Communication terminal and communication system

A communication terminal comprising:

• overflow estimation means estimating a simultaneous transmission, to a base station, of uplink data and an information signal related to downlink packet data received from said base station;
• uplink communication priority means controlling transmission of said information signal;
• downlink communication priority means controlling transmission of said uplink data;
• storage means previously storing priority information indicating preference of uplink communication or downlink communication;
• and
• selection means selectively operating said uplink communication priority means or the downlink communication priority means according to the priority information stored in said storage means when said overflow estimation means estimates an overflow.

A communication system comprising a base station and a communication terminal transmitting/receiving data to/from said base station, wherein

• said base station
• has transmission/receiving means transmitting downlink packet data to said communication terminal while receiving an information signal related to said downlink packet data from said communication terminal receiving said downlink packet data, and
• said communication terminal comprises:
• overflow estimation means estimating a simultaneous transmission of uplink data and said information signal to said base station, and
• transmission signal control means controlling transmission of said information signal in response to the result of estimation of said overflow estimation means.

A communication system comprising a base station and a communication terminal transmitting/receiving data to/from said base station, wherein

• said base station
• has transmission/receiving means transmitting downlink packet data to said communication terminal while receiving an information signal related to said downlink packet data from said communication terminal receiving said downlink packet data, and
• said communication terminal comprises:
• overflow estimation means estimating a simultaneous transmission of uplink data and said information signal to said base station, and
• transmission signal control means controlling transmission of the uplink data in response to the result of estimation of said overflow estimation means.

A communication system comprising a base station and a communication terminal transmitting/receiving data to/from said base station, wherein

• said base station
• has communication system change means changing the communication system of downlink communication to an optimum communication system on the basis of a communication quality signal indicating a communication quality state received from said communication terminal, and
• said communication terminal comprises:
• overflow estimation means estimating a simultaneous transmission of uplink data and said communication quality signal to said base station, and
• transmission signal control means controlling transmission of said communication quality signal in response to the result of estimation of said overflow estimation means.

A communication system comprising a base station and a communication terminal transmitting/receiving data to/from said base station, wherein

• said base station
• has communication system change means changing the communication system of downlink communication to an optimum communication system on the basis of a communication quality signal indicating a communication quality state received from said communication terminal, and
• said communication terminal comprises:
• overflow estimation means estimating a simultaneous transmission of uplink data and said communication quality signal to said base station, and
• transmission signal control means controlling transmission of said uplink data in response to the result of estimation of said overflow estimation means.

A communication system comprising a base station and a communication terminal transmitting/receiving data to/from said base station, wherein

• said base station
• has transmission/receiving means transmitting downlink packet data to said communication terminal while receiving an information signal related to said downlink packet data from said communication terminal receiving said downlink packet data, and
• said communication terminal comprises:
• overflow estimation means estimating a simultaneous transmission of uplink data and said information signal to said base station,
• uplink communication priority means controlling transmission of said information signal,
• downlink communication priority means controlling transmission of said uplink data,
• storage means previously storing priority information indicating preference of uplink communication or downlink communication, and
• selection means selectively operating said uplink communication priority means or the downlink communication priority means according to the priority information stored in said storage means when said overflow estimation means estimates an overflow.