JP4662870B2 - Wireless communication terminal and program - Google Patents

Description

  The present invention relates to a radio communication terminal and a program that are set to an operation mode corresponding to a base station of a connection source.

  As shown in FIG. 9, a wireless communication terminal having a GPS reception function implements a positioning function that specifies the position of its own terminal using a GPS signal or a base station signal transmitted from a GPS satellite, Time management is performed based on time information obtained from signals. As this type of technology, for example, in Patent Document 1, a GPS time (reference time) acquired from a GPS signal is compared with a system time of a base station, and if the system time does not match the GPS time, the base station A wireless communication terminal that prohibits the location using the Internet is disclosed.

JP 2003-114269 A

  By the way, in the wireless communication terminal disclosed in Patent Document 1, if the system time of the base station does not coincide with the GPS time, only the position specification using the base station is prohibited. Connected to a base station (first base station) installed on the ground that can receive GPS signals, and connected to a base station (second base station) installed in places where GPS signals cannot be received such as underground shopping centers It is not possible to automatically change methods such as warning notification, position specification, or time acquisition. That is, there is a problem that the operation mode corresponding to the base station of the connection source cannot be set.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wireless communication terminal and a program that can be set to an operation mode corresponding to a connection source base station.

  In order to achieve the above object, according to the first aspect of the present invention, reference time generating means for generating reference time information based on a timing clock obtained by GPS reception, and time acquisition for acquiring time information from a connecting base station The base station of the connection source is installed in a place where the GPS signal can be received according to the time difference between the reference time information generated by the reference time generation means and the time information acquired by the time acquisition means. Determining means for determining which one of the first base station or the second base station installed at a place where GPS signals cannot be received, and the determining base means that the connecting base station is the second underground station And an operation mode setting means for setting an operation mode corresponding to the second underground station when the determination is made.

  In the invention according to claim 2, which is dependent on claim 1, the operation mode setting means is unable to perform handoff in which base stations cannot be switched in response to occurrence of a quality degradation event due to radio wave quality degradation during a call. This is characterized by warning the user of this fact.

  In the invention according to claim 3 subordinate to claim 1, the operation mode setting means informs the user that handoff is not possible because the base station cannot be switched in response to the occurrence of an outgoing event or incoming event. A warning is notified.

  In the invention according to claim 4, which is dependent on claim 1, the operation mode setting means does not perform GPS positioning when an event for instructing position generation occurs, and obtains position information from a connection source base station. Is notified to the user.

  In the invention according to claim 5 subordinate to claim 1, the operation mode setting means does not acquire time information of a base station by the time acquisition means when an event instructing time acquisition occurs, The reference time generation means maintains the time stepped from the reference time information generated based on the timing clock obtained by GPS reception.

  In the invention according to claim 6 subordinate to claim 1, when the determination means determines that the base station of the connection source is the first base station installed at a place where the GPS signal can be received, An attribute determining means for determining whether or not the connection source base station has the attribute of the first base station is further provided.

  In the invention according to claim 7, which is dependent on claim 6, the attribute determination means is a base station in which the connection source base station is capable of handoff to switch the connection source to an adjacent base station, and a connection is established. It is characterized by determining whether or not the base station is capable of selecting a frequency to be selected from a plurality of frequencies.

  In the invention according to claim 8, in the computer, a reference time generation function for generating reference time information based on a timing clock obtained by GPS reception, a time acquisition function for acquiring time information from a connecting base station, In accordance with the time difference between the reference time information generated by the reference time generation function and the time information acquired by the time acquisition function, the connection source base station is installed in a place where the GPS signal can be received. A determination function for determining which is a base station or a second base station installed at a place where GPS signals cannot be received, and the determination base function determines that the connection source base station is a second base station A program for realizing an operation mode setting function for setting an operation mode corresponding to the second base station.

  According to the first and eighth aspects of the invention, according to the time difference between the reference time information generated based on the timing clock obtained by the GPS reception and the time information acquired from the base station of the connection source, It is determined whether the base station is a first base station installed at a location where GPS signals can be received or a second base station installed at a location where GPS signals cannot be received, and the base station of the connection source If the station is determined to be the second base station, the operation mode corresponding to the second base station is set. Therefore, when connecting to a base station (first base station) installed on the ground that can receive GPS signals, and to a base station (second base station) installed in a place where GPS signals cannot be received such as an underground shopping center Since the operation mode is automatically changed depending on the connection, it is possible to set the operation mode corresponding to the connection source base station.

  According to the second aspect of the present invention, in response to the occurrence of a quality degradation event due to radio wave quality degradation during a call, a warning notification is given to the user that handoff is not possible because the base station cannot be switched. Therefore, when connected to a base station (second base station) installed in a place where GPS signals cannot be received, such as an underground shopping center, a warning is given that handoff is not possible, and the connected base station during a call Can be cautioned not to move outside the call area.

  According to the third aspect of the present invention, in response to the occurrence of a transmission event or an incoming event, a warning notification is given to the user that handoff is not possible because the base station cannot be switched. Therefore, when connecting to a base station (second base station) installed in a place where GPS signals cannot be received such as an underground shopping center, a warning is given that handoff is not possible, and this connection is made after outgoing or incoming Care can be taken not to move outside the base station call area.

  According to the fourth aspect of the present invention, when an event for instructing location occurs, GPS positioning is not performed, and the user is notified of location information acquired from the connection-source base station. Therefore, the user can know the position even in a place where GPS signals cannot be received such as an underground shopping center.

  According to the fifth aspect of the present invention, when an event for instructing time acquisition occurs, the time information of the base station is not acquired by the time acquisition unit, and the timing clock obtained by the reference time generation unit by GPS reception is obtained. The time incremented from the reference time information generated based on the above is maintained as it is. Therefore, it is possible to prevent the time of the wireless communication terminal from being shifted by acquiring an inaccurate time from a base station (second base station) installed in a place where a GPS signal cannot be received such as an underground shopping center.

  According to the sixth aspect of the present invention, when the connection source base station is determined to be the first base station, it is determined whether or not the base station has the attribute of the first base station. To do. Therefore, it is possible to improve the accuracy of determination as to whether or not the connection source base station is a base station (first base station) installed on the ground that can receive GPS signals.

  According to the seventh aspect of the present invention, the base station that is the connection source is a base station that can perform handoff to switch the connection source to the adjacent base station, and the base frequency from which the connection frequency can be selected from a plurality of frequencies. It is determined whether it is a station. Therefore, it is possible to improve the accuracy of determination as to whether or not the connection source base station is a base station (first base station) installed on the ground that can receive GPS signals.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
A. Configuration FIG. 1 is a block diagram showing a configuration of a wireless communication terminal 100 according to an embodiment of the present invention. In this figure, a wireless communication terminal 100 includes a communication processing unit 10 having an antenna ANT1, a control unit 11, a ROM 12, a RAM 13, an operation unit 14, a microphone 15, a speaker 16, a display unit 17, a vibrator 18, and a GPS reception having an antenna ANT2. The unit 20 is provided.

  The communication processing unit 10 demodulates the reception signal input via the antenna ANT 1 to generate audio data, and outputs the generated audio data to the control unit 11. On the other hand, the transmission signal obtained by modulating the audio data supplied from the control unit 11 is amplified at a high frequency and transmitted from the antenna ANT1.

The control unit 11 is a CPU (Central
Processing Unit) and DSP (Digital Signal) for baseband signal processing
The processor 12 is configured to read out various processing programs stored in the ROM 12 and perform various calculations, and controls the operation of each part of the terminal in accordance with a switch operation of the operation unit 14 described later.

  Specifically, the voice data during a call output from the communication processing unit 10 is decompressed, further D / A converted into an analog voice signal to be generated from the speaker 16, and the analog voice output from the microphone 15. The signal is subjected to A / D conversion, and further, audio data obtained by compressing the A / D converted data is supplied to the communication processing unit 10. Further, the characteristic operation of the control unit 11 according to the gist of the present invention, that is, the operation for setting the operation mode corresponding to the base station of the connection source (state 1 processing, state 2 processing, state 3 processing, and reception state confirmation described later) The processing will be described in detail later.

  The ROM 12 includes a program area and a data area. Various processing programs executed by the control unit 11 are stored in the program area of the ROM 12. The various processing programs include a state 1 process, a state 2 process, a state 3 process, and a reception state confirmation process which will be described later. In the data area of the ROM 12, various screen data forming a standby screen, for example, is stored in addition to control data referred to by a predetermined program.

  The RAM 13 includes a data area for storing, for example, outgoing / incoming histories and transmitted / received mails, in addition to a work area for temporarily storing flags and register data used for various processes executed by the control unit 11. The operation unit 14 has various switches such as a power switch and an off-hook / on-hook switch operated at the start / end of a call, and various processes are executed according to the operation of these switches. The display unit 17 includes a color liquid crystal panel and a display driver, and displays various screens such as a standby screen under the control of the control unit 11. The GPS receiving unit 20 receives a GPS signal via the antenna ANT2 in accordance with an instruction from the control unit 11, and extracts and stores the position information and time information of the terminal itself from the received GPS signal.

B. Operation Next, the operation of the wireless communication terminal 100 configured as described above will be described with reference to FIGS. The wireless communication terminal 100 defines three states (states 1 to 3) as shown in the state transition diagram illustrated in FIG. 2 in order to set the operation mode corresponding to the base station of the connection source. Here, the state 1 is a base station installed on the ground where the connecting base station can receive GPS signals (hereinafter, the first base station is referred to as a ground station) or a place where GPS signals cannot be received such as an underground mall. This represents a “receiving station unknown state” in which it is unknown which of the installed base stations (hereinafter, this second base station is referred to as an underground station). State 2 represents a “ground station reception state” in which the base station of the connection source is the ground station. State 3 represents an “underground station reception state” in which the base station of the connection source is the underground station. These states 1 to 3 are changed according to a state 1 process, a state 2 process, and a state 3 process executed by the control unit 11 of the wireless communication terminal 100. Hereinafter, each operation of the state 1 process, the state 2 process, and the state 3 process will be described.

(1) Operation of State 1 Process Next, the operation of the state 1 process will be described with reference to FIGS. In addition to the case where the power switch of the operation unit 14 of the wireless communication terminal 100 is pressed and the wireless communication terminal 100 is activated and set to the standby state, the state 2 is changed to the state 1 or the state 3 as shown in FIG. When transitioning from state 1 to state 1, the control unit 11 executes state 1 processing, proceeds to step SA1, and instructs the GPS receiving unit 20 to start positioning. Thereby, the GPS receiving part 20 acquires a timing clock from the GPS signal, when a GPS signal is received. Next, in step SA2, the timing clock acquired by the GPS receiving unit 20 is stored in the work area of the RAM 13, and this is synchronized with a timer clock generated inside the control unit 11 and timed and stepped, thereby making reference time information. Is generated.

  Subsequently, in step SA3, a base station signal including time information is received from the base station whose location is registered (hereinafter referred to as a connection source base station). In step SA4, it is determined whether or not the time difference between the reference time information generated based on the GPS signal and the time information included in the base station signal is greater than or equal to a predetermined time (GPS synchronization deviation). If the time difference between the two time information is equal to or greater than the predetermined time, the determination result is “YES”, the process proceeds to step SA8, and the “receiving station unknown state” in which it is unknown whether the connection source base station is a ground station or an underground station. As such, state 1 is maintained.

  On the other hand, if the time difference between the time information included in the base station signal and the reference time information is less than the predetermined time, the determination result in Step SA4 is “NO”, and the process proceeds to Step SA5. In steps SA5 to SA6, it is determined whether or not the connection source base station has attributes of ground stations operated using a plurality of adjacent base station information and a plurality of frequencies. If the connection source base station has the attribute of the ground station, the determination results in steps SA5 to SA6 are all “YES”, and the process proceeds to step SB7, where the ground station reception state is determined and the state 2 is set. maintain. On the other hand, if the connection source base station does not have the attribute of the ground station, the determination result of any one of steps SA5 to SA6 becomes “NO”, and the process proceeds to step SA8, where the receiving station unknown state is set as the state 1 Transition to.

(2) Operation of State 2 Process Next, the operation of the state 2 process will be described with reference to FIG. 2, FIG. 4, and FIG. As shown in FIG. 2, when the state 1 changes to the state 2 or when the state 3 changes to the state 2, the control unit 11 executes the state 2 process and proceeds to step SB 1 shown in FIG. 4. Then, it is determined whether or not the base station signal is continuously received. In the following, the description will be divided into an operation when the base station signal cannot be continuously received and an operation when the base station signal is continuously received.

<When the base station signal cannot be continuously received>
In this case, the determination result in step SB1 is “NO”, and the process proceeds to step SB2. In Steps SB2 to SB3, it is determined whether or not the reception of the base station signal has succeeded again during a certain period of time after the base station signal cannot be received. If the base station signal cannot be received even after a certain period of time has passed since the base station signal could not be received, the determination result in step SB2 is “YES”, the process proceeds to step SB8, and the receiving station unknown state Transitions to state 1 as if it were assumed.

  On the other hand, if the base station signal is successfully received again after a certain period of time elapses after the base station signal cannot be received, the determination result in step SB3 is “YES”, and the process proceeds to step SB4. In step SB4, it is determined whether or not the time difference between the reference time information measured in the work area of the RAM 13 and the time information included in the base station signal is greater than or equal to a predetermined time. If the time difference between the time information included in the base station signal and the reference time information is greater than or equal to a predetermined time, the determination result here is “YES”, the process proceeds to step SB8, and the state is changed to state 1 as the receiving station unknown state.

  On the other hand, if the time difference between the time information included in the base station signal and the reference time information is less than the predetermined time, the determination result in Step SB4 is “NO”, and the flow proceeds to Step SB5. In steps SB5 to SB6, as described above, it is determined whether or not the connection source base station has the attribute of the ground station. If the attributes of the ground station are provided, the determination results in steps SB5 to SB6 are all “YES”, the process proceeds to step SB7, the ground station reception state is determined, and the state 2 is maintained. On the other hand, if the base station of the connection source does not have the attribute of the ground station, the determination result of any of steps SB5 to SB6 becomes “NO”, and the process proceeds to step SB8, where it is assumed that the receiving station is unknown. Transition to state 1.

<When continuously receiving base station signals>
In this case, the determination result in step SB1 is “YES”, the process proceeds to step SB9 shown in FIG. 5, and it is determined whether or not the receiving base station (connection source base station) has been changed. If it is not changed, the determination result is “NO”, and the state 2 is maintained after the reception state confirmation process (which will be performed later) is executed via step SB18. On the other hand, when the base station of the connection source is changed, the determination result becomes “YES”, and the process proceeds to Step SB10. In step SB10, it is determined whether or not the time difference between the reference time information measured in the work area of the RAM 13 and the time information included in the base station signal is equal to or greater than a predetermined time. If the time difference between the two pieces of time information is less than the predetermined time, the determination result is “NO”, and the flow proceeds to Step SB11.

  In steps SB11 to SB12, it is determined whether or not the connection source base station has the attribute of the ground station. If the attribute of the ground station is provided, the determination results in steps SB11 to SB12 are “YES”, the process proceeds to step SB13, and the state 2 is maintained as the ground station reception state. On the other hand, if the connection source base station does not have the attribute of the ground station, the determination result of any one of steps SB11 to SB12 becomes “NO”, and the process proceeds to step SB14, where the receiving station unknown state is set to the state 1 Transition to.

  On the other hand, if the time difference between the time information included in the base station signal and the reference time information is equal to or greater than the predetermined time, the determination result in Step SB10 is “YES”, and the process proceeds to Step SB15. In steps SB15 to SB16, it is determined whether or not the connection source base station has the attribute of the ground station. If the base station of the connection source has the attribute of the ground station, the determination result of any of steps SB11 to SB12 becomes “YES”, the process proceeds to step SB14, and the state 1 is considered as the receiving station unknown state. Transition to. On the other hand, if the base station of the connection source does not have the attribute of the ground station, each determination result in steps SB15 to SB16 becomes “NO”, and the process proceeds to step SB17 to determine the reception status of the underground station. Transition to 3.

(3) Operation of State 3 Process Next, the operation of the state 3 process will be described with reference to FIGS. 2 and 6. As shown in FIG. 2, when transitioning from state 2 to state 3, the control unit 11 executes state 3 processing and proceeds to step SC1 shown in FIG. 6 to determine whether or not the receiving base station has been changed. . If the receiving base station has not been changed, the determination result is “NO”, and after executing reception state confirmation processing (described later) via step SC2, the process proceeds to step SC7 to maintain state 3 as the underground station reception state. To do.

  On the other hand, when the receiving base station is changed, the determination result in step SC1 is “YES”, and the process proceeds to step SC3. In step SC3, it is determined whether or not a fixed time has elapsed since the receiving base station was changed. If the predetermined time has elapsed, the determination result is “YES”, the process proceeds to step SC8, and the state transitions to state 1 as the receiving station unknown state.

  On the other hand, if the fixed time has not elapsed since the reception base station was changed, the determination result in step SC3 is “NO”, and the flow proceeds to step SC4. In step SC4, it is determined whether or not the time difference between the reference time information measured in the work area of the RAM 13 and the time information included in the base station signal is equal to or greater than a predetermined time. If the time difference between the time information included in the base station signal and the reference time information is greater than or equal to a predetermined time, the determination result is “YES”, and the flow proceeds to step SC5.

  In steps SC5 to SC6, it is determined whether or not the base station has the attribute of the ground station. If the attribute of the ground station is provided, the determination result of any one of steps SC5 to SC6 is “YES”, the process proceeds to step SC8, and transitions to state 1 assuming that the receiving station is unknown. On the other hand, if the base station does not have the attribute of the ground station, each determination result in steps SC5 to SC6 is “NO”, and the process proceeds to step SC7 to maintain the state 3 as the underground station reception state.

  If the time information included in the base station signal matches the reference time information, the determination result in step SC4 is “NO”, and the flow proceeds to step SC9. In steps SC9 to SC10, it is determined whether or not the base station has the attribute of the ground station. If the attribute of the ground station is provided, the determination results of steps SC9 to SC10 are “YES”, the process proceeds to step SC11, and the state transitions to state 2 as the ground station reception state. On the other hand, if the base station does not have the attribute of the ground station, the determination result of any one of steps SC9 to SC10 is “NO”, and the process proceeds to step SC8 to determine that the receiving station is unknown and shift to state 1. To do.

(4) Operation of Reception Status Confirmation Processing Next, the operation of the reception status confirmation processing will be described with reference to FIGS. When this process is executed via step SC2 (see FIG. 6) of the state 3 process described above, control unit 11 advances the process to step SD1 shown in FIG. In steps SD1 to SD4, “presence / absence of quality degradation event”, “presence / absence of outgoing / incoming event”, “presence / absence of location information acquisition event” and “presence / absence of time information acquisition event” are determined. If there is no corresponding event, the determination results in steps SD1 to SD4 are all “NO”, and the process 3 is finished without performing anything and the above-described state 3 is maintained. Execute the process. Hereinafter, the processing operation corresponding to each event will be described.

<When a quality degradation event occurs>
If the radio wave quality deteriorates during a call and a quality deterioration event occurs, the determination result in step SD1 is “YES”, and the flow proceeds to step SD8 shown in FIG. In step SD8, it is determined whether or not it is in the underground station reception state. If it is not in the underground station reception state, the determination result is “NO”, and this processing is finished. If it is the underground station reception state, the determination result is “YES”, and the process proceeds to Step SD9. In step SD9, the presence / absence of adjacent base station information is determined. If there is adjacent base station information, the determination result is “YES”, and the present process ends.

  On the other hand, if there is no adjacent base station information, the determination result is “NO”, and the process proceeds to step SD10. In steps SD10 to SD12, in order to warn that a voice call cannot be handed off because it is a call through an underground station without adjacent base station information, for example, “It is highly possible that the call will be cut off when moving.” A warning message is displayed on the display unit 17 and a warning sound and a warning vibration are generated using the speaker 16 and the vibrator 18.

<When an outgoing / incoming event occurs>
When a transmission event or an incoming event occurs, the determination result in step SD2 shown in FIG. 7 is “YES”, and the process proceeds to step SD13 shown in FIG. 8 to determine whether or not it is in the underground station reception state. If it is not in the underground station reception state, the determination result is “NO”, and this process is completed. If it is in the underground station reception state, the determination result is “YES”, and the process proceeds to step SD14. In step SD14, the presence / absence of adjacent base station information is determined. If there is adjacent base station information, the determination result is “YES”, and this process ends. If there is no adjacent base station information, the determination result is “NO”, and the process proceeds to step SD15. In step SD15, for example, “It is highly possible to hang up when moving” in order to warn that voice call handoff cannot be performed because it is outgoing / incoming via an underground station without adjacent base station information. A warning message is displayed on the display unit 17 on the screen.

<When a location information acquisition event occurs>
When the location information acquisition event occurs, the determination result in step SD3 shown in FIG. 7 is “YES”, and the process proceeds to step SD16 shown in FIG. 8 to determine whether or not the underground station reception state is set. If it is in the underground station reception state, the determination result is “YES”, the process proceeds to step SD17, the position information of the base station is notified to the user as the positioning result of the own terminal, and this process is finished. That is, in the underground station reception state, the position information of the base station is notified to the user without activating the GPS receiving unit 20. On the other hand, if it is not in the underground station reception state, the determination result in step SD16 is “NO”, and the process proceeds to step SD18 to execute GPS positioning processing for activating the GPS receiving unit 20 and specifying the position of the own terminal. This process is finished.

<When a time information acquisition event occurs>
When the time information acquisition event occurs, the determination result in step SD4 shown in FIG. 7 is “YES”, the process proceeds to step SD5, and it is determined whether or not it is in the underground station reception state. If it is in the underground station reception state, the determination result is “YES”, the process proceeds to step SD6, the time display based on the reference time information that is timed in the work area of the RAM 13 is maintained, and the present process is terminated. On the other hand, if it is not in the underground station reception state, the determination result in step SD5 is “NO”, and the process proceeds to step SD7, where the GPS receiving unit 20 is activated and the reference time information obtained from the GPS signal received thereby is added. The time display is updated to complete the process.

  As described above, in the present embodiment, the connection source base station is connected to the ground station (state) according to the time difference between the reference time information obtained by receiving the GPS signal and the time information obtained from the connection source base station. 2) Determine whether it is an underground station (state 3). If the connecting base station is an underground station, a voice call handoff cannot be performed because the call is made through the underground station in response to an outgoing / incoming event or a quality deterioration event due to radio wave quality deterioration during a call. This is notified to the user. When a location information acquisition event occurs, the location information of the base station is notified to the user as a positioning result without activating the GPS receiver 20. Further, when the time information acquisition event occurs, the time display based on the reference time information that is timed and advanced in the work area of the RAM 13 is maintained without starting the GPS receiving unit 20. Thereby, it becomes possible to set to the operation mode corresponding to the base station of the connection source.

  Note that the second base station installed in a place where GPS signals cannot be received may be a base station installed in a place where GPS signals cannot be received such as underground shopping malls, in buildings on the ground or in the sea, or in vehicles. A base station installed in a place where a GPS signal cannot be received may be used regardless of the place.

It is a block diagram which shows the structure of the radio | wireless communication terminal 100 by one Embodiment. 6 is a transition diagram showing state transition of the wireless communication terminal 100. FIG. It is a flowchart which shows operation | movement of a state 1 process. It is a flowchart which shows the operation | movement of a state 2 process. It is a flowchart which shows the operation | movement of a state 2 process. It is a flowchart which shows the operation | movement of a state 3 process. It is a flowchart which shows the operation | movement of a reception status confirmation process. It is a flowchart which shows the operation | movement of a reception status confirmation process. It is a figure for demonstrating background art.

Explanation of symbols

10 Communication processing unit 11 Control unit 12 ROM
13 RAM
DESCRIPTION OF SYMBOLS 14 Operation part 15 Microphone 16 Speaker 17 Display part 18 Vibrator 20 GPS receiving part 100 Wireless communication terminal

Claims (8)

Reference time generating means for generating reference time information based on a timing clock obtained by GPS reception;
Time acquisition means for acquiring time information from the connecting base station;
A first base installed at a location where the base station of the connection source can receive a GPS signal according to the time difference between the reference time information generated by the reference time generation means and the time information acquired by the time acquisition means Determining means for determining whether the station or the second base station installed in a place where GPS signals cannot be received;
Wireless communication, comprising: an operation mode setting unit configured to set an operation mode corresponding to the second base station when the determination unit determines that the base station of the connection source is the second base station. Terminal. 2. The operation mode setting means warns the user that handoff is impossible and the base station cannot be switched in response to the occurrence of a quality degradation event due to radio wave quality degradation during a call. The wireless communication terminal described. 2. The wireless communication terminal according to claim 1, wherein the operation mode setting means warns the user that handoff is impossible and the base station cannot be switched in response to the occurrence of an outgoing event or an incoming event. . 2. The operation mode setting unit according to claim 1, wherein, when an event for instructing position generation occurs, the position information acquired from the base station of the connection source is notified to the user without performing GPS positioning. Wireless communication terminal. The operation mode setting means does not acquire time information of the base station by the time acquisition means when an event instructing time acquisition occurs, and based on the timing clock obtained by the reference time generation means by GPS reception. 2. The wireless communication terminal according to claim 1, wherein the time stepped from the generated reference time information is maintained as it is. When the determination unit determines that the connection source base station is the first base station installed in a place where the GPS signal can be received, the connection source base station has the attribute of the first base station. The wireless communication terminal according to claim 1, further comprising attribute determination means for determining whether or not the communication is performed.   Whether the attribute determination means is a base station capable of handoff for switching the connection source to an adjacent base station, and a base station capable of selecting a connection frequency from a plurality of frequencies. The wireless communication terminal according to claim 6, wherein it is determined whether or not. On the computer,
A reference time generation function for generating reference time information based on a timing clock obtained by GPS reception;
A time acquisition function for acquiring time information from the base station of the connection source,
The connection source base station is installed at a location where the GPS signal can be received according to the time difference between the reference time information generated by the reference time generation function and the time information acquired by the time acquisition function. A determination function for determining which of the base station or the second base station installed in a place where GPS signals cannot be received,
An operation mode setting function for setting an operation mode corresponding to the second base station when the connection source base station is determined to be the second base station by the determination function.

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