Patent ID: 6415158
Filing Date: 2002-07-02
Classification: H04W,Y02D

Abstract:
A dual-function mobile phone that operates as a mobile phone during a normal operating mode and as a two-way radio during a supplemental operating mode, comprising:a receiver receiving at a frequency in a first frequency band during said normal operating mode to receive communication from another device via a base station that transmits at the frequency in said first frequency band and receiving at a frequency in a second frequency band during said supplemental operating mode to receive direct communication from another dual-function mobile phone transmitting in said second frequency band; and a transmitter transmitting at a frequency in a third frequency band during said normal operating mode to transmit communication to a base station and transmitting at a frequency in said second frequency band during said supplemental operating mode to directly communicate with another dual-function mobile phone that receives at a frequency in said second frequency band, said second frequency band being in-between said first frequency band and said third frequency band.