Patent ID: 9571177
Date: 2017-02-14
CPC Classifications: H04B,H04W

Claim:
1. A communication method executed by a macro base station for controlling interference in a hierarchical cellular network that includes the macro base station serving a macro terminal, a micro base station serving a micro terminal, and another micro base station, the method comprising: receiving, from the macro terminal, a message requesting a ranging expansion and including prospective bias values desired by the macro terminal, in response a magnitude of first interference from the micro base station to the macro terminal exceeding a predetermined first threshold value; determining a bias value used for the ranging expansion, based on the message requesting the ranging expansion; transmitting, to the macro terminal and the micro base station, a ranging expansion message including the determined bias value, so that the macro terminal and the micro base station perform the ranging expansion; and determining, based on a message requested by the micro base station, whether to perform a first combination of a hierarchical coordinated beamforming, a coordinated silencing, and the ranging expansion, or a second combination of the ranging expansion and the hierarchical coordinated beamforming.