JP4902402B2 - Portable terminal device and handover method - Google Patents

Description

  The present invention relates to a mobile terminal device and a handover method.

  In recent years, mobile phones (mobile terminal devices) equipped with a wireless LAN function have been developed. This is because a network (hereinafter referred to as NW) connection within an access point (hereinafter also referred to as AP) area can be performed via a wireless LAN, which is useful for improving communication speed and saving communication costs.

  A mobile phone equipped with such a wireless LAN function needs to have a function that can use both the wireless LAN and the mobile phone NW. Therefore, for example, a dual mode in which the wireless LAN is preferentially used during wireless LAN connection (accepting incoming calls, etc.) and the mobile phone NW is used when the wireless LAN is not connected (when connection is not possible), Alternatively, a single mode is prepared in which only the wireless LAN is used and the mobile phone NW cannot be used.

  Among the above modes, in the dual mode, when the mobile phone goes out of the wireless LAN area, the mobile phone automatically performs a handover to connect to the NW of the mobile phone without manual operation. The NW of the telephone can be used.

As a handover method, there has been proposed a technique for measuring electric field strength per unit time for a cellular phone communication network and a wireless LAN communication network, and performing handover when a set threshold value is exceeded. (For example, refer to Patent Document 1).
Japanese Patent Application Laid-Open No. 07-203517

  However, in the conventional technology, when the mobile phone goes out of the wireless LAN area, the mobile phone is easily connected to the NW of the mobile phone, increasing the user billing (increasing the mobile phone fee), There are cases where a large load is applied to the CPU of the telephone.

  For example, when a user (mobile phone) is using a wireless LAN while moving and the mobile phone temporarily leaves or returns to the wireless LAN area, or in another wireless LAN area that is a little away When moving, an increase in charging due to connection to the cellular phone NW more than necessary, an increase in CPU load on the cellular phone, and the like occur.

  That is, in the conventional mobile phone, when the wireless LAN is out of the range of the wireless LAN while being connected, the mobile phone NW is immediately handed over. For this reason, there has been a problem that an increase in billing, an increase in the CPU load of the mobile phone, and the like occur.

  The present invention has been made in view of the above circumstances, and provides a mobile terminal device and a handover method capable of reducing a load at the time of handover (an increase in charging, an increase in CPU load on a mobile phone, etc.). The purpose is to do.

  In order to solve the above-described problem, a mobile terminal device according to the present invention includes a first communication unit that can communicate with an access point of a communication network that conforms to the first communication standard, and a communication that conforms to the second communication standard. A second communication means capable of communicating with an access point of the network; and a position detection means for detecting a current position of the terminal when communication by the first communication means is interrupted. , Area information storage means for storing communicable area information for each access point of the communication network compliant with the first communication standard acquired in advance, the current position of the terminal detected by the position detection means, and the area A positional relationship calculating means for calculating a positional relationship with a communicable area for each access point of the communication network conforming to the first communication standard stored in the information storage means; and the calculated positional relationship Whether to reconnect to a communication network that conforms to the first communication standard or to connect to a communication network that conforms to the second communication standard based on the first communication standard Determining means for prioritizing connection with the communication network to be determined.

  Further, in the mobile terminal device, the determination means is when the current position of the terminal is within a communicable area of an access point of a communication network conforming to the first communication standard in which communication was last lost or If it is within the communicable area of any access point of each access point of the communication network that conforms to the first communication standard stored in the area information storage means, it conforms to the first communication standard. Attempts to reconnect to the communication network, and the current location of the terminal is out of any communicable area within each access point of the communication network conforming to the first communication standard stored in the area information storage means And if the distance to any one of the access points is within a predetermined set value, a re-connection with a communication network conforming to the first communication standard is attempted after a predetermined time has elapsed, It is preferred that the standing position when a location other than the determining to perform a connection to a communication network that conforms to the second communication standard.

  In the mobile terminal device, the position detecting means is preferably a GPS.

  In order to solve the above-described problem, the portable terminal device handover method according to the present invention includes (1) a step of detecting a disconnection with a current wireless LAN access point, and (2) the wireless communication device. When it is detected that the connection with the LAN access point is interrupted, a step of trying to reconnect with the wireless LAN access point a predetermined number of times; (3) If the reconnection fails, the location information of the terminal is (4) a step of determining whether or not the terminal itself is within a communicable area of the wireless LAN access point that has confirmed the connection from the position information; and (5) If it is determined that the terminal is within the area of the wireless LAN access point that has confirmed the connection last, the terminal attempts to reconnect to the wireless LAN access point. (6) If the reconnection fails, within the communication area of any one of the wireless LAN access points of the wireless LAN access points acquired and stored in advance by the terminal from the location information (7) In the above step, it is determined that the terminal is within the communicable area of any of the wireless LAN access points acquired and stored in advance by the terminal. And (8) if the connection fails, from the location information, the terminal obtains and stores the wireless LAN access point in advance from the location information. The wireless LAN access point is not within the communicable area of any wireless LAN access point, and the distance to any of the wireless LAN access points is less than a predetermined set value. A step of determining whether or not there is a wireless LAN access point in the vicinity, and (9) any one of the wireless LAN access points acquired and stored in advance by the own terminal in the step When it is determined that there is a wireless LAN access point that is not within the communicable area of the access point and the distance to any one of the wireless LAN access points is within a predetermined setting value, the wireless LAN A step of trying to connect to the access point; (10) a step of executing the steps (3) to (9) a predetermined number of times if the connection fails; and (11) a wireless LAN access point in the step A step of connecting to the mobile phone NW when all the connections to the mobile phone have failed.

  According to the present invention, frequent connection to the mobile phone NW can be prevented, and an increase in billing and a load on the CPU of the mobile phone can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the following, a mobile phone will be described as a mobile terminal device, but the present invention is not limited to this, and may be a PHS (Personal Handy Phone System), a PDA (Personal Digital Assistant), a portable navigation device, a laptop computer, or the like. There may be.

  The basic structure of the mobile phone 1 will be described with reference to FIGS. FIG. 1 shows a front view of the mobile phone 1 in the opened state (first open state). 2A shows a left side view when the mobile phone 1 is opened, and FIG. 2B shows a right side view when the mobile phone 1 is opened. FIG. 3 shows a rear view in a state where the mobile phone 1 is opened.

  The mobile phone 1 includes an operation unit side body 2 and a display unit side body 3. The operation unit side body 2 and the display unit side body 3 are connected to each other via a connection unit 4 having a biaxial hinge mechanism, and the mobile phone 1 can be deformed into an open state and a closed state. In each closed state, the display unit side body 3 can be switched between a front state and a back state.

  Here, the closed state is a state in which both housings are arranged so as to overlap each other, and the open state is a state in which both housings are arranged so as not to overlap each other. In the open state, the display 30 disposed on the surface 3A of the display unit side body 3 to be described later and the operation key group 11 disposed on the front case 2a of the operation unit side body 2 are the same. The back state is a state in which the display 30 in the display unit side body 3 and the operation key group 11 in the operation unit side body 2 are disposed to face opposite sides. Say. Further, the front state in the closed state is a state in which the display 30 in the display unit side body 3 is arranged so as to face the operation key group 11 in the operation unit side body 2, and the back state in the closed state is In this state, the display 30 in the display unit side body 3 is exposed without facing the operation key group 11 in the operation unit side body 2.

  The outer surface of the operation unit side body 2 includes a front case 2a and a rear case 2b. The operation unit side body 2 exposes the operation key group 11 and the voice input unit (microphone) 12 to which the voice uttered by the user of the mobile phone 1 is input on the front case 2a side. Configured. Here, the operation key group 11 includes a function setting operation key 13 for operating various functions such as various settings, a telephone book function, and a mail function, and an input for inputting numbers of telephone numbers, characters such as mails, and the like. An operation key 14 and a determination operation key 15 for performing determination in various operations, scrolling in the up / down / left / right directions, and the like are configured. The microphone 12 is disposed on the outer end side opposite to the connecting portion 4 side in the longitudinal direction of the operation unit side body 2. That is, the microphone 12 is disposed on one outer end side when the mobile phone 1 is in the open state.

  Each key constituting the operation key group 11 is predetermined according to a deformed state such as an open / close state or a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of application being activated. Function is assigned (key assignment). In the mobile phone 1, when each key constituting the operation key group 11 is pressed by the user, an operation corresponding to the function assigned to each key is executed.

  As shown in FIG. 2A, on one side surface of the operation unit side body 2, an interface 16 for transmitting / receiving data to / from an external device (for example, a host device), a headphone / microphone terminal 17, A removable external memory interface 18 and a charging terminal 19 for charging the battery are provided. The interface 16, the headphone terminal / microphone terminal 17, and the interface 18 are covered with a dust-proof cap that can be attached and detached when not in use.

  On the other side of the operation unit side body 2, as shown in FIG. 2B, a pair of side keys 20, an operation key 21 used at the time of imaging, and a broadcast wave whose radio wave reception angle can be adjusted. A receiving antenna 22 is arranged. A predetermined function is assigned to the side key 20 in accordance with a deformed state such as an open / close state and a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of the activated application ( Key assignment). Here, similarly to the above, when the side key 20 is pressed by the user, an operation corresponding to the function assigned to the side key 20 in the mobile phone 1 is executed.

  As shown in FIG. 3, a camera unit 23 that captures an image of a subject and a light unit 24 that irradiates the subject with light are disposed in the rear case 2 b of the operation unit side body 2. The camera unit 23 and the light unit 24 are arranged on the connection unit 4 side in the operation unit side body 2. In addition, the rear case 2b in the operation unit side body 2 has an opening for mounting the battery in a battery housing portion, which will be described in detail later, and a battery lid 25 is disposed so as to close the opening. Is done.

  Moreover, the upper end part of the operation part side housing | casing 2 and the lower end part of the display part side housing | casing 3 are connected via the connection part 4 provided with a biaxial hinge mechanism, as shown in FIGS. As shown in FIG. 3, the sub operation key group 33 is arranged in a line in the width direction (short direction) of the mobile phone 1 on one surface (back surface) of the connecting portion 4. Each of the keys constituting the sub operation key group 33 depends on a deformed state such as an open / closed state or a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of application being activated. A predetermined function is assigned (key assignment). In the mobile phone 1, when each key constituting the operation key group 11 is pressed by the user, an operation corresponding to the function assigned to each key is executed.

  Further, the display unit side body 3 is configured by a front case 3a and a rear case 3b on the outer surface. As shown in FIG. 1, a display 30 having a predetermined shape for displaying various information and a sound output unit 31 for outputting sound on the other party side of the call are exposed on the front case 3 a in the display unit side body 3. To be arranged. Here, the audio output unit 31 is disposed on the outer end side opposite to the connection unit 4 in the longitudinal direction of the display unit side body 3. That is, the audio output unit 31 is arranged on the other end side when the mobile phone 1 is in the open state.

  Further, as shown in FIG. 3, a sub-display 32 for displaying various types of information is disposed in the rear case 3 b of the display unit side body 3 so as to be exposed. Each of the display 30 and the sub-display 32 includes a liquid crystal panel, a drive circuit that drives the liquid crystal panel, and a light source unit such as a backlight that emits light from the back side of the liquid crystal panel.

  In the present embodiment, the cellular phone 1 that can be folded by the connecting portion 4 is described. However, the cellular phone 1 is not foldable, and the operation unit side body 2 and the display unit side body 3 are overlapped. One of the casings is slid in one direction, or one of the casings is rotated about an axis along the direction in which the operation unit side casing 2 and the display unit side casing 3 overlap. A rotating type (turn type), or a type (straight type) in which the operation unit side body 2 and the display unit side body 3 are arranged in one housing and does not have a connecting portion may be used.

  Next, each function of the mobile phone 1 will be described with reference to the functional block diagram of FIG. As shown in FIG. 4, the mobile phone 1 includes a first communication unit (first communication) capable of communicating with a wireless LAN access point (hereinafter also referred to as AP) which is a communication network compliant with the first communication standard. Means) 100, a second communication unit (second communication means) 200 capable of communicating with an access point of the mobile phone NW, which is a communication network compliant with the second communication standard, and a processing unit 201 for performing predetermined processing. And a GPS receiver 150 as position detecting means. Further, the battery 90 supplies power to the first communication unit 100, the second communication unit 200, the processing unit 201, and the GPS receiver 150. Further, the CPU 202 and the communication network connection processing control microcomputer 300 cooperate with each other to perform predetermined control on the first communication unit 100, the second communication unit 200, the processing unit 201, and the GPS receiver 150. Do.

  The first communication unit 100 communicates by telephone or mail with another communication terminal device via a base station based on a predetermined communication method (compliant with a wireless LAN, for example, IEEE 802.11). And a communication processing unit 101 including a transmission circuit and a reception circuit (not shown).

  In addition, the second communication unit 200 performs telephone communication or mail with another communication terminal device via a base station based on a predetermined communication method (for example, CDMA (Code Division Multiple Access) 2000_1x or the like). An antenna unit 80 (main antenna) that performs communication and the like, and a communication processing unit 203 that includes a transmission circuit and a reception circuit (not shown).

  The processing unit 201 includes an operation key group 11, a microphone 12, a display 30, a sound output unit 31, a memory 204 in which predetermined data is stored, and a sound processing unit 205 that performs predetermined sound processing. An image processing unit 206 that performs predetermined image processing, a camera unit 23 that captures an image of a subject, a speaker 207 that outputs a ringtone, and the like.

  The GPS receiver 150 includes an antenna unit 151 that receives radio waves from GPS satellites, and a position information detection unit 152 that detects the position of the mobile phone 1 based on data received from the GPS satellites.

  Next, the configuration of the communication network connection processing control microcomputer 300 that controls the reconnection processing after the wireless LAN connection is disconnected will be described. As shown in FIG. 5, a communication network connection processing control microcomputer 300 includes at least a control unit 301, a calculation unit 302, a memory unit (area information storage unit 303, ROM 304 and work RAM 305), and input / output unit (FIG. 5). The calculation unit 302 functions as various functional means described above or described later. The calculation unit 302 includes a communication disconnection detection unit 306, a switching unit 307, a positional relationship calculation unit 308, and a determination unit 309 as functional units.

  The control unit 301 controls the entire communication network connection processing control microcomputer 300 according to a program stored in the ROM 304. The area information storage unit 303 is a communication area for each access point of a wireless LAN, which is a communication network compliant with the first communication standard, acquired in advance (in this embodiment, the communication area of the AP constituting the communication network is It is assumed that a plurality of points are scattered without overlapping each other (see FIG. 6). The ROM 304 stores a program for performing reconnection processing after disconnection of the wireless LAN. The work RAM 305 is a storage area temporarily used by the control unit 301 and the calculation unit 302 when executing the program.

  For example, the communication disconnection detecting unit 306 is unable to communicate with the AP (communication with the AP) based on a notification signal from the communication processing unit 101. Detect that. The switching unit 306 switches between communication with the AP by the first communication unit 100 and communication with the AP by the second communication unit 200 alternately.

  The positional relationship calculating means 308 determines that the positional relationship between the mobile phone 1 and a wireless LAN access point which is a communication network compliant with the first communication standard, that is, the current location of the mobile phone 1 (own terminal) is (1) It is within the communicable area of the access point of the communication network (wireless LAN) that complies with the first communication standard that is finally disconnected, or (2) the first communication standard stored in the area information storage means 303 Or within the communicable area of any one of the access points of the communication network conforming to (3) each of the communication networks conforming to the first communication standard stored in the area information storage means 303 It is outside any communicable area of the access points and the distance to any access point is within a predetermined set value (nearby: described later), or (4) a position other than the above From the position information obtained from the GPS receiver 150 and the position information of the communicable area for each access point of the wireless LAN which is a communication network compliant with the first communication standard stored in the area information storage unit 303 calculate.

  If the current position of the mobile phone calculated by the positional relationship calculation means 308 is located in the above (1) or (2), the determination means 309 is a communication that conforms to the first communication standard. When reconnecting with an AP of a network (wireless LAN) and located in the above (3), an AP of a communication network (wireless LAN) conforming to the first communication standard after a predetermined time has elapsed If it is located in the above (4), it is determined to connect to the AP of the communication network (mobile phone NW) compliant with the second communication standard, and the first communication Control unit 100 or second communication unit 200 (described later).

  Next, the operation of the control microcomputer 300 for communication network connection processing of the cellular phone 1 (and the cooperating CPU 202: the same applies hereinafter), that is, the reconnection processing operation after disconnection of the wireless LAN connection is shown in the flowcharts shown in FIGS. Will be described with reference to FIG. Here, it is assumed that when the mobile phone 1 starts a wireless LAN connection, a reconnection processing operation (the flowcharts shown in FIGS. 7 and 8) after the wireless LAN connection is disconnected is executed.

  First, when the wireless LAN connection is started by the mobile phone 1 accessing WEB or the like, the communication network connection processing control microcomputer 300 sets the parameters i and j to 0 and sets the parameter k to 5 for example. Set (step S1). Subsequently, in step S2, the communication disconnection detecting means 306 waits until the wireless LAN connection disconnection is detected (step S2 is repeated), and when the wireless LAN disconnection is detected, the process proceeds to step S3. . The value of k (number of reconnection processes) is not limited to 5.

  When the process proceeds to step S3, the communication network connection processing control microcomputer 300 increments the parameter i, and in step S4, attempts to reconnect to the AP that has been connected (connected) until now, and the process proceeds to step S5. Transfer.

  When the process proceeds to step S5, the communication network connection processing control microcomputer 300 determines whether or not the wireless LAN connection is successful by the reconnection operation to the AP performed in step S4. If it is determined that the wireless LAN connection has been successful, the process is terminated. If it is determined that the wireless LAN connection has failed, the process proceeds to step S6.

  In step S6, it is determined whether or not the value of the parameter i is larger than k (in this case, 5). When the value of the parameter i is smaller than the value of k, the processing of step S3 to step S6 is repeated (in this case, 5 times), and when the value of the parameter i becomes larger than the value of k, the processing moves to step S7.

  In step S7, the GPS receiver 150 acquires the location information of the mobile phone 1. In step S8, the location information acquired in step S7 and the wireless LAN access point stored in the area information storage unit 303 are acquired. Based on the information (wireless LAN access point area list), it is determined whether or not the mobile phone 1 is currently in the communicable area of the wireless LAN AP to which the wireless LAN was connected last. If it is determined that the user is within the communicable area, reconnection to the AP is attempted (step S9), and the process proceeds to step S10. If it is determined that the user is outside the communicable area, the process proceeds to step S11.

  In step S10, it is determined whether or not the wireless LAN connection is successful by the reconnection operation to the AP performed in step S9. If it is determined that the wireless LAN connection is successful, the process is terminated. If it is determined that the wireless LAN connection is unsuccessful, the process proceeds to step S11.

  When the process proceeds to step S11, the mobile phone 1 is currently using the wireless LAN access point area based on the position information acquired in step S7 and the wireless LAN access point area list stored in the area information storage unit 303. It is determined whether or not any AP in the list is within the communicable area. If it is determined that any AP is within the communicable area, an attempt is made to connect to the AP (step S12), and the process proceeds to step S13. If it is determined that all the APs are not within the communicable area, the process proceeds to step S14.

  In step S13, it is determined whether or not the wireless LAN connection is successful by the reconnection operation to the AP performed in step S12. If it is determined that the wireless LAN connection is successful, the process is terminated. If it is determined that the wireless LAN connection is unsuccessful, the process proceeds to step S14.

  When the process proceeds to step S14, the mobile phone 1 currently uses the wireless LAN access point area based on the position information acquired in step S7 and the wireless LAN access point area list stored in the area information storage unit 303. It is determined whether there is any wireless LAN access point in the vicinity (described later) although it is not within the communicable area of all APs in the list. If it is determined that any AP is present in the vicinity, the process proceeds to step S15. If it is determined that any AP is not present in the vicinity, the mobile phone NW is connected (step S20). ).

  Here, with reference to FIG. 6, the distance used in step S <b> 14 to indicate “the AP exists in the vicinity of the mobile phone 1” will be described with reference to FIG. 6.

That is, as shown in FIG. 6, r is the distance to the extension of the AP communicable area, R is the distance from the position of the mobile phone 1 to the extension of the nearest AP communicable area, and A is a predetermined value. Assuming that the set value (for example, 500 m) is used, in this embodiment, the case where the mobile phone 1 is present at a position that satisfies the following equation (1) is referred to as “the AP is present in the vicinity of the mobile phone 1”.
r <(R + r) ≦ A (1)

  The communication network connection processing control microcomputer 300 that has shifted the processing from step S14 to step S15 stops the processing for a certain time (for example, 30 seconds), then increments the parameter j, and in step S17, the cellular phone 1 Attempts to connect to an AP existing in the vicinity of and moves the process to step S18.

  In step S18, the communication network connection processing control microcomputer 300 determines whether or not the wireless LAN connection is successful by the connection operation to the nearby AP performed in step S17. If it is determined that the wireless LAN connection is successful, the process is terminated. If it is determined that the wireless LAN connection is unsuccessful, the process proceeds to step S19.

  In step S19, it is determined whether or not the value of the parameter j is larger than k (in this case, 5). If the value of the parameter j is smaller than the value of k, the processing from step S7 to step S19 is repeated (in this case, 5 times), and when the value of the parameter j becomes larger than the value of k, the processing moves to step S20. Connect to the mobile phone NW.

  In this way, the mobile phone (mobile terminal device) 1 according to the present invention does not immediately hand over to the mobile phone NW when the wireless LAN and the mobile phone 1 cannot be connected. Based on the location information of 1, that is, the current location of the mobile phone 1 is (1) the communicable area of the access point of the communication network (wireless LAN) that complies with the first communication standard in which communication was last terminated Or (2) within the communicable area of any access point of each access point of the communication network conforming to the first communication standard stored in the area information storage unit 303 (3 ) Out of any communicable area of each access point of the communication network conforming to the first communication standard stored in the area information storage means 303 and with any access point Since the reconnection processing to the wireless LAN is performed by a predetermined method based on whether the separation is within a predetermined set value (near) or (4) a position other than the above, frequent mobile phone Connection to the telephone NW can be prevented, and an increase in billing and a load on the CPU of the mobile phone 1 can be reduced.

  In the embodiment, the stand-alone GPS receiver is used to acquire the position information of the mobile phone. However, the present invention is not limited to this. For example, charging is generated, but the mobile phone NW You may make it acquire by connecting to. In addition, the number of attempts to reconnect to the AP, the wait time, the distance from the mobile phone corresponding to “near” to the AP, and the like can be arbitrarily set in advance by the user.

  Furthermore, in the embodiment, when the wireless LAN connection fails in step S10 of the reconnection processing flowchart (FIGS. 7 and 8) after the wireless LAN connection is disconnected, the process proceeds to step S11 and reconnection is attempted. The connection may be given up and the process may proceed to step S20 to connect to the mobile phone NW. Similarly, when the wireless LAN connection fails in step S12, the process proceeds to step S14 to attempt reconnection. However, the reconnection may be given up and the process may proceed to step S20 to connect to the mobile phone NW.

The front view in the state (1st open state) which opened the mobile telephone is shown. (A) The left view in the state which opened the mobile phone is shown, (B) The right view in the state which opened the mobile phone is shown. The rear view in the state which opened the mobile telephone is shown. It is a block diagram which shows the function of the mobile telephone which concerns on this invention. FIG. 5 is a block diagram of a communication network connection processing control microcomputer provided in the mobile phone shown in FIG. 4. It is a figure for demonstrating the positional relationship of AP of a wireless LAN, and a mobile telephone. It is the flowchart which showed the procedure of the reconnection process after wireless LAN connection disconnection. It is the flowchart which showed the procedure of the reconnection process after wireless LAN connection disconnection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile telephone 2 Operation part side housing | casing 2a, 3a Front case 2b, 3b Rear case 3 Display part side housing | casing 4 Connection part 11 Operation key group 12 Microphone 23 Camera part 30 Display 31 Audio | voice output part 80, 81, 151 Antenna 100 First communication unit 101, 203 Communication processing unit 150 GPS receiver 152 Position information detection unit 200 Second communication unit 201 Processing unit 202 CPU
204 Memory 205 Sound processing unit 206 Image processing unit 207 Speaker 300 Communication network connection processing control microcomputer 301 Control unit 302 Calculation unit 303 Area information storage means 304 Program ROM
306 Communication disconnection detection means 307 Switching means 308 Positional relationship calculation means 309 Determination means

Claims (2)

A first means for detecting that a connection with an access point of a communication network conforming to the current first communication standard is interrupted;
A second means for attempting to reconnect to the access point a predetermined number of times if it is detected that the connection with the access point has been interrupted;
If the reconnection fails in the process of the second means, a third means for acquiring the location information of the terminal;
A fourth means for determining whether or not the terminal itself is within the communicable area of the access point that has confirmed the connection based on the position information acquired by the third means;
If it is determined by the fourth means that the terminal is within the area of the access point that last confirmed the connection, a fifth means for attempting to reconnect to the access point;
If the reconnection fails in the process of the fifth means, whether or not the terminal is within the communicable area of any of the access points acquired and stored in advance from the location information A sixth means for determining whether or not
If it is determined by the sixth means that the terminal is within the communicable area of any of the access points acquired and stored in advance by the sixth means, a seventh means for attempting to connect to the access point;
If the connection fails in the process of the seventh means, it is not within the communicable area of all the access points among the access points acquired and stored in advance by the own terminal from the position information, and any of the above An eighth means for determining whether an access point having a distance from the access point within a predetermined set value exists in the vicinity;
Access that is not within the communicable area of all access points of the access points acquired and stored in advance by the own terminal by the eighth means, and the distance to any one of the access points is within a predetermined set value If it is determined that the point exists in the vicinity, a ninth means for attempting to connect to the access point after a predetermined time has elapsed;
A tenth means for executing the processes of the third to ninth means a predetermined number of times when the connection fails in the process of the ninth means;
An eleventh means for connecting to a communication network compliant with the second communication standard when all of the third to ninth means fail to connect to the access point even when the processing has been executed the predetermined number of times,
The first means is a communication disconnection detection means, the second means is a communication network connection processing microcomputer, the third means is a position detection means, the sixth means is a positional relationship calculation means, 4, 5, 7 to 11 means are judgment means.
The portable terminal device characterized by the above-mentioned. (1) a first step of detecting that a connection with an access point of a communication network conforming to the current first communication standard is interrupted;
(2) if it is detected that the connection with the access point is interrupted, a second step of attempting to reconnect with the access point a predetermined number of times;
(3) If the reconnection fails, a third step of acquiring location information of the own terminal;
(4) a fourth step of determining from the position information whether or not the terminal itself is within the communicable area of the access point that confirmed the connection;
(5) In the fourth step, when it is determined that the terminal is in the area of the access point that has confirmed the connection last, the fifth step tries to reconnect to the access point ;
(6) in said fifth step, when said reconnection fails, from the position information, the own terminal is previously obtained communicable area of one access point of respective access points that is stored A sixth step of determining whether or not,
(7) said at sixth step, when the own terminal is determined to have a pre-acquired communicable area of one access point of respective access points stored, it attempts to connect with the access point The seventh step;
(8) Failure to said connection, from the position information, and without and said one of the access points can communicate within the area of all of the access points among the access points to which the own terminal is previously obtained and stored An eighth step of determining whether or not an access point having a distance within a predetermined set value exists in the vicinity;
(9) in the eighth step, setting the distance between no and said one of the access points can communicate within the area of all of the access points among the access points to which the own terminal has been previously acquired and stored is predetermined If it is determined that there is an access point in the vicinity, the ninth step of trying to connect to the access point after a predetermined time;
(10) In the ninth step, if the connection fails, the tenth step of executing the third step (3) to the ninth step (9) a predetermined number of times;
(11) In the tenth step, if all the connections with the access point have failed, an eleventh step for connecting to a communication network compliant with the second communication standard ;
A handover method for a mobile terminal device, comprising:

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