JP5508925B2 - Mobile terminal device - Google Patents

Description

  The present invention relates to a mobile terminal device, and more particularly to a mobile terminal device equipped with a GPS positioning function unit that saves power.

In recent years, for example, a technique for mounting a positioning function unit in a mobile terminal device represented by a mobile phone is becoming widespread.
In the positioning function unit in the mobile terminal device as described above, a technique of selectively applying different positioning methods depending on the situation is also employed.
As a positioning method currently applied to mobile terminal devices, positioning is performed using navigation information (Almanac, Ephemeris, etc.) held by the network side, GPS time, and assist information including the approximate position information of the mobile terminal device. There are A-GPS positioning for performing GPS and autonomous GPS positioning for receiving positioning information from a GPS satellite without using assist information as described above and performing all positioning calculations on the mobile terminal device side.

  A-GPS positioning is a network-assisted positioning that performs positioning using assist information from the network side. For this purpose, the final positioning calculation processing is performed by a positioning server on the network side. A method called UE-Assisted (or MS-Assisted) that supplies the positioning performance processing result from the network side to the mobile terminal device side, and GPS positioning on the mobile terminal device side using assist information obtained from the network side There is a method called UE-Based (or MS-Based) for performing arithmetic processing.

And by switching and executing a plurality of positioning methods as described above, specific performance is improved, for example, by reducing communication costs or enabling positioning under various environments. Various technical proposals have already been made.
For example, in a network-assisted positioning system, the mobile terminal device needs to acquire assist information via the network every time positioning is performed. This acquisition increases traffic and reduces communication costs. A technique focusing on the problem of causing an increase has been proposed (see, for example, Patent Document 1).

In Patent Document 1, it is considered that an important issue is how to reduce the communication frequency for obtaining assist information in order to reduce the communication cost. And it has been proposed to reduce the communication cost of the network-assisted GPS terminal by reducing the frequency of communication with the network as much as possible for obtaining the approximate position state.
That is, the in-zone cell information related to the approximate position of the own device received by the communication unit in the first GPS positioning is stored in the storage unit, and the in-zone stored in this storage unit in the second and subsequent GPS positionings Only when the cell information is different from the previous GPS positioning, the approximate location information is acquired from the network. Then, the obtained approximate location information is used for GPS positioning calculation and held in the holding unit, and the in-zone cell information stored in the storage unit in the second and subsequent GPS positioning is the same as the previous GPS positioning. In this case, the approximate location information held in the holding unit is used for GPS positioning calculation to reduce the frequency of obtaining approximate location information, and as a result, the communication frequency with the network is reduced to reduce the communication cost. is there.

Also, multiple positioning methods can be selectively executed, and even if positioning by one method fails, positioning by another positioning method can be selected, and positioning can be performed by a method that is possible according to conditions. There has been proposed a technique that can avoid such a situation as impossible (see, for example, Patent Document 2).
In the mobile terminal device of Patent Document 2, when the network-assisted positioning fails, the location information is used when the location information of the cell where the mobile terminal device is located is acquired in this positioning process. By executing complementary cell ID positioning, which is positioning, a situation in which positioning is impossible is avoided.

  In addition, Patent Document 2 has an advantage that the positioning time is short in the network-assisted positioning, but it is necessary to perform data communication for acquiring the acquisition information, so that the burden on the communication fee is imposed on the user. There is a problem that it is large, and there is a problem that GPS positioning cannot be performed in an area where data communication is impossible, but there is disclosure that the complementary cell ID positioning can respond appropriately to both problems .

On the other hand, in recent years, positioning data, which is a GPS positioning calculation processing result on the mobile terminal device side using assist information, is periodically and automatically acquired by background processing, and the acquired positioning data is A mobile communication system that is notified to the content distribution company side is operating (see, for example, Non-Patent Document 1).
In a mobile communication system such as that described in Non-Patent Document 1, a communication carrier or content distribution carrier grasps the location of a mobile terminal device based on the notified positioning data and matches the location at the present time. A so-called push-type information distribution service, such as distributing weather forecasts and city event information, has been implemented.

In the mobile terminal device that is the target of the information distribution service using the positioning data as described above, a device that can reduce the power required for executing the GPS positioning as much as possible while mounting the GPS positioning function. Has been made.
In other words, the mobile terminal device is provided with an acceleration sensor (walking detection unit) and a detection function unit for the sector ID corresponding to the area where the mobile terminal device is located, thereby acquiring information on the movement status of the mobile terminal device and the location history of the own device. However, power saving is achieved by reducing the GPS positioning execution frequency based on the acquired information.

More specifically, this power saving method is as follows. First, as a premise for applying this method, basically, periodic GPS positioning is continuously executed. Here, in the periodic GPS positioning procedure, positioning is repeatedly executed at a constant cycle defined by the time measuring means of the mobile terminal device.
At the start of positioning, the data processing engine in the mobile terminal device determines the validity of the already obtained assist information. In this validity determination, if it is determined that the already obtained assist information is valid, the assist information is not acquired again from the network side, but received from the GPS satellite using the already obtained assist information. Autonomous positioning is performed to perform positioning calculation based on positioning information.

  On the other hand, if it is determined that the obtained assist information is invalid, A-GPS positioning is executed. A-GPS positioning here is performed in the following procedures. That is, first, a session is established with the network side, and after the establishment, assist information is requested from the network side. As a response to the request, assist information that is valid at the present time is acquired from the network side. Then, using the acquired assist information, the positioning calculation is executed based on the positioning information received from the GPS satellite.

The network side is notified of positioning result data acquired by the execution of the A-GPS positioning or information indicating that positioning is impossible. The session is released after this notification.
An area where continuous walking is not detected by the acceleration sensor or the acquired location history is effective while performing the periodic GPS positioning as described above as a basic GPS positioning procedure. When entering again, the GPS positioning is stopped. Then, the current positioning information is replaced by the already obtained positioning information, and power consumption corresponding to this positioning suspension is reduced.

Japanese Patent No. 4312233 Japanese Patent No. 4240216

Interviewee: Yoshiaki Maeda (Interviewer: Hisashi Kamio) “Mobile + Views of Hisao Kamio:“ i-concier ”is a new phase with auto GPS support” [online], updated 15:44 on November 16, 2009 Search on April 2, 2010], Internet <URL: http://www.itmedia.co.jp/promobile/articles/0911/16/news052.html>

However, in the technologies described in Patent Document 1 and Patent Document 2 described above, there is a lack of recognition of technical problems such as power saving in the mobile terminal device. Therefore, as a matter of course, a solution that focuses on this technical problem. The way is not shown.
That is, in the mobile terminal device in Patent Document 1, it is said that a positioning method can be selected in response to a request for “application” or the like, but the content of such “application” is not explicitly stated, There is no indication as to how the positioning is performed in the context of powering.

  The technique of Patent Document 2 focuses exclusively on how to reduce the frequency of communication with the network in order to reduce the communication cost. Is done. This is because the mobile terminal device disclosed in this document uses the data obtained at the previous GPS positioning without performing the operation of acquiring the approximate position again (acquisition of assist state) in the second and subsequent GPS positioning. However, there is no change in performing A-GPS positioning periodically and, therefore, power consumption for covering the A-GPS positioning operation which is the positioning method with the most power consumption is repeated every time the positioning operation is repeated. Since it occurs, it is extremely insufficient when viewed from the viewpoint of power saving.

On the other hand, the technique described in Non-Patent Document 1 basically adopts a mode in which periodic GPS positioning is continuously executed. Therefore, depending on the environment of the mobile terminal device at the time of positioning execution, GPS In spite of the fact that positioning is impossible, GPS positioning is always executed at a constant cycle when the movement of the device itself is detected and the positioning result is not present. In such a case, a notification that the positioning has failed is issued to the network side, but since GPS positioning calculation that consumes much more power than other data processing in the mobile terminal device is executed, This presents an undesired situation where the power consumption is significant despite the invalid computation results.
The present invention has been made in view of the above situation, and an object of the present invention is to provide a mobile terminal device that can achieve further power saving as compared with a conventional mobile terminal device equipped with a GPS positioning function. To do.

In order to solve the above-mentioned problems, the present application proposes the following techniques.
(1) A mobile terminal device capable of selectively and repeatedly performing positioning of a plurality of different methods for obtaining position information of the own device,
A positioning timing base unit that generates a positioning timing base signal that defines a timing for executing each positioning in the case of repeated positioning;
A positioning result holding unit that holds at least temporarily positioning data corresponding to the results of each positioning;
A transceiver that communicates with the base station;
Using the assist information acquisition process for acquiring GPS assist information including the approximate position information of the own apparatus from the information acquired by the transmission / reception unit through communication with the base station, and the GPS assist information acquired in the assist information acquisition process An A-GPS positioning unit that executes A-GPS positioning including positioning calculation processing at a timing synchronized with the positioning timing base signal;
An autonomous GPS positioning unit that executes autonomous GPS positioning without using the GPS assist information at a timing synchronized with the positioning timing base signal;
A GPS assist information history holding unit for holding a history of GPS assist information including the approximate position information used for the A-GPS positioning performed in the past by the A-GPS positioning unit;
A history determination unit that determines whether the current position of the device corresponds to the approximate position information held in the GPS assist information history holding unit;
A GPS positioning result determination unit that determines whether or not the autonomous GPS positioning by the autonomous GPS positioning unit is properly executed;
When a negative determination is made by the GPS positioning result determination unit and a positive determination result is obtained by the history determination unit, the positioning start timing base unit determines the positioning timing after the determination. when issuing the base signal, the positioning together to regulate the execution of the positioning calculation process by the a-GPS positioning unit, the corresponding approximate position information is held prior Symbol GPS assist information history holding unit as the positioning data When it is held in the result holding unit and the GPS positioning result determination unit makes a negative determination and the history determination unit obtains a negative determination result, at the time after the determination, the positioning when start timing base unit has issued a positioning timing base signal, while restricting the execution of the positioning calculation process by the a-GPS positioning unit, performs the assist information acquiring process The approximate position information of the own device acquired by the assist information acquiring process is held in the positioning result holding unit as the positioning data, when made a positive determination is made in the GPS positioning result determining unit, the autonomous GPS positioning and alternative positioning data selecting unit which positioning data Ru is held on the positioning result holding unit obtained by,
A mobile terminal device comprising:

  It becomes possible to achieve further power saving in a mobile terminal device equipped with a GPS positioning function.

It is a functional block diagram showing the mobile terminal device as an embodiment of the invention. It is a flowchart showing operation | movement of the mobile terminal device of FIG.

Hereinafter, the present invention will be clarified by describing embodiments of the present invention in detail with reference to the drawings.
(Configuration of mobile terminal apparatus as an embodiment of the present invention)
FIG. 1 is a functional block diagram showing a mobile terminal apparatus as an embodiment of the present invention.
The mobile terminal apparatus 10 includes a transmission / reception unit 101 that communicates with a corresponding base station 21 of the mobile communication network 20 and a satellite radio wave reception unit 102 that receives a signal from a GPS satellite. The mobile communication network 20 itself is a single network, but as is well known, it is connected to another network 30 such as the Internet.

  The mobile terminal device 10 also includes a walking detection unit 103 that detects a walking situation of a user having the mobile terminal device 10 using an acceleration sensor or the like, a visiting sector monitoring unit 104 that monitors and specifies a visiting sector, and a walking detection unit 103. And the stationary stationary state determination unit 105 for determining the stationary state of the mobile terminal device 10 based on the detected sector information and the information on the in-service sector specified by the visited sector monitoring unit 104, and the positioning result described later. A location notification unit 106 that notifies the mobile communication network 20 side of the location information of the mobile terminal device 10 through the transmission / reception unit 101 is provided.

The mobile terminal apparatus 10 further includes a positioning control unit 110 that executes positioning.
The positioning control unit 110 includes a positioning timing base unit 111, an autonomous GPS positioning unit 112, an environment estimation unit 113, a GPS assist information history holding unit 141, a history determination unit 142, a GPS positioning result determination unit 143, and an alternative positioning data selection unit. 144, the A-GPS positioning unit 120, and the positioning history unit 130.

The A-GPS positioning unit 120 includes an assist information acquisition processing unit 121 that performs assist information acquisition processing, and a positioning calculation processing unit 122 that performs positioning calculation processing using the GPS assist information acquired by the assist information acquisition processing unit 121. .
The positioning history unit 130 includes a located sector history unit 131 that holds a located sector history related to the mobile terminal device 10 and a positioning result history unit (that is, a positioning result holding unit) 132 that holds a history of positioning results. .

  The above-described mobile terminal apparatus 10 can selectively and repeatedly execute positioning using a plurality of different methods for obtaining position information of the own apparatus. Here, the different types of positioning are the A-GPS positioning method and the autonomous GPS positioning method described below, but GPS positioning is not performed under specific conditions, and approximate position information ( This includes a simple positioning method in which information (position information by rough positioning at a cell or sector level) is extracted, and information obtained by the extraction is applied as a GPS positioning result to be replaced with actual positioning.

The positioning timing base unit 111 generates a positioning timing base signal that serves as a basis for defining the timing of execution of each positioning when repeated positioning is performed as described above.
In addition, the positioning result holding unit 132 of the positioning history unit 130 at least temporarily stores the positioning data corresponding to the above-described positioning results (that is, the positioning data based on the actual positioning and the approximate position information replaced with the actual positioning). Hold.

  The A-GPS positioning unit 120 executes A-GPS positioning at a timing synchronized with the positioning timing base signal generated by the positioning timing base unit 111. A-GPS positioning includes the following processing. That is, the assist information acquisition processing unit 121 acquires GPS assist information including the approximate position information of its own device by communicating with the base station 21 through the transmission / reception unit 101, and the positioning calculation processing unit 122. The positioning calculation process is performed using the GPS assist information acquired in the assist information acquisition process.

Further, the environment estimation unit 113 estimates whether the current position of the own device corresponds to the indoor environment or the outdoor environment.
Then, when the environment estimation unit 113 estimates that the current position of the own device corresponds to the indoor environment, when the positioning start timing base unit 111 issues a positioning timing base signal at the time after the estimation, the autonomous GPS The A-GPS positioning unit 120 is restricted from executing autonomous GPS positioning by the positioning unit 112 (in this case, assist information acquisition processing by the assist information acquisition processing unit 121 in the A-GPS positioning unit 120). Is executed.

On the other hand, the GPS assist information history holding unit 141 holds a history of GPS assist information including approximate position information used for A-GPS positioning performed in the past by the A-GPS positioning unit 120.
Further, the history determination unit 142 determines whether or not the current position of the own device corresponds to the approximate position information held in the GPS assist information history holding unit 141.
Furthermore, the GPS positioning result determination unit 143 determines whether or not the autonomous GPS positioning by the autonomous GPS positioning unit 112 has been properly executed.

  Furthermore, when the GPS positioning result determination unit 143 makes a negative determination (that is, when the GPS positioning is unsuccessful), the alternative positioning data selection unit 144 starts positioning after the determination. When the timing base unit 111 issues a positioning timing base signal, the A-GPS positioning unit 120 restricts the execution of the positioning calculation process. When the history determination unit 142 obtains a positive determination result (that is, when it is determined that the current position of the own device corresponds to the approximate position information held in the GPS assist information history holding unit 141). The corresponding approximate position information held in the GPS assist information history holding unit 141 is held in the positioning result holding unit 132 as the above positioning data. On the other hand, when the history determination unit 142 obtains a negative determination result (that is, when the current position of the device itself is determined not to correspond to the approximate position information held in the GPS assist information history holding unit 141). Causes the positioning result holding unit 132 to hold the approximate position information of the own device acquired by the assist information acquisition process described above as positioning data.

In addition, the environment estimation unit 113 according to one aspect of the present embodiment uses the A-GPS positioning unit 120 to obtain acquired positioning data held at the most recent time in the past among the positioning data held in the positioning result holding unit 132. If it is positioning data based on either A-GPS positioning or autonomous GPS positioning by the autonomous GPS positioning unit 112, and if the accuracy of the position based on the acquired positioning data does not satisfy a predetermined level, Estimate that the location corresponds to the outdoor environment. Refer to FIG. 2 below for the selection of the positioning method according to these estimation results, the presence / absence of positioning execution, and the handling of data representing the current position as an alternative to the actual positioning calculation result data. Will be described in detail.

(Operation of Mobile Terminal Device as Embodiment of the Present Invention)
Next, the operation of the mobile terminal apparatus as an embodiment of the present invention will be described with reference to the drawings.
FIG. 2 is a flowchart showing the operation of the mobile terminal apparatus of FIG.
When the operation is started, although not shown, the timing operation for generating the above-described positioning timing base signal proceeds in the positioning timing base unit 111 as background processing.
When performing positioning based on the positioning timing base signal, first, information valid at the current time is stored in the history of assist information (including approximate position information) held in the GPS assist information history holding unit 141. It is determined whether or not it exists (step S201).

  If it is determined in step S201 that valid information exists at the present time in the assist information history stored in the GPS assist information history storage unit 141 (step S201: Yes), then the previous positioning is performed. It is determined whether or not the result is data obtained by GPS positioning, or the accuracy of the obtained approximate position information held in the positioning result holding unit 132 falls below level 2. (Step S202).

In step S202, determining that the previous positioning result corresponds to the data obtained by GPS positioning means that the previous positioning was in an outdoor environment where GPS positioning could be performed effectively. There is a high probability that the situation has not changed yet at the current time point close in time from the time when the positioning is performed, and therefore, an estimation result is obtained that it is still located in the outdoor environment.
In addition, the accuracy of the obtained approximate position information (in the latest past) held in the positioning result holding unit 132 is level 2 or less, that is, the arrangement density of base stations is sparse compared to indoors. It is highly probable that the user is located in an outdoor environment where the position accuracy represented by the approximate position information is relatively low.

  The level relating to the accuracy of the approximate position information in the above is the following index. That is, the above-mentioned positioning level 2 has a level of accuracy that can be said to be relatively accurate position information with an error range of approximately less than 300 meters. Further, the positioning level 3 described later is a level of accuracy that can be said to be almost accurate position information with an error range of less than about 50 meters. Furthermore, the positioning level 1 is rough level position information with an error range of approximately 300 meters or more.

In the estimation processing of whether indoor or outdoor as described above in step S202, it is effective to pay attention to the situation as described above, regardless of whether it is actually indoor or outdoor. Whether it is considered indoor or outdoor is discriminated and the estimation result is obtained as described above.
This determination (estimation) in step S202 is executed by the environment estimation unit 113 of the positioning control unit 110.
If it is determined in step S202 that the mobile terminal device 10 is in the indoor environment (step S202: No), then, an assist information acquisition process that is a process of the first step of the A-GPS positioning is executed (step S202). S203).
The assist information acquired by the assist information acquisition process of step S203 is held in the GPS assist information history holding unit 141.

The process from step S202 to step S203 is, in other words, when it is estimated that the mobile terminal device 10 is in the indoor environment in step S202 (step S202: No), the positioning start timing at the time after the estimation. When the base unit 111 issues a positioning timing base signal, the autonomous GPS positioning unit restricts execution of autonomous GPS positioning, and assist information acquisition processing that is processing of the first step of A-GPS positioning is performed. This is the processing to be executed (step S203).
Next, it is determined whether or not the position accuracy of the approximate position information in the corresponding assist information held in the GPS assist information history holding unit 141 corresponds to the level 3 or higher (step S204). .

  It is determined that the determination result in step S204 is affirmative, that is, the accuracy of the position based on the approximate position information in the corresponding assist information held in the GPS assist information history holding unit 141 corresponds to the level 3 or higher described above. When the positioning timing base unit 111 issues a positioning timing base signal at the time after the determination (step S204: Yes), the positioning calculation processing by the A-GPS positioning unit 120 (the positioning calculation processing unit 122) is performed. And the approximate position information for which a positive determination is made as described above is applied as current positioning data (step S205), and this data is stored in the positioning result holding unit 132 (step S213). .

On the other hand, the determination result in step S204 is negative, that is, the accuracy of the position based on the approximate position information in the corresponding assist information held in the GPS assist information history holding unit 141 does not correspond to the level 3 or higher described above. Is determined (step S204: No), when the positioning timing base unit 111 issues a positioning timing base signal, a positioning calculation process by the A-GPS positioning unit 120 (the positioning calculation processing unit 122) is executed ( Step S206).
Next, it is determined whether or not the positioning calculation process executed in step S206 is successful within a predetermined time such as within 10 seconds (step S207).
When it is determined in step S207 that the A-GPS positioning in step S206 has succeeded within the predetermined time (step S207: Yes), the positioning result data by the A-GPS positioning is stored in the positioning result holding unit 132 (step S207). S213).

On the other hand, when it is determined in step S207 that the A-GPS positioning in step S206 has failed (step S207: No), the process proceeds to step S205 described above.
On the other hand, in the above-described step S202, the previous positioning result is data obtained by GPS positioning, or the accuracy of the obtained approximate position information held in the positioning result holding unit 132 is equal to or lower than the level 2 described above. When the mobile terminal apparatus 10 does not correspond to any of the above, the mobile terminal apparatus 10 is highly likely to be located in the outdoor environment as described above, and thus is estimated to be in the outdoor environment (step S202: Yes).

  If the outdoor environment is estimated in step S202 (step S202: Yes), GPS positioning is effective, and therefore autonomous GPS positioning is executed (step S208). In other words, the autonomous GPS positioning is allowed to be executed only when the autonomous GPS positioning is effective and the outdoor environment is highly probable, and when the indoor environment is determined as described above (step S202: No) Since this execution is restricted, it is possible to prevent the autonomous GPS positioning that consumes a large amount of power from being performed in vain, and thus the power saving effect of the mobile terminal apparatus 10 is significant.

Next, the GPS positioning result determination unit 143 determines whether or not the autonomous GPS positioning executed in step S208 is successful (step S209).
When the determination result in step S209 by the GPS positioning result determination unit 143 is negative, that is, when it is determined that the autonomous GPS positioning has failed (step S209: No), the positioning is started at the time after the determination. When the timing base unit 111 issues a positioning timing base signal, the A-GPS positioning unit 120 restricts the execution of the positioning calculation process, and the data of the current sector ID of the mobile terminal device 10 is the positioning history. It is determined whether or not it remains in the located sector history section 131 of the section 130 (step S210).

  When an affirmative determination result is obtained in the determination of step S210, that is, when the data of the serving sector ID at the current time of the mobile terminal device 10 remains in the serving sector history unit 131 of the positioning history unit 130 (Step S210: Yes), position data corresponding to the corresponding sector ID held in the located sector history unit 131 is allocated as positioning data (Step S211), and this data is stored in the positioning result holding unit 132. (Step S213).

In addition, when a negative determination result is obtained in the determination of step S210, that is, the data of the sector sector ID at the current time point of the mobile terminal device 10 remains in the sector sector history unit 131 of the positioning history unit 130. If not (step S210: No), an assist information acquisition process that is a process of the first step of the A-GPS positioning is executed (step S221).
The assist information acquired by the assist information acquisition process in step S221 is held in the GPS assist information history holding unit 141.

Next, with regard to the approximate position information in the assist information held in the GPS assist information history holding unit 141, whether or not the accuracy of the position is equal to or higher than the level 3 described above and corresponds to the current position of the own device is recorded. The determination unit 142 determines (step S222).
When the determination result in step S222 is affirmative, that is, when it is determined that the position accuracy based on the approximate position information in the assist information held in the GPS assist information history holding unit 141 corresponds to the level 3 or higher described above. (Step S222: Yes) When the positioning timing base unit 111 issues a positioning timing base signal at the time after the determination, the A-GPS positioning unit 120 (the positioning calculation processing unit 122) executes the positioning calculation processing. The approximate position information that has been positively determined by the history determination unit 142 is applied as current positioning data (step S205), and this data is stored in the positioning result holding unit 132 (step S213).

In addition, the determination result in step S222 is negative, that is, it is determined that the position accuracy based on the approximate position information in the assist information held in the GPS assist information history holding unit 141 is less than the level 3 described above. Sometimes (step S222: No), timeout error processing is executed (step S214) to suppress wasteful power consumption.
On the other hand, when the determination result in step S209 is affirmative, that is, when it is determined that the autonomous GPS positioning is successful (step S209: Yes), the positioning data obtained by this autonomous GPS positioning is held as the positioning result. The data is stored in the unit 132 (step S213).

  In the mobile terminal device 10 of this embodiment, as described above, even when it is determined that the autonomous GPS positioning has failed (step S209: No), the mobile terminal remaining in the located sector history unit 131 The position data corresponding to the current sector ID of the device 10 or the approximate position information in the assist information obtained by the assist information acquisition process in the A-GPS positioning is substituted for the positioning data. (Step S209; Step S210; Step S211; Step S221; Step S222; Step S205; Step S213).

As a result, even in an environment where GPS positioning cannot be performed, the data of the current position of the own apparatus can be obtained as much as possible with the appropriate position by using the alternative position data.
The processing from step S209 to step S213 is executed by the above-described alternative positioning data selection unit 144, and has the functions described above in relation to the configuration of the mobile terminal device 10. Is summarized in

  That is, when a negative determination is made by the GPS positioning result determination unit 143 (when it is determined that the autonomous GPS positioning by the autonomous GPS positioning unit 112 has not been properly performed), at the time after the determination. When the positioning start timing base unit 111 issues a positioning timing base signal, the execution of the positioning calculation process by the A-GPS positioning unit 120 is restricted, and the history determination unit 142 obtains a positive determination result. When the corresponding approximate position information held in the GPS assist information history holding unit 141 is held in the positioning result holding unit 132 as positioning data, and the history determination unit 142 obtains a negative determination result, the assist information The approximate position information of the own device acquired by the acquisition process is held in the positioning result holding unit 132 as positioning data.

Further, when it is determined in step S207 described above that the A-GPS positioning in step S206 has failed because a positioning result cannot be obtained within a predetermined time (step S207: No), timeout error processing is executed (step S207). S214) Useless power consumption is suppressed.
In the above-described example, when it is determined in step S207 that the A-GPS positioning in step S206 failed because a positioning result could not be obtained within a predetermined time (step S207: No), timeout error processing is executed. However, instead of shifting to step S214, the process shifts from step S207 (when the determination result is No) to step S205 described above, and the approximate position data in the assist information already obtained in step S203 is obtained. You may make it use as positioning data.

  Further, in the above-described example, when the data of the current location sector ID does not remain in the positioning history unit in step S210 (step S210: No), the first step of the A-GPS positioning is performed. A certain assist information acquisition process is executed (step S221), and then the suitability (accuracy) of the approximate position information in the assist information acquired in step S221 is determined (step S222), and the process proceeds to step S222. Instead, the approximate position data acquired in step S221 may be immediately applied as positioning data.

  As can be easily understood from the above description, in the mobile terminal device 10 according to the present embodiment, it is avoided that A-GPS positioning with significant power consumption is performed in this type of mobile terminal device. Excellent characteristics for power saving are realized. Furthermore, in one aspect of the present embodiment, it is avoided that autonomous GPS positioning or A-GPS positioning (positioning calculation processing of the two steps) is performed wastefully. The power saving effect is remarkable.

10 ……………… Mobile terminal device 20 ……………… Mobile communication network 21 ……………… Base station 30 ……………… Network 101 ……………… Transmission and reception Unit 102 ……………… Satellite radio wave receiving unit 103 ……………… Walking detection unit 104 ……………… Sustained sector monitoring unit 105 ……………… Wireless communication unit 106 ……………… ... Position notification unit 110 ……………… Positioning control unit 111 ……………… Positioning timing base unit 112 ……………… Autonomous GPS positioning unit 113 ……………… Environment estimation unit 120 …… ………… A-GPS positioning unit 121 ……………… Assist information acquisition processing unit 122 ……………… Positioning calculation processing unit 130 ……………… Positioning history unit 131 ……………… Area sector history part 132 ……………… Positioning result history part (positioning result holding part)
141 ……………… GPS assist information history holding unit 142 ……………… History determination unit 143 ……………… GPS positioning result determination unit 144 ……………… Alternative positioning data selection unit

Claims (1)

A mobile terminal device capable of selectively and repeatedly performing positioning of different methods for obtaining position information of the own device,
A positioning timing base unit that generates a positioning timing base signal that defines a timing for executing each positioning in the case of repeated positioning;
A positioning result holding unit that holds at least temporarily positioning data corresponding to the results of each positioning;
A transceiver that communicates with the base station;
Using the assist information acquisition process for acquiring GPS assist information including the approximate position information of the own apparatus from the information acquired by the transmission / reception unit through communication with the base station, and the GPS assist information acquired in the assist information acquisition process An A-GPS positioning unit that executes A-GPS positioning including positioning calculation processing at a timing synchronized with the positioning timing base signal;
An autonomous GPS positioning unit that executes autonomous GPS positioning without using the GPS assist information at a timing synchronized with the positioning timing base signal;
A GPS assist information history holding unit for holding a history of GPS assist information including the approximate position information used for the A-GPS positioning performed in the past by the A-GPS positioning unit;
A history determination unit that determines whether the current position of the device corresponds to the approximate position information held in the GPS assist information history holding unit;
A GPS positioning result determination unit that determines whether or not the autonomous GPS positioning by the autonomous GPS positioning unit is properly executed;
When a negative determination is made by the GPS positioning result determination unit and a positive determination result is obtained by the history determination unit, the positioning start timing base unit determines the positioning timing after the determination. when issuing the base signal, the positioning together to regulate the execution of the positioning calculation process by the a-GPS positioning unit, the corresponding approximate position information is held prior Symbol GPS assist information history holding unit as the positioning data When it is held in the result holding unit and the GPS positioning result determination unit makes a negative determination and the history determination unit obtains a negative determination result, at the time after the determination, the positioning when start timing base unit has issued a positioning timing base signal, while restricting the execution of the positioning calculation process by the a-GPS positioning unit performs the assist information acquiring process The approximate position information of the own device acquired by the assist information acquiring process is held in the positioning result holding unit as the positioning data, when made a positive determination is made in the GPS positioning result determining unit, the autonomous GPS positioning and alternative positioning data selecting unit which positioning data Ru is held on the positioning result holding unit obtained by,
A mobile terminal device comprising:

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