Patent ID: 7254118
Filing Date: 2007-08-07
Classification: H04B,H04W

Abstract:
1. A method for a soft handoff operation in a CDMA communication system, comprising: transmitting data frames from a first base station to a mobile station in accordance with a first downlink data frame time offset, wherein said first downlink data frame time offset is measured from a channel frame timing associated with the first base station; measuring a reception downlink time offset experienced at said mobile station between a first downlink transmission received from said first base station and a second downlink transmission from a second base station; communicating said measured reception downlink time offset from said mobile station to at least one of said first and second base stations; determining a second downlink data frame time offset based on said measured reception downlink time offset, wherein said second downlink data frame time offset is measured from a channel frame timing associated with the second base station, wherein said first and second downlink data frame time offsets are in increments of a predetermined number of chips; communicating said second downlink data frame time offset to said mobile station for said soft handoff operation; and transmitting data frames from said second base station to said mobile station in accordance with said second downlink data frame time offset, wherein data frames transmitted from said first and second base station carry the same data for said soft handoff operation.