JP2011217095A - Distribution information acquisition method of controlling startup of wireless lan interface, mobile terminal, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distribution information acquisition method and the like by which a mobile terminal can achieve power saving by turning on a power source of a wireless LAN interface only when distribution information from an application server is generated.SOLUTION: A mobile terminal records connection history in which a base station position information of a wireless WAN and access point connection information of a wireless LAN are corresponded to each other. First of all, a push server transmits a call message to the mobile terminal via the wireless WAN. The mobile terminal acquires the base station position information of the wireless WAN, and searches the access point connection information corresponding to the base station position information using the connection history. Then, the mobile terminal turns on a power source of the wireless LAN interface to receive distribution information from an application server via an access point of the wireless LAN. Finally, the mobile terminal turns off the power source of the wireless LAN interface.

Description

  The present invention relates to a technique in which a mobile terminal acquires distribution information from an application server via a wireless LAN (Local Area Network). In particular, the present invention relates to a technique for realizing power saving of a wireless LAN interface in a waiting state for distribution information for a mobile terminal.

  Wireless WAN (Wide Area Network) typified by mobile phone communication is widespread as wide area communication, and wireless LAN typified by IEEE 802.11a / b / g is widespread as narrow area communication. Corresponding to such a communication environment, mobile terminals (including mobile phones, mobile terminals (PDA: Personal Digital Assistant) and personal computers) having both a wireless WAN interface and a wireless LAN interface have become widespread. ing. Such a mobile terminal can switch a plurality of communication interfaces so as to use cellular phone communication outdoors and to use a wireless LAN on the premises. The wireless WAN includes, for example, WiMAX (Worldwide Interoperability for Microwave Access), LTE (Long Term Evolution), or UMB (Ultra Mobile Broadband).

  Here, a reduction in power consumption that is directly related to the continuous use time is always a problem for mobile terminals. In an application such as Web browsing, an appropriate communication interface may be turned on when necessary according to a user operation. However, in applications such as incoming mail, presence information update, RSS (RDF (Resource Description Framework) Site Summary) automatic distribution, etc. Must be turned on. In particular, power consumption by the wireless LAN interface is not negligible for a portable and small mobile terminal due to its battery capacity. Therefore, it is not desirable for the mobile terminal to keep the plurality of communication interfaces powered on from the viewpoint of reducing power consumption.

  First, there is a technology in which a mobile terminal having a wide area communication network interface and a wireless LAN interface waits for call connection with low power consumption (see, for example, Patent Document 1). Specifically, the mobile terminal transmits a REGISTER including a power-off state to a local SIP (Session Initiation Protocol) server via a wireless LAN communication network, and turns off the power of the wireless LAN interface. Thereafter, when the local SIP server accepts an incoming call from the calling terminal, the call connection for the incoming call is suspended. Next, the local SIP server calls the mobile terminal via the wide area wireless communication network, and the mobile terminal turns on the power of the wireless LAN interface. Then, the mobile terminal transmits a REGISTER including a power-on state to the local SIP server via the wireless LAN interface, and the local SIP server releases the call connection that is on hold, and the mobile terminal and the calling terminal Make a call connection between them.

  Second, there is a technique in which a mobile terminal uses cellular communication base station information and a connection history to a wireless LAN access point in order to reduce the search frequency of an access point that automatically connects to a wireless LAN access point. (For example, refer to Patent Document 2). Specifically, the mobile terminal records CDMA (Code Division Multiple Access) base station information when connected to a wireless LAN access point. Thus, the access point of the wireless LAN is searched only when moving to the CDMA base station area.

JP 2010-021661 A JP 2009-201104 A

  However, according to the technique described in Patent Document 1, the power input state of the wide area wireless interface and the wireless LAN interface of the mobile terminal must be held in the local SIP server. For this reason, a function for saving the state of the mobile terminal must be added to a general local SIP server, which increases costs. Moreover, it is intended for incoming voice calls, and does not assume applications such as mail reception, presence information distribution, and RSS notification.

  Further, according to the technique described in Patent Document 2, the connection is automatically made while suppressing power consumption to the access point of the wireless LAN. Therefore, it is necessary to always keep the wireless LAN interface on after the wireless LAN connection. Alternatively, the mode shifts to an operation mode based on the power saving mode of IEEE802.11 mounted on a general mobile phone. However, since broadcast packets and the like in the same network are received, the power consumption mode in the wireless LAN area is large in the operation in the power saving mode of IEEE802.11.

  Therefore, the present invention provides a distribution information acquisition method, a mobile terminal, and a program for realizing power saving by turning on a wireless LAN interface only when a mobile terminal generates distribution information from an application server. The purpose is to provide.

According to the present invention,
A wireless WAN (Wide Area Network) and a wireless LAN (Local Area Network) are connected to the wide area communication network, and can be connected to the push server and application server connected to the wide area communication network, and to the wireless WAN and the wireless LAN. A mobile terminal distribution information acquisition method in a system having a mobile terminal,
The mobile terminal can acquire the base station position information from the wireless WAN, and records the connection history as the base station position information and the access point connection information in association with the access point via the wireless LAN. And
A first step in which the push server sends a message signifying the occurrence of distribution information in the application server to the mobile terminal via the wireless WAN;
When the mobile terminal receives the message, the mobile terminal obtains base station position information from the base station of the wireless WAN, and uses the connection history to search for access point connection information corresponding to the base station position information. Steps,
A third step in which the mobile terminal turns on the power of the wireless LAN interface;
A fourth step in which the mobile terminal connects to the access point based on the access point connection information via the wireless LAN;
A fifth step in which the mobile terminal transmits a distribution request to the application server via the access point and receives distribution information as a response;
The mobile terminal has a sixth step of turning off the power of the wireless LAN interface.

  According to another embodiment of the distribution information acquisition method of the present invention, the message is preferably a center push call message in a short mail.

  According to another embodiment of the distribution information acquisition method of the present invention, the base station position information is preferably an identifier (IDentifier) uniquely assigned to the base station of the wireless WAN.

  According to another embodiment of the distribution information acquisition method of the present invention, the base station of the wireless WAN reports the latitude / longitude of the base station, and the base station position information is the latitude / longitude of the base station. It is also preferable.

According to another embodiment of the distribution information acquisition method of the present invention, the mobile terminal
When connecting to a wireless LAN access point that is not included in the connection history, it receives the positioning radio wave from the GPS (Global Positioning System) satellite to measure the latitude and longitude as the connection position,
And latitude and longitude of the base station, the distance between the latitude and longitude of the connection position r _{a (the} difference latitude and longitude) is calculated,
The distance r _a recorded in the connection history,
After that, when base station position information different from the base station position information recorded in the connection history is received from another base station, the latitude / longitude of the other base station and the latitude / longitude of the connection position Calculate the distance r _b (difference between latitude and longitude)
Distance r _b is shorter than the alpha × r _a based on a predetermined value alpha, it is also preferable that after the third step is performed.

According to another embodiment of the distribution information acquisition method of the present invention,
In the connection history, the time when the mobile terminal connected to the access point is further recorded,
As for the second step, when the mobile terminal receives a message, when a plurality of access point connection information is associated with the base station position information from the connection history, the access point connection information with the latest time Is also preferably searched.

According to another embodiment of the distribution information acquisition method of the present invention,
If the access point connection information could not be retrieved for the second step,
Regarding the fourth step, if the connection with the access point fails, or
For the fourth step, if the connection with the application server via the wireless LAN fails,
In the fifth step, it is also preferable that the mobile terminal transmits a distribution request to the application server via the wireless WAN and receives distribution information as a response thereto.

According to the present invention, a wireless WAN and a wireless LAN are mutually connected to a wide area communication network, and a mobile terminal communicating with a push server and an application server connected to the wide area communication network can be connected to the wireless WAN and the wireless LAN. Mobile terminal,
Base station location information acquisition means for acquiring base station location information from the wireless WAN;
Connection history recording means for recording the access point connection information and the base station position information in association with each other when connecting to the access point via the wireless LAN;
Message receiving means for receiving a message signifying the occurrence of distribution information in the application server from the push server via the wireless WAN;
An access point search means for acquiring base station position information from the base station of the wireless WAN when the message is received, and searching for access point connection information corresponding to the base station position information using a connection history;
Power access control means for turning on the wireless LAN interface after receiving the distribution information from the application server after turning on the power of the wireless LAN interface when the access point connection information can be retrieved from the connection history, and the wireless LAN interface Access point connection means for controlling connection to the access point based on the access point connection information,
It has a distribution information acquisition means for transmitting a distribution request to an application server via an access point using a wireless LAN interface and receiving distribution information as a response.

  According to another embodiment of the mobile terminal of the present invention, the message is preferably a center push call message in a short mail.

  According to another embodiment of the mobile terminal of the present invention, the base station location information is preferably an identifier uniquely assigned to a base station of a wireless WAN.

  According to another embodiment of the mobile terminal of the present invention, the base station of the wireless WAN reports the latitude / longitude of the base station, and the base station position information may be the latitude / longitude of the base station. preferable.

According to another embodiment of the mobile terminal of the present invention,
Positioning means for positioning latitude / longitude as a connection position by receiving positioning radio waves from a GPS (Global Positioning System) satellite when connected to a wireless LAN access point not included in the connection history;
It has a latitude and longitude of the base station, and a distance determination means for calculating a distance r _a between the latitude and longitude of the connecting position _(the difference between the latitude and longitude),
Connection history is further recorded to the distance r _a,
When the base station position information different from the base station position information recorded in the connection history is received from the other base station, the distance determination means receives the latitude / longitude of the other base station and the latitude / longitude of the connection position. Calculate distance r _b (latitude / longitude difference) from longitude,
Distance r _b is shorter than the alpha × r _a based on a predetermined value alpha, it is also preferable that the power supply control unit, the access point connection means and the delivery information acquiring unit to function.

According to another embodiment of the mobile terminal of the present invention,
The connection history recording means further records the time of connection to the access point in the connection history,
When a plurality of access point connection information is associated with the base station position information from the connection history when receiving a message, the access point search means searches in order from the access point connection information with the latest time. It is also preferable.

According to another embodiment of the mobile terminal of the present invention,
If the access point search means could not search for access point connection information,
When the distribution information acquisition means fails to connect to the access point, or
When the distribution information acquisition unit fails to connect to the application server via the wireless LAN,
The distribution information acquisition means preferably transmits a distribution request to the application server via the wireless WAN and receives the distribution information as a response thereto.

According to the present invention, a wireless WAN and a wireless LAN are mutually connected to a wide area communication network, and a mobile terminal communicating with a push server and an application server connected to the wide area communication network can be connected to the wireless WAN and the wireless LAN. A program for operating a computer installed in a mobile terminal,
Base station location information acquisition means for acquiring base station location information from the wireless WAN;
Connection history recording means for recording the access point connection information and the base station position information in association with each other when connecting to the access point via the wireless LAN;
Message receiving means for receiving a message signifying the occurrence of distribution information in the application server from the push server via the wireless WAN;
An access point search means for acquiring base station position information from the base station of the wireless WAN when the message is received, and searching for access point connection information corresponding to the base station position information using a connection history;
Power access control means for turning on the wireless LAN interface after receiving the distribution information from the application server after turning on the power of the wireless LAN interface when the access point connection information can be retrieved from the connection history, and the wireless LAN interface Access point connection means for controlling connection to the access point based on the access point connection information,
Using a wireless LAN interface, a distribution request is transmitted to an application server via an access point, and the computer is caused to function as distribution information acquisition means for receiving distribution information as a response.

  According to the distribution information acquisition method, mobile terminal, and program of the present invention, the mobile terminal realizes power saving by turning on the wireless LAN interface only when distribution information is generated from the application server. .

It is a system configuration diagram in the present invention. It is a sequence diagram in the present invention. It is a sequence diagram when distribution information cannot be received via a wireless LAN. It is explanatory drawing in which a mobile terminal connects to an access point by the base station position information received from another base station. It is a function block diagram of the mobile terminal in this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram according to the present invention.

  According to FIG. 1, a cellular phone network 50 and an access network 60 are connected to the Internet 4 as a wide area communication network. Further, according to FIG. 1, an application server 3 that transmits distribution information to the mobile terminal 1 and a push server 2 that transmits a call message to the mobile terminal 1 are connected to the mobile phone network 50.

  The mobile terminal 1 has a wireless WAN interface and a wireless LAN interface. The wireless WAN interface communicates with the base station 51 of the mobile phone network 50. The wireless LAN interface communicates with the access point 61 of the access network 60. The access point 61 also has a DHCP (Dynamic Host Configuration Protocol) function for assigning an IP address to the mobile terminal 1. Further, the mobile terminal 1 can receive a positioning radio wave from the GPS satellite 7 and perform positioning.

  FIG. 2 is a sequence diagram in the present invention.

(S201) The mobile terminal 1 acquires base station position information from the base station 51 of the wireless WAN. The base station position information may be an identifier (IDentifier) uniquely assigned to the base station. Further, the base station position information may be the latitude / longitude of the base station. The base station 51 always broadcasts base station position information.

(S202) It is assumed that the mobile terminal 1 turns on the wireless LAN interface and connects to the access point.

(S203) The mobile terminal 1 records a connection history in which access point connection information is associated with base station position information. Here, a plurality of pieces of access point connection information may be associated with one base station position information. A plurality of pieces of base station position information may be associated with one access point connection information.

Table 1 below represents a connection history table.

  According to Table 1, it is clear that one mobile terminal has received base station position information from three base stations. For example, when the wireless WAN is CDMA (Code Division Multiple Access), a site diversity method is adopted. According to the site diversity method, radio waves transmitted simultaneously from a plurality of base stations can be combined on the mobile terminal side. As a result, even when the received power at the mobile terminal is not sufficient, the bit error rate characteristics can be improved.

The connection history may further record the time when the mobile terminal connected to the access point. The history information after a predetermined time has elapsed from that time may be deleted. Furthermore, the connection history is further recorded also connection position information and the distance r _a. This will be described later with reference to FIG.

  Thereafter, the mobile terminal 1 turns off the wireless LAN interface.

(S211) Thereafter, it is assumed that distribution information for the mobile terminal 1 is generated in the application server 3. At this time, the application server 3 transmits a trigger message to the push server 2. On the other hand, the push server 2 transmits a call message to the mobile terminal 1 via the wireless WAN based on the mobile phone network 50. At this time, the mobile terminal 1 receives the call message and also acquires base station position information from the base station 51 of the wireless WAN.

  The call message may be a center push call message in short mail. This short message preferably includes an application type relating to distribution information such as “E-mail” or “Web browser”. As a result, it is possible to identify an application that is activated when distribution information is acquired. Further, the IP address or FQDN (Fully Qualified Domain Name) of the server as the connection destination may be included.

(S212) The mobile terminal 1 searches for access point connection information corresponding to the base station position information using the connection history. Here, a plurality of access point connection information may be searched for one base station position information.

(S213) The mobile terminal 1 turns on the power of the wireless LAN interface.

(S214) The mobile terminal 1 searches for an access point based on the access point connection information searched in S212 via the wireless LAN, and connects to the access point. Here, when a plurality of access point connection information is searched, it is also preferable to search in order from the access point connection information with the latest time.

  The mobile terminal 1 acquires an IP address from the DHCP function of the access point 61.

(S215) The mobile terminal 1 transmits a distribution request to the application server 3 via the access point 61. As a response, the application server 3 transmits distribution information to the mobile terminal 1.

(S216) The mobile terminal 1 releases the IP address to the DHCP function of the access point 61. Then, the mobile terminal 1 turns off the power of the wireless LAN interface.

  FIG. 3 is a sequence diagram when distribution information cannot be received via a wireless LAN.

FIG. 3 corresponds to the sequence number of FIG.
(S212) The mobile terminal 1 searches for access point connection information corresponding to the base station position information using the connection history. If the access point connection information cannot be acquired, the process proceeds to S221.
(S213) If the mobile terminal 1 fails to connect to the access point 61 based on the access point connection information searched in S212 via the wireless LAN, the mobile terminal 1 proceeds to S221.
(S215) If the mobile terminal 1 fails to connect to the application server 3 via the wireless LAN, the mobile terminal 1 proceeds to S221.
(S221) The mobile terminal 1 transmits a distribution request to the application server 3 via the wireless WAN. As a response, distribution information is received from the application server 3.

  FIG. 4 is an explanatory diagram in which a mobile terminal connects to an access point based on base station position information received from another base station.

  According to the present invention described above, when a mobile terminal moves, it searches for access point connection information based on base station position information acquired from the base station, and connects to the access point based on the access point connection information. . For this search, a connection history in which position information of a base station covering a wide range and connection information of an access point covering a narrow range are associated is used. However, many access point connection information is often associated with one base station position information. Therefore, according to FIG. 4, an index regarded as “periphery” as seen from the base station position information is clarified.

  The installation density of base stations in a wireless WAN varies between cities and regions. Therefore, it is not appropriate to fix the “periphery” as viewed from the base station. As a result, in the case of safety operation, an access point is searched in a wider range, and eventually it takes a relatively long time to connect to the access point.

  According to FIG. 4 (a), the mobile terminal 1 receives base station position information from the base station a. Next, the mobile terminal 1 is connected to the access point A via a wireless LAN. Here, it is assumed that the wireless LAN access point to be connected is not included in the connection history. In this case, the mobile terminal 1 measures the latitude / longitude as the connection position by receiving the positioning radio wave from the GPS satellite only once. The latitude and longitude are almost the same as the position of the access point. Note that the measured latitude / longitude may include some errors. This connection position is recorded in the connection history.

Then, the mobile terminal 1, calculates the latitude and longitude of the base station, the distance between the latitude and longitude of the connection position r _{a (difference} latitude and longitude). According to Fig.4 (a), it calculates as follows.
(Base station a- connection position): Distance _{r a}
Finally, the mobile terminal 1 associates the base station position information of the base station a with the connection position information and records them in the connection history. Also, the distance r _a, is recorded in the connection history.

Thereafter, according to FIG. 4B, it is assumed that the mobile terminal 1 has received from the base station b base station position information different from the base station position information recorded in the connection history. In this case, the mobile terminal 1 calculates an already connected position information of the connection history is recorded (X1, Y1), latitude and longitude (Xb, Yb) of the base station b the distance r _b between. According to FIG.4 (b), it determines with the following formula | equation as a parameter | index considered as "periphery".
(Base station b- connection position): distance _{r b}
Distance r _b <(α × distance r _a )
α: Parameter α is a constant value that does not need to be changed between cities and regions. This is because the difference in the arrangement density of wireless WAN base stations is absorbed by r itself.

When the distance r _b <(α × distance r _a ), the mobile terminal 1 searches for the access point A even when the base station position information is received from the base station b. That is, only in that case, the power of the wireless LAN interface is turned on. Further, when the mobile terminal 1 can connect by searching for the access point A, the base station location information of the base station b is further recorded in the connection history in association with the access point connection information of the access point A. Is also preferable.

  FIG. 5 is a functional configuration diagram of the mobile terminal in the present invention.

  According to FIG. 5, the mobile terminal 1 includes a wireless WAN interface 101, a wireless LAN interface 102, and a positioning unit 103. The wireless WAN interface 101 is connected to a base station 51 of a mobile phone network, for example. The wireless LAN interface 102 is connected to a wireless LAN access point 61. The wireless LAN interface 102 is controlled to be turned on or off. The positioning unit 103 receives a positioning radio wave from a GPS satellite and measures the latitude / longitude as a connection position.

  Further, according to FIG. 5, the mobile terminal 1 includes a base station location information acquisition unit 111, a connection history recording unit 112, a message reception unit 113, an access point search unit 114, a power control unit 115, an access point, A connection unit 116, a distribution information acquisition unit 117, a distance determination unit 118, and an application processing unit 119 are included. These functional components excluding the communication interface are realized by executing a program that causes a computer installed in the mobile terminal to function.

  The base station position information acquisition unit 111 acquires base station position information from the wireless WAN when connected to the access point via the wireless LAN. Base station position information and access point connection information are output to the connection history recording unit 112. Base station position information is also output to access point search section 114 in response to a request.

  The connection history recording unit 112 records base station position information and access point connection information in association with each other. A plurality of pieces of access point connection information may be associated with one base station position information. Here, it is preferable that the connection history recording unit 112 further records the time of connection to the access point. It is also preferable to record the current position of the positioning result of the mobile terminal at the time of recording as the connection position.

  The message receiving unit 113 receives a call message indicating generation of distribution information in the application server from the push server via the wireless WAN. The fact is output to the access point search unit 114.

  When the access point search unit 114 receives a message via the wireless WAN, the access point search unit 114 acquires the base station location information of the wireless WAN from the base station location information acquisition unit 111. Then, using the connection history recording unit 112, the access point connection information corresponding to the base station position information is searched. When the access point search unit 114 can search the access point connection information from the connection history recording unit 112, the access point search unit 114 outputs that fact to the power supply control unit 115. Further, the searched access point connection information is output to the access point connection unit 116.

  Further, when a plurality of pieces of access point connection information are associated with the base station position information, the access point search unit 114 searches in order from the access point connection information with the latest time.

  When the access point connection information can be acquired from the connection history, the power control unit 115 turns on the power of the wireless LAN interface. Also, after receiving distribution information from the application server, the wireless LAN interface is turned off.

  The access point connection unit 116 controls the connection to the access point based on the access point connection information for the wireless LAN interface.

  The distribution information acquisition unit 117 transmits a distribution request to the application server via the access point using the wireless LAN interface. As a response, the distribution information is received. The received distribution information is output to the application processing unit 119.

Distance determining unit 118 calculates the latitude and longitude of the base station, the distance between the latitude and longitude of the connection position r _{a (difference} latitude and longitude). It is assumed that the base station in the wireless WAN always informs the latitude / longitude of the base station. In addition, when the positioning unit 103 is connected to a wireless LAN access point that is not included in the connection history, the positioning unit 103 receives the positioning radio wave from the GPS satellite only once to measure the latitude / longitude as the connection position. The calculated distance r _a is recorded on the connection history.

After that, the distance determination unit 118 receives the base station position information different from the base station position information recorded in the connection history from the other base station, and the latitude / longitude of the other base station and the connection position. and calculates the distance between the latitude and longitude r _{b (difference} latitude and longitude). Then, the distance _{r b} is shorter than the alpha × _{r a} based on a predetermined value alpha, the power control unit 115, access point connection portion 116 and the delivery information acquiring unit 117 to function. As a result, even when base station position information is received from a base station not recorded in the connection history, an access point can be searched.

  As described above in detail, according to the distribution information acquisition method, mobile terminal, and program of the present invention, the mobile terminal turns on the wireless LAN interface only when distribution information is generated from the application server. To achieve power saving. In particular, when the wireless LAN interface is powered on, there is no need to wait for a long time, reducing power consumption and connecting to the application server using the wireless LAN only when distribution information is generated.

  In particular, it is intended for applications in which the occurrence of distribution information is notified via a wide-area communication network, such as mail reception, and applications in which a mobile terminal accesses a server and acquires information at a specified time. Since the mobile terminal itself determines whether to acquire information using a wireless LAN interface or a wide area wireless communication interface, a server for managing on / off information of the interface of the mobile terminal is unnecessary. Further, since the wireless LAN interface is always turned off during standby when communication is not being performed, power consumption can be suppressed even within the wireless LAN access point area.

  Various changes, modifications, and omissions of the above-described various embodiments of the present invention can be easily made by those skilled in the art. 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.

DESCRIPTION OF SYMBOLS 1 Mobile terminal 101 Wireless WAN interface 102 Wireless LAN interface 103 Positioning part 111 Base station position information acquisition part 112 Connection history recording part 113 Message receiving part 114 Access point search part 115 Power supply control part 116 Access point connection part 117 Distribution information acquisition part 118 Distance determination unit 119 Application processing unit 2 Push server 3 Application server 4 Internet 50 Wireless WAN, cellular phone network 51 Base station 60 Access network 61 Access point 7 GPS satellite

Claims (15)

A wireless WAN (Wide Area Network) and a wireless LAN (Local Area Network) are connected to a wide area communication network, and are connected to the push server and application server connected to the wide area communication network, and to the wireless WAN and the wireless LAN. A mobile terminal distribution information acquisition method in a system having a mobile terminal,
The mobile terminal can acquire base station location information from the wireless WAN, and connects the base station location information and access point connection information in association with each other when connected to the access point via the wireless LAN. Recorded as a history,
A first step in which the push server transmits a message indicating generation of distribution information in the application server to the mobile terminal via the wireless WAN;
When the mobile terminal receives the message, it acquires base station location information from the base station of the wireless WAN, and searches for access point connection information corresponding to the base station location information using the connection history. A second step;
A third step in which the mobile terminal turns on the power of the wireless LAN interface;
A fourth step in which the mobile terminal connects to an access point based on the access point connection information via the wireless LAN;
A fifth step in which the mobile terminal transmits a distribution request to the application server via the access point and receives the distribution information as a response;
A mobile terminal distribution information acquisition method comprising: a sixth step of turning off the power of the wireless LAN interface by the mobile terminal.   The method according to claim 1, wherein the message is a center push call message in a short mail.   The method according to claim 1 or 2, wherein the base station position information is an identifier uniquely assigned to a base station of the wireless WAN. The wireless WAN base station reports the latitude and longitude of the base station,
3. The mobile terminal distribution information acquisition method according to claim 1, wherein the base station position information is latitude / longitude of the base station. The mobile terminal
When connecting to a wireless LAN access point that is not included in the connection history, it receives the positioning radio wave from the GPS (Global Positioning System) satellite to measure the latitude and longitude as the connection position,
The calculated latitude and longitude of the base station, the distance between the latitude and longitude of the connection position r _{a (difference} latitude and longitude),
Recording the distance r _a connection history,
Thereafter, when base station position information different from the base station position information recorded in the connection history is received from another base station, the latitude / longitude of the other base station and the latitude / longitude of the connection position Distance r _b (difference between latitude and longitude)
It said distance if r _b is shorter than the alpha × r _a based on a predetermined value alpha, the delivery information acquisition method of a mobile terminal according to claim 4, characterized in that the third and subsequent steps are executed. In the connection history, the time when the mobile terminal connected to the access point is further recorded,
As for the second step, when the mobile terminal receives the message, when a plurality of access point connection information is associated with the base station position information from the connection history, the time is the latest 6. The mobile terminal distribution information acquisition method according to claim 1, wherein access point connection information is searched. If the access point connection information could not be retrieved for the second step,
For the fourth step, if the connection with the access point fails, or
For the fourth step, if the connection with the application server via the wireless LAN fails,
7. The mobile terminal according to claim 1, wherein in the fifth step, the mobile terminal transmits a distribution request to the application server via the wireless WAN, and receives the distribution information as a response thereto. The delivery information acquisition method of the mobile terminal according to item 1. A mobile terminal in which a wireless WAN and a wireless LAN are connected to a wide area communication network and communicates with a push server and an application server connected to the wide area communication network. The mobile terminal is connectable to the wireless WAN and the wireless LAN. Because
Base station location information acquisition means for acquiring base station location information from the wireless WAN;
Connection history recording means for recording the access point connection information and the base station position information in association with each other when connected to the access point via the wireless LAN;
Message receiving means for receiving from the push server, via the wireless WAN, a message signifying occurrence of distribution information in the application server;
An access point search means for acquiring base station position information from a base station of the wireless WAN and searching for access point connection information corresponding to the base station position information using the connection history when the message is received; ,
When the access point connection information can be retrieved from the connection history, the power to turn on the wireless LAN interface and turn on the wireless LAN interface after receiving the distribution information from the application server An access point connection means for controlling connection to an access point based on the access point connection information using a control means and the wireless LAN interface;
A mobile terminal comprising: distribution information acquisition means for transmitting a distribution request to the application server via the access point using the wireless LAN interface and receiving the distribution information as a response.   The mobile terminal according to claim 8, wherein the message is a center push call message in a short mail.   The mobile terminal according to claim 9 or 10, wherein the base station location information is an identifier uniquely assigned to a base station of the wireless WAN. The wireless WAN base station reports the latitude and longitude of the base station,
The mobile terminal according to claim 8 or 9, wherein the base station position information is latitude / longitude of the base station. Positioning means for positioning latitude / longitude as a connection position by receiving positioning radio waves from a GPS (Global Positioning System) satellite when connected to a wireless LAN access point not included in the connection history;
And a distance determination means for calculating the latitude and longitude of the base station, the distance between the latitude and longitude of the connection position r _{a (difference} latitude and longitude),
The connection history may further record the distance r _a,
When the distance determination means receives base station position information different from the base station position information recorded in the connection history from another base station, the latitude / longitude of the other base station and the connection position calculates the distance between the latitude and longitude r _{b (difference} latitude and longitude),
The distance r _b is shorter than the alpha × r _a based on a predetermined value alpha, the power control unit of claim 11, wherein the access point connection means and the delivery information acquiring means functions Mobile terminal. The connection history recording means further records the time of connection to the access point in the connection history,
The access point search means, when receiving the message, when a plurality of access point connection information is associated with the base station position information from the connection history, the access point connection with the latest time The mobile terminal according to claim 8, wherein search is performed in order from information. If the access point search means could not search the access point connection information,
When the distribution information acquisition unit fails to connect to the access point, or
When the distribution information acquisition unit fails to connect to the application server via the wireless LAN,
The distribution information acquisition means transmits a distribution request to the application server via the wireless WAN and receives the distribution information as a response thereto. Mobile terminals. A mobile terminal in which a wireless WAN and a wireless LAN are connected to a wide area communication network and communicates with a push server and an application server connected to the wide area communication network. The mobile terminal is connectable to the wireless WAN and the wireless LAN. A program for operating a computer installed in
Base station location information acquisition means for acquiring base station location information from the wireless WAN;
Connection history recording means for recording the access point connection information and the base station position information in association with each other when connected to the access point via the wireless LAN;
Message receiving means for receiving from the push server, via the wireless WAN, a message signifying occurrence of distribution information in the application server;
An access point search means for acquiring base station position information from a base station of the wireless WAN and searching for access point connection information corresponding to the base station position information using the connection history when the message is received; ,
When the access point connection information can be retrieved from the connection history, the power to turn on the wireless LAN interface and turn on the wireless LAN interface after receiving the distribution information from the application server An access point connection means for controlling connection to an access point based on the access point connection information using a control means and the wireless LAN interface;
For a mobile terminal, wherein a computer functions as distribution information acquisition means for transmitting a distribution request to the application server via the access point using the wireless LAN interface and receiving the distribution information as a response to the distribution request. Program.

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