Automatic radio wave output limiting system for portable telephone set

• US 6,785,533 B2
• Filed: 10/05/2001
• Issued: 08/31/2004
• Est. Priority Date: 04/17/1998
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ezuriko, Hiroshi
• Primary Examiner(s): Cumming, William
• Application Number:
  US09/970,904
• Publication Number:
  US 20020019226A1
• Time in Patent Office: 1,061 Days
• Field of Search: 455/403, 455/26.1, 455/422, 455/436, 455/501, 455/450, 455/462, 455/422.1, 379/189
• US Class Current: 455/403
• CPC Class Codes: H04W 48/02 Access restriction performed under specific conditions
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

To provide a portable telephone system in which use of the portable telephone set is automatically limited in a site where the use of the set is limited and in which causes of non-response and other various information can be transmitted over a low power channel to a control device, for transmission to an originating party who called the use-limited portable telephone set. On reception of the output limiting command information from the control device, the portable telephone set enters into the output limiting mode to halt direct exchange with the base station and sends out the information on the fact that the set has entered into the output limiting mode and the information including the portable telephone set management number, telephone number reply message and a notification information flag to the control device, which then takes the place of the portable telephone set to reply to the call-out from the base station until the time the portable telephone set receiving the output limiting command exits the site.

Claims

1. A portable telephone set output limiting system comprising:

a portable telephone output limiting management device for transmitting a radio wave signal of an output limiting command limiting the outputting of a radio wave from the portable telephone set, said output limiting command being transmitted from a first antenna provided in a site where use of the portable telephone set is limited;

wherein

when the portable telephone set enters said site and receives said output limitation command from said first antenna, an output limiting mode is initiated to halt direct exchange between the portable telephone set and a base station, a state of the portable telephone set entering into the output halting mode and the information proper to the portable telephone set including a portable telephone set management number, a telephone number, a reply message if need be, communication information flag and incoming permission flag is sent to the portable telephone output limiting management device with a radio wave the transmission power of which is limited;

said portable telephone output limiting management device receiving the information proper to the portable telephone set sent out by the portable telephone set via said first antenna and using said information to update and register the contents of a management table of information for supervising portable telephone sets in said use-limited site;

said portable telephone output limiting management device setting the portable telephone set registered in said management table as a portable telephone set placed under its management;

there being provided a second antenna for having radio communication with the base station;

wherein, if there is an incoming call from the base station to a portable telephone set in the output limiting mode, reference is made to incoming permission information of said management table, said incoming permission information being provided from the information proper to the portable telephone set;

wherein, if the incoming call is shown by said incoming permission information as being permitted, the portable telephone set is advised of the incoming call and a message confirming that advice is transmitted to the base station for notification to the originating party.

2. The portable telephone set output limiting system as defined in claim 1 further comprising:

a repeater device provided in a use-permitted site for the portable telephone set, said repeater device effecting connection between the portable telephone set and the base station, and for accepting a radio channel of the portable telephone set placed under output limitation mode after a hand-over request from the portable telephone output limiting management device; and

means for transmitting to said base station a message to the effect that the portable telephone set is moving, said moving message being transmitted on acceptance by the portable telephone output limiting management device of a response from the portable telephone set in the output limited mode to an incoming call, said response being transmitted with a radio wave with a limited transmission power, until the time the user of the portable telephone set moves from the use-limited site to the use-permitted site;

wherein

if a pre-set response signal transmitted from said portable telephone set via a third antenna provided in the use-permitted site and which is connected to the portable telephone output limiting management device is received, said portable telephone set is verified to have moved to the use-permitted site, whereupon a command is issued, via a radio channel of an antenna connected to the repeater device, indicating the movement is halted and effecting hand-over to the repeater device.

3. A portable telephone set comprising:

means for limiting wireless communication with a base station, said portable telephone being put in an output-limited mode on reception of a predetermined output limiting command transmitted from a control device provided in a site where use of the portable telephone set is limited;

means for transmitting information to the control device in a low power transmission mode, said information being information proper to the portable telephone, and said transmission being responsive to said predetermined output limiting command,

wherein the information proper to the portable telephone set contains identification information of said portable telephone set, a portable telephone number, response message information and a communication information flag for specifying a response pattern with which a portable telephone output limiting management device is to reply to a call from a base station, said reply being in place of a reply from the portable telephone set.