In telecommunications, 4G is the 4th generation of cellular wireless standards. It is a successor of 3G and 2G families of standards. In the year of 2009, the ITU-R organization specified the IMT-Advanced (International Mobile Telecommunications Advanced) requirements for 4G standards, setting peak speed requirements for 4G service at 100 Mbit/s for high mobility communication (such as from trains and cars) and 1 Gbit/s for low mobility communication (such as pedestrians and stationary users). The world’s first publicly available LTE service was opened in two Scandinavian capitals Stockholm (Ericsson and Nokia Siemens Networks systems) and Copenhagen (a Huawei system) on 14 December 2009.One of the main technologies for 4G and beyond is called Open Wireless Architecture (OWA), supporting numerous wireless air interfaces in an open architecture platform.
problem1. What are the core requirements that ITU define for a cellular wireless network to fulfil the requirements of a 4G standard?