Patent ID: 6567666
Filing Date: 2003-05-20
Classification: H04W

Abstract:
A method to be performed by a mobile device, the method comprising:receiving a first data signal from a first system that uses a first modulation scheme; receiving a second data signal from a second system that uses a second modulation scheme, the second modulation scheme being different from the first modulation scheme; receiving from a system controller modulation information identifying the modulation scheme used by the second system; performing a soft handoff between the first and second system by: using the received modulation information to select a soft handoff procedure from a plurality of soft handoff procedures including a first procedure and a second procedure; if the first procedure is selected: demodulating and decoding the first data signal while independently demodulating and decoding the second data signal; and dropping the first data signal upon determining that the second data signal is stronger than the first data signal; if the second procedure is selected: demodulating the first data signal while independently demodulating the second data signal; combining the first and second data signals and decoding the two signals together; and dropping the first data signal upon determining that the second data signal is stronger than the first data signal.