In response, mobile operators are investing heavily in new technologies (e.g., LTE and LTE-Advanced) and new network architectures (e.g., small cells). However, such is the speed of data growth that operators will require access to significant additional spectrum in the future to efficiently meet demand. On average, around 1000 MHz of spectrum has been identified for potential mobile broadband use under the ITU’s Radio Regulations, which are reviewed every three to four years at the World Radiocommunication Conference (WRC). The ITU predicts that the rate of data growth means an average total of 1340–1960 MHz will be required for mobile broadband by 2020.