What is A6 event in LTE?
What is A6 event in LTE?
Measurement event A6 is defined as ‘Neighbour becomes offset better than SCell’ which is intended for intra-frequency measurement events on SCell’s carrier frequency i.e., event A6 compares the neighbor cell(s) and the SCell that are on the same carrier frequency (illustrated below).
What is Event A1 in LTE?
LTE Event A1 The LTE Event A1 is triggered when the serving cell becomes better than a threshold. The event is triggered when the following condition is true: MEAsserv – Hyst > Threshold. Triggering of the event is subsequently cancelled when the following condition is true: MEAsserv + Hyst < Threshold.
What is A3 offset in LTE?
Event A3 is defined as a triggering event when a neighbour cell becomes an offset better than the serving cell. The UE creates a measurement report, populates the triggering details and sends the message to the serving cell.
What is intra-frequency handover in LTE?
Intra-Frequency Handover means mobility in connected mode between two different cells, but within same LTE frequency, This topic will be assigned for Event A3 which is used for LTE Intra-Frequency handover. Hyst: hysteresis, it is defined in eNodeB and used to avoid ping-pong handover.
What are the events in LTE?
LTE Measurement Report Trigger (EVENT for Measurement Report)
| Event Type | Description |
|---|---|
| Event A2 | Serving becomes worse than threshold |
| Event A3 | Neighbour becomes offset better than serving |
| Event A4 | Neighbour becomes better than threshold |
| Event A5 | Serving becomes worse than threshold1 and neighbour becomes better than threshold2 |
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.
How does handover work in LTE?
Why soft handover is not possible 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.
How does LTE handover work?
Handover procedures are a key function of LTE eNBs. They are intended to reduce interruption time compared to the circuit-switched handover process in 2G networks. Handover within an E-UTRAN. The procedure for when a UE is leaving a cell managed by the eNB and entering a cell managed by a second eNB.
What triggers handover in LTE?
Intra-MME/SGW: Handover using S1 Interface In case when X2 interface is not available and source eNodeB and target eNodeB are part of same MME/SGW then handover is carried out through S1 interface. The S-eNB initiates the handover by sending a Handover required message over the S1-MME reference point.
What are the types of handover 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.
How are handover events used in LTE UE?
Handover Events in LTE Normally LTE UE makes radio measurement in two stages which are idle and connected states. In idle state mode the measurement is used for cell selection and cell re-selection. In connected state mode, the measurement is used for handover and redirection scenarios, of course here we mean only mobility cases.
Which is better neighbour or serving in LTE handover?
A3 : Neighbour becomes offset better than serving. It will trigger Intra-LTE handover A4 : Neighbour becomes better than threshold. A5 : Serving becomes worse than threshold1 and neighbour becomes better than threshold2. It will trigger Inter-RAT measurement events B1 : Inter RAT neighbour becomes better than threshold.
When do LTE event A5 and A3 occur?
Suppose an UE wants to perform inter frequency HO but is does not support a5 event measurement and support a3 event measurement then eNodeB can configure a3 event for inter frequency HO with intra frequency HO. LTE Event A5 is triggered when the serving cell becomes worse than threshold-1 while a neighboring cell becomes better than threshold-2.
What are the 5 LTE inter system measurement events?
The stands defines 5 intra-system and 2 inter-system measurement reporting events as described below. LTE Events A1, A2, A3, A4 and A5 are based upon either RSRP or RSRQ messages. Pls. refer LTE RSRP vs RSRQ for more details.