What is end marker in LTE?
In LTE, the serving gateway 130 (which may serve as an anchor node during the handover) may send an end marker for each bearer to assist the reordering functions at a target base station, as described in 3GPP TS 36.300 for example.
What is end marker packet?
End Marker packet is sent per GTP-U TEID during above scenarios. The Control Plane requests the User Plane to construct and send End Marker packets by sending a Session Modification Request including FAR(s) with the new downstream F-TEID, and with the SNDEM (Send End Marker Packets) flag set. Condition/Comment.
What is the purpose of end marker?
It indicates that for which of the bearer source want to do forward handover.
What are the types of handover in LTE?
LTE supports two types of handover: X2-based handover and S1-based handover.
What is S1 handover in LTE?
LTE networks prefer using the X2 interface for performing inter eNodeB handovers. An S1 handover is a fallback for scenarios where X2 interface is not available. As the name suggests, S1 handovers take place over the S1-interface. The MME and the SGW are involved during the handover procedure.
What is X2 and S1 handover in LTE?
The X2 procedure is used to handover a UE from a source (H)eNB to a target (H)eNB for which the MME is unchanged. Two procedures are defined depending on whether the serving GW (S-GW) is relocated, see [4], [5]. The S1 procedure is used by the source eNB to initiate a handover through the S1-MME interface, see [4].
What is MME and HSS?
1.1.1 MME (Mobility Management Entity) 1.1.2 SGW (Serving Gateway) 1.1.3 PGW (Packet Data Network Gateway) 1.1.4 HSS (Home Subscriber Server)
What is S1 and X2 handover?
What is X2 AP?
X2 Application protocol (X2AP) provides control plane signalling between two eNBs in E-UTRAN (or between eNB and gNB for EN-DC) over X2 interface. X2 interface is used in UE related mobility procedures, in dual connectivity procedures and in global procedures between two eNBs (or one eNB and one gNB for EN-DC).
What is SAE in LTE?
System Architecture Evolution (SAE) and the Evolved Packet Core (EPC) System Architecture Evolution (SAE) is a new network architecture designed to simplify LTE networks and establish a flat architecture similar to other IP based communications networks.
What is X2 handover in LTE?
Intra-LTE (Intra-MME/SGW) handover using the X2 interface is used to handover a UE from a source eNodeB (S-eNB) to a target eNodeB (T-eNB) using the X2 interface when the Mobility Management Entity (MME) and Serving Gateway (SGW) are unchanged.
What is N2 handover?
N2 Handover can be Intra Frequency HO and Inter Frequency HO. Source and Target gNB can be connected two different UPFs. Re-Registration is required after Successful Handover if the Source gNB and Target gNB belong to different Tracking Area (TAC)
What is difference between X2 and S1 handover in LTE?
What is X2 AP in LTE?
Server. X2 Application protocol (X2AP) provides control plane signalling between two eNBs in E-UTRAN (or between eNB and gNB for EN-DC) over X2 interface. X2 interface is used in UE related mobility procedures, in dual connectivity procedures and in global procedures between two eNBs (or one eNB and one gNB for EN-DC).
What is PGW and SGW?
The SGW also routes incoming and outgoing IP packets for better system collaboration and serves as an anchor for the UE when it moves from one eNodeB to another. PGW is the network node that connects the EPC to external IP networks. What the PGW does is that it routes packets to and from external IP networks.
What is MME SGW and PGW?
MME stands for Mobility Management Entity, PGW stands for PDN gateway and SGW stands for Serving Gateway. The figure depicts LTE EPS architecture. In the figure, UE refers to User Equipment. It is the mobile phone device used to access the LTE network.