JP5020022B2 - Portable terminal, program and method for automatically starting narrow area high speed wireless communication interface using GPS - Google Patents

Description

  The present invention relates to a portable terminal, a program, and a method for automatically starting a narrow-area high-speed wireless communication interface.

  In recent years, portable terminals compatible with multi-mode mobile radio have been developed that can communicate with a plurality of communication systems and can switch between the communication systems according to the current position. Such a portable terminal needs to detect the service area of the second communication system to be switched to when communicating with the first communication system.

  A mobile terminal compatible with multi-mode mobile radio can usually communicate with both a wide area mobile communication system and a narrow area high speed radio communication system. As a wide area mobile communication system, there is typically a CDMA (Code Division Multiple Access) type cellular communication system. As a narrow area high speed wireless communication system, there is typically a wireless LAN (Local Area Network) communication system of the IEEE 802.11 standard. Therefore, such a portable terminal has a cellular communication interface and a wireless LAN communication interface.

  At present, the wireless LAN communication area is narrower than the cellular communication area, most of which is limited to indoors. For this reason, the mobile terminal needs to periodically discover (sensing) the access point by activating the wireless LAN communication interface when communicating with the base station using the cellular communication interface (for example, non-patented). Reference 1).

  At this time, there is a technique in which a user who has a portable terminal manually selects a communication mode (see, for example, Non-Patent Document 2). According to this technology, the “mobile phone only” mode and the “mobile phone and wireless LAN” mode can be selected as the communication mode. For example, when going out, the mode is switched to the “mobile phone only” mode, and when the mobile phone is moved to a place where the wireless LAN can be used, such as in the office or indoors, the mode is switched to the “mobile phone and wireless LAN” mode. This eliminates the need for sensing the access point of the wireless LAN in the “mobile phone only” mode, and can reduce the power consumption of the battery of the mobile terminal when going out.

  In addition, there is a technology that adopts an architecture for exchanging area information between a cellular communication system and a wireless LAN communication system to improve the problem of always starting a wireless LAN communication interface (see Non-Patent Document 3, for example).

  Furthermore, there is a technique in which a server accumulates area information for wireless LAN communication (see Non-Patent Document 4, for example). According to this technique, the mobile terminal transmits the current position information to the server. On the other hand, the server determines whether or not the current position of the mobile terminal is covered by the wireless LAN communication area, and returns the determination result to the mobile terminal. The portable terminal activates the wireless LAN communication interface when the current position is covered by the wireless LAN communication area. This eliminates the need to always activate the wireless LAN communication interface.

  Furthermore, if a certain number of searches fail without periodically searching for access points for wireless LAN communication, the time until the next search is made longer than before, so that the battery of the mobile terminal when going out can be There is also a technique for reducing power consumption (see, for example, Patent Document 1).

“KDDI, mobile phone, PHS, wireless LAN automatic switching tool provided free of charge”, bb Watch Impress, [online], [searched on September 19, 2007], Internet <URL: http://bb.watch. impress.co.jp/cda/news/2670.html> "DOCOMO develops FOMA" N900iL "for corporations with wireless LAN", Keitai Impress, [online], [Search September 19, 2007], Internet <URL: http://k-tai.impress.co .jp / cda / article / news_toppage / 19695.html> SuKyoung Lee and Nada Golmie, “Power-EfficientInterface Selection Scheme using Paging of WWAN for WLAN in Heterogeneous Wireless Networks,” IEEE International Conference on Communications (ICC) 2006, Jun. 2006. M. Ylianttila, J. Makela and K. Pahlavan, “Analysis of handoff in a location-aware vertical multi-access network,” ComputerNetworks 47 (2), Feb. 2005. E. Shih, P. Bahl, and M.J. Sinclair, “Wakeon Wireless: An Event Driven Energy Saving Strategy for Battery Operated Devices,” Proc. Of ACM MOBICOM’02, Sep. 2002. J. Ko, J. Kim, S. Cho and K. Lee, “A 19-mW2.6-mm / sup 2 / L1 / L2 dual-band CMOS GPS receiver,” IEEE Journal of Solid-State Circuits, Jul. 2005 . JP 2006-013594 A

  The capacity of a battery that can be mounted on a portable terminal is limited. Therefore, according to the technique described in Non-Patent Document 1, the mobile terminal is forced to consume power based on periodic sensing of the access point. Further, if the time interval of sensing timing is increased in order to reduce power consumption, discovery of an access point for wireless LAN communication is delayed.

  Of course, there is a technology in which a power saving mode is installed in a wireless LAN communication interface. However, this technique is effective only after the connection between the mobile terminal and the access point is completed. That is, the access point becomes effective only after the negotiation of “when to transmit a signal indicating the presence / absence of data” is executed for the mobile terminal. Therefore, when the mobile terminal is present in an area other than the wireless LAN communication area, the power saving mode function cannot be applied. In the end, it is necessary to activate the wireless LAN communication interface at a position where it is unknown whether it exists in the wireless LAN communication area and to sense the access point for a certain time for each channel of the wireless LAN. This eventually leads to power consumption of the mobile terminal.

  Further, according to the technique described in Non-Patent Document 2, a user who possesses a portable terminal forces the user to perform a complicated operation in order to manually select a communication mode. Also, wireless LAN communication is not used in a wireless LAN communication area that is not recognized by the user.

  Furthermore, according to the techniques described in Non-Patent Documents 3 and 4, it is necessary to adopt a special communication method between the cellular communication system and the wireless LAN communication system, and the existing network cannot be used as it is. .

  Furthermore, according to the technique described in Patent Document 1, power consumption can be suppressed by periodic sensing. However, electric power is consumed wastefully while moving in places that are not wireless LAN areas such as outdoors. In addition, when the wireless LAN communication area cannot be found for a certain time or longer, the sensing time interval is extended, so that the discovery of the access point is delayed immediately after entering the wireless LAN communication area such as indoors.

  Therefore, the present invention provides a portable terminal, a program, and a method that can avoid the constant activation of the narrow-area high-speed wireless communication interface from the viewpoint of power consumption without adopting a special communication method in the existing communication system. With the goal.

According to the present invention, in a portable terminal having narrow area high speed wireless communication interface means for communicating with an access point and wide area mobile communication interface means for communicating with a base station ,
Positioning radio wave receiving means for receiving positioning radio waves distributed from a plurality of satellites;
A communication quality determination means for determining whether or not the communication quality value of the radio wave detected by the wide area mobile communication interface means is attenuated below the upper threshold and whether it is attenuated below the lower threshold;
When the communication quality value is attenuated to the lower threshold value within the first predetermined time after the communication quality value is attenuated to the upper threshold value or less, the positioning radio wave receiving means is activated to start receiving the positioning radio wave, and effective positioning is performed. Positioning control means for outputting non-line-of-sight information only when radio waves cannot be received,
When prospects failure information is output to start the short range high speed wireless communication interface means, it possesses a start control means for controlling to discover access points,
Upper threshold is a communication quality of the degree to be detected when the mobile terminal is located outdoors, the lower threshold, that it is a communication quality of the degree to be detected when the mobile terminal is located indoors A mobile terminal characterized by.

According to another embodiment of the mobile terminal of the present invention,
The communication quality determination means further determines whether or not the communication quality value has been attenuated to the lowest threshold or less,
Positioning control means, the communication quality value, Thereafter, during a second predetermined time, when continued in the range from the lower threshold to the lowest threshold, starts receiving the positioning radio wave to start the positioning radio wave receiving means It is also preferable to do.

According to another embodiment of the mobile terminal of the present invention,
The narrow area high speed wireless communication interface means is for wireless LAN (Local Area Network),
When the activated narrow-area high-speed wireless communication interface means discovers the access point, the state where the wide-area mobile communication interface means communicates with the base station is changed to the state where the narrow-area high-speed wireless communication interface means communicates with the access point. It is also preferable to further have a handover control means for performing a handover.

According to another embodiment of the mobile terminal of the present invention,
It further has an activation hold timer means for measuring the activation hold time of the narrow area high speed wireless communication interface means,
The activation control means instructs the activation suspension timer means to start measuring the activation suspension time when the activated narrow area high speed wireless communication interface means cannot find the access point, and as long as the activation suspension time is in progress, It is also preferable to control the narrow area high speed wireless communication interface to stop.

According to the present invention, in a program for causing a computer mounted on a portable terminal having narrow-area high-speed wireless communication interface means to communicate with an access point and wide-area mobile communication interface means to communicate with a base station ,
Positioning radio wave receiving means for receiving positioning radio waves distributed from a plurality of satellites;
A communication quality determination means for determining whether or not the communication quality value of the radio wave detected by the wide area mobile communication interface means is attenuated below the upper threshold and whether it is attenuated below the lower threshold;
When the communication quality value is attenuated to the lower threshold value within the first predetermined time after the communication quality value is attenuated to the upper threshold value or less, the positioning radio wave receiving means is activated to start receiving the positioning radio wave, and effective positioning is performed. Positioning control means for outputting non-line-of-sight information only when radio waves cannot be received,
An activation control means for activating the narrow-area high-speed wireless communication interface means and discovering the access point when unrecognizable information is output;
Make your computer work,
The upper threshold is a communication quality value that is detected when the mobile terminal is located outdoors, and the lower threshold is a communication quality value that is detected when the mobile terminal is located indoors. It is characterized by.

According to the present invention, in a startup method of a narrow area high speed wireless communication system in a mobile terminal having a narrow area high speed wireless communication interface unit communicating with an access point and a wide area mobile communication interface unit communicating with a base station ,
It has a positioning signal receiver that receives positioning signals distributed from multiple satellites ,
When the communication quality value of the radio wave detected by the wide area mobile communication interface unit attenuates below the upper threshold value and then attenuates below the lower threshold value within the first predetermined time, the positioning radio wave reception unit is activated to perform positioning. starts receiving radio waves, only if it can not receive a valid positioning radio wave, a first step you output forecast failure information,
A second step of activating the narrow-area high-speed wireless communication interface unit to detect an access point when the non-line-of-sight information is output ;
Have
The upper threshold is a communication quality value that is detected when the mobile terminal is located outdoors, and the lower threshold is a communication quality value that is detected when the mobile terminal is located indoors. It is characterized by.

  According to the mobile terminal, the program and the method of the present invention, since only the positioning function of the mobile terminal is controlled, there is no need to adopt a special communication method for the existing communication system. In addition, since the constant activation of the narrow-area high-speed wireless communication interface can be avoided, low power consumption can be realized for a portable terminal having a limited battery capacity.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram showing movement of a portable terminal in the present invention.

  According to FIG. 1, the mobile terminal 1 possessed by the user has a wireless LAN communication interface unit that communicates with the access point 4. The wireless LAN communication is, for example, IEEE 802.11. Here, the mobile terminal 1 may further include a cellular communication interface unit that communicates with the base station 3 connected to the mobile phone network 7. The cellular communication is, for example, a CDMA system. By having the wireless LAN communication interface unit and the cellular communication interface unit, handover can be performed between the two communication systems.

  The portable terminal 1 can communicate with the access point 4 for wireless LAN indoors, and can communicate with the base station 3 for cellular outdoors. The access point 4 installed indoors is connected to the Internet 6 via a home gateway 5 installed in the same building 2. The counterpart communication device 8 communicates with the mobile terminal 1 possessed by the user via the access point 4 communicating with the Internet 6 or via the base station 3 connected to the mobile phone network 7. can do.

  The mobile terminal 1 also includes a positioning radio wave receiving unit that receives positioning radio waves from a GPS (Global Positioning System) satellite 9. The positioning radio wave includes the time and orbit information of the satellite. The distance to each satellite can be calculated from the positioning radio waves from the three satellites, and as a result, the position on the earth can be specified.

  According to FIG. 1, the user who has the portable terminal 1 is going to move indoors from the outdoors. At present, wireless LAN communication areas are mainly indoors such as airports, restaurants, hotels, companies, and homes. The mobile terminal 1 can receive positioning radio waves from the satellite 9 when located outdoors, and cannot receive effective positioning radio waves when located indoors. For example, the positioning radio wave itself cannot be received, or effective positioning data cannot be obtained because the strength of the positioning radio wave is weak. When effective positioning radio waves cannot be received in this way, it is assumed that the mobile phone is located indoors, the wireless LAN communication interface is activated, and sensing of the access point is started. Conversely, when you are outdoors where you can receive positioning radio waves, you can stop the wireless LAN communication interface (power off or sleep mode). That is, according to the present invention, whether or not the wireless LAN communication interface is activated is determined according to whether or not a positioning radio wave is received. Thus, when the mobile terminal is located outdoors, it is possible to prevent useless power consumption without sensing an access point.

  FIG. 2 is a graph showing changes in the cellular communication quality value when the mobile terminal moves indoors from outdoors.

  When a portable terminal equipped with a cellular communication interface enters an indoor area, the radio wave of cellular communication is affected by radio wave attenuation caused by obstruction. At this time, the mobile terminal detects the attenuation of the reception quality of the radio wave from the base station. That is, when the mobile terminal enters the indoor area, the penetration rate of radio waves from the base station received by the mobile terminal decreases due to the indoor outer wall or the like.

  The communication quality value of cellular communication includes, for example, DRC (Data Rate Control: a requested rate derived based on C / I of a received pilot). In the graph of FIG. 2, the vertical axis represents the DRC value (Kbps), and the horizontal axis represents the elapsed time (seconds). The DRC value on the vertical axis also represents the lower threshold THlower.

  The change in the communication quality value of the cellular communication in FIG. 2 is specifically assumed when a pedestrian holding the mobile terminal enters the indoor from the automatic door and proceeds through the corridor behind it. It shows the fluctuation of the DRC value. As is apparent from the graph of FIG. 2, the DRC value is greatly attenuated as soon as the portable terminal enters the room. Thereafter, the DRC value lower than the lower threshold THlower continues.

In addition to the DRC value, the following values can also be used as the communication quality value for cellular communication. Of course, a combination of these values may be used.
(1) Received power RxPower
(2) Received signal strength (RSS)
(3) Signal to Interference Ratio (SINR)
(4) Ec / Io (pilot received power / total received power (RSSI))
(5) Packet loss rate (PER)
(6) Frame loss rate FER (Frame Error Rate)

The graph of FIG. 2 represents the following sequence.
(S201) The mobile terminal is located outdoors and is located immediately before entering the room. At this time, the communication quality value of cellular communication is high.

(S202) When the mobile terminal enters indoors, the communication quality value of cellular communication rapidly decreases. Then, when the communication quality value becomes equal to or lower than the lower threshold THlow, the positioning radio wave reception unit of the mobile terminal is activated. The positioning radio wave reception unit starts receiving a positioning radio wave distributed from a GPS satellite.

  The existing GPS receiving unit measures the current position, and needs to receive positioning radio waves from at least three satellites. This is because the position (latitude and longitude) can be specified for the first time by receiving three positioning radio waves.

On the other hand, the positioning radio wave receiving unit 107 of the mobile terminal according to the present invention does not need to measure the current position. It is determined whether or not positioning radio waves have been received. The positioning radio wave receiving unit 107 stops when one positioning radio wave is received or when a predetermined number (for example, two) of positioning radio waves can be received. This is because at that time, it can be estimated that the mobile terminal is located outdoors with a clear view. Here, satellites whose positioning radio waves are weak and have a predetermined reception intensity may be excluded from the predetermined number (for example, two). It is also preferable to introduce a predetermined standby time for determining whether or not a positioning radio wave is received. The predetermined standby time is the time from the activation start time of the positioning radio wave reception unit to the determination of the presence or absence of the positioning radio wave. According to FIG. 2, the predetermined waiting time is, for example, the following time.
Predetermined waiting time = time of S203−time of S202

(S203) When the mobile terminal is located indoors, any one positioning radio wave from a GPS satellite cannot be received. When such a line-of-sight is impossible, the mobile terminal estimates that the mobile terminal is located indoors, activates the wireless LAN communication interface unit, and starts sensing the access point.

(S204) After that, when the wireless LAN communication interface of the mobile terminal finds an access point, it starts wireless LAN communication. Thereby, wireless LAN communication can be started or a handover from cellular communication to wireless LAN communication can be performed.

  FIG. 3 is a functional configuration diagram of the mobile terminal according to the present invention.

  According to FIG. 3, the mobile terminal 1 includes a cellular communication interface unit 101, a wireless LAN communication interface unit 102, a handover control unit 103, a communication quality determination unit 104, an activation control unit 105, and an activation hold timer unit 106. And a positioning radio wave reception unit 107 and a positioning control unit 108. The handover control unit 103, the communication quality determination unit 104, the activation control unit 105, the activation hold timer unit 106, and the positioning control unit 108 are executed by executing a program that causes the computer mounted on the portable terminal 1 to function. realizable. In addition, the activation control unit 105 operates after receiving the positioning radio wave, so that the wireless LAN communication interface can be activated.

The communication quality determination unit 104 determines whether the radio wave communication quality value detected by the cellular communication interface unit 101 satisfies the following conditions. This determination information is notified to the positioning control unit 108.
(Condition 1) Communication quality value attenuated below upper threshold THhigh (Condition 2) Communication quality value attenuated below lower threshold THlow (Condition 3) Communication quality value attenuated below lower threshold THlow-max did

  FIG. 4 is a graph showing the activation timing of the wireless LAN communication interface in the present invention.

  According to FIG. 4, the upper threshold THhigh is a communication quality value that is detected when the mobile terminal 1 is located outdoors. The range between the lower threshold THlow and the lowest threshold THlow-max is a communication quality value that is detected when the mobile terminal 1 is located indoors.

  The positioning control unit 108 may start the positioning radio wave reception unit 107 periodically at predetermined time intervals. According to the prior art, the access point is always sensed regularly regardless of the position of the mobile terminal. On the other hand, according to the present invention, it is possible to always detect positioning radio waves by GPS regardless of the position of the mobile terminal.

  Usually, the power consumption required for receiving positioning radio waves by GPS is lower than the power consumption required for sensing the access point. According to the description of Non-Patent Document 5 or 6, the power consumption in the idle mode of the wireless LAN communication interface is 161 mW, whereas the power consumption of the GPS receiver is 19 mW. In other words, starting the GPS receiving unit is preferable to starting the wireless LAN communication interface from the viewpoint of power consumption of the mobile terminal.

  In addition, it is preferable that the positioning control unit 108 controls the start / stop of the positioning radio wave reception unit 107 according to the determination information notified from the communication quality determination unit 104. For example, there are three control methods as determination information as follows.

  (Control 1) When the communication quality value attenuates below THlow (S402), the positioning control unit 108 activates the positioning radio wave receiving unit 107. When the communication quality value of the radio wave of the cellular communication observed by the mobile terminal is attenuated to the same extent as the indoor communication quality value, the positioning radio wave receiving unit 107 is activated to confirm that the mobile phone has entered the indoor area, Start receiving positioning radio waves distributed from multiple GPS satellites.

  (Control 2) When the communication quality value decays below the upper threshold THhigh (S401) and then decays below the lower threshold THlow within the first predetermined time T1 (S402), the positioning control unit 108 The positioning radio wave receiving unit 107 is activated. Usually, for example, when a pedestrian enters indoors from outside, the communication quality value of the radio wave of cellular communication observed by the mobile terminal is attenuated at a stretch within a relatively short time. Therefore, in order to confirm that the portable terminal has entered the indoor when the mobile terminal has attenuated to the same degree as the communication quality value that has entered the indoor from the outside within the relatively short time, the positioning radio wave receiving unit 107 is Start up and start receiving positioning radio waves distributed from multiple GPS satellites.

  (Control 3) When the communication quality value continues in the range from the lower threshold THlow to the lowest threshold THlow-max for the second predetermined time T2 (S403), the positioning controller 108 receives the positioning radio wave receiver 107 is started. Even when the portable terminal is in the indoor state, the portable terminal receives a radio wave of cellular communication having a relatively low communication quality. Accordingly, when the communication quality value of the degree that the portable terminal has entered the indoor from the outside continues for the second predetermined time T2, the positioning radio wave receiving unit 107 is activated to confirm that the portable terminal has entered the indoor, Start receiving positioning signals.

  The positioning control unit 108 outputs the unavailability information to the activation control unit 105 only when the positioning radio wave receiving unit 107 cannot receive the positioning radio wave.

  The activation control unit 105 activates the wireless LAN communication interface unit 102 to detect an access point when the line-of-sight information is output.

  The activation hold timer unit 106 measures the activation hold time of the positioning radio wave reception unit 107.

  When the activated wireless LAN communication interface unit 102 cannot find an access point, the activation control unit 105 instructs the activation suspension timer unit 106 to start measuring the activation suspension time. The activation control unit 105 controls the positioning radio wave reception unit 107 to stop as long as the activation suspension time is in progress.

  When the activated wireless LAN communication interface unit 102 discovers an access point, the handover control unit 103 communicates with the base station 3 through the cellular communication interface unit 101, and the wireless LAN communication interface unit 102 uses the access point. 4 to control the handover to a state of communicating with

  As described above in detail, according to the mobile terminal, the program, and the method of the present invention, since only the positioning function of the mobile terminal is controlled, it is not necessary to adopt a special communication method for the existing communication system. In addition, since the constant activation of the narrow-area high-speed wireless communication interface can be avoided, low power consumption can be realized for a portable terminal having a limited battery capacity.

  According to the various embodiments of the present invention described above, those skilled in the art can easily make various changes, modifications and omissions within the scope of the technical idea and the viewpoint of the present invention. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

It is a system configuration figure showing movement of a portable terminal in the present invention. It is a graph showing the change of the cellular communication quality value when a portable terminal moves indoors from the outdoors. It is a functional block diagram of the portable terminal in this invention. It is a graph showing the starting timing of the wireless LAN communication interface in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile terminal 101 Cellular communication interface part, Wide area mobile communication interface part 102 Wireless LAN communication interface part, Narrow area high-speed wireless communication interface part 103 Handover control part 104 Communication quality judgment part 105 Start control part 106 Start hold timer part 107 Positioning radio wave reception Unit 108 Positioning control unit 2 Building 3 Base station 4 Access point 5 Home gateway 6 Internet 7 Mobile phone network 8 Remote communication device 9 GPS satellite

Claims (6)

In a portable terminal having narrow area high speed wireless communication interface means for communicating with an access point and wide area mobile communication interface means for communicating with a base station ,
Positioning radio wave receiving means for receiving positioning radio waves distributed from a plurality of satellites;
Communication quality determination means for determining whether or not the communication quality value of the radio wave detected by the wide area mobile communication interface means is attenuated below an upper threshold and whether it is attenuated below a lower threshold;
When the communication quality value is attenuated to the lower threshold value within the first predetermined time after the communication quality value is attenuated to the upper threshold value or less, the positioning radio wave receiving means is activated to start receiving the positioning radio wave signal. And positioning control means for outputting non-line-of-sight information only when a valid positioning signal cannot be received,
When the prospect failure information is output, activating the short range high speed wireless communication interface means, it possesses a start control means for controlling to discover the access point,
The upper threshold is a communication quality value that is detected when the mobile terminal is located outdoors, and the lower threshold is a communication quality value that is detected when the mobile terminal is located indoors. mobile terminal characterized by and a call. The communication quality determination means further determines whether or not the communication quality value has attenuated to a lower threshold or less,
Said positioning control means, the communication quality value, Thereafter, during a second predetermined time, when continued in the range from the lower threshold to the lowest threshold, before start the positioning radio wave receiving means The mobile terminal according to claim 1 , wherein reception of the positioning radio wave is started. The narrow area high speed wireless communication interface means is for wireless LAN (Local Area Network),
When the activated narrow-area high-speed wireless communication interface means discovers the access point, the access is made by the narrow-area high-speed wireless communication interface means from the state in which the narrow-area high-speed wireless communication interface means communicates with the base station by the wide-area mobile communication interface means. the mobile terminal according to claim 1 or 2, further comprising a handover control unit for handover to a state of communicating with the point. Further comprising an activation hold timer means for measuring the activation hold time of the narrow area high speed wireless communication interface means,
The activation control means instructs the activation suspension timer means to start measuring the activation suspension time when the activated narrow area high speed wireless communication interface means cannot find the access point, and the activation suspension time advances. and as long as that, the portable terminal according to any one of claims 1 to 3, characterized in that control to stop the narrow-area high-speed wireless communication interface. In a program for functioning a computer mounted on a portable terminal having a narrow area high speed wireless communication interface means for communicating with an access point and a wide area mobile communication interface means for communicating with a base station ,
Positioning radio wave receiving means for receiving positioning radio waves distributed from a plurality of satellites;
Communication quality determination means for determining whether or not the communication quality value of the radio wave detected by the wide area mobile communication interface means is attenuated below an upper threshold and whether it is attenuated below a lower threshold;
When the communication quality value is attenuated to the lower threshold value within the first predetermined time after the communication quality value is attenuated to the upper threshold value or less, the positioning radio wave receiving means is activated to start receiving the positioning radio wave signal. And positioning control means for outputting non-line-of-sight information only when a valid positioning signal cannot be received,
Activation control means for activating the narrow-area high-speed wireless communication interface means when the non-line-of-sight information is output, and controlling the discovery of the access point;
Make your computer work,
The upper threshold is a communication quality value that is detected when the mobile terminal is located outdoors, and the lower threshold is a communication quality value that is detected when the mobile terminal is located indoors. There is a program for a portable terminal. In a starting method of a narrow-area high-speed wireless communication system in a mobile terminal having a narrow-area high-speed wireless communication interface section communicating with an access point and a wide-area mobile communication interface section communicating with a base station ,
It has a positioning signal receiver that receives positioning signals distributed from multiple satellites ,
When the communication quality value of the radio wave detected by the wide area mobile communication interface unit is attenuated below the upper threshold value after being attenuated below the upper threshold value, the positioning radio wave reception unit is activated when it is attenuated below the lower threshold value within a first predetermined time. the reception of the positioning radio wave starts Te, only if it can not receive a valid positioning radio wave, a first step you output forecast failure information,
A second step of activating the narrow-area high-speed wireless communication interface unit when the non-line-of-sight information is output, and controlling to discover the access point ;
Have
The upper threshold is a communication quality value that is detected when the mobile terminal is located outdoors, and the lower threshold is a communication quality value that is detected when the mobile terminal is located indoors. Starting the narrow-range high-speed wireless communication system in a mobile terminal, characterized in that.

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