Method and system for locating a mobile telephone within a mobile telephone communication network

• US 6,799,046 B1
• Filed: 06/10/1998
• Issued: 09/28/2004
• Est. Priority Date: 06/10/1998
• Status: Expired due to Term

• Current Assignee: Honor Device Company Limited
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Tang, Yuqiang
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): Taylor, Barry W
• Application Number:
  US09/095,170
• Time in Patent Office: 2,302 Days
• Field of Search: 455/67.1, 455/432, 455/425, 455/436, 455/437, 455/442, 455/440, 455/456, 455/457, 455/444, 455/449, 455/446, 455/456.1, 455/456.5, 455/456.6, 455/438, 455/456.2, 455/456.3, 342/457, 342/451
• US Class Current: 455/456.1
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

An improved method for locating a mobile telephone within a cellular telephone communication network is disclosed. The mobile telephone communication network has multiple cells, with each of the cells having a base station coupled to at least one antenna. A cell is initially divided into a number of sections. A location information and a signal information, such as a received signal strength indication, is then collected at each of the sections within the cell. The collected location information and signal information are subsequently processed into a signal information profile database. Utilizing the signal information profile database, the section within the cell at which a mobile telephone is located can be determined.

Claims

1. A method for locating a mobile telephone within a cellular telephone communication network having a plurality of cells, wherein each of said plurality of cells includes a base station coupled to at least one antenna, said method comprising the steps of:

dividing each entire individual cell into a plurality of sections using a set of substantially rectangular grids;

collecting location information and signal information at each of said plurality of sections within said cell for signals transmitted by said base station and other base stations located in cells adjacent to said cell;

processing said collected location information and said collected signal information into a signal information profile database; and

determining a section in which said mobile telephone is located utilizing said signal information profile database, wherein each entry within said signal information profile database includes a location information and an associated signal information of a section, wherein said determining further includes

receiving a mobile assisted hand-off signal from said mobile telephone;

calculating a difference between said mobile assisted hand-off signal and said collected signal information in each entry within said signal information profile database; and

selecting an entry within said signal information profile database having a minimum variance in said calculated step to provide a location information of a section in which said mobile telephone is located within said cellular telephone communication network.

2. The method according to claim 1, wherein said collecting step is performed by a drive test.

3. The method according to claim 1, wherein said signal information is a received signal strength indication.

4. A cellular telephone communication system capable of locating a mobile telephone within a cellular telephone communication network having a plurality of cells, wherein each of said plurality of cells includes a base station coupled to at least one antenna, said cellular telephone communication system comprising:

means for dividing each entire individual cell into a plurality of sections using a set of substantially rectangular grids;

means for collecting location information and signal information at each of said plurality of sections within said cell for signals transmitted by said base station and other base stations located in cells adjacent to said cell;

means for processing said collected location information and said collected signal information into a signal information profile database; and

means for determining a section in which said mobile telephone is located utilizing said signal information profile database, wherein each entry within said signal information profile database includes a location information and an associated signal information of a section, wherein said means for determining further includes

means for receiving a mobile assisted hand-off signal from said mobile telephone;

means for calculating a difference between said mobile assisted hand-off signal and said collected signal information in each entry within said signal information profile database; and

means for selecting an entry within said signal information profile database having a minimum variance in said calculated step to provide a location information of a section in which said mobile telephone is located within said cellular telephone communication network.

5. The mobile telephone communication system according to claim 4, wherein said collecting means is a drive test.

6. The mobile telephone communication system according to claim 4, wherein said signal information is a received signal strength indication.

7. A computer program product for locating a mobile telephone within a cellular telephone communication network having a plurality of cells, wherein each of said plurality of cells includes a base station coupled to at least one antenna, said computer program product comprising:

program code means for dividing each entire individual cell into a plurality of sections using a set of substantially rectangular grids;

program code means for collecting location information and signal information at each of said plurality of sections within said cell for signals transmitted by said base station and other base stations located in cells adjacent to said cell;

program code mean for processing said collected location information and said collected signal information into a signal information profile database; and

program code means for determining a section in which said mobile telephone is located utilizing said signal information profile database, wherein each entry within said signal information profile database includes a location information and an associated signal information of a section, wherein said program code means for determining further includes

program code means for receiving a mobile assisted hand-off signal from said mobile telephone;

program code means for calculating;

a difference between said mobile assisted hand-off signal and said collected signal information in each entry within said signal information profile database; and

program code means for selecting an entry within said signal information profile database having a minimum variance in said calculated step to provide a location information of a section in which said mobile telephone is located within said cellular telephone communication network.

8. The computer program product according to claim 7, wherein said program code means for collecting means further includes a program code means for performing a drive test.

9. The computer program product according to claim 7, wherein said signal information is a received signal strength indication.