A radio communication system comprising: first and second base station apparatuses (100-1, 100-2), each having one or more cells or sectors, or a base station apparatus having a plurality of cells or sectors and a plurality of communication units, (150-1, 150-2); and a terminal apparatus configured to perform radio communication with the first and second base station apparatuses (100-1, 100-2), or the plurality of communication units (150-1, 150-2); wherein the first base station apparatus, or a first communication unit of the plurality of communication units (150-1, 150-2) includes: a process unit configured to perform a scrambling process to first transmission data by using a common scrambling code when the first transmission data is transmitted to the terminal apparatus; and a transmission unit configured to transmit the scrambled first transmission data to the terminal apparatus, and the second base station apparatus, or a second communication unit of the plurality of communication units, (150-1, 150-2) includes: a process unit configured to perform a scrambling process to second transmission data by using a common scrambling code when the second transmission data is transmitted to the terminal apparatus; and a transmission unit configured to transmit the scrambled second transmission data to the terminal apparatus, and the terminal apparatus includes: a reception unit configured to receive the first and second transmission data and to perform a descrambling process to the first and second transmission data by using the common scrambling code. first and second base station apparatuses (100-1, 100-2), each having one or more cells or sectors, or a base station apparatus having a plurality of cells or sectors and a plurality of communication units, (150-1, 150-2); and a terminal apparatus configured to perform radio communication with the first and second base station apparatuses (100-1, 100-2), or the plurality of communication units (150-1, 150-2); wherein the first base station apparatus, or a first communication unit of the plurality of communication units (150-1, 150-2) includes: a process unit configured to perform a scrambling process to first transmission data by using a common scrambling code when the first transmission data is transmitted to the terminal apparatus; and a transmission unit configured to transmit the scrambled first transmission data to the terminal apparatus, and a process unit configured to perform a scrambling process to first transmission data by using a common scrambling code when the first transmission data is transmitted to the terminal apparatus; and a transmission unit configured to transmit the scrambled first transmission data to the terminal apparatus, and the second base station apparatus, or a second communication unit of the plurality of communication units, (150-1, 150-2) includes: a process unit configured to perform a scrambling process to second transmission data by using a common scrambling code when the second transmission data is transmitted to the terminal apparatus; and a transmission unit configured to transmit the scrambled second transmission data to the terminal apparatus, and a process unit configured to perform a scrambling process to second transmission data by using a common scrambling code when the second transmission data is transmitted to the terminal apparatus; and a transmission unit configured to transmit the scrambled second transmission data to the terminal apparatus, and the terminal apparatus includes: a reception unit configured to receive the first and second transmission data and to perform a descrambling process to the first and second transmission data by using the common scrambling code. a reception unit configured to receive the first and second transmission data and to perform a descrambling process to the first and second transmission data by using the common scrambling code.