For clays, it is common for the hole to slowly enlarge with the passing of time, especially if water-base muds are being used.

而对于粘土，通常的情况是井眼随时间增加而缓慢增大，尤其当使用水基泥浆时。

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Because there is no power control in CPICH, the received common pilot signal power is possibly very low if the mobile is far from the base station, and this time the channel estimates is inaccurate.

由于公共导频信道无功率控制，有可能在接收端接收到的公共导频信号的功率很低，使得信道估计的误差变大。

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