3G performance may not be sufficient to meet needs of future high-performance applications like multi-media, full-motion video, and wireless teleconferencing. We need a network technology that extends 3G capacity by an order of magnitude. There are multiple standards for 3G making it difficult to roam and interoperate across networks. We need global mobility and service portability. 3G is based on primarily a wide-area concept. We need hybrid networks that utilize both wireless LAN (hot spot) concept and cell or base-station wide area network design. We need wider bandwidth. Researchers have come up with spectrally more efficient modulation schemes that can not be retrofitted into 3G infrastructure. We need all digital packet networks that utilize IP in its fullest form with converged voice and data capability.
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