Patent ID: 9036539
Filing Date: 2015-05-19
Classification: H04L,H04W

Abstract:
1. A method of synchronizing a femtocell base station, comprising: allowing the femtocell base station to receive a preamble signal from a macrocell base station in an orthogonal frequency division multiple access (OFDMA) communication system in which a femtocell is present at any location within a macrocell; performing a downlink synchronization of the femtocell with the received preamble signal, wherein the downlink synchronization includes matching downlink transmission start timing from the femtocell base station with the reception timing of a preamble signal having a first cyclic prefix (CP) from the macrocell base station; allowing the femtocell base station to transmit a symbol having a second CP to a terminal belonging to the femtocell, wherein the first CP and the second CP overlap within a guard interval of an OFDM symbol, and wherein the downlink synchronization is performed at least when interference between the femtocell and the macrocell occurs.