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ETSI TS 129 018
M00002871
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ETSI TS 129 018 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); General Packet Radio Service (GPRS); Serving GPRS Support Node (SGSN) - Visitors Location Register (VLR); Gs interface layer 3 specification (3GPP TS 29.018 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 04/01/2017
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ETSI TS 129 018 specifies or references procedures used on the Serving GPRS Support Node (SGSN) to VisitorsLocation Register (VLR) interface for interoperability between GSM circuit switched services and GSM packet dataservices.The present document specifies the layer 3 messages and procedures on the Gs interface to allow coordination betweendatabases and to relay certain messages related to GSM circuit switched services over the GPRS subsystem.
The functional split between VLR and SGSN is defined in 3GPP TS 23.060 [8]. The required procedures between VLRand SGSN are defined in detail in the present document.