Radio Communication System, Reception Device, Mobile Station Device, Transmission Device, Base Station Device, Transmission/Reception Device Control Method, and Transmission/Reception Device Control Program

Abstract

A radio communication system includes transmission/reception devices which perform communication by dynamically switching a first transmission mode and a second transmission mode having a lower quality than the first transmission mode, wherein the transmission/reception devices have a transmission mode decision means which fixes a transmission mode upon communication to the first transmission mode for a given period of time.

What is claimed is: 
     
         1 . A communication system comprising:
 a mobile station device and a base station device;   wherein
 the base station device is configured to transmit by a spatial diversity mode, control information to the mobile station device, the control information being always reported to the mobile station device by the spatial diversity mode during multiple transmission periods upon start of communication with the mobile station device; and by a spatial multiplexing mode or the spatial diversity mode with dynamical configuration, user data to the mobile station device according to the control information after the base station device completes transmission of the control information; and 
 the mobile station device is configured to receive by the spatial diversity mode, the control information from the base station device; and by the spatial multiplexing mode or the spatial diversity mode with the dynamical configuration of the base station device, the user data from the base station device. 
   
     
     
         2 . The communication system according to  claim 1 , wherein start of the communication includes restart of the communication between the base station device and the mobile station device after the communication is temporarily suspended. 
     
     
         3 . A method comprising:
 transmitting, by a base station device through a spatial diversity mode, control information to a mobile station device, the control information being always reported to the mobile station device by the spatial diversity mode during multiple transmission periods upon start of communication with the mobile station device; and   transmitting, by the base station through a spatial multiplexing mode or the spatial diversity mode with dynamical configuration, user data to the mobile station device according to the control information after the base station device completes transmission of the control information.   
     
     
         4 . The method according to  claim 3 , wherein start of the communication includes a restart of the communication between the base station device and the mobile station device after the communication is temporarily suspended. 
     
     
         5 . A computer program product comprising a readable storage medium storing program code thereon for use by a base station device, the program code comprising:
 instructions for transmitting, by a spatial diversity mode, control information to a mobile station device, the control information being always reported to the mobile station device by the spatial diversity mode during multiple transmission periods upon start of communication with the mobile station device; and   instructions for transmitting according to the control information, by a spatial multiplexing mode or the spatial diversity mode with dynamical configuration, user data to the mobile station device after the transmitter completes transmission of the control information.   
     
     
         6 . The computer program product according to  claim 5 , wherein start of the communication includes restart of communication between the base station device and the mobile station device after the communication is temporarily suspended. 
     
     
         7 . A method comprising:
 receiving, by a mobile station device through a spatial diversity mode, control information from a base station device, the control information being always transmitted from a base station device by the spatial diversity mode during multiple transmission periods upon start of communication between the mobile station device and the base station device; and   receiving, by the mobile station device through a spatial multiplexing mode or the spatial diversity mode with dynamical configuration, user data from the base station device according to the control information after the base station device completes transmission of the control information.   
     
     
         8 . The method according to  claim 7 , wherein start of the communication includes restart of communication between the base station device and the mobile station device after the communication is temporarily suspended. 
     
     
         9 . A computer program product comprising a readable storage medium storing program code thereon for use by a mobile station device comprising:
 instructions for receiving, by a spatial diversity mode, control information from the base station device, the control information being always transmitted from the base station device by the spatial diversity mode during multiple transmission periods upon start of communication between the mobile station device and the base station device; and   instructions for receiving, by a spatial diversity mode or the spatial diversity mode with dynamical configuration, user data from the base station device according to the control information after the base station device completes transmission of the control information.   
     
     
         10 . The computer program product according to  claim 9 , wherein start of the communication includes restart of communication between the base station device and the mobile station device after the communication is temporarily suspended. 
     
     
         11 . The computer program product according to  claim 9 , wherein the control information, transmitted from the base station device by the spatial diversity mode, corresponds to a transmission period in which the control information is transmitted.