 PCI and the number of antennas. 2 For this reason, as already discussed, the idle mode measurement procedure performed by the UE can be divided into two steps: cell search and cell measurement. Only those cells found in the search phase are subjected to the actual periodic level/quality mea- surements. If the cell search procedure was deactivated there would be no neighbour cells to measure, and consequently only the serving cell level/quality would be monitored. To control RSRP and RSRQ are measured only for the OFDM symbol where the reference signals of the first two antennas are transmitted, that is, the first and the sixth OFDM symbol of the 1 ms subframe. 2 The number of antennas of neighbours is broadcast on the serving cell BCCH; possible values are one or two antennas. Otherwise, determining the number of antennas would require decoding PBCH of the neighbour. Inter-layer Mobility Optimization how often UE searches for new intra-/inter-layer neighbour cells the so-called sIntraSearch and sNonIntraSearch parameters are used. Intra-layer cell search may be deactivated if the serving cell level is better than a broadcasted threshold. Optionally for Release 9-compliant UE and network, if both RSRP and RSRQ are better than the broadcasted threshold, the UE is allowed to stop intra-frequency cell search. The rationale is that if the UE is camping in good radio conditions - 'good' here being defined by the sIntraSearch parameters - there is no need for neighbour cell search, which potentially results in some battery savings. Even so, using a low search threshold to start intra-frequency cell search is not recommended as this may result in the UE being interfered by a much stronger intra-frequency cell without being able to reselect to it. As an example, if sIntraSearch = -70 dBm and the UE could move to another sector of the same site while still camping on the much weaker sector. This results in low SINR leading to potential connection setup and paging reception problems. For this reason intra-frequency search 