HANDOVER IN LTE NETWORK | HANDOVER PADA JARINGAN LTE

Overview of Handover

While moving, a UE performs the handover procedure to change connection to the network. The following figure shows the schematic diagram.

In the LTE system, the handover procedure is controlled by the network (eNodeB). Therefore, the eNodeB needs to monitor the quality of the radio environment where the UE is in. To do so, the eNodeB delivers a measurement control instructing the UE to send measurement reports when the conditions specified in the measurement control are met.

• Trigger: Currently, Huawei eNodeB uses event A3 to trigger an intra-frequency handover and events A2 and A4 to trigger an inter-frequency handover.

• Handover: The eNodeB delivers the handover command to the UE. Upon reception of the handover command, the UE disconnects from the source cell and is handed over to the target cell.

Handovers in the LTE system

1. Intra-RAT handovers

Frequency relationship:

• Intra-frequency handovers

• Inter-frequency handovers

Signaling bearers:

• Intra-eNodeB handovers

• Intra-MME X2-based handovers (in case the X2 interface is configured)

• Intra-MME S1-based handovers (in case the X2 interface is not configured)

• Inter-MME S1-based handovers with data forwarding over the X2 interface (in case the X2 interface is configured)

• Inter-MME S1-based handovers with data forwarding over the S1 interface (in case the X2 interface is not configured)

2. Inter-RAT handovers

Event Definition

Source :

LTE RF Operational Parameter, by Ray Khastur - Floatway System