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. … The S1AP protocol is defined in TS 36.413.
What is initial context setup in LTE?
The purpose of the Initial Context Setup procedure is to establish the necessary overall initial UE Context including E-RAB context, the Security Key, Handover Restriction List, UE Radio capability and UE Security Capabilities etc. The procedure uses UE-associated signalling.
What is S1 bearer?
An S1 bearer is the connection between the eNodeB and the MME/SGW. … An uplink TFT is used to map the UE uplink traffic to specific QoS parameters, with the mapping carried out at both the eNodeB and the UE. Mapping for the downlink TFT is carried out at the SGW or the PGW.
What is core network in 5G?
5G Core (5GC) is the heart of a 5G mobile network. … The core domain handles a wide variety of essential functions in the mobile network, such as connectivity and mobility management, authentication and authorization, subscriber data management and policy management, among others.
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 modify bearer request?
LTE: Modify EPS Bearer Context Request
· The purpose of the EPS bearer context modification procedure is to modify an EPS bearer context with a specific QoS and TFT. · This procedure is initiated by the network, but it may also be initiated as part of the UE requested bearer resource allocation/modification procedure.
What SDF means?
SDF(service data flow) are used to map packets to the TFT(traffic flow template) based on 5 tuples and TFT is responsible for maping packet to the respective bearer which matches the QOS of bearer and the packet.
How many types of LTE bearers are there?
Two types of Bearer exist – Dedicated bearer and Default bearer. Default bearer is established when a CPE is initially attached to LTE network while dedicated bearer is always established when there is need to provide QoS to specific service (like VoIP, video etc).