JP2003114269A - Radio communication terminal, position specifying system and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the occurrence of such a status that a user is kept waiting for a long time and neverthless, the user can acquire a low-precision positioning result only. SOLUTION: When the difference between a GPS time acquired by a GPS satellite and a system time held by a communication base station exceeds a preset value, a portable telephone prohibits the specification of the position of an owned terminal utilizing the base station search result of a position information server. If a value allowing the precision of the positioning result is set as a preset value, the position information server avoids the occurrence of such a status that the user is kept waiting for a long time and neverthless, the user can acquire a low-precision positioning result only, without specifying the position of the portable telephone 1 utilizing the low-reliability base station search result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication terminal configured to transmit a GPS satellite search result obtained by searching for a GPS satellite and a base station search result obtained by searching for peripheral base stations to a position information server, and the wireless communication. The present invention relates to a position specifying system constructed by including a terminal and a position information server, and a computer program executed by the wireless communication terminal.

[0002]

As one of the position specifying systems for specifying the position of a wireless communication terminal such as a mobile phone or a portable information terminal having a communication function, each GPS is used.
(Grobal Positioning System) G transmitted from satellite
There is a system that uses PS satellite signals and base station signals transmitted from each base station. In the system for identifying the position of the mobile phone by using the GPS satellite signal or the base station signal, the signal delay amount of the base station signal from each base station is calculated,
GP from GPS satellites that can identify the approximate position of the mobile phone based on the trigonometry from the position of each base station and can search at the approximate position of the specified mobile phone
The signal delay amount of the S satellite signal is calculated, and the accurate position of the mobile phone is specified based on the trigonometry from the position of each GPS satellite.

In this case, in a configuration in which the mobile phone independently identifies the position of its own terminal, the mobile phone holds the almanac information of the GPS satellites and the almanac information of the base station, or performs a complicated positioning calculation. Since it is necessary, there are problems that the price of the mobile phone rises and the configuration becomes complicated accordingly. Under these circumstances, the mobile phone does not specify the position of its own terminal by itself, but the mobile phone searches the GPS satellite search results or the nearby base stations search results for the base station search results in the position information server. A system has been considered in which the position information server transmits and the position of the mobile phone is specified using the GPS satellite search result or the base station search result received from the mobile phone.

By the way, in such a system for specifying the position of the mobile phone using the GPS satellite signal or the base station signal, in order to maintain the positioning accuracy to some extent when specifying the position of the mobile phone, the GPS time is used. The synchronization must be established between and the system time held by each base station. However, if the base station is reset or if there is a setting error, a synchronization shift may occur between the GPS time and the system time held by the base station. In the state where the GPS clock time and the system time held by the base station are out of synchronization, even if the position of the mobile phone is specified, the accuracy may be increased due to the out of synchronization. Only low positioning results can be provided to the user. In other words, in such a situation, from the viewpoint of the user, only a positioning result with low accuracy can be acquired while waiting for a long time, which is inconvenient.

The present invention has been made in view of the above circumstances, and an object thereof is to avoid a situation in which a user waits for a long time and can obtain only a positioning result with low accuracy. It is possible to provide a wireless communication terminal, a position specifying system, and a computer program that can improve convenience.

[0006]

According to a first aspect of the present invention, there is provided a wireless communication terminal, wherein the control means includes a GPS time acquired by the GPS time acquisition means and a communication base station acquired by the system time acquisition means. When the difference between the GPS time and the system time exceeds a predetermined value, the stored system time is compared, and it is prohibited to specify the position of the own terminal using the base station search result in the position information server. Configured to.

Therefore, by setting a value that allows the accuracy of the positioning result as a predetermined value, the GPS system in which the system time held by the communication base station is an absolute time.
If the position information server deviates from the time by more than the allowable value, the position information server will lose synchronization with the communication base station even if the base station search result is received from the communication base station. Therefore, the position of the wireless communication terminal is not specified by using the received unreliable base station search result. As a result, it is possible to avoid a situation in which the user has to wait a long time and only obtain a positioning result with low accuracy, and it is possible to improve convenience.

According to the wireless communication terminal of the second aspect, the control means prohibits the transmission means from transmitting the base station search result to the position information server, thereby making the base station search result in the position information server. Since it is configured to prohibit the location of the own terminal used, by a simple change to prohibit the transmission of base station search results,
It can be easily achieved.

According to the wireless communication terminal of the third aspect, the control means causes the transmission means to transmit the base station search result to the position information server, and the transmission means transmits a signal indicating that the synchronization is deviated. By transmitting the information to the information server, it is configured to prohibit the location of the own terminal using the base station search result in the location information server. Therefore, it is necessary to change the conventional positioning sequence of transmitting the base station search result. Without, it can be easily realized.

According to the wireless communication terminal of the fourth aspect, the synchronization deviation information receiving means receives the synchronization deviation information indicating whether or not the base station is out of synchronization from each base station, and the synchronization deviation information is received. The storage means stores the synchronization deviation information received by the synchronization deviation information receiving means from each base station, and the control means stores the synchronization deviation information stored in the synchronization deviation information storage means for each peripheral base station. If the number of peripheral base stations that are not out of synchronization has not reached a predetermined number, the position information server is configured to prohibit the identification of the position of the own terminal using the base station search result.

Therefore, by setting the number of stations that allows the accuracy of the positioning result as the predetermined number of stations, the number of normal peripheral base stations that are not out of synchronization can allow the accuracy of the positioning result. If the number is not satisfied, in the same way as described in claim 1 above, even if the position information server receives the base station search result from the communication base station, the base station search result is Since most of the included peripheral base stations are out of synchronization, the position of the wireless communication terminal is not specified by using the received unreliable base station search result. As a result, it is possible to avoid a situation in which the user has to wait a long time and only obtain a positioning result with low accuracy, and it is possible to improve convenience.

According to the wireless communication terminal of the fifth aspect, the control means has the GPS time acquired by the GPS time acquisition means and the system time held by each base station acquired by the system time acquisition means. When there is a base station whose difference between the GPS time and the system time exceeds a predetermined value, that is, the system time held by the base station exceeds the predetermined value from the GPS time which is an absolute time. If there is a base station that is out of sync, the fact that the base station is out of sync is stored in the out-of-sync information storage means,
Then, the synchronization deviation information stored in the synchronization deviation information storage means is determined for each peripheral base station, and if the number of peripheral base stations that are not in synchronization has not reached the predetermined number, the position information server It is configured to prohibit the identification of the position of the own terminal using the search result of the base station in.

Therefore, also in this case, as in the case of the above-mentioned claim 4, by setting the number of stations that allows the accuracy of the positioning result as the predetermined number of stations, synchronization is not deviated. If the number of normal peripheral base stations does not satisfy the number of stations that can accept the accuracy of the positioning result, the location information server will not be able to receive the base station search result from the communication base station thereafter. Since most of the peripheral base stations included in the station search result are out of synchronization, the position of the wireless communication terminal is not specified using the received low-reliability base station search result. As a result, it is possible to avoid a situation in which the user has to wait a long time and only obtain a positioning result with low accuracy, and it is possible to improve convenience.

According to the wireless communication terminal of the sixth aspect, the control means causes the transmission means to transmit the GPS satellite search result to the position information server, so that the position information server uses the GPS satellite search result. Since the position information server is configured to permit specification of the position of the wireless communication terminal, even if the position information server cannot specify the position of the wireless communication terminal using the search result of the base station, wireless communication is performed using the GPS satellite search result. The location of the terminal can be specified.

According to the position specifying system of claim 7, the wireless communication terminal according to any one of claims 1 to 6 and the GPS satellite search result or the base station search result received from the wireless communication terminal are used. Since it is constructed by including a position information server that specifies the position of the wireless communication terminal, the same as described in the above claims 1 to 3,
It is possible to avoid a situation in which the user has to wait a long time and only obtain a positioning result with low accuracy.

According to the computer program of the eighth aspect, when the computer program is installed in a wireless communication terminal and executed, a procedure for acquiring GPS time and a system time held by a communication base station are acquired. And the procedure of comparing the GPS time and the system time, and when it is determined that the difference between the GPS time and the system time exceeds a predetermined value, the self-timer using the base station search result in the position information server. Since the procedure for prohibiting the specification of the position of the terminal is executed, it is possible to obtain the same operational effect as that described in the above-mentioned claim 1. That is, by setting a value that allows the accuracy of the positioning result as the predetermined value, it is possible to avoid a situation in which the user waits for a long time and can obtain only the positioning result with low accuracy. It is possible to improve convenience.

According to the computer program of the ninth aspect, when the computer program is installed in a wireless communication terminal and executed, synchronization deviation information indicating whether or not the base station is out of synchronization from each base station. , A procedure of storing the synchronization deviation information received from each base station, a procedure of determining the synchronization deviation information stored in the peripheral base station, When it is determined that the number of stations has not reached the predetermined number, the procedure for prohibiting the identification of the position of the own terminal using the base station search result in the position information server will be executed. It is possible to obtain the same effects as those described in item 4. That is, by setting the number of stations that allows the accuracy of the positioning result as the predetermined number of stations, the situation in which the user waits for a long time and can obtain only the positioning result with low accuracy is obviated. It can be avoided and convenience can be improved.

According to the computer program of the tenth aspect, when the computer program is installed and executed in a wireless communication terminal, a procedure for acquiring GPS time and a system time held by each base station are acquired. And a procedure for comparing the GPS time and the system time, and when it is determined that there is a base station in which the difference between the GPS time and the system time exceeds a predetermined value, the base station is out of synchronization. It is determined that the number of neighboring base stations that are not out of synchronization has not reached the predetermined number At this time, the procedure for prohibiting the identification of the position of the own terminal using the search result of the base station in the position information server will be executed. It is possible to obtain the same effects as those described. That is, by setting the number of stations that allows the accuracy of the positioning result as the predetermined number of stations, the situation in which the user waits for a long time and can obtain only the positioning result with low accuracy is obviated. It can be avoided and convenience can be improved.

According to the wireless communication terminal of the eleventh aspect, the control means includes the GPS time acquired by the GPS time acquisition means and the system time held by the communication base station acquired by the system time acquisition means. When the difference between the GPS time and the system time exceeds a predetermined value, the position of the terminal itself is prohibited from being specified by using the base station search result.

Therefore, even in the configuration in which the wireless communication terminal independently specifies the position of its own terminal, by setting the value that allows the accuracy of the positioning result as the predetermined value,
If the system time held by the communication base station deviates from the GPS time, which is an absolute time, by a value exceeding the accuracy of the positioning result, it is assumed that the base station search result is received from the communication base station thereafter. However, since the communication base station is out of synchronization, the position of the own terminal is not specified by using the received unreliable base station search result.
As a result, it is possible to avoid a situation in which the user has to wait a long time and only obtain a positioning result with low accuracy, and it is possible to improve convenience.

According to the wireless communication terminal of the twelfth aspect, the synchronization deviation information receiving means receives the synchronization deviation information indicating whether or not the base station is out of synchronization from each base station, and the synchronization deviation information is received. The storage means stores the synchronization deviation information received by the synchronization deviation information receiving means from each base station, and the control means stores the synchronization deviation information stored in the synchronization deviation information storage means for each peripheral base station. If the number of peripheral base stations that are not out of synchronization has not reached the predetermined number, the position of the terminal itself is prohibited from being specified using the base station search result.

Therefore, by setting the number of stations that allows the accuracy of the positioning result as the predetermined number of stations, the number of normal peripheral base stations that are not out of synchronization can allow the accuracy of the positioning result. If the number is not satisfied, then even if the base station search result is received from the communication base station, the peripheral base stations included in the base station search result are received in the same manner as described in claim 11 above. Since most of them are out of synchronization, the position of the terminal itself is not specified by using the received unreliable base station search result. As a result, it is possible to avoid a situation in which the user has to wait a long time and only obtain a positioning result with low accuracy, and it is possible to improve convenience.

According to the wireless communication terminal of the thirteenth aspect, the control means has the GPS time acquired by the GPS time acquisition means and the system time held by each base station acquired by the system time acquisition means. If there is a base station whose difference between the GPS time and the system time exceeds a predetermined value, that is, the system time held by the base station exceeds the predetermined value from the GPS time which is an absolute time. If there is a base station that is out of sync, the fact that the base station is out of synchronization is stored in the out-of-sync information storage means, and the out-of-sync information stored in the out-of-sync information storage means for each peripheral base station is stored. The information is judged, and if the judgment result does not satisfy the predetermined condition, the position of the own terminal is prohibited from being specified by using the base station search result.

Therefore, also in this case, as in the case of the above-mentioned claim 12, by setting the number of stations that allows the accuracy of the positioning result as the predetermined number of stations, synchronization is not deviated. If the number of normal peripheral base stations does not satisfy the number of stations that can accept the accuracy of the positioning result, even if the base station search result is received from the communication base station thereafter, it is included in the base station search result. Since most of the peripheral base stations are out of synchronization, the position of the own terminal is not specified by using the received unreliable base station search result. As a result, it is possible to avoid a situation in which the user has to wait a long time and only obtain a positioning result with low accuracy, and it is possible to improve convenience.

According to the wireless communication terminal of the fourteenth aspect, the control means is configured to permit the specification of the position of the own terminal using the GPS satellite search result, so that the base station search result is used. Even if the position of the own terminal cannot be specified, the position of the own terminal can be specified using the GPS satellite search result.

According to the computer program of the fifteenth aspect, when the computer program is installed in a wireless communication terminal and executed, a procedure for acquiring GPS time and a system time held by a communication base station are acquired. And a procedure for comparing the GPS time with the system time, and when the difference between the GPS time and the system time is determined to exceed a predetermined value, the position of the own terminal is identified using the base station search result. Since the procedure for prohibiting is executed, it is possible to obtain the same effect as that described in claim 11 above. That is,
By setting the value that allows the accuracy of the positioning result as the predetermined value, it is possible to avoid the situation where the user waits for a long time and can only acquire the positioning result with low accuracy. It is possible to improve convenience.

According to the computer program of the sixteenth aspect, when the computer program is installed in a wireless communication terminal and executed, synchronization deviation information indicating whether or not the base station is out of synchronization from each base station. , A procedure of storing the synchronization deviation information received from each base station, a procedure of determining the synchronization deviation information stored in the peripheral base station, The procedure for prohibiting the identification of the position of the own terminal using the base station search result when it is determined that the number of stations has not reached the predetermined number of stations, so the method according to claim 12 above. It is possible to obtain the same operational effects as those obtained. That is, by setting the number of stations that allows the accuracy of the positioning result as the predetermined number of stations, the situation in which the user waits for a long time and can obtain only the positioning result with low accuracy is obviated. It can be avoided and convenience can be improved.

According to the computer program of claim 17, when the computer program is installed in a wireless communication terminal and executed, a procedure for acquiring GPS time and a system time held by each base station are acquired. And a procedure for comparing the GPS time and the system time, and when it is determined that there is a base station in which the difference between the GPS time and the system time exceeds a predetermined value, the base station is out of synchronization. It is determined that the number of neighboring base stations that are not out of synchronization has not reached the predetermined number At this time, the procedure for prohibiting the identification of the position of the own terminal using the base station search result will be executed.
It is possible to obtain the same operational effects as those described in.
That is, by setting the number of stations that allows the accuracy of the positioning result as the predetermined number of stations, the situation in which the user waits for a long time and can obtain only the positioning result with low accuracy is obviated. It can be avoided and convenience can be improved.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) Hereinafter, a wireless communication terminal of the present invention will be described with reference to a GPS (Grobal Positioning System).
tem) A first embodiment applied to a mobile phone used in a system for identifying the position of the mobile phone using satellite signals and base station signals will be described with reference to FIGS. 1 to 4. It should be noted that the first embodiment is mainly concerned with claims 1, 8, 11, and 15 of the present invention.
It corresponds to.

First, FIG. 2 schematically shows the overall configuration of the position specifying system. The mobile phone 1 determines a communication base station from a plurality of base stations 2 based on, for example, a received electric field strength of a base station signal, and the determined communication base station transmits a position information server through a CDMA (Code Division Multiple Access) network 3. Various kinds of information are transmitted to and received from the mobile terminal 4. Mobile phone 1 and location information server 4
Receives a GPS satellite signal from a GPS (Grobal Positioning System) satellite 5. In addition, the location information server 4
Holds almanac information about the GPS satellite 5 and almanac information about the base station 2.

FIG. 3 schematically shows functional blocks of the mobile phone 1. The mobile phone 1 includes a CPU (Central Processing Uni) mainly composed of a microcomputer.
t) 6 (control means in the present invention), the GPS radio unit 7 (GPS time acquisition means in the present invention) for searching the GPS satellites 5, the base station 2, and the position information server 4
A CDMA radio unit 8 (system time acquisition means and transmission means in the present invention) for transmitting and receiving information to and from the CDMA network 3, and a transmission voice input from the microphone 9 and a reception voice output from the speaker 10 are processed. A voice processing unit 11, an operation unit 12 including a keypad in which a number of keys such as a "call start" key, a "call end" key, and "number" keys of "0" to "9" are arranged, and a date. A display unit 13 including a liquid crystal display for displaying the time and telephone number, and a RAM (Random Access Memo)
ry) and a storage unit 14 including a ROM (Read Only Memory). In this case, the operation unit 12 may be a touch panel type that is displayed on the display unit 13, and has a configuration in which the antenna of the GPS radio unit 7 and the antenna of the CDMA radio unit 8 are combined. Is also good.

Next, the operation of the above configuration will be described with reference to FIG.
Also, description will be made with reference to FIG. First, the mobile phone 1
In FIG. 1, when the CPU 6 receives a positioning start request from the CDMA network 3 or detects a positioning start instruction from the user, as shown in FIG. 1, the CPU 6 receives a positioning start request from the CDMA radio unit 8. The positioning request is transmitted to the position information server 4. The location information server 4
When the positioning request is received from the mobile phone 1, it is determined whether or not the positioning can be performed, and when it is determined that the positioning can be executed, the positioning response is transmitted to the mobile phone 1.

In the mobile phone 1, when the CPU 6 receives the positioning response from the position information server 4 by the CDMA radio unit 8, the peripheral base station 2 located around the communication base station 2
Is searched (step S101). And CPU6
Causes the position information server 4 to transmit the base station search result obtained by searching the peripheral base station 2 from the CDMA radio unit 8.

Upon receiving the base station search result from the mobile phone 1, the position information server 4 sets a positioning reference point based on the received base station search result and specifies the reference base station 2. Then, the position information server 4 refers to the almanac information of the base station 2 to acquire the latitude and longitude of each peripheral base station 2 based on the base station search result received from the mobile phone 1, and the reference base station 2 Each peripheral base station 2 based on the relative relationship of the signal delay amount of each base station signal from each peripheral base station 2 with reference to the signal delay amount of each base station signal from
The pseudo distance between and is calculated, and the approximate position of the mobile phone 1 is specified (step S201). Then, the position information server 4 sets search timing and search time for the mobile phone 1 to search for GPS satellites, and transmits assist information including the set search timing and search time to the mobile phone 1.

Now, in the mobile phone 1, C
The PU 6 sends the assist information from the position information server 4 to the CDM.
When received by the A radio unit 8, the GPS satellites 5 to GPS
A satellite signal is received by the GPS radio unit 7 (step S
102), the received GPS satellite signals are demodulated by the GPS radio unit 7 to acquire GPS time (step S).
103). Next, the CPU 6 acquires the acquired GPS
The difference between the time and the system time acquired from the communication base station 2 is calculated, and the difference between the GPS time and the system time held by the communication base station 2 is compared with a predetermined value (step S1).
04). Note that the predetermined value here is a value that allows the accuracy of the positioning result, and the mobile phone 1 automatically determines the optimum value by using the learning function, or the accuracy required by the user. It is decided according to the level of.

If the difference between the GPS time and the system time held by the communication base station 2 does not exceed the predetermined value ("NO" in step S104), the CPU 6 performs normal processing thereafter. Perform (step S105). That is, the CPU 6 thereafter searches for the GPS satellite 5, and also searches for the peripheral base station 2 again based on the peripheral base station information reported from the communication base station 2, and searches for the GPS satellite from the CDMA radio unit 8. Both the GPS satellite search result and the base station search result obtained by searching the peripheral base station 2 again are transmitted to the position information server 4.

On the other hand, the CPU 6 determines that the difference between the GPS time and the system time held by the communication base station 2 exceeds a predetermined value ("YE" in step S104).
S ”), the GPS satellite 5 is searched thereafter (step S106), but the peripheral base station 2 is not searched again based on the peripheral base station information reported from the communication base station 2, and the CDMA radio unit 8 GP which searched GPS satellite 5 from
Only the S satellite search result is transmitted to the position information server 4.
Then, the position information server 4 receives the GPS from the mobile phone 1.
When only the satellite search result is received, the positioning calculation is performed using only the GPS satellite search result received from the mobile phone 1 to specify the position of the mobile phone 1 (step S20).
2) The position of the mobile phone 1 specified using only the GPS satellite search result is transmitted to the mobile phone 1 as a positioning result.

By such control, the mobile phone 1
When the difference between the GPS time and the system time held by the communication base station 2 exceeds a predetermined value, the GPS time is an absolute time, and therefore the communication base station 2 that has transmitted the system time. Is determined to be out of sync, and thereafter,
The peripheral base station 2 is not searched based on the peripheral base station information reported from the communication base station 2 which is determined to be out of synchronization, and only the GPS satellite search result obtained by searching the GPS satellite 5 is used as the position information. Send to server 4. In response to this, the position information server 4 identifies the position of the mobile phone 1 using only the GPS satellite search result received from the mobile phone 1.

In the mobile phone 1, when the difference between the GPS time and the system time held by the communication base station 2 exceeds a predetermined value, the GPS satellite 5 is searched as shown in FIG. After that, the peripheral base station 2 is searched again based on the peripheral base station information reported from the communication base station 2 (step S107), the GPS satellite search result of searching the GPS satellite 5 and the base station searching for the peripheral base station 2 are searched. It is possible to transmit both the search result and the position information server 4 and also transmit a synchronization shift signal indicating that the communication base station 2 is out of synchronization to the position information server 4. In this case, the position information is transmitted. By receiving the synchronization shift signal from the mobile phone 1, the server 4 can use the G station without using the base station search result.
The position of the mobile phone 1 is specified by using only the PS satellite search result.

Further, in the mobile phone 1, when the difference between the GPS time and the system time held by the communication base station 2 exceeds a predetermined value, the GPS satellite 5 is selectively searched. It is also possible, that is, if the search for the GPS satellites 5 is prohibited, the position information server 4
Since the GPS satellite search result is not received from the mobile phone 1, the position specification of the mobile phone 1 is forcibly stopped.

By the way, although the case where the position information server 4 specifies the position of the mobile phone 1 has been described above, the same applies to the case where the mobile phone 1 independently specifies the position of its own terminal. Process. That is, the mobile phone 1 is equipped with a large-capacity memory as the storage unit 14 to hold the almanac information about the GPS satellites 5 and the almanac information about the base station 2 so that the position of the terminal itself can be specified. When configured, if the difference between the GPS time and the system time held by the communication base station 2 does not exceed the predetermined value, the GPS satellite search result of searching the GPS satellite 5 and the peripheral base station 2 are searched. The position of the terminal itself is specified by using both of the search results of the base stations, and the difference between the GPS time and the system time held by the communication base station 2 exceeds a predetermined value. Then, the position of the terminal itself is specified using only the GPS satellite search result obtained by searching the GPS satellite 5.

As described above, according to the first embodiment, in the mobile phone 1, the difference between the GPS time acquired from the GPS satellite 5 and the system time held by the communication base station 2 is a predetermined value. Location information server 4
Since it is configured to prohibit the identification of the position of the own terminal using the base station search result in, by setting a value that can allow the accuracy of the positioning result as a predetermined value,
After that, the position information server 4 does not specify the position of the mobile phone 1 by using the unreliable base station search result, which causes the user to wait a long time and has low accuracy. It is possible to avoid the situation that only the positioning result can be obtained, and it is possible to improve the convenience.

In this case, in the mobile phone 1, the GPS
Since the GPS satellite search result obtained by searching for the satellite 5 is transmitted to the position information server 4, the position information server 4 is configured to allow the position of the own terminal to be identified using the GPS satellite search result. In 4, even if the position of the mobile phone 1 cannot be specified using the base station search result, the position of the mobile phone 1 can be specified using the GPS satellite search result.

(Second Embodiment) Next, the second embodiment of the present invention will be described.
An example will be described with reference to FIGS. 5 to 9.
The same parts as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted. Hereinafter, different parts will be described.

In the first embodiment described above, it is determined whether or not the difference between the GPS time and the system time held by the communication base station 2 in the mobile phone 1 exceeds a predetermined value.
It is configured to determine that the communication base station 2 is out of synchronization by determining that the difference between the PS time and the system time exceeds a predetermined value. In the embodiment, the mobile phone 1 receives from the base station 2 a positioning possible bit (synchronization deviation information) indicating whether or not the base station 2 is out of synchronization.
It is configured to determine that the base station 2 is out of synchronization. Incidentally, the second embodiment is mainly concerned with claim 4, claim 9, claim 12 and claim 16 in the present invention.
It corresponds to. Also, in this second embodiment, C
The DMA wireless unit 8 corresponds to the synchronization deviation information receiving unit in the present invention, and the storage unit 14 corresponds to the synchronization deviation information storing unit in the present invention.

In this second embodiment, the base station 2
As shown in FIG. 5, in a normal operating state, it is monitored whether or not a synchronization deviation has occurred (step S301), and when a synchronization deviation has occurred (“YE” in step S301).
S)), the positioning possible bit, which is one of the information elements of the synchronization channel message shown in FIG. 7, is set to “0” to indicate that the synchronization shift has occurred (step S302), and the synchronization channel message is transmitted. 1 (step S303).

Then, the base station 2 monitors whether or not the synchronization deviation is eliminated (step S304), and when the synchronization deviation is eliminated (“YES” in step S304), the above-mentioned positioning enable bit is desynchronized. Is set to "1" to indicate that the problem has been resolved (step S305), and a synchronization channel message is transmitted to the mobile phone 1 (step S30).
6). After that, the base station 2 repeats the above processing.

On the other hand, in the mobile phone 1, C
As illustrated in FIG. 6, when the PU 6 receives the synchronization channel message from the base station 2 by the CDMA radio unit 8 (“YES” in step S401), the PU 6 obtains the positioning enable bit from the received synchronization channel message, The positioning enable bit is determined (step S402).

Here, when the positioning possible bit is set to "0", the CPU 6 accesses the synchronization deviation management table shown in FIG. 8 prepared in the storage unit 14 (step S403), and the synchronization channel message. It is determined whether or not the fact that the synchronization is deviated in the base station 2 that has transmitted is transmitted (step S404). And the CPU 6
If it is not recorded that the base station 2 that has transmitted the synchronization channel message is out of synchronization ("NO" in step S404), the base station 2 that has transmitted the synchronization channel message is recorded as being out of synchronization. (Step S40
5).

Further, the CPU 6 determines that the positioning enable bit is "1".
If it is set to, the synchronization deviation management table is accessed (step S406), and it is determined whether or not the synchronization deviation is recorded in the base station 2 that has transmitted the synchronization channel message (step S407). In this case, if it is already recorded that the base station 2 that transmitted the synchronization channel message is out of synchronization (“YES” in step S407), the base station 2 that transmitted the synchronization channel message is out of synchronization. Record that you have not done so (step S
408). In this way, in the mobile phone 1, the C
The PU 6 can recognize with respect to each base station 2 whether or not the base station 2 is out of synchronization. As shown in the synchronization deviation management table, each base station 2 is distinguished from others by a unique PN (Pseudo Noise) number.

Now, in the mobile phone 1, the CPU 6
When searching for peripheral base stations 2 located in the vicinity of the communication base station 2, unlike the one described in the first embodiment, the following processing is performed. That is, the CPU 6
As shown in FIG. 9, the synchronization deviation management table is accessed (step S501), and it is determined whether or not the synchronization deviation is recorded in any of the peripheral base stations 2 (step S502). Then, the CPU 6 determines that the peripheral base station 2 is a base station 2 that can be used for positioning, if the fact that the synchronization is deviated is not recorded (“NO” in step S502) (step S503). On the other hand, if it is recorded that the synchronization is out of sync (“YES” in step S502), it is determined that the peripheral base station 2 is a base station 2 that cannot be used for positioning (step S502). S
504).

Then, the CPU 6 determines in this way whether or not it can be used for positioning with respect to all the peripheral base stations 2, and ends the determination with respect to all the peripheral base stations 2. Then (“YES” in step S505),
It is determined whether or not the peripheral base stations 2 that have been determined to be usable for positioning have reached a predetermined number of stations (step S50).
6). Note that the predetermined number of stations referred to here is the number of stations that allows the accuracy of the positioning result, and the mobile phone 1 automatically determines the optimum value by using the learning function, or the user requests it. It is decided according to the level of precision to be performed.

When the number of peripheral base stations 2 determined to be usable for positioning reaches the predetermined number of stations ("YES" in step S506), the CPU 6 determines that they can be used for the positioning. Search for peripheral base stations 2 and use CDM
The position information server 4 is caused to transmit the base station search result from the A radio unit 8 to the position information server 4, and thereafter to specify the position of the own terminal by using both the GPS satellite search result and the base station search result. (Step S507). In response to this, the position information server 4 identifies the position of the mobile phone 1 using both the GPS satellite search result and the base station search result.

On the other hand, when the CPU 6 determines that the number of peripheral base stations 2 determined to be usable for positioning has reached the predetermined number and does not exist (“N” in step S506).
O ”), the CDMA radio unit 8 does not transmit the base station search result to the position information server 4, and the GPS
The position information server 4 is instructed to specify the position of its own terminal using only the satellite search result (step S50).
8). In response to this, the position information server 4 specifies the position of the mobile phone 1 using only the GPS satellite search result. In this case, since the position information server 4 does not receive the base station search result in which the peripheral base station 2 is searched from the mobile phone 1, the approximate position of the mobile phone 1 based on the position of the communication base station 2 is received. Will be specified.

By such control, the mobile phone 1
If the number of peripheral base stations 2 that are not out of synchronization has not reached the predetermined number, the GPS satellites 5 are searched for thereafter,
Only the GPS satellite search result obtained by searching the GPS satellite 5 is transmitted to the position information server 4, and in response to this, the position information server 4 uses only the GPS satellite search result received from the mobile phone 1 Identify the position of.

Also in this second embodiment, when the number of the peripheral base stations 2 which are not out of synchronization with each other in the mobile phone 1 has not reached the predetermined number, the above-described first embodiment is described. Similarly to the above, if the search for the GPS satellites 5 is prohibited, the position information server 4 will be
By not receiving GPS satellite search results from
The position of the mobile phone 1 is forcibly stopped from being specified. Also, when the mobile phone 1 independently identifies the position of its own terminal, the same processing is performed, that is, the number of peripheral base stations 2 that are not out of synchronization has reached a predetermined number. Otherwise, after that, the position of the terminal itself is specified by using only the GPS satellite search result obtained by searching the GPS satellite 5.

As described above, according to the second embodiment, the mobile phone 1 receives and stores the synchronization deviation information indicating whether or not the base station 2 is out of synchronization from each base station 2. , The synchronization deviation information is determined for each peripheral base station 2, and if the number of peripheral base stations 2 that are not in synchronization has not reached the predetermined number, the base station search result in the position information server 4 is used. Since the position of the own terminal is prohibited from being specified, the number of stations that can allow the accuracy of the positioning result is set as the predetermined number of stations, so that the same as the one described in the first embodiment described above. After that, the position information server 4 does not specify the position of the mobile phone 1 by using the unreliable base station search result.
As a result, it is possible to avoid a situation in which the user has to wait a long time and only obtain a positioning result with low accuracy, and it is possible to improve convenience.

(Third Embodiment) Next, the third embodiment of the present invention will be described.
An example will be described with reference to FIG. The same parts as those of the second embodiment described above are designated by the same reference numerals and the description thereof is omitted. Hereinafter, different parts will be described.

In the second embodiment described above, the mobile phone 1 receives from the base station 2 a positioning enable bit (synchronization deviation information) indicating whether or not the base station 2 is out of synchronization. 2 is configured to determine that the two are out of synchronization. In contrast, in the third embodiment, the system time is acquired from each base station 2 in the mobile phone 1, and the GPS time and the base time are acquired. It is configured to determine that the base station 2 is out of synchronization by comparing with the system time held by the station 2.
The third embodiment is mainly described in claim 5 of the present invention.
It corresponds to claim 10, claim 13 and claim 17.

In the third embodiment, when the CPU 6 of the mobile phone 1 receives the synchronization channel message from the base station 2 by the CDMA radio unit 8 as shown in FIG. 10 ("YES" in step S601), From the received sync channel message, the system time (Fig.
Medium, SYS_TIME) is acquired (step S60
2) The difference between the GPS time and the system time held by the base station 2 is calculated, and the difference between the GPS time and the system time held by the base station 2 is compared with a predetermined value (step S).
603).

Here, if the difference between the GPS time and the system time held by the base station 2 exceeds a predetermined value ("YES" in step S603), the synchronization shift prepared in the storage unit 14 is performed. Access the management table (step S
604), the base station 2 that transmitted the synchronization channel message
It is determined whether or not the fact that the synchronization is deviated is already recorded (step S605). Then, the CPU 6 has not recorded the fact that the synchronization has been lost in the base station 2 which has transmitted the synchronization channel message (“N” in step S605).
O ”), and the fact that the synchronization is lost is recorded in the base station 2 that has transmitted the synchronization channel message (step S606).

Further, the CPU 6 controls the GPS time and the base station 2
If the difference from the system time held by the controller exceeds a predetermined value (“NO” in step S603), the synchronization deviation management table is accessed (step S607), and the base station 2 that transmitted the synchronization channel message is accessed. It is determined whether or not the fact that the synchronization is lost has been recorded (step S60).
8) In this case, if it is already recorded that the base station 2 that has transmitted the synchronization channel message is out of synchronization (“YES” in step S608), the base station 2 that has transmitted the synchronization channel message is notified. The fact that the synchronization is not lost is recorded (step S609). In this way, in the mobile phone 1, the CPU 6 can recognize with respect to each base station 2 whether or not the base station 2 is out of synchronization.

Then, in the mobile phone 1, the CPU 6
When searching for a peripheral base station 2 located in the vicinity of the communication base station 2, the peripheral base station that is determined to be usable for positioning by performing the same processing as that described in the second embodiment described above. When 2 has reached the predetermined number of stations and is present, the position information server 4 is instructed to specify the position of the own terminal by using both the GPS satellite search result and the base station search result. If the number of peripheral base stations 2 that have been determined to be available for use does not exist and has not reached the predetermined number, the position information server 4 is instructed to specify the position of the terminal itself using only the GPS satellite search result.

As described above, according to the third embodiment, in the mobile phone 1, the difference between the GPS time acquired from the GPS satellite 5 and the system time held by each base station 2 is a predetermined value. If it exceeds the above, the synchronization deviation information indicating that the base station 2 is out of synchronization is stored, the synchronization deviation information is judged for each peripheral base station 2, and the peripheral base stations 2 which are not in synchronization deviation are stored. If the number of stations in has not reached the predetermined number,
Since the position information server 4 is configured to prohibit the identification of the position of the own terminal using the base station search result, the accuracy of the positioning result can be allowed in the same manner as described in the second embodiment. By setting the number of stations as the predetermined number of stations, the position information server 4 will not use the unreliable base station search result to specify the position of the mobile phone 1 thereafter. It is possible to avoid a situation in which the user has to wait a long time and only obtain a positioning result with low accuracy, and it is possible to improve convenience.

(Other Embodiments) The present invention is not limited to the above embodiments, but can be modified or expanded as follows. The wireless communication terminal is not limited to a mobile phone, and may be another device such as a mobile information terminal having a communication function. The configuration may be such that the user can select whether to use only the GPS satellite result to specify the position of the mobile phone or to stop specifying the position of the mobile phone. The computer program executed by the CPU is not limited to the one stored from the beginning (for example, the stage of commercialization), but may be downloaded from a specific server through a network or a CD-ROM (Computer
It may be installed by being transferred from a recording medium such as an act disk-read only memory) or a card.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a processing flow of a first embodiment of the present invention.

FIG. 2 is a diagram schematically showing the overall configuration of the system.

FIG. 3 is a functional block diagram.

FIG. 4 is a view equivalent to FIG.

FIG. 5 shows a second embodiment of the present invention and is a flowchart showing processing on the base station side.

FIG. 6 is a flowchart showing processing on the mobile phone side.

FIG. 7: Sync Channel Message Format

FIG. 8 is a diagram schematically showing a synchronization deviation management table.

FIG. 9 is a view corresponding to FIG.

FIG. 10 shows a third embodiment of the present invention and is a flowchart showing processing on the mobile phone side.

[Explanation of symbols]

In the drawings, 1 is a mobile phone (wireless communication terminal), 2 is a base station, 4 is a position information server, 5 is a GPS satellite, and 6 is a CPU.
(Control means), 7 is a GPS radio section (GPS time acquisition means), 8 is a CDMA radio section (system time acquisition means, transmission means, synchronization deviation information receiving means), and 14 is a storage section (synchronization information storage means). is there.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshihiro Takeuchi             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Michio Shamoto             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Hiroyasu Ogino             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Takashi Oda             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO F term (reference) 5J062 AA08 AA13 BB05 CC07 DD21                       EE05                 5K067 AA33 BB04 DD20 DD25 DD30                       EE02 EE10 EE16 FF03 GG01                       GG11 JJ53 JJ56 KK13 KK15

Claims (17)

[Claims] 1. A GPS satellite search result or base received from a wireless communication terminal, configured to transmit a GPS satellite search result of GPS satellite search or a base station search result of peripheral base station search to a position information server. A wireless communication terminal for constructing a position specifying system together with a position information server configured to specify the position of the wireless communication terminal using a station search result, comprising: GPS time acquisition means for acquiring GPS time; A system time acquisition means for acquiring a system time held by the base station; and a control means for comparing the GPS time acquired by the GPS time acquisition means with the system time acquired by the system time acquisition means. When the difference between the GPS time and the system time exceeds a predetermined value, the control means controls the position information server. Wireless communication terminal, characterized in that to prohibit a particular location of the terminal itself using the Chikyoku search results. 2. The wireless communication terminal according to claim 1, wherein the control unit prohibits the transmission unit from transmitting the base station search result to the position information server, and thereby the base station search in the position information server. A wireless communication terminal, characterized in that it prohibits the identification of the position of the own terminal using the result. 3. The wireless communication terminal according to claim 1, wherein the control unit causes the transmission unit to transmit the base station search result to the position information server, and a signal indicating that the transmission unit is out of synchronization. Is transmitted to the location information server to prohibit the identification of the location of the own terminal using the base station search result in the location information server. 4. A GPS satellite search result or base received from a wireless communication terminal, which is configured to transmit a GPS satellite search result of GPS satellite search or a base station search result of peripheral base station search to a position information server. A wireless communication terminal that constructs a position identification system together with a position information server configured to specify the position of the wireless communication terminal using a station search result, wherein the base station is out of synchronization from each base station. Synchronization deviation information receiving means for receiving synchronization deviation information indicating whether or not there is synchronization deviation information storage means for storing synchronization deviation information received by the synchronization deviation information receiving means from each base station; and synchronization deviation information storage Means for determining synchronization deviation information stored in the means, the control means being stored in the synchronization deviation information storage means for a peripheral base station. Determining the out-of-sync information, and when the number of neighboring base stations that are not out-of-sync has not reached the predetermined number, prohibit the identification of the position of the own terminal using the base station search result in the position information server. A wireless communication terminal. 5. A GPS satellite search result or a base received from a wireless communication terminal, which is configured to transmit a GPS satellite search result of a GPS satellite search or a base station search result of a peripheral base station search to a position information server. A wireless communication terminal for constructing a position specifying system together with a position information server configured to specify the position of the wireless communication terminal using a station search result, comprising: GPS time acquisition means for acquiring GPS time; The system time acquisition means for acquiring the system time held by the base station, the synchronization deviation information storage means for storing the synchronization deviation information indicating whether or not each base station is out of synchronization, and the GPS time acquisition means. The acquired GPS time is compared with the system time acquired by the system time acquisition means and stored in the synchronization deviation information storage means. And a control unit that determines the synchronization deviation information that is present, the control unit is configured to synchronize the base station when there is a base station in which the difference between the GPS time and the system time exceeds a predetermined value. That the synchronization deviation information is stored in the synchronization deviation information storage means, the synchronization deviation information stored in the synchronization deviation information storage means is determined with respect to the peripheral base stations, and the number of peripheral base stations that are not in synchronization deviation is determined. A wireless communication terminal, characterized in that when a predetermined number of stations has not been reached, the position of the terminal itself is prohibited from being specified by using the base station search result in the position information server. 6. The wireless communication terminal according to claim 1, wherein the control means causes the transmission means to transmit a GPS satellite search result to the position information server, and thereby the GPS in the position information server. A wireless communication terminal characterized by permitting the identification of the position of the own terminal using a satellite search result. 7. The wireless communication terminal according to claim 1, and the position of the wireless communication terminal is specified by using a GPS satellite search result or a base station search result received from the wireless communication terminal. And a location information server for performing location identification. 8. A procedure for causing a wireless communication terminal to acquire GPS time, a procedure for acquiring system time held by a communication base station, a procedure for comparing GPS time and system time, GPS time and system A computer program for executing a procedure for prohibiting specification of the position of the own terminal using the search result of the base station in the position information server when it is determined that the difference from the time exceeds a predetermined value. 9. A procedure for causing a wireless communication terminal to receive synchronization deviation information indicating whether or not the base station is out of synchronization from each base station, and a procedure for storing the synchronization deviation information received from each base station. And a procedure for determining the synchronization deviation information stored in the peripheral base station, and the position information server when it is determined that the number of peripheral base stations that are not out of synchronization has not reached a predetermined number. And a procedure for prohibiting the specification of the position of the own terminal using the search result of the base station in. 10. A procedure for causing a wireless communication terminal to acquire GPS time, a procedure for acquiring system time held by each base station, a procedure for comparing GPS time and system time, GPS time and system When it is determined that there is a base station whose difference from the time exceeds a predetermined value, the procedure for storing that the base station is out of synchronization and the synchronization deviation stored in the surrounding base stations. Procedure for determining information, and when it is determined that the number of neighboring base stations that are not out of synchronization has not reached the predetermined number, specify the location of the terminal using the base station search result in the location information server Computer program for executing the procedure for prohibiting. 11. A wireless communication terminal configured to identify the position of its own terminal by using a GPS satellite search result of a GPS satellite search or a base station search result of a peripheral base station search, the GPS time GPS time acquisition means for acquiring, system time acquisition means for acquiring the system time held by the communication base station, GPS time acquired by the GPS time acquisition means, and system time acquisition means And a control unit that compares the system time with the control unit. The control unit prohibits the position of the own terminal using the search result of the base station when the difference between the GPS time and the system time exceeds a predetermined value. A wireless communication terminal characterized by the above. 12. A wireless communication terminal configured to identify the position of its own terminal by using a GPS satellite search result of a GPS satellite search or a base station search result of a peripheral base station search, wherein each base Synchronization deviation information receiving means for receiving synchronization deviation information indicating whether or not the base station is out of synchronization from a station, and synchronization deviation information storing synchronization deviation information received by the synchronization deviation information receiving means from each base station. An information storage unit and a control unit that determines the synchronization shift information stored in the synchronization shift information storage unit are provided, and the control unit is stored in the synchronization shift information storage unit with respect to a peripheral base station. When the synchronization deviation information is determined, and the number of peripheral base stations that are not out of synchronization does not reach the predetermined number, the position of the own terminal is prohibited using the base station search result. Wireless communication terminal that. 13. A wireless communication terminal configured to identify the position of its own terminal by using a GPS satellite search result of a GPS satellite search or a base station search result of a peripheral base station search, the GPS time GPS time acquisition means for acquiring the system time, system time acquisition means for acquiring the system time held by each base station, and synchronization deviation information storing synchronization deviation information indicating whether or not each base station is out of synchronization. The storage means compares the GPS time acquired by the GPS time acquisition means with the system time acquired by the system time acquisition means, and determines the synchronization deviation information stored in the synchronization deviation information storage means. When there is a base station in which the difference between the GPS time and the system time exceeds a predetermined value, the control means controls the same. The fact that there is a deviation is stored in the synchronization deviation information storage means, and the synchronization deviation information stored in the synchronization deviation information storage means is determined with respect to the peripheral base stations, and the peripheral base stations that are not out of synchronization are detected. A wireless communication terminal, characterized in that, when the number of stations has not reached a predetermined number, the location of the terminal itself is prohibited from being specified by using the base station search result. 14. The wireless communication terminal according to claim 11, wherein the control unit permits specification of a position of the own terminal using a GPS satellite search result. . 15. A procedure for causing a wireless communication terminal to acquire a GPS time, a procedure for acquiring a system time held by a communication base station, a procedure for comparing a GPS time system time, a GPS time and a system time. And a computer program for executing a procedure for prohibiting the identification of the position of the own terminal using the base station search result when it is determined that the difference between and the predetermined value exceeds a predetermined value. 16. A procedure for causing a wireless communication terminal to receive synchronization deviation information indicating whether or not the base station is out of synchronization from each base station, and a procedure for storing the synchronization deviation information received from each base station. And a procedure for determining the synchronization deviation information stored in the peripheral base stations, and a base station search when it is determined that the number of peripheral base stations that are not out of synchronization has not reached a predetermined number. A computer program for executing a procedure for prohibiting the identification of the position of the own terminal using the result. 17. A procedure for causing a wireless communication terminal to acquire GPS time, a procedure for acquiring system time held by each base station, a procedure for comparing GPS time and system time, GPS time and system When it is determined that there is a base station whose difference from the time exceeds a predetermined value, the procedure for storing that the base station is out of synchronization and the synchronization deviation stored in the surrounding base stations. Procedures for determining information and procedures for prohibiting the identification of the position of the own terminal using the base station search result when it is determined that the number of neighboring base stations that are not out of sync has not reached the prescribed number A computer program for executing and.