Patent ID: 9628197
Date: 2017-04-18
CPC Classifications: H04B,H04L,H04W

Claim:
1. An interference reduction method in a small base station having a small cell identification information that forms a small cell that at least partially overlaps with a macro cell that is formed by a macro base station having a macro cell identification information, the interference reduction method comprising the steps of: transmitting the macro cell identification information that is used to individually identify the macro cell, to a user terminal in the small cell, wherein the macro cell identification information is transmitted by the small base station; allocating a downlink control signal for the user terminal to a radio resource unit having a different index number from that of a second radio resource unit where a downlink control signal to be transmitted from the macro base station is allocated based on, in part, the macro cell identification information; and interleaving the downlink control signal for the user terminal using an interleaving pattern that is generated based on the macro cell identification information and that is the same as an interleaving pattern used in the macro base station, wherein the small cell identification information and the macro cell identification information are different, wherein the downlink control signal for the user terminal is scrambled using a scrambling sequence that is generated based on the macro cell identification information and that is same as a scrambling sequence used in the macro base station.