MOBILE COMMUNICATIONS SYSTEM AND METHOD FOR PROVIDING MOBILE UNIT HANDOVER IN WIRELESS COMMUNICATION SYSTEMS THAT EMPLOY BEAMFORMING ANTENNAS

摘要

A method for handover a mobile unit (UE) from a first base station (BS1) to a second base station (BS2) in a wireless communication systems employing smart antenna technology. Following trigger events of a handover, the mobile station generates a physical signal sounding pulse transmitted by an isotropic antenna. The sounding pulse may consist of a common sequence of symbols or a specific sequence of symbols that uniquely identifies the mobile station. A series of sounding pulses can be sent according to a power ramping procedure until a base station has focused a communications beam toward the mobile. Receiving base stations provide feedback information upon detection of the sounding pulse allowing the mobile unit (UE) and/or base station (BS1- BS4) to form communication beams toward each other. A mapping protocol may also be utilized by the communication system.