2003-284123 is referenced by 5 patents.

PROBLEM TO BE SOLVED: To provide a positional information terminal capable of preventing wasteful consumption of time and communication charge for position detection.SOLUTION: The positional information terminal is provided with a reception state discrimination section 15 for discriminating the reception state of a mobile communication section 14. The reception state discrimination section 15 discriminates that the positional information terminal is resident in a suburb or in a mountainous area when the number of base stations with which the mobile communication section 14 can communicate is smaller than the predetermined number, or discriminates the positional information terminal is resident in an urban area when the number of base stations with which the mobile communication section 14 can communicate is equal to or greater than the predetermined number. When the reception state discrimination section 15 discriminates that the positional information terminal is resident in the urban area and the positional detection by the GPS has failed, the position detection using a mobile communication means is performed.

Title
Positional information terminal
Application Number
2002-081855
Publication Number
2003-284123
Application Date
March 22, 2002
Publication Date
October 3, 2003
Inventor
Kawamoto Kazuhiro
Koyama Masaki
Okuno Kenji
Kuramae Kenji
Tsujimoto Ikuo
Sakamoto Koji
Suefuji Takuya
Yamada Wakio
Suzuki Junichi
Satake Tei
Fukuda Masahito
Assignee
Matsushita Electric Works
IPC
G01S 05/14
H04Q 07/34