What is handover preparation?
Handover preparation is the procedure between source & target enb: from step A to B. target enb prepare radio resource for incoming UE, if admission failed it will reject. Handover execution is the procedure between source enb and UE: from B to C.
How does intra e utran handover is performed?
Intra E-UTRAN Handover is used to hand over a UE from a source eNodeB to a target eNodeB using X2 when the MME is unchanged. In the scenario described here Serving GW is also unchanged.
What is LTE handover procedure?
LTE eNBs must execute handovers both within the E-UTRAN (inter/intra-eNB) and between legacy Radio Access Technologies (RATs) such as UMTS….Handover Procedures.
| Handover Procedure | Description |
|---|---|
| Intra eNB Handover (Target) | Handover from one sector to another managed by the same eNB. The procedure for when a UE is entering the new sector. |
Who initiates handover?
1. Decision: The E-UTRAN decides to initiate the handover based on a measurement reports and notifies the serving MME. 2. Preparation: The serving MME identifies and then notifies the target MME, which begins preparation of the target resources.
What is 5G handover?
In 5G networks, an intra-system handover is used to transfer a User Equipment (UE), such as a mobile phone, from one Radio Access Network (RAN) to another. A handover may be required for reasons including load balancing, changed radio conditions, or user movement [TS 23.502, Sec. 4.9.
What is intra handover?
A special case is possible, in which the source and the target are one and the same cell and only the used channel is changed during the handover. Such a handover, in which the cell is not changed, is called intra-cell handover.
What are the types of handover in LTE?
LTE supports two types of handover: X2-based handover and S1-based handover.
What is X2 and S1 interface?
eNodeBs have two interfaces, the X2 interface permits eNodeBs to intercommunicate with each other directly, and the S1 interface permits communication with the “Packet Core”. The X2 is the interconnecting interface between two eNodeBs in LTE network and supports both Control Plane and User Plane.
What type of handover does the E-UTRA support for UES?
The E-UTRA supports two types of handover for UEs in the connected mode: S1-based and X2-based handover ( Figure 4.21 ). The X2-based handover procedure is typically used for inter-eNB handover.
What is the HeNB request prior to handover procedure?
Prior to handover procedure, the HeNB requests through an intra-node signaling with the collocated L-GW to release the LIPA PDN connection. Stefan Rommer, Catherine Mulligan, in 5G Core Networks, 2020 Handover procedures in 5GS are used to hand over a UE from a source NG-RAN node to a target NG-RAN node.
What is inter-rat handover?
• Inter-RAT Handover: Handover between networks that use different radio access technology ■ UTRAN to E-UTRAN ■ E-UTRAN to UTRAN, etc. (2) Handover Categorization 2: Whether EPC Entities are Involved or not
How does a UE perform a handover from one ENB to another?
Then, the source eNB orders the UE to perform a handover by sending a Handover Commandmessage. During the handover execution phase, the UE uses the C-RNTI that was allocated by the target eNB during the handover preparation phase. This allows the UE to access the target eNB faster.