What is S1 mode in LTE?

The S1 interface connects the eNB to the EPC. It can be split into control-plane (S1-MME) and user-plane (S1-U). The S1-MME is a signaling interface which supports a set of functions and procedures between the eNB and the MME. The role of S1-U is to transport user data packets between the eNB and the S-GW.

What is S1 AP interface?

The S1 Application Protocol (S1AP) provides the control plane signalling between E-UTRAN and evolved packet core (EPC). The used interface is S1-MME which is located between eNB and MME. The services provided by the S1AP are divided to UE associated and non UE associated.

What is S1 interface in 5G?

In LTE networks, X2 and S1 interface are defined as an interfaces between RAN nodes and between RAN and Core Network. 5G is expect to operate in two modes as non -standalone and standalone mode of operation. Interface between RAN Node as X2/Xn. Interface between RAN and Core Network as S1/NG.

Where is the S1 user plane interface located?

The S1 interface is specified at the boundary between the EPC and the E-UTRAN. Figure 1 depicts the logical division of the S1 interface. From the S1 perspective, the E-UTRAN access point is an eNB, and the EPC access point is either the control plane MME logical node or the user plane S-GW logical node.

What is X2 interface?

X2 interface. A point-to-point logical interface between two eNodeBs with the E-UTRAN. It supports the exchange of signaling information between two eNodeBs and supports the forwarding of protocol data units (PDUs) to the respective tunnel endpoints. X2 Application Protocol (X2AP) Protocol used by the X2 interface.

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 is S1 setup request?

This message is sent by the eNB to transfer information for a TNL association.

What is AMF in 5G?

With the functionality of the 4G Mobility Management Entity (MME) now decomposed, the 5G Core Access and Mobility Management Function (AMF) receives all connection and session related information from the User Equipment (UE) (N1/N2) but is responsible only for handling connection and mobility management tasks.

What is xn in 5G?

The Xn control plane interface (Xn-C) is defined between two NG-RAN nodes. The transport network layer is built on SCTP on top of IP. The application layer signalling protocol is referred to as XnAP (Xn Application Protocol).

What is the function of X2 interface?

The list of functions on the X2 interface is the following: – Intra LTE-Access-System Mobility Support for ECM-CONNECTED UE: – Context transfer from source eNB to target eNB; – Control of user plane transport bearers between source eNB and target eNB; – Handover cancellation; – UE context release in source eNB.

What is the purpose of X2 interface in LTE?

Why X2 interface is used in LTE?