Digital Enhanced Cordless Telecommunications (DECT); Global System for Mobile Communications (GSM); Integrated Services Digital Network (ISDN); General Description of Service Requirements
General This European Telecommunication Standard (ETS) defines the general requirements needed for the provisioning of Global System for Mobile communications (GSM) basic services via the Digital Enhanced Cordless Telecommunications (DECT) air interface for the case that the DECT network elements are interconnected with the GSM Public Land Mobile Networks (PLMNs) via Integrated Services Digital Network (ISDN) interfaces. To enable DECT terminals to interwork with DECT systems which are connected to the GSM infrastructure via ISDN interfaces@ this ETS specifies the requirements on the network that derive from the fact that an ISDN interface is used rather than the standard A-interface. This ETS is based on the DECT/GSM interworking profile specifications ETS 300 466 [1] and ETS 300 370 [2] and on the DECT and ISDN interworking for end system configuration ETS 300 434 [3]. NOTE 1: Interconnection of GSM PLMN and DECT access network elements via interfaces other than the ISDN interface (e.g. the A-interface) is outside the scope of this ETS. This ETS and the corresponding stage 2 standard specify the requirements for: - the protocols for mobility management functions across the ISDN interface; and the DECT access network interworking/mappings for mobility management functions across the ISDN interface; and - the additions to the ISDN protocols for the support of basic telephony services as specified in ETS 300 403-1 [4]. The DECT access network interworking/mappings for DECT and ISDN interworking are specified in ETS 300 434 [3]. The DECT access protocols and Portable Part (PP) interworking/mappings necessary for the support of basic telephony services are specified in ETS 300 370 [2] and ETS 300 444 [5]. Interaction with services/supplementary services are outside the scope of this ETS. Handover among DECT cells and GSM cells as well as handover among DECT cells connected to different DECT access networks@ which are individually linked to a Mobile Switching Centre (MSC)@ is outside the scope of this ETS.