Foreword1 Scope2 References3 Definitions and abbreviations4 General Description of OSA5 The role of OSA within the VHE framework for services6 High level requirements to OSA7 Void8 Charging requirements9 Requirements on interfaces at different levels of abstractions10 Security and Privacy requirements11 Requirements for Policy Management12 Event Notification Function13 Functions offered by OSA14 Service Brokering FunctionA.1 Travel support and information serviceA.2 VoidA.3 Access to SCFs in another network14 Service Brokering Function7 Void22.1273GPPRelease 9Service requirement for the Open Services Access (OSA)Stage 1TS Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM