JP5246019B2 - Mobile phone - Google Patents

Description

  The present invention relates to a mobile phone that transmits an emergency call from a wireless IP telephone to an emergency center when making an emergency call from the wireless IP telephone.

  In recent years, portable terminals such as mobile phones and wireless IP (Internet Protocol) telephones have become widespread in ordinary households and are always carried by users, so that the number of cases where emergency calls are made via mobile phones has increased. ing. However, at present, an emergency call transmission service cannot be provided from a wireless IP telephone because a wireless IP telephone that performs communication using WLAN does not provide an emergency call transmission service. This is mainly because the IP address used to identify the mobile terminal by IP connection does not know the location of the mobile terminal, and therefore cannot know where to connect the emergency call.

  In view of this, a position acquisition system has been proposed that can specify the transmission position of a wireless LAN terminal when an emergency call is made from the wireless LAN terminal via the IP telephone network, such as police or fire (see Patent Document 1). . The position acquisition system determines whether the position information of the first wireless terminal is falsified by an acquisition unit that obtains the position information of the first wireless terminal from the transmission signal transmitted from the first wireless terminal. And determining the first information based on the position of the first access point that receives the transmission signal when determining that the position information of the first wireless terminal is the falsified information. The position information of the first wireless terminal is used.

JP 2006-191470 A

  A fixed wired IP telephone is configured to make a call using a general subscriber line only when an emergency call is made. In a portable terminal having both a communication function using a WLAN and a communication function using a mobile phone network, an emergency call is made. An emergency call connection destination can be determined from the location of the base station of the mobile phone network by making a mobile phone call when making a call.

  However, when a mobile terminal having only a communication function using WLAN as a communication function or a mobile terminal having a communication function using a mobile phone network is out of service area, these mobile terminals are currently Since an emergency call cannot be made, a method for determining a connection destination by managing the location of a WLAN access point (WLAN-AP) with a SIP server has been studied as a countermeasure.

  On the other hand, the location information of the mobile terminal is notified based on a request from the destination at the time of emergency call transmission. In the method of managing the location of the WLAN-AP by the above server, the accuracy of the location that can be notified is WLAN- It is an AP connection area unit, and detailed location information of the mobile terminal cannot be notified. In addition, in order for the server to manage the location information, a large amount of work such as renovation of the server equipment and registration of the WLAN-AP location occurs.

  In addition, even if the wireless IP phone is equipped with GPS, positioning by the A-GPS positioning method using the assist data stored in the location platform cannot be performed, and there is a problem that positioning takes time. .

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a mobile phone that can support making an emergency call while notifying location information from a wireless IP phone that communicates using WLAN. To do.

  In order to solve the above problems, a mobile phone according to the present invention is a mobile phone connected to an access point to which a wireless IP phone that communicates using WLAN is wirelessly connected. When a call is made to a destination, a connection is made to the predetermined destination, and information received from the predetermined destination is transmitted to the wireless IP phone via the access point and obtained from the wireless IP phone. Relay means for transmitting the information to the predetermined destination, and when the positioning is started from the predetermined destination based on the positioning request, the assist data for simplifying the positioning of the position is acquired and the acquired assist Position information transmitting means for transmitting data to the wireless IP telephone, receiving position information transmitted from the wireless IP telephone, and transmitting the position information; And said that there were pictures.

  According to the mobile phone according to the present invention, it is possible to support making an emergency call while notifying location information from a wireless IP phone that communicates using WLAN.

1 is a configuration diagram of a communication system to which a mobile phone according to the present invention is applied. The block diagram which shows the radio | wireless IP telephone which a communication system has. The block diagram which shows the mobile telephone which concerns on this invention. The figure which shows the flow of the emergency call transmission assistance process in the communication system with which the mobile telephone concerning this invention is applied. The flowchart which shows the procedure in which the mobile telephone which concerns on this invention performs an emergency call transmission assistance process.

  An embodiment of a mobile phone according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a configuration diagram showing a communication system 100 to which a cellular phone 5 according to the present invention is applied. In the communication system 100, a wireless IP (Internet Protocol) telephone 1 and a mobile phone 5 can communicate with each other.

  The communication system 100 includes a network 2 with which the wireless IP telephone 1 communicates. The network 2 is a network that communicates in a wide area by connecting LANs (Local Area Networks) or LANs and WANs (Wide Area Networks) such as ARPANET (Advanced Research Project Agency). The network 2 includes a plurality of access points 2 a that receive radio waves transmitted from the wireless IP telephone 1 and transmit radio waves to the wireless IP telephone 1. The wireless IP telephone 1 is connected to the network 2 via the neighboring access point 2a and communicates with other communication devices (for example, the fixed IP telephone 2b) via the network 2. Further, when the access point 2a receives a call from the wireless IP telephone 1 wirelessly connected to the network 2, the access point 2a determines whether the call is a normal call or an emergency call, and makes an emergency call call. If there is, connect this call to the emergency call destination.

  In the communication system 100, the network 2 is connected to a network 3 that is a public line network via a gateway 3a. The wireless IP telephone 1 communicates with another communication device (for example, a fixed telephone 3b) via the network 2 and the network 3.

  The communication system 100 includes a network 4 through which the mobile phone 5 communicates. The network 4 is, for example, a mobile phone network, and includes a plurality of base stations 4 a that receive radio waves transmitted from the mobile phone 5 and transmit radio waves to the mobile phone 5. The mobile phone 5 is wirelessly connected to the network 4 via the neighboring base station 4a by, for example, a W-CDMA (Wideband-Code Division Multiple Access) method.

  A location platform 7 is connected to the network 4. The location platform 7 stores information indicating a position and information (assist data) necessary for positioning at the position. The assist data includes information on satellites that can be used at that position, information on the Doppler frequency, and the like.

  First, communication control processing when an emergency call such as 110 or 119 is made from the mobile phone 5 in the communication system 100 will be described. When an emergency call such as 110 or 119 is made from the mobile phone 5, the network 4 sends an emergency call to an emergency call destination (police, fire department, etc.) in the area of the base station 4a to which the mobile phone 5 is connected. Connecting. At this time, the mobile phone 5 can autonomously notify the report destination of its own location, but if that is not done, the location information of the mobile phone 5 that has made an emergency call by an operation from the emergency destination The function to acquire is provided.

  When an operation for acquiring the location information of the mobile phone 5 from an emergency destination is performed, the location information acquisition request (positioning request) of the mobile phone 5 is a location platform in the mobile phone system to which the mobile phone 5 belongs. 7 is transmitted. When the location platform 7 receives the request for acquiring the position information, the location platform 7 distributes the request for acquiring the position information to the target mobile phone 5 (positioning activation).

  The mobile phone 5 that has received the request for acquiring the position information measures its own position based on the request, for example, using the MS-Based method of A-GPS (Assisted GPS). In the MS-Based method, the mobile phone 5 notifies the location platform 7 of information (cell information) of the base station to which the mobile phone 5 belongs, and the location platform 7 is necessary for GPS positioning based on the received cell information. Information (assist data) is notified to the mobile phone 5.

  The mobile phone 5 uses the assist data to receive radio waves from GPS satellites and calculate the position. According to this method, it becomes unnecessary to calculate the orbit of the GPS satellite and to receive information necessary for the GPS satellite from the GPS satellite, so that the positioning time can be shortened and the sensitivity can be improved. When the mobile phone 5 acquires its own location information by this method, the mobile phone 5 notifies the location platform 7 of the information, and the location platform 7 notifies the emergency transmission destination of the location information acquired from the mobile phone 5.

  If the mobile phone 5 fails to acquire the location information, the location platform 7 determines the approximate location of the mobile phone 5 from the information of the base station 4a to which the mobile phone 5 is connected and notifies the emergency call destination. The accuracy of the position information at this time is worse than the accuracy when the position can be measured by the mobile phone 5, but the rough position of the mobile phone 5 can be notified. That is, the accuracy when positioning with the mobile phone 5 is generally several tens of meters, but the accuracy of the position information determined from the information of the base station 4a is about several kilometers.

  FIG. 2 is a block diagram showing functions of the wireless IP telephone 1. As shown in FIG. 2, the wireless IP telephone 1 includes a main control unit 10, a power supply circuit unit 11, an operation input control unit 12, a display control unit 13, a voice control unit 14, a wireless IP communication control unit 15, and a GPS reception unit 16. And the storage unit 17 are connected to each other via a bus so as to communicate with each other.

  The main control unit 10 includes a CPU (Central Processing Unit), performs overall control of the wireless IP telephone 1, and performs communication control processing, which will be described later, and various other arithmetic processing and control processing. The power supply circuit unit 11 includes a power supply source such as a battery, switches the power on / off state based on a user operation, and supplies power to each unit from the power supply source when the power is on. The wireless IP telephone 1 is made operable.

  The operation input control unit 12 includes an operation key for inputting data when pressed by the user. When the operation key is detected, the operation input control unit 12 generates a signal indicating the operation, and this signal is used as the main control unit. 10 is transmitted. The main control unit 10 that has received the signal performs processing based on this signal.

  The display control unit 13 includes a display for displaying data, and includes a display interface for the display. Based on the control of the main control unit 10, the display control unit 13 displays a screen including a document, an image, and the like, Switch the ON / OFF state of.

  The sound control unit 14 includes a speaker that outputs sound and a microphone that collects sound. The sound control unit 14 generates an analog sound signal from the sound collected by the microphone based on the control of the main control unit 10. Is converted into a digital audio signal. Further, when acquiring the digital audio signal, the audio control unit 14 converts the digital audio signal into an analog audio signal based on the control of the main control unit 10 and outputs the analog audio signal as audio from the speaker.

  The wireless IP communication control unit 15 includes an antenna 15a. Based on the control of the main control unit 10, the radio IP communication control unit 15 performs a spectrum despreading process on the received signal received from the access point 2a of the network 2 via the antenna 15a. Restore. This data is transmitted to the audio control unit 14 and output from the speaker, transmitted to the display control unit 13 and displayed on the display, or recorded in the storage unit 17 according to an instruction from the main control unit 10. In addition, the wireless IP communication control unit 15 acquires voice data collected by the microphone, data input through the operation keys, and data stored in the storage unit 17 based on the control of the main control unit 10. These data are subjected to spread spectrum processing and transmitted to the access point via the antenna 15a.

  The GPS receiver 16 includes an antenna 16a for receiving radio waves broadcast from GPS satellites of a GPS (Global Positioning System) system that measures position information on the earth, and the radio waves received via the antenna 16a Based on this, GPS information indicating the position information of the wireless IP telephone 1 is generated and transmitted to the main control unit 10. Note that the GPS information acquisition method is not limited to the method in which the wireless IP telephone 1 generates GPS information, but the GPS server detects the position of the wireless IP telephone 1 to generate GPS information. The method of sending to

  When the main control unit 10 performs processing performed by the main control unit 10, a ROM (Read Only Memory), a hard disk, a non-volatile memory, a database, and the main control unit 10 store processing programs and data necessary for the processing. It is composed of a RAM (Random Access Memory) or the like that temporarily stores data used in the memory. Further, it is assumed that a processing program when the main control unit 10 performs a communication control process described later is stored in, for example, a ROM.

  FIG. 3 is a block diagram showing functions of the mobile phone 5. As shown in FIG. 3, the cellular phone 5 includes a main control unit 20, a power supply circuit unit 21, an operation input control unit 22, a display control unit 23, a voice control unit 24, a communication control unit 25, a GPS reception unit 26, and a storage. The units 27 are configured to be communicable with each other via a bus.

  The main control unit 20 includes a CPU (Central Processing Unit), performs overall control of the mobile phone 5, and performs communication control processing, which will be described later, and various other arithmetic processing and control processing. The power supply circuit unit 21 includes a power supply source such as a battery, switches the power on / off state based on a user operation, and supplies power to each unit from the power supply source when the power is on. The mobile phone 5 is made operable.

  The operation input control unit 22 includes operation keys for inputting data when pressed by the user, and includes an input interface for the operation keys. When the operation input control unit 22 detects pressing of the operation keys, the operation input control unit 22 generates a signal indicating the operations. Then, this signal is transmitted to the main controller 20. The main control unit 20 that has received the signal performs processing based on this signal.

  The display control unit 23 includes a display for displaying data, and includes a display interface for the display. Based on the control of the main control unit 20, the display control unit 23 displays a screen including a document, an image, and the like, Switch the ON / OFF state of.

  The sound control unit 24 includes a speaker that outputs sound and a microphone that collects sound, and generates an analog sound signal from the sound collected by the microphone based on the control of the main control unit 20. Is converted into a digital audio signal. Further, when acquiring the digital audio signal, the audio control unit 24 converts the digital audio signal into an analog audio signal based on the control of the main control unit 20 and outputs the analog audio signal as audio from the speaker.

  The communication control unit 25 includes an antenna 25a, and based on the control of the main control unit 20, the received signal received from the base station 4a of the network 4 via the antenna 25a is subjected to spectrum despreading processing to restore data. . This data is transmitted to the audio control unit 24 and output from the speaker, transmitted to the display control unit 23 and displayed on the display, or recorded in the storage unit 27 according to an instruction from the main control unit 20. Further, when the communication control unit 25 acquires the voice data collected by the microphone, the data input through the operation keys, or the data stored in the storage unit 27 based on the control of the main control unit 20, Spread spectrum processing is performed on the data, and the data is transmitted to the base station via the antenna 25a.

  The GPS receiving unit 26 includes an antenna 26a for receiving radio waves broadcast from GPS satellites of a GPS system that measures position information on the earth, and based on the radio waves received via the antenna 26a, a mobile phone GPS information indicating position information 5 is generated and transmitted to the main control unit 20. The GPS information acquisition method is not limited to the method in which the mobile phone 5 generates GPS information, but the GPS server detects the position of the mobile phone 5 to generate GPS information, and transmits the GPS information to the mobile phone 5. The method is fine.

  The storage unit 27 performs processing performed by the main control unit 20 when a processing program, data necessary for processing, a ROM (Read Only Memory), a hard disk, a nonvolatile memory, a database, and the main control unit 10 perform processing. It is composed of a RAM (Random Access Memory) or the like that temporarily stores data used in the memory. Further, it is assumed that a processing program when the main control unit 20 performs a communication control process described later is stored in, for example, a ROM.

  In the communication system 100, the wireless IP phone 1 makes an emergency call to an emergency destination using the emergency call function of the mobile phone 5 described above. FIG. 4 shows the location information of the wireless IP phone 1 using WLAN by using the emergency call function of the mobile phone 5 when an emergency call transmission is instructed from the wireless IP phone 1 in the communication system 100. It is a conceptual diagram which shows the communication control process which transmits to and implement | achieves an emergency call transmission.

  As shown in FIG. 4, in the communication system 100, a mobile phone 5 is communicably connected to an access point (WLAN-AP) 2a of the network 2. Thus, when an emergency call a is transmitted from the wireless IP telephone 1 connected to the access point 2a via the network 2, the wireless IP telephone 1 urgently sends an emergency call to the destination via the mobile phone 5. Call connected.

  The access point 2a monitors information transmitted when the connected wireless IP telephone 1 makes a call, and determines whether or not it is an emergency call call. If it is determined that the call is not an emergency call, the information transmitted by the wireless IP telephone 1 is relayed to the network 2 (IP network). On the other hand, in the case of emergency call transmission, the information transmitted by the wireless IP telephone 1 is controlled not to be relayed to the network 2 (IP network) but to be transmitted to the connected mobile telephone 5. In response to a request from the access point 2a, the mobile phone 5 makes a call to an emergency destination in the area of the base station to which the mobile terminal 5 is connected. After the mobile phone 5 and the emergency destination are connected, the access point 2a relays the received voice of the mobile phone 5 to the wireless IP phone 1, and relays the transmitted voice of the wireless IP phone 1 to the mobile phone 5. . As a result, a call between the wireless IP telephone 1 and the emergency call destination can be realized.

  The emergency call destination 4b can transmit a request for acquiring the position of the terminal that has made an emergency call in response to a predetermined operator operation after connecting to the terminal that has made an emergency call. When a location acquisition request (positioning request b) is transmitted from the emergency destination, this request is transmitted to the location platform 7 in the system to which the mobile phone 5 connected to the access point 2a belongs.

  When the location platform 7 receives the positioning request b, the location platform 7 uses the SMS notification function to deliver a request for acquiring location information for the target terminal. This SMS is transmitted to the mobile phone 5 that has made an emergency call via the PPG / SMSC 7a. A PPG (Push Proxy Gateway) device is a device that pushes message information and the like to a destination terminal. The SMSC (Short Message Service Center) is a device that transmits and receives a short message to and from a terminal.

  When the mobile phone 5 receives the SMS including the request for obtaining the position information from the PPG / SMSC 7a, the mobile phone 5 starts positioning in the A-GPS MS-Based method. That is, the mobile phone 5 transmits information (cell information) of the base station to which it belongs to the location platform 7. The location platform 7 extracts assist data necessary for positioning in the cell based on the received cell information, and transmits it to the mobile phone 5. Then, the cellular phone 5 notifies the received assist data to the wireless IP phone 1 that has made an emergency call via the access point 2a.

  The wireless IP telephone 1 that has made an emergency call receives radio waves from the satellite using the assist data, and calculates the position of the wireless IP telephone 1. Then, the wireless IP phone 1 transmits the calculated position information to the mobile phone 5 via the access point 2a.

  The mobile phone 5 that has received the position information calculated by the wireless IP phone 1 transmits this position information to the location platform 7. The location platform 7 notifies the emergency destination of the received location information, and the emergency destination can acquire the location information measured by the wireless IP telephone 1.

  As described above, since the mobile phone 5 connected to the access point 2a to which the wireless IP phone 1 is connected transmits assist data for positioning to the wireless IP phone 1, the wireless IP phone 1 The position of the terminal itself can be quickly determined using the assist data.

  When the mobile phone 5 acquires assist data from the location platform 7, the mobile phone 5 notifies the wireless IP phone 1 of the assist data and uses the GPS of the mobile phone 5 to determine the position of the mobile phone 5 using the assist data. May be performed. As described above, when positioning is performed by the mobile phone 5 and a normal positioning result is received from the wireless IP telephone 1, the positioning result received from the wireless IP telephone 1 is notified to the location platform 7 as its own positioning result, and the wireless IP When a normal positioning result cannot be received from the telephone set 1, the mobile phone 5 notifies the location platform 7 of the positional information of the terminal that has been positioned. As a result, the location information of the wireless IP telephone 1 is notified to the emergency call destination when the position can be determined by the wireless IP telephone 1, and even if the position cannot be determined by the wireless IP telephone 1, the wireless IP telephone 1 Can be notified of the position information of the mobile phone 5 existing near the mobile phone 5. Since the cellular phone 5 is connected to the access point 2a, the distance between the cellular phone 5 and the wireless IP phone 1 is equivalent to the connectable range of the access point 2a (several hundred meters). Therefore, when notifying the location platform of the position measured by the mobile phone 5 is less accurate than the accuracy (several tens of meters) when notifying the position measured by the wireless IP phone 1, The location information can be notified to the emergency call destination with higher accuracy than when the accuracy (several kilometers) of the location information calculated from the base station information is notified as the location of the wireless IP telephone 1.

  Further, when the wireless IP phone 1 fails in positioning and the mobile phone 5 fails in positioning, the mobile phone 5 uses the location information (for example, base station information of the base station 4a) registered in the mobile phone 5 in advance. And the location information of the access point 2a) is transmitted to the location platform 7. As described above, in the communication system 100, when the wireless IP phone 1 is in a place where positioning cannot be performed (for example, underground), the mobile phone 5 performs positioning and uses the position information.

  The processing procedure of the mobile phone 5 when the mobile phone 5 makes an emergency call to the emergency destination when the wireless IP phone 1 makes an emergency call in the communication system 100 is shown in the flowchart of FIG. This will be explained based on.

  Based on the control from the access point 2a, the mobile phone 5 makes an emergency call to the emergency call destination in the area of the base station to which the mobile terminal 5 is connected. After being connected to the emergency call destination, the mobile phone 5 transmits the received voice received from the emergency call destination to the access point 2a, and the access point 2a sends the transmission voice received from the wireless IP phone 1 to the emergency call destination. To do. Thereby, an emergency call function between the wireless IP telephone 1 and the emergency call destination is realized.

  Thereafter, when the mobile phone 5 receives a request for acquiring location information from the location platform 7 via the PPG / SMSC 7a (Yes in S101), the mobile phone 5 uses the location platform information (cell information) of the base station to which the mobile phone 5 belongs. 7 is transmitted (S105). As a response, the mobile phone 5 determines whether or not the assist data from the location platform 7 has been received (S107). When the assist data is received (Yes in S107), the mobile phone 5 transmits the assist data via the access point 2a to the wireless IP phone 1 that has made an emergency call (S109). In addition, the mobile phone 5 transmits assist data to the wireless IP phone 1 and performs positioning of the mobile phone 5 using the GPS receiver 26.

  The wireless IP telephone 1 that has made an emergency call transmission uses the received assist data to receive radio waves from GPS satellites, calculate the position, and generate position information. The calculated positioning result (position information) is transmitted to the mobile phone 5 via the access point 2a.

  The mobile phone 5 connected to the access point 2a determines whether or not appropriate location information has been received from the wireless IP phone 1 (S111). When the appropriate position information is received (Yes in S111), the mobile phone 5 transmits the positioning result (position information) acquired from the wireless IP phone 1 to the location platform 7 as the positioning result (S113). Then, the location platform 7 transmits the position information received from the wireless IP telephone 1 to the emergency destination. On the other hand, when appropriate position information has not been received (that is, when positioning NG information has been sent) (No in S111), for example, when positioning NG information has been received or positioning information has not been received, The mobile phone 5 transmits the position information measured by the GPS of the mobile phone 5 using the assist data received from the location platform in step S107 to the location platform 7 as a positioning result (S115).

  In this way, in the communication system 100, when there is an emergency call transmission from the wireless IP telephone 1 that performs communication using the WLAN, the mobile phone 5 mediates this transmission and transmits it to the emergency destination. Then, when there is a request for acquiring location information from the emergency call destination, the mobile phone 5 acquires assist data from the location platform 7, and the wireless IP phone 1 performs positioning of the location information using this assist data. Therefore, accurate position information of the wireless IP telephone 1 can be quickly measured.

  Further, when the wireless IP telephone 1 is in a position incapable of positioning, the mobile phone 5 connected to the access point 2a transmits the position information measured by itself to the emergency destination. The positioning accuracy at this time is equivalent to the connectable range of the access point 2a (several hundred meters), which is worse than the accuracy (several tens of meters) when positioning with the wireless IP telephone 1, but the cellular phone system Thus, it is possible to acquire position information with higher accuracy than the accuracy (several kilometers) of the position information calculated from the base station information.

  According to the mobile phone 5 of the present invention, it is possible to support making an emergency call while notifying the location information from the wireless IP phone 1 that communicates using the WLAN, and the wireless IP phone 1 does not perform GPS positioning. Even in a possible location, it is possible to notify the emergency call destination of rough location information of the wireless IP telephone 1.

  Furthermore, in the embodiment of the present invention, the steps of the flowchart show an example of processing performed in time series in the order described, but parallel or individual execution is not necessarily performed in time series. The processing to be performed is also included.

  DESCRIPTION OF SYMBOLS 100 ... Communication system, 1 ... Wireless IP telephone, 2, 3, 4 ... Network, 2a ... Access point, 2b ... Fixed IP telephone, 3a ... Gateway, 4a ... Base station, 4b ... Fixed telephone, 5 ... Mobile phone, 7 ... location platform, 10, 20 ... main control unit, 11, 21 ... power supply circuit unit, 12, 22 ... operation input control unit, 13, 23 ... display control unit, 14, 24 ... voice control unit, 15 ... wireless IP communication Control unit, 25 ... communication control unit, 15a, 25a ... antenna, 16, 26 ... GPS reception unit, 16a, 26a ... antenna, 17, 27 ... storage unit.

Claims (4)

A mobile phone connected to an access point to which a wireless IP phone that communicates using WLAN is wirelessly connected,
When a call operation is performed from the wireless IP phone to a predetermined destination, the predetermined connection destination is connected, and information received from the predetermined destination is transmitted to the wireless IP phone via the access point. Relay means for transmitting information acquired from the wireless IP telephone to the predetermined destination;
When positioning is started based on a positioning request from the predetermined destination, assist data for simplifying positioning of the position is acquired, the acquired assist data is transmitted to the wireless IP phone, and the wireless IP phone A mobile phone comprising position information transmitting means for receiving transmitted position information and transmitting the position information. Comprising first positioning means for positioning the position of the mobile phone;
2. The mobile phone according to claim 1, wherein the location information transmitting means transmits the location information measured by the first positioning means when appropriate location information is not received from the wireless IP phone. . An acquisition means for acquiring base station information indicating a base station in the vicinity of the mobile phone;
The first transmitting unit transmits base station information acquired by the acquiring unit when appropriate position information is not received from the wireless IP telephone and the first positioning unit fails in positioning. The mobile phone according to claim 2. A mobile phone connected to an access point to which a wireless IP phone that communicates using WLAN is wirelessly connected,
When a call operation is performed from the wireless IP phone to the emergency destination, the emergency destination is connected, information received from the emergency destination is transmitted to the wireless IP phone via the access point, and the wireless IP Relay means for transmitting information acquired from the telephone to the emergency destination;
When positioning is started by a location platform based on a positioning request from the emergency destination, cell data of the terminal is transmitted to the location platform to acquire assist data for simplifying positioning and the acquired assist A cellular phone comprising position information transmitting means for transmitting data to the wireless IP telephone, receiving positional information transmitted from the wireless IP telephone, and transmitting the positional information to the location platform.

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