KR20060030183A - Mobile phone based real time navigation-on-demand method, navigation system, the mobile phone and navigation server - Google Patents

Abstract

The mobile phone-based real-time on-demand navigation method according to the present invention, the mobile phone of the navigation service user vehicle transmitting the start / end information of the vehicle movement determined by the user to the navigation server; The navigation server receives time / end point information and collects current progress information of mobile phones of a navigation service subscriber vehicle existing within a range corresponding to time / end point information. Determining, by the navigation server, an optimal route for the start / end point using the collected current progress information of the mobile phones of the subscriber vehicle; Transmitting, by the navigation server, the optimum route information to a mobile phone of a user vehicle; And receiving, by the mobile phone of the user vehicle, optimal path information and providing the same to the user.

According to the present invention, the real-time traffic information according to the user's request is collected by unifying the conventional dual traffic information collection and navigation system, thereby providing a mobile phone-based navigation service that immediately reflects the dynamic changes in road conditions. can do. In addition, according to the present invention, the request and provision of traffic information are performed using an existing mobile phone multiplexing access method. Therefore, a low cost and efficient navigation service can be provided.

Description

Mobile phone based real time navigation-on-demand method, navigation system, the mobile phone and navigation server}

1 is a flowchart illustrating a navigation method according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining a preferred embodiment of step S102 illustrated in FIG. 1, that is, a method of collecting current progress information of subscriber vehicles.

FIG. 3 is a flowchart for explaining a preferred embodiment of step S204 shown in FIG.

4 is a block diagram illustrating a navigation system for performing a mobile phone-based real-time on-demand navigation method of the present invention.

5 is a schematic diagram of service provision of the navigation system of the present invention.

6 is a block diagram for explaining a preferred embodiment of the mobile phone of the present invention shown in FIG.

FIG. 7 is a block diagram illustrating an exemplary embodiment of the route information request unit shown in FIG. 6.

FIG. 8 is a block diagram illustrating a preferred embodiment of the traffic information provider 302 shown in FIG. 6.

FIG. 9 is a block diagram illustrating an exemplary embodiment of the vehicle progress information measuring unit illustrated in FIG. 6.

FIG. 10 is a block diagram illustrating another exemplary embodiment of the vehicle progress information measuring unit illustrated in FIG. 6.

FIG. 11 is a block diagram for explaining a preferred embodiment of the navigation server 102 of the present invention shown in FIG.

FIG. 12 is a block diagram illustrating an exemplary embodiment of the traffic information requesting unit 502 shown in FIG. 11.

The present invention relates to vehicle navigation using a mobile phone.

The increase in the number of automobiles in Korea is about 12%, while the increase in road facilities is less than 0.5%, which is intensifying the imbalance in traffic demand and traffic supply. As a result, congestion costs due to traffic jams are increasing day by day.

In recent years, various services have been developed to collect road traffic information and provide it to citizens as a way to improve the efficiency of transportation facilities. The system that provides such services is called intelligent transportation systems (ITS).

There are two ways to collect road traffic information. One is a device installation on the road, the other is a terminal operation method in the vehicle.

The road device installation method is a method of installing various devices such as a vehicle speed sensor and a road monitoring camera in a road or facility around a road and detecting various conditions of the road from the device. In the road device installation method, it is not possible to collect traffic information of the area where the detection device is not installed.

An in-vehicle terminal operating method is a method of installing a traffic information collecting terminal such as a global positioning system (GPS) module in a vehicle and collecting traffic information using the same. Such in-vehicle terminals are called telematics terminals. Telematics is a term for an information service that can be provided in an automobile using wireless data communication, and is a compound word of telecommunication and informatics. The conventional in-vehicle terminal operation method collects traffic information uniformly under the plan of a service provider (hereinafter, 'center') of traffic information, and thus does not reflect user's requirements. In other words, it collects traffic information and utilizes the collected information (navigation, etc.). Due to the uniform collection of traffic information in the center, uninterested information accumulates and shadowed areas of traffic information collection occur. The conventional in-vehicle terminal operating method has a problem in that as the area for collecting traffic information becomes wider, the data processing load of the center increases and the communication amount increases.

Conventional techniques related to ITS by an in-vehicle terminal operation scheme include the following.

Korean Laid-Open Patent Publication No. 2003-80385 "Traffic information sensing device using GPS and traffic information sensing method using the same" adopts the concept of client server, and the traffic situation information automatically collected from the client, which is a vehicle, When approaching within a certain radius, it is delivered in real time to a server that is a traffic control center by using wireless communication equipment, and the traffic control server uses geographic information system (GIS) that is utilized in the field by using data input from a telematics device. Traffic information detection method using GPS that provides traffic volume information to operate traffic guidance system in various ways such as PC communication, internet, ARS, broadcasting by using various application programs that operate Start the device. In particular, the method includes a vehicle capable of receiving traffic information in order to prevent traffic information from being transmitted to the traffic collection server, so that duplicate traffic information is not transmitted to the traffic collection server. Provides a traffic information collection method and system that allows only selected vehicle equipped with the selected terminal to transmit traffic information to the traffic collection server. However, because the technology collects information about the area when a vehicle within a certain radius of the desired area passes the desired road, it cannot gather information about the area unless the vehicle that wants traffic information passes through the area.

Korean Patent Laid-Open Publication No. 2004-37689 "Traffic information collection method using a navigation system" includes an initial information transmission step of inputting the current location information and destination information to the information center via a mobile communication network; The information center retrieves route data based on pre-stored map data and traffic information of the driving route between the current location and the destination to generate optimal route guidance data for guiding at least one node point on the driving route. A data transmission step of transmitting through a mobile communication network; A driving guidance step of guiding voice information to travel through the node point before the vehicle passes the node point according to the route guidance data; A traffic information providing step of transmitting location information of the moving route to the information center at a predetermined cycle during the route guidance operation; A data update step of extracting speed information of a current movement route according to the traffic information, grasping traffic flows according to time zones and routes, and updating and storing traffic information; After the data update step is completed, a method comprising an update data transmission step of generating and transmitting an optimal route guidance data based on map data and updated traffic information when requesting a service is proposed. The traffic information collecting method uses a traffic information collecting vehicle (probe car), but since the service subscriber uses voluntary information, there is an advantage that the cost of operating the collected vehicle does not occur. However, this relates to a method of spontaneously collecting information from a user terminal and to providing the collected information to a later user. As a result, the collection and use of traffic information is dualized, and information on dynamic changes in road conditions cannot be collected immediately. In addition, since this method collects information on the move only for the route requested by the user terminal, the optimum route cannot be determined according to the dynamic traffic situation by the user's request.

In addition, the technique disclosed in Korean Patent Laid-Open Publication No. 2001-16712, "Method for collecting traffic information, apparatus, and program storage medium using probe car," can significantly lower the initial investment cost for the infrastructure for collecting traffic information. The advantage is that an efficient traffic information service can be implemented. However, this technique is a method of collecting traffic information through a specific route of a designated probe car, and thus has a disadvantage in that the traffic information collecting area is not wide.

In recent years, vehicle navigation using a mobile phone is becoming more common as an in-vehicle terminal operating method, but since communication costs are high, its use is limited.

The conventional techniques described above have the following problems.

First, shadowing time and shadowed area of traffic information collection occur. As traffic information is expanded, there are physical limitations such as increased processing load and increased traffic volume in the center.

Second, the traffic information collection and its utilization system are dualized and do not immediately reflect the dynamic changes in road conditions.

Third, the conventional vehicle navigation method using a mobile phone takes a lot of communication costs and thus is restricted in use.

Accordingly, the technical problem to be achieved by the present invention is that a traffic shadow area does not occur, and can dynamically respond to road traffic conditions that change frequently, and a low-cost, efficient mobile phone-based real-time on-demand navigation method, navigation system, mobile phone, and navigation To provide a server.

Mobile phone based real-time on-demand navigation method according to the present invention for achieving the above technical problem, (a) the mobile phone of the navigation service user vehicle (hereinafter referred to as 'user mobile phone') the start / end of the vehicle movement determined by the user Transmitting information to a navigation server (hereinafter referred to as a 'server'); (b) the server receives the time / end information and collects the current progress information of mobile phones (hereinafter referred to as subscriber phones) of the navigation service subscriber vehicle existing within the range corresponding to the time / end information. step; (c) determining, by the server, an optimal path for the time / endpoint using the collected current status information of the subscriber cellular phones; (d) the server transmitting the optimal path information to the user's mobile phone; And (e) receiving, by the user cellular phone, the optimum path information and providing the same to the user.

The current progress information of the subscriber cellular phone includes the speed information of the subscriber cellular phone. In addition, the current progress information of the subscriber mobile phone may further include coordinate information of the subscriber mobile phone. The current progress state information of the subscriber cellular phone may further include measurement time information of the progress rate information.

In the step (b), the server, (b1) identifying the position on the map of the received time / end information; (b2) searching for one or more paths connecting the time / endpoints; And (b3) collecting current progress information transmitted by subscriber mobile phones which are present on the searched path and traveling in the same direction as the direction of the time / endpoint through the base station corresponding to the searched path.

The path searched in the step (b2) may be configured in the form of a link of small segments.

After the step (b3), the server may further comprise the step of selecting a predetermined number of current progress information for each search path according to the degree of matching with the search path among the current progress information received from the subscriber cell phone.

In step (b3), the server transmits base station information and direction information to the subscriber mobile phone; If the subscriber cellular phone communicating with the base station is determined to be within the coordinate information and tolerance range of the base station and is the same as the moving direction, transmitting the coordinate information of the vehicle to the server; Selecting, by the server, a predetermined number of subscriber cell phones according to the degree of matching of the coordinate information of the vehicle and the search path and requesting traffic information; And a subscriber's mobile phone receiving the traffic information to transmit vehicle speed information to the server.

The base station information and the direction information may be transmitted by adding one or more fields to one or more messages included in an overhead message of a mobile phone multiplexing access method.

In addition, the base station information and the direction information may be transmitted by adding one or more messages in the overhead message of the mobile phone multiplexing access method.

The coordinate information of the subscriber's mobile phone and the speed information of the subscriber's mobile phone may be transmitted by adding one or more fields to one or more registration formats included in a registration message transmitted from the mobile phone to the base station. have.

In addition, the coordinate information of the subscriber cell phone and the speed information of the subscriber cell phone may be transmitted by adding one or more registration formats in the location registration message transmitted from the mobile phone to the base station.

The speed information of the subscriber's mobile phone may be calculated by time information and location information of the subscriber's mobile phone.

In the step (c), the server may calculate the travel time for each of the searched paths, and may determine a path having the smallest time calculated as the optimum path.

The travel time for each route may be calculated by dividing the total distance of each route by the average speed of the vehicles for each route.

In the step (e), the user's mobile phone may receive the optimal path information, display it as a map, and provide the same to the user.

In the step (e), the user's mobile phone may receive the optimal route information, display it as road guidance voice information, and provide the same to the user.

The real-time on-demand navigation system based on the mobile phone according to the present invention for achieving the above technical problem, by specifying the start / end point of the vehicle movement requesting route information to receive the route information from the outside, in response to the external traffic information request Two or more mobile phones for providing traffic information including current progress information of the vehicle; A navigation server configured to receive the traffic information from another mobile phone according to a request for route information of one mobile phone, determine an optimal route information using the traffic information, and provide the same to the mobile phone requesting the route information; It is characterized in that it comprises a base station for connecting the mobile phone and the navigation server.

According to an aspect of the present invention, there is provided a mobile phone for real-time on-demand navigation, comprising: a map database storing geographic information; A route information request unit which transmits a route information request including route information on a start / end point of vehicle movement determined by a user to the outside and receives optimum route information provided from the outside; A vehicle progress information measuring unit measuring current progress state information of the vehicle; A navigation controller for guiding the progress of the vehicle to the user by using optimal path information provided from the outside; And a traffic information providing unit configured to provide current progress status information of the vehicle transmitting the current progress status information of the vehicle in response to the traffic information request received from the outside.

The vehicle progress information measuring unit includes a position measuring unit measuring a current position of the vehicle; A speed measuring unit measuring a traveling speed of the vehicle; And it may include a direction measuring unit for measuring the traveling direction of the vehicle.

The location measuring unit may include a GPS module that generates and outputs current location information of a vehicle from GPS information received from a GPS satellite. The location measuring unit may generate current location information of the vehicle by the DGPS method.

The speed measuring unit may calculate a traveling speed of the vehicle by dividing a distance between two positions measured by the position measuring unit by a time difference measured by the two positions.

The traffic information provider may include: a traffic information request receiver configured to receive a traffic information request from the outside, demodulate it, and output the demodulated signal; A position direction comparison unit for comparing the demodulated information with the current progress state information of the vehicle and outputting the current progress state information of the vehicle according to the comparison result; And a traffic information transmitter for transmitting the current progress status information of the vehicle.

According to an aspect of the present invention, there is provided a navigation server for real-time on-demand navigation, comprising: a map database storing geographic information; A route information providing unit for demodulating the route information request received from the outside, extracting and outputting time / endpoint information therefrom, and modulating the input optimal route information to the outside; A route search unit for searching for and outputting a route connecting the city / end point from the map database by inputting the city / end point information; A traffic information request unit for modulating and transmitting the traffic information request signal including the found route information to the outside, and demodulating and outputting the traffic information received from the outside; And an optimum route determination unit that determines and outputs an optimal route among the searched routes using the demodulated traffic information.

The traffic information request unit includes: a base station selector which selects a base station covering the searched route and outputs coordinate information of the base station; A vehicle caller on a path for transmitting a call signal including the base station coordinate information to a subscriber cell phone communicating with the base station; A vehicle coordinate receiver configured to demodulate and output coordinate information of a subscriber's mobile phone received from the outside; A vehicle selection unit configured to input coordinate information of the subscriber's mobile phone, select a subscriber's mobile phone to request traffic information, and output identification information of the selected subscriber's mobile phone; A traffic information request transmitter which modulates identification information of the selected subscriber cellular phone and transmits it as a call signal; And a traffic information receiver for demodulating and outputting the traffic information received from the outside.

The above-described mobile phone-based real-time on-demand navigation method of the present invention may be implemented as a computer-readable recording medium recording a program for execution on a computer.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The basic object of the present invention is to provide a low-cost, efficient mobile phone-based real-time on-demand navigation method, navigation system, mobile phone, and navigation server that do not generate a traffic information shadow area, and can dynamically respond to road traffic conditions that change frequently. It is.

Features of the present invention for achieving this goal are as follows.

First, the present invention provides a real time navigation-on-demand navigation service of a navigation service concept according to the needs of a real-time user. That is, it collects traffic information about the dynamic route selected by the user and provides a navigation service based on this.

Secondly, the present invention collects traffic information in accordance with a user's request by utilizing terminals of all vehicles subscribed to a navigation service. Therefore, the shadow area of traffic information does not occur.

Third, the present invention uses the existing mobile phone multiplexing access method to request and provide traffic information. Therefore, a low cost and efficient navigation service can be provided.

Fourth, in the present invention, the navigation server selects the collected information to determine an optimal path according to a user's request. Thus, the server can prevent the unnecessary computational load.

The navigation method of the present invention is provided between a mobile phone of a user vehicle of a navigation service (hereinafter referred to as a 'user cellular phone'), a navigation server (hereinafter referred to as a 'server') and a mobile phone of a navigation service subscriber vehicle (hereinafter referred to as a subscriber cell phone). Is done in

Figure 4 is a block diagram illustrating a navigation system for performing a mobile phone-based real-time on-demand navigation method of the present invention, two or more mobile phones 100 and the navigation server 102 of the present invention is a base station 104 It is configured to communicate through.

In the navigation system of the present invention, the mobile phone 100 may request route information from the navigation server 102 or provide traffic information in response to a request of the navigation server 102.

In the navigation system of the present invention, the navigation server 102 may provide the optimal route information according to the request of the mobile phone 100, and may request the provision of the traffic information to the mobile phone 100.

The device configuration of the mobile phone 100 and the navigation server 102 of the present invention will be described in detail with reference to FIG.

5 is a schematic diagram of service provision of the navigation system of the present invention. The navigation server 202 of the present invention, which has received the route information request of the user mobile phone 200 of the present invention, collects traffic information from subscriber mobile phones 204-1, 204-2,. The route is determined, and optimal path information is provided to the user mobile phone 200.

The term 'user mobile phone' used below refers to a mobile phone for requesting route information service, and the 'subscriber mobile phone' refers to a mobile phone for providing traffic information of the current state of a vehicle according to a traffic information request of a navigation server.

1 is a flowchart illustrating a navigation method according to an embodiment of the present invention.

First, the user mobile phone transmits the start / end point information of the vehicle movement determined by the user (S100). When the user inputs the start / end point information of the vehicle movement using the input device provided in the mobile phone and sends a transmission instruction, the user cell phone transmits the start / end point information of the vehicle movement determined by the user to the server.

The server receiving the time / end information collects the current progress information of subscriber cellular phones existing within the range corresponding to the time / end information (S102). At this time, the server may search for a plurality of paths existing between time / endpoints and collect current progress information of subscriber mobile phones existing on the searched paths. The current progress state information may include the progress speed information of the subscriber cell phone, the coordinate information of the subscriber cell phone.

After step S102, the server determines the optimal path for the start / end point using the collected current progress information (S104). When the current progress information includes the coordinate information of the subscriber's mobile phone, the current progress information collected by the search route may be selected according to the degree of matching with the search route using the coordinate information.

After step S104, the server transmits the determined optimal path to the user mobile phone (S106). The user mobile phone provides the optimal path information received to the user to perform navigation (S108).

FIG. 2 is a flowchart for explaining a preferred embodiment of step S102 illustrated in FIG. 1, that is, a method of collecting current progress information of subscriber vehicles.

The server first grasps the position on the map of the received time / end point information (S200).

After the step S200, the server searches for one or more paths connecting the city / end point on the map (S202). Only one route may be searched or two or more routes may be searched, depending on the distance and geography of the start / end point. The searched path may be configured in the form of a link of small segments. The unit segment may be a predetermined distance unit, an intersection unit, or a traffic light unit.

After the step S202, the server collects the current progress information of the subscriber cell phone existing on the searched path and proceeding in the same direction through the base station corresponding to the searched path (S204).

In order for the subscriber cell phone to determine whether the subscriber cell phone exists on the searched path and the same traveling direction, the server must provide the search path information and the direction information to the subscriber cell phone through the base station. The subscriber's mobile phone provides the server with the information necessary for determining the optimal route, that is, the speed information. At this time, in order to allow the server to select the information once again, the speed information and the coordinate information may be provided to the server together. The server may be provided with the moving speed information and the coordinate information to calculate the average speed for each segment.

The current vehicle progress status information may include time information. That is, if the interval between the time that the subscriber cellular phone provided the information and the time when the server received the information is large, the server may determine that the information is invalid and discard it.

FIG. 3 is a flowchart for explaining a preferred embodiment of step S204 shown in FIG. 2 and shows current progress information of subscriber mobile phones existing on the searched path through a base station corresponding to the searched path by a server. Indicates to collect. The method of FIG. 4 is a method in which a server selects a subscriber's mobile phone and collects traffic information.

First, the server transmits coordinate information and direction information of the base station corresponding to the search path to the subscriber cell phone communicating with the base station (S310).

The subscriber's mobile phone communicating with the base station transmits the vehicle ID and the vehicle coordinate information to the server when the traveling direction is the same and exists within the tolerance range compared with the base station coordinates (S312).

The server compares the search path with the received vehicle coordinate information, selects a predetermined number of vehicles for each search path, and requests vehicle speed information from the subscriber's mobile phone of the selected vehicle (S314).

The selected subscriber cell phone transmits progress speed information to the server (S316).

In step S310 and step S314, the base station information, the progress direction information, and the traffic information request transmitted from the base station to the subscriber mobile phone are transmitted using an overhead message of the mobile phone multiplexing method or an additional overhead message. Can be.

Channels used in the forward link from the base station to the mobile phone include pilot channels, sync channels, paging channels, and traffic channels. The pilot channel, sync channel, and call channel are always launched continuously from the base station.

The mobile phone receives the pilot signal and requests a call to the base station with the strongest pilot signal. At this time, the base station receiving the call sends a sync channel message. The sync channel message includes information such as long code sync information, current system time, and data rate of the call channel.

In this case, the calling channel obtains time synchronization information from the synchronization channel message, and the mobile station adjusts its timing to adjust the system time. The call channel is coded and interleaved and the modulated spread spectrum signal is transmitted. There are four types of messages transmitted from the base station to the mobile phone through the call channel: an overhead message, a paging message, an order message, and a channel assignment message.

The overhead message includes messages containing system configuration information (system parameter message, access parameter message, neighbor list message, cdma channel list message, etc.). In the present invention, the base station makes a request for providing traffic information to the mobile phone using an overhead message. This will be described later.

The call message is sent when the base station receives a signal requesting communication from the mobile station.

Command messages are used to control certain cell phones, such as blocking abnormal or unregistered cell phones.

The channel assignment message allows the base station to assign a talk channel to the mobile station.

In the method for requesting the provision of traffic information to a mobile phone by using the aforementioned overhead message, a method of adding a request bit for collecting traffic information in messages included in the first overhead message, and second overhead Apart from the message, there is a method of adding a request message for requesting provision of traffic information. The first method is a method of allocating a predetermined bit for each field by adding one or more fields for providing traffic information to each message included in the overhead message. The second solution will be described later.

At this time, in order to ensure the real-time collection of traffic information, the mobile phone side needs to periodically or continuously examine the contents of the received overhead message or additional message.

Hereinafter, as an example of a base station transmission scheme, a transmission scheme for adding a traffic information request message as shown in Table 1 below, in addition to the existing CDMA overhead message, will be described.

Field Length (bits) PILOT_PN 9 … … BASE_ID 16 NO_P_LIST 5 P_LIST1 △ … … P_LISTn △ DERECTION_CAR 3 … …

Where BASE_ID: ID of the base station, NO_P_LIST: number of coordinates of the latitude and longitude coordinates of the base station, P_LIST1 ~ P_LISTn: list of coordinates of latitude and longitude coordinates of the base station, DIRECTION_CAR: direction of travel (north, northeast, east, southeast, southwest, west) , Northwest).

Hereinafter, as another example of the base station transmission scheme, a transmission scheme for transmitting a message for calling a traffic information providing vehicle, for example, as shown in Table 2, separately from the existing CDMA 12 overhead messages will be described.

Field Length (bits) PILOT_PN 9 … … TELEM_GET 2 CAR_ID 32 … …

Here, TELEM_GET: a bit representing requesting information, and CAR_ID: an identification number of a vehicle or a mobile phone terminal.

In step S312 and step S316, the coordinate information of the subscriber cell phone and the speed information of the subscriber cell phone add one or more fields to one or more registration formats included in a registration message transmitted from the cell phone to the base station. Or by adding one or more registration types in the location registration message.

Hereinafter, a description will be given of an example of mobile phone side transmission utilizing location registration.

A zone is formed by gathering one or more base stations. When a mobile phone enters a new area or performs a similar effect, the zone reports the information to the base station. It is called).

In other words, location registration is a process in which a mobile phone notifies its base station of its location. If the location is not registered, since the system does not know the location of the mobile phone, the mobile phone must be called through all the base stations, thereby increasing the call volume. Therefore, if you frequently register the location it is possible to determine the exact location of the mobile phone call volume is reduced. However, too frequent registration will overload the access channel and call channel, so the equipment should be designed by optimizing it.

The current CDMA system provides ten registration schemes as shown in Table 1 below.

Kinds system One Power-up registration When the phone is powered on or when switching from another system or analog system to CDMA system 2 Power-up registration Do when your phone is powered off 3 Timer-based registration After a certain time 4 Distance-based registration Performed when the current base station is out of a certain distance from the last registered base station 5 Zone-based registration If your phone enters a new area 6 Parameter change registration Performed when the phone number of mobile phone is changed 7 Ordered registration If the base station requested registration 8 Indirect registration Whenever a mobile phone uses an access channel, the base station can know the location of the mobile phone. 9 Traffic Channel registration Whenever a base station receives registration information of a mobile phone assigned to a call channel, the base station notifies that the mobile phone is registered. 10 User Zone Registration The mobile station registers when it selects an active User Zone

The registration form for this registration method is shown in Table 4, for example.

Field Length (bits) REG_TYPE 4 SLOT_CYCLE_INDEX 3 MOB_P_REV 8 SCM 8 MOB_TERM One RETURN_CAUSE 4 QPCH_SUPPORTED 0 or 1 ENHANCED_RC 0 or 1 UZID_INCL 0 or 1 UZID 0 or 16

Here, the REG_TYPE field means a registration type and indicates an identification number of the registration method of Table 3. The following fields are those required for the regional standard registration. Therefore, there are respective registration formats corresponding to the ten registration methods.

As an example of mobile phone-side transmission for reducing communication costs and improving communication efficiency in steps S312 and S316, a method of transmitting vehicle location information and speed information by adding a new field to these existing ten registration formats is provided. Can be mentioned.

In addition, as another example of mobile phone-side transmission for reducing communication costs and improving communication efficiency in steps S312 and S316, a method of transmitting vehicle location information and speed information by adding a new registration type other than the existing ten registration types. Can be mentioned.

Table 5 below shows an example of a new registration format for transmitting vehicle latitude and longitude coordinates.

Field Length (bits) REG_TYPE 4 … … CAR_ID 32 CAR_LAT 22 CAT_LONG 23 … …

Here, CAR_ID means an identification number of a vehicle or a mobile phone terminal, CAR_LAT: vehicle latitude coordinate, and CAR_LONG: vehicle longitude coordinate.

Table 6 below shows an example of a new registration format for transmitting vehicle speed information.

Field Length (bits) REG_TYPE 4 … … CAR_ID 32 CAR_SPEED 22 … …

Here, CAR_ID: identification number of the vehicle or mobile phone terminal, CAR_SPEED: means the vehicle speed information.

The speed information of the vehicle may be calculated by time information and location information of the subscriber cellular phone. Table 7 below shows data for calculating a moving speed of the vehicle.

time Latitude, longitude speed … … … 04-08-01-15: 00: 31 80.11, 100.11 50 Km / h 04-08-01-15: 00: 35 81.11, 101.41 60 Km / h 04-08-01-15: 00: 39 82.11, 101.21 58 Km / h … … …

The subscriber's cell phone can calculate the speed using the latitude, longitude difference and time difference between the two points. The time information may be obtained from a sync channel message received from the base station. In addition, the time information may be measured with a clock on the mobile phone.

FIG. 6 is a block diagram illustrating a preferred embodiment of the mobile phone of the present invention shown in FIG. 4, and includes a route information request unit 300, a navigation controller 304, a map database 306, and a traffic information provider ( 302, the vehicle progress information measuring unit 308.

When the cellular phone is used as the user's cellular phone, the route information request unit 300 transmits a route information request REQ1 including the start / end information of the vehicle movement determined by the user to the server. In addition, the route information request unit 300 receives the optimum route information DATA1 provided from the navigation server (not shown).

When the mobile phone is used as the user's mobile phone, the navigation control unit 304 matches the optimal route information 312 input through the route information requesting unit 300 with the geographic information 314 of the map database 306. To the user.

The map matching technique for matching the geographic information with the map database 306 may be implemented by various well-known methods. As an example, the technique disclosed in Korean Patent Laid-Open Publication No. 1999-58343 includes a first step of receiving a satellite signal from a GPS satellite to detect a position of a vehicle; A second step of determining whether a vehicle coordinate point corresponding to the position of the vehicle detected by the first step is located in an interpolation area of the road link; A third step of calculating a distance between the vehicle coordinate point and the interpolation points located in the interpolation area when the vehicle coordinate point is located in the interpolation area of the road link as a result of the determination of the second step; A fourth step of selecting an interpolation target point from an interpolation point having a minimum separation distance calculated in the third step; A fifth step of replacing the vehicle coordinate point detected by the first step with an interpolation target point selected by the fourth step; And a sixth step of following the driving trajectory of the vehicle after performing the fifth step.

The vehicle progress information measuring unit 308 provides the current progress state information 310 of the vehicle to the navigation control unit 304 and the traffic information providing unit 302.

The navigation controller 304 matches the current progress status information 310 of the vehicle obtained from the vehicle progress information measuring unit 308 with the geographic information 314 of the map database 306 to display a map display, voice guidance, and the like to the user. Can be provided through.

When the cellular phone is used as the subscriber cellular phone, the traffic information providing unit 302, according to the traffic information request (REQ2) received from the outside, the current progress status information 310 of the vehicle from the vehicle progress information measuring unit 308 ) Is transmitted to the outside as traffic information DATA2.

FIG. 7 is a block diagram illustrating an exemplary embodiment of the route information request unit shown in FIG. 6, and includes an operation unit 400, a route information request transmitter 401, and a route information receiver 402.

The operation unit 400 generates start / end point information 403 of vehicle movement by a user's manipulation. The operation unit 400 may be provided by a button input device, a touch screen, or the like for inputting information. The operation unit 400 may be operated by an input button provided in the mobile phone, or may be provided as a separate input device for navigation.

The route information request transmitter 401 modulates the route information request including the start / end point information 403 of the vehicle movement into a transmission signal and transmits the route information request signal REQ1. The route information request signal REQ1 is transmitted to the navigation server (not shown) through an external wireless network (not shown).

The route information receiver 402 receives the route information DATA1 provided from the navigation server (not shown) and demodulates the route information DATA1 into an internal signal 312 of the terminal.

FIG. 8 is a block diagram illustrating a preferred embodiment of the traffic information provider 302 shown in FIG. 6, and includes a traffic information request receiver 410, a location direction comparison unit 411, and a traffic information transmitter 412. It is provided.

When the cellular phone is used as the subscriber cellular phone, the traffic information providing unit 302, according to the traffic information request (REQ2) received from the outside, the current progress status information 310 of the vehicle from the vehicle progress information measuring unit 308 ) Is transmitted to the outside as traffic information DATA2. In this case, the traffic information provider 302 may be implemented to transmit the traffic information DATA2 only when it is determined that the subscriber cellular phone exists on the search path.

The traffic information request receiver 410 receives the traffic information request REQ2 from the outside and demodulates it as an internal signal 413 and outputs the demodulated signal. The traffic information request REQ2 may include information about a search route, start / end point direction information of the user vehicle, and the like. When the traffic information request REQ2 is received through the base station, it may include base station information in communication with the subscriber cell phone in addition to or instead of the information on the search path.

The position / direction comparison unit 411 compares the current progress information 310 of the vehicle with the information included in the traffic information request REQ2, and determines whether the information 414 is output. That is, the location direction comparison unit 411 may be implemented to output the information 414 only when it is determined that the traveling directions are the same and exist on the search path. The position / direction comparison unit 411 may not output the information when it is determined that the current position of the subscriber cell phone is not within the search path or when the current position is outside the tolerance range of the base station coordinates.

The traffic information transmitter 412 modulates the current progress status information 414 of the subscriber cell phone according to the determination result of the position / direction comparison unit 411 and outputs it as the traffic information DATA2.

FIG. 9 is a block diagram illustrating an exemplary embodiment of the vehicle progress information measuring unit illustrated in FIG. 6, and includes a GPS module 420, a position measuring unit 421, a speed measuring unit 422, and a direction measuring unit 423. ).

The vehicle progress information measuring unit 308 outputs the position information 425, the speed information 426, and the traveling direction information 427 as the vehicle current progress information 310.

The GPS module 420 receives GPS information from the GPS satellites.

The location measuring unit 421 generates the current location information 425 of the vehicle using the GPS information and the map database information 314.

In addition, the position measuring unit 421 may be implemented to measure the current position information 425 by using a differential global positioning system (DGPS).

The speed measuring unit 422 may generate a speed information 426 by inputting a signal from the vehicle speed measuring apparatus of the vehicle itself.

The speed measuring unit 422 may include various speed measuring devices such as a laser sensor, a microwave sensor, a wheel sensor, and a gravity (G) sensor to measure the speed.

However, each system has its drawbacks, and it takes time to install the sensor and it is inconvenient to connect with the battery of the car. Each system is also affected by the vehicle's attitude, the condition of the surface on which the sensor is mounted, moisture, vibration and various test conditions.

In addition, the speed measuring unit 422 measures a speed by measuring the Doppler effect of a GPS signal received from a GPS satellite, such as a VBOX or an equivalent thereof, developed by Racelogic of England and sold by M-tech. can do.

The direction measuring unit 423 may be implemented by a gyroscope or a magnetic compass, which is an absolute azimuth measuring means. In addition, the direction measuring unit 423 may generate the heading direction information 427 by calculating an amount of change in the measured latitude and longitude coordinates per hour.

In the embodiment of FIG. 9, the position measuring unit 421 measures the current position of the vehicle by the GPS module. In addition to the handset based technique using the GPS module, the wireless positioning technique includes network-based Angle of Arrival (AOA), Time of Arrival (TOA), and Time Difference of Arrival (TDOA). ) There is a way. Hereinafter, these position measuring methods will be briefly described.

In the AOA method, the two base stations measure the direction of the signal from the mobile phone to obtain an azimuth angle, and use the azimuth to find the position of the mobile phone. The direction of the signal measured by one base station forms one line of bearing (LOB), and the intersection of these direction angles becomes the location of the mobile phone. This is based on the two angles and the length of the sides of the triangle positioning method. That is, knowing the direction angle of the signal received by the two base stations and the distance between the two base stations can determine the position of the terminal. In the two-dimensional plane, the position of the mobile phone can be determined by only two direction angles, but in actual systems, three or more direction angles are used in consideration of accuracy.

According to the TOA method, the position of the mobile phone is obtained by calculating the distance according to the arrival time of radio waves emitted from three or more base stations.

According to the TDOA method, a propagation time difference is measured which is proportional to the difference between the distance between the two base stations serving as the signal sources and the mobile phone, and the mobile phone is positioned on a hyperbolic curve where the two base stations have a constant distance, that is, the two base stations are in focus. At this time, each base station should be synchronized, and time synchronization between base stations is performed by using a satellite clock. Through this, two hyperbolas are obtained from three base stations, and the intersection of the two hyperbolas is determined as the position of the receiver.

FIG. 10 is a block diagram illustrating another exemplary embodiment of the vehicle progress information measuring unit illustrated in FIG. 6, and includes a GPS module 420, a position measuring unit 421, a speed calculating unit 428, and a direction measuring unit 423. It is provided. Except for the speed calculator 428 in FIG. 10, the configuration is the same as that of FIG. 9.

The speed calculator 428 calculates the speed using the position measurement data 430 of the position measurer 421. That is, the speed calculator 428 may calculate the traveling speed information 429 by dividing the distance between the two locations measured by the location measuring unit 421 by the time difference between the two locations.

FIG. 11 is a block diagram for explaining a preferred embodiment of the navigation server 102 of the present invention shown in FIG. 4, which includes a route information providing unit 500, a route searching unit 506, a map database 504, A traffic information requesting unit 502 and an optimum path determining unit 508 are provided.

In the navigation system of the present invention, the navigation server 102 may provide optimal route information according to the request of the mobile phone 100, and may request the mobile phone 100 to provide traffic information.

The route information provider 500 demodulates the route information request REQ1 received from the outside, and extracts the start / end point information 510 from the route information request REQ1 and outputs it to the route search unit 506. In addition, the route information providing unit 500 modulates the determined optimal route information 516 and transmits it to the user's mobile phone (not shown) (DATA1).

The route search unit 506 inputs the city / end point information 510 and searches for and outputs a route 512 connecting the city / end point from the map database 504. The path can be searched in the form of links of several segments. The unit segment on the map may be determined, for example, by a predetermined distance unit, an intersection unit, or a traffic light unit. The path search unit 506 outputs searched path information 512 including the heading direction information.

The traffic information request unit 502 transmits the traffic information request signal REQ2 to a subscriber cell phone (not shown) through a wireless network (not shown). The traffic information request signal REQ2 may include the searched route information 512, and the route information may include information about a traveling direction. The traffic information requesting unit 502 also demodulates the traffic information DATA2 received from the outside, and extracts and outputs data 514 necessary for determining the optimum route therefrom. The data 514 may include coordinate information and speed information.

The optimal path determiner 508 determines and outputs the optimum path 516 from the searched path 518 by using the input information 514. The optimum path may be determined as the path having the fastest vehicle movement speed for each searched path. In particular, in the case of determining the optimum route in units of segments, the optimal route may be determined in the form of a link of the segment having the fastest vehicle moving speed among the segments existing on the found route. The vehicle moving speed can be calculated, for example, by an average value or the like.

FIG. 12 is a block diagram illustrating a preferred embodiment of the traffic information requesting unit 502 shown in FIG. 11, and includes a base station selecting unit 601, a vehicle call unit 600 on a route, and a vehicle coordinate receiving unit 602. And a vehicle selection unit 603, a traffic information request transmitter 604, and a traffic information receiver 605.

The base station selector 601 selects a base station covering the searched path and outputs coordinate information 606 of the base station. The base station coordinate information 606 may include travel direction information.

The vehicle call unit 600 on the path transmits a call signal REQ2-1 including base station coordinate information to a subscriber cell phone communicating with the base station.

The vehicle coordinate receiving unit 602 demodulates the coordinate information DATA2-1 of the subscriber's cellular phone received from the outside and outputs it as the terminal internal signal 607.

The vehicle selecting unit 603 inputs the coordinate information 607 of the subscriber's mobile phone from the vehicle coordinate receiving unit 602, selects the subscriber's mobile phone to request traffic information, and identifies the subscriber's mobile phone ID (ID, identification number) 608. Outputs The selection of the subscriber's mobile phone is determined according to the degree of matching between the searched route information 512 and the coordinate information 607 of the subscriber's mobile phone.

The traffic information request transmitter 604 modulates the ID of the selected subscriber cell phone and transmits the call signal REQ2-2.

The traffic information receiver 605 receives the traffic information DATA2 received from the subscriber's mobile phone, demodulates it as an internal signal 514 of the server for determining the optimum route, and outputs the demodulated signal. The traffic information DATA2 includes the speed of the subscriber's mobile phone. The traffic information DATA2 may further include time information.

The above-described mobile phone-based real-time on-demand navigation method according to the present invention can be embodied as computer readable codes on a computer readable recording medium. Computer-readable recording media include any type of recording device that stores programs or data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, hard disk, floppy disk, flash memory, optical data storage, and the like. Here, the program stored in the recording medium refers to a series of instruction instructions used directly or indirectly in an apparatus having an information processing capability such as a computer to obtain a specific result. Thus, the term computer is used to mean all devices having an information processing capability for performing a specific function by a program, including a memory, an input / output device, and an arithmetic device, regardless of the name actually used. The concept of the recording medium includes a case where the navigation method of the present invention is implemented as code that can be read and executed by a navigation server on the recording medium.

In addition, the above-described navigation method according to the present invention is an integrated circuit, for example, a field programmable gate array (FPGA), which is written on a computer by a schematic or ultra high-speed integrated circuit hardware description language (VHDL) or the like and connected to a computer. It can be implemented by. The recording medium includes such a programmable integrated circuit. In addition, the recording medium is a concept including an application specific integrated circuit (ASIC) that the method is implemented by an integrated circuit and can be embedded in a mobile phone.

The best embodiments have been disclosed in the drawings and specification above. The specific terms or numbers used herein are for the purpose of describing the present invention only and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the present invention collects the real-time traffic information according to the user's request by unifying the conventional dual traffic information collection and navigation system, from which the mobile phone base immediately reflects the dynamic changes in road conditions. Can provide navigation services.

According to the present invention, since the traffic information is collected from the mobile phones installed in all the navigation service subscriber vehicles, the shadowing time and the shadow area of the traffic information collection do not occur.

In addition, according to the present invention, the request and provision of traffic information are performed using an existing mobile phone multiplexing access method. Therefore, a low cost and efficient navigation service can be provided.

According to the present invention, it is possible to appropriately adjust the amount of traffic information required for navigation. Therefore, it is possible to solve the problem of increasing the processing load and traffic of the center caused by expanding the traffic information collecting area.

Claims (27)

(a) a mobile phone of a navigation service user vehicle (hereinafter referred to as a 'user cellular phone') transmitting time / end information of vehicle movement determined by the user to a navigation server (hereinafter referred to as a 'server'); (b) the server receives the time / end information and collects the current progress information of mobile phones (hereinafter referred to as subscriber phones) of the navigation service subscriber vehicle existing within the range corresponding to the time / end information. step; (c) determining, by the server, an optimal path for the time / endpoint using the collected current status information of the subscriber cellular phones; (d) the server transmitting the optimal path information to the user's mobile phone; And and (e) receiving, by the user mobile phone, the optimum path information and providing the user with the user. The method of claim 1, Current progress information of the subscriber cell phone is a mobile phone based real-time on-demand navigation method characterized in that it comprises the speed information of the subscriber cell phone. The method of claim 2, The current progress information of the subscriber mobile phone further comprises coordinate information of the subscriber mobile phone based real-time on-demand navigation method. The method of claim 2, The current progress state information of the subscriber cell phone further comprises a measurement time information of the speed information of the mobile phone based real-time on-demand navigation method. The method of claim 1, wherein in the step (b), the server, (b1) identifying a location on a map of the received city / endpoint information; (b2) searching for one or more paths connecting the time / endpoints; And (b3) collecting current progress information transmitted by subscriber cell phones which are present on the searched path and traveling in the same direction as the time / end point through the base station corresponding to the searched path; Mobile phone based real-time on-demand navigation method. The method of claim 5, wherein the path searched in the step (b2) Mobile phone based real-time on-demand navigation method characterized in that formed in the form of links of small segments. The method of claim 5, wherein after step (b3) The server further comprises the step of selecting a predetermined number of current progress information by the search path according to the degree of matching with the search path from the current progress information received from the mobile phone based mobile phone based real-time on Demand navigation method. The method of claim 5, wherein step (b3) The server transmitting base station information and direction information to the subscriber cellular phone; If the subscriber cellular phone communicating with the base station is determined to be within the coordinate information and tolerance range of the base station and is the same as the moving direction, transmitting the coordinate information of the subscriber cellular phone to the server; Selecting, by the server, a predetermined number of subscriber mobile phones according to the degree of matching of the coordinate information of the subscriber mobile phones with the search path, and requesting traffic information; And The mobile phone-based real-time on-demand navigation method comprising the step of transmitting the traffic information of the subscriber mobile phone request information to the server. The method of claim 8, The base station information and direction information, Cell phone-based real-time on-demand navigation method characterized in that transmitted by adding one or more fields to one or more messages included in an overhead message of the mobile phone multiplexed access method. The method of claim 8, The base station information and direction information, A mobile phone based real-time on-demand navigation method, which is transmitted by adding one or more messages in an overhead message of a mobile phone multiplexed access method. The method of claim 8, Coordinate information of the subscriber cell phone and the speed information of the subscriber cell phone And by adding one or more fields to one or more registration forms included in a registration message transmitted from the cellular phone to the base station. The method of claim 8, Coordinate information of the subscriber cell phone and the speed information of the subscriber cell phone Mobile phone based real-time on-demand navigation method characterized in that the transmission by adding one or more registration forms in the location registration message sent from the mobile phone to the base station. According to claim 2, wherein the speed information of the subscriber's mobile phone is Mobile phone based real-time on-demand navigation method characterized in that it is calculated by the time information and location information of the mobile phone. The method of claim 2, wherein in step (c) The server calculates the travel time for each of the searched routes, and determines a route whose time is calculated to be the smallest as the optimal route. The method of claim 14, The travel time for each route is calculated by dividing the total distance of each route by the average speed of subscriber phones for each route. The method of claim 1, wherein in step (e), The user mobile phone receives the optimal path information, and displays as a map to provide to the user on the mobile phone based real-time on-demand navigation method. The method of claim 1, wherein in step (e), And the user mobile phone receives the optimum route information and displays the best route information as road guidance voice information and provides the same to the user. Two or more mobile phones for designating a start / end point of the vehicle movement to request route information to receive route information from the outside, and to provide traffic information including current progress information of the vehicle in response to an external traffic information request; A navigation server configured to receive the traffic information from another mobile phone according to a request for route information of one mobile phone, determine an optimal route information using the traffic information, and provide the same to the mobile phone requesting the route information; Mobile phone based real-time on-demand navigation system characterized in that it comprises a base station for connecting the mobile phone and the navigation server. A map database storing geographic information; A route information request unit which transmits a route information request including route information on a start / end point of vehicle movement determined by a user to the outside and receives optimum route information provided from the outside; A vehicle progress information measuring unit measuring current progress state information of the vehicle; A navigation controller for guiding the progress of the vehicle to the user by using optimal path information provided from the outside; And A mobile phone for real-time on-demand navigation comprising a traffic information providing unit for providing the current progress information of the vehicle for transmitting the current progress information of the vehicle in response to a request for traffic information received from the outside. 20. The method of claim 19, wherein the vehicle progress information measuring unit A position measuring unit measuring a current position of the vehicle; A speed measuring unit measuring a traveling speed of the vehicle; And The mobile phone for real-time on-demand navigation, characterized in that it comprises a direction measuring unit for measuring the traveling direction of the vehicle. The method of claim 20, wherein the position measuring unit A mobile phone for real-time on-demand navigation comprising a GPS module for generating and outputting the current position information of the vehicle from the GPS information received from the GPS satellites. The method of claim 21, wherein the position measuring unit Mobile phone for real-time on-demand navigation, characterized in that for generating the current position information of the vehicle by the DGPS method. The method of claim 20, wherein the speed measuring unit The mobile phone for real-time on-demand navigation, characterized in that for calculating the traveling speed of the vehicle by dividing the distance between the two locations measured by the location measuring unit by the time difference measured the two locations. The method of claim 19, wherein the traffic information providing unit A traffic information request receiver configured to receive a traffic information request from an outside, demodulate it, and output the demodulated information; A position direction comparison unit for comparing the demodulated information with the current progress state information of the vehicle and outputting the current progress state information of the vehicle according to the comparison result; And A mobile phone for real-time on-demand navigation, characterized in that it comprises a traffic information transmitter for transmitting the current state information of the vehicle. A map database storing geographic information; Demodulating the route information request received from the outside, extracting and outputting time / endpoint information therefrom, modulating the input optimal route information and transmitting the route information to the outside; A route search unit for searching for and outputting a route connecting the city / end point from the map database by inputting the city / end point information; A traffic information request unit for modulating and transmitting the traffic information request signal including the found route information to the outside, and demodulating and outputting the traffic information received from the outside; And The navigation server for real-time on-demand navigation, characterized in that it comprises an optimum route determination unit for determining and outputting the optimum route from the searched route using the demodulated traffic information. The method of claim 24, wherein the traffic information request unit A base station selector which selects a base station covering the searched path and outputs coordinate information of the base station; A vehicle caller on a path for transmitting a call signal including the base station coordinate information to a subscriber cell phone communicating with the base station; A vehicle coordinate receiver configured to demodulate and output coordinate information of a subscriber's mobile phone received from the outside; A vehicle selection unit configured to input coordinate information of the subscriber's mobile phone, select a subscriber's mobile phone to request traffic information, and output identification information of the selected subscriber's mobile phone; A traffic information request transmitter which modulates identification information of the selected subscriber cellular phone and transmits it as a call signal; And And a traffic information receiver configured to demodulate and output traffic information received from the outside. A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 1 to 17.

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