| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a system that improves communication quality in a down link as well as an up link, in the base station that uses a plurality of tilt beam antennas. <P>SOLUTION: The base station (figure 9) of a CDMA system comprises a plurality of tilt beam antennas (S1) for covering the same communication area (S3), and a beam tilt angle control means for changing the tilt angle of at least one tilt beam antenna among the tilt beam antennas to the value different from the tilt angle of other tilt beam antenna. In the up link, a reception level is rake-synthesized using at least two tilt beam antennas, and while in a down link, transmission is made using at least one tilt beam antenna of higher reception level. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
