Patent Application
20080095096
The above and other objects and features of the present invention will become apparent from the following description of the preferred embodiments given in conjunction with the accompanying drawings, in which:
Other objects and aspects of the invention will become apparent from the following description of the embodiments with reference to the accompanying drawings, which is set forth hereinafter. Thus, the technical concept of the present invention can be easily embodied by those skilled in the art. If any further description on widely known technology related to the present invention is determined to blur the point of the present invention, the description is omitted. Hereafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
As shown, the geographic information transceiving system using a digital broadcasting network includes a map and geographic information server 110, a digital broadcasting network 130 and a digital broadcasting receiver (now shown). The map and geographic information server 110 collects recent map and geographic information and transmits it to the digital broadcasting network 130.
The digital broadcasting network 130 transmits data transmitted from the map and geographic information server 110 to a region to which the navigation service is provided.
The digital broadcasting receiver (now shown) receives geographic information from the digital broadcasting network 130 and converts the geographic information into navigation information to be used by a user.
Here, the digital broadcasting network 130 includes a broadcasting station 120, a plurality of geographic information multiplexers 141 to 143, and transmitting sites 131 to 133. The broadcasting station 120 transmits data collected and processed by the map and geographic information server 110 to transmitters in conformity to output broadcast signals. The plurality of geographic information multiplexers 141 to 143 multiplex signals outputted from the broadcasting station 120 with local geographic information. The transmitting sites 131 to 133 transmit the signals multiplexed in the geographic information multiplexers 141 to 143 to the digital broadcast receiver.
The data collected and processed by the map and geographic information server 110 are transmitted to the broadcasting station 120 of the digital broadcasting network 130. The broadcasting station 120 transmits the processed data to the transmitting sites 131 to 133 in conformity to output broadcast signals for each transmitter. The transmitting sites 131 to 133 multiplex them with local geographic information by using the geographic information multiplexers 141 to 143 and then transmit the multiplexed signals. The digital broadcast receivers, which are scattered in each region, receive the map and geographic information transmitted from the transmitting sites 131 to 133 and apply it to navigation or local geographic information. Here, the digital broadcast receivers are not shown in
That is,
As shown, the map and geographic information server 110 includes a geographic information collector 210, a geographic information processor 220, the broadcasting station 120, the geographic information multiplexers 141 to 143, and the transmitting sites 131 to 133.
The geographic information collector 210 receives real-time traffic information and real-time geographic information from a central or local geographic information collecting network and collects geographic information and traffic information. The geographic information processor 220 extracts and processes local geographic information and local traffic information from the geographic information collector 210 and outputs entire region information, geographic information for each resolution, and traffic information for each resolution. The broadcasting station 120 converts the geographic information data and the local information data inputted from the geographic information processor 220 into data that conform to digital broadcast signals and performs transmission. The geographic information multiplexers 141 to 143 multiplex the geographic information data and the local information data transmitted from the broadcasting station 120 with local geographic information. The transmitting sites 131 to 133 transmit the geographic information data and the traffic information data which are multiplexed in the geographic information multiplexers 141 to 143 to a region corresponding to the data.
The map and geographic information server 110 of the present invention which has the above-mentioned structure is operated as follows.
The map and geographic information server 110 processes new data and provides the processed data to the broadcasting station 120 as soon as the new data are obtained so that the broadcasting station 120 could add the new data to information sent out to each region. Here, the processed geographic information are provided in several versions of map data having a different file size based on significances of the processed geographic information and map resolutions. When broadcasting station 120 receives geographic information from the map and geographic information server 110, it re-establishes the multiplexing structure of an existing geographic information broadcasting channel to send out new map data to the transmitting sites 131 to 133 based on a predetermined map division standard. Here, the broadcasting station 120 selects a proper map out of the map data having diverse file sizes, which are made in the map and geographic information server 110, in consideration of broadcasting conditions and the size of a broadcasting data channel, multiplexes the map data and adds them to broadcast signals, and transmit the resultant signals to the transmitting sites 131 to 133.
As shown, the digital broadcast receiver of the geographic information transceiving system, which is described in the present invention, includes a tuner 301, a demodulator 302, a demultiplexer 303, a data decoder 304, a memory 305, a map data manager 306, a navigation/display unit 307 and an audio/video (A/V) controller 308.
The tuner 301 selects and synchronizes signals outputted from the transmitting sites 131 to 133. The demodulator 302 demodulates the signals outputted from the tuner 301. The demultiplexer 303 demultiplexes the demodulated signals outputted from the demodulator 302. The data decoder 304 decodes the demultiplexed signals outputted from the demultiplexer 303. The memory 305 stores the decoded data outputted from the data decoder 304. The map data manager 306 manages the data stored in the memory 305 and displays a requested part. The navigation/display unit 307 displays map data under the control of the map data manager 306 and performs navigation. The audio/video (A/V) controller 308 controls and outputs audio/video data among the data outputted from the demultiplexer 303.
The digital broadcast receiver has a memory 305 with a capacity sufficient to store map data of at least three regions to receive and store all the data of the regions at a boundary point on the map.
The map data manager 306 performs a function of combining map data, which are decoded in each receiving module and stored in the memory 305, without cut-off at boundary points and displays a requested part on the navigation/display unit 307.
Map and geographic information data has data that are updated frequently and data that are rarely upgraded. Geographical names and location coordinates of a particular spot are those upgraded frequently. Therefore, if the map data to be transmitted are classified and a carousel period is adjusted, they can be transmitted more effectively.
If the digital broadcast receiver receives a local map for a certain level of resolution which is outputted from the geographic information processor 220 and the resolution of the received map is higher than that of an existing map (which means the received map is more elaborate than the existing one), the digital broadcast receiver replaces the existing map with the new one or upgrades the changed part.
Also, among the data that are rarely changed, data such as segment numbers of a map, location information and location coordinates of a particular point, are not upgraded frequently. If these data are saved in the memory 305 during the manufacturing of the digital broadcast receiver, they can be used usefully for setting up the location of a destination point on a map in a long-distance vehicle navigation because the location is already saved in the memory 305. In short, in a navigation apparatus, the current location becomes a departure point and a destination is designated by searching a geographical name saved in the memory 305 in advance or an area around the destination. If the destination is a place already saved in the memory 305, a navigation service is provided directly by using the map in the memory 305. Otherwise, if the destination is a far-away place not saved in the map of the memory 305, the navigation apparatus first finds out and presents a best place for going to the destination within the map saved in the memory 305 and then, when it arrives at the place, it downloads a map of the region and finds out the best route for the next destination to go the final destination instantly.
As shown, data that correspond to the entire region and has little variation are sent out in a relatively long time period and data that are changed and used frequently such as traffic data are generated and transmitted rather frequently.
Each transmitter transmits broadcast signals from the broadcasting station to its broadcasting coverage.
Basically, once the digital broadcast receiver receives map data, it stores the map data in the memory 305 as shown in the digital broadcast receiver of
If the stored map data exceed the proper capacity level, the digital broadcast receiver manages the memory 305 by deleting the stored map data for the region where the digital broadcast receiver is located or from those with the lowest usage frequency.
When two map segments are received from two adjacent transmitting sites, the margins of the two map segments should be overlapped in order to make no empty space appear on the map received by the receiver. The value can be determined as a multiplication of the maximum speed of the mobile station (i.e., vehicle) by a time consumed to receive all map data of the lowest resolution in the region. By doing so, map data of the region can be received before the receiver or the receiving vehicle enters the new region. Here, the time for receiving map data from a transmitting site goes in proportion to the size (resolution or the amount of information) of the map data for the region.
As shown, the current location becomes a departure point and a destination point is determined by searching the name of the destination which is stored in the memory 305 in advance or by searching the area near the destination point. If the destination point is in the map stored in the memory 305, the navigation service is provided by using the map. Otherwise, if the destination point is a far-away place, the best place of the map for going to the destination point is presented. Then, when the vehicle arrives in the place, it downloads a map of the region and finds out the best route for the next destination to go to the final destination instantly.
At step S701, real-time geographic information and local geographic information are collected from the central or local geographic information collecting network. At step S702, the collected information is processed into entire region information and geographic information for several resolutions and, at step S703, the processed information to the broadcasting station.
At step S704, the data transmitted to the broadcasting station are multiplexed in conformity to the output broadcast signals of each transmitting site.
Subsequently, at step S705, the data are encrypted during multiplexing and whether to allow a user to use the information is determined based on whether the receiver is a subscriber and what subscriber class the receiver belongs to.
Here, at step S706, if the transmitting site transmits the signals from the broadcasting station to the receiver, at step S707, the receiver performs synchronization, demodulation, demultiplexing and decoding. At step S708, the receiver performs decryption by determining whether to allow the use of the data based on whether the receiver is a subscriber and what subscriber class it belongs to during decoding, and stores the decrypted data in the memory. At step S709, the stored data are applied to the navigation service.
As described above, the method of the present invention can be embodied in the form of a program and stored in a computer-readable recording medium, such as CD-ROM, RAM, ROM, floppy disks, hard disks, magneto-optical disks and the like. Since this process can be easily performed by those of ordinary skill in the art, it will not be described herein.
The technology of the present invention can overcome a problem of performing map upgrade in the receiver whenever there are data to be upgraded by segmenting new map data on the map and geographic information of a nation or a local area, on which the navigation service is provided, into an appropriate size based on the number and distance of digital broadcast transmitting sites and transmitting the segment map data through transmitters. Since the receiving part receives the new map data through a digital broadcast receiver and uses the updated map by combining map segments. Therefore, the memory capacity of the receiver can be reduced or the amount of information to be transmitted to the receiver can be increased.
While the present invention has been described with respect to certain preferred embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2003-0098407 | Dec 2003 | KR | national |
| 10-2004-0037919 | May 2004 | KR | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/KR04/02336 | 9/14/2004 | WO | 00 | 6/26/2006 |
