A method, communication device, and machine-readable medium. The method includes sending a first poll from a first base station having a smart antenna system to a first user terminal. The first base station receives a first uplink response signal from the first user terminal as a result of the first...http://www.google.com.tw/patents/US6795409?utm_source=gb-gplus-share專利 US6795409 - Cooperative polling in a wireless data communication system having smart antenna processing
