Packet Switched data call in WCDMA(PS call)
This article covers packet switched call flow(PS call/Data call) between Mobile(UE) and network compatible with WCDMA standard. It covers messages exchanged between Layer 3 entities at both side. It include channels used at layer 1 to carry these messages over the air.
For further details on PHY(layer 1), MAC(layer 2),RLC(layer 2),RRC(layer 3) and various modules in these layers refer our tutorial on UMTS in tutorials section. The UMTS tutorial also covers WCDMA logical/transport/physical channels.