Difference between CDMA pilot channel acquistion and tracking

Hi all,
   
    Did acquisition and tracking with pilot channel sharing the same
process in CDMA2000? the acquisition using xcorr find the coarse delay,but
how does tracking action?
    Plan to using 8x oversampling,then fed the stream to a digital matched
filter to find best one from the eight. But really have no idea with the
tracking process, do i need to using xcorr again when tracking? or pass the
eight stream to the digital matched filter to find the best one?
when using 256bit DMF, case chip by chip input, tracking will cause the
stream chosen vary frequency; case 256 size buffer,then block by block
input, tracking will introduce a certain mount of delay. How should i do.

Wish your idea and thanks a lot.

B. R.
Laron