Lte to nr handover

1. What is LTE handover?
2. What types of handover are supported in LTE?
3. Why there is no soft handover in LTE?
4. What is handover preparation and execution in LTE?

What is LTE handover?

Abstract: Handover in LTE occurs when a device moves from the cell coverage serving it towards another; a process where the user established session must not be interrupted due to this cell change.

What types of handover are supported in LTE?

LTE supports two types of handover: X2-based handover and S1-based handover. The X2-based procedure is the least complex handover and typically would be used when an X2 interface exists between the source eNB and the target eNB.

Why there is no soft handover in LTE?

LTE is based on OFDMA, which is fundamentally a frequency division method. This means that a UE has to actually resync to a different set of frequency subcarriers when it hands over between cells, removing the possibility for soft handover.

What is handover preparation and execution in LTE?

In an LTE system, the handover decision in the handover preparation procedure is made by the radio resource man- agement function based on the measurement report from the UE. For this, the three parameters of threshold, hysteresis, and time to trigger (ΔT) can be properly combined to build the hard handover criterion.