The present document provides the stage 2 description for the 3GPP system provided enablers to support group communication services using EUTRAN access. The corresponding stage 1 requirements are defined in TS 22.468 [2]. The group communication system is represented by an Application Server (GCS AS) using the 3GPP system provided enablers for transferring its application signalling and for delivering application data@ e.g. media data@ to a group of UEs either (i) over MBMS Bearer Services using the Broadcast Mode of MBMS (TS 23.246 [3]); or (ii) over EPS Bearers; or (iii) over both MBMS and EPS bearer services. The specification covers both roaming and non-roaming scenarios and also includes support for service continuity@ i.e. support for continuous reception of application data when a UE changes between reception of application data via EPS and MBMS Bearer Services. Application level interactions between the UE and the GCS Application Server are out of scope of this specification.