Digital Enhanced Cordless Telecommunications (DECT); Global System for Mobile Communications (GSM); Integrated Services Digital Network (ISDN); DECT Access to GSM via ISDN; Functional Capabilities and Information Flows
This European Telecommunication Standard (ETS) defines the functional capabilities and information flows for the scenarios where Global System for Mobile communications (GSM) basic services are provided via the Digital Enhanced Cordless Telecommunications System (DECT) air interface for the case that the DECT network elements are interconnected with the GSM Public Land Mobile Network (PLMN) via Integrated Services Digital Network (ISDN) interfaces. The general description of the service requirements are specified in ETS 300 787 [1]. The following core features are covered by this ETS: - outgoing calls; - emergency calls; - incoming calls; - location updating@ location cancellation; - IMSI attach/detach; - TMSI reallocation procedure (temporary identity assign); - IMSI authentication; - ciphering; - identity request. Handover@ which is another Mobility Management (MM) service@ is outside the scope of this ETS. The service is produced in three stages according to the method specified in CCITT Recommendation I.130 [6]. Stage 2 identifies the Functional Entities (FEs) involved in the service and the information flows between them. This ETS is specified according to the methodology specified in CCITT Recommendation Q.65 [7]. The purpose of the stage 2 specification is to guide and constrain the work on signalling protocols at stage 3@ while fulfilling the requirements of stage 1. Stage 1 and stage 3 are defined in separate standards. This ETS distinguishes DECT access networks from the global network. The DECT access network provides the point of attachment for the served user and ensures a transparent access to the GSM services. The global network is the GSM PLMN or network of GSM PLMNs which provides the served user with the global service specified in this ETS. The specification of information flows within the global network (e.g. between Mobile Switching Centres (MSCs)@ Home Location Register (HLR) and Visitor Location Register (VLR)) is beyond the scope of this ETS. Furthermore@ conformance to this ETS is met by conforming to the stage 3 standards which fulfil the requirements of this ETS that are relevant to the equipment for which the stage 3 standard applies. Therefore no method of testing is provided for this ETS.