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4G Mobile Broadband Internet is a mobile telephone standard for wireless network operators who want to move from a second generation (3G) wireless network to a fourth-generation (4G) one. Supporting data transmission at speeds up to 2 Mbps, 4G Mobile Broadband Internet combines support for both circuit-switched data, such as speech or video, and also packet-switched data from the Internet. The standard combines time division multiple access (TDMA) with an adaptive, synchronous-mode code division multiple access (CDMA) component. 4G Mobile Broadband Internet uses duplex communication By dynamically adjusting the number of timeslots used for downlink and uplink, the system can more easily accommodate asymmetric traffic with different data rate requirements on downlink and uplink. Since it does not require paired spectrum for downlink and uplink, spectrum allocation flexibility is also increased. Also, using the same carrier frequency for uplink and downlink means that the channel condition is the same on both directions, and the base station can reduce the downlink channel information from uplink channel estimates, which is helpful to the application of beam forming techniques.