In idle or cell_FACH mode, phenomenon of the pilot pollution is that a UE cannot firmly camp on a cell at one location because of receiving many pilot channels with similar quality (or signal strength), i.e., Ec/No (or RSCP).
The condition to determine the area has pilot pollution in idle or cell_FACH mode is that third pilot appears in the cell re-selection region.
In cell_DCH mode, phenomenon of the pilot pollution is that a UE at one location frequently changes its active set cells (active set update rate is very high) because of receiving many pilot channels with similar quality (or signal strength), i.e., Ec/No (or RSCP). It causes high signaling load in RRC and Iub interfaces and the capacity of RNC is consequently reduced.
The condition to determine the area has pilot pollution in idle or cell_FACH mode is that third pilot appears in the cell re-selection region.
In cell_DCH mode, phenomenon of the pilot pollution is that a UE at one location frequently changes its active set cells (active set update rate is very high) because of receiving many pilot channels with similar quality (or signal strength), i.e., Ec/No (or RSCP). It causes high signaling load in RRC and Iub interfaces and the capacity of RNC is consequently reduced.
Solution for Pilot Polution in the network:
Reason – no dominant cell
The reason is too many overlapping cells at an area due to poor cell planning.
Solution 1
The direct solution is to remove the cells overlapping by changing the antenna configurations or reducing pilot powers of the unwanted cells.
Solution 2
The most effective solution is to increase the pilot channel power Primary CPICH power of the desired cell.
Solution 3
For the pilot pollution in idle or cell_FACH mode, Q Offset 2sn (CPICH Ec/No) parameter of the desired cell can be increased to create a dominated cell.
The reason is too many overlapping cells at an area due to poor cell planning.
Solution 1
The direct solution is to remove the cells overlapping by changing the antenna configurations or reducing pilot powers of the unwanted cells.
Solution 2
The most effective solution is to increase the pilot channel power Primary CPICH power of the desired cell.
Solution 3
For the pilot pollution in idle or cell_FACH mode, Q Offset 2sn (CPICH Ec/No) parameter of the desired cell can be increased to create a dominated cell.