Current LTE and WiMAX implementations are often cited in the marketplace as 4G, although they don't fully comply with the planned requirements of 1 Gbps for stationary reception and 100 Mbps for mobile. The common argument for branding LTE and WiMAX systems as 4G is that they use different frequency bands to 3G technologies; that they are based on a new radio-interface paradigm; and that the standards are not backwards compatible with 3G, while some of the standards are expected to be forwards compatible with "real" 4G technologies.