US 2003/0153334 A1Published application

Channel switching method and mobile communication terminal using the same

AssigneeNEC Corporation

InventorTomoaki Hokao

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Abstract

A network station sends a switching instruction to a mobile unit. The mobile unit has two receiving sections and a transmitting section operable in two data formats. Upon receipt of the switching instruction, the first receiving section switches from a first data format to a second data format. The transmitting section sends an acknowledgment signal to the network. The first receiving section and transmitting section then attempt to switch to the second data format. The second receiving section remains in the first data format. The first receiving section then attempts to achieve synchronization. If synchronization is successful, a completion notice is sent back to the network station and the second receiving section is switched from the first data format to the second data format. If the synchronization is not successful, the second receiving section switches both the first receiving section and transmitting section back to the first data format and the first receiving section waits for a further switching instruction from the network.

Claims23

Dependent claims

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 signal from said first channel parameter to a second channel parameter when said reception data symbol signal contains said channel switching signal;
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.

5 more elements

A CDMA communication system, comprising:

a base station;
and
a mobile communication terminal comprising:
a radio section which receives a radio signal from said base station 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 base station 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 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 signal from said first channel parameter to a second channel parameter when said reception data symbol signal contains said channel switching signal;
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

8 more elements

Dependencies are inferred from the claim text.