KR102272429B1 - Apparatus and method for providing GPS correcting information, and mobile communication terminal - Google Patents

Abstract

An apparatus and method for providing GPS correction information, and a mobile communication terminal are disclosed. An apparatus according to an aspect includes: a storage unit for storing type information of GPS correction information for each base station; a receiver for receiving GPS correction information from the correction information generating server; a query unit for inquiring from the storage unit the first base station corresponding to the type of the received GPS correction information; and a transmitter for transmitting a broadcasting request including the received GPS correction information to the first base station queried by the inquiry unit.

Description

Apparatus and method for providing GPS correcting information, and mobile communication terminal

The present invention relates to a GPS correction technology, and more particularly, to an apparatus and method for providing GPS correction information suitable for the performance of a GPS receiver of a mobile communication terminal in a mobile communication network, and to a mobile communication terminal.

In a conventional mobile communication network, GPS (Global Positioning System) correction information is transmitted by unicast transmission between a correction information generating server and a GPS-function mobile communication terminal. Here, when the number of mobile communication terminals increases, it is necessary to expand the correction information generating server and manage the load of the mobile communication network to manage the connection of the increased mobile communication terminals.

In order to solve this conventional problem, a PPP-RTK technology combining a Precise Point Positioning (PPP) method and a Real Time Kinematic (RTK) method has already been utilized in several countries. In the PPP-RTK method, error correction information of a small data size divided through modeling in the correction information generation server is used. Unlike the conventional method, the correction information generating server does not need to receive information from the mobile communication terminal through the uplink, so it can transmit the correction information to the mobile communication terminals through the broadcasting method.

In particular, when broadcasting GPS correction information through a mobile communication network, a method utilizing a System Information Block (SIB) of a Cell Broadcasting Service (CBS) may be used.

However, the type of GPS correction information that can be utilized in the mobile communication terminal is different according to the performance of the GPS receiver of the mobile communication terminal. That is, when the performance of the GPS receiver is a code scheme of the L1 frequency, when a carrier phase of the L1 frequency is used, when both the L1 and L2 frequencies are used, the type of GPS correction information required varies.

In addition, in the broadcasting method of the mobile communication network using the SIB, it is impossible to transmit the entire correction information including the GPS correction information for each type due to the disadvantage that the message size of the SIB is small. In addition, GPS correction information for each type can be sequentially transmitted to the SIB. Then, too frequent message transmission occurs, making it difficult for all connected mobile communication terminals to switch to a sleep mode to save batteries. This happens.

US registered patent US 6,968,371 (2005.11.22)

The present invention was created in recognition of the prior art as described above, and matches the type of GPS correction information according to the frequency allocated to each base station of a mobile communication network and broadcasts the GPS correction information of the type matched to the base station through each base station. An object of the present invention is to provide an apparatus and method for providing a mobile communication terminal, and a mobile communication terminal.

Another object of the present invention is to switch reception of broadcasting to a neighboring base station so that the mobile communication terminal receives GPS correction information suitable for the type when the type of GPS correction information received from the base station does not match the type of the GPS receiver. have.

In addition, an object of the present invention is to determine whether an overload occurs in a base station, and broadcast GPS correction information of a type matched to the first base station by an adjacent second base station on behalf of the first base station in which the overload occurs.

According to one aspect, an apparatus for broadcasting GPS correction information to a mobile communication terminal through a base station includes: a storage unit for storing type information of GPS correction information for each base station; a receiver for receiving GPS correction information from the correction information generating server; an inquiry unit for inquiring from the storage unit a first base station corresponding to the type of the received GPS correction information; and a transmitter for transmitting a broadcasting request including the received GPS correction information to the first base station queried by the inquiry unit.

The inquiry unit queries the storage unit for type information of the GPS correction information of the neighboring base station of the first base station, and the transmitter includes the type information of the GPS correction information of the neighboring base station in the broadcasting request.

The apparatus includes: a collecting unit for collecting situation information for each base station; and a determining unit configured to replace the first base station based on the situation information for each base station, determine a second base station to broadcast the received GPS correction information, and generate control information related to the replacement determination, The transmitter includes the generated control information in the broadcasting request.

The situation information is load information.

The determining unit determines a second base station having a lower load than the first base station based on the load information for each base station.

The determination unit determines, based on the load information for each base station, a second base station having a lower load than the first base station and corresponding to the type of the received GPS correction information.

The situation information is disaster broadcasting information.

The determining unit determines a second base station that does not transmit the disaster broadcast.

The determination unit determines the second base station corresponding to the received type of GPS correction information without transmitting the emergency broadcast.

The determination unit generates the control information including a broadcasting end time of the GPS correction information of the first base station, a broadcasting start time of the GPS correction information of the second base station, and access information of the second base station.

In addition, the mobile communication terminal for receiving the GPS correction information, a GPS receiver for receiving a GPS signal; a receiver for receiving a broadcasting message including GPS correction information from a base station; a determination unit that compares the received type information of the GPS correction information and the type information of the GPS receiver to determine whether the information matches; and a correction unit for correcting the position measured based on the GPS signal by using the GPS correction information when the determination result is the same.

The mobile communication terminal further includes a switching unit for switching to another base station having type information matching the type information of the GPS receiver when the determination result does not match.

When the broadcasting message includes control information for switching broadcasting of the GPS correction information, the switching unit switches the base station to receive the GPS correction information to another base station with reference to the control information.

The control information includes a broadcasting end time of GPS correction information of a currently accessed base station, a broadcasting start time of GPS correction information of another base station, and access information of the other base station.

According to another aspect, a method for an apparatus to broadcast information to a mobile communication terminal through a base station includes: storing type information of GPS correction information for each base station; receiving GPS correction information from a correction information generating server; inquiring a first base station corresponding to the type of the received GPS correction information from among the base stations for each of the stored type information; and transmitting a broadcasting request including the received GPS correction information to the inquired first base station.

In addition, a method for a mobile communication terminal to receive GPS correction information includes: receiving a GPS signal; Receiving a broadcasting message including GPS correction information from a base station; comparing the received type information of the GPS correction information with the type information of the GPS receiver to determine whether they match; and correcting the position measured based on the GPS signal by using the GPS correction information when the determination result is the same.

According to one aspect of the present invention, the apparatus matches the types of GPS correction information corresponding to each frequency for each base station, and broadcasts each type of GPS correction information to the mobile communication terminal through the corresponding base station, so that the mobile communication terminal matches It is possible to receive GPS correction information of the same type through the SIB of a limited size and accurately correct the GPS information with the stably received GPS correction information while minimizing battery consumption.

According to another aspect of the present invention, in the mobile communication terminal, if the type of GPS correction information included in the SIB received from the base station of the primary cell (P cell) being accessed does not match the type of the GPS receiver, the matched type is matched By switching to receive SIB from a neighboring base station, it is possible to receive stable GPS correction information.

According to another aspect of the present invention, the mobile communication terminal receives control information from the current base station receiving GPS correction information, and switches to receive GPS correction information from a neighboring base station, thereby reducing the load on the current base station. have.

The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention, so that the present invention is described in such drawings. should not be construed as limited to
1 is a schematic configuration diagram of a system for providing GPS correction information according to first and second embodiments of the present invention.
FIG. 2 is a schematic internal configuration diagram of the broadcasting server of FIG. 1 .
FIG. 3 is a schematic internal configuration diagram of the mobile communication terminal of FIG. 1 .
4 is a flowchart of signal processing for receiving and converting type information of GPS correction information of another base station according to the first embodiment of the present invention.
5 is a flowchart of signal processing for scanning and converting type information of GPS correction information of another base station according to the second embodiment of the present invention.
6 is a schematic internal configuration diagram of a broadcasting server for controlling overload of a base station according to a third embodiment of the present invention.
7 is a flowchart of signal processing for controlling overload of a base station according to a third embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention. Accordingly, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all of the technical idea of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.

1 is a schematic configuration diagram of a system 100 for providing GPS correction information according to an embodiment of the present invention.

The system 100 according to an embodiment of the present invention includes a correction information generating server 110 for generating GPS correction information, a broadcasting server 130 receiving the generated GPS correction information from the correction information generating server 110, Includes base stations 151 and 153 that receive and broadcast GPS correction information from the broadcasting server 130, and mobile communication terminals 171 and 173 that connect to base stations 151 and 153 and receive broadcasting and transmission of GPS correction information is composed by

The correction information generating server 110 generates GPS correction information for each type according to the characteristics of the GPS location information, and transmits the generated GPS correction information for each type to the broadcasting server 130 .

For reference, there are GPS, Galileo, GLONASS, etc. depending on the type of the GNSS (Global Navigation Satellite System) satellite, and the type of location information is different for each type. Of course, since GPS is a type of GNSS, the type of GPS location information is a type of GNSS location information. Hereinafter, it is assumed that information for correcting GNSS location information is GPS correction information for convenience of description. In addition, in the case of a GPS receiver mainly incorporated in the mobile communication terminals 171 and 173, the type of necessary GPS correction information is different according to GPS reception performance. Accordingly, the correction information generating server 110 generates GPS correction information according to the type of the GPS receiver, such as the first type and the second type, and transmits it to the broadcasting server 130 .

The broadcasting server 130 is a device provided by the present invention, and receives GPS correction information for each type from the correction information generating server 110 .

Here, the broadcasting server 130 matches the type of GPS correction information according to a frequency for data communication (eg, a frequency for LTE communication) allocated to each base station 151 and 153 . Matching the type of GPS correction information for each frequency band of the base station is due to the size constraint of the SIB to which the GPS correction information is provided.

Then, even if the mobile communication terminals 171 and 173 are in arbitrary positions, each frequency signal is detected from the neighboring base stations, and the base station of the most suitable signal is selected as the base station of the primary cell (hereinafter, referred to as the P cell). As such, the mobile communication terminals 171 and 173 may select and receive GPS correction information suitable for their type from among the types of GPS correction information transmitted from neighboring base stations. Hereinafter, it is assumed that the first type of GPS correction information is allocated to the first base station 151 and the second type of GPS correction information is allocated to the second base station 153 .

The broadcasting server 130 transmits the first type of GPS correction information matched to the first base station 151 to the first base station 151 , and transmits the first type of GPS correction information through the first base station 151 . broadcast Similarly, the broadcasting server 130 broadcasts the GPS correction information of the second type through the second base station 153 .

The first base station 151 receives the GPS correction information of the first type from the broadcasting server 130, and includes the received GPS correction information in the CBS-based SIB to the neighboring mobile communication terminals 171 and 173. broadcast Similarly, the second base station 153 receives the GPS correction information of the second type and broadcasts it to the neighboring mobile communication terminals 171 and 173 .

The first mobile communication terminal 171 has a built-in GPS receiver of the first type. The first mobile communication terminal 171 receives the first type of GPS correction information included in the SIB in the process of receiving the CBS from the first base station 151, which is the P-cell base station being accessed. Since the type of the GPS receiver and the type of the received GPS correction information match, the first mobile communication terminal 171 corrects the location information using the received GPS correction information. Similarly, the second mobile communication terminal 173 incorporating the second type of GPS receiver corrects the GPS location information with the second type of GPS correction information broadcast and received through the second base station 153 .

If the second mobile communication terminal 173 is located in the same cell as the first mobile communication terminal 171 and connects to the first base station 151 which is a P cell, the first type from the connected first base station 151 Receive GPS correction information. Since the second mobile communication terminal 173 has a built-in GPS receiver of the second type, it determines the inconsistency of the GPS correction information. At this time, the second mobile communication terminal 173 switches the SIB reception to receive the CBS from the second base station 153 while maintaining the communication connection for receiving the mobile communication service including the call from the first base station 151 . . Then, the second mobile communication terminal 173 may receive the CBS from the second base station 153 and receive the second type of GPS correction information through the SIB to correct the location information.

In the SIB reception switching according to the discrepancy is determined, the first embodiment of the present invention provides the type information of the GPS correction information of the adjacent base station from the SIB received from the first base station 151 by the second mobile communication terminal 173. Receive, check the second base station 153 suitable for the second type of the GPS receiver from the received type information, and switch to receiving the SIB to the confirmed second base station 153 . That is, the broadcasting server 130 further includes type information and connection information of GPS correction information of adjacent base stations as well as GPS correction information for each type in the broadcasting information transmitted to each base station 151 and 153 . Then, when the first and second mobile communication terminals 171 and 173 that have received the SIB from each of the base stations 151 and 153 are determined to be inconsistent, they refer to the received SIB information on the adjacent base station to match the type of GPS. The reception of the SIB may be switched to the neighboring base station broadcasting the correction information.

In the SIB reception switching according to the determination of the discrepancy, the second embodiment of the present invention scans a neighboring base station from which a CBS signal is caught and connects to the second base station 153 broadcasting the second type of GPS correction information. The scan repeats the CBS connection for each base station until the second mobile communication terminal 173 receives the SIB from each base station and finds a base station having a type of GPS correction information that matches its GPS receiver.

Meanwhile, the second mobile communication terminal 173 may fail to receive the second type of GPS correction information at a specific location. Then, the second mobile communication terminal 173 receives the second type of GPS correction information by unicast access to the correction information generating server 110 , and corrects the location information with the received GPS correction information. That is, when the mobile communication terminals 171 and 173 fail to receive GPS correction information suitable for their type by the broadcast method at an arbitrary location, the GPS correction information suitable for their type by an alternative unicast method is possible to receive

FIG. 2 is a schematic internal configuration diagram of the broadcasting server 130 of FIG. 1 . Referring to FIG. 2 , the broadcasting server 130 includes a storage unit 231 , a reception unit 233 , a query unit 235 , and a transmission unit 237 .

The storage unit 231 stores type information of GPS correction information matched to frequency information allocated to each base station 151 and 153 . For example, if the first type is matched to the A frequency band, the base station to which the A frequency is allocated is stored as broadcasting the first type of GPS correction information.

The receiver 233 receives GPS correction information for each type from the correction information generating server 110 .

The inquiry unit 235 queries the corresponding base stations from the storage unit 231 using the received GPS correction information type as a key.

The transmitter 237 transmits a broadcasting request including GPS correction information of a matched type to the inquired base stations.

In the case of the first embodiment, the inquiry unit 235 inquires from the storage unit 231 the type information of the GPS correction information matched to the neighboring base stations of each base station. The transmitter 237 further includes the type information of the GPS correction information of each of the inquired neighboring base stations in the broadcasting request and transmits it to the corresponding base station.

FIG. 3 is a schematic internal configuration diagram of the mobile communication terminal 300 of FIG. 1 . Referring to FIG. 3 , the mobile communication terminal 300 includes a GPS receiver 310 , a receiving unit 331 , a determining unit 333 , a switching unit 335 , and a correcting unit 337 . Here, the receiving unit 331 , the determining unit 333 , and the correcting unit 337 may be prepared as separate applications for receiving and correcting GPS correction information and stored in the memory, and the applications stored in the memory may be stored in the mobile communication terminal ( 300) may be executed by the processor.

The GPS receiver 310 receives a GPS signal. The current position is calculated by the received GPS signal. The GPS receiver 310 is classified into each type according to reception performance. The calculated current position is corrected by GPS correction information of a type that matches the classified type.

The receiving unit 331 receives a broadcasting message including GPS correction information from the base station. In the case of the first embodiment, the broadcasting message further includes type information and connection information of GPS correction information of neighboring base stations around the base station.

The determination unit 331 compares the received type information of the GPS correction information with the type information of the GPS receiver 310 to determine whether they match.

When the determination unit 331 determines that the type information of the GPS correction information does not match, the switching unit 335 switches to receive the SIB from the adjacent base station that matches the type information of the GPS receiver 310 .

Here, in the case of the first embodiment, the switching unit 335 receives the SIB with reference to the base station information that transmits the GPS correction information of the type matching the type of the GPS receiver 310 among the information of the neighboring base stations included in the broadcasting message. switch to In addition, in the case of the second embodiment, the switching unit 335 scans the neighboring base stations and switches the SIB reception to the neighboring base station that transmits the GPS correction information of the type matching the type of the GPS receiver 310 .

The correction unit 337 corrects the calculated current position with the matching type of GPS correction information.

4 is a flowchart of signal processing for receiving and converting type information of GPS correction information of another base station according to the first embodiment of the present invention.

The correction information generating server 110 transmits GPS correction information for each type information to the broadcasting server 130 (S401).

The broadcasting server 130 transmits the corresponding type of GPS correction information to each matched base station according to each type of GPS correction information (S402, S403). That is, the broadcasting server 130 transmits the corresponding first type GPS correction information to the first base station 151 and transmits the corresponding second type GPS correction information to the second base station 153 .

Then, when the mobile communication terminal 300 is located in the area covered by the first base station 151, the first base station 151 becomes a base station of the P cell and receives a connection from the mobile communication terminal 300 (S404) .

The mobile communication terminal 300 receives the SIB by the CBS provided from the first base station 151 (S405), checks the type of GPS correction information from the received SIB, and the confirmed type is the type of the GPS receiver 310 and it is determined that it does not match (S406).

The mobile communication terminal 300 refers to the neighboring base station information from the received SIB, and identifies the second base station 153 that transmits the GPS correction information of the type matching the type of the GPS receiver 310 from the referenced information ( S407).

The mobile communication terminal 300 switches to receive the SIB from the confirmed second base station 153 . The mobile communication terminal 300 receives the GPS correction information matching the type through the SIB from the second base station 153 and corrects the current position (S408, S409).

5 is a flowchart of signal processing for receiving and converting type information of GPS correction information of another base station according to the second embodiment of the present invention.

The second embodiment differs from the first embodiment in Fig. 4 in receiving the GPS correction information of the type matched by the SIB scan process. In the following, descriptions of the same processes as those of the first embodiment are omitted and only differences are described.

After determining the type mismatch, the mobile communication terminal 300 scans a base station transmitting GPS correction information matching the type of the GPS receiver by receiving one SIB for each neighboring base station (S501).

When the matching type base station is scanned, the mobile communication terminal 300 corrects the location information with the GPS correction information included in the received SIB (S502).

6 is a schematic internal configuration diagram of a broadcasting server 630 for controlling overload of a base station according to a third embodiment of the present invention. Referring to FIG. 6 , the broadcasting server 630 according to the third embodiment of the present invention further includes a collection unit 631 , a determination unit 633 , and a transmission unit 237 .

The collection unit 631 collects situation information for each base station from the monitoring server 600 . Here, the monitoring server 600 receives and monitors information related to the access terminal of each base station, processing status, failure, traffic, etc., and transmits the status information for each base station to the collecting unit 631 .

The determination unit 633 compares the collected base station situation information with reference information to determine whether the first base station 651 is overloaded in processing broadcasting, and when the overload is determined, the first base station 651 is selected. It determines the second base station 653 to replace the broadcasting. When the second base station 653 is determined, the determination unit 633 generates control information related to the replacement determination.

Here, the determination unit 633 compares the broadcast-related load information with the context information. When the information to be broadcast by the base station increases, the broadcasting load of the base station increases.

Preferably, when determining the replacement base station, the determination unit 633 determines the second base station 653 having a lower load than the first base station 651 . The determination unit 633 may determine the second base station 653 having a lower load than the first base station 651 and transmitting the GPS correction information of the same type as that of the first base station 651 .

Here, the determiner 633 may compare disaster broadcasting information such as disaster text as the situation information. When it is determined that the first base station 651 is overloaded due to the disaster broadcast, the determiner 633 may determine the second base station 653 that does not transmit the disaster broadcast. Also, the determination unit 633 may determine the second base station 653 that does not transmit the disaster broadcast and transmits the GPS correction information of the same type as that of the first base station 651 .

Further, the determination unit 633 determines the time when the first base station 651 in the overload state ends broadcasting of the GPS correction information, the time when the second base station 653 to be replaced starts broadcasting the GPS correction information, and The control information including the access information of the second base station 653 is generated.

The transmitting unit 237 transmits a broadcasting request further including the generated control information to the first base station 651 . The first mobile communication terminal 671 that has received the generated control information through the first base station 651 switches SIB reception to the second base station 653 with reference to the control information.

For example, in a state in which no overload occurs, the first type of GPS correction information transmitted from the broadcasting server 630 is transmitted through the first base station 651 to the first mobile communication terminal having the first type of GPS receiver. It is broadcast to (671). Similarly, the second type of GPS correction information is broadcast to the second mobile communication terminal 673 through the second base station 653 (①, ②).

Here, the determination unit 633 determines the overload of the first base station 651 and determines the second base station 653 to replace the first base station 651 . Then, the transmitting unit 237 transmits the control information generated in relation to the replacement decision to the first base station 651 . Control information is broadcast to the first mobile communication terminal 671 through the first base station 651 (③, ④). Here, the control information includes the time when the broadcasting of the GPS correction information of the first base station 651 ends, and the connection information of the second base station 653 to transmit the GPS correction information of the same type as the GPS correction information transmitted from the first base station 651 . and a broadcasting start time of the GPS correction information of the second base station 653 .

As the control information is transmitted, the broadcasting server 630 transmits the same type of GPS correction information as the first type of GPS correction information transmitted from the first base station 651 through the second base station 653 through the first mobile communication. Broadcast to the terminal 671. If the type of the GPS correction information transmitted from the second base station 653 is the second type, the transmitter 237 transmits a second broadcasting request including each of the first and second types of GPS correction information. It is transmitted to the base station 653 . The second base station 653 allocates and broadcasts the first type of GPS correction information and the second type of GPS correction information to different blocks of the SIB, respectively. Then, the first and second mobile communication terminals 671 and 673 simultaneously receive the same SIB through the second base station 653, and each extracts GPS correction information suitable for their own type from the corresponding block to obtain the location information. Correct (⑤, ⑥). Of course, if the second base station 653 is already matched to transmit the first type of GPS correction information, the transmitter 237 transmits the first type of GPS correction information to the second base station 653 without additional processing. to send

If it is assumed that there is no access information of the second base station 653 in the control information, the first mobile communication terminal 671 may switch access to the second base station 653 scanned by the scan process.

7 is a flowchart of signal processing for controlling overload of a base station according to a third embodiment of the present invention.

The mobile communication terminal 300 accesses the first base station 651 of the P cell, receives the SIB, and corrects the location information with GPS correction information that matches the type of the GPS receiver. Of course, the mobile communication terminal 300 may receive the SIB from the first base station 651 by SIB reception switching.

The broadcasting server 630 receives the load situation for each base station from the monitoring server 600 (S701). When the broadcasting server 630 determines the overload of the first base station 651 (S702), it determines the second base station 653 as an alternative base station (S703), and generates control information related to the replacement of the base station. The generated control information is transmitted to the mobile communication terminal 670 through the first base station 651 (S704).

After the end of the broadcasting of the first base station 651, the broadcasting server 630 transmits a broadcasting request including the first type and the second type of GPS correction information to the second base station 653 (S705). ). The mobile communication terminal 670 switches SIB reception to the second base station 653 based on the access information of the second base station 653 included in the received control information to receive GPS correction information (S706), and the received GPS The GPS position is corrected with the correction information (S707).

Although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and claims to be described below by those skilled in the art to which the present invention pertains Of course, various modifications and variations are possible within the equivalent range of the range.

100: system 110: calibration information generation server
130: broadcasting server 151: first base station
153: second base station 171: first mobile communication terminal
173: second mobile communication terminal

Claims (28)

An apparatus for broadcasting GPS correction information to a mobile communication terminal through a base station, the apparatus comprising:
a storage unit for storing type information of GPS correction information for each base station;
a receiver for receiving GPS correction information from the correction information generating server;
an inquiry unit for inquiring from the storage unit a first base station corresponding to the type of the received GPS correction information; and
A transmission unit for transmitting a broadcasting request including the received GPS correction information to the first base station inquired by the inquiry unit
A device comprising a. The method of claim 1,
The inquiry unit,
Inquiring from the storage unit the type information of the GPS correction information of the neighboring base station of the first base station,
The transmission unit,
and including type information of the GPS correction information of the neighboring base station in the broadcasting request. The method of claim 1,
a collection unit for collecting situation information for each base station; and
Further comprising a determination unit for determining a second base station to broadcast the received GPS correction information by replacing the first base station based on the situation information for each base station, and generating control information related to the replacement determination,
The transmission unit,
and including the generated control information in the broadcasting request. 4. The method of claim 3,
The situation information is an apparatus, characterized in that load information. 5. The method of claim 4,
The determining unit is
Apparatus for determining a second base station having a lower load than the first base station based on the load information for each base station. 5. The method of claim 4,
The determining unit is
An apparatus characterized in that the second base station having a lower load than the first base station based on the load information for each base station and corresponding to the type of the received GPS correction information is determined. 4. The method of claim 3,
The situation information is disaster broadcasting information. 8. The method of claim 7,
The determining unit is
Apparatus for determining a second base station that does not transmit a disaster broadcast. 9. The method of claim 8,
The determining unit is
An apparatus for not transmitting a disaster broadcast, and determining a second base station corresponding to the type of the received GPS correction information. 4. The method of claim 3,
The determining unit is
The apparatus of claim 1, wherein the control information is generated including a broadcasting end time of the GPS correction information of the first base station, a broadcasting start time of the GPS correction information of the second base station, and access information of the second base station. A mobile communication terminal for receiving GPS correction information, the mobile communication terminal comprising:
a GPS receiver for receiving GPS signals;
a receiver for receiving a broadcasting message including GPS correction information from a base station;
a determination unit that compares the received type information of the GPS correction information and the type information of the GPS receiver to determine whether the information matches; and
and a correction unit for correcting the position measured based on the GPS signal by using the GPS correction information when the determination result is the same. 12. The method of claim 11,
and a switching unit for switching to another base station whose type information matches the type information of the GPS receiver when the determination result does not match. 13. The method of claim 12,
The conversion unit,
When the broadcasting message includes control information for switching broadcasting of the GPS correction information, the base station for receiving the GPS correction information is switched to another base station with reference to the control information. 14. The method of claim 13,
The control information is
A mobile communication terminal comprising: an end time of broadcasting of GPS correction information of a currently accessed base station; a start time of broadcasting of GPS correction information of another base station; and access information of the other base station. A method for a device to broadcast information to a mobile communication terminal through a base station, the method comprising:
storing type information of GPS correction information for each base station;
receiving GPS correction information from a correction information generating server;
inquiring a first base station corresponding to the type of the received GPS correction information from among the base stations for each of the stored type information; and
transmitting a broadcasting request including the received GPS correction information to the inquired first base station;
How to include. 16. The method of claim 15,
The inquiry step is,
Inquiring the type information of the GPS correction information of the neighboring base station of the first base station,
The transmitting step is
and including type information of the GPS correction information of the neighboring base station in the broadcasting request. 16. The method of claim 15,
Before the step of transmitting,
collecting context information for each base station;
Further comprising the step of determining a second base station to broadcast the received GPS correction information by substituting the first base station based on the context information for each base station, and generating control information related to the determination of the replacement;
The transmitting step is
and including the generated control information in the broadcasting request. 18. The method of claim 17,
The situation information is a method, characterized in that load information. 19. The method of claim 18,
The determining step is
and determining a second base station having a lower load than the first base station based on the load information for each base station. 19. The method of claim 18,
The determining step is
and determining a second base station having a lower load than the first base station based on the load information for each base station and corresponding to the type of the received GPS correction information. 18. The method of claim 17,
The method, characterized in that the situation information is disaster broadcasting information. 22. The method of claim 21,
The determining step is
Method characterized in that the step of determining a second base station that does not transmit the disaster broadcast. 23. The method of claim 22,
The determining step is
The method comprising the step of not transmitting a disaster broadcast and determining a second base station corresponding to the type of the received GPS correction information. 18. The method of claim 17,
The generating step is
The step of generating the control information including the broadcast end time of the GPS correction information of the first base station, the broadcasting start time of the GPS correction information of the second base station, and the access information of the second base station, characterized in that Way. A method for a mobile communication terminal to receive GPS correction information, the method comprising:
GPS signal receiving step of receiving a GPS signal;
Receiving a broadcasting message including GPS correction information from a base station;
comparing the received type information of the GPS correction information with the type information of a GPS receiver built in the mobile communication terminal to determine whether they match; and
correcting the position measured based on the GPS signal by using the GPS correction information when the determination result is the same
How to include. 26. The method of claim 25,
If the determination result does not match, the method further comprising the step of switching to another base station of the type information that matches the type information of the GPS receiver. 27. The method of claim 26,
The conversion step is
and switching a base station to receive GPS correction information to another base station by referring to the control information when the broadcasting message includes control information for switching broadcasting of the GPS correction information. 28. The method of claim 27,
The control information is
A method according to claim 1, comprising: an end time of broadcasting of GPS correction information of a currently accessed base station; a start time of broadcasting of GPS correction information of another base station;

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