US 6,473,627 B1 · Mobile communication system and mobile communication method

Abstract

A mobile communication system according to the present invention includes: a radio base station for transmitting and receiving the electromagnetic waves of a circuit switching type radio communication system and the electromagnetic waves of a packet switching type radio communication system; and a communication terminal including an antenna for transmitting and receiving the electromagnetic waves of the circuit switching type radio communication system and the electromagnetic waves of the packet switching type radio communication system, a tracking unit for directing the orientation of the antenna to an arrival direction of the electromagnetic waves, a receiver for demodulating the electromagnetic waves of the circuit switching type radio communication system and the electromagnetic waves of the packet switching type radio communication system which are received, a transmitter for modulating the contents to be transmitted into the electromagnetic waves of the circuit switching type radio communication system and the electromagnetic waves of the packet switching type radio communication system, a handset for indicating predetermined information to the exterior and receiving an instruction from the exterior, and a controller for controlling the above respective units and implementing an initial acquiring procedure from which a tracking procedure or the like is omitted when a predetermined condition is satisfied, for example, at the time of switching from the circuit switching type radio communication system to the packet switching type radio communication system. Accordingly, a period of time required when switching the radio communication systems can be reduced.

Claims15

Dependent claims

A mobile communication system, comprising:

a radio base station for transmitting and receiving the electromagnetic waves of a first radio communication system and the electromagnetic waves of a second radio communication system;
and
a communication terminal including:
an antenna for transmitting and receiving the electromagnetic waves of said first radio communication system and the electromagnetic waves of said second radio communication system;
a tracking unit for directing the orientation of said antenna to an arrival direction of the electromagnetic waves;
a receiver for demodulating the electromagnetic waves of said first radio communication system and the electromagnetic waves of said second radio communication system which are received;
a transmitter for modulating the contents to be transmitted into the electromagnetic waves of said first radio communication system and the electromagnetic waves of said second radio communication system;
a handset for indicating predetermined information to an exterior of the communication terminal and receiving an instruction from the exterior;
and
a controller for controlling the above respective units and implementing an initial acquiring procedure from which a predetermined procedure is omitted when a predetermined condition is satisfied at the time of switching from said first radio communication system to said second radio communication system.

7 more elements

A mobile communication system, comprising:

a first radio base station for transmitting and receiving the electromagnetic waves of a first radio communication system having a first reference clock;
a second radio base station for transmitting and receiving the electromagnetic waves of a second radio communication system having a second reference clock which is quasi-synchronous with said first reference clock;
and
a communication terminal including:
an antenna for transmitting and receiving the electromagnetic waves of said first radio communication system and the electromagnetic waves of said second radio communication system;
a tracking unit for directing the orientation of said antenna to an arrival direction of the electromagnetic waves;
a receiver for demodulating the electromagnetic waves of said first radio communication system and the electromagnetic waves of said second radio communication system which are received;
a transmitter for modulating the contents to be transmitted into the electromagnetic waves of said first radio communication system and the electromagnetic waves of said second radio communication system;
a handset for indicating predetermined information to an exterior of the communication terminal and receiving an instruction from the exterior;
and
a controller for controlling the above respective units and implementing an initial acquiring procedure from which a frequency correcting procedure is omitted at the time of switching from said first radio communication system to said second radio communication system.

8 more elements

Dependencies are inferred from the claim text.

Mobile communication system and mobile communication method

Life of this patent

Mobile communication system and mobile communication method

Life of this patent

Abstract

Claims15