Soft handover refers to the intra-frequency handover, but not all intra-frequency handovers are soft handovers. If the target cell and the former cell have the intra-frequency but belong to different RNC, and there is no Iur interface between RNCs, the intra-frequency hard handover will occur. Besides, the internal code handover in the same cell is also hard handover. Inter-system hard handover consists of the handover between FDD mode and TDD mode, the handover between WCDMA system and GSM system in R99, and the handover between WCDMA and cdma2000 in R4.