JP2007318361A - Communication system, communication program, recording medium, and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system and the like, which selects a base station of the optimum switching destination by estimating the position, speed, and moving direction of even a mobile station mounted with no GPS unit without requiring position information on the mobile station that an MNO (Mobile Network Operator) manages when an MVNO (Mobile Virtual Network Operator) provides switching service for base stations through which one mobile station uses a plurality of mobile communication networks while crossing them. <P>SOLUTION: On the basis of radio wave intensities measured by a radio wave intensity measuring unit 22 from a plurality of base stations 16a etc., for a predetermined time and predetermined base station information on respective base stations 16a etc., sent from a server 40, a movement track calculating unit 24 calculates a movement track of a mobile phone 20 at predetermined time by a predetermined system, and when a base station selecting unit 25 assumes that the mobile phone 20 will move in an extension direction P' of the movement track P, a base station having maximum radio wave intensity is selected in the extension direction P', thereby selecting not a base station 16b whose radio wave is most intense, but the base station 16d whose radio wave is considered to possibly become more intense from now on. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a communication system or the like between a mobile information terminal device and an information terminal device capable of IP telephones via a plurality of mobile communication networks and an IP (Internet Protocol) network.

  In recent years, a variety of services are being provided by virtual mobile communication operators (Mobile Virtual Network Operators: MVNOs) utilizing the mobile communication networks of existing mobile communication operators (Mobile Network Operators: MNOs) (non-patented) Reference 1). In particular, a base station switching service in which a plurality of MNO mobile communication networks are used by one mobile station is attracting attention. Here, considering the case of closing to one MNO, the position of the mobile station and the position of the base station are managed by the MNO. The base station switching timing is also determined by the MNO logic. However, when a MVNO provides a base station service in which a plurality of mobile communication networks are used by one mobile station, each MNO does not disclose the location information of the mobile station to other companies in the contract based on the contract agreement. The MVNO cannot manage the location of the mobile station. For this reason, there has been a problem that it is impossible to select an optimal switching destination base station from the position information of the mobile station. In order to solve this problem, the position of the mobile station is applied by applying a conventional technique (refer to Patent Document 1) for predicting the movement path of the mobile station with reference to map information using GPS (Global Positioning System). It is conceivable to estimate the speed and direction of movement.

Ministry of Internal Affairs and Communications General Communications Infrastructure Bureau, “Guidelines on Application Relationship of Telecommunications Business Law and Radio Law concerning MVNO”, [online], April 2004, [Search April 10, 2006], Internet <URL: http://www.soumu.go.jp/s-news/2002/pdf/020611_2a_3.pdf> JP 2004-228881 A

 However, when using GPS, the mobile station needs to be equipped with a GPS unit. For this reason, in the case of a mobile station not equipped with a GPS unit, the MVNO cannot estimate the position, speed, and direction of movement of the mobile station, and selects an optimal switching destination base station from the position of the mobile station. There was a problem that could not.

  Accordingly, an object of the present invention has been made to solve the above-described problem. When the MVNO provides a base station switching service in which a plurality of mobile communication networks are used by one mobile station, a GPS unit is provided. Even in the case of a mobile station not equipped with a mobile station, it is possible to estimate the position, speed, and moving direction of the mobile station without requiring the position information of the mobile station managed by the MNO. It is to provide a communication system or the like that can select.

  A communication system according to the present invention is a communication system between a mobile information terminal device and an information terminal device capable of making an IP call via a plurality of mobile communication networks and an IP network, and the information terminal device is connected via an IP network. The mobile information terminal device can communicate with the server via a mobile communication network and an IP network, and includes at least three mobile communication networks including the mobile communication network in which the mobile information terminal device is located. A mobile communication network exists in the vicinity of the mobile information terminal device, the server includes a base station information recording unit that records predetermined base station information, and the mobile information terminal device includes a plurality of mobile communication terminals. Radio wave intensity measuring means for measuring radio wave intensity from each base station of the network for a predetermined time; base station information requesting means for requesting the server for predetermined base station information relating to each base station; and the radio wave intensity measuring means for a predetermined time. Each measured The movement information at the predetermined time based on the radio field intensity from the ground station and the predetermined base station information recorded in the base station information recording unit transmitted by the server based on the request by the base station information requesting means. A movement trajectory calculating means for calculating a movement trajectory of the terminal device by a predetermined method; a base station selecting means for selecting a base station that satisfies a predetermined base station selection condition based on the movement trajectory calculated by the movement trajectory calculating means; Base station switching requesting means for requesting the server to switch to the base station selected by the base station selecting means, the server in the base station information recording unit based on the request by the base station information requesting means The base station information transmitting means for transmitting the recorded predetermined base station information to the mobile information terminal device side, and the base station requested to switch by the base station switching request means Further comprising a base station switching means for switching the communication between the dynamic information terminal apparatus and the information terminal apparatus and said.

  Here, in the communication system of the present invention, when the predetermined base station selection condition assumes that the mobile information terminal device moves in the extension direction of the movement trajectory calculated by the movement trajectory calculation means, the extension direction The condition for selecting the base station that maximizes the radio field intensity can be used.

  Here, in the communication system according to the present invention, when the predetermined base station selection condition assumes that the mobile information terminal device moves in an extension direction of the movement locus calculated by the movement locus calculation means, the movement locus In accordance with the moving speed of the mobile information terminal device calculated based on the above, the condition for selecting the base station that maximizes the radio field intensity in the extending direction can be set.

  Here, in the communication system according to the present invention, the predetermined base station information includes position information of each base station and correlation information between a distance from each base station and a radio wave intensity, and the predetermined scheme includes at least A method of calculating from the locus of the position of the mobile information terminal device obtained by three-point surveying based on the distance from the three base stations to the mobile information terminal device can be adopted.

  A communication system according to the present invention is a communication system between a mobile information terminal device and an information terminal device capable of making an IP call via a plurality of mobile communication networks and an IP network, and the information terminal device is connected via an IP network. Connected to the center side server, and the mobile information terminal device can communicate with the center side server via a mobile communication network and an IP network, and the center side server is measured in advance by the mobile information terminal device for a predetermined time. A trajectory of radio field intensity from a base station of a mobile communication network transmitted to the center side server, a base station selected by the base station and the mobile information terminal device after transmission and switched by the center side server; and It has an analysis recording unit that records the correlation between the switched base station and the mobile information terminal device that has been notified from the mobile information terminal device to the center server. The mobile information terminal device includes radio field intensity transmitting means for transmitting a radio field intensity trajectory from each base station of the plurality of mobile communication networks measured for a predetermined time to the center-side server at a predetermined timing; Analysis content request for requesting the analysis content of the analysis recording unit correlated with the locus of the radio wave intensity transmitted by the radio field intensity transmitting means to the center side server when the radio wave intensity from the base station in the center becomes weak And the analysis contents correlated with the trajectory of the radio field intensity transmitted by the radio field intensity transmitting unit by the center side server based on the request from the analysis unit and the analysis content request unit. The analyzed content is transmitted to the mobile information terminal device side, and based on the transmitted analyzed content, base station selecting means for selecting a base station to be switched to, and the base station selecting means Base station switching requesting means for requesting the center side server to switch to the base station selected by the base station, the center side server being transmitted by the radio field intensity transmitting means based on the request of the analysis content requesting means. The analysis contents correlated with the trajectory of the received radio field intensity are searched from the analysis recording unit, and the analysis contents transmission means for transmitting the searched analysis contents to the mobile information terminal device side, and the base station switching request means The base station requested to switch comprises base station switching means for switching communication between the mobile information terminal device and the information terminal device.

  Here, in the communication system of the present invention, the communication state recorded in the analysis recording unit can be recorded according to the moving speed of the mobile information terminal device calculated based on the trajectory of the radio wave intensity.

  Here, in the communication system of the present invention, the mobile information terminal apparatus notifies the center side server of a communication state between the base station switched by the base station switching means and the mobile information terminal apparatus. Can further be provided.

  A communication program according to the present invention is a communication program for a mobile information terminal device to communicate with an information terminal device capable of IP telephones via a plurality of mobile communication networks and an IP network. The mobile information terminal device is capable of communicating with the server via a mobile communication network and an IP network, and includes at least 3 mobile communication networks in which the mobile information terminal device is located. There are two mobile communication networks in the vicinity of the mobile information terminal device, the server has a base station information recording unit that records predetermined base station information, and a computer of the mobile information terminal device Radio field intensity measuring means for measuring radio field intensity from each base station of the mobile communication network for a predetermined time, base station information requesting means for requesting the server for predetermined base station information relating to each base station, and radio field intensity measuring means Yo Based on the radio field intensity from each base station measured for a predetermined time and the predetermined base station information recorded in the base station information recording unit transmitted by the server based on the request by the base station information requesting unit, A movement trajectory calculating means for calculating a movement trajectory of the mobile information terminal apparatus at a predetermined time by a predetermined method, and a base for selecting a base station satisfying a predetermined base station selection condition based on the movement trajectory calculated by the movement trajectory calculating means A communication program for functioning as a base station switching request means for requesting the server to switch to the base station selected by the base station selecting means, the base requested to be switched by the server; The communication between the mobile information terminal device and the information terminal device is switched to a station.

  Here, in the communication program of the present invention, when the predetermined base station selection condition assumes that the mobile information terminal device moves in the extension direction of the movement trajectory calculated by the movement trajectory calculation means, the extension direction The condition for selecting the base station that maximizes the radio field intensity can be used.

  Here, in the communication program according to the present invention, when the predetermined base station selection condition assumes that the mobile information terminal device moves in an extension direction of the movement trajectory calculated by the movement trajectory calculation means, the movement trajectory In accordance with the moving speed of the mobile information terminal device calculated based on the above, the condition for selecting the base station that maximizes the radio field intensity in the extending direction can be set.

  Here, in the communication program of the present invention, the predetermined base station information includes position information of each base station and correlation information between a distance from each base station and a radio wave intensity, and the predetermined method includes at least A method of calculating from the locus of the position of the mobile information terminal device obtained by three-point surveying based on the distance from the three base stations to the mobile information terminal device can be adopted.

  The communication program of the present invention is a communication program for communication between a mobile information terminal device and an information terminal device capable of IP telephones via a plurality of mobile communication networks and an IP network. The mobile information terminal device is connected to a server via a network, and the mobile information terminal device can communicate with the server via a mobile communication network and an IP network, and includes at least a mobile communication network in which the mobile information terminal device is located. Three mobile communication networks exist in the vicinity of the mobile information terminal device, the server has a base station information recording unit that records predetermined base station information, and the server computer is connected to the mobile information terminal. Base station information transmitting means for transmitting predetermined base station information recorded in a base station information recording unit to the mobile information terminal device side based on a request from the device, a plurality of times measured by the mobile information terminal device for a predetermined time of Based on the radio field intensity from each base station of the mobile communication network and the predetermined base station information transmitted by the base station information transmitting means, the movement trajectory of the mobile information terminal device at the predetermined time is determined in a predetermined manner. A base station that satisfies the predetermined base station selection condition is selected based on the movement trajectory calculated, the server is requested to switch to the selected base station, and the mobile information terminal device is requested to the base station requested to switch. And a communication program for functioning as base station switching means for switching communication between the information terminal device and the information terminal device.

  A communication program according to the present invention is a communication program for a mobile information terminal device to communicate with an information terminal device capable of IP telephones via a plurality of mobile communication networks and an IP network. The mobile information terminal device is communicable with the center server via a mobile communication network and an IP network, and the center server is previously connected by the mobile information terminal device for a predetermined time. The trajectory of the radio field intensity from the base station of the mobile communication network measured and transmitted to the center side server, the base station and the base station selected by the mobile information terminal device after transmission and switched by the center side server , An analysis record in which the communication state between the switched base station and the mobile information terminal device and the one notified from the mobile information terminal device to the center-side server is correlated and recorded The mobile information terminal device computer transmits, to the center side server at a predetermined timing, a trajectory of radio wave intensity from each base station of the plurality of mobile communication networks measured for a predetermined time. When the radio wave intensity from the radio field intensity transmitting means and the base station in the area becomes weak, the analysis of the analysis recording unit correlated with the locus of the radio wave intensity transmitted by the radio field intensity transmitting means to the center side server Analysis content requesting means for requesting content, and based on the request by the analysis content requesting means, the analysis content correlated with the trajectory of the radio field intensity transmitted by the radio field intensity transmitting unit by the center side server is the analysis recording unit. The base station selection means for selecting the base station to be switched to based on the transmitted analysis contents. , A communication program for causing a switch to a base station selected by the base station selecting means to function as a base station switching request means for requesting the center side server, the base station requested to switch by the server The communication between the mobile information terminal device and the information terminal device is switched.

  Here, in the communication program of the present invention, the communication state recorded in the analysis recording unit can be recorded according to the moving speed of the mobile information terminal device calculated based on the trajectory of the radio wave intensity.

  Here, in the communication program of the present invention, the mobile information terminal apparatus notifies the center side server of a communication state between the base station switched by the base station switching means and the mobile information terminal apparatus. Can further be provided.

  The communication program of the present invention is a communication program for communication between a mobile information terminal device and an information terminal device capable of IP telephones via a plurality of mobile communication networks and an IP network. The mobile information terminal device is connected to the center side server via a network, and the mobile information terminal device can communicate with the center side server via a mobile communication network and an IP network. The trajectory of the radio field intensity from the base station of the mobile communication network measured and transmitted to the center side server, the base station selected by the mobile information terminal device after transmission and switched by the center side server and the mobile information An analysis recording unit that records a correlation between a communication state with a terminal device and a notification sent from the mobile information terminal device to the center-side server; The mobile information terminal device transmits a radio field intensity trajectory from each base station of the plurality of mobile communication networks measured for a predetermined time by the mobile information terminal device to the center side server at a predetermined timing. When the radio field intensity from the station becomes weak, the center side server is requested to transmit a communication state correlated with the transmitted radio field intensity trajectory, and based on the request, the transmitted radio field intensity trajectory A communication state transmitting means for searching the correlated recording state from the analysis recording unit, and transmitting the searched communication state to the mobile information terminal device side, and the mobile information terminal device by the communication state transmitting means. Based on the communication state transmitted to the information terminal device, a base station to be switched to is selected, switching to the selected base station is requested to the center side server, and switching is requested. A communication program for functioning as a base station switching means for switching the communication between the mobile information terminal device to the earth station and the information terminal apparatus.

  The recording medium of the present invention is a computer-readable recording medium on which the communication program according to any one of claims 8 to 16 is recorded.

  A communication method according to the present invention is a communication method from a mobile information terminal device to an information terminal device capable of IP telephone communication via a plurality of mobile communication networks and an IP network, and the information terminal device is connected via an IP network. The mobile information terminal device is connected to a server, can communicate with the server via a mobile communication network and an IP network, and includes at least three mobile communication networks including the mobile communication network in which the mobile information terminal device is located. A communication network exists in the vicinity of the mobile information terminal device, and the mobile information terminal device measures the radio field strength from each base station of the plurality of mobile communication networks for a predetermined time; and A base station information requesting step for requesting predetermined base station information relating to each base station to the server, and predetermined base station information recorded in the base station information recording unit by the server based on the request of the base station information requesting step The transfer A base station information transmission step for transmitting to the information terminal device side, and the mobile information terminal device is transmitted in the base station information transmission step for the radio field strength from each base station measured for a predetermined time in the radio field strength measurement step. Based on predetermined base station information, a movement trajectory calculating step of calculating a movement trajectory of the mobile information terminal device at the predetermined time by a predetermined method, and a predetermined base based on the movement trajectory calculated in the movement trajectory calculating step A base station selection step for selecting a base station satisfying a station selection condition, a base station switching request step for requesting the server to switch to the base station selected in the base station selection step, and the server comprising the base station A base station switching step of switching communication between the mobile information terminal device and the information terminal device to the base station requested to be switched in the switching request step. And said that there were pictures.

  Here, in the communication method of the present invention, when the predetermined base station selection condition assumes that the mobile information terminal device moves in the extension direction of the movement trajectory calculated in the movement trajectory calculation step, the extension direction The condition for selecting the base station that maximizes the radio field intensity can be used.

  Here, in the communication method according to the present invention, when the predetermined base station selection condition assumes that the mobile information terminal device moves in an extension direction of the movement locus calculated in the movement locus calculation step, the movement locus In accordance with the moving speed of the mobile information terminal device calculated based on the above, the condition for selecting the base station that maximizes the radio field intensity in the extending direction can be set.

  Here, in the communication method of the present invention, the predetermined base station information includes position information of each base station and correlation information between a distance from each base station and a radio wave intensity, and the predetermined method includes at least A method of calculating from the locus of the position of the mobile information terminal device obtained by three-point surveying based on the distance from the three base stations to the mobile information terminal device can be adopted.

  A communication method according to the present invention is a communication method from a mobile information terminal device to an information terminal device capable of IP telephone communication via a plurality of mobile communication networks and an IP network, and the information terminal device is connected via an IP network. The mobile information terminal device is connected to a center side server and can communicate with the center side server via a mobile communication network and an IP network. The center side server is measured in advance by the mobile information terminal device for a predetermined time and The trajectory of the radio field intensity from the base station of the mobile communication network transmitted to the center side server, the base station and the base station selected by the mobile information terminal device after transmission and switched by the center side server, and the switching An analysis recording unit that records and records the communication state between the received base station and the mobile information terminal device and the information notified from the mobile information terminal device to the center-side server; The transfer A radio field intensity transmitting step in which the information terminal device transmits a radio field intensity trajectory from each base station of the plurality of mobile communication networks measured at a predetermined time to the center side server at a predetermined timing; When the radio field intensity from the station becomes weak, an analysis content requesting step for requesting the analysis content of the analysis recording unit correlated with the locus of the radio field intensity transmitted in the radio field intensity transmission step to the center side server; Based on the request of the analysis content requesting step, the center side server searches the analysis recording unit for the analysis content correlated with the trajectory of the radio wave intensity transmitted in the radio wave intensity transmitting step, and the searched analysis An analysis content transmission step for transmitting content to the mobile information terminal device side, and the mobile information terminal device based on the analysis content transmitted in the analysis content transmission step. A base station selecting step for selecting a switching destination base station, a base station switching requesting step for requesting the center side server to switch to the base station selected in the base station selecting step, and the center side server, And a base station switching step of switching communication between the mobile information terminal device and the information terminal device to the base station requested to switch in the base station switching request step.

  Here, in the communication method of the present invention, the communication state recorded in the analysis recording unit can be recorded according to the moving speed of the mobile information terminal device calculated based on the trajectory of the radio wave intensity.

  Here, the communication method according to the present invention may further include a notification step of notifying the center side server of a communication state between the switched base station and the mobile information terminal device following the base station switching step. it can.

  According to the communication system and the like of the present invention, the radio wave intensity measuring unit of the mobile phone measures the radio wave intensity from each base station of a plurality of mobile communication networks for a predetermined time. The base station information request unit requests predetermined base station information regarding each base station from the server. The movement trajectory calculation unit is a predetermined base recorded in the base station information DB transmitted by the server based on the radio field intensity from each base station measured by the radio field intensity measurement unit for a predetermined time and the request from the base station information request unit. Based on the station information, the movement trajectory of the mobile phone at a predetermined time is calculated by a predetermined method. The base station selection unit selects a base station that satisfies a predetermined base station selection condition based on the movement trajectory calculated by the movement trajectory calculation unit. As a predetermined base station selection condition, when it is assumed that the mobile phone moves in the extension direction of the movement trajectory calculated by the movement trajectory calculation unit, the base station having the maximum radio wave intensity in the extension direction is selected. It is preferable to use conditions. That is, the base station selection unit selects a base station from which radio waves are likely to become strong in the future, instead of the base station having the strongest radio waves, at a position deviating from the area of the base station. Since frequent switching of base stations will result in degradation of communication quality, it is possible to avoid frequent switching of base stations by selecting a base station where radio waves are likely to become stronger. Can be kept in. The predetermined base station selection condition may be a condition for selecting a base station having the maximum radio field intensity in the extension direction according to the moving speed of the mobile phone calculated based on the movement trajectory. The base station switching request unit requests the server to switch to the base station selected by the base station selecting unit. The base station information transmitting unit of the server transmits predetermined base station information recorded in the base station information DB to the mobile phone side based on a request from the base station information requesting unit. The base station switching unit switches communication between the mobile phone and the IP phone to the base station requested to be switched by the base station switching request unit. As a result, when the MVNO provides a base station switching service in which a plurality of mobile communication networks are used by one mobile station, the MNO manages even a mobile station not equipped with a GPS unit. It is possible to estimate the position, speed, and moving direction of the mobile station without requiring the position information of the mobile station, and it is possible to select the optimum switching destination base station.

  Hereinafter, each embodiment will be described in detail with reference to the drawings.

  FIG. 1 shows a communication system 1 in Embodiment 1 of the present invention. In FIG. 1, reference numeral 50 is an IP (Internet Protocol) network, 12a is a router having a routing function and connected to the IP network 50, and 10a is a business of a telephone carrier A connected to the IP network 50 via the router 12a. The operator A side server, 14a is a mobile communication network such as a wide area network of the telephone operator A connected to the operator A side server 10a, 16a is a base station connected to the mobile communication network 14a, and 20 is a mobile phone It is assumed that the mobile information terminal apparatus is in the area of the base station 16a. Examples of the IP network 50 include a closed IP network such as an IP-VPN (Virtual Private Network) and a wide area Ethernet (registered trademark) network, or the Internet. Since the operation layer of the wide area Ethernet (registered trademark) network is the second layer of OSI (Open Systems Interconnection), packets other than IP packets can be used, but here, the case of using IP packets is considered. . Similarly, reference numeral 12b is a router having a routing function and connected to the IP network 50, 10b is a server B side server of the telephone operator B connected to the IP network 50 via the router 12b, and 14b is the provider B. A mobile communication network such as a wide area network of the telephone carrier B connected to the side server 10b, 16b is a base station connected to the mobile communication network 14b. Similarly, reference numeral 12c is a router having a routing function and connected to the IP network 50, 10c is a server C side server of the telephone operator C connected to the IP network 50 via the router 12c, and 14c is the operator C. A mobile communication network such as a wide area network of the telephone operator C connected to the side server 10c, 16c is a base station connected to the mobile communication network 14c. Subsequently, reference numeral 12d is a router having a routing function and connected to the IP network 50, 10d is a server D side server of the telephone operator D connected to the IP network 50 via the router 12d, and 14d is the operator D. A mobile communication network such as a wireless LAN of the telephone carrier D connected to the side server 10d, 16d is an access point connected to the mobile communication network 14d. Reference numeral 49 is a router having a routing function and connected to the IP network 50, 40 is a server connected to the IP network 50 via the router 49, and 52 is a routing function corresponding to an IP telephone and connected to the IP network 50. An IP telephone router 54 is an IP telephone (an information terminal capable of IP telephone) connected to the IP network 50 via the IP telephone router 52. The IP telephone 54 is a normal telephone, but may be a personal computer PC or the like. As shown in FIG. 1, the communication system 1 includes a mobile phone 20, a plurality of mobile communication networks 14a, 14b, 14c, and 14d (hereinafter referred to as “mobile communication network 14a etc.”) and an IP network. 50, a server 40 capable of communicating with the mobile phone 20 via the IP 50, and an IP phone 54 connected to the server 40 via the IP network 50. As shown in FIG. 1, three mobile communication networks 14 b, 14 c, and 14 d except for the mobile communication network 14 a in which the mobile phone 20 is located exist in the vicinity of the mobile phone 20. However, as will be described later, the movement trajectory calculation unit 24 obtains the position of the mobile phone 20 by three-point surveying based on the distances from at least three base stations, so that the mobile communication network 14a in which the mobile phone 20 is located is located. At least three mobile communication networks including the mobile communication networks 14c and 14d need only exist in the vicinity of the mobile phone device 20.

  Next, functions of the mobile phone device 20 will be described. In FIG. 1, reference numeral 21 denotes a functional block indicating the function of the mobile phone device 20. The mobile phone device 20 includes a radio wave intensity measuring unit (radio wave intensity measuring unit) 22 and a base station information requesting unit (base station information requesting unit). ) 23, a movement trajectory calculation unit (movement trajectory calculation unit) 24, a base station selection unit (base station selection unit) 25, and a base station switching request unit (base station switching request unit) 26.

  The radio wave intensity measuring unit 22 measures the radio wave intensity from each of the base stations 16a, 16b, 16c, 16d (hereinafter referred to as “base station 16a etc.”) such as a plurality of mobile communication networks 14a for a predetermined time. The predetermined time is preferably about 6 to 7 seconds, for example, but is not limited to about 6 to 7 seconds. FIG. 2 shows a state in which the mobile phone 20 moves in each area such as the base station 16a. In FIG. 2, the same reference numerals as those in FIG. In FIG. 2, reference numerals 18a, 18b, 18c, and 18d denote areas such as the base station 16a. As shown in FIG. 2, it is assumed that the mobile phone 20 moves along the direction indicated by the arrow P every second in the order of positions p1, p2, p3, p4, p5, p6 and p7. FIG. 3 is a radio wave intensity change table 60 showing a change in radio wave intensity from the base station 16a and the like measured by the radio wave intensity measuring unit 22 for a predetermined time when the mobile phone 20 moves as shown in FIG. . In FIG. 3, reference numeral 80 is an elapsed time column indicating the elapsed time from a desired time point, and 81, 82, 83, and 84 are area 18 a columns indicating the radio wave intensity from each base station 16 a and the like measured by the radio wave intensity measuring unit 22. , Area 18b column, area 18c column, and area 18d column. The radio wave intensity is indicated by a relative radio wave intensity index, and is assigned such that 1 is minimum and 10 is maximum. 0 is when there is no radio wave intensity. The value of the elapsed time column 80 in the row 61 is 31 seconds, which is the elapsed time until the mobile phone 20 arrives at the position p1 shown in FIG. 2 from the desired position. Similarly, the value of the elapsed time column 80 in the lines 62 to 67 is 32 seconds to 37 seconds, which is the elapsed time until the mobile phone 20 arrives at the positions p2 to p7 shown in FIG. As shown in FIG. 3, for example, in the row 61, the elapsed time until the mobile phone 20 arrives at the position p1 is 31 seconds. At that time, from the base stations 16a and the like measured by the radio wave intensity measuring unit 22 The radio wave intensity (radio wave intensity index) is 6, 0, 0, and 0, respectively, as shown in the area 18a column 81 to the area 18d column 84. This indicates a state in which the mobile phone 20 receives radio waves only from the base station 16a and does not receive radio waves from the other base stations 16b, 16c, 16d. As shown in line 62, when moving from position p1 to p2, the value in area 18b column 82 is changed from 0 to 1, and mobile phone 20 is ready to receive radio waves not only from base station 16a but also from base station 16b. It shows that. Since the same applies to the following, description of the other rows 63 and the like is omitted.

  The base station information request unit 23 requests the server 40 for predetermined base station information regarding each base station 16a and the like. As shown in FIG. 1, the predetermined base station information is recorded in a base station information database (DB) (base station information recording unit) 45 in a recording device 44 such as a disk of the server 40. Details of the predetermined base station information will be described later.

  The movement trajectory calculation unit 24 stores in the base station information DB 45 transmitted by the server 40 based on the radio field intensity from each base station 16a measured by the radio field intensity measurement unit 22 for a predetermined time and the request from the base station information request unit 23. Based on the recorded predetermined base station information, the movement trajectory of the mobile phone 20 at a predetermined time is calculated by a predetermined method. The predetermined base station information includes position information (position coordinates) of each base station 16a and the like, and correlation information between the distance (r) from each base station 16a and the like to the mobile phone 20 and the radio wave intensity (I). Including. FIG. 4 is a graph I (r) showing correlation information between the distance (r) from the base station 16b to the mobile phone 20 and the radio wave intensity (I). In FIG. 4, the horizontal axis represents distance (r), and the vertical axis represents radio wave intensity (I). As shown in FIG. 4, when the radio field intensity (Ib) from the base station 16b at a certain point in time measured on the mobile phone 20 side is known, the graph I (r) indicates the cell phone from the base station 16b at that point in time. The distance (rb) up to 20 can be known. Similar correlation information is included in the predetermined base station information for the other base stations 16a, 16c and 16d. Therefore, as shown in the radio wave intensity change table 60 in FIG. 3, the radio wave intensity (Ia,) from each base station 16a and the like at a certain point in time (a line in the wave intensity change table 60) measured on the mobile phone 20 side. If Ib, Ic, Id) is known, the distance (ra, rb, rc, rd) from each base station 16a etc. to the mobile phone 20 at that time can be known from each graph I (r). As a predetermined method in which the movement trajectory calculation unit 24 calculates the movement trajectory of the mobile phone 20 at a predetermined time, the distance from the base station 16a or the like that can be known from the correlation information I (r) to the mobile phone 20 is determined. It is preferable to use a method of calculating at least three base stations and calculating from the locus of the position of the mobile phone 20 obtained by triangulation based on these three distances.

  The base station selection unit 25 selects a base station that satisfies a predetermined base station selection condition based on the movement trajectory calculated by the movement trajectory calculation unit 24. As a predetermined base station selection condition, when it is assumed that the mobile phone 20 moves in the extension direction of the movement locus calculated by the movement locus calculation unit 24, the base station having the maximum radio field intensity in the extension direction is selected. It is preferable that the conditions are selected. FIG. 5 is a diagram for explaining predetermined base station selection conditions. In FIG. 5, the same reference numerals as those in FIG. As shown in FIG. 5, at the position p7, the distance between the mobile phone 20 and the base station 16b is rb7, and the distance rb7 is shorter than the distance rd7 between the mobile phone 20 and the base station 16d. Accordingly, the radio wave intensity measured by the mobile phone 20 at the position p7 deviating from the area 18a of the base station 16a is greater from the base station 16d than from the base station 16d. For this reason, in the prior art, the base station 16a is switched to the base station 16b having a good radio wave condition. On the other hand, the base station selection unit 25 extends the direction of the arrow P (indicated by the arrow P ′) that is the locus (movement locus) of the position of the mobile phone 20 calculated by the movement locus calculation unit 24 as described above. It is assumed that the mobile phone 20 moves. Then, for example, when considering a position pi in the extension direction P ′, the distance between the mobile phone 20 and the base station 16b is rbi at the position pi, and the distance rbi is between the mobile phone 20 and the base station 16d. Longer than the distance rdi. Accordingly, the radio wave condition from the base station 16d is better than the radio wave condition from the base station 16b at the position pi. Therefore, the base station selection unit 25 selects the base station 16d having the maximum radio wave intensity at the position pi on the extension direction P ′ of the movement locus P at the position p7 in a state of deviating from the area 18a of the base station 16a. That is, not the base station 16b with the strongest radio wave at the position p7 but the base station 16d with which the radio wave is likely to become strong is selected. In the case as shown in FIG. 2, even if switching to the base station 16b at the position p7, it may be necessary to switch to the base station 16c or 16d immediately. Since frequent switching of base stations results in deterioration of communication quality, as described above, it is possible to avoid frequent switching of base stations by selecting the base station 16d that is likely to have a strong radio wave. Communication quality can be kept stable.

  As described above, the position (coordinates) p1 and the like can be obtained by three-point surveying, and the movement trajectory P calculated by the movement trajectory calculation unit 24 is a change in position every second. The moving speed of the cellular phone 20 can be obtained from the rate of change. Therefore, the predetermined base station selection condition is based on the movement locus P when it is assumed that the mobile phone 20 moves in the extension direction P ′ of the movement locus P calculated by the movement locus calculation unit 24 as described above. Depending on the moving speed of the mobile phone 20 calculated in this way, a condition for selecting a base station having the maximum radio field intensity in the extension direction P ′ may be used. In the case as shown in FIG. 2, in the case where the mobile phone 20 is mounted on a car or the like, the moving speed is fast, so even if switching to the base station 16b at the position p7, switching to the base station 16c or 16d is immediately performed. There may be a need. Therefore, according to the moving speed of the mobile phone 20, it is possible to avoid frequent switching of the base station by selecting a base station where radio waves are likely to become stronger, and to maintain stable communication quality. .

  Returning to FIG. 1, the base station switching request unit 26 requests the server 40 to switch to the base station selected by the base station selection unit 25. Each function of the cellular phone 20 described above is preferably realized by software, but part or all of the functions can also be realized by hardware.

  Next, functions of the server 40 will be described. In FIG. 1, reference numeral 41 denotes a functional block indicating the function of the server 40, and the server 40 includes a base station information transmission unit (base station information transmission unit) 42 and a base station switching unit (base station switching unit) 43. ing. Based on the request from the base station information request unit 23, the base station information transmission unit 42 transmits predetermined base station information recorded in the base station information DB 45 to the mobile phone 20 side. The base station switching unit 43 switches communication between the mobile phone 20 and the IP phone 54 to the base station requested to be switched by the base station switching request unit 26.

  FIG. 6 is a flowchart showing the flow of the communication program or communication method according to the first embodiment of the present invention. In FIG. 6, the flowchart on the left side shows the process on the mobile phone 20 side, the flowchart on the right side shows the process on the server 40 side, and communication between the two is indicated by a dotted line between the flowcharts. As shown in FIG. 6, the cellular phone 20 measures the radio field intensity from each base station 16 a and the like such as a plurality of mobile communication networks 14 a for a predetermined time (radio field intensity measurement step, step S 10). The server 40 is requested for predetermined base station information BINF relating to each base station 16a and the like (base station information requesting step, step S12).

  Based on the request of the base station information request step (step S12), the server 40 transmits predetermined base station information BINF recorded in the base station information DB 45 to the mobile phone 20 side (base station information transmission step, step S20). ).

  The mobile phone 20 receives the radio field intensity from each base station 16a and the like measured in the radio field intensity measurement step (step S10) and the predetermined base station information BINF transmitted in the base station information transmission step (step S20). Based on the above, the movement trajectory of the mobile phone 20 at a predetermined time is calculated by a predetermined method (movement trajectory calculating step, step S14). Based on the movement trajectory calculated in the movement trajectory calculation step (step S14), a base station satisfying a predetermined base station selection condition is selected (base station selection step, step S16). The server 40 is requested to switch to the base station selected in the base station selection step (step S16) (base station switching request step, step S18).

  The server 40 switches communication between the mobile phone 20 and the IP telephone 54 to the base station requested to be switched in the base station switching request step (step S18) (base station switching step, step S22).

  As described above, according to the first embodiment of the present invention, the radio field intensity measuring unit 22 of the mobile phone 20 measures the radio field intensity from each base station 16a such as the plurality of mobile communication networks 14a for a predetermined time. The base station information request unit 23 requests the server 40 for predetermined base station information regarding each base station 16a and the like. The movement trajectory calculation unit 24 stores in the base station information DB 45 transmitted by the server 40 based on the radio field intensity from each base station 16a measured by the radio field intensity measurement unit 22 for a predetermined time and the request from the base station information request unit 23. Based on the recorded predetermined base station information, the movement trajectory of the mobile phone 20 at a predetermined time is calculated by a predetermined method. The predetermined base station information includes position information (position coordinates) of each base station 16a and the like, and correlation information I between the distance (r) from each base station 16a and the like to the mobile phone 20 and the radio wave intensity (I). (R) is included. As a predetermined method, the distance from the base station 16a or the like that can be known from the correlation information I (r) to the mobile phone 20 is obtained for at least three base stations, and is obtained by three-point surveying based on these three distances. It is preferable to use a method of calculating from the locus of the position of the mobile phone 20 that has been obtained. The base station selection unit 25 selects a base station that satisfies a predetermined base station selection condition based on the movement trajectory calculated by the movement trajectory calculation unit 24. As a predetermined base station selection condition, when it is assumed that the mobile phone 20 moves in the extension direction P ′ of the movement locus P calculated by the movement locus calculation unit 24, the radio field intensity is maximum in the extension direction P ′. It is preferable to use the condition for selecting the base station to be. Considering the position pi on the extension direction P ', the radio wave condition from the base station 16d is better than the radio wave condition from the base station 16b at the position pi. Therefore, the base station selection unit 25 selects the base station 16d from which the radio wave is likely to become stronger, not the base station 16b having the strongest radio wave, at the position p7 deviating from the area 18a of the base station 16a. Since frequent switching of base stations results in deterioration of communication quality, as described above, it is possible to avoid frequent switching of base stations by selecting the base station 16d that is likely to have a strong radio wave. Communication quality can be kept stable. The predetermined base station selection condition may be a condition for selecting the base station having the maximum radio wave intensity in the extension direction P ′ according to the moving speed of the mobile phone 20 calculated based on the movement locus P. . The base station switching request unit 26 requests the server 40 to switch to the base station selected by the base station selecting unit 25. Based on the request from the base station information request unit 23, the base station information transmission unit 42 of the server 40 transmits predetermined base station information recorded in the base station information DB 45 to the mobile phone 20 side. The base station switching unit 43 switches communication between the mobile phone 20 and the IP phone 54 to the base station requested to be switched by the base station switching request unit 26.

  As described above, based on the radio field intensity measured for a predetermined time from the plurality of base stations 16a and the like by the radio field intensity measuring unit 22 and the predetermined base station information regarding each base station 16a and the like transmitted from the server 40, the movement trajectory calculation unit 24 calculates the movement trajectory P of the mobile phone 20 at a predetermined time by a predetermined method, and the base station selection unit 25 assumes that the mobile phone 20 moves in the extension direction P ′ of the movement trajectory P. By selecting the base station having the maximum radio wave intensity in the direction P ′, it is possible to select not the base station 16b with the strongest radio wave but the base station 16d with which the radio wave is likely to become strong in the future. Therefore, when the MVNO provides a base station switching service in which a plurality of mobile communication networks are used by one mobile station, even if the mobile station does not have a GPS unit, the mobile managed by the MNO The position, speed, and direction of movement of the mobile station can be estimated without requiring station position information, and an optimal switching destination base station can be selected.

  In the second embodiment, an example will be described in which an optimal switching destination base station is selected when position information of each base station 16a such as the predetermined base station information BINF is not given. FIG. 7 shows a communication system 2 in Embodiment 2 of the present invention. In FIG. 7, the same reference numerals as those in FIG. Similar to the communication system 1 according to the first embodiment, the communication system 2 includes a mobile phone 30, a center-side server 90 that can communicate with the mobile phone 30 via the plurality of mobile communication networks 14 a and the IP network 50. And an IP telephone 54 connected to the center server 90 via the IP network 50. In FIG. 7, it is assumed that the mobile phone 30 is in the mobile communication network 14a as in FIG. However, in the communication system 2, since the location information of each base station 16a and the like is not given, three-point surveying cannot be used. Accordingly, as in the first embodiment, the three mobile communication networks 14b, 14c and 14d excluding the mobile communication network 14a (among these, the mobile communication networks 14b and 14c are the same telephone company) are included in the cellular phone 20 However, this is merely a setting for convenience.

  Next, functions of the mobile phone 30 will be described. In FIG. 7, reference numeral 31 is a functional block showing the function of the mobile phone 30. The mobile phone 30 includes a radio wave intensity transmitting unit (radio wave intensity transmitting unit) 32 and an analysis content requesting unit (analysis content requesting unit) 33. A base station selection unit (base station selection unit) 34, a base station switching request unit (base station switching request unit) 35, and a notification unit (notification unit) 36.

  The radio field intensity transmitting unit 32 uses the radio field trajectory in the recording device 37 of the mobile phone 30 shown in FIG. 7 to show the trajectory of the radio field intensity from each base station 16a of the plurality of mobile communication networks 14a and the like measured for a predetermined time. It is recorded in a log (file) 38 and transmitted (uploaded) to the center server 90 at a predetermined timing. The predetermined timing is preferably a periodic timing. FIG. 8 shows a state where the mobile phone 30 moves in each area such as the base station 16a as in FIG. In FIG. 8, the portions denoted by the same reference numerals as those in FIGS. 8 moves from position p1 to p7 in the same manner as the direction of arrow P shown in FIG. 2, and then moves from position P8, which is the direction shown by arrow Q, to p13 every second. The symbol R indicates an obstacle such as a river that prevents the arrow P from proceeding in the extending direction. 9 is similar to FIG. 3, when the mobile phone 30 moves as shown in FIG. 8, the radio wave intensity transmitting unit 32 displays the radio wave track log 38 for uploading to the center server 90 at a predetermined timing. A radio wave intensity change table 70 showing changes in radio wave intensity from the recorded base station 16a and the like is shown. In FIG. 9, the columns and lines denoted by the same reference numerals as those in FIG. The radio wave intensity is indicated by a relative radio wave intensity index as in the case of FIG.

  Here, the analysis database (DB) (analysis recording unit) 95 of the center server 90 will be described first. A locus of radio field intensity (for example, radio wave intensity change table 70 as shown in FIG. 9) from the base station 16a such as the mobile communication network 14a measured in advance for a predetermined time by a plurality of mobile phones 30 is a center side server. 90. Further, the communication state between the base station selected by the mobile phone 30 after the transmission and switched by the center server 90 and the mobile phone 30 (a value indicating whether or not the communication state is good as a result of switching) is also provided. This is notified to the center side server 90. The correlation of the trajectory of the radio wave intensity, the switching source and switching destination base stations, and the communication state is analyzed by an analysis unit (not shown) of the center server 90 and recorded in the analysis DB 95. That is, the communication state such as whether the radio wave condition with the selected base station is good or bad with respect to various radio wave intensity trajectories uploaded from a plurality of mobile phones is the center side server 90. Is recorded in the analysis DB 95 in correspondence with the trajectory of the radio field intensity, the switching source and switching destination base stations, and the communication state. Later, when a radio field intensity trajectory similar to that recorded in the analysis DB 95 is measured in the cellular phone 30 (or another cellular phone), the center side server 90 is inquired about collation of the radio field intensity trajectory, By obtaining the corresponding switching source and switching destination base stations and communication states (analysis contents of the analysis recording unit), it is possible to select a base station that can obtain an optimum radio wave state.

  FIG. 10 shows the radio field intensity trajectory recorded in association with the analysis DB, the switching source and switching destination base stations and the communication status, and the switching source and switching destination base stations and the communication status (analysis contents of the analysis recording unit). An analysis table 100 is shown as an example. The trajectory of the radio wave intensity corresponding to the analysis table 100 is, for example, the radio wave intensity change table 70 shown in FIG. In FIG. 10, reference numeral 104 denotes a base station column indicating a switching source and a switching destination base station, and 105 denotes a communication state column indicating a communication state after switching. The communication state includes a high speed column 105a indicating a speed corresponding to a train or a car, a medium speed column 105 indicating a speed corresponding to a bicycle or a walking, and the like according to the moving speed of the mobile phone 30 calculated based on the trajectory of the radio wave intensity. It can be recorded like a low speed column 105c indicating a speed equivalent to walking or stationary. The analysis unit of the center server 90 can obtain the moving speed from the rate of change of the radio wave intensity. The value in the analysis table 100 indicates the stable communication index after switching, and the analysis unit allocates from 1 which is unstable to 10 which is stable. The stable communication index is an analysis unit that shows how stable the communication has been in the past when switching from a base station to another base station (for example, an error rate for 1 minute after switching). This is a summary and analysis.

  Assuming that the radio field intensity trajectories as shown in the radio field intensity change tables 60 to 70 have been measured in the past, for example, when switching from the base station 16a to 16b at the position p7 shown in FIG. The row 101 is 1 (unstable) when the moving speed of the mobile phone 30 is the speed shown in the high speed column 105a, and the moving speed of the mobile phone 30 is shown in the medium speed column 105b. The speed is 5 (relatively stable), and the moving speed of the mobile phone 30 is 8 (substantially stable) when the moving speed is as shown in the low speed column 105c. As shown in FIG. 8, when the moving speed of the mobile phone 30 is high at the position p7, it is necessary to switch to the base station 16c immediately after switching to the base station 16b. It was analyzed by the analysis unit as being unstable. On the other hand, when the moving speed of the mobile phone 30 is low at the position p7, it is not necessary to switch to the other base station 16c immediately after switching to the base station 16b, so that the communication state is quite stable. It has been analyzed. The row 102 of the analysis table 100 indicates that the stable communication index according to the moving speed of the mobile phone 30 does not change much when switching from the base station 16a to 16c at the position p7. As shown in FIG. 8, when switching to the base station 16c at the position p7, the analysis unit analyzes that it is close to the base station 16c regardless of the mobile station speed of the mobile phone 30. . The row 103 of the analysis table 100 indicates that the stable communication index is unstable regardless of the moving speed of the mobile phone 30 when switching from the base station 16a to 16d at the position p7. As shown in FIG. 8, when switching to the base station 16d at the position p7, the analysis unit analyzes that it is far from the base station 16d regardless of the mobile station speed of the mobile phone 30. .

  When the radio wave intensity from the base station 16a in the area becomes weak, the analysis content requesting unit 33 analyzes the analysis DB 95 correlated with the locus of the radio wave intensity transmitted to the center server 90 by the radio wave intensity transmitting unit 32. Request the transmission of the analysis contents (analysis table 100, etc.).

  Based on the request from the analysis content request unit 33, the center server 90 searches the analysis DB 95 for the analysis content correlated with the trajectory of the radio wave intensity transmitted by the radio wave intensity transmission unit 32, as will be described later. The searched analysis content is transmitted to the mobile phone 30 side, and the base station selection unit 34 selects a switching destination base station based on the transmitted analysis content. For example, when the mobile phone 30 is at the position p7 shown in FIG. 8, when the moving speed is low or almost stationary based on the analysis table 100, the base station 16b is selected, and the moving speed is high. Selects the base station 16c.

  The base station switching request unit 35 requests the center side server 90 to switch to the base station selected by the base station selecting unit 34. The notification unit 36 notifies the center-side server 90 of the communication state between the base station switched by the base station switching unit 35 and the mobile phone 30. This notification is set as a communication state, and is associated with the trajectory of the radio wave intensity previously transmitted by the radio wave intensity transmitting unit 32, the switching source base station and the switching destination base station, and is subjected to a new analysis by the analyzing unit. It is repeated that the data is appropriately recorded in the analysis DB 95. Each function of the cellular phone 30 described above is preferably realized by software, but part or all of the functions can also be realized by hardware.

  Next, functions of the center side server 90 will be described. In FIG. 7, reference numeral 91 is a functional block showing the function of the center side server 90. The center side server 90 includes an analysis content transmission unit (analysis content transmission unit) 92 and a base station switching unit (base station switching request unit). 93.

  Based on the request of the analysis content requesting unit 33, the analysis content transmission unit 92 searches the analysis DB 95 for the analysis content correlated with the trajectory of the radio wave intensity transmitted by the radio wave intensity transmission unit 32. Is transmitted to the mobile phone 30 side.

  The base station switching unit 93 switches communication between the mobile phone 30 and the IP phone 54 to the base station requested to be switched by the base station switching request unit 35. In the above description, it has been described that one center-side server 90 has the function of the communication state transmission unit 92 and the function of the base station switching unit 93. However, different servers, for example, the analysis content transmission unit 92 The function may be provided in the radio wave intensity analysis server, and the function of the base station switching unit 93 may be provided in the optimum line switching server.

  FIG. 11 is a flowchart showing the flow of the communication program or communication method according to the second embodiment of the present invention. In FIG. 11, the flowchart on the left side shows the process on the mobile phone 30 side, the flowchart on the right side shows the process on the center side server 90, and communication between the two is indicated by a dotted line between the flowcharts. As shown in FIG. 11, the mobile phone 30 transmits the locus of the radio field intensity from each base station 16a such as a plurality of mobile communication networks 14a measured for a predetermined time to the center server 90 at a predetermined timing. (Radio field intensity transmission step. Step S30). When the radio field intensity from the base station 16a in the area becomes weak, the analysis contents of the analysis DB 95 correlated with the radio field intensity trajectory transmitted in the radio field intensity transmission step (step S30) are sent to the center side server 90. Request (analysis content request step. Step S32).

  Based on the request of the analysis content requesting step (step S32), the center side server 90 searches the analysis DB 95 for the analysis content correlated with the trajectory of the radio wave intensity transmitted in the radio wave intensity transmission step (step S30). The analysis content thus transmitted is transmitted to the mobile phone 30 (analysis content transmission step, step S40).

  The cellular phone 30 selects a base station to be switched based on the analysis content transmitted in the analysis content transmission step (step S40) (base station selection step, step S34). The center side server 90 is requested to switch to the base station selected in the base station selection step (step S34) (base station switching request step, step S36).

  The center-side server 90 switches communication between the portable telephone 30 and the IP telephone 54 to the base station requested to be switched in the base station switching request step (step S36) (base station switching step, step S42).

  The mobile phone 30 notifies the communication state between the switched base station and the mobile phone 30 (notification step, step S38).

  As described above, according to the second embodiment of the present invention, when position information such as each base station 16a such as predetermined base station information is not given, the mobile object measured in advance by a plurality of mobile phones 30 for a predetermined time. The trajectory of the radio wave intensity from the base station 16a such as the communication network 14a is transmitted to the center side server 90 in advance. After the transmission, the center side server 90 is also notified of the communication state between the base station selected by the mobile phone 30 and switched by the center side server 90 and the mobile phone 30. The radio wave intensity trajectory, the switching source and switching destination base stations, and the communication state are analyzed for correlation and recorded in the analysis DB 95. Later, when a radio field intensity trajectory similar to that recorded in the analysis DB 95 is measured in the cellular phone 30 (or another cellular phone), the center side server 90 is inquired about collation of the radio field intensity trajectory, By obtaining the corresponding switching source and switching destination base stations and communication states (analysis contents of the analysis recording unit), it can be used as a reference when selecting a base station that can obtain an optimal radio wave state.

  The radio wave intensity transmitting unit 32 of the mobile phone 30 records the trajectory of the radio wave intensity from each base station 16a such as the plurality of mobile communication networks 14a measured for a predetermined time, as shown in FIG. 37, and is uploaded to the center server 90 at a predetermined timing. When the radio wave intensity from the base station 16a in the area becomes weak, the analysis content requesting unit 33 analyzes the analysis DB 95 correlated with the locus of the radio wave intensity transmitted to the center server 90 by the radio wave intensity transmitting unit 32. Request the transmission of the analysis contents (analysis table 100, etc.). Based on the request from the analysis content request unit 33, the center server 90 searches the analysis DB 95 for analysis content correlated with the trajectory of the radio wave intensity transmitted by the radio wave intensity transmission unit 32. The searched analysis content is transmitted to the mobile phone 30 side, and the base station selection unit 34 selects a switching destination base station based on the transmitted analysis content. The base station switching request unit 35 requests the center side server 90 to switch to the base station selected by the base station selecting unit 34. The base station switching unit 93 of the center-side server 90 switches communication between the mobile phone 30 and the IP phone 54 to the base station requested to be switched by the base station switching request unit 35. The notification unit 36 notifies the center-side server 90 of the communication state between the base station switched by the base station switching unit 35 and the mobile phone 30. As described above, when the analysis content correlated with the locus of the radio wave intensity is recorded in the analysis DB 95, and later, the radio wave intensity locus similar to that recorded in the analysis DB 95 is measured by the mobile phone 30. By obtaining the corresponding analysis contents from the center-side server 90, it is possible to select a base station that can obtain an optimum radio wave state even when position information of each base station 16a or the like is not given. . Therefore, when the MVNO provides a base station switching service in which a plurality of mobile communication networks are used by one mobile station, even if the mobile station does not have a GPS unit, the mobile managed by the MNO The position, speed, and direction of movement of the mobile station can be estimated without requiring station position information, and an optimal switching destination base station can be selected.

  The communication system 1 described in the first embodiment and the communication system 2 described in the second embodiment can be used in combination. For example, when the location information of the base station 16a or the like is given, the switching destination base station is selected as described in the communication system 1, and then the analysis contents (analysis table 100 or the like as described in the communication system 2). ) Here, when there is a switching destination base station having a very high stable communication index, the base station is selected by the method described in the communication system 2. On the other hand, when the stable communication index is the same value, the base station can be selected by the method described in the communication system 1.

  FIG. 12 is a block diagram showing an internal circuit 110 of a computer such as the cellular phone 20 or 30 and the server 40 or 90 that executes the computer program of the present invention for realizing the above-described embodiments. As shown in FIG. 12, the CPU 111, ROM 112, RAM 113, image control unit 116, controller 117, input control unit 119, and external interface (I / F) unit 121 are connected to a bus 122. In FIG. 12, the above-described computer program of the present invention is recorded on a recording medium (including a removable recording medium) such as a ROM 112, a disk 118a (or 44), or a CD-ROM 118n. In the case of the cellular phone 20 or 30, the base station information DB 45 or the analysis DB 95 can be recorded on the disk 118a. The computer program of the present invention is loaded into the RAM 113 from the ROM 112 via the bus 122 or from a recording medium such as the disk 118a or CD-ROM 118n via the controller 117 via the bus 122. The input control unit 119 is connected to the input operation unit 120 such as a mouse and a numeric keypad in the case of the server 40 or 90 and the input operation unit 120 such as various keys in the case of the mobile phone 20 or 30, and performs input control. The VRAM 115 which is an image memory has a capacity corresponding to the data capacity of at least one screen of the display unit 114 of the mobile phone 20 or 30 or the server 40 or 90, and the image control unit 116 converts the data of the VRAM 115 into image data. It has a function of converting and sending it to the display unit 114. The external I / F unit 121 has an input / output interface function between the mobile communication network 14a and the IP network 50 and the like.

  As described above, the object of the present invention can be achieved by the CPU 111 executing the above-described computer program of the present invention. The computer program can be supplied to the computer CPU 111 in the form of a recording medium such as a CD-ROM 118n as described above, and a recording medium such as a CD-ROM 118n on which the computer program is recorded also constitutes the present invention. It will be. As the recording medium on which the computer program is recorded, for example, a memory card, a memory stick, a DVD, an optical disk, an FD, or the like can be used in addition to the recording medium described above.

  As an application example of the present invention, there is an application to a base station switching service in which a plurality of MNO mobile communication networks by MVNO are used by one mobile station.

It is a figure which shows the communication system 1 in Example 1 of this invention. It is a figure which shows the state which the portable telephone apparatus 20 moves each area, such as base station 16a. 2 is a radio wave intensity change table 60 showing a change in radio wave intensity from the base station 16a and the like measured by the radio wave intensity measuring unit 22 for a predetermined time when the mobile phone 20 moves as shown in FIG. It is graph I (r) which shows the correlation information between the distance (r) from the base station 16b to the mobile telephone device 20, and radio field intensity (I). It is a figure for demonstrating a predetermined base station selection condition. It is a flowchart which shows the flow of the communication program in Example 1 of this invention, or a communication method. It is a figure which shows the communication system 2 in Example 2 of this invention. It is a figure which shows the state which the mobile telephone 30 moves to each area, such as base station 16a, similarly to FIG. As in FIG. 3, when the mobile phone 30 moves as shown in FIG. 8, the radio wave intensity transmission unit 32 records the radio wave locus log 38 for uploading to the center server 90 at a predetermined timing. It is a figure which shows the radio wave intensity | strength change table 70 which shows the change of the radio field intensity from the base station 16a etc. FIG. It is a figure which shows the analysis table | surface 100 which is an example of the switching origin and switching destination base station and communication state among the locus | trajectory of the radio field intensity recorded corresponding to the analysis DB, the switching source and switching destination base stations, and the communication status. is there. It is a flowchart which shows the flow of the communication program in Example 2 of this invention, or a communication method. It is a block diagram which shows the internal circuit 110 of computers, such as the mobile telephone 20 or 30 and the server 40 or 90 which execute the computer program of this invention for implement | achieving each Example mentioned above.

Explanation of symbols

1, 2 communication system, 10a operator A side server, 10b operator B side server, 10c operator C side server, 10d operator D side server, 12a, 12b, 12c, 12d, 49 router, 14a, 14b, 14c , 14d mobile communication network, 16a, 16b, 16c base station, 16d access point, 18a, 18b, 18c, 18d area, 20, 30 mobile phone, 21, 31, 41, 91 function block, 22 radio wave intensity measuring unit , 23 base station information request unit, 24 movement trajectory calculation unit, 25, 34 base station selection unit, 26, 35 base station switching request unit, 32 radio field intensity transmission unit, 33 analysis content request unit, 36 notification unit, 37, 44 , 94 recording device, 38 radio wave trajectory log, 40 server, 42 base station information transmission unit, 43, 93 base station switching unit, 45 base station Information DB, 50 IP network, 52 IP telephone router, 54 IP telephone, 60, 70 radio wave intensity change table, 61, 62, 63, 64, 65, 67, 68, 69, 70, 71, 72, 73, 101 , 102, 103 rows, 80 elapsed time column, 81 area 18a column, 82 area 18b column, 83 area 18c column, 84 area 18d column, 90 center side server, 92 analysis content transmission unit, 100 analysis table, 105a high speed column 105b Medium speed column, 105c Low speed column, 110 Internal circuit, 111 CPU, 112 ROM, 113 RAM, 114 Display unit, 115 VRAM, 116 Image control unit, 117 Controller, 118a disk, 118n CD-ROM, 119 Input control Section, 120 input operation section, 121 external I / F section, 122 bus.

Claims (24)

A communication system between a mobile information terminal device via a plurality of mobile communication networks and an IP network and an information terminal device capable of making an IP call, the information terminal device being connected to a server via an IP network, The mobile information terminal device can communicate with the server via a mobile communication network and an IP network, and the mobile information terminal device includes a mobile communication network in which the mobile information terminal device is located, and at least three mobile communication networks include the mobile information. Present in the vicinity of the terminal device, the server has a base station information recording unit that records predetermined base station information,
The mobile information terminal device
Radio wave intensity measuring means for measuring radio wave intensity from each base station of the plurality of mobile communication networks for a predetermined time;
Base station information requesting means for requesting predetermined base station information regarding each base station to the server;
The predetermined base station recorded in the base station information recording unit transmitted by the server based on the radio field intensity measured from the base station by the radio field intensity measuring unit for a predetermined time and the request by the base station information request unit Based on the information, a movement trajectory calculating means for calculating a movement trajectory of the mobile information terminal device at the predetermined time by a predetermined method;
Base station selection means for selecting a base station that satisfies a predetermined base station selection condition based on the movement trajectory calculated by the movement trajectory calculation means;
A base station switching request means for requesting the server to switch to the base station selected by the base station selecting means,
The server
Base station information transmitting means for transmitting predetermined base station information recorded in a base station information recording unit to the mobile information terminal device side based on a request by the base station information requesting means;
A communication system comprising base station switching means for switching communication between the mobile information terminal apparatus and the information terminal apparatus to a base station requested to be switched by the base station switching request means.   2. The communication system according to claim 1, wherein the predetermined base station selection condition is obtained when the mobile information terminal apparatus is moved in an extension direction of the movement locus calculated by the movement locus calculation means. And a condition for selecting a base station with the highest radio field intensity.   2. The communication system according to claim 1, wherein the predetermined base station selection condition is determined based on the movement locus when the movement information terminal device is assumed to move in an extension direction of the movement locus calculated by the movement locus calculation means. A communication system characterized in that a condition for selecting a base station having the maximum radio wave intensity in the extension direction is selected according to the moving speed of the mobile information terminal device calculated based on the base station.   4. The communication system according to claim 1, wherein the predetermined base station information includes location information of each base station and correlation information between a distance from each base station and radio wave intensity, and The communication system is a method of calculating from the locus of the position of the mobile information terminal device obtained by three-point survey based on the distance from at least three base stations to the mobile information terminal device. A communication system between a mobile information terminal device via a plurality of mobile communication networks and an IP network and an information terminal device capable of making an IP call, the information terminal device being connected to a center side server via an IP network The mobile information terminal device can communicate with the center-side server via a mobile communication network and an IP network, and the center-side server is measured in advance by the mobile information terminal device for a predetermined time and transmitted to the center-side server. The trajectory of the radio field intensity from the base station of the mobile communication network, the base station and the base station selected by the mobile information terminal device after transmission and switched by the center side server, the switched base station and the It has an analysis recording unit that records the correlation between the mobile information terminal device and the information notified from the mobile information terminal device to the center-side server.
The mobile information terminal device
Radio wave intensity transmitting means for transmitting a radio wave intensity locus from each base station of the plurality of mobile communication networks measured for a predetermined time to the center side server at a predetermined timing;
When the radio field intensity from the base station in the service area becomes weak, the analysis requesting the analysis contents of the analysis recording unit correlated with the locus of the radio field intensity transmitted by the radio field intensity transmitting means to the center side server Content request means;
Based on the request by the analysis content requesting means, the center side server retrieves the analysis content correlated with the trajectory of the radio wave intensity transmitted by the radio wave intensity transmitting means from the analysis recording unit, and the searched analysis Content is transmitted to the mobile information terminal device side, based on the transmitted analysis content, base station selection means for selecting a base station to switch to,
Base station switching request means for requesting the center side server to switch to the base station selected by the base station selecting means,
The center server is
Based on the request of the analysis content requesting means, the analysis content correlated with the trajectory of the radio wave intensity transmitted by the radio wave intensity transmitting means is retrieved from the analysis recording unit, and the searched analysis content is retrieved from the mobile information terminal. Analysis content transmission means to be transmitted to the device side;
A communication system comprising base station switching means for switching communication between the mobile information terminal apparatus and the information terminal apparatus to a base station requested to be switched by the base station switching request means.   6. The communication system according to claim 5, wherein the communication state recorded in the analysis recording unit is recorded according to a moving speed of the mobile information terminal device calculated based on a trajectory of radio wave intensity. .   7. The communication system according to claim 5, wherein the mobile information terminal device notifies the center side server of a communication state between the base station switched by the base station switching means and the mobile information terminal device. A communication system further comprising means. A communication program for a mobile information terminal device to communicate with an information terminal device capable of making an IP call via a plurality of mobile communication networks and an IP network, the information terminal device being connected to a server via an IP network The mobile information terminal apparatus can communicate with the server via a mobile communication network and an IP network, and the mobile information terminal apparatus includes at least three mobile communication networks in which the mobile information terminal apparatus is located. It exists in the vicinity of the mobile information terminal device, the server has a base station information recording unit that records predetermined base station information, and the computer of the mobile information terminal device is
Radio wave intensity measuring means for measuring radio wave intensity from each base station of the plurality of mobile communication networks for a predetermined time;
Base station information requesting means for requesting predetermined base station information relating to each base station to the server,
The predetermined base station recorded in the base station information recording unit transmitted by the server based on the radio field intensity measured from the base station by the radio field intensity measuring unit for a predetermined time and the request by the base station information request unit A movement trajectory calculating means for calculating a movement trajectory of the mobile information terminal device at the predetermined time based on the information by a predetermined method;
Base station selection means for selecting a base station that satisfies a predetermined base station selection condition based on the movement locus calculated by the movement locus calculation means;
A communication program for functioning as a base station switching request means for requesting the server to switch to a base station selected by the base station selecting means, wherein the mobile station moves to the base station requested for switching by the server. A communication program for switching communication between an information terminal device and the information terminal device.   9. The communication program according to claim 8, wherein the predetermined base station selection condition is obtained when the mobile information terminal device moves in an extension direction of the movement trajectory calculated by the movement trajectory calculation means. A communication program characterized in that it is a condition for selecting a base station with the highest radio field intensity.   9. The communication program according to claim 8, wherein the predetermined base station selection condition is determined based on the movement locus when the movement information terminal device is assumed to move in an extension direction of the movement locus calculated by the movement locus calculation means. A communication program characterized in that it is a condition for selecting a base station having the maximum radio wave intensity in the extension direction according to the moving speed of the mobile information terminal device calculated based on the above.   11. The communication program according to claim 8, wherein the predetermined base station information includes position information of each base station and correlation information between a distance from each base station and a radio wave intensity, The communication program is a method of calculating from the locus of the position of the mobile information terminal device obtained by three-point surveying based on the distance from at least three base stations to the mobile information terminal device. A communication program for communication between a mobile information terminal device and an information terminal device capable of IP telephones via a plurality of mobile communication networks and an IP network, the information terminal device being connected to a server via an IP network The mobile information terminal device can communicate with the server via a mobile communication network and an IP network, and includes at least three mobile communication networks including the mobile communication network in which the mobile information terminal device is located. It exists in the vicinity of the mobile information terminal device, and the server has a base station information recording unit that records predetermined base station information.
Base station information transmitting means for transmitting predetermined base station information recorded in a base station information recording unit to the mobile information terminal device based on a request from the mobile information terminal device;
Based on the radio field intensity from each base station of the plurality of mobile communication networks measured by the mobile information terminal device for a predetermined time and the predetermined base station information transmitted by the base station information transmitting means, the predetermined time The movement trajectory of the mobile information terminal device is calculated by a predetermined method, a base station satisfying a predetermined base station selection condition is selected based on the movement trajectory, and the server is requested to switch to the selected base station. A communication program for causing a base station requested to switch to function as base station switching means for switching communication between the mobile information terminal device and the information terminal device. A communication program for a mobile information terminal device to communicate with an information terminal device capable of making an IP call via a plurality of mobile communication networks and an IP network, the information terminal device communicating with a center side server via an IP network The mobile information terminal device can communicate with the center side server via a mobile communication network and an IP network, and the center side server is measured in advance by the mobile information terminal device for a predetermined time and sent to the center side server. Radio field intensity trajectory from the transmitted base station of the mobile communication network, the base station and the base station selected by the mobile information terminal device after transmission and switched by the center side server, and the switched base station And an analysis recording unit that records the communication state between the mobile information terminal device and the information notified from the mobile information terminal device to the center-side server. The computer of the end device,
A radio field intensity transmitting means for transmitting a radio field intensity trajectory from each base station of the plurality of mobile communication networks measured at a predetermined time to the center side server at a predetermined timing;
When the radio field intensity from the base station in the service area becomes weak, the analysis requesting the analysis contents of the analysis recording unit correlated with the locus of the radio field intensity transmitted by the radio field intensity transmitting means to the center side server Content request means,
Based on the request by the analysis content requesting means, the center side server retrieves the analysis content correlated with the trajectory of the radio wave intensity transmitted by the radio wave intensity transmitting means from the analysis recording unit, and the searched analysis Content is transmitted to the mobile information terminal device side, and based on the transmitted analysis content, a base station selection means for selecting a base station to be switched to,
A communication program for causing a switch to a base station selected by the base station selection means to function as a base station switch request means for requesting the center side server to switch to a base station requested to switch by the server. A communication program, wherein communication between the mobile information terminal device and the information terminal device is switched.   14. The communication program according to claim 13, wherein the communication state recorded in the analysis recording unit is recorded in accordance with a moving speed of the mobile information terminal device calculated based on a trajectory of radio wave intensity. .   15. The communication program according to claim 13, wherein the mobile information terminal device notifies the center side server of a communication state between the base station switched by the base station switching means and the mobile information terminal device. A communication program further comprising means. A communication program for communication between a mobile information terminal device and an information terminal device capable of IP telephones via a plurality of mobile communication networks and an IP network, the information terminal device being a center-side server via an IP network And the mobile information terminal device can communicate with the center side server via a mobile communication network and an IP network, and the center side server is measured in advance by the mobile information terminal device for a predetermined time. The trajectory of the radio field intensity from the base station of the mobile communication network transmitted to the mobile station and the communication between the base station selected by the mobile information terminal device and switched by the center side server after transmission and the mobile information terminal device An analysis recording unit that records a correlation between the mobile information terminal device and the notification sent from the mobile information terminal device to the center side server.
The mobile information terminal device transmits, to the center-side server at a predetermined timing, a trajectory of radio wave intensity from each base station of the plurality of mobile communication networks measured for a predetermined time, and from the base station in the service area. When the radio field strength becomes weaker, the center side server is requested to transmit a communication state correlated with the transmitted radio field intensity trajectory. Based on the request, the center side server is correlated with the transmitted radio field intensity trajectory. Communication state transmitting means for searching the communication recording state from the analysis recording unit and transmitting the searched communication state to the mobile information terminal device side,
The mobile information terminal device selects a base station to be switched based on the communication state transmitted to the mobile information terminal device by the communication state transmitting means, and the switching to the selected base station is sent to the center side server. A communication program for causing a requested base station to switch to function as base station switching means for switching communication between the mobile information terminal device and the information terminal device.   The computer-readable recording medium which recorded the communication program in any one of Claims 8 thru | or 16. A communication method from a mobile information terminal device to an information terminal device capable of making an IP phone call via a plurality of mobile communication networks and an IP network, wherein the information terminal device is connected to a server via an IP network The information terminal device can communicate with the server via a mobile communication network and an IP network, and the mobile information terminal device includes a mobile communication network in which the mobile information terminal device is located, and at least three mobile communication networks include the mobile information terminal. In the vicinity of the device,
The mobile information terminal device
A radio wave intensity measuring step for measuring a radio wave intensity from each base station of the plurality of mobile communication networks for a predetermined time;
A base station information requesting step for requesting predetermined base station information regarding each base station to the server;
Based on the request of the base station information request step, the server transmits a predetermined base station information recorded in a base station information recording unit to the mobile information terminal device side, and
The mobile information terminal device
Based on the radio field intensity from each base station measured in the radio field intensity measurement step for a predetermined time and the predetermined base station information transmitted in the base station information transmission step, the movement trajectory of the mobile information terminal device at the predetermined time A movement trajectory calculating step for calculating
A base station selection step of selecting a base station that satisfies a predetermined base station selection condition based on the movement trajectory calculated in the movement trajectory calculation step;
A base station switching request step for requesting the server to switch to the base station selected in the base station selection step;
The server comprises a base station switching step of switching communication between the mobile information terminal device and the information terminal device to the base station requested to be switched in the base station switching request step. Method.   19. The communication method according to claim 18, wherein the predetermined base station selection condition is obtained when the mobile information terminal device is assumed to move in an extension direction of the movement locus calculated in the movement locus calculation step. A communication method characterized in that a condition for selecting a base station with the highest radio field intensity is selected.   19. The communication method according to claim 18, wherein the predetermined base station selection condition includes the movement trajectory when the movement information terminal device is assumed to move in an extension direction of the movement locus calculated in the movement locus calculation step. A communication method characterized in that it is a condition for selecting a base station having the maximum radio wave intensity in the extension direction according to the moving speed of the mobile information terminal device calculated based on the above.   21. The communication method according to claim 18, wherein the predetermined base station information includes position information of each base station and correlation information between a distance from each base station and a radio wave intensity, The communication method is a method of calculating from the locus of the position of the mobile information terminal device obtained by three-point surveying based on the distance from at least three base stations to the mobile information terminal device. A communication method from a mobile information terminal device to an information terminal device capable of making an IP phone call via a plurality of mobile communication networks and an IP network, the information terminal device being connected to a center side server via an IP network, The mobile information terminal device can communicate with the center-side server via a mobile communication network and an IP network, and the center-side server is measured in advance by the mobile information terminal device for a predetermined time and transmitted to the center-side server. The trajectory of the radio field intensity from the base station of the mobile communication network, the base station and the base station selected by the mobile information terminal device after transmission and switched by the center side server, the switched base station and the mobile It has an analysis recording unit that records a correlation between the state of communication with the information terminal device and the information notified from the mobile information terminal device to the center side server,
The mobile information terminal device
A radio wave intensity transmission step of transmitting a radio wave intensity locus from each base station of the plurality of mobile communication networks measured for a predetermined time to the center side server at a predetermined timing;
When the radio field intensity from the base station in the service area becomes weak, the analysis requesting the analysis content of the analysis recording unit correlated with the locus of the radio field intensity transmitted in the radio field intensity transmission step to the center side server A content request step;
Based on the request of the analysis content requesting step, the center side server searches the analysis recording unit for the analysis content correlated with the trajectory of the radio wave intensity transmitted in the radio wave intensity transmitting step, and the searched analysis Analysis content transmission step of transmitting content to the mobile information terminal device side;
The mobile information terminal device
Based on the analysis content transmitted in the analysis content transmission step, a base station selection step of selecting a switching destination base station,
A base station switching request step for requesting the center side server to switch to the base station selected in the base station selecting step;
The center-side server comprises a base station switching step of switching communication between the mobile information terminal device and the information terminal device to the base station requested to be switched in the base station switching request step. Communication method.   23. The communication method according to claim 22, wherein the communication state recorded in the analysis recording unit is recorded in accordance with a moving speed of the mobile information terminal device calculated based on a trajectory of radio wave intensity. . 24. The communication method according to claim 22, further comprising a notification step of notifying the center side server of a communication state between the switched base station and the mobile information terminal device following the base station switching step. A communication method characterized by the above.

Images