[WCDMA]Active Set, Monitored Set and Detected Set

[3GPP TS 25.331]

Cells that the UE is monitoring are grouped in the UE into three mutually exclusive categories:
1. Cells, which belong to the active set. User information is sent from all these cells. In FDD, the cells in the active
set are involved in soft handover. In TDD the active set always comprises one cell only. The UE shall only
consider active set cells included in the variable CELL_INFO_LIST for measurement; i.e. active set cells not
included in the CELL_INFO_LIST shall not be considered in any event evaluation and measurement reporting.
2. Cells, which are not included in the active set, but are included in the CELL_INFO_LIST belong to the
monitored set.
3. Cells detected by the UE, which are neither in the CELL_INFO_LIST nor in the active set belong to the
detected set. Reporting of measurements of the detected set is only applicable to intra-frequency measurements made by UEs in CELL_DCH state.