l, as the name suggests is used to carry information to a UT that is in standby. The final control channel is an uplink channel. Named the Random Access Channel it is used to carry control information from a user to the WBS. It may also carry other short data packets. As already mentioned there are two dedicated channels. These are present in both uplink and downlink. The first is the Dedicated Control Channel. This is used to carry a variety of types of control information to and from the UT to enable it to operate satisfactorily within the cell. The other dedicated channel is the Dedicated Traffic Channel. In many respects this is the most important one as it carries the actual user data in both directions between the WBS and the UT. One of the future features of TD-SCDMA is the use of SMART antennas. These antennas will use the information gained about the location of the user to direct the signal for a particular user in the required direction. In this way levels of interference will be reduced, thereby ensuring that data rates can be maintained and capacity held at its maximum. However, this feature is not being incorporated in the early developments of TD-SCDMA. Fourth generation In view of the long period that it takes between the first ideas and the final roll-out of systems, the initial concepts for the fourth generation systems are being set in place. These will take many of the lessons learned from the roll-out of the third generation systems, and obviously considerably enhance the performance and add new features that are considered likely to be required. In addition to this they will take account of the developments in technology that will occur before their roll-out. 11 Short-range wireless data communications In recent years a number of new technologies have arisen that provide short-range data communications for such applications as providing a wireless local area network, or just some connectivity between a computer and a printer without the need for a wired connection. Such technologies as Bluet