"The present document describes the measurements for Core Network (CN) Packet Switched (PS) domain of UMTS or combined UMTS/GSM network. TS 32.401 [1] describes Performance Management concepts and requirements. The present document is valid for all measurement types provided by an implementation of a CN PS domain of UMTS network or combined UMTS/GSM network. Only measurement types that are specific to CN PS domain of UMTS or combined UMTS/GSM network are defined within the present documents. Vendor specific measurement types used in CN PS domain of UMTS or combined UMTS/GSM networks are not covered. Instead@ these could be applied according to manufacturer's documentation. Measurements related to ""external"" technologies (such as ATM or IP) as described by ""external"" standards bodies (e.g. ITU-T or 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. RNC related measurements); - Header 2: Measurement function (e.g. soft handover measurements); - Header 3: Measurements."