Meng F Yee

US Patent:

6424834, Jul 23, 2002

Filed:

Jul 31, 1999

Appl. No.:

09/365262

Inventors:

Meng Yee - Richardson TX

Assignee:

Nortel Networks Corporation - Montreal

International Classification:

H04Q 720

US Classification:

455436, 455439

Abstract:

A method and system for providing a precision hard handoff between two networks is disclosed. The two networks include a first wireless communication system for serving a defined area, such as a campus, at a first frequency and a second wireless communication system adjacent to the first system and operating at a second frequency. A first pilot beacon distributor is positioned at a transition point of the campus for directionally transmitting a first pilot beacon signal into the campus. When a mobile unit operating on the second frequency crosses the transition point into the campus, it receives the first pilot beacon signal and it shifts operation to the first frequency.

US Patent:

6621811, Sep 16, 2003

Filed:

Jul 31, 1999

Appl. No.:

09/364985

Inventors:

Meng Yee - Richardson TX

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04B 7216

US Classification:

370342, 370335, 370491, 370500, 370331, 345422, 345447, 345449, 345454

Abstract:

A method and system for producing a plurality of pilot beacon signals with different carrier frequencies is disclosed. One original pilot beacon signal is first obtained, and a splitter is used to make copies of the pilot beacon signal. Each of the copies are fed into a mixer for generating a plurality of intermediate signals with different frequencies. A bandpass filter is subsequently used to select a final one among the intermediate signals. Thus, a set of pilot beacon signals with different frequencies are successfully obtained.

US Patent:

59831065, Nov 9, 1999

Filed:

Dec 18, 1996

Appl. No.:

8/768450

Inventors:

Charles P. Bernardin - Richardson TX
Meng F. Yee - Richardson TX

Assignee:

Nortel Networks Corporation - Montreal

International Classification:

H04Q 720

US Classification:

455446

Abstract:

A robust method for determining the boundaries of cells and the associated reliability of the RF coverage within these boundaries is presented. The invention accurately determines the average range from the base station to the cell edge from RF signal strength measurements with a linear regression approach. The accuracy of this estimate is quantified both as a range uncertainty (e. g. . +-. 100 meters) and as a cell coverage reliability (i. e. area/edge) through 1) simulation, 2) analysis of real data, and 3) theoretical analysis. It is shown that if the estimate of the cell radius meets the desired accuracy, then the corresponding estimates of coverage reliability (both area and edge) are more than sufficiently accurate. It is recommended that radio survey analyses incorporate this test as part of the coverage validation process.

US Patent:

61731854, Jan 9, 2001

Filed:

Dec 18, 1996

Appl. No.:

8/768493

Inventors:

Charles P. Bernardin - Richardson TX
Meng F. Yee - Richardson TX

Assignee:

Northern Telecom Limited - Montreal

International Classification:

H04Q 720

US Classification:

455446

Abstract:

A robust method for determining the boundaries of cells and the associated reliability of the RF coverage within these boundaries is presented. The invention accurately determines the average range from the base station to the cell edge from RF signal strength measurements with a linear regression approach. The accuracy of this estimate is quantified both as a range uncertainty (e. g. . +-. 100 meters) and as a cell coverage reliability (i. e. area/edge) through 1) simulation, 2) analysis of real data, and 3) theoretical analysis. It is shown that if the estimate of the cell radius meets the desired accuracy, then the corresponding estimates of coverage reliability (both area and edge) are more than sufficiently accurate. It is recommended that radio survey analyses incorporate this test as part of the coverage validation process.

US Patent:

60060956, Dec 21, 1999

Filed:

Dec 18, 1996

Appl. No.:

8/768714

Inventors:

Charles P. Bernardin - Richardson TX
Meng F. Yee - Richardson TX

Assignee:

Nortel Networks Corporation - Montreal

International Classification:

H04Q 720

US Classification:

455446

Abstract:

A robust method for determining the boundaries of cells and the associated reliability of the RF coverage within these boundaries is presented. The invention accurately determines the average range from the base station to the cell edge from RF signal strength measurements with a linear regression approach. The accuracy of this estimate is quantified both as a range uncertainty (e. g. . +-. 100 meters) and as a cell coverage reliability (i. e. area/edge) through 1) simulation, 2) analysis of real data, and 3) theoretical analysis. It is shown that if the estimate of the cell radius meets the desired accuracy, then the corresponding estimates of coverage reliability (both area and edge) are more than sufficiently accurate. It is recommended that radio survey analyses incorporate this test as part of the coverage validation process.

US Patent:

60412364, Mar 21, 2000

Filed:

Dec 18, 1996

Appl. No.:

8/769690

Inventors:

Charles P. Bernardin - Richardson TX
Meng F. Yee - Richardson TX

Assignee:

Nortel Networks Corporation - Richardson TX

International Classification:

H04Q 722

US Classification:

455446

Abstract:

A robust method for determining the boundaries of cells and the associated reliability of the RF coverage within these boundaries is presented. The invention accurately determines the average range from the base station to the cell edge from RF signal strength measurements with a linear regression approach. The accuracy of this estimate is quantified both as a range uncertainty (e. g. . +-. 100 meters) and as a cell coverage reliability (i. e. area/edge) through 1) simulation, 2) analysis of real data, and 3) theoretical analysis. It is shown that if the estimate of the cell radius meets the desired accuracy, then the corresponding estimates of coverage reliability (both area and edge) are more than sufficiently accurate. It is recommended that radio survey analyses incorporate this test as part of the coverage validation process.

US Patent:

59666617, Oct 12, 1999

Filed:

Dec 18, 1996

Appl. No.:

8/768713

Inventors:

Charles P. Bernardin - Richardson TX
Meng F. Yee - Richardson TX

Assignee:

Nortel Networks Corporation - Montreal

International Classification:

H04Q 720

US Classification:

455446

Abstract:

A robust method for determining the boundaries of cells and the associated reliability of the RF coverage within these boundaries is presented. The invention accurately determines the average range from the base station to the cell edge from RF signal strength measurements with a linear regression approach. The accuracy of this estimate is quantified both as a range uncertainty (e. g. . +-. 100 meters) and as a cell coverage reliability (i. e. area/edge) through 1) simulation, 2) analysis of real data, and 3) theoretical analysis. It is shown that if the estimate of the cell radius meets the desired accuracy, then the corresponding estimates of coverage reliability (both area and edge) are more than sufficiently accurate. It is recommended that radio survey analyses incorporate this test as part of the coverage validation process.