A Micro-cell is formed to include a plurality of spot-cells. Communication is executed between a micro-cell base station and a mobile terminal in the micro-cell, and between a spot-cell base station and the mobile terminal in the spot cell. The micro-cell base station and spot-cell base stations are...http://www.google.com.tw/patents/US7003301?utm_source=gb-gplus-share專利 US7003301 - Communication system, communication method and mobile terminal
