Patent ID: 8279801

Claim:
A radio terminal apparatus which connects a radio base station apparatus by radio, and receives a downlink sub-frame, said radio base station apparatus transmitting said downlink sub-frame to each of a plurality of sectors divided from one cell, said radio terminal apparatus comprising: a scramble code-acquiring part which obtains a scramble code for a sector to which said radio terminal apparatus belongs; and a descrambling part which descrambles a scrambling-target portion in said downlink sub-frame by using said scramble code obtained by said scramble code-acquiring part, wherein said descrambling part holds scramble codes of a plurality of predetermined patterns, and descrambles said scrambling-target portion of said downlink sub-frame transmitted from said radio base station apparatus by sequentially using said scramble codes of said plurality of patterns to obtain said scramble code for said sector to which said radio terminal apparatus belongs.