JP2005189173A - Assist data distribution method and control station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assist data distribution method and a control station enabling to distribute GPS assist data efficiently. <P>SOLUTION: The assist data distribution method to distribute GPS assist data to a communication terminal 10 through a UTRAN 10 from a positioning assist server 40 storing GPS assist data comprises a data collecting step in which the UTRAN 10 collects GPS assist data from the positioning assist server 40 at a certain timing, a collected data storing step in which the UTRAN 10 stores the GPS assist data into a data storage part 106, a request receiving step in which the UTRAN 10 receives a positioning request of a certain communication terminal 201, and the UTRAN 10 sends the GPS assist data stored in the data storage part 106 to the certain communication terminal 201. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an assist data distribution method used at the time of GPS positioning calculation, and a control station.

  Positioning technology using GPS (Global Positioning System) is used for positioning various objects such as ships and vehicles. In particular, in recent years, it has begun to be widely applied in positioning of communication terminals such as mobile phones. As a method for speeding up the positioning calculation in such a communication terminal, a method of using GPS assist data including satellite orbit information provided from a GPS satellite is employed.

A conventional method of receiving GPS assist data is disclosed, for example, in Patent Document 1 below. In this receiving method, the communication terminal directly requests the GPS assist data from the positioning assist server that stores the GPS assist data. Thereafter, GPS assist data is transmitted from the positioning assist server to the requesting communication terminal.
JP 2002-221563 A

  However, in the GPS assist data receiving method described above, the communication terminal needs to receive GPS assist data from the positioning assist server at a certain frequency in order to shorten the time required for the positioning calculation. As a result, the GPS assist data is transmitted in parallel to each communication terminal, resulting in an increase in communication traffic and a large processing load on the positioning assist server.

  Therefore, the present invention has been made in view of such problems, and an object thereof is to provide an assist data distribution method and a control station that can improve the efficiency of GPS assist data distribution.

  In order to solve the above-described problem, the assist data distribution method of the present invention provides GPS assist data to a communication terminal via a control station from a positioning assist server that stores GPS assist data used for positioning calculation related to the communication terminal. An assist data distribution method for distributing, wherein the control station collects GPS assist data from the positioning assist server at a predetermined timing, and the control station is provided with the collected GPS assist data in the control station. The collected data storage step stored in the data storage means, the control station receives a positioning request for requesting positioning for a specific communication terminal, and the control station collects according to the received positioning request. The GPS data stored in the data storage means provided in the control station in the data storage step. Strike data, characterized in that it comprises a data transmission step of transmitting a specific communication terminal.

  In addition, the control station of the present invention includes a data collection unit that collects GPS assist data at a predetermined timing from a positioning assist server that stores GPS assist data used for positioning calculation related to a communication terminal, and the collected GPS assist. Data storage means for storing data; request receiving means for receiving a positioning request for requesting positioning for a specific communication terminal; and GPS assist data stored in the data storage means in response to the received positioning request. And data transmission means for transmitting to a specific communication terminal.

  According to such an assist data distribution method and control station, the control station receives a positioning request, and after collecting GPS assist data from the positioning assist server at a predetermined timing, stores data in a memory or the like in the control station. Store in the means. Further, the control station transmits the GPS assist data stored in the data storage means to the positioning target communication terminal in response to the positioning request. Thereby, the GPS assist data buffered in the control station at the time of the positioning request regarding the communication terminal is transmitted to the communication terminal, and the communication traffic between the control station and the positioning assist server is effectively reduced.

  Further, the predetermined timing is preferably when a predetermined time interval elapses from the previous collection time. In this case, distribution of communication traffic between the control station and the positioning assist server can be easily realized.

  Furthermore, it is also preferable that the predetermined timing is a time after a predetermined time interval has elapsed from the previous collection time and when the control station first receives the positioning request. By collecting at this timing, communication traffic between the control station and the positioning assist server is distributed, and communication traffic can be minimized when there are few positioning requests such as late at night. .

  Furthermore, it is preferable that the time interval is determined for each element data constituting the GPS assist data. In this way, a time interval corresponding to the data expiration date is set for each element data, and the element data can be divided and collected according to the time interval, so communication between the control station and the positioning assist server Traffic is further reduced.

  According to the assist data distribution method of the present invention, the control station receives the positioning request, and collects GPS assist data from the positioning assist server at a predetermined timing and then stores it in a data storage means such as a memory in the control station. To do. Further, the control station transmits the GPS assist data stored in the data storage means to the positioning target communication terminal in response to the positioning request. Thereby, the GPS assist data buffered in the control station at the time of the positioning request regarding the communication terminal is transmitted to the communication terminal, and the communication traffic between the control station and the positioning assist server is effectively reduced. Therefore, it is possible to provide an assist data distribution method capable of improving the efficiency of GPS assist data distribution, which is an object of the present invention.

  Embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

[First Embodiment]
First, the configuration of the assist data distribution system according to the first embodiment of the present invention will be described. FIG. 1 is a schematic configuration diagram of an assist data distribution system 1 showing a first embodiment of the present invention. As shown in FIG. 1, the assist data distribution system 1 according to the present embodiment includes a UTRAN (control station) 10, communication terminals 201 and 202, a positioning assist server 40, a mobile communication network 50, and a wide area network 51. It is comprised including. The assist data distribution system 1 is a computer system for distributing GPS assist data to the communication terminal 201 via the UTRAN 10 from the positioning assist server 40 that stores GPS assist data used for positioning calculation regarding the communication terminal. . Hereinafter, each component will be described in detail.

  The communication terminal 201 is a mobile phone having a voice call function and a data communication function. Further, the communication terminal 201 is configured to be able to perform a positioning calculation regarding its own position using GPS assist data. Here, “GPS assist data” is data used when performing positioning calculation by GPS, for example, correction information such as GPS satellite orbit information, and is used to shorten the positioning calculation time. Data. The communication terminal 201 employs the Assisted-GPS method as a positioning calculation method, and performs positioning calculation by capturing a signal coming from a GPS satellite using GPS assist data. The communication terminal 201 transmits and receives data to and from the UTRAN 10, the positioning assist server 40, and the communication terminal 202 via the mobile communication network 50.

  Similarly, the communication terminal 202 has a voice call function and a data communication function, and is a mobile phone used by a user who wants to request positioning from the communication terminal 201. The communication terminal 202 transmits and receives data between the UTRAN 10 and the communication terminal 201 via the mobile communication network 50. In addition, the communication terminal 202 has a function of transmitting a positioning request signal (positioning request) that requests the UTRAN 10 to perform positioning related to the communication terminal 201.

  The positioning assist server 40 is a computer system that stores GPS assist data acquired from GPS satellites, and includes a data transmission unit 401 and an assist data storage unit 402 as functional components. The positioning assist server 40 is configured to be able to send and receive data to and from the UTRAN 10 via the wide area network 51. The assist data storage unit 402 stores the latest GPS assist data sequentially broadcast from GPS satellites. The GPS assist data stored in the assist data storage unit 402 is composed of a plurality of element data acquired via a GPS reference station that constantly receives radio waves from GPS satellites (details will be described later). ). Further, the data transmission unit 401 transmits the GPS assist data stored in the assist data storage unit 402 to the UTRAN 10 in response to a request from the UTRAN 10.

  The UTRAN 10 is a communication facility that controls communication in a plurality of radio base stations (not shown) in the mobile communication network 50 and transmits GPS assist data collected from the positioning assist server 40 to the communication terminal 201. The UTRAN 10 is for controlling the radio base station that places the communication terminal 201 in the communication area, but the mobile communication network 50 includes a plurality of other control stations (not shown). The UTRAN 10 includes, as functional components, a collection control unit 101, a data collection unit (data collection unit) 102, a request reception unit (request reception unit) 103, a data transmission unit (data transmission unit) 104, data A storage unit (data storage unit) 106 and a period information storage unit 107 are provided. Subsequently, each component of the UTRAN 10 will be described in detail.

The collection control unit 101 is a part that controls the data collection unit 102 so as to periodically collect GPS assist data from the positioning assist server 40. Specifically, the collection control unit 101 sends a trigger signal to the data collection unit 102 when the period T _{0 has} elapsed from the previous collection time of GPS assist data. An appropriate value is set as the value of T ₀ in accordance with the frequency of positioning calculation, the data update frequency in the positioning assist server 40, and the like.

  The data collection unit 102 is a part that collects GPS assist data from the positioning assist server 40 at a predetermined timing based on control by the collection control unit 101. This predetermined timing is determined for each element data constituting the GPS assist data. Here, the “element data” is an element constituting the GPS assist data, and is data classified for each data type.

Table 1 shows a relationship between a specific example of element data stored in the assist data storage unit 402 of the positioning assist server 40 and an update period of element data in the assist data storage unit 402.

  As shown in Table 1, the GPS assist data in the assist data storage unit 402 is updated at different update cycles for each data type. For example, the update cycle for the data type “GPS Reference Time” is “minimal”, indicating that GPS assist data belonging to this data type is constantly updated data. Note that the update cycle “irregular (anytime)” means that the update is made at any time according to a change in the state of the GPS satellite, a change in the radio wave propagation environment, or the like.

  Returning to FIG. 1, the data collection unit 102 specifies element data to be collected in accordance with a time interval determined for each element data corresponding to such an update cycle. Information regarding this time interval is stored in advance in the cycle information storage unit 107. FIG. 2 shows an example of a configuration diagram of data stored in the period information storage unit 107. According to the example shown in FIG. 2, the element data name “GPS Reference Time” and the data of the time interval information “15 sec” related to the element data are stored in association with each other. The time interval information is determined in advance in consideration of the update period in the assist data storage unit 402 and the necessity at the time of positioning calculation. For example, in the element data “GPS Real Time Integrity”, the time interval information is set to “15 sec” because the update cycle is irregular but is essential for the positioning calculation. In addition, since the element data “Almanac and Satellite Health” is data that is updated less frequently than the other element data, the time interval information is set to “7200 sec”. Therefore, the data collection unit 102 determines whether or not the reception time of the trigger signal from the collection control unit 101 is a time interval that is predetermined for each element data from the previous collection time of each element data. . Then, the data collection unit 102 specifies element data whose trigger signal reception time is when a predetermined time interval has elapsed from the previous collection time. In this way, the trigger signal reception time is determined as the collection timing (predetermined timing) of the identified element data. Further, the data collection unit 102 generates information for specifying the collection target element data as the collection target specifying data.

Hereinafter, with reference to the example shown in FIG. 2, a method for specifying element data that is a collection target when the GPS assist data collection period T ₀ = 15 sec will be described in more detail.

  First, the data collection unit 102 has an integer value counter with an initial value of 0, and adds 1 to the counter every time a trigger signal is received from the collection control unit 101. If the counter value after addition is less than 1800 sec / 15 sec = 120, element data group 1 “GPS Reference Time” and “GPS Real Time Integrity” are specified as data to be collected. In addition, when the counter value is 120, as the data to be collected, the element data group 2 “GPS Reference Time”, “GPS Real Time Integrity”, “GPS Navigation Model”, “Ionospheric Model”, “DGPS Corrections”, and “GPS Specify "UTC Model". After the counter value exceeds 120, until it reaches 7200 sec / 15 sec = 480, element data group 2 is specified when the counter value is a multiple of 120, and element data group 1 is specified otherwise. Furthermore, when the counter reaches 480, the element data groups 3 “GPS Reference Time”, “GPS Real Time Integrity”, “GPS Navigation Model”, “Ionospheric Model”, “DGPS Corrections”, “GPS UTC” are collected as data to be collected. Identify “Model” and “Almanac and Satellite Health”. That is, the element data group 3 is specified when the counter value is a multiple of 480. In this way, the element data to be collected is specified so that each element data is collected at each time interval.

  In this way, the data collection unit 102 specifies a collection target after detecting the trigger signal from the collection control unit 101, and then sends a request signal for requesting the positioning assist server 40 to transmit GPS assist data. Send. Further, the data collection unit 102 transmits collection target specifying data indicating requested element data in accordance with the request signal. On the other hand, when the request signal and the collection target specifying data are received in the data transmission unit 401 of the positioning assist server 40, the positioning target server 40 specifies the collection target specifying data with respect to the data collection unit 102. Element data to be transmitted. Then, after receiving the element data from the positioning assist server 40, the data collection unit 102 stores all the collected element data in the data storage unit 106 provided in the UTRAN 10.

  The request receiving unit 103 is a part that receives a positioning request signal for requesting positioning regarding the communication terminal 201 that is a specific communication terminal from the communication terminal 202. When receiving the positioning request signal, the request receiving unit 103 outputs the positioning request signal to the data transmitting unit 104.

  The data transmission unit 104 is a part that transmits GPS assist data stored in the data storage unit 106 provided in the UTRAN 10 to the communication terminal 201 in response to the positioning request received by the request reception unit 103. The data transmission unit 104 reads the GPS assist data of all the element data from the data storage unit 106 and then transmits the GPS assist data to the communication terminal 201 via the mobile communication network 50.

  Subsequently, an operation of the assist data distribution system 1 according to the present embodiment will be described, and an assist data distribution method according to the embodiment of the present invention will be described. FIG. 3 is a sequence diagram showing the operation of the assist data distribution system 1 according to the present embodiment.

First, the collection control unit 101 of the UTRAN10 is the period _{T 0} controls the data acquisition unit 102 to periodically collect GPS assist data (step S01). Next, the data collection unit 102 in the UTRAN 10 includes the element when the timing divided by the collection control unit 101 at the period T ₀ is when a predetermined time interval has elapsed from the previous collection time of each element data. Data is specified as element data to be collected (step S02). Thereafter, the data collection unit 102 transmits a request signal and collection target specifying data to the positioning assist server 40 (step S03). In response to this, the data transmission unit 401 of the positioning assist server 40 transmits the GPS assist data of the element data specified by the collection target specifying data to the UTRAN 10 (step S04). The transmitted GPS assist data is received by the data collection unit 102 and stored in the data storage unit 106 (step S05).

The processes from step S01 to step S05 described above are repeated as follows. That is, the collection control unit 101 of the UTRAN 10 sends a trigger signal to the data collection unit 102 after a period T _{0 has} elapsed from the previous GPS assist data reception time (step S06). Then, the data collection unit 102 specifies element data to be collected at the next request signal transmission using the trigger signal reception time (step S07). Next, the data collection unit 102 transmits a request signal and collection target specifying data to the positioning assist server 40 (step S08). Thereafter, processing similar to steps S04 and S05 is performed.

  In parallel with the collection of such GPS assist data, a positioning request signal is transmitted to the UTRAN 10 by the communication terminal 202, and the request receiving unit 103 of the UTRAN 10 receives the positioning request signal (step S09). In response to the received positioning request signal, the data transmission unit 104 reads the latest GPS assist data stored in the data storage unit 106 (step S10). Then, the data transmission unit 104 transmits the positioning request signal and the read GPS assist data to the communication terminal 201 (step S11). In response to this, the communication terminal 201 performs a positioning calculation using the received GPS assist data (step S12). Finally, positioning calculation result data is transmitted from the communication terminal 201 to the communication terminal 202 (step S13).

Next, the assist data distribution image in the assist data distribution system 1 will be described with reference to FIG. FIG. 4 is a sequence diagram showing a data flow in the assist data distribution system 1. In FIG. 4, a solid line arrow indicates a data flow in the assist data distribution system 1, and a dotted line arrow indicates a data flow according to the related art. As described above, in the assist data distribution system 1, the positioning request signal is transmitted from the communication terminal 202 in parallel with the periodic transmission of the GPS assist data from the positioning assist server 40 to the UTRAN 10. After receiving the positioning request signal, the UTRAN 10 immediately transmits GPS assist data to the communication terminal 201 in accordance with the positioning request signal. On the other hand, after receiving a positioning request signal from the communication terminal 202, the conventional UTRAN requests GPS assist data from the positioning assist server 40 in response to the positioning request. Thereafter, the GPS assist data is received and transferred to the communication terminal 201. Therefore, in the assist data distribution method in the UTRAN 10, the transmission time of the positioning request signal from the communication terminal 202 to the communication terminal 201 is shortened by the GPS assist data collection time T ₁ between the UTRAN 10 and the positioning assist server 40. Result.

  According to the assist data distribution method according to the first embodiment described above, the UTRAN 10 receives a positioning request, and after collecting GPS assist data from the positioning assist server 40 at a predetermined timing, the memory in the UTRAN 10 or the like. Is stored in the data storage unit 106. Further, the UTRAN 10 transmits the GPS assist data stored in the data storage unit 106 to the positioning target communication terminal 201 in response to the positioning request. Thereby, the GPS assist data buffered by the UTRAN 10 at the time of the positioning request regarding the communication terminal 201 is transmitted to the communication terminal 201, and the communication traffic between the UTRAN 10 and the positioning assist server 40 is effectively reduced. Furthermore, since the data communication partner viewed from the positioning assist server 40 is only the UTRAN 10, the processing load on the positioning assist server 40 is reduced.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. FIG. 5 is a schematic configuration diagram of the assist data distribution system 2 showing the second embodiment of the present invention. Hereinafter, the difference between the components of the assist data distribution system 2 according to the present embodiment and the first embodiment will be described in detail.

  The request receiving unit 123 of the UTRAN 12 receives a positioning request signal related to the communication terminal 201 from the communication terminal 202, and outputs the received positioning request signal to the data transmission unit 104 and the collection control unit 121.

  The collection control unit 121 of the UTRAN 12 has a predetermined timing after the elapse of a predetermined time interval for each element data from the previous collection time of each element data and the time when the UTRAN 12 first receives the positioning request signal. Control is performed so as to collect the element data.

  Specifically, the collection control unit 121 identifies the element data to be collected according to the time interval stored in the period information storage unit 127. FIG. 6 shows an example of a configuration diagram of data stored in the period information storage unit 127. As shown in FIG. 6, in the period information storage unit 127, in addition to the time interval information corresponding to each element data, information related to the previous collection time of the data element is stored in association with each other. The information regarding the collection time is data stored as the reception time when the data collection unit 122 receives the element data.

  Therefore, the collection control unit 121 identifies element data whose current time is a time when a predetermined time interval has elapsed for each element data from the previous collection time of each element data. According to the example of FIG. 6, with reference to the period information storage unit 127, the time interval information “7200 [sec]” corresponding to the element data “Almanac and Satellite Health” and the previous collection time “2003/11/10 08” : 10: 15 "is read out. Similarly, the collection control unit 121 reads the previous collection time and time interval information of all element data. Thereafter, the collection control unit 121 determines, for each element data, whether or not the current time is a time obtained by adding a time interval to the previous collection time. As a result of the determination, element data whose current time is a time obtained by adding a time interval to the previous collection time is specified as element data to be collected. For example, when the current time is “2003/11/10 10:10:15”, the element data “Almanac and Satellite Health” is specified as the element data to be collected.

  Then, the collection control unit 121 generates the collection target specifying data for specifying the element data to be collected, and then transmits the collection target specifying data to the data collection unit at the time when the request receiving unit 123 first receives the positioning request signal. It outputs to 122.

  The data collection unit 122 collects element data specified by the collection target specifying data from the positioning assist server 40 at the timing when the collection target specifying data is output from the collection control unit 121. The element data is collected by transmitting a request signal and collection target specifying data to the positioning assist server 40.

  Next, the operation of the assist data distribution system according to the second embodiment will be described. FIG. 7 is a sequence diagram showing the operation of the assist data distribution system 2 according to the second embodiment.

  First, when the UTRAN 12 is activated, the collection control unit 121 identifies all element data as element data to be collected (step S21). Thereafter, when a positioning request signal is transmitted from the communication terminal 202 to the UTRAN 12, the request receiving unit 123 of the UTRAN 12 receives the positioning request signal (step S22). Under the control of the collection control unit 121, the data collection unit 122 transmits a request signal and collection target specifying data for specifying all element data to the positioning assist server 40 (step S23). On the other hand, all the element data are transmitted to the UTRAN 12 by the data transmission unit 401 of the positioning assist server 40 (step S24).

  After the data collection unit 122 receives the GPS assist data, the data collection unit 122 stores the GPS assist data in the data storage unit 106 and updates the information on the previous collection time in the cycle information storage unit 127 (step S25). Then, the data transmission unit 104 transmits the GPS assist data and the positioning request signal stored in the data storage unit 106 to the communication terminal 201 (step S26). In response to this, the communication terminal 201 performs a positioning calculation using the received GPS assist data (step S27). The positioning calculation result data is transmitted from the communication terminal 201 to the communication terminal 202 that is the request source (step S28).

  Thereafter, the collection control unit 121 determines, for each element data, whether or not the current time is an elapse of a predetermined time interval from the previous collection time (step S29). Then, the collection control unit 121 identifies the element data whose current time is a predetermined time interval from the previous collection time as the element data to be collected (step S30). Thereafter, a positioning request signal is transmitted from the communication terminal 202 to the UTRAN 12 (step S31). In response to this, the data collection unit 122 transmits a request signal and collection target specifying data to the positioning assist server 40 (step S32).

  As a result, the element data specified by the collection target specifying data is transmitted to the UTRAN 12 by the positioning assist server 40 (step S33). When the data collection unit 122 of the UTRAN 12 receives the element data, the data collection unit 122 stores the element data in the data storage unit 106 and updates information on the previous collection time of the element data in the cycle information storage unit 127 (step S34). Thereafter, in exactly the same manner as in steps S26 to S28, after the positioning calculation is performed in the communication terminal 201, the data of the positioning calculation result is transmitted to the communication terminal 202 (step S35 to step S37).

Next, the assist data distribution image in the assist data distribution system 2 will be described with reference to FIG. FIG. 8 is a sequence diagram showing the flow of data in the assist data distribution system 2. In FIG. 8, a solid line arrow indicates a data flow in the assist data distribution system 2, and a dotted line arrow indicates a data flow according to the related art. Thus, in the assist data distribution system 2, the UTRAN 12 collects GPS assist data from the positioning assist server 40 when transmitting a positioning request signal from the communication terminal 202 to the UTRAN 12. However, before the predetermined time interval T ₂ has elapsed from the previous collection time of the GPS assist data, the UTRAN 12 does not collect the GPS assist data and is stored in the positioning request signal and data storage unit 106 in the communication terminal 201. Operates to transmit GPS assist data. On the other hand, after receiving a positioning request signal from the communication terminal 202, the conventional UTRAN requests GPS assist data from the positioning assist server 40 in response to the positioning request. Thereafter, the GPS assist data is received and transferred to the communication terminal 201. Therefore, in the assist data distribution method in the UTRAN 10, the transmission time of the positioning request signal from the communication terminal 202 to the communication terminal 201 is shortened by the GPS assist data collection time T ₁ between the UTRAN 12 and the positioning assist server 40. Result.

  Even with the assist data delivery method according to the second embodiment described above, the UTRAN 12 receives a positioning request, while collecting GPS assist data from the positioning assist server 40 at a predetermined timing, and then the memory in the UTRAN 12 and the like. The data is stored in the data storage unit 106. Further, the UTRAN 12 transmits the GPS assist data stored in the data storage unit 106 to the positioning target communication terminal 201 in response to the positioning request. Thereby, the GPS assist data buffered by the UTRAN 12 at the time of the positioning request regarding the communication terminal 201 is transmitted to the communication terminal 201, and the communication traffic between the UTRAN 12 and the positioning assist server 40 is effectively reduced. Furthermore, since the data communication partner viewed from the positioning assist server 40 is only the UTRAN 12, the processing load on the positioning assist server 40 is reduced. In addition, the amount of information flowing through the network can be minimized when there are few positioning requests, such as late at night.

  The present invention is not limited to the above-described embodiment. For example, in the assist data distribution systems 1 and 2 according to the present embodiment, the communication terminal 202 transmits a positioning request signal to the UTRANs 10 and 12. However, this may be configured such that a positioning request signal is transmitted from another information device such as an ASP (Application Service Provider), a server installed in a company, or a personal computer. Further, the communication terminal 201 may be configured to be able to transmit a positioning request signal for requesting its own positioning.

  Further, in the assist data distribution system 2 according to the present embodiment, whether or not all element data is to be collected is determined separately, and operates to receive each element data at a predetermined timing. However, this may operate so as to determine for each element data group in which a plurality of element data is combined.

It is a schematic block diagram of the assist data delivery system which shows 1st Embodiment of this invention. It is an example of the block diagram of the data stored in the period information storage part of FIG. It is a sequence diagram which shows operation | movement of the assist data delivery system concerning 1st Embodiment. It is a sequence diagram which shows the flow of the data in the assist data delivery system concerning 1st Embodiment. It is a schematic block diagram of the assist data delivery system which shows 2nd Embodiment of this invention. It is an example of the block diagram of the data stored in the period information storage part of FIG. It is a sequence diagram which shows operation | movement of the assist data delivery system concerning 2nd Embodiment. It is a sequence diagram which shows the flow of the data in the assist data delivery system concerning 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2 ... Assist data delivery system 101, 121 ... Collection control part, 102, 122 ... Data collection part, 103, 123 ... Request reception part, 104 ... Data transmission part, 106 ... Data storage part, 107, 127 ... Period Information storage unit, 201, 202 ... communication terminal, 40 ... positioning assist server, 401 ... data transmission unit, 402 ... assist data storage unit, 50 ... mobile communication network, 51 ... wide area network.

Claims (5)

An assist data distribution method for distributing the GPS assist data to a communication terminal via a control station from a positioning assist server that stores GPS assist data used for positioning calculation related to a communication terminal,
A data collection step in which the control station collects the GPS assist data from the positioning assist server at a predetermined timing;
A collected data storage step in which the control station stores the collected GPS assist data in a data storage means provided in the control station;
A request receiving step for receiving a positioning request for requesting positioning for a specific communication terminal by the control station;
Data transmission in which the control station transmits GPS assist data stored in the data storage means provided in the control station by the collected data storage step to the specific communication terminal in response to the received positioning request. Steps,
An assist data delivery method comprising: The predetermined timing is when a predetermined time interval elapses from the previous collection time.
The assist data distribution method according to claim 1, wherein: The predetermined timing is a time when the control station first receives the positioning request after a predetermined time interval has elapsed from the previous collection time.
The assist data distribution method according to claim 1, wherein: The time interval is determined for each element data constituting the GPS assist data.
4. The assist data delivery method according to claim 2, wherein the assist data delivery method is provided. Data collection means for collecting the GPS assist data at a predetermined timing from a positioning assist server that stores GPS assist data used for positioning calculation related to a communication terminal;
Data storage means for storing the collected GPS assist data;
Request receiving means for receiving a positioning request for requesting positioning for a specific communication terminal;
Data transmission means for transmitting GPS assist data stored in the data storage means to the specific communication terminal in response to the received positioning request;
A control station comprising:

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