If I understood your question then your query is related to Inter-Frequency handover in LTE network.
I have tested inter-frequency handover in lab setup, wherein I was using handover which supports at lease two different LTE bands and running two eNodeBs on that bands. I switched on UE and it connected to LTE core network by using first eNodeB and I start moving towards the second eNodeB by holding UE. It sends measurement report saying it is experiencing low signal power from the connected eNodeB. After receiving the measurement report, source eNodeB does the reconfiguration and ask UE to measure another frequency of different band. Afterwards the normal way to measurement reporting and handover procedure is executed.
Since neighbor of source eNodeB was running on different bands. That's why source eNodeB ask UE to measure frequency of different band. In our lab setup, there was static configuration at source eNodeB regarding target/neighbor eNodeB.
I was using the data also there was no impact on data flow because network this is just handover and switching the path (SGW to new eNodeB).
