Cellular type mobile communication system that provides communication restriction command codes along with base station ID codes for base stations where mobile communications is restricted

• US 6,188,883 B1
• Filed: 09/12/1997
• Issued: 02/13/2001
• Est. Priority Date: 09/13/1996
• Status: Expired due to Fees

• Current Assignee: NEC Electronics Corporation (Renesas Electronics Corporation)
• Original Assignee: NEC Corporation
• Inventors: Takemura, Narihira
• Primary Examiner(s): Hunter, Daniel S.
• Assistant Examiner(s): Nguyen, Thuan T.
• Application Number:
  US08/928,341
• Time in Patent Office: 1,250 Days
• Field of Search: 455/411, 455/66, 455/62, 455/432, 455/435, 455/517, 455/522, 455/422, 455/63
• US Class Current: 455/411
• CPC Class Codes: H04W 48/04 based on user or terminal location or mobility data, e.g. moving direction, speed
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A communication restriction command code for a mobile station is added to a base station identification code transmitted from the base station. When the mobile station is positioned within an area desired to suppress electromagnetic wave signals, the base station identification code including the communication restriction command code is received to interrupt transmission or reduce transmission power to be smaller than normal transmission power to perform communication control for restricting transmission of the mobile station.

Claims

1. A Cellular mobile communication system in which by adding a communication restriction command code for restricting transmission of a mobile station to a base station identification code transmitted from a first base station covering an area where suppression of an electromagnetic wave signal is desired, transmission of said mobile station is restricted by receiving said communication restriction command code added to said base station identification code when said mobile station is located within the area desired to suppress the electromagnetic wave signal,

wherein transmission of said mobile station is restricted in the area covered by the first base station based solely on non-cellular equipment being located in the area covered by the first base station in which it is desired to suppress the electromagnetic wave signal of said mobile station, and

wherein, when said mobile station is located in a region that includes the area covered by the first base station and a second area that is covered by a second base station in which transmission restriction is not to be performed, said mobile station receives a first ID code from the first base station and the communication restriction command code from the first base station, as well as a second ID code from the second base station, and wherein said mobile station is still restricted from transmitting when the mobile station receives the communication restriction command code from the first base station but not from the second base station.

4. The method as set forth in claim 1, wherein the single preset transmission level is set based on information included in the at least one transmission restriction command received by the mobile station.

2. A method for restricting transmissions in a Cellular mobile communication system, comprising:

a) receiving, by a mobile station, identifiers from all base stations within a reception range of the mobile station, each base station having a corresponding coverage cell;

b) determining, by the mobile station, if any of the received identifiers also include a transmission restriction command; and

c) if the determination made in step b) is that at least one transmission restriction command has been received by the mobile station, performing restriction of mobile communications by the mobile station,

wherein the restriction is performed in step c) irrespective as to whether or not a corresponding identifier from another base station in which transmission restriction is not required has been received in step a).

3. The method as set forth in claim 2, wherein the restriction in step c) corresponds to allowance of transmissions by the mobile station only below a single preset transmission level.

5. The method as set forth in claim 2, wherein the determination made in step b) is performed every time the mobile station initiates transmission or upon hand over for selection of a particular base station to be switched to, and

wherein the mobile station performs the selection during the hand over.

6. The method as set forth in claim 2, wherein step a) is performed by the mobile station during initialization of transmission over the Cellular mobile communication system, the method further comprising:

d) during a handover in which the mobile station moves from a first area controlled by a first base station to a second area controlled by a second base station in which communications restriction is required, the mobile station is only allowed to receive communications in the second area, when previously the mobile station was allowed to both transmit and receive communications in the first area.

7. The method as set forth in claim 6 wherein, when the mobile station moves from the second area to a third area controlled by a third base station in which communications restriction is not required, the mobile station is allowed to both transmit and receive communications in the third area.