Patent ID: 7272125

Claim:
A mobile communication terminal communicating with a network side, comprising: a radio section which receives a radio signal from said network side via an antenna to produce a reception data signal from the received radio signal, produce a transmission signal from a transmission data signal and transmits a radio signal corresponding to said transmission signal to said network side via said antenna; a first receiving section which produces a first pilot symbol signal and a first data symbol signal from said reception data signal using a first channel parameter as a current channel parameter and determines synchronization establishment from said first pilot symbol signal; a second receiving section which produces a second pilot symbol signal and a second data symbol signal from said reception data signal using said first channel parameter as a current channel parameter and determines synchronization establishment from said second pilot symbol signal; a transmitting section which transmits said transmission data signal to said radio section based a transmission data using said first channel parameter as a current channel parameter; an integral synthesizing section which selectively combines said first data symbol signal and said second data symbol signal to produce a reception data symbol signal; a processing section which processes said reception data symbol signal, outputs said transmission data to said transmitting section, and outputs a channel switching instruction from said first channel parameter to a second channel parameter when said reception data symbol signal contains said channel switching instruction; and a control section which outputs an acknowledge as said transmission data to said processing section in response to said channel switching instruction such that said acknowledge is transmitted from said transmitting section, sets said second channel parameter to said first receiving section and said transmitting section, and receives said determining result of the synchronization establishment in each of said first and second receiving sections to determine the synchronization establishment.