A wireless communication device for selecting cell and Radio Access Technology (RAT) in a wireless communication system, wherein the wireless communication device comprises at least two Subscriber Identity Modules (SIMs) and is in an idle operating mode, the wireless communication device is configured to:
- determine a first cell and a first RAT to camp on for a first SIM based on estimating throughput or latency of a number of RATs and cells in the wireless communication system;
- determine a second cell and a second RAT to camp on for a second SIM based on estimating throughput or latency of the number of RATs and cells in the wireless communication system;
- determine whether idle mode tasks of the first and second SIMs with the determined cells and RATs have conflicting needs;
- when the idle mode tasks of the first and second SIMs have conflicting needs,
- select a SIM for which to re-determine a cell and/or RAT to camp on;
- and
- determine a third cell and/or a third RAT for the selected SIM.