An apparatus and method for down-link multiple-antenna transmission in a wireless communication system is provided wherein a base station section comprises: a down-link specific physical channel unit, a second common pilot channel unit, a beam weighting unit of common pilot channels, a multiplexing and summing unit, a down-link specific physical channel weighting unit, a specific physical channel and second common pilot channel multiplexing unit, an antenna array unit, a multiple-beam weight vector set unit, up-link specific physical channels, and a feedback bit information unit; and a service cell section or mobile station section comprises: an antenna unit, a channel evaluating unit, a beam selection unit, and a beam quantizing unit. The space characteristics of the physical channels are utilized reasonably. Accordingly, a beam gain is obtained, interference is suppressed effectively, and the apparatus is easy to operate.
CROSS-REFERENCE TO RELATED APPLICATION
This utility patent application is a continuation application and claims priority of the PCT International Patent Application, serial number PCT/CN02/00087, filed on Feb. 10, 2002, which claims the priority of the Chinese patent application, serial number CN 01126301.6, filed on Jul. 20, 2001; subject matter of which are incorporated herewith by reference.
A method and apparatus for managing beam selection in a mobile station. The mobile station determines that, using a currently selected beam, the mobile station would have to transmit at too high of a power level in order to maintain a balance between a forward link path and a reverse link path. The mobile station computes a transmit power on the currently selected beam and compares the computed transmit power to a predefined threshold value. If the computed transmit power exceeds the predefined threshold value, the mobile station may switch to another beam. Otherwise, the mobile station will stay with the current beam, regardless of whether the current beam has the highest receive power.
A method is provided for controlling communications between a base station and a mobile device. The method comprises transmitting a pilot signal having at least one transmitted characteristic over a channel. A data rate control signal is received, indicating a variation between the transmitted characteristic and a corresponding actual characteristic of the pilot signal received at a remote location. The data rate control signal is modified based on a coefficient related to the bandwidth of the channel, and a transmission rate is determined based on the modified data rate control signal.
A wireless communication system, and method using multiple antennas, includes a base station that applies predetermined weight vectors to multi-user signals and transmits the multi-user signals through a plurality of transmission antennas, and a plurality of mobile stations that receive and process the multi-user signals, wherein each mobile station includes a signal reception unit that processes the multi-user signals, and a feedback signal generation unit that estimates channel characteristics, over which the multi-user signals have been transmitted, from the multi-user signals, classifies a plurality of weight vectors to be applied to the estimated channel characteristics into a plurality of sets such that vectors orthogonal to one another are classified into a single set, selects a set maximizing a transmission capacity from among the classified sets, and feeds back weight indexes of weight vectors included in the selected set and weighted channel information to the base station.
