Telecommunications – Radiotelephone system – Security or fraud prevention
Reexamination Certificate
1997-09-12
2001-02-13
Hunter, Daniel S. (Department: 2749)
Telecommunications
Radiotelephone system
Security or fraud prevention
C455S063300, C455S422100, C455S522000
Reexamination Certificate
active
06188883
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a Cellular type mobile communication system. More specifically, the present invention relates to a communication control method in a base station and a mobile station of Cellular type mobile communication system suitable for an area desired to suppress electromagnetic wave signals, such as an area of a medical institution using medical electronic equipment.
2. Description of the Related Art
Conventionally, in the Cellular type mobile communication system of the type, to which the present invention concerns, areas, in which suppression of electromagnetic wave noise is desired, are preliminarily notified to users of mobile stations, such as portable telephone or cellular phone, by document or the like, and use of the mobile station is restricted in such area. Thus, conventionally, restricting transmission in the area desired to restrict electromagnetic wave noise is done relying on own judgment of the user of the mobile station.
However, in the system controlling communication relying on own judgment of the user of the mobile station, restriction effect cannot be satisfactorily achieved in the area where suppression of electromagnetic wave noise is desired, including medical institution using medical electronic equipment easily influenced by the electromagnetic wave noise.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a Cellular type mobile communication system which can affirmatively control use of a mobile station in an area where suppression of electromagnetic wave noise is desired.
The present invention is directed to a Cellular type mobile communication system. According to the present invention, a communication restriction command code for restricting a communication of a mobile station is added to a base station identification code transmitted from a base station covering an area where suppression of an electromagnetic wave noise is desired. Transmission of the mobile station is restricted by receiving the communication restriction command code added to the base station identification code when the mobile station is located within the area desired to suppress electromagnetic wave noise.
In this case, the communication restriction command code may be an identification code indicative whether the mobile station is enabled or disabled transmission.
On the other hand, transmission of the mobile station is controlled so that the mobile station receiving the base station identification code including the communication restriction command code interrupts transmission, or, makes transmission power to be smaller than that of normal transmission power.
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K. Weiss et al., “Conventional Local Area Radio Coverage System” (Motorola Technical Developments, vol. 13, Jul., 1991, pp. 67-69.
Foley & Lardner
Hunter Daniel S.
NEC Corporation
Nguyen Thuan T.
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