Title:
SATELLITE COMMUNICATION SYSTEM PROVIDED WITH FUNCTION OF MONITORING AND CONTROLLING USER'S EXPOSURE TO RF
Document Type and Number:
Japanese Patent JPH0969807
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method and system for measuring power density in the antenna of a user terminal from closed loop power control information by means of a gateway. SOLUTION: When the gateway 18 judges that power density exceeds a threshold while connection is maintained, connection is terminated before the average transmission power density level of the user terminal 13 exceeds a prescribed threshold level and an absolute threshold level. A heating or visual indicator gives an alarm that present connection is to be terminated soon to a user. In an off period when telephone is inhibited, only the prescribed type of telephone call such as emergency telephone is permitted. A power density monitor function is provided in the user terminal and information is transmitted to the gateway through a return link 17B. A majority decision and other technology is used by the gateway before connection is terminated. In such a case, power density measurement executed in the gateway is given priority and the user terminal is prevented from intentionally or suddenly stopping the power density monitor function.
Inventors:
WIEDEMAN ROBERT A (US)
MONTE PAUL A (US)
SITES MICHAEL J (US)
MONTE PAUL A (US)
SITES MICHAEL J (US)
Application Number:
JP18452596A
Publication Date:
March 11, 1997
Filing Date:
July 15, 1996
Export Citation:
Assignee:
GLOBALSTAR LP (US)
International Classes:
H04B7/00; H04B7/185; G01R29/08; H04B7/216; (IPC1-7): H04B7/00; G01R29/08
Attorney, Agent or Firm:
Fujihiko Motohiko