scope:

This ETS is a part of the Digital European Cordless Telecommunications/Global System for Mobile Communications (DECT/GSM) interworking profile and specifies requirements needed to ensure that GSM basic services can be provided over the DECT air interface.

To enable DECT terminals to inter-work with DECT systems which are connected to the GSM infrastructure, this ETS specifies the additions to the GAP [46] on which this profile is based. The additions are based on the DECT Common Interface specification given in ETS 300 175 [36] to [43].

From the GSM side this ETS assumes interworking with GSM Public Land Mobile Network (PLMN) phase 2. Interworking with GSM Phase 1 is outside the scope of this ETS.

Interworking requirements are based upon Mobile Switching Centre (MSC) attachment for the DECT Fixed Part (FP) as the FP is using the A-interface towards the GSM MSC in the respect that the FP emulates a GSM Base Station Controller (BSC) with regards to the GSM messages which are relevant to this ETS. The complete interface used between the DECT FP and the GSM MSC is specified in ETS 300 499. Attachment via other interfaces to GSM-networks is outside the scope of this ETS.

The DECT access protocols and FP and Portable Part (PP) interworking/mappings necessary for the support of basic voice telephony service are specified in ETS 300 370 [44]. The interworking/mappings and access requirements for the support of other services of this ETS, will be included in future standards of the DECT/GSM interworking profile.

The whole set of GSM services according to GSM Phase 2 is supported unless it is explicitly stated in the following clauses of this ETS.

The DECT PP has to accept the GSM Subscriber Identification Module (SIM) as well as the DECT Authentication Module (DAM), with a GSM application. The functional separation of the DECT/GSM interworking among DECT FP and PP allows for terminal portability. All roaming scenarios based on SIM roaming as described in GSM specifications are applicable. Additionally subscribers using a SIM or DAM with GSM Application in conjunction with a DECT PP, capable of DECT GSM interworking may also roam among FPs connected to different GSM networks.

Handover among DECT radio access systems and GSM radio access systems as well as handover among DECT cells connected to different Common Control Fixed Parts (CCFPs), which are individually linked to a MSC, is outside the scope of this ETS.