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ETSI TS 129 118
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ETSI TS 129 118 Universal Mobile Telecommunications System (UMTS); LTE; Mobility Management Entity (MME) - Visitor Location Register (VLR) SGs interface specification (3GPP TS 29.118 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 04/01/2017
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Full Description
CS Fallback in the Evolved Packet System (EPS) enables the provisioning of CS-domain services (e.g. voice call, Location Services (LCS) or supplementary services) by reuse of CS infrastructure when the UE is served by E-UTRAN. Additionally, SMS delivery via the CS core network is realized without CS fallback.The present document specifies the procedures and the SGs Application Part (SGsAP) messages used on the SGsinterface between the Mobility Management Entity (MME) in the EPS and the Visitor Location Register (VLR), toallow location management coordination and to relay certain messages related to GSM circuit switched services over the EPS system.
The present document also specifies the use of Stream Control Transmission Protocol (SCTP) for the transport of SGsAP messages.
The present document is applicable to the MME in the EPS and to the VLR. The functional split between the MME and the VLR is defined in 3GPP TS 23.272 [7].