POSITION INFORMATION SERVICE SYSTEM, POSITION INFORMATION USING METHOD POSITION INFORMATION SERVICE SYSTEM, ORIGINATING TERMINAL, POSITION CENTER, AND TERMINATING TERMINAL

Japanese Patent JP3642253

B2

PROBLEM TO BE SOLVED: To provide a position information service system which makes the ID of an originating terminal secret to the outside of an exchange network, provides information at a request from a terminating terminal unlimited to a special number, and charges the terminal on a renotification non-charging basis.
SOLUTION: To cipher position information by using a key which is updated at intervals of unit time, the originating terminal generates a work key for ciphering by using the update time and information identifying a sender and ciphers the position information by using the work key for ciphering and a terminating terminal number. The terminating terminal caches corresponding position information and ciphered position information in pairs and acquires ciphered position information from a position center if no cache hit is made. The terminating terminal is charged at a request to decipher which is sent to the position center. The cache is cleared in the timing of the update of the unit time.

Ryuta Masuda
Shigeru Date
Kenji Yasunaga
Shinichi Mine

JP2000081964A

April 27, 2005

March 23, 2000

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Nippon Telegraph and Telephone Corporation

G01C21/00; G09C1/00; H04L9/08; H04L9/32; H04M3/42; H04M11/00; H04M15/00; H04M15/08; H04M17/00; H04W4/02; H04W8/14; H04W88/14; (IPC1-7): H04M3/42; G09C1/00; H04L9/08; H04M11/00; H04Q7/38

JP2000004482A
JP9018588A
JP8195741A
JP2000078667A
JP10301491A

Tadahiko Ito

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