Base station apparatus and radio communication method

Abstract

Taking into account an optimal reception characteristic of a communication apparatus with variable directivity, the base station apparatus of the present invention has a communication apparatus with variable directivity positively accommodate a communication with a terminal in poor reception conditions, which makes it possible to reduce power of this terminal and reduce interference, thereby increasing the subscriber capacity in the system.

What is claimed is:  
     
         1 . A base station apparatus comprising: 
 at least one first communication means for carrying out a communication with fixed directivity;    at least one second communication means for carrying out a communication with variable directivity; and    assigning means for assigning communications to said first and second communication means according to communication conditions.    
     
     
         2 . The base station apparatus according to  claim 1 , wherein assigning means assigns a communication with small interference with other terminals to said first communication means and a communication with large interference with other terminals to said second communication means.  
     
     
         3 . The base station apparatus according to  claim 1 , further comprising rate identifying means for measuring a data rate of the reception signal, wherein said assigning means carries out assignment processing based on the data rate information from said rate identifying means.  
     
     
         4 . The base station apparatus according to  claim 3 , wherein said assigning means assigns a communication at a relatively low data rate to said first communication means and a communication at a relatively high data rate to said second communication means.  
     
     
         5 . The base station apparatus according to  claim 1 , further comprising quality measuring means for measuring the quality of the reception signal, wherein said assigning means carries out assignment processing based on the measurement result from said quality measuring means.  
     
     
         6 . The base station apparatus according to  claim 5 , wherein said assigning means assigns a communication with relatively poor quality to said second communication means.  
     
     
         7 . The base station apparatus according to  claim 1 , further comprising rate identifying means for measuring a data rate of the reception signal, wherein, when the number of terminals carrying out at a relatively high data rate is greater than the number of said second communication means, said assigning means preferentially assigns a communication with terminals located far among said terminals to said second communication means.  
     
     
         8 . The base station apparatus according to  claim 7 , further comprising: 
 quality measuring means for measuring the quality of the reception signal; and    determining means for determining said far terminals based on the measurement result from said quality measuring means.    
     
     
         9 . The base station apparatus according to  claim 1 , further comprising rate identifying means for measuring a data rate of the reception signal, wherein, when the number of terminals carrying out at a relatively high data rate is greater than the number of said second communication means, said assigning means preferentially assigns a communication with terminals carrying out communications at higher data rate among said terminals to said second communication means.  
     
     
         10 . A communication terminal apparatus carrying out a radio communication with a base station apparatus, said base station apparatus comprising: 
 at least one first communication means for carrying out a communication with fixed directivity;    at least one second communication means for carrying out a communication with variable directivity; and    assigning means for assigning communications to said first and second communication means according to communication conditions.    
     
     
         11 . A radio communication method comprising the steps of: 
 measuring a data rate of a reception signal;    assigning communications to at least one first communication means for carrying out a communication with fixed directivity based on the measured data rate information and at least one second communication means for carrying out a communication with variable directivity.    
     
     
         12 . The radio communication method according to  claim 13 , which assigns a communication at a relatively low data rate to said first communication means and a communication at a relatively high data rate to said second communication means.