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.
Compressed
Mode
The startup compress mode is required to measure inter-frequency and inter-system for inter-frequency hard handover and inter-system hard handover.
- Intra-frequency neighbors can be measured simultaneously with normal transmission by UE using a RAKE receiver.
- Inter-frequency or inter-system neighbors measurements require the UE measuring on a different frequency, this has either to be done with multiple receivers in the UE or in the compressed mode.
- CM is to stop the normal transmission and reception for a certain period of time, enable the UE to measure on the other frequency.
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