Radio communication system, base station, and communication terminal

Abstract

A base station includes a transmitter configured to transmit to a terminal a first message; a receiver configured to receive from the terminal a second message including a capability information, the capability information including information which indicates whether or not the terminal is capable of using a first frequency for either uplink or downlink communication; and a processor configured to performs communication by using the first frequency together with a second frequency when the terminal is capable of using the first frequency for the communication.

What is claimed is: 
     
         1 . A base station comprising:
 a transmitter configured to transmit to a terminal a first message;   a receiver configured to receive from the terminal a second message including a capability information, the capability information including information which indicates whether or not the terminal is capable of using a first frequency for either uplink or downlink communication; and   a processor configured to performs communication by using the first frequency together with a second frequency when the terminal is capable of using the first frequency for the communication.   
     
     
         2 . The base station according to  claim 1 , wherein the first frequency is used as an unlicensed frequency, whereas the second frequency is used as a licensed frequency. 
     
     
         3 . The base station according to  claim 1 , wherein the transmitter transmits, to the terminal, the first message for requesting capability information of the terminal. 
     
     
         4 . The base station according to  claim 1 , wherein the receiver receives, from the terminal, the second message after transmitted the first message. 
     
     
         5 . A terminal comprising:
 a receiver configured to receive from a base station a first message;   a transmitter configured to transmit to the base station a second message including a capability information to the base station, the capability information including information which indicates whether or not the terminal is capable of using a first frequency for either uplink or downlink communication; and   a processor configured to performs communication by using the first frequency together with a second frequency when the terminal is capable of using the first frequency for the communication.   
     
     
         6 . The terminal according to  claim 5 , wherein the first frequency is used as an unlicensed frequency, whereas the second frequency is used as a licensed frequency. 
     
     
         7 . The terminal according to  claim 5 , wherein the receiver receives from the base station the first message for requesting capability information of the terminal. 
     
     
         8 . The terminal according to  claim 5 , wherein the transmitter transmits to the base station the second message after received the first message. 
     
     
         9 . The terminal according to  claim 5 , wherein the transmitter transmits to the base station the second message according to the first message. 
     
     
         10 . The communication system including a base station and a terminal, the communication system comprising:
 The base station configured to:
 transmit to the terminal a first message; 
 receive from the terminal a second message including a capability information, the capability information including information which indicates whether or not the terminal is capable of using a first frequency for either uplink or downlink communication; and 
   
       performs communication by using the first frequency together with a second frequency when the terminal is capable of using the first frequency for the communication; and,
 the terminal configured to:
 receive from the base station the first message; and 
 transmit to the base station the second message.