The present document is part of a TS-family covering the 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Telecommunication management; as identified below: 32.401 52.402 32.404 32.405 32.406 32.407 32.408 32.409 32.425 32.426 32.452 32.453 28.402 The present document is part of a set of specifications, which describe the requirements and information model necessary for the standardized Operation, Administration and Maintenance (OA&M) of the Evolved Packet Core (EPC) and non-3GPP access Interworking System (TS 23.402). During the lifetime of EPC and non-3GPP access network interworking, its logical and physical configuration undergo changes of varying degrees and frequencies in order to optimize the utilization of the network resources. These changes are executed through network configuration management activities and/or network engineering, see TS 32.600. Many of the activities involved in the daily operation and future network planning of interworking require data on which to base decisions. This data refers to the load carried by the network and the grade of service offered. In order to produce this data performance measurements are executed in the NEs, which comprise the network. The data can then be transferred to an external system, e.g. an Operations System (OS) in TMN terminology, for further evaluation. Annex B of TS 32.404 helps in the definition of new performance measurements that can be submitted to 3GPP for potential adoption and inclusion in the present document. Annex B of TS 32.404 discusses a top-down performance measurement definition methodology that focuses on how the end-user of performance measurements can use the measurements.

The present document describes the measurements for EPC and non-3GPP access network interworking. TS 32.401 describes Performance Management concepts and requirements. The present document is valid for all measurement types provided by an implementation of EPC and non-3GPP access Interworking System. Only measurement types that are specific to EPC and non-3GPP access interworking are defined within the present documents. Vendor specific measurement types used in EPC and non-3GPP access Interworking System 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) are 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. measurements related to ePDG);
• Header 2: Measurement function (e.g. Tunnel establishment);
• Header 3: Measurements.

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

• References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

This annex provides the use cases for the EPC and non-3GPP access Interworking System performance measurements defined in clause 4 and clause 5.