PCDP & RLC , SNDCP & LLC/RLC => Equivalent in CDMA2000 HRPD

Hi,
In GPRS, on the side of SGSN, there is SNDCP that will take the
IP packets compress its header and pass to the LLC layer. While
on the MS side, the LLC inturn gives it to RLC layer for reliable
transmission of data blocks over the air interface.
Similarly,
UTRAN and E-UTRAN have PDCP and RLC layer.
What is the equivalent of PDCP and RLC in CDMA2000 HRPD ?
In which layer does header compression take place & where
does buffering of user data take place for various other scenarios
w.r.t mobility ? Any ideas ?

Thx in advans,
Karthik Balaguru