As third generation (3G) International Mobile Telecommunication 2000 (IMT-2000) systems are being deployed, evolution of further advanced systems, known as IMT-Advanced Systems is taking place. International Mobile Telecommunications-Advanced (IMT-Advanced) systems are mobile systems that include the new capabilities of IMT that go beyond those of IMT-2000. Such systems provide access to a wide range of telecommunication services including advanced mobile services, supported by mobile and fixed networks, which are increasingly packet-based.
Source: TRAI
Radio access technologies are continuously evolving to provide higher data rates and improved spectral efficiency.