Patent ID: 7336929
Filing Date: 2008-02-26
Classification: G08B,H04B

Abstract:
1. A short-range wireless communication system comprising a portable terminal apparatus having a short-range wireless communication facility, and a wireless communication apparatus capable of wirelessly communicating with said portable terminal apparatus at close range, one of the two apparatuses monitoring a signal level of a wireless signal transmitted by the other apparatus so that if said signal level drops below a predetermined threshold, said one apparatus requesting said other apparatus to increase transmission power, wherein said portable terminal apparatus limits use of predetermined functions thereof if said signal level of said wireless signal from said wireless communication apparatus at close range drops so low that a state of short-range wireless connection with said wireless communication apparatus cannot be maintained; said short-range wireless communication facility of said portable terminal apparatus and said wireless communication apparatus move into a particular operation mode if short-range wireless communications do not take place therebetween at least for a predetermined time period; and when said signal level of said wireless signal from said other apparatus is monitored by said one apparatus in said particular operation mode, a response speed at which to detect a level change in said wireless signal is reduced.