Mobile communication system and method for registering location of a mobile terminal in the mobile communication system

• US 6,487,408 B1
• Filed: 08/23/1999
• Issued: 11/26/2002
• Est. Priority Date: 12/15/1994
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Tokuyoshi, Takaya
• Primary Examiner(s): CUMMING, WILLIAM D
• Application Number:
  US09/379,512
• Time in Patent Office: 1,191 Days
• Field of Search: 455/435, 455/433, 455/454, 370/333
• US Class Current: 455/435.1
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

A mobile terminal registration system is provided for a mobile communication system having a plurality of base stations making respective radio zones and a mobile terminal that moves in the radio zone and registers its location to the base stations. The mobile terminal comprises a location registration section for detecting reception levels of signals from the base stations, calculating a difference of the largest reception level and the second reception level and registering the mobile terminal location to a base station that transmits the largest reception level signal if the difference is larger than a threshold value.

Claims

1. A mobile communication system comprising:

a plurality of base stations, each of said base stations forming a radio zone;

a mobile terminal that moves in said radio zones and registers a location of said mobile terminal to one of said base stations, wherein said mobile terminal comprises location registration means for detecting reception levels of a plurality of different signals from said base stations, calculating a difference between a first one of said signals transmitted from a first one of said base stations having a largest reception level and a second one of said signals transmitted from a second one of said base stations having a second largest reception level and registering the location of said mobile terminal to said first base station having transmitted said first one of said signals having said largest reception level when said difference is larger than a preset threshold value; and

an exchange office connected with said base stations and for receiving location information of said mobile terminal via a base station to which the location of said mobile terminal has been registered and confirming the location of said mobile terminal, wherein said exchange office comprises location display means having a map indicating divisions of said base stations and for displaying the location of said mobile terminal in one of said divisions of said base stations based on a signal from said base station to which the location of said mobile terminal has been registered.

2. A mobile communication system comprising:

a plurality of base stations, each of said base stations forming a radio zone;

a mobile terminal that moves in said radio zones and registers a location of said mobile terminal to one of said base stations, wherein said mobile terminal comprises location registration means for detecting reception levels of signals transmitted from two of said base stations, calculating a difference between the reception levels and registering the location of said mobile terminal to one of said two base stations having transmitted a signal having a larger reception level when said difference is larger than a preset threshold value; and

an exchange office connected with said plurality of base stations and receiving location information of said mobile terminal via a base station to which the location of said mobile terminal has been registered and confirming location of said mobile terminal, wherein said exchange office comprises location display means having a map indicating divisions of said base stations and for displaying location of said mobile terminal in one of said divisions of said base stations according to a signal from said base station to which said location of said mobile terminal has been registered.

3. A method for registering a location of a mobile terminal in a mobile communication system comprising a plurality of base stations, each of said base stations makes a radio zone, and a mobile terminal that moves in a plurality of radio zones, in said mobile terminal, the method comprising steps of:

detecting a plurality of reception levels of a plurality of different signals transmitted from said base stations;

selecting a largest reception level and a second largest reception level from among detected reception levels;

calculating a difference between said largest reception level and said second largest reception level; and

registering the location of said mobile terminal to one of said base stations having transmitted a signal having said largest reception level when said difference is larger than a preset threshold value, wherein said step of registering the location further comprises steps of;

confirming whether the location of said mobile terminal has been registered to said base station having transmitted said signal having said largest reception level; and

registering the location of said mobile terminal to said base station having transmitted said signal having said largest transmitted level when location of said mobile terminal has not been registered to said base station having transmitted said signal having said largest transmitted level.