NGMN has had a central role in the definition of operator requirements, which has contributed significantly to the overall success of LTE. In the meantime, LTE has become a true global and mainstream mobile technology, and will continue to support the customer and market needs for many years to come. While supporting the development of LTE and its evolution, NGMN has developed the 5G requirements. This is outlined by the operators, in close interaction with NGMN partners, in this White Paper. The NGMN White Paper serves as a guideline for 5G definition and design, and provides also insight into areas of further exploration by NGMN and other industry stakeholders.