We live in the era of amobile data revolution.With themass-market expansion of smartphones,

tablets, notebooks, and laptop computers, users demand services and applications mobile

communication systems that go far beyond mere voice and telephony. The growth in dataintensive

mobile services and applications such as Web browsing, social networking, and

music and video streaming has become a driving force for development of the next generation

of wireless standards. As a result, new standards are being developed to provide the

data rates and network capacity necessary to support worldwide delivery of these types of rich

multimedia application.-We live in the era of amobile data revolution.With themass-market expansion of smartphones,

tablets, notebooks, and laptop computers, users demand services and applications　mobile

communication systems that go far beyond mere voice and telephony. The growth in dataintensive

mobile services and applications such as Web browsing, social networking, and

music and video streaming has become a driving force for development of the next generation

of wireless standards. As a result, new standards are being developed to provide the

data rates and network capacity necessary to support worldwide delivery of these types of rich

multimedia application.