"The present document describes the measurements for EPC and combined EPC/UMTS/GSM. TS 32.401 [1] describes Performance Management concepts and requirements. The present document is valid for all measurement types provided by an implementation of an EPC network and combined EPC/UMTS/GSM network. Only measurement types that are specific to EPC or combined EPC/UMTS/GSM networks are defined within the present documents. Vendor specific measurement types used in EPC and combined EPC/UMTS/GSM networks are not covered. Instead@ these could be applied according to manufacturer's documentation. Measurements related to ""external"" technologies (such as IP) as described by ""external"" standards bodies (e.g. IETF) shall only be referenced within this specification@ wherever there is a need identified for the existence of such a reference. The definition of the standard measurements is intended to result in comparability of measurement data produced in a multi-vendor network@ for those measurement types that can be standardised across all vendors' implementations. The structure of the present document is as follows: - Header 1: Network Element (e.g. MME related measurements); - Header 2: Measurement function; - Header 3: Measurements."