Therefore, it is possible to avoid the distribution request signal being automatically transmitted when content related to the specific position information is not stored or at a predetermined timing interval as in the past. Therefore, according to the information distribution method according to the present invention, it is possible to achieve both the efficiency of power consumption and the ability to follow information update with respect to movement.

  Further, according to the information distribution method of the present invention, the mobile communication terminal can estimate the distribution of content information including unacquired content information around the location information. Thereby, even if the distribution of content information around the location information of the mobile communication terminal is not uniform, it is possible to cope with the above and obtain the above effect.

  According to the information distribution server, the mobile communication terminal, the information distribution system, and the information distribution method according to the present invention, it is possible to achieve both efficiency of power consumption and follow-up of information update with respect to movement.

  Hereinafter, preferred embodiments of an information distribution server, a mobile communication terminal, an information distribution system, and an information distribution method according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted.

  FIG. 1 is a diagram illustrating a functional configuration of an information distribution system 1 according to the present embodiment. As shown in FIG. 1, the information distribution system 1 includes a mobile communication terminal 10 and an information distribution server 20 connected to the mobile communication terminal 10 via a mobile communication network (not shown). The information distribution system 1 is a system in which the information distribution server 20 distributes distribution information such as text data, video data, and audio data including information useful to the user to the mobile communication terminal 10.

  As shown in FIG. 2, the mobile communication terminal 10 physically includes a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103 as a main storage device, and an input device 104. , An output device 105, a communication module 106, an auxiliary storage device 107, a battery 108a and a power supply unit 108 including a controller for controlling on / off of the battery 108a, and a GPS (Global Positioning System) receiving module 109. When these components operate, each function of the mobile communication terminal 10 described below is exhibited.

  FIG. 3 shows a hardware configuration of the information distribution server 20. As shown in FIG. 3, a CPU 201, ROM 202, RAM 203, an input device 204 such as a keyboard for inputting information to the information distribution server 20, an output device 205 such as a monitor for outputting information, and a data transmission / reception device The computer includes a communication module 206 such as a network card and an auxiliary storage device 207 such as a hard disk. By operating these components, the functions described later of the information distribution server 20 are exhibited. Subsequently, functions of the mobile communication terminal 10 and the information distribution server 20 will be described.

As shown in FIG. 1, the mobile communication terminal 10 includes a communication unit 11, a timer 13, a positioning unit 12, an information storage unit 14, a transmission determination unit 15, a distribution request signal transmission unit 16, and an output unit 17 as functional configurations. Is provided.

  The communication unit 11 transmits and receives various data such as call data and mails with other mobile communication terminals and fixed telephones.

  The positioning unit 12 monitors the time measured by the timer 13, and determines that the positioning cycle has elapsed when the time measured by the timer 13 reaches a time interval of a predetermined positioning cycle T, for example, 5 minutes, and performs GPS positioning. Do. Furthermore, the positioning unit 12 stores the position information acquired by GPS positioning in the information storage unit 14 in association with the positioning time, and resets the timer 13. In GPS positioning, latitude and longitude are calculated based on data from at least three or more GPS satellites, and position information of the mobile communication terminal 10 is obtained. Instead of the GPS positioning method, a cell-based positioning method, a single station positioning method, a multiple station positioning method, or the like may be used.

  The information storage unit 14 stores the positional information acquired by the positioning unit 12 in association with the positioning time, and stores a plurality of positional information. Furthermore, the top N pieces of content position information close to the position information distributed by the information distribution server 20 with respect to the position information transmitted by the mobile communication terminal 10, content information corresponding to each piece of content position information, and positioning information thereof Is stored in association with the content density information in the specific area including a plurality of pieces of content information.

  Here, the content information includes a wide range of information such as restaurants, retail stores, parks or public facilities. The content location information is information for specifying the location where the information is provided by the content information, that is, for specifying the location of a restaurant or retail store, a specific park or public facility that is the source of the content information. Information. The content distribution information indicates how much the content information is positioned in which range, and includes, for example, the content density in the specific area.

  The content density is calculated by C / S, where C is the number of content information positioned in the inner area (in a specific area) of a predetermined ring centered on the positioning position, and S is the area of the area. Value to be listed. Further, the content distribution information may be content position information itself corresponding to the content information positioned inside the specific area. Thereby, the information regarding distribution of content information can be grasped accurately. Further, when there is little content information around the position indicated by the position information of the mobile communication terminal, the amount of communication does not matter.

  However, in the present embodiment, when the content information is arranged in ascending order with respect to the distance from the position of the mobile communication terminal 10 based on the content position information associated with each content information, the Nth content information is “ This is referred to as “Nth content information”. The first to Nth content information is referred to as “top N content information” or simply “nearest content information”.

  The timer 13 keeps counting unless reset is performed by the positioning unit 12, and is used for determining the progress of the positioning cycle T by the positioning unit 12.

  The transmission determination unit 15 determines whether or not to transmit a distribution request signal to the information distribution server 20. Specifically, first, the positioning position is specified based on the position information of the mobile communication terminal 10 acquired by the positioning unit 12. Thereafter, the content information of N (N> 0) corresponding to the content position information close to the latest positioning position among the content information acquired and held from the information distribution server 20, for example, five contents information, and the information distribution server 20 content information corresponding to the content location information close to the latest location information (N> 0), for example, 5 content information is compared, and the number of content information items that do not match is C. The error rate C / N is estimated.

  If the estimated error rate is equal to or greater than a predetermined threshold value (for example, 0.6) set in advance, it is determined to transmit a distribution request signal for information distribution to the information distribution server. On the other hand, when the estimated error rate is less than a predetermined threshold (for example, 0.6) set in advance, it is determined not to transmit the distribution request signal to the information distribution server. When it is determined to transmit the position information to the information distribution server, this is output to the distribution request signal transmission unit 16.

  The distribution request signal transmission unit 16 receives a notification of determination to transmit the distribution request signal to the information distribution server from the transmission determination unit 15, and transmits a distribution request signal for information distribution to the information distribution server 20. More specifically, the distribution request signal transmission unit 16 receives the determination to transmit the distribution request signal to the information distribution server from the transmission determination unit 15, and the location information stored in the information storage unit 14. Among them, the position information with the latest positioning time is extracted. Thereafter, a distribution request signal including the latest position information is transmitted to the information distribution server 20.

  When receiving the distribution information from the information distribution server 20, the output unit 17 extracts the content information at the latest reception time from the content information stored in the information storage unit 14 and displays it on the output device 105.

  Moreover, it is preferable that the mobile communication terminal 10 is provided with the input part which can input the genre of content information. Thereby, the user of the mobile communication terminal 10 can receive the nearest content information for each genre of content information such as restaurants and hotels.

As shown in FIG. 1, the information distribution server 20 includes a distribution request signal reception unit 21, a distribution information storage unit 22, a distribution information acquisition unit 23, and an information distribution unit 24 as a functional configuration.
The distribution information storage unit 22 stores content information and content position information for specifying a location where the content information is distributed in association with each other. Each content information is further associated with related information accompanying the content information such as “restaurant” and “hotel”.

  The distribution request signal receiving unit 21 receives a distribution request signal from the mobile communication terminal 10 and extracts position information of the mobile communication terminal 10 included in the distribution request signal. Further, the distribution request signal receiving unit 21 notifies the distribution information acquiring unit 23 of the extracted position information.

  The distribution information acquisition unit 23 is the latitude and longitude identified from the position information notified from the distribution request signal reception unit 21, that is, the top N pieces of content position information close to the positioning position, and the content corresponding to each piece of the content position information Information is acquired from the distribution information storage unit 22. Further, content density information that is information related to the distribution of content information around the positioning position of the mobile communication terminal 10 is acquired. However, when a predetermined condition is input to the input unit by the user of the mobile communication terminal 10, the distribution information acquisition unit 23 associates the related information that matches the input condition with the content. In acquiring the content position information corresponding to the information and acquiring the content density information, only the content information and the content position information associated with the related information matching the input condition are considered.

  Subsequently, the acquired content information, content position information, and content density information are output to the information distribution unit 24 by the distribution information acquisition unit 23. Here, as information on the distribution of content information, the number of content information positioned in a certain area among the areas obtained by drawing a circle centering on the positioning position and meshing all directions of the outer area of the ring Where C is the area of the same region and S is the content density calculated by C / S, which is the content position information itself corresponding to the content information positioned within the area S of the same region. May be.

  The information distribution unit 24 distributes the content information, content position information, and content density information input from the distribution information acquisition unit 23 to the mobile communication terminal 10.

Subsequently, information distribution processing by the information distribution system 1 according to the present embodiment will be described with reference to FIG. 4. First, the positioning unit 12 determines whether or not the measured value of the timer 13 has passed the positioning cycle T. (Step S11). When it is determined that the measured time has passed the positioning cycle T, the positioning unit 12 performs GPS positioning and acquires the position information of the mobile communication terminal 10 (step S12). Thereafter, the positioning unit 12 stores the acquired position information and the positioning time at which the GPS positioning is performed in association with each other in the information storage unit 14 and resets the timer 13 (step S13).

  Subsequently, the top N corresponding to the content information close to the location information of the mobile communication terminal 10 among all the content information received from the information distribution server 20 in the past and kept in the information storage unit 14 by the transmission determination unit 15. Content information and the top N pieces of content information corresponding to content positions close to the position information of the latest mobile communication terminal 10 among all pieces of content information held by the information distribution server 20 are compared, and content information that does not match The error rate (C / N) of the stored content information is estimated with C as the number of cases (step S14). Details of the estimation method will be described later.

  Next, the transmission determination unit 15 determines whether the estimated error rate (estimated error rate) is larger than an error rate (target error rate) that serves as a threshold for requesting distribution (step S15). As a result, when it is determined that the estimated error rate is smaller than the target error rate, the distribution request signal for the information distribution server 20 is not transmitted to the information distribution server 20, and the process returns to step S11 and the above steps are repeated. .

  On the other hand, when it is determined that the estimated error rate is equal to or higher than the target error rate, a notification that the transmission determination unit 15 has determined to transmit the distribution request signal is transmitted to the distribution request signal transmission unit 16. Thereafter, the distribution request signal transmission unit 16 extracts the latest position information stored in the information storage unit 14, and transmits a distribution request signal including the extracted position information to the information distribution server 20 (step S16). At this time, accompanying information such as positioning time is transmitted together with the position information.

  Thereafter, the distribution request signal receiving unit 21 of the information distribution server 20 receives the distribution request signal transmitted from the mobile communication terminal 10 and acquires the position information of the mobile communication terminal 10 included in the distribution request signal. (Step S21). Thereafter, the distribution information acquisition unit 23 includes the latitude and longitude specified from the acquired mobile communication terminal 10, that is, content information corresponding to the top N content position information close to the positioning position, and content corresponding to the content information. Distribution information including position information and peripheral content density based on the latest position information is distributed to the mobile communication terminal 10 (step S22).

  Thereafter, distribution information including content information distributed from the information distribution server 20 by the communication unit 11 of the mobile communication terminal 10, content position information, and peripheral content density information is received, and the received distribution information is the reception time. And stored in the information storage unit 14 (step S17).

  The mobile communication terminal 10 repeatedly executes the processes in steps S11 to S17 described above, and the information distribution server 20 executes the processes in steps S21 and S22. That is, the mobile communication terminal 10 repeatedly performs GPS positioning at time intervals along the positioning cycle T, calculates the error rate, and determines that the error rate is greater than the target error rate, the distribution request including the location information The signal is transmitted to the information distribution server 20. In the information distribution server 20, the positioning position is specified based on the position information acquired from the mobile communication terminal 10, content information corresponding to the top N pieces of content position information close to the positioning position, and content corresponding to each piece of the content information Distribution information including position information and peripheral content density based on the latest position information is distributed to the mobile communication terminal 10. The mobile communication terminal 10 that has received the distribution information stores the distribution information in the information storage unit in association with the reception time.

  Subsequently, an error rate estimation process of the stored content information by the transmission determination unit 15 of the present embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a flowchart showing a procedure for estimating the error rate in the mobile communication terminal 10. FIG. 6 supplements the flowchart of FIG. Here, the number of pieces of content information targeted for error rate is N. Also, here, the mobile communication terminal 10 discards all the distribution information including content information, content position information, and content density information distributed from the information distribution server 20 in the past, and only the latest distribution information is stored in the information storage unit. 14 to hold.

  First, the number N of content information items to be referred to for calculating the error rate of stored content information is substituted into a variable n (step S31). Specifically, out of the number of pieces of content information held by the mobile communication terminal 10, N = 2 when estimating the error rate for the top two pieces of content information based on the latest positioning position, 2 is assigned to n.

Next, the transmission determination unit 15 associates the positioning position P ₀ when the previous distribution information is distributed with the content position information that maximizes the distance from the positioning position P ₀ among the content information received at that time. The distance r ₀ between the obtained content information I ₀ and the positioning position P ₀ is calculated. In addition, the latest located position P _i to be the i-th counted from the last of information delivery, the corresponding distance from the positioning position P _i in the content information received the last of information delivery is of far content position information to the n-th Tagged content information _{I i,} and calculates the distance between the _n and the measured position _{P i r i,} and _n, the distance _{d i} between the located position _{P 0} and the positioning position _{P i,} and _n.

Thereafter, it is determined whether or not the relationship r ₀ > d _{i, n} + ri _{, n} is satisfied (step S32). If it is determined that the relationship is satisfied, the error rate is estimated to be 0 and the estimation process is terminated (step S33).

On the other hand, if it is determined that this relationship is not satisfied, the process proceeds to the next step (step S34). In step S34, the transmission determining unit 15 is located inside a circle (P _i , r _{i, n} ) centered on the positioning position P _i and having a radius r _{i, n} , and centered on the positioning position P _{0. The} area of the regions a _{i, n} that do not overlap with the circle (P ₀ , r ₀ ) having a radius of ₀ is calculated. Furthermore, non-transmission judging section 15, which utilizes the content density information stored in the information storage unit 14 receives from the information distribution server 20 in step S17 in FIG. 4, positioned in the inner region a _{i, n} The number c _{i, n} of the acquired content information is estimated (step S34). Here, c _{i, n} is the number of pieces of unacquired content information associated with a position where the distance from the positioning position P _i is closer than the content information I _{i, n} .

Next, it is determined whether the relationship of c _{i, n} = N−n or c _{i, n} = N−n + 1 is satisfied (step S35). As a result, if these relationships are satisfied, the error rate is estimated as ci _{, n} / N, and the estimation process ends (step S36). On the other hand, if these relationships are not satisfied, the process proceeds to step S37.

In step S37, it is determined whether the relationship of c _{i, n} <N−n is satisfied (step S37). As a result, when it is determined that the relationship is satisfied, the error rate is estimated to be (N−n) / N and the estimation process ends (step S38).

  On the other hand, if this relationship is not satisfied, the process proceeds to step S38. In step S39, it is determined whether the requirement of n = 1 is satisfied (step S39). As a result, if it is determined that the requirement is satisfied, the error rate is estimated to be 1 and the estimation process ends (step S40). On the other hand, when this requirement is not satisfied, the value of n-1 is substituted for n and the process returns to step S35, and steps S34 to S41 are repeated until the error rate is calculated.

  Next, the operation procedure shown in the flowchart of FIG. 5 will be described using a specific example. Here, the information distribution server 20 holds seven pieces of content information C1, C2, C3, C4, C5, C6, and C7 as content information close to the location information of the mobile communication terminal 10, and corresponds to each piece of content information. It is assumed that the content position information to be registered is registered in the information distribution server 20 as having the relationship as shown in FIG. 7 with respect to the position of the mobile communication terminal 10. It is assumed that in the one-time information distribution from the information distribution server 20, the top five pieces of content information corresponding to the latest position information are distributed to the mobile communication terminal 10.

  Therefore, in the case of FIG. 7, only five pieces of content information C1, C2, C3, C4, and C5 distributed in the circle 1 shown in FIG. 8A are transmitted to the mobile communication terminal 10, and the information storage unit 14 Is remembered. FIG. 8B shows an example in which the content information C1 to C5 is stored in the information storage unit 14.

  In addition, the information distribution server 20 transmits the content density information around the latest location information to the mobile communication terminal 10 together with the nearest content information (top 5 content information) (step S18). In the present embodiment, the information distribution server 20 determines the area 1 around the mobile communication terminal 10 based on the number of contents information positioned in the area 1 and the area of the area 1 as shown in FIG. It is assumed that the internal content density is calculated and the calculated content information density is distributed to the mobile communication terminal 10. When the content density in region 1 is distributed to mobile communication terminal 10, content density values in all directions around circle 1 other than region 1 are transmitted from information distribution server 20 to mobile communication terminal 10. And

  Under such conditions, among the five pieces of retained content information held by the mobile communication terminal 10, the error rate is determined for the content information that is the top two (ie, N = 2) when the latest location information is used as a reference. The estimation method will be described below.

First, consider a case where the mobile communication terminal 10 has moved to a positioning position P _i (i = 1) shown in FIG. At this time, the content information shown in FIG. 11A and held by the mobile communication terminal 10 is arranged from top to bottom in order from the closest side of the mobile communication terminal 10 before moving. ). FIG. 6C shows the content information held by the mobile communication terminal 10 rearranged from top to bottom in order from the side closer to the mobile communication terminal 10 after movement. (Note that the content information shown in FIG. 11B is shown in FIG. 13B, FIG. 15B, FIG. 16B, FIG. 17B, and FIG. 18B described later. The content information shown in FIG. 11C corresponds to FIG. 13C, FIG. 15C, FIG. 16C, FIG. 17C, and FIG. 18C. To do).

Here, the mobile communication terminal 10 estimates the error rate for the top two items (that is, N = 2) of content information C2 and C1 (see FIG. 11D). Since the content information distributed at the position before the movement was C1, C2, C3, C4, and C5 (see FIG. 11B), it is not yet inside the circle 1 depicted in FIG. The mobile communication terminal 10 can guide that the acquired content information is not positioned (that is, c _1,2 = 0). Therefore, it is derived that the unacquired content information cannot exist inside the circle 2 included in the circle 1 (that is, c _1,2 = 0) (dotted line regions in FIGS. 3C and 3D). reference).

As a result, the mobile communication terminal 10 determines that there are no errors in the top two cases and estimates an error rate of zero. When the circle 1 includes the circle 2 _, the relationship r ₀ > d _{i, n} + ri _{, n} determined in step S32 in the flowchart of FIG. 5 is satisfied. Further, the above error rate 0 coincides with the estimated value in step S33.

Next, consider a case where the mobile communication terminal 10 further moves and moves to the positioning position P _i (i = 2) in FIG. 12 (corresponding to FIG. 13A). In this case, after step S31, it is determined in step S32 whether the relationship r ₀ > d _{i, n} + ri _{, n} is satisfied, but since the relationship is not satisfied, the process proceeds to step S34. In step S34, the content associated with the position farthest from the latest positioning position among the top two items (N = 2) of the content information held by the mobile communication terminal 10 (see FIG. 13B). The number c _2,2 of unacquired content information existing nearer to the information C1 (see FIG. 13C) is estimated (step S33).

As the c _2,2 estimation method, the mobile communication terminal 10 calculates the product of the content density of the region 1 shown in FIG. 9 and the area of the region 2 shown in FIG. A method of estimating the number c _2,2 of unregistered content information positioned inside the network is conceivable.

Further, when the content density information transmitted from the information distribution server 20 is content density information obtained for each mesh area as shown in FIGS. 14A and 14B, c ₂ and ₂ can be estimated. That is, in the case of FIG. 14A, as shown in FIG. 14C, the ratio of overlapping each mesh region with a non-overlapping region (in FIG. 14C, overlapping with the non-overlapping region in the unit mesh region A). The ratio is 55%.) And is multiplied by the content density of the mesh area, and the sum of all meshes is taken to estimate the number of unacquired content information in the non-overlapping area. it can. More specifically, if the content densities of the unit mesh areas A, B, C, D, E, and F are D _A , D _B , D _C , D _D , D _E , and D _F , The number of acquired content information corresponds to a value obtained by (D _A × 55 + D _B × 50 + D _C × 25 + D _D × 15 + D _E × 25 + D _F × 15) / 100.

  Also, as shown in FIGS. 14A and 14B, when the content density information transmitted from the information distribution server 20 is the density of the content information obtained for each mesh area, the service provision target It is preferable to use different mesh shapes depending on the traffic lines of the main transportation in the area. More specifically, when the main road has a grid pattern such as Kyoto and Sapporo, a rectangular mesh shape as shown in FIG. 14 (a) is used. In the case of a town where tracks are arranged radially, it is preferable to use a circular mesh shape as shown in FIG.

As shown in FIG. 15D, when the mobile communication terminal 10 estimates that two pieces of unacquired content information c _2,2 are positioned in the region 2 (c _2,2 = 2), the content Although it can be estimated that two of the three pieces of content information estimated to be closer to the latest positioning position than C1 are unacquired content information, as shown in FIG. It is not possible to estimate the rank of the distance.

For general distance ranking Top N it is possible to estimate satisfies _{c i,} n = N-n or _{c i, n = N-n} + 1 relationship requirement is determined in step S35 in the flowchart of FIG. 5 This is the condition. That is, when this condition is satisfied, the distance rank can be estimated, so that the error rate can also be estimated. However, when the mobile communication terminal 10 moves to the positioning position P _i (i = 2), as shown in FIG. 15D, since c _2,2 = N = n = 2, the same condition is satisfied. Instead, processing continues. Further, since c _2,2 = N = n = 2, the requirements in step S37 and step S39 are not satisfied, and the process proceeds to step S41, where n = 1. Thereafter, the process returns to step S34, and steps S34 to S41 are repeated.

Specifically, the mobile communication terminal 10 performs the same processing as shown in FIG. 16 for the content information C2 (n = 1) that is one higher in the content information. As a result, when it is estimated that one piece of unacquired content information is positioned inside the area 3 (c _2,1 = 1) as shown in FIG. Since it can be estimated that one is C2 and the other is unacquired content information, the mobile communication terminal 10 determines this as an error rate of 0.5 (dotted line regions in FIGS. 3C and 3D). reference). This will be described with reference to the flowchart of FIG. 5. Since c _2,1 = 1 and N−n = 2−1 = 1, c _2,1 = N−n, and the error rate in step S35. It is estimated that c _2,1 /N=0.5.

On the other hand, when it is estimated that two pieces of unacquired content information are positioned inside the area 3 (c _2,1 = 2) as shown in FIG. Since it is estimated that the content information is acquired content, the error rate is determined to be 1 (see dotted line regions in FIGS. 3C and 3D). This will be described with reference to the flowchart of FIG. 5. Since c _2,1 = N−n + 1, the error rate is estimated to be c _2,1 / N = _2/2 = 1 in step S35.

Further, as shown in FIG. _18D , when it is estimated that the unacquired content information is not positioned in the area 3 (that is, c _2,1 = 0), the (higher) first place is C2. It is estimated that there is, but it is not possible to estimate the content information of the second place only by this. However, as shown in FIG. 15 (d), it is estimated that two of the top three cases are unacquired content information (c _2,2 = 2), so the top one is the acquired content information C2. Therefore, it can be estimated that the second rank is unacquired content information (see FIG. 15E). Therefore, the mobile communication terminal 10 estimates the error rate to be 0.5 (see the dotted line areas in FIGS. 2C and 2D). This will be described with reference to the flowchart of FIG. 5. Since c _2,1 <N−n, the error rate (N−n) / N = (2-1) /2=0.5 in step S39. Presumed.

  According to the mobile communication terminal 10, the information distribution server 20, the information distribution system 1, and the information distribution method described above, the information distribution server 20 transmits the mobile communication to the mobile communication terminal 10 that has transmitted the distribution request signal including the position information. Distributes not only the top N content location information close to the location information of the terminal 10 and content information corresponding to each content location information, but also information on the distribution of content information located around the location information of the mobile communication terminal 10 To do.

  Thereby, the mobile communication terminal 10 determines whether or not to transmit a distribution request signal to the information distribution server in consideration of information related to the distribution of content information, and transmits the distribution request signal only when necessary. it can. Therefore, it is possible to avoid the distribution request signal being automatically transmitted when content related to the specific position information is not stored or at a predetermined timing interval as in the past. Therefore, it is possible to achieve both the efficiency of power consumption and the ability to follow information update with respect to movement. In addition, it is efficient from the viewpoint of network use, and content information distribution with little delay can be realized.

  In addition, the mobile communication terminal 10 that has received the distribution information from the information distribution server 20 can estimate the distribution of content information including unacquired content information around the position information. Thereby, even when the distribution of content information around the position information of the mobile communication terminal 10 is not uniform, it is possible to cope with it, and the above effect is obtained even when the distribution of content information is not uniform. be able to.

  Further, the information on the distribution of the content information is the content density corresponding to the content density within the specific area around the content position information closest to the position information of the mobile communication terminal 10 or the content position corresponding to the content information positioned within the specific area. Information. If there is a lot of content information including unacquired content information around the location information of the mobile communication terminal 10, the content location information itself associated with each content information is distributed from the information distribution server as information related to the distribution of the content information. The amount of communication increases and is not efficient from the viewpoint of battery consumption and network usage.

  However, by using the content density, which is a statistical value, as information related to the distribution of content information, it is possible to reduce the amount of communication and achieve efficient battery consumption and network usage. Further, by using the content position information corresponding to the content information positioned inside the specific area as the information related to the distribution of the content information, the information related to the distribution of the content information can be accurately grasped. Further, when there is little content information around the location information of the mobile communication terminal, the amount of communication does not become a problem.

  The specific region is specified by a region in which a ring centering on the position information of the mobile communication terminal is drawn and the outer region of the ring is divided into meshes. In general, the direction in which the user of the mobile communication terminal proceeds next cannot be predicted. Thereby, the content information density including unacquired content information can be held in the mobile communication terminal equally in all directions.

  Thereby, the mobile communication terminal can hold the content information around the position information equally in all directions, and even when the user of the mobile communication terminal cannot predict the next direction, it can cope.

  Hereinafter, a modified example of the method for estimating the error rate of retained content information will be described. In this modification, the information on the distribution of the content information located around the location information distributed from the information delivery server 20 to the mobile communication terminal 10 is the content location information nearest to the location information of the mobile communication terminal 10. This is the error rate inside a specific area. As shown in FIGS. 19 (a) and 19 (b), in this modification, the information distribution server 20 draws a rectangular mesh or a circular mesh centered on the center point of the circle 1 within a certain range and performs mobile communication. The information distribution server 20 calculates in advance the error rate when the terminal 10 moves to the center point of each mesh for all meshes within a certain region. As a result, in FIGS. 19A and 19B, a mesh with an error rate less than the target error rate is marked with a circle, and a mesh with an error rate greater than or equal to the target error rate is marked with a cross. Yes.

  Thereafter, the information distribution server 20 sends only information relating to the mesh position where the error rate is less than the target error rate to the mobile communication terminal 10 in step S22.

  Information about the error rate of the sent mesh is stored in the information storage unit 14. In such a modification, the determination of whether or not the transmission determination unit 15 transmits the distribution request signal to the information distribution server 20 is based on the current location of the mobile communication terminal 10 being stored in the information storage unit 14. It is determined by determining whether it belongs to the inside of the mesh. That is, when it is determined that the information does not belong to the mesh stored in the information storage unit 14, the error rate is determined to be equal to or higher than the target error rate, and the distribution request signal transmission unit 16 notifies the information distribution server 20. A distribution request signal is transmitted.

  In this modification, the information about the distribution of the content information located around the position information distributed from the information distribution server 20 is an error in a specific area around the content position information closest to the position information of the mobile communication terminal 10. Since it is the rate, it can be easily determined whether or not the distribution determination signal is transmitted in the transmission determination unit 15.

  The present invention is not limited to the various embodiments described above. For example, in the present embodiment, an example has been described in which the output information is displayed on the output device when the distribution information is received. However, the present invention is not limited to this. For example, in a folding mobile communication terminal or the like, content information may not be displayed when the mobile communication terminal is closed, and the latest content information may be displayed only when the mobile communication terminal is opened.

It is a figure which shows the functional structure of the information delivery system which concerns on this embodiment. It is a figure which shows the hardware constitutions of the mobile communication terminal which concerns on this embodiment. It is a figure which shows the hardware constitutions of the information delivery server which concerns on this embodiment. It is a figure for demonstrating the information delivery process by the information delivery system which concerns on this embodiment. It is a flowchart which shows the procedure which concerns on the estimation of the error rate in the mobile communication terminal which concerns on this embodiment. FIG. 6 is a diagram for supplementing the flowchart of FIG. 5. It is a figure for demonstrating the specific example of the operation | movement procedure shown to the flowchart of FIG. It is a figure for demonstrating the specific example of the operation | movement procedure shown to the flowchart of FIG. It is a figure for demonstrating the specific example of the operation | movement procedure shown to the flowchart of FIG. It is a figure for demonstrating the specific example of the operation | movement procedure shown to the flowchart of FIG. It is a figure for demonstrating the specific example of the operation | movement procedure shown to the flowchart of FIG. It is a figure for demonstrating the specific example of the operation | movement procedure shown to the flowchart of FIG. It is a figure for demonstrating the specific example of the operation | movement procedure shown to the flowchart of FIG. It is a figure which shows the content density information of the mesh unit delivered from the information delivery server which concerns on this embodiment. It is a figure for demonstrating the specific example of the operation | movement procedure shown to the flowchart of FIG. It is a figure for demonstrating the specific example of the operation | movement procedure shown to the flowchart of FIG. It is a figure for demonstrating the specific example of the operation | movement procedure shown to the flowchart of FIG. It is a figure for demonstrating the specific example of the operation | movement procedure shown to the flowchart of FIG. It is a figure for demonstrating the modification of the estimation method of the error rate of the holding | maintenance content information which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Information delivery system, 10 ... Mobile communication terminal, 11 ... Communication part, 12 ... Positioning part, 13 ... Timer, 14 ... Information storage part, 15 ... Transmission judgment part, 16 ... Delivery request signal transmission part, 17 ... Output part , 20 ... Information distribution server, 21 ... Distribution request signal receiving unit, 22 ... Distribution information storage unit, 23 ... Distribution information acquisition unit, 24 ... Information distribution unit.

Claims (10)

A mobile communication terminal that transmits a distribution request signal including position information to a predetermined information distribution server and receives distribution information corresponding to the position information from the predetermined information distribution server;
Positioning means for performing positioning of the position information at a predetermined positioning cycle;
Content location information indicating a location close to the location information transmitted from the information distribution server, content information corresponding to the content location information, and distribution of the content information located around the location information of the mobile communication terminal Information storage means for storing the distribution information including information related to the position information,
Based on the information related to the distribution of the content information stored in the information storage means, the presence of the undelivered content information close to the latest position information is determined and the distribution request signal is transmitted to the information distribution server Transmission determination means for determining whether or not,
When it is determined by the transmission determination means that the distribution request signal is transmitted to the information distribution server, a distribution request signal transmission means for transmitting the distribution request signal including the latest position information;
A mobile communication terminal comprising:   2. The movement according to claim 1, wherein the information on the distribution of the content information is a content density inside a specific area around the content position information indicating a location close to the position information of the mobile communication terminal. Communication terminal.   The information related to the distribution of the content information is the content position information corresponding to the content information positioned inside a specific area around the content position information indicating a location close to the position information of the mobile communication terminal. The mobile communication terminal according to claim 1.   The said specific area draws the annular ring centering on the said positional information on the said mobile communication terminal, and is specified by the area | region which divided | segmented the outer area | region of this annular ring. Mobile communication terminals. An information distribution server that distributes distribution information to the mobile communication terminal according to any one of claims 1 to 4,
A distribution request signal receiving means for receiving a distribution request signal including position information transmitted from a mobile communication terminal;
Distribution information storage means for storing content information and content position information corresponding to the content information in association with each other;
The content location information indicating a location close to the location information received by the delivery request signal receiving means, the content information corresponding to the content location information, and the location information around the location information of the mobile communication terminal Distribution information acquisition means for acquiring the distribution information including information related to distribution of content information;
Information distribution means for distributing the distribution information acquired by the distribution information acquisition means to the mobile communication terminal;
An information distribution server comprising:   6. The information according to claim 5, wherein the information on the distribution of the content information is a content density inside a specific area around the content position information indicating a location close to the position information of the mobile communication terminal. Distribution server.   The information related to the distribution of the content information is the content position information corresponding to the content information positioned inside a specific area around the content position information indicating a location close to the position information of the mobile communication terminal. The information distribution server according to claim 5.   The said specific area draws a ring centering on the said positional information on the said mobile communication terminal, and is specified by the area | region which divided | segmented the outer area | region of this ring, It is characterized by the above-mentioned. The information distribution server described. The mobile communication terminal according to any one of claims 1 to 4,
The information delivery server according to any one of claims 5 to 8,
An information distribution system comprising: Information executed in an information distribution system comprising: a mobile communication terminal that transmits a distribution request signal including position information; and an information distribution server that distributes distribution information corresponding to the position information of the mobile communication terminal to the mobile communication terminal In the delivery method,
The mobile communication terminal determines the presence of undelivered content information close to the latest location information based on information related to distribution of content information included in the distribution information, and sends the distribution request signal to the information distribution server. A transmission determination step for determining whether or not to transmit;
When it is determined in the transmission determination step that the distribution request signal is transmitted to the information distribution server, a distribution request signal transmission step of transmitting the distribution request signal including the latest position information to the information distribution server. When,
Content information indicating a location close to the latest position information included in the distribution request signal transmitted in the distribution request signal transmitted by the information distribution server, and content information corresponding to the content position information; An information distribution step of transmitting the distribution information including information on a distribution of the content information located around the position information to the mobile communication terminal;
An information delivery method comprising:

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