Location-based services
A technology of a service system and a data processing device, applied in the field of location-based service systems, can solve problems such as being expensive and difficult to implement, and achieve the effects of reduced processing requirements, high-level security, and simple verification process
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[0038] figure 1 A road toll system to which the present invention can be applied is shown.
[0039] GPS data is captured by GPS receiver 1 . Decode this data into location data (longitude-latitude). The position data is stored together with timing (clock) data in a memory 2 in the form of a smart card. Periodically send a batch of stored data to the back-end road toll server 4, as shown in batch download 6. Ideally, this would be done over GSM functionality (General Packet Radio Service "GPRS" or third generation mobile telephony "3G") using a cellular modem 8 . The backend server is able to reconstruct the distance traveled from this data.
[0040] The server 4 also contains a database of road prices which are valid at a particular time. Finally, the total price is calculated and the driver gets the list (eg, by month).
[0041] In order to prevent the data from being tampered by the user, the data is exchanged cryptographically (eg DES or 3DES) between the GPS decoder ...
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