What is S9 interface in LTE?
The S9 interface allows the PCRF to support LTE roaming services such as Voice over LTE. This is done be establishing S9 and Rx sessions between the Home PCRF (H-PCRF) and the Visiting PCRF (V-PCRF).
What is S1 MME interface 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.
What is S4 interface in LTE?
S4 INTERFACE S4 interface is between SGSN and SGW. As we know that LTE APNs are configured in the P-GW, so the SGSN gets the information about the APN from P-GW through S-GW. So when a UE directly switches from LTE to 3G network, SGSN will contact S-GW to establish a session.
What is an interface in LTE?
Within an LTE network, LTE Interfaces connect the various components to or within the core. Interfaces allow the MME, SGW and PGW to cooperate with other network elements (e.g. HSS or PCRF). Each one of them is built in a standard way described by 3GPP.org.
What is S7 interface in LTE?
Interface: S7
It provides transfer of QoS service and charging rules from Policy and PCRF to Policy and Charging Enforcement Function (PCEF) in PDN-GW.
What is X2 interface in LTE?
The X2 is the interconnecting interface between two eNodeBs in LTE network and supports both Control Plane and User Plane. The principle Control Plane protocol is X2-AP (X2 Application Protocol) resides on SCTP (Stream Control Transmission Protocol).
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 S11 interface?
S11 – This is the interface between the MME and S-GW in an LTE network. The interface is based on Gn/GTP-Control (GTP-C) (interface between SGSN-GGSN) with some additional functions for paging coordination, mobility compared to the legacy Gn/GTP-C (SGSN-GGSN) interface. S11 is a many-to-many interface.
What is S4 interface?
In wireless applications, the S4 interface is a 4G interface between the SGSN and SGW.
What is S5 interface in LTE?
S5 interface
It provides user plane tunnelling and tunnel management between Serving GW and PDN GW. It is used for Serving GW relocation due to UE mobility and if the Serving GW needs to connect to a non-collocated PDN GW for the required PDN connectivity.
What is S11 interface in LTE?
What is S1 and X2 handover?
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 the difference between 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 S1 and X2 handover in LTE?
What is X2 handover in LTE?
The X2 handover procedure is performed without Evolved Packet Core (EPC) involvement, i.e. preparation messages are directly exchanged between the S-eNB and T-eNB. The release of the resources at the source. side during the handover completion phase is triggered by the T-eNB.
What is S5 interface?
What is S5 and S8 interface?
S5/S8 – This is the interface between the S-GW and P-GW. In principle S5 and S8 is the same interface, the difference being that S8 is used when roaming between different operators while S5 is network internal. The S5/S8 interface is used within the Evolved Packet Core (EPC) for LTE.
Why X2 interface is used in LTE?
What is X2 handover?
How does X2 handover work 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 difference between S5 and S8 interface?
In principle S5 and S8 is the same interface, the difference being that S8 is used when roaming between different operators while S5 is network internal. The S5/S8 interface is used within the Evolved Packet Core (EPC) for LTE.
Which transport protocol is used by S5 interface?
Overview. S5/8 interface is between the SGW and PGW. It uses GTP V2 over UDP transport protocol.
What is S5 S8 interface in LTE?
What is the difference between S5 and S8 interface in LTE?
Explaining the S5/S8 Interface in LTE:
In principle S5 and S8 is the same interface, the difference being that S8 is used when roaming between different operators while S5 is network internal. The S5/S8 interface is used within the Evolved Packet Core (EPC) for LTE.
Which protocol is used in VoLTE?
With an IMS core as its foundation, VoLTE employs the Session Initiation Protocol (SIP) for registration, authentication addressing, call establishment and call termination. The Session Description Protocol (SDP) is employed for RTP media and bandwidth negotiation.