Method and system for handoff between an asynchronous CDMA base station and a synchronous CDMA base station

US6246673A · kind A · utility

Assignee

• QUALCOMM Incorporated · US

Inventors

• Edward G. Tiedemann, Jr. · San Diego, US
• Daisuke Terasawa · San Diego, US
• Sandip Sarkar · San Diego, US
• Yu-Cheun Jou · San Diego, US
• Joseph P. Odenwalder · Rancho Santa Fe, US
• Abihijit Shanbhag · San Diego, US
• Serge Willenegger · Onnens, CH

Key dates

• Filing date: Feb 25, 2000
• Grant date: Jun 12, 2001
• Expiry date: Feb 25, 2020

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04J3/0682
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A method and system that enables faster acquisition of the forward link signal of a target base station in a mixed network of synchronous and asynchronous base stations is disclosed. The serving base station transmits in a neighbor list an estimated timing error 417 between the serving base station and a target base station. By utilizing the timing information, a mobile station estimates the relative time offset 408 between forward link signals received from the serving base station and signals received from the target base station. Timing information acquired during handoff enables accurate updating of the estimated timing error 417 subsequently transmitted in the neighbor lists by the base stations.